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1da177e4 LT |
1 | /* |
2 | * drivers/cpufreq/cpufreq_stats.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
0a829c5a | 5 | * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>. |
1da177e4 LT |
6 | * |
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 | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/sysdev.h> | |
14 | #include <linux/cpu.h> | |
15 | #include <linux/sysfs.h> | |
16 | #include <linux/cpufreq.h> | |
17 | #include <linux/jiffies.h> | |
18 | #include <linux/percpu.h> | |
19 | #include <linux/kobject.h> | |
20 | #include <linux/spinlock.h> | |
c32b6b8e | 21 | #include <linux/notifier.h> |
58f1df25 | 22 | #include <asm/cputime.h> |
1da177e4 LT |
23 | |
24 | static spinlock_t cpufreq_stats_lock; | |
25 | ||
0a829c5a | 26 | #define CPUFREQ_STATDEVICE_ATTR(_name, _mode, _show) \ |
1da177e4 | 27 | static struct freq_attr _attr_##_name = {\ |
7b595756 | 28 | .attr = {.name = __stringify(_name), .mode = _mode, }, \ |
1da177e4 LT |
29 | .show = _show,\ |
30 | }; | |
31 | ||
1da177e4 LT |
32 | struct cpufreq_stats { |
33 | unsigned int cpu; | |
34 | unsigned int total_trans; | |
58f1df25 | 35 | unsigned long long last_time; |
1da177e4 LT |
36 | unsigned int max_state; |
37 | unsigned int state_num; | |
38 | unsigned int last_index; | |
58f1df25 | 39 | cputime64_t *time_in_state; |
1da177e4 LT |
40 | unsigned int *freq_table; |
41 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
42 | unsigned int *trans_table; | |
43 | #endif | |
44 | }; | |
45 | ||
7a6aedfa | 46 | static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table); |
1da177e4 LT |
47 | |
48 | struct cpufreq_stats_attribute { | |
49 | struct attribute attr; | |
50 | ssize_t(*show) (struct cpufreq_stats *, char *); | |
51 | }; | |
52 | ||
0a829c5a | 53 | static int cpufreq_stats_update(unsigned int cpu) |
1da177e4 LT |
54 | { |
55 | struct cpufreq_stats *stat; | |
58f1df25 VP |
56 | unsigned long long cur_time; |
57 | ||
58 | cur_time = get_jiffies_64(); | |
1da177e4 | 59 | spin_lock(&cpufreq_stats_lock); |
7a6aedfa | 60 | stat = per_cpu(cpufreq_stats_table, cpu); |
1da177e4 | 61 | if (stat->time_in_state) |
58f1df25 VP |
62 | stat->time_in_state[stat->last_index] = |
63 | cputime64_add(stat->time_in_state[stat->last_index], | |
64 | cputime_sub(cur_time, stat->last_time)); | |
65 | stat->last_time = cur_time; | |
1da177e4 LT |
66 | spin_unlock(&cpufreq_stats_lock); |
67 | return 0; | |
68 | } | |
69 | ||
0a829c5a | 70 | static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 71 | { |
7a6aedfa | 72 | struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); |
511e9ee1 | 73 | if (!stat) |
1da177e4 LT |
74 | return 0; |
75 | return sprintf(buf, "%d\n", | |
7a6aedfa | 76 | per_cpu(cpufreq_stats_table, stat->cpu)->total_trans); |
1da177e4 LT |
77 | } |
78 | ||
0a829c5a | 79 | static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf) |
1da177e4 LT |
80 | { |
81 | ssize_t len = 0; | |
82 | int i; | |
7a6aedfa | 83 | struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); |
511e9ee1 | 84 | if (!stat) |
1da177e4 LT |
85 | return 0; |
86 | cpufreq_stats_update(stat->cpu); | |
87 | for (i = 0; i < stat->state_num; i++) { | |
32ee8c3e | 88 | len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i], |
0a829c5a DJ |
89 | (unsigned long long) |
90 | cputime64_to_clock_t(stat->time_in_state[i])); | |
1da177e4 LT |
91 | } |
92 | return len; | |
93 | } | |
94 | ||
95 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
0a829c5a | 96 | static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf) |
1da177e4 LT |
97 | { |
98 | ssize_t len = 0; | |
99 | int i, j; | |
100 | ||
7a6aedfa | 101 | struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); |
511e9ee1 | 102 | if (!stat) |
1da177e4 LT |
103 | return 0; |
104 | cpufreq_stats_update(stat->cpu); | |
58f1df25 VP |
105 | len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); |
106 | len += snprintf(buf + len, PAGE_SIZE - len, " : "); | |
107 | for (i = 0; i < stat->state_num; i++) { | |
108 | if (len >= PAGE_SIZE) | |
109 | break; | |
110 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", | |
111 | stat->freq_table[i]); | |
112 | } | |
113 | if (len >= PAGE_SIZE) | |
25aca347 | 114 | return PAGE_SIZE; |
58f1df25 VP |
115 | |
116 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
117 | ||
1da177e4 LT |
118 | for (i = 0; i < stat->state_num; i++) { |
119 | if (len >= PAGE_SIZE) | |
120 | break; | |
58f1df25 VP |
121 | |
122 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ", | |
1da177e4 LT |
123 | stat->freq_table[i]); |
124 | ||
125 | for (j = 0; j < stat->state_num; j++) { | |
126 | if (len >= PAGE_SIZE) | |
127 | break; | |
58f1df25 | 128 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", |
1da177e4 LT |
129 | stat->trans_table[i*stat->max_state+j]); |
130 | } | |
25aca347 CEB |
131 | if (len >= PAGE_SIZE) |
132 | break; | |
1da177e4 LT |
133 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); |
134 | } | |
25aca347 CEB |
135 | if (len >= PAGE_SIZE) |
136 | return PAGE_SIZE; | |
1da177e4 LT |
137 | return len; |
138 | } | |
0a829c5a | 139 | CPUFREQ_STATDEVICE_ATTR(trans_table, 0444, show_trans_table); |
1da177e4 LT |
140 | #endif |
141 | ||
0a829c5a DJ |
142 | CPUFREQ_STATDEVICE_ATTR(total_trans, 0444, show_total_trans); |
143 | CPUFREQ_STATDEVICE_ATTR(time_in_state, 0444, show_time_in_state); | |
1da177e4 LT |
144 | |
145 | static struct attribute *default_attrs[] = { | |
146 | &_attr_total_trans.attr, | |
147 | &_attr_time_in_state.attr, | |
148 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
149 | &_attr_trans_table.attr, | |
150 | #endif | |
151 | NULL | |
152 | }; | |
153 | static struct attribute_group stats_attr_group = { | |
154 | .attrs = default_attrs, | |
155 | .name = "stats" | |
156 | }; | |
157 | ||
0a829c5a | 158 | static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq) |
1da177e4 LT |
159 | { |
160 | int index; | |
161 | for (index = 0; index < stat->max_state; index++) | |
162 | if (stat->freq_table[index] == freq) | |
163 | return index; | |
164 | return -1; | |
165 | } | |
166 | ||
a3323473 | 167 | static void cpufreq_stats_free_table(unsigned int cpu) |
1da177e4 | 168 | { |
7a6aedfa | 169 | struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu); |
1da177e4 | 170 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
32ee8c3e | 171 | if (policy && policy->cpu == cpu) |
1da177e4 LT |
172 | sysfs_remove_group(&policy->kobj, &stats_attr_group); |
173 | if (stat) { | |
174 | kfree(stat->time_in_state); | |
175 | kfree(stat); | |
176 | } | |
7a6aedfa | 177 | per_cpu(cpufreq_stats_table, cpu) = NULL; |
1da177e4 LT |
178 | if (policy) |
179 | cpufreq_cpu_put(policy); | |
180 | } | |
181 | ||
0a829c5a | 182 | static int cpufreq_stats_create_table(struct cpufreq_policy *policy, |
1da177e4 LT |
183 | struct cpufreq_frequency_table *table) |
184 | { | |
185 | unsigned int i, j, count = 0, ret = 0; | |
186 | struct cpufreq_stats *stat; | |
187 | struct cpufreq_policy *data; | |
188 | unsigned int alloc_size; | |
189 | unsigned int cpu = policy->cpu; | |
