summaryrefslogtreecommitdiffstats
path: root/include/linux/cpufreq.h
blob: 7e05c5e4e45cd49a82c8669089f307f9ac7e01b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
/*
 * linux/include/linux/cpufreq.h
 *
 * Copyright (C) 2001 Russell King
 *           (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _LINUX_CPUFREQ_H
#define _LINUX_CPUFREQ_H

#include <linux/clk.h>
#include <linux/cpumask.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>

/*********************************************************************
 *                        CPUFREQ INTERFACE                          *
 *********************************************************************/
/*
 * Frequency values here are CPU kHz
 *
 * Maximum transition latency is in nanoseconds - if it's unknown,
 * CPUFREQ_ETERNAL shall be used.
 */

#define CPUFREQ_ETERNAL			(-1)
#define CPUFREQ_NAME_LEN		16
/* Print length for names. Extra 1 space for accomodating '\n' in prints */
#define CPUFREQ_NAME_PLEN		(CPUFREQ_NAME_LEN + 1)

struct cpufreq_governor;

enum cpufreq_table_sorting {
	CPUFREQ_TABLE_UNSORTED,
	CPUFREQ_TABLE_SORTED_ASCENDING,
	CPUFREQ_TABLE_SORTED_DESCENDING
};

struct cpufreq_freqs {
	unsigned int cpu;	/* cpu nr */
	unsigned int old;
	unsigned int new;
	u8 flags;		/* flags of cpufreq_driver, see below. */
};

struct cpufreq_cpuinfo {
	unsigned int		max_freq;
	unsigned int		min_freq;

	/* in 10^(-9) s = nanoseconds */
	unsigned int		transition_latency;
};

struct cpufreq_user_policy {
	unsigned int		min;    /* in kHz */
	unsigned int		max;    /* in kHz */
};

struct cpufreq_policy {
	/* CPUs sharing clock, require sw coordination */
	cpumask_var_t		cpus;	/* Online CPUs only */
	cpumask_var_t		related_cpus; /* Online + Offline CPUs */
	cpumask_var_t		real_cpus; /* Related and present */

	unsigned int		shared_type; /* ACPI: ANY or ALL affected CPUs
						should set cpufreq */
	unsigned int		cpu;    /* cpu managing this policy, must be online */

	struct clk		*clk;
	struct cpufreq_cpuinfo	cpuinfo;/* see above */

	unsigned int		min;    /* in kHz */
	unsigned int		max;    /* in kHz */
	unsigned int		cur;    /* in kHz, only needed if cpufreq
					 * governors are used */
	unsigned int		restore_freq; /* = policy->cur before transition */
	unsigned int		suspend_freq; /* freq to set during suspend */

	unsigned int		policy; /* see above */
	unsigned int		last_policy; /* policy before unplug */
	struct cpufreq_governor	*governor; /* see below */
	void			*governor_data;
	char			last_governor[CPUFREQ_NAME_LEN]; /* last governor used */

	struct work_struct	update; /* if update_policy() needs to be
					 * called, but you're in IRQ context */

	struct cpufreq_user_policy user_policy;
	struct cpufreq_frequency_table	*freq_table;
	enum cpufreq_table_sorting freq_table_sorted;

	struct list_head        policy_list;
	struct kobject		kobj;
	struct completion	kobj_unregister;

	/*
	 * The rules for this semaphore:
	 * - Any routine that wants to read from the policy structure will
	 *   do a down_read on this semaphore.
	 * - Any routine that will write to the policy structure and/or may take away
	 *   the policy altogether (eg. CPU hotplug), will hold this lock in write
	 *   mode before doing so.
	 */
	struct rw_semaphore	rwsem;

	/*
	 * Fast switch flags:
	 * - fast_switch_possible should be set by the driver if it can
	 *   guarantee that frequency can be changed on any CPU sharing the
	 *   policy and that the change will affect all of the policy CPUs then.
	 * - fast_switch_enabled is to be set by governors that support fast
	 *   freqnency switching with the help of cpufreq_enable_fast_switch().
	 */
	bool			fast_switch_possible;
	bool			fast_switch_enabled;

	 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
	unsigned int cached_target_freq;
	int cached_resolved_idx;

	/* Synchronization for frequency transitions */
	bool			transition_ongoing; /* Tracks transition status */
	spinlock_t		transition_lock;
	wait_queue_head_t	transition_wait;
	struct task_struct	*transition_task; /* Task which is doing the transition */

	/* cpufreq-stats */
	struct cpufreq_stats	*stats;

	/* For cpufreq driver's internal use */
	void			*driver_data;
};

