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 | |
5125bbf3 RW |
19 | static LIST_HEAD(gpd_list); |
20 | static DEFINE_MUTEX(gpd_list_lock); | |
21 | ||
5248051b RW |
22 | #ifdef CONFIG_PM |
23 | ||
24 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
25 | { | |
26 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
27 | return ERR_PTR(-EINVAL); | |
28 | ||
596ba34b | 29 | return pd_to_genpd(dev->pm_domain); |
5248051b | 30 | } |
f721889f RW |
31 | |
32 | static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) | |
33 | { | |
34 | if (!WARN_ON(genpd->sd_count == 0)) | |
35 | genpd->sd_count--; | |
36 | } | |
37 | ||
17b75eca RW |
38 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
39 | { | |
40 | DEFINE_WAIT(wait); | |
41 | ||
42 | mutex_lock(&genpd->lock); | |
43 | /* | |
44 | * Wait for the domain to transition into either the active, | |
45 | * or the power off state. | |
46 | */ | |
47 | for (;;) { | |
48 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
49 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
50 | if (genpd->status == GPD_STATE_ACTIVE |
51 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
52 | break; |
53 | mutex_unlock(&genpd->lock); | |
54 | ||
55 | schedule(); | |
56 | ||
57 | mutex_lock(&genpd->lock); | |
58 | } | |
59 | finish_wait(&genpd->status_wait_queue, &wait); | |
60 | } | |
61 | ||
62 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
63 | { | |
64 | mutex_unlock(&genpd->lock); | |
65 | } | |
66 | ||
c6d22b37 RW |
67 | static void genpd_set_active(struct generic_pm_domain *genpd) |
68 | { | |
69 | if (genpd->resume_count == 0) | |
70 | genpd->status = GPD_STATE_ACTIVE; | |
71 | } | |
72 | ||
5248051b RW |
73 | /** |
74 | * pm_genpd_poweron - Restore power to a given PM domain and its parents. | |
75 | * @genpd: PM domain to power up. | |
76 | * | |
77 | * Restore power to @genpd and all of its parents so that it is possible to | |
78 | * resume a device belonging to it. | |
79 | */ | |
18b4f3f5 | 80 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 81 | { |
17b75eca | 82 | struct generic_pm_domain *parent = genpd->parent; |
5248051b RW |
83 | int ret = 0; |
84 | ||
85 | start: | |
17b75eca | 86 | if (parent) { |
c6d22b37 | 87 | genpd_acquire_lock(parent); |
17b75eca RW |
88 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
89 | } else { | |
90 | mutex_lock(&genpd->lock); | |
91 | } | |
17b75eca RW |
92 | |
93 | if (genpd->status == GPD_STATE_ACTIVE | |
596ba34b | 94 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
5248051b RW |
95 | goto out; |
96 | ||
c6d22b37 RW |
97 | if (genpd->status != GPD_STATE_POWER_OFF) { |
98 | genpd_set_active(genpd); | |
99 | goto out; | |
100 | } | |
101 | ||
17b75eca | 102 | if (parent && parent->status != GPD_STATE_ACTIVE) { |
5248051b | 103 | mutex_unlock(&genpd->lock); |
c6d22b37 | 104 | genpd_release_lock(parent); |
5248051b | 105 | |
17b75eca | 106 | ret = pm_genpd_poweron(parent); |
5248051b RW |
107 | if (ret) |
108 | return ret; | |
109 | ||
110 | goto start; | |
111 | } | |
112 | ||
113 | if (genpd->power_on) { | |
fe202fde | 114 | ret = genpd->power_on(genpd); |
5248051b RW |
115 | if (ret) |
116 | goto out; | |
117 | } | |
118 | ||
c6d22b37 | 119 | genpd_set_active(genpd); |
17b75eca RW |
120 | if (parent) |
121 | parent->sd_count++; | |
5248051b RW |
122 | |
123 | out: | |
124 | mutex_unlock(&genpd->lock); | |
17b75eca | 125 | if (parent) |
c6d22b37 | 126 | genpd_release_lock(parent); |
5248051b RW |
127 | |
128 | return ret; | |
129 | } | |
130 | ||
131 | #endif /* CONFIG_PM */ | |
132 | ||
133 | #ifdef CONFIG_PM_RUNTIME | |
134 | ||
f721889f RW |
135 | /** |
136 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
137 | * @dle: Device list entry of the device to save the state of. | |
138 | * @genpd: PM domain the device belongs to. | |
139 | */ | |
140 | static int __pm_genpd_save_device(struct dev_list_entry *dle, | |
141 | struct generic_pm_domain *genpd) | |
17b75eca | 142 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
143 | { |
144 | struct device *dev = dle->dev; | |
145 | struct device_driver *drv = dev->driver; | |
146 | int ret = 0; | |
147 | ||
148 | if (dle->need_restore) | |
149 | return 0; | |
150 | ||
17b75eca RW |
151 | mutex_unlock(&genpd->lock); |
152 | ||
f721889f RW |
153 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
154 | if (genpd->start_device) | |
155 | genpd->start_device(dev); | |
156 | ||
157 | ret = drv->pm->runtime_suspend(dev); | |
158 | ||
159 | if (genpd->stop_device) | |
160 | genpd->stop_device(dev); | |
161 | } | |
162 | ||
17b75eca RW |
163 | mutex_lock(&genpd->lock); |
164 | ||
f721889f RW |
165 | if (!ret) |
166 | dle->need_restore = true; | |
167 | ||
168 | return ret; | |
169 | } | |
170 | ||
171 | /** | |
172 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
173 | * @dle: Device list entry of the device to restore the state of. | |
174 | * @genpd: PM domain the device belongs to. | |
175 | */ | |
176 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, | |
177 | struct generic_pm_domain *genpd) | |
17b75eca | 178 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
179 | { |
180 | struct device *dev = dle->dev; | |
181 | struct device_driver *drv = dev->driver; | |
182 | ||
183 | if (!dle->need_restore) | |
184 | return; | |
185 | ||
17b75eca RW |
