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Fri, 10 Jul 2026 07:02:43 -0700 (PDT) X-Received: by 2002:a05:6a21:a95:b0:3bf:6c08:fb9d with SMTP id adf61e73a8af0-3c0bcead1b1mr14744716637.49.1783692162913; Fri, 10 Jul 2026 07:02:42 -0700 (PDT) Received: from [10.204.101.214] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13b659d8da9sm74944468c88.14.2026.07.10.07.02.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jul 2026 07:02:41 -0700 (PDT) Message-ID: <95a091d8-1b6b-4510-838f-2cd26ad54eff@oss.qualcomm.com> Date: Fri, 10 Jul 2026 19:32:35 +0530 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: [RFC PATCH 00/11] : media: iris: Migrate iommus to iris sub nodes To: Bryan O'Donoghue , 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: <7GAZnP6jPoRrcDnaVzeaB98cONLhtvbiEXV1yD5MJJrA9pCnC9lmlSiCGA8vlDezSXADjmFiqo3ZdClO5SxCFA==@protonmail.internalid> <20260709-vpu_iommu_iova_handling-v1-0-72bb62cb2dfd@oss.qualcomm.com> <1c652464-32b7-4411-8ed2-2885234513cc@kernel.org> Content-Language: en-US From: Vikash Garodia In-Reply-To: <1c652464-32b7-4411-8ed2-2885234513cc@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEwMDEzOSBTYWx0ZWRfX5uBWK7KM9gTi /zJ2sSZTmR9Gctovoy1euycJ9bwymVsrJCh0SooLghkUSnsm/FA1ITwQSaynrU/hjGrjwz5YbAV UsnfN40y8oQ+EDVWNMb13iZpGXe0qmg= X-Authority-Analysis: v=2.4 cv=DYgnbPtW c=1 sm=1 tr=0 ts=6a50fb84 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=BWZkUK8neK37NLIOuVAA:9 a=QEXdDO2ut3YA:10 a=zZCYzV9kfG8A:10 a=x9snwWr2DeNwDh03kgHS:22 X-Proofpoint-ORIG-GUID: KpNWySK33IvD2zDG4tptFYji1mhqNfD5 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEwMDEzOSBTYWx0ZWRfX38Nx+ttmGjhf vX3AOFxFJIBs/Cof+PNW3tmaLWTYI5OcClkwzLd+XCtAQvZToKR9xAhwQvZC1LNeYIqgHS5zFvf 2TUERq8B9AGG8T+apgG2U0lqP3Rt1da+2/QMfne7TYp5cJdD42RJQNHtdtGrYqMJQqhRQdFFLoI 0nfIQCZHCdOHZBrkCJrcqqVcmykrlhgOvkuzFBvwBd1J/+q4Eqt5iJQ9lA00q09SCDjDKkzObIL gQg6hcBoy2IFjL/W65k4v54nKH+UcqbRV9EGlS25aKlqiLHAY4Y/mYDIF4zze6ExDyIIPKn3F5m 4cjijZsvB1AwU4Ms4iE13XBo4d4aNtvc2Drbk4Hnuq41MNflTOkYEIHnZ8nD91nHNiMr3WG80r8 95OZ7JRsJjiPEyyrJC87BR1xpAZu5JCRO3fFjKzeLpIlZF6PsYnu33KviHZP3D7x5B16X563kNF J/hcscejgekH0Rw5Nog== X-Proofpoint-GUID: KpNWySK33IvD2zDG4tptFYji1mhqNfD5 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=2026-07-10_03,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=0 bulkscore=0 clxscore=1015 phishscore=0 malwarescore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607100139 On 7/10/2026 7:08 PM, Bryan O'Donoghue wrote: > On 10/07/2026 14:36, Vikash Garodia wrote: >>> What's the addressable range with sub-nodes ? >>> >>> The original problem you were trying to solve was the total addressable >>> size - this other problem here segmenting the linear allocation space is >>> adjacent but not the same thing. >>> >>> Without digging through all of the patches here - my question is does >>> the original sub-node addressable space problem get resolved in your >>> proposal here ? >> The proposal solves both the problem we have so far - total addressable >> size as well as which segment (or range) in that is_not_ addressable. > > So if I can distill this. > > You're proposing two objects in the DT one for each relevant IOMMU SID > and then the driver will register two different devices to get the full > range addresses ? yes, alongwith the _non_ addressable range specific to that object, to avoid the device crash. > > --- > bod