linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: agatti: Fix IOMMU DT properties

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Message-ID: <e2f0b92b-d880-4de7-a708-c0de00ec69bd@oss.qualcomm.com>
Date: Mon, 29 Dec 2025 13:41:50 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Sumit Garg <sumit.garg@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, akhilpo@....qualcomm.com,
        vikash.garodia@....qualcomm.com, dikshita.agarwal@....qualcomm.com,
        robin.clark@....qualcomm.com, lumag@...nel.org,
        linux-kernel@...r.kernel.org, Sumit Garg <sumit.garg@....qualcomm.com>,
        Prakash Gupta <guptap@....qualcomm.com>
Subject: Re: [PATCH 1/2] arm64: dts: qcom: agatti: Fix IOMMU DT properties

On 12/29/25 8:12 AM, Sumit Garg wrote:
> From: Sumit Garg <sumit.garg@....qualcomm.com>
> 
> Fix IOMMU DT propeties for GPU, display and video peripherals via
> dropping SMMU stream IDs which relates to secure context bank.
> 
> This problem only surfaced when the Gunyah based firmware stack is
> ported on Agatti replacing the legacy QHEE based firmware stack. Assigning
> Linux kernel (HLOS) VMID to secure context bank stream IDs is treated
> as a fault by Gunyah hypervisor which were previously ignored by QHEE
> hypervisor.
> 
> The DT changes should be backwards compatible with legacy QHEE based
> firmware stack too.
> 
> Suggested-by: Prakash Gupta <guptap@....qualcomm.com>
> Signed-off-by: Sumit Garg <sumit.garg@....qualcomm.com>
> ---

This will need to be resolved by something like iommu-map anyway

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad