From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f70.google.com (mail-pa0-f70.google.com [209.85.220.70]) by kanga.kvack.org (Postfix) with ESMTP id CCB3D280250 for ; Mon, 24 Oct 2016 14:05:19 -0400 (EDT) Received: by mail-pa0-f70.google.com with SMTP id yx5so2556996pac.5 for ; Mon, 24 Oct 2016 11:05:19 -0700 (PDT) Received: from mga06.intel.com (mga06.intel.com. [134.134.136.31]) by mx.google.com with ESMTPS id k15si16657654pga.198.2016.10.24.11.05.19 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Oct 2016 11:05:19 -0700 (PDT) Subject: [net-next PATCH RFC 03/26] arch/arc: Add option to skip sync on DMA mapping From: Alexander Duyck 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> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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 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); } -- 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