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 <[email protected]>
   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          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 145         unsigned int cached_target_freq;
 146         unsigned int cached_resolved_idx;
 147
 148         /* Synchronization for frequency transitions */
 149         bool                    transition_ongoing; /* Tracks transition status */
 150         spinlock_t              transition_lock;
 151         wait_queue_head_t       transition_wait;
 152         struct task_struct      *transition_task; /* Task which is doing the transition */
 153
 154         /* cpufreq-stats */
 155         struct cpufreq_stats    *stats;
 156
 157         /* For cpufreq driver's internal use */
 158         void                    *driver_data;
 159
 160         /* Pointer to the cooling device if used for thermal mitigation */
 161         struct thermal_cooling_device *cdev;
 162
 163         struct notifier_block nb_min;
 164         struct notifier_block nb_max;
 165 };
 166
 167 /*
 168  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 169  * callback for sanitization.  That callback is only expected to modify the min
 170  * and max values, if necessary, and specifically it must not update the
 171  * frequency table.
 172  */
 173 struct cpufreq_policy_data {
 174         struct cpufreq_cpuinfo          cpuinfo;
 175         struct cpufreq_frequency_table  *freq_table;
 176         unsigned int                    cpu;
 177         unsigned int                    min;    /* in kHz */
 178         unsigned int                    max;    /* in kHz */
 179 };
 180
 181 struct cpufreq_freqs {
 182         struct cpufreq_policy *policy;
 183         unsigned int old;
 184         unsigned int new;
 185         u8 flags;               /* flags of cpufreq_driver, see below. */
 186 };
 187
 188 /* Only for ACPI */
 189 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 190 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 191 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 192 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 193
 194 #ifdef CONFIG_CPU_FREQ
 195 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 196 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 197 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 198 #else
 199 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 200 {
 201         return NULL;
 202 }
 203 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 204 {
 205         return NULL;
 206 }
 207 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 208 #endif
 209
 210 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 211 {
 212         return cpumask_empty(policy->cpus);
 213 }
 214
 215 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 216 {
 217         return cpumask_weight(policy->cpus) > 1;
 218 }
 219
 220 #ifdef CONFIG_CPU_FREQ
 221 unsigned int cpufreq_get(unsigned int cpu);
 222 unsigned int cpufreq_quick_get(unsigned int cpu);
 223 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 224 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 225 void disable_cpufreq(void);
 226
 227 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 228
 229 struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu);
 230 void cpufreq_cpu_release(struct cpufreq_policy *policy);
 231 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
 232 void refresh_frequency_limits(struct cpufreq_policy *policy);
 233 void cpufreq_update_policy(unsigned int cpu);
 234 void cpufreq_update_limits(unsigned int cpu);
 235 bool have_governor_per_policy(void);
 236 bool cpufreq_supports_freq_invariance(void);
 237 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 238 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 239 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 240 bool has_target_index(void);
 241 #else
 242 static inline unsigned int cpufreq_get(unsigned int cpu)
 243 {
 244         return 0;
 245 }
 246 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 247 {
 248         return 0;
 249 }
 250 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 251 {
 252         return 0;
 253 }
 254 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 255 {
 256         return 0;
 257 }
 258 static inline bool cpufreq_supports_freq_invariance(void)
 259 {
 260         return false;
 261 }
 262 static inline void disable_cpufreq(void) { }
 263 #endif
 264
 265 #ifdef CONFIG_CPU_FREQ_STAT
 266 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 267 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 268 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 269                                      unsigned int new_freq);
 270 #else
 271 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 272 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 273 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 274                                                    unsigned int new_freq) { }
 275 #endif /* CONFIG_CPU_FREQ_STAT */
 276
 277 /*********************************************************************
 278  *                      CPUFREQ DRIVER INTERFACE                     *
 279  *********************************************************************/
 280
 281 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 282 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 283 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 284 /* relation flags */
 285 #define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */
 286
 287 #define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E)
 288 #define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E)
 289 #define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E)
 290
 291 struct freq_attr {
 292         struct attribute attr;
 293         ssize_t (*show)(struct cpufreq_policy *, char *);
 294         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 295 };
 296
 297 #define cpufreq_freq_attr_ro(_name)             \
 298 static struct freq_attr _name =                 \
 299 __ATTR(_name, 0444, show_##_name, NULL)
 300
 301 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 302 static struct freq_attr _name =                 \
 303 __ATTR(_name, _perm, show_##_name, NULL)
 304
 305 #define cpufreq_freq_attr_rw(_name)             \
 306 static struct freq_attr _name =                 \
 307 __ATTR(_name, 0644, show_##_name, store_##_name)
 308
 309 #define cpufreq_freq_attr_wo(_name)             \
 310 static struct freq_attr _name =                 \
 311 __ATTR(_name, 0200, NULL, store_##_name)
 312
 313 #define define_one_global_ro(_name)             \
 314 static struct kobj_attribute _name =            \
 315 __ATTR(_name, 0444, show_##_name, NULL)
 316
 317 #define define_one_global_rw(_name)             \
 318 static struct kobj_attribute _name =            \
 319 __ATTR(_name, 0644, show_##_name, store_##_name)
 320
 321
 322 struct cpufreq_driver {
 323         char            name[CPUFREQ_NAME_LEN];
 324         u16             flags;
 325         void            *driver_data;
 326
 327         /* needed by all drivers */
 328         int             (*init)(struct cpufreq_policy *policy);
 329         int             (*verify)(struct cpufreq_policy_data *policy);
 330
 331         /* define one out of two */
 332         int             (*setpolicy)(struct cpufreq_policy *policy);
 333
 334         int             (*target)(struct cpufreq_policy *policy,
 335                                   unsigned int target_freq,
 336                                   unsigned int relation);       /* Deprecated */
 337         int             (*target_index)(struct cpufreq_policy *policy,
 338                                         unsigned int index);
 339         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 340                                        unsigned int target_freq);
 341         /*
 342          * ->fast_switch() replacement for drivers that use an internal
 343          * representation of performance levels and can pass hints other than
 344          * the target performance level to the hardware. This can only be set
 345          * if ->fast_switch is set too, because in those cases (under specific
 346          * conditions) scale invariance can be disabled, which causes the
 347          * schedutil governor to fall back to the latter.
 348          */
 349         void            (*adjust_perf)(unsigned int cpu,
 350                                        unsigned long min_perf,
 351                                        unsigned long target_perf,
 352                                        unsigned long capacity);
 353
 354         /*
 355          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 356          * unset.
 357          *
 358          * get_intermediate should return a stable intermediate frequency
 359          * platform wants to switch to and target_intermediate() should set CPU
 360          * to that frequency, before jumping to the frequency corresponding
 361          * to 'index'. Core will take care of sending notifications and driver
 362          * doesn't have to handle them in target_intermediate() or
 363          * target_index().
 364          *
 365          * Drivers can return '0' from get_intermediate() in case they don't
 366          * wish to switch to intermediate frequency for some target frequency.
 367          * In that case core will directly call ->target_index().
 368          */
 369         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 370                                             unsigned int index);
 371         int             (*target_intermediate)(struct cpufreq_policy *policy,
 372                                                unsigned int index);
 373
 374         /* should be defined, if possible, return 0 on error */
 375         unsigned int    (*get)(unsigned int cpu);
 376
 377         /* Called to update policy limits on firmware notifications. */
 378         void            (*update_limits)(unsigned int cpu);
 379
 380         /* optional */
 381         int             (*bios_limit)(int cpu, unsigned int *limit);
 382
 383         int             (*online)(struct cpufreq_policy *policy);
 384         int             (*offline)(struct cpufreq_policy *policy);
 385         int             (*exit)(struct cpufreq_policy *policy);
 386         int             (*suspend)(struct cpufreq_policy *policy);
 387         int             (*resume)(struct cpufreq_policy *policy);
 388
 389         /* Will be called after the driver is fully initialized */
 390         void            (*ready)(struct cpufreq_policy *policy);
 391
 392         struct freq_attr **attr;
 393
 394         /* platform specific boost support code */
 395         bool            boost_enabled;
 396         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 397
 398         /*
 399          * Set by drivers that want to register with the energy model after the
 400          * policy is properly initialized, but before the governor is started.
