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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a3c98b8b MH |
2 | /* |
3 | * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework | |
4 | * for Non-CPU Devices. | |
5 | * | |
6 | * Copyright (C) 2011 Samsung Electronics | |
7 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
a3c98b8b MH |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
23c7b54c | 11 | #include <linux/kmod.h> |
a3c98b8b | 12 | #include <linux/sched.h> |
490a421b | 13 | #include <linux/debugfs.h> |
1224451b | 14 | #include <linux/devfreq_cooling.h> |
a3c98b8b MH |
15 | #include <linux/errno.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/init.h> | |
417dc4bb | 18 | #include <linux/export.h> |
a3c98b8b | 19 | #include <linux/slab.h> |
952f6d13 | 20 | #include <linux/stat.h> |
e4db1c74 | 21 | #include <linux/pm_opp.h> |
a3c98b8b MH |
22 | #include <linux/devfreq.h> |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/printk.h> | |
27 | #include <linux/hrtimer.h> | |
8f510aeb | 28 | #include <linux/of.h> |
05d7ae15 | 29 | #include <linux/pm_qos.h> |
a3c98b8b MH |
30 | #include "governor.h" |
31 | ||
cf451adf LL |
32 | #define CREATE_TRACE_POINTS |
33 | #include <trace/events/devfreq.h> | |
34 | ||
0dd25a0d | 35 | #define IS_SUPPORTED_FLAG(f, name) ((f & DEVFREQ_GOV_FLAG_##name) ? true : false) |
5f1a9066 | 36 | #define IS_SUPPORTED_ATTR(f, name) ((f & DEVFREQ_GOV_ATTR_##name) ? true : false) |
05d7ae15 LC |
37 | #define HZ_PER_KHZ 1000 |
38 | ||
1a1357ea | 39 | static struct class *devfreq_class; |
490a421b | 40 | static struct dentry *devfreq_debugfs; |
a3c98b8b MH |
41 | |
42 | /* | |
7e6fdd4b RV |
43 | * devfreq core provides delayed work based load monitoring helper |
44 | * functions. Governors can use these or can implement their own | |
45 | * monitoring mechanism. | |
a3c98b8b | 46 | */ |
a3c98b8b | 47 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 48 | |
3aa173b8 NM |
49 | /* The list of all device-devfreq governors */ |
50 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
51 | /* The list of all device-devfreq */ |
52 | static LIST_HEAD(devfreq_list); | |
53 | static DEFINE_MUTEX(devfreq_list_lock); | |
54 | ||
4dc3bab8 CC |
55 | static const char timer_name[][DEVFREQ_NAME_LEN] = { |
56 | [DEVFREQ_TIMER_DEFERRABLE] = { "deferrable" }, | |
57 | [DEVFREQ_TIMER_DELAYED] = { "delayed" }, | |
58 | }; | |
59 | ||
a3c98b8b MH |
60 | /** |
61 | * find_device_devfreq() - find devfreq struct using device pointer | |
62 | * @dev: device pointer used to lookup device devfreq. | |
63 | * | |
64 | * Search the list of device devfreqs and return the matched device's | |
65 | * devfreq info. devfreq_list_lock should be held by the caller. | |
66 | */ | |
67 | static struct devfreq *find_device_devfreq(struct device *dev) | |
68 | { | |
69 | struct devfreq *tmp_devfreq; | |
70 | ||
8fc0e48e KK |
71 | lockdep_assert_held(&devfreq_list_lock); |
72 | ||
9348da2f | 73 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
74 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
75 | return ERR_PTR(-EINVAL); | |
76 | } | |
a3c98b8b MH |
77 | |
78 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
79 | if (tmp_devfreq->dev.parent == dev) | |
80 | return tmp_devfreq; | |
81 | } | |
82 | ||
83 | return ERR_PTR(-ENODEV); | |
84 | } | |
85 | ||
ab8f58ad CC |
86 | static unsigned long find_available_min_freq(struct devfreq *devfreq) |
87 | { | |
88 | struct dev_pm_opp *opp; | |
89 | unsigned long min_freq = 0; | |
90 | ||
91 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); | |
92 | if (IS_ERR(opp)) | |
93 | min_freq = 0; | |
94 | else | |
95 | dev_pm_opp_put(opp); | |
96 | ||
97 | return min_freq; | |
98 | } | |
99 | ||
100 | static unsigned long find_available_max_freq(struct devfreq *devfreq) | |
101 | { | |
102 | struct dev_pm_opp *opp; | |
103 | unsigned long max_freq = ULONG_MAX; | |
104 | ||
105 | opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); | |
106 | if (IS_ERR(opp)) | |
107 | max_freq = 0; | |
108 | else | |
109 | dev_pm_opp_put(opp); | |
110 | ||
111 | return max_freq; | |
112 | } | |
113 | ||
46cecc0b LC |
114 | /** |
115 | * get_freq_range() - Get the current freq range | |
116 | * @devfreq: the devfreq instance | |
117 | * @min_freq: the min frequency | |
118 | * @max_freq: the max frequency | |
119 | * | |
120 | * This takes into consideration all constraints. | |
121 | */ | |
122 | static void get_freq_range(struct devfreq *devfreq, | |
123 | unsigned long *min_freq, | |
124 | unsigned long *max_freq) | |
125 | { | |
126 | unsigned long *freq_table = devfreq->profile->freq_table; | |
05d7ae15 | 127 | s32 qos_min_freq, qos_max_freq; |
46cecc0b LC |
128 | |
129 | lockdep_assert_held(&devfreq->lock); | |
130 | ||
131 | /* | |
132 | * Initialize minimum/maximum frequency from freq table. | |
133 | * The devfreq drivers can initialize this in either ascending or | |
134 | * descending order and devfreq core supports both. | |
135 | */ | |
136 | if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { | |
137 | *min_freq = freq_table[0]; | |
138 | *max_freq = freq_table[devfreq->profile->max_state - 1]; | |
139 | } else { | |
140 | *min_freq = freq_table[devfreq->profile->max_state - 1]; | |
141 | *max_freq = freq_table[0]; | |
142 | } | |
143 | ||
05d7ae15 LC |
144 | /* Apply constraints from PM QoS */ |
145 | qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
146 | DEV_PM_QOS_MIN_FREQUENCY); | |
147 | qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
148 | DEV_PM_QOS_MAX_FREQUENCY); | |
149 | *min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq); | |
150 | if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE) | |
151 | *max_freq = min(*max_freq, | |
152 | (unsigned long)HZ_PER_KHZ * qos_max_freq); | |
153 | ||
46cecc0b LC |
154 | /* Apply constraints from OPP interface */ |
155 | *min_freq = max(*min_freq, devfreq->scaling_min_freq); | |
156 | *max_freq = min(*max_freq, devfreq->scaling_max_freq); | |
157 | ||
158 | if (*min_freq > *max_freq) | |
159 | *min_freq = *max_freq; | |
160 | } | |
161 | ||
e552bbaf JL |
162 | /** |
163 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
164 | * @devfreq: the devfreq instance | |
165 | * @freq: the target frequency | |
166 | */ | |
167 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
168 | { | |
169 | int lev; | |
170 | ||
171 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
172 | if (freq == devfreq->profile->freq_table[lev]) | |
173 | return lev; | |
174 | ||
175 | return -EINVAL; | |
176 | } | |
177 | ||
ea572f81 | 178 | static int set_freq_table(struct devfreq *devfreq) |
0ec09ac2 CC |
179 | { |
180 | struct devfreq_dev_profile *profile = devfreq->profile; | |
181 | struct dev_pm_opp *opp; | |
182 | unsigned long freq; | |
183 | int i, count; | |
184 | ||
185 | /* Initialize the freq_table from OPP table */ | |
186 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
187 | if (count <= 0) | |
ea572f81 | 188 | return -EINVAL; |
0ec09ac2 CC |
189 | |
190 | profile->max_state = count; | |
191 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
192 | profile->max_state, | |
193 | sizeof(*profile->freq_table), | |
194 | GFP_KERNEL); | |
195 | if (!profile->freq_table) { | |
196 | profile->max_state = 0; | |
ea572f81 | 197 | return -ENOMEM; |
0ec09ac2 CC |
198 | } |
199 | ||
0ec09ac2 CC |
200 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { |
201 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
202 | if (IS_ERR(opp)) { | |
203 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
204 | profile->max_state = 0; | |
ea572f81 | 205 | return PTR_ERR(opp); |
0ec09ac2 | 206 | } |
8a31d9d9 | 207 | dev_pm_opp_put(opp); |
0ec09ac2 CC |
208 | profile->freq_table[i] = freq; |
209 | } | |
ea572f81 CC |
210 | |
211 | return 0; | |
0ec09ac2 CC |
212 | } |
213 | ||
e552bbaf JL |
214 | /** |
215 | * devfreq_update_status() - Update statistics of devfreq behavior | |
216 | * @devfreq: the devfreq instance | |
217 | * @freq: the update target frequency | |
218 | */ | |
30582c25 | 219 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 220 | { |
e35d35a1 | 221 | int lev, prev_lev, ret = 0; |
b76b3479 | 222 | u64 cur_time; |
e552bbaf | 223 | |
2abb0d52 | 224 | lockdep_assert_held(&devfreq->lock); |
b76b3479 | 225 | cur_time = get_jiffies_64(); |
e35d35a1 | 226 | |
d0563a03 TJ |
227 | /* Immediately exit if previous_freq is not initialized yet. */ |
228 | if (!devfreq->previous_freq) | |
229 | goto out; | |
230 | ||
e35d35a1 SK |
231 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
232 | if (prev_lev < 0) { | |
233 | ret = prev_lev; | |
234 | goto out; | |
235 | } | |
236 | ||
1ebd0bc0 KK |
237 | devfreq->stats.time_in_state[prev_lev] += |
238 | cur_time - devfreq->stats.last_update; | |
e35d35a1 SK |
239 | |
240 | lev = devfreq_get_freq_level(devfreq, freq); | |
241 | if (lev < 0) { | |
242 | ret = lev; | |
243 | goto out; | |
244 | } | |
245 | ||
246 | if (lev != prev_lev) { | |
1ebd0bc0 KK |
247 | devfreq->stats.trans_table[ |
248 | (prev_lev * devfreq->profile->max_state) + lev]++; | |
249 | devfreq->stats.total_trans++; | |
e552bbaf | 250 | } |
e552bbaf | 251 | |
e35d35a1 | 252 | out: |
1ebd0bc0 | 253 | devfreq->stats.last_update = cur_time; |
e35d35a1 | 254 | return ret; |
e552bbaf | 255 | } |
30582c25 | 256 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 257 | |
3aa173b8 NM |
258 | /** |
259 | * find_devfreq_governor() - find devfreq governor from name | |
260 | * @name: name of the governor | |
261 | * | |
262 | * Search the list of devfreq governors and return the matched | |
263 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
264 | */ | |
265 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
266 | { | |
267 | struct devfreq_governor *tmp_governor; | |
268 | ||
8fc0e48e KK |
269 | lockdep_assert_held(&devfreq_list_lock); |
270 | ||
9348da2f | 271 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
272 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
273 | return ERR_PTR(-EINVAL); | |
274 | } | |
3aa173b8 NM |
275 | |
276 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
277 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
