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

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