linux-kernel - Re: [PATCH v6 6/7] arm64: dts: qcom: qcm2290: Add Venus video node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6985874e-efae-746d-efbd-dc537b5f24c0@quicinc.com>
Date: Thu, 10 Jul 2025 15:56:57 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Jorge Ramirez-Ortiz
	<jorge.ramirez@....qualcomm.com>,
        <quic_vgarodia@...cinc.com>, <krzk+dt@...nel.org>,
        <konradybcio@...nel.org>, <mchehab@...nel.org>, <robh@...nel.org>,
        <conor+dt@...nel.org>, <andersson@...nel.org>,
        <amit.kucheria@....qualcomm.com>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 6/7] arm64: dts: qcom: qcm2290: Add Venus video node



On 7/10/2025 2:45 PM, Bryan O'Donoghue wrote:
> On 10/07/2025 09:57, Dikshita Agarwal wrote:
>>> +            iommus = <&apps_smmu 0x860 0x0>,
>>> +                 <&apps_smmu 0x880 0x0>,
>>> +                 <&apps_smmu 0x861 0x04>,
>>> +                 <&apps_smmu 0x863 0x0>,
>>> +                 <&apps_smmu 0x804 0xe0>;
>> What’s the rationale behind having five entries here?
>> could you share the use-cases that justify this configuration?
> 
> Already getting in trouble with non-pixel/secure # of iommus.
> 
> Why not specify the maximum expected number hardware supports, specifically
> so we don't end up buried under incomplete schema again ?

Adding this in DT schema is fine, concern here is, adding it to the DT
without a present use-case may be premature. Surprising to see it doesn't
create any boot-up issues.

Thanks,
Dikshita
> 
> ---
> bod