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path: root/drivers/cpufreq/cpufreq_stats.c
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Diffstat (limited to 'drivers/cpufreq/cpufreq_stats.c')
-rw-r--r--drivers/cpufreq/cpufreq_stats.c74
1 files changed, 35 insertions, 39 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index c0ff97d375d7..5a62d678dd19 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -2,7 +2,7 @@
2 * drivers/cpufreq/cpufreq_stats.c 2 * drivers/cpufreq/cpufreq_stats.c
3 * 3 *
4 * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. 4 * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
5 * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>. 5 * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>.
6 * 6 *
7 * This program is free software; you can redistribute it and/or modify 7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as 8 * it under the terms of the GNU General Public License version 2 as
@@ -23,7 +23,7 @@
23 23
24static spinlock_t cpufreq_stats_lock; 24static spinlock_t cpufreq_stats_lock;
25 25
26#define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \ 26#define CPUFREQ_STATDEVICE_ATTR(_name, _mode, _show) \
27static struct freq_attr _attr_##_name = {\ 27static struct freq_attr _attr_##_name = {\
28 .attr = {.name = __stringify(_name), .mode = _mode, }, \ 28 .attr = {.name = __stringify(_name), .mode = _mode, }, \
29 .show = _show,\ 29 .show = _show,\
@@ -50,8 +50,7 @@ struct cpufreq_stats_attribute {
50 ssize_t(*show) (struct cpufreq_stats *, char *); 50 ssize_t(*show) (struct cpufreq_stats *, char *);
51}; 51};
52 52
53static int 53static int cpufreq_stats_update(unsigned int cpu)
54cpufreq_stats_update (unsigned int cpu)
55{ 54{
56 struct cpufreq_stats *stat; 55 struct cpufreq_stats *stat;
57 unsigned long long cur_time; 56 unsigned long long cur_time;
@@ -68,8 +67,7 @@ cpufreq_stats_update (unsigned int cpu)
68 return 0; 67 return 0;
69} 68}
70 69
71static ssize_t 70static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
72show_total_trans(struct cpufreq_policy *policy, char *buf)
73{ 71{
74 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); 72 struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu);
75 if (!stat) 73 if (!stat)
@@ -78,8 +76,7 @@ show_total_trans(struct cpufreq_policy *policy, char *buf)
78 per_cpu(cpufreq_stats_table, stat->cpu)->total_trans); 76 per_cpu(cpufreq_stats_table, stat->cpu)->total_trans);
79} 77}
80 78
81static ssize_t 79static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
82show_time_in_state(struct cpufreq_policy *policy, char *buf)
83{ 80{
84 ssize_t len = 0; 81 ssize_t len = 0;
85 int i; 82 int i;
@@ -89,14 +86,14 @@ show_time_in_state(struct cpufreq_policy *policy, char *buf)
89 cpufreq_stats_update(stat->cpu); 86 cpufreq_stats_update(stat->cpu);
90 for (i = 0; i < stat->state_num; i++) { 87 for (i = 0; i < stat->state_num; i++) {
91 len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i], 88 len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i],
92 (unsigned long long)cputime64_to_clock_t(stat->time_in_state[i])); 89 (unsigned long long)
90 cputime64_to_clock_t(stat->time_in_state[i]));
93 } 91 }
94 return len; 92 return len;
95} 93}
96 94
97#ifdef CONFIG_CPU_FREQ_STAT_DETAILS 95#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
98static ssize_t 96static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
99show_trans_table(struct cpufreq_policy *policy, char *buf)
100{ 97{
101 ssize_t len = 0; 98 ssize_t len = 0;
102 int i, j; 99 int i, j;
@@ -139,11 +136,11 @@ show_trans_table(struct cpufreq_policy *policy, char *buf)
139 return PAGE_SIZE; 136 return PAGE_SIZE;
140 return len; 137 return len;
141} 138}
142CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table); 139CPUFREQ_STATDEVICE_ATTR(trans_table, 0444, show_trans_table);
143#endif 140#endif
144 141
145CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans); 142CPUFREQ_STATDEVICE_ATTR(total_trans, 0444, show_total_trans);
146CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state); 143CPUFREQ_STATDEVICE_ATTR(time_in_state, 0444, show_time_in_state);
147 144
148static struct attribute *default_attrs[] = { 145static struct attribute *default_attrs[] = {
149 &_attr_total_trans.attr, 146 &_attr_total_trans.attr,
@@ -158,8 +155,7 @@ static struct attribute_group stats_attr_group = {
158 .name = "stats" 155 .name = "stats"
159}; 156};
160 157
161static int 158static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
162freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)
163{ 159{
164 int index; 160 int index;
165 for (index = 0; index < stat->max_state; index++) 161 for (index = 0; index < stat->max_state; index++)
@@ -183,8 +179,7 @@ static void cpufreq_stats_free_table(unsigned int cpu)
183 cpufreq_cpu_put(policy); 179 cpufreq_cpu_put(policy);
