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cpufreq: ondemand: allow custom powersave_bias_target handler to be registered

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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@amd.com>
Acked-by: Thomas Renninger <trenn@suse.de>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jacob Shin 2013-04-02 09:56:56 -05:00 committed by Rafael J. Wysocki
parent 5800043b24
commit fb30809efa
2 changed files with 57 additions and 8 deletions
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4
drivers/cpufreq/cpufreq_governor.h
View file

@ -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_GOVERNER_H */

61
drivers/cpufreq/cpufreq_ondemand.c
View file

@ -24,6 +24,7 @@
#include <linux/sysfs.h>
#include <linux/tick.h>
#include <linux/types.h>
#include <linux/cpu.h>
#include "cpufreq_governor.h"
@ -40,6 +41,8 @@
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 +83,7 @@ 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 +148,8 @@ 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 +209,12 @@ 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 +561,7 @@ 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 +578,47 @@ 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);
get_online_cpus();
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);
}
put_online_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)
{