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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 | ||
05d7ae15 LC |
34 | #define HZ_PER_KHZ 1000 |
35 | ||
1a1357ea | 36 | static struct class *devfreq_class; |
490a421b | 37 | static struct dentry *devfreq_debugfs; |
a3c98b8b MH |
38 | |
39 | /* | |
7e6fdd4b RV |
40 | * devfreq core provides delayed work based load monitoring helper |
41 | * functions. Governors can use these or can implement their own | |
42 | * monitoring mechanism. | |
a3c98b8b | 43 | */ |
a3c98b8b | 44 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 45 | |
3aa173b8 NM |
46 | /* The list of all device-devfreq governors */ |
47 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
48 | /* The list of all device-devfreq */ |
49 | static LIST_HEAD(devfreq_list); | |
50 | static DEFINE_MUTEX(devfreq_list_lock); | |
51 | ||
52 | /** | |
53 | * find_device_devfreq() - find devfreq struct using device pointer | |
54 | * @dev: device pointer used to lookup device devfreq. | |
55 | * | |
56 | * Search the list of device devfreqs and return the matched device's | |
57 | * devfreq info. devfreq_list_lock should be held by the caller. | |
58 | */ | |
59 | static struct devfreq *find_device_devfreq(struct device *dev) | |
60 | { | |
61 | struct devfreq *tmp_devfreq; | |
62 | ||
9348da2f | 63 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
64 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
65 | return ERR_PTR(-EINVAL); | |
66 | } | |
67 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
68 | "devfreq_list_lock must be locked."); | |
69 | ||
70 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
71 | if (tmp_devfreq->dev.parent == dev) | |
72 | return tmp_devfreq; | |
73 | } | |
74 | ||
75 | return ERR_PTR(-ENODEV); | |
76 | } | |
77 | ||
ab8f58ad CC |
78 | static unsigned long find_available_min_freq(struct devfreq *devfreq) |
79 | { | |
80 | struct dev_pm_opp *opp; | |
81 | unsigned long min_freq = 0; | |
82 | ||
83 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); | |
84 | if (IS_ERR(opp)) | |
85 | min_freq = 0; | |
86 | else | |
87 | dev_pm_opp_put(opp); | |
88 | ||
89 | return min_freq; | |
90 | } | |
91 | ||
92 | static unsigned long find_available_max_freq(struct devfreq *devfreq) | |
93 | { | |
94 | struct dev_pm_opp *opp; | |
95 | unsigned long max_freq = ULONG_MAX; | |
96 | ||
97 | opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); | |
98 | if (IS_ERR(opp)) | |
99 | max_freq = 0; | |
100 | else | |
101 | dev_pm_opp_put(opp); | |
102 | ||
103 | return max_freq; | |
104 | } | |
105 | ||
46cecc0b LC |
106 | /** |
107 | * get_freq_range() - Get the current freq range | |
108 | * @devfreq: the devfreq instance | |
109 | * @min_freq: the min frequency | |
110 | * @max_freq: the max frequency | |
111 | * | |
112 | * This takes into consideration all constraints. | |
113 | */ | |
114 | static void get_freq_range(struct devfreq *devfreq, | |
115 | unsigned long *min_freq, | |
116 | unsigned long *max_freq) | |
117 | { | |
118 | unsigned long *freq_table = devfreq->profile->freq_table; | |
05d7ae15 | 119 | s32 qos_min_freq, qos_max_freq; |
46cecc0b LC |
120 | |
121 | lockdep_assert_held(&devfreq->lock); | |
122 | ||
123 | /* | |
124 | * Initialize minimum/maximum frequency from freq table. | |
125 | * The devfreq drivers can initialize this in either ascending or | |
126 | * descending order and devfreq core supports both. | |
127 | */ | |
128 | if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { | |
129 | *min_freq = freq_table[0]; | |
130 | *max_freq = freq_table[devfreq->profile->max_state - 1]; | |
131 | } else { | |
132 | *min_freq = freq_table[devfreq->profile->max_state - 1]; | |
133 | *max_freq = freq_table[0]; | |
134 | } | |
135 | ||
05d7ae15 LC |
136 | /* Apply constraints from PM QoS */ |
137 | qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
138 | DEV_PM_QOS_MIN_FREQUENCY); | |
139 | qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
140 | DEV_PM_QOS_MAX_FREQUENCY); | |
141 | *min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq); | |
142 | if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE) | |
143 | *max_freq = min(*max_freq, | |
144 | (unsigned long)HZ_PER_KHZ * qos_max_freq); | |
145 | ||
46cecc0b LC |
146 | /* Apply constraints from OPP interface */ |
147 | *min_freq = max(*min_freq, devfreq->scaling_min_freq); | |
148 | *max_freq = min(*max_freq, devfreq->scaling_max_freq); | |
149 | ||
150 | if (*min_freq > *max_freq) | |
151 | *min_freq = *max_freq; | |
152 | } | |
153 | ||
e552bbaf JL |
154 | /** |
155 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
156 | * @devfreq: the devfreq instance | |
157 | * @freq: the target frequency | |
158 | */ | |
159 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
160 | { | |
161 | int lev; | |
162 | ||
163 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
164 | if (freq == devfreq->profile->freq_table[lev]) | |
165 | return lev; | |
166 | ||
167 | return -EINVAL; | |
168 | } | |
169 | ||
ea572f81 | 170 | static int set_freq_table(struct devfreq *devfreq) |
0ec09ac2 CC |
171 | { |
172 | struct devfreq_dev_profile *profile = devfreq->profile; | |
173 | struct dev_pm_opp *opp; | |
174 | unsigned long freq; | |
175 | int i, count; | |
176 | ||
177 | /* Initialize the freq_table from OPP table */ | |
178 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
179 | if (count <= 0) | |
ea572f81 | 180 | return -EINVAL; |
0ec09ac2 CC |
181 | |
182 | profile->max_state = count; | |
183 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
184 | profile->max_state, | |
185 | sizeof(*profile->freq_table), | |
186 | GFP_KERNEL); | |
187 | if (!profile->freq_table) { | |
188 | profile->max_state = 0; | |
ea572f81 | 189 | return -ENOMEM; |
0ec09ac2 CC |
190 | } |
191 | ||
0ec09ac2 CC |
192 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { |
193 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
194 | if (IS_ERR(opp)) { | |
195 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
196 | profile->max_state = 0; | |
ea572f81 | 197 | return PTR_ERR(opp); |
0ec09ac2 | 198 | } |
8a31d9d9 | 199 | dev_pm_opp_put(opp); |
0ec09ac2 CC |
200 | profile->freq_table[i] = freq; |
201 | } | |
ea572f81 CC |
202 | |
203 | return 0; | |
0ec09ac2 CC |
204 | } |
205 | ||
e552bbaf JL |
206 | /** |
207 | * devfreq_update_status() - Update statistics of devfreq behavior | |
208 | * @devfreq: the devfreq instance | |
209 | * @freq: the update target frequency | |
210 | */ | |
30582c25 | 211 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 212 | { |
e35d35a1 | 213 | int lev, prev_lev, ret = 0; |
b76b3479 | 214 | u64 cur_time; |
e552bbaf | 215 | |
2abb0d52 | 216 | lockdep_assert_held(&devfreq->lock); |
b76b3479 | 217 | cur_time = get_jiffies_64(); |
e35d35a1 | 218 | |
d0563a03 TJ |
219 | /* Immediately exit if previous_freq is not initialized yet. */ |
220 | if (!devfreq->previous_freq) | |
221 | goto out; | |
222 | ||
e35d35a1 SK |
223 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
224 | if (prev_lev < 0) { | |
225 | ret = prev_lev; | |
226 | goto out; | |
227 | } | |
228 | ||
1ebd0bc0 KK |
229 | devfreq->stats.time_in_state[prev_lev] += |
230 | cur_time - devfreq->stats.last_update; | |
e35d35a1 SK |
231 | |
232 | lev = devfreq_get_freq_level(devfreq, freq); | |
233 | if (lev < 0) { | |
234 | ret = lev; | |
235 | goto out; | |
236 | } | |
237 | ||
238 | if (lev != prev_lev) { | |
1ebd0bc0 KK |
239 | devfreq->stats.trans_table[ |
240 | (prev_lev * devfreq->profile->max_state) + lev]++; | |
241 | devfreq->stats.total_trans++; | |
e552bbaf | 242 | } |
e552bbaf | 243 | |
e35d35a1 | 244 | out: |
1ebd0bc0 | 245 | devfreq->stats.last_update = cur_time; |
e35d35a1 | 246 | return ret; |
e552bbaf | 247 | } |
30582c25 | 248 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 249 | |
3aa173b8 NM |
250 | /** |
251 | * find_devfreq_governor() - find devfreq governor from name | |
252 | * @name: name of the governor | |
253 | * | |
254 | * Search the list of devfreq governors and return the matched | |
255 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
256 | */ | |
257 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
258 | { | |
259 | struct devfreq_governor *tmp_governor; | |
260 | ||
9348da2f | 261 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
262 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
263 | return ERR_PTR(-EINVAL); | |
264 | } | |
265 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
266 | "devfreq_list_lock must be locked."); | |
267 | ||
268 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
269 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
270 | return tmp_governor; | |
271 | } | |
272 | ||
273 | return ERR_PTR(-ENODEV); | |
274 | } | |
275 | ||
23c7b54c EBS |
276 | /** |
277 | * try_then_request_governor() - Try to find the governor and request the | |
