diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8c15c59..9d70344 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1416,6 +1416,15 @@ struct iommu_domain *iommu_get_domain_for_dev(struct device *dev)
 EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev);
 
 /*
+ * For IOMMU_DOMAIN_DMA implementations which already provide their own
+ * guarantees that the group and its default domain are valid and correct.
+ */
+struct iommu_domain *iommu_get_dma_domain(struct device *dev)
+{
+	return dev->iommu_group->default_domain;
+}
+
+/*
  * IOMMU groups are really the natrual working unit of the IOMMU, but
  * the IOMMU API works on domains and devices.  Bridge that gap by
  * iterating over the devices in a group.  Ideally we'd have a single