msm: kgsl: use readonly mappings on the iommu
Userspace passes a flag KGSL_MEMFLAGS_GPUREADONLY when
the gpu should not write to a memory region. Use this
flag to control IOMMU_WRITE permissions on the buffer.
Change-Id: I5d3fc615dc36687252e2242f63fe74d6ce1c4fbc
Signed-off-by:
Jeremy Gebben <jgebben@codeaurora.org>
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