2012-10-22 17:28:05 -06:00
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/*
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* drivers/cpufreq/cpufreq_governor.c
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*
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* CPUFREQ governors common code
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*
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2012-10-25 16:47:42 -06:00
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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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2012-10-22 17:28:05 -06:00
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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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2012-10-25 16:47:42 -06:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2012-10-22 17:28:05 -06:00
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#include <linux/export.h>
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#include <linux/kernel_stat.h>
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2013-03-27 09:58:58 -06:00
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#include <linux/slab.h>
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2012-10-25 16:47:42 -06:00
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#include "cpufreq_governor.h"
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2013-03-27 09:58:58 -06:00
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static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data)
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{
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if (have_governor_per_policy())
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return dbs_data->cdata->attr_group_gov_pol;
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else
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return dbs_data->cdata->attr_group_gov_sys;
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}
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2012-10-25 16:47:42 -06:00
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void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
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{
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2013-03-27 09:58:58 -06:00
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struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
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2012-10-25 16:47:42 -06:00
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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struct cpufreq_policy *policy;
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unsigned int max_load = 0;
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unsigned int ignore_nice;
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unsigned int j;
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2013-03-27 09:58:58 -06:00
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if (dbs_data->cdata->governor == GOV_ONDEMAND)
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2013-08-05 00:58:02 -06:00
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ignore_nice = od_tuners->ignore_nice_load;
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2012-10-25 16:47:42 -06:00
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else
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2013-08-05 00:58:02 -06:00
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ignore_nice = cs_tuners->ignore_nice_load;
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2012-10-25 16:47:42 -06:00
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policy = cdbs->cur_policy;
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2013-06-05 10:01:25 -06:00
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/* Get Absolute Load */
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2012-10-25 16:47:42 -06:00
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for_each_cpu(j, policy->cpus) {
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struct cpu_dbs_common_info *j_cdbs;
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2013-02-28 09:57:32 -07:00
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u64 cur_wall_time, cur_idle_time;
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unsigned int idle_time, wall_time;
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2012-10-25 16:47:42 -06:00
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unsigned int load;
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2013-02-28 09:57:32 -07:00
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int io_busy = 0;
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2012-10-25 16:47:42 -06:00
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2013-03-27 09:58:58 -06:00
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j_cdbs = dbs_data->cdata->get_cpu_cdbs(j);
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2012-10-25 16:47:42 -06:00
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2013-02-28 09:57:32 -07:00
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/*
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* For the purpose of ondemand, waiting for disk IO is
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* an indication that you're performance critical, and
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* not that the system is actually idle. So do not add
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* the iowait time to the cpu idle time.
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*/
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if (dbs_data->cdata->governor == GOV_ONDEMAND)
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io_busy = od_tuners->io_is_busy;
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cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, io_busy);
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2012-10-25 16:47:42 -06:00
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wall_time = (unsigned int)
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(cur_wall_time - j_cdbs->prev_cpu_wall);
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j_cdbs->prev_cpu_wall = cur_wall_time;
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idle_time = (unsigned int)
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(cur_idle_time - j_cdbs->prev_cpu_idle);
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j_cdbs->prev_cpu_idle = cur_idle_time;
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if (ignore_nice) {
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u64 cur_nice;
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unsigned long cur_nice_jiffies;
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cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] -
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cdbs->prev_cpu_nice;
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/*
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* Assumption: nice time between sampling periods will
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* be less than 2^32 jiffies for 32 bit sys
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*/
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cur_nice_jiffies = (unsigned long)
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cputime64_to_jiffies64(cur_nice);
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cdbs->prev_cpu_nice =
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kcpustat_cpu(j).cpustat[CPUTIME_NICE];
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idle_time += jiffies_to_usecs(cur_nice_jiffies);
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}
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if (unlikely(!wall_time || wall_time < idle_time))
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continue;
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load = 100 * (wall_time - idle_time) / wall_time;
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if (load > max_load)
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max_load = load;
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}
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2013-03-27 09:58:58 -06:00
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dbs_data->cdata->gov_check_cpu(cpu, max_load);
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2012-10-25 16:47:42 -06:00
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}
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EXPORT_SYMBOL_GPL(dbs_check_cpu);
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2013-02-26 23:54:03 -07:00
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static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
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unsigned int delay)
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2012-10-25 16:47:42 -06:00
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{
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2013-03-27 09:58:58 -06:00
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struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
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2012-10-25 16:47:42 -06:00
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2013-02-26 23:54:03 -07:00
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mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
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2012-10-25 16:47:42 -06:00
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}
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2013-02-26 23:54:03 -07:00
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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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2012-10-25 16:47:42 -06:00
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{
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2013-02-26 23:54:03 -07:00
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int i;
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2013-08-27 12:47:29 -06:00
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if (!policy->governor_enabled)
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return;
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2013-02-26 23:54:03 -07:00
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if (!all_cpus) {
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2013-08-28 15:24:45 -06:00
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/*
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* Use raw_smp_processor_id() to avoid preemptible warnings.
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* We know that this is only called with all_cpus == false from
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* works that have been queued with *_work_on() functions and
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* those works are canceled during CPU_DOWN_PREPARE so they
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* can't possibly run on any other CPU.
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*/
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__gov_queue_work(raw_smp_processor_id(), dbs_data, delay);
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2013-02-26 23:54:03 -07:00
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} else {
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for_each_cpu(i, policy->cpus)
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__gov_queue_work(i, dbs_data, delay);
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}
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}
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EXPORT_SYMBOL_GPL(gov_queue_work);
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static inline void gov_cancel_work(struct dbs_data *dbs_data,
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struct cpufreq_policy *policy)
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{
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struct cpu_dbs_common_info *cdbs;
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int i;
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2013-01-30 06:53:37 -07:00
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2013-02-26 23:54:03 -07:00
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for_each_cpu(i, policy->cpus) {
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cdbs = dbs_data->cdata->get_cpu_cdbs(i);
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cancel_delayed_work_sync(&cdbs->work);
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}
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2012-10-25 16:47:42 -06:00
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}
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2013-01-31 10:28:02 -07:00
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/* Will return if we need to evaluate cpu load again or not */
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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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{
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if (policy_is_shared(cdbs->cur_policy)) {
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ktime_t time_now = ktime_get();
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s64 delta_us = ktime_us_delta(time_now, cdbs->time_stamp);
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/* Do nothing if we recently have sampled */
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if (delta_us < (s64)(sampling_rate / 2))
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return false;
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else
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cdbs->time_stamp = time_now;
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}
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return true;
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}
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EXPORT_SYMBOL_GPL(need_load_eval);
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2013-03-27 09:58:58 -06:00
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static void set_sampling_rate(struct dbs_data *dbs_data,
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unsigned int sampling_rate)
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{
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if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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cs_tuners->sampling_rate = sampling_rate;
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} else {
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struct od_dbs_tuners *od_tuners = dbs_data->tuners;
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od_tuners->sampling_rate = sampling_rate;
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}
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}
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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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2012-10-25 16:47:42 -06:00
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{
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2013-03-27 09:58:58 -06:00
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struct dbs_data *dbs_data;
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2012-10-25 16:47:42 -06:00
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struct od_cpu_dbs_info_s *od_dbs_info = NULL;
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struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
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2013-01-31 10:28:01 -07:00
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struct od_ops *od_ops = NULL;
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2013-03-27 09:58:58 -06:00
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struct od_dbs_tuners *od_tuners = NULL;
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struct cs_dbs_tuners *cs_tuners = NULL;
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2012-10-25 16:47:42 -06:00
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struct cpu_dbs_common_info *cpu_cdbs;
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2013-03-27 09:58:58 -06:00
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unsigned int sampling_rate, latency, ignore_nice, j, cpu = policy->cpu;
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2013-02-28 09:57:32 -07:00
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int io_busy = 0;
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2012-10-25 16:47:42 -06:00
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int rc;
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2013-03-27 09:58:58 -06:00
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if (have_governor_per_policy())
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dbs_data = policy->governor_data;
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else
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dbs_data = cdata->gdbs_data;
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WARN_ON(!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT));
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switch (event) {
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case CPUFREQ_GOV_POLICY_INIT:
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if (have_governor_per_policy()) {
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WARN_ON(dbs_data);
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} else if (dbs_data) {
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2013-04-30 08:32:17 -06:00
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dbs_data->usage_count++;
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2013-03-27 09:58:58 -06:00
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policy->governor_data = dbs_data;
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return 0;
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}
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dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL);
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if (!dbs_data) {
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pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
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return -ENOMEM;
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}
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dbs_data->cdata = cdata;
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2013-04-30 08:32:17 -06:00
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dbs_data->usage_count = 1;
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2013-03-27 09:58:58 -06:00
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rc = cdata->init(dbs_data);
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if (rc) {
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pr_err("%s: POLICY_INIT: init() failed\n", __func__);
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kfree(dbs_data);
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return rc;
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}
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2013-05-17 04:39:09 -06:00
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if (!have_governor_per_policy())
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WARN_ON(cpufreq_get_global_kobject());
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2013-03-27 09:58:58 -06:00
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rc = sysfs_create_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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if (rc) {
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cdata->exit(dbs_data);
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kfree(dbs_data);
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return rc;
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}
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policy->governor_data = dbs_data;
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2013-08-26 12:42:21 -06:00
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/* policy latency is in ns. Convert it to us first */
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2013-03-27 09:58:58 -06:00
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latency = policy->cpuinfo.transition_latency / 1000;
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if (latency == 0)
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latency = 1;
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/* Bring kernel and HW constraints together */
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dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate,
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MIN_LATENCY_MULTIPLIER * latency);
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set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate,
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latency * LATENCY_MULTIPLIER));
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2013-04-30 08:32:17 -06:00
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if ((cdata->governor == GOV_CONSERVATIVE) &&
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(!policy->governor->initialized)) {
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2013-03-27 09:58:58 -06:00
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struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
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cpufreq_register_notifier(cs_ops->notifier_block,
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CPUFREQ_TRANSITION_NOTIFIER);
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}
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if (!have_governor_per_policy())
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cdata->gdbs_data = dbs_data;
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return 0;
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case CPUFREQ_GOV_POLICY_EXIT:
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2013-04-30 08:32:17 -06:00
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if (!--dbs_data->usage_count) {
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2013-03-27 09:58:58 -06:00
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sysfs_remove_group(get_governor_parent_kobj(policy),
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get_sysfs_attr(dbs_data));
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2013-05-17 04:39:09 -06:00
