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 | |
2f0aea93 VK |
107 | /* Flag to suspend/resume CPUFreq governors */ |
108 | static bool cpufreq_suspended; | |
1da177e4 | 109 | |
9c0ebcf7 VK |
110 | static inline bool has_target(void) |
111 | { | |
112 | return cpufreq_driver->target_index || cpufreq_driver->target; | |
113 | } | |
114 | ||
6eed9404 VK |
115 | /* |
116 | * rwsem to guarantee that cpufreq driver module doesn't unload during critical | |
117 | * sections | |
118 | */ | |
119 | static DECLARE_RWSEM(cpufreq_rwsem); | |
120 | ||
1da177e4 | 121 | /* internal prototypes */ |
29464f28 DJ |
122 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
123 | unsigned int event); | |
d92d50a4 | 124 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
65f27f38 | 125 | static void handle_update(struct work_struct *work); |
1da177e4 LT |
126 | |
127 | /** | |
32ee8c3e DJ |
128 | * Two notifier lists: the "policy" list is involved in the |
129 | * validation process for a new CPU frequency policy; the | |
1da177e4 LT |
130 | * "transition" list for kernel code that needs to handle |
131 | * changes to devices when the CPU clock speed changes. | |
132 | * The mutex locks both lists. | |
133 | */ | |
e041c683 | 134 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
b4dfdbb3 | 135 | static struct srcu_notifier_head cpufreq_transition_notifier_list; |
1da177e4 | 136 | |
74212ca4 | 137 | static bool init_cpufreq_transition_notifier_list_called; |
b4dfdbb3 AS |
138 | static int __init init_cpufreq_transition_notifier_list(void) |
139 | { | |
140 | srcu_init_notifier_head(&cpufreq_transition_notifier_list); | |
74212ca4 | 141 | init_cpufreq_transition_notifier_list_called = true; |
b4dfdbb3 AS |
142 | return 0; |
143 | } | |
b3438f82 | 144 | pure_initcall(init_cpufreq_transition_notifier_list); |
1da177e4 | 145 | |
a7b422cd | 146 | static int off __read_mostly; |
da584455 | 147 | static int cpufreq_disabled(void) |
a7b422cd KRW |
148 | { |
149 | return off; | |
150 | } | |
151 | void disable_cpufreq(void) | |
152 | { | |
153 | off = 1; | |
154 | } | |
29464f28 | 155 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
1da177e4 | 156 | |
4d5dcc42 VK |
157 | bool have_governor_per_policy(void) |
158 | { | |
0b981e70 | 159 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
4d5dcc42 | 160 | } |
3f869d6d | 161 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
4d5dcc42 | 162 | |
944e9a03 VK |
163 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
164 | { | |
165 | if (have_governor_per_policy()) | |
166 | return &policy->kobj; | |
167 | else | |
168 | return cpufreq_global_kobject; | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); | |
171 | ||
72a4ce34 VK |
172 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
173 | { | |
174 | u64 idle_time; | |
175 | u64 cur_wall_time; | |
176 | u64 busy_time; | |
177 | ||
178 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); | |
179 | ||
180 | busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; | |
181 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; | |
182 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; | |
183 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; | |
184 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; | |
185 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; | |
186 | ||
187 | idle_time = cur_wall_time - busy_time; | |
188 | if (wall) | |
189 | *wall = cputime_to_usecs(cur_wall_time); | |
190 | ||
191 | return cputime_to_usecs(idle_time); | |
192 | } | |
193 | ||
194 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) | |
195 | { | |
196 | u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); | |
197 | ||
198 | if (idle_time == -1ULL) | |
199 | return get_cpu_idle_time_jiffy(cpu, wall); | |
200 | else if (!io_busy) | |
201 | idle_time += get_cpu_iowait_time_us(cpu, wall); | |
202 | ||
203 | return idle_time; | |
204 | } | |
205 | EXPORT_SYMBOL_GPL(get_cpu_idle_time); | |
206 | ||
70e9e778 VK |
207 | /* |
208 | * This is a generic cpufreq init() routine which can be used by cpufreq | |
209 | * drivers of SMP systems. It will do following: | |
210 | * - validate & show freq table passed | |
211 | * - set policies transition latency | |
212 | * - policy->cpus with all possible CPUs | |
213 | */ | |
214 | int cpufreq_generic_init(struct cpufreq_policy *policy, | |
215 | struct cpufreq_frequency_table *table, | |
216 | unsigned int transition_latency) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = cpufreq_table_validate_and_show(policy, table); | |
221 | if (ret) { | |
222 | pr_err("%s: invalid frequency table: %d\n", __func__, ret); | |
223 | return ret; | |
224 | } | |
225 | ||
226 | policy->cpuinfo.transition_latency = transition_latency; | |
227 | ||
228 | /* | |
58405af6 | 229 | * The driver only supports the SMP configuration where all processors |
70e9e778 VK |
230 | * share the clock and voltage and clock. |
231 | */ | |
232 | cpumask_setall(policy->cpus); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(cpufreq_generic_init); | |
237 | ||
988bed09 VK |
238 | /* Only for cpufreq core internal use */ |
239 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) | |
652ed95d VK |
240 | { |
241 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); | |
242 | ||
988bed09 VK |
243 | return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; |
244 | } | |
245 | ||
246 | unsigned int cpufreq_generic_get(unsigned int cpu) | |
247 | { | |
248 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); | |
249 | ||
652ed95d | 250 | if (!policy || IS_ERR(policy->clk)) { |
e837f9b5 JP |
251 | pr_err("%s: No %s associated to cpu: %d\n", |
252 | __func__, policy ? "clk" : "policy", cpu); | |
652ed95d VK |
253 | return 0; |
254 | } | |
255 | ||
256 | return clk_get_rate(policy->clk) / 1000; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(cpufreq_generic_get); | |
259 | ||
50e9c852 VK |
260 | /** |
261 | * cpufreq_cpu_get: returns policy for a cpu and marks it busy. | |
262 | * | |
263 | * @cpu: cpu to find policy for. | |
264 | * | |
265 | * This returns policy for 'cpu', returns NULL if it doesn't exist. | |
266 | * It also increments the kobject reference count to mark it busy and so would | |
267 | * require a corresponding call to cpufreq_cpu_put() to decrement it back. | |
268 | * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be | |
269 | * freed as that depends on the kobj count. | |
270 | * | |
271 | * It also takes a read-lock of 'cpufreq_rwsem' and doesn't put it back if a | |
272 | * valid policy is found. This is done to make sure the driver doesn't get | |
273 | * unregistered while the policy is being used. | |
274 | * | |
275 | * Return: A valid policy on success, otherwise NULL on failure. | |
276 | */ | |
6eed9404 | 277 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
1da177e4 | 278 | { |
6eed9404 | 279 | struct cpufreq_policy *policy = NULL; |
1da177e4 LT |
280 | unsigned long flags; |
281 | ||
1b947c90 | 282 | if (WARN_ON(cpu >= nr_cpu_ids)) |
6eed9404 VK |
283 | return NULL; |
284 | ||
285 | if (!down_read_trylock(&cpufreq_rwsem)) | |
286 | return NULL; | |
1da177e4 LT |
287 | |
288 | /* get the cpufreq driver */ | |
1c3d85dd | 289 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
1da177e4 | 290 | |
6eed9404 VK |
291 | if (cpufreq_driver) { |
292 | /* get the CPU */ | |
988bed09 | 293 | policy = cpufreq_cpu_get_raw(cpu); |
6eed9404 VK |
294 | if (policy) |
295 | kobject_get(&policy->kobj); | |
296 | } | |
1da177e4 | 297 | |
6eed9404 | 298 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 299 | |
3a3e9e06 | 300 | if (!policy) |
6eed9404 | 301 | up_read(&cpufreq_rwsem); |
1da177e4 | 302 | |
3a3e9e06 | 303 | return policy; |
a9144436 | 304 | } |
1da177e4 LT |
305 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
306 | ||
50e9c852 VK |
307 | /** |
308 | * cpufreq_cpu_put: Decrements the usage count of a policy | |
309 | * | |
310 | * @policy: policy earlier returned by cpufreq_cpu_get(). | |
311 | * | |
312 | * This decrements the kobject reference count incremented earlier by calling | |
313 | * cpufreq_cpu_get(). | |
314 | * | |
315 | * It also drops the read-lock of 'cpufreq_rwsem' taken at cpufreq_cpu_get(). | |
316 | */ | |
3a3e9e06 | 317 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
1da177e4 | 318 | { |
6eed9404 VK |
319 | kobject_put(&policy->kobj); |
320 | up_read(&cpufreq_rwsem); | |
1da177e4 LT |
321 | } |
322 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); | |
323 | ||
1da177e4 LT |
324 | /********************************************************************* |
325 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * | |
326 | *********************************************************************/ | |
327 | ||
328 | /** | |
329 | * adjust_jiffies - adjust the system "loops_per_jiffy" | |
330 | * | |
331 | * This function alters the system "loops_per_jiffy" for the clock | |
332 | * speed change. Note that loops_per_jiffy cannot be updated on SMP | |
32ee8c3e | 333 | * systems as each CPU might be scaled differently. So, use the arch |
1da177e4 LT |
334 | * per-CPU loops_per_jiffy value wherever possible. |
335 | */ | |
858119e1 | 336 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
1da177e4 | 337 | { |
39c132ee VK |
338 | #ifndef CONFIG_SMP |
339 | static unsigned long l_p_j_ref; | |
340 | static unsigned int l_p_j_ref_freq; | |
341 | ||
1da177e4 LT |
342 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
343 | return; | |
344 | ||
345 | if (!l_p_j_ref_freq) { | |
346 | l_p_j_ref = loops_per_jiffy; | |
347 | l_p_j_ref_freq = ci->old; | |
e837f9b5 JP |
348 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
349 | l_p_j_ref, l_p_j_ref_freq); | |
1da177e4 | 350 | } |
0b443ead | 351 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
e08f5f5b GS |
352 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
353 | ci->new); | |
e837f9b5 JP |
354 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
355 | loops_per_jiffy, ci->new); | |
1da177e4 | 356 | } |
1da177e4 | 357 | #endif |
39c132ee | 358 | } |
1da177e4 | 359 | |
0956df9c | 360 | static void __cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb | 361 | struct cpufreq_freqs *freqs, unsigned int state) |
1da177e4 LT |
362 | { |
363 | BUG_ON(irqs_disabled()); | |
364 | ||
d5aaffa9 DB |
365 | if (cpufreq_disabled()) |
366 | return; | |
367 | ||
1c3d85dd | 368 | freqs->flags = cpufreq_driver->flags; |
2d06d8c4 | 369 | pr_debug("notification %u of frequency transition to %u kHz\n", |
e837f9b5 | 370 | state, freqs->new); |
1da177e4 | 371 | |
1da177e4 | 372 | switch (state) { |
e4472cb3 | 373 | |
1da177e4 | 374 | case CPUFREQ_PRECHANGE: |
32ee8c3e | 375 | /* detect if the driver reported a value as "old frequency" |
e4472cb3 DJ |
376 | * which is not equal to what the cpufreq core thinks is |
377 | * "old frequency". | |
1da177e4 | 378 | */ |
1c3d85dd | 379 | if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e4472cb3 DJ |
380 | if ((policy) && (policy->cpu == freqs->cpu) && |
381 | (policy->cur) && (policy->cur != freqs->old)) { | |
e837f9b5 JP |
382 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
383 | freqs->old, policy->cur); | |
e4472cb3 | 384 | freqs->old = policy->cur; |
1da177e4 LT |
385 | } |
386 | } | |
b4dfdbb3 | 387 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 388 | CPUFREQ_PRECHANGE, freqs); |
1da177e4 LT |
389 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
390 | break; | |
e4472cb3 | 391 | |
1da177e4 LT |
392 | case CPUFREQ_POSTCHANGE: |
393 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); | |
e837f9b5 JP |
394 | pr_debug("FREQ: %lu - CPU: %lu\n", |
395 | (unsigned long)freqs->new, (unsigned long)freqs->cpu); | |
25e41933 | 396 | trace_cpu_frequency(freqs->new, freqs->cpu); |
b4dfdbb3 | 397 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
e041c683 | 398 | CPUFREQ_POSTCHANGE, freqs); |
e4472cb3 DJ |
399 | if (likely(policy) && likely(policy->cpu == freqs->cpu)) |
400 | policy->cur = freqs->new; | |
1da177e4 LT |
401 | break; |
402 | } | |
1da177e4 | 403 | } |
bb176f7d | 404 | |
b43a7ffb VK |
405 | /** |
406 | * cpufreq_notify_transition - call notifier chain and adjust_jiffies | |
407 | * on frequency transition. | |
408 | * | |
409 | * This function calls the transition notifiers and the "adjust_jiffies" | |
410 | * function. It is called twice on all CPU frequency changes that have | |
411 | * external effects. | |
412 | */ | |
236a9800 | 413 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
b43a7ffb VK |
414 | struct cpufreq_freqs *freqs, unsigned int state) |
415 | { | |
416 | for_each_cpu(freqs->cpu, policy->cpus) | |
417 | __cpufreq_notify_transition(policy, freqs, state); | |
418 | } | |
1da177e4 | 419 | |
f7ba3b41 | 420 | /* Do post notifications when there are chances that transition has failed */ |
236a9800 | 421 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
f7ba3b41 VK |
422 | struct cpufreq_freqs *freqs, int transition_failed) |
423 | { | |
424 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
425 | if (!transition_failed) | |
426 | return; | |
427 | ||
428 | swap(freqs->old, freqs->new); | |
429 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
430 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
431 | } | |
f7ba3b41 | 432 | |
12478cf0 SB |
433 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
434 | struct cpufreq_freqs *freqs) | |
435 | { | |
ca654dc3 SB |
436 | |
437 | /* | |
438 | * Catch double invocations of _begin() which lead to self-deadlock. | |
439 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core | |
440 | * doesn't invoke _begin() on their behalf, and hence the chances of | |
441 | * double invocations are very low. Moreover, there are scenarios | |
442 | * where these checks can emit false-positive warnings in these | |
443 | * drivers; so we avoid that by skipping them altogether. | |
444 | */ | |
445 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) | |
446 | && current == policy->transition_task); | |
447 | ||
12478cf0 SB |
448 | wait: |
449 | wait_event(policy->transition_wait, !policy->transition_ongoing); | |
450 | ||
451 | spin_lock(&policy->transition_lock); | |
452 | ||
453 | if (unlikely(policy->transition_ongoing)) { | |
454 | spin_unlock(&policy->transition_lock); | |
455 | goto wait; | |
456 | } | |
457 | ||
458 | policy->transition_ongoing = true; | |
ca654dc3 | 459 | policy->transition_task = current; |
12478cf0 SB |
460 | |
461 | spin_unlock(&policy->transition_lock); | |
462 | ||
463 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); | |
466 | ||
467 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
468 | struct cpufreq_freqs *freqs, int transition_failed) | |
469 | { | |
470 | if (unlikely(WARN_ON(!policy->transition_ongoing))) | |
471 | return; | |
472 | ||
473 | cpufreq_notify_post_transition(policy, freqs, transition_failed); | |
474 | ||
475 | policy->transition_ongoing = false; | |
ca654dc3 | 476 | policy->transition_task = NULL; |
12478cf0 SB |
477 | |
478 | wake_up(&policy->transition_wait); | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); | |
481 | ||
1da177e4 | 482 | |
1da177e4 LT |
483 | /********************************************************************* |
484 | * SYSFS INTERFACE * | |
485 | *********************************************************************/ | |
8a5c74a1 | 486 | static ssize_t show_boost(struct kobject *kobj, |
6f19efc0 LM |
487 | struct attribute *attr, char *buf) |
488 | { | |
489 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); | |
490 | } | |
491 | ||
492 | static ssize_t store_boost(struct kobject *kobj, struct attribute *attr, | |
493 | const char *buf, size_t count) | |
494 | { | |
495 | int ret, enable; | |
496 | ||
497 | ret = sscanf(buf, "%d", &enable); | |
498 | if (ret != 1 || enable < 0 || enable > 1) | |
499 | return -EINVAL; | |
500 | ||
501 | if (cpufreq_boost_trigger_state(enable)) { | |
e837f9b5 JP |
502 | pr_err("%s: Cannot %s BOOST!\n", |
503 | __func__, enable ? "enable" : "disable"); | |
6f19efc0 LM |
504 | return -EINVAL; |
505 | } | |
506 | ||
e837f9b5 JP |
507 | pr_debug("%s: cpufreq BOOST %s\n", |
508 | __func__, enable ? "enabled" : "disabled"); | |
6f19efc0 LM |
509 | |
510 | return count; | |
511 | } | |
512 | define_one_global_rw(boost); | |
1da177e4 | 513 | |
42f91fa1 | 514 | static struct cpufreq_governor *find_governor(const char *str_governor) |
3bcb09a3 JF |
515 | { |
516 | struct cpufreq_governor *t; | |
517 | ||
f7b27061 | 518 | for_each_governor(t) |
7c4f4539 | 519 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
3bcb09a3 JF |
520 | return t; |
521 | ||
522 | return NULL; | |
523 | } | |
524 | ||
1da177e4 LT |
525 | /** |
526 | * cpufreq_parse_governor - parse a governor string | |
527 | */ | |
905d77cd | 528 | static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, |
1da177e4 LT |
529 | struct cpufreq_governor **governor) |
530 | { | |
3bcb09a3 | 531 | int err = -EINVAL; |
1c3d85dd RW |
532 | |
533 | if (!cpufreq_driver) | |
3bcb09a3 JF |
534 | goto out; |
535 | ||
1c3d85dd | 536 | if (cpufreq_driver->setpolicy) { |
7c4f4539 | 537 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { |
1da177e4 | 538 | *policy = CPUFREQ_POLICY_PERFORMANCE; |
3bcb09a3 | 539 | err = 0; |
7c4f4539 | 540 | } else if (!strncasecmp(str_governor, "powersave", |
e08f5f5b | 541 | CPUFREQ_NAME_LEN)) { |
1da177e4 | 542 | *policy = CPUFREQ_POLICY_POWERSAVE; |
3bcb09a3 | 543 | err = 0; |
1da177e4 | 544 | } |
2e1cc3a5 | 545 | } else { |
1da177e4 | 546 | struct cpufreq_governor *t; |
3bcb09a3 | 547 | |
3fc54d37 | 548 | mutex_lock(&cpufreq_governor_mutex); |
3bcb09a3 | 549 | |
42f91fa1 | 550 | t = find_governor(str_governor); |
3bcb09a3 | 551 | |
ea714970 | 552 | if (t == NULL) { |
1a8e1463 | 553 | int ret; |
ea714970 | 554 | |
1a8e1463 KC |
555 | mutex_unlock(&cpufreq_governor_mutex); |
556 | ret = request_module("cpufreq_%s", str_governor); | |
557 | mutex_lock(&cpufreq_governor_mutex); | |
ea714970 | 558 | |
1a8e1463 | 559 | if (ret == 0) |
42f91fa1 | 560 | t = find_governor(str_governor); |
ea714970 JF |
561 | } |
562 | ||
3bcb09a3 JF |
563 | if (t != NULL) { |
564 | *governor = t; | |
565 | err = 0; | |
1da177e4 | 566 | } |
3bcb09a3 | 567 | |
3fc54d37 | 568 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 | 569 | } |
29464f28 | 570 | out: |
3bcb09a3 | 571 | return err; |
1da177e4 | 572 | } |
1da177e4 | 573 | |
1da177e4 | 574 | /** |
e08f5f5b GS |
575 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
576 | * print out cpufreq information | |
1da177e4 LT |
577 | * |
578 | * Write out information from cpufreq_driver->policy[cpu]; object must be | |
579 | * "unsigned int". | |
580 | */ | |
581 | ||
32ee8c3e DJ |
582 | #define show_one(file_name, object) \ |
583 | static ssize_t show_##file_name \ | |
905d77cd | 584 | (struct cpufreq_policy *policy, char *buf) \ |
32ee8c3e | 585 | { \ |
29464f28 | 586 | return sprintf(buf, "%u\n", policy->object); \ |
1da177e4 LT |
587 | } |
588 | ||
589 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); | |
590 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); | |
ed129784 | 591 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
1da177e4 LT |
592 | show_one(scaling_min_freq, min); |
593 | show_one(scaling_max_freq, max); | |
c034b02e | 594 | |
09347b29 | 595 | static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
c034b02e DB |
596 | { |
597 | ssize_t ret; | |
598 | ||
599 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) | |
600 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); | |
601 | else | |
602 | ret = sprintf(buf, "%u\n", policy->cur); | |
603 | return ret; | |
604 | } | |
1da177e4 | 605 | |
037ce839 | 606 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 607 | struct cpufreq_policy *new_policy); |
7970e08b | 608 | |
1da177e4 LT |
609 | /** |
610 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access | |
611 | */ | |
612 | #define store_one(file_name, object) \ | |
613 | static ssize_t store_##file_name \ | |
905d77cd | 614 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
1da177e4 | 615 | { \ |
619c144c | 616 | int ret, temp; \ |
1da177e4 LT |
617 | struct cpufreq_policy new_policy; \ |
618 | \ | |
619 | ret = cpufreq_get_policy(&new_policy, policy->cpu); \ | |
620 | if (ret) \ | |
621 | return -EINVAL; \ | |
622 | \ | |
29464f28 | 623 | ret = sscanf(buf, "%u", &new_policy.object); \ |
1da177e4 LT |
624 | if (ret != 1) \ |
625 | return -EINVAL; \ | |
626 | \ | |
619c144c | 627 | temp = new_policy.object; \ |
037ce839 | 628 | ret = cpufreq_set_policy(policy, &new_policy); \ |
619c144c VH |
629 | if (!ret) \ |
630 | policy->user_policy.object = temp; \ | |
1da177e4 LT |
631 | \ |
632 | return ret ? ret : count; \ | |
633 | } | |
634 | ||
29464f28 DJ |
635 | store_one(scaling_min_freq, min); |
636 | store_one(scaling_max_freq, max); | |
1da177e4 LT |
637 | |
638 | /** | |
639 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware | |
640 | */ | |
905d77cd DJ |
641 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
642 | char *buf) | |
1da177e4 | 643 | { |
d92d50a4 | 644 | unsigned int cur_freq = __cpufreq_get(policy); |
1da177e4 LT |
645 | if (!cur_freq) |
646 | return sprintf(buf, "<unknown>"); | |
647 | return sprintf(buf, "%u\n", cur_freq); | |
648 | } | |
649 | ||
1da177e4 LT |
650 | /** |
651 | * show_scaling_governor - show the current policy for the specified CPU | |
652 | */ | |
905d77cd | 653 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 654 | { |
29464f28 | 655 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
1da177e4 LT |
656 | return sprintf(buf, "powersave\n"); |
657 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) | |
658 | return sprintf(buf, "performance\n"); | |
659 | else if (policy->governor) | |
4b972f0b | 660 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
29464f28 | 661 | policy->governor->name); |
1da177e4 LT |
662 | return -EINVAL; |
663 | } | |
664 | ||
1da177e4 LT |
665 | /** |
666 | * store_scaling_governor - store policy for the specified CPU | |
667 | */ | |
905d77cd DJ |
668 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
669 | const char *buf, size_t count) | |
1da177e4 | 670 | { |
5136fa56 | 671 | int ret; |
1da177e4 LT |
672 | char str_governor[16]; |
673 | struct cpufreq_policy new_policy; | |
674 | ||
675 | ret = cpufreq_get_policy(&new_policy, policy->cpu); | |
676 | if (ret) | |
677 | return ret; | |
678 | ||
29464f28 | 679 | ret = sscanf(buf, "%15s", str_governor); |
1da177e4 LT |
680 | if (ret != 1) |
681 | return -EINVAL; | |
682 | ||
e08f5f5b GS |
683 | if (cpufreq_parse_governor(str_governor, &new_policy.policy, |
684 | &new_policy.governor)) | |
1da177e4 LT |
685 | return -EINVAL; |
686 | ||
037ce839 | 687 | ret = cpufreq_set_policy(policy, &new_policy); |
7970e08b TR |
688 | |
689 | policy->user_policy.policy = policy->policy; | |
690 | policy->user_policy.governor = policy->governor; | |
7970e08b | 691 | |
e08f5f5b GS |
692 | if (ret) |
693 | return ret; | |
694 | else | |
695 | return count; | |
1da177e4 LT |
696 | } |
697 | ||
698 | /** | |
699 | * show_scaling_driver - show the cpufreq driver currently loaded | |
700 | */ | |
905d77cd | 701 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 702 | { |
1c3d85dd | 703 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
1da177e4 LT |
704 | } |
705 | ||
706 | /** | |
707 | * show_scaling_available_governors - show the available CPUfreq governors | |
708 | */ | |
905d77cd DJ |
709 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
710 | char *buf) | |
1da177e4 LT |
711 | { |
712 | ssize_t i = 0; | |
713 | struct cpufreq_governor *t; | |
714 | ||
9c0ebcf7 | 715 | if (!has_target()) { |
1da177e4 LT |
716 | i += sprintf(buf, "performance powersave"); |
717 | goto out; | |
718 | } | |
719 | ||
f7b27061 | 720 | for_each_governor(t) { |
29464f28 DJ |
721 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
722 | - (CPUFREQ_NAME_LEN + 2))) | |
1da177e4 | 723 | goto out; |
4b972f0b | 724 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
