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=-10.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 027B7C43463 for ; Mon, 21 Sep 2020 06:36:38 +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 7D3F12084C for ; Mon, 21 Sep 2020 06:36:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D3F12084C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.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 23E058266F; Mon, 21 Sep 2020 06:36:37 +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 D4rTAmGzgvUm; Mon, 21 Sep 2020 06:36:36 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 83629821E2; Mon, 21 Sep 2020 06:36:36 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7443AC0859; Mon, 21 Sep 2020 06:36:36 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 882BCC0051 for ; Mon, 21 Sep 2020 06:36:35 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 67DF28241E for ; Mon, 21 Sep 2020 06:36:35 +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 mkoNUYofTrDD for ; Mon, 21 Sep 2020 06:36:34 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by hemlock.osuosl.org (Postfix) with ESMTPS id B5AB1821E2 for ; Mon, 21 Sep 2020 06:36:33 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id B25CE68AFE; Mon, 21 Sep 2020 08:36:28 +0200 (CEST) Date: Mon, 21 Sep 2020 08:36:28 +0200 From: Christoph Hellwig To: Mauro Carvalho Chehab , Thomas Bogendoerfer , "James E.J. Bottomley" , Joonyoung Shim , Seung-Woo Kim , Ben Skeggs , Marek Szyprowski , Tomasz Figa , Matt Porter , iommu@lists.linux-foundation.org Subject: Re: a saner API for allocating DMA addressable pages v3 Message-ID: <20200921063628.GB18349@lst.de> References: <20200915155122.1768241-1-hch@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200915155122.1768241-1-hch@lst.de> User-Agent: Mutt/1.5.17 (2007-11-01) Cc: alsa-devel@alsa-project.org, linux-samsung-soc@vger.kernel.org, linux-scsi@vger.kernel.org, linux-parisc@vger.kernel.org, linux-doc@vger.kernel.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, Stefan Richter , netdev@vger.kernel.org, linux1394-devel@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org 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" Any comments? Thomas: this should be identical to the git tree I gave you for mips testing, and you add your tested-by (and reviewd-by tags where applicable)? Helge: for parisc this should effectively be the same as the first version, but I've dropped the tested-by tags due to the reshuffle, and chance you could retest it? On Tue, Sep 15, 2020 at 05:51:04PM +0200, Christoph Hellwig wrote: > Hi all, > > this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs > with a separate new dma_alloc_pages API, which is available on all > platforms. In addition to cleaning up the convoluted code path, this > ensures that other drivers that have asked for better support for > non-coherent DMA to pages with incurring bounce buffering over can finally > be properly supported. > > As a follow up I plan to move the implementation of the > DMA_ATTR_NO_KERNEL_MAPPING flag over to this framework as well, given > that is also is a fundamentally non coherent allocation. The replacement > for that flag would then return a struct page, as it is allowed to > actually return pages without a kernel mapping as the name suggested > (although most of the time they will actually have a kernel mapping..) > > In addition to the conversions of the existing non-coherent DMA users, > I've also added a patch to convert the firewire ohci driver to use > the new dma_alloc_pages API. > > The first patch is queued up for 5.9 in the media tree, but included here > for completeness. > > > A git tree is available here: > > git://git.infradead.org/users/hch/misc.git dma_alloc_pages > > Gitweb: > > http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma_alloc_pages > > > Changes since v2: > - fix up the patch reshuffle which wasn't quite correct > - fix up a few commit messages > > Changes since v1: > - rebased on the latests dma-mapping tree, which merged many of the > cleanups > - fix an argument passing typo in 53c700, caught by sparse > - rename a few macro arguments in 53c700 > - pass the right device to the DMA API in the lib82596 drivers > - fix memory ownershiptransfers in sgiseeq > - better document what a page in the direct kernel mapping means > - split into dma_alloc_pages that returns a struct page and is in the > direct mapping vs dma_alloc_noncoherent that can be vmapped > - conver the firewire ohci driver to dma_alloc_pages > > Diffstat: > _______________________________________________ > iommu mailing list > iommu@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu ---end quoted text--- _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu