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[95.217.157.248]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5428becbc25sm2051761e87.259.2025.01.15.09.33.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jan 2025 09:33:19 -0800 (PST) References: <20250102-b4-rkisp-noncoherent-v1-1-bba164f7132c@gmail.com> <20250103152326.GP554@pendragon.ideasonboard.com> <87bjw9s4s3.fsf@gmail.com> <877c6wryqn.fsf@gmail.com> User-agent: mu4e 1.10.9; emacs 29.4.50 From: Mikhail Rudenko To: Tomasz Figa Cc: Laurent Pinchart , Dafna Hirschfeld , Mauro Carvalho Chehab , Heiko Stuebner , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] media: rkisp1: allow non-coherent video capture buffers Date: Wed, 15 Jan 2025 20:29:58 +0300 In-reply-to: Message-ID: <87y0zcq8wy.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-20250115_093322_629867_383E88B5 X-CRM114-Status: GOOD ( 21.66 ) 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 On 2025-01-15 at 23:46 +09, Tomasz Figa wrote: > On Wed, Jan 15, 2025 at 10:30=E2=80=AFPM Mikhail Rudenko wrote: >> >> Hi Tomasz, >> >> On 2025-01-15 at 17:31 +09, Tomasz Figa wrote: >> >> > Hi Mikhail and Laurent, >> > >> > On Wed, Jan 15, 2025 at 2:07=E2=80=AFAM Mikhail Rudenko wrote: >> >> >> >> >> >> Hi Laurent, >> >> >> >> On 2025-01-03 at 17:23 +02, Laurent Pinchart wrote: >> >> >> >> > On Thu, Jan 02, 2025 at 06:35:00PM +0300, Mikhail Rudenko wrote: >> >> >> Currently, the rkisp1 driver always uses coherent DMA allocations = for >> >> >> video capture buffers. However, on some platforms, using non-coher= ent >> >> >> buffers can improve performance, especially when CPU processing of >> >> >> MMAP'ed video buffers is required. >> >> >> >> >> >> For example, on the Rockchip RK3399 running at maximum CPU frequen= cy, >> >> >> the time to memcpy a frame from a 1280x720 XRGB32 MMAP'ed buffer t= o a >> >> >> malloc'ed userspace buffer decreases from 7.7 ms to 1.1 ms when us= ing >> >> >> non-coherent DMA allocation. CPU usage also decreases accordingly. >> >> > >> >> > What's the time taken by the cache management operations ? >> >> >> >> Sorry for the late reply, your question turned out a little more >> >> interesting than I expected initially. :) >> >> >> >> When capturing using Yavta with MMAP buffers under the conditions men= tioned >> >> in the commit