whiterose

linux unikernel
Log | Files | Refs | README | LICENSE | git clone https://git.ne02ptzero.me/git/whiterose

commit 18d0eae30e6a4f8644d589243d7ac1d70d29203d
parent 26873acacbdbb4e4b444f5dd28dcc4853f0e8ba2
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 26 Oct 2018 09:11:43 -0700

Merge tag 'char-misc-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here is the big set of char/misc patches for 4.20-rc1.

  Loads of things here, we have new code in all of these driver
  subsystems:
   - fpga
   - stm
   - extcon
   - nvmem
   - eeprom
   - hyper-v
   - gsmi
   - coresight
   - thunderbolt
   - vmw_balloon
   - goldfish
   - soundwire
  along with lots of fixes and minor changes to other small drivers.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (245 commits)
  Documentation/security-bugs: Clarify treatment of embargoed information
  lib: Fix ia64 bootloader linkage
  MAINTAINERS: Clarify UIO vs UIOVEC maintainer
  docs/uio: fix a grammar nitpick
  docs: fpga: document programming fpgas using regions
  fpga: add devm_fpga_region_create
  fpga: bridge: add devm_fpga_bridge_create
  fpga: mgr: add devm_fpga_mgr_create
  hv_balloon: Replace spin_is_locked() with lockdep
  sgi-xp: Replace spin_is_locked() with lockdep
  eeprom: New ee1004 driver for DDR4 memory
  eeprom: at25: remove unneeded 'at25_remove'
  w1: IAD Register is yet readable trough iad sys file. Fix snprintf (%u for unsigned, count for max size).
  misc: mic: scif: remove set but not used variables 'src_dma_addr, dst_dma_addr'
  misc: mic: fix a DMA pool free failure
  platform: goldfish: pipe: Add a blank line to separate varibles and code
  platform: goldfish: pipe: Remove redundant casting
  platform: goldfish: pipe: Call misc_deregister if init fails
  platform: goldfish: pipe: Move the file-scope goldfish_pipe_dev variable into the driver state
  platform: goldfish: pipe: Move the file-scope goldfish_pipe_miscdev variable into the driver state
  ...

Diffstat:
ADocumentation/ABI/testing/configfs-stp-policy-p_sys-t | 41+++++++++++++++++++++++++++++++++++++++++
ADocumentation/ABI/testing/sysfs-bus-vmbus | 21+++++++++++++++++++++
MDocumentation/admin-guide/security-bugs.rst | 47+++++++++++++++++++++++++++++------------------
MDocumentation/devicetree/bindings/arm/coresight.txt | 120+++++++++++++++++++++++++++++++++++++++++++------------------------------------
MDocumentation/driver-api/fpga/fpga-bridge.rst | 37+++++++------------------------------
MDocumentation/driver-api/fpga/fpga-mgr.rst | 126+++++++++----------------------------------------------------------------------
ADocumentation/driver-api/fpga/fpga-programming.rst | 107+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
MDocumentation/driver-api/fpga/fpga-region.rst | 91++++++++++++++++++++++++++++++++++++++++---------------------------------------
MDocumentation/driver-api/fpga/index.rst | 2++
MDocumentation/driver-api/fpga/intro.rst | 2+-
MDocumentation/driver-api/soundwire/stream.rst | 36++++++++++++++++++++++++++++++++++++
MDocumentation/driver-api/uio-howto.rst | 4++--
MDocumentation/nvmem/nvmem.txt | 31+++++++++++++++++++++++++++++++
MDocumentation/trace/stm.rst | 38+++++++++++++++++++++++++++++---------
ADocumentation/trace/sys-t.rst | 62++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
MMAINTAINERS | 11+++++++++--
Mdrivers/android/Kconfig | 2+-
Mdrivers/android/binder.c | 489++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------
Mdrivers/android/binder_trace.h | 36+++++++++++++++++++++++++++---------
Mdrivers/extcon/extcon-intel-cht-wc.c | 60+++++++++++++++++++++++++++++-------------------------------
Mdrivers/extcon/extcon-intel-int3496.c | 12++----------
Mdrivers/extcon/extcon-max14577.c | 24+++++++-----------------
Mdrivers/extcon/extcon-max77693.c | 22++++++----------------
Mdrivers/extcon/extcon-max77843.c | 19+++++++------------
Mdrivers/extcon/extcon-max8997.c | 22++++++----------------
Mdrivers/extcon/extcon.c | 15++++-----------
Mdrivers/firmware/google/Kconfig | 32+++++++++++++-------------------
Mdrivers/firmware/google/Makefile | 2--
Ddrivers/firmware/google/coreboot_table-acpi.c | 88-------------------------------------------------------------------------------
Ddrivers/firmware/google/coreboot_table-of.c | 82-------------------------------------------------------------------------------
Mdrivers/firmware/google/coreboot_table.c | 126+++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------
Mdrivers/firmware/google/coreboot_table.h | 6------
Mdrivers/firmware/google/gsmi.c | 122+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------
Mdrivers/firmware/google/vpd.c | 2+-
Mdrivers/fpga/altera-cvp.c | 8+++-----
Mdrivers/fpga/altera-fpga2sdram.c | 8+++-----
Mdrivers/fpga/altera-freeze-bridge.c | 13+++----------
Mdrivers/fpga/altera-hps2fpga.c | 7+++----
Mdrivers/fpga/altera-pr-ip-core.c | 9++-------
Mdrivers/fpga/altera-ps-spi.c | 11+++--------
Mdrivers/fpga/dfl-afu-dma-region.c | 2+-
Mdrivers/fpga/dfl-fme-br.c | 11+++--------
Mdrivers/fpga/dfl-fme-mgr.c | 13++++---------
Mdrivers/fpga/dfl-fme-region.c | 6++----
Mdrivers/fpga/dfl.c | 6++----
Mdrivers/fpga/fpga-bridge.c | 68+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
Mdrivers/fpga/fpga-mgr.c | 64++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
Mdrivers/fpga/fpga-region.c | 65+++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
Mdrivers/fpga/ice40-spi.c | 10+++-------
Mdrivers/fpga/machxo2-spi.c | 11+++--------
Mdrivers/fpga/of-fpga-region.c | 6++----
Mdrivers/fpga/socfpga-a10.c | 5++---
Mdrivers/fpga/socfpga.c | 10+++-------
Mdrivers/fpga/ts73xx-fpga.c | 11+++--------
Mdrivers/fpga/xilinx-pr-decoupler.c | 4++--
Mdrivers/fpga/xilinx-spi.c | 12++++--------
Mdrivers/fpga/zynq-fpga.c | 5++---
Mdrivers/hv/channel.c | 300++++++++++++++++++++++++++++++++++++++++++++-----------------------------------
Mdrivers/hv/channel_mgmt.c | 54+++++++++++++++++++++++-------------------------------
Mdrivers/hv/hv.c | 15++++++++++++---
Mdrivers/hv/hv_balloon.c | 2+-
Mdrivers/hv/hv_kvp.c | 14++++++++------
Mdrivers/hv/ring_buffer.c | 1+
Mdrivers/hv/vmbus_drv.c | 118+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------
Mdrivers/hwtracing/coresight/coresight-catu.c | 6++++++
Mdrivers/hwtracing/coresight/coresight-dynamic-replicator.c | 81++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------
Mdrivers/hwtracing/coresight/coresight-etb10.c | 183+++++++++++++++++++++++++++++++++++++++++++++++--------------------------------
Mdrivers/hwtracing/coresight/coresight-etm-perf.c | 132+++++++++++++++++++++++++++++++++++++++++++------------------------------------
Mdrivers/hwtracing/coresight/coresight-etm-perf.h | 26++++++++++++++++++++++++++
Mdrivers/hwtracing/coresight/coresight-etm3x.c | 58+++++++++++++++++++++++++++++++++++++++++-----------------
Mdrivers/hwtracing/coresight/coresight-etm4x.c | 93++++++++++++++++++++++++++++++++++++++++++++++++-------------------------------
Mdrivers/hwtracing/coresight/coresight-funnel.c | 28++++++++++++++++++++++------
Mdrivers/hwtracing/coresight/coresight-priv.h | 9++++++++-
Mdrivers/hwtracing/coresight/coresight-replicator.c | 4++--
Mdrivers/hwtracing/coresight/coresight-stm.c | 4++--
Mdrivers/hwtracing/coresight/coresight-tmc-etf.c | 198+++++++++++++++++++++++++++++++++++++++++--------------------------------------
Mdrivers/hwtracing/coresight/coresight-tmc-etr.c | 385+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------
Mdrivers/hwtracing/coresight/coresight-tmc.c | 4++--
Mdrivers/hwtracing/coresight/coresight-tmc.h | 4++++
Mdrivers/hwtracing/coresight/coresight-tpiu.c | 6+++---
Mdrivers/hwtracing/coresight/coresight.c | 184+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------
Mdrivers/hwtracing/coresight/of_coresight.c | 262+++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------
Mdrivers/hwtracing/stm/Kconfig | 29+++++++++++++++++++++++++++++
Mdrivers/hwtracing/stm/Makefile | 6++++++
Mdrivers/hwtracing/stm/core.c | 292++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------
Mdrivers/hwtracing/stm/heartbeat.c | 2+-
Adrivers/hwtracing/stm/p_basic.c | 48++++++++++++++++++++++++++++++++++++++++++++++++
Adrivers/hwtracing/stm/p_sys-t.c | 382+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mdrivers/hwtracing/stm/policy.c | 147++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------
Mdrivers/hwtracing/stm/stm.h | 56++++++++++++++++++++++++++++++++++++++++++++++----------
Mdrivers/misc/ad525x_dpot-i2c.c | 2+-
Mdrivers/misc/ad525x_dpot-spi.c | 2+-
Mdrivers/misc/ad525x_dpot.c | 6+++---
Mdrivers/misc/apds990x.c | 1-
Mdrivers/misc/bh1770glc.c | 3---
Mdrivers/misc/cxl/flash.c | 4++--
Mdrivers/misc/cxl/guest.c | 2--
Mdrivers/misc/echo/echo.c | 2+-
Mdrivers/misc/eeprom/Kconfig | 11+++++++++++
Mdrivers/misc/eeprom/Makefile | 1+
Mdrivers/misc/eeprom/at25.c | 13+------------
Adrivers/misc/eeprom/ee1004.c | 281+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mdrivers/misc/eeprom/eeprom_93xx46.c | 19+++++--------------
Mdrivers/misc/genwqe/card_base.c | 1-
Mdrivers/misc/genwqe/card_ddcb.c | 1-
Mdrivers/misc/genwqe/card_utils.c | 15+++++++--------
Mdrivers/misc/kgdbts.c | 16++++++----------
Mdrivers/misc/lkdtm/usercopy.c | 2+-
Mdrivers/misc/mei/bus-fixup.c | 1-
Mdrivers/misc/mei/main.c | 4++--
Mdrivers/misc/mic/scif/scif_dma.c | 9+--------
Mdrivers/misc/mic/scif/scif_fence.c | 2+-
Mdrivers/misc/sgi-gru/grukservices.c | 4++--
Mdrivers/misc/sgi-xp/xpc_channel.c | 6+++---
Mdrivers/misc/sgi-xp/xpc_partition.c | 3+--
Mdrivers/misc/sgi-xp/xpc_sn2.c | 2+-
Mdrivers/misc/sgi-xp/xpc_uv.c | 2+-
Mdrivers/misc/sram.c | 6++----
Mdrivers/misc/vmw_balloon.c | 1802+++++++++++++++++++++++++++++++++++++++++++++++--------------------------------
Mdrivers/misc/vmw_vmci/vmci_driver.c | 2+-
Mdrivers/misc/vmw_vmci/vmci_host.c | 4----
Mdrivers/misc/vmw_vmci/vmci_resource.c | 3++-
Mdrivers/nvmem/core.c | 533+++++++++++++++++++++++++++++++++++++++++++++++++++++--------------------------
Mdrivers/nvmem/lpc18xx_eeprom.c | 7+------
Mdrivers/nvmem/mxs-ocotp.c | 4++--
Mdrivers/nvmem/sunxi_sid.c | 22++++------------------
Mdrivers/platform/goldfish/goldfish_pipe.c | 399++++++++++++++++++++++++++++++++++++++-----------------------------------------
Adrivers/platform/goldfish/goldfish_pipe_qemu.h | 98+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mdrivers/slimbus/core.c | 37+++++++++++++++++++++++++++++++++++--
Mdrivers/slimbus/qcom-ngd-ctrl.c | 34+++++++++++++++++++---------------
Mdrivers/soundwire/bus.c | 6++++++
Mdrivers/soundwire/bus.h | 4++++
Mdrivers/soundwire/intel.c | 68+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
Mdrivers/soundwire/intel_init.c | 2+-
Mdrivers/soundwire/stream.c | 488++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------
Mdrivers/thunderbolt/cap.c | 3++-
Mdrivers/thunderbolt/ctl.c | 12++++++------
Mdrivers/thunderbolt/ctl.h | 3++-
Mdrivers/thunderbolt/dma_port.c | 5+----
Mdrivers/thunderbolt/dma_port.h | 5+----
Mdrivers/thunderbolt/domain.c | 7++-----
Mdrivers/thunderbolt/eeprom.c | 5+++--
Mdrivers/thunderbolt/icm.c | 5+----
Mdrivers/thunderbolt/nhi.c | 33+++++++++++++++++----------------
Mdrivers/thunderbolt/nhi.h | 3++-
Mdrivers/thunderbolt/nhi_regs.h | 1+
Mdrivers/thunderbolt/path.c | 26+++++++++++++-------------
Mdrivers/thunderbolt/property.c | 5+----
Mdrivers/thunderbolt/switch.c | 71++++++++++++++++++++++++++++++++++++++++-------------------------------
Mdrivers/thunderbolt/tb.c | 10+++++-----
Mdrivers/thunderbolt/tb.h | 9++++++---
Mdrivers/thunderbolt/tb_msgs.h | 5+----
Mdrivers/thunderbolt/tb_regs.h | 3++-
Mdrivers/thunderbolt/xdomain.c | 5+----
Mdrivers/uio/uio.c | 35+++++++++++++++++++++++------------
Mdrivers/uio/uio_dmem_genirq.c | 3++-
Mdrivers/uio/uio_fsl_elbc_gpcm.c | 3+--
Mdrivers/uio/uio_hv_generic.c | 116++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------
Mdrivers/uio/uio_pdrv_genirq.c | 3++-
Mdrivers/vme/vme.c | 1-
Mdrivers/w1/masters/omap_hdq.c | 2++
Mdrivers/w1/slaves/w1_ds2438.c | 66++++++++++++++++++++++++++++++++++++++++++++++++++++--------------
Minclude/linux/coresight.h | 41++++++++++++++++++++++++-----------------
Minclude/linux/fpga/fpga-bridge.h | 4++++
Minclude/linux/fpga/fpga-mgr.h | 4++++
Minclude/linux/fpga/fpga-region.h | 4++++
Minclude/linux/hyperv.h | 14++++++++++++--
Minclude/linux/nvmem-consumer.h | 100+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------
Minclude/linux/nvmem-provider.h | 50+++++++++++++++++++++++++++++---------------------
Minclude/linux/soundwire/sdw.h | 12++++++++++--
Minclude/linux/string.h | 7+++++++
Minclude/linux/thunderbolt.h | 5+----
Minclude/linux/uio_driver.h | 1+
Minclude/uapi/linux/android/binder.h | 10++++++++++
Mlib/Kconfig.debug | 8++++++++
Mlib/Makefile | 3++-
Alib/memcat_p.c | 34++++++++++++++++++++++++++++++++++
Mlib/string.c | 1+
Alib/test_memcat_p.c | 115+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Msamples/mei/mei-amt-version.c | 2+-
180 files changed, 6878 insertions(+), 3351 deletions(-)

diff --git a/Documentation/ABI/testing/configfs-stp-policy-p_sys-t b/Documentation/ABI/testing/configfs-stp-policy-p_sys-t @@ -0,0 +1,41 @@ +What: /config/stp-policy/<device>:p_sys-t.<policy>/<node>/uuid +Date: June 2018 +KernelVersion: 4.19 +Description: + UUID source identifier string, RW. + Default value is randomly generated at the mkdir <node> time. + Data coming from trace sources that use this <node> will be + tagged with this UUID in the MIPI SyS-T packet stream, to + allow the decoder to discern between different sources + within the same master/channel range, and identify the + higher level decoders that may be needed for each source. + +What: /config/stp-policy/<device>:p_sys-t.<policy>/<node>/do_len +Date: June 2018 +KernelVersion: 4.19 +Description: + Include payload length in the MIPI SyS-T header, boolean. + If enabled, the SyS-T protocol encoder will include payload + length in each packet's metadata. This is normally redundant + if the underlying transport protocol supports marking message + boundaries (which STP does), so this is off by default. + +What: /config/stp-policy/<device>:p_sys-t.<policy>/<node>/ts_interval +Date: June 2018 +KernelVersion: 4.19 +Description: + Time interval in milliseconds. Include a timestamp in the + MIPI SyS-T packet metadata, if this many milliseconds have + passed since the previous packet from this source. Zero is + the default and stands for "never send the timestamp". + +What: /config/stp-policy/<device>:p_sys-t.<policy>/<node>/clocksync_interval +Date: June 2018 +KernelVersion: 4.19 +Description: + Time interval in milliseconds. Send a CLOCKSYNC packet if + this many milliseconds have passed since the previous + CLOCKSYNC packet from this source. Zero is the default and + stands for "never send the CLOCKSYNC". It makes sense to + use this option with sources that generate constant and/or + periodic data, like stm_heartbeat. diff --git a/Documentation/ABI/testing/sysfs-bus-vmbus b/Documentation/ABI/testing/sysfs-bus-vmbus @@ -0,0 +1,21 @@ +What: /sys/bus/vmbus/devices/.../driver_override +Date: August 2019 +Contact: Stephen Hemminger <sthemmin@microsoft.com> +Description: + This file allows the driver for a device to be specified which + will override standard static and dynamic ID matching. When + specified, only a driver with a name matching the value written + to driver_override will have an opportunity to bind to the + device. The override is specified by writing a string to the + driver_override file (echo uio_hv_generic > driver_override) and + may be cleared with an empty string (echo > driver_override). + This returns the device to standard matching rules binding. + Writing to driver_override does not automatically unbind the + device from its current driver or make any attempt to + automatically load the specified driver. If no driver with a + matching name is currently loaded in the kernel, the device + will not bind to any driver. This also allows devices to + opt-out of driver binding using a driver_override name such as + "none". Only a single driver may be specified in the override, + there is no support for parsing delimiters. + diff --git a/Documentation/admin-guide/security-bugs.rst b/Documentation/admin-guide/security-bugs.rst @@ -26,23 +26,34 @@ information is helpful. Any exploit code is very helpful and will not be released without consent from the reporter unless it has already been made public. -Disclosure ----------- - -The goal of the Linux kernel security team is to work with the bug -submitter to understand and fix the bug. We prefer to publish the fix as -soon as possible, but try to avoid public discussion of the bug itself -and leave that to others. - -Publishing the fix may be delayed when the bug or the fix is not yet -fully understood, the solution is not well-tested or for vendor -coordination. However, we expect these delays to be short, measurable in -days, not weeks or months. A release date is negotiated by the security -team working with the bug submitter as well as vendors. However, the -kernel security team holds the final say when setting a timeframe. The -timeframe varies from immediate (esp. if it's already publicly known bug) -to a few weeks. As a basic default policy, we expect report date to -release date to be on the order of 7 days. +Disclosure and embargoed information +------------------------------------ + +The security list is not a disclosure channel. For that, see Coordination +below. + +Once a robust fix has been developed, our preference is to release the +fix in a timely fashion, treating it no differently than any of the other +thousands of changes and fixes the Linux kernel project releases every +month. + +However, at the request of the reporter, we will postpone releasing the +fix for up to 5 business days after the date of the report or after the +embargo has lifted; whichever comes first. The only exception to that +rule is if the bug is publicly known, in which case the preference is to +release the fix as soon as it's available. + +Whilst embargoed information may be shared with trusted individuals in +order to develop a fix, such information will not be published alongside +the fix or on any other disclosure channel without the permission of the +reporter. This includes but is not limited to the original bug report +and followup discussions (if any), exploits, CVE information or the +identity of the reporter. + +In other words our only interest is in getting bugs fixed. All other +information submitted to the security list and any followup discussions +of the report are treated confidentially even after the embargo has been +lifted, in perpetuity. Coordination ------------ @@ -68,7 +79,7 @@ may delay the bug handling. If a reporter wishes to have a CVE identifier assigned ahead of public disclosure, they will need to contact the private linux-distros list, described above. When such a CVE identifier is known before a patch is provided, it is desirable to mention it in the commit -message, though. +message if the reporter agrees. Non-disclosure agreements ------------------------- diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt @@ -54,9 +54,7 @@ its hardware characteristcs. clocks the core of that coresight component. The latter clock is optional. - * port or ports: The representation of the component's port - layout using the generic DT graph presentation found in - "bindings/graph.txt". + * port or ports: see "Graph bindings for Coresight" below. * Additional required properties for System Trace Macrocells (STM): * reg: along with the physical base address and length of the register @@ -73,7 +71,7 @@ its hardware characteristcs. AMBA markee): - "arm,coresight-replicator" - * port or ports: same as above. + * port or ports: see "Graph bindings for Coresight" below. * Optional properties for ETM/PTMs: @@ -96,6 +94,20 @@ its hardware characteristcs. * interrupts : Exactly one SPI may be listed for reporting the address error +Graph bindings for Coresight +------------------------------- + +Coresight components are interconnected to create a data path for the flow of +trace data generated from the "sources" to their collection points "sink". +Each coresight component must describe the "input" and "output" connections. +The connections must be described via generic DT graph bindings as described +by the "bindings/graph.txt", where each "port" along with an "endpoint" +component represents a hardware port and the connection. + + * All output ports must be listed inside a child node named "out-ports" + * All input ports must be listed inside a child node named "in-ports". + * Port address must match the hardware port number. + Example: 1. Sinks @@ -105,10 +117,11 @@ Example: clocks = <&oscclk6a>; clock-names = "apb_pclk"; - port { - etb_in_port: endpoint@0 { - slave-mode; - remote-endpoint = <&replicator_out_port0>; + in-ports { + port { + etb_in_port: endpoint@0 { + remote-endpoint = <&replicator_out_port0>; + }; }; }; }; @@ -119,10 +132,11 @@ Example: clocks = <&oscclk6a>; clock-names = "apb_pclk"; - port { - tpiu_in_port: endpoint@0 { - slave-mode; - remote-endpoint = <&replicator_out_port1>; + in-ports { + port { + tpiu_in_port: endpoint@0 { + remote-endpoint = <&replicator_out_port1>; + }; }; }; }; @@ -133,22 +147,16 @@ Example: clocks = <&oscclk6a>; clock-names = "apb_pclk"; - ports { - #address-cells = <1>; - #size-cells = <0>; - - /* input port */ - port@0 { - reg = <0>; + in-ports { + port { etr_in_port: endpoint { - slave-mode; remote-endpoint = <&replicator2_out_port0>; }; }; + }; - /* CATU link represented by output port */ - port@1 { - reg = <1>; + out-ports { + port { etr_out_port: endpoint { remote-endpoint = <&catu_in_port>; }; @@ -163,7 +171,7 @@ Example: */ compatible = "arm,coresight-replicator"; - ports { + out-ports { #address-cells = <1>; #size-cells = <0>; @@ -181,12 +189,11 @@ Example: remote-endpoint = <&tpiu_in_port>; }; }; + }; - /* replicator input port */ - port@2 { - reg = <0>; + in-ports { + port { replicator_in_port0: endpoint { - slave-mode; remote-endpoint = <&funnel_out_port0>; }; }; @@ -199,40 +206,36 @@ Example: clocks = <&oscclk6a>; clock-names = "apb_pclk"; - ports { - #address-cells = <1>; - #size-cells = <0>; - - /* funnel output port */ - port@0 { - reg = <0>; + out-ports { + port { funnel_out_port0: endpoint { remote-endpoint = <&replicator_in_port0>; }; }; + }; - /* funnel input ports */ - port@1 { + in-ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { reg = <0>; funnel_in_port0: endpoint { - slave-mode; remote-endpoint = <&ptm0_out_port>; }; }; - port@2 { + port@1 { reg = <1>; funnel_in_port1: endpoint { - slave-mode; remote-endpoint = <&ptm1_out_port>; }; }; - port@3 { + port@2 { reg = <2>; funnel_in_port2: endpoint { - slave-mode; remote-endpoint = <&etm0_out_port>; }; }; @@ -248,9 +251,11 @@ Example: cpu = <&cpu0>; clocks = <&oscclk6a>; clock-names = "apb_pclk"; - port { - ptm0_out_port: endpoint { - remote-endpoint = <&funnel_in_port0>; + out-ports { + port { + ptm0_out_port: endpoint { + remote-endpoint = <&funnel_in_port0>; + }; }; }; }; @@ -262,9 +267,11 @@ Example: cpu = <&cpu1>; clocks = <&oscclk6a>; clock-names = "apb_pclk"; - port { - ptm1_out_port: endpoint { - remote-endpoint = <&funnel_in_port1>; + out-ports { + port { + ptm1_out_port: endpoint { + remote-endpoint = <&funnel_in_port1>; + }; }; }; }; @@ -278,9 +285,11 @@ Example: clocks = <&soc_smc50mhz>; clock-names = "apb_pclk"; - port { - stm_out_port: endpoint { - remote-endpoint = <&main_funnel_in_port2>; + out-ports { + port { + stm_out_port: endpoint { + remote-endpoint = <&main_funnel_in_port2>; + }; }; }; }; @@ -295,10 +304,11 @@ Example: clock-names = "apb_pclk"; interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>; - port { - catu_in_port: endpoint { - slave-mode; - remote-endpoint = <&etr_out_port>; + in-ports { + port { + catu_in_port: endpoint { + remote-endpoint = <&etr_out_port>; + }; }; }; }; diff --git a/Documentation/driver-api/fpga/fpga-bridge.rst b/Documentation/driver-api/fpga/fpga-bridge.rst @@ -4,6 +4,12 @@ FPGA Bridge API to implement a new FPGA bridge ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +* struct :c:type:`fpga_bridge` — The FPGA Bridge structure +* struct :c:type:`fpga_bridge_ops` — Low level Bridge driver ops +* :c:func:`devm_fpga_bridge_create()` — Allocate and init a bridge struct +* :c:func:`fpga_bridge_register()` — Register a bridge +* :c:func:`fpga_bridge_unregister()` — Unregister a bridge + .. kernel-doc:: include/linux/fpga/fpga-bridge.h :functions: fpga_bridge @@ -11,39 +17,10 @@ API to implement a new FPGA bridge :functions: fpga_bridge_ops .. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_create - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_free + :functions: devm_fpga_bridge_create .. kernel-doc:: drivers/fpga/fpga-bridge.c :functions: fpga_bridge_register .. kernel-doc:: drivers/fpga/fpga-bridge.c :functions: fpga_bridge_unregister - -API to control an FPGA bridge -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -You probably won't need these directly. FPGA regions should handle this. - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: of_fpga_bridge_get - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_get - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_put - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_get_to_list - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: of_fpga_bridge_get_to_list - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_enable - -.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: fpga_bridge_disable diff --git a/Documentation/driver-api/fpga/fpga-mgr.rst b/Documentation/driver-api/fpga/fpga-mgr.rst @@ -49,18 +49,14 @@ probe function calls fpga_mgr_register(), such as:: * them in priv */ - mgr = fpga_mgr_create(dev, "Altera SOCFPGA FPGA Manager", - &socfpga_fpga_ops, priv); + mgr = devm_fpga_mgr_create(dev, "Altera SOCFPGA FPGA Manager", + &socfpga_fpga_ops, priv); if (!mgr) return -ENOMEM; platform_set_drvdata(pdev, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int socfpga_fpga_remove(struct platform_device *pdev) @@ -102,67 +98,19 @@ The ops include a .state function which will determine the state the FPGA is in and return a code of type enum fpga_mgr_states. It doesn't result in a change in state. -How to write an image buffer to a supported FPGA ------------------------------------------------- - -Some sample code:: - - #include <linux/fpga/fpga-mgr.h> - - struct fpga_manager *mgr; - struct fpga_image_info *info; - int ret; - - /* - * Get a reference to FPGA manager. The manager is not locked, so you can - * hold onto this reference without it preventing programming. - * - * This example uses the device node of the manager. Alternatively, use - * fpga_mgr_get(dev) instead if you have the device. - */ - mgr = of_fpga_mgr_get(mgr_node); - - /* struct with information about the FPGA image to program. */ - info = fpga_image_info_alloc(dev); - - /* flags indicates whether to do full or partial reconfiguration */ - info->flags = FPGA_MGR_PARTIAL_RECONFIG; - - /* - * At this point, indicate where the image is. This is pseudo-code; you're - * going to use one of these three. - */ - if (image is in a scatter gather table) { - - info->sgt = [your scatter gather table] - - } else if (image is in a buffer) { - - info->buf = [your image buffer] - info->count = [image buffer size] - - } else if (image is in a firmware file) { - - info->firmware_name = devm_kstrdup(dev, firmware_name, GFP_KERNEL); - - } - - /* Get exclusive control of FPGA manager */ - ret = fpga_mgr_lock(mgr); - - /* Load the buffer to the FPGA */ - ret = fpga_mgr_buf_load(mgr, &info, buf, count); - - /* Release the FPGA manager */ - fpga_mgr_unlock(mgr); - fpga_mgr_put(mgr); - - /* Deallocate the image info if you're done with it */ - fpga_image_info_free(info); - API for implementing a new FPGA Manager driver ---------------------------------------------- +* ``fpga_mgr_states`` — Values for :c:member:`fpga_manager->state`. +* struct :c:type:`fpga_manager` — the FPGA manager struct +* struct :c:type:`fpga_manager_ops` — Low level FPGA manager driver ops +* :c:func:`devm_fpga_mgr_create` — Allocate and init a manager struct +* :c:func:`fpga_mgr_register` — Register an FPGA manager +* :c:func:`fpga_mgr_unregister` — Unregister an FPGA manager + +.. kernel-doc:: include/linux/fpga/fpga-mgr.h + :functions: fpga_mgr_states + .. kernel-doc:: include/linux/fpga/fpga-mgr.h :functions: fpga_manager @@ -170,56 +118,10 @@ API for implementing a new FPGA Manager driver :functions: fpga_manager_ops .. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_create - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_free + :functions: devm_fpga_mgr_create .. kernel-doc:: drivers/fpga/fpga-mgr.c :functions: fpga_mgr_register .. kernel-doc:: drivers/fpga/fpga-mgr.c :functions: fpga_mgr_unregister - -API for programming an FPGA ---------------------------- - -FPGA Manager flags - -.. kernel-doc:: include/linux/fpga/fpga-mgr.h - :doc: FPGA Manager flags - -.. kernel-doc:: include/linux/fpga/fpga-mgr.h - :functions: fpga_image_info - -.. kernel-doc:: include/linux/fpga/fpga-mgr.h - :functions: fpga_mgr_states - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_image_info_alloc - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_image_info_free - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: of_fpga_mgr_get - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_get - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_put - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_lock - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_unlock - -.. kernel-doc:: include/linux/fpga/fpga-mgr.h - :functions: fpga_mgr_states - -Note - use :c:func:`fpga_region_program_fpga()` instead of :c:func:`fpga_mgr_load()` - -.. kernel-doc:: drivers/fpga/fpga-mgr.c - :functions: fpga_mgr_load diff --git a/Documentation/driver-api/fpga/fpga-programming.rst b/Documentation/driver-api/fpga/fpga-programming.rst @@ -0,0 +1,107 @@ +In-kernel API for FPGA Programming +================================== + +Overview +-------- + +The in-kernel API for FPGA programming is a combination of APIs from +FPGA manager, bridge, and regions. The actual function used to +trigger FPGA programming is :c:func:`fpga_region_program_fpga()`. + +:c:func:`fpga_region_program_fpga()` uses functionality supplied by +the FPGA manager and bridges. It will: + + * lock the region's mutex + * lock the mutex of the region's FPGA manager + * build a list of FPGA bridges if a method has been specified to do so + * disable the bridges + * program the FPGA using info passed in :c:member:`fpga_region->info`. + * re-enable the bridges + * release the locks + +The struct fpga_image_info specifies what FPGA image to program. It is +allocated/freed by :c:func:`fpga_image_info_alloc()` and freed with +:c:func:`fpga_image_info_free()` + +How to program an FPGA using a region +------------------------------------- + +When the FPGA region driver probed, it was given a pointer to an FPGA manager +driver so it knows which manager to use. The region also either has a list of +bridges to control during programming or it has a pointer to a function that +will generate that list. Here's some sample code of what to do next:: + + #include <linux/fpga/fpga-mgr.h> + #include <linux/fpga/fpga-region.h> + + struct fpga_image_info *info; + int ret; + + /* + * First, alloc the struct with information about the FPGA image to + * program. + */ + info = fpga_image_info_alloc(dev); + if (!info) + return -ENOMEM; + + /* Set flags as needed, such as: */ + info->flags = FPGA_MGR_PARTIAL_RECONFIG; + + /* + * Indicate where the FPGA image is. This is pseudo-code; you're + * going to use one of these three. + */ + if (image is in a scatter gather table) { + + info->sgt = [your scatter gather table] + + } else if (image is in a buffer) { + + info->buf = [your image buffer] + info->count = [image buffer size] + + } else if (image is in a firmware file) { + + info->firmware_name = devm_kstrdup(dev, firmware_name, + GFP_KERNEL); + + } + + /* Add info to region and do the programming */ + region->info = info; + ret = fpga_region_program_fpga(region); + + /* Deallocate the image info if you're done with it */ + region->info = NULL; + fpga_image_info_free(info); + + if (ret) + return ret; + + /* Now enumerate whatever hardware has appeared in the FPGA. */ + +API for programming an FPGA +--------------------------- + +* :c:func:`fpga_region_program_fpga` — Program an FPGA +* :c:type:`fpga_image_info` — Specifies what FPGA image to program +* :c:func:`fpga_image_info_alloc()` — Allocate an FPGA image info struct +* :c:func:`fpga_image_info_free()` — Free an FPGA image info struct + +.. kernel-doc:: drivers/fpga/fpga-region.c + :functions: fpga_region_program_fpga + +FPGA Manager flags + +.. kernel-doc:: include/linux/fpga/fpga-mgr.h + :doc: FPGA Manager flags + +.. kernel-doc:: include/linux/fpga/fpga-mgr.h + :functions: fpga_image_info + +.. kernel-doc:: drivers/fpga/fpga-mgr.c + :functions: fpga_image_info_alloc + +.. kernel-doc:: drivers/fpga/fpga-mgr.c + :functions: fpga_image_info_free diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst @@ -34,41 +34,6 @@ fpga_image_info including: * flags indicating specifics such as whether the image is for partial reconfiguration. -How to program an FPGA using a region -------------------------------------- - -First, allocate the info struct:: - - info = fpga_image_info_alloc(dev); - if (!info) - return -ENOMEM; - -Set flags as needed, i.e.:: - - info->flags |= FPGA_MGR_PARTIAL_RECONFIG; - -Point to your FPGA image, such as:: - - info->sgt = &sgt; - -Add info to region and do the programming:: - - region->info = info; - ret = fpga_region_program_fpga(region); - -:c:func:`fpga_region_program_fpga()` operates on info passed in the -fpga_image_info (region->info). This function will attempt to: - - * lock the region's mutex - * lock the region's FPGA manager - * build a list of FPGA bridges if a method has been specified to do so - * disable the bridges - * program the FPGA - * re-enable the bridges - * release the locks - -Then you will want to enumerate whatever hardware has appeared in the FPGA. - How to add a new FPGA region ---------------------------- @@ -77,26 +42,62 @@ An example of usage can be seen in the probe function of [#f2]_. .. [#f1] ../devicetree/bindings/fpga/fpga-region.txt .. [#f2] ../../drivers/fpga/of-fpga-region.c -API to program an FPGA ----------------------- - -.. kernel-doc:: drivers/fpga/fpga-region.c - :functions: fpga_region_program_fpga - API to add a new FPGA region ---------------------------- +* struct :c:type:`fpga_region` — The FPGA region struct +* :c:func:`devm_fpga_region_create` — Allocate and init a region struct +* :c:func:`fpga_region_register` — Register an FPGA region +* :c:func:`fpga_region_unregister` — Unregister an FPGA region + +The FPGA region's probe function will need to get a reference to the FPGA +Manager it will be using to do the programming. This usually would happen +during the region's probe function. + +* :c:func:`fpga_mgr_get` — Get a reference to an FPGA manager, raise ref count +* :c:func:`of_fpga_mgr_get` — Get a reference to an FPGA manager, raise ref count, + given a device node. +* :c:func:`fpga_mgr_put` — Put an FPGA manager + +The FPGA region will need to specify which bridges to control while programming +the FPGA. The region driver can build a list of bridges during probe time +(:c:member:`fpga_region->bridge_list`) or it can have a function that creates +the list of bridges to program just before programming +(:c:member:`fpga_region->get_bridges`). The FPGA bridge framework supplies the +following APIs to handle building or tearing down that list. + +* :c:func:`fpga_bridge_get_to_list` — Get a ref of an FPGA bridge, add it to a + list +* :c:func:`of_fpga_bridge_get_to_list` — Get a ref of an FPGA bridge, add it to a + list, given a device node +* :c:func:`fpga_bridges_put` — Given a list of bridges, put them + .. kernel-doc:: include/linux/fpga/fpga-region.h :functions: fpga_region .. kernel-doc:: drivers/fpga/fpga-region.c - :functions: fpga_region_create - -.. kernel-doc:: drivers/fpga/fpga-region.c - :functions: fpga_region_free + :functions: devm_fpga_region_create .. kernel-doc:: drivers/fpga/fpga-region.c :functions: fpga_region_register .. kernel-doc:: drivers/fpga/fpga-region.c :functions: fpga_region_unregister + +.. kernel-doc:: drivers/fpga/fpga-mgr.c + :functions: fpga_mgr_get + +.. kernel-doc:: drivers/fpga/fpga-mgr.c + :functions: of_fpga_mgr_get + +.. kernel-doc:: drivers/fpga/fpga-mgr.c + :functions: fpga_mgr_put + +.. kernel-doc:: drivers/fpga/fpga-bridge.c + :functions: fpga_bridge_get_to_list + +.. kernel-doc:: drivers/fpga/fpga-bridge.c + :functions: of_fpga_bridge_get_to_list + +.. kernel-doc:: drivers/fpga/fpga-bridge.c + :functions: fpga_bridges_put diff --git a/Documentation/driver-api/fpga/index.rst b/Documentation/driver-api/fpga/index.rst @@ -11,3 +11,5 @@ FPGA Subsystem fpga-mgr fpga-bridge fpga-region + fpga-programming + diff --git a/Documentation/driver-api/fpga/intro.rst b/Documentation/driver-api/fpga/intro.rst @@ -44,7 +44,7 @@ FPGA Region ----------- If you are adding a new interface to the FPGA framework, add it on top -of an FPGA region to allow the most reuse of your interface. +of an FPGA region. The FPGA Region framework (fpga-region.c) associates managers and bridges as reconfigurable regions. A region may refer to the whole diff --git a/Documentation/driver-api/soundwire/stream.rst b/Documentation/driver-api/soundwire/stream.rst @@ -101,6 +101,34 @@ interface. :: +--------------------+ | | +----------------+ +Example 5: Stereo Stream with L and R channel is rendered by 2 Masters, each +rendering one channel, and is received by two different Slaves, each +receiving one channel. Both Masters and both Slaves are using single port. :: + + +---------------+ Clock Signal +---------------+ + | Master +----------------------------------+ Slave | + | Interface | | Interface | + | 1 | | 1 | + | | Data Signal | | + | L +----------------------------------+ L | + | (Data) | Data Direction | (Data) | + +---------------+ +-----------------------> +---------------+ + + +---------------+ Clock Signal +---------------+ + | Master +----------------------------------+ Slave | + | Interface | | Interface | + | 2 | | 2 | + | | Data Signal | | + | R +----------------------------------+ R | + | (Data) | Data Direction | (Data) | + +---------------+ +-----------------------> +---------------+ + +Note: In multi-link cases like above, to lock, one would acquire a global +lock and then go on locking bus instances. But, in this case the caller +framework(ASoC DPCM) guarantees that stream operations on a card are +always serialized. So, there is no race condition and hence no need for +global lock. + SoundWire Stream Management flow ================================ @@ -174,6 +202,7 @@ per stream. From ASoC DPCM framework, this stream state maybe linked to .startup() operation. .. code-block:: c + int sdw_alloc_stream(char * stream_name); @@ -200,6 +229,7 @@ only be invoked once by respective Master(s) and Slave(s). From ASoC DPCM framework, this stream state is linked to .hw_params() operation. .. code-block:: c + int sdw_stream_add_master(struct sdw_bus * bus, struct sdw_stream_config * stream_config, struct sdw_ports_config * ports_config, @@ -245,6 +275,7 @@ stream. From ASoC DPCM framework, this stream state is linked to .prepare() operation. .. code-block:: c + int sdw_prepare_stream(struct sdw_stream_runtime * stream); @@ -274,6 +305,7 @@ stream. From ASoC DPCM framework, this stream state is linked to .trigger() start operation. .. code-block:: c + int sdw_enable_stream(struct sdw_stream_runtime * stream); SDW_STREAM_DISABLED @@ -301,6 +333,7 @@ per stream. From ASoC DPCM framework, this stream state is linked to .trigger() stop operation. .. code-block:: c + int sdw_disable_stream(struct sdw_stream_runtime * stream); @@ -325,6 +358,7 @@ per stream. From ASoC DPCM framework, this stream state is linked to .trigger() stop operation. .. code-block:: c + int sdw_deprepare_stream(struct sdw_stream_runtime * stream); @@ -349,6 +383,7 @@ all the Master(s) and Slave(s) associated with stream. From ASoC DPCM framework, this stream state is linked to .hw_free() operation. .. code-block:: c + int sdw_stream_remove_master(struct sdw_bus * bus, struct sdw_stream_runtime * stream); int sdw_stream_remove_slave(struct sdw_slave * slave, @@ -361,6 +396,7 @@ stream assigned as part of ALLOCATED state. In .shutdown() the data structure maintaining stream state are freed up. .. code-block:: c + void sdw_release_stream(struct sdw_stream_runtime * stream); Not Supported diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst @@ -463,8 +463,8 @@ Getting information about your UIO device Information about all UIO devices is available in sysfs. The first thing you should do in your driver is check ``name`` and ``version`` to make -sure your talking to the right device and that its kernel driver has the -version you expect. +sure you're talking to the right device and that its kernel driver has +the version you expect. You should also make sure that the memory mapping you need exists and has the size you expect. diff --git a/Documentation/nvmem/nvmem.txt b/Documentation/nvmem/nvmem.txt @@ -58,6 +58,37 @@ static int qfprom_probe(struct platform_device *pdev) It is mandatory that the NVMEM provider has a regmap associated with its struct device. Failure to do would return error code from nvmem_register(). +Users of board files can define and register nvmem cells using the +nvmem_cell_table struct: + +static struct nvmem_cell_info foo_nvmem_cells[] = { + { + .name = "macaddr", + .offset = 0x7f00, + .bytes = ETH_ALEN, + } +}; + +static struct nvmem_cell_table foo_nvmem_cell_table = { + .nvmem_name = "i2c-eeprom", + .cells = foo_nvmem_cells, + .ncells = ARRAY_SIZE(foo_nvmem_cells), +}; + +nvmem_add_cell_table(&foo_nvmem_cell_table); + +Additionally it is possible to create nvmem cell lookup entries and register +them with the nvmem framework from machine code as shown in the example below: + +static struct nvmem_cell_lookup foo_nvmem_lookup = { + .nvmem_name = "i2c-eeprom", + .cell_name = "macaddr", + .dev_id = "foo_mac.0", + .con_id = "mac-address", +}; + +nvmem_add_cell_lookups(&foo_nvmem_lookup, 1); + NVMEM Consumers +++++++++++++++ diff --git a/Documentation/trace/stm.rst b/Documentation/trace/stm.rst @@ -1,3 +1,5 @@ +.. SPDX-License-Identifier: GPL-2.0 + =================== System Trace Module =================== @@ -53,12 +55,30 @@ under "user" directory from the example above and this new rule will be used for trace sources with the id string of "user/dummy". Trace sources have to open the stm class device's node and write their -trace data into its file descriptor. In order to identify themselves -to the policy, they need to do a STP_POLICY_ID_SET ioctl on this file -descriptor providing their id string. Otherwise, they will be -automatically allocated a master/channel pair upon first write to this -file descriptor according to the "default" rule of the policy, if such -exists. +trace data into its file descriptor. + +In order to find an appropriate policy node for a given trace source, +several mechanisms can be used. First, a trace source can explicitly +identify itself by calling an STP_POLICY_ID_SET ioctl on the character +device's file descriptor, providing their id string, before they write +any data there. Secondly, if they chose not to perform the explicit +identification (because you may not want to patch existing software +to do this), they can just start writing the data, at which point the +stm core will try to find a policy node with the name matching the +task's name (e.g., "syslogd") and if one exists, it will be used. +Thirdly, if the task name can't be found among the policy nodes, the +catch-all entry "default" will be used, if it exists. This entry also +needs to be created and configured by the system administrator or +whatever tools are taking care of the policy configuration. Finally, +if all the above steps failed, the write() to an stm file descriptor +will return a error (EINVAL). + +Previously, if no policy nodes were found for a trace source, the stm +class would silently fall back to allocating the first available +contiguous range of master/channels from the beginning of the device's +master/channel range. The new requirement for a policy node to exist +will help programmers and sysadmins identify gaps in configuration +and have better control over the un-identified sources. Some STM devices may allow direct mapping of the channel mmio regions to userspace for zero-copy writing. One mappable page (in terms of @@ -92,9 +112,9 @@ allocated for the device according to the policy configuration. If there's a node in the root of the policy directory that matches the stm_source device's name (for example, "console"), this node will be used to allocate master and channel numbers. If there's no such policy -node, the stm core will pick the first contiguous chunk of channels -within the first available master. Note that the node must exist -before the stm_source device is connected to its stm device. +node, the stm core will use the catch-all entry "default", if one +exists. If neither policy nodes exist, the write() to stm_source_link +will return an error. stm_console =========== diff --git a/Documentation/trace/sys-t.rst b/Documentation/trace/sys-t.rst @@ -0,0 +1,62 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +MIPI SyS-T over STP +=================== + +The MIPI SyS-T protocol driver can be used with STM class devices to +generate standardized trace stream. Aside from being a standard, it +provides better trace source identification and timestamp correlation. + +In order to use the MIPI SyS-T protocol driver with your STM device, +first, you'll need CONFIG_STM_PROTO_SYS_T. + +Now, you can select which protocol driver you want to use when you create +a policy for your STM device, by specifying it in the policy name: + +# mkdir /config/stp-policy/dummy_stm.0:p_sys-t.my-policy/ + +In other words, the policy name format is extended like this: + + <device_name>:<protocol_name>.<policy_name> + +With Intel TH, therefore it can look like "0-sth:p_sys-t.my-policy". + +If the protocol name is omitted, the STM class will chose whichever +protocol driver was loaded first. + +You can also double check that everything is working as expected by + +# cat /config/stp-policy/dummy_stm.0:p_sys-t.my-policy/protocol +p_sys-t + +Now, with the MIPI SyS-T protocol driver, each policy node in the +configfs gets a few additional attributes, which determine per-source +parameters specific to the protocol: + +# mkdir /config/stp-policy/dummy_stm.0:p_sys-t.my-policy/default +# ls /config/stp-policy/dummy_stm.0:p_sys-t.my-policy/default +channels +clocksync_interval +do_len +masters +ts_interval +uuid + +The most important one here is the "uuid", which determines the UUID +that will be used to tag all data coming from this source. It is +automatically generated when a new node is created, but it is likely +that you would want to change it. + +do_len switches on/off the additional "payload length" field in the +MIPI SyS-T message header. It is off by default as the STP already +marks message boundaries. + +ts_interval and clocksync_interval determine how much time in milliseconds +can pass before we need to include a protocol (not transport, aka STP) +timestamp in a message header or send a CLOCKSYNC packet, respectively. + +See Documentation/ABI/testing/configfs-stp-policy-p_sys-t for more +details. + +* [1] https://www.mipi.org/specifications/sys-t diff --git a/MAINTAINERS b/MAINTAINERS @@ -932,6 +932,7 @@ M: Greg Kroah-Hartman <gregkh@linuxfoundation.org> M: Arve Hjønnevåg <arve@android.com> M: Todd Kjos <tkjos@android.com> M: Martijn Coenen <maco@android.com> +M: Joel Fernandes <joel@joelfernandes.org> T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git L: devel@driverdev.osuosl.org S: Supported @@ -13757,7 +13758,7 @@ F: sound/soc/ F: include/sound/soc* SOUNDWIRE SUBSYSTEM -M: Vinod Koul <vinod.koul@intel.com> +M: Vinod Koul <vkoul@kernel.org> M: Sanyog Kale <sanyog.r.kale@intel.com> R: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> L: alsa-devel@alsa-project.org (moderated for non-subscribers) @@ -15523,13 +15524,19 @@ F: arch/x86/um/ F: fs/hostfs/ F: fs/hppfs/ +USERSPACE COPYIN/COPYOUT (UIOVEC) +M: Alexander Viro <viro@zeniv.linux.org.uk> +S: Maintained +F: lib/iov_iter.c +F: include/linux/uio.h + USERSPACE I/O (UIO) M: Greg Kroah-Hartman <gregkh@linuxfoundation.org> S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git F: Documentation/driver-api/uio-howto.rst F: drivers/uio/ -F: include/linux/uio*.h +F: include/linux/uio_driver.h UTIL-LINUX PACKAGE M: Karel Zak <kzak@redhat.com> diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig @@ -10,7 +10,7 @@ if ANDROID config ANDROID_BINDER_IPC bool "Android Binder IPC Driver" - depends on MMU + depends on MMU && !CPU_CACHE_VIVT default n ---help--- Binder is used in Android for both communication between processes, diff --git a/drivers/android/binder.c b/drivers/android/binder.c @@ -71,6 +71,7 @@ #include <linux/security.h> #include <linux/spinlock.h> #include <linux/ratelimit.h> +#include <linux/syscalls.h> #include <uapi/linux/android/binder.h> @@ -457,9 +458,8 @@ struct binder_ref { }; enum binder_deferred_state { - BINDER_DEFERRED_PUT_FILES = 0x01, - BINDER_DEFERRED_FLUSH = 0x02, - BINDER_DEFERRED_RELEASE = 0x04, + BINDER_DEFERRED_FLUSH = 0x01, + BINDER_DEFERRED_RELEASE = 0x02, }; /** @@ -480,9 +480,6 @@ enum binder_deferred_state { * (invariant after initialized) * @tsk task_struct for group_leader of process * (invariant after initialized) - * @files files_struct for process - * (protected by @files_lock) - * @files_lock mutex to protect @files * @deferred_work_node: element for binder_deferred_list * (protected by binder_deferred_lock) * @deferred_work: bitmap of deferred work to perform @@ -527,8 +524,6 @@ struct binder_proc { struct list_head waiting_threads; int pid; struct task_struct *tsk; - struct files_struct *files; - struct mutex files_lock; struct hlist_node deferred_work_node; int deferred_work; bool is_dead; @@ -611,6 +606,23 @@ struct binder_thread { bool is_dead; }; +/** + * struct binder_txn_fd_fixup - transaction fd fixup list element + * @fixup_entry: list entry + * @file: struct file to be associated with new fd + * @offset: offset in buffer data to this fixup + * + * List element for fd fixups in a transaction. Since file + * descriptors need to be allocated in the context of the + * target process, we pass each fd to be processed in this + * struct. + */ +struct binder_txn_fd_fixup { + struct list_head fixup_entry; + struct file *file; + size_t offset; +}; + struct binder_transaction { int debug_id; struct binder_work work; @@ -628,6 +640,7 @@ struct binder_transaction { long priority; long saved_priority; kuid_t sender_euid; + struct list_head fd_fixups; /** * @lock: protects @from, @to_proc, and @to_thread * @@ -822,6 +835,7 @@ static void binder_enqueue_deferred_thread_work_ilocked(struct binder_thread *thread, struct binder_work *work) { + WARN_ON(!list_empty(&thread->waiting_thread_node)); binder_enqueue_work_ilocked(work, &thread->todo); } @@ -839,6 +853,7 @@ static void binder_enqueue_thread_work_ilocked(struct binder_thread *thread, struct binder_work *work) { + WARN_ON(!list_empty(&thread->waiting_thread_node)); binder_enqueue_work_ilocked(work, &thread->todo); thread->process_todo = true; } @@ -920,66 +935,6 @@ static void binder_free_thread(struct binder_thread *thread); static void binder_free_proc(struct binder_proc *proc); static void binder_inc_node_tmpref_ilocked(struct binder_node *node); -static int task_get_unused_fd_flags(struct binder_proc *proc, int flags) -{ - unsigned long rlim_cur; - unsigned long irqs; - int ret; - - mutex_lock(&proc->files_lock); - if (proc->files == NULL) { - ret = -ESRCH; - goto err; - } - if (!lock_task_sighand(proc->tsk, &irqs)) { - ret = -EMFILE; - goto err; - } - rlim_cur = task_rlimit(proc->tsk, RLIMIT_NOFILE); - unlock_task_sighand(proc->tsk, &irqs); - - ret = __alloc_fd(proc->files, 0, rlim_cur, flags); -err: - mutex_unlock(&proc->files_lock); - return ret; -} - -/* - * copied from fd_install - */ -static void task_fd_install( - struct binder_proc *proc, unsigned int fd, struct file *file) -{ - mutex_lock(&proc->files_lock); - if (proc->files) - __fd_install(proc->files, fd, file); - mutex_unlock(&proc->files_lock); -} - -/* - * copied from sys_close - */ -static long task_close_fd(struct binder_proc *proc, unsigned int fd) -{ - int retval; - - mutex_lock(&proc->files_lock); - if (proc->files == NULL) { - retval = -ESRCH; - goto err; - } - retval = __close_fd(proc->files, fd); - /* can't restart close syscall because file table entry was cleared */ - if (unlikely(retval == -ERESTARTSYS || - retval == -ERESTARTNOINTR || - retval == -ERESTARTNOHAND || - retval == -ERESTART_RESTARTBLOCK)) - retval = -EINTR; -err: - mutex_unlock(&proc->files_lock); - return retval; -} - static bool binder_has_work_ilocked(struct binder_thread *thread, bool do_proc_work) { @@ -1270,19 +1225,12 @@ static int binder_inc_node_nilocked(struct binder_node *node, int strong, } else node->local_strong_refs++; if (!node->has_strong_ref && target_list) { + struct binder_thread *thread = container_of(target_list, + struct binder_thread, todo); binder_dequeue_work_ilocked(&node->work); - /* - * Note: this function is the only place where we queue - * directly to a thread->todo without using the - * corresponding binder_enqueue_thread_work() helper - * functions; in this case it's ok to not set the - * process_todo flag, since we know this node work will - * always be followed by other work that starts queue - * processing: in case of synchronous transactions, a - * BR_REPLY or BR_ERROR; in case of oneway - * transactions, a BR_TRANSACTION_COMPLETE. - */ - binder_enqueue_work_ilocked(&node->work, target_list); + BUG_ON(&thread->todo != target_list); + binder_enqueue_deferred_thread_work_ilocked(thread, + &node->work); } } else { if (!internal) @@ -1958,10 +1906,32 @@ static struct binder_thread *binder_get_txn_from_and_acq_inner( return NULL; } +/** + * binder_free_txn_fixups() - free unprocessed fd fixups + * @t: binder transaction for t->from + * + * If the transaction is being torn down prior to being + * processed by the target process, free all of the + * fd fixups and fput the file structs. It is safe to + * call this function after the fixups have been + * processed -- in that case, the list will be empty. + */ +static void binder_free_txn_fixups(struct binder_transaction *t) +{ + struct binder_txn_fd_fixup *fixup, *tmp; + + list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) { + fput(fixup->file); + list_del(&fixup->fixup_entry); + kfree(fixup); + } +} + static void binder_free_transaction(struct binder_transaction *t) { if (t->buffer) t->buffer->transaction = NULL; + binder_free_txn_fixups(t); kfree(t); binder_stats_deleted(BINDER_STAT_TRANSACTION); } @@ -2262,12 +2232,17 @@ static void binder_transaction_buffer_release(struct binder_proc *proc, } break; case BINDER_TYPE_FD: { - struct binder_fd_object *fp = to_binder_fd_object(hdr); - - binder_debug(BINDER_DEBUG_TRANSACTION, - " fd %d\n", fp->fd); - if (failed_at) - task_close_fd(proc, fp->fd); + /* + * No need to close the file here since user-space + * closes it for for successfully delivered + * transactions. For transactions that weren't + * delivered, the new fd was never allocated so + * there is no need to close and the fput on the + * file is done when the transaction is torn + * down. + */ + WARN_ON(failed_at && + proc->tsk == current->group_leader); } break; case BINDER_TYPE_PTR: /* @@ -2283,6 +2258,15 @@ static void binder_transaction_buffer_release(struct binder_proc *proc, size_t fd_index; binder_size_t fd_buf_size; + if (proc->tsk != current->group_leader) { + /* + * Nothing to do if running in sender context + * The fd fixups have not been applied so no + * fds need to be closed. + */ + continue; + } + fda = to_binder_fd_array_object(hdr); parent = binder_validate_ptr(buffer, fda->parent, off_start, @@ -2315,7 +2299,7 @@ static void binder_transaction_buffer_release(struct binder_proc *proc, } fd_array = (u32 *)(parent_buffer + (uintptr_t)fda->parent_offset); for (fd_index = 0; fd_index < fda->num_fds; fd_index++) - task_close_fd(proc, fd_array[fd_index]); + ksys_close(fd_array[fd_index]); } break; default: pr_err("transaction release %d bad object type %x\n", @@ -2447,17 +2431,18 @@ done: return ret; } -static int binder_translate_fd(int fd, +static int binder_translate_fd(u32 *fdp, struct binder_transaction *t, struct binder_thread *thread, struct binder_transaction *in_reply_to) { struct binder_proc *proc = thread->proc; struct binder_proc *target_proc = t->to_proc; - int target_fd; + struct binder_txn_fd_fixup *fixup; struct file *file; - int ret; + int ret = 0; bool target_allows_fd; + int fd = *fdp; if (in_reply_to) target_allows_fd = !!