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 17:56:08 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.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,

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;
      |                         ^~~~~~~~


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);