From: Andreas Herrmann <andreas.herrmann@calxeda.com>
Date: Thu, 26 Sep 2013 22:36:15 +0000 (+0200)
Subject: ARM: dma-mapping: Always pass proper prot flags to iommu_map()
X-Git-Tag: v3.12-rc6~16^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9b24996d5da1bf7d2bebab5770dfcc7834c53b7;p=pandora-kernel.git

ARM: dma-mapping: Always pass proper prot flags to iommu_map()

... otherwise it is impossible for the low level iommu driver to
figure out which pte flags should be used.

In __map_sg_chunk we can derive the flags from dma_data_direction.

In __iommu_create_mapping we should treat the memory like
DMA_BIDIRECTIONAL and pass both IOMMU_READ and IOMMU_WRITE to
iommu_map.
__iommu_create_mapping is used during dma_alloc_coherent (via
arm_iommu_alloc_attrs).  AFAIK dma_alloc_coherent is responsible for
allocation _and_ mapping.  I think this implies that access to the
mapped pages should be allowed.

Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---

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