Commit | Line | Data |
---|---|---|
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 | |
084f3493 | 107 | /* This one keeps track of the previously set governor of a removed CPU */ |
e77b89f1 | 108 | static DEFINE_PER_CPU(char[CPUFREQ_NAME_LEN], cpufreq_cpu_governor); |
1da177e4 | 109 | |
2f0aea93 VK |
110 | /* Flag to suspend/resume CPUFreq governors */ |
111 | static bool cpufreq_suspended; | |
1da177e4 | 112 | |
9c0ebcf7 VK |
113 | static inline bool has_target(void) |
114 | { | |
115 | return cpufreq_driver->target_index || cpufreq_driver->target; | |
116 | } | |
117 | ||
6eed9404 VK |
118 | /* |
119 | * rwsem to guarantee that cpufreq driver module doesn't unload during critical | |
120 | * sections | |
121 | */ | |
122 | static DECLARE_RWSEM(cpufreq_rwsem); | |
123 | ||
1da177e4 | 124 | /* internal prototypes */ |
29464f28 DJ |
125 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
126 | unsigned int event); | |
d92d50a4 | 127 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
65f27f38 | 128 | static void handle_update(struct work_struct *work); |
1da177e4 LT |
129 | |
130 | /** | |
32ee8c3e DJ |
131 | * Two notifier lists: the "policy" list is involved in the |
132 | * validation process for a new CPU frequency policy; the | |
1da177e4 LT |
133 | * "transition" list for kernel code that needs to handle |
134 | * changes to devices when the CPU clock speed changes. | |
135 | * The mutex locks both lists. | |
136 | */ | |
e041c683 | 137 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
b4dfdbb3 | 138 | static struct srcu_notifier_head cpufreq_transition_notifier_list; |
1da177e4 | 139 | |
74212ca4 | 140 | static bool init_cpufreq_transition_notifier_list_called; |
b4dfdbb3 AS |
141 | static int __init init_cpufreq_transition_notifier_list(void) |
142 | { | |
143 | srcu_init_notifier_head(&cpufreq_transition_notifier_list); | |
74212ca4 | 144 | init_cpufreq_transition_notifier_list_called = true; |
b4dfdbb3 AS |
145 | return 0; |
146 | } | |
b3438f82 | 147 | pure_initcall(init_cpufreq_transition_notifier_list); |
1da177e4 | 148 | |
a7b422cd | 149 | static int off __read_mostly; |
da584455 | 150 | static int cpufreq_disabled(void) |
a7b422cd KRW |
151 | { |
152 | return off; | |
153 | } | |
154 | void disable_cpufreq(void) | |
155 | { | |
156 | off = 1; | |
157 | } | |
29464f28 | 158 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
1da177e4 | 159 | |
4d5dcc42 VK |
160 | bool have_governor_per_policy(void) |
161 | { | |
0b981e70 | 162 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
4d5dcc42 | 163 | } |
3f869d6d | 164 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
4d5dcc42 | 165 | |
944e9a03 VK |
166 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
167 | { | |
168 | if (have_governor_per_policy()) | |
169 | return &policy->kobj; | |
170 | else | |
171 | return cpufreq_global_kobject; | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); | |
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 | /* | |
232 | * The driver only supports the SMP configuartion where all processors | |
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 | * | |
274 | * It also takes a read-lock of 'cpufreq_rwsem' and doesn't put it back if a | |
275 | * valid policy is found. This is done to make sure the driver doesn't get | |
276 | * unregistered while the policy is being used. | |
277 | * | |
278 | * Return: A valid policy on success, otherwise NULL on failure. | |
279 | */ | |
6eed9404 | 280 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
1da177e4 | 281 | { |
6eed9404 | 282 | struct cpufreq_policy *policy = NULL; |
1da177e4 LT |
283 | unsigned long flags; |
284 | ||
1b947c90 | 285 | if (WARN_ON(cpu >= nr_cpu_ids)) |
6eed9404 VK |
286 | return NULL; |
287 | ||
288 | if (!down_read_trylock(&cpufreq_rwsem)) | |
289 | return NULL; | |
1da177e4 LT |
290 | |
291 | /* get the cpufreq driver */ | |
1c3d85dd | 292 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
1da177e4 | 293 | |
6eed9404 VK |
294 | if (cpufreq_driver) { |
295 | /* get the CPU */ | |
988bed09 | 296 | policy = cpufreq_cpu_get_raw(cpu); |
6eed9404 VK |
297 | if (policy) |
298 | kobject_get(&policy->kobj); | |
299 | } | |
1da177e4 | 300 | |
6eed9404 | 301 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 302 | |
3a3e9e06 | 303 | if (!policy) |
6eed9404 | 304 | up_read(&cpufreq_rwsem); |
1da177e4 | 305 | |
3a3e9e06 | 306 | return policy; |
a9144436 | 307 | } |
1da177e4 LT |
308 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
309 | ||
50e9c852 VK |
310 | /** |
311 | * cpufreq_cpu_put: Decrements the usage count of a policy | |
312 | * | |
313 | * @policy: policy earlier returned by cpufreq_cpu_get(). | |
314 | * | |
315 | * This decrements the kobject reference count incremented earlier by calling | |
316 | * cpufreq_cpu_get(). | |
317 | * | |
318 | * It also drops the read-lock of 'cpufreq_rwsem' taken at cpufreq_cpu_get(). | |
319 | */ | |
3a3e9e06 | 320 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
1da177e4 | 321 | { |
6eed9404 VK |
322 | kobject_put(&policy->kobj); |
323 | up_read(&cpufreq_rwsem); | |
1da177e4 LT |
324 | } |
325 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); | |
326 | ||
1da177e4 LT |
327 | /********************************************************************* |
328 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * | |
329 | *********************************************************************/ | |
330 | ||
331 | /** | |
332 | * adjust_jiffies - adjust the system "loops_per_jiffy" | |
333 | * | |
334 | * This function alters the system "loops_per_jiffy" for the clock | |
335 | * speed change. Note that loops_per_jiffy cannot be updated on SMP | |
32ee8c3e | 336 | * systems as each CPU might be scaled differently. So, use the arch |
1da177e4 LT |
337 | * per-CPU loops_per_jiffy value wherever possible. |
338 | */ | |
858119e1 | 339 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
1da177e4 | 340 | { |
39c132ee VK |
341 | #ifndef CONFIG_SMP |
342 | static unsigned long l_p_j_ref; | |
343 | static unsigned int l_p_j_ref_freq; | |
344 | ||
1da177e4 LT |
345 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
346 | return; | |
347 | ||
348 | if (!l_p_j_ref_freq) { | |
349 | l_p_j_ref = loops_per_jiffy; | |
350 | l_p_j_ref_freq = ci->old; | |
e837f9b5 JP |
351 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
352 | l_p_j_ref, l_p_j_ref_freq); | |
1da177e4 | 353 | } |
0b443ead | 354 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
e08f5f5b GS |
355 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
356 | ci->new); | |
e837f9b5 JP |
357 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
358 | loops_per_jiffy, ci->new); | |
1da177e4 | 359 | } |
1da177e4 | 360 | #endif |
39c132ee | 361 | } |
1da177e4 | 362 | |
0956df9c | 363 | static void __cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb | 364 | struct cpufreq_freqs *freqs, unsigned int state) |
1da177e4 LT |
365 | { |
366 | BUG_ON(irqs_disabled()); | |
367 | ||
d5aaffa9 DB |
368 | if (cpufreq_disabled()) |
369 | return; | |
370 | ||
1c3d85dd | 371 | freqs->flags = cpufreq_driver->flags; |
2d06d8c4 | 372 | pr_debug("notification %u of frequency transition to %u kHz\n", |
e837f9b5 | 373 | state, freqs->new); |
1da177e4 | 374 | |
1da177e4 | 375 | switch (state) { |
e4472cb3 | 376 | |
1da177e4 | 377 | case CPUFREQ_PRECHANGE: |
32ee8c3e | 378 | /* detect if the driver reported a value as "old frequency" |
e4472cb3 DJ |
379 | * which is not equal to what the cpufreq core thinks is |
380 | * "old frequency". | |
1da177e4 | 381 | */ |
1c3d85dd | 382 | if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e4472cb3 DJ |
383 | if ((policy) && (policy->cpu == freqs->cpu) && |
384 | (policy->cur) && (policy->cur != freqs->old)) { | |
e837f9b5 JP |
385 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
386 | freqs->old, policy->cur); | |
e4472cb3 | 387 | freqs->old = policy->cur; |
1da177e4 LT |
388 | } |
389 | } | |
b4dfdbb3 | 390 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 391 | CPUFREQ_PRECHANGE, freqs); |
1da177e4 LT |
392 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
393 | break; | |
e4472cb3 | 394 | |
1da177e4 LT |
395 | case CPUFREQ_POSTCHANGE: |
396 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); | |
e837f9b5 JP |
397 | pr_debug("FREQ: %lu - CPU: %lu\n", |
398 | (unsigned long)freqs->new, (unsigned long)freqs->cpu); | |
25e41933 | 399 | trace_cpu_frequency(freqs->new, freqs->cpu); |
b4dfdbb3 | 400 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 401 | CPUFREQ_POSTCHANGE, freqs); |
e4472cb3 DJ |
402 | if (likely(policy) && likely(policy->cpu == freqs->cpu)) |
403 | policy->cur = freqs->new; | |
1da177e4 LT |
404 | break; |
405 | } | |
1da177e4 | 406 | } |
bb176f7d | 407 | |
b43a7ffb VK |
408 | /** |
409 | * cpufreq_notify_transition - call notifier chain and adjust_jiffies | |
410 | * on frequency transition. | |
411 | * | |
412 | * This function calls the transition notifiers and the "adjust_jiffies" | |
413 | * function. It is called twice on all CPU frequency changes that have | |
414 | * external effects. | |
415 | */ | |
236a9800 | 416 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb VK |
417 | struct cpufreq_freqs *freqs, unsigned int state) |
418 | { | |
419 | for_each_cpu(freqs->cpu, policy->cpus) | |
420 | __cpufreq_notify_transition(policy, freqs, state); | |
421 | } | |
1da177e4 | 422 | |
f7ba3b41 | 423 | /* Do post notifications when there are chances that transition has failed */ |
236a9800 | 424 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
f7ba3b41 VK |
425 | struct cpufreq_freqs *freqs, int transition_failed) |
426 | { | |
427 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
428 | if (!transition_failed) | |
429 | return; | |
430 | ||
431 | swap(freqs->old, freqs->new); | |
432 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
433 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
434 | } | |
f7ba3b41 | 435 | |
12478cf0 SB |
436 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
437 | struct cpufreq_freqs *freqs) | |
438 | { | |
ca654dc3 SB |
439 | |
440 | /* | |
441 | * Catch double invocations of _begin() which lead to self-deadlock. | |
442 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core | |
443 | * doesn't invoke _begin() on their behalf, and hence the chances of | |
444 | * double invocations are very low. Moreover, there are scenarios | |
445 | * where these checks can emit false-positive warnings in these | |
446 | * drivers; so we avoid that by skipping them altogether. | |
447 | */ | |
448 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) | |
449 | && current == policy->transition_task); | |
450 | ||
12478cf0 SB |
451 | wait: |
452 | wait_event(policy->transition_wait, !policy->transition_ongoing); | |
453 | ||
454 | spin_lock(&policy->transition_lock); | |
455 | ||
456 | if (unlikely(policy->transition_ongoing)) { | |
457 | spin_unlock(&policy->transition_lock); | |
458 | goto wait; | |
459 | } | |
460 | ||
461 | policy->transition_ongoing = true; | |
ca654dc3 | 462 | policy->transition_task = current; |
12478cf0 SB |
463 | |
464 | spin_unlock(&policy->transition_lock); | |
465 | ||
466 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); | |
469 | ||
470 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
471 | struct cpufreq_freqs *freqs, int transition_failed) | |
472 | { | |
473 | if (unlikely(WARN_ON(!policy->transition_ongoing))) | |
474 | return; | |
475 | ||