278 | * module if is not found. | |
279 | * @name: name of the governor | |
280 | * | |
281 | * Search the list of devfreq governors and request the module and try again | |
282 | * if is not found. This can happen when both drivers (the governor driver | |
283 | * and the driver that call devfreq_add_device) are built as modules. | |
284 | * devfreq_list_lock should be held by the caller. Returns the matched | |
b53b0128 | 285 | * governor's pointer or an error pointer. |
23c7b54c EBS |
286 | */ |
287 | static struct devfreq_governor *try_then_request_governor(const char *name) | |
288 | { | |
289 | struct devfreq_governor *governor; | |
290 | int err = 0; | |
291 | ||
292 | if (IS_ERR_OR_NULL(name)) { | |
293 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); | |
294 | return ERR_PTR(-EINVAL); | |
295 | } | |
296 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
297 | "devfreq_list_lock must be locked."); | |
298 | ||
299 | governor = find_devfreq_governor(name); | |
300 | if (IS_ERR(governor)) { | |
301 | mutex_unlock(&devfreq_list_lock); | |
302 | ||
303 | if (!strncmp(name, DEVFREQ_GOV_SIMPLE_ONDEMAND, | |
304 | DEVFREQ_NAME_LEN)) | |
305 | err = request_module("governor_%s", "simpleondemand"); | |
306 | else | |
307 | err = request_module("governor_%s", name); | |
308 | /* Restore previous state before return */ | |
309 | mutex_lock(&devfreq_list_lock); | |
310 | if (err) | |
7544fd7f | 311 | return (err < 0) ? ERR_PTR(err) : ERR_PTR(-EINVAL); |
23c7b54c EBS |
312 | |
313 | governor = find_devfreq_governor(name); | |
314 | } | |
315 | ||
316 | return governor; | |
317 | } | |
318 | ||
0fe3a664 CC |
319 | static int devfreq_notify_transition(struct devfreq *devfreq, |
320 | struct devfreq_freqs *freqs, unsigned int state) | |
321 | { | |
322 | if (!devfreq) | |
323 | return -EINVAL; | |
324 | ||
325 | switch (state) { | |
326 | case DEVFREQ_PRECHANGE: | |
327 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
328 | DEVFREQ_PRECHANGE, freqs); | |
329 | break; | |
330 | ||
331 | case DEVFREQ_POSTCHANGE: | |
332 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
333 | DEVFREQ_POSTCHANGE, freqs); | |
334 | break; | |
335 | default: | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
63314172 LL |
342 | static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, |
343 | u32 flags) | |
344 | { | |
345 | struct devfreq_freqs freqs; | |
346 | unsigned long cur_freq; | |
347 | int err = 0; | |
348 | ||
349 | if (devfreq->profile->get_cur_freq) | |
350 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
351 | else | |
352 | cur_freq = devfreq->previous_freq; | |
353 | ||
354 | freqs.old = cur_freq; | |
355 | freqs.new = new_freq; | |
356 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
357 | ||
358 | err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); | |
359 | if (err) { | |
360 | freqs.new = cur_freq; | |
361 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
362 | return err; | |
363 | } | |
364 | ||
365 | freqs.new = new_freq; | |
366 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
367 | ||
368 | if (devfreq_update_status(devfreq, new_freq)) | |
369 | dev_err(&devfreq->dev, | |
370 | "Couldn't update frequency transition information.\n"); | |
371 | ||
372 | devfreq->previous_freq = new_freq; | |
83f8ca45 LL |
373 | |
374 | if (devfreq->suspend_freq) | |
375 | devfreq->resume_freq = cur_freq; | |
376 | ||
63314172 LL |
377 | return err; |
378 | } | |
379 | ||
7e6fdd4b RV |
380 | /* Load monitoring helper functions for governors use */ |
381 | ||
a3c98b8b MH |
382 | /** |
383 | * update_devfreq() - Reevaluate the device and configure frequency. | |
384 | * @devfreq: the devfreq instance. | |
385 | * | |
386 | * Note: Lock devfreq->lock before calling update_devfreq | |
387 | * This function is exported for governors. | |
388 | */ | |
389 | int update_devfreq(struct devfreq *devfreq) | |
390 | { | |
63314172 | 391 | unsigned long freq, min_freq, max_freq; |
a3c98b8b | 392 | int err = 0; |
ab5f299f | 393 | u32 flags = 0; |
a3c98b8b MH |
394 | |
395 | if (!mutex_is_locked(&devfreq->lock)) { | |
396 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
397 | return -EINVAL; | |
398 | } | |
399 | ||
1b5c1be2 NM |
400 | if (!devfreq->governor) |
401 | return -EINVAL; | |
402 | ||
a3c98b8b MH |
403 | /* Reevaluate the proper frequency */ |
404 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
405 | if (err) | |
406 | return err; | |
46cecc0b | 407 | get_freq_range(devfreq, &min_freq, &max_freq); |
ab5f299f | 408 | |
df5cf4a3 | 409 | if (freq < min_freq) { |
f1d981ea | 410 | freq = min_freq; |
ab5f299f MH |
411 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ |
412 | } | |
df5cf4a3 | 413 | if (freq > max_freq) { |
f1d981ea | 414 | freq = max_freq; |
ab5f299f MH |
415 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ |
416 | } | |
417 | ||
63314172 | 418 | return devfreq_set_target(devfreq, freq, flags); |
0fe3a664 | 419 | |
a3c98b8b | 420 | } |
2df5021f | 421 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 422 | |
7e6fdd4b RV |
423 | /** |
424 | * devfreq_monitor() - Periodically poll devfreq objects. | |
425 | * @work: the work struct used to run devfreq_monitor periodically. | |
426 | * | |
427 | */ | |
428 | static void devfreq_monitor(struct work_struct *work) | |
429 | { | |
430 | int err; | |
431 | struct devfreq *devfreq = container_of(work, | |
432 | struct devfreq, work.work); | |
433 | ||
434 | mutex_lock(&devfreq->lock); | |
435 | err = update_devfreq(devfreq); | |
436 | if (err) | |
437 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
438 | ||
439 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
440 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
441 | mutex_unlock(&devfreq->lock); | |
cf451adf LL |
442 | |
443 | trace_devfreq_monitor(devfreq); | |
7e6fdd4b RV |
444 | } |
445 | ||
446 | /** | |
447 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
448 | * @devfreq: the devfreq instance. | |
449 | * | |
2c090832 | 450 | * Helper function for starting devfreq device load monitoring. By |
7e6fdd4b RV |
451 | * default delayed work based monitoring is supported. Function |
452 | * to be called from governor in response to DEVFREQ_GOV_START | |
453 | * event when device is added to devfreq framework. | |
454 | */ | |
455 | void devfreq_monitor_start(struct devfreq *devfreq) | |
456 | { | |
5c0f6c79 DO |
457 | if (devfreq->governor->interrupt_driven) |
458 | return; | |
459 | ||
7e6fdd4b RV |
460 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); |
461 | if (devfreq->profile->polling_ms) | |
462 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
463 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
464 | } | |
6dcdd8e3 | 465 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
466 | |
467 | /** | |
468 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
469 | * @devfreq: the devfreq instance. | |
470 | * | |
2c090832 | 471 | * Helper function to stop devfreq device load monitoring. Function |
7e6fdd4b RV |
472 | * to be called from governor in response to DEVFREQ_GOV_STOP |
473 | * event when device is removed from devfreq framework. | |
474 | */ | |
475 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
476 | { | |
5c0f6c79 DO |
477 | if (devfreq->governor->interrupt_driven) |
478 | return; | |
479 | ||
7e6fdd4b RV |
480 | cancel_delayed_work_sync(&devfreq->work); |
481 | } | |
6dcdd8e3 | 482 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
483 | |
484 | /** | |
485 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
486 | * @devfreq: the devfreq instance. | |
487 | * | |
2c090832 | 488 | * Helper function to suspend devfreq device load monitoring. Function |
7e6fdd4b RV |
489 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND |
490 | * event or when polling interval is set to zero. | |
491 | * | |
492 | * Note: Though this function is same as devfreq_monitor_stop(), | |
493 | * intentionally kept separate to provide hooks for collecting | |
494 | * transition statistics. | |
495 | */ | |
496 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
497 | { | |
498 | mutex_lock(&devfreq->lock); | |
499 | if (devfreq->stop_polling) { | |
500 | mutex_unlock(&devfreq->lock); | |
501 | return; | |
502 | } | |
503 | ||
39688ce6 | 504 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
505 | devfreq->stop_polling = true; |
506 | mutex_unlock(&devfreq->lock); | |
5c0f6c79 DO |
507 | |
508 | if (devfreq->governor->interrupt_driven) | |
509 | return; | |
510 | ||
7e6fdd4b RV |
511 | cancel_delayed_work_sync(&devfreq->work); |
512 | } | |
6dcdd8e3 | 513 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
514 | |
515 | /** | |
516 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
517 | * @devfreq: the devfreq instance. | |
518 | * | |
2c090832 | 519 | * Helper function to resume devfreq device load monitoring. Function |
