From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_NEOMUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB4ECC65BAF for ; Mon, 10 Dec 2018 07:27:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 897652082F for ; Mon, 10 Dec 2018 07:27:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 897652082F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726294AbeLJH1C (ORCPT ); Mon, 10 Dec 2018 02:27:02 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:48877 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726029AbeLJH1B (ORCPT ); Mon, 10 Dec 2018 02:27:01 -0500 Received: from ptx.hi.pengutronix.de ([2001:67c:670:100:1d::c0]) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gWFxq-0000Q7-N1; Mon, 10 Dec 2018 08:26:50 +0100 Received: from sha by ptx.hi.pengutronix.de with local (Exim 4.89) (envelope-from ) id 1gWFxo-00049o-Im; Mon, 10 Dec 2018 08:26:48 +0100 Date: Mon, 10 Dec 2018 08:26:48 +0100 From: Sascha Hauer To: Christoph Hellwig Cc: Shawn Guo , Fabio Estevam , linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org Subject: Re: dma_declare_coherent_memory on main memory Message-ID: <20181210072648.ore6xttedsgpndi4@pengutronix.de> References: <20181207153432.GA24917@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181207153432.GA24917@lst.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 08:25:52 up 180 days, 16:34, 120 users, load average: 0.17, 0.12, 0.11 User-Agent: NeoMutt/20170113 (1.7.2) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 07, 2018 at 04:34:32PM +0100, Christoph Hellwig wrote: > Hi all, > > the ARM imx27/31 ports and various sh boards use > dma_declare_coherent_memory on main memory taken from the memblock > allocator. > > Is there any good reason these couldn't be switched to CMA areas? > Getting rid of these magic dma_declare_coherent_memory area would > help making the dma allocator a lot simpler. At least for i.MX27/31 I'd say this predates CMA support, so historical reasons. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |