From patchwork Sun Nov 29 03:15:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Senozhatsky X-Patchwork-Id: 334585 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 6C2FFC64E7D for ; Sun, 29 Nov 2020 03:17:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 15752206CA for ; Sun, 29 Nov 2020 03:17:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="TFfMQNP1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726021AbgK2DQt (ORCPT ); Sat, 28 Nov 2020 22:16:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725839AbgK2DQs (ORCPT ); Sat, 28 Nov 2020 22:16:48 -0500 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E41FC0613D1; Sat, 28 Nov 2020 19:16:08 -0800 (PST) Received: by mail-pg1-x544.google.com with SMTP id k11so7556441pgq.2; Sat, 28 Nov 2020 19:16:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=4oxlPetDGevWx8+PQ3DS/1BMJ6iQVMJPTwtu8ujLY9A=; b=TFfMQNP1P/S3YgjCDCeHh71YYglw/gd4jOOyJlZImA7y0RPlDyPccwu4w1acxobGs7 uq+eyld/IVrlg1y/O87Qzp4aDodrJvB9llrU+yrz+5OcEsH137O2RvTHP5eqJW+MYSLO hRp2/zUO45VrG8HUgehYLpcQZhXYt5Ca3Uv0dYa0Y5KxMLN8iccxnu1ShwmBC2Q+LbCG CWJPKXvAyAtjUysv900cfGsyqgytkgl1Rh58HT5Ac+u8O23qn4woRrpVT5BeO0D+xXAp llL2PmfvzScfiUtPAigXWcUbb9pBr7jZDRyVtjtxiWjs7NbIxGYrQBuBaYoTLbEKPB1n 74Lg== 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:mime-version :content-transfer-encoding; bh=4oxlPetDGevWx8+PQ3DS/1BMJ6iQVMJPTwtu8ujLY9A=; b=NGQvOMn5JAYKIjbvD3rxCbAd3qV2E3A+jI4JJTeh3OYsoMv7n5lfT3CK6Ylk13GjBp IpjgZ7eHYE+SOxRESKXxuP0uGYnOqPqYBzVEUXDU4utK8wv0HS6Op0cFt9cwNqHQ5j6r aN1FVFzuC4+1wcHoV0Kr3DRhfyVcFXWn9RSKf2ZY0RzqUNNzdHZETT3X0MH83qK2KM6q cIgbmw11NO4TXTO23AxfcMflTYdMIhukO0svgyU3/Inx49QTOyrObx/k1t8aUphSuXGV eO/6WocFoZkYFAlmt53c21XTsU5C4+On88uB/YoW2lKN/I+YaoXYGRumgXmKj1CDEnYs e7EQ== X-Gm-Message-State: AOAM532npDykgh4/0tG9OUjcq2FuAwgOoxpMoqgeKjOxrxdSAGPl5x9r QnA07p76eY8A+20Sp1WGG/4= X-Google-Smtp-Source: ABdhPJwVPgU5BbOpeTTgEl5gFr/10QrTtdq3OMFltN/wju6Id6EufrlFsZSTvTJ3QsdzcCJLN3TmBw== X-Received: by 2002:a17:90a:c092:: with SMTP id o18mr6218541pjs.141.1606619767967; Sat, 28 Nov 2020 19:16:07 -0800 (PST) Received: from localhost.localdomain ([2409:10:2e40:5100:6e29:95ff:fe2d:8f34]) by smtp.gmail.com with ESMTPSA id q200sm11895156pfq.95.2020.11.28.19.16.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Nov 2020 19:16:06 -0800 (PST) From: Sergey Senozhatsky To: Hans Verkuil , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky , Sergey Senozhatsky Subject: [PATCHv3] media: vb2: always set buffer cache sync hints Date: Sun, 29 Nov 2020 12:15:45 +0900 Message-Id: <20201129031545.557586-1-sergey.senozhatsky@gmail.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org We need to always set ->need_cache_sync_on_prepare and ->need_cache_sync_on_finish when we initialize vb2 buffer. Currently these flags are set/adjusted only in V4L2's vb2_queue_or_prepare_buf(), which means that for the code paths that don't use V4L2 vb2 will always tell videobuf2 core to skip ->prepare() and ->finish() cache syncs/flushes. This is a quick solution that should do the trick. The proper fix, however, is much more complicated and requires a rather big videobuf2 refactoring - we need to move cache sync/flush decision making out of core videobuf2 to the allocators. Fixes: f5f5fa73fbfb ("media: videobuf2: handle V4L2 buffer cache flags") Reported-by: Tomasz Figa Signed-off-by: Sergey Senozhatsky --- drivers/media/common/videobuf2/videobuf2-core.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) v3: Improved code comment and dropped queue allow_cache_hints check (Tomasz) v2: Added a comment and set cache sync flags only for specific buffers (Hans) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 5499013cf82e..3f11fc5b5d9a 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -414,6 +414,20 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, vb->index = q->num_buffers + buffer; vb->type = q->type; vb->memory = memory; + /* + * A workaround fix. We need to set these flags here so that + * videobuf2 core will call ->prepare()/->finish() cache + * sync/flush on vb2 buffers when appropriate. Otherwise, for + * backends that don't rely on V4L2 (perhaps dvb) these flags + * will always be false and, hence, videobuf2 core will skip + * cache sync/flush operations. However, we can avoid explicit + * ->prepare() and ->finish() cache sync for DMABUF buffers, + * because DMA exporter takes care of it. + */ + if (q->memory != VB2_MEMORY_DMABUF) { + vb->need_cache_sync_on_prepare = 1; + vb->need_cache_sync_on_finish = 1; + } for (plane = 0; plane < num_planes; ++plane) { vb->planes[plane].length = plane_sizes[plane]; vb->planes[plane].min_length = plane_sizes[plane];