733 lines
18 KiB
C
733 lines
18 KiB
C
/*
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* drivers/cpufreq/cpufreq_stats.c
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*
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* Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
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* (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
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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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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include <linux/of.h>
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#include <linux/sched.h>
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#include <linux/cputime.h>
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static spinlock_t cpufreq_stats_lock;
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struct cpufreq_stats {
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unsigned int cpu;
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unsigned int total_trans;
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unsigned long long last_time;
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unsigned int max_state;
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unsigned int state_num;
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unsigned int last_index;
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u64 *time_in_state;
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unsigned int *freq_table;
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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unsigned int *trans_table;
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#endif
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};
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struct all_cpufreq_stats {
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unsigned int state_num;
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cputime64_t *time_in_state;
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unsigned int *freq_table;
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};
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struct cpufreq_power_stats {
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unsigned int state_num;
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unsigned int *curr;
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unsigned int *freq_table;
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};
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struct all_freq_table {
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unsigned int *freq_table;
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unsigned int table_size;
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};
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static struct all_freq_table *all_freq_table;
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static DEFINE_PER_CPU(struct all_cpufreq_stats *, all_cpufreq_stats);
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static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);
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static DEFINE_PER_CPU(struct cpufreq_power_stats *, cpufreq_power_stats);
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struct cpufreq_stats_attribute {
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struct attribute attr;
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ssize_t(*show) (struct cpufreq_stats *, char *);
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};
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static int cpufreq_stats_update(unsigned int cpu)
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{
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struct cpufreq_stats *stat;
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struct all_cpufreq_stats *all_stat;
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unsigned long long cur_time;
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cur_time = get_jiffies_64();
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spin_lock(&cpufreq_stats_lock);
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stat = per_cpu(cpufreq_stats_table, cpu);
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all_stat = per_cpu(all_cpufreq_stats, cpu);
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if (!stat) {
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spin_unlock(&cpufreq_stats_lock);
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return 0;
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}
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if (stat->time_in_state) {
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stat->time_in_state[stat->last_index] +=
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cur_time - stat->last_time;
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if (all_stat)
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all_stat->time_in_state[stat->last_index] +=
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cur_time - stat->last_time;
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}
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stat->last_time = cur_time;
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spin_unlock(&cpufreq_stats_lock);
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return 0;
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}
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static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
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{
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struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
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if (!stat)
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return 0;
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return sprintf(buf, "%d\n",
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per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
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}
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static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
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{
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ssize_t len = 0;
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int i;
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struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
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if (!stat)
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return 0;
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cpufreq_stats_update(stat->cpu);
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for (i = 0; i < stat->state_num; i++) {
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len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
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(unsigned long long)
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jiffies_64_to_clock_t(stat->time_in_state[i]));
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}
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return len;
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}
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static int get_index_all_cpufreq_stat(struct all_cpufreq_stats *all_stat,
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unsigned int freq)
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{
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int i;
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if (!all_stat)
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return -1;
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for (i = 0; i < all_stat->state_num; i++) {
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if (all_stat->freq_table[i] == freq)
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return i;
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}
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return -1;
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}
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void acct_update_power(struct task_struct *task, cputime_t cputime) {
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struct cpufreq_power_stats *powerstats;
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struct cpufreq_stats *stats;
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unsigned int cpu_num, curr;
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if (!task)
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return;
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cpu_num = task_cpu(task);
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powerstats = per_cpu(cpufreq_power_stats, cpu_num);
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stats = per_cpu(cpufreq_stats_table, cpu_num);
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if (!powerstats || !stats)
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return;
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curr = powerstats->curr[stats->last_index];
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if (task->cpu_power != ULLONG_MAX)
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task->cpu_power += curr * cputime_to_usecs(cputime);
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}
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EXPORT_SYMBOL_GPL(acct_update_power);
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static ssize_t show_current_in_state(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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ssize_t len = 0;
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unsigned int i, cpu;
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struct cpufreq_power_stats *powerstats;
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spin_lock(&cpufreq_stats_lock);
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for_each_possible_cpu(cpu) {
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powerstats = per_cpu(cpufreq_power_stats, cpu);
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if (!powerstats)
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continue;
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len += scnprintf(buf + len, PAGE_SIZE - len, "CPU%d:", cpu);
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for (i = 0; i < powerstats->state_num; i++)
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len += scnprintf(buf + len, PAGE_SIZE - len,
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"%d=%d ", powerstats->freq_table[i],
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powerstats->curr[i]);
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len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
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}
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spin_unlock(&cpufreq_stats_lock);
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return len;
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}
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static ssize_t show_all_time_in_state(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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ssize_t len = 0;
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unsigned int i, cpu, freq, index;
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struct all_cpufreq_stats *all_stat;
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struct cpufreq_policy *policy;
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len += scnprintf(buf + len, PAGE_SIZE - len, "freq\t\t");
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for_each_possible_cpu(cpu) {
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len += scnprintf(buf + len, PAGE_SIZE - len, "cpu%d\t\t", cpu);
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if (cpu_online(cpu))
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cpufreq_stats_update(cpu);
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}
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if (!all_freq_table)
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goto out;
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for (i = 0; i < all_freq_table->table_size; i++) {
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freq = all_freq_table->freq_table[i];
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len += scnprintf(buf + len, PAGE_SIZE - len, "\n%u\t\t", freq);
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for_each_possible_cpu(cpu) {
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policy = cpufreq_cpu_get(cpu);
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if (policy == NULL)
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continue;
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all_stat = per_cpu(all_cpufreq_stats, policy->cpu);
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index = get_index_all_cpufreq_stat(all_stat, freq);
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if (index != -1) {
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len += scnprintf(buf + len, PAGE_SIZE - len,
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"%llu\t\t", (unsigned long long)
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cputime64_to_clock_t(all_stat->time_in_state[index]));
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} else {
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len += scnprintf(buf + len, PAGE_SIZE - len,
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"N/A\t\t");
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}
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cpufreq_cpu_put(policy);
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}
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}
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out:
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len += scnprintf(buf + len, PAGE_SIZE - len, "\n");
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return len;
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}
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
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{
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ssize_t len = 0;
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int i, j;
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struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
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if (!stat)
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return 0;
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cpufreq_stats_update(stat->cpu);
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len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
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len += snprintf(buf + len, PAGE_SIZE - len, " : ");
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for (i = 0; i < stat->state_num; i++) {
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if (len >= PAGE_SIZE)
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break;
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len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
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stat->freq_table[i]);
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}
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if (len >= PAGE_SIZE)
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return PAGE_SIZE;
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len += snprintf(buf + len, PAGE_SIZE - len, "\n");
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for (i = 0; i < stat->state_num; i++) {
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if (len >= PAGE_SIZE)
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break;
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len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ",
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stat->freq_table[i]);
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for (j = 0; j < stat->state_num; j++) {
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if (len >= PAGE_SIZE)
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break;
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len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
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stat->trans_table[i*stat->max_state+j]);
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}
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if (len >= PAGE_SIZE)
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break;
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len += snprintf(buf + len, PAGE_SIZE - len, "\n");
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}
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if (len >= PAGE_SIZE)
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return PAGE_SIZE;
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return len;
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}
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cpufreq_freq_attr_ro(trans_table);
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#endif
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cpufreq_freq_attr_ro(total_trans);
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cpufreq_freq_attr_ro(time_in_state);
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static struct attribute *default_attrs[] = {
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&total_trans.attr,
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&time_in_state.attr,
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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&trans_table.attr,
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#endif
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NULL
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};
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static struct attribute_group stats_attr_group = {
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.attrs = default_attrs,
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.name = "stats"
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};
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static struct kobj_attribute _attr_all_time_in_state = __ATTR(all_time_in_state,
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0444, show_all_time_in_state, NULL);
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static struct kobj_attribute _attr_current_in_state = __ATTR(current_in_state,
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0444, show_current_in_state, NULL);
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static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
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{
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int index;
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for (index = 0; index < stat->max_state; index++)
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if (stat->freq_table[index] == freq)
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return index;
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return -1;
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}
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static void __cpufreq_stats_free_table(struct cpufreq_policy *policy)
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{
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struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
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if (!stat)
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return;
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pr_debug("%s: Free stat table\n", __func__);
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sysfs_remove_group(&policy->kobj, &stats_attr_group);
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kfree(stat->time_in_state);
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kfree(stat);
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per_cpu(cpufreq_stats_table, policy->cpu) = NULL;
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}
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static void cpufreq_stats_free_table(unsigned int cpu)
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{
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struct cpufreq_policy *policy;
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policy = cpufreq_cpu_get(cpu);
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if (!policy)
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return;
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if (cpufreq_frequency_get_table(policy->cpu))
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__cpufreq_stats_free_table(policy);
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cpufreq_cpu_put(policy);
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}
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static void cpufreq_allstats_free(void)
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{
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int cpu;
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struct all_cpufreq_stats *all_stat;
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sysfs_remove_file(cpufreq_global_kobject,
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&_attr_all_time_in_state.attr);
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for_each_possible_cpu(cpu) {
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all_stat = per_cpu(all_cpufreq_stats, cpu);
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if (!all_stat)
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continue;
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kfree(all_stat->time_in_state);
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kfree(all_stat);
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per_cpu(all_cpufreq_stats, cpu) = NULL;
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}
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if (all_freq_table) {
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kfree(all_freq_table->freq_table);
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kfree(all_freq_table);
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all_freq_table = NULL;
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}
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}
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static void cpufreq_powerstats_free(void)
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{
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int cpu;
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struct cpufreq_power_stats *powerstats;
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sysfs_remove_file(cpufreq_global_kobject, &_attr_current_in_state.attr);
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for_each_possible_cpu(cpu) {
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powerstats = per_cpu(cpufreq_power_stats, cpu);
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if (!powerstats)
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continue;
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kfree(powerstats->curr);
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kfree(powerstats);
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per_cpu(cpufreq_power_stats, cpu) = NULL;
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}
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}
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static int __cpufreq_stats_create_table(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table, int count)
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{
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unsigned int i, ret = 0;
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struct cpufreq_stats *stat;
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unsigned int alloc_size;
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unsigned int cpu = policy->cpu;
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struct cpufreq_frequency_table *pos;
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if (per_cpu(cpufreq_stats_table, cpu))
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return -EBUSY;
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stat = kzalloc(sizeof(*stat), GFP_KERNEL);
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if ((stat) == NULL)
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return -ENOMEM;
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ret = sysfs_create_group(&policy->kobj, &stats_attr_group);
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if (ret)
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goto error_out;
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stat->cpu = cpu;
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per_cpu(cpufreq_stats_table, cpu) = stat;
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alloc_size = count * sizeof(int) + count * sizeof(u64);
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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alloc_size += count * count * sizeof(int);
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#endif
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stat->max_state = count;
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stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
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if (!stat->time_in_state) {
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ret = -ENOMEM;
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goto error_alloc;
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}
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stat->freq_table = (unsigned int *)(stat->time_in_state + count);
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#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
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stat->trans_table = stat->freq_table + count;
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#endif
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i = 0;
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cpufreq_for_each_valid_entry(pos, table)
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if (freq_table_get_index(stat, pos->frequency) == -1)
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stat->freq_table[i++] = pos->frequency;
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stat->state_num = i;
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spin_lock(&cpufreq_stats_lock);
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stat->last_time = get_jiffies_64();
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stat->last_index = freq_table_get_index(stat, policy->cur);
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spin_unlock(&cpufreq_stats_lock);
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return 0;
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error_alloc:
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sysfs_remove_group(&policy->kobj, &stats_attr_group);
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error_out:
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kfree(stat);
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per_cpu(cpufreq_stats_table, cpu) = NULL;
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return ret;
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}
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static void cpufreq_stats_update_policy_cpu(struct cpufreq_policy *policy)
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{
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struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table,
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policy->last_cpu);
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pr_debug("Updating stats_table for new_cpu %u from last_cpu %u\n",
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policy->cpu, policy->last_cpu);
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per_cpu(cpufreq_stats_table, policy->cpu) = per_cpu(cpufreq_stats_table,
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policy->last_cpu);
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per_cpu(cpufreq_stats_table, policy->last_cpu) = NULL;
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stat->cpu = policy->cpu;
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}
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|
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static void cpufreq_powerstats_create(unsigned int cpu,
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struct cpufreq_frequency_table *table, int count) {
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unsigned int alloc_size, i = 0, ret = 0;
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struct cpufreq_power_stats *powerstats;
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struct cpufreq_frequency_table *pos;
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struct device_node *cpu_node;
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char device_path[16];
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|
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powerstats = kzalloc(sizeof(struct cpufreq_power_stats),
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GFP_KERNEL);
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if (!powerstats)
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return;
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|
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/* Allocate memory for freq table per cpu as well as clockticks per
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* freq*/
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alloc_size = count * sizeof(unsigned int) +
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count * sizeof(unsigned int);
|
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powerstats->curr = kzalloc(alloc_size, GFP_KERNEL);
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if (!powerstats->curr) {
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kfree(powerstats);
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return;
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}
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powerstats->freq_table = powerstats->curr + count;
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|
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spin_lock(&cpufreq_stats_lock);
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i = 0;
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cpufreq_for_each_valid_entry(pos, table)
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powerstats->freq_table[i++] = pos->frequency;
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powerstats->state_num = i;
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|
|
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snprintf(device_path, sizeof(device_path), "/cpus/cpu@%d", cpu);
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cpu_node = of_find_node_by_path(device_path);
|
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if (cpu_node) {
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ret = of_property_read_u32_array(cpu_node, "current",
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powerstats->curr, count);
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if (ret) {
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kfree(powerstats->curr);
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kfree(powerstats);
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powerstats = NULL;
|
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}
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}
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per_cpu(cpufreq_power_stats, cpu) = powerstats;
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spin_unlock(&cpufreq_stats_lock);
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}
|
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|
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static int compare_for_sort(const void *lhs_ptr, const void *rhs_ptr)
|
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{
|
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unsigned int lhs = *(const unsigned int *)(lhs_ptr);
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unsigned int rhs = *(const unsigned int *)(rhs_ptr);
|
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if (lhs < rhs)
|
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return -1;
|
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if (lhs > rhs)
|
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return 1;
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return 0;
|
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}
|
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|
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static bool check_all_freq_table(unsigned int freq)
|
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{
|
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int i;
|
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for (i = 0; i < all_freq_table->table_size; i++) {
|
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if (freq == all_freq_table->freq_table[i])
|
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return true;
|
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}
|
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return false;
|
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}
|
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|
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static void create_all_freq_table(void)
|
|
{
|
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all_freq_table = kzalloc(sizeof(struct all_freq_table),
|
