You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
385 lines
9.4 KiB
385 lines
9.4 KiB
/*
|
|
* drivers/cpufreq/cpufreq_stats.c
|
|
*
|
|
* Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
|
|
* (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sysdev.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/notifier.h>
|
|
#include <asm/cputime.h>
|
|
|
|
static spinlock_t cpufreq_stats_lock;
|
|
|
|
#define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \
|
|
static struct freq_attr _attr_##_name = {\
|
|
.attr = {.name = __stringify(_name), .owner = THIS_MODULE, \
|
|
.mode = _mode, }, \
|
|
.show = _show,\
|
|
};
|
|
|
|
struct cpufreq_stats {
|
|
unsigned int cpu;
|
|
unsigned int total_trans;
|
|
unsigned long long last_time;
|
|
unsigned int max_state;
|
|
unsigned int state_num;
|
|
unsigned int last_index;
|
|
cputime64_t *time_in_state;
|
|
unsigned int *freq_table;
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
unsigned int *trans_table;
|
|
#endif
|
|
};
|
|
|
|
static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS];
|
|
|
|
struct cpufreq_stats_attribute {
|
|
struct attribute attr;
|
|
ssize_t(*show) (struct cpufreq_stats *, char *);
|
|
};
|
|
|
|
static int
|
|
cpufreq_stats_update (unsigned int cpu)
|
|
{
|
|
struct cpufreq_stats *stat;
|
|
unsigned long long cur_time;
|
|
|
|
cur_time = get_jiffies_64();
|
|
spin_lock(&cpufreq_stats_lock);
|
|
stat = cpufreq_stats_table[cpu];
|
|
if (stat->time_in_state)
|
|
stat->time_in_state[stat->last_index] =
|
|
cputime64_add(stat->time_in_state[stat->last_index],
|
|
cputime_sub(cur_time, stat->last_time));
|
|
stat->last_time = cur_time;
|
|
spin_unlock(&cpufreq_stats_lock);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
show_total_trans(struct cpufreq_policy *policy, char *buf)
|
|
{
|
|
struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
|
|
if (!stat)
|
|
return 0;
|
|
return sprintf(buf, "%d\n",
|
|
cpufreq_stats_table[stat->cpu]->total_trans);
|
|
}
|
|
|
|
static ssize_t
|
|
show_time_in_state(struct cpufreq_policy *policy, char *buf)
|
|
{
|
|
ssize_t len = 0;
|
|
int i;
|
|
struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
|
|
if (!stat)
|
|
return 0;
|
|
cpufreq_stats_update(stat->cpu);
|
|
for (i = 0; i < stat->state_num; i++) {
|
|
len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
|
|
(unsigned long long)cputime64_to_clock_t(stat->time_in_state[i]));
|
|
}
|
|
return len;
|
|
}
|
|
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
static ssize_t
|
|
show_trans_table(struct cpufreq_policy *policy, char *buf)
|
|
{
|
|
ssize_t len = 0;
|
|
int i, j;
|
|
|
|
struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
|
|
if (!stat)
|
|
return 0;
|
|
cpufreq_stats_update(stat->cpu);
|
|
len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
|
|
len += snprintf(buf + len, PAGE_SIZE - len, " : ");
|
|
for (i = 0; i < stat->state_num; i++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
|
|
stat->freq_table[i]);
|
|
}
|
|
if (len >= PAGE_SIZE)
|
|
return len;
|
|
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
|
|
|
|
for (i = 0; i < stat->state_num; i++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ",
|
|
stat->freq_table[i]);
|
|
|
|
for (j = 0; j < stat->state_num; j++) {
|
|
if (len >= PAGE_SIZE)
|
|
break;
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
|
|
stat->trans_table[i*stat->max_state+j]);
|
|
}
|
|
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
|
|
}
|
|
return len;
|
|
}
|
|
CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table);
|
|
#endif
|
|
|
|
CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans);
|
|
CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state);
|
|
|
|
static struct attribute *default_attrs[] = {
|
|
&_attr_total_trans.attr,
|
|
&_attr_time_in_state.attr,
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
&_attr_trans_table.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
static struct attribute_group stats_attr_group = {
|
|
.attrs = default_attrs,
|
|
.name = "stats"
|
|
};
|
|
|
|
static int
|
|
freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
|
|
{
|
|
int index;
|
|
for (index = 0; index < stat->max_state; index++)
|
|
if (stat->freq_table[index] == freq)
|
|
return index;
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
cpufreq_stats_free_table (unsigned int cpu)
