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