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arm64/dma-mapping: Implement DMA_ATTR_PRIVILEGED

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The newly added DMA_ATTR_PRIVILEGED is useful for creating mappings that
are only accessible to privileged DMA engines.  Implement it in
dma-iommu.c so that the ARM64 DMA IOMMU mapper can make use of it.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mitchel Humpherys 2017-01-06 18:58:12 +05:30 • committed by Will Deacon
parent b2fb366425
commit 737c85ca1c
3 changed files with 14 additions and 7 deletions
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3
include/linux/dma-iommu.h
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@ -34,7 +34,8 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
u64 size, struct device *dev);
/* General helpers for DMA-API <-> IOMMU-API interaction */
int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);
int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
unsigned long attrs);
/*
* These implement the bulk of the relevant DMA mapping callbacks, but require