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author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2014-11-11 14:31:56 +0000 |
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committer | David Vrabel <david.vrabel@citrix.com> | 2014-12-04 12:41:48 +0000 |
commit | 2f91fc331ad495a3e602f3d0e7fd6211b1d91204 (patch) | |
tree | 9b72ca8a9588b42f947afcb603a6dab55c2d0df5 /arch/arm/xen | |
parent | 35e0be88c426e8d2d6a4ed91d80ea25d73d127aa (diff) | |
download | lwn-2f91fc331ad495a3e602f3d0e7fd6211b1d91204.tar.gz lwn-2f91fc331ad495a3e602f3d0e7fd6211b1d91204.zip |
xen/arm: if(pfn_valid(pfn)) call native dma_ops
Remove code duplication in mm32.c by calling the native dma_ops if the
page is a local page (not a foreign page). Use a simple pfn_valid(pfn)
check to figure out if the page is local, exploiting the fact that dom0
is mapped 1:1, therefore pfn_valid always returns false when called on a
foreign mfn.
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/xen')
-rw-r--r-- | arch/arm/xen/mm32.c | 50 |
1 files changed, 11 insertions, 39 deletions
diff --git a/arch/arm/xen/mm32.c b/arch/arm/xen/mm32.c index 6153d61f0907..5bb8391188c8 100644 --- a/arch/arm/xen/mm32.c +++ b/arch/arm/xen/mm32.c @@ -4,13 +4,15 @@ #include <linux/highmem.h> #include <xen/features.h> - +enum dma_cache_op { + DMA_UNMAP, + DMA_MAP, +}; /* functions called by SWIOTLB */ static void dma_cache_maint(dma_addr_t handle, unsigned long offset, - size_t size, enum dma_data_direction dir, - void (*op)(const void *, size_t, int)) + size_t size, enum dma_data_direction dir, enum dma_cache_op op) { unsigned long pfn; size_t left = size; @@ -20,34 +22,8 @@ static void dma_cache_maint(dma_addr_t handle, unsigned long offset, do { size_t len = left; - void *vaddr; - if (!pfn_valid(pfn)) - { - /* TODO: cache flush */ - } else { - struct page *page = pfn_to_page(pfn); - - if (PageHighMem(page)) { - if (len + offset > PAGE_SIZE) - len = PAGE_SIZE - offset; - - if (cache_is_vipt_nonaliasing()) { - vaddr = kmap_atomic(page); - op(vaddr + offset, len, dir); - kunmap_atomic(vaddr); - } else { - vaddr = kmap_high_get(page); - if (vaddr) { - op(vaddr + offset, len, dir); - kunmap_high(page); - } - } - } else { - vaddr = page_address(page) + offset; - op(vaddr, len, dir); - } - } + /* TODO: cache flush */ offset = 0; pfn++; @@ -58,20 +34,16 @@ static void dma_cache_maint(dma_addr_t handle, unsigned long offset, static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { - /* Cannot use __dma_page_dev_to_cpu because we don't have a - * struct page for handle */ - - dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, dmac_unmap_area); + dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP); } static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { - - dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, dmac_map_area); + dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP); } -void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, +void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) @@ -84,7 +56,7 @@ void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, __xen_dma_page_dev_to_cpu(hwdev, handle, size, dir); } -void xen_dma_sync_single_for_cpu(struct device *hwdev, +void __xen_dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { if (!__generic_dma_ops(hwdev)->sync_single_for_cpu) @@ -92,7 +64,7 @@ void xen_dma_sync_single_for_cpu(struct device *hwdev, __xen_dma_page_dev_to_cpu(hwdev, handle, size, dir); } -void xen_dma_sync_single_for_device(struct device *hwdev, +void __xen_dma_sync_single_for_device(struct device *hwdev, dma_addr_t handle, size_t size, enum dma_data_direction dir) { if (!__generic_dma_ops(hwdev)->sync_single_for_device) |