Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
bb176f7d | 2 | * linux/include/linux/cpufreq.h |
1da177e4 | 3 | * |
bb176f7d VK |
4 | * Copyright (C) 2001 Russell King |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
335dc333 | 6 | * |
1da177e4 LT |
7 | * 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 | ||
652ed95d | 14 | #include <linux/clk.h> |
5ff0a268 VK |
15 | #include <linux/cpumask.h> |
16 | #include <linux/completion.h> | |
1da177e4 | 17 | #include <linux/kobject.h> |
5ff0a268 | 18 | #include <linux/notifier.h> |
12478cf0 | 19 | #include <linux/spinlock.h> |
1da177e4 | 20 | #include <linux/sysfs.h> |
1da177e4 | 21 | |
1da177e4 | 22 | /********************************************************************* |
74aca95d | 23 | * CPUFREQ INTERFACE * |
1da177e4 | 24 | *********************************************************************/ |
74aca95d VK |
25 | /* |
26 | * Frequency values here are CPU kHz | |
27 | * | |
b53cc6ea | 28 | * Maximum transition latency is in nanoseconds - if it's unknown, |
1da177e4 LT |
29 | * CPUFREQ_ETERNAL shall be used. |
30 | */ | |
31 | ||
74aca95d VK |
32 | #define CPUFREQ_ETERNAL (-1) |
33 | #define CPUFREQ_NAME_LEN 16 | |
565ebe80 | 34 | /* Print length for names. Extra 1 space for accommodating '\n' in prints */ |
74aca95d VK |
35 | #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) |
36 | ||
1da177e4 LT |
37 | struct cpufreq_governor; |
38 | ||
da0c6dc0 VK |
39 | enum cpufreq_table_sorting { |
40 | CPUFREQ_TABLE_UNSORTED, | |
41 | CPUFREQ_TABLE_SORTED_ASCENDING, | |
42 | CPUFREQ_TABLE_SORTED_DESCENDING | |
43 | }; | |
44 | ||
74aca95d VK |
45 | struct 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 | }; | |
8aa84ad8 | 51 | |
1da177e4 LT |
52 | struct cpufreq_cpuinfo { |
53 | unsigned int max_freq; | |
54 | unsigned int min_freq; | |
335dc333 TF |
55 | |
56 | /* in 10^(-9) s = nanoseconds */ | |
57 | unsigned int transition_latency; | |
1da177e4 LT |
58 | }; |
59 | ||
c7a7b418 | 60 | struct cpufreq_user_policy { |
1da177e4 LT |
61 | unsigned int min; /* in kHz */ |
62 | unsigned int max; /* in kHz */ | |
1da177e4 LT |
63 | }; |
64 | ||
65 | struct cpufreq_policy { | |
951fc5f4 VK |
66 | /* CPUs sharing clock, require sw coordination */ |
67 | cpumask_var_t cpus; /* Online CPUs only */ | |
68 | cpumask_var_t related_cpus; /* Online + Offline CPUs */ | |
559ed407 | 69 | cpumask_var_t real_cpus; /* Related and present */ |
951fc5f4 | 70 | |
62b36cc1 | 71 | unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
3b2d9942 | 72 | should set cpufreq */ |
9d16f207 | 73 | unsigned int cpu; /* cpu managing this policy, must be online */ |
9d16f207 | 74 | |
652ed95d | 75 | struct clk *clk; |
1da177e4 LT |
76 | 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 */ | |
1c03a2d0 | 82 | unsigned int restore_freq; /* = policy->cur before transition */ |
e28867ea VK |
83 | unsigned int suspend_freq; /* freq to set during suspend */ |
84 | ||
335dc333 | 85 | unsigned int policy; /* see above */ |
69030dd1 | 86 | unsigned int last_policy; /* policy before unplug */ |
1da177e4 | 87 | struct cpufreq_governor *governor; /* see below */ |
7bd353a9 | 88 | void *governor_data; |
4573237b | 89 | char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ |
1da177e4 | 90 | |
1da177e4 LT |
91 | struct work_struct update; /* if update_policy() needs to be |
92 | * called, but you're in IRQ context */ | |
93 | ||
c7a7b418 | 94 | struct cpufreq_user_policy user_policy; |
e0b3165b | 95 | struct cpufreq_frequency_table *freq_table; |
da0c6dc0 | 96 | enum cpufreq_table_sorting freq_table_sorted; |
1da177e4 | 97 | |
c88a1f8b | 98 | struct list_head policy_list; |
1da177e4 LT |
99 | struct kobject kobj; |
100 | struct completion kobj_unregister; | |
ad7722da | 101 | |
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. | |
ad7722da | 109 | */ |
110 | struct rw_semaphore rwsem; | |
12478cf0 | 111 | |
b7898fda RW |
112 | /* |
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 | |
565ebe80 | 118 | * frequency switching with the help of cpufreq_enable_fast_switch(). |
b7898fda RW |
119 | */ |
120 | bool fast_switch_possible; | |
121 | bool fast_switch_enabled; | |
122 | ||
1b72e7fd RW |
123 | /* |
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 | ||
99d14d0e VK |
130 | /* |
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 | ||
e3c06236 SM |
139 | /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ |
140 | unsigned int cached_target_freq; | |
141 | int cached_resolved_idx; | |
142 | ||
12478cf0 SB |
143 | /* Synchronization for frequency transitions */ |
144 | bool transition_ongoing; /* Tracks transition status */ | |
145 | spinlock_t transition_lock; | |
146 | wait_queue_head_t transition_wait; | |
ca654dc3 | 147 | struct task_struct *transition_task; /* Task which is doing the transition */ |
413fffc3 | 148 | |
