[RFC v3 03/10] iommu: Add new reserved IOMMU attributes

[Eric Auger]

IOMMU_RESV_NOMAP is used to tag reserved IOVAs that are not
supposed to be IOMMU mapped. IOMMU_RESV_MSI tags IOVAs
corresponding to MSIs that need to be IOMMU mapped.

IOMMU_RESV_MASK allows to check if the IOVA is reserved.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
 include/linux/iommu.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7f6ebd0..02cf565 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -32,6 +32,10 @@
 #define IOMMU_NOEXEC	(1 << 3)
 #define IOMMU_MMIO	(1 << 4) /* e.g. things like MSI doorbells */
 
+#define IOMMU_RESV_MASK		0x300 /* Reserved IOVA mask */
+#define IOMMU_RESV_NOMAP	(1 << 8) /* IOVA that cannot be mapped */
+#define IOMMU_RESV_MSI		(1 << 9) /* MSI region transparently mapped */
+
 struct iommu_ops;
 struct iommu_group;
 struct bus_type;
-- 
1.9.1