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authorAlexander Duyck <alexander.h.duyck@intel.com>2016-12-15 02:04:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-15 03:04:07 +0300
commitfc1b138de7917d8fda5995aeecdb10c8182d9f75 (patch)
treefffdb4f1cb6d19f1aea545e92aa4f0ceea9ad441 /arch/arm/common
parent8a3385d2d47cd912f28d23bd2225ee37de518d86 (diff)
downloadlinux-fc1b138de7917d8fda5995aeecdb10c8182d9f75.tar.xz
arch/arm: add option to skip sync on DMA map and unmap
The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the DMA APIs in the arch/arm folder. This change is meant to correct that so that we get consistent behavior. Link: http://lkml.kernel.org/r/20161110113424.76501.2715.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/common')
-rw-r--r--arch/arm/common/dmabounce.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 301281645d08..75055df1cda3 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -243,7 +243,8 @@ static int needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
}
static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
- enum dma_data_direction dir)
+ enum dma_data_direction dir,
+ unsigned long attrs)
{
struct dmabounce_device_info *device_info = dev->archdata.dmabounce;
struct safe_buffer *buf;
@@ -262,7 +263,8 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
buf->safe, buf->safe_dma_addr);
- if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) {
+ if ((dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) &&
+ !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
dev_dbg(dev, "%s: copy unsafe %p to safe %p, size %d\n",
__func__, ptr, buf->safe, size);
memcpy(buf->safe, ptr, size);
@@ -272,7 +274,8 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
}
static inline void unmap_single(struct device *dev, struct safe_buffer *buf,
- size_t size, enum dma_data_direction dir)
+ size_t size, enum dma_data_direction dir,
+ unsigned long attrs)
{
BUG_ON(buf->size != size);
BUG_ON(buf->direction != dir);
@@ -283,7 +286,8 @@ static inline void unmap_single(struct device *dev, struct safe_buffer *buf,
DO_STATS(dev->archdata.dmabounce->bounce_count++);
- if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
+ if ((dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) &&
+ !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
void *ptr = buf->ptr;
dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
@@ -334,7 +338,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,
return DMA_ERROR_CODE;
}
- return map_single(dev, page_address(page) + offset, size, dir);
+ return map_single(dev, page_address(page) + offset, size, dir, attrs);
}
/*
@@ -357,7 +361,7 @@ static void dmabounce_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t
return;
}
- unmap_single(dev, buf, size, dir);
+ unmap_single(dev, buf, size, dir, attrs);
}
static int __dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,