a9aaf291 VK |
149 | /* cpufreq-stats */ |
150 | struct cpufreq_stats *stats; | |
151 | ||
413fffc3 VK |
152 | /* For cpufreq driver's internal use */ |
153 | void *driver_data; | |
5c238a8b AK |
154 | |
155 | /* Pointer to the cooling device if used for thermal mitigation */ | |
156 | struct thermal_cooling_device *cdev; | |
1da177e4 LT |
157 | }; |
158 | ||
62b36cc1 | 159 | /* Only for ACPI */ |
46f18e3a VP |
160 | #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
161 | #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ | |
162 | #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ | |
163 | #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ | |
1da177e4 | 164 | |
c75b505d | 165 | #ifdef CONFIG_CPU_FREQ |
1f0bd44e | 166 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
74aca95d | 167 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
3a3e9e06 | 168 | void cpufreq_cpu_put(struct cpufreq_policy *policy); |
c75b505d | 169 | #else |
1f0bd44e RW |
170 | static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
171 | { | |
172 | return NULL; | |
173 | } | |
c75b505d DV |
174 | static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
175 | { | |
176 | return NULL; | |
177 | } | |
178 | static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } | |
179 | #endif | |
74aca95d | 180 | |
2624f90c FB |
181 | static inline bool policy_is_shared(struct cpufreq_policy *policy) |
182 | { | |
183 | return cpumask_weight(policy->cpus) > 1; | |
184 | } | |
185 | ||
74aca95d VK |
186 | /* /sys/devices/system/cpu/cpufreq: entry point for global variables */ |
187 | extern struct kobject *cpufreq_global_kobject; | |
1da177e4 | 188 | |
74aca95d VK |
189 | #ifdef CONFIG_CPU_FREQ |
190 | unsigned int cpufreq_get(unsigned int cpu); | |
191 | unsigned int cpufreq_quick_get(unsigned int cpu); | |
192 | unsigned int cpufreq_quick_get_max(unsigned int cpu); | |
193 | void disable_cpufreq(void); | |
1da177e4 | 194 | |
74aca95d VK |
195 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
196 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); | |
30248fef | 197 | void cpufreq_update_policy(unsigned int cpu); |
74aca95d VK |
198 | bool have_governor_per_policy(void); |
199 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); | |
b7898fda | 200 | void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); |
6c9d9c81 | 201 | void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); |
74aca95d VK |
202 | #else |
203 | static inline unsigned int cpufreq_get(unsigned int cpu) | |
1da177e4 | 204 | { |
74aca95d VK |
205 | return 0; |
206 | } | |
207 | static inline unsigned int cpufreq_quick_get(unsigned int cpu) | |
208 | { | |
209 | return 0; | |
210 | } | |
211 | static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
212 | { | |
213 | return 0; | |
214 | } | |
215 | static inline void disable_cpufreq(void) { } | |
1da177e4 | 216 | #endif |
1da177e4 | 217 | |
1aefc75b RW |
218 | #ifdef CONFIG_CPU_FREQ_STAT |
219 | void cpufreq_stats_create_table(struct cpufreq_policy *policy); | |
220 | void cpufreq_stats_free_table(struct cpufreq_policy *policy); | |
221 | void cpufreq_stats_record_transition(struct cpufreq_policy *policy, | |
222 | unsigned int new_freq); | |
223 | #else | |
224 | static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } | |
225 | static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } | |
226 | static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, | |
227 | unsigned int new_freq) { } | |
228 | #endif /* CONFIG_CPU_FREQ_STAT */ | |
229 | ||
1da177e4 | 230 | /********************************************************************* |
74aca95d | 231 | * CPUFREQ DRIVER INTERFACE * |
1da177e4 LT |
232 | *********************************************************************/ |
233 | ||
74aca95d VK |
234 | #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
235 | #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ | |
5b0c0b16 | 236 | #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ |
1da177e4 | 237 | |
74aca95d VK |
238 | struct freq_attr { |
239 | struct attribute attr; | |
240 | ssize_t (*show)(struct cpufreq_policy *, char *); | |
241 | ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); | |
1da177e4 LT |
242 | }; |
243 | ||
74aca95d VK |
244 | #define cpufreq_freq_attr_ro(_name) \ |
245 | static struct freq_attr _name = \ | |
246 | __ATTR(_name, 0444, show_##_name, NULL) | |
1da177e4 | 247 | |
74aca95d VK |
248 | #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
249 | static struct freq_attr _name = \ | |
250 | __ATTR(_name, _perm, show_##_name, NULL) | |
1da177e4 | 251 | |
74aca95d VK |
252 | #define cpufreq_freq_attr_rw(_name) \ |
253 | static struct freq_attr _name = \ | |
254 | __ATTR(_name, 0644, show_##_name, store_##_name) | |
255 | ||
ee7930ee MM |
256 | #define cpufreq_freq_attr_wo(_name) \ |
