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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Viresh Kumarbb176f72013-06-19 14:19:33 +05302 * linux/include/linux/cpufreq.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Viresh Kumarbb176f72013-06-19 14:19:33 +05304 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
Thiago Farina335dc332011-04-28 20:42:53 -03006 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#ifndef _LINUX_CPUFREQ_H
12#define _LINUX_CPUFREQ_H
13
Viresh Kumar652ed952014-01-09 20:38:43 +053014#include <linux/clk.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/cpumask.h>
Viresh Kumar5ff0a262013-08-06 22:53:03 +053016#include <linux/completion.h>
17#include <linux/kobject.h>
18#include <linux/notifier.h>
Srivatsa S. Bhat12478cf2014-03-24 13:35:44 +053019#include <linux/spinlock.h>
Viresh Kumar5ff0a262013-08-06 22:53:03 +053020#include <linux/sysfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Linus Torvalds1da177e2005-04-16 15:20:36 -070022/*********************************************************************
Viresh Kumar74aca952013-08-06 22:53:04 +053023 * CPUFREQ INTERFACE *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 *********************************************************************/
Viresh Kumar74aca952013-08-06 22:53:04 +053025/*
26 * Frequency values here are CPU kHz
27 *
Dave Jonesb53cc6e2005-05-31 19:03:47 -070028 * Maximum transition latency is in nanoseconds - if it's unknown,
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * CPUFREQ_ETERNAL shall be used.
30 */
31
Viresh Kumar74aca952013-08-06 22:53:04 +053032#define CPUFREQ_ETERNAL (-1)
33#define CPUFREQ_NAME_LEN 16
Viresh Kumar565ebe82017-02-03 15:26:25 +053034/* Print length for names. Extra 1 space for accommodating '\n' in prints */
Viresh Kumar74aca952013-08-06 22:53:04 +053035#define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1)
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037struct cpufreq_governor;
38
Viresh Kumarda0c6dc2016-06-27 16:04:07 +053039enum cpufreq_table_sorting {
40 CPUFREQ_TABLE_UNSORTED,
41 CPUFREQ_TABLE_SORTED_ASCENDING,
42 CPUFREQ_TABLE_SORTED_DESCENDING
43};
44
Viresh Kumar74aca952013-08-06 22:53:04 +053045struct cpufreq_freqs {
46 unsigned int cpu; /* cpu nr */
47 unsigned int old;
48 unsigned int new;
49 u8 flags; /* flags of cpufreq_driver, see below. */
50};
Thomas Renninger8aa84ad2009-07-24 15:25:05 +020051
Linus Torvalds1da177e2005-04-16 15:20:36 -070052struct cpufreq_cpuinfo {
53 unsigned int max_freq;
54 unsigned int min_freq;
Thiago Farina335dc332011-04-28 20:42:53 -030055
56 /* in 10^(-9) s = nanoseconds */
57 unsigned int transition_latency;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058};
59
Viresh Kumarc7a7b412015-08-03 08:36:19 +053060struct cpufreq_user_policy {
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 unsigned int min; /* in kHz */
62 unsigned int max; /* in kHz */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65struct cpufreq_policy {
Viresh Kumar951fc5f2013-01-31 02:03:53 +000066 /* CPUs sharing clock, require sw coordination */
67 cpumask_var_t cpus; /* Online CPUs only */
68 cpumask_var_t related_cpus; /* Online + Offline CPUs */
Rafael J. Wysocki559ed402015-07-26 02:07:47 +020069 cpumask_var_t real_cpus; /* Related and present */
Viresh Kumar951fc5f2013-01-31 02:03:53 +000070
Viresh Kumar62b36cc2013-02-01 06:40:02 +000071 unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
Venkatesh Pallipadi3b2d9942005-12-14 15:05:00 -050072 should set cpufreq */
Saravana Kannan9d16f202015-05-18 10:43:31 +053073 unsigned int cpu; /* cpu managing this policy, must be online */
Saravana Kannan9d16f202015-05-18 10:43:31 +053074
Viresh Kumar652ed952014-01-09 20:38:43 +053075 struct clk *clk;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 struct cpufreq_cpuinfo cpuinfo;/* see above */
77
78 unsigned int min; /* in kHz */
79 unsigned int max; /* in kHz */
80 unsigned int cur; /* in kHz, only needed if cpufreq
81 * governors are used */
Viresh Kumar1c03a2d2014-06-02 22:49:28 +053082 unsigned int restore_freq; /* = policy->cur before transition */
Viresh Kumare28867e2014-03-04 11:00:27 +080083 unsigned int suspend_freq; /* freq to set during suspend */
84
Thiago Farina335dc332011-04-28 20:42:53 -030085 unsigned int policy; /* see above */
Srinivas Pandruvada69030dd2015-12-01 16:52:14 -080086 unsigned int last_policy; /* policy before unplug */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 struct cpufreq_governor *governor; /* see below */
Viresh Kumar7bd353a2013-03-27 15:58:57 +000088 void *governor_data;
Viresh Kumar45732372015-05-12 12:22:34 +053089 char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 struct work_struct update; /* if update_policy() needs to be
92 * called, but you're in IRQ context */
93
Viresh Kumarc7a7b412015-08-03 08:36:19 +053094 struct cpufreq_user_policy user_policy;
Viresh Kumare0b31652014-03-10 14:53:33 +053095 struct cpufreq_frequency_table *freq_table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +053096 enum cpufreq_table_sorting freq_table_sorted;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Lukasz Majewskic88a1f82013-08-06 22:53:08 +053098 struct list_head policy_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 struct kobject kobj;
100 struct completion kobj_unregister;
viresh kumarad7722d2013-10-18 19:10:15 +0530101
102 /*
103 * The rules for this semaphore:
104 * - Any routine that wants to read from the policy structure will
105 * do a down_read on this semaphore.
