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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.

Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Will Deacon 2013-11-05 15:59:53 +00:00
parent 06f983dd57
commit ca13bb3d4e
1 changed files with 4 additions and 3 deletions
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7
include/linux/iommu.h
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@ -24,9 +24,10 @@
#include <linux/types.h>
#include <trace/events/iommu.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)
struct iommu_ops;
struct iommu_group;