Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965467AbcKJRfe (ORCPT ); Thu, 10 Nov 2016 12:35:34 -0500 Received: from mga01.intel.com ([192.55.52.88]:3498 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965160AbcKJRfa (ORCPT ); Thu, 10 Nov 2016 12:35:30 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,619,1473145200"; d="scan'208";a="190002396" Subject: [mm PATCH v3 01/23] 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: Thu, 10 Nov 2016 06:34:19 -0500 Message-ID: <20161110113419.76501.38491.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: 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 20afc65..6303c34 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); }