Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/pm_runtime.h> | |
13 | #include <linux/pm_domain.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/err.h> | |
17b75eca RW |
16 | #include <linux/sched.h> |
17 | #include <linux/suspend.h> | |
f721889f | 18 | |
5248051b RW |
19 | #ifdef CONFIG_PM |
20 | ||
21 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
22 | { | |
23 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
24 | return ERR_PTR(-EINVAL); | |
25 | ||
596ba34b | 26 | return pd_to_genpd(dev->pm_domain); |
5248051b | 27 | } |
f721889f RW |
28 | |
29 | static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) | |
30 | { | |
31 | if (!WARN_ON(genpd->sd_count == 0)) | |
32 | genpd->sd_count--; | |
33 | } | |
34 | ||
17b75eca RW |
35 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
36 | { | |
37 | DEFINE_WAIT(wait); | |
38 | ||
39 | mutex_lock(&genpd->lock); | |
40 | /* | |
41 | * Wait for the domain to transition into either the active, | |
42 | * or the power off state. | |
43 | */ | |
44 | for (;;) { | |
45 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
46 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
47 | if (genpd->status == GPD_STATE_ACTIVE |
48 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
49 | break; |
50 | mutex_unlock(&genpd->lock); | |
51 | ||
52 | schedule(); | |
53 | ||
54 | mutex_lock(&genpd->lock); | |
55 | } | |
56 | finish_wait(&genpd->status_wait_queue, &wait); | |
57 | } | |
58 | ||
59 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
60 | { | |
61 | mutex_unlock(&genpd->lock); | |
62 | } | |
63 | ||
c6d22b37 RW |
64 | static void genpd_set_active(struct generic_pm_domain *genpd) |
65 | { | |
66 | if (genpd->resume_count == 0) | |
67 | genpd->status = GPD_STATE_ACTIVE; | |
68 | } | |
69 | ||
5248051b RW |
70 | /** |
71 | * pm_genpd_poweron - Restore power to a given PM domain and its parents. | |
72 | * @genpd: PM domain to power up. | |
73 | * | |
74 | * Restore power to @genpd and all of its parents so that it is possible to | |
75 | * resume a device belonging to it. | |
76 | */ | |
18b4f3f5 | 77 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 78 | { |
17b75eca RW |
79 | struct generic_pm_domain *parent = genpd->parent; |
80 | DEFINE_WAIT(wait); | |
5248051b RW |
81 | int ret = 0; |
82 | ||
83 | start: | |
17b75eca | 84 | if (parent) { |
c6d22b37 | 85 | genpd_acquire_lock(parent); |
17b75eca RW |
86 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
87 | } else { | |
88 | mutex_lock(&genpd->lock); | |
89 | } | |
17b75eca RW |
90 | |
91 | if (genpd->status == GPD_STATE_ACTIVE | |
596ba34b | 92 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
5248051b RW |
93 | goto out; |
94 | ||
c6d22b37 RW |
95 | if (genpd->status != GPD_STATE_POWER_OFF) { |
96 | genpd_set_active(genpd); | |
97 | goto out; | |
98 | } | |
99 | ||
17b75eca | 100 | if (parent && parent->status != GPD_STATE_ACTIVE) { |
5248051b | 101 | mutex_unlock(&genpd->lock); |
c6d22b37 | 102 | genpd_release_lock(parent); |
5248051b | 103 | |
17b75eca | 104 | ret = pm_genpd_poweron(parent); |
5248051b RW |
105 | if (ret) |
106 | return ret; | |
107 | ||
108 | goto start; | |
109 | } | |
110 | ||
111 | if (genpd->power_on) { | |
112 | int ret = genpd->power_on(genpd); | |
113 | if (ret) | |
114 | goto out; | |
115 | } | |
116 | ||
c6d22b37 | 117 | genpd_set_active(genpd); |
17b75eca RW |
118 | if (parent) |
119 | parent->sd_count++; | |
5248051b RW |
120 | |
121 | out: | |
122 | mutex_unlock(&genpd->lock); | |
17b75eca | 123 | if (parent) |
c6d22b37 | 124 | genpd_release_lock(parent); |
5248051b RW |
125 | |
126 | return ret; | |
127 | } | |
128 | ||
129 | #endif /* CONFIG_PM */ | |
130 | ||
131 | #ifdef CONFIG_PM_RUNTIME | |
132 | ||
f721889f RW |
133 | /** |
134 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
135 | * @dle: Device list entry of the device to save the state of. | |
136 | * @genpd: PM domain the device belongs to. | |
137 | */ | |
138 | static int __pm_genpd_save_device(struct dev_list_entry *dle, | |
139 | struct generic_pm_domain *genpd) | |
17b75eca | 140 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
141 | { |
142 | struct device *dev = dle->dev; | |
143 | struct device_driver *drv = dev->driver; | |
144 | int ret = 0; | |
145 | ||
146 | if (dle->need_restore) | |
147 | return 0; | |
148 | ||
17b75eca RW |
149 | mutex_unlock(&genpd->lock); |
150 | ||
f721889f RW |
151 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
152 | if (genpd->start_device) | |
153 | genpd->start_device(dev); | |
154 | ||
155 | ret = drv->pm->runtime_suspend(dev); | |
156 | ||
157 | if (genpd->stop_device) | |
158 | genpd->stop_device(dev); | |
159 | } | |
160 | ||
17b75eca RW |
161 | mutex_lock(&genpd->lock); |
162 | ||
f721889f RW |
163 | if (!ret) |
164 | dle->need_restore = true; | |
165 | ||
166 | return ret; | |
167 | } | |
168 | ||
169 | /** | |
170 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
171 | * @dle: Device list entry of the device to restore the state of. | |
172 | * @genpd: PM domain the device belongs to. | |
173 | */ | |
174 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, | |
175 | struct generic_pm_domain *genpd) | |
