linux-kernel - Re: [PATCH v8 00/14] Peripheral Image Loader support for Qualcomm SoCs running Linux host at EL2

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Message-ID: <20251124155336.6b45ddgwc5mh6q2y@hu-mojha-hyd.qualcomm.com>
Date: Mon, 24 Nov 2025 21:23:36 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        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
Subject: Re: [PATCH v8 00/14] Peripheral Image Loader support for Qualcomm
 SoCs running Linux host at EL2

On Mon, Nov 24, 2025 at 12:33:47PM +0100, Konrad Dybcio wrote:
> On 11/24/25 7:45 AM, Mukesh Ojha wrote:
> > On Fri, Nov 21, 2025 at 04:08:36PM +0100, Konrad Dybcio wrote:
> >> On 11/21/25 12:37 PM, Mukesh Ojha wrote:
> >>> On Fri, Nov 21, 2025 at 11:27:57AM +0000, Bryan O'Donoghue wrote:
> >>>> On 21/11/2025 11:01, Mukesh Ojha wrote:
> >>>>> In May 2025, we discussed the challenges at Linaro Connect 2025 [1]
> >>>>> related to Secure PAS remoteproc enablement when Linux is running at EL2
> >>>>> for Qualcomm SoCs.
> >>>>>
> >>>>> [1] https://resources.linaro.org/en/resource/sF8jXifdb9V1mUefdbfafa
> >>>>>

[...]

> >>>>>
> >>>>> Changes in v8: https://lore.kernel.org/lkml/20251113-kvm-rproc-v7-v7-0-df4910b7c20a@oss.qualcomm.com/
> >>>>>   - Addressed suggestion from Stephen which was regarding commit message(9/14),
> >>>>>     debug log(12/14) suggestion, and return type change(4/14).
> >>>>>   - Added R-b tag on 10/14 .
> >>>> Sorry.
> >>>>
> >>>> Did we actually come up with a cogent reason to omit the video firmware
> >>>> loading here ?
> >>>>
> >>>> AFAIU it is required for Lemans and Glymur - leaving it out is blocking
> >>>> getting video stuff done and storing up trouble.
> >>>>
> >>>> What exactly is the blockage - is it something you want help with ?
> >>>
> >>> I replied to you here[1] and given my reason..till something concluded on
> >>> "multi-cell IOMMU[2]", I can not add video and block what is working
> >>> already.
> >>>
> >>> [1]
> >>> https://lore.kernel.org/lkml/20251105081421.f6j7ks5bd4dfgr67@hu-mojha-hyd.qualcomm.com/
> >>>
> >>> [2]
> >>> https://lore.kernel.org/lkml/cover.1762235099.git.charan.kalla@oss.qualcomm.com/
> >>
> >> I see that the following files call qcom_scm_pas_auth_.*():
> >>
> >> drivers/firmware/qcom/qcom_scm.c
> >> drivers/gpu/drm/msm/adreno/adreno_gpu.c
> >> drivers/media/platform/qcom/iris/iris_firmware.c
> >> drivers/media/platform/qcom/venus/firmware.c
> >> drivers/net/ipa/ipa_main.c
> >> drivers/net/wireless/ath/ath12k/ahb.c
> >> drivers/remoteproc/qcom_q6v5_pas.c
> >> drivers/remoteproc/qcom_wcnss.c
> >>
> >> iris is difficult, rproc is done, adreno doesn't need it..
> >>
> >> would ath12k_ahb or IPA be affected by this series as well?
> > 
> > Yes, they would be affected, and the modem as well, when Linux is
> > running at EL2. However, I do not see them present in any of the QLi and
> > targeted compute SoCs at the moment. Therefore, our firmware does not
> > support it yet.
> 
> Hamoa's little brother should have ath12k_ahb.. and I assume IPA is
> present on at least some platforms where there's a modem (QCM6490?)

Sure, We will add the support for IP's when there is a need for SoC running Linux
at EL2 (backed by firmware).

> 
> Konrad

-- 
-Mukesh Ojha