tree 20cdf7f8780a0faa5ab7b4c45c2196259b8d9816
parent 5b15694b10132aac92507dfd66e0bfc2af0e9f17
author Liam Mark <lmark@codeaurora.org> 1487964737 -0800
committer Patrick Daly <pdaly@codeaurora.org> 1497392030 -0700

arm64: dma-mapping: optimize unmap coherency check

Change arm_iommu_unmap_page to check the DMA attributes for buffer
coherency support instead of checking the iommu page table.

This change now requires that clients correctly set the
DMA_ATTR_FORCE_COHERENT or DMA_ATTR_FORCE_NON_COHERENT DMA
attributes in their unmap call if they used it with their map call.

This will improve the performance of the arm_iommu_unmap_page
call.

Change-Id: Ie96ef0a1906a8732b7b1eef7bed8aa85abee95f4
Signed-off-by: Liam Mark <lmark@codeaurora.org>