17b75eca | 176 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
177 | { |
178 | struct device *dev = dle->dev; | |
179 | struct device_driver *drv = dev->driver; | |
180 | ||
181 | if (!dle->need_restore) | |
182 | return; | |
183 | ||
17b75eca RW |
184 | mutex_unlock(&genpd->lock); |
185 | ||
f721889f RW |
186 | if (drv && drv->pm && drv->pm->runtime_resume) { |
187 | if (genpd->start_device) | |
188 | genpd->start_device(dev); | |
189 | ||
190 | drv->pm->runtime_resume(dev); | |
191 | ||
192 | if (genpd->stop_device) | |
193 | genpd->stop_device(dev); | |
194 | } | |
195 | ||
17b75eca RW |
196 | mutex_lock(&genpd->lock); |
197 | ||
f721889f RW |
198 | dle->need_restore = false; |
199 | } | |
200 | ||
c6d22b37 RW |
201 | /** |
202 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
203 | * @genpd: PM domain to check. | |
204 | * | |
205 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
206 | * a "power off" operation, which means that a "power on" has occured in the | |
207 | * meantime, or if its resume_count field is different from zero, which means | |
208 | * that one of its devices has been resumed in the meantime. | |
209 | */ | |
210 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
211 | { | |
212 | return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; | |
213 | } | |
214 | ||
56375fd4 RW |
215 | /** |
216 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
217 | * @genpd: PM domait to power off. | |
218 | * | |
219 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
220 | * before. | |
221 | */ | |
222 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
223 | { | |
224 | if (!work_pending(&genpd->power_off_work)) | |
225 | queue_work(pm_wq, &genpd->power_off_work); | |
226 | } | |
227 | ||
f721889f RW |
228 | /** |
229 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
230 | * @genpd: PM domain to power down. | |
231 | * | |
232 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
233 | * have been powered down, run the runtime suspend callbacks provided by all of | |
234 | * the @genpd's devices' drivers and remove power from @genpd. | |
235 | */ | |
236 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 237 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
238 | { |
239 | struct generic_pm_domain *parent; | |
240 | struct dev_list_entry *dle; | |
241 | unsigned int not_suspended; | |
c6d22b37 | 242 | int ret = 0; |
f721889f | 243 | |
c6d22b37 RW |
244 | start: |
245 | /* | |
246 | * Do not try to power off the domain in the following situations: | |
247 | * (1) The domain is already in the "power off" state. | |
248 | * (2) System suspend is in progress. | |
249 | * (3) One of the domain's devices is being resumed right now. | |
250 | */ | |
251 | if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 | |
252 | || genpd->resume_count > 0) | |
f721889f RW |
253 | return 0; |
254 | ||
255 | if (genpd->sd_count > 0) | |
256 | return -EBUSY; | |
257 | ||
258 | not_suspended = 0; | |
259 | list_for_each_entry(dle, &genpd->dev_list, node) | |
260 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) | |
261 | not_suspended++; | |
262 | ||
263 | if (not_suspended > genpd->in_progress) | |
264 | return -EBUSY; | |
265 | ||
c6d22b37 RW |
266 | if (genpd->poweroff_task) { |
267 | /* | |
268 | * Another instance of pm_genpd_poweroff() is executing | |
269 | * callbacks, so tell it to start over and return. | |
270 | */ | |
271 | genpd->status = GPD_STATE_REPEAT; | |
272 | return 0; | |
273 | } | |
274 | ||
f721889f RW |
275 | if (genpd->gov && genpd->gov->power_down_ok) { |
276 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
277 | return -EAGAIN; | |
278 | } | |
279 | ||
17b75eca | 280 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 281 | genpd->poweroff_task = current; |
17b75eca | 282 | |
f721889f RW |
283 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
284 | ret = __pm_genpd_save_device(dle, genpd); | |
697a7f37 RW |
285 | if (ret) { |
286 | genpd_set_active(genpd); | |
287 | goto out; | |
288 | } | |
f721889f | 289 | |
c6d22b37 RW |
290 | if (genpd_abort_poweroff(genpd)) |
291 | goto out; | |
292 | ||
293 | if (genpd->status == GPD_STATE_REPEAT) { | |
294 | genpd->poweroff_task = NULL; | |
295 | goto start; | |
296 | } | |
297 | } | |
17b75eca RW |
298 | |
299 | parent = genpd->parent; | |
300 | if (parent) { | |
c6d22b37 RW |
301 | mutex_unlock(&genpd->lock); |
302 | ||
17b75eca RW |
303 | genpd_acquire_lock(parent); |
304 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
c6d22b37 RW |
305 | |
306 | if (genpd_abort_poweroff(genpd)) { | |
307 | genpd_release_lock(parent); | |
308 | goto out; | |
309 | } | |
17b75eca RW |
310 | } |
311 | ||
f721889f RW |
312 | if (genpd->power_off) |
313 | genpd->power_off(genpd); | |
314 | ||
17b75eca | 315 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 316 | |
f721889f RW |
317 | if (parent) { |
318 | genpd_sd_counter_dec(parent); | |
319 | if (parent->sd_count == 0) | |
56375fd4 | 320 | genpd_queue_power_off_work(parent); |
17b75eca RW |
321 | |
322 | genpd_release_lock(parent); | |
f721889f RW |
323 | } |
324 | ||
c6d22b37 RW |
325 | out: |
326 | genpd->poweroff_task = NULL; | |
327 | wake_up_all(&genpd->status_wait_queue); | |
