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            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          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 335          * unset.
 336          *
 337          * get_intermediate should return a stable intermediate frequency
 338          * platform wants to switch to and target_intermediate() should set CPU
 339          * to that frequency, before jumping to the frequency corresponding
 340          * to 'index'. Core will take care of sending notifications and driver
 341          * doesn't have to handle them in target_intermediate() or
 342          * target_index().
 343          *
 344          * Drivers can return '0' from get_intermediate() in case they don't
 345          * wish to switch to intermediate frequency for some target frequency.
 346          * In that case core will directly call ->target_index().
 347          */
 348         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 349                                             unsigned int index);
 350         int             (*target_intermediate)(struct cpufreq_policy *policy,
 351                                                unsigned int index);
 352
 353         /* should be defined, if possible */
 354         unsigned int    (*get)(unsigned int cpu);
 355
 356         /* Called to update policy limits on firmware notifications. */
 357         void            (*update_limits)(unsigned int cpu);
 358
 359         /* optional */
 360         int             (*bios_limit)(int cpu, unsigned int *limit);
 361
 362         int             (*online)(struct cpufreq_policy *policy);
 363         int             (*offline)(struct cpufreq_policy *policy);
 364         int             (*exit)(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 /*
 381  * Set by drivers that need to update internale upper and lower boundaries along
 382  * with the target frequency and so the core and governors should also invoke
 383  * the diver if the target frequency does not change, but the policy min or max
 384  * may have changed.
 385  */
 386 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 387
 388 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 389 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 390
 391 /*
 392  * Set by drivers that want the core to automatically register the cpufreq
 393  * driver as a thermal cooling device.
 394  */
 395 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 396
 397 /*
 398  * This should be set by platforms having multiple clock-domains, i.e.
 399  * supporting multiple policies. With this sysfs directories of governor would
 400  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 401  * governor with different tunables for different clusters.
 402  */
 403 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 404
 405 /*
 406  * Driver will do POSTCHANGE notifications from outside of their ->target()
 407  * routine and so must set cpufreq_driver->flags with this flag, so that core
 408  * can handle them specially.
 409  */
 410 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 411
 412 /*
 413  * Set by drivers which want cpufreq core to check if CPU is running at a
 414  * frequency present in freq-table exposed by the driver. For these drivers if
 415  * CPU is found running at an out of table freq, we will try to set it to a freq
 416  * from the table. And if that fails, we will stop further boot process by
 417  * issuing a BUG_ON().
 418  */
 419 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 420
 421 /*
 422  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 423  * set.
 424  */
 425 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 426
 427 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 428 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 429
 430 bool cpufreq_driver_test_flags(u16 flags);
 431 const char *cpufreq_get_current_driver(void);
 432 void *cpufreq_get_driver_data(void);
 433
 434 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 435 {
 436         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 437                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 438 }
 439
 440 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 441                                                 unsigned int min,
 442                                                 unsigned int max)
 443 {
 444         if (policy->min < min)
 445                 policy->min = min;
 446         if (policy->max < min)
 447                 policy->max = min;
 448         if (policy->min > max)
 449                 policy->min = max;
 450         if (policy->max > max)
 451                 policy->max = max;
 452         if (policy->min > policy->max)
 453                 policy->min = policy->max;
 454         return;
 455 }
 456
 457 static inline void
 458 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 459 {
 460         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 461                                      policy->cpuinfo.max_freq);
 462 }
 463
 464 #ifdef CONFIG_CPU_FREQ
 465 void cpufreq_suspend(void);
 466 void cpufreq_resume(void);
 467 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 468 #else
 469 static inline void cpufreq_suspend(void) {}
 470 static inline void cpufreq_resume(void) {}