278 | return tmp_governor; | |
279 | } | |
280 | ||
281 | return ERR_PTR(-ENODEV); | |
282 | } | |
283 | ||
23c7b54c EBS |
284 | /** |
285 | * try_then_request_governor() - Try to find the governor and request the | |
286 | * module if is not found. | |
287 | * @name: name of the governor | |
288 | * | |
289 | * Search the list of devfreq governors and request the module and try again | |
290 | * if is not found. This can happen when both drivers (the governor driver | |
291 | * and the driver that call devfreq_add_device) are built as modules. | |
292 | * devfreq_list_lock should be held by the caller. Returns the matched | |
b53b0128 | 293 | * governor's pointer or an error pointer. |
23c7b54c EBS |
294 | */ |
295 | static struct devfreq_governor *try_then_request_governor(const char *name) | |
296 | { | |
297 | struct devfreq_governor *governor; | |
298 | int err = 0; | |
299 | ||
8fc0e48e KK |
300 | lockdep_assert_held(&devfreq_list_lock); |
301 | ||
23c7b54c EBS |
302 | if (IS_ERR_OR_NULL(name)) { |
303 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); | |
304 | return ERR_PTR(-EINVAL); | |
305 | } | |
23c7b54c EBS |
306 | |
307 | governor = find_devfreq_governor(name); | |
308 | if (IS_ERR(governor)) { | |
309 | mutex_unlock(&devfreq_list_lock); | |
310 | ||
311 | if (!strncmp(name, DEVFREQ_GOV_SIMPLE_ONDEMAND, | |
312 | DEVFREQ_NAME_LEN)) | |
313 | err = request_module("governor_%s", "simpleondemand"); | |
314 | else | |
315 | err = request_module("governor_%s", name); | |
316 | /* Restore previous state before return */ | |
317 | mutex_lock(&devfreq_list_lock); | |
318 | if (err) | |
7544fd7f | 319 | return (err < 0) ? ERR_PTR(err) : ERR_PTR(-EINVAL); |
23c7b54c EBS |
320 | |
321 | governor = find_devfreq_governor(name); | |
322 | } | |
323 | ||
324 | return governor; | |
325 | } | |
326 | ||
0fe3a664 CC |
327 | static int devfreq_notify_transition(struct devfreq *devfreq, |
328 | struct devfreq_freqs *freqs, unsigned int state) | |
329 | { | |
330 | if (!devfreq) | |
331 | return -EINVAL; | |
332 | ||
333 | switch (state) { | |
334 | case DEVFREQ_PRECHANGE: | |
335 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
336 | DEVFREQ_PRECHANGE, freqs); | |
337 | break; | |
338 | ||
339 | case DEVFREQ_POSTCHANGE: | |
340 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
341 | DEVFREQ_POSTCHANGE, freqs); | |
342 | break; | |
343 | default: | |
344 | return -EINVAL; | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
63314172 LL |
350 | static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, |
351 | u32 flags) | |
352 | { | |
353 | struct devfreq_freqs freqs; | |
354 | unsigned long cur_freq; | |
355 | int err = 0; | |
356 | ||
357 | if (devfreq->profile->get_cur_freq) | |
358 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
359 | else | |
360 | cur_freq = devfreq->previous_freq; | |
361 | ||
362 | freqs.old = cur_freq; | |
363 | freqs.new = new_freq; | |
364 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
365 | ||
366 | err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); | |
367 | if (err) { | |
368 | freqs.new = cur_freq; | |
369 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
370 | return err; | |
371 | } | |
372 | ||
cab477d0 MK |
373 | /* |
374 | * Print devfreq_frequency trace information between DEVFREQ_PRECHANGE | |
375 | * and DEVFREQ_POSTCHANGE because for showing the correct frequency | |
376 | * change order of between devfreq device and passive devfreq device. | |
377 | */ | |
378 | if (trace_devfreq_frequency_enabled() && new_freq != cur_freq) | |
379 | trace_devfreq_frequency(devfreq, new_freq, cur_freq); | |
380 | ||
63314172 LL |
381 | freqs.new = new_freq; |
382 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
383 | ||
384 | if (devfreq_update_status(devfreq, new_freq)) | |
385 | dev_err(&devfreq->dev, | |
386 | "Couldn't update frequency transition information.\n"); | |
387 | ||
388 | devfreq->previous_freq = new_freq; | |
83f8ca45 LL |
389 | |
390 | if (devfreq->suspend_freq) | |
391 | devfreq->resume_freq = cur_freq; | |
392 | ||
63314172 LL |
393 | return err; |
394 | } | |
395 | ||
a3c98b8b | 396 | /** |
b4365423 CC |
397 | * devfreq_update_target() - Reevaluate the device and configure frequency |
398 | * on the final stage. | |
a3c98b8b | 399 | * @devfreq: the devfreq instance. |
b4365423 CC |
400 | * @freq: the new frequency of parent device. This argument |
401 | * is only used for devfreq device using passive governor. | |
a3c98b8b | 402 | * |
b4365423 CC |
403 | * Note: Lock devfreq->lock before calling devfreq_update_target. This function |
404 | * should be only used by both update_devfreq() and devfreq governors. | |
a3c98b8b | 405 | */ |
b4365423 | 406 | int devfreq_update_target(struct devfreq *devfreq, unsigned long freq) |
a3c98b8b | 407 | { |
b4365423 | 408 | unsigned long min_freq, max_freq; |
a3c98b8b | 409 | int err = 0; |
ab5f299f | 410 | u32 flags = 0; |
a3c98b8b | 411 | |
8fc0e48e | 412 | lockdep_assert_held(&devfreq->lock); |
a3c98b8b | 413 | |
1b5c1be2 NM |
414 | if (!devfreq->governor) |
415 | return -EINVAL; | |
416 | ||
a3c98b8b MH |
417 | /* Reevaluate the proper frequency */ |
418 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
419 | if (err) | |
420 | return err; | |
46cecc0b | 421 | get_freq_range(devfreq, &min_freq, &max_freq); |
ab5f299f | 422 | |
df5cf4a3 | 423 | if (freq < min_freq) { |
f1d981ea | 424 | freq = min_freq; |
ab5f299f MH |
425 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ |
426 | } | |
df5cf4a3 | 427 | if (freq > max_freq) { |
f1d981ea | 428 | freq = max_freq; |
ab5f299f MH |
429 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ |
430 | } | |
431 | ||
63314172 | 432 | return devfreq_set_target(devfreq, freq, flags); |
b4365423 CC |
433 | } |
434 | EXPORT_SYMBOL(devfreq_update_target); | |
435 | ||
436 | /* Load monitoring helper functions for governors use */ | |
0fe3a664 | 437 | |
b4365423 CC |
438 | /** |
439 | * update_devfreq() - Reevaluate the device and configure frequency. | |
440 | * @devfreq: the devfreq instance. | |
441 | * | |
442 | * Note: Lock devfreq->lock before calling update_devfreq | |
443 | * This function is exported for governors. | |
444 | */ | |
445 | int update_devfreq(struct devfreq *devfreq) | |
446 | { | |
447 | return devfreq_update_target(devfreq, 0L); | |
a3c98b8b | 448 | } |
2df5021f | 449 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 450 | |
7e6fdd4b RV |
451 | /** |
452 | * devfreq_monitor() - Periodically poll devfreq objects. | |
453 | * @work: the work struct used to run devfreq_monitor periodically. | |
454 | * | |
455 | */ | |
456 | static void devfreq_monitor(struct work_struct *work) | |
457 | { | |
458 | int err; | |
459 | struct devfreq *devfreq = container_of(work, | |
460 | struct devfreq, work.work); | |
461 | ||
462 | mutex_lock(&devfreq->lock); | |
463 | err = update_devfreq(devfreq); | |
464 | if (err) | |
465 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
466 | ||
467 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
468 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
469 | mutex_unlock(&devfreq->lock); | |
cf451adf LL |
470 | |
471 | trace_devfreq_monitor(devfreq); | |
7e6fdd4b RV |
472 | } |
473 | ||
474 | /** | |
475 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
476 | * @devfreq: the devfreq instance. | |
477 | * | |
2c090832 | 478 | * Helper function for starting devfreq device load monitoring. By |
7e6fdd4b RV |
479 | * default delayed work based monitoring is supported. Function |
480 | * to be called from governor in response to DEVFREQ_GOV_START | |
481 | * event when device is added to devfreq framework. | |
482 | */ | |
483 | void devfreq_monitor_start(struct devfreq *devfreq) | |
484 | { | |
0dd25a0d | 485 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
486 | return; |
487 | ||
4dc3bab8 CC |
488 | switch (devfreq->profile->timer) { |
489 | case DEVFREQ_TIMER_DEFERRABLE: | |
490 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
491 | break; | |
492 | case DEVFREQ_TIMER_DELAYED: | |
493 | INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); | |
494 | break; | |
495 | default: | |
496 | return; | |
497 | } | |
498 | ||
7e6fdd4b RV |
499 | if (devfreq->profile->polling_ms) |
500 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
501 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
502 | } | |
6dcdd8e3 | 503 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
504 | |
505 | /** | |
506 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
507 | * @devfreq: the devfreq instance. | |
508 | * | |
2c090832 | 509 | * Helper function to stop devfreq device load monitoring. Function |
7e6fdd4b RV |
510 | * to be called from governor in response to DEVFREQ_GOV_STOP |
511 | * event when device is removed from devfreq framework. | |
512 | */ | |
513 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
514 | { | |
0dd25a0d | 515 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
516 | return; |
517 | ||
7e6fdd4b RV |
518 | cancel_delayed_work_sync(&devfreq->work); |
519 | } | |
6dcdd8e3 | 520 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
521 | |
522 | /** | |
523 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
524 | * @devfreq: the devfreq instance. | |
525 | * | |
2c090832 | 526 | * Helper function to suspend devfreq device load monitoring. Function |
7e6fdd4b RV |
527 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND |
528 | * event or when polling interval is set to zero. | |
529 | * | |
530 | * Note: Though this function is same as devfreq_monitor_stop(), | |
531 | * intentionally kept separate to provide hooks for collecting | |
532 | * transition statistics. | |
533 | */ | |
534 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
535 | { | |
536 | mutex_lock(&devfreq->lock); | |
537 | if (devfreq->stop_polling) { | |
538 | mutex_unlock(&devfreq->lock); | |
539 | return; | |
540 | } | |
541 | ||
39688ce6 | 542 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
543 | devfreq->stop_polling = true; |
544 | mutex_unlock(&devfreq->lock); | |
5c0f6c79 | 545 | |
0dd25a0d | 546 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
547 | return; |
