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[95.217.157.248]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5495b3f4ebdsm1155605e87.102.2025.03.04.23.53.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 23:53:40 -0800 (PST) References: <20250303-b4-rkisp-noncoherent-v4-0-e32e843fb6ef@gmail.com> <20250303-b4-rkisp-noncoherent-v4-1-e32e843fb6ef@gmail.com> <8b3dac7baed1de9542452547454c53188c384391.camel@ndufresne.ca> User-agent: mu4e 1.10.9; emacs 30.1 From: Mikhail Rudenko To: Nicolas Dufresne Cc: Dafna Hirschfeld , Laurent Pinchart , Mauro Carvalho Chehab , Heiko Stuebner , Tomasz Figa , Marek Szyprowski , Hans Verkuil , Sergey Senozhatsky , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , stable@vger.kernel.org Subject: Re: [PATCH v4 1/2] media: videobuf2: Fix dmabuf cache sync/flush in dma-contig Date: Wed, 05 Mar 2025 10:40:31 +0300 In-reply-to: <8b3dac7baed1de9542452547454c53188c384391.camel@ndufresne.ca> Message-ID: <87y0xj29rz.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250304_235343_633942_2AB62DB6 X-CRM114-Status: GOOD ( 20.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Nicolas, On 2025-03-03 at 10:24 -05, Nicolas Dufresne wrote: > Hi Mikhail, > > Le lundi 03 mars 2025 =C3=A0 14:40 +0300, Mikhail Rudenko a =C3=A9crit=C2= =A0: >> When support for V4L2_FLAG_MEMORY_NON_CONSISTENT was removed in >> commit 129134e5415d ("media: media/v4l2: remove >> V4L2_FLAG_MEMORY_NON_CONSISTENT flag"), >> vb2_dc_dmabuf_ops_{begin,end}_cpu_access() functions were made >> no-ops. Later, when support for V4L2_MEMORY_FLAG_NON_COHERENT was >> introduced in commit c0acf9cfeee0 ("media: videobuf2: handle >> V4L2_MEMORY_FLAG_NON_COHERENT flag"), the above functions remained >> no-ops, making cache maintenance for non-coherent dmabufs allocated >> by >> dma-contig impossible. >> >> Fix this by reintroducing dma_sync_sgtable_for_{cpu,device} and >> {flush,invalidate}_kernel_vmap_range calls to >> vb2_dc_dmabuf_ops_{begin,end}_cpu_access() functions for non-coherent >> buffers. >> >> Fixes: c0acf9cfeee0 ("media: videobuf2: handle >> V4L2_MEMORY_FLAG_NON_COHERENT flag") >> Cc: stable@vger.kernel.org >> Signed-off-by: Mikhail Rudenko >> --- >> =C2=A0.../media/common/videobuf2/videobuf2-dma-contig.c=C2=A0 | 22 >> ++++++++++++++++++++++ >> =C2=A01 file changed, 22 insertions(+) >> >> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c >> b/drivers/media/common/videobuf2/videobuf2-dma-contig.c >> index >> a13ec569c82f6da2d977222b94af32e74c6c6c82..d41095fe5bd21faf815d6b035d7 >> bc888a84a95d5 100644 >> --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c >> +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c >> @@ -427,6 +427,17 @@ static int >> =C2=A0vb2_dc_dmabuf_ops_begin_cpu_access(struct dma_buf *dbuf, >> =C2=A0 =C2=A0=C2=A0 enum dma_data_direction >> direction) >> =C2=A0{ >> + struct vb2_dc_buf *buf =3D dbuf->priv; >> + struct sg_table *sgt =3D buf->dma_sgt; >> + >> + if (!buf->non_coherent_mem) >> + return 0; >> + >> + if (buf->vaddr) >> + invalidate_kernel_vmap_range(buf->vaddr, buf->size); > > What would make me a lot more confortable with this change is if you > enable kernel mappings for one test. This will ensure you cover the > call to "invalidate" in your testing. I'd like to know about the > performance impact. With this implementation it should be identical to > the VB2 one. I'll enable kernel mappings and rerun my tests later this week. > What I was trying to say in previous comments, is that my impression is > that we can skip this for CPU read access, since we don't guaranty > concurrent access anyway. Both address space can keep their cache in > that case. Though, I see RKISP does not use kernel mapping plus I'm not > reporting a bug, but checking if we should leave a comment for possible > users of kernel mapping in the future ? I trust Tomasz here, I'd wait for his comment on v4. >> + >> + dma_sync_sgtable_for_cpu(buf->dev, sgt, direction); >> + >> =C2=A0 return 0; >> =C2=A0} >> >> @@ -434,6 +445,17 @@ static int >> =C2=A0vb2_dc_dmabuf_ops_end_cpu_access(struct dma_buf *dbuf, >> =C2=A0 enum dma_data_direction direction) >> =C2=A0{ >> + struct vb2_dc_buf *buf =3D dbuf->priv; >> + struct sg_table *sgt =3D buf->dma_sgt; >> + >> + if (!buf->non_coherent_mem) >> + return 0; >> + >> + if (buf->vaddr) >> + flush_kernel_vmap_range(buf->vaddr, buf->size); >> + >> + dma_sync_sgtable_for_device(buf->dev, sgt, direction); >> + >> =C2=A0 return 0; >> =C2=A0} >> >> -- Best regards, Mikhail Rudenko 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8BD41C282D3 for ; Wed, 5 Mar 2025 09:15:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:In-reply-to: Date:Subject:Cc:To:From:References:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=crddsP/AKGjp2Y2tr3+u2Hd5wzzRsm+cY2QMRxCPN1I=; b=LhdDDOuh94/G99 R/ADrPqU5Qitbn3J+9ZKhBhHDo6zswWSasLzf9a6DNgq3+zRa7BN6fkiqTO79hK0oMnTLxph1bsti VE88CF5tXlppMxWdtr5Qz0S5KuyPETtwnBydRHiU6NeaaL/D+swkKqWWQhxIE7+ZgBHSbcz98vWR8 xIHeaEX2Q2Z2Dj5d4ulc3iOxbSxgZW836qiMRnjFBNCrRUGnwfx6Ny9u52rJ2d2yevmNSOtsIKAYR v+zujFkrN7g7XcoUMDObMb//PS4rjLfCAPkhvF8370KuJeuaCSUYPLVq3MVbWXfk9qXZzCPScDiFx AW4wOE+AFBzOFRk4TJoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tpkq7-00000007TmH-1yLl; Wed, 05 Mar 2025 09:14:55 +0000 Received: from mail-lf1-x12c.google.com ([2a00:1450:4864:20::12c]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tpjZX-00000007IHN-2VRe; Wed, 05 Mar 2025 07:53:44 +0000 Received: by mail-lf1-x12c.google.com with SMTP id 2adb3069b0e04-54954fa61c8so5306325e87.1; Tue, 04 Mar 2025 23:53:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1741161221; x=1741766021; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:in-reply-to:date :subject:cc:to:from:user-agent:references:from:to:cc:subject:date :message-id:reply-to; bh=HiTpS6soFncX3ap+JUlkCx1cOPiDwgUNOLW0huS1jJo=; b=G7oOLH3zeugRFmagiKpNE5xYgbj6zWgt8ne1KZTM6pSuVQ5EzoxAJ12Y363yRNrpoZ Sqrvb3++EM2HYW4d57wp+wWHZuVmqZtlrQKi4P5ZPvroZoGKoRH/KluhqyXOwODjQn3L M4NjKNYtETf1O7J31vDvgG6oUQAf+f+6gFBA9y4GKh88kt3RfFNX4jUUVbl2fafXk2uF