7a6aedfa | 190 | if (per_cpu(cpufreq_stats_table, cpu)) |
1da177e4 | 191 | return -EBUSY; |
0a829c5a DJ |
192 | stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL); |
193 | if ((stat) == NULL) | |
1da177e4 | 194 | return -ENOMEM; |
1da177e4 LT |
195 | |
196 | data = cpufreq_cpu_get(cpu); | |
bc7b26fd DJ |
197 | if (data == NULL) { |
198 | ret = -EINVAL; | |
199 | goto error_get_fail; | |
200 | } | |
201 | ||
0a829c5a DJ |
202 | ret = sysfs_create_group(&data->kobj, &stats_attr_group); |
203 | if (ret) | |
1da177e4 LT |
204 | goto error_out; |
205 | ||
206 | stat->cpu = cpu; | |
7a6aedfa | 207 | per_cpu(cpufreq_stats_table, cpu) = stat; |
1da177e4 | 208 | |
0a829c5a | 209 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
1da177e4 LT |
210 | unsigned int freq = table[i].frequency; |
211 | if (freq == CPUFREQ_ENTRY_INVALID) | |
212 | continue; | |
213 | count++; | |
214 | } | |
215 | ||
58f1df25 | 216 | alloc_size = count * sizeof(int) + count * sizeof(cputime64_t); |
1da177e4 LT |
217 | |
218 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
219 | alloc_size += count * count * sizeof(int); | |
220 | #endif | |
221 | stat->max_state = count; | |
e98df50c | 222 | stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 LT |
223 | if (!stat->time_in_state) { |
224 | ret = -ENOMEM; | |
225 | goto error_out; | |
226 | } | |
1da177e4 LT |
227 | stat->freq_table = (unsigned int *)(stat->time_in_state + count); |
228 | ||
229 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
230 | stat->trans_table = stat->freq_table + count; | |
231 | #endif | |
232 | j = 0; | |
233 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
234 | unsigned int freq = table[i].frequency; | |
235 | if (freq == CPUFREQ_ENTRY_INVALID) | |
236 | continue; | |
237 | if (freq_table_get_index(stat, freq) == -1) | |
238 | stat->freq_table[j++] = freq; | |
239 | } | |
240 | stat->state_num = j; | |
241 | spin_lock(&cpufreq_stats_lock); | |
58f1df25 | 242 | stat->last_time = get_jiffies_64(); |
1da177e4 LT |
243 | stat->last_index = freq_table_get_index(stat, policy->cur); |
244 | spin_unlock(&cpufreq_stats_lock); | |
245 | cpufreq_cpu_put(data); | |
246 | return 0; | |
247 | error_out: | |
248 | cpufreq_cpu_put(data); | |
b7fb358c | 249 | error_get_fail: |
1da177e4 | 250 | kfree(stat); |
7a6aedfa | 251 | per_cpu(cpufreq_stats_table, cpu) = NULL; |
1da177e4 LT |
252 | return ret; |
253 | } | |
254 | ||
0a829c5a DJ |
255 | static int cpufreq_stat_notifier_policy(struct notifier_block *nb, |
256 | unsigned long val, void *data) | |
1da177e4 LT |
257 | { |
258 | int ret; | |
259 | struct cpufreq_policy *policy = data; | |
260 | struct cpufreq_frequency_table *table; | |
261 | unsigned int cpu = policy->cpu; | |
262 | if (val != CPUFREQ_NOTIFY) | |
263 | return 0; | |
264 | table = cpufreq_frequency_get_table(cpu); | |
265 | if (!table) | |
266 | return 0; | |
0a829c5a DJ |
267 | ret = cpufreq_stats_create_table(policy, table); |
268 | if (ret) | |
1da177e4 LT |
269 | return ret; |
270 | return 0; | |
271 | } | |
272 | ||
0a829c5a DJ |
273 | static int cpufreq_stat_notifier_trans(struct notifier_block *nb, |
274 | unsigned long val, void *data) | |
1da177e4 LT |
275 | { |
276 | struct cpufreq_freqs *freq = data; | |
277 | struct cpufreq_stats *stat; | |
278 | int old_index, new_index; | |
279 | ||
280 | if (val != CPUFREQ_POSTCHANGE) | |
281 | return 0; | |
282 | ||
7a6aedfa | 283 | stat = per_cpu(cpufreq_stats_table, freq->cpu); |
1da177e4 LT |
284 | if (!stat) |
285 | return 0; | |
8edc59d9 | 286 | |
6501faf8 | 287 | old_index = stat->last_index; |
1da177e4 LT |
288 | new_index = freq_table_get_index(stat, freq->new); |
289 | ||
290 | cpufreq_stats_update(freq->cpu); | |
291 | if (old_index == new_index) | |
292 | return 0; | |
293 | ||
8edc59d9 VP |
294 | if (old_index == -1 || new_index == -1) |
295 | return 0; | |
296 | ||
1da177e4 LT |
297 | spin_lock(&cpufreq_stats_lock); |
298 | stat->last_index = new_index; | |
299 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
300 | stat->trans_table[old_index * stat->max_state + new_index]++; | |
301 | #endif | |
302 | stat->total_trans++; | |
303 | spin_unlock(&cpufreq_stats_lock); | |
304 | return 0; | |
305 | } | |
306 | ||
55395ae7 SS |
307 | static int __cpuinit cpufreq_stat_cpu_callback(struct notifier_block *nfb, |
308 | unsigned long action, | |
309 | void *hcpu) | |
c32b6b8e AR |
310 | { |
311 | unsigned int cpu = (unsigned long)hcpu; | |
312 | ||
313 | switch (action) { | |
314 | case CPU_ONLINE: | |
8bb78442 | 315 | case CPU_ONLINE_FROZEN: |
c32b6b8e AR |
316 | cpufreq_update_policy(cpu); |
317 | break; | |
318 | case CPU_DEAD: | |
8bb78442 | 319 | case CPU_DEAD_FROZEN: |
c32b6b8e AR |
320 | cpufreq_stats_free_table(cpu); |
321 | break; | |
322 | } | |
323 | return NOTIFY_OK; | |
324 | } | |
325 | ||
f6ebef30 | 326 | static struct notifier_block cpufreq_stat_cpu_notifier __refdata = |
c32b6b8e AR |
327 | { |
328 | .notifier_call = cpufreq_stat_cpu_callback, | |
329 | }; | |
330 | ||
1da177e4 LT |
331 | static struct notifier_block notifier_policy_block = { |
332 | .notifier_call = cpufreq_stat_notifier_policy | |
333 | }; | |
334 | ||
335 | static struct notifier_block notifier_trans_block = { | |
336 | .notifier_call = cpufreq_stat_notifier_trans | |
337 | }; | |
338 | ||
0a829c5a | 339 | static int __init cpufreq_stats_init(void) |
1da177e4 LT |
340 | { |
341 | int ret; | |
342 | unsigned int cpu; | |
c32b6b8e | 343 | |
1da177e4 | 344 | spin_lock_init(&cpufreq_stats_lock); |
0a829c5a DJ |
345 | ret = cpufreq_register_notifier(¬ifier_policy_block, |
346 | CPUFREQ_POLICY_NOTIFIER); | |
347 | if (ret) | |
1da177e4 LT |
348 | return ret; |
349 | ||
0a829c5a DJ |
350 | ret = cpufreq_register_notifier(¬ifier_trans_block, |
351 | CPUFREQ_TRANSITION_NOTIFIER); | |
352 | if (ret) { | |
1da177e4 LT |
353 | cpufreq_unregister_notifier(¬ifier_policy_block, |
354 | CPUFREQ_POLICY_NOTIFIER); | |
355 | return ret; | |
356 | } | |
357 | ||
65edc68c | 358 | register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); |
c32b6b8e | 359 | for_each_online_cpu(cpu) { |
55395ae7 | 360 | cpufreq_update_policy(cpu); |
c32b6b8e | 361 | } |
1da177e4 LT |
362 | return 0; |
363 | } | |
0a829c5a | 364 | static void __exit cpufreq_stats_exit(void) |
1da177e4 LT |
365 | { |
366 | unsigned int cpu; | |
c32b6b8e | 367 | |
1da177e4 LT |
368 | cpufreq_unregister_notifier(¬ifier_policy_block, |
369 | CPUFREQ_POLICY_NOTIFIER); | |
370 | cpufreq_unregister_notifier(¬ifier_trans_block, | |
371 | CPUFREQ_TRANSITION_NOTIFIER); | |
65edc68c | 372 | unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); |
c32b6b8e | 373 | for_each_online_cpu(cpu) { |
55395ae7 | 374 | cpufreq_stats_free_table(cpu); |
c32b6b8e | 375 | } |
1da177e4 LT |
376 | } |
377 | ||
0a829c5a DJ |
378 | MODULE_AUTHOR("Zou Nan hai <nanhai.zou@intel.com>"); |
379 | MODULE_DESCRIPTION("'cpufreq_stats' - A driver to export cpufreq stats " | |
e08f5f5b | 380 | "through sysfs filesystem"); |
0a829c5a | 381 | MODULE_LICENSE("GPL"); |
1da177e4 LT |
382 | |
383 | module_init(cpufreq_stats_init); | |
384 | module_exit(cpufreq_stats_exit); |