include/linux/cpufreq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/include/linux/cpufreq.h
   4  *
   5  * Copyright (C) 2001 Russell King
   6  *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
   7  */
   8 #ifndef _LINUX_CPUFREQ_H
   9 #define _LINUX_CPUFREQ_H
  10
  11 #include <linux/clk.h>
  12 #include <linux/cpu.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/completion.h>
  15 #include <linux/kobject.h>
  16 #include <linux/notifier.h>
  17 #include <linux/of.h>
  18 #include <linux/pm_opp.h>
  19 #include <linux/pm_qos.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/sysfs.h>
  22 #include <linux/minmax.h>
  23
  24 /*********************************************************************
  25  *                        CPUFREQ INTERFACE                          *
  26  *********************************************************************/
  27 /*
  28  * Frequency values here are CPU kHz
  29  *
  30  * Maximum transition latency is in nanoseconds - if it's unknown,
  31  * CPUFREQ_ETERNAL shall be used.
  32  */
  33
  34 #define CPUFREQ_ETERNAL                 (-1)
  35 #define CPUFREQ_NAME_LEN                16
  36 /* Print length for names. Extra 1 space for accommodating '\n' in prints */
  37 #define CPUFREQ_NAME_PLEN               (CPUFREQ_NAME_LEN + 1)
  38
  39 struct cpufreq_governor;
  40
  41 enum cpufreq_table_sorting {
  42         CPUFREQ_TABLE_UNSORTED,
  43         CPUFREQ_TABLE_SORTED_ASCENDING,
  44         CPUFREQ_TABLE_SORTED_DESCENDING
  45 };
  46
  47 struct cpufreq_cpuinfo {
  48         unsigned int            max_freq;
  49         unsigned int            min_freq;
  50
  51         /* in 10^(-9) s = nanoseconds */
  52         unsigned int            transition_latency;
  53 };
  54
  55 struct cpufreq_policy {
  56         /* CPUs sharing clock, require sw coordination */
  57         cpumask_var_t           cpus;   /* Online CPUs only */
  58         cpumask_var_t           related_cpus; /* Online + Offline CPUs */
  59         cpumask_var_t           real_cpus; /* Related and present */
  60
  61         unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
  62                                                 should set cpufreq */
  63         unsigned int            cpu;    /* cpu managing this policy, must be online */
  64
  65         struct clk              *clk;
  66         struct cpufreq_cpuinfo  cpuinfo;/* see above */
  67
  68         unsigned int            min;    /* in kHz */
  69         unsigned int            max;    /* in kHz */
  70         unsigned int            cur;    /* in kHz, only needed if cpufreq
  71                                          * governors are used */
  72         unsigned int            suspend_freq; /* freq to set during suspend */
  73
  74         unsigned int            policy; /* see above */
  75         unsigned int            last_policy; /* policy before unplug */
  76         struct cpufreq_governor *governor; /* see below */
  77         void                    *governor_data;
  78         char                    last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
  79
  80         struct work_struct      update; /* if update_policy() needs to be
  81                                          * called, but you're in IRQ context */
  82
  83         struct freq_constraints constraints;
  84         struct freq_qos_request *min_freq_req;
  85         struct freq_qos_request *max_freq_req;
  86
  87         struct cpufreq_frequency_table  *freq_table;
  88         enum cpufreq_table_sorting freq_table_sorted;
  89
  90         struct list_head        policy_list;
  91         struct kobject          kobj;
  92         struct completion       kobj_unregister;
  93
  94         /*
  95          * The rules for this semaphore:
  96          * - Any routine that wants to read from the policy structure will
  97          *   do a down_read on this semaphore.
  98          * - Any routine that will write to the policy structure and/or may take away
  99          *   the policy altogether (eg. CPU hotplug), will hold this lock in write
 100          *   mode before doing so.
 101          */
 102         struct rw_semaphore     rwsem;
 103
 104         /*
 105          * Fast switch flags:
 106          * - fast_switch_possible should be set by the driver if it can
 107          *   guarantee that frequency can be changed on any CPU sharing the
 108          *   policy and that the change will affect all of the policy CPUs then.
 109          * - fast_switch_enabled is to be set by governors that support fast
 110          *   frequency switching with the help of cpufreq_enable_fast_switch().
 111          */
 112         bool                    fast_switch_possible;
 113         bool                    fast_switch_enabled;
 114
 115         /*
 116          * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
 117          * governor.
 118          */
 119         bool                    strict_target;
 120
 121         /*
 122          * Set if inefficient frequencies were found in the frequency table.
 123          * This indicates if the relation flag CPUFREQ_RELATION_E can be
 124          * honored.
