1 files changed, 24 insertions, 14 deletions

diff --git a/include/linux/ntb.h b/include/linux/ntb.h
index 191b524e5c0d..879c3e89e026 100644
--- a/include/linux/ntb.h
+++ b/include/linux/ntb.h
@@ -256,6 +256,7 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)
  * @msg_clear_mask:	See ntb_msg_clear_mask().
  * @msg_read:		See ntb_msg_read().
  * @peer_msg_write:	See ntb_peer_msg_write().
+ * @get_dma_dev:	See ntb_get_dma_dev().
  */
 struct ntb_dev_ops {
 	int (*port_number)(struct ntb_dev *ntb);
@@ -329,6 +330,7 @@ struct ntb_dev_ops {
 	int (*msg_clear_mask)(struct ntb_dev *ntb, u64 mask_bits);
 	u32 (*msg_read)(struct ntb_dev *ntb, int *pidx, int midx);
 	int (*peer_msg_write)(struct ntb_dev *ntb, int pidx, int midx, u32 msg);
+	struct device *(*get_dma_dev)(struct ntb_dev *ntb);
 };
 
 static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
@@ -391,6 +393,8 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops)
 		/* !ops->msg_clear_mask == !ops->msg_count	&& */
 		!ops->msg_read == !ops->msg_count		&&
 		!ops->peer_msg_write == !ops->msg_count		&&
+
+		/* ops->get_dma_dev is optional */
 		1;
 }
 
@@ -1564,6 +1568,26 @@ static inline int ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx,
 }
 
 /**
+ * ntb_get_dma_dev() - get the device to use for DMA allocations/mappings
+ * @ntb:	NTB device context.
+ *
+ * Return a struct device suitable for DMA API allocations and mappings.
+ * This is typically the parent of the NTB device, but may be overridden by a
+ * driver by implementing .get_dma_dev().
+ *
+ * Drivers that implement .get_dma_dev() must return a non-NULL pointer.
+ *
+ * Return: device pointer to use for DMA operations.
+ */
+static inline struct device *ntb_get_dma_dev(struct ntb_dev *ntb)
+{
+	if (!ntb->ops->get_dma_dev)
+		return ntb->dev.parent;
+
+	return ntb->ops->get_dma_dev(ntb);
+}
+
+/**
  * ntb_peer_resource_idx() - get a resource index for a given peer idx
  * @ntb:	NTB device context.
  * @pidx:	Peer port index.
@@ -1647,12 +1671,8 @@ int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb, irq_handler_t handler,
 				  irq_handler_t thread_fn,
 				  const char *name, void *dev_id,
 				  struct ntb_msi_desc *msi_desc);
-void ntbm_msi_free_irq(struct ntb_dev *ntb, unsigned int irq, void *dev_id);
 int ntb_msi_peer_trigger(struct ntb_dev *ntb, int peer,
 			 struct ntb_msi_desc *desc);
-int ntb_msi_peer_addr(struct ntb_dev *ntb, int peer,
-		      struct ntb_msi_desc *desc,
-		      phys_addr_t *msi_addr);
 
 #else /* not CONFIG_NTB_MSI */
 
@@ -1674,21 +1694,11 @@ static inline int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb,
 {
 	return -EOPNOTSUPP;
 }
-static inline void ntbm_msi_free_irq(struct ntb_dev *ntb, unsigned int irq,
-				     void *dev_id) {}
 static inline int ntb_msi_peer_trigger(struct ntb_dev *ntb, int peer,
 				       struct ntb_msi_desc *desc)
 {
 	return -EOPNOTSUPP;
 }
-static inline int ntb_msi_peer_addr(struct ntb_dev *ntb, int peer,
-				    struct ntb_msi_desc *desc,
-				    phys_addr_t *msi_addr)
-{
-	return -EOPNOTSUPP;
-
-}
-
 #endif /* CONFIG_NTB_MSI */
 
 static inline int ntbm_msi_request_irq(struct ntb_dev *ntb,