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There is no limitation in the ondemand or conservative governors which disallow the transition_latency to be greater than 10 ms. The max_transition_latency field is rather used to disallow automatic dynamic frequency switching for platforms which didn't wanted these governors to run. Replace max_transition_latency with a boolean (dynamic_switching) and check for transition_latency == CPUFREQ_ETERNAL along with that. This makes it pretty straight forward to read/understand now. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
186 lines
5.6 KiB
C
186 lines
5.6 KiB
C
/*
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* drivers/cpufreq/cpufreq_governor.h
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*
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* Header file for CPUFreq governors common code
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*
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* Copyright (C) 2001 Russell King
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* (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
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* (C) 2003 Jun Nakajima <jun.nakajima@intel.com>
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* (C) 2009 Alexander Clouter <alex@digriz.org.uk>
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* (c) 2012 Viresh Kumar <viresh.kumar@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _CPUFREQ_GOVERNOR_H
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#define _CPUFREQ_GOVERNOR_H
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#include <linux/atomic.h>
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#include <linux/irq_work.h>
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#include <linux/cpufreq.h>
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#include <linux/sched/cpufreq.h>
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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/* Ondemand Sampling types */
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enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
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/*
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* Abbreviations:
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* dbs: used as a shortform for demand based switching It helps to keep variable
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* names smaller, simpler
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* cdbs: common dbs
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* od_*: On-demand governor
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* cs_*: Conservative governor
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*/
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/* Governor demand based switching data (per-policy or global). */
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struct dbs_data {
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struct gov_attr_set attr_set;
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void *tuners;
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unsigned int ignore_nice_load;
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unsigned int sampling_rate;
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unsigned int sampling_down_factor;
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unsigned int up_threshold;
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unsigned int io_is_busy;
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};
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static inline struct dbs_data *to_dbs_data(struct gov_attr_set *attr_set)
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{
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return container_of(attr_set, struct dbs_data, attr_set);
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}
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#define gov_show_one(_gov, file_name) \
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static ssize_t show_##file_name \
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(struct gov_attr_set *attr_set, char *buf) \
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{ \
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struct dbs_data *dbs_data = to_dbs_data(attr_set); \
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struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \
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return sprintf(buf, "%u\n", tuners->file_name); \
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}
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#define gov_show_one_common(file_name) \
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static ssize_t show_##file_name \
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(struct gov_attr_set *attr_set, char *buf) \
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{ \
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struct dbs_data *dbs_data = to_dbs_data(attr_set); \
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return sprintf(buf, "%u\n", dbs_data->file_name); \
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}
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#define gov_attr_ro(_name) \
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static struct governor_attr _name = \
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__ATTR(_name, 0444, show_##_name, NULL)
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#define gov_attr_rw(_name) \
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static struct governor_attr _name = \
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__ATTR(_name, 0644, show_##_name, store_##_name)
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/* Common to all CPUs of a policy */
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struct policy_dbs_info {
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struct cpufreq_policy *policy;
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/*
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* Per policy mutex that serializes load evaluation from limit-change
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* and work-handler.
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*/
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struct mutex update_mutex;
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u64 last_sample_time;
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s64 sample_delay_ns;
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atomic_t work_count;
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struct irq_work irq_work;
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struct work_struct work;
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/* dbs_data may be shared between multiple policy objects */
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struct dbs_data *dbs_data;
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struct list_head list;
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/* Multiplier for increasing sample delay temporarily. */
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unsigned int rate_mult;
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unsigned int idle_periods; /* For conservative */
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/* Status indicators */
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bool is_shared; /* This object is used by multiple CPUs */
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bool work_in_progress; /* Work is being queued up or in progress */
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};
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static inline void gov_update_sample_delay(struct policy_dbs_info *policy_dbs,
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unsigned int delay_us)
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{
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policy_dbs->sample_delay_ns = delay_us * NSEC_PER_USEC;
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}
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/* Per cpu structures */
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struct cpu_dbs_info {
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u64 prev_cpu_idle;
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u64 prev_update_time;
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u64 prev_cpu_nice;
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/*
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* Used to keep track of load in the previous interval. However, when
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* explicitly set to zero, it is used as a flag to ensure that we copy
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* the previous load to the current interval only once, upon the first
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* wake-up from idle.
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*/
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unsigned int prev_load;
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struct update_util_data update_util;
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struct policy_dbs_info *policy_dbs;
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};
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/* Common Governor data across policies */
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struct dbs_governor {
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struct cpufreq_governor gov;
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struct kobj_type kobj_type;
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/*
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* Common data for platforms that don't set
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* CPUFREQ_HAVE_GOVERNOR_PER_POLICY
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*/
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struct dbs_data *gdbs_data;
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unsigned int (*gov_dbs_update)(struct cpufreq_policy *policy);
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struct policy_dbs_info *(*alloc)(void);
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void (*free)(struct policy_dbs_info *policy_dbs);
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int (*init)(struct dbs_data *dbs_data);
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void (*exit)(struct dbs_data *dbs_data);
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void (*start)(struct cpufreq_policy *policy);
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};
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static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy)
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{
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return container_of(policy->governor, struct dbs_governor, gov);
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}
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/* Governor callback routines */
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int cpufreq_dbs_governor_init(struct cpufreq_policy *policy);
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void cpufreq_dbs_governor_exit(struct cpufreq_policy *policy);
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int cpufreq_dbs_governor_start(struct cpufreq_policy *policy);
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void cpufreq_dbs_governor_stop(struct cpufreq_policy *policy);
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void cpufreq_dbs_governor_limits(struct cpufreq_policy *policy);
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#define CPUFREQ_DBS_GOVERNOR_INITIALIZER(_name_) \
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{ \
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.name = _name_, \
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.dynamic_switching = true, \
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.owner = THIS_MODULE, \
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.init = cpufreq_dbs_governor_init, \
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.exit = cpufreq_dbs_governor_exit, \
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.start = cpufreq_dbs_governor_start, \
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.stop = cpufreq_dbs_governor_stop, \
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.limits = cpufreq_dbs_governor_limits, \
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}
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/* Governor specific operations */
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struct od_ops {
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unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy,
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unsigned int freq_next, unsigned int relation);
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};
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unsigned int dbs_update(struct cpufreq_policy *policy);
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void od_register_powersave_bias_handler(unsigned int (*f)
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(struct cpufreq_policy *, unsigned int, unsigned int),
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unsigned int powersave_bias);
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void od_unregister_powersave_bias_handler(void);
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ssize_t store_sampling_rate(struct gov_attr_set *attr_set, const char *buf,
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size_t count);
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void gov_update_cpu_data(struct dbs_data *dbs_data);
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#endif /* _CPUFREQ_GOVERNOR_H */
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