(in_reply_to->flags & TF_ACCEPT_FDS); @@ -2485,19 +2470,24 @@ static int binder_translate_fd(int fd, goto err_security; } - target_fd = task_get_unused_fd_flags(target_proc, O_CLOEXEC); - if (target_fd < 0) { + /* + * Add fixup record for this transaction. The allocation + * of the fd in the target needs to be done from a + * target thread. + */ + fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); + if (!fixup) { ret = -ENOMEM; - goto err_get_unused_fd; + goto err_alloc; } - task_fd_install(target_proc, target_fd, file); - trace_binder_transaction_fd(t, fd, target_fd); - binder_debug(BINDER_DEBUG_TRANSACTION, " fd %d -> %d\n", - fd, target_fd); + fixup->file = file; + fixup->offset = (uintptr_t)fdp - (uintptr_t)t->buffer->data; + trace_binder_transaction_fd_send(t, fd, fixup->offset); + list_add_tail(&fixup->fixup_entry, &t->fd_fixups); - return target_fd; + return ret; -err_get_unused_fd: +err_alloc: err_security: fput(file); err_fget: @@ -2511,8 +2501,7 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda, struct binder_thread *thread, struct binder_transaction *in_reply_to) { - binder_size_t fdi, fd_buf_size, num_installed_fds; - int target_fd; + binder_size_t fdi, fd_buf_size; uintptr_t parent_buffer; u32 *fd_array; struct binder_proc *proc = thread->proc; @@ -2544,23 +2533,12 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda, return -EINVAL; } for (fdi = 0; fdi < fda->num_fds; fdi++) { - target_fd = binder_translate_fd(fd_array[fdi], t, thread, + int ret = binder_translate_fd(&fd_array[fdi], t, thread, in_reply_to); - if (target_fd < 0) - goto err_translate_fd_failed; - fd_array[fdi] = target_fd; + if (ret < 0) + return ret; } return 0; - -err_translate_fd_failed: - /* - * Failed to allocate fd or security error, free fds - * installed so far. - */ - num_installed_fds = fdi; - for (fdi = 0; fdi < num_installed_fds; fdi++) - task_close_fd(target_proc, fd_array[fdi]); - return target_fd; } static int binder_fixup_parent(struct binder_transaction *t, @@ -2723,6 +2701,7 @@ static void binder_transaction(struct binder_proc *proc, { int ret; struct binder_transaction *t; + struct binder_work *w; struct binder_work *tcomplete; binder_size_t *offp, *off_end, *off_start; binder_size_t off_min; @@ -2864,6 +2843,29 @@ static void binder_transaction(struct binder_proc *proc, goto err_invalid_target_handle; } binder_inner_proc_lock(proc); + + w = list_first_entry_or_null(&thread->todo, + struct binder_work, entry); + if (!(tr->flags & TF_ONE_WAY) && w && + w->type == BINDER_WORK_TRANSACTION) { + /* + * Do not allow new outgoing transaction from a + * thread that has a transaction at the head of + * its todo list. Only need to check the head + * because binder_select_thread_ilocked picks a + * thread from proc->waiting_threads to enqueue + * the transaction, and nothing is queued to the + * todo list while the thread is on waiting_threads. + */ + binder_user_error("%d:%d new transaction not allowed when there is a transaction on thread todo\n", + proc->pid, thread->pid); + binder_inner_proc_unlock(proc); + return_error = BR_FAILED_REPLY; + return_error_param = -EPROTO; + return_error_line = __LINE__; + goto err_bad_todo_list; + } + if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) { struct binder_transaction *tmp; @@ -2911,6 +2913,7 @@ static void binder_transaction(struct binder_proc *proc, return_error_line = __LINE__; goto err_alloc_t_failed; } + INIT_LIST_HEAD(&t->fd_fixups); binder_stats_created(BINDER_STAT_TRANSACTION); spin_lock_init(&t->lock); @@ -3066,17 +3069,16 @@ static void binder_transaction(struct binder_proc *proc, case BINDER_TYPE_FD: { struct binder_fd_object *fp = to_binder_fd_object(hdr); - int target_fd = binder_translate_fd(fp->fd, t, thread, - in_reply_to); + int ret = binder_translate_fd(&fp->fd, t, thread, + in_reply_to); - if (target_fd < 0) { + if (ret < 0) { return_error = BR_FAILED_REPLY; - return_error_param = target_fd; + return_error_param = ret; return_error_line = __LINE__; goto err_translate_failed; } fp->pad_binder = 0; - fp->fd = target_fd; } break; case BINDER_TYPE_FDA: { struct binder_fd_array_object *fda = @@ -3233,6 +3235,7 @@ err_bad_object_type: err_bad_offset: err_bad_parent: err_copy_data_failed: + binder_free_txn_fixups(t); trace_binder_transaction_failed_buffer_release(t->buffer); binder_transaction_buffer_release(target_proc, t->buffer, offp); if (target_node) @@ -3247,6 +3250,7 @@ err_alloc_tcomplete_failed: kfree(t); binder_stats_deleted(BINDER_STAT_TRANSACTION); err_alloc_t_failed: +err_bad_todo_list: err_bad_call_stack: err_empty_call_stack: err_dead_binder: @@ -3294,6 +3298,47 @@ err_invalid_target_handle: } } +/** + * binder_free_buf() - free the specified buffer + * @proc: binder proc that owns buffer + * @buffer: buffer to be freed + * + * If buffer for an async transaction, enqueue the next async + * transaction from the node. + * + * Cleanup buffer and free it. + */ +static void +binder_free_buf(struct binder_proc *proc, struct binder_buffer *buffer) +{ + if (buffer->transaction) { + buffer->transaction->buffer = NULL; + buffer->transaction = NULL; + } + if (buffer->async_transaction && buffer->target_node) { + struct binder_node *buf_node; + struct binder_work *w; + + buf_node = buffer->target_node; + binder_node_inner_lock(buf_node); + BUG_ON(!buf_node->has_async_transaction); + BUG_ON(buf_node->proc != proc); + w = binder_dequeue_work_head_ilocked( + &buf_node->async_todo); + if (!w) { + buf_node->has_async_transaction = false; + } else { + binder_enqueue_work_ilocked( + w, &proc->todo); + binder_wakeup_proc_ilocked(proc); + } + binder_node_inner_unlock(buf_node); + } + trace_binder_transaction_buffer_release(buffer); + binder_transaction_buffer_release(proc, buffer, NULL); + binder_alloc_free_buf(&proc->alloc, buffer); +} + static int binder_thread_write(struct binder_proc *proc, struct binder_thread *thread, binder_uintptr_t binder_buffer, size_t size, @@ -3480,33 +3525,7 @@ static int binder_thread_write(struct binder_proc *proc, proc->pid, thread->pid, (u64)data_ptr, buffer->debug_id, buffer->transaction ? "active" : "finished"); - - if (buffer->transaction) { - buffer->transaction->buffer = NULL; - buffer->transaction = NULL; - } - if (buffer->async_transaction && buffer->target_node) { - struct binder_node *buf_node; - struct binder_work *w; - - buf_node = buffer->target_node; - binder_node_inner_lock(buf_node); - BUG_ON(!buf_node->has_async_transaction); - BUG_ON(buf_node->proc != proc); - w = binder_dequeue_work_head_ilocked( - &buf_node->async_todo); - if (!w) { - buf_node->has_async_transaction = false; - } else { - binder_enqueue_work_ilocked( - w, &proc->todo); - binder_wakeup_proc_ilocked(proc); - } - binder_node_inner_unlock(buf_node); - } - trace_binder_transaction_buffer_release(buffer); - binder_transaction_buffer_release(proc, buffer, NULL); - binder_alloc_free_buf(&proc->alloc, buffer); + binder_free_buf(proc, buffer); break; } @@ -3829,6 +3848,76 @@ static int binder_wait_for_work(struct binder_thread *thread, return ret; } +/** + * binder_apply_fd_fixups() - finish fd translation + * @t: binder transaction with list of fd fixups + * + * Now that we are in the context of the transaction target + * process, we can allocate and install fds. Process the + * list of fds to translate and fixup the buffer with the + * new fds. + * + * If we fail to allocate an fd, then free the resources by + * fput'ing files that have not been processed and ksys_close'ing + * any fds that have already been allocated. + */ +static int binder_apply_fd_fixups(struct binder_transaction *t) +{ + struct binder_txn_fd_fixup *fixup, *tmp; + int ret = 0; + + list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) { + int fd = get_unused_fd_flags(O_CLOEXEC); + u32 *fdp; + + if (fd < 0) { + binder_debug(BINDER_DEBUG_TRANSACTION, + "failed fd fixup txn %d fd %d\n", + t->debug_id, fd); + ret = -ENOMEM; + break; + } + binder_debug(BINDER_DEBUG_TRANSACTION, + "fd fixup txn %d fd %d\n", + t->debug_id, fd); + trace_binder_transaction_fd_recv(t, fd, fixup->offset); + fd_install(fd, fixup->file); + fixup->file = NULL; + fdp = (u32 *)(t->buffer->data + fixup->offset); + /* + * This store can cause problems for CPUs with a + * VIVT cache (eg ARMv5) since the cache cannot + * detect virtual aliases to the same physical cacheline. + * To support VIVT, this address and the user-space VA + * would both need to be flushed. Since this kernel + * VA is not constructed via page_to_virt(), we can't + * use flush_dcache_page() on it, so we'd have to use + * an internal function. If devices with VIVT ever + * need to run Android, we'll either need to go back + * to patching the translated fd from the sender side + * (using the non-standard kernel functions), or rework + * how the kernel uses the buffer to use page_to_virt() + * addresses instead of allocating in our own vm area. + * + * For now, we disable compilation if CONFIG_CPU_CACHE_VIVT. + */ + *fdp = fd; + } + list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) { + if (fixup->file) { + fput(fixup->file); + } else if (ret) { + u32 *fdp = (u32 *)(t->buffer->data + fixup->offset); + + ksys_close(*fdp); + } + list_del(&fixup->fixup_entry); + kfree(fixup); + } + + return ret; +} + static int binder_thread_read(struct binder_proc *proc, struct binder_thread *thread, binder_uintptr_t binder_buffer, size_t size, @@ -4110,6 +4199,34 @@ retry: tr.sender_pid = 0; } + ret = binder_apply_fd_fixups(t); + if (ret) { + struct binder_buffer *buffer = t->buffer; + bool oneway = !!(t->flags & TF_ONE_WAY); + int tid = t->debug_id; + + if (t_from) + binder_thread_dec_tmpref(t_from); + buffer->transaction = NULL; + binder_cleanup_transaction(t, "fd fixups failed", + BR_FAILED_REPLY); + binder_free_buf(proc, buffer); + binder_debug(BINDER_DEBUG_FAILED_TRANSACTION, + "%d:%d %stransaction %d fd fixups failed %d/%d, line %d\n", + proc->pid, thread->pid, + oneway ? "async " : + (cmd == BR_REPLY ? "reply " : ""), + tid, BR_FAILED_REPLY, ret, __LINE__); + if (cmd == BR_REPLY) { + cmd = BR_FAILED_REPLY; + if (put_user(cmd, (uint32_t __user *)ptr)) + return -EFAULT; + ptr += sizeof(uint32_t); + binder_stat_br(proc, thread, cmd); + break; + } + continue; + } tr.data_size = t->buffer->data_size; tr.offsets_size = t->buffer->offsets_size; tr.data.ptr.buffer = (binder_uintptr_t) @@ -4544,6 +4661,42 @@ out: return ret; } +static int binder_ioctl_get_node_info_for_ref(struct binder_proc *proc, + struct binder_node_info_for_ref *info) +{ + struct binder_node *node; + struct binder_context *context = proc->context; + __u32 handle = info->handle; + + if (info->strong_count || info->weak_count || info->reserved1 || + info->reserved2 || info->reserved3) { + binder_user_error("%d BINDER_GET_NODE_INFO_FOR_REF: only handle may be non-zero.", + proc->pid); + return -EINVAL; + } + + /* This ioctl may only be used by the context manager */ + mutex_lock(&context->context_mgr_node_lock); + if (!context->binder_context_mgr_node || + context->binder_context_mgr_node->proc != proc) { + mutex_unlock(&context->context_mgr_node_lock); + return -EPERM; + } + mutex_unlock(&context->context_mgr_node_lock); + + node = binder_get_node_from_ref(proc, handle, true, NULL); + if (!node) + return -EINVAL; + + info->strong_count = node->local_strong_refs + + node->internal_strong_refs; + info->weak_count = node->local_weak_refs; + + binder_put_node(node); + + return 0; +} + static int binder_ioctl_get_node_debug_info(struct binder_proc *proc, struct binder_node_debug_info *info) { @@ -4638,6 +4791,25 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) } break; } + case BINDER_GET_NODE_INFO_FOR_REF: { + struct binder_node_info_for_ref info; + + if (copy_from_user(&info, ubuf, sizeof(info))) { + ret = -EFAULT; + goto err; + } + + ret = binder_ioctl_get_node_info_for_ref(proc, &info); + if (ret < 0) + goto err; + + if (copy_to_user(ubuf, &info, sizeof(info))) { + ret = -EFAULT; + goto err; + } + + break; + } case BINDER_GET_NODE_DEBUG_INFO: { struct binder_node_debug_info info; @@ -4693,7 +4865,6 @@ static void binder_vma_close(struct vm_area_struct *vma) (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, (unsigned long)pgprot_val(vma->vm_page_prot)); binder_alloc_vma_close(&proc->alloc); - binder_defer_work(proc, BINDER_DEFERRED_PUT_FILES); } static vm_fault_t binder_vm_fault(struct vm_fault *vmf) @@ -4739,9 +4910,6 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma) ret = binder_alloc_mmap_handler(&proc->alloc, vma); if (ret) return ret; - mutex_lock(&proc->files_lock); - proc->files = get_files_struct(current); - mutex_unlock(&proc->files_lock); return 0; err_bad_arg: @@ -4765,7 +4933,6 @@ static int binder_open(struct inode *nodp, struct file *filp) spin_lock_init(&proc->outer_lock); get_task_struct(current->group_leader); proc->tsk = current->group_leader; - mutex_init(&proc->files_lock); INIT_LIST_HEAD(&proc->todo); proc->default_priority = task_nice(current); binder_dev = container_of(filp->private_data, struct binder_device, @@ -4915,8 +5082,6 @@ static void binder_deferred_release(struct binder_proc *proc) struct rb_node *n; int threads, nodes, incoming_refs, outgoing_refs, active_transactions; - BUG_ON(proc->files); - mutex_lock(&binder_procs_lock); hlist_del(&proc->proc_node); mutex_unlock(&binder_procs_lock); @@ -4998,7 +5163,6 @@ static void binder_deferred_release(struct binder_proc *proc) static void binder_deferred_func(struct work_struct *work) { struct binder_proc *proc; - struct files_struct *files; int defer; @@ -5016,23 +5180,11 @@ static void binder_deferred_func(struct work_struct *work) } mutex_unlock(&binder_deferred_lock); - files = NULL; - if (defer & BINDER_DEFERRED_PUT_FILES) { - mutex_lock(&proc->files_lock); - files = proc->files; - if (files) - proc->files = NULL; - mutex_unlock(&proc->files_lock); - } - if (defer & BINDER_DEFERRED_FLUSH) binder_deferred_flush(proc); if (defer & BINDER_DEFERRED_RELEASE) binder_deferred_release(proc); /* frees proc */ - - if (files) - put_files_struct(files); } while (proc); } static DECLARE_WORK(binder_deferred_work, binder_deferred_func); @@ -5667,12 +5819,11 @@ static int __init binder_init(void) * Copy the module_parameter string, because we don't want to * tokenize it in-place. */ - device_names = kzalloc(strlen(binder_devices_param) + 1, GFP_KERNEL); + device_names = kstrdup(binder_devices_param, GFP_KERNEL); if (!device_names) { ret = -ENOMEM; goto err_alloc_device_names_failed; } - strcpy(device_names, binder_devices_param); device_tmp = device_names; while ((device_name = strsep(&device_tmp, ","))) { diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h @@ -223,22 +223,40 @@ TRACE_EVENT(binder_transaction_ref_to_ref, __entry->dest_ref_debug_id, __entry->dest_ref_desc) ); -TRACE_EVENT(binder_transaction_fd, - TP_PROTO(struct binder_transaction *t, int src_fd, int dest_fd), - TP_ARGS(t, src_fd, dest_fd), +TRACE_EVENT(binder_transaction_fd_send, + TP_PROTO(struct binder_transaction *t, int fd, size_t offset), + TP_ARGS(t, fd, offset), TP_STRUCT__entry( __field(int, debug_id) - __field(int, src_fd) - __field(int, dest_fd) + __field(int, fd) + __field(size_t, offset) + ), + TP_fast_assign( + __entry->debug_id = t->debug_id; + __entry->fd = fd; + __entry->offset = offset; + ), + TP_printk("transaction=%d src_fd=%d offset=%zu", + __entry->debug_id, __entry->fd, __entry->offset) +); + +TRACE_EVENT(binder_transaction_fd_recv, + TP_PROTO(struct binder_transaction *t, int fd, size_t offset), + TP_ARGS(t, fd, offset), + + TP_STRUCT__entry( + __field(int, debug_id) + __field(int, fd) + __field(size_t, offset) ), TP_fast_assign( __entry->debug_id = t->debug_id; - __entry->src_fd = src_fd; - __entry->dest_fd = dest_fd; + __entry->fd = fd; + __entry->offset = offset; ), - TP_printk("transaction=%d src_fd=%d ==> dest_fd=%d", - __entry->debug_id, __entry->src_fd, __entry->dest_fd) + TP_printk("transaction=%d dest_fd=%d offset=%zu", + __entry->debug_id, __entry->fd, __entry->offset) ); DECLARE_EVENT_CLASS(binder_buffer_class, diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c @@ -1,18 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Extcon charger detection driver for Intel Cherrytrail Whiskey Cove PMIC * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com> * * Based on various non upstream patches to support the CHT Whiskey Cove PMIC: * Copyright (C) 2013-2015 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. */ #include <linux/extcon-provider.h> @@ -32,10 +24,10 @@ #define CHT_WC_CHGRCTRL0_EMRGCHREN BIT(1) #define CHT_WC_CHGRCTRL0_EXTCHRDIS BIT(2) #define CHT_WC_CHGRCTRL0_SWCONTROL BIT(3) -#define CHT_WC_CHGRCTRL0_TTLCK_MASK BIT(4) -#define CHT_WC_CHGRCTRL0_CCSM_OFF_MASK BIT(5) -#define CHT_WC_CHGRCTRL0_DBPOFF_MASK BIT(6) -#define CHT_WC_CHGRCTRL0_WDT_NOKICK BIT(7) +#define CHT_WC_CHGRCTRL0_TTLCK BIT(4) +#define CHT_WC_CHGRCTRL0_CCSM_OFF BIT(5) +#define CHT_WC_CHGRCTRL0_DBPOFF BIT(6) +#define CHT_WC_CHGRCTRL0_CHR_WDT_NOKICK BIT(7) #define CHT_WC_CHGRCTRL1 0x5e17 @@ -52,7 +44,7 @@ #define CHT_WC_USBSRC_TYPE_ACA 4 #define CHT_WC_USBSRC_TYPE_SE1 5 #define CHT_WC_USBSRC_TYPE_MHL 6 -#define CHT_WC_USBSRC_TYPE_FLOAT_DP_DN 7 +#define CHT_WC_USBSRC_TYPE_FLOATING 7 #define CHT_WC_USBSRC_TYPE_OTHER 8 #define CHT_WC_USBSRC_TYPE_DCP_EXTPHY 9 @@ -61,9 +53,12 @@ #define CHT_WC_PWRSRC_STS 0x6e1e #define CHT_WC_PWRSRC_VBUS BIT(0) #define CHT_WC_PWRSRC_DC BIT(1) -#define CHT_WC_PWRSRC_BAT BIT(2) -#define CHT_WC_PWRSRC_ID_GND BIT(3) -#define CHT_WC_PWRSRC_ID_FLOAT BIT(4) +#define CHT_WC_PWRSRC_BATT BIT(2) +#define CHT_WC_PWRSRC_USBID_MASK GENMASK(4, 3) +#define CHT_WC_PWRSRC_USBID_SHIFT 3 +#define CHT_WC_PWRSRC_RID_ACA 0 +#define CHT_WC_PWRSRC_RID_GND 1 +#define CHT_WC_PWRSRC_RID_FLOAT 2 #define CHT_WC_VBUS_GPIO_CTLO 0x6e2d #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT BIT(0) @@ -104,16 +99,20 @@ struct cht_wc_extcon_data { static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts) { - if (pwrsrc_sts & CHT_WC_PWRSRC_ID_GND) + switch ((pwrsrc_sts & CHT_WC_PWRSRC_USBID_MASK) >> CHT_WC_PWRSRC_USBID_SHIFT) { + case CHT_WC_PWRSRC_RID_GND: return USB_ID_GND; - if (pwrsrc_sts & CHT_WC_PWRSRC_ID_FLOAT) + case CHT_WC_PWRSRC_RID_FLOAT: return USB_ID_FLOAT; - - /* - * Once we have iio support for the gpadc we should read the USBID - * gpadc channel here and determine ACA role based on that. - */ - return USB_ID_FLOAT; + case CHT_WC_PWRSRC_RID_ACA: + default: + /* + * Once we have IIO support for the GPADC we should read + * the USBID GPADC channel here and determine ACA role + * based on that. + */ + return USB_ID_FLOAT; + } } static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext, @@ -156,9 +155,9 @@ static int cht_wc_extcon_get_charger(struct cht_wc_extcon_data *ext, dev_warn(ext->dev, "Unhandled charger type %d, defaulting to SDP\n", ret); - /* Fall through, treat as SDP */ + return EXTCON_CHG_USB_SDP; case CHT_WC_USBSRC_TYPE_SDP: - case CHT_WC_USBSRC_TYPE_FLOAT_DP_DN: + case CHT_WC_USBSRC_TYPE_FLOATING: case CHT_WC_USBSRC_TYPE_OTHER: return EXTCON_CHG_USB_SDP; case CHT_WC_USBSRC_TYPE_CDP: @@ -279,7 +278,7 @@ static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable) { int ret, mask, val; - mask = CHT_WC_CHGRCTRL0_SWCONTROL | CHT_WC_CHGRCTRL0_CCSM_OFF_MASK; + mask = CHT_WC_CHGRCTRL0_SWCONTROL | CHT_WC_CHGRCTRL0_CCSM_OFF; val = enable ? mask : 0; ret = regmap_update_bits(ext->regmap, CHT_WC_CHGRCTRL0, mask, val); if (ret) @@ -292,6 +291,7 @@ static int cht_wc_extcon_probe(struct platform_device *pdev) { struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent); struct cht_wc_extcon_data *ext; + unsigned long mask = ~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_USBID_MASK); int irq, ret; irq = platform_get_irq(pdev, 0); @@ -352,9 +352,7 @@ static int cht_wc_extcon_probe(struct platform_device *pdev) } /* Unmask irqs */ - ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, - (int)~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_ID_GND | - CHT_WC_PWRSRC_ID_FLOAT)); + ret = regmap_write(ext->regmap, CHT_WC_PWRSRC_IRQ_MASK, mask); if (ret) { dev_err(ext->dev, "Error writing irq-mask: %d\n", ret); goto disable_sw_control; diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Intel INT3496 ACPI device extcon driver * @@ -7,15 +8,6 @@ * * Copyright (c) 2014, Intel Corporation. * Author: David Cohen <david.a.cohen@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/acpi.h> @@ -192,4 +184,4 @@ module_platform_driver(int3496_driver); MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver"); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c @@ -1,20 +1,10 @@ -/* - * extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC - * - * Copyright (C) 2013,2014 Samsung Electronics - * Chanwoo Choi <cw00.choi@samsung.com> - * Krzysztof Kozlowski <krzk@kernel.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ +// SPDX-License-Identifier: GPL-2.0+ +// +// extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC +// +// Copyright (C) 2013,2014 Samsung Electronics +// Chanwoo Choi <cw00.choi@samsung.com> +// Krzysztof Kozlowski <krzk@kernel.org> #include <linux/kernel.h> #include <linux/module.h> diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c @@ -1,19 +1,9 @@ -/* - * extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC - * - * Copyright (C) 2012 Samsung Electrnoics - * Chanwoo Choi <cw00.choi@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ +// SPDX-License-Identifier: GPL-2.0+ +// +// extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC +// +// Copyright (C) 2012 Samsung Electrnoics +// Chanwoo Choi <cw00.choi@samsung.com> #include <linux/kernel.h> #include <linux/module.h> diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c @@ -1,15 +1,10 @@ -/* - * extcon-max77843.c - Maxim MAX77843 extcon driver to support - * MUIC(Micro USB Interface Controller) - * - * Copyright (C) 2015 Samsung Electronics - * Author: Jaewon Kim <jaewon02.kim@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - */ +// SPDX-License-Identifier: GPL-2.0+ +// +// extcon-max77843.c - Maxim MAX77843 extcon driver to support +// MUIC(Micro USB Interface Controller) +// +// Copyright (C) 2015 Samsung Electronics +// Author: Jaewon Kim <jaewon02.kim@samsung.com> #include <linux/extcon-provider.h> #include <linux/i2c.h> diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c @@ -1,19 +1,9 @@ -/* - * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC - * - * Copyright (C) 2012 Samsung Electronics - * Donggeun Kim <dg77.kim@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ +// SPDX-License-Identifier: GPL-2.0+ +// +// extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC +// +// Copyright (C) 2012 Samsung Electronics +// Donggeun Kim <dg77.kim@samsung.com> #include <linux/kernel.h> #include <linux/module.h> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c @@ -628,7 +628,7 @@ int extcon_get_property(struct extcon_dev *edev, unsigned int id, unsigned long flags; int index, ret = 0; - *prop_val = (union extcon_property_value)(0); + *prop_val = (union extcon_property_value){0}; if (!edev) return -EINVAL; @@ -1123,7 +1123,6 @@ int extcon_dev_register(struct extcon_dev *edev) (unsigned long)atomic_inc_return(&edev_no)); if (edev->max_supported) { - char buf[10]; char *str; struct extcon_cable *cable; @@ -1137,9 +1136,7 @@ int extcon_dev_register(struct extcon_dev *edev) for (index = 0; index < edev->max_supported; index++) { cable = &edev->cables[index]; - snprintf(buf, 10, "cable.%d", index); - str = kzalloc(strlen(buf) + 1, - GFP_KERNEL); + str = kasprintf(GFP_KERNEL, "cable.%d", index); if (!str) { for (index--; index >= 0; index--) { cable = &edev->cables[index]; @@ -1149,7 +1146,6 @@ int extcon_dev_register(struct extcon_dev *edev) goto err_alloc_cables; } - strcpy(str, buf); cable->edev = edev; cable->cable_index = index; @@ -1172,7 +1168,6 @@ int extcon_dev_register(struct extcon_dev *edev) } if (edev->max_supported && edev->mutually_exclusive) { - char buf[80]; char *name; /* Count the size of mutually_exclusive array */ @@ -1197,9 +1192,8 @@ int extcon_dev_register(struct extcon_dev *edev) } for (index = 0; edev->mutually_exclusive[index]; index++) { - sprintf(buf, "0x%x", edev->mutually_exclusive[index]); - name = kzalloc(strlen(buf) + 1, - GFP_KERNEL); + name = kasprintf(GFP_KERNEL, "0x%x", + edev->mutually_exclusive[index]); if (!name) { for (index--; index >= 0; index--) { kfree(edev->d_attrs_muex[index].attr. @@ -1210,7 +1204,6 @@ int extcon_dev_register(struct extcon_dev *edev) ret = -ENOMEM; goto err_muex; } - strcpy(name, buf); sysfs_attr_init(&edev->d_attrs_muex[index].attr); edev->d_attrs_muex[index].attr.name = name; edev->d_attrs_muex[index].attr.mode = 0000; diff --git a/drivers/firmware/google/Kconfig b/drivers/firmware/google/Kconfig @@ -10,37 +10,31 @@ if GOOGLE_FIRMWARE config GOOGLE_SMI tristate "SMI interface for Google platforms" - depends on X86 && ACPI && DMI && EFI - select EFI_VARS + depends on X86 && ACPI && DMI help Say Y here if you want to enable SMI callbacks for Google platforms. This provides an interface for writing to and - clearing the EFI event log and reading and writing NVRAM + clearing the event log. If EFI_VARS is also enabled this + driver provides an interface for reading and writing NVRAM variables. config GOOGLE_COREBOOT_TABLE - tristate - depends on GOOGLE_COREBOOT_TABLE_ACPI || GOOGLE_COREBOOT_TABLE_OF - -config GOOGLE_COREBOOT_TABLE_ACPI - tristate "Coreboot Table Access - ACPI" - depends on ACPI - select GOOGLE_COREBOOT_TABLE + tristate "Coreboot Table Access" + depends on ACPI || OF help This option enables the coreboot_table module, which provides other - firmware modules to access to the coreboot table. The coreboot table - pointer is accessed through the ACPI "GOOGCB00" object. + firmware modules access to the coreboot table. The coreboot table + pointer is accessed through the ACPI "GOOGCB00" object or the + device tree node /firmware/coreboot. If unsure say N. +config GOOGLE_COREBOOT_TABLE_ACPI + tristate + select GOOGLE_COREBOOT_TABLE + config GOOGLE_COREBOOT_TABLE_OF - tristate "Coreboot Table Access - Device Tree" - depends on OF + tristate select GOOGLE_COREBOOT_TABLE - help - This option enable the coreboot_table module, which provide other - firmware modules to access coreboot table. The coreboot table pointer - is accessed through the device tree node /firmware/coreboot. - If unsure say N. config GOOGLE_MEMCONSOLE tristate diff --git a/drivers/firmware/google/Makefile b/drivers/firmware/google/Makefile @@ -2,8 +2,6 @@ obj-$(CONFIG_GOOGLE_SMI) += gsmi.o obj-$(CONFIG_GOOGLE_COREBOOT_TABLE) += coreboot_table.o -obj-$(CONFIG_GOOGLE_COREBOOT_TABLE_ACPI) += coreboot_table-acpi.o -obj-$(CONFIG_GOOGLE_COREBOOT_TABLE_OF) += coreboot_table-of.o obj-$(CONFIG_GOOGLE_FRAMEBUFFER_COREBOOT) += framebuffer-coreboot.o obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o obj-$(CONFIG_GOOGLE_MEMCONSOLE_COREBOOT) += memconsole-coreboot.o diff --git a/drivers/firmware/google/coreboot_table-acpi.c b/drivers/firmware/google/coreboot_table-acpi.c @@ -1,88 +0,0 @@ -/* - * coreboot_table-acpi.c - * - * Using ACPI to locate Coreboot table and provide coreboot table access. - * - * Copyright 2017 Google Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License v2.0 as published by - * the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/acpi.h> -#include <linux/device.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/io.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> - -#include "coreboot_table.h" - -static int coreboot_table_acpi_probe(struct platform_device *pdev) -{ - phys_addr_t phyaddr; - resource_size_t len; - struct coreboot_table_header __iomem *header = NULL; - struct resource *res; - void __iomem *ptr = NULL; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -EINVAL; - - len = resource_size(res); - if (!res->start || !len) - return -EINVAL; - - phyaddr = res->start; - header = ioremap_cache(phyaddr, sizeof(*header)); - if (header == NULL) - return -ENOMEM; - - ptr = ioremap_cache(phyaddr, - header->header_bytes + header->table_bytes); - iounmap(header); - if (!ptr) - return -ENOMEM; - - return coreboot_table_init(&pdev->dev, ptr); -} - -static int coreboot_table_acpi_remove(struct platform_device *pdev) -{ - return coreboot_table_exit(); -} - -static const struct acpi_device_id cros_coreboot_acpi_match[] = { - { "GOOGCB00", 0 }, - { "BOOT0000", 0 }, - { } -}; -MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match); - -static struct platform_driver coreboot_table_acpi_driver = { - .probe = coreboot_table_acpi_probe, - .remove = coreboot_table_acpi_remove, - .driver = { - .name = "coreboot_table_acpi", - .acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match), - }, -}; - -static int __init coreboot_table_acpi_init(void) -{ - return platform_driver_register(&coreboot_table_acpi_driver); -} - -module_init(coreboot_table_acpi_init); - -MODULE_AUTHOR("Google, Inc."); -MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/coreboot_table-of.c b/drivers/firmware/google/coreboot_table-of.c @@ -1,82 +0,0 @@ -/* - * coreboot_table-of.c - * - * Coreboot table access through open firmware. - * - * Copyright 2017 Google Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License v2.0 as published by - * the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/device.h> -#include <linux/io.h> -#include <linux/module.h> -#include <linux/of_address.h> -#include <linux/of_platform.h> -#include <linux/platform_device.h> - -#include "coreboot_table.h" - -static int coreboot_table_of_probe(struct platform_device *pdev) -{ - struct device_node *fw_dn = pdev->dev.of_node; - void __iomem *ptr; - - ptr = of_iomap(fw_dn, 0); - of_node_put(fw_dn); - if (!ptr) - return -ENOMEM; - - return coreboot_table_init(&pdev->dev, ptr); -} - -static int coreboot_table_of_remove(struct platform_device *pdev) -{ - return coreboot_table_exit(); -} - -static const struct of_device_id coreboot_of_match[] = { - { .compatible = "coreboot" }, - {}, -}; - -static struct platform_driver coreboot_table_of_driver = { - .probe = coreboot_table_of_probe, - .remove = coreboot_table_of_remove, - .driver = { - .name = "coreboot_table_of", - .of_match_table = coreboot_of_match, - }, -}; - -static int __init platform_coreboot_table_of_init(void) -{ - struct platform_device *pdev; - struct device_node *of_node; - - /* Limit device creation to the presence of /firmware/coreboot node */ - of_node = of_find_node_by_path("/firmware/coreboot"); - if (!of_node) - return -ENODEV; - - if (!of_match_node(coreboot_of_match, of_node)) - return -ENODEV; - - pdev = of_platform_device_create(of_node, "coreboot_table_of", NULL); - if (!pdev) - return -ENODEV; - - return platform_driver_register(&coreboot_table_of_driver); -} - -module_init(platform_coreboot_table_of_init); - -MODULE_AUTHOR("Google, Inc."); -MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c @@ -16,12 +16,15 @@ * GNU General Public License for more details. */ +#include <linux/acpi.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> #include <linux/slab.h> #include "coreboot_table.h" @@ -29,8 +32,6 @@ #define CB_DEV(d) container_of(d, struct coreboot_device, dev) #define CB_DRV(d) container_of(d, struct coreboot_driver, drv) -static struct coreboot_table_header __iomem *ptr_header; - static int coreboot_bus_match(struct device *dev, struct device_driver *drv) { struct coreboot_device *device = CB_DEV(dev); @@ -70,12 +71,6 @@ static struct bus_type coreboot_bus_type = { .remove = coreboot_bus_remove, }; -static int __init coreboot_bus_init(void) -{ - return bus_register(&coreboot_bus_type); -} -module_init(coreboot_bus_init); - static void coreboot_device_release(struct device *dev) { struct coreboot_device *device = CB_DEV(dev); @@ -97,62 +92,117 @@ void coreboot_driver_unregister(struct coreboot_driver *driver) } EXPORT_SYMBOL(coreboot_driver_unregister); -int coreboot_table_init(struct device *dev, void __iomem *ptr) +static int coreboot_table_populate(struct device *dev, void *ptr) { int i, ret; void *ptr_entry; struct coreboot_device *device; - struct coreboot_table_entry entry; - struct coreboot_table_header header; - - ptr_header = ptr; - memcpy_fromio(&header, ptr_header, sizeof(header)); - - if (strncmp(header.signature, "LBIO", sizeof(header.signature))) { - pr_warn("coreboot_table: coreboot table missing or corrupt!\n"); - return -ENODEV; - } + struct coreboot_table_entry *entry; + struct coreboot_table_header *header = ptr; - ptr_entry = (void *)ptr_header + header.header_bytes; - for (i = 0; i < header.table_entries; i++) { - memcpy_fromio(&entry, ptr_entry, sizeof(entry)); + ptr_entry = ptr + header->header_bytes; + for (i = 0; i < header->table_entries; i++) { + entry = ptr_entry; - device = kzalloc(sizeof(struct device) + entry.size, GFP_KERNEL); - if (!device) { - ret = -ENOMEM; - break; - } + device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL); + if (!device) + return -ENOMEM; dev_set_name(&device->dev, "coreboot%d", i); device->dev.parent = dev; device->dev.bus = &coreboot_bus_type; device->dev.release = coreboot_device_release; - memcpy_fromio(&device->entry, ptr_entry, entry.size); + memcpy(&device->entry, ptr_entry, entry->size); ret = device_register(&device->dev); if (ret) { put_device(&device->dev); - break; + return ret; } - ptr_entry += entry.size; + ptr_entry += entry->size; } - return ret; + return 0; } -EXPORT_SYMBOL(coreboot_table_init); -int coreboot_table_exit(void) +static int coreboot_table_probe(struct platform_device *pdev) { - if (ptr_header) { - bus_unregister(&coreboot_bus_type); - iounmap(ptr_header); - ptr_header = NULL; + resource_size_t len; + struct coreboot_table_header *header; + struct resource *res; + struct device *dev = &pdev->dev; + void *ptr; + int ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + + len = resource_size(res); + if (!res->start || !len) + return -EINVAL; + + /* Check just the header first to make sure things are sane */ + header = memremap(res->start, sizeof(*header), MEMREMAP_WB); + if (!header) + return -ENOMEM; + + len = header->header_bytes + header->table_bytes; + ret = strncmp(header->signature, "LBIO", sizeof(header->signature)); + memunmap(header); + if (ret) { + dev_warn(dev, "coreboot table missing or corrupt!\n"); + return -ENODEV; } + ptr = memremap(res->start, len, MEMREMAP_WB); + if (!ptr) + return -ENOMEM; + + ret = bus_register(&coreboot_bus_type); + if (!ret) { + ret = coreboot_table_populate(dev, ptr); + if (ret) + bus_unregister(&coreboot_bus_type); + } + memunmap(ptr); + + return ret; +} + +static int coreboot_table_remove(struct platform_device *pdev) +{ + bus_unregister(&coreboot_bus_type); return 0; } -EXPORT_SYMBOL(coreboot_table_exit); +#ifdef CONFIG_ACPI +static const struct acpi_device_id cros_coreboot_acpi_match[] = { + { "GOOGCB00", 0 }, + { "BOOT0000", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match); +#endif + +#ifdef CONFIG_OF +static const struct of_device_id coreboot_of_match[] = { + { .compatible = "coreboot" }, + {} +}; +MODULE_DEVICE_TABLE(of, coreboot_of_match); +#endif + +static struct platform_driver coreboot_table_driver = { + .probe = coreboot_table_probe, + .remove = coreboot_table_remove, + .driver = { + .name = "coreboot_table", + .acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match), + .of_match_table = of_match_ptr(coreboot_of_match), + }, +}; +module_platform_driver(coreboot_table_driver); MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/coreboot_table.h b/drivers/firmware/google/coreboot_table.h @@ -91,10 +91,4 @@ int coreboot_driver_register(struct coreboot_driver *driver); /* Unregister a driver that uses the data from a coreboot table. */ void coreboot_driver_unregister(struct coreboot_driver *driver); -/* Initialize coreboot table module given a pointer to iomem */ -int coreboot_table_init(struct device *dev, void __iomem *ptr); - -/* Cleanup coreboot table module */ -int coreboot_table_exit(void); - #endif /* __COREBOOT_TABLE_H */ diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c @@ -29,6 +29,7 @@ #include <linux/efi.h> #include <linux/module.h> #include <linux/ucs2_string.h> +#include <linux/suspend.h> #define GSMI_SHUTDOWN_CLEAN 0 /* Clean Shutdown */ /* TODO(mikew@google.com): Tie in HARDLOCKUP_DETECTOR with NMIWDT */ @@ -70,6 +71,8 @@ #define GSMI_CMD_SET_NVRAM_VAR 0x03 #define GSMI_CMD_SET_EVENT_LOG 0x08 #define GSMI_CMD_CLEAR_EVENT_LOG 0x09 +#define GSMI_CMD_LOG_S0IX_SUSPEND 0x0a +#define GSMI_CMD_LOG_S0IX_RESUME 0x0b #define GSMI_CMD_CLEAR_CONFIG 0x20 #define GSMI_CMD_HANDSHAKE_TYPE 0xC1 @@ -84,7 +87,7 @@ struct gsmi_buf { u32 address; /* physical address of buffer */ }; -struct gsmi_device { +static struct gsmi_device { struct platform_device *pdev; /* platform device */ struct gsmi_buf *name_buf; /* variable name buffer */ struct gsmi_buf *data_buf; /* generic data buffer */ @@ -122,7 +125,6 @@ struct gsmi_log_entry_type_1 { u32 instance; } __packed; - /* * Some platforms don't have explicit SMI handshake * and need to wait for SMI to complete. @@ -133,6 +135,15 @@ module_param(spincount, uint, 0600); MODULE_PARM_DESC(spincount, "The number of loop iterations to use when using the spin handshake."); +/* + * Platforms might not support S0ix logging in their GSMI handlers. In order to + * avoid any side-effects of generating an SMI for S0ix logging, use the S0ix + * related GSMI commands only for those platforms that explicitly enable this + * option. + */ +static bool s0ix_logging_enable; +module_param(s0ix_logging_enable, bool, 0600); + static struct gsmi_buf *gsmi_buf_alloc(void) { struct gsmi_buf *smibuf; @@ -289,6 +300,10 @@ static int gsmi_exec(u8 func, u8 sub) return rc; } +#ifdef CONFIG_EFI_VARS + +static struct efivars efivars; + static efi_status_t gsmi_get_variable(efi_char16_t *name, efi_guid_t *vendor, u32 *attr, unsigned long *data_size, @@ -466,6 +481,8 @@ static const struct efivar_operations efivar_ops = { .get_next_variable = gsmi_get_next_variable, }; +#endif /* CONFIG_EFI_VARS */ + static ssize_t eventlog_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) @@ -480,11 +497,10 @@ static ssize_t eventlog_write(struct file *filp, struct kobject *kobj, if (count < sizeof(u32)) return -EINVAL; param.type = *(u32 *)buf; - count -= sizeof(u32); buf += sizeof(u32); /* The remaining buffer is the data payload */ - if (count > gsmi_dev.data_buf->length) + if ((count - sizeof(u32)) > gsmi_dev.data_buf->length) return -EINVAL; param.data_len = count - sizeof(u32); @@ -504,7 +520,7 @@ static ssize_t eventlog_write(struct file *filp, struct kobject *kobj, spin_unlock_irqrestore(&gsmi_dev.lock, flags); - return rc; + return (rc == 0) ? count : rc; } @@ -716,6 +732,12 @@ static const struct dmi_system_id gsmi_dmi_table[] __initconst = { DMI_MATCH(DMI_BOARD_VENDOR, "Google, Inc."), }, }, + { + .ident = "Coreboot Firmware", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + }, + }, {} }; MODULE_DEVICE_TABLE(dmi, gsmi_dmi_table); @@ -762,7 +784,6 @@ static __init int gsmi_system_valid(void) } static struct kobject *gsmi_kobj; -static struct efivars efivars; static const struct platform_device_info gsmi_dev_info = { .name = "gsmi", @@ -771,6 +792,78 @@ static const struct platform_device_info gsmi_dev_info = { .dma_mask = DMA_BIT_MASK(32), }; +#ifdef CONFIG_PM +static void gsmi_log_s0ix_info(u8 cmd) +{ + unsigned long flags; + + /* + * If platform has not enabled S0ix logging, then no action is + * necessary. + */ + if (!s0ix_logging_enable) + return; + + spin_lock_irqsave(&gsmi_dev.lock, flags); + + memset(gsmi_dev.param_buf->start, 0, gsmi_dev.param_buf->length); + + gsmi_exec(GSMI_CALLBACK, cmd); + + spin_unlock_irqrestore(&gsmi_dev.lock, flags); +} + +static int gsmi_log_s0ix_suspend(struct device *dev) +{ + /* + * If system is not suspending via firmware using the standard ACPI Sx + * types, then make a GSMI call to log the suspend info. + */ + if (!pm_suspend_via_firmware()) + gsmi_log_s0ix_info(GSMI_CMD_LOG_S0IX_SUSPEND); + + /* + * Always return success, since we do not want suspend + * to fail just because of logging failure. + */ + return 0; +} + +static int gsmi_log_s0ix_resume(struct device *dev) +{ + /* + * If system did not resume via firmware, then make a GSMI call to log + * the resume info and wake source. + */ + if (!pm_resume_via_firmware()) + gsmi_log_s0ix_info(GSMI_CMD_LOG_S0IX_RESUME); + + /* + * Always return success, since we do not want resume + * to fail just because of logging failure. + */ + return 0; +} + +static const struct dev_pm_ops gsmi_pm_ops = { + .suspend_noirq = gsmi_log_s0ix_suspend, + .resume_noirq = gsmi_log_s0ix_resume, +}; + +static int gsmi_platform_driver_probe(struct platform_device *dev) +{ + return 0; +} + +static struct platform_driver gsmi_driver_info = { + .driver = { + .name = "gsmi", + .pm = &gsmi_pm_ops, + }, + .probe = gsmi_platform_driver_probe, +}; +#endif + static __init int gsmi_init(void) { unsigned long flags; @@ -782,6 +875,14 @@ static __init int gsmi_init(void) gsmi_dev.smi_cmd = acpi_gbl_FADT.smi_command; +#ifdef CONFIG_PM + ret = platform_driver_register(&gsmi_driver_info); + if (unlikely(ret)) { + printk(KERN_ERR "gsmi: unable to register platform driver\n"); + return ret; + } +#endif + /* register device */ gsmi_dev.pdev = platform_device_register_full(&gsmi_dev_info); if (IS_ERR(gsmi_dev.pdev)) { @@ -886,11 +987,14 @@ static __init int gsmi_init(void) goto out_remove_bin_file; } +#ifdef CONFIG_EFI_VARS ret = efivars_register(&efivars, &efivar_ops, gsmi_kobj); if (ret) { printk(KERN_INFO "gsmi: Failed to register efivars\n"); - goto out_remove_sysfs_files; + sysfs_remove_files(gsmi_kobj, gsmi_attrs); + goto out_remove_bin_file; } +#endif register_reboot_notifier(&gsmi_reboot_notifier); register_die_notifier(&gsmi_die_notifier); @@ -901,8 +1005,6 @@ static __init int gsmi_init(void) return 0; -out_remove_sysfs_files: - sysfs_remove_files(gsmi_kobj, gsmi_attrs); out_remove_bin_file: sysfs_remove_bin_file(gsmi_kobj, &eventlog_bin_attr); out_err: @@ -922,7 +1024,9 @@ static void __exit gsmi_exit(void) unregister_die_notifier(&gsmi_die_notifier); atomic_notifier_chain_unregister(&panic_notifier_list, &gsmi_panic_notifier); +#ifdef CONFIG_EFI_VARS efivars_unregister(&efivars); +#endif sysfs_remove_files(gsmi_kobj, gsmi_attrs); sysfs_remove_bin_file(gsmi_kobj, &eventlog_bin_attr); diff --git a/drivers/firmware/google/vpd.c b/drivers/firmware/google/vpd.c @@ -198,7 +198,7 @@ static int vpd_section_init(const char *name, struct vpd_section *sec, sec->name = name; - /* We want to export the raw partion with name ${name}_raw */ + /* We want to export the raw partition with name ${name}_raw */ sec->raw_name = kasprintf(GFP_KERNEL, "%s_raw", name); if (!sec->raw_name) { err = -ENOMEM; diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c @@ -453,8 +453,8 @@ static int altera_cvp_probe(struct pci_dev *pdev, snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s @%s", ALTERA_CVP_MGR_NAME, pci_name(pdev)); - mgr = fpga_mgr_create(&pdev->dev, conf->mgr_name, - &altera_cvp_ops, conf); + mgr = devm_fpga_mgr_create(&pdev->dev, conf->mgr_name, + &altera_cvp_ops, conf); if (!mgr) { ret = -ENOMEM; goto err_unmap; @@ -463,10 +463,8 @@ static int altera_cvp_probe(struct pci_dev *pdev, pci_set_drvdata(pdev, mgr); ret = fpga_mgr_register(mgr); - if (ret) { - fpga_mgr_free(mgr); + if (ret) goto err_unmap; - } ret = driver_create_file(&altera_cvp_driver.driver, &driver_attr_chkcfg); diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c @@ -121,18 +121,16 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) /* Get f2s bridge configuration saved in handoff register */ regmap_read(sysmgr, SYSMGR_ISWGRP_HANDOFF3, &priv->mask); - br = fpga_bridge_create(dev, F2S_BRIDGE_NAME, - &altera_fpga2sdram_br_ops, priv); + br = devm_fpga_bridge_create(dev, F2S_BRIDGE_NAME, + &altera_fpga2sdram_br_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); ret = fpga_bridge_register(br); - if (ret) { - fpga_bridge_free(br); + if (ret) return ret; - } dev_info(dev, "driver initialized with handoff %08x\n", priv->mask); diff --git a/drivers/fpga/altera-freeze-bridge.c b/drivers/fpga/altera-freeze-bridge.c @@ -213,7 +213,6 @@ static int altera_freeze_br_probe(struct platform_device *pdev) struct fpga_bridge *br; struct resource *res; u32 status, revision; - int ret; if (!np) return -ENODEV; @@ -245,20 +244,14 @@ static int altera_freeze_br_probe(struct platform_device *pdev) priv->base_addr = base_addr; - br = fpga_bridge_create(dev, FREEZE_BRIDGE_NAME, - &altera_freeze_br_br_ops, priv); + br = devm_fpga_bridge_create(dev, FREEZE_BRIDGE_NAME, + &altera_freeze_br_br_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); - ret = fpga_bridge_register(br); - if (ret) { - fpga_bridge_free(br); - return ret; - } - - return 0; + return fpga_bridge_register(br); } static int altera_freeze_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c @@ -180,7 +180,8 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) } } - br = fpga_bridge_create(dev, priv->name, &altera_hps2fpga_br_ops, priv); + br = devm_fpga_bridge_create(dev, priv->name, + &altera_hps2fpga_br_ops, priv); if (!br) { ret = -ENOMEM; goto err; @@ -190,12 +191,10 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) ret = fpga_bridge_register(br); if (ret) - goto err_free; + goto err; return 0; -err_free: - fpga_bridge_free(br); err: clk_disable_unprepare(priv->clk); diff --git a/drivers/fpga/altera-pr-ip-core.c b/drivers/fpga/altera-pr-ip-core.c @@ -177,7 +177,6 @@ int alt_pr_register(struct device *dev, void __iomem *reg_base) { struct alt_pr_priv *priv; struct fpga_manager *mgr; - int ret; u32 val; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -192,17 +191,13 @@ int alt_pr_register(struct device *dev, void __iomem *reg_base) (val & ALT_PR_CSR_STATUS_MSK) >> ALT_PR_CSR_STATUS_SFT, (int)(val & ALT_PR_CSR_PR_START)); - mgr = fpga_mgr_create(dev, dev_name(dev), &alt_pr_ops, priv); + mgr = devm_fpga_mgr_create(dev, dev_name(dev), &alt_pr_ops, priv); if (!mgr) return -ENOMEM; dev_set_drvdata(dev, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } EXPORT_SYMBOL_GPL(alt_pr_register); diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c @@ -239,7 +239,6 @@ static int altera_ps_probe(struct spi_device *spi) struct altera_ps_conf *conf; const struct of_device_id *of_id; struct fpga_manager *mgr; - int ret; conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL); if (!conf) @@ -275,18 +274,14 @@ static int altera_ps_probe(struct spi_device *spi) snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s %s", dev_driver_string(&spi->dev), dev_name(&spi->dev)); - mgr = fpga_mgr_create(&spi->dev, conf->mgr_name, - &altera_ps_ops, conf); + mgr = devm_fpga_mgr_create(&spi->dev, conf->mgr_name, + &altera_ps_ops, conf); if (!mgr) return -ENOMEM; spi_set_drvdata(spi, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int altera_ps_remove(struct spi_device *spi) diff --git a/drivers/fpga/dfl-afu-dma-region.c b/drivers/fpga/dfl-afu-dma-region.c @@ -70,7 +70,7 @@ static int afu_dma_adjust_locked_vm(struct device *dev, long npages, bool incr) dev_dbg(dev, "[%d] RLIMIT_MEMLOCK %c%ld %ld/%ld%s\n", current->pid, incr ? '+' : '-', npages << PAGE_SHIFT, current->mm->locked_vm << PAGE_SHIFT, rlimit(RLIMIT_MEMLOCK), - ret ? "- execeeded" : ""); + ret ? "- exceeded" : ""); up_write(&current->mm->mmap_sem); diff --git a/drivers/fpga/dfl-fme-br.c b/drivers/fpga/dfl-fme-br.c @@ -61,7 +61,6 @@ static int fme_br_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct fme_br_priv *priv; struct fpga_bridge *br; - int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -69,18 +68,14 @@ static int fme_br_probe(struct platform_device *pdev) priv->pdata = dev_get_platdata(dev); - br = fpga_bridge_create(dev, "DFL FPGA FME Bridge", - &fme_bridge_ops, priv); + br = devm_fpga_bridge_create(dev, "DFL FPGA FME Bridge", + &fme_bridge_ops, priv); if (!br) return -ENOMEM; platform_set_drvdata(pdev, br); - ret = fpga_bridge_register(br); - if (ret) - fpga_bridge_free(br); - - return ret; + return fpga_bridge_register(br); } static int fme_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/dfl-fme-mgr.c b/drivers/fpga/dfl-fme-mgr.c @@ -201,7 +201,7 @@ static int fme_mgr_write(struct fpga_manager *mgr, } if (count < 4) { - dev_err(dev, "Invaild PR bitstream size\n"); + dev_err(dev, "Invalid PR bitstream size\n"); return -EINVAL; } @@ -287,7 +287,6 @@ static int fme_mgr_probe(struct platform_device *pdev) struct fme_mgr_priv *priv; struct fpga_manager *mgr; struct resource *res; - int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -309,19 +308,15 @@ static int fme_mgr_probe(struct platform_device *pdev) fme_mgr_get_compat_id(priv->ioaddr, compat_id); - mgr = fpga_mgr_create(dev, "DFL FME FPGA Manager", - &fme_mgr_ops, priv); + mgr = devm_fpga_mgr_create(dev, "DFL FME FPGA Manager", + &fme_mgr_ops, priv); if (!mgr) return -ENOMEM; mgr->compat_id = compat_id; platform_set_drvdata(pdev, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int fme_mgr_remove(struct platform_device *pdev) diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c @@ -39,7 +39,7 @@ static int fme_region_probe(struct platform_device *pdev) if (IS_ERR(mgr)) return -EPROBE_DEFER; - region = fpga_region_create(dev, mgr, fme_region_get_bridges); + region = devm_fpga_region_create(dev, mgr, fme_region_get_bridges); if (!region) { ret = -ENOMEM; goto eprobe_mgr_put; @@ -51,14 +51,12 @@ static int fme_region_probe(struct platform_device *pdev) ret = fpga_region_register(region); if (ret) - goto region_free; + goto eprobe_mgr_put; dev_dbg(dev, "DFL FME FPGA Region probed\n"); return 0; -region_free: - fpga_region_free(region); eprobe_mgr_put: fpga_mgr_put(mgr); return ret; diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c @@ -899,7 +899,7 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) if (!cdev) return ERR_PTR(-ENOMEM); - cdev->region = fpga_region_create(info->dev, NULL, NULL); + cdev->region = devm_fpga_region_create(info->dev, NULL, NULL); if (!cdev->region) { ret = -ENOMEM; goto free_cdev_exit; @@ -911,7 +911,7 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) ret = fpga_region_register(cdev->region); if (ret) - goto free_region_exit; + goto free_cdev_exit; /* create and init build info for enumeration */ binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL); @@ -942,8 +942,6 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) unregister_region_exit: fpga_region_unregister(cdev->region); -free_region_exit: - fpga_region_free(cdev->region); free_cdev_exit: devm_kfree(info->dev, cdev); return ERR_PTR(ret); diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c @@ -324,6 +324,9 @@ ATTRIBUTE_GROUPS(fpga_bridge); * @br_ops: pointer to structure of fpga bridge ops * @priv: FPGA bridge private data * + * The caller of this function is responsible for freeing the bridge with + * fpga_bridge_free(). Using devm_fpga_bridge_create() instead is recommended. + * * Return: struct fpga_bridge or NULL */ struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name, @@ -378,8 +381,8 @@ error_kfree: EXPORT_SYMBOL_GPL(fpga_bridge_create); /** - * fpga_bridge_free - free a fpga bridge and its id - * @bridge: FPGA bridge struct created by fpga_bridge_create + * fpga_bridge_free - free a fpga bridge created by fpga_bridge_create() + * @bridge: FPGA bridge struct */ void fpga_bridge_free(struct fpga_bridge *bridge) { @@ -388,9 +391,56 @@ void fpga_bridge_free(struct fpga_bridge *bridge) } EXPORT_SYMBOL_GPL(fpga_bridge_free); +static void devm_fpga_bridge_release(struct device *dev, void *res) +{ + struct fpga_bridge *bridge = *(struct fpga_bridge **)res; + + fpga_bridge_free(bridge); +} + /** - * fpga_bridge_register - register a fpga bridge - * @bridge: FPGA bridge struct created by fpga_bridge_create + * devm_fpga_bridge_create - create and init a managed struct fpga_bridge + * @dev: FPGA bridge device from pdev + * @name: FPGA bridge name + * @br_ops: pointer to structure of fpga bridge ops + * @priv: FPGA bridge private data + * + * This function is intended for use in a FPGA bridge driver's probe function. + * After the bridge driver creates the struct with devm_fpga_bridge_create(), it + * should register the bridge with fpga_bridge_register(). The bridge driver's + * remove function should call fpga_bridge_unregister(). The bridge struct + * allocated with this function will be freed automatically on driver detach. + * This includes the case of a probe function returning error before calling + * fpga_bridge_register(), the struct will still get cleaned up. + * + * Return: struct fpga_bridge or NULL + */ +struct fpga_bridge +*devm_fpga_bridge_create(struct device *dev, const char *name, + const struct fpga_bridge_ops *br_ops, void *priv) +{ + struct fpga_bridge **ptr, *bridge; + + ptr = devres_alloc(devm_fpga_bridge_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + bridge = fpga_bridge_create(dev, name, br_ops, priv); + if (!bridge) { + devres_free(ptr); + } else { + *ptr = bridge; + devres_add(dev, ptr); + } + + return bridge; +} +EXPORT_SYMBOL_GPL(devm_fpga_bridge_create); + +/** + * fpga_bridge_register - register a FPGA bridge + * + * @bridge: FPGA bridge struct * * Return: 0 for success, error code otherwise. */ @@ -412,8 +462,11 @@ int fpga_bridge_register(struct fpga_bridge *bridge) EXPORT_SYMBOL_GPL(fpga_bridge_register); /** - * fpga_bridge_unregister - unregister and free a fpga bridge - * @bridge: FPGA bridge struct created by fpga_bridge_create + * fpga_bridge_unregister - unregister a FPGA bridge + * + * @bridge: FPGA bridge struct + * + * This function is intended for use in a FPGA bridge driver's remove function. */ void fpga_bridge_unregister(struct fpga_bridge *bridge) { @@ -430,9 +483,6 @@ EXPORT_SYMBOL_GPL(fpga_bridge_unregister); static void fpga_bridge_dev_release(struct device *dev) { - struct fpga_bridge *bridge = to_fpga_bridge(dev); - - fpga_bridge_free(bridge); } static