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