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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/cpufreq/cpufreq.c | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
bb176f7d | 6 | * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org> |
1da177e4 | 7 | * |
c32b6b8e | 8 | * Oct 2005 - Ashok Raj <ashok.raj@intel.com> |
32ee8c3e | 9 | * Added handling for CPU hotplug |
8ff69732 DJ |
10 | * Feb 2006 - Jacob Shin <jacob.shin@amd.com> |
11 | * Fix handling for CPU hotplug -- affected CPUs | |
c32b6b8e | 12 | * |
1da177e4 LT |
13 | * This program is free software; you can redistribute it and/or modify |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
1da177e4 LT |
16 | */ |
17 | ||
db701151 VK |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
5ff0a268 | 20 | #include <linux/cpu.h> |
1da177e4 LT |
21 | #include <linux/cpufreq.h> |
22 | #include <linux/delay.h> | |
1da177e4 | 23 | #include <linux/device.h> |
5ff0a268 VK |
24 | #include <linux/init.h> |
25 | #include <linux/kernel_stat.h> | |
26 | #include <linux/module.h> | |
3fc54d37 | 27 | #include <linux/mutex.h> |
5ff0a268 | 28 | #include <linux/slab.h> |
2f0aea93 | 29 | #include <linux/suspend.h> |
90de2a4a | 30 | #include <linux/syscore_ops.h> |
5ff0a268 | 31 | #include <linux/tick.h> |
6f4f2723 TR |
32 | #include <trace/events/power.h> |
33 | ||
b4f0676f | 34 | static LIST_HEAD(cpufreq_policy_list); |
f963735a VK |
35 | |
36 | static inline bool policy_is_inactive(struct cpufreq_policy *policy) | |
37 | { | |
38 | return cpumask_empty(policy->cpus); | |
39 | } | |
40 | ||
41 | static bool suitable_policy(struct cpufreq_policy *policy, bool active) | |
42 | { | |
43 | return active == !policy_is_inactive(policy); | |
44 | } | |
45 | ||
46 | /* Finds Next Acive/Inactive policy */ | |
47 | static struct cpufreq_policy *next_policy(struct cpufreq_policy *policy, | |
48 | bool active) | |
49 | { | |
50 | do { | |
51 | policy = list_next_entry(policy, policy_list); | |
52 | ||
53 | /* No more policies in the list */ | |
54 | if (&policy->policy_list == &cpufreq_policy_list) | |
55 | return NULL; | |
56 | } while (!suitable_policy(policy, active)); | |
57 | ||
58 | return policy; | |
59 | } | |
60 | ||
61 | static struct cpufreq_policy *first_policy(bool active) | |
62 | { | |
63 | struct cpufreq_policy *policy; | |
64 | ||
65 | /* No policies in the list */ | |
66 | if (list_empty(&cpufreq_policy_list)) | |
67 | return NULL; | |
68 | ||
69 | policy = list_first_entry(&cpufreq_policy_list, typeof(*policy), | |
70 | policy_list); | |
71 | ||
72 | if (!suitable_policy(policy, active)) | |
73 | policy = next_policy(policy, active); | |
74 | ||
75 | return policy; | |
76 | } | |
77 | ||
78 | /* Macros to iterate over CPU policies */ | |
79 | #define for_each_suitable_policy(__policy, __active) \ | |
80 | for (__policy = first_policy(__active); \ | |
81 | __policy; \ | |
82 | __policy = next_policy(__policy, __active)) | |
83 | ||
84 | #define for_each_active_policy(__policy) \ | |
85 | for_each_suitable_policy(__policy, true) | |
86 | #define for_each_inactive_policy(__policy) \ | |
87 | for_each_suitable_policy(__policy, false) | |
88 | ||
89 | #define for_each_policy(__policy) \ | |
b4f0676f VK |
90 | list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) |
91 | ||
f7b27061 VK |
92 | /* Iterate over governors */ |
93 | static LIST_HEAD(cpufreq_governor_list); | |
94 | #define for_each_governor(__governor) \ | |
95 | list_for_each_entry(__governor, &cpufreq_governor_list, governor_list) | |
96 | ||
1da177e4 | 97 | /** |
cd878479 | 98 | * The "cpufreq driver" - the arch- or hardware-dependent low |
1da177e4 LT |
99 | * level driver of CPUFreq support, and its spinlock. This lock |
100 | * also protects the cpufreq_cpu_data array. | |
101 | */ | |
1c3d85dd | 102 | static struct cpufreq_driver *cpufreq_driver; |
7a6aedfa | 103 | static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); |
bb176f7d | 104 | static DEFINE_RWLOCK(cpufreq_driver_lock); |
6f1e4efd | 105 | DEFINE_MUTEX(cpufreq_governor_lock); |
bb176f7d | 106 | |
2f0aea93 VK |
107 | /* Flag to suspend/resume CPUFreq governors */ |
108 | static bool cpufreq_suspended; | |
1da177e4 | 109 | |
9c0ebcf7 VK |
110 | static inline bool has_target(void) |
111 | { | |
112 | return cpufreq_driver->target_index || cpufreq_driver->target; | |
113 | } | |
114 | ||
1da177e4 | 115 | /* internal prototypes */ |
29464f28 DJ |
116 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
117 | unsigned int event); | |
d92d50a4 | 118 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
65f27f38 | 119 | static void handle_update(struct work_struct *work); |
1da177e4 LT |
120 | |
121 | /** | |
32ee8c3e DJ |
122 | * Two notifier lists: the "policy" list is involved in the |
123 | * validation process for a new CPU frequency policy; the | |
1da177e4 LT |
124 | * "transition" list for kernel code that needs to handle |
125 | * changes to devices when the CPU clock speed changes. | |
126 | * The mutex locks both lists. | |
127 | */ | |
e041c683 | 128 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
b4dfdbb3 | 129 | static struct srcu_notifier_head cpufreq_transition_notifier_list; |
1da177e4 | 130 | |
74212ca4 | 131 | static bool init_cpufreq_transition_notifier_list_called; |
b4dfdbb3 AS |
132 | static int __init init_cpufreq_transition_notifier_list(void) |
133 | { | |
134 | srcu_init_notifier_head(&cpufreq_transition_notifier_list); | |
74212ca4 | 135 | init_cpufreq_transition_notifier_list_called = true; |
b4dfdbb3 AS |
136 | return 0; |
137 | } | |
b3438f82 | 138 | pure_initcall(init_cpufreq_transition_notifier_list); |
1da177e4 | 139 | |
a7b422cd | 140 | static int off __read_mostly; |
da584455 | 141 | static int cpufreq_disabled(void) |
a7b422cd KRW |
142 | { |
143 | return off; | |
144 | } | |
145 | void disable_cpufreq(void) | |
146 | { | |
147 | off = 1; | |
148 | } | |
29464f28 | 149 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
1da177e4 | 150 | |
4d5dcc42 VK |
151 | bool have_governor_per_policy(void) |
152 | { | |
0b981e70 | 153 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
4d5dcc42 | 154 | } |
3f869d6d | 155 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
4d5dcc42 | 156 | |
944e9a03 VK |
157 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
158 | { | |
159 | if (have_governor_per_policy()) | |
160 | return &policy->kobj; | |
161 | else | |
162 | return cpufreq_global_kobject; | |
163 | } | |
164 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); | |
165 | ||
5a31d594 VK |
166 | struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu) |
167 | { | |
168 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); | |
169 | ||
170 | return policy && !policy_is_inactive(policy) ? | |
171 | policy->freq_table : NULL; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table); | |
174 | ||
72a4ce34 VK |
175 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
176 | { | |
177 | u64 idle_time; | |
178 | u64 cur_wall_time; | |
179 | u64 busy_time; | |
180 | ||
181 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); | |
182 | ||
183 | busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; | |
184 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; | |
185 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; | |
186 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; | |
187 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; | |
188 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; | |
189 | ||
190 | idle_time = cur_wall_time - busy_time; | |
191 | if (wall) | |
192 | *wall = cputime_to_usecs(cur_wall_time); | |
193 | ||
194 | return cputime_to_usecs(idle_time); | |
195 | } | |
196 | ||
197 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) | |
198 | { | |
199 | u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); | |
200 | ||
201 | if (idle_time == -1ULL) | |
202 | return get_cpu_idle_time_jiffy(cpu, wall); | |
203 | else if (!io_busy) | |
204 | idle_time += get_cpu_iowait_time_us(cpu, wall); | |
205 | ||
206 | return idle_time; | |
207 | } | |
208 | EXPORT_SYMBOL_GPL(get_cpu_idle_time); | |
209 | ||
70e9e778 VK |
210 | /* |
211 | * This is a generic cpufreq init() routine which can be used by cpufreq | |
212 | * drivers of SMP systems. It will do following: | |
213 | * - validate & show freq table passed | |
214 | * - set policies transition latency | |
215 | * - policy->cpus with all possible CPUs | |
216 | */ | |
217 | int cpufreq_generic_init(struct cpufreq_policy *policy, | |
218 | struct cpufreq_frequency_table *table, | |
219 | unsigned int transition_latency) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | ret = cpufreq_table_validate_and_show(policy, table); | |
224 | if (ret) { | |
225 | pr_err("%s: invalid frequency table: %d\n", __func__, ret); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | policy->cpuinfo.transition_latency = transition_latency; | |
230 | ||
231 | /* | |
58405af6 | 232 | * The driver only supports the SMP configuration where all processors |
70e9e778 VK |
233 | * share the clock and voltage and clock. |
234 | */ | |
235 | cpumask_setall(policy->cpus); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | EXPORT_SYMBOL_GPL(cpufreq_generic_init); | |
240 | ||
988bed09 VK |
241 | /* Only for cpufreq core internal use */ |
242 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) | |
652ed95d VK |
243 | { |
244 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); | |
245 | ||
988bed09 VK |
246 | return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; |
247 | } | |
248 | ||
249 | unsigned int cpufreq_generic_get(unsigned int cpu) | |
250 | { | |
251 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); | |
252 | ||
652ed95d | 253 | if (!policy || IS_ERR(policy->clk)) { |
e837f9b5 JP |
254 | pr_err("%s: No %s associated to cpu: %d\n", |
255 | __func__, policy ? "clk" : "policy", cpu); | |
652ed95d VK |
256 | return 0; |
257 | } | |
258 | ||
259 | return clk_get_rate(policy->clk) / 1000; | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(cpufreq_generic_get); | |
262 | ||
50e9c852 VK |
263 | /** |
264 | * cpufreq_cpu_get: returns policy for a cpu and marks it busy. | |
265 | * | |
266 | * @cpu: cpu to find policy for. | |
267 | * | |
268 | * This returns policy for 'cpu', returns NULL if it doesn't exist. | |
269 | * It also increments the kobject reference count to mark it busy and so would | |
270 | * require a corresponding call to cpufreq_cpu_put() to decrement it back. | |
271 | * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be | |
272 | * freed as that depends on the kobj count. | |
273 | * | |
50e9c852 VK |
274 | * Return: A valid policy on success, otherwise NULL on failure. |
275 | */ | |
6eed9404 | 276 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
1da177e4 | 277 | { |
6eed9404 | 278 | struct cpufreq_policy *policy = NULL; |
1da177e4 LT |
279 | unsigned long flags; |
280 | ||
1b947c90 | 281 | if (WARN_ON(cpu >= nr_cpu_ids)) |
6eed9404 VK |
282 | return NULL; |
283 | ||
1da177e4 | 284 | /* get the cpufreq driver */ |
1c3d85dd | 285 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
1da177e4 | 286 | |
6eed9404 VK |
287 | if (cpufreq_driver) { |
288 | /* get the CPU */ | |
988bed09 | 289 | policy = cpufreq_cpu_get_raw(cpu); |
6eed9404 VK |
290 | if (policy) |
291 | kobject_get(&policy->kobj); | |
292 | } | |
1da177e4 | 293 | |
6eed9404 | 294 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 295 | |
3a3e9e06 | 296 | return policy; |
a9144436 | 297 | } |
1da177e4 LT |
298 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
299 | ||
50e9c852 VK |
300 | /** |
301 | * cpufreq_cpu_put: Decrements the usage count of a policy | |
302 | * | |
303 | * @policy: policy earlier returned by cpufreq_cpu_get(). | |
304 | * | |
305 | * This decrements the kobject reference count incremented earlier by calling | |
306 | * cpufreq_cpu_get(). | |
50e9c852 | 307 | */ |
3a3e9e06 | 308 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
1da177e4 | 309 | { |
6eed9404 | 310 | kobject_put(&policy->kobj); |
1da177e4 LT |
311 | } |
312 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); | |
313 | ||
1da177e4 LT |
314 | /********************************************************************* |
315 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * | |
316 | *********************************************************************/ | |
317 | ||
318 | /** | |
319 | * adjust_jiffies - adjust the system "loops_per_jiffy" | |
320 | * | |
321 | * This function alters the system "loops_per_jiffy" for the clock | |
322 | * speed change. Note that loops_per_jiffy cannot be updated on SMP | |
32ee8c3e | 323 | * systems as each CPU might be scaled differently. So, use the arch |
1da177e4 LT |
324 | * per-CPU loops_per_jiffy value wherever possible. |
325 | */ | |
858119e1 | 326 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
1da177e4 | 327 | { |
39c132ee VK |
328 | #ifndef CONFIG_SMP |
329 | static unsigned long l_p_j_ref; | |
330 | static unsigned int l_p_j_ref_freq; | |
331 | ||
1da177e4 LT |
332 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
333 | return; | |
334 | ||
335 | if (!l_p_j_ref_freq) { | |
336 | l_p_j_ref = loops_per_jiffy; | |
337 | l_p_j_ref_freq = ci->old; | |
e837f9b5 JP |
338 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
339 | l_p_j_ref, l_p_j_ref_freq); | |
1da177e4 | 340 | } |
0b443ead | 341 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
e08f5f5b GS |
342 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
343 | ci->new); | |
e837f9b5 JP |
344 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
345 | loops_per_jiffy, ci->new); | |
1da177e4 | 346 | } |
1da177e4 | 347 | #endif |
39c132ee | 348 | } |
1da177e4 | 349 | |
0956df9c | 350 | static void __cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb | 351 | struct cpufreq_freqs *freqs, unsigned int state) |
1da177e4 LT |
352 | { |
353 | BUG_ON(irqs_disabled()); | |
354 | ||
d5aaffa9 DB |
355 | if (cpufreq_disabled()) |
356 | return; | |
357 | ||
1c3d85dd | 358 | freqs->flags = cpufreq_driver->flags; |
2d06d8c4 | 359 | pr_debug("notification %u of frequency transition to %u kHz\n", |
e837f9b5 | 360 | state, freqs->new); |
1da177e4 | 361 | |
1da177e4 | 362 | switch (state) { |
e4472cb3 | 363 | |
1da177e4 | 364 | case CPUFREQ_PRECHANGE: |
32ee8c3e | 365 | /* detect if the driver reported a value as "old frequency" |
e4472cb3 DJ |
366 | * which is not equal to what the cpufreq core thinks is |
367 | * "old frequency". | |
1da177e4 | 368 | */ |
1c3d85dd | 369 | if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e4472cb3 DJ |
370 | if ((policy) && (policy->cpu == freqs->cpu) && |
371 | (policy->cur) && (policy->cur != freqs->old)) { | |
e837f9b5 JP |
372 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
373 | freqs->old, policy->cur); | |
e4472cb3 | 374 | freqs->old = policy->cur; |
1da177e4 LT |
375 | } |
376 | } | |
b4dfdbb3 | 377 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 378 | CPUFREQ_PRECHANGE, freqs); |
1da177e4 LT |
379 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
380 | break; | |
e4472cb3 | 381 | |
1da177e4 LT |
382 | case CPUFREQ_POSTCHANGE: |
383 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); | |
e837f9b5 JP |
384 | pr_debug("FREQ: %lu - CPU: %lu\n", |
385 | (unsigned long)freqs->new, (unsigned long)freqs->cpu); | |
25e41933 | 386 | trace_cpu_frequency(freqs->new, freqs->cpu); |
b4dfdbb3 | 387 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 388 | CPUFREQ_POSTCHANGE, freqs); |
e4472cb3 DJ |
389 | if (likely(policy) && likely(policy->cpu == freqs->cpu)) |
390 | policy->cur = freqs->new; | |
1da177e4 LT |
391 | break; |
392 | } | |
1da177e4 | 393 | } |
bb176f7d | 394 | |
b43a7ffb VK |
395 | /** |
396 | * cpufreq_notify_transition - call notifier chain and adjust_jiffies | |
397 | * on frequency transition. | |
398 | * | |
399 | * This function calls the transition notifiers and the "adjust_jiffies" | |
400 | * function. It is called twice on all CPU frequency changes that have | |
401 | * external effects. | |
402 | */ | |
236a9800 | 403 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb VK |
404 | struct cpufreq_freqs *freqs, unsigned int state) |
405 | { | |
406 | for_each_cpu(freqs->cpu, policy->cpus) | |
407 | __cpufreq_notify_transition(policy, freqs, state); | |
408 | } | |
1da177e4 | 409 | |
f7ba3b41 | 410 | /* Do post notifications when there are chances that transition has failed */ |
236a9800 | 411 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
f7ba3b41 VK |
412 | struct cpufreq_freqs *freqs, int transition_failed) |
413 | { | |
414 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
415 | if (!transition_failed) | |
416 | return; | |
417 | ||
418 | swap(freqs->old, freqs->new); | |
419 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
420 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
421 | } | |
f7ba3b41 | 422 | |
12478cf0 SB |
423 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
424 | struct cpufreq_freqs *freqs) | |
425 | { | |
ca654dc3 SB |
426 | |
427 | /* | |
428 | * Catch double invocations of _begin() which lead to self-deadlock. | |
429 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core | |
430 | * doesn't invoke _begin() on their behalf, and hence the chances of | |
431 | * double invocations are very low. Moreover, there are scenarios | |
432 | * where these checks can emit false-positive warnings in these | |
433 | * drivers; so we avoid that by skipping them altogether. | |
434 | */ | |
435 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) | |
436 | && current == policy->transition_task); | |
437 | ||
12478cf0 SB |
438 | wait: |
439 | wait_event(policy->transition_wait, !policy->transition_ongoing); | |
440 | ||
441 | spin_lock(&policy->transition_lock); | |
442 | ||
443 | if (unlikely(policy->transition_ongoing)) { | |
444 | spin_unlock(&policy->transition_lock); | |
445 | goto wait; | |
446 | } | |
447 | ||
448 | policy->transition_ongoing = true; | |
ca654dc3 | 449 | policy->transition_task = current; |
12478cf0 SB |
450 | |
451 | spin_unlock(&policy->transition_lock); | |
452 | ||
453 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); | |
456 | ||
457 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
458 | struct cpufreq_freqs *freqs, int transition_failed) | |
459 | { | |
460 | if (unlikely(WARN_ON(!policy->transition_ongoing))) | |
461 | return; | |
462 | ||
463 | cpufreq_notify_post_transition(policy, freqs, transition_failed); | |
464 | ||
465 | policy->transition_ongoing = false; | |
ca654dc3 | 466 | policy->transition_task = NULL; |
12478cf0 SB |
467 | |
468 | wake_up(&policy->transition_wait); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); | |
471 | ||
1da177e4 | 472 | |
1da177e4 LT |
473 | /********************************************************************* |
474 | * SYSFS INTERFACE * | |
475 | *********************************************************************/ | |
8a5c74a1 | 476 | static ssize_t show_boost(struct kobject *kobj, |
6f19efc0 LM |
477 | struct attribute *attr, char *buf) |
478 | { | |
479 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); | |
480 | } | |
481 | ||
482 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, | |
483 | const char *buf, size_t count) | |
484 | { | |
485 | int ret, enable; | |
486 | ||
487 | ret = sscanf(buf, "%d", &enable); | |
488 | if (ret != 1 || enable < 0 || enable > 1) | |
489 | return -EINVAL; | |
490 | ||
491 | if (cpufreq_boost_trigger_state(enable)) { | |
e837f9b5 JP |
492 | pr_err("%s: Cannot %s BOOST!\n", |
493 | __func__, enable ? "enable" : "disable"); | |
6f19efc0 LM |
494 | return -EINVAL; |
495 | } | |
496 | ||
e837f9b5 JP |
497 | pr_debug("%s: cpufreq BOOST %s\n", |
498 | __func__, enable ? "enabled" : "disabled"); | |
6f19efc0 LM |
499 | |
500 | return count; | |
501 | } | |
502 | define_one_global_rw(boost); | |
1da177e4 | 503 | |
42f91fa1 | 504 | static struct cpufreq_governor *find_governor(const char *str_governor) |
3bcb09a3 JF |
505 | { |
506 | struct cpufreq_governor *t; | |
507 | ||
f7b27061 | 508 | for_each_governor(t) |
7c4f4539 | 509 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
3bcb09a3 JF |
510 | return t; |
511 | ||
512 | return NULL; | |
513 | } | |
514 | ||
1da177e4 LT |
515 | /** |
516 | * cpufreq_parse_governor - parse a governor string | |
517 | */ | |
905d77cd | 518 | static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, |
1da177e4 LT |
519 | struct cpufreq_governor **governor) |
520 | { | |
3bcb09a3 | 521 | int err = -EINVAL; |
1c3d85dd RW |
522 | |
523 | if (!cpufreq_driver) | |
3bcb09a3 JF |
524 | goto out; |
525 | ||
1c3d85dd | 526 | if (cpufreq_driver->setpolicy) { |
7c4f4539 | 527 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { |
1da177e4 | 528 | *policy = CPUFREQ_POLICY_PERFORMANCE; |
3bcb09a3 | 529 | err = 0; |
7c4f4539 | 530 | } else if (!strncasecmp(str_governor, "powersave", |
e08f5f5b | 531 | CPUFREQ_NAME_LEN)) { |
1da177e4 | 532 | *policy = CPUFREQ_POLICY_POWERSAVE; |
3bcb09a3 | 533 | err = 0; |
1da177e4 | 534 | } |
2e1cc3a5 | 535 | } else { |
1da177e4 | 536 | struct cpufreq_governor *t; |
3bcb09a3 | 537 | |
3fc54d37 | 538 | mutex_lock(&cpufreq_governor_mutex); |
3bcb09a3 | 539 | |
42f91fa1 | 540 | t = find_governor(str_governor); |
3bcb09a3 | 541 | |
ea714970 | 542 | if (t == NULL) { |
1a8e1463 | 543 | int ret; |
ea714970 | 544 | |
1a8e1463 KC |
545 | mutex_unlock(&cpufreq_governor_mutex); |
546 | ret = request_module("cpufreq_%s", str_governor); | |
547 | mutex_lock(&cpufreq_governor_mutex); | |
ea714970 | 548 | |
1a8e1463 | 549 | if (ret == 0) |
42f91fa1 | 550 | t = find_governor(str_governor); |
ea714970 JF |
551 | } |
552 | ||
3bcb09a3 JF |
553 | if (t != NULL) { |
554 | *governor = t; | |
555 | err = 0; | |
1da177e4 | 556 | } |
3bcb09a3 | 557 | |
3fc54d37 | 558 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 | 559 | } |
29464f28 | 560 | out: |
3bcb09a3 | 561 | return err; |
1da177e4 | 562 | } |
1da177e4 | 563 | |
1da177e4 | 564 | /** |
e08f5f5b GS |
565 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
566 | * print out cpufreq information | |
1da177e4 LT |
567 | * |
568 | * Write out information from cpufreq_driver->policy[cpu]; object must be | |
569 | * "unsigned int". | |
570 | */ | |
571 | ||
32ee8c3e DJ |
572 | #define show_one(file_name, object) \ |
573 | static ssize_t show_##file_name \ | |
905d77cd | 574 | (struct cpufreq_policy *policy, char *buf) \ |
32ee8c3e | 575 | { \ |
29464f28 | 576 | return sprintf(buf, "%u\n", policy->object); \ |
1da177e4 LT |
577 | } |
578 | ||
579 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); | |
580 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); | |
ed129784 | 581 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
1da177e4 LT |
582 | show_one(scaling_min_freq, min); |
583 | show_one(scaling_max_freq, max); | |
c034b02e | 584 | |
09347b29 | 585 | static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
c034b02e DB |
586 | { |
587 | ssize_t ret; | |
588 | ||
589 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) | |
590 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); | |
591 | else | |
592 | ret = sprintf(buf, "%u\n", policy->cur); | |
593 | return ret; | |
594 | } | |
1da177e4 | 595 | |
037ce839 | 596 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 597 | struct cpufreq_policy *new_policy); |
7970e08b | 598 | |
1da177e4 LT |
599 | /** |
600 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access | |
601 | */ | |
602 | #define store_one(file_name, object) \ | |
603 | static ssize_t store_##file_name \ | |
905d77cd | 604 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
1da177e4 | 605 | { \ |
619c144c | 606 | int ret, temp; \ |
1da177e4 LT |
607 | struct cpufreq_policy new_policy; \ |
608 | \ | |
609 | ret = cpufreq_get_policy(&new_policy, policy->cpu); \ | |
610 | if (ret) \ | |
611 | return -EINVAL; \ | |
612 | \ | |
29464f28 | 613 | ret = sscanf(buf, "%u", &new_policy.object); \ |
1da177e4 LT |
614 | if (ret != 1) \ |
615 | return -EINVAL; \ | |
616 | \ | |
619c144c | 617 | temp = new_policy.object; \ |
037ce839 | 618 | ret = cpufreq_set_policy(policy, &new_policy); \ |
619c144c VH |
619 | if (!ret) \ |
620 | policy->user_policy.object = temp; \ | |
1da177e4 LT |
621 | \ |
622 | return ret ? ret : count; \ | |
623 | } | |
624 | ||
29464f28 DJ |
625 | store_one(scaling_min_freq, min); |
626 | store_one(scaling_max_freq, max); | |
1da177e4 LT |
627 | |
628 | /** | |
629 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware | |
630 | */ | |
905d77cd DJ |
631 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
632 | char *buf) | |
1da177e4 | 633 | { |
d92d50a4 | 634 | unsigned int cur_freq = __cpufreq_get(policy); |
1da177e4 LT |
635 | if (!cur_freq) |
636 | return sprintf(buf, "<unknown>"); | |
637 | return sprintf(buf, "%u\n", cur_freq); | |
638 | } | |
639 | ||
1da177e4 LT |
640 | /** |
641 | * show_scaling_governor - show the current policy for the specified CPU | |