int __init fpga_bridge_dev_init(void) diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c @@ -558,6 +558,9 @@ EXPORT_SYMBOL_GPL(fpga_mgr_unlock); * @mops: pointer to structure of fpga manager ops * @priv: fpga manager private data * + * The caller of this function is responsible for freeing the struct with + * fpga_mgr_free(). Using devm_fpga_mgr_create() instead is recommended. + * * Return: pointer to struct fpga_manager or NULL */ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name, @@ -618,8 +621,8 @@ error_kfree: EXPORT_SYMBOL_GPL(fpga_mgr_create); /** - * fpga_mgr_free - deallocate a FPGA manager - * @mgr: fpga manager struct created by fpga_mgr_create + * fpga_mgr_free - free a FPGA manager created with fpga_mgr_create() + * @mgr: fpga manager struct */ void fpga_mgr_free(struct fpga_manager *mgr) { @@ -628,9 +631,55 @@ void fpga_mgr_free(struct fpga_manager *mgr) } EXPORT_SYMBOL_GPL(fpga_mgr_free); +static void devm_fpga_mgr_release(struct device *dev, void *res) +{ + struct fpga_manager *mgr = *(struct fpga_manager **)res; + + fpga_mgr_free(mgr); +} + +/** + * devm_fpga_mgr_create - create and initialize a managed FPGA manager struct + * @dev: fpga manager device from pdev + * @name: fpga manager name + * @mops: pointer to structure of fpga manager ops + * @priv: fpga manager private data + * + * This function is intended for use in a FPGA manager driver's probe function. + * After the manager driver creates the manager struct with + * devm_fpga_mgr_create(), it should register it with fpga_mgr_register(). The + * manager driver's remove function should call fpga_mgr_unregister(). The + * manager struct allocated with this function will be freed automatically on + * driver detach. This includes the case of a probe function returning error + * before calling fpga_mgr_register(), the struct will still get cleaned up. + * + * Return: pointer to struct fpga_manager or NULL + */ +struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name, + const struct fpga_manager_ops *mops, + void *priv) +{ + struct fpga_manager **ptr, *mgr; + + ptr = devres_alloc(devm_fpga_mgr_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + mgr = fpga_mgr_create(dev, name, mops, priv); + if (!mgr) { + devres_free(ptr); + } else { + *ptr = mgr; + devres_add(dev, ptr); + } + + return mgr; +} +EXPORT_SYMBOL_GPL(devm_fpga_mgr_create); + /** * fpga_mgr_register - register a FPGA manager - * @mgr: fpga manager struct created by fpga_mgr_create + * @mgr: fpga manager struct * * Return: 0 on success, negative error code otherwise. */ @@ -661,8 +710,10 @@ error_device: EXPORT_SYMBOL_GPL(fpga_mgr_register); /** - * fpga_mgr_unregister - unregister and free a FPGA manager - * @mgr: fpga manager struct + * fpga_mgr_unregister - unregister a FPGA manager + * @mgr: fpga manager struct + * + * This function is intended for use in a FPGA manager driver's remove function. */ void fpga_mgr_unregister(struct fpga_manager *mgr) { @@ -681,9 +732,6 @@ EXPORT_SYMBOL_GPL(fpga_mgr_unregister); static void fpga_mgr_dev_release(struct device *dev) { - struct fpga_manager *mgr = to_fpga_manager(dev); - - fpga_mgr_free(mgr); } static int __init fpga_mgr_class_init(void) diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c @@ -185,6 +185,10 @@ ATTRIBUTE_GROUPS(fpga_region); * @mgr: manager that programs this region * @get_bridges: optional function to get bridges to a list * + * The caller of this function is responsible for freeing the resulting region + * struct with fpga_region_free(). Using devm_fpga_region_create() instead is + * recommended. + * * Return: struct fpga_region or NULL */ struct fpga_region @@ -230,8 +234,8 @@ err_free: EXPORT_SYMBOL_GPL(fpga_region_create); /** - * fpga_region_free - free a struct fpga_region - * @region: FPGA region created by fpga_region_create + * fpga_region_free - free a FPGA region created by fpga_region_create() + * @region: FPGA region */ void fpga_region_free(struct fpga_region *region) { @@ -240,21 +244,69 @@ void fpga_region_free(struct fpga_region *region) } EXPORT_SYMBOL_GPL(fpga_region_free); +static void devm_fpga_region_release(struct device *dev, void *res) +{ + struct fpga_region *region = *(struct fpga_region **)res; + + fpga_region_free(region); +} + +/** + * devm_fpga_region_create - create and initialize a managed FPGA region struct + * @dev: device parent + * @mgr: manager that programs this region + * @get_bridges: optional function to get bridges to a list + * + * This function is intended for use in a FPGA region driver's probe function. + * After the region driver creates the region struct with + * devm_fpga_region_create(), it should register it with fpga_region_register(). + * The region driver's remove function should call fpga_region_unregister(). + * The region struct allocated with this function will be freed automatically on + * driver detach. This includes the case of a probe function returning error + * before calling fpga_region_register(), the struct will still get cleaned up. + * + * Return: struct fpga_region or NULL + */ +struct fpga_region +*devm_fpga_region_create(struct device *dev, + struct fpga_manager *mgr, + int (*get_bridges)(struct fpga_region *)) +{ + struct fpga_region **ptr, *region; + + ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return NULL; + + region = fpga_region_create(dev, mgr, get_bridges); + if (!region) { + devres_free(ptr); + } else { + *ptr = region; + devres_add(dev, ptr); + } + + return region; +} +EXPORT_SYMBOL_GPL(devm_fpga_region_create); + /** * fpga_region_register - register a FPGA region - * @region: FPGA region created by fpga_region_create + * @region: FPGA region + * * Return: 0 or -errno */ int fpga_region_register(struct fpga_region *region) { return device_add(&region->dev); - } EXPORT_SYMBOL_GPL(fpga_region_register); /** - * fpga_region_unregister - unregister and free a FPGA region + * fpga_region_unregister - unregister a FPGA region * @region: FPGA region + * + * This function is intended for use in a FPGA region driver's remove function. */ void fpga_region_unregister(struct fpga_region *region) { @@ -264,9 +316,6 @@ EXPORT_SYMBOL_GPL(fpga_region_unregister); static void fpga_region_dev_release(struct device *dev) { - struct fpga_region *region = to_fpga_region(dev); - - fpga_region_free(region); } /** diff --git a/drivers/fpga/ice40-spi.c b/drivers/fpga/ice40-spi.c @@ -175,18 +175,14 @@ static int ice40_fpga_probe(struct spi_device *spi) return ret; } - mgr = fpga_mgr_create(dev, "Lattice iCE40 FPGA Manager", - &ice40_fpga_ops, priv); + mgr = devm_fpga_mgr_create(dev, "Lattice iCE40 FPGA Manager", + &ice40_fpga_ops, priv); if (!mgr) return -ENOMEM; spi_set_drvdata(spi, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int ice40_fpga_remove(struct spi_device *spi) diff --git a/drivers/fpga/machxo2-spi.c b/drivers/fpga/machxo2-spi.c @@ -356,25 +356,20 @@ static int machxo2_spi_probe(struct spi_device *spi) { struct device *dev = &spi->dev; struct fpga_manager *mgr; - int ret; if (spi->max_speed_hz > MACHXO2_MAX_SPEED) { dev_err(dev, "Speed is too high\n"); return -EINVAL; } - mgr = fpga_mgr_create(dev, "Lattice MachXO2 SPI FPGA Manager", - &machxo2_ops, spi); + mgr = devm_fpga_mgr_create(dev, "Lattice MachXO2 SPI FPGA Manager", + &machxo2_ops, spi); if (!mgr) return -ENOMEM; spi_set_drvdata(spi, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int machxo2_spi_remove(struct spi_device *spi) diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c @@ -410,7 +410,7 @@ static int of_fpga_region_probe(struct platform_device *pdev) if (IS_ERR(mgr)) return -EPROBE_DEFER; - region = fpga_region_create(dev, mgr, of_fpga_region_get_bridges); + region = devm_fpga_region_create(dev, mgr, of_fpga_region_get_bridges); if (!region) { ret = -ENOMEM; goto eprobe_mgr_put; @@ -418,7 +418,7 @@ static int of_fpga_region_probe(struct platform_device *pdev) ret = fpga_region_register(region); if (ret) - goto eprobe_free; + goto eprobe_mgr_put; of_platform_populate(np, fpga_region_of_match, NULL, &region->dev); dev_set_drvdata(dev, region); @@ -427,8 +427,6 @@ static int of_fpga_region_probe(struct platform_device *pdev) return 0; -eprobe_free: - fpga_region_free(region); eprobe_mgr_put: fpga_mgr_put(mgr); return ret; diff --git a/drivers/fpga/socfpga-a10.c b/drivers/fpga/socfpga-a10.c @@ -508,8 +508,8 @@ static int socfpga_a10_fpga_probe(struct platform_device *pdev) return -EBUSY; } - mgr = fpga_mgr_create(dev, "SoCFPGA Arria10 FPGA Manager", - &socfpga_a10_fpga_mgr_ops, priv); + mgr = devm_fpga_mgr_create(dev, "SoCFPGA Arria10 FPGA Manager", + &socfpga_a10_fpga_mgr_ops, priv); if (!mgr) return -ENOMEM; @@ -517,7 +517,6 @@ static int socfpga_a10_fpga_probe(struct platform_device *pdev) ret = fpga_mgr_register(mgr); if (ret) { - fpga_mgr_free(mgr); clk_disable_unprepare(priv->clk); return ret; } diff --git a/drivers/fpga/socfpga.c b/drivers/fpga/socfpga.c @@ -571,18 +571,14 @@ static int socfpga_fpga_probe(struct platform_device *pdev) if (ret) return ret; - mgr = fpga_mgr_create(dev, "Altera SOCFPGA FPGA Manager", - &socfpga_fpga_ops, priv); + mgr = devm_fpga_mgr_create(dev, "Altera SOCFPGA FPGA Manager", + &socfpga_fpga_ops, priv); if (!mgr) return -ENOMEM; platform_set_drvdata(pdev, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int socfpga_fpga_remove(struct platform_device *pdev) diff --git a/drivers/fpga/ts73xx-fpga.c b/drivers/fpga/ts73xx-fpga.c @@ -118,7 +118,6 @@ static int ts73xx_fpga_probe(struct platform_device *pdev) struct ts73xx_fpga_priv *priv; struct fpga_manager *mgr; struct resource *res; - int ret; priv = devm_kzalloc(kdev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -133,18 +132,14 @@ static int ts73xx_fpga_probe(struct platform_device *pdev) return PTR_ERR(priv->io_base); } - mgr = fpga_mgr_create(kdev, "TS-73xx FPGA Manager", - &ts73xx_fpga_ops, priv); + mgr = devm_fpga_mgr_create(kdev, "TS-73xx FPGA Manager", + &ts73xx_fpga_ops, priv); if (!mgr) return -ENOMEM; platform_set_drvdata(pdev, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int ts73xx_fpga_remove(struct platform_device *pdev) diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c @@ -121,8 +121,8 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev) clk_disable(priv->clk); - br = fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler", - &xlnx_pr_decoupler_br_ops, priv); + br = devm_fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler", + &xlnx_pr_decoupler_br_ops, priv); if (!br) { err = -ENOMEM; goto err_clk; diff --git a/drivers/fpga/xilinx-spi.c b/drivers/fpga/xilinx-spi.c @@ -144,7 +144,6 @@ static int xilinx_spi_probe(struct spi_device *spi) { struct xilinx_spi_conf *conf; struct fpga_manager *mgr; - int ret; conf = devm_kzalloc(&spi->dev, sizeof(*conf), GFP_KERNEL); if (!conf) @@ -167,18 +166,15 @@ static int xilinx_spi_probe(struct spi_device *spi) return PTR_ERR(conf->done); } - mgr = fpga_mgr_create(&spi->dev, "Xilinx Slave Serial FPGA Manager", - &xilinx_spi_ops, conf); + mgr = devm_fpga_mgr_create(&spi->dev, + "Xilinx Slave Serial FPGA Manager", + &xilinx_spi_ops, conf); if (!mgr) return -ENOMEM; spi_set_drvdata(spi, mgr); - ret = fpga_mgr_register(mgr); - if (ret) - fpga_mgr_free(mgr); - - return ret; + return fpga_mgr_register(mgr); } static int xilinx_spi_remove(struct spi_device *spi) diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c @@ -614,8 +614,8 @@ static int zynq_fpga_probe(struct platform_device *pdev) clk_disable(priv->clk); - mgr = fpga_mgr_create(dev, "Xilinx Zynq FPGA Manager", - &zynq_fpga_ops, priv); + mgr = devm_fpga_mgr_create(dev, "Xilinx Zynq FPGA Manager", + &zynq_fpga_ops, priv); if (!mgr) return -ENOMEM; @@ -624,7 +624,6 @@ static int zynq_fpga_probe(struct platform_device *pdev) err = fpga_mgr_register(mgr); if (err) { dev_err(dev, "unable to register FPGA manager\n"); - fpga_mgr_free(mgr); clk_unprepare(priv->clk); return err; } diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c @@ -79,85 +79,96 @@ void vmbus_setevent(struct vmbus_channel *channel) } EXPORT_SYMBOL_GPL(vmbus_setevent); -/* - * vmbus_open - Open the specified channel. - */ -int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, - u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, - void (*onchannelcallback)(void *context), void *context) +/* vmbus_free_ring - drop mapping of ring buffer */ +void vmbus_free_ring(struct vmbus_channel *channel) +{ + hv_ringbuffer_cleanup(&channel->outbound); + hv_ringbuffer_cleanup(&channel->inbound); + + if (channel->ringbuffer_page) { + __free_pages(channel->ringbuffer_page, + get_order(channel->ringbuffer_pagecount + << PAGE_SHIFT)); + channel->ringbuffer_page = NULL; + } +} +EXPORT_SYMBOL_GPL(vmbus_free_ring); + +/* vmbus_alloc_ring - allocate and map pages for ring buffer */ +int vmbus_alloc_ring(struct vmbus_channel *newchannel, + u32 send_size, u32 recv_size) +{ + struct page *page; + int order; + + if (send_size % PAGE_SIZE || recv_size % PAGE_SIZE) + return -EINVAL; + + /* Allocate the ring buffer */ + order = get_order(send_size + recv_size); + page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), + GFP_KERNEL|__GFP_ZERO, order); + + if (!page) + page = alloc_pages(GFP_KERNEL|__GFP_ZERO, order); + + if (!page) + return -ENOMEM; + + newchannel->ringbuffer_page = page; + newchannel->ringbuffer_pagecount = (send_size + recv_size) >> PAGE_SHIFT; + newchannel->ringbuffer_send_offset = send_size >> PAGE_SHIFT; + + return 0; +} +EXPORT_SYMBOL_GPL(vmbus_alloc_ring); + +static int __vmbus_open(struct vmbus_channel *newchannel, + void *userdata, u32 userdatalen, + void (*onchannelcallback)(void *context), void *context) { struct vmbus_channel_open_channel *open_msg; struct vmbus_channel_msginfo *open_info = NULL; + struct page *page = newchannel->ringbuffer_page; + u32 send_pages, recv_pages; unsigned long flags; - int ret, err = 0; - struct page *page; + int err; - if (send_ringbuffer_size % PAGE_SIZE || - recv_ringbuffer_size % PAGE_SIZE) + if (userdatalen > MAX_USER_DEFINED_BYTES) return -EINVAL; + send_pages = newchannel->ringbuffer_send_offset; + recv_pages = newchannel->ringbuffer_pagecount - send_pages; + spin_lock_irqsave(&newchannel->lock, flags); - if (newchannel->state == CHANNEL_OPEN_STATE) { - newchannel->state = CHANNEL_OPENING_STATE; - } else { + if (newchannel->state != CHANNEL_OPEN_STATE) { spin_unlock_irqrestore(&newchannel->lock, flags); return -EINVAL; } spin_unlock_irqrestore(&newchannel->lock, flags); + newchannel->state = CHANNEL_OPENING_STATE; newchannel->onchannel_callback = onchannelcallback; newchannel->channel_callback_context = context; - /* Allocate the ring buffer */ - page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), - GFP_KERNEL|__GFP_ZERO, - get_order(send_ringbuffer_size + - recv_ringbuffer_size)); - - if (!page) - page = alloc_pages(GFP_KERNEL|__GFP_ZERO, - get_order(send_ringbuffer_size + - recv_ringbuffer_size)); - - if (!page) { - err = -ENOMEM; - goto error_set_chnstate; - } - - newchannel->ringbuffer_pages = page_address(page); - newchannel->ringbuffer_pagecount = (send_ringbuffer_size + - recv_ringbuffer_size) >> PAGE_SHIFT; - - ret = hv_ringbuffer_init(&newchannel->outbound, page, - send_ringbuffer_size >> PAGE_SHIFT); - - if (ret != 0) { - err = ret; - goto error_free_pages; - } - - ret = hv_ringbuffer_init(&newchannel->inbound, - &page[send_ringbuffer_size >> PAGE_SHIFT], - recv_ringbuffer_size >> PAGE_SHIFT); - if (ret != 0) { - err = ret; - goto error_free_pages; - } + err = hv_ringbuffer_init(&newchannel->outbound, page, send_pages); + if (err) + goto error_clean_ring; + err = hv_ringbuffer_init(&newchannel->inbound, + &page[send_pages], recv_pages); + if (err) + goto error_clean_ring; /* Establish the gpadl for the ring buffer */ newchannel->ringbuffer_gpadlhandle = 0; - ret = vmbus_establish_gpadl(newchannel, - page_address(page), - send_ringbuffer_size + - recv_ringbuffer_size, + err = vmbus_establish_gpadl(newchannel, + page_address(newchannel->ringbuffer_page), + (send_pages + recv_pages) << PAGE_SHIFT, &newchannel->ringbuffer_gpadlhandle); - - if (ret != 0) { - err = ret; - goto error_free_pages; - } + if (err) + goto error_clean_ring; /* Create and init the channel open message */ open_info = kmalloc(sizeof(*open_info) + @@ -176,15 +187,9 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, open_msg->openid = newchannel->offermsg.child_relid; open_msg->child_relid = newchannel->offermsg.child_relid; open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; - open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> - PAGE_SHIFT; + open_msg->downstream_ringbuffer_pageoffset = newchannel->ringbuffer_send_offset; open_msg->target_vp = newchannel->target_vp; - if (userdatalen > MAX_USER_DEFINED_BYTES) { - err = -EINVAL; - goto error_free_gpadl; - } - if (userdatalen) memcpy(open_msg->userdata, userdata, userdatalen); @@ -195,18 +200,16 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, if (newchannel->rescind) { err = -ENODEV; - goto error_free_gpadl; + goto error_free_info; } - ret = vmbus_post_msg(open_msg, + err = vmbus_post_msg(open_msg, sizeof(struct vmbus_channel_open_channel), true); - trace_vmbus_open(open_msg, ret); + trace_vmbus_open(open_msg, err); - if (ret != 0) { - err = ret; + if (err != 0) goto error_clean_msglist; - } wait_for_completion(&open_info->waitevent); @@ -216,12 +219,12 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, if (newchannel->rescind) { err = -ENODEV; - goto error_free_gpadl; + goto error_free_info; } if (open_info->response.open_result.status) { err = -EAGAIN; - goto error_free_gpadl; + goto error_free_info; } newchannel->state = CHANNEL_OPENED_STATE; @@ -232,19 +235,50 @@ error_clean_msglist: spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); list_del(&open_info->msglistentry); spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); - +error_free_info: + kfree(open_info); error_free_gpadl: vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); - kfree(open_info); -error_free_pages: + newchannel->ringbuffer_gpadlhandle = 0; +error_clean_ring: hv_ringbuffer_cleanup(&newchannel->outbound); hv_ringbuffer_cleanup(&newchannel->inbound); - __free_pages(page, - get_order(send_ringbuffer_size + recv_ringbuffer_size)); -error_set_chnstate: newchannel->state = CHANNEL_OPEN_STATE; return err; } + +/* + * vmbus_connect_ring - Open the channel but reuse ring buffer + */ +int vmbus_connect_ring(struct vmbus_channel *newchannel, + void (*onchannelcallback)(void *context), void *context) +{ + return __vmbus_open(newchannel, NULL, 0, onchannelcallback, context); +} +EXPORT_SYMBOL_GPL(vmbus_connect_ring); + +/* + * vmbus_open - Open the specified channel. + */ +int vmbus_open(struct vmbus_channel *newchannel, + u32 send_ringbuffer_size, u32 recv_ringbuffer_size, + void *userdata, u32 userdatalen, + void (*onchannelcallback)(void *context), void *context) +{ + int err; + + err = vmbus_alloc_ring(newchannel, send_ringbuffer_size, + recv_ringbuffer_size); + if (err) + return err; + + err = __vmbus_open(newchannel, userdata, userdatalen, + onchannelcallback, context); + if (err) + vmbus_free_ring(newchannel); + + return err; +} EXPORT_SYMBOL_GPL(vmbus_open); /* Used for Hyper-V Socket: a guest client's connect() to the host */ @@ -612,10 +646,8 @@ static int vmbus_close_internal(struct vmbus_channel *channel) * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): * here we should skip most of the below cleanup work. */ - if (channel->state != CHANNEL_OPENED_STATE) { - ret = -EINVAL; - goto out; - } + if (channel->state != CHANNEL_OPENED_STATE) + return -EINVAL; channel->state = CHANNEL_OPEN_STATE; @@ -637,11 +669,10 @@ static int vmbus_close_internal(struct vmbus_channel *channel) * If we failed to post the close msg, * it is perhaps better to leak memory. */ - goto out; } /* Tear down the gpadl for the channel's ring buffer */ - if (channel->ringbuffer_gpadlhandle) { + else if (channel->ringbuffer_gpadlhandle) { ret = vmbus_teardown_gpadl(channel, channel->ringbuffer_gpadlhandle); if (ret) { @@ -650,74 +681,78 @@ static int vmbus_close_internal(struct vmbus_channel *channel) * If we failed to teardown gpadl, * it is perhaps better to leak memory. */ - goto out; } - } - - /* Cleanup the ring buffers for this channel */ - hv_ringbuffer_cleanup(&channel->outbound); - hv_ringbuffer_cleanup(&channel->inbound); - free_pages((unsigned long)channel->ringbuffer_pages, - get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); + channel->ringbuffer_gpadlhandle = 0; + } -out: return ret; } -/* - * vmbus_close - Close the specified channel - */ -void vmbus_close(struct vmbus_channel *channel) +/* disconnect ring - close all channels */ +int vmbus_disconnect_ring(struct vmbus_channel *channel) { - struct list_head *cur, *tmp; - struct vmbus_channel *cur_channel; + struct vmbus_channel *cur_channel, *tmp; + unsigned long flags; + LIST_HEAD(list); + int ret; - if (channel->primary_channel != NULL) { - /* - * We will only close sub-channels when - * the primary is closed. - */ - return; - } - /* - * Close all the sub-channels first and then close the - * primary channel. - */ - list_for_each_safe(cur, tmp, &channel->sc_list) { - cur_channel = list_entry(cur, struct vmbus_channel, sc_list); - if (cur_channel->rescind) { + if (channel->primary_channel != NULL) + return -EINVAL; + + /* Snapshot the list of subchannels */ + spin_lock_irqsave(&channel->lock, flags); + list_splice_init(&channel->sc_list, &list); + channel->num_sc = 0; + spin_unlock_irqrestore(&channel->lock, flags); + + list_for_each_entry_safe(cur_channel, tmp, &list, sc_list) { + if (cur_channel->rescind) wait_for_completion(&cur_channel->rescind_event); - mutex_lock(&vmbus_connection.channel_mutex); - vmbus_close_internal(cur_channel); - hv_process_channel_removal( - cur_channel->offermsg.child_relid); - } else { - mutex_lock(&vmbus_connection.channel_mutex); - vmbus_close_internal(cur_channel); + + mutex_lock(&vmbus_connection.channel_mutex); + if (vmbus_close_internal(cur_channel) == 0) { + vmbus_free_ring(cur_channel); + + if (cur_channel->rescind) + hv_process_channel_removal(cur_channel); } mutex_unlock(&vmbus_connection.channel_mutex); } + /* * Now close the primary. */ mutex_lock(&vmbus_connection.channel_mutex); - vmbus_close_internal(channel); + ret = vmbus_close_internal(channel); mutex_unlock(&vmbus_connection.channel_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(vmbus_disconnect_ring); + +/* + * vmbus_close - Close the specified channel + */ +void vmbus_close(struct vmbus_channel *channel) +{ + if (vmbus_disconnect_ring(channel) == 0) + vmbus_free_ring(channel); } EXPORT_SYMBOL_GPL(vmbus_close); /** * vmbus_sendpacket() - Send the specified buffer on the given channel - * @channel: Pointer to vmbus_channel structure. - * @buffer: Pointer to the buffer you want to receive the data into. - * @bufferlen: Maximum size of what the the buffer will hold + * @channel: Pointer to vmbus_channel structure + * @buffer: Pointer to the buffer you want to send the data from. + * @bufferlen: Maximum size of what the buffer holds. * @requestid: Identifier of the request - * @type: Type of packet that is being send e.g. negotiate, time - * packet etc. + * @type: Type of packet that is being sent e.g. negotiate, time + * packet etc. + * @flags: 0 or VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED * - * Sends data in @buffer directly to hyper-v via the vmbus - * This will send the data unparsed to hyper-v. + * Sends data in @buffer directly to Hyper-V via the vmbus. + * This will send the data unparsed to Hyper-V. * * Mainly used by Hyper-V drivers. */ @@ -850,12 +885,13 @@ int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); /** - * vmbus_recvpacket() - Retrieve the user packet on the specified channel - * @channel: Pointer to vmbus_channel structure. + * __vmbus_recvpacket() - Retrieve the user packet on the specified channel + * @channel: Pointer to vmbus_channel structure * @buffer: Pointer to the buffer you want to receive the data into. - * @bufferlen: Maximum size of what the the buffer will hold - * @buffer_actual_len: The actual size of the data after it was received + * @bufferlen: Maximum size of what the buffer can hold. + * @buffer_actual_len: The actual size of the data after it was received. * @requestid: Identifier of the request + * @raw: true means keep the vmpacket_descriptor header in the received data. * * Receives directly from the hyper-v vmbus and puts the data it received * into Buffer. This will receive the data unparsed from hyper-v. diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c @@ -198,24 +198,19 @@ static u16 hv_get_dev_type(const struct vmbus_channel *channel) } /** - * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message + * vmbus_prep_negotiate_resp() - Create default response for Negotiate message * @icmsghdrp: Pointer to msg header structure - * @icmsg_negotiate: Pointer to negotiate message structure * @buf: Raw buffer channel data + * @fw_version: The framework versions we can support. + * @fw_vercnt: The size of @fw_version. + * @srv_version: The service versions we can support. + * @srv_vercnt: The size of @srv_version. + * @nego_fw_version: The selected framework version. + * @nego_srv_version: The selected service version. * - * @icmsghdrp is of type &struct icmsg_hdr. - * Set up and fill in default negotiate response message. - * - * The fw_version and fw_vercnt specifies the framework version that - * we can support. - * - * The srv_version and srv_vercnt specifies the service - * versions we can support. - * - * Versions are given in decreasing order. - * - * nego_fw_version and nego_srv_version store the selected protocol versions. + * Note: Versions are given in decreasing order. * + * Set up and fill in default negotiate response message. * Mainly used by Hyper-V drivers. */ bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, @@ -385,21 +380,14 @@ static void vmbus_release_relid(u32 relid) trace_vmbus_release_relid(&msg, ret); } -void hv_process_channel_removal(u32 relid) +void hv_process_channel_removal(struct vmbus_channel *channel) { + struct vmbus_channel *primary_channel; unsigned long flags; - struct vmbus_channel *primary_channel, *channel; BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); - - /* - * Make sure channel is valid as we may have raced. - */ - channel = relid2channel(relid); - if (!channel) - return; - BUG_ON(!channel->rescind); + if (channel->target_cpu != get_cpu()) { put_cpu(); smp_call_function_single(channel->target_cpu, @@ -429,7 +417,7 @@ void hv_process_channel_removal(u32 relid) cpumask_clear_cpu(channel->target_cpu, &primary_channel->alloced_cpus_in_node); - vmbus_release_relid(relid); + vmbus_release_relid(channel->offermsg.child_relid); free_channel(channel); } @@ -606,16 +594,18 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) bool perf_chn = vmbus_devs[dev_type].perf_device; struct vmbus_channel *primary = channel->primary_channel; int next_node; - struct cpumask available_mask; + cpumask_var_t available_mask; struct cpumask *alloced_mask; if ((vmbus_proto_version == VERSION_WS2008) || - (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { + (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || + !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { /* * Prior to win8, all channel interrupts are * delivered on cpu 0. * Also if the channel is not a performance critical * channel, bind it to cpu 0. + * In case alloc_cpumask_var() fails, bind it to cpu 0. */ channel->numa_node = 0; channel->target_cpu = 0; @@ -653,7 +643,7 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) cpumask_clear(alloced_mask); } - cpumask_xor(&available_mask, alloced_mask, + cpumask_xor(available_mask, alloced_mask, cpumask_of_node(primary->numa_node)); cur_cpu = -1; @@ -671,10 +661,10 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) } while (true) { - cur_cpu = cpumask_next(cur_cpu, &available_mask); + cur_cpu = cpumask_next(cur_cpu, available_mask); if (cur_cpu >= nr_cpu_ids) { cur_cpu = -1; - cpumask_copy(&available_mask, + cpumask_copy(available_mask, cpumask_of_node(primary->numa_node)); continue; } @@ -704,6 +694,8 @@ static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) channel->target_cpu = cur_cpu; channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); + + free_cpumask_var(available_mask); } static void vmbus_wait_for_unload(void) @@ -943,7 +935,7 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) * The channel is currently not open; * it is safe for us to cleanup the channel. */ - hv_process_channel_removal(rescind->child_relid); + hv_process_channel_removal(channel); } else { complete(&channel->rescind_event); } diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c @@ -189,6 +189,17 @@ static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu) int hv_synic_alloc(void) { int cpu; + struct hv_per_cpu_context *hv_cpu; + + /* + * First, zero all per-cpu memory areas so hv_synic_free() can + * detect what memory has been allocated and cleanup properly + * after any failures. + */ + for_each_present_cpu(cpu) { + hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); + memset(hv_cpu, 0, sizeof(*hv_cpu)); + } hv_context.hv_numa_map = kcalloc(nr_node_ids, sizeof(struct cpumask), GFP_KERNEL); @@ -198,10 +209,8 @@ int hv_synic_alloc(void) } for_each_present_cpu(cpu) { - struct hv_per_cpu_context *hv_cpu - = per_cpu_ptr(hv_context.cpu_context, cpu); + hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); - memset(hv_cpu, 0, sizeof(*hv_cpu)); tasklet_init(&hv_cpu->msg_dpc, vmbus_on_msg_dpc, (unsigned long) hv_cpu); diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c @@ -689,7 +689,7 @@ static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) __online_page_increment_counters(pg); __online_page_free(pg); - WARN_ON_ONCE(!spin_is_locked(&dm_device.ha_lock)); + lockdep_assert_held(&dm_device.ha_lock); dm_device.num_pages_onlined++; } diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c @@ -353,7 +353,6 @@ static void process_ib_ipinfo(void *in_msg, void *out_msg, int op) out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled; - default: utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id, MAX_ADAPTER_ID_SIZE, UTF16_LITTLE_ENDIAN, @@ -406,7 +405,7 @@ kvp_send_key(struct work_struct *dummy) process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO); break; case KVP_OP_GET_IP_INFO: - process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO); + /* We only need to pass on message->kvp_hdr.operation. */ break; case KVP_OP_SET: switch (in_msg->body.kvp_set.data.value_type) { @@ -421,7 +420,7 @@ kvp_send_key(struct work_struct *dummy) UTF16_LITTLE_ENDIAN, message->body.kvp_set.data.value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE - 1) + 1; - break; + break; case REG_U32: /* @@ -446,6 +445,9 @@ kvp_send_key(struct work_struct *dummy) break; } + + break; + case KVP_OP_GET: message->body.kvp_set.data.key_size = utf16s_to_utf8s( @@ -454,7 +456,7 @@ kvp_send_key(struct work_struct *dummy) UTF16_LITTLE_ENDIAN, message->body.kvp_set.data.key, HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; - break; + break; case KVP_OP_DELETE: message->body.kvp_delete.key_size = @@ -464,12 +466,12 @@ kvp_send_key(struct work_struct *dummy) UTF16_LITTLE_ENDIAN, message->body.kvp_delete.key, HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1; - break; + break; case KVP_OP_ENUMERATE: message->body.kvp_enum_data.index = in_msg->body.kvp_enum_data.index; - break; + break; } kvp_transaction.state = HVUTIL_USERSPACE_REQ; diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c @@ -241,6 +241,7 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info) { vunmap(ring_info->ring_buffer); + ring_info->ring_buffer = NULL; } /* Write to the ring buffer. */ diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c @@ -498,6 +498,54 @@ static ssize_t device_show(struct device *dev, } static DEVICE_ATTR_RO(device); +static ssize_t driver_override_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct hv_device *hv_dev = device_to_hv_device(dev); + char *driver_override, *old, *cp; + + /* We need to keep extra room for a newline */ + if (count >= (PAGE_SIZE - 1)) + return -EINVAL; + + driver_override = kstrndup(buf, count, GFP_KERNEL); + if (!driver_override) + return -ENOMEM; + + cp = strchr(driver_override, '\n'); + if (cp) + *cp = '\0'; + + device_lock(dev); + old = hv_dev->driver_override; + if (strlen(driver_override)) { + hv_dev->driver_override = driver_override; + } else { + kfree(driver_override); + hv_dev->driver_override = NULL; + } + device_unlock(dev); + + kfree(old); + + return count; +} + +static ssize_t driver_override_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct hv_device *hv_dev = device_to_hv_device(dev); + ssize_t len; + + device_lock(dev); + len = snprintf(buf, PAGE_SIZE, "%s\n", hv_dev->driver_override); + device_unlock(dev); + + return len; +} +static DEVICE_ATTR_RW(driver_override); + /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ static struct attribute *vmbus_dev_attrs[] = { &dev_attr_id.attr, @@ -528,6 +576,7 @@ static struct attribute *vmbus_dev_attrs[] = { &dev_attr_channel_vp_mapping.attr, &dev_attr_vendor.attr, &dev_attr_device.attr, + &dev_attr_driver_override.attr, NULL, }; ATTRIBUTE_GROUPS(vmbus_dev); @@ -563,17 +612,26 @@ static inline bool is_null_guid(const uuid_le *guid) return true; } -/* - * Return a matching hv_vmbus_device_id pointer. - * If there is no match, return NULL. - */ -static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, - const uuid_le *guid) +static const struct hv_vmbus_device_id * +hv_vmbus_dev_match(const struct hv_vmbus_device_id *id, const uuid_le *guid) + +{ + if (id == NULL) + return NULL; /* empty device table */ + + for (; !is_null_guid(&id->guid); id++) + if (!uuid_le_cmp(id->guid, *guid)) + return id; + + return NULL; +} + +static const struct hv_vmbus_device_id * +hv_vmbus_dynid_match(struct hv_driver *drv, const uuid_le *guid) { const struct hv_vmbus_device_id *id = NULL; struct vmbus_dynid *dynid; - /* Look at the dynamic ids first, before the static ones */ spin_lock(&drv->dynids.lock); list_for_each_entry(dynid, &drv->dynids.list, node) { if (!uuid_le_cmp(dynid->id.guid, *guid)) { @@ -583,18 +641,37 @@ static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, } spin_unlock(&drv->dynids.lock); - if (id) - return id; + return id; +} - id = drv->id_table; - if (id == NULL) - return NULL; /* empty device table */ +static const struct hv_vmbus_device_id vmbus_device_null = { + .guid = NULL_UUID_LE, +}; - for (; !is_null_guid(&id->guid); id++) - if (!uuid_le_cmp(id->guid, *guid)) - return id; +/* + * Return a matching hv_vmbus_device_id pointer. + * If there is no match, return NULL. + */ +static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, + struct hv_device *dev) +{ + const uuid_le *guid = &dev->dev_type; + const struct hv_vmbus_device_id *id; - return NULL; + /* When driver_override is set, only bind to the matching driver */ + if (dev->driver_override && strcmp(dev->driver_override, drv->name)) + return NULL; + + /* Look at the dynamic ids first, before the static ones */ + id = hv_vmbus_dynid_match(drv, guid); + if (!id) + id = hv_vmbus_dev_match(drv->id_table, guid); + + /* driver_override will always match, send a dummy id */ + if (!id && dev->driver_override) + id = &vmbus_device_null; + + return id; } /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */ @@ -643,7 +720,7 @@ static ssize_t new_id_store(struct device_driver *driver, const char *buf, if (retval) return retval; - if (hv_vmbus_get_id(drv, &guid)) + if (hv_vmbus_dynid_match(drv, &guid)) return -EEXIST; retval = vmbus_add_dynid(drv, &guid); @@ -708,7 +785,7 @@ static int vmbus_match(struct device *device, struct device_driver *driver) if (is_hvsock_channel(hv_dev->channel)) return drv->hvsock; - if (hv_vmbus_get_id(drv, &hv_dev->dev_type)) + if (hv_vmbus_get_id(drv, hv_dev)) return 1; return 0; @@ -725,7 +802,7 @@ static int vmbus_probe(struct device *child_device) struct hv_device *dev = device_to_hv_device(child_device); const struct hv_vmbus_device_id *dev_id; - dev_id = hv_vmbus_get_id(drv, &dev->dev_type); + dev_id = hv_vmbus_get_id(drv, dev); if (drv->probe) { ret = drv->probe(dev, dev_id); if (ret != 0) @@ -787,10 +864,9 @@ static void vmbus_device_release(struct device *device) struct vmbus_channel *channel = hv_dev->channel; mutex_lock(&vmbus_connection.channel_mutex); - hv_process_channel_removal(channel->offermsg.child_relid); + hv_process_channel_removal(channel); mutex_unlock(&vmbus_connection.channel_mutex); kfree(hv_dev); - } /* The one and only one */ diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c @@ -406,6 +406,7 @@ static inline int catu_wait_for_ready(struct catu_drvdata *drvdata) static int catu_enable_hw(struct catu_drvdata *drvdata, void *data) { + int rc; u32 control, mode; struct etr_buf *etr_buf = data; @@ -418,6 +419,10 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data) return -EBUSY; } + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + return rc; + control |= BIT(CATU_CONTROL_ENABLE); if (etr_buf && etr_buf->mode == ETR_MODE_CATU) { @@ -459,6 +464,7 @@ static int catu_disable_hw(struct catu_drvdata *drvdata) int rc = 0; catu_write_control(drvdata, 0); + coresight_disclaim_device_unlocked(drvdata->base); if (catu_wait_for_ready(drvdata)) { dev_info(drvdata->dev, "Timeout while waiting for READY\n"); rc = -EAGAIN; diff --git a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c @@ -34,48 +34,87 @@ struct replicator_state { struct coresight_device *csdev; }; +/* + * replicator_reset : Reset the replicator configuration to sane values. + */ +static void replicator_reset(struct replicator_state *drvdata) +{ + CS_UNLOCK(drvdata->base); + + if (!coresight_claim_device_unlocked(drvdata->base)) { + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + coresight_disclaim_device_unlocked(drvdata->base); + } + + CS_LOCK(drvdata->base); +} + static int replicator_enable(struct coresight_device *csdev, int inport, int outport) { + int rc = 0; + u32 reg; struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + switch (outport) { + case 0: + reg = REPLICATOR_IDFILTER0; + break; + case 1: + reg = REPLICATOR_IDFILTER1; + break; + default: + WARN_ON(1); + return -EINVAL; + } + CS_UNLOCK(drvdata->base); - /* - * Ensure that the other port is disabled - * 0x00 - passing through the replicator unimpeded - * 0xff - disable (or impede) the flow of ATB data - */ - if (outport == 0) { - writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0); - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); - } else { - writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1); - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) && + (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff)) + rc = coresight_claim_device_unlocked(drvdata->base); + + /* Ensure that the outport is enabled. */ + if (!rc) { + writel_relaxed(0x00, drvdata->base + reg); + dev_dbg(drvdata->dev, "REPLICATOR enabled\n"); } CS_LOCK(drvdata->base); - dev_info(drvdata->dev, "REPLICATOR enabled\n"); - return 0; + return rc; } static void replicator_disable(struct coresight_device *csdev, int inport, int outport) { + u32 reg; struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + switch (outport) { + case 0: + reg = REPLICATOR_IDFILTER0; + break; + case 1: + reg = REPLICATOR_IDFILTER1; + break; + default: + WARN_ON(1); + return; + } + CS_UNLOCK(drvdata->base); /* disable the flow of ATB data through port */ - if (outport == 0) - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); - else - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + writel_relaxed(0xff, drvdata->base + reg); + if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) && + (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff)) + coresight_disclaim_device_unlocked(drvdata->base); CS_LOCK(drvdata->base); - dev_info(drvdata->dev, "REPLICATOR disabled\n"); + dev_dbg(drvdata->dev, "REPLICATOR disabled\n"); } static const struct coresight_ops_link replicator_link_ops = { @@ -156,7 +195,11 @@ static int replicator_probe(struct amba_device *adev, const struct amba_id *id) desc.groups = replicator_groups; drvdata->csdev = coresight_register(&desc); - return PTR_ERR_OR_ZERO(drvdata->csdev); + if (!IS_ERR(drvdata->csdev)) { + replicator_reset(drvdata); + return 0; + } + return PTR_ERR(drvdata->csdev); } #ifdef CONFIG_PM diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c @@ -5,7 +5,6 @@ * Description: CoreSight Embedded Trace Buffer driver */ -#include <asm/local.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> @@ -28,6 +27,7 @@ #include "coresight-priv.h" +#include "coresight-etm-perf.h" #define ETB_RAM_DEPTH_REG 0x004 #define ETB_STATUS_REG 0x00c @@ -71,8 +71,8 @@ * @miscdev: specifics to handle "/dev/xyz.etb" entry. * @spinlock: only one at a time pls. * @reading: synchronise user space access to etb buffer. - * @mode: this ETB is being used. * @buf: area of memory where ETB buffer content gets sent. + * @mode: this ETB is being used. * @buffer_depth: size of @buf. * @trigger_cntr: amount of words to store after a trigger. */ @@ -84,12 +84,15 @@ struct etb_drvdata { struct miscdevice miscdev; spinlock_t spinlock; local_t reading; - local_t mode; u8 *buf; + u32 mode; u32 buffer_depth; u32 trigger_cntr; }; +static int etb_set_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle); + static unsigned int etb_get_buffer_depth(struct etb_drvdata *drvdata) { u32 depth = 0; @@ -103,7 +106,7 @@ static unsigned int etb_get_buffer_depth(struct etb_drvdata *drvdata) return depth; } -static void etb_enable_hw(struct etb_drvdata *drvdata) +static void __etb_enable_hw(struct etb_drvdata *drvdata) { int i; u32 depth; @@ -131,32 +134,92 @@ static void etb_enable_hw(struct etb_drvdata *drvdata) CS_LOCK(drvdata->base); } -static int etb_enable(struct coresight_device *csdev, u32 mode) +static int etb_enable_hw(struct etb_drvdata *drvdata) +{ + __etb_enable_hw(drvdata); + return 0; +} + +static int etb_enable_sysfs(struct coresight_device *csdev) { - u32 val; + int ret = 0; unsigned long flags; struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - val = local_cmpxchg(&drvdata->mode, - CS_MODE_DISABLED, mode); - /* - * When accessing from Perf, a HW buffer can be handled - * by a single trace entity. In sysFS mode many tracers - * can be logging to the same HW buffer. - */ - if (val == CS_MODE_PERF) - return -EBUSY; + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* Don't messup with perf sessions. */ + if (drvdata->mode == CS_MODE_PERF) { + ret = -EBUSY; + goto out; + } /* Nothing to do, the tracer is already enabled. */ - if (val == CS_MODE_SYSFS) + if (drvdata->mode == CS_MODE_SYSFS) goto out; - spin_lock_irqsave(&drvdata->spinlock, flags); - etb_enable_hw(drvdata); + ret = etb_enable_hw(drvdata); + if (!ret) + drvdata->mode = CS_MODE_SYSFS; + +out: spin_unlock_irqrestore(&drvdata->spinlock, flags); + return ret; +} + +static int etb_enable_perf(struct coresight_device *csdev, void *data) +{ + int ret = 0; + unsigned long flags; + struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* No need to continue if the component is already in use. */ + if (drvdata->mode != CS_MODE_DISABLED) { + ret = -EBUSY; + goto out; + } + + /* + * We don't have an internal state to clean up if we fail to setup + * the perf buffer. So we can perform the step before we turn the + * ETB on and leave without cleaning up. + */ + ret = etb_set_buffer(csdev, (struct perf_output_handle *)data); + if (ret) + goto out; + + ret = etb_enable_hw(drvdata); + if (!ret) + drvdata->mode = CS_MODE_PERF; out: - dev_info(drvdata->dev, "ETB enabled\n"); + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return ret; +} + +static int etb_enable(struct coresight_device *csdev, u32 mode, void *data) +{ + int ret; + struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + switch (mode) { + case CS_MODE_SYSFS: + ret = etb_enable_sysfs(csdev); + break; + case CS_MODE_PERF: + ret = etb_enable_perf(csdev, data); + break; + default: + ret = -EINVAL; + break; + } + + if (ret) + return ret; + + dev_dbg(drvdata->dev, "ETB enabled\n"); return 0; } @@ -256,13 +319,16 @@ static void etb_disable(struct coresight_device *csdev) unsigned long flags; spin_lock_irqsave(&drvdata->spinlock, flags); - etb_disable_hw(drvdata); - etb_dump_hw(drvdata); - spin_unlock_irqrestore(&drvdata->spinlock, flags); - local_set(&drvdata->mode, CS_MODE_DISABLED); + /* Disable the ETB only if it needs to */ + if (drvdata->mode != CS_MODE_DISABLED) { + etb_disable_hw(drvdata); + etb_dump_hw(drvdata); + drvdata->mode = CS_MODE_DISABLED; + } + spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "ETB disabled\n"); + dev_dbg(drvdata->dev, "ETB disabled\n"); } static void *etb_alloc_buffer(struct coresight_device *csdev, int cpu, @@ -294,12 +360,14 @@ static void etb_free_buffer(void *config) } static int etb_set_buffer(struct coresight_device *csdev, - struct perf_output_handle *handle, - void *sink_config) + struct perf_output_handle *handle) { int ret = 0; unsigned long head; - struct cs_buffers *buf = sink_config; + struct cs_buffers *buf = etm_perf_sink_config(handle); + + if (!buf) + return -EINVAL; /* wrap head around to the amount of space we have */ head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); @@ -315,37 +383,7 @@ static int etb_set_buffer(struct coresight_device *csdev, return ret; } -static unsigned long etb_reset_buffer(struct coresight_device *csdev, - struct perf_output_handle *handle, - void *sink_config) -{ - unsigned long size = 0; - struct cs_buffers *buf = sink_config; - - if (buf) { - /* - * In snapshot mode ->data_size holds the new address of the - * ring buffer's head. The size itself is the whole address - * range since we want the latest information. - */ - if (buf->snapshot) - handle->head = local_xchg(&buf->data_size, - buf->nr_pages << PAGE_SHIFT); - - /* - * Tell the tracer PMU how much we got in this run and if - * something went wrong along the way. Nobody else can use - * this cs_buffers instance until we are done. As such - * resetting parameters here and squaring off with the ring - * buffer API in the tracer PMU is fine. - */ - size = local_xchg(&buf->data_size, 0); - } - - return size; -} - -static void etb_update_buffer(struct coresight_device *csdev, +static unsigned long etb_update_buffer(struct coresight_device *csdev, struct perf_output_handle *handle, void *sink_config) { @@ -354,13 +392,13 @@ static void etb_update_buffer(struct coresight_device *csdev, u8 *buf_ptr; const u32 *barrier; u32 read_ptr, write_ptr, capacity; - u32 status, read_data, to_read; - unsigned long offset; + u32 status, read_data; + unsigned long offset, to_read; struct cs_buffers *buf = sink_config; struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); if (!buf) - return; + return 0; capacity = drvdata->buffer_depth * ETB_FRAME_SIZE_WORDS; @@ -465,18 +503,17 @@ static void etb_update_buffer(struct coresight_device *csdev, writel_relaxed(0x0, drvdata->base + ETB_RAM_WRITE_POINTER); /* - * In snapshot mode all we have to do is communicate to - * perf_aux_output_end() the address of the current head. In full - * trace mode the same function expects a size to move rb->aux_head - * forward. + * In snapshot mode we have to update the handle->head to point + * to the new location. */ - if (buf->snapshot) - local_set(&buf->data_size, (cur * PAGE_SIZE) + offset); - else - local_add(to_read, &buf->data_size); - + if (buf->snapshot) { + handle->head = (cur * PAGE_SIZE) + offset; + to_read = buf->nr_pages << PAGE_SHIFT; + } etb_enable_hw(drvdata); CS_LOCK(drvdata->base); + + return to_read; } static const struct coresight_ops_sink etb_sink_ops = { @@ -484,8 +521,6 @@ static const struct coresight_ops_sink etb_sink_ops = { .disable = etb_disable, .alloc_buffer = etb_alloc_buffer, .free_buffer = etb_free_buffer, - .set_buffer = etb_set_buffer, - .reset_buffer = etb_reset_buffer, .update_buffer = etb_update_buffer, }; @@ -498,14 +533,14 @@ static void etb_dump(struct etb_drvdata *drvdata) unsigned long flags; spin_lock_irqsave(&drvdata->spinlock, flags); - if (local_read(&drvdata->mode) == CS_MODE_SYSFS) { + if (drvdata->mode == CS_MODE_SYSFS) { etb_disable_hw(drvdata); etb_dump_hw(drvdata); etb_enable_hw(drvdata); } spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "ETB dumped\n"); + dev_dbg(drvdata->dev, "ETB dumped\n"); } static int etb_open(struct inode *inode, struct file *file) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -12,6 +12,7 @@ #include <linux/mm.h> #include <linux/init.h> #include <linux/perf_event.h> +#include <linux/percpu-defs.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/workqueue.h> @@ -22,20 +23,6 @@ static struct pmu etm_pmu; static bool etm_perf_up; -/** - * struct etm_event_data - Coresight specifics associated to an event - * @work: Handle to free allocated memory outside IRQ context. - * @mask: Hold the CPU(s) this event was set for. - * @snk_config: The sink configuration. - * @path: An array of path, each slot for one CPU. - */ -struct etm_event_data { - struct work_struct work; - cpumask_t mask; - void *snk_config; - struct list_head **path; -}; - static DEFINE_PER_CPU(struct perf_output_handle, ctx_handle); static DEFINE_PER_CPU(struct coresight_device *, csdev_src); @@ -61,6 +48,18 @@ static const struct attribute_group *etm_pmu_attr_groups[] = { NULL, }; +static inline struct list_head ** +etm_event_cpu_path_ptr(struct etm_event_data *data, int cpu) +{ + return per_cpu_ptr(data->path, cpu); +} + +static inline struct list_head * +etm_event_cpu_path(struct etm_event_data *data, int cpu) +{ + return *etm_event_cpu_path_ptr(data, cpu); +} + static void etm_event_read(struct perf_event *event) {} static int etm_addr_filters_alloc(struct perf_event *event) @@ -114,29 +113,30 @@ static void free_event_data(struct work_struct *work) event_data = container_of(work, struct etm_event_data, work); mask = &event_data->mask; - /* - * First deal with the sink configuration. See comment in - * etm_setup_aux() about why we take the first available path. - */ - if (event_data->snk_config) { + + /* Free the sink buffers, if there are any */ + if (event_data->snk_config && !WARN_ON(cpumask_empty(mask))) { cpu = cpumask_first(mask); - sink = coresight_get_sink(event_data->path[cpu]); + sink = coresight_get_sink(etm_event_cpu_path(event_data, cpu)); if (sink_ops(sink)->free_buffer) sink_ops(sink)->free_buffer(event_data->snk_config); } for_each_cpu(cpu, mask) { - if (!(IS_ERR_OR_NULL(event_data->path[cpu]))) - coresight_release_path(event_data->path[cpu]); + struct list_head **ppath; + + ppath = etm_event_cpu_path_ptr(event_data, cpu); + if (!(IS_ERR_OR_NULL(*ppath))) + coresight_release_path(*ppath); + *ppath = NULL; } - kfree(event_data->path); + free_percpu(event_data->path); kfree(event_data); } static void *alloc_event_data(int cpu) { - int size; cpumask_t *mask; struct etm_event_data *event_data; @@ -145,16 +145,12 @@ static void *alloc_event_data(int cpu) if (!event_data) return NULL; - /* Make sure nothing disappears under us */ - get_online_cpus(); - size = num_online_cpus(); mask = &event_data->mask; if (cpu != -1) cpumask_set_cpu(cpu, mask); else - cpumask_copy(mask, cpu_online_mask); - put_online_cpus(); + cpumask_copy(mask, cpu_present_mask); /* * Each CPU has a single path between source and destination. As such @@ -164,8 +160,8 @@ static void *alloc_event_data(int cpu) * unused memory when dealing with single CPU trace scenarios is small * compared to the cost of searching through an optimized array. */ - event_data->path = kcalloc(size, - sizeof(struct list_head *), GFP_KERNEL); + event_data->path = alloc_percpu(struct list_head *); + if (!event_data->path) { kfree(event_data); return NULL; @@ -206,34 +202,53 @@ static void *etm_setup_aux(int event_cpu, void **pages, * on the cmd line. As such the "enable_sink" flag in sysFS is reset. */ sink = coresight_get_enabled_sink(true); - if (!sink) + if (!sink || !sink_ops(sink)->alloc_buffer) goto err; mask = &event_data->mask; - /* Setup the path for each CPU in a trace session */ + /* + * Setup the path for each CPU in a trace session. We try to build + * trace path for each CPU in the mask. If we don't find an ETM + * for the CPU or fail to build a path, we clear the CPU from the + * mask and continue with the rest. If ever we try to trace on those + * CPUs, we can handle it and fail the session. + */ for_each_cpu(cpu, mask) { + struct list_head *path; struct coresight_device *csdev; csdev = per_cpu(csdev_src, cpu); - if (!csdev) - goto err; + /* + * If there is no ETM associated with this CPU clear it from + * the mask and continue with the rest. If ever we try to trace + * on this CPU, we handle it accordingly. + */ + if (!csdev) { + cpumask_clear_cpu(cpu, mask); + continue; + } /* * Building a path doesn't enable it, it simply builds a * list of devices from source to sink that can be * referenced later when the path is actually needed. */ - event_data->path[cpu] = coresight_build_path(csdev, sink); - if (IS_ERR(event_data->path[cpu])) - goto err; + path = coresight_build_path(csdev, sink); + if (IS_ERR(path)) { + cpumask_clear_cpu(cpu, mask); + continue; + } + + *etm_event_cpu_path_ptr(event_data, cpu) = path; } - if (!sink_ops(sink)->alloc_buffer) + /* If we don't have any CPUs ready for tracing, abort */ + cpu = cpumask_first(mask); + if (cpu >= nr_cpu_ids) goto err; - cpu = cpumask_first(mask); - /* Get the AUX specific data from the sink buffer */ + /* Allocate the sink buffer for this session */ event_data->snk_config = sink_ops(sink)->alloc_buffer(sink, cpu, pages, nr_pages, overwrite); @@ -255,6 +270,7 @@ static void etm_event_start(struct perf_event *event, int flags) struct etm_event_data *event_data; struct perf_output_handle *handle = this_cpu_ptr(&ctx_handle); struct coresight_device *sink, *csdev = per_cpu(csdev_src, cpu); + struct list_head *path; if (!csdev) goto fail; @@ -267,18 +283,14 @@ static void etm_event_start(struct perf_event *event, int flags) if (!event_data) goto fail; + path = etm_event_cpu_path(event_data, cpu); /* We need a sink, no need to continue without one */ - sink = coresight_get_sink(event_data->path[cpu]); - if (WARN_ON_ONCE(!sink || !sink_ops(sink)->set_buffer)) - goto fail_end_stop; - - /* Configure the sink */ - if (sink_ops(sink)->set_buffer(sink, handle, - event_data->snk_config)) + sink = coresight_get_sink(path); + if (WARN_ON_ONCE(!sink)) goto fail_end_stop; /* Nothing will happen without a path */ - if (coresight_enable_path(event_data->path[cpu], CS_MODE_PERF)) + if (coresight_enable_path(path, CS_MODE_PERF, handle)) goto fail_end_stop; /* Tell the perf core the event is alive */ @@ -286,11 +298,13 @@ static void etm_event_start(struct perf_event *event, int flags) /* Finally enable the tracer */ if (source_ops(csdev)->enable(csdev, event, CS_MODE_PERF)) - goto fail_end_stop; + goto fail_disable_path; out: return; +fail_disable_path: + coresight_disable_path(path); fail_end_stop: perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); perf_aux_output_end(handle, 0); @@ -306,6 +320,7 @@ static void etm_event_stop(struct perf_event *event, int mode) struct coresight_device *sink, *csdev = per_cpu(csdev_src, cpu); struct perf_output_handle *handle = this_cpu_ptr(&ctx_handle); struct etm_event_data *event_data = perf_get_aux(handle); + struct list_head *path; if (event->hw.state == PERF_HES_STOPPED) return; @@ -313,7 +328,11 @@ static void etm_event_stop(struct perf_event *event, int mode) if (!csdev) return; - sink = coresight_get_sink(event_data->path[cpu]); + path = etm_event_cpu_path(event_data, cpu); + if (!path) + return; + + sink = coresight_get_sink(path); if (!sink) return; @@ -331,20 +350,13 @@ static void etm_event_stop(struct perf_event *event, int mode) if (!sink_ops(sink)->update_buffer) return; - sink_ops(sink)->update_buffer(sink, handle, + size = sink_ops(sink)->update_buffer(sink, handle, event_data->snk_config); - - if (!sink_ops(sink)->reset_buffer) - return; - - size = sink_ops(sink)->reset_buffer(sink, handle, - event_data->snk_config); - perf_aux_output_end(handle, size); } /* Disabling the path make its elements available to other sessions */ - coresight_disable_path(event_data->path[cpu]); + coresight_disable_path(path); } static int etm_event_add(struct perf_event *event, int mode) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h @@ -7,6 +7,7 @@ #ifndef _CORESIGHT_ETM_PERF_H #define _CORESIGHT_ETM_PERF_H +#include <linux/percpu-defs.h> #include "coresight-priv.h" struct coresight_device; @@ -42,14 +43,39 @@ struct etm_filters { bool ssstatus; }; +/** + * struct etm_event_data - Coresight specifics associated to an event + * @work: Handle to free allocated memory outside IRQ context. + * @mask: Hold the CPU(s) this event was set for. + * @snk_config: The sink configuration. + * @path: An array of path, each slot for one CPU. + */ +struct etm_event_data { + struct work_struct work; + cpumask_t mask; + void *snk_config; + struct list_head * __percpu *path; +}; #ifdef CONFIG_CORESIGHT int etm_perf_symlink(struct coresight_device *csdev, bool link); +static inline void *etm_perf_sink_config(struct perf_output_handle *handle) +{ + struct etm_event_data *data = perf_get_aux(handle); + if (data) + return data->snk_config; + return NULL; +} #else static inline int etm_perf_symlink(struct coresight_device *csdev, bool link) { return -EINVAL; } +static inline void *etm_perf_sink_config(struct perf_output_handle *handle) +{ + return NULL; +} + #endif /* CONFIG_CORESIGHT */ #endif diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -355,11 +355,10 @@ static int etm_parse_event_config(struct etm_drvdata *drvdata, return 0; } -static void etm_enable_hw(void *info) +static int etm_enable_hw(struct etm_drvdata *drvdata) { - int i; + int i, rc; u32 etmcr; - struct etm_drvdata *drvdata = info; struct etm_config *config = &drvdata->config; CS_UNLOCK(drvdata->base); @@ -370,6 +369,9 @@ static void etm_enable_hw(void *info) etm_set_pwrup(drvdata); /* Make sure all registers are accessible */ etm_os_unlock(drvdata); + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + goto done; etm_set_prog(drvdata); @@ -418,9 +420,29 @@ static void etm_enable_hw(void *info) etm_writel(drvdata, 0x0, ETMVMIDCVR); etm_clr_prog(drvdata); + +done: + if (rc) + etm_set_pwrdwn(drvdata); CS_LOCK(drvdata->base); - dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu); + dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n", + drvdata->cpu, rc); + return rc; +} + +struct etm_enable_arg { + struct etm_drvdata *drvdata; + int rc; +}; + +static void etm_enable_hw_smp_call(void *info) +{ + struct etm_enable_arg *arg = info; + + if (WARN_ON(!arg)) + return; + arg->rc = etm_enable_hw(arg->drvdata); } static int etm_cpu_id(struct coresight_device *csdev) @@ -475,14 +497,13 @@ static int etm_enable_perf(struct coresight_device *csdev, /* Configure the tracer based on the session's specifics */ etm_parse_event_config(drvdata, event); /* And enable it */ - etm_enable_hw(drvdata); - - return 0; + return etm_enable_hw(drvdata); } static int etm_enable_sysfs(struct coresight_device *csdev) { struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct etm_enable_arg arg = { 0 }; int ret; spin_lock(&drvdata->spinlock); @@ -492,20 +513,21 @@ static int etm_enable_sysfs(struct coresight_device *csdev) * hw configuration will take place on the local CPU during bring up. */ if (cpu_online(drvdata->cpu)) { + arg.drvdata = drvdata; ret = smp_call_function_single(drvdata->cpu, - etm_enable_hw, drvdata, 1); - if (ret) - goto err; + etm_enable_hw_smp_call, &arg, 1); + if (!ret) + ret = arg.rc; + if (!ret) + drvdata->sticky_enable = true; + } else { + ret = -ENODEV; } - drvdata->sticky_enable = true; spin_unlock(&drvdata->spinlock); - dev_info(drvdata->dev, "ETM tracing enabled\n"); - return 0; - -err: - spin_unlock(&drvdata->spinlock); + if (!ret) + dev_dbg(drvdata->dev, "ETM tracing enabled\n"); return ret; } @@ -555,6 +577,8 @@ static void etm_disable_hw(void *info) for (i = 0; i < drvdata->nr_cntr; i++) config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i)); + coresight_disclaim_device_unlocked(drvdata->base); + etm_set_pwrdwn(drvdata); CS_LOCK(drvdata->base); @@ -604,7 +628,7 @@ static void etm_disable_sysfs(struct coresight_device *csdev) spin_unlock(&drvdata->spinlock); cpus_read_unlock(); - dev_info(drvdata->dev, "ETM tracing disabled\n"); + dev_dbg(drvdata->dev, "ETM tracing disabled\n"); } static void etm_disable(struct coresight_device *csdev, diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -28,6 +28,7 @@ #include <linux/pm_runtime.h> #include <asm/sections.h> #include <asm/local.h> +#include <asm/virt.h> #include "coresight-etm4x.h" #include "coresight-etm-perf.h" @@ -77,16 +78,24 @@ static int etm4_trace_id(struct coresight_device *csdev) return drvdata->trcid; } -static void etm4_enable_hw(void *info) +struct etm4_enable_arg { + struct etmv4_drvdata *drvdata; + int rc; +}; + +static int etm4_enable_hw(struct etmv4_drvdata *drvdata) { - int i; - struct etmv4_drvdata *drvdata = info; + int i, rc; struct etmv4_config *config = &drvdata->config; CS_UNLOCK(drvdata->base); etm4_os_unlock(drvdata); + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + goto done; + /* Disable the trace unit before programming trace registers */ writel_relaxed(0, drvdata->base + TRCPRGCTLR); @@ -174,9 +183,21 @@ static void etm4_enable_hw(void *info) dev_err(drvdata->dev, "timeout while waiting for Idle Trace Status\n"); +done: CS_LOCK(drvdata->base); - dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu); + dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n", + drvdata->cpu, rc); + return rc; +} + +static void etm4_enable_hw_smp_call(void *info) +{ + struct etm4_enable_arg *arg = info; + + if (WARN_ON(!arg)) + return; + arg->rc = etm4_enable_hw(arg->drvdata); } static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, @@ -242,7 +263,7 @@ static int etm4_enable_perf(struct coresight_device *csdev, if (ret) goto out; /* And enable it */ - etm4_enable_hw(drvdata); + ret = etm4_enable_hw(drvdata); out: return ret; @@ -251,6 +272,7 @@ out: static int etm4_enable_sysfs(struct coresight_device *csdev) { struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct etm4_enable_arg arg = { 0 }; int ret; spin_lock(&drvdata->spinlock); @@ -259,19 +281,17 @@ static int etm4_enable_sysfs(struct coresight_device *csdev) * Executing etm4_enable_hw on the cpu whose ETM is being enabled * ensures that register writes occur when cpu is powered. */ + arg.drvdata = drvdata; ret = smp_call_function_single(drvdata->cpu, - etm4_enable_hw, drvdata, 1); - if (ret) - goto err; - - drvdata->sticky_enable = true; + etm4_enable_hw_smp_call, &arg, 1); + if (!ret) + ret = arg.rc; + if (!ret) + drvdata->sticky_enable = true; spin_unlock(&drvdata->spinlock); - dev_info(drvdata->dev, "ETM tracing enabled\n"); - return 0; - -err: - spin_unlock(&drvdata->spinlock); + if (!ret) + dev_dbg(drvdata->dev, "ETM tracing enabled\n"); return ret; } @@ -328,6 +348,8 @@ static void etm4_disable_hw(void *info) isb(); writel_relaxed(control, drvdata->base + TRCPRGCTLR); + coresight_disclaim_device_unlocked(drvdata->base); + CS_LOCK(drvdata->base); dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu); @@ -380,7 +402,7 @@ static void etm4_disable_sysfs(struct coresight_device *csdev) spin_unlock(&drvdata->spinlock); cpus_read_unlock(); - dev_info(drvdata->dev, "ETM tracing disabled\n"); + dev_dbg(drvdata->dev, "ETM tracing disabled\n"); } static void etm4_disable(struct coresight_device *csdev, @@ -605,7 +627,7 @@ static void etm4_set_default_config(struct etmv4_config *config) config->vinst_ctrl |= BIT(0); } -static u64 etm4_get_access_type(struct etmv4_config *config) +static u64 etm4_get_ns_access_type(struct etmv4_config *config) { u64 access_type = 0; @@ -616,17 +638,26 @@ static u64 etm4_get_access_type(struct etmv4_config *config) * Bit[13] Exception level 1 - OS * Bit[14] Exception level 2 - Hypervisor * Bit[15] Never implemented - * - * Always stay away from hypervisor mode. */ - access_type = ETM_EXLEVEL_NS_HYP; - - if (config->mode & ETM_MODE_EXCL_KERN) - access_type |= ETM_EXLEVEL_NS_OS; + if (!is_kernel_in_hyp_mode()) { + /* Stay away from hypervisor mode for non-VHE */ + access_type = ETM_EXLEVEL_NS_HYP; + if (config->mode & ETM_MODE_EXCL_KERN) + access_type |= ETM_EXLEVEL_NS_OS; + } else if (config->mode & ETM_MODE_EXCL_KERN) { + access_type = ETM_EXLEVEL_NS_HYP; + } if (config->mode & ETM_MODE_EXCL_USER) access_type |= ETM_EXLEVEL_NS_APP; + return access_type; +} + +static u64 etm4_get_access_type(struct etmv4_config *config) +{ + u64 access_type = etm4_get_ns_access_type(config); + /* * EXLEVEL_S, bits[11:8], don't trace anything happening * in secure state. @@ -880,20 +911,10 @@ void etm4_config_trace_mode(struct etmv4_config *config) addr_acc = config->addr_acc[ETM_DEFAULT_ADDR_COMP]; /* clear default config */ - addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS); + addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS | + ETM_EXLEVEL_NS_HYP); - /* - * EXLEVEL_NS, bits[15:12] - * The Exception levels are: - * Bit[12] Exception level 0 - Application - * Bit[13] Exception level 1 - OS - * Bit[14] Exception level 2 - Hypervisor - * Bit[15] Never implemented - */ - if (mode & ETM_MODE_EXCL_KERN) - addr_acc |= ETM_EXLEVEL_NS_OS; - else - addr_acc |= ETM_EXLEVEL_NS_APP; + addr_acc |= etm4_get_ns_access_type(config); config->addr_acc[ETM_DEFAULT_ADDR_COMP] = addr_acc; config->addr_acc[ETM_DEFAULT_ADDR_COMP + 1] = addr_acc; diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c @@ -25,6 +25,7 @@ #define FUNNEL_HOLDTIME_MASK 0xf00 #define FUNNEL_HOLDTIME_SHFT 0x8 #define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT) +#define FUNNEL_ENSx_MASK 0xff /** * struct funnel_drvdata - specifics associated to a funnel component @@ -42,31 +43,42 @@ struct funnel_drvdata { unsigned long priority; }; -static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port) +static int funnel_enable_hw(struct funnel_drvdata *drvdata, int port) { u32 functl; + int rc = 0; CS_UNLOCK(drvdata->base); functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); + /* Claim the device only when we enable the first slave */ + if (!(functl & FUNNEL_ENSx_MASK)) { + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + goto done; + } + functl &= ~FUNNEL_HOLDTIME_MASK; functl |= FUNNEL_HOLDTIME; functl |= (1 << port); writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL); writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL); - +done: CS_LOCK(drvdata->base); + return rc; } static int funnel_enable(struct coresight_device *csdev, int inport, int outport) { + int rc; struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - funnel_enable_hw(drvdata, inport); + rc = funnel_enable_hw(drvdata, inport); - dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); - return 0; + if (!rc) + dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport); + return rc; } static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport) @@ -79,6 +91,10 @@ static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport) functl &= ~(1 << inport); writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL); + /* Disclaim the device if none of the slaves are now active */ + if (!(functl & FUNNEL_ENSx_MASK)) + coresight_disclaim_device_unlocked(drvdata->base); + CS_LOCK(drvdata->base); } @@ -89,7 +105,7 @@ static void funnel_disable(struct coresight_device *csdev, int inport, funnel_disable_hw(drvdata, inport); - dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport); + dev_dbg(drvdata->dev, "FUNNEL inport %d disabled\n", inport); } static const struct coresight_ops_link funnel_link_ops = { diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h @@ -25,6 +25,13 @@ #define CORESIGHT_DEVID 0xfc8 #define CORESIGHT_DEVTYPE 0xfcc + +/* + * Coresight device CLAIM protocol. + * See PSCI - ARM DEN 0022D, Section: 6.8.1 Debug and Trace save and restore. + */ +#define CORESIGHT_CLAIM_SELF_HOSTED BIT(1) + #define TIMEOUT_US 100 #define BMVAL(val, lsb, msb) ((val & GENMASK(msb, lsb)) >> lsb) @@ -137,7 +144,7 @@ static inline void coresight_write_reg_pair(void __iomem *addr, u64 val, } void coresight_disable_path(struct list_head *path); -int coresight_enable_path(struct list_head *path, u32 mode); +int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data); struct coresight_device *coresight_get_sink(struct list_head *path); struct coresight_device *coresight_get_enabled_sink(bool reset); struct list_head *coresight_build_path(struct coresight_device *csdev, diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c @@ -35,7 +35,7 @@ static int replicator_enable(struct coresight_device *csdev, int inport, { struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - dev_info(drvdata->dev, "REPLICATOR enabled\n"); + dev_dbg(drvdata->dev, "REPLICATOR enabled\n"); return 0; } @@ -44,7 +44,7 @@ static void replicator_disable(struct coresight_device *csdev, int inport, { struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - dev_info(drvdata->dev, "REPLICATOR disabled\n"); + dev_dbg(drvdata->dev, "REPLICATOR disabled\n"); } static const struct coresight_ops_link replicator_link_ops = { diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c @@ -211,7 +211,7 @@ static int stm_enable(struct coresight_device *csdev, stm_enable_hw(drvdata); spin_unlock(&drvdata->spinlock); - dev_info(drvdata->dev, "STM tracing enabled\n"); + dev_dbg(drvdata->dev, "STM tracing enabled\n"); return 0; } @@ -274,7 +274,7 @@ static void stm_disable(struct coresight_device *csdev, pm_runtime_put(drvdata->dev); local_set(&drvdata->mode, CS_MODE_DISABLED); - dev_info(drvdata->dev, "STM tracing disabled\n"); + dev_dbg(drvdata->dev, "STM tracing disabled\n"); } } diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -10,8 +10,12 @@ #include <linux/slab.h> #include "coresight-priv.h" #include "coresight-tmc.h" +#include "coresight-etm-perf.h" -static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata) +static int tmc_set_etf_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle); + +static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -30,33 +34,41 @@ static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata) CS_LOCK(drvdata->base); } +static int tmc_etb_enable_hw(struct tmc_drvdata *drvdata) +{ + int rc = coresight_claim_device(drvdata->base); + + if (rc) + return rc; + + __tmc_etb_enable_hw(drvdata); + return 0; +} + static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) { char *bufp; u32 read_data, lost; - int i; /* Check if the buffer wrapped around. */ lost = readl_relaxed(drvdata->base + TMC_STS) & TMC_STS_FULL; bufp = drvdata->buf; drvdata->len = 0; while (1) { - for (i = 0; i < drvdata->memwidth; i++) { - read_data = readl_relaxed(drvdata->base + TMC_RRD); - if (read_data == 0xFFFFFFFF) - goto done; - memcpy(bufp, &read_data, 4); - bufp += 4; - drvdata->len += 4; - } + read_data = readl_relaxed(drvdata->base + TMC_RRD); + if (read_data == 0xFFFFFFFF) + break; + memcpy(bufp, &read_data, 4); + bufp += 4; + drvdata->len += 4; } -done: + if (lost) coresight_insert_barrier_packet(drvdata->buf); return; } -static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) +static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -72,7 +84,13 @@ static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) CS_LOCK(drvdata->base); } -static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata) +static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) +{ + coresight_disclaim_device(drvdata); + __tmc_etb_disable_hw(drvdata); +} + +static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -88,13 +106,24 @@ static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata) CS_LOCK(drvdata->base); } +static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata) +{ + int rc = coresight_claim_device(drvdata->base); + + if (rc) + return rc; + + __tmc_etf_enable_hw(drvdata); + return 0; +} + static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); tmc_flush_and_stop(drvdata); tmc_disable_hw(drvdata); - + coresight_disclaim_device_unlocked(drvdata->base); CS_LOCK(drvdata->base); } @@ -170,8 +199,12 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev) drvdata->buf = buf; } - drvdata->mode = CS_MODE_SYSFS; - tmc_etb_enable_hw(drvdata); + ret = tmc_etb_enable_hw(drvdata); + if (!ret) + drvdata->mode = CS_MODE_SYSFS; + else + /* Free up the buffer if we failed to enable */ + used = false; out: spin_unlock_irqrestore(&drvdata->spinlock, flags); @@ -182,37 +215,40 @@ out: return ret; } -static int tmc_enable_etf_sink_perf(struct coresight_device *csdev) +static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data) { int ret = 0; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct perf_output_handle *handle = data; spin_lock_irqsave(&drvdata->spinlock, flags); - if (drvdata->reading) { + do { ret = -EINVAL; - goto out; - } - - /* - * In Perf mode there can be only one writer per sink. There - * is also no need to continue if the ETB/ETR is already operated - * from sysFS. - */ - if (drvdata->mode != CS_MODE_DISABLED) { - ret = -EINVAL; - goto out; - } + if (drvdata->reading) + break; + /* + * In Perf mode there can be only one writer per sink. There + * is also no need to continue if the ETB/ETF is already + * operated from sysFS. + */ + if (drvdata->mode != CS_MODE_DISABLED) + break; - drvdata->mode = CS_MODE_PERF; - tmc_etb_enable_hw(drvdata); -out: + ret = tmc_set_etf_buffer(csdev, handle); + if (ret) + break; + ret = tmc_etb_enable_hw(drvdata); + if (!ret) + drvdata->mode = CS_MODE_PERF; + } while (0); spin_unlock_irqrestore(&drvdata->spinlock, flags); return ret; } -static int tmc_enable_etf_sink(struct coresight_device *csdev, u32 mode) +static int tmc_enable_etf_sink(struct coresight_device *csdev, + u32 mode, void *data) { int ret; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); @@ -222,7 +258,7 @@ static int tmc_enable_etf_sink(struct coresight_device *csdev, u32 mode) ret = tmc_enable_etf_sink_sysfs(csdev); break; case CS_MODE_PERF: - ret = tmc_enable_etf_sink_perf(csdev); + ret = tmc_enable_etf_sink_perf(csdev, data); break; /* We shouldn't be here */ default: @@ -233,7 +269,7 @@ static int tmc_enable_etf_sink(struct coresight_device *csdev, u32 mode) if (ret) return ret; - dev_info(drvdata->dev, "TMC-ETB/ETF enabled\n"); + dev_dbg(drvdata->dev, "TMC-ETB/ETF enabled\n"); return 0; } @@ -256,12 +292,13 @@ static void tmc_disable_etf_sink(struct coresight_device *csdev) spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "TMC-ETB/ETF disabled\n"); + dev_dbg(drvdata->dev, "TMC-ETB/ETF disabled\n"); } static int tmc_enable_etf_link(struct coresight_device *csdev, int inport, int outport) { + int ret; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); @@ -271,12 +308,14 @@ static int tmc_enable_etf_link(struct coresight_device *csdev, return -EBUSY; } - tmc_etf_enable_hw(drvdata); - drvdata->mode = CS_MODE_SYSFS; + ret = tmc_etf_enable_hw(drvdata); + if (!ret) + drvdata->mode = CS_MODE_SYSFS; spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "TMC-ETF enabled\n"); - return 0; + if (!ret) + dev_dbg(drvdata->dev, "TMC-ETF enabled\n"); + return ret; } static void tmc_disable_etf_link(struct coresight_device *csdev, @@ -295,7 +334,7 @@ static void tmc_disable_etf_link(struct coresight_device *csdev, drvdata->mode = CS_MODE_DISABLED; spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "TMC-ETF disabled\n"); + dev_dbg(drvdata->dev, "TMC-ETF disabled\n"); } static void *tmc_alloc_etf_buffer(struct coresight_device *csdev, int cpu, @@ -328,12 +367,14 @@ static void tmc_free_etf_buffer(void *config) } static int tmc_set_etf_buffer(struct coresight_device *csdev, - struct perf_output_handle *handle, - void *sink_config) + struct perf_output_handle *handle) { int ret = 0; unsigned long head; - struct cs_buffers *buf = sink_config; + struct cs_buffers *buf = etm_perf_sink_config(handle); + + if (!buf) + return -EINVAL; /* wrap head around to the amount of space we have */ head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); @@ -349,36 +390,7 @@ static int tmc_set_etf_buffer(struct coresight_device *csdev, return ret; } -static unsigned long tmc_reset_etf_buffer(struct coresight_device *csdev, - struct perf_output_handle *handle, - void *sink_config) -{ - long size = 0; - struct cs_buffers *buf = sink_config; - - if (buf) { - /* - * In snapshot mode ->data_size holds the new address of the - * ring buffer's head. The size itself is the whole address - * range since we want the latest information. - */ - if (buf->snapshot) - handle->head = local_xchg(&buf->data_size, - buf->nr_pages << PAGE_SHIFT); - /* - * Tell the tracer PMU how much we got in this run and if - * something went wrong along the way. Nobody else can use - * this cs_buffers instance until we are done. As such - * resetting parameters here and squaring off with the ring - * buffer API in the tracer PMU is fine. - */ - size = local_xchg(&buf->data_size, 0); - } - - return size; -} - -static void tmc_update_etf_buffer(struct coresight_device *csdev, +static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev, struct perf_output_handle *handle, void *sink_config) { @@ -387,17 +399,17 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev, const u32 *barrier; u32 *buf_ptr; u64 read_ptr, write_ptr; - u32 status, to_read; - unsigned long offset; + u32 status; + unsigned long offset, to_read; struct cs_buffers *buf = sink_config; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); if (!buf) - return; + return 0; /* This shouldn't happen */ if (WARN_ON_ONCE(drvdata->mode != CS_MODE_PERF)) - return; + return 0; CS_UNLOCK(drvdata->base); @@ -438,10 +450,10 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev, case TMC_MEM_INTF_WIDTH_32BITS: case TMC_MEM_INTF_WIDTH_64BITS: case TMC_MEM_INTF_WIDTH_128BITS: - mask = GENMASK(31, 5); + mask = GENMASK(31, 4); break; case TMC_MEM_INTF_WIDTH_256BITS: - mask = GENMASK(31, 6); + mask = GENMASK(31, 5); break; } @@ -486,18 +498,14 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev, } } - /* - * In snapshot mode all we have to do is communicate to - * perf_aux_output_end() the address of the current head. In full - * trace mode the same function expects a size to move rb->aux_head - * forward. - */ - if (buf->snapshot) - local_set(&buf->data_size, (cur * PAGE_SIZE) + offset); - else - local_add(to_read, &buf->data_size); - + /* In snapshot mode we have to update the head */ + if (buf->snapshot) { + handle->head = (cur * PAGE_SIZE) + offset; + to_read = buf->nr_pages << PAGE_SHIFT; + } CS_LOCK(drvdata->base); + + return to_read; } static const struct coresight_ops_sink tmc_etf_sink_ops = { @@ -505,8 +513,6 @@ static const struct coresight_ops_sink tmc_etf_sink_ops = { .disable = tmc_disable_etf_sink, .alloc_buffer = tmc_alloc_etf_buffer, .free_buffer = tmc_free_etf_buffer, - .set_buffer = tmc_set_etf_buffer, - .reset_buffer = tmc_reset_etf_buffer, .update_buffer = tmc_update_etf_buffer, }; @@ -563,7 +569,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) /* Disable the TMC if need be */ if (drvdata->mode == CS_MODE_SYSFS) - tmc_etb_disable_hw(drvdata); + __tmc_etb_disable_hw(drvdata); drvdata->reading = true; out: @@ -603,7 +609,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) * can't be NULL. */ memset(drvdata->buf, 0, drvdata->size); - tmc_etb_enable_hw(drvdata); + __tmc_etb_enable_hw(drvdata); } else { /* * The ETB/ETF is not tracing and the buffer was just read. diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -10,6 +10,7 @@ #include <linux/slab.h> #include <linux/vmalloc.h> #include "coresight-catu.h" +#include "coresight-etm-perf.h" #include "coresight-priv.h" #include "coresight-tmc.h" @@ -21,6 +22,28 @@ struct etr_flat_buf { }; /* + * etr_perf_buffer - Perf buffer used for ETR + * @etr_buf - Actual buffer used by the ETR + * @snaphost - Perf session mode + * @head - handle->head at the beginning of the session. + * @nr_pages - Number of pages in the ring buffer. + * @pages - Array of Pages in the ring buffer. + */ +struct etr_perf_buffer { + struct etr_buf *etr_buf; + bool snapshot; + unsigned long head; + int nr_pages; + void **pages; +}; + +/* Convert the perf index to an offset within the ETR buffer */ +#define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT)) + +/* Lower limit for ETR hardware buffer */ +#define TMC_ETR_PERF_MIN_BUF_SIZE SZ_1M + +/* * The TMC ETR SG has a page size of 4K. The SG table contains pointers * to 4KB buffers. However, the OS may use a PAGE_SIZE different from * 4K (i.e, 16KB or 64KB). This implies that a single OS page could @@ -536,7 +559,7 @@ tmc_init_etr_sg_table(struct device *dev, int node, sg_table = tmc_alloc_sg_table(dev, node, nr_tpages, nr_dpages, pages); if (IS_ERR(sg_table)) { kfree(etr_table); - return ERR_PTR(PTR_ERR(sg_table)); + return ERR_CAST(sg_table); } etr_table->sg_table = sg_table; @@ -728,12 +751,14 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata) return NULL; } -static inline void tmc_etr_enable_catu(struct tmc_drvdata *drvdata) +static inline int tmc_etr_enable_catu(struct tmc_drvdata *drvdata, + struct etr_buf *etr_buf) { struct coresight_device *catu = tmc_etr_get_catu_device(drvdata); if (catu && helper_ops(catu)->enable) - helper_ops(catu)->enable(catu, drvdata->etr_buf); + return helper_ops(catu)->enable(catu, etr_buf); + return 0; } static inline void tmc_etr_disable_catu(struct tmc_drvdata *drvdata) @@ -895,17 +920,11 @@ static void tmc_sync_etr_buf(struct tmc_drvdata *drvdata) tmc_etr_buf_insert_barrier_packet(etr_buf, etr_buf->offset); } -static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata) +static void __tmc_etr_enable_hw(struct tmc_drvdata *drvdata) { u32 axictl, sts; struct etr_buf *etr_buf = drvdata->etr_buf; - /* - * If this ETR is connected to a CATU, enable it before we turn - * this on - */ - tmc_etr_enable_catu(drvdata); - CS_UNLOCK(drvdata->base); /* Wait for TMCSReady bit to be set */ @@ -924,11 +943,8 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata) axictl |= TMC_AXICTL_ARCACHE_OS; } - if (etr_buf->mode == ETR_MODE_ETR_SG) { - if (WARN_ON(!tmc_etr_has_cap(drvdata, TMC_ETR_SG))) - return; + if (etr_buf->mode == ETR_MODE_ETR_SG) axictl |= TMC_AXICTL_SCT_GAT_MODE; - } writel_relaxed(axictl, drvdata->base + TMC_AXICTL); tmc_write_dba(drvdata, etr_buf->hwaddr); @@ -954,19 +970,54 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata) CS_LOCK(drvdata->base); } +static int tmc_etr_enable_hw(struct tmc_drvdata *drvdata, + struct etr_buf *etr_buf) +{ + int rc; + + /* Callers should provide an appropriate buffer for use */ + if (WARN_ON(!etr_buf)) + return -EINVAL; + + if ((etr_buf->mode == ETR_MODE_ETR_SG) && + WARN_ON(!tmc_etr_has_cap(drvdata, TMC_ETR_SG))) + return -EINVAL; + + if (WARN_ON(drvdata->etr_buf)) + return -EBUSY; + + /* + * If this ETR is connected to a CATU, enable it before we turn + * this on. + */ + rc = tmc_etr_enable_catu(drvdata, etr_buf); + if (rc) + return rc; + rc = coresight_claim_device(drvdata->base); + if (!rc) { + drvdata->etr_buf = etr_buf; + __tmc_etr_enable_hw(drvdata); + } + + return rc; +} + /* * Return the available trace data in the buffer (starts at etr_buf->offset, * limited by etr_buf->len) from @pos, with a maximum limit of @len, * also updating the @bufpp on where to find it. Since the trace data * starts at anywhere in the buffer, depending on the RRP, we adjust the * @len returned to handle buffer wrapping around. + * + * We are protected here by drvdata->reading != 0, which ensures the + * sysfs_buf stays alive. */ ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata, loff_t pos, size_t len, char **bufpp) { s64 offset; ssize_t actual = len; - struct etr_buf *etr_buf = drvdata->etr_buf; + struct etr_buf *etr_buf = drvdata->sysfs_buf; if (pos + actual > etr_buf->len) actual = etr_buf->len - pos; @@ -996,10 +1047,17 @@ tmc_etr_free_sysfs_buf(struct etr_buf *buf) static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata) { - tmc_sync_etr_buf(drvdata); + struct etr_buf *etr_buf = drvdata->etr_buf; + + if (WARN_ON(drvdata->sysfs_buf != etr_buf)) { + tmc_etr_free_sysfs_buf(drvdata->sysfs_buf); + drvdata->sysfs_buf = NULL; + } else { + tmc_sync_etr_buf(drvdata); + } } -static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) +static void __tmc_etr_disable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -1015,8 +1073,16 @@ static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) CS_LOCK(drvdata->base); +} + +static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) +{ + __tmc_etr_disable_hw(drvdata); /* Disable CATU device if this ETR is connected to one */ tmc_etr_disable_catu(drvdata); + coresight_disclaim_device(drvdata->base); + /* Reset the ETR buf used by hardware */ + drvdata->etr_buf = NULL; } static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) @@ -1024,7 +1090,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) int ret = 0; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); - struct etr_buf *new_buf = NULL, *free_buf = NULL; + struct etr_buf *sysfs_buf = NULL, *new_buf = NULL, *free_buf = NULL; /* * If we are enabling the ETR from disabled state, we need to make @@ -1035,7 +1101,8 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) * with the lock released. */ spin_lock_irqsave(&drvdata->spinlock, flags); - if (!drvdata->etr_buf || (drvdata->etr_buf->size != drvdata->size)) { + sysfs_buf = READ_ONCE(drvdata->sysfs_buf); + if (!sysfs_buf || (sysfs_buf->size != drvdata->size)) { spin_unlock_irqrestore(&drvdata->spinlock, flags); /* Allocate memory with the locks released */ @@ -1064,14 +1131,15 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) * If we don't have a buffer or it doesn't match the requested size, * use the buffer allocated above. Otherwise reuse the existing buffer. */ - if (!drvdata->etr_buf || - (new_buf && drvdata->etr_buf->size != new_buf->size)) { - free_buf = drvdata->etr_buf; - drvdata->etr_buf = new_buf; + sysfs_buf = READ_ONCE(drvdata->sysfs_buf); + if (!sysfs_buf || (new_buf && sysfs_buf->size != new_buf->size)) { + free_buf = sysfs_buf; + drvdata->sysfs_buf = new_buf; } - drvdata->mode = CS_MODE_SYSFS; - tmc_etr_enable_hw(drvdata); + ret = tmc_etr_enable_hw(drvdata, drvdata->sysfs_buf); + if (!ret) + drvdata->mode = CS_MODE_SYSFS; out: spin_unlock_irqrestore(&drvdata->spinlock, flags); @@ -1080,24 +1148,244 @@ out: tmc_etr_free_sysfs_buf(free_buf); if (!ret) - dev_info(drvdata->dev, "TMC-ETR enabled\n"); + dev_dbg(drvdata->dev, "TMC-ETR enabled\n"); return ret; } -static int tmc_enable_etr_sink_perf(struct coresight_device *csdev) +/* + * tmc_etr_setup_perf_buf: Allocate ETR buffer for use by perf. + * The size of the hardware buffer is dependent on the size configured + * via sysfs and the perf ring buffer size. We prefer to allocate the + * largest possible size, scaling down the size by half until it + * reaches a minimum limit (1M), beyond which we give up. + */ +static struct etr_perf_buffer * +tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, int node, int nr_pages, + void **pages, bool snapshot) { - /* We don't support perf mode yet ! */ - return -EINVAL; + struct etr_buf *etr_buf; + struct etr_perf_buffer *etr_perf; + unsigned long size; + + etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node); + if (!etr_perf) + return ERR_PTR(-ENOMEM); + + /* + * Try to match the perf ring buffer size if it is larger + * than the size requested via sysfs. + */ + if ((nr_pages << PAGE_SHIFT) > drvdata->size) { + etr_buf = tmc_alloc_etr_buf(drvdata, (nr_pages << PAGE_SHIFT), + 0, node, NULL); + if (!IS_ERR(etr_buf)) + goto done; + } + + /* + * Else switch to configured size for this ETR + * and scale down until we hit the minimum limit. + */ + size = drvdata->size; + do { + etr_buf = tmc_alloc_etr_buf(drvdata, size, 0, node, NULL); + if (!IS_ERR(etr_buf)) + goto done; + size /= 2; + } while (size >= TMC_ETR_PERF_MIN_BUF_SIZE); + + kfree(etr_perf); + return ERR_PTR(-ENOMEM); + +done: + etr_perf->etr_buf = etr_buf; + return etr_perf; } -static int tmc_enable_etr_sink(struct coresight_device *csdev, u32 mode) + +static void *tmc_alloc_etr_buffer(struct coresight_device *csdev, + int cpu, void **pages, int nr_pages, + bool snapshot) +{ + struct etr_perf_buffer *etr_perf; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + if (cpu == -1) + cpu = smp_processor_id(); + + etr_perf = tmc_etr_setup_perf_buf(drvdata, cpu_to_node(cpu), + nr_pages, pages, snapshot); + if (IS_ERR(etr_perf)) { + dev_dbg(drvdata->dev, "Unable to allocate ETR buffer\n"); + return NULL; + } + + etr_perf->snapshot = snapshot; + etr_perf->nr_pages = nr_pages; + etr_perf->pages = pages; + + return etr_perf; +} + +static void tmc_free_etr_buffer(void *config) +{ + struct etr_perf_buffer *etr_perf = config; + + if (etr_perf->etr_buf) + tmc_free_etr_buf(etr_perf->etr_buf); + kfree(etr_perf); +} + +/* + * tmc_etr_sync_perf_buffer: Copy the actual trace data from the hardware + * buffer to the perf ring buffer. + */ +static void tmc_etr_sync_perf_buffer(struct etr_perf_buffer *etr_perf) +{ + long bytes, to_copy; + long pg_idx, pg_offset, src_offset; + unsigned long head = etr_perf->head; + char **dst_pages, *src_buf; + struct etr_buf *etr_buf = etr_perf->etr_buf; + + head = etr_perf->head; + pg_idx = head >> PAGE_SHIFT; + pg_offset = head & (PAGE_SIZE - 1); + dst_pages = (char **)etr_perf->pages; + src_offset = etr_buf->offset; + to_copy = etr_buf->len; + + while (to_copy > 0) { + /* + * In one iteration, we can copy minimum of : + * 1) what is available in the source buffer, + * 2) what is available in the source buffer, before it + * wraps around. + * 3) what is available in the destination page. + * in one iteration. + */ + bytes = tmc_etr_buf_get_data(etr_buf, src_offset, to_copy, + &src_buf); + if (WARN_ON_ONCE(bytes <= 0)) + break; + bytes = min(bytes, (long)(PAGE_SIZE - pg_offset)); + + memcpy(dst_pages[pg_idx] + pg_offset, src_buf, bytes); + + to_copy -= bytes; + + /* Move destination pointers */ + pg_offset += bytes; + if (pg_offset == PAGE_SIZE) { + pg_offset = 0; + if (++pg_idx == etr_perf->nr_pages) + pg_idx = 0; + } + + /* Move source pointers */ + src_offset += bytes; + if (src_offset >= etr_buf->size) + src_offset -= etr_buf->size; + } +} + +/* + * tmc_update_etr_buffer : Update the perf ring buffer with the + * available trace data. We use software double buffering at the moment. + * + * TODO: Add support for reusing the perf ring buffer. + */ +static unsigned long +tmc_update_etr_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *config) +{ + bool lost = false; + unsigned long flags, size = 0; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct etr_perf_buffer *etr_perf = config; + struct etr_buf *etr_buf = etr_perf->etr_buf; + + spin_lock_irqsave(&drvdata->spinlock, flags); + if (WARN_ON(drvdata->perf_data != etr_perf)) { + lost = true; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + goto out; + } + + CS_UNLOCK(drvdata->base); + + tmc_flush_and_stop(drvdata); + tmc_sync_etr_buf(drvdata); + + CS_LOCK(drvdata->base); + /* Reset perf specific data */ + drvdata->perf_data = NULL; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + size = etr_buf->len; + tmc_etr_sync_perf_buffer(etr_perf); + + /* + * Update handle->head in snapshot mode. Also update the size to the + * hardware buffer size if there was an overflow. + */ + if (etr_perf->snapshot) { + handle->head += size; + if (etr_buf->full) + size = etr_buf->size; + } + + lost |= etr_buf->full; +out: + if (lost) + perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); + return size; +} + +static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data) +{ + int rc = 0; + unsigned long flags; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct perf_output_handle *handle = data; + struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle); + + spin_lock_irqsave(&drvdata->spinlock, flags); + /* + * There can be only one writer per sink in perf mode. If the sink + * is already open in SYSFS mode, we can't use it. + */ + if (drvdata->mode != CS_MODE_DISABLED || WARN_ON(drvdata->perf_data)) { + rc = -EBUSY; + goto unlock_out; + } + + if (WARN_ON(!etr_perf || !etr_perf->etr_buf)) { + rc = -EINVAL; + goto unlock_out; + } + + etr_perf->head = PERF_IDX2OFF(handle->head, etr_perf); + drvdata->perf_data = etr_perf; + rc = tmc_etr_enable_hw(drvdata, etr_perf->etr_buf); + if (!rc) + drvdata->mode = CS_MODE_PERF; + +unlock_out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return rc; +} + +static int tmc_enable_etr_sink(struct coresight_device *csdev, + u32 mode, void *data) { switch (mode) { case CS_MODE_SYSFS: return tmc_enable_etr_sink_sysfs(csdev); case CS_MODE_PERF: - return tmc_enable_etr_sink_perf(csdev); + return tmc_enable_etr_sink_perf(csdev, data); } /* We shouldn't be here */ @@ -1123,12 +1411,15 @@ static void tmc_disable_etr_sink(struct coresight_device *csdev) spin_unlock_irqrestore(&drvdata->spinlock, flags); - dev_info(drvdata->dev, "TMC-ETR disabled\n"); + dev_dbg(drvdata->dev, "TMC-ETR disabled\n"); } static const struct coresight_ops_sink tmc_etr_sink_ops = { .enable = tmc_enable_etr_sink, .disable = tmc_disable_etr_sink, + .alloc_buffer = tmc_alloc_etr_buffer, + .update_buffer = tmc_update_etr_buffer, + .free_buffer = tmc_free_etr_buffer, }; const struct coresight_ops tmc_etr_cs_ops = { @@ -1150,21 +1441,19 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) goto out; } - /* Don't interfere if operated from Perf */ - if (drvdata->mode == CS_MODE_PERF) { - ret = -EINVAL; - goto out; - } - - /* If drvdata::etr_buf is NULL the trace data has been read already */ - if (drvdata->etr_buf == NULL) { + /* + * We can safely allow reads even if the ETR is operating in PERF mode, + * since the sysfs session is captured in mode specific data. + * If drvdata::sysfs_data is NULL the trace data has been read already. + */ + if (!drvdata->sysfs_buf) { ret = -EINVAL; goto out; } - /* Disable the TMC if need be */ + /* Disable the TMC if we are trying to read from a running session. */ if (drvdata->mode == CS_MODE_SYSFS) - tmc_etr_disable_hw(drvdata); + __tmc_etr_disable_hw(drvdata); drvdata->reading = true; out: @@ -1176,7 +1465,7 @@ out: int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) { unsigned long flags; - struct etr_buf *etr_buf = NULL; + struct etr_buf *sysfs_buf = NULL; /* config types are set a boot time and never change */ if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) @@ -1191,22 +1480,22 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) * buffer. Since the tracer is still enabled drvdata::buf can't * be NULL. */ - tmc_etr_enable_hw(drvdata); + __tmc_etr_enable_hw(drvdata); } else { /* * The ETR is not tracing and the buffer was just read. * As such prepare to free the trace buffer. */ - etr_buf = drvdata->etr_buf; - drvdata->etr_buf = NULL; + sysfs_buf = drvdata->sysfs_buf; + drvdata->sysfs_buf = NULL; } drvdata->reading = false; spin_unlock_irqrestore(&drvdata->spinlock, flags); /* Free allocated memory out side of the spinlock */ - if (etr_buf) - tmc_free_etr_buf(etr_buf); + if (sysfs_buf) + tmc_etr_free_sysfs_buf(sysfs_buf); return 0; } diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c @@ -81,7 +81,7 @@ static int tmc_read_prepare(struct tmc_drvdata *drvdata) } if (!ret) - dev_info(drvdata->dev, "TMC read start\n"); + dev_dbg(drvdata->dev, "TMC read start\n"); return ret; } @@ -103,7 +103,7 @@ static int tmc_read_unprepare(struct tmc_drvdata *drvdata) } if (!ret) - dev_info(drvdata->dev, "TMC read end\n"); + dev_dbg(drvdata->dev, "TMC read end\n"); return ret; } diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h @@ -170,6 +170,8 @@ struct etr_buf { * @trigger_cntr: amount of words to store after a trigger. * @etr_caps: Bitmask of capabilities of the TMC ETR, inferred from the * device configuration register (DEVID) + * @perf_data: PERF buffer for ETR. + * @sysfs_data: SYSFS buffer for ETR. */ struct tmc_drvdata { void __iomem *base; @@ -189,6 +191,8 @@ struct tmc_drvdata { enum tmc_mem_intf_width memwidth; u32 trigger_cntr; u32 etr_caps; + struct etr_buf *sysfs_buf; + void *perf_data; }; struct etr_buf_operations { diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c @@ -68,13 +68,13 @@ static void tpiu_enable_hw(struct tpiu_drvdata *drvdata) CS_LOCK(drvdata->base); } -static int tpiu_enable(struct coresight_device *csdev, u32 mode) +static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused) { struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); tpiu_enable_hw(drvdata); - dev_info(drvdata->dev, "TPIU enabled\n"); + dev_dbg(drvdata->dev, "TPIU enabled\n"); return 0; } @@ -100,7 +100,7 @@ static void tpiu_disable(struct coresight_device *csdev) tpiu_disable_hw(drvdata); - dev_info(drvdata->dev, "TPIU disabled\n"); + dev_dbg(drvdata->dev, "TPIU disabled\n"); } static const struct coresight_ops_sink tpiu_sink_ops = { diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c @@ -128,16 +128,105 @@ static int coresight_find_link_outport(struct coresight_device *csdev, return -ENODEV; } -static int coresight_enable_sink(struct coresight_device *csdev, u32 mode) +static inline u32 coresight_read_claim_tags(void __iomem *base) +{ + return readl_relaxed(base + CORESIGHT_CLAIMCLR); +} + +static inline bool coresight_is_claimed_self_hosted(void __iomem *base) +{ + return coresight_read_claim_tags(base) == CORESIGHT_CLAIM_SELF_HOSTED; +} + +static inline bool coresight_is_claimed_any(void __iomem *base) +{ + return coresight_read_claim_tags(base) != 0; +} + +static inline void coresight_set_claim_tags(void __iomem *base) +{ + writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMSET); + isb(); +} + +static inline void coresight_clear_claim_tags(void __iomem *base) +{ + writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMCLR); + isb(); +} + +/* + * coresight_claim_device_unlocked : Claim the device for self-hosted usage + * to prevent an external tool from touching this device. As per PSCI + * standards, section "Preserving the execution context" => "Debug and Trace + * save and Restore", DBGCLAIM[1] is reserved for Self-hosted debug/trace and + * DBGCLAIM[0] is reserved for external tools. + * + * Called with CS_UNLOCKed for the component. + * Returns : 0 on success + */ +int coresight_claim_device_unlocked(void __iomem *base) +{ + if (coresight_is_claimed_any(base)) + return -EBUSY; + + coresight_set_claim_tags(base); + if (coresight_is_claimed_self_hosted(base)) + return 0; + /* There was a race setting the tags, clean up and fail */ + coresight_clear_claim_tags(base); + return -EBUSY; +} + +int coresight_claim_device(void __iomem *base) +{ + int rc; + + CS_UNLOCK(base); + rc = coresight_claim_device_unlocked(base); + CS_LOCK(base); + + return rc; +} + +/* + * coresight_disclaim_device_unlocked : Clear the claim tags for the device. + * Called with CS_UNLOCKed for the component. + */ +void coresight_disclaim_device_unlocked(void __iomem *base) +{ + + if (coresight_is_claimed_self_hosted(base)) + coresight_clear_claim_tags(base); + else + /* + * The external agent may have not honoured our claim + * and has manipulated it. Or something else has seriously + * gone wrong in our driver. + */ + WARN_ON_ONCE(1); +} + +void coresight_disclaim_device(void __iomem *base) +{ + CS_UNLOCK(base); + coresight_disclaim_device_unlocked(base); + CS_LOCK(base); +} + +static int coresight_enable_sink(struct coresight_device *csdev, + u32 mode, void *data) { int ret; - if (!csdev->enable) { - if (sink_ops(csdev)->enable) { - ret = sink_ops(csdev)->enable(csdev, mode); - if (ret) - return ret; - } + /* + * We need to make sure the "new" session is compatible with the + * existing "mode" of operation. + */ + if (sink_ops(csdev)->enable) { + ret = sink_ops(csdev)->enable(csdev, mode, data); + if (ret) + return ret; csdev->enable = true; } @@ -184,8 +273,10 @@ static int coresight_enable_link(struct coresight_device *csdev, if (atomic_inc_return(&csdev->refcnt[refport]) == 1) { if (link_ops(csdev)->enable) { ret = link_ops(csdev)->enable(csdev, inport, outport); - if (ret) + if (ret) { + atomic_dec(&csdev->refcnt[refport]); return ret; + } } } @@ -274,13 +365,21 @@ static bool coresight_disable_source(struct coresight_device *csdev) return !csdev->enable; } -void coresight_disable_path(struct list_head *path) +/* + * coresight_disable_path_from : Disable components in the given path beyond + * @nd in the list. If @nd is NULL, all the components, except the SOURCE are + * disabled. + */ +static void coresight_disable_path_from(struct list_head *path, + struct coresight_node *nd) { u32 type; - struct coresight_node *nd; struct coresight_device *csdev, *parent, *child; - list_for_each_entry(nd, path, link) { + if (!nd) + nd = list_first_entry(path, struct coresight_node, link); + + list_for_each_entry_continue(nd, path, link) { csdev = nd->csdev; type = csdev->type; @@ -300,7 +399,12 @@ void coresight_disable_path(struct list_head *path) coresight_disable_sink(csdev); break; case CORESIGHT_DEV_TYPE_SOURCE: - /* sources are disabled from either sysFS or Perf */ + /* + * We skip the first node in the path assuming that it + * is the source. So we don't expect a source device in + * the middle of a path. + */ + WARN_ON(1); break; case CORESIGHT_DEV_TYPE_LINK: parent = list_prev_entry(nd, link)->csdev; @@ -313,7 +417,12 @@ void coresight_disable_path(struct list_head *path) } } -int coresight_enable_path(struct list_head *path, u32 mode) +void coresight_disable_path(struct list_head *path) +{ + coresight_disable_path_from(path, NULL); +} + +int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data) { int ret = 0; @@ -338,9 +447,15 @@ int coresight_enable_path(struct list_head *path, u32 mode) switch (type) { case CORESIGHT_DEV_TYPE_SINK: - ret = coresight_enable_sink(csdev, mode); + ret = coresight_enable_sink(csdev, mode, sink_data); + /* + * Sink is the first component turned on. If we + * failed to enable the sink, there are no components + * that need disabling. Disabling the path here + * would mean we could disrupt an existing session. + */ if (ret) - goto err; + goto out; break; case CORESIGHT_DEV_TYPE_SOURCE: /* sources are enabled from either sysFS or Perf */ @@ -360,7 +475,7 @@ int coresight_enable_path(struct list_head *path, u32 mode) out: return ret; err: - coresight_disable_path(path); + coresight_disable_path_from(path, nd); goto out; } @@ -635,7 +750,7 @@ int coresight_enable(struct coresight_device *csdev) goto out; } - ret = coresight_enable_path(path, CS_MODE_SYSFS); + ret = coresight_enable_path(path, CS_MODE_SYSFS, NULL); if (ret) goto err_path; @@ -995,18 +1110,16 @@ postcore_initcall(coresight_init); struct coresight_device *coresight_register(struct coresight_desc *desc) { - int i; int ret; int link_subtype; int nr_refcnts = 1; atomic_t *refcnts = NULL; struct coresight_device *csdev; - struct coresight_connection *conns = NULL; csdev = kzalloc(sizeof(*csdev), GFP_KERNEL); if (!csdev) { ret = -ENOMEM; - goto err_kzalloc_csdev; + goto err_out; } if (desc->type == CORESIGHT_DEV_TYPE_LINK || @@ -1022,7 +1135,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL); if (!refcnts) { ret = -ENOMEM; - goto err_kzalloc_refcnts; + goto err_free_csdev; } csdev->refcnt = refcnts; @@ -1030,22 +1143,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) csdev->nr_inport = desc->pdata->nr_inport; csdev->nr_outport = desc->pdata->nr_outport; - /* Initialise connections if there is at least one outport */ - if (csdev->nr_outport) { - conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL); - if (!conns) { - ret = -ENOMEM; - goto err_kzalloc_conns; - } - - for (i = 0; i < csdev->nr_outport; i++) { - conns[i].outport = desc->pdata->outports[i]; - conns[i].child_name = desc->pdata->child_names[i]; - conns[i].child_port = desc->pdata->child_ports[i]; - } - } - - csdev->conns = conns; + csdev->conns = desc->pdata->conns; csdev->type = desc->type; csdev->subtype = desc->subtype; @@ -1062,7 +1160,11 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) ret = device_register(&csdev->dev); if (ret) { put_device(&csdev->dev); - goto err_kzalloc_csdev; + /* + * All resources are free'd explicitly via + * coresight_device_release(), triggered from put_device(). + */ + goto err_out; } mutex_lock(&coresight_mutex); @@ -1074,11 +1176,9 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) return csdev; -err_kzalloc_conns: - kfree(refcnts); -err_kzalloc_refcnts: +err_free_csdev: kfree(csdev); -err_kzalloc_csdev: +err_out: return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(coresight_register); diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c @@ -45,8 +45,13 @@ of_coresight_get_endpoint_device(struct device_node *endpoint) endpoint, of_dev_node_match); } -static void of_coresight_get_ports(const struct device_node *node, - int *nr_inport, int *nr_outport) +static inline bool of_coresight_legacy_ep_is_input(struct device_node *ep) +{ + return of_property_read_bool(ep, "slave-mode"); +} + +static void of_coresight_get_ports_legacy(const struct device_node *node, + int *nr_inport, int *nr_outport) { struct device_node *ep = NULL; int in = 0, out = 0; @@ -56,7 +61,7 @@ static void of_coresight_get_ports(const struct device_node *node, if (!ep) break; - if (of_property_read_bool(ep, "slave-mode")) + if (of_coresight_legacy_ep_is_input(ep)) in++; else out++; @@ -67,32 +72,77 @@ static void of_coresight_get_ports(const struct device_node *node, *nr_outport = out; } +static struct device_node *of_coresight_get_port_parent(struct device_node *ep) +{ + struct device_node *parent = of_graph_get_port_parent(ep); + + /* + * Skip one-level up to the real device node, if we + * are using the new bindings. + */ + if (!of_node_cmp(parent->name, "in-ports") || + !of_node_cmp(parent->name, "out-ports")) + parent = of_get_next_parent(parent); + + return parent; +} + +static inline struct device_node * +of_coresight_get_input_ports_node(const struct device_node *node) +{ + return of_get_child_by_name(node, "in-ports"); +} + +static inline struct device_node * +of_coresight_get_output_ports_node(const struct device_node *node) +{ + return of_get_child_by_name(node, "out-ports"); +} + +static inline int +of_coresight_count_ports(struct device_node *port_parent) +{ + int i = 0; + struct device_node *ep = NULL; + + while ((ep = of_graph_get_next_endpoint(port_parent, ep))) + i++; + return i; +} + +static void of_coresight_get_ports(const struct device_node *node, + int *nr_inport, int *nr_outport) +{ + struct device_node *input_ports = NULL, *output_ports = NULL; + + input_ports = of_coresight_get_input_ports_node(node); + output_ports = of_coresight_get_output_ports_node(node); + + if (input_ports || output_ports) { + if (input_ports) { + *nr_inport = of_coresight_count_ports(input_ports); + of_node_put(input_ports); + } + if (output_ports) { + *nr_outport = of_coresight_count_ports(output_ports); + of_node_put(output_ports); + } + } else { + /* Fall back to legacy DT bindings parsing */ + of_coresight_get_ports_legacy(node, nr_inport, nr_outport); + } +} + static int of_coresight_alloc_memory(struct device *dev, struct coresight_platform_data *pdata) { - /* List of output port on this component */ - pdata->outports = devm_kcalloc(dev, - pdata->nr_outport, - sizeof(*pdata->outports), - GFP_KERNEL); - if (!pdata->outports) - return -ENOMEM; - - /* Children connected to this component via @outports */ - pdata->child_names = devm_kcalloc(dev, - pdata->nr_outport, - sizeof(*pdata->child_names), - GFP_KERNEL); - if (!pdata->child_names) - return -ENOMEM; - - /* Port number on the child this component is connected to */ - pdata->child_ports = devm_kcalloc(dev, - pdata->nr_outport, - sizeof(*pdata->child_ports), - GFP_KERNEL); - if (!pdata->child_ports) - return -ENOMEM; + if (pdata->nr_outport) { + pdata->conns = devm_kzalloc(dev, pdata->nr_outport * + sizeof(*pdata->conns), + GFP_KERNEL); + if (!pdata->conns) + return -ENOMEM; + } return 0; } @@ -114,17 +164,78 @@ int of_coresight_get_cpu(const struct device_node *node) } EXPORT_SYMBOL_GPL(of_coresight_get_cpu); +/* + * of_coresight_parse_endpoint : Parse the given output endpoint @ep + * and fill the connection information in @conn + * + * Parses the local port, remote device name and the remote port. + * + * Returns : + * 1 - If the parsing is successful and a connection record + * was created for an output connection. + * 0 - If the parsing completed without any fatal errors. + * -Errno - Fatal error, abort the scanning. + */ +static int of_coresight_parse_endpoint(struct device *dev, + struct device_node *ep, + struct coresight_connection *conn) +{ + int ret = 0; + struct of_endpoint endpoint, rendpoint; + struct device_node *rparent = NULL; + struct device_node *rep = NULL; + struct device *rdev = NULL; + + do { + /* Parse the local port details */ + if (of_graph_parse_endpoint(ep, &endpoint)) + break; + /* + * Get a handle on the remote endpoint and the device it is + * attached to. + */ + rep = of_graph_get_remote_endpoint(ep); + if (!rep) + break; + rparent = of_coresight_get_port_parent(rep); + if (!rparent) + break; + if (of_graph_parse_endpoint(rep, &rendpoint)) + break; + + /* If the remote device is not available, defer probing */ + rdev = of_coresight_get_endpoint_device(rparent); + if (!rdev) { + ret = -EPROBE_DEFER; + break; + } + + conn->outport = endpoint.port; + conn->child_name = devm_kstrdup(dev, + dev_name(rdev), + GFP_KERNEL); + conn->child_port = rendpoint.port; + /* Connection record updated */ + ret = 1; + } while (0); + + of_node_put(rparent); + of_node_put(rep); + put_device(rdev); + + return ret; +} + struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const struct device_node *node) { - int i = 0, ret = 0; + int ret = 0; struct coresight_platform_data *pdata; - struct of_endpoint endpoint, rendpoint; - struct device *rdev; + struct coresight_connection *conn; struct device_node *ep = NULL; - struct device_node *rparent = NULL; - struct device_node *rport = NULL; + const struct device_node *parent = NULL; + bool legacy_binding = false; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) @@ -132,63 +243,54 @@ of_get_coresight_platform_data(struct device *dev, /* Use device name as sysfs handle */ pdata->name = dev_name(dev); + pdata->cpu = of_coresight_get_cpu(node); /* Get the number of input and output port for this component */ of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); - if (pdata->nr_outport) { - ret = of_coresight_alloc_memory(dev, pdata); - if (ret) - return ERR_PTR(ret); - - /* Iterate through each port to discover topology */ - do { - /* Get a handle on a port */ - ep = of_graph_get_next_endpoint(node, ep); - if (!ep) - break; - - /* - * No need to deal with input ports, processing for as - * processing for output ports will deal with them. - */ - if (of_find_property(ep, "slave-mode", NULL)) - continue; - - /* Get a handle on the local endpoint */ - ret = of_graph_parse_endpoint(ep, &endpoint); - - if (ret) - continue; - - /* The local out port number */ - pdata->outports[i] = endpoint.port; - - /* - * Get a handle on the remote port and parent - * attached to it. - */ - rparent = of_graph_get_remote_port_parent(ep); - rport = of_graph_get_remote_port(ep); - - if (!rparent || !rport) - continue; + /* If there are no output connections, we are done */ + if (!pdata->nr_outport) + return pdata; - if (of_graph_parse_endpoint(rport, &rendpoint)) - continue; + ret = of_coresight_alloc_memory(dev, pdata); + if (ret) + return ERR_PTR(ret); - rdev = of_coresight_get_endpoint_device(rparent); - if (!rdev) - return ERR_PTR(-EPROBE_DEFER); - - pdata->child_names[i] = dev_name(rdev); - pdata->child_ports[i] = rendpoint.id; - - i++; - } while (ep); + parent = of_coresight_get_output_ports_node(node); + /* + * If the DT uses obsoleted bindings, the ports are listed + * under the device and we need to filter out the input + * ports. + */ + if (!parent) { + legacy_binding = true; + parent = node; + dev_warn_once(dev, "Uses obsolete Coresight DT bindings\n"); } - pdata->cpu = of_coresight_get_cpu(node); + conn = pdata->conns; + + /* Iterate through each output port to discover topology */ + while ((ep = of_graph_get_next_endpoint(parent, ep))) { + /* + * Legacy binding mixes input/output ports under the + * same parent. So, skip the input ports if we are dealing + * with legacy binding, as they processed with their + * connected output ports. + */ + if (legacy_binding && of_coresight_legacy_ep_is_input(ep)) + continue; + + ret = of_coresight_parse_endpoint(dev, ep, conn); + switch (ret) { + case 1: + conn++; /* Fall through */ + case 0: + break; + default: + return ERR_PTR(ret); + } + } return pdata; } diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig @@ -11,6 +11,35 @@ config STM if STM +config STM_PROTO_BASIC + tristate "Basic STM framing protocol driver" + default CONFIG_STM + help + This is a simple framing protocol for sending data over STM + devices. This was the protocol that the STM framework used + exclusively until the MIPI SyS-T support was added. Use this + driver for compatibility with your existing STM setup. + + The receiving side only needs to be able to decode the MIPI + STP protocol in order to extract the data. + + If you want to be able to use the basic protocol or want the + backwards compatibility for your existing setup, say Y. + +config STM_PROTO_SYS_T + tristate "MIPI SyS-T STM framing protocol driver" + default CONFIG_STM + help + This is an implementation of MIPI SyS-T protocol to be used + over the STP transport. In addition to the data payload, it + also carries additional metadata for time correlation, better + means of trace source identification, etc. + + The receiving side must be able to decode this protocol in + addition to the MIPI STP, in order to extract the data. + + If you don't know what this is, say N. + config STM_DUMMY tristate "Dummy STM driver" help diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile @@ -3,6 +3,12 @@ obj-$(CONFIG_STM) += stm_core.o stm_core-y := core.o policy.o +obj-$(CONFIG_STM_PROTO_BASIC) += stm_p_basic.o +obj-$(CONFIG_STM_PROTO_SYS_T) += stm_p_sys-t.o + +stm_p_basic-y := p_basic.o +stm_p_sys-t-y := p_sys-t.o + obj-$(CONFIG_STM_DUMMY) += dummy_stm.o obj-$(CONFIG_STM_SOURCE_CONSOLE) += stm_console.o diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c @@ -293,15 +293,15 @@ static int stm_output_assign(struct stm_device *stm, unsigned int width, if (width > stm->data->sw_nchannels) return -EINVAL; - if (policy_node) { - stp_policy_node_get_ranges(policy_node, - &midx, &mend, &cidx, &cend); - } else { - midx = stm->data->sw_start; - cidx = 0; - mend = stm->data->sw_end; - cend = stm->data->sw_nchannels - 1; - } + /* We no longer accept policy_node==NULL here */ + if (WARN_ON_ONCE(!policy_node)) + return -EINVAL; + + /* + * Also, the caller holds reference to policy_node, so it won't + * disappear on us. + */ + stp_policy_node_get_ranges(policy_node, &midx, &mend, &cidx, &cend); spin_lock(&stm->mc_lock); spin_lock(&output->lock); @@ -316,11 +316,26 @@ static int stm_output_assign(struct stm_device *stm, unsigned int width, output->master = midx; output->channel = cidx; output->nr_chans = width; + if (stm->pdrv->output_open) { + void *priv = stp_policy_node_priv(policy_node); + + if (WARN_ON_ONCE(!priv)) + goto unlock; + + /* configfs subsys mutex is held by the caller */ + ret = stm->pdrv->output_open(priv, output); + if (ret) + goto unlock; + } + stm_output_claim(stm, output); dev_dbg(&stm->dev, "assigned %u:%u (+%u)\n", midx, cidx, width); ret = 0; unlock: + if (ret) + output->nr_chans = 0; + spin_unlock(&output->lock); spin_unlock(&stm->mc_lock); @@ -333,6 +348,8 @@ static void stm_output_free(struct stm_device *stm, struct stm_output *output) spin_lock(&output->lock); if (output->nr_chans) stm_output_disclaim(stm, output); + if (stm->pdrv && stm->pdrv->output_close) + stm->pdrv->output_close(output); spin_unlock(&output->lock); spin_unlock(&stm->mc_lock); } @@ -349,6 +366,127 @@ static int major_match(struct device *dev, const void *data) return MAJOR(dev->devt) == major; } +/* + * Framing protocol management + * Modules can implement STM protocol drivers and (un-)register them + * with the STM class framework. + */ +static struct list_head stm_pdrv_head; +static struct mutex stm_pdrv_mutex; + +struct stm_pdrv_entry { + struct list_head entry; + const struct stm_protocol_driver *pdrv; + const struct config_item_type *node_type; +}; + +static const struct stm_pdrv_entry * +__stm_lookup_protocol(const char *name) +{ + struct stm_pdrv_entry *pe; + + /* + * If no name is given (NULL or ""), fall back to "p_basic". + */ + if (!name || !