1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/include/linux/cpufreq.h
5 * Copyright (C) 2001 Russell King
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
8 #ifndef _LINUX_CPUFREQ_H
9 #define _LINUX_CPUFREQ_H
11 #include <linux/clk.h>
12 #include <linux/cpumask.h>
13 #include <linux/completion.h>
14 #include <linux/kobject.h>
15 #include <linux/notifier.h>
16 #include <linux/pm_qos.h>
17 #include <linux/spinlock.h>
18 #include <linux/sysfs.h>
20 /*********************************************************************
22 *********************************************************************/
24 * Frequency values here are CPU kHz
26 * Maximum transition latency is in nanoseconds - if it's unknown,
27 * CPUFREQ_ETERNAL shall be used.
30 #define CPUFREQ_ETERNAL (-1)
31 #define CPUFREQ_NAME_LEN 16
32 /* Print length for names. Extra 1 space for accommodating '\n' in prints */
33 #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
35 struct cpufreq_governor
;
37 enum cpufreq_table_sorting
{
38 CPUFREQ_TABLE_UNSORTED
,
39 CPUFREQ_TABLE_SORTED_ASCENDING
,
40 CPUFREQ_TABLE_SORTED_DESCENDING
43 struct cpufreq_cpuinfo
{
44 unsigned int max_freq
;
45 unsigned int min_freq
;
47 /* in 10^(-9) s = nanoseconds */
48 unsigned int transition_latency
;
51 struct cpufreq_policy
{
52 /* CPUs sharing clock, require sw coordination */
53 cpumask_var_t cpus
; /* Online CPUs only */
54 cpumask_var_t related_cpus
; /* Online + Offline CPUs */
55 cpumask_var_t real_cpus
; /* Related and present */
57 unsigned int shared_type
; /* ACPI: ANY or ALL affected CPUs
59 unsigned int cpu
; /* cpu managing this policy, must be online */
62 struct cpufreq_cpuinfo cpuinfo
;/* see above */
64 unsigned int min
; /* in kHz */
65 unsigned int max
; /* in kHz */
66 unsigned int cur
; /* in kHz, only needed if cpufreq
67 * governors are used */
68 unsigned int suspend_freq
; /* freq to set during suspend */
70 unsigned int policy
; /* see above */
71 unsigned int last_policy
; /* policy before unplug */
72 struct cpufreq_governor
*governor
; /* see below */
74 char last_governor
[CPUFREQ_NAME_LEN
]; /* last governor used */
76 struct work_struct update
; /* if update_policy() needs to be
77 * called, but you're in IRQ context */
79 struct freq_constraints constraints
;
80 struct freq_qos_request
*min_freq_req
;
81 struct freq_qos_request
*max_freq_req
;
83 struct cpufreq_frequency_table
*freq_table
;
84 enum cpufreq_table_sorting freq_table_sorted
;
86 struct list_head policy_list
;
88 struct completion kobj_unregister
;
91 * The rules for this semaphore:
92 * - Any routine that wants to read from the policy structure will
93 * do a down_read on this semaphore.
94 * - Any routine that will write to the policy structure and/or may take away
95 * the policy altogether (eg. CPU hotplug), will hold this lock in write
96 * mode before doing so.
98 struct rw_semaphore rwsem
;
102 * - fast_switch_possible should be set by the driver if it can
103 * guarantee that frequency can be changed on any CPU sharing the
104 * policy and that the change will affect all of the policy CPUs then.
105 * - fast_switch_enabled is to be set by governors that support fast
106 * frequency switching with the help of cpufreq_enable_fast_switch().
108 bool fast_switch_possible
;
109 bool fast_switch_enabled
;
112 * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current
118 * Preferred average time interval between consecutive invocations of
119 * the driver to set the frequency for this policy. To be set by the
120 * scaling driver (0, which is the default, means no preference).
122 unsigned int transition_delay_us
;
125 * Remote DVFS flag (Not added to the driver structure as we don't want
126 * to access another structure from scheduler hotpath).
128 * Should be set if CPUs can do DVFS on behalf of other CPUs from
129 * different cpufreq policies.