7e6fdd4b RV |
520 | * to be called from governor in response to DEVFREQ_GOV_RESUME |
521 | * event or when polling interval is set to non-zero. | |
522 | */ | |
523 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
524 | { | |
39688ce6 RV |
525 | unsigned long freq; |
526 | ||
7e6fdd4b RV |
527 | mutex_lock(&devfreq->lock); |
528 | if (!devfreq->stop_polling) | |
529 | goto out; | |
530 | ||
5c0f6c79 DO |
531 | if (devfreq->governor->interrupt_driven) |
532 | goto out_update; | |
533 | ||
7e6fdd4b RV |
534 | if (!delayed_work_pending(&devfreq->work) && |
535 | devfreq->profile->polling_ms) | |
536 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
537 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 | 538 | |
5c0f6c79 | 539 | out_update: |
1ebd0bc0 | 540 | devfreq->stats.last_update = get_jiffies_64(); |
7e6fdd4b RV |
541 | devfreq->stop_polling = false; |
542 | ||
39688ce6 RV |
543 | if (devfreq->profile->get_cur_freq && |
544 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
545 | devfreq->previous_freq = freq; | |
546 | ||
7e6fdd4b RV |
547 | out: |
548 | mutex_unlock(&devfreq->lock); | |
549 | } | |
6dcdd8e3 | 550 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
551 | |
552 | /** | |
3a1ec2e8 | 553 | * devfreq_update_interval() - Update device devfreq monitoring interval |
7e6fdd4b RV |
554 | * @devfreq: the devfreq instance. |
555 | * @delay: new polling interval to be set. | |
556 | * | |
557 | * Helper function to set new load monitoring polling interval. Function | |
3a1ec2e8 | 558 | * to be called from governor in response to DEVFREQ_GOV_UPDATE_INTERVAL event. |
7e6fdd4b | 559 | */ |
3a1ec2e8 | 560 | void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) |
7e6fdd4b RV |
561 | { |
562 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
563 | unsigned int new_delay = *delay; | |
564 | ||
565 | mutex_lock(&devfreq->lock); | |
566 | devfreq->profile->polling_ms = new_delay; | |
567 | ||
568 | if (devfreq->stop_polling) | |
569 | goto out; | |
570 | ||
5c0f6c79 DO |
571 | if (devfreq->governor->interrupt_driven) |
572 | goto out; | |
573 | ||
7e6fdd4b RV |
574 | /* if new delay is zero, stop polling */ |
575 | if (!new_delay) { | |
576 | mutex_unlock(&devfreq->lock); | |
577 | cancel_delayed_work_sync(&devfreq->work); | |
578 | return; | |
579 | } | |
580 | ||
581 | /* if current delay is zero, start polling with new delay */ | |
582 | if (!cur_delay) { | |
583 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
584 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
585 | goto out; | |
586 | } | |
587 | ||
588 | /* if current delay is greater than new delay, restart polling */ | |
589 | if (cur_delay > new_delay) { | |
590 | mutex_unlock(&devfreq->lock); | |
591 | cancel_delayed_work_sync(&devfreq->work); | |
592 | mutex_lock(&devfreq->lock); | |
593 | if (!devfreq->stop_polling) | |
594 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
6d690f77 | 595 | msecs_to_jiffies(devfreq->profile->polling_ms)); |
7e6fdd4b RV |
596 | } |
597 | out: | |
598 | mutex_unlock(&devfreq->lock); | |
599 | } | |
3a1ec2e8 | 600 | EXPORT_SYMBOL(devfreq_update_interval); |
a3c98b8b MH |
601 | |
602 | /** | |
603 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
6d690f77 | 604 | * has been changed out of devfreq framework. |
c5b4a1c1 NM |
605 | * @nb: the notifier_block (supposed to be devfreq->nb) |
606 | * @type: not used | |
607 | * @devp: not used | |
a3c98b8b MH |
608 | * |
609 | * Called by a notifier that uses devfreq->nb. | |
610 | */ | |
611 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
612 | void *devp) | |
613 | { | |
614 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
e876e710 | 615 | int err = -EINVAL; |
a3c98b8b MH |
616 | |
617 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
618 | |
619 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
e876e710 LC |
620 | if (!devfreq->scaling_min_freq) |
621 | goto out; | |
f1d981ea CC |
622 | |
623 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
e7cc792d LC |
624 | if (!devfreq->scaling_max_freq) { |
625 | devfreq->scaling_max_freq = ULONG_MAX; | |
e876e710 | 626 | goto out; |
e7cc792d | 627 | } |
e876e710 LC |
628 | |
629 | err = update_devfreq(devfreq); | |
f1d981ea | 630 | |
e876e710 | 631 | out: |
a3c98b8b | 632 | mutex_unlock(&devfreq->lock); |
e876e710 LC |
633 | if (err) |
634 | dev_err(devfreq->dev.parent, | |
635 | "failed to update frequency from OPP notifier (%d)\n", | |
636 | err); | |
a3c98b8b | 637 | |
e876e710 | 638 | return NOTIFY_OK; |
a3c98b8b MH |
639 | } |
640 | ||
05d7ae15 LC |
641 | /** |
642 | * qos_notifier_call() - Common handler for QoS constraints. | |
643 | * @devfreq: the devfreq instance. | |
644 | */ | |
645 | static int qos_notifier_call(struct devfreq *devfreq) | |
646 | { | |
647 | int err; | |
648 | ||
649 | mutex_lock(&devfreq->lock); | |
650 | err = update_devfreq(devfreq); | |
651 | mutex_unlock(&devfreq->lock); | |
652 | if (err) | |
653 | dev_err(devfreq->dev.parent, | |
654 | "failed to update frequency from PM QoS (%d)\n", | |
655 | err); | |
656 | ||
657 | return NOTIFY_OK; | |
658 | } | |
659 | ||
660 | /** | |
661 | * qos_min_notifier_call() - Callback for QoS min_freq changes. | |
662 | * @nb: Should be devfreq->nb_min | |
663 | */ | |
664 | static int qos_min_notifier_call(struct notifier_block *nb, | |
665 | unsigned long val, void *ptr) | |
666 | { | |
667 | return qos_notifier_call(container_of(nb, struct devfreq, nb_min)); | |
668 | } | |
669 | ||
670 | /** | |
671 | * qos_max_notifier_call() - Callback for QoS max_freq changes. | |
672 | * @nb: Should be devfreq->nb_max | |
673 | */ | |
674 | static int qos_max_notifier_call(struct notifier_block *nb, | |
675 | unsigned long val, void *ptr) | |
676 | { | |
677 | return qos_notifier_call(container_of(nb, struct devfreq, nb_max)); | |
678 | } | |
679 | ||
a3c98b8b | 680 | /** |
29b6968b CC |
681 | * devfreq_dev_release() - Callback for struct device to release the device. |
682 | * @dev: the devfreq device | |
683 | * | |
684 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 685 | */ |
29b6968b | 686 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 687 | { |
29b6968b | 688 | struct devfreq *devfreq = to_devfreq(dev); |
05d7ae15 | 689 | int err; |
29b6968b | 690 | |
7e6fdd4b | 691 | mutex_lock(&devfreq_list_lock); |
7e6fdd4b RV |
692 | list_del(&devfreq->node); |
693 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 694 | |
05d7ae15 LC |
695 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max, |
696 | DEV_PM_QOS_MAX_FREQUENCY); | |
697 | if (err && err != -ENOENT) | |
698 | dev_warn(dev->parent, | |
699 | "Failed to remove max_freq notifier: %d\n", err); | |
700 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min, | |
701 | DEV_PM_QOS_MIN_FREQUENCY); | |
702 | if (err && err != -ENOENT) | |
703 | dev_warn(dev->parent, | |
704 | "Failed to remove min_freq notifier: %d\n", err); | |
705 | ||
27dbc542 LC |
706 | if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) { |
707 | err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); | |
4c6abef7 | 708 | if (err < 0) |
27dbc542 LC |
709 | dev_warn(dev->parent, |
710 | "Failed to remove max_freq request: %d\n", err); | |
711 | } | |
712 | if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) { | |
713 | err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); | |
4c6abef7 | 714 | if (err < 0) |
27dbc542 LC |
715 | dev_warn(dev->parent, |
716 | "Failed to remove min_freq request: %d\n", err); | |
717 | } | |
718 | ||
a3c98b8b MH |
719 | if (devfreq->profile->exit) |
720 | devfreq->profile->exit(devfreq->dev.parent); | |
721 | ||
a3c98b8b | 722 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
723 | kfree(devfreq); |
724 | } | |
725 | ||
a3c98b8b MH |
726 | /** |
727 | * devfreq_add_device() - Add devfreq feature to the device | |
728 | * @dev: the device to add devfreq feature. | |
729 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 730 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
731 | * @data: private data for the governor. The devfreq framework does not |
732 | * touch this value. | |
733 | */ | |
734 | struct devfreq *devfreq_add_device(struct device *dev, | |
735 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 736 | const char *governor_name, |
a3c98b8b MH |
737 | void *data) |
738 | { | |
739 | struct devfreq *devfreq; | |
1b5c1be2 | 740 | struct devfreq_governor *governor; |
a3c98b8b MH |
741 | int err = 0; |
742 | ||
1b5c1be2 | 743 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
744 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
745 | return ERR_PTR(-EINVAL); | |
746 | } | |
747 | ||
7e6fdd4b RV |
748 | mutex_lock(&devfreq_list_lock); |
749 | devfreq = find_device_devfreq(dev); | |
750 | mutex_unlock(&devfreq_list_lock); | |
751 | if (!IS_ERR(devfreq)) { | |
df4d7b14 | 752 | dev_err(dev, "%s: devfreq device already exists!\n", |
9d0109be | 753 | __func__); |
7e6fdd4b RV |
754 | err = -EINVAL; |
755 | goto err_out; | |
a3c98b8b MH |
756 | } |
757 | ||
758 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
759 | if (!devfreq) { | |
a3c98b8b | 760 | err = -ENOMEM; |
3f19f08a | 761 | goto err_out; |
a3c98b8b MH |
762 | } |
763 | ||
764 | mutex_init(&devfreq->lock); | |
765 | mutex_lock(&devfreq->lock); | |
766 | devfreq->dev.parent = dev; | |
767 | devfreq->dev.class = devfreq_class; | |
768 | devfreq->dev.release = devfreq_dev_release; | |
42a6b25e | 769 | INIT_LIST_HEAD(&devfreq->node); |
a3c98b8b | 770 | devfreq->profile = profile; |
1b5c1be2 | 771 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 772 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 773 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 774 | devfreq->data = data; |
a3c98b8b MH |
775 | devfreq->nb.notifier_call = devfreq_notifier_call; |
776 | ||
0ec09ac2 CC |
777 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
778 | mutex_unlock(&devfreq->lock); | |
ea572f81 CC |
779 | err = set_freq_table(devfreq); |
780 | if (err < 0) | |
a9487917 | 781 | goto err_dev; |
0ec09ac2 CC |
782 | mutex_lock(&devfreq->lock); |
783 | } | |
784 | ||
2c2cb1e6 MK |
785 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); |
786 | if (!devfreq->scaling_min_freq) { | |
ab8f58ad CC |
787 | mutex_unlock(&devfreq->lock); |
788 | err = -EINVAL; | |
789 | goto err_dev; | |
790 | } | |
791 | ||
2c2cb1e6 MK |
792 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); |
793 | if (!devfreq->scaling_max_freq) { | |
ab8f58ad CC |
794 | mutex_unlock(&devfreq->lock); |
795 | err = -EINVAL; | |
796 | goto err_dev; | |
797 | } | |
798 | ||
83f8ca45 LL |
799 | devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); |
800 | atomic_set(&devfreq->suspend_count, 0); | |
801 | ||
66d0e797 | 802 | dev_set_name(&devfreq->dev, "%s", dev_name(dev)); |
a3c98b8b MH |
803 | err = device_register(&devfreq->dev); |
804 | if (err) { | |
7e6fdd4b | 805 | mutex_unlock(&devfreq->lock); |
2d803dc8 AY |
806 | put_device(&devfreq->dev); |
807 | goto err_out; | |
a3c98b8b MH |
808 | } |
809 | ||
1ebd0bc0 | 810 | devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, |
6d690f77 MH |
811 | array3_size(sizeof(unsigned int), |
812 | devfreq->profile->max_state, | |
813 | devfreq->profile->max_state), | |
814 | GFP_KERNEL); | |
1ebd0bc0 | 815 | if (!devfreq->stats.trans_table) { |
25846fa1 YL |
816 | mutex_unlock(&devfreq->lock); |
817 | err = -ENOMEM; | |
818 | goto err_devfreq; | |
819 | } | |
820 | ||
1ebd0bc0 | 821 | devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, |
6d690f77 | 822 | devfreq->profile->max_state, |
1ebd0bc0 | 823 | sizeof(*devfreq->stats.time_in_state), |
6d690f77 | 824 | GFP_KERNEL); |
1ebd0bc0 | 825 | if (!devfreq->stats.time_in_state) { |
25846fa1 YL |
826 | mutex_unlock(&devfreq->lock); |
827 | err = -ENOMEM; | |
828 | goto err_devfreq; | |
829 | } | |
830 | ||
1ebd0bc0 KK |
831 | devfreq->stats.total_trans = 0; |
832 | devfreq->stats.last_update = get_jiffies_64(); | |
3e1d7fb0 | 833 | |
0fe3a664 CC |
834 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
835 | ||
a3c98b8b MH |
836 | mutex_unlock(&devfreq->lock); |
837 | ||
27dbc542 LC |
838 | err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, |
839 | DEV_PM_QOS_MIN_FREQUENCY, 0); | |
840 | if (err < 0) | |
841 | goto err_devfreq; | |
842 | err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, | |
843 | DEV_PM_QOS_MAX_FREQUENCY, | |
844 | PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); | |
845 | if (err < 0) | |
846 | goto err_devfreq; | |
847 | ||
05d7ae15 LC |
848 | devfreq->nb_min.notifier_call = qos_min_notifier_call; |
849 | err = dev_pm_qos_add_notifier(devfreq->dev.parent, &devfreq->nb_min, | |
850 | DEV_PM_QOS_MIN_FREQUENCY); | |
851 | if (err) | |
852 | goto err_devfreq; | |
853 | ||
854 | devfreq->nb_max.notifier_call = qos_max_notifier_call; | |
855 | err = dev_pm_qos_add_notifier(devfreq->dev.parent, &devfreq->nb_max, | |
856 | DEV_PM_QOS_MAX_FREQUENCY); | |
857 | if (err) | |
858 | goto err_devfreq; | |
859 | ||
a3c98b8b | 860 | mutex_lock(&devfreq_list_lock); |
a3c98b8b | 861 | |
23c7b54c | 862 | governor = try_then_request_governor(devfreq->governor_name); |
73613b16 CC |
863 | if (IS_ERR(governor)) { |
864 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
865 | __func__); | |
866 | err = PTR_ERR(governor); | |
867 | goto err_init; | |
868 | } | |
869 | ||
870 | devfreq->governor = governor; | |
871 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
872 | NULL); | |
7e6fdd4b RV |
873 | if (err) { |
874 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
875 | __func__); | |
876 | goto err_init; | |
a3c98b8b | 877 | } |
23c7b54c EBS |
878 | |
879 | list_add(&devfreq->node, &devfreq_list); | |
880 | ||
0f376c9c | 881 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 882 | |
3f19f08a AL |
883 | return devfreq; |
884 | ||
a3c98b8b | 885 | err_init: |
0f376c9c | 886 | mutex_unlock(&devfreq_list_lock); |
25846fa1 | 887 | err_devfreq: |
2f061fd0 | 888 | devfreq_remove_device(devfreq); |
2d803dc8 | 889 | devfreq = NULL; |
9e14de10 | 890 | err_dev: |
8188b154 | 891 | kfree(devfreq); |
3f19f08a AL |
892 | err_out: |
893 | return ERR_PTR(err); | |
a3c98b8b | 894 | } |
7e6fdd4b | 895 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
896 | |
897 | /** | |
898 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 899 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
900 | * |
901 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
902 | */ |
903 | int devfreq_remove_device(struct devfreq *devfreq) | |
904 | { | |
905 | if (!devfreq) | |
906 | return -EINVAL; | |
907 | ||
2f061fd0 VD |
908 | if (devfreq->governor) |
909 | devfreq->governor->event_handler(devfreq, | |
910 | DEVFREQ_GOV_STOP, NULL); | |
585fc83e | 911 | device_unregister(&devfreq->dev); |
9f3bdd4f | 912 | |
a3c98b8b MH |
913 | return 0; |
914 | } | |
7e6fdd4b | 915 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 916 | |
8cd84092 CC |
917 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
918 | { | |
919 | struct devfreq **r = res; | |
920 | ||
921 | if (WARN_ON(!r || !*r)) | |
922 | return 0; | |
923 | ||
924 | return *r == data; | |
925 | } | |
926 | ||
927 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
928 | { | |
929 | devfreq_remove_device(*(struct devfreq **)res); | |
930 | } | |
931 | ||
932 | /** | |
933 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
934 | * @dev: the device to add devfreq feature. | |
935 | * @profile: device-specific profile to run devfreq. | |
936 | * @governor_name: name of the policy to choose frequency. | |
937 | * @data: private data for the governor. The devfreq framework does not | |
938 | * touch this value. | |
939 | * | |
940 | * This function manages automatically the memory of devfreq device using device | |
941 | * resource management and simplify the free operation for memory of devfreq | |
942 | * device. | |
943 | */ | |
944 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
945 | struct devfreq_dev_profile *profile, | |
946 | const char *governor_name, | |
947 | void *data) | |
948 | { | |
949 | struct devfreq **ptr, *devfreq; | |
950 | ||
951 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
952 | if (!ptr) | |
953 | return ERR_PTR(-ENOMEM); | |
954 | ||
955 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
956 | if (IS_ERR(devfreq)) { | |
957 | devres_free(ptr); | |
d1bf2d30 | 958 | return devfreq; |
8cd84092 CC |
959 | } |
960 | ||
961 | *ptr = devfreq; | |
962 | devres_add(dev, ptr); | |
963 | ||
964 | return devfreq; | |
965 | } | |
966 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
967 | ||
8f510aeb CC |
968 | #ifdef CONFIG_OF |
969 | /* | |
970 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
971 | * @dev - instance to the given device | |
972 | * @index - index into list of devfreq | |
973 | * | |
974 | * return the instance of devfreq device | |
975 | */ | |
976 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
977 | { | |
978 | struct device_node *node; | |
979 | struct devfreq *devfreq; | |
980 | ||
981 | if (!dev) | |
982 | return ERR_PTR(-EINVAL); | |
983 | ||
984 | if (!dev->of_node) | |
985 | return ERR_PTR(-EINVAL); | |
986 | ||
987 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
988 | if (!node) | |
989 | return ERR_PTR(-ENODEV); | |
990 | ||
991 | mutex_lock(&devfreq_list_lock); | |
992 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
993 | if (devfreq->dev.parent | |
994 | && devfreq->dev.parent->of_node == node) { | |
995 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 996 | of_node_put(node); |
8f510aeb CC |
997 | return devfreq; |
998 | } | |
999 | } | |
1000 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 1001 | of_node_put(node); |
