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-rw-r--r--include/linux/iommu.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a5c539fa5d2b..34b643227df1 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -30,6 +30,7 @@
#define IOMMU_WRITE (1 << 1)
#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
#define IOMMU_NOEXEC (1 << 3)
+#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
struct iommu_ops;
struct iommu_group;