548 | ||
7e6fdd4b RV |
549 | cancel_delayed_work_sync(&devfreq->work); |
550 | } | |
6dcdd8e3 | 551 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
552 | |
553 | /** | |
554 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
555 | * @devfreq: the devfreq instance. | |
556 | * | |
2c090832 | 557 | * Helper function to resume devfreq device load monitoring. Function |
7e6fdd4b RV |
558 | * to be called from governor in response to DEVFREQ_GOV_RESUME |
559 | * event or when polling interval is set to non-zero. | |
560 | */ | |
561 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
562 | { | |
39688ce6 RV |
563 | unsigned long freq; |
564 | ||
7e6fdd4b | 565 | mutex_lock(&devfreq->lock); |
7e6fdd4b | 566 | |
0dd25a0d | 567 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
568 | goto out_update; |
569 | ||
0dd25a0d CC |
570 | if (!devfreq->stop_polling) |
571 | goto out; | |
572 | ||
7e6fdd4b RV |
573 | if (!delayed_work_pending(&devfreq->work) && |
574 | devfreq->profile->polling_ms) | |
575 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
576 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 | 577 | |
5c0f6c79 | 578 | out_update: |
1ebd0bc0 | 579 | devfreq->stats.last_update = get_jiffies_64(); |
7e6fdd4b RV |
580 | devfreq->stop_polling = false; |
581 | ||
39688ce6 RV |
582 | if (devfreq->profile->get_cur_freq && |
583 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
584 | devfreq->previous_freq = freq; | |
585 | ||
7e6fdd4b RV |
586 | out: |
587 | mutex_unlock(&devfreq->lock); | |
588 | } | |
6dcdd8e3 | 589 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
590 | |
591 | /** | |
3a1ec2e8 | 592 | * devfreq_update_interval() - Update device devfreq monitoring interval |
7e6fdd4b RV |
593 | * @devfreq: the devfreq instance. |
594 | * @delay: new polling interval to be set. | |
595 | * | |
596 | * Helper function to set new load monitoring polling interval. Function | |
3a1ec2e8 | 597 | * to be called from governor in response to DEVFREQ_GOV_UPDATE_INTERVAL event. |
7e6fdd4b | 598 | */ |
3a1ec2e8 | 599 | void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) |
7e6fdd4b RV |
600 | { |
601 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
602 | unsigned int new_delay = *delay; | |
603 | ||
604 | mutex_lock(&devfreq->lock); | |
605 | devfreq->profile->polling_ms = new_delay; | |
606 | ||
0dd25a0d | 607 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
7e6fdd4b RV |
608 | goto out; |
609 | ||
0dd25a0d | 610 | if (devfreq->stop_polling) |
5c0f6c79 DO |
611 | goto out; |
612 | ||
7e6fdd4b RV |
613 | /* if new delay is zero, stop polling */ |
614 | if (!new_delay) { | |
615 | mutex_unlock(&devfreq->lock); | |
616 | cancel_delayed_work_sync(&devfreq->work); | |
617 | return; | |
618 | } | |
619 | ||
620 | /* if current delay is zero, start polling with new delay */ | |
621 | if (!cur_delay) { | |
622 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
623 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
624 | goto out; | |
625 | } | |
626 | ||
627 | /* if current delay is greater than new delay, restart polling */ | |
628 | if (cur_delay > new_delay) { | |
629 | mutex_unlock(&devfreq->lock); | |
630 | cancel_delayed_work_sync(&devfreq->work); | |
631 | mutex_lock(&devfreq->lock); | |
632 | if (!devfreq->stop_polling) | |
633 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
6d690f77 | 634 | msecs_to_jiffies(devfreq->profile->polling_ms)); |
7e6fdd4b RV |
635 | } |
636 | out: | |
637 | mutex_unlock(&devfreq->lock); | |
638 | } | |
3a1ec2e8 | 639 | EXPORT_SYMBOL(devfreq_update_interval); |
a3c98b8b MH |
640 | |
641 | /** | |
642 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
6d690f77 | 643 | * has been changed out of devfreq framework. |
c5b4a1c1 NM |
644 | * @nb: the notifier_block (supposed to be devfreq->nb) |
645 | * @type: not used | |
646 | * @devp: not used | |
a3c98b8b MH |
647 | * |
648 | * Called by a notifier that uses devfreq->nb. | |
649 | */ | |
650 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
651 | void *devp) | |
652 | { | |
653 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
e876e710 | 654 | int err = -EINVAL; |
a3c98b8b MH |
655 | |
656 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
657 | |
658 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
e876e710 LC |
659 | if (!devfreq->scaling_min_freq) |
660 | goto out; | |
f1d981ea CC |
661 | |
662 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
e7cc792d LC |
663 | if (!devfreq->scaling_max_freq) { |
664 | devfreq->scaling_max_freq = ULONG_MAX; | |
e876e710 | 665 | goto out; |
e7cc792d | 666 | } |
e876e710 LC |
667 | |
668 | err = update_devfreq(devfreq); | |
f1d981ea | 669 | |
e876e710 | 670 | out: |
a3c98b8b | 671 | mutex_unlock(&devfreq->lock); |
e876e710 LC |
672 | if (err) |
673 | dev_err(devfreq->dev.parent, | |
674 | "failed to update frequency from OPP notifier (%d)\n", | |
675 | err); | |
a3c98b8b | 676 | |
e876e710 | 677 | return NOTIFY_OK; |
a3c98b8b MH |
678 | } |
679 | ||
05d7ae15 LC |
680 | /** |
681 | * qos_notifier_call() - Common handler for QoS constraints. | |
682 | * @devfreq: the devfreq instance. | |
683 | */ | |
684 | static int qos_notifier_call(struct devfreq *devfreq) | |
685 | { | |
686 | int err; | |
687 | ||
688 | mutex_lock(&devfreq->lock); | |
689 | err = update_devfreq(devfreq); | |
690 | mutex_unlock(&devfreq->lock); | |
691 | if (err) | |
692 | dev_err(devfreq->dev.parent, | |
693 | "failed to update frequency from PM QoS (%d)\n", | |
694 | err); | |
695 | ||
696 | return NOTIFY_OK; | |
697 | } | |
698 | ||
699 | /** | |
700 | * qos_min_notifier_call() - Callback for QoS min_freq changes. | |
701 | * @nb: Should be devfreq->nb_min | |
702 | */ | |
703 | static int qos_min_notifier_call(struct notifier_block *nb, | |
704 | unsigned long val, void *ptr) | |
705 | { | |
706 | return qos_notifier_call(container_of(nb, struct devfreq, nb_min)); | |
707 | } | |
708 | ||
709 | /** | |
710 | * qos_max_notifier_call() - Callback for QoS max_freq changes. | |
711 | * @nb: Should be devfreq->nb_max | |
712 | */ | |
713 | static int qos_max_notifier_call(struct notifier_block *nb, | |
714 | unsigned long val, void *ptr) | |
715 | { | |
716 | return qos_notifier_call(container_of(nb, struct devfreq, nb_max)); | |
717 | } | |
718 | ||
a3c98b8b | 719 | /** |
29b6968b CC |
720 | * devfreq_dev_release() - Callback for struct device to release the device. |
721 | * @dev: the devfreq device | |
722 | * | |
723 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 724 | */ |
29b6968b | 725 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 726 | { |
29b6968b | 727 | struct devfreq *devfreq = to_devfreq(dev); |
05d7ae15 | 728 | int err; |
29b6968b | 729 | |
7e6fdd4b | 730 | mutex_lock(&devfreq_list_lock); |
7e6fdd4b RV |
731 | list_del(&devfreq->node); |
732 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 733 | |
05d7ae15 LC |
734 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max, |
735 | DEV_PM_QOS_MAX_FREQUENCY); | |
736 | if (err && err != -ENOENT) | |
737 | dev_warn(dev->parent, | |
738 | "Failed to remove max_freq notifier: %d\n", err); | |
739 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min, | |
740 | DEV_PM_QOS_MIN_FREQUENCY); | |
741 | if (err && err != -ENOENT) | |
742 | dev_warn(dev->parent, | |
743 | "Failed to remove min_freq notifier: %d\n", err); | |
744 | ||
27dbc542 LC |
745 | if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) { |
746 | err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); | |
4c6abef7 | 747 | if (err < 0) |
27dbc542 LC |
748 | dev_warn(dev->parent, |
749 | "Failed to remove max_freq request: %d\n", err); | |
750 | } | |
751 | if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) { | |
752 | err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); | |
4c6abef7 | 753 | if (err < 0) |
27dbc542 LC |
754 | dev_warn(dev->parent, |
755 | "Failed to remove min_freq request: %d\n", err); | |
756 | } | |
757 | ||
a3c98b8b MH |
758 | if (devfreq->profile->exit) |
759 | devfreq->profile->exit(devfreq->dev.parent); | |
760 | ||
26f9c7cc SK |
761 | if (devfreq->opp_table) |
762 | dev_pm_opp_put_opp_table(devfreq->opp_table); | |
763 | ||
a3c98b8b | 764 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
765 | kfree(devfreq); |
766 | } | |
767 | ||
5f1a9066 CC |
768 | static void create_sysfs_files(struct devfreq *devfreq, |
769 | const struct devfreq_governor *gov); | |
770 | static void remove_sysfs_files(struct devfreq *devfreq, | |
771 | const struct devfreq_governor *gov); | |
772 | ||
a3c98b8b MH |
773 | /** |
774 | * devfreq_add_device() - Add devfreq feature to the device | |
775 | * @dev: the device to add devfreq feature. | |
776 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 777 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
778 | * @data: private data for the governor. The devfreq framework does not |
779 | * touch this value. | |
780 | */ | |
781 | struct devfreq *devfreq_add_device(struct device *dev, | |
782 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 783 | const char *governor_name, |
a3c98b8b MH |
784 | void *data) |
785 | { | |
786 | struct devfreq *devfreq; | |
1b5c1be2 | 787 | struct devfreq_governor *governor; |
a3c98b8b MH |
788 | int err = 0; |
789 | ||
1b5c1be2 | 790 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
791 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
792 | return ERR_PTR(-EINVAL); | |
793 | } | |
794 | ||
7e6fdd4b RV |
795 | mutex_lock(&devfreq_list_lock); |
796 | devfreq = find_device_devfreq(dev); | |
797 | mutex_unlock(&devfreq_list_lock); | |
798 | if (!IS_ERR(devfreq)) { | |
df4d7b14 | 799 | dev_err(dev, "%s: devfreq device already exists!\n", |
9d0109be | 800 | __func__); |
7e6fdd4b RV |
801 | err = -EINVAL; |
802 | goto err_out; | |
a3c98b8b MH |
803 | } |
804 | ||
805 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
806 | if (!devfreq) { | |
a3c98b8b | 807 | err = -ENOMEM; |
3f19f08a | 808 | goto err_out; |
a3c98b8b MH |
809 | } |
810 | ||
811 | mutex_init(&devfreq->lock); | |
812 | mutex_lock(&devfreq->lock); | |
813 | devfreq->dev.parent = dev; | |
814 | devfreq->dev.class = devfreq_class; | |