642 | */ | |
905d77cd | 643 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 644 | { |
29464f28 | 645 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
1da177e4 LT |
646 | return sprintf(buf, "powersave\n"); |
647 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) | |
648 | return sprintf(buf, "performance\n"); | |
649 | else if (policy->governor) | |
4b972f0b | 650 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
29464f28 | 651 | policy->governor->name); |
1da177e4 LT |
652 | return -EINVAL; |
653 | } | |
654 | ||
1da177e4 LT |
655 | /** |
656 | * store_scaling_governor - store policy for the specified CPU | |
657 | */ | |
905d77cd DJ |
658 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
659 | const char *buf, size_t count) | |
1da177e4 | 660 | { |
5136fa56 | 661 | int ret; |
1da177e4 LT |
662 | char str_governor[16]; |
663 | struct cpufreq_policy new_policy; | |
664 | ||
665 | ret = cpufreq_get_policy(&new_policy, policy->cpu); | |
666 | if (ret) | |
667 | return ret; | |
668 | ||
29464f28 | 669 | ret = sscanf(buf, "%15s", str_governor); |
1da177e4 LT |
670 | if (ret != 1) |
671 | return -EINVAL; | |
672 | ||
e08f5f5b GS |
673 | if (cpufreq_parse_governor(str_governor, &new_policy.policy, |
674 | &new_policy.governor)) | |
1da177e4 LT |
675 | return -EINVAL; |
676 | ||
037ce839 | 677 | ret = cpufreq_set_policy(policy, &new_policy); |
7970e08b TR |
678 | |
679 | policy->user_policy.policy = policy->policy; | |
680 | policy->user_policy.governor = policy->governor; | |
7970e08b | 681 | |
e08f5f5b GS |
682 | if (ret) |
683 | return ret; | |
684 | else | |
685 | return count; | |
1da177e4 LT |
686 | } |
687 | ||
688 | /** | |
689 | * show_scaling_driver - show the cpufreq driver currently loaded | |
690 | */ | |
905d77cd | 691 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 692 | { |
1c3d85dd | 693 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
1da177e4 LT |
694 | } |
695 | ||
696 | /** | |
697 | * show_scaling_available_governors - show the available CPUfreq governors | |
698 | */ | |
905d77cd DJ |
699 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
700 | char *buf) | |
1da177e4 LT |
701 | { |
702 | ssize_t i = 0; | |
703 | struct cpufreq_governor *t; | |
704 | ||
9c0ebcf7 | 705 | if (!has_target()) { |
1da177e4 LT |
706 | i += sprintf(buf, "performance powersave"); |
707 | goto out; | |
708 | } | |
709 | ||
f7b27061 | 710 | for_each_governor(t) { |
29464f28 DJ |
711 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
712 | - (CPUFREQ_NAME_LEN + 2))) | |
1da177e4 | 713 | goto out; |
4b972f0b | 714 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
1da177e4 | 715 | } |
7d5e350f | 716 | out: |
1da177e4 LT |
717 | i += sprintf(&buf[i], "\n"); |
718 | return i; | |
719 | } | |
e8628dd0 | 720 | |
f4fd3797 | 721 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
1da177e4 LT |
722 | { |
723 | ssize_t i = 0; | |
724 | unsigned int cpu; | |
725 | ||
835481d9 | 726 | for_each_cpu(cpu, mask) { |
1da177e4 LT |
727 | if (i) |
728 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); | |
729 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); | |
730 | if (i >= (PAGE_SIZE - 5)) | |
29464f28 | 731 | break; |
1da177e4 LT |
732 | } |
733 | i += sprintf(&buf[i], "\n"); | |
734 | return i; | |
735 | } | |
f4fd3797 | 736 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
1da177e4 | 737 | |
e8628dd0 DW |
738 | /** |
739 | * show_related_cpus - show the CPUs affected by each transition even if | |
740 | * hw coordination is in use | |
741 | */ | |
742 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) | |
743 | { | |
f4fd3797 | 744 | return cpufreq_show_cpus(policy->related_cpus, buf); |
e8628dd0 DW |
745 | } |
746 | ||
747 | /** | |
748 | * show_affected_cpus - show the CPUs affected by each transition | |
749 | */ | |
750 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) | |
751 | { | |
f4fd3797 | 752 | return cpufreq_show_cpus(policy->cpus, buf); |
e8628dd0 DW |
753 | } |
754 | ||
9e76988e | 755 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
905d77cd | 756 | const char *buf, size_t count) |
9e76988e VP |
757 | { |
758 | unsigned int freq = 0; | |
759 | unsigned int ret; | |
760 | ||
879000f9 | 761 | if (!policy->governor || !policy->governor->store_setspeed) |
9e76988e VP |
762 | return -EINVAL; |
763 | ||
764 | ret = sscanf(buf, "%u", &freq); | |
765 | if (ret != 1) | |
766 | return -EINVAL; | |
767 | ||
768 | policy->governor->store_setspeed(policy, freq); | |
769 | ||
770 | return count; | |
771 | } | |
772 | ||
773 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) | |
774 | { | |
879000f9 | 775 | if (!policy->governor || !policy->governor->show_setspeed) |
9e76988e VP |
776 | return sprintf(buf, "<unsupported>\n"); |
777 | ||
778 | return policy->governor->show_setspeed(policy, buf); | |
779 | } | |
1da177e4 | 780 | |
e2f74f35 | 781 | /** |
8bf1ac72 | 782 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
e2f74f35 TR |
783 | */ |
784 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) | |
785 | { | |
786 | unsigned int limit; | |
787 | int ret; | |
1c3d85dd RW |
788 | if (cpufreq_driver->bios_limit) { |
789 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); | |
e2f74f35 TR |
790 | if (!ret) |
791 | return sprintf(buf, "%u\n", limit); | |
792 | } | |
793 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); | |
794 | } | |
795 | ||
6dad2a29 BP |
796 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
797 | cpufreq_freq_attr_ro(cpuinfo_min_freq); | |
798 | cpufreq_freq_attr_ro(cpuinfo_max_freq); | |
799 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); | |
800 | cpufreq_freq_attr_ro(scaling_available_governors); | |
801 | cpufreq_freq_attr_ro(scaling_driver); | |
802 | cpufreq_freq_attr_ro(scaling_cur_freq); | |
803 | cpufreq_freq_attr_ro(bios_limit); | |
804 | cpufreq_freq_attr_ro(related_cpus); | |
805 | cpufreq_freq_attr_ro(affected_cpus); | |
806 | cpufreq_freq_attr_rw(scaling_min_freq); | |
807 | cpufreq_freq_attr_rw(scaling_max_freq); | |
808 | cpufreq_freq_attr_rw(scaling_governor); | |
809 | cpufreq_freq_attr_rw(scaling_setspeed); | |
1da177e4 | 810 | |
905d77cd | 811 | static struct attribute *default_attrs[] = { |
1da177e4 LT |
812 | &cpuinfo_min_freq.attr, |
813 | &cpuinfo_max_freq.attr, | |
ed129784 | 814 | &cpuinfo_transition_latency.attr, |
1da177e4 LT |
815 | &scaling_min_freq.attr, |
816 | &scaling_max_freq.attr, | |
817 | &affected_cpus.attr, | |
e8628dd0 | 818 | &related_cpus.attr, |
1da177e4 LT |
819 | &scaling_governor.attr, |
820 | &scaling_driver.attr, | |
821 | &scaling_available_governors.attr, | |
9e76988e | 822 | &scaling_setspeed.attr, |
1da177e4 LT |
823 | NULL |
824 | }; | |
825 | ||
29464f28 DJ |
826 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
827 | #define to_attr(a) container_of(a, struct freq_attr, attr) | |
1da177e4 | 828 | |
29464f28 | 829 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
1da177e4 | 830 | { |
905d77cd DJ |
831 | struct cpufreq_policy *policy = to_policy(kobj); |
832 | struct freq_attr *fattr = to_attr(attr); | |
1b750e3b | 833 | ssize_t ret; |
6eed9404 | 834 | |
ad7722da | 835 | down_read(&policy->rwsem); |
5a01f2e8 | 836 | |
e08f5f5b GS |
837 | if (fattr->show) |
838 | ret = fattr->show(policy, buf); | |
839 | else | |
840 | ret = -EIO; | |
841 | ||
ad7722da | 842 | up_read(&policy->rwsem); |
1b750e3b | 843 | |
1da177e4 LT |
844 | return ret; |
845 | } | |
846 | ||
905d77cd DJ |
847 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
848 | const char *buf, size_t count) | |
1da177e4 | 849 | { |
905d77cd DJ |
850 | struct cpufreq_policy *policy = to_policy(kobj); |
851 | struct freq_attr *fattr = to_attr(attr); | |
a07530b4 | 852 | ssize_t ret = -EINVAL; |
6eed9404 | 853 | |
4f750c93 SB |
854 | get_online_cpus(); |
855 | ||
856 | if (!cpu_online(policy->cpu)) | |
857 | goto unlock; | |
858 | ||
ad7722da | 859 | down_write(&policy->rwsem); |
5a01f2e8 | 860 | |
11e584cf VK |
861 | /* Updating inactive policies is invalid, so avoid doing that. */ |
862 | if (unlikely(policy_is_inactive(policy))) { | |
863 | ret = -EBUSY; | |
864 | goto unlock_policy_rwsem; | |
865 | } | |
866 | ||
e08f5f5b GS |
867 | if (fattr->store) |
868 | ret = fattr->store(policy, buf, count); | |
869 | else | |
870 | ret = -EIO; | |
871 | ||
11e584cf | 872 | unlock_policy_rwsem: |
ad7722da | 873 | up_write(&policy->rwsem); |
4f750c93 SB |
874 | unlock: |
875 | put_online_cpus(); | |
876 | ||
1da177e4 LT |
877 | return ret; |
878 | } | |
879 | ||
905d77cd | 880 | static void cpufreq_sysfs_release(struct kobject *kobj) |
1da177e4 | 881 | { |
905d77cd | 882 | struct cpufreq_policy *policy = to_policy(kobj); |
2d06d8c4 | 883 | pr_debug("last reference is dropped\n"); |
1da177e4 LT |
884 | complete(&policy->kobj_unregister); |
885 | } | |
886 | ||
52cf25d0 | 887 | static const struct sysfs_ops sysfs_ops = { |
1da177e4 LT |
888 | .show = show, |
889 | .store = store, | |
890 | }; | |
891 | ||
892 | static struct kobj_type ktype_cpufreq = { | |
893 | .sysfs_ops = &sysfs_ops, | |
894 | .default_attrs = default_attrs, | |
895 | .release = cpufreq_sysfs_release, | |
896 | }; | |
897 | ||
2361be23 VK |
898 | struct kobject *cpufreq_global_kobject; |
899 | EXPORT_SYMBOL(cpufreq_global_kobject); | |
900 | ||
901 | static int cpufreq_global_kobject_usage; | |
902 | ||
903 | int cpufreq_get_global_kobject(void) | |
904 | { | |
905 | if (!cpufreq_global_kobject_usage++) | |
906 | return kobject_add(cpufreq_global_kobject, | |
907 | &cpu_subsys.dev_root->kobj, "%s", "cpufreq"); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | EXPORT_SYMBOL(cpufreq_get_global_kobject); | |
912 | ||
913 | void cpufreq_put_global_kobject(void) | |
914 | { | |
915 | if (!--cpufreq_global_kobject_usage) | |
916 | kobject_del(cpufreq_global_kobject); | |
917 | } | |
918 | EXPORT_SYMBOL(cpufreq_put_global_kobject); | |
919 | ||
920 | int cpufreq_sysfs_create_file(const struct attribute *attr) | |
921 | { | |
922 | int ret = cpufreq_get_global_kobject(); | |
923 | ||
924 | if (!ret) { | |
925 | ret = sysfs_create_file(cpufreq_global_kobject, attr); | |
926 | if (ret) | |
927 | cpufreq_put_global_kobject(); | |
928 | } | |
929 | ||
930 | return ret; | |
931 | } | |
932 | EXPORT_SYMBOL(cpufreq_sysfs_create_file); | |
933 | ||
934 | void cpufreq_sysfs_remove_file(const struct attribute *attr) | |
935 | { | |
936 | sysfs_remove_file(cpufreq_global_kobject, attr); | |
937 | cpufreq_put_global_kobject(); | |
938 | } | |
939 | EXPORT_SYMBOL(cpufreq_sysfs_remove_file); | |
940 | ||
87549141 VK |
941 | static int add_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu) |
942 | { | |
943 | struct device *cpu_dev; | |
944 | ||
945 | pr_debug("%s: Adding symlink for CPU: %u\n", __func__, cpu); | |
946 | ||
947 | if (!policy) | |
948 | return 0; | |
949 | ||
950 | cpu_dev = get_cpu_device(cpu); | |
951 | if (WARN_ON(!cpu_dev)) | |
952 | return 0; | |
953 | ||
954 | return sysfs_create_link(&cpu_dev->kobj, &policy->kobj, "cpufreq"); | |
955 | } | |
956 | ||
957 | static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu) | |
958 | { | |
959 | struct device *cpu_dev; | |
960 | ||
961 | pr_debug("%s: Removing symlink for CPU: %u\n", __func__, cpu); | |
962 | ||
963 | cpu_dev = get_cpu_device(cpu); | |
964 | if (WARN_ON(!cpu_dev)) | |
965 | return; | |
966 | ||
967 | sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); | |
968 | } | |
969 | ||
970 | /* Add/remove symlinks for all related CPUs */ | |
308b60e7 | 971 | static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy) |
19d6f7ec DJ |
972 | { |
973 | unsigned int j; | |
974 | int ret = 0; | |
975 | ||
87549141 | 976 | /* Some related CPUs might not be present (physically hotplugged) */ |
559ed407 | 977 | for_each_cpu(j, policy->real_cpus) { |
9d16f207 | 978 | if (j == policy->kobj_cpu) |
19d6f7ec | 979 | continue; |
19d6f7ec | 980 | |
87549141 | 981 | ret = add_cpu_dev_symlink(policy, j); |
71c3461e RW |
982 | if (ret) |
983 | break; | |
19d6f7ec | 984 | } |
87549141 | 985 | |
19d6f7ec DJ |
986 | return ret; |
987 | } | |
988 | ||
87549141 VK |
989 | static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy) |
990 | { | |
991 | unsigned int j; | |
992 | ||
993 | /* Some related CPUs might not be present (physically hotplugged) */ | |
559ed407 | 994 | for_each_cpu(j, policy->real_cpus) { |
87549141 VK |
995 | if (j == policy->kobj_cpu) |
996 | continue; | |
997 | ||
998 | remove_cpu_dev_symlink(policy, j); | |
999 | } | |
1000 | } | |
1001 | ||
d9612a49 | 1002 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) |
909a694e DJ |
1003 | { |
1004 | struct freq_attr **drv_attr; | |
909a694e | 1005 | int ret = 0; |
909a694e | 1006 | |
909a694e | 1007 | /* set up files for this cpu device */ |
1c3d85dd | 1008 | drv_attr = cpufreq_driver->attr; |
f13f1184 | 1009 | while (drv_attr && *drv_attr) { |
909a694e DJ |
1010 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
1011 | if (ret) | |
6d4e81ed | 1012 | return ret; |
909a694e DJ |
1013 | drv_attr++; |
1014 | } | |
1c3d85dd | 1015 | if (cpufreq_driver->get) { |
909a694e DJ |
1016 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
1017 | if (ret) | |
6d4e81ed | 1018 | return ret; |
909a694e | 1019 | } |
c034b02e DB |
1020 | |
1021 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); | |
1022 | if (ret) | |
6d4e81ed | 1023 | return ret; |
c034b02e | 1024 | |
1c3d85dd | 1025 | if (cpufreq_driver->bios_limit) { |
e2f74f35 TR |
1026 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
1027 | if (ret) | |
6d4e81ed | 1028 | return ret; |
e2f74f35 | 1029 | } |
909a694e | 1030 | |
6d4e81ed | 1031 | return cpufreq_add_dev_symlink(policy); |
e18f1682 SB |
1032 | } |
1033 | ||
7f0fa40f | 1034 | static int cpufreq_init_policy(struct cpufreq_policy *policy) |
e18f1682 | 1035 | { |
6e2c89d1 | 1036 | struct cpufreq_governor *gov = NULL; |
e18f1682 | 1037 | struct cpufreq_policy new_policy; |
e18f1682 | 1038 | |
d5b73cd8 | 1039 | memcpy(&new_policy, policy, sizeof(*policy)); |
a27a9ab7 | 1040 | |
6e2c89d1 | 1041 | /* Update governor of new_policy to the governor used before hotplug */ |
4573237b | 1042 | gov = find_governor(policy->last_governor); |
6e2c89d1 | 1043 | if (gov) |
1044 | pr_debug("Restoring governor %s for cpu %d\n", | |
1045 | policy->governor->name, policy->cpu); | |
1046 | else | |
1047 | gov = CPUFREQ_DEFAULT_GOVERNOR; | |
1048 | ||
1049 | new_policy.governor = gov; | |
1050 | ||
a27a9ab7 JB |
1051 | /* Use the default policy if its valid. */ |
1052 | if (cpufreq_driver->setpolicy) | |
6e2c89d1 | 1053 | cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); |
ecf7e461 DJ |
1054 | |
1055 | /* set default policy */ | |
7f0fa40f | 1056 | return cpufreq_set_policy(policy, &new_policy); |
909a694e DJ |
1057 | } |
1058 | ||
d9612a49 | 1059 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) |
fcf80582 | 1060 | { |
9c0ebcf7 | 1061 | int ret = 0; |
fcf80582 | 1062 | |
bb29ae15 VK |
1063 | /* Has this CPU been taken care of already? */ |
1064 | if (cpumask_test_cpu(cpu, policy->cpus)) | |
1065 | return 0; | |
1066 | ||
9c0ebcf7 | 1067 | if (has_target()) { |
3de9bdeb VK |
1068 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
1069 | if (ret) { | |
1070 | pr_err("%s: Failed to stop governor\n", __func__); | |
1071 | return ret; | |
1072 | } | |
1073 | } | |
fcf80582 | 1074 | |
ad7722da | 1075 | down_write(&policy->rwsem); |
fcf80582 | 1076 | cpumask_set_cpu(cpu, policy->cpus); |
ad7722da | 1077 | up_write(&policy->rwsem); |
2eaa3e2d | 1078 | |
9c0ebcf7 | 1079 | if (has_target()) { |
e5c87b76 SK |
1080 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
1081 | if (!ret) | |
1082 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1083 | ||
1084 | if (ret) { | |
3de9bdeb VK |
1085 | pr_err("%s: Failed to start governor\n", __func__); |
1086 | return ret; | |
1087 | } | |
820c6ca2 | 1088 | } |
fcf80582 | 1089 | |
87549141 | 1090 | return 0; |
fcf80582 | 1091 | } |
1da177e4 | 1092 | |
a34e63b1 | 1093 | static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) |
e9698cc5 | 1094 | { |
a34e63b1 | 1095 | struct device *dev = get_cpu_device(cpu); |
e9698cc5 | 1096 | struct cpufreq_policy *policy; |
2fc3384d | 1097 | int ret; |
e9698cc5 | 1098 | |
a34e63b1 RW |
1099 | if (WARN_ON(!dev)) |
1100 | return NULL; | |
1101 | ||
e9698cc5 SB |
1102 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); |
1103 | if (!policy) | |
1104 | return NULL; | |
1105 | ||
1106 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) | |
1107 | goto err_free_policy; | |
1108 | ||
1109 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) | |
1110 | goto err_free_cpumask; | |
1111 | ||
559ed407 RW |
1112 | if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) |
1113 | goto err_free_rcpumask; | |
1114 | ||
2fc3384d VK |
1115 | ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &dev->kobj, |
1116 | "cpufreq"); | |
1117 | if (ret) { | |
1118 | pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret); | |
559ed407 | 1119 | goto err_free_real_cpus; |
2fc3384d VK |
1120 | } |
1121 | ||
c88a1f8b | 1122 | INIT_LIST_HEAD(&policy->policy_list); |
ad7722da | 1123 | init_rwsem(&policy->rwsem); |
12478cf0 SB |
1124 | spin_lock_init(&policy->transition_lock); |
1125 | init_waitqueue_head(&policy->transition_wait); | |
818c5712 VK |
1126 | init_completion(&policy->kobj_unregister); |
1127 | INIT_WORK(&policy->update, handle_update); | |
ad7722da | 1128 | |
a34e63b1 | 1129 | policy->cpu = cpu; |
87549141 VK |
1130 | |
1131 | /* Set this once on allocation */ | |
a34e63b1 | 1132 | policy->kobj_cpu = cpu; |
87549141 | 1133 | |
e9698cc5 SB |
1134 | return policy; |
1135 | ||
559ed407 RW |
1136 | err_free_real_cpus: |
1137 | free_cpumask_var(policy->real_cpus); | |
2fc3384d VK |
1138 | err_free_rcpumask: |
1139 | free_cpumask_var(policy->related_cpus); | |
e9698cc5 SB |
1140 | err_free_cpumask: |
1141 | free_cpumask_var(policy->cpus); | |
1142 | err_free_policy: | |
1143 | kfree(policy); | |
1144 | ||
1145 | return NULL; | |
1146 | } | |
1147 | ||
2fc3384d | 1148 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy, bool notify) |
42f921a6 VK |
1149 | { |
1150 | struct kobject *kobj; | |
1151 | struct completion *cmp; | |
1152 | ||
2fc3384d VK |
1153 | if (notify) |
1154 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, | |
1155 | CPUFREQ_REMOVE_POLICY, policy); | |
fcd7af91 | 1156 | |
87549141 VK |
1157 | down_write(&policy->rwsem); |
1158 | cpufreq_remove_dev_symlink(policy); | |
42f921a6 VK |
1159 | kobj = &policy->kobj; |
1160 | cmp = &policy->kobj_unregister; | |
87549141 | 1161 | up_write(&policy->rwsem); |
42f921a6 VK |
1162 | kobject_put(kobj); |
1163 | ||
1164 | /* | |
1165 | * We need to make sure that the underlying kobj is | |
1166 | * actually not referenced anymore by anybody before we | |
1167 | * proceed with unloading. | |
1168 | */ | |
1169 | pr_debug("waiting for dropping of refcount\n"); | |
1170 | wait_for_completion(cmp); | |
1171 | pr_debug("wait complete\n"); | |
1172 | } | |
1173 | ||
3654c5cc | 1174 | static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) |
e9698cc5 | 1175 | { |
988bed09 VK |
1176 | unsigned long flags; |
1177 | int cpu; | |
1178 | ||
1179 | /* Remove policy from list */ | |
1180 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
1181 | list_del(&policy->policy_list); | |
1182 | ||
1183 | for_each_cpu(cpu, policy->related_cpus) | |
1184 | per_cpu(cpufreq_cpu_data, cpu) = NULL; | |
1185 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1186 | ||
3654c5cc | 1187 | cpufreq_policy_put_kobj(policy, notify); |
559ed407 | 1188 | free_cpumask_var(policy->real_cpus); |
e9698cc5 SB |
1189 | free_cpumask_var(policy->related_cpus); |
1190 | free_cpumask_var(policy->cpus); | |
1191 | kfree(policy); | |
1192 | } | |
1193 | ||
0b275352 | 1194 | static int cpufreq_online(unsigned int cpu) |
1da177e4 | 1195 | { |
7f0c020a | 1196 | struct cpufreq_policy *policy; |
194d99c7 | 1197 | bool new_policy; |
0b275352 RW |
1198 | unsigned long flags; |
1199 | unsigned int j; | |
1200 | int ret; | |
c32b6b8e | 1201 | |
0b275352 | 1202 | pr_debug("%s: bringing CPU%u online\n", __func__, cpu); |
87549141 | 1203 | |
bb29ae15 | 1204 | /* Check if this CPU already has a policy to manage it */ |
9104bb26 | 1205 | policy = per_cpu(cpufreq_cpu_data, cpu); |
11ce707e | 1206 | if (policy) { |
9104bb26 | 1207 | WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); |
11ce707e | 1208 | if (!policy_is_inactive(policy)) |
d9612a49 | 1209 | return cpufreq_add_policy_cpu(policy, cpu); |
1da177e4 | 1210 | |
11ce707e | 1211 | /* This is the only online CPU for the policy. Start over. */ |
194d99c7 | 1212 | new_policy = false; |
11ce707e RW |
1213 | down_write(&policy->rwsem); |
1214 | policy->cpu = cpu; | |
1215 | policy->governor = NULL; | |
1216 | up_write(&policy->rwsem); | |
1217 | } else { | |
194d99c7 | 1218 | new_policy = true; |
a34e63b1 | 1219 | policy = cpufreq_policy_alloc(cpu); |
72368d12 | 1220 | if (!policy) |
d4d854d6 | 1221 | return -ENOMEM; |
72368d12 | 1222 | } |
0d66b91e | 1223 | |
835481d9 | 1224 | cpumask_copy(policy->cpus, cpumask_of(cpu)); |
1da177e4 | 1225 | |
1da177e4 LT |
1226 | /* call driver. From then on the cpufreq must be able |
1227 | * to accept all calls to ->verify and ->setpolicy for this CPU | |
1228 | */ | |
1c3d85dd | 1229 | ret = cpufreq_driver->init(policy); |
1da177e4 | 1230 | if (ret) { |
2d06d8c4 | 1231 | pr_debug("initialization failed\n"); |
8101f997 | 1232 | goto out_free_policy; |
1da177e4 | 1233 | } |
643ae6e8 | 1234 | |
6d4e81ed TV |
1235 | down_write(&policy->rwsem); |
1236 | ||
194d99c7 | 1237 | if (new_policy) { |
4d1f3a5b RW |
1238 | /* related_cpus should at least include policy->cpus. */ |
1239 | cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); | |
1240 | /* Remember CPUs present at the policy creation time. */ | |
559ed407 | 1241 | cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask); |
4d1f3a5b | 1242 | } |
559ed407 | 1243 | |
5a7e56a5 VK |
1244 | /* |
1245 | * affected cpus must always be the one, which are online. We aren't | |
1246 | * managing offline cpus here. | |
1247 | */ | |
1248 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); | |
1249 | ||
194d99c7 | 1250 | if (new_policy) { |
5a7e56a5 VK |
1251 | policy->user_policy.min = policy->min; |
1252 | policy->user_policy.max = policy->max; | |
6d4e81ed | 1253 | |
988bed09 VK |
1254 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1255 | for_each_cpu(j, policy->related_cpus) | |
1256 | per_cpu(cpufreq_cpu_data, j) = policy; | |
1257 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1258 | } | |
652ed95d | 1259 | |
2ed99e39 | 1260 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
da60ce9f VK |
1261 | policy->cur = cpufreq_driver->get(policy->cpu); |
1262 | if (!policy->cur) { | |
1263 | pr_err("%s: ->get() failed\n", __func__); | |
8101f997 | 1264 | goto out_exit_policy; |
da60ce9f VK |
1265 | } |
1266 | } | |
1267 | ||
d3916691 VK |
1268 | /* |
1269 | * Sometimes boot loaders set CPU frequency to a value outside of | |
1270 | * frequency table present with cpufreq core. In such cases CPU might be | |
1271 | * unstable if it has to run on that frequency for long duration of time | |
1272 | * and so its better to set it to a frequency which is specified in | |
1273 | * freq-table. This also makes cpufreq stats inconsistent as | |
1274 | * cpufreq-stats would fail to register because current frequency of CPU | |
1275 | * isn't found in freq-table. | |
1276 | * | |
1277 | * Because we don't want this change to effect boot process badly, we go | |
1278 | * for the next freq which is >= policy->cur ('cur' must be set by now, | |
1279 | * otherwise we will end up setting freq to lowest of the table as 'cur' | |
1280 | * is initialized to zero). | |
1281 | * | |
1282 | * We are passing target-freq as "policy->cur - 1" otherwise | |
1283 | * __cpufreq_driver_target() would simply fail, as policy->cur will be | |
1284 | * equal to target-freq. | |
1285 | */ | |
1286 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) | |
1287 | && has_target()) { | |
1288 | /* Are we running at unknown frequency ? */ | |
1289 | ret = cpufreq_frequency_table_get_index(policy, policy->cur); | |
1290 | if (ret == -EINVAL) { | |
1291 | /* Warn user and fix it */ | |
1292 | pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", | |
1293 | __func__, policy->cpu, policy->cur); | |
1294 | ret = __cpufreq_driver_target(policy, policy->cur - 1, | |
1295 | CPUFREQ_RELATION_L); | |
1296 | ||
1297 | /* | |
1298 | * Reaching here after boot in a few seconds may not | |
1299 | * mean that system will remain stable at "unknown" | |
1300 | * frequency for longer duration. Hence, a BUG_ON(). | |
1301 | */ | |
1302 | BUG_ON(ret); | |
1303 | pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", | |
1304 | __func__, policy->cpu, policy->cur); | |
1305 | } | |
1306 | } | |
1307 | ||
a1531acd TR |
1308 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1309 | CPUFREQ_START, policy); | |
1310 | ||
194d99c7 | 1311 | if (new_policy) { |
d9612a49 | 1312 | ret = cpufreq_add_dev_interface(policy); |
a82fab29 | 1313 | if (ret) |
8101f997 | 1314 | goto out_exit_policy; |
fcd7af91 VK |
1315 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1316 | CPUFREQ_CREATE_POLICY, policy); | |
8ff69732 | 1317 | |
988bed09 VK |
1318 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1319 | list_add(&policy->policy_list, &cpufreq_policy_list); | |
1320 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1321 | } | |
9515f4d6 | 1322 | |
7f0fa40f VK |
1323 | ret = cpufreq_init_policy(policy); |
1324 | if (ret) { | |
1325 | pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", | |
1326 | __func__, cpu, ret); | |
194d99c7 RW |
1327 | /* cpufreq_policy_free() will notify based on this */ |
1328 | new_policy = false; | |
1329 | goto out_exit_policy; | |
7f0fa40f | 1330 | } |
e18f1682 | 1331 | |
194d99c7 | 1332 | if (new_policy) { |
08fd8c1c VK |
1333 | policy->user_policy.policy = policy->policy; |
1334 | policy->user_policy.governor = policy->governor; | |
1335 | } | |
4e97b631 | 1336 | up_write(&policy->rwsem); |
08fd8c1c | 1337 | |
038c5b3e | 1338 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
7c45cf31 | 1339 | |
7c45cf31 VK |
1340 | /* Callback for handling stuff after policy is ready */ |
1341 | if (cpufreq_driver->ready) | |
1342 | cpufreq_driver->ready(policy); | |
1343 | ||
2d06d8c4 | 1344 | pr_debug("initialization complete\n"); |
87c32271 | 1345 | |
1da177e4 LT |
1346 | return 0; |
1347 | ||
8101f997 | 1348 | out_exit_policy: |
7106e02b PB |
1349 | up_write(&policy->rwsem); |
1350 | ||
da60ce9f VK |
1351 | if (cpufreq_driver->exit) |
1352 | cpufreq_driver->exit(policy); | |
8101f997 | 1353 | out_free_policy: |
194d99c7 | 1354 | cpufreq_policy_free(policy, !new_policy); |
1da177e4 LT |
1355 | return ret; |
1356 | } | |
1357 | ||
0b275352 RW |
1358 | /** |
1359 | * cpufreq_add_dev - the cpufreq interface for a CPU device. | |
1360 | * @dev: CPU device. | |
1361 | * @sif: Subsystem interface structure pointer (not used) | |
1362 | */ | |
1363 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) | |
1364 | { | |
1365 | unsigned cpu = dev->id; | |
1366 | int ret; | |
1367 | ||
1368 | dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu); | |
1369 | ||
1370 | if (cpu_online(cpu)) { | |
1371 | ret = cpufreq_online(cpu); | |
1372 | } else { | |
1373 | /* | |
1374 | * A hotplug notifier will follow and we will handle it as CPU | |
1375 | * online then. For now, just create the sysfs link, unless | |
1376 | * there is no policy or the link is already present. | |
1377 | */ | |
1378 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); | |
1379 | ||
1380 | ret = policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus) | |
1381 | ? add_cpu_dev_symlink(policy, cpu) : 0; | |
1382 | } | |
1383 | ||
1384 | return ret; | |
1385 | } | |
1386 | ||
15c0b4d2 | 1387 | static void cpufreq_offline_prepare(unsigned int cpu) |
1da177e4 | 1388 | { |
3a3e9e06 | 1389 | struct cpufreq_policy *policy; |
1da177e4 | 1390 | |
b8eed8af | 1391 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
1da177e4 | 1392 | |
988bed09 | 1393 | policy = cpufreq_cpu_get_raw(cpu); |
3a3e9e06 | 1394 | if (!policy) { |
b8eed8af | 1395 | pr_debug("%s: No cpu_data found\n", __func__); |
15c0b4d2 | 1396 | return; |
1da177e4 | 1397 | } |
1da177e4 | 1398 | |
9c0ebcf7 | 1399 | if (has_target()) { |
15c0b4d2 | 1400 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
559ed407 | 1401 | if (ret) |
3de9bdeb | 1402 | pr_err("%s: Failed to stop governor\n", __func__); |
db5f2995 | 1403 | } |
1da177e4 | 1404 | |
4573237b | 1405 | down_write(&policy->rwsem); |
9591becb | 1406 | cpumask_clear_cpu(cpu, policy->cpus); |
4573237b | 1407 | |
9591becb VK |
1408 | if (policy_is_inactive(policy)) { |
1409 | if (has_target()) | |
1410 | strncpy(policy->last_governor, policy->governor->name, | |
1411 | CPUFREQ_NAME_LEN); | |
1412 | } else if (cpu == policy->cpu) { | |
1413 | /* Nominate new CPU */ | |
1414 | policy->cpu = cpumask_any(policy->cpus); | |
1415 | } | |
4573237b | 1416 | up_write(&policy->rwsem); |
084f3493 | 1417 | |
9591becb VK |
1418 | /* Start governor again for active policy */ |
1419 | if (!policy_is_inactive(policy)) { | |
1420 | if (has_target()) { | |
15c0b4d2 | 1421 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
9591becb VK |
1422 | if (!ret) |
1423 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1bfb425b | 1424 | |
9591becb VK |
1425 | if (ret) |
1426 | pr_err("%s: Failed to start governor\n", __func__); | |
1427 | } | |
1428 | } else if (cpufreq_driver->stop_cpu) { | |
367dc4aa | 1429 | cpufreq_driver->stop_cpu(policy); |
9591becb | 1430 | } |
cedb70af SB |
1431 | } |
1432 | ||
15c0b4d2 | 1433 | static void cpufreq_offline_finish(unsigned int cpu) |
cedb70af | 1434 | { |
9591becb | 1435 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
cedb70af SB |
1436 | |
1437 | if (!policy) { | |
1438 | pr_debug("%s: No cpu_data found\n", __func__); | |
15c0b4d2 | 1439 | return; |
cedb70af SB |
1440 | } |
1441 | ||
9591becb VK |
1442 | /* Only proceed for inactive policies */ |
1443 | if (!policy_is_inactive(policy)) | |
15c0b4d2 | 1444 | return; |
87549141 VK |
1445 | |
1446 | /* If cpu is last user of policy, free policy */ | |
1447 | if (has_target()) { | |
15c0b4d2 | 1448 | int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
559ed407 | 1449 | if (ret) |
87549141 | 1450 | pr_err("%s: Failed to exit governor\n", __func__); |
27ecddc2 | 1451 | } |
1da177e4 | 1452 | |
87549141 VK |
1453 | /* |
1454 | * Perform the ->exit() even during light-weight tear-down, | |
1455 | * since this is a core component, and is essential for the | |
1456 | * subsequent light-weight ->init() to succeed. | |
1457 | */ | |
1458 | if (cpufreq_driver->exit) | |
1459 | cpufreq_driver->exit(policy); | |
1da177e4 LT |
1460 | } |
1461 | ||
cedb70af | 1462 | /** |
27a862e9 | 1463 | * cpufreq_remove_dev - remove a CPU device |
cedb70af SB |
1464 | * |
1465 | * Removes the cpufreq interface for a CPU device. | |
cedb70af | 1466 | */ |
8a25a2fd | 1467 | static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
5a01f2e8 | 1468 | { |
8a25a2fd | 1469 | unsigned int cpu = dev->id; |
559ed407 | 1470 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
87549141 | 1471 | |
559ed407 RW |
1472 | if (!policy) |
1473 | return 0; | |
87549141 | 1474 | |
559ed407 | 1475 | if (cpu_online(cpu)) { |
15c0b4d2 RW |
1476 | cpufreq_offline_prepare(cpu); |
1477 | cpufreq_offline_finish(cpu); | |
559ed407 | 1478 | } |
87549141 | 1479 | |
559ed407 | 1480 | cpumask_clear_cpu(cpu, policy->real_cpus); |
87549141 | 1481 | |
559ed407 | 1482 | if (cpumask_empty(policy->real_cpus)) { |
3654c5cc | 1483 | cpufreq_policy_free(policy, true); |
ec28297a | 1484 | return 0; |
87549141 | 1485 | } |
ec28297a | 1486 | |
559ed407 RW |
1487 | if (cpu != policy->kobj_cpu) { |
1488 | remove_cpu_dev_symlink(policy, cpu); | |
1489 | } else { | |
1490 | /* | |
1491 | * The CPU owning the policy object is going away. Move it to | |
1492 | * another suitable CPU. | |
1493 | */ | |
1494 | unsigned int new_cpu = cpumask_first(policy->real_cpus); | |
1495 | struct device *new_dev = get_cpu_device(new_cpu); | |
1496 | ||
1497 | dev_dbg(dev, "%s: Moving policy object to CPU%u\n", __func__, new_cpu); | |
27a862e9 | 1498 | |
559ed407 RW |
1499 | sysfs_remove_link(&new_dev->kobj, "cpufreq"); |
1500 | policy->kobj_cpu = new_cpu; | |
1501 | WARN_ON(kobject_move(&policy->kobj, &new_dev->kobj)); | |
1502 | } | |
27a862e9 | 1503 | |
559ed407 | 1504 | return 0; |
5a01f2e8 VP |
1505 | } |
1506 | ||
65f27f38 | 1507 | static void handle_update(struct work_struct *work) |
1da177e4 | 1508 | { |
65f27f38 DH |
1509 | struct cpufreq_policy *policy = |
1510 | container_of(work, struct cpufreq_policy, update); | |
1511 | unsigned int cpu = policy->cpu; | |
2d06d8c4 | 1512 | pr_debug("handle_update for cpu %u called\n", cpu); |
1da177e4 LT |
1513 | cpufreq_update_policy(cpu); |
1514 | } | |
1515 | ||
1516 | /** | |
bb176f7d VK |
1517 | * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're |
1518 | * in deep trouble. | |
a1e1dc41 | 1519 | * @policy: policy managing CPUs |
1da177e4 LT |
1520 | * @new_freq: CPU frequency the CPU actually runs at |
1521 | * | |
29464f28 DJ |
1522 | * We adjust to current frequency first, and need to clean up later. |
1523 | * So either call to cpufreq_update_policy() or schedule handle_update()). | |
1da177e4 | 1524 | */ |
a1e1dc41 | 1525 | static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
e08f5f5b | 1526 | unsigned int new_freq) |
1da177e4 LT |
1527 | { |
1528 | struct cpufreq_freqs freqs; | |
b43a7ffb | 1529 | |
e837f9b5 | 1530 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
a1e1dc41 | 1531 | policy->cur, new_freq); |
1da177e4 | 1532 | |
a1e1dc41 | 1533 | freqs.old = policy->cur; |
1da177e4 | 1534 | freqs.new = new_freq; |
b43a7ffb | 1535 | |
8fec051e VK |
1536 | cpufreq_freq_transition_begin(policy, &freqs); |
1537 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1da177e4 LT |
1538 | } |
1539 | ||
32ee8c3e | 1540 | /** |
4ab70df4 | 1541 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
95235ca2 VP |
1542 | * @cpu: CPU number |
1543 | * | |
1544 | * This is the last known freq, without actually getting it from the driver. | |
1545 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. | |
1546 | */ | |
1547 | unsigned int cpufreq_quick_get(unsigned int cpu) | |
1548 | { | |
9e21ba8b | 1549 | struct cpufreq_policy *policy; |
e08f5f5b | 1550 | unsigned int ret_freq = 0; |
95235ca2 | 1551 | |
1c3d85dd RW |
1552 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
1553 | return cpufreq_driver->get(cpu); | |
9e21ba8b DB |
1554 | |
1555 | policy = cpufreq_cpu_get(cpu); | |
95235ca2 | 1556 | if (policy) { |
e08f5f5b | 1557 | ret_freq = policy->cur; |
95235ca2 VP |
1558 | cpufreq_cpu_put(policy); |
1559 | } | |
1560 | ||
4d34a67d | 1561 | return ret_freq; |
95235ca2 VP |
1562 | } |
1563 | EXPORT_SYMBOL(cpufreq_quick_get); | |
1564 | ||
3d737108 JB |
1565 | /** |
1566 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU | |
1567 | * @cpu: CPU number | |
1568 | * | |
1569 | * Just return the max possible frequency for a given CPU. | |
1570 | */ | |
1571 | unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
1572 | { | |
1573 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
1574 | unsigned int ret_freq = 0; | |
1575 | ||
1576 | if (policy) { | |
1577 | ret_freq = policy->max; | |
1578 | cpufreq_cpu_put(policy); | |
1579 | } | |
1580 | ||
1581 | return ret_freq; | |
1582 | } | |
1583 | EXPORT_SYMBOL(cpufreq_quick_get_max); | |
1584 | ||
d92d50a4 | 1585 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
1da177e4 | 1586 | { |
e08f5f5b | 1587 | unsigned int ret_freq = 0; |
5800043b | 1588 | |
1c3d85dd | 1589 | if (!cpufreq_driver->get) |
4d34a67d | 1590 | return ret_freq; |
1da177e4 | 1591 | |
d92d50a4 | 1592 | ret_freq = cpufreq_driver->get(policy->cpu); |
1da177e4 | 1593 | |
11e584cf VK |
1594 | /* Updating inactive policies is invalid, so avoid doing that. */ |
1595 | if (unlikely(policy_is_inactive(policy))) | |
1596 | return ret_freq; | |
1597 | ||
e08f5f5b | 1598 | if (ret_freq && policy->cur && |
1c3d85dd | 1599 | !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e08f5f5b GS |
1600 | /* verify no discrepancy between actual and |
1601 | saved value exists */ | |
1602 | if (unlikely(ret_freq != policy->cur)) { | |
a1e1dc41 | 1603 | cpufreq_out_of_sync(policy, ret_freq); |
1da177e4 LT |
1604 | schedule_work(&policy->update); |
1605 | } | |
1606 | } | |
1607 | ||
4d34a67d | 1608 | return ret_freq; |
5a01f2e8 | 1609 | } |
1da177e4 | 1610 | |
5a01f2e8 VP |
1611 | /** |
1612 | * cpufreq_get - get the current CPU frequency (in kHz) | |
1613 | * @cpu: CPU number | |
1614 | * | |
1615 | * Get the CPU current (static) CPU frequency | |
1616 | */ | |
1617 | unsigned int cpufreq_get(unsigned int cpu) | |
1618 | { | |
999976e0 | 1619 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
5a01f2e8 | 1620 | unsigned int ret_freq = 0; |
5a01f2e8 | 1621 | |
999976e0 AP |
1622 | if (policy) { |
1623 | down_read(&policy->rwsem); | |
d92d50a4 | 1624 | ret_freq = __cpufreq_get(policy); |
999976e0 | 1625 | up_read(&policy->rwsem); |
5a01f2e8 | 1626 | |
999976e0 AP |
1627 | cpufreq_cpu_put(policy); |
1628 | } | |
6eed9404 | 1629 | |
4d34a67d | 1630 | return ret_freq; |
1da177e4 LT |
1631 | } |
1632 | EXPORT_SYMBOL(cpufreq_get); | |
1633 | ||
8a25a2fd KS |
1634 | static struct subsys_interface cpufreq_interface = { |
1635 | .name = "cpufreq", | |
1636 | .subsys = &cpu_subsys, | |
1637 | .add_dev = cpufreq_add_dev, | |
1638 | .remove_dev = cpufreq_remove_dev, | |
e00e56df RW |
1639 | }; |
1640 | ||
e28867ea VK |
1641 | /* |
1642 | * In case platform wants some specific frequency to be configured | |
1643 | * during suspend.. | |
1644 | */ | |
1645 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) | |
1646 | { | |
1647 | int ret; | |
1648 | ||
1649 | if (!policy->suspend_freq) { | |
1650 | pr_err("%s: suspend_freq can't be zero\n", __func__); | |
1651 | return -EINVAL; | |
1652 | } | |
1653 | ||
1654 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, | |
1655 | policy->suspend_freq); | |
1656 | ||
1657 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, | |
1658 | CPUFREQ_RELATION_H); | |
1659 | if (ret) | |
1660 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", | |
1661 | __func__, policy->suspend_freq, ret); | |
1662 | ||
1663 | return ret; | |
1664 | } | |
1665 | EXPORT_SYMBOL(cpufreq_generic_suspend); | |
1666 | ||
42d4dc3f | 1667 | /** |
2f0aea93 | 1668 | * cpufreq_suspend() - Suspend CPUFreq governors |
e00e56df | 1669 | * |
2f0aea93 VK |
1670 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
1671 | * as some platforms can't change frequency after this point in suspend cycle. | |
1672 | * Because some of the devices (like: i2c, regulators, etc) they use for | |
1673 | * changing frequency are suspended quickly after this point. | |
42d4dc3f | 1674 | */ |
2f0aea93 | 1675 | void cpufreq_suspend(void) |
42d4dc3f | 1676 | { |
3a3e9e06 | 1677 | struct cpufreq_policy *policy; |
42d4dc3f | 1678 | |
2f0aea93 VK |
1679 | if (!cpufreq_driver) |
1680 | return; | |
42d4dc3f | 1681 | |
2f0aea93 | 1682 | if (!has_target()) |
b1b12bab | 1683 | goto suspend; |
42d4dc3f | 1684 | |
2f0aea93 VK |
1685 | pr_debug("%s: Suspending Governors\n", __func__); |
1686 | ||
f963735a | 1687 | for_each_active_policy(policy) { |
2f0aea93 VK |
1688 | if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) |
1689 | pr_err("%s: Failed to stop governor for policy: %p\n", | |
1690 | __func__, policy); | |
1691 | else if (cpufreq_driver->suspend | |
1692 | && cpufreq_driver->suspend(policy)) | |
1693 | pr_err("%s: Failed to suspend driver: %p\n", __func__, | |
1694 | policy); | |
42d4dc3f | 1695 | } |
b1b12bab VK |
1696 | |
1697 | suspend: | |
1698 | cpufreq_suspended = true; | |
42d4dc3f BH |
1699 | } |
1700 | ||
1da177e4 | 1701 | /** |
2f0aea93 | 1702 | * cpufreq_resume() - Resume CPUFreq governors |
1da177e4 | 1703 | * |
2f0aea93 VK |
1704 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
1705 | * are suspended with cpufreq_suspend(). | |
1da177e4 | 1706 | */ |
2f0aea93 | 1707 | void cpufreq_resume(void) |
1da177e4 | 1708 | { |
3a3e9e06 | 1709 | struct cpufreq_policy *policy; |
1da177e4 | 1710 | |
2f0aea93 VK |
1711 | if (!cpufreq_driver) |
1712 | return; | |
1da177e4 | 1713 | |
8e30444e LT |
1714 | cpufreq_suspended = false; |
1715 | ||
2f0aea93 | 1716 | if (!has_target()) |
e00e56df | 1717 | return; |
1da177e4 | 1718 | |
2f0aea93 | 1719 | pr_debug("%s: Resuming Governors\n", __func__); |
1da177e4 | 1720 | |
f963735a | 1721 | for_each_active_policy(policy) { |
0c5aa405 VK |
1722 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) |
1723 | pr_err("%s: Failed to resume driver: %p\n", __func__, | |
1724 | policy); | |
1725 | else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) | |
2f0aea93 VK |
1726 | || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) |
1727 | pr_err("%s: Failed to start governor for policy: %p\n", | |
1728 | __func__, policy); | |
2f0aea93 | 1729 | } |
c75de0ac VK |
1730 | |
1731 | /* | |
1732 | * schedule call cpufreq_update_policy() for first-online CPU, as that | |
1733 | * wouldn't be hotplugged-out on suspend. It will verify that the | |
1734 | * current freq is in sync with what we believe it to be. | |
1735 | */ | |
1736 | policy = cpufreq_cpu_get_raw(cpumask_first(cpu_online_mask)); | |
1737 | if (WARN_ON(!policy)) | |
1738 | return; | |
1739 | ||
1740 | schedule_work(&policy->update); | |
2f0aea93 | 1741 | } |
1da177e4 | 1742 | |
9d95046e BP |
1743 | /** |
1744 | * cpufreq_get_current_driver - return current driver's name | |
1745 | * | |
1746 | * Return the name string of the currently loaded cpufreq driver | |
1747 | * or NULL, if none. | |
1748 | */ | |
1749 | const char *cpufreq_get_current_driver(void) | |
1750 | { | |
1c3d85dd RW |
1751 | if (cpufreq_driver) |
1752 | return cpufreq_driver->name; | |
1753 | ||
1754 | return NULL; | |
9d95046e BP |
1755 | } |
1756 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); | |
1da177e4 | 1757 | |
51315cdf TP |
1758 | /** |
1759 | * cpufreq_get_driver_data - return current driver data | |
1760 | * | |
1761 | * Return the private data of the currently loaded cpufreq | |
1762 | * driver, or NULL if no cpufreq driver is loaded. | |
1763 | */ | |
1764 | void *cpufreq_get_driver_data(void) | |
1765 | { | |
1766 | if (cpufreq_driver) | |
1767 | return cpufreq_driver->driver_data; | |
1768 | ||
1769 | return NULL; | |
1770 | } | |
1771 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); | |
1772 | ||
1da177e4 LT |
1773 | /********************************************************************* |
1774 | * NOTIFIER LISTS INTERFACE * | |
1775 | *********************************************************************/ | |
1776 | ||
1777 | /** | |
1778 | * cpufreq_register_notifier - register a driver with cpufreq | |
1779 | * @nb: notifier function to register | |
1780 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER | |
1781 | * | |
32ee8c3e | 1782 | * Add a driver to one of two lists: either a list of drivers that |
1da177e4 LT |
1783 | * are notified about clock rate changes (once before and once after |
1784 | * the transition), or a list of drivers that are notified about | |
1785 | * changes in cpufreq policy. | |
1786 | * | |
1787 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1788 | * blocking_notifier_chain_register. |
1da177e4 LT |
1789 | */ |
1790 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) | |
1791 | { | |
1792 | int ret; | |
1793 | ||
d5aaffa9 DB |
1794 | if (cpufreq_disabled()) |
1795 | return -EINVAL; | |
1796 | ||
74212ca4 CEB |
1797 | WARN_ON(!init_cpufreq_transition_notifier_list_called); |
1798 | ||
1da177e4 LT |
1799 | switch (list) { |
1800 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1801 | ret = srcu_notifier_chain_register( |
e041c683 | 1802 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1803 | break; |
1804 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1805 | ret = blocking_notifier_chain_register( |
1806 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1807 | break; |
1808 | default: | |
1809 | ret = -EINVAL; | |
1810 | } | |
1da177e4 LT |
1811 | |
1812 | return ret; | |
1813 | } | |
1814 | EXPORT_SYMBOL(cpufreq_register_notifier); | |
1815 | ||
1da177e4 LT |
1816 | /** |
1817 | * cpufreq_unregister_notifier - unregister a driver with cpufreq | |
1818 | * @nb: notifier block to be unregistered | |
bb176f7d | 1819 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
1da177e4 LT |
1820 | * |
1821 | * Remove a driver from the CPU frequency notifier list. | |
1822 | * | |
1823 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1824 | * blocking_notifier_chain_unregister. |
1da177e4 LT |
1825 | */ |
1826 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) | |
1827 | { | |
1828 | int ret; | |
1829 | ||
d5aaffa9 DB |
1830 | if (cpufreq_disabled()) |
1831 | return -EINVAL; | |
1832 | ||
1da177e4 LT |
1833 | switch (list) { |
1834 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1835 | ret = srcu_notifier_chain_unregister( |
e041c683 | 1836 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1837 | break; |
1838 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1839 | ret = blocking_notifier_chain_unregister( |
1840 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1841 | break; |
1842 | default: | |
1843 | ret = -EINVAL; | |
1844 | } | |
1da177e4 LT |
1845 | |
1846 | return ret; | |
1847 | } | |
1848 | EXPORT_SYMBOL(cpufreq_unregister_notifier); | |
1849 | ||
1850 | ||
1851 | /********************************************************************* | |
1852 | * GOVERNORS * | |
1853 | *********************************************************************/ | |
1854 | ||
1c03a2d0 VK |
1855 | /* Must set freqs->new to intermediate frequency */ |
1856 | static int __target_intermediate(struct cpufreq_policy *policy, | |
1857 | struct cpufreq_freqs *freqs, int index) | |
1858 | { | |
1859 | int ret; | |
1860 | ||
1861 | freqs->new = cpufreq_driver->get_intermediate(policy, index); | |
1862 | ||
1863 | /* We don't need to switch to intermediate freq */ | |
1864 | if (!freqs->new) | |
1865 | return 0; | |
1866 | ||
1867 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", | |
1868 | __func__, policy->cpu, freqs->old, freqs->new); | |
1869 | ||
1870 | cpufreq_freq_transition_begin(policy, freqs); | |
1871 | ret = cpufreq_driver->target_intermediate(policy, index); | |
1872 | cpufreq_freq_transition_end(policy, freqs, ret); | |
1873 | ||
1874 | if (ret) | |
1875 | pr_err("%s: Failed to change to intermediate frequency: %d\n", | |
1876 | __func__, ret); | |
1877 | ||
1878 | return ret; | |
1879 | } | |
1880 | ||
8d65775d VK |
1881 | static int __target_index(struct cpufreq_policy *policy, |
1882 | struct cpufreq_frequency_table *freq_table, int index) | |
1883 | { | |
1c03a2d0 VK |
1884 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
1885 | unsigned int intermediate_freq = 0; | |
8d65775d VK |
1886 | int retval = -EINVAL; |
1887 | bool notify; | |
1888 | ||
1889 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); | |
8d65775d | 1890 | if (notify) { |
1c03a2d0 VK |
1891 | /* Handle switching to intermediate frequency */ |
1892 | if (cpufreq_driver->get_intermediate) { | |
1893 | retval = __target_intermediate(policy, &freqs, index); | |
1894 | if (retval) | |
1895 | return retval; | |
1896 | ||
1897 | intermediate_freq = freqs.new; | |
1898 | /* Set old freq to intermediate */ | |
1899 | if (intermediate_freq) | |
1900 | freqs.old = freqs.new; | |
1901 | } | |
8d65775d | 1902 | |
1c03a2d0 | 1903 | freqs.new = freq_table[index].frequency; |
8d65775d VK |
1904 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
1905 | __func__, policy->cpu, freqs.old, freqs.new); | |
1906 | ||
1907 | cpufreq_freq_transition_begin(policy, &freqs); | |
1908 | } | |
1909 | ||
1910 | retval = cpufreq_driver->target_index(policy, index); | |
1911 | if (retval) | |
1912 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, | |
1913 | retval); | |
1914 | ||
1c03a2d0 | 1915 | if (notify) { |
8d65775d VK |
1916 | cpufreq_freq_transition_end(policy, &freqs, retval); |
1917 | ||
1c03a2d0 VK |
1918 | /* |
1919 | * Failed after setting to intermediate freq? Driver should have | |
1920 | * reverted back to initial frequency and so should we. Check | |
1921 | * here for intermediate_freq instead of get_intermediate, in | |
58405af6 | 1922 | * case we haven't switched to intermediate freq at all. |
1c03a2d0 VK |
1923 | */ |
1924 | if (unlikely(retval && intermediate_freq)) { | |
1925 | freqs.old = intermediate_freq; | |
1926 | freqs.new = policy->restore_freq; | |
1927 | cpufreq_freq_transition_begin(policy, &freqs); | |
1928 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1929 | } | |
1930 | } | |
1931 | ||
8d65775d VK |
1932 | return retval; |
1933 | } | |
1934 | ||
1da177e4 LT |
1935 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
1936 | unsigned int target_freq, | |
1937 | unsigned int relation) | |
1938 | { | |
7249924e | 1939 | unsigned int old_target_freq = target_freq; |
8d65775d | 1940 | int retval = -EINVAL; |
c32b6b8e | 1941 | |
a7b422cd KRW |
1942 | if (cpufreq_disabled()) |
1943 | return -ENODEV; | |
1944 | ||
7249924e VK |
1945 | /* Make sure that target_freq is within supported range */ |
1946 | if (target_freq > policy->max) | |
1947 | target_freq = policy->max; | |
1948 | if (target_freq < policy->min) | |
1949 | target_freq = policy->min; | |
1950 | ||
1951 | pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", | |
e837f9b5 | 1952 | policy->cpu, target_freq, relation, old_target_freq); |
5a1c0228 | 1953 | |
9c0ebcf7 VK |
1954 | /* |
1955 | * This might look like a redundant call as we are checking it again | |
1956 | * after finding index. But it is left intentionally for cases where | |
1957 | * exactly same freq is called again and so we can save on few function | |
1958 | * calls. | |
1959 | */ | |
5a1c0228 VK |
1960 | if (target_freq == policy->cur) |
1961 | return 0; | |
1962 | ||
1c03a2d0 VK |
1963 | /* Save last value to restore later on errors */ |
1964 | policy->restore_freq = policy->cur; | |
1965 | ||
1c3d85dd RW |
1966 | if (cpufreq_driver->target) |
1967 | retval = cpufreq_driver->target(policy, target_freq, relation); | |
9c0ebcf7 VK |
1968 | else if (cpufreq_driver->target_index) { |
1969 | struct cpufreq_frequency_table *freq_table; | |
1970 | int index; | |
90d45d17 | 1971 | |
9c0ebcf7 VK |
1972 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
1973 | if (unlikely(!freq_table)) { | |
1974 | pr_err("%s: Unable to find freq_table\n", __func__); | |
1975 | goto out; | |
1976 | } | |
1977 | ||
1978 | retval = cpufreq_frequency_table_target(policy, freq_table, | |
1979 | target_freq, relation, &index); | |
1980 | if (unlikely(retval)) { | |
1981 | pr_err("%s: Unable to find matching freq\n", __func__); | |
1982 | goto out; | |
1983 | } | |
1984 | ||
d4019f0a | 1985 | if (freq_table[index].frequency == policy->cur) { |
9c0ebcf7 | 1986 | retval = 0; |
d4019f0a VK |
1987 | goto out; |
1988 | } | |
1989 | ||
8d65775d | 1990 | retval = __target_index(policy, freq_table, index); |
9c0ebcf7 VK |
1991 | } |
1992 | ||
1993 | out: | |
1da177e4 LT |
1994 | return retval; |
1995 | } | |
1996 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); | |
1997 | ||
1da177e4 LT |
1998 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
1999 | unsigned int target_freq, | |
2000 | unsigned int relation) | |
2001 | { | |
f1829e4a | 2002 | int ret = -EINVAL; |
1da177e4 | 2003 | |
ad7722da | 2004 | down_write(&policy->rwsem); |
1da177e4 LT |
2005 | |
2006 | ret = __cpufreq_driver_target(policy, target_freq, relation); | |
2007 | ||
ad7722da | 2008 | up_write(&policy->rwsem); |
1da177e4 | 2009 | |
1da177e4 LT |
2010 | return ret; |
2011 | } | |
2012 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); | |
2013 | ||
e08f5f5b GS |
2014 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
2015 | unsigned int event) | |
1da177e4 | 2016 | { |
cc993cab | 2017 | int ret; |
6afde10c TR |
2018 | |
2019 | /* Only must be defined when default governor is known to have latency | |
2020 | restrictions, like e.g. conservative or ondemand. | |
2021 | That this is the case is already ensured in Kconfig | |
2022 | */ | |
2023 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE | |
2024 | struct cpufreq_governor *gov = &cpufreq_gov_performance; | |
2025 | #else | |
2026 | struct cpufreq_governor *gov = NULL; | |
2027 | #endif | |
1c256245 | 2028 | |
2f0aea93 VK |
2029 | /* Don't start any governor operations if we are entering suspend */ |
2030 | if (cpufreq_suspended) | |
2031 | return 0; | |
cb57720b EZ |
2032 | /* |
2033 | * Governor might not be initiated here if ACPI _PPC changed | |
2034 | * notification happened, so check it. | |
2035 | */ | |
2036 | if (!policy->governor) | |
2037 | return -EINVAL; | |
2f0aea93 | 2038 | |
1c256245 TR |
2039 | if (policy->governor->max_transition_latency && |
2040 | policy->cpuinfo.transition_latency > | |
2041 | policy->governor->max_transition_latency) { | |
6afde10c TR |
2042 | if (!gov) |
2043 | return -EINVAL; | |
2044 | else { | |
e837f9b5 JP |
2045 | pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", |
2046 | policy->governor->name, gov->name); | |
6afde10c TR |
2047 | policy->governor = gov; |
2048 | } | |
1c256245 | 2049 | } |
1da177e4 | 2050 | |
fe492f3f VK |
2051 | if (event == CPUFREQ_GOV_POLICY_INIT) |
2052 | if (!try_module_get(policy->governor->owner)) | |
2053 | return -EINVAL; | |
1da177e4 | 2054 | |
2d06d8c4 | 2055 | pr_debug("__cpufreq_governor for CPU %u, event %u\n", |
e837f9b5 | 2056 | policy->cpu, event); |
95731ebb XC |
2057 | |
2058 | mutex_lock(&cpufreq_governor_lock); | |
56d07db2 | 2059 | if ((policy->governor_enabled && event == CPUFREQ_GOV_START) |
f73d3933 VK |
2060 | || (!policy->governor_enabled |
2061 | && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { | |
95731ebb XC |
2062 | mutex_unlock(&cpufreq_governor_lock); |
2063 | return -EBUSY; | |
2064 | } | |
2065 | ||
2066 | if (event == CPUFREQ_GOV_STOP) | |
2067 | policy->governor_enabled = false; | |
2068 | else if (event == CPUFREQ_GOV_START) | |
2069 | policy->governor_enabled = true; | |
2070 | ||
2071 | mutex_unlock(&cpufreq_governor_lock); | |
2072 | ||
1da177e4 LT |
2073 | ret = policy->governor->governor(policy, event); |
2074 | ||
4d5dcc42 VK |
2075 | if (!ret) { |
2076 | if (event == CPUFREQ_GOV_POLICY_INIT) | |
2077 | policy->governor->initialized++; | |
2078 | else if (event == CPUFREQ_GOV_POLICY_EXIT) | |
2079 | policy->governor->initialized--; | |
95731ebb XC |
2080 | } else { |
2081 | /* Restore original values */ | |
2082 | mutex_lock(&cpufreq_governor_lock); | |
2083 | if (event == CPUFREQ_GOV_STOP) | |
2084 | policy->governor_enabled = true; | |
2085 | else if (event == CPUFREQ_GOV_START) | |
2086 | policy->governor_enabled = false; | |
2087 | mutex_unlock(&cpufreq_governor_lock); | |
4d5dcc42 | 2088 | } |
b394058f | 2089 | |
fe492f3f VK |
2090 | if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || |
2091 | ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret)) | |
1da177e4 LT |
2092 | module_put(policy->governor->owner); |
2093 | ||
2094 | return ret; | |
2095 | } | |
2096 | ||
1da177e4 LT |
2097 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
2098 | { | |
3bcb09a3 | 2099 | int err; |
1da177e4 LT |
2100 | |
2101 | if (!governor) | |
2102 | return -EINVAL; | |
2103 | ||
a7b422cd KRW |
2104 | if (cpufreq_disabled()) |
2105 | return -ENODEV; | |
2106 | ||
3fc54d37 | 2107 | mutex_lock(&cpufreq_governor_mutex); |
32ee8c3e | 2108 | |
b394058f | 2109 | governor->initialized = 0; |
3bcb09a3 | 2110 | err = -EBUSY; |
42f91fa1 | 2111 | if (!find_governor(governor->name)) { |
3bcb09a3 JF |
2112 | err = 0; |
2113 | list_add(&governor->governor_list, &cpufreq_governor_list); | |
1da177e4 | 2114 | } |
1da177e4 | 2115 | |
32ee8c3e | 2116 | mutex_unlock(&cpufreq_governor_mutex); |
3bcb09a3 | 2117 | return err; |
1da177e4 LT |
2118 | } |
2119 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); | |
2120 | ||
1da177e4 LT |
2121 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
2122 | { | |
4573237b VK |
2123 | struct cpufreq_policy *policy; |
2124 | unsigned long flags; | |
90e41bac | 2125 | |
1da177e4 LT |
2126 | if (!governor) |
2127 | return; | |
2128 | ||
a7b422cd KRW |
2129 | if (cpufreq_disabled()) |
2130 | return; | |
2131 | ||
4573237b VK |
2132 | /* clear last_governor for all inactive policies */ |
2133 | read_lock_irqsave(&cpufreq_driver_lock, flags); | |
2134 | for_each_inactive_policy(policy) { | |
18bf3a12 VK |
2135 | if (!strcmp(policy->last_governor, governor->name)) { |
2136 | policy->governor = NULL; | |
4573237b | 2137 | strcpy(policy->last_governor, "\0"); |
18bf3a12 | 2138 | } |
90e41bac | 2139 | } |
4573237b | 2140 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
90e41bac | 2141 | |
3fc54d37 | 2142 | mutex_lock(&cpufreq_governor_mutex); |
1da177e4 | 2143 | list_del(&governor->governor_list); |
3fc54d37 | 2144 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 LT |
2145 | return; |
2146 | } | |
2147 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); | |
2148 | ||
2149 | ||
1da177e4 LT |
2150 | /********************************************************************* |
2151 | * POLICY INTERFACE * | |
2152 | *********************************************************************/ | |
2153 | ||
2154 | /** | |
2155 | * cpufreq_get_policy - get the current cpufreq_policy | |
29464f28 DJ |
2156 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
2157 | * is written | |
1da177e4 LT |
2158 | * |
2159 | * Reads the current cpufreq policy. | |
2160 | */ | |
2161 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) | |
2162 | { | |
2163 | struct cpufreq_policy *cpu_policy; | |
2164 | if (!policy) | |
2165 | return -EINVAL; | |
2166 | ||
2167 | cpu_policy = cpufreq_cpu_get(cpu); | |
2168 | if (!cpu_policy) | |
2169 | return -EINVAL; | |
2170 | ||
d5b73cd8 | 2171 | memcpy(policy, cpu_policy, sizeof(*policy)); |
1da177e4 LT |
2172 | |
2173 | cpufreq_cpu_put(cpu_policy); | |
1da177e4 LT |
2174 | return 0; |
2175 | } | |
2176 | EXPORT_SYMBOL(cpufreq_get_policy); | |
2177 | ||
153d7f3f | 2178 | /* |
037ce839 VK |
2179 | * policy : current policy. |
2180 | * new_policy: policy to be set. | |
153d7f3f | 2181 | */ |
037ce839 | 2182 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 2183 | struct cpufreq_policy *new_policy) |
1da177e4 | 2184 | { |
d9a789c7 RW |
2185 | struct cpufreq_governor *old_gov; |
2186 | int ret; | |
1da177e4 | 2187 | |
e837f9b5 JP |
2188 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
2189 | new_policy->cpu, new_policy->min, new_policy->max); | |
1da177e4 | 2190 | |
d5b73cd8 | 2191 | memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
1da177e4 | 2192 | |
fba9573b PX |
2193 | /* |
2194 | * This check works well when we store new min/max freq attributes, | |
2195 | * because new_policy is a copy of policy with one field updated. | |
2196 | */ | |
2197 | if (new_policy->min > new_policy->max) | |
d9a789c7 | 2198 | return -EINVAL; |
9c9a43ed | 2199 | |
1da177e4 | 2200 | /* verify the cpu speed can be set within this limit */ |
3a3e9e06 | 2201 | ret = cpufreq_driver->verify(new_policy); |
1da177e4 | 2202 | if (ret) |
d9a789c7 | 2203 | return ret; |
1da177e4 | 2204 | |
1da177e4 | 2205 | /* adjust if necessary - all reasons */ |
e041c683 | 2206 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2207 | CPUFREQ_ADJUST, new_policy); |
1da177e4 LT |
2208 | |
2209 | /* adjust if necessary - hardware incompatibility*/ | |
e041c683 | 2210 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2211 | CPUFREQ_INCOMPATIBLE, new_policy); |
1da177e4 | 2212 | |
bb176f7d VK |
2213 | /* |
2214 | * verify the cpu speed can be set within this limit, which might be | |
2215 | * different to the first one | |
2216 | */ | |
3a3e9e06 | 2217 | ret = cpufreq_driver->verify(new_policy); |
e041c683 | 2218 | if (ret) |
d9a789c7 | 2219 | return ret; |
1da177e4 LT |
2220 | |
2221 | /* notification of the new policy */ | |
e041c683 | 2222 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2223 | CPUFREQ_NOTIFY, new_policy); |
1da177e4 | 2224 | |
3a3e9e06 VK |
2225 | policy->min = new_policy->min; |
2226 | policy->max = new_policy->max; | |
1da177e4 | 2227 | |
2d06d8c4 | 2228 | pr_debug("new min and max freqs are %u - %u kHz\n", |
e837f9b5 | 2229 | policy->min, policy->max); |
1da177e4 | 2230 | |
1c3d85dd | 2231 | if (cpufreq_driver->setpolicy) { |
3a3e9e06 | 2232 | policy->policy = new_policy->policy; |
2d06d8c4 | 2233 | pr_debug("setting range\n"); |
d9a789c7 RW |
2234 | return cpufreq_driver->setpolicy(new_policy); |
2235 | } | |
1da177e4 | 2236 | |
d9a789c7 RW |
2237 | if (new_policy->governor == policy->governor) |
2238 | goto out; | |
7bd353a9 | 2239 | |
d9a789c7 RW |
2240 | pr_debug("governor switch\n"); |
2241 | ||
2242 | /* save old, working values */ | |
2243 | old_gov = policy->governor; | |
2244 | /* end old governor */ | |
2245 | if (old_gov) { | |
4bc384ae VK |
2246 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
2247 | if (ret) { | |
2248 | /* This can happen due to race with other operations */ | |
2249 | pr_debug("%s: Failed to Stop Governor: %s (%d)\n", | |
2250 | __func__, old_gov->name, ret); | |
2251 | return ret; | |
2252 | } | |
2253 | ||
d9a789c7 | 2254 | up_write(&policy->rwsem); |
4bc384ae | 2255 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
d9a789c7 | 2256 | down_write(&policy->rwsem); |
4bc384ae VK |
2257 | |
2258 | if (ret) { | |
2259 | pr_err("%s: Failed to Exit Governor: %s (%d)\n", | |
2260 | __func__, old_gov->name, ret); | |
2261 | return ret; | |
2262 | } | |
1da177e4 LT |
2263 | } |
2264 | ||
d9a789c7 RW |
2265 | /* start new governor */ |
2266 | policy->governor = new_policy->governor; | |
4bc384ae VK |
2267 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); |
2268 | if (!ret) { | |
2269 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
2270 | if (!ret) | |
d9a789c7 RW |
2271 | goto out; |
2272 | ||
2273 | up_write(&policy->rwsem); | |
2274 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); | |
2275 | down_write(&policy->rwsem); | |
2276 | } | |
2277 | ||
2278 | /* new governor failed, so re-start old one */ | |
2279 | pr_debug("starting governor %s failed\n", policy->governor->name); | |
2280 | if (old_gov) { | |
2281 | policy->governor = old_gov; | |
4bc384ae VK |
2282 | if (__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) |
2283 | policy->governor = NULL; | |
2284 | else | |
2285 | __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
d9a789c7 RW |
2286 | } |
2287 | ||
4bc384ae | 2288 | return ret; |
d9a789c7 RW |
2289 | |
2290 | out: | |
2291 | pr_debug("governor: change or update limits\n"); | |
2292 | return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1da177e4 LT |
2293 | } |
2294 | ||
1da177e4 LT |
2295 | /** |
2296 | * cpufreq_update_policy - re-evaluate an existing cpufreq policy | |
2297 | * @cpu: CPU which shall be re-evaluated | |
2298 | * | |
25985edc | 2299 | * Useful for policy notifiers which have different necessities |
1da177e4 LT |
2300 | * at different times. |
2301 | */ | |
2302 | int cpufreq_update_policy(unsigned int cpu) | |
2303 | { | |
3a3e9e06 VK |
2304 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
2305 | struct cpufreq_policy new_policy; | |
f1829e4a | 2306 | int ret; |
1da177e4 | 2307 | |
fefa8ff8 AP |
2308 | if (!policy) |
2309 | return -ENODEV; | |
1da177e4 | 2310 | |
ad7722da | 2311 | down_write(&policy->rwsem); |
1da177e4 | 2312 | |
2d06d8c4 | 2313 | pr_debug("updating policy for CPU %u\n", cpu); |
d5b73cd8 | 2314 | memcpy(&new_policy, policy, sizeof(*policy)); |
3a3e9e06 VK |
2315 | new_policy.min = policy->user_policy.min; |
2316 | new_policy.max = policy->user_policy.max; | |
2317 | new_policy.policy = policy->user_policy.policy; | |
2318 | new_policy.governor = policy->user_policy.governor; | |
1da177e4 | 2319 | |
bb176f7d VK |
2320 | /* |
2321 | * BIOS might change freq behind our back | |
2322 | * -> ask driver for current freq and notify governors about a change | |
2323 | */ | |
2ed99e39 | 2324 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
3a3e9e06 | 2325 | new_policy.cur = cpufreq_driver->get(cpu); |
bd0fa9bb VK |
2326 | if (WARN_ON(!new_policy.cur)) { |
2327 | ret = -EIO; | |
fefa8ff8 | 2328 | goto unlock; |
bd0fa9bb VK |
2329 | } |
2330 | ||
3a3e9e06 | 2331 | if (!policy->cur) { |
e837f9b5 | 2332 | pr_debug("Driver did not initialize current freq\n"); |
3a3e9e06 | 2333 | policy->cur = new_policy.cur; |
a85f7bd3 | 2334 | } else { |
9c0ebcf7 | 2335 | if (policy->cur != new_policy.cur && has_target()) |
a1e1dc41 | 2336 | cpufreq_out_of_sync(policy, new_policy.cur); |
a85f7bd3 | 2337 | } |
0961dd0d TR |
2338 | } |
2339 | ||
037ce839 | 2340 | ret = cpufreq_set_policy(policy, &new_policy); |
1da177e4 | 2341 | |
fefa8ff8 | 2342 | unlock: |
ad7722da | 2343 | up_write(&policy->rwsem); |
5a01f2e8 | 2344 | |
3a3e9e06 | 2345 | cpufreq_cpu_put(policy); |
1da177e4 LT |
2346 | return ret; |
2347 | } | |
2348 | EXPORT_SYMBOL(cpufreq_update_policy); | |
2349 | ||
2760984f | 2350 | static int cpufreq_cpu_callback(struct notifier_block *nfb, |
c32b6b8e AR |
2351 | unsigned long action, void *hcpu) |
2352 | { | |
2353 | unsigned int cpu = (unsigned long)hcpu; | |
c32b6b8e | 2354 | |
0b275352 RW |
2355 | switch (action & ~CPU_TASKS_FROZEN) { |
2356 | case CPU_ONLINE: | |
2357 | cpufreq_online(cpu); | |
2358 | break; | |
5302c3fb | 2359 | |
0b275352 RW |
2360 | case CPU_DOWN_PREPARE: |
2361 | cpufreq_offline_prepare(cpu); | |
2362 | break; | |
1aee40ac | 2363 | |
0b275352 RW |
2364 | case CPU_POST_DEAD: |
2365 | cpufreq_offline_finish(cpu); | |
2366 | break; | |
5302c3fb | 2367 | |
0b275352 RW |
2368 | case CPU_DOWN_FAILED: |
2369 | cpufreq_online(cpu); | |
2370 | break; | |
c32b6b8e AR |
2371 | } |
2372 | return NOTIFY_OK; | |
2373 | } | |
2374 | ||
9c36f746 | 2375 | static struct notifier_block __refdata cpufreq_cpu_notifier = { |
bb176f7d | 2376 | .notifier_call = cpufreq_cpu_callback, |
c32b6b8e | 2377 | }; |
1da177e4 | 2378 | |
6f19efc0 LM |
2379 | /********************************************************************* |
2380 | * BOOST * | |
2381 | *********************************************************************/ | |
2382 | static int cpufreq_boost_set_sw(int state) | |
2383 | { | |
2384 | struct cpufreq_frequency_table *freq_table; | |
2385 | struct cpufreq_policy *policy; | |
2386 | int ret = -EINVAL; | |
2387 | ||
f963735a | 2388 | for_each_active_policy(policy) { |
6f19efc0 LM |
2389 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
2390 | if (freq_table) { | |
2391 | ret = cpufreq_frequency_table_cpuinfo(policy, | |
2392 | freq_table); | |
2393 | if (ret) { | |
2394 | pr_err("%s: Policy frequency update failed\n", | |
2395 | __func__); | |
2396 | break; | |
2397 | } | |
2398 | policy->user_policy.max = policy->max; | |
2399 | __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
2400 | } | |
2401 | } | |
2402 | ||
2403 | return ret; | |
2404 | } | |
2405 | ||
2406 | int cpufreq_boost_trigger_state(int state) | |
2407 | { | |
2408 | unsigned long flags; | |
2409 | int ret = 0; | |
2410 | ||
2411 | if (cpufreq_driver->boost_enabled == state) | |
2412 | return 0; | |
2413 | ||
2414 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2415 | cpufreq_driver->boost_enabled = state; | |
2416 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2417 | ||
2418 | ret = cpufreq_driver->set_boost(state); | |
2419 | if (ret) { | |
2420 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2421 | cpufreq_driver->boost_enabled = !state; | |
2422 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2423 | ||
e837f9b5 JP |
2424 | pr_err("%s: Cannot %s BOOST\n", |
2425 | __func__, state ? "enable" : "disable"); | |
6f19efc0 LM |
2426 | } |
2427 | ||
2428 | return ret; | |
2429 | } | |
2430 | ||
2431 | int cpufreq_boost_supported(void) | |
2432 | { | |
2433 | if (likely(cpufreq_driver)) | |
2434 | return cpufreq_driver->boost_supported; | |
2435 | ||
2436 | return 0; | |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(cpufreq_boost_supported); | |
2439 | ||
2440 | int cpufreq_boost_enabled(void) | |
2441 | { | |
2442 | return cpufreq_driver->boost_enabled; | |
2443 | } | |
2444 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); | |
2445 | ||
1da177e4 LT |
2446 | /********************************************************************* |
2447 | * REGISTER / UNREGISTER CPUFREQ DRIVER * | |
2448 | *********************************************************************/ | |
2449 | ||
2450 | /** | |
2451 | * cpufreq_register_driver - register a CPU Frequency driver | |
2452 | * @driver_data: A struct cpufreq_driver containing the values# | |
2453 | * submitted by the CPU Frequency driver. | |
2454 | * | |
bb176f7d | 2455 | * Registers a CPU Frequency driver to this core code. This code |
1da177e4 | 2456 | * returns zero on success, -EBUSY when another driver got here first |
32ee8c3e | 2457 | * (and isn't unregistered in the meantime). |
1da177e4 LT |
2458 | * |
2459 | */ | |
221dee28 | 2460 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
1da177e4 LT |
2461 | { |
2462 | unsigned long flags; | |
2463 | int ret; | |
2464 | ||
a7b422cd KRW |
2465 | if (cpufreq_disabled()) |
2466 | return -ENODEV; | |
2467 | ||
1da177e4 | 2468 | if (!driver_data || !driver_data->verify || !driver_data->init || |
9c0ebcf7 | 2469 | !(driver_data->setpolicy || driver_data->target_index || |
9832235f RW |
2470 | driver_data->target) || |
2471 | (driver_data->setpolicy && (driver_data->target_index || | |
1c03a2d0 VK |
2472 | driver_data->target)) || |
2473 | (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) | |
1da177e4 LT |
2474 | return -EINVAL; |
2475 | ||
2d06d8c4 | 2476 | pr_debug("trying to register driver %s\n", driver_data->name); |
1da177e4 | 2477 | |
fdd320da RW |
2478 | /* Protect against concurrent CPU online/offline. */ |
2479 | get_online_cpus(); | |
2480 | ||
0d1857a1 | 2481 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2482 | if (cpufreq_driver) { |
0d1857a1 | 2483 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
fdd320da RW |
2484 | ret = -EEXIST; |
2485 | goto out; | |
1da177e4 | 2486 | } |
1c3d85dd | 2487 | cpufreq_driver = driver_data; |
0d1857a1 | 2488 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 2489 | |
bc68b7df VK |
2490 | if (driver_data->setpolicy) |
2491 | driver_data->flags |= CPUFREQ_CONST_LOOPS; | |
2492 | ||
6f19efc0 LM |
2493 | if (cpufreq_boost_supported()) { |
2494 | /* | |
2495 | * Check if driver provides function to enable boost - | |
2496 | * if not, use cpufreq_boost_set_sw as default | |
2497 | */ | |
2498 | if (!cpufreq_driver->set_boost) | |
2499 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; | |
2500 | ||
2501 | ret = cpufreq_sysfs_create_file(&boost.attr); | |
2502 | if (ret) { | |
2503 | pr_err("%s: cannot register global BOOST sysfs file\n", | |
e837f9b5 | 2504 | __func__); |
6f19efc0 LM |
2505 | goto err_null_driver; |
2506 | } | |
2507 | } | |
2508 | ||
8a25a2fd | 2509 | ret = subsys_interface_register(&cpufreq_interface); |
8f5bc2ab | 2510 | if (ret) |
6f19efc0 | 2511 | goto err_boost_unreg; |
1da177e4 | 2512 | |
ce1bcfe9 VK |
2513 | if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && |
2514 | list_empty(&cpufreq_policy_list)) { | |
1da177e4 | 2515 | /* if all ->init() calls failed, unregister */ |
ce1bcfe9 VK |
2516 | pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
2517 | driver_data->name); | |
2518 | goto err_if_unreg; | |
1da177e4 LT |
2519 | } |
2520 | ||
8f5bc2ab | 2521 | register_hotcpu_notifier(&cpufreq_cpu_notifier); |
2d06d8c4 | 2522 | pr_debug("driver %s up and running\n", driver_data->name); |
1da177e4 | 2523 | |
fdd320da RW |
2524 | out: |
2525 | put_online_cpus(); | |
2526 | return ret; | |
2527 | ||
8a25a2fd KS |
2528 | err_if_unreg: |
2529 | subsys_interface_unregister(&cpufreq_interface); | |
6f19efc0 LM |
2530 | err_boost_unreg: |
2531 | if (cpufreq_boost_supported()) | |
2532 | cpufreq_sysfs_remove_file(&boost.attr); | |
8f5bc2ab | 2533 | err_null_driver: |
0d1857a1 | 2534 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2535 | cpufreq_driver = NULL; |
0d1857a1 | 2536 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
fdd320da | 2537 | goto out; |
1da177e4 LT |
2538 | } |
2539 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); | |
2540 | ||
1da177e4 LT |
2541 | /** |
2542 | * cpufreq_unregister_driver - unregister the current CPUFreq driver | |
2543 | * | |
bb176f7d | 2544 | * Unregister the current CPUFreq driver. Only call this if you have |
1da177e4 LT |
2545 | * the right to do so, i.e. if you have succeeded in initialising before! |
2546 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is | |
2547 | * currently not initialised. | |
2548 | */ | |
221dee28 | 2549 | int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
1da177e4 LT |
2550 | { |
2551 | unsigned long flags; | |
2552 | ||
1c3d85dd | 2553 | if (!cpufreq_driver || (driver != cpufreq_driver)) |
1da177e4 | 2554 | return -EINVAL; |
1da177e4 | 2555 | |
2d06d8c4 | 2556 | pr_debug("unregistering driver %s\n", driver->name); |
1da177e4 | 2557 | |
454d3a25 SAS |
2558 | /* Protect against concurrent cpu hotplug */ |
2559 | get_online_cpus(); | |
8a25a2fd | 2560 | subsys_interface_unregister(&cpufreq_interface); |
6f19efc0 LM |
2561 | if (cpufreq_boost_supported()) |
2562 | cpufreq_sysfs_remove_file(&boost.attr); | |
2563 | ||
65edc68c | 2564 | unregister_hotcpu_notifier(&cpufreq_cpu_notifier); |
1da177e4 | 2565 | |
0d1857a1 | 2566 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
6eed9404 | 2567 | |
1c3d85dd | 2568 | cpufreq_driver = NULL; |
6eed9404 | 2569 | |
0d1857a1 | 2570 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
454d3a25 | 2571 | put_online_cpus(); |
1da177e4 LT |
2572 | |
2573 | return 0; | |
2574 | } | |
2575 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); | |
5a01f2e8 | 2576 | |
90de2a4a DA |
2577 | /* |
2578 | * Stop cpufreq at shutdown to make sure it isn't holding any locks | |
2579 | * or mutexes when secondary CPUs are halted. | |
2580 | */ | |
2581 | static struct syscore_ops cpufreq_syscore_ops = { | |
2582 | .shutdown = cpufreq_suspend, | |
2583 | }; | |
2584 | ||
5a01f2e8 VP |
2585 | static int __init cpufreq_core_init(void) |
2586 | { | |
a7b422cd KRW |
2587 | if (cpufreq_disabled()) |
2588 | return -ENODEV; | |
2589 | ||
2361be23 | 2590 | cpufreq_global_kobject = kobject_create(); |
8aa84ad8 TR |
2591 | BUG_ON(!cpufreq_global_kobject); |
2592 | ||
90de2a4a DA |
2593 | register_syscore_ops(&cpufreq_syscore_ops); |
2594 | ||
5a01f2e8 VP |
2595 | return 0; |
2596 | } | |
5a01f2e8 | 2597 | core_initcall(cpufreq_core_init); |