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commit c180f1b04be01d025aa1e6e53e1a8b6626bd90c4
parent 6a2651b55bcf5b56177d4ccaeb52adeeadb142ea
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun, 27 Jan 2019 09:18:05 -0800

Merge tag 'dma-mapping-5.0-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fix from Christoph Hellwig:
 "Fix a xen-swiotlb regression on arm64"

* tag 'dma-mapping-5.0-2' of git://git.infradead.org/users/hch/dma-mapping:
  arm64/xen: fix xen-swiotlb cache flushing

Diffstat:
March/arm/include/asm/xen/page-coherent.h | 94+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
March/arm64/include/asm/device.h | 3---
March/arm64/include/asm/xen/page-coherent.h | 76++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
March/arm64/mm/dma-mapping.c | 4+---
Mdrivers/xen/swiotlb-xen.c | 4++--
Minclude/xen/arm/page-coherent.h | 97+++----------------------------------------------------------------------------
6 files changed, 176 insertions(+), 102 deletions(-)

diff --git a/arch/arm/include/asm/xen/page-coherent.h b/arch/arm/include/asm/xen/page-coherent.h @@ -1 +1,95 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H +#define _ASM_ARM_XEN_PAGE_COHERENT_H + +#include <linux/dma-mapping.h> +#include <asm/page.h> #include <xen/arm/page-coherent.h> + +static inline const struct dma_map_ops *xen_get_dma_ops(struct device *dev) +{ + if (dev && dev->archdata.dev_dma_ops) + return dev->archdata.dev_dma_ops; + return get_arch_dma_ops(NULL); +} + +static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size, + dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs) +{ + return xen_get_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs); +} + +static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, + void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) +{ + xen_get_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs); +} + +static inline void xen_dma_map_page(struct device *hwdev, struct page *page, + dma_addr_t dev_addr, unsigned long offset, size_t size, + enum dma_data_direction dir, unsigned long attrs) +{ + unsigned long page_pfn = page_to_xen_pfn(page); + unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr); + unsigned long compound_pages = + (1<<compound_order(page)) * XEN_PFN_PER_PAGE; + bool local = (page_pfn <= dev_pfn) && + (dev_pfn - page_pfn < compound_pages); + + /* + * Dom0 is mapped 1:1, while the Linux page can span across + * multiple Xen pages, it's not possible for it to contain a + * mix of local and foreign Xen pages. So if the first xen_pfn + * == mfn the page is local otherwise it's a foreign page + * grant-mapped in dom0. If the page is local we can safely + * call the native dma_ops function, otherwise we call the xen + * specific function. + */ + if (local) + xen_get_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs); + else + __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs); +} + +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + unsigned long pfn = PFN_DOWN(handle); + /* + * Dom0 is mapped 1:1, while the Linux page can be spanned accross + * multiple Xen page, it's not possible to have a mix of local and + * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a + * foreign mfn will always return false. If the page is local we can + * safely call the native dma_ops function, otherwise we call the xen + * specific function. + */ + if (pfn_valid(pfn)) { + if (xen_get_dma_ops(hwdev)->unmap_page) + xen_get_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs); + } else + __xen_dma_unmap_page(hwdev, handle, size, dir, attrs); +} + +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev, + dma_addr_t handle, size_t size, enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(handle); + if (pfn_valid(pfn)) { + if (xen_get_dma_ops(hwdev)->sync_single_for_cpu) + xen_get_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir); + } else + __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir); +} + +static inline void xen_dma_sync_single_for_device(struct device *hwdev, + dma_addr_t handle, size_t size, enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(handle); + if (pfn_valid(pfn)) { + if (xen_get_dma_ops(hwdev)->sync_single_for_device) + xen_get_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir); + } else + __xen_dma_sync_single_for_device(hwdev, handle, size, dir); +} + +#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */ diff --git a/arch/arm64/include/asm/device.h b/arch/arm64/include/asm/device.h @@ -20,9 +20,6 @@ struct dev_archdata { #ifdef CONFIG_IOMMU_API void *iommu; /* private IOMMU data */ #endif -#ifdef CONFIG_XEN - const struct dma_map_ops *dev_dma_ops; -#endif }; struct pdev_archdata { diff --git a/arch/arm64/include/asm/xen/page-coherent.h b/arch/arm64/include/asm/xen/page-coherent.h @@ -1 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_ARM64_XEN_PAGE_COHERENT_H +#define _ASM_ARM64_XEN_PAGE_COHERENT_H + +#include <linux/dma-mapping.h> +#include <asm/page.h> #include <xen/arm/page-coherent.h> + +static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size, + dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs) +{ + return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs); +} + +static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, + void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) +{ + dma_direct_free(hwdev, size, cpu_addr, dma_handle, attrs); +} + +static inline void xen_dma_sync_single_for_cpu(struct device *hwdev, + dma_addr_t handle, size_t size, enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(handle); + + if (pfn_valid(pfn)) + dma_direct_sync_single_for_cpu(hwdev, handle, size, dir); + else + __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir); +} + +static inline void xen_dma_sync_single_for_device(struct device *hwdev, + dma_addr_t handle, size_t size, enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(handle); + if (pfn_valid(pfn)) + dma_direct_sync_single_for_device(hwdev, handle, size, dir); + else + __xen_dma_sync_single_for_device(hwdev, handle, size, dir); +} + +static inline void xen_dma_map_page(struct