iommu/arm-smmu: set a more appropriate DMA mask

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Since we use dma_map_page() as an architecture-independent means of
making page table updates visible to non-coherent SMMUs, we need to
have a suitable DMA mask set to discourage the DMA mapping layer from
creating bounce buffers and flushing those instead, if said page tables
happen to lie outside the default 32-bit mask.

Tested-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: added error checking]
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Robin Murphy 2015-03-04 16:41:05 +00:00 • committed by Will Deacon

parent 4a1c93cbe9

commit f1d8454869

1 changed files with 9 additions and 0 deletions

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drivers/iommu/arm-smmu.c

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