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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>. | |
5 | * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>. | |
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 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/sysdev.h> | |
15 | #include <linux/cpu.h> | |
16 | #include <linux/sysfs.h> | |
17 | #include <linux/cpufreq.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/percpu.h> | |
20 | #include <linux/kobject.h> | |
21 | #include <linux/spinlock.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 = {\ | |
28 | .attr = {.name = __stringify(_name), .owner = THIS_MODULE, \ | |
29 | .mode = _mode, }, \ | |
30 | .show = _show,\ | |
31 | }; | |
32 | ||
1da177e4 LT |
33 | struct cpufreq_stats { |
34 | unsigned int cpu; | |
35 | unsigned int total_trans; | |
58f1df25 | 36 | unsigned long long last_time; |
1da177e4 LT |
37 | unsigned int max_state; |
38 | unsigned int state_num; | |
39 | unsigned int last_index; | |
58f1df25 | 40 | cputime64_t *time_in_state; |
1da177e4 LT |
41 | unsigned int *freq_table; |
42 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
43 | unsigned int *trans_table; | |
44 | #endif | |
45 | }; | |
46 | ||
47 | static struct cpufreq_stats *cpufreq_stats_table[NR_CPUS]; | |
48 | ||
49 | struct cpufreq_stats_attribute { | |
50 | struct attribute attr; | |
51 | ssize_t(*show) (struct cpufreq_stats *, char *); | |
52 | }; | |
53 | ||
54 | static int | |
55 | cpufreq_stats_update (unsigned int cpu) | |
56 | { | |
57 | struct cpufreq_stats *stat; | |
58f1df25 VP |
58 | unsigned long long cur_time; |
59 | ||
60 | cur_time = get_jiffies_64(); | |
1da177e4 LT |
61 | spin_lock(&cpufreq_stats_lock); |
62 | stat = cpufreq_stats_table[cpu]; | |
63 | if (stat->time_in_state) | |
58f1df25 VP |
64 | stat->time_in_state[stat->last_index] = |
65 | cputime64_add(stat->time_in_state[stat->last_index], | |
66 | cputime_sub(cur_time, stat->last_time)); | |
67 | stat->last_time = cur_time; | |
1da177e4 LT |
68 | spin_unlock(&cpufreq_stats_lock); |
69 | return 0; | |
70 | } | |
71 | ||
72 | static ssize_t | |
73 | show_total_trans(struct cpufreq_policy *policy, char *buf) | |
74 | { | |
75 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
76 | if(!stat) | |
77 | return 0; | |
78 | return sprintf(buf, "%d\n", | |
79 | cpufreq_stats_table[stat->cpu]->total_trans); | |
80 | } | |
81 | ||
82 | static ssize_t | |
83 | show_time_in_state(struct cpufreq_policy *policy, char *buf) | |
84 | { | |
85 | ssize_t len = 0; | |
86 | int i; | |
87 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
88 | if(!stat) | |
89 | return 0; | |
90 | cpufreq_stats_update(stat->cpu); | |
91 | for (i = 0; i < stat->state_num; i++) { | |
58f1df25 VP |
92 | len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i], |
93 | (unsigned long long)cputime64_to_clock_t(stat->time_in_state[i])); | |
1da177e4 LT |
94 | } |
95 | return len; | |
96 | } | |
97 | ||
98 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
99 | static ssize_t | |
100 | show_trans_table(struct cpufreq_policy *policy, char *buf) | |
101 | { | |
102 | ssize_t len = 0; | |
103 | int i, j; | |
104 | ||
105 | struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu]; | |
106 | if(!stat) | |
107 | return 0; | |
108 | cpufreq_stats_update(stat->cpu); | |
58f1df25 VP |
109 | len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); |
110 | len += snprintf(buf + len, PAGE_SIZE - len, " : "); | |
111 | for (i = 0; i < stat->state_num; i++) { | |
112 | if (len >= PAGE_SIZE) | |
113 | break; | |
114 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", | |
115 | stat->freq_table[i]); | |
116 | } | |
117 | if (len >= PAGE_SIZE) | |
118 | return len; | |
119 | ||
