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         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 '0' 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 */