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arch/avr32: add option to skip sync on DMA map 

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/20161110113430.76501.79737.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
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 15:04:35 -08:00 committed by Linus Torvalds
parent fc1b138de7
commit e8b4762c22
1 changed files with 6 additions and 1 deletions
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7
arch/avr32/mm/dma-coherent.c
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@ -146,7 +146,8 @@ static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page,
{
void *cpu_addr = page_address(page) + offset;
dma_cache_sync(dev, cpu_addr, size, direction);
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_cache_sync(dev, cpu_addr, size, direction);
return virt_to_bus(cpu_addr);
}
@ -162,6 +163,10 @@ static int avr32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
virt = sg_virt(sg);
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
dma_cache_sync(dev, virt, sg->length, direction);
}