120 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
121 | ||
1da177e4 LT |
122 | for (i = 0; i < stat->state_num; i++) { |
123 | if (len >= PAGE_SIZE) | |
124 | break; | |
58f1df25 VP |
125 | |
126 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ", | |
1da177e4 LT |
127 | stat->freq_table[i]); |
128 | ||
129 | for (j = 0; j < stat->state_num; j++) { | |
130 | if (len >= PAGE_SIZE) | |
131 | break; | |
58f1df25 | 132 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", |
1da177e4 LT |
133 | stat->trans_table[i*stat->max_state+j]); |
134 | } | |
135 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
136 | } | |
137 | return len; | |
138 | } | |
139 | CPUFREQ_STATDEVICE_ATTR(trans_table,0444,show_trans_table); | |
140 | #endif | |
141 | ||
142 | CPUFREQ_STATDEVICE_ATTR(total_trans,0444,show_total_trans); | |
143 | CPUFREQ_STATDEVICE_ATTR(time_in_state,0444,show_time_in_state); | |
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 | ||
158 | static int | |
159 | freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq) | |
160 | { | |
161 | int index; | |
162 | for (index = 0; index < stat->max_state; index++) | |
163 | if (stat->freq_table[index] == freq) | |
164 | return index; | |
165 | return -1; | |
166 | } | |
167 | ||
168 | static void | |
169 | cpufreq_stats_free_table (unsigned int cpu) | |
170 | { | |
171 | struct cpufreq_stats *stat = cpufreq_stats_table[cpu]; | |
172 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
173 | if (policy && policy->cpu == cpu) | |
174 | sysfs_remove_group(&policy->kobj, &stats_attr_group); | |
175 | if (stat) { | |
176 | kfree(stat->time_in_state); | |
177 | kfree(stat); | |
178 | } | |
179 | cpufreq_stats_table[cpu] = NULL; | |
180 | if (policy) | |
181 | cpufreq_cpu_put(policy); | |
182 | } | |
183 | ||
184 | static int | |
185 | cpufreq_stats_create_table (struct cpufreq_policy *policy, | |
186 | struct cpufreq_frequency_table *table) | |
187 | { | |
188 | unsigned int i, j, count = 0, ret = 0; | |
189 | struct cpufreq_stats *stat; | |
190 | struct cpufreq_policy *data; | |
191 | unsigned int alloc_size; | |
192 | unsigned int cpu = policy->cpu; | |
193 | if (cpufreq_stats_table[cpu]) | |
194 | return -EBUSY; | |
e98df50c | 195 | if ((stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL)) == NULL) |
1da177e4 | 196 | return -ENOMEM; |
1da177e4 LT |
197 | |
198 | data = cpufreq_cpu_get(cpu); | |
bc7b26fd DJ |
199 | if (data == NULL) { |
200 | ret = -EINVAL; | |
201 | goto error_get_fail; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group))) |
205 | goto error_out; | |
206 | ||
207 | stat->cpu = cpu; | |
208 | cpufreq_stats_table[cpu] = stat; | |
209 | ||
210 | for (i=0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
211 | unsigned int freq = table[i].frequency; | |
212 | if (freq == CPUFREQ_ENTRY_INVALID) | |
213 | continue; | |
214 | count++; | |
215 | } | |
216 | ||
58f1df25 | 217 | alloc_size = count * sizeof(int) + count * sizeof(cputime64_t); |
1da177e4 LT |
218 | |
219 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
220 | alloc_size += count * count * sizeof(int); | |
221 | #endif | |
222 | stat->max_state = count; | |
e98df50c | 223 | stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 LT |
224 | if (!stat->time_in_state) { |
225 | ret = -ENOMEM; | |
226 | goto error_out; | |
227 | } | |
1da177e4 LT |
228 | stat->freq_table = (unsigned int *)(stat->time_in_state + count); |
229 | ||
230 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
231 | stat->trans_table = stat->freq_table + count; | |
232 | #endif | |
233 | j = 0; | |
234 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
235 | unsigned int freq = table[i].frequency; | |
236 | if (freq == CPUFREQ_ENTRY_INVALID) | |
237 | continue; | |
238 | if (freq_table_get_index(stat, freq) == -1) | |
