diff --git a/include/linux/device.h b/include/linux/device.h
index 479c0b3..2258d89 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -410,6 +410,15 @@
 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 extern void devm_kfree(struct device *dev, void *p);
 
+struct device_dma_parameters {
+	/*
+	 * a low level driver may set these to teach IOMMU code about
+	 * sg limitations.
+	 */
+	unsigned int max_segment_size;
+	unsigned long segment_boundary_mask;
+};
+
 struct device {
 	struct klist		klist_children;
 	struct klist_node	knode_parent;	/* node in sibling list */
@@ -445,6 +454,8 @@
 					     64 bit addresses for consistent
 					     allocations such descriptors. */
 
+	struct device_dma_parameters *dma_parms;
+
 	struct list_head	dma_pools;	/* dma pools (if dma'ble) */
 
 	struct dma_coherent_mem	*dma_mem; /* internal for coherent mem