 401          */
 402         void            (*register_em)(struct cpufreq_policy *policy);
 403 };
 404
 405 /* flags */
 406
 407 /*
 408  * Set by drivers that need to update internal upper and lower boundaries along
 409  * with the target frequency and so the core and governors should also invoke
 410  * the diver if the target frequency does not change, but the policy min or max
 411  * may have changed.
 412  */
 413 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 414
 415 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 416 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 417
 418 /*
 419  * Set by drivers that want the core to automatically register the cpufreq
 420  * driver as a thermal cooling device.
 421  */
 422 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 423
 424 /*
 425  * This should be set by platforms having multiple clock-domains, i.e.
 426  * supporting multiple policies. With this sysfs directories of governor would
 427  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 428  * governor with different tunables for different clusters.
 429  */
 430 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 431
 432 /*
 433  * Driver will do POSTCHANGE notifications from outside of their ->target()
 434  * routine and so must set cpufreq_driver->flags with this flag, so that core
 435  * can handle them specially.
 436  */
 437 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 438
 439 /*
 440  * Set by drivers which want cpufreq core to check if CPU is running at a
 441  * frequency present in freq-table exposed by the driver. For these drivers if
 442  * CPU is found running at an out of table freq, we will try to set it to a freq
 443  * from the table. And if that fails, we will stop further boot process by
 444  * issuing a BUG_ON().
 445  */
 446 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 447
 448 /*
 449  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 450  * set.
 451  */
 452 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 453
 454 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 455 void cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 456
 457 bool cpufreq_driver_test_flags(u16 flags);
 458 const char *cpufreq_get_current_driver(void);
 459 void *cpufreq_get_driver_data(void);
 460
 461 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 462 {
 463         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 464                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 465 }
 466
 467 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 468                                                 unsigned int min,
 469                                                 unsigned int max)
 470 {
 471         policy->max = clamp(policy->max, min, max);
 472         policy->min = clamp(policy->min, min, policy->max);
 473 }
 474
 475 static inline void
 476 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 477 {
 478         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 479                                      policy->cpuinfo.max_freq);
 480 }
 481
 482 #ifdef CONFIG_CPU_FREQ
 483 void cpufreq_suspend(void);
 484 void cpufreq_resume(void);
 485 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 486 #else
 487 static inline void cpufreq_suspend(void) {}
 488 static inline void cpufreq_resume(void) {}
 489 #endif
 490
 491 /*********************************************************************
 492  *                     CPUFREQ NOTIFIER INTERFACE                    *
 493  *********************************************************************/
 494
 495 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 496 #define CPUFREQ_POLICY_NOTIFIER         (1)
 497
 498 /* Transition notifiers */
 499 #define CPUFREQ_PRECHANGE               (0)
 500 #define CPUFREQ_POSTCHANGE              (1)
 501
 502 /* Policy Notifiers  */
 503 #define CPUFREQ_CREATE_POLICY           (0)
 504 #define CPUFREQ_REMOVE_POLICY           (1)
 505
 506 #ifdef CONFIG_CPU_FREQ
 507 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 508 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 509
 510 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 511                 struct cpufreq_freqs *freqs);
 512 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 513                 struct cpufreq_freqs *freqs, int transition_failed);
 514
 515 #else /* CONFIG_CPU_FREQ */
 516 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 517                                                 unsigned int list)
 518 {
 519         return 0;
 520 }
 521 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 522                                                 unsigned int list)
 523 {
 524         return 0;
 525 }
 526 #endif /* !CONFIG_CPU_FREQ */
 527
 528 /**
 529  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 530  * safe)
 531  * @old:   old value
 532  * @div:   divisor
 533  * @mult:  multiplier
 534  *
 535  *
 536  * new = old * mult / div
 537  */
 538 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 539                 u_int mult)
 540 {
 541 #if BITS_PER_LONG == 32
 542         u64 result = ((u64) old) * ((u64) mult);
 543         do_div(result, div);
 544         return (unsigned long) result;
 545
 546 #elif BITS_PER_LONG == 64
 547         unsigned long result = old * ((u64) mult);
 548         result /= div;
 549         return result;
 550 #endif
 551 }
 552
 553 /*********************************************************************
 554  *                          CPUFREQ GOVERNORS                        *
 555  *********************************************************************/
 556
 557 #define CPUFREQ_POLICY_UNKNOWN          (0)
 558 /*
 559  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 560  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 561  * two generic policies are available:
 562  */
 563 #define CPUFREQ_POLICY_POWERSAVE        (1)
 564 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 565
 566 /*
 567  * The polling frequency depends on the capability of the processor. Default
 568  * polling frequency is 1000 times the transition latency of the processor. The
 569  * ondemand governor will work on any processor with transition latency <= 10ms,
 570  * using appropriate sampling rate.
 571  */
 572 #define LATENCY_MULTIPLIER              (1000)
 573
 574 struct cpufreq_governor {
 575         char    name[CPUFREQ_NAME_LEN];
 576         int     (*init)(struct cpufreq_policy *policy);
 577         void    (*exit)(struct cpufreq_policy *policy);
 578         int     (*start)(struct cpufreq_policy *policy);
 579         void    (*stop)(struct cpufreq_policy *policy);
 580         void    (*limits)(struct cpufreq_policy *policy);
 581         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 582                                          char *buf);
 583         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 584                                          unsigned int freq);
 585         struct list_head        governor_list;
 586         struct module           *owner;
 587         u8                      flags;
 588 };
 589
 590 /* Governor flags */
 591
 592 /* For governors which change frequency dynamically by themselves */
 593 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 594
 595 /* For governors wanting the target frequency to be set exactly */
 596 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 597
 598
 599 /* Pass a target to the cpufreq driver */
 600 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 601                                         unsigned int target_freq);
 602 void cpufreq_driver_adjust_perf(unsigned int cpu,
 603                                 unsigned long min_perf,
 604                                 unsigned long target_perf,
 605                                 unsigned long capacity);
 606 bool cpufreq_driver_has_adjust_perf(void);
 607 int cpufreq_driver_target(struct cpufreq_policy *policy,
 608                                  unsigned int target_freq,
 609                                  unsigned int relation);
 610 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 611                                    unsigned int target_freq,
 612                                    unsigned int relation);
 613 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 614                                          unsigned int target_freq);
 615 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 616 int cpufreq_register_governor(struct cpufreq_governor *governor);
 617 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 618 int cpufreq_start_governor(struct cpufreq_policy *policy);
 619 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 620
 621 #define cpufreq_governor_init(__governor)                       \
 622 static int __init __governor##_init(void)                       \
 623 {                                                               \
 624         return cpufreq_register_governor(&__governor);  \
 625 }                                                               \
 626 core_initcall(__governor##_init)
 627
 628 #define cpufreq_governor_exit(__governor)                       \
 629 static void __exit __governor##_exit(void)                      \
 630 {                                                               \
 631         return cpufreq_unregister_governor(&__governor);        \
 632 }                                                               \
 633 module_exit(__governor##_exit)
 634
 635 struct cpufreq_governor *cpufreq_default_governor(void);
 636 struct cpufreq_governor *cpufreq_fallback_governor(void);
 637
 638 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 639 {
 640         if (policy->max < policy->cur)
 641                 __cpufreq_driver_target(policy, policy->max,
 642                                         CPUFREQ_RELATION_HE);
 643         else if (policy->min > policy->cur)
 644                 __cpufreq_driver_target(policy, policy->min,
 645                                         CPUFREQ_RELATION_LE);
 646 }
 647
 648 /* Governor attribute set */
 649 struct gov_attr_set {
 650         struct kobject kobj;
 651         struct list_head policy_list;
 652         struct mutex update_lock;
 653         int usage_count;
 654 };
 655
 656 /* sysfs ops for cpufreq governors */
 657 extern const struct sysfs_ops governor_sysfs_ops;
 658
 659 static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj)
 660 {
 661         return container_of(kobj, struct gov_attr_set, kobj);
 662 }
 663
 664 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 665 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 666 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 667
