* 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
static spinlock_t cpufreq_stats_lock;
-#define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \
+#define CPUFREQ_STATDEVICE_ATTR(_name, _mode, _show) \
static struct freq_attr _attr_##_name = {\
.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;
ssize_t(*show) (struct cpufreq_stats *, char *);
};
-static int
-cpufreq_stats_update (unsigned int cpu)
+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];
+ 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],
return 0;
}
-static ssize_t
-show_total_trans(struct cpufreq_policy *policy, char *buf)
+static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
{
- struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
+ 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
-show_time_in_state(struct cpufreq_policy *policy, char *buf)
+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];
+ 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],
- (unsigned long long)cputime64_to_clock_t(stat->time_in_state[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)
+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];
+ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
if (!stat)
return 0;
cpufreq_stats_update(stat->cpu);
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);
+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);
+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,
.name = "stats"
};
-static int
-freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
+static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
{
int index;
for (index = 0; index < stat->max_state; index++)
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)
sysfs_remove_group(&policy->kobj, &stats_attr_group);
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);
}
-static int
-cpufreq_stats_create_table (struct cpufreq_policy *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_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)
+ stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL);
+ if ((stat) == NULL)
return -ENOMEM;
data = cpufreq_cpu_get(cpu);
goto error_get_fail;
}
- if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group)))
+ ret = sysfs_create_group(&data->kobj, &stats_attr_group);
+ if (ret)
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++) {
+ for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
unsigned int freq = table[i].frequency;
if (freq == CPUFREQ_ENTRY_INVALID)
continue;
cpufreq_cpu_put(data);
error_get_fail:
kfree(stat);
- cpufreq_stats_table[cpu] = NULL;
+ per_cpu(cpufreq_stats_table, cpu) = NULL;
return ret;
}
-static int
-cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
- void *data)
+static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
+ unsigned long val, void *data)
{
int ret;
struct cpufreq_policy *policy = data;
table = cpufreq_frequency_get_table(cpu);
if (!table)
return 0;
- if ((ret = cpufreq_stats_create_table(policy, table)))
+ ret = cpufreq_stats_create_table(policy, table);
+ if (ret)
return ret;
return 0;
}
-static int
-cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
- void *data)
+static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
+ unsigned long val, void *data)
{
struct cpufreq_freqs *freq = data;
struct cpufreq_stats *stat;
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);
return 0;
}
-static int cpufreq_stat_cpu_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
+static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb,
+ unsigned long action,
+ void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
return NOTIFY_OK;
}
-static struct notifier_block cpufreq_stat_cpu_notifier =
+static struct notifier_block cpufreq_stat_cpu_notifier __refdata =
{
.notifier_call = cpufreq_stat_cpu_callback,
};
.notifier_call = cpufreq_stat_notifier_trans
};
-static int
-__init cpufreq_stats_init(void)
+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)))
+ ret = cpufreq_register_notifier(¬ifier_policy_block,
+ CPUFREQ_POLICY_NOTIFIER);
+ if (ret)
return ret;
- if ((ret = cpufreq_register_notifier(¬ifier_trans_block,
- CPUFREQ_TRANSITION_NOTIFIER))) {
+ ret = cpufreq_register_notifier(¬ifier_trans_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ if (ret) {
cpufreq_unregister_notifier(¬ifier_policy_block,
CPUFREQ_POLICY_NOTIFIER);
return ret;
register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
for_each_online_cpu(cpu) {
- cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier,
- CPU_ONLINE, (void *)(long)cpu);
+ cpufreq_update_policy(cpu);
}
return 0;
}
-static void
-__exit cpufreq_stats_exit(void)
+static void __exit cpufreq_stats_exit(void)
{
unsigned int cpu;
CPUFREQ_TRANSITION_NOTIFIER);
unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
for_each_online_cpu(cpu) {
- cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier,
- CPU_DEAD, (void *)(long)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"
+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_LICENSE("GPL");
module_init(cpufreq_stats_init);
module_exit(cpufreq_stats_exit);