linux-kernel - RE: [PATCH V11 2/7] acpi: cppc: Add get the highest performance cppc control

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Date:   Thu, 30 Nov 2023 06:02:02 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     "Meng, Li (Jassmine)" <Li.Meng@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "Huang, Ray" <Ray.Huang@....com>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Huang, Shimmer" <Shimmer.Huang@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        "Karny, Wyes" <Wyes.Karny@....com>
Subject: RE: [PATCH V11 2/7] acpi: cppc: Add get the highest performance cppc
 control

[AMD Official Use Only - General]

> -----Original Message-----
> From: Meng, Li (Jassmine) <Li.Meng@....com>
> Sent: Wednesday, November 29, 2023 2:55 PM
> To: Rafael J . Wysocki <rafael.j.wysocki@...el.com>; Huang, Ray
> <Ray.Huang@....com>
> Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; x86@...nel.org;
> linux-acpi@...r.kernel.org; Shuah Khan <skhan@...uxfoundation.org>; linux-
> kselftest@...r.kernel.org; Fontenot, Nathan <Nathan.Fontenot@....com>;
> Sharma, Deepak <Deepak.Sharma@....com>; Deucher, Alexander
> <Alexander.Deucher@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>; Huang, Shimmer <Shimmer.Huang@....com>;
> Yuan, Perry <Perry.Yuan@....com>; Du, Xiaojian <Xiaojian.Du@....com>;
> Viresh Kumar <viresh.kumar@...aro.org>; Borislav Petkov <bp@...en8.de>;
> Oleksandr Natalenko <oleksandr@...alenko.name>; Meng, Li (Jassmine)
> <Li.Meng@....com>; Karny, Wyes <Wyes.Karny@....com>
> Subject: [PATCH V11 2/7] acpi: cppc: Add get the highest performance cppc
> control
>
> Add support for getting the highest performance to the generic CPPC driver. This
> enables downstream drivers such as amd-pstate to discover and use these
> values.
>
> Please refer to the ACPI_Spec for details on continuous performance control of
> CPPC.
>
> Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
> Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> Reviewed-by: Wyes Karny <wyes.karny@....com>
> Acked-by: Huang Rui <ray.huang@....com>
> Signed-off-by: Meng Li <li.meng@....com>
> Link:
> https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?
> highlight=cppc#highest-performance
> ---
>  drivers/acpi/cppc_acpi.c | 13 +++++++++++++  include/acpi/cppc_acpi.h |  5
> +++++
>  2 files changed, 18 insertions(+)
>
> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index
> 7ff269a78c20..ad388a0e8484 100644
> --- a/drivers/acpi/cppc_acpi.c
> +++ b/drivers/acpi/cppc_acpi.c
> @@ -1154,6 +1154,19 @@ int cppc_get_nominal_perf(int cpunum, u64
> *nominal_perf)
>       return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf);  }
>
> +/**
> + * cppc_get_highest_perf - Get the highest performance register value.
> + * @cpunum: CPU from which to get highest performance.
> + * @highest_perf: Return address.
> + *
> + * Return: 0 for success, -EIO otherwise.
> + */
> +int cppc_get_highest_perf(int cpunum, u64 *highest_perf) {
> +     return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf); }
> +EXPORT_SYMBOL_GPL(cppc_get_highest_perf);
> +
>  /**
>   * cppc_get_epp_perf - Get the epp register value.
>   * @cpunum: CPU from which to get epp preference value.
> diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h index
> 6126c977ece0..c0b69ffe7bdb 100644
> --- a/include/acpi/cppc_acpi.h
> +++ b/include/acpi/cppc_acpi.h
> @@ -139,6 +139,7 @@ struct cppc_cpudata {  #ifdef CONFIG_ACPI_CPPC_LIB
> extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);  extern int
> cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
> +extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
>  extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
> extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);  extern int
> cppc_set_enable(int cpu, bool enable); @@ -165,6 +166,10 @@ static inline int
> cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)  {
>       return -ENOTSUPP;
>  }
> +static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
> +{
> +     return -ENOTSUPP;
> +}
>  static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs
> *perf_fb_ctrs)  {
>       return -ENOTSUPP;
> --
> 2.34.1

Reviewed-by: Perry Yuan <perry.yuan@....com>