From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965644AbcKJRgi (ORCPT ); Thu, 10 Nov 2016 12:36:38 -0500 Received: from mga02.intel.com ([134.134.136.20]:6782 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964917AbcKJRgf (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="784963505" Subject: [mm PATCH v3 13/23] arch/openrisc: Add option to skip DMA sync as a part of mapping From: Alexander Duyck To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Jonas Bonn , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 10 Nov 2016 06:35:24 -0500 Message-ID: <20161110113524.76501.87966.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 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 @@ or1k_map_page(struct device *dev, struct page *page, 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 */