106 * - Any routine that will write to the policy structure and/or may take away
107 * the policy altogether (eg. CPU hotplug), will hold this lock in write
108 * mode before doing so.
viresh kumarad7722d2013-10-18 19:10:15 +0530109 */
110 struct rw_semaphore rwsem;
Srivatsa S. Bhat12478cf2014-03-24 13:35:44 +0530111
Rafael J. Wysockib7898fd2016-03-30 03:47:49 +0200112 /*
113 * Fast switch flags:
114 * - fast_switch_possible should be set by the driver if it can
115 * guarantee that frequency can be changed on any CPU sharing the
116 * policy and that the change will affect all of the policy CPUs then.
117 * - fast_switch_enabled is to be set by governors that support fast
Viresh Kumar565ebe82017-02-03 15:26:25 +0530118 * frequency switching with the help of cpufreq_enable_fast_switch().
Rafael J. Wysockib7898fd2016-03-30 03:47:49 +0200119 */
120 bool fast_switch_possible;
121 bool fast_switch_enabled;
122
Rafael J. Wysocki1b72e7f2017-04-11 00:20:41 +0200123 /*
124 * Preferred average time interval between consecutive invocations of
125 * the driver to set the frequency for this policy. To be set by the
126 * scaling driver (0, which is the default, means no preference).
127 */
128 unsigned int transition_delay_us;
129
Viresh Kumar99d14d02017-07-28 12:16:39 +0530130 /*
131 * Remote DVFS flag (Not added to the driver structure as we don't want
132 * to access another structure from scheduler hotpath).
133 *
134 * Should be set if CPUs can do DVFS on behalf of other CPUs from
135 * different cpufreq policies.
136 */
137 bool dvfs_possible_from_any_cpu;
138
Steve Mucklee3c06232016-07-13 13:25:25 -0700139 /* Cached frequency lookup from cpufreq_driver_resolve_freq. */
140 unsigned int cached_target_freq;
141 int cached_resolved_idx;
142
Srivatsa S. Bhat12478cf2014-03-24 13:35:44 +0530143 /* Synchronization for frequency transitions */
144 bool transition_ongoing; /* Tracks transition status */
145 spinlock_t transition_lock;
146 wait_queue_head_t transition_wait;
Srivatsa S. Bhatca654dc2014-05-05 12:52:39 +0530147 struct task_struct *transition_task; /* Task which is doing the transition */
Viresh Kumar413fffc2014-08-28 11:22:23 +0530148
Viresh Kumara9aaf292015-01-13 11:34:00 +0530149 /* cpufreq-stats */
150 struct cpufreq_stats *stats;
151
Viresh Kumar413fffc2014-08-28 11:22:23 +0530152 /* For cpufreq driver's internal use */
153 void *driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154};
155
Viresh Kumar62b36cc2013-02-01 06:40:02 +0000156/* Only for ACPI */
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400157#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
158#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
159#define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */
160#define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Daniel Vetterc75b5052013-10-08 10:56:11 +0200162#ifdef CONFIG_CPU_FREQ
Rafael J. Wysocki1f0bd442015-09-16 02:17:49 +0200163struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
Viresh Kumar74aca952013-08-06 22:53:04 +0530164struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530165void cpufreq_cpu_put(struct cpufreq_policy *policy);
Daniel Vetterc75b5052013-10-08 10:56:11 +0200166#else
Rafael J. Wysocki1f0bd442015-09-16 02:17:49 +0200167static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
168{
169 return NULL;
170}
Daniel Vetterc75b5052013-10-08 10:56:11 +0200171static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
172{
173 return NULL;
174}
175static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
176#endif
Viresh Kumar74aca952013-08-06 22:53:04 +0530177
Fabio Baltieri2624f902013-01-31 09:44:40 +0000178static inline bool policy_is_shared(struct cpufreq_policy *policy)
179{
180 return cpumask_weight(policy->cpus) > 1;
181}
182
Viresh Kumar74aca952013-08-06 22:53:04 +0530183/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
184extern struct kobject *cpufreq_global_kobject;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Viresh Kumar74aca952013-08-06 22:53:04 +0530186#ifdef CONFIG_CPU_FREQ
187unsigned int cpufreq_get(unsigned int cpu);
188unsigned int cpufreq_quick_get(unsigned int cpu);
189unsigned int cpufreq_quick_get_max(unsigned int cpu);
190void disable_cpufreq(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Viresh Kumar74aca952013-08-06 22:53:04 +0530192u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy);
193int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu);
Rafael J. Wysocki30248fe2016-11-18 13:59:21 +0100194void cpufreq_update_policy(unsigned int cpu);
