diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e6a7c9f..7b83f9f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -103,6 +103,7 @@
  * @domain_get_attr: Query domain attributes
  * @domain_set_attr: Change domain attributes
  * @pgsize_bitmap: bitmap of supported page sizes
+ * @priv: per-instance data private to the iommu driver
  */
 struct iommu_ops {
 	bool (*capable)(enum iommu_cap);
@@ -133,6 +134,7 @@
 	u32 (*domain_get_windows)(struct iommu_domain *domain);
 
 	unsigned long pgsize_bitmap;
+	void *priv;
 };
 
 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE		1 /* Device added */