提交 38bdbdc7 编写于 作者: A Alexander Duyck 提交者: Linus Torvalds

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.comSigned-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
Cc: James Hogan <james.hogan@imgtec.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 5140d234
......@@ -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);
}
}
......
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