linux-kernel - Re: [PATCH v2 2/3] soc: qcom: socinfo: Add support for new fields in revision 21

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Message-ID: <aBzPn2OXapJLsikk@hu-mojha-hyd.qualcomm.com>
Date: Thu, 8 May 2025 21:07:03 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] soc: qcom: socinfo: Add support for new fields in
 revision 21

On Fri, Apr 25, 2025 at 08:28:51PM +0300, Dmitry Baryshkov wrote:
> On Fri, Apr 25, 2025 at 07:29:45PM +0530, Mukesh Ojha wrote:
> > Add the subpartfeature offset field to the socinfo structure
> > which came for version 21 of socinfo structure.
> > 
> > Subpart_feat_offset is subpart like camera, display, etc.,
> > and its internal feature available on a bin.
> > 
> > Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> > ---
> > Changes in v2:
> >  - Added debugfs entry and described more about the field in commit.
> > 
> >  drivers/soc/qcom/socinfo.c       | 6 ++++++
> >  include/linux/soc/qcom/socinfo.h | 2 ++
> >  2 files changed, 8 insertions(+)
> > 
> > diff --git a/drivers/soc/qcom/socinfo.c b/drivers/soc/qcom/socinfo.c
> > index 5800ebf9ceea..bac1485f1b27 100644
> > --- a/drivers/soc/qcom/socinfo.c
> > +++ b/drivers/soc/qcom/socinfo.c
> > @@ -154,6 +154,7 @@ struct socinfo_params {
> >  	u32 boot_cluster;
> >  	u32 boot_core;
> >  	u32 raw_package_type;
> > +	u32 nsubpart_feat_array_offset;
> >  };
> >  
> >  struct smem_image_version {
> > @@ -608,6 +609,11 @@ static void socinfo_debugfs_init(struct qcom_socinfo *qcom_socinfo,
> >  			   &qcom_socinfo->info.fmt);
> >  
> >  	switch (qcom_socinfo->info.fmt) {
> > +	case SOCINFO_VERSION(0, 21):
> > +		qcom_socinfo->info.nsubpart_feat_array_offset =
> > +				   __le32_to_cpu(info->nsubpart_feat_array_offset);
> > +		debugfs_create_u32("nsubpart_feat_array_offset", 0444, qcom_socinfo->dbg_root,
> > +				   &qcom_socinfo->info.nsubpart_feat_array_offset);
> 
> An offset into what? If this provides additional data, then the data
> should be visible in the debugfs. Not sure, what's the point in dumping
> the offset here.

offset into info(struct socinfo) object.

I agree to you and I said the same in first version this is just offset
and does not provide any debug info we would look from userspace.  For
parity with other fields I did it for all newly added fields.
I have dropped it in latest patch.

-Mukesh