257 | static struct freq_attr _name = \ | |
258 | __ATTR(_name, 0200, NULL, store_##_name) | |
259 | ||
74aca95d | 260 | #define define_one_global_ro(_name) \ |
625c85a6 | 261 | static struct kobj_attribute _name = \ |
74aca95d VK |
262 | __ATTR(_name, 0444, show_##_name, NULL) |
263 | ||
264 | #define define_one_global_rw(_name) \ | |
625c85a6 | 265 | static struct kobj_attribute _name = \ |
74aca95d | 266 | __ATTR(_name, 0644, show_##_name, store_##_name) |
1da177e4 | 267 | |
1da177e4 LT |
268 | |
269 | struct cpufreq_driver { | |
90452e61 VK |
270 | char name[CPUFREQ_NAME_LEN]; |
271 | u8 flags; | |
272 | void *driver_data; | |
1da177e4 LT |
273 | |
274 | /* needed by all drivers */ | |
90452e61 VK |
275 | int (*init)(struct cpufreq_policy *policy); |
276 | int (*verify)(struct cpufreq_policy *policy); | |
1da177e4 LT |
277 | |
278 | /* define one out of two */ | |
90452e61 | 279 | int (*setpolicy)(struct cpufreq_policy *policy); |
1c03a2d0 VK |
280 | |
281 | /* | |
282 | * On failure, should always restore frequency to policy->restore_freq | |
283 | * (i.e. old freq). | |
284 | */ | |
90452e61 VK |
285 | int (*target)(struct cpufreq_policy *policy, |
286 | unsigned int target_freq, | |
287 | unsigned int relation); /* Deprecated */ | |
288 | int (*target_index)(struct cpufreq_policy *policy, | |
289 | unsigned int index); | |
b7898fda RW |
290 | unsigned int (*fast_switch)(struct cpufreq_policy *policy, |
291 | unsigned int target_freq); | |
e3c06236 SM |
292 | |
293 | /* | |
294 | * Caches and returns the lowest driver-supported frequency greater than | |
295 | * or equal to the target frequency, subject to any driver limitations. | |
296 | * Does not set the frequency. Only to be implemented for drivers with | |
297 | * target(). | |
298 | */ | |
299 | unsigned int (*resolve_freq)(struct cpufreq_policy *policy, | |
300 | unsigned int target_freq); | |
301 | ||
1c03a2d0 VK |
302 | /* |
303 | * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION | |
304 | * unset. | |
305 | * | |
306 | * get_intermediate should return a stable intermediate frequency | |
307 | * platform wants to switch to and target_intermediate() should set CPU | |
308 | * to to that frequency, before jumping to the frequency corresponding | |
309 | * to 'index'. Core will take care of sending notifications and driver | |
310 | * doesn't have to handle them in target_intermediate() or | |
311 | * target_index(). | |
312 | * | |
313 | * Drivers can return '0' from get_intermediate() in case they don't | |
314 | * wish to switch to intermediate frequency for some target frequency. | |
315 | * In that case core will directly call ->target_index(). | |
316 | */ | |
90452e61 VK |
317 | unsigned int (*get_intermediate)(struct cpufreq_policy *policy, |
318 | unsigned int index); | |
319 | int (*target_intermediate)(struct cpufreq_policy *policy, | |
320 | unsigned int index); | |
1da177e4 LT |
321 | |
322 | /* should be defined, if possible */ | |
90452e61 | 323 | unsigned int (*get)(unsigned int cpu); |
1da177e4 LT |
324 | |
325 | /* optional */ | |
90452e61 | 326 | int (*bios_limit)(int cpu, unsigned int *limit); |
bf0b90e3 | 327 | |
91a12e91 VK |
328 | int (*online)(struct cpufreq_policy *policy); |
329 | int (*offline)(struct cpufreq_policy *policy); | |
90452e61 VK |
330 | int (*exit)(struct cpufreq_policy *policy); |
331 | void (*stop_cpu)(struct cpufreq_policy *policy); | |
332 | int (*suspend)(struct cpufreq_policy *policy); | |
333 | int (*resume)(struct cpufreq_policy *policy); | |
7c45cf31 VK |
334 | |
335 | /* Will be called after the driver is fully initialized */ | |
336 | void (*ready)(struct cpufreq_policy *policy); | |
337 | ||
90452e61 | 338 | struct freq_attr **attr; |
6f19efc0 LM |
339 | |
340 | /* platform specific boost support code */ | |
90452e61 VK |
341 | bool boost_enabled; |
342 | int (*set_boost)(int state); | |
1da177e4 LT |
343 | }; |
344 | ||
345 | /* flags */ | |
8321be6a AK |
346 | |
347 | /* driver isn't removed even if all ->init() calls failed */ | |
348 | #define CPUFREQ_STICKY BIT(0) | |
349 | ||
350 | /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */ | |
351 | #define CPUFREQ_CONST_LOOPS BIT(1) | |
352 | ||
353 | /* don't warn on suspend/resume speed mismatches */ | |
354 | #define CPUFREQ_PM_NO_WARN BIT(2) | |
1da177e4 | 355 | |
0b981e70 VK |
356 | /* |
357 | * This should be set by platforms having multiple clock-domains, i.e. | |
358 | * supporting multiple policies. With this sysfs directories of governor would | |
359 | * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same | |
360 | * governor with different tunables for different clusters. | |
361 | */ | |
8321be6a | 362 | #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY BIT(3) |
0b981e70 | 363 | |
7dbf694d VK |
364 | /* |
365 | * Driver will do POSTCHANGE notifications from outside of their ->target() | |
