179 lines
4.9 KiB
C
179 lines
4.9 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_GOVERNER_H
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#define _CPUFREQ_GOVERNER_H
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#include <linux/cpufreq.h>
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#include <linux/kobject.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/sysfs.h>
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/*
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* The polling frequency depends on the capability of the processor. Default
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* polling frequency is 1000 times the transition latency of the processor. The
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* governor will work on any processor with transition latency <= 10mS, using
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* appropriate sampling rate.
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*
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* For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL)
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* this governor will not work. All times here are in uS.
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*/
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#define MIN_SAMPLING_RATE_RATIO (2)
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#define LATENCY_MULTIPLIER (1000)
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#define MIN_LATENCY_MULTIPLIER (100)
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#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
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/* Ondemand Sampling types */
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enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE};
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/* Macro creating sysfs show routines */
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#define show_one(_gov, file_name, object) \
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static ssize_t show_##file_name \
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(struct kobject *kobj, struct attribute *attr, char *buf) \
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{ \
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return sprintf(buf, "%u\n", _gov##_tuners.object); \
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}
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#define define_get_cpu_dbs_routines(_dbs_info) \
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static struct cpu_dbs_common_info *get_cpu_cdbs(int cpu) \
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{ \
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return &per_cpu(_dbs_info, cpu).cdbs; \
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} \
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\
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static void *get_cpu_dbs_info_s(int cpu) \
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{ \
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return &per_cpu(_dbs_info, cpu); \
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}
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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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/* Per cpu structures */
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struct cpu_dbs_common_info {
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int cpu;
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u64 prev_cpu_idle;
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u64 prev_cpu_wall;
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u64 prev_cpu_nice;
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struct cpufreq_policy *cur_policy;
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struct delayed_work work;
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/*
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* percpu mutex that serializes governor limit change with gov_dbs_timer
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* invocation. We do not want gov_dbs_timer to run when user is changing
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* the governor or limits.
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*/
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struct mutex timer_mutex;
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ktime_t time_stamp;
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};
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struct od_cpu_dbs_info_s {
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struct cpu_dbs_common_info cdbs;
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u64 prev_cpu_iowait;
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struct cpufreq_frequency_table *freq_table;
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unsigned int freq_lo;
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unsigned int freq_lo_jiffies;
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unsigned int freq_hi_jiffies;
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unsigned int rate_mult;
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unsigned int sample_type:1;
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};
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struct cs_cpu_dbs_info_s {
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struct cpu_dbs_common_info cdbs;
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unsigned int down_skip;
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unsigned int requested_freq;
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unsigned int enable:1;
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};
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/* Governers sysfs tunables */
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struct od_dbs_tuners {
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unsigned int ignore_nice;
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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 adj_up_threshold;
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unsigned int powersave_bias;
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unsigned int io_is_busy;
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};
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struct cs_dbs_tuners {
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unsigned int ignore_nice;
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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 down_threshold;
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unsigned int freq_step;
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};
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/* Per Governer data */
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struct dbs_data {
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/* Common across governors */
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#define GOV_ONDEMAND 0
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#define GOV_CONSERVATIVE 1
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int governor;
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unsigned int min_sampling_rate;
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struct attribute_group *attr_group;
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void *tuners;
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/* dbs_mutex protects dbs_enable in governor start/stop */
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struct mutex mutex;
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struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu);
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void *(*get_cpu_dbs_info_s)(int cpu);
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void (*gov_dbs_timer)(struct work_struct *work);
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void (*gov_check_cpu)(int cpu, unsigned int load);
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/* Governor specific ops, see below */
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void *gov_ops;
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};
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/* Governor specific ops, will be passed to dbs_data->gov_ops */
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struct od_ops {
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int (*io_busy)(void);
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void (*powersave_bias_init_cpu)(int cpu);
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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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void (*freq_increase)(struct cpufreq_policy *p, unsigned int freq);
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};
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struct cs_ops {
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struct notifier_block *notifier_block;
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};
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static inline int delay_for_sampling_rate(unsigned int sampling_rate)
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{
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int delay = usecs_to_jiffies(sampling_rate);
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/* We want all CPUs to do sampling nearly on same jiffy */
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if (num_online_cpus() > 1)
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delay -= jiffies % delay;
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return delay;
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}
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u64 get_cpu_idle_time(unsigned int cpu, u64 *wall);
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void dbs_check_cpu(struct dbs_data *dbs_data, int cpu);
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bool need_load_eval(struct cpu_dbs_common_info *cdbs,
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unsigned int sampling_rate);
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int cpufreq_governor_dbs(struct dbs_data *dbs_data,
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struct cpufreq_policy *policy, unsigned int event);
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#endif /* _CPUFREQ_GOVERNER_H */
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