/* Only for ACPI */
#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
#define CPUFREQ_SHARED_TYPE_HW	 (1) /* HW does needed coordination */
#define CPUFREQ_SHARED_TYPE_ALL	 (2) /* All dependent CPUs should set freq */
#define CPUFREQ_SHARED_TYPE_ANY	 (3) /* Freq can be set from any dependent CPU*/

#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
void cpufreq_cpu_put(struct cpufreq_policy *policy);
#else
static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
{
	return NULL;
}
static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
{
	return NULL;
}
static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
#endif

static inline bool policy_is_shared(struct cpufreq_policy *policy)
{
	return cpumask_weight(policy->cpus) > 1;
}

/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
extern struct kobject *cpufreq_global_kobject;

#ifdef CONFIG_CPU_FREQ
unsigned int cpufreq_get(unsigned int cpu);
unsigned int cpufreq_quick_get(unsigned int cpu);
unsigned int cpufreq_quick_get_max(unsigned int cpu);
void disable_cpufreq(void);

u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
void cpufreq_update_policy(unsigned int cpu);
bool have_governor_per_policy(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
#else
static inline unsigned int cpufreq_get(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
	return 0;
}
static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
{
	return 0;
}
static inline void disable_cpufreq(void) { }
#endif

#ifdef CONFIG_CPU_FREQ_STAT
void cpufreq_stats_create_table(struct cpufreq_policy *policy);
void cpufreq_stats_free_table(struct cpufreq_policy *policy);
void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
				     unsigned int new_freq);
#else
static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
						   unsigned int new_freq) { }
#endif /* CONFIG_CPU_FREQ_STAT */

/*********************************************************************
 *                      CPUFREQ DRIVER INTERFACE                     *
 *********************************************************************/

#define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
#define CPUFREQ_RELATION_C 2  /* closest frequency to target */

struct freq_attr {
	struct attribute attr;
	ssize_t (*show)(struct cpufreq_policy *, char *);
	ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
};

#define cpufreq_freq_attr_ro(_name)		\
static struct freq_attr _name =			\
__ATTR(_name, 0444, show_##_name, NULL)

#define cpufreq_freq_attr_ro_perm(_name, _perm)	\
static struct freq_attr _name =			\
__ATTR(_name, _perm, show_##_name, NULL)

#define cpufreq_freq_attr_rw(_name)		\
static struct freq_attr _name =			\
__ATTR(_name, 0644, show_##_name, store_##_name)

#define cpufreq_freq_attr_wo(_name)		\
static struct freq_attr _name =			\
__ATTR(_name, 0200, NULL, store_##_name)

struct global_attr {
	struct attribute attr;
	ssize_t (*show)(struct kobject *kobj,
			struct attribute *attr, char *buf);
	ssize_t (*store)(struct kobject *a, struct attribute *b,
			 const char *c, size_t count);
};

#define define_one_global_ro(_name)		\
static struct global_attr _name =		\
__ATTR(_name, 0444, show_##_name, NULL)

#define define_one_global_rw(_name)		\
static struct global_attr _name =		\
__ATTR(_name, 0644, show_##_name, store_##_name)


struct cpufreq_driver {
	char		name[CPUFREQ_NAME_LEN];
	u8		flags;
	void		*driver_data;

	/* needed by all drivers */
	int		(*init)(struct cpufreq_policy *policy);
	int		(*verify)(struct cpufreq_policy *policy);

	/* define one out of two */
	int		(*setpolicy)(struct cpufreq_policy *policy);

	/*
	 * On failure, should always restore frequency to policy->restore_freq
	 * (i.e. old freq).
	 */
	int		(*target)(struct cpufreq_policy *policy,
				  unsigned int target_freq,
				  unsigned int relation);	/* Deprecated */
	int		(*target_index)(struct cpufreq_policy *policy,
					unsigned int index);
	unsigned int	(*fast_switch)(struct cpufreq_policy *policy,
				       unsigned int target_freq);

	/*
	 * Caches and returns the lowest driver-supported frequency greater than
	 * or equal to the target frequency, subject to any driver limitations.
	 * Does not set the frequency. Only to be implemented for drivers with
	 * target().
	 */
	unsigned int	(*resolve_freq)(struct cpufreq_policy *policy,
					unsigned int target_freq);

