linux-kernel - Re: [UPDATE][PATCH] platform/x86/intel-uncore-freq: Conditionally create attribute for read frequency

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Date:   Thu, 05 Oct 2023 07:07:58 -0700
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org,
        ilpo.jarvinen@...ux.intel.com, andriy.shevchenko@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [UPDATE][PATCH] platform/x86/intel-uncore-freq: Conditionally
 create attribute for read frequency

Hi Hans,


On Thu, 2023-10-05 at 09:03 +0200, Hans de Goede wrote:
> Hi Srinivas,
> 
> On 10/4/23 20:19, Srinivas Pandruvada wrote:
> > When the current uncore frequency can't be read, don't create
> > attribute
> > "current_freq_khz" as any read will fail later. Some user space
> > applications like turbostat fail to continue with the failure. So,
> > check
> > error during attribute creation.
> > 
> > Fixes: 414eef27283a ("platform/x86/intel/uncore-freq: Display
> > uncore current frequency")
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com>
> > ---
> > Added fixes tag which added current_freq_khz. But after this
> > tag there is reorg of code, so need manual backport for some
> > versions.
> > I will separately submit to stable trees after merge.
> 
> Can you for future updated patches please use the ususal [PATCH v2],
> [PATCH v3], etc. prefix ?
> 
Sorry about this. I usually do with code change. But will keep in mind.

Thanks,
Srinivas


> Also please document the changes per version after the cutline, e.g.
> :
> 
> ```
> ---
> Changes in v2:
> - Added fixes tag which added current_freq_khz. Note after this
>   tag there is reorg of code, so need manual backport for some
> versions.
>   I will separately submit to stable trees after merge.
> ```
> 
> Regards,
> 
> Hans
> 
> 
> 
> 
> > 
> >  .../x86/intel/uncore-frequency/uncore-frequency-common.c  | 8
> > ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-
> > frequency-common.c b/drivers/platform/x86/intel/uncore-
> > frequency/uncore-frequency-common.c
> > index 1152deaa0078..33ab207493e3 100644
> > --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-
> > common.c
> > +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-
> > common.c
> > @@ -176,7 +176,7 @@ show_uncore_data(initial_max_freq_khz);
> >  
> >  static int create_attr_group(struct uncore_data *data, char *name)
> >  {
> > -       int ret, index = 0;
> > +       int ret, freq, index = 0;
> >  
> >         init_attribute_rw(max_freq_khz);
> >         init_attribute_rw(min_freq_khz);
> > @@ -197,7 +197,11 @@ static int create_attr_group(struct
> > uncore_data *data, char *name)
> >         data->uncore_attrs[index++] = &data-
> > >min_freq_khz_dev_attr.attr;
> >         data->uncore_attrs[index++] = &data-
> > >initial_min_freq_khz_dev_attr.attr;
> >         data->uncore_attrs[index++] = &data-
> > >initial_max_freq_khz_dev_attr.attr;
> > -       data->uncore_attrs[index++] = &data-
> > >current_freq_khz_dev_attr.attr;
> > +
> > +       ret = uncore_read_freq(data, &freq);
> > +       if (!ret)
> > +               data->uncore_attrs[index++] = &data-
> > >current_freq_khz_dev_attr.attr;
> > +
> >         data->uncore_attrs[index] = NULL;
> >  
> >         data->uncore_attr_group.name = name;
>