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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 <linux/clk.h> | |
15 | #include <linux/cpumask.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/kobject.h> | |
18 | #include <linux/notifier.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/sysfs.h> | |
21 | ||
22 | /********************************************************************* | |
23 | * CPUFREQ INTERFACE * | |
24 | *********************************************************************/ | |
25 | /* | |
26 | * Frequency values here are CPU kHz | |
27 | * | |
28 | * Maximum transition latency is in nanoseconds - if it's unknown, | |
29 | * CPUFREQ_ETERNAL shall be used. | |
30 | */ | |
31 | ||
32 | #define CPUFREQ_ETERNAL (-1) | |
33 | #define CPUFREQ_NAME_LEN 16 | |
34 | /* Print length for names. Extra 1 space for accommodating '\n' in prints */ | |
35 | #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) | |
36 | ||
37 | struct cpufreq_governor; | |
38 | ||
39 | enum cpufreq_table_sorting { | |
40 | CPUFREQ_TABLE_UNSORTED, | |
41 | CPUFREQ_TABLE_SORTED_ASCENDING, | |
42 | CPUFREQ_TABLE_SORTED_DESCENDING | |
43 | }; | |
44 | ||
45 | struct cpufreq_freqs { | |
46 | unsigned int cpu; /* cpu nr */ | |
47 | unsigned int old; | |
48 | unsigned int new; | |
49 | u8 flags; /* flags of cpufreq_driver, see below. */ | |
50 | }; | |
51 | ||
52 | struct cpufreq_cpuinfo { | |
53 | unsigned int max_freq; | |
54 | unsigned int min_freq; | |
55 | ||
56 | /* in 10^(-9) s = nanoseconds */ | |
57 | unsigned int transition_latency; | |
58 | }; | |
59 | ||
60 | struct cpufreq_user_policy { | |
61 | unsigned int min; /* in kHz */ | |
62 | unsigned int max; /* in kHz */ | |
63 | }; | |
64 | ||
65 | struct cpufreq_policy { | |
66 | /* CPUs sharing clock, require sw coordination */ | |
67 | cpumask_var_t cpus; /* Online CPUs only */ | |
68 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
69 | cpumask_var_t real_cpus; /* Related and present */ | |
70 | ||
71 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs | |
72 | should set cpufreq */ | |
73 | unsigned int cpu; /* cpu managing this policy, must be online */ | |
74 | ||
75 | struct clk *clk; | |
76 | struct cpufreq_cpuinfo cpuinfo;/* see above */ | |
77 | ||
78 | unsigned int min; /* in kHz */ | |
79 | unsigned int max; /* in kHz */ | |
80 | unsigned int cur; /* in kHz, only needed if cpufreq | |
81 | * governors are used */ | |
82 | unsigned int restore_freq; /* = policy->cur before transition */ | |
83 | unsigned int suspend_freq; /* freq to set during suspend */ | |
84 | ||
85 | unsigned int policy; /* see above */ | |
86 | unsigned int last_policy; /* policy before unplug */ | |
87 | struct cpufreq_governor *governor; /* see below */ | |
88 | void *governor_data; | |
89 | char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ | |
90 | ||
91 | struct work_struct update; /* if update_policy() needs to be | |
92 | * called, but you're in IRQ context */ | |
93 | ||
94 | struct cpufreq_user_policy user_policy; | |
95 | struct cpufreq_frequency_table *freq_table; | |
96 | enum cpufreq_table_sorting freq_table_sorted; | |
97 | ||
98 | struct list_head policy_list; | |
99 | struct kobject kobj; | |
100 | struct completion kobj_unregister; | |
101 | ||
102 | /* | |
103 | * The rules for this semaphore: | |
104 | * - Any routine that wants to read from the policy structure will | |
105 | * do a down_read on this semaphore. | |
106 | * - Any routine that will write to the policy structure and/or may take away | |
107 | * the policy altogether (eg. CPU hotplug), will hold this lock in write | |
108 | * mode before doing so. | |
109 | */ | |
110 | struct rw_semaphore rwsem; | |
111 | ||
112 | /* | |
113 | * Fast switch flags: | |
114 | * - fast_switch_possible should be set by the driver if it can | |
115 | * guarantee that frequency can be changed on any CPU sharing the | |
116 | * policy and that the change will affect all of the policy CPUs then. | |
117 | * - fast_switch_enabled is to be set by governors that support fast | |
118 | * frequency switching with the help of cpufreq_enable_fast_switch(). | |
119 | */ | |
120 | bool fast_switch_possible; | |
121 | bool fast_switch_enabled; | |
122 | ||
123 | /* | |
124 | * Preferred average time interval between consecutive invocations of | |
125 | * the driver to set the frequency for this policy. To be set by the | |
126 | * scaling driver (0, which is the default, means no preference). | |
127 | */ | |
128 | unsigned int transition_delay_us; | |
129 | ||
130 | /* | |
131 | * Remote DVFS flag (Not added to the driver structure as we don't want | |
132 | * to access another structure from scheduler hotpath). | |
133 | * | |
134 | * Should be set if CPUs can do DVFS on behalf of other CPUs from | |
135 | * different cpufreq policies. | |
136 | */ | |
137 | bool dvfs_possible_from_any_cpu; | |
138 | ||
139 | /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ | |
140 | unsigned int cached_target_freq; | |
141 | int cached_resolved_idx; | |
142 | ||
143 | /* Synchronization for frequency transitions */ | |
144 | bool transition_ongoing; /* Tracks transition status */ | |
145 | spinlock_t transition_lock; | |
146 | wait_queue_head_t transition_wait; | |
147 | struct task_struct *transition_task; /* Task which is doing the transition */ | |
148 | ||
149 | /* cpufreq-stats */ | |
150 | struct cpufreq_stats *stats; | |
151 | ||
152 | /* For cpufreq driver's internal use */ | |
153 | void *driver_data; | |
154 | }; | |
155 | ||
156 | /* Only for ACPI */ | |
157 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ | |
158 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
159 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
160 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
161 | ||
162 | #ifdef CONFIG_CPU_FREQ | |
163 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); | |
164 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); | |
165 | void cpufreq_cpu_put(struct cpufreq_policy *policy); | |
166 | #else | |
167 | static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) | |
168 | { | |
169 | return NULL; | |
170 | } | |
171 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) | |
172 | { | |
173 | return NULL; | |
174 | } | |
175 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } | |
176 | #endif | |
177 | ||
178 | static inline bool policy_is_shared(struct cpufreq_policy *policy) | |
179 | { | |
180 | return cpumask_weight(policy->cpus) > 1; | |
181 | } | |
182 | ||
183 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ | |
184 | extern struct kobject *cpufreq_global_kobject; | |
185 | ||
186 | #ifdef CONFIG_CPU_FREQ | |
187 | unsigned int cpufreq_get(unsigned int cpu); | |
188 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
189 | unsigned int cpufreq_quick_get_max(unsigned int cpu); | |
190 | void disable_cpufreq(void); | |
191 | ||
192 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); | |
193 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); | |
194 | void cpufreq_update_policy(unsigned int cpu); | |
195 | bool have_governor_per_policy(void); | |
196 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); | |
197 | void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); | |
198 | void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); | |
199 | #else | |
200 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
201 | { | |
202 | return 0; | |
203 | } | |
204 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
205 | { | |
206 | return 0; | |
207 | } | |
208 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | static inline void disable_cpufreq(void) { } | |
213 | #endif | |
214 | ||
215 | #ifdef CONFIG_CPU_FREQ_STAT | |
216 | void cpufreq_stats_create_table(struct cpufreq_policy *policy); | |
217 | void cpufreq_stats_free_table(struct cpufreq_policy *policy); | |
218 | void cpufreq_stats_record_transition(struct cpufreq_policy *policy, | |
219 | unsigned int new_freq); | |
220 | #else | |
221 | static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } | |
222 | static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } | |
223 | static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, | |
224 | unsigned int new_freq) { } | |
225 | #endif /* CONFIG_CPU_FREQ_STAT */ | |
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 | #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ | |
234 | ||
235 | struct freq_attr { | |
236 | struct attribute attr; | |
237 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
238 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
239 | }; | |
240 | ||
241 | #define cpufreq_freq_attr_ro(_name) \ | |
242 | static struct freq_attr _name = \ | |
243 | __ATTR(_name, 0444, show_##_name, NULL) | |
244 | ||
245 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ | |
246 | static struct freq_attr _name = \ | |
247 | __ATTR(_name, _perm, show_##_name, NULL) | |
248 | ||
249 | #define cpufreq_freq_attr_rw(_name) \ | |
250 | static struct freq_attr _name = \ | |
251 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
252 | ||
253 | #define cpufreq_freq_attr_wo(_name) \ | |
254 | static struct freq_attr _name = \ | |
255 | __ATTR(_name, 0200, NULL, store_##_name) | |
256 | ||
257 | #define define_one_global_ro(_name) \ | |
258 | static struct kobj_attribute _name = \ | |
259 | __ATTR(_name, 0444, show_##_name, NULL) | |
260 | ||
261 | #define define_one_global_rw(_name) \ | |
262 | static struct kobj_attribute _name = \ | |
263 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
264 | ||
265 | ||
266 | struct cpufreq_driver { | |
267 | char name[CPUFREQ_NAME_LEN]; | |
268 | u8 flags; | |
269 | void *driver_data; | |
270 | ||
271 | /* needed by all drivers */ | |
272 | int (*init)(struct cpufreq_policy *policy); | |
273 | int (*verify)(struct cpufreq_policy *policy); | |
274 | ||
275 | /* define one out of two */ | |
276 | int (*setpolicy)(struct cpufreq_policy *policy); | |
277 | ||
278 | /* | |
279 | * On failure, should always restore frequency to policy->restore_freq | |
280 | * (i.e. old freq). | |
281 | */ | |
282 | int (*target)(struct cpufreq_policy *policy, | |
283 | unsigned int target_freq, | |
284 | unsigned int relation); /* Deprecated */ | |
285 | int (*target_index)(struct cpufreq_policy *policy, | |
286 | unsigned int index); | |
287 | unsigned int (*fast_switch)(struct cpufreq_policy *policy, | |
288 | unsigned int target_freq); | |
289 | ||
290 | /* | |
291 | * Caches and returns the lowest driver-supported frequency greater than | |
292 | * or equal to the target frequency, subject to any driver limitations. | |
293 | * Does not set the frequency. Only to be implemented for drivers with | |
294 | * target(). | |
295 | */ | |
296 | unsigned int (*resolve_freq)(struct cpufreq_policy *policy, | |
297 | unsigned int target_freq); | |
298 | ||
299 | /* | |
300 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION | |
301 | * unset. | |
302 | * | |
303 | * get_intermediate should return a stable intermediate frequency | |
304 | * platform wants to switch to and target_intermediate() should set CPU | |
305 | * to to that frequency, before jumping to the frequency corresponding | |
306 | * to 'index'. Core will take care of sending notifications and driver | |
307 | * doesn't have to handle them in target_intermediate() or | |
308 | * target_index(). | |
309 | * | |
310 | * Drivers can return '0' from get_intermediate() in case they don't | |
311 | * wish to switch to intermediate frequency for some target frequency. | |
312 | * In that case core will directly call ->target_index(). | |
313 | */ | |
314 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, | |
315 | unsigned int index); | |
316 | int (*target_intermediate)(struct cpufreq_policy *policy, | |
317 | unsigned int index); | |
318 | ||
319 | /* should be defined, if possible */ | |
320 | unsigned int (*get)(unsigned int cpu); | |
321 | ||
322 | /* optional */ | |
323 | int (*bios_limit)(int cpu, unsigned int *limit); | |
324 | ||
325 | int (*exit)(struct cpufreq_policy *policy); | |
326 | void (*stop_cpu)(struct cpufreq_policy *policy); | |
327 | int (*suspend)(struct cpufreq_policy *policy); | |
328 | int (*resume)(struct cpufreq_policy *policy); | |
329 | ||
330 | /* Will be called after the driver is fully initialized */ | |
331 | void (*ready)(struct cpufreq_policy *policy); | |
332 | ||
333 | struct freq_attr **attr; | |
334 | ||
335 | /* platform specific boost support code */ | |
336 | bool boost_enabled; | |
337 | int (*set_boost)(int state); | |
338 | }; | |
339 | ||
340 | /* flags */ | |
341 | #define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if | |