 668 /* Governor sysfs attribute */
 669 struct governor_attr {
 670         struct attribute attr;
 671         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 672         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 673                          size_t count);
 674 };
 675
 676 /*********************************************************************
 677  *                     FREQUENCY TABLE HELPERS                       *
 678  *********************************************************************/
 679
 680 /* Special Values of .frequency field */
 681 #define CPUFREQ_ENTRY_INVALID           ~0u
 682 #define CPUFREQ_TABLE_END               ~1u
 683 /* Special Values of .flags field */
 684 #define CPUFREQ_BOOST_FREQ              (1 << 0)
 685 #define CPUFREQ_INEFFICIENT_FREQ        (1 << 1)
 686
 687 struct cpufreq_frequency_table {
 688         unsigned int    flags;
 689         unsigned int    driver_data; /* driver specific data, not used by core */
 690         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 691                                     * order */
 692 };
 693
 694 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 695 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 696                                   struct cpufreq_frequency_table **table);
 697 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 698                                    struct cpufreq_frequency_table **table);
 699 #else
 700 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 701                                                 struct cpufreq_frequency_table
 702                                                 **table)
 703 {
 704         return -EINVAL;
 705 }
 706
 707 static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
 708                                                  struct cpufreq_frequency_table
 709                                                  **table)
 710 {
 711 }
 712 #endif
 713
 714 /*
 715  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 716  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 717  * @table:      the cpufreq_frequency_table * to iterate over.
 718  */
 719
 720 #define cpufreq_for_each_entry(pos, table)      \
 721         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 722
 723 /*
 724  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 725  *      with index
 726  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 727  * @table:      the cpufreq_frequency_table * to iterate over.
 728  * @idx:        the table entry currently being processed
 729  */
 730
 731 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 732         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 733                 pos++, idx++)
 734
 735 /*
 736  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 737  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 738  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 739  * @table:      the cpufreq_frequency_table * to iterate over.
 740  */
 741
 742 #define cpufreq_for_each_valid_entry(pos, table)                        \
 743         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 744                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 745                         continue;                                       \
 746                 else
 747
 748 /*
 749  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 750  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 751  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 752  * @table:      the cpufreq_frequency_table * to iterate over.
 753  * @idx:        the table entry currently being processed
 754  */
 755
 756 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 757         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 758                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 759                         continue;                                       \
 760                 else
 761
 762 /**
 763  * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq
 764  *      frequency_table excluding CPUFREQ_ENTRY_INVALID and
 765  *      CPUFREQ_INEFFICIENT_FREQ frequencies.
 766  * @pos: the &struct cpufreq_frequency_table to use as a loop cursor.
 767  * @table: the &struct cpufreq_frequency_table to iterate over.
 768  * @idx: the table entry currently being processed.
 769  * @efficiencies: set to true to only iterate over efficient frequencies.
 770  */
 771
 772 #define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies)     \
 773         cpufreq_for_each_valid_entry_idx(pos, table, idx)                       \
 774                 if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ))    \
 775                         continue;                                               \
 776                 else
 777
 778
 779 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 780                                     struct cpufreq_frequency_table *table);
 781
 782 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 783                                    struct cpufreq_frequency_table *table);
 784 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 785
 786 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 787                                  unsigned int target_freq,
 788                                  unsigned int relation);
 789 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 790                 unsigned int freq);
 791
 792 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 793
 794 #ifdef CONFIG_CPU_FREQ
 795 int cpufreq_boost_trigger_state(int state);
 796 int cpufreq_boost_enabled(void);
 797 int cpufreq_enable_boost_support(void);
 798 bool policy_has_boost_freq(struct cpufreq_policy *policy);
 799
 800 /* Find lowest freq at or above target in a table in ascending order */
 801 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 802                                               unsigned int target_freq,
 803                                               bool efficiencies)
 804 {
 805         struct cpufreq_frequency_table *table = policy->freq_table;
 806         struct cpufreq_frequency_table *pos;
 807         unsigned int freq;
 808         int idx, best = -1;
 809
 810         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 811                 freq = pos->frequency;
 812
 813                 if (freq >= target_freq)
 814                         return idx;
 815
 816                 best = idx;
 817         }
 818
 819         return best;
 820 }
 821
 822 /* Find lowest freq at or above target in a table in descending order */
 823 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 824                                               unsigned int target_freq,
 825                                               bool efficiencies)
 826 {
 827         struct cpufreq_frequency_table *table = policy->freq_table;
 828         struct cpufreq_frequency_table *pos;
 829         unsigned int freq;
 830         int idx, best = -1;
 831
 832         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 833                 freq = pos->frequency;
 834
 835                 if (freq == target_freq)
 836                         return idx;
 837
 838                 if (freq > target_freq) {
 839                         best = idx;
 840                         continue;
 841                 }
 842
 843                 /* No freq found above target_freq */
 844                 if (best == -1)
 845                         return idx;
 846
 847                 return best;
 848         }
 849
 850         return best;
 851 }
 852
 853 /* Works only on sorted freq-tables */
 854 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 855                                              unsigned int target_freq,
 856                                              bool efficiencies)
 857 {
 858         target_freq = clamp_val(target_freq, policy->min, policy->max);
 859
 860         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 861                 return cpufreq_table_find_index_al(policy, target_freq,
 862                                                    efficiencies);
 863         else
 864                 return cpufreq_table_find_index_dl(policy, target_freq,
 865                                                    efficiencies);
 866 }
 867
 868 /* Find highest freq at or below target in a table in ascending order */
 869 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 870                                               unsigned int target_freq,
 871                                               bool efficiencies)
 872 {
 873         struct cpufreq_frequency_table *table = policy->freq_table;
 874         struct cpufreq_frequency_table *pos;
 875         unsigned int freq;
 876         int idx, best = -1;
 877
 878         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 879                 freq = pos->frequency;
 880
 881                 if (freq == target_freq)
 882                         return idx;
 883
 884                 if (freq < target_freq) {
 885                         best = idx;
 886                         continue;
 887                 }
 888
 889                 /* No freq found below target_freq */
 890                 if (best == -1)
 891                         return idx;
 892
 893                 return best;
 894         }
 895
 896         return best;
 897 }
 898
 899 /* Find highest freq at or below target in a table in descending order */
 900 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 901                                               unsigned int target_freq,
 902                                               bool efficiencies)
 903 {
 904         struct cpufreq_frequency_table *table = policy->freq_table;
 905         struct cpufreq_frequency_table *pos;
 906         unsigned int freq;
 907         int idx, best = -1;
 908
 909         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 910                 freq = pos->frequency;
 911
 912                 if (freq <= target_freq)
 913                         return idx;
 914
 915                 best = idx;
