Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932861AbcKBROQ (ORCPT ); Wed, 2 Nov 2016 13:14:16 -0400 Received: from mga05.intel.com ([192.55.52.43]:9128 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932406AbcKBRON (ORCPT ); Wed, 2 Nov 2016 13:14:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,583,1473145200"; d="scan'208";a="186836949" Subject: [mm PATCH v2 04/26] arch/arc: Add option to skip sync on DMA mapping From: Alexander Duyck To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Vineet Gupta , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Date: Wed, 02 Nov 2016 07:13:11 -0400 Message-ID: <20161102111308.79519.45058.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161102111031.79519.14741.stgit@ahduyck-blue-test.jf.intel.com> References: <20161102111031.79519.14741.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: 853 Lines: 26 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 later via a sync_for_cpu or sync_for_device call. Acked-by: Vineet Gupta Signed-off-by: Alexander Duyck --- arch/arc/mm/dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 60aab5a..ea207d2 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c @@ -133,7 +133,10 @@ static dma_addr_t arc_dma_map_page(struct device *dev, struct page *page, unsigned long attrs) { phys_addr_t paddr = page_to_phys(page) + offset; - _dma_cache_sync(paddr, size, dir); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + _dma_cache_sync(paddr, size, dir); + return plat_phys_to_dma(dev, paddr); }