mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Viresh Kumar](/assets/img/avatar_default.png)
Some part of cs_dbs_timer() and od_dbs_timer() is exactly same and is unnecessarily duplicated. Create the real work-handler in cpufreq_governor.c and put the common code in this routine (dbs_timer()). Shouldn't make any functional change. Reviewed-and-tested-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
282 lines
8.4 KiB
C
282 lines
8.4 KiB
C
/*
|
|
* drivers/cpufreq/cpufreq_governor.h
|
|
*
|
|
* Header file for CPUFreq governors common code
|
|
*
|
|
* Copyright (C) 2001 Russell King
|
|
* (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
|
|
* (C) 2003 Jun Nakajima <jun.nakajima@intel.com>
|
|
* (C) 2009 Alexander Clouter <alex@digriz.org.uk>
|
|
* (c) 2012 Viresh Kumar <viresh.kumar@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef _CPUFREQ_GOVERNOR_H
|
|
#define _CPUFREQ_GOVERNOR_H
|
|
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mutex.h>
|
|
|
|
/*
|
|
* The polling frequency depends on the capability of the processor. Default
|
|
* polling frequency is 1000 times the transition latency of the processor. The
|
|
* governor will work on any processor with transition latency <= 10ms, using
|
|
* appropriate sampling rate.
|
|
*
|
|
* For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL)
|
|
* this governor will not work. All times here are in us (micro seconds).
|
|
*/
|
|
#define MIN_SAMPLING_RATE_RATIO (2)
|
|
#define LATENCY_MULTIPLIER (1000)
|
|
#define MIN_LATENCY_MULTIPLIER (20)
|
|
#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
|
|
|
|
/* Ondemand Sampling types */
|
|
enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
|
|
|
|
/*
|
|
* Macro for creating governors sysfs routines
|
|
*
|
|
* - gov_sys: One governor instance per whole system
|
|
* - gov_pol: One governor instance per policy
|
|
*/
|
|
|
|
/* Create attributes */
|
|
#define gov_sys_attr_ro(_name) \
|
|
static struct global_attr _name##_gov_sys = \
|
|
__ATTR(_name, 0444, show_##_name##_gov_sys, NULL)
|
|
|
|
#define gov_sys_attr_rw(_name) \
|
|
static struct global_attr _name##_gov_sys = \
|
|
__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
|
|
|
|
#define gov_pol_attr_ro(_name) \
|
|
static struct freq_attr _name##_gov_pol = \
|
|
__ATTR(_name, 0444, show_##_name##_gov_pol, NULL)
|
|
|
|
#define gov_pol_attr_rw(_name) \
|
|
static struct freq_attr _name##_gov_pol = \
|
|
__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
|
|
|
|
#define gov_sys_pol_attr_rw(_name) \
|
|
gov_sys_attr_rw(_name); \
|
|
gov_pol_attr_rw(_name)
|
|
|
|
#define gov_sys_pol_attr_ro(_name) \
|
|
gov_sys_attr_ro(_name); \
|
|
gov_pol_attr_ro(_name)
|
|
|
|
/* Create show/store routines */
|
|
#define show_one(_gov, file_name) \
|
|
static ssize_t show_##file_name##_gov_sys \
|
|
(struct kobject *kobj, struct attribute *attr, char *buf) \
|
|
{ \
|
|
struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \
|
|
return sprintf(buf, "%u\n", tuners->file_name); \
|
|
} \
|
|
\
|
|
static ssize_t show_##file_name##_gov_pol \
|
|
(struct cpufreq_policy *policy, char *buf) \
|
|
{ \
|
|
struct dbs_data *dbs_data = policy->governor_data; \
|
|
struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \
|
|
return sprintf(buf, "%u\n", tuners->file_name); \
|
|
}
|
|
|
|
#define store_one(_gov, file_name) \
|
|
static ssize_t store_##file_name##_gov_sys \
|
|
(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \
|
|
{ \
|
|
struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
|
|
return store_##file_name(dbs_data, buf, count); \
|
|
} \
|
|
\
|
|
static ssize_t store_##file_name##_gov_pol \
|
|
(struct cpufreq_policy *policy, const char *buf, size_t count) \
|
|
{ \
|
|
struct dbs_data *dbs_data = policy->governor_data; \
|
|
return store_##file_name(dbs_data, buf, count); \
|
|
}
|
|
|
|
#define show_store_one(_gov, file_name) \
|
|
show_one(_gov, file_name); \
|
|
store_one(_gov, file_name)
|
|
|
|
/* create helper routines */
|
|
#define define_get_cpu_dbs_routines(_dbs_info) \
|
|
static struct cpu_dbs_info *get_cpu_cdbs(int cpu) \
|
|
{ \
|
|
return &per_cpu(_dbs_info, cpu).cdbs; \
|
|
} \
|
|
\
|
|
static void *get_cpu_dbs_info_s(int cpu) \
|
|
{ \
|
|
return &per_cpu(_dbs_info, cpu); \
|
|
}
|
|
|
|
/*
|
|
* Abbreviations:
|
|
* dbs: used as a shortform for demand based switching It helps to keep variable
|
|
* names smaller, simpler
|
|
* cdbs: common dbs
|
|
* od_*: On-demand governor
|
|
* cs_*: Conservative governor
|
|
*/
|
|
|
|
/* Common to all CPUs of a policy */
|
|
struct cpu_common_dbs_info {
|
|
struct cpufreq_policy *policy;
|
|
/*
|
|
* percpu mutex that serializes governor limit change with dbs_timer
|
|
* invocation. We do not want dbs_timer to run when user is changing
|
|
* the governor or limits.