 916         }
 917
 918         return best;
 919 }
 920
 921 /* Works only on sorted freq-tables */
 922 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 923                                              unsigned int target_freq,
 924                                              bool efficiencies)
 925 {
 926         target_freq = clamp_val(target_freq, policy->min, policy->max);
 927
 928         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 929                 return cpufreq_table_find_index_ah(policy, target_freq,
 930                                                    efficiencies);
 931         else
 932                 return cpufreq_table_find_index_dh(policy, target_freq,
 933                                                    efficiencies);
 934 }
 935
 936 /* Find closest freq to target in a table in ascending order */
 937 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 938                                               unsigned int target_freq,
 939                                               bool efficiencies)
 940 {
 941         struct cpufreq_frequency_table *table = policy->freq_table;
 942         struct cpufreq_frequency_table *pos;
 943         unsigned int freq;
 944         int idx, best = -1;
 945
 946         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 947                 freq = pos->frequency;
 948
 949                 if (freq == target_freq)
 950                         return idx;
 951
 952                 if (freq < target_freq) {
 953                         best = idx;
 954                         continue;
 955                 }
 956
 957                 /* No freq found below target_freq */
 958                 if (best == -1)
 959                         return idx;
 960
 961                 /* Choose the closest freq */
 962                 if (target_freq - table[best].frequency > freq - target_freq)
 963                         return idx;
 964
 965                 return best;
 966         }
 967
 968         return best;
 969 }
 970
 971 /* Find closest freq to target in a table in descending order */
 972 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 973                                               unsigned int target_freq,
 974                                               bool efficiencies)
 975 {
 976         struct cpufreq_frequency_table *table = policy->freq_table;
 977         struct cpufreq_frequency_table *pos;
 978         unsigned int freq;
 979         int idx, best = -1;
 980
 981         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 982                 freq = pos->frequency;
 983
 984                 if (freq == target_freq)
 985                         return idx;
 986
 987                 if (freq > target_freq) {
 988                         best = idx;
 989                         continue;
 990                 }
 991
 992                 /* No freq found above target_freq */
 993                 if (best == -1)
 994                         return idx;
 995
 996                 /* Choose the closest freq */
 997                 if (table[best].frequency - target_freq > target_freq - freq)
 998                         return idx;
 999
1000                 return best;
1001         }
1002
1003         return best;
1004 }
1005
1006 /* Works only on sorted freq-tables */
1007 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
1008                                              unsigned int target_freq,
1009                                              bool efficiencies)
1010 {
1011         target_freq = clamp_val(target_freq, policy->min, policy->max);
1012
1013         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
1014                 return cpufreq_table_find_index_ac(policy, target_freq,
1015                                                    efficiencies);
1016         else
1017                 return cpufreq_table_find_index_dc(policy, target_freq,
1018                                                    efficiencies);
1019 }
1020
1021 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
1022                                                  unsigned int target_freq,
1023                                                  unsigned int relation)
1024 {
1025         bool efficiencies = policy->efficiencies_available &&
1026                             (relation & CPUFREQ_RELATION_E);
1027         int idx;
1028
1029         /* cpufreq_table_index_unsorted() has no use for this flag anyway */
1030         relation &= ~CPUFREQ_RELATION_E;
1031
1032         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
1033                 return cpufreq_table_index_unsorted(policy, target_freq,
1034                                                     relation);
1035 retry:
1036         switch (relation) {
1037         case CPUFREQ_RELATION_L:
1038                 idx = cpufreq_table_find_index_l(policy, target_freq,
1039                                                  efficiencies);
1040                 break;
1041         case CPUFREQ_RELATION_H:
1042                 idx = cpufreq_table_find_index_h(policy, target_freq,
1043                                                  efficiencies);
1044                 break;
1045         case CPUFREQ_RELATION_C:
1046                 idx = cpufreq_table_find_index_c(policy, target_freq,
1047                                                  efficiencies);
1048                 break;
1049         default:
1050                 WARN_ON_ONCE(1);
1051                 return 0;
1052         }
1053
1054         if (idx < 0 && efficiencies) {
1055                 efficiencies = false;
1056                 goto retry;
1057         }
1058
