iommu: add IOMMU_PRIV attribute

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

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0ff5111f69595bf9ec93c93677a80816066da820..69e2417a2965fbbc1728d19c99cf41cea306f8d6 100644 (file)
--- 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;