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Linux/include/linux/cpufreq.h

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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 accomodating '\n' in prints */
 35 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
 36 
 37 struct cpufreq_governor;
 38 
 39 struct cpufreq_freqs {
 40         unsigned int cpu;       /* cpu nr */
 41         unsigned int old;
 42         unsigned int new;
 43         u8 flags;               /* flags of cpufreq_driver, see below. */
 44 };
 45 
 46 struct cpufreq_cpuinfo {
 47         unsigned int            max_freq;
 48         unsigned int            min_freq;
 49 
 50         /* in 10^(-9) s = nanoseconds */
 51         unsigned int            transition_latency;
 52 };
 53 
 54 struct cpufreq_user_policy {
 55         unsigned int            min;    /* in kHz */
 56         unsigned int            max;    /* in kHz */
 57 };
 58 
 59 struct cpufreq_policy {
 60         /* CPUs sharing clock, require sw coordination */
 61         cpumask_var_t           cpus;   /* Online CPUs only */
 62         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
 63         cpumask_var_t           real_cpus; /* Related and present */
 64 
 65         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
 66                                                 should set cpufreq */
 67         unsigned int            cpu;    /* cpu managing this policy, must be online */
 68 
 69         struct clk              *clk;
 70         struct cpufreq_cpuinfo  cpuinfo;/* see above */
 71 
 72         unsigned int            min;    /* in kHz */
 73         unsigned int            max;    /* in kHz */
 74         unsigned int            cur;    /* in kHz, only needed if cpufreq
 75                                          * governors are used */
 76         unsigned int            restore_freq; /* = policy->cur before transition */
 77         unsigned int            suspend_freq; /* freq to set during suspend */
 78 
 79         unsigned int            policy; /* see above */
 80         unsigned int            last_policy; /* policy before unplug */
 81         struct cpufreq_governor *governor; /* see below */
 82         void                    *governor_data;
 83         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
 84 
 85         struct work_struct      update; /* if update_policy() needs to be
 86                                          * called, but you're in IRQ context */
 87 
 88         struct cpufreq_user_policy user_policy;
 89         struct cpufreq_frequency_table  *freq_table;
 90 
 91         struct list_head        policy_list;
 92         struct kobject          kobj;
 93         struct completion       kobj_unregister;
 94 
 95         /*
 96          * The rules for this semaphore:
 97          * - Any routine that wants to read from the policy structure will
 98          *   do a down_read on this semaphore.
 99          * - Any routine that will write to the policy structure and/or may take away
100          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
101          *   mode before doing so.
102          */
103         struct rw_semaphore     rwsem;
104 
105         /*
106          * Fast switch flags:
107          * - fast_switch_possible should be set by the driver if it can
108          *   guarantee that frequency can be changed on any CPU sharing the
109          *   policy and that the change will affect all of the policy CPUs then.
110          * - fast_switch_enabled is to be set by governors that support fast
111          *   freqnency switching with the help of cpufreq_enable_fast_switch().
112          */
113         bool                    fast_switch_possible;
114         bool                    fast_switch_enabled;
115 
116         /* Synchronization for frequency transitions */
117         bool                    transition_ongoing; /* Tracks transition status */
118         spinlock_t              transition_lock;
119         wait_queue_head_t       transition_wait;
120         struct task_struct      *transition_task; /* Task which is doing the transition */
121 
122         /* cpufreq-stats */
123         struct cpufreq_stats    *stats;
124 
125         /* For cpufreq driver's internal use */
126         void                    *driver_data;
127 };
128 
129 /* Only for ACPI */
130 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
131 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
132 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
133 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
134 
135 #ifdef CONFIG_CPU_FREQ
136 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
137 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
138 void cpufreq_cpu_put(struct cpufreq_policy *policy);
139 #else
140 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
141 {
142         return NULL;
143 }
144 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
145 {
146         return NULL;
147 }
148 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
149 #endif
150 
151 static inline bool policy_is_shared(struct cpufreq_policy *policy)
152 {
153         return cpumask_weight(policy->cpus) > 1;
154 }
155 
156 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
157 extern struct kobject *cpufreq_global_kobject;
158 
159 #ifdef CONFIG_CPU_FREQ
160 unsigned int cpufreq_get(unsigned int cpu);
161 unsigned int cpufreq_quick_get(unsigned int cpu);
162 unsigned int cpufreq_quick_get_max(unsigned int cpu);
163 void disable_cpufreq(void);
164 
165 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
166 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
167 int cpufreq_update_policy(unsigned int cpu);
168 bool have_governor_per_policy(void);
169 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
170 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
171 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
172 #else
173 static inline unsigned int cpufreq_get(unsigned int cpu)
174 {
175         return 0;
176 }
177 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
178 {
179         return 0;
180 }
181 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
182 {
183         return 0;
184 }
185 static inline void disable_cpufreq(void) { }
186 #endif
187 
188 /*********************************************************************
189  *                      CPUFREQ DRIVER INTERFACE                     *
190  *********************************************************************/
191 
192 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
193 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
194 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
195 
196 struct freq_attr {
197         struct attribute attr;
198         ssize_t (*show)(struct cpufreq_policy *, char *);
199         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
200 };
201 
202 #define cpufreq_freq_attr_ro(_name)             \
203 static struct freq_attr _name =                 \
204 __ATTR(_name, 0444, show_##_name, NULL)
205 
206 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
207 static struct freq_attr _name =                 \
208 __ATTR(_name, _perm, show_##_name, NULL)
209 
210 #define cpufreq_freq_attr_rw(_name)             \
211 static struct freq_attr _name =                 \
212 __ATTR(_name, 0644, show_##_name, store_##_name)
213 
214 struct global_attr {
215         struct attribute attr;
216         ssize_t (*show)(struct kobject *kobj,
217                         struct attribute *attr, char *buf);
218         ssize_t (*store)(struct kobject *a, struct attribute *b,
219                          const char *c, size_t count);
220 };
221 
222 #define define_one_global_ro(_name)             \
223 static struct global_attr _name =               \
224 __ATTR(_name, 0444, show_##_name, NULL)
225 
226 #define define_one_global_rw(_name)             \
227 static struct global_attr _name =               \
228 __ATTR(_name, 0644, show_##_name, store_##_name)
229 
230 
231 struct cpufreq_driver {
232         char            name[CPUFREQ_NAME_LEN];
233         u8              flags;
234         void            *driver_data;
235 
236         /* needed by all drivers */
237         int             (*init)(struct cpufreq_policy *policy);
238         int             (*verify)(struct cpufreq_policy *policy);
239 
240         /* define one out of two */
241         int             (*setpolicy)(struct cpufreq_policy *policy);
242 
243         /*
244          * On failure, should always restore frequency to policy->restore_freq
245          * (i.e. old freq).
246          */
247         int             (*target)(struct cpufreq_policy *policy,
248                                   unsigned int target_freq,
249                                   unsigned int relation);       /* Deprecated */
250         int             (*target_index)(struct cpufreq_policy *policy,
251                                         unsigned int index);
252         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
253                                        unsigned int target_freq);
254         /*
255          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
256          * unset.
257          *
258          * get_intermediate should return a stable intermediate frequency
259          * platform wants to switch to and target_intermediate() should set CPU
260          * to to that frequency, before jumping to the frequency corresponding
261          * to 'index'. Core will take care of sending notifications and driver
262          * doesn't have to handle them in target_intermediate() or
263          * target_index().
264          *
265          * Drivers can return '' from get_intermediate() in case they don't
266          * wish to switch to intermediate frequency for some target frequency.
267          * In that case core will directly call ->target_index().
268          */
269         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
270                                             unsigned int index);
271         int             (*target_intermediate)(struct cpufreq_policy *policy,
272                                                unsigned int index);
273 
274         /* should be defined, if possible */
275         unsigned int    (*get)(unsigned int cpu);
276 
277         /* optional */
278         int             (*bios_limit)(int cpu, unsigned int *limit);
279 
280         int             (*exit)(struct cpufreq_policy *policy);
281         void            (*stop_cpu)(struct cpufreq_policy *policy);
282         int             (*suspend)(struct cpufreq_policy *policy);
283         int             (*resume)(struct cpufreq_policy *policy);
284 
285         /* Will be called after the driver is fully initialized */
286         void            (*ready)(struct cpufreq_policy *policy);
287 
288         struct freq_attr **attr;
289 
290         /* platform specific boost support code */
291         bool            boost_enabled;
292         int             (*set_boost)(int state);
293 };
294 
295 /* flags */
296 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
297                                                    all ->init() calls failed */
298 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
299                                                    kernel "constants" aren't
300                                                    affected by frequency
301                                                    transitions */
302 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
303                                                    speed mismatches */
304 
305 /*
306  * This should be set by platforms having multiple clock-domains, i.e.
307  * supporting multiple policies. With this sysfs directories of governor would
308  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
309  * governor with different tunables for different clusters.
310  */
311 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
312 
313 /*
314  * Driver will do POSTCHANGE notifications from outside of their ->target()
315  * routine and so must set cpufreq_driver->flags with this flag, so that core
316  * can handle them specially.