device *hwdev, struct page *page, + dma_addr_t dev_addr, unsigned long offset, size_t size, + enum dma_data_direction dir, unsigned long attrs) +{ + unsigned long page_pfn = page_to_xen_pfn(page); + unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr); + unsigned long compound_pages = + (1<<compound_order(page)) * XEN_PFN_PER_PAGE; + bool local = (page_pfn <= dev_pfn) && + (dev_pfn - page_pfn < compound_pages); + + if (local) + dma_direct_map_page(hwdev, page, offset, size, dir, attrs); + else + __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs); +} + +static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + unsigned long pfn = PFN_DOWN(handle); + /* + * Dom0 is mapped 1:1, while the Linux page can be spanned accross + * multiple Xen page, it's not possible to have a mix of local and + * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a + * foreign mfn will always return false. If the page is local we can + * safely call the native dma_ops function, otherwise we call the xen + * specific function. + */ + if (pfn_valid(pfn)) + dma_direct_unmap_page(hwdev, handle, size, dir, attrs); + else + __xen_dma_unmap_page(hwdev, handle, size, dir, attrs); +} + +#endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */ diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c @@ -466,9 +466,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, __iommu_setup_dma_ops(dev, dma_base, size, iommu); #ifdef CONFIG_XEN - if (xen_initial_domain()) { - dev->archdata.dev_dma_ops = dev->dma_ops; + if (xen_initial_domain()) dev->dma_ops = xen_dma_ops; - } #endif } diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c @@ -645,7 +645,7 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) { -#if defined(CONFIG_ARM) || defined(CONFIG_ARM64) +#ifdef CONFIG_ARM if (xen_get_dma_ops(dev)->mmap) return xen_get_dma_ops(dev)->mmap(dev, vma, cpu_addr, dma_addr, size, attrs); @@ -662,7 +662,7 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t handle, size_t size, unsigned long attrs) { -#if defined(CONFIG_ARM) || defined(CONFIG_ARM64) +#ifdef CONFIG_ARM if (xen_get_dma_ops(dev)->get_sgtable) { #if 0 /* diff --git a/include/xen/arm/page-coherent.h b/include/xen/arm/page-coherent.h @@ -1,17 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H -#define _ASM_ARM_XEN_PAGE_COHERENT_H - -#include <asm/page.h> -#include <asm/dma-mapping.h> -#include <linux/dma-mapping.h> - -static inline const struct dma_map_ops *xen_get_dma_ops(struct device *dev) -{ - if (dev && dev->archdata.dev_dma_ops) - return dev->archdata.dev_dma_ops; - return get_arch_dma_ops(NULL); -} +#ifndef _XEN_ARM_PAGE_COHERENT_H +#define _XEN_ARM_PAGE_COHERENT_H void __xen_dma_map_page(struct device *hwdev, struct page *page, dma_addr_t dev_addr, unsigned long offset, size_t size, @@ -21,87 +10,7 @@ void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, unsigned long attrs); void __xen_dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir); - void __xen_dma_sync_single_for_device(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir); -static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size, - dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs) -{ - return xen_get_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs); -} - -static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, - void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) -{ - xen_get_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs); -} - -static inline void xen_dma_map_page(struct device *hwdev, struct page *page, - dma_addr_t dev_addr, unsigned long offset, size_t size, - enum dma_data_direction dir, unsigned long attrs) -{ - unsigned long page_pfn = page_to_xen_pfn(page); - unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr); - unsigned long compound_pages = - (1<<compound_order(page)) * XEN_PFN_PER_PAGE; - bool local = (page_pfn <= dev_pfn) && - (dev_pfn - page_pfn < compound_pages); - - /* - * Dom0 is mapped 1:1, while the Linux page can span across - * multiple Xen pages, it's not possible for it to contain a - * mix of local and foreign Xen pages. So if the first xen_pfn - * == mfn the page is local otherwise it's a foreign page - * grant-mapped in dom0. If the page is local we can safely - * call the native dma_ops function, otherwise we call the xen - * specific function. - */ - if (local) - xen_get_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs); - else - __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs); -} - -static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, - size_t size, enum dma_data_direction dir, unsigned long attrs) -{ - unsigned long pfn = PFN_DOWN(handle); - /* - * Dom0 is mapped 1:1, while the Linux page can be spanned accross - * multiple Xen page, it's not possible to have a mix of local and - * foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a - * foreign mfn will always return false. If the page is local we can - * safely call the native dma_ops function, otherwise we call the xen - * specific function. - */ - if (pfn_valid(pfn)) { - if (xen_get_dma_ops(hwdev)->unmap_page) - xen_get_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs); - } else - __xen_dma_unmap_page(hwdev, handle, size, dir, attrs); -} - -static inline void xen_dma_sync_single_for_cpu(struct device *hwdev, - dma_addr_t handle, size_t size, enum dma_data_direction dir) -{ - unsigned long pfn = PFN_DOWN(handle); - if (pfn_valid(pfn)) { - if (xen_get_dma_ops(hwdev)->sync_single_for_cpu) - xen_get_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir); - } else - __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir); -} - -static inline void xen_dma_sync_single_for_device(struct device *hwdev, - dma_addr_t handle, size_t size, enum dma_data_direction dir) -{ - unsigned long pfn = PFN_DOWN(handle); - if (pfn_valid(pfn)) { - if (xen_get_dma_ops(hwdev)->sync_single_for_device) - xen_get_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir); - } else - __xen_dma_sync_single_for_device(hwdev, handle, size, dir); -} - -#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */ +#endif /* _XEN_ARM_PAGE_COHERENT_H */