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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a3c98b8b MH |
2 | /* |
3 | * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework | |
4 | * for Non-CPU Devices. | |
5 | * | |
6 | * Copyright (C) 2011 Samsung Electronics | |
7 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
a3c98b8b MH |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
23c7b54c | 11 | #include <linux/kmod.h> |
a3c98b8b | 12 | #include <linux/sched.h> |
490a421b | 13 | #include <linux/debugfs.h> |
1224451b | 14 | #include <linux/devfreq_cooling.h> |
a3c98b8b MH |
15 | #include <linux/errno.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/init.h> | |
417dc4bb | 18 | #include <linux/export.h> |
a3c98b8b | 19 | #include <linux/slab.h> |
952f6d13 | 20 | #include <linux/stat.h> |
e4db1c74 | 21 | #include <linux/pm_opp.h> |
a3c98b8b MH |
22 | #include <linux/devfreq.h> |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/printk.h> | |
27 | #include <linux/hrtimer.h> | |
8f510aeb | 28 | #include <linux/of.h> |
05d7ae15 | 29 | #include <linux/pm_qos.h> |
04c8984a | 30 | #include <linux/units.h> |
a3c98b8b MH |
31 | #include "governor.h" |
32 | ||
cf451adf LL |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/devfreq.h> | |
35 | ||
0dd25a0d | 36 | #define IS_SUPPORTED_FLAG(f, name) ((f & DEVFREQ_GOV_FLAG_##name) ? true : false) |
5f1a9066 | 37 | #define IS_SUPPORTED_ATTR(f, name) ((f & DEVFREQ_GOV_ATTR_##name) ? true : false) |
05d7ae15 | 38 | |
1a1357ea | 39 | static struct class *devfreq_class; |
490a421b | 40 | static struct dentry *devfreq_debugfs; |
a3c98b8b MH |
41 | |
42 | /* | |
7e6fdd4b RV |
43 | * devfreq core provides delayed work based load monitoring helper |
44 | * functions. Governors can use these or can implement their own | |
45 | * monitoring mechanism. | |
a3c98b8b | 46 | */ |
a3c98b8b | 47 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 48 | |
3aa173b8 NM |
49 | /* The list of all device-devfreq governors */ |
50 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
51 | /* The list of all device-devfreq */ |
52 | static LIST_HEAD(devfreq_list); | |
53 | static DEFINE_MUTEX(devfreq_list_lock); | |
54 | ||
4dc3bab8 CC |
55 | static const char timer_name[][DEVFREQ_NAME_LEN] = { |
56 | [DEVFREQ_TIMER_DEFERRABLE] = { "deferrable" }, | |
57 | [DEVFREQ_TIMER_DELAYED] = { "delayed" }, | |
58 | }; | |
59 | ||
a3c98b8b MH |
60 | /** |
61 | * find_device_devfreq() - find devfreq struct using device pointer | |
62 | * @dev: device pointer used to lookup device devfreq. | |
63 | * | |
64 | * Search the list of device devfreqs and return the matched device's | |
65 | * devfreq info. devfreq_list_lock should be held by the caller. | |
66 | */ | |
67 | static struct devfreq *find_device_devfreq(struct device *dev) | |
68 | { | |
69 | struct devfreq *tmp_devfreq; | |
70 | ||
8fc0e48e KK |
71 | lockdep_assert_held(&devfreq_list_lock); |
72 | ||
9348da2f | 73 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
74 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
75 | return ERR_PTR(-EINVAL); | |
76 | } | |
a3c98b8b MH |
77 | |
78 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
79 | if (tmp_devfreq->dev.parent == dev) | |
80 | return tmp_devfreq; | |
81 | } | |
82 | ||
83 | return ERR_PTR(-ENODEV); | |
84 | } | |
85 | ||
ab8f58ad CC |
86 | static unsigned long find_available_min_freq(struct devfreq *devfreq) |
87 | { | |
88 | struct dev_pm_opp *opp; | |
89 | unsigned long min_freq = 0; | |
90 | ||
91 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); | |
92 | if (IS_ERR(opp)) | |
93 | min_freq = 0; | |
94 | else | |
95 | dev_pm_opp_put(opp); | |
96 | ||
97 | return min_freq; | |
98 | } | |
99 | ||
100 | static unsigned long find_available_max_freq(struct devfreq *devfreq) | |
101 | { | |
102 | struct dev_pm_opp *opp; | |
103 | unsigned long max_freq = ULONG_MAX; | |
104 | ||
105 | opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); | |
106 | if (IS_ERR(opp)) | |
107 | max_freq = 0; | |
108 | else | |
109 | dev_pm_opp_put(opp); | |
110 | ||
111 | return max_freq; | |
112 | } | |
113 | ||
46cecc0b | 114 | /** |
713472e5 | 115 | * devfreq_get_freq_range() - Get the current freq range |
46cecc0b LC |
116 | * @devfreq: the devfreq instance |
117 | * @min_freq: the min frequency | |
118 | * @max_freq: the max frequency | |
119 | * | |
120 | * This takes into consideration all constraints. | |
121 | */ | |
713472e5 CC |
122 | void devfreq_get_freq_range(struct devfreq *devfreq, |
123 | unsigned long *min_freq, | |
124 | unsigned long *max_freq) | |
46cecc0b | 125 | { |
b5d281f6 | 126 | unsigned long *freq_table = devfreq->freq_table; |
05d7ae15 | 127 | s32 qos_min_freq, qos_max_freq; |
46cecc0b LC |
128 | |
129 | lockdep_assert_held(&devfreq->lock); | |
130 | ||
131 | /* | |
132 | * Initialize minimum/maximum frequency from freq table. | |
133 | * The devfreq drivers can initialize this in either ascending or | |
134 | * descending order and devfreq core supports both. | |
135 | */ | |
b5d281f6 | 136 | if (freq_table[0] < freq_table[devfreq->max_state - 1]) { |
46cecc0b | 137 | *min_freq = freq_table[0]; |
b5d281f6 | 138 | *max_freq = freq_table[devfreq->max_state - 1]; |
46cecc0b | 139 | } else { |
b5d281f6 | 140 | *min_freq = freq_table[devfreq->max_state - 1]; |
46cecc0b LC |
141 | *max_freq = freq_table[0]; |
142 | } | |
143 | ||
05d7ae15 LC |
144 | /* Apply constraints from PM QoS */ |
145 | qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
146 | DEV_PM_QOS_MIN_FREQUENCY); | |
147 | qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent, | |
148 | DEV_PM_QOS_MAX_FREQUENCY); | |
149 | *min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq); | |
150 | if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE) | |
151 | *max_freq = min(*max_freq, | |
152 | (unsigned long)HZ_PER_KHZ * qos_max_freq); | |
153 | ||
46cecc0b LC |
154 | /* Apply constraints from OPP interface */ |
155 | *min_freq = max(*min_freq, devfreq->scaling_min_freq); | |
156 | *max_freq = min(*max_freq, devfreq->scaling_max_freq); | |
157 | ||
158 | if (*min_freq > *max_freq) | |
159 | *min_freq = *max_freq; | |
160 | } | |
713472e5 | 161 | EXPORT_SYMBOL(devfreq_get_freq_range); |
46cecc0b | 162 | |
e552bbaf JL |
163 | /** |
164 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
165 | * @devfreq: the devfreq instance | |
166 | * @freq: the target frequency | |
167 | */ | |
168 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
169 | { | |
170 | int lev; | |
171 | ||
b5d281f6 CM |
172 | for (lev = 0; lev < devfreq->max_state; lev++) |
173 | if (freq == devfreq->freq_table[lev]) | |
e552bbaf JL |
174 | return lev; |
175 | ||
176 | return -EINVAL; | |
177 | } | |
178 | ||
ea572f81 | 179 | static int set_freq_table(struct devfreq *devfreq) |
0ec09ac2 | 180 | { |
0ec09ac2 CC |
181 | struct dev_pm_opp *opp; |
182 | unsigned long freq; | |
183 | int i, count; | |
184 | ||
185 | /* Initialize the freq_table from OPP table */ | |
186 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
187 | if (count <= 0) | |
ea572f81 | 188 | return -EINVAL; |
0ec09ac2 | 189 | |
b5d281f6 CM |
190 | devfreq->max_state = count; |
191 | devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, | |
192 | devfreq->max_state, | |
193 | sizeof(*devfreq->freq_table), | |
194 | GFP_KERNEL); | |
195 | if (!devfreq->freq_table) | |
ea572f81 | 196 | return -ENOMEM; |
0ec09ac2 | 197 | |
b5d281f6 | 198 | for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { |
0ec09ac2 CC |
199 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); |
200 | if (IS_ERR(opp)) { | |
b5d281f6 | 201 | devm_kfree(devfreq->dev.parent, devfreq->freq_table); |
ea572f81 | 202 | return PTR_ERR(opp); |
0ec09ac2 | 203 | } |
8a31d9d9 | 204 | dev_pm_opp_put(opp); |
b5d281f6 | 205 | devfreq->freq_table[i] = freq; |
0ec09ac2 | 206 | } |
ea572f81 CC |
207 | |
208 | return 0; | |
0ec09ac2 CC |
209 | } |
210 | ||
e552bbaf JL |
211 | /** |
212 | * devfreq_update_status() - Update statistics of devfreq behavior | |
213 | * @devfreq: the devfreq instance | |
214 | * @freq: the update target frequency | |
215 | */ | |
30582c25 | 216 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 217 | { |
e35d35a1 | 218 | int lev, prev_lev, ret = 0; |
b76b3479 | 219 | u64 cur_time; |
e552bbaf | 220 | |
2abb0d52 | 221 | lockdep_assert_held(&devfreq->lock); |
b76b3479 | 222 | cur_time = get_jiffies_64(); |
e35d35a1 | 223 | |
d0563a03 TJ |
224 | /* Immediately exit if previous_freq is not initialized yet. */ |
225 | if (!devfreq->previous_freq) | |
226 | goto out; | |
227 | ||
e35d35a1 SK |
228 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
229 | if (prev_lev < 0) { | |
230 | ret = prev_lev; | |
231 | goto out; | |
232 | } | |
233 | ||
1ebd0bc0 KK |
234 | devfreq->stats.time_in_state[prev_lev] += |
235 | cur_time - devfreq->stats.last_update; | |
e35d35a1 SK |
236 | |
237 | lev = devfreq_get_freq_level(devfreq, freq); | |
238 | if (lev < 0) { | |
239 | ret = lev; | |
240 | goto out; | |
241 | } | |
242 | ||
243 | if (lev != prev_lev) { | |
1ebd0bc0 | 244 | devfreq->stats.trans_table[ |
b5d281f6 | 245 | (prev_lev * devfreq->max_state) + lev]++; |
1ebd0bc0 | 246 | devfreq->stats.total_trans++; |
e552bbaf | 247 | } |
e552bbaf | 248 | |
e35d35a1 | 249 | out: |
1ebd0bc0 | 250 | devfreq->stats.last_update = cur_time; |
e35d35a1 | 251 | return ret; |
e552bbaf | 252 | } |
30582c25 | 253 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 254 | |
3aa173b8 NM |
255 | /** |
256 | * find_devfreq_governor() - find devfreq governor from name | |
257 | * @name: name of the governor | |
258 | * | |
259 | * Search the list of devfreq governors and return the matched | |
260 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
261 | */ | |
262 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
263 | { | |
264 | struct devfreq_governor *tmp_governor; | |
265 | ||
8fc0e48e KK |
266 | lockdep_assert_held(&devfreq_list_lock); |
267 | ||
9348da2f | 268 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
269 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
270 | return ERR_PTR(-EINVAL); | |
271 | } | |
3aa173b8 NM |
272 | |
273 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
274 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
275 | return tmp_governor; | |
276 | } | |
277 | ||
278 | return ERR_PTR(-ENODEV); | |
