From patchwork Fri Oct 9 07:59:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11825205 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 C08A4175A for ; Fri, 9 Oct 2020 08:00:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 76691222B8 for ; Fri, 9 Oct 2020 08:00:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="X+lVFEzk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76691222B8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6A5066B0078; Fri, 9 Oct 2020 04:00:09 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 65BBC6B007B; Fri, 9 Oct 2020 04:00:09 -0400 (EDT) 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 4CECA6B007D; Fri, 9 Oct 2020 04:00:09 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0078.hostedemail.com [216.40.44.78]) by kanga.kvack.org (Postfix) with ESMTP id 21A256B0078 for ; Fri, 9 Oct 2020 04:00:09 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id AD8191EE6 for ; Fri, 9 Oct 2020 08:00:08 +0000 (UTC) X-FDA: 77351638896.02.unit02_5f04047271df Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 7D6AC101ADE97 for ; Fri, 9 Oct 2020 08:00:08 +0000 (UTC) X-Spam-Summary: 1,0,0,ff1bdde3660334cc,d41d8cd98f00b204,daniel.vetter@ffwll.ch,,RULES_HIT:41:152:355:379:541:800:960:973:988:989:1260:1277:1311:1313:1314:1345:1359:1431:1437:1515:1516:1518:1535:1542:1593:1594:1711:1730:1747:1777:1792:2194:2198:2199:2200:2393:2553:2559:2562:2693:3138:3139:3140:3141:3142:3353:3865:3867:3868:3871:3874:4117:4321:5007:6261:6653:6742:6743:8603:9036:10004:10400:11026:11657:11658:11914:12043:12296:12297:12438:12517:12519:12555:12895:13161:13229:13846:13894:14181:14394:14659:14721:14819:21080:21444:21451:21627:21740:21773:30054:30064:30090,0,RBL:209.85.221.66:@ffwll.ch:.lbl8.mailshell.net-66.201.201.201 62.8.0.100;04yfqhc9mh35gsyxoisc4qks3t9jdyc1cwqhhyhqaqai4mpemxwc3ni4jkfqdmk.mefzmn7o7n61d6pro7fi3s6o53jwiqrbgxnan5mxo7yp8p7zc65bz1j7e811prr.h-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:25,LUA_SUMMARY:none X-HE-Tag: unit02_5f04047271df X-Filterd-Recvd-Size: 6332 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Fri, 9 Oct 2020 08:00:07 +0000 (UTC) Received: by mail-wr1-f66.google.com with SMTP id n15so9249933wrq.2 for ; Fri, 09 Oct 2020 01:00:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=N5MezEhvq/wwBRTty0X109hZVMwHizCfP5Lc200+OeU=; b=X+lVFEzkJG7G1y1hQOMHpq9aH/9wMcZRASu3pf5WwWkSy+lBQfhcJFHkD+mB+HB+8B 6q3Z/oFWS+IjpKniri9mdKD+xWh4Pb1kxxRnhtmA75fRmXM2leSVVQ9O6mzJ2s2pjdNF FwYvxU8GuH0ylVTYs9gfzX5C6vRDllxk8cWjE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=N5MezEhvq/wwBRTty0X109hZVMwHizCfP5Lc200+OeU=; b=BjP5TQNcmXc8jGYeX/U7Uelg0XLOhDVmlmD4h/k2mD0gMwCp+bQCr5xHVy5wWiO9cf ZHUQL/SaJSUkp7lPZaEKYsnepUHoezO4iydxvPtPmSAyzl1mBNwiI71vS5YvQ+x2JUHo 0GPMjnt4SkWC4FluZIou3ZIjuSwCyVL9eRT+HLB8za8g4B+8XkddtdVQQnGolFL6SBW5 FGPFKDcGtnyOK1TLt5XmhXsrz7+SaWZrLNoDfibViOUmGGsBXlWYhFBNzQISS7Zx4k7q ZdFdPopS15p3Gvp4bH13gTiZd+s8Yrioqf57LFKh1oynMz7+Ahdd4H3TW4Ax8uBtJnui X/3A== X-Gm-Message-State: AOAM532Of6b56oDXXqlaFAKhkpPFsun1foglstjxG5tSY3PV+evAsqK2 vVnYQXo7xiNOfd5F2NbFkfQqbQ== X-Google-Smtp-Source: ABdhPJzMUouKiCH6SJK6dyAVSQS46IBJV9EJgv/XkHUvyqgT9BYelO/ICRgl0rBnswqZFheeRzPOMA== X-Received: by 2002:adf:9dd1:: with SMTP id q17mr6771139wre.317.1602230406671; Fri, 09 Oct 2020 01:00:06 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id u17sm11634118wri.45.2020.10.09.01.00.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 01:00:05 -0700 (PDT) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Pawel Osciak , Marek Szyprowski , Kyungmin Park , Tomasz Figa , Laurent Dufour , Vlastimil Babka , Daniel Jordan , Michel Lespinasse Subject: [PATCH v2 10/17] media/videbuf1|2: Mark follow_pfn usage as unsafe Date: Fri, 9 Oct 2020 09:59:27 +0200 Message-Id: <20201009075934.3509076-11-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> References: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 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: The media model assumes that buffers are all preallocated, so that when a media pipeline is running we never miss a deadline because the buffers aren't allocated or available. This means we cannot fix the v4l follow_pfn usage through mmu_notifier, without breaking how this all works. The only real fix is to deprecate userptr support for VM_IO | VM_PFNMAP mappings and tell everyone to cut over to dma-buf memory sharing for zerocopy. userptr for normal memory will keep working as-is. Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Pawel Osciak Cc: Marek Szyprowski Cc: Kyungmin Park Cc: Tomasz Figa Cc: Laurent Dufour Cc: Vlastimil Babka Cc: Daniel Jordan Cc: Michel Lespinasse --- drivers/media/common/videobuf2/frame_vector.c | 2 +- drivers/media/v4l2-core/videobuf-dma-contig.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/common/videobuf2/frame_vector.c b/drivers/media/common/videobuf2/frame_vector.c index 2b0b97761d15..a1b85fe9e7c1 100644 --- a/drivers/media/common/videobuf2/frame_vector.c +++ b/drivers/media/common/videobuf2/frame_vector.c @@ -69,7 +69,7 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, break; while (ret < nr_frames && start + PAGE_SIZE <= vma->vm_end) { - err = follow_pfn(vma, start, &nums[ret]); + err = unsafe_follow_pfn(vma, start, &nums[ret]); if (err) { if (ret == 0) ret = err; diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c index 52312ce2ba05..821c4a76ab96 100644 --- a/drivers/media/v4l2-core/videobuf-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf-dma-contig.c @@ -183,7 +183,7 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, user_address = untagged_baddr; while (pages_done < (mem->size >> PAGE_SHIFT)) { - ret = follow_pfn(vma, user_address, &this_pfn); + ret = unsafe_follow_pfn(vma, user_address, &this_pfn); if (ret) break;