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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 88A7CCA9ED0 for ; Sun, 3 Nov 2019 21:18:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 58E3321D7D for ; Sun, 3 Nov 2019 21:18:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="ex5YaZO2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728718AbfKCVSk (ORCPT ); Sun, 3 Nov 2019 16:18:40 -0500 Received: from hqemgate14.nvidia.com ([216.228.121.143]:6850 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728575AbfKCVS1 (ORCPT ); Sun, 3 Nov 2019 16:18:27 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Sun, 03 Nov 2019 13:18:24 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Sun, 03 Nov 2019 13:18:18 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Sun, 03 Nov 2019 13:18:18 -0800 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sun, 3 Nov 2019 21:18:17 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Sun, 3 Nov 2019 21:18:17 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Sun, 03 Nov 2019 13:18:17 -0800 From: John Hubbard To: Andrew Morton CC: Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , 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?q?J=C3=A9r=C3=B4me=20Glisse?= , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , , , , , , , , , , , , , LKML , John Hubbard Subject: [PATCH v2 13/18] media/v4l2-core: pin_longterm_pages (FOLL_PIN) and put_user_page() conversion Date: Sun, 3 Nov 2019 13:18:08 -0800 Message-ID: <20191103211813.213227-14-jhubbard@nvidia.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191103211813.213227-1-jhubbard@nvidia.com> References: <20191103211813.213227-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1572815904; bh=2ylru9iMViXhFgX9NY0Q3+yFTIQYaU15HbY2+xHJ5C4=; 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=ex5YaZO2FQ75+37+4GgQrb+MHY+nPxHJJ/itwtobXgAbSDiul7ENJ4eK/KWUrmmAx upeS7iJDT1Oe4ipt1geERaDDUXQz28Pr2J89PZF91qYMwXSg2Ymi62IF7eDHVGxAWS yeQkaaUp3HoC5o96OCXbspJYHCqOsoGQIC+zKqSSklBZBX8UPdaBw/Abx4VpFW/m9X GrdpmB5MZ+80JHSR1DwFf+v+M9JYACC7Ve21sWkvrf+AbcHchSOv0zvCPx0TVTHwdl 1E+ZXw6GkVYBJfU5hfqglHdQunB5gKoi9NIbsxShwKGSlIkHPbN7upQmNHzsFTWYqw yu763Y1CcLtpg== Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org 1. Change v4l2 from get_user_pages(FOLL_LONGTERM), to pin_longterm_pages(), which sets both FOLL_LONGTERM and FOLL_PIN. 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(). Reviewed-by: Ira Weiny Cc: Mauro Carvalho Chehab Signed-off-by: John Hubbard --- drivers/media/v4l2-core/videobuf-dma-sg.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2= -core/videobuf-dma-sg.c index 28262190c3ab..9b9c5b37bf59 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 video= buf_dmabuf *dma, dprintk(1, "init user [0x%lx+0x%lx =3D> %d pages]\n", data, size, dma->nr_pages); =20 - err =3D get_user_pages(data & PAGE_MASK, dma->nr_pages, - flags | FOLL_LONGTERM, dma->pages, NULL); + err =3D pin_longterm_pages(data & PAGE_MASK, dma->nr_pages, + flags, dma->pages, NULL); =20 if (err !=3D dma->nr_pages) { dma->nr_pages =3D (err >=3D 0) ? err : 0; - dprintk(1, "get_user_pages: err=3D%d [%d]\n", err, + dprintk(1, "pin_longterm_pages: err=3D%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); =20 if (dma->pages) { - for (i =3D 0; i < dma->nr_pages; i++) { - if (dma->direction =3D=3D 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 =3D=3D DMA_FROM_DEVICE); kfree(dma->pages); dma->pages =3D NULL; } --=20 2.23.0