a97c98addd
There are two types of INIT/EXIT activities that we need to do for
governors:
- Done only once per governor (doesn't depend how many instances of
the governor there are). eg: cpufreq_register_notifier() for
conservative governor.
- Done per governor instance, eg: sysfs_{create|remove}_group().
There were some corner cases where current code isn't able to handle
them separately and so failing for some test cases.
We use two separate variables now for keeping track of above two
requirements.
- governor->initialized for first one
- dbs_data->usage_count for per governor instance
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
272 lines
8.1 KiB
C
272 lines
8.1 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/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 (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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/*
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* Macro for creating governors sysfs routines
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*
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* - gov_sys: One governor instance per whole system
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* - gov_pol: One governor instance per policy
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*/
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/* Create attributes */
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#define gov_sys_attr_ro(_name) \
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static struct global_attr _name##_gov_sys = \
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__ATTR(_name, 0444, show_##_name##_gov_sys, NULL)
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#define gov_sys_attr_rw(_name) \
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static struct global_attr _name##_gov_sys = \
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__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
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#define gov_pol_attr_ro(_name) \
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static struct freq_attr _name##_gov_pol = \
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__ATTR(_name, 0444, show_##_name##_gov_pol, NULL)
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#define gov_pol_attr_rw(_name) \
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static struct freq_attr _name##_gov_pol = \
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__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
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#define gov_sys_pol_attr_rw(_name) \
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gov_sys_attr_rw(_name); \
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gov_pol_attr_rw(_name)
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#define gov_sys_pol_attr_ro(_name) \
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gov_sys_attr_ro(_name); \
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gov_pol_attr_ro(_name)
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/* Create show/store routines */
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#define show_one(_gov, file_name) \
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static ssize_t show_##file_name##_gov_sys \
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(struct kobject *kobj, struct attribute *attr, char *buf) \
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{ \
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struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \
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return sprintf(buf, "%u\n", tuners->file_name); \
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} \
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\
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static ssize_t show_##file_name##_gov_pol \
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(struct cpufreq_policy *policy, char *buf) \
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{ \
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struct dbs_data *dbs_data = policy->governor_data; \
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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 store_one(_gov, file_name) \
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static ssize_t store_##file_name##_gov_sys \
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(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \
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{ \
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struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
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return store_##file_name(dbs_data, buf, count); \
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} \
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\
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static ssize_t store_##file_name##_gov_pol \
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(struct cpufreq_policy *policy, const char *buf, size_t count) \
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{ \
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struct dbs_data *dbs_data = policy->governor_data; \
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return store_##file_name(dbs_data, buf, count); \
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}
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#define show_store_one(_gov, file_name) \
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show_one(_gov, file_name); \
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store_one(_gov, file_name)
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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_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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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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/* Per policy 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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/* Common Governer data across policies */
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struct dbs_data;
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struct common_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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struct attribute_group *attr_group_gov_sys; /* one governor - system */
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struct attribute_group *attr_group_gov_pol; /* one governor - policy */
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/* Common data for platforms that don't set have_governor_per_policy */
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struct dbs_data *gdbs_data;
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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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int (*init)(struct dbs_data *dbs_data);
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void (*exit)(struct dbs_data *dbs_data);
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/* Governor specific ops, see below */
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void *gov_ops;
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};
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/* Governer Per policy data */
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struct dbs_data {
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struct common_dbs_data *cdata;
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unsigned int min_sampling_rate;
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int usage_count;
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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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};
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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 *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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#define declare_show_sampling_rate_min(_gov) \
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static ssize_t show_sampling_rate_min_gov_sys \
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(struct kobject *kobj, struct attribute *attr, char *buf) \
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{ \
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struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \
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return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
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} \
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\
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static ssize_t show_sampling_rate_min_gov_pol \
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(struct cpufreq_policy *policy, char *buf) \
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{ \
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struct dbs_data *dbs_data = policy->governor_data; \
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return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
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}
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u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
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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 cpufreq_policy *policy,
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struct common_dbs_data *cdata, unsigned int event);
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void gov_queue_work(struct dbs_data *dbs_data, struct cpufreq_policy *policy,
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unsigned int delay, bool all_cpus);
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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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#endif /* _CPUFREQ_GOVERNOR_H */
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