07aa4402a0
Do not convert microseconds to jiffies and the other way around in governor computations related to the sampling rate and sample delay and drop delay_for_sampling_rate() which isn't of any use then. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
236 lines
6.7 KiB
C
236 lines
6.7 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/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/mutex.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 (micro seconds).
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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 (20)
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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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/* create helper routines */
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#define define_get_cpu_dbs_routines(_dbs_info) \
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static struct cpu_dbs_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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/* Governor demand based switching data (per-policy or global). */
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struct dbs_data {
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int usage_count;
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void *tuners;
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unsigned int min_sampling_rate;
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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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struct kobject kobj;
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struct list_head policy_dbs_list;
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/*
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* Protect concurrent updates to governor tunables from sysfs,
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* policy_dbs_list and usage_count.
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*/
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struct mutex mutex;
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};
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/* Governor's specific attributes */
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struct dbs_data;
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struct governor_attr {
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struct attribute attr;
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ssize_t (*show)(struct dbs_data *dbs_data, char *buf);
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ssize_t (*store)(struct dbs_data *dbs_data, const char *buf,
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size_t count);
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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 dbs_data *dbs_data, char *buf) \
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{ \
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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 dbs_data *dbs_data, char *buf) \
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{ \
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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 timer_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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/* 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_cpu_wall;
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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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struct od_cpu_dbs_info_s {
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struct cpu_dbs_info cdbs;
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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_delay_us;
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unsigned int freq_hi_delay_us;
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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_info cdbs;
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unsigned int down_skip;
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unsigned int requested_freq;
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};
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/* Per policy Governors sysfs tunables */
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struct od_dbs_tuners {
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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 down_threshold;
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unsigned int freq_step;
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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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#define GOV_ONDEMAND 0
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#define GOV_CONSERVATIVE 1
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int governor;
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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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struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu);
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void *(*get_cpu_dbs_info_s)(int cpu);
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unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy);
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int (*init)(struct dbs_data *dbs_data, bool notify);
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void (*exit)(struct dbs_data *dbs_data, bool notify);
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/* Governor specific ops, see below */
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void *gov_ops;
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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 specific ops, will be passed to dbs_data->gov_ops */
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struct od_ops {
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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 *policy, unsigned int freq);
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};
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extern struct mutex dbs_data_mutex;
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unsigned int dbs_update(struct cpufreq_policy *policy);
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int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
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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 dbs_data *dbs_data, const char *buf,
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size_t count);
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#endif /* _CPUFREQ_GOVERNOR_H */
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