476 | cpufreq_notify_post_transition(policy, freqs, transition_failed); | |
477 | ||
478 | policy->transition_ongoing = false; | |
ca654dc3 | 479 | policy->transition_task = NULL; |
12478cf0 SB |
480 | |
481 | wake_up(&policy->transition_wait); | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); | |
484 | ||
1da177e4 | 485 | |
1da177e4 LT |
486 | /********************************************************************* |
487 | * SYSFS INTERFACE * | |
488 | *********************************************************************/ | |
8a5c74a1 | 489 | static ssize_t show_boost(struct kobject *kobj, |
6f19efc0 LM |
490 | struct attribute *attr, char *buf) |
491 | { | |
492 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); | |
493 | } | |
494 | ||
495 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, | |
496 | const char *buf, size_t count) | |
497 | { | |
498 | int ret, enable; | |
499 | ||
500 | ret = sscanf(buf, "%d", &enable); | |
501 | if (ret != 1 || enable < 0 || enable > 1) | |
502 | return -EINVAL; | |
503 | ||
504 | if (cpufreq_boost_trigger_state(enable)) { | |
e837f9b5 JP |
505 | pr_err("%s: Cannot %s BOOST!\n", |
506 | __func__, enable ? "enable" : "disable"); | |
6f19efc0 LM |
507 | return -EINVAL; |
508 | } | |
509 | ||
e837f9b5 JP |
510 | pr_debug("%s: cpufreq BOOST %s\n", |
511 | __func__, enable ? "enabled" : "disabled"); | |
6f19efc0 LM |
512 | |
513 | return count; | |
514 | } | |
515 | define_one_global_rw(boost); | |
1da177e4 | 516 | |
42f91fa1 | 517 | static struct cpufreq_governor *find_governor(const char *str_governor) |
3bcb09a3 JF |
518 | { |
519 | struct cpufreq_governor *t; | |
520 | ||
f7b27061 | 521 | for_each_governor(t) |
7c4f4539 | 522 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
3bcb09a3 JF |
523 | return t; |
524 | ||
525 | return NULL; | |
526 | } | |
527 | ||
1da177e4 LT |
528 | /** |
529 | * cpufreq_parse_governor - parse a governor string | |
530 | */ | |
905d77cd | 531 | static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, |
1da177e4 LT |
532 | struct cpufreq_governor **governor) |
533 | { | |
3bcb09a3 | 534 | int err = -EINVAL; |
1c3d85dd RW |
535 | |
536 | if (!cpufreq_driver) | |
3bcb09a3 JF |
537 | goto out; |
538 | ||
1c3d85dd | 539 | if (cpufreq_driver->setpolicy) { |
7c4f4539 | 540 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { |
1da177e4 | 541 | *policy = CPUFREQ_POLICY_PERFORMANCE; |
3bcb09a3 | 542 | err = 0; |
7c4f4539 | 543 | } else if (!strncasecmp(str_governor, "powersave", |
e08f5f5b | 544 | CPUFREQ_NAME_LEN)) { |
1da177e4 | 545 | *policy = CPUFREQ_POLICY_POWERSAVE; |
3bcb09a3 | 546 | err = 0; |
1da177e4 | 547 | } |
2e1cc3a5 | 548 | } else { |
1da177e4 | 549 | struct cpufreq_governor *t; |
3bcb09a3 | 550 | |
3fc54d37 | 551 | mutex_lock(&cpufreq_governor_mutex); |
3bcb09a3 | 552 | |
42f91fa1 | 553 | t = find_governor(str_governor); |
3bcb09a3 | 554 | |
ea714970 | 555 | if (t == NULL) { |
1a8e1463 | 556 | int ret; |
ea714970 | 557 | |
1a8e1463 KC |
558 | mutex_unlock(&cpufreq_governor_mutex); |
559 | ret = request_module("cpufreq_%s", str_governor); | |
560 | mutex_lock(&cpufreq_governor_mutex); | |
ea714970 | 561 | |
1a8e1463 | 562 | if (ret == 0) |
42f91fa1 | 563 | t = find_governor(str_governor); |
ea714970 JF |
564 | } |
565 | ||
3bcb09a3 JF |
566 | if (t != NULL) { |
567 | *governor = t; | |
568 | err = 0; | |
1da177e4 | 569 | } |
3bcb09a3 | 570 | |
3fc54d37 | 571 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 | 572 | } |
29464f28 | 573 | out: |
3bcb09a3 | 574 | return err; |
1da177e4 | 575 | } |
1da177e4 | 576 | |
1da177e4 | 577 | /** |
e08f5f5b GS |
578 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
579 | * print out cpufreq information | |
1da177e4 LT |
580 | * |
581 | * Write out information from cpufreq_driver->policy[cpu]; object must be | |
582 | * "unsigned int". | |
583 | */ | |
584 | ||
32ee8c3e DJ |
585 | #define show_one(file_name, object) \ |
586 | static ssize_t show_##file_name \ | |
905d77cd | 587 | (struct cpufreq_policy *policy, char *buf) \ |
32ee8c3e | 588 | { \ |
29464f28 | 589 | return sprintf(buf, "%u\n", policy->object); \ |
1da177e4 LT |
590 | } |
591 | ||
592 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); | |
593 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); | |
ed129784 | 594 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
1da177e4 LT |
595 | show_one(scaling_min_freq, min); |
596 | show_one(scaling_max_freq, max); | |
c034b02e | 597 | |
09347b29 | 598 | static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
c034b02e DB |
599 | { |
600 | ssize_t ret; | |
601 | ||
602 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) | |
603 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); | |
604 | else | |
605 | ret = sprintf(buf, "%u\n", policy->cur); | |
606 | return ret; | |
607 | } | |
1da177e4 | 608 | |
037ce839 | 609 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 610 | struct cpufreq_policy *new_policy); |
7970e08b | 611 | |
1da177e4 LT |
612 | /** |
613 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access | |
614 | */ | |
615 | #define store_one(file_name, object) \ | |
616 | static ssize_t store_##file_name \ | |
905d77cd | 617 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
1da177e4 | 618 | { \ |
619c144c | 619 | int ret, temp; \ |
1da177e4 LT |
620 | struct cpufreq_policy new_policy; \ |
621 | \ | |
622 | ret = cpufreq_get_policy(&new_policy, policy->cpu); \ | |
623 | if (ret) \ | |
624 | return -EINVAL; \ | |
625 | \ | |
29464f28 | 626 | ret = sscanf(buf, "%u", &new_policy.object); \ |
1da177e4 LT |
627 | if (ret != 1) \ |
628 | return -EINVAL; \ | |
629 | \ | |
619c144c | 630 | temp = new_policy.object; \ |
037ce839 | 631 | ret = cpufreq_set_policy(policy, &new_policy); \ |
619c144c VH |
632 | if (!ret) \ |
633 | policy->user_policy.object = temp; \ | |
1da177e4 LT |
634 | \ |
635 | return ret ? ret : count; \ | |
636 | } | |
637 | ||
29464f28 DJ |
638 | store_one(scaling_min_freq, min); |
639 | store_one(scaling_max_freq, max); | |
1da177e4 LT |
640 | |
641 | /** | |
642 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware | |
643 | */ | |
905d77cd DJ |
644 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
645 | char *buf) | |
1da177e4 | 646 | { |
d92d50a4 | 647 | unsigned int cur_freq = __cpufreq_get(policy); |
1da177e4 LT |
648 | if (!cur_freq) |
649 | return sprintf(buf, "<unknown>"); | |
650 | return sprintf(buf, "%u\n", cur_freq); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | /** |
654 | * show_scaling_governor - show the current policy for the specified CPU | |
655 | */ | |
905d77cd | 656 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 657 | { |
29464f28 | 658 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
1da177e4 LT |
659 | return sprintf(buf, "powersave\n"); |
660 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) | |
661 | return sprintf(buf, "performance\n"); | |
662 | else if (policy->governor) | |
4b972f0b | 663 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
29464f28 | 664 | policy->governor->name); |
1da177e4 LT |
665 | return -EINVAL; |
666 | } | |
667 | ||
1da177e4 LT |
668 | /** |
669 | * store_scaling_governor - store policy for the specified CPU | |
670 | */ | |
905d77cd DJ |
671 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
672 | const char *buf, size_t count) | |
1da177e4 | 673 | { |
5136fa56 | 674 | int ret; |
1da177e4 LT |
675 | char str_governor[16]; |
676 | struct cpufreq_policy new_policy; | |
677 | ||
678 | ret = cpufreq_get_policy(&new_policy, policy->cpu); | |
679 | if (ret) | |
680 | return ret; | |
681 | ||
29464f28 | 682 | ret = sscanf(buf, "%15s", str_governor); |
1da177e4 LT |
683 | if (ret != 1) |
684 | return -EINVAL; | |
685 | ||
e08f5f5b GS |
686 | if (cpufreq_parse_governor(str_governor, &new_policy.policy, |
687 | &new_policy.governor)) | |
1da177e4 LT |
688 | return -EINVAL; |
689 | ||
037ce839 | 690 | ret = cpufreq_set_policy(policy, &new_policy); |
7970e08b TR |
691 | |
692 | policy->user_policy.policy = policy->policy; | |
693 | policy->user_policy.governor = policy->governor; | |
7970e08b | 694 | |
e08f5f5b GS |
695 | if (ret) |
696 | return ret; | |
697 | else | |
698 | return count; | |
1da177e4 LT |
699 | } |
700 | ||
701 | /** | |
702 | * show_scaling_driver - show the cpufreq driver currently loaded | |
703 | */ | |
905d77cd | 704 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 705 | { |
1c3d85dd | 706 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
1da177e4 LT |
707 | } |
708 | ||
709 | /** | |
710 | * show_scaling_available_governors - show the available CPUfreq governors | |
711 | */ | |
905d77cd DJ |
712 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
713 | char *buf) | |
1da177e4 LT |
714 | { |
715 | ssize_t i = 0; | |
716 | struct cpufreq_governor *t; | |
717 | ||
9c0ebcf7 | 718 | if (!has_target()) { |
1da177e4 LT |
719 | i += sprintf(buf, "performance powersave"); |
720 | goto out; | |
721 | } | |
722 | ||
f7b27061 | 723 | for_each_governor(t) { |
29464f28 DJ |
724 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
725 | - (CPUFREQ_NAME_LEN + 2))) | |
1da177e4 | 726 | goto out; |
4b972f0b | 727 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
1da177e4 | 728 | } |
7d5e350f | 729 | out: |
1da177e4 LT |
730 | i += sprintf(&buf[i], "\n"); |
731 | return i; | |
732 | } | |
e8628dd0 | 733 | |
f4fd3797 | 734 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
1da177e4 LT |
735 | { |
736 | ssize_t i = 0; | |
737 | unsigned int cpu; | |
738 | ||
835481d9 | 739 | for_each_cpu(cpu, mask) { |
1da177e4 LT |
740 | if (i) |
741 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); | |
742 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); | |
743 | if (i >= (PAGE_SIZE - 5)) | |
29464f28 | 744 | break; |
1da177e4 LT |
745 | } |
746 | i += sprintf(&buf[i], "\n"); | |
747 | return i; | |
748 | } | |
f4fd3797 | 749 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
1da177e4 | 750 | |
e8628dd0 DW |
751 | /** |
752 | * show_related_cpus - show the CPUs affected by each transition even if | |
753 | * hw coordination is in use | |
754 | */ | |
755 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) | |
756 | { | |
f4fd3797 | 757 | return cpufreq_show_cpus(policy->related_cpus, buf); |
e8628dd0 DW |
758 | } |
759 | ||
760 | /** | |
761 | * show_affected_cpus - show the CPUs affected by each transition | |
762 | */ | |
763 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) | |
764 | { | |
f4fd3797 | 765 | return cpufreq_show_cpus(policy->cpus, buf); |
e8628dd0 DW |
766 | } |
767 | ||
9e76988e | 768 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
905d77cd | 769 | const char *buf, size_t count) |
9e76988e VP |
770 | { |
771 | unsigned int freq = 0; | |
772 | unsigned int ret; | |
773 | ||
879000f9 | 774 | if (!policy->governor || !policy->governor->store_setspeed) |
9e76988e VP |
775 | return -EINVAL; |
776 | ||
777 | ret = sscanf(buf, "%u", &freq); | |
778 | if (ret != 1) | |
779 | return -EINVAL; | |
780 | ||
781 | policy->governor->store_setspeed(policy, freq); | |
782 | ||
783 | return count; | |
784 | } | |
785 | ||
786 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) | |
787 | { | |
879000f9 | 788 | if (!policy->governor || !policy->governor->show_setspeed) |
9e76988e VP |
789 | return sprintf(buf, "<unsupported>\n"); |
790 | ||
791 | return policy->governor->show_setspeed(policy, buf); | |
792 | } | |
1da177e4 | 793 | |
e2f74f35 | 794 | /** |
8bf1ac72 | 795 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
e2f74f35 TR |
796 | */ |
797 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) | |
798 | { | |
799 | unsigned int limit; | |
800 | int ret; | |
1c3d85dd RW |
801 | if (cpufreq_driver->bios_limit) { |
802 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); | |
e2f74f35 TR |
803 | if (!ret) |
804 | return sprintf(buf, "%u\n", limit); | |
805 | } | |
806 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); | |
807 | } | |
808 | ||
6dad2a29 BP |
809 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
810 | cpufreq_freq_attr_ro(cpuinfo_min_freq); | |
811 | cpufreq_freq_attr_ro(cpuinfo_max_freq); | |
812 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); | |
813 | cpufreq_freq_attr_ro(scaling_available_governors); | |
814 | cpufreq_freq_attr_ro(scaling_driver); | |
815 | cpufreq_freq_attr_ro(scaling_cur_freq); | |
816 | cpufreq_freq_attr_ro(bios_limit); | |
817 | cpufreq_freq_attr_ro(related_cpus); | |
818 | cpufreq_freq_attr_ro(affected_cpus); | |
819 | cpufreq_freq_attr_rw(scaling_min_freq); | |
820 | cpufreq_freq_attr_rw(scaling_max_freq); | |
821 | cpufreq_freq_attr_rw(scaling_governor); | |
822 | cpufreq_freq_attr_rw(scaling_setspeed); | |
1da177e4 | 823 | |
905d77cd | 824 | static struct attribute *default_attrs[] = { |
1da177e4 LT |
825 | &cpuinfo_min_freq.attr, |
826 | &cpuinfo_max_freq.attr, | |
ed129784 | 827 | &cpuinfo_transition_latency.attr, |
1da177e4 LT |
828 | &scaling_min_freq.attr, |
829 | &scaling_max_freq.attr, | |
830 | &affected_cpus.attr, | |
e8628dd0 | 831 | &related_cpus.attr, |
1da177e4 LT |
832 | &scaling_governor.attr, |
833 | &scaling_driver.attr, | |
834 | &scaling_available_governors.attr, | |
9e76988e | 835 | &scaling_setspeed.attr, |
1da177e4 LT |
836 | NULL |
837 | }; | |
838 | ||
29464f28 DJ |
839 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
840 | #define to_attr(a) container_of(a, struct freq_attr, attr) | |
1da177e4 | 841 | |
29464f28 | 842 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
1da177e4 | 843 | { |
905d77cd DJ |
844 | struct cpufreq_policy *policy = to_policy(kobj); |
845 | struct freq_attr *fattr = to_attr(attr); | |
1b750e3b | 846 | ssize_t ret; |
6eed9404 VK |
847 | |
848 | if (!down_read_trylock(&cpufreq_rwsem)) | |
1b750e3b | 849 | return -EINVAL; |
5a01f2e8 | 850 | |
ad7722da | 851 | down_read(&policy->rwsem); |
5a01f2e8 | 852 | |
e08f5f5b GS |
853 | if (fattr->show) |
854 | ret = fattr->show(policy, buf); | |
855 | else | |
856 | ret = -EIO; | |
857 | ||
ad7722da | 858 | up_read(&policy->rwsem); |
6eed9404 | 859 | up_read(&cpufreq_rwsem); |
1b750e3b | 860 | |
1da177e4 LT |
861 | return ret; |
862 | } | |
863 | ||
905d77cd DJ |
864 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
865 | const char *buf, size_t count) | |
1da177e4 | 866 | { |
905d77cd DJ |
867 | struct cpufreq_policy *policy = to_policy(kobj); |
868 | struct freq_attr *fattr = to_attr(attr); | |
a07530b4 | 869 | ssize_t ret = -EINVAL; |
6eed9404 | 870 | |
4f750c93 SB |
871 | get_online_cpus(); |
872 | ||
873 | if (!cpu_online(policy->cpu)) | |
874 | goto unlock; | |
875 | ||
6eed9404 | 876 | if (!down_read_trylock(&cpufreq_rwsem)) |
4f750c93 | 877 | goto unlock; |
5a01f2e8 | 878 | |
ad7722da | 879 | down_write(&policy->rwsem); |
5a01f2e8 | 880 | |
e08f5f5b GS |
881 | if (fattr->store) |
882 | ret = fattr->store(policy, buf, count); | |
883 | else | |
884 | ret = -EIO; | |
885 | ||
ad7722da | 886 | up_write(&policy->rwsem); |
6eed9404 | 887 | |
6eed9404 | 888 | up_read(&cpufreq_rwsem); |
4f750c93 SB |
889 | unlock: |
890 | put_online_cpus(); | |
891 | ||
1da177e4 LT |
892 | return ret; |
893 | } | |
894 | ||
905d77cd | 895 | static void cpufreq_sysfs_release(struct kobject *kobj) |
1da177e4 | 896 | { |
905d77cd | 897 | struct cpufreq_policy *policy = to_policy(kobj); |
2d06d8c4 | 898 | pr_debug("last reference is dropped\n"); |
1da177e4 LT |
899 | complete(&policy->kobj_unregister); |
900 | } | |
901 | ||
52cf25d0 | 902 | static const struct sysfs_ops sysfs_ops = { |
1da177e4 LT |
903 | .show = show, |
904 | .store = store, | |
905 | }; | |
906 | ||
907 | static struct kobj_type ktype_cpufreq = { | |
908 | .sysfs_ops = &sysfs_ops, | |
909 | .default_attrs = default_attrs, | |
910 | .release = cpufreq_sysfs_release, | |
911 | }; | |
912 | ||
2361be23 VK |
913 | struct kobject *cpufreq_global_kobject; |
914 | EXPORT_SYMBOL(cpufreq_global_kobject); | |
915 | ||
916 | static int cpufreq_global_kobject_usage; | |
917 | ||
918 | int cpufreq_get_global_kobject(void) | |
919 | { | |
920 | if (!cpufreq_global_kobject_usage++) | |
921 | return kobject_add(cpufreq_global_kobject, | |
922 | &cpu_subsys.dev_root->kobj, "%s", "cpufreq"); | |
923 | ||
924 | return 0; | |
925 | } | |
926 | EXPORT_SYMBOL(cpufreq_get_global_kobject); | |
927 | ||
928 | void cpufreq_put_global_kobject(void) | |
929 | { | |
930 | if (!--cpufreq_global_kobject_usage) | |
931 | kobject_del(cpufreq_global_kobject); | |
932 | } | |
933 | EXPORT_SYMBOL(cpufreq_put_global_kobject); | |
934 | ||
935 | int cpufreq_sysfs_create_file(const struct attribute *attr) | |
936 | { | |
937 | int ret = cpufreq_get_global_kobject(); | |
938 | ||
939 | if (!ret) { | |
940 | ret = sysfs_create_file(cpufreq_global_kobject, attr); | |
941 | if (ret) | |
942 | cpufreq_put_global_kobject(); | |
943 | } | |
944 | ||
945 | return ret; | |
946 | } | |
947 | EXPORT_SYMBOL(cpufreq_sysfs_create_file); | |
948 | ||
949 | void cpufreq_sysfs_remove_file(const struct attribute *attr) | |
950 | { | |
951 | sysfs_remove_file(cpufreq_global_kobject, attr); | |
952 | cpufreq_put_global_kobject(); | |
953 | } | |
954 | EXPORT_SYMBOL(cpufreq_sysfs_remove_file); | |
955 | ||
19d6f7ec | 956 | /* symlink affected CPUs */ |
308b60e7 | 957 | static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy) |
19d6f7ec DJ |
958 | { |
959 | unsigned int j; | |
960 | int ret = 0; | |
961 | ||
962 | for_each_cpu(j, policy->cpus) { | |
8a25a2fd | 963 | struct device *cpu_dev; |
19d6f7ec | 964 | |
308b60e7 | 965 | if (j == policy->cpu) |
19d6f7ec | 966 | continue; |
19d6f7ec | 967 | |
e8fdde10 | 968 | pr_debug("Adding link for CPU: %u\n", j); |
8a25a2fd KS |
969 | cpu_dev = get_cpu_device(j); |
970 | ret = sysfs_create_link(&cpu_dev->kobj, &policy->kobj, | |
19d6f7ec | 971 | "cpufreq"); |
71c3461e RW |
972 | if (ret) |
973 | break; | |
19d6f7ec DJ |
974 | } |
975 | return ret; | |
976 | } | |
977 | ||
308b60e7 | 978 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, |
8a25a2fd | 979 | struct device *dev) |
909a694e DJ |
980 | { |
981 | struct freq_attr **drv_attr; | |
909a694e | 982 | int ret = 0; |
909a694e | 983 | |
909a694e | 984 | /* set up files for this cpu device */ |
1c3d85dd | 985 | drv_attr = cpufreq_driver->attr; |
f13f1184 | 986 | while (drv_attr && *drv_attr) { |
909a694e DJ |
987 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
988 | if (ret) | |
6d4e81ed | 989 | return ret; |
909a694e DJ |
990 | drv_attr++; |
991 | } | |
1c3d85dd | 992 | if (cpufreq_driver->get) { |
909a694e DJ |
993 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
994 | if (ret) | |
6d4e81ed | 995 | return ret; |
909a694e | 996 | } |
c034b02e DB |
997 | |
998 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); | |
999 | if (ret) | |
6d4e81ed | 1000 | return ret; |
c034b02e | 1001 | |
1c3d85dd | 1002 | if (cpufreq_driver->bios_limit) { |
e2f74f35 TR |
1003 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
1004 | if (ret) | |
6d4e81ed | 1005 | return ret; |
e2f74f35 | 1006 | } |
909a694e | 1007 | |
6d4e81ed | 1008 | return cpufreq_add_dev_symlink(policy); |
e18f1682 SB |
1009 | } |
1010 | ||
1011 | static void cpufreq_init_policy(struct cpufreq_policy *policy) | |
1012 | { | |
6e2c89d1 | 1013 | struct cpufreq_governor *gov = NULL; |
e18f1682 SB |
1014 | struct cpufreq_policy new_policy; |
1015 | int ret = 0; | |
1016 | ||
d5b73cd8 | 1017 | memcpy(&new_policy, policy, sizeof(*policy)); |
a27a9ab7 | 1018 | |
6e2c89d1 | 1019 | /* Update governor of new_policy to the governor used before hotplug */ |
42f91fa1 | 1020 | gov = find_governor(per_cpu(cpufreq_cpu_governor, policy->cpu)); |
6e2c89d1 | 1021 | if (gov) |
1022 | pr_debug("Restoring governor %s for cpu %d\n", | |
1023 | policy->governor->name, policy->cpu); | |
1024 | else | |
1025 | gov = CPUFREQ_DEFAULT_GOVERNOR; | |
1026 | ||
1027 | new_policy.governor = gov; | |
1028 | ||
a27a9ab7 JB |
1029 | /* Use the default policy if its valid. */ |
1030 | if (cpufreq_driver->setpolicy) | |
6e2c89d1 | 1031 | cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); |
ecf7e461 DJ |
1032 | |
1033 | /* set default policy */ | |
037ce839 | 1034 | ret = cpufreq_set_policy(policy, &new_policy); |
ecf7e461 | 1035 | if (ret) { |
2d06d8c4 | 1036 | pr_debug("setting policy failed\n"); |
1c3d85dd RW |
1037 | if (cpufreq_driver->exit) |
1038 | cpufreq_driver->exit(policy); | |
ecf7e461 | 1039 | } |
909a694e DJ |
1040 | } |
1041 | ||
d8d3b471 | 1042 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, |
42f921a6 | 1043 | unsigned int cpu, struct device *dev) |
fcf80582 | 1044 | { |
9c0ebcf7 | 1045 | int ret = 0; |
fcf80582 | 1046 | |
bb29ae15 VK |
1047 | /* Has this CPU been taken care of already? */ |
1048 | if (cpumask_test_cpu(cpu, policy->cpus)) | |
1049 | return 0; | |
1050 | ||
9c0ebcf7 | 1051 | if (has_target()) { |
3de9bdeb VK |
1052 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
1053 | if (ret) { | |
1054 | pr_err("%s: Failed to stop governor\n", __func__); | |
1055 | return ret; | |
1056 | } | |
1057 | } | |
fcf80582 | 1058 | |
ad7722da | 1059 | down_write(&policy->rwsem); |
fcf80582 | 1060 | cpumask_set_cpu(cpu, policy->cpus); |
ad7722da | 1061 | up_write(&policy->rwsem); |
2eaa3e2d | 1062 | |
9c0ebcf7 | 1063 | if (has_target()) { |
e5c87b76 SK |
1064 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
1065 | if (!ret) | |
1066 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1067 | ||
1068 | if (ret) { | |
3de9bdeb VK |
1069 | pr_err("%s: Failed to start governor\n", __func__); |
1070 | return ret; | |
1071 | } | |
820c6ca2 | 1072 | } |
fcf80582 | 1073 | |
42f921a6 | 1074 | return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); |
fcf80582 | 1075 | } |
1da177e4 | 1076 | |
8414809c SB |
1077 | static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) |
1078 | { | |
1079 | struct cpufreq_policy *policy; | |
1080 | unsigned long flags; | |
1081 | ||
44871c9c | 1082 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
3914d379 | 1083 | policy = per_cpu(cpufreq_cpu_data, cpu); |
44871c9c | 1084 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
8414809c | 1085 | |
3914d379 VK |
1086 | if (likely(policy)) { |
1087 | /* Policy should be inactive here */ | |
1088 | WARN_ON(!policy_is_inactive(policy)); | |
09712f55 | 1089 | policy->governor = NULL; |
3914d379 | 1090 | } |
6e2c89d1 | 1091 | |
8414809c SB |
1092 | return policy; |
1093 | } | |
1094 | ||
e9698cc5 SB |
1095 | static struct cpufreq_policy *cpufreq_policy_alloc(void) |
1096 | { | |
1097 | struct cpufreq_policy *policy; | |
1098 | ||
1099 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); | |
1100 | if (!policy) | |
1101 | return NULL; | |
1102 | ||
1103 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) | |
1104 | goto err_free_policy; | |
1105 | ||
1106 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) | |
1107 | goto err_free_cpumask; | |
1108 | ||
c88a1f8b | 1109 | INIT_LIST_HEAD(&policy->policy_list); |
ad7722da | 1110 | init_rwsem(&policy->rwsem); |
