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/cpu.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/completion.h>
  15 #include <linux/kobject.h>
  16 #include <linux/notifier.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/pm_opp.h>
  20 #include <linux/pm_qos.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/sysfs.h>
  23
  24 /*********************************************************************
  25  *                        CPUFREQ INTERFACE                          *
  26  *********************************************************************/
  27 /*
  28  * Frequency values here are CPU kHz
  29  *
  30  * Maximum transition latency is in nanoseconds - if it's unknown,
  31  * CPUFREQ_ETERNAL shall be used.
  32  */
  33
  34 #define CPUFREQ_ETERNAL                 (-1)
  35 #define CPUFREQ_NAME_LEN                16
  36 /* Print length for names. Extra 1 space for accommodating '\n' in prints */
  37 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
  38
  39 struct cpufreq_governor;
  40
  41 enum cpufreq_table_sorting {
  42         CPUFREQ_TABLE_UNSORTED,
  43         CPUFREQ_TABLE_SORTED_ASCENDING,
  44         CPUFREQ_TABLE_SORTED_DESCENDING
  45 };
  46
  47 struct cpufreq_cpuinfo {
  48         unsigned int            max_freq;
  49         unsigned int            min_freq;
  50
  51         /* in 10^(-9) s = nanoseconds */
  52         unsigned int            transition_latency;
  53 };
  54
  55 struct cpufreq_policy {
  56         /* CPUs sharing clock, require sw coordination */
  57         cpumask_var_t           cpus;   /* Online CPUs only */
  58         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
  59         cpumask_var_t           real_cpus; /* Related and present */
  60
  61         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  62                                                 should set cpufreq */
  63         unsigned int            cpu;    /* cpu managing this policy, must be online */
  64
  65         struct clk              *clk;
  66         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  67
  68         unsigned int            min;    /* in kHz */
  69         unsigned int            max;    /* in kHz */
  70         unsigned int            cur;    /* in kHz, only needed if cpufreq
  71                                          * governors are used */
  72         unsigned int            suspend_freq; /* freq to set during suspend */
  73
  74         unsigned int            policy; /* see above */
  75         unsigned int            last_policy; /* policy before unplug */
  76         struct cpufreq_governor *governor; /* see below */
  77         void                    *governor_data;
  78         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  79
  80         struct work_struct      update; /* if update_policy() needs to be
  81                                          * called, but you're in IRQ context */
  82
  83         struct freq_constraints constraints;
  84         struct freq_qos_request *min_freq_req;
  85         struct freq_qos_request *max_freq_req;
  86
  87         struct cpufreq_frequency_table  *freq_table;
  88         enum cpufreq_table_sorting freq_table_sorted;
  89
  90         struct list_head        policy_list;
  91         struct kobject          kobj;
  92         struct completion       kobj_unregister;
  93
  94         /*
  95          * The rules for this semaphore:
  96          * - Any routine that wants to read from the policy structure will
  97          *   do a down_read on this semaphore.
  98          * - Any routine that will write to the policy structure and/or may take away
  99          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
 100          *   mode before doing so.
 101          */
 102         struct rw_semaphore     rwsem;
 103
 104         /*
 105          * Fast switch flags:
 106          * - fast_switch_possible should be set by the driver if it can
 107          *   guarantee that frequency can be changed on any CPU sharing the
 108          *   policy and that the change will affect all of the policy CPUs then.
 109          * - fast_switch_enabled is to be set by governors that support fast
 110          *   frequency switching with the help of cpufreq_enable_fast_switch().
 111          */
 112         bool                    fast_switch_possible;
 113         bool                    fast_switch_enabled;
 114
 115         /*
 116          * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
 117          * governor.
 118          */
 119         bool                    strict_target;
 120
 121         /*
 122          * Preferred average time interval between consecutive invocations of
 123          * the driver to set the frequency for this policy.  To be set by the
 124          * scaling driver (0, which is the default, means no preference).
 125          */
 126         unsigned int            transition_delay_us;
 127
 128         /*
 129          * Remote DVFS flag (Not added to the driver structure as we don't want
 130          * to access another structure from scheduler hotpath).
 131          *
 132          * Should be set if CPUs can do DVFS on behalf of other CPUs from
 133          * different cpufreq policies.
 134          */
 135         bool                    dvfs_possible_from_any_cpu;
 136
 137          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 138         unsigned int cached_target_freq;
 139         unsigned int cached_resolved_idx;
 140
 141         /* Synchronization for frequency transitions */
 142         bool                    transition_ongoing; /* Tracks transition status */
 143         spinlock_t              transition_lock;
 144         wait_queue_head_t       transition_wait;
 145         struct task_struct      *transition_task; /* Task which is doing the transition */
 146
 147         /* cpufreq-stats */
 148         struct cpufreq_stats    *stats;
 149
 150         /* For cpufreq driver's internal use */
 151         void                    *driver_data;
 152
 153         /* Pointer to the cooling device if used for thermal mitigation */
 154         struct thermal_cooling_device *cdev;
 155
 156         struct notifier_block nb_min;
 157         struct notifier_block nb_max;
 158 };
 159
 160 /*
 161  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 162  * callback for sanitization.  That callback is only expected to modify the min
 163  * and max values, if necessary, and specifically it must not update the
 164  * frequency table.
 165  */
 166 struct cpufreq_policy_data {
 167         struct cpufreq_cpuinfo          cpuinfo;
 168         struct cpufreq_frequency_table  *freq_table;
 169         unsigned int                    cpu;
 170         unsigned int                    min;    /* in kHz */
 171         unsigned int                    max;    /* in kHz */
 172 };
 173
 174 struct cpufreq_freqs {
 175         struct cpufreq_policy *policy;
 176         unsigned int old;
 177         unsigned int new;
 178         u8 flags;               /* flags of cpufreq_driver, see below. */
 179 };
 180
 181 /* Only for ACPI */
 182 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 183 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 184 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 185 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 186
 187 #ifdef CONFIG_CPU_FREQ
 188 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 189 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 190 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 191 #else
 192 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 193 {
 194         return NULL;
 195 }
 196 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 197 {
 198         return NULL;
 199 }
 200 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 201 #endif
 202
 203 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 204 {
 205         return cpumask_empty(policy->cpus);
 206 }
 207
 208 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 209 {
 210         return cpumask_weight(policy->cpus) > 1;
 211 }
 212
 213 #ifdef CONFIG_CPU_FREQ
 214 unsigned int cpufreq_get(unsigned int cpu);
 215 unsigned int cpufreq_quick_get(unsigned int cpu);
 216 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 217 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 218 void disable_cpufreq(void);
 219
 220 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 221
 222 struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
 223 void cpufreq_cpu_release(struct cpufreq_policy *policy);
 224 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 225 void refresh_frequency_limits(struct cpufreq_policy *policy);
 226 void cpufreq_update_policy(unsigned int cpu);
 227 void cpufreq_update_limits(unsigned int cpu);
 228 bool have_governor_per_policy(void);
 229 bool cpufreq_supports_freq_invariance(void);
 230 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 231 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 232 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 233 #else
 234 static inline unsigned int cpufreq_get(unsigned int cpu)
 235 {
 236         return 0;
 237 }
 238 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 239 {
 240         return 0;
 241 }
 242 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 243 {
 244         return 0;
 245 }
 246 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 247 {
 248         return 0;
 249 }
 250 static inline bool cpufreq_supports_freq_invariance(void)
 251 {
 252         return false;
 253 }
 254 static inline void disable_cpufreq(void) { }
 255 #endif
 256
 257 #ifdef CONFIG_CPU_FREQ_STAT
 258 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 259 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 260 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 261                                      unsigned int new_freq);
 262 #else
 263 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 264 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 265 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 266                                                    unsigned int new_freq) { }
 267 #endif /* CONFIG_CPU_FREQ_STAT */
 268
 269 /*********************************************************************
