Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758096AbcJXSF0 (ORCPT ); Mon, 24 Oct 2016 14:05:26 -0400 Received: from mga02.intel.com ([134.134.136.20]:39999 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758032AbcJXSFT (ORCPT ); Mon, 24 Oct 2016 14:05:19 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,542,1473145200"; d="scan'208";a="23451916" Subject: [net-next PATCH RFC 03/26] arch/arc: Add option to skip sync on DMA mapping From: Alexander Duyck To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Vineet Gupta , linux-snps-arc@lists.infradead.org, davem@davemloft.net, brouer@redhat.com Date: Mon, 24 Oct 2016 08:04:42 -0400 Message-ID: <20161024120442.16276.95329.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161024115737.16276.71059.stgit@ahduyck-blue-test.jf.intel.com> References: <20161024115737.16276.71059.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: 879 Lines: 25 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. Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org Signed-off-by: Alexander Duyck --- arch/arc/mm/dma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c index 20afc65..d0c4b28 100644 --- a/arch/arc/mm/dma.c +++ b/arch/arc/mm/dma.c @@ -133,7 +133,8 @@ 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); }