From: Alexander Duyck Date: Wed, 14 Dec 2016 23:05:23 +0000 (-0800) Subject: dma: add calls for dma_map_page_attrs and dma_unmap_page_attrs X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0495c3d367944e4af053983ff3cdf256b567b053;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git dma: add calls for dma_map_page_attrs and dma_unmap_page_attrs Add support for mapping and unmapping a page with attributes. The primary use for this is currently to allow for us to pass the DMA_ATTR_SKIP_CPU_SYNC attribute when mapping and unmapping a page. On some architectures such as ARM the synchronization has significant overhead and if we are already taking care of the sync_for_cpu and sync_for_device from the driver there isn't much need to handle this in the map/unmap calls as well. Link: http://lkml.kernel.org/r/20161110113601.76501.46095.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 08528afdf58b..10c5a17b1f51 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -243,29 +243,33 @@ static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg ops->unmap_sg(dev, sg, nents, dir, attrs); } -static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, - size_t offset, size_t size, - enum dma_data_direction dir) +static inline dma_addr_t dma_map_page_attrs(struct device *dev, + struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs) { struct dma_map_ops *ops = get_dma_ops(dev); dma_addr_t addr; kmemcheck_mark_initialized(page_address(page) + offset, size); BUG_ON(!valid_dma_direction(dir)); - addr = ops->map_page(dev, page, offset, size, dir, 0); + addr = ops->map_page(dev, page, offset, size, dir, attrs); debug_dma_map_page(dev, page, offset, size, dir, addr, false); return addr; } -static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, - size_t size, enum dma_data_direction dir) +static inline void dma_unmap_page_attrs(struct device *dev, + dma_addr_t addr, size_t size, + enum dma_data_direction dir, + unsigned long attrs) { struct dma_map_ops *ops = get_dma_ops(dev); BUG_ON(!valid_dma_direction(dir)); if (ops->unmap_page) - ops->unmap_page(dev, addr, size, dir, 0); + ops->unmap_page(dev, addr, size, dir, attrs); debug_dma_unmap_page(dev, addr, size, dir, false); } @@ -385,6 +389,8 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, #define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0) #define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0) #define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0) +#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0) +#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size);