[PATCH V9 1/9] iommu: add IOMMU_PRIV attribute

From: Sricharan R
Date: Fri Jan 06 2017 - 08:39:45 EST


From: Mitchel Humpherys <mitchelh@xxxxxxxxxxxxxx>

Add the IOMMU_PRIV attribute, which is used to indicate privileged
mappings.

Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Tested-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Mitchel Humpherys <mitchelh@xxxxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
---
include/linux/iommu.h | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0ff5111..69e2417 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -31,6 +31,13 @@
#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
#define IOMMU_NOEXEC (1 << 3)
#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
+/*
+ * This is to make the IOMMU API setup privileged
+ * mapppings accessible by the master only at higher
+ * privileged execution level and inaccessible at
+ * less privileged levels.
+ */
+#define IOMMU_PRIV (1 << 5)

struct iommu_ops;
struct iommu_group;
--
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