	/*
	 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
	 * unset.
	 *
	 * get_intermediate should return a stable intermediate frequency
	 * platform wants to switch to and target_intermediate() should set CPU
	 * to to that frequency, before jumping to the frequency corresponding
	 * to 'index'. Core will take care of sending notifications and driver
	 * doesn't have to handle them in target_intermediate() or
	 * target_index().
	 *
	 * Drivers can return '0' from get_intermediate() in case they don't
	 * wish to switch to intermediate frequency for some target frequency.
	 * In that case core will directly call ->target_index().
	 */
	unsigned int	(*get_intermediate)(struct cpufreq_policy *policy,
					    unsigned int index);
	int		(*target_intermediate)(struct cpufreq_policy *policy,
					       unsigned int index);

	/* should be defined, if possible */
	unsigned int	(*get)(unsigned int cpu);

	/* optional */
	int		(*bios_limit)(int cpu, unsigned int *limit);

	int		(*exit)(struct cpufreq_policy *policy);
	void		(*stop_cpu)(struct cpufreq_policy *policy);
	int		(*suspend)(struct cpufreq_policy *policy);
	int		(*resume)(struct cpufreq_policy *policy);

	/* Will be called after the driver is fully initialized */
	void		(*ready)(struct cpufreq_policy *policy);

	struct freq_attr **attr;

	/* platform specific boost support code */
	bool		boost_enabled;
	int		(*set_boost)(int state);
};

/* flags */
#define CPUFREQ_STICKY		(1 << 0)	/* driver isn't removed even if
						   all ->init() calls failed */
#define CPUFREQ_CONST_LOOPS	(1 << 1)	/* loops_per_jiffy or other
						   kernel "constants" aren't
						   affected by frequency
						   transitions */
#define CPUFREQ_PM_NO_WARN	(1 << 2)	/* don't warn on suspend/resume
						   speed mismatches */

/*
 * This should be set by platforms having multiple clock-domains, i.e.
 * supporting multiple policies. With this sysfs directories of governor would
 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
 * governor with different tunables for different clusters.
 */
#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)

/*
 * Driver will do POSTCHANGE notifications from outside of their ->target()
 * routine and so must set cpufreq_driver->flags with this flag, so that core
 * can handle them specially.
 */
#define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)

/*
 * Set by drivers which want cpufreq core to check if CPU is running at a
 * frequency present in freq-table exposed by the driver. For these drivers if
 * CPU is found running at an out of table freq, we will try to set it to a freq
 * from the table. And if that fails, we will stop further boot process by
 * issuing a BUG_ON().
 */
#define CPUFREQ_NEED_INITIAL_FREQ_CHECK	(1 << 5)

int cpufreq_register_driver(struct cpufreq_driver *driver_data);
int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);

const char *cpufreq_get_current_driver(void);
void *cpufreq_get_driver_data(void);

static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
		unsigned int min, unsigned int max)
{
	if (policy->min < min)
		policy->min = min;
	if (policy->max < min)
		policy->max = min;
	if (policy->min > max)
		policy->min = max;
	if (policy->max > max)
		policy->max = max;
	if (policy->min > policy->max)
		policy->min = policy->max;
	return;
}

static inline void
cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
{
	cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
			policy->cpuinfo.max_freq);
}

#ifdef CONFIG_CPU_FREQ
void cpufreq_suspend(void);
void cpufreq_resume(void);
int cpufreq_generic_suspend(struct cpufreq_policy *policy);
#else
static inline void cpufreq_suspend(void) {}
static inline void cpufreq_resume(void) {}
#endif

/*********************************************************************
 *                     CPUFREQ NOTIFIER INTERFACE                    *
 *********************************************************************/

#define CPUFREQ_TRANSITION_NOTIFIER	(0)
#define CPUFREQ_POLICY_NOTIFIER		(1)

/* Transition notifiers */
#define CPUFREQ_PRECHANGE		(0)
#define CPUFREQ_POSTCHANGE		(1)

/* Policy Notifiers  */
#define CPUFREQ_ADJUST			(0)
#define CPUFREQ_NOTIFY			(1)
#define CPUFREQ_START			(2)
#define CPUFREQ_CREATE_POLICY		(3)
#define CPUFREQ_REMOVE_POLICY		(4)

#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);

void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs);
void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs, int transition_failed);

#else /* CONFIG_CPU_FREQ */
static inline int cpufreq_register_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
						unsigned int list)
{
	return 0;
}
#endif /* !CONFIG_CPU_FREQ */

/**
 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
 * safe)
 * @old:   old value
 * @div:   divisor
 * @mult:  multiplier
 *
 *
 * new = old * mult / div
 */
static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
		u_int mult)
{
#if BITS_PER_LONG == 32
	u64 result = ((u64) old) * ((u64) mult);
	do_div(result, div);
	return (unsigned long) result;

