linux-kernel - Re: [PATCH v7 09/14] firmware: qcom_scm: Simplify qcom_scm_pas_init

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Message-ID: <20251113142752.syzvlfxe45a7kxrj@hu-mojha-hyd.qualcomm.com>
Date: Thu, 13 Nov 2025 19:57:52 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Stephan Gerhold <stephan.gerhold@...aro.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>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v7 09/14] firmware: qcom_scm: Simplify
 qcom_scm_pas_init_image()

On Thu, Nov 13, 2025 at 01:12:20PM +0100, Stephan Gerhold wrote:
> On Thu, Nov 13, 2025 at 04:05:59PM +0530, Mukesh Ojha wrote:
> > Simplify qcom_scm_pas_init_image() by making the memory allocation,
> > copy and free operations done in a separate function than the actual
> > SMC call.
> 
> Nitpick: This feels more like "refactoring in preparation of the
> following patch" rather than a real simplification.

Will reword it.

> 
> > 
> > Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> > Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> > Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> > ---
> >  drivers/firmware/qcom/qcom_scm.c | 58 +++++++++++++++++++++++-----------------
> >  1 file changed, 33 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> > index 550707f2b46d..1d8a2c537c44 100644
> > --- a/drivers/firmware/qcom/qcom_scm.c
> > +++ b/drivers/firmware/qcom/qcom_scm.c
> > @@ -590,6 +590,37 @@ void *devm_qcom_scm_pas_context_init(struct device *dev, u32 pas_id, phys_addr_t
> >  }
> >  EXPORT_SYMBOL_GPL(devm_qcom_scm_pas_context_init);
> >  
> > +static int __qcom_scm_pas_init_image(u32 pas_id, dma_addr_t mdata_phys, void *metadata,
> > +				     size_t size, struct qcom_scm_res *res)
> 
> The metadata and size parameters do not seem to be used inside this
> function (also not after your follow-up patches), do we need them here?

Yeah, you are right, no we don't need them. 

> 
> > +{
> > +	struct qcom_scm_desc desc = {
> > +		.svc = QCOM_SCM_SVC_PIL,
> > +		.cmd = QCOM_SCM_PIL_PAS_INIT_IMAGE,
> > +		.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW),
> > +		.args[0] = pas_id,
> > +		.owner = ARM_SMCCC_OWNER_SIP,
> > +	};
> > +	int ret;
> > +
> > +	ret = qcom_scm_clk_enable();
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = qcom_scm_bw_enable();
> > +	if (ret)
> > +		goto disable_clk;
> > +
> > +	desc.args[1] = mdata_phys;
> > +
> > +	ret = qcom_scm_call(__scm->dev, &desc, res);
> > +	qcom_scm_bw_disable();
> > +
> > +disable_clk:
> > +	qcom_scm_clk_disable();
> > +
> > +	return ret;
> > +}
> 
> Thanks,
> Stephan

-- 
-Mukesh Ojha