 125          */
 126         bool                    efficiencies_available;
 127
 128         /*
 129          * Preferred average time interval between consecutive invocations of
 130          * the driver to set the frequency for this policy.  To be set by the
 131          * scaling driver (0, which is the default, means no preference).
 132          */
 133         unsigned int            transition_delay_us;
 134
 135         /*
 136          * Remote DVFS flag (Not added to the driver structure as we don't want
 137          * to access another structure from scheduler hotpath).
 138          *
 139          * Should be set if CPUs can do DVFS on behalf of other CPUs from
 140          * different cpufreq policies.
 141          */
 142         bool                    dvfs_possible_from_any_cpu;
 143
 144         /* Per policy boost enabled flag. */
 145         bool                    boost_enabled;
 146
 147          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 148         unsigned int cached_target_freq;
 149         unsigned int cached_resolved_idx;
 150
 151         /* Synchronization for frequency transitions */
 152         bool                    transition_ongoing; /* Tracks transition status */
 153         spinlock_t              transition_lock;
 154         wait_queue_head_t       transition_wait;
 155         struct task_struct      *transition_task; /* Task which is doing the transition */
 156
 157         /* cpufreq-stats */
 158         struct cpufreq_stats    *stats;
 159
 160         /* For cpufreq driver's internal use */
 161         void                    *driver_data;
 162
 163         /* Pointer to the cooling device if used for thermal mitigation */
 164         struct thermal_cooling_device *cdev;
 165
 166         struct notifier_block nb_min;
 167         struct notifier_block nb_max;
 168 };
 169
 170 /*
 171  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 172  * callback for sanitization.  That callback is only expected to modify the min
 173  * and max values, if necessary, and specifically it must not update the
 174  * frequency table.
 175  */
 176 struct cpufreq_policy_data {
 177         struct cpufreq_cpuinfo          cpuinfo;
 178         struct cpufreq_frequency_table  *freq_table;
 179         unsigned int                    cpu;
 180         unsigned int                    min;    /* in kHz */
 181         unsigned int                    max;    /* in kHz */
 182 };
 183
 184 struct cpufreq_freqs {
 185         struct cpufreq_policy *policy;
 186         unsigned int old;
 187         unsigned int new;
 188         u8 flags;               /* flags of cpufreq_driver, see below. */
 189 };
 190
 191 /* Only for ACPI */
 192 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 193 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 194 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 195 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 196
 197 #ifdef CONFIG_CPU_FREQ
 198 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 199 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 200 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 201 #else
 202 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 203 {
 204         return NULL;
 205 }
 206 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 207 {
 208         return NULL;
 209 }
 210 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 211 #endif
 212
 213 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 214 {
 215         return cpumask_empty(policy->cpus);
 216 }
 217
 218 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 219 {
 220         return cpumask_weight(policy->cpus) > 1;
 221 }
 222
 223 #ifdef CONFIG_CPU_FREQ
 224 unsigned int cpufreq_get(unsigned int cpu);
 225 unsigned int cpufreq_quick_get(unsigned int cpu);
 226 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 227 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 228 void disable_cpufreq(void);
 229
 230 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 231
 232 struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
 233 void cpufreq_cpu_release(struct cpufreq_policy *policy);
 234 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 235 void refresh_frequency_limits(struct cpufreq_policy *policy);
 236 void cpufreq_update_policy(unsigned int cpu);
 237 void cpufreq_update_limits(unsigned int cpu);
 238 bool have_governor_per_policy(void);
 239 bool cpufreq_supports_freq_invariance(void);
 240 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 241 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 242 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 243 bool has_target_index(void);
 244
 245 DECLARE_PER_CPU(unsigned long, cpufreq_pressure);
 246 static inline unsigned long cpufreq_get_pressure(int cpu)
 247 {
 248         return READ_ONCE(per_cpu(cpufreq_pressure, cpu));
 249 }
 250 #else
 251 static inline unsigned int cpufreq_get(unsigned int cpu)
 252 {
 253         return 0;
 254 }
 255 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 256 {
 257         return 0;
 258 }
 259 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 260 {
 261         return 0;
 262 }
 263 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 264 {
 265         return 0;
 266 }
 267 static inline bool cpufreq_supports_freq_invariance(void)
 268 {
 269         return false;
 270 }
 271 static inline void disable_cpufreq(void) { }
 272 static inline void cpufreq_update_limits(unsigned int cpu) { }
 273 static inline unsigned long cpufreq_get_pressure(int cpu)
 274 {
 275         return 0;
 276 }
 277 #endif
 278
 279 #ifdef CONFIG_CPU_FREQ_STAT
 280 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 281 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 282 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 283                                      unsigned int new_freq);
 284 #else
 285 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 286 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 287 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 288                                                    unsigned int new_freq) { }
 289 #endif /* CONFIG_CPU_FREQ_STAT */
 290
 291 /*********************************************************************
 292  *                      CPUFREQ DRIVER INTERFACE                     *
 293  *********************************************************************/
 294
 295 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 296 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 297 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 298 /* relation flags */
 299 #define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */
 300
 301 #define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E)
 302 #define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E)
 303 #define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E)
 304
 305 struct freq_attr {
 306         struct attribute attr;
 307         ssize_t (*show)(struct cpufreq_policy *, char *);
 308         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 309 };
 310
 311 #define cpufreq_freq_attr_ro(_name)             \
 312 static struct freq_attr _name =                 \
 313 __ATTR(_name, 0444, show_##_name, NULL)
 314
 315 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 316 static struct freq_attr _name =                 \
 317 __ATTR(_name, _perm, show_##_name, NULL)
 318
 319 #define cpufreq_freq_attr_rw(_name)             \
 320 static struct freq_attr _name =                 \
 321 __ATTR(_name, 0644, show_##_name, store_##_name)
 322
 323 #define cpufreq_freq_attr_wo(_name)             \
 324 static struct freq_attr _name =                 \
 325 __ATTR(_name, 0200, NULL, store_##_name)
 326
 327 #define define_one_global_ro(_name)             \
 328 static struct kobj_attribute _name =            \
 329 __ATTR(_name, 0444, show_##_name, NULL)
 330
 331 #define define_one_global_rw(_name)             \
 332 static struct kobj_attribute _name =            \
 333 __ATTR(_name, 0644, show_##_name, store_##_name)
 334
 335
 336 struct cpufreq_driver {
 337         char            name[CPUFREQ_NAME_LEN];
 338         u16             flags;
 339         void            *driver_data;
 340
 341         /* needed by all drivers */
 342         int             (*init)(struct cpufreq_policy *policy);
 343         int             (*verify)(struct cpufreq_policy_data *policy);
 344
 345         /* define one out of two */
 346         int             (*setpolicy)(struct cpufreq_policy *policy);
 347
 348         int             (*target)(struct cpufreq_policy *policy,
 349                                   unsigned int target_freq,
 350                                   unsigned int relation);       /* Deprecated */
 351         int             (*target_index)(struct cpufreq_policy *policy,
 352                                         unsigned int index);
 353         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 354                                        unsigned int target_freq);
 355         /*
 356          * ->fast_switch() replacement for drivers that use an internal
 357          * representation of performance levels and can pass hints other than
 358          * the target performance level to the hardware. This can only be set
 359          * if ->fast_switch is set too, because in those cases (under specific
 360          * conditions) scale invariance can be disabled, which causes the
 361          * schedutil governor to fall back to the latter.
 362          */
 363         void            (*adjust_perf)(unsigned int cpu,
 364                                        unsigned long min_perf,
 365                                        unsigned long target_perf,
 366                                        unsigned long capacity);
 367
 368         /*
 369          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 370          * unset.
 371          *
 372          * get_intermediate should return a stable intermediate frequency
 373          * platform wants to switch to and target_intermediate() should set CPU
 374          * to that frequency, before jumping to the frequency corresponding
 375          * to 'index'. Core will take care of sending notifications and driver
 376          * doesn't have to handle them in target_intermediate() or
 377          * target_index().
 378          *
 379          * Drivers can return '0' from get_intermediate() in case they don't
 380          * wish to switch to intermediate frequency for some target frequency.
 381          * In that case core will directly call ->target_index().
 382          */
 383         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 384                                             unsigned int index);
 385         int             (*target_intermediate)(struct cpufreq_policy *policy,
 386                                                unsigned int index);
 387
 388         /* should be defined, if possible, return 0 on error */
 389         unsigned int    (*get)(unsigned int cpu);
 390
 391         /* Called to update policy limits on firmware notifications. */
 392         void            (*update_limits)(unsigned int cpu);
 393
 394         /* optional */
 395         int             (*bios_limit)(int cpu, unsigned int *limit);
 396
 397         int             (*online)(struct cpufreq_policy *policy);
 398         int             (*offline)(struct cpufreq_policy *policy);
 399         int             (*exit)(struct cpufreq_policy *policy);
 400         int             (*suspend)(struct cpufreq_policy *policy);
 401         int             (*resume)(struct cpufreq_policy *policy);
 402
 403         /* Will be called after the driver is fully initialized */
 404         void            (*ready)(struct cpufreq_policy *policy);
 405
 406         struct freq_attr **attr;
 407
 408         /* platform specific boost support code */
 409         bool            boost_enabled;
 410         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 411
 412         /*
 413          * Set by drivers that want to register with the energy model after the
 414          * policy is properly initialized, but before the governor is started.
