linux-kernel - Re: [PATCH V2 1/2] cpufreq: ondemand: allow custom powersave_bias

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Message-ID: <20130402143543.GB19613@jshin-Toonie>
Date:	Tue, 2 Apr 2013 09:35:43 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	Borislav Petkov <bp@...en8.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	<cpufreq@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH V2 1/2] cpufreq: ondemand: allow custom
 powersave_bias_target function to be registered

On Tue, Apr 02, 2013 at 02:43:32PM +0200, Borislav Petkov wrote:
> On Thu, Mar 28, 2013 at 01:24:16PM -0500, Jacob Shin wrote:
> > This allows for another [arch specific] driver to hook into existing
> > powersave bias function of the ondemand governor. i.e. This allows AMD
> > specific powersave bias function (in a separate AMD specific driver)
> > to aid ondemand governor's frequency transition deicisions.
> > 
> > Signed-off-by: Jacob Shin <jacob.shin@....com>
> > ---
> >  drivers/cpufreq/cpufreq_governor.h |    3 +++
> >  drivers/cpufreq/cpufreq_ondemand.c |   22 +++++++++++++++++++---
> >  2 files changed, 22 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
> > index c83cabf..4b6808f 100644
> > --- a/drivers/cpufreq/cpufreq_governor.h
> > +++ b/drivers/cpufreq/cpufreq_governor.h
> > @@ -262,4 +262,7 @@ bool need_load_eval(struct cpu_dbs_common_info *cdbs,
> >  		unsigned int sampling_rate);
> >  int cpufreq_governor_dbs(struct cpufreq_policy *policy,
> >  		struct common_dbs_data *cdata, unsigned int event);
> > +void od_register_powersave_bias_function(unsigned int (*f)
> > +		(struct cpufreq_policy *, unsigned int, unsigned int));
> > +void od_unregister_powersave_bias_function(void);
> 
> We generally call those a "callback" or a "handler". I.e.,
> od_register_powersave_bias_handler or something.

Okay, will change.

> 
> >  #endif /* _CPUFREQ_GOVERNER_H */
> > diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> > index 15e80ee..36f0798 100644
> > --- a/drivers/cpufreq/cpufreq_ondemand.c
> > +++ b/drivers/cpufreq/cpufreq_ondemand.c
> > @@ -40,6 +40,8 @@
> >  
> >  static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
> >  
> > +static struct od_ops od_ops;
> > +
> >  #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
> >  static struct cpufreq_governor cpufreq_gov_ondemand;
> >  #endif
> > @@ -145,7 +147,8 @@ static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq)
> >  	struct od_dbs_tuners *od_tuners = dbs_data->tuners;
> >  
> >  	if (od_tuners->powersave_bias)
> > -		freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H);
> > +		freq = od_ops.powersave_bias_target(p, freq,
> > +				CPUFREQ_RELATION_H);
> >  	else if (p->cur == p->max)
> >  		return;
> >  
> > @@ -206,8 +209,8 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
> >  			__cpufreq_driver_target(policy, freq_next,
> >  					CPUFREQ_RELATION_L);
> >  		} else {
> > -			int freq = powersave_bias_target(policy, freq_next,
> > -					CPUFREQ_RELATION_L);
> > +			int freq = od_ops.powersave_bias_target(policy,
> > +					freq_next, CPUFREQ_RELATION_L);
> >  			__cpufreq_driver_target(policy, freq,
> >  					CPUFREQ_RELATION_L);
> >  		}
> > @@ -565,6 +568,19 @@ static struct common_dbs_data od_dbs_cdata = {
> >  	.exit = od_exit,
> >  };
> >  
> > +void od_register_powersave_bias_function(unsigned int (*f)
> > +		(struct cpufreq_policy *, unsigned int, unsigned int))
> > +{
> > +	od_ops.powersave_bias_target = f;
> > +}
> > +EXPORT_SYMBOL_GPL(od_register_powersave_bias_function);
> > +
> > +void od_unregister_powersave_bias_function(void)
> > +{
> > +	od_ops.powersave_bias_target = powersave_bias_target;
> 
> This is very confusing: we have ->powersave_bias_target and the default
> powersave_bias_target in the ondemand governor. Can we call the default
> one generic_powersave_bias_target or default_* or whatever.

Okay, will do.

Thanks!

> 
> Thanks.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --
> 

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