include/linux/cpufreq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/include/linux/cpufreq.h
   4  *
   5  * Copyright (C) 2001 Russell King
   6  *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
   7  */
   8 #ifndef _LINUX_CPUFREQ_H
   9 #define _LINUX_CPUFREQ_H
  10
  11 #include <linux/clk.h>
  12 #include <linux/cpumask.h>
  13 #include <linux/completion.h>
  14 #include <linux/kobject.h>
  15 #include <linux/notifier.h>
  16 #include <linux/pm_qos.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/sysfs.h>
  19
  20 /*********************************************************************
  21  *                        CPUFREQ INTERFACE                          *
  22  *********************************************************************/
  23 /*
  24  * Frequency values here are CPU kHz
  25  *
  26  * Maximum transition latency is in nanoseconds - if it's unknown,
  27  * CPUFREQ_ETERNAL shall be used.
  28  */
  29
  30 #define CPUFREQ_ETERNAL                 (-1)
  31 #define CPUFREQ_NAME_LEN                16
  32 /* Print length for names. Extra 1 space for accommodating '\n' in prints */
  33 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
  34
  35 struct cpufreq_governor;
  36
  37 enum cpufreq_table_sorting {
  38         CPUFREQ_TABLE_UNSORTED,
  39         CPUFREQ_TABLE_SORTED_ASCENDING,
  40         CPUFREQ_TABLE_SORTED_DESCENDING
  41 };
  42
  43 struct cpufreq_cpuinfo {
  44         unsigned int            max_freq;
  45         unsigned int            min_freq;
  46
  47         /* in 10^(-9) s = nanoseconds */
  48         unsigned int            transition_latency;
  49 };
  50
  51 struct cpufreq_policy {
  52         /* CPUs sharing clock, require sw coordination */
  53         cpumask_var_t           cpus;   /* Online CPUs only */
  54         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
  55         cpumask_var_t           real_cpus; /* Related and present */
  56
  57         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  58                                                 should set cpufreq */
  59         unsigned int            cpu;    /* cpu managing this policy, must be online */
  60
  61         struct clk              *clk;
  62         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  63
  64         unsigned int            min;    /* in kHz */
  65         unsigned int            max;    /* in kHz */
  66         unsigned int            cur;    /* in kHz, only needed if cpufreq
  67                                          * governors are used */
  68         unsigned int            restore_freq; /* = policy->cur before transition */
  69         unsigned int            suspend_freq; /* freq to set during suspend */
  70
  71         unsigned int            policy; /* see above */
  72         unsigned int            last_policy; /* policy before unplug */
  73         struct cpufreq_governor *governor; /* see below */
  74         void                    *governor_data;
  75         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  76
  77         struct work_struct      update; /* if update_policy() needs to be
  78                                          * called, but you're in IRQ context */
  79
  80         struct freq_constraints constraints;
  81         struct freq_qos_request *min_freq_req;
  82         struct freq_qos_request *max_freq_req;
  83
  84         struct cpufreq_frequency_table  *freq_table;
  85         enum cpufreq_table_sorting freq_table_sorted;
  86
  87         struct list_head        policy_list;
  88         struct kobject          kobj;
  89         struct completion       kobj_unregister;
  90
  91         /*
  92          * The rules for this semaphore:
  93          * - Any routine that wants to read from the policy structure will
  94          *   do a down_read on this semaphore.
  95          * - Any routine that will write to the policy structure and/or may take away
  96          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
  97          *   mode before doing so.
  98          */
  99         struct rw_semaphore     rwsem;
 100
 101         /*
 102          * Fast switch flags:
 103          * - fast_switch_possible should be set by the driver if it can
 104          *   guarantee that frequency can be changed on any CPU sharing the
 105          *   policy and that the change will affect all of the policy CPUs then.
 106          * - fast_switch_enabled is to be set by governors that support fast
 107          *   frequency switching with the help of cpufreq_enable_fast_switch().
 108          */
 109         bool                    fast_switch_possible;
 110         bool                    fast_switch_enabled;
 111
 112         /*
 113          * Preferred average time interval between consecutive invocations of
 114          * the driver to set the frequency for this policy.  To be set by the
 115          * scaling driver (0, which is the default, means no preference).
 116          */
 117         unsigned int            transition_delay_us;
 118
 119         /*
 120          * Remote DVFS flag (Not added to the driver structure as we don't want
 121          * to access another structure from scheduler hotpath).
 122          *
 123          * Should be set if CPUs can do DVFS on behalf of other CPUs from
 124          * different cpufreq policies.
 125          */
 126         bool                    dvfs_possible_from_any_cpu;
 127
 128          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 129         unsigned int cached_target_freq;
 130         unsigned int cached_resolved_idx;
 131
 132         /* Synchronization for frequency transitions */
 133         bool                    transition_ongoing; /* Tracks transition status */
 134         spinlock_t              transition_lock;
 135         wait_queue_head_t       transition_wait;
 136         struct task_struct      *transition_task; /* Task which is doing the transition */
 137
 138         /* cpufreq-stats */
 139         struct cpufreq_stats    *stats;
 140
 141         /* For cpufreq driver's internal use */
 142         void                    *driver_data;
 143
 144         /* Pointer to the cooling device if used for thermal mitigation */
 145         struct thermal_cooling_device *cdev;
 146
 147         struct notifier_block nb_min;
 148         struct notifier_block nb_max;
 149 };
 150
 151 /*
 152  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 153  * callback for sanitization.  That callback is only expected to modify the min
 154  * and max values, if necessary, and specifically it must not update the
 155  * frequency table.
 156  */
 157 struct cpufreq_policy_data {
 158         struct cpufreq_cpuinfo          cpuinfo;
 159         struct cpufreq_frequency_table  *freq_table;
 160         unsigned int                    cpu;
 161         unsigned int                    min;    /* in kHz */
 162         unsigned int                    max;    /* in kHz */
 163 };
 164
 165 struct cpufreq_freqs {
 166         struct cpufreq_policy *policy;
 167         unsigned int old;
 168         unsigned int new;
 169         u8 flags;               /* flags of cpufreq_driver, see below. */
 170 };
 171
 172 /* Only for ACPI */
 173 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 174 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 175 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 176 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 177
 178 #ifdef CONFIG_CPU_FREQ
 179 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 180 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 181 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 182 #else
 183 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 184 {
 185         return NULL;
 186 }
 187 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 188 {
 189         return NULL;
 190 }
 191 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 192 #endif
 193
 194 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 195 {
 196         return cpumask_empty(policy->cpus);
 197 }
 198
 199 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 200 {
 201         return cpumask_weight(policy->cpus) > 1;
 202 }
 203
 204 #ifdef CONFIG_CPU_FREQ
 205 unsigned int cpufreq_get(unsigned int cpu);
 206 unsigned int cpufreq_quick_get(unsigned int cpu);
 207 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 208 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 209 void disable_cpufreq(void);
 210
 211 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 212
 213 struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
 214 void cpufreq_cpu_release(struct cpufreq_policy *policy);
 215 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 216 void refresh_frequency_limits(struct cpufreq_policy *policy);
 217 void cpufreq_update_policy(unsigned int cpu);
 218 void cpufreq_update_limits(unsigned int cpu);
 219 bool have_governor_per_policy(void);
 220 bool cpufreq_supports_freq_invariance(void);
 221 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 222 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 223 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 224 #else
 225 static inline unsigned int cpufreq_get(unsigned int cpu)
 226 {
 227         return 0;
 228 }
 229 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 230 {
 231         return 0;
 232 }
 233 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 234 {
