From patchwork Wed Dec 11 02:53:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Hubbard X-Patchwork-Id: 11283847 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B62921593 for ; Wed, 11 Dec 2019 02:53:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 78A0320836 for ; Wed, 11 Dec 2019 02:53:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="Mu64ZmWO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 78A0320836 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 287266B2FB3; Tue, 10 Dec 2019 21:53:37 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 20F646B2FB5; Tue, 10 Dec 2019 21:53:37 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0FC166B2FB4; Tue, 10 Dec 2019 21:53:37 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0144.hostedemail.com [216.40.44.144]) by kanga.kvack.org (Postfix) with ESMTP id ED1F36B2FB2 for ; Tue, 10 Dec 2019 21:53:36 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id B5EAC181AEF1D for ; Wed, 11 Dec 2019 02:53:36 +0000 (UTC) X-FDA: 76251340032.16.wool88_76c4933bed047 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,jhubbard@nvidia.com,:akpm@linux-foundation.org:viro@zeniv.linux.org.uk:alex.williamson@redhat.com:benh@kernel.crashing.org:bjorn.topel@intel.com:hch@infradead.org:dan.j.williams@intel.com:daniel@ffwll.ch:david@fromorbit.com:airlied@linux.ie:davem@davemloft.net:ira.weiny@intel.com:jack@suse.cz:jgg@ziepe.ca:axboe@kernel.dk:corbet@lwn.net:jglisse@redhat.com:magnus.karlsson@intel.com:mchehab@kernel.org:mpe@ellerman.id.au:mhocko@suse.com:mike.kravetz@oracle.com:paulus@samba.org:shuah@kernel.org:vbabka@suse.cz:bpf@vger.kernel.org:dri-devel@lists.freedesktop.org:kvm@vger.kernel.org:linux-block@vger.kernel.org:linux-doc@vger.kernel.org:linux-fsdevel@vger.kernel.org:linux-kselftest@vger.kernel.org:linux-media@vger.kernel.org:linux-rdma@vger.kernel.org:linuxppc-dev@lists.ozlabs.org:netdev@vger.kernel.org::linux-kernel@vger.kernel.org:jhubbard@nvidia.com:hverkuil-cisco@xs4all.nl,RULES_HIT:30051:30054:30064:30070:30090,0,RBL:216.228.121.65:@nvidia. com:.lbl X-HE-Tag: wool88_76c4933bed047 X-Filterd-Recvd-Size: 5687 Received: from hqnvemgate26.nvidia.com (hqnvemgate26.nvidia.com [216.228.121.65]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Dec 2019 02:53:35 +0000 (UTC) Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 10 Dec 2019 18:53:27 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Tue, 10 Dec 2019 18:53:34 -0800 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 10 Dec 2019 18:53:34 -0800 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 11 Dec 2019 02:53:33 +0000 Received: from rnnvemgw01.nvidia.com (10.128.109.123) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 11 Dec 2019 02:53:32 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by rnnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Tue, 10 Dec 2019 18:53:32 -0800 From: John Hubbard To: Andrew Morton CC: Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?utf-8?b?QmrDtnJuIFQ=?= =?utf-8?b?w7ZwZWw=?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jason Gunthorpe , Jens Axboe , Jonathan Corbet , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , , , , , , , , , , , , , LKML , John Hubbard , Hans Verkuil Subject: [PATCH v9 18/25] media/v4l2-core: pin_user_pages (FOLL_PIN) and put_user_page() conversion Date: Tue, 10 Dec 2019 18:53:11 -0800 Message-ID: <20191211025318.457113-19-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191211025318.457113-1-jhubbard@nvidia.com> References: <20191211025318.457113-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1576032808; bh=sXkMwo6nCTbLEEe6A0fE3HZE6drkGcT2bf/xg2miV08=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=Mu64ZmWOiLroxy7Jk4HcziftHYKk2Y65S9gUi2CNVjIZ49Rbn19gozn0aYEl4HzfZ W4DZU5XZgTCKk9lvP7qYE4WFAsDa+J3mohmQ6gjxlcEnYCTEntsnIb267IXtoGYMj+ j8W9Sh/plxpVVu8SU39JuMwJevFwtP1BWqMhuNNtzA+kFoAuhJXPqfMf9bV6j8xS1g z7O+eTO1lSljBjFfPjDelqLN1v81NW6qQM6erHzV9bEAR9tXUSS4fNU3rtblHO1bdD WaiAZq7RBOOfSiAIj6j7tNeks2MX/2zW68L3zqMz2qpG52RHJX0b9yl/+8Ay/tvcqK JFvYuaOZz2b4A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 1. Change v4l2 from get_user_pages() to pin_user_pages(). 2. Because all FOLL_PIN-acquired pages must be released via put_user_page(), also convert the put_page() call over to put_user_pages_dirty_lock(). Acked-by: Hans Verkuil Cc: Ira Weiny Signed-off-by: John Hubbard --- drivers/media/v4l2-core/videobuf-dma-sg.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c index 28262190c3ab..162a2633b1e3 100644 --- a/drivers/media/v4l2-core/videobuf-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf-dma-sg.c @@ -183,12 +183,12 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", data, size, dma->nr_pages); - err = get_user_pages(data & PAGE_MASK, dma->nr_pages, + err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, flags | FOLL_LONGTERM, dma->pages, NULL); if (err != dma->nr_pages) { dma->nr_pages = (err >= 0) ? err : 0; - dprintk(1, "get_user_pages: err=%d [%d]\n", err, + dprintk(1, "pin_user_pages: err=%d [%d]\n", err, dma->nr_pages); return err < 0 ? err : -EINVAL; } @@ -349,11 +349,8 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma) BUG_ON(dma->sglen); if (dma->pages) { - for (i = 0; i < dma->nr_pages; i++) { - if (dma->direction == DMA_FROM_DEVICE) - set_page_dirty_lock(dma->pages[i]); - put_page(dma->pages[i]); - } + put_user_pages_dirty_lock(dma->pages, dma->nr_pages, + dma->direction == DMA_FROM_DEVICE); kfree(dma->pages); dma->pages = NULL; }