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=-8.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 A68C3C4727D for ; Tue, 22 Sep 2020 10:56:20 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0D77B23A5F for ; Tue, 22 Sep 2020 10:56:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D77B23A5F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=alpha.franken.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 7FA5D872C4; Tue, 22 Sep 2020 10:56:19 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OGI+n6C6bsHx; Tue, 22 Sep 2020 10:56:18 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 8A8FC872D1; Tue, 22 Sep 2020 10:56:17 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 758D1C0891; Tue, 22 Sep 2020 10:56:17 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id D0D17C0051 for ; Tue, 22 Sep 2020 10:56:15 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id CCC0A866B2 for ; Tue, 22 Sep 2020 10:56:15 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oVRUgY30VEC7 for ; Tue, 22 Sep 2020 10:56:13 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from elvis.franken.de (elvis.franken.de [193.175.24.41]) by whitealder.osuosl.org (Postfix) with ESMTP id 76FE586272 for ; Tue, 22 Sep 2020 10:56:13 +0000 (UTC) Received: from uucp (helo=alpha) by elvis.franken.de with local-bsmtp (Exim 3.36 #1) id 1kKfxr-000822-01; Tue, 22 Sep 2020 12:56:03 +0200 Received: by alpha.franken.de (Postfix, from userid 1000) id B061AC0FFF; Tue, 22 Sep 2020 10:49:34 +0200 (CEST) Date: Tue, 22 Sep 2020 10:49:34 +0200 From: Thomas Bogendoerfer To: Christoph Hellwig Subject: Re: [PATCH 07/18] 53c700: improve non-coherent DMA handling Message-ID: <20200922084934.GB8477@alpha.franken.de> References: <20200915155122.1768241-1-hch@lst.de> <20200915155122.1768241-8-hch@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200915155122.1768241-8-hch@lst.de> User-Agent: Mutt/1.5.23 (2014-03-12) Cc: alsa-devel@alsa-project.org, linux-doc@vger.kernel.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, "James E.J. Bottomley" , linux-mm@kvack.org, linux1394-devel@lists.sourceforge.net, linux-samsung-soc@vger.kernel.org, Joonyoung Shim , linux-scsi@vger.kernel.org, Ben Skeggs , Matt Porter , linux-media@vger.kernel.org, Mauro Carvalho Chehab , linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, netdev@vger.kernel.org, Seung-Woo Kim , linux-mips@vger.kernel.org, iommu@lists.linux-foundation.org, Stefan Richter X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, Sep 15, 2020 at 05:51:11PM +0200, Christoph Hellwig wrote: > Switch the 53c700 driver to only use non-coherent descriptor memory if it > really has to because dma_alloc_coherent fails. This doesn't matter for > any of the platforms it runs on currently, but that will change soon. > > To help with this two new helpers to transfer ownership to and from the > device are added that abstract the syncing of the non-coherent memory. > The two current bidirectional cases are mapped to transfers to the > device, as that appears to what they are used for. Note that for parisc, > which is the only architecture this driver needs to use non-coherent > memory on, the direction argument of dma_cache_sync is ignored, so this > will not change behavior in any way. > > Signed-off-by: Christoph Hellwig > --- > drivers/scsi/53c700.c | 113 +++++++++++++++++++++++------------------- > drivers/scsi/53c700.h | 17 ++++--- > 2 files changed, 72 insertions(+), 58 deletions(-) Tested-by: Thomas Bogendoerfer -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. 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