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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/cpufreq.h | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
335dc333 | 6 | * |
1da177e4 LT |
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 | #ifndef _LINUX_CPUFREQ_H | |
12 | #define _LINUX_CPUFREQ_H | |
13 | ||
2aacdfff | 14 | #include <asm/cputime.h> |
83933af4 | 15 | #include <linux/mutex.h> |
1da177e4 LT |
16 | #include <linux/notifier.h> |
17 | #include <linux/threads.h> | |
1da177e4 LT |
18 | #include <linux/kobject.h> |
19 | #include <linux/sysfs.h> | |
20 | #include <linux/completion.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/cpumask.h> | |
4e57b681 | 23 | #include <asm/div64.h> |
1da177e4 LT |
24 | |
25 | #define CPUFREQ_NAME_LEN 16 | |
4b972f0b | 26 | /* Print length for names. Extra 1 space for accomodating '\n' in prints */ |
27 | #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) | |
1da177e4 LT |
28 | |
29 | ||
30 | /********************************************************************* | |
31 | * CPUFREQ NOTIFIER INTERFACE * | |
32 | *********************************************************************/ | |
33 | ||
1da177e4 LT |
34 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
35 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
36 | ||
6070b5de SS |
37 | #ifdef CONFIG_CPU_FREQ |
38 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
39 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
a7b422cd | 40 | extern void disable_cpufreq(void); |
6070b5de SS |
41 | #else /* CONFIG_CPU_FREQ */ |
42 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
43 | unsigned int list) | |
44 | { | |
45 | return 0; | |
46 | } | |
47 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, | |
48 | unsigned int list) | |
49 | { | |
50 | return 0; | |
51 | } | |
a7b422cd | 52 | static inline void disable_cpufreq(void) { } |
6070b5de | 53 | #endif /* CONFIG_CPU_FREQ */ |
1da177e4 LT |
54 | |
55 | /* if (cpufreq_driver->target) exists, the ->governor decides what frequency | |
56 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
57 | * two generic policies are available: | |
58 | */ | |
59 | ||
60 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
61 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
62 | ||
335dc333 TF |
63 | /* Frequency values here are CPU kHz so that hardware which doesn't run |
64 | * with some frequencies can complain without having to guess what per | |
65 | * cent / per mille means. | |
b53cc6ea | 66 | * Maximum transition latency is in nanoseconds - if it's unknown, |
1da177e4 LT |
67 | * CPUFREQ_ETERNAL shall be used. |
68 | */ | |
69 | ||
70 | struct cpufreq_governor; | |
71 | ||
8aa84ad8 TR |
72 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
73 | extern struct kobject *cpufreq_global_kobject; | |
2361be23 VK |
74 | int cpufreq_get_global_kobject(void); |
75 | void cpufreq_put_global_kobject(void); | |
76 | int cpufreq_sysfs_create_file(const struct attribute *attr); | |
77 | void cpufreq_sysfs_remove_file(const struct attribute *attr); | |
8aa84ad8 | 78 | |
1da177e4 LT |
79 | #define CPUFREQ_ETERNAL (-1) |
80 | struct cpufreq_cpuinfo { | |
81 | unsigned int max_freq; | |
82 | unsigned int min_freq; | |
335dc333 TF |
83 | |
84 | /* in 10^(-9) s = nanoseconds */ | |
85 | unsigned int transition_latency; | |
1da177e4 LT |
86 | }; |
87 | ||
88 | struct cpufreq_real_policy { | |
89 | unsigned int min; /* in kHz */ | |
90 | unsigned int max; /* in kHz */ | |
335dc333 | 91 | unsigned int policy; /* see above */ |
1da177e4 LT |
92 | struct cpufreq_governor *governor; /* see below */ |
93 | }; | |
94 | ||
95 | struct cpufreq_policy { | |
951fc5f4 VK |
96 | /* CPUs sharing clock, require sw coordination */ |
97 | cpumask_var_t cpus; /* Online CPUs only */ | |
98 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
99 | ||
62b36cc1 | 100 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
3b2d9942 | 101 | should set cpufreq */ |
b8eed8af VK |
102 | unsigned int cpu; /* cpu nr of CPU managing this policy */ |
103 | unsigned int last_cpu; /* cpu nr of previous CPU that managed | |
104 | * this policy */ | |
1da177e4 LT |
105 | struct cpufreq_cpuinfo cpuinfo;/* see above */ |
106 | ||
107 | unsigned int min; /* in kHz */ | |
108 | unsigned int max; /* in kHz */ | |
109 | unsigned int cur; /* in kHz, only needed if cpufreq | |
110 | * governors are used */ | |
335dc333 | 111 | unsigned int policy; /* see above */ |
1da177e4 | 112 | struct cpufreq_governor *governor; /* see below */ |
7bd353a9 | 113 | void *governor_data; |
95731ebb | 114 | bool governor_enabled; /* governor start/stop flag */ |
1da177e4 | 115 | |
1da177e4 LT |
116 | struct work_struct update; /* if update_policy() needs to be |
117 | * called, but you're in IRQ context */ | |
118 | ||
119 | struct cpufreq_real_policy user_policy; | |
120 | ||
121 | struct kobject kobj; | |
122 | struct completion kobj_unregister; | |
123 | }; | |
124 | ||
b8eed8af VK |
125 | #define CPUFREQ_ADJUST (0) |
126 | #define CPUFREQ_INCOMPATIBLE (1) | |
127 | #define CPUFREQ_NOTIFY (2) | |
128 | #define CPUFREQ_START (3) | |
129 | #define CPUFREQ_UPDATE_POLICY_CPU (4) | |
1da177e4 | 130 | |
62b36cc1 | 131 | /* Only for ACPI */ |
46f18e3a VP |
132 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
133 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
134 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
135 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 | 136 | |
2624f90c FB |
137 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
138 | { | |
139 | return cpumask_weight(policy->cpus) > 1; | |
140 | } | |
141 | ||
1da177e4 LT |
142 | /******************** cpufreq transition notifiers *******************/ |
143 | ||
144 | #define CPUFREQ_PRECHANGE (0) | |
145 | #define CPUFREQ_POSTCHANGE (1) | |
146 | #define CPUFREQ_RESUMECHANGE (8) | |
42d4dc3f | 147 | #define CPUFREQ_SUSPENDCHANGE (9) |
1da177e4 LT |
148 | |
149 | struct cpufreq_freqs { | |
150 | unsigned int cpu; /* cpu nr */ | |
151 | unsigned int old; | |
152 | unsigned int new; | |
153 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
154 | }; | |
155 | ||
156 | ||
157 | /** | |
158 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe) | |
159 | * @old: old value | |
160 | * @div: divisor | |
161 | * @mult: multiplier | |
162 | * | |
163 | * | |
164 | * new = old * mult / div | |
165 | */ | |
166 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult) | |
167 | { | |
168 | #if BITS_PER_LONG == 32 | |
169 | ||
170 | u64 result = ((u64) old) * ((u64) mult); | |
171 | do_div(result, div); | |
172 | return (unsigned long) result; | |
173 | ||
174 | #elif BITS_PER_LONG == 64 | |
175 | ||
176 | unsigned long result = old * ((u64) mult); | |
177 | result /= div; | |
178 | return result; | |
179 | ||
180 | #endif | |
181 | }; | |
182 | ||
183 | /********************************************************************* | |
184 | * CPUFREQ GOVERNORS * | |
185 | *********************************************************************/ | |
186 | ||
7bd353a9 VK |
187 | #define CPUFREQ_GOV_START 1 |
188 | #define CPUFREQ_GOV_STOP 2 | |
189 | #define CPUFREQ_GOV_LIMITS 3 | |
190 | #define CPUFREQ_GOV_POLICY_INIT 4 | |
191 | #define CPUFREQ_GOV_POLICY_EXIT 5 | |
1da177e4 LT |
192 | |
193 | struct cpufreq_governor { | |
194 | char name[CPUFREQ_NAME_LEN]; | |
b394058f | 195 | int initialized; |
335dc333 | 196 | int (*governor) (struct cpufreq_policy *policy, |
1da177e4 | 197 | unsigned int event); |
9e76988e VP |
198 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
199 | char *buf); | |
335dc333 | 200 | int (*store_setspeed) (struct cpufreq_policy *policy, |
9e76988e | 201 | unsigned int freq); |
1c256245 TR |
202 | unsigned int max_transition_latency; /* HW must be able to switch to |
203 | next freq faster than this value in nano secs or we | |
204 | will fallback to performance governor */ | |
1da177e4 LT |
205 | struct list_head governor_list; |
206 | struct module *owner; | |
207 | }; | |
208 | ||
335dc333 TF |
209 | /* |
210 | * Pass a target to the cpufreq driver. | |
1da177e4 LT |
211 | */ |
212 | extern int cpufreq_driver_target(struct cpufreq_policy *policy, | |
213 | unsigned int target_freq, | |
214 | unsigned int relation); | |
215 | extern int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
216 | unsigned int target_freq, | |
217 | unsigned int relation); | |
218 | ||
219 | ||
bf0b90e3 | 220 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, |
221 | unsigned int cpu); | |
dfde5d62 | 222 | |
1da177e4 LT |
223 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
224 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
225 | ||
226 | ||
227 | /********************************************************************* | |
228 | * CPUFREQ DRIVER INTERFACE * | |
229 | *********************************************************************/ | |
230 | ||
231 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ | |
232 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
233 | ||
234 | struct freq_attr; | |
235 | ||
236 | struct cpufreq_driver { | |
237 | struct module *owner; | |
238 | char name[CPUFREQ_NAME_LEN]; | |
239 | u8 flags; | |
4d5dcc42 VK |
240 | /* |
241 | * This should be set by platforms having multiple clock-domains, i.e. | |
242 | * supporting multiple policies. With this sysfs directories of governor | |
243 | * would be created in cpu/cpu<num>/cpufreq/ directory and so they can | |
244 | * use the same governor with different tunables for different clusters. | |
245 | */ | |
246 | bool have_governor_per_policy; | |
1da177e4 LT |
247 | |
248 | /* needed by all drivers */ | |
249 | int (*init) (struct cpufreq_policy *policy); | |
250 | int (*verify) (struct cpufreq_policy *policy); | |
251 | ||
252 | /* define one out of two */ | |
253 | int (*setpolicy) (struct cpufreq_policy *policy); | |
254 | int (*target) (struct cpufreq_policy *policy, | |
255 | unsigned int target_freq, | |
256 | unsigned int relation); | |
257 | ||
258 | /* should be defined, if possible */ | |
259 | unsigned int (*get) (unsigned int cpu); | |
260 | ||
261 | /* optional */ | |
bf0b90e3 | 262 | unsigned int (*getavg) (struct cpufreq_policy *policy, |
263 | unsigned int cpu); | |
e2f74f35 | 264 | int (*bios_limit) (int cpu, unsigned int *limit); |
bf0b90e3 | 265 | |
1da177e4 | 266 | int (*exit) (struct cpufreq_policy *policy); |
7ca64e2d | 267 | int (*suspend) (struct cpufreq_policy *policy); |
1da177e4 LT |
268 | int (*resume) (struct cpufreq_policy *policy); |
269 | struct freq_attr **attr; | |
270 | }; | |
271 | ||
272 | /* flags */ | |
273 | ||
335dc333 | 274 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if |
1da177e4 | 275 | * all ->init() calls failed */ |
335dc333 | 276 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel |
1da177e4 LT |
277 | * "constants" aren't affected by |
278 | * frequency transitions */ | |
42d4dc3f BH |
279 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed |
280 | * mismatches */ | |
1da177e4 | 281 | |
221dee28 LT |
282 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
283 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 LT |
284 | |
285 | ||
b43a7ffb VK |
286 | void cpufreq_notify_transition(struct cpufreq_policy *policy, |
287 | struct cpufreq_freqs *freqs, unsigned int state); | |
1da177e4 | 288 | |
335dc333 | 289 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) |
1da177e4 LT |
290 | { |
291 | if (policy->min < min) | |
292 | policy->min = min; | |
293 | if (policy->max < min) | |
294 | policy->max = min; | |
295 | if (policy->min > max) | |
296 | policy->min = max; | |
297 | if (policy->max > max) | |
298 | policy->max = max; | |
299 | if (policy->min > policy->max) | |
300 | policy->min = policy->max; | |
301 | return; | |
302 | } | |
303 | ||
304 | struct freq_attr { | |
305 | struct attribute attr; | |
306 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
307 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
308 | }; | |
309 | ||
6dad2a29 BP |
310 | #define cpufreq_freq_attr_ro(_name) \ |
311 | static struct freq_attr _name = \ | |
312 | __ATTR(_name, 0444, show_##_name, NULL) | |
313 | ||
314 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ | |
315 | static struct freq_attr _name = \ | |
316 | __ATTR(_name, _perm, show_##_name, NULL) | |
317 | ||
6dad2a29 BP |
318 | #define cpufreq_freq_attr_rw(_name) \ |
319 | static struct freq_attr _name = \ | |
320 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
321 | ||
8aa84ad8 TR |
322 | struct global_attr { |
323 | struct attribute attr; | |
324 | ssize_t (*show)(struct kobject *kobj, | |
325 | struct attribute *attr, char *buf); | |
326 | ssize_t (*store)(struct kobject *a, struct attribute *b, | |
327 | const char *c, size_t count); | |
328 | }; | |
1da177e4 | 329 | |
6dad2a29 BP |
330 | #define define_one_global_ro(_name) \ |
331 | static struct global_attr _name = \ | |
332 | __ATTR(_name, 0444, show_##_name, NULL) | |
333 | ||
334 | #define define_one_global_rw(_name) \ | |
335 | static struct global_attr _name = \ | |
336 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
337 | ||
ab45bd9b BP |
338 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
339 | void cpufreq_cpu_put(struct cpufreq_policy *data); | |
340 | const char *cpufreq_get_current_driver(void); | |
6dad2a29 | 341 | |
1da177e4 LT |
342 | /********************************************************************* |
343 | * CPUFREQ 2.6. INTERFACE * | |
344 | *********************************************************************/ | |
72a4ce34 | 345 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
1da177e4 LT |
346 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
347 | int cpufreq_update_policy(unsigned int cpu); | |
4d5dcc42 | 348 | bool have_governor_per_policy(void); |
944e9a03 | 349 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); |
1da177e4 | 350 | |
2eca40a8 | 351 | #ifdef CONFIG_CPU_FREQ |
ff0ce684 LT |
352 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |
353 | unsigned int cpufreq_get(unsigned int cpu); | |
2eca40a8 RD |
354 | #else |
355 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
356 | { | |
357 | return 0; | |
358 | } | |
359 | #endif | |
1da177e4 | 360 | |
ff0ce684 | 361 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ |
95235ca2 VP |
362 | #ifdef CONFIG_CPU_FREQ |
363 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
3d737108 | 364 | unsigned int cpufreq_quick_get_max(unsigned int cpu); |
95235ca2 VP |
365 | #else |
366 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
367 | { | |
368 | return 0; | |
369 | } | |
3d737108 JB |
370 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
371 | { | |
372 | return 0; | |
373 | } | |
95235ca2 VP |
374 | #endif |
375 | ||
1da177e4 LT |
376 | |
377 | /********************************************************************* | |
378 | * CPUFREQ DEFAULT GOVERNOR * | |
379 | *********************************************************************/ | |
380 | ||
381 | ||
1c256245 TR |
382 | /* |
383 | Performance governor is fallback governor if any other gov failed to | |
384 | auto load due latency restrictions | |
385 | */ | |
6afde10c | 386 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
1da177e4 | 387 | extern struct cpufreq_governor cpufreq_gov_performance; |
6afde10c | 388 | #endif |
1c256245 TR |
389 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
390 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
30d221db AG |
391 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) |
392 | extern struct cpufreq_governor cpufreq_gov_powersave; | |
393 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) | |
1da177e4 LT |
394 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
395 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
1c256245 TR |
396 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
397 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
398 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
399 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
400 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
401 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
402 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
1da177e4 LT |
403 | #endif |
404 | ||
405 | ||
406 | /********************************************************************* | |
407 | * FREQUENCY TABLE HELPERS * | |
408 | *********************************************************************/ | |
409 | ||
410 | #define CPUFREQ_ENTRY_INVALID ~0 | |
411 | #define CPUFREQ_TABLE_END ~1 | |
412 | ||
413 | struct cpufreq_frequency_table { | |
50701588 | 414 | unsigned int driver_data; /* driver specific data, not used by core */ |
1da177e4 LT |
415 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
416 | * order */ | |
417 | }; | |
418 | ||
419 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
420 | struct cpufreq_frequency_table *table); | |
421 | ||
422 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
423 | struct cpufreq_frequency_table *table); | |
424 | ||
425 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
426 | struct cpufreq_frequency_table *table, | |
427 | unsigned int target_freq, | |
428 | unsigned int relation, | |
429 | unsigned int *index); | |
430 | ||
431 | /* the following 3 funtions are for cpufreq core use only */ | |
432 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); | |
1da177e4 LT |
433 | |
434 | /* the following are really really optional */ | |
435 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
436 | ||
335dc333 | 437 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, |
1da177e4 | 438 | unsigned int cpu); |
b8eed8af | 439 | void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); |
1da177e4 LT |
440 | |
441 | void cpufreq_frequency_table_put_attr(unsigned int cpu); | |
1da177e4 | 442 | #endif /* _LINUX_CPUFREQ_H */ |