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

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Date:   Thu, 9 Sep 2021 17:59:33 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Fontenot, Nathan" <Nathan.Fontenot@....com>
CC:     "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" <linux-pm@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 16/19] cpupower: enable boost state support for
 amd-pstate module

On Thu, Sep 09, 2021 at 01:32:37AM +0800, Fontenot, Nathan wrote:
> 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) &&
> 

Nice catch, it's my typo.

Thanks,
Ray