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arch/hexagon: Add option to skip DMA sync as a part of mapping 

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
later via a sync_for_cpu or sync_for_device call.

Link: http://lkml.kernel.org/r/20161110113452.76501.45864.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
zero-colors
Alexander Duyck 2016-12-14 15:04:46 -08:00 committed by Linus Torvalds
parent 34f8be79a7
commit b8a346dd47
1 changed files with 5 additions and 1 deletions
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6
arch/hexagon/kernel/dma.c
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@ -119,6 +119,9 @@ static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg,
s->dma_length = s->length;
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
flush_dcache_range(dma_addr_to_virt(s->dma_address),
dma_addr_to_virt(s->dma_address + s->length));
}
@ -180,7 +183,8 @@ static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
if (!check_addr("map_single", dev, bus, size))
return bad_dma_address;
dma_sync(dma_addr_to_virt(bus), size, dir);
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_sync(dma_addr_to_virt(bus), size, dir);
return bus;
}