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if (!have_governor_per_policy())
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cpufreq_put_global_kobject();
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2013-04-30 08:32:17 -06:00
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if ((dbs_data->cdata->governor == GOV_CONSERVATIVE) &&
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(policy->governor->initialized == 1)) {
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2013-03-27 09:58:58 -06:00
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struct cs_ops *cs_ops = dbs_data->cdata->gov_ops;
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cpufreq_unregister_notifier(cs_ops->notifier_block,
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CPUFREQ_TRANSITION_NOTIFIER);
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}
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cdata->exit(dbs_data);
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kfree(dbs_data);
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cdata->gdbs_data = NULL;
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}
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2012-10-25 16:47:42 -06:00
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2013-03-27 09:58:58 -06:00
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policy->governor_data = NULL;
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return 0;
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}
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cpu_cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
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if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
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cs_tuners = dbs_data->tuners;
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cs_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
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sampling_rate = cs_tuners->sampling_rate;
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2013-08-05 00:58:02 -06:00
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ignore_nice = cs_tuners->ignore_nice_load;
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2012-10-25 16:47:42 -06:00
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} else {
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2013-03-27 09:58:58 -06:00
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od_tuners = dbs_data->tuners;
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od_dbs_info = dbs_data->cdata->get_cpu_dbs_info_s(cpu);
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sampling_rate = od_tuners->sampling_rate;
|
2013-08-05 00:58:02 -06:00
|
|
|
ignore_nice = od_tuners->ignore_nice_load;
|
2013-03-27 09:58:58 -06:00
|
|
|
od_ops = dbs_data->cdata->gov_ops;
|
2013-02-28 09:57:32 -07:00
|
|
|
io_busy = od_tuners->io_is_busy;
|
2012-10-25 16:47:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
switch (event) {
|
|
|
|
case CPUFREQ_GOV_START:
|
2013-02-04 04:38:51 -07:00
|
|
|
if (!policy->cur)
|
2012-10-25 16:47:42 -06:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mutex_lock(&dbs_data->mutex);
|
|
|
|
|
|
|
|
for_each_cpu(j, policy->cpus) {
|
2013-01-31 10:28:01 -07:00
|
|
|
struct cpu_dbs_common_info *j_cdbs =
|
2013-03-27 09:58:58 -06:00
|
|
|
dbs_data->cdata->get_cpu_cdbs(j);
|
2012-10-25 16:47:42 -06:00
|
|
|
|
2013-01-31 03:39:19 -07:00
|
|
|
j_cdbs->cpu = j;
|
2012-10-25 16:47:42 -06:00
|
|
|
j_cdbs->cur_policy = policy;
|
|
|
|
j_cdbs->prev_cpu_idle = get_cpu_idle_time(j,
|
2013-02-28 09:57:32 -07:00
|
|
|
&j_cdbs->prev_cpu_wall, io_busy);
|
2012-10-25 16:47:42 -06:00
|
|
|
if (ignore_nice)
|
|
|
|
j_cdbs->prev_cpu_nice =
|
|
|
|
kcpustat_cpu(j).cpustat[CPUTIME_NICE];
|
2012-12-27 07:55:38 -07:00
|
|
|
|
|
|
|
mutex_init(&j_cdbs->timer_mutex);
|
|
|
|
INIT_DEFERRABLE_WORK(&j_cdbs->work,
|
2013-03-27 09:58:58 -06:00
|
|
|
dbs_data->cdata->gov_dbs_timer);
|
2012-10-25 16:47:42 -06:00
|
|
|
}
|
|
|
|
|
2013-03-27 09:58:58 -06:00
|
|
|
if (dbs_data->cdata->governor == GOV_CONSERVATIVE) {
|
2013-01-31 10:28:01 -07:00
|
|
|
cs_dbs_info->down_skip = 0;
|
|
|
|
cs_dbs_info->enable = 1;
|
|
|
|
cs_dbs_info->requested_freq = policy->cur;
|
2012-10-25 16:47:42 -06:00
|
|
|
} else {
|
2013-01-31 10:28:01 -07:00
|
|
|
od_dbs_info->rate_mult = 1;
|
|
|
|
od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
|
|
|
|
od_ops->powersave_bias_init_cpu(cpu);
|
2012-10-25 16:47:42 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&dbs_data->mutex);
|
|
|
|
|
2013-01-30 06:53:37 -07:00
|
|
|
/* Initiate timer time stamp */
|
|
|
|
cpu_cdbs->time_stamp = ktime_get();
|
2012-12-27 07:55:40 -07:00
|
|
|
|
2013-02-26 23:54:03 -07:00
|
|
|
gov_queue_work(dbs_data, policy,
|
|
|
|
delay_for_sampling_rate(sampling_rate), true);
|
2012-10-25 16:47:42 -06:00
|
|
|
break;
|
|
|
|
|
|
|
|
case CPUFREQ_GOV_STOP:
|
2013-03-27 09:58:58 -06:00
|
|
|
if (dbs_data->cdata->governor == GOV_CONSERVATIVE)
|
2012-10-25 16:47:42 -06:00
|
|
|
cs_dbs_info->enable = 0;
|
|
|
|
|
2013-02-26 23:54:03 -07:00
|
|
|
gov_cancel_work(dbs_data, policy);
|
2012-10-25 16:47:42 -06:00
|
|
|
|
|
|
|
mutex_lock(&dbs_data->mutex);
|
|
|
|
mutex_destroy(&cpu_cdbs->timer_mutex);
|
2013-06-27 14:02:12 -06:00
|
|
|
cpu_cdbs->cur_policy = NULL;
|
2013-01-31 10:28:01 -07:00
|
|
|
|
2012-10-25 16:47:42 -06:00
|
|
|
mutex_unlock(&dbs_data->mutex);
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
case CPUFREQ_GOV_LIMITS:
|
|
|
|
mutex_lock(&cpu_cdbs->timer_mutex);
|
|
|
|
if (policy->max < cpu_cdbs->cur_policy->cur)
|
|
|
|
__cpufreq_driver_target(cpu_cdbs->cur_policy,
|
|
|
|
policy->max, CPUFREQ_RELATION_H);
|
|
|
|
else if (policy->min > cpu_cdbs->cur_policy->cur)
|
|
|
|
__cpufreq_driver_target(cpu_cdbs->cur_policy,
|
|
|
|
policy->min, CPUFREQ_RELATION_L);
|
|
|
|
dbs_check_cpu(dbs_data, cpu);
|
|
|
|
mutex_unlock(&cpu_cdbs->timer_mutex);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(cpufreq_governor_dbs);
|