 270  *                      CPUFREQ DRIVER INTERFACE                     *
 271  *********************************************************************/
 272
 273 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 274 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 275 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 276
 277 struct freq_attr {
 278         struct attribute attr;
 279         ssize_t (*show)(struct cpufreq_policy *, char *);
 280         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 281 };
 282
 283 #define cpufreq_freq_attr_ro(_name)             \
 284 static struct freq_attr _name =                 \
 285 __ATTR(_name, 0444, show_##_name, NULL)
 286
 287 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 288 static struct freq_attr _name =                 \
 289 __ATTR(_name, _perm, show_##_name, NULL)
 290
 291 #define cpufreq_freq_attr_rw(_name)             \
 292 static struct freq_attr _name =                 \
 293 __ATTR(_name, 0644, show_##_name, store_##_name)
 294
 295 #define cpufreq_freq_attr_wo(_name)             \
 296 static struct freq_attr _name =                 \
 297 __ATTR(_name, 0200, NULL, store_##_name)
 298
 299 #define define_one_global_ro(_name)             \
 300 static struct kobj_attribute _name =            \
 301 __ATTR(_name, 0444, show_##_name, NULL)
 302
 303 #define define_one_global_rw(_name)             \
 304 static struct kobj_attribute _name =            \
 305 __ATTR(_name, 0644, show_##_name, store_##_name)
 306
 307
 308 struct cpufreq_driver {
 309         char            name[CPUFREQ_NAME_LEN];
 310         u16             flags;
 311         void            *driver_data;
 312
 313         /* needed by all drivers */
 314         int             (*init)(struct cpufreq_policy *policy);
 315         int             (*verify)(struct cpufreq_policy_data *policy);
 316
 317         /* define one out of two */
 318         int             (*setpolicy)(struct cpufreq_policy *policy);
 319
 320         int             (*target)(struct cpufreq_policy *policy,
 321                                   unsigned int target_freq,
 322                                   unsigned int relation);       /* Deprecated */
 323         int             (*target_index)(struct cpufreq_policy *policy,
 324                                         unsigned int index);
 325         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 326                                        unsigned int target_freq);
 327         /*
 328          * ->fast_switch() replacement for drivers that use an internal
 329          * representation of performance levels and can pass hints other than
 330          * the target performance level to the hardware.
 331          */
 332         void            (*adjust_perf)(unsigned int cpu,
 333                                        unsigned long min_perf,
 334                                        unsigned long target_perf,
 335                                        unsigned long capacity);
 336
 337         /*
 338          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 339          * unset.
 340          *
 341          * get_intermediate should return a stable intermediate frequency
 342          * platform wants to switch to and target_intermediate() should set CPU
 343          * to that frequency, before jumping to the frequency corresponding
 344          * to 'index'. Core will take care of sending notifications and driver
 345          * doesn't have to handle them in target_intermediate() or
 346          * target_index().
 347          *
 348          * Drivers can return '0' from get_intermediate() in case they don't
 349          * wish to switch to intermediate frequency for some target frequency.
 350          * In that case core will directly call ->target_index().
 351          */
 352         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 353                                             unsigned int index);
 354         int             (*target_intermediate)(struct cpufreq_policy *policy,
 355                                                unsigned int index);
 356
 357         /* should be defined, if possible */
 358         unsigned int    (*get)(unsigned int cpu);
 359
 360         /* Called to update policy limits on firmware notifications. */
 361         void            (*update_limits)(unsigned int cpu);
 362
 363         /* optional */
 364         int             (*bios_limit)(int cpu, unsigned int *limit);
 365
 366         int             (*online)(struct cpufreq_policy *policy);
 367         int             (*offline)(struct cpufreq_policy *policy);
 368         int             (*exit)(struct cpufreq_policy *policy);
 369         int             (*suspend)(struct cpufreq_policy *policy);
 370         int             (*resume)(struct cpufreq_policy *policy);
 371
 372         struct freq_attr **attr;
 373
 374         /* platform specific boost support code */
 375         bool            boost_enabled;
 376         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 377
 378         /*
 379          * Set by drivers that want to register with the energy model after the
 380          * policy is properly initialized, but before the governor is started.
 381          */
 382         void            (*register_em)(struct cpufreq_policy *policy);
 383 };
 384
 385 /* flags */
 386
 387 /*
 388  * Set by drivers that need to update internale upper and lower boundaries along
 389  * with the target frequency and so the core and governors should also invoke
 390  * the diver if the target frequency does not change, but the policy min or max
 391  * may have changed.
 392  */
 393 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 394
 395 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 396 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 397
 398 /*
 399  * Set by drivers that want the core to automatically register the cpufreq
 400  * driver as a thermal cooling device.
 401  */
 402 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 403
 404 /*
 405  * This should be set by platforms having multiple clock-domains, i.e.
 406  * supporting multiple policies. With this sysfs directories of governor would
 407  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 408  * governor with different tunables for different clusters.
 409  */
 410 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 411
 412 /*
 413  * Driver will do POSTCHANGE notifications from outside of their ->target()
 414  * routine and so must set cpufreq_driver->flags with this flag, so that core
 415  * can handle them specially.
 416  */
 417 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 418
 419 /*
 420  * Set by drivers which want cpufreq core to check if CPU is running at a
 421  * frequency present in freq-table exposed by the driver. For these drivers if
 422  * CPU is found running at an out of table freq, we will try to set it to a freq
 423  * from the table. And if that fails, we will stop further boot process by
 424  * issuing a BUG_ON().
 425  */
 426 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 427
 428 /*
 429  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 430  * set.
 431  */
 432 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 433
 434 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 435 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 436
 437 bool cpufreq_driver_test_flags(u16 flags);
 438 const char *cpufreq_get_current_driver(void);
 439 void *cpufreq_get_driver_data(void);
 440
 441 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 442 {
 443         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 444                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 445 }
 446
 447 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 448                                                 unsigned int min,
 449                                                 unsigned int max)
 450 {
 451         if (policy->min < min)
 452                 policy->min = min;
 453         if (policy->max < min)
 454                 policy->max = min;
 455         if (policy->min > max)
 456                 policy->min = max;
 457         if (policy->max > max)
 458                 policy->max = max;
 459         if (policy->min > policy->max)
 460                 policy->min = policy->max;
 461         return;
 462 }
 463
 464 static inline void
 465 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 466 {
 467         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 468                                      policy->cpuinfo.max_freq);
 469 }
 470
 471 #ifdef CONFIG_CPU_FREQ
 472 void cpufreq_suspend(void);
 473 void cpufreq_resume(void);
 474 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 475 #else
 476 static inline void cpufreq_suspend(void) {}
 477 static inline void cpufreq_resume(void) {}
 478 #endif
 479
 480 /*********************************************************************
 481  *                     CPUFREQ NOTIFIER INTERFACE                    *
 482  *********************************************************************/
 483
 484 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 485 #define CPUFREQ_POLICY_NOTIFIER         (1)
 486
 487 /* Transition notifiers */
 488 #define CPUFREQ_PRECHANGE               (0)
 489 #define CPUFREQ_POSTCHANGE              (1)
 490
 491 /* Policy Notifiers  */
 492 #define CPUFREQ_CREATE_POLICY           (0)
 493 #define CPUFREQ_REMOVE_POLICY           (1)
 494
 495 #ifdef CONFIG_CPU_FREQ
 496 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 497 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 498
 499 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 500                 struct cpufreq_freqs *freqs);
 501 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 502                 struct cpufreq_freqs *freqs, int transition_failed);
 503
 504 #else /* CONFIG_CPU_FREQ */
 505 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 506                                                 unsigned int list)
 507 {
 508         return 0;
 509 }
 510 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 511                                                 unsigned int list)
 512 {
 513         return 0;
 514 }
 515 #endif /* !CONFIG_CPU_FREQ */
 516
 517 /**
 518  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 519  * safe)
 520  * @old:   old value
 521  * @div:   divisor
 522  * @mult:  multiplier
 523  *
 524  *
 525  * new = old * mult / div
 526  */
 527 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 528                 u_int mult)
 529 {
 530 #if BITS_PER_LONG == 32
 531         u64 result = ((u64) old) * ((u64) mult);
 532         do_div(result, div);
 533         return (unsigned long) result;
 534
 535 #elif BITS_PER_LONG == 64
 536         unsigned long result = old * ((u64) mult);
 537         result /= div;
 538         return result;
 539 #endif
 540 }
 541
 542 /*********************************************************************
 543  *                          CPUFREQ GOVERNORS                        *
 544  *********************************************************************/
 545
 546 #define CPUFREQ_POLICY_UNKNOWN          (0)
 547 /*
 548  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 549  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 550  * two generic policies are available:
 551  */
 552 #define CPUFREQ_POLICY_POWERSAVE        (1)
 553 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 554
 555 /*
 556  * The polling frequency depends on the capability of the processor. Default
 557  * polling frequency is 1000 times the transition latency of the processor. The
 558  * ondemand governor will work on any processor with transition latency <= 10ms,
 559  * using appropriate sampling rate.
 560  */
 561 #define LATENCY_MULTIPLIER              (1000)
 562
 563 struct cpufreq_governor {
 564         char    name[CPUFREQ_NAME_LEN];
 565         int     (*init)(struct cpufreq_policy *policy);
 566         void    (*exit)(struct cpufreq_policy *policy);
 567         int     (*start)(struct cpufreq_policy *policy);
 568         void    (*stop)(struct cpufreq_policy *policy);
 569         void    (*limits)(struct cpufreq_policy *policy);
 570         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 571                                          char *buf);
 572         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 573                                          unsigned int freq);
 574         struct list_head        governor_list;
 575         struct module           *owner;
 576         u8                      flags;
 577 };
 578
 579 /* Governor flags */
 580
 581 /* For governors which change frequency dynamically by themselves */
 582 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 583
 584 /* For governors wanting the target frequency to be set exactly */
 585 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 586
 587
 588 /* Pass a target to the cpufreq driver */
 589 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 590                                         unsigned int target_freq);
 591 void cpufreq_driver_adjust_perf(unsigned int cpu,
 592                                 unsigned long min_perf,
 593                                 unsigned long target_perf,
 594                                 unsigned long capacity);
 595 bool cpufreq_driver_has_adjust_perf(void);
 596 int cpufreq_driver_target(struct cpufreq_policy *policy,
 597                                  unsigned int target_freq,
 598                                  unsigned int relation);
 599 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 600                                    unsigned int target_freq,
 601                                    unsigned int relation);
 602 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 603                                          unsigned int target_freq);
 604 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 605 int cpufreq_register_governor(struct cpufreq_governor *governor);
 606 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 607 int cpufreq_start_governor(struct cpufreq_policy *policy);
 608 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 609
 610 #define cpufreq_governor_init(__governor)                       \
 611 static int __init __governor##_init(void)                       \
 612 {                                                               \
 613         return cpufreq_register_governor(&__governor);  \
 614 }                                                               \
 615 core_initcall(__governor##_init)
 616
 617 #define cpufreq_governor_exit(__governor)                       \
 618 static void __exit __governor##_exit(void)                      \
 619 {                                                               \
 620         return cpufreq_unregister_governor(&__governor);        \
 621 }                                                               \
 622 module_exit(__governor##_exit)
 623
 624 struct cpufreq_governor *cpufreq_default_governor(void);
 625 struct cpufreq_governor *cpufreq_fallback_governor(void);
 626
 627 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 628 {
 629         if (policy->max < policy->cur)
 630                 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
 631         else if (policy->min > policy->cur)
 632                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
 633 }
 634
 635 /* Governor attribute set */
 636 struct gov_attr_set {
 637         struct kobject kobj;
 638         struct list_head policy_list;
 639         struct mutex update_lock;
 640         int usage_count;
 641 };
 642
 643 /* sysfs ops for cpufreq governors */
 644 extern const struct sysfs_ops governor_sysfs_ops;
 645
 646 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 647 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 648 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 649
 650 /* Governor sysfs attribute */
 651 struct governor_attr {
 652         struct attribute attr;
 653         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 654         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 655                          size_t count);
 656 };
 657
 658 /*********************************************************************
 659  *                     FREQUENCY TABLE HELPERS                       *
 660  *********************************************************************/
 661
 662 /* Special Values of .frequency field */
 663 #define CPUFREQ_ENTRY_INVALID   ~0u
 664 #define CPUFREQ_TABLE_END       ~1u
 665 /* Special Values of .flags field */
 666 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 667
 668 struct cpufreq_frequency_table {
 669         unsigned int    flags;
 670         unsigned int    driver_data; /* driver specific data, not used by core */
 671         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 672                                     * order */
 673 };
 674
 675 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 676 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 677                                   struct cpufreq_frequency_table **table);
 678 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 679                                    struct cpufreq_frequency_table **table);
 680 #else
 681 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 682                                                 struct cpufreq_frequency_table
 683                                                 **table)
 684 {
 685         return -EINVAL;
 686 }
 687
 688 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 689                                                  struct cpufreq_frequency_table
 690                                                  **table)
 691 {
 692 }
 693 #endif
 694
 695 /*
 696  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 697  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 698  * @table:      the cpufreq_frequency_table * to iterate over.
 699  */
 700
 701 #define cpufreq_for_each_entry(pos, table)      \
 702         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 703
 704 /*
 705  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 706  *      with index
 707  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 708  * @table:      the cpufreq_frequency_table * to iterate over.
 709  * @idx:        the table entry currently being processed
 710  */
 711
 712 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 713         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 714                 pos++, idx++)
 715
 716 /*
 717  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 718  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 719  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 720  * @table:      the cpufreq_frequency_table * to iterate over.
 721  */
 722
 723 #define cpufreq_for_each_valid_entry(pos, table)                        \
 724         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 725                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 726                         continue;                                       \
 727                 else
 728
 729 /*
 730  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 731  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 732  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 733  * @table:      the cpufreq_frequency_table * to iterate over.
 734  * @idx:        the table entry currently being processed
 735  */
 736
 737 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 738         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 739                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 740                         continue;                                       \
 741                 else
 742
 743
 744 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 745                                     struct cpufreq_frequency_table *table);
 746
 747 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 748                                    struct cpufreq_frequency_table *table);
 749 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 750
 751 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 752                                  unsigned int target_freq,
 753                                  unsigned int relation);
 754 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 755                 unsigned int freq);
 756
 757 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 758
 759 #ifdef CONFIG_CPU_FREQ
 760 int cpufreq_boost_trigger_state(int state);
 761 int cpufreq_boost_enabled(void);
 762 int cpufreq_enable_boost_support(void);
 763 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 764
 765 /* Find lowest freq at or above target in a table in ascending order */
 766 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 767                                               unsigned int target_freq)
 768 {
 769         struct cpufreq_frequency_table *table = policy->freq_table;
 770         struct cpufreq_frequency_table *pos;
 771         unsigned int freq;
 772         int idx, best = -1;
 773
 774         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 775                 freq = pos->frequency;
 776
 777                 if (freq >= target_freq)
 778                         return idx;
 779
 780                 best = idx;
 781         }
 782
 783         return best;
 784 }
 785
 786 /* Find lowest freq at or above target in a table in descending order */
 787 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 788                                               unsigned int target_freq)
 789 {
 790         struct cpufreq_frequency_table *table = policy->freq_table;
 791         struct cpufreq_frequency_table *pos;
 792         unsigned int freq;
 793         int idx, best = -1;
 794
 795         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 796                 freq = pos->frequency;
 797
 798                 if (freq == target_freq)
 799                         return idx;
 800
 801                 if (freq > target_freq) {
 802                         best = idx;
 803                         continue;
 804                 }
 805
 806                 /* No freq found above target_freq */
 807                 if (best == -1)
 808                         return idx;
 809
 810                 return best;
 811         }
 812
 813         return best;
 814 }
 815
 816 /* Works only on sorted freq-tables */
 817 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 818                                              unsigned int target_freq)
 819 {
 820         target_freq = clamp_val(target_freq, policy->min, policy->max);
 821
 822         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 823                 return cpufreq_table_find_index_al(policy, target_freq);
 824         else
 825                 return cpufreq_table_find_index_dl(policy, target_freq);
 826 }
 827