12478cf0 SB |
1111 | spin_lock_init(&policy->transition_lock); |
1112 | init_waitqueue_head(&policy->transition_wait); | |
818c5712 VK |
1113 | init_completion(&policy->kobj_unregister); |
1114 | INIT_WORK(&policy->update, handle_update); | |
ad7722da | 1115 | |
e9698cc5 SB |
1116 | return policy; |
1117 | ||
1118 | err_free_cpumask: | |
1119 | free_cpumask_var(policy->cpus); | |
1120 | err_free_policy: | |
1121 | kfree(policy); | |
1122 | ||
1123 | return NULL; | |
1124 | } | |
1125 | ||
42f921a6 VK |
1126 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) |
1127 | { | |
1128 | struct kobject *kobj; | |
1129 | struct completion *cmp; | |
1130 | ||
fcd7af91 VK |
1131 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1132 | CPUFREQ_REMOVE_POLICY, policy); | |
1133 | ||
42f921a6 VK |
1134 | down_read(&policy->rwsem); |
1135 | kobj = &policy->kobj; | |
1136 | cmp = &policy->kobj_unregister; | |
1137 | up_read(&policy->rwsem); | |
1138 | kobject_put(kobj); | |
1139 | ||
1140 | /* | |
1141 | * We need to make sure that the underlying kobj is | |
1142 | * actually not referenced anymore by anybody before we | |
1143 | * proceed with unloading. | |
1144 | */ | |
1145 | pr_debug("waiting for dropping of refcount\n"); | |
1146 | wait_for_completion(cmp); | |
1147 | pr_debug("wait complete\n"); | |
1148 | } | |
1149 | ||
e9698cc5 SB |
1150 | static void cpufreq_policy_free(struct cpufreq_policy *policy) |
1151 | { | |
988bed09 VK |
1152 | unsigned long flags; |
1153 | int cpu; | |
1154 | ||
1155 | /* Remove policy from list */ | |
1156 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
1157 | list_del(&policy->policy_list); | |
1158 | ||
1159 | for_each_cpu(cpu, policy->related_cpus) | |
1160 | per_cpu(cpufreq_cpu_data, cpu) = NULL; | |
1161 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1162 | ||
e9698cc5 SB |
1163 | free_cpumask_var(policy->related_cpus); |
1164 | free_cpumask_var(policy->cpus); | |
1165 | kfree(policy); | |
1166 | } | |
1167 | ||
1bfb425b VK |
1168 | static int update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu, |
1169 | struct device *cpu_dev) | |
0d66b91e | 1170 | { |
1bfb425b VK |
1171 | int ret; |
1172 | ||
99ec899e | 1173 | if (WARN_ON(cpu == policy->cpu)) |
1bfb425b VK |
1174 | return 0; |
1175 | ||
1176 | /* Move kobject to the new policy->cpu */ | |
1177 | ret = kobject_move(&policy->kobj, &cpu_dev->kobj); | |
1178 | if (ret) { | |
1179 | pr_err("%s: Failed to move kobj: %d\n", __func__, ret); | |
1180 | return ret; | |
1181 | } | |
cb38ed5c | 1182 | |
ad7722da | 1183 | down_write(&policy->rwsem); |
0d66b91e | 1184 | policy->cpu = cpu; |
ad7722da | 1185 | up_write(&policy->rwsem); |
8efd5765 | 1186 | |
1bfb425b | 1187 | return 0; |
0d66b91e SB |
1188 | } |
1189 | ||
23faf0b7 VK |
1190 | /** |
1191 | * cpufreq_add_dev - add a CPU device | |
1192 | * | |
1193 | * Adds the cpufreq interface for a CPU device. | |
1194 | * | |
1195 | * The Oracle says: try running cpufreq registration/unregistration concurrently | |
1196 | * with with cpu hotplugging and all hell will break loose. Tried to clean this | |
1197 | * mess up, but more thorough testing is needed. - Mathieu | |
1198 | */ | |
1199 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) | |
1da177e4 | 1200 | { |
fcf80582 | 1201 | unsigned int j, cpu = dev->id; |
65922465 | 1202 | int ret = -ENOMEM; |
7f0c020a | 1203 | struct cpufreq_policy *policy; |
1da177e4 | 1204 | unsigned long flags; |
96bbbe4a | 1205 | bool recover_policy = cpufreq_suspended; |
1da177e4 | 1206 | |
c32b6b8e AR |
1207 | if (cpu_is_offline(cpu)) |
1208 | return 0; | |
1209 | ||
2d06d8c4 | 1210 | pr_debug("adding CPU %u\n", cpu); |
1da177e4 | 1211 | |
6eed9404 VK |
1212 | if (!down_read_trylock(&cpufreq_rwsem)) |
1213 | return 0; | |
1214 | ||
bb29ae15 | 1215 | /* Check if this CPU already has a policy to manage it */ |
9104bb26 VK |
1216 | policy = per_cpu(cpufreq_cpu_data, cpu); |
1217 | if (policy && !policy_is_inactive(policy)) { | |
1218 | WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); | |
1219 | ret = cpufreq_add_policy_cpu(policy, cpu, dev); | |
1220 | up_read(&cpufreq_rwsem); | |
1221 | return ret; | |
fcf80582 | 1222 | } |
1da177e4 | 1223 | |
72368d12 RW |
1224 | /* |
1225 | * Restore the saved policy when doing light-weight init and fall back | |
1226 | * to the full init if that fails. | |
1227 | */ | |
96bbbe4a | 1228 | policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL; |
72368d12 | 1229 | if (!policy) { |
96bbbe4a | 1230 | recover_policy = false; |
8414809c | 1231 | policy = cpufreq_policy_alloc(); |
72368d12 RW |
1232 | if (!policy) |
1233 | goto nomem_out; | |
1234 | } | |
0d66b91e SB |
1235 | |
1236 | /* | |
1237 | * In the resume path, since we restore a saved policy, the assignment | |
1238 | * to policy->cpu is like an update of the existing policy, rather than | |
1239 | * the creation of a brand new one. So we need to perform this update | |
1240 | * by invoking update_policy_cpu(). | |
1241 | */ | |
1bfb425b VK |
1242 | if (recover_policy && cpu != policy->cpu) |
1243 | WARN_ON(update_policy_cpu(policy, cpu, dev)); | |
1244 | else | |
0d66b91e SB |
1245 | policy->cpu = cpu; |
1246 | ||
835481d9 | 1247 | cpumask_copy(policy->cpus, cpumask_of(cpu)); |
1da177e4 | 1248 | |
1da177e4 LT |
1249 | /* call driver. From then on the cpufreq must be able |
1250 | * to accept all calls to ->verify and ->setpolicy for this CPU | |
1251 | */ | |
1c3d85dd | 1252 | ret = cpufreq_driver->init(policy); |
1da177e4 | 1253 | if (ret) { |
2d06d8c4 | 1254 | pr_debug("initialization failed\n"); |
2eaa3e2d | 1255 | goto err_set_policy_cpu; |
1da177e4 | 1256 | } |
643ae6e8 | 1257 | |
6d4e81ed TV |
1258 | down_write(&policy->rwsem); |
1259 | ||
5a7e56a5 VK |
1260 | /* related cpus should atleast have policy->cpus */ |
1261 | cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); | |
1262 | ||
1263 | /* | |
1264 | * affected cpus must always be the one, which are online. We aren't | |
1265 | * managing offline cpus here. | |
1266 | */ | |
1267 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); | |
1268 | ||
96bbbe4a | 1269 | if (!recover_policy) { |
5a7e56a5 VK |
1270 | policy->user_policy.min = policy->min; |
1271 | policy->user_policy.max = policy->max; | |
6d4e81ed TV |
1272 | |
1273 | /* prepare interface data */ | |
1274 | ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, | |
1275 | &dev->kobj, "cpufreq"); | |
1276 | if (ret) { | |
1277 | pr_err("%s: failed to init policy->kobj: %d\n", | |
1278 | __func__, ret); | |
1279 | goto err_init_policy_kobj; | |
1280 | } | |
5a7e56a5 | 1281 | |
988bed09 VK |
1282 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1283 | for_each_cpu(j, policy->related_cpus) | |
1284 | per_cpu(cpufreq_cpu_data, j) = policy; | |
1285 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1286 | } | |
652ed95d | 1287 | |
2ed99e39 | 1288 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
da60ce9f VK |
1289 | policy->cur = cpufreq_driver->get(policy->cpu); |
1290 | if (!policy->cur) { | |
1291 | pr_err("%s: ->get() failed\n", __func__); | |
1292 | goto err_get_freq; | |
1293 | } | |
1294 | } | |
1295 | ||
d3916691 VK |
1296 | /* |
1297 | * Sometimes boot loaders set CPU frequency to a value outside of | |
1298 | * frequency table present with cpufreq core. In such cases CPU might be | |
1299 | * unstable if it has to run on that frequency for long duration of time | |
1300 | * and so its better to set it to a frequency which is specified in | |
1301 | * freq-table. This also makes cpufreq stats inconsistent as | |
1302 | * cpufreq-stats would fail to register because current frequency of CPU | |
1303 | * isn't found in freq-table. | |
1304 | * | |
1305 | * Because we don't want this change to effect boot process badly, we go | |
1306 | * for the next freq which is >= policy->cur ('cur' must be set by now, | |
1307 | * otherwise we will end up setting freq to lowest of the table as 'cur' | |
1308 | * is initialized to zero). | |
1309 | * | |
1310 | * We are passing target-freq as "policy->cur - 1" otherwise | |
1311 | * __cpufreq_driver_target() would simply fail, as policy->cur will be | |
1312 | * equal to target-freq. | |
1313 | */ | |
1314 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) | |
1315 | && has_target()) { | |
1316 | /* Are we running at unknown frequency ? */ | |
1317 | ret = cpufreq_frequency_table_get_index(policy, policy->cur); | |
1318 | if (ret == -EINVAL) { | |
1319 | /* Warn user and fix it */ | |
1320 | pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", | |
1321 | __func__, policy->cpu, policy->cur); | |
1322 | ret = __cpufreq_driver_target(policy, policy->cur - 1, | |
1323 | CPUFREQ_RELATION_L); | |
1324 | ||
1325 | /* | |
1326 | * Reaching here after boot in a few seconds may not | |
1327 | * mean that system will remain stable at "unknown" | |
1328 | * frequency for longer duration. Hence, a BUG_ON(). | |
1329 | */ | |
1330 | BUG_ON(ret); | |
1331 | pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", | |
1332 | __func__, policy->cpu, policy->cur); | |
1333 | } | |
1334 | } | |
1335 | ||
a1531acd TR |
1336 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1337 | CPUFREQ_START, policy); | |
1338 | ||
96bbbe4a | 1339 | if (!recover_policy) { |
308b60e7 | 1340 | ret = cpufreq_add_dev_interface(policy, dev); |
a82fab29 SB |
1341 | if (ret) |
1342 | goto err_out_unregister; | |
fcd7af91 VK |
1343 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1344 | CPUFREQ_CREATE_POLICY, policy); | |
8ff69732 | 1345 | |
988bed09 VK |
1346 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1347 | list_add(&policy->policy_list, &cpufreq_policy_list); | |
1348 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1349 | } | |
9515f4d6 | 1350 | |
e18f1682 SB |
1351 | cpufreq_init_policy(policy); |
1352 | ||
96bbbe4a | 1353 | if (!recover_policy) { |
08fd8c1c VK |
1354 | policy->user_policy.policy = policy->policy; |
1355 | policy->user_policy.governor = policy->governor; | |
1356 | } | |
4e97b631 | 1357 | up_write(&policy->rwsem); |
08fd8c1c | 1358 | |
038c5b3e | 1359 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
7c45cf31 | 1360 | |
6eed9404 VK |
1361 | up_read(&cpufreq_rwsem); |
1362 | ||
7c45cf31 VK |
1363 | /* Callback for handling stuff after policy is ready */ |
1364 | if (cpufreq_driver->ready) | |
1365 | cpufreq_driver->ready(policy); | |
1366 | ||
2d06d8c4 | 1367 | pr_debug("initialization complete\n"); |
87c32271 | 1368 | |
1da177e4 LT |
1369 | return 0; |
1370 | ||
1da177e4 | 1371 | err_out_unregister: |
652ed95d | 1372 | err_get_freq: |
6d4e81ed TV |
1373 | if (!recover_policy) { |
1374 | kobject_put(&policy->kobj); | |
1375 | wait_for_completion(&policy->kobj_unregister); | |
1376 | } | |
1377 | err_init_policy_kobj: | |
7106e02b PB |
1378 | up_write(&policy->rwsem); |
1379 | ||
da60ce9f VK |
1380 | if (cpufreq_driver->exit) |
1381 | cpufreq_driver->exit(policy); | |
2eaa3e2d | 1382 | err_set_policy_cpu: |
3914d379 | 1383 | if (recover_policy) |
42f921a6 | 1384 | cpufreq_policy_put_kobj(policy); |
e9698cc5 | 1385 | cpufreq_policy_free(policy); |
42f921a6 | 1386 | |
1da177e4 | 1387 | nomem_out: |
6eed9404 VK |
1388 | up_read(&cpufreq_rwsem); |
1389 | ||
1da177e4 LT |
1390 | return ret; |
1391 | } | |
1392 | ||
cedb70af | 1393 | static int __cpufreq_remove_dev_prepare(struct device *dev, |
96bbbe4a | 1394 | struct subsys_interface *sif) |
1da177e4 | 1395 | { |
f9ba680d | 1396 | unsigned int cpu = dev->id, cpus; |
1bfb425b | 1397 | int ret; |
3a3e9e06 | 1398 | struct cpufreq_policy *policy; |
1da177e4 | 1399 | |
b8eed8af | 1400 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
1da177e4 | 1401 | |
988bed09 | 1402 | policy = cpufreq_cpu_get_raw(cpu); |
3a3e9e06 | 1403 | if (!policy) { |
b8eed8af | 1404 | pr_debug("%s: No cpu_data found\n", __func__); |
1da177e4 LT |
1405 | return -EINVAL; |
1406 | } | |
1da177e4 | 1407 | |
9c0ebcf7 | 1408 | if (has_target()) { |
3de9bdeb VK |
1409 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
1410 | if (ret) { | |
1411 | pr_err("%s: Failed to stop governor\n", __func__); | |
1412 | return ret; | |
1413 | } | |
1da177e4 | 1414 | |
fa69e33f | 1415 | strncpy(per_cpu(cpufreq_cpu_governor, cpu), |
3a3e9e06 | 1416 | policy->governor->name, CPUFREQ_NAME_LEN); |
db5f2995 | 1417 | } |
1da177e4 | 1418 | |
ad7722da | 1419 | down_read(&policy->rwsem); |
3a3e9e06 | 1420 | cpus = cpumask_weight(policy->cpus); |
ad7722da | 1421 | up_read(&policy->rwsem); |
084f3493 | 1422 | |
61173f25 | 1423 | if (cpu != policy->cpu) { |
6964d91d | 1424 | sysfs_remove_link(&dev->kobj, "cpufreq"); |
73bf0fc2 | 1425 | } else if (cpus > 1) { |
1bfb425b VK |
1426 | /* Nominate new CPU */ |
1427 | int new_cpu = cpumask_any_but(policy->cpus, cpu); | |
1428 | struct device *cpu_dev = get_cpu_device(new_cpu); | |
a82fab29 | 1429 | |
1bfb425b VK |
1430 | sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); |
1431 | ret = update_policy_cpu(policy, new_cpu, cpu_dev); | |
1432 | if (ret) { | |
1433 | if (sysfs_create_link(&cpu_dev->kobj, &policy->kobj, | |
1434 | "cpufreq")) | |
1435 | pr_err("%s: Failed to restore kobj link to cpu:%d\n", | |
1436 | __func__, cpu_dev->id); | |
1437 | return ret; | |
1da177e4 | 1438 | } |
1bfb425b VK |
1439 | |
1440 | if (!cpufreq_suspended) | |
1441 | pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n", | |
1442 | __func__, new_cpu, cpu); | |
789ca243 | 1443 | } else if (cpufreq_driver->stop_cpu) { |
367dc4aa | 1444 | cpufreq_driver->stop_cpu(policy); |
1da177e4 | 1445 | } |
1da177e4 | 1446 | |
cedb70af SB |
1447 | return 0; |
1448 | } | |
1449 | ||
1450 | static int __cpufreq_remove_dev_finish(struct device *dev, | |
96bbbe4a | 1451 | struct subsys_interface *sif) |
cedb70af | 1452 | { |
988bed09 | 1453 | unsigned int cpu = dev->id; |
cedb70af | 1454 | int ret; |
988bed09 | 1455 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); |
cedb70af SB |
1456 | |
1457 | if (!policy) { | |
1458 | pr_debug("%s: No cpu_data found\n", __func__); | |
1459 | return -EINVAL; | |
1460 | } | |
1461 | ||
ad7722da | 1462 | down_write(&policy->rwsem); |
303ae723 | 1463 | cpumask_clear_cpu(cpu, policy->cpus); |
ad7722da | 1464 | up_write(&policy->rwsem); |
cedb70af | 1465 | |
b8eed8af | 1466 | /* If cpu is last user of policy, free policy */ |
988bed09 | 1467 | if (policy_is_inactive(policy)) { |
9c0ebcf7 | 1468 | if (has_target()) { |
3de9bdeb VK |
1469 | ret = __cpufreq_governor(policy, |
1470 | CPUFREQ_GOV_POLICY_EXIT); | |
1471 | if (ret) { | |
1472 | pr_err("%s: Failed to exit governor\n", | |
e837f9b5 | 1473 | __func__); |
3de9bdeb VK |
1474 | return ret; |
1475 | } | |
edab2fbc | 1476 | } |
2a998599 | 1477 | |
96bbbe4a | 1478 | if (!cpufreq_suspended) |
42f921a6 | 1479 | cpufreq_policy_put_kobj(policy); |
7d26e2d5 | 1480 | |
8414809c SB |
1481 | /* |
1482 | * Perform the ->exit() even during light-weight tear-down, | |
1483 | * since this is a core component, and is essential for the | |
1484 | * subsequent light-weight ->init() to succeed. | |
b8eed8af | 1485 | */ |
1c3d85dd | 1486 | if (cpufreq_driver->exit) |
3a3e9e06 | 1487 | cpufreq_driver->exit(policy); |
27ecddc2 | 1488 | |
96bbbe4a | 1489 | if (!cpufreq_suspended) |
3a3e9e06 | 1490 | cpufreq_policy_free(policy); |
e5c87b76 SK |
1491 | } else if (has_target()) { |
1492 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
1493 | if (!ret) | |
1494 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1495 | ||
1496 | if (ret) { | |
1497 | pr_err("%s: Failed to start governor\n", __func__); | |
1498 | return ret; | |
2a998599 | 1499 | } |
27ecddc2 | 1500 | } |
1da177e4 | 1501 | |
1da177e4 LT |
1502 | return 0; |
1503 | } | |
1504 | ||
cedb70af | 1505 | /** |
27a862e9 | 1506 | * cpufreq_remove_dev - remove a CPU device |
cedb70af SB |
1507 | * |
1508 | * Removes the cpufreq interface for a CPU device. | |
cedb70af | 1509 | */ |
8a25a2fd | 1510 | static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
5a01f2e8 | 1511 | { |
8a25a2fd | 1512 | unsigned int cpu = dev->id; |
27a862e9 | 1513 | int ret; |
ec28297a VP |
1514 | |
1515 | if (cpu_is_offline(cpu)) | |
1516 | return 0; | |
1517 | ||
96bbbe4a | 1518 | ret = __cpufreq_remove_dev_prepare(dev, sif); |
27a862e9 VK |
1519 | |
1520 | if (!ret) | |
96bbbe4a | 1521 | ret = __cpufreq_remove_dev_finish(dev, sif); |
27a862e9 VK |
1522 | |
1523 | return ret; | |
5a01f2e8 VP |
1524 | } |
1525 | ||
65f27f38 | 1526 | static void handle_update(struct work_struct *work) |
1da177e4 | 1527 | { |
65f27f38 DH |
1528 | struct cpufreq_policy *policy = |
1529 | container_of(work, struct cpufreq_policy, update); | |
1530 | unsigned int cpu = policy->cpu; | |
2d06d8c4 | 1531 | pr_debug("handle_update for cpu %u called\n", cpu); |
1da177e4 LT |
1532 | cpufreq_update_policy(cpu); |
1533 | } | |
1534 | ||
1535 | /** | |
bb176f7d VK |
1536 | * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're |
1537 | * in deep trouble. | |
a1e1dc41 | 1538 | * @policy: policy managing CPUs |
1da177e4 LT |
1539 | * @new_freq: CPU frequency the CPU actually runs at |
1540 | * | |
29464f28 DJ |
1541 | * We adjust to current frequency first, and need to clean up later. |
1542 | * So either call to cpufreq_update_policy() or schedule handle_update()). | |
1da177e4 | 1543 | */ |
a1e1dc41 | 1544 | static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
e08f5f5b | 1545 | unsigned int new_freq) |
1da177e4 LT |
1546 | { |
1547 | struct cpufreq_freqs freqs; | |
b43a7ffb | 1548 | |
e837f9b5 | 1549 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
a1e1dc41 | 1550 | policy->cur, new_freq); |
1da177e4 | 1551 | |
a1e1dc41 | 1552 | freqs.old = policy->cur; |
1da177e4 | 1553 | freqs.new = new_freq; |
b43a7ffb | 1554 | |
8fec051e VK |
1555 | cpufreq_freq_transition_begin(policy, &freqs); |
1556 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1da177e4 LT |
1557 | } |
1558 | ||
32ee8c3e | 1559 | /** |
4ab70df4 | 1560 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
95235ca2 VP |
1561 | * @cpu: CPU number |
1562 | * | |
1563 | * This is the last known freq, without actually getting it from the driver. | |
1564 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. | |
1565 | */ | |
1566 | unsigned int cpufreq_quick_get(unsigned int cpu) | |
1567 | { | |
9e21ba8b | 1568 | struct cpufreq_policy *policy; |
e08f5f5b | 1569 | unsigned int ret_freq = 0; |
95235ca2 | 1570 | |
1c3d85dd RW |
1571 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
1572 | return cpufreq_driver->get(cpu); | |
9e21ba8b DB |
1573 | |
1574 | policy = cpufreq_cpu_get(cpu); | |
95235ca2 | 1575 | if (policy) { |
e08f5f5b | 1576 | ret_freq = policy->cur; |
95235ca2 VP |
1577 | cpufreq_cpu_put(policy); |
1578 | } | |
1579 | ||
4d34a67d | 1580 | return ret_freq; |
95235ca2 VP |
1581 | } |
1582 | EXPORT_SYMBOL(cpufreq_quick_get); | |
1583 | ||
3d737108 JB |
1584 | /** |
1585 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU | |
1586 | * @cpu: CPU number | |
1587 | * | |
1588 | * Just return the max possible frequency for a given CPU. | |
1589 | */ | |
1590 | unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
1591 | { | |
1592 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
1593 | unsigned int ret_freq = 0; | |
1594 | ||
1595 | if (policy) { | |
1596 | ret_freq = policy->max; | |
1597 | cpufreq_cpu_put(policy); | |
1598 | } | |
1599 | ||
1600 | return ret_freq; | |
1601 | } | |
1602 | EXPORT_SYMBOL(cpufreq_quick_get_max); | |
1603 | ||
d92d50a4 | 1604 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
1da177e4 | 1605 | { |
e08f5f5b | 1606 | unsigned int ret_freq = 0; |
5800043b | 1607 | |
1c3d85dd | 1608 | if (!cpufreq_driver->get) |
4d34a67d | 1609 | return ret_freq; |
1da177e4 | 1610 | |
d92d50a4 | 1611 | ret_freq = cpufreq_driver->get(policy->cpu); |
1da177e4 | 1612 | |
e08f5f5b | 1613 | if (ret_freq && policy->cur && |
1c3d85dd | 1614 | !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e08f5f5b GS |
1615 | /* verify no discrepancy between actual and |
1616 | saved value exists */ | |
1617 | if (unlikely(ret_freq != policy->cur)) { | |
a1e1dc41 | 1618 | cpufreq_out_of_sync(policy, ret_freq); |
1da177e4 LT |
1619 | schedule_work(&policy->update); |
1620 | } | |
1621 | } | |
1622 | ||
4d34a67d | 1623 | return ret_freq; |
5a01f2e8 | 1624 | } |
1da177e4 | 1625 | |
5a01f2e8 VP |
1626 | /** |
1627 | * cpufreq_get - get the current CPU frequency (in kHz) | |
1628 | * @cpu: CPU number | |
1629 | * | |
1630 | * Get the CPU current (static) CPU frequency | |
1631 | */ | |
1632 | unsigned int cpufreq_get(unsigned int cpu) | |
1633 | { | |
999976e0 | 1634 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
5a01f2e8 | 1635 | unsigned int ret_freq = 0; |
5a01f2e8 | 1636 | |
999976e0 AP |
1637 | if (policy) { |
1638 | down_read(&policy->rwsem); | |
d92d50a4 | 1639 | ret_freq = __cpufreq_get(policy); |
999976e0 | 1640 | up_read(&policy->rwsem); |
5a01f2e8 | 1641 | |
999976e0 AP |
1642 | cpufreq_cpu_put(policy); |
1643 | } | |
6eed9404 | 1644 | |
4d34a67d | 1645 | return ret_freq; |
1da177e4 LT |
1646 | } |
1647 | EXPORT_SYMBOL(cpufreq_get); | |
1648 | ||
8a25a2fd KS |
1649 | static struct subsys_interface cpufreq_interface = { |
1650 | .name = "cpufreq", | |
1651 | .subsys = &cpu_subsys, | |
1652 | .add_dev = cpufreq_add_dev, | |
1653 | .remove_dev = cpufreq_remove_dev, | |
e00e56df RW |
1654 | }; |
1655 | ||
e28867ea VK |
1656 | /* |
1657 | * In case platform wants some specific frequency to be configured | |
1658 | * during suspend.. | |
1659 | */ | |
1660 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) | |
1661 | { | |
1662 | int ret; | |
1663 | ||
1664 | if (!policy->suspend_freq) { | |
1665 | pr_err("%s: suspend_freq can't be zero\n", __func__); | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | ||
1669 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, | |
1670 | policy->suspend_freq); | |
1671 | ||
1672 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, | |
1673 | CPUFREQ_RELATION_H); | |
1674 | if (ret) | |
1675 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", | |
1676 | __func__, policy->suspend_freq, ret); | |
1677 | ||
1678 | return ret; | |
1679 | } | |
1680 | EXPORT_SYMBOL(cpufreq_generic_suspend); | |
1681 | ||
42d4dc3f | 1682 | /** |
2f0aea93 | 1683 | * cpufreq_suspend() - Suspend CPUFreq governors |
e00e56df | 1684 | * |
2f0aea93 VK |
1685 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
1686 | * as some platforms can't change frequency after this point in suspend cycle. | |
1687 | * Because some of the devices (like: i2c, regulators, etc) they use for | |
1688 | * changing frequency are suspended quickly after this point. | |
42d4dc3f | 1689 | */ |
2f0aea93 | 1690 | void cpufreq_suspend(void) |
42d4dc3f | 1691 | { |
3a3e9e06 | 1692 | struct cpufreq_policy *policy; |
42d4dc3f | 1693 | |
2f0aea93 VK |
1694 | if (!cpufreq_driver) |
1695 | return; | |
42d4dc3f | 1696 | |
2f0aea93 | 1697 | if (!has_target()) |
b1b12bab | 1698 | goto suspend; |
42d4dc3f | 1699 | |
2f0aea93 VK |
1700 | pr_debug("%s: Suspending Governors\n", __func__); |
1701 | ||
f963735a | 1702 | for_each_active_policy(policy) { |
2f0aea93 VK |
1703 | if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) |
1704 | pr_err("%s: Failed to stop governor for policy: %p\n", | |
1705 | __func__, policy); | |
1706 | else if (cpufreq_driver->suspend | |
1707 | && cpufreq_driver->suspend(policy)) | |
1708 | pr_err("%s: Failed to suspend driver: %p\n", __func__, | |
1709 | policy); | |
42d4dc3f | 1710 | } |
b1b12bab VK |
1711 | |
1712 | suspend: | |
1713 | cpufreq_suspended = true; | |
42d4dc3f BH |
1714 | } |
1715 | ||
1da177e4 | 1716 | /** |
2f0aea93 | 1717 | * cpufreq_resume() - Resume CPUFreq governors |
1da177e4 | 1718 | * |
2f0aea93 VK |
1719 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
1720 | * are suspended with cpufreq_suspend(). | |
1da177e4 | 1721 | */ |
2f0aea93 | 1722 | void cpufreq_resume(void) |
1da177e4 | 1723 | { |
3a3e9e06 | 1724 | struct cpufreq_policy *policy; |
1da177e4 | 1725 | |
2f0aea93 VK |
1726 | if (!cpufreq_driver) |
1727 | return; | |
1da177e4 | 1728 | |
8e30444e LT |
1729 | cpufreq_suspended = false; |
1730 | ||
2f0aea93 | 1731 | if (!has_target()) |
e00e56df | 1732 | return; |
1da177e4 | 1733 | |
2f0aea93 | 1734 | pr_debug("%s: Resuming Governors\n", __func__); |
1da177e4 | 1735 | |
f963735a | 1736 | for_each_active_policy(policy) { |
0c5aa405 VK |
1737 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) |
1738 | pr_err("%s: Failed to resume driver: %p\n", __func__, | |
1739 | policy); | |
1740 | else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) | |
2f0aea93 VK |
1741 | || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) |
1742 | pr_err("%s: Failed to start governor for policy: %p\n", | |
1743 | __func__, policy); | |
2f0aea93 | 1744 | } |
c75de0ac VK |
1745 | |
1746 | /* | |
1747 | * schedule call cpufreq_update_policy() for first-online CPU, as that | |
1748 | * wouldn't be hotplugged-out on suspend. It will verify that the | |
1749 | * current freq is in sync with what we believe it to be. | |
1750 | */ | |
1751 | policy = cpufreq_cpu_get_raw(cpumask_first(cpu_online_mask)); | |
1752 | if (WARN_ON(!policy)) | |
1753 | return; | |
1754 | ||
1755 | schedule_work(&policy->update); | |
2f0aea93 | 1756 | } |
1da177e4 | 1757 | |
9d95046e BP |
1758 | /** |
1759 | * cpufreq_get_current_driver - return current driver's name | |
1760 | * | |
1761 | * Return the name string of the currently loaded cpufreq driver | |
1762 | * or NULL, if none. | |
1763 | */ | |
1764 | const char *cpufreq_get_current_driver(void) | |
1765 | { | |
1c3d85dd RW |
1766 | if (cpufreq_driver) |
1767 | return cpufreq_driver->name; | |
1768 | ||
1769 | return NULL; | |
9d95046e BP |
1770 | } |
1771 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); | |
1da177e4 | 1772 | |
51315cdf TP |
1773 | /** |
1774 | * cpufreq_get_driver_data - return current driver data | |
1775 | * | |
1776 | * Return the private data of the currently loaded cpufreq | |
1777 | * driver, or NULL if no cpufreq driver is loaded. | |
1778 | */ | |
1779 | void *cpufreq_get_driver_data(void) | |
1780 | { | |
1781 | if (cpufreq_driver) | |
1782 | return cpufreq_driver->driver_data; | |
1783 | ||
1784 | return NULL; | |
1785 | } | |
1786 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); | |
1787 | ||
1da177e4 LT |
1788 | /********************************************************************* |
1789 | * NOTIFIER LISTS INTERFACE * | |
1790 | *********************************************************************/ | |
1791 | ||
1792 | /** | |
1793 | * cpufreq_register_notifier - register a driver with cpufreq | |
1794 | * @nb: notifier function to register | |
1795 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER | |
1796 | * | |
32ee8c3e | 1797 | * Add a driver to one of two lists: either a list of drivers that |
1da177e4 LT |
1798 | * are notified about clock rate changes (once before and once after |
1799 | * the transition), or a list of drivers that are notified about | |
1800 | * changes in cpufreq policy. | |
1801 | * | |
1802 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1803 | * blocking_notifier_chain_register. |
1da177e4 LT |
1804 | */ |
1805 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) | |
1806 | { | |
1807 | int ret; | |
1808 | ||
d5aaffa9 DB |
1809 | if (cpufreq_disabled()) |
1810 | return -EINVAL; | |
1811 | ||
74212ca4 CEB |
1812 | WARN_ON(!init_cpufreq_transition_notifier_list_called); |
1813 | ||
1da177e4 LT |
1814 | switch (list) { |
1815 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1816 | ret = srcu_notifier_chain_register( |
e041c683 | 1817 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1818 | break; |
1819 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1820 | ret = blocking_notifier_chain_register( |
1821 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1822 | break; |
1823 | default: | |
1824 | ret = -EINVAL; | |
1825 | } | |
1da177e4 LT |
1826 | |
1827 | return ret; | |
1828 | } | |
1829 | EXPORT_SYMBOL(cpufreq_register_notifier); | |
1830 | ||
1da177e4 LT |
1831 | /** |
1832 | * cpufreq_unregister_notifier - unregister a driver with cpufreq | |
1833 | * @nb: notifier block to be unregistered | |
bb176f7d | 1834 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
1da177e4 LT |
1835 | * |
1836 | * Remove a driver from the CPU frequency notifier list. | |
1837 | * | |
1838 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1839 | * blocking_notifier_chain_unregister. |
1da177e4 LT |
1840 | */ |
1841 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) | |
1842 | { | |
1843 | int ret; | |
1844 | ||
d5aaffa9 DB |
1845 | if (cpufreq_disabled()) |
1846 | return -EINVAL; | |
1847 | ||
1da177e4 LT |
1848 | switch (list) { |
1849 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1850 | ret = srcu_notifier_chain_unregister( |
e041c683 | 1851 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1852 | break; |
1853 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1854 | ret = blocking_notifier_chain_unregister( |
1855 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1856 | break; |
1857 | default: | |
1858 | ret = -EINVAL; | |
1859 | } | |
1da177e4 LT |
1860 | |
1861 | return ret; | |
1862 | } | |
1863 | EXPORT_SYMBOL(cpufreq_unregister_notifier); | |
1864 | ||
1865 | ||
1866 | /********************************************************************* | |
1867 | * GOVERNORS * | |
1868 | *********************************************************************/ | |
1869 | ||
1c03a2d0 VK |
1870 | /* Must set freqs->new to intermediate frequency */ |
1871 | static int __target_intermediate(struct cpufreq_policy *policy, | |
1872 | struct cpufreq_freqs *freqs, int index) | |
1873 | { | |
1874 | int ret; | |
1875 | ||
1876 | freqs->new = cpufreq_driver->get_intermediate(policy, index); | |
1877 | ||
1878 | /* We don't need to switch to intermediate freq */ | |
1879 | if (!freqs->new) | |
1880 | return 0; | |
1881 | ||
1882 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", | |
1883 | __func__, policy->cpu, freqs->old, freqs->new); | |
1884 | ||
1885 | cpufreq_freq_transition_begin(policy, freqs); | |
1886 | ret = cpufreq_driver->target_intermediate(policy, index); | |
1887 | cpufreq_freq_transition_end(policy, freqs, ret); | |
1888 | ||
1889 | if (ret) | |
1890 | pr_err("%s: Failed to change to intermediate frequency: %d\n", | |
1891 | __func__, ret); | |
1892 | ||
1893 | return ret; | |
1894 | } | |
1895 | ||
8d65775d VK |
1896 | static int __target_index(struct cpufreq_policy *policy, |
1897 | struct cpufreq_frequency_table *freq_table, int index) | |
1898 | { | |
1c03a2d0 VK |
1899 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
1900 | unsigned int intermediate_freq = 0; | |
8d65775d VK |
1901 | int retval = -EINVAL; |
1902 | bool notify; | |
1903 | ||
1904 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); | |
8d65775d | 1905 | if (notify) { |
1c03a2d0 VK |
1906 | /* Handle switching to intermediate frequency */ |
1907 | if (cpufreq_driver->get_intermediate) { | |
1908 | retval = __target_intermediate(policy, &freqs, index); | |
1909 | if (retval) | |
1910 | return retval; | |
1911 | ||
1912 | intermediate_freq = freqs.new; | |
1913 | /* Set old freq to intermediate */ | |
1914 | if (intermediate_freq) | |
1915 | freqs.old = freqs.new; | |
1916 | } | |
8d65775d | 1917 | |
1c03a2d0 | 1918 | freqs.new = freq_table[index].frequency; |
8d65775d VK |
1919 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
1920 | __func__, policy->cpu, freqs.old, freqs.new); | |
1921 | ||
1922 | cpufreq_freq_transition_begin(policy, &freqs); | |
1923 | } | |
1924 | ||
1925 | retval = cpufreq_driver->target_index(policy, index); | |
1926 | if (retval) | |
1927 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, | |
1928 | retval); | |
1929 | ||
1c03a2d0 | 1930 | if (notify) { |
8d65775d VK |
1931 | cpufreq_freq_transition_end(policy, &freqs, retval); |
1932 | ||
1c03a2d0 VK |
1933 | /* |
1934 | * Failed after setting to intermediate freq? Driver should have | |
1935 | * reverted back to initial frequency and so should we. Check | |
1936 | * here for intermediate_freq instead of get_intermediate, in | |
1937 | * case we have't switched to intermediate freq at all. | |
1938 | */ | |
1939 | if (unlikely(retval && intermediate_freq)) { | |
1940 | freqs.old = intermediate_freq; | |
1941 | freqs.new = policy->restore_freq; | |
1942 | cpufreq_freq_transition_begin(policy, &freqs); | |
1943 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1944 | } | |
1945 | } | |
1946 | ||
8d65775d VK |
1947 | return retval; |
1948 | } | |
1949 | ||
1da177e4 LT |
1950 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
1951 | unsigned int target_freq, | |
1952 | unsigned int relation) | |
1953 | { | |
7249924e | 1954 | unsigned int old_target_freq = target_freq; |
8d65775d | 1955 | int retval = -EINVAL; |
c32b6b8e | 1956 | |
a7b422cd KRW |
1957 | if (cpufreq_disabled()) |
1958 | return -ENODEV; | |
1959 | ||
7249924e VK |
1960 | /* Make sure that target_freq is within supported range */ |
1961 | if (target_freq > policy->max) | |
1962 | target_freq = policy->max; | |
1963 | if (target_freq < policy->min) | |
1964 | target_freq = policy->min; | |
1965 | ||
1966 | pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", | |
e837f9b5 | 1967 | policy->cpu, target_freq, relation, old_target_freq); |
5a1c0228 | 1968 | |
9c0ebcf7 VK |
1969 | /* |
1970 | * This might look like a redundant call as we are checking it again | |
1971 | * after finding index. But it is left intentionally for cases where | |
1972 | * exactly same freq is called again and so we can save on few function | |
1973 | * calls. | |
1974 | */ | |
5a1c0228 VK |
1975 | if (target_freq == policy->cur) |
1976 | return 0; | |
1977 | ||
1c03a2d0 VK |
1978 | /* Save last value to restore later on errors */ |
1979 | policy->restore_freq = policy->cur; | |
1980 | ||
1c3d85dd RW |
1981 | if (cpufreq_driver->target) |
1982 | retval = cpufreq_driver->target(policy, target_freq, relation); | |
9c0ebcf7 VK |
1983 | else if (cpufreq_driver->target_index) { |
1984 | struct cpufreq_frequency_table *freq_table; | |
1985 | int index; | |
90d45d17 | 1986 | |
9c0ebcf7 VK |
1987 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
1988 | if (unlikely(!freq_table)) { | |
1989 | pr_err("%s: Unable to find freq_table\n", __func__); | |
1990 | goto out; | |
1991 | } | |
1992 | ||
1993 | retval = cpufreq_frequency_table_target(policy, freq_table, | |
1994 | target_freq, relation, &index); | |
1995 | if (unlikely(retval)) { | |
1996 | pr_err("%s: Unable to find matching freq\n", __func__); | |
1997 | goto out; | |
1998 | } | |
1999 | ||
d4019f0a | 2000 | if (freq_table[index].frequency == policy->cur) { |
9c0ebcf7 | 2001 | retval = 0; |
d4019f0a VK |
2002 | goto out; |
2003 | } | |
2004 | ||
8d65775d | 2005 | retval = __target_index(policy, freq_table, index); |
9c0ebcf7 VK |
2006 | } |
2007 | ||
2008 | out: | |
1da177e4 LT |
2009 | return retval; |
2010 | } | |
2011 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); | |
2012 | ||
1da177e4 LT |
2013 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
2014 | unsigned int target_freq, | |
2015 | unsigned int relation) | |
2016 | { | |
f1829e4a | 2017 | int ret = -EINVAL; |
1da177e4 | 2018 | |
ad7722da | 2019 | down_write(&policy->rwsem); |
1da177e4 LT |
2020 | |
2021 | ret = __cpufreq_driver_target(policy, target_freq, relation); | |
2022 | ||
ad7722da | 2023 | up_write(&policy->rwsem); |
1da177e4 | 2024 | |
1da177e4 LT |
2025 | return ret; |
2026 | } | |
2027 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); | |
2028 | ||
e08f5f5b GS |
2029 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
2030 | unsigned int event) | |
1da177e4 | 2031 | { |
cc993cab | 2032 | int ret; |
6afde10c TR |
2033 | |
2034 | /* Only must be defined when default governor is known to have latency | |
2035 | restrictions, like e.g. conservative or ondemand. | |
2036 | That this is the case is already ensured in Kconfig | |
2037 | */ | |
2038 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE | |
2039 | struct cpufreq_governor *gov = &cpufreq_gov_performance; | |
2040 | #else | |
2041 | struct cpufreq_governor *gov = NULL; | |
2042 | #endif | |
1c256245 | 2043 | |
2f0aea93 VK |
2044 | /* Don't start any governor operations if we are entering suspend */ |
2045 | if (cpufreq_suspended) | |
2046 | return 0; | |
cb57720b EZ |
2047 | /* |
2048 | * Governor might not be initiated here if ACPI _PPC changed | |
2049 | * notification happened, so check it. | |
2050 | */ | |
2051 | if (!policy->governor) | |
2052 | return -EINVAL; | |
2f0aea93 | 2053 | |
1c256245 TR |
2054 | if (policy->governor->max_transition_latency && |
2055 | policy->cpuinfo.transition_latency > | |
2056 | policy->governor->max_transition_latency) { | |
6afde10c TR |
2057 | if (!gov) |
2058 | return -EINVAL; | |
2059 | else { | |
e837f9b5 JP |
2060 | pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", |
2061 | policy->governor->name, gov->name); | |
6afde10c TR |
2062 | policy->governor = gov; |
2063 | } | |
1c256245 | 2064 | } |
1da177e4 | 2065 | |
fe492f3f VK |
2066 | if (event == CPUFREQ_GOV_POLICY_INIT) |
2067 | if (!try_module_get(policy->governor->owner)) | |
2068 | return -EINVAL; | |
1da177e4 | 2069 | |
2d06d8c4 | 2070 | pr_debug("__cpufreq_governor for CPU %u, event %u\n", |
e837f9b5 | 2071 | policy->cpu, event); |
95731ebb XC |
2072 | |
2073 | mutex_lock(&cpufreq_governor_lock); | |
56d07db2 | 2074 | if ((policy->governor_enabled && event == CPUFREQ_GOV_START) |
f73d3933 VK |
2075 | || (!policy->governor_enabled |
2076 | && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { | |
95731ebb XC |
2077 | mutex_unlock(&cpufreq_governor_lock); |
2078 | return -EBUSY; | |
2079 | } | |
2080 | ||
2081 | if (event == CPUFREQ_GOV_STOP) | |
2082 | policy->governor_enabled = false; | |
2083 | else if (event == CPUFREQ_GOV_START) | |
2084 | policy->governor_enabled = true; | |
2085 | ||
2086 | mutex_unlock(&cpufreq_governor_lock); | |
2087 | ||
1da177e4 LT |
2088 | ret = policy->governor->governor(policy, event); |
2089 | ||
4d5dcc42 VK |
2090 | if (!ret) { |
2091 | if (event == CPUFREQ_GOV_POLICY_INIT) | |
2092 | policy->governor->initialized++; | |
2093 | else if (event == CPUFREQ_GOV_POLICY_EXIT) | |
2094 | policy->governor->initialized--; | |
95731ebb XC |
2095 | } else { |
2096 | /* Restore original values */ | |
2097 | mutex_lock(&cpufreq_governor_lock); | |
2098 | if (event == CPUFREQ_GOV_STOP) | |
2099 | policy->governor_enabled = true; | |
2100 | else if (event == CPUFREQ_GOV_START) | |
2101 | policy->governor_enabled = false; | |
2102 | mutex_unlock(&cpufreq_governor_lock); | |
4d5dcc42 | 2103 | } |
b394058f | 2104 | |
fe492f3f VK |
2105 | if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || |
2106 | ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret)) | |
1da177e4 LT |
2107 | module_put(policy->governor->owner); |
2108 | ||
2109 | return ret; | |
2110 | } | |
2111 | ||
1da177e4 LT |
2112 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
2113 | { | |
3bcb09a3 | 2114 | int err; |
1da177e4 LT |
2115 | |
2116 | if (!governor) | |
2117 | return -EINVAL; | |
2118 | ||
a7b422cd KRW |
2119 | if (cpufreq_disabled()) |
2120 | return -ENODEV; | |
2121 | ||
3fc54d37 | 2122 | mutex_lock(&cpufreq_governor_mutex); |
32ee8c3e | 2123 | |
b394058f | 2124 | governor->initialized = 0; |
3bcb09a3 | 2125 | err = -EBUSY; |
42f91fa1 | 2126 | if (!find_governor(governor->name)) { |
3bcb09a3 JF |
2127 | err = 0; |
2128 | list_add(&governor->governor_list, &cpufreq_governor_list); | |
1da177e4 | 2129 | } |
1da177e4 | 2130 | |
32ee8c3e | 2131 | mutex_unlock(&cpufreq_governor_mutex); |
3bcb09a3 | 2132 | return err; |
1da177e4 LT |
2133 | } |
2134 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); | |
2135 | ||
1da177e4 LT |
2136 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
2137 | { | |
90e41bac | 2138 | int cpu; |
90e41bac | 2139 | |
1da177e4 LT |
2140 | if (!governor) |
2141 | return; | |
2142 | ||
a7b422cd KRW |
2143 | if (cpufreq_disabled()) |
2144 | return; | |
2145 | ||
90e41bac PB |
2146 | for_each_present_cpu(cpu) { |
2147 | if (cpu_online(cpu)) | |
2148 | continue; | |
2149 | if (!strcmp(per_cpu(cpufreq_cpu_governor, cpu), governor->name)) | |
2150 | strcpy(per_cpu(cpufreq_cpu_governor, cpu), "\0"); | |
2151 | } | |
90e41bac | 2152 | |
3fc54d37 | 2153 | mutex_lock(&cpufreq_governor_mutex); |
1da177e4 | 2154 | list_del(&governor->governor_list); |
3fc54d37 | 2155 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 LT |
2156 | return; |
2157 | } | |
2158 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); | |
2159 | ||
2160 | ||
1da177e4 LT |
2161 | /********************************************************************* |
2162 | * POLICY INTERFACE * | |
2163 | *********************************************************************/ | |
2164 | ||
2165 | /** | |
2166 | * cpufreq_get_policy - get the current cpufreq_policy | |
29464f28 DJ |
2167 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
2168 | * is written | |
1da177e4 LT |
2169 | * |
2170 | * Reads the current cpufreq policy. | |
2171 | */ | |
2172 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) | |
2173 | { | |
2174 | struct cpufreq_policy *cpu_policy; | |
2175 | if (!policy) | |
2176 | return -EINVAL; | |
2177 | ||
2178 | cpu_policy = cpufreq_cpu_get(cpu); | |
2179 | if (!cpu_policy) | |
2180 | return -EINVAL; | |
2181 | ||
d5b73cd8 | 2182 | memcpy(policy, cpu_policy, sizeof(*policy)); |
1da177e4 LT |
2183 | |
2184 | cpufreq_cpu_put(cpu_policy); | |
1da177e4 LT |
2185 | return 0; |
2186 | } | |
2187 | EXPORT_SYMBOL(cpufreq_get_policy); | |
2188 | ||
153d7f3f | 2189 | /* |
037ce839 VK |
2190 | * policy : current policy. |
2191 | * new_policy: policy to be set. | |
153d7f3f | 2192 | */ |
037ce839 | 2193 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 2194 | struct cpufreq_policy *new_policy) |
1da177e4 | 2195 | { |
d9a789c7 RW |
2196 | struct cpufreq_governor *old_gov; |
2197 | int ret; | |
1da177e4 | 2198 | |
e837f9b5 JP |
2199 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
2200 | new_policy->cpu, new_policy->min, new_policy->max); | |
1da177e4 | 2201 | |
d5b73cd8 | 2202 | memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
1da177e4 | 2203 | |
d9a789c7 RW |
2204 | if (new_policy->min > policy->max || new_policy->max < policy->min) |
2205 | return -EINVAL; | |
9c9a43ed | 2206 | |
1da177e4 | 2207 | /* verify the cpu speed can be set within this limit */ |
3a3e9e06 | 2208 | ret = cpufreq_driver->verify(new_policy); |
1da177e4 | 2209 | if (ret) |
d9a789c7 | 2210 | return ret; |
1da177e4 | 2211 | |
1da177e4 | 2212 | /* adjust if necessary - all reasons */ |
e041c683 | 2213 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2214 | CPUFREQ_ADJUST, new_policy); |
1da177e4 LT |
2215 | |
2216 | /* adjust if necessary - hardware incompatibility*/ | |
e041c683 | 2217 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2218 | CPUFREQ_INCOMPATIBLE, new_policy); |
1da177e4 | 2219 | |
bb176f7d VK |
2220 | /* |
2221 | * verify the cpu speed can be set within this limit, which might be | |
2222 | * different to the first one | |
2223 | */ | |
3a3e9e06 | 2224 | ret = cpufreq_driver->verify(new_policy); |
e041c683 | 2225 | if (ret) |
d9a789c7 | 2226 | return ret; |
1da177e4 LT |
2227 | |
2228 | /* notification of the new policy */ | |
e041c683 | 2229 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2230 | CPUFREQ_NOTIFY, new_policy); |
1da177e4 | 2231 | |
3a3e9e06 VK |
2232 | policy->min = new_policy->min; |
2233 | policy->max = new_policy->max; | |
1da177e4 | 2234 | |
2d06d8c4 | 2235 | pr_debug("new min and max freqs are %u - %u kHz\n", |
e837f9b5 | 2236 | policy->min, policy->max); |
1da177e4 | 2237 | |
1c3d85dd | 2238 | if (cpufreq_driver->setpolicy) { |
3a3e9e06 | 2239 | policy->policy = new_policy->policy; |
2d06d8c4 | 2240 | pr_debug("setting range\n"); |
d9a789c7 RW |
2241 | return cpufreq_driver->setpolicy(new_policy); |
2242 | } | |
1da177e4 | 2243 | |
d9a789c7 RW |
2244 | if (new_policy->governor == policy->governor) |
2245 | goto out; | |
7bd353a9 | 2246 | |
d9a789c7 RW |
2247 | pr_debug("governor switch\n"); |
2248 | ||
2249 | /* save old, working values */ | |
2250 | old_gov = policy->governor; | |
2251 | /* end old governor */ | |
2252 | if (old_gov) { | |
2253 | __cpufreq_governor(policy, CPUFREQ_GOV_STOP); | |
2254 | up_write(&policy->rwsem); | |
e5c87b76 | 2255 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
d9a789c7 | 2256 | down_write(&policy->rwsem); |
1da177e4 LT |
2257 | } |
2258 | ||
d9a789c7 RW |
2259 | /* start new governor */ |
2260 | policy->governor = new_policy->governor; | |
2261 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { | |
2262 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) | |
2263 | goto out; | |
2264 | ||
2265 | up_write(&policy->rwsem); | |
2266 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); | |
2267 | down_write(&policy->rwsem); | |
2268 | } | |
2269 | ||
2270 | /* new governor failed, so re-start old one */ | |
2271 | pr_debug("starting governor %s failed\n", policy->governor->name); | |
2272 | if (old_gov) { | |
2273 | policy->governor = old_gov; | |
2274 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); | |
2275 | __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
2276 | } | |
2277 | ||
2278 | return -EINVAL; | |
2279 | ||
2280 | out: | |
2281 | pr_debug("governor: change or update limits\n"); | |
2282 | return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1da177e4 LT |
2283 | } |
2284 | ||
1da177e4 LT |
2285 | /** |
2286 | * cpufreq_update_policy - re-evaluate an existing cpufreq policy | |
2287 | * @cpu: CPU which shall be re-evaluated | |
2288 | * | |
25985edc | 2289 | * Useful for policy notifiers which have different necessities |
1da177e4 LT |
2290 | * at different times. |
2291 | */ | |
2292 | int cpufreq_update_policy(unsigned int cpu) | |
2293 | { | |
3a3e9e06 VK |
2294 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
2295 | struct cpufreq_policy new_policy; | |
f1829e4a | 2296 | int ret; |
1da177e4 | 2297 | |
fefa8ff8 AP |
2298 | if (!policy) |
2299 | return -ENODEV; | |
1da177e4 | 2300 | |
ad7722da | 2301 | down_write(&policy->rwsem); |
1da177e4 | 2302 | |
2d06d8c4 | 2303 | pr_debug("updating policy for CPU %u\n", cpu); |
d5b73cd8 | 2304 | memcpy(&new_policy, policy, sizeof(*policy)); |
3a3e9e06 VK |
2305 | new_policy.min = policy->user_policy.min; |
2306 | new_policy.max = policy->user_policy.max; | |
2307 | new_policy.policy = policy->user_policy.policy; | |
2308 | new_policy.governor = policy->user_policy.governor; | |
1da177e4 | 2309 | |
bb176f7d VK |
2310 | /* |
2311 | * BIOS might change freq behind our back | |
2312 | * -> ask driver for current freq and notify governors about a change | |
2313 | */ | |
2ed99e39 | 2314 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
3a3e9e06 | 2315 | new_policy.cur = cpufreq_driver->get(cpu); |
bd0fa9bb VK |
2316 | if (WARN_ON(!new_policy.cur)) { |
2317 | ret = -EIO; | |
fefa8ff8 | 2318 | goto unlock; |
bd0fa9bb VK |
2319 | } |
2320 | ||
3a3e9e06 | 2321 | if (!policy->cur) { |
e837f9b5 | 2322 | pr_debug("Driver did not initialize current freq\n"); |
3a3e9e06 | 2323 | policy->cur = new_policy.cur; |
a85f7bd3 | 2324 | } else { |
9c0ebcf7 | 2325 | if (policy->cur != new_policy.cur && has_target()) |
a1e1dc41 | 2326 | cpufreq_out_of_sync(policy, new_policy.cur); |
a85f7bd3 | 2327 | } |
0961dd0d TR |
2328 | } |
2329 | ||
037ce839 | 2330 | ret = cpufreq_set_policy(policy, &new_policy); |
1da177e4 | 2331 | |
fefa8ff8 | 2332 | unlock: |
ad7722da | 2333 | up_write(&policy->rwsem); |
5a01f2e8 | 2334 | |
3a3e9e06 | 2335 | cpufreq_cpu_put(policy); |
1da177e4 LT |
2336 | return ret; |
2337 | } | |
2338 | EXPORT_SYMBOL(cpufreq_update_policy); | |
2339 | ||
2760984f | 2340 | static int cpufreq_cpu_callback(struct notifier_block *nfb, |
c32b6b8e AR |
2341 | unsigned long action, void *hcpu) |
2342 | { | |
2343 | unsigned int cpu = (unsigned long)hcpu; | |
8a25a2fd | 2344 | struct device *dev; |
c32b6b8e | 2345 | |
8a25a2fd KS |
2346 | dev = get_cpu_device(cpu); |
2347 | if (dev) { | |
5302c3fb | 2348 | switch (action & ~CPU_TASKS_FROZEN) { |
c32b6b8e | 2349 | case CPU_ONLINE: |
23faf0b7 | 2350 | cpufreq_add_dev(dev, NULL); |
c32b6b8e | 2351 | break; |
5302c3fb | 2352 | |
c32b6b8e | 2353 | case CPU_DOWN_PREPARE: |
96bbbe4a | 2354 | __cpufreq_remove_dev_prepare(dev, NULL); |
1aee40ac SB |
2355 | break; |
2356 | ||
2357 | case CPU_POST_DEAD: | |
96bbbe4a | 2358 | __cpufreq_remove_dev_finish(dev, NULL); |
c32b6b8e | 2359 | break; |
5302c3fb | 2360 | |
5a01f2e8 | 2361 | case CPU_DOWN_FAILED: |
23faf0b7 | 2362 | cpufreq_add_dev(dev, NULL); |
c32b6b8e AR |
2363 | break; |
2364 | } | |
2365 | } | |
2366 | return NOTIFY_OK; | |
2367 | } | |
2368 | ||
9c36f746 | 2369 | static struct notifier_block __refdata cpufreq_cpu_notifier = { |
bb176f7d | 2370 | .notifier_call = cpufreq_cpu_callback, |
c32b6b8e | 2371 | }; |
1da177e4 | 2372 | |
6f19efc0 LM |
2373 | /********************************************************************* |
2374 | * BOOST * | |
2375 | *********************************************************************/ | |
2376 | static int cpufreq_boost_set_sw(int state) | |
2377 | { | |
2378 | struct cpufreq_frequency_table *freq_table; | |
2379 | struct cpufreq_policy *policy; | |
2380 | int ret = -EINVAL; | |
2381 | ||
f963735a | 2382 | for_each_active_policy(policy) { |
6f19efc0 LM |
2383 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
2384 | if (freq_table) { | |
2385 | ret = cpufreq_frequency_table_cpuinfo(policy, | |
2386 | freq_table); | |
2387 | if (ret) { | |
2388 | pr_err("%s: Policy frequency update failed\n", | |
2389 | __func__); | |
2390 | break; | |
2391 | } | |
2392 | policy->user_policy.max = policy->max; | |
2393 | __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
2394 | } | |
2395 | } | |
2396 | ||
2397 | return ret; | |
2398 | } | |
2399 | ||
2400 | int cpufreq_boost_trigger_state(int state) | |
2401 | { | |
2402 | unsigned long flags; | |
2403 | int ret = 0; | |
2404 | ||
2405 | if (cpufreq_driver->boost_enabled == state) | |
2406 | return 0; | |
2407 | ||
2408 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2409 | cpufreq_driver->boost_enabled = state; | |
2410 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2411 | ||
2412 | ret = cpufreq_driver->set_boost(state); | |
2413 | if (ret) { | |
2414 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2415 | cpufreq_driver->boost_enabled = !state; | |
2416 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2417 | ||
e837f9b5 JP |
2418 | pr_err("%s: Cannot %s BOOST\n", |
2419 | __func__, state ? "enable" : "disable"); | |
6f19efc0 LM |
2420 | } |
2421 | ||
2422 | return ret; | |
2423 | } | |
2424 | ||
2425 | int cpufreq_boost_supported(void) | |
2426 | { | |
2427 | if (likely(cpufreq_driver)) | |
2428 | return cpufreq_driver->boost_supported; | |
2429 | ||
2430 | return 0; | |
2431 | } | |
2432 | EXPORT_SYMBOL_GPL(cpufreq_boost_supported); | |
2433 | ||
2434 | int cpufreq_boost_enabled(void) | |
2435 | { | |
2436 | return cpufreq_driver->boost_enabled; | |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); | |
2439 | ||
1da177e4 LT |
2440 | /********************************************************************* |
2441 | * REGISTER / UNREGISTER CPUFREQ DRIVER * | |
2442 | *********************************************************************/ | |
2443 | ||
2444 | /** | |
2445 | * cpufreq_register_driver - register a CPU Frequency driver | |
2446 | * @driver_data: A struct cpufreq_driver containing the values# | |
2447 | * submitted by the CPU Frequency driver. | |
2448 | * | |
bb176f7d | 2449 | * Registers a CPU Frequency driver to this core code. This code |
1da177e4 | 2450 | * returns zero on success, -EBUSY when another driver got here first |
32ee8c3e | 2451 | * (and isn't unregistered in the meantime). |
1da177e4 LT |
2452 | * |
2453 | */ | |
221dee28 | 2454 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
1da177e4 LT |
2455 | { |
2456 | unsigned long flags; | |
2457 | int ret; | |
2458 | ||
a7b422cd KRW |
2459 | if (cpufreq_disabled()) |
2460 | return -ENODEV; | |
2461 | ||
1da177e4 | 2462 | if (!driver_data || !driver_data->verify || !driver_data->init || |
9c0ebcf7 | 2463 | !(driver_data->setpolicy || driver_data->target_index || |
9832235f RW |
2464 | driver_data->target) || |
2465 | (driver_data->setpolicy && (driver_data->target_index || | |
1c03a2d0 VK |
2466 | driver_data->target)) || |
2467 | (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) | |
1da177e4 LT |
2468 | return -EINVAL; |
2469 | ||
2d06d8c4 | 2470 | pr_debug("trying to register driver %s\n", driver_data->name); |
1da177e4 | 2471 | |
0d1857a1 | 2472 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2473 | if (cpufreq_driver) { |
0d1857a1 | 2474 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
4dea5806 | 2475 | return -EEXIST; |
1da177e4 | 2476 | } |
1c3d85dd | 2477 | cpufreq_driver = driver_data; |
0d1857a1 | 2478 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 2479 | |
bc68b7df VK |
2480 | if (driver_data->setpolicy) |
2481 | driver_data->flags |= CPUFREQ_CONST_LOOPS; | |
2482 | ||
6f19efc0 LM |
2483 | if (cpufreq_boost_supported()) { |
2484 | /* | |
2485 | * Check if driver provides function to enable boost - | |
2486 | * if not, use cpufreq_boost_set_sw as default | |
2487 | */ | |
2488 | if (!cpufreq_driver->set_boost) | |
2489 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; | |
2490 | ||
2491 | ret = cpufreq_sysfs_create_file(&boost.attr); | |
2492 | if (ret) { | |
2493 | pr_err("%s: cannot register global BOOST sysfs file\n", | |
e837f9b5 | 2494 | __func__); |
6f19efc0 LM |
2495 | goto err_null_driver; |
2496 | } | |
2497 | } | |
2498 | ||
8a25a2fd | 2499 | ret = subsys_interface_register(&cpufreq_interface); |
8f5bc2ab | 2500 | if (ret) |
6f19efc0 | 2501 | goto err_boost_unreg; |
1da177e4 | 2502 | |
ce1bcfe9 VK |
2503 | if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && |
2504 | list_empty(&cpufreq_policy_list)) { | |
1da177e4 | 2505 | /* if all ->init() calls failed, unregister */ |
ce1bcfe9 VK |
2506 | pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
2507 | driver_data->name); | |
2508 | goto err_if_unreg; | |
1da177e4 LT |
2509 | } |
2510 | ||
8f5bc2ab | 2511 | register_hotcpu_notifier(&cpufreq_cpu_notifier); |
2d06d8c4 | 2512 | pr_debug("driver %s up and running\n", driver_data->name); |
1da177e4 | 2513 | |
8f5bc2ab | 2514 | return 0; |
8a25a2fd KS |
2515 | err_if_unreg: |
2516 | subsys_interface_unregister(&cpufreq_interface); | |
6f19efc0 LM |
2517 | err_boost_unreg: |
2518 | if (cpufreq_boost_supported()) | |
2519 | cpufreq_sysfs_remove_file(&boost.attr); | |
8f5bc2ab | 2520 | err_null_driver: |
0d1857a1 | 2521 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2522 | cpufreq_driver = NULL; |
0d1857a1 | 2523 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
4d34a67d | 2524 | return ret; |
1da177e4 LT |
2525 | } |
2526 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); | |
2527 | ||
1da177e4 LT |
2528 | /** |
2529 | * cpufreq_unregister_driver - unregister the current CPUFreq driver | |
2530 | * | |
bb176f7d | 2531 | * Unregister the current CPUFreq driver. Only call this if you have |
1da177e4 LT |
2532 | * the right to do so, i.e. if you have succeeded in initialising before! |
2533 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is | |
2534 | * currently not initialised. | |
2535 | */ | |
221dee28 | 2536 | int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
1da177e4 LT |
2537 | { |
2538 | unsigned long flags; | |
2539 | ||
1c3d85dd | 2540 | if (!cpufreq_driver || (driver != cpufreq_driver)) |
1da177e4 | 2541 | return -EINVAL; |
1da177e4 | 2542 | |
2d06d8c4 | 2543 | pr_debug("unregistering driver %s\n", driver->name); |
1da177e4 | 2544 | |
8a25a2fd | 2545 | subsys_interface_unregister(&cpufreq_interface); |
6f19efc0 LM |
2546 | if (cpufreq_boost_supported()) |
2547 | cpufreq_sysfs_remove_file(&boost.attr); | |
2548 | ||
65edc68c | 2549 | unregister_hotcpu_notifier(&cpufreq_cpu_notifier); |
1da177e4 | 2550 | |
6eed9404 | 2551 | down_write(&cpufreq_rwsem); |
0d1857a1 | 2552 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
6eed9404 | 2553 | |
1c3d85dd | 2554 | cpufreq_driver = NULL; |
6eed9404 | 2555 | |
0d1857a1 | 2556 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
6eed9404 | 2557 | up_write(&cpufreq_rwsem); |
1da177e4 LT |
2558 | |
2559 | return 0; | |
2560 | } | |
2561 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); | |
5a01f2e8 | 2562 | |
90de2a4a DA |
2563 | /* |
2564 | * Stop cpufreq at shutdown to make sure it isn't holding any locks | |
2565 | * or mutexes when secondary CPUs are halted. | |
2566 | */ | |
2567 | static struct syscore_ops cpufreq_syscore_ops = { | |
2568 | .shutdown = cpufreq_suspend, | |
2569 | }; | |
2570 | ||
5a01f2e8 VP |
2571 | static int __init cpufreq_core_init(void) |
2572 | { | |
a7b422cd KRW |
2573 | if (cpufreq_disabled()) |
2574 | return -ENODEV; | |
2575 | ||
2361be23 | 2576 | cpufreq_global_kobject = kobject_create(); |
8aa84ad8 TR |
2577 | BUG_ON(!cpufreq_global_kobject); |
2578 | ||
90de2a4a DA |
2579 | register_syscore_ops(&cpufreq_syscore_ops); |
2580 | ||
5a01f2e8 VP |
2581 | return 0; |
2582 | } | |
5a01f2e8 | 2583 | core_initcall(cpufreq_core_init); |