#elif BITS_PER_LONG == 64
	unsigned long result = old * ((u64) mult);
	result /= div;
	return result;
#endif
}

/*********************************************************************
 *                          CPUFREQ GOVERNORS                        *
 *********************************************************************/

/*
 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
 * two generic policies are available:
 */
#define CPUFREQ_POLICY_POWERSAVE	(1)
#define CPUFREQ_POLICY_PERFORMANCE	(2)

/*
 * The polling frequency depends on the capability of the processor. Default
 * polling frequency is 1000 times the transition latency of the processor. The
 * ondemand governor will work on any processor with transition latency <= 10ms,
 * using appropriate sampling rate.
 *
 * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL)
 * the ondemand governor will not work. All times here are in us (microseconds).
 */
#define MIN_SAMPLING_RATE_RATIO		(2)
#define LATENCY_MULTIPLIER		(1000)
#define MIN_LATENCY_MULTIPLIER		(20)
#define TRANSITION_LATENCY_LIMIT	(10 * 1000 * 1000)

struct cpufreq_governor {
	char	name[CPUFREQ_NAME_LEN];
	int	(*init)(struct cpufreq_policy *policy);
	void	(*exit)(struct cpufreq_policy *policy);
	int	(*start)(struct cpufreq_policy *policy);
	void	(*stop)(struct cpufreq_policy *policy);
	void	(*limits)(struct cpufreq_policy *policy);
	ssize_t	(*show_setspeed)	(struct cpufreq_policy *policy,
					 char *buf);
	int	(*store_setspeed)	(struct cpufreq_policy *policy,
					 unsigned int freq);
	unsigned int max_transition_latency; /* HW must be able to switch to
			next freq faster than this value in nano secs or we
			will fallback to performance governor */
	struct list_head	governor_list;
	struct module		*owner;
};

/* Pass a target to the cpufreq driver */
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
					unsigned int target_freq);
int cpufreq_driver_target(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);
int __cpufreq_driver_target(struct cpufreq_policy *policy,
				   unsigned int target_freq,
				   unsigned int relation);
unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
					 unsigned int target_freq);
int cpufreq_register_governor(struct cpufreq_governor *governor);
void cpufreq_unregister_governor(struct cpufreq_governor *governor);

struct cpufreq_governor *cpufreq_default_governor(void);
struct cpufreq_governor *cpufreq_fallback_governor(void);

static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
{
	if (policy->max < policy->cur)
		__cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
	else if (policy->min > policy->cur)
		__cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
}

/* Governor attribute set */
struct gov_attr_set {
	struct kobject kobj;
	struct list_head policy_list;
	struct mutex update_lock;
	int usage_count;
};

/* sysfs ops for cpufreq governors */
extern const struct sysfs_ops governor_sysfs_ops;

void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);

/* Governor sysfs attribute */
struct governor_attr {
	struct attribute attr;
	ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
	ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
			 size_t count);
};

/*********************************************************************
 *                     FREQUENCY TABLE HELPERS                       *
 *********************************************************************/

/* Special Values of .frequency field */
#define CPUFREQ_ENTRY_INVALID	~0u
#define CPUFREQ_TABLE_END	~1u
/* Special Values of .flags field */
#define CPUFREQ_BOOST_FREQ	(1 << 0)

struct cpufreq_frequency_table {
	unsigned int	flags;
	unsigned int	driver_data; /* driver specific data, not used by core */
	unsigned int	frequency; /* kHz - doesn't need to be in ascending
				    * order */
};

#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
int dev_pm_opp_init_cpufreq_table(struct device *dev,
				  struct cpufreq_frequency_table **table);
void dev_pm_opp_free_cpufreq_table(struct device *dev,
				   struct cpufreq_frequency_table **table);
#else
static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
						struct cpufreq_frequency_table
						**table)
{
	return -EINVAL;
}

static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
						 struct cpufreq_frequency_table
						 **table)
{
}
#endif

/*
 * cpufreq_for_each_entry -	iterate over a cpufreq_frequency_table
 * @pos:	the cpufreq_frequency_table * to use as a loop cursor.
 * @table:	the cpufreq_frequency_table * to iterate over.
 */

#define cpufreq_for_each_entry(pos, table)	\
	for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)

/*
 * cpufreq_for_each_valid_entry -     iterate over a cpufreq_frequency_table
 *	excluding CPUFREQ_ENTRY_INVALID frequencies.
 * @pos:        the cpufreq_frequency_table * to use as a loop cursor.
 * @table:      the cpufreq_frequency_table * to iterate over.
 */

#define cpufreq_for_each_valid_entry(pos, table)			\
	for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)	\
		if (pos->frequency == CPUFREQ_ENTRY_INVALID)		\
			continue;					\
		else

int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
				    struct cpufreq_frequency_table *table);

int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
				   struct cpufreq_frequency_table *table);
int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);

int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
				 unsigned int target_freq,
				 unsigned int relation);
int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
		unsigned int freq);

ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);

#ifdef CONFIG_CPU_FREQ
int cpufreq_boost_trigger_state(int state);
int cpufreq_boost_enabled(void);
int cpufreq_enable_boost_support(void);
bool policy_has_boost_freq(struct cpufreq_policy *policy);

/* Find lowest freq at or above target in a table in ascending order */
static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq >= target_freq)
			return pos - table;

		best = pos;
	}

	return best - table;
}

/* Find lowest freq at or above target in a table in descending order */
static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq > target_freq) {
			best = pos;
			continue;
		}

		/* No freq found above target_freq */
		if (best == table - 1)
			return pos - table;

		return best - table;
	}

	return best - table;
}

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
					     unsigned int target_freq)
{
	target_freq = clamp_val(target_freq, policy->min, policy->max);

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_al(policy, target_freq);
	else
		return cpufreq_table_find_index_dl(policy, target_freq);
}

/* Find highest freq at or below target in a table in ascending order */
static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq < target_freq) {
			best = pos;
			continue;
		}

		/* No freq found below target_freq */
		if (best == table - 1)
			return pos - table;

		return best - table;
	}

	return best - table;
}

/* Find highest freq at or below target in a table in descending order */
static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq <= target_freq)
			return pos - table;

		best = pos;
	}

	return best - table;
}

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
					     unsigned int target_freq)
{
	target_freq = clamp_val(target_freq, policy->min, policy->max);

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_ah(policy, target_freq);
	else
		return cpufreq_table_find_index_dh(policy, target_freq);
}

/* Find closest freq to target in a table in ascending order */
static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq < target_freq) {
			best = pos;
			continue;
		}

		/* No freq found below target_freq */
		if (best == table - 1)
			return pos - table;

		/* Choose the closest freq */
		if (target_freq - best->frequency > freq - target_freq)
			return pos - table;

		return best - table;
	}

	return best - table;
}

/* Find closest freq to target in a table in descending order */
static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
					      unsigned int target_freq)
{
	struct cpufreq_frequency_table *table = policy->freq_table;
	struct cpufreq_frequency_table *pos, *best = table - 1;
	unsigned int freq;

	cpufreq_for_each_valid_entry(pos, table) {
		freq = pos->frequency;

		if (freq == target_freq)
			return pos - table;

		if (freq > target_freq) {
			best = pos;
			continue;
		}

		/* No freq found above target_freq */
		if (best == table - 1)
			return pos - table;

		/* Choose the closest freq */
		if (best->frequency - target_freq > target_freq - freq)
			return pos - table;

		return best - table;
	}

	return best - table;
}

/* Works only on sorted freq-tables */
static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
					     unsigned int target_freq)
{
	target_freq = clamp_val(target_freq, policy->min, policy->max);

	if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
		return cpufreq_table_find_index_ac(policy, target_freq);
	else
		return cpufreq_table_find_index_dc(policy, target_freq);
}

static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
						 unsigned int target_freq,
						 unsigned int relation)
{
	if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
		return cpufreq_table_index_unsorted(policy, target_freq,
						    relation);

	switch (relation) {
	case CPUFREQ_RELATION_L:
		return cpufreq_table_find_index_l(policy, target_freq);
	case CPUFREQ_RELATION_H:
		return cpufreq_table_find_index_h(policy, target_freq);
	case CPUFREQ_RELATION_C:
		return cpufreq_table_find_index_c(policy, target_freq);
	default:
		pr_err("%s: Invalid relation: %d\n", __func__, relation);
		return -EINVAL;
	}
}
#else
static inline int cpufreq_boost_trigger_state(int state)
{
	return 0;
}
static inline int cpufreq_boost_enabled(void)
{
	return 0;
}

static inline int cpufreq_enable_boost_support(void)
{
	return -EINVAL;
}

static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
{
	return false;
}
#endif

/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
extern struct freq_attr *cpufreq_generic_attr[];
int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
				      struct cpufreq_frequency_table *table);

unsigned int cpufreq_generic_get(unsigned int cpu);
int cpufreq_generic_init(struct cpufreq_policy *policy,
		struct cpufreq_frequency_table *table,
		unsigned int transition_latency);
#endif /* _LINUX_CPUFREQ_H */