1da177e4 | 725 | } |
7d5e350f | 726 | out: |
1da177e4 LT |
727 | i += sprintf(&buf[i], "\n"); |
728 | return i; | |
729 | } | |
e8628dd0 | 730 | |
f4fd3797 | 731 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
1da177e4 LT |
732 | { |
733 | ssize_t i = 0; | |
734 | unsigned int cpu; | |
735 | ||
835481d9 | 736 | for_each_cpu(cpu, mask) { |
1da177e4 LT |
737 | if (i) |
738 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); | |
739 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); | |
740 | if (i >= (PAGE_SIZE - 5)) | |
29464f28 | 741 | break; |
1da177e4 LT |
742 | } |
743 | i += sprintf(&buf[i], "\n"); | |
744 | return i; | |
745 | } | |
f4fd3797 | 746 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
1da177e4 | 747 | |
e8628dd0 DW |
748 | /** |
749 | * show_related_cpus - show the CPUs affected by each transition even if | |
750 | * hw coordination is in use | |
751 | */ | |
752 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) | |
753 | { | |
f4fd3797 | 754 | return cpufreq_show_cpus(policy->related_cpus, buf); |
e8628dd0 DW |
755 | } |
756 | ||
757 | /** | |
758 | * show_affected_cpus - show the CPUs affected by each transition | |
759 | */ | |
760 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) | |
761 | { | |
f4fd3797 | 762 | return cpufreq_show_cpus(policy->cpus, buf); |
e8628dd0 DW |
763 | } |
764 | ||
9e76988e | 765 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
905d77cd | 766 | const char *buf, size_t count) |
9e76988e VP |
767 | { |
768 | unsigned int freq = 0; | |
769 | unsigned int ret; | |
770 | ||
879000f9 | 771 | if (!policy->governor || !policy->governor->store_setspeed) |
9e76988e VP |
772 | return -EINVAL; |
773 | ||
774 | ret = sscanf(buf, "%u", &freq); | |
775 | if (ret != 1) | |
776 | return -EINVAL; | |
777 | ||
778 | policy->governor->store_setspeed(policy, freq); | |
779 | ||
780 | return count; | |
781 | } | |
782 | ||
783 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) | |
784 | { | |
879000f9 | 785 | if (!policy->governor || !policy->governor->show_setspeed) |
9e76988e VP |
786 | return sprintf(buf, "<unsupported>\n"); |
787 | ||
788 | return policy->governor->show_setspeed(policy, buf); | |
789 | } | |
1da177e4 | 790 | |
e2f74f35 | 791 | /** |
8bf1ac72 | 792 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
e2f74f35 TR |
793 | */ |
794 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) | |
795 | { | |
796 | unsigned int limit; | |
797 | int ret; | |
1c3d85dd RW |
798 | if (cpufreq_driver->bios_limit) { |
799 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); | |
e2f74f35 TR |
800 | if (!ret) |
801 | return sprintf(buf, "%u\n", limit); | |
802 | } | |
803 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); | |
804 | } | |
805 | ||
6dad2a29 BP |
806 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
807 | cpufreq_freq_attr_ro(cpuinfo_min_freq); | |
808 | cpufreq_freq_attr_ro(cpuinfo_max_freq); | |
809 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); | |
810 | cpufreq_freq_attr_ro(scaling_available_governors); | |
811 | cpufreq_freq_attr_ro(scaling_driver); | |
812 | cpufreq_freq_attr_ro(scaling_cur_freq); | |
813 | cpufreq_freq_attr_ro(bios_limit); | |
814 | cpufreq_freq_attr_ro(related_cpus); | |
815 | cpufreq_freq_attr_ro(affected_cpus); | |
816 | cpufreq_freq_attr_rw(scaling_min_freq); | |
817 | cpufreq_freq_attr_rw(scaling_max_freq); | |
818 | cpufreq_freq_attr_rw(scaling_governor); | |
819 | cpufreq_freq_attr_rw(scaling_setspeed); | |
1da177e4 | 820 | |
905d77cd | 821 | static struct attribute *default_attrs[] = { |
1da177e4 LT |
822 | &cpuinfo_min_freq.attr, |
823 | &cpuinfo_max_freq.attr, | |
ed129784 | 824 | &cpuinfo_transition_latency.attr, |
1da177e4 LT |
825 | &scaling_min_freq.attr, |
826 | &scaling_max_freq.attr, | |
827 | &affected_cpus.attr, | |
e8628dd0 | 828 | &related_cpus.attr, |
1da177e4 LT |
829 | &scaling_governor.attr, |
830 | &scaling_driver.attr, | |
831 | &scaling_available_governors.attr, | |
9e76988e | 832 | &scaling_setspeed.attr, |
1da177e4 LT |
833 | NULL |
834 | }; | |
835 | ||
29464f28 DJ |
836 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
837 | #define to_attr(a) container_of(a, struct freq_attr, attr) | |
1da177e4 | 838 | |
29464f28 | 839 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
1da177e4 | 840 | { |
905d77cd DJ |
841 | struct cpufreq_policy *policy = to_policy(kobj); |
842 | struct freq_attr *fattr = to_attr(attr); | |
1b750e3b | 843 | ssize_t ret; |
6eed9404 VK |
844 | |
845 | if (!down_read_trylock(&cpufreq_rwsem)) | |
1b750e3b | 846 | return -EINVAL; |
5a01f2e8 | 847 | |
ad7722da | 848 | down_read(&policy->rwsem); |
5a01f2e8 | 849 | |
e08f5f5b GS |
850 | if (fattr->show) |
851 | ret = fattr->show(policy, buf); | |
852 | else | |
853 | ret = -EIO; | |
854 | ||
ad7722da | 855 | up_read(&policy->rwsem); |
6eed9404 | 856 | up_read(&cpufreq_rwsem); |
1b750e3b | 857 | |
1da177e4 LT |
858 | return ret; |
859 | } | |
860 | ||
905d77cd DJ |
861 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
862 | const char *buf, size_t count) | |
1da177e4 | 863 | { |
905d77cd DJ |
864 | struct cpufreq_policy *policy = to_policy(kobj); |
865 | struct freq_attr *fattr = to_attr(attr); | |
a07530b4 | 866 | ssize_t ret = -EINVAL; |
6eed9404 | 867 | |
4f750c93 SB |
868 | get_online_cpus(); |
869 | ||
870 | if (!cpu_online(policy->cpu)) | |
871 | goto unlock; | |
872 | ||
6eed9404 | 873 | if (!down_read_trylock(&cpufreq_rwsem)) |
4f750c93 | 874 | goto unlock; |
5a01f2e8 | 875 | |
ad7722da | 876 | down_write(&policy->rwsem); |
5a01f2e8 | 877 | |
11e584cf VK |
878 | /* Updating inactive policies is invalid, so avoid doing that. */ |
879 | if (unlikely(policy_is_inactive(policy))) { | |
880 | ret = -EBUSY; | |
881 | goto unlock_policy_rwsem; | |
882 | } | |
883 | ||
e08f5f5b GS |
884 | if (fattr->store) |
885 | ret = fattr->store(policy, buf, count); | |
886 | else | |
887 | ret = -EIO; | |
888 | ||
11e584cf | 889 | unlock_policy_rwsem: |
ad7722da | 890 | up_write(&policy->rwsem); |
6eed9404 | 891 | |
6eed9404 | 892 | up_read(&cpufreq_rwsem); |
4f750c93 SB |
893 | unlock: |
894 | put_online_cpus(); | |
895 | ||
1da177e4 LT |
896 | return ret; |
897 | } | |
898 | ||
905d77cd | 899 | static void cpufreq_sysfs_release(struct kobject *kobj) |
1da177e4 | 900 | { |
905d77cd | 901 | struct cpufreq_policy *policy = to_policy(kobj); |
2d06d8c4 | 902 | pr_debug("last reference is dropped\n"); |
1da177e4 LT |
903 | complete(&policy->kobj_unregister); |
904 | } | |
905 | ||
52cf25d0 | 906 | static const struct sysfs_ops sysfs_ops = { |
1da177e4 LT |
907 | .show = show, |
908 | .store = store, | |
909 | }; | |
910 | ||
911 | static struct kobj_type ktype_cpufreq = { | |
912 | .sysfs_ops = &sysfs_ops, | |
913 | .default_attrs = default_attrs, | |
914 | .release = cpufreq_sysfs_release, | |
915 | }; | |
916 | ||
2361be23 VK |
917 | struct kobject *cpufreq_global_kobject; |
918 | EXPORT_SYMBOL(cpufreq_global_kobject); | |
919 | ||
920 | static int cpufreq_global_kobject_usage; | |
921 | ||
922 | int cpufreq_get_global_kobject(void) | |
923 | { | |
924 | if (!cpufreq_global_kobject_usage++) | |
925 | return kobject_add(cpufreq_global_kobject, | |
926 | &cpu_subsys.dev_root->kobj, "%s", "cpufreq"); | |
927 | ||
928 | return 0; | |
929 | } | |
930 | EXPORT_SYMBOL(cpufreq_get_global_kobject); | |
931 | ||
932 | void cpufreq_put_global_kobject(void) | |
933 | { | |
934 | if (!--cpufreq_global_kobject_usage) | |
935 | kobject_del(cpufreq_global_kobject); | |
936 | } | |
937 | EXPORT_SYMBOL(cpufreq_put_global_kobject); | |
938 | ||
939 | int cpufreq_sysfs_create_file(const struct attribute *attr) | |
940 | { | |
941 | int ret = cpufreq_get_global_kobject(); | |
942 | ||
943 | if (!ret) { | |
944 | ret = sysfs_create_file(cpufreq_global_kobject, attr); | |
945 | if (ret) | |
946 | cpufreq_put_global_kobject(); | |
947 | } | |
948 | ||
949 | return ret; | |
950 | } | |
951 | EXPORT_SYMBOL(cpufreq_sysfs_create_file); | |
952 | ||
953 | void cpufreq_sysfs_remove_file(const struct attribute *attr) | |
954 | { | |
955 | sysfs_remove_file(cpufreq_global_kobject, attr); | |
956 | cpufreq_put_global_kobject(); | |
957 | } | |
958 | EXPORT_SYMBOL(cpufreq_sysfs_remove_file); | |
959 | ||
19d6f7ec | 960 | /* symlink affected CPUs */ |
308b60e7 | 961 | static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy) |
19d6f7ec DJ |
962 | { |
963 | unsigned int j; | |
964 | int ret = 0; | |
965 | ||
966 | for_each_cpu(j, policy->cpus) { | |
8a25a2fd | 967 | struct device *cpu_dev; |
19d6f7ec | 968 | |
9d16f207 | 969 | if (j == policy->kobj_cpu) |
19d6f7ec | 970 | continue; |
19d6f7ec | 971 | |
e8fdde10 | 972 | pr_debug("Adding link for CPU: %u\n", j); |
8a25a2fd KS |
973 | cpu_dev = get_cpu_device(j); |
974 | ret = sysfs_create_link(&cpu_dev->kobj, &policy->kobj, | |
19d6f7ec | 975 | "cpufreq"); |
71c3461e RW |
976 | if (ret) |
977 | break; | |
19d6f7ec DJ |
978 | } |
979 | return ret; | |
980 | } | |
981 | ||
308b60e7 | 982 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, |
8a25a2fd | 983 | struct device *dev) |
909a694e DJ |
984 | { |
985 | struct freq_attr **drv_attr; | |
909a694e | 986 | int ret = 0; |
909a694e | 987 | |
909a694e | 988 | /* set up files for this cpu device */ |
1c3d85dd | 989 | drv_attr = cpufreq_driver->attr; |
f13f1184 | 990 | while (drv_attr && *drv_attr) { |
909a694e DJ |
991 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
992 | if (ret) | |
6d4e81ed | 993 | return ret; |
909a694e DJ |
994 | drv_attr++; |
995 | } | |
1c3d85dd | 996 | if (cpufreq_driver->get) { |
909a694e DJ |
997 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
998 | if (ret) | |
6d4e81ed | 999 | return ret; |
909a694e | 1000 | } |
c034b02e DB |
1001 | |
1002 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); | |
1003 | if (ret) | |
6d4e81ed | 1004 | return ret; |
c034b02e | 1005 | |
1c3d85dd | 1006 | if (cpufreq_driver->bios_limit) { |
e2f74f35 TR |
1007 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
1008 | if (ret) | |
6d4e81ed | 1009 | return ret; |
e2f74f35 | 1010 | } |
909a694e | 1011 | |
6d4e81ed | 1012 | return cpufreq_add_dev_symlink(policy); |
e18f1682 SB |
1013 | } |
1014 | ||
1015 | static void cpufreq_init_policy(struct cpufreq_policy *policy) | |
1016 | { | |
6e2c89d1 | 1017 | struct cpufreq_governor *gov = NULL; |
e18f1682 SB |
1018 | struct cpufreq_policy new_policy; |
1019 | int ret = 0; | |
1020 | ||
d5b73cd8 | 1021 | memcpy(&new_policy, policy, sizeof(*policy)); |
a27a9ab7 | 1022 | |
6e2c89d1 | 1023 | /* Update governor of new_policy to the governor used before hotplug */ |
4573237b | 1024 | gov = find_governor(policy->last_governor); |
6e2c89d1 | 1025 | if (gov) |
1026 | pr_debug("Restoring governor %s for cpu %d\n", | |
1027 | policy->governor->name, policy->cpu); | |
1028 | else | |
1029 | gov = CPUFREQ_DEFAULT_GOVERNOR; | |
1030 | ||
1031 | new_policy.governor = gov; | |
1032 | ||
a27a9ab7 JB |
1033 | /* Use the default policy if its valid. */ |
1034 | if (cpufreq_driver->setpolicy) | |
6e2c89d1 | 1035 | cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); |
ecf7e461 DJ |
1036 | |
1037 | /* set default policy */ | |
037ce839 | 1038 | ret = cpufreq_set_policy(policy, &new_policy); |
ecf7e461 | 1039 | if (ret) { |
2d06d8c4 | 1040 | pr_debug("setting policy failed\n"); |
1c3d85dd RW |
1041 | if (cpufreq_driver->exit) |
1042 | cpufreq_driver->exit(policy); | |
ecf7e461 | 1043 | } |
909a694e DJ |
1044 | } |
1045 | ||
d8d3b471 | 1046 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, |
42f921a6 | 1047 | unsigned int cpu, struct device *dev) |
fcf80582 | 1048 | { |
9c0ebcf7 | 1049 | int ret = 0; |
fcf80582 | 1050 | |
bb29ae15 VK |
1051 | /* Has this CPU been taken care of already? */ |
1052 | if (cpumask_test_cpu(cpu, policy->cpus)) | |
1053 | return 0; | |
1054 | ||
9c0ebcf7 | 1055 | if (has_target()) { |
3de9bdeb VK |
1056 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
1057 | if (ret) { | |
1058 | pr_err("%s: Failed to stop governor\n", __func__); | |
1059 | return ret; | |