366 | * routine and so must set cpufreq_driver->flags with this flag, so that core | |
367 | * can handle them specially. | |
368 | */ | |
8321be6a | 369 | #define CPUFREQ_ASYNC_NOTIFICATION BIT(4) |
7dbf694d | 370 | |
ae6b4271 VK |
371 | /* |
372 | * Set by drivers which want cpufreq core to check if CPU is running at a | |
373 | * frequency present in freq-table exposed by the driver. For these drivers if | |
374 | * CPU is found running at an out of table freq, we will try to set it to a freq | |
375 | * from the table. And if that fails, we will stop further boot process by | |
376 | * issuing a BUG_ON(). | |
377 | */ | |
8321be6a | 378 | #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5) |
ae6b4271 | 379 | |
fe829ed8 VK |
380 | /* |
381 | * Set by drivers to disallow use of governors with "dynamic_switching" flag | |
382 | * set. | |
383 | */ | |
8321be6a | 384 | #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING BIT(6) |
fe829ed8 | 385 | |
5c238a8b AK |
386 | /* |
387 | * Set by drivers that want the core to automatically register the cpufreq | |
388 | * driver as a thermal cooling device. | |
389 | */ | |
390 | #define CPUFREQ_IS_COOLING_DEV BIT(7) | |
391 | ||
221dee28 LT |
392 | int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
393 | int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); | |
1da177e4 | 394 | |
74aca95d | 395 | const char *cpufreq_get_current_driver(void); |
51315cdf | 396 | void *cpufreq_get_driver_data(void); |
1da177e4 | 397 | |
bb176f7d VK |
398 | static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy, |
399 | unsigned int min, unsigned int max) | |
1da177e4 LT |
400 | { |
401 | if (policy->min < min) | |
402 | policy->min = min; | |
403 | if (policy->max < min) | |
404 | policy->max = min; | |
405 | if (policy->min > max) | |
406 | policy->min = max; | |
407 | if (policy->max > max) | |
408 | policy->max = max; | |
409 | if (policy->min > policy->max) | |
410 | policy->min = policy->max; | |
411 | return; | |
412 | } | |
413 | ||
be49e346 VK |
414 | static inline void |
415 | cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy) | |
416 | { | |
417 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, | |
418 | policy->cpuinfo.max_freq); | |
419 | } | |
420 | ||
2f0aea93 VK |
421 | #ifdef CONFIG_CPU_FREQ |
422 | void cpufreq_suspend(void); | |
423 | void cpufreq_resume(void); | |
e28867ea | 424 | int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
2f0aea93 VK |
425 | #else |
426 | static inline void cpufreq_suspend(void) {} | |
427 | static inline void cpufreq_resume(void) {} | |
428 | #endif | |
429 | ||
74aca95d VK |
430 | /********************************************************************* |
431 | * CPUFREQ NOTIFIER INTERFACE * | |
432 | *********************************************************************/ | |
6dad2a29 | 433 | |
74aca95d VK |
434 | #define CPUFREQ_TRANSITION_NOTIFIER (0) |
435 | #define CPUFREQ_POLICY_NOTIFIER (1) | |
1da177e4 | 436 | |
74aca95d VK |
437 | /* Transition notifiers */ |
438 | #define CPUFREQ_PRECHANGE (0) | |
439 | #define CPUFREQ_POSTCHANGE (1) | |
6dad2a29 | 440 | |
74aca95d VK |
441 | /* Policy Notifiers */ |
442 | #define CPUFREQ_ADJUST (0) | |
6bfb7c74 | 443 | #define CPUFREQ_NOTIFY (1) |
6dad2a29 | 444 | |
74aca95d VK |
445 | #ifdef CONFIG_CPU_FREQ |
446 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); | |
447 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); | |
6dad2a29 | 448 | |
12478cf0 SB |
449 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
450 | struct cpufreq_freqs *freqs); | |
451 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
452 | struct cpufreq_freqs *freqs, int transition_failed); | |
1da177e4 | 453 | |
74aca95d VK |
454 | #else /* CONFIG_CPU_FREQ */ |
455 | static inline int cpufreq_register_notifier(struct notifier_block *nb, | |
456 | unsigned int list) | |
2eca40a8 RD |
457 | { |
458 | return 0; | |
459 | } | |
74aca95d VK |
460 | static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
461 | unsigned int list) | |
95235ca2 VP |
462 | { |
463 | return 0; | |
464 | } | |
74aca95d VK |
465 | #endif /* !CONFIG_CPU_FREQ */ |
466 | ||
467 | /** | |
468 | * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch | |
469 | * safe) | |
470 | * @old: old value | |
471 | * @div: divisor | |
472 | * @mult: multiplier | |
473 | * | |
474 | * | |
475 | * new = old * mult / div | |
476 | */ | |
477 | static inline unsigned long cpufreq_scale(unsigned long old, u_int div, | |
478 | u_int mult) | |
3d737108 | 479 | { |
74aca95d VK |
480 | #if BITS_PER_LONG == 32 |
481 | u64 result = ((u64) old) * ((u64) mult); | |
482 | do_div(result, div); | |
483 | return (unsigned long) result; | |
484 | ||
485 | #elif BITS_PER_LONG == 64 | |
486 | unsigned long result = old * ((u64) mult); | |
