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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 0cf3a4e43f23..3af4ffd591b9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -21,6 +21,7 @@
#define IOMMU_READ (1)
#define IOMMU_WRITE (2)
+#define IOMMU_CACHE (4) /* DMA cache coherency */
struct device;