From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f72.google.com (mail-it0-f72.google.com [209.85.214.72]) by kanga.kvack.org (Postfix) with ESMTP id 654A228025B for ; Thu, 10 Nov 2016 12:36:35 -0500 (EST) Received: by mail-it0-f72.google.com with SMTP id w132so39678069ita.1 for ; Thu, 10 Nov 2016 09:36:35 -0800 (PST) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTPS id q7si5008548pay.339.2016.11.10.09.36.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Nov 2016 09:36:34 -0800 (PST) Subject: [mm PATCH v3 13/23] arch/openrisc: Add option to skip DMA sync as a part of mapping From: Alexander Duyck 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> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Jonas Bonn , netdev@vger.kernel.org, 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 */ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org