487 | result /= div; | |
488 | return result; | |
95235ca2 | 489 | #endif |
74aca95d | 490 | } |
95235ca2 | 491 | |
1da177e4 | 492 | /********************************************************************* |
74aca95d | 493 | * CPUFREQ GOVERNORS * |
1da177e4 LT |
494 | *********************************************************************/ |
495 | ||
74aca95d VK |
496 | /* |
497 | * If (cpufreq_driver->target) exists, the ->governor decides what frequency | |
498 | * within the limits is used. If (cpufreq_driver->setpolicy> exists, these | |
499 | * two generic policies are available: | |
500 | */ | |
501 | #define CPUFREQ_POLICY_POWERSAVE (1) | |
502 | #define CPUFREQ_POLICY_PERFORMANCE (2) | |
503 | ||
379480d8 RW |
504 | /* |
505 | * The polling frequency depends on the capability of the processor. Default | |
506 | * polling frequency is 1000 times the transition latency of the processor. The | |
507 | * ondemand governor will work on any processor with transition latency <= 10ms, | |
508 | * using appropriate sampling rate. | |
379480d8 | 509 | */ |
379480d8 | 510 | #define LATENCY_MULTIPLIER (1000) |
379480d8 | 511 | |
74aca95d VK |
512 | struct cpufreq_governor { |
513 | char name[CPUFREQ_NAME_LEN]; | |
e788892b RW |
514 | int (*init)(struct cpufreq_policy *policy); |
515 | void (*exit)(struct cpufreq_policy *policy); | |
516 | int (*start)(struct cpufreq_policy *policy); | |
517 | void (*stop)(struct cpufreq_policy *policy); | |
518 | void (*limits)(struct cpufreq_policy *policy); | |
74aca95d VK |
519 | ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
520 | char *buf); | |
521 | int (*store_setspeed) (struct cpufreq_policy *policy, | |
522 | unsigned int freq); | |
ed4676e2 VK |
523 | /* For governors which change frequency dynamically by themselves */ |
524 | bool dynamic_switching; | |
74aca95d VK |
525 | struct list_head governor_list; |
526 | struct module *owner; | |
527 | }; | |
528 | ||
529 | /* Pass a target to the cpufreq driver */ | |
b7898fda RW |
530 | unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, |
531 | unsigned int target_freq); | |
74aca95d VK |
532 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
533 | unsigned int target_freq, | |
534 | unsigned int relation); | |
535 | int __cpufreq_driver_target(struct cpufreq_policy *policy, | |
536 | unsigned int target_freq, | |
537 | unsigned int relation); | |
e3c06236 SM |
538 | unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, |
539 | unsigned int target_freq); | |
aa7519af | 540 | unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy); |
74aca95d VK |
541 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
542 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | |
543 | ||
de1df26b RW |
544 | struct cpufreq_governor *cpufreq_default_governor(void); |
545 | struct cpufreq_governor *cpufreq_fallback_governor(void); | |
1da177e4 | 546 | |
bf2be2de VK |
547 | static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) |
548 | { | |
549 | if (policy->max < policy->cur) | |
550 | __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); | |
551 | else if (policy->min > policy->cur) | |
552 | __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); | |
553 | } | |
554 | ||
66893b6a RW |
555 | /* Governor attribute set */ |
556 | struct gov_attr_set { | |
557 | struct kobject kobj; | |
558 | struct list_head policy_list; | |
559 | struct mutex update_lock; | |
560 | int usage_count; | |
561 | }; | |
562 | ||
563 | /* sysfs ops for cpufreq governors */ | |
564 | extern const struct sysfs_ops governor_sysfs_ops; | |
565 | ||
566 | void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); | |
567 | void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); | |
568 | unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); | |
569 | ||
570 | /* Governor sysfs attribute */ | |
571 | struct governor_attr { | |
572 | struct attribute attr; | |
573 | ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); | |
574 | ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, | |
575 | size_t count); | |
576 | }; | |
577 | ||
03639978 | 578 | static inline bool cpufreq_this_cpu_can_update(struct cpufreq_policy *policy) |
674e7541 | 579 | { |
99d14d0e VK |
580 | /* |
581 | * Allow remote callbacks if: | |
582 | * - dvfs_possible_from_any_cpu flag is set | |
583 | * - the local and remote CPUs share cpufreq policy | |
584 | */ | |
d6344d4b RW |
585 | return policy->dvfs_possible_from_any_cpu || |
586 | cpumask_test_cpu(smp_processor_id(), policy->cpus); | |
674e7541 VK |
587 | } |
588 | ||
1da177e4 LT |
589 | /********************************************************************* |
590 | * FREQUENCY TABLE HELPERS * | |
591 | *********************************************************************/ | |
592 | ||
7f4b0461 | 593 | /* Special Values of .frequency field */ |