131 bool dvfs_possible_from_any_cpu
;
133 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
134 unsigned int cached_target_freq
;
135 unsigned int cached_resolved_idx
;
137 /* Synchronization for frequency transitions */
138 bool transition_ongoing
; /* Tracks transition status */
139 spinlock_t transition_lock
;
140 wait_queue_head_t transition_wait
;
141 struct task_struct
*transition_task
; /* Task which is doing the transition */
144 struct cpufreq_stats
*stats
;
146 /* For cpufreq driver's internal use */
149 /* Pointer to the cooling device if used for thermal mitigation */
150 struct thermal_cooling_device
*cdev
;
152 struct notifier_block nb_min
;
153 struct notifier_block nb_max
;
157 * Used for passing new cpufreq policy data to the cpufreq driver's ->verify()
158 * callback for sanitization. That callback is only expected to modify the min
159 * and max values, if necessary, and specifically it must not update the
162 struct cpufreq_policy_data
{
163 struct cpufreq_cpuinfo cpuinfo
;
164 struct cpufreq_frequency_table
*freq_table
;
166 unsigned int min
; /* in kHz */
167 unsigned int max
; /* in kHz */
170 struct cpufreq_freqs
{
171 struct cpufreq_policy
*policy
;
174 u8 flags
; /* flags of cpufreq_driver, see below. */
178 #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
179 #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
180 #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
181 #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
183 #ifdef CONFIG_CPU_FREQ
184 struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
);
185 struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
);
186 void cpufreq_cpu_put(struct cpufreq_policy
*policy
);
188 static inline struct cpufreq_policy
*cpufreq_cpu_get_raw(unsigned int cpu
)
192 static inline struct cpufreq_policy
*cpufreq_cpu_get(unsigned int cpu
)
196 static inline void cpufreq_cpu_put(struct cpufreq_policy
*policy
) { }
199 static inline bool policy_is_inactive(struct cpufreq_policy
*policy
)
201 return cpumask_empty(policy
->cpus
);
204 static inline bool policy_is_shared(struct cpufreq_policy
*policy
)
206 return cpumask_weight(policy
->cpus
) > 1;
209 #ifdef CONFIG_CPU_FREQ
210 unsigned int cpufreq_get(unsigned int cpu
);
211 unsigned int cpufreq_quick_get(unsigned int cpu
);
212 unsigned int cpufreq_quick_get_max(unsigned int cpu
);
213 unsigned int cpufreq_get_hw_max_freq(unsigned int cpu
);
214 void disable_cpufreq(void);
216 u64
get_cpu_idle_time(unsigned int cpu
, u64
*wall
, int io_busy
);
218 struct cpufreq_policy
*cpufreq_cpu_acquire(unsigned int cpu
);
219 void cpufreq_cpu_release(struct cpufreq_policy
*policy
);
220 int cpufreq_get_policy(struct cpufreq_policy
*policy
, unsigned int cpu
);
221 void refresh_frequency_limits(struct cpufreq_policy
*policy
);
222 void cpufreq_update_policy(unsigned int cpu
);
223 void cpufreq_update_limits(unsigned int cpu
);
224 bool have_governor_per_policy(void);
225 bool cpufreq_supports_freq_invariance(void);
226 struct kobject
*get_governor_parent_kobj(struct cpufreq_policy
*policy
);
227 void cpufreq_enable_fast_switch(struct cpufreq_policy
*policy
);
228 void cpufreq_disable_fast_switch(struct cpufreq_policy
*policy
);
230 static inline unsigned int cpufreq_get(unsigned int cpu
)
234 static inline unsigned int cpufreq_quick_get(unsigned int cpu
)
238 static inline unsigned int cpufreq_quick_get_max(unsigned int cpu
)
242 static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu
)
246 static inline bool cpufreq_supports_freq_invariance(void)
250 static inline void disable_cpufreq(void) { }
253 #ifdef CONFIG_CPU_FREQ_STAT
254 void cpufreq_stats_create_table(struct cpufreq_policy
*policy
);
255 void cpufreq_stats_free_table(struct cpufreq_policy
*policy
);
256 void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
257 unsigned int new_freq
);
259 static inline void cpufreq_stats_create_table(struct cpufreq_policy
*policy
) { }
260 static inline void cpufreq_stats_free_table(struct cpufreq_policy
*policy
) { }
261 static inline void cpufreq_stats_record_transition(struct cpufreq_policy
*policy
,
262 unsigned int new_freq
) { }
263 #endif /* CONFIG_CPU_FREQ_STAT */
265 /*********************************************************************
266 * CPUFREQ DRIVER INTERFACE *
