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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 VK |
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; | |
74 | ||
1da177e4 LT |
75 | #define CPUFREQ_ETERNAL (-1) |
76 | struct cpufreq_cpuinfo { | |
77 | unsigned int max_freq; | |
78 | unsigned int min_freq; | |
335dc333 TF |
79 | |
80 | /* in 10^(-9) s = nanoseconds */ | |
81 | unsigned int transition_latency; | |
1da177e4 LT |
82 | }; |
83 | ||
84 | struct cpufreq_real_policy { | |
85 | unsigned int min; /* in kHz */ | |
86 | unsigned int max; /* in kHz */ | |
335dc333 | 87 | unsigned int policy; /* see above */ |
1da177e4 LT |
88 | struct cpufreq_governor *governor; /* see below */ |
89 | }; | |
90 | ||
91 | struct cpufreq_policy { | |
951fc5f4 VK |
92 | /* CPUs sharing clock, require sw coordination */ |
93 | cpumask_var_t cpus; /* Online CPUs only */ | |
94 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
95 | ||
62b36cc1 | 96 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
3b2d9942 | 97 | should set cpufreq */ |
b8eed8af VK |
98 | unsigned int cpu; /* cpu nr of CPU managing this policy */ |
99 | unsigned int last_cpu; /* cpu nr of previous CPU that managed | |
100 | * this policy */ | |
1da177e4 LT |
101 | struct cpufreq_cpuinfo cpuinfo;/* see above */ |
102 | ||
103 | unsigned int min; /* in kHz */ | |
104 | unsigned int max; /* in kHz */ | |
105 | unsigned int cur; /* in kHz, only needed if cpufreq | |
106 | * governors are used */ | |
335dc333 | 107 | unsigned int policy; /* see above */ |
1da177e4 LT |
108 | struct cpufreq_governor *governor; /* see below */ |
109 | ||
1da177e4 LT |
110 | struct work_struct update; /* if update_policy() needs to be |
111 | * called, but you're in IRQ context */ | |
112 | ||
113 | struct cpufreq_real_policy user_policy; | |
114 | ||
115 | struct kobject kobj; | |
116 | struct completion kobj_unregister; | |
117 | }; | |
118 | ||
b8eed8af VK |
119 | #define CPUFREQ_ADJUST (0) |
120 | #define CPUFREQ_INCOMPATIBLE (1) | |
121 | #define CPUFREQ_NOTIFY (2) | |
122 | #define CPUFREQ_START (3) | |
123 | #define CPUFREQ_UPDATE_POLICY_CPU (4) | |
1da177e4 | 124 | |
62b36cc1 | 125 | /* Only for ACPI */ |
46f18e3a VP |
126 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
127 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
128 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
129 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 | 130 | |
2624f90c FB |
131 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
132 | { | |
133 | return cpumask_weight(policy->cpus) > 1; | |
134 | } | |
135 | ||
1da177e4 LT |
136 | /******************** cpufreq transition notifiers *******************/ |
137 | ||
138 | #define CPUFREQ_PRECHANGE (0) | |
139 | #define CPUFREQ_POSTCHANGE (1) | |
140 | #define CPUFREQ_RESUMECHANGE (8) | |
42d4dc3f | 141 | #define CPUFREQ_SUSPENDCHANGE (9) |
1da177e4 LT |
142 | |
143 | struct cpufreq_freqs { | |
144 | unsigned int cpu; /* cpu nr */ | |
145 | unsigned int old; | |
146 | unsigned int new; | |
147 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
148 | }; | |
149 | ||
150 | ||
151 | /** | |
152 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch safe) | |
153 | * @old: old value | |
154 | * @div: divisor | |
155 | * @mult: multiplier | |
156 | * | |
157 | * | |
158 | * new = old * mult / div | |
159 | */ | |
160 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, u_int mult) | |
161 | { | |
162 | #if BITS_PER_LONG == 32 | |
163 | ||
164 | u64 result = ((u64) old) * ((u64) mult); | |
165 | do_div(result, div); | |
166 | return (unsigned long) result; | |
167 | ||
168 | #elif BITS_PER_LONG == 64 | |
169 | ||
170 | unsigned long result = old * ((u64) mult); | |
171 | result /= div; | |
172 | return result; | |
173 | ||
174 | #endif | |
175 | }; | |
176 | ||
177 | /********************************************************************* | |
178 | * CPUFREQ GOVERNORS * | |
179 | *********************************************************************/ | |
180 | ||
181 | #define CPUFREQ_GOV_START 1 | |
182 | #define CPUFREQ_GOV_STOP 2 | |
183 | #define CPUFREQ_GOV_LIMITS 3 | |
184 | ||
185 | struct cpufreq_governor { | |
186 | char name[CPUFREQ_NAME_LEN]; | |
b394058f | 187 | int initialized; |
335dc333 | 188 | int (*governor) (struct cpufreq_policy *policy, |
1da177e4 | 189 | unsigned int event); |
9e76988e VP |
190 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
191 | char *buf); | |
335dc333 | 192 | int (*store_setspeed) (struct cpufreq_policy *policy, |
9e76988e | 193 | unsigned int freq); |
1c256245 TR |
194 | unsigned int max_transition_latency; /* HW must be able to switch to |
