Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755927AbdIRPbG (ORCPT ); Mon, 18 Sep 2017 11:31:06 -0400 Received: from mga01.intel.com ([192.55.52.88]:32764 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755509AbdIRPbC (ORCPT ); Mon, 18 Sep 2017 11:31:02 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,413,1500966000"; d="scan'208";a="1220359589" 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 , Mika Westerberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 14/16] thunderbolt: Add function to retrieve DMA device for the ring Date: Mon, 18 Sep 2017 18:30:47 +0300 Message-Id: <20170918153049.44185-15-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170918153049.44185-1-mika.westerberg@linux.intel.com> References: <20170918153049.44185-1-mika.westerberg@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1331 Lines: 41 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 9a63210d5084..d479a9e508cd 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_ */ -- 2.13.5