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authorAlexander Duyck <alexander.h.duyck@intel.com>2016-12-14 15:04:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-14 16:04:07 -0800
commit38bdbdc7e391f5326a9f27f0bc8be0c175a73567 (patch)
tree79cd65c08e31dced3a65d0f0d46ab6e91a36e99a /arch
parent5140d2344f1036dadffbb949a60af971b6dde0d3 (diff)
downloadlinux-38bdbdc7e391f5326a9f27f0bc8be0c175a73567.tar.bz2
arch/metag: add option to skip DMA sync as a part of map and unmap
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to avoid invoking cache line invalidation if the driver will just handle it via a sync_for_cpu or sync_for_device call. Link: http://lkml.kernel.org/r/20161110113503.76501.80809.stgit@ahduyck-blue-test.jf.intel.com Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Cc: James Hogan <james.hogan@imgtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/metag/kernel/dma.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/metag/kernel/dma.c b/arch/metag/kernel/dma.c
index 0db31e24c541..91968d92652b 100644
--- a/arch/metag/kernel/dma.c
+++ b/arch/metag/kernel/dma.c
@@ -484,8 +484,9 @@ static dma_addr_t metag_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction, unsigned long attrs)
{
- dma_sync_for_device((void *)(page_to_phys(page) + offset), size,
- direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_sync_for_device((void *)(page_to_phys(page) + offset),
+ size, direction);
return page_to_phys(page) + offset;
}
@@ -493,7 +494,8 @@ static void metag_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
size_t size, enum dma_data_direction direction,
unsigned long attrs)
{
- dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_sync_for_cpu(phys_to_virt(dma_address), size, direction);
}
static int metag_dma_map_sg(struct device *dev, struct scatterlist *sglist,
@@ -507,6 +509,10 @@ static int metag_dma_map_sg(struct device *dev, struct scatterlist *sglist,
BUG_ON(!sg_page(sg));
sg->dma_address = sg_phys(sg);
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
dma_sync_for_device(sg_virt(sg), sg->length, direction);
}
@@ -525,6 +531,10 @@ static void metag_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
BUG_ON(!sg_page(sg));
sg->dma_address = sg_phys(sg);
+
+ if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
+ continue;
+
dma_sync_for_cpu(sg_virt(sg), sg->length, direction);
}
}