Viresh Kumar74aca952013-08-06 22:53:04 +0530195bool have_governor_per_policy(void);
196struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
Rafael J. Wysockib7898fd2016-03-30 03:47:49 +0200197void cpufreq_enable_fast_switch(struct cpufreq_policy *policy);
Rafael J. Wysocki6c9d9c82016-04-07 23:38:46 +0200198void cpufreq_disable_fast_switch(struct cpufreq_policy *policy);
Viresh Kumar74aca952013-08-06 22:53:04 +0530199#else
200static inline unsigned int cpufreq_get(unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Viresh Kumar74aca952013-08-06 22:53:04 +0530202 return 0;
203}
204static inline unsigned int cpufreq_quick_get(unsigned int cpu)
205{
206 return 0;
207}
208static inline unsigned int cpufreq_quick_get_max(unsigned int cpu)
209{
210 return 0;
211}
212static inline void disable_cpufreq(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Rafael J. Wysocki1aefc752016-05-31 22:14:44 +0200215#ifdef CONFIG_CPU_FREQ_STAT
216void cpufreq_stats_create_table(struct cpufreq_policy *policy);
217void cpufreq_stats_free_table(struct cpufreq_policy *policy);
218void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
219 unsigned int new_freq);
220#else
221static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { }
222static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { }
223static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy,
224 unsigned int new_freq) { }
225#endif /* CONFIG_CPU_FREQ_STAT */
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227/*********************************************************************
228 * CPUFREQ DRIVER INTERFACE *
229 *********************************************************************/
230
231#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
232#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */
Stratos Karafotis5b0c0b12014-06-30 19:59:33 +0300233#define CPUFREQ_RELATION_C 2 /* closest frequency to target */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Viresh Kumar74aca952013-08-06 22:53:04 +0530235struct freq_attr {
236 struct attribute attr;
237 ssize_t (*show)(struct cpufreq_policy *, char *);
238 ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
239};
240
241#define cpufreq_freq_attr_ro(_name) \
242static struct freq_attr _name = \
243__ATTR(_name, 0444, show_##_name, NULL)
244
245#define cpufreq_freq_attr_ro_perm(_name, _perm) \
246static struct freq_attr _name = \
247__ATTR(_name, _perm, show_##_name, NULL)
248
249#define cpufreq_freq_attr_rw(_name) \
250static struct freq_attr _name = \
251__ATTR(_name, 0644, show_##_name, store_##_name)
252
Markus Mayeree7930e2016-11-07 10:02:23 -0800253#define cpufreq_freq_attr_wo(_name) \
254static struct freq_attr _name = \
255__ATTR(_name, 0200, NULL, store_##_name)
256
Viresh Kumar74aca952013-08-06 22:53:04 +0530257#define define_one_global_ro(_name) \
Viresh Kumar85cf5512019-01-25 12:53:07 +0530258static struct kobj_attribute _name = \
Viresh Kumar74aca952013-08-06 22:53:04 +0530259__ATTR(_name, 0444, show_##_name, NULL)
260
261#define define_one_global_rw(_name) \
Viresh Kumar85cf5512019-01-25 12:53:07 +0530262static struct kobj_attribute _name = \
Viresh Kumar74aca952013-08-06 22:53:04 +0530263__ATTR(_name, 0644, show_##_name, store_##_name)
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266struct cpufreq_driver {
Viresh Kumar90452e62014-11-27 06:07:49 +0530267 char name[CPUFREQ_NAME_LEN];
268 u8 flags;
269 void *driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 /* needed by all drivers */
Viresh Kumar90452e62014-11-27 06:07:49 +0530272 int (*init)(struct cpufreq_policy *policy);
273 int (*verify)(struct cpufreq_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 /* define one out of two */
Viresh Kumar90452e62014-11-27 06:07:49 +0530276 int (*setpolicy)(struct cpufreq_policy *policy);
Viresh Kumar1c03a2d2014-06-02 22:49:28 +0530277
278 /*
279 * On failure, should always restore frequency to policy->restore_freq
280 * (i.e. old freq).
281 */
Viresh Kumar90452e62014-11-27 06:07:49 +0530282 int (*target)(struct cpufreq_policy *policy,
283 unsigned int target_freq,
284 unsigned int relation); /* Deprecated */
285 int (*target_index)(struct cpufreq_policy *policy,
286 unsigned int index);
Rafael J. Wysockib7898fd2016-03-30 03:47:49 +0200287 unsigned int (*fast_switch)(struct cpufreq_policy *policy,
288 unsigned int target_freq);
Steve Mucklee3c06232016-07-13 13:25:25 -0700289
290 /*
291 * Caches and returns the lowest driver-supported frequency greater than
292 * or equal to the target frequency, subject to any driver limitations.
293 * Does not set the frequency. Only to be implemented for drivers with
294 * target().
295 */
296 unsigned int (*resolve_freq)(struct cpufreq_policy *policy,
297 unsigned int target_freq);
298
Viresh Kumar1c03a2d2014-06-02 22:49:28 +0530299 /*
300 * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION
301 * unset.
302 *
303 * get_intermediate should return a stable intermediate frequency
304 * platform wants to switch to and target_intermediate() should set CPU
305 * to to that frequency, before jumping to the frequency corresponding
306 * to 'index'. Core will take care of sending notifications and driver
307 * doesn't have to handle them in target_intermediate() or
308 * target_index().
309 *
310 * Drivers can return '0' from get_intermediate() in case they don't
311 * wish to switch to intermediate frequency for some target frequency.
312 * In that case core will directly call ->target_index().
313 */
Viresh Kumar90452e62014-11-27 06:07:49 +0530314 unsigned int (*get_intermediate)(struct cpufreq_policy *policy,
315 unsigned int index);
316 int (*target_intermediate)(struct cpufreq_policy *policy,
317 unsigned int index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 /* should be defined, if possible */
Viresh Kumar90452e62014-11-27 06:07:49 +0530320 unsigned int (*get)(unsigned int cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 /* optional */
Viresh Kumar90452e62014-11-27 06:07:49 +0530323 int (*bios_limit)(int cpu, unsigned int *limit);
venkatesh.pallipadi@intel.combf0b90e2008-08-04 11:59:07 -0700324
Viresh Kumar90452e62014-11-27 06:07:49 +0530325 int (*exit)(struct cpufreq_policy *policy);
326 void (*stop_cpu)(struct cpufreq_policy *policy);
327 int (*suspend)(struct cpufreq_policy *policy);
328 int (*resume)(struct cpufreq_policy *policy);
Viresh Kumar7c45cf32014-11-27 06:07:51 +0530329
330 /* Will be called after the driver is fully initialized */
331 void (*ready)(struct cpufreq_policy *policy);
332
Viresh Kumar90452e62014-11-27 06:07:49 +0530333 struct freq_attr **attr;
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100334
335 /* platform specific boost support code */
Viresh Kumar90452e62014-11-27 06:07:49 +0530336 bool boost_enabled;
337 int (*set_boost)(int state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338};
339
340/* flags */
Viresh Kumar6461f012013-10-02 14:13:17 +0530341#define CPUFREQ_STICKY (1 << 0) /* driver isn't removed even if
342 all ->init() calls failed */
343#define CPUFREQ_CONST_LOOPS (1 << 1) /* loops_per_jiffy or other
344 kernel "constants" aren't
345 affected by frequency
346 transitions */
347#define CPUFREQ_PM_NO_WARN (1 << 2) /* don't warn on suspend/resume
348 speed mismatches */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Viresh Kumar0b981e72013-10-02 14:13:18 +0530350/*
351 * This should be set by platforms having multiple clock-domains, i.e.
352 * supporting multiple policies. With this sysfs directories of governor would
353 * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
354 * governor with different tunables for different clusters.
355 */
356#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
357
Viresh Kumar7dbf6942013-10-29 18:56:06 +0530358/*
359 * Driver will do POSTCHANGE notifications from outside of their ->target()
360 * routine and so must set cpufreq_driver->flags with this flag, so that core
361 * can handle them specially.
362 */
363#define CPUFREQ_ASYNC_NOTIFICATION (1 << 4)
364
Viresh Kumarae6b4272013-12-03 11:20:45 +0530365/*
366 * Set by drivers which want cpufreq core to check if CPU is running at a
367 * frequency present in freq-table exposed by the driver. For these drivers if
368 * CPU is found running at an out of table freq, we will try to set it to a freq
369 * from the table. And if that fails, we will stop further boot process by
370 * issuing a BUG_ON().
371 */
372#define CPUFREQ_NEED_INITIAL_FREQ_CHECK (1 << 5)
373
Viresh Kumarfe829ed2017-07-19 15:42:48 +0530374/*
375 * Set by drivers to disallow use of governors with "dynamic_switching" flag
376 * set.
377 */
378#define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING (1 << 6)
379
Linus Torvalds221dee22007-02-26 14:55:48 -0800380int cpufreq_register_driver(struct cpufreq_driver *driver_data);
381int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Viresh Kumar74aca952013-08-06 22:53:04 +0530383const char *cpufreq_get_current_driver(void);
Thomas Petazzoni51315cd2014-10-19 11:30:27 +0200384void *cpufreq_get_driver_data(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Viresh Kumarbb176f72013-06-19 14:19:33 +0530386static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
387 unsigned int min, unsigned int max)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388{
389 if (policy->min < min)
390 policy->min = min;
391 if (policy->max < min)
392 policy->max = min;
393 if (policy->min > max)
394 policy->min = max;
395 if (policy->max > max)
396 policy->max = max;
397 if (policy->min > policy->max)
398 policy->min = policy->max;
399 return;
400}
401
Viresh Kumarbe49e342013-10-02 14:13:19 +0530402static inline void
403cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
404{
405 cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
406 policy->cpuinfo.max_freq);
407}
408
Viresh Kumar2f0aea92014-03-04 11:00:26 +0800409#ifdef CONFIG_CPU_FREQ
410void cpufreq_suspend(void);
411void cpufreq_resume(void);
Viresh Kumare28867e2014-03-04 11:00:27 +0800412int cpufreq_generic_suspend(struct cpufreq_policy *policy);
Viresh Kumar2f0aea92014-03-04 11:00:26 +0800413#else
414static inline void cpufreq_suspend(void) {}
415static inline void cpufreq_resume(void) {}
416#endif
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418/*********************************************************************
Viresh Kumar74aca952013-08-06 22:53:04 +0530419 * CPUFREQ NOTIFIER INTERFACE *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 *********************************************************************/
421
Viresh Kumar74aca952013-08-06 22:53:04 +0530422#define CPUFREQ_TRANSITION_NOTIFIER (0)
423#define CPUFREQ_POLICY_NOTIFIER (1)
424
425/* Transition notifiers */
426#define CPUFREQ_PRECHANGE (0)
427#define CPUFREQ_POSTCHANGE (1)
Viresh Kumar74aca952013-08-06 22:53:04 +0530428
429/* Policy Notifiers */
430#define CPUFREQ_ADJUST (0)
Viresh Kumar6bfb7c72015-08-03 08:36:14 +0530431#define CPUFREQ_NOTIFY (1)
Viresh Kumar74aca952013-08-06 22:53:04 +0530432
433#ifdef CONFIG_CPU_FREQ
434int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);
435int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
436
Srivatsa S. Bhat12478cf2014-03-24 13:35:44 +0530437void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
438 struct cpufreq_freqs *freqs);
439void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
440 struct cpufreq_freqs *freqs, int transition_failed);
Viresh Kumar74aca952013-08-06 22:53:04 +0530441
442#else /* CONFIG_CPU_FREQ */
443static inline int cpufreq_register_notifier(struct notifier_block *nb,
444 unsigned int list)
445{
446 return 0;
447}
448static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
449 unsigned int list)
450{
451 return 0;
452}
453#endif /* !CONFIG_CPU_FREQ */
454
455/**
456 * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch
457 * safe)
458 * @old: old value
459 * @div: divisor
460 * @mult: multiplier
461 *
462 *
463 * new = old * mult / div
464 */
465static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
466 u_int mult)
467{
468#if BITS_PER_LONG == 32
469 u64 result = ((u64) old) * ((u64) mult);
470 do_div(result, div);
471 return (unsigned long) result;
472
473#elif BITS_PER_LONG == 64
474 unsigned long result = old * ((u64) mult);
475 result /= div;
476 return result;
477#endif
478}
479
480/*********************************************************************
481 * CPUFREQ GOVERNORS *
482 *********************************************************************/
483
484/*
485 * If (cpufreq_driver->target) exists, the ->governor decides what frequency
486 * within the limits is used. If (cpufreq_driver->setpolicy> exists, these
487 * two generic policies are available:
488 */
489#define CPUFREQ_POLICY_POWERSAVE (1)
490#define CPUFREQ_POLICY_PERFORMANCE (2)
491
Rafael J. Wysocki379480d2016-03-22 02:51:56 +0100492/*
493 * The polling frequency depends on the capability of the processor. Default
494 * polling frequency is 1000 times the transition latency of the processor. The
495 * ondemand governor will work on any processor with transition latency <= 10ms,
496 * using appropriate sampling rate.