317  */
318 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
319 
320 /*
321  * Set by drivers which want cpufreq core to check if CPU is running at a
322  * frequency present in freq-table exposed by the driver. For these drivers if
323  * CPU is found running at an out of table freq, we will try to set it to a freq
324  * from the table. And if that fails, we will stop further boot process by
325  * issuing a BUG_ON().
326  */
327 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
328 
329 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
330 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
331 
332 const char *cpufreq_get_current_driver(void);
333 void *cpufreq_get_driver_data(void);
334 
335 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
336                 unsigned int min, unsigned int max)
337 {
338         if (policy->min < min)
339                 policy->min = min;
340         if (policy->max < min)
341                 policy->max = min;
342         if (policy->min > max)
343                 policy->min = max;
344         if (policy->max > max)
345                 policy->max = max;
346         if (policy->min > policy->max)
347                 policy->min = policy->max;
348         return;
349 }
350 
351 static inline void
352 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
353 {
354         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
355                         policy->cpuinfo.max_freq);
356 }
357 
358 #ifdef CONFIG_CPU_FREQ
359 void cpufreq_suspend(void);
360 void cpufreq_resume(void);
361 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
362 #else
363 static inline void cpufreq_suspend(void) {}
364 static inline void cpufreq_resume(void) {}
365 #endif
366 
367 /*********************************************************************
368  *                     CPUFREQ NOTIFIER INTERFACE                    *
369  *********************************************************************/
370 
371 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
372 #define CPUFREQ_POLICY_NOTIFIER         (1)
373 
374 /* Transition notifiers */
375 #define CPUFREQ_PRECHANGE               (0)
376 #define CPUFREQ_POSTCHANGE              (1)
377 
378 /* Policy Notifiers  */
379 #define CPUFREQ_ADJUST                  (0)
380 #define CPUFREQ_NOTIFY                  (1)
381 #define CPUFREQ_START                   (2)
382 #define CPUFREQ_CREATE_POLICY           (3)
383 #define CPUFREQ_REMOVE_POLICY           (4)
384 
385 #ifdef CONFIG_CPU_FREQ
386 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
387 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
388 
389 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
390                 struct cpufreq_freqs *freqs);
391 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
392                 struct cpufreq_freqs *freqs, int transition_failed);
393 
394 #else /* CONFIG_CPU_FREQ */
395 static inline int cpufreq_register_notifier(struct notifier_block *nb,
396                                                 unsigned int list)
397 {
398         return 0;
399 }
400 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
401                                                 unsigned int list)
402 {
403         return 0;
404 }
405 #endif /* !CONFIG_CPU_FREQ */
406 
407 /**
408  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
409  * safe)
410  * @old:   old value
411  * @div:   divisor
412  * @mult:  multiplier
413  *
414  *
415  * new = old * mult / div
416  */
417 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
418                 u_int mult)
419 {
420 #if BITS_PER_LONG == 32
421         u64 result = ((u64) old) * ((u64) mult);
422         do_div(result, div);
423         return (unsigned long) result;
424 
425 #elif BITS_PER_LONG == 64
426         unsigned long result = old * ((u64) mult);
427         result /= div;
428         return result;
429 #endif
430 }
431 
432 /*********************************************************************
433  *                          CPUFREQ GOVERNORS                        *
434  *********************************************************************/
435 
436 /*
437  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
438  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
439  * two generic policies are available:
440  */
441 #define CPUFREQ_POLICY_POWERSAVE        (1)
442 #define CPUFREQ_POLICY_PERFORMANCE      (2)
443 
444 /*
445  * The polling frequency depends on the capability of the processor. Default
446  * polling frequency is 1000 times the transition latency of the processor. The
447  * ondemand governor will work on any processor with transition latency <= 10ms,
448  * using appropriate sampling rate.
449  *
450  * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL)
451  * the ondemand governor will not work. All times here are in us (microseconds).
452  */
453 #define MIN_SAMPLING_RATE_RATIO         (2)
454 #define LATENCY_MULTIPLIER              (1000)
455 #define MIN_LATENCY_MULTIPLIER          (20)
456 #define TRANSITION_LATENCY_LIMIT        (10 * 1000 * 1000)
457 
458 /* Governor Events */
459 #define CPUFREQ_GOV_START       1
460 #define CPUFREQ_GOV_STOP        2
461 #define CPUFREQ_GOV_LIMITS      3
462 #define CPUFREQ_GOV_POLICY_INIT 4
463 #define CPUFREQ_GOV_POLICY_EXIT 5
464 
465 struct cpufreq_governor {
466         char    name[CPUFREQ_NAME_LEN];
467         int     initialized;
468         int     (*governor)     (struct cpufreq_policy *policy,
469                                  unsigned int event);
470         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
471                                          char *buf);
472         int     (*store_setspeed)       (struct cpufreq_policy *policy,
473                                          unsigned int freq);
474         unsigned int max_transition_latency; /* HW must be able to switch to
475                         next freq faster than this value in nano secs or we
476                         will fallback to performance governor */
477         struct list_head        governor_list;
478         struct module           *owner;
479 };
480 
481 /* Pass a target to the cpufreq driver */
482 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
483                                         unsigned int target_freq);
484 int cpufreq_driver_target(struct cpufreq_policy *policy,
485                                  unsigned int target_freq,
486                                  unsigned int relation);
487 int __cpufreq_driver_target(struct cpufreq_policy *policy,
488                                    unsigned int target_freq,
489                                    unsigned int relation);
490 int cpufreq_register_governor(struct cpufreq_governor *governor);
491 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
492 
493 struct cpufreq_governor *cpufreq_default_governor(void);
494 struct cpufreq_governor *cpufreq_fallback_governor(void);
495 
496 /* Governor attribute set */
497 struct gov_attr_set {
498         struct kobject kobj;
499         struct list_head policy_list;
500         struct mutex update_lock;
501         int usage_count;
502 };
503 
504 /* sysfs ops for cpufreq governors */
505 extern const struct sysfs_ops governor_sysfs_ops;
506 
507 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
508 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
509 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
510 
511 /* Governor sysfs attribute */
512 struct governor_attr {
513         struct attribute attr;
514         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
515         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
516                          size_t count);
517 };
518 
519 /*********************************************************************
520  *                     FREQUENCY TABLE HELPERS                       *
521  *********************************************************************/
522 
523 /* Special Values of .frequency field */
524 #define CPUFREQ_ENTRY_INVALID   ~0u
525 #define CPUFREQ_TABLE_END       ~1u
526 /* Special Values of .flags field */
527 #define CPUFREQ_BOOST_FREQ      (1 << 0)
528 
529 struct cpufreq_frequency_table {
530         unsigned int    flags;
531         unsigned int    driver_data; /* driver specific data, not used by core */
532         unsigned int    frequency; /* kHz - doesn't need to be in ascending
533                                     * order */
534 };
535 
536 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
537 int dev_pm_opp_init_cpufreq_table(struct device *dev,
538                                   struct cpufreq_frequency_table **table);
539 void dev_pm_opp_free_cpufreq_table(struct device *dev,
540                                    struct cpufreq_frequency_table **table);
541 #else
542 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
543                                                 struct cpufreq_frequency_table
544                                                 **table)
545 {
546         return -EINVAL;
547 }
548 
549 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
550                                                  struct cpufreq_frequency_table
551                                                  **table)
552 {
553 }
554 #endif
555 
556 /*
557  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
558  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
559  * @table:      the cpufreq_frequency_table * to iterate over.
560  */
561 
562 #define cpufreq_for_each_entry(pos, table)      \
563         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
564 
565 /*
566  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
567  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
568  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
569  * @table:      the cpufreq_frequency_table * to iterate over.
570  */
571 
572 #define cpufreq_for_each_valid_entry(pos, table)                        \
573         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
574                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
575                         continue;                                       \
576                 else
577 
578 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
579                                     struct cpufreq_frequency_table *table);
580 
581 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
582                                    struct cpufreq_frequency_table *table);
583 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
584 
585 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
586                                    struct cpufreq_frequency_table *table,
587                                    unsigned int target_freq,
588                                    unsigned int relation,
589                                    unsigned int *index);
590 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
591                 unsigned int freq);
592 
593 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
594 
595 #ifdef CONFIG_CPU_FREQ
596 int cpufreq_boost_trigger_state(int state);
597 int cpufreq_boost_enabled(void);
598 int cpufreq_enable_boost_support(void);
599 bool policy_has_boost_freq(struct cpufreq_policy *policy);
600 #else
601 static inline int cpufreq_boost_trigger_state(int state)
602 {
603         return 0;
604 }
605 static inline int cpufreq_boost_enabled(void)
606 {
607         return 0;
608 }
609 
610 static inline int cpufreq_enable_boost_support(void)
611 {
612         return -EINVAL;
613 }
614 
615 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
616 {
617         return false;
618 }
619 #endif
620 /* the following funtion is for cpufreq core use only */
621 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
622 
623 /* the following are really really optional */
624 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
625 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
626 extern struct freq_attr *cpufreq_generic_attr[];
627 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
628                                       struct cpufreq_frequency_table *table);
629 
630 unsigned int cpufreq_generic_get(unsigned int cpu);
631 int cpufreq_generic_init(struct cpufreq_policy *policy,
632                 struct cpufreq_frequency_table *table,
633                 unsigned int transition_latency);
634 #endif /* _LINUX_CPUFREQ_H */
635 

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