815 | devfreq->dev.release = devfreq_dev_release; | |
42a6b25e | 816 | INIT_LIST_HEAD(&devfreq->node); |
a3c98b8b | 817 | devfreq->profile = profile; |
a3c98b8b | 818 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 819 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 820 | devfreq->data = data; |
a3c98b8b MH |
821 | devfreq->nb.notifier_call = devfreq_notifier_call; |
822 | ||
4dc3bab8 CC |
823 | if (devfreq->profile->timer < 0 |
824 | || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { | |
825 | goto err_out; | |
826 | } | |
827 | ||
0ec09ac2 CC |
828 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
829 | mutex_unlock(&devfreq->lock); | |
ea572f81 CC |
830 | err = set_freq_table(devfreq); |
831 | if (err < 0) | |
a9487917 | 832 | goto err_dev; |
0ec09ac2 CC |
833 | mutex_lock(&devfreq->lock); |
834 | } | |
835 | ||
2c2cb1e6 MK |
836 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); |
837 | if (!devfreq->scaling_min_freq) { | |
ab8f58ad CC |
838 | mutex_unlock(&devfreq->lock); |
839 | err = -EINVAL; | |
840 | goto err_dev; | |
841 | } | |
842 | ||
2c2cb1e6 MK |
843 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); |
844 | if (!devfreq->scaling_max_freq) { | |
ab8f58ad CC |
845 | mutex_unlock(&devfreq->lock); |
846 | err = -EINVAL; | |
847 | goto err_dev; | |
848 | } | |
849 | ||
83f8ca45 | 850 | devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); |
26f9c7cc SK |
851 | devfreq->opp_table = dev_pm_opp_get_opp_table(dev); |
852 | if (IS_ERR(devfreq->opp_table)) | |
853 | devfreq->opp_table = NULL; | |
854 | ||
83f8ca45 LL |
855 | atomic_set(&devfreq->suspend_count, 0); |
856 | ||
66d0e797 | 857 | dev_set_name(&devfreq->dev, "%s", dev_name(dev)); |
a3c98b8b MH |
858 | err = device_register(&devfreq->dev); |
859 | if (err) { | |
7e6fdd4b | 860 | mutex_unlock(&devfreq->lock); |
2d803dc8 AY |
861 | put_device(&devfreq->dev); |
862 | goto err_out; | |
a3c98b8b MH |
863 | } |
864 | ||
1ebd0bc0 | 865 | devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, |
6d690f77 MH |
866 | array3_size(sizeof(unsigned int), |
867 | devfreq->profile->max_state, | |
868 | devfreq->profile->max_state), | |
869 | GFP_KERNEL); | |
1ebd0bc0 | 870 | if (!devfreq->stats.trans_table) { |
25846fa1 YL |
871 | mutex_unlock(&devfreq->lock); |
872 | err = -ENOMEM; | |
873 | goto err_devfreq; | |
874 | } | |
875 | ||
1ebd0bc0 | 876 | devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, |
6d690f77 | 877 | devfreq->profile->max_state, |
1ebd0bc0 | 878 | sizeof(*devfreq->stats.time_in_state), |
6d690f77 | 879 | GFP_KERNEL); |
1ebd0bc0 | 880 | if (!devfreq->stats.time_in_state) { |
25846fa1 YL |
881 | mutex_unlock(&devfreq->lock); |
882 | err = -ENOMEM; | |
883 | goto err_devfreq; | |
884 | } | |
885 | ||
1ebd0bc0 KK |
886 | devfreq->stats.total_trans = 0; |
887 | devfreq->stats.last_update = get_jiffies_64(); | |
3e1d7fb0 | 888 | |
0fe3a664 CC |
889 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
890 | ||
a3c98b8b MH |
891 | mutex_unlock(&devfreq->lock); |
892 | ||
27dbc542 LC |
893 | err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, |
894 | DEV_PM_QOS_MIN_FREQUENCY, 0); | |
895 | if (err < 0) | |
896 | goto err_devfreq; | |
897 | err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, | |
898 | DEV_PM_QOS_MAX_FREQUENCY, | |
899 | PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); | |
900 | if (err < 0) | |
901 | goto err_devfreq; | |
902 | ||
05d7ae15 | 903 | devfreq->nb_min.notifier_call = qos_min_notifier_call; |
ec894883 | 904 | err = dev_pm_qos_add_notifier(dev, &devfreq->nb_min, |
05d7ae15 LC |
905 | DEV_PM_QOS_MIN_FREQUENCY); |
906 | if (err) | |
907 | goto err_devfreq; | |
908 | ||
909 | devfreq->nb_max.notifier_call = qos_max_notifier_call; | |
ec894883 | 910 | err = dev_pm_qos_add_notifier(dev, &devfreq->nb_max, |
05d7ae15 LC |
911 | DEV_PM_QOS_MAX_FREQUENCY); |
912 | if (err) | |
913 | goto err_devfreq; | |
914 | ||
a3c98b8b | 915 | mutex_lock(&devfreq_list_lock); |
a3c98b8b | 916 | |
96ffcdf2 | 917 | governor = try_then_request_governor(governor_name); |
73613b16 CC |
918 | if (IS_ERR(governor)) { |
919 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
920 | __func__); | |
921 | err = PTR_ERR(governor); | |
922 | goto err_init; | |
923 | } | |
924 | ||
925 | devfreq->governor = governor; | |
926 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
927 | NULL); | |
7e6fdd4b RV |
928 | if (err) { |
929 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
930 | __func__); | |
931 | goto err_init; | |
a3c98b8b | 932 | } |
5f1a9066 | 933 | create_sysfs_files(devfreq, devfreq->governor); |
23c7b54c EBS |
934 | |
935 | list_add(&devfreq->node, &devfreq_list); | |
936 | ||
0f376c9c | 937 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 938 | |
1224451b DL |
939 | if (devfreq->profile->is_cooling_device) { |
940 | devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); | |
941 | if (IS_ERR(devfreq->cdev)) | |
942 | devfreq->cdev = NULL; | |
943 | } | |
944 | ||
3f19f08a AL |
945 | return devfreq; |
946 | ||
a3c98b8b | 947 | err_init: |
0f376c9c | 948 | mutex_unlock(&devfreq_list_lock); |
25846fa1 | 949 | err_devfreq: |
2f061fd0 | 950 | devfreq_remove_device(devfreq); |
2d803dc8 | 951 | devfreq = NULL; |
9e14de10 | 952 | err_dev: |
8188b154 | 953 | kfree(devfreq); |
3f19f08a AL |
954 | err_out: |
955 | return ERR_PTR(err); | |
a3c98b8b | 956 | } |
7e6fdd4b | 957 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
958 | |
959 | /** | |
960 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 961 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
962 | * |
963 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
964 | */ |
965 | int devfreq_remove_device(struct devfreq *devfreq) | |
966 | { | |
967 | if (!devfreq) | |
968 | return -EINVAL; | |
969 | ||
1224451b DL |
970 | devfreq_cooling_unregister(devfreq->cdev); |
971 | ||
5f1a9066 | 972 | if (devfreq->governor) { |
2f061fd0 VD |
973 | devfreq->governor->event_handler(devfreq, |
974 | DEVFREQ_GOV_STOP, NULL); | |
5f1a9066 CC |
975 | remove_sysfs_files(devfreq, devfreq->governor); |
976 | } | |
977 | ||
585fc83e | 978 | device_unregister(&devfreq->dev); |
9f3bdd4f | 979 | |
a3c98b8b MH |
980 | return 0; |
981 | } | |
7e6fdd4b | 982 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 983 | |
8cd84092 CC |
984 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
985 | { | |
986 | struct devfreq **r = res; | |
987 | ||
988 | if (WARN_ON(!r || !*r)) | |
989 | return 0; | |
990 | ||
991 | return *r == data; | |
992 | } | |
993 | ||
994 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
995 | { | |
996 | devfreq_remove_device(*(struct devfreq **)res); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
1001 | * @dev: the device to add devfreq feature. | |
1002 | * @profile: device-specific profile to run devfreq. | |
1003 | * @governor_name: name of the policy to choose frequency. | |
1004 | * @data: private data for the governor. The devfreq framework does not | |
1005 | * touch this value. | |
1006 | * | |
1007 | * This function manages automatically the memory of devfreq device using device | |
1008 | * resource management and simplify the free operation for memory of devfreq | |
1009 | * device. | |
1010 | */ | |
1011 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
1012 | struct devfreq_dev_profile *profile, | |
1013 | const char *governor_name, | |
1014 | void *data) | |
1015 | { | |
1016 | struct devfreq **ptr, *devfreq; | |
1017 | ||
1018 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
1019 | if (!ptr) | |
1020 | return ERR_PTR(-ENOMEM); | |
1021 | ||
1022 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
1023 | if (IS_ERR(devfreq)) { | |
1024 | devres_free(ptr); | |
d1bf2d30 | 1025 | return devfreq; |
8cd84092 CC |
1026 | } |
1027 | ||
1028 | *ptr = devfreq; | |
1029 | devres_add(dev, ptr); | |
1030 | ||
1031 | return devfreq; | |
1032 | } | |
1033 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
1034 | ||
8f510aeb | 1035 | #ifdef CONFIG_OF |
7b38b7b0 LC |
1036 | /* |
1037 | * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree | |
1038 | * @node - pointer to device_node | |
1039 | * | |
1040 | * return the instance of devfreq device | |
1041 | */ | |
1042 | struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) | |
1043 | { | |
1044 | struct devfreq *devfreq; | |
1045 | ||
1046 | if (!node) | |
1047 | return ERR_PTR(-EINVAL); | |
1048 | ||
1049 | mutex_lock(&devfreq_list_lock); | |
1050 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1051 | if (devfreq->dev.parent | |
1052 | && devfreq->dev.parent->of_node == node) { | |
1053 | mutex_unlock(&devfreq_list_lock); | |
1054 | return devfreq; | |
1055 | } | |
1056 | } | |
1057 | mutex_unlock(&devfreq_list_lock); | |
1058 | ||
1059 | return ERR_PTR(-ENODEV); | |
1060 | } | |
1061 | ||
8f510aeb CC |
1062 | /* |
1063 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
1064 | * @dev - instance to the given device | |
86d90fd9 | 1065 | * @phandle_name - name of property holding a phandle value |
8f510aeb CC |
1066 | * @index - index into list of devfreq |
1067 | * | |
1068 | * return the instance of devfreq device | |
1069 | */ | |
86d90fd9 CC |
1070 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, |
1071 | const char *phandle_name, int index) | |
8f510aeb CC |
1072 | { |
1073 | struct device_node *node; | |
1074 | struct devfreq *devfreq; | |
1075 | ||
86d90fd9 | 1076 | if (!dev || !phandle_name) |
8f510aeb CC |
1077 | return ERR_PTR(-EINVAL); |
1078 | ||
1079 | if (!dev->of_node) | |
1080 | return ERR_PTR(-EINVAL); | |
1081 | ||
86d90fd9 | 1082 | node = of_parse_phandle(dev->of_node, phandle_name, index); |
8f510aeb CC |
1083 | if (!node) |
1084 | return ERR_PTR(-ENODEV); | |
1085 | ||
7b38b7b0 | 1086 | devfreq = devfreq_get_devfreq_by_node(node); |
3427c6f0 | 1087 | of_node_put(node); |
8f510aeb | 1088 | |
7b38b7b0 | 1089 | return devfreq; |
8f510aeb | 1090 | } |
7b38b7b0 | 1091 | |
8f510aeb | 1092 | #else |
7b38b7b0 LC |
1093 | struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) |
1094 | { | |
1095 | return ERR_PTR(-ENODEV); | |
1096 | } | |
1097 | ||
86d90fd9 CC |
1098 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, |