 828 /* Find highest freq at or below target in a table in ascending order */
 829 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 830                                               unsigned int target_freq)
 831 {
 832         struct cpufreq_frequency_table *table = policy->freq_table;
 833         struct cpufreq_frequency_table *pos;
 834         unsigned int freq;
 835         int idx, best = -1;
 836
 837         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 838                 freq = pos->frequency;
 839
 840                 if (freq == target_freq)
 841                         return idx;
 842
 843                 if (freq < target_freq) {
 844                         best = idx;
 845                         continue;
 846                 }
 847
 848                 /* No freq found below target_freq */
 849                 if (best == -1)
 850                         return idx;
 851
 852                 return best;
 853         }
 854
 855         return best;
 856 }
 857
 858 /* Find highest freq at or below target in a table in descending order */
 859 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 860                                               unsigned int target_freq)
 861 {
 862         struct cpufreq_frequency_table *table = policy->freq_table;
 863         struct cpufreq_frequency_table *pos;
 864         unsigned int freq;
 865         int idx, best = -1;
 866
 867         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 868                 freq = pos->frequency;
 869
 870                 if (freq <= target_freq)
 871                         return idx;
 872
 873                 best = idx;
 874         }
 875
 876         return best;
 877 }
 878
 879 /* Works only on sorted freq-tables */
 880 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 881                                              unsigned int target_freq)
 882 {
 883         target_freq = clamp_val(target_freq, policy->min, policy->max);
 884
 885         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 886                 return cpufreq_table_find_index_ah(policy, target_freq);
 887         else
 888                 return cpufreq_table_find_index_dh(policy, target_freq);
 889 }
 890
 891 /* Find closest freq to target in a table in ascending order */
 892 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 893                                               unsigned int target_freq)
 894 {
 895         struct cpufreq_frequency_table *table = policy->freq_table;
 896         struct cpufreq_frequency_table *pos;
 897         unsigned int freq;
 898         int idx, best = -1;
 899
 900         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 901                 freq = pos->frequency;
 902
 903                 if (freq == target_freq)
 904                         return idx;
 905
 906                 if (freq < target_freq) {
 907                         best = idx;
 908                         continue;
 909                 }
 910
 911                 /* No freq found below target_freq */
 912                 if (best == -1)
 913                         return idx;
 914
 915                 /* Choose the closest freq */
 916                 if (target_freq - table[best].frequency > freq - target_freq)
 917                         return idx;
 918
 919                 return best;
 920         }
 921
 922         return best;
 923 }
 924
 925 /* Find closest freq to target in a table in descending order */
 926 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 927                                               unsigned int target_freq)
 928 {
 929         struct cpufreq_frequency_table *table = policy->freq_table;
 930         struct cpufreq_frequency_table *pos;
 931         unsigned int freq;
 932         int idx, best = -1;
 933
 934         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 935                 freq = pos->frequency;
 936
 937                 if (freq == target_freq)
 938                         return idx;
 939
 940                 if (freq > target_freq) {
 941                         best = idx;
 942                         continue;
 943                 }
 944
 945                 /* No freq found above target_freq */
 946                 if (best == -1)
 947                         return idx;
 948
 949                 /* Choose the closest freq */
 950                 if (table[best].frequency - target_freq > target_freq - freq)
 951                         return idx;
 952
 953                 return best;
 954         }
 955
 956         return best;
 957 }
 958
 959 /* Works only on sorted freq-tables */
 960 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
 961                                              unsigned int target_freq)
 962 {
 963         target_freq = clamp_val(target_freq, policy->min, policy->max);
 964
 965         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 966                 return cpufreq_table_find_index_ac(policy, target_freq);
 967         else