195 | next freq faster than this value in nano secs or we | |
196 | will fallback to performance governor */ | |
1da177e4 LT |
197 | struct list_head governor_list; |
198 | struct module *owner; | |
199 | }; | |
200 | ||
335dc333 TF |
201 | /* |
202 | * Pass a target to the cpufreq driver. | |
1da177e4 LT |
203 | */ |
204 | extern int cpufreq_driver_target(struct cpufreq_policy *policy, | |
205 | unsigned int target_freq, | |
206 | unsigned int relation); | |
207 | extern int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
208 | unsigned int target_freq, | |
209 | unsigned int relation); | |
210 | ||
211 | ||
bf0b90e3 | 212 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, |
213 | unsigned int cpu); | |
dfde5d62 | 214 | |
1da177e4 LT |
215 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
216 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
217 | ||
218 | ||
219 | /********************************************************************* | |
220 | * CPUFREQ DRIVER INTERFACE * | |
221 | *********************************************************************/ | |
222 | ||
223 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ | |
224 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
225 | ||
226 | struct freq_attr; | |
227 | ||
228 | struct cpufreq_driver { | |
229 | struct module *owner; | |
230 | char name[CPUFREQ_NAME_LEN]; | |
231 | u8 flags; | |
232 | ||
233 | /* needed by all drivers */ | |
234 | int (*init) (struct cpufreq_policy *policy); | |
235 | int (*verify) (struct cpufreq_policy *policy); | |
236 | ||
237 | /* define one out of two */ | |
238 | int (*setpolicy) (struct cpufreq_policy *policy); | |
239 | int (*target) (struct cpufreq_policy *policy, | |
240 | unsigned int target_freq, | |
241 | unsigned int relation); | |
242 | ||
243 | /* should be defined, if possible */ | |
244 | unsigned int (*get) (unsigned int cpu); | |
245 | ||
246 | /* optional */ | |
bf0b90e3 | 247 | unsigned int (*getavg) (struct cpufreq_policy *policy, |
248 | unsigned int cpu); | |
e2f74f35 | 249 | int (*bios_limit) (int cpu, unsigned int *limit); |
bf0b90e3 | 250 | |
1da177e4 | 251 | int (*exit) (struct cpufreq_policy *policy); |
7ca64e2d | 252 | int (*suspend) (struct cpufreq_policy *policy); |
1da177e4 LT |
253 | int (*resume) (struct cpufreq_policy *policy); |
254 | struct freq_attr **attr; | |
255 | }; | |
256 | ||
257 | /* flags */ | |
258 | ||
335dc333 | 259 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if |
1da177e4 | 260 | * all ->init() calls failed */ |
335dc333 | 261 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel |
1da177e4 LT |
262 | * "constants" aren't affected by |
263 | * frequency transitions */ | |
42d4dc3f BH |
264 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed |
265 | * mismatches */ | |
1da177e4 | 266 | |
221dee28 LT |
267 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
268 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 LT |
269 | |
270 | ||
271 | void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); | |
272 | ||
273 | ||
335dc333 | 274 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) |
1da177e4 LT |
275 | { |
276 | if (policy->min < min) | |
277 | policy->min = min; | |
278 | if (policy->max < min) | |
279 | policy->max = min; | |
280 | if (policy->min > max) | |
281 | policy->min = max; | |
282 | if (policy->max > max) | |
283 | policy->max = max; | |
284 | if (policy->min > policy->max) | |
285 | policy->min = policy->max; | |
286 | return; | |
287 | } | |
288 | ||
289 | struct freq_attr { | |
290 | struct attribute attr; | |
291 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
292 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
293 | }; | |
294 | ||
6dad2a29 BP |
295 | #define cpufreq_freq_attr_ro(_name) \ |
296 | static struct freq_attr _name = \ | |
297 | __ATTR(_name, 0444, show_##_name, NULL) | |
298 | ||
299 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ | |
300 | static struct freq_attr _name = \ | |
301 | __ATTR(_name, _perm, show_##_name, NULL) | |
302 | ||
6dad2a29 BP |
303 | #define cpufreq_freq_attr_rw(_name) \ |
304 | static struct freq_attr _name = \ | |
305 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
306 | ||
8aa84ad8 TR |
307 | struct global_attr { |
308 | struct attribute attr; | |
309 | ssize_t (*show)(struct kobject *kobj, | |
310 | struct attribute *attr, char *buf); | |
311 | ssize_t (*store)(struct kobject *a, struct attribute *b, | |
312 | const char *c, size_t count); | |
313 | }; | |
1da177e4 | 314 | |
6dad2a29 BP |
315 | #define define_one_global_ro(_name) \ |
316 | static struct global_attr _name = \ | |
317 | __ATTR(_name, 0444, show_##_name, NULL) | |
318 | ||
319 | #define define_one_global_rw(_name) \ | |
