linux-kernel - Re: [PATCH RFC 1/3] Add interface to receive current cpu power

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Date:	Fri, 5 Jul 2013 09:49:41 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Konstantin Krivyakin <k.krivyakin@...sung.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, viresh.kumar@...aro.org,
	mingo@...hat.com, Peter Zijlstra <peterz@...radead.org>
Cc:	i.zhbanov@...sung.com, e.voevodin@...sung.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/3] Add interface to receive current cpu power

+ cpufreq maintainers

On Fri, Jul 5, 2013 at 12:17 AM, Konstantin Krivyakin
<k.krivyakin@...sung.com> wrote:
> Signed-off-by: Konstantin Krivyakin <k.krivyakin@...sung.com>
> ---
>  drivers/cpufreq/cpufreq.c |   17 +++++++++++++++++
>  include/linux/cpufreq.h   |    6 ++++++
>  2 files changed, 23 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 6a015ad..4180e89 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1538,6 +1538,23 @@ int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
>  }
>  EXPORT_SYMBOL(cpufreq_unregister_notifier);
>
> +/**
> + * cpu_power_get - get current CPU power
> + * @cpu: CPU number
> + */
> +u64 cpu_power_get(int cpu)
> +{
> +       struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
> +       u64 ret_power = 0;
> +
> +       if (policy) {
> +               ret_power = policy->current_power;
> +               cpufreq_cpu_put(policy);
> +       }
> +
> +       return ret_power;
> +}
> +EXPORT_SYMBOL(cpu_power_get);
>
>  /*********************************************************************
>   *                              GOVERNORS                            *
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 4d7390b..67323af 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -107,6 +107,7 @@ struct cpufreq_policy {
>         unsigned int            max;    /* in kHz */
>         unsigned int            cur;    /* in kHz, only needed if cpufreq
>                                          * governors are used */
> +       u64                     current_power;
>         unsigned int            policy; /* see above */
>         struct cpufreq_governor *governor; /* see below */
>         void                    *governor_data;
> @@ -365,6 +366,7 @@ static inline unsigned int cpufreq_get(unsigned int cpu)
>  #ifdef CONFIG_CPU_FREQ
>  unsigned int cpufreq_quick_get(unsigned int cpu);
>  unsigned int cpufreq_quick_get_max(unsigned int cpu);
> +u64 cpu_power_get(int cpu);
>  #else
>  static inline unsigned int cpufreq_quick_get(unsigned int cpu)
>  {
> @@ -374,6 +376,10 @@ static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
>  {
>         return 0;
>  }
> +static inline u64 cpu_power_get(unsigned int cpu)
> +{
> +       return 0;
> +}
>  #endif
>
>  /*********************************************************************
> --
> 1.7.9.5
>
> --
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