[PATCH 14/16] thunderbolt: Add function to retrieve DMA device for the ring

[Mika Westerberg <mika.westerberg@linux.intel.com>]

This is needed when Thunderbolt service drivers need to DMA map memory
before it is passed down to the ring.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
---
 include/linux/thunderbolt.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h
index 9a63210d5084..d479a9e508cd 100644
--- a/include/linux/thunderbolt.h
+++ b/include/linux/thunderbolt.h
@@ -19,6 +19,7 @@
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/mod_devicetable.h>
+#include <linux/pci.h>
 #include <linux/uuid.h>
 #include <linux/workqueue.h>
 
@@ -582,4 +583,16 @@ static inline int tb_ring_tx(struct tb_ring *ring, struct ring_frame *frame)
 struct ring_frame *tb_ring_poll(struct tb_ring *ring);
 void tb_ring_poll_complete(struct tb_ring *ring);
 
+/**
+ * tb_ring_dma_device() - Return device used for DMA mapping
+ * @ring: Ring whose DMA device is retrieved
+ *
+ * Use this function when you are mapping DMA for buffers that are
+ * passed to the ring for sending/receiving.
+ */
+static inline struct device *tb_ring_dma_device(struct tb_ring *ring)
+{
+	return &ring->nhi->pdev->dev;
+}
+
 #endif /* THUNDERBOLT_H_ */
-- 
2.13.5