320 | static struct global_attr _name = \ | |
321 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
322 | ||
ab45bd9b BP |
323 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
324 | void cpufreq_cpu_put(struct cpufreq_policy *data); | |
325 | const char *cpufreq_get_current_driver(void); | |
6dad2a29 | 326 | |
1da177e4 LT |
327 | /********************************************************************* |
328 | * CPUFREQ 2.6. INTERFACE * | |
329 | *********************************************************************/ | |
1da177e4 LT |
330 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
331 | int cpufreq_update_policy(unsigned int cpu); | |
332 | ||
2eca40a8 | 333 | #ifdef CONFIG_CPU_FREQ |
ff0ce684 LT |
334 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |
335 | unsigned int cpufreq_get(unsigned int cpu); | |
2eca40a8 RD |
336 | #else |
337 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
338 | { | |
339 | return 0; | |
340 | } | |
341 | #endif | |
1da177e4 | 342 | |
ff0ce684 | 343 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ |
95235ca2 VP |
344 | #ifdef CONFIG_CPU_FREQ |
345 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
3d737108 | 346 | unsigned int cpufreq_quick_get_max(unsigned int cpu); |
95235ca2 VP |
347 | #else |
348 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
349 | { | |
350 | return 0; | |
351 | } | |
3d737108 JB |
352 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
353 | { | |
354 | return 0; | |
355 | } | |
95235ca2 VP |
356 | #endif |
357 | ||
1da177e4 LT |
358 | |
359 | /********************************************************************* | |
360 | * CPUFREQ DEFAULT GOVERNOR * | |
361 | *********************************************************************/ | |
362 | ||
363 | ||
1c256245 TR |
364 | /* |
365 | Performance governor is fallback governor if any other gov failed to | |
366 | auto load due latency restrictions | |
367 | */ | |
6afde10c | 368 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
1da177e4 | 369 | extern struct cpufreq_governor cpufreq_gov_performance; |
6afde10c | 370 | #endif |
1c256245 TR |
371 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
372 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) | |
30d221db AG |
373 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE) |
374 | extern struct cpufreq_governor cpufreq_gov_powersave; | |
375 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_powersave) | |
1da177e4 LT |
376 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
377 | extern struct cpufreq_governor cpufreq_gov_userspace; | |
1c256245 TR |
378 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_userspace) |
379 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND) | |
380 | extern struct cpufreq_governor cpufreq_gov_ondemand; | |
381 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_ondemand) | |
382 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE) | |
383 | extern struct cpufreq_governor cpufreq_gov_conservative; | |
384 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_conservative) | |
1da177e4 LT |
385 | #endif |
386 | ||
387 | ||
388 | /********************************************************************* | |
389 | * FREQUENCY TABLE HELPERS * | |
390 | *********************************************************************/ | |
391 | ||
392 | #define CPUFREQ_ENTRY_INVALID ~0 | |
393 | #define CPUFREQ_TABLE_END ~1 | |
394 | ||
395 | struct cpufreq_frequency_table { | |
396 | unsigned int index; /* any */ | |
397 | unsigned int frequency; /* kHz - doesn't need to be in ascending | |
398 | * order */ | |
399 | }; | |
400 | ||
401 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
402 | struct cpufreq_frequency_table *table); | |
403 | ||
404 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
405 | struct cpufreq_frequency_table *table); | |
406 | ||
407 | int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
408 | struct cpufreq_frequency_table *table, | |
409 | unsigned int target_freq, | |
410 | unsigned int relation, | |
411 | unsigned int *index); | |
412 | ||
413 | /* the following 3 funtions are for cpufreq core use only */ | |
414 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu); | |
1da177e4 LT |
415 | |
416 | /* the following are really really optional */ | |
417 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
418 | ||
335dc333 | 419 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, |
1da177e4 | 420 | unsigned int cpu); |
b8eed8af | 421 | void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); |
1da177e4 LT |
422 | |
423 | void cpufreq_frequency_table_put_attr(unsigned int cpu); | |
1da177e4 | 424 | #endif /* _LINUX_CPUFREQ_H */ |