[{"id":3681470,"web_url":"http://patchwork.ozlabs.org/comment/3681470/","msgid":"<2026042305-pungent-urban-c681@gregkh>","list_archive_url":null,"date":"2026-04-23T13:38:25","subject":"Re: [PATCH v2 11/13] media: iris: Select DMA_CONTEXT_BUS to create\n firmware device","submitter":{"id":11800,"url":"http://patchwork.ozlabs.org/api/people/11800/","name":"Greg KH","email":"gregkh@linuxfoundation.org"},"content":"On Thu, Apr 23, 2026 at 06:59:40PM +0530, Vishnu Reddy wrote:\n> Iris need a firmware device to enable secure PAS (peripheral\n> authentication service) support in case of non-Gunyah.\n\nAs gunyah isn't ever going upstream, why is this an issue here for us at\nall?\n\nconfused,\n\ngreg k-h","headers":{"Return-Path":"\n <linux-tegra+bounces-13932-incoming=patchwork.ozlabs.org@vger.kernel.org>","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org\n header.a=rsa-sha256 header.s=korg header.b=siGgw8WK;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=linux-tegra+bounces-13932-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (1024-bit key) header.d=linuxfoundation.org\n header.i=@linuxfoundation.org header.b=\"siGgw8WK\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org [172.234.253.10])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g1cdP4yVdz1y2d\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 23 Apr 2026 23:39:21 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id 2E479300EF56\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 23 Apr 2026 13:38:28 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id E6C2A2BEFF6;\n\tThu, 23 Apr 2026 13:38:27 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F2E882899;\n\tThu, 23 Apr 2026 13:38:27 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id CDF50C2BCAF;\n\tThu, 23 Apr 2026 13:38:26 +0000 (UTC)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1776951507; cv=none;\n b=SC5kkedjKV6um9WPGpMUSMt8731y0iI2sftHvLMMxDsDMsZf6efbDap8k+bwtBPN5SnwUmtW1sNkg/nUUXHLo1KzZokBSJaV+NuS5USVymvQUc+wghJJBa4WtIl0vqGzvjGzluyVhn1XhITGKNw5XycSPbwj0qA7giGIjJxt3tM=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776951507; c=relaxed/simple;\n\tbh=3wo7czwl0nEqa1PIdDnQUQEnxYPP/Z67DAucX0mtg6A=;\n\th=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:\n\t Content-Type:Content-Disposition:In-Reply-To;\n b=Oj80YULso7Ap/oNMxpcknQiuL83IzAN+MiK35DzpzFGyMmH/Ea2b3kpjDSk2QVzXSiVEtLiO9fjdCe8AybZjAKONgyoVuLSqOhTIY/I6/mSF+eUpsMnyTzGazVj5j0q+FA0VgSQaJT0bmuP8jVyHC/TS9fGmjOTm11SpxTi+ZRI=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (1024-bit key) header.d=linuxfoundation.org\n header.i=@linuxfoundation.org header.b=siGgw8WK;\n arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org;\n\ts=korg; t=1776951507;\n\tbh=3wo7czwl0nEqa1PIdDnQUQEnxYPP/Z67DAucX0mtg6A=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=siGgw8WKeTOObuAD7awlSiObkHulMUGDGs5E5vA0f08Rh3YiBdU/wdoTbGEfYQmR3\n\t mJR2vBy47fIfYpsaFgS4aEETnl9GLyrG7R0uLDdr1gBR82CPAg99vYx83dZstyRsfY\n\t YOboDlN2s3BkfkUmHMCDGdxlBId2oxKOuetVDiy8=","Date":"Thu, 23 Apr 2026 15:38:25 +0200","From":"Greg Kroah-Hartman <gregkh@linuxfoundation.org>","To":"Vishnu Reddy <busanna.reddy@oss.qualcomm.com>","Cc":"Bryan O'Donoghue <bod@kernel.org>,\n\tVikash Garodia <vikash.garodia@oss.qualcomm.com>,\n\tDikshita Agarwal <dikshita.agarwal@oss.qualcomm.com>,\n\tAbhinav Kumar <abhinav.kumar@linux.dev>,\n\tMauro Carvalho Chehab <mchehab@kernel.org>,\n\tRob Herring <robh@kernel.org>,\n\tKrzysztof