328 | return ret; | |
f721889f RW |
329 | } |
330 | ||
331 | /** | |
332 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
333 | * @work: Work structure used for scheduling the execution of this function. | |
334 | */ | |
335 | static void genpd_power_off_work_fn(struct work_struct *work) | |
336 | { | |
337 | struct generic_pm_domain *genpd; | |
338 | ||
339 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
340 | ||
17b75eca | 341 | genpd_acquire_lock(genpd); |
f721889f | 342 | pm_genpd_poweroff(genpd); |
17b75eca | 343 | genpd_release_lock(genpd); |
f721889f RW |
344 | } |
345 | ||
346 | /** | |
347 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
348 | * @dev: Device to suspend. | |
349 | * | |
350 | * Carry out a runtime suspend of a device under the assumption that its | |
351 | * pm_domain field points to the domain member of an object of type | |
352 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
353 | */ | |
354 | static int pm_genpd_runtime_suspend(struct device *dev) | |
355 | { | |
356 | struct generic_pm_domain *genpd; | |
357 | ||
358 | dev_dbg(dev, "%s()\n", __func__); | |
359 | ||
5248051b RW |
360 | genpd = dev_to_genpd(dev); |
361 | if (IS_ERR(genpd)) | |
f721889f RW |
362 | return -EINVAL; |
363 | ||
f721889f RW |
364 | if (genpd->stop_device) { |
365 | int ret = genpd->stop_device(dev); | |
366 | if (ret) | |
17b75eca | 367 | return ret; |
f721889f | 368 | } |
17b75eca | 369 | |
c6d22b37 | 370 | mutex_lock(&genpd->lock); |
f721889f RW |
371 | genpd->in_progress++; |
372 | pm_genpd_poweroff(genpd); | |
373 | genpd->in_progress--; | |
c6d22b37 | 374 | mutex_unlock(&genpd->lock); |
f721889f RW |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
596ba34b RW |
379 | /** |
380 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
381 | * @dev: Device to resume. | |
382 | * @genpd: PM domain the device belongs to. | |
383 | */ | |
384 | static void __pm_genpd_runtime_resume(struct device *dev, | |
385 | struct generic_pm_domain *genpd) | |
386 | { | |
387 | struct dev_list_entry *dle; | |
388 | ||
389 | list_for_each_entry(dle, &genpd->dev_list, node) { | |
390 | if (dle->dev == dev) { | |
391 | __pm_genpd_restore_device(dle, genpd); | |
392 | break; | |
393 | } | |
394 | } | |
596ba34b RW |
395 | } |
396 | ||
f721889f RW |
397 | /** |
398 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
399 | * @dev: Device to resume. | |
400 | * | |
401 | * Carry out a runtime resume of a device under the assumption that its | |
402 | * pm_domain field points to the domain member of an object of type | |
403 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
404 | */ | |
405 | static int pm_genpd_runtime_resume(struct device *dev) | |
406 | { | |
407 | struct generic_pm_domain *genpd; | |
c6d22b37 | 408 | DEFINE_WAIT(wait); |
f721889f RW |
409 | int ret; |
410 | ||
411 | dev_dbg(dev, "%s()\n", __func__); | |
412 | ||
5248051b RW |
413 | genpd = dev_to_genpd(dev); |
414 | if (IS_ERR(genpd)) | |
f721889f RW |
415 | return -EINVAL; |
416 | ||
f721889f RW |
417 | ret = pm_genpd_poweron(genpd); |
418 | if (ret) | |
419 | return ret; | |
420 | ||
c6d22b37 | 421 | mutex_lock(&genpd->lock); |
17b75eca | 422 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
423 | genpd->resume_count++; |
424 | for (;;) { | |
425 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
426 | TASK_UNINTERRUPTIBLE); | |
427 | /* | |
428 | * If current is the powering off task, we have been called | |
429 | * reentrantly from one of the device callbacks, so we should | |
430 | * not wait. | |
431 | */ | |
432 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
433 | break; | |
434 | mutex_unlock(&genpd->lock); | |
435 | ||
436 | schedule(); | |
437 | ||
438 | mutex_lock(&genpd->lock); | |
439 | } | |
440 | finish_wait(&genpd->status_wait_queue, &wait); | |
596ba34b | 441 | __pm_genpd_runtime_resume(dev, genpd); |
c6d22b37 RW |
442 | genpd->resume_count--; |
443 | genpd_set_active(genpd); | |
17b75eca | 444 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 445 | mutex_unlock(&genpd->lock); |
17b75eca RW |
446 | |
447 | if (genpd->start_device) | |
448 | genpd->start_device(dev); | |
f721889f RW |
449 | |
450 | return 0; | |
451 | } | |
452 | ||
453 | #else | |
454 | ||
455 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
596ba34b RW |
456 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
457 | struct generic_pm_domain *genpd) {} | |
f721889f RW |
458 | |
459 | #define pm_genpd_runtime_suspend NULL | |
460 | #define pm_genpd_runtime_resume NULL | |
461 | ||
462 | #endif /* CONFIG_PM_RUNTIME */ | |
463 | ||
596ba34b RW |
464 | #ifdef CONFIG_PM_SLEEP |
465 | ||
466 | /** | |
467 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. | |
468 | * @genpd: PM domain to power off, if possible. | |
469 | * | |
470 | * Check if the given PM domain can be powered off (during system suspend or | |
471 | * hibernation) and do that if so. Also, in that case propagate to its parent. | |
472 | * | |
473 | * This function is only called in "noirq" stages of system power transitions, | |
474 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
475 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
476 | */ | |