message, ftrace gives 437.6 +- 1.1 us for >> >> dma_sync_sgtable_for_cpu and 409 +- 14 us for >> >> dma_sync_sgtable_for_device. Thus, it looks like using non-coherent >> >> buffers in this case is more CPU-efficient even when considering cache >> >> management overhead. >> >> >> >> When trying to do the same measurements with libcamera, I failed. In a >> >> typical libcamera use case when MMAP buffers are allocated from a >> >> device, exported as dmabufs and then used for capture on the same dev= ice >> >> with DMABUF memory type, cache management in kernel is skipped [1] >> >> [2]. Also, vb2_dc_dmabuf_ops_{begin,end}_cpu_access are no-ops [3], so >> >> DMA_BUF_IOCTL_SYNC from userspace does not work either. >> > >> > Oops, so I believe this is a bug. When an MMAP buffer is allocated in >> > the non-coherent mode, those ops should perform proper cache >> > maintenance. >> >> Thanks for pointing this out! >> >> > Let me send a patch to fix this in a couple of days unless someone >> > does it earlier. >> >> Now that we know that this is a bug, not an API misuse from my side, I >> can fix this myself and send a v2. Would this be okay for you? > > I'd be more than happy :) Done, see [1]. A review would be appreciated. :) [1] https://lore.kernel.org/all/20250115-b4-rkisp-noncoherent-v2-0-0853e1a2= 4012@gmail.com/ -- 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 B23BDC02180 for ; Wed, 15 Jan 2025 17:34:50 +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=Ay1GIGxWszyiwqGI49pFmV1KlgLXwG46HhgfE72vyZU=; b=uO9DFdmQSiPA7u s7zyYoit5bKytiDKlYNSHMMvaSjz+4sHtfbEOMDyGXyzGv3F1e35ou//1wAZiL5ZobxZ+MAKpVpm2 BeXQIZtCBHTCyfxEGFDnhWmjP70OY0bUSdQtTlJGkK/9aWOrRbeHYE7vFDNULzW2pmjbxv4dhpUHM EO25kE561Oimr+fsTbNTHZQILy9tWYiHHFCOdDxBaAthAg9UNpf4twPmbm64blby57QQboi5kkApx TQSI1KS+VIHP3Dw1/F6Y4MFU0NkPKmm+Wsf1oy2o0+dUEiIH5nF7H6IJ1r5CFBMI3+/3xDI+PYvz1 0+9iKzFR9vztO7M64t5g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tY7I0-0000000CcLX-0t3x; Wed, 15 Jan 2025 17:34:48 +0000 Received: from mail-lf1-x130.google.com ([2a00:1450:4864:20::130]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tY7Gc-0000000Cbze-2TeJ; Wed, 15 Jan 2025 17:33:23 +0000 Received: by mail-lf1-x130.google.com with SMTP id 2adb3069b0e04-54021daa6cbso51564e87.0; Wed, 15 Jan 2025 09:33:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1736962401; x=1737567201; 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=+tzwEHLf8s85+zyGb/tLCAPn4b62D9uaY7uMidIF++E=; b=LfAvVFcs36a+8f8BL7f4u2I8B3BwwrsX0WBWroJhooUm7kVcKOlXJZaKwB3KgEiEp9 b6DleeGU665IGeA61OuiFNlNEOXd1mVIHY8NyvJK4ofpObfJQrxYqr8xIIlGXwKVXhCi uvaWm30EgqgoVWoRs3H040oko0g8+vrGFA63EwUaah5s5o+cj56UQl/TYKEgs91l4rUb HH9uYwncMbT86VszzcaviYmpMj/wekMXw7TPD4ESRlF5uvGtChnILDolkF64MyYRsKNg UX+Gtd4eg4RxJD8Au+NDfJZEp492DaRdGV9MyqfPHFZ6MZ4jNUnaiSGAys6VjoAnJAtg nv7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736962401; x=1737567201; 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=+tzwEHLf8s85+zyGb/tLCAPn4b62D9uaY7uMidIF++E=; b=Eo1XOQDQYHpcMJAruENGJ1wloY60wVA1XoVUeT/9qFRZ0nZDZBbY4AMo2dHEJIpk4H pID6ml78e+l0tIImwvf+40jeEiWrF1O+SpTCLAOG5jduyvB8E6Pl/Pls0M1imqVS+h1n vGObeaqGb16v5xzeNwsX5MJW0QK6hMOMqoWuw7VKzay0IW/OEoGKjI3dVlRhSxEYqGt/ F4/NHDKV0ifOKHrA+ZjTxqa+CZ1HwN7ENkym8N2t6XUQRI5DdHR2wzvNeO7jj5PIHomn wpLc8qQilxvUwcr7M80VKZZ3VT8TuHy8cPS0Ght9dGojoT0fHBHkeQiocf2poRsig1Wz eHiw== X-Forwarded-Encrypted: i=1; AJvYcCVod/r6apidEzlPvO9Mbu97Kp0h6KBRzmbAIxl0lC8UzggGHd6WL+xZUQST349MrayTQPdR8Sonrnqdek6bFH0=@lists.infradead.org, AJvYcCXyXlx879YAm5mUuAWuW0cX8uuZaY+D6HIG32lv3QraFPP3dnUZwRiMmFtgkmLJjn1e8X70S0jSz1RBTId9qwm5@lists.infradead.org X-Gm-Message-State: AOJu0Yy2fanIuzfrVol4Oh/+TUuavU1vtbe0u0l5GJyZx+P8o+4F/89s mJQzCI+zgmwECHXO5D/1ssNY54cFTfImpEYIuQFhbSso1W9ae7xm X-Gm-Gg: ASbGnctt0G8hfH/588IcL7p8En3EKKgHYL988UvTJZhsp7F2WxldeYlXf94ZcMuu4qM l0/C5rcS7enZBCARzLup3R6HOdRCw90Z28Xhqip8aPAVlkjvsx7y2+DhQLYa3FUCui9yE8vzFMt jiQ7KeYIypuTwkcNlakhlDG8E7cNx+6jaQnRI0b9HeSrP0jc7ajwDoXkmQ1HFrCBB5uytMw5gey ehjSo50HXiHKULvfGDLHtS8PODZxJWuA7WGgUwVMnW9Wu3zndc/i8gCyaoEv6cB6EWy0WSE3TNA zsFffYVzIadI4K9jp1b6zftgDtWvhv8MZB0FBVw8blAI X-Google-Smtp-Source: AGHT+IHVuITnk6uWqJC7r+dQL/h3YFb1nzsnse5J2mvy5M+/MKpOzVH47aIYncz/G8LBHPMH6ccR4w== X-Received: by 2002:a05:6512:2246:b0:540:1e7e:ca80 with SMTP id 2adb3069b0e04-542845d35d9mr9465671e87.30.1736962400482; Wed, 15 Jan 2025 09:33:20 -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 2adb3069b0e04-5428becbc25sm2051761e87.259.2025.01.15.09.33.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Jan 2025 09:33:19 -0800 (PST) References: <20250102-b4-rkisp-noncoherent-v1-1-bba164f7132c@gmail.com> <20250103152326.GP554@pendragon.ideasonboard.com> <87bjw9s4s3.fsf@gmail.com> <877c6wryqn.fsf@gmail.com> User-agent: mu4e 1.10.9; emacs 29.4.50 From: Mikhail Rudenko To: Tomasz Figa Cc: Laurent Pinchart , Dafna Hirschfeld , Mauro Carvalho Chehab , Heiko Stuebner , linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] media: rkisp1: allow non-coherent video capture buffers Date: Wed, 15 Jan 2025 20:29:58 +0300 In-reply-to: Message-ID: <87y0zcq8wy.fsf@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250115_093322_629867_383E88B5 X-CRM114-Status: GOOD ( 21.66 ) 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; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org Ck9uIDIwMjUtMDEtMTUgYXQgMjM6NDYgKzA5LCBUb21hc3ogRmlnYSA8dGZpZ2FAY2hyb21pdW0u b3JnPiB3cm90ZToKCj4gT24gV2VkLCBKYW4gMTUsIDIwMjUgYXQgMTA6MzDigK9QTSBNaWtoYWls IFJ1ZGVua28gPG1pa2UucnVkZW5rb0BnbWFpbC5jb20+IHdyb3RlOgo+Pgo+PiBIaSBUb21hc3os Cj4+Cj4+IE9uIDIwMjUtMDEtMTUgYXQgMTc6MzEgKzA5LCBUb21hc3ogRmlnYSA8dGZpZ2FAY2hy b21pdW0ub3JnPiB3cm90ZToKPj4KPj4gPiBIaSBNaWtoYWlsIGFuZCBMYXVyZW50LAo+PiA+Cj4+ ID4gT24gV2VkLCBKYW4gMTUsIDIwMjUgYXQgMjowN+KAr0FNIE1pa2hhaWwgUnVkZW5rbyA8bWlr ZS5ydWRlbmtvQGdtYWlsLmNvbT4gd3JvdGU6Cj4+ID4+Cj4+ID4+Cj4+ID4+IEhpIExhdXJlbnQs Cj4+ID4+Cj4+ID4+IE9uIDIwMjUtMDEtMDMgYXQgMTc6MjMgKzAyLCBMYXVyZW50IFBpbmNoYXJ0 IDxsYXVyZW50LnBpbmNoYXJ0QGlkZWFzb25ib2FyZC5jb20+IHdyb3RlOgo+PiA+Pgo+PiA+PiA+ IE9uIFRodSwgSmFuIDAyLCAyMDI1IGF0IDA2OjM1OjAwUE0gKzAzMDAsIE1pa2hhaWwgUnVkZW5r byB3cm90ZToKPj4gPj4gPj4gQ3VycmVudGx5LCB0aGUgcmtpc3AxIGRyaXZlciBhbHdheXMgdXNl cyBjb2hlcmVudCBETUEgYWxsb2NhdGlvbnMgZm9yCj4+ID4+ID4+IHZpZGVvIGNhcHR1cmUgYnVm ZmVycy4gSG93ZXZlciwgb24gc29tZSBwbGF0Zm9ybXMsIHVzaW5nIG5vbi1jb2hlcmVudAo+PiA+ PiA+PiBidWZmZXJzIGNhbiBpbXByb3ZlIHBlcmZvcm1hbmNlLCBlc3BlY2lhbGx5IHdoZW4gQ1BV IHByb2Nlc3Npbmcgb2YKPj4gPj4gPj4gTU1BUCdlZCB2aWRlbyBidWZmZXJzIGlzIHJlcXVpcmVk Lgo+PiA+PiA+Pgo+PiA+PiA+PiBGb3IgZXhhbXBsZSwgb24gdGhlIFJvY2tjaGlwIFJLMzM5OSBy dW5uaW5nIGF0IG1heGltdW0gQ1BVIGZyZXF1ZW5jeSwKPj4gPj4gPj4gdGhlIHRpbWUgdG8gbWVt Y3B5IGEgZnJhbWUgZnJvbSBhIDEyODB4NzIwIFhSR0IzMiBNTUFQJ2VkIGJ1ZmZlciB0byBhCj4+ ID4+ID4+IG1hbGxvYydlZCB1c2Vyc3BhY2UgYnVmZmVyIGRlY3JlYXNlcyBmcm9tIDcuNyBtcyB0 byAxLjEgbXMgd2hlbiB1c2luZwo+PiA+PiA+PiBub24tY29oZXJlbnQgRE1BIGFsbG9jYXRpb24u IENQVSB1c2FnZSBhbHNvIGRlY3JlYXNlcyBhY2NvcmRpbmdseS4KPj4gPj4gPgo+PiA+PiA+IFdo YXQncyB0aGUgdGltZSB0YWtlbiBieSB0aGUgY2FjaGUgbWFuYWdlbWVudCBvcGVyYXRpb25zID8K