2b1987a9 BH |
594 | #define CPUFREQ_ENTRY_INVALID ~0u |
595 | #define CPUFREQ_TABLE_END ~1u | |
7f4b0461 VK |
596 | /* Special Values of .flags field */ |
597 | #define CPUFREQ_BOOST_FREQ (1 << 0) | |
1da177e4 LT |
598 | |
599 | struct cpufreq_frequency_table { | |
7f4b0461 | 600 | unsigned int flags; |
50701588 | 601 | unsigned int driver_data; /* driver specific data, not used by core */ |
1da177e4 LT |
602 | unsigned int frequency; /* kHz - doesn't need to be in ascending |
603 | * order */ | |
604 | }; | |
605 | ||
a0dd7b79 NM |
606 | #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) |
607 | int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
608 | struct cpufreq_frequency_table **table); | |
609 | void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
610 | struct cpufreq_frequency_table **table); | |
611 | #else | |
612 | static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, | |
613 | struct cpufreq_frequency_table | |
614 | **table) | |
615 | { | |
616 | return -EINVAL; | |
617 | } | |
618 | ||
619 | static inline void dev_pm_opp_free_cpufreq_table(struct device *dev, | |
620 | struct cpufreq_frequency_table | |
621 | **table) | |
622 | { | |
623 | } | |
624 | #endif | |
625 | ||
27e289dc SK |
626 | /* |
627 | * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table | |
628 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
629 | * @table: the cpufreq_frequency_table * to iterate over. | |
630 | */ | |
631 | ||
632 | #define cpufreq_for_each_entry(pos, table) \ | |
633 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) | |
634 | ||
ffd81dcf DB |
635 | /* |
636 | * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table | |
637 | * with index | |
638 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
639 | * @table: the cpufreq_frequency_table * to iterate over. | |
640 | * @idx: the table entry currently being processed | |
641 | */ | |
642 | ||
643 | #define cpufreq_for_each_entry_idx(pos, table, idx) \ | |
644 | for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \ | |
645 | pos++, idx++) | |
646 | ||
27e289dc SK |
647 | /* |
648 | * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table | |
649 | * excluding CPUFREQ_ENTRY_INVALID frequencies. | |
650 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
651 | * @table: the cpufreq_frequency_table * to iterate over. | |
652 | */ | |
653 | ||
34b08705 RW |
654 | #define cpufreq_for_each_valid_entry(pos, table) \ |
655 | for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ | |
656 | if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ | |
657 | continue; \ | |
658 | else | |
27e289dc | 659 | |
ffd81dcf DB |
660 | /* |
661 | * cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq | |
662 | * frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies. | |
663 | * @pos: the cpufreq_frequency_table * to use as a loop cursor. | |
664 | * @table: the cpufreq_frequency_table * to iterate over. | |
665 | * @idx: the table entry currently being processed | |
666 | */ | |
667 | ||
668 | #define cpufreq_for_each_valid_entry_idx(pos, table, idx) \ | |
669 | cpufreq_for_each_entry_idx(pos, table, idx) \ | |
670 | if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ | |
671 | continue; \ | |
672 | else | |
673 | ||
674 | ||
1da177e4 LT |
675 | int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
676 | struct cpufreq_frequency_table *table); | |
677 | ||
678 | int cpufreq_frequency_table_verify(struct cpufreq_policy *policy, | |
679 | struct cpufreq_frequency_table *table); | |
18434512 | 680 | int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy); |
1da177e4 | 681 | |
da0c6dc0 VK |
682 | int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, |
683 | unsigned int target_freq, | |
684 | unsigned int relation); | |
d3916691 VK |
685 | int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
686 | unsigned int freq); | |
1da177e4 | 687 | |
74aca95d VK |
688 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
689 | ||
6f19efc0 LM |
690 | #ifdef CONFIG_CPU_FREQ |
691 | int cpufreq_boost_trigger_state(int state); | |
6f19efc0 | 692 | int cpufreq_boost_enabled(void); |
44139ed4 VK |
693 | int cpufreq_enable_boost_support(void); |
694 | bool policy_has_boost_freq(struct cpufreq_policy *policy); | |
da0c6dc0 VK |
695 | |
696 | /* Find lowest freq at or above target in a table in ascending order */ | |
697 | static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, | |
698 | unsigned int target_freq) | |
699 | { | |
700 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 701 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 702 | unsigned int freq; |
ffd81dcf | 703 | int idx, best = -1; |
da0c6dc0 | 704 | |
ffd81dcf | 705 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 706 | freq = pos->frequency; |
da0c6dc0 VK |
707 | |
708 | if (freq >= target_freq) | |