477 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
478 | { | |
479 | struct generic_pm_domain *parent = genpd->parent; | |
480 | ||
17b75eca | 481 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
482 | return; |
483 | ||
484 | if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) | |
485 | return; | |
486 | ||
487 | if (genpd->power_off) | |
488 | genpd->power_off(genpd); | |
489 | ||
17b75eca | 490 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
491 | if (parent) { |
492 | genpd_sd_counter_dec(parent); | |
493 | pm_genpd_sync_poweroff(parent); | |
494 | } | |
495 | } | |
496 | ||
4ecd6e65 RW |
497 | /** |
498 | * resume_needed - Check whether to resume a device before system suspend. | |
499 | * @dev: Device to check. | |
500 | * @genpd: PM domain the device belongs to. | |
501 | * | |
502 | * There are two cases in which a device that can wake up the system from sleep | |
503 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
504 | * to wake up the system and it has to remain active for this purpose while the | |
505 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
506 | * the system from sleep states and it generally doesn't generate wakeup signals | |
507 | * by itself (those signals are generated on its behalf by other parts of the | |
508 | * system). In the latter case it may be necessary to reconfigure the device's | |
509 | * wakeup settings during system suspend, because it may have been set up to | |
510 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
511 | * Return 'true' in either of the above cases. | |
512 | */ | |
513 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
514 | { | |
515 | bool active_wakeup; | |
516 | ||
517 | if (!device_can_wakeup(dev)) | |
518 | return false; | |
519 | ||
520 | active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); | |
521 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; | |
522 | } | |
523 | ||
596ba34b RW |
524 | /** |
525 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
526 | * @dev: Device to start the transition of. | |
527 | * | |
528 | * Start a power transition of a device (during a system-wide power transition) | |
529 | * under the assumption that its pm_domain field points to the domain member of | |
530 | * an object of type struct generic_pm_domain representing a PM domain | |
531 | * consisting of I/O devices. | |
532 | */ | |
533 | static int pm_genpd_prepare(struct device *dev) | |
534 | { | |
535 | struct generic_pm_domain *genpd; | |
b6c10c84 | 536 | int ret; |
596ba34b RW |
537 | |
538 | dev_dbg(dev, "%s()\n", __func__); | |
539 | ||
540 | genpd = dev_to_genpd(dev); | |
541 | if (IS_ERR(genpd)) | |
542 | return -EINVAL; | |
543 | ||
17b75eca RW |
544 | /* |
545 | * If a wakeup request is pending for the device, it should be woken up | |
546 | * at this point and a system wakeup event should be reported if it's | |
547 | * set up to wake up the system from sleep states. | |
548 | */ | |
549 | pm_runtime_get_noresume(dev); | |
550 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
551 | pm_wakeup_event(dev, 0); | |
552 | ||
553 | if (pm_wakeup_pending()) { | |
554 | pm_runtime_put_sync(dev); | |
555 | return -EBUSY; | |
556 | } | |
557 | ||
4ecd6e65 RW |
558 | if (resume_needed(dev, genpd)) |
559 | pm_runtime_resume(dev); | |
560 | ||
17b75eca | 561 | genpd_acquire_lock(genpd); |
596ba34b RW |
562 | |
563 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
564 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
565 | ||
566 | genpd_release_lock(genpd); | |
596ba34b RW |
567 | |
568 | if (genpd->suspend_power_off) { | |
17b75eca | 569 | pm_runtime_put_noidle(dev); |
596ba34b RW |
570 | return 0; |
571 | } | |
572 | ||
573 | /* | |
17b75eca RW |
574 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
575 | * so pm_genpd_poweron() will return immediately, but if the device | |
576 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
577 | * to make it operational. | |
596ba34b | 578 | */ |
17b75eca | 579 | pm_runtime_resume(dev); |
596ba34b RW |
580 | __pm_runtime_disable(dev, false); |
581 | ||
b6c10c84 RW |
582 | ret = pm_generic_prepare(dev); |
583 | if (ret) { | |
584 | mutex_lock(&genpd->lock); | |
585 | ||
586 | if (--genpd->prepared_count == 0) | |
587 | genpd->suspend_power_off = false; | |
588 | ||
589 | mutex_unlock(&genpd->lock); | |
17b75eca | 590 | pm_runtime_enable(dev); |
b6c10c84 | 591 | } |
17b75eca RW |
592 | |
593 | pm_runtime_put_sync(dev); | |
b6c10c84 | 594 | return ret; |
596ba34b RW |
595 | } |
596 | ||
597 | /** | |
598 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
599 | * @dev: Device to suspend. | |
600 | * | |
601 | * Suspend a device under the assumption that its pm_domain field points to the | |
602 | * domain member of an object of type struct generic_pm_domain representing | |
603 | * a PM domain consisting of I/O devices. | |
604 | */ | |
605 | static int pm_genpd_suspend(struct device *dev) | |
606 | { | |
607 | struct generic_pm_domain *genpd; | |
608 | ||
609 | dev_dbg(dev, "%s()\n", __func__); | |
610 | ||
611 | genpd = dev_to_genpd(dev); | |
612 | if (IS_ERR(genpd)) | |
613 | return -EINVAL; | |
614 | ||
615 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
616 | } | |