1099 | const char *phandle_name, int index) | |
8f510aeb CC |
1100 | { |
1101 | return ERR_PTR(-ENODEV); | |
1102 | } | |
1103 | #endif /* CONFIG_OF */ | |
7b38b7b0 | 1104 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node); |
8f510aeb CC |
1105 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); |
1106 | ||
8cd84092 CC |
1107 | /** |
1108 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
e2fc1677 | 1109 | * @dev: the device from which to remove devfreq feature. |
8cd84092 CC |
1110 | * @devfreq: the devfreq instance to be removed |
1111 | */ | |
1112 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
1113 | { | |
1114 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
1115 | devm_devfreq_dev_match, devfreq)); | |
1116 | } | |
1117 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
1118 | ||
206c30cf RV |
1119 | /** |
1120 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
1121 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
1122 | * |
1123 | * This function is intended to be called by the pm callbacks | |
1124 | * (e.g., runtime_suspend, suspend) of the device driver that | |
1125 | * holds the devfreq. | |
206c30cf RV |
1126 | */ |
1127 | int devfreq_suspend_device(struct devfreq *devfreq) | |
1128 | { | |
83f8ca45 LL |
1129 | int ret; |
1130 | ||
a3c98b8b MH |
1131 | if (!devfreq) |
1132 | return -EINVAL; | |
1133 | ||
83f8ca45 | 1134 | if (atomic_inc_return(&devfreq->suspend_count) > 1) |
1b5c1be2 NM |
1135 | return 0; |
1136 | ||
83f8ca45 LL |
1137 | if (devfreq->governor) { |
1138 | ret = devfreq->governor->event_handler(devfreq, | |
1139 | DEVFREQ_GOV_SUSPEND, NULL); | |
1140 | if (ret) | |
1141 | return ret; | |
1142 | } | |
1143 | ||
1144 | if (devfreq->suspend_freq) { | |
e1e047ac | 1145 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1146 | ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); |
e1e047ac | 1147 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1148 | if (ret) |
1149 | return ret; | |
1150 | } | |
1151 | ||
1152 | return 0; | |
206c30cf RV |
1153 | } |
1154 | EXPORT_SYMBOL(devfreq_suspend_device); | |
1155 | ||
1156 | /** | |
1157 | * devfreq_resume_device() - Resume devfreq of a device. | |
1158 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
1159 | * |
1160 | * This function is intended to be called by the pm callbacks | |
1161 | * (e.g., runtime_resume, resume) of the device driver that | |
1162 | * holds the devfreq. | |
206c30cf RV |
1163 | */ |
1164 | int devfreq_resume_device(struct devfreq *devfreq) | |
1165 | { | |
83f8ca45 LL |
1166 | int ret; |
1167 | ||
206c30cf RV |
1168 | if (!devfreq) |
1169 | return -EINVAL; | |
1170 | ||
83f8ca45 | 1171 | if (atomic_dec_return(&devfreq->suspend_count) >= 1) |
1b5c1be2 NM |
1172 | return 0; |
1173 | ||
83f8ca45 | 1174 | if (devfreq->resume_freq) { |
e1e047ac | 1175 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1176 | ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); |
e1e047ac | 1177 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1178 | if (ret) |
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | if (devfreq->governor) { | |
1183 | ret = devfreq->governor->event_handler(devfreq, | |
1184 | DEVFREQ_GOV_RESUME, NULL); | |
1185 | if (ret) | |
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | return 0; | |
206c30cf RV |
1190 | } |
1191 | EXPORT_SYMBOL(devfreq_resume_device); | |
1192 | ||
59031956 LL |
1193 | /** |
1194 | * devfreq_suspend() - Suspend devfreq governors and devices | |
1195 | * | |
1196 | * Called during system wide Suspend/Hibernate cycles for suspending governors | |
1197 | * and devices preserving the state for resume. On some platforms the devfreq | |
1198 | * device must have precise state (frequency) after resume in order to provide | |
1199 | * fully operating setup. | |
1200 | */ | |
1201 | void devfreq_suspend(void) | |
1202 | { | |
1203 | struct devfreq *devfreq; | |
1204 | int ret; | |
1205 | ||
1206 | mutex_lock(&devfreq_list_lock); | |
1207 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1208 | ret = devfreq_suspend_device(devfreq); | |
1209 | if (ret) | |
1210 | dev_err(&devfreq->dev, | |
1211 | "failed to suspend devfreq device\n"); | |
1212 | } | |
1213 | mutex_unlock(&devfreq_list_lock); | |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * devfreq_resume() - Resume devfreq governors and devices | |
1218 | * | |
1219 | * Called during system wide Suspend/Hibernate cycle for resuming governors and | |
1220 | * devices that are suspended with devfreq_suspend(). | |
1221 | */ | |
1222 | void devfreq_resume(void) | |
1223 | { | |
1224 | struct devfreq *devfreq; | |
1225 | int ret; | |
1226 | ||
1227 | mutex_lock(&devfreq_list_lock); | |
1228 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1229 | ret = devfreq_resume_device(devfreq); | |
1230 | if (ret) | |
1231 | dev_warn(&devfreq->dev, | |
1232 | "failed to resume devfreq device\n"); | |
1233 | } | |
1234 | mutex_unlock(&devfreq_list_lock); | |
1235 | } | |
1236 | ||
3aa173b8 NM |
1237 | /** |
1238 | * devfreq_add_governor() - Add devfreq governor | |
1239 | * @governor: the devfreq governor to be added | |
1240 | */ | |
1241 | int devfreq_add_governor(struct devfreq_governor *governor) | |
1242 | { | |
1243 | struct devfreq_governor *g; | |
1b5c1be2 | 1244 | struct devfreq *devfreq; |
3aa173b8 NM |
1245 | int err = 0; |
1246 | ||
1247 | if (!governor) { | |
1248 | pr_err("%s: Invalid parameters.\n", __func__); | |
1249 | return -EINVAL; | |
1250 | } | |
1251 | ||
1252 | mutex_lock(&devfreq_list_lock); | |
1253 | g = find_devfreq_governor(governor->name); | |
1254 | if (!IS_ERR(g)) { | |
1255 | pr_err("%s: governor %s already registered\n", __func__, | |
1256 | g->name); | |
1257 | err = -EINVAL; | |
1258 | goto err_out; | |
1259 | } | |
9f3bdd4f | 1260 | |
3aa173b8 NM |
1261 | list_add(&governor->node, &devfreq_governor_list); |
1262 | ||
1b5c1be2 NM |
1263 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1264 | int ret = 0; | |
1265 | struct device *dev = devfreq->dev.parent; | |
1266 | ||
96ffcdf2 | 1267 | if (!strncmp(devfreq->governor->name, governor->name, |
1b5c1be2 NM |
1268 | DEVFREQ_NAME_LEN)) { |
1269 | /* The following should never occur */ | |
1270 | if (devfreq->governor) { | |
1271 | dev_warn(dev, | |
1272 | "%s: Governor %s already present\n", | |
1273 | __func__, devfreq->governor->name); | |
1274 | ret = devfreq->governor->event_handler(devfreq, | |
1275 | DEVFREQ_GOV_STOP, NULL); | |
1276 | if (ret) { | |
1277 | dev_warn(dev, | |
1278 | "%s: Governor %s stop = %d\n", | |
1279 | __func__, | |
1280 | devfreq->governor->name, ret); | |
1281 | } | |
1282 | /* Fall through */ | |
1283 | } | |
1284 | devfreq->governor = governor; | |
1285 | ret = devfreq->governor->event_handler(devfreq, | |
1286 | DEVFREQ_GOV_START, NULL); | |
1287 | if (ret) { | |
1288 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
1289 | __func__, devfreq->governor->name, | |
1290 | ret); | |
1291 | } | |
a3c98b8b MH |
1292 | } |
1293 | } | |
1294 | ||
3aa173b8 NM |
1295 | err_out: |
1296 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 1297 | |
3aa173b8 NM |
1298 | return err; |
1299 | } | |
1300 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 1301 | |
3aa173b8 | 1302 | /** |
bafeb42b | 1303 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
1304 | * @governor: the devfreq governor to be removed |
1305 | */ | |
1306 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
1307 | { | |
1308 | struct devfreq_governor *g; | |
1b5c1be2 | 1309 | struct devfreq *devfreq; |
3aa173b8 NM |
1310 | int err = 0; |
1311 | ||
1312 | if (!governor) { | |
1313 | pr_err("%s: Invalid parameters.\n", __func__); | |
1314 | return -EINVAL; | |
1315 | } | |
1316 | ||
1317 | mutex_lock(&devfreq_list_lock); | |
1318 | g = find_devfreq_governor(governor->name); | |
1319 | if (IS_ERR(g)) { | |
1320 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 1321 | governor->name); |
f9c08e2a | 1322 | err = PTR_ERR(g); |
3aa173b8 NM |
1323 | goto err_out; |
1324 | } | |
1b5c1be2 NM |
1325 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1326 | int ret; | |
1327 | struct device *dev = devfreq->dev.parent; | |
1328 | ||
96ffcdf2 | 1329 | if (!strncmp(devfreq->governor->name, governor->name, |
1b5c1be2 NM |
1330 | DEVFREQ_NAME_LEN)) { |
1331 | /* we should have a devfreq governor! */ | |
1332 | if (!devfreq->governor) { | |
1333 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
1334 | __func__, governor->name); | |
1335 | continue; | |
1336 | /* Fall through */ | |
1337 | } | |
1338 | ret = devfreq->governor->event_handler(devfreq, | |
1339 | DEVFREQ_GOV_STOP, NULL); | |
1340 | if (ret) { | |
1341 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
1342 | __func__, devfreq->governor->name, | |
1343 | ret); | |
1344 | } | |
1345 | devfreq->governor = NULL; | |
1346 | } | |
1347 | } | |
3aa173b8 NM |
1348 | |
1349 | list_del(&governor->node); | |
1350 | err_out: | |
1351 | mutex_unlock(&devfreq_list_lock); | |
1352 | ||
1353 | return err; | |
a3c98b8b | 1354 | } |
3aa173b8 | 1355 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 1356 | |
2fee1a7c CC |
1357 | static ssize_t name_show(struct device *dev, |
1358 | struct device_attribute *attr, char *buf) | |
1359 | { | |
483d557e CC |
1360 | struct devfreq *df = to_devfreq(dev); |
1361 | return sprintf(buf, "%s\n", dev_name(df->dev.parent)); | |
2fee1a7c CC |
1362 | } |
1363 | static DEVICE_ATTR_RO(name); | |
1364 | ||
a93d6b0a | 1365 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
1366 | struct device_attribute *attr, char *buf) |
1367 | { | |
483d557e CC |
1368 | struct devfreq *df = to_devfreq(dev); |
1369 | ||
1370 | if (!df->governor) | |
1b5c1be2 NM |
1371 | return -EINVAL; |
1372 | ||
483d557e | 1373 | return sprintf(buf, "%s\n", df->governor->name); |
9005b650 MH |
1374 | } |
1375 | ||
a93d6b0a | 1376 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
1377 | const char *buf, size_t count) |
1378 | { | |
1379 | struct devfreq *df = to_devfreq(dev); | |
1380 | int ret; | |
1381 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
bc658bef | 1382 | const struct devfreq_governor *governor, *prev_governor; |