1059         return idx;
1060 }
1061
1062 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
1063 {
1064         struct cpufreq_frequency_table *pos;
1065         int count = 0;
1066
1067         if (unlikely(!policy->freq_table))
1068                 return 0;
1069
1070         cpufreq_for_each_valid_entry(pos, policy->freq_table)
1071                 count++;
1072
1073         return count;
1074 }
1075
1076 /**
1077  * cpufreq_table_set_inefficient() - Mark a frequency as inefficient
1078  * @policy:     the &struct cpufreq_policy containing the inefficient frequency
1079  * @frequency:  the inefficient frequency
1080  *
1081  * The &struct cpufreq_policy must use a sorted frequency table
1082  *
1083  * Return:      %0 on success or a negative errno code
1084  */
1085
1086 static inline int
1087 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1088                               unsigned int frequency)
1089 {
1090         struct cpufreq_frequency_table *pos;
1091
1092         /* Not supported */
1093         if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
1094                 return -EINVAL;
1095
1096         cpufreq_for_each_valid_entry(pos, policy->freq_table) {
1097                 if (pos->frequency == frequency) {
1098                         pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
1099                         policy->efficiencies_available = true;
1100                         return 0;
1101                 }
1102         }
1103
1104         return -EINVAL;
1105 }
1106
1107 static inline int parse_perf_domain(int cpu, const char *list_name,
1108                                     const char *cell_name,
1109                                     struct of_phandle_args *args)
1110 {
1111         struct device_node *cpu_np;
1112         int ret;
1113
1114         cpu_np = of_cpu_device_node_get(cpu);
1115         if (!cpu_np)
1116                 return -ENODEV;
1117
1118         ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
1119                                          args);
1120         if (ret < 0)
1121                 return ret;
1122
1123         of_node_put(cpu_np);
1124
1125         return 0;
1126 }
1127
1128 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1129                                                      const char *cell_name, struct cpumask *cpumask,
1130                                                      struct of_phandle_args *pargs)
1131 {
1132         int cpu, ret;
1133         struct of_phandle_args args;
1134
1135         ret = parse_perf_domain(pcpu, list_name, cell_name, pargs);
1136         if (ret < 0)
1137                 return ret;
1138
1139         cpumask_set_cpu(pcpu, cpumask);
1140
1141         for_each_possible_cpu(cpu) {
1142                 if (cpu == pcpu)
1143                         continue;
1144
1145                 ret = parse_perf_domain(cpu, list_name, cell_name, &args);
1146                 if (ret < 0)
1147                         continue;
1148
1149                 if (pargs->np == args.np && pargs->args_count == args.args_count &&
1150                     !memcmp(pargs->args, args.args, sizeof(args.args[0]) * args.args_count))
1151                         cpumask_set_cpu(cpu, cpumask);
1152
1153                 of_node_put(args.np);
1154         }
1155
1156         return 0;
1157 }
1158 #else
1159 static inline int cpufreq_boost_trigger_state(int state)
1160 {
1161         return 0;
1162 }
1163 static inline int cpufreq_boost_enabled(void)
1164 {
1165         return 0;
1166 }
1167
1168 static inline int cpufreq_enable_boost_support(void)
1169 {
1170         return -EINVAL;
1171 }
1172
1173 static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
1174 {
1175         return false;
1176 }
1177
1178 static inline int
1179 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1180                               unsigned int frequency)
1181 {
1182         return -EINVAL;
1183 }
1184
1185 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1186                                                      const char *cell_name, struct cpumask *cpumask,
1187                                                      struct of_phandle_args *pargs)
1188 {
1189         return -EOPNOTSUPP;
1190 }
1191 #endif
1192
1193 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1194 void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1195                         struct cpufreq_governor *old_gov);
1196 #else
1197 static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
1198                         struct cpufreq_governor *old_gov) { }
1199 #endif
1200
1201 extern unsigned int arch_freq_get_on_cpu(int cpu);
1202
1203 #ifndef arch_set_freq_scale
1204 static __always_inline
1205 void arch_set_freq_scale(const struct cpumask *cpus,
1206                          unsigned long cur_freq,
1207                          unsigned long max_freq)
1208 {
1209 }
1210 #endif
1211 /* the following are really really optional */
1212 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1213 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1214 extern struct freq_attr *cpufreq_generic_attr[];
1215 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1216
1217 unsigned int cpufreq_generic_get(unsigned int cpu);
1218 void cpufreq_generic_init(struct cpufreq_policy *policy,
1219                 struct cpufreq_frequency_table *table,
1220                 unsigned int transition_latency);
1221
1222 static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
1223 {
1224         dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
1225                                   policy->related_cpus);
1226 }
1227 #endif /* _LINUX_CPUFREQ_H */