617 | ||
618 | /** | |
619 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
620 | * @dev: Device to suspend. | |
621 | * | |
622 | * Carry out a late suspend of a device under the assumption that its | |
623 | * pm_domain field points to the domain member of an object of type | |
624 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
625 | */ | |
626 | static int pm_genpd_suspend_noirq(struct device *dev) | |
627 | { | |
628 | struct generic_pm_domain *genpd; | |
629 | int ret; | |
630 | ||
631 | dev_dbg(dev, "%s()\n", __func__); | |
632 | ||
633 | genpd = dev_to_genpd(dev); | |
634 | if (IS_ERR(genpd)) | |
635 | return -EINVAL; | |
636 | ||
637 | if (genpd->suspend_power_off) | |
638 | return 0; | |
639 | ||
640 | ret = pm_generic_suspend_noirq(dev); | |
641 | if (ret) | |
642 | return ret; | |
643 | ||
d4f2d87a RW |
644 | if (device_may_wakeup(dev) |
645 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
646 | return 0; | |
647 | ||
596ba34b RW |
648 | if (genpd->stop_device) |
649 | genpd->stop_device(dev); | |
650 | ||
651 | /* | |
652 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
653 | * guaranteed that this function will never run twice in parallel for | |
654 | * the same PM domain, so it is not necessary to use locking here. | |
655 | */ | |
656 | genpd->suspended_count++; | |
657 | pm_genpd_sync_poweroff(genpd); | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | /** | |
663 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
664 | * @dev: Device to resume. | |
665 | * | |
666 | * Carry out an early resume of a device under the assumption that its | |
667 | * pm_domain field points to the domain member of an object of type | |
668 | * struct generic_pm_domain representing a power domain consisting of I/O | |
669 | * devices. | |
670 | */ | |
671 | static int pm_genpd_resume_noirq(struct device *dev) | |
672 | { | |
673 | struct generic_pm_domain *genpd; | |
674 | ||
675 | dev_dbg(dev, "%s()\n", __func__); | |
676 | ||
677 | genpd = dev_to_genpd(dev); | |
678 | if (IS_ERR(genpd)) | |
679 | return -EINVAL; | |
680 | ||
681 | if (genpd->suspend_power_off) | |
682 | return 0; | |
683 | ||
684 | /* | |
685 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
686 | * guaranteed that this function will never run twice in parallel for | |
687 | * the same PM domain, so it is not necessary to use locking here. | |
688 | */ | |
689 | pm_genpd_poweron(genpd); | |
690 | genpd->suspended_count--; | |
691 | if (genpd->start_device) | |
692 | genpd->start_device(dev); | |
693 | ||
694 | return pm_generic_resume_noirq(dev); | |
695 | } | |
696 | ||
697 | /** | |
698 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
699 | * @dev: Device to resume. | |
700 | * | |
701 | * Resume a device under the assumption that its pm_domain field points to the | |
702 | * domain member of an object of type struct generic_pm_domain representing | |
703 | * a power domain consisting of I/O devices. | |
704 | */ | |
705 | static int pm_genpd_resume(struct device *dev) | |
706 | { | |
707 | struct generic_pm_domain *genpd; | |
708 | ||
709 | dev_dbg(dev, "%s()\n", __func__); | |
710 | ||
711 | genpd = dev_to_genpd(dev); | |
712 | if (IS_ERR(genpd)) | |
713 | return -EINVAL; | |
714 | ||
715 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
716 | } | |
717 | ||
718 | /** | |
719 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
720 | * @dev: Device to freeze. | |
721 | * | |
722 | * Freeze a device under the assumption that its pm_domain field points to the | |
723 | * domain member of an object of type struct generic_pm_domain representing | |
724 | * a power domain consisting of I/O devices. | |
725 | */ | |
726 | static int pm_genpd_freeze(struct device *dev) | |
727 | { | |
728 | struct generic_pm_domain *genpd; | |
729 | ||
730 | dev_dbg(dev, "%s()\n", __func__); | |
731 | ||
732 | genpd = dev_to_genpd(dev); | |
733 | if (IS_ERR(genpd)) | |
734 | return -EINVAL; | |
735 | ||
736 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
737 | } | |
738 | ||
739 | /** | |
740 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
741 | * @dev: Device to freeze. | |
742 | * | |
743 | * Carry out a late freeze of a device under the assumption that its | |
744 | * pm_domain field points to the domain member of an object of type | |
745 | * struct generic_pm_domain representing a power domain consisting of I/O | |
746 | * devices. | |
747 | */ | |
748 | static int pm_genpd_freeze_noirq(struct device *dev) | |
749 | { | |
750 | struct generic_pm_domain *genpd; | |
751 | int ret; | |
752 | ||
753 | dev_dbg(dev, "%s()\n", __func__); | |
754 | ||
755 | genpd = dev_to_genpd(dev); | |
756 | if (IS_ERR(genpd)) | |
757 | return -EINVAL; | |
758 | ||
759 | if (genpd->suspend_power_off) | |
760 | return 0; | |
761 | ||
762 | ret = pm_generic_freeze_noirq(dev); | |
763 | if (ret) | |
764 | return ret; | |
765 | ||
766 | if (genpd->stop_device) | |
767 | genpd->stop_device(dev); | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | /** | |
773 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
774 | * @dev: Device to thaw. | |
775 | * | |
776 | * Carry out an early thaw of a device under the assumption that its | |