186 | mutex_unlock(&genpd->lock); |
187 | ||
f721889f RW |
188 | if (drv && drv->pm && drv->pm->runtime_resume) { |
189 | if (genpd->start_device) | |
190 | genpd->start_device(dev); | |
191 | ||
192 | drv->pm->runtime_resume(dev); | |
193 | ||
194 | if (genpd->stop_device) | |
195 | genpd->stop_device(dev); | |
196 | } | |
197 | ||
17b75eca RW |
198 | mutex_lock(&genpd->lock); |
199 | ||
f721889f RW |
200 | dle->need_restore = false; |
201 | } | |
202 | ||
c6d22b37 RW |
203 | /** |
204 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
205 | * @genpd: PM domain to check. | |
206 | * | |
207 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
208 | * a "power off" operation, which means that a "power on" has occured in the | |
209 | * meantime, or if its resume_count field is different from zero, which means | |
210 | * that one of its devices has been resumed in the meantime. | |
211 | */ | |
212 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
213 | { | |
214 | return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; | |
215 | } | |
216 | ||
56375fd4 RW |
217 | /** |
218 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
219 | * @genpd: PM domait to power off. | |
220 | * | |
221 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
222 | * before. | |
223 | */ | |
0bc5b2de | 224 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
225 | { |
226 | if (!work_pending(&genpd->power_off_work)) | |
227 | queue_work(pm_wq, &genpd->power_off_work); | |
228 | } | |
229 | ||
f721889f RW |
230 | /** |
231 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
232 | * @genpd: PM domain to power down. | |
233 | * | |
234 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
235 | * have been powered down, run the runtime suspend callbacks provided by all of | |
236 | * the @genpd's devices' drivers and remove power from @genpd. | |
237 | */ | |
238 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 239 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
240 | { |
241 | struct generic_pm_domain *parent; | |
242 | struct dev_list_entry *dle; | |
243 | unsigned int not_suspended; | |
c6d22b37 | 244 | int ret = 0; |
f721889f | 245 | |
c6d22b37 RW |
246 | start: |
247 | /* | |
248 | * Do not try to power off the domain in the following situations: | |
249 | * (1) The domain is already in the "power off" state. | |
250 | * (2) System suspend is in progress. | |
251 | * (3) One of the domain's devices is being resumed right now. | |
252 | */ | |
253 | if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 | |
254 | || genpd->resume_count > 0) | |
f721889f RW |
255 | return 0; |
256 | ||
257 | if (genpd->sd_count > 0) | |
258 | return -EBUSY; | |
259 | ||
260 | not_suspended = 0; | |
261 | list_for_each_entry(dle, &genpd->dev_list, node) | |
262 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) | |
263 | not_suspended++; | |
264 | ||
265 | if (not_suspended > genpd->in_progress) | |
266 | return -EBUSY; | |
267 | ||
c6d22b37 RW |
268 | if (genpd->poweroff_task) { |
269 | /* | |
270 | * Another instance of pm_genpd_poweroff() is executing | |
271 | * callbacks, so tell it to start over and return. | |
272 | */ | |
273 | genpd->status = GPD_STATE_REPEAT; | |
274 | return 0; | |
275 | } | |
276 | ||
f721889f RW |
277 | if (genpd->gov && genpd->gov->power_down_ok) { |
278 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
279 | return -EAGAIN; | |
280 | } | |
281 | ||
17b75eca | 282 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 283 | genpd->poweroff_task = current; |
17b75eca | 284 | |
f721889f RW |
285 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
286 | ret = __pm_genpd_save_device(dle, genpd); | |
697a7f37 RW |
287 | if (ret) { |
288 | genpd_set_active(genpd); | |
289 | goto out; | |
290 | } | |
f721889f | 291 | |
c6d22b37 RW |
292 | if (genpd_abort_poweroff(genpd)) |
293 | goto out; | |
294 | ||
295 | if (genpd->status == GPD_STATE_REPEAT) { | |
296 | genpd->poweroff_task = NULL; | |
297 | goto start; | |
298 | } | |
299 | } | |
17b75eca RW |
300 | |
301 | parent = genpd->parent; | |
302 | if (parent) { | |
c6d22b37 RW |
303 | mutex_unlock(&genpd->lock); |
304 | ||
17b75eca RW |
305 | genpd_acquire_lock(parent); |
306 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
c6d22b37 RW |
307 | |
308 | if (genpd_abort_poweroff(genpd)) { | |
309 | genpd_release_lock(parent); | |
310 | goto out; | |
311 | } | |
17b75eca RW |
312 | } |
313 | ||
d2805402 RW |
314 | if (genpd->power_off) { |
315 | ret = genpd->power_off(genpd); | |
316 | if (ret == -EBUSY) { | |
317 | genpd_set_active(genpd); | |
318 | if (parent) | |
319 | genpd_release_lock(parent); | |
320 | ||
321 | goto out; | |
322 | } | |
323 | } | |
f721889f | 324 | |
17b75eca | 325 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 326 | |
f721889f RW |
327 | if (parent) { |
328 | genpd_sd_counter_dec(parent); | |
329 | if (parent->sd_count == 0) | |
56375fd4 | 330 | genpd_queue_power_off_work(parent); |
17b75eca RW |
331 | |
332 | genpd_release_lock(parent); | |
f721889f RW |
333 | } |
334 | ||
c6d22b37 RW |
335 | out: |
336 | genpd->poweroff_task = NULL; | |
337 | wake_up_all(&genpd->status_wait_queue); | |
338 | return ret; | |
f721889f RW |
339 | } |
340 | ||
341 | /** | |
342 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