342 | all ->init() calls failed */ | |
343 | #define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other | |
344 | kernel "constants" aren't | |
345 | affected by frequency | |
346 | transitions */ | |
347 | #define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume | |
348 | speed mismatches */ | |
349 | ||
350 | /* | |
351 | * This should be set by platforms having multiple clock-domains, i.e. | |
352 | * supporting multiple policies. With this sysfs directories of governor would | |
353 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same | |
354 | * governor with different tunables for different clusters. | |
355 | */ | |
356 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) | |
357 | ||
358 | /* | |
359 | * Driver will do POSTCHANGE notifications from outside of their ->target() | |
360 | * routine and so must set cpufreq_driver->flags with this flag, so that core | |
361 | * can handle them specially. | |
362 | */ | |
363 | #define CPUFREQ_ASYNC_NOTIFICATION (1 << 4) | |
364 | ||
365 | /* | |
366 | * Set by drivers which want cpufreq core to check if CPU is running at a | |
367 | * frequency present in freq-table exposed by the driver. For these drivers if | |
368 | * CPU is found running at an out of table freq, we will try to set it to a freq | |
369 | * from the table. And if that fails, we will stop further boot process by | |
370 | * issuing a BUG_ON(). | |
371 | */ | |
372 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5) | |
373 | ||
374 | /* | |
375 | * Set by drivers to disallow use of governors with "dynamic_switching" flag | |
376 | * set. | |
377 | */ | |
378 | #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6) | |
379 | ||
380 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); | |
381 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
382 | ||
383 | const char *cpufreq_get_current_driver(void); | |
384 | void *cpufreq_get_driver_data(void); | |
385 | ||
386 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, | |
387 | unsigned int min, unsigned int max) | |
388 | { | |
389 | if (policy->min < min) | |
390 | policy->min = min; | |
391 | if (policy->max < min) | |
392 | policy->max = min; | |
393 | if (policy->min > max) | |
394 | policy->min = max; | |
395 | if (policy->max > max) | |
396 | policy->max = max; | |
397 | if (policy->min > policy->max) | |
398 | policy->min = policy->max; | |
399 | return; | |
400 | } | |
401 | ||
402 | static inline void | |
403 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) | |
404 | { | |
405 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, | |
406 | policy->cpuinfo.max_freq); | |
407 | } | |
408 | ||
409 | #ifdef CONFIG_CPU_FREQ | |
410 | void cpufreq_suspend(void); | |
411 | void cpufreq_resume(void); | |
412 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); | |
413 | #else | |
414 | static inline void cpufreq_suspend(void) {} | |
415 | static inline void cpufreq_resume(void) {} | |
416 | #endif | |
417 | ||
418 | /********************************************************************* | |
419 | * CPUFREQ NOTIFIER INTERFACE * | |
420 | *********************************************************************/ | |
421 | ||
422 | #define CPUFREQ_TRANSITION_NOTIFIER (0) | |
423 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
424 | ||
425 | /* Transition notifiers */ | |
426 | #define CPUFREQ_PRECHANGE (0) | |
427 | #define CPUFREQ_POSTCHANGE (1) | |
428 | ||
429 | /* Policy Notifiers */ | |
430 | #define CPUFREQ_ADJUST (0) | |
431 | #define CPUFREQ_NOTIFY (1) | |
432 | ||
433 | #ifdef CONFIG_CPU_FREQ | |
434 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
435 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
436 | ||
437 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, | |
438 | struct cpufreq_freqs *freqs); | |
439 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
440 | struct cpufreq_freqs *freqs, int transition_failed); | |
441 | ||
442 | #else /* CONFIG_CPU_FREQ */ | |
443 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
444 | unsigned int list) | |
445 | { | |
446 | return 0; | |
447 | } | |
448 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, | |
449 | unsigned int list) | |
450 | { | |
