From patchwork Thu Nov 10 11:35:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Duyck, Alexander H" X-Patchwork-Id: 693399 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3tF9Jm5J9sz9ssP for ; Fri, 11 Nov 2016 04:39:04 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965799AbcKJRhJ (ORCPT ); Thu, 10 Nov 2016 12:37:09 -0500 Received: from mga09.intel.com ([134.134.136.24]:22782 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965203AbcKJRhH (ORCPT ); Thu, 10 Nov 2016 12:37:07 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP; 10 Nov 2016 09:37:06 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,619,1473145200"; d="scan'208";a="1066806937" Received: from ahduyck-blue-test.jf.intel.com ([134.134.2.201]) by fmsmga001.fm.intel.com with ESMTP; 10 Nov 2016 09:37:05 -0800 Subject: [mm PATCH v3 19/23] arch/xtensa: Add option to skip DMA sync as a part of mapping From: Alexander Duyck To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Max Filippov , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Thu, 10 Nov 2016 06:35:55 -0500 Message-ID: <20161110113555.76501.52536.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161110113027.76501.63030.stgit@ahduyck-blue-test.jf.intel.com> References: <20161110113027.76501.63030.stgit@ahduyck-blue-test.jf.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to avoid invoking cache line invalidation if the driver will just handle it via a sync_for_cpu or sync_for_device call. Cc: Max Filippov Signed-off-by: Alexander Duyck --- arch/xtensa/kernel/pci-dma.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c index 1e68806..6a16dec 100644 --- a/arch/xtensa/kernel/pci-dma.c +++ b/arch/xtensa/kernel/pci-dma.c @@ -189,7 +189,9 @@ static dma_addr_t xtensa_map_page(struct device *dev, struct page *page, { dma_addr_t dma_handle = page_to_phys(page) + offset; - xtensa_sync_single_for_device(dev, dma_handle, size, dir); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + xtensa_sync_single_for_device(dev, dma_handle, size, dir); + return dma_handle; } @@ -197,7 +199,8 @@ static void xtensa_unmap_page(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { - xtensa_sync_single_for_cpu(dev, dma_handle, size, dir); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + xtensa_sync_single_for_cpu(dev, dma_handle, size, dir); } static int xtensa_map_sg(struct device *dev, struct scatterlist *sg,