linux-kernel - Re: [PATCH] ACPI: CPPC: add sysfs entry for guaranteed performance

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Message-ID: <20240621104848.3f14d60e@mordecai.tesarici.cz>
Date: Fri, 21 Jun 2024 10:48:48 +0200
From: Petr Tesarik <petr.tesarik@...e.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: CPPC: add sysfs entry for guaranteed performance

On Thu,  6 Jun 2024 13:55:41 +0200
Petr Tesarik <ptesarik@...e.com> wrote:

> Expose the CPPC guaranteed performance as reported by the platform through
> GuaranteedPerformanceRegister.
> 
> The current value is already read in cppc_get_perf_caps() and stored in
> struct cppc_perf_caps (to be used by the intel_pstate driver), so only the
> attribute itself needs to be defined.

Are there any objections to exposing this CPPC register through sysfs?
I mean, if everybody is OK with it, the patch could be acked and queued
for 6.11, right?

Petr T

> Signed-off-by: Petr Tesařík <ptesarik@...e.com>
> ---
>  drivers/acpi/cppc_acpi.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
> index 1d857978f5f4..9976bb57356e 100644
> --- a/drivers/acpi/cppc_acpi.c
> +++ b/drivers/acpi/cppc_acpi.c
> @@ -160,6 +160,7 @@ show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, highest_perf);
>  show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_perf);
>  show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_perf);
>  show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_nonlinear_perf);
> +show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, guaranteed_perf);
>  show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_freq);
>  show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_freq);
>  
> @@ -196,6 +197,7 @@ static struct attribute *cppc_attrs[] = {
>  	&highest_perf.attr,
>  	&lowest_perf.attr,
>  	&lowest_nonlinear_perf.attr,
> +	&guaranteed_perf.attr,
>  	&nominal_perf.attr,
>  	&nominal_freq.attr,
>  	&lowest_freq.attr,