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arm64: dma-mapping: conditional skip map_sg by attrs

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Add if statement(DMA_ATTR_SKIP_CPU_SYNC) for __swiotlb_map_sg_attrs
to skip invalidating each sg element

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
This commit is contained in:
Shawn Lin
2015-07-08 17:32:06 +08:00
parent f1d8317f7f
commit b80f2f6899
1 changed files with 5 additions and 4 deletions
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9
arch/arm64/mm/dma-mapping.c
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@@ -224,10 +224,11 @@ static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
int i, ret;
ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs);
for_each_sg(sgl, sg, ret, i)
__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
sg->length, dir);
if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) {
for_each_sg(sgl, sg, ret, i)
__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
sg->length, dir);
}
return ret;
}