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 BAE206B02BA for ; Wed, 2 Nov 2016 13:15:55 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id l66so5297993pfl.7 for ; Wed, 02 Nov 2016 10:15:55 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTPS id c186si4143634pga.181.2016.11.02.10.15.54 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 02 Nov 2016 10:15:55 -0700 (PDT) Subject: [mm PATCH v2 16/26] arch/openrisc: Add option to skip DMA sync as a part of mapping From: Alexander Duyck Date: Wed, 02 Nov 2016 07:14:55 -0400 Message-ID: <20161102111452.79519.97790.stgit@ahduyck-blue-test.jf.intel.com> In-Reply-To: <20161102111031.79519.14741.stgit@ahduyck-blue-test.jf.intel.com> References: <20161102111031.79519.14741.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 @@ 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