239 | stat->freq_table[j++] = freq; | |
240 | } | |
241 | stat->state_num = j; | |
242 | spin_lock(&cpufreq_stats_lock); | |
58f1df25 | 243 | stat->last_time = get_jiffies_64(); |
1da177e4 LT |
244 | stat->last_index = freq_table_get_index(stat, policy->cur); |
245 | spin_unlock(&cpufreq_stats_lock); | |
246 | cpufreq_cpu_put(data); | |
247 | return 0; | |
248 | error_out: | |
249 | cpufreq_cpu_put(data); | |
b7fb358c | 250 | error_get_fail: |
1da177e4 LT |
251 | kfree(stat); |
252 | cpufreq_stats_table[cpu] = NULL; | |
253 | return ret; | |
254 | } | |
255 | ||
256 | static int | |
257 | cpufreq_stat_notifier_policy (struct notifier_block *nb, unsigned long val, | |
258 | void *data) | |
259 | { | |
260 | int ret; | |
261 | struct cpufreq_policy *policy = data; | |
262 | struct cpufreq_frequency_table *table; | |
263 | unsigned int cpu = policy->cpu; | |
264 | if (val != CPUFREQ_NOTIFY) | |
265 | return 0; | |
266 | table = cpufreq_frequency_get_table(cpu); | |
267 | if (!table) | |
268 | return 0; | |
269 | if ((ret = cpufreq_stats_create_table(policy, table))) | |
270 | return ret; | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int | |
275 | cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val, | |
276 | void *data) | |
277 | { | |
278 | struct cpufreq_freqs *freq = data; | |
279 | struct cpufreq_stats *stat; | |
280 | int old_index, new_index; | |
281 | ||
282 | if (val != CPUFREQ_POSTCHANGE) | |
283 | return 0; | |
284 | ||
285 | stat = cpufreq_stats_table[freq->cpu]; | |
286 | if (!stat) | |
287 | return 0; | |
288 | old_index = freq_table_get_index(stat, freq->old); | |
289 | new_index = freq_table_get_index(stat, freq->new); | |
290 | ||
291 | cpufreq_stats_update(freq->cpu); | |
292 | if (old_index == new_index) | |
293 | return 0; | |
294 | ||
295 | spin_lock(&cpufreq_stats_lock); | |
296 | stat->last_index = new_index; | |
297 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
298 | stat->trans_table[old_index * stat->max_state + new_index]++; | |
299 | #endif | |
300 | stat->total_trans++; | |
301 | spin_unlock(&cpufreq_stats_lock); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static struct notifier_block notifier_policy_block = { | |
306 | .notifier_call = cpufreq_stat_notifier_policy | |
307 | }; | |
308 | ||
309 | static struct notifier_block notifier_trans_block = { | |
310 | .notifier_call = cpufreq_stat_notifier_trans | |
311 | }; | |
312 | ||
313 | static int | |
314 | __init cpufreq_stats_init(void) | |
315 | { | |
316 | int ret; | |
317 | unsigned int cpu; | |
318 | spin_lock_init(&cpufreq_stats_lock); | |
319 | if ((ret = cpufreq_register_notifier(¬ifier_policy_block, | |
320 | CPUFREQ_POLICY_NOTIFIER))) | |
321 | return ret; | |
322 | ||
323 | if ((ret = cpufreq_register_notifier(¬ifier_trans_block, | |
324 | CPUFREQ_TRANSITION_NOTIFIER))) { | |
325 | cpufreq_unregister_notifier(¬ifier_policy_block, | |
326 | CPUFREQ_POLICY_NOTIFIER); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | for_each_cpu(cpu) | |
331 | cpufreq_update_policy(cpu); | |
332 | return 0; | |
333 | } | |
334 | static void | |
335 | __exit cpufreq_stats_exit(void) | |
336 | { | |
337 | unsigned int cpu; | |
338 | cpufreq_unregister_notifier(¬ifier_policy_block, | |
339 | CPUFREQ_POLICY_NOTIFIER); | |
340 | cpufreq_unregister_notifier(¬ifier_trans_block, | |
341 | CPUFREQ_TRANSITION_NOTIFIER); | |
342 | for_each_cpu(cpu) | |
343 | cpufreq_stats_free_table(cpu); | |
344 | } | |
345 | ||
346 | MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>"); | |
347 | MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats through sysfs filesystem"); | |
348 | MODULE_LICENSE ("GPL"); | |
349 | ||
350 | module_init(cpufreq_stats_init); | |
351 | module_exit(cpufreq_stats_exit); |