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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>. | |
32ee8c3e | 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 | ||
26 | #define CPUFREQ_STATDEVICE_ATTR(_name,_mode,_show) \ | |
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 | ||
46 | static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS]; | |
47 | ||
48 | struct cpufreq_stats_attribute { | |
49 | struct attribute attr; | |
50 | ssize_t(*show) (struct cpufreq_stats *, char *); | |
51 | }; | |
52 | ||
53 | static int | |
54 | cpufreq_stats_update (unsigned int cpu) | |
55 | { | |
56 | struct cpufreq_stats *stat; | |
58f1df25 VP |
57 | unsigned long long cur_time; |
58 | ||
59 | cur_time = get_jiffies_64(); | |
1da177e4 LT |
60 | spin_lock(&cpufreq_stats_lock); |
61 | stat = cpufreq_stats_table[cpu]; | |
62 | if (stat->time_in_state) | |
58f1df25 VP |
63 | stat->time_in_state[stat->last_index] = |
64 | cputime64_add(stat->time_in_state[stat->last_index], | |
65 | cputime_sub(cur_time, stat->last_time)); | |
66 | stat->last_time = cur_time; | |
1da177e4 LT |
67 | spin_unlock(&cpufreq_stats_lock); |
68 | return 0; | |
69 | } | |
70 | ||
71 | static ssize_t | |
72 | show_total_trans(struct cpufreq_policy *policy, char *buf) | |
73 | { | |
74 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
511e9ee1 | 75 | if (!stat) |
1da177e4 LT |
76 | return 0; |
77 | return sprintf(buf, "%d\n", | |
78 | cpufreq_stats_table[stat->cpu]->total_trans); | |
79 | } | |
80 | ||
81 | static ssize_t | |
82 | show_time_in_state(struct cpufreq_policy *policy, char *buf) | |
83 | { | |
84 | ssize_t len = 0; | |
85 | int i; | |
86 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
511e9ee1 | 87 | if (!stat) |
1da177e4 LT |
88 | return 0; |
89 | cpufreq_stats_update(stat->cpu); | |
90 | for (i = 0; i < stat->state_num; i++) { | |
32ee8c3e | 91 | len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i], |
58f1df25 | 92 | (unsigned long long)cputime64_to_clock_t(stat->time_in_state[i])); |
1da177e4 LT |
93 | } |
94 | return len; | |
95 | } | |
96 | ||
97 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
98 | static ssize_t | |
99 | show_trans_table(struct cpufreq_policy *policy, char *buf) | |
100 | { | |
101 | ssize_t len = 0; | |
102 | int i, j; | |
103 | ||
104 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
511e9ee1 | 105 | if (!stat) |
1da177e4 LT |
106 | return 0; |
107 | cpufreq_stats_update(stat->cpu); | |
58f1df25 VP |
108 | len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); |
109 | len += snprintf(buf + len, PAGE_SIZE - len, " : "); | |
110 | for (i = 0; i < stat->state_num; i++) { | |
111 | if (len >= PAGE_SIZE) | |
112 | break; | |
113 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", | |
114 | stat->freq_table[i]); | |
115 | } | |
116 | if (len >= PAGE_SIZE) | |
117 | return len; | |
118 | ||
119 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
120 | ||
1da177e4 LT |
121 | for (i = 0; i < stat->state_num; i++) { |
122 | if (len >= PAGE_SIZE) | |
123 | break; | |
58f1df25 VP |
124 | |
125 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ", | |
1da177e4 LT |
126 | stat->freq_table[i]); |
127 | ||
128 | for (j = 0; j < stat->state_num; j++) { | |
129 | if (len >= PAGE_SIZE) | |
130 | break; | |
58f1df25 | 131 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", |
1da177e4 LT |
132 | stat->trans_table[i*stat->max_state+j]); |
133 | } | |
134 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
135 | } | |
136 | return len; | |
137 | } | |
138 | CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table); | |
139 | #endif | |
140 | ||
141 | CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans); | |
142 | CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state); | |
143 | ||
144 | static struct attribute *default_attrs[] = { | |
145 | &_attr_total_trans.attr, | |
146 | &_attr_time_in_state.attr, | |
147 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
148 | &_attr_trans_table.attr, | |
149 | #endif | |
150 | NULL | |
151 | }; | |
152 | static struct attribute_group stats_attr_group = { | |
153 | .attrs = default_attrs, | |
154 | .name = "stats" | |
155 | }; | |
156 | ||
157 | static int | |
158 | freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq) | |
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 | ||
55395ae7 | 167 | static void __cpuexit cpufreq_stats_free_table(unsigned int cpu) |
1da177e4 LT |
168 | { |
169 | struct cpufreq_stats *stat = cpufreq_stats_table[cpu]; | |
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 | } | |
177 | cpufreq_stats_table[cpu] = NULL; | |
178 | if (policy) | |
179 | cpufreq_cpu_put(policy); | |
180 | } | |
181 | ||
182 | static int | |
183 | cpufreq_stats_create_table (struct cpufreq_policy *policy, | |
184 | struct cpufreq_frequency_table *table) | |
185 | { | |
186 | unsigned int i, j, count = 0, ret = 0; | |
187 | struct cpufreq_stats *stat; | |
188 | struct cpufreq_policy *data; | |
189 | unsigned int alloc_size; | |
190 | unsigned int cpu = policy->cpu; | |
191 | if (cpufreq_stats_table[cpu]) | |
192 | return -EBUSY; | |
e98df50c | 193 | if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == 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 | ||
1da177e4 LT |
202 | if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group))) |
203 | goto error_out; | |
204 | ||
205 | stat->cpu = cpu; | |
206 | cpufreq_stats_table[cpu] = stat; | |
207 | ||
208 | for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
209 | unsigned int freq = table[i].frequency; | |
210 | if (freq == CPUFREQ_ENTRY_INVALID) | |
211 | continue; | |
212 | count++; | |
213 | } | |
214 | ||
58f1df25 | 215 | alloc_size = count * sizeof(int) + count * sizeof(cputime64_t); |
1da177e4 LT |
216 | |
217 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
218 | alloc_size += count * count * sizeof(int); | |
219 | #endif | |
220 | stat->max_state = count; | |
e98df50c | 221 | stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 LT |
222 | if (!stat->time_in_state) { |
223 | ret = -ENOMEM; | |
224 | goto error_out; | |
225 | } | |
1da177e4 LT |
226 | stat->freq_table = (unsigned int *)(stat->time_in_state + count); |
227 | ||
228 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
229 | stat->trans_table = stat->freq_table + count; | |
230 | #endif | |
231 | j = 0; | |
232 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
233 | unsigned int freq = table[i].frequency; | |
234 | if (freq == CPUFREQ_ENTRY_INVALID) | |
235 | continue; | |
236 | if (freq_table_get_index(stat, freq) == -1) | |
237 | stat->freq_table[j++] = freq; | |
238 | } | |
239 | stat->state_num = j; | |
240 | spin_lock(&cpufreq_stats_lock); | |
58f1df25 | 241 | stat->last_time = get_jiffies_64(); |
1da177e4 LT |
242 | stat->last_index = freq_table_get_index(stat, policy->cur); |
243 | spin_unlock(&cpufreq_stats_lock); | |
244 | cpufreq_cpu_put(data); | |
245 | return 0; | |
246 | error_out: | |
247 | cpufreq_cpu_put(data); | |
b7fb358c | 248 | error_get_fail: |
1da177e4 LT |
249 | kfree(stat); |
250 | cpufreq_stats_table[cpu] = NULL; | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static int | |
255 | cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val, | |
256 | void *data) | |
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; | |
267 | if ((ret = cpufreq_stats_create_table(policy, table))) | |
268 | return ret; | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int | |
273 | cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val, | |
274 | void *data) | |
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 | ||
283 | stat = cpufreq_stats_table[freq->cpu]; | |
284 | if (!stat) | |
285 | return 0; | |
8edc59d9 | 286 | |
1da177e4 LT |
287 | old_index = freq_table_get_index(stat, freq->old); |
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 | ||
55395ae7 | 326 | static struct notifier_block cpufreq_stat_cpu_notifier __cpuinitdata = |
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 | ||
339 | static int | |
340 | __init cpufreq_stats_init(void) | |
341 | { | |
342 | int ret; | |
343 | unsigned int cpu; | |
c32b6b8e | 344 | |
1da177e4 LT |
345 | spin_lock_init(&cpufreq_stats_lock); |
346 | if ((ret = cpufreq_register_notifier(¬ifier_policy_block, | |
347 | CPUFREQ_POLICY_NOTIFIER))) | |
348 | return ret; | |
349 | ||
350 | if ((ret = cpufreq_register_notifier(¬ifier_trans_block, | |
351 | CPUFREQ_TRANSITION_NOTIFIER))) { | |
352 | cpufreq_unregister_notifier(¬ifier_policy_block, | |
353 | CPUFREQ_POLICY_NOTIFIER); | |
354 | return ret; | |
355 | } | |
356 | ||
65edc68c | 357 | register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); |
c32b6b8e | 358 | for_each_online_cpu(cpu) { |
55395ae7 | 359 | cpufreq_update_policy(cpu); |
c32b6b8e | 360 | } |
1da177e4 LT |
361 | return 0; |
362 | } | |
363 | static void | |
364 | __exit cpufreq_stats_exit(void) | |
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 | ||
378 | MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>"); | |
55395ae7 | 379 | MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats " |
e08f5f5b | 380 | "through sysfs filesystem"); |
1da177e4 LT |
381 | MODULE_LICENSE ("GPL"); |
382 | ||
383 | module_init(cpufreq_stats_init); | |
384 | module_exit(cpufreq_stats_exit); |