279 | } | |
280 | ||
23c7b54c EBS |
281 | /** |
282 | * try_then_request_governor() - Try to find the governor and request the | |
283 | * module if is not found. | |
284 | * @name: name of the governor | |
285 | * | |
286 | * Search the list of devfreq governors and request the module and try again | |
287 | * if is not found. This can happen when both drivers (the governor driver | |
288 | * and the driver that call devfreq_add_device) are built as modules. | |
289 | * devfreq_list_lock should be held by the caller. Returns the matched | |
b53b0128 | 290 | * governor's pointer or an error pointer. |
23c7b54c EBS |
291 | */ |
292 | static struct devfreq_governor *try_then_request_governor(const char *name) | |
293 | { | |
294 | struct devfreq_governor *governor; | |
295 | int err = 0; | |
296 | ||
8fc0e48e KK |
297 | lockdep_assert_held(&devfreq_list_lock); |
298 | ||
23c7b54c EBS |
299 | if (IS_ERR_OR_NULL(name)) { |
300 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); | |
301 | return ERR_PTR(-EINVAL); | |
302 | } | |
23c7b54c EBS |
303 | |
304 | governor = find_devfreq_governor(name); | |
305 | if (IS_ERR(governor)) { | |
306 | mutex_unlock(&devfreq_list_lock); | |
307 | ||
308 | if (!strncmp(name, DEVFREQ_GOV_SIMPLE_ONDEMAND, | |
309 | DEVFREQ_NAME_LEN)) | |
310 | err = request_module("governor_%s", "simpleondemand"); | |
311 | else | |
312 | err = request_module("governor_%s", name); | |
313 | /* Restore previous state before return */ | |
314 | mutex_lock(&devfreq_list_lock); | |
315 | if (err) | |
7544fd7f | 316 | return (err < 0) ? ERR_PTR(err) : ERR_PTR(-EINVAL); |
23c7b54c EBS |
317 | |
318 | governor = find_devfreq_governor(name); | |
319 | } | |
320 | ||
321 | return governor; | |
322 | } | |
323 | ||
0fe3a664 CC |
324 | static int devfreq_notify_transition(struct devfreq *devfreq, |
325 | struct devfreq_freqs *freqs, unsigned int state) | |
326 | { | |
327 | if (!devfreq) | |
328 | return -EINVAL; | |
329 | ||
330 | switch (state) { | |
331 | case DEVFREQ_PRECHANGE: | |
332 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
333 | DEVFREQ_PRECHANGE, freqs); | |
334 | break; | |
335 | ||
336 | case DEVFREQ_POSTCHANGE: | |
337 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
338 | DEVFREQ_POSTCHANGE, freqs); | |
339 | break; | |
340 | default: | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
63314172 LL |
347 | static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, |
348 | u32 flags) | |
349 | { | |
350 | struct devfreq_freqs freqs; | |
351 | unsigned long cur_freq; | |
352 | int err = 0; | |
353 | ||
354 | if (devfreq->profile->get_cur_freq) | |
355 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
356 | else | |
357 | cur_freq = devfreq->previous_freq; | |
358 | ||
359 | freqs.old = cur_freq; | |
360 | freqs.new = new_freq; | |
361 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
362 | ||
363 | err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); | |
364 | if (err) { | |
365 | freqs.new = cur_freq; | |
366 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
367 | return err; | |
368 | } | |
369 | ||
cab477d0 MK |
370 | /* |
371 | * Print devfreq_frequency trace information between DEVFREQ_PRECHANGE | |
372 | * and DEVFREQ_POSTCHANGE because for showing the correct frequency | |
373 | * change order of between devfreq device and passive devfreq device. | |
374 | */ | |
375 | if (trace_devfreq_frequency_enabled() && new_freq != cur_freq) | |
376 | trace_devfreq_frequency(devfreq, new_freq, cur_freq); | |
377 | ||
63314172 LL |
378 | freqs.new = new_freq; |
379 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
380 | ||
381 | if (devfreq_update_status(devfreq, new_freq)) | |
46674314 TBS |
382 | dev_warn(&devfreq->dev, |
383 | "Couldn't update frequency transition information.\n"); | |
63314172 LL |
384 | |
385 | devfreq->previous_freq = new_freq; | |
83f8ca45 LL |
386 | |
387 | if (devfreq->suspend_freq) | |
62453f1b | 388 | devfreq->resume_freq = new_freq; |
83f8ca45 | 389 | |
63314172 LL |
390 | return err; |
391 | } | |
392 | ||
a3c98b8b | 393 | /** |
b4365423 CC |
394 | * devfreq_update_target() - Reevaluate the device and configure frequency |
395 | * on the final stage. | |
a3c98b8b | 396 | * @devfreq: the devfreq instance. |
b4365423 CC |
397 | * @freq: the new frequency of parent device. This argument |
398 | * is only used for devfreq device using passive governor. | |
a3c98b8b | 399 | * |
b4365423 CC |
400 | * Note: Lock devfreq->lock before calling devfreq_update_target. This function |
401 | * should be only used by both update_devfreq() and devfreq governors. | |
a3c98b8b | 402 | */ |
b4365423 | 403 | int devfreq_update_target(struct devfreq *devfreq, unsigned long freq) |
a3c98b8b | 404 | { |
b4365423 | 405 | unsigned long min_freq, max_freq; |
a3c98b8b | 406 | int err = 0; |
ab5f299f | 407 | u32 flags = 0; |
a3c98b8b | 408 | |
8fc0e48e | 409 | lockdep_assert_held(&devfreq->lock); |
a3c98b8b | 410 | |
1b5c1be2 NM |
411 | if (!devfreq->governor) |
412 | return -EINVAL; | |
413 | ||
a3c98b8b MH |
414 | /* Reevaluate the proper frequency */ |
415 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
416 | if (err) | |
417 | return err; | |
713472e5 | 418 | devfreq_get_freq_range(devfreq, &min_freq, &max_freq); |
ab5f299f | 419 | |
df5cf4a3 | 420 | if (freq < min_freq) { |
f1d981ea | 421 | freq = min_freq; |
ab5f299f MH |
422 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ |
423 | } | |
df5cf4a3 | 424 | if (freq > max_freq) { |
f1d981ea | 425 | freq = max_freq; |
ab5f299f MH |
426 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ |
427 | } | |
428 | ||
63314172 | 429 | return devfreq_set_target(devfreq, freq, flags); |
b4365423 CC |
430 | } |
431 | EXPORT_SYMBOL(devfreq_update_target); | |
432 | ||
433 | /* Load monitoring helper functions for governors use */ | |
0fe3a664 | 434 | |
b4365423 CC |
435 | /** |
436 | * update_devfreq() - Reevaluate the device and configure frequency. | |
437 | * @devfreq: the devfreq instance. | |
438 | * | |
439 | * Note: Lock devfreq->lock before calling update_devfreq | |
440 | * This function is exported for governors. | |
441 | */ | |
442 | int update_devfreq(struct devfreq *devfreq) | |
443 | { | |
444 | return devfreq_update_target(devfreq, 0L); | |
a3c98b8b | 445 | } |
2df5021f | 446 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 447 | |
7e6fdd4b RV |
448 | /** |
449 | * devfreq_monitor() - Periodically poll devfreq objects. | |
450 | * @work: the work struct used to run devfreq_monitor periodically. | |
451 | * | |
452 | */ | |
453 | static void devfreq_monitor(struct work_struct *work) | |
454 | { | |
455 | int err; | |
456 | struct devfreq *devfreq = container_of(work, | |
457 | struct devfreq, work.work); | |
458 | ||
459 | mutex_lock(&devfreq->lock); | |
460 | err = update_devfreq(devfreq); | |
461 | if (err) | |
462 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
463 | ||
464 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
465 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
466 | mutex_unlock(&devfreq->lock); | |
cf451adf LL |
467 | |
468 | trace_devfreq_monitor(devfreq); | |
7e6fdd4b RV |
469 | } |
470 | ||
471 | /** | |
472 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
473 | * @devfreq: the devfreq instance. | |
474 | * | |
2c090832 | 475 | * Helper function for starting devfreq device load monitoring. By |
7e6fdd4b RV |
476 | * default delayed work based monitoring is supported. Function |
477 | * to be called from governor in response to DEVFREQ_GOV_START | |
478 | * event when device is added to devfreq framework. | |
479 | */ | |
480 | void devfreq_monitor_start(struct devfreq *devfreq) | |
481 | { | |
0dd25a0d | 482 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
483 | return; |
484 | ||
4dc3bab8 CC |
485 | switch (devfreq->profile->timer) { |
486 | case DEVFREQ_TIMER_DEFERRABLE: | |
487 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
488 | break; | |
489 | case DEVFREQ_TIMER_DELAYED: | |
490 | INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); | |
491 | break; | |
492 | default: | |
493 | return; | |
494 | } | |
495 | ||
7e6fdd4b RV |
496 | if (devfreq->profile->polling_ms) |
497 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
498 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
499 | } | |
6dcdd8e3 | 500 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
501 | |
502 | /** | |
503 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
504 | * @devfreq: the devfreq instance. | |
505 | * | |
2c090832 | 506 | * Helper function to stop devfreq device load monitoring. Function |
7e6fdd4b RV |
507 | * to be called from governor in response to DEVFREQ_GOV_STOP |
508 | * event when device is removed from devfreq framework. | |
509 | */ | |
510 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
511 | { | |
0dd25a0d | 512 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
513 | return; |
514 | ||
7e6fdd4b RV |
515 | cancel_delayed_work_sync(&devfreq->work); |
516 | } | |
6dcdd8e3 | 517 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
518 | |
519 | /** | |
520 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
521 | * @devfreq: the devfreq instance. | |
522 | * | |
2c090832 | 523 | * Helper function to suspend devfreq device load monitoring. Function |
7e6fdd4b RV |
524 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND |
525 | * event or when polling interval is set to zero. | |
526 | * | |
527 | * Note: Though this function is same as devfreq_monitor_stop(), | |
528 | * intentionally kept separate to provide hooks for collecting | |
529 | * transition statistics. | |
530 | */ | |
531 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
532 | { | |
533 | mutex_lock(&devfreq->lock); | |
534 | if (devfreq->stop_polling) { | |
535 | mutex_unlock(&devfreq->lock); | |
536 | return; | |
537 | } | |
538 | ||
39688ce6 | 539 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
540 | devfreq->stop_polling = true; |
541 | mutex_unlock(&devfreq->lock); | |
5c0f6c79 | 542 | |
0dd25a0d | 543 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
544 | return; |
545 | ||
7e6fdd4b RV |
546 | cancel_delayed_work_sync(&devfreq->work); |
547 | } | |
6dcdd8e3 | 548 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
549 | |
550 | /** | |
551 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
