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 5314347CA9E; Fri, 7 Aug 2026 13:18:53 +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=1786108736; cv=none; b=L/qEsbY/5/RG0xm56lIIZDaDA88ztYJUmjrqZ01vz26Vw5D4xoyot3ADNtzPkMPRq3TOArTg8BThTRjZP5r14uunkPOynfvj/7xYwPbAejSHtxq2STLI87CksYHt58nkQutOBAD9Gx/6w7n6ZrEKztVfhICvDdxchOlF3O/3nlQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786108736; c=relaxed/simple; bh=ytXj4LIHV6pRii9XHrgkxRSxX023oR+CfrXTR3cIebc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fN05F2uSbIuHnqPUfeoB/tIeDRhCE/KdwpPc1VtNMrviVFuKCvEZ8AvMQ3l2XwIxefBTs/Z/AHNYxeurQyNp7d/UPuxkL0/FJwTYzixE2VvN+n2D8RFs+48Bd4DL+gDc0HCOLZ+psJi1CGD/oK2Lk4MMi2FGbXsQqt7hjXrewuM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QUk1xyd+; 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="QUk1xyd+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2D6B1F00A3A; Fri, 7 Aug 2026 13:18:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786108732; bh=02YeJPm7xlJQwKE9qDUlS2slovYLgvSkhe/gheSSvQo=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=QUk1xyd+pepVc5h0MI3JJTgg0+ZblSntI4W1TN57Op89kq/IVbQQ8MnhjLCjwzj9x r76vxUK3RMXvZcmwWTmNmU3eaAHDhymTrf7svsBlbfr9/PJI/INhXuMjXWX3KKIRTB Ya2QcY4JDpF1BX5oI73zuMxG3xMQGtZy3NHgmiBkll4KsnUd4VzjcbLaYX8zcRUOxL kVXKl+9cWE4PWvGsw6BU7r5FoFhKdOVXbpaUIN7FM/tIuPqmC84kJ2361wXurEY0ew QRV2AVC/fcpJ0Hgr4vTenj9pKOZGFQptPmvOrO6g+VIdqeE+MyX3zf0gjclXIW09TU Q/NmBxz7UJXWA== Message-ID: <181b02e3-831e-4461-9327-ab5646380a10@kernel.org> Date: Fri, 7 Aug 2026 14:18:42 +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: [PATCH 04/22] arm64: dts: qcom: hamoa: Reserve low IOVA range for Iris To: Vikash Garodia , Dmitry Baryshkov Cc: Dikshita Agarwal , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Stanimir Varbanov , Sakari Ailus , Abhinav Kumar , Stephan Gerhold , Bjorn Andersson , Stanimir Varbanov , Konrad Dybcio , Johan Hovold , Neil Armstrong , Loic Poulain , Jorge Ramirez-Ortiz , Mansur Alisha Shaik , Andy Gross , Rob Clark , Stephen Boyd , Yassine Oudjana , Pierre-Hugues Husson , Marc Gonzalez , cros-qcom-dts-watchers@chromium.org, Matthias Kaehlcke , Douglas Anderson , AngeloGioacchino Del Regno , Aniket Masule , Malathi Gottam , Rajendra Nayak , Jonathan Marek , Dikshita Agarwal , Renjiang Han , Krzysztof Kozlowski , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Bryan O'Donoghue , Mauro Carvalho Chehab , Konrad Dybcio , Krzysztof Kozlowski , Daniel J Blueman , stable@vger.kernel.org References: <20260807-iris_iova_600mb_fix-v1-0-3996f67e33f9@oss.qualcomm.com> <20260807-iris_iova_600mb_fix-v1-4-3996f67e33f9@oss.qualcomm.com> <27f0b033-e940-4369-aaa0-f08426aac73f@oss.qualcomm.com> <429d5d1d-92d5-4949-9991-b092cc7e9937@oss.qualcomm.com> From: Bryan O'Donoghue Content-Language: en-GB Autocrypt: addr=bod@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07/08/2026 11:22, Vikash Garodia wrote: >>>> I don't like the idea of this series, because it_again_ doesn't tell us >>>> the truth about the hardware. This typicall ends up with bigger problems >>> honestly...thats all the info i have about the vpu hardware that it >>> restricts non pixel to DMA from the 0-600MB range. The same i have been >>> trying for a year now >> You are not honest here. You also know that there are secure streams, >> which have to use their own IOMMU SIDs. And some of them, as far as I >> remember, also have memory range restrictions. > please read the commit description again, the answer is there. So I don't necessarily get all of the detail out of the commit log myself. Could you give some detail to address Dmitry's point. The question as I read it is - are all of the other potential SIDs covered by this change ? >> So, if we land these patches, how do extend it later to account for all >> of that? >> > forward looking design would be subnode, which we can land ontop of this > series. Yes it should be possible to branch to make subnodes work on-top of this - accepting that once this lands it becomes ABI and support for this method must be sustained, even after sub-nodes land. --- bod