|
|
{
|
|
struct cpufreq_stats *stat = cpufreq_stats_table[cpu];
|
|
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
|
|
if (policy && policy->cpu == cpu)
|
|
sysfs_remove_group(&policy->kobj, &stats_attr_group);
|
|
if (stat) {
|
|
kfree(stat->time_in_state);
|
|
kfree(stat);
|
|
}
|
|
cpufreq_stats_table[cpu] = NULL;
|
|
if (policy)
|
|
cpufreq_cpu_put(policy);
|
|
}
|
|
|
|
static int
|
|
cpufreq_stats_create_table (struct cpufreq_policy *policy,
|
|
struct cpufreq_frequency_table *table)
|
|
{
|
|
unsigned int i, j, count = 0, ret = 0;
|
|
struct cpufreq_stats *stat;
|
|
struct cpufreq_policy *data;
|
|
unsigned int alloc_size;
|
|
unsigned int cpu = policy->cpu;
|
|
if (cpufreq_stats_table[cpu])
|
|
return -EBUSY;
|
|
if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL)
|
|
return -ENOMEM;
|
|
|
|
data = cpufreq_cpu_get(cpu);
|
|
if (data == NULL) {
|
|
ret = -EINVAL;
|
|
goto error_get_fail;
|
|
}
|
|
|
|
if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group)))
|
|
goto error_out;
|
|
|
|
stat->cpu = cpu;
|
|
cpufreq_stats_table[cpu] = stat;
|
|
|
|
for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
count++;
|
|
}
|
|
|
|
alloc_size = count * sizeof(int) + count * sizeof(cputime64_t);
|
|
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
alloc_size += count * count * sizeof(int);
|
|
#endif
|
|
stat->max_state = count;
|
|
stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
|
|
if (!stat->time_in_state) {
|
|
ret = -ENOMEM;
|
|
goto error_out;
|
|
}
|
|
stat->freq_table = (unsigned int *)(stat->time_in_state + count);
|
|
|
|
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
|
|
stat->trans_table = stat->freq_table + count;
|
|
#endif
|
|
j = 0;
|
|
for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
|
|
unsigned int freq = table[i].frequency;
|
|
if (freq == CPUFREQ_ENTRY_INVALID)
|
|
continue;
|
|
if (freq_table_get_index(stat, freq) == -1)
|
|
stat->freq_table[j++] = freq;
|
|
}
|
|
stat->state_num = j;
|
|
spin_lock(&cpufreq_stats_lock);
|
|
stat->last_time = get_jiffies_64();
|
|
stat->last_index = freq_table_get_index(stat, policy->cur);
|
|
spin_unlock(&cpufreq_stats_lock);
|
|
cpufreq_cpu_put(data);
|
|
return 0;
|
|
error_out:
|
|
cpufreq_cpu_put(data);
|
|
error_get_fail:
|
|
kfree(stat);
|
|
cpufreq_stats_table[cpu] = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
|
|
void *data)
|
|
{
|
|
int ret;
|
|
struct cpufreq_policy *policy = data;
|
|
struct cpufreq_frequency_table *table;
|
|
unsigned int cpu = policy->cpu;
|
|
if (val != CPUFREQ_NOTIFY)
|
|
return 0;
|
|
table = cpufreq_frequency_get_table(cpu);
|
|
if (!table)
|
|
return 0;
|
|
if ((ret = cpufreq_stats_create_table(policy, table)))
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
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 = cpufreq_stats_table[freq->cpu];
|
|
if (!stat)
|
|
return 0;
|
|
old_index = freq_table_get_index(stat, freq->old);
|
|
new_index = freq_table_get_index(stat, freq->new);
|
|
|
|
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 int cpufreq_stat_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
cpufreq_update_policy(cpu);
|
|
break;
|
|
case CPU_DEAD:
|
|
cpufreq_stats_free_table(cpu);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block cpufreq_stat_cpu_notifier =
|
|
{
|
|
.notifier_call = cpufreq_stat_cpu_callback,
|
|
};
|
|
|
|
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);
|
|
if ((ret = cpufreq_register_notifier(¬ifier_policy_block,
|
|
CPUFREQ_POLICY_NOTIFIER)))
|
|
return ret;
|
|
|
|
if ((ret = cpufreq_register_notifier(¬ifier_trans_block,
|
|
CPUFREQ_TRANSITION_NOTIFIER))) {
|
|
cpufreq_unregister_notifier(¬ifier_policy_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
return ret;
|
|
}
|
|
|
|
register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
|
|
lock_cpu_hotplug();
|
|
for_each_online_cpu(cpu) {
|
|
cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
|
|
(void *)(long)cpu);
|
|
}
|
|
unlock_cpu_hotplug();
|
|
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);
|
|
unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
|
|
lock_cpu_hotplug();
|
|
for_each_online_cpu(cpu) {
|
|
cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_DEAD,
|
|
(void *)(long)cpu);
|
|
}
|
|
unlock_cpu_hotplug();
|
|
}
|
|
|
|
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);
|
|
|