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         unsigned int            kobj_cpu; /* cpu managing sysfs files, can be offline */
  69
  70         struct clk              *clk;
  71         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  72
  73         unsigned int            min;    /* in kHz */
  74         unsigned int            max;    /* in kHz */
  75         unsigned int            cur;    /* in kHz, only needed if cpufreq
  76                                          * governors are used */
  77         unsigned int            restore_freq; /* = policy->cur before transition */
  78         unsigned int            suspend_freq; /* freq to set during suspend */
  79
  80         unsigned int            policy; /* see above */
  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 int cpufreq_get_global_kobject(void);
 153 void cpufreq_put_global_kobject(void);
 154 int cpufreq_sysfs_create_file(const struct attribute *attr);
 155 void cpufreq_sysfs_remove_file(const struct attribute *attr);
 156
 157 #ifdef CONFIG_CPU_FREQ
 158 unsigned int cpufreq_get(unsigned int cpu);
 159 unsigned int cpufreq_quick_get(unsigned int cpu);
 160 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 161 void disable_cpufreq(void);
 162
 163 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 164 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 165 int cpufreq_update_policy(unsigned int cpu);
 166 bool have_governor_per_policy(void);
 167 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 168 #else
 169 static inline unsigned int cpufreq_get(unsigned int cpu)
 170 {
 171         return 0;
 172 }
 173 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 174 {
 175         return 0;
 176 }
 177 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 178 {
 179         return 0;
 180 }
 181 static inline void disable_cpufreq(void) { }
 182 #endif
 183
 184 /*********************************************************************
 185  *                      CPUFREQ DRIVER INTERFACE                     *
 186  *********************************************************************/
 187
 188 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 189 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 190 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 191
 192 struct freq_attr {
 193         struct attribute attr;
 194         ssize_t (*show)(struct cpufreq_policy *, char *);
 195         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 196 };
 197
 198 #define cpufreq_freq_attr_ro(_name)             \
 199 static struct freq_attr _name =                 \
 200 __ATTR(_name, 0444, show_##_name, NULL)
 201
 202 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 203 static struct freq_attr _name =                 \
 204 __ATTR(_name, _perm, show_##_name, NULL)
 205
 206 #define cpufreq_freq_attr_rw(_name)             \
 207 static struct freq_attr _name =                 \
 208 __ATTR(_name, 0644, show_##_name, store_##_name)
 209
 210 struct global_attr {
 211         struct attribute attr;
 212         ssize_t (*show)(struct kobject *kobj,
 213                         struct attribute *attr, char *buf);
 214         ssize_t (*store)(struct kobject *a, struct attribute *b,
 215                          const char *c, size_t count);
 216 };
 217
 218 #define define_one_global_ro(_name)             \
 219 static struct global_attr _name =               \
 220 __ATTR(_name, 0444, show_##_name, NULL)
 221
 222 #define define_one_global_rw(_name)             \
 223 static struct global_attr _name =               \
 224 __ATTR(_name, 0644, show_##_name, store_##_name)
 225
 226
 227 struct cpufreq_driver {
 228         char            name[CPUFREQ_NAME_LEN];
 229         u8              flags;
 230         void            *driver_data;
 231
 232         /* needed by all drivers */
 233         int             (*init)(struct cpufreq_policy *policy);
 234         int             (*verify)(struct cpufreq_policy *policy);
 235
 236         /* define one out of two */
 237         int             (*setpolicy)(struct cpufreq_policy *policy);
 238
 239         /*
 240          * On failure, should always restore frequency to policy->restore_freq
 241          * (i.e. old freq).
 242          */
 243         int             (*target)(struct cpufreq_policy *policy,
 244                                   unsigned int target_freq,
 245                                   unsigned int relation);       /* Deprecated */
 246         int             (*target_index)(struct cpufreq_policy *policy,
 247                                         unsigned int index);
 248         /*
 249          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 250          * unset.