 471 #endif
 472
 473 /*********************************************************************
 474  *                     CPUFREQ NOTIFIER INTERFACE                    *
 475  *********************************************************************/
 476
 477 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 478 #define CPUFREQ_POLICY_NOTIFIER         (1)
 479
 480 /* Transition notifiers */
 481 #define CPUFREQ_PRECHANGE               (0)
 482 #define CPUFREQ_POSTCHANGE              (1)
 483
 484 /* Policy Notifiers  */
 485 #define CPUFREQ_CREATE_POLICY           (0)
 486 #define CPUFREQ_REMOVE_POLICY           (1)
 487
 488 #ifdef CONFIG_CPU_FREQ
 489 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 490 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 491
 492 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 493                 struct cpufreq_freqs *freqs);
 494 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 495                 struct cpufreq_freqs *freqs, int transition_failed);
 496
 497 #else /* CONFIG_CPU_FREQ */
 498 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 499                                                 unsigned int list)
 500 {
 501         return 0;
 502 }
 503 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 504                                                 unsigned int list)
 505 {
 506         return 0;
 507 }
 508 #endif /* !CONFIG_CPU_FREQ */
 509
 510 /**
 511  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 512  * safe)
 513  * @old:   old value
 514  * @div:   divisor
 515  * @mult:  multiplier
 516  *
 517  *
 518  * new = old * mult / div
 519  */
 520 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 521                 u_int mult)
 522 {
 523 #if BITS_PER_LONG == 32
 524         u64 result = ((u64) old) * ((u64) mult);
 525         do_div(result, div);
 526         return (unsigned long) result;
 527
 528 #elif BITS_PER_LONG == 64
 529         unsigned long result = old * ((u64) mult);
 530         result /= div;
 531         return result;
 532 #endif
 533 }
 534
 535 /*********************************************************************
 536  *                          CPUFREQ GOVERNORS                        *
 537  *********************************************************************/
 538
 539 #define CPUFREQ_POLICY_UNKNOWN          (0)
 540 /*
 541  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 542  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 543  * two generic policies are available:
 544  */
 545 #define CPUFREQ_POLICY_POWERSAVE        (1)
 546 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 547
 548 /*
 549  * The polling frequency depends on the capability of the processor. Default
 550  * polling frequency is 1000 times the transition latency of the processor. The
 551  * ondemand governor will work on any processor with transition latency <= 10ms,
 552  * using appropriate sampling rate.
 553  */
 554 #define LATENCY_MULTIPLIER              (1000)
 555
 556 struct cpufreq_governor {
 557         char    name[CPUFREQ_NAME_LEN];
 558         int     (*init)(struct cpufreq_policy *policy);
 559         void    (*exit)(struct cpufreq_policy *policy);
 560         int     (*start)(struct cpufreq_policy *policy);
 561         void    (*stop)(struct cpufreq_policy *policy);
 562         void    (*limits)(struct cpufreq_policy *policy);
 563         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 564                                          char *buf);
 565         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 566                                          unsigned int freq);
 567         struct list_head        governor_list;
 568         struct module           *owner;
 569         u8                      flags;
 570 };
 571
 572 /* Governor flags */
 573
 574 /* For governors which change frequency dynamically by themselves */
 575 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 576
 577 /* For governors wanting the target frequency to be set exactly */
 578 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 579
 580
 581 /* Pass a target to the cpufreq driver */
 582 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 583                                         unsigned int target_freq);
 584 void cpufreq_driver_adjust_perf(unsigned int cpu,
 585                                 unsigned long min_perf,
 586                                 unsigned long target_perf,
 587                                 unsigned long capacity);
 588 bool cpufreq_driver_has_adjust_perf(void);
 589 int cpufreq_driver_target(struct cpufreq_policy *policy,
 590                                  unsigned int target_freq,
 591                                  unsigned int relation);
 592 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 593                                    unsigned int target_freq,
 594                                    unsigned int relation);
 595 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 596                                          unsigned int target_freq);
 597 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 598 int cpufreq_register_governor(struct cpufreq_governor *governor);
 599 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 600 int cpufreq_start_governor(struct cpufreq_policy *policy);