343 | * @work: Work structure used for scheduling the execution of this function. | |
344 | */ | |
345 | static void genpd_power_off_work_fn(struct work_struct *work) | |
346 | { | |
347 | struct generic_pm_domain *genpd; | |
348 | ||
349 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
350 | ||
17b75eca | 351 | genpd_acquire_lock(genpd); |
f721889f | 352 | pm_genpd_poweroff(genpd); |
17b75eca | 353 | genpd_release_lock(genpd); |
f721889f RW |
354 | } |
355 | ||
356 | /** | |
357 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
358 | * @dev: Device to suspend. | |
359 | * | |
360 | * Carry out a runtime suspend of a device under the assumption that its | |
361 | * pm_domain field points to the domain member of an object of type | |
362 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
363 | */ | |
364 | static int pm_genpd_runtime_suspend(struct device *dev) | |
365 | { | |
366 | struct generic_pm_domain *genpd; | |
367 | ||
368 | dev_dbg(dev, "%s()\n", __func__); | |
369 | ||
5248051b RW |
370 | genpd = dev_to_genpd(dev); |
371 | if (IS_ERR(genpd)) | |
f721889f RW |
372 | return -EINVAL; |
373 | ||
f721889f RW |
374 | if (genpd->stop_device) { |
375 | int ret = genpd->stop_device(dev); | |
376 | if (ret) | |
17b75eca | 377 | return ret; |
f721889f | 378 | } |
17b75eca | 379 | |
c6d22b37 | 380 | mutex_lock(&genpd->lock); |
f721889f RW |
381 | genpd->in_progress++; |
382 | pm_genpd_poweroff(genpd); | |
383 | genpd->in_progress--; | |
c6d22b37 | 384 | mutex_unlock(&genpd->lock); |
f721889f RW |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
596ba34b RW |
389 | /** |
390 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
391 | * @dev: Device to resume. | |
392 | * @genpd: PM domain the device belongs to. | |
393 | */ | |
394 | static void __pm_genpd_runtime_resume(struct device *dev, | |
395 | struct generic_pm_domain *genpd) | |
396 | { | |
397 | struct dev_list_entry *dle; | |
398 | ||
399 | list_for_each_entry(dle, &genpd->dev_list, node) { | |
400 | if (dle->dev == dev) { | |
401 | __pm_genpd_restore_device(dle, genpd); | |
402 | break; | |
403 | } | |
404 | } | |
596ba34b RW |
405 | } |
406 | ||
f721889f RW |
407 | /** |
408 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
409 | * @dev: Device to resume. | |
410 | * | |
411 | * Carry out a runtime resume of a device under the assumption that its | |
412 | * pm_domain field points to the domain member of an object of type | |
413 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
414 | */ | |
415 | static int pm_genpd_runtime_resume(struct device *dev) | |
416 | { | |
417 | struct generic_pm_domain *genpd; | |
c6d22b37 | 418 | DEFINE_WAIT(wait); |
f721889f RW |
419 | int ret; |
420 | ||
421 | dev_dbg(dev, "%s()\n", __func__); | |
422 | ||
5248051b RW |
423 | genpd = dev_to_genpd(dev); |
424 | if (IS_ERR(genpd)) | |
f721889f RW |
425 | return -EINVAL; |
426 | ||
f721889f RW |
427 | ret = pm_genpd_poweron(genpd); |
428 | if (ret) | |
429 | return ret; | |
430 | ||
c6d22b37 | 431 | mutex_lock(&genpd->lock); |
17b75eca | 432 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
433 | genpd->resume_count++; |
434 | for (;;) { | |
435 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
436 | TASK_UNINTERRUPTIBLE); | |
437 | /* | |
438 | * If current is the powering off task, we have been called | |
439 | * reentrantly from one of the device callbacks, so we should | |
440 | * not wait. | |
441 | */ | |
442 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
443 | break; | |
444 | mutex_unlock(&genpd->lock); | |
445 | ||
446 | schedule(); | |
447 | ||
448 | mutex_lock(&genpd->lock); | |
449 | } | |
450 | finish_wait(&genpd->status_wait_queue, &wait); | |
596ba34b | 451 | __pm_genpd_runtime_resume(dev, genpd); |
c6d22b37 RW |
452 | genpd->resume_count--; |
453 | genpd_set_active(genpd); | |
17b75eca | 454 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 455 | mutex_unlock(&genpd->lock); |
17b75eca RW |
456 | |
457 | if (genpd->start_device) | |
458 | genpd->start_device(dev); | |
f721889f RW |
459 | |
460 | return 0; | |
461 | } | |
462 | ||
463 | #else | |
464 | ||
465 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
596ba34b RW |
466 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
467 | struct generic_pm_domain *genpd) {} | |
f721889f RW |
468 | |
469 | #define pm_genpd_runtime_suspend NULL | |
470 | #define pm_genpd_runtime_resume NULL | |
471 | ||
472 | #endif /* CONFIG_PM_RUNTIME */ | |
473 | ||
596ba34b RW |
474 | #ifdef CONFIG_PM_SLEEP |
475 | ||
476 | /** | |
477 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. | |
478 | * @genpd: PM domain to power off, if possible. | |
479 | * | |
480 | * Check if the given PM domain can be powered off (during system suspend or | |
481 | * hibernation) and do that if so. Also, in that case propagate to its parent. | |
482 | * | |
483 | * This function is only called in "noirq" stages of system power transitions, | |
484 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
485 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
486 | */ | |
487 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
488 | { | |
489 | struct generic_pm_domain *parent = genpd->parent; | |
490 | ||
17b75eca | 491 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
492 | return; |
493 | ||