 968                 return cpufreq_table_find_index_dc(policy, target_freq);
 969 }
 970
 971 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 972                                                  unsigned int target_freq,
 973                                                  unsigned int relation)
 974 {
 975         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
 976                 return cpufreq_table_index_unsorted(policy, target_freq,
 977                                                     relation);
 978
 979         switch (relation) {
 980         case CPUFREQ_RELATION_L:
 981                 return cpufreq_table_find_index_l(policy, target_freq);
 982         case CPUFREQ_RELATION_H:
 983                 return cpufreq_table_find_index_h(policy, target_freq);
 984         case CPUFREQ_RELATION_C:
 985                 return cpufreq_table_find_index_c(policy, target_freq);
 986         default:
 987                 WARN_ON_ONCE(1);
 988                 return 0;
 989         }
 990 }
 991
 992 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
 993 {
 994         struct cpufreq_frequency_table *pos;
 995         int count = 0;
 996
 997         if (unlikely(!policy->freq_table))
 998                 return 0;
 999
1000         cpufreq_for_each_valid_entry(pos, policy->freq_table)
1001                 count++;
1002
1003         return count;
1004 }
1005
1006 static inline int parse_perf_domain(int cpu, const char *list_name,
1007                                     const char *cell_name)
1008 {
1009         struct device_node *cpu_np;
1010         struct of_phandle_args args;
1011         int ret;
1012
1013         cpu_np = of_cpu_device_node_get(cpu);
1014         if (!cpu_np)
1015                 return -ENODEV;
1016
1017         ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
1018                                          &args);
1019         if (ret < 0)
1020                 return ret;
1021
1022         of_node_put(cpu_np);
1023
1024         return args.args[0];
1025 }
1026
1027 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1028                                                      const char *cell_name, struct cpumask *cpumask)
1029 {
1030         int target_idx;
1031         int cpu, ret;
1032
1033         ret = parse_perf_domain(pcpu, list_name, cell_name);
1034         if (ret < 0)
1035                 return ret;
1036
1037         target_idx = ret;
1038         cpumask_set_cpu(pcpu, cpumask);
1039
1040         for_each_possible_cpu(cpu) {
1041                 if (cpu == pcpu)
1042                         continue;
1043
1044                 ret = parse_perf_domain(pcpu, list_name, cell_name);
1045                 if (ret < 0)
1046                         continue;
1047
1048                 if (target_idx == ret)
1049                         cpumask_set_cpu(cpu, cpumask);
1050         }
1051
1052         return target_idx;
1053 }
1054 #else
1055 static inline int cpufreq_boost_trigger_state(int state)
1056 {
1057         return 0;
1058 }
1059 static inline int cpufreq_boost_enabled(void)
1060 {
1061         return 0;
1062 }
1063
1064 static inline int cpufreq_enable_boost_support(void)
1065 {
1066         return -EINVAL;
1067 }
1068
1069 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1070 {
1071         return false;
1072 }
1073
1074 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1075                                                      const char *cell_name, struct cpumask *cpumask)
1076 {
1077         return -EOPNOTSUPP;
1078 }
1079 #endif
1080
1081 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1082 void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1083                         struct cpufreq_governor *old_gov);
1084 #else
1085 static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1086                         struct cpufreq_governor *old_gov) { }
1087 #endif
1088
1089 extern void arch_freq_prepare_all(void);
1090 extern unsigned int arch_freq_get_on_cpu(int cpu);
1091
1092 #ifndef arch_set_freq_scale
1093 static __always_inline
1094 void arch_set_freq_scale(const struct cpumask *cpus,
1095                          unsigned long cur_freq,
1096                          unsigned long max_freq)
1097 {
1098 }
1099 #endif
1100 /* the following are really really optional */
1101 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1102 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1103 extern struct freq_attr *cpufreq_generic_attr[];
1104 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1105
1106 unsigned int cpufreq_generic_get(unsigned int cpu);
1107 void cpufreq_generic_init(struct cpufreq_policy *policy,
1108                 struct cpufreq_frequency_table *table,
1109                 unsigned int transition_latency);
1110
1111 static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
1112 {
1113         dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
1114                                   policy->related_cpus);
1115 }
1116 #endif /* _LINUX_CPUFREQ_H */