Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965668AbcKJRgk (ORCPT ); Thu, 10 Nov 2016 12:36:40 -0500 Received: from mga06.intel.com ([134.134.136.31]:4579 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964986AbcKJRgf (ORCPT ); Thu, 10 Nov 2016 12:36:35 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,619,1473145200"; d="scan'208";a="1083512153" Subject: [mm PATCH v3 10/23] arch/microblaze: Add option to skip DMA sync as a part of map and unmap From: Alexander Duyck To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: netdev@vger.kernel.org, Michal Simek , linux-kernel@vger.kernel.org Date: Thu, 10 Nov 2016 06:35:08 -0500 Message-ID: <20161110113508.76501.77583.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 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1634 Lines: 45 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: Michal Simek Signed-off-by: Alexander Duyck --- arch/microblaze/kernel/dma.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c index ec04dc1..818daf2 100644 --- a/arch/microblaze/kernel/dma.c +++ b/arch/microblaze/kernel/dma.c @@ -61,6 +61,10 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, /* FIXME this part of code is untested */ for_each_sg(sgl, sg, nents, i) { sg->dma_address = sg_phys(sg); + + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + continue; + __dma_sync(page_to_phys(sg_page(sg)) + sg->offset, sg->length, direction); } @@ -80,7 +84,8 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev, enum dma_data_direction direction, unsigned long attrs) { - __dma_sync(page_to_phys(page) + offset, size, direction); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + __dma_sync(page_to_phys(page) + offset, size, direction); return page_to_phys(page) + offset; } @@ -95,7 +100,8 @@ static inline void dma_direct_unmap_page(struct device *dev, * phys_to_virt is here because in __dma_sync_page is __virt_to_phys and * dma_address is physical address */ - __dma_sync(dma_address, size, direction); + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + __dma_sync(dma_address, size, direction); } static inline void