451 | return 0; | |
452 | } | |
453 | #endif /* !CONFIG_CPU_FREQ */ | |
454 | ||
455 | /** | |
456 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch | |
457 | * safe) | |
458 | * @old: old value | |
459 | * @div: divisor | |
460 | * @mult: multiplier | |
461 | * | |
462 | * | |
463 | * new = old * mult / div | |
464 | */ | |
465 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, | |
466 | u_int mult) | |
467 | { | |
468 | #if BITS_PER_LONG == 32 | |
469 | u64 result = ((u64) old) * ((u64) mult); | |
470 | do_div(result, div); | |
471 | return (unsigned long) result; | |
472 | ||
473 | #elif BITS_PER_LONG == 64 | |
474 | unsigned long result = old * ((u64) mult); | |
475 | result /= div; | |
476 | return result; | |
477 | #endif | |
478 | } | |
479 | ||
480 | /********************************************************************* | |
481 | * CPUFREQ GOVERNORS * | |
482 | *********************************************************************/ | |
483 | ||
484 | /* | |
485 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency | |
486 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
487 | * two generic policies are available: | |
488 | */ | |
489 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
490 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
491 | ||
492 | /* | |
493 | * The polling frequency depends on the capability of the processor. Default | |
494 | * polling frequency is 1000 times the transition latency of the processor. The | |
495 | * ondemand governor will work on any processor with transition latency <= 10ms, | |
496 | * using appropriate sampling rate. | |
497 | */ | |
498 | #define LATENCY_MULTIPLIER (1000) | |
499 | ||
500 | struct cpufreq_governor { | |
501 | char name[CPUFREQ_NAME_LEN]; | |
502 | int (*init)(struct cpufreq_policy *policy); | |
503 | void (*exit)(struct cpufreq_policy *policy); | |
504 | int (*start)(struct cpufreq_policy *policy); | |
505 | void (*stop)(struct cpufreq_policy *policy); | |
506 | void (*limits)(struct cpufreq_policy *policy); | |
507 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, | |
508 | char *buf); | |
509 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
510 | unsigned int freq); | |
511 | /* For governors which change frequency dynamically by themselves */ | |
512 | bool dynamic_switching; | |
513 | struct list_head governor_list; | |
514 | struct module *owner; | |
515 | }; | |
516 | ||
517 | /* Pass a target to the cpufreq driver */ | |
518 | unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, | |
519 | unsigned int target_freq); | |
520 | int cpufreq_driver_target(struct cpufreq_policy *policy, | |
521 | unsigned int target_freq, | |
522 | unsigned int relation); | |
523 | int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
524 | unsigned int target_freq, | |
525 | unsigned int relation); | |
526 | unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, | |
527 | unsigned int target_freq); | |
528 | unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy); | |
529 | int cpufreq_register_governor(struct cpufreq_governor *governor); | |
530 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
531 | ||
532 | struct cpufreq_governor *cpufreq_default_governor(void); | |
533 | struct cpufreq_governor *cpufreq_fallback_governor(void); | |
534 | ||
535 | static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) | |
536 | { | |
537 | if (policy->max < policy->cur) | |
538 | __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); | |
539 | else if (policy->min > policy->cur) | |
540 | __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); | |
541 | } | |
542 | ||
543 | /* Governor attribute set */ | |
544 | struct gov_attr_set { | |
545 | struct kobject kobj; | |
546 | struct list_head policy_list; | |
547 | struct mutex update_lock; | |
548 | int usage_count; | |
549 | }; | |
550 | ||
551 | /* sysfs ops for cpufreq governors */ | |
552 | extern const struct sysfs_ops governor_sysfs_ops; | |
553 | ||
554 | void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); | |
555 | void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); | |
556 | unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); | |
557 | ||
558 | /* Governor sysfs attribute */ | |
559 | struct governor_attr { | |
560 | struct attribute attr; | |
561 | ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); | |
562 | ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, | |
563 | size_t count); | |
564 | }; | |
565 | ||
566 | static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy) | |
567 | { | |
568 | /* | |
569 | * Allow remote callbacks if: | |
570 | * - dvfs_possible_from_any_cpu flag is set | |
571 | * - the local and remote CPUs share cpufreq policy | |
572 | */ | |
573 | return policy->dvfs_possible_from_any_cpu || | |
574 | cpumask_test_cpu(smp_processor_id(), policy->cpus); | |
575 | } | |
576 | ||
577 | /********************************************************************* | |
578 | * FREQUENCY TABLE HELPERS * | |
579 | *********************************************************************/ | |
580 | ||
581 | /* Special Values of .frequency field */ | |
582 | #define CPUFREQ_ENTRY_INVALID ~0u | |
583 | #define CPUFREQ_TABLE_END ~1u | |
584 | /* Special Values of .flags field */ | |
585 | #define CPUFREQ_BOOST_FREQ (1 << 0) | |
586 | ||
587 | struct cpufreq_frequency_table { | |
588 | unsigned int flags; | |
589 | unsigned int driver_data; /* driver specific data, not used by core */ | |
590 | unsigned int frequency; /* kHz - doesn't need to be in ascending | |
591 | * order */ | |
592 | }; | |
593 | ||
594 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) | |
595 | int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
596 | struct cpufreq_frequency_table **table); | |
597 | void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
598 | struct cpufreq_frequency_table **table); | |
599 | #else | |
600 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
601 | struct cpufreq_frequency_table | |
602 | **table) | |
603 | { | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
607 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
608 | struct cpufreq_frequency_table | |
609 | **table) | |
610 | { | |
611 | } | |
612 | #endif | |
613 | ||
614 | /* | |
615 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table | |
616 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
617 | * @table: the cpufreq_frequency_table * to iterate over. | |
618 | */ | |
619 | ||
620 | #define cpufreq_for_each_entry(pos, table) \ | |
621 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) | |
622 | ||
623 | /* | |
624 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table | |
625 | * excluding CPUFREQ_ENTRY_INVALID frequencies. | |
626 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
627 | * @table: the cpufreq_frequency_table * to iterate over. | |
628 | */ | |
629 | ||
630 | #define cpufreq_for_each_valid_entry(pos, table) \ | |
631 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ | |
632 | if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ | |
633 | continue; \ | |
634 | else | |
635 | ||
636 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, | |
637 | struct cpufreq_frequency_table *table); | |
638 | ||
639 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
640 | struct cpufreq_frequency_table *table); | |
641 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); | |
642 | ||
643 | int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, | |
644 | unsigned int target_freq, | |
645 | unsigned int relation); | |
646 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, | |
647 | unsigned int freq); | |
648 | ||
649 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); | |
650 | ||
651 | #ifdef CONFIG_CPU_FREQ | |
652 | int cpufreq_boost_trigger_state(int state); | |
653 | int cpufreq_boost_enabled(void); | |
654 | int cpufreq_enable_boost_support(void); | |
655 | bool policy_has_boost_freq(struct cpufreq_policy *policy); | |
656 | ||
657 | /* Find lowest freq at or above target in a table in ascending order */ | |
658 | static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, | |
659 | unsigned int target_freq) | |
660 | { | |
661 | struct cpufreq_frequency_table *table = policy->freq_table; | |
662 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
663 | unsigned int freq; | |
664 | ||
665 | cpufreq_for_each_valid_entry(pos, table) { | |
666 | freq = pos->frequency; | |
667 | ||
668 | if (freq >= target_freq) | |
669 | return pos - table; | |
670 | ||
671 | best = pos; | |
672 | } | |
673 | ||
674 | return best - table; | |
675 | } | |
676 | ||
677 | /* Find lowest freq at or above target in a table in descending order */ | |
678 | static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, | |
679 | unsigned int target_freq) | |
680 | { | |
681 | struct cpufreq_frequency_table *table = policy->freq_table; | |
682 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
683 | unsigned int freq; | |
684 | ||
685 | cpufreq_for_each_valid_entry(pos, table) { | |
686 | freq = pos->frequency; | |
687 | ||
688 | if (freq == target_freq) | |
689 | return pos - table; | |
690 | ||
691 | if (freq > target_freq) { | |
692 | best = pos; | |
693 | continue; | |
694 | } | |
695 | ||
696 | /* No freq found above target_freq */ | |
697 | if (best == table - 1) | |
698 | return pos - table; | |
699 | ||
700 | return best - table; | |
701 | } | |
702 | ||
703 | return best - table; | |
704 | } | |
705 | ||
706 | /* Works only on sorted freq-tables */ | |
707 | static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, | |
708 | unsigned int target_freq) | |
709 | { | |
710 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
711 | ||
712 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
713 | return cpufreq_table_find_index_al(policy, target_freq); | |
714 | else | |
715 | return cpufreq_table_find_index_dl(policy, target_freq); | |
716 | } | |
717 | ||
718 | /* Find highest freq at or below target in a table in ascending order */ | |
719 | static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, | |
720 | unsigned int target_freq) | |
721 | { | |
722 | struct cpufreq_frequency_table *table = policy->freq_table; | |
723 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
724 | unsigned int freq; | |
725 | ||
726 | cpufreq_for_each_valid_entry(pos, table) { | |
727 | freq = pos->frequency; | |
728 | ||
729 | if (freq == target_freq) | |
730 | return pos - table; | |
731 | ||
732 | if (freq < target_freq) { | |
733 | best = pos; | |
734 | continue; | |
735 | } | |
736 | ||
737 | /* No freq found below target_freq */ | |
738 | if (best == table - 1) | |
739 | return pos - table; | |
740 | ||
741 | return best - table; | |
742 | } | |
743 | ||
744 | return best - table; | |
745 | } | |
746 | ||
747 | /* Find highest freq at or below target in a table in descending order */ | |
748 | static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, | |
749 | unsigned int target_freq) | |
750 | { | |
751 | struct cpufreq_frequency_table *table = policy->freq_table; | |
752 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
753 | unsigned int freq; | |
754 | ||
755 | cpufreq_for_each_valid_entry(pos, table) { | |
756 | freq = pos->frequency; | |
757 | ||
758 | if (freq <= target_freq) | |
759 | return pos - table; | |
760 | ||
761 | best = pos; | |
762 | } | |
763 | ||
764 | return best - table; | |
765 | } | |
766 | ||
767 | /* Works only on sorted freq-tables */ | |
768 | static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, | |
769 | unsigned int target_freq) | |
770 | { | |
771 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
772 | ||
773 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
774 | return cpufreq_table_find_index_ah(policy, target_freq); | |
775 | else | |
776 | return cpufreq_table_find_index_dh(policy, target_freq); | |
777 | } | |
778 | ||
779 | /* Find closest freq to target in a table in ascending order */ | |
780 | static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, | |
781 | unsigned int target_freq) | |
782 | { | |
783 | struct cpufreq_frequency_table *table = policy->freq_table; | |
784 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
785 | unsigned int freq; | |
786 | ||
787 | cpufreq_for_each_valid_entry(pos, table) { | |
788 | freq = pos->frequency; | |
789 | ||
790 | if (freq == target_freq) | |
791 | return pos - table; | |
792 | ||
793 | if (freq < target_freq) { | |
794 | best = pos; | |
795 | continue; | |
796 | } | |
797 | ||
798 | /* No freq found below target_freq */ | |
799 | if (best == table - 1) | |
800 | return pos - table; | |
801 | ||
