include/linux/cpufreq.h

   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         struct rw_semaphore     rwsem;
 105
 106         /* Synchronization for frequency transitions */
 107         bool                    transition_ongoing; /* Tracks transition status */
 108         spinlock_t              transition_lock;
 109         wait_queue_head_t       transition_wait;
 110         struct task_struct      *transition_task; /* Task which is doing the transition */
 111
 112         /* cpufreq-stats */
 113         struct cpufreq_stats    *stats;
 114
 115         /* For cpufreq driver's internal use */
 116         void                    *driver_data;
 117 };
 118
 119 /* Only for ACPI */
 120 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 121 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 122 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 123 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 124
 125 #ifdef CONFIG_CPU_FREQ
 126 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 127 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 128 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 129 #else
 130 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 131 {
 132         return NULL;
 133 }
 134 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 135 {
 136         return NULL;
 137 }
 138 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 139 #endif
 140
 141 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 142 {
 143         return cpumask_weight(policy->cpus) > 1;
 144 }
 145
 146 /* /sys/devices/system/cpu/cpufreq: entry point for global variables */
 147 extern struct kobject *cpufreq_global_kobject;
 148
 149 #ifdef CONFIG_CPU_FREQ
 150 void cpufreq_update_util(u64 time, unsigned long util, unsigned long max);
 151
 152 /**
 153  * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed.
 154  * @time: Current time.
 155  *
 156  * The way cpufreq is currently arranged requires it to evaluate the CPU
 157  * performance state (frequency/voltage) on a regular basis to prevent it from
 158  * being stuck in a completely inadequate performance level for too long.
 159  * That is not guaranteed to happen if the updates are only triggered from CFS,
 160  * though, because they may not be coming in if RT or deadline tasks are active
 161  * all the time (or there are RT and DL tasks only).
 162  *
 163  * As a workaround for that issue, this function is called by the RT and DL
 164  * sched classes to trigger extra cpufreq updates to prevent it from stalling,
 165  * but that really is a band-aid.  Going forward it should be replaced with
 166  * solutions targeted more specifically at RT and DL tasks.
 167  */
 168 static inline void cpufreq_trigger_update(u64 time)
 169 {
 170         cpufreq_update_util(time, ULONG_MAX, 0);
 171 }
 172
 173 struct update_util_data {
 174         void (*func)(struct update_util_data *data,
 175                      u64 time, unsigned long util, unsigned long max);
 176 };
 177
 178 void cpufreq_set_update_util_data(int cpu, struct update_util_data *data);
 179
 180 unsigned int cpufreq_get(unsigned int cpu);
 181 unsigned int cpufreq_quick_get(unsigned int cpu);
 182 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 183 void disable_cpufreq(void);
 184
 185 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 186 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 187 int cpufreq_update_policy(unsigned int cpu);
 188 bool have_governor_per_policy(void);
 189 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 190 #else
 191 static inline void cpufreq_update_util(u64 time, unsigned long util,
 192                                        unsigned long max) {}
 193 static inline void cpufreq_trigger_update(u64 time) {}
 194
 195 static inline unsigned int cpufreq_get(unsigned int cpu)
 196 {
 197         return 0;
 198 }
 199 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 200 {
 201         return 0;
 202 }
 203 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 204 {
 205         return 0;
 206 }
 207 static inline void disable_cpufreq(void) { }
 208 #endif
 209
 210 /*********************************************************************
 211  *                      CPUFREQ DRIVER INTERFACE                     *
 212  *********************************************************************/
 213
 214 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 215 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 216 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 217
 218 struct freq_attr {
 219         struct attribute attr;
 220         ssize_t (*show)(struct cpufreq_policy *, char *);
 221         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 222 };
 223
 224 #define cpufreq_freq_attr_ro(_name)             \
 225 static struct freq_attr _name =                 \
 226 __ATTR(_name, 0444, show_##_name, NULL)
 227
 228 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 229 static struct freq_attr _name =                 \
 230 __ATTR(_name, _perm, show_##_name, NULL)
 231
 232 #define cpufreq_freq_attr_rw(_name)             \
 233 static struct freq_attr _name =                 \
 234 __ATTR(_name, 0644, show_##_name, store_##_name)
