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 BD64AC43465 for ; Mon, 21 Sep 2020 06:36:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1636920758 for ; Mon, 21 Sep 2020 06:36:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726236AbgIUGgf (ORCPT ); Mon, 21 Sep 2020 02:36:35 -0400 Received: from verein.lst.de ([213.95.11.211]:38634 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726011AbgIUGge (ORCPT ); Mon, 21 Sep 2020 02:36:34 -0400 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 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 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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200915155122.1768241-1-hch@lst.de> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org 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--- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: a saner API for allocating DMA addressable pages v3 Date: Mon, 21 Sep 2020 08:36:28 +0200 Message-ID: <20200921063628.GB18349@lst.de> References: <20200915155122.1768241-1-hch@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20200915155122.1768241-1-hch-jcswGhMUV9g@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Sender: "iommu" To: Mauro Carvalho Chehab , Thomas Bogendoerfer , "James E.J. Bottomley" , Joonyoung Shim , Seung-Woo Kim , Ben Skeggs , Marek Szyprowski , Tomasz Figa , Matt Porter , iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org, linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-parisc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mips-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Stefan Richter , netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux1394-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: nouveau.vger.kernel.org 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-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu ---end quoted text--- 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 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=-11.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 2DC7DC43464 for ; Mon, 21 Sep 2020 06:37:54 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 C71C620756 for ; Mon, 21 Sep 2020 06:37:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tFGU0LGt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C71C620756 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=XZDnFgbXEI9TetXc+rpYJZBxF1RxWuoduEB93agZHH0=; b=tFGU0LGtlNg696wRImjRklpsh HEkicWH/LapMRxVJLg3x7A9fZH0Jx1gbzkDe/N10GGDCf3XpKh+IbKHlBrnuv2ewTzzz53Pz0Fqpy u7lS0SEm6ZtLwXkdS4uP94l9k2MVi9zlyA7d4BuzNipFSaaK1DAl8/+YyoKMqp9floasebqXPHebN I7e2zEn6GY8yB50OmKkODeB8Jjzn+MhK9JLniM9Lok6BSKEeHGOcJye2+vl+3h3Tn6+5+G0Hj8MuH cD5I+bq77Z5hYFDI/nmkCkUMY/nYTf+tHnwUyANAS6YO0rG0BbDplScKJZyVDNTyydv60emaYIwYI /T3SIA+oQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKFRC-0001Aa-2r; Mon, 21 Sep 2020 06:36:34 +0000 Received: from verein.lst.de ([213.95.11.211]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKFR9-0001AD-Cd for linux-arm-kernel@lists.infradead.org; Mon, 21 Sep 2020 06:36:32 +0000 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) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200921_023631_664735_BB8C2A86 X-CRM114-Status: GOOD ( 30.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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--- _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel