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 <[email protected]>
   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            suspend_freq; /* freq to set during suspend */
  69
  70         unsigned int            policy; /* see above */
  71         unsigned int            last_policy; /* policy before unplug */
  72         struct cpufreq_governor *governor; /* see below */
  73         void                    *governor_data;
  74         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  75
  76         struct work_struct      update; /* if update_policy() needs to be
  77                                          * called, but you're in IRQ context */
  78
  79         struct freq_constraints constraints;
  80         struct freq_qos_request *min_freq_req;
  81         struct freq_qos_request *max_freq_req;
  82
  83         struct cpufreq_frequency_table  *freq_table;
  84         enum cpufreq_table_sorting freq_table_sorted;
  85
  86         struct list_head        policy_list;
  87         struct kobject          kobj;
  88         struct completion       kobj_unregister;
  89
  90         /*
  91          * The rules for this semaphore:
  92          * - Any routine that wants to read from the policy structure will
  93          *   do a down_read on this semaphore.
  94          * - Any routine that will write to the policy structure and/or may take away
  95          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
  96          *   mode before doing so.
  97          */
  98         struct rw_semaphore     rwsem;
  99
 100         /*
 101          * Fast switch flags:
 102          * - fast_switch_possible should be set by the driver if it can
 103          *   guarantee that frequency can be changed on any CPU sharing the
 104          *   policy and that the change will affect all of the policy CPUs then.
 105          * - fast_switch_enabled is to be set by governors that support fast
 106          *   frequency switching with the help of cpufreq_enable_fast_switch().
 107          */
 108         bool                    fast_switch_possible;
 109         bool                    fast_switch_enabled;
 110
 111         /*
 112          * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
 113          * governor.
 114          */
 115         bool                    strict_target;
 116
 117         /*
 118          * Preferred average time interval between consecutive invocations of
 119          * the driver to set the frequency for this policy.  To be set by the
 120          * scaling driver (0, which is the default, means no preference).
 121          */
 122         unsigned int            transition_delay_us;
 123
 124         /*
 125          * Remote DVFS flag (Not added to the driver structure as we don't want
 126          * to access another structure from scheduler hotpath).
 127          *
 128          * Should be set if CPUs can do DVFS on behalf of other CPUs from
 129          * different cpufreq policies.
 130          */
 131         bool                    dvfs_possible_from_any_cpu;
 132
 133          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 134         unsigned int cached_target_freq;
 135         unsigned int cached_resolved_idx;
 136
 137         /* Synchronization for frequency transitions */
 138         bool                    transition_ongoing; /* Tracks transition status */
 139         spinlock_t              transition_lock;
 140         wait_queue_head_t       transition_wait;
 141         struct task_struct      *transition_task; /* Task which is doing the transition */
 142
 143         /* cpufreq-stats */
 144         struct cpufreq_stats    *stats;
 145
 146         /* For cpufreq driver's internal use */
 147         void                    *driver_data;
 148
 149         /* Pointer to the cooling device if used for thermal mitigation */
 150         struct thermal_cooling_device *cdev;
 151
 152         struct notifier_block nb_min;
 153         struct notifier_block nb_max;
 154 };
 155
 156 /*
 157  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 158  * callback for sanitization.  That callback is only expected to modify the min
 159  * and max values, if necessary, and specifically it must not update the
 160  * frequency table.
 161  */
 162 struct cpufreq_policy_data {
 163         struct cpufreq_cpuinfo          cpuinfo;
 164         struct cpufreq_frequency_table  *freq_table;
 165         unsigned int                    cpu;
 166         unsigned int                    min;    /* in kHz */
 167         unsigned int                    max;    /* in kHz */
 168 };
 169
 170 struct cpufreq_freqs {
 171         struct cpufreq_policy *policy;
 172         unsigned int old;
 173         unsigned int new;
 174         u8 flags;               /* flags of cpufreq_driver, see below. */
 175 };
 176
 177 /* Only for ACPI */
 178 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 179 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 180 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 181 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 182
 183 #ifdef CONFIG_CPU_FREQ
 184 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 185 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 186 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 187 #else
 188 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 189 {
 190         return NULL;
 191 }
 192 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 193 {
 194         return NULL;
 195 }
 196 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 197 #endif
 198
 199 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 200 {
 201         return cpumask_empty(policy->cpus);
 202 }
 203
 204 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 205 {
 206         return cpumask_weight(policy->cpus) > 1;
 207 }
 208
 209 #ifdef CONFIG_CPU_FREQ
 210 unsigned int cpufreq_get(unsigned int cpu);
 211 unsigned int cpufreq_quick_get(unsigned int cpu);
 212 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 213 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 214 void disable_cpufreq(void);
 215
 216 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 217
 218 struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
 219 void cpufreq_cpu_release(struct cpufreq_policy *policy);
 220 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 221 void refresh_frequency_limits(struct cpufreq_policy *policy);
 222 void cpufreq_update_policy(unsigned int cpu);
 223 void cpufreq_update_limits(unsigned int cpu);
 224 bool have_governor_per_policy(void);
 225 bool cpufreq_supports_freq_invariance(void);
 226 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 227 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 228 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 229 #else
 230 static inline unsigned int cpufreq_get(unsigned int cpu)
 231 {
 232         return 0;
 233 }
 234 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 235 {
 236         return 0;
 237 }
 238 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 239 {
 240         return 0;
 241 }
 242 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 243 {
 244         return 0;
 245 }
 246 static inline bool cpufreq_supports_freq_invariance(void)
 247 {
 248         return false;
 249 }
 250 static inline void disable_cpufreq(void) { }
 251 #endif
 252
 253 #ifdef CONFIG_CPU_FREQ_STAT
 254 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 255 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 256 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 257                                      unsigned int new_freq);
 258 #else
 259 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 260 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 261 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 262                                                    unsigned int new_freq) { }
 263 #endif /* CONFIG_CPU_FREQ_STAT */
 264
 265 /*********************************************************************
 266  *                      CPUFREQ DRIVER INTERFACE                     *
 267  *********************************************************************/
 268
 269 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 270 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 271 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 272
 273 struct freq_attr {
 274         struct attribute attr;
 275         ssize_t (*show)(struct cpufreq_policy *, char *);
 276         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 277 };
 278
 279 #define cpufreq_freq_attr_ro(_name)             \
 280 static struct freq_attr _name =                 \
 281 __ATTR(_name, 0444, show_##_name, NULL)
 282
 283 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 284 static struct freq_attr _name =                 \
 285 __ATTR(_name, _perm, show_##_name, NULL)
 286
 287 #define cpufreq_freq_attr_rw(_name)             \
 288 static struct freq_attr _name =                 \
 289 __ATTR(_name, 0644, show_##_name, store_##_name)
 290
 291 #define cpufreq_freq_attr_wo(_name)             \
 292 static struct freq_attr _name =                 \
 293 __ATTR(_name, 0200, NULL, store_##_name)
 294
 295 #define define_one_global_ro(_name)             \
 296 static struct kobj_attribute _name =            \
 297 __ATTR(_name, 0444, show_##_name, NULL)
 298
 299 #define define_one_global_rw(_name)             \
 300 static struct kobj_attribute _name =            \
 301 __ATTR(_name, 0644, show_##_name, store_##_name)
 302
 303
 304 struct cpufreq_driver {
 305         char            name[CPUFREQ_NAME_LEN];
 306         u16             flags;
 307         void            *driver_data;
 308
 309         /* needed by all drivers */
 310         int             (*init)(struct cpufreq_policy *policy);
 311         int             (*verify)(struct cpufreq_policy_data *policy);
 312
 313         /* define one out of two */
 314         int             (*setpolicy)(struct cpufreq_policy *policy);
 315
 316         int             (*target)(struct cpufreq_policy *policy,
 317                                   unsigned int target_freq,
 318                                   unsigned int relation);       /* Deprecated */
 319         int             (*target_index)(struct cpufreq_policy *policy,
 320                                         unsigned int index);
 321         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 322                                        unsigned int target_freq);
 323         /*
 324          * ->fast_switch() replacement for drivers that use an internal
 325          * representation of performance levels and can pass hints other than
 326          * the target performance level to the hardware.
 327          */
 328         void            (*adjust_perf)(unsigned int cpu,
 329                                        unsigned long min_perf,
 330                                        unsigned long target_perf,
 331                                        unsigned long capacity);
 332
 333         /*
 334          * Caches and returns the lowest driver-supported frequency greater than
 335          * or equal to the target frequency, subject to any driver limitations.
 336          * Does not set the frequency. Only to be implemented for drivers with
 337          * target().
 338          */
 339         unsigned int    (*resolve_freq)(struct cpufreq_policy *policy,
 340                                         unsigned int target_freq);
 341
 342         /*
 343          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 344          * unset.
 345          *
 346          * get_intermediate should return a stable intermediate frequency
 347          * platform wants to switch to and target_intermediate() should set CPU
 348          * to that frequency, before jumping to the frequency corresponding
 349          * to 'index'. Core will take care of sending notifications and driver
 350          * doesn't have to handle them in target_intermediate() or
 351          * target_index().
 352          *
 353          * Drivers can return '0' from get_intermediate() in case they don't
 354          * wish to switch to intermediate frequency for some target frequency.
 355          * In that case core will directly call ->target_index().
 356          */
 357         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 358                                             unsigned int index);
 359         int             (*target_intermediate)(struct cpufreq_policy *policy,
 360                                                unsigned int index);
 361
 362         /* should be defined, if possible */
 363         unsigned int    (*get)(unsigned int cpu);
 364
 365         /* Called to update policy limits on firmware notifications. */
 366         void            (*update_limits)(unsigned int cpu);
 367
 368         /* optional */
 369         int             (*bios_limit)(int cpu, unsigned int *limit);
 370
 371         int             (*online)(struct cpufreq_policy *policy);
 372         int             (*offline)(struct cpufreq_policy *policy);
 373         int             (*exit)(struct cpufreq_policy *policy);
 374         void            (*stop_cpu)(struct cpufreq_policy *policy);
 375         int             (*suspend)(struct cpufreq_policy *policy);
 376         int             (*resume)(struct cpufreq_policy *policy);
 377
 378         /* Will be called after the driver is fully initialized */
 379         void            (*ready)(struct cpufreq_policy *policy);
 380
 381         struct freq_attr **attr;
 382
 383         /* platform specific boost support code */
 384         bool            boost_enabled;
 385         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 386 };
 387
 388 /* flags */
 389
 390 /*
 391  * Set by drivers that need to update internale upper and lower boundaries along
 392  * with the target frequency and so the core and governors should also invoke
 393  * the diver if the target frequency does not change, but the policy min or max
 394  * may have changed.
 395  */
 396 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 397
 398 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 399 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 400
 401 /*
 402  * Set by drivers that want the core to automatically register the cpufreq
 403  * driver as a thermal cooling device.
 404  */
 405 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 406
 407 /*
 408  * This should be set by platforms having multiple clock-domains, i.e.
 409  * supporting multiple policies. With this sysfs directories of governor would
 410  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 411  * governor with different tunables for different clusters.
 412  */
 413 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 414
 415 /*
 416  * Driver will do POSTCHANGE notifications from outside of their ->target()
 417  * routine and so must set cpufreq_driver->flags with this flag, so that core
 418  * can handle them specially.
 419  */
 420 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 421
 422 /*
 423  * Set by drivers which want cpufreq core to check if CPU is running at a
 424  * frequency present in freq-table exposed by the driver. For these drivers if
 425  * CPU is found running at an out of table freq, we will try to set it to a freq
 426  * from the table. And if that fails, we will stop further boot process by
 427  * issuing a BUG_ON().
 428  */
 429 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 430
 431 /*
 432  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 433  * set.
 434  */
 435 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 436
 437 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 438 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 439
 440 bool cpufreq_driver_test_flags(u16 flags);
 441 const char *cpufreq_get_current_driver(void);
 442 void *cpufreq_get_driver_data(void);
 443
 444 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 445 {
 446         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 447                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 448 }
 449
 450 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 451                                                 unsigned int min,
 452                                                 unsigned int max)
 453 {
 454         if (policy->min < min)
 455                 policy->min = min;
 456         if (policy->max < min)
 457                 policy->max = min;
 458         if (policy->min > max)
 459                 policy->min = max;
 460         if (policy->max > max)
 461                 policy->max = max;
 462         if (policy->min > policy->max)
 463                 policy->min = policy->max;
 464         return;
 465 }
 466
 467 static inline void
 468 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 469 {
 470         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 471                                      policy->cpuinfo.max_freq);
 472 }
 473
 474 #ifdef CONFIG_CPU_FREQ
 475 void cpufreq_suspend(void);
 476 void cpufreq_resume(void);
 477 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 478 #else
 479 static inline void cpufreq_suspend(void) {}
 480 static inline void cpufreq_resume(void) {}
 481 #endif
 482
 483 /*********************************************************************
 484  *                     CPUFREQ NOTIFIER INTERFACE                    *
 485  *********************************************************************/
 486
 487 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 488 #define CPUFREQ_POLICY_NOTIFIER         (1)
 489
 490 /* Transition notifiers */
 491 #define CPUFREQ_PRECHANGE               (0)
 492 #define CPUFREQ_POSTCHANGE              (1)
 493
 494 /* Policy Notifiers  */
 495 #define CPUFREQ_CREATE_POLICY           (0)
 496 #define CPUFREQ_REMOVE_POLICY           (1)
 497
 498 #ifdef CONFIG_CPU_FREQ
 499 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 500 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 501
 502 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 503                 struct cpufreq_freqs *freqs);
 504 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 505                 struct cpufreq_freqs *freqs, int transition_failed);
 506
 507 #else /* CONFIG_CPU_FREQ */
 508 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 509                                                 unsigned int list)
 510 {
 511         return 0;
 512 }
 513 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 514                                                 unsigned int list)
 515 {
 516         return 0;
 517 }
 518 #endif /* !CONFIG_CPU_FREQ */
 519
 520 /**
 521  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 522  * safe)
 523  * @old:   old value
 524  * @div:   divisor
 525  * @mult:  multiplier
 526  *
 527  *
 528  * new = old * mult / div
 529  */
 530 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 531                 u_int mult)
 532 {
 533 #if BITS_PER_LONG == 32
 534         u64 result = ((u64) old) * ((u64) mult);
 535         do_div(result, div);
 536         return (unsigned long) result;
 537
 538 #elif BITS_PER_LONG == 64
 539         unsigned long result = old * ((u64) mult);
 540         result /= div;
 541         return result;
 542 #endif
 543 }
 544
 545 /*********************************************************************
 546  *                          CPUFREQ GOVERNORS                        *
 547  *********************************************************************/
 548
 549 #define CPUFREQ_POLICY_UNKNOWN          (0)
 550 /*
 551  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 552  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 553  * two generic policies are available:
 554  */
 555 #define CPUFREQ_POLICY_POWERSAVE        (1)
 556 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 557
 558 /*
 559  * The polling frequency depends on the capability of the processor. Default
 560  * polling frequency is 1000 times the transition latency of the processor. The
 561  * ondemand governor will work on any processor with transition latency <= 10ms,
 562  * using appropriate sampling rate.
 563  */
 564 #define LATENCY_MULTIPLIER              (1000)
 565
 566 struct cpufreq_governor {
 567         char    name[CPUFREQ_NAME_LEN];
 568         int     (*init)(struct cpufreq_policy *policy);
 569         void    (*exit)(struct cpufreq_policy *policy);
 570         int     (*start)(struct cpufreq_policy *policy);
 571         void    (*stop)(struct cpufreq_policy *policy);
 572         void    (*limits)(struct cpufreq_policy *policy);
 573         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 574                                          char *buf);
 575         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 576                                          unsigned int freq);
 577         struct list_head        governor_list;
 578         struct module           *owner;
 579         u8                      flags;
 580 };
 581
 582 /* Governor flags */
 583
 584 /* For governors which change frequency dynamically by themselves */
 585 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 586
 587 /* For governors wanting the target frequency to be set exactly */
 588 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 589
 590
 591 /* Pass a target to the cpufreq driver */
 592 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 593                                         unsigned int target_freq);
 594 void cpufreq_driver_adjust_perf(unsigned int cpu,
 595                                 unsigned long min_perf,
 596                                 unsigned long target_perf,
 597                                 unsigned long capacity);
 598 bool cpufreq_driver_has_adjust_perf(void);
 599 int cpufreq_driver_target(struct cpufreq_policy *policy,
 600                                  unsigned int target_freq,
 601                                  unsigned int relation);
 602 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 603                                    unsigned int target_freq,
 604                                    unsigned int relation);
 605 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 606                                          unsigned int target_freq);
 607 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 608 int cpufreq_register_governor(struct cpufreq_governor *governor);
 609 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 610 int cpufreq_start_governor(struct cpufreq_policy *policy);
 611 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 612
 613 #define cpufreq_governor_init(__governor)                       \
 614 static int __init __governor##_init(void)                       \
 615 {                                                               \
 616         return cpufreq_register_governor(&__governor);  \
 617 }                                                               \
 618 core_initcall(__governor##_init)
 619
 620 #define cpufreq_governor_exit(__governor)                       \
 621 static void __exit __governor##_exit(void)                      \
 622 {                                                               \
 623         return cpufreq_unregister_governor(&__governor);        \
 624 }                                                               \
 625 module_exit(__governor##_exit)
 626
 627 struct cpufreq_governor *cpufreq_default_governor(void);
 628 struct cpufreq_governor *cpufreq_fallback_governor(void);
 629
 630 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 631 {
 632         if (policy->max < policy->cur)
 633                 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
 634         else if (policy->min > policy->cur)
 635                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
 636 }
 637
 638 /* Governor attribute set */
 639 struct gov_attr_set {
 640         struct kobject kobj;
 641         struct list_head policy_list;
 642         struct mutex update_lock;
 643         int usage_count;
 644 };
 645
 646 /* sysfs ops for cpufreq governors */
 647 extern const struct sysfs_ops governor_sysfs_ops;
 648
 649 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 650 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 651 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 652
 653 /* Governor sysfs attribute */
 654 struct governor_attr {
 655         struct attribute attr;
 656         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 657         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 658                          size_t count);
 659 };
 660
 661 /*********************************************************************
 662  *                     FREQUENCY TABLE HELPERS                       *
 663  *********************************************************************/
 664
 665 /* Special Values of .frequency field */
 666 #define CPUFREQ_ENTRY_INVALID   ~0u
 667 #define CPUFREQ_TABLE_END       ~1u
 668 /* Special Values of .flags field */
 669 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 670
 671 struct cpufreq_frequency_table {
 672         unsigned int    flags;
 673         unsigned int    driver_data; /* driver specific data, not used by core */
 674         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 675                                     * order */
 676 };
 677
 678 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 679 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 680                                   struct cpufreq_frequency_table **table);
 681 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 682                                    struct cpufreq_frequency_table **table);
 683 #else
 684 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 685                                                 struct cpufreq_frequency_table
 686                                                 **table)
 687 {
 688         return -EINVAL;
 689 }
 690
 691 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 692                                                  struct cpufreq_frequency_table
 693                                                  **table)
 694 {
 695 }
 696 #endif
 697
 698 /*
 699  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 700  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 701  * @table:      the cpufreq_frequency_table * to iterate over.
 702  */
 703
 704 #define cpufreq_for_each_entry(pos, table)      \
 705         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 706
 707 /*
 708  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 709  *      with index
 710  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 711  * @table:      the cpufreq_frequency_table * to iterate over.
 712  * @idx:        the table entry currently being processed
 713  */
 714
 715 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 716         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 717                 pos++, idx++)
 718
 719 /*
 720  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 721  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 722  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 723  * @table:      the cpufreq_frequency_table * to iterate over.
 724  */
 725
 726 #define cpufreq_for_each_valid_entry(pos, table)                        \
 727         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 728                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 729                         continue;                                       \
 730                 else
 731
 732 /*
 733  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 734  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 735  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 736  * @table:      the cpufreq_frequency_table * to iterate over.
 737  * @idx:        the table entry currently being processed
 738  */
 739
 740 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 741         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 742                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 743                         continue;                                       \
 744                 else
 745
 746
 747 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 748                                     struct cpufreq_frequency_table *table);
 749
 750 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 751                                    struct cpufreq_frequency_table *table);
 752 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 753
 754 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 755                                  unsigned int target_freq,
 756                                  unsigned int relation);
 757 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 758                 unsigned int freq);
 759
 760 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 761
 762 #ifdef CONFIG_CPU_FREQ
 763 int cpufreq_boost_trigger_state(int state);
 764 int cpufreq_boost_enabled(void);
 765 int cpufreq_enable_boost_support(void);
 766 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 767
 768 /* Find lowest freq at or above target in a table in ascending order */
 769 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 770                                               unsigned int target_freq)
 771 {
 772         struct cpufreq_frequency_table *table = policy->freq_table;
 773         struct cpufreq_frequency_table *pos;
 774         unsigned int freq;
 775         int idx, best = -1;
 776
 777         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 778                 freq = pos->frequency;
 779
 780                 if (freq >= target_freq)
 781                         return idx;
 782
 783                 best = idx;
 784         }
 785
 786         return best;
 787 }
 788
 789 /* Find lowest freq at or above target in a table in descending order */
 790 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 791                                               unsigned int target_freq)
 792 {
 793         struct cpufreq_frequency_table *table = policy->freq_table;
 794         struct cpufreq_frequency_table *pos;
 795         unsigned int freq;
 796         int idx, best = -1;
 797
 798         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 799                 freq = pos->frequency;
 800
 801                 if (freq == target_freq)
 802                         return idx;
 803
 804                 if (freq > target_freq) {
 805                         best = idx;
 806                         continue;
 807                 }
 808
 809                 /* No freq found above target_freq */
 810                 if (best == -1)
 811                         return idx;
 812
 813                 return best;
 814         }
 815
 816         return best;
 817 }
 818
 819 /* Works only on sorted freq-tables */
 820 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 821                                              unsigned int target_freq)
 822 {
 823         target_freq = clamp_val(target_freq, policy->min, policy->max);
 824
 825         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 826                 return cpufreq_table_find_index_al(policy, target_freq);
 827         else
 828                 return cpufreq_table_find_index_dl(policy, target_freq);
 829 }
 830
 831 /* Find highest freq at or below target in a table in ascending order */
 832 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 833                                               unsigned int target_freq)
 834 {
 835         struct cpufreq_frequency_table *table = policy->freq_table;
 836         struct cpufreq_frequency_table *pos;
 837         unsigned int freq;
 838         int idx, best = -1;
 839
 840         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 841                 freq = pos->frequency;
 842
 843                 if (freq == target_freq)
 844                         return idx;
 845
 846                 if (freq < target_freq) {
 847                         best = idx;
 848                         continue;
 849                 }
 850
 851                 /* No freq found below target_freq */
 852                 if (best == -1)
 853                         return idx;
 854
 855                 return best;
 856         }
 857
 858         return best;
 859 }
 860
 861 /* Find highest freq at or below target in a table in descending order */
 862 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 863                                               unsigned int target_freq)
 864 {
 865         struct cpufreq_frequency_table *table = policy->freq_table;
 866         struct cpufreq_frequency_table *pos;
 867         unsigned int freq;
 868         int idx, best = -1;
 869
 870         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 871                 freq = pos->frequency;
 872
 873                 if (freq <= target_freq)
 874                         return idx;
 875
 876                 best = idx;
 877         }
 878
 879         return best;
 880 }
 881
 882 /* Works only on sorted freq-tables */
 883 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 884                                              unsigned int target_freq)
 885 {
 886         target_freq = clamp_val(target_freq, policy->min, policy->max);
 887
 888         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 889                 return cpufreq_table_find_index_ah(policy, target_freq);
 890         else
 891                 return cpufreq_table_find_index_dh(policy, target_freq);
 892 }
 893
 894 /* Find closest freq to target in a table in ascending order */
 895 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 896                                               unsigned int target_freq)
 897 {
 898         struct cpufreq_frequency_table *table = policy->freq_table;
 899         struct cpufreq_frequency_table *pos;
 900         unsigned int freq;
 901         int idx, best = -1;
 902
 903         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 904                 freq = pos->frequency;
 905
 906                 if (freq == target_freq)
 907                         return idx;
 908
 909                 if (freq < target_freq) {
 910                         best = idx;
 911                         continue;
 912                 }
 913
 914                 /* No freq found below target_freq */
 915                 if (best == -1)
 916                         return idx;
 917
 918                 /* Choose the closest freq */
 919                 if (target_freq - table[best].frequency > freq - target_freq)
 920                         return idx;
 921
 922                 return best;
 923         }
 924
 925         return best;
 926 }
 927
 928 /* Find closest freq to target in a table in descending order */
 929 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 930                                               unsigned int target_freq)
 931 {
 932         struct cpufreq_frequency_table *table = policy->freq_table;
 933         struct cpufreq_frequency_table *pos;
 934         unsigned int freq;
 935         int idx, best = -1;
 936
 937         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 938                 freq = pos->frequency;
 939
 940                 if (freq == target_freq)
 941                         return idx;
 942
 943                 if (freq > target_freq) {
 944                         best = idx;
 945                         continue;
 946                 }
 947
 948                 /* No freq found above target_freq */
 949                 if (best == -1)
 950                         return idx;
 951
 952                 /* Choose the closest freq */
 953                 if (table[best].frequency - target_freq > target_freq - freq)
 954                         return idx;
 955
 956                 return best;
 957         }
 958
 959         return best;
 960 }
 961
 962 /* Works only on sorted freq-tables */
 963 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
 964                                              unsigned int target_freq)
 965 {
 966         target_freq = clamp_val(target_freq, policy->min, policy->max);
 967
 968         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 969                 return cpufreq_table_find_index_ac(policy, target_freq);
 970         else
 971                 return cpufreq_table_find_index_dc(policy, target_freq);
 972 }
 973
 974 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 975                                                  unsigned int target_freq,
 976                                                  unsigned int relation)
 977 {
 978         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
 979                 return cpufreq_table_index_unsorted(policy, target_freq,
 980                                                     relation);
 981
 982         switch (relation) {
 983         case CPUFREQ_RELATION_L:
 984                 return cpufreq_table_find_index_l(policy, target_freq);
 985         case CPUFREQ_RELATION_H:
 986                 return cpufreq_table_find_index_h(policy, target_freq);
 987         case CPUFREQ_RELATION_C:
 988                 return cpufreq_table_find_index_c(policy, target_freq);
 989         default:
 990                 WARN_ON_ONCE(1);
 991                 return 0;
 992         }
 993 }
 994
 995 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
 996 {
 997         struct cpufreq_frequency_table *pos;
 998         int count = 0;
 999
1000         if (unlikely(!policy->freq_table))
1001                 return 0;
1002
1003         cpufreq_for_each_valid_entry(pos, policy->freq_table)
1004                 count++;
1005
1006         return count;
1007 }
1008 #else
1009 static inline int cpufreq_boost_trigger_state(int state)
1010 {
1011         return 0;
1012 }
1013 static inline int cpufreq_boost_enabled(void)
1014 {
1015         return 0;
1016 }
1017
1018 static inline int cpufreq_enable_boost_support(void)
1019 {
1020         return -EINVAL;
1021 }
1022
1023 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1024 {
1025         return false;
1026 }
1027 #endif
1028
1029 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1030 void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1031                         struct cpufreq_governor *old_gov);
1032 #else
1033 static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1034                         struct cpufreq_governor *old_gov) { }
1035 #endif
1036
1037 extern void arch_freq_prepare_all(void);
1038 extern unsigned int arch_freq_get_on_cpu(int cpu);
1039
1040 #ifndef arch_set_freq_scale
1041 static __always_inline
1042 void arch_set_freq_scale(const struct cpumask *cpus,
1043                          unsigned long cur_freq,
1044                          unsigned long max_freq)
1045 {
1046 }
1047 #endif
1048
1049 /* the following are really really optional */
1050 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1051 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1052 extern struct freq_attr *cpufreq_generic_attr[];
1053 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1054
1055 unsigned int cpufreq_generic_get(unsigned int cpu);
1056 void cpufreq_generic_init(struct cpufreq_policy *policy,
1057                 struct cpufreq_frequency_table *table,
1058                 unsigned int transition_latency);
1059 #endif /* _LINUX_CPUFREQ_H */