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arch/tile: 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/20161110113550.76501.73060.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Duyck 2016-12-14 15:05:18 -08:00 committed by Linus Torvalds
parent 68bbc28f61
commit 33c77e53d8
1 changed files with 10 additions and 2 deletions
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12
arch/tile/kernel/pci-dma.c
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@ -213,10 +213,12 @@ static int tile_dma_map_sg(struct device *dev, struct scatterlist *sglist,
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
__dma_prep_pa_range(sg->dma_address, sg->length, direction);
#ifdef CONFIG_NEED_SG_DMA_LENGTH
sg->dma_length = sg->length;
#endif
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
__dma_prep_pa_range(sg->dma_address, sg->length, direction);
}
return nents;
@ -232,6 +234,8 @@ static void tile_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
BUG_ON(!valid_dma_direction(direction));
for_each_sg(sglist, sg, nents, i) {
sg->dma_address = sg_phys(sg);
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
__dma_complete_pa_range(sg->dma_address, sg->length,
direction);
}
@ -245,7 +249,8 @@ static dma_addr_t tile_dma_map_page(struct device *dev, struct page *page,
BUG_ON(!valid_dma_direction(direction));
BUG_ON(offset + size > PAGE_SIZE);
__dma_prep_page(page, offset, size, direction);
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
__dma_prep_page(page, offset, size, direction);
return page_to_pa(page) + offset;
}
@ -256,6 +261,9 @@ static void tile_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
{
BUG_ON(!valid_dma_direction(direction));
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
return;
__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
dma_address & (PAGE_SIZE - 1), size, direction);
}