* drivers/cpufreq/cpufreq_stats.c
*
* Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
- * (C) 2004 Zou Nan hai <nanhai.zou@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/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, }, \
+ .attr = {.name = __stringify(_name), .mode = _mode, }, \
.show = _show,\
};
#endif
};
-static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS];
+static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);
struct cpufreq_stats_attribute {
struct attribute attr;
cur_time = get_jiffies_64();
spin_lock(&cpufreq_stats_lock);
- stat = cpufreq_stats_table[cpu];
+ stat = per_cpu(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],
static ssize_t
show_total_trans(struct cpufreq_policy *policy, char *buf)
{
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
- if(!stat)
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
+ if (!stat)
return 0;
return sprintf(buf, "%d\n",
- cpufreq_stats_table[stat->cpu]->total_trans);
+ per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
}
static ssize_t
{
ssize_t len = 0;
int i;
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
- if(!stat)
+ struct cpufreq_stats *stat = per_cpu(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],
+ 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;
ssize_t len = 0;
int i, j;
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
- if(!stat)
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
+ if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
stat->freq_table[i]);
}
if (len >= PAGE_SIZE)
- return len;
+ return PAGE_SIZE;
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
len += snprintf(buf + len, PAGE_SIZE - len, "%9u ",
stat->trans_table[i*stat->max_state+j]);
}
+ if (len >= PAGE_SIZE)
+ break;
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
}
+ if (len >= PAGE_SIZE)
+ return PAGE_SIZE;
return len;
}
CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table);
return -1;
}
-static void
-cpufreq_stats_free_table (unsigned int cpu)
+static void cpufreq_stats_free_table(unsigned int cpu)
{
- struct cpufreq_stats *stat = cpufreq_stats_table[cpu];
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu);
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
- if (policy && policy->cpu == 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;
+ per_cpu(cpufreq_stats_table, cpu) = NULL;
if (policy)
cpufreq_cpu_put(policy);
}
struct cpufreq_policy *data;
unsigned int alloc_size;
unsigned int cpu = policy->cpu;
- if (cpufreq_stats_table[cpu])
+ if (per_cpu(cpufreq_stats_table, cpu))
return -EBUSY;
if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL)
return -ENOMEM;
goto error_out;
stat->cpu = cpu;
- cpufreq_stats_table[cpu] = stat;
+ per_cpu(cpufreq_stats_table, cpu) = stat;
for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
unsigned int freq = table[i].frequency;
cpufreq_cpu_put(data);
error_get_fail:
kfree(stat);
- cpufreq_stats_table[cpu] = NULL;
+ per_cpu(cpufreq_stats_table, cpu) = NULL;
return ret;
}
if (val != CPUFREQ_POSTCHANGE)
return 0;
- stat = cpufreq_stats_table[freq->cpu];
+ stat = per_cpu(cpufreq_stats_table, freq->cpu);
if (!stat)
return 0;
- old_index = freq_table_get_index(stat, freq->old);
+
+ old_index = stat->last_index;
new_index = freq_table_get_index(stat, freq->new);
cpufreq_stats_update(freq->cpu);
if (old_index == new_index)
return 0;
+ if (old_index == -1 || new_index == -1)
+ return 0;
+
spin_lock(&cpufreq_stats_lock);
stat->last_index = new_index;
#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
return 0;
}
+static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
+ unsigned long action,
+ void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ cpufreq_update_policy(cpu);
+ break;
+ case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
+ cpufreq_stats_free_table(cpu);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block cpufreq_stat_cpu_notifier __refdata =
+{
+ .notifier_call = cpufreq_stat_cpu_callback,
+};
+
static struct notifier_block notifier_policy_block = {
.notifier_call = cpufreq_stat_notifier_policy
};
{
int ret;
unsigned int cpu;
+
spin_lock_init(&cpufreq_stats_lock);
if ((ret = cpufreq_register_notifier(¬ifier_policy_block,
CPUFREQ_POLICY_NOTIFIER)))
return ret;
}
- for_each_cpu(cpu)
+ register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+ for_each_online_cpu(cpu) {
cpufreq_update_policy(cpu);
+ }
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_cpu(cpu)
+ unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
+ for_each_online_cpu(cpu) {
cpufreq_stats_free_table(cpu);
+ }
}
MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");
-MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats through sysfs filesystem");
+MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats "
+ "through sysfs filesystem");
MODULE_LICENSE ("GPL");
module_init(cpufreq_stats_init);