777 | * pm_domain field points to the domain member of an object of type | |
778 | * struct generic_pm_domain representing a power domain consisting of I/O | |
779 | * devices. | |
780 | */ | |
781 | static int pm_genpd_thaw_noirq(struct device *dev) | |
782 | { | |
783 | struct generic_pm_domain *genpd; | |
784 | ||
785 | dev_dbg(dev, "%s()\n", __func__); | |
786 | ||
787 | genpd = dev_to_genpd(dev); | |
788 | if (IS_ERR(genpd)) | |
789 | return -EINVAL; | |
790 | ||
791 | if (genpd->suspend_power_off) | |
792 | return 0; | |
793 | ||
794 | if (genpd->start_device) | |
795 | genpd->start_device(dev); | |
796 | ||
797 | return pm_generic_thaw_noirq(dev); | |
798 | } | |
799 | ||
800 | /** | |
801 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
802 | * @dev: Device to thaw. | |
803 | * | |
804 | * Thaw a device under the assumption that its pm_domain field points to the | |
805 | * domain member of an object of type struct generic_pm_domain representing | |
806 | * a power domain consisting of I/O devices. | |
807 | */ | |
808 | static int pm_genpd_thaw(struct device *dev) | |
809 | { | |
810 | struct generic_pm_domain *genpd; | |
811 | ||
812 | dev_dbg(dev, "%s()\n", __func__); | |
813 | ||
814 | genpd = dev_to_genpd(dev); | |
815 | if (IS_ERR(genpd)) | |
816 | return -EINVAL; | |
817 | ||
818 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
819 | } | |
820 | ||
821 | /** | |
822 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
823 | * @dev: Device to suspend. | |
824 | * | |
825 | * Power off a device under the assumption that its pm_domain field points to | |
826 | * the domain member of an object of type struct generic_pm_domain representing | |
827 | * a PM domain consisting of I/O devices. | |
828 | */ | |
829 | static int pm_genpd_dev_poweroff(struct device *dev) | |
830 | { | |
831 | struct generic_pm_domain *genpd; | |
832 | ||
833 | dev_dbg(dev, "%s()\n", __func__); | |
834 | ||
835 | genpd = dev_to_genpd(dev); | |
836 | if (IS_ERR(genpd)) | |
837 | return -EINVAL; | |
838 | ||
839 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
840 | } | |
841 | ||
842 | /** | |
843 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
844 | * @dev: Device to suspend. | |
845 | * | |
846 | * Carry out a late powering off of a device under the assumption that its | |
847 | * pm_domain field points to the domain member of an object of type | |
848 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
849 | */ | |
850 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
851 | { | |
852 | struct generic_pm_domain *genpd; | |
853 | int ret; | |
854 | ||
855 | dev_dbg(dev, "%s()\n", __func__); | |
856 | ||
857 | genpd = dev_to_genpd(dev); | |
858 | if (IS_ERR(genpd)) | |
859 | return -EINVAL; | |
860 | ||
861 | if (genpd->suspend_power_off) | |
862 | return 0; | |
863 | ||
864 | ret = pm_generic_poweroff_noirq(dev); | |
865 | if (ret) | |
866 | return ret; | |
867 | ||
d4f2d87a RW |
868 | if (device_may_wakeup(dev) |
869 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
870 | return 0; | |
871 | ||
596ba34b RW |
872 | if (genpd->stop_device) |
873 | genpd->stop_device(dev); | |
874 | ||
875 | /* | |
876 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
877 | * guaranteed that this function will never run twice in parallel for | |
878 | * the same PM domain, so it is not necessary to use locking here. | |
879 | */ | |
880 | genpd->suspended_count++; | |
881 | pm_genpd_sync_poweroff(genpd); | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | /** | |
887 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
888 | * @dev: Device to resume. | |
889 | * | |
890 | * Carry out an early restore of a device under the assumption that its | |
891 | * pm_domain field points to the domain member of an object of type | |
892 | * struct generic_pm_domain representing a power domain consisting of I/O | |
893 | * devices. | |
894 | */ | |
895 | static int pm_genpd_restore_noirq(struct device *dev) | |
896 | { | |
897 | struct generic_pm_domain *genpd; | |
898 | ||
899 | dev_dbg(dev, "%s()\n", __func__); | |
900 | ||
901 | genpd = dev_to_genpd(dev); | |
902 | if (IS_ERR(genpd)) | |
903 | return -EINVAL; | |
904 | ||
905 | /* | |
906 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
907 | * guaranteed that this function will never run twice in parallel for | |
908 | * the same PM domain, so it is not necessary to use locking here. | |
909 | */ | |
17b75eca | 910 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
911 | if (genpd->suspend_power_off) { |
912 | /* | |
913 | * The boot kernel might put the domain into the power on state, | |
914 | * so make sure it really is powered off. | |
915 | */ | |
916 | if (genpd->power_off) | |
917 | genpd->power_off(genpd); | |
918 | return 0; | |
919 | } | |
920 | ||
921 | pm_genpd_poweron(genpd); | |
922 | genpd->suspended_count--; | |
923 | if (genpd->start_device) | |
924 | genpd->start_device(dev); | |
925 | ||
926 | return pm_generic_restore_noirq(dev); | |
927 | } | |
928 | ||
929 | /** | |
930 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
931 | * @dev: Device to resume. | |
932 | * | |
933 | * Restore a device under the assumption that its pm_domain field points to the | |
934 | * domain member of an object of type struct generic_pm_domain representing | |
935 | * a power domain consisting of I/O devices. | |
936 | */ | |
937 | static int pm_genpd_restore(struct device *dev) | |
938 | { | |
939 | struct generic_pm_domain *genpd; | |
940 | ||
941 | dev_dbg(dev, "%s()\n", __func__); | |
942 | ||
943 | genpd = dev_to_genpd(dev); | |
944 | if (IS_ERR(genpd)) | |
945 | return -EINVAL; | |
946 | ||
947 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
948 | } | |
949 | ||
950 | /** | |
951 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
952 | * @dev: Device to complete the transition of. | |
953 | * | |
954 | * Complete a power transition of a device (during a system-wide power | |
955 | * transition) under the assumption that its pm_domain field points to the | |
956 | * domain member of an object of type struct generic_pm_domain representing | |
957 | * a power domain consisting of I/O devices. | |
958 | */ | |
959 | static void pm_genpd_complete(struct device *dev) | |
960 | { | |
961 | struct generic_pm_domain *genpd; | |
962 | bool run_complete; | |
963 | ||
964 | dev_dbg(dev, "%s()\n", __func__); | |
965 | ||
966 | genpd = dev_to_genpd(dev); | |
967 | if (IS_ERR(genpd)) | |
968 | return; | |
969 | ||
970 | mutex_lock(&genpd->lock); | |
971 | ||
972 | run_complete = !genpd->suspend_power_off; | |
973 | if (--genpd->prepared_count == 0) | |
974 | genpd->suspend_power_off = false; | |
975 | ||
976 | mutex_unlock(&genpd->lock); | |
977 | ||
978 | if (run_complete) { | |
979 | pm_generic_complete(dev); | |
6f00ff78 | 980 | pm_runtime_set_active(dev); |
596ba34b | 981 | pm_runtime_enable(dev); |
6f00ff78 | 982 | pm_runtime_idle(dev); |
596ba34b RW |
983 | } |
984 | } | |
985 | ||
986 | #else | |
987 | ||
988 | #define pm_genpd_prepare NULL | |
989 | #define pm_genpd_suspend NULL | |
990 | #define pm_genpd_suspend_noirq NULL | |
991 | #define pm_genpd_resume_noirq NULL | |
992 | #define pm_genpd_resume NULL | |
993 | #define pm_genpd_freeze NULL | |
994 | #define pm_genpd_freeze_noirq NULL | |
995 | #define pm_genpd_thaw_noirq NULL | |
996 | #define pm_genpd_thaw NULL | |
997 | #define pm_genpd_dev_poweroff_noirq NULL | |
998 | #define pm_genpd_dev_poweroff NULL | |
999 | #define pm_genpd_restore_noirq NULL | |
1000 | #define pm_genpd_restore NULL | |
1001 | #define pm_genpd_complete NULL | |
1002 | ||
1003 | #endif /* CONFIG_PM_SLEEP */ | |
1004 | ||
f721889f RW |
1005 | /** |
1006 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
1007 | * @genpd: PM domain to add the device to. | |
1008 | * @dev: Device to be added. | |
1009 | */ | |
1010 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
1011 | { | |
1012 | struct dev_list_entry *dle; | |
1013 | int ret = 0; | |
1014 | ||
1015 | dev_dbg(dev, "%s()\n", __func__); | |
1016 | ||
1017 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1018 | return -EINVAL; | |
1019 | ||
17b75eca | 1020 | genpd_acquire_lock(genpd); |
f721889f | 1021 | |
17b75eca | 1022 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1023 | ret = -EINVAL; |
1024 | goto out; | |
1025 | } | |
1026 | ||
596ba34b RW |
1027 | if (genpd->prepared_count > 0) { |
1028 | ret = -EAGAIN; | |
1029 | goto out; | |
1030 | } | |
1031 | ||
f721889f RW |
1032 | list_for_each_entry(dle, &genpd->dev_list, node) |
1033 | if (dle->dev == dev) { | |
1034 | ret = -EINVAL; | |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); | |
1039 | if (!dle) { | |
1040 | ret = -ENOMEM; | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | dle->dev = dev; | |
1045 | dle->need_restore = false; | |
1046 | list_add_tail(&dle->node, &genpd->dev_list); | |
596ba34b | 1047 | genpd->device_count++; |
f721889f RW |
1048 | |
1049 | spin_lock_irq(&dev->power.lock); | |
1050 | dev->pm_domain = &genpd->domain; | |
1051 | spin_unlock_irq(&dev->power.lock); | |
1052 | ||
1053 | out: | |
17b75eca | 1054 | genpd_release_lock(genpd); |
f721889f RW |
1055 | |
1056 | return ret; | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1061 | * @genpd: PM domain to remove the device from. | |
1062 | * @dev: Device to be removed. | |
1063 | */ | |
1064 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1065 | struct device *dev) | |
1066 | { | |
1067 | struct dev_list_entry *dle; | |
1068 | int ret = -EINVAL; | |
1069 | ||
1070 | dev_dbg(dev, "%s()\n", __func__); | |
1071 | ||
1072 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1073 | return -EINVAL; | |
1074 | ||
17b75eca | 1075 | genpd_acquire_lock(genpd); |
f721889f | 1076 | |
596ba34b RW |
1077 | if (genpd->prepared_count > 0) { |
1078 | ret = -EAGAIN; | |
1079 | goto out; | |
1080 | } | |
1081 | ||
f721889f RW |
1082 | list_for_each_entry(dle, &genpd->dev_list, node) { |
1083 | if (dle->dev != dev) | |
1084 | continue; | |
1085 | ||
1086 | spin_lock_irq(&dev->power.lock); | |
1087 | dev->pm_domain = NULL; | |
1088 | spin_unlock_irq(&dev->power.lock); | |
1089 | ||
596ba34b | 1090 | genpd->device_count--; |
f721889f RW |
1091 | list_del(&dle->node); |
1092 | kfree(dle); | |
1093 | ||
1094 | ret = 0; | |
1095 | break; | |
1096 | } | |
1097 | ||
596ba34b | 1098 | out: |
17b75eca | 1099 | genpd_release_lock(genpd); |
f721889f RW |
1100 | |
1101 | return ret; | |
1102 | } | |
1103 | ||
1104 | /** | |
1105 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1106 | * @genpd: Master PM domain to add the subdomain to. | |
1107 | * @new_subdomain: Subdomain to be added. | |
1108 | */ | |
1109 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1110 | struct generic_pm_domain *new_subdomain) | |
1111 | { | |
1112 | struct generic_pm_domain *subdomain; | |
1113 | int ret = 0; | |
1114 | ||
1115 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) | |
1116 | return -EINVAL; | |
1117 | ||
17b75eca RW |
1118 | start: |
1119 | genpd_acquire_lock(genpd); | |
1120 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1121 | |
17b75eca RW |
1122 | if (new_subdomain->status != GPD_STATE_POWER_OFF |
1123 | && new_subdomain->status != GPD_STATE_ACTIVE) { | |
1124 | mutex_unlock(&new_subdomain->lock); | |
1125 | genpd_release_lock(genpd); | |
1126 | goto start; | |
1127 | } | |
1128 | ||
1129 | if (genpd->status == GPD_STATE_POWER_OFF | |
1130 | && new_subdomain->status != GPD_STATE_POWER_OFF) { | |
f721889f RW |
1131 | ret = -EINVAL; |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1136 | if (subdomain == new_subdomain) { | |
1137 | ret = -EINVAL; | |
1138 | goto out; | |
1139 | } | |
1140 | } | |
1141 | ||
f721889f RW |
1142 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
1143 | new_subdomain->parent = genpd; | |
17b75eca | 1144 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1145 | genpd->sd_count++; |
1146 | ||
f721889f | 1147 | out: |
17b75eca RW |
1148 | mutex_unlock(&new_subdomain->lock); |
1149 | genpd_release_lock(genpd); | |
f721889f RW |
1150 | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1156 | * @genpd: Master PM domain to remove the subdomain from. | |
1157 | * @target: Subdomain to be removed. | |
1158 | */ | |
1159 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
1160 | struct generic_pm_domain *target) | |
1161 | { | |
1162 | struct generic_pm_domain *subdomain; | |
1163 | int ret = -EINVAL; | |
1164 | ||
1165 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) | |
1166 | return -EINVAL; | |
1167 | ||
17b75eca RW |
1168 | start: |
1169 | genpd_acquire_lock(genpd); | |
f721889f RW |
1170 | |
1171 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1172 | if (subdomain != target) | |
1173 | continue; | |
1174 | ||
1175 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1176 | ||
17b75eca RW |
1177 | if (subdomain->status != GPD_STATE_POWER_OFF |
1178 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1179 | mutex_unlock(&subdomain->lock); | |
1180 | genpd_release_lock(genpd); | |
1181 | goto start; | |
1182 | } | |
1183 | ||
f721889f RW |
1184 | list_del(&subdomain->sd_node); |
1185 | subdomain->parent = NULL; | |
17b75eca | 1186 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1187 | genpd_sd_counter_dec(genpd); |
1188 | ||
1189 | mutex_unlock(&subdomain->lock); | |
1190 | ||
1191 | ret = 0; | |
1192 | break; | |
1193 | } | |
1194 | ||
17b75eca | 1195 | genpd_release_lock(genpd); |
f721889f RW |
1196 | |
1197 | return ret; | |
1198 | } | |
1199 | ||
1200 | /** | |
1201 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1202 | * @genpd: PM domain object to initialize. | |
1203 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1204 | * @is_off: Initial value of the domain's power_is_off field. | |
1205 | */ | |
1206 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1207 | struct dev_power_governor *gov, bool is_off) | |
1208 | { | |
1209 | if (IS_ERR_OR_NULL(genpd)) | |
1210 | return; | |
1211 | ||
1212 | INIT_LIST_HEAD(&genpd->sd_node); | |
1213 | genpd->parent = NULL; | |
1214 | INIT_LIST_HEAD(&genpd->dev_list); | |
1215 | INIT_LIST_HEAD(&genpd->sd_list); | |
1216 | mutex_init(&genpd->lock); | |
1217 | genpd->gov = gov; | |
1218 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1219 | genpd->in_progress = 0; | |
1220 | genpd->sd_count = 0; | |
17b75eca RW |
1221 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1222 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1223 | genpd->poweroff_task = NULL; |
1224 | genpd->resume_count = 0; | |
596ba34b RW |
1225 | genpd->device_count = 0; |
1226 | genpd->suspended_count = 0; | |
f721889f RW |
1227 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1228 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1229 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1230 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1231 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1232 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1233 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1234 | genpd->domain.ops.resume = pm_genpd_resume; | |
1235 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1236 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1237 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1238 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1239 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1240 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1241 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1242 | genpd->domain.ops.restore = pm_genpd_restore; | |
1243 | genpd->domain.ops.complete = pm_genpd_complete; | |
f721889f | 1244 | } |