necHLJVVlDGWkYynOnEmVpf5LBLCwDAy7azBGdLDTZbDJMoO7hmNrevac4GCgxLU7HWD UPilOwAosOs6J6lUusqAWfs+X0k9wmA+53lHSmeuMAcEOzI7B1NEJlRexzS7PNs2iw1q hL8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741161221; x=1741766021; h=content-transfer-encoding:mime-version:message-id:in-reply-to:date :subject:cc:to:from:user-agent:references:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=HiTpS6soFncX3ap+JUlkCx1cOPiDwgUNOLW0huS1jJo=; b=KAlortb2tYpo+RSEf0RJ8e5dyVN0dE0+RuL/0hy/qipk5v7QADAmgnpIWC4icDzxOa l2Y2N2Zy+Q3PdzDzBL/85AVEGleio4Ca9ts8XMQErpuTK/l2hrZYVeDp4SD2MP4euIl/ htkC5cMA5uDQqls5UK1YuNClMaz6eZdzLIBIKCcul50P7PYiV6RUU5fM9A1g/e/6TLcx pbLLvP9J2t6nj1jtCu7qk8YqtEPC4Y2D6jE2agDDi8Iz45mo2t7cGoFcaUQUn7nc+GhF ht+Yduf92xXv8ZlawOfPLWHzQmo/k58lHd+t5ykstNzEOMQCUxZtQyjHdwSs6NukDkv4 0Uig== X-Forwarded-Encrypted: i=1; AJvYcCW/WxL+whbTKAj1XONuVydBpeqiHHGWOKCGHTSFFf4nb+S2NXUgQUXbS7qBz51bBMaZCgdlqEghg4HCo/r5/P+C@lists.infradead.org, AJvYcCX+Cc2V0fob4FjQJhQKE0bqRSeYenfotbCMDNj73RDOcLxpHzi2/4sGX7lT05nwtwAokunrnzaNMkns92tG7oQ=@lists.infradead.org X-Gm-Message-State: AOJu0Yw6qxWvQ2cGuFF3DOm9SVCIMtDWcQJT+dhd1W2688sAtqT5LTDi uLUPjNahX0mfxZNseMGacdU6DR7gB0J5Tcp9g7A23QM+zHRj3sRq X-Gm-Gg: ASbGnct6q38pBVyEC75GhpbXE9+NmQJiHTdr03P97hqDl+V7GIh9rh9S45nmoGdO3MU L16oEImdKFRfwWDx1cUcetwfm28VFDcZLhX3zDIogh79ePmnqWZNFuyym8Qdbw6OeZCz+RWOAxG nwV7qzogXQun8mR34u++auAn6o5Crix+sQUSbdlcD6bOWwuSANwzaD/KdkmS0kgPXN+IHNZGpQd ktuJfT5ZvxaabdxCX2t9UX8OgchFeBH5aATw+47uLVGVgtM7Jar8H7viasPRvirAvwFGWL/ii55 FPJcF1NyjTJzYTs0Vy+tNBNhGXk4oInP6LJLg2mhiJlbKo2PnpUx1hvrG55eGCVd/Jt2ml2iSYN 0ucRWER4wbVTbSh1p0FTmKyTnUiyqLAFB X-Google-Smtp-Source: AGHT+IGoSfXFo2jQfX6zwJukiQLZftqM9VYE26ir2v2Z98LPwA2YNZbRZg8LePVsUKETExIau4wjew== X-Received: by 2002:a05:6512:3190:b0:549:7c64:3bc0 with SMTP id 2adb3069b0e04-5497d35028emr565104e87.29.1741161221096; Tue, 04 Mar 2025 23:53:41 -0800 (PST) Received: from razdolb (static.248.157.217.95.clients.your-server.de. [95.217.157.248]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5495b3f4ebdsm1155605e87.102.2025.03.04.23.53.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Mar 2025 23:53:40 -0800 (PST) References: <20250303-b4-rkisp-noncoherent-v4-0-e32e843fb6ef@gmail.com> <20250303-b4-rkisp-noncoherent-v4-1-e32e843fb6ef@gmail.com> <8b3dac7baed1de9542452547454c53188c384391.camel@ndufresne.ca> User-agent: mu4e 1.10.9; emacs 30.1 From: Mikhail Rudenko To: Nicolas Dufresne Cc: Dafna Hirschfeld , Laurent Pinchart , Mauro Carvalho Chehab , Heiko Stuebner , Tomasz Figa , Marek Szyprowski , Hans Verkuil , Sergey Senozhatsky , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , stable@vger.kernel.org Subject: Re: [PATCH v4 1/2] media: videobuf2: Fix dmabuf cache sync/flush in dma-contig Date: Wed, 05 Mar 2025 10:40:31 +0300 In-reply-to: <8b3dac7baed1de9542452547454c53188c384391.camel@ndufresne.ca> Message-ID: <87y0xj29rz.fsf@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250304_235343_633942_2AB62DB6 X-CRM114-Status: GOOD ( 20.35 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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