diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e57f0b9b5af5..a151cdec9cdd 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -128,6 +128,7 @@ extern struct dentry *iommu_debugfs_top;
  * @trigger_fault: trigger a fault on the device attached to an iommu domain
  * @reg_read: read an IOMMU register
  * @reg_write: write an IOMMU register
+ * @priv: per-instance data private to the iommu driver
  */
 struct iommu_ops {
 	bool (*capable)(enum iommu_cap);
@@ -169,6 +170,7 @@ struct iommu_ops {
 			  unsigned long offset);
 
 	unsigned long pgsize_bitmap;
+	void *priv;
 };
 
 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE		1 /* Device added */