 251          *
 252          * get_intermediate should return a stable intermediate frequency
 253          * platform wants to switch to and target_intermediate() should set CPU
 254          * to to that frequency, before jumping to the frequency corresponding
 255          * to 'index'. Core will take care of sending notifications and driver
 256          * doesn't have to handle them in target_intermediate() or
 257          * target_index().
 258          *
 259          * Drivers can return '0' from get_intermediate() in case they don't
 260          * wish to switch to intermediate frequency for some target frequency.
 261          * In that case core will directly call ->target_index().
 262          */
 263         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 264                                             unsigned int index);
 265         int             (*target_intermediate)(struct cpufreq_policy *policy,
 266                                                unsigned int index);
 267
 268         /* should be defined, if possible */
 269         unsigned int    (*get)(unsigned int cpu);
 270
 271         /* optional */
 272         int             (*bios_limit)(int cpu, unsigned int *limit);
 273
 274         int             (*exit)(struct cpufreq_policy *policy);
 275         void            (*stop_cpu)(struct cpufreq_policy *policy);
 276         int             (*suspend)(struct cpufreq_policy *policy);
 277         int             (*resume)(struct cpufreq_policy *policy);
 278
 279         /* Will be called after the driver is fully initialized */
 280         void            (*ready)(struct cpufreq_policy *policy);
 281
 282         struct freq_attr **attr;
 283
 284         /* platform specific boost support code */
 285         bool            boost_supported;
 286         bool            boost_enabled;
 287         int             (*set_boost)(int state);
 288 };
 289
 290 /* flags */
 291 #define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
 292                                                    all ->init() calls failed */
 293 #define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
 294                                                    kernel "constants" aren't
 295                                                    affected by frequency
 296                                                    transitions */
 297 #define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
 298                                                    speed mismatches */
 299
 300 /*
 301  * This should be set by platforms having multiple clock-domains, i.e.
 302  * supporting multiple policies. With this sysfs directories of governor would
 303  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 304  * governor with different tunables for different clusters.
 305  */
 306 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
 307
 308 /*
 309  * Driver will do POSTCHANGE notifications from outside of their ->target()
 310  * routine and so must set cpufreq_driver->flags with this flag, so that core
 311  * can handle them specially.
 312  */
 313 #define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 314
 315 /*
 316  * Set by drivers which want cpufreq core to check if CPU is running at a
 317  * frequency present in freq-table exposed by the driver. For these drivers if
 318  * CPU is found running at an out of table freq, we will try to set it to a freq
 319  * from the table. And if that fails, we will stop further boot process by
 320  * issuing a BUG_ON().
 321  */
 322 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
 323
 324 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 325 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 326
 327 const char *cpufreq_get_current_driver(void);
 328 void *cpufreq_get_driver_data(void);
 329
 330 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 331                 unsigned int min, unsigned int max)
 332 {
 333         if (policy->min < min)
 334                 policy->min = min;
 335         if (policy->max < min)
 336                 policy->max = min;
 337         if (policy->min > max)
 338                 policy->min = max;
 339         if (policy->max > max)
 340                 policy->max = max;
 341         if (policy->min > policy->max)
 342                 policy->min = policy->max;
 343         return;
 344 }
 345
 346 static inline void
 347 cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
 348 {
 349         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 350                         policy->cpuinfo.max_freq);
 351 }
 352
 353 #ifdef CONFIG_CPU_FREQ
 354 void cpufreq_suspend(void);
 355 void cpufreq_resume(void);
 356 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 357 #else
 358 static inline void cpufreq_suspend(void) {}
 359 static inline void cpufreq_resume(void) {}
 360 #endif
 361
 362 /*********************************************************************
 363  *                     CPUFREQ NOTIFIER INTERFACE                    *
 364  *********************************************************************/
 365
 366 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 367 #define CPUFREQ_POLICY_NOTIFIER         (1)
 368
 369 /* Transition notifiers */
 370 #define CPUFREQ_PRECHANGE               (0)
 371 #define CPUFREQ_POSTCHANGE              (1)
 372
 373 /* Policy Notifiers  */
 374 #define CPUFREQ_ADJUST                  (0)
 375 #define CPUFREQ_NOTIFY                  (1)
 376 #define CPUFREQ_START                   (2)
 377 #define CPUFREQ_CREATE_POLICY           (3)
 378 #define CPUFREQ_REMOVE_POLICY           (4)
 379
 380 #ifdef CONFIG_CPU_FREQ
 381 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 382 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 383
 384 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 385                 struct cpufreq_freqs *freqs);
 386 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 387                 struct cpufreq_freqs *freqs, int transition_failed);
 388
 389 #else /* CONFIG_CPU_FREQ */
 390 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 391                                                 unsigned int list)
 392 {
 393         return 0;
 394 }
 395 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 396                                                 unsigned int list)
 397 {
 398         return 0;
 399 }
 400 #endif /* !CONFIG_CPU_FREQ */
 401
 402 /**
 403  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 404  * safe)
 405  * @old:   old value
 406  * @div:   divisor
 407  * @mult:  multiplier
 408  *
 409  *
 410  * new = old * mult / div
 411  */
 412 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 413                 u_int mult)
 414 {
 415 #if BITS_PER_LONG == 32
 416         u64 result = ((u64) old) * ((u64) mult);
 417         do_div(result, div);
 418         return (unsigned long) result;
 419
 420 #elif BITS_PER_LONG == 64
 421         unsigned long result = old * ((u64) mult);
 422         result /= div;
 423         return result;
 424 #endif
 425 }
 426
 427 /*********************************************************************
 428  *                          CPUFREQ GOVERNORS                        *
 429  *********************************************************************/
 430
 431 /*
 432  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 433  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 434  * two generic policies are available:
 435  */
 436 #define CPUFREQ_POLICY_POWERSAVE        (1)
 437 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 438
 439 /* Governor Events */
 440 #define CPUFREQ_GOV_START       1
 441 #define CPUFREQ_GOV_STOP        2
 442 #define CPUFREQ_GOV_LIMITS      3
 443 #define CPUFREQ_GOV_POLICY_INIT 4
 444 #define CPUFREQ_GOV_POLICY_EXIT 5
 445
 446 struct cpufreq_governor {
 447         char    name[CPUFREQ_NAME_LEN];
 448         int     initialized;
 449         int     (*governor)     (struct cpufreq_policy *policy,
 450                                  unsigned int event);
 451         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 452                                          char *buf);
 453         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 454                                          unsigned int freq);
 455         unsigned int max_transition_latency; /* HW must be able to switch to
 456                         next freq faster than this value in nano secs or we
 457                         will fallback to performance governor */
 458         struct list_head        governor_list;
 459         struct module           *owner;
 460 };
 461
 462 /* Pass a target to the cpufreq driver */
 463 int cpufreq_driver_target(struct cpufreq_policy *policy,
 464                                  unsigned int target_freq,
 465                                  unsigned int relation);
 466 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 467                                    unsigned int target_freq,
 468                                    unsigned int relation);
 469 int cpufreq_register_governor(struct cpufreq_governor *governor);
 470 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 471
 472 /* CPUFREQ DEFAULT GOVERNOR */
 473 /*
 474  * Performance governor is fallback governor if any other gov failed to auto
 475  * load due latency restrictions
 476  */
 477 #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE
 478 extern struct cpufreq_governor cpufreq_gov_performance;
 479 #endif
 480 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 481 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_performance)
 482 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
 483 extern struct cpufreq_governor cpufreq_gov_powersave;
 484 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_powersave)
 485 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 486 extern struct cpufreq_governor cpufreq_gov_userspace;
 487 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_userspace)
 488 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
 489 extern struct cpufreq_governor cpufreq_gov_ondemand;
 490 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_ondemand)
 491 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE)
 492 extern struct cpufreq_governor cpufreq_gov_conservative;
 493 #define CPUFREQ_DEFAULT_GOVERNOR        (&cpufreq_gov_conservative)
 494 #endif
 495
 496 /*********************************************************************
 497  *                     FREQUENCY TABLE HELPERS                       *
 498  *********************************************************************/
 499
 500 /* Special Values of .frequency field */
 501 #define CPUFREQ_ENTRY_INVALID   ~0u
 502 #define CPUFREQ_TABLE_END       ~1u
 503 /* Special Values of .flags field */
 504 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 505
 506 struct cpufreq_frequency_table {
 507         unsigned int    flags;
 508         unsigned int    driver_data; /* driver specific data, not used by core */
 509         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 510                                     * order */
 511 };
 512
 513 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 514 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 515                                   struct cpufreq_frequency_table **table);
 516 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 517                                    struct cpufreq_frequency_table **table);
 518 #else
 519 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 520                                                 struct cpufreq_frequency_table
 521                                                 **table)
 522 {
 523         return -EINVAL;
 524 }
 525
 526 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 527                                                  struct cpufreq_frequency_table
 528                                                  **table)
 529 {
 530 }
 531 #endif
 532
 533 static inline bool cpufreq_next_valid(struct cpufreq_frequency_table **pos)
 534 {
 535         while ((*pos)->frequency != CPUFREQ_TABLE_END)
 536                 if ((*pos)->frequency != CPUFREQ_ENTRY_INVALID)
 537                         return true;
 538                 else
 539                         (*pos)++;
 540         return false;
 541 }
 542
 543 /*
 544  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 545  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 546  * @table:      the cpufreq_frequency_table * to iterate over.
 547  */
 548
 549 #define cpufreq_for_each_entry(pos, table)      \
 550         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 551
 552 /*
 553  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 554  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 555  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 556  * @table:      the cpufreq_frequency_table * to iterate over.
 557  */
 558
 559 #define cpufreq_for_each_valid_entry(pos, table)        \
 560         for (pos = table; cpufreq_next_valid(&pos); pos++)
 561
 562 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 563                                     struct cpufreq_frequency_table *table);
 564
 565 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
 566                                    struct cpufreq_frequency_table *table);
 567 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 568
 569 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 570                                    struct cpufreq_frequency_table *table,
 571                                    unsigned int target_freq,
 572                                    unsigned int relation,
 573                                    unsigned int *index);
 574 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 575                 unsigned int freq);
 576
 577 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 578
 579 #ifdef CONFIG_CPU_FREQ
 580 int cpufreq_boost_trigger_state(int state);
 581 int cpufreq_boost_supported(void);
 582 int cpufreq_boost_enabled(void);
 583 int cpufreq_enable_boost_support(void);
 584 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 585 #else
 586 static inline int cpufreq_boost_trigger_state(int state)
 587 {
 588         return 0;
 589 }
 590 static inline int cpufreq_boost_supported(void)
 591 {
 592         return 0;
 593 }
 594 static inline int cpufreq_boost_enabled(void)
 595 {
 596         return 0;
 597 }
 598
 599 static inline int cpufreq_enable_boost_support(void)
 600 {
 601         return -EINVAL;
 602 }
 603
 604 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
 605 {
 606         return false;
 607 }
 608 #endif
 609 /* the following funtion is for cpufreq core use only */
 610 struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 611
 612 /* the following are really really optional */
 613 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
 614 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
 615 extern struct freq_attr *cpufreq_generic_attr[];
 616 int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
 617                                       struct cpufreq_frequency_table *table);
 618
 619 unsigned int cpufreq_generic_get(unsigned int cpu);
 620 int cpufreq_generic_init(struct cpufreq_policy *policy,
 621                 struct cpufreq_frequency_table *table,
 622                 unsigned int transition_latency);
 623 #endif /* _LINUX_CPUFREQ_H */