mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Rafael J. Wysocki](/assets/img/avatar_default.png)
That mutex is only used by cpufreq_governor_dbs() and it doesn't need to be exported to modules, so make it static and drop the export incantation. No functional changes. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
190 lines
5.7 KiB
C
190 lines
5.7 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/atomic.h>
|
|
#include <linux/irq_work.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};
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
/* Governor demand based switching data (per-policy or global). */
|
|
struct dbs_data {
|
|
int usage_count;
|
|
void *tuners;
|
|
unsigned int min_sampling_rate;
|
|
unsigned int ignore_nice_load;
|
|
unsigned int sampling_rate;
|
|
unsigned int sampling_down_factor;
|
|
unsigned int up_threshold;
|
|
unsigned int io_is_busy;
|
|
|
|
struct kobject kobj;
|
|
struct list_head policy_dbs_list;
|
|
/*
|
|
* Protect concurrent updates to governor tunables from sysfs,
|
|
* policy_dbs_list and usage_count.
|
|
*/
|
|
struct mutex mutex;
|
|
};
|
|
|
|
/* Governor's specific attributes */
|
|
struct dbs_data;
|
|
struct governor_attr {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct dbs_data *dbs_data, char *buf);
|
|
ssize_t (*store)(struct dbs_data *dbs_data, const char *buf,
|
|
size_t count);
|
|
};
|
|
|
|
#define gov_show_one(_gov, file_name) \
|
|
static ssize_t show_##file_name \
|
|
(struct dbs_data *dbs_data, char *buf) \
|
|
{ \
|
|
struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \
|
|
return sprintf(buf, "%u\n", tuners->file_name); \
|
|
}
|
|
|
|
#define gov_show_one_common(file_name) \
|
|
static ssize_t show_##file_name \
|
|
(struct dbs_data *dbs_data, char *buf) \
|
|
{ \
|
|
return sprintf(buf, "%u\n", dbs_data->file_name); \
|
|
}
|
|
|
|
#define gov_attr_ro(_name) \
|
|
static struct governor_attr _name = \
|
|
__ATTR(_name, 0444, show_##_name, NULL)
|
|
|
|
#define gov_attr_rw(_name) \
|
|
static struct governor_attr _name = \
|
|
__ATTR(_name, 0644, show_##_name, store_##_name)
|
|
|
|
/* Common to all CPUs of a policy */
|
|
struct policy_dbs_info {
|
|
struct cpufreq_policy *policy;
|
|
/*
|
|
* Per policy mutex that serializes load evaluation from limit-change
|
|
* and work-handler.
|
|
*/
|
|
struct mutex timer_mutex;
|
|
|
|
u64 last_sample_time;
|
|
s64 sample_delay_ns;
|
|
atomic_t work_count;
|
|
struct irq_work irq_work;
|
|
struct work_struct work;
|
|
/* dbs_data may be shared between multiple policy objects */
|
|
struct dbs_data *dbs_data;
|
|
struct list_head list;
|
|
/* Multiplier for increasing sample delay temporarily. */
|
|
unsigned int rate_mult;
|
|
/* Status indicators */
|
|
bool is_shared; /* This object is used by multiple CPUs */
|
|
bool work_in_progress; /* Work is being queued up or in progress */
|
|
};
|
|
|
|
static inline void gov_update_sample_delay(struct policy_dbs_info *policy_dbs,
|
|
unsigned int delay_us)
|
|
{
|
|
policy_dbs->sample_delay_ns = delay_us * NSEC_PER_USEC;
|
|
}
|
|
|
|
/* 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 update_util_data update_util;
|
|
struct policy_dbs_info *policy_dbs;
|
|
};
|
|
|
|
/* Common Governor data across policies */
|
|
struct dbs_governor {
|
|
struct cpufreq_governor gov;
|
|
struct kobj_type kobj_type;
|
|
|
|
/*
|
|
* Common data for platforms that don't set
|
|
* CPUFREQ_HAVE_GOVERNOR_PER_POLICY
|
|
*/
|
|
struct dbs_data *gdbs_data;
|
|
|
|
unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy);
|
|
struct policy_dbs_info *(*alloc)(void);
|
|
void (*free)(struct policy_dbs_info *policy_dbs);
|
|
int (*init)(struct dbs_data *dbs_data, bool notify);
|
|
void (*exit)(struct dbs_data *dbs_data, bool notify);
|
|
void (*start)(struct cpufreq_policy *policy);
|
|
};
|
|
|
|
static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy)
|
|
{
|
|
return container_of(policy->governor, struct dbs_governor, gov);
|
|
}
|
|
|
|
/* Governor specific operations */
|
|
struct od_ops {
|
|
unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
|
|
unsigned int freq_next, unsigned int relation);
|
|
};
|
|
|
|
unsigned int dbs_update(struct cpufreq_policy *policy);
|
|
int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
|
|
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);
|
|
ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
|
|
size_t count);
|
|
void gov_update_cpu_data(struct dbs_data *dbs_data);
|
|
#endif /* _CPUFREQ_GOVERNOR_H */
|