267 *********************************************************************/
269 #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
270 #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
271 #define CPUFREQ_RELATION_C 2 /* closest frequency to target */
274 struct attribute attr
;
275 ssize_t (*show
)(struct cpufreq_policy
*, char *);
276 ssize_t (*store
)(struct cpufreq_policy
*, const char *, size_t count
);
279 #define cpufreq_freq_attr_ro(_name) \
280 static struct freq_attr _name = \
281 __ATTR(_name, 0444, show_##_name, NULL)
283 #define cpufreq_freq_attr_ro_perm(_name, _perm) \
284 static struct freq_attr _name = \
285 __ATTR(_name, _perm, show_##_name, NULL)
287 #define cpufreq_freq_attr_rw(_name) \
288 static struct freq_attr _name = \
289 __ATTR(_name, 0644, show_##_name, store_##_name)
291 #define cpufreq_freq_attr_wo(_name) \
292 static struct freq_attr _name = \
293 __ATTR(_name, 0200, NULL, store_##_name)
295 #define define_one_global_ro(_name) \
296 static struct kobj_attribute _name = \
297 __ATTR(_name, 0444, show_##_name, NULL)
299 #define define_one_global_rw(_name) \
300 static struct kobj_attribute _name = \
301 __ATTR(_name, 0644, show_##_name, store_##_name)
304 struct cpufreq_driver
{
305 char name
[CPUFREQ_NAME_LEN
];
309 /* needed by all drivers */
310 int (*init
)(struct cpufreq_policy
*policy
);
311 int (*verify
)(struct cpufreq_policy_data
*policy
);
313 /* define one out of two */
314 int (*setpolicy
)(struct cpufreq_policy
*policy
);
316 int (*target
)(struct cpufreq_policy
*policy
,
317 unsigned int target_freq
,
318 unsigned int relation
); /* Deprecated */
319 int (*target_index
)(struct cpufreq_policy
*policy
,
321 unsigned int (*fast_switch
)(struct cpufreq_policy
*policy
,
322 unsigned int target_freq
);
324 * ->fast_switch() replacement for drivers that use an internal
325 * representation of performance levels and can pass hints other than
326 * the target performance level to the hardware.
328 void (*adjust_perf
)(unsigned int cpu
,
329 unsigned long min_perf
,
330 unsigned long target_perf
,
331 unsigned long capacity
);
334 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
337 * get_intermediate should return a stable intermediate frequency
338 * platform wants to switch to and target_intermediate() should set CPU
339 * to that frequency, before jumping to the frequency corresponding
340 * to 'index'. Core will take care of sending notifications and driver
341 * doesn't have to handle them in target_intermediate() or
344 * Drivers can return '0' from get_intermediate() in case they don't
345 * wish to switch to intermediate frequency for some target frequency.
346 * In that case core will directly call ->target_index().
348 unsigned int (*get_intermediate
)(struct cpufreq_policy
*policy
,
350 int (*target_intermediate
)(struct cpufreq_policy
*policy
,
353 /* should be defined, if possible */
354 unsigned int (*get
)(unsigned int cpu
);
356 /* Called to update policy limits on firmware notifications. */
357 void (*update_limits
)(unsigned int cpu
);
360 int (*bios_limit
)(int cpu
, unsigned int *limit
);
362 int (*online
)(struct cpufreq_policy
*policy
);
363 int (*offline
)(struct cpufreq_policy
*policy
);
364 int (*exit
)(struct cpufreq_policy
*policy
);
365 int (*suspend
)(struct cpufreq_policy
*policy
);
366 int (*resume
)(struct cpufreq_policy
*policy
);
368 /* Will be called after the driver is fully initialized */
369 void (*ready
)(struct cpufreq_policy
*policy
);
371 struct freq_attr
**attr
;
373 /* platform specific boost support code */
375 int (*set_boost
)(struct cpufreq_policy
*policy
, int state
);
381 * Set by drivers that need to update internale upper and lower boundaries along
382 * with the target frequency and so the core and governors should also invoke
383 * the diver if the target frequency does not change, but the policy min or max
386 #define CPUFREQ_NEED_UPDATE_LIMITS BIT(0)
388 /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */
389 #define CPUFREQ_CONST_LOOPS BIT(1)
392 * Set by drivers that want the core to automatically register the cpufreq
393 * driver as a thermal cooling device.
395 #define CPUFREQ_IS_COOLING_DEV BIT(2)
398 * This should be set by platforms having multiple clock-domains, i.e.