552 | * @devfreq: the devfreq instance. | |
553 | * | |
2c090832 | 554 | * Helper function to resume devfreq device load monitoring. Function |
7e6fdd4b RV |
555 | * to be called from governor in response to DEVFREQ_GOV_RESUME |
556 | * event or when polling interval is set to non-zero. | |
557 | */ | |
558 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
559 | { | |
39688ce6 RV |
560 | unsigned long freq; |
561 | ||
7e6fdd4b | 562 | mutex_lock(&devfreq->lock); |
7e6fdd4b | 563 | |
0dd25a0d | 564 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
5c0f6c79 DO |
565 | goto out_update; |
566 | ||
0dd25a0d CC |
567 | if (!devfreq->stop_polling) |
568 | goto out; | |
569 | ||
7e6fdd4b RV |
570 | if (!delayed_work_pending(&devfreq->work) && |
571 | devfreq->profile->polling_ms) | |
572 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
573 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 | 574 | |
5c0f6c79 | 575 | out_update: |
1ebd0bc0 | 576 | devfreq->stats.last_update = get_jiffies_64(); |
7e6fdd4b RV |
577 | devfreq->stop_polling = false; |
578 | ||
39688ce6 RV |
579 | if (devfreq->profile->get_cur_freq && |
580 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
581 | devfreq->previous_freq = freq; | |
582 | ||
7e6fdd4b RV |
583 | out: |
584 | mutex_unlock(&devfreq->lock); | |
585 | } | |
6dcdd8e3 | 586 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
587 | |
588 | /** | |
3a1ec2e8 | 589 | * devfreq_update_interval() - Update device devfreq monitoring interval |
7e6fdd4b RV |
590 | * @devfreq: the devfreq instance. |
591 | * @delay: new polling interval to be set. | |
592 | * | |
593 | * Helper function to set new load monitoring polling interval. Function | |
3a1ec2e8 | 594 | * to be called from governor in response to DEVFREQ_GOV_UPDATE_INTERVAL event. |
7e6fdd4b | 595 | */ |
3a1ec2e8 | 596 | void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) |
7e6fdd4b RV |
597 | { |
598 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
599 | unsigned int new_delay = *delay; | |
600 | ||
601 | mutex_lock(&devfreq->lock); | |
602 | devfreq->profile->polling_ms = new_delay; | |
603 | ||
0dd25a0d | 604 | if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
7e6fdd4b RV |
605 | goto out; |
606 | ||
0dd25a0d | 607 | if (devfreq->stop_polling) |
5c0f6c79 DO |
608 | goto out; |
609 | ||
7e6fdd4b RV |
610 | /* if new delay is zero, stop polling */ |
611 | if (!new_delay) { | |
612 | mutex_unlock(&devfreq->lock); | |
613 | cancel_delayed_work_sync(&devfreq->work); | |
614 | return; | |
615 | } | |
616 | ||
617 | /* if current delay is zero, start polling with new delay */ | |
618 | if (!cur_delay) { | |
619 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
620 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
621 | goto out; | |
622 | } | |
623 | ||
624 | /* if current delay is greater than new delay, restart polling */ | |
625 | if (cur_delay > new_delay) { | |
626 | mutex_unlock(&devfreq->lock); | |
627 | cancel_delayed_work_sync(&devfreq->work); | |
628 | mutex_lock(&devfreq->lock); | |
629 | if (!devfreq->stop_polling) | |
630 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
6d690f77 | 631 | msecs_to_jiffies(devfreq->profile->polling_ms)); |
7e6fdd4b RV |
632 | } |
633 | out: | |
634 | mutex_unlock(&devfreq->lock); | |
635 | } | |
3a1ec2e8 | 636 | EXPORT_SYMBOL(devfreq_update_interval); |
a3c98b8b MH |
637 | |
638 | /** | |
639 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
6d690f77 | 640 | * has been changed out of devfreq framework. |
c5b4a1c1 NM |
641 | * @nb: the notifier_block (supposed to be devfreq->nb) |
642 | * @type: not used | |
643 | * @devp: not used | |
a3c98b8b MH |
644 | * |
645 | * Called by a notifier that uses devfreq->nb. | |
646 | */ | |
647 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
648 | void *devp) | |
649 | { | |
650 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
e876e710 | 651 | int err = -EINVAL; |
a3c98b8b MH |
652 | |
653 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
654 | |
655 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
e876e710 LC |
656 | if (!devfreq->scaling_min_freq) |
657 | goto out; | |
f1d981ea CC |
658 | |
659 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
e7cc792d LC |
660 | if (!devfreq->scaling_max_freq) { |
661 | devfreq->scaling_max_freq = ULONG_MAX; | |
e876e710 | 662 | goto out; |
e7cc792d | 663 | } |
e876e710 LC |
664 | |
665 | err = update_devfreq(devfreq); | |
f1d981ea | 666 | |
e876e710 | 667 | out: |
a3c98b8b | 668 | mutex_unlock(&devfreq->lock); |
e876e710 LC |
669 | if (err) |
670 | dev_err(devfreq->dev.parent, | |
671 | "failed to update frequency from OPP notifier (%d)\n", | |
672 | err); | |
a3c98b8b | 673 | |
e876e710 | 674 | return NOTIFY_OK; |
a3c98b8b MH |
675 | } |
676 | ||
05d7ae15 LC |
677 | /** |
678 | * qos_notifier_call() - Common handler for QoS constraints. | |
679 | * @devfreq: the devfreq instance. | |
680 | */ | |
681 | static int qos_notifier_call(struct devfreq *devfreq) | |
682 | { | |
683 | int err; | |
684 | ||
685 | mutex_lock(&devfreq->lock); | |
686 | err = update_devfreq(devfreq); | |
687 | mutex_unlock(&devfreq->lock); | |
688 | if (err) | |
689 | dev_err(devfreq->dev.parent, | |
690 | "failed to update frequency from PM QoS (%d)\n", | |
691 | err); | |
692 | ||
693 | return NOTIFY_OK; | |
694 | } | |
695 | ||
696 | /** | |
697 | * qos_min_notifier_call() - Callback for QoS min_freq changes. | |
698 | * @nb: Should be devfreq->nb_min | |
c9deb748 MCC |
699 | * @val: not used |
700 | * @ptr: not used | |
05d7ae15 LC |
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 | |
c9deb748 MCC |
711 | * @val: not used |
712 | * @ptr: not used | |
05d7ae15 LC |
713 | */ |
714 | static int qos_max_notifier_call(struct notifier_block *nb, | |
715 | unsigned long val, void *ptr) | |
716 | { | |
717 | return qos_notifier_call(container_of(nb, struct devfreq, nb_max)); | |
718 | } | |
719 | ||
a3c98b8b | 720 | /** |
29b6968b CC |
721 | * devfreq_dev_release() - Callback for struct device to release the device. |
722 | * @dev: the devfreq device | |
723 | * | |
724 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 725 | */ |
29b6968b | 726 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 727 | { |
29b6968b | 728 | struct devfreq *devfreq = to_devfreq(dev); |
05d7ae15 | 729 | int err; |
29b6968b | 730 | |
7e6fdd4b | 731 | mutex_lock(&devfreq_list_lock); |
7e6fdd4b RV |
732 | list_del(&devfreq->node); |
733 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 734 | |
05d7ae15 LC |
735 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max, |
736 | DEV_PM_QOS_MAX_FREQUENCY); | |
737 | if (err && err != -ENOENT) | |
738 | dev_warn(dev->parent, | |
739 | "Failed to remove max_freq notifier: %d\n", err); | |
740 | err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min, | |
741 | DEV_PM_QOS_MIN_FREQUENCY); | |
742 | if (err && err != -ENOENT) | |
743 | dev_warn(dev->parent, | |
744 | "Failed to remove min_freq notifier: %d\n", err); | |
745 | ||
27dbc542 LC |
746 | if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) { |
747 | err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); | |
4c6abef7 | 748 | if (err < 0) |
27dbc542 LC |
749 | dev_warn(dev->parent, |
750 | "Failed to remove max_freq request: %d\n", err); | |
751 | } | |
752 | if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) { | |
753 | err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); | |
4c6abef7 | 754 | if (err < 0) |
27dbc542 LC |
755 | dev_warn(dev->parent, |
756 | "Failed to remove min_freq request: %d\n", err); | |
757 | } | |
758 | ||
a3c98b8b MH |
759 | if (devfreq->profile->exit) |
760 | devfreq->profile->exit(devfreq->dev.parent); | |
761 | ||
26f9c7cc SK |
762 | if (devfreq->opp_table) |
763 | dev_pm_opp_put_opp_table(devfreq->opp_table); | |
764 | ||
a3c98b8b | 765 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
766 | kfree(devfreq); |
767 | } | |
768 | ||
5f1a9066 CC |
769 | static void create_sysfs_files(struct devfreq *devfreq, |
770 | const struct devfreq_governor *gov); | |
771 | static void remove_sysfs_files(struct devfreq *devfreq, | |
772 | const struct devfreq_governor *gov); | |
773 | ||
a3c98b8b MH |
774 | /** |
775 | * devfreq_add_device() - Add devfreq feature to the device | |
776 | * @dev: the device to add devfreq feature. | |
777 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 778 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
779 | * @data: private data for the governor. The devfreq framework does not |
780 | * touch this value. | |
781 | */ | |
782 | struct devfreq *devfreq_add_device(struct device *dev, | |
783 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 784 | const char *governor_name, |
a3c98b8b MH |
785 | void *data) |
786 | { | |
787 | struct devfreq *devfreq; | |
1b5c1be2 | 788 | struct devfreq_governor *governor; |
713472e5 | 789 | unsigned long min_freq, max_freq; |
a3c98b8b MH |
790 | int err = 0; |
791 | ||
1b5c1be2 | 792 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
793 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
794 | return ERR_PTR(-EINVAL); | |
795 | } | |
796 | ||
7e6fdd4b RV |
797 | mutex_lock(&devfreq_list_lock); |
798 | devfreq = find_device_devfreq(dev); | |
799 | mutex_unlock(&devfreq_list_lock); | |
800 | if (!IS_ERR(devfreq)) { | |
df4d7b14 | 801 | dev_err(dev, "%s: devfreq device already exists!\n", |
9d0109be | 802 | __func__); |
7e6fdd4b RV |
803 | err = -EINVAL; |
804 | goto err_out; | |
a3c98b8b MH |
805 | } |
806 | ||
807 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
808 | if (!devfreq) { | |
a3c98b8b | 809 | err = -ENOMEM; |
3f19f08a | 810 | goto err_out; |
a3c98b8b MH |
811 | } |
812 | ||
813 | mutex_init(&devfreq->lock); | |
814 | mutex_lock(&devfreq->lock); | |
815 | devfreq->dev.parent = dev; | |
816 | devfreq->dev.class = devfreq_class; | |
817 | devfreq->dev.release = devfreq_dev_release; | |
42a6b25e | 818 | INIT_LIST_HEAD(&devfreq->node); |
a3c98b8b | 819 | devfreq->profile = profile; |
a3c98b8b | 820 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 821 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 822 | devfreq->data = data; |
a3c98b8b MH |
823 | devfreq->nb.notifier_call = devfreq_notifier_call; |
824 | ||
4dc3bab8 CC |
825 | if (devfreq->profile->timer < 0 |
