linux-kernel - Re: [PATCH 16/19] cpupower: enable boost state support for amd-pstate module

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Date:   Wed, 8 Sep 2021 12:32:37 -0500
From:   "Fontenot, Nathan" <Nathan.Fontenot@....com>
To:     Huang Rui <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...nel.org>,
        linux-pm@...r.kernel.org
Cc:     Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 16/19] cpupower: enable boost state support for amd-pstate
 module

On 9/8/2021 9:59 AM, Huang Rui wrote:
> The AMD P-state boost API is different from ACPI hardware P-states, so
> implement the support for amd-pstate kernel module.
> 
> Signed-off-by: Huang Rui <ray.huang@....com>
> ---
>  tools/power/cpupower/lib/cpufreq.c        | 20 ++++++++++++++++++++
>  tools/power/cpupower/lib/cpufreq.h        |  3 +++
>  tools/power/cpupower/utils/helpers/misc.c |  7 +++++++
>  3 files changed, 30 insertions(+)
> 
> diff --git a/tools/power/cpupower/lib/cpufreq.c b/tools/power/cpupower/lib/cpufreq.c
> index 3f92ddadaad2..37da87bdcfb1 100644
> --- a/tools/power/cpupower/lib/cpufreq.c
> +++ b/tools/power/cpupower/lib/cpufreq.c
> @@ -790,3 +790,23 @@ unsigned long cpufreq_get_transitions(unsigned int cpu)
>  {
>  	return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS);
>  }
> +
> +int amd_pstate_boost_support(unsigned int cpu)
> +{
> +	unsigned int highest_perf, nominal_perf;
> +
> +	highest_perf = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_HIGHEST_PERF);
> +	nominal_perf = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_NOMINAL_PERF);
> +
> +	return highest_perf > nominal_perf ? 1 : 0;
> +}
> +
> +int amd_pstate_boost_enabled(unsigned int cpu)
> +{
> +	unsigned int cpuinfo_max, amd_pstate_max;
> +
> +	cpuinfo_max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ);
> +	amd_pstate_max = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_MAX_FREQ);
> +
> +	return cpuinfo_max == amd_pstate_max ? 1 : 0;
> +}
> diff --git a/tools/power/cpupower/lib/cpufreq.h b/tools/power/cpupower/lib/cpufreq.h
> index 95f4fd9e2656..d54d02a7a4f4 100644
> --- a/tools/power/cpupower/lib/cpufreq.h
> +++ b/tools/power/cpupower/lib/cpufreq.h
> @@ -203,6 +203,9 @@ int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
>  int cpufreq_set_frequency(unsigned int cpu,
>  				unsigned long target_frequency);
>  
> +int amd_pstate_boost_support(unsigned int cpu);
> +int amd_pstate_boost_enabled(unsigned int cpu);
> +
>  #ifdef __cplusplus
>  }
>  #endif
> diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
> index 07d80775fb68..aba979320760 100644
> --- a/tools/power/cpupower/utils/helpers/misc.c
> +++ b/tools/power/cpupower/utils/helpers/misc.c
> @@ -10,6 +10,7 @@
>  #if defined(__i386__) || defined(__x86_64__)
>  
>  #include "cpupower_intern.h"
> +#include "cpufreq.h"
>  
>  #define MSR_AMD_HWCR	0xc0010015
>  
> @@ -39,6 +40,12 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
>  			if (ret)
>  				return ret;
>  		}
> +	} if ((cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATE) &&

Shouldn't this be

	} else if ((cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATE) &&

-Nathan

> +	      amd_pstate_boost_support(cpu)) {
> +		*support = 1;
> +
> +		if (amd_pstate_boost_enabled(cpu))
> +			*active = 1;
>  	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
>  		*support = *active = 1;
>  	return 0;
> -- 
> 2.25.1
>