Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/drivers/cpufreq/cpufreq.c | |
4 | * | |
5 | * Copyright (C) 2001 Russell King | |
6 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> | |
bb176f7d | 7 | * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org> |
1da177e4 | 8 | * |
c32b6b8e | 9 | * Oct 2005 - Ashok Raj <ashok.raj@intel.com> |
32ee8c3e | 10 | * Added handling for CPU hotplug |
8ff69732 DJ |
11 | * Feb 2006 - Jacob Shin <jacob.shin@amd.com> |
12 | * Fix handling for CPU hotplug -- affected CPUs | |
1da177e4 LT |
13 | */ |
14 | ||
db701151 VK |
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
16 | ||
5ff0a268 | 17 | #include <linux/cpu.h> |
1da177e4 | 18 | #include <linux/cpufreq.h> |
5c238a8b | 19 | #include <linux/cpu_cooling.h> |
1da177e4 | 20 | #include <linux/delay.h> |
1da177e4 | 21 | #include <linux/device.h> |
5ff0a268 VK |
22 | #include <linux/init.h> |
23 | #include <linux/kernel_stat.h> | |
24 | #include <linux/module.h> | |
3fc54d37 | 25 | #include <linux/mutex.h> |
67d874c3 | 26 | #include <linux/pm_qos.h> |
5ff0a268 | 27 | #include <linux/slab.h> |
2f0aea93 | 28 | #include <linux/suspend.h> |
90de2a4a | 29 | #include <linux/syscore_ops.h> |
5ff0a268 | 30 | #include <linux/tick.h> |
f55ae08c | 31 | #include <linux/units.h> |
6f4f2723 TR |
32 | #include <trace/events/power.h> |
33 | ||
b4f0676f | 34 | static LIST_HEAD(cpufreq_policy_list); |
f963735a | 35 | |
f963735a | 36 | /* Macros to iterate over CPU policies */ |
fd7dc7e6 EB |
37 | #define for_each_suitable_policy(__policy, __active) \ |
38 | list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \ | |
39 | if ((__active) == !policy_is_inactive(__policy)) | |
f963735a VK |
40 | |
41 | #define for_each_active_policy(__policy) \ | |
42 | for_each_suitable_policy(__policy, true) | |
43 | #define for_each_inactive_policy(__policy) \ | |
44 | for_each_suitable_policy(__policy, false) | |
45 | ||
f7b27061 VK |
46 | /* Iterate over governors */ |
47 | static LIST_HEAD(cpufreq_governor_list); | |
48 | #define for_each_governor(__governor) \ | |
49 | list_for_each_entry(__governor, &cpufreq_governor_list, governor_list) | |
50 | ||
8412b456 QP |
51 | static char default_governor[CPUFREQ_NAME_LEN]; |
52 | ||
a9909c21 | 53 | /* |
cd878479 | 54 | * The "cpufreq driver" - the arch- or hardware-dependent low |
1da177e4 LT |
55 | * level driver of CPUFreq support, and its spinlock. This lock |
56 | * also protects the cpufreq_cpu_data array. | |
57 | */ | |
1c3d85dd | 58 | static struct cpufreq_driver *cpufreq_driver; |
7a6aedfa | 59 | static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); |
bb176f7d | 60 | static DEFINE_RWLOCK(cpufreq_driver_lock); |
bb176f7d | 61 | |
874f6353 IV |
62 | static DEFINE_STATIC_KEY_FALSE(cpufreq_freq_invariance); |
63 | bool cpufreq_supports_freq_invariance(void) | |
64 | { | |
65 | return static_branch_likely(&cpufreq_freq_invariance); | |
66 | } | |
67 | ||
2f0aea93 VK |
68 | /* Flag to suspend/resume CPUFreq governors */ |
69 | static bool cpufreq_suspended; | |
1da177e4 | 70 | |
9c0ebcf7 VK |
71 | static inline bool has_target(void) |
72 | { | |
73 | return cpufreq_driver->target_index || cpufreq_driver->target; | |
74 | } | |
75 | ||
a038895e VK |
76 | bool has_target_index(void) |
77 | { | |
78 | return !!cpufreq_driver->target_index; | |
79 | } | |
80 | ||
1da177e4 | 81 | /* internal prototypes */ |
d92d50a4 | 82 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
a92604b4 RW |
83 | static int cpufreq_init_governor(struct cpufreq_policy *policy); |
84 | static void cpufreq_exit_governor(struct cpufreq_policy *policy); | |
a92604b4 | 85 | static void cpufreq_governor_limits(struct cpufreq_policy *policy); |
1e4f63ae RW |
86 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
87 | struct cpufreq_governor *new_gov, | |
88 | unsigned int new_pol); | |
218a06a7 | 89 | static bool cpufreq_boost_supported(void); |
45482c70 | 90 | |
a9909c21 | 91 | /* |
32ee8c3e DJ |
92 | * Two notifier lists: the "policy" list is involved in the |
93 | * validation process for a new CPU frequency policy; the | |
1da177e4 LT |
94 | * "transition" list for kernel code that needs to handle |
95 | * changes to devices when the CPU clock speed changes. | |
96 | * The mutex locks both lists. | |
97 | */ | |
e041c683 | 98 | static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
cc85de36 | 99 | SRCU_NOTIFIER_HEAD_STATIC(cpufreq_transition_notifier_list); |
1da177e4 | 100 | |
a7b422cd | 101 | static int off __read_mostly; |
da584455 | 102 | static int cpufreq_disabled(void) |
a7b422cd KRW |
103 | { |
104 | return off; | |
105 | } | |
106 | void disable_cpufreq(void) | |
107 | { | |
108 | off = 1; | |
109 | } | |
29464f28 | 110 | static DEFINE_MUTEX(cpufreq_governor_mutex); |
1da177e4 | 111 | |
4d5dcc42 VK |
112 | bool have_governor_per_policy(void) |
113 | { | |
0b981e70 | 114 | return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
4d5dcc42 | 115 | } |
3f869d6d | 116 | EXPORT_SYMBOL_GPL(have_governor_per_policy); |
4d5dcc42 | 117 | |
183edb20 YL |
118 | static struct kobject *cpufreq_global_kobject; |
119 | ||
944e9a03 VK |
120 | struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
121 | { | |
122 | if (have_governor_per_policy()) | |
123 | return &policy->kobj; | |
124 | else | |
125 | return cpufreq_global_kobject; | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(get_governor_parent_kobj); | |
128 | ||
72a4ce34 VK |
129 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
130 | { | |
5720821b | 131 | struct kernel_cpustat kcpustat; |
72a4ce34 | 132 | u64 cur_wall_time; |
5720821b | 133 | u64 idle_time; |
72a4ce34 VK |
134 | u64 busy_time; |
135 | ||
7fb1327e | 136 | cur_wall_time = jiffies64_to_nsecs(get_jiffies_64()); |
72a4ce34 | 137 | |
5720821b FW |
138 | kcpustat_cpu_fetch(&kcpustat, cpu); |
139 | ||
140 | busy_time = kcpustat.cpustat[CPUTIME_USER]; | |
141 | busy_time += kcpustat.cpustat[CPUTIME_SYSTEM]; | |
142 | busy_time += kcpustat.cpustat[CPUTIME_IRQ]; | |
143 | busy_time += kcpustat.cpustat[CPUTIME_SOFTIRQ]; | |
144 | busy_time += kcpustat.cpustat[CPUTIME_STEAL]; | |
145 | busy_time += kcpustat.cpustat[CPUTIME_NICE]; | |
72a4ce34 VK |
146 | |
147 | idle_time = cur_wall_time - busy_time; | |
148 | if (wall) | |
7fb1327e | 149 | *wall = div_u64(cur_wall_time, NSEC_PER_USEC); |
72a4ce34 | 150 | |
7fb1327e | 151 | return div_u64(idle_time, NSEC_PER_USEC); |
72a4ce34 VK |
152 | } |
153 | ||
154 | u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) | |
155 | { | |
156 | u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); | |
157 | ||
158 | if (idle_time == -1ULL) | |
159 | return get_cpu_idle_time_jiffy(cpu, wall); | |
160 | else if (!io_busy) | |
161 | idle_time += get_cpu_iowait_time_us(cpu, wall); | |
162 | ||
163 | return idle_time; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(get_cpu_idle_time); | |
166 | ||
70e9e778 VK |
167 | /* |
168 | * This is a generic cpufreq init() routine which can be used by cpufreq | |
169 | * drivers of SMP systems. It will do following: | |
170 | * - validate & show freq table passed | |
171 | * - set policies transition latency | |
172 | * - policy->cpus with all possible CPUs | |
173 | */ | |
c4dcc8a1 | 174 | void cpufreq_generic_init(struct cpufreq_policy *policy, |
70e9e778 VK |
175 | struct cpufreq_frequency_table *table, |
176 | unsigned int transition_latency) | |
177 | { | |
92c99d15 | 178 | policy->freq_table = table; |
70e9e778 VK |
179 | policy->cpuinfo.transition_latency = transition_latency; |
180 | ||
181 | /* | |
58405af6 | 182 | * The driver only supports the SMP configuration where all processors |
70e9e778 VK |
183 | * share the clock and voltage and clock. |
184 | */ | |
185 | cpumask_setall(policy->cpus); | |
70e9e778 VK |
186 | } |
187 | EXPORT_SYMBOL_GPL(cpufreq_generic_init); | |
188 | ||
1f0bd44e | 189 | struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
652ed95d VK |
190 | { |
191 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); | |
192 | ||
988bed09 VK |
193 | return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; |
194 | } | |
1f0bd44e | 195 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw); |
988bed09 VK |
196 | |
197 | unsigned int cpufreq_generic_get(unsigned int cpu) | |
198 | { | |
199 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); | |
200 | ||
652ed95d | 201 | if (!policy || IS_ERR(policy->clk)) { |
e837f9b5 JP |
202 | pr_err("%s: No %s associated to cpu: %d\n", |
203 | __func__, policy ? "clk" : "policy", cpu); | |
652ed95d VK |
204 | return 0; |
205 | } | |
206 | ||
207 | return clk_get_rate(policy->clk) / 1000; | |
208 | } | |
209 | EXPORT_SYMBOL_GPL(cpufreq_generic_get); | |
210 | ||
50e9c852 | 211 | /** |
5d094fea RW |
212 | * cpufreq_cpu_get - Return policy for a CPU and mark it as busy. |
213 | * @cpu: CPU to find the policy for. | |
50e9c852 | 214 | * |
5d094fea RW |
215 | * Call cpufreq_cpu_get_raw() to obtain a cpufreq policy for @cpu and increment |
216 | * the kobject reference counter of that policy. Return a valid policy on | |
217 | * success or NULL on failure. | |
50e9c852 | 218 | * |
5d094fea RW |
219 | * The policy returned by this function has to be released with the help of |
220 | * cpufreq_cpu_put() to balance its kobject reference counter properly. | |
50e9c852 | 221 | */ |
6eed9404 | 222 | struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
1da177e4 | 223 | { |
6eed9404 | 224 | struct cpufreq_policy *policy = NULL; |
1da177e4 LT |
225 | unsigned long flags; |
226 | ||
1b947c90 | 227 | if (WARN_ON(cpu >= nr_cpu_ids)) |
6eed9404 VK |
228 | return NULL; |
229 | ||
1da177e4 | 230 | /* get the cpufreq driver */ |
1c3d85dd | 231 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
1da177e4 | 232 | |
6eed9404 VK |
233 | if (cpufreq_driver) { |
234 | /* get the CPU */ | |
988bed09 | 235 | policy = cpufreq_cpu_get_raw(cpu); |
6eed9404 VK |
236 | if (policy) |
237 | kobject_get(&policy->kobj); | |
238 | } | |
1da177e4 | 239 | |
6eed9404 | 240 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 241 | |
3a3e9e06 | 242 | return policy; |
a9144436 | 243 | } |
1da177e4 LT |
244 | EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
245 | ||
50e9c852 | 246 | /** |
5d094fea RW |
247 | * cpufreq_cpu_put - Decrement kobject usage counter for cpufreq policy. |
248 | * @policy: cpufreq policy returned by cpufreq_cpu_get(). | |
50e9c852 | 249 | */ |
3a3e9e06 | 250 | void cpufreq_cpu_put(struct cpufreq_policy *policy) |
1da177e4 | 251 | { |
6eed9404 | 252 | kobject_put(&policy->kobj); |
1da177e4 LT |
253 | } |
254 | EXPORT_SYMBOL_GPL(cpufreq_cpu_put); | |
255 | ||
540a3758 RW |
256 | /** |
257 | * cpufreq_cpu_release - Unlock a policy and decrement its usage counter. | |
258 | * @policy: cpufreq policy returned by cpufreq_cpu_acquire(). | |
259 | */ | |
9083e498 | 260 | void cpufreq_cpu_release(struct cpufreq_policy *policy) |
540a3758 RW |
261 | { |
262 | if (WARN_ON(!policy)) | |
263 | return; | |
264 | ||
265 | lockdep_assert_held(&policy->rwsem); | |
266 | ||
267 | up_write(&policy->rwsem); | |
268 | ||
269 | cpufreq_cpu_put(policy); | |
270 | } | |
271 | ||
272 | /** | |
273 | * cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it. | |
274 | * @cpu: CPU to find the policy for. | |
275 | * | |
276 | * Call cpufreq_cpu_get() to get a reference on the cpufreq policy for @cpu and | |
277 | * if the policy returned by it is not NULL, acquire its rwsem for writing. | |
278 | * Return the policy if it is active or release it and return NULL otherwise. | |
279 | * | |
280 | * The policy returned by this function has to be released with the help of | |
281 | * cpufreq_cpu_release() in order to release its rwsem and balance its usage | |
282 | * counter properly. | |
283 | */ | |
9083e498 | 284 | struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu) |
540a3758 RW |
285 | { |
286 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
287 | ||
288 | if (!policy) | |
289 | return NULL; | |
290 | ||
291 | down_write(&policy->rwsem); | |
292 | ||
293 | if (policy_is_inactive(policy)) { | |
294 | cpufreq_cpu_release(policy); | |
295 | return NULL; | |
296 | } | |
297 | ||
298 | return policy; | |
299 | } | |
300 | ||
1da177e4 LT |
301 | /********************************************************************* |
302 | * EXTERNALLY AFFECTING FREQUENCY CHANGES * | |
303 | *********************************************************************/ | |
304 | ||
ec06e586 RW |
305 | /** |
306 | * adjust_jiffies - Adjust the system "loops_per_jiffy". | |
307 | * @val: CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE. | |
308 | * @ci: Frequency change information. | |
1da177e4 LT |
309 | * |
310 | * This function alters the system "loops_per_jiffy" for the clock | |
311 | * speed change. Note that loops_per_jiffy cannot be updated on SMP | |
32ee8c3e | 312 | * systems as each CPU might be scaled differently. So, use the arch |
1da177e4 LT |
313 | * per-CPU loops_per_jiffy value wherever possible. |
314 | */ | |
858119e1 | 315 | static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
1da177e4 | 316 | { |
39c132ee VK |
317 | #ifndef CONFIG_SMP |
318 | static unsigned long l_p_j_ref; | |
319 | static unsigned int l_p_j_ref_freq; | |
320 | ||
1da177e4 LT |
321 | if (ci->flags & CPUFREQ_CONST_LOOPS) |
322 | return; | |
323 | ||
324 | if (!l_p_j_ref_freq) { | |
325 | l_p_j_ref = loops_per_jiffy; | |
326 | l_p_j_ref_freq = ci->old; | |
e837f9b5 JP |
327 | pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
328 | l_p_j_ref, l_p_j_ref_freq); | |
1da177e4 | 329 | } |
0b443ead | 330 | if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
e08f5f5b GS |
331 | loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
332 | ci->new); | |
e837f9b5 JP |
333 | pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
334 | loops_per_jiffy, ci->new); | |
1da177e4 | 335 | } |
1da177e4 | 336 | #endif |
39c132ee | 337 | } |
1da177e4 | 338 | |
20b5324d | 339 | /** |
ec06e586 | 340 | * cpufreq_notify_transition - Notify frequency transition and adjust jiffies. |
20b5324d VK |
341 | * @policy: cpufreq policy to enable fast frequency switching for. |
342 | * @freqs: contain details of the frequency update. | |
343 | * @state: set to CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE. | |
344 | * | |
ec06e586 RW |
345 | * This function calls the transition notifiers and adjust_jiffies(). |
346 | * | |
347 | * It is called twice on all CPU frequency changes that have external effects. | |
20b5324d VK |
348 | */ |
349 | static void cpufreq_notify_transition(struct cpufreq_policy *policy, | |
350 | struct cpufreq_freqs *freqs, | |
351 | unsigned int state) | |
1da177e4 | 352 | { |
df24014a VK |
353 | int cpu; |
354 | ||
1da177e4 LT |
355 | BUG_ON(irqs_disabled()); |
356 | ||
d5aaffa9 DB |
357 | if (cpufreq_disabled()) |
358 | return; | |
359 | ||
df24014a | 360 | freqs->policy = policy; |
1c3d85dd | 361 | freqs->flags = cpufreq_driver->flags; |
2d06d8c4 | 362 | pr_debug("notification %u of frequency transition to %u kHz\n", |
e837f9b5 | 363 | state, freqs->new); |
1da177e4 | 364 | |
1da177e4 LT |
365 | switch (state) { |
366 | case CPUFREQ_PRECHANGE: | |
20b5324d VK |
367 | /* |
368 | * Detect if the driver reported a value as "old frequency" | |
e4472cb3 DJ |
369 | * which is not equal to what the cpufreq core thinks is |
370 | * "old frequency". | |
1da177e4 | 371 | */ |
98015228 VK |
372 | if (policy->cur && policy->cur != freqs->old) { |
373 | pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", | |
374 | freqs->old, policy->cur); | |
375 | freqs->old = policy->cur; | |
1da177e4 | 376 | } |
20b5324d | 377 | |
df24014a VK |
378 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
379 | CPUFREQ_PRECHANGE, freqs); | |
20b5324d | 380 | |
1da177e4 LT |
381 | adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
382 | break; | |
e4472cb3 | 383 | |
1da177e4 LT |
384 | case CPUFREQ_POSTCHANGE: |
385 | adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); | |
20b5324d VK |
386 | pr_debug("FREQ: %u - CPUs: %*pbl\n", freqs->new, |
387 | cpumask_pr_args(policy->cpus)); | |
388 | ||
df24014a VK |
389 | for_each_cpu(cpu, policy->cpus) |
390 | trace_cpu_frequency(freqs->new, cpu); | |
391 | ||
392 | srcu_notifier_call_chain(&cpufreq_transition_notifier_list, | |
393 | CPUFREQ_POSTCHANGE, freqs); | |
20b5324d | 394 | |
1aefc75b | 395 | cpufreq_stats_record_transition(policy, freqs->new); |
20b5324d | 396 | policy->cur = freqs->new; |
1da177e4 | 397 | } |
1da177e4 | 398 | } |
bb176f7d | 399 | |
f7ba3b41 | 400 | /* Do post notifications when there are chances that transition has failed */ |
236a9800 | 401 | static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
f7ba3b41 VK |
402 | struct cpufreq_freqs *freqs, int transition_failed) |
403 | { | |
404 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
405 | if (!transition_failed) | |
406 | return; | |
407 | ||
408 | swap(freqs->old, freqs->new); | |
409 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
410 | cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); | |
411 | } | |
f7ba3b41 | 412 | |
12478cf0 SB |
413 | void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
414 | struct cpufreq_freqs *freqs) | |
415 | { | |
ca654dc3 SB |
416 | |
417 | /* | |
418 | * Catch double invocations of _begin() which lead to self-deadlock. | |
419 | * ASYNC_NOTIFICATION drivers are left out because the cpufreq core | |
420 | * doesn't invoke _begin() on their behalf, and hence the chances of | |
421 | * double invocations are very low. Moreover, there are scenarios | |
422 | * where these checks can emit false-positive warnings in these | |
423 | * drivers; so we avoid that by skipping them altogether. | |
424 | */ | |
425 | WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) | |
426 | && current == policy->transition_task); | |
427 | ||
12478cf0 SB |
428 | wait: |
429 | wait_event(policy->transition_wait, !policy->transition_ongoing); | |
430 | ||
431 | spin_lock(&policy->transition_lock); | |
432 | ||
433 | if (unlikely(policy->transition_ongoing)) { | |
434 | spin_unlock(&policy->transition_lock); | |
435 | goto wait; | |
436 | } | |
437 | ||
438 | policy->transition_ongoing = true; | |
ca654dc3 | 439 | policy->transition_task = current; |
12478cf0 SB |
440 | |
441 | spin_unlock(&policy->transition_lock); | |
442 | ||
443 | cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); | |
446 | ||
447 | void cpufreq_freq_transition_end(struct cpufreq_policy *policy, | |
448 | struct cpufreq_freqs *freqs, int transition_failed) | |
449 | { | |
0e7ea2f3 | 450 | if (WARN_ON(!policy->transition_ongoing)) |
12478cf0 SB |
451 | return; |
452 | ||
453 | cpufreq_notify_post_transition(policy, freqs, transition_failed); | |
454 | ||
1a0419b0 IV |
455 | arch_set_freq_scale(policy->related_cpus, |
456 | policy->cur, | |
599457ba | 457 | arch_scale_freq_ref(policy->cpu)); |
1a0419b0 | 458 | |
61bfbf79 | 459 | spin_lock(&policy->transition_lock); |
12478cf0 | 460 | policy->transition_ongoing = false; |
ca654dc3 | 461 | policy->transition_task = NULL; |
61bfbf79 | 462 | spin_unlock(&policy->transition_lock); |
12478cf0 SB |
463 | |
464 | wake_up(&policy->transition_wait); | |
465 | } | |
466 | EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); | |
467 | ||
b7898fda RW |
468 | /* |
469 | * Fast frequency switching status count. Positive means "enabled", negative | |
470 | * means "disabled" and 0 means "not decided yet". | |
471 | */ | |
472 | static int cpufreq_fast_switch_count; | |
473 | static DEFINE_MUTEX(cpufreq_fast_switch_lock); | |
474 | ||
475 | static void cpufreq_list_transition_notifiers(void) | |
476 | { | |
477 | struct notifier_block *nb; | |
478 | ||
479 | pr_info("Registered transition notifiers:\n"); | |
480 | ||
481 | mutex_lock(&cpufreq_transition_notifier_list.mutex); | |
482 | ||
483 | for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next) | |
d75f773c | 484 | pr_info("%pS\n", nb->notifier_call); |
b7898fda RW |
485 | |
486 | mutex_unlock(&cpufreq_transition_notifier_list.mutex); | |
487 | } | |
488 | ||
489 | /** | |
490 | * cpufreq_enable_fast_switch - Enable fast frequency switching for policy. | |
491 | * @policy: cpufreq policy to enable fast frequency switching for. | |
492 | * | |
493 | * Try to enable fast frequency switching for @policy. | |
494 | * | |
495 | * The attempt will fail if there is at least one transition notifier registered | |
496 | * at this point, as fast frequency switching is quite fundamentally at odds | |
497 | * with transition notifiers. Thus if successful, it will make registration of | |
498 | * transition notifiers fail going forward. | |
499 | */ | |
500 | void cpufreq_enable_fast_switch(struct cpufreq_policy *policy) | |
501 | { | |
502 | lockdep_assert_held(&policy->rwsem); | |
503 | ||
504 | if (!policy->fast_switch_possible) | |
505 | return; | |
506 | ||
507 | mutex_lock(&cpufreq_fast_switch_lock); | |
508 | if (cpufreq_fast_switch_count >= 0) { | |
509 | cpufreq_fast_switch_count++; | |
510 | policy->fast_switch_enabled = true; | |
511 | } else { | |
512 | pr_warn("CPU%u: Fast frequency switching not enabled\n", | |
513 | policy->cpu); | |
514 | cpufreq_list_transition_notifiers(); | |
515 | } | |
516 | mutex_unlock(&cpufreq_fast_switch_lock); | |
517 | } | |
518 | EXPORT_SYMBOL_GPL(cpufreq_enable_fast_switch); | |
519 | ||
6c9d9c81 RW |
520 | /** |
521 | * cpufreq_disable_fast_switch - Disable fast frequency switching for policy. | |
522 | * @policy: cpufreq policy to disable fast frequency switching for. | |
523 | */ | |
524 | void cpufreq_disable_fast_switch(struct cpufreq_policy *policy) | |
b7898fda RW |
525 | { |
526 | mutex_lock(&cpufreq_fast_switch_lock); | |
527 | if (policy->fast_switch_enabled) { | |
528 | policy->fast_switch_enabled = false; | |
529 | if (!WARN_ON(cpufreq_fast_switch_count <= 0)) | |
530 | cpufreq_fast_switch_count--; | |
531 | } | |
532 | mutex_unlock(&cpufreq_fast_switch_lock); | |
533 | } | |
6c9d9c81 | 534 | EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch); |
1da177e4 | 535 | |
f9ccdec2 VK |
536 | static unsigned int __resolve_freq(struct cpufreq_policy *policy, |
537 | unsigned int target_freq, unsigned int relation) | |
e3c06236 | 538 | { |
b3beca76 | 539 | unsigned int idx; |
abe8bd02 | 540 | |
b3beca76 | 541 | target_freq = clamp_val(target_freq, policy->min, policy->max); |
abe8bd02 | 542 | |
6ca7076f | 543 | if (!policy->freq_table) |
b3beca76 | 544 | return target_freq; |
abe8bd02 | 545 | |
b3beca76 VK |
546 | idx = cpufreq_frequency_table_target(policy, target_freq, relation); |
547 | policy->cached_resolved_idx = idx; | |
548 | policy->cached_target_freq = target_freq; | |
549 | return policy->freq_table[idx].frequency; | |
e3c06236 | 550 | } |
f9ccdec2 VK |
551 | |
552 | /** | |
553 | * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported | |
554 | * one. | |
555 | * @policy: associated policy to interrogate | |
556 | * @target_freq: target frequency to resolve. | |
557 | * | |
558 | * The target to driver frequency mapping is cached in the policy. | |
559 | * | |
560 | * Return: Lowest driver-supported frequency greater than or equal to the | |
561 | * given target_freq, subject to policy (min/max) and driver limitations. | |
562 | */ | |
563 | unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, | |
564 | unsigned int target_freq) | |
565 | { | |
b894d20e | 566 | return __resolve_freq(policy, target_freq, CPUFREQ_RELATION_LE); |
f9ccdec2 | 567 | } |
ae2c1ca6 | 568 | EXPORT_SYMBOL_GPL(cpufreq_driver_resolve_freq); |
e3c06236 | 569 | |
aa7519af VK |
570 | unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy) |
571 | { | |
572 | unsigned int latency; | |
573 | ||
574 | if (policy->transition_delay_us) | |
575 | return policy->transition_delay_us; | |
576 | ||
577 | latency = policy->cpuinfo.transition_latency / NSEC_PER_USEC; | |
e948bc8f VK |
578 | if (latency) { |
579 | /* | |
580 | * For platforms that can change the frequency very fast (< 10 | |
581 | * us), the above formula gives a decent transition delay. But | |
582 | * for platforms where transition_latency is in milliseconds, it | |
583 | * ends up giving unrealistic values. | |
584 | * | |
585 | * Cap the default transition delay to 10 ms, which seems to be | |
586 | * a reasonable amount of time after which we should reevaluate | |
587 | * the frequency. | |
588 | */ | |
589 | return min(latency * LATENCY_MULTIPLIER, (unsigned int)10000); | |
590 | } | |
aa7519af VK |
591 | |
592 | return LATENCY_MULTIPLIER; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us); | |
595 | ||
1da177e4 LT |
596 | /********************************************************************* |
597 | * SYSFS INTERFACE * | |
598 | *********************************************************************/ | |
8a5c74a1 | 599 | static ssize_t show_boost(struct kobject *kobj, |
625c85a6 | 600 | struct kobj_attribute *attr, char *buf) |
6f19efc0 LM |
601 | { |
602 | return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); | |
603 | } | |
604 | ||
625c85a6 VK |
605 | static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr, |
606 | const char *buf, size_t count) | |
6f19efc0 LM |
607 | { |
608 | int ret, enable; | |
609 | ||
610 | ret = sscanf(buf, "%d", &enable); | |
611 | if (ret != 1 || enable < 0 || enable > 1) | |
612 | return -EINVAL; | |
613 | ||
614 | if (cpufreq_boost_trigger_state(enable)) { | |
e837f9b5 JP |
615 | pr_err("%s: Cannot %s BOOST!\n", |
616 | __func__, enable ? "enable" : "disable"); | |
6f19efc0 LM |
617 | return -EINVAL; |
618 | } | |
619 | ||
e837f9b5 JP |
620 | pr_debug("%s: cpufreq BOOST %s\n", |
621 | __func__, enable ? "enabled" : "disabled"); | |
6f19efc0 LM |
622 | |
623 | return count; | |
624 | } | |
625 | define_one_global_rw(boost); | |
1da177e4 | 626 | |
218a06a7 JZ |
627 | static ssize_t show_local_boost(struct cpufreq_policy *policy, char *buf) |
628 | { | |
629 | return sysfs_emit(buf, "%d\n", policy->boost_enabled); | |
630 | } | |
631 | ||
632 | static ssize_t store_local_boost(struct cpufreq_policy *policy, | |
633 | const char *buf, size_t count) | |
634 | { | |
635 | int ret, enable; | |
636 | ||
637 | ret = kstrtoint(buf, 10, &enable); | |
638 | if (ret || enable < 0 || enable > 1) | |
639 | return -EINVAL; | |
640 | ||
641 | if (!cpufreq_driver->boost_enabled) | |
642 | return -EINVAL; | |
643 | ||
644 | if (policy->boost_enabled == enable) | |
645 | return count; | |
646 | ||
647 | cpus_read_lock(); | |
648 | ret = cpufreq_driver->set_boost(policy, enable); | |
649 | cpus_read_unlock(); | |
650 | ||
651 | if (ret) | |
652 | return ret; | |
653 | ||
654 | policy->boost_enabled = enable; | |
655 | ||
656 | return count; | |
657 | } | |
658 | ||
659 | static struct freq_attr local_boost = __ATTR(boost, 0644, show_local_boost, store_local_boost); | |
660 | ||
42f91fa1 | 661 | static struct cpufreq_governor *find_governor(const char *str_governor) |
3bcb09a3 JF |
662 | { |
663 | struct cpufreq_governor *t; | |
664 | ||
f7b27061 | 665 | for_each_governor(t) |
7c4f4539 | 666 | if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
3bcb09a3 JF |
667 | return t; |
668 | ||
669 | return NULL; | |
670 | } | |
671 | ||
8cc46ae5 VK |
672 | static struct cpufreq_governor *get_governor(const char *str_governor) |
673 | { | |
674 | struct cpufreq_governor *t; | |
675 | ||
676 | mutex_lock(&cpufreq_governor_mutex); | |
677 | t = find_governor(str_governor); | |
678 | if (!t) | |
679 | goto unlock; | |
680 | ||
681 | if (!try_module_get(t->owner)) | |
682 | t = NULL; | |
683 | ||
684 | unlock: | |
685 | mutex_unlock(&cpufreq_governor_mutex); | |
686 | ||
687 | return t; | |
688 | } | |
689 | ||
1e4f63ae | 690 | static unsigned int cpufreq_parse_policy(char *str_governor) |
ab05d97a | 691 | { |
1e4f63ae RW |
692 | if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) |
693 | return CPUFREQ_POLICY_PERFORMANCE; | |
694 | ||
695 | if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) | |
696 | return CPUFREQ_POLICY_POWERSAVE; | |
697 | ||
698 | return CPUFREQ_POLICY_UNKNOWN; | |
ab05d97a YH |
699 | } |
700 | ||
1da177e4 | 701 | /** |
5ddc6d4e | 702 | * cpufreq_parse_governor - parse a governor string only for has_target() |
1e4f63ae | 703 | * @str_governor: Governor name. |
1da177e4 | 704 | */ |
1e4f63ae | 705 | static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor) |
1da177e4 | 706 | { |
ab05d97a | 707 | struct cpufreq_governor *t; |
045149e6 | 708 | |
8cc46ae5 VK |
709 | t = get_governor(str_governor); |
710 | if (t) | |
711 | return t; | |
ea714970 | 712 | |
8cc46ae5 VK |
713 | if (request_module("cpufreq_%s", str_governor)) |
714 | return NULL; | |
045149e6 | 715 | |
8cc46ae5 | 716 | return get_governor(str_governor); |
1da177e4 | 717 | } |
1da177e4 | 718 | |
a9909c21 | 719 | /* |
e08f5f5b GS |
720 | * cpufreq_per_cpu_attr_read() / show_##file_name() - |
721 | * print out cpufreq information | |
1da177e4 LT |
722 | * |
723 | * Write out information from cpufreq_driver->policy[cpu]; object must be | |
724 | * "unsigned int". | |
725 | */ | |
726 | ||
32ee8c3e DJ |
727 | #define show_one(file_name, object) \ |
728 | static ssize_t show_##file_name \ | |
905d77cd | 729 | (struct cpufreq_policy *policy, char *buf) \ |
32ee8c3e | 730 | { \ |
29464f28 | 731 | return sprintf(buf, "%u\n", policy->object); \ |
1da177e4 LT |
732 | } |
733 | ||
734 | show_one(cpuinfo_min_freq, cpuinfo.min_freq); | |
735 | show_one(cpuinfo_max_freq, cpuinfo.max_freq); | |
ed129784 | 736 | show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
1da177e4 LT |
737 | show_one(scaling_min_freq, min); |
738 | show_one(scaling_max_freq, max); | |
c034b02e | 739 | |
f8475cef LB |
740 | __weak unsigned int arch_freq_get_on_cpu(int cpu) |
741 | { | |
742 | return 0; | |
743 | } | |
744 | ||
09347b29 | 745 | static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
c034b02e DB |
746 | { |
747 | ssize_t ret; | |
f8475cef | 748 | unsigned int freq; |
c034b02e | 749 | |
f8475cef LB |
750 | freq = arch_freq_get_on_cpu(policy->cpu); |
751 | if (freq) | |
752 | ret = sprintf(buf, "%u\n", freq); | |
681fe684 | 753 | else if (cpufreq_driver->setpolicy && cpufreq_driver->get) |
c034b02e DB |
754 | ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); |
755 | else | |
756 | ret = sprintf(buf, "%u\n", policy->cur); | |
757 | return ret; | |
758 | } | |
1da177e4 | 759 | |
a9909c21 | 760 | /* |
1da177e4 LT |
761 | * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access |
762 | */ | |
763 | #define store_one(file_name, object) \ | |
764 | static ssize_t store_##file_name \ | |
905d77cd | 765 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ |
1da177e4 | 766 | { \ |
18c49926 VK |
767 | unsigned long val; \ |
768 | int ret; \ | |
1da177e4 | 769 | \ |
877d5cd2 | 770 | ret = kstrtoul(buf, 0, &val); \ |
771 | if (ret) \ | |
772 | return ret; \ | |
1da177e4 | 773 | \ |
3000ce3c | 774 | ret = freq_qos_update_request(policy->object##_freq_req, val);\ |
18c49926 | 775 | return ret >= 0 ? count : ret; \ |
1da177e4 LT |
776 | } |
777 | ||
29464f28 DJ |
778 | store_one(scaling_min_freq, min); |
779 | store_one(scaling_max_freq, max); | |
1da177e4 | 780 | |
a9909c21 | 781 | /* |
1da177e4 LT |
782 | * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware |
783 | */ | |
905d77cd DJ |
784 | static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
785 | char *buf) | |
1da177e4 | 786 | { |
d92d50a4 | 787 | unsigned int cur_freq = __cpufreq_get(policy); |
9b4f603e RW |
788 | |
789 | if (cur_freq) | |
790 | return sprintf(buf, "%u\n", cur_freq); | |
791 | ||
792 | return sprintf(buf, "<unknown>\n"); | |
1da177e4 LT |
793 | } |
794 | ||
a9909c21 | 795 | /* |
1da177e4 LT |
796 | * show_scaling_governor - show the current policy for the specified CPU |
797 | */ | |
905d77cd | 798 | static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 799 | { |
29464f28 | 800 | if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
1da177e4 LT |
801 | return sprintf(buf, "powersave\n"); |
802 | else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) | |
803 | return sprintf(buf, "performance\n"); | |
804 | else if (policy->governor) | |
4b972f0b | 805 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
29464f28 | 806 | policy->governor->name); |
1da177e4 LT |
807 | return -EINVAL; |
808 | } | |
809 | ||
a9909c21 | 810 | /* |
1da177e4 LT |
811 | * store_scaling_governor - store policy for the specified CPU |
812 | */ | |
905d77cd DJ |
813 | static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
814 | const char *buf, size_t count) | |
1da177e4 | 815 | { |
1e4f63ae | 816 | char str_governor[16]; |
5136fa56 | 817 | int ret; |
1da177e4 | 818 | |
29464f28 | 819 | ret = sscanf(buf, "%15s", str_governor); |
1da177e4 LT |
820 | if (ret != 1) |
821 | return -EINVAL; | |
822 | ||
ab05d97a | 823 | if (cpufreq_driver->setpolicy) { |
1e4f63ae RW |
824 | unsigned int new_pol; |
825 | ||
826 | new_pol = cpufreq_parse_policy(str_governor); | |
827 | if (!new_pol) | |
ab05d97a | 828 | return -EINVAL; |
1e4f63ae RW |
829 | |
830 | ret = cpufreq_set_policy(policy, NULL, new_pol); | |
ab05d97a | 831 | } else { |
1e4f63ae RW |
832 | struct cpufreq_governor *new_gov; |
833 | ||
834 | new_gov = cpufreq_parse_governor(str_governor); | |
835 | if (!new_gov) | |
ab05d97a | 836 | return -EINVAL; |
1da177e4 | 837 | |
1e4f63ae RW |
838 | ret = cpufreq_set_policy(policy, new_gov, |
839 | CPUFREQ_POLICY_UNKNOWN); | |
a8b149d3 | 840 | |
1e4f63ae RW |
841 | module_put(new_gov->owner); |
842 | } | |
a8b149d3 | 843 | |
88dc4384 | 844 | return ret ? ret : count; |
1da177e4 LT |
845 | } |
846 | ||
a9909c21 | 847 | /* |
1da177e4 LT |
848 | * show_scaling_driver - show the cpufreq driver currently loaded |
849 | */ | |
905d77cd | 850 | static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 851 | { |
1c3d85dd | 852 | return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
1da177e4 LT |
853 | } |
854 | ||
a9909c21 | 855 | /* |
1da177e4 LT |
856 | * show_scaling_available_governors - show the available CPUfreq governors |
857 | */ | |
905d77cd DJ |
858 | static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
859 | char *buf) | |
1da177e4 LT |
860 | { |
861 | ssize_t i = 0; | |
862 | struct cpufreq_governor *t; | |
863 | ||
9c0ebcf7 | 864 | if (!has_target()) { |
1da177e4 LT |
865 | i += sprintf(buf, "performance powersave"); |
866 | goto out; | |
867 | } | |
868 | ||
8cc46ae5 | 869 | mutex_lock(&cpufreq_governor_mutex); |
f7b27061 | 870 | for_each_governor(t) { |
29464f28 DJ |
871 | if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
872 | - (CPUFREQ_NAME_LEN + 2))) | |
8cc46ae5 | 873 | break; |
4b972f0b | 874 | i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
1da177e4 | 875 | } |
8cc46ae5 | 876 | mutex_unlock(&cpufreq_governor_mutex); |
7d5e350f | 877 | out: |
1da177e4 LT |
878 | i += sprintf(&buf[i], "\n"); |
879 | return i; | |
880 | } | |
e8628dd0 | 881 | |
f4fd3797 | 882 | ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
1da177e4 LT |
883 | { |
884 | ssize_t i = 0; | |
885 | unsigned int cpu; | |
886 | ||
835481d9 | 887 | for_each_cpu(cpu, mask) { |
336e5128 | 888 | i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u ", cpu); |
1da177e4 | 889 | if (i >= (PAGE_SIZE - 5)) |
29464f28 | 890 | break; |
1da177e4 | 891 | } |
336e5128 VK |
892 | |
893 | /* Remove the extra space at the end */ | |
894 | i--; | |
895 | ||
1da177e4 LT |
896 | i += sprintf(&buf[i], "\n"); |
897 | return i; | |
898 | } | |
f4fd3797 | 899 | EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
1da177e4 | 900 | |
a9909c21 | 901 | /* |
e8628dd0 DW |
902 | * show_related_cpus - show the CPUs affected by each transition even if |
903 | * hw coordination is in use | |
904 | */ | |
905 | static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) | |
906 | { | |
f4fd3797 | 907 | return cpufreq_show_cpus(policy->related_cpus, buf); |
e8628dd0 DW |
908 | } |
909 | ||
a9909c21 | 910 | /* |
e8628dd0 DW |
911 | * show_affected_cpus - show the CPUs affected by each transition |
912 | */ | |
913 | static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) | |
914 | { | |
f4fd3797 | 915 | return cpufreq_show_cpus(policy->cpus, buf); |
e8628dd0 DW |
916 | } |
917 | ||
9e76988e | 918 | static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
905d77cd | 919 | const char *buf, size_t count) |
9e76988e VP |
920 | { |
921 | unsigned int freq = 0; | |
922 | unsigned int ret; | |
923 | ||
879000f9 | 924 | if (!policy->governor || !policy->governor->store_setspeed) |
9e76988e VP |
925 | return -EINVAL; |
926 | ||
927 | ret = sscanf(buf, "%u", &freq); | |
928 | if (ret != 1) | |
929 | return -EINVAL; | |
930 | ||
931 | policy->governor->store_setspeed(policy, freq); | |
932 | ||
933 | return count; | |
934 | } | |
935 | ||
936 | static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) | |
937 | { | |
879000f9 | 938 | if (!policy->governor || !policy->governor->show_setspeed) |
9e76988e VP |
939 | return sprintf(buf, "<unsupported>\n"); |
940 | ||
941 | return policy->governor->show_setspeed(policy, buf); | |
942 | } | |
1da177e4 | 943 | |
a9909c21 | 944 | /* |
8bf1ac72 | 945 | * show_bios_limit - show the current cpufreq HW/BIOS limitation |
e2f74f35 TR |
946 | */ |
947 | static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) | |
948 | { | |
949 | unsigned int limit; | |
950 | int ret; | |
b23aa311 YH |
951 | ret = cpufreq_driver->bios_limit(policy->cpu, &limit); |
952 | if (!ret) | |
953 | return sprintf(buf, "%u\n", limit); | |
e2f74f35 TR |
954 | return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); |
955 | } | |
956 | ||
6dad2a29 BP |
957 | cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
958 | cpufreq_freq_attr_ro(cpuinfo_min_freq); | |
959 | cpufreq_freq_attr_ro(cpuinfo_max_freq); | |
960 | cpufreq_freq_attr_ro(cpuinfo_transition_latency); | |
961 | cpufreq_freq_attr_ro(scaling_available_governors); | |
962 | cpufreq_freq_attr_ro(scaling_driver); | |
963 | cpufreq_freq_attr_ro(scaling_cur_freq); | |
964 | cpufreq_freq_attr_ro(bios_limit); | |
965 | cpufreq_freq_attr_ro(related_cpus); | |
966 | cpufreq_freq_attr_ro(affected_cpus); | |
967 | cpufreq_freq_attr_rw(scaling_min_freq); | |
968 | cpufreq_freq_attr_rw(scaling_max_freq); | |
969 | cpufreq_freq_attr_rw(scaling_governor); | |
970 | cpufreq_freq_attr_rw(scaling_setspeed); | |
1da177e4 | 971 | |
fe262d5c | 972 | static struct attribute *cpufreq_attrs[] = { |
1da177e4 LT |
973 | &cpuinfo_min_freq.attr, |
974 | &cpuinfo_max_freq.attr, | |
ed129784 | 975 | &cpuinfo_transition_latency.attr, |
1da177e4 LT |
976 | &scaling_min_freq.attr, |
977 | &scaling_max_freq.attr, | |
978 | &affected_cpus.attr, | |
e8628dd0 | 979 | &related_cpus.attr, |
1da177e4 LT |
980 | &scaling_governor.attr, |
981 | &scaling_driver.attr, | |
982 | &scaling_available_governors.attr, | |
9e76988e | 983 | &scaling_setspeed.attr, |
1da177e4 LT |
984 | NULL |
985 | }; | |
fe262d5c | 986 | ATTRIBUTE_GROUPS(cpufreq); |
1da177e4 | 987 | |
29464f28 DJ |
988 | #define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
989 | #define to_attr(a) container_of(a, struct freq_attr, attr) | |
1da177e4 | 990 | |
29464f28 | 991 | static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
1da177e4 | 992 | { |
905d77cd DJ |
993 | struct cpufreq_policy *policy = to_policy(kobj); |
994 | struct freq_attr *fattr = to_attr(attr); | |
d4627a28 | 995 | ssize_t ret = -EBUSY; |
6eed9404 | 996 | |
e6e8df07 KS |
997 | if (!fattr->show) |
998 | return -EIO; | |
999 | ||
ad7722da | 1000 | down_read(&policy->rwsem); |
d4627a28 SS |
1001 | if (likely(!policy_is_inactive(policy))) |
1002 | ret = fattr->show(policy, buf); | |
ad7722da | 1003 | up_read(&policy->rwsem); |
1b750e3b | 1004 | |
1da177e4 LT |
1005 | return ret; |
1006 | } | |
1007 | ||
905d77cd DJ |
1008 | static ssize_t store(struct kobject *kobj, struct attribute *attr, |
1009 | const char *buf, size_t count) | |
1da177e4 | 1010 | { |
905d77cd DJ |
1011 | struct cpufreq_policy *policy = to_policy(kobj); |
1012 | struct freq_attr *fattr = to_attr(attr); | |
d4627a28 | 1013 | ssize_t ret = -EBUSY; |
6eed9404 | 1014 | |
e6e8df07 KS |
1015 | if (!fattr->store) |
1016 | return -EIO; | |
1017 | ||
9ab9b9d3 VK |
1018 | down_write(&policy->rwsem); |
1019 | if (likely(!policy_is_inactive(policy))) | |
1020 | ret = fattr->store(policy, buf, count); | |
1021 | up_write(&policy->rwsem); | |
4f750c93 | 1022 | |
1da177e4 LT |
1023 | return ret; |
1024 | } | |
1025 | ||
905d77cd | 1026 | static void cpufreq_sysfs_release(struct kobject *kobj) |
1da177e4 | 1027 | { |
905d77cd | 1028 | struct cpufreq_policy *policy = to_policy(kobj); |
2d06d8c4 | 1029 | pr_debug("last reference is dropped\n"); |
1da177e4 LT |
1030 | complete(&policy->kobj_unregister); |
1031 | } | |
1032 | ||
52cf25d0 | 1033 | static const struct sysfs_ops sysfs_ops = { |
1da177e4 LT |
1034 | .show = show, |
1035 | .store = store, | |
1036 | }; | |
1037 | ||
108fcad9 | 1038 | static const struct kobj_type ktype_cpufreq = { |
1da177e4 | 1039 | .sysfs_ops = &sysfs_ops, |
fe262d5c | 1040 | .default_groups = cpufreq_groups, |
1da177e4 LT |
1041 | .release = cpufreq_sysfs_release, |
1042 | }; | |
1043 | ||
2c1b5a84 XW |
1044 | static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu, |
1045 | struct device *dev) | |
87549141 | 1046 | { |
67d874c3 | 1047 | if (unlikely(!dev)) |
2f0ba790 RW |
1048 | return; |
1049 | ||
1050 | if (cpumask_test_and_set_cpu(cpu, policy->real_cpus)) | |
1051 | return; | |
1052 | ||
26619804 | 1053 | dev_dbg(dev, "%s: Adding symlink\n", __func__); |
2f0ba790 RW |
1054 | if (sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq")) |
1055 | dev_err(dev, "cpufreq symlink creation failed\n"); | |
87549141 VK |
1056 | } |
1057 | ||
5c84c1b8 | 1058 | static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu, |
26619804 | 1059 | struct device *dev) |
87549141 | 1060 | { |
26619804 VK |
1061 | dev_dbg(dev, "%s: Removing symlink\n", __func__); |
1062 | sysfs_remove_link(&dev->kobj, "cpufreq"); | |
5c84c1b8 | 1063 | cpumask_clear_cpu(cpu, policy->real_cpus); |
87549141 VK |
1064 | } |
1065 | ||
d9612a49 | 1066 | static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) |
909a694e DJ |
1067 | { |
1068 | struct freq_attr **drv_attr; | |
909a694e | 1069 | int ret = 0; |
909a694e | 1070 | |
909a694e | 1071 | /* set up files for this cpu device */ |
1c3d85dd | 1072 | drv_attr = cpufreq_driver->attr; |
f13f1184 | 1073 | while (drv_attr && *drv_attr) { |
909a694e DJ |
1074 | ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
1075 | if (ret) | |
6d4e81ed | 1076 | return ret; |
909a694e DJ |
1077 | drv_attr++; |
1078 | } | |
1c3d85dd | 1079 | if (cpufreq_driver->get) { |
909a694e DJ |
1080 | ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
1081 | if (ret) | |
6d4e81ed | 1082 | return ret; |
909a694e | 1083 | } |
c034b02e DB |
1084 | |
1085 | ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); | |
1086 | if (ret) | |
6d4e81ed | 1087 | return ret; |
c034b02e | 1088 | |
1c3d85dd | 1089 | if (cpufreq_driver->bios_limit) { |
e2f74f35 TR |
1090 | ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
1091 | if (ret) | |
6d4e81ed | 1092 | return ret; |
e2f74f35 | 1093 | } |
909a694e | 1094 | |
218a06a7 JZ |
1095 | if (cpufreq_boost_supported()) { |
1096 | ret = sysfs_create_file(&policy->kobj, &local_boost.attr); | |
1097 | if (ret) | |
1098 | return ret; | |
1099 | } | |
1100 | ||
26619804 | 1101 | return 0; |
e18f1682 SB |
1102 | } |
1103 | ||
7f0fa40f | 1104 | static int cpufreq_init_policy(struct cpufreq_policy *policy) |
e18f1682 | 1105 | { |
1e4f63ae RW |
1106 | struct cpufreq_governor *gov = NULL; |
1107 | unsigned int pol = CPUFREQ_POLICY_UNKNOWN; | |
8cc46ae5 | 1108 | int ret; |
ab05d97a YH |
1109 | |
1110 | if (has_target()) { | |
1e4f63ae | 1111 | /* Update policy governor to the one used before hotplug. */ |
8cc46ae5 | 1112 | gov = get_governor(policy->last_governor); |
ab05d97a YH |
1113 | if (gov) { |
1114 | pr_debug("Restoring governor %s for cpu %d\n", | |
8412b456 | 1115 | gov->name, policy->cpu); |
1e4f63ae | 1116 | } else { |
8412b456 QP |
1117 | gov = get_governor(default_governor); |
1118 | } | |
1119 | ||
1120 | if (!gov) { | |
1121 | gov = cpufreq_default_governor(); | |
8412b456 | 1122 | __module_get(gov->owner); |
ab05d97a | 1123 | } |
8412b456 | 1124 | |
de1df26b | 1125 | } else { |
8412b456 | 1126 | |
ab05d97a YH |
1127 | /* Use the default policy if there is no last_policy. */ |
1128 | if (policy->last_policy) { | |
1e4f63ae | 1129 | pol = policy->last_policy; |
8412b456 QP |
1130 | } else { |
1131 | pol = cpufreq_parse_policy(default_governor); | |
f5739cb0 | 1132 | /* |
8412b456 | 1133 | * In case the default governor is neither "performance" |
f5739cb0 RW |
1134 | * nor "powersave", fall back to the initial policy |
1135 | * value set by the driver. | |
1136 | */ | |
1137 | if (pol == CPUFREQ_POLICY_UNKNOWN) | |
1138 | pol = policy->policy; | |
ab05d97a | 1139 | } |
f5739cb0 RW |
1140 | if (pol != CPUFREQ_POLICY_PERFORMANCE && |
1141 | pol != CPUFREQ_POLICY_POWERSAVE) | |
1142 | return -ENODATA; | |
69030dd1 | 1143 | } |
ab05d97a | 1144 | |
8cc46ae5 VK |
1145 | ret = cpufreq_set_policy(policy, gov, pol); |
1146 | if (gov) | |
1147 | module_put(gov->owner); | |
1148 | ||
1149 | return ret; | |
909a694e DJ |
1150 | } |
1151 | ||
d9612a49 | 1152 | static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) |
fcf80582 | 1153 | { |
9c0ebcf7 | 1154 | int ret = 0; |
fcf80582 | 1155 | |
bb29ae15 VK |
1156 | /* Has this CPU been taken care of already? */ |
1157 | if (cpumask_test_cpu(cpu, policy->cpus)) | |
1158 | return 0; | |
1159 | ||
49f18560 | 1160 | down_write(&policy->rwsem); |
45482c70 RW |
1161 | if (has_target()) |
1162 | cpufreq_stop_governor(policy); | |
fcf80582 | 1163 | |
fcf80582 | 1164 | cpumask_set_cpu(cpu, policy->cpus); |
2eaa3e2d | 1165 | |
9c0ebcf7 | 1166 | if (has_target()) { |
0a300767 | 1167 | ret = cpufreq_start_governor(policy); |
49f18560 | 1168 | if (ret) |
3de9bdeb | 1169 | pr_err("%s: Failed to start governor\n", __func__); |
820c6ca2 | 1170 | } |
49f18560 VK |
1171 | up_write(&policy->rwsem); |
1172 | return ret; | |
fcf80582 | 1173 | } |
1da177e4 | 1174 | |
c57b25bd | 1175 | void refresh_frequency_limits(struct cpufreq_policy *policy) |
70a59fde | 1176 | { |
67d874c3 | 1177 | if (!policy_is_inactive(policy)) { |
67d874c3 | 1178 | pr_debug("updating policy for CPU %u\n", policy->cpu); |
70a59fde | 1179 | |
1e4f63ae | 1180 | cpufreq_set_policy(policy, policy->governor, policy->policy); |
67d874c3 | 1181 | } |
70a59fde | 1182 | } |
c57b25bd | 1183 | EXPORT_SYMBOL(refresh_frequency_limits); |
70a59fde | 1184 | |
11eb69b9 VK |
1185 | static void handle_update(struct work_struct *work) |
1186 | { | |
1187 | struct cpufreq_policy *policy = | |
1188 | container_of(work, struct cpufreq_policy, update); | |
70a59fde VK |
1189 | |
1190 | pr_debug("handle_update for cpu %u called\n", policy->cpu); | |
67d874c3 | 1191 | down_write(&policy->rwsem); |
70a59fde | 1192 | refresh_frequency_limits(policy); |
67d874c3 VK |
1193 | up_write(&policy->rwsem); |
1194 | } | |
1195 | ||
1196 | static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq, | |
1197 | void *data) | |
1198 | { | |
1199 | struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_min); | |
1200 | ||
1201 | schedule_work(&policy->update); | |
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq, | |
1206 | void *data) | |
1207 | { | |
1208 | struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_max); | |
1209 | ||
1210 | schedule_work(&policy->update); | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) | |
1215 | { | |
1216 | struct kobject *kobj; | |
1217 | struct completion *cmp; | |
1218 | ||
1219 | down_write(&policy->rwsem); | |
1220 | cpufreq_stats_free_table(policy); | |
1221 | kobj = &policy->kobj; | |
1222 | cmp = &policy->kobj_unregister; | |
1223 | up_write(&policy->rwsem); | |
1224 | kobject_put(kobj); | |
1225 | ||
1226 | /* | |
1227 | * We need to make sure that the underlying kobj is | |
1228 | * actually not referenced anymore by anybody before we | |
1229 | * proceed with unloading. | |
1230 | */ | |
1231 | pr_debug("waiting for dropping of refcount\n"); | |
1232 | wait_for_completion(cmp); | |
1233 | pr_debug("wait complete\n"); | |
fcf80582 | 1234 | } |
1da177e4 | 1235 | |
a34e63b1 | 1236 | static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) |
e9698cc5 SB |
1237 | { |
1238 | struct cpufreq_policy *policy; | |
67d874c3 | 1239 | struct device *dev = get_cpu_device(cpu); |
edd4a893 | 1240 | int ret; |
e9698cc5 | 1241 | |
67d874c3 VK |
1242 | if (!dev) |
1243 | return NULL; | |
1244 | ||
e9698cc5 SB |
1245 | policy = kzalloc(sizeof(*policy), GFP_KERNEL); |
1246 | if (!policy) | |
1247 | return NULL; | |
1248 | ||
1249 | if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) | |
1250 | goto err_free_policy; | |
1251 | ||
1252 | if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) | |
1253 | goto err_free_cpumask; | |
1254 | ||
559ed407 RW |
1255 | if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) |
1256 | goto err_free_rcpumask; | |
1257 | ||
5c510548 | 1258 | init_completion(&policy->kobj_unregister); |
edd4a893 VK |
1259 | ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, |
1260 | cpufreq_global_kobject, "policy%u", cpu); | |
1261 | if (ret) { | |
67d874c3 | 1262 | dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret); |
2acb9bda RW |
1263 | /* |
1264 | * The entire policy object will be freed below, but the extra | |
1265 | * memory allocated for the kobject name needs to be freed by | |
1266 | * releasing the kobject. | |
1267 | */ | |
4ebe36c9 | 1268 | kobject_put(&policy->kobj); |
edd4a893 VK |
1269 | goto err_free_real_cpus; |
1270 | } | |
1271 | ||
3000ce3c RW |
1272 | freq_constraints_init(&policy->constraints); |
1273 | ||
67d874c3 VK |
1274 | policy->nb_min.notifier_call = cpufreq_notifier_min; |
1275 | policy->nb_max.notifier_call = cpufreq_notifier_max; | |
1276 | ||
3000ce3c RW |
1277 | ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN, |
1278 | &policy->nb_min); | |
67d874c3 | 1279 | if (ret) { |
ba6ea77d LC |
1280 | dev_err(dev, "Failed to register MIN QoS notifier: %d (CPU%u)\n", |
1281 | ret, cpu); | |
67d874c3 VK |
1282 | goto err_kobj_remove; |
1283 | } | |
1284 | ||
3000ce3c RW |
1285 | ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX, |
1286 | &policy->nb_max); | |
67d874c3 | 1287 | if (ret) { |
ba6ea77d LC |
1288 | dev_err(dev, "Failed to register MAX QoS notifier: %d (CPU%u)\n", |
1289 | ret, cpu); | |
67d874c3 VK |
1290 | goto err_min_qos_notifier; |
1291 | } | |
1292 | ||
c88a1f8b | 1293 | INIT_LIST_HEAD(&policy->policy_list); |
ad7722da | 1294 | init_rwsem(&policy->rwsem); |
12478cf0 SB |
1295 | spin_lock_init(&policy->transition_lock); |
1296 | init_waitqueue_head(&policy->transition_wait); | |
818c5712 | 1297 | INIT_WORK(&policy->update, handle_update); |
ad7722da | 1298 | |
a34e63b1 | 1299 | policy->cpu = cpu; |
e9698cc5 SB |
1300 | return policy; |
1301 | ||
67d874c3 | 1302 | err_min_qos_notifier: |
3000ce3c RW |
1303 | freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, |
1304 | &policy->nb_min); | |
67d874c3 VK |
1305 | err_kobj_remove: |
1306 | cpufreq_policy_put_kobj(policy); | |
edd4a893 VK |
1307 | err_free_real_cpus: |
1308 | free_cpumask_var(policy->real_cpus); | |
2fc3384d VK |
1309 | err_free_rcpumask: |
1310 | free_cpumask_var(policy->related_cpus); | |
e9698cc5 SB |
1311 | err_free_cpumask: |
1312 | free_cpumask_var(policy->cpus); | |
1313 | err_free_policy: | |
1314 | kfree(policy); | |
1315 | ||
1316 | return NULL; | |
1317 | } | |
1318 | ||
f9f41e3e | 1319 | static void cpufreq_policy_free(struct cpufreq_policy *policy) |
e9698cc5 | 1320 | { |
988bed09 VK |
1321 | unsigned long flags; |
1322 | int cpu; | |
1323 | ||
a2f6a7ac VK |
1324 | /* |
1325 | * The callers must ensure the policy is inactive by now, to avoid any | |
1326 | * races with show()/store() callbacks. | |
1327 | */ | |
1328 | if (unlikely(!policy_is_inactive(policy))) | |
1329 | pr_warn("%s: Freeing active policy\n", __func__); | |
1330 | ||
988bed09 VK |
1331 | /* Remove policy from list */ |
1332 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
1333 | list_del(&policy->policy_list); | |
1334 | ||
1335 | for_each_cpu(cpu, policy->related_cpus) | |
1336 | per_cpu(cpufreq_cpu_data, cpu) = NULL; | |
1337 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1338 | ||
3000ce3c RW |
1339 | freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX, |
1340 | &policy->nb_max); | |
1341 | freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, | |
1342 | &policy->nb_min); | |
6a149036 | 1343 | |
6941051d SH |
1344 | /* Cancel any pending policy->update work before freeing the policy. */ |
1345 | cancel_work_sync(&policy->update); | |
6a149036 VK |
1346 | |
1347 | if (policy->max_freq_req) { | |
1348 | /* | |
1e81d3e0 TY |
1349 | * Remove max_freq_req after sending CPUFREQ_REMOVE_POLICY |
1350 | * notification, since CPUFREQ_CREATE_POLICY notification was | |
1351 | * sent after adding max_freq_req earlier. | |
6a149036 VK |
1352 | */ |
1353 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, | |
1354 | CPUFREQ_REMOVE_POLICY, policy); | |
3000ce3c | 1355 | freq_qos_remove_request(policy->max_freq_req); |
6a149036 VK |
1356 | } |
1357 | ||
3000ce3c | 1358 | freq_qos_remove_request(policy->min_freq_req); |
18c49926 | 1359 | kfree(policy->min_freq_req); |
67d874c3 | 1360 | |
f9f41e3e | 1361 | cpufreq_policy_put_kobj(policy); |
559ed407 | 1362 | free_cpumask_var(policy->real_cpus); |
e9698cc5 SB |
1363 | free_cpumask_var(policy->related_cpus); |
1364 | free_cpumask_var(policy->cpus); | |
1365 | kfree(policy); | |
1366 | } | |
1367 | ||
0b275352 | 1368 | static int cpufreq_online(unsigned int cpu) |
1da177e4 | 1369 | { |
7f0c020a | 1370 | struct cpufreq_policy *policy; |
194d99c7 | 1371 | bool new_policy; |
1da177e4 | 1372 | unsigned long flags; |
0b275352 RW |
1373 | unsigned int j; |
1374 | int ret; | |
87549141 | 1375 | |
0b275352 | 1376 | pr_debug("%s: bringing CPU%u online\n", __func__, cpu); |
6eed9404 | 1377 | |
bb29ae15 | 1378 | /* Check if this CPU already has a policy to manage it */ |
9104bb26 | 1379 | policy = per_cpu(cpufreq_cpu_data, cpu); |
11ce707e | 1380 | if (policy) { |
9104bb26 | 1381 | WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); |
11ce707e | 1382 | if (!policy_is_inactive(policy)) |
d9612a49 | 1383 | return cpufreq_add_policy_cpu(policy, cpu); |
1da177e4 | 1384 | |
11ce707e | 1385 | /* This is the only online CPU for the policy. Start over. */ |
194d99c7 | 1386 | new_policy = false; |
11ce707e RW |
1387 | down_write(&policy->rwsem); |
1388 | policy->cpu = cpu; | |
1389 | policy->governor = NULL; | |
11ce707e | 1390 | } else { |
194d99c7 | 1391 | new_policy = true; |
a34e63b1 | 1392 | policy = cpufreq_policy_alloc(cpu); |
72368d12 | 1393 | if (!policy) |
d4d854d6 | 1394 | return -ENOMEM; |
514ff1bc | 1395 | down_write(&policy->rwsem); |
72368d12 | 1396 | } |
0d66b91e | 1397 | |
91a12e91 | 1398 | if (!new_policy && cpufreq_driver->online) { |
68315f1a PG |
1399 | /* Recover policy->cpus using related_cpus */ |
1400 | cpumask_copy(policy->cpus, policy->related_cpus); | |
1401 | ||
91a12e91 VK |
1402 | ret = cpufreq_driver->online(policy); |
1403 | if (ret) { | |
1404 | pr_debug("%s: %d: initialization failed\n", __func__, | |
1405 | __LINE__); | |
1406 | goto out_exit_policy; | |
1407 | } | |
91a12e91 VK |
1408 | } else { |
1409 | cpumask_copy(policy->cpus, cpumask_of(cpu)); | |
643ae6e8 | 1410 | |
91a12e91 VK |
1411 | /* |
1412 | * Call driver. From then on the cpufreq must be able | |
1413 | * to accept all calls to ->verify and ->setpolicy for this CPU. | |
1414 | */ | |
1415 | ret = cpufreq_driver->init(policy); | |
1416 | if (ret) { | |
1417 | pr_debug("%s: %d: initialization failed\n", __func__, | |
1418 | __LINE__); | |
1419 | goto out_free_policy; | |
1420 | } | |
d417e069 | 1421 | |
3b718057 RW |
1422 | /* |
1423 | * The initialization has succeeded and the policy is online. | |
1424 | * If there is a problem with its frequency table, take it | |
1425 | * offline and drop it. | |
1426 | */ | |
91a12e91 VK |
1427 | ret = cpufreq_table_validate_and_sort(policy); |
1428 | if (ret) | |
3b718057 | 1429 | goto out_offline_policy; |
6d4e81ed | 1430 | |
4d1f3a5b | 1431 | /* related_cpus should at least include policy->cpus. */ |
0998a03a | 1432 | cpumask_copy(policy->related_cpus, policy->cpus); |
4d1f3a5b | 1433 | } |
559ed407 | 1434 | |
5a7e56a5 VK |
1435 | /* |
1436 | * affected cpus must always be the one, which are online. We aren't | |
1437 | * managing offline cpus here. | |
1438 | */ | |
1439 | cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); | |
1440 | ||
194d99c7 | 1441 | if (new_policy) { |
2f0ba790 | 1442 | for_each_cpu(j, policy->related_cpus) { |
988bed09 | 1443 | per_cpu(cpufreq_cpu_data, j) = policy; |
2c1b5a84 | 1444 | add_cpu_dev_symlink(policy, j, get_cpu_device(j)); |
2f0ba790 | 1445 | } |
18c49926 VK |
1446 | |
1447 | policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req), | |
1448 | GFP_KERNEL); | |
b96f0384 WS |
1449 | if (!policy->min_freq_req) { |
1450 | ret = -ENOMEM; | |
18c49926 | 1451 | goto out_destroy_policy; |
b96f0384 | 1452 | } |
18c49926 | 1453 | |
3000ce3c RW |
1454 | ret = freq_qos_add_request(&policy->constraints, |
1455 | policy->min_freq_req, FREQ_QOS_MIN, | |
521223d8 | 1456 | FREQ_QOS_MIN_DEFAULT_VALUE); |
18c49926 VK |
1457 | if (ret < 0) { |
1458 | /* | |
3000ce3c | 1459 | * So we don't call freq_qos_remove_request() for an |
18c49926 VK |
1460 | * uninitialized request. |
1461 | */ | |
1462 | kfree(policy->min_freq_req); | |
1463 | policy->min_freq_req = NULL; | |
18c49926 VK |
1464 | goto out_destroy_policy; |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * This must be initialized right here to avoid calling | |
3000ce3c | 1469 | * freq_qos_remove_request() on uninitialized request in case |
18c49926 VK |
1470 | * of errors. |
1471 | */ | |
1472 | policy->max_freq_req = policy->min_freq_req + 1; | |
1473 | ||
3000ce3c RW |
1474 | ret = freq_qos_add_request(&policy->constraints, |
1475 | policy->max_freq_req, FREQ_QOS_MAX, | |
521223d8 | 1476 | FREQ_QOS_MAX_DEFAULT_VALUE); |
18c49926 VK |
1477 | if (ret < 0) { |
1478 | policy->max_freq_req = NULL; | |
18c49926 VK |
1479 | goto out_destroy_policy; |
1480 | } | |
6a149036 VK |
1481 | |
1482 | blocking_notifier_call_chain(&cpufreq_policy_notifier_list, | |
1483 | CPUFREQ_CREATE_POLICY, policy); | |
988bed09 | 1484 | } |
652ed95d | 1485 | |
5ddc6d4e | 1486 | if (cpufreq_driver->get && has_target()) { |
da60ce9f VK |
1487 | policy->cur = cpufreq_driver->get(policy->cpu); |
1488 | if (!policy->cur) { | |
b96f0384 | 1489 | ret = -EIO; |
da60ce9f | 1490 | pr_err("%s: ->get() failed\n", __func__); |
d417e069 | 1491 | goto out_destroy_policy; |
da60ce9f VK |
1492 | } |
1493 | } | |
1494 | ||
d3916691 VK |
1495 | /* |
1496 | * Sometimes boot loaders set CPU frequency to a value outside of | |
1497 | * frequency table present with cpufreq core. In such cases CPU might be | |
1498 | * unstable if it has to run on that frequency for long duration of time | |
1499 | * and so its better to set it to a frequency which is specified in | |
1500 | * freq-table. This also makes cpufreq stats inconsistent as | |
1501 | * cpufreq-stats would fail to register because current frequency of CPU | |
1502 | * isn't found in freq-table. | |
1503 | * | |
1504 | * Because we don't want this change to effect boot process badly, we go | |
1505 | * for the next freq which is >= policy->cur ('cur' must be set by now, | |
1506 | * otherwise we will end up setting freq to lowest of the table as 'cur' | |
1507 | * is initialized to zero). | |
1508 | * | |
1509 | * We are passing target-freq as "policy->cur - 1" otherwise | |
1510 | * __cpufreq_driver_target() would simply fail, as policy->cur will be | |
1511 | * equal to target-freq. | |
1512 | */ | |
1513 | if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) | |
1514 | && has_target()) { | |
97148d0a VK |
1515 | unsigned int old_freq = policy->cur; |
1516 | ||
d3916691 | 1517 | /* Are we running at unknown frequency ? */ |
97148d0a | 1518 | ret = cpufreq_frequency_table_get_index(policy, old_freq); |
d3916691 | 1519 | if (ret == -EINVAL) { |
97148d0a VK |
1520 | ret = __cpufreq_driver_target(policy, old_freq - 1, |
1521 | CPUFREQ_RELATION_L); | |
d3916691 VK |
1522 | |
1523 | /* | |
1524 | * Reaching here after boot in a few seconds may not | |
1525 | * mean that system will remain stable at "unknown" | |
1526 | * frequency for longer duration. Hence, a BUG_ON(). | |
1527 | */ | |
1528 | BUG_ON(ret); | |
97148d0a VK |
1529 | pr_info("%s: CPU%d: Running at unlisted initial frequency: %u KHz, changing to: %u KHz\n", |
1530 | __func__, policy->cpu, old_freq, policy->cur); | |
d3916691 VK |
1531 | } |
1532 | } | |
1533 | ||
194d99c7 | 1534 | if (new_policy) { |
d9612a49 | 1535 | ret = cpufreq_add_dev_interface(policy); |
a82fab29 | 1536 | if (ret) |
d417e069 | 1537 | goto out_destroy_policy; |
1aefc75b RW |
1538 | |
1539 | cpufreq_stats_create_table(policy); | |
8ff69732 | 1540 | |
988bed09 VK |
1541 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1542 | list_add(&policy->policy_list, &cpufreq_policy_list); | |
1543 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
c17495b0 VK |
1544 | |
1545 | /* | |
1546 | * Register with the energy model before | |
e7a1b32e | 1547 | * sugov_eas_rebuild_sd() is called, which will result |
c17495b0 VK |
1548 | * in rebuilding of the sched domains, which should only be done |
1549 | * once the energy model is properly initialized for the policy | |
1550 | * first. | |
1551 | * | |
1552 | * Also, this should be called before the policy is registered | |
1553 | * with cooling framework. | |
1554 | */ | |
1555 | if (cpufreq_driver->register_em) | |
1556 | cpufreq_driver->register_em(policy); | |
988bed09 | 1557 | } |
9515f4d6 | 1558 | |
7f0fa40f VK |
1559 | ret = cpufreq_init_policy(policy); |
1560 | if (ret) { | |
1561 | pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", | |
1562 | __func__, cpu, ret); | |
d417e069 | 1563 | goto out_destroy_policy; |
08fd8c1c | 1564 | } |
e18f1682 | 1565 | |
4e97b631 | 1566 | up_write(&policy->rwsem); |
08fd8c1c | 1567 | |
038c5b3e | 1568 | kobject_uevent(&policy->kobj, KOBJ_ADD); |
7c45cf31 | 1569 | |
4f774c4a BA |
1570 | /* Callback for handling stuff after policy is ready */ |
1571 | if (cpufreq_driver->ready) | |
1572 | cpufreq_driver->ready(policy); | |
1573 | ||
bcc61569 | 1574 | if (cpufreq_thermal_control_enabled(cpufreq_driver)) |
5c238a8b AK |
1575 | policy->cdev = of_cpufreq_cooling_register(policy); |
1576 | ||
2d06d8c4 | 1577 | pr_debug("initialization complete\n"); |
87c32271 | 1578 | |
1da177e4 LT |
1579 | return 0; |
1580 | ||
d417e069 | 1581 | out_destroy_policy: |
b24b6478 | 1582 | for_each_cpu(j, policy->real_cpus) |
5c84c1b8 | 1583 | remove_cpu_dev_symlink(policy, j, get_cpu_device(j)); |
b24b6478 | 1584 | |
3b718057 RW |
1585 | out_offline_policy: |
1586 | if (cpufreq_driver->offline) | |
1587 | cpufreq_driver->offline(policy); | |
1588 | ||
d417e069 | 1589 | out_exit_policy: |
da60ce9f VK |
1590 | if (cpufreq_driver->exit) |
1591 | cpufreq_driver->exit(policy); | |
2f0ba790 | 1592 | |
8101f997 | 1593 | out_free_policy: |
a2f6a7ac | 1594 | cpumask_clear(policy->cpus); |
514ff1bc SS |
1595 | up_write(&policy->rwsem); |
1596 | ||
f9f41e3e | 1597 | cpufreq_policy_free(policy); |
1da177e4 LT |
1598 | return ret; |
1599 | } | |
1600 | ||
0b275352 RW |
1601 | /** |
1602 | * cpufreq_add_dev - the cpufreq interface for a CPU device. | |
1603 | * @dev: CPU device. | |
1604 | * @sif: Subsystem interface structure pointer (not used) | |
1605 | */ | |
1606 | static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) | |
1607 | { | |
a794d613 | 1608 | struct cpufreq_policy *policy; |
0b275352 | 1609 | unsigned cpu = dev->id; |
26619804 | 1610 | int ret; |
0b275352 RW |
1611 | |
1612 | dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu); | |
1613 | ||
26619804 VK |
1614 | if (cpu_online(cpu)) { |
1615 | ret = cpufreq_online(cpu); | |
1616 | if (ret) | |
1617 | return ret; | |
1618 | } | |
0b275352 | 1619 | |
26619804 | 1620 | /* Create sysfs link on CPU registration */ |
a794d613 | 1621 | policy = per_cpu(cpufreq_cpu_data, cpu); |
2f0ba790 | 1622 | if (policy) |
2c1b5a84 | 1623 | add_cpu_dev_symlink(policy, cpu, dev); |
26619804 | 1624 | |
2f0ba790 | 1625 | return 0; |
1da177e4 LT |
1626 | } |
1627 | ||
fddd8f86 | 1628 | static void __cpufreq_offline(unsigned int cpu, struct cpufreq_policy *policy) |
1da177e4 | 1629 | { |
69cee714 | 1630 | int ret; |
1da177e4 | 1631 | |
45482c70 RW |
1632 | if (has_target()) |
1633 | cpufreq_stop_governor(policy); | |
1da177e4 | 1634 | |
9591becb | 1635 | cpumask_clear_cpu(cpu, policy->cpus); |
4573237b | 1636 | |
9591becb | 1637 | if (!policy_is_inactive(policy)) { |
e1e962c5 RW |
1638 | /* Nominate a new CPU if necessary. */ |
1639 | if (cpu == policy->cpu) | |
1640 | policy->cpu = cpumask_any(policy->cpus); | |
1641 | ||
1642 | /* Start the governor again for the active policy. */ | |
9591becb | 1643 | if (has_target()) { |
0a300767 | 1644 | ret = cpufreq_start_governor(policy); |
9591becb VK |
1645 | if (ret) |
1646 | pr_err("%s: Failed to start governor\n", __func__); | |
1647 | } | |
cedb70af | 1648 | |
fddd8f86 | 1649 | return; |
cedb70af SB |
1650 | } |
1651 | ||
e1e962c5 | 1652 | if (has_target()) |
0faf84ca | 1653 | strscpy(policy->last_governor, policy->governor->name, |
e1e962c5 RW |
1654 | CPUFREQ_NAME_LEN); |
1655 | else | |
1656 | policy->last_policy = policy->policy; | |
1657 | ||
bcc61569 | 1658 | if (cpufreq_thermal_control_enabled(cpufreq_driver)) { |
5c238a8b AK |
1659 | cpufreq_cooling_unregister(policy->cdev); |
1660 | policy->cdev = NULL; | |
1661 | } | |
1662 | ||
36be3418 RW |
1663 | if (has_target()) |
1664 | cpufreq_exit_governor(policy); | |
1da177e4 | 1665 | |
87549141 | 1666 | /* |
91a12e91 VK |
1667 | * Perform the ->offline() during light-weight tear-down, as |
1668 | * that allows fast recovery when the CPU comes back. | |
87549141 | 1669 | */ |
91a12e91 VK |
1670 | if (cpufreq_driver->offline) { |
1671 | cpufreq_driver->offline(policy); | |
1672 | } else if (cpufreq_driver->exit) { | |
87549141 | 1673 | cpufreq_driver->exit(policy); |
55582bcc SP |
1674 | policy->freq_table = NULL; |
1675 | } | |
fddd8f86 RW |
1676 | } |
1677 | ||
1678 | static int cpufreq_offline(unsigned int cpu) | |
1679 | { | |
1680 | struct cpufreq_policy *policy; | |
1681 | ||
1682 | pr_debug("%s: unregistering CPU %u\n", __func__, cpu); | |
1683 | ||
1684 | policy = cpufreq_cpu_get_raw(cpu); | |
1685 | if (!policy) { | |
1686 | pr_debug("%s: No cpu_data found\n", __func__); | |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | down_write(&policy->rwsem); | |
1691 | ||
1692 | __cpufreq_offline(cpu, policy); | |
49f18560 | 1693 | |
49f18560 | 1694 | up_write(&policy->rwsem); |
27622b06 | 1695 | return 0; |
1da177e4 LT |
1696 | } |
1697 | ||
a9909c21 | 1698 | /* |
27a862e9 | 1699 | * cpufreq_remove_dev - remove a CPU device |
cedb70af SB |
1700 | * |
1701 | * Removes the cpufreq interface for a CPU device. | |
cedb70af | 1702 | */ |
71db87ba | 1703 | static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
5a01f2e8 | 1704 | { |
8a25a2fd | 1705 | unsigned int cpu = dev->id; |
559ed407 | 1706 | struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
87549141 | 1707 | |
559ed407 | 1708 | if (!policy) |
1af115d6 | 1709 | return; |
87549141 | 1710 | |
f339f354 RW |
1711 | down_write(&policy->rwsem); |
1712 | ||
69cee714 | 1713 | if (cpu_online(cpu)) |
f339f354 | 1714 | __cpufreq_offline(cpu, policy); |
87549141 | 1715 | |
5c84c1b8 | 1716 | remove_cpu_dev_symlink(policy, cpu, dev); |
87549141 | 1717 | |
f339f354 RW |
1718 | if (!cpumask_empty(policy->real_cpus)) { |
1719 | up_write(&policy->rwsem); | |
1720 | return; | |
91a12e91 | 1721 | } |
f339f354 RW |
1722 | |
1723 | /* We did light-weight exit earlier, do full tear down now */ | |
1724 | if (cpufreq_driver->offline) | |
1725 | cpufreq_driver->exit(policy); | |
1726 | ||
1727 | up_write(&policy->rwsem); | |
1728 | ||
1729 | cpufreq_policy_free(policy); | |
5a01f2e8 VP |
1730 | } |
1731 | ||
1da177e4 | 1732 | /** |
ec06e586 RW |
1733 | * cpufreq_out_of_sync - Fix up actual and saved CPU frequency difference. |
1734 | * @policy: Policy managing CPUs. | |
1735 | * @new_freq: New CPU frequency. | |
1da177e4 | 1736 | * |
ec06e586 RW |
1737 | * Adjust to the current frequency first and clean up later by either calling |
1738 | * cpufreq_update_policy(), or scheduling handle_update(). | |
1da177e4 | 1739 | */ |
a1e1dc41 | 1740 | static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
e08f5f5b | 1741 | unsigned int new_freq) |
1da177e4 LT |
1742 | { |
1743 | struct cpufreq_freqs freqs; | |
b43a7ffb | 1744 | |
e837f9b5 | 1745 | pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
a1e1dc41 | 1746 | policy->cur, new_freq); |
1da177e4 | 1747 | |
a1e1dc41 | 1748 | freqs.old = policy->cur; |
1da177e4 | 1749 | freqs.new = new_freq; |
b43a7ffb | 1750 | |
8fec051e VK |
1751 | cpufreq_freq_transition_begin(policy, &freqs); |
1752 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
1da177e4 LT |
1753 | } |
1754 | ||
5980752e VK |
1755 | static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update) |
1756 | { | |
1757 | unsigned int new_freq; | |
1758 | ||
1759 | new_freq = cpufreq_driver->get(policy->cpu); | |
1760 | if (!new_freq) | |
1761 | return 0; | |
1762 | ||
1763 | /* | |
1764 | * If fast frequency switching is used with the given policy, the check | |
1765 | * against policy->cur is pointless, so skip it in that case. | |
1766 | */ | |
1767 | if (policy->fast_switch_enabled || !has_target()) | |
1768 | return new_freq; | |
1769 | ||
1770 | if (policy->cur != new_freq) { | |
f55ae08c VK |
1771 | /* |
1772 | * For some platforms, the frequency returned by hardware may be | |
1773 | * slightly different from what is provided in the frequency | |
1774 | * table, for example hardware may return 499 MHz instead of 500 | |
1775 | * MHz. In such cases it is better to avoid getting into | |
1776 | * unnecessary frequency updates. | |
1777 | */ | |
44295af5 | 1778 | if (abs(policy->cur - new_freq) < KHZ_PER_MHZ) |
f55ae08c VK |
1779 | return policy->cur; |
1780 | ||
5980752e VK |
1781 | cpufreq_out_of_sync(policy, new_freq); |
1782 | if (update) | |
1783 | schedule_work(&policy->update); | |
1784 | } | |
1785 | ||
1786 | return new_freq; | |
1787 | } | |
1788 | ||
32ee8c3e | 1789 | /** |
4ab70df4 | 1790 | * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
95235ca2 VP |
1791 | * @cpu: CPU number |
1792 | * | |
1793 | * This is the last known freq, without actually getting it from the driver. | |
1794 | * Return value will be same as what is shown in scaling_cur_freq in sysfs. | |
1795 | */ | |
1796 | unsigned int cpufreq_quick_get(unsigned int cpu) | |
1797 | { | |
9e21ba8b | 1798 | struct cpufreq_policy *policy; |
e08f5f5b | 1799 | unsigned int ret_freq = 0; |
c75361c0 | 1800 | unsigned long flags; |
95235ca2 | 1801 | |
c75361c0 RC |
1802 | read_lock_irqsave(&cpufreq_driver_lock, flags); |
1803 | ||
1804 | if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) { | |
1805 | ret_freq = cpufreq_driver->get(cpu); | |
1806 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
1807 | return ret_freq; | |
1808 | } | |
1809 | ||
1810 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
9e21ba8b DB |
1811 | |
1812 | policy = cpufreq_cpu_get(cpu); | |
95235ca2 | 1813 | if (policy) { |
e08f5f5b | 1814 | ret_freq = policy->cur; |
95235ca2 VP |
1815 | cpufreq_cpu_put(policy); |
1816 | } | |
1817 | ||
4d34a67d | 1818 | return ret_freq; |
95235ca2 VP |
1819 | } |
1820 | EXPORT_SYMBOL(cpufreq_quick_get); | |
1821 | ||
3d737108 JB |
1822 | /** |
1823 | * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU | |
1824 | * @cpu: CPU number | |
1825 | * | |
1826 | * Just return the max possible frequency for a given CPU. | |
1827 | */ | |
1828 | unsigned int cpufreq_quick_get_max(unsigned int cpu) | |
1829 | { | |
1830 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
1831 | unsigned int ret_freq = 0; | |
1832 | ||
1833 | if (policy) { | |
1834 | ret_freq = policy->max; | |
1835 | cpufreq_cpu_put(policy); | |
1836 | } | |
1837 | ||
1838 | return ret_freq; | |
1839 | } | |
1840 | EXPORT_SYMBOL(cpufreq_quick_get_max); | |
1841 | ||
bbce8eaa IV |
1842 | /** |
1843 | * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU | |
1844 | * @cpu: CPU number | |
1845 | * | |
1846 | * The default return value is the max_freq field of cpuinfo. | |
1847 | */ | |
1848 | __weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu) | |
1849 | { | |
1850 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); | |
1851 | unsigned int ret_freq = 0; | |
1852 | ||
1853 | if (policy) { | |
1854 | ret_freq = policy->cpuinfo.max_freq; | |
1855 | cpufreq_cpu_put(policy); | |
1856 | } | |
1857 | ||
1858 | return ret_freq; | |
1859 | } | |
1860 | EXPORT_SYMBOL(cpufreq_get_hw_max_freq); | |
1861 | ||
d92d50a4 | 1862 | static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
1da177e4 | 1863 | { |
4db7c34c | 1864 | if (unlikely(policy_is_inactive(policy))) |
5980752e | 1865 | return 0; |
1da177e4 | 1866 | |
5980752e | 1867 | return cpufreq_verify_current_freq(policy, true); |
5a01f2e8 | 1868 | } |
1da177e4 | 1869 | |
5a01f2e8 VP |
1870 | /** |
1871 | * cpufreq_get - get the current CPU frequency (in kHz) | |
1872 | * @cpu: CPU number | |
1873 | * | |
1874 | * Get the CPU current (static) CPU frequency | |
1875 | */ | |
1876 | unsigned int cpufreq_get(unsigned int cpu) | |
1877 | { | |
999976e0 | 1878 | struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
5a01f2e8 | 1879 | unsigned int ret_freq = 0; |
5a01f2e8 | 1880 | |
999976e0 AP |
1881 | if (policy) { |
1882 | down_read(&policy->rwsem); | |
4db7c34c YH |
1883 | if (cpufreq_driver->get) |
1884 | ret_freq = __cpufreq_get(policy); | |
999976e0 | 1885 | up_read(&policy->rwsem); |
5a01f2e8 | 1886 | |
999976e0 AP |
1887 | cpufreq_cpu_put(policy); |
1888 | } | |
6eed9404 | 1889 | |
4d34a67d | 1890 | return ret_freq; |
1da177e4 LT |
1891 | } |
1892 | EXPORT_SYMBOL(cpufreq_get); | |
1893 | ||
8a25a2fd KS |
1894 | static struct subsys_interface cpufreq_interface = { |
1895 | .name = "cpufreq", | |
1896 | .subsys = &cpu_subsys, | |
1897 | .add_dev = cpufreq_add_dev, | |
1898 | .remove_dev = cpufreq_remove_dev, | |
e00e56df RW |
1899 | }; |
1900 | ||
e28867ea VK |
1901 | /* |
1902 | * In case platform wants some specific frequency to be configured | |
1903 | * during suspend.. | |
1904 | */ | |
1905 | int cpufreq_generic_suspend(struct cpufreq_policy *policy) | |
1906 | { | |
1907 | int ret; | |
1908 | ||
1909 | if (!policy->suspend_freq) { | |
201f3716 BZ |
1910 | pr_debug("%s: suspend_freq not defined\n", __func__); |
1911 | return 0; | |
e28867ea VK |
1912 | } |
1913 | ||
1914 | pr_debug("%s: Setting suspend-freq: %u\n", __func__, | |
1915 | policy->suspend_freq); | |
1916 | ||
1917 | ret = __cpufreq_driver_target(policy, policy->suspend_freq, | |
1918 | CPUFREQ_RELATION_H); | |
1919 | if (ret) | |
1920 | pr_err("%s: unable to set suspend-freq: %u. err: %d\n", | |
1921 | __func__, policy->suspend_freq, ret); | |
1922 | ||
1923 | return ret; | |
1924 | } | |
1925 | EXPORT_SYMBOL(cpufreq_generic_suspend); | |
1926 | ||
42d4dc3f | 1927 | /** |
ec06e586 | 1928 | * cpufreq_suspend() - Suspend CPUFreq governors. |
e00e56df | 1929 | * |
2f0aea93 VK |
1930 | * Called during system wide Suspend/Hibernate cycles for suspending governors |
1931 | * as some platforms can't change frequency after this point in suspend cycle. | |
1932 | * Because some of the devices (like: i2c, regulators, etc) they use for | |
1933 | * changing frequency are suspended quickly after this point. | |
42d4dc3f | 1934 | */ |
2f0aea93 | 1935 | void cpufreq_suspend(void) |
42d4dc3f | 1936 | { |
3a3e9e06 | 1937 | struct cpufreq_policy *policy; |
42d4dc3f | 1938 | |
2f0aea93 VK |
1939 | if (!cpufreq_driver) |
1940 | return; | |
42d4dc3f | 1941 | |
ba41e1bc | 1942 | if (!has_target() && !cpufreq_driver->suspend) |
b1b12bab | 1943 | goto suspend; |
42d4dc3f | 1944 | |
2f0aea93 VK |
1945 | pr_debug("%s: Suspending Governors\n", __func__); |
1946 | ||
f963735a | 1947 | for_each_active_policy(policy) { |
ba41e1bc RW |
1948 | if (has_target()) { |
1949 | down_write(&policy->rwsem); | |
45482c70 | 1950 | cpufreq_stop_governor(policy); |
ba41e1bc | 1951 | up_write(&policy->rwsem); |
ba41e1bc RW |
1952 | } |
1953 | ||
1954 | if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy)) | |
e9a7cc1d FF |
1955 | pr_err("%s: Failed to suspend driver: %s\n", __func__, |
1956 | cpufreq_driver->name); | |
42d4dc3f | 1957 | } |
b1b12bab VK |
1958 | |
1959 | suspend: | |
1960 | cpufreq_suspended = true; | |
42d4dc3f BH |
1961 | } |
1962 | ||
1da177e4 | 1963 | /** |
ec06e586 | 1964 | * cpufreq_resume() - Resume CPUFreq governors. |
1da177e4 | 1965 | * |
2f0aea93 VK |
1966 | * Called during system wide Suspend/Hibernate cycle for resuming governors that |
1967 | * are suspended with cpufreq_suspend(). | |
1da177e4 | 1968 | */ |
2f0aea93 | 1969 | void cpufreq_resume(void) |
1da177e4 | 1970 | { |
3a3e9e06 | 1971 | struct cpufreq_policy *policy; |
49f18560 | 1972 | int ret; |
1da177e4 | 1973 | |
2f0aea93 | 1974 | if (!cpufreq_driver) |
703cbaa6 BY |
1975 | return; |
1976 | ||
1977 | if (unlikely(!cpufreq_suspended)) | |
2f0aea93 | 1978 | return; |
1da177e4 | 1979 | |
8e30444e LT |
1980 | cpufreq_suspended = false; |
1981 | ||
ba41e1bc | 1982 | if (!has_target() && !cpufreq_driver->resume) |
e00e56df | 1983 | return; |
1da177e4 | 1984 | |
2f0aea93 | 1985 | pr_debug("%s: Resuming Governors\n", __func__); |
1da177e4 | 1986 | |
f963735a | 1987 | for_each_active_policy(policy) { |
49f18560 | 1988 | if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) { |
1f464cb4 LC |
1989 | pr_err("%s: Failed to resume driver: %s\n", __func__, |
1990 | cpufreq_driver->name); | |
ba41e1bc | 1991 | } else if (has_target()) { |
49f18560 | 1992 | down_write(&policy->rwsem); |
0a300767 | 1993 | ret = cpufreq_start_governor(policy); |
49f18560 VK |
1994 | up_write(&policy->rwsem); |
1995 | ||
1996 | if (ret) | |
1f464cb4 LC |
1997 | pr_err("%s: Failed to start governor for CPU%u's policy\n", |
1998 | __func__, policy->cpu); | |
49f18560 | 1999 | } |
2f0aea93 VK |
2000 | } |
2001 | } | |
1da177e4 | 2002 | |
a62f68f5 RW |
2003 | /** |
2004 | * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones. | |
2005 | * @flags: Flags to test against the current cpufreq driver's flags. | |
2006 | * | |
2007 | * Assumes that the driver is there, so callers must ensure that this is the | |
2008 | * case. | |
2009 | */ | |
2010 | bool cpufreq_driver_test_flags(u16 flags) | |
2011 | { | |
2012 | return !!(cpufreq_driver->flags & flags); | |
2013 | } | |
2014 | ||
9d95046e | 2015 | /** |
ec06e586 | 2016 | * cpufreq_get_current_driver - Return the current driver's name. |
9d95046e | 2017 | * |
ec06e586 RW |
2018 | * Return the name string of the currently registered cpufreq driver or NULL if |
2019 | * none. | |
9d95046e BP |
2020 | */ |
2021 | const char *cpufreq_get_current_driver(void) | |
2022 | { | |
1c3d85dd RW |
2023 | if (cpufreq_driver) |
2024 | return cpufreq_driver->name; | |
2025 | ||
2026 | return NULL; | |
9d95046e BP |
2027 | } |
2028 | EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); | |
1da177e4 | 2029 | |
51315cdf | 2030 | /** |
ec06e586 | 2031 | * cpufreq_get_driver_data - Return current driver data. |
51315cdf | 2032 | * |
ec06e586 RW |
2033 | * Return the private data of the currently registered cpufreq driver, or NULL |
2034 | * if no cpufreq driver has been registered. | |
51315cdf TP |
2035 | */ |
2036 | void *cpufreq_get_driver_data(void) | |
2037 | { | |
2038 | if (cpufreq_driver) | |
2039 | return cpufreq_driver->driver_data; | |
2040 | ||
2041 | return NULL; | |
2042 | } | |
2043 | EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); | |
2044 | ||
1da177e4 LT |
2045 | /********************************************************************* |
2046 | * NOTIFIER LISTS INTERFACE * | |
2047 | *********************************************************************/ | |
2048 | ||
2049 | /** | |
ec06e586 RW |
2050 | * cpufreq_register_notifier - Register a notifier with cpufreq. |
2051 | * @nb: notifier function to register. | |
2052 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER. | |
1da177e4 | 2053 | * |
ec06e586 RW |
2054 | * Add a notifier to one of two lists: either a list of notifiers that run on |
2055 | * clock rate changes (once before and once after every transition), or a list | |
2056 | * of notifiers that ron on cpufreq policy changes. | |
1da177e4 | 2057 | * |
ec06e586 RW |
2058 | * This function may sleep and it has the same return values as |
2059 | * blocking_notifier_chain_register(). | |
1da177e4 LT |
2060 | */ |
2061 | int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) | |
2062 | { | |
2063 | int ret; | |
2064 | ||
d5aaffa9 DB |
2065 | if (cpufreq_disabled()) |
2066 | return -EINVAL; | |
2067 | ||
1da177e4 LT |
2068 | switch (list) { |
2069 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b7898fda RW |
2070 | mutex_lock(&cpufreq_fast_switch_lock); |
2071 | ||
2072 | if (cpufreq_fast_switch_count > 0) { | |
2073 | mutex_unlock(&cpufreq_fast_switch_lock); | |
2074 | return -EBUSY; | |
2075 | } | |
b4dfdbb3 | 2076 | ret = srcu_notifier_chain_register( |
e041c683 | 2077 | &cpufreq_transition_notifier_list, nb); |
b7898fda RW |
2078 | if (!ret) |
2079 | cpufreq_fast_switch_count--; | |
2080 | ||
2081 | mutex_unlock(&cpufreq_fast_switch_lock); | |
1da177e4 LT |
2082 | break; |
2083 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
2084 | ret = blocking_notifier_chain_register( |
2085 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
2086 | break; |
2087 | default: | |
2088 | ret = -EINVAL; | |
2089 | } | |
1da177e4 LT |
2090 | |
2091 | return ret; | |
2092 | } | |
2093 | EXPORT_SYMBOL(cpufreq_register_notifier); | |
2094 | ||
1da177e4 | 2095 | /** |
ec06e586 RW |
2096 | * cpufreq_unregister_notifier - Unregister a notifier from cpufreq. |
2097 | * @nb: notifier block to be unregistered. | |
2098 | * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER. | |
1da177e4 | 2099 | * |
ec06e586 | 2100 | * Remove a notifier from one of the cpufreq notifier lists. |
1da177e4 | 2101 | * |
ec06e586 RW |
2102 | * This function may sleep and it has the same return values as |
2103 | * blocking_notifier_chain_unregister(). | |
1da177e4 LT |
2104 | */ |
2105 | int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) | |
2106 | { | |
2107 | int ret; | |
2108 | ||
d5aaffa9 DB |
2109 | if (cpufreq_disabled()) |
2110 | return -EINVAL; | |
2111 | ||
1da177e4 LT |
2112 | switch (list) { |
2113 | case CPUFREQ_TRANSITION_NOTIFIER: | |
b7898fda RW |
2114 | mutex_lock(&cpufreq_fast_switch_lock); |
2115 | ||
b4dfdbb3 | 2116 | ret = srcu_notifier_chain_unregister( |
e041c683 | 2117 | &cpufreq_transition_notifier_list, nb); |
b7898fda RW |
2118 | if (!ret && !WARN_ON(cpufreq_fast_switch_count >= 0)) |
2119 | cpufreq_fast_switch_count++; | |
2120 | ||
2121 | mutex_unlock(&cpufreq_fast_switch_lock); | |
1da177e4 LT |
2122 | break; |
2123 | case CPUFREQ_POLICY_NOTIFIER: | |
e041c683 AS |
2124 | ret = blocking_notifier_chain_unregister( |
2125 | &cpufreq_policy_notifier_list, nb); | |
1da177e4 LT |
2126 | break; |
2127 | default: | |
2128 | ret = -EINVAL; | |
2129 | } | |
1da177e4 LT |
2130 | |
2131 | return ret; | |
2132 | } | |
2133 | EXPORT_SYMBOL(cpufreq_unregister_notifier); | |
2134 | ||
2135 | ||
2136 | /********************************************************************* | |
2137 | * GOVERNORS * | |
2138 | *********************************************************************/ | |
2139 | ||
b7898fda RW |
2140 | /** |
2141 | * cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch. | |
2142 | * @policy: cpufreq policy to switch the frequency for. | |
2143 | * @target_freq: New frequency to set (may be approximate). | |
2144 | * | |
2145 | * Carry out a fast frequency switch without sleeping. | |
2146 | * | |
2147 | * The driver's ->fast_switch() callback invoked by this function must be | |
2148 | * suitable for being called from within RCU-sched read-side critical sections | |
2149 | * and it is expected to select the minimum available frequency greater than or | |
2150 | * equal to @target_freq (CPUFREQ_RELATION_L). | |
2151 | * | |
2152 | * This function must not be called if policy->fast_switch_enabled is unset. | |
2153 | * | |
2154 | * Governors calling this function must guarantee that it will never be invoked | |
2155 | * twice in parallel for the same policy and that it will never be called in | |
2156 | * parallel with either ->target() or ->target_index() for the same policy. | |
2157 | * | |
209887e6 VK |
2158 | * Returns the actual frequency set for the CPU. |
2159 | * | |
2160 | * If 0 is returned by the driver's ->fast_switch() callback to indicate an | |
2161 | * error condition, the hardware configuration must be preserved. | |
b7898fda RW |
2162 | */ |
2163 | unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, | |
2164 | unsigned int target_freq) | |
2165 | { | |
1a0419b0 | 2166 | unsigned int freq; |
08d8c65e | 2167 | int cpu; |
1a0419b0 | 2168 | |
b9af6948 | 2169 | target_freq = clamp_val(target_freq, policy->min, policy->max); |
1a0419b0 IV |
2170 | freq = cpufreq_driver->fast_switch(policy, target_freq); |
2171 | ||
96f60cdd VK |
2172 | if (!freq) |
2173 | return 0; | |
2174 | ||
08d8c65e | 2175 | policy->cur = freq; |
1a0419b0 | 2176 | arch_set_freq_scale(policy->related_cpus, freq, |
599457ba | 2177 | arch_scale_freq_ref(policy->cpu)); |
96f60cdd | 2178 | cpufreq_stats_record_transition(policy, freq); |
b7898fda | 2179 | |
08d8c65e VK |
2180 | if (trace_cpu_frequency_enabled()) { |
2181 | for_each_cpu(cpu, policy->cpus) | |
2182 | trace_cpu_frequency(freq, cpu); | |
2183 | } | |
2184 | ||
1a0419b0 | 2185 | return freq; |
b7898fda RW |
2186 | } |
2187 | EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch); | |
2188 | ||
ee2cc427 RW |
2189 | /** |
2190 | * cpufreq_driver_adjust_perf - Adjust CPU performance level in one go. | |
2191 | * @cpu: Target CPU. | |
2192 | * @min_perf: Minimum (required) performance level (units of @capacity). | |
4e6df217 | 2193 | * @target_perf: Target (desired) performance level (units of @capacity). |
ee2cc427 RW |
2194 | * @capacity: Capacity of the target CPU. |
2195 | * | |
2196 | * Carry out a fast performance level switch of @cpu without sleeping. | |
2197 | * | |
2198 | * The driver's ->adjust_perf() callback invoked by this function must be | |
2199 | * suitable for being called from within RCU-sched read-side critical sections | |
2200 | * and it is expected to select a suitable performance level equal to or above | |
2201 | * @min_perf and preferably equal to or below @target_perf. | |
2202 | * | |
2203 | * This function must not be called if policy->fast_switch_enabled is unset. | |
2204 | * | |
2205 | * Governors calling this function must guarantee that it will never be invoked | |
2206 | * twice in parallel for the same CPU and that it will never be called in | |
2207 | * parallel with either ->target() or ->target_index() or ->fast_switch() for | |
2208 | * the same CPU. | |
2209 | */ | |
2210 | void cpufreq_driver_adjust_perf(unsigned int cpu, | |
2211 | unsigned long min_perf, | |
2212 | unsigned long target_perf, | |
2213 | unsigned long capacity) | |
2214 | { | |
2215 | cpufreq_driver->adjust_perf(cpu, min_perf, target_perf, capacity); | |
2216 | } | |
2217 | ||
2218 | /** | |
2219 | * cpufreq_driver_has_adjust_perf - Check "direct fast switch" callback. | |
2220 | * | |
2221 | * Return 'true' if the ->adjust_perf callback is present for the | |
2222 | * current driver or 'false' otherwise. | |
2223 | */ | |
2224 | bool cpufreq_driver_has_adjust_perf(void) | |
2225 | { | |
2226 | return !!cpufreq_driver->adjust_perf; | |
2227 | } | |
2228 | ||
1c03a2d0 VK |
2229 | /* Must set freqs->new to intermediate frequency */ |
2230 | static int __target_intermediate(struct cpufreq_policy *policy, | |
2231 | struct cpufreq_freqs *freqs, int index) | |
2232 | { | |
2233 | int ret; | |
2234 | ||
2235 | freqs->new = cpufreq_driver->get_intermediate(policy, index); | |
2236 | ||
2237 | /* We don't need to switch to intermediate freq */ | |
2238 | if (!freqs->new) | |
2239 | return 0; | |
2240 | ||
2241 | pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", | |
2242 | __func__, policy->cpu, freqs->old, freqs->new); | |
2243 | ||
2244 | cpufreq_freq_transition_begin(policy, freqs); | |
2245 | ret = cpufreq_driver->target_intermediate(policy, index); | |
2246 | cpufreq_freq_transition_end(policy, freqs, ret); | |
2247 | ||
2248 | if (ret) | |
2249 | pr_err("%s: Failed to change to intermediate frequency: %d\n", | |
2250 | __func__, ret); | |
2251 | ||
2252 | return ret; | |
2253 | } | |
2254 | ||
23727845 | 2255 | static int __target_index(struct cpufreq_policy *policy, int index) |
8d65775d | 2256 | { |
1c03a2d0 | 2257 | struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
