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