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         /* Per policy boost supported flag. */
 148         bool                    boost_supported;
 149
 150          /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
 151         unsigned int cached_target_freq;
 152         unsigned int cached_resolved_idx;
 153
 154         /* Synchronization for frequency transitions */
 155         bool                    transition_ongoing; /* Tracks transition status */
 156         spinlock_t              transition_lock;
 157         wait_queue_head_t       transition_wait;
 158         struct task_struct      *transition_task; /* Task which is doing the transition */
 159
 160         /* cpufreq-stats */
 161         struct cpufreq_stats    *stats;
 162
 163         /* For cpufreq driver's internal use */
 164         void                    *driver_data;
 165
 166         /* Pointer to the cooling device if used for thermal mitigation */
 167         struct thermal_cooling_device *cdev;
 168
 169         struct notifier_block nb_min;
 170         struct notifier_block nb_max;
 171 };
 172
 173 DEFINE_GUARD(cpufreq_policy_write, struct cpufreq_policy *,
 174              down_write(&_T->rwsem), up_write(&_T->rwsem))
 175
 176 DEFINE_GUARD(cpufreq_policy_read, struct cpufreq_policy *,
 177              down_read(&_T->rwsem), up_read(&_T->rwsem))
 178
 179 /*
 180  * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
 181  * callback for sanitization.  That callback is only expected to modify the min
 182  * and max values, if necessary, and specifically it must not update the
 183  * frequency table.
 184  */
 185 struct cpufreq_policy_data {
 186         struct cpufreq_cpuinfo          cpuinfo;
 187         struct cpufreq_frequency_table  *freq_table;
 188         unsigned int                    cpu;
 189         unsigned int                    min;    /* in kHz */
 190         unsigned int                    max;    /* in kHz */
 191 };
 192
 193 struct cpufreq_freqs {
 194         struct cpufreq_policy *policy;
 195         unsigned int old;
 196         unsigned int new;
 197         u8 flags;               /* flags of cpufreq_driver, see below. */
 198 };
 199
 200 /* Only for ACPI */
 201 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
 202 #define CPUFREQ_SHARED_TYPE_HW   (1) /* HW does needed coordination */
 203 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 204 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 205
 206 #ifdef CONFIG_CPU_FREQ
 207 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
 208 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 209 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 210 #else
 211 static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 212 {
 213         return NULL;
 214 }
 215 static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 216 {
 217         return NULL;
 218 }
 219 static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
 220 #endif
 221
 222 /* Scope based cleanup macro for cpufreq_policy kobject reference counting */
 223 DEFINE_FREE(put_cpufreq_policy, struct cpufreq_policy *, if (_T) cpufreq_cpu_put(_T))
 224
 225 static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 226 {
 227         return cpumask_empty(policy->cpus);
 228 }
 229
 230 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 231 {
 232         return cpumask_weight(policy->cpus) > 1;
 233 }
 234
 235 #ifdef CONFIG_CPU_FREQ
 236 unsigned int cpufreq_get(unsigned int cpu);
 237 unsigned int cpufreq_quick_get(unsigned int cpu);
 238 unsigned int cpufreq_quick_get_max(unsigned int cpu);
 239 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu);
 240 void disable_cpufreq(void);
 241
 242 u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
 243
 244 void refresh_frequency_limits(struct cpufreq_policy *policy);
 245 void cpufreq_update_policy(unsigned int cpu);
 246 void cpufreq_update_limits(unsigned int cpu);
 247 bool have_governor_per_policy(void);
 248 bool cpufreq_supports_freq_invariance(void);
 249 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 250 void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
 251 void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
 252 bool has_target_index(void);
 253
 254 DECLARE_PER_CPU(unsigned long, cpufreq_pressure);
 255 static inline unsigned long cpufreq_get_pressure(int cpu)
 256 {
 257         return READ_ONCE(per_cpu(cpufreq_pressure, cpu));
 258 }
 259 #else
 260 static inline unsigned int cpufreq_get(unsigned int cpu)
 261 {
 262         return 0;
 263 }
 264 static inline unsigned int cpufreq_quick_get(unsigned int cpu)
 265 {
 266         return 0;
 267 }
 268 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
 269 {
 270         return 0;
 271 }
 272 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
 273 {
 274         return 0;
 275 }
 276 static inline bool cpufreq_supports_freq_invariance(void)
 277 {
 278         return false;
 279 }
 280 static inline void disable_cpufreq(void) { }
 281 static inline void cpufreq_update_limits(unsigned int cpu) { }
 282 static inline unsigned long cpufreq_get_pressure(int cpu)
 283 {
 284         return 0;
 285 }
 286 #endif
 287
 288 #ifdef CONFIG_CPU_FREQ_STAT
 289 void cpufreq_stats_create_table(struct cpufreq_policy *policy);
 290 void cpufreq_stats_free_table(struct cpufreq_policy *policy);
 291 void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 292                                      unsigned int new_freq);
 293 #else
 294 static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
 295 static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
 296 static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
 297                                                    unsigned int new_freq) { }
 298 #endif /* CONFIG_CPU_FREQ_STAT */
 299
 300 /*********************************************************************
 301  *                      CPUFREQ DRIVER INTERFACE                     *
 302  *********************************************************************/
 303
 304 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 305 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
 306 #define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 307 /* relation flags */
 308 #define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */
 309
 310 #define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E)
 311 #define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E)
 312 #define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E)
 313
 314 struct freq_attr {
 315         struct attribute attr;
 316         ssize_t (*show)(struct cpufreq_policy *, char *);
 317         ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 318 };
 319
 320 #define cpufreq_freq_attr_ro(_name)             \
 321 static struct freq_attr _name =                 \
 322 __ATTR(_name, 0444, show_##_name, NULL)
 323
 324 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
 325 static struct freq_attr _name =                 \
 326 __ATTR(_name, _perm, show_##_name, NULL)
 327
 328 #define cpufreq_freq_attr_rw(_name)             \
 329 static struct freq_attr _name =                 \
 330 __ATTR(_name, 0644, show_##_name, store_##_name)
 331
 332 #define cpufreq_freq_attr_wo(_name)             \
 333 static struct freq_attr _name =                 \
 334 __ATTR(_name, 0200, NULL, store_##_name)
 335
 336 #define define_one_global_ro(_name)             \
 337 static struct kobj_attribute _name =            \
 338 __ATTR(_name, 0444, show_##_name, NULL)
 339
 340 #define define_one_global_rw(_name)             \
 341 static struct kobj_attribute _name =            \
 342 __ATTR(_name, 0644, show_##_name, store_##_name)
 343
 344
 345 struct cpufreq_driver {
 346         char            name[CPUFREQ_NAME_LEN];
 347         u16             flags;
 348         void            *driver_data;
 349
 350         /* needed by all drivers */
 351         int             (*init)(struct cpufreq_policy *policy);
 352         int             (*verify)(struct cpufreq_policy_data *policy);
 353
 354         /* define one out of two */
 355         int             (*setpolicy)(struct cpufreq_policy *policy);
 356
 357         int             (*target)(struct cpufreq_policy *policy,
 358                                   unsigned int target_freq,
 359                                   unsigned int relation);       /* Deprecated */
 360         int             (*target_index)(struct cpufreq_policy *policy,
 361                                         unsigned int index);
 362         unsigned int    (*fast_switch)(struct cpufreq_policy *policy,
 363                                        unsigned int target_freq);
 364         /*
 365          * ->fast_switch() replacement for drivers that use an internal
 366          * representation of performance levels and can pass hints other than
 367          * the target performance level to the hardware. This can only be set
 368          * if ->fast_switch is set too, because in those cases (under specific
 369          * conditions) scale invariance can be disabled, which causes the
 370          * schedutil governor to fall back to the latter.
 371          */
 372         void            (*adjust_perf)(unsigned int cpu,
 373                                        unsigned long min_perf,
 374                                        unsigned long target_perf,
 375                                        unsigned long capacity);
 376
 377         /*
 378          * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
 379          * unset.
 380          *
 381          * get_intermediate should return a stable intermediate frequency
 382          * platform wants to switch to and target_intermediate() should set CPU
 383          * to that frequency, before jumping to the frequency corresponding
 384          * to 'index'. Core will take care of sending notifications and driver
 385          * doesn't have to handle them in target_intermediate() or
 386          * target_index().
 387          *
 388          * Drivers can return '0' from get_intermediate() in case they don't
 389          * wish to switch to intermediate frequency for some target frequency.
 390          * In that case core will directly call ->target_index().
 391          */
 392         unsigned int    (*get_intermediate)(struct cpufreq_policy *policy,
 393                                             unsigned int index);
 394         int             (*target_intermediate)(struct cpufreq_policy *policy,
 395                                                unsigned int index);
 396
 397         /* should be defined, if possible, return 0 on error */
 398         unsigned int    (*get)(unsigned int cpu);
 399
 400         /* Called to update policy limits on firmware notifications. */
 401         void            (*update_limits)(struct cpufreq_policy *policy);
 402
 403         /* optional */
 404         int             (*bios_limit)(int cpu, unsigned int *limit);
 405
 406         int             (*online)(struct cpufreq_policy *policy);
 407         int             (*offline)(struct cpufreq_policy *policy);
 408         void            (*exit)(struct cpufreq_policy *policy);
 409         int             (*suspend)(struct cpufreq_policy *policy);
 410         int             (*resume)(struct cpufreq_policy *policy);
 411
 412         /* Will be called after the driver is fully initialized */
 413         void            (*ready)(struct cpufreq_policy *policy);
 414
 415         struct freq_attr **attr;
 416
 417         /* platform specific boost support code */
 418         bool            boost_enabled;
 419         int             (*set_boost)(struct cpufreq_policy *policy, int state);
 420
 421         /*
 422          * Set by drivers that want to register with the energy model after the
 423          * policy is properly initialized, but before the governor is started.
 424          */
 425         void            (*register_em)(struct cpufreq_policy *policy);
 426 };
 427
 428 /* flags */
 429
 430 /*
 431  * Set by drivers that need to update internal upper and lower boundaries along
 432  * with the target frequency and so the core and governors should also invoke
 433  * the diver if the target frequency does not change, but the policy min or max
 434  * may have changed.
 435  */
 436 #define CPUFREQ_NEED_UPDATE_LIMITS              BIT(0)
 437
 438 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
 439 #define CPUFREQ_CONST_LOOPS                     BIT(1)
 440
 441 /*
 442  * Set by drivers that want the core to automatically register the cpufreq
 443  * driver as a thermal cooling device.
 444  */
 445 #define CPUFREQ_IS_COOLING_DEV                  BIT(2)
 446
 447 /*
 448  * This should be set by platforms having multiple clock-domains, i.e.
 449  * supporting multiple policies. With this sysfs directories of governor would
 450  * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 451  * governor with different tunables for different clusters.
 452  */
 453 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY        BIT(3)
 454
 455 /*
 456  * Driver will do POSTCHANGE notifications from outside of their ->target()
 457  * routine and so must set cpufreq_driver->flags with this flag, so that core
 458  * can handle them specially.
 459  */
 460 #define CPUFREQ_ASYNC_NOTIFICATION              BIT(4)
 461
 462 /*
 463  * Set by drivers which want cpufreq core to check if CPU is running at a
 464  * frequency present in freq-table exposed by the driver. For these drivers if
 465  * CPU is found running at an out of table freq, we will try to set it to a freq
 466  * from the table. And if that fails, we will stop further boot process by
 467  * issuing a BUG_ON().
 468  */
 469 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
 470
 471 /*
 472  * Set by drivers to disallow use of governors with "dynamic_switching" flag
 473  * set.
 474  */
 475 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING       BIT(6)
 476
 477 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 478 void cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 479
 480 bool cpufreq_driver_test_flags(u16 flags);
 481 const char *cpufreq_get_current_driver(void);
 482 void *cpufreq_get_driver_data(void);
 483
 484 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
 485 {
 486         return IS_ENABLED(CONFIG_CPU_THERMAL) &&
 487                 (drv->flags & CPUFREQ_IS_COOLING_DEV);
 488 }
 489
 490 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy,
 491                                                 unsigned int min,
 492                                                 unsigned int max)
 493 {
 494         policy->max = clamp(policy->max, min, max);
 495         policy->min = clamp(policy->min, min, policy->max);
 496 }
 497
 498 static inline void
 499 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy)
 500 {
 501         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
 502                                      policy->cpuinfo.max_freq);
 503 }
 504
 505 #ifdef CONFIG_CPU_FREQ
 506 void cpufreq_suspend(void);
 507 void cpufreq_resume(void);
 508 int cpufreq_generic_suspend(struct cpufreq_policy *policy);
 509 #else
 510 static inline void cpufreq_suspend(void) {}
 511 static inline void cpufreq_resume(void) {}
 512 #endif
 513
 514 /*********************************************************************
 515  *                     CPUFREQ NOTIFIER INTERFACE                    *
 516  *********************************************************************/
 517
 518 #define CPUFREQ_TRANSITION_NOTIFIER     (0)
 519 #define CPUFREQ_POLICY_NOTIFIER         (1)
 520
 521 /* Transition notifiers */
 522 #define CPUFREQ_PRECHANGE               (0)
 523 #define CPUFREQ_POSTCHANGE              (1)
 524
 525 /* Policy Notifiers  */
 526 #define CPUFREQ_CREATE_POLICY           (0)
 527 #define CPUFREQ_REMOVE_POLICY           (1)
 528
 529 #ifdef CONFIG_CPU_FREQ
 530 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
 531 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
 532
 533 void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
 534                 struct cpufreq_freqs *freqs);
 535 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
 536                 struct cpufreq_freqs *freqs, int transition_failed);
 537
 538 #else /* CONFIG_CPU_FREQ */
 539 static inline int cpufreq_register_notifier(struct notifier_block *nb,
 540                                                 unsigned int list)
 541 {
 542         return 0;
 543 }
 544 static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 545                                                 unsigned int list)
 546 {
 547         return 0;
 548 }
 549 #endif /* !CONFIG_CPU_FREQ */
 550
 551 /**
 552  * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 553  * safe)
 554  * @old:   old value
 555  * @div:   divisor
 556  * @mult:  multiplier
 557  *
 558  *
 559  * new = old * mult / div
 560  */
 561 static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
 562                 u_int mult)
 563 {
 564 #if BITS_PER_LONG == 32
 565         u64 result = ((u64) old) * ((u64) mult);
 566         do_div(result, div);
 567         return (unsigned long) result;
 568
 569 #elif BITS_PER_LONG == 64
 570         unsigned long result = old * ((u64) mult);
 571         result /= div;
 572         return result;
 573 #endif
 574 }
 575
 576 /*********************************************************************
 577  *                          CPUFREQ GOVERNORS                        *
 578  *********************************************************************/
 579
 580 #define CPUFREQ_POLICY_UNKNOWN          (0)
 581 /*
 582  * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 583  * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 584  * two generic policies are available:
 585  */
 586 #define CPUFREQ_POLICY_POWERSAVE        (1)
 587 #define CPUFREQ_POLICY_PERFORMANCE      (2)
 588
 589 struct cpufreq_governor {
 590         char    name[CPUFREQ_NAME_LEN];
 591         int     (*init)(struct cpufreq_policy *policy);
 592         void    (*exit)(struct cpufreq_policy *policy);
 593         int     (*start)(struct cpufreq_policy *policy);
 594         void    (*stop)(struct cpufreq_policy *policy);
 595         void    (*limits)(struct cpufreq_policy *policy);
 596         ssize_t (*show_setspeed)        (struct cpufreq_policy *policy,
 597                                          char *buf);
 598         int     (*store_setspeed)       (struct cpufreq_policy *policy,
 599                                          unsigned int freq);
 600         struct list_head        governor_list;
 601         struct module           *owner;
 602         u8                      flags;
 603 };
 604
 605 /* Governor flags */
 606
 607 /* For governors which change frequency dynamically by themselves */
 608 #define CPUFREQ_GOV_DYNAMIC_SWITCHING   BIT(0)
 609
 610 /* For governors wanting the target frequency to be set exactly */
 611 #define CPUFREQ_GOV_STRICT_TARGET       BIT(1)
 612
 613
 614 /* Pass a target to the cpufreq driver */
 615 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
 616                                         unsigned int target_freq);
 617 void cpufreq_driver_adjust_perf(unsigned int cpu,
 618                                 unsigned long min_perf,
 619                                 unsigned long target_perf,
 620                                 unsigned long capacity);
 621 bool cpufreq_driver_has_adjust_perf(void);
 622 int cpufreq_driver_target(struct cpufreq_policy *policy,
 623                                  unsigned int target_freq,
 624                                  unsigned int relation);
 625 int __cpufreq_driver_target(struct cpufreq_policy *policy,
 626                                    unsigned int target_freq,
 627                                    unsigned int relation);
 628 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
 629                                          unsigned int target_freq);
 630 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
 631 int cpufreq_register_governor(struct cpufreq_governor *governor);
 632 void cpufreq_unregister_governor(struct cpufreq_governor *governor);
 633 int cpufreq_start_governor(struct cpufreq_policy *policy);
 634 void cpufreq_stop_governor(struct cpufreq_policy *policy);
 635
 636 #define cpufreq_governor_init(__governor)                       \
 637 static int __init __governor##_init(void)                       \
 638 {                                                               \
 639         return cpufreq_register_governor(&__governor);  \
 640 }                                                               \
 641 core_initcall(__governor##_init)
 642
 643 #define cpufreq_governor_exit(__governor)                       \
 644 static void __exit __governor##_exit(void)                      \
 645 {                                                               \
 646         return cpufreq_unregister_governor(&__governor);        \
 647 }                                                               \
 648 module_exit(__governor##_exit)
 649
 650 struct cpufreq_governor *cpufreq_default_governor(void);
 651 struct cpufreq_governor *cpufreq_fallback_governor(void);
 652
 653 #ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
 654 bool sugov_is_governor(struct cpufreq_policy *policy);
 655 #else
 656 static inline bool sugov_is_governor(struct cpufreq_policy *policy)
 657 {
 658         return false;
 659 }
 660 #endif
 661
 662 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
 663 {
 664         if (policy->max < policy->cur)
 665                 __cpufreq_driver_target(policy, policy->max,
 666                                         CPUFREQ_RELATION_HE);
 667         else if (policy->min > policy->cur)
 668                 __cpufreq_driver_target(policy, policy->min,
 669                                         CPUFREQ_RELATION_LE);
 670 }
 671
 672 /* Governor attribute set */
 673 struct gov_attr_set {
 674         struct kobject kobj;
 675         struct list_head policy_list;
 676         struct mutex update_lock;
 677         int usage_count;
 678 };
 679
 680 /* sysfs ops for cpufreq governors */
 681 extern const struct sysfs_ops governor_sysfs_ops;
 682
 683 static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj)
 684 {
 685         return container_of(kobj, struct gov_attr_set, kobj);
 686 }
 687
 688 void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
 689 void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
 690 unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
 691
 692 /* Governor sysfs attribute */
 693 struct governor_attr {
 694         struct attribute attr;
 695         ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
 696         ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
 697                          size_t count);
 698 };
 699
 700 /*********************************************************************
 701  *                     FREQUENCY TABLE HELPERS                       *
 702  *********************************************************************/
 703
 704 /* Special Values of .frequency field */
 705 #define CPUFREQ_ENTRY_INVALID           ~0u
 706 #define CPUFREQ_TABLE_END               ~1u
 707 /* Special Values of .flags field */
 708 #define CPUFREQ_BOOST_FREQ              (1 << 0)
 709 #define CPUFREQ_INEFFICIENT_FREQ        (1 << 1)
 710
 711 struct cpufreq_frequency_table {
 712         unsigned int    flags;
 713         unsigned int    driver_data; /* driver specific data, not used by core */
 714         unsigned int    frequency; /* kHz - doesn't need to be in ascending
 715                                     * order */
 716 };
 717
 718 /*
 719  * cpufreq_for_each_entry -     iterate over a cpufreq_frequency_table
 720  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 721  * @table:      the cpufreq_frequency_table * to iterate over.
 722  */
 723
 724 #define cpufreq_for_each_entry(pos, table)      \
 725         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
 726
 727 /*
 728  * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
 729  *      with index
 730  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 731  * @table:      the cpufreq_frequency_table * to iterate over.
 732  * @idx:        the table entry currently being processed
 733  */
 734
 735 #define cpufreq_for_each_entry_idx(pos, table, idx)     \
 736         for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
 737                 pos++, idx++)
 738
 739 /*
 740  * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 741  *      excluding CPUFREQ_ENTRY_INVALID frequencies.
 742  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 743  * @table:      the cpufreq_frequency_table * to iterate over.
 744  */
 745
 746 #define cpufreq_for_each_valid_entry(pos, table)                        \
 747         for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)   \
 748                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 749                         continue;                                       \
 750                 else
 751
 752 /*
 753  * cpufreq_for_each_valid_entry_idx -     iterate with index over a cpufreq
 754  *      frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
 755  * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 756  * @table:      the cpufreq_frequency_table * to iterate over.
 757  * @idx:        the table entry currently being processed
 758  */
 759
 760 #define cpufreq_for_each_valid_entry_idx(pos, table, idx)               \
 761         cpufreq_for_each_entry_idx(pos, table, idx)                     \
 762                 if (pos->frequency == CPUFREQ_ENTRY_INVALID)            \
 763                         continue;                                       \
 764                 else
 765
 766 /**
 767  * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq
 768  *      frequency_table excluding CPUFREQ_ENTRY_INVALID and
 769  *      CPUFREQ_INEFFICIENT_FREQ frequencies.
 770  * @pos: the &struct cpufreq_frequency_table to use as a loop cursor.
 771  * @table: the &struct cpufreq_frequency_table to iterate over.
 772  * @idx: the table entry currently being processed.
 773  * @efficiencies: set to true to only iterate over efficient frequencies.
 774  */
 775
 776 #define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies)     \
 777         cpufreq_for_each_valid_entry_idx(pos, table, idx)                       \
 778                 if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ))    \
 779                         continue;                                               \
 780                 else
 781
 782
 783 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 784                                     struct cpufreq_frequency_table *table);
 785
 786 int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy,
 787                                    struct cpufreq_frequency_table *table);
 788 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy);
 789
 790 int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
 791                                  unsigned int target_freq, unsigned int min,
 792                                  unsigned int max, unsigned int relation);
 793 int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
 794                 unsigned int freq);
 795
 796 ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
 797
 798 #ifdef CONFIG_CPU_FREQ
 799 bool cpufreq_boost_enabled(void);
 800 int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state);
 801
 802 /* Find lowest freq at or above target in a table in ascending order */
 803 static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
 804                                               unsigned int target_freq,
 805                                               bool efficiencies)
 806 {
 807         struct cpufreq_frequency_table *table = policy->freq_table;
 808         struct cpufreq_frequency_table *pos;
 809         unsigned int freq;
 810         int idx, best = -1;
 811
 812         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 813                 freq = pos->frequency;
 814
 815                 if (freq >= target_freq)
 816                         return idx;
 817
 818                 best = idx;
 819         }
 820
 821         return best;
 822 }
 823
 824 /* Find lowest freq at or above target in a table in descending order */
 825 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
 826                                               unsigned int target_freq,
 827                                               bool efficiencies)
 828 {
 829         struct cpufreq_frequency_table *table = policy->freq_table;
 830         struct cpufreq_frequency_table *pos;
 831         unsigned int freq;
 832         int idx, best = -1;
 833
 834         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 835                 freq = pos->frequency;
 836
 837                 if (freq == target_freq)
 838                         return idx;
 839
 840                 if (freq > target_freq) {
 841                         best = idx;
 842                         continue;
 843                 }
 844
 845                 /* No freq found above target_freq */
 846                 if (best == -1)
 847                         return idx;
 848
 849                 return best;
 850         }
 851
 852         return best;
 853 }
 854
 855 static inline int find_index_l(struct cpufreq_policy *policy,
 856                                unsigned int target_freq,
 857                                unsigned int min, unsigned int max,
 858                                bool efficiencies)
 859 {
 860         target_freq = clamp_val(target_freq, min, max);
 861
 862         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 863                 return cpufreq_table_find_index_al(policy, target_freq,
 864                                                    efficiencies);
 865         else
 866                 return cpufreq_table_find_index_dl(policy, target_freq,
 867                                                    efficiencies);
 868 }
 869
 870 /* Works only on sorted freq-tables */
 871 static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
 872                                              unsigned int target_freq,
 873                                              bool efficiencies)
 874 {
 875         return find_index_l(policy, target_freq, policy->min, policy->max, efficiencies);
 876 }
 877
 878 /* Find highest freq at or below target in a table in ascending order */
 879 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
 880                                               unsigned int target_freq,
 881                                               bool efficiencies)
 882 {
 883         struct cpufreq_frequency_table *table = policy->freq_table;
 884         struct cpufreq_frequency_table *pos;
 885         unsigned int freq;
 886         int idx, best = -1;
 887
 888         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 889                 freq = pos->frequency;
 890
 891                 if (freq == target_freq)
 892                         return idx;
 893
 894                 if (freq < target_freq) {
 895                         best = idx;
 896                         continue;
 897                 }
 898
 899                 /* No freq found below target_freq */
 900                 if (best == -1)
 901                         return idx;
 902
 903                 return best;
 904         }
 905
 906         return best;
 907 }
 908
 909 /* Find highest freq at or below target in a table in descending order */
 910 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
 911                                               unsigned int target_freq,
 912                                               bool efficiencies)
 913 {
 914         struct cpufreq_frequency_table *table = policy->freq_table;
 915         struct cpufreq_frequency_table *pos;
 916         unsigned int freq;
 917         int idx, best = -1;
 918
 919         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 920                 freq = pos->frequency;
 921
 922                 if (freq <= target_freq)
 923                         return idx;