 235         return 0;
 236 }
 237 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 238 {
 239         return 0;
 240 }
 241 static inline bool cpufreq_supports_freq_invariance(void)
 242 {
 243         return false;
 244 }
 245 static inline void disable_cpufreq(void) { }
 246 #endif
 247
 248 #ifdef CONFIG_CPU_FREQ_STAT
 249 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 250 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 251 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 252                                      unsigned int new_freq);
 253 #else
 254 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 255 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 256 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 257                                                    unsigned int new_freq) { }
 258 #endif /* CONFIG_CPU_FREQ_STAT */
 259
 260 /*********************************************************************
 261  *                      CPUFREQ DRIVER INTERFACE                     *
 262  *********************************************************************/
 263
 264 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 265 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 266 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 267
 268 struct freq_attr {
 269         struct attribute attr;
 270         ssize_t (*show)(struct cpufreq_policy *, char *);
 271         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 272 };
 273
 274 #define cpufreq_freq_attr_ro(_name)             \
 275 static struct freq_attr _name =                 \
 276 __ATTR(_name, 0444, show_##_name, NULL)
 277
 278 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 279 static struct freq_attr _name =                 \
 280 __ATTR(_name, _perm, show_##_name, NULL)
 281
 282 #define cpufreq_freq_attr_rw(_name)             \
 283 static struct freq_attr _name =                 \
 284 __ATTR(_name, 0644, show_##_name, store_##_name)
 285
 286 #define cpufreq_freq_attr_wo(_name)             \
 287 static struct freq_attr _name =                 \
 288 __ATTR(_name, 0200, NULL, store_##_name)
 289
 290 #define define_one_global_ro(_name)             \
 291 static struct kobj_attribute _name =            \
 292 __ATTR(_name, 0444, show_##_name, NULL)
 293
 294 #define define_one_global_rw(_name)             \
 295 static struct kobj_attribute _name =            \
 296 __ATTR(_name, 0644, show_##_name, store_##_name)
 297
 298
 299 struct cpufreq_driver {
 300         char            name[CPUFREQ_NAME_LEN];
 301         u16             flags;
 302         void            *driver_data;
 303
 304         /* needed by all drivers */
 305         int             (*init)(struct cpufreq_policy *policy);
 306         int             (*verify)(struct cpufreq_policy_data *policy);
 307
 308         /* define one out of two */
 309         int             (*setpolicy)(struct cpufreq_policy *policy);
 310
 311         /*
 312          * On failure, should always restore frequency to policy->restore_freq
 313          * (i.e. old freq).
 314          */
 315         int             (*target)(struct cpufreq_policy *policy,
 316                                   unsigned int target_freq,
 317                                   unsigned int relation);       /* Deprecated */
 318         int             (*target_index)(struct cpufreq_policy *policy,
 319                                         unsigned int index);
 320         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 321                                        unsigned int target_freq);
 322
 323         /*
 324          * Caches and returns the lowest driver-supported frequency greater than
 325          * or equal to the target frequency, subject to any driver limitations.
 326          * Does not set the frequency. Only to be implemented for drivers with
 327          * target().
 328          */
 329         unsigned int    (*resolve_freq)(struct cpufreq_policy *policy,
 330                                         unsigned int target_freq);
 331
 332         /*
 333          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 334          * unset.
 335          *
 336          * get_intermediate should return a stable intermediate frequency
 337          * platform wants to switch to and target_intermediate() should set CPU
 338          * to that frequency, before jumping to the frequency corresponding
 339          * to 'index'. Core will take care of sending notifications and driver
 340          * doesn't have to handle them in target_intermediate() or
 341          * target_index().
 342          *
 343          * Drivers can return '0' from get_intermediate() in case they don't
 344          * wish to switch to intermediate frequency for some target frequency.
 345          * In that case core will directly call ->target_index().
 346          */
 347         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 348                                             unsigned int index);
 349         int             (*target_intermediate)(struct cpufreq_policy *policy,
 350                                                unsigned int index);
 351
 352         /* should be defined, if possible */
 353         unsigned int    (*get)(unsigned int cpu);
 354
 355         /* Called to update policy limits on firmware notifications. */
 356         void            (*update_limits)(unsigned int cpu);
 357
 358         /* optional */
 359         int             (*bios_limit)(int cpu, unsigned int *limit);
 360
 361         int             (*online)(struct cpufreq_policy *policy);
 362         int             (*offline)(struct cpufreq_policy *policy);
 363         int             (*exit)(struct cpufreq_policy *policy);
 364         void            (*stop_cpu)(struct cpufreq_policy *policy);
 365         int             (*suspend)(struct cpufreq_policy *policy);
 366         int             (*resume)(struct cpufreq_policy *policy);
 367
 368         /* Will be called after the driver is fully initialized */
 369         void            (*ready)(struct cpufreq_policy *policy);
 370
 371         struct freq_attr **attr;
 372
 373         /* platform specific boost support code */
 374         bool            boost_enabled;
 375         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 376 };
 377
 378 /* flags */
 379
 380 /* driver isn't removed even if all ->init() calls failed */
 381 #define CPUFREQ_STICKY                          BIT(0)
 382
 383 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 384 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 385
 386 /* don't warn on suspend/resume speed mismatches */
 387 #define CPUFREQ_PM_NO_WARN                      BIT(2)
 388
 389 /*
 390  * This should be set by platforms having multiple clock-domains, i.e.
 391  * supporting multiple policies. With this sysfs directories of governor would
 392  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 393  * governor with different tunables for different clusters.
 394  */
 395 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 396
 397 /*
 398  * Driver will do POSTCHANGE notifications from outside of their ->target()
 399  * routine and so must set cpufreq_driver->flags with this flag, so that core
 400  * can handle them specially.
 401  */
 402 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 403
 404 /*
 405  * Set by drivers which want cpufreq core to check if CPU is running at a
 406  * frequency present in freq-table exposed by the driver. For these drivers if
 407  * CPU is found running at an out of table freq, we will try to set it to a freq
 408  * from the table. And if that fails, we will stop further boot process by
 409  * issuing a BUG_ON().
 410  */
 411 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 412
 413 /*
 414  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 415  * set.
 416  */
 417 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 418
 419 /*
 420  * Set by drivers that want the core to automatically register the cpufreq
 421  * driver as a thermal cooling device.
 422  */
 423 #define CPUFREQ_IS_COOLING_DEV                  BIT(7)
 424
 425 /*
 426  * Set by drivers that need to update internale upper and lower boundaries along
 427  * with the target frequency and so the core and governors should also invoke
 428  * the diver if the target frequency does not change, but the policy min or max
 429  * may have changed.
 430  */
 431 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(8)
 432
 433 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 434 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 435
 436 bool cpufreq_driver_test_flags(u16 flags);
 437 const char *cpufreq_get_current_driver(void);
 438 void *cpufreq_get_driver_data(void);
 439
 440 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 441 {
 442         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 443                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 444 }
 445
 446 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 447                                                 unsigned int min,
 448                                                 unsigned int max)
 449 {
 450         if (policy->min < min)
 451                 policy->min = min;
 452         if (policy->max < min)
 453                 policy->max = min;
 454         if (policy->min > max)
 455                 policy->min = max;
 456         if (policy->max > max)
 457                 policy->max = max;
 458         if (policy->min > policy->max)
 459                 policy->min = policy->max;
 460         return;
 461 }
 462
 463 static inline void
 464 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 465 {
 466         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 467                                      policy->cpuinfo.max_freq);
 468 }
 469
 470 #ifdef CONFIG_CPU_FREQ
 471 void cpufreq_suspend(void);
 472 void cpufreq_resume(void);
 473 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 474 #else
 475 static inline void cpufreq_suspend(void) {}
 476 static inline void cpufreq_resume(void) {}
 477 #endif
 478
 479 /*********************************************************************
 480  *                     CPUFREQ NOTIFIER INTERFACE                    *
 481  *********************************************************************/
 482
 483 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 484 #define CPUFREQ_POLICY_NOTIFIER         (1)
 485
 486 /* Transition notifiers */
 487 #define CPUFREQ_PRECHANGE               (0)
 488 #define CPUFREQ_POSTCHANGE              (1)
 489
 490 /* Policy Notifiers  */
 491 #define CPUFREQ_CREATE_POLICY           (0)
 492 #define CPUFREQ_REMOVE_POLICY           (1)
 493
 494 #ifdef CONFIG_CPU_FREQ
 495 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 496 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 497
 498 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 499                 struct cpufreq_freqs *freqs);
 500 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 501                 struct cpufreq_freqs *freqs, int transition_failed);
 502
 503 #else /* CONFIG_CPU_FREQ */
 504 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 505                                                 unsigned int list)
 506 {
 507         return 0;
 508 }
 509 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 510                                                 unsigned int list)
 511 {
 512         return 0;
 513 }
 514 #endif /* !CONFIG_CPU_FREQ */
 515
 516 /**
 517  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 518  * safe)
 519  * @old:   old value
 520  * @div:   divisor
 521  * @mult:  multiplier
 522  *
 523  *
 524  * new = old * mult / div
 525  */
 526 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 527                 u_int mult)
 528 {
 529 #if BITS_PER_LONG == 32
 530         u64 result = ((u64) old) * ((u64) mult);
 531         do_div(result, div);
 532         return (unsigned long) result;
 533
 534 #elif BITS_PER_LONG == 64
 535         unsigned long result = old * ((u64) mult);
 536         result /= div;
 537         return result;
 538 #endif
 539 }
 540
 541 /*********************************************************************
 542  *                          CPUFREQ GOVERNORS                        *
 543  *********************************************************************/
 544
 545 #define CPUFREQ_POLICY_UNKNOWN          (0)
 546 /*
 547  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 548  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 549  * two generic policies are available:
 550  */
 551 #define CPUFREQ_POLICY_POWERSAVE        (1)
 552 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 553
 554 /*
 555  * The polling frequency depends on the capability of the processor. Default
 556  * polling frequency is 1000 times the transition latency of the processor. The
 557  * ondemand governor will work on any processor with transition latency <= 10ms,
 558  * using appropriate sampling rate.
 559  */
 560 #define LATENCY_MULTIPLIER              (1000)
 561
 562 struct cpufreq_governor {
 563         char    name[CPUFREQ_NAME_LEN];
 564         int     (*init)(struct cpufreq_policy *policy);
 565         void    (*exit)(struct cpufreq_policy *policy);
 566         int     (*start)(struct cpufreq_policy *policy);
 567         void    (*stop)(struct cpufreq_policy *policy);
 568         void    (*limits)(struct cpufreq_policy *policy);
 569         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 570                                          char *buf);
 571         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 572                                          unsigned int freq);
 573         /* For governors which change frequency dynamically by themselves */
 574         bool                    dynamic_switching;
 575         struct list_head        governor_list;
 576         struct module           *owner;
 577 };
 578
 579 /* Pass a target to the cpufreq driver */
 580 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 581                                         unsigned int target_freq);
 582 int cpufreq_driver_target(struct cpufreq_policy *policy,
 583                                  unsigned int target_freq,
 584                                  unsigned int relation);
 585 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 586                                    unsigned int target_freq,
 587                                    unsigned int relation);
 588 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 589                                          unsigned int target_freq);
 590 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 591 int cpufreq_register_governor(struct cpufreq_governor *governor);
 592 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 593 int cpufreq_start_governor(struct cpufreq_policy *policy);
 594 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 595
 596 #define cpufreq_governor_init(__governor)                       \
 597 static int __init __governor##_init(void)                       \
