linux-kernel - Re: [PATCH] tools/power/x86/intel-speed-select: Display error on turbo mode disabled

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Date:   Wed, 11 May 2022 09:04:47 -0700
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/power/x86/intel-speed-select: Display error on
 turbo mode disabled

Hi Hans,

On Wed, 2022-05-11 at 17:56 +0200, Hans de Goede wrote:
> Hi,
> 
> On 5/10/22 04:34, Srinivas Pandruvada wrote:
> > For Intel SST turbo-freq feature to be enabled, the turbo mode on
> > the
> > platform must be enabled also. If turbo mode is disabled, display
> > error
> > while enabling turbo-freq feature.
> > 
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com>
> > ---
> > Since this is a trivial patch, I am not sending a PULL request.
> 
> Note not related to this patch, but when test building intel-speed-
> select
> I got the following compiler warning:
> 
>   CC      hfi-events.o
> In function ‘process_hfi_event’,
>     inlined from ‘handle_event’ at hfi-events.c:220:5:
> hfi-events.c:184:9: warning: ‘perf_cap.cpu’ may be used uninitialized
> [-Wmaybe-uninitialized]
>   184 |         process_level_change(perf_cap->cpu);
>       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> hfi-events.c: In function ‘handle_event’:
> hfi-events.c:193:25: note: ‘perf_cap.cpu’ was declared here
>   193 |         struct perf_cap perf_cap;
>       |                         ^~~~~~~~
> 
> 
Let me send a patch to fix. In reality this will not happen as HFI
message will always have a CPU.

Thanks,
Srinivas


> Regards,
> 
> Hans
> 
> 
> 
> > 
> >  tools/power/x86/intel-speed-select/isst-config.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/tools/power/x86/intel-speed-select/isst-config.c
> > b/tools/power/x86/intel-speed-select/isst-config.c
> > index 060390e88e37..9d35614995ee 100644
> > --- a/tools/power/x86/intel-speed-select/isst-config.c
> > +++ b/tools/power/x86/intel-speed-select/isst-config.c
> > @@ -1892,6 +1892,12 @@ static void set_fact_for_cpu(int cpu, void
> > *arg1, void *arg2, void *arg3,
> >         int ret;
> >         int status = *(int *)arg4;
> >  
> > +       if (status && no_turbo()) {
> > +               isst_display_error_info_message(1, "Turbo mode is
> > disabled", 0, 0);
> > +               ret = -1;
> > +               goto disp_results;
> > +       }
> > +
> >         ret = isst_get_ctdp_levels(cpu, &pkg_dev);
> >         if (ret) {
> >                 isst_display_error_info_message(1, "Failed to get
> > number of levels", 0, 0);
>