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Date: Thu, 4 Apr 2013 12:18:04 -0500
From: Jacob Shin <jacob.shin@....com>
To: Viresh Kumar <viresh.kumar@...aro.org>
CC: "Rafael J. Wysocki" <rjw@...k.pl>, <cpufreq@...r.kernel.org>,
<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Thomas Renninger <trenn@...e.de>,
Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH V4 1/2] cpufreq: ondemand: allow custom
powersave_bias_target handler to be registered
On Thu, Apr 04, 2013 at 10:06:35PM +0530, Viresh Kumar wrote:
> On 4 April 2013 21:49, Jacob Shin <jacob.shin@....com> wrote:
> > diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
>
> > +static void od_set_powersave_bias(unsigned int powersave_bias)
> > +{
> > + unsigned int cpu;
> > + struct od_dbs_tuners *od_tuners;
> > +
> > + if (!have_governor_per_policy()) {
> > + od_tuners = od_dbs_cdata.gdbs_data->tuners;
> > + od_tuners->powersave_bias = powersave_bias;
> > + return;
> > + }
> > +
> > + for_each_online_cpu(cpu) {
> > + struct cpufreq_policy *policy;
> > + struct dbs_data *dbs_data;
> > + policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy;
> > + dbs_data = policy->governor_data;
> > + od_tuners = dbs_data->tuners;
> > + od_tuners->powersave_bias = powersave_bias;
> > + }
>
> You can keep only the for_each_online_cpu() loop and remove the other
> one. And in that one also, you don't have to do this for every cpu...
>
> something like this will help you...
>
> cpus_processed = NULL;
>
> for_each_online_cpu(cpu) {
> if cpu-is-present-in cpus_processed
> continue;
>
> cpu-set-mask(cpus_processed, policy->cpus);
>
> }
>
> Syntax is poor, please choose the correct one.
Ah okay, thanks for the hint, here:
>From 59728d09d0dc5403c9bb0238336ecb367c04694f Mon Sep 17 00:00:00 2001
From: Jacob Shin <jacob.shin@....com>
Date: Tue, 2 Apr 2013 09:56:56 -0500
Subject: [PATCH 1/2] cpufreq: ondemand: allow custom powersave_bias_target
handler to be registered
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 decisions.
Signed-off-by: Jacob Shin <jacob.shin@....com>
---
drivers/cpufreq/cpufreq_governor.h | 4 +++
drivers/cpufreq/cpufreq_ondemand.c | 58 +++++++++++++++++++++++++++++++-----
2 files changed, 54 insertions(+), 8 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index 6593769..8ac3353 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -263,4 +263,8 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
struct common_dbs_data *cdata, unsigned int event);
void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
unsigned int delay, bool all_cpus);
+void od_register_powersave_bias_handler(unsigned int (*f)
+ (struct cpufreq_policy *, unsigned int, unsigned int),
+ unsigned int powersave_bias);
+void od_unregister_powersave_bias_handler(void);
#endif /* _CPUFREQ_GOVERNOR_H */
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 1471478..80fb624 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
@@ -80,7 +82,7 @@ static int should_io_be_busy(void)
* Returns the freq_hi to be used right now and will set freq_hi_jiffies,
* freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
*/
-static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
+static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
unsigned int freq_next, unsigned int relation)
{
unsigned int freq_req, freq_reduc, freq_avg;
@@ -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;
@@ -205,12 +208,12 @@ static void od_check_cpu(int cpu, unsigned int load_freq)
if (!od_tuners->powersave_bias) {
__cpufreq_driver_target(policy, freq_next,
CPUFREQ_RELATION_L);
- } else {
- int freq = powersave_bias_target(policy, freq_next,
- CPUFREQ_RELATION_L);
- __cpufreq_driver_target(policy, freq,
- CPUFREQ_RELATION_L);
+ return;
}
+
+ freq_next = od_ops.powersave_bias_target(policy, freq_next,
+ CPUFREQ_RELATION_L);
+ __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
}
}
@@ -557,7 +560,7 @@ define_get_cpu_dbs_routines(od_cpu_dbs_info);
static struct od_ops od_ops = {
.powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
- .powersave_bias_target = powersave_bias_target,
+ .powersave_bias_target = generic_powersave_bias_target,
.freq_increase = dbs_freq_increase,
};
@@ -574,6 +577,45 @@ static struct common_dbs_data od_dbs_cdata = {
.exit = od_exit,
};
+static void od_set_powersave_bias(unsigned int powersave_bias)
+{
+ struct cpufreq_policy *policy;
+ struct dbs_data *dbs_data;
+ struct od_dbs_tuners *od_tuners;
+ unsigned int cpu;
+ cpumask_t done;
+
+ cpumask_clear(&done);
+
+ for_each_online_cpu(cpu) {
+ if (cpumask_test_cpu(cpu, &done))
+ continue;
+
+ policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy;
+ dbs_data = policy->governor_data;
+ od_tuners = dbs_data->tuners;
+ od_tuners->powersave_bias = powersave_bias;
+
+ cpumask_or(&done, &done, policy->cpus);
+ }
+}
+
+void od_register_powersave_bias_handler(unsigned int (*f)
+ (struct cpufreq_policy *, unsigned int, unsigned int),
+ unsigned int powersave_bias)
+{
+ od_ops.powersave_bias_target = f;
+ od_set_powersave_bias(powersave_bias);
+}
+EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
+
+void od_unregister_powersave_bias_handler(void)
+{
+ od_ops.powersave_bias_target = generic_powersave_bias_target;
+ od_set_powersave_bias(0);
+}
+EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
+
static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
unsigned int event)
{
--
1.7.9.5
--
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