826 | || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { | |
8b50a799 | 827 | mutex_unlock(&devfreq->lock); |
18b380ed | 828 | err = -EINVAL; |
8b50a799 | 829 | goto err_dev; |
4dc3bab8 CC |
830 | } |
831 | ||
5cf79c29 | 832 | if (!devfreq->profile->max_state || !devfreq->profile->freq_table) { |
0ec09ac2 | 833 | mutex_unlock(&devfreq->lock); |
ea572f81 CC |
834 | err = set_freq_table(devfreq); |
835 | if (err < 0) | |
a9487917 | 836 | goto err_dev; |
0ec09ac2 | 837 | mutex_lock(&devfreq->lock); |
b5d281f6 CM |
838 | } else { |
839 | devfreq->freq_table = devfreq->profile->freq_table; | |
840 | devfreq->max_state = devfreq->profile->max_state; | |
0ec09ac2 CC |
841 | } |
842 | ||
2c2cb1e6 MK |
843 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); |
844 | if (!devfreq->scaling_min_freq) { | |
ab8f58ad CC |
845 | mutex_unlock(&devfreq->lock); |
846 | err = -EINVAL; | |
847 | goto err_dev; | |
848 | } | |
849 | ||
2c2cb1e6 MK |
850 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); |
851 | if (!devfreq->scaling_max_freq) { | |
ab8f58ad CC |
852 | mutex_unlock(&devfreq->lock); |
853 | err = -EINVAL; | |
854 | goto err_dev; | |
855 | } | |
856 | ||
713472e5 CC |
857 | devfreq_get_freq_range(devfreq, &min_freq, &max_freq); |
858 | ||
83f8ca45 | 859 | devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); |
26f9c7cc SK |
860 | devfreq->opp_table = dev_pm_opp_get_opp_table(dev); |
861 | if (IS_ERR(devfreq->opp_table)) | |
862 | devfreq->opp_table = NULL; | |
863 | ||
83f8ca45 LL |
864 | atomic_set(&devfreq->suspend_count, 0); |
865 | ||
66d0e797 | 866 | dev_set_name(&devfreq->dev, "%s", dev_name(dev)); |
a3c98b8b MH |
867 | err = device_register(&devfreq->dev); |
868 | if (err) { | |
7e6fdd4b | 869 | mutex_unlock(&devfreq->lock); |
2d803dc8 AY |
870 | put_device(&devfreq->dev); |
871 | goto err_out; | |
a3c98b8b MH |
872 | } |
873 | ||
1ebd0bc0 | 874 | devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, |
6d690f77 | 875 | array3_size(sizeof(unsigned int), |
b5d281f6 CM |
876 | devfreq->max_state, |
877 | devfreq->max_state), | |
6d690f77 | 878 | GFP_KERNEL); |
1ebd0bc0 | 879 | if (!devfreq->stats.trans_table) { |
25846fa1 YL |
880 | mutex_unlock(&devfreq->lock); |
881 | err = -ENOMEM; | |
882 | goto err_devfreq; | |
883 | } | |
884 | ||
1ebd0bc0 | 885 | devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, |
b5d281f6 | 886 | devfreq->max_state, |
1ebd0bc0 | 887 | sizeof(*devfreq->stats.time_in_state), |
6d690f77 | 888 | GFP_KERNEL); |
1ebd0bc0 | 889 | if (!devfreq->stats.time_in_state) { |
25846fa1 YL |
890 | mutex_unlock(&devfreq->lock); |
891 | err = -ENOMEM; | |
892 | goto err_devfreq; | |
893 | } | |
894 | ||
1ebd0bc0 KK |
895 | devfreq->stats.total_trans = 0; |
896 | devfreq->stats.last_update = get_jiffies_64(); | |
3e1d7fb0 | 897 | |
0fe3a664 CC |
898 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
899 | ||
a3c98b8b MH |
900 | mutex_unlock(&devfreq->lock); |
901 | ||
27dbc542 LC |
902 | err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, |
903 | DEV_PM_QOS_MIN_FREQUENCY, 0); | |
904 | if (err < 0) | |
905 | goto err_devfreq; | |
906 | err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, | |
907 | DEV_PM_QOS_MAX_FREQUENCY, | |
908 | PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); | |
909 | if (err < 0) | |
910 | goto err_devfreq; | |
911 | ||
05d7ae15 | 912 | devfreq->nb_min.notifier_call = qos_min_notifier_call; |
ec894883 | 913 | err = dev_pm_qos_add_notifier(dev, &devfreq->nb_min, |
05d7ae15 LC |
914 | DEV_PM_QOS_MIN_FREQUENCY); |
915 | if (err) | |
916 | goto err_devfreq; | |
917 | ||
918 | devfreq->nb_max.notifier_call = qos_max_notifier_call; | |
ec894883 | 919 | err = dev_pm_qos_add_notifier(dev, &devfreq->nb_max, |
05d7ae15 LC |
920 | DEV_PM_QOS_MAX_FREQUENCY); |
921 | if (err) | |
922 | goto err_devfreq; | |
923 | ||
a3c98b8b | 924 | mutex_lock(&devfreq_list_lock); |
a3c98b8b | 925 | |
96ffcdf2 | 926 | governor = try_then_request_governor(governor_name); |
73613b16 CC |
927 | if (IS_ERR(governor)) { |
928 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
929 | __func__); | |
930 | err = PTR_ERR(governor); | |
931 | goto err_init; | |
932 | } | |
933 | ||
934 | devfreq->governor = governor; | |
935 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
936 | NULL); | |
7e6fdd4b | 937 | if (err) { |
e52b045f CAM |
938 | dev_err_probe(dev, err, |
939 | "%s: Unable to start governor for the device\n", | |
940 | __func__); | |
7e6fdd4b | 941 | goto err_init; |
a3c98b8b | 942 | } |
5f1a9066 | 943 | create_sysfs_files(devfreq, devfreq->governor); |
23c7b54c EBS |
944 | |
945 | list_add(&devfreq->node, &devfreq_list); | |
946 | ||
0f376c9c | 947 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 948 | |
1224451b DL |
949 | if (devfreq->profile->is_cooling_device) { |
950 | devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); | |
951 | if (IS_ERR(devfreq->cdev)) | |
952 | devfreq->cdev = NULL; | |
953 | } | |
954 | ||
3f19f08a AL |
955 | return devfreq; |
956 | ||
a3c98b8b | 957 | err_init: |
0f376c9c | 958 | mutex_unlock(&devfreq_list_lock); |
25846fa1 | 959 | err_devfreq: |
2f061fd0 | 960 | devfreq_remove_device(devfreq); |
2d803dc8 | 961 | devfreq = NULL; |
9e14de10 | 962 | err_dev: |
8188b154 | 963 | kfree(devfreq); |
3f19f08a AL |
964 | err_out: |
965 | return ERR_PTR(err); | |
a3c98b8b | 966 | } |
7e6fdd4b | 967 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
968 | |
969 | /** | |
970 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 971 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
972 | * |
973 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
974 | */ |
975 | int devfreq_remove_device(struct devfreq *devfreq) | |
976 | { | |
977 | if (!devfreq) | |
978 | return -EINVAL; | |
979 | ||
1224451b DL |
980 | devfreq_cooling_unregister(devfreq->cdev); |
981 | ||
5f1a9066 | 982 | if (devfreq->governor) { |
2f061fd0 VD |
983 | devfreq->governor->event_handler(devfreq, |
984 | DEVFREQ_GOV_STOP, NULL); | |
5f1a9066 CC |
985 | remove_sysfs_files(devfreq, devfreq->governor); |
986 | } | |
987 | ||
585fc83e | 988 | device_unregister(&devfreq->dev); |
9f3bdd4f | 989 | |
a3c98b8b MH |
990 | return 0; |
991 | } | |
7e6fdd4b | 992 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 993 | |
8cd84092 CC |
994 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
995 | { | |
996 | struct devfreq **r = res; | |
997 | ||
998 | if (WARN_ON(!r || !*r)) | |
999 | return 0; | |
1000 | ||
1001 | return *r == data; | |
1002 | } | |
1003 | ||
1004 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
1005 | { | |
1006 | devfreq_remove_device(*(struct devfreq **)res); | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
1011 | * @dev: the device to add devfreq feature. | |
1012 | * @profile: device-specific profile to run devfreq. | |
1013 | * @governor_name: name of the policy to choose frequency. | |
1014 | * @data: private data for the governor. The devfreq framework does not | |
1015 | * touch this value. | |
1016 | * | |
1017 | * This function manages automatically the memory of devfreq device using device | |
1018 | * resource management and simplify the free operation for memory of devfreq | |
1019 | * device. | |
1020 | */ | |
1021 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
1022 | struct devfreq_dev_profile *profile, | |
1023 | const char *governor_name, | |
1024 | void *data) | |
1025 | { | |
1026 | struct devfreq **ptr, *devfreq; | |
1027 | ||
1028 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
1029 | if (!ptr) | |
1030 | return ERR_PTR(-ENOMEM); | |
1031 | ||
1032 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
1033 | if (IS_ERR(devfreq)) { | |
1034 | devres_free(ptr); | |
d1bf2d30 | 1035 | return devfreq; |
8cd84092 CC |
1036 | } |
1037 | ||
1038 | *ptr = devfreq; | |
1039 | devres_add(dev, ptr); | |
1040 | ||
1041 | return devfreq; | |
1042 | } | |
1043 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
1044 | ||
8f510aeb | 1045 | #ifdef CONFIG_OF |
7b38b7b0 LC |
1046 | /* |
1047 | * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree | |
1048 | * @node - pointer to device_node | |
1049 | * | |
1050 | * return the instance of devfreq device | |
1051 | */ | |
1052 | struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) | |
1053 | { | |
1054 | struct devfreq *devfreq; | |
1055 | ||
1056 | if (!node) | |
1057 | return ERR_PTR(-EINVAL); | |
1058 | ||
1059 | mutex_lock(&devfreq_list_lock); | |
1060 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1061 | if (devfreq->dev.parent | |
1062 | && devfreq->dev.parent->of_node == node) { | |
1063 | mutex_unlock(&devfreq_list_lock); | |
1064 | return devfreq; | |
1065 | } | |
1066 | } | |
1067 | mutex_unlock(&devfreq_list_lock); | |
1068 | ||
1069 | return ERR_PTR(-ENODEV); | |
1070 | } | |
1071 | ||
8f510aeb CC |
1072 | /* |
1073 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
1074 | * @dev - instance to the given device | |
86d90fd9 | 1075 | * @phandle_name - name of property holding a phandle value |
8f510aeb CC |
1076 | * @index - index into list of devfreq |
1077 | * | |
1078 | * return the instance of devfreq device | |
1079 | */ | |
86d90fd9 CC |
1080 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, |
1081 | const char *phandle_name, int index) | |
8f510aeb CC |
1082 | { |
1083 | struct device_node *node; | |
1084 | struct devfreq *devfreq; | |
1085 | ||
86d90fd9 | 1086 | if (!dev || !phandle_name) |
8f510aeb CC |
1087 | return ERR_PTR(-EINVAL); |
1088 | ||
1089 | if (!dev->of_node) | |
1090 | return ERR_PTR(-EINVAL); | |
1091 | ||
86d90fd9 | 1092 | node = of_parse_phandle(dev->of_node, phandle_name, index); |
8f510aeb CC |
1093 | if (!node) |
1094 | return ERR_PTR(-ENODEV); | |
1095 | ||
7b38b7b0 | 1096 | devfreq = devfreq_get_devfreq_by_node(node); |
3427c6f0 | 1097 | of_node_put(node); |
8f510aeb | 1098 | |
7b38b7b0 | 1099 | return devfreq; |
8f510aeb | 1100 | } |
7b38b7b0 | 1101 | |
8f510aeb | 1102 | #else |
7b38b7b0 LC |
1103 | struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) |
1104 | { | |
1105 | return ERR_PTR(-ENODEV); | |
1106 | } | |
1107 | ||
86d90fd9 CC |
1108 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, |
1109 | const char *phandle_name, int index) | |
8f510aeb CC |
1110 | { |
1111 | return ERR_PTR(-ENODEV); | |
1112 | } | |
1113 | #endif /* CONFIG_OF */ | |
