1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/include/linux/cpufreq.h
4 *
5 * Copyright (C) 2001 Russell King
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
7 */
8 #ifndef _LINUX_CPUFREQ_H
9 #define _LINUX_CPUFREQ_H
10
11 #include <linux/clk.h>
12 #include <linux/cpu.h>
13 #include <linux/cpumask.h>
14 #include <linux/completion.h>
15 #include <linux/kobject.h>
16 #include <linux/notifier.h>
17 #include <linux/of.h>
18 #include <linux/pm_opp.h>
19 #include <linux/pm_qos.h>
20 #include <linux/spinlock.h>
21 #include <linux/sysfs.h>
22 #include <linux/minmax.h>
23
24 /*********************************************************************
25 * CPUFREQ INTERFACE *
26 *********************************************************************/
27 /*
28 * Frequency values here are CPU kHz
29 */
30
31 #define CPUFREQ_DEFAULT_TRANSITION_LATENCY_NS NSEC_PER_MSEC
32
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_cpuinfo {
46 unsigned int max_freq;
47 unsigned int min_freq;
48
49 /* in 10^(-9) s = nanoseconds */
50 unsigned int transition_latency;
51 };
52
53 struct cpufreq_policy {
54 /* CPUs sharing clock, require sw coordination */
55 cpumask_var_t cpus; /* Online CPUs only */
56 cpumask_var_t related_cpus; /* Online + Offline CPUs */
57 cpumask_var_t real_cpus; /* Related and present */
58
59 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
60 should set cpufreq */
61 unsigned int cpu; /* cpu managing this policy, must be online */
62
63 struct clk *clk;
64 struct cpufreq_cpuinfo cpuinfo;/* see above */
65
66 unsigned int min; /* in kHz */
67 unsigned int max; /* in kHz */
68 unsigned int cur; /* in kHz, only needed if cpufreq
69 * governors are used */
70 unsigned int suspend_freq; /* freq to set during suspend */
71
72 unsigned int policy; /* see above */
73 unsigned int last_policy; /* policy before unplug */
74 struct cpufreq_governor *governor; /* see below */
75 void *governor_data;
76 char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
77
78 struct work_struct update; /* if update_policy() needs to be
79 * called, but you're in IRQ context */
80
81 struct freq_constraints constraints;
82 struct freq_qos_request min_freq_req;
83 struct freq_qos_request max_freq_req;
84 struct freq_qos_request boost_freq_req;
85
86 struct cpufreq_frequency_table *freq_table;
87 enum cpufreq_table_sorting freq_table_sorted;
88
89 struct list_head policy_list;
90 struct kobject kobj;
91 struct completion kobj_unregister;
92
93 /*
94 * The rules for this semaphore:
95 * - Any routine that wants to read from the policy structure will
96 * do a down_read on this semaphore.
97 * - Any routine that will write to the policy structure and/or may take away
98 * the policy altogether (eg. CPU hotplug), will hold this lock in write
99 * mode before doing so.
100 */
101 struct rw_semaphore rwsem;
102
103 /*
104 * Fast switch flags:
105 * - fast_switch_possible should be set by the driver if it can
106 * guarantee that frequency can be changed on any CPU sharing the
107 * policy and that the change will affect all of the policy CPUs then.
108 * - fast_switch_enabled is to be set by governors that support fast
109 * frequency switching with the help of cpufreq_enable_fast_switch().
110 */
111 bool fast_switch_possible;
112 bool fast_switch_enabled;
113
114 /*
115 * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
116 * governor.
117 */
118 bool strict_target;
119
120 /*
121 * Set if inefficient frequencies were found in the frequency table.
122 * This indicates if the relation flag CPUFREQ_RELATION_E can be
123 * honored.
124 */
125 bool efficiencies_available;
126
127 /*
128 * Preferred average time interval between consecutive invocations of
129 * the driver to set the frequency for this policy. To be set by the
130 * scaling driver (0, which is the default, means no preference).
131 */
132 unsigned int transition_delay_us;
133
134 /*
135 * Remote DVFS flag (Not added to the driver structure as we don't want
136 * to access another structure from scheduler hotpath).
137 *
138 * Should be set if CPUs can do DVFS on behalf of other CPUs from
139 * different cpufreq policies.
140 */
141 bool dvfs_possible_from_any_cpu;
142
143 /* Per policy boost enabled flag. */
144 bool boost_enabled;
145
146 /* Per policy boost supported flag. */
147 bool boost_supported;
148
149 /* Pending policy->min/max update for the driver */
150 bool update_limits;
151
152 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
153 unsigned int cached_target_freq;
154 unsigned int cached_resolved_idx;
155
156 /* Synchronization for frequency transitions */
157 bool transition_ongoing; /* Tracks transition status */
158 spinlock_t transition_lock;
159 wait_queue_head_t transition_wait;
160 struct task_struct *transition_task; /* Task which is doing the transition */
161
162 /* cpufreq-stats */
163 struct cpufreq_stats *stats;
164
165 /* For cpufreq driver's internal use */
166 void *driver_data;
167
168 /* Pointer to the cooling device if used for thermal mitigation */
169 struct thermal_cooling_device *cdev;
170
171 struct notifier_block nb_min;
172 struct notifier_block nb_max;
173 };
174
175 DEFINE_GUARD(cpufreq_policy_write, struct cpufreq_policy *,
176 down_write(&_T->rwsem), up_write(&_T->rwsem))
177
178 DEFINE_GUARD(cpufreq_policy_read, struct cpufreq_policy *,
179 down_read(&_T->rwsem), up_read(&_T->rwsem))
180
181 /*
182 * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
183 * callback for sanitization. That callback is only expected to modify the min
184 * and max values, if necessary, and specifically it must not update the
185 * frequency table.
186 */
187 struct cpufreq_policy_data {
188 struct cpufreq_cpuinfo cpuinfo;
189 struct cpufreq_frequency_table *freq_table;
190 unsigned int cpu;
191 unsigned int min; /* in kHz */
192 unsigned int max; /* in kHz */
193 };
194
195 struct cpufreq_freqs {
196 struct cpufreq_policy *policy;
197 unsigned int old;
198 unsigned int new;
199 u8 flags; /* flags of cpufreq_driver, see below. */
200 };
201
202 /* Only for ACPI */
203 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
204 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
205 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
206 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
207
208 #ifdef CONFIG_CPU_FREQ
209 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
210 struct cpufreq_policy *cpufreq_cpu_policy(unsigned int cpu);
211 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
212 void cpufreq_cpu_put(struct cpufreq_policy *policy);
213 #else
cpufreq_cpu_get_raw(unsigned int cpu)214 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
215 {
216 return NULL;
217 }
cpufreq_cpu_policy(unsigned int cpu)218 static inline struct cpufreq_policy *cpufreq_cpu_policy(unsigned int cpu)
219 {
220 return NULL;
221 }
cpufreq_cpu_get(unsigned int cpu)222 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
223 {
224 return NULL;
225 }
cpufreq_cpu_put(struct cpufreq_policy * policy)226 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
227 #endif
228
229 /* Scope based cleanup macro for cpufreq_policy kobject reference counting */
DEFINE_FREE(put_cpufreq_policy,struct cpufreq_policy *,if (_T)cpufreq_cpu_put (_T))230 DEFINE_FREE(put_cpufreq_policy, struct cpufreq_policy *, if (_T) cpufreq_cpu_put(_T))
231
232 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
233 {
234 return cpumask_empty(policy->cpus);
235 }
236
policy_is_shared(struct cpufreq_policy * policy)237 static inline bool policy_is_shared(struct cpufreq_policy *policy)
238 {
239 return cpumask_nth(1, policy->cpus) < nr_cpumask_bits;
240 }
241
242 #ifdef CONFIG_CPU_FREQ
243 unsigned int cpufreq_get(unsigned int cpu);
244 unsigned int cpufreq_quick_get(unsigned int cpu);
245 unsigned int cpufreq_quick_get_max(unsigned int cpu);
246 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
247 void disable_cpufreq(void);
248
249 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
250
251 void refresh_frequency_limits(struct cpufreq_policy *policy);
252 void cpufreq_update_policy(unsigned int cpu);
253 void cpufreq_update_limits(unsigned int cpu);
254 bool have_governor_per_policy(void);
255 bool cpufreq_supports_freq_invariance(void);
256 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
257 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
258 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
259 bool has_target_index(void);
260
261 DECLARE_PER_CPU(unsigned long, cpufreq_pressure);
cpufreq_get_pressure(int cpu)262 static inline unsigned long cpufreq_get_pressure(int cpu)
263 {
264 return READ_ONCE(per_cpu(cpufreq_pressure, cpu));
265 }
266 #else
cpufreq_get(unsigned int cpu)267 static inline unsigned int cpufreq_get(unsigned int cpu)
268 {
269 return 0;
270 }
cpufreq_quick_get(unsigned int cpu)271 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
272 {
273 return 0;
274 }
cpufreq_quick_get_max(unsigned int cpu)275 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
276 {
277 return 0;
278 }
cpufreq_get_hw_max_freq(unsigned int cpu)279 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
280 {
281 return 0;
282 }
cpufreq_supports_freq_invariance(void)283 static inline bool cpufreq_supports_freq_invariance(void)
284 {
285 return false;
286 }
disable_cpufreq(void)287 static inline void disable_cpufreq(void) { }
cpufreq_update_limits(unsigned int cpu)288 static inline void cpufreq_update_limits(unsigned int cpu) { }
cpufreq_get_pressure(int cpu)289 static inline unsigned long cpufreq_get_pressure(int cpu)
290 {
291 return 0;
292 }
293 #endif
294
295 #ifdef CONFIG_CPU_FREQ_STAT
296 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
297 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
298 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
299 unsigned int new_freq);
300 #else
cpufreq_stats_create_table(struct cpufreq_policy * policy)301 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
cpufreq_stats_free_table(struct cpufreq_policy * policy)302 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
cpufreq_stats_record_transition(struct cpufreq_policy * policy,unsigned int new_freq)303 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
304 unsigned int new_freq) { }
305 #endif /* CONFIG_CPU_FREQ_STAT */
306
307 /*********************************************************************
308 * CPUFREQ DRIVER INTERFACE *
309 *********************************************************************/
310
311 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
312 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
313 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */
314 /* relation flags */
315 #define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */
316
317 #define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E)
318 #define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E)
319 #define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E)
320
321 struct freq_attr {
322 struct attribute attr;
323 ssize_t (*show)(struct cpufreq_policy *, char *);
324 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
325 };
326
327 #define cpufreq_freq_attr_ro(_name) \
328 static struct freq_attr _name = \
329 __ATTR(_name, 0444, show_##_name, NULL)
330
331 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
332 static struct freq_attr _name = \
333 __ATTR(_name, _perm, show_##_name, NULL)
334
335 #define cpufreq_freq_attr_rw(_name) \
336 static struct freq_attr _name = \
337 __ATTR(_name, 0644, show_##_name, store_##_name)
338
339 #define cpufreq_freq_attr_wo(_name) \
340 static struct freq_attr _name = \
341 __ATTR(_name, 0200, NULL, store_##_name)
342
343 #define define_one_global_ro(_name) \
344 static struct kobj_attribute _name = \
345 __ATTR(_name, 0444, show_##_name, NULL)
346
347 #define define_one_global_rw(_name) \
348 static struct kobj_attribute _name = \
349 __ATTR(_name, 0644, show_##_name, store_##_name)
350
351
352 struct cpufreq_driver {
353 char name[CPUFREQ_NAME_LEN];
354 u16 flags;
355 void *driver_data;
356
357 /* needed by all drivers */
358 int (*init)(struct cpufreq_policy *policy);
359 int (*verify)(struct cpufreq_policy_data *policy);
360
361 /* define one out of two */
362 int (*setpolicy)(struct cpufreq_policy *policy);
363
364 int (*target)(struct cpufreq_policy *policy,
365 unsigned int target_freq,
366 unsigned int relation); /* Deprecated */
367 int (*target_index)(struct cpufreq_policy *policy,
368 unsigned int index);
369 unsigned int (*fast_switch)(struct cpufreq_policy *policy,
370 unsigned int target_freq);
371 /*
372 * ->fast_switch() replacement for drivers that use an internal
373 * representation of performance levels and can pass hints other than
374 * the target performance level to the hardware. This can only be set
375 * if ->fast_switch is set too, because in those cases (under specific
376 * conditions) scale invariance can be disabled, which causes the
377 * schedutil governor to fall back to the latter.
378 */
379 void (*adjust_perf)(struct cpufreq_policy *policy,
380 unsigned long min_perf,
381 unsigned long target_perf,
382 unsigned long max_perf,
383 unsigned long capacity);
384
385 /*
386 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
387 * unset.
388 *
389 * get_intermediate should return a stable intermediate frequency
390 * platform wants to switch to and target_intermediate() should set CPU
391 * to that frequency, before jumping to the frequency corresponding
392 * to 'index'. Core will take care of sending notifications and driver
393 * doesn't have to handle them in target_intermediate() or
394 * target_index().
395 *
396 * Drivers can return '0' from get_intermediate() in case they don't
397 * wish to switch to intermediate frequency for some target frequency.
398 * In that case core will directly call ->target_index().
399 */
400 unsigned int (*get_intermediate)(struct cpufreq_policy *policy,
401 unsigned int index);
402 int (*target_intermediate)(struct cpufreq_policy *policy,
403 unsigned int index);
404
405 /* should be defined, if possible, return 0 on error */
406 unsigned int (*get)(unsigned int cpu);
407
408 /* Called to update policy limits on firmware notifications. */
409 void (*update_limits)(struct cpufreq_policy *policy);
410
411 /* optional */
412 int (*bios_limit)(int cpu, unsigned int *limit);
413
414 int (*online)(struct cpufreq_policy *policy);
415 int (*offline)(struct cpufreq_policy *policy);
416 void (*exit)(struct cpufreq_policy *policy);
417 int (*suspend)(struct cpufreq_policy *policy);
418 int (*resume)(struct cpufreq_policy *policy);
419
420 /* Will be called after the driver is fully initialized */
421 void (*ready)(struct cpufreq_policy *policy);
422
423 /* Return the capacity reference frequency for policy. */
424 unsigned int (*scale_freq_ref)(struct cpufreq_policy *policy);
425
426 struct freq_attr **attr;
427
428 /* platform specific boost support code */
429 bool boost_enabled;
430 int (*set_boost)(struct cpufreq_policy *policy, int state);
431
432 /*
433 * Set by drivers that want to register with the energy model after the
434 * policy is properly initialized, but before the governor is started.
435 */
436 void (*register_em)(struct cpufreq_policy *policy);
437 };
438
439 /* flags */
440
441 /*
442 * Set by drivers that need to update internal upper and lower boundaries along
443 * with the target frequency and so the core and governors should also invoke
444 * the driver if the target frequency does not change, but the policy min or max
445 * may have changed.
446 */
447 #define CPUFREQ_NEED_UPDATE_LIMITS BIT(0)
448
449 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
450 #define CPUFREQ_CONST_LOOPS BIT(1)
451
452 /*
453 * Set by drivers that want the core to automatically register the cpufreq
454 * driver as a thermal cooling device.
455 */
456 #define CPUFREQ_IS_COOLING_DEV BIT(2)
457
458 /*
459 * This should be set by platforms having multiple clock-domains, i.e.
460 * supporting multiple policies. With this sysfs directories of governor would
461 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
462 * governor with different tunables for different clusters.
463 */
464 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY BIT(3)
465
466 /*
467 * Driver will do POSTCHANGE notifications from outside of their ->target()
468 * routine and so must set cpufreq_driver->flags with this flag, so that core
469 * can handle them specially.
470 */
471 #define CPUFREQ_ASYNC_NOTIFICATION BIT(4)
472
473 /*
474 * Set by drivers which want cpufreq core to check if CPU is running at a
475 * frequency present in freq-table exposed by the driver. For these drivers if
476 * CPU is found running at an out of table freq, we will try to set it to a freq
477 * from the table. And if that fails, we will stop further boot process by
478 * issuing a BUG_ON().
479 */
480 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
481
482 /*
483 * Set by drivers to disallow use of governors with "dynamic_switching" flag
484 * set.
485 */
486 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING BIT(6)
487
488 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
489 void cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
490
491 bool cpufreq_driver_test_flags(u16 flags);
492 const char *cpufreq_get_current_driver(void);
493 void *cpufreq_get_driver_data(void);
494
cpufreq_thermal_control_enabled(struct cpufreq_driver * drv)495 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
496 {
497 return IS_ENABLED(CONFIG_CPU_THERMAL) &&
498 (drv->flags & CPUFREQ_IS_COOLING_DEV);
499 }
500
cpufreq_verify_within_limits(struct cpufreq_policy_data * policy,unsigned int min,unsigned int max)501 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
502 unsigned int min,
503 unsigned int max)
504 {
505 policy->max = clamp(policy->max, min, max);
506 policy->min = clamp(policy->min, min, policy->max);
507 }
508
509 static inline void
cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data * policy)510 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
511 {
512 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
513 policy->cpuinfo.max_freq);
514 }
515
516 #ifdef CONFIG_CPU_FREQ
517 void cpufreq_suspend(void);
518 void cpufreq_resume(void);
519 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
520 #else
cpufreq_suspend(void)521 static inline void cpufreq_suspend(void) {}
cpufreq_resume(void)522 static inline void cpufreq_resume(void) {}
523 #endif
524
525 /*********************************************************************
526 * CPUFREQ NOTIFIER INTERFACE *
527 *********************************************************************/
528
529 #define CPUFREQ_TRANSITION_NOTIFIER (0)
530 #define CPUFREQ_POLICY_NOTIFIER (1)
531
532 /* Transition notifiers */
533 #define CPUFREQ_PRECHANGE (0)
534 #define CPUFREQ_POSTCHANGE (1)
535
536 /* Policy Notifiers */
537 #define CPUFREQ_CREATE_POLICY (0)
538 #define CPUFREQ_REMOVE_POLICY (1)
539
540 #ifdef CONFIG_CPU_FREQ
541 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
542 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
543
544 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
545 struct cpufreq_freqs *freqs);
546 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
547 struct cpufreq_freqs *freqs, int transition_failed);
548
549 #else /* CONFIG_CPU_FREQ */
cpufreq_register_notifier(struct notifier_block * nb,unsigned int list)550 static inline int cpufreq_register_notifier(struct notifier_block *nb,
551 unsigned int list)
552 {
553 return 0;
554 }
cpufreq_unregister_notifier(struct notifier_block * nb,unsigned int list)555 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
556 unsigned int list)
557 {
558 return 0;
559 }
560 #endif /* !CONFIG_CPU_FREQ */
561
562 /**
563 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
564 * safe)
565 * @old: old value
566 * @div: divisor
567 * @mult: multiplier
568 *
569 *
570 * new = old * mult / div
571 */
cpufreq_scale(unsigned long old,u_int div,u_int mult)572 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
573 u_int mult)
574 {
575 #if BITS_PER_LONG == 32
576 u64 result = ((u64) old) * ((u64) mult);
577 do_div(result, div);
578 return (unsigned long) result;
579
580 #elif BITS_PER_LONG == 64
581 unsigned long result = old * ((u64) mult);
582 result /= div;
583 return result;
584 #endif
585 }
586
587 /*********************************************************************
588 * CPUFREQ GOVERNORS *
589 *********************************************************************/
590
591 #define CPUFREQ_POLICY_UNKNOWN (0)
592 /*
593 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
594 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
595 * two generic policies are available:
596 */
597 #define CPUFREQ_POLICY_POWERSAVE (1)
598 #define CPUFREQ_POLICY_PERFORMANCE (2)
599
600 struct cpufreq_governor {
601 char name[CPUFREQ_NAME_LEN];