|
|
*/
|
|
struct mutex timer_mutex;
|
|
ktime_t time_stamp;
|
|
};
|
|
|
|
/* Per cpu structures */
|
|
struct cpu_dbs_info {
|
|
u64 prev_cpu_idle;
|
|
u64 prev_cpu_wall;
|
|
u64 prev_cpu_nice;
|
|
/*
|
|
* Used to keep track of load in the previous interval. However, when
|
|
* explicitly set to zero, it is used as a flag to ensure that we copy
|
|
* the previous load to the current interval only once, upon the first
|
|
* wake-up from idle.
|
|
*/
|
|
unsigned int prev_load;
|
|
struct delayed_work dwork;
|
|
struct cpu_common_dbs_info *shared;
|
|
};
|
|
|
|
struct od_cpu_dbs_info_s {
|
|
struct cpu_dbs_info cdbs;
|
|
struct cpufreq_frequency_table *freq_table;
|
|
unsigned int freq_lo;
|
|
unsigned int freq_lo_jiffies;
|
|
unsigned int freq_hi_jiffies;
|
|
unsigned int rate_mult;
|
|
unsigned int sample_type:1;
|
|
};
|
|
|
|
struct cs_cpu_dbs_info_s {
|
|
struct cpu_dbs_info cdbs;
|
|
unsigned int down_skip;
|
|
unsigned int requested_freq;
|
|
unsigned int enable:1;
|
|
};
|
|
|
|
/* Per policy Governors sysfs tunables */
|
|
struct od_dbs_tuners {
|
|
unsigned int ignore_nice_load;
|
|
unsigned int sampling_rate;
|
|
unsigned int sampling_down_factor;
|
|
unsigned int up_threshold;
|
|
unsigned int powersave_bias;
|
|
unsigned int io_is_busy;
|
|
};
|
|
|
|
struct cs_dbs_tuners {
|
|
unsigned int ignore_nice_load;
|
|
unsigned int sampling_rate;
|
|
unsigned int sampling_down_factor;
|
|
unsigned int up_threshold;
|
|
unsigned int down_threshold;
|
|
unsigned int freq_step;
|
|
};
|
|
|
|
/* Common Governor data across policies */
|
|
struct dbs_data;
|
|
struct common_dbs_data {
|
|
/* Common across governors */
|
|
#define GOV_ONDEMAND 0
|
|
#define GOV_CONSERVATIVE 1
|
|
int governor;
|
|
struct attribute_group *attr_group_gov_sys; /* one governor - system */
|
|
struct attribute_group *attr_group_gov_pol; /* one governor - policy */
|
|
|
|
/*
|
|
* Common data for platforms that don't set
|
|
* CPUFREQ_HAVE_GOVERNOR_PER_POLICY
|
|
*/
|
|
struct dbs_data *gdbs_data;
|
|
|
|
struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu);
|
|
void *(*get_cpu_dbs_info_s)(int cpu);
|
|
unsigned int (*gov_dbs_timer)(struct cpu_dbs_info *cdbs,
|
|
struct dbs_data *dbs_data,
|
|
bool modify_all);
|
|
void (*gov_check_cpu)(int cpu, unsigned int load);
|
|
int (*init)(struct dbs_data *dbs_data, bool notify);
|
|
void (*exit)(struct dbs_data *dbs_data, bool notify);
|
|
|
|
/* Governor specific ops, see below */
|
|
void *gov_ops;
|
|
|
|
/*
|
|
* Protects governor's data (struct dbs_data and struct common_dbs_data)
|
|
*/
|
|
struct mutex mutex;
|
|
};
|
|
|
|
/* Governor Per policy data */
|
|
struct dbs_data {
|
|
struct common_dbs_data *cdata;
|
|
unsigned int min_sampling_rate;
|
|
int usage_count;
|
|
void *tuners;
|
|
};
|
|
|
|
/* Governor specific ops, will be passed to dbs_data->gov_ops */
|
|
struct od_ops {
|
|
void (*powersave_bias_init_cpu)(int cpu);
|
|
unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
|
|
unsigned int freq_next, unsigned int relation);
|
|
void (*freq_increase)(struct cpufreq_policy *policy, unsigned int freq);
|
|
};
|
|
|
|
static inline int delay_for_sampling_rate(unsigned int sampling_rate)
|
|
{
|
|
int delay = usecs_to_jiffies(sampling_rate);
|
|
|
|
/* We want all CPUs to do sampling nearly on same jiffy */
|
|
if (num_online_cpus() > 1)
|
|
delay -= jiffies % delay;
|
|
|
|
return delay;
|
|
}
|
|
|
|
#define declare_show_sampling_rate_min(_gov) \
|
|
static ssize_t show_sampling_rate_min_gov_sys \
|
|
(struct kobject *kobj, struct attribute *attr, char *buf) \
|
|
{ \
|
|
struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
|
|
return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
|
|
} \
|
|
\
|
|
static ssize_t show_sampling_rate_min_gov_pol \
|
|
(struct cpufreq_policy *policy, char *buf) \
|
|
{ \
|
|
struct dbs_data *dbs_data = policy->governor_data; \
|
|
return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
|
|
}
|
|
|
|
extern struct mutex cpufreq_governor_lock;
|
|
|
|
void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
|
|
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 */
|