1060 | } | |
1061 | } | |
fcf80582 | 1062 | |
ad7722da | 1063 | down_write(&policy->rwsem); |
fcf80582 | 1064 | cpumask_set_cpu(cpu, policy->cpus); |
ad7722da | 1065 | up_write(&policy->rwsem); |
2eaa3e2d | 1066 | |
9c0ebcf7 | 1067 | if (has_target()) { |
e5c87b76 SK |
1068 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); |
1069 | if (!ret) | |
1070 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1071 | ||
1072 | if (ret) { | |
3de9bdeb VK |
1073 | pr_err("%s: Failed to start governor\n", __func__); |
1074 | return ret; | |
1075 | } | |
820c6ca2 | 1076 | } |
fcf80582 | 1077 | |
42f921a6 | 1078 | return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"); |
fcf80582 | 1079 | } |
1da177e4 | 1080 | |
8414809c SB |
1081 | static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) |
1082 | { | |
1083 | struct cpufreq_policy *policy; | |
1084 | unsigned long flags; | |
1085 | ||
44871c9c | 1086 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
3914d379 | 1087 | policy = per_cpu(cpufreq_cpu_data, cpu); |
44871c9c | 1088 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
8414809c | 1089 | |
3914d379 VK |
1090 | if (likely(policy)) { |
1091 | /* Policy should be inactive here */ | |
1092 | WARN_ON(!policy_is_inactive(policy)); | |
3914d379 | 1093 | } |
6e2c89d1 | 1094 | |
8414809c SB |
1095 | return policy; |
1096 | } | |
1097 | ||
e9698cc5 SB |
1098 | static struct cpufreq_policy *cpufreq_policy_alloc(void) |
1099 | { | |
1100 | struct cpufreq_policy *policy; | |
1101 | ||
1102 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); | |
1103 | if (!policy) | |
1104 | return NULL; | |
1105 | ||
1106 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) | |
1107 | goto err_free_policy; | |
1108 | ||
1109 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) | |
1110 | goto err_free_cpumask; | |
1111 | ||
c88a1f8b | 1112 | INIT_LIST_HEAD(&policy->policy_list); |
ad7722da | 1113 | init_rwsem(&policy->rwsem); |
12478cf0 SB |
1114 | spin_lock_init(&policy->transition_lock); |
1115 | init_waitqueue_head(&policy->transition_wait); | |
818c5712 VK |
1116 | init_completion(&policy->kobj_unregister); |
1117 | INIT_WORK(&policy->update, handle_update); | |
ad7722da | 1118 | |
e9698cc5 SB |
1119 | return policy; |
1120 | ||
1121 | err_free_cpumask: | |
1122 | free_cpumask_var(policy->cpus); | |
1123 | err_free_policy: | |
1124 | kfree(policy); | |
1125 | ||
1126 | return NULL; | |
1127 | } | |
1128 | ||
42f921a6 VK |
1129 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) |
1130 | { | |
1131 | struct kobject *kobj; | |
1132 | struct completion *cmp; | |
1133 | ||
fcd7af91 VK |
1134 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1135 | CPUFREQ_REMOVE_POLICY, policy); | |
1136 | ||
42f921a6 VK |
1137 | down_read(&policy->rwsem); |
1138 | kobj = &policy->kobj; | |
1139 | cmp = &policy->kobj_unregister; | |
1140 | up_read(&policy->rwsem); | |
1141 | kobject_put(kobj); | |
1142 | ||
1143 | /* | |
1144 | * We need to make sure that the underlying kobj is | |
1145 | * actually not referenced anymore by anybody before we | |
1146 | * proceed with unloading. | |
1147 | */ | |
1148 | pr_debug("waiting for dropping of refcount\n"); | |
1149 | wait_for_completion(cmp); | |
1150 | pr_debug("wait complete\n"); | |
1151 | } | |
1152 | ||
e9698cc5 SB |
1153 | static void cpufreq_policy_free(struct cpufreq_policy *policy) |
1154 | { | |
988bed09 VK |
1155 | unsigned long flags; |
1156 | int cpu; | |
1157 | ||
1158 | /* Remove policy from list */ | |
1159 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
1160 | list_del(&policy->policy_list); | |
1161 | ||
1162 | for_each_cpu(cpu, policy->related_cpus) | |
1163 | per_cpu(cpufreq_cpu_data, cpu) = NULL; | |
1164 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1165 | ||
e9698cc5 SB |
1166 | free_cpumask_var(policy->related_cpus); |
1167 | free_cpumask_var(policy->cpus); | |
1168 | kfree(policy); | |
1169 | } | |
1170 | ||
1bfb425b VK |
1171 | static int update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu, |
1172 | struct device *cpu_dev) | |
0d66b91e | 1173 | { |
1bfb425b VK |
1174 | int ret; |
1175 | ||
99ec899e | 1176 | if (WARN_ON(cpu == policy->cpu)) |
1bfb425b VK |
1177 | return 0; |
1178 | ||
1179 | /* Move kobject to the new policy->cpu */ | |
1180 | ret = kobject_move(&policy->kobj, &cpu_dev->kobj); | |
1181 | if (ret) { | |
1182 | pr_err("%s: Failed to move kobj: %d\n", __func__, ret); | |
1183 | return ret; | |
1184 | } | |
cb38ed5c | 1185 | |
ad7722da | 1186 | down_write(&policy->rwsem); |
0d66b91e | 1187 | policy->cpu = cpu; |
9d16f207 | 1188 | policy->kobj_cpu = cpu; |
ad7722da | 1189 | up_write(&policy->rwsem); |
8efd5765 | 1190 | |
1bfb425b | 1191 | return 0; |
0d66b91e SB |
1192 | } |
1193 | ||
23faf0b7 VK |
1194 | /** |
1195 | * cpufreq_add_dev - add a CPU device | |
1196 | * | |
1197 | * Adds the cpufreq interface for a CPU device. | |
1198 | * | |
1199 | * The Oracle says: try running cpufreq registration/unregistration concurrently | |
1200 | * with with cpu hotplugging and all hell will break loose. Tried to clean this | |
1201 | * mess up, but more thorough testing is needed. - Mathieu | |
1202 | */ | |
1203 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) | |
1da177e4 | 1204 | { |
fcf80582 | 1205 | unsigned int j, cpu = dev->id; |
65922465 | 1206 | int ret = -ENOMEM; |
7f0c020a | 1207 | struct cpufreq_policy *policy; |
1da177e4 | 1208 | unsigned long flags; |
96bbbe4a | 1209 | bool recover_policy = cpufreq_suspended; |
1da177e4 | 1210 | |
c32b6b8e AR |
1211 | if (cpu_is_offline(cpu)) |
1212 | return 0; | |
1213 | ||
2d06d8c4 | 1214 | pr_debug("adding CPU %u\n", cpu); |
1da177e4 | 1215 | |
6eed9404 VK |
1216 | if (!down_read_trylock(&cpufreq_rwsem)) |
1217 | return 0; | |
1218 | ||
bb29ae15 | 1219 | /* Check if this CPU already has a policy to manage it */ |
9104bb26 VK |
1220 | policy = per_cpu(cpufreq_cpu_data, cpu); |
1221 | if (policy && !policy_is_inactive(policy)) { | |
1222 | WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); | |
1223 | ret = cpufreq_add_policy_cpu(policy, cpu, dev); | |
1224 | up_read(&cpufreq_rwsem); | |
1225 | return ret; | |
fcf80582 | 1226 | } |
1da177e4 | 1227 | |
72368d12 RW |
1228 | /* |
1229 | * Restore the saved policy when doing light-weight init and fall back | |
1230 | * to the full init if that fails. | |
1231 | */ | |
96bbbe4a | 1232 | policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL; |
72368d12 | 1233 | if (!policy) { |
96bbbe4a | 1234 | recover_policy = false; |
8414809c | 1235 | policy = cpufreq_policy_alloc(); |
72368d12 RW |
1236 | if (!policy) |
1237 | goto nomem_out; | |
1238 | } | |
0d66b91e SB |
1239 | |
1240 | /* | |
1241 | * In the resume path, since we restore a saved policy, the assignment | |
1242 | * to policy->cpu is like an update of the existing policy, rather than | |
1243 | * the creation of a brand new one. So we need to perform this update | |
1244 | * by invoking update_policy_cpu(). | |
1245 | */ | |
9d16f207 | 1246 | if (recover_policy && cpu != policy->cpu) { |
1bfb425b | 1247 | WARN_ON(update_policy_cpu(policy, cpu, dev)); |
9d16f207 | 1248 | } else { |
0d66b91e | 1249 | policy->cpu = cpu; |
9d16f207 SK |
1250 | policy->kobj_cpu = cpu; |
1251 | } | |
0d66b91e | 1252 | |
835481d9 | 1253 | cpumask_copy(policy->cpus, cpumask_of(cpu)); |
1da177e4 | 1254 | |
1da177e4 LT |
1255 | /* call driver. From then on the cpufreq must be able |
1256 | * to accept all calls to ->verify and ->setpolicy for this CPU | |
1257 | */ | |
1c3d85dd | 1258 | ret = cpufreq_driver->init(policy); |
1da177e4 | 1259 | if (ret) { |
2d06d8c4 | 1260 | pr_debug("initialization failed\n"); |
2eaa3e2d | 1261 | goto err_set_policy_cpu; |
1da177e4 | 1262 | } |
643ae6e8 | 1263 | |
6d4e81ed TV |
1264 | down_write(&policy->rwsem); |
1265 | ||
5a7e56a5 VK |
1266 | /* related cpus should atleast have policy->cpus */ |
1267 | cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); | |
1268 | ||
1269 | /* | |
1270 | * affected cpus must always be the one, which are online. We aren't | |
1271 | * managing offline cpus here. | |
1272 | */ | |
1273 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); | |
1274 | ||
96bbbe4a | 1275 | if (!recover_policy) { |
5a7e56a5 VK |
1276 | policy->user_policy.min = policy->min; |
1277 | policy->user_policy.max = policy->max; | |
6d4e81ed TV |
1278 | |
1279 | /* prepare interface data */ | |
1280 | ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, | |
1281 | &dev->kobj, "cpufreq"); | |
1282 | if (ret) { | |
1283 | pr_err("%s: failed to init policy->kobj: %d\n", | |
1284 | __func__, ret); | |
1285 | goto err_init_policy_kobj; | |
1286 | } | |
5a7e56a5 | 1287 | |
988bed09 VK |
1288 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1289 | for_each_cpu(j, policy->related_cpus) | |
1290 | per_cpu(cpufreq_cpu_data, j) = policy; | |
1291 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1292 | } | |
652ed95d | 1293 | |
2ed99e39 | 1294 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
da60ce9f VK |
1295 | policy->cur = cpufreq_driver->get(policy->cpu); |
1296 | if (!policy->cur) { | |
1297 | pr_err("%s: ->get() failed\n", __func__); | |
1298 | goto err_get_freq; | |
1299 | } | |
1300 | } | |
1301 | ||
d3916691 VK |
1302 | /* |
1303 | * Sometimes boot loaders set CPU frequency to a value outside of | |
1304 | * frequency table present with cpufreq core. In such cases CPU might be | |
1305 | * unstable if it has to run on that frequency for long duration of time | |
1306 | * and so its better to set it to a frequency which is specified in | |
1307 | * freq-table. This also makes cpufreq stats inconsistent as | |
1308 | * cpufreq-stats would fail to register because current frequency of CPU | |
1309 | * isn't found in freq-table. | |
1310 | * | |
1311 | * Because we don't want this change to effect boot process badly, we go | |
1312 | * for the next freq which is >= policy->cur ('cur' must be set by now, | |
1313 | * otherwise we will end up setting freq to lowest of the table as 'cur' | |
1314 | * is initialized to zero). | |
1315 | * | |
1316 | * We are passing target-freq as "policy->cur - 1" otherwise | |
1317 | * __cpufreq_driver_target() would simply fail, as policy->cur will be | |
1318 | * equal to target-freq. | |
1319 | */ | |
1320 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) | |
1321 | && has_target()) { | |
1322 | /* Are we running at unknown frequency ? */ | |
1323 | ret = cpufreq_frequency_table_get_index(policy, policy->cur); | |
1324 | if (ret == -EINVAL) { | |
1325 | /* Warn user and fix it */ | |
1326 | pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n", | |
1327 | __func__, policy->cpu, policy->cur); | |
1328 | ret = __cpufreq_driver_target(policy, policy->cur - 1, | |
1329 | CPUFREQ_RELATION_L); | |
1330 | ||
1331 | /* | |
1332 | * Reaching here after boot in a few seconds may not | |
1333 | * mean that system will remain stable at "unknown" | |
1334 | * frequency for longer duration. Hence, a BUG_ON(). | |
1335 | */ | |
1336 | BUG_ON(ret); | |
1337 | pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n", | |
1338 | __func__, policy->cpu, policy->cur); | |
1339 | } | |
1340 | } | |
1341 | ||
a1531acd TR |
1342 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1343 | CPUFREQ_START, policy); | |
1344 | ||
96bbbe4a | 1345 | if (!recover_policy) { |
308b60e7 | 1346 | ret = cpufreq_add_dev_interface(policy, dev); |
a82fab29 SB |
1347 | if (ret) |
1348 | goto err_out_unregister; | |
fcd7af91 VK |
1349 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
1350 | CPUFREQ_CREATE_POLICY, policy); | |
8ff69732 | 1351 | |
988bed09 VK |
1352 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1353 | list_add(&policy->policy_list, &cpufreq_policy_list); | |
1354 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1355 | } | |
9515f4d6 | 1356 | |
e18f1682 SB |
1357 | cpufreq_init_policy(policy); |
1358 | ||
96bbbe4a | 1359 | if (!recover_policy) { |
08fd8c1c VK |
1360 | policy->user_policy.policy = policy->policy; |
1361 | policy->user_policy.governor = policy->governor; | |
1362 | } | |
4e97b631 | 1363 | up_write(&policy->rwsem); |
08fd8c1c | 1364 | |
038c5b3e | 1365 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
7c45cf31 | 1366 | |
6eed9404 VK |
1367 | up_read(&cpufreq_rwsem); |
1368 | ||
7c45cf31 VK |
1369 | /* Callback for handling stuff after policy is ready */ |
1370 | if (cpufreq_driver->ready) | |
1371 | cpufreq_driver->ready(policy); | |
1372 | ||
2d06d8c4 | 1373 | pr_debug("initialization complete\n"); |
87c32271 | 1374 | |
1da177e4 LT |
1375 | return 0; |
1376 | ||
1da177e4 | 1377 | err_out_unregister: |
652ed95d | 1378 | err_get_freq: |
6d4e81ed TV |
1379 | if (!recover_policy) { |
1380 | kobject_put(&policy->kobj); | |
1381 | wait_for_completion(&policy->kobj_unregister); | |
1382 | } | |
1383 | err_init_policy_kobj: | |
7106e02b PB |
1384 | up_write(&policy->rwsem); |
1385 | ||
da60ce9f VK |
1386 | if (cpufreq_driver->exit) |
1387 | cpufreq_driver->exit(policy); | |
2eaa3e2d | 1388 | err_set_policy_cpu: |
3914d379 | 1389 | if (recover_policy) |
42f921a6 | 1390 | cpufreq_policy_put_kobj(policy); |
e9698cc5 | 1391 | cpufreq_policy_free(policy); |
42f921a6 | 1392 | |
1da177e4 | 1393 | nomem_out: |
6eed9404 VK |
1394 | up_read(&cpufreq_rwsem); |
1395 | ||
1da177e4 LT |
1396 | return ret; |
1397 | } | |
1398 | ||
cedb70af | 1399 | static int __cpufreq_remove_dev_prepare(struct device *dev, |
96bbbe4a | 1400 | struct subsys_interface *sif) |
1da177e4 | 1401 | { |
f9ba680d | 1402 | unsigned int cpu = dev->id, cpus; |
1bfb425b | 1403 | int ret; |
3a3e9e06 | 1404 | struct cpufreq_policy *policy; |
1da177e4 | 1405 | |
b8eed8af | 1406 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
1da177e4 | 1407 | |
988bed09 | 1408 | policy = cpufreq_cpu_get_raw(cpu); |
3a3e9e06 | 1409 | if (!policy) { |
b8eed8af | 1410 | pr_debug("%s: No cpu_data found\n", __func__); |
1da177e4 LT |
1411 | return -EINVAL; |
1412 | } | |
1da177e4 | 1413 | |
9c0ebcf7 | 1414 | if (has_target()) { |
3de9bdeb VK |
1415 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); |
1416 | if (ret) { | |
1417 | pr_err("%s: Failed to stop governor\n", __func__); | |
1418 | return ret; | |
1419 | } | |
db5f2995 | 1420 | } |
1da177e4 | 1421 | |
4573237b | 1422 | down_write(&policy->rwsem); |
3a3e9e06 | 1423 | cpus = cpumask_weight(policy->cpus); |
4573237b VK |
1424 | |
1425 | if (has_target() && cpus == 1) | |
1426 | strncpy(policy->last_governor, policy->governor->name, | |
1427 | CPUFREQ_NAME_LEN); | |
1428 | up_write(&policy->rwsem); | |
084f3493 | 1429 | |
9d16f207 | 1430 | if (cpu != policy->kobj_cpu) { |
6964d91d | 1431 | sysfs_remove_link(&dev->kobj, "cpufreq"); |
73bf0fc2 | 1432 | } else if (cpus > 1) { |
1bfb425b VK |
1433 | /* Nominate new CPU */ |
1434 | int new_cpu = cpumask_any_but(policy->cpus, cpu); | |
1435 | struct device *cpu_dev = get_cpu_device(new_cpu); | |
a82fab29 | 1436 | |
1bfb425b VK |
1437 | sysfs_remove_link(&cpu_dev->kobj, "cpufreq"); |
1438 | ret = update_policy_cpu(policy, new_cpu, cpu_dev); | |
1439 | if (ret) { | |
1440 | if (sysfs_create_link(&cpu_dev->kobj, &policy->kobj, | |
1441 | "cpufreq")) | |
1442 | pr_err("%s: Failed to restore kobj link to cpu:%d\n", | |
1443 | __func__, cpu_dev->id); | |
1444 | return ret; | |
1da177e4 | 1445 | } |
1bfb425b VK |
1446 | |
1447 | if (!cpufreq_suspended) | |
1448 | pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n", | |
1449 | __func__, new_cpu, cpu); | |
789ca243 | 1450 | } else if (cpufreq_driver->stop_cpu) { |
367dc4aa | 1451 | cpufreq_driver->stop_cpu(policy); |
1da177e4 | 1452 | } |
1da177e4 | 1453 | |
cedb70af SB |
1454 | return 0; |
1455 | } | |
1456 | ||
1457 | static int __cpufreq_remove_dev_finish(struct device *dev, | |
96bbbe4a | 1458 | struct subsys_interface *sif) |
cedb70af | 1459 | { |
988bed09 | 1460 | unsigned int cpu = dev->id; |
cedb70af | 1461 | int ret; |
988bed09 | 1462 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); |
cedb70af SB |
1463 | |
1464 | if (!policy) { | |
1465 | pr_debug("%s: No cpu_data found\n", __func__); | |
1466 | return -EINVAL; | |
1467 | } | |
1468 | ||
ad7722da | 1469 | down_write(&policy->rwsem); |
303ae723 | 1470 | cpumask_clear_cpu(cpu, policy->cpus); |
ad7722da | 1471 | up_write(&policy->rwsem); |
cedb70af | 1472 | |
b8eed8af | 1473 | /* If cpu is last user of policy, free policy */ |
988bed09 | 1474 | if (policy_is_inactive(policy)) { |
9c0ebcf7 | 1475 | if (has_target()) { |
3de9bdeb VK |
1476 | ret = __cpufreq_governor(policy, |
1477 | CPUFREQ_GOV_POLICY_EXIT); | |
1478 | if (ret) { | |
1479 | pr_err("%s: Failed to exit governor\n", | |
e837f9b5 | 1480 | __func__); |
3de9bdeb VK |
1481 | return ret; |
1482 | } | |
edab2fbc | 1483 | } |
2a998599 | 1484 | |
96bbbe4a | 1485 | if (!cpufreq_suspended) |
42f921a6 | 1486 | cpufreq_policy_put_kobj(policy); |
7d26e2d5 | 1487 | |
8414809c SB |
1488 | /* |
1489 | * Perform the ->exit() even during light-weight tear-down, | |
1490 | * since this is a core component, and is essential for the | |
1491 | * subsequent light-weight ->init() to succeed. | |
b8eed8af | 1492 | */ |
1c3d85dd | 1493 | if (cpufreq_driver->exit) |
3a3e9e06 | 1494 | cpufreq_driver->exit(policy); |
27ecddc2 | 1495 | |
96bbbe4a | 1496 | if (!cpufreq_suspended) |
3a3e9e06 | 1497 | cpufreq_policy_free(policy); |
e5c87b76 SK |
1498 | } else if (has_target()) { |
1499 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
1500 | if (!ret) | |
1501 | ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1502 | ||
1503 | if (ret) { | |
1504 | pr_err("%s: Failed to start governor\n", __func__); | |
1505 | return ret; | |
2a998599 | 1506 | } |
27ecddc2 | 1507 | } |
1da177e4 | 1508 | |
1da177e4 LT |
1509 | return 0; |
1510 | } | |
1511 | ||
cedb70af | 1512 | /** |
27a862e9 | 1513 | * cpufreq_remove_dev - remove a CPU device |
cedb70af SB |
1514 | * |
1515 | * Removes the cpufreq interface for a CPU device. | |
cedb70af | 1516 | */ |
8a25a2fd | 1517 | static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
5a01f2e8 | 1518 | { |
8a25a2fd | 1519 | unsigned int cpu = dev->id; |
27a862e9 | 1520 | int ret; |
ec28297a VP |
1521 | |
1522 | if (cpu_is_offline(cpu)) | |
1523 | return 0; | |
1524 | ||
96bbbe4a | 1525 | ret = __cpufreq_remove_dev_prepare(dev, sif); |
27a862e9 VK |
1526 | |
1527 | if (!ret) | |
96bbbe4a | 1528 | ret = __cpufreq_remove_dev_finish(dev, sif); |
27a862e9 VK |
1529 | |
1530 | return ret; | |
5a01f2e8 VP |
1531 | } |
1532 | ||
65f27f38 | 1533 | static void handle_update(struct work_struct *work) |
1da177e4 | 1534 | { |
65f27f38 DH |
1535 | struct cpufreq_policy *policy = |
1536 | container_of(work, struct cpufreq_policy, update); | |
1537 | unsigned int cpu = policy->cpu; | |
2d06d8c4 | 1538 | pr_debug("handle_update for cpu %u called\n", cpu); |
1da177e4 LT |
1539 | cpufreq_update_policy(cpu); |
1540 | } | |
1541 | ||
1542 | /** | |
bb176f7d VK |
1543 | * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're |
1544 | * in deep trouble. | |
a1e1dc41 | 1545 | * @policy: policy managing CPUs |
1da177e4 LT |
1546 | * @new_freq: CPU frequency the CPU actually runs at |
1547 | * | |
29464f28 DJ |
1548 | * We adjust to current frequency first, and need to clean up later. |
1549 | * So either call to cpufreq_update_policy() or schedule handle_update()). | |
1da177e4 | 1550 | */ |
a1e1dc41 | 1551 | static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
e08f5f5b | 1552 | unsigned int new_freq) |
1da177e4 LT |
1553 | { |
1554 | struct cpufreq_freqs freqs; | |
b43a7ffb | 1555 | |
e837f9b5 | 1556 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
a1e1dc41 | 1557 | policy->cur, new_freq); |
1da177e4 | 1558 | |
a1e1dc41 | 1559 | freqs.old = policy->cur; |
1da177e4 | 1560 | freqs.new = new_freq; |
b43a7ffb | 1561 | |
8fec051e VK |
1562 | cpufreq_freq_transition_begin(policy, &freqs); |
1563 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1da177e4 LT |
1564 | } |
1565 | ||
32ee8c3e | 1566 | /** |
4ab70df4 | 1567 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
95235ca2 VP |
1568 | * @cpu: CPU number |
1569 | * | |
1570 | * This is the last known freq, without actually getting it from the driver. | |
1571 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. | |
1572 | */ | |
1573 | unsigned int cpufreq_quick_get(unsigned int cpu) | |
1574 | { | |
9e21ba8b | 1575 | struct cpufreq_policy *policy; |
e08f5f5b | 1576 | unsigned int ret_freq = 0; |
95235ca2 | 1577 | |
1c3d85dd RW |
1578 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) |
1579 | return cpufreq_driver->get(cpu); | |
9e21ba8b DB |
1580 | |
1581 | policy = cpufreq_cpu_get(cpu); | |
95235ca2 | 1582 | if (policy) { |
e08f5f5b | 1583 | ret_freq = policy->cur; |
95235ca2 VP |
1584 | cpufreq_cpu_put(policy); |
1585 | } | |
1586 | ||
4d34a67d | 1587 | return ret_freq; |
95235ca2 VP |
1588 | } |
1589 | EXPORT_SYMBOL(cpufreq_quick_get); | |
1590 | ||
3d737108 JB |
1591 | /** |
1592 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU | |
1593 | * @cpu: CPU number | |
1594 | * | |
1595 | * Just return the max possible frequency for a given CPU. | |
1596 | */ | |
1597 | unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
1598 | { | |
1599 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
1600 | unsigned int ret_freq = 0; | |
1601 | ||
1602 | if (policy) { | |
1603 | ret_freq = policy->max; | |
1604 | cpufreq_cpu_put(policy); | |
1605 | } | |
1606 | ||
1607 | return ret_freq; | |
1608 | } | |
1609 | EXPORT_SYMBOL(cpufreq_quick_get_max); | |
1610 | ||
d92d50a4 | 1611 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
1da177e4 | 1612 | { |
e08f5f5b | 1613 | unsigned int ret_freq = 0; |
5800043b | 1614 | |
1c3d85dd | 1615 | if (!cpufreq_driver->get) |
4d34a67d | 1616 | return ret_freq; |
1da177e4 | 1617 | |
d92d50a4 | 1618 | ret_freq = cpufreq_driver->get(policy->cpu); |
1da177e4 | 1619 | |
11e584cf VK |
1620 | /* Updating inactive policies is invalid, so avoid doing that. */ |
1621 | if (unlikely(policy_is_inactive(policy))) | |
1622 | return ret_freq; | |
1623 | ||
e08f5f5b | 1624 | if (ret_freq && policy->cur && |
1c3d85dd | 1625 | !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { |
e08f5f5b GS |
1626 | /* verify no discrepancy between actual and |
1627 | saved value exists */ | |
1628 | if (unlikely(ret_freq != policy->cur)) { | |
a1e1dc41 | 1629 | cpufreq_out_of_sync(policy, ret_freq); |
1da177e4 LT |
1630 | schedule_work(&policy->update); |
1631 | } | |
1632 | } | |
1633 | ||
4d34a67d | 1634 | return ret_freq; |
5a01f2e8 | 1635 | } |
1da177e4 | 1636 | |
5a01f2e8 VP |
1637 | /** |
1638 | * cpufreq_get - get the current CPU frequency (in kHz) | |
1639 | * @cpu: CPU number | |
1640 | * | |
1641 | * Get the CPU current (static) CPU frequency | |
1642 | */ | |
1643 | unsigned int cpufreq_get(unsigned int cpu) | |
1644 | { | |
999976e0 | 1645 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
5a01f2e8 | 1646 | unsigned int ret_freq = 0; |
5a01f2e8 | 1647 | |
999976e0 AP |
1648 | if (policy) { |
1649 | down_read(&policy->rwsem); | |
d92d50a4 | 1650 | ret_freq = __cpufreq_get(policy); |
999976e0 | 1651 | up_read(&policy->rwsem); |
5a01f2e8 | 1652 | |
999976e0 AP |
1653 | cpufreq_cpu_put(policy); |
1654 | } | |
6eed9404 | 1655 | |
4d34a67d | 1656 | return ret_freq; |
1da177e4 LT |
1657 | } |
1658 | EXPORT_SYMBOL(cpufreq_get); | |
1659 | ||
8a25a2fd KS |
1660 | static struct subsys_interface cpufreq_interface = { |
1661 | .name = "cpufreq", | |
1662 | .subsys = &cpu_subsys, | |
1663 | .add_dev = cpufreq_add_dev, | |
1664 | .remove_dev = cpufreq_remove_dev, | |
e00e56df RW |
1665 | }; |
1666 | ||
e28867ea VK |
1667 | /* |
1668 | * In case platform wants some specific frequency to be configured | |
1669 | * during suspend.. | |
1670 | */ | |
1671 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) | |
1672 | { | |
1673 | int ret; | |
1674 | ||
1675 | if (!policy->suspend_freq) { | |
1676 | pr_err("%s: suspend_freq can't be zero\n", __func__); | |
1677 | return -EINVAL; | |
1678 | } | |
1679 | ||
1680 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, | |
1681 | policy->suspend_freq); | |
1682 | ||
1683 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, | |
1684 | CPUFREQ_RELATION_H); | |
1685 | if (ret) | |
1686 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", | |
1687 | __func__, policy->suspend_freq, ret); | |
1688 | ||
1689 | return ret; | |
1690 | } | |
1691 | EXPORT_SYMBOL(cpufreq_generic_suspend); | |
1692 | ||
42d4dc3f | 1693 | /** |
2f0aea93 | 1694 | * cpufreq_suspend() - Suspend CPUFreq governors |
e00e56df | 1695 | * |
2f0aea93 VK |
1696 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
1697 | * as some platforms can't change frequency after this point in suspend cycle. | |
1698 | * Because some of the devices (like: i2c, regulators, etc) they use for | |
1699 | * changing frequency are suspended quickly after this point. | |
42d4dc3f | 1700 | */ |
2f0aea93 | 1701 | void cpufreq_suspend(void) |
42d4dc3f | 1702 | { |
3a3e9e06 | 1703 | struct cpufreq_policy *policy; |
42d4dc3f | 1704 | |
2f0aea93 VK |
1705 | if (!cpufreq_driver) |
1706 | return; | |
42d4dc3f | 1707 | |
2f0aea93 | 1708 | if (!has_target()) |
b1b12bab | 1709 | goto suspend; |
42d4dc3f | 1710 | |
2f0aea93 VK |
1711 | pr_debug("%s: Suspending Governors\n", __func__); |
1712 | ||
f963735a | 1713 | for_each_active_policy(policy) { |
2f0aea93 VK |
1714 | if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) |
1715 | pr_err("%s: Failed to stop governor for policy: %p\n", | |
1716 | __func__, policy); | |
1717 | else if (cpufreq_driver->suspend | |
1718 | && cpufreq_driver->suspend(policy)) | |
1719 | pr_err("%s: Failed to suspend driver: %p\n", __func__, | |
1720 | policy); | |
42d4dc3f | 1721 | } |
b1b12bab VK |
1722 | |
1723 | suspend: | |
1724 | cpufreq_suspended = true; | |
42d4dc3f BH |
1725 | } |
1726 | ||
1da177e4 | 1727 | /** |
2f0aea93 | 1728 | * cpufreq_resume() - Resume CPUFreq governors |
1da177e4 | 1729 | * |
2f0aea93 VK |
1730 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
1731 | * are suspended with cpufreq_suspend(). | |
1da177e4 | 1732 | */ |
2f0aea93 | 1733 | void cpufreq_resume(void) |
1da177e4 | 1734 | { |
3a3e9e06 | 1735 | struct cpufreq_policy *policy; |
1da177e4 | 1736 | |
2f0aea93 VK |
1737 | if (!cpufreq_driver) |
1738 | return; | |
1da177e4 | 1739 | |
8e30444e LT |
1740 | cpufreq_suspended = false; |
1741 | ||
2f0aea93 | 1742 | if (!has_target()) |
e00e56df | 1743 | return; |
1da177e4 | 1744 | |
2f0aea93 | 1745 | pr_debug("%s: Resuming Governors\n", __func__); |
1da177e4 | 1746 | |
f963735a | 1747 | for_each_active_policy(policy) { |
0c5aa405 VK |
1748 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) |
1749 | pr_err("%s: Failed to resume driver: %p\n", __func__, | |
1750 | policy); | |
1751 | else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) | |
2f0aea93 VK |
1752 | || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) |
1753 | pr_err("%s: Failed to start governor for policy: %p\n", | |
1754 | __func__, policy); | |
2f0aea93 | 1755 | } |
c75de0ac VK |
1756 | |
1757 | /* | |
1758 | * schedule call cpufreq_update_policy() for first-online CPU, as that | |
1759 | * wouldn't be hotplugged-out on suspend. It will verify that the | |
1760 | * current freq is in sync with what we believe it to be. | |
1761 | */ | |
1762 | policy = cpufreq_cpu_get_raw(cpumask_first(cpu_online_mask)); | |
1763 | if (WARN_ON(!policy)) | |
1764 | return; | |
1765 | ||
1766 | schedule_work(&policy->update); | |
2f0aea93 | 1767 | } |
1da177e4 | 1768 | |
9d95046e BP |
1769 | /** |
1770 | * cpufreq_get_current_driver - return current driver's name | |
1771 | * | |
1772 | * Return the name string of the currently loaded cpufreq driver | |
1773 | * or NULL, if none. | |
1774 | */ | |
1775 | const char *cpufreq_get_current_driver(void) | |
1776 | { | |
1c3d85dd RW |
1777 | if (cpufreq_driver) |
1778 | return cpufreq_driver->name; | |
1779 | ||
1780 | return NULL; | |
9d95046e BP |
1781 | } |
1782 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); | |
1da177e4 | 1783 | |
51315cdf TP |
1784 | /** |
1785 | * cpufreq_get_driver_data - return current driver data | |
1786 | * | |
1787 | * Return the private data of the currently loaded cpufreq | |
1788 | * driver, or NULL if no cpufreq driver is loaded. | |
1789 | */ | |
1790 | void *cpufreq_get_driver_data(void) | |
1791 | { | |
1792 | if (cpufreq_driver) | |
1793 | return cpufreq_driver->driver_data; | |
1794 | ||
1795 | return NULL; | |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); | |
1798 | ||
1da177e4 LT |
1799 | /********************************************************************* |
1800 | * NOTIFIER LISTS INTERFACE * | |
1801 | *********************************************************************/ | |
1802 | ||
1803 | /** | |
1804 | * cpufreq_register_notifier - register a driver with cpufreq | |
1805 | * @nb: notifier function to register | |
1806 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER | |
1807 | * | |
32ee8c3e | 1808 | * Add a driver to one of two lists: either a list of drivers that |
1da177e4 LT |
1809 | * are notified about clock rate changes (once before and once after |
1810 | * the transition), or a list of drivers that are notified about | |
1811 | * changes in cpufreq policy. | |
1812 | * | |
1813 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1814 | * blocking_notifier_chain_register. |
1da177e4 LT |
1815 | */ |
1816 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) | |
1817 | { | |
1818 | int ret; | |
1819 | ||
d5aaffa9 DB |
1820 | if (cpufreq_disabled()) |
1821 | return -EINVAL; | |
1822 | ||
74212ca4 CEB |
1823 | WARN_ON(!init_cpufreq_transition_notifier_list_called); |
1824 | ||
1da177e4 LT |
1825 | switch (list) { |
1826 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1827 | ret = srcu_notifier_chain_register( |
e041c683 | 1828 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1829 | break; |
1830 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1831 | ret = blocking_notifier_chain_register( |
1832 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1833 | break; |
1834 | default: | |
1835 | ret = -EINVAL; | |
1836 | } | |
1da177e4 LT |
1837 | |
1838 | return ret; | |
1839 | } | |
1840 | EXPORT_SYMBOL(cpufreq_register_notifier); | |
1841 | ||
1da177e4 LT |
1842 | /** |
1843 | * cpufreq_unregister_notifier - unregister a driver with cpufreq | |
1844 | * @nb: notifier block to be unregistered | |
bb176f7d | 1845 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER |
1da177e4 LT |
1846 | * |
1847 | * Remove a driver from the CPU frequency notifier list. | |
1848 | * | |
1849 | * This function may sleep, and has the same return conditions as | |
e041c683 | 1850 | * blocking_notifier_chain_unregister. |
1da177e4 LT |
1851 | */ |
1852 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) | |
1853 | { | |
1854 | int ret; | |
1855 | ||
d5aaffa9 DB |
1856 | if (cpufreq_disabled()) |
1857 | return -EINVAL; | |
1858 | ||
1da177e4 LT |
1859 | switch (list) { |
1860 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b4dfdbb3 | 1861 | ret = srcu_notifier_chain_unregister( |
e041c683 | 1862 | &cpufreq_transition_notifier_list, nb); |
1da177e4 LT |
1863 | break; |
1864 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
1865 | ret = blocking_notifier_chain_unregister( |
1866 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
1867 | break; |
1868 | default: | |
1869 | ret = -EINVAL; | |
1870 | } | |
1da177e4 LT |
1871 | |
1872 | return ret; | |
1873 | } | |
1874 | EXPORT_SYMBOL(cpufreq_unregister_notifier); | |
1875 | ||
1876 | ||
1877 | /********************************************************************* | |
1878 | * GOVERNORS * | |
1879 | *********************************************************************/ | |
1880 | ||
1c03a2d0 VK |
1881 | /* Must set freqs->new to intermediate frequency */ |
1882 | static int __target_intermediate(struct cpufreq_policy *policy, | |
1883 | struct cpufreq_freqs *freqs, int index) | |
1884 | { | |
1885 | int ret; | |
1886 | ||
1887 | freqs->new = cpufreq_driver->get_intermediate(policy, index); | |
1888 | ||
1889 | /* We don't need to switch to intermediate freq */ | |
1890 | if (!freqs->new) | |
1891 | return 0; | |
1892 | ||
1893 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", | |
1894 | __func__, policy->cpu, freqs->old, freqs->new); | |
1895 | ||
1896 | cpufreq_freq_transition_begin(policy, freqs); | |
1897 | ret = cpufreq_driver->target_intermediate(policy, index); | |
1898 | cpufreq_freq_transition_end(policy, freqs, ret); | |
1899 | ||
1900 | if (ret) | |
1901 | pr_err("%s: Failed to change to intermediate frequency: %d\n", | |
1902 | __func__, ret); | |
1903 | ||
1904 | return ret; | |
1905 | } | |
1906 | ||
8d65775d VK |
1907 | static int __target_index(struct cpufreq_policy *policy, |
1908 | struct cpufreq_frequency_table *freq_table, int index) | |
1909 | { | |
1c03a2d0 VK |
1910 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
1911 | unsigned int intermediate_freq = 0; | |
8d65775d VK |
1912 | int retval = -EINVAL; |
1913 | bool notify; | |
1914 | ||
1915 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); | |
8d65775d | 1916 | if (notify) { |
1c03a2d0 VK |
1917 | /* Handle switching to intermediate frequency */ |
1918 | if (cpufreq_driver->get_intermediate) { | |
1919 | retval = __target_intermediate(policy, &freqs, index); | |
1920 | if (retval) | |
1921 | return retval; | |
1922 | ||
1923 | intermediate_freq = freqs.new; | |
1924 | /* Set old freq to intermediate */ | |
1925 | if (intermediate_freq) | |
1926 | freqs.old = freqs.new; | |
1927 | } | |
8d65775d | 1928 | |
1c03a2d0 | 1929 | freqs.new = freq_table[index].frequency; |
8d65775d VK |
1930 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
1931 | __func__, policy->cpu, freqs.old, freqs.new); | |
1932 | ||
1933 | cpufreq_freq_transition_begin(policy, &freqs); | |
1934 | } | |
1935 | ||
1936 | retval = cpufreq_driver->target_index(policy, index); | |
1937 | if (retval) | |
1938 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, | |
1939 | retval); | |
1940 | ||
1c03a2d0 | 1941 | if (notify) { |
8d65775d VK |
1942 | cpufreq_freq_transition_end(policy, &freqs, retval); |
1943 | ||
1c03a2d0 VK |
1944 | /* |
1945 | * Failed after setting to intermediate freq? Driver should have | |
1946 | * reverted back to initial frequency and so should we. Check | |
1947 | * here for intermediate_freq instead of get_intermediate, in | |
58405af6 | 1948 | * case we haven't switched to intermediate freq at all. |
1c03a2d0 VK |
1949 | */ |
1950 | if (unlikely(retval && intermediate_freq)) { | |
1951 | freqs.old = intermediate_freq; | |
1952 | freqs.new = policy->restore_freq; | |
1953 | cpufreq_freq_transition_begin(policy, &freqs); | |
1954 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1955 | } | |
1956 | } | |
1957 | ||
8d65775d VK |
1958 | return retval; |
1959 | } | |
1960 | ||
1da177e4 LT |
1961 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
1962 | unsigned int target_freq, | |
1963 | unsigned int relation) | |
1964 | { | |
7249924e | 1965 | unsigned int old_target_freq = target_freq; |
8d65775d | 1966 | int retval = -EINVAL; |
c32b6b8e | 1967 | |
a7b422cd KRW |
1968 | if (cpufreq_disabled()) |
1969 | return -ENODEV; | |
1970 | ||
7249924e VK |
1971 | /* Make sure that target_freq is within supported range */ |
1972 | if (target_freq > policy->max) | |
1973 | target_freq = policy->max; | |
1974 | if (target_freq < policy->min) | |
1975 | target_freq = policy->min; | |
1976 | ||
1977 | pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", | |
e837f9b5 | 1978 | policy->cpu, target_freq, relation, old_target_freq); |
5a1c0228 | 1979 | |
9c0ebcf7 VK |
1980 | /* |
1981 | * This might look like a redundant call as we are checking it again | |
1982 | * after finding index. But it is left intentionally for cases where | |
1983 | * exactly same freq is called again and so we can save on few function | |
1984 | * calls. | |
1985 | */ | |
5a1c0228 VK |
1986 | if (target_freq == policy->cur) |
1987 | return 0; | |
1988 | ||
1c03a2d0 VK |
1989 | /* Save last value to restore later on errors */ |
1990 | policy->restore_freq = policy->cur; | |
1991 | ||
1c3d85dd RW |
1992 | if (cpufreq_driver->target) |
1993 | retval = cpufreq_driver->target(policy, target_freq, relation); | |
9c0ebcf7 VK |
1994 | else if (cpufreq_driver->target_index) { |
1995 | struct cpufreq_frequency_table *freq_table; | |
1996 | int index; | |
90d45d17 | 1997 | |
9c0ebcf7 VK |
1998 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
1999 | if (unlikely(!freq_table)) { | |
2000 | pr_err("%s: Unable to find freq_table\n", __func__); | |
2001 | goto out; | |
2002 | } | |
2003 | ||
2004 | retval = cpufreq_frequency_table_target(policy, freq_table, | |
2005 | target_freq, relation, &index); | |
2006 | if (unlikely(retval)) { | |
2007 | pr_err("%s: Unable to find matching freq\n", __func__); | |
2008 | goto out; | |
2009 | } | |
2010 | ||
d4019f0a | 2011 | if (freq_table[index].frequency == policy->cur) { |
9c0ebcf7 | 2012 | retval = 0; |
d4019f0a VK |
2013 | goto out; |
2014 | } | |
2015 | ||
8d65775d | 2016 | retval = __target_index(policy, freq_table, index); |
9c0ebcf7 VK |
2017 | } |
2018 | ||
2019 | out: | |
1da177e4 LT |
2020 | return retval; |
2021 | } | |
2022 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); | |
2023 | ||
1da177e4 LT |
2024 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
2025 | unsigned int target_freq, | |
2026 | unsigned int relation) | |
2027 | { | |
f1829e4a | 2028 | int ret = -EINVAL; |
1da177e4 | 2029 | |
ad7722da | 2030 | down_write(&policy->rwsem); |
1da177e4 LT |
2031 | |
2032 | ret = __cpufreq_driver_target(policy, target_freq, relation); | |
2033 | ||
ad7722da | 2034 | up_write(&policy->rwsem); |
1da177e4 | 2035 | |
1da177e4 LT |
2036 | return ret; |
2037 | } | |
2038 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); | |
2039 | ||
e08f5f5b GS |
2040 | static int __cpufreq_governor(struct cpufreq_policy *policy, |
2041 | unsigned int event) | |
1da177e4 | 2042 | { |
cc993cab | 2043 | int ret; |
6afde10c TR |
2044 | |
2045 | /* Only must be defined when default governor is known to have latency | |
2046 | restrictions, like e.g. conservative or ondemand. | |
2047 | That this is the case is already ensured in Kconfig | |
2048 | */ | |
2049 | #ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE | |
2050 | struct cpufreq_governor *gov = &cpufreq_gov_performance; | |
2051 | #else | |
2052 | struct cpufreq_governor *gov = NULL; | |
2053 | #endif | |
1c256245 | 2054 | |
2f0aea93 VK |
2055 | /* Don't start any governor operations if we are entering suspend */ |
2056 | if (cpufreq_suspended) | |
2057 | return 0; | |
cb57720b EZ |
2058 | /* |
2059 | * Governor might not be initiated here if ACPI _PPC changed | |
2060 | * notification happened, so check it. | |
2061 | */ | |
2062 | if (!policy->governor) | |
2063 | return -EINVAL; | |
2f0aea93 | 2064 | |
1c256245 TR |
2065 | if (policy->governor->max_transition_latency && |
2066 | policy->cpuinfo.transition_latency > | |
2067 | policy->governor->max_transition_latency) { | |
6afde10c TR |
2068 | if (!gov) |
2069 | return -EINVAL; | |
2070 | else { | |
e837f9b5 JP |
2071 | pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", |
2072 | policy->governor->name, gov->name); | |
6afde10c TR |
2073 | policy->governor = gov; |
2074 | } | |
1c256245 | 2075 | } |
1da177e4 | 2076 | |
fe492f3f VK |
2077 | if (event == CPUFREQ_GOV_POLICY_INIT) |
2078 | if (!try_module_get(policy->governor->owner)) | |
2079 | return -EINVAL; | |
1da177e4 | 2080 | |
2d06d8c4 | 2081 | pr_debug("__cpufreq_governor for CPU %u, event %u\n", |
e837f9b5 | 2082 | policy->cpu, event); |
95731ebb XC |
2083 | |
2084 | mutex_lock(&cpufreq_governor_lock); | |
56d07db2 | 2085 | if ((policy->governor_enabled && event == CPUFREQ_GOV_START) |
f73d3933 VK |
2086 | || (!policy->governor_enabled |
2087 | && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { | |
95731ebb XC |
2088 | mutex_unlock(&cpufreq_governor_lock); |
2089 | return -EBUSY; | |
2090 | } | |
2091 | ||
2092 | if (event == CPUFREQ_GOV_STOP) | |
2093 | policy->governor_enabled = false; | |
2094 | else if (event == CPUFREQ_GOV_START) | |
2095 | policy->governor_enabled = true; | |
2096 | ||
2097 | mutex_unlock(&cpufreq_governor_lock); | |
2098 | ||
1da177e4 LT |
2099 | ret = policy->governor->governor(policy, event); |
2100 | ||
4d5dcc42 VK |
2101 | if (!ret) { |
2102 | if (event == CPUFREQ_GOV_POLICY_INIT) | |
2103 | policy->governor->initialized++; | |
2104 | else if (event == CPUFREQ_GOV_POLICY_EXIT) | |
2105 | policy->governor->initialized--; | |
95731ebb XC |
2106 | } else { |
2107 | /* Restore original values */ | |
2108 | mutex_lock(&cpufreq_governor_lock); | |
2109 | if (event == CPUFREQ_GOV_STOP) | |
2110 | policy->governor_enabled = true; | |
2111 | else if (event == CPUFREQ_GOV_START) | |
2112 | policy->governor_enabled = false; | |
2113 | mutex_unlock(&cpufreq_governor_lock); | |
4d5dcc42 | 2114 | } |
b394058f | 2115 | |
fe492f3f VK |
2116 | if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || |
2117 | ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret)) | |
1da177e4 LT |
2118 | module_put(policy->governor->owner); |
2119 | ||
2120 | return ret; | |
2121 | } | |
2122 | ||
1da177e4 LT |
2123 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
2124 | { | |
3bcb09a3 | 2125 | int err; |
1da177e4 LT |
2126 | |
2127 | if (!governor) | |
2128 | return -EINVAL; | |
2129 | ||
a7b422cd KRW |
2130 | if (cpufreq_disabled()) |
2131 | return -ENODEV; | |
2132 | ||
3fc54d37 | 2133 | mutex_lock(&cpufreq_governor_mutex); |
32ee8c3e | 2134 | |
b394058f | 2135 | governor->initialized = 0; |
3bcb09a3 | 2136 | err = -EBUSY; |
42f91fa1 | 2137 | if (!find_governor(governor->name)) { |
3bcb09a3 JF |
2138 | err = 0; |
2139 | list_add(&governor->governor_list, &cpufreq_governor_list); | |
1da177e4 | 2140 | } |
1da177e4 | 2141 | |
32ee8c3e | 2142 | mutex_unlock(&cpufreq_governor_mutex); |
3bcb09a3 | 2143 | return err; |
1da177e4 LT |
2144 | } |
2145 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); | |
2146 | ||
1da177e4 LT |
2147 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
2148 | { | |
4573237b VK |
2149 | struct cpufreq_policy *policy; |
2150 | unsigned long flags; | |
90e41bac | 2151 | |
1da177e4 LT |
2152 | if (!governor) |
2153 | return; | |
2154 | ||
a7b422cd KRW |
2155 | if (cpufreq_disabled()) |
2156 | return; | |
2157 | ||
4573237b VK |
2158 | /* clear last_governor for all inactive policies */ |
2159 | read_lock_irqsave(&cpufreq_driver_lock, flags); | |
2160 | for_each_inactive_policy(policy) { | |
18bf3a12 VK |
2161 | if (!strcmp(policy->last_governor, governor->name)) { |
2162 | policy->governor = NULL; | |
4573237b | 2163 | strcpy(policy->last_governor, "\0"); |
18bf3a12 | 2164 | } |
90e41bac | 2165 | } |
4573237b | 2166 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
90e41bac | 2167 | |
3fc54d37 | 2168 | mutex_lock(&cpufreq_governor_mutex); |
1da177e4 | 2169 | list_del(&governor->governor_list); |
3fc54d37 | 2170 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 LT |
2171 | return; |
2172 | } | |
2173 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); | |
2174 | ||
2175 | ||
1da177e4 LT |
2176 | /********************************************************************* |
2177 | * POLICY INTERFACE * | |
2178 | *********************************************************************/ | |
2179 | ||
2180 | /** | |
2181 | * cpufreq_get_policy - get the current cpufreq_policy | |
29464f28 DJ |
2182 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
2183 | * is written | |
1da177e4 LT |
2184 | * |
2185 | * Reads the current cpufreq policy. | |
2186 | */ | |
2187 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) | |
2188 | { | |
2189 | struct cpufreq_policy *cpu_policy; | |
2190 | if (!policy) | |
2191 | return -EINVAL; | |
2192 | ||
2193 | cpu_policy = cpufreq_cpu_get(cpu); | |
2194 | if (!cpu_policy) | |
2195 | return -EINVAL; | |
2196 | ||
d5b73cd8 | 2197 | memcpy(policy, cpu_policy, sizeof(*policy)); |
1da177e4 LT |
2198 | |
2199 | cpufreq_cpu_put(cpu_policy); | |
1da177e4 LT |
2200 | return 0; |
2201 | } | |
2202 | EXPORT_SYMBOL(cpufreq_get_policy); | |
2203 | ||
153d7f3f | 2204 | /* |
037ce839 VK |
2205 | * policy : current policy. |
2206 | * new_policy: policy to be set. | |
153d7f3f | 2207 | */ |
037ce839 | 2208 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
3a3e9e06 | 2209 | struct cpufreq_policy *new_policy) |
1da177e4 | 2210 | { |
d9a789c7 RW |
2211 | struct cpufreq_governor *old_gov; |
2212 | int ret; | |
1da177e4 | 2213 | |
e837f9b5 JP |
2214 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
2215 | new_policy->cpu, new_policy->min, new_policy->max); | |
1da177e4 | 2216 | |
d5b73cd8 | 2217 | memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
1da177e4 | 2218 | |
d9a789c7 RW |
2219 | if (new_policy->min > policy->max || new_policy->max < policy->min) |
2220 | return -EINVAL; | |
9c9a43ed | 2221 | |
1da177e4 | 2222 | /* verify the cpu speed can be set within this limit */ |
3a3e9e06 | 2223 | ret = cpufreq_driver->verify(new_policy); |
1da177e4 | 2224 | if (ret) |
d9a789c7 | 2225 | return ret; |
1da177e4 | 2226 | |
1da177e4 | 2227 | /* adjust if necessary - all reasons */ |
e041c683 | 2228 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2229 | CPUFREQ_ADJUST, new_policy); |
1da177e4 LT |
2230 | |
2231 | /* adjust if necessary - hardware incompatibility*/ | |
e041c683 | 2232 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2233 | CPUFREQ_INCOMPATIBLE, new_policy); |
1da177e4 | 2234 | |
bb176f7d VK |
2235 | /* |
2236 | * verify the cpu speed can be set within this limit, which might be | |
2237 | * different to the first one | |
2238 | */ | |
3a3e9e06 | 2239 | ret = cpufreq_driver->verify(new_policy); |
e041c683 | 2240 | if (ret) |
d9a789c7 | 2241 | return ret; |
1da177e4 LT |
2242 | |
2243 | /* notification of the new policy */ | |
e041c683 | 2244 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
3a3e9e06 | 2245 | CPUFREQ_NOTIFY, new_policy); |
1da177e4 | 2246 | |
3a3e9e06 VK |
2247 | policy->min = new_policy->min; |
2248 | policy->max = new_policy->max; | |
1da177e4 | 2249 | |
2d06d8c4 | 2250 | pr_debug("new min and max freqs are %u - %u kHz\n", |
e837f9b5 | 2251 | policy->min, policy->max); |
1da177e4 | 2252 | |
1c3d85dd | 2253 | if (cpufreq_driver->setpolicy) { |
3a3e9e06 | 2254 | policy->policy = new_policy->policy; |
2d06d8c4 | 2255 | pr_debug("setting range\n"); |
d9a789c7 RW |
2256 | return cpufreq_driver->setpolicy(new_policy); |
2257 | } | |
1da177e4 | 2258 | |
d9a789c7 RW |
2259 | if (new_policy->governor == policy->governor) |
2260 | goto out; | |
7bd353a9 | 2261 | |
d9a789c7 RW |
2262 | pr_debug("governor switch\n"); |
2263 | ||
2264 | /* save old, working values */ | |
2265 | old_gov = policy->governor; | |
2266 | /* end old governor */ | |
2267 | if (old_gov) { | |
2268 | __cpufreq_governor(policy, CPUFREQ_GOV_STOP); | |
2269 | up_write(&policy->rwsem); | |
e5c87b76 | 2270 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); |
d9a789c7 | 2271 | down_write(&policy->rwsem); |
1da177e4 LT |
2272 | } |
2273 | ||
d9a789c7 RW |
2274 | /* start new governor */ |
2275 | policy->governor = new_policy->governor; | |
2276 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { | |
2277 | if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) | |
2278 | goto out; | |
2279 | ||
2280 | up_write(&policy->rwsem); | |
2281 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); | |
2282 | down_write(&policy->rwsem); | |
2283 | } | |
2284 | ||
2285 | /* new governor failed, so re-start old one */ | |
2286 | pr_debug("starting governor %s failed\n", policy->governor->name); | |
2287 | if (old_gov) { | |
2288 | policy->governor = old_gov; | |
2289 | __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); | |
2290 | __cpufreq_governor(policy, CPUFREQ_GOV_START); | |
2291 | } | |
2292 | ||
2293 | return -EINVAL; | |
2294 | ||
2295 | out: | |
2296 | pr_debug("governor: change or update limits\n"); | |
2297 | return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
1da177e4 LT |
2298 | } |
2299 | ||
1da177e4 LT |
2300 | /** |
2301 | * cpufreq_update_policy - re-evaluate an existing cpufreq policy | |
2302 | * @cpu: CPU which shall be re-evaluated | |
2303 | * | |
25985edc | 2304 | * Useful for policy notifiers which have different necessities |
1da177e4 LT |
2305 | * at different times. |
2306 | */ | |
2307 | int cpufreq_update_policy(unsigned int cpu) | |
2308 | { | |
3a3e9e06 VK |
2309 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
2310 | struct cpufreq_policy new_policy; | |
f1829e4a | 2311 | int ret; |
1da177e4 | 2312 | |
fefa8ff8 AP |
2313 | if (!policy) |
2314 | return -ENODEV; | |
1da177e4 | 2315 | |
ad7722da | 2316 | down_write(&policy->rwsem); |
1da177e4 | 2317 | |
2d06d8c4 | 2318 | pr_debug("updating policy for CPU %u\n", cpu); |
d5b73cd8 | 2319 | memcpy(&new_policy, policy, sizeof(*policy)); |
3a3e9e06 VK |
2320 | new_policy.min = policy->user_policy.min; |
2321 | new_policy.max = policy->user_policy.max; | |
2322 | new_policy.policy = policy->user_policy.policy; | |
2323 | new_policy.governor = policy->user_policy.governor; | |
1da177e4 | 2324 | |
bb176f7d VK |
2325 | /* |
2326 | * BIOS might change freq behind our back | |
2327 | * -> ask driver for current freq and notify governors about a change | |
2328 | */ | |
2ed99e39 | 2329 | if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { |
3a3e9e06 | 2330 | new_policy.cur = cpufreq_driver->get(cpu); |
bd0fa9bb VK |
2331 | if (WARN_ON(!new_policy.cur)) { |
2332 | ret = -EIO; | |
fefa8ff8 | 2333 | goto unlock; |
bd0fa9bb VK |
2334 | } |
2335 | ||
3a3e9e06 | 2336 | if (!policy->cur) { |
e837f9b5 | 2337 | pr_debug("Driver did not initialize current freq\n"); |
3a3e9e06 | 2338 | policy->cur = new_policy.cur; |
a85f7bd3 | 2339 | } else { |
9c0ebcf7 | 2340 | if (policy->cur != new_policy.cur && has_target()) |
a1e1dc41 | 2341 | cpufreq_out_of_sync(policy, new_policy.cur); |
a85f7bd3 | 2342 | } |
0961dd0d TR |
2343 | } |
2344 | ||
037ce839 | 2345 | ret = cpufreq_set_policy(policy, &new_policy); |
1da177e4 | 2346 | |
fefa8ff8 | 2347 | unlock: |
ad7722da | 2348 | up_write(&policy->rwsem); |
5a01f2e8 | 2349 | |
3a3e9e06 | 2350 | cpufreq_cpu_put(policy); |
1da177e4 LT |
2351 | return ret; |
2352 | } | |
2353 | EXPORT_SYMBOL(cpufreq_update_policy); | |
2354 | ||
2760984f | 2355 | static int cpufreq_cpu_callback(struct notifier_block *nfb, |
c32b6b8e AR |
2356 | unsigned long action, void *hcpu) |
2357 | { | |
2358 | unsigned int cpu = (unsigned long)hcpu; | |
8a25a2fd | 2359 | struct device *dev; |
c32b6b8e | 2360 | |
8a25a2fd KS |
2361 | dev = get_cpu_device(cpu); |
2362 | if (dev) { | |
5302c3fb | 2363 | switch (action & ~CPU_TASKS_FROZEN) { |
c32b6b8e | 2364 | case CPU_ONLINE: |
23faf0b7 | 2365 | cpufreq_add_dev(dev, NULL); |
c32b6b8e | 2366 | break; |
5302c3fb | 2367 | |
c32b6b8e | 2368 | case CPU_DOWN_PREPARE: |
96bbbe4a | 2369 | __cpufreq_remove_dev_prepare(dev, NULL); |
1aee40ac SB |
2370 | break; |
2371 | ||
2372 | case CPU_POST_DEAD: | |
96bbbe4a | 2373 | __cpufreq_remove_dev_finish(dev, NULL); |
c32b6b8e | 2374 | break; |
5302c3fb | 2375 | |
5a01f2e8 | 2376 | case CPU_DOWN_FAILED: |
23faf0b7 | 2377 | cpufreq_add_dev(dev, NULL); |
c32b6b8e AR |
2378 | break; |
2379 | } | |
2380 | } | |
2381 | return NOTIFY_OK; | |
2382 | } | |
2383 | ||
9c36f746 | 2384 | static struct notifier_block __refdata cpufreq_cpu_notifier = { |
bb176f7d | 2385 | .notifier_call = cpufreq_cpu_callback, |
c32b6b8e | 2386 | }; |
1da177e4 | 2387 | |
6f19efc0 LM |
2388 | /********************************************************************* |
2389 | * BOOST * | |
2390 | *********************************************************************/ | |
2391 | static int cpufreq_boost_set_sw(int state) | |
2392 | { | |
2393 | struct cpufreq_frequency_table *freq_table; | |
2394 | struct cpufreq_policy *policy; | |
2395 | int ret = -EINVAL; | |
2396 | ||
f963735a | 2397 | for_each_active_policy(policy) { |
6f19efc0 LM |
2398 | freq_table = cpufreq_frequency_get_table(policy->cpu); |
2399 | if (freq_table) { | |
2400 | ret = cpufreq_frequency_table_cpuinfo(policy, | |
2401 | freq_table); | |
2402 | if (ret) { | |
2403 | pr_err("%s: Policy frequency update failed\n", | |
2404 | __func__); | |
2405 | break; | |
2406 | } | |
2407 | policy->user_policy.max = policy->max; | |
2408 | __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); | |
2409 | } | |
2410 | } | |
2411 | ||
2412 | return ret; | |
2413 | } | |
2414 | ||
2415 | int cpufreq_boost_trigger_state(int state) | |
2416 | { | |
2417 | unsigned long flags; | |
2418 | int ret = 0; | |
2419 | ||
2420 | if (cpufreq_driver->boost_enabled == state) | |
2421 | return 0; | |
2422 | ||
2423 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2424 | cpufreq_driver->boost_enabled = state; | |
2425 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2426 | ||
2427 | ret = cpufreq_driver->set_boost(state); | |
2428 | if (ret) { | |
2429 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2430 | cpufreq_driver->boost_enabled = !state; | |
2431 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2432 | ||
e837f9b5 JP |
2433 | pr_err("%s: Cannot %s BOOST\n", |
2434 | __func__, state ? "enable" : "disable"); | |
6f19efc0 LM |
2435 | } |
2436 | ||
2437 | return ret; | |
2438 | } | |
2439 | ||
2440 | int cpufreq_boost_supported(void) | |
2441 | { | |
2442 | if (likely(cpufreq_driver)) | |
2443 | return cpufreq_driver->boost_supported; | |
2444 | ||
2445 | return 0; | |
2446 | } | |
2447 | EXPORT_SYMBOL_GPL(cpufreq_boost_supported); | |
2448 | ||
2449 | int cpufreq_boost_enabled(void) | |
2450 | { | |
2451 | return cpufreq_driver->boost_enabled; | |
2452 | } | |
2453 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); | |
2454 | ||
1da177e4 LT |
2455 | /********************************************************************* |
2456 | * REGISTER / UNREGISTER CPUFREQ DRIVER * | |
2457 | *********************************************************************/ | |
2458 | ||
2459 | /** | |
2460 | * cpufreq_register_driver - register a CPU Frequency driver | |
2461 | * @driver_data: A struct cpufreq_driver containing the values# | |
2462 | * submitted by the CPU Frequency driver. | |
2463 | * | |
bb176f7d | 2464 | * Registers a CPU Frequency driver to this core code. This code |
1da177e4 | 2465 | * returns zero on success, -EBUSY when another driver got here first |
32ee8c3e | 2466 | * (and isn't unregistered in the meantime). |
1da177e4 LT |
2467 | * |
2468 | */ | |
221dee28 | 2469 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
1da177e4 LT |
2470 | { |
2471 | unsigned long flags; | |
2472 | int ret; | |
2473 | ||
a7b422cd KRW |
2474 | if (cpufreq_disabled()) |
2475 | return -ENODEV; | |
2476 | ||
1da177e4 | 2477 | if (!driver_data || !driver_data->verify || !driver_data->init || |
9c0ebcf7 | 2478 | !(driver_data->setpolicy || driver_data->target_index || |
9832235f RW |
2479 | driver_data->target) || |
2480 | (driver_data->setpolicy && (driver_data->target_index || | |
1c03a2d0 VK |
2481 | driver_data->target)) || |
2482 | (!!driver_data->get_intermediate != !!driver_data->target_intermediate)) | |
1da177e4 LT |
2483 | return -EINVAL; |
2484 | ||
2d06d8c4 | 2485 | pr_debug("trying to register driver %s\n", driver_data->name); |
1da177e4 | 2486 | |
0d1857a1 | 2487 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2488 | if (cpufreq_driver) { |
0d1857a1 | 2489 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
4dea5806 | 2490 | return -EEXIST; |
1da177e4 | 2491 | } |
1c3d85dd | 2492 | cpufreq_driver = driver_data; |
0d1857a1 | 2493 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 2494 | |
bc68b7df VK |
2495 | if (driver_data->setpolicy) |
2496 | driver_data->flags |= CPUFREQ_CONST_LOOPS; | |
2497 | ||
6f19efc0 LM |
2498 | if (cpufreq_boost_supported()) { |
2499 | /* | |
2500 | * Check if driver provides function to enable boost - | |
2501 | * if not, use cpufreq_boost_set_sw as default | |
2502 | */ | |
2503 | if (!cpufreq_driver->set_boost) | |
2504 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; | |
2505 | ||
2506 | ret = cpufreq_sysfs_create_file(&boost.attr); | |
2507 | if (ret) { | |
2508 | pr_err("%s: cannot register global BOOST sysfs file\n", | |
e837f9b5 | 2509 | __func__); |
6f19efc0 LM |
2510 | goto err_null_driver; |
2511 | } | |
2512 | } | |
2513 | ||
8a25a2fd | 2514 | ret = subsys_interface_register(&cpufreq_interface); |
8f5bc2ab | 2515 | if (ret) |
6f19efc0 | 2516 | goto err_boost_unreg; |
1da177e4 | 2517 | |
ce1bcfe9 VK |
2518 | if (!(cpufreq_driver->flags & CPUFREQ_STICKY) && |
2519 | list_empty(&cpufreq_policy_list)) { | |
1da177e4 | 2520 | /* if all ->init() calls failed, unregister */ |
ce1bcfe9 VK |
2521 | pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
2522 | driver_data->name); | |
2523 | goto err_if_unreg; | |
1da177e4 LT |
2524 | } |
2525 | ||
8f5bc2ab | 2526 | register_hotcpu_notifier(&cpufreq_cpu_notifier); |
2d06d8c4 | 2527 | pr_debug("driver %s up and running\n", driver_data->name); |
1da177e4 | 2528 | |
8f5bc2ab | 2529 | return 0; |
8a25a2fd KS |
2530 | err_if_unreg: |
2531 | subsys_interface_unregister(&cpufreq_interface); | |
6f19efc0 LM |
2532 | err_boost_unreg: |
2533 | if (cpufreq_boost_supported()) | |
2534 | cpufreq_sysfs_remove_file(&boost.attr); | |
8f5bc2ab | 2535 | err_null_driver: |
0d1857a1 | 2536 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2537 | cpufreq_driver = NULL; |
0d1857a1 | 2538 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
4d34a67d | 2539 | return ret; |
1da177e4 LT |
2540 | } |
2541 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); | |
2542 | ||
1da177e4 LT |
2543 | /** |
2544 | * cpufreq_unregister_driver - unregister the current CPUFreq driver | |
2545 | * | |
bb176f7d | 2546 | * Unregister the current CPUFreq driver. Only call this if you have |
1da177e4 LT |
2547 | * the right to do so, i.e. if you have succeeded in initialising before! |
2548 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is | |
2549 | * currently not initialised. | |
2550 | */ | |
221dee28 | 2551 | int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
1da177e4 LT |
2552 | { |
2553 | unsigned long flags; | |
2554 | ||
1c3d85dd | 2555 | if (!cpufreq_driver || (driver != cpufreq_driver)) |
1da177e4 | 2556 | return -EINVAL; |
1da177e4 | 2557 | |
2d06d8c4 | 2558 | pr_debug("unregistering driver %s\n", driver->name); |
1da177e4 | 2559 | |
8a25a2fd | 2560 | subsys_interface_unregister(&cpufreq_interface); |
6f19efc0 LM |
2561 | if (cpufreq_boost_supported()) |
2562 | cpufreq_sysfs_remove_file(&boost.attr); | |
2563 | ||
65edc68c | 2564 | unregister_hotcpu_notifier(&cpufreq_cpu_notifier); |
1da177e4 | 2565 | |
6eed9404 | 2566 | down_write(&cpufreq_rwsem); |
0d1857a1 | 2567 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
6eed9404 | 2568 | |
1c3d85dd | 2569 | cpufreq_driver = NULL; |
6eed9404 | 2570 | |
0d1857a1 | 2571 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
6eed9404 | 2572 | up_write(&cpufreq_rwsem); |
1da177e4 LT |
2573 | |
2574 | return 0; | |
2575 | } | |
2576 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); | |
5a01f2e8 | 2577 | |
90de2a4a DA |
2578 | /* |
2579 | * Stop cpufreq at shutdown to make sure it isn't holding any locks | |
2580 | * or mutexes when secondary CPUs are halted. | |
2581 | */ | |
2582 | static struct syscore_ops cpufreq_syscore_ops = { | |
2583 | .shutdown = cpufreq_suspend, | |
2584 | }; | |
2585 | ||
5a01f2e8 VP |
2586 | static int __init cpufreq_core_init(void) |
2587 | { | |
a7b422cd KRW |
2588 | if (cpufreq_disabled()) |
2589 | return -ENODEV; | |
2590 | ||
2361be23 | 2591 | cpufreq_global_kobject = kobject_create(); |
8aa84ad8 TR |
2592 | BUG_ON(!cpufreq_global_kobject); |
2593 | ||
90de2a4a DA |
2594 | register_syscore_ops(&cpufreq_syscore_ops); |
2595 | ||
5a01f2e8 VP |
2596 | return 0; |
2597 | } | |
5a01f2e8 | 2598 | core_initcall(cpufreq_core_init); |