 924
 925                 best = idx;
 926         }
 927
 928         return best;
 929 }
 930
 931 static inline int find_index_h(struct cpufreq_policy *policy,
 932                                unsigned int target_freq,
 933                                unsigned int min, unsigned int max,
 934                                bool efficiencies)
 935 {
 936         target_freq = clamp_val(target_freq, min, max);
 937
 938         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
 939                 return cpufreq_table_find_index_ah(policy, target_freq,
 940                                                    efficiencies);
 941         else
 942                 return cpufreq_table_find_index_dh(policy, target_freq,
 943                                                    efficiencies);
 944 }
 945
 946 /* Works only on sorted freq-tables */
 947 static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
 948                                              unsigned int target_freq,
 949                                              bool efficiencies)
 950 {
 951         return find_index_h(policy, target_freq, policy->min, policy->max, efficiencies);
 952 }
 953
 954 /* Find closest freq to target in a table in ascending order */
 955 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
 956                                               unsigned int target_freq,
 957                                               bool efficiencies)
 958 {
 959         struct cpufreq_frequency_table *table = policy->freq_table;
 960         struct cpufreq_frequency_table *pos;
 961         unsigned int freq;
 962         int idx, best = -1;
 963
 964         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
 965                 freq = pos->frequency;
 966
 967                 if (freq == target_freq)
 968                         return idx;
 969
 970                 if (freq < target_freq) {
 971                         best = idx;
 972                         continue;
 973                 }
 974
 975                 /* No freq found below target_freq */
 976                 if (best == -1)
 977                         return idx;
 978
 979                 /* Choose the closest freq */
 980                 if (target_freq - table[best].frequency > freq - target_freq)
 981                         return idx;
 982
 983                 return best;
 984         }
 985
 986         return best;
 987 }
 988
 989 /* Find closest freq to target in a table in descending order */
 990 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
 991                                               unsigned int target_freq,
 992                                               bool efficiencies)
 993 {
 994         struct cpufreq_frequency_table *table = policy->freq_table;
 995         struct cpufreq_frequency_table *pos;
 996         unsigned int freq;
 997         int idx, best = -1;
 998
 999         cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) {
1000                 freq = pos->frequency;
1001
1002                 if (freq == target_freq)
1003                         return idx;
1004
1005                 if (freq > target_freq) {
1006                         best = idx;
1007                         continue;
1008                 }
1009
1010                 /* No freq found above target_freq */
1011                 if (best == -1)
1012                         return idx;
1013
1014                 /* Choose the closest freq */
1015                 if (table[best].frequency - target_freq > target_freq - freq)
1016                         return idx;
1017
1018                 return best;
1019         }
1020
1021         return best;
1022 }
1023
1024 static inline int find_index_c(struct cpufreq_policy *policy,
1025                                unsigned int target_freq,
1026                                unsigned int min, unsigned int max,
1027                                bool efficiencies)
1028 {
1029         target_freq = clamp_val(target_freq, min, max);
1030
1031         if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
1032                 return cpufreq_table_find_index_ac(policy, target_freq,
1033                                                    efficiencies);
1034         else
1035                 return cpufreq_table_find_index_dc(policy, target_freq,
1036                                                    efficiencies);
1037 }
1038
1039 /* Works only on sorted freq-tables */
1040 static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
1041                                              unsigned int target_freq,
1042                                              bool efficiencies)
1043 {
1044         return find_index_c(policy, target_freq, policy->min, policy->max, efficiencies);
1045 }
1046
1047 static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy,
1048                                         unsigned int min, unsigned int max,
1049                                         int idx)
1050 {
1051         unsigned int freq;
1052
1053         if (idx < 0)
1054                 return false;
1055
1056         freq = policy->freq_table[idx].frequency;
1057
1058         return freq == clamp_val(freq, min, max);
1059 }
1060
1061 static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
1062                                                  unsigned int target_freq,
1063                                                  unsigned int min,
1064                                                  unsigned int max,
1065                                                  unsigned int relation)
1066 {
1067         bool efficiencies = policy->efficiencies_available &&
1068                             (relation & CPUFREQ_RELATION_E);
1069         int idx;
1070
1071         /* cpufreq_table_index_unsorted() has no use for this flag anyway */
1072         relation &= ~CPUFREQ_RELATION_E;
1073
1074         if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
1075                 return cpufreq_table_index_unsorted(policy, target_freq, min,
1076                                                     max, relation);
1077 retry:
1078         switch (relation) {
1079         case CPUFREQ_RELATION_L:
1080                 idx = find_index_l(policy, target_freq, min, max, efficiencies);
1081                 break;
1082         case CPUFREQ_RELATION_H:
1083                 idx = find_index_h(policy, target_freq, min, max, efficiencies);
1084                 break;
1085         case CPUFREQ_RELATION_C:
1086                 idx = find_index_c(policy, target_freq, min, max, efficiencies);
1087                 break;
1088         default:
1089                 WARN_ON_ONCE(1);
1090                 return 0;
1091         }
1092
1093         /* Limit frequency index to honor min and max */
1094         if (!cpufreq_is_in_limits(policy, min, max, idx) && efficiencies) {
1095                 efficiencies = false;
1096                 goto retry;
1097         }
1098
1099         return idx;
1100 }
1101
1102 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
1103 {
1104         struct cpufreq_frequency_table *pos;
1105         int count = 0;
1106
1107         if (unlikely(!policy->freq_table))
1108                 return 0;
1109
1110         cpufreq_for_each_valid_entry(pos, policy->freq_table)
1111                 count++;
1112
1113         return count;
1114 }
1115
1116 /**
1117  * cpufreq_table_set_inefficient() - Mark a frequency as inefficient
1118  * @policy:     the &struct cpufreq_policy containing the inefficient frequency
1119  * @frequency:  the inefficient frequency
1120  *
1121  * The &struct cpufreq_policy must use a sorted frequency table
1122  *
1123  * Return:      %0 on success or a negative errno code
1124  */
1125
1126 static inline int
1127 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1128                               unsigned int frequency)
1129 {
1130         struct cpufreq_frequency_table *pos;
1131
1132         /* Not supported */
1133         if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
1134                 return -EINVAL;
1135
1136         cpufreq_for_each_valid_entry(pos, policy->freq_table) {
1137                 if (pos->frequency == frequency) {
1138                         pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
1139                         policy->efficiencies_available = true;
1140                         return 0;
1141                 }
1142         }
1143
1144         return -EINVAL;
1145 }
1146
1147 static inline int parse_perf_domain(int cpu, const char *list_name,
1148                                     const char *cell_name,
1149                                     struct of_phandle_args *args)
1150 {
1151         int ret;
1152
1153         struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu);
1154         if (!cpu_np)
1155                 return -ENODEV;
1156
1157         ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0,
1158                                          args);
1159         if (ret < 0)
1160                 return ret;
1161         return 0;
1162 }
1163
1164 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1165                                                      const char *cell_name, struct cpumask *cpumask,
1166                                                      struct of_phandle_args *pargs)
1167 {
1168         int cpu, ret;
1169         struct of_phandle_args args;
1170
1171         ret = parse_perf_domain(pcpu, list_name, cell_name, pargs);
1172         if (ret < 0)
1173                 return ret;
1174
1175         cpumask_set_cpu(pcpu, cpumask);
1176
1177         for_each_possible_cpu(cpu) {
1178                 if (cpu == pcpu)
1179                         continue;
1180
1181                 ret = parse_perf_domain(cpu, list_name, cell_name, &args);
1182                 if (ret < 0)
1183                         continue;
1184
1185                 if (of_phandle_args_equal(pargs, &args))
1186                         cpumask_set_cpu(cpu, cpumask);
1187
1188                 of_node_put(args.np);
1189         }
1190
1191         return 0;
1192 }
1193 #else
1194 static inline bool cpufreq_boost_enabled(void)
1195 {
1196         return false;
1197 }
1198
1199 static inline int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
1200 {
1201         return -EOPNOTSUPP;
1202 }
1203
1204 static inline int
1205 cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
1206                               unsigned int frequency)
1207 {
1208         return -EINVAL;
1209 }
1210
1211 static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
1212                                                      const char *cell_name, struct cpumask *cpumask,
1213                                                      struct of_phandle_args *pargs)
1214 {
1215         return -EOPNOTSUPP;
1216 }
1217 #endif
1218
1219 extern int arch_freq_get_on_cpu(int cpu);
1220
1221 #ifndef arch_set_freq_scale
1222 static __always_inline
1223 void arch_set_freq_scale(const struct cpumask *cpus,
1224                          unsigned long cur_freq,
1225                          unsigned long max_freq)
1226 {
1227 }
1228 #endif
1229
1230 /* the following are really really optional */
1231 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
1232 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
1233 int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy);
1234
1235 unsigned int cpufreq_generic_get(unsigned int cpu);
1236 void cpufreq_generic_init(struct cpufreq_policy *policy,
1237                 struct cpufreq_frequency_table *table,
1238                 unsigned int transition_latency);
1239
1240 bool cpufreq_ready_for_eas(const struct cpumask *cpu_mask);
1241
1242 static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy)
1243 {
1244         dev_pm_opp_of_register_em(get_cpu_device(policy->cpu),
1245                                   policy->related_cpus);
1246 }
1247 #endif /* _LINUX_CPUFREQ_H */