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1 | /* |
2 | * linux/include/linux/cpufreq.h |
3 | * |
4 | * Copyright (C) 2001 Russell King |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> |
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 | #ifndef _LINUX_CPUFREQ_H |
12 | #define _LINUX_CPUFREQ_H |
13 | |
14 | #include <asm/cputime.h> |
15 | #include <linux/mutex.h> |
16 | #include <linux/notifier.h> |
17 | #include <linux/threads.h> |
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> |
23 | #include <asm/div64.h> |
24 | |
25 | #define CPUFREQ_NAME_LEN 16 |
26 | /* Print length for names. Extra 1 space for accomodating '\n' in prints */ |
27 | #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) |
28 | |
29 | |
30 | /********************************************************************* |
31 | * CPUFREQ NOTIFIER INTERFACE * |
32 | *********************************************************************/ |
33 | |
34 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
35 | #define CPUFREQ_POLICY_NOTIFIER (1) |
36 | |
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); |
40 | extern void disable_cpufreq(void); |
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 | } |
52 | static inline void disable_cpufreq(void) { } |
53 | #endif /* CONFIG_CPU_FREQ */ |
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 | |
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. |
66 | * Maximum transition latency is in nanoseconds - if it's unknown, |
67 | * CPUFREQ_ETERNAL shall be used. |
68 | */ |
69 | |
70 | struct cpufreq_governor; |
71 | |
72 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
73 | extern struct kobject *cpufreq_global_kobject; |
74 | |
75 | #define CPUFREQ_ETERNAL (-1) |
76 | struct cpufreq_cpuinfo { |
77 | unsigned int max_freq; |
78 | unsigned int min_freq; |
79 | |
80 | /* in 10^(-9) s = nanoseconds */ |
81 | unsigned int transition_latency; |
82 | }; |
83 | |
84 | struct cpufreq_real_policy { |
85 | unsigned int min; /* in kHz */ |
86 | unsigned int max; /* in kHz */ |
87 | unsigned int policy; /* see above */ |
88 | struct cpufreq_governor *governor; /* see below */ |
89 | }; |
90 | |
91 | struct cpufreq_policy { |
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 | |
96 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
97 | should set cpufreq */ |
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 */ |
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 */ |
107 | unsigned int policy; /* see above */ |
108 | struct cpufreq_governor *governor; /* see below */ |
109 | |
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 | |
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) |
124 | |
125 | /* Only for ACPI */ |
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*/ |
130 | |
131 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
132 | { |
133 | return cpumask_weight(policy->cpus) > 1; |
134 | } |
135 | |
136 | /******************** cpufreq transition notifiers *******************/ |
137 | |
138 | #define CPUFREQ_PRECHANGE (0) |
139 | #define CPUFREQ_POSTCHANGE (1) |
140 | #define CPUFREQ_RESUMECHANGE (8) |
141 | #define CPUFREQ_SUSPENDCHANGE (9) |
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]; |
187 | int initialized; |
188 | int (*governor) (struct cpufreq_policy *policy, |
189 | unsigned int event); |
190 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
191 | char *buf); |
192 | int (*store_setspeed) (struct cpufreq_policy *policy, |
193 | unsigned int freq); |
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 */ |
197 | struct list_head governor_list; |
198 | struct module *owner; |
199 | }; |
200 | |
201 | /* |
202 | * Pass a target to the cpufreq driver. |
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 | |
212 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy, |
213 | unsigned int cpu); |
214 | |
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 */ |
247 | unsigned int (*getavg) (struct cpufreq_policy *policy, |
248 | unsigned int cpu); |
249 | int (*bios_limit) (int cpu, unsigned int *limit); |
250 | |
251 | int (*exit) (struct cpufreq_policy *policy); |
252 | int (*suspend) (struct cpufreq_policy *policy); |
253 | int (*resume) (struct cpufreq_policy *policy); |
254 | struct freq_attr **attr; |
255 | }; |
256 | |
257 | /* flags */ |
258 | |
259 | #define CPUFREQ_STICKY 0x01 /* the driver isn't removed even if |
260 | * all ->init() calls failed */ |
261 | #define CPUFREQ_CONST_LOOPS 0x02 /* loops_per_jiffy or other kernel |
262 | * "constants" aren't affected by |
263 | * frequency transitions */ |
264 | #define CPUFREQ_PM_NO_WARN 0x04 /* don't warn on suspend/resume speed |
265 | * mismatches */ |
266 | |
267 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
268 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); |
269 | |
270 | |
271 | void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state); |
272 | |
273 | |
274 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, unsigned int min, unsigned int max) |
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 | |
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 | |
303 | #define cpufreq_freq_attr_rw(_name) \ |
304 | static struct freq_attr _name = \ |
305 | __ATTR(_name, 0644, show_##_name, store_##_name) |
306 | |
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 | }; |
314 | |
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 | |
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); |
326 | |
327 | /********************************************************************* |
328 | * CPUFREQ 2.6. INTERFACE * |
329 | *********************************************************************/ |
330 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
331 | int cpufreq_update_policy(unsigned int cpu); |
332 | |
333 | #ifdef CONFIG_CPU_FREQ |
334 | /* query the current CPU frequency (in kHz). If zero, cpufreq couldn't detect it */ |
335 | unsigned int cpufreq_get(unsigned int cpu); |
336 | #else |
337 | static inline unsigned int cpufreq_get(unsigned int cpu) |
338 | { |
339 | return 0; |
340 | } |
341 | #endif |
342 | |
343 | /* query the last known CPU freq (in kHz). If zero, cpufreq couldn't detect it */ |
344 | #ifdef CONFIG_CPU_FREQ |
345 | unsigned int cpufreq_quick_get(unsigned int cpu); |
346 | unsigned int cpufreq_quick_get_max(unsigned int cpu); |
347 | #else |
348 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) |
349 | { |
350 | return 0; |
351 | } |
352 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
353 | { |
354 | return 0; |
355 | } |
356 | #endif |
357 | |
358 | |
359 | /********************************************************************* |
360 | * CPUFREQ DEFAULT GOVERNOR * |
361 | *********************************************************************/ |
362 | |
363 | |
364 | /* |
365 | Performance governor is fallback governor if any other gov failed to |
366 | auto load due latency restrictions |
367 | */ |
368 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE |
369 | extern struct cpufreq_governor cpufreq_gov_performance; |
370 | #endif |
371 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
372 | #define CPUFREQ_DEFAULT_GOVERNOR (&cpufreq_gov_performance) |
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) |
376 | #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE) |
377 | extern struct cpufreq_governor cpufreq_gov_userspace; |
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) |
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); |
415 | |
416 | /* the following are really really optional */ |
417 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; |
418 | |
419 | void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table, |
420 | unsigned int cpu); |
421 | void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy); |
422 | |
423 | void cpufreq_frequency_table_put_attr(unsigned int cpu); |
424 | #endif /* _LINUX_CPUFREQ_H */ |
425 |
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