Rafael J. Wysocki379480d2016-03-22 02:51:56 +0100497 */
Rafael J. Wysocki379480d2016-03-22 02:51:56 +0100498#define LATENCY_MULTIPLIER (1000)
Rafael J. Wysocki379480d2016-03-22 02:51:56 +0100499
Viresh Kumar74aca952013-08-06 22:53:04 +0530500struct cpufreq_governor {
501 char name[CPUFREQ_NAME_LEN];
Rafael J. Wysockie7888922016-06-02 23:24:15 +0200502 int (*init)(struct cpufreq_policy *policy);
503 void (*exit)(struct cpufreq_policy *policy);
504 int (*start)(struct cpufreq_policy *policy);
505 void (*stop)(struct cpufreq_policy *policy);
506 void (*limits)(struct cpufreq_policy *policy);
Viresh Kumar74aca952013-08-06 22:53:04 +0530507 ssize_t (*show_setspeed) (struct cpufreq_policy *policy,
508 char *buf);
509 int (*store_setspeed) (struct cpufreq_policy *policy,
510 unsigned int freq);
Viresh Kumared4676e2017-07-19 15:42:46 +0530511 /* For governors which change frequency dynamically by themselves */
512 bool dynamic_switching;
Viresh Kumar74aca952013-08-06 22:53:04 +0530513 struct list_head governor_list;
514 struct module *owner;
515};
516
517/* Pass a target to the cpufreq driver */
Rafael J. Wysockib7898fd2016-03-30 03:47:49 +0200518unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
519 unsigned int target_freq);
Viresh Kumar74aca952013-08-06 22:53:04 +0530520int cpufreq_driver_target(struct cpufreq_policy *policy,
521 unsigned int target_freq,
522 unsigned int relation);
523int __cpufreq_driver_target(struct cpufreq_policy *policy,
524 unsigned int target_freq,
525 unsigned int relation);
Steve Mucklee3c06232016-07-13 13:25:25 -0700526unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
527 unsigned int target_freq);
Viresh Kumaraa7519a2017-07-19 15:42:42 +0530528unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy);
Viresh Kumar74aca952013-08-06 22:53:04 +0530529int cpufreq_register_governor(struct cpufreq_governor *governor);
530void cpufreq_unregister_governor(struct cpufreq_governor *governor);
531
Rafael J. Wysockide1df262016-02-05 02:37:42 +0100532struct cpufreq_governor *cpufreq_default_governor(void);
533struct cpufreq_governor *cpufreq_fallback_governor(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
Viresh Kumarbf2be2d2016-05-18 17:55:31 +0530535static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy)
536{
537 if (policy->max < policy->cur)
538 __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H);
539 else if (policy->min > policy->cur)
540 __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L);
541}
542
Rafael J. Wysocki66893b62016-03-22 02:50:45 +0100543/* Governor attribute set */
544struct gov_attr_set {
545 struct kobject kobj;
546 struct list_head policy_list;
547 struct mutex update_lock;
548 int usage_count;
549};
550
551/* sysfs ops for cpufreq governors */
552extern const struct sysfs_ops governor_sysfs_ops;
553
554void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node);
555void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node);
556unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node);
557
558/* Governor sysfs attribute */
559struct governor_attr {
560 struct attribute attr;
561 ssize_t (*show)(struct gov_attr_set *attr_set, char *buf);
562 ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf,
563 size_t count);
564};
565
Viresh Kumar674e7542017-07-28 12:16:38 +0530566static inline bool cpufreq_can_do_remote_dvfs(struct cpufreq_policy *policy)
567{
Viresh Kumar99d14d02017-07-28 12:16:39 +0530568 /*
569 * Allow remote callbacks if:
570 * - dvfs_possible_from_any_cpu flag is set
571 * - the local and remote CPUs share cpufreq policy
572 */
Rafael J. Wysockid6344d42017-08-04 14:57:39 +0200573 return policy->dvfs_possible_from_any_cpu ||
574 cpumask_test_cpu(smp_processor_id(), policy->cpus);
Viresh Kumar674e7542017-07-28 12:16:38 +0530575}
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577/*********************************************************************
578 * FREQUENCY TABLE HELPERS *
579 *********************************************************************/
580
Viresh Kumar7f4b0462014-03-28 19:11:47 +0530581/* Special Values of .frequency field */
Brian W Hart2b1987a2014-06-27 16:09:39 -0500582#define CPUFREQ_ENTRY_INVALID ~0u
583#define CPUFREQ_TABLE_END ~1u
Viresh Kumar7f4b0462014-03-28 19:11:47 +0530584/* Special Values of .flags field */
585#define CPUFREQ_BOOST_FREQ (1 << 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587struct cpufreq_frequency_table {
Viresh Kumar7f4b0462014-03-28 19:11:47 +0530588 unsigned int flags;
Viresh Kumar50701582013-03-30 16:25:15 +0530589 unsigned int driver_data; /* driver specific data, not used by core */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 unsigned int frequency; /* kHz - doesn't need to be in ascending
591 * order */
592};
593
Nishanth Menona0dd7b72014-05-05 08:33:50 -0500594#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
595int dev_pm_opp_init_cpufreq_table(struct device *dev,
596 struct cpufreq_frequency_table **table);
597void dev_pm_opp_free_cpufreq_table(struct device *dev,
598 struct cpufreq_frequency_table **table);
599#else
600static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
601 struct cpufreq_frequency_table
602 **table)
603{
604 return -EINVAL;
605}
606
607static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
608 struct cpufreq_frequency_table
609 **table)
610{
611}
612#endif
613
Stratos Karafotis27e289d2014-04-25 23:15:23 +0300614/*
615 * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table
616 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
617 * @table: the cpufreq_frequency_table * to iterate over.
618 */
619
620#define cpufreq_for_each_entry(pos, table) \
621 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
622
623/*
624 * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
625 * excluding CPUFREQ_ENTRY_INVALID frequencies.
626 * @pos: the cpufreq_frequency_table * to use as a loop cursor.
627 * @table: the cpufreq_frequency_table * to iterate over.
628 */
629
Rafael J. Wysocki34b08702016-02-26 00:22:57 +0100630#define cpufreq_for_each_valid_entry(pos, table) \
631 for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \
632 if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
633 continue; \
634 else
Stratos Karafotis27e289d2014-04-25 23:15:23 +0300635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
637 struct cpufreq_frequency_table *table);
638
639int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
640 struct cpufreq_frequency_table *table);
Viresh Kumar18434512013-10-03 20:27:55 +0530641int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530643int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
644 unsigned int target_freq,
645 unsigned int relation);
Viresh Kumard3916692013-12-03 11:20:46 +0530646int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
647 unsigned int freq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Viresh Kumar74aca952013-08-06 22:53:04 +0530649ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf);
650
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100651#ifdef CONFIG_CPU_FREQ
652int cpufreq_boost_trigger_state(int state);
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100653int cpufreq_boost_enabled(void);
Viresh Kumar44139ed2015-07-29 16:23:09 +0530654int cpufreq_enable_boost_support(void);
655bool policy_has_boost_freq(struct cpufreq_policy *policy);
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530656
657/* Find lowest freq at or above target in a table in ascending order */
658static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
659 unsigned int target_freq)
660{
661 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530662 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530663 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530664
Aaro Koskinen899bb662016-10-12 08:45:05 +0530665 cpufreq_for_each_valid_entry(pos, table) {
666 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530667
668 if (freq >= target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530669 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530670
Aaro Koskinen899bb662016-10-12 08:45:05 +0530671 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530672 }
673
Aaro Koskinen899bb662016-10-12 08:45:05 +0530674 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530675}
676
677/* Find lowest freq at or above target in a table in descending order */
678static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
679 unsigned int target_freq)
680{
681 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530682 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530683 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530684
Aaro Koskinen899bb662016-10-12 08:45:05 +0530685 cpufreq_for_each_valid_entry(pos, table) {
686 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530687
688 if (freq == target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530689 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530690
691 if (freq > target_freq) {
Aaro Koskinen899bb662016-10-12 08:45:05 +0530692 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530693 continue;
694 }
695
696 /* No freq found above target_freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530697 if (best == table - 1)
698 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530699
Sergey Senozhatskyc6fe46a2016-10-18 00:41:12 +0900700 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530701 }
702
Sergey Senozhatskyc6fe46a2016-10-18 00:41:12 +0900703 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530704}
705
706/* Works only on sorted freq-tables */
707static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
708 unsigned int target_freq)
709{
710 target_freq = clamp_val(target_freq, policy->min, policy->max);
711
712 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
713 return cpufreq_table_find_index_al(policy, target_freq);
714 else
715 return cpufreq_table_find_index_dl(policy, target_freq);
716}
717
718/* Find highest freq at or below target in a table in ascending order */
719static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
720 unsigned int target_freq)
721{
722 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530723 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530724 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530725
Aaro Koskinen899bb662016-10-12 08:45:05 +0530726 cpufreq_for_each_valid_entry(pos, table) {
727 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530728
729 if (freq == target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530730 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530731
732 if (freq < target_freq) {
Aaro Koskinen899bb662016-10-12 08:45:05 +0530733 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530734 continue;
735 }
736
737 /* No freq found below target_freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530738 if (best == table - 1)
739 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530740
Aaro Koskinen899bb662016-10-12 08:45:05 +0530741 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530742 }
743
Aaro Koskinen899bb662016-10-12 08:45:05 +0530744 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530745}
746
747/* Find highest freq at or below target in a table in descending order */
748static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
749 unsigned int target_freq)
750{
751 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530752 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530753 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530754
Aaro Koskinen899bb662016-10-12 08:45:05 +0530755 cpufreq_for_each_valid_entry(pos, table) {
756 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530757
758 if (freq <= target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530759 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530760
Aaro Koskinen899bb662016-10-12 08:45:05 +0530761 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530762 }
763
Aaro Koskinen899bb662016-10-12 08:45:05 +0530764 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530765}
766
767/* Works only on sorted freq-tables */
768static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
769 unsigned int target_freq)
770{
771 target_freq = clamp_val(target_freq, policy->min, policy->max);
772
773 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
774 return cpufreq_table_find_index_ah(policy, target_freq);
775 else
776 return cpufreq_table_find_index_dh(policy, target_freq);
777}
778
779/* Find closest freq to target in a table in ascending order */
780static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
781 unsigned int target_freq)
782{
783 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530784 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530785 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530786
Aaro Koskinen899bb662016-10-12 08:45:05 +0530787 cpufreq_for_each_valid_entry(pos, table) {
788 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530789
790 if (freq == target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530791 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530792
793 if (freq < target_freq) {
Aaro Koskinen899bb662016-10-12 08:45:05 +0530794 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530795 continue;
796 }
797
798 /* No freq found below target_freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530799 if (best == table - 1)
800 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530801
802 /* Choose the closest freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530803 if (target_freq - best->frequency > freq - target_freq)
804 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530805
Aaro Koskinen899bb662016-10-12 08:45:05 +0530806 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530807 }
808
Aaro Koskinen899bb662016-10-12 08:45:05 +0530809 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530810}
811
812/* Find closest freq to target in a table in descending order */
813static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
814 unsigned int target_freq)
815{
816 struct cpufreq_frequency_table *table = policy->freq_table;
Aaro Koskinen899bb662016-10-12 08:45:05 +0530817 struct cpufreq_frequency_table *pos, *best = table - 1;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530818 unsigned int freq;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530819
Aaro Koskinen899bb662016-10-12 08:45:05 +0530820 cpufreq_for_each_valid_entry(pos, table) {
821 freq = pos->frequency;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530822
823 if (freq == target_freq)
Aaro Koskinen899bb662016-10-12 08:45:05 +0530824 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530825
826 if (freq > target_freq) {
Aaro Koskinen899bb662016-10-12 08:45:05 +0530827 best = pos;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530828 continue;
829 }
830
831 /* No freq found above target_freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530832 if (best == table - 1)
833 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530834
835 /* Choose the closest freq */
Aaro Koskinen899bb662016-10-12 08:45:05 +0530836 if (best->frequency - target_freq > target_freq - freq)
837 return pos - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530838
Aaro Koskinen899bb662016-10-12 08:45:05 +0530839 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530840 }
841
Aaro Koskinen899bb662016-10-12 08:45:05 +0530842 return best - table;
Viresh Kumarda0c6dc2016-06-27 16:04:07 +0530843}
844
845/* Works only on sorted freq-tables */
846static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
847 unsigned int target_freq)
848{
849 target_freq = clamp_val(target_freq, policy->min, policy->max);
850
851 if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
852 return cpufreq_table_find_index_ac(policy, target_freq);
853 else
854 return cpufreq_table_find_index_dc(policy, target_freq);
855}
856
857static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
858 unsigned int target_freq,
859 unsigned int relation)
860{
861 if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
862 return cpufreq_table_index_unsorted(policy, target_freq,
863 relation);
864
865 switch (relation) {
866 case CPUFREQ_RELATION_L:
867 return cpufreq_table_find_index_l(policy, target_freq);
868 case CPUFREQ_RELATION_H:
869 return cpufreq_table_find_index_h(policy, target_freq);
870 case CPUFREQ_RELATION_C:
871 return cpufreq_table_find_index_c(policy, target_freq);
872 default:
873 pr_err("%s: Invalid relation: %d\n", __func__, relation);
874 return -EINVAL;
875 }
876}
Viresh Kumar55d85292017-04-25 15:57:15 +0530877
878static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy)
879{
880 struct cpufreq_frequency_table *pos;
881 int count = 0;
882
883 if (unlikely(!policy->freq_table))
884 return 0;
885
886 cpufreq_for_each_valid_entry(pos, policy->freq_table)
887 count++;
888
889 return count;
890}
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100891#else
892static inline int cpufreq_boost_trigger_state(int state)
893{
894 return 0;
895}
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100896static inline int cpufreq_boost_enabled(void)
897{
898 return 0;
899}
Viresh Kumar44139ed2015-07-29 16:23:09 +0530900
901static inline int cpufreq_enable_boost_support(void)
902{
903 return -EINVAL;
904}
905
906static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
907{
908 return false;
909}
Lukasz Majewski6f19efc2013-12-20 15:24:49 +0100910#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
Rafael J. Wysocki22af48b2017-11-15 02:13:40 +0100912extern void arch_freq_prepare_all(void);
Len Brownf8475ce2017-06-23 22:11:52 -0700913extern unsigned int arch_freq_get_on_cpu(int cpu);
914
Dietmar Eggemann5afe8342017-07-22 18:13:50 +0100915extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
916 unsigned long max_freq);
Dietmar Eggemannb6a1f3e2018-05-10 16:52:33 +0100917extern void arch_set_max_freq_scale(struct cpumask *cpus,
918 unsigned long policy_max_freq);
Dietmar Eggemann5afe8342017-07-22 18:13:50 +0100919
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920/* the following are really really optional */
921extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
Bartlomiej Zolnierkiewicz21c36d32015-08-07 13:59:16 +0200922extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;
Viresh Kumar18434512013-10-03 20:27:55 +0530923extern struct freq_attr *cpufreq_generic_attr[];
Viresh Kumar27047a62013-09-16 18:56:03 +0530924int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
925 struct cpufreq_frequency_table *table);
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800926
Viresh Kumar652ed952014-01-09 20:38:43 +0530927unsigned int cpufreq_generic_get(unsigned int cpu);
Viresh Kumar70e9e772013-10-03 20:29:07 +0530928int cpufreq_generic_init(struct cpufreq_policy *policy,
929 struct cpufreq_frequency_table *table,
930 unsigned int transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931#endif /* _LINUX_CPUFREQ_H */