diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2017-10-02 13:38:42 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-02 11:24:41 -0700 |
| commit | 3304559e353f098d7e0ed5ca981e26c406513e12 (patch) | |
| tree | 09481629e751d4d853adb460e940779e384e5713 /include | |
| parent | 4ffe722eefcb07c76701f03e0d759fbaecedf79f (diff) | |
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: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/thunderbolt.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h index 36925e3aec7c..7b69853188b1 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_ */ |