602 int (*init)(struct cpufreq_policy *policy);
603 void (*exit)(struct cpufreq_policy *policy);
604 int (*start)(struct cpufreq_policy *policy);
605 void (*stop)(struct cpufreq_policy *policy);
606 void (*limits)(struct cpufreq_policy *policy);
607 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
608 char *buf);
609 int (*store_setspeed) (struct cpufreq_policy *policy,
610 unsigned int freq);
611 struct list_head governor_list;
612 struct module *owner;
613 u8 flags;
614 };
615
616 /* Governor flags */
617
618 /* For governors which change frequency dynamically by themselves */
619 #define CPUFREQ_GOV_DYNAMIC_SWITCHING BIT(0)
620
621 /* For governors wanting the target frequency to be set exactly */
622 #define CPUFREQ_GOV_STRICT_TARGET BIT(1)
623
624
625 /* Pass a target to the cpufreq driver */
626 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
627 unsigned int target_freq);
628 void cpufreq_driver_adjust_perf(struct cpufreq_policy *policy,
629 unsigned long min_perf,
630 unsigned long target_perf,
631 unsigned long max_perf,
632 unsigned long capacity);
633 bool cpufreq_driver_has_adjust_perf(void);
634 int cpufreq_driver_target(struct cpufreq_policy *policy,
635 unsigned int target_freq,
636 unsigned int relation);
637 int __cpufreq_driver_target(struct cpufreq_policy *policy,
638 unsigned int target_freq,
639 unsigned int relation);
640 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
641 unsigned int target_freq);
642 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
643 int cpufreq_register_governor(struct cpufreq_governor *governor);
644 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
645 int cpufreq_start_governor(struct cpufreq_policy *policy);
646 void cpufreq_stop_governor(struct cpufreq_policy *policy);
647
648 #define cpufreq_governor_init(__governor) \
649 static int __init __governor##_init(void) \
650 { \
651 return cpufreq_register_governor(&__governor); \
652 } \
653 core_initcall(__governor##_init)
654
655 #define cpufreq_governor_exit(__governor) \
656 static void __exit __governor##_exit(void) \
657 { \
658 return cpufreq_unregister_governor(&__governor); \
659 } \
660 module_exit(__governor##_exit)
661
662 struct cpufreq_governor *cpufreq_default_governor(void);
663 struct cpufreq_governor *cpufreq_fallback_governor(void);
664
665 #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
666 bool sugov_is_governor(struct cpufreq_policy *policy);
667 #else
sugov_is_governor(struct cpufreq_policy * policy)668 static inline bool sugov_is_governor(struct cpufreq_policy *policy)
669 {
670 return false;
671 }
672 #endif
673
cpufreq_policy_apply_limits(struct cpufreq_policy * policy)674 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
675 {
676 if (policy->max < policy->cur)
677 __cpufreq_driver_target(policy, policy->max,
678 CPUFREQ_RELATION_HE);
679 else if (policy->min > policy->cur)
680 __cpufreq_driver_target(policy, policy->min,
681 CPUFREQ_RELATION_LE);
682 }
683
684 /* Governor attribute set */
685 struct gov_attr_set {
686 struct kobject kobj;
687 struct list_head policy_list;
688 struct mutex update_lock;
689 int usage_count;
690 };
691
692 /* sysfs ops for cpufreq governors */
693 extern const struct sysfs_ops governor_sysfs_ops;
694
to_gov_attr_set(struct kobject * kobj)695 static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj)
696 {
697 return container_of(kobj, struct gov_attr_set, kobj);
698 }
699
700 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
701 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
702 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
703
704 /* Governor sysfs attribute */
705 struct governor_attr {
706 struct attribute attr;
707 ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
708 ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
709 size_t count);
710 };
711
712 /*********************************************************************
713 * FREQUENCY TABLE HELPERS *
714 *********************************************************************/
715
716 /* Special Values of .frequency field */
717 #define CPUFREQ_ENTRY_INVALID ~0u
718 #define CPUFREQ_TABLE_END ~1u
719 /* Special Values of .flags field */
720 #define CPUFREQ_BOOST_FREQ (1 << 0)
721 #define CPUFREQ_INEFFICIENT_FREQ (1 << 1)
722
723 struct cpufreq_frequency_table {
724 unsigned int flags;
725 unsigned int driver_data; /* driver specific data, not used by core */
726 unsigned int frequency; /* kHz - doesn't need to be in ascending
727 * order */
728 };
729
730 /*
731 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
732 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
733 * @table: the cpufreq_frequency_table * to iterate over.
734 */
735
736 #define cpufreq_for_each_entry(pos, table) \
737 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
738
739 /*
740 * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
741 * with index
742 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
743 * @table: the cpufreq_frequency_table * to iterate over.
744 * @idx: the table entry currently being processed
745 */
746
747 #define cpufreq_for_each_entry_idx(pos, table, idx) \
748 for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
749 pos++, idx++)
750
751 /*
752 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
753 * excluding CPUFREQ_ENTRY_INVALID frequencies.
754 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
755 * @table: the cpufreq_frequency_table * to iterate over.
756 */
757
758 #define cpufreq_for_each_valid_entry(pos, table) \
759 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
760 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
761 continue; \
762 else
763
764 /*
765 * cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq
766 * frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
767 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
768 * @table: the cpufreq_frequency_table * to iterate over.
769 * @idx: the table entry currently being processed
770 */
771
772 #define cpufreq_for_each_valid_entry_idx(pos, table, idx) \
773 cpufreq_for_each_entry_idx(pos, table, idx) \
774 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
775 continue; \
776 else
777
778 /**
779 * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq
780 * frequency_table excluding CPUFREQ_ENTRY_INVALID and
781 * CPUFREQ_INEFFICIENT_FREQ frequencies.
782 * @pos: the &struct cpufreq_frequency_table to use as a loop cursor.
783 * @table: the &struct cpufreq_frequency_table to iterate over.
784 * @idx: the table entry currently being processed.
785 * @efficiencies: set to true to only iterate over efficient frequencies.
786 */
787
788 #define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) \
789 cpufreq_for_each_valid_entry_idx(pos, table, idx) \
790 if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ)) \
791 continue; \
792 else
793
794
795 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy);
796
797 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy);
798
799 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
800
801 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
802 unsigned int target_freq, unsigned int min,
803 unsigned int max, unsigned int relation);
804 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
805 unsigned int freq);
806
807 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
808
809 #ifdef CONFIG_CPU_FREQ
810 bool cpufreq_boost_enabled(void);
811 int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state);
812
813 /* Find lowest freq at or above target in a table in ascending order */
cpufreq_table_find_index_al(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)814 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
815 unsigned int target_freq,
816 bool efficiencies)
817 {
818 struct cpufreq_frequency_table *table = policy->freq_table;
819 struct cpufreq_frequency_table *pos;
820 unsigned int freq;
821 int idx, best = -1;
822
823 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
824 freq = pos->frequency;
825
826 if (freq >= target_freq)
827 return idx;
828
829 best = idx;
830 }
831
832 return best;
833 }
834
835 /* Find lowest freq at or above target in a table in descending order */
cpufreq_table_find_index_dl(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)836 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
837 unsigned int target_freq,
838 bool efficiencies)
839 {
840 struct cpufreq_frequency_table *table = policy->freq_table;
841 struct cpufreq_frequency_table *pos;
842 unsigned int freq;
843 int idx, best = -1;
844
845 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
846 freq = pos->frequency;
847
848 if (freq == target_freq)
849 return idx;
850
851 if (freq > target_freq) {
852 best = idx;
853 continue;
854 }
855
856 /* No freq found above target_freq */
857 if (best == -1)
858 return idx;
859
860 return best;
861 }
862
863 return best;
864 }
865
find_index_l(struct cpufreq_policy * policy,unsigned int target_freq,unsigned int min,unsigned int max,bool efficiencies)866 static inline int find_index_l(struct cpufreq_policy *policy,
867 unsigned int target_freq,
868 unsigned int min, unsigned int max,
869 bool efficiencies)
870 {
871 target_freq = clamp_val(target_freq, min, max);
872
873 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
874 return cpufreq_table_find_index_al(policy, target_freq,
875 efficiencies);
876 else
877 return cpufreq_table_find_index_dl(policy, target_freq,
878 efficiencies);
879 }
880
881 /* Works only on sorted freq-tables */
cpufreq_table_find_index_l(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)882 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
883 unsigned int target_freq,
884 bool efficiencies)
885 {
886 return find_index_l(policy, target_freq, policy->min, policy->max, efficiencies);
887 }
888
889 /* Find highest freq at or below target in a table in ascending order */
cpufreq_table_find_index_ah(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)890 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
891 unsigned int target_freq,
892 bool efficiencies)
893 {
894 struct cpufreq_frequency_table *table = policy->freq_table;
895 struct cpufreq_frequency_table *pos;
896 unsigned int freq;
897 int idx, best = -1;
898
899 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
900 freq = pos->frequency;
901
902 if (freq == target_freq)
903 return idx;
904
905 if (freq < target_freq) {
906 best = idx;
907 continue;
908 }
909
910 /* No freq found below target_freq */
911 if (best == -1)
912 return idx;
913
914 return best;
915 }
916
917 return best;
918 }
919
920 /* Find highest freq at or below target in a table in descending order */
cpufreq_table_find_index_dh(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)921 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
922 unsigned int target_freq,
923 bool efficiencies)
924 {
925 struct cpufreq_frequency_table *table = policy->freq_table;
926 struct cpufreq_frequency_table *pos;
927 unsigned int freq;
928 int idx, best = -1;
929
930 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
931 freq = pos->frequency;
932
933 if (freq <= target_freq)
934 return idx;
935
936 best = idx;
937 }
938
939 return best;
940 }
941
find_index_h(struct cpufreq_policy * policy,unsigned int target_freq,unsigned int min,unsigned int max,bool efficiencies)942 static inline int find_index_h(struct cpufreq_policy *policy,
943 unsigned int target_freq,
944 unsigned int min, unsigned int max,
945 bool efficiencies)
946 {
947 target_freq = clamp_val(target_freq, min, max);
948
949 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
950 return cpufreq_table_find_index_ah(policy, target_freq,
951 efficiencies);
952 else
953 return cpufreq_table_find_index_dh(policy, target_freq,
954 efficiencies);
955 }
956
957 /* Works only on sorted freq-tables */
cpufreq_table_find_index_h(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)958 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
959 unsigned int target_freq,
960 bool efficiencies)
961 {
962 return find_index_h(policy, target_freq, policy->min, policy->max, efficiencies);
963 }
964
965 /* Find closest freq to target in a table in ascending order */
cpufreq_table_find_index_ac(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)966 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
967 unsigned int target_freq,
968 bool efficiencies)
969 {
970 struct cpufreq_frequency_table *table = policy->freq_table;
971 struct cpufreq_frequency_table *pos;
972 unsigned int freq;
973 int idx, best = -1;
974
975 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
976 freq = pos->frequency;
977
978 if (freq == target_freq)
979 return idx;
980
981 if (freq < target_freq) {
982 best = idx;
983 continue;
984 }
985
986 /* No freq found below target_freq */
987 if (best == -1)
988 return idx;
989
990 /* Choose the closest freq */
991 if (target_freq - table[best].frequency > freq - target_freq)
992 return idx;
993
994 return best;
995 }
996
997 return best;
998 }
999
1000 /* Find closest freq to target in a table in descending order */
cpufreq_table_find_index_dc(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)1001 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
1002 unsigned int target_freq,
1003 bool efficiencies)
1004 {
1005 struct cpufreq_frequency_table *table = policy->freq_table;
1006 struct cpufreq_frequency_table *pos;
1007 unsigned int freq;
1008 int idx, best = -1;
1009
1010 cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
1011 freq = pos->frequency;
1012
1013 if (freq == target_freq)
1014 return idx;
1015
1016 if (freq > target_freq) {
1017 best = idx;
1018 continue;
1019 }
1020
1021 /* No freq found above target_freq */
1022 if (best == -1)
1023 return idx;
1024
1025 /* Choose the closest freq */
1026 if (table[best].frequency - target_freq > target_freq - freq)
1027 return idx;
1028
1029 return best;
1030 }
1031
1032 return best;
1033 }
1034
find_index_c(struct cpufreq_policy * policy,unsigned int target_freq,unsigned int min,unsigned int max,bool efficiencies)1035 static inline int find_index_c(struct cpufreq_policy *policy,
1036 unsigned int target_freq,
1037 unsigned int min, unsigned int max,
1038 bool efficiencies)
1039 {
1040 target_freq = clamp_val(target_freq, min, max);
1041
1042 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
1043 return cpufreq_table_find_index_ac(policy, target_freq,
1044 efficiencies);
1045 else
1046 return cpufreq_table_find_index_dc(policy, target_freq,
1047 efficiencies);
1048 }
1049
1050 /* Works only on sorted freq-tables */
cpufreq_table_find_index_c(struct cpufreq_policy * policy,unsigned int target_freq,bool efficiencies)1051 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
1052 unsigned int target_freq,
1053 bool efficiencies)
1054 {
1055 return find_index_c(policy, target_freq, policy->min, policy->max, efficiencies);
1056 }
1057
cpufreq_is_in_limits(struct cpufreq_policy * policy,unsigned int min,unsigned int max,int idx)1058 static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy,
1059 unsigned int min, unsigned int max,
1060 int idx)
1061 {
1062 unsigned int freq;
1063
1064 if (idx < 0)
1065 return false;
1066
1067 freq = policy->freq_table[idx].frequency;
1068
1069 return freq == clamp_val(freq, min, max);
1070 }
1071
cpufreq_frequency_table_target(struct cpufreq_policy * policy,unsigned int target_freq,unsigned int min,unsigned int max,unsigned int relation)1072 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
1073 unsigned int target_freq,
1074 unsigned int min,
1075 unsigned int max,
1076 unsigned int relation)
1077 {
1078 bool efficiencies = policy->efficiencies_available &&
1079 (relation & CPUFREQ_RELATION_E);
1080 int idx;
1081
1082 /* cpufreq_table_index_unsorted() has no use for this flag anyway */
1083 relation &= ~CPUFREQ_RELATION_E;
1084
1085 if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
1086 return cpufreq_table_index_unsorted(policy, target_freq, min,
1087 max, relation);
1088 retry:
1089 switch (relation) {
1090 case CPUFREQ_RELATION_L:
1091 idx = find_index_l(policy, target_freq, min, max, efficiencies);
1092 break;
1093 case CPUFREQ_RELATION_H:
1094 idx = find_index_h(policy, target_freq, min, max, efficiencies);
1095 break;
1096 case CPUFREQ_RELATION_C:
1097 idx = find_index_c(policy, target_freq, min, max, efficiencies);
1098 break;
1099 default:
1100 WARN_ON_ONCE(1);
1101 return 0;
1102 }
1103
1104 /* Limit frequency index to honor min and max */
1105 if (!cpufreq_is_in_limits(policy, min, max, idx) && efficiencies) {
1106 efficiencies = false;
1107 goto retry;
1108 }
1109
1110 return idx;
1111 }
1112
cpufreq_table_count_valid_entries(const struct cpufreq_policy * policy)1113 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
1114 {
1115 struct cpufreq_frequency_table *pos;
1116 int count = 0;
1117
1118 if (unlikely(!policy->freq_table))
1119 return 0;
1120
1121 cpufreq_for_each_valid_entry(pos, policy->freq_table)
1122 count++;
1123
1124 return count;
1125 }
1126
1127 /**
1128 * cpufreq_table_set_inefficient() - Mark a frequency as inefficient
1129 * @policy: the &struct cpufreq_policy containing the inefficient frequency
1130 * @frequency: the inefficient frequency
1131 *
1132 * The &struct cpufreq_policy must use a sorted frequency table
1133 *
1134 * Return: %0 on success or a negative errno code
1135 */
1136
1137 static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy * policy,unsigned int frequency)1138 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1139 unsigned int frequency)
1140 {
1141 struct cpufreq_frequency_table *pos;
1142
1143 /* Not supported */
1144 if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
1145 return -EINVAL;
1146
1147 cpufreq_for_each_valid_entry(pos, policy->freq_table) {
1148 if (pos->frequency == frequency) {
1149 pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
1150 policy->efficiencies_available = true;
1151 return 0;
1152 }
1153 }
1154
1155 return -EINVAL;
1156 }
1157
parse_perf_domain(int cpu,const char * list_name,const char * cell_name,struct of_phandle_args * args)1158 static inline int parse_perf_domain(int cpu, const char *list_name,
1159 const char *cell_name,
1160 struct of_phandle_args *args)
1161 {
1162 int ret;
1163
1164 struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu);
1165 if (!cpu_np)
1166 return -ENODEV;
1167
1168 ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
1169 args);
1170 if (ret < 0)
1171 return ret;
1172 return 0;
1173 }
1174
of_perf_domain_get_sharing_cpumask(int pcpu,const char * list_name,const char * cell_name,struct cpumask * cpumask,struct of_phandle_args * pargs)1175 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1176 const char *cell_name, struct cpumask *cpumask,
1177 struct of_phandle_args *pargs)
1178 {
1179 int cpu, ret;
1180 struct of_phandle_args args;
1181
1182 ret = parse_perf_domain(pcpu, list_name, cell_name, pargs);
1183 if (ret < 0)
1184 return ret;
1185
1186 cpumask_set_cpu(pcpu, cpumask);
1187
1188 for_each_possible_cpu(cpu) {
1189 if (cpu == pcpu)
1190 continue;
1191
1192 ret = parse_perf_domain(cpu, list_name, cell_name, &args);
1193 if (ret < 0)
1194 continue;
1195
1196 if (of_phandle_args_equal(pargs, &args))
1197 cpumask_set_cpu(cpu, cpumask);
1198
1199 of_node_put(args.np);
1200 }
1201
1202 return 0;
1203 }
1204 #else
cpufreq_boost_enabled(void)1205 static inline bool cpufreq_boost_enabled(void)
1206 {
1207 return false;
1208 }
1209
cpufreq_boost_set_sw(struct cpufreq_policy * policy,int state)1210 static inline int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
1211 {
1212 return -EOPNOTSUPP;
1213 }
1214
1215 static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy * policy,unsigned int frequency)1216 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1217 unsigned int frequency)
1218 {
1219 return -EINVAL;
1220 }
1221
of_perf_domain_get_sharing_cpumask(int pcpu,const char * list_name,const char * cell_name,struct cpumask * cpumask,struct of_phandle_args * pargs)1222 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1223 const char *cell_name, struct cpumask *cpumask,
1224 struct of_phandle_args *pargs)
1225 {
1226 return -EOPNOTSUPP;
1227 }
1228 #endif
1229
1230 extern int arch_freq_get_on_cpu(int cpu);
1231
1232 #ifndef arch_set_freq_scale
1233 static __always_inline
arch_set_freq_scale(const struct cpumask * cpus,unsigned long cur_freq,unsigned long max_freq)1234 void arch_set_freq_scale(const struct cpumask *cpus,
1235 unsigned long cur_freq,
1236 unsigned long max_freq)
1237 {
1238 }
1239 #endif
1240
1241 /* the following are really really optional */
1242 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1243 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1244 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1245
1246 unsigned int cpufreq_generic_get(unsigned int cpu);
1247 void cpufreq_generic_init(struct cpufreq_policy *policy,
1248 struct cpufreq_frequency_table *table,
1249 unsigned int transition_latency);
1250
1251 bool cpufreq_ready_for_eas(const struct cpumask *cpu_mask);
1252
cpufreq_register_em_with_opp(struct cpufreq_policy * policy)1253 static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
1254 {
1255 dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
1256 policy->related_cpus);
1257 }
1258 #endif /* _LINUX_CPUFREQ_H */
1259