iommu/dma: Skip extra sync during unmap w/swiotlb

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Calling the iommu_dma_sync_*_for_cpu functions during unmap can cause
two copies out of the swiotlb buffer. Do the arch sync directly in
__iommu_dma_unmap_swiotlb instead to avoid this. This makes the call to
iommu_dma_sync_sg_for_cpu for untrusted devices in iommu_dma_unmap_sg no
longer necessary, so move that invocation later in the function.

Signed-off-by: David Stevens <stevensd@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20210929023300.335969-4-stevensd@google.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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David Stevens 2021-09-29 11:32:56 +09:00 • committed by Joerg Roedel

parent 06e620345d

commit ee9d4097cc

1 changed files with 6 additions and 5 deletions

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drivers/iommu/dma-iommu.c

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