From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751934AbdJBKmx (ORCPT ); Mon, 2 Oct 2017 06:42:53 -0400 Received: from mga04.intel.com ([192.55.52.120]:54218 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751313AbdJBKi7 (ORCPT ); Mon, 2 Oct 2017 06:38:59 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,469,1500966000"; d="scan'208";a="318496745" From: Mika Westerberg To: Greg Kroah-Hartman , "David S . Miller" Cc: Andreas Noever , Michael Jamet , Yehezkel Bernat , Amir Levy , Mario.Limonciello@dell.com, Lukas Wunner , Andy Shevchenko , Andrew Lunn , Mika Westerberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 15/19] thunderbolt: Add function to retrieve DMA device for the ring Date: Mon, 2 Oct 2017 13:38:42 +0300 Message-Id: <20171002103846.64602-16-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171002103846.64602-1-mika.westerberg@linux.intel.com> References: <20171002103846.64602-1-mika.westerberg@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 Reviewed-by: Andy Shevchenko --- 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_ */ -- 2.14.2