494 | if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) | |
495 | return; | |
496 | ||
497 | if (genpd->power_off) | |
498 | genpd->power_off(genpd); | |
499 | ||
17b75eca | 500 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
501 | if (parent) { |
502 | genpd_sd_counter_dec(parent); | |
503 | pm_genpd_sync_poweroff(parent); | |
504 | } | |
505 | } | |
506 | ||
4ecd6e65 RW |
507 | /** |
508 | * resume_needed - Check whether to resume a device before system suspend. | |
509 | * @dev: Device to check. | |
510 | * @genpd: PM domain the device belongs to. | |
511 | * | |
512 | * There are two cases in which a device that can wake up the system from sleep | |
513 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
514 | * to wake up the system and it has to remain active for this purpose while the | |
515 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
516 | * the system from sleep states and it generally doesn't generate wakeup signals | |
517 | * by itself (those signals are generated on its behalf by other parts of the | |
518 | * system). In the latter case it may be necessary to reconfigure the device's | |
519 | * wakeup settings during system suspend, because it may have been set up to | |
520 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
521 | * Return 'true' in either of the above cases. | |
522 | */ | |
523 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
524 | { | |
525 | bool active_wakeup; | |
526 | ||
527 | if (!device_can_wakeup(dev)) | |
528 | return false; | |
529 | ||
530 | active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); | |
531 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; | |
532 | } | |
533 | ||
596ba34b RW |
534 | /** |
535 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
536 | * @dev: Device to start the transition of. | |
537 | * | |
538 | * Start a power transition of a device (during a system-wide power transition) | |
539 | * under the assumption that its pm_domain field points to the domain member of | |
540 | * an object of type struct generic_pm_domain representing a PM domain | |
541 | * consisting of I/O devices. | |
542 | */ | |
543 | static int pm_genpd_prepare(struct device *dev) | |
544 | { | |
545 | struct generic_pm_domain *genpd; | |
b6c10c84 | 546 | int ret; |
596ba34b RW |
547 | |
548 | dev_dbg(dev, "%s()\n", __func__); | |
549 | ||
550 | genpd = dev_to_genpd(dev); | |
551 | if (IS_ERR(genpd)) | |
552 | return -EINVAL; | |
553 | ||
17b75eca RW |
554 | /* |
555 | * If a wakeup request is pending for the device, it should be woken up | |
556 | * at this point and a system wakeup event should be reported if it's | |
557 | * set up to wake up the system from sleep states. | |
558 | */ | |
559 | pm_runtime_get_noresume(dev); | |
560 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
561 | pm_wakeup_event(dev, 0); | |
562 | ||
563 | if (pm_wakeup_pending()) { | |
564 | pm_runtime_put_sync(dev); | |
565 | return -EBUSY; | |
566 | } | |
567 | ||
4ecd6e65 RW |
568 | if (resume_needed(dev, genpd)) |
569 | pm_runtime_resume(dev); | |
570 | ||
17b75eca | 571 | genpd_acquire_lock(genpd); |
596ba34b RW |
572 | |
573 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
574 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
575 | ||
576 | genpd_release_lock(genpd); | |
596ba34b RW |
577 | |
578 | if (genpd->suspend_power_off) { | |
17b75eca | 579 | pm_runtime_put_noidle(dev); |
596ba34b RW |
580 | return 0; |
581 | } | |
582 | ||
583 | /* | |
17b75eca RW |
584 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
585 | * so pm_genpd_poweron() will return immediately, but if the device | |
586 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
587 | * to make it operational. | |
596ba34b | 588 | */ |
17b75eca | 589 | pm_runtime_resume(dev); |
596ba34b RW |
590 | __pm_runtime_disable(dev, false); |
591 | ||
b6c10c84 RW |
592 | ret = pm_generic_prepare(dev); |
593 | if (ret) { | |
594 | mutex_lock(&genpd->lock); | |
595 | ||
596 | if (--genpd->prepared_count == 0) | |
597 | genpd->suspend_power_off = false; | |
598 | ||
599 | mutex_unlock(&genpd->lock); | |
17b75eca | 600 | pm_runtime_enable(dev); |
b6c10c84 | 601 | } |
17b75eca RW |
602 | |
603 | pm_runtime_put_sync(dev); | |
b6c10c84 | 604 | return ret; |
596ba34b RW |
605 | } |
606 | ||
607 | /** | |
608 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
609 | * @dev: Device to suspend. | |
610 | * | |
611 | * Suspend a device under the assumption that its pm_domain field points to the | |
612 | * domain member of an object of type struct generic_pm_domain representing | |
613 | * a PM domain consisting of I/O devices. | |
614 | */ | |
615 | static int pm_genpd_suspend(struct device *dev) | |
616 | { | |
617 | struct generic_pm_domain *genpd; | |
618 | ||
619 | dev_dbg(dev, "%s()\n", __func__); | |
620 | ||
621 | genpd = dev_to_genpd(dev); | |
622 | if (IS_ERR(genpd)) | |
623 | return -EINVAL; | |
624 | ||
625 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
626 | } | |
627 | ||
628 | /** | |
629 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
630 | * @dev: Device to suspend. | |
631 | * | |
632 | * Carry out a late suspend of a device under the assumption that its | |
633 | * pm_domain field points to the domain member of an object of type | |
634 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
635 | */ | |
636 | static int pm_genpd_suspend_noirq(struct device *dev) | |
637 | { | |
638 | struct generic_pm_domain *genpd; | |
639 | int ret; | |
640 | ||
641 | dev_dbg(dev, "%s()\n", __func__); | |
642 | ||
643 | genpd = dev_to_genpd(dev); | |
644 | if (IS_ERR(genpd)) | |
645 | return -EINVAL; | |
646 | ||
647 | if (genpd->suspend_power_off) | |
648 | return 0; | |
649 | ||
650 | ret = pm_generic_suspend_noirq(dev); | |
651 | if (ret) | |
652 | return ret; | |
653 | ||
d4f2d87a RW |
654 | if (device_may_wakeup(dev) |
655 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
656 | return 0; | |
657 | ||
596ba34b RW |
658 | if (genpd->stop_device) |
659 | genpd->stop_device(dev); | |
660 | ||
661 | /* | |
662 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
663 | * guaranteed that this function will never run twice in parallel for | |
664 | * the same PM domain, so it is not necessary to use locking here. | |
665 | */ | |
666 | genpd->suspended_count++; | |
667 | pm_genpd_sync_poweroff(genpd); | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
672 | /** | |
673 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
674 | * @dev: Device to resume. | |
675 | * | |
676 | * Carry out an early resume of a device under the assumption that its | |
677 | * pm_domain field points to the domain member of an object of type | |
678 | * struct generic_pm_domain representing a power domain consisting of I/O | |
679 | * devices. | |
680 | */ | |
681 | static int pm_genpd_resume_noirq(struct device *dev) | |
682 | { | |
683 | struct generic_pm_domain *genpd; | |
684 | ||
685 | dev_dbg(dev, "%s()\n", __func__); | |
686 | ||
687 | genpd = dev_to_genpd(dev); | |
688 | if (IS_ERR(genpd)) | |
689 | return -EINVAL; | |
690 | ||
691 | if (genpd->suspend_power_off) | |
692 | return 0; | |
693 | ||
694 | /* | |
695 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
696 | * guaranteed that this function will never run twice in parallel for | |
697 | * the same PM domain, so it is not necessary to use locking here. | |
698 | */ | |
699 | pm_genpd_poweron(genpd); | |
700 | genpd->suspended_count--; | |
701 | if (genpd->start_device) | |
702 | genpd->start_device(dev); | |
703 | ||
704 | return pm_generic_resume_noirq(dev); | |
705 | } | |
706 | ||
707 | /** | |
708 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
709 | * @dev: Device to resume. | |
710 | * | |
711 | * Resume a device under the assumption that its pm_domain field points to the | |
712 | * domain member of an object of type struct generic_pm_domain representing | |
713 | * a power domain consisting of I/O devices. | |
714 | */ | |
715 | static int pm_genpd_resume(struct device *dev) | |
716 | { | |
717 | struct generic_pm_domain *genpd; | |
718 | ||
719 | dev_dbg(dev, "%s()\n", __func__); | |
720 | ||
721 | genpd = dev_to_genpd(dev); | |
722 | if (IS_ERR(genpd)) | |
723 | return -EINVAL; | |
724 | ||
725 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
726 | } | |
727 | ||
728 | /** | |
729 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
730 | * @dev: Device to freeze. | |
731 | * | |
732 | * Freeze a device under the assumption that its pm_domain field points to the | |
733 | * domain member of an object of type struct generic_pm_domain representing | |
734 | * a power domain consisting of I/O devices. | |
735 | */ | |
736 | static int pm_genpd_freeze(struct device *dev) | |
737 | { | |
738 | struct generic_pm_domain *genpd; | |
739 | ||
740 | dev_dbg(dev, "%s()\n", __func__); | |
741 | ||
742 | genpd = dev_to_genpd(dev); | |
743 | if (IS_ERR(genpd)) | |
744 | return -EINVAL; | |
745 | ||
746 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
747 | } | |
748 | ||
749 | /** | |
750 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
751 | * @dev: Device to freeze. | |
752 | * | |
753 | * Carry out a late freeze of a device under the assumption that its | |
754 | * pm_domain field points to the domain member of an object of type | |
755 | * struct generic_pm_domain representing a power domain consisting of I/O | |
756 | * devices. | |
757 | */ | |
758 | static int pm_genpd_freeze_noirq(struct device *dev) | |
759 | { | |
760 | struct generic_pm_domain *genpd; | |
761 | int ret; | |
762 | ||
763 | dev_dbg(dev, "%s()\n", __func__); | |
764 | ||
765 | genpd = dev_to_genpd(dev); | |
766 | if (IS_ERR(genpd)) | |
767 | return -EINVAL; | |
768 | ||
769 | if (genpd->suspend_power_off) | |
770 | return 0; | |
771 | ||
772 | ret = pm_generic_freeze_noirq(dev); | |
773 | if (ret) | |
774 | return ret; | |
775 | ||
776 | if (genpd->stop_device) | |
777 | genpd->stop_device(dev); | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | /** | |
783 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
784 | * @dev: Device to thaw. | |
785 | * | |
786 | * Carry out an early thaw of a device under the assumption that its | |
787 | * pm_domain field points to the domain member of an object of type | |
788 | * struct generic_pm_domain representing a power domain consisting of I/O | |
789 | * devices. | |
790 | */ | |
791 | static int pm_genpd_thaw_noirq(struct device *dev) | |
792 | { | |
793 | struct generic_pm_domain *genpd; | |
794 | ||
795 | dev_dbg(dev, "%s()\n", __func__); | |
796 | ||
797 | genpd = dev_to_genpd(dev); | |
798 | if (IS_ERR(genpd)) | |
799 | return -EINVAL; | |
800 | ||
801 | if (genpd->suspend_power_off) | |
802 | return 0; | |
803 | ||
804 | if (genpd->start_device) | |
805 | genpd->start_device(dev); | |
806 | ||
807 | return pm_generic_thaw_noirq(dev); | |
808 | } | |
809 | ||
810 | /** | |
811 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
812 | * @dev: Device to thaw. | |
813 | * | |
814 | * Thaw a device under the assumption that its pm_domain field points to the | |
815 | * domain member of an object of type struct generic_pm_domain representing | |
816 | * a power domain consisting of I/O devices. | |
817 | */ | |
818 | static int pm_genpd_thaw(struct device *dev) | |
819 | { | |
820 | struct generic_pm_domain *genpd; | |
821 | ||
822 | dev_dbg(dev, "%s()\n", __func__); | |
823 | ||
824 | genpd = dev_to_genpd(dev); | |
825 | if (IS_ERR(genpd)) | |
826 | return -EINVAL; | |
827 | ||
828 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
829 | } | |
830 | ||
831 | /** | |
832 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
833 | * @dev: Device to suspend. | |
834 | * | |
835 | * Power off a device under the assumption that its pm_domain field points to | |
836 | * the domain member of an object of type struct generic_pm_domain representing | |
837 | * a PM domain consisting of I/O devices. | |
838 | */ | |
839 | static int pm_genpd_dev_poweroff(struct device *dev) | |
840 | { | |
841 | struct generic_pm_domain *genpd; | |
842 | ||
843 | dev_dbg(dev, "%s()\n", __func__); | |
844 | ||
845 | genpd = dev_to_genpd(dev); | |
846 | if (IS_ERR(genpd)) | |
847 | return -EINVAL; | |
848 | ||
849 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
850 | } | |
851 | ||
852 | /** | |
853 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
854 | * @dev: Device to suspend. | |
855 | * | |
856 | * Carry out a late powering off of a device under the assumption that its | |
857 | * pm_domain field points to the domain member of an object of type | |
858 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
859 | */ | |
860 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
861 | { | |
862 | struct generic_pm_domain *genpd; | |
863 | int ret; | |
864 | ||
865 | dev_dbg(dev, "%s()\n", __func__); | |
866 | ||
867 | genpd = dev_to_genpd(dev); | |
868 | if (IS_ERR(genpd)) | |
869 | return -EINVAL; | |
870 | ||
871 | if (genpd->suspend_power_off) | |
872 | return 0; | |
873 | ||
874 | ret = pm_generic_poweroff_noirq(dev); | |
875 | if (ret) | |
876 | return ret; | |
877 | ||
d4f2d87a RW |
878 | if (device_may_wakeup(dev) |
879 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
880 | return 0; | |
881 | ||
596ba34b RW |
882 | if (genpd->stop_device) |
883 | genpd->stop_device(dev); | |
884 | ||
885 | /* | |
886 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
887 | * guaranteed that this function will never run twice in parallel for | |
888 | * the same PM domain, so it is not necessary to use locking here. | |
889 | */ | |
890 | genpd->suspended_count++; | |
891 | pm_genpd_sync_poweroff(genpd); | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | /** | |
897 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
898 | * @dev: Device to resume. | |
899 | * | |
900 | * Carry out an early restore of a device under the assumption that its | |
901 | * pm_domain field points to the domain member of an object of type | |
902 | * struct generic_pm_domain representing a power domain consisting of I/O | |
903 | * devices. | |
904 | */ | |
905 | static int pm_genpd_restore_noirq(struct device *dev) | |
906 | { | |
907 | struct generic_pm_domain *genpd; | |
908 | ||
909 | dev_dbg(dev, "%s()\n", __func__); | |
910 | ||
911 | genpd = dev_to_genpd(dev); | |
912 | if (IS_ERR(genpd)) | |
913 | return -EINVAL; | |
914 | ||
915 | /* | |
916 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
917 | * guaranteed that this function will never run twice in parallel for | |
918 | * the same PM domain, so it is not necessary to use locking here. | |
919 | */ | |
17b75eca | 920 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
921 | if (genpd->suspend_power_off) { |
922 | /* | |
923 | * The boot kernel might put the domain into the power on state, | |
924 | * so make sure it really is powered off. | |
925 | */ | |
926 | if (genpd->power_off) | |
927 | genpd->power_off(genpd); | |
928 | return 0; | |
929 | } | |
930 | ||
931 | pm_genpd_poweron(genpd); | |
932 | genpd->suspended_count--; | |
933 | if (genpd->start_device) | |
934 | genpd->start_device(dev); | |
935 | ||
936 | return pm_generic_restore_noirq(dev); | |
937 | } | |
938 | ||
939 | /** | |
940 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
941 | * @dev: Device to resume. | |
942 | * | |
943 | * Restore a device under the assumption that its pm_domain field points to the | |
944 | * domain member of an object of type struct generic_pm_domain representing | |
945 | * a power domain consisting of I/O devices. | |
946 | */ | |
947 | static int pm_genpd_restore(struct device *dev) | |
948 | { | |
949 | struct generic_pm_domain *genpd; | |
950 | ||
951 | dev_dbg(dev, "%s()\n", __func__); | |
952 | ||
953 | genpd = dev_to_genpd(dev); | |
954 | if (IS_ERR(genpd)) | |
955 | return -EINVAL; | |
956 | ||
957 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
958 | } | |
959 | ||
960 | /** | |
961 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
962 | * @dev: Device to complete the transition of. | |
963 | * | |
964 | * Complete a power transition of a device (during a system-wide power | |
965 | * transition) under the assumption that its pm_domain field points to the | |
966 | * domain member of an object of type struct generic_pm_domain representing | |
967 | * a power domain consisting of I/O devices. | |
968 | */ | |
969 | static void pm_genpd_complete(struct device *dev) | |
970 | { | |
971 | struct generic_pm_domain *genpd; | |
972 | bool run_complete; | |
973 | ||
974 | dev_dbg(dev, "%s()\n", __func__); | |
975 | ||
976 | genpd = dev_to_genpd(dev); | |
977 | if (IS_ERR(genpd)) | |
978 | return; | |
979 | ||
980 | mutex_lock(&genpd->lock); | |
981 | ||
982 | run_complete = !genpd->suspend_power_off; | |
983 | if (--genpd->prepared_count == 0) | |
984 | genpd->suspend_power_off = false; | |
985 | ||
986 | mutex_unlock(&genpd->lock); | |
987 | ||
988 | if (run_complete) { | |
989 | pm_generic_complete(dev); | |
6f00ff78 | 990 | pm_runtime_set_active(dev); |
596ba34b | 991 | pm_runtime_enable(dev); |
6f00ff78 | 992 | pm_runtime_idle(dev); |
596ba34b RW |
993 | } |
994 | } | |
995 | ||
996 | #else | |
997 | ||
998 | #define pm_genpd_prepare NULL | |
999 | #define pm_genpd_suspend NULL | |
1000 | #define pm_genpd_suspend_noirq NULL | |
1001 | #define pm_genpd_resume_noirq NULL | |
1002 | #define pm_genpd_resume NULL | |
1003 | #define pm_genpd_freeze NULL | |
1004 | #define pm_genpd_freeze_noirq NULL | |
1005 | #define pm_genpd_thaw_noirq NULL | |
1006 | #define pm_genpd_thaw NULL | |
1007 | #define pm_genpd_dev_poweroff_noirq NULL | |
1008 | #define pm_genpd_dev_poweroff NULL | |
1009 | #define pm_genpd_restore_noirq NULL | |
1010 | #define pm_genpd_restore NULL | |
1011 | #define pm_genpd_complete NULL | |
1012 | ||
1013 | #endif /* CONFIG_PM_SLEEP */ | |
1014 | ||
f721889f RW |
1015 | /** |
1016 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
1017 | * @genpd: PM domain to add the device to. | |
1018 | * @dev: Device to be added. | |
1019 | */ | |
1020 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
1021 | { | |
1022 | struct dev_list_entry *dle; | |
1023 | int ret = 0; | |
1024 | ||
1025 | dev_dbg(dev, "%s()\n", __func__); | |
1026 | ||
1027 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1028 | return -EINVAL; | |
1029 | ||
17b75eca | 1030 | genpd_acquire_lock(genpd); |
f721889f | 1031 | |
17b75eca | 1032 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1033 | ret = -EINVAL; |
1034 | goto out; | |
1035 | } | |
1036 | ||
596ba34b RW |
1037 | if (genpd->prepared_count > 0) { |
1038 | ret = -EAGAIN; | |
1039 | goto out; | |
1040 | } | |
1041 | ||
f721889f RW |
1042 | list_for_each_entry(dle, &genpd->dev_list, node) |
1043 | if (dle->dev == dev) { | |
1044 | ret = -EINVAL; | |
1045 | goto out; | |
1046 | } | |
1047 | ||
1048 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); | |
1049 | if (!dle) { | |
1050 | ret = -ENOMEM; | |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | dle->dev = dev; | |
1055 | dle->need_restore = false; | |
1056 | list_add_tail(&dle->node, &genpd->dev_list); | |
596ba34b | 1057 | genpd->device_count++; |
f721889f RW |
1058 | |
1059 | spin_lock_irq(&dev->power.lock); | |
1060 | dev->pm_domain = &genpd->domain; | |
1061 | spin_unlock_irq(&dev->power.lock); | |
1062 | ||
1063 | out: | |
17b75eca | 1064 | genpd_release_lock(genpd); |
f721889f RW |
1065 | |
1066 | return ret; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1071 | * @genpd: PM domain to remove the device from. | |
1072 | * @dev: Device to be removed. | |
1073 | */ | |
1074 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1075 | struct device *dev) | |
1076 | { | |
1077 | struct dev_list_entry *dle; | |
1078 | int ret = -EINVAL; | |
1079 | ||
1080 | dev_dbg(dev, "%s()\n", __func__); | |
1081 | ||
1082 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1083 | return -EINVAL; | |
1084 | ||
17b75eca | 1085 | genpd_acquire_lock(genpd); |
f721889f | 1086 | |
596ba34b RW |
1087 | if (genpd->prepared_count > 0) { |
1088 | ret = -EAGAIN; | |
1089 | goto out; | |
1090 | } | |
1091 | ||
f721889f RW |
1092 | list_for_each_entry(dle, &genpd->dev_list, node) { |
1093 | if (dle->dev != dev) | |
1094 | continue; | |
1095 | ||
1096 | spin_lock_irq(&dev->power.lock); | |
1097 | dev->pm_domain = NULL; | |
1098 | spin_unlock_irq(&dev->power.lock); | |
1099 | ||
596ba34b | 1100 | genpd->device_count--; |
f721889f RW |
1101 | list_del(&dle->node); |
1102 | kfree(dle); | |
1103 | ||
1104 | ret = 0; | |
1105 | break; | |
1106 | } | |
1107 | ||
596ba34b | 1108 | out: |
17b75eca | 1109 | genpd_release_lock(genpd); |
f721889f RW |
1110 | |
1111 | return ret; | |
1112 | } | |
1113 | ||
1114 | /** | |
1115 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1116 | * @genpd: Master PM domain to add the subdomain to. | |
1117 | * @new_subdomain: Subdomain to be added. | |
1118 | */ | |
1119 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1120 | struct generic_pm_domain *new_subdomain) | |
1121 | { | |
1122 | struct generic_pm_domain *subdomain; | |
1123 | int ret = 0; | |
1124 | ||
1125 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) | |
1126 | return -EINVAL; | |
1127 | ||
17b75eca RW |
1128 | start: |
1129 | genpd_acquire_lock(genpd); | |