8f510aeb CC |
1002 | |
1003 | return ERR_PTR(-EPROBE_DEFER); | |
1004 | } | |
1005 | #else | |
1006 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
1007 | { | |
1008 | return ERR_PTR(-ENODEV); | |
1009 | } | |
1010 | #endif /* CONFIG_OF */ | |
1011 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
1012 | ||
8cd84092 CC |
1013 | /** |
1014 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
e2fc1677 | 1015 | * @dev: the device from which to remove devfreq feature. |
8cd84092 CC |
1016 | * @devfreq: the devfreq instance to be removed |
1017 | */ | |
1018 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
1019 | { | |
1020 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
1021 | devm_devfreq_dev_match, devfreq)); | |
1022 | } | |
1023 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
1024 | ||
206c30cf RV |
1025 | /** |
1026 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
1027 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
1028 | * |
1029 | * This function is intended to be called by the pm callbacks | |
1030 | * (e.g., runtime_suspend, suspend) of the device driver that | |
1031 | * holds the devfreq. | |
206c30cf RV |
1032 | */ |
1033 | int devfreq_suspend_device(struct devfreq *devfreq) | |
1034 | { | |
83f8ca45 LL |
1035 | int ret; |
1036 | ||
a3c98b8b MH |
1037 | if (!devfreq) |
1038 | return -EINVAL; | |
1039 | ||
83f8ca45 | 1040 | if (atomic_inc_return(&devfreq->suspend_count) > 1) |
1b5c1be2 NM |
1041 | return 0; |
1042 | ||
83f8ca45 LL |
1043 | if (devfreq->governor) { |
1044 | ret = devfreq->governor->event_handler(devfreq, | |
1045 | DEVFREQ_GOV_SUSPEND, NULL); | |
1046 | if (ret) | |
1047 | return ret; | |
1048 | } | |
1049 | ||
1050 | if (devfreq->suspend_freq) { | |
e1e047ac | 1051 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1052 | ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); |
e1e047ac | 1053 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1054 | if (ret) |
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | return 0; | |
206c30cf RV |
1059 | } |
1060 | EXPORT_SYMBOL(devfreq_suspend_device); | |
1061 | ||
1062 | /** | |
1063 | * devfreq_resume_device() - Resume devfreq of a device. | |
1064 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
1065 | * |
1066 | * This function is intended to be called by the pm callbacks | |
1067 | * (e.g., runtime_resume, resume) of the device driver that | |
1068 | * holds the devfreq. | |
206c30cf RV |
1069 | */ |
1070 | int devfreq_resume_device(struct devfreq *devfreq) | |
1071 | { | |
83f8ca45 LL |
1072 | int ret; |
1073 | ||
206c30cf RV |
1074 | if (!devfreq) |
1075 | return -EINVAL; | |
1076 | ||
83f8ca45 | 1077 | if (atomic_dec_return(&devfreq->suspend_count) >= 1) |
1b5c1be2 NM |
1078 | return 0; |
1079 | ||
83f8ca45 | 1080 | if (devfreq->resume_freq) { |
e1e047ac | 1081 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1082 | ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); |
e1e047ac | 1083 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1084 | if (ret) |
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | if (devfreq->governor) { | |
1089 | ret = devfreq->governor->event_handler(devfreq, | |
1090 | DEVFREQ_GOV_RESUME, NULL); | |
1091 | if (ret) | |
1092 | return ret; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
206c30cf RV |
1096 | } |
1097 | EXPORT_SYMBOL(devfreq_resume_device); | |
1098 | ||
59031956 LL |
1099 | /** |
1100 | * devfreq_suspend() - Suspend devfreq governors and devices | |
1101 | * | |
1102 | * Called during system wide Suspend/Hibernate cycles for suspending governors | |
1103 | * and devices preserving the state for resume. On some platforms the devfreq | |
1104 | * device must have precise state (frequency) after resume in order to provide | |
1105 | * fully operating setup. | |
1106 | */ | |
1107 | void devfreq_suspend(void) | |
1108 | { | |
1109 | struct devfreq *devfreq; | |
1110 | int ret; | |
1111 | ||
1112 | mutex_lock(&devfreq_list_lock); | |
1113 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1114 | ret = devfreq_suspend_device(devfreq); | |
1115 | if (ret) | |
1116 | dev_err(&devfreq->dev, | |
1117 | "failed to suspend devfreq device\n"); | |
1118 | } | |
1119 | mutex_unlock(&devfreq_list_lock); | |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * devfreq_resume() - Resume devfreq governors and devices | |
1124 | * | |
1125 | * Called during system wide Suspend/Hibernate cycle for resuming governors and | |
1126 | * devices that are suspended with devfreq_suspend(). | |
1127 | */ | |
1128 | void devfreq_resume(void) | |
1129 | { | |
1130 | struct devfreq *devfreq; | |
1131 | int ret; | |
1132 | ||
1133 | mutex_lock(&devfreq_list_lock); | |
1134 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1135 | ret = devfreq_resume_device(devfreq); | |
1136 | if (ret) | |
1137 | dev_warn(&devfreq->dev, | |
1138 | "failed to resume devfreq device\n"); | |
1139 | } | |
1140 | mutex_unlock(&devfreq_list_lock); | |
1141 | } | |
1142 | ||
3aa173b8 NM |
1143 | /** |
1144 | * devfreq_add_governor() - Add devfreq governor | |
1145 | * @governor: the devfreq governor to be added | |
1146 | */ | |
1147 | int devfreq_add_governor(struct devfreq_governor *governor) | |
1148 | { | |
1149 | struct devfreq_governor *g; | |
1b5c1be2 | 1150 | struct devfreq *devfreq; |
3aa173b8 NM |
1151 | int err = 0; |
1152 | ||
1153 | if (!governor) { | |
1154 | pr_err("%s: Invalid parameters.\n", __func__); | |
1155 | return -EINVAL; | |
1156 | } | |
1157 | ||
1158 | mutex_lock(&devfreq_list_lock); | |
1159 | g = find_devfreq_governor(governor->name); | |
1160 | if (!IS_ERR(g)) { | |
1161 | pr_err("%s: governor %s already registered\n", __func__, | |
1162 | g->name); | |
1163 | err = -EINVAL; | |
1164 | goto err_out; | |
1165 | } | |
9f3bdd4f | 1166 | |
3aa173b8 NM |
1167 | list_add(&governor->node, &devfreq_governor_list); |
1168 | ||
1b5c1be2 NM |
1169 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1170 | int ret = 0; | |
1171 | struct device *dev = devfreq->dev.parent; | |
1172 | ||
1173 | if (!strncmp(devfreq->governor_name, governor->name, | |
1174 | DEVFREQ_NAME_LEN)) { | |
1175 | /* The following should never occur */ | |
1176 | if (devfreq->governor) { | |
1177 | dev_warn(dev, | |
1178 | "%s: Governor %s already present\n", | |
1179 | __func__, devfreq->governor->name); | |
1180 | ret = devfreq->governor->event_handler(devfreq, | |
1181 | DEVFREQ_GOV_STOP, NULL); | |
1182 | if (ret) { | |
1183 | dev_warn(dev, | |
1184 | "%s: Governor %s stop = %d\n", | |
1185 | __func__, | |
1186 | devfreq->governor->name, ret); | |
1187 | } | |
1188 | /* Fall through */ | |
1189 | } | |
1190 | devfreq->governor = governor; | |
1191 | ret = devfreq->governor->event_handler(devfreq, | |
1192 | DEVFREQ_GOV_START, NULL); | |
1193 | if (ret) { | |
1194 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
1195 | __func__, devfreq->governor->name, | |
1196 | ret); | |
1197 | } | |
a3c98b8b MH |
1198 | } |
1199 | } | |
1200 | ||
3aa173b8 NM |
1201 | err_out: |
1202 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 1203 | |
3aa173b8 NM |
1204 | return err; |
1205 | } | |
1206 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 1207 | |
3aa173b8 | 1208 | /** |
bafeb42b | 1209 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
1210 | * @governor: the devfreq governor to be removed |
1211 | */ | |
1212 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
1213 | { | |
1214 | struct devfreq_governor *g; | |
1b5c1be2 | 1215 | struct devfreq *devfreq; |
3aa173b8 NM |
1216 | int err = 0; |
1217 | ||
1218 | if (!governor) { | |
1219 | pr_err("%s: Invalid parameters.\n", __func__); | |
1220 | return -EINVAL; | |
1221 | } | |
1222 | ||
1223 | mutex_lock(&devfreq_list_lock); | |
1224 | g = find_devfreq_governor(governor->name); | |
1225 | if (IS_ERR(g)) { | |
1226 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 1227 | governor->name); |
f9c08e2a | 1228 | err = PTR_ERR(g); |
3aa173b8 NM |
1229 | goto err_out; |
1230 | } | |
1b5c1be2 NM |
1231 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1232 | int ret; | |
1233 | struct device *dev = devfreq->dev.parent; | |
1234 | ||
1235 | if (!strncmp(devfreq->governor_name, governor->name, | |
1236 | DEVFREQ_NAME_LEN)) { | |
1237 | /* we should have a devfreq governor! */ | |
1238 | if (!devfreq->governor) { | |
1239 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
1240 | __func__, governor->name); | |
1241 | continue; | |
1242 | /* Fall through */ | |
1243 | } | |
1244 | ret = devfreq->governor->event_handler(devfreq, | |
1245 | DEVFREQ_GOV_STOP, NULL); | |
1246 | if (ret) { | |
1247 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
1248 | __func__, devfreq->governor->name, | |
1249 | ret); | |
1250 | } | |
1251 | devfreq->governor = NULL; | |
1252 | } | |
1253 | } | |
3aa173b8 NM |
1254 | |
1255 | list_del(&governor->node); | |
