From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 9CAE528025B for ; Thu, 10 Nov 2016 12:35:40 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id 17so102955256pfy.2 for ; Thu, 10 Nov 2016 09:35:40 -0800 (PST) Received: from mga05.intel.com (mga05.intel.com. [192.55.52.43]) by mx.google.com with ESMTPS id y10si5999715pgc.54.2016.11.10.09.35.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Nov 2016 09:35:39 -0800 (PST) Subject: [mm PATCH v3 01/23] arch/arc: Add option to skip sync on DMA mapping From: Alexander Duyck 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> 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: Vineet Gupta , linux-kernel@vger.kernel.org, netdev@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 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); } -- 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