From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: [PATCH v2 14/16] thunderbolt: Add function to retrieve DMA device for the ring Date: Mon, 25 Sep 2017 14:07:36 +0300 Message-ID: <20170925110738.68382-15-mika.westerberg@linux.intel.com> References: <20170925110738.68382-1-mika.westerberg@linux.intel.com> Cc: Andreas Noever , Michael Jamet , Yehezkel Bernat , Amir Levy , Mario.Limonciello@dell.com, Lukas Wunner , Andy Shevchenko , Andrew Lunn , Mika Westerberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: Greg Kroah-Hartman , "David S . Miller" Return-path: In-Reply-To: <20170925110738.68382-1-mika.westerberg@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 Reviewed-by: Michael Jamet Reviewed-by: Yehezkel Bernat --- 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 #include #include +#include #include #include @@ -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_ */ -- 2.14.1