Messages in this thread Patch in this message | | | From | Mika Westerberg <> | Subject | [PATCH 14/16] thunderbolt: Add function to retrieve DMA device for the ring | Date | Mon, 18 Sep 2017 18:30:47 +0300 |
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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
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