Kozlowski <krzk+dt@kernel.org>,\n\tConor Dooley <conor+dt@kernel.org>, Joerg Roedel <joro@8bytes.org>,\n\tWill Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>,\n\tBjorn Andersson <andersson@kernel.org>,\n\tKonrad Dybcio <konradybcio@kernel.org>,\n\tStefan Schmidt <stefan.schmidt@linaro.org>,\n\tHans Verkuil <hverkuil@kernel.org>,\n\t\"Rafael J. Wysocki\" <rafael@kernel.org>,\n\tDanilo Krummrich <dakr@kernel.org>,\n\tThierry Reding <thierry.reding@kernel.org>,\n\tMikko Perttunen <mperttunen@nvidia.com>,\n\tDavid Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,\n\tJonathan Hunter <jonathanh@nvidia.com>, linux-media@vger.kernel.org,\n\tlinux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, iommu@lists.linux.dev,\n\tdriver-core@lists.linux.dev, dri-devel@lists.freedesktop.org,\n\tlinux-tegra@vger.kernel.org","Subject":"Re: [PATCH v2 11/13] media: iris: Select DMA_CONTEXT_BUS to create\n firmware device","Message-ID":"<2026042305-pungent-urban-c681@gregkh>","References":"<20260423-glymur-v2-0-0296bccb9f4e@oss.qualcomm.com>\n <20260423-glymur-v2-11-0296bccb9f4e@oss.qualcomm.com>","Precedence":"bulk","X-Mailing-List":"linux-tegra@vger.kernel.org","List-Id":"<linux-tegra.vger.kernel.org>","List-Subscribe":"<mailto:linux-tegra+subscribe@vger.kernel.org>","List-Unsubscribe":"<mailto:linux-tegra+unsubscribe@vger.kernel.org>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260423-glymur-v2-11-0296bccb9f4e@oss.qualcomm.com>"}},{"id":3682399,"web_url":"http://patchwork.ozlabs.org/comment/3682399/","msgid":"<atmot2aw26hrystaxpnjtc6fmep2lsjdbarlfocysghl7db5gc@yrdyk6i6zd2p>","list_archive_url":null,"date":"2026-04-26T12:16:02","subject":"Re: [PATCH v2 11/13] media: iris: Select DMA_CONTEXT_BUS to create\n firmware device","submitter":{"id":90483,"url":"http://patchwork.ozlabs.org/api/people/90483/","name":"Dmitry Baryshkov","email":"dmitry.baryshkov@oss.qualcomm.com"},"content":"On Thu, Apr 23, 2026 at 03:38:25PM +0200, Greg Kroah-Hartman wrote:\n> On Thu, Apr 23, 2026 at 06:59:40PM +0530, Vishnu Reddy wrote:\n> > Iris need a firmware device to enable secure PAS (peripheral\n> > authentication service) support in case of non-Gunyah.\n> \n> As gunyah isn't ever going upstream, why is this an issue here for us at\n> all?\n\nVishnu, this is a nice example of why we are always asking for the\ncomplete commit message, describing the problem that you are solving.\nYou gave zero context for people outside of your group who don't have\na knowledge of your issue.\n\nPlease start thinking from the reviewers point of view. Or consider\nyourself being an engineer in 5 years wishing to change that code and\ntrying to understand, would you break something if you do this or that.\nYou need to explain, explain and explain things.\n\nFor example (please correct it, it is based on my incomplete\nunderstanding):\n\nIf Linux is run under the Gunyah control, the hypervisor will set up the\nSMMU SID for loading the firware (and protect it from being touched by\nte OS). If Linux is running in EL2 without Gunyah in play, it needs to\ntake care of that setup. Since loading the firmware requires separate\naddress mapping, corresponding SID is describing in DT as one of the\nfunctions inside the iommu-map property. Create the child device that\nwill be used for allocating DMA buffers for the firmware and mapping\nthem to the correct SID.\n\nPlease review all your commit messages from this position and adjust /\nrewrite them as necessary.","headers":{"Return-Path":"\n <linux-tegra+bounces-13972-incoming=patchwork.ozlabs.org@vger.kernel.org>","X-Original-To":["incoming@patchwork.ozlabs.org","linux-tegra@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=eBbizPPP;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=D3OT+idH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-tegra+bounces-13972-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com\n header.b=\"eBbizPPP\";\n\tdkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.b=\"D3OT+idH\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=205.220.180.131","smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=oss.qualcomm.com"],"Received":["from tor.lore.kernel.org (tor.lore.kernel.org [172.105.105.114])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g3Qf52VqBz1y2d\n\tfor <incoming@patchwork.ozlabs.org>; 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Wysocki\" <rafael@kernel.org>,\n        Danilo Krummrich <dakr@kernel.org>,\n        Thierry Reding <thierry.reding@kernel.org>,\n        Mikko Perttunen <mperttunen@nvidia.com>,\n        David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,\n        Jonathan Hunter <jonathanh@nvidia.com>, linux-media@vger.kernel.org,\n        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,\n        linux-kernel@vger.kernel.org, iommu@lists.linux.dev,\n        driver-core@lists.linux.dev, dri-devel@lists.freedesktop.org,\n        linux-tegra@vger.kernel.org","Subject":"Re: [PATCH v2 11/13] media: iris: Select DMA_CONTEXT_BUS to create\n firmware device","Message-ID":"<atmot2aw26hrystaxpnjtc6fmep2lsjdbarlfocysghl7db5gc@yrdyk6i6zd2p>","References":"<20260423-glymur-v2-0-0296bccb9f4e@oss.qualcomm.com>\n <20260423-glymur-v2-11-0296bccb9f4e@oss.qualcomm.com>\n <2026042305-pungent-urban-c681@gregkh>","Precedence":"bulk","X-Mailing-List":"linux-tegra@vger.kernel.org","List-Id":"<linux-tegra.vger.kernel.org>","List-Subscribe":"<mailto:linux-tegra+subscribe@vger.kernel.org>","List-Unsubscribe":"<mailto:linux-tegra+unsubscribe@vger.kernel.org>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<2026042305-pungent-urban-c681@gregkh>","X-Authority-Analysis":"v=2.4 cv=K8QS2SWI c=1 sm=1 tr=0 ts=69ee0206 cx=c_pps\n a=JbAStetqSzwMeJznSMzCyw==:117 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10\n a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=FZe96GFAMPEOsOiVEGMA:9\n a=CjuIK1q_8ugA:10 a=uxP6HrT_eTzRwkO_Te1X:22","X-Proofpoint-ORIG-GUID":"GIDvRgxp0mMHT5ilOXzrqBTpmM2UEx2D","X-Proofpoint-GUID":"GIDvRgxp0mMHT5ilOXzrqBTpmM2UEx2D","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDI2MDEzMyBTYWx0ZWRfX9RpP6IBwUGbg\n HlWIJpiOmZ7kEAei4cMVYg05yhKf+S2O/YkTOkfY4xV4IUYXfF+4V8EL6eyoBsSkgLOuy7UVUP1\n Ut8uAMpf86VDpRnuaq/WGb6skXcH0sW9BPzPNK+DT/CTMVR/RTAudfzPo7Dg9T9oxojKe433vkL\n BBOb+wQErRXrWAKSj68bvw3cLsK0atQ41QoA2AYZltIK/lteLIU8kYK+xpMu9QMw2zV89eEassG\n 0LKot3YvlZStOr4YbLHR4HKGlR12q1BjEPcihQfwfHiqe4cXemU7deZjsbsuarn9FiuQi9uFGKg\n 6R+lN7AvU/lpFCbQKW1EvPSP1PSpdINJ/BQ/ZAxqjm/YskoCYhVdyGxpMV+bLsv/ZeUKUe0Qu4E\n HwzwwzcdZHxUU8PYuwYBxDRboEWXTIKN/ussDkPpRlaeN9ap8Sn3GT+y2nodExFVyZEBQL5ToQS\n 9dCp/loBPHfW664xEQQ==","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-26_04,2026-04-21_02,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n clxscore=1015 impostorscore=0 spamscore=0 malwarescore=0 phishscore=0\n priorityscore=1501 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604260133"}}]