Commit 6fec32fa authored Nov 05, 2013 by Will Deacon Committed by Mitchel Humpherys Aug 04, 2014

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>

parent 7dd146b7

include/linux/iommu.h

+4 −3

Original line number	Diff line number	Diff line
		@@ -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;