linux-kernel - Re: [PATCH v6 05/14] remoteproc: pas: Replace metadata context with PAS context structure

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Message-ID: <20251105064252.qxqkno4xqwfrhmlf@hu-mojha-hyd.qualcomm.com>
Date: Wed, 5 Nov 2025 12:12:52 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
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
Subject: Re: [PATCH v6 05/14] remoteproc: pas: Replace metadata context with
 PAS context structure

On Tue, Nov 04, 2025 at 06:33:49PM +0100, Konrad Dybcio wrote:
> On 11/4/25 8:35 AM, Mukesh Ojha wrote:
> > As a superset of the existing metadata context, the PAS context
> > structure enables both remoteproc and non-remoteproc subsystems to
> > better support scenarios where the SoC runs with or without the Gunyah
> > hypervisor. To reflect this, relevant SCM and metadata functions are
> > updated to incorporate PAS context awareness.
> > 
> > Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> > ---
> >  drivers/firmware/qcom/qcom_scm.c       | 25 +++++++++++++---------
> >  drivers/remoteproc/qcom_q6v5_pas.c     | 38 ++++++++++++++++++++++++----------
> >  drivers/soc/qcom/mdt_loader.c          |  4 ++--
> >  include/linux/firmware/qcom/qcom_scm.h |  4 ++--
> >  include/linux/soc/qcom/mdt_loader.h    |  6 +++---
> >  5 files changed, 49 insertions(+), 28 deletions(-)
> > 
> > diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> > index 5a525dbd0a2e..9cdd152da592 100644
> > --- a/drivers/firmware/qcom/qcom_scm.c
> > +++ b/drivers/firmware/qcom/qcom_scm.c
> > @@ -603,7 +603,7 @@ EXPORT_SYMBOL_GPL(devm_qcom_scm_pas_context_init);
> >   *		and optional blob of data used for authenticating the metadata
> >   *		and the rest of the firmware
> >   * @size:	size of the metadata
> > - * @ctx:	optional metadata context
> > + * @ctx:	optional pas context
> >   *
> >   * Return: 0 on success.
> >   *
> > @@ -612,8 +612,9 @@ EXPORT_SYMBOL_GPL(devm_qcom_scm_pas_context_init);
> >   * qcom_scm_pas_metadata_release() by the caller.
> >   */
> >  int qcom_scm_pas_init_image(u32 pas_id, const void *metadata, size_t size,
> > -			    struct qcom_scm_pas_metadata *ctx)
> > +			    struct qcom_scm_pas_context *ctx)
> >  {
> > +	struct qcom_scm_pas_metadata *mdt_ctx;
> 
> This is never initialized
> 
> >  	dma_addr_t mdata_phys;
> >  	void *mdata_buf;
> >  	int ret;
> > @@ -665,9 +666,10 @@ int qcom_scm_pas_init_image(u32 pas_id, const void *metadata, size_t size,
> >  	if (ret < 0 || !ctx) {
> >  		dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
> >  	} else if (ctx) {
> > -		ctx->ptr = mdata_buf;
> > -		ctx->phys = mdata_phys;
> > -		ctx->size = size;
> > +		mdt_ctx = ctx->metadata;
> > +		mdt_ctx->ptr = mdata_buf;
> > +		mdt_ctx->phys = mdata_phys;
> > +		mdt_ctx->size = size;
> 
> So this will always cause stack corruption
> 
> >  	}
> >  
> >  	return ret ? : res.result[0];
> > @@ -676,16 +678,19 @@ EXPORT_SYMBOL_GPL(qcom_scm_pas_init_image);
> >  
> >  /**
> >   * qcom_scm_pas_metadata_release() - release metadata context
> > - * @ctx:	metadata context
> > + * @ctx:	pas context
> >   */
> > -void qcom_scm_pas_metadata_release(struct qcom_scm_pas_metadata *ctx)
> > +void qcom_scm_pas_metadata_release(struct qcom_scm_pas_context *ctx)
> >  {
> > -	if (!ctx->ptr)
> > +	struct qcom_scm_pas_metadata *mdt_ctx;
> 
> Is the existence of this struct any useful after you introduced
> pas_context?

Yes, it is still useful, mdt_ctx is only relevant for remoteproc based
subsystem like adsp, cdsp, modem while they are not required for video,
ipa, gpu etc. but the superset which is pas_context is needed by
whosoever need to support secure PAS method Linux at EL2.

> 
> Konrad

-- 
-Mukesh Ojha