ffd81dcf | 709 | return idx; |
da0c6dc0 | 710 | |
ffd81dcf | 711 | best = idx; |
da0c6dc0 VK |
712 | } |
713 | ||
ffd81dcf | 714 | return best; |
da0c6dc0 VK |
715 | } |
716 | ||
717 | /* Find lowest freq at or above target in a table in descending order */ | |
718 | static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, | |
719 | unsigned int target_freq) | |
720 | { | |
721 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 722 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 723 | unsigned int freq; |
ffd81dcf | 724 | int idx, best = -1; |
da0c6dc0 | 725 | |
ffd81dcf | 726 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 727 | freq = pos->frequency; |
da0c6dc0 VK |
728 | |
729 | if (freq == target_freq) | |
ffd81dcf | 730 | return idx; |
da0c6dc0 VK |
731 | |
732 | if (freq > target_freq) { | |
ffd81dcf | 733 | best = idx; |
da0c6dc0 VK |
734 | continue; |
735 | } | |
736 | ||
737 | /* No freq found above target_freq */ | |
ffd81dcf DB |
738 | if (best == -1) |
739 | return idx; | |
da0c6dc0 | 740 | |
ffd81dcf | 741 | return best; |
da0c6dc0 VK |
742 | } |
743 | ||
ffd81dcf | 744 | return best; |
da0c6dc0 VK |
745 | } |
746 | ||
747 | /* Works only on sorted freq-tables */ | |
748 | static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, | |
749 | unsigned int target_freq) | |
750 | { | |
751 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
752 | ||
753 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
754 | return cpufreq_table_find_index_al(policy, target_freq); | |
755 | else | |
756 | return cpufreq_table_find_index_dl(policy, target_freq); | |
757 | } | |
758 | ||
759 | /* Find highest freq at or below target in a table in ascending order */ | |
760 | static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, | |
761 | unsigned int target_freq) | |
762 | { | |
763 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 764 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 765 | unsigned int freq; |
ffd81dcf | 766 | int idx, best = -1; |
da0c6dc0 | 767 | |
ffd81dcf | 768 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 769 | freq = pos->frequency; |
da0c6dc0 VK |
770 | |
771 | if (freq == target_freq) | |
ffd81dcf | 772 | return idx; |
da0c6dc0 VK |
773 | |
774 | if (freq < target_freq) { | |
ffd81dcf | 775 | best = idx; |
da0c6dc0 VK |
776 | continue; |
777 | } | |
778 | ||
779 | /* No freq found below target_freq */ | |
ffd81dcf DB |
780 | if (best == -1) |
781 | return idx; | |
da0c6dc0 | 782 | |
ffd81dcf | 783 | return best; |
da0c6dc0 VK |
784 | } |
785 | ||
ffd81dcf | 786 | return best; |
da0c6dc0 VK |
787 | } |
788 | ||
789 | /* Find highest freq at or below target in a table in descending order */ | |
790 | static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, | |
791 | unsigned int target_freq) | |
792 | { | |
793 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 794 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 795 | unsigned int freq; |
ffd81dcf | 796 | int idx, best = -1; |
da0c6dc0 | 797 | |
ffd81dcf | 798 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 799 | freq = pos->frequency; |
da0c6dc0 VK |
800 | |
801 | if (freq <= target_freq) | |
ffd81dcf | 802 | return idx; |
da0c6dc0 | 803 | |
ffd81dcf | 804 | best = idx; |
da0c6dc0 VK |
805 | } |
806 | ||
ffd81dcf | 807 | return best; |
da0c6dc0 VK |
808 | } |
809 | ||
810 | /* Works only on sorted freq-tables */ | |
811 | static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, | |
812 | unsigned int target_freq) | |
813 | { | |
814 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
815 | ||
816 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
817 | return cpufreq_table_find_index_ah(policy, target_freq); | |
818 | else | |
819 | return cpufreq_table_find_index_dh(policy, target_freq); | |
820 | } | |
821 | ||
822 | /* Find closest freq to target in a table in ascending order */ | |
823 | static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, | |
824 | unsigned int target_freq) | |
825 | { | |
826 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 827 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 828 | unsigned int freq; |
ffd81dcf | 829 | int idx, best = -1; |
da0c6dc0 | 830 | |
ffd81dcf | 831 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 832 | freq = pos->frequency; |
da0c6dc0 VK |
833 | |
834 | if (freq == target_freq) | |
ffd81dcf | 835 | return idx; |
da0c6dc0 VK |
836 | |
837 | if (freq < target_freq) { | |
ffd81dcf | 838 | best = idx; |
da0c6dc0 VK |
839 | continue; |
840 | } | |
841 | ||
842 | /* No freq found below target_freq */ | |
ffd81dcf DB |
843 | if (best == -1) |
844 | return idx; | |
da0c6dc0 VK |
845 | |
846 | /* Choose the closest freq */ | |
ffd81dcf DB |
847 | if (target_freq - table[best].frequency > freq - target_freq) |
848 | return idx; | |
da0c6dc0 | 849 | |
ffd81dcf | 850 | return best; |
da0c6dc0 VK |
851 | } |
852 | ||
ffd81dcf | 853 | return best; |
da0c6dc0 VK |
854 | } |
855 | ||
856 | /* Find closest freq to target in a table in descending order */ | |
857 | static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, | |
858 | unsigned int target_freq) | |
859 | { | |
860 | struct cpufreq_frequency_table *table = policy->freq_table; | |
ffd81dcf | 861 | struct cpufreq_frequency_table *pos; |
da0c6dc0 | 862 | unsigned int freq; |
ffd81dcf | 863 | int idx, best = -1; |
da0c6dc0 | 864 | |
ffd81dcf | 865 | cpufreq_for_each_valid_entry_idx(pos, table, idx) { |
899bb664 | 866 | freq = pos->frequency; |
da0c6dc0 VK |
867 | |
868 | if (freq == target_freq) | |
ffd81dcf | 869 | return idx; |
da0c6dc0 VK |
870 | |
871 | if (freq > target_freq) { | |
ffd81dcf | 872 | best = idx; |
da0c6dc0 VK |
873 | continue; |
874 | } | |
875 | ||
876 | /* No freq found above target_freq */ | |
ffd81dcf DB |
877 | if (best == -1) |
878 | return idx; | |
da0c6dc0 VK |
879 | |
880 | /* Choose the closest freq */ | |
ffd81dcf DB |
881 | if (table[best].frequency - target_freq > target_freq - freq) |
882 | return idx; | |
da0c6dc0 | 883 | |
ffd81dcf | 884 | return best; |
da0c6dc0 VK |
885 | } |
886 | ||
ffd81dcf | 887 | return best; |
da0c6dc0 VK |
888 | } |
889 | ||
890 | /* Works only on sorted freq-tables */ | |
891 | static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, | |
892 | unsigned int target_freq) | |
893 | { | |
894 | target_freq = clamp_val(target_freq, policy->min, policy->max); | |
895 | ||
896 | if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) | |
897 | return cpufreq_table_find_index_ac(policy, target_freq); | |
898 | else | |
899 | return cpufreq_table_find_index_dc(policy, target_freq); | |
900 | } | |
901 | ||
902 | static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, | |
903 | unsigned int target_freq, | |
904 | unsigned int relation) | |
905 | { | |
906 | if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) | |
907 | return cpufreq_table_index_unsorted(policy, target_freq, | |
908 | relation); | |
909 | ||
910 | switch (relation) { | |
911 | case CPUFREQ_RELATION_L: | |
912 | return cpufreq_table_find_index_l(policy, target_freq); | |
913 | case CPUFREQ_RELATION_H: | |
914 | return cpufreq_table_find_index_h(policy, target_freq); | |
915 | case CPUFREQ_RELATION_C: | |
916 | return cpufreq_table_find_index_c(policy, target_freq); | |
917 | default: | |
918 | pr_err("%s: Invalid relation: %d\n", __func__, relation); | |
919 | return -EINVAL; | |
920 | } | |
921 | } | |
55d85293 VK |
922 | |
923 | static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy) | |
924 | { | |
925 | struct cpufreq_frequency_table *pos; | |
926 | int count = 0; | |
927 | ||
928 | if (unlikely(!policy->freq_table)) | |
929 | return 0; | |
930 | ||
931 | cpufreq_for_each_valid_entry(pos, policy->freq_table) | |
932 | count++; | |
933 | ||
934 | return count; | |
935 | } | |
6f19efc0 LM |
936 | #else |
937 | static inline int cpufreq_boost_trigger_state(int state) | |
938 | { | |
939 | return 0; | |
940 | } | |
6f19efc0 LM |
941 | static inline int cpufreq_boost_enabled(void) |
942 | { | |
943 | return 0; | |
944 | } | |
44139ed4 VK |
945 | |
946 | static inline int cpufreq_enable_boost_support(void) | |
947 | { | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
951 | static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) | |
952 | { | |
953 | return false; | |
954 | } | |
6f19efc0 | 955 | #endif |
1da177e4 | 956 | |
531b5c9f QP |
957 | #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) |
958 | void sched_cpufreq_governor_change(struct cpufreq_policy *policy, | |
959 | struct cpufreq_governor *old_gov); | |
960 | #else | |
961 | static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy, | |
962 | struct cpufreq_governor *old_gov) { } | |
963 | #endif | |
964 | ||
7d5905dc | 965 | extern void arch_freq_prepare_all(void); |
f8475cef LB |
966 | extern unsigned int arch_freq_get_on_cpu(int cpu); |
967 | ||
e7d5459d DE |
968 | extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq, |
969 | unsigned long max_freq); | |
970 | ||
1da177e4 LT |
971 | /* the following are really really optional */ |
972 | extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; | |
21c36d35 | 973 | extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; |
18434512 | 974 | extern struct freq_attr *cpufreq_generic_attr[]; |
d417e069 | 975 | int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy); |
f4fd3797 | 976 | |
652ed95d | 977 | unsigned int cpufreq_generic_get(unsigned int cpu); |
70e9e778 VK |
978 | int cpufreq_generic_init(struct cpufreq_policy *policy, |
979 | struct cpufreq_frequency_table *table, | |
980 | unsigned int transition_latency); | |
1da177e4 | 981 | #endif /* _LINUX_CPUFREQ_H */ |