 601 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 602
 603 #define cpufreq_governor_init(__governor)                       \
 604 static int __init __governor##_init(void)                       \
 605 {                                                               \
 606         return cpufreq_register_governor(&__governor);  \
 607 }                                                               \
 608 core_initcall(__governor##_init)
 609
 610 #define cpufreq_governor_exit(__governor)                       \
 611 static void __exit __governor##_exit(void)                      \
 612 {                                                               \
 613         return cpufreq_unregister_governor(&__governor);        \
 614 }                                                               \
 615 module_exit(__governor##_exit)
 616
 617 struct cpufreq_governor *cpufreq_default_governor(void);
 618 struct cpufreq_governor *cpufreq_fallback_governor(void);
 619
 620 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 621 {
 622         if (policy->max < policy->cur)
 623                 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
 624         else if (policy->min > policy->cur)
 625                 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
 626 }
 627
 628 /* Governor attribute set */
 629 struct gov_attr_set {
 630         struct kobject kobj;
 631         struct list_head policy_list;
 632         struct mutex update_lock;
 633         int usage_count;
 634 };
 635
 636 /* sysfs ops for cpufreq governors */
 637 extern const struct sysfs_ops governor_sysfs_ops;
 638
 639 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 640 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 641 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 642
 643 /* Governor sysfs attribute */
 644 struct governor_attr {
 645         struct attribute attr;
 646         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 647         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 648                          size_t count);
 649 };
 650
 651 /*********************************************************************
 652  *                     FREQUENCY TABLE HELPERS                       *
 653  *********************************************************************/
 654
 655 /* Special Values of .frequency field */
 656 #define CPUFREQ_ENTRY_INVALID   ~0u
 657 #define CPUFREQ_TABLE_END       ~1u
 658 /* Special Values of .flags field */
 659 #define CPUFREQ_BOOST_FREQ      (1 << 0)
 660
 661 struct cpufreq_frequency_table {
 662         unsigned int    flags;
 663         unsigned int    driver_data; /* driver specific data, not used by core */
 664         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 665                                     * order */
 666 };
 667
 668 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 669 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 670                                   struct cpufreq_frequency_table **table);
 671 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 672                                    struct cpufreq_frequency_table **table);
 673 #else
 674 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 675                                                 struct cpufreq_frequency_table
 676                                                 **table)
 677 {
 678         return -EINVAL;
 679 }
 680
 681 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 682                                                  struct cpufreq_frequency_table
 683                                                  **table)
 684 {
 685 }
 686 #endif
 687
 688 /*
 689  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 690  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 691  * @table:      the cpufreq_frequency_table * to iterate over.
 692  */
 693
 694 #define cpufreq_for_each_entry(pos, table)      \
 695         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 696
 697 /*
 698  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 699  *      with index
 700  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 701  * @table:      the cpufreq_frequency_table * to iterate over.
 702  * @idx:        the table entry currently being processed
 703  */
 704
 705 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 706         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 707                 pos++, idx++)
 708
 709 /*
 710  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 711  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 712  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 713  * @table:      the cpufreq_frequency_table * to iterate over.
 714  */
 715
 716 #define cpufreq_for_each_valid_entry(pos, table)                        \
 717         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 718                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 719                         continue;                                       \
 720                 else
 721
 722 /*
 723  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 724  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 725  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 726  * @table:      the cpufreq_frequency_table * to iterate over.
 727  * @idx:        the table entry currently being processed
 728  */
 729
 730 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 731         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 732                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 733                         continue;                                       \
 734                 else
 735
 736
 737 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 738                                     struct cpufreq_frequency_table *table);
 739
 740 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 741                                    struct cpufreq_frequency_table *table);
 742 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 743
 744 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 745                                  unsigned int target_freq,
 746                                  unsigned int relation);
 747 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 748                 unsigned int freq);
 749
 750 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 751
 752 #ifdef CONFIG_CPU_FREQ
 753 int cpufreq_boost_trigger_state(int state);
 754 int cpufreq_boost_enabled(void);
 755 int cpufreq_enable_boost_support(void);
 756 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 757
 758 /* Find lowest freq at or above target in a table in ascending order */
 759 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 760                                               unsigned int target_freq)
 761 {
 762         struct cpufreq_frequency_table *table = policy->freq_table;
 763         struct cpufreq_frequency_table *pos;
 764         unsigned int freq;
 765         int idx, best = -1;
 766
 767         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 768                 freq = pos->frequency;
 769
 770                 if (freq >= target_freq)
 771                         return idx;
 772
 773                 best = idx;
 774         }
 775
 776         return best;
 777 }
 778
 779 /* Find lowest freq at or above target in a table in descending order */
 780 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 781                                               unsigned int target_freq)
 782 {
 783         struct cpufreq_frequency_table *table = policy->freq_table;
 784         struct cpufreq_frequency_table *pos;
 785         unsigned int freq;
 786         int idx, best = -1;
 787
 788         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 789                 freq = pos->frequency;
 790
 791                 if (freq == target_freq)
 792                         return idx;
 793
 794                 if (freq > target_freq) {
 795                         best = idx;
 796                         continue;
 797                 }
 798
 799                 /* No freq found above target_freq */
 800                 if (best == -1)
 801                         return idx;
 802
 803                 return best;
 804         }
 805
 806         return best;
 807 }
 808
 809 /* Works only on sorted freq-tables */
 810 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 811                                              unsigned int target_freq)
 812 {
 813         target_freq = clamp_val(target_freq, policy->min, policy->max);
 814
 815         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 816                 return cpufreq_table_find_index_al(policy, target_freq);
 817         else
 818                 return cpufreq_table_find_index_dl(policy, target_freq);
 819 }
 820
 821 /* Find highest freq at or below target in a table in ascending order */
 822 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 823                                               unsigned int target_freq)
 824 {
 825         struct cpufreq_frequency_table *table = policy->freq_table;
 826         struct cpufreq_frequency_table *pos;
 827         unsigned int freq;
 828         int idx, best = -1;
 829
 830         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 831                 freq = pos->frequency;
 832
 833                 if (freq == target_freq)
 834                         return idx;
 835
 836                 if (freq < target_freq) {
 837                         best = idx;
 838                         continue;
 839                 }
 840
 841                 /* No freq found below target_freq */
 842                 if (best == -1)
 843                         return idx;
 844
 845                 return best;
 846         }
 847
 848         return best;
 849 }
 850
 851 /* Find highest freq at or below target in a table in descending order */
 852 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 853                                               unsigned int target_freq)
 854 {
 855         struct cpufreq_frequency_table *table = policy->freq_table;
 856         struct cpufreq_frequency_table *pos;
 857         unsigned int freq;
 858         int idx, best = -1;
 859
 860         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 861                 freq = pos->frequency;
 862
 863                 if (freq <= target_freq)
 864                         return idx;
 865
 866                 best = idx;
 867         }
 868
 869         return best;
 870 }
 871
 872 /* Works only on sorted freq-tables */
 873 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 874                                              unsigned int target_freq)
 875 {
 876         target_freq = clamp_val(target_freq, policy->min, policy->max);
 877
 878         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 879                 return cpufreq_table_find_index_ah(policy, target_freq);
 880         else
 881                 return cpufreq_table_find_index_dh(policy, target_freq);
 882 }
 883
 884 /* Find closest freq to target in a table in ascending order */
 885 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 886                                               unsigned int target_freq)
 887 {
 888         struct cpufreq_frequency_table *table = policy->freq_table;
 889         struct cpufreq_frequency_table *pos;
 890         unsigned int freq;
 891         int idx, best = -1;
 892
 893         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 894                 freq = pos->frequency;
 895
 896                 if (freq == target_freq)
 897                         return idx;
 898
 899                 if (freq < target_freq) {
 900                         best = idx;
 901                         continue;
 902                 }
 903
 904                 /* No freq found below target_freq */
 905                 if (best == -1)
 906                         return idx;
 907
 908                 /* Choose the closest freq */
 909                 if (target_freq - table[best].frequency > freq - target_freq)
 910                         return idx;
 911
 912                 return best;
 913         }
 914
 915         return best;
 916 }
 917
 918 /* Find closest freq to target in a table in descending order */
 919 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 920                                               unsigned int target_freq)
 921 {
 922         struct cpufreq_frequency_table *table = policy->freq_table;
 923         struct cpufreq_frequency_table *pos;
 924         unsigned int freq;
 925         int idx, best = -1;
 926
 927         cpufreq_for_each_valid_entry_idx(pos, table, idx) {
 928                 freq = pos->frequency;
 929
 930                 if (freq == target_freq)
 931                         return idx;
 932
 933                 if (freq > target_freq) {
 934                         best = idx;
 935                         continue;
 936                 }
 937
 938                 /* No freq found above target_freq */
 939                 if (best == -1)
 940                         return idx;
 941
 942                 /* Choose the closest freq */
 943                 if (table[best].frequency - target_freq > target_freq - freq)
 944                         return idx;
 945
 946                 return best;
 947         }
 948
 949         return best;
 950 }
 951
 952 /* Works only on sorted freq-tables */
 953 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
 954                                              unsigned int target_freq)
 955 {
 956         target_freq = clamp_val(target_freq, policy->min, policy->max);
 957
 958         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 959                 return cpufreq_table_find_index_ac(policy, target_freq);
 960         else
 961                 return cpufreq_table_find_index_dc(policy, target_freq);
 962 }
 963
 964 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 965                                                  unsigned int target_freq,
 966                                                  unsigned int relation)
 967 {
 968         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
 969                 return cpufreq_table_index_unsorted(policy, target_freq,
 970                                                     relation);
 971
 972         switch (relation) {
 973         case CPUFREQ_RELATION_L:
 974                 return cpufreq_table_find_index_l(policy, target_freq);
 975         case CPUFREQ_RELATION_H:
 976                 return cpufreq_table_find_index_h(policy, target_freq);
 977         case CPUFREQ_RELATION_C:
 978                 return cpufreq_table_find_index_c(policy, target_freq);
 979         default:
 980                 WARN_ON_ONCE(1);
 981                 return 0;
 982         }
 983 }
 984
 985 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
 986 {
 987         struct cpufreq_frequency_table *pos;
 988         int count = 0;
 989
 990         if (unlikely(!policy->freq_table))
 991                 return 0;
 992
 993         cpufreq_for_each_valid_entry(pos, policy->freq_table)
 994                 count++;
 995
 996         return count;
 997 }
 998 #else
 999 static inline int cpufreq_boost_trigger_state(int state)
1000 {
1001         return 0;
1002 }
1003 static inline int cpufreq_boost_enabled(void)
1004 {
1005         return 0;
1006 }
1007
1008 static inline int cpufreq_enable_boost_support(void)
1009 {
1010         return -EINVAL;
1011 }
1012
1013 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1014 {
1015         return false;
1016 }
1017 #endif
1018
1019 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1020 void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1021                         struct cpufreq_governor *old_gov);
1022 #else
1023 static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1024                         struct cpufreq_governor *old_gov) { }
1025 #endif
1026
1027 extern void arch_freq_prepare_all(void);
1028 extern unsigned int arch_freq_get_on_cpu(int cpu);
1029
1030 #ifndef arch_set_freq_scale
1031 static __always_inline
1032 void arch_set_freq_scale(const struct cpumask *cpus,
1033                          unsigned long cur_freq,
1034                          unsigned long max_freq)
1035 {
1036 }
1037 #endif
1038
1039 /* the following are really really optional */
1040 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1041 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1042 extern struct freq_attr *cpufreq_generic_attr[];
1043 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1044
1045 unsigned int cpufreq_generic_get(unsigned int cpu);
1046 void cpufreq_generic_init(struct cpufreq_policy *policy,
1047                 struct cpufreq_frequency_table *table,
1048                 unsigned int transition_latency);
1049 #endif /* _LINUX_CPUFREQ_H */