0359d1af | 1383 | |
483d557e CC |
1384 | if (!df->governor) |
1385 | return -EINVAL; | |
1386 | ||
0359d1af NM |
1387 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); |
1388 | if (ret != 1) | |
1389 | return -EINVAL; | |
1390 | ||
1391 | mutex_lock(&devfreq_list_lock); | |
23c7b54c | 1392 | governor = try_then_request_governor(str_governor); |
0359d1af NM |
1393 | if (IS_ERR(governor)) { |
1394 | ret = PTR_ERR(governor); | |
1395 | goto out; | |
1396 | } | |
14a21e7b TJ |
1397 | if (df->governor == governor) { |
1398 | ret = 0; | |
0359d1af | 1399 | goto out; |
0dd25a0d CC |
1400 | } else if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE) |
1401 | || IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE)) { | |
bcf23c79 CC |
1402 | ret = -EINVAL; |
1403 | goto out; | |
14a21e7b | 1404 | } |
0359d1af | 1405 | |
5f1a9066 CC |
1406 | /* |
1407 | * Stop the current governor and remove the specific sysfs files | |
1408 | * which depend on current governor. | |
1409 | */ | |
483d557e CC |
1410 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); |
1411 | if (ret) { | |
1412 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1413 | __func__, df->governor->name, ret); | |
1414 | goto out; | |
0359d1af | 1415 | } |
5f1a9066 | 1416 | remove_sysfs_files(df, df->governor); |
483d557e | 1417 | |
5f1a9066 CC |
1418 | /* |
1419 | * Start the new governor and create the specific sysfs files | |
1420 | * which depend on the new governor. | |
1421 | */ | |
bc658bef | 1422 | prev_governor = df->governor; |
0359d1af | 1423 | df->governor = governor; |
0359d1af | 1424 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); |
bc658bef | 1425 | if (ret) { |
0359d1af NM |
1426 | dev_warn(dev, "%s: Governor %s not started(%d)\n", |
1427 | __func__, df->governor->name, ret); | |
5f1a9066 CC |
1428 | |
1429 | /* Restore previous governor */ | |
bc658bef | 1430 | df->governor = prev_governor; |
bc658bef SK |
1431 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); |
1432 | if (ret) { | |
1433 | dev_err(dev, | |
1434 | "%s: reverting to Governor %s failed (%d)\n", | |
96ffcdf2 | 1435 | __func__, prev_governor->name, ret); |
bc658bef | 1436 | df->governor = NULL; |
5f1a9066 | 1437 | goto out; |
bc658bef SK |
1438 | } |
1439 | } | |
5f1a9066 CC |
1440 | |
1441 | /* | |
1442 | * Create the sysfs files for the new governor. But if failed to start | |
1443 | * the new governor, restore the sysfs files of previous governor. | |
1444 | */ | |
1445 | create_sysfs_files(df, df->governor); | |
1446 | ||
0359d1af NM |
1447 | out: |
1448 | mutex_unlock(&devfreq_list_lock); | |
1449 | ||
1450 | if (!ret) | |
1451 | ret = count; | |
1452 | return ret; | |
1453 | } | |
a93d6b0a GKH |
1454 | static DEVICE_ATTR_RW(governor); |
1455 | ||
1456 | static ssize_t available_governors_show(struct device *d, | |
1457 | struct device_attribute *attr, | |
1458 | char *buf) | |
50a5b33e | 1459 | { |
bcf23c79 | 1460 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1461 | ssize_t count = 0; |
1462 | ||
483d557e CC |
1463 | if (!df->governor) |
1464 | return -EINVAL; | |
1465 | ||
50a5b33e | 1466 | mutex_lock(&devfreq_list_lock); |
bcf23c79 CC |
1467 | |
1468 | /* | |
1469 | * The devfreq with immutable governor (e.g., passive) shows | |
1470 | * only own governor. | |
1471 | */ | |
0dd25a0d | 1472 | if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) { |
bcf23c79 | 1473 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, |
96ffcdf2 | 1474 | "%s ", df->governor->name); |
bcf23c79 CC |
1475 | /* |
1476 | * The devfreq device shows the registered governor except for | |
1477 | * immutable governors such as passive governor . | |
1478 | */ | |
1479 | } else { | |
1480 | struct devfreq_governor *governor; | |
1481 | ||
1482 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
0dd25a0d | 1483 | if (IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE)) |
bcf23c79 CC |
1484 | continue; |
1485 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1486 | "%s ", governor->name); | |
1487 | } | |
1488 | } | |
1489 | ||
50a5b33e NM |
1490 | mutex_unlock(&devfreq_list_lock); |
1491 | ||
1492 | /* Truncate the trailing space */ | |
1493 | if (count) | |
1494 | count--; | |
1495 | ||
1496 | count += sprintf(&buf[count], "\n"); | |
1497 | ||
1498 | return count; | |
1499 | } | |
a93d6b0a | 1500 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1501 | |
a93d6b0a GKH |
1502 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1503 | char *buf) | |
7f98a905 RV |
1504 | { |
1505 | unsigned long freq; | |
483d557e | 1506 | struct devfreq *df = to_devfreq(dev); |
7f98a905 | 1507 | |
483d557e CC |
1508 | if (!df->profile) |
1509 | return -EINVAL; | |
1510 | ||
1511 | if (df->profile->get_cur_freq && | |
1512 | !df->profile->get_cur_freq(df->dev.parent, &freq)) | |
9d0109be | 1513 | return sprintf(buf, "%lu\n", freq); |
7f98a905 | 1514 | |
483d557e | 1515 | return sprintf(buf, "%lu\n", df->previous_freq); |
7f98a905 | 1516 | } |
a93d6b0a | 1517 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1518 | |
a93d6b0a GKH |
1519 | static ssize_t target_freq_show(struct device *dev, |
1520 | struct device_attribute *attr, char *buf) | |
9005b650 | 1521 | { |
483d557e CC |
1522 | struct devfreq *df = to_devfreq(dev); |
1523 | ||
1524 | return sprintf(buf, "%lu\n", df->previous_freq); | |
9005b650 | 1525 | } |
a93d6b0a | 1526 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1527 | |
a93d6b0a | 1528 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1529 | const char *buf, size_t count) |
1530 | { | |
1531 | struct devfreq *df = to_devfreq(dev); | |
1532 | unsigned long value; | |
1533 | int ret; | |
6530b9de | 1534 | |
27dbc542 LC |
1535 | /* |
1536 | * Protect against theoretical sysfs writes between | |
1537 | * device_add and dev_pm_qos_add_request | |
1538 | */ | |
1539 | if (!dev_pm_qos_request_active(&df->user_min_freq_req)) | |
1540 | return -EAGAIN; | |
1541 | ||
6530b9de MH |
1542 | ret = sscanf(buf, "%lu", &value); |
1543 | if (ret != 1) | |
12e26265 | 1544 | return -EINVAL; |
6530b9de | 1545 | |
27dbc542 LC |
1546 | /* Round down to kHz for PM QoS */ |
1547 | ret = dev_pm_qos_update_request(&df->user_min_freq_req, | |
1548 | value / HZ_PER_KHZ); | |
1549 | if (ret < 0) | |
1550 | return ret; | |
46cecc0b LC |
1551 | |
1552 | return count; | |
6530b9de MH |
1553 | } |
1554 | ||
1051e2c3 CC |
1555 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1556 | char *buf) | |
1557 | { | |
f1d981ea | 1558 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1559 | unsigned long min_freq, max_freq; |
1560 | ||
1561 | mutex_lock(&df->lock); | |
1562 | get_freq_range(df, &min_freq, &max_freq); | |
1563 | mutex_unlock(&df->lock); | |
f1d981ea | 1564 | |
46cecc0b | 1565 | return sprintf(buf, "%lu\n", min_freq); |
1051e2c3 | 1566 | } |
f9002b16 | 1567 | static DEVICE_ATTR_RW(min_freq); |
1051e2c3 | 1568 | |
a93d6b0a | 1569 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1570 | const char *buf, size_t count) |
1571 | { | |
1572 | struct devfreq *df = to_devfreq(dev); | |
1573 | unsigned long value; | |
1574 | int ret; | |
6530b9de | 1575 | |
27dbc542 LC |
1576 | /* |
1577 | * Protect against theoretical sysfs writes between | |
1578 | * device_add and dev_pm_qos_add_request | |
1579 | */ | |
1580 | if (!dev_pm_qos_request_active(&df->user_max_freq_req)) | |
1581 | return -EINVAL; | |
1582 | ||
6530b9de MH |
1583 | ret = sscanf(buf, "%lu", &value); |
1584 | if (ret != 1) | |
12e26265 | 1585 | return -EINVAL; |
6530b9de | 1586 | |
27dbc542 LC |
1587 | /* |
1588 | * PM QoS frequencies are in kHz so we need to convert. Convert by | |
1589 | * rounding upwards so that the acceptable interval never shrinks. | |
1590 | * | |
1591 | * For example if the user writes "666666666" to sysfs this value will | |
1592 | * be converted to 666667 kHz and back to 666667000 Hz before an OPP | |
1593 | * lookup, this ensures that an OPP of 666666666Hz is still accepted. | |
1594 | * | |
1595 | * A value of zero means "no limit". | |
1596 | */ | |
1597 | if (value) | |
1598 | value = DIV_ROUND_UP(value, HZ_PER_KHZ); | |
1599 | else | |
1600 | value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; | |
6530b9de | 1601 | |
27dbc542 LC |
1602 | ret = dev_pm_qos_update_request(&df->user_max_freq_req, value); |
1603 | if (ret < 0) | |
1604 | return ret; | |
46cecc0b LC |
1605 | |
1606 | return count; | |
6530b9de MH |
1607 | } |
1608 | ||
1051e2c3 CC |
1609 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1610 | char *buf) | |
1611 | { | |
f1d981ea | 1612 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1613 | unsigned long min_freq, max_freq; |
1614 | ||
1615 | mutex_lock(&df->lock); | |
1616 | get_freq_range(df, &min_freq, &max_freq); | |
1617 | mutex_unlock(&df->lock); | |
f1d981ea | 1618 | |
46cecc0b | 1619 | return sprintf(buf, "%lu\n", max_freq); |
6530b9de | 1620 | } |
a93d6b0a | 1621 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1622 | |
a93d6b0a GKH |
1623 | static ssize_t available_frequencies_show(struct device *d, |
1624 | struct device_attribute *attr, | |
1625 | char *buf) | |
d287de85 NM |
1626 | { |
1627 | struct devfreq *df = to_devfreq(d); | |
d287de85 | 1628 | ssize_t count = 0; |
416b46a2 | 1629 | int i; |
d287de85 | 1630 | |
483d557e CC |
1631 | if (!df->profile) |
1632 | return -EINVAL; | |
1633 | ||
416b46a2 | 1634 | mutex_lock(&df->lock); |
d287de85 | 1635 | |
416b46a2 | 1636 | for (i = 0; i < df->profile->max_state; i++) |
d287de85 | 1637 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
416b46a2 | 1638 | "%lu ", df->profile->freq_table[i]); |
d287de85 | 1639 | |
416b46a2 | 1640 | mutex_unlock(&df->lock); |
d287de85 NM |
1641 | /* Truncate the trailing space */ |
1642 | if (count) | |
1643 | count--; | |
1644 | ||
1645 | count += sprintf(&buf[count], "\n"); | |
1646 | ||
1647 | return count; | |
1648 | } | |
a93d6b0a | 1649 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1650 | |
a93d6b0a GKH |
1651 | static ssize_t trans_stat_show(struct device *dev, |
1652 | struct device_attribute *attr, char *buf) | |
e552bbaf | 1653 | { |
483d557e | 1654 | struct devfreq *df = to_devfreq(dev); |
e552bbaf | 1655 | ssize_t len; |