399 * supporting multiple policies. With this sysfs directories of governor would
400 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
401 * governor with different tunables for different clusters.
403 #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY BIT(3)
406 * Driver will do POSTCHANGE notifications from outside of their ->target()
407 * routine and so must set cpufreq_driver->flags with this flag, so that core
408 * can handle them specially.
410 #define CPUFREQ_ASYNC_NOTIFICATION BIT(4)
413 * Set by drivers which want cpufreq core to check if CPU is running at a
414 * frequency present in freq-table exposed by the driver. For these drivers if
415 * CPU is found running at an out of table freq, we will try to set it to a freq
416 * from the table. And if that fails, we will stop further boot process by
417 * issuing a BUG_ON().
419 #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5)
422 * Set by drivers to disallow use of governors with "dynamic_switching" flag
425 #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING BIT(6)
427 int cpufreq_register_driver(struct cpufreq_driver
*driver_data
);
428 int cpufreq_unregister_driver(struct cpufreq_driver
*driver_data
);
430 bool cpufreq_driver_test_flags(u16 flags
);
431 const char *cpufreq_get_current_driver(void);
432 void *cpufreq_get_driver_data(void);
434 static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver
*drv
)
436 return IS_ENABLED(CONFIG_CPU_THERMAL
) &&
437 (drv
->flags
& CPUFREQ_IS_COOLING_DEV
);
440 static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data
*policy
,
444 if (policy
->min
< min
)
446 if (policy
->max
< min
)
448 if (policy
->min
> max
)
450 if (policy
->max
> max
)
452 if (policy
->min
> policy
->max
)
453 policy
->min
= policy
->max
;
458 cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data
*policy
)
460 cpufreq_verify_within_limits(policy
, policy
->cpuinfo
.min_freq
,
461 policy
->cpuinfo
.max_freq
);
464 #ifdef CONFIG_CPU_FREQ
465 void cpufreq_suspend(void);
466 void cpufreq_resume(void);
467 int cpufreq_generic_suspend(struct cpufreq_policy
*policy
);
469 static inline void cpufreq_suspend(void) {}
470 static inline void cpufreq_resume(void) {}
473 /*********************************************************************
474 * CPUFREQ NOTIFIER INTERFACE *
475 *********************************************************************/
477 #define CPUFREQ_TRANSITION_NOTIFIER (0)
478 #define CPUFREQ_POLICY_NOTIFIER (1)
480 /* Transition notifiers */
481 #define CPUFREQ_PRECHANGE (0)
482 #define CPUFREQ_POSTCHANGE (1)
484 /* Policy Notifiers */
485 #define CPUFREQ_CREATE_POLICY (0)
486 #define CPUFREQ_REMOVE_POLICY (1)
488 #ifdef CONFIG_CPU_FREQ
489 int cpufreq_register_notifier(struct notifier_block
*nb
, unsigned int list
);
490 int cpufreq_unregister_notifier(struct notifier_block
*nb
, unsigned int list
);
492 void cpufreq_freq_transition_begin(struct cpufreq_policy
*policy
,
493 struct cpufreq_freqs
*freqs
);
494 void cpufreq_freq_transition_end(struct cpufreq_policy
*policy
,
495 struct cpufreq_freqs
*freqs
, int transition_failed
);
497 #else /* CONFIG_CPU_FREQ */
498 static inline int cpufreq_register_notifier(struct notifier_block
*nb
,
503 static inline int cpufreq_unregister_notifier(struct notifier_block
*nb
,
508 #endif /* !CONFIG_CPU_FREQ */
511 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
518 * new = old * mult / div
520 static inline unsigned long cpufreq_scale(unsigned long old
, u_int div
,
523 #if BITS_PER_LONG == 32
524 u64 result
= ((u64
) old
) * ((u64
) mult
);
526 return (unsigned long) result
;
528 #elif BITS_PER_LONG == 64
529 unsigned long result
= old
* ((u64
) mult
);
535 /*********************************************************************
536 * CPUFREQ GOVERNORS *
537 *********************************************************************/
539 #define CPUFREQ_POLICY_UNKNOWN (0)
541 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
542 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
543 * two generic policies are available:
545 #define CPUFREQ_POLICY_POWERSAVE (1)
546 #define CPUFREQ_POLICY_PERFORMANCE (2)
549 * The polling frequency depends on the capability of the processor. Default
550 * polling frequency is 1000 times the transition latency of the processor. The
551 * ondemand governor will work on any processor with transition latency <= 10ms,
552 * using appropriate sampling rate.
554 #define LATENCY_MULTIPLIER (1000)
556 struct cpufreq_governor
{
557 char name
[CPUFREQ_NAME_LEN
];
558 int (*init
)(struct cpufreq_policy
*policy
);
559 void (*exit
)(struct cpufreq_policy
*policy
);
560 int (*start
)(struct cpufreq_policy
*policy
);
561 void (*stop
)(struct cpufreq_policy
*policy
);
562 void (*limits
)(struct cpufreq_policy
*policy
);
563 ssize_t (*show_setspeed
) (struct cpufreq_policy
*policy
,
565 int (*store_setspeed
) (struct cpufreq_policy
*policy
,
567 struct list_head governor_list
;
568 struct module
*owner
;
574 /* For governors which change frequency dynamically by themselves */
575 #define CPUFREQ_GOV_DYNAMIC_SWITCHING BIT(0)
577 /* For governors wanting the target frequency to be set exactly */
578 #define CPUFREQ_GOV_STRICT_TARGET BIT(1)
581 /* Pass a target to the cpufreq driver */
582 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy
*policy
,
583 unsigned int target_freq
);
584 void cpufreq_driver_adjust_perf(unsigned int cpu
,
585 unsigned long min_perf
,
586 unsigned long target_perf
,
587 unsigned long capacity
);
588 bool cpufreq_driver_has_adjust_perf(void);
589 int cpufreq_driver_target(struct cpufreq_policy
*policy
,
590 unsigned int target_freq
,
591 unsigned int relation
);
592 int __cpufreq_driver_target(struct cpufreq_policy
*policy
,
593 unsigned int target_freq
,
594 unsigned int relation
);
595 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy
*policy
,
596 unsigned int target_freq
);
597 unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy
*policy
);
598 int cpufreq_register_governor(struct cpufreq_governor
*governor
);
599 void cpufreq_unregister_governor(struct cpufreq_governor
*governor
);
600 int cpufreq_start_governor(struct cpufreq_policy
*policy
);
601 void cpufreq_stop_governor(struct cpufreq_policy
*policy
);
603 #define cpufreq_governor_init(__governor) \
604 static int __init __governor##_init(void) \
606 return cpufreq_register_governor(&__governor); \
608 core_initcall(__governor##_init)
610 #define cpufreq_governor_exit(__governor) \
611 static void __exit __governor##_exit(void) \
613 return cpufreq_unregister_governor(&__governor); \
615 module_exit(__governor##_exit)
617 struct cpufreq_governor
*cpufreq_default_governor(void);
618 struct cpufreq_governor
*cpufreq_fallback_governor(void);
620 static inline void cpufreq_policy_apply_limits(struct cpufreq_policy
*policy
)
622 if (policy
->max
< policy
->cur
)
623 __cpufreq_driver_target(policy
, policy
->max
, CPUFREQ_RELATION_H
);
624 else if (policy
->min
> policy
->cur
)
625 __cpufreq_driver_target(policy
, policy
->min
, CPUFREQ_RELATION_L
);
628 /* Governor attribute set */
629 struct gov_attr_set
{
631 struct list_head policy_list
;
632 struct mutex update_lock
;
636 /* sysfs ops for cpufreq governors */
637 extern const struct sysfs_ops governor_sysfs_ops
;
639 void gov_attr_set_init(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
640 void gov_attr_set_get(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
641 unsigned int gov_attr_set_put(struct gov_attr_set
*attr_set
, struct list_head
*list_node
);
643 /* Governor sysfs attribute */
644 struct governor_attr
{
645 struct attribute attr
;
646 ssize_t (*show
)(struct gov_attr_set
*attr_set
, char *buf
);
647 ssize_t (*store
)(struct gov_attr_set
*attr_set
, const char *buf
,
651 /*********************************************************************
652 * FREQUENCY TABLE HELPERS *
653 *********************************************************************/
655 /* Special Values of .frequency field */
656 #define CPUFREQ_ENTRY_INVALID ~0u
657 #define CPUFREQ_TABLE_END ~1u
658 /* Special Values of .flags field */
659 #define CPUFREQ_BOOST_FREQ (1 << 0)
661 struct cpufreq_frequency_table
{
663 unsigned int driver_data
; /* driver specific data, not used by core */
664 unsigned int frequency
; /* kHz - doesn't need to be in ascending
668 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
669 int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
670 struct cpufreq_frequency_table
**table
);
671 void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
672 struct cpufreq_frequency_table
**table
);
674 static inline int dev_pm_opp_init_cpufreq_table(struct device
*dev
,
675 struct cpufreq_frequency_table
681 static inline void dev_pm_opp_free_cpufreq_table(struct device
*dev
,
682 struct cpufreq_frequency_table
689 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
690 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
691 * @table: the cpufreq_frequency_table * to iterate over.
694 #define cpufreq_for_each_entry(pos, table) \
695 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
698 * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
700 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
701 * @table: the cpufreq_frequency_table * to iterate over.
702 * @idx: the table entry currently being processed
705 #define cpufreq_for_each_entry_idx(pos, table, idx) \
706 for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
710 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
711 * excluding CPUFREQ_ENTRY_INVALID frequencies.
712 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
713 * @table: the cpufreq_frequency_table * to iterate over.
716 #define cpufreq_for_each_valid_entry(pos, table) \
717 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
718 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
723 * cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq
724 * frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
725 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
726 * @table: the cpufreq_frequency_table * to iterate over.
727 * @idx: the table entry currently being processed
730 #define cpufreq_for_each_valid_entry_idx(pos, table, idx) \
731 cpufreq_for_each_entry_idx(pos, table, idx) \
732 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
737 int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy
*policy
,
738 struct cpufreq_frequency_table
*table
);
740 int cpufreq_frequency_table_verify(struct cpufreq_policy_data
*policy
,
741 struct cpufreq_frequency_table
*table
);
742 int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data
*policy
);
744 int cpufreq_table_index_unsorted(struct cpufreq_policy
*policy
,
745 unsigned int target_freq
,
746 unsigned int relation
);
747 int cpufreq_frequency_table_get_index(struct cpufreq_policy
*policy
,
750 ssize_t
cpufreq_show_cpus(const struct cpumask
*mask
, char *buf
);
752 #ifdef CONFIG_CPU_FREQ
753 int cpufreq_boost_trigger_state(int state
);
754 int cpufreq_boost_enabled(void);
755 int cpufreq_enable_boost_support(void);
756 bool policy_has_boost_freq(struct cpufreq_policy
*policy
);
758 /* Find lowest freq at or above target in a table in ascending order */
759 static inline int cpufreq_table_find_index_al(struct cpufreq_policy
*policy
,
760 unsigned int target_freq
)
762 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
763 struct cpufreq_frequency_table
*pos
;
767 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
768 freq
= pos
->frequency
;
770 if (freq
>= target_freq
)
779 /* Find lowest freq at or above target in a table in descending order */
780 static inline int cpufreq_table_find_index_dl(struct cpufreq_policy
*policy
,
781 unsigned int target_freq
)
783 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
784 struct cpufreq_frequency_table
*pos
;
788 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
789 freq
= pos
->frequency
;
791 if (freq
== target_freq
)
794 if (freq
> target_freq
) {
799 /* No freq found above target_freq */
809 /* Works only on sorted freq-tables */
810 static inline int cpufreq_table_find_index_l(struct cpufreq_policy
*policy
,
811 unsigned int target_freq
)
813 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
815 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
816 return cpufreq_table_find_index_al(policy
, target_freq
);
818 return cpufreq_table_find_index_dl(policy
, target_freq
);
821 /* Find highest freq at or below target in a table in ascending order */
822 static inline int cpufreq_table_find_index_ah(struct cpufreq_policy
*policy
,
823 unsigned int target_freq
)
825 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
826 struct cpufreq_frequency_table
*pos
;
830 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
831 freq
= pos
->frequency
;
833 if (freq
== target_freq
)
836 if (freq
< target_freq
) {
841 /* No freq found below target_freq */
851 /* Find highest freq at or below target in a table in descending order */
852 static inline int cpufreq_table_find_index_dh(struct cpufreq_policy
*policy
,
853 unsigned int target_freq
)
855 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
856 struct cpufreq_frequency_table
*pos
;
860 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