*name) + name = "p_basic"; + + list_for_each_entry(pe, &stm_pdrv_head, entry) { + if (!strcmp(name, pe->pdrv->name)) + return pe; + } + + return NULL; +} + +int stm_register_protocol(const struct stm_protocol_driver *pdrv) +{ + struct stm_pdrv_entry *pe = NULL; + int ret = -ENOMEM; + + mutex_lock(&stm_pdrv_mutex); + + if (__stm_lookup_protocol(pdrv->name)) { + ret = -EEXIST; + goto unlock; + } + + pe = kzalloc(sizeof(*pe), GFP_KERNEL); + if (!pe) + goto unlock; + + if (pdrv->policy_attr) { + pe->node_type = get_policy_node_type(pdrv->policy_attr); + if (!pe->node_type) + goto unlock; + } + + list_add_tail(&pe->entry, &stm_pdrv_head); + pe->pdrv = pdrv; + + ret = 0; +unlock: + mutex_unlock(&stm_pdrv_mutex); + + if (ret) + kfree(pe); + + return ret; +} +EXPORT_SYMBOL_GPL(stm_register_protocol); + +void stm_unregister_protocol(const struct stm_protocol_driver *pdrv) +{ + struct stm_pdrv_entry *pe, *iter; + + mutex_lock(&stm_pdrv_mutex); + + list_for_each_entry_safe(pe, iter, &stm_pdrv_head, entry) { + if (pe->pdrv == pdrv) { + list_del(&pe->entry); + + if (pe->node_type) { + kfree(pe->node_type->ct_attrs); + kfree(pe->node_type); + } + kfree(pe); + break; + } + } + + mutex_unlock(&stm_pdrv_mutex); +} +EXPORT_SYMBOL_GPL(stm_unregister_protocol); + +static bool stm_get_protocol(const struct stm_protocol_driver *pdrv) +{ + return try_module_get(pdrv->owner); +} + +void stm_put_protocol(const struct stm_protocol_driver *pdrv) +{ + module_put(pdrv->owner); +} + +int stm_lookup_protocol(const char *name, + const struct stm_protocol_driver **pdrv, + const struct config_item_type **node_type) +{ + const struct stm_pdrv_entry *pe; + + mutex_lock(&stm_pdrv_mutex); + + pe = __stm_lookup_protocol(name); + if (pe && pe->pdrv && stm_get_protocol(pe->pdrv)) { + *pdrv = pe->pdrv; + *node_type = pe->node_type; + } + + mutex_unlock(&stm_pdrv_mutex); + + return pe ? 0 : -ENOENT; +} + static int stm_char_open(struct inode *inode, struct file *file) { struct stm_file *stmf; @@ -405,42 +543,81 @@ static int stm_char_release(struct inode *inode, struct file *file) return 0; } -static int stm_file_assign(struct stm_file *stmf, char *id, unsigned int width) +static int +stm_assign_first_policy(struct stm_device *stm, struct stm_output *output, + char **ids, unsigned int width) { - struct stm_device *stm = stmf->stm; - int ret; + struct stp_policy_node *pn; + int err, n; - stmf->policy_node = stp_policy_node_lookup(stm, id); + /* + * On success, stp_policy_node_lookup() will return holding the + * configfs subsystem mutex, which is then released in + * stp_policy_node_put(). This allows the pdrv->output_open() in + * stm_output_assign() to serialize against the attribute accessors. + */ + for (n = 0, pn = NULL; ids[n] && !pn; n++) + pn = stp_policy_node_lookup(stm, ids[n]); - ret = stm_output_assign(stm, width, stmf->policy_node, &stmf->output); + if (!pn) + return -EINVAL; - if (stmf->policy_node) - stp_policy_node_put(stmf->policy_node); + err = stm_output_assign(stm, width, pn, output); - return ret; + stp_policy_node_put(pn); + + return err; } -static ssize_t notrace stm_write(struct stm_data *data, unsigned int master, - unsigned int channel, const char *buf, size_t count) +/** + * stm_data_write() - send the given payload as data packets + * @data: stm driver's data + * @m: STP master + * @c: STP channel + * @ts_first: timestamp the first packet + * @buf: data payload buffer + * @count: data payload size + */ +ssize_t notrace stm_data_write(struct stm_data *data, unsigned int m, + unsigned int c, bool ts_first, const void *buf, + size_t count) { - unsigned int flags = STP_PACKET_TIMESTAMPED; - const unsigned char *p = buf, nil = 0; - size_t pos; + unsigned int flags = ts_first ? STP_PACKET_TIMESTAMPED : 0; ssize_t sz; + size_t pos; - for (pos = 0, p = buf; count > pos; pos += sz, p += sz) { + for (pos = 0, sz = 0; pos < count; pos += sz) { sz = min_t(unsigned int, count - pos, 8); - sz = data->packet(data, master, channel, STP_PACKET_DATA, flags, - sz, p); - flags = 0; - - if (sz < 0) + sz = data->packet(data, m, c, STP_PACKET_DATA, flags, sz, + &((u8 *)buf)[pos]); + if (sz <= 0) break; + + if (ts_first) { + flags = 0; + ts_first = false; + } } - data->packet(data, master, channel, STP_PACKET_FLAG, 0, 0, &nil); + return sz < 0 ? sz : pos; +} +EXPORT_SYMBOL_GPL(stm_data_write); + +static ssize_t notrace +stm_write(struct stm_device *stm, struct stm_output *output, + unsigned int chan, const char *buf, size_t count) +{ + int err; + + /* stm->pdrv is serialized against policy_mutex */ + if (!stm->pdrv) + return -ENODEV; + + err = stm->pdrv->write(stm->data, output, chan, buf, count); + if (err < 0) + return err; - return pos; + return err; } static ssize_t stm_char_write(struct file *file, const char __user *buf, @@ -455,16 +632,21 @@ static ssize_t stm_char_write(struct file *file, const char __user *buf, count = PAGE_SIZE - 1; /* - * if no m/c have been assigned to this writer up to this - * point, use "default" policy entry + * If no m/c have been assigned to this writer up to this + * point, try to use the task name and "default" policy entries. */ if (!stmf->output.nr_chans) { - err = stm_file_assign(stmf, "default", 1); + char comm[sizeof(current->comm)]; + char *ids[] = { comm, "default", NULL }; + + get_task_comm(comm, current); + + err = stm_assign_first_policy(stmf->stm, &stmf->output, ids, 1); /* * EBUSY means that somebody else just assigned this * output, which is just fine for write() */ - if (err && err != -EBUSY) + if (err) return err; } @@ -480,8 +662,7 @@ static ssize_t stm_char_write(struct file *file, const char __user *buf, pm_runtime_get_sync(&stm->dev); - count = stm_write(stm->data, stmf->output.master, stmf->output.channel, - kbuf, count); + count = stm_write(stm, &stmf->output, 0, kbuf, count); pm_runtime_mark_last_busy(&stm->dev); pm_runtime_put_autosuspend(&stm->dev); @@ -550,6 +731,7 @@ static int stm_char_policy_set_ioctl(struct stm_file *stmf, void __user *arg) { struct stm_device *stm = stmf->stm; struct stp_policy_id *id; + char *ids[] = { NULL, NULL }; int ret = -EINVAL; u32 size; @@ -582,7 +764,9 @@ static int stm_char_policy_set_ioctl(struct stm_file *stmf, void __user *arg) id->width > PAGE_SIZE / stm->data->sw_mmiosz) goto err_free; - ret = stm_file_assign(stmf, id->id, id->width); + ids[0] = id->id; + ret = stm_assign_first_policy(stmf->stm, &stmf->output, ids, + id->width); if (ret) goto err_free; @@ -818,8 +1002,8 @@ EXPORT_SYMBOL_GPL(stm_unregister_device); static int stm_source_link_add(struct stm_source_device *src, struct stm_device *stm) { - char *id; - int err; + char *ids[] = { NULL, "default", NULL }; + int err = -ENOMEM; mutex_lock(&stm->link_mutex); spin_lock(&stm->link_lock); @@ -833,19 +1017,13 @@ static int stm_source_link_add(struct stm_source_device *src, spin_unlock(&stm->link_lock); mutex_unlock(&stm->link_mutex); - id = kstrdup(src->data->name, GFP_KERNEL); - if (id) { - src->policy_node = - stp_policy_node_lookup(stm, id); - - kfree(id); - } - - err = stm_output_assign(stm, src->data->nr_chans, - src->policy_node, &src->output); + ids[0] = kstrdup(src->data->name, GFP_KERNEL); + if (!ids[0]) + goto fail_detach; - if (src->policy_node) - stp_policy_node_put(src->policy_node); + err = stm_assign_first_policy(stm, &src->output, ids, + src->data->nr_chans); + kfree(ids[0]); if (err) goto fail_detach; @@ -1134,9 +1312,7 @@ int notrace stm_source_write(struct stm_source_data *data, stm = srcu_dereference(src->link, &stm_source_srcu); if (stm) - count = stm_write(stm->data, src->output.master, - src->output.channel + chan, - buf, count); + count = stm_write(stm, &src->output, chan, buf, count); else count = -ENODEV; @@ -1163,7 +1339,15 @@ static int __init stm_core_init(void) goto err_src; init_srcu_struct(&stm_source_srcu); + INIT_LIST_HEAD(&stm_pdrv_head); + mutex_init(&stm_pdrv_mutex); + /* + * So as to not confuse existing users with a requirement + * to load yet another module, do it here. + */ + if (IS_ENABLED(CONFIG_STM_PROTO_BASIC)) + (void)request_module_nowait("stm_p_basic"); stm_core_up++; return 0; diff --git a/drivers/hwtracing/stm/heartbeat.c b/drivers/hwtracing/stm/heartbeat.c @@ -76,7 +76,7 @@ static int stm_heartbeat_init(void) goto fail_unregister; stm_heartbeat[i].data.nr_chans = 1; - stm_heartbeat[i].data.link = stm_heartbeat_link; + stm_heartbeat[i].data.link = stm_heartbeat_link; stm_heartbeat[i].data.unlink = stm_heartbeat_unlink; hrtimer_init(&stm_heartbeat[i].hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); diff --git a/drivers/hwtracing/stm/p_basic.c b/drivers/hwtracing/stm/p_basic.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Basic framing protocol for STM devices. + * Copyright (c) 2018, Intel Corporation. + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/stm.h> +#include "stm.h" + +static ssize_t basic_write(struct stm_data *data, struct stm_output *output, + unsigned int chan, const char *buf, size_t count) +{ + unsigned int c = output->channel + chan; + unsigned int m = output->master; + const unsigned char nil = 0; + ssize_t sz; + + sz = stm_data_write(data, m, c, true, buf, count); + if (sz > 0) + data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil); + + return sz; +} + +static const struct stm_protocol_driver basic_pdrv = { + .owner = THIS_MODULE, + .name = "p_basic", + .write = basic_write, +}; + +static int basic_stm_init(void) +{ + return stm_register_protocol(&basic_pdrv); +} + +static void basic_stm_exit(void) +{ + stm_unregister_protocol(&basic_pdrv); +} + +module_init(basic_stm_init); +module_exit(basic_stm_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Basic STM framing protocol driver"); +MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); diff --git a/drivers/hwtracing/stm/p_sys-t.c b/drivers/hwtracing/stm/p_sys-t.c @@ -0,0 +1,382 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MIPI SyS-T framing protocol for STM devices. + * Copyright (c) 2018, Intel Corporation. + */ + +#include <linux/configfs.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/uuid.h> +#include <linux/stm.h> +#include "stm.h" + +enum sys_t_message_type { + MIPI_SYST_TYPE_BUILD = 0, + MIPI_SYST_TYPE_SHORT32, + MIPI_SYST_TYPE_STRING, + MIPI_SYST_TYPE_CATALOG, + MIPI_SYST_TYPE_RAW = 6, + MIPI_SYST_TYPE_SHORT64, + MIPI_SYST_TYPE_CLOCK, +}; + +enum sys_t_message_severity { + MIPI_SYST_SEVERITY_MAX = 0, + MIPI_SYST_SEVERITY_FATAL, + MIPI_SYST_SEVERITY_ERROR, + MIPI_SYST_SEVERITY_WARNING, + MIPI_SYST_SEVERITY_INFO, + MIPI_SYST_SEVERITY_USER1, + MIPI_SYST_SEVERITY_USER2, + MIPI_SYST_SEVERITY_DEBUG, +}; + +enum sys_t_message_build_subtype { + MIPI_SYST_BUILD_ID_COMPACT32 = 0, + MIPI_SYST_BUILD_ID_COMPACT64, + MIPI_SYST_BUILD_ID_LONG, +}; + +enum sys_t_message_clock_subtype { + MIPI_SYST_CLOCK_TRANSPORT_SYNC = 1, +}; + +enum sys_t_message_string_subtype { + MIPI_SYST_STRING_GENERIC = 1, + MIPI_SYST_STRING_FUNCTIONENTER, + MIPI_SYST_STRING_FUNCTIONEXIT, + MIPI_SYST_STRING_INVALIDPARAM = 5, + MIPI_SYST_STRING_ASSERT = 7, + MIPI_SYST_STRING_PRINTF_32 = 11, + MIPI_SYST_STRING_PRINTF_64 = 12, +}; + +#define MIPI_SYST_TYPE(t) ((u32)(MIPI_SYST_TYPE_ ## t)) +#define MIPI_SYST_SEVERITY(s) ((u32)(MIPI_SYST_SEVERITY_ ## s) << 4) +#define MIPI_SYST_OPT_LOC BIT(8) +#define MIPI_SYST_OPT_LEN BIT(9) +#define MIPI_SYST_OPT_CHK BIT(10) +#define MIPI_SYST_OPT_TS BIT(11) +#define MIPI_SYST_UNIT(u) ((u32)(u) << 12) +#define MIPI_SYST_ORIGIN(o) ((u32)(o) << 16) +#define MIPI_SYST_OPT_GUID BIT(23) +#define MIPI_SYST_SUBTYPE(s) ((u32)(MIPI_SYST_ ## s) << 24) +#define MIPI_SYST_UNITLARGE(u) (MIPI_SYST_UNIT(u & 0xf) | \ + MIPI_SYST_ORIGIN(u >> 4)) +#define MIPI_SYST_TYPES(t, s) (MIPI_SYST_TYPE(t) | \ + MIPI_SYST_SUBTYPE(t ## _ ## s)) + +#define DATA_HEADER (MIPI_SYST_TYPES(STRING, GENERIC) | \ + MIPI_SYST_SEVERITY(INFO) | \ + MIPI_SYST_OPT_GUID) + +#define CLOCK_SYNC_HEADER (MIPI_SYST_TYPES(CLOCK, TRANSPORT_SYNC) | \ + MIPI_SYST_SEVERITY(MAX)) + +struct sys_t_policy_node { + uuid_t uuid; + bool do_len; + unsigned long ts_interval; + unsigned long clocksync_interval; +}; + +struct sys_t_output { + struct sys_t_policy_node node; + unsigned long ts_jiffies; + unsigned long clocksync_jiffies; +}; + +static void sys_t_policy_node_init(void *priv) +{ + struct sys_t_policy_node *pn = priv; + + generate_random_uuid(pn->uuid.b); +} + +static int sys_t_output_open(void *priv, struct stm_output *output) +{ + struct sys_t_policy_node *pn = priv; + struct sys_t_output *opriv; + + opriv = kzalloc(sizeof(*opriv), GFP_ATOMIC); + if (!opriv) + return -ENOMEM; + + memcpy(&opriv->node, pn, sizeof(opriv->node)); + output->pdrv_private = opriv; + + return 0; +} + +static void sys_t_output_close(struct stm_output *output) +{ + kfree(output->pdrv_private); +} + +static ssize_t sys_t_policy_uuid_show(struct config_item *item, + char *page) +{ + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + + return sprintf(page, "%pU\n", &pn->uuid); +} + +static ssize_t +sys_t_policy_uuid_store(struct config_item *item, const char *page, + size_t count) +{ + struct mutex *mutexp = &item->ci_group->cg_subsys->su_mutex; + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + int ret; + + mutex_lock(mutexp); + ret = uuid_parse(page, &pn->uuid); + mutex_unlock(mutexp); + + return ret < 0 ? ret : count; +} + +CONFIGFS_ATTR(sys_t_policy_, uuid); + +static ssize_t sys_t_policy_do_len_show(struct config_item *item, + char *page) +{ + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + + return sprintf(page, "%d\n", pn->do_len); +} + +static ssize_t +sys_t_policy_do_len_store(struct config_item *item, const char *page, + size_t count) +{ + struct mutex *mutexp = &item->ci_group->cg_subsys->su_mutex; + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + int ret; + + mutex_lock(mutexp); + ret = kstrtobool(page, &pn->do_len); + mutex_unlock(mutexp); + + return ret ? ret : count; +} + +CONFIGFS_ATTR(sys_t_policy_, do_len); + +static ssize_t sys_t_policy_ts_interval_show(struct config_item *item, + char *page) +{ + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + + return sprintf(page, "%u\n", jiffies_to_msecs(pn->ts_interval)); +} + +static ssize_t +sys_t_policy_ts_interval_store(struct config_item *item, const char *page, + size_t count) +{ + struct mutex *mutexp = &item->ci_group->cg_subsys->su_mutex; + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + unsigned int ms; + int ret; + + mutex_lock(mutexp); + ret = kstrtouint(page, 10, &ms); + mutex_unlock(mutexp); + + if (!ret) { + pn->ts_interval = msecs_to_jiffies(ms); + return count; + } + + return ret; +} + +CONFIGFS_ATTR(sys_t_policy_, ts_interval); + +static ssize_t sys_t_policy_clocksync_interval_show(struct config_item *item, + char *page) +{ + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + + return sprintf(page, "%u\n", jiffies_to_msecs(pn->clocksync_interval)); +} + +static ssize_t +sys_t_policy_clocksync_interval_store(struct config_item *item, + const char *page, size_t count) +{ + struct mutex *mutexp = &item->ci_group->cg_subsys->su_mutex; + struct sys_t_policy_node *pn = to_pdrv_policy_node(item); + unsigned int ms; + int ret; + + mutex_lock(mutexp); + ret = kstrtouint(page, 10, &ms); + mutex_unlock(mutexp); + + if (!ret) { + pn->clocksync_interval = msecs_to_jiffies(ms); + return count; + } + + return ret; +} + +CONFIGFS_ATTR(sys_t_policy_, clocksync_interval); + +static struct configfs_attribute *sys_t_policy_attrs[] = { + &sys_t_policy_attr_uuid, + &sys_t_policy_attr_do_len, + &sys_t_policy_attr_ts_interval, + &sys_t_policy_attr_clocksync_interval, + NULL, +}; + +static inline bool sys_t_need_ts(struct sys_t_output *op) +{ + if (op->node.ts_interval && + time_after(op->ts_jiffies + op->node.ts_interval, jiffies)) { + op->ts_jiffies = jiffies; + + return true; + } + + return false; +} + +static bool sys_t_need_clock_sync(struct sys_t_output *op) +{ + if (op->node.clocksync_interval && + time_after(op->clocksync_jiffies + op->node.clocksync_interval, + jiffies)) { + op->clocksync_jiffies = jiffies; + + return true; + } + + return false; +} + +static ssize_t +sys_t_clock_sync(struct stm_data *data, unsigned int m, unsigned int c) +{ + u32 header = CLOCK_SYNC_HEADER; + const unsigned char nil = 0; + u64 payload[2]; /* Clock value and frequency */ + ssize_t sz; + + sz = data->packet(data, m, c, STP_PACKET_DATA, STP_PACKET_TIMESTAMPED, + 4, (u8 *)&header); + if (sz <= 0) + return sz; + + payload[0] = ktime_get_real_ns(); + payload[1] = NSEC_PER_SEC; + sz = stm_data_write(data, m, c, false, &payload, sizeof(payload)); + if (sz <= 0) + return sz; + + data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil); + + return sizeof(header) + sizeof(payload); +} + +static ssize_t sys_t_write(struct stm_data *data, struct stm_output *output, + unsigned int chan, const char *buf, size_t count) +{ + struct sys_t_output *op = output->pdrv_private; + unsigned int c = output->channel + chan; + unsigned int m = output->master; + const unsigned char nil = 0; + u32 header = DATA_HEADER; + ssize_t sz; + + /* We require an existing policy node to proceed */ + if (!op) + return -EINVAL; + + if (sys_t_need_clock_sync(op)) { + sz = sys_t_clock_sync(data, m, c); + if (sz <= 0) + return sz; + } + + if (op->node.do_len) + header |= MIPI_SYST_OPT_LEN; + if (sys_t_need_ts(op)) + header |= MIPI_SYST_OPT_TS; + + /* + * STP framing rules for SyS-T frames: + * * the first packet of the SyS-T frame is timestamped; + * * the last packet is a FLAG. + */ + /* Message layout: HEADER / GUID / [LENGTH /][TIMESTAMP /] DATA */ + /* HEADER */ + sz = data->packet(data, m, c, STP_PACKET_DATA, STP_PACKET_TIMESTAMPED, + 4, (u8 *)&header); + if (sz <= 0) + return sz; + + /* GUID */ + sz = stm_data_write(data, m, c, false, op->node.uuid.b, UUID_SIZE); + if (sz <= 0) + return sz; + + /* [LENGTH] */ + if (op->node.do_len) { + u16 length = count; + + sz = data->packet(data, m, c, STP_PACKET_DATA, 0, 2, + (u8 *)&length); + if (sz <= 0) + return sz; + } + + /* [TIMESTAMP] */ + if (header & MIPI_SYST_OPT_TS) { + u64 ts = ktime_get_real_ns(); + + sz = stm_data_write(data, m, c, false, &ts, sizeof(ts)); + if (sz <= 0) + return sz; + } + + /* DATA */ + sz = stm_data_write(data, m, c, false, buf, count); + if (sz > 0) + data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil); + + return sz; +} + +static const struct stm_protocol_driver sys_t_pdrv = { + .owner = THIS_MODULE, + .name = "p_sys-t", + .priv_sz = sizeof(struct sys_t_policy_node), + .write = sys_t_write, + .policy_attr = sys_t_policy_attrs, + .policy_node_init = sys_t_policy_node_init, + .output_open = sys_t_output_open, + .output_close = sys_t_output_close, +}; + +static int sys_t_stm_init(void) +{ + return stm_register_protocol(&sys_t_pdrv); +} + +static void sys_t_stm_exit(void) +{ + stm_unregister_protocol(&sys_t_pdrv); +} + +module_init(sys_t_stm_init); +module_exit(sys_t_stm_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("MIPI SyS-T STM framing protocol driver"); +MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); diff --git a/drivers/hwtracing/stm/policy.c b/drivers/hwtracing/stm/policy.c @@ -33,8 +33,18 @@ struct stp_policy_node { unsigned int last_master; unsigned int first_channel; unsigned int last_channel; + /* this is the one that's exposed to the attributes */ + unsigned char priv[0]; }; +void *stp_policy_node_priv(struct stp_policy_node *pn) +{ + if (!pn) + return NULL; + + return pn->priv; +} + static struct configfs_subsystem stp_policy_subsys; void stp_policy_node_get_ranges(struct stp_policy_node *policy_node, @@ -68,6 +78,14 @@ to_stp_policy_node(struct config_item *item) NULL; } +void *to_pdrv_policy_node(struct config_item *item) +{ + struct stp_policy_node *node = to_stp_policy_node(item); + + return stp_policy_node_priv(node); +} +EXPORT_SYMBOL_GPL(to_pdrv_policy_node); + static ssize_t stp_policy_node_masters_show(struct config_item *item, char *page) { @@ -163,7 +181,9 @@ unlock: static void stp_policy_node_release(struct config_item *item) { - kfree(to_stp_policy_node(item)); + struct stp_policy_node *node = to_stp_policy_node(item); + + kfree(node); } static struct configfs_item_operations stp_policy_node_item_ops = { @@ -182,10 +202,34 @@ static struct configfs_attribute *stp_policy_node_attrs[] = { static const struct config_item_type stp_policy_type; static const struct config_item_type stp_policy_node_type; +const struct config_item_type * +get_policy_node_type(struct configfs_attribute **attrs) +{ + struct config_item_type *type; + struct configfs_attribute **merged; + + type = kmemdup(&stp_policy_node_type, sizeof(stp_policy_node_type), + GFP_KERNEL); + if (!type) + return NULL; + + merged = memcat_p(stp_policy_node_attrs, attrs); + if (!merged) { + kfree(type); + return NULL; + } + + type->ct_attrs = merged; + + return type; +} + static struct config_group * stp_policy_node_make(struct config_group *group, const char *name) { + const struct config_item_type *type = &stp_policy_node_type; struct stp_policy_node *policy_node, *parent_node; + const struct stm_protocol_driver *pdrv; struct stp_policy *policy; if (group->cg_item.ci_type == &stp_policy_type) { @@ -199,12 +243,20 @@ stp_policy_node_make(struct config_group *group, const char *name) if (!policy->stm) return ERR_PTR(-ENODEV); - policy_node = kzalloc(sizeof(struct stp_policy_node), GFP_KERNEL); + pdrv = policy->stm->pdrv; + policy_node = + kzalloc(offsetof(struct stp_policy_node, priv[pdrv->priv_sz]), + GFP_KERNEL); if (!policy_node) return ERR_PTR(-ENOMEM); - config_group_init_type_name(&policy_node->group, name, - &stp_policy_node_type); + if (pdrv->policy_node_init) + pdrv->policy_node_init((void *)policy_node->priv); + + if (policy->stm->pdrv_node_type) + type = policy->stm->pdrv_node_type; + + config_group_init_type_name(&policy_node->group, name, type); policy_node->policy = policy; @@ -254,8 +306,25 @@ static ssize_t stp_policy_device_show(struct config_item *item, CONFIGFS_ATTR_RO(stp_policy_, device); +static ssize_t stp_policy_protocol_show(struct config_item *item, + char *page) +{ + struct stp_policy *policy = to_stp_policy(item); + ssize_t count; + + count = sprintf(page, "%s\n", + (policy && policy->stm) ? + policy->stm->pdrv->name : + "<none>"); + + return count; +} + +CONFIGFS_ATTR_RO(stp_policy_, protocol); + static struct configfs_attribute *stp_policy_attrs[] = { &stp_policy_attr_device, + &stp_policy_attr_protocol, NULL, }; @@ -276,6 +345,7 @@ void stp_policy_unbind(struct stp_policy *policy) stm->policy = NULL; policy->stm = NULL; + stm_put_protocol(stm->pdrv); stm_put_device(stm); } @@ -311,11 +381,14 @@ static const struct config_item_type stp_policy_type = { }; static struct config_group * -stp_policies_make(struct config_group *group, const char *name) +stp_policy_make(struct config_group *group, const char *name) { + const struct config_item_type *pdrv_node_type; + const struct stm_protocol_driver *pdrv; + char *devname, *proto, *p; struct config_group *ret; struct stm_device *stm; - char *devname, *p; + int err; devname = kasprintf(GFP_KERNEL, "%s", name); if (!devname) @@ -326,6 +399,7 @@ stp_policies_make(struct config_group *group, const char *name) * <device_name> is the name of an existing stm device; may * contain dots; * <policy_name> is an arbitrary string; may not contain dots + * <device_name>:<protocol_name>.<policy_name> */ p = strrchr(devname, '.'); if (!p) { @@ -335,11 +409,28 @@ stp_policies_make(struct config_group *group, const char *name) *p = '\0'; + /* + * look for ":<protocol_name>": + * + no protocol suffix: fall back to whatever is available; + * + unknown protocol: fail the whole thing + */ + proto = strrchr(devname, ':'); + if (proto) + *proto++ = '\0'; + stm = stm_find_device(devname); + if (!stm) { + kfree(devname); + return ERR_PTR(-ENODEV); + } + + err = stm_lookup_protocol(proto, &pdrv, &pdrv_node_type); kfree(devname); - if (!stm) + if (err) { + stm_put_device(stm); return ERR_PTR(-ENODEV); + } mutex_lock(&stm->policy_mutex); if (stm->policy) { @@ -349,31 +440,37 @@ stp_policies_make(struct config_group *group, const char *name) stm->policy = kzalloc(sizeof(*stm->policy), GFP_KERNEL); if (!stm->policy) { - ret = ERR_PTR(-ENOMEM); - goto unlock_policy; + mutex_unlock(&stm->policy_mutex); + stm_put_protocol(pdrv); + stm_put_device(stm); + return ERR_PTR(-ENOMEM); } config_group_init_type_name(&stm->policy->group, name, &stp_policy_type); - stm->policy->stm = stm; + stm->pdrv = pdrv; + stm->pdrv_node_type = pdrv_node_type; + stm->policy->stm = stm; ret = &stm->policy->group; unlock_policy: mutex_unlock(&stm->policy_mutex); - if (IS_ERR(ret)) + if (IS_ERR(ret)) { + stm_put_protocol(stm->pdrv); stm_put_device(stm); + } return ret; } -static struct configfs_group_operations stp_policies_group_ops = { - .make_group = stp_policies_make, +static struct configfs_group_operations stp_policy_root_group_ops = { + .make_group = stp_policy_make, }; -static const struct config_item_type stp_policies_type = { - .ct_group_ops = &stp_policies_group_ops, +static const struct config_item_type stp_policy_root_type = { + .ct_group_ops = &stp_policy_root_group_ops, .ct_owner = THIS_MODULE, }; @@ -381,7 +478,7 @@ static struct configfs_subsystem stp_policy_subsys = { .su_group = { .cg_item = { .ci_namebuf = "stp-policy", - .ci_type = &stp_policies_type, + .ci_type = &stp_policy_root_type, }, }, }; @@ -392,7 +489,7 @@ static struct configfs_subsystem stp_policy_subsys = { static struct stp_policy_node * __stp_policy_node_lookup(struct stp_policy *policy, char *s) { - struct stp_policy_node *policy_node, *ret; + struct stp_policy_node *policy_node, *ret = NULL; struct list_head *head = &policy->group.cg_children; struct config_item *item; char *start, *end = s; @@ -400,10 +497,6 @@ __stp_policy_node_lookup(struct stp_policy *policy, char *s) if (list_empty(head)) return NULL; - /* return the first entry if everything else fails */ - item = list_entry(head->next, struct config_item, ci_entry); - ret = to_stp_policy_node(item); - next: for (;;) { start = strsep(&end, "/"); @@ -449,25 +542,25 @@ stp_policy_node_lookup(struct stm_device *stm, char *s) if (policy_node) config_item_get(&policy_node->group.cg_item); - mutex_unlock(&stp_policy_subsys.su_mutex); + else + mutex_unlock(&stp_policy_subsys.su_mutex); return policy_node; } void stp_policy_node_put(struct stp_policy_node *policy_node) { + lockdep_assert_held(&stp_policy_subsys.su_mutex); + + mutex_unlock(&stp_policy_subsys.su_mutex); config_item_put(&policy_node->group.cg_item); } int __init stp_configfs_init(void) { - int err; - config_group_init(&stp_policy_subsys.su_group); mutex_init(&stp_policy_subsys.su_mutex); - err = configfs_register_subsystem(&stp_policy_subsys); - - return err; + return configfs_register_subsystem(&stp_policy_subsys); } void __exit stp_configfs_exit(void) diff --git a/drivers/hwtracing/stm/stm.h b/drivers/hwtracing/stm/stm.h @@ -10,20 +10,17 @@ #ifndef _STM_STM_H_ #define _STM_STM_H_ +#include <linux/configfs.h> + struct stp_policy; struct stp_policy_node; +struct stm_protocol_driver; -struct stp_policy_node * -stp_policy_node_lookup(struct stm_device *stm, char *s); -void stp_policy_node_put(struct stp_policy_node *policy_node); -void stp_policy_unbind(struct stp_policy *policy); - -void stp_policy_node_get_ranges(struct stp_policy_node *policy_node, - unsigned int *mstart, unsigned int *mend, - unsigned int *cstart, unsigned int *cend); int stp_configfs_init(void); void stp_configfs_exit(void); +void *stp_policy_node_priv(struct stp_policy_node *pn); + struct stp_master { unsigned int nr_free; unsigned long chan_map[0]; @@ -40,6 +37,9 @@ struct stm_device { struct mutex link_mutex; spinlock_t link_lock; struct list_head link_list; + /* framing protocol in use */ + const struct stm_protocol_driver *pdrv; + const struct config_item_type *pdrv_node_type; /* master allocation */ spinlock_t mc_lock; struct stp_master *masters[0]; @@ -48,16 +48,28 @@ struct stm_device { #define to_stm_device(_d) \ container_of((_d), struct stm_device, dev) +struct stp_policy_node * +stp_policy_node_lookup(struct stm_device *stm, char *s); +void stp_policy_node_put(struct stp_policy_node *policy_node); +void stp_policy_unbind(struct stp_policy *policy); + +void stp_policy_node_get_ranges(struct stp_policy_node *policy_node, + unsigned int *mstart, unsigned int *mend, + unsigned int *cstart, unsigned int *cend); + +const struct config_item_type * +get_policy_node_type(struct configfs_attribute **attrs); + struct stm_output { spinlock_t lock; unsigned int master; unsigned int channel; unsigned int nr_chans; + void *pdrv_private; }; struct stm_file { struct stm_device *stm; - struct stp_policy_node *policy_node; struct stm_output output; }; @@ -71,11 +83,35 @@ struct stm_source_device { struct stm_device __rcu *link; struct list_head link_entry; /* one output per stm_source device */ - struct stp_policy_node *policy_node; struct stm_output output; }; #define to_stm_source_device(_d) \ container_of((_d), struct stm_source_device, dev) +void *to_pdrv_policy_node(struct config_item *item); + +struct stm_protocol_driver { + struct module *owner; + const char *name; + ssize_t (*write)(struct stm_data *data, + struct stm_output *output, unsigned int chan, + const char *buf, size_t count); + void (*policy_node_init)(void *arg); + int (*output_open)(void *priv, struct stm_output *output); + void (*output_close)(struct stm_output *output); + ssize_t priv_sz; + struct configfs_attribute **policy_attr; +}; + +int stm_register_protocol(const struct stm_protocol_driver *pdrv); +void stm_unregister_protocol(const struct stm_protocol_driver *pdrv); +int stm_lookup_protocol(const char *name, + const struct stm_protocol_driver **pdrv, + const struct config_item_type **type); +void stm_put_protocol(const struct stm_protocol_driver *pdrv); +ssize_t stm_data_write(struct stm_data *data, unsigned int m, + unsigned int c, bool ts_first, const void *buf, + size_t count); + #endif /* _STM_STM_H_ */ diff --git a/drivers/misc/ad525x_dpot-i2c.c b/drivers/misc/ad525x_dpot-i2c.c @@ -114,6 +114,6 @@ static struct i2c_driver ad_dpot_i2c_driver = { module_i2c_driver(ad_dpot_i2c_driver); -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("digital potentiometer I2C bus driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/misc/ad525x_dpot-spi.c b/drivers/misc/ad525x_dpot-spi.c @@ -140,7 +140,7 @@ static struct spi_driver ad_dpot_spi_driver = { module_spi_driver(ad_dpot_spi_driver); -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("digital potentiometer SPI bus driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("spi:ad_dpot"); diff --git a/drivers/misc/ad525x_dpot.c b/drivers/misc/ad525x_dpot.c @@ -1,7 +1,7 @@ /* * ad525x_dpot: Driver for the Analog Devices digital potentiometers * Copyright (c) 2009-2010 Analog Devices, Inc. - * Author: Michael Hennerich <hennerich@blackfin.uclinux.org> + * Author: Michael Hennerich <michael.hennerich@analog.com> * * DEVID #Wipers #Positions Resistor Options (kOhm) * AD5258 1 64 1, 10, 50, 100 @@ -64,7 +64,7 @@ * Author: Chris Verges <chrisv@cyberswitching.com> * * derived from ad5252.c - * Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org> + * Copyright (c) 2006-2011 Michael Hennerich <michael.hennerich@analog.com> * * Licensed under the GPL-2 or later. */ @@ -760,6 +760,6 @@ EXPORT_SYMBOL(ad_dpot_remove); MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, " - "Michael Hennerich <hennerich@blackfin.uclinux.org>"); + "Michael Hennerich <michael.hennerich@analog.com>"); MODULE_DESCRIPTION("Digital potentiometer driver"); MODULE_LICENSE("GPL"); diff --git a/drivers/misc/apds990x.c b/drivers/misc/apds990x.c @@ -188,7 +188,6 @@ struct apds990x_chip { #define APDS_LUX_DEFAULT_RATE 200 static const u8 again[] = {1, 8, 16, 120}; /* ALS gain steps */ -static const u8 ir_currents[] = {100, 50, 25, 12}; /* IRled currents in mA */ /* Following two tables must match i.e 10Hz rate means 1 as persistence value */ static const u16 arates_hz[] = {10, 5, 2, 1}; diff --git a/drivers/misc/bh1770glc.c b/drivers/misc/bh1770glc.c @@ -180,9 +180,6 @@ static const char reg_vleds[] = "Vleds"; static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2}; static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500}; -/* Supported IR-led currents in mA */ -static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200}; - /* * Supported stand alone rates in ms from chip data sheet * {100, 200, 500, 1000, 2000}; diff --git a/drivers/misc/cxl/flash.c b/drivers/misc/cxl/flash.c @@ -92,8 +92,8 @@ static int update_property(struct device_node *dn, const char *name, val = (u32 *)new_prop->value; rc = cxl_update_properties(dn, new_prop); - pr_devel("%s: update property (%s, length: %i, value: %#x)\n", - dn->name, name, vd, be32_to_cpu(*val)); + pr_devel("%pOFn: update property (%s, length: %i, value: %#x)\n", + dn, name, vd, be32_to_cpu(*val)); if (rc) { kfree(new_prop->name); diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c @@ -1018,8 +1018,6 @@ err1: void cxl_guest_remove_afu(struct cxl_afu *afu) { - pr_devel("in %s - AFU(%d)\n", __func__, afu->slice); - if (!afu) return; diff --git a/drivers/misc/echo/echo.c b/drivers/misc/echo/echo.c @@ -381,7 +381,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx) */ ec->factor = 0; ec->shift = 0; - if ((ec->nonupdate_dwell == 0)) { + if (!ec->nonupdate_dwell) { int p, logp, shift; /* Determine: diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig @@ -111,4 +111,15 @@ config EEPROM_IDT_89HPESX This driver can also be built as a module. If so, the module will be called idt_89hpesx. +config EEPROM_EE1004 + tristate "SPD EEPROMs on DDR4 memory modules" + depends on I2C && SYSFS + help + Enable this driver to get read support to SPD EEPROMs following + the JEDEC EE1004 standard. These are typically found on DDR4 + SDRAM memory modules. + + This driver can also be built as a module. If so, the module + will be called ee1004. + endmenu diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o obj-$(CONFIG_EEPROM_93XX46) += eeprom_93xx46.o obj-$(CONFIG_EEPROM_DIGSY_MTC_CFG) += digsy_mtc_eeprom.o obj-$(CONFIG_EEPROM_IDT_89HPESX) += idt_89hpesx.o +obj-$(CONFIG_EEPROM_EE1004) += ee1004.o diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c @@ -366,7 +366,7 @@ static int at25_probe(struct spi_device *spi) at25->nvmem_config.word_size = 1; at25->nvmem_config.size = chip.byte_len; - at25->nvmem = nvmem_register(&at25->nvmem_config); + at25->nvmem = devm_nvmem_register(&spi->dev, &at25->nvmem_config); if (IS_ERR(at25->nvmem)) return PTR_ERR(at25->nvmem); @@ -379,16 +379,6 @@ static int at25_probe(struct spi_device *spi) return 0; } -static int at25_remove(struct spi_device *spi) -{ - struct at25_data *at25; - - at25 = spi_get_drvdata(spi); - nvmem_unregister(at25->nvmem); - - return 0; -} - /*-------------------------------------------------------------------------*/ static const struct of_device_id at25_of_match[] = { @@ -403,7 +393,6 @@ static struct spi_driver at25_driver = { .of_match_table = at25_of_match, }, .probe = at25_probe, - .remove = at25_remove, }; module_spi_driver(at25_driver); diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c @@ -0,0 +1,281 @@ +/* + * ee1004 - driver for DDR4 SPD EEPROMs + * + * Copyright (C) 2017 Jean Delvare + * + * Based on the at24 driver: + * Copyright (C) 2005-2007 David Brownell + * Copyright (C) 2008 Wolfram Sang, Pengutronix + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/mutex.h> + +/* + * DDR4 memory modules use special EEPROMs following the Jedec EE1004 + * specification. These are 512-byte EEPROMs using a single I2C address + * in the 0x50-0x57 range for data. One of two 256-byte page is selected + * by writing a command to I2C address 0x36 or 0x37 on the same I2C bus. + * + * Therefore we need to request these 2 additional addresses, and serialize + * access to all such EEPROMs with a single mutex. + * + * We assume it is safe to read up to 32 bytes at once from these EEPROMs. + * We use SMBus access even if I2C is available, these EEPROMs are small + * enough, and reading from them infrequent enough, that we favor simplicity + * over performance. + */ + +#define EE1004_ADDR_SET_PAGE 0x36 +#define EE1004_EEPROM_SIZE 512 +#define EE1004_PAGE_SIZE 256 +#define EE1004_PAGE_SHIFT 8 + +/* + * Mutex protects ee1004_set_page and ee1004_dev_count, and must be held + * from page selection to end of read. + */ +static DEFINE_MUTEX(ee1004_bus_lock); +static struct i2c_client *ee1004_set_page[2]; +static unsigned int ee1004_dev_count; +static int ee1004_current_page; + +static const struct i2c_device_id ee1004_ids[] = { + { "ee1004", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ee1004_ids); + +/*-------------------------------------------------------------------------*/ + +static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf, + unsigned int offset, size_t count) +{ + int status; + + if (count > I2C_SMBUS_BLOCK_MAX) + count = I2C_SMBUS_BLOCK_MAX; + /* Can't cross page boundaries */ + if (unlikely(offset + count > EE1004_PAGE_SIZE)) + count = EE1004_PAGE_SIZE - offset; + + status = i2c_smbus_read_i2c_block_data_or_emulated(client, offset, + count, buf); + dev_dbg(&client->dev, "read %zu@%d --> %d\n", count, offset, status); + + return status; +} + +static ssize_t ee1004_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct device *dev = kobj_to_dev(kobj); + struct i2c_client *client = to_i2c_client(dev); + size_t requested = count; + int page; + + if (unlikely(!count)) + return count; + + page = off >> EE1004_PAGE_SHIFT; + if (unlikely(page > 1)) + return 0; + off &= (1 << EE1004_PAGE_SHIFT) - 1; + + /* + * Read data from chip, protecting against concurrent access to + * other EE1004 SPD EEPROMs on the same adapter. + */ + mutex_lock(&ee1004_bus_lock); + + while (count) { + int status; + + /* Select page */ + if (page != ee1004_current_page) { + /* Data is ignored */ + status = i2c_smbus_write_byte(ee1004_set_page[page], + 0x00); + if (status < 0) { + dev_err(dev, "Failed to select page %d (%d)\n", + page, status); + mutex_unlock(&ee1004_bus_lock); + return status; + } + dev_dbg(dev, "Selected page %d\n", page); + ee1004_current_page = page; + } + + status = ee1004_eeprom_read(client, buf, off, count); + if (status < 0) { + mutex_unlock(&ee1004_bus_lock); + return status; + } + buf += status; + off += status; + count -= status; + + if (off == EE1004_PAGE_SIZE) { + page++; + off = 0; + } + } + + mutex_unlock(&ee1004_bus_lock); + + return requested; +} + +static const struct bin_attribute eeprom_attr = { + .attr = { + .name = "eeprom", + .mode = 0444, + }, + .size = EE1004_EEPROM_SIZE, + .read = ee1004_read, +}; + +static int ee1004_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int err, cnr = 0; + const char *slow = NULL; + + /* Make sure we can operate on this adapter */ + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE | + I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { + if (i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE | + I2C_FUNC_SMBUS_READ_WORD_DATA)) + slow = "word"; + else if (i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_BYTE | + I2C_FUNC_SMBUS_READ_BYTE_DATA)) + slow = "byte"; + else + return -EPFNOSUPPORT; + } + + /* Use 2 dummy devices for page select command */ + mutex_lock(&ee1004_bus_lock); + if (++ee1004_dev_count == 1) { + for (cnr = 0; cnr < 2; cnr++) { + ee1004_set_page[cnr] = i2c_new_dummy(client->adapter, + EE1004_ADDR_SET_PAGE + cnr); + if (!ee1004_set_page[cnr]) { + dev_err(&client->dev, + "address 0x%02x unavailable\n", + EE1004_ADDR_SET_PAGE + cnr); + err = -EADDRINUSE; + goto err_clients; + } + } + } else if (i2c_adapter_id(client->adapter) != + i2c_adapter_id(ee1004_set_page[0]->adapter)) { + dev_err(&client->dev, + "Driver only supports devices on a single I2C bus\n"); + err = -EOPNOTSUPP; + goto err_clients; + } + + /* Remember current page to avoid unneeded page select */ + err = i2c_smbus_read_byte(ee1004_set_page[0]); + if (err == -ENXIO) { + /* Nack means page 1 is selected */ + ee1004_current_page = 1; + } else if (err < 0) { + /* Anything else is a real error, bail out */ + goto err_clients; + } else { + /* Ack means page 0 is selected, returned value meaningless */ + ee1004_current_page = 0; + } + dev_dbg(&client->dev, "Currently selected page: %d\n", + ee1004_current_page); + mutex_unlock(&ee1004_bus_lock); + + /* Create the sysfs eeprom file */ + err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr); + if (err) + goto err_clients_lock; + + dev_info(&client->dev, + "%u byte EE1004-compliant SPD EEPROM, read-only\n", + EE1004_EEPROM_SIZE); + if (slow) + dev_notice(&client->dev, + "Falling back to %s reads, performance will suffer\n", + slow); + + return 0; + + err_clients_lock: + mutex_lock(&ee1004_bus_lock); + err_clients: + if (--ee1004_dev_count == 0) { + for (cnr--; cnr >= 0; cnr--) { + i2c_unregister_device(ee1004_set_page[cnr]); + ee1004_set_page[cnr] = NULL; + } + } + mutex_unlock(&ee1004_bus_lock); + + return err; +} + +static int ee1004_remove(struct i2c_client *client) +{ + int i; + + sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr); + + /* Remove page select clients if this is the last device */ + mutex_lock(&ee1004_bus_lock); + if (--ee1004_dev_count == 0) { + for (i = 0; i < 2; i++) { + i2c_unregister_device(ee1004_set_page[i]); + ee1004_set_page[i] = NULL; + } + } + mutex_unlock(&ee1004_bus_lock); + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static struct i2c_driver ee1004_driver = { + .driver = { + .name = "ee1004", + }, + .probe = ee1004_probe, + .remove = ee1004_remove, + .id_table = ee1004_ids, +}; + +static int __init ee1004_init(void) +{ + return i2c_add_driver(&ee1004_driver); +} +module_init(ee1004_init); + +static void __exit ee1004_exit(void) +{ + i2c_del_driver(&ee1004_driver); +} +module_exit(ee1004_exit); + +MODULE_DESCRIPTION("Driver for EE1004-compliant DDR4 SPD EEPROMs"); +MODULE_AUTHOR("Jean Delvare"); +MODULE_LICENSE("GPL"); diff --git a/drivers/misc/eeprom/eeprom_93xx46.c b/drivers/misc/eeprom/eeprom_93xx46.c @@ -439,7 +439,7 @@ static int eeprom_93xx46_probe(struct spi_device *spi) return -ENODEV; } - edev = kzalloc(sizeof(*edev), GFP_KERNEL); + edev = devm_kzalloc(&spi->dev, sizeof(*edev), GFP_KERNEL); if (!edev) return -ENOMEM; @@ -449,8 +449,7 @@ static int eeprom_93xx46_probe(struct spi_device *spi) edev->addrlen = 6; else { dev_err(&spi->dev, "unspecified address type\n"); - err = -EINVAL; - goto fail; + return -EINVAL; } mutex_init(&edev->lock); @@ -473,11 +472,9 @@ static int eeprom_93xx46_probe(struct spi_device *spi) edev->nvmem_config.word_size = 1; edev->nvmem_config.size = edev->size; - edev->nvmem = nvmem_register(&edev->nvmem_config); - if (IS_ERR(edev->nvmem)) { - err = PTR_ERR(edev->nvmem); - goto fail; - } + edev->nvmem = devm_nvmem_register(&spi->dev, &edev->nvmem_config); + if (IS_ERR(edev->nvmem)) + return PTR_ERR(edev->nvmem); dev_info(&spi->dev, "%d-bit eeprom %s\n", (pd->flags & EE_ADDR8) ? 8 : 16, @@ -490,21 +487,15 @@ static int eeprom_93xx46_probe(struct spi_device *spi) spi_set_drvdata(spi, edev); return 0; -fail: - kfree(edev); - return err; } static int eeprom_93xx46_remove(struct spi_device *spi) { struct eeprom_93xx46_dev *edev = spi_get_drvdata(spi); - nvmem_unregister(edev->nvmem); - if (!(edev->pdata->flags & EE_READONLY)) device_remove_file(&spi->dev, &dev_attr_erase); - kfree(edev); return 0; } diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c @@ -24,7 +24,6 @@ * controlled from here. */ -#include <linux/module.h> #include <linux/types.h> #include <linux/pci.h> #include <linux/err.h> diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c @@ -27,7 +27,6 @@ */ #include <linux/types.h> -#include <linux/module.h> #include <linux/sched.h> #include <linux/wait.h> #include <linux/pci.h> diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c @@ -23,14 +23,12 @@ */ #include <linux/kernel.h> -#include <linux/dma-mapping.h> #include <linux/sched.h> #include <linux/vmalloc.h> #include <linux/page-flags.h> #include <linux/scatterlist.h> #include <linux/hugetlb.h> #include <linux/iommu.h> -#include <linux/delay.h> #include <linux/pci.h> #include <linux/dma-mapping.h> #include <linux/ctype.h> @@ -298,7 +296,7 @@ static int genwqe_sgl_size(int num_pages) int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, void __user *user_addr, size_t user_size, int write) { - int rc; + int ret = -ENOMEM; struct pci_dev *pci_dev = cd->pci_dev; sgl->fpage_offs = offset_in_page((unsigned long)user_addr); @@ -318,7 +316,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, if (get_order(sgl->sgl_size) > MAX_ORDER) { dev_err(&pci_dev->dev, "[%s] err: too much memory requested!\n", __func__); - return -ENOMEM; + return ret; } sgl->sgl = __genwqe_alloc_consistent(cd, sgl->sgl_size, @@ -326,7 +324,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, if (sgl->sgl == NULL) { dev_err(&pci_dev->dev, "[%s] err: no memory available!\n", __func__); - return -ENOMEM; + return ret; } /* Only use buffering on incomplete pages */ @@ -339,7 +337,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, /* Sync with user memory */ if (copy_from_user(sgl->fpage + sgl->fpage_offs, user_addr, sgl->fpage_size)) { - rc = -EFAULT; + ret = -EFAULT; goto err_out; } } @@ -352,7 +350,7 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, /* Sync with user memory */ if (copy_from_user(sgl->lpage, user_addr + user_size - sgl->lpage_size, sgl->lpage_size)) { - rc = -EFAULT; + ret = -EFAULT; goto err_out2; } } @@ -374,7 +372,8 @@ int genwqe_alloc_sync_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, sgl->sgl = NULL; sgl->sgl_dma_addr = 0; sgl->sgl_size = 0; - return -ENOMEM; + + return ret; } int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c @@ -985,6 +985,12 @@ static void kgdbts_run_tests(void) int nmi_sleep = 0; int i; + verbose = 0; + if (strstr(config, "V1")) + verbose = 1; + if (strstr(config, "V2")) + verbose = 2; + ptr = strchr(config, 'F'); if (ptr) fork_test = simple_strtol(ptr + 1, NULL, 10); @@ -1068,13 +1074,6 @@ static int kgdbts_option_setup(char *opt) return -ENOSPC; } strcpy(config, opt); - - verbose = 0; - if (strstr(config, "V1")) - verbose = 1; - if (strstr(config, "V2")) - verbose = 2; - return 0; } @@ -1086,9 +1085,6 @@ static int configure_kgdbts(void) if (!strlen(config) || isspace(config[0])) goto noconfig; - err = kgdbts_option_setup(config); - if (err) - goto noconfig; final_ack = 0; run_plant_and_detach_test(1); diff --git a/drivers/misc/lkdtm/usercopy.c b/drivers/misc/lkdtm/usercopy.c @@ -18,7 +18,7 @@ * hardened usercopy checks by added "unconst" to all the const copies, * and making sure "cache_size" isn't optimized into a const. */ -static volatile size_t unconst = 0; +static volatile size_t unconst; static volatile size_t cache_size = 1024; static struct kmem_cache *whitelist_cache; diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c @@ -17,7 +17,6 @@ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/module.h> -#include <linux/moduleparam.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/uuid.h> diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c @@ -599,10 +599,10 @@ static __poll_t mei_poll(struct file *file, poll_table *wait) mei_cl_read_start(cl, mei_cl_mtu(cl), file); } - if (req_events & (POLLOUT | POLLWRNORM)) { + if (req_events & (EPOLLOUT | EPOLLWRNORM)) { poll_wait(file, &cl->tx_wait, wait); if (cl->tx_cb_queued < dev->tx_queue_limit) - mask |= POLLOUT | POLLWRNORM; + mask |= EPOLLOUT | EPOLLWRNORM; } out: diff --git a/drivers/misc/mic/scif/scif_dma.c b/drivers/misc/mic/scif/scif_dma.c @@ -1035,8 +1035,6 @@ scif_rma_list_dma_copy_unaligned(struct scif_copy_work *work, } dma_async_issue_pending(chan); } - if (ret < 0) - goto err; offset += loop_len; temp += loop_len; temp_phys += loop_len; @@ -1553,9 +1551,8 @@ static int scif_rma_list_dma_copy_wrapper(struct scif_endpt *epd, int src_cache_off, dst_cache_off; s64 src_offset = work->src_offset, dst_offset = work->dst_offset; u8 *temp = NULL; - bool src_local = true, dst_local = false; + bool src_local = true; struct scif_dma_comp_cb *comp_cb; - dma_addr_t src_dma_addr, dst_dma_addr; int err; if (is_dma_copy_aligned(chan->device, 1, 1, 1)) @@ -1569,12 +1566,8 @@ static int scif_rma_list_dma_copy_wrapper(struct scif_endpt *epd, if (work->loopback) return scif_rma_list_cpu_copy(work); - src_dma_addr = __scif_off_to_dma_addr(work->src_window, src_offset); - dst_dma_addr = __scif_off_to_dma_addr(work->dst_window, dst_offset); src_local = work->src_window->type == SCIF_WINDOW_SELF; - dst_local = work->dst_window->type == SCIF_WINDOW_SELF; - dst_local = dst_local; /* Allocate dma_completion cb */ comp_cb = kzalloc(sizeof(*comp_cb), GFP_KERNEL); if (!comp_cb) diff --git a/drivers/misc/mic/scif/scif_fence.c b/drivers/misc/mic/scif/scif_fence.c @@ -272,7 +272,7 @@ static int _scif_prog_signal(scif_epd_t epd, dma_addr_t dst, u64 val) dma_fail: if (!x100) dma_pool_free(ep->remote_dev->signal_pool, status, - status->src_dma_addr); + src - offsetof(struct scif_status, val)); alloc_fail: return err; } diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c @@ -634,7 +634,7 @@ static int send_noop_message(void *cb, struct gru_message_queue_desc *mqd, break; case CBSS_PAGE_OVERFLOW: STAT(mesq_noop_page_overflow); - /* fallthru */ + /* fall through */ default: BUG(); } @@ -792,7 +792,7 @@ static int send_message_failure(void *cb, struct gru_message_queue_desc *mqd, break; case CBSS_PAGE_OVERFLOW: STAT(mesq_page_overflow); - /* fallthru */ + /* fall through */ default: BUG(); } diff --git a/drivers/misc/sgi-xp/xpc_channel.c b/drivers/misc/sgi-xp/xpc_channel.c @@ -28,7 +28,7 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags) { enum xp_retval ret; - DBUG_ON(!spin_is_locked(&ch->lock)); + lockdep_assert_held(&ch->lock); if (!(ch->flags & XPC_C_OPENREQUEST) || !(ch->flags & XPC_C_ROPENREQUEST)) { @@ -82,7 +82,7 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags) struct xpc_partition *part = &xpc_partitions[ch->partid]; u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED); - DBUG_ON(!spin_is_locked(&ch->lock)); + lockdep_assert_held(&ch->lock); if (!(ch->flags & XPC_C_DISCONNECTING)) return; @@ -755,7 +755,7 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch, { u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED); - DBUG_ON(!spin_is_locked(&ch->lock)); + lockdep_assert_held(&ch->lock); if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) return; diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c @@ -98,8 +98,7 @@ xpc_get_rsvd_page_pa(int nasid) len = L1_CACHE_ALIGN(len); if (len > buf_len) { - if (buf_base != NULL) - kfree(buf_base); + kfree(buf_base); buf_len = L1_CACHE_ALIGN(len); buf = xpc_kmalloc_cacheline_aligned(buf_len, GFP_KERNEL, &buf_base); diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c @@ -1671,7 +1671,7 @@ xpc_teardown_msg_structures_sn2(struct xpc_channel *ch) { struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2; - DBUG_ON(!spin_is_locked(&ch->lock)); + lockdep_assert_held(&ch->lock); ch_sn2->remote_msgqueue_pa = 0; diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c @@ -1183,7 +1183,7 @@ xpc_teardown_msg_structures_uv(struct xpc_channel *ch) { struct xpc_channel_uv *ch_uv = &ch->sn.uv; - DBUG_ON(!spin_is_locked(&ch->lock)); + lockdep_assert_held(&ch->lock); kfree(ch_uv->cached_notify_gru_mq_desc); ch_uv->cached_notify_gru_mq_desc = NULL; diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c @@ -323,10 +323,8 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res) cur_start = block->start + block->size; } - err_chunks: - if (child) - of_node_put(child); - +err_chunks: + of_node_put(child); kfree(rblocks); return ret; diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c @@ -25,6 +25,9 @@ #include <linux/workqueue.h> #include <linux/debugfs.h> #include <linux/seq_file.h> +#include <linux/rwsem.h> +#include <linux/slab.h> +#include <linux/spinlock.h> #include <linux/vmw_vmci_defs.h> #include <linux/vmw_vmci_api.h> #include <asm/hypervisor.h> @@ -37,20 +40,20 @@ MODULE_ALIAS("vmware_vmmemctl"); MODULE_LICENSE("GPL"); /* - * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't - * allow wait (__GFP_RECLAIM) for NOSLEEP page allocations. Use - * __GFP_NOWARN, to suppress page allocation failure warnings. + * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't allow wait + * (__GFP_RECLAIM) for huge page allocations. Use __GFP_NOWARN, to suppress page + * allocation failure warnings. Disallow access to emergency low-memory pools. */ -#define VMW_PAGE_ALLOC_NOSLEEP (__GFP_HIGHMEM|__GFP_NOWARN) +#define VMW_HUGE_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \ + __GFP_NOMEMALLOC) /* - * Use GFP_HIGHUSER when executing in a separate kernel thread - * context and allocation can sleep. This is less stressful to - * the guest memory system, since it allows the thread to block - * while memory is reclaimed, and won't take pages from emergency - * low-memory pools. + * Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We allow lightweight + * reclamation (__GFP_NORETRY). Use __GFP_NOWARN, to suppress page allocation + * failure warnings. Disallow access to emergency low-memory pools. */ -#define VMW_PAGE_ALLOC_CANSLEEP (GFP_HIGHUSER) +#define VMW_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \ + __GFP_NOMEMALLOC|__GFP_NORETRY) /* Maximum number of refused pages we accumulate during inflation cycle */ #define VMW_BALLOON_MAX_REFUSED 16 @@ -77,225 +80,420 @@ enum vmwballoon_capabilities { | VMW_BALLOON_BATCHED_2M_CMDS \ | VMW_BALLOON_SIGNALLED_WAKEUP_CMD) -#define VMW_BALLOON_2M_SHIFT (9) -#define VMW_BALLOON_NUM_PAGE_SIZES (2) +#define VMW_BALLOON_2M_ORDER (PMD_SHIFT - PAGE_SHIFT) -/* - * Backdoor commands availability: - * - * START, GET_TARGET and GUEST_ID are always available, - * - * VMW_BALLOON_BASIC_CMDS: - * LOCK and UNLOCK commands, - * VMW_BALLOON_BATCHED_CMDS: - * BATCHED_LOCK and BATCHED_UNLOCK commands. - * VMW BALLOON_BATCHED_2M_CMDS: - * BATCHED_2M_LOCK and BATCHED_2M_UNLOCK commands, - * VMW VMW_BALLOON_SIGNALLED_WAKEUP_CMD: - * VMW_BALLOON_CMD_VMCI_DOORBELL_SET command. - */ -#define VMW_BALLOON_CMD_START 0 -#define VMW_BALLOON_CMD_GET_TARGET 1 -#define VMW_BALLOON_CMD_LOCK 2 -#define VMW_BALLOON_CMD_UNLOCK 3 -#define VMW_BALLOON_CMD_GUEST_ID 4 -#define VMW_BALLOON_CMD_BATCHED_LOCK 6 -#define VMW_BALLOON_CMD_BATCHED_UNLOCK 7 -#define VMW_BALLOON_CMD_BATCHED_2M_LOCK 8 -#define VMW_BALLOON_CMD_BATCHED_2M_UNLOCK 9 -#define VMW_BALLOON_CMD_VMCI_DOORBELL_SET 10 - - -/* error codes */ -#define VMW_BALLOON_SUCCESS 0 -#define VMW_BALLOON_FAILURE -1 -#define VMW_BALLOON_ERROR_CMD_INVALID 1 -#define VMW_BALLOON_ERROR_PPN_INVALID 2 -#define VMW_BALLOON_ERROR_PPN_LOCKED 3 -#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4 -#define VMW_BALLOON_ERROR_PPN_PINNED 5 -#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6 -#define VMW_BALLOON_ERROR_RESET 7 -#define VMW_BALLOON_ERROR_BUSY 8 +enum vmballoon_page_size_type { + VMW_BALLOON_4K_PAGE, + VMW_BALLOON_2M_PAGE, + VMW_BALLOON_LAST_SIZE = VMW_BALLOON_2M_PAGE +}; -#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000) +#define VMW_BALLOON_NUM_PAGE_SIZES (VMW_BALLOON_LAST_SIZE + 1) -/* Batch page description */ +static const char * const vmballoon_page_size_names[] = { + [VMW_BALLOON_4K_PAGE] = "4k", + [VMW_BALLOON_2M_PAGE] = "2M" +}; -/* - * Layout of a page in the batch page: +enum vmballoon_op { + VMW_BALLOON_INFLATE, + VMW_BALLOON_DEFLATE +}; + +enum vmballoon_op_stat_type { + VMW_BALLOON_OP_STAT, + VMW_BALLOON_OP_FAIL_STAT +}; + +#define VMW_BALLOON_OP_STAT_TYPES (VMW_BALLOON_OP_FAIL_STAT + 1) + +/** + * enum vmballoon_cmd_type - backdoor commands. * - * +-------------+----------+--------+ - * | | | | - * | Page number | Reserved | Status | - * | | | | - * +-------------+----------+--------+ - * 64 PAGE_SHIFT 6 0 + * Availability of the commands is as followed: * - * The reserved field should be set to 0. + * %VMW_BALLOON_CMD_START, %VMW_BALLOON_CMD_GET_TARGET and + * %VMW_BALLOON_CMD_GUEST_ID are always available. + * + * If the host reports %VMW_BALLOON_BASIC_CMDS are supported then + * %VMW_BALLOON_CMD_LOCK and %VMW_BALLOON_CMD_UNLOCK commands are available. + * + * If the host reports %VMW_BALLOON_BATCHED_CMDS are supported then + * %VMW_BALLOON_CMD_BATCHED_LOCK and VMW_BALLOON_CMD_BATCHED_UNLOCK commands + * are available. + * + * If the host reports %VMW_BALLOON_BATCHED_2M_CMDS are supported then + * %VMW_BALLOON_CMD_BATCHED_2M_LOCK and %VMW_BALLOON_CMD_BATCHED_2M_UNLOCK + * are supported. + * + * If the host reports VMW_BALLOON_SIGNALLED_WAKEUP_CMD is supported then + * VMW_BALLOON_CMD_VMCI_DOORBELL_SET command is supported. + * + * @VMW_BALLOON_CMD_START: Communicating supported version with the hypervisor. + * @VMW_BALLOON_CMD_GET_TARGET: Gets the balloon target size. + * @VMW_BALLOON_CMD_LOCK: Informs the hypervisor about a ballooned page. + * @VMW_BALLOON_CMD_UNLOCK: Informs the hypervisor about a page that is about + * to be deflated from the balloon. + * @VMW_BALLOON_CMD_GUEST_ID: Informs the hypervisor about the type of OS that + * runs in the VM. + * @VMW_BALLOON_CMD_BATCHED_LOCK: Inform the hypervisor about a batch of + * ballooned pages (up to 512). + * @VMW_BALLOON_CMD_BATCHED_UNLOCK: Inform the hypervisor about a batch of + * pages that are about to be deflated from the + * balloon (up to 512). + * @VMW_BALLOON_CMD_BATCHED_2M_LOCK: Similar to @VMW_BALLOON_CMD_BATCHED_LOCK + * for 2MB pages. + * @VMW_BALLOON_CMD_BATCHED_2M_UNLOCK: Similar to + * @VMW_BALLOON_CMD_BATCHED_UNLOCK for 2MB + * pages. + * @VMW_BALLOON_CMD_VMCI_DOORBELL_SET: A command to set doorbell notification + * that would be invoked when the balloon + * size changes. + * @VMW_BALLOON_CMD_LAST: Value of the last command. */ -#define VMW_BALLOON_BATCH_MAX_PAGES (PAGE_SIZE / sizeof(u64)) -#define VMW_BALLOON_BATCH_STATUS_MASK ((1UL << 5) - 1) -#define VMW_BALLOON_BATCH_PAGE_MASK (~((1UL << PAGE_SHIFT) - 1)) - -struct vmballoon_batch_page { - u64 pages[VMW_BALLOON_BATCH_MAX_PAGES]; +enum vmballoon_cmd_type { + VMW_BALLOON_CMD_START, + VMW_BALLOON_CMD_GET_TARGET, + VMW_BALLOON_CMD_LOCK, + VMW_BALLOON_CMD_UNLOCK, + VMW_BALLOON_CMD_GUEST_ID, + /* No command 5 */ + VMW_BALLOON_CMD_BATCHED_LOCK = 6, + VMW_BALLOON_CMD_BATCHED_UNLOCK, + VMW_BALLOON_CMD_BATCHED_2M_LOCK, + VMW_BALLOON_CMD_BATCHED_2M_UNLOCK, + VMW_BALLOON_CMD_VMCI_DOORBELL_SET, + VMW_BALLOON_CMD_LAST = VMW_BALLOON_CMD_VMCI_DOORBELL_SET, }; -static u64 vmballoon_batch_get_pa(struct vmballoon_batch_page *batch, int idx) -{ - return batch->pages[idx] & VMW_BALLOON_BATCH_PAGE_MASK; -} +#define VMW_BALLOON_CMD_NUM (VMW_BALLOON_CMD_LAST + 1) + +enum vmballoon_error_codes { + VMW_BALLOON_SUCCESS, + VMW_BALLOON_ERROR_CMD_INVALID, + VMW_BALLOON_ERROR_PPN_INVALID, + VMW_BALLOON_ERROR_PPN_LOCKED, + VMW_BALLOON_ERROR_PPN_UNLOCKED, + VMW_BALLOON_ERROR_PPN_PINNED, + VMW_BALLOON_ERROR_PPN_NOTNEEDED, + VMW_BALLOON_ERROR_RESET, + VMW_BALLOON_ERROR_BUSY +}; -static int vmballoon_batch_get_status(struct vmballoon_batch_page *batch, - int idx) -{ - return (int)(batch->pages[idx] & VMW_BALLOON_BATCH_STATUS_MASK); -} +#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000) -static void vmballoon_batch_set_pa(struct vmballoon_batch_page *batch, int idx, - u64 pa) -{ - batch->pages[idx] = pa; -} +#define VMW_BALLOON_CMD_WITH_TARGET_MASK \ + ((1UL << VMW_BALLOON_CMD_GET_TARGET) | \ + (1UL << VMW_BALLOON_CMD_LOCK) | \ + (1UL << VMW_BALLOON_CMD_UNLOCK) | \ + (1UL << VMW_BALLOON_CMD_BATCHED_LOCK) | \ + (1UL << VMW_BALLOON_CMD_BATCHED_UNLOCK) | \ + (1UL << VMW_BALLOON_CMD_BATCHED_2M_LOCK) | \ + (1UL << VMW_BALLOON_CMD_BATCHED_2M_UNLOCK)) + +static const char * const vmballoon_cmd_names[] = { + [VMW_BALLOON_CMD_START] = "start", + [VMW_BALLOON_CMD_GET_TARGET] = "target", + [VMW_BALLOON_CMD_LOCK] = "lock", + [VMW_BALLOON_CMD_UNLOCK] = "unlock", + [VMW_BALLOON_CMD_GUEST_ID] = "guestType", + [VMW_BALLOON_CMD_BATCHED_LOCK] = "batchLock", + [VMW_BALLOON_CMD_BATCHED_UNLOCK] = "batchUnlock", + [VMW_BALLOON_CMD_BATCHED_2M_LOCK] = "2m-lock", + [VMW_BALLOON_CMD_BATCHED_2M_UNLOCK] = "2m-unlock", + [VMW_BALLOON_CMD_VMCI_DOORBELL_SET] = "doorbellSet" +}; +enum vmballoon_stat_page { + VMW_BALLOON_PAGE_STAT_ALLOC, + VMW_BALLOON_PAGE_STAT_ALLOC_FAIL, + VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC, + VMW_BALLOON_PAGE_STAT_REFUSED_FREE, + VMW_BALLOON_PAGE_STAT_FREE, + VMW_BALLOON_PAGE_STAT_LAST = VMW_BALLOON_PAGE_STAT_FREE +}; -#define VMWARE_BALLOON_CMD(cmd, arg1, arg2, result) \ -({ \ - unsigned long __status, __dummy1, __dummy2, __dummy3; \ - __asm__ __volatile__ ("inl %%dx" : \ - "=a"(__status), \ - "=c"(__dummy1), \ - "=d"(__dummy2), \ - "=b"(result), \ - "=S" (__dummy3) : \ - "0"(VMW_BALLOON_HV_MAGIC), \ - "1"(VMW_BALLOON_CMD_##cmd), \ - "2"(VMW_BALLOON_HV_PORT), \ - "3"(arg1), \ - "4" (arg2) : \ - "memory"); \ - if (VMW_BALLOON_CMD_##cmd == VMW_BALLOON_CMD_START) \ - result = __dummy1; \ - result &= -1UL; \ - __status & -1UL; \ -}) +#define VMW_BALLOON_PAGE_STAT_NUM (VMW_BALLOON_PAGE_STAT_LAST + 1) -#ifdef CONFIG_DEBUG_FS -struct vmballoon_stats { - unsigned int timer; - unsigned int doorbell; - - /* allocation statistics */ - unsigned int alloc[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int alloc_fail[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int sleep_alloc; - unsigned int sleep_alloc_fail; - unsigned int refused_alloc[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int refused_free[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int free[VMW_BALLOON_NUM_PAGE_SIZES]; - - /* monitor operations */ - unsigned int lock[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int lock_fail[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int unlock[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int unlock_fail[VMW_BALLOON_NUM_PAGE_SIZES]; - unsigned int target; - unsigned int target_fail; - unsigned int start; - unsigned int start_fail; - unsigned int guest_type; - unsigned int guest_type_fail; - unsigned int doorbell_set; - unsigned int doorbell_unset; +enum vmballoon_stat_general { + VMW_BALLOON_STAT_TIMER, + VMW_BALLOON_STAT_DOORBELL, + VMW_BALLOON_STAT_RESET, + VMW_BALLOON_STAT_LAST = VMW_BALLOON_STAT_RESET }; -#define STATS_INC(stat) (stat)++ -#else -#define STATS_INC(stat) -#endif +#define VMW_BALLOON_STAT_NUM (VMW_BALLOON_STAT_LAST + 1) -struct vmballoon; -struct vmballoon_ops { - void (*add_page)(struct vmballoon *b, int idx, struct page *p); - int (*lock)(struct vmballoon *b, unsigned int num_pages, - bool is_2m_pages, unsigned int *target); - int (*unlock)(struct vmballoon *b, unsigned int num_pages, - bool is_2m_pages, unsigned int *target); +static DEFINE_STATIC_KEY_TRUE(vmw_balloon_batching); +static DEFINE_STATIC_KEY_FALSE(balloon_stat_enabled); + +struct vmballoon_ctl { + struct list_head pages; + struct list_head refused_pages; + unsigned int n_refused_pages; + unsigned int n_pages; + enum vmballoon_page_size_type page_size; + enum vmballoon_op op; }; struct vmballoon_page_size { /* list of reserved physical pages */ struct list_head pages; - - /* transient list of non-balloonable pages */ - struct list_head refused_pages; - unsigned int n_refused_pages; }; +/** + * struct vmballoon_batch_entry - a batch entry for lock or unlock. + * + * @status: the status of the operation, which is written by the hypervisor. + * @reserved: reserved for future use. Must be set to zero. + * @pfn: the physical frame number of the page to be locked or unlocked. + */ +struct vmballoon_batch_entry { + u64 status : 5; + u64 reserved : PAGE_SHIFT - 5; + u64 pfn : 52; +} __packed; + struct vmballoon { struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES]; - /* supported page sizes. 1 == 4k pages only, 2 == 4k and 2m pages */ - unsigned supported_page_sizes; + /** + * @max_page_size: maximum supported page size for ballooning. + * + * Protected by @conf_sem + */ + enum vmballoon_page_size_type max_page_size; + + /** + * @size: balloon actual size in basic page size (frames). + * + * While we currently do not support size which is bigger than 32-bit, + * in preparation for future support, use 64-bits. + */ + atomic64_t size; - /* balloon size in pages */ - unsigned int size; - unsigned int target; + /** + * @target: balloon target size in basic page size (frames). + * + * We do not protect the target under the assumption that setting the + * value is always done through a single write. If this assumption ever + * breaks, we would have to use X_ONCE for accesses, and suffer the less + * optimized code. Although we may read stale target value if multiple + * accesses happen at once, the performance impact should be minor. + */ + unsigned long target; - /* reset flag */ + /** + * @reset_required: reset flag + * + * Setting this flag may introduce races, but the code is expected to + * handle them gracefully. In the worst case, another operation will + * fail as reset did not take place. Clearing the flag is done while + * holding @conf_sem for write. + */ bool reset_required; + /** + * @capabilities: hypervisor balloon capabilities. + * + * Protected by @conf_sem. + */ unsigned long capabilities; - struct vmballoon_batch_page *batch_page; + /** + * @batch_page: pointer to communication batch page. + * + * When batching is used, batch_page points to a page, which holds up to + * %VMW_BALLOON_BATCH_MAX_PAGES entries for locking or unlocking. + */ + struct vmballoon_batch_entry *batch_page; + + /** + * @batch_max_pages: maximum pages that can be locked/unlocked. + * + * Indicates the number of pages that the hypervisor can lock or unlock + * at once, according to whether batching is enabled. If batching is + * disabled, only a single page can be locked/unlock on each operation. + * + * Protected by @conf_sem. + */ unsigned int batch_max_pages; - struct page *page; - const struct vmballoon_ops *ops; + /** + * @page: page to be locked/unlocked by the hypervisor + * + * @page is only used when batching is disabled and a single page is + * reclaimed on each iteration. + * + * Protected by @comm_lock. + */ + struct page *page; -#ifdef CONFIG_DEBUG_FS /* statistics */ - struct vmballoon_stats stats; + struct vmballoon_stats *stats; +#ifdef CONFIG_DEBUG_FS /* debugfs file exporting statistics */ struct dentry *dbg_entry; #endif - struct sysinfo sysinfo; - struct delayed_work dwork; + /** + * @vmci_doorbell. + * + * Protected by @conf_sem. + */ struct vmci_handle vmci_doorbell; + + /** + * @conf_sem: semaphore to protect the configuration and the statistics. + */ + struct rw_semaphore conf_sem; + + /** + * @comm_lock: lock to protect the communication with the host. + * + * Lock ordering: @conf_sem -> @comm_lock . + */ + spinlock_t comm_lock; }; static struct vmballoon balloon; +struct vmballoon_stats { + /* timer / doorbell operations */ + atomic64_t general_stat[VMW_BALLOON_STAT_NUM]; + + /* allocation statistics for huge and small pages */ + atomic64_t + page_stat[VMW_BALLOON_PAGE_STAT_NUM][VMW_BALLOON_NUM_PAGE_SIZES]; + + /* Monitor operations: total operations, and failures */ + atomic64_t ops[VMW_BALLOON_CMD_NUM][VMW_BALLOON_OP_STAT_TYPES]; +}; + +static inline bool is_vmballoon_stats_on(void) +{ + return IS_ENABLED(CONFIG_DEBUG_FS) && + static_branch_unlikely(&balloon_stat_enabled); +} + +static inline void vmballoon_stats_op_inc(struct vmballoon *b, unsigned int op, + enum vmballoon_op_stat_type type) +{ + if (is_vmballoon_stats_on()) + atomic64_inc(&b->stats->ops[op][type]); +} + +static inline void vmballoon_stats_gen_inc(struct vmballoon *b, + enum vmballoon_stat_general stat) +{ + if (is_vmballoon_stats_on()) + atomic64_inc(&b->stats->general_stat[stat]); +} + +static inline void vmballoon_stats_gen_add(struct vmballoon *b, + enum vmballoon_stat_general stat, + unsigned int val) +{ + if (is_vmballoon_stats_on()) + atomic64_add(val, &b->stats->general_stat[stat]); +} + +static inline void vmballoon_stats_page_inc(struct vmballoon *b, + enum vmballoon_stat_page stat, + enum vmballoon_page_size_type size) +{ + if (is_vmballoon_stats_on()) + atomic64_inc(&b->stats->page_stat[stat][size]); +} + +static inline void vmballoon_stats_page_add(struct vmballoon *b, + enum vmballoon_stat_page stat, + enum vmballoon_page_size_type size, + unsigned int val) +{ + if (is_vmballoon_stats_on()) + atomic64_add(val, &b->stats->page_stat[stat][size]); +} + +static inline unsigned long +__vmballoon_cmd(struct vmballoon *b, unsigned long cmd, unsigned long arg1, + unsigned long arg2, unsigned long *result) +{ + unsigned long status, dummy1, dummy2, dummy3, local_result; + + vmballoon_stats_op_inc(b, cmd, VMW_BALLOON_OP_STAT); + + asm volatile ("inl %%dx" : + "=a"(status), + "=c"(dummy1), + "=d"(dummy2), + "=b"(local_result), + "=S"(dummy3) : + "0"(VMW_BALLOON_HV_MAGIC), + "1"(cmd), + "2"(VMW_BALLOON_HV_PORT), + "3"(arg1), + "4"(arg2) : + "memory"); + + /* update the result if needed */ + if (result) + *result = (cmd == VMW_BALLOON_CMD_START) ? dummy1 : + local_result; + + /* update target when applicable */ + if (status == VMW_BALLOON_SUCCESS && + ((1ul << cmd) & VMW_BALLOON_CMD_WITH_TARGET_MASK)) + WRITE_ONCE(b->target, local_result); + + if (status != VMW_BALLOON_SUCCESS && + status != VMW_BALLOON_SUCCESS_WITH_CAPABILITIES) { + vmballoon_stats_op_inc(b, cmd, VMW_BALLOON_OP_FAIL_STAT); + pr_debug("%s: %s [0x%lx,0x%lx) failed, returned %ld\n", + __func__, vmballoon_cmd_names[cmd], arg1, arg2, + status); + } + + /* mark reset required accordingly */ + if (status == VMW_BALLOON_ERROR_RESET) + b->reset_required = true; + + return status; +} + +static __always_inline unsigned long +vmballoon_cmd(struct vmballoon *b, unsigned long cmd, unsigned long arg1, + unsigned long arg2) +{ + unsigned long dummy; + + return __vmballoon_cmd(b, cmd, arg1, arg2, &dummy); +} + /* * Send "start" command to the host, communicating supported version * of the protocol. */ -static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps) +static int vmballoon_send_start(struct vmballoon *b, unsigned long req_caps) { - unsigned long status, capabilities, dummy = 0; - bool success; - - STATS_INC(b->stats.start); + unsigned long status, capabilities; - status = VMWARE_BALLOON_CMD(START, req_caps, dummy, capabilities); + status = __vmballoon_cmd(b, VMW_BALLOON_CMD_START, req_caps, 0, + &capabilities); switch (status) { case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES: b->capabilities = capabilities; - success = true; break; case VMW_BALLOON_SUCCESS: b->capabilities = VMW_BALLOON_BASIC_CMDS; - success = true; break; default: - success = false; + return -EIO; } /* @@ -303,626 +501,693 @@ static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps) * reason disabled, do not use 2MB pages, since otherwise the legacy * mechanism is used with 2MB pages, causing a failure. */ + b->max_page_size = VMW_BALLOON_4K_PAGE; if ((b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) && (b->capabilities & VMW_BALLOON_BATCHED_CMDS)) - b->supported_page_sizes = 2; - else - b->supported_page_sizes = 1; - - if (!success) { - pr_debug("%s - failed, hv returns %ld\n", __func__, status); - STATS_INC(b->stats.start_fail); - } - return success; -} + b->max_page_size = VMW_BALLOON_2M_PAGE; -static bool vmballoon_check_status(struct vmballoon *b, unsigned long status) -{ - switch (status) { - case VMW_BALLOON_SUCCESS: - return true; - case VMW_BALLOON_ERROR_RESET: - b->reset_required = true; - /* fall through */ - - default: - return false; - } + return 0; } -/* +/** + * vmballoon_send_guest_id - communicate guest type to the host. + * + * @b: pointer to the balloon. + * * Communicate guest type to the host so that it can adjust ballooning * algorithm to the one most appropriate for the guest. This command * is normally issued after sending "start" command and is part of * standard reset sequence. + * + * Return: zero on success or appropriate error code. */ -static bool vmballoon_send_guest_id(struct vmballoon *b) +static int vmballoon_send_guest_id(struct vmballoon *b) { - unsigned long status, dummy = 0; - - status = VMWARE_BALLOON_CMD(GUEST_ID, VMW_BALLOON_GUEST_ID, dummy, - dummy); - - STATS_INC(b->stats.guest_type); + unsigned long status; - if (vmballoon_check_status(b, status)) - return true; + status = vmballoon_cmd(b, VMW_BALLOON_CMD_GUEST_ID, + VMW_BALLOON_GUEST_ID, 0); - pr_debug("%s - failed, hv returns %ld\n", __func__, status); - STATS_INC(b->stats.guest_type_fail); - return false; + return status == VMW_BALLOON_SUCCESS ? 0 : -EIO; } -static u16 vmballoon_page_size(bool is_2m_page) +/** + * vmballoon_page_order() - return the order of the page + * @page_size: the size of the page. + * + * Return: the allocation order. + */ +static inline +unsigned int vmballoon_page_order(enum vmballoon_page_size_type page_size) { - if (is_2m_page) - return 1 << VMW_BALLOON_2M_SHIFT; + return page_size == VMW_BALLOON_2M_PAGE ? VMW_BALLOON_2M_ORDER : 0; +} - return 1; +/** + * vmballoon_page_in_frames() - returns the number of frames in a page. + * @page_size: the size of the page. + * + * Return: the number of 4k frames. + */ +static inline unsigned int +vmballoon_page_in_frames(enum vmballoon_page_size_type page_size) +{ + return 1 << vmballoon_page_order(page_size); } -/* - * Retrieve desired balloon size from the host. +/** + * vmballoon_send_get_target() - Retrieve desired balloon size from the host. + * + * @b: pointer to the balloon. + * + * Return: zero on success, EINVAL if limit does not fit in 32-bit, as required + * by the host-guest protocol and EIO if an error occurred in communicating with + * the host. */ -static bool vmballoon_send_get_target(struct vmballoon *b, u32 *new_target) +static int vmballoon_send_get_target(struct vmballoon *b) { unsigned long status; - unsigned long target; unsigned long limit; - unsigned long dummy = 0; - u32 limit32; - /* - * si_meminfo() is cheap. Moreover, we want to provide dynamic - * max balloon size later. So let us call si_meminfo() every - * iteration. - */ - si_meminfo(&b->sysinfo); - limit = b->sysinfo.totalram; + limit = totalram_pages; /* Ensure limit fits in 32-bits */ - limit32 = (u32)limit; - if (limit != limit32) - return false; - - /* update stats */ - STATS_INC(b->stats.target); + if (limit != (u32)limit) + return -EINVAL; - status = VMWARE_BALLOON_CMD(GET_TARGET, limit, dummy, target); - if (vmballoon_check_status(b, status)) { - *new_target = target; - return true; - } + status = vmballoon_cmd(b, VMW_BALLOON_CMD_GET_TARGET, limit, 0); - pr_debug("%s - failed, hv returns %ld\n", __func__, status); - STATS_INC(b->stats.target_fail); - return false; + return status == VMW_BALLOON_SUCCESS ? 0 : -EIO; } -/* - * Notify the host about allocated page so that host can use it without - * fear that guest will need it. Host may reject some pages, we need to - * check the return value and maybe submit a different page. +/** + * vmballoon_alloc_page_list - allocates a list of pages. + * + * @b: pointer to the balloon. + * @ctl: pointer for the %struct vmballoon_ctl, which defines the operation. + * @req_n_pages: the number of requested pages. + * + * Tries to allocate @req_n_pages. Add them to the list of balloon pages in + * @ctl.pages and updates @ctl.n_pages to reflect the number of pages. + * + * Return: zero on success or error code otherwise. */ -static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn, - unsigned int *hv_status, unsigned int *target) +static int vmballoon_alloc_page_list(struct vmballoon *b, + struct vmballoon_ctl *ctl, + unsigned int req_n_pages) { - unsigned long status, dummy = 0; - u32 pfn32; - - pfn32 = (u32)pfn; - if (pfn32 != pfn) - return -EINVAL; - - STATS_INC(b->stats.lock[false]); + struct page *page; + unsigned int i; - *hv_status = status = VMWARE_BALLOON_CMD(LOCK, pfn, dummy, *target); - if (vmballoon_check_status(b, status)) - return 0; + for (i = 0; i < req_n_pages; i++) { + if (ctl->page_size == VMW_BALLOON_2M_PAGE) + page = alloc_pages(VMW_HUGE_PAGE_ALLOC_FLAGS, + VMW_BALLOON_2M_ORDER); + else + page = alloc_page(VMW_PAGE_ALLOC_FLAGS); - pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status); - STATS_INC(b->stats.lock_fail[false]); - return -EIO; -} + /* Update statistics */ + vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC, + ctl->page_size); -static int vmballoon_send_batched_lock(struct vmballoon *b, - unsigned int num_pages, bool is_2m_pages, unsigned int *target) -{ - unsigned long status; - unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page)); + if (page) { + /* Success. Add the page to the list and continue. */ + list_add(&page->lru, &ctl->pages); + continue; + } - STATS_INC(b->stats.lock[is_2m_pages]); + /* Allocation failed. Update statistics and stop. */ + vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC_FAIL, + ctl->page_size); + break; + } - if (is_2m_pages) - status = VMWARE_BALLOON_CMD(BATCHED_2M_LOCK, pfn, num_pages, - *target); - else - status = VMWARE_BALLOON_CMD(BATCHED_LOCK, pfn, num_pages, - *target); + ctl->n_pages = i; - if (vmballoon_check_status(b, status)) - return 0; - - pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status); - STATS_INC(b->stats.lock_fail[is_2m_pages]); - return 1; + return req_n_pages == ctl->n_pages ? 0 : -ENOMEM; } -/* - * Notify the host that guest intends to release given page back into - * the pool of available (to the guest) pages. +/** + * vmballoon_handle_one_result - Handle lock/unlock result for a single page. + * + * @b: pointer for %struct vmballoon. + * @page: pointer for the page whose result should be handled. + * @page_size: size of the page. + * @status: status of the operation as provided by the hypervisor. */ -static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn, - unsigned int *target) +static int vmballoon_handle_one_result(struct vmballoon *b, struct page *page, + enum vmballoon_page_size_type page_size, + unsigned long status) { - unsigned long status, dummy = 0; - u32 pfn32; - - pfn32 = (u32)pfn; - if (pfn32 != pfn) - return false; + /* On success do nothing. The page is already on the balloon list. */ + if (likely(status == VMW_BALLOON_SUCCESS)) + return 0; - STATS_INC(b->stats.unlock[false]); + pr_debug("%s: failed comm pfn %lx status %lu page_size %s\n", __func__, + page_to_pfn(page), status, + vmballoon_page_size_names[page_size]); - status = VMWARE_BALLOON_CMD(UNLOCK, pfn, dummy, *target); - if (vmballoon_check_status(b, status)) - return true; + /* Error occurred */ + vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC, + page_size); - pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status); - STATS_INC(b->stats.unlock_fail[false]); - return false; + return -EIO; } -static bool vmballoon_send_batched_unlock(struct vmballoon *b, - unsigned int num_pages, bool is_2m_pages, unsigned int *target) +/** + * vmballoon_status_page - returns the status of (un)lock operation + * + * @b: pointer to the balloon. + * @idx: index for the page for which the operation is performed. + * @p: pointer to where the page struct is returned. + * + * Following a lock or unlock operation, returns the status of the operation for + * an individual page. Provides the page that the operation was performed on on + * the @page argument. + * + * Returns: The status of a lock or unlock operation for an individual page. + */ +static unsigned long vmballoon_status_page(struct vmballoon *b, int idx, + struct page **p) { - unsigned long status; - unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page)); - - STATS_INC(b->stats.unlock[is_2m_pages]); - - if (is_2m_pages) - status = VMWARE_BALLOON_CMD(BATCHED_2M_UNLOCK, pfn, num_pages, - *target); - else - status = VMWARE_BALLOON_CMD(BATCHED_UNLOCK, pfn, num_pages, - *target); + if (static_branch_likely(&vmw_balloon_batching)) { + /* batching mode */ + *p = pfn_to_page(b->batch_page[idx].pfn); + return b->batch_page[idx].status; + } - if (vmballoon_check_status(b, status)) - return true; + /* non-batching mode */ + *p = b->page; - pr_debug("%s - batch ppn %lx, hv returns %ld\n", __func__, pfn, status); - STATS_INC(b->stats.unlock_fail[is_2m_pages]); - return false; + /* + * If a failure occurs, the indication will be provided in the status + * of the entire operation, which is considered before the individual + * page status. So for non-batching mode, the indication is always of + * success. + */ + return VMW_BALLOON_SUCCESS; } -static struct page *vmballoon_alloc_page(gfp_t flags, bool is_2m_page) +/** + * vmballoon_lock_op - notifies the host about inflated/deflated pages. + * @b: pointer to the balloon. + * @num_pages: number of inflated/deflated pages. + * @page_size: size of the page. + * @op: the type of operation (lock or unlock). + * + * Notify the host about page(s) that were ballooned (or removed from the + * balloon) so that host can use it without fear that guest will need it (or + * stop using them since the VM does). Host may reject some pages, we need to + * check the return value and maybe submit a different page. The pages that are + * inflated/deflated are pointed by @b->page. + * + * Return: result as provided by the hypervisor. + */ +static unsigned long vmballoon_lock_op(struct vmballoon *b, + unsigned int num_pages, + enum vmballoon_page_size_type page_size, + enum vmballoon_op op) { - if (is_2m_page) - return alloc_pages(flags, VMW_BALLOON_2M_SHIFT); + unsigned long cmd, pfn; - return alloc_page(flags); -} + lockdep_assert_held(&b->comm_lock); -static void vmballoon_free_page(struct page *page, bool is_2m_page) -{ - if (is_2m_page) - __free_pages(page, VMW_BALLOON_2M_SHIFT); - else - __free_page(page); + if (static_branch_likely(&vmw_balloon_batching)) { + if (op == VMW_BALLOON_INFLATE) + cmd = page_size == VMW_BALLOON_2M_PAGE ? + VMW_BALLOON_CMD_BATCHED_2M_LOCK : + VMW_BALLOON_CMD_BATCHED_LOCK; + else + cmd = page_size == VMW_BALLOON_2M_PAGE ? + VMW_BALLOON_CMD_BATCHED_2M_UNLOCK : + VMW_BALLOON_CMD_BATCHED_UNLOCK; + + pfn = PHYS_PFN(virt_to_phys(b->batch_page)); + } else { + cmd = op == VMW_BALLOON_INFLATE ? VMW_BALLOON_CMD_LOCK : + VMW_BALLOON_CMD_UNLOCK; + pfn = page_to_pfn(b->page); + + /* In non-batching mode, PFNs must fit in 32-bit */ + if (unlikely(pfn != (u32)pfn)) + return VMW_BALLOON_ERROR_PPN_INVALID; + } + + return vmballoon_cmd(b, cmd, pfn, num_pages); } -/* - * Quickly release all pages allocated for the balloon. This function is - * called when host decides to "reset" balloon for one reason or another. - * Unlike normal "deflate" we do not (shall not) notify host of the pages - * being released. +/** + * vmballoon_add_page - adds a page towards lock/unlock operation. + * + * @b: pointer to the balloon. + * @idx: index of the page to be ballooned in this batch. + * @p: pointer to the page that is about to be ballooned. + * + * Adds the page to be ballooned. Must be called while holding @comm_lock. */ -static void vmballoon_pop(struct vmballoon *b) +static void vmballoon_add_page(struct vmballoon *b, unsigned int idx, + struct page *p) { - struct page *page, *next; - unsigned is_2m_pages; - - for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES; - is_2m_pages++) { - struct vmballoon_page_size *page_size = - &b->page_sizes[is_2m_pages]; - u16 size_per_page = vmballoon_page_size(is_2m_pages); - - list_for_each_entry_safe(page, next, &page_size->pages, lru) { - list_del(&page->lru); - vmballoon_free_page(page, is_2m_pages); - STATS_INC(b->stats.free[is_2m_pages]); - b->size -= size_per_page; - cond_resched(); - } - } + lockdep_assert_held(&b->comm_lock); - /* Clearing the batch_page unconditionally has no adverse effect */ - free_page((unsigned long)b->batch_page); - b->batch_page = NULL; + if (static_branch_likely(&vmw_balloon_batching)) + b->batch_page[idx] = (struct vmballoon_batch_entry) + { .pfn = page_to_pfn(p) }; + else + b->page = p; } -/* - * Notify the host of a ballooned page. If host rejects the page put it on the - * refuse list, those refused page are then released at the end of the - * inflation cycle. +/** + * vmballoon_lock - lock or unlock a batch of pages. + * + * @b: pointer to the balloon. + * @ctl: pointer for the %struct vmballoon_ctl, which defines the operation. + * + * Notifies the host of about ballooned pages (after inflation or deflation, + * according to @ctl). If the host rejects the page put it on the + * @ctl refuse list. These refused page are then released when moving to the + * next size of pages. + * + * Note that we neither free any @page here nor put them back on the ballooned + * pages list. Instead we queue it for later processing. We do that for several + * reasons. First, we do not want to free the page under the lock. Second, it + * allows us to unify the handling of lock and unlock. In the inflate case, the + * caller will check if there are too many refused pages and release them. + * Although it is not identical to the past behavior, it should not affect + * performance. */ -static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages, - bool is_2m_pages, unsigned int *target) +static int vmballoon_lock(struct vmballoon *b, struct vmballoon_ctl *ctl) { - int locked, hv_status; - struct page *page = b->page; - struct vmballoon_page_size *page_size = &b->page_sizes[false]; - - /* is_2m_pages can never happen as 2m pages support implies batching */ - - locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status, - target); - if (locked) { - STATS_INC(b->stats.refused_alloc[false]); - - if (locked == -EIO && - (hv_status == VMW_BALLOON_ERROR_RESET || - hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED)) { - vmballoon_free_page(page, false); - return -EIO; - } - - /* - * Place page on the list of non-balloonable pages - * and retry allocation, unless we already accumulated - * too many of them, in which case take a breather. - */ - if (page_size->n_refused_pages < VMW_BALLOON_MAX_REFUSED) { - page_size->n_refused_pages++; - list_add(&page->lru, &page_size->refused_pages); - } else { - vmballoon_free_page(page, false); - } - return locked; - } - - /* track allocated page */ - list_add(&page->lru, &page_size->pages); + unsigned long batch_status; + struct page *page; + unsigned int i, num_pages; - /* update balloon size */ - b->size++; + num_pages = ctl->n_pages; + if (num_pages == 0) + return 0; - return 0; -} + /* communication with the host is done under the communication lock */ + spin_lock(&b->comm_lock); -static int vmballoon_lock_batched_page(struct vmballoon *b, - unsigned int num_pages, bool is_2m_pages, unsigned int *target) -{ - int locked, i; - u16 size_per_page = vmballoon_page_size(is_2m_pages); + i = 0; + list_for_each_entry(page, &ctl->pages, lru) + vmballoon_add_page(b, i++, page); - locked = vmballoon_send_batched_lock(b, num_pages, is_2m_pages, - target); - if (locked > 0) { - for (i = 0; i < num_pages; i++) { - u64 pa = vmballoon_batch_get_pa(b->batch_page, i); - struct page *p = pfn_to_page(pa >> PAGE_SHIFT); + batch_status = vmballoon_lock_op(b, ctl->n_pages, ctl->page_size, + ctl->op); - vmballoon_free_page(p, is_2m_pages); - } + /* + * Iterate over the pages in the provided list. Since we are changing + * @ctl->n_pages we are saving the original value in @num_pages and + * use this value to bound the loop. + */ + for (i = 0; i < num_pages; i++) { + unsigned long status; - return -EIO; - } + status = vmballoon_status_page(b, i, &page); - for (i = 0; i < num_pages; i++) { - u64 pa = vmballoon_batch_get_pa(b->batch_page, i); - struct page *p = pfn_to_page(pa >> PAGE_SHIFT); - struct vmballoon_page_size *page_size = - &b->page_sizes[is_2m_pages]; + /* + * Failure of the whole batch overrides a single operation + * results. + */ + if (batch_status != VMW_BALLOON_SUCCESS) + status = batch_status; - locked = vmballoon_batch_get_status(b->batch_page, i); + /* Continue if no error happened */ + if (!vmballoon_handle_one_result(b, page, ctl->page_size, + status)) + continue; - switch (locked) { - case VMW_BALLOON_SUCCESS: - list_add(&p->lru, &page_size->pages); - b->size += size_per_page; - break; - case VMW_BALLOON_ERROR_PPN_PINNED: - case VMW_BALLOON_ERROR_PPN_INVALID: - if (page_size->n_refused_pages - < VMW_BALLOON_MAX_REFUSED) { - list_add(&p->lru, &page_size->refused_pages); - page_size->n_refused_pages++; - break; - } - /* Fallthrough */ - case VMW_BALLOON_ERROR_RESET: - case VMW_BALLOON_ERROR_PPN_NOTNEEDED: - vmballoon_free_page(p, is_2m_pages); - break; - default: - /* This should never happen */ - WARN_ON_ONCE(true); - } + /* + * Error happened. Move the pages to the refused list and update + * the pages number. + */ + list_move(&page->lru, &ctl->refused_pages); + ctl->n_pages--; + ctl->n_refused_pages++; } - return 0; + spin_unlock(&b->comm_lock); + + return batch_status == VMW_BALLOON_SUCCESS ? 0 : -EIO; } -/* - * Release the page allocated for the balloon. Note that we first notify - * the host so it can make sure the page will be available for the guest - * to use, if needed. +/** + * vmballoon_release_page_list() - Releases a page list + * + * @page_list: list of pages to release. + * @n_pages: pointer to the number of pages. + * @page_size: whether the pages in the list are 2MB (or else 4KB). + * + * Releases the list of pages and zeros the number of pages. */ -static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages, - bool is_2m_pages, unsigned int *target) +static void vmballoon_release_page_list(struct list_head *page_list, + int *n_pages, + enum vmballoon_page_size_type page_size) { - struct page *page = b->page; - struct vmballoon_page_size *page_size = &b->page_sizes[false]; - - /* is_2m_pages can never happen as 2m pages support implies batching */ + struct page *page, *tmp; - if (!vmballoon_send_unlock_page(b, page_to_pfn(page), target)) { - list_add(&page->lru, &page_size->pages); - return -EIO; + list_for_each_entry_safe(page, tmp, page_list, lru) { + list_del(&page->lru); + __free_pages(page, vmballoon_page_order(page_size)); } - /* deallocate page */ - vmballoon_free_page(page, false); - STATS_INC(b->stats.free[false]); + *n_pages = 0; +} - /* update balloon size */ - b->size--; - return 0; +/* + * Release pages that were allocated while attempting to inflate the + * balloon but were refused by the host for one reason or another. + */ +static void vmballoon_release_refused_pages(struct vmballoon *b, + struct vmballoon_ctl *ctl) +{ + vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_REFUSED_FREE, + ctl->page_size); + + vmballoon_release_page_list(&ctl->refused_pages, &ctl->n_refused_pages, + ctl->page_size); } -static int vmballoon_unlock_batched_page(struct vmballoon *b, - unsigned int num_pages, bool is_2m_pages, - unsigned int *target) +/** + * vmballoon_change - retrieve the required balloon change + * + * @b: pointer for the balloon. + * + * Return: the required change for the balloon size. A positive number + * indicates inflation, a negative number indicates a deflation. + */ +static int64_t vmballoon_change(struct vmballoon *b) { - int locked, i, ret = 0; - bool hv_success; - u16 size_per_page = vmballoon_page_size(is_2m_pages); + int64_t size, target; - hv_success = vmballoon_send_batched_unlock(b, num_pages, is_2m_pages, - target); - if (!hv_success) - ret = -EIO; + size = atomic64_read(&b->size); + target = READ_ONCE(b->target); - for (i = 0; i < num_pages; i++) { - u64 pa = vmballoon_batch_get_pa(b->batch_page, i); - struct page *p = pfn_to_page(pa >> PAGE_SHIFT); - struct vmballoon_page_size *page_size = - &b->page_sizes[is_2m_pages]; + /* + * We must cast first because of int sizes + * Otherwise we might get huge positives instead of negatives + */ - locked = vmballoon_batch_get_status(b->batch_page, i); - if (!hv_success || locked != VMW_BALLOON_SUCCESS) { - /* - * That page wasn't successfully unlocked by the - * hypervisor, re-add it to the list of pages owned by - * the balloon driver. - */ - list_add(&p->lru, &page_size->pages); - } else { - /* deallocate page */ - vmballoon_free_page(p, is_2m_pages); - STATS_INC(b->stats.free[is_2m_pages]); - - /* update balloon size */ - b->size -= size_per_page; - } - } + if (b->reset_required) + return 0; + + /* consider a 2MB slack on deflate, unless the balloon is emptied */ + if (target < size && target != 0 && + size - target < vmballoon_page_in_frames(VMW_BALLOON_2M_PAGE)) + return 0; - return ret; + return target - size; } -/* - * Release pages that were allocated while attempting to inflate the - * balloon but were refused by the host for one reason or another. +/** + * vmballoon_enqueue_page_list() - Enqueues list of pages after inflation. + * + * @b: pointer to balloon. + * @pages: list of pages to enqueue. + * @n_pages: pointer to number of pages in list. The value is zeroed. + * @page_size: whether the pages are 2MB or 4KB pages. + * + * Enqueues the provides list of pages in the ballooned page list, clears the + * list and zeroes the number of pages that was provided. */ -static void vmballoon_release_refused_pages(struct vmballoon *b, - bool is_2m_pages) +static void vmballoon_enqueue_page_list(struct vmballoon *b, + struct list_head *pages, + unsigned int *n_pages, + enum vmballoon_page_size_type page_size) { - struct page *page, *next; - struct vmballoon_page_size *page_size = - &b->page_sizes[is_2m_pages]; + struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size]; - list_for_each_entry_safe(page, next, &page_size->refused_pages, lru) { - list_del(&page->lru); - vmballoon_free_page(page, is_2m_pages); - STATS_INC(b->stats.refused_free[is_2m_pages]); - } - - page_size->n_refused_pages = 0; + list_splice_init(pages, &page_size_info->pages); + *n_pages = 0; } -static void vmballoon_add_page(struct vmballoon *b, int idx, struct page *p) +/** + * vmballoon_dequeue_page_list() - Dequeues page lists for deflation. + * + * @b: pointer to balloon. + * @pages: list of pages to enqueue. + * @n_pages: pointer to number of pages in list. The value is zeroed. + * @page_size: whether the pages are 2MB or 4KB pages. + * @n_req_pages: the number of requested pages. + * + * Dequeues the number of requested pages from the balloon for deflation. The + * number of dequeued pages may be lower, if not enough pages in the requested + * size are available. + */ +static void vmballoon_dequeue_page_list(struct vmballoon *b, + struct list_head *pages, + unsigned int *n_pages, + enum vmballoon_page_size_type page_size, + unsigned int n_req_pages) { - b->page = p; -} + struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size]; + struct page *page, *tmp; + unsigned int i = 0; -static void vmballoon_add_batched_page(struct vmballoon *b, int idx, - struct page *p) -{ - vmballoon_batch_set_pa(b->batch_page, idx, - (u64)page_to_pfn(p) << PAGE_SHIFT); + list_for_each_entry_safe(page, tmp, &page_size_info->pages, lru) { + list_move(&page->lru, pages); + if (++i == n_req_pages) + break; + } + *n_pages = i; } -/* - * Inflate the balloon towards its target size. Note that we try to limit - * the rate of allocation to make sure we are not choking the rest of the - * system. +/** + * vmballoon_inflate() - Inflate the balloon towards its target size. + * + * @b: pointer to the balloon. */ static void vmballoon_inflate(struct vmballoon *b) { - unsigned int num_pages = 0; - int error = 0; - gfp_t flags = VMW_PAGE_ALLOC_NOSLEEP; - bool is_2m_pages; + int64_t to_inflate_frames; + struct vmballoon_ctl ctl = { + .pages = LIST_HEAD_INIT(ctl.pages), + .refused_pages = LIST_HEAD_INIT(ctl.refused_pages), + .page_size = b->max_page_size, + .op = VMW_BALLOON_INFLATE + }; - pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target); + while ((to_inflate_frames = vmballoon_change(b)) > 0) { + unsigned int to_inflate_pages, page_in_frames; + int alloc_error, lock_error = 0; - /* - * First try NOSLEEP page allocations to inflate balloon. - * - * If we do not throttle nosleep allocations, we can drain all - * free pages in the guest quickly (if the balloon target is high). - * As a side-effect, draining free pages helps to inform (force) - * the guest to start swapping if balloon target is not met yet, - * which is a desired behavior. However, balloon driver can consume - * all available CPU cycles if too many pages are allocated in a - * second. Therefore, we throttle nosleep allocations even when - * the guest is not under memory pressure. OTOH, if we have already - * predicted that the guest is under memory pressure, then we - * slowdown page allocations considerably. - */ + VM_BUG_ON(!list_empty(&ctl.pages)); + VM_BUG_ON(ctl.n_pages != 0); - /* - * Start with no sleep allocation rate which may be higher - * than sleeping allocation rate. - */ - is_2m_pages = b->supported_page_sizes == VMW_BALLOON_NUM_PAGE_SIZES; + page_in_frames = vmballoon_page_in_frames(ctl.page_size); - pr_debug("%s - goal: %d", __func__, b->target - b->size); + to_inflate_pages = min_t(unsigned long, b->batch_max_pages, + DIV_ROUND_UP_ULL(to_inflate_frames, + page_in_frames)); - while (!b->reset_required && - b->size + num_pages * vmballoon_page_size(is_2m_pages) - < b->target) { - struct page *page; + /* Start by allocating */ + alloc_error = vmballoon_alloc_page_list(b, &ctl, + to_inflate_pages); - if (flags == VMW_PAGE_ALLOC_NOSLEEP) - STATS_INC(b->stats.alloc[is_2m_pages]); - else - STATS_INC(b->stats.sleep_alloc); - - page = vmballoon_alloc_page(flags, is_2m_pages); - if (!page) { - STATS_INC(b->stats.alloc_fail[is_2m_pages]); - - if (is_2m_pages) { - b->ops->lock(b, num_pages, true, &b->target); - - /* - * ignore errors from locking as we now switch - * to 4k pages and we might get different - * errors. - */ - - num_pages = 0; - is_2m_pages = false; - continue; - } - - if (flags == VMW_PAGE_ALLOC_CANSLEEP) { - /* - * CANSLEEP page allocation failed, so guest - * is under severe memory pressure. We just log - * the event, but do not stop the inflation - * due to its negative impact on performance. - */ - STATS_INC(b->stats.sleep_alloc_fail); + /* Actually lock the pages by telling the hypervisor */ + lock_error = vmballoon_lock(b, &ctl); + + /* + * If an error indicates that something serious went wrong, + * stop the inflation. + */ + if (lock_error) + break; + + /* Update the balloon size */ + atomic64_add(ctl.n_pages * page_in_frames, &b->size); + + vmballoon_enqueue_page_list(b, &ctl.pages, &ctl.n_pages, + ctl.page_size); + + /* + * If allocation failed or the number of refused pages exceeds + * the maximum allowed, move to the next page size. + */ + if (alloc_error || + ctl.n_refused_pages >= VMW_BALLOON_MAX_REFUSED) { + if (ctl.page_size == VMW_BALLOON_4K_PAGE) break; - } /* - * NOSLEEP page allocation failed, so the guest is - * under memory pressure. Slowing down page alloctions - * seems to be reasonable, but doing so might actually - * cause the hypervisor to throttle us down, resulting - * in degraded performance. We will count on the - * scheduler and standard memory management mechanisms - * for now. + * Ignore errors from locking as we now switch to 4k + * pages and we might get different errors. */ - flags = VMW_PAGE_ALLOC_CANSLEEP; - continue; - } - - b->ops->add_page(b, num_pages++, page); - if (num_pages == b->batch_max_pages) { - error = b->ops->lock(b, num_pages, is_2m_pages, - &b->target); - num_pages = 0; - if (error) - break; + vmballoon_release_refused_pages(b, &ctl); + ctl.page_size--; } cond_resched(); } - if (num_pages > 0) - b->ops->lock(b, num_pages, is_2m_pages, &b->target); - - vmballoon_release_refused_pages(b, true); - vmballoon_release_refused_pages(b, false); + /* + * Release pages that were allocated while attempting to inflate the + * balloon but were refused by the host for one reason or another, + * and update the statistics. + */ + if (ctl.n_refused_pages != 0) + vmballoon_release_refused_pages(b, &ctl); } -/* +/** + * vmballoon_deflate() - Decrease the size of the balloon. + * + * @b: pointer to the balloon + * @n_frames: the number of frames to deflate. If zero, automatically + * calculated according to the target size. + * @coordinated: whether to coordinate with the host + * * Decrease the size of the balloon allowing guest to use more memory. + * + * Return: The number of deflated frames (i.e., basic page size units) */ -static void vmballoon_deflate(struct vmballoon *b) +static unsigned long vmballoon_deflate(struct vmballoon *b, uint64_t n_frames, + bool coordinated) { - unsigned is_2m_pages; - - pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target); + unsigned long deflated_frames = 0; + unsigned long tried_frames = 0; + struct vmballoon_ctl ctl = { + .pages = LIST_HEAD_INIT(ctl.pages), + .refused_pages = LIST_HEAD_INIT(ctl.refused_pages), + .page_size = VMW_BALLOON_4K_PAGE, + .op = VMW_BALLOON_DEFLATE + }; /* free pages to reach target */ - for (is_2m_pages = 0; is_2m_pages < b->supported_page_sizes; - is_2m_pages++) { - struct page *page, *next; - unsigned int num_pages = 0; - struct vmballoon_page_size *page_size = - &b->page_sizes[is_2m_pages]; - - list_for_each_entry_safe(page, next, &page_size->pages, lru) { - if (b->reset_required || - (b->target > 0 && - b->size - num_pages - * vmballoon_page_size(is_2m_pages) - < b->target + vmballoon_page_size(true))) - break; + while (true) { + unsigned int to_deflate_pages, n_unlocked_frames; + unsigned int page_in_frames; + int64_t to_deflate_frames; + bool deflated_all; + + page_in_frames = vmballoon_page_in_frames(ctl.page_size); + + VM_BUG_ON(!list_empty(&ctl.pages)); + VM_BUG_ON(ctl.n_pages); + VM_BUG_ON(!list_empty(&ctl.refused_pages)); + VM_BUG_ON(ctl.n_refused_pages); + + /* + * If we were requested a specific number of frames, we try to + * deflate this number of frames. Otherwise, deflation is + * performed according to the target and balloon size. + */ + to_deflate_frames = n_frames ? n_frames - tried_frames : + -vmballoon_change(b); + + /* break if no work to do */ + if (to_deflate_frames <= 0) + break; + + /* + * Calculate the number of frames based on current page size, + * but limit the deflated frames to a single chunk + */ + to_deflate_pages = min_t(unsigned long, b->batch_max_pages, + DIV_ROUND_UP_ULL(to_deflate_frames, + page_in_frames)); + + /* First take the pages from the balloon pages. */ + vmballoon_dequeue_page_list(b, &ctl.pages, &ctl.n_pages, + ctl.page_size, to_deflate_pages); + + /* + * Before pages are moving to the refused list, count their + * frames as frames that we tried to deflate. + */ + tried_frames += ctl.n_pages * page_in_frames; + + /* + * Unlock the pages by communicating with the hypervisor if the + * communication is coordinated (i.e., not pop). We ignore the + * return code. Instead we check if all the pages we manage to + * unlock all the pages. If we failed, we will move to the next + * page size, and would eventually try again later. + */ + if (coordinated) + vmballoon_lock(b, &ctl); + + /* + * Check if we deflated enough. We will move to the next page + * size if we did not manage to do so. This calculation takes + * place now, as once the pages are released, the number of + * pages is zeroed. + */ + deflated_all = (ctl.n_pages == to_deflate_pages); + + /* Update local and global counters */ + n_unlocked_frames = ctl.n_pages * page_in_frames; + atomic64_sub(n_unlocked_frames, &b->size); + deflated_frames += n_unlocked_frames; - list_del(&page->lru); - b->ops->add_page(b, num_pages++, page); + vmballoon_stats_page_add(b, VMW_BALLOON_PAGE_STAT_FREE, + ctl.page_size, ctl.n_pages); - if (num_pages == b->batch_max_pages) { - int error; + /* free the ballooned pages */ + vmballoon_release_page_list(&ctl.pages, &ctl.n_pages, + ctl.page_size); - error = b->ops->unlock(b, num_pages, - is_2m_pages, &b->target); - num_pages = 0; - if (error) - return; - } + /* Return the refused pages to the ballooned list. */ + vmballoon_enqueue_page_list(b, &ctl.refused_pages, + &ctl.n_refused_pages, + ctl.page_size); - cond_resched(); + /* If we failed to unlock all the pages, move to next size. */ + if (!deflated_all) { + if (ctl.page_size == b->max_page_size) + break; + ctl.page_size++; } - if (num_pages > 0) - b->ops->unlock(b, num_pages, is_2m_pages, &b->target); + cond_resched(); } -} -static const struct vmballoon_ops vmballoon_basic_ops = { - .add_page = vmballoon_add_page, - .lock = vmballoon_lock_page, - .unlock = vmballoon_unlock_page -}; + return deflated_frames; +} -static const struct vmballoon_ops vmballoon_batched_ops = { - .add_page = vmballoon_add_batched_page, - .lock = vmballoon_lock_batched_page, - .unlock = vmballoon_unlock_batched_page -}; +/** + * vmballoon_deinit_batching - disables batching mode. + * + * @b: pointer to &struct vmballoon. + * + * Disables batching, by deallocating the page for communication with the + * hypervisor and disabling the static key to indicate that batching is off. + */ +static void vmballoon_deinit_batching(struct vmballoon *b) +{ + free_page((unsigned long)b->batch_page); + b->batch_page = NULL; + static_branch_disable(&vmw_balloon_batching); + b->batch_max_pages = 1; +} -static bool vmballoon_init_batching(struct vmballoon *b) +/** + * vmballoon_init_batching - enable batching mode. + * + * @b: pointer to &struct vmballoon. + * + * Enables batching, by allocating a page for communication with the hypervisor + * and enabling the static_key to use batching. + * + * Return: zero on success or an appropriate error-code. + */ +static int vmballoon_init_batching(struct vmballoon *b) { struct page *page; page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (!page) - return false; + return -ENOMEM; b->batch_page = page_address(page); - return true; + b->batch_max_pages = PAGE_SIZE / sizeof(struct vmballoon_batch_entry); + + static_branch_enable(&vmw_balloon_batching); + + return 0; } /* @@ -932,7 +1197,7 @@ static void vmballoon_doorbell(void *client_data) { struct vmballoon *b = client_data; - STATS_INC(b->stats.doorbell); + vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_DOORBELL); mod_delayed_work(system_freezable_wq, &b->dwork, 0); } @@ -942,11 +1207,8 @@ static void vmballoon_doorbell(void *client_data) */ static void vmballoon_vmci_cleanup(struct vmballoon *b) { - int error; - - VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, VMCI_INVALID_ID, - VMCI_INVALID_ID, error); - STATS_INC(b->stats.doorbell_unset); + vmballoon_cmd(b, VMW_BALLOON_CMD_VMCI_DOORBELL_SET, + VMCI_INVALID_ID, VMCI_INVALID_ID); if (!vmci_handle_is_invalid(b->vmci_doorbell)) { vmci_doorbell_destroy(b->vmci_doorbell); @@ -954,12 +1216,19 @@ static void vmballoon_vmci_cleanup(struct vmballoon *b) } } -/* - * Initialize vmci doorbell, to get notified as soon as balloon changes +/** + * vmballoon_vmci_init - Initialize vmci doorbell. + * + * @b: pointer to the balloon. + * + * Return: zero on success or when wakeup command not supported. Error-code + * otherwise. + * + * Initialize vmci doorbell, to get notified as soon as balloon changes. */ static int vmballoon_vmci_init(struct vmballoon *b) { - unsigned long error, dummy; + unsigned long error; if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0) return 0; @@ -971,10 +1240,9 @@ static int vmballoon_vmci_init(struct vmballoon *b) if (error != VMCI_SUCCESS) goto fail; - error = VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, b->vmci_doorbell.context, - b->vmci_doorbell.resource, dummy); - - STATS_INC(b->stats.doorbell_set); + error = __vmballoon_cmd(b, VMW_BALLOON_CMD_VMCI_DOORBELL_SET, + b->vmci_doorbell.context, + b->vmci_doorbell.resource, NULL); if (error != VMW_BALLOON_SUCCESS) goto fail; @@ -985,6 +1253,23 @@ fail: return -EIO; } +/** + * vmballoon_pop - Quickly release all pages allocate for the balloon. + * + * @b: pointer to the balloon. + * + * This function is called when host decides to "reset" balloon for one reason + * or another. Unlike normal "deflate" we do not (shall not) notify host of the + * pages being released. + */ +static void vmballoon_pop(struct vmballoon *b) +{ + unsigned long size; + + while ((size = atomic64_read(&b->size))) + vmballoon_deflate(b, size, false); +} + /* * Perform standard reset sequence by popping the balloon (in case it * is not empty) and then restarting protocol. This operation normally @@ -994,18 +1279,18 @@ static void vmballoon_reset(struct vmballoon *b) { int error; + down_write(&b->conf_sem); + vmballoon_vmci_cleanup(b); /* free all pages, skipping monitor unlock */ vmballoon_pop(b); - if (!vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES)) + if (vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES)) return; if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) { - b->ops = &vmballoon_batched_ops; - b->batch_max_pages = VMW_BALLOON_BATCH_MAX_PAGES; - if (!vmballoon_init_batching(b)) { + if (vmballoon_init_batching(b)) { /* * We failed to initialize batching, inform the monitor * about it by sending a null capability. @@ -1016,52 +1301,70 @@ static void vmballoon_reset(struct vmballoon *b) return; } } else if ((b->capabilities & VMW_BALLOON_BASIC_CMDS) != 0) { - b->ops = &vmballoon_basic_ops; - b->batch_max_pages = 1; + vmballoon_deinit_batching(b); } + vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_RESET); b->reset_required = false; error = vmballoon_vmci_init(b); if (error) pr_err("failed to initialize vmci doorbell\n"); - if (!vmballoon_send_guest_id(b)) + if (vmballoon_send_guest_id(b)) pr_err("failed to send guest ID to the host\n"); + + up_write(&b->conf_sem); } -/* - * Balloon work function: reset protocol, if needed, get the new size and - * adjust balloon as needed. Repeat in 1 sec. +/** + * vmballoon_work - periodic balloon worker for reset, inflation and deflation. + * + * @work: pointer to the &work_struct which is provided by the workqueue. + * + * Resets the protocol if needed, gets the new size and adjusts balloon as + * needed. Repeat in 1 sec. */ static void vmballoon_work(struct work_struct *work) { struct delayed_work *dwork = to_delayed_work(work); struct vmballoon *b = container_of(dwork, struct vmballoon, dwork); - unsigned int target; - - STATS_INC(b->stats.timer); + int64_t change = 0; if (b->reset_required) vmballoon_reset(b); - if (!b->reset_required && vmballoon_send_get_target(b, &target)) { - /* update target, adjust size */ - b->target = target; + down_read(&b->conf_sem); + + /* + * Update the stats while holding the semaphore to ensure that + * @stats_enabled is consistent with whether the stats are actually + * enabled + */ + vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_TIMER); + + if (!vmballoon_send_get_target(b)) + change = vmballoon_change(b); + + if (change != 0) { + pr_debug("%s - size: %llu, target %lu\n", __func__, + atomic64_read(&b->size), READ_ONCE(b->target)); - if (b->size < target) + if (change > 0) vmballoon_inflate(b); - else if (target == 0 || - b->size > target + vmballoon_page_size(true)) - vmballoon_deflate(b); + else /* (change < 0) */ + vmballoon_deflate(b, 0, true); } + up_read(&b->conf_sem); + /* * We are using a freezable workqueue so that balloon operations are * stopped while the system transitions to/from sleep/hibernation. */ queue_delayed_work(system_freezable_wq, dwork, round_jiffies_relative(HZ)); + } /* @@ -1069,64 +1372,100 @@ static void vmballoon_work(struct work_struct *work) */ #ifdef CONFIG_DEBUG_FS +static const char * const vmballoon_stat_page_names[] = { + [VMW_BALLOON_PAGE_STAT_ALLOC] = "alloc", + [VMW_BALLOON_PAGE_STAT_ALLOC_FAIL] = "allocFail", + [VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC] = "errAlloc", + [VMW_BALLOON_PAGE_STAT_REFUSED_FREE] = "errFree", + [VMW_BALLOON_PAGE_STAT_FREE] = "free" +}; + +static const char * const vmballoon_stat_names[] = { + [VMW_BALLOON_STAT_TIMER] = "timer", + [VMW_BALLOON_STAT_DOORBELL] = "doorbell", + [VMW_BALLOON_STAT_RESET] = "reset", +}; + +static int vmballoon_enable_stats(struct vmballoon *b) +{ + int r = 0; + + down_write(&b->conf_sem); + + /* did we somehow race with another reader which enabled stats? */ + if (b->stats) + goto out; + + b->stats = kzalloc(sizeof(*b->stats), GFP_KERNEL); + + if (!b->stats) { + /* allocation failed */ + r = -ENOMEM; + goto out; + } + static_key_enable(&balloon_stat_enabled.key); +out: + up_write(&b->conf_sem); + return r; +} + +/** + * vmballoon_debug_show - shows statistics of balloon operations. + * @f: pointer to the &struct seq_file. + * @offset: ignored. + * + * Provides the statistics that can be accessed in vmmemctl in the debugfs. + * To avoid the overhead - mainly that of memory - of collecting the statistics, + * we only collect statistics after the first time the counters are read. + * + * Return: zero on success or an error code. + */ static int vmballoon_debug_show(struct seq_file *f, void *offset) { struct vmballoon *b = f->private; - struct vmballoon_stats *stats = &b->stats; + int i, j; + + /* enables stats if they are disabled */ + if (!b->stats) { + int r = vmballoon_enable_stats(b); + + if (r) + return r; + } /* format capabilities info */ - seq_printf(f, - "balloon capabilities: %#4x\n" - "used capabilities: %#4lx\n" - "is resetting: %c\n", - VMW_BALLOON_CAPABILITIES, b->capabilities, - b->reset_required ? 'y' : 'n'); + seq_printf(f, "%-22s: %#16x\n", "balloon capabilities", + VMW_BALLOON_CAPABILITIES); + seq_printf(f, "%-22s: %#16lx\n", "used capabilities", b->capabilities); + seq_printf(f, "%-22s: %16s\n", "is resetting", + b->reset_required ? "y" : "n"); /* format size info */ - seq_printf(f, - "target: %8d pages\n" - "current: %8d pages\n", - b->target, b->size); - - seq_printf(f, - "\n" - "timer: %8u\n" - "doorbell: %8u\n" - "start: %8u (%4u failed)\n" - "guestType: %8u (%4u failed)\n" - "2m-lock: %8u (%4u failed)\n" - "lock: %8u (%4u failed)\n" - "2m-unlock: %8u (%4u failed)\n" - "unlock: %8u (%4u failed)\n" - "target: %8u (%4u failed)\n" - "prim2mAlloc: %8u (%4u failed)\n" - "primNoSleepAlloc: %8u (%4u failed)\n" - "primCanSleepAlloc: %8u (%4u failed)\n" - "prim2mFree: %8u\n" - "primFree: %8u\n" - "err2mAlloc: %8u\n" - "errAlloc: %8u\n" - "err2mFree: %8u\n" - "errFree: %8u\n" - "doorbellSet: %8u\n" - "doorbellUnset: %8u\n", - stats->timer, - stats->doorbell, - stats->start, stats->start_fail, - stats->guest_type, stats->guest_type_fail, - stats->lock[true], stats->lock_fail[true], - stats->lock[false], stats->lock_fail[false], - stats->unlock[true], stats->unlock_fail[true], - stats->unlock[false], stats->unlock_fail[false], - stats->target, stats->target_fail, - stats->alloc[true], stats->alloc_fail[true], - stats->alloc[false], stats->alloc_fail[false], - stats->sleep_alloc, stats->sleep_alloc_fail, - stats->free[true], - stats->free[false], - stats->refused_alloc[true], stats->refused_alloc[false], - stats->refused_free[true], stats->refused_free[false], - stats->doorbell_set, stats->doorbell_unset); + seq_printf(f, "%-22s: %16lu\n", "target", READ_ONCE(b->target)); + seq_printf(f, "%-22s: %16llu\n", "current", atomic64_read(&b->size)); + + for (i = 0; i < VMW_BALLOON_CMD_NUM; i++) { + if (vmballoon_cmd_names[i] == NULL) + continue; + + seq_printf(f, "%-22s: %16llu (%llu failed)\n", + vmballoon_cmd_names[i], + atomic64_read(&b->stats->ops[i][VMW_BALLOON_OP_STAT]), + atomic64_read(&b->stats->ops[i][VMW_BALLOON_OP_FAIL_STAT])); + } + + for (i = 0; i < VMW_BALLOON_STAT_NUM; i++) + seq_printf(f, "%-22s: %16llu\n", + vmballoon_stat_names[i], + atomic64_read(&b->stats->general_stat[i])); + + for (i = 0; i < VMW_BALLOON_PAGE_STAT_NUM; i++) { + for (j = 0; j < VMW_BALLOON_NUM_PAGE_SIZES; j++) + seq_printf(f, "%-18s(%s): %16llu\n", + vmballoon_stat_page_names[i], + vmballoon_page_size_names[j], + atomic64_read(&b->stats->page_stat[i][j])); + } return 0; } @@ -1161,7 +1500,10 @@ static int __init vmballoon_debugfs_init(struct vmballoon *b) static void __exit vmballoon_debugfs_exit(struct vmballoon *b) { + static_key_disable(&balloon_stat_enabled.key); debugfs_remove(b->dbg_entry); + kfree(b->stats); + b->stats = NULL; } #else @@ -1179,8 +1521,9 @@ static inline void vmballoon_debugfs_exit(struct vmballoon *b) static int __init vmballoon_init(void) { + enum vmballoon_page_size_type page_size; int error; - unsigned is_2m_pages; + /* * Check if we are running on VMware's hypervisor and bail out * if we are not. @@ -1188,11 +1531,10 @@ static int __init vmballoon_init(void) if (x86_hyper_type != X86_HYPER_VMWARE) return -ENODEV; - for (is_2m_pages = 0; is_2m_pages < VMW_BALLOON_NUM_PAGE_SIZES; - is_2m_pages++) { - INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].pages); - INIT_LIST_HEAD(&balloon.page_sizes[is_2m_pages].refused_pages); - } + for (page_size = VMW_BALLOON_4K_PAGE; + page_size <= VMW_BALLOON_LAST_SIZE; page_size++) + INIT_LIST_HEAD(&balloon.page_sizes[page_size].pages); + INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work); @@ -1200,6 +1542,8 @@ static int __init vmballoon_init(void) if (error) return error; + spin_lock_init(&balloon.comm_lock); + init_rwsem(&balloon.conf_sem); balloon.vmci_doorbell = VMCI_INVALID_HANDLE; balloon.batch_page = NULL; balloon.page = NULL; diff --git a/drivers/misc/vmw_vmci/vmci_driver.c b/drivers/misc/vmw_vmci/vmci_driver.c @@ -113,5 +113,5 @@ module_exit(vmci_drv_exit); MODULE_AUTHOR("VMware, Inc."); MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface."); -MODULE_VERSION("1.1.5.0-k"); +MODULE_VERSION("1.1.6.0-k"); MODULE_LICENSE("GPL v2"); diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c @@ -15,7 +15,6 @@ #include <linux/vmw_vmci_defs.h> #include <linux/vmw_vmci_api.h> -#include <linux/moduleparam.h> #include <linux/miscdevice.h> #include <linux/interrupt.h> #include <linux/highmem.h> @@ -448,15 +447,12 @@ static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev, struct vmci_handle handle; int vmci_status; int __user *retptr; - u32 cid; if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) { vmci_ioctl_err("only valid for contexts\n"); return -EINVAL; } - cid = vmci_ctx_get_id(vmci_host_dev->context); - if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) { struct vmci_qp_alloc_info_vmvm alloc_info; struct vmci_qp_alloc_info_vmvm __user *info = uptr; diff --git a/drivers/misc/vmw_vmci/vmci_resource.c b/drivers/misc/vmw_vmci/vmci_resource.c @@ -57,7 +57,8 @@ static struct vmci_resource *vmci_resource_lookup(struct vmci_handle handle, if (r->type == type && rid == handle.resource && - (cid == handle.context || cid == VMCI_INVALID_ID)) { + (cid == handle.context || cid == VMCI_INVALID_ID || + handle.context == VMCI_INVALID_ID)) { resource = r; break; } diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c @@ -1,17 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * nvmem framework core. * * Copyright (C) 2015 Srinivas Kandagatla <srinivas.kandagatla@linaro.org> * Copyright (C) 2013 Maxime Ripard <maxime.ripard@free-electrons.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/device.h> @@ -19,6 +11,7 @@ #include <linux/fs.h> #include <linux/idr.h> #include <linux/init.h> +#include <linux/kref.h> #include <linux/module.h> #include <linux/nvmem-consumer.h> #include <linux/nvmem-provider.h> @@ -26,18 +19,18 @@ #include <linux/slab.h> struct nvmem_device { - const char *name; struct module *owner; struct device dev; int stride; int word_size; int id; - int users; + struct kref refcnt; size_t size; bool read_only; int flags; struct bin_attribute eeprom; struct device *base_dev; + struct list_head cells; nvmem_reg_read_t reg_read; nvmem_reg_write_t reg_write; void *priv; @@ -58,8 +51,13 @@ struct nvmem_cell { static DEFINE_MUTEX(nvmem_mutex); static DEFINE_IDA(nvmem_ida); -static LIST_HEAD(nvmem_cells); -static DEFINE_MUTEX(nvmem_cells_mutex); +static DEFINE_MUTEX(nvmem_cell_mutex); +static LIST_HEAD(nvmem_cell_tables); + +static DEFINE_MUTEX(nvmem_lookup_mutex); +static LIST_HEAD(nvmem_lookup_list); + +static BLOCKING_NOTIFIER_HEAD(nvmem_notifier); #ifdef CONFIG_DEBUG_LOCK_ALLOC static struct lock_class_key eeprom_lock_key; @@ -156,7 +154,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, static struct bin_attribute bin_attr_rw_nvmem = { .attr = { .name = "nvmem", - .mode = S_IWUSR | S_IRUGO, + .mode = 0644, }, .read = bin_attr_nvmem_read, .write = bin_attr_nvmem_write, @@ -180,7 +178,7 @@ static const struct attribute_group *nvmem_rw_dev_groups[] = { static struct bin_attribute bin_attr_ro_nvmem = { .attr = { .name = "nvmem", - .mode = S_IRUGO, + .mode = 0444, }, .read = bin_attr_nvmem_read, }; @@ -203,7 +201,7 @@ static const struct attribute_group *nvmem_ro_dev_groups[] = { static struct bin_attribute bin_attr_rw_root_nvmem = { .attr = { .name = "nvmem", - .mode = S_IWUSR | S_IRUSR, + .mode = 0600, }, .read = bin_attr_nvmem_read, .write = bin_attr_nvmem_write, @@ -227,7 +225,7 @@ static const struct attribute_group *nvmem_rw_root_dev_groups[] = { static struct bin_attribute bin_attr_ro_root_nvmem = { .attr = { .name = "nvmem", - .mode = S_IRUSR, + .mode = 0400, }, .read = bin_attr_nvmem_read, }; @@ -282,48 +280,42 @@ static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np) return to_nvmem_device(d); } -static struct nvmem_cell *nvmem_find_cell(const char *cell_id) +static struct nvmem_device *nvmem_find(const char *name) { - struct nvmem_cell *p; - - mutex_lock(&nvmem_cells_mutex); + struct device *d; - list_for_each_entry(p, &nvmem_cells, node) - if (!strcmp(p->name, cell_id)) { - mutex_unlock(&nvmem_cells_mutex); - return p; - } + d = bus_find_device_by_name(&nvmem_bus_type, NULL, name); - mutex_unlock(&nvmem_cells_mutex); + if (!d) + return NULL; - return NULL; + return to_nvmem_device(d); } static void nvmem_cell_drop(struct nvmem_cell *cell) { - mutex_lock(&nvmem_cells_mutex); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell); + mutex_lock(&nvmem_mutex); list_del(&cell->node); - mutex_unlock(&nvmem_cells_mutex); + mutex_unlock(&nvmem_mutex); + kfree(cell->name); kfree(cell); } static void nvmem_device_remove_all_cells(const struct nvmem_device *nvmem) { - struct nvmem_cell *cell; - struct list_head *p, *n; + struct nvmem_cell *cell, *p; - list_for_each_safe(p, n, &nvmem_cells) { - cell = list_entry(p, struct nvmem_cell, node); - if (cell->nvmem == nvmem) - nvmem_cell_drop(cell); - } + list_for_each_entry_safe(cell, p, &nvmem->cells, node) + nvmem_cell_drop(cell); } static void nvmem_cell_add(struct nvmem_cell *cell) { - mutex_lock(&nvmem_cells_mutex); - list_add_tail(&cell->node, &nvmem_cells); - mutex_unlock(&nvmem_cells_mutex); + mutex_lock(&nvmem_mutex); + list_add_tail(&cell->node, &cell->nvmem->cells); + mutex_unlock(&nvmem_mutex); + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_ADD, cell); } static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem, @@ -361,7 +353,7 @@ static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem, * * Return: 0 or negative error code on failure. */ -int nvmem_add_cells(struct nvmem_device *nvmem, +static int nvmem_add_cells(struct nvmem_device *nvmem, const struct nvmem_cell_info *info, int ncells) { @@ -400,7 +392,6 @@ err: return rval; } -EXPORT_SYMBOL_GPL(nvmem_add_cells); /* * nvmem_setup_compat() - Create an additional binary entry in @@ -440,6 +431,136 @@ static int nvmem_setup_compat(struct nvmem_device *nvmem, } /** + * nvmem_register_notifier() - Register a notifier block for nvmem events. + * + * @nb: notifier block to be called on nvmem events. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_register_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_register_notifier); + +/** + * nvmem_unregister_notifier() - Unregister a notifier block for nvmem events. + * + * @nb: notifier block to be unregistered. + * + * Return: 0 on success, negative error number on failure. + */ +int nvmem_unregister_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&nvmem_notifier, nb); +} +EXPORT_SYMBOL_GPL(nvmem_unregister_notifier); + +static int nvmem_add_cells_from_table(struct nvmem_device *nvmem) +{ + const struct nvmem_cell_info *info; + struct nvmem_cell_table *table; + struct nvmem_cell *cell; + int rval = 0, i; + + mutex_lock(&nvmem_cell_mutex); + list_for_each_entry(table, &nvmem_cell_tables, node) { + if (strcmp(nvmem_dev_name(nvmem), table->nvmem_name) == 0) { + for (i = 0; i < table->ncells; i++) { + info = &table->cells[i]; + + cell = kzalloc(sizeof(*cell), GFP_KERNEL); + if (!cell) { + rval = -ENOMEM; + goto out; + } + + rval = nvmem_cell_info_to_nvmem_cell(nvmem, + info, + cell); + if (rval) { + kfree(cell); + goto out; + } + + nvmem_cell_add(cell); + } + } + } + +out: + mutex_unlock(&nvmem_cell_mutex); + return rval; +} + +static struct nvmem_cell * +nvmem_find_cell_by_name(struct nvmem_device *nvmem, const char *cell_id) +{ + struct nvmem_cell *cell = NULL; + + mutex_lock(&nvmem_mutex); + list_for_each_entry(cell, &nvmem->cells, node) { + if (strcmp(cell_id, cell->name) == 0) + break; + } + mutex_unlock(&nvmem_mutex); + + return cell; +} + +static int nvmem_add_cells_from_of(struct nvmem_device *nvmem) +{ + struct device_node *parent, *child; + struct device *dev = &nvmem->dev; + struct nvmem_cell *cell; + const __be32 *addr; + int len; + + parent = dev->of_node; + + for_each_child_of_node(parent, child) { + addr = of_get_property(child, "reg", &len); + if (!addr || (len < 2 * sizeof(u32))) { + dev_err(dev, "nvmem: invalid reg on %pOF\n", child); + return -EINVAL; + } + + cell = kzalloc(sizeof(*cell), GFP_KERNEL); + if (!cell) + return -ENOMEM; + + cell->nvmem = nvmem; + cell->offset = be32_to_cpup(addr++); + cell->bytes = be32_to_cpup(addr); + cell->name = kasprintf(GFP_KERNEL, "%pOFn", child); + + addr = of_get_property(child, "bits", &len); + if (addr && len == (2 * sizeof(u32))) { + cell->bit_offset = be32_to_cpup(addr++); + cell->nbits = be32_to_cpup(addr); + } + + if (cell->nbits) + cell->bytes = DIV_ROUND_UP( + cell->nbits + cell->bit_offset, + BITS_PER_BYTE); + + if (!IS_ALIGNED(cell->offset, nvmem->stride)) { + dev_err(dev, "cell %s unaligned to nvmem stride %d\n", + cell->name, nvmem->stride); + /* Cells already added will be freed later. */ + kfree(cell->name); + kfree(cell); + return -EINVAL; + } + + nvmem_cell_add(cell); + } + + return 0; +} + +/** * nvmem_register() - Register a nvmem device for given nvmem_config. * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem * @@ -467,6 +588,9 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) return ERR_PTR(rval); } + kref_init(&nvmem->refcnt); + INIT_LIST_HEAD(&nvmem->cells); + nvmem->id = rval; nvmem->owner = config->owner; if (!nvmem->owner && config->dev->driver) @@ -516,11 +640,31 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) goto err_device_del; } - if (config->cells) - nvmem_add_cells(nvmem, config->cells, config->ncells); + if (config->cells) { + rval = nvmem_add_cells(nvmem, config->cells, config->ncells); + if (rval) + goto err_teardown_compat; + } + + rval = nvmem_add_cells_from_table(nvmem); + if (rval) + goto err_remove_cells; + + rval = nvmem_add_cells_from_of(nvmem); + if (rval) + goto err_remove_cells; + + rval = blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem); + if (rval) + goto err_remove_cells; return nvmem; +err_remove_cells: + nvmem_device_remove_all_cells(nvmem); +err_teardown_compat: + if (config->compat) + device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); err_device_del: device_del(&nvmem->dev); err_put_device: @@ -530,21 +674,13 @@ err_put_device: } EXPORT_SYMBOL_GPL(nvmem_register); -/** - * nvmem_unregister() - Unregister previously registered nvmem device - * - * @nvmem: Pointer to previously registered nvmem device. - * - * Return: Will be an negative on error or a zero on success. - */ -int nvmem_unregister(struct nvmem_device *nvmem) +static void nvmem_device_release(struct kref *kref) { - mutex_lock(&nvmem_mutex); - if (nvmem->users) { - mutex_unlock(&nvmem_mutex); - return -EBUSY; - } - mutex_unlock(&nvmem_mutex); + struct nvmem_device *nvmem; + + nvmem = container_of(kref, struct nvmem_device, refcnt); + + blocking_notifier_call_chain(&nvmem_notifier, NVMEM_REMOVE, nvmem); if (nvmem->flags & FLAG_COMPAT) device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); @@ -552,14 +688,22 @@ int nvmem_unregister(struct nvmem_device *nvmem) nvmem_device_remove_all_cells(nvmem); device_del(&nvmem->dev); put_device(&nvmem->dev); +} - return 0; +/** + * nvmem_unregister() - Unregister previously registered nvmem device + * + * @nvmem: Pointer to previously registered nvmem device. + */ +void nvmem_unregister(struct nvmem_device *nvmem) +{ + kref_put(&nvmem->refcnt, nvmem_device_release); } EXPORT_SYMBOL_GPL(nvmem_unregister); static void devm_nvmem_release(struct device *dev, void *res) { - WARN_ON(nvmem_unregister(*(struct nvmem_device **)res)); + nvmem_unregister(*(struct nvmem_device **)res); } /** @@ -617,71 +761,34 @@ int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem) } EXPORT_SYMBOL(devm_nvmem_unregister); - static struct nvmem_device *__nvmem_device_get(struct device_node *np, - struct nvmem_cell **cellp, - const char *cell_id) + const char *nvmem_name) { struct nvmem_device *nvmem = NULL; mutex_lock(&nvmem_mutex); - - if (np) { - nvmem = of_nvmem_find(np); - if (!nvmem) { - mutex_unlock(&nvmem_mutex); - return ERR_PTR(-EPROBE_DEFER); - } - } else { - struct nvmem_cell *cell = nvmem_find_cell(cell_id); - - if (cell) { - nvmem = cell->nvmem; - *cellp = cell; - } - - if (!nvmem) { - mutex_unlock(&nvmem_mutex); - return ERR_PTR(-ENOENT); - } - } - - nvmem->users++; + nvmem = np ? of_nvmem_find(np) : nvmem_find(nvmem_name); mutex_unlock(&nvmem_mutex); + if (!nvmem) + return ERR_PTR(-EPROBE_DEFER); if (!try_module_get(nvmem->owner)) { dev_err(&nvmem->dev, "could not increase module refcount for cell %s\n", - nvmem->name); - - mutex_lock(&nvmem_mutex); - nvmem->users--; - mutex_unlock(&nvmem_mutex); + nvmem_dev_name(nvmem)); return ERR_PTR(-EINVAL); } + kref_get(&nvmem->refcnt); + return nvmem; } static void __nvmem_device_put(struct nvmem_device *nvmem) { module_put(nvmem->owner); - mutex_lock(&nvmem_mutex); - nvmem->users--; - mutex_unlock(&nvmem_mutex); -} - -static struct nvmem_device *nvmem_find(const char *name) -{ - struct device *d; - - d = bus_find_device_by_name(&nvmem_bus_type, NULL, name); - - if (!d) - return NULL; - - return to_nvmem_device(d); + kref_put(&nvmem->refcnt, nvmem_device_release); } #if IS_ENABLED(CONFIG_OF) @@ -706,7 +813,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id) if (!nvmem_np) return ERR_PTR(-EINVAL); - return __nvmem_device_get(nvmem_np, NULL, NULL); + return __nvmem_device_get(nvmem_np, NULL); } EXPORT_SYMBOL_GPL(of_nvmem_device_get); #endif @@ -810,44 +917,86 @@ struct nvmem_device *devm_nvmem_device_get(struct device *dev, const char *id) } EXPORT_SYMBOL_GPL(devm_nvmem_device_get); -static struct nvmem_cell *nvmem_cell_get_from_list(const char *cell_id) +static struct nvmem_cell * +nvmem_cell_get_from_lookup(struct device *dev, const char *con_id) { - struct nvmem_cell *cell = NULL; + struct nvmem_cell *cell = ERR_PTR(-ENOENT); + struct nvmem_cell_lookup *lookup; struct nvmem_device *nvmem; + const char *dev_id; - nvmem = __nvmem_device_get(NULL, &cell, cell_id); - if (IS_ERR(nvmem)) - return ERR_CAST(nvmem); + if (!dev) + return ERR_PTR(-EINVAL); + dev_id = dev_name(dev); + + mutex_lock(&nvmem_lookup_mutex); + + list_for_each_entry(lookup, &nvmem_lookup_list, node) { + if ((strcmp(lookup->dev_id, dev_id) == 0) && + (strcmp(lookup->con_id, con_id) == 0)) { + /* This is the right entry. */ + nvmem = __nvmem_device_get(NULL, lookup->nvmem_name); + if (IS_ERR(nvmem)) { + /* Provider may not be registered yet. */ + cell = ERR_CAST(nvmem); + goto out; + } + + cell = nvmem_find_cell_by_name(nvmem, + lookup->cell_name); + if (!cell) { + __nvmem_device_put(nvmem); + cell = ERR_PTR(-ENOENT); + goto out; + } + } + } + +out: + mutex_unlock(&nvmem_lookup_mutex); return cell; } #if IS_ENABLED(CONFIG_OF) +static struct nvmem_cell * +nvmem_find_cell_by_index(struct nvmem_device *nvmem, int index) +{ + struct nvmem_cell *cell = NULL; + int i = 0; + + mutex_lock(&nvmem_mutex); + list_for_each_entry(cell, &nvmem->cells, node) { + if (index == i++) + break; + } + mutex_unlock(&nvmem_mutex); + + return cell; +} + /** * of_nvmem_cell_get() - Get a nvmem cell from given device node and cell id * * @np: Device tree node that uses the nvmem cell. - * @name: nvmem cell name from nvmem-cell-names property, or NULL - * for the cell at index 0 (the lone cell with no accompanying - * nvmem-cell-names property). + * @id: nvmem cell name from nvmem-cell-names property, or NULL + * for the cell at index 0 (the lone cell with no accompanying + * nvmem-cell-names property). * * Return: Will be an ERR_PTR() on error or a valid pointer * to a struct nvmem_cell. The nvmem_cell will be freed by the * nvmem_cell_put(). */ -struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, - const char *name) +struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id) { struct device_node *cell_np, *nvmem_np; - struct nvmem_cell *cell; struct nvmem_device *nvmem; - const __be32 *addr; - int rval, len; + struct nvmem_cell *cell; int index = 0; /* if cell name exists, find index to the name */ - if (name) - index = of_property_match_string(np, "nvmem-cell-names", name); + if (id) + index = of_property_match_string(np, "nvmem-cell-names", id); cell_np = of_parse_phandle(np, "nvmem-cells", index); if (!cell_np) @@ -857,59 +1006,18 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, if (!nvmem_np) return ERR_PTR(-EINVAL); - nvmem = __nvmem_device_get(nvmem_np, NULL, NULL); + nvmem = __nvmem_device_get(nvmem_np, NULL); of_node_put(nvmem_np); if (IS_ERR(nvmem)) return ERR_CAST(nvmem); - addr = of_get_property(cell_np, "reg", &len); - if (!addr || (len < 2 * sizeof(u32))) { - dev_err(&nvmem->dev, "nvmem: invalid reg on %pOF\n", - cell_np); - rval = -EINVAL; - goto err_mem; - } - - cell = kzalloc(sizeof(*cell), GFP_KERNEL); + cell = nvmem_find_cell_by_index(nvmem, index); if (!cell) { - rval = -ENOMEM; - goto err_mem; - } - - cell->nvmem = nvmem; - cell->offset = be32_to_cpup(addr++); - cell->bytes = be32_to_cpup(addr); - cell->name = cell_np->name; - - addr = of_get_property(cell_np, "bits", &len); - if (addr && len == (2 * sizeof(u32))) { - cell->bit_offset = be32_to_cpup(addr++); - cell->nbits = be32_to_cpup(addr); + __nvmem_device_put(nvmem); + return ERR_PTR(-ENOENT); } - if (cell->nbits) - cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset, - BITS_PER_BYTE); - - if (!IS_ALIGNED(cell->offset, nvmem->stride)) { - dev_err(&nvmem->dev, - "cell %s unaligned to nvmem stride %d\n", - cell->name, nvmem->stride); - rval = -EINVAL; - goto err_sanity; - } - - nvmem_cell_add(cell); - return cell; - -err_sanity: - kfree(cell); - -err_mem: - __nvmem_device_put(nvmem); - - return ERR_PTR(rval); } EXPORT_SYMBOL_GPL(of_nvmem_cell_get); #endif @@ -918,27 +1026,29 @@ EXPORT_SYMBOL_GPL(of_nvmem_cell_get); * nvmem_cell_get() - Get nvmem cell of device form a given cell name * * @dev: Device that requests the nvmem cell. - * @cell_id: nvmem cell name to get. + * @id: nvmem cell name to get (this corresponds with the name from the + * nvmem-cell-names property for DT systems and with the con_id from + * the lookup entry for non-DT systems). * * Return: Will be an ERR_PTR() on error or a valid pointer * to a struct nvmem_cell. The nvmem_cell will be freed by the * nvmem_cell_put(). */ -struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *cell_id) +struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id) { struct nvmem_cell *cell; if (dev->of_node) { /* try dt first */ - cell = of_nvmem_cell_get(dev->of_node, cell_id); + cell = of_nvmem_cell_get(dev->of_node, id); if (!IS_ERR(cell) || PTR_ERR(cell) == -EPROBE_DEFER) return cell; } - /* NULL cell_id only allowed for device tree; invalid otherwise */ - if (!cell_id) + /* NULL cell id only allowed for device tree; invalid otherwise */ + if (!id) return ERR_PTR(-EINVAL); - return nvmem_cell_get_from_list(cell_id); + return nvmem_cell_get_from_lookup(dev, id); } EXPORT_SYMBOL_GPL(nvmem_cell_get); @@ -1015,7 +1125,6 @@ void nvmem_cell_put(struct nvmem_cell *cell) struct nvmem_device *nvmem = cell->nvmem; __nvmem_device_put(nvmem); - nvmem_cell_drop(cell); } EXPORT_SYMBOL_GPL(nvmem_cell_put); @@ -1267,7 +1376,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_cell_read); * @buf: buffer to be written to cell. * * Return: length of bytes written or negative error code on failure. - * */ + */ int nvmem_device_cell_write(struct nvmem_device *nvmem, struct nvmem_cell_info *info, void *buf) { @@ -1323,7 +1432,7 @@ EXPORT_SYMBOL_GPL(nvmem_device_read); * @buf: buffer to be written. * * Return: length of bytes written or negative error code on failure. - * */ + */ int nvmem_device_write(struct nvmem_device *nvmem, unsigned int offset, size_t bytes, void *buf) @@ -1343,6 +1452,80 @@ int nvmem_device_write(struct nvmem_device *nvmem, } EXPORT_SYMBOL_GPL(nvmem_device_write); +/** + * nvmem_add_cell_table() - register a table of cell info entries + * + * @table: table of cell info entries + */ +void nvmem_add_cell_table(struct nvmem_cell_table *table) +{ + mutex_lock(&nvmem_cell_mutex); + list_add_tail(&table->node, &nvmem_cell_tables); + mutex_unlock(&nvmem_cell_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_add_cell_table); + +/** + * nvmem_del_cell_table() - remove a previously registered cell info table + * + * @table: table of cell info entries + */ +void nvmem_del_cell_table(struct nvmem_cell_table *table) +{ + mutex_lock(&nvmem_cell_mutex); + list_del(&table->node); + mutex_unlock(&nvmem_cell_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_del_cell_table); + +/** + * nvmem_add_cell_lookups() - register a list of cell lookup entries + * + * @entries: array of cell lookup entries + * @nentries: number of cell lookup entries in the array + */ +void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) +{ + int i; + + mutex_lock(&nvmem_lookup_mutex); + for (i = 0; i < nentries; i++) + list_add_tail(&entries[i].node, &nvmem_lookup_list); + mutex_unlock(&nvmem_lookup_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_add_cell_lookups); + +/** + * nvmem_del_cell_lookups() - remove a list of previously added cell lookup + * entries + * + * @entries: array of cell lookup entries + * @nentries: number of cell lookup entries in the array + */ +void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries, size_t nentries) +{ + int i; + + mutex_lock(&nvmem_lookup_mutex); + for (i = 0; i < nentries; i++) + list_del(&entries[i].node); + mutex_unlock(&nvmem_lookup_mutex); +} +EXPORT_SYMBOL_GPL(nvmem_del_cell_lookups); + +/** + * nvmem_dev_name() - Get the name of a given nvmem device. + * + * @nvmem: nvmem device. + * + * Return: name of the nvmem device. + */ +const char *nvmem_dev_name(struct nvmem_device *nvmem) +{ + return dev_name(&nvmem->dev); +} +EXPORT_SYMBOL_GPL(nvmem_dev_name); + static int __init nvmem_init(void) { return bus_register(&nvmem_bus_type); diff --git a/drivers/nvmem/lpc18xx_eeprom.c b/drivers/nvmem/lpc18xx_eeprom.c @@ -236,7 +236,7 @@ static int lpc18xx_eeprom_probe(struct platform_device *pdev) lpc18xx_nvmem_config.dev = dev; lpc18xx_nvmem_config.priv = eeprom; - eeprom->nvmem = nvmem_register(&lpc18xx_nvmem_config); + eeprom->nvmem = devm_nvmem_register(dev, &lpc18xx_nvmem_config); if (IS_ERR(eeprom->nvmem)) { ret = PTR_ERR(eeprom->nvmem); goto err_clk; @@ -255,11 +255,6 @@ err_clk: static int lpc18xx_eeprom_remove(struct platform_device *pdev) { struct lpc18xx_eeprom_dev *eeprom = platform_get_drvdata(pdev); - int ret; - - ret = nvmem_unregister(eeprom->nvmem); - if (ret < 0) - return ret; clk_disable_unprepare(eeprom->clk); diff --git a/drivers/nvmem/mxs-ocotp.c b/drivers/nvmem/mxs-ocotp.c @@ -177,7 +177,7 @@ static int mxs_ocotp_probe(struct platform_device *pdev) ocotp_config.size = data->size; ocotp_config.priv = otp; ocotp_config.dev = dev; - otp->nvmem = nvmem_register(&ocotp_config); + otp->nvmem = devm_nvmem_register(dev, &ocotp_config); if (IS_ERR(otp->nvmem)) { ret = PTR_ERR(otp->nvmem); goto err_clk; @@ -199,7 +199,7 @@ static int mxs_ocotp_remove(struct platform_device *pdev) clk_unprepare(otp->clk); - return nvmem_unregister(otp->nvmem); + return 0; } static struct platform_driver mxs_ocotp_driver = { diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c @@ -154,7 +154,7 @@ static int sunxi_sid_probe(struct platform_device *pdev) struct resource *res; struct nvmem_device *nvmem; struct sunxi_sid *sid; - int ret, i, size; + int i, size; char *randomness; const struct sunxi_sid_cfg *cfg; @@ -181,15 +181,13 @@ static int sunxi_sid_probe(struct platform_device *pdev) else econfig.reg_read = sunxi_sid_read; econfig.priv = sid; - nvmem = nvmem_register(&econfig); + nvmem = devm_nvmem_register(dev, &econfig); if (IS_ERR(nvmem)) return PTR_ERR(nvmem); randomness = kzalloc(size, GFP_KERNEL); - if (!randomness) { - ret = -EINVAL; - goto err_unreg_nvmem; - } + if (!randomness) + return -ENOMEM; for (i = 0; i < size; i++) econfig.reg_read(sid, i, &randomness[i], 1); @@ -200,17 +198,6 @@ static int sunxi_sid_probe(struct platform_device *pdev) platform_set_drvdata(pdev, nvmem); return 0; - -err_unreg_nvmem: - nvmem_unregister(nvmem); - return ret; -} - -static int sunxi_sid_remove(struct platform_device *pdev) -{ - struct nvmem_device *nvmem = platform_get_drvdata(pdev); - - return nvmem_unregister(nvmem); } static const struct sunxi_sid_cfg sun4i_a10_cfg = { @@ -243,7 +230,6 @@ MODULE_DEVICE_TABLE(of, sunxi_sid_of_match); static struct platform_driver sunxi_sid_driver = { .probe = sunxi_sid_probe, - .remove = sunxi_sid_remove, .driver = { .name = "eeprom-sunxi-sid", .of_match_table = sunxi_sid_of_match, diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2012 Intel, Inc. * Copyright (C) 2013 Intel, Inc. @@ -46,7 +47,6 @@ * exchange is properly mapped during a transfer. */ - #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/interrupt.h> @@ -59,10 +59,11 @@ #include <linux/bitops.h> #include <linux/slab.h> #include <linux/io.h> -#include <linux/goldfish.h> #include <linux/dma-mapping.h> #include <linux/mm.h> #include <linux/acpi.h> +#include <linux/bug.h> +#include "goldfish_pipe_qemu.h" /* * Update this when something changes in the driver's behavior so the host @@ -73,71 +74,6 @@ enum { PIPE_CURRENT_DEVICE_VERSION = 2 }; -/* - * IMPORTANT: The following constants must match the ones used and defined - * in external/qemu/hw/goldfish_pipe.c in the Android source tree. - */ - -/* List of bitflags returned in status of CMD_POLL command */ -enum PipePollFlags { - PIPE_POLL_IN = 1 << 0, - PIPE_POLL_OUT = 1 << 1, - PIPE_POLL_HUP = 1 << 2 -}; - -/* Possible status values used to signal errors - see goldfish_pipe_error_convert */ -enum PipeErrors { - PIPE_ERROR_INVAL = -1, - PIPE_ERROR_AGAIN = -2, - PIPE_ERROR_NOMEM = -3, - PIPE_ERROR_IO = -4 -}; - -/* Bit-flags used to signal events from the emulator */ -enum PipeWakeFlags { - PIPE_WAKE_CLOSED = 1 << 0, /* emulator closed pipe */ - PIPE_WAKE_READ = 1 << 1, /* pipe can now be read from */ - PIPE_WAKE_WRITE = 1 << 2 /* pipe can now be written to */ -}; - -/* Bit flags for the 'flags' field */ -enum PipeFlagsBits { - BIT_CLOSED_ON_HOST = 0, /* pipe closed by host */ - BIT_WAKE_ON_WRITE = 1, /* want to be woken on writes */ - BIT_WAKE_ON_READ = 2, /* want to be woken on reads */ -}; - -enum PipeRegs { - PIPE_REG_CMD = 0, - - PIPE_REG_SIGNAL_BUFFER_HIGH = 4, - PIPE_REG_SIGNAL_BUFFER = 8, - PIPE_REG_SIGNAL_BUFFER_COUNT = 12, - - PIPE_REG_OPEN_BUFFER_HIGH = 20, - PIPE_REG_OPEN_BUFFER = 24, - - PIPE_REG_VERSION = 36, - - PIPE_REG_GET_SIGNALLED = 48, -}; - -enum PipeCmdCode { - PIPE_CMD_OPEN = 1, /* to be used by the pipe device itself */ - PIPE_CMD_CLOSE, - PIPE_CMD_POLL, - PIPE_CMD_WRITE, - PIPE_CMD_WAKE_ON_WRITE, - PIPE_CMD_READ, - PIPE_CMD_WAKE_ON_READ, - - /* - * TODO(zyy): implement a deferred read/write execution to allow - * parallel processing of pipe operations on the host. - */ - PIPE_CMD_WAKE_ON_DONE_IO, -}; - enum { MAX_BUFFERS_PER_COMMAND = 336, MAX_SIGNALLED_PIPES = 64, @@ -145,14 +81,12 @@ enum { }; struct goldfish_pipe_dev; -struct goldfish_pipe; -struct goldfish_pipe_command; /* A per-pipe command structure, shared with the host */ struct goldfish_pipe_command { - s32 cmd; /* PipeCmdCode, guest -> host */ - s32 id; /* pipe id, guest -> host */ - s32 status; /* command execution status, host -> guest */ + s32 cmd; /* PipeCmdCode, guest -> host */ + s32 id; /* pipe id, guest -> host */ + s32 status; /* command execution status, host -> guest */ s32 reserved; /* to pad to 64-bit boundary */ union { /* Parameters for PIPE_CMD_{READ,WRITE} */ @@ -184,19 +118,21 @@ struct open_command_param { /* Device-level set of buffers shared with the host */ struct goldfish_pipe_dev_buffers { struct open_command_param open_command_params; - struct signalled_pipe_buffer signalled_pipe_buffers[ - MAX_SIGNALLED_PIPES]; + struct signalled_pipe_buffer + signalled_pipe_buffers[MAX_SIGNALLED_PIPES]; }; /* This data type models a given pipe instance */ struct goldfish_pipe { /* pipe ID - index into goldfish_pipe_dev::pipes array */ u32 id; + /* The wake flags pipe is waiting for * Note: not protected with any lock, uses atomic operations * and barriers to make it thread-safe. */ unsigned long flags; + /* wake flags host have signalled, * - protected by goldfish_pipe_dev::lock */ @@ -220,8 +156,12 @@ struct goldfish_pipe { /* A wake queue for sleeping until host signals an event */ wait_queue_head_t wake_queue; + /* Pointer to the parent goldfish_pipe_dev instance */ struct goldfish_pipe_dev *dev; + + /* A buffer of pages, too large to fit into a stack frame */ + struct page *pages[MAX_BUFFERS_PER_COMMAND]; }; /* The global driver data. Holds a reference to the i/o page used to @@ -229,6 +169,9 @@ struct goldfish_pipe { * waiting to be awoken. */ struct goldfish_pipe_dev { + /* A magic number to check if this is an instance of this struct */ + void *magic; + /* * Global device spinlock. Protects the following members: * - pipes, pipes_capacity @@ -261,15 +204,22 @@ struct goldfish_pipe_dev { /* Head of a doubly linked list of signalled pipes */ struct goldfish_pipe *first_signalled_pipe; + /* ptr to platform device's device struct */ + struct device *pdev_dev; + /* Some device-specific data */ int irq; int version; unsigned char __iomem *base; -}; -static struct goldfish_pipe_dev pipe_dev[1] = {}; + /* an irq tasklet to run goldfish_interrupt_task */ + struct tasklet_struct irq_tasklet; -static int goldfish_cmd_locked(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) + struct miscdevice miscdev; +}; + +static int goldfish_pipe_cmd_locked(struct goldfish_pipe *pipe, + enum PipeCmdCode cmd) { pipe->command_buffer->cmd = cmd; /* failure by default */ @@ -278,13 +228,13 @@ static int goldfish_cmd_locked(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) return pipe->command_buffer->status; } -static int goldfish_cmd(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) +static int goldfish_pipe_cmd(struct goldfish_pipe *pipe, enum PipeCmdCode cmd) { int status; if (mutex_lock_interruptible(&pipe->lock)) return PIPE_ERROR_IO; - status = goldfish_cmd_locked(pipe, cmd); + status = goldfish_pipe_cmd_locked(pipe, cmd); mutex_unlock(&pipe->lock); return status; } @@ -307,10 +257,12 @@ static int goldfish_pipe_error_convert(int status) } } -static int pin_user_pages(unsigned long first_page, unsigned long last_page, - unsigned int last_page_size, int is_write, - struct page *pages[MAX_BUFFERS_PER_COMMAND], - unsigned int *iter_last_page_size) +static int pin_user_pages(unsigned long first_page, + unsigned long last_page, + unsigned int last_page_size, + int is_write, + struct page *pages[MAX_BUFFERS_PER_COMMAND], + unsigned int *iter_last_page_size) { int ret; int requested_pages = ((last_page - first_page) >> PAGE_SHIFT) + 1; @@ -322,18 +274,18 @@ static int pin_user_pages(unsigned long first_page, unsigned long last_page, *iter_last_page_size = last_page_size; } - ret = get_user_pages_fast( - first_page, requested_pages, !is_write, pages); + ret = get_user_pages_fast(first_page, requested_pages, !is_write, + pages); if (ret <= 0) return -EFAULT; if (ret < requested_pages) *iter_last_page_size = PAGE_SIZE; - return ret; + return ret; } static void release_user_pages(struct page **pages, int pages_count, - int is_write, s32 consumed_size) + int is_write, s32 consumed_size) { int i; @@ -345,12 +297,15 @@ static void release_user_pages(struct page **pages, int pages_count, } /* Populate the call parameters, merging adjacent pages together */ -static void populate_rw_params( - struct page **pages, int pages_count, - unsigned long address, unsigned long address_end, - unsigned long first_page, unsigned long last_page, - unsigned int iter_last_page_size, int is_write, - struct goldfish_pipe_command *command) +static void populate_rw_params(struct page **pages, + int pages_count, + unsigned long address, + unsigned long address_end, + unsigned long first_page, + unsigned long last_page, + unsigned int iter_last_page_size, + int is_write, + struct goldfish_pipe_command *command) { /* * Process the first page separately - it's the only page that @@ -382,55 +337,59 @@ static void populate_rw_params( } static int transfer_max_buffers(struct goldfish_pipe *pipe, - unsigned long address, unsigned long address_end, int is_write, - unsigned long last_page, unsigned int last_page_size, - s32 *consumed_size, int *status) + unsigned long address, + unsigned long address_end, + int is_write, + unsigned long last_page, + unsigned int last_page_size, + s32 *consumed_size, + int *status) { - static struct page *pages[MAX_BUFFERS_PER_COMMAND]; unsigned long first_page = address & PAGE_MASK; unsigned int iter_last_page_size; - int pages_count = pin_user_pages(first_page, last_page, - last_page_size, is_write, - pages, &iter_last_page_size); - - if (pages_count < 0) - return pages_count; + int pages_count; /* Serialize access to the pipe command buffers */ if (mutex_lock_interruptible(&pipe->lock)) return -ERESTARTSYS; - populate_rw_params(pages, pages_count, address, address_end, - first_page, last_page, iter_last_page_size, is_write, - pipe->command_buffer); + pages_count = pin_user_pages(first_page, last_page, + last_page_size, is_write, + pipe->pages, &iter_last_page_size); + if (pages_count < 0) { + mutex_unlock(&pipe->lock); + return pages_count; + } + + populate_rw_params(pipe->pages, pages_count, address, address_end, + first_page, last_page, iter_last_page_size, is_write, + pipe->command_buffer); /* Transfer the data */ - *status = goldfish_cmd_locked(pipe, + *status = goldfish_pipe_cmd_locked(pipe, is_write ? PIPE_CMD_WRITE : PIPE_CMD_READ); *consumed_size = pipe->command_buffer->rw_params.consumed_size; - release_user_pages(pages, pages_count, is_write, *consumed_size); + release_user_pages(pipe->pages, pages_count, is_write, *consumed_size); mutex_unlock(&pipe->lock); - return 0; } static int wait_for_host_signal(struct goldfish_pipe *pipe, int is_write) { - u32 wakeBit = is_write ? BIT_WAKE_ON_WRITE : BIT_WAKE_ON_READ; + u32 wake_bit = is_write ? BIT_WAKE_ON_WRITE : BIT_WAKE_ON_READ; - set_bit(wakeBit, &pipe->flags); + set_bit(wake_bit, &pipe->flags); /* Tell the emulator we're going to wait for a wake event */ - (void)goldfish_cmd(pipe, + goldfish_pipe_cmd(pipe, is_write ? PIPE_CMD_WAKE_ON_WRITE : PIPE_CMD_WAKE_ON_READ); - while (test_bit(wakeBit, &pipe->flags)) { - if (wait_event_interruptible( - pipe->wake_queue, - !test_bit(wakeBit, &pipe->flags))) + while (test_bit(wake_bit, &pipe->flags)) { + if (wait_event_interruptible(pipe->wake_queue, + !test_bit(wake_bit, &pipe->flags))) return -ERESTARTSYS; if (test_bit(BIT_CLOSED_ON_HOST, &pipe->flags)) @@ -441,7 +400,9 @@ static int wait_for_host_signal(struct goldfish_pipe *pipe, int is_write) } static ssize_t goldfish_pipe_read_write(struct file *filp, - char __user *buffer, size_t bufflen, int is_write) + char __user *buffer, + size_t bufflen, + int is_write) { struct goldfish_pipe *pipe = filp->private_data; int count = 0, ret = -EINVAL; @@ -456,7 +417,7 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, return 0; /* Check the buffer range for access */ if (unlikely(!access_ok(is_write ? VERIFY_WRITE : VERIFY_READ, - buffer, bufflen))) + buffer, bufflen))) return -EFAULT; address = (unsigned long)buffer; @@ -469,8 +430,8 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, int status; ret = transfer_max_buffers(pipe, address, address_end, is_write, - last_page, last_page_size, &consumed_size, - &status); + last_page, last_page_size, + &consumed_size, &status); if (ret < 0) break; @@ -496,7 +457,8 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, * err. */ if (status != PIPE_ERROR_AGAIN) - pr_info_ratelimited("goldfish_pipe: backend error %d on %s\n", + dev_err_ratelimited(pipe->dev->pdev_dev, + "backend error %d on %s\n", status, is_write ? "write" : "read"); break; } @@ -522,19 +484,21 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, } static ssize_t goldfish_pipe_read(struct file *filp, char __user *buffer, - size_t bufflen, loff_t *ppos) + size_t bufflen, loff_t *ppos) { return goldfish_pipe_read_write(filp, buffer, bufflen, - /* is_write */ 0); + /* is_write */ 0); } static ssize_t goldfish_pipe_write(struct file *filp, - const char __user *buffer, size_t bufflen, - loff_t *ppos) + const char __user *buffer, size_t bufflen, + loff_t *ppos) { - return goldfish_pipe_read_write(filp, - /* cast away the const */(char __user *)buffer, bufflen, - /* is_write */ 1); + /* cast away the const */ + char __user *no_const_buffer = (char __user *)buffer; + + return goldfish_pipe_read_write(filp, no_const_buffer, bufflen, + /* is_write */ 1); } static __poll_t goldfish_pipe_poll(struct file *filp, poll_table *wait) @@ -545,7 +509,7 @@ static __poll_t goldfish_pipe_poll(struct file *filp, poll_table *wait) poll_wait(filp, &pipe->wake_queue, wait); - status = goldfish_cmd(pipe, PIPE_CMD_POLL); + status = goldfish_pipe_cmd(pipe, PIPE_CMD_POLL); if (status < 0) return -ERESTARTSYS; @@ -562,7 +526,7 @@ static __poll_t goldfish_pipe_poll(struct file *filp, poll_table *wait) } static void signalled_pipes_add_locked(struct goldfish_pipe_dev *dev, - u32 id, u32 flags) + u32 id, u32 flags) { struct goldfish_pipe *pipe; @@ -574,8 +538,8 @@ static void signalled_pipes_add_locked(struct goldfish_pipe_dev *dev, return; pipe->signalled_flags |= flags; - if (pipe->prev_signalled || pipe->next_signalled - || dev->first_signalled_pipe == pipe) + if (pipe->prev_signalled || pipe->next_signalled || + dev->first_signalled_pipe == pipe) return; /* already in the list */ pipe->next_signalled = dev->first_signalled_pipe; if (dev->first_signalled_pipe) @@ -584,7 +548,8 @@ static void signalled_pipes_add_locked(struct goldfish_pipe_dev *dev, } static void signalled_pipes_remove_locked(struct goldfish_pipe_dev *dev, - struct goldfish_pipe *pipe) { + struct goldfish_pipe *pipe) +{ if (pipe->prev_signalled) pipe->prev_signalled->next_signalled = pipe->next_signalled; if (pipe->next_signalled) @@ -623,10 +588,10 @@ static struct goldfish_pipe *signalled_pipes_pop_front( return pipe; } -static void goldfish_interrupt_task(unsigned long unused) +static void goldfish_interrupt_task(unsigned long dev_addr) { - struct goldfish_pipe_dev *dev = pipe_dev; /* Iterate over the signalled pipes and wake them one by one */ + struct goldfish_pipe_dev *dev = (struct goldfish_pipe_dev *)dev_addr; struct goldfish_pipe *pipe; int wakes; @@ -646,7 +611,9 @@ static void goldfish_interrupt_task(unsigned long unused) wake_up_interruptible(&pipe->wake_queue); } } -static DECLARE_TASKLET(goldfish_interrupt_tasklet, goldfish_interrupt_task, 0); + +static void goldfish_pipe_device_deinit(struct platform_device *pdev, + struct goldfish_pipe_dev *dev); /* * The general idea of the interrupt handling: @@ -668,7 +635,7 @@ static irqreturn_t goldfish_pipe_interrupt(int irq, void *dev_id) unsigned long flags; struct goldfish_pipe_dev *dev = dev_id; - if (dev != pipe_dev) + if (dev->magic != &goldfish_pipe_device_deinit) return IRQ_NONE; /* Request the signalled pipes from the device */ @@ -689,7 +656,7 @@ static irqreturn_t goldfish_pipe_interrupt(int irq, void *dev_id) spin_unlock_irqrestore(&dev->lock, flags); - tasklet_schedule(&goldfish_interrupt_tasklet); + tasklet_schedule(&dev->irq_tasklet); return IRQ_HANDLED; } @@ -702,7 +669,10 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev) return id; { - /* Reallocate the array */ + /* Reallocate the array. + * Since get_free_pipe_id_locked runs with interrupts disabled, + * we don't want to make calls that could lead to sleep. + */ u32 new_capacity = 2 * dev->pipes_capacity; struct goldfish_pipe **pipes = kcalloc(new_capacity, sizeof(*pipes), GFP_ATOMIC); @@ -717,6 +687,14 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev) return id; } +/* A helper function to get the instance of goldfish_pipe_dev from file */ +static struct goldfish_pipe_dev *to_goldfish_pipe_dev(struct file *file) +{ + struct miscdevice *miscdev = file->private_data; + + return container_of(miscdev, struct goldfish_pipe_dev, miscdev); +} + /** * goldfish_pipe_open - open a channel to the AVD * @inode: inode of device @@ -730,14 +708,15 @@ static int get_free_pipe_id_locked(struct goldfish_pipe_dev *dev) */ static int goldfish_pipe_open(struct inode *inode, struct file *file) { - struct goldfish_pipe_dev *dev = pipe_dev; + struct goldfish_pipe_dev *dev = to_goldfish_pipe_dev(file); unsigned long flags; int id; int status; /* Allocate new pipe kernel object */ struct goldfish_pipe *pipe = kzalloc(sizeof(*pipe), GFP_KERNEL); - if (pipe == NULL) + + if (!pipe) return -ENOMEM; pipe->dev = dev; @@ -748,6 +727,7 @@ static int goldfish_pipe_open(struct inode *inode, struct file *file) * Command buffer needs to be allocated on its own page to make sure * it is physically contiguous in host's address space. */ + BUILD_BUG_ON(sizeof(struct goldfish_pipe_command) > PAGE_SIZE); pipe->command_buffer = (struct goldfish_pipe_command *)__get_free_page(GFP_KERNEL); if (!pipe->command_buffer) { @@ -772,7 +752,7 @@ static int goldfish_pipe_open(struct inode *inode, struct file *file) MAX_BUFFERS_PER_COMMAND; dev->buffers->open_command_params.command_buffer_ptr = (u64)(unsigned long)__pa(pipe->command_buffer); - status = goldfish_cmd_locked(pipe, PIPE_CMD_OPEN); + status = goldfish_pipe_cmd_locked(pipe, PIPE_CMD_OPEN); spin_unlock_irqrestore(&dev->lock, flags); if (status < 0) goto err_cmd; @@ -798,7 +778,7 @@ static int goldfish_pipe_release(struct inode *inode, struct file *filp) struct goldfish_pipe_dev *dev = pipe->dev; /* The guest is closing the channel, so tell the emulator right now */ - (void)goldfish_cmd(pipe, PIPE_CMD_CLOSE); + goldfish_pipe_cmd(pipe, PIPE_CMD_CLOSE); spin_lock_irqsave(&dev->lock, flags); dev->pipes[pipe->id] = NULL; @@ -820,36 +800,55 @@ static const struct file_operations goldfish_pipe_fops = { .release = goldfish_pipe_release, }; -static struct miscdevice goldfish_pipe_dev = { - .minor = MISC_DYNAMIC_MINOR, - .name = "goldfish_pipe", - .fops = &goldfish_pipe_fops, -}; +static void init_miscdevice(struct miscdevice *miscdev) +{ + memset(miscdev, 0, sizeof(*miscdev)); + + miscdev->minor = MISC_DYNAMIC_MINOR; + miscdev->name = "goldfish_pipe"; + miscdev->fops = &goldfish_pipe_fops; +} + +static void write_pa_addr(void *addr, void __iomem *portl, void __iomem *porth) +{ + const unsigned long paddr = __pa(addr); + + writel(upper_32_bits(paddr), porth); + writel(lower_32_bits(paddr), portl); +} -static int goldfish_pipe_device_init(struct platform_device *pdev) +static int goldfish_pipe_device_init(struct platform_device *pdev, + struct goldfish_pipe_dev *dev) { - char *page; - struct goldfish_pipe_dev *dev = pipe_dev; - int err = devm_request_irq(&pdev->dev, dev->irq, - goldfish_pipe_interrupt, - IRQF_SHARED, "goldfish_pipe", dev); + int err; + + tasklet_init(&dev->irq_tasklet, &goldfish_interrupt_task, + (unsigned long)dev); + + err = devm_request_irq(&pdev->dev, dev->irq, + goldfish_pipe_interrupt, + IRQF_SHARED, "goldfish_pipe", dev); if (err) { dev_err(&pdev->dev, "unable to allocate IRQ for v2\n"); return err; } - err = misc_register(&goldfish_pipe_dev); + init_miscdevice(&dev->miscdev); + err = misc_register(&dev->miscdev); if (err) { dev_err(&pdev->dev, "unable to register v2 device\n"); return err; } + dev->pdev_dev = &pdev->dev; dev->first_signalled_pipe = NULL; dev->pipes_capacity = INITIAL_PIPES_CAPACITY; dev->pipes = kcalloc(dev->pipes_capacity, sizeof(*dev->pipes), - GFP_KERNEL); - if (!dev->pipes) + GFP_KERNEL); + if (!dev->pipes) { + misc_deregister(&dev->miscdev); return -ENOMEM; + } /* * We're going to pass two buffers, open_command_params and @@ -857,75 +856,67 @@ static int goldfish_pipe_device_init(struct platform_device *pdev) * needs to be contained in a single physical page. The easiest choice * is to just allocate a page and place the buffers in it. */ - if (WARN_ON(sizeof(*dev->buffers) > PAGE_SIZE)) - return -ENOMEM; - - page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { + BUILD_BUG_ON(sizeof(struct goldfish_pipe_dev_buffers) > PAGE_SIZE); + dev->buffers = (struct goldfish_pipe_dev_buffers *) + __get_free_page(GFP_KERNEL); + if (!dev->buffers) { kfree(dev->pipes); + misc_deregister(&dev->miscdev); return -ENOMEM; } - dev->buffers = (struct goldfish_pipe_dev_buffers *)page; /* Send the buffer addresses to the host */ - { - u64 paddr = __pa(&dev->buffers->signalled_pipe_buffers); - - writel((u32)(unsigned long)(paddr >> 32), - dev->base + PIPE_REG_SIGNAL_BUFFER_HIGH); - writel((u32)(unsigned long)paddr, - dev->base + PIPE_REG_SIGNAL_BUFFER); - writel((u32)MAX_SIGNALLED_PIPES, - dev->base + PIPE_REG_SIGNAL_BUFFER_COUNT); - - paddr = __pa(&dev->buffers->open_command_params); - writel((u32)(unsigned long)(paddr >> 32), - dev->base + PIPE_REG_OPEN_BUFFER_HIGH); - writel((u32)(unsigned long)paddr, - dev->base + PIPE_REG_OPEN_BUFFER); - } + write_pa_addr(&dev->buffers->signalled_pipe_buffers, + dev->base + PIPE_REG_SIGNAL_BUFFER, + dev->base + PIPE_REG_SIGNAL_BUFFER_HIGH); + + writel(MAX_SIGNALLED_PIPES, + dev->base + PIPE_REG_SIGNAL_BUFFER_COUNT); + + write_pa_addr(&dev->buffers->open_command_params, + dev->base + PIPE_REG_OPEN_BUFFER, + dev->base + PIPE_REG_OPEN_BUFFER_HIGH); + + platform_set_drvdata(pdev, dev); return 0; } -static void goldfish_pipe_device_deinit(struct platform_device *pdev) +static void goldfish_pipe_device_deinit(struct platform_device *pdev, + struct goldfish_pipe_dev *dev) { - struct goldfish_pipe_dev *dev = pipe_dev; - - misc_deregister(&goldfish_pipe_dev); + misc_deregister(&dev->miscdev); + tasklet_kill(&dev->irq_tasklet); kfree(dev->pipes); free_page((unsigned long)dev->buffers); } static int goldfish_pipe_probe(struct platform_device *pdev) { - int err; struct resource *r; - struct goldfish_pipe_dev *dev = pipe_dev; + struct goldfish_pipe_dev *dev; - if (WARN_ON(sizeof(struct goldfish_pipe_command) > PAGE_SIZE)) + dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) return -ENOMEM; - /* not thread safe, but this should not happen */ - WARN_ON(dev->base != NULL); - + dev->magic = &goldfish_pipe_device_deinit; spin_lock_init(&dev->lock); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (r == NULL || resource_size(r) < PAGE_SIZE) { + if (!r || resource_size(r) < PAGE_SIZE) { dev_err(&pdev->dev, "can't allocate i/o page\n"); return -EINVAL; } dev->base = devm_ioremap(&pdev->dev, r->start, PAGE_SIZE); - if (dev->base == NULL) { + if (!dev->base) { dev_err(&pdev->dev, "ioremap failed\n"); return -EINVAL; } r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (r == NULL) { - err = -EINVAL; - goto error; - } + if (!r) + return -EINVAL; + dev->irq = r->start; /* @@ -935,25 +926,19 @@ static int goldfish_pipe_probe(struct platform_device *pdev) * reading device version back: this allows the host implementation to * detect the old driver (if there was no version write before read). */ - writel((u32)PIPE_DRIVER_VERSION, dev->base + PIPE_REG_VERSION); + writel(PIPE_DRIVER_VERSION, dev->base + PIPE_REG_VERSION); dev->version = readl(dev->base + PIPE_REG_VERSION); if (WARN_ON(dev->version < PIPE_CURRENT_DEVICE_VERSION)) return -EINVAL; - err = goldfish_pipe_device_init(pdev); - if (!err) - return 0; - -error: - dev->base = NULL; - return err; + return goldfish_pipe_device_init(pdev, dev); } static int goldfish_pipe_remove(struct platform_device *pdev) { - struct goldfish_pipe_dev *dev = pipe_dev; - goldfish_pipe_device_deinit(pdev); - dev->base = NULL; + struct goldfish_pipe_dev *dev = platform_get_drvdata(pdev); + + goldfish_pipe_device_deinit(pdev, dev); return 0; } @@ -981,4 +966,4 @@ static struct platform_driver goldfish_pipe_driver = { module_platform_driver(goldfish_pipe_driver); MODULE_AUTHOR("David Turner <digit@google.com>"); -MODULE_LICENSE("GPL"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/platform/goldfish/goldfish_pipe_qemu.h b/drivers/platform/goldfish/goldfish_pipe_qemu.h @@ -0,0 +1,98 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * IMPORTANT: The following constants must match the ones used and defined in + * external/qemu/include/hw/misc/goldfish_pipe.h + */ + +#ifndef GOLDFISH_PIPE_QEMU_H +#define GOLDFISH_PIPE_QEMU_H + +/* List of bitflags returned in status of CMD_POLL command */ +enum PipePollFlags { + PIPE_POLL_IN = 1 << 0, + PIPE_POLL_OUT = 1 << 1, + PIPE_POLL_HUP = 1 << 2 +}; + +/* Possible status values used to signal errors */ +enum PipeErrors { + PIPE_ERROR_INVAL = -1, + PIPE_ERROR_AGAIN = -2, + PIPE_ERROR_NOMEM = -3, + PIPE_ERROR_IO = -4 +}; + +/* Bit-flags used to signal events from the emulator */ +enum PipeWakeFlags { + /* emulator closed pipe */ + PIPE_WAKE_CLOSED = 1 << 0, + + /* pipe can now be read from */ + PIPE_WAKE_READ = 1 << 1, + + /* pipe can now be written to */ + PIPE_WAKE_WRITE = 1 << 2, + + /* unlock this pipe's DMA buffer */ + PIPE_WAKE_UNLOCK_DMA = 1 << 3, + + /* unlock DMA buffer of the pipe shared to this pipe */ + PIPE_WAKE_UNLOCK_DMA_SHARED = 1 << 4, +}; + +/* Possible pipe closing reasons */ +enum PipeCloseReason { + /* guest sent a close command */ + PIPE_CLOSE_GRACEFUL = 0, + + /* guest rebooted, we're closing the pipes */ + PIPE_CLOSE_REBOOT = 1, + + /* close old pipes on snapshot load */ + PIPE_CLOSE_LOAD_SNAPSHOT = 2, + + /* some unrecoverable error on the pipe */ + PIPE_CLOSE_ERROR = 3, +}; + +/* Bit flags for the 'flags' field */ +enum PipeFlagsBits { + BIT_CLOSED_ON_HOST = 0, /* pipe closed by host */ + BIT_WAKE_ON_WRITE = 1, /* want to be woken on writes */ + BIT_WAKE_ON_READ = 2, /* want to be woken on reads */ +}; + +enum PipeRegs { + PIPE_REG_CMD = 0, + + PIPE_REG_SIGNAL_BUFFER_HIGH = 4, + PIPE_REG_SIGNAL_BUFFER = 8, + PIPE_REG_SIGNAL_BUFFER_COUNT = 12, + + PIPE_REG_OPEN_BUFFER_HIGH = 20, + PIPE_REG_OPEN_BUFFER = 24, + + PIPE_REG_VERSION = 36, + + PIPE_REG_GET_SIGNALLED = 48, +}; + +enum PipeCmdCode { + /* to be used by the pipe device itself */ + PIPE_CMD_OPEN = 1, + + PIPE_CMD_CLOSE, + PIPE_CMD_POLL, + PIPE_CMD_WRITE, + PIPE_CMD_WAKE_ON_WRITE, + PIPE_CMD_READ, + PIPE_CMD_WAKE_ON_READ, + + /* + * TODO(zyy): implement a deferred read/write execution to allow + * parallel processing of pipe operations on the host. + */ + PIPE_CMD_WAKE_ON_DONE_IO, +}; + +#endif /* GOLDFISH_PIPE_QEMU_H */ diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c @@ -9,6 +9,7 @@ #include <linux/init.h> #include <linux/idr.h> #include <linux/of.h> +#include <linux/of_device.h> #include <linux/pm_runtime.h> #include <linux/slimbus.h> #include "slimbus.h" @@ -32,6 +33,10 @@ static int slim_device_match(struct device *dev, struct device_driver *drv) struct slim_device *sbdev = to_slim_device(dev); struct slim_driver *sbdrv = to_slim_driver(drv); + /* Attempt an OF style match first */ + if (of_driver_match_device(dev, drv)) + return 1; + return !!slim_match(sbdrv->id_table, sbdev); } @@ -39,8 +44,23 @@ static int slim_device_probe(struct device *dev) { struct slim_device *sbdev = to_slim_device(dev); struct slim_driver *sbdrv = to_slim_driver(dev->driver); + int ret; - return sbdrv->probe(sbdev); + ret = sbdrv->probe(sbdev); + if (ret) + return ret; + + /* try getting the logical address after probe */ + ret = slim_get_logical_addr(sbdev); + if (!ret) { + if (sbdrv->device_status) + sbdrv->device_status(sbdev, sbdev->status); + } else { + dev_err(&sbdev->dev, "Failed to get logical address\n"); + ret = -EPROBE_DEFER; + } + + return ret; } static int slim_device_remove(struct device *dev) @@ -57,11 +77,24 @@ static int slim_device_remove(struct device *dev) return 0; } +static int slim_device_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct slim_device *sbdev = to_slim_device(dev); + int ret; + + ret = of_device_uevent_modalias(dev, env); + if (ret != -ENODEV) + return ret; + + return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev)); +} + struct bus_type slimbus_bus = { .name = "slimbus", .match = slim_device_match, .probe = slim_device_probe, .remove = slim_device_remove, + .uevent = slim_device_uevent, }; EXPORT_SYMBOL_GPL(slimbus_bus); @@ -77,7 +110,7 @@ EXPORT_SYMBOL_GPL(slimbus_bus); int __slim_driver_register(struct slim_driver *drv, struct module *owner) { /* ID table and probe are mandatory */ - if (!drv->id_table || !drv->probe) + if (!(drv->driver.of_match_table || drv->id_table) || !drv->probe) return -EINVAL; drv->driver.bus = &slimbus_bus; diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c @@ -1004,6 +1004,7 @@ static int qcom_slim_ngd_get_laddr(struct slim_controller *ctrl, struct slim_eaddr *ea, u8 *laddr) { struct slim_val_inf msg = {0}; + u8 failed_ea[6] = {0, 0, 0, 0, 0, 0}; struct slim_msg_txn txn; u8 wbuf[10] = {0}; u8 rbuf[10] = {0}; @@ -1034,6 +1035,9 @@ static int qcom_slim_ngd_get_laddr(struct slim_controller *ctrl, return ret; } + if (!memcmp(rbuf, failed_ea, 6)) + return -ENXIO; + *laddr = rbuf[6]; return ret; @@ -1234,8 +1238,17 @@ static int qcom_slim_ngd_enable(struct qcom_slim_ngd_ctrl *ctrl, bool enable) pm_runtime_resume(ctrl->dev); pm_runtime_mark_last_busy(ctrl->dev); pm_runtime_put(ctrl->dev); + + ret = slim_register_controller(&ctrl->ctrl); + if (ret) { + dev_err(ctrl->dev, "error adding slim controller\n"); + return ret; + } + + dev_info(ctrl->dev, "SLIM controller Registered\n"); } else { qcom_slim_qmi_exit(ctrl); + slim_unregister_controller(&ctrl->ctrl); } return 0; @@ -1342,7 +1355,6 @@ static int of_qcom_slim_ngd_register(struct device *parent, ngd->base = ctrl->base + ngd->id * data->offset + (ngd->id - 1) * data->size; ctrl->ngd = ngd; - platform_driver_register(&qcom_slim_ngd_driver); return 0; } @@ -1357,11 +1369,6 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev) int ret; ctrl->ctrl.dev = dev; - ret = slim_register_controller(&ctrl->ctrl); - if (ret) { - dev_err(dev, "error adding slim controller\n"); - return ret; - } pm_runtime_use_autosuspend(dev); pm_runtime_set_autosuspend_delay(dev, QCOM_SLIM_NGD_AUTOSUSPEND); @@ -1371,7 +1378,7 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev) ret = qcom_slim_ngd_qmi_svc_event_init(ctrl); if (ret) { dev_err(&pdev->dev, "QMI service registration failed:%d", ret); - goto err; + return ret; } INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker); @@ -1383,14 +1390,12 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev) } return 0; -err: - slim_unregister_controller(&ctrl->ctrl); wq_err: qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi); if (ctrl->mwq) destroy_workqueue(ctrl->mwq); - return 0; + return ret; } static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev) @@ -1441,6 +1446,7 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev) init_completion(&ctrl->reconf); init_completion(&ctrl->qmi.qmi_comp); + platform_driver_register(&qcom_slim_ngd_driver); return of_qcom_slim_ngd_register(dev, ctrl); } @@ -1456,7 +1462,7 @@ static int qcom_slim_ngd_remove(struct platform_device *pdev) struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev); pm_runtime_disable(&pdev->dev); - slim_unregister_controller(&ctrl->ctrl); + qcom_slim_ngd_enable(ctrl, false); qcom_slim_ngd_exit_dma(ctrl); qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi); if (ctrl->mwq) @@ -1467,7 +1473,7 @@ static int qcom_slim_ngd_remove(struct platform_device *pdev) return 0; } -static int qcom_slim_ngd_runtime_idle(struct device *dev) +static int __maybe_unused qcom_slim_ngd_runtime_idle(struct device *dev) { struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev); @@ -1477,8 +1483,7 @@ static int qcom_slim_ngd_runtime_idle(struct device *dev) return -EAGAIN; } -#ifdef CONFIG_PM -static int qcom_slim_ngd_runtime_suspend(struct device *dev) +static int __maybe_unused qcom_slim_ngd_runtime_suspend(struct device *dev) { struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev); int ret = 0; @@ -1491,7 +1496,6 @@ static int qcom_slim_ngd_runtime_suspend(struct device *dev) return ret; } -#endif static const struct dev_pm_ops qcom_slim_ngd_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c @@ -35,6 +35,11 @@ int sdw_add_bus_master(struct sdw_bus *bus) INIT_LIST_HEAD(&bus->slaves); INIT_LIST_HEAD(&bus->m_rt_list); + /* + * Initialize multi_link flag + * TODO: populate this flag by reading property from FW node + */ + bus->multi_link = false; if (bus->ops->read_prop) { ret = bus->ops->read_prop(bus); if (ret < 0) { @@ -175,6 +180,7 @@ static inline int do_transfer_defer(struct sdw_bus *bus, defer->msg = msg; defer->length = msg->len; + init_completion(&defer->complete); for (i = 0; i <= retry; i++) { resp = bus->ops->xfer_msg_defer(bus, msg, defer); diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h @@ -4,6 +4,8 @@ #ifndef __SDW_BUS_H #define __SDW_BUS_H +#define DEFAULT_BANK_SWITCH_TIMEOUT 3000 + #if IS_ENABLED(CONFIG_ACPI) int sdw_acpi_find_slaves(struct sdw_bus *bus); #else @@ -99,6 +101,7 @@ struct sdw_slave_runtime { * this stream, can be zero. * @slave_rt_list: Slave runtime list * @port_list: List of Master Ports configured for this stream, can be zero. + * @stream_node: sdw_stream_runtime master_list node * @bus_node: sdw_bus m_rt_list node */ struct sdw_master_runtime { @@ -108,6 +111,7 @@ struct sdw_master_runtime { unsigned int ch_count; struct list_head slave_rt_list; struct list_head port_list; + struct list_head stream_node; struct list_head bus_node; }; diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c @@ -398,6 +398,69 @@ static int intel_config_stream(struct sdw_intel *sdw, } /* + * bank switch routines + */ + +static int intel_pre_bank_switch(struct sdw_bus *bus) +{ + struct sdw_cdns *cdns = bus_to_cdns(bus); + struct sdw_intel *sdw = cdns_to_intel(cdns); + void __iomem *shim = sdw->res->shim; + int sync_reg; + + /* Write to register only for multi-link */ + if (!bus->multi_link) + return 0; + + /* Read SYNC register */ + sync_reg = intel_readl(shim, SDW_SHIM_SYNC); + sync_reg |= SDW_SHIM_SYNC_CMDSYNC << sdw->instance; + intel_writel(shim, SDW_SHIM_SYNC, sync_reg); + + return 0; +} + +static int intel_post_bank_switch(struct sdw_bus *bus) +{ + struct sdw_cdns *cdns = bus_to_cdns(bus); + struct sdw_intel *sdw = cdns_to_intel(cdns); + void __iomem *shim = sdw->res->shim; + int sync_reg, ret; + + /* Write to register only for multi-link */ + if (!bus->multi_link) + return 0; + + /* Read SYNC register */ + sync_reg = intel_readl(shim, SDW_SHIM_SYNC); + + /* + * post_bank_switch() ops is called from the bus in loop for + * all the Masters in the steam with the expectation that + * we trigger the bankswitch for the only first Master in the list + * and do nothing for the other Masters + * + * So, set the SYNCGO bit only if CMDSYNC bit is set for any Master. + */ + if (!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK)) + return 0; + + /* + * Set SyncGO bit to synchronously trigger a bank switch for + * all the masters. A write to SYNCGO bit clears CMDSYNC bit for all + * the Masters. + */ + sync_reg |= SDW_SHIM_SYNC_SYNCGO; + + ret = intel_clear_bit(shim, SDW_SHIM_SYNC, sync_reg, + SDW_SHIM_SYNC_SYNCGO); + if (ret < 0) + dev_err(sdw->cdns.dev, "Post bank switch failed: %d", ret); + + return ret; +} + +/* * DAI routines */ @@ -750,6 +813,8 @@ static struct sdw_master_ops sdw_intel_ops = { .xfer_msg_defer = cdns_xfer_msg_defer, .reset_page_addr = cdns_reset_page_addr, .set_bus_conf = cdns_bus_conf, + .pre_bank_switch = intel_pre_bank_switch, + .post_bank_switch = intel_post_bank_switch, }; /* @@ -780,9 +845,6 @@ static int intel_probe(struct platform_device *pdev) sdw_intel_ops.read_prop = intel_prop_read; sdw->cdns.bus.ops = &sdw_intel_ops; - sdw_intel_ops.read_prop = intel_prop_read; - sdw->cdns.bus.ops = &sdw_intel_ops; - platform_set_drvdata(pdev, sdw); ret = sdw_add_bus_master(&sdw->cdns.bus); diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c @@ -151,7 +151,7 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, struct acpi_device *adev; if (acpi_bus_get_device(handle, &adev)) { - dev_err(&adev->dev, "Couldn't find ACPI handle\n"); + pr_err("%s: Couldn't find ACPI handle\n", __func__); return AE_NOT_FOUND; } diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c @@ -626,9 +626,10 @@ static int sdw_program_params(struct sdw_bus *bus) return ret; } -static int sdw_bank_switch(struct sdw_bus *bus) +static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count) { int col_index, row_index; + bool multi_link; struct sdw_msg *wr_msg; u8 *wbuf = NULL; int ret = 0; @@ -638,6 +639,8 @@ static int sdw_bank_switch(struct sdw_bus *bus) if (!wr_msg) return -ENOMEM; + bus->defer_msg.msg = wr_msg; + wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL); if (!wbuf) { ret = -ENOMEM; @@ -658,17 +661,29 @@ static int sdw_bank_switch(struct sdw_bus *bus) SDW_MSG_FLAG_WRITE, wbuf); wr_msg->ssp_sync = true; - ret = sdw_transfer(bus, wr_msg); + /* + * Set the multi_link flag only when both the hardware supports + * and there is a stream handled by multiple masters + */ + multi_link = bus->multi_link && (m_rt_count > 1); + + if (multi_link) + ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg); + else + ret = sdw_transfer(bus, wr_msg); + if (ret < 0) { dev_err(bus->dev, "Slave frame_ctrl reg write failed"); goto error; } - kfree(wr_msg); - kfree(wbuf); - bus->defer_msg.msg = NULL; - bus->params.curr_bank = !bus->params.curr_bank; - bus->params.next_bank = !bus->params.next_bank; + if (!multi_link) { + kfree(wr_msg); + kfree(wbuf); + bus->defer_msg.msg = NULL; + bus->params.curr_bank = !bus->params.curr_bank; + bus->params.next_bank = !bus->params.next_bank; + } return 0; @@ -679,37 +694,138 @@ error_1: return ret; } +/** + * sdw_ml_sync_bank_switch: Multilink register bank switch + * + * @bus: SDW bus instance + * + * Caller function should free the buffers on error + */ +static int sdw_ml_sync_bank_switch(struct sdw_bus *bus) +{ + unsigned long time_left; + + if (!bus->multi_link) + return 0; + + /* Wait for completion of transfer */ + time_left = wait_for_completion_timeout(&bus->defer_msg.complete, + bus->bank_switch_timeout); + + if (!time_left) { + dev_err(bus->dev, "Controller Timed out on bank switch"); + return -ETIMEDOUT; + } + + bus->params.curr_bank = !bus->params.curr_bank; + bus->params.next_bank = !bus->params.next_bank; + + if (bus->defer_msg.msg) { + kfree(bus->defer_msg.msg->buf); + kfree(bus->defer_msg.msg); + } + + return 0; +} + static int do_bank_switch(struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; + struct sdw_master_runtime *m_rt = NULL; const struct sdw_master_ops *ops; - struct sdw_bus *bus = m_rt->bus; + struct sdw_bus *bus = NULL; + bool multi_link = false; int ret = 0; - ops = bus->ops; + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + ops = bus->ops; + + if (bus->multi_link) { + multi_link = true; + mutex_lock(&bus->msg_lock); + } + + /* Pre-bank switch */ + if (ops->pre_bank_switch) { + ret = ops->pre_bank_switch(bus); + if (ret < 0) { + dev_err(bus->dev, + "Pre bank switch op failed: %d", ret); + goto msg_unlock; + } + } - /* Pre-bank switch */ - if (ops->pre_bank_switch) { - ret = ops->pre_bank_switch(bus); + /* + * Perform Bank switch operation. + * For multi link cases, the actual bank switch is + * synchronized across all Masters and happens later as a + * part of post_bank_switch ops. + */ + ret = sdw_bank_switch(bus, stream->m_rt_count); if (ret < 0) { - dev_err(bus->dev, "Pre bank switch op failed: %d", ret); - return ret; + dev_err(bus->dev, "Bank switch failed: %d", ret); + goto error; + } } - /* Bank switch */ - ret = sdw_bank_switch(bus); - if (ret < 0) { - dev_err(bus->dev, "Bank switch failed: %d", ret); - return ret; - } + /* + * For multi link cases, it is expected that the bank switch is + * triggered by the post_bank_switch for the first Master in the list + * and for the other Masters the post_bank_switch() should return doing + * nothing. + */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + ops = bus->ops; + + /* Post-bank switch */ + if (ops->post_bank_switch) { + ret = ops->post_bank_switch(bus); + if (ret < 0) { + dev_err(bus->dev, + "Post bank switch op failed: %d", ret); + goto error; + } + } else if (bus->multi_link && stream->m_rt_count > 1) { + dev_err(bus->dev, + "Post bank switch ops not implemented"); + goto error; + } + + /* Set the bank switch timeout to default, if not set */ + if (!bus->bank_switch_timeout) + bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT; - /* Post-bank switch */ - if (ops->post_bank_switch) { - ret = ops->post_bank_switch(bus); + /* Check if bank switch was successful */ + ret = sdw_ml_sync_bank_switch(bus); if (ret < 0) { dev_err(bus->dev, - "Post bank switch op failed: %d", ret); + "multi link bank switch failed: %d", ret); + goto error; + } + + mutex_unlock(&bus->msg_lock); + } + + return ret; + +error: + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + + bus = m_rt->bus; + + kfree(bus->defer_msg.msg->buf); + kfree(bus->defer_msg.msg); + } + +msg_unlock: + + if (multi_link) { + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + if (mutex_is_locked(&bus->msg_lock)) + mutex_unlock(&bus->msg_lock); } } @@ -747,12 +863,29 @@ struct sdw_stream_runtime *sdw_alloc_stream(char *stream_name) return NULL; stream->name = stream_name; + INIT_LIST_HEAD(&stream->master_list); stream->state = SDW_STREAM_ALLOCATED; + stream->m_rt_count = 0; return stream; } EXPORT_SYMBOL(sdw_alloc_stream); +static struct sdw_master_runtime +*sdw_find_master_rt(struct sdw_bus *bus, + struct sdw_stream_runtime *stream) +{ + struct sdw_master_runtime *m_rt = NULL; + + /* Retrieve Bus handle if already available */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + if (m_rt->bus == bus) + return m_rt; + } + + return NULL; +} + /** * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle * @@ -769,12 +902,11 @@ static struct sdw_master_runtime { struct sdw_master_runtime *m_rt; - m_rt = stream->m_rt; - /* * check if Master is already allocated (as a result of Slave adding * it first), if so skip allocation and go to configure */ + m_rt = sdw_find_master_rt(bus, stream); if (m_rt) goto stream_config; @@ -785,7 +917,7 @@ static struct sdw_master_runtime /* Initialization of Master runtime handle */ INIT_LIST_HEAD(&m_rt->port_list); INIT_LIST_HEAD(&m_rt->slave_rt_list); - stream->m_rt = m_rt; + list_add_tail(&m_rt->stream_node, &stream->master_list); list_add_tail(&m_rt->bus_node, &bus->m_rt_list); @@ -843,17 +975,21 @@ static void sdw_slave_port_release(struct sdw_bus *bus, struct sdw_stream_runtime *stream) { struct sdw_port_runtime *p_rt, *_p_rt; - struct sdw_master_runtime *m_rt = stream->m_rt; + struct sdw_master_runtime *m_rt; struct sdw_slave_runtime *s_rt; - list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { - if (s_rt->slave != slave) - continue; + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) { - list_for_each_entry_safe(p_rt, _p_rt, - &s_rt->port_list, port_node) { - list_del(&p_rt->port_node); - kfree(p_rt); + if (s_rt->slave != slave) + continue; + + list_for_each_entry_safe(p_rt, _p_rt, + &s_rt->port_list, port_node) { + + list_del(&p_rt->port_node); + kfree(p_rt); + } } } } @@ -870,16 +1006,18 @@ static void sdw_release_slave_stream(struct sdw_slave *slave, struct sdw_stream_runtime *stream) { struct sdw_slave_runtime *s_rt, *_s_rt; - struct sdw_master_runtime *m_rt = stream->m_rt; + struct sdw_master_runtime *m_rt; - /* Retrieve Slave runtime handle */ - list_for_each_entry_safe(s_rt, _s_rt, - &m_rt->slave_rt_list, m_rt_node) { + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + /* Retrieve Slave runtime handle */ + list_for_each_entry_safe(s_rt, _s_rt, + &m_rt->slave_rt_list, m_rt_node) { - if (s_rt->slave == slave) { - list_del(&s_rt->m_rt_node); - kfree(s_rt); - return; + if (s_rt->slave == slave) { + list_del(&s_rt->m_rt_node); + kfree(s_rt); + return; + } } } } @@ -887,6 +1025,7 @@ static void sdw_release_slave_stream(struct sdw_slave *slave, /** * sdw_release_master_stream() - Free Master runtime handle * + * @m_rt: Master runtime node * @stream: Stream runtime handle. * * This function is to be called with bus_lock held @@ -894,9 +1033,9 @@ static void sdw_release_slave_stream(struct sdw_slave *slave, * handle. If this is called first then sdw_release_slave_stream() will have * no effect as Slave(s) runtime handle would already be freed up. */ -static void sdw_release_master_stream(struct sdw_stream_runtime *stream) +static void sdw_release_master_stream(struct sdw_master_runtime *m_rt, + struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; struct sdw_slave_runtime *s_rt, *_s_rt; list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { @@ -904,7 +1043,9 @@ static void sdw_release_master_stream(struct sdw_stream_runtime *stream) sdw_release_slave_stream(s_rt->slave, stream); } + list_del(&m_rt->stream_node); list_del(&m_rt->bus_node); + kfree(m_rt); } /** @@ -918,13 +1059,23 @@ static void sdw_release_master_stream(struct sdw_stream_runtime *stream) int sdw_stream_remove_master(struct sdw_bus *bus, struct sdw_stream_runtime *stream) { + struct sdw_master_runtime *m_rt, *_m_rt; + mutex_lock(&bus->bus_lock); - sdw_release_master_stream(stream); - sdw_master_port_release(bus, stream->m_rt); - stream->state = SDW_STREAM_RELEASED; - kfree(stream->m_rt); - stream->m_rt = NULL; + list_for_each_entry_safe(m_rt, _m_rt, + &stream->master_list, stream_node) { + + if (m_rt->bus != bus) + continue; + + sdw_master_port_release(bus, m_rt); + sdw_release_master_stream(m_rt, stream); + stream->m_rt_count--; + } + + if (list_empty(&stream->master_list)) + stream->state = SDW_STREAM_RELEASED; mutex_unlock(&bus->bus_lock); @@ -1107,6 +1258,18 @@ int sdw_stream_add_master(struct sdw_bus *bus, mutex_lock(&bus->bus_lock); + /* + * For multi link streams, add the second master only if + * the bus supports it. + * Check if bus->multi_link is set + */ + if (!bus->multi_link && stream->m_rt_count > 0) { + dev_err(bus->dev, + "Multilink not supported, link %d", bus->link_id); + ret = -EINVAL; + goto unlock; + } + m_rt = sdw_alloc_master_rt(bus, stream_config, stream); if (!m_rt) { dev_err(bus->dev, @@ -1124,10 +1287,12 @@ int sdw_stream_add_master(struct sdw_bus *bus, if (ret) goto stream_error; + stream->m_rt_count++; + goto unlock; stream_error: - sdw_release_master_stream(stream); + sdw_release_master_stream(m_rt, stream); unlock: mutex_unlock(&bus->bus_lock); return ret; @@ -1205,7 +1370,7 @@ stream_error: * we hit error so cleanup the stream, release all Slave(s) and * Master runtime */ - sdw_release_master_stream(stream); + sdw_release_master_stream(m_rt, stream); error: mutex_unlock(&slave->bus->bus_lock); return ret; @@ -1245,33 +1410,82 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave, return NULL; } +/** + * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s) + * + * @stream: SoundWire stream + * + * Acquire bus_lock for each of the master runtime(m_rt) part of this + * stream to reconfigure the bus. + * NOTE: This function is called from SoundWire stream ops and is + * expected that a global lock is held before acquiring bus_lock. + */ +static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream) +{ + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; + + /* Iterate for all Master(s) in Master list */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + + mutex_lock(&bus->bus_lock); + } +} + +/** + * sdw_release_bus_lock: Release bus lock for all Master runtime(s) + * + * @stream: SoundWire stream + * + * Release the previously held bus_lock after reconfiguring the bus. + * NOTE: This function is called from SoundWire stream ops and is + * expected that a global lock is held before releasing bus_lock. + */ +static void sdw_release_bus_lock(struct sdw_stream_runtime *stream) +{ + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; + + /* Iterate for all Master(s) in Master list */ + list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + mutex_unlock(&bus->bus_lock); + } +} + static int _sdw_prepare_stream(struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; - struct sdw_bus *bus = m_rt->bus; + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; struct sdw_master_prop *prop = NULL; struct sdw_bus_params params; int ret; - prop = &bus->prop; - memcpy(&params, &bus->params, sizeof(params)); + /* Prepare Master(s) and Slave(s) port(s) associated with stream */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + prop = &bus->prop; + memcpy(&params, &bus->params, sizeof(params)); - /* TODO: Support Asynchronous mode */ - if ((prop->max_freq % stream->params.rate) != 0) { - dev_err(bus->dev, "Async mode not supported"); - return -EINVAL; - } + /* TODO: Support Asynchronous mode */ + if ((prop->max_freq % stream->params.rate) != 0) { + dev_err(bus->dev, "Async mode not supported"); + return -EINVAL; + } - /* Increment cumulative bus bandwidth */ - /* TODO: Update this during Device-Device support */ - bus->params.bandwidth += m_rt->stream->params.rate * - m_rt->ch_count * m_rt->stream->params.bps; + /* Increment cumulative bus bandwidth */ + /* TODO: Update this during Device-Device support */ + bus->params.bandwidth += m_rt->stream->params.rate * + m_rt->ch_count * m_rt->stream->params.bps; + + /* Program params */ + ret = sdw_program_params(bus); + if (ret < 0) { + dev_err(bus->dev, "Program params failed: %d", ret); + goto restore_params; + } - /* Program params */ - ret = sdw_program_params(bus); - if (ret < 0) { - dev_err(bus->dev, "Program params failed: %d", ret); - goto restore_params; } ret = do_bank_switch(stream); @@ -1280,12 +1494,16 @@ static int _sdw_prepare_stream(struct sdw_stream_runtime *stream) goto restore_params; } - /* Prepare port(s) on the new clock configuration */ - ret = sdw_prep_deprep_ports(m_rt, true); - if (ret < 0) { - dev_err(bus->dev, "Prepare port(s) failed ret = %d", - ret); - return ret; + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + + /* Prepare port(s) on the new clock configuration */ + ret = sdw_prep_deprep_ports(m_rt, true); + if (ret < 0) { + dev_err(bus->dev, "Prepare port(s) failed ret = %d", + ret); + return ret; + } } stream->state = SDW_STREAM_PREPARED; @@ -1313,35 +1531,40 @@ int sdw_prepare_stream(struct sdw_stream_runtime *stream) return -EINVAL; } - mutex_lock(&stream->m_rt->bus->bus_lock); + sdw_acquire_bus_lock(stream); ret = _sdw_prepare_stream(stream); if (ret < 0) pr_err("Prepare for stream:%s failed: %d", stream->name, ret); - mutex_unlock(&stream->m_rt->bus->bus_lock); + sdw_release_bus_lock(stream); return ret; } EXPORT_SYMBOL(sdw_prepare_stream); static int _sdw_enable_stream(struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; - struct sdw_bus *bus = m_rt->bus; + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; int ret; - /* Program params */ - ret = sdw_program_params(bus); - if (ret < 0) { - dev_err(bus->dev, "Program params failed: %d", ret); - return ret; - } + /* Enable Master(s) and Slave(s) port(s) associated with stream */ + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; - /* Enable port(s) */ - ret = sdw_enable_disable_ports(m_rt, true); - if (ret < 0) { - dev_err(bus->dev, "Enable port(s) failed ret: %d", ret); - return ret; + /* Program params */ + ret = sdw_program_params(bus); + if (ret < 0) { + dev_err(bus->dev, "Program params failed: %d", ret); + return ret; + } + + /* Enable port(s) */ + ret = sdw_enable_disable_ports(m_rt, true); + if (ret < 0) { + dev_err(bus->dev, "Enable port(s) failed ret: %d", ret); + return ret; + } } ret = do_bank_switch(stream); @@ -1370,37 +1593,42 @@ int sdw_enable_stream(struct sdw_stream_runtime *stream) return -EINVAL; } - mutex_lock(&stream->m_rt->bus->bus_lock); + sdw_acquire_bus_lock(stream); ret = _sdw_enable_stream(stream); if (ret < 0) pr_err("Enable for stream:%s failed: %d", stream->name, ret); - mutex_unlock(&stream->m_rt->bus->bus_lock); + sdw_release_bus_lock(stream); return ret; } EXPORT_SYMBOL(sdw_enable_stream); static int _sdw_disable_stream(struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; - struct sdw_bus *bus = m_rt->bus; + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; int ret; - /* Disable port(s) */ - ret = sdw_enable_disable_ports(m_rt, false); - if (ret < 0) { - dev_err(bus->dev, "Disable port(s) failed: %d", ret); - return ret; + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + /* Disable port(s) */ + ret = sdw_enable_disable_ports(m_rt, false); + if (ret < 0) { + dev_err(bus->dev, "Disable port(s) failed: %d", ret); + return ret; + } } - stream->state = SDW_STREAM_DISABLED; - /* Program params */ - ret = sdw_program_params(bus); - if (ret < 0) { - dev_err(bus->dev, "Program params failed: %d", ret); - return ret; + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + /* Program params */ + ret = sdw_program_params(bus); + if (ret < 0) { + dev_err(bus->dev, "Program params failed: %d", ret); + return ret; + } } return do_bank_switch(stream); @@ -1422,43 +1650,46 @@ int sdw_disable_stream(struct sdw_stream_runtime *stream) return -EINVAL; } - mutex_lock(&stream->m_rt->bus->bus_lock); + sdw_acquire_bus_lock(stream); ret = _sdw_disable_stream(stream); if (ret < 0) pr_err("Disable for stream:%s failed: %d", stream->name, ret); - mutex_unlock(&stream->m_rt->bus->bus_lock); + sdw_release_bus_lock(stream); return ret; } EXPORT_SYMBOL(sdw_disable_stream); static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream) { - struct sdw_master_runtime *m_rt = stream->m_rt; - struct sdw_bus *bus = m_rt->bus; + struct sdw_master_runtime *m_rt = NULL; + struct sdw_bus *bus = NULL; int ret = 0; - /* De-prepare port(s) */ - ret = sdw_prep_deprep_ports(m_rt, false); - if (ret < 0) { - dev_err(bus->dev, "De-prepare port(s) failed: %d", ret); - return ret; - } + list_for_each_entry(m_rt, &stream->master_list, stream_node) { + bus = m_rt->bus; + /* De-prepare port(s) */ + ret = sdw_prep_deprep_ports(m_rt, false); + if (ret < 0) { + dev_err(bus->dev, "De-prepare port(s) failed: %d", ret); + return ret; + } - stream->state = SDW_STREAM_DEPREPARED; + /* TODO: Update this during Device-Device support */ + bus->params.bandwidth -= m_rt->stream->params.rate * + m_rt->ch_count * m_rt->stream->params.bps; - /* TODO: Update this during Device-Device support */ - bus->params.bandwidth -= m_rt->stream->params.rate * - m_rt->ch_count * m_rt->stream->params.bps; + /* Program params */ + ret = sdw_program_params(bus); + if (ret < 0) { + dev_err(bus->dev, "Program params failed: %d", ret); + return ret; + } - /* Program params */ - ret = sdw_program_params(bus); - if (ret < 0) { - dev_err(bus->dev, "Program params failed: %d", ret); - return ret; } + stream->state = SDW_STREAM_DEPREPARED; return do_bank_switch(stream); } @@ -1478,13 +1709,12 @@ int sdw_deprepare_stream(struct sdw_stream_runtime *stream) return -EINVAL; } - mutex_lock(&stream->m_rt->bus->bus_lock); - + sdw_acquire_bus_lock(stream); ret = _sdw_deprepare_stream(stream); if (ret < 0) pr_err("De-prepare for stream:%d failed: %d", ret, ret); - mutex_unlock(&stream->m_rt->bus->bus_lock); + sdw_release_bus_lock(stream); return ret; } EXPORT_SYMBOL(sdw_deprepare_stream); diff --git a/drivers/thunderbolt/cap.c b/drivers/thunderbolt/cap.c @@ -1,8 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Thunderbolt Cactus Ridge driver - capabilities lookup + * Thunderbolt driver - capabilities lookup * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #include <linux/slab.h> diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c @@ -1,8 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Thunderbolt Cactus Ridge driver - control channel and configuration commands + * Thunderbolt driver - control channel and configuration commands * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #include <linux/crc32.h> @@ -631,7 +632,7 @@ struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data) ctl->rx_packets[i]->frame.callback = tb_ctl_rx_callback; } - tb_ctl_info(ctl, "control channel created\n"); + tb_ctl_dbg(ctl, "control channel created\n"); return ctl; err: tb_ctl_free(ctl); @@ -662,8 +663,7 @@ void tb_ctl_free(struct tb_ctl *ctl) tb_ctl_pkg_free(ctl->rx_packets[i]); - if (ctl->frame_pool) - dma_pool_destroy(ctl->frame_pool); + dma_pool_destroy(ctl->frame_pool); kfree(ctl); } @@ -673,7 +673,7 @@ void tb_ctl_free(struct tb_ctl *ctl) void tb_ctl_start(struct tb_ctl *ctl) { int i; - tb_ctl_info(ctl, "control channel starting...\n"); + tb_ctl_dbg(ctl, "control channel starting...\n"); tb_ring_start(ctl->tx); /* is used to ack hotplug packets, start first */ tb_ring_start(ctl->rx); for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) @@ -702,7 +702,7 @@ void tb_ctl_stop(struct tb_ctl *ctl) if (!list_empty(&ctl->request_queue)) tb_ctl_WARN(ctl, "dangling request in request_queue\n"); INIT_LIST_HEAD(&ctl->request_queue); - tb_ctl_info(ctl, "control channel stopped\n"); + tb_ctl_dbg(ctl, "control channel stopped\n"); } /* public interface, commands */ diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h @@ -1,8 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Thunderbolt Cactus Ridge driver - control channel and configuration commands + * Thunderbolt driver - control channel and configuration commands * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #ifndef _TB_CFG diff --git a/drivers/thunderbolt/dma_port.c b/drivers/thunderbolt/dma_port.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Thunderbolt DMA configuration based mailbox support * * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/delay.h> diff --git a/drivers/thunderbolt/dma_port.h b/drivers/thunderbolt/dma_port.h @@ -1,13 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * Thunderbolt DMA configuration based mailbox support * * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #ifndef DMA_PORT_H_ diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Thunderbolt bus support * * Copyright (C) 2017, Intel Corporation - * Author: Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. + * Author: Mika Westerberg <mika.westerberg@linux.intel.com> */ #include <linux/device.h> diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c @@ -1,8 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Thunderbolt Cactus Ridge driver - eeprom access + * Thunderbolt driver - eeprom access * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #include <linux/crc32.h> @@ -540,7 +541,7 @@ int tb_drom_read(struct tb_switch *sw) return res; size &= 0x3ff; size += TB_DROM_DATA_START; - tb_sw_info(sw, "reading drom (length: %#x)\n", size); + tb_sw_dbg(sw, "reading drom (length: %#x)\n", size); if (size < sizeof(*header)) { tb_sw_warn(sw, "drom too small, aborting\n"); return -EIO; diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Internal Thunderbolt Connection Manager. This is a firmware running on * the Thunderbolt host controller performing most of the low-level @@ -6,10 +7,6 @@ * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/delay.h> diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c @@ -1,10 +1,11 @@ /* - * Thunderbolt Cactus Ridge driver - NHI driver + * Thunderbolt driver - NHI driver * * The NHI (native host interface) is the pci device that allows us to send and * receive frames from the thunderbolt bus. * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #include <linux/pm_runtime.h> @@ -95,9 +96,9 @@ static void ring_interrupt_active(struct tb_ring *ring, bool active) else new = old & ~mask; - dev_info(&ring->nhi->pdev->dev, - "%s interrupt at register %#x bit %d (%#x -> %#x)\n", - active ? "enabling" : "disabling", reg, bit, old, new); + dev_dbg(&ring->nhi->pdev->dev, + "%s interrupt at register %#x bit %d (%#x -> %#x)\n", + active ? "enabling" : "disabling", reg, bit, old, new); if (new == old) dev_WARN(&ring->nhi->pdev->dev, @@ -476,8 +477,9 @@ static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size, void *poll_data) { struct tb_ring *ring = NULL; - dev_info(&nhi->pdev->dev, "allocating %s ring %d of size %d\n", - transmit ? "TX" : "RX", hop, size); + + dev_dbg(&nhi->pdev->dev, "allocating %s ring %d of size %d\n", + transmit ? "TX" : "RX", hop, size); /* Tx Ring 2 is reserved for E2E workaround */ if (transmit && hop == RING_E2E_UNUSED_HOPID) @@ -585,8 +587,8 @@ void tb_ring_start(struct tb_ring *ring) dev_WARN(&ring->nhi->pdev->dev, "ring already started\n"); goto err; } - dev_info(&ring->nhi->pdev->dev, "starting %s %d\n", - RING_TYPE(ring), ring->hop); + dev_dbg(&ring->nhi->pdev->dev, "starting %s %d\n", + RING_TYPE(ring), ring->hop); if (ring->flags & RING_FLAG_FRAME) { /* Means 4096 */ @@ -647,8 +649,8 @@ void tb_ring_stop(struct tb_ring *ring) { spin_lock_irq(&ring->nhi->lock); spin_lock(&ring->lock); - dev_info(&ring->nhi->pdev->dev, "stopping %s %d\n", - RING_TYPE(ring), ring->hop); + dev_dbg(&ring->nhi->pdev->dev, "stopping %s %d\n", + RING_TYPE(ring), ring->hop); if (ring->nhi->going_away) goto err; if (!ring->running) { @@ -716,10 +718,8 @@ void tb_ring_free(struct tb_ring *ring) ring->descriptors_dma = 0; - dev_info(&ring->nhi->pdev->dev, - "freeing %s %d\n", - RING_TYPE(ring), - ring->hop); + dev_dbg(&ring->nhi->pdev->dev, "freeing %s %d\n", RING_TYPE(ring), + ring->hop); /** * ring->work can no longer be scheduled (it is scheduled only @@ -931,7 +931,8 @@ static int nhi_runtime_resume(struct device *dev) static void nhi_shutdown(struct tb_nhi *nhi) { int i; - dev_info(&nhi->pdev->dev, "shutdown\n"); + + dev_dbg(&nhi->pdev->dev, "shutdown\n"); for (i = 0; i < nhi->hop_count; i++) { if (nhi->tx_rings[i]) @@ -1059,7 +1060,7 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) return -ENODEV; } - dev_info(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); + dev_dbg(&nhi->pdev->dev, "NHI initialized, starting thunderbolt\n"); res = tb_domain_add(tb); if (res) { diff --git a/drivers/thunderbolt/nhi.h b/drivers/thunderbolt/nhi.h @@ -1,8 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Thunderbolt Cactus Ridge driver - NHI driver + * Thunderbolt driver - NHI driver * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #ifndef DSL3510_H_ diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h @@ -3,6 +3,7 @@ * Thunderbolt driver - NHI registers * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #ifndef NHI_REGS_H_ diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c @@ -13,19 +13,19 @@ static void tb_dump_hop(struct tb_port *port, struct tb_regs_hop *hop) { - tb_port_info(port, " Hop through port %d to hop %d (%s)\n", - hop->out_port, hop->next_hop, - hop->enable ? "enabled" : "disabled"); - tb_port_info(port, " Weight: %d Priority: %d Credits: %d Drop: %d\n", - hop->weight, hop->priority, - hop->initial_credits, hop->drop_packages); - tb_port_info(port, " Counter enabled: %d Counter index: %d\n", - hop->counter_enable, hop->counter); - tb_port_info(port, " Flow Control (In/Eg): %d/%d Shared Buffer (In/Eg): %d/%d\n", - hop->ingress_fc, hop->egress_fc, - hop->ingress_shared_buffer, hop->egress_shared_buffer); - tb_port_info(port, " Unknown1: %#x Unknown2: %#x Unknown3: %#x\n", - hop->unknown1, hop->unknown2, hop->unknown3); + tb_port_dbg(port, " Hop through port %d to hop %d (%s)\n", + hop->out_port, hop->next_hop, + hop->enable ? "enabled" : "disabled"); + tb_port_dbg(port, " Weight: %d Priority: %d Credits: %d Drop: %d\n", + hop->weight, hop->priority, + hop->initial_credits, hop->drop_packages); + tb_port_dbg(port, " Counter enabled: %d Counter index: %d\n", + hop->counter_enable, hop->counter); + tb_port_dbg(port, " Flow Control (In/Eg): %d/%d Shared Buffer (In/Eg): %d/%d\n", + hop->ingress_fc, hop->egress_fc, + hop->ingress_shared_buffer, hop->egress_shared_buffer); + tb_port_dbg(port, " Unknown1: %#x Unknown2: %#x Unknown3: %#x\n", + hop->unknown1, hop->unknown2, hop->unknown3); } /** diff --git a/drivers/thunderbolt/property.c b/drivers/thunderbolt/property.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Thunderbolt XDomain property support * * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/err.h> diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c @@ -1,8 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Thunderbolt Cactus Ridge driver - switch/port utility functions + * Thunderbolt driver - switch/port utility functions * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #include <linux/delay.h> @@ -436,15 +437,15 @@ static const char *tb_port_type(struct tb_regs_port_header *port) static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port) { - tb_info(tb, - " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", - port->port_number, port->vendor_id, port->device_id, - port->revision, port->thunderbolt_version, tb_port_type(port), - port->type); - tb_info(tb, " Max hop id (in/out): %d/%d\n", - port->max_in_hop_id, port->max_out_hop_id); - tb_info(tb, " Max counters: %d\n", port->max_counters); - tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits); + tb_dbg(tb, + " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", + port->port_number, port->vendor_id, port->device_id, + port->revision, port->thunderbolt_version, tb_port_type(port), + port->type); + tb_dbg(tb, " Max hop id (in/out): %d/%d\n", + port->max_in_hop_id, port->max_out_hop_id); + tb_dbg(tb, " Max counters: %d\n", port->max_counters); + tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits); } /** @@ -605,20 +606,18 @@ static int tb_init_port(struct tb_port *port) static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw) { - tb_info(tb, - " Switch: %x:%x (Revision: %d, TB Version: %d)\n", - sw->vendor_id, sw->device_id, sw->revision, - sw->thunderbolt_version); - tb_info(tb, " Max Port Number: %d\n", sw->max_port_number); - tb_info(tb, " Config:\n"); - tb_info(tb, + tb_dbg(tb, " Switch: %x:%x (Revision: %d, TB Version: %d)\n", + sw->vendor_id, sw->device_id, sw->revision, + sw->thunderbolt_version); + tb_dbg(tb, " Max Port Number: %d\n", sw->max_port_number); + tb_dbg(tb, " Config:\n"); + tb_dbg(tb, " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n", - sw->upstream_port_number, sw->depth, - (((u64) sw->route_hi) << 32) | sw->route_lo, - sw->enabled, sw->plug_events_delay); - tb_info(tb, - " unknown1: %#x unknown4: %#x\n", - sw->__unknown1, sw->__unknown4); + sw->upstream_port_number, sw->depth, + (((u64) sw->route_hi) << 32) | sw->route_lo, + sw->enabled, sw->plug_events_delay); + tb_dbg(tb, " unknown1: %#x unknown4: %#x\n", + sw->__unknown1, sw->__unknown4); } /** @@ -634,7 +633,7 @@ int tb_switch_reset(struct tb *tb, u64 route) header.route_lo = route, header.enabled = true, }; - tb_info(tb, "resetting switch at %llx\n", route); + tb_dbg(tb, "resetting switch at %llx\n", route); res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route, 0, 2, 2, 2); if (res.err) @@ -1139,7 +1138,7 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent, if (tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5)) goto err_free_sw_ports; - tb_info(tb, "current switch config:\n"); + tb_dbg(tb, "current switch config:\n"); tb_dump_switch(tb, &sw->config); /* configure switch */ @@ -1246,9 +1245,8 @@ int tb_switch_configure(struct tb_switch *sw) int ret; route = tb_route(sw); - tb_info(tb, - "initializing Switch at %#llx (depth: %d, up port: %d)\n", - route, tb_route_length(route), sw->config.upstream_port_number); + tb_dbg(tb, "initializing Switch at %#llx (depth: %d, up port: %d)\n", + route, tb_route_length(route), sw->config.upstream_port_number); if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL) tb_sw_warn(sw, "unknown switch vendor id %#x\n", @@ -1386,13 +1384,13 @@ int tb_switch_add(struct tb_switch *sw) tb_sw_warn(sw, "tb_eeprom_read_rom failed\n"); return ret; } - tb_sw_info(sw, "uid: %#llx\n", sw->uid); + tb_sw_dbg(sw, "uid: %#llx\n", sw->uid); tb_switch_set_uuid(sw); for (i = 0; i <= sw->config.max_port_number; i++) { if (sw->ports[i].disabled) { - tb_port_info(&sw->ports[i], "disabled by eeprom\n"); + tb_port_dbg(&sw->ports[i], "disabled by eeprom\n"); continue; } ret = tb_init_port(&sw->ports[i]); @@ -1405,6 +1403,14 @@ int tb_switch_add(struct tb_switch *sw) if (ret) return ret; + if (tb_route(sw)) { + dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n", + sw->vendor, sw->device); + if (sw->vendor_name && sw->device_name) + dev_info(&sw->dev, "%s %s\n", sw->vendor_name, + sw->device_name); + } + ret = tb_switch_nvm_add(sw); if (ret) { device_del(&sw->dev); @@ -1456,6 +1462,9 @@ void tb_switch_remove(struct tb_switch *sw) tb_plug_events_active(sw, false); tb_switch_nvm_remove(sw); + + if (tb_route(sw)) + dev_info(&sw->dev, "device disconnected\n"); device_unregister(&sw->dev); } @@ -1483,7 +1492,7 @@ void tb_sw_set_unplugged(struct tb_switch *sw) int tb_switch_resume(struct tb_switch *sw) { int i, err; - tb_sw_info(sw, "resuming switch\n"); + tb_sw_dbg(sw, "resuming switch\n"); /* * Check for UID of the connected switches except for root diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c @@ -404,10 +404,10 @@ static int tb_suspend_noirq(struct tb *tb) { struct tb_cm *tcm = tb_priv(tb); - tb_info(tb, "suspending...\n"); + tb_dbg(tb, "suspending...\n"); tb_switch_suspend(tb->root_switch); tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ - tb_info(tb, "suspend finished\n"); + tb_dbg(tb, "suspend finished\n"); return 0; } @@ -417,7 +417,7 @@ static int tb_resume_noirq(struct tb *tb) struct tb_cm *tcm = tb_priv(tb); struct tb_pci_tunnel *tunnel, *n; - tb_info(tb, "resuming...\n"); + tb_dbg(tb, "resuming...\n"); /* remove any pci devices the firmware might have setup */ tb_switch_reset(tb, 0); @@ -432,12 +432,12 @@ static int tb_resume_noirq(struct tb *tb) * the pcie links need some time to get going. * 100ms works for me... */ - tb_info(tb, "tunnels restarted, sleeping for 100ms\n"); + tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); msleep(100); } /* Allow tb_handle_hotplug to progress events */ tcm->hotplug_active = true; - tb_info(tb, "resume finished\n"); + tb_dbg(tb, "resume finished\n"); return 0; } diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h @@ -1,8 +1,9 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Thunderbolt Cactus Ridge driver - bus logic (NHI independent) + * Thunderbolt driver - bus logic (NHI independent) * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #ifndef TB_H_ @@ -327,7 +328,7 @@ static inline int tb_port_write(struct tb_port *port, const void *buffer, #define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg) #define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg) #define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg) - +#define tb_dbg(tb, fmt, arg...) dev_dbg(&(tb)->nhi->pdev->dev, fmt, ## arg) #define __TB_SW_PRINT(level, sw, fmt, arg...) \ do { \ @@ -338,7 +339,7 @@ static inline int tb_port_write(struct tb_port *port, const void *buffer, #define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg) #define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg) #define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg) - +#define tb_sw_dbg(sw, fmt, arg...) __TB_SW_PRINT(tb_dbg, sw, fmt, ##arg) #define __TB_PORT_PRINT(level, _port, fmt, arg...) \ do { \ @@ -352,6 +353,8 @@ static inline int tb_port_write(struct tb_port *port, const void *buffer, __TB_PORT_PRINT(tb_warn, port, fmt, ##arg) #define tb_port_info(port, fmt, arg...) \ __TB_PORT_PRINT(tb_info, port, fmt, ##arg) +#define tb_port_dbg(port, fmt, arg...) \ + __TB_PORT_PRINT(tb_dbg, port, fmt, ##arg) struct tb *icm_probe(struct tb_nhi *nhi); struct tb *tb_probe(struct tb_nhi *nhi); diff --git a/drivers/thunderbolt/tb_msgs.h b/drivers/thunderbolt/tb_msgs.h @@ -1,12 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * Thunderbolt control channel messages * * Copyright (C) 2014 Andreas Noever <andreas.noever@gmail.com> * Copyright (C) 2017, Intel Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #ifndef _TB_MSGS diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h @@ -1,12 +1,13 @@ /* SPDX-License-Identifier: GPL-2.0 */ /* - * Thunderbolt Cactus Ridge driver - Port/Switch config area registers + * Thunderbolt driver - Port/Switch config area registers * * Every thunderbolt device consists (logically) of a switch with multiple * ports. Every port contains up to four config regions (HOPS, PORT, SWITCH, * COUNTERS) which are used to configure the device. * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> + * Copyright (C) 2018, Intel Corporation */ #ifndef _TB_REGS diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c @@ -1,13 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Thunderbolt XDomain discovery protocol support * * Copyright (C) 2017, Intel Corporation * Authors: Michael Jamet <michael.jamet@intel.com> * Mika Westerberg <mika.westerberg@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/device.h> diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c @@ -274,6 +274,8 @@ static struct class uio_class = { .dev_groups = uio_groups, }; +static bool uio_class_registered; + /* * device functions */ @@ -668,7 +670,7 @@ static vm_fault_t uio_vma_fault(struct vm_fault *vmf) struct page *page; unsigned long offset; void *addr; - int ret = 0; + vm_fault_t ret = 0; int mi; mutex_lock(&idev->info_lock); @@ -736,7 +738,8 @@ static int uio_mmap_physical(struct vm_area_struct *vma) return -EINVAL; vma->vm_ops = &uio_physical_vm_ops; - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + if (idev->info->mem[mi].memtype == UIO_MEM_PHYS) + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); /* * We cannot use the vm_iomap_memory() helper here, @@ -793,18 +796,19 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma) } switch (idev->info->mem[mi].memtype) { - case UIO_MEM_PHYS: - ret = uio_mmap_physical(vma); - break; - case UIO_MEM_LOGICAL: - case UIO_MEM_VIRTUAL: - ret = uio_mmap_logical(vma); - break; - default: - ret = -EINVAL; + case UIO_MEM_IOVA: + case UIO_MEM_PHYS: + ret = uio_mmap_physical(vma); + break; + case UIO_MEM_LOGICAL: + case UIO_MEM_VIRTUAL: + ret = uio_mmap_logical(vma); + break; + default: + ret = -EINVAL; } -out: + out: mutex_unlock(&idev->info_lock); return ret; } @@ -876,6 +880,9 @@ static int init_uio_class(void) printk(KERN_ERR "class_register failed for uio\n"); goto err_class_register; } + + uio_class_registered = true; + return 0; err_class_register: @@ -886,6 +893,7 @@ exit: static void release_uio_class(void) { + uio_class_registered = false; class_unregister(&uio_class); uio_major_cleanup(); } @@ -912,6 +920,9 @@ int __uio_register_device(struct module *owner, struct uio_device *idev; int ret = 0; + if (!uio_class_registered) + return -EPROBE_DEFER; + if (!parent || !info || !info->name || !info->version) return -EINVAL; diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c @@ -163,7 +163,8 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev) dev_err(&pdev->dev, "unable to kmalloc\n"); goto bad2; } - uioinfo->name = pdev->dev.of_node->name; + uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", + pdev->dev.of_node); uioinfo->version = "devicetree"; /* Multiple IRQs are not supported */ diff --git a/drivers/uio/uio_fsl_elbc_gpcm.c b/drivers/uio/uio_fsl_elbc_gpcm.c @@ -382,8 +382,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev) } /* set all UIO data */ - if (node->name) - info->mem[0].name = kstrdup(node->name, GFP_KERNEL); + info->mem[0].name = kasprintf(GFP_KERNEL, "%pOFn", node); info->mem[0].addr = res.start; info->mem[0].size = resource_size(&res); info->mem[0].memtype = UIO_MEM_PHYS; diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c @@ -17,7 +17,6 @@ * # echo -n "ed963694-e847-4b2a-85af-bc9cfc11d6f3" \ * > /sys/bus/vmbus/drivers/uio_hv_generic/bind */ -#define DEBUG 1 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/device.h> @@ -33,13 +32,13 @@ #include "../hv/hyperv_vmbus.h" -#define DRIVER_VERSION "0.02.0" +#define DRIVER_VERSION "0.02.1" #define DRIVER_AUTHOR "Stephen Hemminger <sthemmin at microsoft.com>" #define DRIVER_DESC "Generic UIO driver for VMBus devices" #define HV_RING_SIZE 512 /* pages */ -#define SEND_BUFFER_SIZE (15 * 1024 * 1024) -#define RECV_BUFFER_SIZE (15 * 1024 * 1024) +#define SEND_BUFFER_SIZE (16 * 1024 * 1024) +#define RECV_BU