 415          */
 416         void            (*register_em)(struct cpufreq_policy *policy);
 417 };
 418
 419 /* flags */
 420
 421 /*
 422  * Set by drivers that need to update internal upper and lower boundaries along
 423  * with the target frequency and so the core and governors should also invoke
 424  * the diver if the target frequency does not change, but the policy min or max
 425  * may have changed.
 426  */
 427 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 428
 429 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 430 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 431
 432 /*
 433  * Set by drivers that want the core to automatically register the cpufreq
 434  * driver as a thermal cooling device.
 435  */
 436 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 437
 438 /*
 439  * This should be set by platforms having multiple clock-domains, i.e.
 440  * supporting multiple policies. With this sysfs directories of governor would
 441  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 442  * governor with different tunables for different clusters.
 443  */
 444 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 445
 446 /*
 447  * Driver will do POSTCHANGE notifications from outside of their ->target()
 448  * routine and so must set cpufreq_driver->flags with this flag, so that core
 449  * can handle them specially.
 450  */
 451 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 452
 453 /*
 454  * Set by drivers which want cpufreq core to check if CPU is running at a
 455  * frequency present in freq-table exposed by the driver. For these drivers if
 456  * CPU is found running at an out of table freq, we will try to set it to a freq
 457  * from the table. And if that fails, we will stop further boot process by
 458  * issuing a BUG_ON().
 459  */
 460 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 461
 462 /*
 463  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 464  * set.
 465  */
 466 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 467
 468 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 469 void cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 470
 471 bool cpufreq_driver_test_flags(u16 flags);
 472 const char *cpufreq_get_current_driver(void);
 473 void *cpufreq_get_driver_data(void);
 474
 475 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 476 {
 477         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 478                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 479 }
 480
 481 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 482                                                 unsigned int min,
 483                                                 unsigned int max)
 484 {
 485         policy->max = clamp(policy->max, min, max);
 486         policy->min = clamp(policy->min, min, policy->max);
 487 }
 488
 489 static inline void
 490 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 491 {
 492         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 493                                      policy->cpuinfo.max_freq);
 494 }
 495
 496 #ifdef CONFIG_CPU_FREQ
 497 void cpufreq_suspend(void);
 498 void cpufreq_resume(void);
 499 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 500 #else
 501 static inline void cpufreq_suspend(void) {}
 502 static inline void cpufreq_resume(void) {}
 503 #endif
 504
 505 /*********************************************************************
 506  *                     CPUFREQ NOTIFIER INTERFACE                    *
 507  *********************************************************************/
 508
 509 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 510 #define CPUFREQ_POLICY_NOTIFIER         (1)
 511
 512 /* Transition notifiers */
 513 #define CPUFREQ_PRECHANGE               (0)
 514 #define CPUFREQ_POSTCHANGE              (1)
 515
 516 /* Policy Notifiers  */
 517 #define CPUFREQ_CREATE_POLICY           (0)
 518 #define CPUFREQ_REMOVE_POLICY           (1)
 519
 520 #ifdef CONFIG_CPU_FREQ
 521 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 522 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 523
 524 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 525                 struct cpufreq_freqs *freqs);
 526 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 527                 struct cpufreq_freqs *freqs, int transition_failed);
 528
 529 #else /* CONFIG_CPU_FREQ */
 530 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 531                                                 unsigned int list)
 532 {
 533         return 0;
 534 }
 535 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 536                                                 unsigned int list)
 537 {
 538         return 0;
 539 }
 540 #endif /* !CONFIG_CPU_FREQ */
 541
 542 /**
 543  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 544  * safe)
 545  * @old:   old value
 546  * @div:   divisor
 547  * @mult:  multiplier
 548  *
 549  *
 550  * new = old * mult / div
 551  */
 552 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 553                 u_int mult)
 554 {
 555 #if BITS_PER_LONG == 32
 556         u64 result = ((u64) old) * ((u64) mult);
 557         do_div(result, div);
 558         return (unsigned long) result;
 559
 560 #elif BITS_PER_LONG == 64
 561         unsigned long result = old * ((u64) mult);
 562         result /= div;
 563         return result;
 564 #endif
 565 }
 566
 567 /*********************************************************************
 568  *                          CPUFREQ GOVERNORS                        *
 569  *********************************************************************/
 570
 571 #define CPUFREQ_POLICY_UNKNOWN          (0)
 572 /*
 573  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 574  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 575  * two generic policies are available:
 576  */
 577 #define CPUFREQ_POLICY_POWERSAVE        (1)
 578 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 579
 580 /*
 581  * The polling frequency depends on the capability of the processor. Default
 582  * polling frequency is 1000 times the transition latency of the processor.
 583  */
 584 #define LATENCY_MULTIPLIER              (1000)
 585
 586 struct cpufreq_governor {
 587         char    name[CPUFREQ_NAME_LEN];
 588         int     (*init)(struct cpufreq_policy *policy);
 589         void    (*exit)(struct cpufreq_policy *policy);
 590         int     (*start)(struct cpufreq_policy *policy);
 591         void    (*stop)(struct cpufreq_policy *policy);
 592         void    (*limits)(struct cpufreq_policy *policy);
 593         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 594                                          char *buf);
 595         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 596                                          unsigned int freq);
 597         struct list_head        governor_list;
 598         struct module           *owner;
 599         u8                      flags;
 600 };
 601
 602 /* Governor flags */
 603
 604 /* For governors which change frequency dynamically by themselves */
 605 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 606
 607 /* For governors wanting the target frequency to be set exactly */
 608 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 609
 610
 611 /* Pass a target to the cpufreq driver */
 612 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 613                                         unsigned int target_freq);
 614 void cpufreq_driver_adjust_perf(unsigned int cpu,
 615                                 unsigned long min_perf,
 616                                 unsigned long target_perf,
 617                                 unsigned long capacity);
 618 bool cpufreq_driver_has_adjust_perf(void);
 619 int cpufreq_driver_target(struct cpufreq_policy *policy,
 620                                  unsigned int target_freq,
 621                                  unsigned int relation);
 622 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 623                                    unsigned int target_freq,
 624                                    unsigned int relation);
 625 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 626                                          unsigned int target_freq);
 627 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 628 int cpufreq_register_governor(struct cpufreq_governor *governor);
 629 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 630 int cpufreq_start_governor(struct cpufreq_policy *policy);
 631 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 632
 633 #define cpufreq_governor_init(__governor)                       \
 634 static int __init __governor##_init(void)                       \
 635 {                                                               \
 636         return cpufreq_register_governor(&__governor);  \
 637 }                                                               \
 638 core_initcall(__governor##_init)
 639
 640 #define cpufreq_governor_exit(__governor)                       \
 641 static void __exit __governor##_exit(void)                      \
 642 {                                                               \
 643         return cpufreq_unregister_governor(&__governor);        \
 644 }                                                               \
 645 module_exit(__governor##_exit)
 646
 647 struct cpufreq_governor *cpufreq_default_governor(void);
 648 struct cpufreq_governor *cpufreq_fallback_governor(void);
 649
 650 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 651 {
 652         if (policy->max < policy->cur)
 653                 __cpufreq_driver_target(policy, policy->max,
 654                                         CPUFREQ_RELATION_HE);
 655         else if (policy->min > policy->cur)
 656                 __cpufreq_driver_target(policy, policy->min,
 657                                         CPUFREQ_RELATION_LE);
 658 }
 659
 660 /* Governor attribute set */
 661 struct gov_attr_set {
 662         struct kobject kobj;
 663         struct list_head policy_list;
 664         struct mutex update_lock;
 665         int usage_count;
 666 };
 667
 668 /* sysfs ops for cpufreq governors */
 669 extern const struct sysfs_ops governor_sysfs_ops;
 670
 671 static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj)
 672 {
 673         return container_of(kobj, struct gov_attr_set, kobj);
 674 }
 675
 676 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 677 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 678 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 679
 680 /* Governor sysfs attribute */
 681 struct governor_attr {
 682         struct attribute attr;
 683         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 684         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 685                          size_t count);
 686 };
 687
 688 /*********************************************************************
 689  *                     FREQUENCY TABLE HELPERS                       *
 690  *********************************************************************/
 691
 692 /* Special Values of .frequency field */
 693 #define CPUFREQ_ENTRY_INVALID           ~0u
 694 #define CPUFREQ_TABLE_END               ~1u
 695 /* Special Values of .flags field */
 696 #define CPUFREQ_BOOST_FREQ              (1 << 0)
 697 #define CPUFREQ_INEFFICIENT_FREQ        (1 << 1)
 698
 699 struct cpufreq_frequency_table {
 700         unsigned int    flags;
 701         unsigned int    driver_data; /* driver specific data, not used by core */
 702         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 703                                     * order */
 704 };
 705
 706 /*
 707  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 708  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 709  * @table:      the cpufreq_frequency_table * to iterate over.
 710  */
 711
 712 #define cpufreq_for_each_entry(pos, table)      \
 713         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 714
 715 /*
 716  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 717  *      with index
 718  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 719  * @table:      the cpufreq_frequency_table * to iterate over.
 720  * @idx:        the table entry currently being processed
 721  */
 722
 723 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 724         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 725                 pos++, idx++)
 726
 727 /*
 728  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 729  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 730  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 731  * @table:      the cpufreq_frequency_table * to iterate over.
 732  */
 733
 734 #define cpufreq_for_each_valid_entry(pos, table)                        \
 735         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 736                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 737                         continue;                                       \
 738                 else
 739
 740 /*
 741  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 742  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 743  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 744  * @table:      the cpufreq_frequency_table * to iterate over.
 745  * @idx:        the table entry currently being processed
 746  */
 747
 748 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 749         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 750                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 751                         continue;                                       \
 752                 else
 753
 754 /**
 755  * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq
 756  *      frequency_table excluding CPUFREQ_ENTRY_INVALID and
 757  *      CPUFREQ_INEFFICIENT_FREQ frequencies.
 758  * @pos: the &struct cpufreq_frequency_table to use as a loop cursor.
 759  * @table: the &struct cpufreq_frequency_table to iterate over.
 760  * @idx: the table entry currently being processed.
 761  * @efficiencies: set to true to only iterate over efficient frequencies.
 762  */
 763
 764 #define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies)     \
 765         cpufreq_for_each_valid_entry_idx(pos, table, idx)                       \
 766                 if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ))    \
 767                         continue;                                               \
 768                 else
 769
 770
 771 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 772                                     struct cpufreq_frequency_table *table);
 773
 774 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 775                                    struct cpufreq_frequency_table *table);
 776 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 777
 778 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 779                                  unsigned int target_freq,
 780                                  unsigned int relation);
 781 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 782                 unsigned int freq);
 783
 784 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 785
 786 #ifdef CONFIG_CPU_FREQ
 787 int cpufreq_boost_trigger_state(int state);
 788 int cpufreq_boost_enabled(void);
 789 int cpufreq_enable_boost_support(void);
 790 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 791
 792 /* Find lowest freq at or above target in a table in ascending order */
 793 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 794                                               unsigned int target_freq,
 795                                               bool efficiencies)
 796 {
 797         struct cpufreq_frequency_table *table = policy->freq_table;
 798         struct cpufreq_frequency_table *pos;
 799         unsigned int freq;
 800         int idx, best = -1;
 801
 802         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 803                 freq = pos->frequency;
 804
 805                 if (freq >= target_freq)
 806                         return idx;
 807
 808                 best = idx;
 809         }
 810
 811         return best;
 812 }
 813
 814 /* Find lowest freq at or above target in a table in descending order */
 815 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 816                                               unsigned int target_freq,
 817                                               bool efficiencies)
 818 {
 819         struct cpufreq_frequency_table *table = policy->freq_table;
 820         struct cpufreq_frequency_table *pos;
 821         unsigned int freq;
 822         int idx, best = -1;
 823
 824         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 825                 freq = pos->frequency;
 826
 827                 if (freq == target_freq)
 828                         return idx;
 829
 830                 if (freq > target_freq) {
 831                         best = idx;
 832                         continue;
 833                 }
 834
 835                 /* No freq found above target_freq */
 836                 if (best == -1)
 837                         return idx;
 838
 839                 return best;
 840         }
 841
 842         return best;
 843 }
 844
 845 /* Works only on sorted freq-tables */
 846 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 847                                              unsigned int target_freq,
 848                                              bool efficiencies)
 849 {
 850         target_freq = clamp_val(target_freq, policy->min, policy->max);
 851
 852         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 853                 return cpufreq_table_find_index_al(policy, target_freq,
 854                                                    efficiencies);
 855         else
 856                 return cpufreq_table_find_index_dl(policy, target_freq,
 857                                                    efficiencies);
 858 }
 859
 860 /* Find highest freq at or below target in a table in ascending order */
 861 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 862                                               unsigned int target_freq,
 863                                               bool efficiencies)
 864 {
 865         struct cpufreq_frequency_table *table = policy->freq_table;
 866         struct cpufreq_frequency_table *pos;
 867         unsigned int freq;
 868         int idx, best = -1;
 869
 870         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 871                 freq = pos->frequency;
 872
 873                 if (freq == target_freq)
 874                         return idx;
 875
 876                 if (freq < target_freq) {
 877                         best = idx;
 878                         continue;
 879                 }
 880
 881                 /* No freq found below target_freq */
 882                 if (best == -1)
 883                         return idx;
 884
 885                 return best;
 886         }
 887
 888         return best;
 889 }
 890
 891 /* Find highest freq at or below target in a table in descending order */
 892 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 893                                               unsigned int target_freq,
 894                                               bool efficiencies)
 895 {
 896         struct cpufreq_frequency_table *table = policy->freq_table;
 897         struct cpufreq_frequency_table *pos;
 898         unsigned int freq;
 899         int idx, best = -1;
 900
 901         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 902                 freq = pos->frequency;
 903
 904                 if (freq <= target_freq)
 905                         return idx;
 906
 907                 best = idx;
 908         }
 909
 910         return best;
 911 }
 912
 913 /* Works only on sorted freq-tables */
 914 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 915                                              unsigned int target_freq,
 916                                              bool efficiencies)
 917 {
 918         target_freq = clamp_val(target_freq, policy->min, policy->max);
 919
 920         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 921                 return cpufreq_table_find_index_ah(policy, target_freq,
 922                                                    efficiencies);
 923         else
 924                 return cpufreq_table_find_index_dh(policy, target_freq,
 925                                                    efficiencies);
 926 }
 927
 928 /* Find closest freq to target in a table in ascending order */
 929 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 930                                               unsigned int target_freq,
 931                                               bool efficiencies)
 932 {
 933         struct cpufreq_frequency_table *table = policy->freq_table;
 934         struct cpufreq_frequency_table *pos;
 935         unsigned int freq;
 936         int idx, best = -1;
 937
 938         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 939                 freq = pos->frequency;
 940
 941                 if (freq == target_freq)
 942                         return idx;
 943
 944                 if (freq < target_freq) {
 945                         best = idx;
 946                         continue;
 947                 }
 948
 949                 /* No freq found below target_freq */
 950                 if (best == -1)
 951                         return idx;
 952
 953                 /* Choose the closest freq */
 954                 if (target_freq - table[best].frequency > freq - target_freq)
 955                         return idx;
 956
 957                 return best;
 958         }
 959
 960         return best;
 961 }
 962
 963 /* Find closest freq to target in a table in descending order */
 964 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 965                                               unsigned int target_freq,
 966                                               bool efficiencies)
 967 {
 968         struct cpufreq_frequency_table *table = policy->freq_table;
 969         struct cpufreq_frequency_table *pos;
 970         unsigned int freq;
 971         int idx, best = -1;
 972
 973         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 974                 freq = pos->frequency;
 975
 976                 if (freq == target_freq)
 977                         return idx;
 978
 979                 if (freq > target_freq) {
 980                         best = idx;
 981                         continue;
 982                 }
 983
 984                 /* No freq found above target_freq */
 985                 if (best == -1)
 986                         return idx;
 987
 988                 /* Choose the closest freq */
 989                 if (table[best].frequency - target_freq > target_freq - freq)
 990                         return idx;
 991
 992                 return best;
 993         }
 994
 995         return best;
 996 }
 997
 998 /* Works only on sorted freq-tables */
 999 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
1000                                              unsigned int target_freq,
1001                                              bool efficiencies)
1002 {
1003         target_freq = clamp_val(target_freq, policy->min, policy->max);
1004
1005         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
1006                 return cpufreq_table_find_index_ac(policy, target_freq,
1007                                                    efficiencies);
1008         else
1009                 return cpufreq_table_find_index_dc(policy, target_freq,
1010                                                    efficiencies);
1011 }
1012
1013 static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy, int idx)
1014 {
1015         unsigned int freq;
1016
1017         if (idx < 0)
1018                 return false;
1019
1020         freq = policy->freq_table[idx].frequency;
1021
1022         return freq == clamp_val(freq, policy->min, policy->max);
1023 }
1024
1025 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
1026                                                  unsigned int target_freq,
1027                                                  unsigned int relation)
1028 {
1029         bool efficiencies = policy->efficiencies_available &&
1030                             (relation & CPUFREQ_RELATION_E);
1031         int idx;
1032
1033         /* cpufreq_table_index_unsorted() has no use for this flag anyway */
1034         relation &= ~CPUFREQ_RELATION_E;
1035
1036         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
1037                 return cpufreq_table_index_unsorted(policy, target_freq,
