diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index be22ad8..0a2ba40 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -30,6 +30,7 @@
 };
 
 #define IOMMU_CAP_CACHE_COHERENCY	0x1
+#define IOMMU_CAP_INTR_REMAP		0x2	/* isolates device intrs */
 
 struct iommu_ops {
 	int (*domain_init)(struct iommu_domain *domain);