39688ce6 | 1656 | int i, j; |
483d557e CC |
1657 | unsigned int max_state; |
1658 | ||
1659 | if (!df->profile) | |
1660 | return -EINVAL; | |
1661 | max_state = df->profile->max_state; | |
e552bbaf | 1662 | |
34bd3220 MH |
1663 | if (max_state == 0) |
1664 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1665 | |
483d557e CC |
1666 | mutex_lock(&df->lock); |
1667 | if (!df->stop_polling && | |
1668 | devfreq_update_status(df, df->previous_freq)) { | |
1669 | mutex_unlock(&df->lock); | |
2abb0d52 LC |
1670 | return 0; |
1671 | } | |
483d557e | 1672 | mutex_unlock(&df->lock); |
2abb0d52 | 1673 | |
d7df1e46 CC |
1674 | len = sprintf(buf, " From : To\n"); |
1675 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1676 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1677 | len += sprintf(buf + len, "%10lu", |
483d557e | 1678 | df->profile->freq_table[i]); |
e552bbaf JL |
1679 | |
1680 | len += sprintf(buf + len, " time(ms)\n"); | |
1681 | ||
1682 | for (i = 0; i < max_state; i++) { | |
483d557e CC |
1683 | if (df->profile->freq_table[i] |
1684 | == df->previous_freq) { | |
e552bbaf JL |
1685 | len += sprintf(buf + len, "*"); |
1686 | } else { | |
1687 | len += sprintf(buf + len, " "); | |
1688 | } | |
d7df1e46 | 1689 | len += sprintf(buf + len, "%10lu:", |
483d557e | 1690 | df->profile->freq_table[i]); |
e552bbaf | 1691 | for (j = 0; j < max_state; j++) |
d7df1e46 | 1692 | len += sprintf(buf + len, "%10u", |
483d557e | 1693 | df->stats.trans_table[(i * max_state) + j]); |
1ebd0bc0 | 1694 | |
b76b3479 | 1695 | len += sprintf(buf + len, "%10llu\n", (u64) |
483d557e | 1696 | jiffies64_to_msecs(df->stats.time_in_state[i])); |
e552bbaf JL |
1697 | } |
1698 | ||
1699 | len += sprintf(buf + len, "Total transition : %u\n", | |
483d557e | 1700 | df->stats.total_trans); |
e552bbaf JL |
1701 | return len; |
1702 | } | |
14a34396 KK |
1703 | |
1704 | static ssize_t trans_stat_store(struct device *dev, | |
1705 | struct device_attribute *attr, | |
1706 | const char *buf, size_t count) | |
1707 | { | |
1708 | struct devfreq *df = to_devfreq(dev); | |
1709 | int err, value; | |
1710 | ||
483d557e CC |
1711 | if (!df->profile) |
1712 | return -EINVAL; | |
1713 | ||
14a34396 KK |
1714 | if (df->profile->max_state == 0) |
1715 | return count; | |
1716 | ||
1717 | err = kstrtoint(buf, 10, &value); | |
1718 | if (err || value != 0) | |
1719 | return -EINVAL; | |
1720 | ||
1721 | mutex_lock(&df->lock); | |
1ebd0bc0 KK |
1722 | memset(df->stats.time_in_state, 0, (df->profile->max_state * |
1723 | sizeof(*df->stats.time_in_state))); | |
1724 | memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), | |
14a34396 KK |
1725 | df->profile->max_state, |
1726 | df->profile->max_state)); | |
1ebd0bc0 KK |
1727 | df->stats.total_trans = 0; |
1728 | df->stats.last_update = get_jiffies_64(); | |
14a34396 KK |
1729 | mutex_unlock(&df->lock); |
1730 | ||
1731 | return count; | |
1732 | } | |
1733 | static DEVICE_ATTR_RW(trans_stat); | |
a93d6b0a | 1734 | |
5f1a9066 CC |
1735 | static struct attribute *devfreq_attrs[] = { |
1736 | &dev_attr_name.attr, | |
1737 | &dev_attr_governor.attr, | |
1738 | &dev_attr_available_governors.attr, | |
1739 | &dev_attr_cur_freq.attr, | |
1740 | &dev_attr_available_frequencies.attr, | |
1741 | &dev_attr_target_freq.attr, | |
1742 | &dev_attr_min_freq.attr, | |
1743 | &dev_attr_max_freq.attr, | |
1744 | &dev_attr_trans_stat.attr, | |
1745 | NULL, | |
1746 | }; | |
1747 | ATTRIBUTE_GROUPS(devfreq); | |
1748 | ||
1749 | static ssize_t polling_interval_show(struct device *dev, | |
1750 | struct device_attribute *attr, char *buf) | |
1751 | { | |
1752 | struct devfreq *df = to_devfreq(dev); | |
1753 | ||
1754 | if (!df->profile) | |
1755 | return -EINVAL; | |
1756 | ||
1757 | return sprintf(buf, "%d\n", df->profile->polling_ms); | |
1758 | } | |
1759 | ||
1760 | static ssize_t polling_interval_store(struct device *dev, | |
1761 | struct device_attribute *attr, | |
1762 | const char *buf, size_t count) | |
1763 | { | |
1764 | struct devfreq *df = to_devfreq(dev); | |
1765 | unsigned int value; | |
1766 | int ret; | |
1767 | ||
1768 | if (!df->governor) | |
1769 | return -EINVAL; | |
1770 | ||
1771 | ret = sscanf(buf, "%u", &value); | |
1772 | if (ret != 1) | |
1773 | return -EINVAL; | |
1774 | ||
1775 | df->governor->event_handler(df, DEVFREQ_GOV_UPDATE_INTERVAL, &value); | |
1776 | ret = count; | |
1777 | ||
1778 | return ret; | |
1779 | } | |
1780 | static DEVICE_ATTR_RW(polling_interval); | |
1781 | ||
4dc3bab8 CC |
1782 | static ssize_t timer_show(struct device *dev, |
1783 | struct device_attribute *attr, char *buf) | |
1784 | { | |
1785 | struct devfreq *df = to_devfreq(dev); | |
1786 | ||
1787 | if (!df->profile) | |
1788 | return -EINVAL; | |
1789 | ||
1790 | return sprintf(buf, "%s\n", timer_name[df->profile->timer]); | |
1791 | } | |
1792 | ||
1793 | static ssize_t timer_store(struct device *dev, struct device_attribute *attr, | |
1794 | const char *buf, size_t count) | |
1795 | { | |
1796 | struct devfreq *df = to_devfreq(dev); | |
1797 | char str_timer[DEVFREQ_NAME_LEN + 1]; | |
1798 | int timer = -1; | |
1799 | int ret = 0, i; | |
1800 | ||
1801 | if (!df->governor || !df->profile) | |
1802 | return -EINVAL; | |
1803 | ||
1804 | ret = sscanf(buf, "%16s", str_timer); | |
1805 | if (ret != 1) | |
1806 | return -EINVAL; | |
1807 | ||
1808 | for (i = 0; i < DEVFREQ_TIMER_NUM; i++) { | |
1809 | if (!strncmp(timer_name[i], str_timer, DEVFREQ_NAME_LEN)) { | |
1810 | timer = i; | |
1811 | break; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | if (timer < 0) { | |
1816 | ret = -EINVAL; | |
1817 | goto out; | |
1818 | } | |
1819 | ||
1820 | if (df->profile->timer == timer) { | |
1821 | ret = 0; | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | mutex_lock(&df->lock); | |
1826 | df->profile->timer = timer; | |
1827 | mutex_unlock(&df->lock); | |
1828 | ||
1829 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1830 | if (ret) { | |
1831 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1832 | __func__, df->governor->name, ret); | |
1833 | goto out; | |
1834 | } | |
1835 | ||
1836 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1837 | if (ret) | |
1838 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
1839 | __func__, df->governor->name, ret); | |
1840 | out: | |
1841 | return ret ? ret : count; | |
1842 | } | |
1843 | static DEVICE_ATTR_RW(timer); | |
1844 | ||
5f1a9066 CC |
1845 | #define CREATE_SYSFS_FILE(df, name) \ |
1846 | { \ | |
1847 | int ret; \ | |
1848 | ret = sysfs_create_file(&df->dev.kobj, &dev_attr_##name.attr); \ | |
1849 | if (ret < 0) { \ | |
1850 | dev_warn(&df->dev, \ | |
1851 | "Unable to create attr(%s)\n", "##name"); \ | |
1852 | } \ | |
1853 | } \ | |
1854 | ||
1855 | /* Create the specific sysfs files which depend on each governor. */ | |
1856 | static void create_sysfs_files(struct devfreq *devfreq, | |
1857 | const struct devfreq_governor *gov) | |
1858 | { | |
1859 | if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL)) | |
1860 | CREATE_SYSFS_FILE(devfreq, polling_interval); | |
1861 | if (IS_SUPPORTED_ATTR(gov->attrs, TIMER)) | |
1862 | CREATE_SYSFS_FILE(devfreq, timer); | |
1863 | } | |
1864 | ||
1865 | /* Remove the specific sysfs files which depend on each governor. */ | |
1866 | static void remove_sysfs_files(struct devfreq *devfreq, | |
1867 | const struct devfreq_governor *gov) | |
1868 | { | |
1869 | if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL)) | |
1870 | sysfs_remove_file(&devfreq->dev.kobj, | |
1871 | &dev_attr_polling_interval.attr); | |
1872 | if (IS_SUPPORTED_ATTR(gov->attrs, TIMER)) | |
1873 | sysfs_remove_file(&devfreq->dev.kobj, &dev_attr_timer.attr); | |
1874 | } | |
9005b650 | 1875 | |
490a421b CC |
1876 | /** |
1877 | * devfreq_summary_show() - Show the summary of the devfreq devices | |
1878 | * @s: seq_file instance to show the summary of devfreq devices | |
1879 | * @data: not used | |
1880 | * | |
1881 | * Show the summary of the devfreq devices via 'devfreq_summary' debugfs file. | |
1882 | * It helps that user can know the detailed information of the devfreq devices. | |
1883 | * | |
1884 | * Return 0 always because it shows the information without any data change. | |
1885 | */ | |
1886 | static int devfreq_summary_show(struct seq_file *s, void *data) | |
1887 | { | |
1888 | struct devfreq *devfreq; | |
1889 | struct devfreq *p_devfreq = NULL; | |
1890 | unsigned long cur_freq, min_freq, max_freq; | |
1891 | unsigned int polling_ms; | |
0c309ed1 | 1892 | unsigned int timer; |
490a421b | 1893 | |
0c309ed1 | 1894 | seq_printf(s, "%-30s %-30s %-15s %-10s %10s %12s %12s %12s\n", |
490a421b CC |
1895 | "dev", |
1896 | "parent_dev", | |
1897 | "governor", | |
0c309ed1 | 1898 | "timer", |
490a421b CC |
1899 | "polling_ms", |
1900 | "cur_freq_Hz", | |
1901 | "min_freq_Hz", | |
1902 | "max_freq_Hz"); | |
0c309ed1 | 1903 | seq_printf(s, "%30s %30s %15s %10s %10s %12s %12s %12s\n", |
0aae11bc | 1904 | "------------------------------", |
490a421b | 1905 | "------------------------------", |
490a421b CC |
1906 | "---------------", |
1907 | "----------", | |
0c309ed1 | 1908 | "----------", |
490a421b CC |
1909 | "------------", |
1910 | "------------", | |
1911 | "------------"); | |
1912 | ||
1913 | mutex_lock(&devfreq_list_lock); | |
1914 | ||
1915 | list_for_each_entry_reverse(devfreq, &devfreq_list, node) { | |
1916 | #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) | |
96ffcdf2 | 1917 | if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE, |
490a421b CC |
1918 | DEVFREQ_NAME_LEN)) { |
1919 | struct devfreq_passive_data *data = devfreq->data; | |
1920 | ||
1921 | if (data) | |
1922 | p_devfreq = data->parent; | |
1923 | } else { | |
1924 | p_devfreq = NULL; | |
1925 | } | |
1926 | #endif | |
1927 | ||
1928 | mutex_lock(&devfreq->lock); | |
27a69714 | 1929 | cur_freq = devfreq->previous_freq; |
490a421b | 1930 | get_freq_range(devfreq, &min_freq, &max_freq); |
0c309ed1 | 1931 | timer = devfreq->profile->timer; |
5f1a9066 CC |
1932 | |
1933 | if (IS_SUPPORTED_ATTR(devfreq->governor->attrs, POLLING_INTERVAL)) | |
1934 | polling_ms = devfreq->profile->polling_ms; | |
1935 | else | |
1936 | polling_ms = 0; | |
490a421b CC |
1937 | mutex_unlock(&devfreq->lock); |
1938 | ||
1939 | seq_printf(s, | |
0c309ed1 | 1940 | "%-30s %-30s %-15s %-10s %10d %12ld %12ld %12ld\n", |
490a421b CC |
1941 | dev_name(&devfreq->dev), |
1942 | p_devfreq ? dev_name(&p_devfreq->dev) : "null", | |
96ffcdf2 | 1943 | devfreq->governor->name, |
0c309ed1 | 1944 | polling_ms ? timer_name[timer] : "null", |
490a421b CC |
1945 | polling_ms, |
1946 | cur_freq, | |
1947 | min_freq, | |
1948 | max_freq); | |
1949 | } | |
1950 | ||
1951 | mutex_unlock(&devfreq_list_lock); | |
1952 | ||
1953 | return 0; | |
1954 | } | |
1955 | DEFINE_SHOW_ATTRIBUTE(devfreq_summary); | |
1956 | ||
a3c98b8b MH |
1957 | static int __init devfreq_init(void) |
1958 | { | |
1959 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1960 | if (IS_ERR(devfreq_class)) { | |
1961 | pr_err("%s: couldn't create class\n", __FILE__); | |
1962 | return PTR_ERR(devfreq_class); | |
1963 | } | |
7e6fdd4b RV |
1964 | |
1965 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1966 | if (!devfreq_wq) { |
7e6fdd4b RV |
1967 | class_destroy(devfreq_class); |
1968 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1969 | return -ENOMEM; |
7e6fdd4b | 1970 | } |
a93d6b0a | 1971 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1972 | |
490a421b CC |
1973 | devfreq_debugfs = debugfs_create_dir("devfreq", NULL); |
1974 | debugfs_create_file("devfreq_summary", 0444, | |
1975 | devfreq_debugfs, NULL, | |
1976 | &devfreq_summary_fops); | |
1977 | ||
a3c98b8b MH |
1978 | return 0; |
1979 | } | |
1980 | subsys_initcall(devfreq_init); | |
1981 | ||
a3c98b8b | 1982 | /* |
4091fb95 | 1983 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1984 | * OPP framework. |
1985 | */ | |
1986 | ||
1987 | /** | |
1988 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1989 | * freq value given to target callback. | |
c5b4a1c1 NM |
1990 | * @dev: The devfreq user device. (parent of devfreq) |
1991 | * @freq: The frequency given to target function | |
1992 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1993 | * |
8a31d9d9 VK |
1994 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1995 | * use. | |
a3c98b8b | 1996 | */ |
47d43ba7 NM |
1997 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1998 | unsigned long *freq, | |
1999 | u32 flags) | |
a3c98b8b | 2000 | { |
47d43ba7 | 2001 | struct dev_pm_opp *opp; |
a3c98b8b | 2002 | |
ab5f299f MH |
2003 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
2004 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 2005 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
2006 | |
2007 | /* If not available, use the closest opp */ | |
0779726c | 2008 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 2009 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
2010 | } else { |
2011 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 2012 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
2013 | |
2014 | /* If not available, use the closest opp */ | |
0779726c | 2015 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 2016 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
2017 | } |
2018 | ||
a3c98b8b MH |
2019 | return opp; |
2020 | } | |
bd7e9277 | 2021 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
2022 | |
2023 | /** | |
2024 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
6d690f77 MH |
2025 | * for any changes in the OPP availability |
2026 | * changes | |
c5b4a1c1 NM |
2027 | * @dev: The devfreq user device. (parent of devfreq) |
2028 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
2029 | */ |
2030 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
2031 | { | |
dc2c9ad5 | 2032 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 2033 | } |
bd7e9277 | 2034 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
2035 | |
2036 | /** | |
2037 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
6d690f77 MH |
2038 | * notified for any changes in the OPP |
2039 | * availability changes anymore. | |
c5b4a1c1 NM |
2040 | * @dev: The devfreq user device. (parent of devfreq) |
2041 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
2042 | * |
2043 | * At exit() callback of devfreq_dev_profile, this must be included if | |
2044 | * devfreq_recommended_opp is used. | |
2045 | */ | |
2046 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
2047 | { | |
dc2c9ad5 | 2048 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 2049 | } |
bd7e9277 | 2050 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 2051 | |
d5b040d0 CC |
2052 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
2053 | { | |
2054 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
2055 | } | |
2056 | ||
2057 | /** | |
6d690f77 MH |
2058 | * devm_devfreq_register_opp_notifier() - Resource-managed |
2059 | * devfreq_register_opp_notifier() | |
d5b040d0 CC |
2060 | * @dev: The devfreq user device. (parent of devfreq) |
2061 | * @devfreq: The devfreq object. | |
2062 | */ | |
2063 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
2064 | struct devfreq *devfreq) | |
2065 | { | |
2066 | struct devfreq **ptr; | |
2067 | int ret; | |
2068 | ||
2069 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
2070 | if (!ptr) | |
2071 | return -ENOMEM; | |
2072 | ||
2073 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
2074 | if (ret) { | |
2075 | devres_free(ptr); | |
2076 | return ret; | |
2077 | } | |
2078 | ||
2079 | *ptr = devfreq; | |
2080 | devres_add(dev, ptr); | |
2081 | ||
2082 | return 0; | |
2083 | } | |
2084 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
2085 | ||
2086 | /** | |
6d690f77 MH |
2087 | * devm_devfreq_unregister_opp_notifier() - Resource-managed |
2088 | * devfreq_unregister_opp_notifier() | |
d5b040d0 CC |
2089 | * @dev: The devfreq user device. (parent of devfreq) |
2090 | * @devfreq: The devfreq object. | |
2091 | */ | |
2092 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
2093 | struct devfreq *devfreq) | |
2094 | { | |
2095 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
2096 | devm_devfreq_dev_match, devfreq)); | |
2097 | } | |
2098 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
2099 | ||
0fe3a664 CC |
2100 | /** |
2101 | * devfreq_register_notifier() - Register a driver with devfreq | |
2102 | * @devfreq: The devfreq object. | |
2103 | * @nb: The notifier block to register. | |
2104 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2105 | */ | |
2106 | int devfreq_register_notifier(struct devfreq *devfreq, | |
6d690f77 MH |
2107 | struct notifier_block *nb, |
2108 | unsigned int list) | |
0fe3a664 CC |
2109 | { |
2110 | int ret = 0; | |
2111 | ||
2112 | if (!devfreq) | |
2113 | return -EINVAL; | |
2114 | ||
2115 | switch (list) { | |
2116 | case DEVFREQ_TRANSITION_NOTIFIER: | |
2117 | ret = srcu_notifier_chain_register( | |
2118 | &devfreq->transition_notifier_list, nb); | |
2119 | break; | |
2120 | default: | |
2121 | ret = -EINVAL; | |
2122 | } | |
2123 | ||
2124 | return ret; | |
2125 | } | |
2126 | EXPORT_SYMBOL(devfreq_register_notifier); | |
2127 | ||
2128 | /* | |
2129 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
2130 | * @devfreq: The devfreq object. | |
2131 | * @nb: The notifier block to be unregistered. | |
2132 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2133 | */ | |
2134 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
2135 | struct notifier_block *nb, | |
2136 | unsigned int list) | |
2137 | { | |
2138 | int ret = 0; | |
2139 | ||
2140 | if (!devfreq) | |
2141 | return -EINVAL; | |
2142 | ||
2143 | switch (list) { | |
2144 | case DEVFREQ_TRANSITION_NOTIFIER: | |
2145 | ret = srcu_notifier_chain_unregister( | |
2146 | &devfreq->transition_notifier_list, nb); | |
2147 | break; | |
2148 | default: | |
2149 | ret = -EINVAL; | |
2150 | } | |
2151 | ||
2152 | return ret; | |
2153 | } | |
2154 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
2155 | ||
2156 | struct devfreq_notifier_devres { | |
2157 | struct devfreq *devfreq; | |
2158 | struct notifier_block *nb; | |
2159 | unsigned int list; | |
2160 | }; | |
2161 | ||
2162 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
2163 | { | |
2164 | struct devfreq_notifier_devres *this = res; | |
2165 | ||
2166 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
2167 | } | |
2168 | ||
2169 | /** | |
2170 | * devm_devfreq_register_notifier() | |
54cb5740 | 2171 | * - Resource-managed devfreq_register_notifier() |
0fe3a664 CC |
2172 | * @dev: The devfreq user device. (parent of devfreq) |
2173 | * @devfreq: The devfreq object. | |
2174 | * @nb: The notifier block to be unregistered. | |
2175 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2176 | */ | |
2177 | int devm_devfreq_register_notifier(struct device *dev, | |
2178 | struct devfreq *devfreq, | |
2179 | struct notifier_block *nb, | |
2180 | unsigned int list) | |
2181 | { | |
2182 | struct devfreq_notifier_devres *ptr; | |
2183 | int ret; | |
2184 | ||
2185 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
2186 | GFP_KERNEL); | |
2187 | if (!ptr) | |
2188 | return -ENOMEM; | |
2189 | ||
2190 | ret = devfreq_register_notifier(devfreq, nb, list); | |
2191 | if (ret) { | |
2192 | devres_free(ptr); | |
2193 | return ret; | |
2194 | } | |
2195 | ||
2196 | ptr->devfreq = devfreq; | |
2197 | ptr->nb = nb; | |
2198 | ptr->list = list; | |
2199 | devres_add(dev, ptr); | |
2200 | ||
2201 | return 0; | |
2202 | } | |
2203 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
2204 | ||
2205 | /** | |
2206 | * devm_devfreq_unregister_notifier() | |
54cb5740 | 2207 | * - Resource-managed devfreq_unregister_notifier() |
0fe3a664 CC |
2208 | * @dev: The devfreq user device. (parent of devfreq) |
2209 | * @devfreq: The devfreq object. | |
2210 | * @nb: The notifier block to be unregistered. | |
2211 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2212 | */ | |
2213 | void devm_devfreq_unregister_notifier(struct device *dev, | |
6d690f77 MH |
2214 | struct devfreq *devfreq, |
2215 | struct notifier_block *nb, | |
2216 | unsigned int list) | |
0fe3a664 CC |
2217 | { |
2218 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
2219 | devm_devfreq_dev_match, devfreq)); | |
2220 | } | |
2221 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |