include/linux/cpufreq.h

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