 598 {                                                               \
 599         return cpufreq_register_governor(&__governor);  \
 600 }                                                               \
 601 core_initcall(__governor##_init)
 602
 603 #define cpufreq_governor_exit(__governor)                       \
 604 static void __exit __governor##_exit(void)                      \
 605 {                                                               \
 606         return cpufreq_unregister_governor(&__governor);        \
 607 }                                                               \
 608 module_exit(__governor##_exit)
 609
 610 struct cpufreq_governor *cpufreq_default_governor(void);
 611 struct cpufreq_governor *cpufreq_fallback_governor(void);
 612
 613 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 614 {
 615         if (policy->max < policy->cur)
 616                 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
 617         else if (policy->min > policy->cur)
 618                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
 619 }
 620
 621 /* Governor attribute set */
 622 struct gov_attr_set {
 623         struct kobject kobj;
 624         struct list_head policy_list;
 625         struct mutex update_lock;
 626         int usage_count;
 627 };
 628
 629 /* sysfs ops for cpufreq governors */
 630 extern const struct sysfs_ops governor_sysfs_ops;
 631
 632 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 633 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 634 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 635
 636 /* Governor sysfs attribute */
 637 struct governor_attr {
 638         struct attribute attr;
 639         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 640         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 641                          size_t count);
 642 };
 643
 644 /*********************************************************************
 645  *                     FREQUENCY TABLE HELPERS                       *
 646  *********************************************************************/
 647
 648 /* Special Values of .frequency field */
 649 #define CPUFREQ_ENTRY_INVALID   ~0u
 650 #define CPUFREQ_TABLE_END       ~1u
 651 /* Special Values of .flags field */
 652 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 653
 654 struct cpufreq_frequency_table {
 655         unsigned int    flags;
 656         unsigned int    driver_data; /* driver specific data, not used by core */
 657         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 658                                     * order */
 659 };
 660
 661 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 662 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 663                                   struct cpufreq_frequency_table **table);
 664 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 665                                    struct cpufreq_frequency_table **table);
 666 #else
 667 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 668                                                 struct cpufreq_frequency_table
 669                                                 **table)
 670 {
 671         return -EINVAL;
 672 }
 673
 674 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 675                                                  struct cpufreq_frequency_table
 676                                                  **table)
 677 {
 678 }
 679 #endif
 680
 681 /*
 682  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 683  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 684  * @table:      the cpufreq_frequency_table * to iterate over.
 685  */
 686
 687 #define cpufreq_for_each_entry(pos, table)      \
 688         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 689
 690 /*
 691  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 692  *      with index
 693  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 694  * @table:      the cpufreq_frequency_table * to iterate over.
 695  * @idx:        the table entry currently being processed
 696  */
 697
 698 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 699         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 700                 pos++, idx++)
 701
 702 /*
 703  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 704  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 705  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 706  * @table:      the cpufreq_frequency_table * to iterate over.
 707  */
 708
 709 #define cpufreq_for_each_valid_entry(pos, table)                        \
 710         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 711                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 712                         continue;                                       \
 713                 else
 714
 715 /*
 716  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 717  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 718  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 719  * @table:      the cpufreq_frequency_table * to iterate over.
 720  * @idx:        the table entry currently being processed
 721  */
 722
 723 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 724         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 725                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 726                         continue;                                       \
 727                 else
 728
 729
 730 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 731                                     struct cpufreq_frequency_table *table);
 732
 733 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 734                                    struct cpufreq_frequency_table *table);
 735 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 736
 737 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 738                                  unsigned int target_freq,
 739                                  unsigned int relation);
 740 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 741                 unsigned int freq);
 742
 743 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 744
 745 #ifdef CONFIG_CPU_FREQ
 746 int cpufreq_boost_trigger_state(int state);
 747 int cpufreq_boost_enabled(void);
 748 int cpufreq_enable_boost_support(void);
 749 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 750
 751 /* Find lowest freq at or above target in a table in ascending order */
 752 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 753                                               unsigned int target_freq)
 754 {
 755         struct cpufreq_frequency_table *table = policy->freq_table;
 756         struct cpufreq_frequency_table *pos;
 757         unsigned int freq;
 758         int idx, best = -1;
 759
 760         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 761                 freq = pos->frequency;
 762
 763                 if (freq >= target_freq)
 764                         return idx;
 765
 766                 best = idx;
 767         }
 768
 769         return best;
 770 }
 771
 772 /* Find lowest freq at or above target in a table in descending order */
 773 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 774                                               unsigned int target_freq)
 775 {
 776         struct cpufreq_frequency_table *table = policy->freq_table;
 777         struct cpufreq_frequency_table *pos;
 778         unsigned int freq;
 779         int idx, best = -1;
 780
 781         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 782                 freq = pos->frequency;
 783
 784                 if (freq == target_freq)
 785                         return idx;
 786
 787                 if (freq > target_freq) {
 788                         best = idx;
 789                         continue;
 790                 }
 791
 792                 /* No freq found above target_freq */
 793                 if (best == -1)
 794                         return idx;
 795
 796                 return best;
 797         }
 798
 799         return best;
 800 }
 801
 802 /* Works only on sorted freq-tables */
 803 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 804                                              unsigned int target_freq)
 805 {
 806         target_freq = clamp_val(target_freq, policy->min, policy->max);
 807
 808         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 809                 return cpufreq_table_find_index_al(policy, target_freq);
 810         else
 811                 return cpufreq_table_find_index_dl(policy, target_freq);
 812 }
 813
 814 /* Find highest freq at or below target in a table in ascending order */
 815 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 816                                               unsigned int target_freq)
 817 {
 818         struct cpufreq_frequency_table *table = policy->freq_table;
 819         struct cpufreq_frequency_table *pos;
 820         unsigned int freq;
 821         int idx, best = -1;
 822
 823         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 824                 freq = pos->frequency;
 825
 826                 if (freq == target_freq)
 827                         return idx;
 828
 829                 if (freq < target_freq) {
 830                         best = idx;
 831                         continue;
 832                 }
 833
 834                 /* No freq found below target_freq */
 835                 if (best == -1)
 836                         return idx;
 837
 838                 return best;
 839         }
 840
 841         return best;
 842 }
 843
 844 /* Find highest freq at or below target in a table in descending order */
 845 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 846                                               unsigned int target_freq)
 847 {
 848         struct cpufreq_frequency_table *table = policy->freq_table;
 849         struct cpufreq_frequency_table *pos;
 850         unsigned int freq;
 851         int idx, best = -1;
 852
 853         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 854                 freq = pos->frequency;
 855
 856                 if (freq <= target_freq)
 857                         return idx;
 858
 859                 best = idx;
 860         }
 861
 862         return best;
 863 }
 864
 865 /* Works only on sorted freq-tables */
 866 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 867                                              unsigned int target_freq)
 868 {
 869         target_freq = clamp_val(target_freq, policy->min, policy->max);
 870
 871         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 872                 return cpufreq_table_find_index_ah(policy, target_freq);
 873         else
 874                 return cpufreq_table_find_index_dh(policy, target_freq);
 875 }
 876
 877 /* Find closest freq to target in a table in ascending order */
 878 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 879                                               unsigned int target_freq)
 880 {
 881         struct cpufreq_frequency_table *table = policy->freq_table;
 882         struct cpufreq_frequency_table *pos;
 883         unsigned int freq;
 884         int idx, best = -1;
 885
 886         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 887                 freq = pos->frequency;
 888
 889                 if (freq == target_freq)
 890                         return idx;
 891
 892                 if (freq < target_freq) {
 893                         best = idx;
 894                         continue;
 895                 }
 896
 897                 /* No freq found below target_freq */
 898                 if (best == -1)
 899                         return idx;
 900
 901                 /* Choose the closest freq */
 902                 if (target_freq - table[best].frequency > freq - target_freq)
 903                         return idx;
 904
 905                 return best;
 906         }
 907
 908         return best;
 909 }
 910
 911 /* Find closest freq to target in a table in descending order */
 912 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 913                                               unsigned int target_freq)
 914 {
 915         struct cpufreq_frequency_table *table = policy->freq_table;
 916         struct cpufreq_frequency_table *pos;
 917         unsigned int freq;
 918         int idx, best = -1;
 919
 920         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 921                 freq = pos->frequency;
 922
 923                 if (freq == target_freq)
 924                         return idx;
 925
 926                 if (freq > target_freq) {
 927                         best = idx;
 928                         continue;
 929                 }
 930
 931                 /* No freq found above target_freq */
 932                 if (best == -1)
 933                         return idx;
 934
 935                 /* Choose the closest freq */
 936                 if (table[best].frequency - target_freq > target_freq - freq)
 937                         return idx;
 938
 939                 return best;
 940         }
 941
 942         return best;
 943 }
 944
 945 /* Works only on sorted freq-tables */
 946 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
 947                                              unsigned int target_freq)
 948 {
 949         target_freq = clamp_val(target_freq, policy->min, policy->max);
 950
 951         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 952                 return cpufreq_table_find_index_ac(policy, target_freq);
 953         else
 954                 return cpufreq_table_find_index_dc(policy, target_freq);
 955 }
 956
 957 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 958                                                  unsigned int target_freq,
 959                                                  unsigned int relation)
 960 {
 961         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
 962                 return cpufreq_table_index_unsorted(policy, target_freq,
 963                                                     relation);
 964
 965         switch (relation) {
 966         case CPUFREQ_RELATION_L:
 967                 return cpufreq_table_find_index_l(policy, target_freq);
 968         case CPUFREQ_RELATION_H:
 969                 return cpufreq_table_find_index_h(policy, target_freq);
 970         case CPUFREQ_RELATION_C:
 971                 return cpufreq_table_find_index_c(policy, target_freq);
 972         default:
 973                 WARN_ON_ONCE(1);
 974                 return 0;
 975         }
 976 }
 977
 978 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
 979 {
 980         struct cpufreq_frequency_table *pos;
 981         int count = 0;
 982
 983         if (unlikely(!policy->freq_table))
 984                 return 0;
 985
 986         cpufreq_for_each_valid_entry(pos, policy->freq_table)
 987                 count++;
 988
 989         return count;
 990 }
 991 #else
 992 static inline int cpufreq_boost_trigger_state(int state)
 993 {
 994         return 0;
 995 }
 996 static inline int cpufreq_boost_enabled(void)
 997 {
 998         return 0;
 999 }
1000
1001 static inline int cpufreq_enable_boost_support(void)
1002 {
1003         return -EINVAL;
1004 }
1005
1006 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1007 {
1008         return false;
1009 }
1010 #endif
1011
1012 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1013 void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1014                         struct cpufreq_governor *old_gov);
1015 #else
1016 static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1017                         struct cpufreq_governor *old_gov) { }
1018 #endif
1019
1020 extern void arch_freq_prepare_all(void);
1021 extern unsigned int arch_freq_get_on_cpu(int cpu);
1022
1023 #ifndef arch_set_freq_scale
1024 static __always_inline
1025 void arch_set_freq_scale(const struct cpumask *cpus,
1026                          unsigned long cur_freq,
1027                          unsigned long max_freq)
1028 {
1029 }
1030 #endif
1031
1032 /* the following are really really optional */
1033 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1034 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1035 extern struct freq_attr *cpufreq_generic_attr[];
1036 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1037
1038 unsigned int cpufreq_generic_get(unsigned int cpu);
1039 void cpufreq_generic_init(struct cpufreq_policy *policy,
1040                 struct cpufreq_frequency_table *table,
1041                 unsigned int transition_latency);
1042 #endif /* _LINUX_CPUFREQ_H */