1038                                                     relation);
1039 retry:
1040         switch (relation) {
1041         case CPUFREQ_RELATION_L:
1042                 idx = cpufreq_table_find_index_l(policy, target_freq,
1043                                                  efficiencies);
1044                 break;
1045         case CPUFREQ_RELATION_H:
1046                 idx = cpufreq_table_find_index_h(policy, target_freq,
1047                                                  efficiencies);
1048                 break;
1049         case CPUFREQ_RELATION_C:
1050                 idx = cpufreq_table_find_index_c(policy, target_freq,
1051                                                  efficiencies);
1052                 break;
1053         default:
1054                 WARN_ON_ONCE(1);
1055                 return 0;
1056         }
1057
1058         /* Limit frequency index to honor policy->min/max */
1059         if (!cpufreq_is_in_limits(policy, idx) && efficiencies) {
1060                 efficiencies = false;
1061                 goto retry;
1062         }
1063
1064         return idx;
1065 }
1066
1067 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
1068 {
1069         struct cpufreq_frequency_table *pos;
1070         int count = 0;
1071
1072         if (unlikely(!policy->freq_table))
1073                 return 0;
1074
1075         cpufreq_for_each_valid_entry(pos, policy->freq_table)
1076                 count++;
1077
1078         return count;
1079 }
1080
1081 /**
1082  * cpufreq_table_set_inefficient() - Mark a frequency as inefficient
1083  * @policy:     the &struct cpufreq_policy containing the inefficient frequency
1084  * @frequency:  the inefficient frequency
1085  *
1086  * The &struct cpufreq_policy must use a sorted frequency table
1087  *
1088  * Return:      %0 on success or a negative errno code
1089  */
1090
1091 static inline int
1092 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1093                               unsigned int frequency)
1094 {
1095         struct cpufreq_frequency_table *pos;
1096
1097         /* Not supported */
1098         if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
1099                 return -EINVAL;
1100
1101         cpufreq_for_each_valid_entry(pos, policy->freq_table) {
1102                 if (pos->frequency == frequency) {
1103                         pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
1104                         policy->efficiencies_available = true;
1105                         return 0;
1106                 }
1107         }
1108
1109         return -EINVAL;
1110 }
1111
1112 static inline int parse_perf_domain(int cpu, const char *list_name,
1113                                     const char *cell_name,
1114                                     struct of_phandle_args *args)
1115 {
1116         struct device_node *cpu_np;
1117         int ret;
1118
1119         cpu_np = of_cpu_device_node_get(cpu);
1120         if (!cpu_np)
1121                 return -ENODEV;
1122
1123         ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
1124                                          args);
1125         if (ret < 0)
1126                 return ret;
1127
1128         of_node_put(cpu_np);
1129
1130         return 0;
1131 }
1132
1133 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1134                                                      const char *cell_name, struct cpumask *cpumask,
1135                                                      struct of_phandle_args *pargs)
1136 {
1137         int cpu, ret;
1138         struct of_phandle_args args;
1139
1140         ret = parse_perf_domain(pcpu, list_name, cell_name, pargs);
1141         if (ret < 0)
1142                 return ret;
1143
1144         cpumask_set_cpu(pcpu, cpumask);
1145
1146         for_each_possible_cpu(cpu) {
1147                 if (cpu == pcpu)
1148                         continue;
1149
1150                 ret = parse_perf_domain(cpu, list_name, cell_name, &args);
1151                 if (ret < 0)
1152                         continue;
1153
1154                 if (of_phandle_args_equal(pargs, &args))
1155                         cpumask_set_cpu(cpu, cpumask);
1156
1157                 of_node_put(args.np);
1158         }
1159
1160         return 0;
1161 }
1162 #else
1163 static inline int cpufreq_boost_trigger_state(int state)
1164 {
1165         return 0;
1166 }
1167 static inline int cpufreq_boost_enabled(void)
1168 {
1169         return 0;
1170 }
1171
1172 static inline int cpufreq_enable_boost_support(void)
1173 {
1174         return -EINVAL;
1175 }
1176
1177 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1178 {
1179         return false;
1180 }
1181
1182 static inline int
1183 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1184                               unsigned int frequency)
1185 {
1186         return -EINVAL;
1187 }
1188
1189 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1190                                                      const char *cell_name, struct cpumask *cpumask,
1191                                                      struct of_phandle_args *pargs)
1192 {
1193         return -EOPNOTSUPP;
1194 }
1195 #endif
1196
1197 extern unsigned int arch_freq_get_on_cpu(int cpu);
1198
1199 #ifndef arch_set_freq_scale
1200 static __always_inline
1201 void arch_set_freq_scale(const struct cpumask *cpus,
1202                          unsigned long cur_freq,
1203                          unsigned long max_freq)
1204 {
1205 }
1206 #endif
1207
1208 /* the following are really really optional */
1209 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1210 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1211 extern struct freq_attr *cpufreq_generic_attr[];
1212 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1213
1214 unsigned int cpufreq_generic_get(unsigned int cpu);
1215 void cpufreq_generic_init(struct cpufreq_policy *policy,
1216                 struct cpufreq_frequency_table *table,
1217                 unsigned int transition_latency);
1218
1219 static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
1220 {
1221         dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
1222                                   policy->related_cpus);
1223 }
1224 #endif /* _LINUX_CPUFREQ_H */