56a7ff75 | 2258 | unsigned int restore_freq, intermediate_freq = 0; |
23727845 | 2259 | unsigned int newfreq = policy->freq_table[index].frequency; |
8d65775d VK |
2260 | int retval = -EINVAL; |
2261 | bool notify; | |
2262 | ||
23727845 VK |
2263 | if (newfreq == policy->cur) |
2264 | return 0; | |
2265 | ||
56a7ff75 RW |
2266 | /* Save last value to restore later on errors */ |
2267 | restore_freq = policy->cur; | |
2268 | ||
8d65775d | 2269 | notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); |
8d65775d | 2270 | if (notify) { |
1c03a2d0 VK |
2271 | /* Handle switching to intermediate frequency */ |
2272 | if (cpufreq_driver->get_intermediate) { | |
2273 | retval = __target_intermediate(policy, &freqs, index); | |
2274 | if (retval) | |
2275 | return retval; | |
2276 | ||
2277 | intermediate_freq = freqs.new; | |
2278 | /* Set old freq to intermediate */ | |
2279 | if (intermediate_freq) | |
2280 | freqs.old = freqs.new; | |
2281 | } | |
8d65775d | 2282 | |
23727845 | 2283 | freqs.new = newfreq; |
8d65775d VK |
2284 | pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
2285 | __func__, policy->cpu, freqs.old, freqs.new); | |
2286 | ||
2287 | cpufreq_freq_transition_begin(policy, &freqs); | |
2288 | } | |
2289 | ||
2290 | retval = cpufreq_driver->target_index(policy, index); | |
2291 | if (retval) | |
2292 | pr_err("%s: Failed to change cpu frequency: %d\n", __func__, | |
2293 | retval); | |
2294 | ||
1c03a2d0 | 2295 | if (notify) { |
8d65775d VK |
2296 | cpufreq_freq_transition_end(policy, &freqs, retval); |
2297 | ||
1c03a2d0 VK |
2298 | /* |
2299 | * Failed after setting to intermediate freq? Driver should have | |
2300 | * reverted back to initial frequency and so should we. Check | |
2301 | * here for intermediate_freq instead of get_intermediate, in | |
58405af6 | 2302 | * case we haven't switched to intermediate freq at all. |
1c03a2d0 VK |
2303 | */ |
2304 | if (unlikely(retval && intermediate_freq)) { | |
2305 | freqs.old = intermediate_freq; | |
56a7ff75 | 2306 | freqs.new = restore_freq; |
1c03a2d0 VK |
2307 | cpufreq_freq_transition_begin(policy, &freqs); |
2308 | cpufreq_freq_transition_end(policy, &freqs, 0); | |
2309 | } | |
2310 | } | |
2311 | ||
8d65775d VK |
2312 | return retval; |
2313 | } | |
2314 | ||
1da177e4 LT |
2315 | int __cpufreq_driver_target(struct cpufreq_policy *policy, |
2316 | unsigned int target_freq, | |
2317 | unsigned int relation) | |
2318 | { | |
7249924e | 2319 | unsigned int old_target_freq = target_freq; |
c32b6b8e | 2320 | |
a7b422cd KRW |
2321 | if (cpufreq_disabled()) |
2322 | return -ENODEV; | |
2323 | ||
f9ccdec2 | 2324 | target_freq = __resolve_freq(policy, target_freq, relation); |
7249924e VK |
2325 | |
2326 | pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", | |
e837f9b5 | 2327 | policy->cpu, target_freq, relation, old_target_freq); |
5a1c0228 | 2328 | |
9c0ebcf7 VK |
2329 | /* |
2330 | * This might look like a redundant call as we are checking it again | |
2331 | * after finding index. But it is left intentionally for cases where | |
2332 | * exactly same freq is called again and so we can save on few function | |
2333 | * calls. | |
2334 | */ | |
1c534352 RW |
2335 | if (target_freq == policy->cur && |
2336 | !(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS)) | |
5a1c0228 VK |
2337 | return 0; |
2338 | ||
1f39fa0d VD |
2339 | if (cpufreq_driver->target) { |
2340 | /* | |
2341 | * If the driver hasn't setup a single inefficient frequency, | |
2342 | * it's unlikely it knows how to decode CPUFREQ_RELATION_E. | |
2343 | */ | |
2344 | if (!policy->efficiencies_available) | |
2345 | relation &= ~CPUFREQ_RELATION_E; | |
2346 | ||
6019d23a | 2347 | return cpufreq_driver->target(policy, target_freq, relation); |
1f39fa0d | 2348 | } |
9c0ebcf7 | 2349 | |
6019d23a RW |
2350 | if (!cpufreq_driver->target_index) |
2351 | return -EINVAL; | |
9c0ebcf7 | 2352 | |
f9ccdec2 | 2353 | return __target_index(policy, policy->cached_resolved_idx); |
1da177e4 LT |
2354 | } |
2355 | EXPORT_SYMBOL_GPL(__cpufreq_driver_target); | |
2356 | ||
1da177e4 LT |
2357 | int cpufreq_driver_target(struct cpufreq_policy *policy, |
2358 | unsigned int target_freq, | |
2359 | unsigned int relation) | |
2360 | { | |
62c23a89 | 2361 | int ret; |
1da177e4 | 2362 | |
ad7722da | 2363 | down_write(&policy->rwsem); |
1da177e4 LT |
2364 | |
2365 | ret = __cpufreq_driver_target(policy, target_freq, relation); | |
2366 | ||
ad7722da | 2367 | up_write(&policy->rwsem); |
1da177e4 | 2368 | |
1da177e4 LT |
2369 | return ret; |
2370 | } | |
2371 | EXPORT_SYMBOL_GPL(cpufreq_driver_target); | |
2372 | ||
de1df26b RW |
2373 | __weak struct cpufreq_governor *cpufreq_fallback_governor(void) |
2374 | { | |
2375 | return NULL; | |
2376 | } | |
2377 | ||
a92604b4 | 2378 | static int cpufreq_init_governor(struct cpufreq_policy *policy) |
1da177e4 | 2379 | { |
cc993cab | 2380 | int ret; |
6afde10c | 2381 | |
2f0aea93 VK |
2382 | /* Don't start any governor operations if we are entering suspend */ |
2383 | if (cpufreq_suspended) | |
2384 | return 0; | |
cb57720b EZ |
2385 | /* |
2386 | * Governor might not be initiated here if ACPI _PPC changed | |
2387 | * notification happened, so check it. | |
2388 | */ | |
2389 | if (!policy->governor) | |
2390 | return -EINVAL; | |
2f0aea93 | 2391 | |
ed4676e2 | 2392 | /* Platform doesn't want dynamic frequency switching ? */ |
9a2a9ebc | 2393 | if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING && |
fc4c709f | 2394 | cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) { |
de1df26b RW |
2395 | struct cpufreq_governor *gov = cpufreq_fallback_governor(); |
2396 | ||
2397 | if (gov) { | |
fe829ed8 | 2398 | pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n", |
e837f9b5 | 2399 | policy->governor->name, gov->name); |
6afde10c | 2400 | policy->governor = gov; |
de1df26b RW |
2401 | } else { |
2402 | return -EINVAL; | |
6afde10c | 2403 | } |
1c256245 | 2404 | } |
1da177e4 | 2405 | |
a92604b4 RW |
2406 | if (!try_module_get(policy->governor->owner)) |
2407 | return -EINVAL; | |
95731ebb | 2408 | |
a92604b4 | 2409 | pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
1da177e4 | 2410 | |
e788892b RW |
2411 | if (policy->governor->init) { |
2412 | ret = policy->governor->init(policy); | |
2413 | if (ret) { | |
36be3418 | 2414 | module_put(policy->governor->owner); |
e788892b RW |
2415 | return ret; |
2416 | } | |
36be3418 | 2417 | } |
1da177e4 | 2418 | |
ea9364bb RW |
2419 | policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET); |
2420 | ||
a92604b4 RW |
2421 | return 0; |
2422 | } | |
2423 | ||
2424 | static void cpufreq_exit_governor(struct cpufreq_policy *policy) | |
2425 | { | |
2426 | if (cpufreq_suspended || !policy->governor) | |
2427 | return; | |
2428 | ||
2429 | pr_debug("%s: for CPU %u\n", __func__, policy->cpu); | |
2430 | ||
e788892b RW |
2431 | if (policy->governor->exit) |
2432 | policy->governor->exit(policy); | |
a92604b4 | 2433 | |
a92604b4 | 2434 | module_put(policy->governor->owner); |
1da177e4 LT |
2435 | } |
2436 | ||
f6ebbcf0 | 2437 | int cpufreq_start_governor(struct cpufreq_policy *policy) |
0a300767 RW |
2438 | { |
2439 | int ret; | |
2440 | ||
a92604b4 RW |
2441 | if (cpufreq_suspended) |
2442 | return 0; | |
2443 | ||
2444 | if (!policy->governor) | |
2445 | return -EINVAL; | |
2446 | ||
2447 | pr_debug("%s: for CPU %u\n", __func__, policy->cpu); | |
2448 | ||
407d0fff | 2449 | if (cpufreq_driver->get) |
5980752e | 2450 | cpufreq_verify_current_freq(policy, false); |
3bbf8fe3 | 2451 | |
e788892b RW |
2452 | if (policy->governor->start) { |
2453 | ret = policy->governor->start(policy); | |
2454 | if (ret) | |
2455 | return ret; | |
2456 | } | |
2457 | ||
2458 | if (policy->governor->limits) | |
2459 | policy->governor->limits(policy); | |
d6ff44d6 | 2460 | |
d6ff44d6 | 2461 | return 0; |
0a300767 RW |
2462 | } |
2463 | ||
f6ebbcf0 | 2464 | void cpufreq_stop_governor(struct cpufreq_policy *policy) |
a92604b4 RW |
2465 | { |
2466 | if (cpufreq_suspended || !policy->governor) | |
2467 | return; | |
2468 | ||
2469 | pr_debug("%s: for CPU %u\n", __func__, policy->cpu); | |
2470 | ||
e788892b RW |
2471 | if (policy->governor->stop) |
2472 | policy->governor->stop(policy); | |
a92604b4 RW |
2473 | } |
2474 | ||
2475 | static void cpufreq_governor_limits(struct cpufreq_policy *policy) | |
2476 | { | |
2477 | if (cpufreq_suspended || !policy->governor) | |
2478 | return; | |
2479 | ||
2480 | pr_debug("%s: for CPU %u\n", __func__, policy->cpu); | |
2481 | ||
e788892b RW |
2482 | if (policy->governor->limits) |
2483 | policy->governor->limits(policy); | |
0a300767 RW |
2484 | } |
2485 | ||
1da177e4 LT |
2486 | int cpufreq_register_governor(struct cpufreq_governor *governor) |
2487 | { | |
3bcb09a3 | 2488 | int err; |
1da177e4 LT |
2489 | |
2490 | if (!governor) | |
2491 | return -EINVAL; | |
2492 | ||
a7b422cd KRW |
2493 | if (cpufreq_disabled()) |
2494 | return -ENODEV; | |
2495 | ||
3fc54d37 | 2496 | mutex_lock(&cpufreq_governor_mutex); |
32ee8c3e | 2497 | |
3bcb09a3 | 2498 | err = -EBUSY; |
42f91fa1 | 2499 | if (!find_governor(governor->name)) { |
3bcb09a3 JF |
2500 | err = 0; |
2501 | list_add(&governor->governor_list, &cpufreq_governor_list); | |
1da177e4 | 2502 | } |
1da177e4 | 2503 | |
32ee8c3e | 2504 | mutex_unlock(&cpufreq_governor_mutex); |
3bcb09a3 | 2505 | return err; |
1da177e4 LT |
2506 | } |
2507 | EXPORT_SYMBOL_GPL(cpufreq_register_governor); | |
2508 | ||
1da177e4 LT |
2509 | void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
2510 | { | |
4573237b VK |
2511 | struct cpufreq_policy *policy; |
2512 | unsigned long flags; | |
90e41bac | 2513 | |
1da177e4 LT |
2514 | if (!governor) |
2515 | return; | |
2516 | ||
a7b422cd KRW |
2517 | if (cpufreq_disabled()) |
2518 | return; | |
2519 | ||
4573237b VK |
2520 | /* clear last_governor for all inactive policies */ |
2521 | read_lock_irqsave(&cpufreq_driver_lock, flags); | |
2522 | for_each_inactive_policy(policy) { | |
18bf3a12 VK |
2523 | if (!strcmp(policy->last_governor, governor->name)) { |
2524 | policy->governor = NULL; | |
4573237b | 2525 | strcpy(policy->last_governor, "\0"); |
18bf3a12 | 2526 | } |
90e41bac | 2527 | } |
4573237b | 2528 | read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
90e41bac | 2529 | |
3fc54d37 | 2530 | mutex_lock(&cpufreq_governor_mutex); |
1da177e4 | 2531 | list_del(&governor->governor_list); |
3fc54d37 | 2532 | mutex_unlock(&cpufreq_governor_mutex); |
1da177e4 LT |
2533 | } |
2534 | EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); | |
2535 | ||
2536 | ||
1da177e4 LT |
2537 | /********************************************************************* |
2538 | * POLICY INTERFACE * | |
2539 | *********************************************************************/ | |
2540 | ||
2541 | /** | |
2542 | * cpufreq_get_policy - get the current cpufreq_policy | |
29464f28 DJ |
2543 | * @policy: struct cpufreq_policy into which the current cpufreq_policy |
2544 | * is written | |
a9909c21 | 2545 | * @cpu: CPU to find the policy for |
1da177e4 LT |
2546 | * |
2547 | * Reads the current cpufreq policy. | |
2548 | */ | |
2549 | int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) | |
2550 | { | |
2551 | struct cpufreq_policy *cpu_policy; | |
2552 | if (!policy) | |
2553 | return -EINVAL; | |
2554 | ||
2555 | cpu_policy = cpufreq_cpu_get(cpu); | |
2556 | if (!cpu_policy) | |
2557 | return -EINVAL; | |
2558 | ||
d5b73cd8 | 2559 | memcpy(policy, cpu_policy, sizeof(*policy)); |
1da177e4 LT |
2560 | |
2561 | cpufreq_cpu_put(cpu_policy); | |
1da177e4 LT |
2562 | return 0; |
2563 | } | |
2564 | EXPORT_SYMBOL(cpufreq_get_policy); | |
2565 | ||
a0dbb819 RW |
2566 | /** |
2567 | * cpufreq_set_policy - Modify cpufreq policy parameters. | |
2568 | * @policy: Policy object to modify. | |
1e4f63ae RW |
2569 | * @new_gov: Policy governor pointer. |
2570 | * @new_pol: Policy value (for drivers with built-in governors). | |
a0dbb819 | 2571 | * |
1e4f63ae RW |
2572 | * Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency |
2573 | * limits to be set for the policy, update @policy with the verified limits | |
2574 | * values and either invoke the driver's ->setpolicy() callback (if present) or | |
2575 | * carry out a governor update for @policy. That is, run the current governor's | |
2576 | * ->limits() callback (if @new_gov points to the same object as the one in | |
2577 | * @policy) or replace the governor for @policy with @new_gov. | |
a0dbb819 RW |
2578 | * |
2579 | * The cpuinfo part of @policy is not updated by this function. | |
153d7f3f | 2580 | */ |
1e4f63ae RW |
2581 | static int cpufreq_set_policy(struct cpufreq_policy *policy, |
2582 | struct cpufreq_governor *new_gov, | |
2583 | unsigned int new_pol) | |
1da177e4 | 2584 | { |
1e4f63ae | 2585 | struct cpufreq_policy_data new_data; |
d9a789c7 RW |
2586 | struct cpufreq_governor *old_gov; |
2587 | int ret; | |
1da177e4 | 2588 | |
1e4f63ae RW |
2589 | memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
2590 | new_data.freq_table = policy->freq_table; | |
2591 | new_data.cpu = policy->cpu; | |
fba9573b | 2592 | /* |
67d874c3 VK |
2593 | * PM QoS framework collects all the requests from users and provide us |
2594 | * the final aggregated value here. | |
2595 | */ | |
1e4f63ae RW |
2596 | new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN); |
2597 | new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX); | |
2598 | ||
2599 | pr_debug("setting new policy for CPU %u: %u - %u kHz\n", | |
2600 | new_data.cpu, new_data.min, new_data.max); | |
9c9a43ed | 2601 | |
737ffb27 VK |
2602 | /* |
2603 | * Verify that the CPU speed can be set within these limits and make sure | |
2604 | * that min <= max. | |
2605 | */ | |
1e4f63ae | 2606 | ret = cpufreq_driver->verify(&new_data); |
1da177e4 | 2607 | if (ret) |
d9a789c7 | 2608 | return ret; |
1da177e4 | 2609 | |
15171769 VD |
2610 | /* |
2611 | * Resolve policy min/max to available frequencies. It ensures | |
2612 | * no frequency resolution will neither overshoot the requested maximum | |
2613 | * nor undershoot the requested minimum. | |
2614 | */ | |
1e4f63ae RW |
2615 | policy->min = new_data.min; |
2616 | policy->max = new_data.max; | |
15171769 VD |
2617 | policy->min = __resolve_freq(policy, policy->min, CPUFREQ_RELATION_L); |
2618 | policy->max = __resolve_freq(policy, policy->max, CPUFREQ_RELATION_H); | |
601b2185 | 2619 | trace_cpu_frequency_limits(policy); |
1da177e4 | 2620 | |
e3c06236 SM |
2621 | policy->cached_target_freq = UINT_MAX; |
2622 | ||
2d06d8c4 | 2623 | pr_debug("new min and max freqs are %u - %u kHz\n", |
e837f9b5 | 2624 | policy->min, policy->max); |
1da177e4 | 2625 | |
1c3d85dd | 2626 | if (cpufreq_driver->setpolicy) { |
1e4f63ae | 2627 | policy->policy = new_pol; |
2d06d8c4 | 2628 | pr_debug("setting range\n"); |
167a38dc | 2629 | return cpufreq_driver->setpolicy(policy); |
d9a789c7 | 2630 | } |
1da177e4 | 2631 | |
1e4f63ae | 2632 | if (new_gov == policy->governor) { |
2bb4059e | 2633 | pr_debug("governor limits update\n"); |
a92604b4 | 2634 | cpufreq_governor_limits(policy); |
d6ff44d6 | 2635 | return 0; |
0a300767 | 2636 | } |
7bd353a9 | 2637 | |
d9a789c7 RW |
2638 | pr_debug("governor switch\n"); |
2639 | ||
2640 | /* save old, working values */ | |
2641 | old_gov = policy->governor; | |
2642 | /* end old governor */ | |
2643 | if (old_gov) { | |
45482c70 | 2644 | cpufreq_stop_governor(policy); |
36be3418 | 2645 | cpufreq_exit_governor(policy); |
1da177e4 LT |
2646 | } |
2647 | ||
d9a789c7 | 2648 | /* start new governor */ |
1e4f63ae | 2649 | policy->governor = new_gov; |
a92604b4 | 2650 | ret = cpufreq_init_governor(policy); |
4bc384ae | 2651 | if (!ret) { |
0a300767 RW |
2652 | ret = cpufreq_start_governor(policy); |
2653 | if (!ret) { | |
2bb4059e | 2654 | pr_debug("governor change\n"); |
0a300767 RW |
2655 | return 0; |
2656 | } | |
b7898fda | 2657 | cpufreq_exit_governor(policy); |
d9a789c7 RW |
2658 | } |
2659 | ||
2660 | /* new governor failed, so re-start old one */ | |
2661 | pr_debug("starting governor %s failed\n", policy->governor->name); | |
2662 | if (old_gov) { | |
2663 | policy->governor = old_gov; | |
a92604b4 | 2664 | if (cpufreq_init_governor(policy)) |
4bc384ae VK |
2665 | policy->governor = NULL; |
2666 | else | |
0a300767 | 2667 | cpufreq_start_governor(policy); |
d9a789c7 RW |
2668 | } |
2669 | ||
4bc384ae | 2670 | return ret; |
1da177e4 LT |
2671 | } |
2672 | ||
1da177e4 | 2673 | /** |
a0dbb819 RW |
2674 | * cpufreq_update_policy - Re-evaluate an existing cpufreq policy. |
2675 | * @cpu: CPU to re-evaluate the policy for. | |
1da177e4 | 2676 | * |
a0dbb819 | 2677 | * Update the current frequency for the cpufreq policy of @cpu and use |
18c49926 VK |
2678 | * cpufreq_set_policy() to re-apply the min and max limits, which triggers the |
2679 | * evaluation of policy notifiers and the cpufreq driver's ->verify() callback | |
2680 | * for the policy in question, among other things. | |
1da177e4 | 2681 | */ |
30248fef | 2682 | void cpufreq_update_policy(unsigned int cpu) |
1da177e4 | 2683 | { |
540a3758 | 2684 | struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu); |
1da177e4 | 2685 | |
fefa8ff8 | 2686 | if (!policy) |
30248fef | 2687 | return; |
1da177e4 | 2688 | |
bb176f7d VK |
2689 | /* |
2690 | * BIOS might change freq behind our back | |
2691 | * -> ask driver for current freq and notify governors about a change | |
2692 | */ | |
5ddc6d4e | 2693 | if (cpufreq_driver->get && has_target() && |
5980752e | 2694 | (cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false)))) |
348a2ec5 | 2695 | goto unlock; |
30248fef | 2696 | |
70a59fde | 2697 | refresh_frequency_limits(policy); |
1da177e4 | 2698 | |
fefa8ff8 | 2699 | unlock: |
540a3758 | 2700 | cpufreq_cpu_release(policy); |
1da177e4 LT |
2701 | } |
2702 | EXPORT_SYMBOL(cpufreq_update_policy); | |
2703 | ||
5a25e3f7 RW |
2704 | /** |
2705 | * cpufreq_update_limits - Update policy limits for a given CPU. | |
2706 | * @cpu: CPU to update the policy limits for. | |
2707 | * | |
2708 | * Invoke the driver's ->update_limits callback if present or call | |
2709 | * cpufreq_update_policy() for @cpu. | |
2710 | */ | |
2711 | void cpufreq_update_limits(unsigned int cpu) | |
2712 | { | |
2713 | if (cpufreq_driver->update_limits) | |
2714 | cpufreq_driver->update_limits(cpu); | |
2715 | else | |
2716 | cpufreq_update_policy(cpu); | |
2717 | } | |
2718 | EXPORT_SYMBOL_GPL(cpufreq_update_limits); | |
2719 | ||
6f19efc0 LM |
2720 | /********************************************************************* |
2721 | * BOOST * | |
2722 | *********************************************************************/ | |
cf6fada7 | 2723 | static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state) |
6f19efc0 | 2724 | { |
cf6fada7 | 2725 | int ret; |
49f18560 | 2726 | |
cf6fada7 XW |
2727 | if (!policy->freq_table) |
2728 | return -ENXIO; | |
f8bfc116 | 2729 | |
cf6fada7 XW |
2730 | ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table); |
2731 | if (ret) { | |
2732 | pr_err("%s: Policy frequency update failed\n", __func__); | |
2733 | return ret; | |
6f19efc0 LM |
2734 | } |
2735 | ||
cf6fada7 XW |
2736 | ret = freq_qos_update_request(policy->max_freq_req, policy->max); |
2737 | if (ret < 0) | |
2738 | return ret; | |
2739 | ||
552abb88 | 2740 | return 0; |
6f19efc0 LM |
2741 | } |
2742 | ||
2743 | int cpufreq_boost_trigger_state(int state) | |
2744 | { | |
cf6fada7 | 2745 | struct cpufreq_policy *policy; |
6f19efc0 LM |
2746 | unsigned long flags; |
2747 | int ret = 0; | |
2748 | ||
2749 | if (cpufreq_driver->boost_enabled == state) | |
2750 | return 0; | |
2751 | ||
2752 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2753 | cpufreq_driver->boost_enabled = state; | |
2754 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2755 | ||
09681a07 | 2756 | cpus_read_lock(); |
cf6fada7 XW |
2757 | for_each_active_policy(policy) { |
2758 | ret = cpufreq_driver->set_boost(policy, state); | |
2759 | if (ret) | |
2760 | goto err_reset_state; | |
218a06a7 JZ |
2761 | |
2762 | policy->boost_enabled = state; | |
6f19efc0 | 2763 | } |
09681a07 | 2764 | cpus_read_unlock(); |
cf6fada7 XW |
2765 | |
2766 | return 0; | |
2767 | ||
2768 | err_reset_state: | |
09681a07 | 2769 | cpus_read_unlock(); |
cf6fada7 XW |
2770 | |
2771 | write_lock_irqsave(&cpufreq_driver_lock, flags); | |
2772 | cpufreq_driver->boost_enabled = !state; | |
2773 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); | |
2774 | ||
2775 | pr_err("%s: Cannot %s BOOST\n", | |
2776 | __func__, state ? "enable" : "disable"); | |
6f19efc0 LM |
2777 | |
2778 | return ret; | |
2779 | } | |
2780 | ||
41669da0 | 2781 | static bool cpufreq_boost_supported(void) |
6f19efc0 | 2782 | { |
89f98d7e | 2783 | return cpufreq_driver->set_boost; |
6f19efc0 | 2784 | } |
6f19efc0 | 2785 | |
44139ed4 VK |
2786 | static int create_boost_sysfs_file(void) |
2787 | { | |
2788 | int ret; | |
2789 | ||
c82bd444 | 2790 | ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr); |
44139ed4 VK |
2791 | if (ret) |
2792 | pr_err("%s: cannot register global BOOST sysfs file\n", | |
2793 | __func__); | |
2794 | ||
2795 | return ret; | |
2796 | } | |
2797 | ||
2798 | static void remove_boost_sysfs_file(void) | |
2799 | { | |
2800 | if (cpufreq_boost_supported()) | |
c82bd444 | 2801 | sysfs_remove_file(cpufreq_global_kobject, &boost.attr); |
44139ed4 VK |
2802 | } |
2803 | ||
2804 | int cpufreq_enable_boost_support(void) | |
2805 | { | |
2806 | if (!cpufreq_driver) | |
2807 | return -EINVAL; | |
2808 | ||
2809 | if (cpufreq_boost_supported()) | |
2810 | return 0; | |
2811 | ||
7a6c79f2 | 2812 | cpufreq_driver->set_boost = cpufreq_boost_set_sw; |
44139ed4 VK |
2813 | |
2814 | /* This will get removed on driver unregister */ | |
2815 | return create_boost_sysfs_file(); | |
2816 | } | |
2817 | EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support); | |
2818 | ||
6f19efc0 LM |
2819 | int cpufreq_boost_enabled(void) |
2820 | { | |
2821 | return cpufreq_driver->boost_enabled; | |
2822 | } | |
2823 | EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); | |
2824 | ||
1da177e4 LT |
2825 | /********************************************************************* |
2826 | * REGISTER / UNREGISTER CPUFREQ DRIVER * | |
2827 | *********************************************************************/ | |
27622b06 | 2828 | static enum cpuhp_state hp_online; |
1da177e4 | 2829 | |
c4a3fa26 CY |
2830 | static int cpuhp_cpufreq_online(unsigned int cpu) |
2831 | { | |
2832 | cpufreq_online(cpu); | |
2833 | ||
2834 | return 0; | |
2835 | } | |
2836 | ||
2837 | static int cpuhp_cpufreq_offline(unsigned int cpu) | |
2838 | { | |
2839 | cpufreq_offline(cpu); | |
2840 | ||
2841 | return 0; | |
2842 | } | |
2843 | ||
1da177e4 LT |
2844 | /** |
2845 | * cpufreq_register_driver - register a CPU Frequency driver | |
2846 | * @driver_data: A struct cpufreq_driver containing the values# | |
2847 | * submitted by the CPU Frequency driver. | |
2848 | * | |
bb176f7d | 2849 | * Registers a CPU Frequency driver to this core code. This code |
63af4055 | 2850 | * returns zero on success, -EEXIST when another driver got here first |
32ee8c3e | 2851 | * (and isn't unregistered in the meantime). |
1da177e4 LT |
2852 | * |
2853 | */ | |
221dee28 | 2854 | int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
1da177e4 LT |
2855 | { |
2856 | unsigned long flags; | |
2857 | int ret; | |
2858 | ||
a7b422cd KRW |
2859 | if (cpufreq_disabled()) |
2860 | return -ENODEV; | |
2861 | ||
46770be0 VK |
2862 | /* |
2863 | * The cpufreq core depends heavily on the availability of device | |
2864 | * structure, make sure they are available before proceeding further. | |
2865 | */ | |
2866 | if (!get_cpu_device(0)) | |
2867 | return -EPROBE_DEFER; | |
2868 | ||
1da177e4 | 2869 | if (!driver_data || !driver_data->verify || !driver_data->init || |
9c0ebcf7 | 2870 | !(driver_data->setpolicy || driver_data->target_index || |
9832235f RW |
2871 | driver_data->target) || |
2872 | (driver_data->setpolicy && (driver_data->target_index || | |
1c03a2d0 | 2873 | driver_data->target)) || |
a9a22b57 | 2874 | (!driver_data->get_intermediate != !driver_data->target_intermediate) || |
b4a11fa3 WK |
2875 | (!driver_data->online != !driver_data->offline) || |
2876 | (driver_data->adjust_perf && !driver_data->fast_switch)) | |
1da177e4 LT |
2877 | return -EINVAL; |
2878 | ||
2d06d8c4 | 2879 | pr_debug("trying to register driver %s\n", driver_data->name); |
1da177e4 | 2880 | |
fdd320da | 2881 | /* Protect against concurrent CPU online/offline. */ |
a92551e4 | 2882 | cpus_read_lock(); |
fdd320da | 2883 | |
0d1857a1 | 2884 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2885 | if (cpufreq_driver) { |
0d1857a1 | 2886 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
fdd320da RW |
2887 | ret = -EEXIST; |
2888 | goto out; | |
1da177e4 | 2889 | } |
1c3d85dd | 2890 | cpufreq_driver = driver_data; |
0d1857a1 | 2891 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
1da177e4 | 2892 | |
874f6353 IV |
2893 | /* |
2894 | * Mark support for the scheduler's frequency invariance engine for | |
2895 | * drivers that implement target(), target_index() or fast_switch(). | |
2896 | */ | |
2897 | if (!cpufreq_driver->setpolicy) { | |
2898 | static_branch_enable_cpuslocked(&cpufreq_freq_invariance); | |
2899 | pr_debug("supports frequency invariance"); | |
2900 | } | |
2901 | ||
bc68b7df VK |
2902 | if (driver_data->setpolicy) |
2903 | driver_data->flags |= CPUFREQ_CONST_LOOPS; | |
2904 | ||
7a6c79f2 RW |
2905 | if (cpufreq_boost_supported()) { |
2906 | ret = create_boost_sysfs_file(); | |
2907 | if (ret) | |
2908 | goto err_null_driver; | |
2909 | } | |
6f19efc0 | 2910 | |
8a25a2fd | 2911 | ret = subsys_interface_register(&cpufreq_interface); |
8f5bc2ab | 2912 | if (ret) |
6f19efc0 | 2913 | goto err_boost_unreg; |
1da177e4 | 2914 | |
5ae4a4b4 | 2915 | if (unlikely(list_empty(&cpufreq_policy_list))) { |
1da177e4 | 2916 | /* if all ->init() calls failed, unregister */ |
6c770036 | 2917 | ret = -ENODEV; |
ce1bcfe9 VK |
2918 | pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
2919 | driver_data->name); | |
2920 | goto err_if_unreg; | |
1da177e4 LT |
2921 | } |
2922 | ||
a92551e4 SAS |
2923 | ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, |
2924 | "cpufreq:online", | |
2925 | cpuhp_cpufreq_online, | |
2926 | cpuhp_cpufreq_offline); | |
27622b06 SAS |
2927 | if (ret < 0) |
2928 | goto err_if_unreg; | |
2929 | hp_online = ret; | |
5372e054 | 2930 | ret = 0; |
27622b06 | 2931 | |
2d06d8c4 | 2932 | pr_debug("driver %s up and running\n", driver_data->name); |
3834abb4 | 2933 | goto out; |
fdd320da | 2934 | |
8a25a2fd KS |
2935 | err_if_unreg: |
2936 | subsys_interface_unregister(&cpufreq_interface); | |
6f19efc0 | 2937 | err_boost_unreg: |
44139ed4 | 2938 | remove_boost_sysfs_file(); |
8f5bc2ab | 2939 | err_null_driver: |
0d1857a1 | 2940 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
1c3d85dd | 2941 | cpufreq_driver = NULL; |
0d1857a1 | 2942 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
3834abb4 | 2943 | out: |
a92551e4 | 2944 | cpus_read_unlock(); |
3834abb4 | 2945 | return ret; |
1da177e4 LT |
2946 | } |
2947 | EXPORT_SYMBOL_GPL(cpufreq_register_driver); | |
2948 | ||
a9909c21 | 2949 | /* |
1da177e4 LT |
2950 | * cpufreq_unregister_driver - unregister the current CPUFreq driver |
2951 | * | |
bb176f7d | 2952 | * Unregister the current CPUFreq driver. Only call this if you have |
1da177e4 LT |
2953 | * the right to do so, i.e. if you have succeeded in initialising before! |
2954 | * Returns zero if successful, and -EINVAL if the cpufreq_driver is | |
2955 | * currently not initialised. | |
2956 | */ | |
dd329e1e | 2957 | void cpufreq_unregister_driver(struct cpufreq_driver *driver) |
1da177e4 LT |
2958 | { |
2959 | unsigned long flags; | |
2960 | ||
dd329e1e UKK |
2961 | if (WARN_ON(!cpufreq_driver || (driver != cpufreq_driver))) |
2962 | return; | |
1da177e4 | 2963 | |
2d06d8c4 | 2964 | pr_debug("unregistering driver %s\n", driver->name); |
1da177e4 | 2965 | |
454d3a25 | 2966 | /* Protect against concurrent cpu hotplug */ |
a92551e4 | 2967 | cpus_read_lock(); |
8a25a2fd | 2968 | subsys_interface_unregister(&cpufreq_interface); |
44139ed4 | 2969 | remove_boost_sysfs_file(); |
874f6353 | 2970 | static_branch_disable_cpuslocked(&cpufreq_freq_invariance); |
a92551e4 | 2971 | cpuhp_remove_state_nocalls_cpuslocked(hp_online); |
1da177e4 | 2972 | |
0d1857a1 | 2973 | write_lock_irqsave(&cpufreq_driver_lock, flags); |
6eed9404 | 2974 | |
1c3d85dd | 2975 | cpufreq_driver = NULL; |
6eed9404 | 2976 | |
0d1857a1 | 2977 | write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
a92551e4 | 2978 | cpus_read_unlock(); |
1da177e4 LT |
2979 | } |
2980 | EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); | |
5a01f2e8 VP |
2981 | |
2982 | static int __init cpufreq_core_init(void) | |
2983 | { | |
8412b456 | 2984 | struct cpufreq_governor *gov = cpufreq_default_governor(); |
2744a63c | 2985 | struct device *dev_root; |
8412b456 | 2986 | |
a7b422cd KRW |
2987 | if (cpufreq_disabled()) |
2988 | return -ENODEV; | |
2989 | ||
2744a63c GKH |
2990 | dev_root = bus_get_dev_root(&cpu_subsys); |
2991 | if (dev_root) { | |
2992 | cpufreq_global_kobject = kobject_create_and_add("cpufreq", &dev_root->kobj); | |
2993 | put_device(dev_root); | |
2994 | } | |
8aa84ad8 TR |
2995 | BUG_ON(!cpufreq_global_kobject); |
2996 | ||
8412b456 | 2997 | if (!strlen(default_governor)) |
0faf84ca | 2998 | strscpy(default_governor, gov->name, CPUFREQ_NAME_LEN); |
8412b456 | 2999 | |
5a01f2e8 VP |
3000 | return 0; |
3001 | } | |
d82f2692 | 3002 | module_param(off, int, 0444); |
8412b456 | 3003 | module_param_string(default_governor, default_governor, CPUFREQ_NAME_LEN, 0444); |
5a01f2e8 | 3004 | core_initcall(cpufreq_core_init); |