861 freq
= pos
->frequency
;
863 if (freq
<= target_freq
)
872 /* Works only on sorted freq-tables */
873 static inline int cpufreq_table_find_index_h(struct cpufreq_policy
*policy
,
874 unsigned int target_freq
)
876 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
878 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
879 return cpufreq_table_find_index_ah(policy
, target_freq
);
881 return cpufreq_table_find_index_dh(policy
, target_freq
);
884 /* Find closest freq to target in a table in ascending order */
885 static inline int cpufreq_table_find_index_ac(struct cpufreq_policy
*policy
,
886 unsigned int target_freq
)
888 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
889 struct cpufreq_frequency_table
*pos
;
893 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
894 freq
= pos
->frequency
;
896 if (freq
== target_freq
)
899 if (freq
< target_freq
) {
904 /* No freq found below target_freq */
908 /* Choose the closest freq */
909 if (target_freq
- table
[best
].frequency
> freq
- target_freq
)
918 /* Find closest freq to target in a table in descending order */
919 static inline int cpufreq_table_find_index_dc(struct cpufreq_policy
*policy
,
920 unsigned int target_freq
)
922 struct cpufreq_frequency_table
*table
= policy
->freq_table
;
923 struct cpufreq_frequency_table
*pos
;
927 cpufreq_for_each_valid_entry_idx(pos
, table
, idx
) {
928 freq
= pos
->frequency
;
930 if (freq
== target_freq
)
933 if (freq
> target_freq
) {
938 /* No freq found above target_freq */
942 /* Choose the closest freq */
943 if (table
[best
].frequency
- target_freq
> target_freq
- freq
)
952 /* Works only on sorted freq-tables */
953 static inline int cpufreq_table_find_index_c(struct cpufreq_policy
*policy
,
954 unsigned int target_freq
)
956 target_freq
= clamp_val(target_freq
, policy
->min
, policy
->max
);
958 if (policy
->freq_table_sorted
== CPUFREQ_TABLE_SORTED_ASCENDING
)
959 return cpufreq_table_find_index_ac(policy
, target_freq
);
961 return cpufreq_table_find_index_dc(policy
, target_freq
);
964 static inline int cpufreq_frequency_table_target(struct cpufreq_policy
*policy
,
965 unsigned int target_freq
,
966 unsigned int relation
)
968 if (unlikely(policy
->freq_table_sorted
== CPUFREQ_TABLE_UNSORTED
))
969 return cpufreq_table_index_unsorted(policy
, target_freq
,
973 case CPUFREQ_RELATION_L
:
974 return cpufreq_table_find_index_l(policy
, target_freq
);
975 case CPUFREQ_RELATION_H
:
976 return cpufreq_table_find_index_h(policy
, target_freq
);
977 case CPUFREQ_RELATION_C
:
978 return cpufreq_table_find_index_c(policy
, target_freq
);
985 static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy
*policy
)
987 struct cpufreq_frequency_table
*pos
;
990 if (unlikely(!policy
->freq_table
))
993 cpufreq_for_each_valid_entry(pos
, policy
->freq_table
)
999 static inline int cpufreq_boost_trigger_state(int state
)
1003 static inline int cpufreq_boost_enabled(void)
1008 static inline int cpufreq_enable_boost_support(void)
1013 static inline bool policy_has_boost_freq(struct cpufreq_policy
*policy
)
1019 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1020 void sched_cpufreq_governor_change(struct cpufreq_policy
*policy
,
1021 struct cpufreq_governor
*old_gov
);
1023 static inline void sched_cpufreq_governor_change(struct cpufreq_policy
*policy
,
1024 struct cpufreq_governor
*old_gov
) { }
1027 extern void arch_freq_prepare_all(void);
1028 extern unsigned int arch_freq_get_on_cpu(int cpu
);
1030 #ifndef arch_set_freq_scale
1031 static __always_inline
1032 void arch_set_freq_scale(const struct cpumask
*cpus
,
1033 unsigned long cur_freq
,
1034 unsigned long max_freq
)
1039 /* the following are really really optional */
1040 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs
;
1041 extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs
;
1042 extern struct freq_attr
*cpufreq_generic_attr
[];
1043 int cpufreq_table_validate_and_sort(struct cpufreq_policy
*policy
);
1045 unsigned int cpufreq_generic_get(unsigned int cpu
);
1046 void cpufreq_generic_init(struct cpufreq_policy
*policy
,
1047 struct cpufreq_frequency_table
*table
,
1048 unsigned int transition_latency
);
1049 #endif /* _LINUX_CPUFREQ_H */