802 | /* Choose the closest freq */ | |
803 | if (target_freq - best->frequency > freq - target_freq) | |
804 | return pos - table; | |
805 | ||
806 | return best - table; | |
807 | } | |
808 | ||
809 | return best - table; | |
810 | } | |
811 | ||
812 | /* Find closest freq to target in a table in descending order */ | |
813 | static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, | |
814 | unsigned int target_freq) | |
815 | { | |
816 | struct cpufreq_frequency_table *table = policy->freq_table; | |
817 | struct cpufreq_frequency_table *pos, *best = table - 1; | |
818 | unsigned int freq; | |
819 | ||
820 | cpufreq_for_each_valid_entry(pos, table) { | |
821 | freq = pos->frequency; | |
822 | ||
823 | if (freq == target_freq) | |
824 | return pos - table; | |
825 | ||
826 | if (freq > target_freq) { | |
827 | best = pos; | |
828 | continue; | |
829 | } | |
830 | ||
831 | /* No freq found above target_freq */ | |
832 | if (best == table - 1) | |
833 | return pos - table; | |
834 | ||
835 | /* Choose the closest freq */ | |
836 | if (best->frequency - target_freq > target_freq - freq) | |
837 | return pos - table; | |
838 | ||
839 | return best - table; | |
840 | } | |
841 | ||
842 | return best - table; | |
843 | } | |
844 | ||
845 | /* Works only on sorted freq-tables */ | |
846 | static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, | |
847 | unsigned int target_freq) | |
848 | { | |
849 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
850 | ||
851 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
852 | return cpufreq_table_find_index_ac(policy, target_freq); | |
853 | else | |
854 | return cpufreq_table_find_index_dc(policy, target_freq); | |
855 | } | |
856 | ||
857 | static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
858 | unsigned int target_freq, | |
859 | unsigned int relation) | |
860 | { | |
861 | if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) | |
862 | return cpufreq_table_index_unsorted(policy, target_freq, | |
863 | relation); | |
864 | ||
865 | switch (relation) { | |
866 | case CPUFREQ_RELATION_L: | |
867 | return cpufreq_table_find_index_l(policy, target_freq); | |
868 | case CPUFREQ_RELATION_H: | |
869 | return cpufreq_table_find_index_h(policy, target_freq); | |
870 | case CPUFREQ_RELATION_C: | |
871 | return cpufreq_table_find_index_c(policy, target_freq); | |
872 | default: | |
873 | pr_err("%s: Invalid relation: %d\n", __func__, relation); | |
874 | return -EINVAL; | |
875 | } | |
876 | } | |
877 | ||
878 | static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy) | |
879 | { | |
880 | struct cpufreq_frequency_table *pos; | |
881 | int count = 0; | |
882 | ||
883 | if (unlikely(!policy->freq_table)) | |
884 | return 0; | |
885 | ||
886 | cpufreq_for_each_valid_entry(pos, policy->freq_table) | |
887 | count++; | |
888 | ||
889 | return count; | |
890 | } | |
891 | #else | |
892 | static inline int cpufreq_boost_trigger_state(int state) | |
893 | { | |
894 | return 0; | |
895 | } | |
896 | static inline int cpufreq_boost_enabled(void) | |
897 | { | |
898 | return 0; | |
899 | } | |
900 | ||
901 | static inline int cpufreq_enable_boost_support(void) | |
902 | { | |
903 | return -EINVAL; | |
904 | } | |
905 | ||
906 | static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) | |
907 | { | |
908 | return false; | |
909 | } | |
910 | #endif | |
911 | ||
912 | extern void arch_freq_prepare_all(void); | |
913 | extern unsigned int arch_freq_get_on_cpu(int cpu); | |
914 | ||
915 | extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq, | |
916 | unsigned long max_freq); | |
917 | ||
918 | /* the following are really really optional */ | |
919 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
920 | extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; | |
921 | extern struct freq_attr *cpufreq_generic_attr[]; | |
922 | int cpufreq_table_validate_and_show(struct cpufreq_policy *policy, | |
923 | struct cpufreq_frequency_table *table); | |
924 | ||
925 | unsigned int cpufreq_generic_get(unsigned int cpu); | |
926 | int cpufreq_generic_init(struct cpufreq_policy *policy, | |
927 | struct cpufreq_frequency_table *table, | |
928 | unsigned int transition_latency); | |
929 | #endif /* _LINUX_CPUFREQ_H */ |