From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 916E53E6398; Fri, 10 Jul 2026 22:47:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783723624; cv=none; b=bW7tz7sx6CP+SVF5e4Seqtaipz3tz1F9JFSTWoC26si4Vwuj8Xml110+DuL69WQFiKv80NUi+nG+wd28lRwW02KUNkFS1f13x9t4ei5+W9AxbdnZA1LKnASzdXI60TRYxrQKkT9eDTaIeWJBdS9MDHIqapWifpUxP3u3rMStV+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783723624; c=relaxed/simple; bh=NimeqggcOy84sPZGIqQcP3Qxa7Ey1uP/p0eOORACkCU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=YNo0k8XFPNIb/teeA7itIG0fiNz98+EgErukVkh5o/BpHp8FDOwb5YFIoedSCaJbXcpnG4p1/w4//AEDOCRucxx8l26ECEmNqODzYix2oIEqA2Cv/qN+ldD9ARwogCng8Z5s/RBZq/7TDKqE0g0uYyU1X2ELe80jtMM5SuQzTLg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fE4uogoL; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fE4uogoL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CDF441F00A3D; Fri, 10 Jul 2026 22:46:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783723623; bh=FgFvniYBK8vDGLtPIx4BCHD74yzF4yY17gWq7XVt4RY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=fE4uogoLpX0KIjnaIakvou7bqbvo/vkR1mtvPThSRqOhg7tE6fsKv2V8eMr25raPL qy6O19WsZ+l2btioUE/MiH2kF51AIplfIgbY+DTtmL+v7criXXkVtj8kKz8eFGPa0R O9hVaqGGldg3ooZtSgb3UUksmIuuvMnunimxnceLHXRU6k0KvTNr5tB5zWRkTf1mdS Ko+yo9WYD7w6S57v5LjgFlBaPMVgEhSdjUwhV1u0Pmb8Q/7emoPQQTic3eiJWmUZ6G U57OOn6PqPUsZNl+9fDOTNsDwKghR5TIIZj1gqsRa4jjUeDJUHBPnuAYjnQAGL61hL D7Vsv31hbsWJg== Message-ID: <5c8af0d5-2477-48ca-bd7c-0f2475a9dd62@kernel.org> Date: Fri, 10 Jul 2026 23:46:58 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 07/11] arm64: dts: qcom: hamoa: Move Iris IOMMUs to sub nodes To: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vishnu Reddy References: <20260709-vpu_iommu_iova_handling-v1-0-72bb62cb2dfd@oss.qualcomm.com> <63t_fLehIKEom4-JPN9kAGFEjUG4_yFoHMhB2aEAppwPHb2oPbK666eGkGgXxEAHRJnfTRRUwuf2EqNRYe_gjA==@protonmail.internalid> <20260709-vpu_iommu_iova_handling-v1-7-72bb62cb2dfd@oss.qualcomm.com> From: Bryan O'Donoghue Content-Language: en-GB Autocrypt: addr=bod@kernel.org; keydata= xsFNBGRJNSgBEADD7Vm2ZFa+v+JGJ2QYTJqQAkqis/uOHkhdFNXqpBarVBd47QU/DMNU5Rxg jedMQEmHoeDbJ6UOpjbrUQ63c5sgG1JbroHJJctwsEI75OOlekMuebEbjIJBLfgENGwPBMHv piv5TgCWr0VgYaXfp2eh2LINFywzqj823HiDPibQAXDrjzvF1ogksi/6cQZs8d4if8YQkLOr YISFouG+eR0nN1I7mUfIddXOWu6lJeTyqbWVurv58k2ekIXKaOC9ixLHFbcfYV0hOgRaTwQC B8CYF9nfqZla19iItfsN9QxN+ZdQjcRoYipp6HPCMfJlKH7GfaFcW93LKc4DKJ2lVL+pg/OQ lythZbjRPY492NG9kZ65aYstCs90uhMUEVVPuGUw7wBEku+6IEwZfrbMVKeWzLlPyM4Hv9hM 8ktxSmxWsPTPqpBC8eyeAQLalMELAyVcZlkaCtEcbj7w4l/JkYz+4l37obG8ZD+B34udBUUz MsAJ8foDFrBh2MOFA3hxD6G90D23mmWsri7pnKA2tZs92aQX7Ee+FbCyg6g5ln62Sq83ZDbf 53DdBs55EVpBadeInWmXhzCHPQx06H+CwTEjShTYIaMmBfrewvYUDKvFTC5iKQhAEUgt6i94 JsbG7NoeqcxkUMcBOEUQ3uCQG1D70ugspgXc0wd3Rimiq6535wARAQABzSFCcnlhbiBPJ0Rv bm9naHVlIDxib2RAa2VybmVsLm9yZz7CwZEEEwEIADsWIQTmk/sqq6Nt4Rerb7QicTuzoY3I OgUCZ+R+mwIbAwULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgAAKCRAicTuzoY3IOimUD/94 BwVEJX31JRe2sxbB/e1w2p8x1bxvTw5AeIzpV3ox7coJg1bSU2mnGuj1V4o0Yxf/3zmcJzCN VfVjwRF8Ii3GnC7uUXk2t+87piQfKTyJAYQABhZUKgoVJbjJq/S+C3XCKIyBA+EiezoUsgsA jTzwU+FzV7zVWIXFPJNtBERLwboE9w9U3KjAExOa1kSY8eLrsg6kOwlOHWy5UsQqYOjrS96M mzm2xuc1+RCjrndAyYhCnrOKvJ67HsPnBeJCjw7ImGD/U1GchwYbX8o3DO3JNHm3qfC86ZqX 2sCouENg4OzgPTtLKUrueM6xsu6KMM7gj17vxsiR3KQEoJnnMB8D1xtBofN3mFZE0wD9M24m 8yGunZbtntMCUHzIrlJgAPwKWKuGOYtA8UgMTFkccnUJtQrg9KotKtEF/FuftG9zLG9XEkt4 5ZdNgbSoLWgelu3T47mbOJ8LHhiLaCWP7yrovtVAvLUQ1BsiA42u8ECrFCFvQj9nrejE/ICv kP+uqcKtdDvP9HrIGycF1WZyfZLp0RvopKW92FLvI4I1QFWJ+wenk6+LGyJ5bzlrWzevjxmf nHcXE6sJBHrE7eijlbbImDAi3uLYN8Nd9Dm11IDAy4GAIQxSiQn0yblDhPiyGtchy80EVkCm g9k17Wol+2E2mC4DKgVdCkyUtTRSLgsJCs7BTQRkSTUoARAAuTnmWHBS6izRcEE93ajpzI7h dgQO4U3IRvOEsvIKR5NGcNEs0ngGebwsZ/lVULjN4vYU0LleqVhPBidNXUoZCN3A0F0Z2Ov8 NZdef+2EhQPBVWxFO7JBzhe8Z3ALj+wFtlg8akJjBzU56azW/iJzAobqHVrudzKoO2b1/CMg VbiAQ+RXjgfN5kY/HqYDU7mw+hXuUV9PbtX1L8xqQQac95oM9rHzKHHpiVwxTeJnGQsa+THi Kze+YET3rCoGHMvOQEJhdrucTv5FpAakKdkOFNel9FFckLRKEuWgCzhpFsjQ7xbirQgFUxG9 vlk1+q4hMRGNyEqoD6svYEeqbiUSd0oPUJeioiC3rNMRCNHLVrfZ2J6SCPkxfda08uzSdDQU 1/YPjOh8ZtQDMu7WctZ3XO288Z1gyBR49V7fbFs2w4sQxG+h/enlxqP7fdw1mjUlZjU5huCJ ielS0oEaIpmUpkugli7x4WhwLnhK2EbSoz7nLBC0y+ALUOdMlz/Y1l9xRt+bkDhpmf4O4IcI MxgZ0QMLq8rHDkGaEbsgZZHQPS58T0XE3IP30Q9SNxsruCMXtd2hYtBssf/wohc6JVsTtMg2 VYTPDPIFNZFSXupEJB7jlqpDWJ8ooJfJRLBatbjT5+mVQaMYB7Hs/t+zWYWaJKHyc8O6WLEC NUV5Tdt5EkkAEQEAAcLBdgQYAQoAIBYhBOaT+yqro23hF6tvtCJxO7Ohjcg6BQJkSTUoAhsM AAoJECJxO7Ohjcg6LuIQALnXt36OUuK43wqw6UYt0cnN6EbUqJHApAF5eNFn0jCCB2XELjSz JKJwuNAweowBdabiBniJ+501WIW+ewEsz1uby5fUQjZuCEsIkuaIluyfUFPb73qrQyAGuusd 7teA4WT+/jUku9g7lX5sVoRCrKQPkd16f6Bzfztyqyjcn43/X5yQI+wlboQ6HuKe/3I3yiOx OgmCHzOawpC9PvhEcKj79RLM3Zz5Ts5AuHpRX70Jz8Be76LwVFLp5Msx3S24ZTU1lBo2uiJ3 xSkay2lTpyVWRPx9vgcwzxGguOPJQJwsQeLb7wpoJMPpD3ERoaRii7Q7hvmxklpZjhKYWB3d t6nQ497Ek9loCrp3MIjRCSDN5xEGffiHks9yTeGMUQwO4tX8RE04uOJPkUY7uCFzFqN6/qey X3oFfPgkULMdiHofPAL1OskZSTzGPSfTYRE46NCJw8yoZBQ/oOyWeqaUQbK0wmW/g81wm8p7 LKSGEglMpiX07M1AotgvylN5C8fjbouoK+/RAMsXkk8jba6rPfuuXPaDjCyyKn6zSVHETnHW 3AJbgVY50T8STpnxayBQvWbCvu+6NOEjXCbyaOJig+5l0zlGN9XHjdANXC5HnwmyaGRL9YDq Jh2nVXVJDincOdQRdKcJjYLqaOAoWrYWSDi1iZGspHBTDrnOvfMQzzHY In-Reply-To: <20260709-vpu_iommu_iova_handling-v1-7-72bb62cb2dfd@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 09/07/2026 13:35, Vikash Garodia wrote: > The Iris VPU has separate streams with different IOVA constraints. The > non-pixel stream must be limited to the 0-600 MB IOVA range, while the > pixel stream can use the full IOVA space. > Using a single set of IOMMU entries for the Iris node does not describe > these per-stream limits and can allow accesses outside the supported > range, which may lead to device crashes. One such issue was reported at: > https://gitlab.freedesktop.org/drm/msm/-/work_items/100 > > Add non-pixel and pixel child nodes, move each stream ID to its > corresponding child node, and add a reserved IOVA range for the > non-pixel stream. > > Co-developed-by: Vishnu Reddy > Signed-off-by: Vishnu Reddy > Signed-off-by: Vikash Garodia The thing of it is, this _is_ a bugfix - perhaps its not one that can be backported, actually scratch that, this isn't possible to land in -stable realistically. So what is needed here is a strategy for fixing -stable. That could be apply Daniel's patch and backport it with Fixes: - with mainline then say applying this change and reverting Daniel's patch or That could mean some other solution for -stable - up for debate - what's not up for debate is this series needs to _address_ what happens to stable for all of the target platforms - and then transition mainline to the new and shiny way. That could mean - Applying Daniel's fix with Fixes: and cc-stable - That patch needs to be extended to _each_ Iris platform containing this bug... all of them I think. - Updating bindings - Updating DT with new method simultaneously reverting Daniel's fix And I do mean doing that in one progressive series - a fixup for mainline alone isn't enough. So we backport a fix from mainline and then make mainline better still. Or whatever something like that. Either way just fixing in mainline is not good enough for each of the targeted upstream DTS we need a solution for -stable too, keeping in mind new kernels need to work with old bindings. --- bod