7b38b7b0 | 1114 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node); |
8f510aeb CC |
1115 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); |
1116 | ||
8cd84092 CC |
1117 | /** |
1118 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
e2fc1677 | 1119 | * @dev: the device from which to remove devfreq feature. |
8cd84092 CC |
1120 | * @devfreq: the devfreq instance to be removed |
1121 | */ | |
1122 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
1123 | { | |
1124 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
1125 | devm_devfreq_dev_match, devfreq)); | |
1126 | } | |
1127 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
1128 | ||
206c30cf RV |
1129 | /** |
1130 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
1131 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
1132 | * |
1133 | * This function is intended to be called by the pm callbacks | |
1134 | * (e.g., runtime_suspend, suspend) of the device driver that | |
1135 | * holds the devfreq. | |
206c30cf RV |
1136 | */ |
1137 | int devfreq_suspend_device(struct devfreq *devfreq) | |
1138 | { | |
83f8ca45 LL |
1139 | int ret; |
1140 | ||
a3c98b8b MH |
1141 | if (!devfreq) |
1142 | return -EINVAL; | |
1143 | ||
83f8ca45 | 1144 | if (atomic_inc_return(&devfreq->suspend_count) > 1) |
1b5c1be2 NM |
1145 | return 0; |
1146 | ||
83f8ca45 LL |
1147 | if (devfreq->governor) { |
1148 | ret = devfreq->governor->event_handler(devfreq, | |
1149 | DEVFREQ_GOV_SUSPEND, NULL); | |
1150 | if (ret) | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | if (devfreq->suspend_freq) { | |
e1e047ac | 1155 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1156 | ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); |
e1e047ac | 1157 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1158 | if (ret) |
1159 | return ret; | |
1160 | } | |
1161 | ||
1162 | return 0; | |
206c30cf RV |
1163 | } |
1164 | EXPORT_SYMBOL(devfreq_suspend_device); | |
1165 | ||
1166 | /** | |
1167 | * devfreq_resume_device() - Resume devfreq of a device. | |
1168 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
1169 | * |
1170 | * This function is intended to be called by the pm callbacks | |
1171 | * (e.g., runtime_resume, resume) of the device driver that | |
1172 | * holds the devfreq. | |
206c30cf RV |
1173 | */ |
1174 | int devfreq_resume_device(struct devfreq *devfreq) | |
1175 | { | |
83f8ca45 LL |
1176 | int ret; |
1177 | ||
206c30cf RV |
1178 | if (!devfreq) |
1179 | return -EINVAL; | |
1180 | ||
83f8ca45 | 1181 | if (atomic_dec_return(&devfreq->suspend_count) >= 1) |
1b5c1be2 NM |
1182 | return 0; |
1183 | ||
83f8ca45 | 1184 | if (devfreq->resume_freq) { |
e1e047ac | 1185 | mutex_lock(&devfreq->lock); |
83f8ca45 | 1186 | ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); |
e1e047ac | 1187 | mutex_unlock(&devfreq->lock); |
83f8ca45 LL |
1188 | if (ret) |
1189 | return ret; | |
1190 | } | |
1191 | ||
1192 | if (devfreq->governor) { | |
1193 | ret = devfreq->governor->event_handler(devfreq, | |
1194 | DEVFREQ_GOV_RESUME, NULL); | |
1195 | if (ret) | |
1196 | return ret; | |
1197 | } | |
1198 | ||
1199 | return 0; | |
206c30cf RV |
1200 | } |
1201 | EXPORT_SYMBOL(devfreq_resume_device); | |
1202 | ||
59031956 LL |
1203 | /** |
1204 | * devfreq_suspend() - Suspend devfreq governors and devices | |
1205 | * | |
1206 | * Called during system wide Suspend/Hibernate cycles for suspending governors | |
1207 | * and devices preserving the state for resume. On some platforms the devfreq | |
1208 | * device must have precise state (frequency) after resume in order to provide | |
1209 | * fully operating setup. | |
1210 | */ | |
1211 | void devfreq_suspend(void) | |
1212 | { | |
1213 | struct devfreq *devfreq; | |
1214 | int ret; | |
1215 | ||
1216 | mutex_lock(&devfreq_list_lock); | |
1217 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1218 | ret = devfreq_suspend_device(devfreq); | |
1219 | if (ret) | |
1220 | dev_err(&devfreq->dev, | |
1221 | "failed to suspend devfreq device\n"); | |
1222 | } | |
1223 | mutex_unlock(&devfreq_list_lock); | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * devfreq_resume() - Resume devfreq governors and devices | |
1228 | * | |
1229 | * Called during system wide Suspend/Hibernate cycle for resuming governors and | |
1230 | * devices that are suspended with devfreq_suspend(). | |
1231 | */ | |
1232 | void devfreq_resume(void) | |
1233 | { | |
1234 | struct devfreq *devfreq; | |
1235 | int ret; | |
1236 | ||
1237 | mutex_lock(&devfreq_list_lock); | |
1238 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
1239 | ret = devfreq_resume_device(devfreq); | |
1240 | if (ret) | |
1241 | dev_warn(&devfreq->dev, | |
1242 | "failed to resume devfreq device\n"); | |
1243 | } | |
1244 | mutex_unlock(&devfreq_list_lock); | |
1245 | } | |
1246 | ||
3aa173b8 NM |
1247 | /** |
1248 | * devfreq_add_governor() - Add devfreq governor | |
1249 | * @governor: the devfreq governor to be added | |
1250 | */ | |
1251 | int devfreq_add_governor(struct devfreq_governor *governor) | |
1252 | { | |
1253 | struct devfreq_governor *g; | |
1b5c1be2 | 1254 | struct devfreq *devfreq; |
3aa173b8 NM |
1255 | int err = 0; |
1256 | ||
1257 | if (!governor) { | |
1258 | pr_err("%s: Invalid parameters.\n", __func__); | |
1259 | return -EINVAL; | |
1260 | } | |
1261 | ||
1262 | mutex_lock(&devfreq_list_lock); | |
1263 | g = find_devfreq_governor(governor->name); | |
1264 | if (!IS_ERR(g)) { | |
1265 | pr_err("%s: governor %s already registered\n", __func__, | |
1266 | g->name); | |
1267 | err = -EINVAL; | |
1268 | goto err_out; | |
1269 | } | |
9f3bdd4f | 1270 | |
3aa173b8 NM |
1271 | list_add(&governor->node, &devfreq_governor_list); |
1272 | ||
1b5c1be2 NM |
1273 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1274 | int ret = 0; | |
1275 | struct device *dev = devfreq->dev.parent; | |
1276 | ||
96ffcdf2 | 1277 | if (!strncmp(devfreq->governor->name, governor->name, |
1b5c1be2 NM |
1278 | DEVFREQ_NAME_LEN)) { |
1279 | /* The following should never occur */ | |
1280 | if (devfreq->governor) { | |
1281 | dev_warn(dev, | |
1282 | "%s: Governor %s already present\n", | |
1283 | __func__, devfreq->governor->name); | |
1284 | ret = devfreq->governor->event_handler(devfreq, | |
1285 | DEVFREQ_GOV_STOP, NULL); | |
1286 | if (ret) { | |
1287 | dev_warn(dev, | |
1288 | "%s: Governor %s stop = %d\n", | |
1289 | __func__, | |
1290 | devfreq->governor->name, ret); | |
1291 | } | |
1292 | /* Fall through */ | |
1293 | } | |
1294 | devfreq->governor = governor; | |
1295 | ret = devfreq->governor->event_handler(devfreq, | |
1296 | DEVFREQ_GOV_START, NULL); | |
1297 | if (ret) { | |
1298 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
1299 | __func__, devfreq->governor->name, | |
1300 | ret); | |
1301 | } | |
a3c98b8b MH |
1302 | } |
1303 | } | |
1304 | ||
3aa173b8 NM |
1305 | err_out: |
1306 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 1307 | |
3aa173b8 NM |
1308 | return err; |
1309 | } | |
1310 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 1311 | |
1cc55204 DO |
1312 | static void devm_devfreq_remove_governor(void *governor) |
1313 | { | |
1314 | WARN_ON(devfreq_remove_governor(governor)); | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * devm_devfreq_add_governor() - Add devfreq governor | |
1319 | * @dev: device which adds devfreq governor | |
1320 | * @governor: the devfreq governor to be added | |
1321 | * | |
1322 | * This is a resource-managed variant of devfreq_add_governor(). | |
1323 | */ | |
1324 | int devm_devfreq_add_governor(struct device *dev, | |
1325 | struct devfreq_governor *governor) | |
1326 | { | |
1327 | int err; | |
1328 | ||
1329 | err = devfreq_add_governor(governor); | |
1330 | if (err) | |
1331 | return err; | |
1332 | ||
1333 | return devm_add_action_or_reset(dev, devm_devfreq_remove_governor, | |
1334 | governor); | |
1335 | } | |
1336 | EXPORT_SYMBOL(devm_devfreq_add_governor); | |
1337 | ||
3aa173b8 | 1338 | /** |
bafeb42b | 1339 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
1340 | * @governor: the devfreq governor to be removed |
1341 | */ | |
1342 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
1343 | { | |
1344 | struct devfreq_governor *g; | |
1b5c1be2 | 1345 | struct devfreq *devfreq; |
3aa173b8 NM |
1346 | int err = 0; |
1347 | ||
1348 | if (!governor) { | |
1349 | pr_err("%s: Invalid parameters.\n", __func__); | |
1350 | return -EINVAL; | |
1351 | } | |
1352 | ||
1353 | mutex_lock(&devfreq_list_lock); | |
1354 | g = find_devfreq_governor(governor->name); | |
1355 | if (IS_ERR(g)) { | |
1356 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 1357 | governor->name); |
f9c08e2a | 1358 | err = PTR_ERR(g); |
3aa173b8 NM |
1359 | goto err_out; |
1360 | } | |
1b5c1be2 NM |
1361 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1362 | int ret; | |
1363 | struct device *dev = devfreq->dev.parent; | |
1364 | ||
96ffcdf2 | 1365 | if (!strncmp(devfreq->governor->name, governor->name, |
1b5c1be2 NM |
1366 | DEVFREQ_NAME_LEN)) { |
1367 | /* we should have a devfreq governor! */ | |
1368 | if (!devfreq->governor) { | |
1369 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
1370 | __func__, governor->name); | |
1371 | continue; | |
1372 | /* Fall through */ | |
1373 | } | |
1374 | ret = devfreq->governor->event_handler(devfreq, | |
1375 | DEVFREQ_GOV_STOP, NULL); | |
1376 | if (ret) { | |
1377 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
1378 | __func__, devfreq->governor->name, | |
1379 | ret); | |
1380 | } | |
1381 | devfreq->governor = NULL; | |
1382 | } | |
1383 | } | |
3aa173b8 NM |
1384 | |
1385 | list_del(&governor->node); | |
1386 | err_out: | |
1387 | mutex_unlock(&devfreq_list_lock); | |
1388 | ||
1389 | return err; | |
a3c98b8b | 1390 | } |
3aa173b8 | 1391 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 1392 | |
2fee1a7c CC |
1393 | static ssize_t name_show(struct device *dev, |
1394 | struct device_attribute *attr, char *buf) | |
1395 | { | |
483d557e CC |
1396 | struct devfreq *df = to_devfreq(dev); |
1397 | return sprintf(buf, "%s\n", dev_name(df->dev.parent)); | |
2fee1a7c CC |
1398 | } |
1399 | static DEVICE_ATTR_RO(name); | |
1400 | ||
a93d6b0a | 1401 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
1402 | struct device_attribute *attr, char *buf) |
1403 | { | |
483d557e CC |
1404 | struct devfreq *df = to_devfreq(dev); |
