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Thu, 23 Jul 2026 02:06:51 -0700 (PDT) X-Received: by 2002:a05:622a:4d1:b0:51a:8079:795e with SMTP id d75a77b69052e-5283ddf815cmr16854531cf.4.1784797611461; Thu, 23 Jul 2026 02:06:51 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1c32f19c4csm203076466b.63.2026.07.23.02.06.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Jul 2026 02:06:50 -0700 (PDT) Message-ID: <67c78d88-92b8-44b9-bbcc-6f53f6c60ef9@oss.qualcomm.com> Date: Thu, 23 Jul 2026 11:06:47 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/4] dt-bindings: media: qcom,venus-common: Add IOMMU IOVA reservation region To: Bryan O'Donoghue , Vikash Garodia , Dikshita Agarwal , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jorge Ramirez-Ortiz , Stanimir Varbanov , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260722-shikra_vpu-v5-0-3d80babd4672@oss.qualcomm.com> <5nIoqMekE2B3CTU4TIlUJxoI3Exckc2sUM9RmZBqboEOvgmkdrhKlRX3-FiMOiYFCWXwzO5pii52NJ6epuy1Fw==@protonmail.internalid> <20260722-shikra_vpu-v5-1-3d80babd4672@oss.qualcomm.com> <557377b0-7a21-45b6-b62c-d3b34a6a29f4@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <557377b0-7a21-45b6-b62c-d3b34a6a29f4@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=HZgkiCE8 c=1 sm=1 tr=0 ts=6a61d9ac cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=KKAkSRfTAAAA:8 a=i4mD44tej1hBn5R5y4wA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-ORIG-GUID: mozPjIvFL6AIwBUPbK7k8dZea028-K9q X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIzMDA5MCBTYWx0ZWRfX7xKCOk1s62b/ rNniIEeY/uPd3FYRhSEHC0Ydad5ox0WVoECrkg5slde20a53aab/PzWZdvwCvZvxUqspaUni/qv SHJCBEcj1yVqkbWHzVcylcFhgCNZ9OyV7PF0s9mmfwvpH246166MtDmyV1eD5MMkZGSlHPxAew4 1DjeHF6R3a7IDsDip+6znNvg1Hl7T/8EaUscssWH86umz49gW6QSxDZHGlAY4ZHp8utYHzBvcdh Hg8FHLOecrKBxHr6WwWEiWqw1kTlBw94Qx1ZCPNzuZ1xRmfY3IX9NiglhPRcITwNoDpAALbDnBu Yych0QrhdSHT9pP4O6v8DJPJ2SSXPiMFsY9kIwwXeIZEEvbV8Bt0rhQuJIo2ujb3E4GB4zLsSB4 wNV3HpNGSuWa1s+AdNqNGb68Qic+QferCpG9jZUFAe111793QJhsW6jBG9b76o8essPlHZ6RerP ciwtEnDJ8jndr36ARpg== X-Proofpoint-GUID: mozPjIvFL6AIwBUPbK7k8dZea028-K9q X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIzMDA5MCBTYWx0ZWRfX2g1QLHBVggWD mLFuvkeSjpq4PZOJRVqV+OZxFtBwBAMwTiavDmOO5zfa1bcSmH/ioqFAHEJsbtkuUHbZDGRpA03 qhI+ZPFzOy5lSF1WaMtHTNO4IBG/6Hs= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-23_03,2026-07-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 phishscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607230090 On 7/23/26 12:03 AM, Bryan O'Donoghue wrote: > On 22/07/2026 14:41, Vikash Garodia wrote: >> Update the memory-region property to support two regions: >> 1. Firmware-loaded codec carveout (existing) >> 2. IOMMU IOVA reservation region (new) >> >> The IOMMU IOVA reservation region is required to restrict usage of >> specific IOVA memory range. For example, VPU restricts usage of 600MB >> for specific streams, which could otherwise lead to device crash. This >> change allows platforms to define separate memory regions for codec >> carveout and IOVA restrictions. >> This schema update supports existing DTS having single memory-region, >> thereby allowing gradual migration of DTS to support two memory region. >> >> Signed-off-by: Vikash Garodia >> --- > > I'm not mega-happy with this pattern being used - I prefer the pixel pixel_cb sub-node model you've proposed yourself. > > OTOH you're the maintainer so its really up to you how you want to arbitrate this - the 600MB constraint will work even if its not pretty or the best thing (tm). > > Reviewed-by: Bryan O'Donoghue Doesn't this cause the same limitation that the initial patch by Daniel (all HW contexts can't access 0-600MiB anymore)? Konrad