Pj4gPj4KPj4gPj4gU29ycnkgZm9yIHRoZSBsYXRlIHJlcGx5LCB5b3VyIHF1ZXN0aW9uIHR1cm5l ZCBvdXQgYSBsaXR0bGUgbW9yZQo+PiA+PiBpbnRlcmVzdGluZyB0aGFuIEkgZXhwZWN0ZWQgaW5p dGlhbGx5LiA6KQo+PiA+Pgo+PiA+PiBXaGVuIGNhcHR1cmluZyB1c2luZyBZYXZ0YSB3aXRoIE1N QVAgYnVmZmVycyB1bmRlciB0aGUgY29uZGl0aW9ucyBtZW50aW9uZWQKPj4gPj4gaW4gdGhlIGNv bW1pdCBtZXNzYWdlLCBmdHJhY2UgZ2l2ZXMgNDM3LjYgKy0gMS4xIHVzIGZvcgo+PiA+PiBkbWFf c3luY19zZ3RhYmxlX2Zvcl9jcHUgYW5kIDQwOSArLSAxNCB1cyBmb3IKPj4gPj4gZG1hX3N5bmNf c2d0YWJsZV9mb3JfZGV2aWNlLiBUaHVzLCBpdCBsb29rcyBsaWtlIHVzaW5nIG5vbi1jb2hlcmVu dAo+PiA+PiBidWZmZXJzIGluIHRoaXMgY2FzZSBpcyBtb3JlIENQVS1lZmZpY2llbnQgZXZlbiB3 aGVuIGNvbnNpZGVyaW5nIGNhY2hlCj4+ID4+IG1hbmFnZW1lbnQgb3ZlcmhlYWQuCj4+ID4+Cj4+ ID4+IFdoZW4gdHJ5aW5nIHRvIGRvIHRoZSBzYW1lIG1lYXN1cmVtZW50cyB3aXRoIGxpYmNhbWVy YSwgSSBmYWlsZWQuIEluIGEKPj4gPj4gdHlwaWNhbCBsaWJjYW1lcmEgdXNlIGNhc2Ugd2hlbiBN TUFQIGJ1ZmZlcnMgYXJlIGFsbG9jYXRlZCBmcm9tIGEKPj4gPj4gZGV2aWNlLCBleHBvcnRlZCBh cyBkbWFidWZzIGFuZCB0aGVuIHVzZWQgZm9yIGNhcHR1cmUgb24gdGhlIHNhbWUgZGV2aWNlCj4+ ID4+IHdpdGggRE1BQlVGIG1lbW9yeSB0eXBlLCBjYWNoZSBtYW5hZ2VtZW50IGluIGtlcm5lbCBp cyBza2lwcGVkIFsxXQo+PiA+PiBbMl0uIEFsc28sIHZiMl9kY19kbWFidWZfb3BzX3tiZWdpbixl bmR9X2NwdV9hY2Nlc3MgYXJlIG5vLW9wcyBbM10sIHNvCj4+ID4+IERNQV9CVUZfSU9DVExfU1lO QyBmcm9tIHVzZXJzcGFjZSBkb2VzIG5vdCB3b3JrIGVpdGhlci4KPj4gPgo+PiA+IE9vcHMsIHNv IEkgYmVsaWV2ZSB0aGlzIGlzIGEgYnVnLiBXaGVuIGFuIE1NQVAgYnVmZmVyIGlzIGFsbG9jYXRl ZCBpbgo+PiA+IHRoZSBub24tY29oZXJlbnQgbW9kZSwgdGhvc2Ugb3BzIHNob3VsZCBwZXJmb3Jt IHByb3BlciBjYWNoZQo+PiA+IG1haW50ZW5hbmNlLgo+Pgo+PiBUaGFua3MgZm9yIHBvaW50aW5n IHRoaXMgb3V0IQo+Pgo+PiA+IExldCBtZSBzZW5kIGEgcGF0Y2ggdG8gZml4IHRoaXMgaW4gYSBj b3VwbGUgb2YgZGF5cyB1bmxlc3Mgc29tZW9uZQo+PiA+IGRvZXMgaXQgZWFybGllci4KPj4KPj4g Tm93IHRoYXQgd2Uga25vdyB0aGF0IHRoaXMgaXMgYSBidWcsIG5vdCBhbiBBUEkgbWlzdXNlIGZy b20gbXkgc2lkZSwgSQo+PiBjYW4gZml4IHRoaXMgbXlzZWxmIGFuZCBzZW5kIGEgdjIuIFdvdWxk IHRoaXMgYmUgb2theSBmb3IgeW91Pwo+Cj4gSSdkIGJlIG1vcmUgdGhhbiBoYXBweSA6KQoKRG9u ZSwgc2VlIFsxXS4gQSByZXZpZXcgd291bGQgYmUgYXBwcmVjaWF0ZWQuIDopCgpbMV0gaHR0cHM6 Ly9sb3JlLmtlcm5lbC5vcmcvYWxsLzIwMjUwMTE1LWI0LXJraXNwLW5vbmNvaGVyZW50LXYyLTAt MDg1M2UxYTI0MDEyQGdtYWlsLmNvbS8KCgotLQpCZXN0IHJlZ2FyZHMsCk1pa2hhaWwgUnVkZW5r bwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KTGludXgt cm9ja2NoaXAgbWFpbGluZyBsaXN0CkxpbnV4LXJvY2tjaGlwQGxpc3RzLmluZnJhZGVhZC5vcmcK aHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1yb2NrY2hp cAo=