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Commit 3304559e authored by Mika Westerberg's avatar Mika Westerberg Committed by David S. Miller
Browse files

thunderbolt: Add function to retrieve DMA device for the ring 



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

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarMichael Jamet <michael.jamet@intel.com>
Reviewed-by: default avatarYehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4ffe722e

include/linux/thunderbolt.h

+13 −0
Original line number Diff line number Diff line
@@ -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_ */