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GFP_KERNEL);
|
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if (!all_freq_table)
|
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pr_warn("could not allocate memory for all_freq_table\n");
|
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return;
|
|
}
|
|
|
|
static void add_all_freq_table(unsigned int freq)
|
|
{
|
|
unsigned int size;
|
|
size = sizeof(unsigned int) * (all_freq_table->table_size + 1);
|
|
all_freq_table->freq_table = krealloc(all_freq_table->freq_table,
|
|
size, GFP_ATOMIC);
|
|
if (IS_ERR(all_freq_table->freq_table)) {
|
|
pr_warn("Could not reallocate memory for freq_table\n");
|
|
all_freq_table->freq_table = NULL;
|
|
return;
|
|
}
|
|
all_freq_table->freq_table[all_freq_table->table_size++] = freq;
|
|
}
|
|
|
|
static void cpufreq_allstats_create(unsigned int cpu,
|
|
struct cpufreq_frequency_table *table, int count)
|
|
{
|
|
int i , j = 0;
|
|
unsigned int alloc_size;
|
|
struct all_cpufreq_stats *all_stat;
|
|
bool sort_needed = false;
|
|
|
|
all_stat = kzalloc(sizeof(struct all_cpufreq_stats),
|
|
GFP_KERNEL);
|
|
if (!all_stat) {
|
|
pr_warn("Cannot allocate memory for cpufreq stats\n");
|
|
return;
|
|
}
|
|
|
|
/*Allocate memory for freq table per cpu as well as clockticks per freq*/
|
|
alloc_size = count * sizeof(int) + count * sizeof(cputime64_t);
|
|
all_stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
|
|
if (!all_stat->time_in_state) {
|
|
pr_warn("Cannot allocate memory for cpufreq time_in_state\n");
|
|
kfree(all_stat);
|
|
all_stat = NULL;
|
|
return;
|
|
}
|
|
all_stat->freq_table = (unsigned int *)
|
|
(all_stat->time_in_state + count);
|
|
|
|
spin_lock(&cpufreq_stats_lock);
|
|
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
all_stat->freq_table[j++] = freq;
|
|
if (all_freq_table && !check_all_freq_table(freq)) {
|
|
add_all_freq_table(freq);
|
|
sort_needed = true;
|
|
}
|
|
}
|
|
if (sort_needed)
|
|
sort(all_freq_table->freq_table, all_freq_table->table_size,
|
|
sizeof(unsigned int), &compare_for_sort, NULL);
|
|
all_stat->state_num = j;
|
|
per_cpu(all_cpufreq_stats, cpu) = all_stat;
|
|
spin_unlock(&cpufreq_stats_lock);
|
|
}
|
|
|
|
static void cpufreq_stats_create_table(unsigned int cpu)
|
|
{
|
|
struct cpufreq_policy *policy;
|
|
struct cpufreq_frequency_table *table, *pos;
|
|
int count = 0;
|
|
/*
|
|
* "likely(!policy)" because normally cpufreq_stats will be registered
|
|
* before cpufreq driver
|
|
*/
|
|
policy = cpufreq_cpu_get(cpu);
|
|
if (likely(!policy))
|
|
return;
|
|
|
|
table = cpufreq_frequency_get_table(policy->cpu);
|
|
if (likely(table)) {
|
|
cpufreq_for_each_valid_entry(pos, table)
|
|
count++;
|
|
|
|
if (!per_cpu(all_cpufreq_stats, cpu))
|
|
cpufreq_allstats_create(cpu, table, count);
|
|
|
|
if (!per_cpu(cpufreq_power_stats, cpu))
|
|
cpufreq_powerstats_create(cpu, table, count);
|
|
|
|
__cpufreq_stats_create_table(policy, table, count);
|
|
}
|
|
cpufreq_cpu_put(policy);
|
|
}
|
|
|
|
static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
|
|
unsigned long val, void *data)
|
|
{
|
|
int ret = 0, count = 0;
|
|
struct cpufreq_policy *policy = data;
|
|
struct cpufreq_frequency_table *table, *pos;
|
|
unsigned int cpu_num, cpu = policy->cpu;
|
|
|
|
if (val == CPUFREQ_UPDATE_POLICY_CPU) {
|
|
cpufreq_stats_update_policy_cpu(policy);
|
|
return 0;
|
|
}
|
|
|
|
table = cpufreq_frequency_get_table(cpu);
|
|
if (!table)
|
|
return 0;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table)
|
|
count++;
|
|
|
|
if (!per_cpu(all_cpufreq_stats, cpu))
|
|
cpufreq_allstats_create(cpu, table, count);
|
|
|
|
for_each_possible_cpu(cpu_num) {
|
|
if (!per_cpu(cpufreq_power_stats, cpu_num))
|
|
cpufreq_powerstats_create(cpu_num, table, count);
|
|
}
|
|
|
|
if (val == CPUFREQ_CREATE_POLICY)
|
|
ret = __cpufreq_stats_create_table(policy, table, count);
|
|
else if (val == CPUFREQ_REMOVE_POLICY)
|
|
__cpufreq_stats_free_table(policy);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
|
|
unsigned long val, void *data)
|
|
{
|
|
struct cpufreq_freqs *freq = data;
|
|
struct cpufreq_stats *stat;
|
|
int old_index, new_index;
|
|
|
|
if (val != CPUFREQ_POSTCHANGE)
|
|
return 0;
|
|
|
|
stat = per_cpu(cpufreq_stats_table, freq->cpu);
|
|
if (!stat)
|
|
return 0;
|
|
|
|
old_index = stat->last_index;
|
|
new_index = freq_table_get_index(stat, freq->new);
|
|
|
|
/* We can't do stat->time_in_state[-1]= .. */
|
|
if (old_index == -1 || new_index == -1)
|
|
return 0;
|
|
|
|
cpufreq_stats_update(freq->cpu);
|
|
|
|
if (old_index == new_index)
|
|
return 0;
|
|
|
|
spin_lock(&cpufreq_stats_lock);
|
|
stat->last_index = new_index;
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
stat->trans_table[old_index * stat->max_state + new_index]++;
|
|
#endif
|
|
stat->total_trans++;
|
|
spin_unlock(&cpufreq_stats_lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block notifier_policy_block = {
|
|
.notifier_call = cpufreq_stat_notifier_policy
|
|
};
|
|
|
|
static struct notifier_block notifier_trans_block = {
|
|
.notifier_call = cpufreq_stat_notifier_trans
|
|
};
|
|
|
|
static int __init cpufreq_stats_init(void)
|
|
{
|
|
int ret;
|
|
unsigned int cpu;
|
|
|
|
spin_lock_init(&cpufreq_stats_lock);
|
|
ret = cpufreq_register_notifier(¬ifier_policy_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for_each_online_cpu(cpu)
|
|
cpufreq_stats_create_table(cpu);
|
|
|
|
ret = cpufreq_register_notifier(¬ifier_trans_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
if (ret) {
|
|
cpufreq_unregister_notifier(¬ifier_policy_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
for_each_online_cpu(cpu)
|
|
cpufreq_stats_free_table(cpu);
|
|
return ret;
|
|
}
|
|
|
|
create_all_freq_table();
|
|
WARN_ON(cpufreq_get_global_kobject());
|
|
ret = sysfs_create_file(cpufreq_global_kobject,
|
|
&_attr_all_time_in_state.attr);
|
|
if (ret)
|
|
pr_warn("Cannot create sysfs file for cpufreq stats\n");
|
|
|
|
ret = sysfs_create_file(cpufreq_global_kobject,
|
|
&_attr_current_in_state.attr);
|
|
if (ret)
|
|
pr_warn("Cannot create sysfs file for cpufreq current stats\n");
|
|
|
|
return 0;
|
|
}
|
|
static void __exit cpufreq_stats_exit(void)
|
|
{
|
|
unsigned int cpu;
|
|
|
|
cpufreq_unregister_notifier(¬ifier_policy_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
cpufreq_unregister_notifier(¬ifier_trans_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
for_each_online_cpu(cpu)
|
|
cpufreq_stats_free_table(cpu);
|
|
cpufreq_allstats_free();
|
|
cpufreq_powerstats_free();
|
|
cpufreq_put_global_kobject();
|
|
}
|
|
|
|
MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>");
|
|
MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats "
|
|
"through sysfs filesystem");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(cpufreq_stats_init);
|
|
module_exit(cpufreq_stats_exit);
|