Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941088AbcJXSKZ (ORCPT ); Mon, 24 Oct 2016 14:10:25 -0400 Received: from mga06.intel.com ([134.134.136.31]:34280 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965155AbcJXSGX (ORCPT ); Mon, 24 Oct 2016 14:06:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,542,1473145200"; d="scan'208";a="23452426" Subject: [net-next PATCH RFC 15/26] arch/openrisc: Add option to skip DMA sync as a part of mapping From: Alexander Duyck To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Jonas Bonn , davem@davemloft.net, brouer@redhat.com Date: Mon, 24 Oct 2016 08:05:46 -0400 Message-ID: <20161024120546.16276.32687.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: 765 Lines: 24 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: Jonas Bonn Signed-off-by: Alexander Duyck --- arch/openrisc/kernel/dma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index 140c991..906998b 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -141,6 +141,9 @@ unsigned long cl; dma_addr_t addr = page_to_phys(page) + offset; + if (attrs & DMA_ATTR_SKIP_CPU_SYNC) + return addr; + switch (dir) { case DMA_TO_DEVICE: /* Flush the dcache for the requested range */