184} 180}
185 181
186static int 182static int cpufreq_stats_create_table(struct cpufreq_policy *policy,
187cpufreq_stats_create_table (struct cpufreq_policy *policy,
188 struct cpufreq_frequency_table *table) 183 struct cpufreq_frequency_table *table)
189{ 184{
190 unsigned int i, j, count = 0, ret = 0; 185 unsigned int i, j, count = 0, ret = 0;
@@ -194,7 +189,8 @@ cpufreq_stats_create_table (struct cpufreq_policy *policy,
194 unsigned int cpu = policy->cpu; 189 unsigned int cpu = policy->cpu;
195 if (per_cpu(cpufreq_stats_table, cpu)) 190 if (per_cpu(cpufreq_stats_table, cpu))
196 return -EBUSY; 191 return -EBUSY;
197 if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL) 192 stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL);
193 if ((stat) == NULL)
198 return -ENOMEM; 194 return -ENOMEM;
199 195
200 data = cpufreq_cpu_get(cpu); 196 data = cpufreq_cpu_get(cpu);
@@ -203,13 +199,14 @@ cpufreq_stats_create_table (struct cpufreq_policy *policy,
203 goto error_get_fail; 199 goto error_get_fail;
204 } 200 }
205 201
206 if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group))) 202 ret = sysfs_create_group(&data->kobj, &stats_attr_group);
203 if (ret)
207 goto error_out; 204 goto error_out;
208 205
209 stat->cpu = cpu; 206 stat->cpu = cpu;
210 per_cpu(cpufreq_stats_table, cpu) = stat; 207 per_cpu(cpufreq_stats_table, cpu) = stat;
211 208
212 for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) { 209 for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
213 unsigned int freq = table[i].frequency; 210 unsigned int freq = table[i].frequency;
214 if (freq == CPUFREQ_ENTRY_INVALID) 211 if (freq == CPUFREQ_ENTRY_INVALID)
215 continue; 212 continue;
@@ -255,9 +252,8 @@ error_get_fail:
255 return ret; 252 return ret;
256} 253}
257 254
258static int 255static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
259cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val, 256 unsigned long val, void *data)
260 void *data)
261{ 257{
262 int ret; 258 int ret;
263 struct cpufreq_policy *policy = data; 259 struct cpufreq_policy *policy = data;
@@ -268,14 +264,14 @@ cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val,
268 table = cpufreq_frequency_get_table(cpu); 264 table = cpufreq_frequency_get_table(cpu);
269 if (!table) 265 if (!table)
270 return 0; 266 return 0;
271 if ((ret = cpufreq_stats_create_table(policy, table))) 267 ret = cpufreq_stats_create_table(policy, table);
268 if (ret)
272 return ret; 269 return ret;
273 return 0; 270 return 0;
274} 271}
275 272
276static int 273static int cpufreq_stat_notifier_trans(struct notifier_block *nb,
277cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val, 274 unsigned long val, void *data)
278 void *data)
279{ 275{
280 struct cpufreq_freqs *freq = data; 276 struct cpufreq_freqs *freq = data;
281 struct cpufreq_stats *stat; 277 struct cpufreq_stats *stat;
@@ -340,19 +336,20 @@ static struct notifier_block notifier_trans_block = {
340 .notifier_call = cpufreq_stat_notifier_trans 336 .notifier_call = cpufreq_stat_notifier_trans
341}; 337};
342 338
343static int 339static int __init cpufreq_stats_init(void)
344__init cpufreq_stats_init(void)
345{ 340{
346 int ret; 341 int ret;
347 unsigned int cpu; 342 unsigned int cpu;
348 343
349 spin_lock_init(&cpufreq_stats_lock); 344 spin_lock_init(&cpufreq_stats_lock);
350 if ((ret = cpufreq_register_notifier(&notifier_policy_block, 345 ret = cpufreq_register_notifier(&notifier_policy_block,
351 CPUFREQ_POLICY_NOTIFIER))) 346 CPUFREQ_POLICY_NOTIFIER);
347 if (ret)
352 return ret; 348 return ret;
353 349
354 if ((ret = cpufreq_register_notifier(&notifier_trans_block, 350 ret = cpufreq_register_notifier(&notifier_trans_block,
355 CPUFREQ_TRANSITION_NOTIFIER))) { 351 CPUFREQ_TRANSITION_NOTIFIER);
352 if (ret) {
356 cpufreq_unregister_notifier(&notifier_policy_block, 353 cpufreq_unregister_notifier(&notifier_policy_block,
357 CPUFREQ_POLICY_NOTIFIER); 354 CPUFREQ_POLICY_NOTIFIER);
358 return ret; 355 return ret;
@@ -364,8 +361,7 @@ __init cpufreq_stats_init(void)
364 } 361 }
365 return 0; 362 return 0;
366} 363}
367static void 364static void __exit cpufreq_stats_exit(void)
368__exit cpufreq_stats_exit(void)
369{ 365{
370 unsigned int cpu; 366 unsigned int cpu;
371 367
@@ -379,10 +375,10 @@ __exit cpufreq_stats_exit(void)
379 } 375 }
380} 376}
381 377
382MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>"); 378MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>");
383MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats " 379MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats "
384 "through sysfs filesystem"); 380 "through sysfs filesystem");
385MODULE_LICENSE ("GPL"); 381MODULE_LICENSE("GPL");
386 382
387module_init(cpufreq_stats_init); 383module_init(cpufreq_stats_init);
388module_exit(cpufreq_stats_exit); 384module_exit(cpufreq_stats_exit);