 235
 236 struct global_attr {
 237         struct attribute attr;
 238         ssize_t (*show)(struct kobject *kobj,
 239                         struct attribute *attr, char *buf);
 240         ssize_t (*store)(struct kobject *a, struct attribute *b,
 241                          const char *c, size_t count);
 242 };
 243
 244 #define define_one_global_ro(_name)             \
 245 static struct global_attr _name =               \
 246 __ATTR(_name, 0444, show_##_name, NULL)
 247
 248 #define define_one_global_rw(_name)             \
 249 static struct global_attr _name =               \
 250 __ATTR(_name, 0644, show_##_name, store_##_name)
 251
 252
 253 struct cpufreq_driver {
 254         char            name[CPUFREQ_NAME_LEN];
 255         u8              flags;
 256         void            *driver_data;
 257
 258         /* needed by all drivers */
 259         int             (*init)(struct cpufreq_policy *policy);
 260         int             (*verify)(struct cpufreq_policy *policy);
 261
 262         /* define one out of two */
 263         int             (*setpolicy)(struct cpufreq_policy *policy);
 264
 265         /*
 266          * On failure, should always restore frequency to policy->restore_freq
 267          * (i.e. old freq).
 268          */
 269         int             (*target)(struct cpufreq_policy *policy,
 270                                   unsigned int target_freq,
 271                                   unsigned int relation);       /* Deprecated */
 272         int             (*target_index)(struct cpufreq_policy *policy,
 273                                         unsigned int index);
 274         /*
 275          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 276          * unset.
 277          *
 278          * get_intermediate should return a stable intermediate frequency
 279          * platform wants to switch to and target_intermediate() should set CPU
 280          * to to that frequency, before jumping to the frequency corresponding
 281          * to 'index'. Core will take care of sending notifications and driver
 282          * doesn't have to handle them in target_intermediate() or
 283          * target_index().
 284          *
 285          * Drivers can return '0' from get_intermediate() in case they don't
 286          * wish to switch to intermediate frequency for some target frequency.
 287          * In that case core will directly call ->target_index().
 288          */
 289         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 290                                             unsigned int index);
 291         int             (*target_intermediate)(struct cpufreq_policy *policy,
 292                                                unsigned int index);
 293
 294         /* should be defined, if possible */
 295         unsigned int    (*get)(unsigned int cpu);
 296
 297         /* optional */
 298         int             (*bios_limit)(int cpu, unsigned int *limit);
 299
 300         int             (*exit)(struct cpufreq_policy *policy);
 301         void            (*stop_cpu)(struct cpufreq_policy *policy);
 302         int             (*suspend)(struct cpufreq_policy *policy);
 303         int             (*resume)(struct cpufreq_policy *policy);
 304
 305         /* Will be called after the driver is fully initialized */
 306         void            (*ready)(struct cpufreq_policy *policy);
 307
 308         struct freq_attr **attr;
 309
 310         /* platform specific boost support code */
 311         bool            boost_enabled;
 312         int             (*set_boost)(int state);
 313 };
 314
 315 /* flags */
 316 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
 317                                                    all ->init() calls failed */
 318 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
 319                                                    kernel "constants" aren't
 320                                                    affected by frequency
 321                                                    transitions */
 322 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
 323                                                    speed mismatches */
 324
 325 /*
 326  * This should be set by platforms having multiple clock-domains, i.e.
 327  * supporting multiple policies. With this sysfs directories of governor would
 328  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 329  * governor with different tunables for different clusters.
 330  */
 331 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
 332
 333 /*
 334  * Driver will do POSTCHANGE notifications from outside of their ->target()
 335  * routine and so must set cpufreq_driver->flags with this flag, so that core
 336  * can handle them specially.
 337  */
 338 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 339
 340 /*
 341  * Set by drivers which want cpufreq core to check if CPU is running at a
 342  * frequency present in freq-table exposed by the driver. For these drivers if
 343  * CPU is found running at an out of table freq, we will try to set it to a freq
 344  * from the table. And if that fails, we will stop further boot process by
 345  * issuing a BUG_ON().
 346  */
 347 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
 348
 349 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 350 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 351
 352 const char *cpufreq_get_current_driver(void);
 353 void *cpufreq_get_driver_data(void);
 354
 355 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 356                 unsigned int min, unsigned int max)
 357 {
 358         if (policy->min < min)
 359                 policy->min = min;
 360         if (policy->max < min)
 361                 policy->max = min;
 362         if (policy->min > max)
 363                 policy->min = max;
 364         if (policy->max > max)
 365                 policy->max = max;
 366         if (policy->min > policy->max)
 367                 policy->min = policy->max;
 368         return;
 369 }
 370
 371 static inline void
 372 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 373 {
 374         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 375                         policy->cpuinfo.max_freq);
 376 }
 377
 378 #ifdef CONFIG_CPU_FREQ
 379 void cpufreq_suspend(void);
 380 void cpufreq_resume(void);
 381 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 382 #else
 383 static inline void cpufreq_suspend(void) {}
 384 static inline void cpufreq_resume(void) {}
 385 #endif
 386
 387 /*********************************************************************
 388  *                     CPUFREQ NOTIFIER INTERFACE                    *
 389  *********************************************************************/
 390
 391 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 392 #define CPUFREQ_POLICY_NOTIFIER         (1)
 393
 394 /* Transition notifiers */
 395 #define CPUFREQ_PRECHANGE               (0)
 396 #define CPUFREQ_POSTCHANGE              (1)
 397
 398 /* Policy Notifiers  */
 399 #define CPUFREQ_ADJUST                  (0)
 400 #define CPUFREQ_NOTIFY                  (1)
 401 #define CPUFREQ_START                   (2)
 402 #define CPUFREQ_CREATE_POLICY           (3)
 403 #define CPUFREQ_REMOVE_POLICY           (4)
 404
 405 #ifdef CONFIG_CPU_FREQ
 406 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 407 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 408
 409 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 410                 struct cpufreq_freqs *freqs);
 411 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 412                 struct cpufreq_freqs *freqs, int transition_failed);
 413
 414 #else /* CONFIG_CPU_FREQ */
 415 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 416                                                 unsigned int list)
 417 {
 418         return 0;
 419 }
 420 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 421                                                 unsigned int list)
 422 {
 423         return 0;
 424 }
 425 #endif /* !CONFIG_CPU_FREQ */
 426
 427 /**
 428  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 429  * safe)
 430  * @old:   old value
 431  * @div:   divisor
 432  * @mult:  multiplier
 433  *
 434  *
 435  * new = old * mult / div
 436  */
 437 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 438                 u_int mult)
 439 {
 440 #if BITS_PER_LONG == 32
 441         u64 result = ((u64) old) * ((u64) mult);
 442         do_div(result, div);
 443         return (unsigned long) result;
 444
 445 #elif BITS_PER_LONG == 64
 446         unsigned long result = old * ((u64) mult);
 447         result /= div;
 448         return result;
 449 #endif
 450 }
 451
 452 /*********************************************************************
 453  *                          CPUFREQ GOVERNORS                        *
 454  *********************************************************************/
 455
 456 /*
 457  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 458  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 459  * two generic policies are available:
 460  */
 461 #define CPUFREQ_POLICY_POWERSAVE        (1)
 462 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 463
 464 /* Governor Events */
 465 #define CPUFREQ_GOV_START       1
 466 #define CPUFREQ_GOV_STOP        2
 467 #define CPUFREQ_GOV_LIMITS      3
 468 #define CPUFREQ_GOV_POLICY_INIT 4
 469 #define CPUFREQ_GOV_POLICY_EXIT 5
 470
 471 struct cpufreq_governor {
 472         char    name[CPUFREQ_NAME_LEN];
 473         int     initialized;
 474         int     (*governor)     (struct cpufreq_policy *policy,
 475                                  unsigned int event);
 476         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 477                                          char *buf);
 478         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 479                                          unsigned int freq);
 480         unsigned int max_transition_latency; /* HW must be able to switch to
 481                         next freq faster than this value in nano secs or we
 482                         will fallback to performance governor */
 483         struct list_head        governor_list;
 484         struct module           *owner;
 485 };
 486
 487 /* Pass a target to the cpufreq driver */
 488 int cpufreq_driver_target(struct cpufreq_policy *policy,
 489                                  unsigned int target_freq,
 490                                  unsigned int relation);
 491 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 492                                    unsigned int target_freq,
 493                                    unsigned int relation);
 494 int cpufreq_register_governor(struct cpufreq_governor *governor);
 495 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 496
 497 struct cpufreq_governor *cpufreq_default_governor(void);
 498 struct cpufreq_governor *cpufreq_fallback_governor(void);
 499
 500 /*********************************************************************
 501  *                     FREQUENCY TABLE HELPERS                       *
 502  *********************************************************************/
 503
 504 /* Special Values of .frequency field */
 505 #define CPUFREQ_ENTRY_INVALID   ~0u
 506 #define CPUFREQ_TABLE_END       ~1u
 507 /* Special Values of .flags field */
 508 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 509
 510 struct cpufreq_frequency_table {
 511         unsigned int    flags;
 512         unsigned int    driver_data; /* driver specific data, not used by core */
 513         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 514                                     * order */
 515 };
 516
 517 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 518 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 519                                   struct cpufreq_frequency_table **table);
 520 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 521                                    struct cpufreq_frequency_table **table);
 522 #else
 523 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 524                                                 struct cpufreq_frequency_table
 525                                                 **table)
 526 {
 527         return -EINVAL;
 528 }
 529
 530 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 531                                                  struct cpufreq_frequency_table
 532                                                  **table)
 533 {
 534 }
 535 #endif
 536
 537 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
 538 {
 539         while ((*pos)->frequency != CPUFREQ_TABLE_END)
 540                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
 541                         return true;
 542                 else
 543                         (*pos)++;
 544         return false;
 545 }
 546
 547 /*
 548  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 549  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 550  * @table:      the cpufreq_frequency_table * to iterate over.
 551  */
 552
 553 #define cpufreq_for_each_entry(pos, table)      \
 554         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 555
 556 /*
 557  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 558  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 559  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 560  * @table:      the cpufreq_frequency_table * to iterate over.
 561  */
 562
 563 #define cpufreq_for_each_valid_entry(pos, table)        \
 564         for (pos = table; cpufreq_next_valid(&pos); pos++)
 565
 566 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 567                                     struct cpufreq_frequency_table *table);
 568
 569 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 570                                    struct cpufreq_frequency_table *table);
 571 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 572
 573 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 574                                    struct cpufreq_frequency_table *table,
 575                                    unsigned int target_freq,
 576                                    unsigned int relation,
 577                                    unsigned int *index);
 578 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 579                 unsigned int freq);
 580
 581 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 582
 583 #ifdef CONFIG_CPU_FREQ
 584 int cpufreq_boost_trigger_state(int state);
 585 int cpufreq_boost_enabled(void);
 586 int cpufreq_enable_boost_support(void);
 587 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 588 #else
 589 static inline int cpufreq_boost_trigger_state(int state)
 590 {
 591         return 0;
 592 }
 593 static inline int cpufreq_boost_enabled(void)
 594 {
 595         return 0;
 596 }
 597
 598 static inline int cpufreq_enable_boost_support(void)
 599 {
 600         return -EINVAL;
 601 }
 602
 603 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
 604 {
 605         return false;
 606 }
 607 #endif
 608 /* the following funtion is for cpufreq core use only */
 609 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 610
 611 /* the following are really really optional */
 612 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 613 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
 614 extern struct freq_attr *cpufreq_generic_attr[];
 615 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
 616                                       struct cpufreq_frequency_table *table);
 617
 618 unsigned int cpufreq_generic_get(unsigned int cpu);
 619 int cpufreq_generic_init(struct cpufreq_policy *policy,
 620                 struct cpufreq_frequency_table *table,
 621                 unsigned int transition_latency);
 622 #endif /* _LINUX_CPUFREQ_H */