[PATCH v3 15/19] thunderbolt: Add function to retrieve DMA device for the ring
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: 2017-10-02 10:42:53
Also in:
lkml
Subsystem:
the rest, thunderbolt driver · Maintainers:
Linus Torvalds, Andreas Noever, Mika Westerberg, Yehezkel Bernat
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 <redacted> Reviewed-by: Yehezkel Bernat <redacted> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.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 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_ */
--
2.14.2