1256 | err_out: | |
1257 | mutex_unlock(&devfreq_list_lock); | |
1258 | ||
1259 | return err; | |
a3c98b8b | 1260 | } |
3aa173b8 | 1261 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 1262 | |
2fee1a7c CC |
1263 | static ssize_t name_show(struct device *dev, |
1264 | struct device_attribute *attr, char *buf) | |
1265 | { | |
1266 | struct devfreq *devfreq = to_devfreq(dev); | |
1267 | return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent)); | |
1268 | } | |
1269 | static DEVICE_ATTR_RO(name); | |
1270 | ||
a93d6b0a | 1271 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
1272 | struct device_attribute *attr, char *buf) |
1273 | { | |
1b5c1be2 NM |
1274 | if (!to_devfreq(dev)->governor) |
1275 | return -EINVAL; | |
1276 | ||
9005b650 MH |
1277 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
1278 | } | |
1279 | ||
a93d6b0a | 1280 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
1281 | const char *buf, size_t count) |
1282 | { | |
1283 | struct devfreq *df = to_devfreq(dev); | |
1284 | int ret; | |
1285 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
bc658bef | 1286 | const struct devfreq_governor *governor, *prev_governor; |
0359d1af NM |
1287 | |
1288 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
1289 | if (ret != 1) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | mutex_lock(&devfreq_list_lock); | |
23c7b54c | 1293 | governor = try_then_request_governor(str_governor); |
0359d1af NM |
1294 | if (IS_ERR(governor)) { |
1295 | ret = PTR_ERR(governor); | |
1296 | goto out; | |
1297 | } | |
14a21e7b TJ |
1298 | if (df->governor == governor) { |
1299 | ret = 0; | |
0359d1af | 1300 | goto out; |
63f1e05f GS |
1301 | } else if ((df->governor && df->governor->immutable) || |
1302 | governor->immutable) { | |
bcf23c79 CC |
1303 | ret = -EINVAL; |
1304 | goto out; | |
14a21e7b | 1305 | } |
0359d1af NM |
1306 | |
1307 | if (df->governor) { | |
1308 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1309 | if (ret) { | |
1310 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1311 | __func__, df->governor->name, ret); | |
1312 | goto out; | |
1313 | } | |
1314 | } | |
bc658bef | 1315 | prev_governor = df->governor; |
0359d1af NM |
1316 | df->governor = governor; |
1317 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
1318 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
bc658bef | 1319 | if (ret) { |
0359d1af NM |
1320 | dev_warn(dev, "%s: Governor %s not started(%d)\n", |
1321 | __func__, df->governor->name, ret); | |
bc658bef SK |
1322 | df->governor = prev_governor; |
1323 | strncpy(df->governor_name, prev_governor->name, | |
1324 | DEVFREQ_NAME_LEN); | |
1325 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1326 | if (ret) { | |
1327 | dev_err(dev, | |
1328 | "%s: reverting to Governor %s failed (%d)\n", | |
1329 | __func__, df->governor_name, ret); | |
1330 | df->governor = NULL; | |
1331 | } | |
1332 | } | |
0359d1af NM |
1333 | out: |
1334 | mutex_unlock(&devfreq_list_lock); | |
1335 | ||
1336 | if (!ret) | |
1337 | ret = count; | |
1338 | return ret; | |
1339 | } | |
a93d6b0a GKH |
1340 | static DEVICE_ATTR_RW(governor); |
1341 | ||
1342 | static ssize_t available_governors_show(struct device *d, | |
1343 | struct device_attribute *attr, | |
1344 | char *buf) | |
50a5b33e | 1345 | { |
bcf23c79 | 1346 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1347 | ssize_t count = 0; |
1348 | ||
1349 | mutex_lock(&devfreq_list_lock); | |
bcf23c79 CC |
1350 | |
1351 | /* | |
1352 | * The devfreq with immutable governor (e.g., passive) shows | |
1353 | * only own governor. | |
1354 | */ | |
d68adc8f | 1355 | if (df->governor && df->governor->immutable) { |
bcf23c79 | 1356 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, |
6d690f77 | 1357 | "%s ", df->governor_name); |
bcf23c79 CC |
1358 | /* |
1359 | * The devfreq device shows the registered governor except for | |
1360 | * immutable governors such as passive governor . | |
1361 | */ | |
1362 | } else { | |
1363 | struct devfreq_governor *governor; | |
1364 | ||
1365 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
1366 | if (governor->immutable) | |
1367 | continue; | |
1368 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1369 | "%s ", governor->name); | |
1370 | } | |
1371 | } | |
1372 | ||
50a5b33e NM |
1373 | mutex_unlock(&devfreq_list_lock); |
1374 | ||
1375 | /* Truncate the trailing space */ | |
1376 | if (count) | |
1377 | count--; | |
1378 | ||
1379 | count += sprintf(&buf[count], "\n"); | |
1380 | ||
1381 | return count; | |
1382 | } | |
a93d6b0a | 1383 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1384 | |
a93d6b0a GKH |
1385 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1386 | char *buf) | |
7f98a905 RV |
1387 | { |
1388 | unsigned long freq; | |
1389 | struct devfreq *devfreq = to_devfreq(dev); | |
1390 | ||
1391 | if (devfreq->profile->get_cur_freq && | |
1392 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
9d0109be | 1393 | return sprintf(buf, "%lu\n", freq); |
7f98a905 RV |
1394 | |
1395 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1396 | } | |
a93d6b0a | 1397 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1398 | |
a93d6b0a GKH |
1399 | static ssize_t target_freq_show(struct device *dev, |
1400 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1401 | { |
1402 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1403 | } | |
a93d6b0a | 1404 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1405 | |
a93d6b0a | 1406 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1407 | struct device_attribute *attr, char *buf) |
1408 | { | |
1409 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1410 | } | |
1411 | ||
a93d6b0a | 1412 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1413 | struct device_attribute *attr, |
1414 | const char *buf, size_t count) | |
1415 | { | |
1416 | struct devfreq *df = to_devfreq(dev); | |
1417 | unsigned int value; | |
1418 | int ret; | |
1419 | ||
1b5c1be2 NM |
1420 | if (!df->governor) |
1421 | return -EINVAL; | |
1422 | ||
9005b650 MH |
1423 | ret = sscanf(buf, "%u", &value); |
1424 | if (ret != 1) | |
12e26265 | 1425 | return -EINVAL; |
9005b650 | 1426 | |
3a1ec2e8 | 1427 | df->governor->event_handler(df, DEVFREQ_GOV_UPDATE_INTERVAL, &value); |
9005b650 MH |
1428 | ret = count; |
1429 | ||
9005b650 MH |
1430 | return ret; |
1431 | } | |
a93d6b0a | 1432 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1433 | |
a93d6b0a | 1434 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1435 | const char *buf, size_t count) |
1436 | { | |
1437 | struct devfreq *df = to_devfreq(dev); | |
1438 | unsigned long value; | |
1439 | int ret; | |
6530b9de | 1440 | |
27dbc542 LC |
1441 | /* |
1442 | * Protect against theoretical sysfs writes between | |
1443 | * device_add and dev_pm_qos_add_request | |
1444 | */ | |
1445 | if (!dev_pm_qos_request_active(&df->user_min_freq_req)) | |
1446 | return -EAGAIN; | |
1447 | ||
6530b9de MH |
1448 | ret = sscanf(buf, "%lu", &value); |
1449 | if (ret != 1) | |
12e26265 | 1450 | return -EINVAL; |
6530b9de | 1451 | |
27dbc542 LC |
1452 | /* Round down to kHz for PM QoS */ |
1453 | ret = dev_pm_qos_update_request(&df->user_min_freq_req, | |
1454 | value / HZ_PER_KHZ); | |
1455 | if (ret < 0) | |
1456 | return ret; | |
46cecc0b LC |
1457 | |
1458 | return count; | |
6530b9de MH |
1459 | } |
1460 | ||
1051e2c3 CC |
1461 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1462 | char *buf) | |
1463 | { | |
f1d981ea | 1464 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1465 | unsigned long min_freq, max_freq; |
1466 | ||
1467 | mutex_lock(&df->lock); | |
1468 | get_freq_range(df, &min_freq, &max_freq); | |
1469 | mutex_unlock(&df->lock); | |
f1d981ea | 1470 | |
46cecc0b | 1471 | return sprintf(buf, "%lu\n", min_freq); |
1051e2c3 | 1472 | } |
f9002b16 | 1473 | static DEVICE_ATTR_RW(min_freq); |
1051e2c3 | 1474 | |
a93d6b0a | 1475 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1476 | const char *buf, size_t count) |
1477 | { | |
1478 | struct devfreq *df = to_devfreq(dev); | |
1479 | unsigned long value; | |
1480 | int ret; | |
6530b9de | 1481 | |
27dbc542 LC |
1482 | /* |
1483 | * Protect against theoretical sysfs writes between | |
1484 | * device_add and dev_pm_qos_add_request | |
1485 | */ | |
1486 | if (!dev_pm_qos_request_active(&df->user_max_freq_req)) | |
1487 | return -EINVAL; | |
1488 | ||
6530b9de MH |
1489 | ret = sscanf(buf, "%lu", &value); |
1490 | if (ret != 1) | |
12e26265 | 1491 | return -EINVAL; |
6530b9de | 1492 | |
27dbc542 LC |
1493 | /* |
1494 | * PM QoS frequencies are in kHz so we need to convert. Convert by | |
1495 | * rounding upwards so that the acceptable interval never shrinks. | |
1496 | * | |
1497 | * For example if the user writes "666666666" to sysfs this value will | |
1498 | * be converted to 666667 kHz and back to 666667000 Hz before an OPP | |
1499 | * lookup, this ensures that an OPP of 666666666Hz is still accepted. | |
1500 | * | |
1501 | * A value of zero means "no limit". | |
1502 | */ | |
1503 | if (value) | |
1504 | value = DIV_ROUND_UP(value, HZ_PER_KHZ); | |
1505 | else | |
1506 | value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; | |
6530b9de | 1507 | |
27dbc542 LC |
1508 | ret = dev_pm_qos_update_request(&df->user_max_freq_req, value); |
1509 | if (ret < 0) | |
1510 | return ret; | |
46cecc0b LC |
1511 | |
1512 | return count; | |
6530b9de MH |
1513 | } |
1514 | ||
1051e2c3 CC |
1515 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1516 | char *buf) | |
1517 | { | |
f1d981ea | 1518 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1519 | unsigned long min_freq, max_freq; |
1520 | ||
1521 | mutex_lock(&df->lock); | |
1522 | get_freq_range(df, &min_freq, &max_freq); | |
1523 | mutex_unlock(&df->lock); | |
f1d981ea | 1524 | |
46cecc0b | 1525 | return sprintf(buf, "%lu\n", max_freq); |
6530b9de | 1526 | } |
a93d6b0a | 1527 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1528 | |
a93d6b0a GKH |
1529 | static ssize_t available_frequencies_show(struct device *d, |
1530 | struct device_attribute *attr, | |
1531 | char *buf) | |
d287de85 NM |
1532 | { |
1533 | struct devfreq *df = to_devfreq(d); | |
d287de85 | 1534 | ssize_t count = 0; |
416b46a2 | 1535 | int i; |
d287de85 | 1536 | |
416b46a2 | 1537 | mutex_lock(&df->lock); |
d287de85 | 1538 | |
416b46a2 | 1539 | for (i = 0; i < df->profile->max_state; i++) |
d287de85 | 1540 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
416b46a2 | 1541 | "%lu ", df->profile->freq_table[i]); |
d287de85 | 1542 | |
416b46a2 | 1543 | mutex_unlock(&df->lock); |
d287de85 NM |
1544 | /* Truncate the trailing space */ |
1545 | if (count) | |
1546 | count--; | |
1547 | ||
1548 | count += sprintf(&buf[count], "\n"); | |
1549 | ||
1550 | return count; | |
1551 | } | |
a93d6b0a | 1552 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1553 | |
a93d6b0a GKH |
1554 | static ssize_t trans_stat_show(struct device *dev, |
1555 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1556 | { |
1557 | struct devfreq *devfreq = to_devfreq(dev); | |
1558 | ssize_t len; | |
39688ce6 | 1559 | int i, j; |
e552bbaf JL |
1560 | unsigned int max_state = devfreq->profile->max_state; |
1561 | ||
34bd3220 MH |
1562 | if (max_state == 0) |
1563 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1564 | |
2abb0d52 LC |
1565 | mutex_lock(&devfreq->lock); |
1566 | if (!devfreq->stop_polling && | |
1567 | devfreq_update_status(devfreq, devfreq->previous_freq)) { | |
1568 | mutex_unlock(&devfreq->lock); | |
1569 | return 0; | |
1570 | } | |
1571 | mutex_unlock(&devfreq->lock); | |
1572 | ||
d7df1e46 CC |
1573 | len = sprintf(buf, " From : To\n"); |
1574 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1575 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1576 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1577 | devfreq->profile->freq_table[i]); |
1578 | ||
1579 | len += sprintf(buf + len, " time(ms)\n"); | |
1580 | ||
1581 | for (i = 0; i < max_state; i++) { | |
1582 | if (devfreq->profile->freq_table[i] | |
1583 | == devfreq->previous_freq) { | |
1584 | len += sprintf(buf + len, "*"); | |
1585 | } else { | |
1586 | len += sprintf(buf + len, " "); | |
1587 | } | |
d7df1e46 | 1588 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1589 | devfreq->profile->freq_table[i]); |
1590 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1591 | len += sprintf(buf + len, "%10u", |
1ebd0bc0 KK |
1592 | devfreq->stats.trans_table[(i * max_state) + j]); |
1593 | ||
b76b3479 | 1594 | len += sprintf(buf + len, "%10llu\n", (u64) |
1ebd0bc0 | 1595 | jiffies64_to_msecs(devfreq->stats.time_in_state[i])); |
e552bbaf JL |
1596 | } |
1597 | ||
1598 | len += sprintf(buf + len, "Total transition : %u\n", | |
1ebd0bc0 | 1599 | devfreq->stats.total_trans); |
e552bbaf JL |
1600 | return len; |
1601 | } | |
14a34396 KK |
1602 | |
1603 | static ssize_t trans_stat_store(struct device *dev, | |
1604 | struct device_attribute *attr, | |
1605 | const char *buf, size_t count) | |
1606 | { | |
1607 | struct devfreq *df = to_devfreq(dev); | |
1608 | int err, value; | |
1609 | ||
1610 | if (df->profile->max_state == 0) | |
1611 | return count; | |
1612 | ||
1613 | err = kstrtoint(buf, 10, &value); | |
1614 | if (err || value != 0) | |
1615 | return -EINVAL; | |
1616 | ||
1617 | mutex_lock(&df->lock); | |
1ebd0bc0 KK |
1618 | memset(df->stats.time_in_state, 0, (df->profile->max_state * |
1619 | sizeof(*df->stats.time_in_state))); | |
1620 | memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), | |
14a34396 KK |
1621 | df->profile->max_state, |
1622 | df->profile->max_state)); | |
1ebd0bc0 KK |
1623 | df->stats.total_trans = 0; |
1624 | df->stats.last_update = get_jiffies_64(); | |
14a34396 KK |
1625 | mutex_unlock(&df->lock); |
1626 | ||
1627 | return count; | |
1628 | } | |
1629 | static DEVICE_ATTR_RW(trans_stat); | |
a93d6b0a GKH |
1630 | |
1631 | static struct attribute *devfreq_attrs[] = { | |
2fee1a7c | 1632 | &dev_attr_name.attr, |
a93d6b0a GKH |
1633 | &dev_attr_governor.attr, |
1634 | &dev_attr_available_governors.attr, | |
1635 | &dev_attr_cur_freq.attr, | |
1636 | &dev_attr_available_frequencies.attr, | |
1637 | &dev_attr_target_freq.attr, | |
1638 | &dev_attr_polling_interval.attr, | |
1639 | &dev_attr_min_freq.attr, | |
1640 | &dev_attr_max_freq.attr, | |
1641 | &dev_attr_trans_stat.attr, | |
1642 | NULL, | |
9005b650 | 1643 | }; |
a93d6b0a | 1644 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1645 | |
490a421b CC |
1646 | /** |
1647 | * devfreq_summary_show() - Show the summary of the devfreq devices | |
1648 | * @s: seq_file instance to show the summary of devfreq devices | |
1649 | * @data: not used | |
1650 | * | |
1651 | * Show the summary of the devfreq devices via 'devfreq_summary' debugfs file. | |
1652 | * It helps that user can know the detailed information of the devfreq devices. | |
1653 | * | |
1654 | * Return 0 always because it shows the information without any data change. | |
1655 | */ | |
1656 | static int devfreq_summary_show(struct seq_file *s, void *data) | |
1657 | { | |
1658 | struct devfreq *devfreq; | |
1659 | struct devfreq *p_devfreq = NULL; | |
1660 | unsigned long cur_freq, min_freq, max_freq; | |
1661 | unsigned int polling_ms; | |
1662 | ||
1663 | seq_printf(s, "%-30s %-10s %-10s %-15s %10s %12s %12s %12s\n", | |
1664 | "dev_name", | |
1665 | "dev", | |
1666 | "parent_dev", | |
1667 | "governor", | |
1668 | "polling_ms", | |
1669 | "cur_freq_Hz", | |
1670 | "min_freq_Hz", | |
1671 | "max_freq_Hz"); | |
1672 | seq_printf(s, "%30s %10s %10s %15s %10s %12s %12s %12s\n", | |
1673 | "------------------------------", | |
1674 | "----------", | |
1675 | "----------", | |
1676 | "---------------", | |
1677 | "----------", | |
1678 | "------------", | |
1679 | "------------", | |
1680 | "------------"); | |
1681 | ||
1682 | mutex_lock(&devfreq_list_lock); | |
1683 | ||
1684 | list_for_each_entry_reverse(devfreq, &devfreq_list, node) { | |
1685 | #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) | |
1686 | if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, | |
1687 | DEVFREQ_NAME_LEN)) { | |
1688 | struct devfreq_passive_data *data = devfreq->data; | |
1689 | ||
1690 | if (data) | |
1691 | p_devfreq = data->parent; | |
1692 | } else { | |
1693 | p_devfreq = NULL; | |
1694 | } | |
1695 | #endif | |
1696 | ||
1697 | mutex_lock(&devfreq->lock); | |
1698 | cur_freq = devfreq->previous_freq, | |
1699 | get_freq_range(devfreq, &min_freq, &max_freq); | |
1700 | polling_ms = devfreq->profile->polling_ms, | |
1701 | mutex_unlock(&devfreq->lock); | |
1702 | ||
1703 | seq_printf(s, | |
1704 | "%-30s %-10s %-10s %-15s %10d %12ld %12ld %12ld\n", | |
1705 | dev_name(devfreq->dev.parent), | |
1706 | dev_name(&devfreq->dev), | |
1707 | p_devfreq ? dev_name(&p_devfreq->dev) : "null", | |
1708 | devfreq->governor_name, | |
1709 | polling_ms, | |
1710 | cur_freq, | |
1711 | min_freq, | |
1712 | max_freq); | |
1713 | } | |
1714 | ||
1715 | mutex_unlock(&devfreq_list_lock); | |
1716 | ||
1717 | return 0; | |
1718 | } | |
1719 | DEFINE_SHOW_ATTRIBUTE(devfreq_summary); | |
1720 | ||
a3c98b8b MH |
1721 | static int __init devfreq_init(void) |
1722 | { | |
1723 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1724 | if (IS_ERR(devfreq_class)) { | |
1725 | pr_err("%s: couldn't create class\n", __FILE__); | |
1726 | return PTR_ERR(devfreq_class); | |
1727 | } | |
7e6fdd4b RV |
1728 | |
1729 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1730 | if (!devfreq_wq) { |
7e6fdd4b RV |
1731 | class_destroy(devfreq_class); |
1732 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1733 | return -ENOMEM; |
7e6fdd4b | 1734 | } |
a93d6b0a | 1735 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1736 | |
490a421b CC |
1737 | devfreq_debugfs = debugfs_create_dir("devfreq", NULL); |
1738 | debugfs_create_file("devfreq_summary", 0444, | |
1739 | devfreq_debugfs, NULL, | |
1740 | &devfreq_summary_fops); | |
1741 | ||
a3c98b8b MH |
1742 | return 0; |
1743 | } | |
1744 | subsys_initcall(devfreq_init); | |
1745 | ||
a3c98b8b | 1746 | /* |
4091fb95 | 1747 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1748 | * OPP framework. |
1749 | */ | |
1750 | ||
1751 | /** | |
1752 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1753 | * freq value given to target callback. | |
c5b4a1c1 NM |
1754 | * @dev: The devfreq user device. (parent of devfreq) |
1755 | * @freq: The frequency given to target function | |
1756 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1757 | * |
8a31d9d9 VK |
1758 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1759 | * use. | |
a3c98b8b | 1760 | */ |
47d43ba7 NM |
1761 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1762 | unsigned long *freq, | |
1763 | u32 flags) | |
a3c98b8b | 1764 | { |
47d43ba7 | 1765 | struct dev_pm_opp *opp; |
a3c98b8b | 1766 | |
ab5f299f MH |
1767 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1768 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1769 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1770 | |
1771 | /* If not available, use the closest opp */ | |
0779726c | 1772 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1773 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1774 | } else { |
1775 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1776 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1777 | |
1778 | /* If not available, use the closest opp */ | |
0779726c | 1779 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1780 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1781 | } |
1782 | ||
a3c98b8b MH |
1783 | return opp; |
1784 | } | |
bd7e9277 | 1785 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1786 | |
1787 | /** | |
1788 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
6d690f77 MH |
1789 | * for any changes in the OPP availability |
1790 | * changes | |
c5b4a1c1 NM |
1791 | * @dev: The devfreq user device. (parent of devfreq) |
1792 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1793 | */ |
1794 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1795 | { | |
dc2c9ad5 | 1796 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 1797 | } |
bd7e9277 | 1798 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1799 | |
1800 | /** | |
1801 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
6d690f77 MH |
1802 | * notified for any changes in the OPP |
1803 | * availability changes anymore. | |
c5b4a1c1 NM |
1804 | * @dev: The devfreq user device. (parent of devfreq) |
1805 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1806 | * |
1807 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1808 | * devfreq_recommended_opp is used. | |
1809 | */ | |
1810 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1811 | { | |
dc2c9ad5 | 1812 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 1813 | } |
bd7e9277 | 1814 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1815 | |
d5b040d0 CC |
1816 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1817 | { | |
1818 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1819 | } | |
1820 | ||
1821 | /** | |
6d690f77 MH |
1822 | * devm_devfreq_register_opp_notifier() - Resource-managed |
1823 | * devfreq_register_opp_notifier() | |
d5b040d0 CC |
1824 | * @dev: The devfreq user device. (parent of devfreq) |
1825 | * @devfreq: The devfreq object. | |
1826 | */ | |
1827 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1828 | struct devfreq *devfreq) | |
1829 | { | |
1830 | struct devfreq **ptr; | |
1831 | int ret; | |
1832 | ||
1833 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1834 | if (!ptr) | |
1835 | return -ENOMEM; | |
1836 | ||
1837 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1838 | if (ret) { | |
1839 | devres_free(ptr); | |
1840 | return ret; | |
1841 | } | |
1842 | ||
1843 | *ptr = devfreq; | |
1844 | devres_add(dev, ptr); | |
1845 | ||
1846 | return 0; | |
1847 | } | |
1848 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1849 | ||
1850 | /** | |
6d690f77 MH |
1851 | * devm_devfreq_unregister_opp_notifier() - Resource-managed |
1852 | * devfreq_unregister_opp_notifier() | |
d5b040d0 CC |
1853 | * @dev: The devfreq user device. (parent of devfreq) |
1854 | * @devfreq: The devfreq object. | |
1855 | */ | |
1856 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1857 | struct devfreq *devfreq) | |
1858 | { | |
1859 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1860 | devm_devfreq_dev_match, devfreq)); | |
1861 | } | |
1862 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1863 | ||
0fe3a664 CC |
1864 | /** |
1865 | * devfreq_register_notifier() - Register a driver with devfreq | |
1866 | * @devfreq: The devfreq object. | |
1867 | * @nb: The notifier block to register. | |
1868 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1869 | */ | |
1870 | int devfreq_register_notifier(struct devfreq *devfreq, | |
6d690f77 MH |
1871 | struct notifier_block *nb, |
1872 | unsigned int list) | |
0fe3a664 CC |
1873 | { |
1874 | int ret = 0; | |
1875 | ||
1876 | if (!devfreq) | |
1877 | return -EINVAL; | |
1878 | ||
1879 | switch (list) { | |
1880 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1881 | ret = srcu_notifier_chain_register( | |
1882 | &devfreq->transition_notifier_list, nb); | |
1883 | break; | |
1884 | default: | |
1885 | ret = -EINVAL; | |
1886 | } | |
1887 | ||
1888 | return ret; | |
1889 | } | |
1890 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1891 | ||
1892 | /* | |
1893 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1894 | * @devfreq: The devfreq object. | |
1895 | * @nb: The notifier block to be unregistered. | |
1896 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1897 | */ | |
1898 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1899 | struct notifier_block *nb, | |
1900 | unsigned int list) | |
1901 | { | |
1902 | int ret = 0; | |
1903 | ||
1904 | if (!devfreq) | |
1905 | return -EINVAL; | |
1906 | ||
1907 | switch (list) { | |
1908 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1909 | ret = srcu_notifier_chain_unregister( | |
1910 | &devfreq->transition_notifier_list, nb); | |
1911 | break; | |
1912 | default: | |
1913 | ret = -EINVAL; | |
1914 | } | |
1915 | ||
1916 | return ret; | |
1917 | } | |
1918 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1919 | ||
1920 | struct devfreq_notifier_devres { | |
1921 | struct devfreq *devfreq; | |
1922 | struct notifier_block *nb; | |
1923 | unsigned int list; | |
1924 | }; | |
1925 | ||
1926 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1927 | { | |
1928 | struct devfreq_notifier_devres *this = res; | |
1929 | ||
1930 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1931 | } | |
1932 | ||
1933 | /** | |
1934 | * devm_devfreq_register_notifier() | |
54cb5740 | 1935 | * - Resource-managed devfreq_register_notifier() |
0fe3a664 CC |
1936 | * @dev: The devfreq user device. (parent of devfreq) |
1937 | * @devfreq: The devfreq object. | |
1938 | * @nb: The notifier block to be unregistered. | |
1939 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1940 | */ | |
1941 | int devm_devfreq_register_notifier(struct device *dev, | |
1942 | struct devfreq *devfreq, | |
1943 | struct notifier_block *nb, | |
1944 | unsigned int list) | |
1945 | { | |
1946 | struct devfreq_notifier_devres *ptr; | |
1947 | int ret; | |
1948 | ||
1949 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1950 | GFP_KERNEL); | |
1951 | if (!ptr) | |
1952 | return -ENOMEM; | |
1953 | ||
1954 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1955 | if (ret) { | |
1956 | devres_free(ptr); | |
1957 | return ret; | |
1958 | } | |
1959 | ||
1960 | ptr->devfreq = devfreq; | |
1961 | ptr->nb = nb; | |
1962 | ptr->list = list; | |
1963 | devres_add(dev, ptr); | |
1964 | ||
1965 | return 0; | |
1966 | } | |
1967 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1968 | ||
1969 | /** | |
1970 | * devm_devfreq_unregister_notifier() | |
54cb5740 | 1971 | * - Resource-managed devfreq_unregister_notifier() |
0fe3a664 CC |
1972 | * @dev: The devfreq user device. (parent of devfreq) |
1973 | * @devfreq: The devfreq object. | |
1974 | * @nb: The notifier block to be unregistered. | |
1975 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1976 | */ | |
1977 | void devm_devfreq_unregister_notifier(struct device *dev, | |
6d690f77 MH |
1978 | struct devfreq *devfreq, |
1979 | struct notifier_block *nb, | |
1980 | unsigned int list) | |
0fe3a664 CC |
1981 | { |
1982 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1983 | devm_devfreq_dev_match, devfreq)); | |
1984 | } | |
1985 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |