From patchwork Thu Dec 12 08:19:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Hubbard X-Patchwork-Id: 11287467 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 0F79714BD for ; Thu, 12 Dec 2019 08:22:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E1F672464B for ; Thu, 12 Dec 2019 08:22:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="IUVN9KAQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728559AbfLLIWU (ORCPT ); Thu, 12 Dec 2019 03:22:20 -0500 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:8609 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728369AbfLLIT2 (ORCPT ); Thu, 12 Dec 2019 03:19:28 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 12 Dec 2019 00:19:14 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 12 Dec 2019 00:19:21 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 12 Dec 2019 00:19:21 -0800 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 12 Dec 2019 08:19:20 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Thu, 12 Dec 2019 08:19:20 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Thu, 12 Dec 2019 00:19:20 -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 , Christoph Hellwig , Hans Verkuil , Subject: [PATCH v10 17/25] media/v4l2-core: set pages dirty upon releasing DMA buffers Date: Thu, 12 Dec 2019 00:19:09 -0800 Message-ID: <20191212081917.1264184-18-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191212081917.1264184-1-jhubbard@nvidia.com> References: <20191212081917.1264184-1-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=1576138755; bh=icmjko9fP8b/hMTtebs5M97o7j6aV8LjauIhhN3vqys=; 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=IUVN9KAQc/ua1UftCrMfxs6ic7rqDuo8saHSK0rOnt8QFL+p5U7xnLO4OWTcsJQ5g KzAB96enaN31aXkS8+f71s9ylBvpflj1Dqjmts4ESEaJJy4ux9T5NBoVJxTE30UJPs fgC5KcMrbPVqAbqApWQ6+6ZucWPambwU3ugVL5mUUZmTYOwjcfbPvc1RIp4ZSzno/g 95r3b/nua4VtY9hfFkWlDb4dIk6iWLOAPp9gTV3VcjoHFq6FUkXVU4hLY+rLUDmpy2 4BE8dgFLltoDsFS8fkBUbZUu/l4SUpoywark/5N9ORkKdUqAC2/X8rAJiToa+HjSur ihYzAG+jFQ+sg== Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org After DMA is complete, and the device and CPU caches are synchronized, it's still required to mark the CPU pages as dirty, if the data was coming from the device. However, this driver was just issuing a bare put_page() call, without any set_page_dirty*() call. Fix the problem, by calling set_page_dirty_lock() if the CPU pages were potentially receiving data from the device. Reviewed-by: Christoph Hellwig Acked-by: Hans Verkuil Cc: Mauro Carvalho Chehab Cc: Signed-off-by: John Hubbard --- drivers/media/v4l2-core/videobuf-dma-sg.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c index 66a6c6c236a7..28262190c3ab 100644 --- a/drivers/media/v4l2-core/videobuf-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf-dma-sg.c @@ -349,8 +349,11 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma) BUG_ON(dma->sglen); if (dma->pages) { - for (i = 0; i < dma->nr_pages; i++) + 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]); + } kfree(dma->pages); dma->pages = NULL; }