1405 | ||
1406 | if (!df->governor) | |
1b5c1be2 NM |
1407 | return -EINVAL; |
1408 | ||
483d557e | 1409 | return sprintf(buf, "%s\n", df->governor->name); |
9005b650 MH |
1410 | } |
1411 | ||
a93d6b0a | 1412 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
1413 | const char *buf, size_t count) |
1414 | { | |
1415 | struct devfreq *df = to_devfreq(dev); | |
1416 | int ret; | |
1417 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
bc658bef | 1418 | const struct devfreq_governor *governor, *prev_governor; |
0359d1af | 1419 | |
483d557e CC |
1420 | if (!df->governor) |
1421 | return -EINVAL; | |
1422 | ||
0359d1af NM |
1423 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); |
1424 | if (ret != 1) | |
1425 | return -EINVAL; | |
1426 | ||
1427 | mutex_lock(&devfreq_list_lock); | |
23c7b54c | 1428 | governor = try_then_request_governor(str_governor); |
0359d1af NM |
1429 | if (IS_ERR(governor)) { |
1430 | ret = PTR_ERR(governor); | |
1431 | goto out; | |
1432 | } | |
14a21e7b TJ |
1433 | if (df->governor == governor) { |
1434 | ret = 0; | |
0359d1af | 1435 | goto out; |
0dd25a0d CC |
1436 | } else if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE) |
1437 | || IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE)) { | |
bcf23c79 CC |
1438 | ret = -EINVAL; |
1439 | goto out; | |
14a21e7b | 1440 | } |
0359d1af | 1441 | |
5f1a9066 CC |
1442 | /* |
1443 | * Stop the current governor and remove the specific sysfs files | |
1444 | * which depend on current governor. | |
1445 | */ | |
483d557e CC |
1446 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); |
1447 | if (ret) { | |
1448 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1449 | __func__, df->governor->name, ret); | |
1450 | goto out; | |
0359d1af | 1451 | } |
5f1a9066 | 1452 | remove_sysfs_files(df, df->governor); |
483d557e | 1453 | |
5f1a9066 CC |
1454 | /* |
1455 | * Start the new governor and create the specific sysfs files | |
1456 | * which depend on the new governor. | |
1457 | */ | |
bc658bef | 1458 | prev_governor = df->governor; |
0359d1af | 1459 | df->governor = governor; |
0359d1af | 1460 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); |
bc658bef | 1461 | if (ret) { |
0359d1af NM |
1462 | dev_warn(dev, "%s: Governor %s not started(%d)\n", |
1463 | __func__, df->governor->name, ret); | |
5f1a9066 CC |
1464 | |
1465 | /* Restore previous governor */ | |
bc658bef | 1466 | df->governor = prev_governor; |
bc658bef SK |
1467 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); |
1468 | if (ret) { | |
1469 | dev_err(dev, | |
1470 | "%s: reverting to Governor %s failed (%d)\n", | |
96ffcdf2 | 1471 | __func__, prev_governor->name, ret); |
bc658bef | 1472 | df->governor = NULL; |
5f1a9066 | 1473 | goto out; |
bc658bef SK |
1474 | } |
1475 | } | |
5f1a9066 CC |
1476 | |
1477 | /* | |
1478 | * Create the sysfs files for the new governor. But if failed to start | |
1479 | * the new governor, restore the sysfs files of previous governor. | |
1480 | */ | |
1481 | create_sysfs_files(df, df->governor); | |
1482 | ||
0359d1af NM |
1483 | out: |
1484 | mutex_unlock(&devfreq_list_lock); | |
1485 | ||
1486 | if (!ret) | |
1487 | ret = count; | |
1488 | return ret; | |
1489 | } | |
a93d6b0a GKH |
1490 | static DEVICE_ATTR_RW(governor); |
1491 | ||
1492 | static ssize_t available_governors_show(struct device *d, | |
1493 | struct device_attribute *attr, | |
1494 | char *buf) | |
50a5b33e | 1495 | { |
bcf23c79 | 1496 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1497 | ssize_t count = 0; |
1498 | ||
483d557e CC |
1499 | if (!df->governor) |
1500 | return -EINVAL; | |
1501 | ||
50a5b33e | 1502 | mutex_lock(&devfreq_list_lock); |
bcf23c79 CC |
1503 | |
1504 | /* | |
1505 | * The devfreq with immutable governor (e.g., passive) shows | |
1506 | * only own governor. | |
1507 | */ | |
0dd25a0d | 1508 | if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) { |
bcf23c79 | 1509 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, |
96ffcdf2 | 1510 | "%s ", df->governor->name); |
bcf23c79 CC |
1511 | /* |
1512 | * The devfreq device shows the registered governor except for | |
1513 | * immutable governors such as passive governor . | |
1514 | */ | |
1515 | } else { | |
1516 | struct devfreq_governor *governor; | |
1517 | ||
1518 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
0dd25a0d | 1519 | if (IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE)) |
bcf23c79 CC |
1520 | continue; |
1521 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1522 | "%s ", governor->name); | |
1523 | } | |
1524 | } | |
1525 | ||
50a5b33e NM |
1526 | mutex_unlock(&devfreq_list_lock); |
1527 | ||
1528 | /* Truncate the trailing space */ | |
1529 | if (count) | |
1530 | count--; | |
1531 | ||
1532 | count += sprintf(&buf[count], "\n"); | |
1533 | ||
1534 | return count; | |
1535 | } | |
a93d6b0a | 1536 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1537 | |
a93d6b0a GKH |
1538 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1539 | char *buf) | |
7f98a905 RV |
1540 | { |
1541 | unsigned long freq; | |
483d557e | 1542 | struct devfreq *df = to_devfreq(dev); |
7f98a905 | 1543 | |
483d557e CC |
1544 | if (!df->profile) |
1545 | return -EINVAL; | |
1546 | ||
1547 | if (df->profile->get_cur_freq && | |
1548 | !df->profile->get_cur_freq(df->dev.parent, &freq)) | |
9d0109be | 1549 | return sprintf(buf, "%lu\n", freq); |
7f98a905 | 1550 | |
483d557e | 1551 | return sprintf(buf, "%lu\n", df->previous_freq); |
7f98a905 | 1552 | } |
a93d6b0a | 1553 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1554 | |
a93d6b0a GKH |
1555 | static ssize_t target_freq_show(struct device *dev, |
1556 | struct device_attribute *attr, char *buf) | |
9005b650 | 1557 | { |
483d557e CC |
1558 | struct devfreq *df = to_devfreq(dev); |
1559 | ||
1560 | return sprintf(buf, "%lu\n", df->previous_freq); | |
9005b650 | 1561 | } |
a93d6b0a | 1562 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1563 | |
a93d6b0a | 1564 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1565 | const char *buf, size_t count) |
1566 | { | |
1567 | struct devfreq *df = to_devfreq(dev); | |
1568 | unsigned long value; | |
1569 | int ret; | |
6530b9de | 1570 | |
27dbc542 LC |
1571 | /* |
1572 | * Protect against theoretical sysfs writes between | |
1573 | * device_add and dev_pm_qos_add_request | |
1574 | */ | |
1575 | if (!dev_pm_qos_request_active(&df->user_min_freq_req)) | |
1576 | return -EAGAIN; | |
1577 | ||
6530b9de MH |
1578 | ret = sscanf(buf, "%lu", &value); |
1579 | if (ret != 1) | |
12e26265 | 1580 | return -EINVAL; |
6530b9de | 1581 | |
27dbc542 LC |
1582 | /* Round down to kHz for PM QoS */ |
1583 | ret = dev_pm_qos_update_request(&df->user_min_freq_req, | |
1584 | value / HZ_PER_KHZ); | |
1585 | if (ret < 0) | |
1586 | return ret; | |
46cecc0b LC |
1587 | |
1588 | return count; | |
6530b9de MH |
1589 | } |
1590 | ||
1051e2c3 CC |
1591 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1592 | char *buf) | |
1593 | { | |
f1d981ea | 1594 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1595 | unsigned long min_freq, max_freq; |
1596 | ||
1597 | mutex_lock(&df->lock); | |
713472e5 | 1598 | devfreq_get_freq_range(df, &min_freq, &max_freq); |
46cecc0b | 1599 | mutex_unlock(&df->lock); |
f1d981ea | 1600 | |
46cecc0b | 1601 | return sprintf(buf, "%lu\n", min_freq); |
1051e2c3 | 1602 | } |
f9002b16 | 1603 | static DEVICE_ATTR_RW(min_freq); |
1051e2c3 | 1604 | |
a93d6b0a | 1605 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1606 | const char *buf, size_t count) |
1607 | { | |
1608 | struct devfreq *df = to_devfreq(dev); | |
1609 | unsigned long value; | |
1610 | int ret; | |
6530b9de | 1611 | |
27dbc542 LC |
1612 | /* |
1613 | * Protect against theoretical sysfs writes between | |
1614 | * device_add and dev_pm_qos_add_request | |
1615 | */ | |
1616 | if (!dev_pm_qos_request_active(&df->user_max_freq_req)) | |
1617 | return -EINVAL; | |
1618 | ||
6530b9de MH |
1619 | ret = sscanf(buf, "%lu", &value); |
1620 | if (ret != 1) | |
12e26265 | 1621 | return -EINVAL; |
6530b9de | 1622 | |
27dbc542 LC |
1623 | /* |
1624 | * PM QoS frequencies are in kHz so we need to convert. Convert by | |
1625 | * rounding upwards so that the acceptable interval never shrinks. | |
1626 | * | |
1627 | * For example if the user writes "666666666" to sysfs this value will | |
1628 | * be converted to 666667 kHz and back to 666667000 Hz before an OPP | |
1629 | * lookup, this ensures that an OPP of 666666666Hz is still accepted. | |
1630 | * | |
1631 | * A value of zero means "no limit". | |
1632 | */ | |
1633 | if (value) | |
1634 | value = DIV_ROUND_UP(value, HZ_PER_KHZ); | |
1635 | else | |
1636 | value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE; | |
6530b9de | 1637 | |
27dbc542 LC |
1638 | ret = dev_pm_qos_update_request(&df->user_max_freq_req, value); |
1639 | if (ret < 0) | |
1640 | return ret; | |
46cecc0b LC |
1641 | |
1642 | return count; | |
6530b9de MH |
1643 | } |
1644 | ||
1051e2c3 CC |
1645 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1646 | char *buf) | |
1647 | { | |
f1d981ea | 1648 | struct devfreq *df = to_devfreq(dev); |
46cecc0b LC |
1649 | unsigned long min_freq, max_freq; |
1650 | ||
1651 | mutex_lock(&df->lock); | |
713472e5 | 1652 | devfreq_get_freq_range(df, &min_freq, &max_freq); |
46cecc0b | 1653 | mutex_unlock(&df->lock); |
f1d981ea | 1654 | |
46cecc0b | 1655 | return sprintf(buf, "%lu\n", max_freq); |
6530b9de | 1656 | } |
a93d6b0a | 1657 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1658 | |
a93d6b0a GKH |
1659 | static ssize_t available_frequencies_show(struct device *d, |
1660 | struct device_attribute *attr, | |
1661 | char *buf) | |
d287de85 NM |
1662 | { |
1663 | struct devfreq *df = to_devfreq(d); | |
d287de85 | 1664 | ssize_t count = 0; |
416b46a2 | 1665 | int i; |
d287de85 | 1666 | |
483d557e CC |
1667 | if (!df->profile) |
1668 | return -EINVAL; | |
1669 | ||
416b46a2 | 1670 | mutex_lock(&df->lock); |
d287de85 | 1671 | |
b5d281f6 | 1672 | for (i = 0; i < df->max_state; i++) |
d287de85 | 1673 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
b5d281f6 | 1674 | "%lu ", df->freq_table[i]); |
d287de85 | 1675 | |
416b46a2 | 1676 | mutex_unlock(&df->lock); |
d287de85 NM |
1677 | /* Truncate the trailing space */ |
1678 | if (count) | |
1679 | count--; | |
1680 | ||
1681 | count += sprintf(&buf[count], "\n"); | |
1682 | ||
1683 | return count; | |
1684 | } | |
a93d6b0a | 1685 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1686 | |
a93d6b0a GKH |
1687 | static ssize_t trans_stat_show(struct device *dev, |
1688 | struct device_attribute *attr, char *buf) | |
e552bbaf | 1689 | { |
483d557e | 1690 | struct devfreq *df = to_devfreq(dev); |
e552bbaf | 1691 | ssize_t len; |
39688ce6 | 1692 | int i, j; |
483d557e CC |
1693 | unsigned int max_state; |
1694 | ||
1695 | if (!df->profile) | |
1696 | return -EINVAL; | |
b5d281f6 | 1697 | max_state = df->max_state; |
e552bbaf | 1698 | |
34bd3220 MH |
1699 | if (max_state == 0) |
1700 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1701 | |
483d557e CC |
1702 | mutex_lock(&df->lock); |
1703 | if (!df->stop_polling && | |
1704 | devfreq_update_status(df, df->previous_freq)) { | |
1705 | mutex_unlock(&df->lock); | |
2abb0d52 LC |
1706 | return 0; |
1707 | } | |
483d557e | 1708 | mutex_unlock(&df->lock); |
2abb0d52 | 1709 | |
d7df1e46 CC |
1710 | len = sprintf(buf, " From : To\n"); |
1711 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1712 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1713 | len += sprintf(buf + len, "%10lu", |
b5d281f6 | 1714 | df->freq_table[i]); |
e552bbaf JL |
1715 | |
1716 | len += sprintf(buf + len, " time(ms)\n"); | |
1717 | ||
1718 | for (i = 0; i < max_state; i++) { | |
b5d281f6 | 1719 | if (df->freq_table[i] == df->previous_freq) |
e552bbaf | 1720 | len += sprintf(buf + len, "*"); |
b5d281f6 | 1721 | else |
e552bbaf | 1722 | len += sprintf(buf + len, " "); |
b5d281f6 CM |
1723 | |
1724 | len += sprintf(buf + len, "%10lu:", df->freq_table[i]); | |
e552bbaf | 1725 | for (j = 0; j < max_state; j++) |
d7df1e46 | 1726 | len += sprintf(buf + len, "%10u", |
483d557e | 1727 | df->stats.trans_table[(i * max_state) + j]); |
1ebd0bc0 | 1728 | |
b76b3479 | 1729 | len += sprintf(buf + len, "%10llu\n", (u64) |
483d557e | 1730 | jiffies64_to_msecs(df->stats.time_in_state[i])); |
e552bbaf JL |
1731 | } |
1732 | ||
1733 | len += sprintf(buf + len, "Total transition : %u\n", | |
483d557e | 1734 | df->stats.total_trans); |
e552bbaf JL |
1735 | return len; |
1736 | } | |
14a34396 KK |
1737 | |
1738 | static ssize_t trans_stat_store(struct device *dev, | |
1739 | struct device_attribute *attr, | |
1740 | const char *buf, size_t count) | |
1741 | { | |
1742 | struct devfreq *df = to_devfreq(dev); | |
1743 | int err, value; | |
1744 | ||
483d557e CC |
1745 | if (!df->profile) |
1746 | return -EINVAL; | |
1747 | ||
b5d281f6 | 1748 | if (df->max_state == 0) |
14a34396 KK |
1749 | return count; |
1750 | ||
1751 | err = kstrtoint(buf, 10, &value); | |
1752 | if (err || value != 0) | |
1753 | return -EINVAL; | |
1754 | ||
1755 | mutex_lock(&df->lock); | |
b5d281f6 | 1756 | memset(df->stats.time_in_state, 0, (df->max_state * |
1ebd0bc0 KK |
1757 | sizeof(*df->stats.time_in_state))); |
1758 | memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), | |
b5d281f6 CM |
1759 | df->max_state, |
1760 | df->max_state)); | |
1ebd0bc0 KK |
1761 | df->stats.total_trans = 0; |
1762 | df->stats.last_update = get_jiffies_64(); | |
14a34396 KK |
1763 | mutex_unlock(&df->lock); |
1764 | ||
1765 | return count; | |
1766 | } | |
1767 | static DEVICE_ATTR_RW(trans_stat); | |
a93d6b0a | 1768 | |
5f1a9066 CC |
1769 | static struct attribute *devfreq_attrs[] = { |
1770 | &dev_attr_name.attr, | |
1771 | &dev_attr_governor.attr, | |
1772 | &dev_attr_available_governors.attr, | |
1773 | &dev_attr_cur_freq.attr, | |
1774 | &dev_attr_available_frequencies.attr, | |
1775 | &dev_attr_target_freq.attr, | |
1776 | &dev_attr_min_freq.attr, | |
1777 | &dev_attr_max_freq.attr, | |
1778 | &dev_attr_trans_stat.attr, | |
1779 | NULL, | |
1780 | }; | |
1781 | ATTRIBUTE_GROUPS(devfreq); | |
1782 | ||
1783 | static ssize_t polling_interval_show(struct device *dev, | |
1784 | struct device_attribute *attr, char *buf) | |
1785 | { | |
1786 | struct devfreq *df = to_devfreq(dev); | |
1787 | ||
1788 | if (!df->profile) | |
1789 | return -EINVAL; | |
1790 | ||
1791 | return sprintf(buf, "%d\n", df->profile->polling_ms); | |
1792 | } | |
1793 | ||
1794 | static ssize_t polling_interval_store(struct device *dev, | |
1795 | struct device_attribute *attr, | |
1796 | const char *buf, size_t count) | |
1797 | { | |
1798 | struct devfreq *df = to_devfreq(dev); | |
1799 | unsigned int value; | |
1800 | int ret; | |
1801 | ||
1802 | if (!df->governor) | |
1803 | return -EINVAL; | |
1804 | ||
1805 | ret = sscanf(buf, "%u", &value); | |
1806 | if (ret != 1) | |
1807 | return -EINVAL; | |
1808 | ||
1809 | df->governor->event_handler(df, DEVFREQ_GOV_UPDATE_INTERVAL, &value); | |
1810 | ret = count; | |
1811 | ||
1812 | return ret; | |
1813 | } | |
1814 | static DEVICE_ATTR_RW(polling_interval); | |
1815 | ||
4dc3bab8 CC |
1816 | static ssize_t timer_show(struct device *dev, |
1817 | struct device_attribute *attr, char *buf) | |
1818 | { | |
1819 | struct devfreq *df = to_devfreq(dev); | |
1820 | ||
1821 | if (!df->profile) | |
1822 | return -EINVAL; | |
1823 | ||
1824 | return sprintf(buf, "%s\n", timer_name[df->profile->timer]); | |
1825 | } | |
1826 | ||
1827 | static ssize_t timer_store(struct device *dev, struct device_attribute *attr, | |
1828 | const char *buf, size_t count) | |
1829 | { | |
1830 | struct devfreq *df = to_devfreq(dev); | |
1831 | char str_timer[DEVFREQ_NAME_LEN + 1]; | |
1832 | int timer = -1; | |
1833 | int ret = 0, i; | |
1834 | ||
1835 | if (!df->governor || !df->profile) | |
1836 | return -EINVAL; | |
1837 | ||
1838 | ret = sscanf(buf, "%16s", str_timer); | |
1839 | if (ret != 1) | |
1840 | return -EINVAL; | |
1841 | ||
1842 | for (i = 0; i < DEVFREQ_TIMER_NUM; i++) { | |
1843 | if (!strncmp(timer_name[i], str_timer, DEVFREQ_NAME_LEN)) { | |
1844 | timer = i; | |
1845 | break; | |
1846 | } | |
1847 | } | |
1848 | ||
1849 | if (timer < 0) { | |
1850 | ret = -EINVAL; | |
1851 | goto out; | |
1852 | } | |
1853 | ||
1854 | if (df->profile->timer == timer) { | |
1855 | ret = 0; | |
1856 | goto out; | |
1857 | } | |
1858 | ||
1859 | mutex_lock(&df->lock); | |
1860 | df->profile->timer = timer; | |
1861 | mutex_unlock(&df->lock); | |
1862 | ||
1863 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1864 | if (ret) { | |
1865 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1866 | __func__, df->governor->name, ret); | |
1867 | goto out; | |
1868 | } | |
1869 | ||
1870 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1871 | if (ret) | |
1872 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
1873 | __func__, df->governor->name, ret); | |
1874 | out: | |
1875 | return ret ? ret : count; | |
1876 | } | |
1877 | static DEVICE_ATTR_RW(timer); | |
1878 | ||
5f1a9066 CC |
1879 | #define CREATE_SYSFS_FILE(df, name) \ |
1880 | { \ | |
1881 | int ret; \ | |
1882 | ret = sysfs_create_file(&df->dev.kobj, &dev_attr_##name.attr); \ | |
1883 | if (ret < 0) { \ | |
1884 | dev_warn(&df->dev, \ | |
1885 | "Unable to create attr(%s)\n", "##name"); \ | |
1886 | } \ | |
1887 | } \ | |
1888 | ||
1889 | /* Create the specific sysfs files which depend on each governor. */ | |
1890 | static void create_sysfs_files(struct devfreq *devfreq, | |
1891 | const struct devfreq_governor *gov) | |
1892 | { | |
1893 | if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL)) | |
1894 | CREATE_SYSFS_FILE(devfreq, polling_interval); | |
1895 | if (IS_SUPPORTED_ATTR(gov->attrs, TIMER)) | |
1896 | CREATE_SYSFS_FILE(devfreq, timer); | |
1897 | } | |
1898 | ||
1899 | /* Remove the specific sysfs files which depend on each governor. */ | |
1900 | static void remove_sysfs_files(struct devfreq *devfreq, | |
1901 | const struct devfreq_governor *gov) | |
1902 | { | |
1903 | if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL)) | |
1904 | sysfs_remove_file(&devfreq->dev.kobj, | |
1905 | &dev_attr_polling_interval.attr); | |
1906 | if (IS_SUPPORTED_ATTR(gov->attrs, TIMER)) | |
1907 | sysfs_remove_file(&devfreq->dev.kobj, &dev_attr_timer.attr); | |
1908 | } | |
9005b650 | 1909 | |
490a421b CC |
1910 | /** |
1911 | * devfreq_summary_show() - Show the summary of the devfreq devices | |
1912 | * @s: seq_file instance to show the summary of devfreq devices | |
1913 | * @data: not used | |
1914 | * | |
1915 | * Show the summary of the devfreq devices via 'devfreq_summary' debugfs file. | |
1916 | * It helps that user can know the detailed information of the devfreq devices. | |
1917 | * | |
1918 | * Return 0 always because it shows the information without any data change. | |
1919 | */ | |
1920 | static int devfreq_summary_show(struct seq_file *s, void *data) | |
1921 | { | |
1922 | struct devfreq *devfreq; | |
1923 | struct devfreq *p_devfreq = NULL; | |
1924 | unsigned long cur_freq, min_freq, max_freq; | |
1925 | unsigned int polling_ms; | |
0c309ed1 | 1926 | unsigned int timer; |
490a421b | 1927 | |
0c309ed1 | 1928 | seq_printf(s, "%-30s %-30s %-15s %-10s %10s %12s %12s %12s\n", |
490a421b CC |
1929 | "dev", |
1930 | "parent_dev", | |
1931 | "governor", | |
0c309ed1 | 1932 | "timer", |
490a421b CC |
1933 | "polling_ms", |
1934 | "cur_freq_Hz", | |
1935 | "min_freq_Hz", | |
1936 | "max_freq_Hz"); | |
0c309ed1 | 1937 | seq_printf(s, "%30s %30s %15s %10s %10s %12s %12s %12s\n", |
0aae11bc | 1938 | "------------------------------", |
490a421b | 1939 | "------------------------------", |
490a421b CC |
1940 | "---------------", |
1941 | "----------", | |
0c309ed1 | 1942 | "----------", |
490a421b CC |
1943 | "------------", |
1944 | "------------", | |
1945 | "------------"); | |
1946 | ||
1947 | mutex_lock(&devfreq_list_lock); | |
1948 | ||
1949 | list_for_each_entry_reverse(devfreq, &devfreq_list, node) { | |
1950 | #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) | |
96ffcdf2 | 1951 | if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE, |
490a421b CC |
1952 | DEVFREQ_NAME_LEN)) { |
1953 | struct devfreq_passive_data *data = devfreq->data; | |
1954 | ||
1955 | if (data) | |
1956 | p_devfreq = data->parent; | |
1957 | } else { | |
1958 | p_devfreq = NULL; | |
1959 | } | |
1960 | #endif | |
1961 | ||
1962 | mutex_lock(&devfreq->lock); | |
27a69714 | 1963 | cur_freq = devfreq->previous_freq; |
713472e5 | 1964 | devfreq_get_freq_range(devfreq, &min_freq, &max_freq); |
0c309ed1 | 1965 | timer = devfreq->profile->timer; |
5f1a9066 CC |
1966 | |
1967 | if (IS_SUPPORTED_ATTR(devfreq->governor->attrs, POLLING_INTERVAL)) | |
1968 | polling_ms = devfreq->profile->polling_ms; | |
1969 | else | |
1970 | polling_ms = 0; | |
490a421b CC |
1971 | mutex_unlock(&devfreq->lock); |
1972 | ||
1973 | seq_printf(s, | |
0c309ed1 | 1974 | "%-30s %-30s %-15s %-10s %10d %12ld %12ld %12ld\n", |
490a421b CC |
1975 | dev_name(&devfreq->dev), |
1976 | p_devfreq ? dev_name(&p_devfreq->dev) : "null", | |
96ffcdf2 | 1977 | devfreq->governor->name, |
0c309ed1 | 1978 | polling_ms ? timer_name[timer] : "null", |
490a421b CC |
1979 | polling_ms, |
1980 | cur_freq, | |
1981 | min_freq, | |
1982 | max_freq); | |
1983 | } | |
1984 | ||
1985 | mutex_unlock(&devfreq_list_lock); | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | DEFINE_SHOW_ATTRIBUTE(devfreq_summary); | |
1990 | ||
a3c98b8b MH |
1991 | static int __init devfreq_init(void) |
1992 | { | |
1993 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1994 | if (IS_ERR(devfreq_class)) { | |
1995 | pr_err("%s: couldn't create class\n", __FILE__); | |
1996 | return PTR_ERR(devfreq_class); | |
1997 | } | |
7e6fdd4b RV |
1998 | |
1999 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 2000 | if (!devfreq_wq) { |
7e6fdd4b RV |
2001 | class_destroy(devfreq_class); |
2002 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 2003 | return -ENOMEM; |
7e6fdd4b | 2004 | } |
a93d6b0a | 2005 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 2006 | |
490a421b CC |
2007 | devfreq_debugfs = debugfs_create_dir("devfreq", NULL); |
2008 | debugfs_create_file("devfreq_summary", 0444, | |
2009 | devfreq_debugfs, NULL, | |
2010 | &devfreq_summary_fops); | |
2011 | ||
a3c98b8b MH |
2012 | return 0; |
2013 | } | |
2014 | subsys_initcall(devfreq_init); | |
2015 | ||
a3c98b8b | 2016 | /* |
4091fb95 | 2017 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
2018 | * OPP framework. |
2019 | */ | |
2020 | ||
2021 | /** | |
2022 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
2023 | * freq value given to target callback. | |
c5b4a1c1 NM |
2024 | * @dev: The devfreq user device. (parent of devfreq) |
2025 | * @freq: The frequency given to target function | |
2026 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 2027 | * |
8a31d9d9 VK |
2028 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
2029 | * use. | |
a3c98b8b | 2030 | */ |
47d43ba7 NM |
2031 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
2032 | unsigned long *freq, | |
2033 | u32 flags) | |
a3c98b8b | 2034 | { |
47d43ba7 | 2035 | struct dev_pm_opp *opp; |
a3c98b8b | 2036 | |
ab5f299f MH |
2037 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
2038 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 2039 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
2040 | |
2041 | /* If not available, use the closest opp */ | |
0779726c | 2042 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 2043 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
2044 | } else { |
2045 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 2046 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
2047 | |
2048 | /* If not available, use the closest opp */ | |
0779726c | 2049 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 2050 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
2051 | } |
2052 | ||
a3c98b8b MH |
2053 | return opp; |
2054 | } | |
bd7e9277 | 2055 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
2056 | |
2057 | /** | |
2058 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
6d690f77 MH |
2059 | * for any changes in the OPP availability |
2060 | * changes | |
c5b4a1c1 NM |
2061 | * @dev: The devfreq user device. (parent of devfreq) |
2062 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
2063 | */ |
2064 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
2065 | { | |
dc2c9ad5 | 2066 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 2067 | } |
bd7e9277 | 2068 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
2069 | |
2070 | /** | |
2071 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
6d690f77 MH |
2072 | * notified for any changes in the OPP |
2073 | * availability changes anymore. | |
c5b4a1c1 NM |
2074 | * @dev: The devfreq user device. (parent of devfreq) |
2075 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
2076 | * |
2077 | * At exit() callback of devfreq_dev_profile, this must be included if | |
2078 | * devfreq_recommended_opp is used. | |
2079 | */ | |
2080 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
2081 | { | |
dc2c9ad5 | 2082 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 2083 | } |
bd7e9277 | 2084 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 2085 | |
d5b040d0 CC |
2086 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
2087 | { | |
2088 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
2089 | } | |
2090 | ||
2091 | /** | |
6d690f77 MH |
2092 | * devm_devfreq_register_opp_notifier() - Resource-managed |
2093 | * devfreq_register_opp_notifier() | |
d5b040d0 CC |
2094 | * @dev: The devfreq user device. (parent of devfreq) |
2095 | * @devfreq: The devfreq object. | |
2096 | */ | |
2097 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
2098 | struct devfreq *devfreq) | |
2099 | { | |
2100 | struct devfreq **ptr; | |
2101 | int ret; | |
2102 | ||
2103 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
2104 | if (!ptr) | |
2105 | return -ENOMEM; | |
2106 | ||
2107 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
2108 | if (ret) { | |
2109 | devres_free(ptr); | |
2110 | return ret; | |
2111 | } | |
2112 | ||
2113 | *ptr = devfreq; | |
2114 | devres_add(dev, ptr); | |
2115 | ||
2116 | return 0; | |
2117 | } | |
2118 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
2119 | ||
2120 | /** | |
6d690f77 MH |
2121 | * devm_devfreq_unregister_opp_notifier() - Resource-managed |
2122 | * devfreq_unregister_opp_notifier() | |
d5b040d0 CC |
2123 | * @dev: The devfreq user device. (parent of devfreq) |
2124 | * @devfreq: The devfreq object. | |
2125 | */ | |
2126 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
2127 | struct devfreq *devfreq) | |
2128 | { | |
2129 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
2130 | devm_devfreq_dev_match, devfreq)); | |
2131 | } | |
2132 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
2133 | ||
0fe3a664 CC |
2134 | /** |
2135 | * devfreq_register_notifier() - Register a driver with devfreq | |
2136 | * @devfreq: The devfreq object. | |
2137 | * @nb: The notifier block to register. | |
2138 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2139 | */ | |
2140 | int devfreq_register_notifier(struct devfreq *devfreq, | |
6d690f77 MH |
2141 | struct notifier_block *nb, |
2142 | unsigned int list) | |
0fe3a664 CC |
2143 | { |
2144 | int ret = 0; | |
2145 | ||
2146 | if (!devfreq) | |
2147 | return -EINVAL; | |
2148 | ||
2149 | switch (list) { | |
2150 | case DEVFREQ_TRANSITION_NOTIFIER: | |
2151 | ret = srcu_notifier_chain_register( | |
2152 | &devfreq->transition_notifier_list, nb); | |
2153 | break; | |
2154 | default: | |
2155 | ret = -EINVAL; | |
2156 | } | |
2157 | ||
2158 | return ret; | |
2159 | } | |
2160 | EXPORT_SYMBOL(devfreq_register_notifier); | |
2161 | ||
2162 | /* | |
2163 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
2164 | * @devfreq: The devfreq object. | |
2165 | * @nb: The notifier block to be unregistered. | |
2166 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2167 | */ | |
2168 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
2169 | struct notifier_block *nb, | |
2170 | unsigned int list) | |
2171 | { | |
2172 | int ret = 0; | |
2173 | ||
2174 | if (!devfreq) | |
2175 | return -EINVAL; | |
2176 | ||
2177 | switch (list) { | |
2178 | case DEVFREQ_TRANSITION_NOTIFIER: | |
2179 | ret = srcu_notifier_chain_unregister( | |
2180 | &devfreq->transition_notifier_list, nb); | |
2181 | break; | |
2182 | default: | |
2183 | ret = -EINVAL; | |
2184 | } | |
2185 | ||
2186 | return ret; | |
2187 | } | |
2188 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
2189 | ||
2190 | struct devfreq_notifier_devres { | |
2191 | struct devfreq *devfreq; | |
2192 | struct notifier_block *nb; | |
2193 | unsigned int list; | |
2194 | }; | |
2195 | ||
2196 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
2197 | { | |
2198 | struct devfreq_notifier_devres *this = res; | |
2199 | ||
2200 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
2201 | } | |
2202 | ||
2203 | /** | |
2204 | * devm_devfreq_register_notifier() | |
54cb5740 | 2205 | * - Resource-managed devfreq_register_notifier() |
0fe3a664 CC |
2206 | * @dev: The devfreq user device. (parent of devfreq) |
2207 | * @devfreq: The devfreq object. | |
2208 | * @nb: The notifier block to be unregistered. | |
2209 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2210 | */ | |
2211 | int devm_devfreq_register_notifier(struct device *dev, | |
2212 | struct devfreq *devfreq, | |
2213 | struct notifier_block *nb, | |
2214 | unsigned int list) | |
2215 | { | |
2216 | struct devfreq_notifier_devres *ptr; | |
2217 | int ret; | |
2218 | ||
2219 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
2220 | GFP_KERNEL); | |
2221 | if (!ptr) | |
2222 | return -ENOMEM; | |
2223 | ||
2224 | ret = devfreq_register_notifier(devfreq, nb, list); | |
2225 | if (ret) { | |
2226 | devres_free(ptr); | |
2227 | return ret; | |
2228 | } | |
2229 | ||
2230 | ptr->devfreq = devfreq; | |
2231 | ptr->nb = nb; | |
2232 | ptr->list = list; | |
2233 | devres_add(dev, ptr); | |
2234 | ||
2235 | return 0; | |
2236 | } | |
2237 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
2238 | ||
2239 | /** | |
2240 | * devm_devfreq_unregister_notifier() | |
54cb5740 | 2241 | * - Resource-managed devfreq_unregister_notifier() |
0fe3a664 CC |
2242 | * @dev: The devfreq user device. (parent of devfreq) |
2243 | * @devfreq: The devfreq object. | |
2244 | * @nb: The notifier block to be unregistered. | |
2245 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
2246 | */ | |
2247 | void devm_devfreq_unregister_notifier(struct device *dev, | |
6d690f77 MH |
2248 | struct devfreq *devfreq, |
2249 | struct notifier_block *nb, | |
2250 | unsigned int list) | |
0fe3a664 CC |
2251 | { |
2252 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
2253 | devm_devfreq_dev_match, devfreq)); | |
2254 | } | |
2255 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |