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iommu: add IOMMU_EXEC flag for safely allowing XN mappings 

Whilst most IOMMU mappings should probably be non-executable, there
may be cases (HSA?) where executable mappings are required.

This patch introduces a new mapping flag, IOMMU_EXEC, to indicate that
the mapping should be mapped as executable.

Change-Id: Id669243403d04a032a8b6316f60993c1f9048197
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: ca13bb3d4e54f5c30089e55d5b8f4bb80c8f05e2
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Will Deacon 2013-11-05 15:59:53 +00:00 committed by Mitchel Humpherys
parent 7dd146b7f3
commit 6fec32fa0b
1 changed files with 4 additions and 3 deletions
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7
include/linux/iommu.h
View File

@ -25,9 +25,10 @@
#include <linux/types.h>
#include <linux/scatterlist.h>
#define IOMMU_READ (1)
#define IOMMU_WRITE (2)
#define IOMMU_CACHE (4) /* DMA cache coherency */
#define IOMMU_READ (1 << 0)
#define IOMMU_WRITE (1 << 1)
#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
#define IOMMU_EXEC (1 << 3)
#define IOMMU_PRIV (16)
struct iommu_ops;