linux-kernel - Re: [PATCH v6 01/14] dt-bindings: remoteproc: qcom,pas: Add iommus property

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Message-ID: <20251105083402.dvm2w7ezp7spgtz6@hu-mojha-hyd.qualcomm.com>
Date: Wed, 5 Nov 2025 14:04:02 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v6 01/14] dt-bindings: remoteproc: qcom,pas: Add iommus
 property

On Wed, Nov 05, 2025 at 08:17:14AM +0100, Krzysztof Kozlowski wrote:
> On 04/11/2025 08:35, Mukesh Ojha wrote:
> > Most Qualcomm platforms feature Gunyah hypervisor which handles IOMMU
> 
> I don't think that's true. Washn't Gunyah something new? Like since
> SM8550? Look how many Qualcomm platforms we have in the arm/qcom.yaml
> bindings - for sure most of them are not post SM8550.


I should have rephrased it, thanks 

"Qualcomm platform which feature QHEE based hypervisor or a module in Gunyah
 ... "

> 
> > configuration for remote processor and when it is not present, the
> > operating system must perform these configurations instead and for that
> > firmware stream should be presented to the operating system. Hence, add
> > iommus property as optional property for PAS supported devices.
> 
> So which platforms actually need to do this?

As I said above, almost every platform which features QHEE or Gunyah
hypervisor that support PAS based remoteproc subsystem should have this.

> 
> I really do not understand why you are adding this to SDX55 and several
> others.

Firmware IOMMU context bank was always managed by QHEE hypervisor or
Gunyah it is more of never mentioned schema in PAS schema. So, even
SDX55 should have these as optional.

> 
> 
> 
> Best regards,
> Krzysztof

-- 
-Mukesh Ojha