1130 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1131 | |
17b75eca RW |
1132 | if (new_subdomain->status != GPD_STATE_POWER_OFF |
1133 | && new_subdomain->status != GPD_STATE_ACTIVE) { | |
1134 | mutex_unlock(&new_subdomain->lock); | |
1135 | genpd_release_lock(genpd); | |
1136 | goto start; | |
1137 | } | |
1138 | ||
1139 | if (genpd->status == GPD_STATE_POWER_OFF | |
1140 | && new_subdomain->status != GPD_STATE_POWER_OFF) { | |
f721889f RW |
1141 | ret = -EINVAL; |
1142 | goto out; | |
1143 | } | |
1144 | ||
1145 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1146 | if (subdomain == new_subdomain) { | |
1147 | ret = -EINVAL; | |
1148 | goto out; | |
1149 | } | |
1150 | } | |
1151 | ||
f721889f RW |
1152 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
1153 | new_subdomain->parent = genpd; | |
17b75eca | 1154 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1155 | genpd->sd_count++; |
1156 | ||
f721889f | 1157 | out: |
17b75eca RW |
1158 | mutex_unlock(&new_subdomain->lock); |
1159 | genpd_release_lock(genpd); | |
f721889f RW |
1160 | |
1161 | return ret; | |
1162 | } | |
1163 | ||
1164 | /** | |
1165 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1166 | * @genpd: Master PM domain to remove the subdomain from. | |
1167 | * @target: Subdomain to be removed. | |
1168 | */ | |
1169 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
1170 | struct generic_pm_domain *target) | |
1171 | { | |
1172 | struct generic_pm_domain *subdomain; | |
1173 | int ret = -EINVAL; | |
1174 | ||
1175 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) | |
1176 | return -EINVAL; | |
1177 | ||
17b75eca RW |
1178 | start: |
1179 | genpd_acquire_lock(genpd); | |
f721889f RW |
1180 | |
1181 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1182 | if (subdomain != target) | |
1183 | continue; | |
1184 | ||
1185 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1186 | ||
17b75eca RW |
1187 | if (subdomain->status != GPD_STATE_POWER_OFF |
1188 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1189 | mutex_unlock(&subdomain->lock); | |
1190 | genpd_release_lock(genpd); | |
1191 | goto start; | |
1192 | } | |
1193 | ||
f721889f RW |
1194 | list_del(&subdomain->sd_node); |
1195 | subdomain->parent = NULL; | |
17b75eca | 1196 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1197 | genpd_sd_counter_dec(genpd); |
1198 | ||
1199 | mutex_unlock(&subdomain->lock); | |
1200 | ||
1201 | ret = 0; | |
1202 | break; | |
1203 | } | |
1204 | ||
17b75eca | 1205 | genpd_release_lock(genpd); |
f721889f RW |
1206 | |
1207 | return ret; | |
1208 | } | |
1209 | ||
1210 | /** | |
1211 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1212 | * @genpd: PM domain object to initialize. | |
1213 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1214 | * @is_off: Initial value of the domain's power_is_off field. | |
1215 | */ | |
1216 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1217 | struct dev_power_governor *gov, bool is_off) | |
1218 | { | |
1219 | if (IS_ERR_OR_NULL(genpd)) | |
1220 | return; | |
1221 | ||
1222 | INIT_LIST_HEAD(&genpd->sd_node); | |
1223 | genpd->parent = NULL; | |
1224 | INIT_LIST_HEAD(&genpd->dev_list); | |
1225 | INIT_LIST_HEAD(&genpd->sd_list); | |
1226 | mutex_init(&genpd->lock); | |
1227 | genpd->gov = gov; | |
1228 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1229 | genpd->in_progress = 0; | |
1230 | genpd->sd_count = 0; | |
17b75eca RW |
1231 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1232 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1233 | genpd->poweroff_task = NULL; |
1234 | genpd->resume_count = 0; | |
596ba34b RW |
1235 | genpd->device_count = 0; |
1236 | genpd->suspended_count = 0; | |
f721889f RW |
1237 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1238 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1239 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1240 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1241 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1242 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1243 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1244 | genpd->domain.ops.resume = pm_genpd_resume; | |
1245 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1246 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1247 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1248 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1249 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1250 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1251 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1252 | genpd->domain.ops.restore = pm_genpd_restore; | |
1253 | genpd->domain.ops.complete = pm_genpd_complete; | |
5125bbf3 RW |
1254 | mutex_lock(&gpd_list_lock); |
1255 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1256 | mutex_unlock(&gpd_list_lock); | |
1257 | } | |
1258 | ||
1259 | /** | |
1260 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
1261 | */ | |
1262 | void pm_genpd_poweroff_unused(void) | |
1263 | { | |
1264 | struct generic_pm_domain *genpd; | |
1265 | ||
1266 | mutex_lock(&gpd_list_lock); | |
1267 | ||
1268 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
1269 | genpd_queue_power_off_work(genpd); | |
1270 | ||
1271 | mutex_unlock(&gpd_list_lock); | |
f721889f | 1272 | } |