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 RW |
82 | struct generic_pm_domain *parent = genpd->parent; |
83 | DEFINE_WAIT(wait); | |
5248051b RW |
84 | int ret = 0; |
85 | ||
86 | start: | |
17b75eca | 87 | if (parent) { |
c6d22b37 | 88 | genpd_acquire_lock(parent); |
17b75eca RW |
89 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); |
90 | } else { | |
91 | mutex_lock(&genpd->lock); | |
92 | } | |
17b75eca RW |
93 | |
94 | if (genpd->status == GPD_STATE_ACTIVE | |
596ba34b | 95 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
5248051b RW |
96 | goto out; |
97 | ||
c6d22b37 RW |
98 | if (genpd->status != GPD_STATE_POWER_OFF) { |
99 | genpd_set_active(genpd); | |
100 | goto out; | |
101 | } | |
102 | ||
17b75eca | 103 | if (parent && parent->status != GPD_STATE_ACTIVE) { |
5248051b | 104 | mutex_unlock(&genpd->lock); |
c6d22b37 | 105 | genpd_release_lock(parent); |
5248051b | 106 | |
17b75eca | 107 | ret = pm_genpd_poweron(parent); |
5248051b RW |
108 | if (ret) |
109 | return ret; | |
110 | ||
111 | goto start; | |
112 | } | |
113 | ||
114 | if (genpd->power_on) { | |
115 | int ret = genpd->power_on(genpd); | |
116 | if (ret) | |
117 | goto out; | |
118 | } | |
119 | ||
c6d22b37 | 120 | genpd_set_active(genpd); |
17b75eca RW |
121 | if (parent) |
122 | parent->sd_count++; | |
5248051b RW |
123 | |
124 | out: | |
125 | mutex_unlock(&genpd->lock); | |
17b75eca | 126 | if (parent) |
c6d22b37 | 127 | genpd_release_lock(parent); |
5248051b RW |
128 | |
129 | return ret; | |
130 | } | |
131 | ||
132 | #endif /* CONFIG_PM */ | |
133 | ||
134 | #ifdef CONFIG_PM_RUNTIME | |
135 | ||
f721889f RW |
136 | /** |
137 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
138 | * @dle: Device list entry of the device to save the state of. | |
139 | * @genpd: PM domain the device belongs to. | |
140 | */ | |
141 | static int __pm_genpd_save_device(struct dev_list_entry *dle, | |
142 | struct generic_pm_domain *genpd) | |
17b75eca | 143 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
144 | { |
145 | struct device *dev = dle->dev; | |
146 | struct device_driver *drv = dev->driver; | |
147 | int ret = 0; | |
148 | ||
149 | if (dle->need_restore) | |
150 | return 0; | |
151 | ||
17b75eca RW |
152 | mutex_unlock(&genpd->lock); |
153 | ||
f721889f RW |
154 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
155 | if (genpd->start_device) | |
156 | genpd->start_device(dev); | |
157 | ||
158 | ret = drv->pm->runtime_suspend(dev); | |
159 | ||
160 | if (genpd->stop_device) | |
161 | genpd->stop_device(dev); | |
162 | } | |
163 | ||
17b75eca RW |
164 | mutex_lock(&genpd->lock); |
165 | ||
f721889f RW |
166 | if (!ret) |
167 | dle->need_restore = true; | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | /** | |
173 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
174 | * @dle: Device list entry of the device to restore the state of. | |
175 | * @genpd: PM domain the device belongs to. | |
176 | */ | |
177 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, | |
178 | struct generic_pm_domain *genpd) | |
17b75eca | 179 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
180 | { |
181 | struct device *dev = dle->dev; | |
182 | struct device_driver *drv = dev->driver; | |
183 | ||
184 | if (!dle->need_restore) | |
185 | return; | |
186 | ||
17b75eca RW |
187 | mutex_unlock(&genpd->lock); |
188 | ||
f721889f RW |
189 | if (drv && drv->pm && drv->pm->runtime_resume) { |
190 | if (genpd->start_device) | |
191 | genpd->start_device(dev); | |
192 | ||
193 | drv->pm->runtime_resume(dev); | |
194 | ||
195 | if (genpd->stop_device) | |
196 | genpd->stop_device(dev); | |
197 | } | |
198 | ||
17b75eca RW |
199 | mutex_lock(&genpd->lock); |
200 | ||
f721889f RW |
201 | dle->need_restore = false; |
202 | } | |
203 | ||
c6d22b37 RW |
204 | /** |
205 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
206 | * @genpd: PM domain to check. | |
207 | * | |
208 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
209 | * a "power off" operation, which means that a "power on" has occured in the | |
210 | * meantime, or if its resume_count field is different from zero, which means | |
211 | * that one of its devices has been resumed in the meantime. | |
212 | */ | |
213 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
214 | { | |
215 | return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; | |
216 | } | |
217 | ||
56375fd4 RW |
218 | /** |
219 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
220 | * @genpd: PM domait to power off. | |
221 | * | |
222 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
223 | * before. | |
224 | */ | |
0bc5b2de | 225 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
226 | { |
227 | if (!work_pending(&genpd->power_off_work)) | |
228 | queue_work(pm_wq, &genpd->power_off_work); | |
229 | } | |
230 | ||
f721889f RW |
231 | /** |
232 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
233 | * @genpd: PM domain to power down. | |
234 | * | |
235 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
236 | * have been powered down, run the runtime suspend callbacks provided by all of | |
237 | * the @genpd's devices' drivers and remove power from @genpd. | |
238 | */ | |
239 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 240 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
241 | { |
242 | struct generic_pm_domain *parent; | |
243 | struct dev_list_entry *dle; | |
244 | unsigned int not_suspended; | |
c6d22b37 | 245 | int ret = 0; |
f721889f | 246 | |
c6d22b37 RW |
247 | start: |
248 | /* | |
249 | * Do not try to power off the domain in the following situations: | |
250 | * (1) The domain is already in the "power off" state. | |
251 | * (2) System suspend is in progress. | |
252 | * (3) One of the domain's devices is being resumed right now. | |
253 | */ | |
254 | if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 | |
255 | || genpd->resume_count > 0) | |
f721889f RW |
256 | return 0; |
257 | ||
258 | if (genpd->sd_count > 0) | |
259 | return -EBUSY; | |
260 | ||
261 | not_suspended = 0; | |
262 | list_for_each_entry(dle, &genpd->dev_list, node) | |
263 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) | |
264 | not_suspended++; | |
265 | ||
266 | if (not_suspended > genpd->in_progress) | |
267 | return -EBUSY; | |
268 | ||
c6d22b37 RW |
269 | if (genpd->poweroff_task) { |
270 | /* | |
271 | * Another instance of pm_genpd_poweroff() is executing | |
272 | * callbacks, so tell it to start over and return. | |
273 | */ | |
274 | genpd->status = GPD_STATE_REPEAT; | |
275 | return 0; | |
276 | } | |
277 | ||
f721889f RW |
278 | if (genpd->gov && genpd->gov->power_down_ok) { |
279 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
280 | return -EAGAIN; | |
281 | } | |
282 | ||
17b75eca | 283 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 284 | genpd->poweroff_task = current; |
17b75eca | 285 | |
f721889f RW |
286 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
287 | ret = __pm_genpd_save_device(dle, genpd); | |
697a7f37 RW |
288 | if (ret) { |
289 | genpd_set_active(genpd); | |
290 | goto out; | |
291 | } | |
f721889f | 292 | |
c6d22b37 RW |
293 | if (genpd_abort_poweroff(genpd)) |
294 | goto out; | |
295 | ||
296 | if (genpd->status == GPD_STATE_REPEAT) { | |
297 | genpd->poweroff_task = NULL; | |
298 | goto start; | |
299 | } | |
300 | } | |
17b75eca RW |
301 | |
302 | parent = genpd->parent; | |
303 | if (parent) { | |
c6d22b37 RW |
304 | mutex_unlock(&genpd->lock); |
305 | ||
17b75eca RW |
306 | genpd_acquire_lock(parent); |
307 | mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); | |
c6d22b37 RW |
308 | |
309 | if (genpd_abort_poweroff(genpd)) { | |
310 | genpd_release_lock(parent); | |
311 | goto out; | |
312 | } | |
17b75eca RW |
313 | } |
314 | ||
d2805402 RW |
315 | if (genpd->power_off) { |
316 | ret = genpd->power_off(genpd); | |
317 | if (ret == -EBUSY) { | |
318 | genpd_set_active(genpd); | |
319 | if (parent) | |
320 | genpd_release_lock(parent); | |
321 | ||
322 | goto out; | |
323 | } | |
324 | } | |
f721889f | 325 | |
17b75eca | 326 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 327 | |
f721889f RW |
328 | if (parent) { |
329 | genpd_sd_counter_dec(parent); | |
330 | if (parent->sd_count == 0) | |
56375fd4 | 331 | genpd_queue_power_off_work(parent); |
17b75eca RW |
332 | |
333 | genpd_release_lock(parent); | |
f721889f RW |
334 | } |
335 | ||
c6d22b37 RW |
336 | out: |
337 | genpd->poweroff_task = NULL; | |
338 | wake_up_all(&genpd->status_wait_queue); | |
339 | return ret; | |
f721889f RW |
340 | } |
341 | ||
342 | /** | |
343 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
344 | * @work: Work structure used for scheduling the execution of this function. | |
345 | */ | |
346 | static void genpd_power_off_work_fn(struct work_struct *work) | |
347 | { | |
348 | struct generic_pm_domain *genpd; | |
349 | ||
350 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
351 | ||
17b75eca | 352 | genpd_acquire_lock(genpd); |
f721889f | 353 | pm_genpd_poweroff(genpd); |
17b75eca | 354 | genpd_release_lock(genpd); |
f721889f RW |
355 | } |
356 | ||
357 | /** | |
358 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
359 | * @dev: Device to suspend. | |
360 | * | |
361 | * Carry out a runtime suspend of a device under the assumption that its | |
362 | * pm_domain field points to the domain member of an object of type | |
363 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
364 | */ | |
365 | static int pm_genpd_runtime_suspend(struct device *dev) | |
366 | { | |
367 | struct generic_pm_domain *genpd; | |
368 | ||
369 | dev_dbg(dev, "%s()\n", __func__); | |
370 | ||
5248051b RW |
371 | genpd = dev_to_genpd(dev); |
372 | if (IS_ERR(genpd)) | |
f721889f RW |
373 | return -EINVAL; |
374 | ||
f721889f RW |
375 | if (genpd->stop_device) { |
376 | int ret = genpd->stop_device(dev); | |
377 | if (ret) | |
17b75eca | 378 | return ret; |
f721889f | 379 | } |
17b75eca | 380 | |
c6d22b37 | 381 | mutex_lock(&genpd->lock); |
f721889f RW |
382 | genpd->in_progress++; |
383 | pm_genpd_poweroff(genpd); | |
384 | genpd->in_progress--; | |
c6d22b37 | 385 | mutex_unlock(&genpd->lock); |
f721889f RW |
386 | |
387 | return 0; | |
388 | } | |
389 | ||
596ba34b RW |
390 | /** |
391 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
392 | * @dev: Device to resume. | |
393 | * @genpd: PM domain the device belongs to. | |
394 | */ | |
395 | static void __pm_genpd_runtime_resume(struct device *dev, | |
396 | struct generic_pm_domain *genpd) | |
397 | { | |
398 | struct dev_list_entry *dle; | |
399 | ||
400 | list_for_each_entry(dle, &genpd->dev_list, node) { | |
401 | if (dle->dev == dev) { | |
402 | __pm_genpd_restore_device(dle, genpd); | |
403 | break; | |
404 | } | |
405 | } | |
596ba34b RW |
406 | } |
407 | ||
f721889f RW |
408 | /** |
409 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
410 | * @dev: Device to resume. | |
411 | * | |
412 | * Carry out a runtime resume of a device under the assumption that its | |
413 | * pm_domain field points to the domain member of an object of type | |
414 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
415 | */ | |
416 | static int pm_genpd_runtime_resume(struct device *dev) | |
417 | { | |
418 | struct generic_pm_domain *genpd; | |
c6d22b37 | 419 | DEFINE_WAIT(wait); |
f721889f RW |
420 | int ret; |
421 | ||
422 | dev_dbg(dev, "%s()\n", __func__); | |
423 | ||
5248051b RW |
424 | genpd = dev_to_genpd(dev); |
425 | if (IS_ERR(genpd)) | |
f721889f RW |
426 | return -EINVAL; |
427 | ||
f721889f RW |
428 | ret = pm_genpd_poweron(genpd); |
429 | if (ret) | |
430 | return ret; | |
431 | ||
c6d22b37 | 432 | mutex_lock(&genpd->lock); |
17b75eca | 433 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
434 | genpd->resume_count++; |
435 | for (;;) { | |
436 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
437 | TASK_UNINTERRUPTIBLE); | |
438 | /* | |
439 | * If current is the powering off task, we have been called | |
440 | * reentrantly from one of the device callbacks, so we should | |
441 | * not wait. | |
442 | */ | |
443 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
444 | break; | |
445 | mutex_unlock(&genpd->lock); | |
446 | ||
447 | schedule(); | |
448 | ||
449 | mutex_lock(&genpd->lock); | |
450 | } | |
451 | finish_wait(&genpd->status_wait_queue, &wait); | |
596ba34b | 452 | __pm_genpd_runtime_resume(dev, genpd); |
c6d22b37 RW |
453 | genpd->resume_count--; |
454 | genpd_set_active(genpd); | |
17b75eca | 455 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 456 | mutex_unlock(&genpd->lock); |
17b75eca RW |
457 | |
458 | if (genpd->start_device) | |
459 | genpd->start_device(dev); | |
f721889f RW |
460 | |
461 | return 0; | |
462 | } | |
463 | ||
464 | #else | |
465 | ||
466 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
596ba34b RW |
467 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
468 | struct generic_pm_domain *genpd) {} | |
f721889f RW |
469 | |
470 | #define pm_genpd_runtime_suspend NULL | |
471 | #define pm_genpd_runtime_resume NULL | |
472 | ||
473 | #endif /* CONFIG_PM_RUNTIME */ | |
474 | ||
596ba34b RW |
475 | #ifdef CONFIG_PM_SLEEP |
476 | ||
477 | /** | |
478 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. | |
479 | * @genpd: PM domain to power off, if possible. | |
480 | * | |
481 | * Check if the given PM domain can be powered off (during system suspend or | |
482 | * hibernation) and do that if so. Also, in that case propagate to its parent. | |
483 | * | |
484 | * This function is only called in "noirq" stages of system power transitions, | |
485 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
486 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
487 | */ | |
488 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
489 | { | |
490 | struct generic_pm_domain *parent = genpd->parent; | |
491 | ||
17b75eca | 492 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
493 | return; |
494 | ||
495 | if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) | |
496 | return; | |
497 | ||
498 | if (genpd->power_off) | |
499 | genpd->power_off(genpd); | |
500 | ||
17b75eca | 501 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
502 | if (parent) { |
503 | genpd_sd_counter_dec(parent); | |
504 | pm_genpd_sync_poweroff(parent); | |
505 | } | |
506 | } | |
507 | ||
4ecd6e65 RW |
508 | /** |
509 | * resume_needed - Check whether to resume a device before system suspend. | |
510 | * @dev: Device to check. | |
511 | * @genpd: PM domain the device belongs to. | |
512 | * | |
513 | * There are two cases in which a device that can wake up the system from sleep | |
514 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
515 | * to wake up the system and it has to remain active for this purpose while the | |
516 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
517 | * the system from sleep states and it generally doesn't generate wakeup signals | |
518 | * by itself (those signals are generated on its behalf by other parts of the | |
519 | * system). In the latter case it may be necessary to reconfigure the device's | |
520 | * wakeup settings during system suspend, because it may have been set up to | |
521 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
522 | * Return 'true' in either of the above cases. | |
523 | */ | |
524 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
525 | { | |
526 | bool active_wakeup; | |
527 | ||
528 | if (!device_can_wakeup(dev)) | |
529 | return false; | |
530 | ||
531 | active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); | |
532 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; | |
533 | } | |
534 | ||
596ba34b RW |
535 | /** |
536 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
537 | * @dev: Device to start the transition of. | |
538 | * | |
539 | * Start a power transition of a device (during a system-wide power transition) | |
540 | * under the assumption that its pm_domain field points to the domain member of | |
541 | * an object of type struct generic_pm_domain representing a PM domain | |
542 | * consisting of I/O devices. | |
543 | */ | |
544 | static int pm_genpd_prepare(struct device *dev) | |
545 | { | |
546 | struct generic_pm_domain *genpd; | |
b6c10c84 | 547 | int ret; |
596ba34b RW |
548 | |
549 | dev_dbg(dev, "%s()\n", __func__); | |
550 | ||
551 | genpd = dev_to_genpd(dev); | |
552 | if (IS_ERR(genpd)) | |
553 | return -EINVAL; | |
554 | ||
17b75eca RW |
555 | /* |
556 | * If a wakeup request is pending for the device, it should be woken up | |
557 | * at this point and a system wakeup event should be reported if it's | |
558 | * set up to wake up the system from sleep states. | |
559 | */ | |
560 | pm_runtime_get_noresume(dev); | |
561 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
562 | pm_wakeup_event(dev, 0); | |
563 | ||
564 | if (pm_wakeup_pending()) { | |
565 | pm_runtime_put_sync(dev); | |
566 | return -EBUSY; | |
567 | } | |
568 | ||
4ecd6e65 RW |
569 | if (resume_needed(dev, genpd)) |
570 | pm_runtime_resume(dev); | |
571 | ||
17b75eca | 572 | genpd_acquire_lock(genpd); |
596ba34b RW |
573 | |
574 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
575 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
576 | ||
577 | genpd_release_lock(genpd); | |
596ba34b RW |
578 | |
579 | if (genpd->suspend_power_off) { | |
17b75eca | 580 | pm_runtime_put_noidle(dev); |
596ba34b RW |
581 | return 0; |
582 | } | |
583 | ||
584 | /* | |
17b75eca RW |
585 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
586 | * so pm_genpd_poweron() will return immediately, but if the device | |
587 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
588 | * to make it operational. | |
596ba34b | 589 | */ |
17b75eca | 590 | pm_runtime_resume(dev); |
596ba34b RW |
591 | __pm_runtime_disable(dev, false); |
592 | ||
b6c10c84 RW |
593 | ret = pm_generic_prepare(dev); |
594 | if (ret) { | |
595 | mutex_lock(&genpd->lock); | |
596 | ||
597 | if (--genpd->prepared_count == 0) | |
598 | genpd->suspend_power_off = false; | |
599 | ||
600 | mutex_unlock(&genpd->lock); | |
17b75eca | 601 | pm_runtime_enable(dev); |
b6c10c84 | 602 | } |
17b75eca RW |
603 | |
604 | pm_runtime_put_sync(dev); | |
b6c10c84 | 605 | return ret; |
596ba34b RW |
606 | } |
607 | ||
608 | /** | |
609 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
610 | * @dev: Device to suspend. | |
611 | * | |
612 | * Suspend a device under the assumption that its pm_domain field points to the | |
613 | * domain member of an object of type struct generic_pm_domain representing | |
614 | * a PM domain consisting of I/O devices. | |
615 | */ | |
616 | static int pm_genpd_suspend(struct device *dev) | |
617 | { | |
618 | struct generic_pm_domain *genpd; | |
619 | ||
620 | dev_dbg(dev, "%s()\n", __func__); | |
621 | ||
622 | genpd = dev_to_genpd(dev); | |
623 | if (IS_ERR(genpd)) | |
624 | return -EINVAL; | |
625 | ||
626 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
627 | } | |
628 | ||
629 | /** | |
630 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
631 | * @dev: Device to suspend. | |
632 | * | |
633 | * Carry out a late suspend of a device under the assumption that its | |
634 | * pm_domain field points to the domain member of an object of type | |
635 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
636 | */ | |
637 | static int pm_genpd_suspend_noirq(struct device *dev) | |
638 | { | |
639 | struct generic_pm_domain *genpd; | |
640 | int ret; | |
641 | ||
642 | dev_dbg(dev, "%s()\n", __func__); | |
643 | ||
644 | genpd = dev_to_genpd(dev); | |
645 | if (IS_ERR(genpd)) | |
646 | return -EINVAL; | |
647 | ||
648 | if (genpd->suspend_power_off) | |
649 | return 0; | |
650 | ||
651 | ret = pm_generic_suspend_noirq(dev); | |
652 | if (ret) | |
653 | return ret; | |
654 | ||
d4f2d87a RW |
655 | if (device_may_wakeup(dev) |
656 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
657 | return 0; | |
658 | ||
596ba34b RW |
659 | if (genpd->stop_device) |
660 | genpd->stop_device(dev); | |
661 | ||
662 | /* | |
663 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
664 | * guaranteed that this function will never run twice in parallel for | |
665 | * the same PM domain, so it is not necessary to use locking here. | |
666 | */ | |
667 | genpd->suspended_count++; | |
668 | pm_genpd_sync_poweroff(genpd); | |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | /** | |
674 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
675 | * @dev: Device to resume. | |
676 | * | |
677 | * Carry out an early resume of a device under the assumption that its | |
678 | * pm_domain field points to the domain member of an object of type | |
679 | * struct generic_pm_domain representing a power domain consisting of I/O | |
680 | * devices. | |
681 | */ | |
682 | static int pm_genpd_resume_noirq(struct device *dev) | |
683 | { | |
684 | struct generic_pm_domain *genpd; | |
685 | ||
686 | dev_dbg(dev, "%s()\n", __func__); | |
687 | ||
688 | genpd = dev_to_genpd(dev); | |
689 | if (IS_ERR(genpd)) | |
690 | return -EINVAL; | |
691 | ||
692 | if (genpd->suspend_power_off) | |
693 | return 0; | |
694 | ||
695 | /* | |
696 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
697 | * guaranteed that this function will never run twice in parallel for | |
698 | * the same PM domain, so it is not necessary to use locking here. | |
699 | */ | |
700 | pm_genpd_poweron(genpd); | |
701 | genpd->suspended_count--; | |
702 | if (genpd->start_device) | |
703 | genpd->start_device(dev); | |
704 | ||
705 | return pm_generic_resume_noirq(dev); | |
706 | } | |
707 | ||
708 | /** | |
709 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
710 | * @dev: Device to resume. | |
711 | * | |
712 | * Resume a device under the assumption that its pm_domain field points to the | |
713 | * domain member of an object of type struct generic_pm_domain representing | |
714 | * a power domain consisting of I/O devices. | |
715 | */ | |
716 | static int pm_genpd_resume(struct device *dev) | |
717 | { | |
718 | struct generic_pm_domain *genpd; | |
719 | ||
720 | dev_dbg(dev, "%s()\n", __func__); | |
721 | ||
722 | genpd = dev_to_genpd(dev); | |
723 | if (IS_ERR(genpd)) | |
724 | return -EINVAL; | |
725 | ||
726 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
727 | } | |
728 | ||
729 | /** | |
730 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
731 | * @dev: Device to freeze. | |
732 | * | |
733 | * Freeze a device under the assumption that its pm_domain field points to the | |
734 | * domain member of an object of type struct generic_pm_domain representing | |
735 | * a power domain consisting of I/O devices. | |
736 | */ | |
737 | static int pm_genpd_freeze(struct device *dev) | |
738 | { | |
739 | struct generic_pm_domain *genpd; | |
740 | ||
741 | dev_dbg(dev, "%s()\n", __func__); | |
742 | ||
743 | genpd = dev_to_genpd(dev); | |
744 | if (IS_ERR(genpd)) | |
745 | return -EINVAL; | |
746 | ||
747 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
748 | } | |
749 | ||
750 | /** | |
751 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
752 | * @dev: Device to freeze. | |
753 | * | |
754 | * Carry out a late freeze of a device under the assumption that its | |
755 | * pm_domain field points to the domain member of an object of type | |
756 | * struct generic_pm_domain representing a power domain consisting of I/O | |
757 | * devices. | |
758 | */ | |
759 | static int pm_genpd_freeze_noirq(struct device *dev) | |
760 | { | |
761 | struct generic_pm_domain *genpd; | |
762 | int ret; | |
763 | ||
764 | dev_dbg(dev, "%s()\n", __func__); | |
765 | ||
766 | genpd = dev_to_genpd(dev); | |
767 | if (IS_ERR(genpd)) | |
768 | return -EINVAL; | |
769 | ||
770 | if (genpd->suspend_power_off) | |
771 | return 0; | |
772 | ||
773 | ret = pm_generic_freeze_noirq(dev); | |
774 | if (ret) | |
775 | return ret; | |
776 | ||
777 | if (genpd->stop_device) | |
778 | genpd->stop_device(dev); | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | /** | |
784 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
785 | * @dev: Device to thaw. | |
786 | * | |
787 | * Carry out an early thaw of a device under the assumption that its | |
788 | * pm_domain field points to the domain member of an object of type | |
789 | * struct generic_pm_domain representing a power domain consisting of I/O | |
790 | * devices. | |
791 | */ | |
792 | static int pm_genpd_thaw_noirq(struct device *dev) | |
793 | { | |
794 | struct generic_pm_domain *genpd; | |
795 | ||
796 | dev_dbg(dev, "%s()\n", __func__); | |
797 | ||
798 | genpd = dev_to_genpd(dev); | |
799 | if (IS_ERR(genpd)) | |
800 | return -EINVAL; | |
801 | ||
802 | if (genpd->suspend_power_off) | |
803 | return 0; | |
804 | ||
805 | if (genpd->start_device) | |
806 | genpd->start_device(dev); | |
807 | ||
808 | return pm_generic_thaw_noirq(dev); | |
809 | } | |
810 | ||
811 | /** | |
812 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
813 | * @dev: Device to thaw. | |
814 | * | |
815 | * Thaw a device under the assumption that its pm_domain field points to the | |
816 | * domain member of an object of type struct generic_pm_domain representing | |
817 | * a power domain consisting of I/O devices. | |
818 | */ | |
819 | static int pm_genpd_thaw(struct device *dev) | |
820 | { | |
821 | struct generic_pm_domain *genpd; | |
822 | ||
823 | dev_dbg(dev, "%s()\n", __func__); | |
824 | ||
825 | genpd = dev_to_genpd(dev); | |
826 | if (IS_ERR(genpd)) | |
827 | return -EINVAL; | |
828 | ||
829 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
830 | } | |
831 | ||
832 | /** | |
833 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
834 | * @dev: Device to suspend. | |
835 | * | |
836 | * Power off a device under the assumption that its pm_domain field points to | |
837 | * the domain member of an object of type struct generic_pm_domain representing | |
838 | * a PM domain consisting of I/O devices. | |
839 | */ | |
840 | static int pm_genpd_dev_poweroff(struct device *dev) | |
841 | { | |
842 | struct generic_pm_domain *genpd; | |
843 | ||
844 | dev_dbg(dev, "%s()\n", __func__); | |
845 | ||
846 | genpd = dev_to_genpd(dev); | |
847 | if (IS_ERR(genpd)) | |
848 | return -EINVAL; | |
849 | ||
850 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
851 | } | |
852 | ||
853 | /** | |
854 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
855 | * @dev: Device to suspend. | |
856 | * | |
857 | * Carry out a late powering off of a device under the assumption that its | |
858 | * pm_domain field points to the domain member of an object of type | |
859 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
860 | */ | |
861 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
862 | { | |
863 | struct generic_pm_domain *genpd; | |
864 | int ret; | |
865 | ||
866 | dev_dbg(dev, "%s()\n", __func__); | |
867 | ||
868 | genpd = dev_to_genpd(dev); | |
869 | if (IS_ERR(genpd)) | |
870 | return -EINVAL; | |
871 | ||
872 | if (genpd->suspend_power_off) | |
873 | return 0; | |
874 | ||
875 | ret = pm_generic_poweroff_noirq(dev); | |
876 | if (ret) | |
877 | return ret; | |
878 | ||
d4f2d87a RW |
879 | if (device_may_wakeup(dev) |
880 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
881 | return 0; | |
882 | ||
596ba34b RW |
883 | if (genpd->stop_device) |
884 | genpd->stop_device(dev); | |
885 | ||
886 | /* | |
887 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
888 | * guaranteed that this function will never run twice in parallel for | |
889 | * the same PM domain, so it is not necessary to use locking here. | |
890 | */ | |
891 | genpd->suspended_count++; | |
892 | pm_genpd_sync_poweroff(genpd); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | /** | |
898 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
899 | * @dev: Device to resume. | |
900 | * | |
901 | * Carry out an early restore of a device under the assumption that its | |
902 | * pm_domain field points to the domain member of an object of type | |
903 | * struct generic_pm_domain representing a power domain consisting of I/O | |
904 | * devices. | |
905 | */ | |
906 | static int pm_genpd_restore_noirq(struct device *dev) | |
907 | { | |
908 | struct generic_pm_domain *genpd; | |
909 | ||
910 | dev_dbg(dev, "%s()\n", __func__); | |
911 | ||
912 | genpd = dev_to_genpd(dev); | |
913 | if (IS_ERR(genpd)) | |
914 | return -EINVAL; | |
915 | ||
916 | /* | |
917 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
918 | * guaranteed that this function will never run twice in parallel for | |
919 | * the same PM domain, so it is not necessary to use locking here. | |
920 | */ | |
17b75eca | 921 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
922 | if (genpd->suspend_power_off) { |
923 | /* | |
924 | * The boot kernel might put the domain into the power on state, | |
925 | * so make sure it really is powered off. | |
926 | */ | |
927 | if (genpd->power_off) | |
928 | genpd->power_off(genpd); | |
929 | return 0; | |
930 | } | |
931 | ||
932 | pm_genpd_poweron(genpd); | |
933 | genpd->suspended_count--; | |
934 | if (genpd->start_device) | |
935 | genpd->start_device(dev); | |
936 | ||
937 | return pm_generic_restore_noirq(dev); | |
938 | } | |
939 | ||
940 | /** | |
941 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
942 | * @dev: Device to resume. | |
943 | * | |
944 | * Restore a device under the assumption that its pm_domain field points to the | |
945 | * domain member of an object of type struct generic_pm_domain representing | |
946 | * a power domain consisting of I/O devices. | |
947 | */ | |
948 | static int pm_genpd_restore(struct device *dev) | |
949 | { | |
950 | struct generic_pm_domain *genpd; | |
951 | ||
952 | dev_dbg(dev, "%s()\n", __func__); | |
953 | ||
954 | genpd = dev_to_genpd(dev); | |
955 | if (IS_ERR(genpd)) | |
956 | return -EINVAL; | |
957 | ||
958 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
959 | } | |
960 | ||
961 | /** | |
962 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
963 | * @dev: Device to complete the transition of. | |
964 | * | |
965 | * Complete a power transition of a device (during a system-wide power | |
966 | * transition) under the assumption that its pm_domain field points to the | |
967 | * domain member of an object of type struct generic_pm_domain representing | |
968 | * a power domain consisting of I/O devices. | |
969 | */ | |
970 | static void pm_genpd_complete(struct device *dev) | |
971 | { | |
972 | struct generic_pm_domain *genpd; | |
973 | bool run_complete; | |
974 | ||
975 | dev_dbg(dev, "%s()\n", __func__); | |
976 | ||
977 | genpd = dev_to_genpd(dev); | |
978 | if (IS_ERR(genpd)) | |
979 | return; | |
980 | ||
981 | mutex_lock(&genpd->lock); | |
982 | ||
983 | run_complete = !genpd->suspend_power_off; | |
984 | if (--genpd->prepared_count == 0) | |
985 | genpd->suspend_power_off = false; | |
986 | ||
987 | mutex_unlock(&genpd->lock); | |
988 | ||
989 | if (run_complete) { | |
990 | pm_generic_complete(dev); | |
6f00ff78 | 991 | pm_runtime_set_active(dev); |
596ba34b | 992 | pm_runtime_enable(dev); |
6f00ff78 | 993 | pm_runtime_idle(dev); |
596ba34b RW |
994 | } |
995 | } | |
996 | ||
997 | #else | |
998 | ||
999 | #define pm_genpd_prepare NULL | |
1000 | #define pm_genpd_suspend NULL | |
1001 | #define pm_genpd_suspend_noirq NULL | |
1002 | #define pm_genpd_resume_noirq NULL | |
1003 | #define pm_genpd_resume NULL | |
1004 | #define pm_genpd_freeze NULL | |
1005 | #define pm_genpd_freeze_noirq NULL | |
1006 | #define pm_genpd_thaw_noirq NULL | |
1007 | #define pm_genpd_thaw NULL | |
1008 | #define pm_genpd_dev_poweroff_noirq NULL | |
1009 | #define pm_genpd_dev_poweroff NULL | |
1010 | #define pm_genpd_restore_noirq NULL | |
1011 | #define pm_genpd_restore NULL | |
1012 | #define pm_genpd_complete NULL | |
1013 | ||
1014 | #endif /* CONFIG_PM_SLEEP */ | |
1015 | ||
f721889f RW |
1016 | /** |
1017 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
1018 | * @genpd: PM domain to add the device to. | |
1019 | * @dev: Device to be added. | |
1020 | */ | |
1021 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
1022 | { | |
1023 | struct dev_list_entry *dle; | |
1024 | int ret = 0; | |
1025 | ||
1026 | dev_dbg(dev, "%s()\n", __func__); | |
1027 | ||
1028 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1029 | return -EINVAL; | |
1030 | ||
17b75eca | 1031 | genpd_acquire_lock(genpd); |
f721889f | 1032 | |
17b75eca | 1033 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1034 | ret = -EINVAL; |
1035 | goto out; | |
1036 | } | |
1037 | ||
596ba34b RW |
1038 | if (genpd->prepared_count > 0) { |
1039 | ret = -EAGAIN; | |
1040 | goto out; | |
1041 | } | |
1042 | ||
f721889f RW |
1043 | list_for_each_entry(dle, &genpd->dev_list, node) |
1044 | if (dle->dev == dev) { | |
1045 | ret = -EINVAL; | |
1046 | goto out; | |
1047 | } | |
1048 | ||
1049 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); | |
1050 | if (!dle) { | |
1051 | ret = -ENOMEM; | |
1052 | goto out; | |
1053 | } | |
1054 | ||
1055 | dle->dev = dev; | |
1056 | dle->need_restore = false; | |
1057 | list_add_tail(&dle->node, &genpd->dev_list); | |
596ba34b | 1058 | genpd->device_count++; |
f721889f RW |
1059 | |
1060 | spin_lock_irq(&dev->power.lock); | |
1061 | dev->pm_domain = &genpd->domain; | |
1062 | spin_unlock_irq(&dev->power.lock); | |
1063 | ||
1064 | out: | |
17b75eca | 1065 | genpd_release_lock(genpd); |
f721889f RW |
1066 | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1072 | * @genpd: PM domain to remove the device from. | |
1073 | * @dev: Device to be removed. | |
1074 | */ | |
1075 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1076 | struct device *dev) | |
1077 | { | |
1078 | struct dev_list_entry *dle; | |
1079 | int ret = -EINVAL; | |
1080 | ||
1081 | dev_dbg(dev, "%s()\n", __func__); | |
1082 | ||
1083 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1084 | return -EINVAL; | |
1085 | ||
17b75eca | 1086 | genpd_acquire_lock(genpd); |
f721889f | 1087 | |
596ba34b RW |
1088 | if (genpd->prepared_count > 0) { |
1089 | ret = -EAGAIN; | |
1090 | goto out; | |
1091 | } | |
1092 | ||
f721889f RW |
1093 | list_for_each_entry(dle, &genpd->dev_list, node) { |
1094 | if (dle->dev != dev) | |
1095 | continue; | |
1096 | ||
1097 | spin_lock_irq(&dev->power.lock); | |
1098 | dev->pm_domain = NULL; | |
1099 | spin_unlock_irq(&dev->power.lock); | |
1100 | ||
596ba34b | 1101 | genpd->device_count--; |
f721889f RW |
1102 | list_del(&dle->node); |
1103 | kfree(dle); | |
1104 | ||
1105 | ret = 0; | |
1106 | break; | |
1107 | } | |
1108 | ||
596ba34b | 1109 | out: |
17b75eca | 1110 | genpd_release_lock(genpd); |
f721889f RW |
1111 | |
1112 | return ret; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1117 | * @genpd: Master PM domain to add the subdomain to. | |
1118 | * @new_subdomain: Subdomain to be added. | |
1119 | */ | |
1120 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1121 | struct generic_pm_domain *new_subdomain) | |
1122 | { | |
1123 | struct generic_pm_domain *subdomain; | |
1124 | int ret = 0; | |
1125 | ||
1126 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) | |
1127 | return -EINVAL; | |
1128 | ||
17b75eca RW |
1129 | start: |
1130 | genpd_acquire_lock(genpd); | |
1131 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1132 | |
17b75eca RW |
1133 | if (new_subdomain->status != GPD_STATE_POWER_OFF |
1134 | && new_subdomain->status != GPD_STATE_ACTIVE) { | |
1135 | mutex_unlock(&new_subdomain->lock); | |
1136 | genpd_release_lock(genpd); | |
1137 | goto start; | |
1138 | } | |
1139 | ||
1140 | if (genpd->status == GPD_STATE_POWER_OFF | |
1141 | && new_subdomain->status != GPD_STATE_POWER_OFF) { | |
f721889f RW |
1142 | ret = -EINVAL; |
1143 | goto out; | |
1144 | } | |
1145 | ||
1146 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1147 | if (subdomain == new_subdomain) { | |
1148 | ret = -EINVAL; | |
1149 | goto out; | |
1150 | } | |
1151 | } | |
1152 | ||
f721889f RW |
1153 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
1154 | new_subdomain->parent = genpd; | |
17b75eca | 1155 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1156 | genpd->sd_count++; |
1157 | ||
f721889f | 1158 | out: |
17b75eca RW |
1159 | mutex_unlock(&new_subdomain->lock); |
1160 | genpd_release_lock(genpd); | |
f721889f RW |
1161 | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | /** | |
1166 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1167 | * @genpd: Master PM domain to remove the subdomain from. | |
1168 | * @target: Subdomain to be removed. | |
1169 | */ | |
1170 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
1171 | struct generic_pm_domain *target) | |
1172 | { | |
1173 | struct generic_pm_domain *subdomain; | |
1174 | int ret = -EINVAL; | |
1175 | ||
1176 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) | |
1177 | return -EINVAL; | |
1178 | ||
17b75eca RW |
1179 | start: |
1180 | genpd_acquire_lock(genpd); | |
f721889f RW |
1181 | |
1182 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1183 | if (subdomain != target) | |
1184 | continue; | |
1185 | ||
1186 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1187 | ||
17b75eca RW |
1188 | if (subdomain->status != GPD_STATE_POWER_OFF |
1189 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1190 | mutex_unlock(&subdomain->lock); | |
1191 | genpd_release_lock(genpd); | |
1192 | goto start; | |
1193 | } | |
1194 | ||
f721889f RW |
1195 | list_del(&subdomain->sd_node); |
1196 | subdomain->parent = NULL; | |
17b75eca | 1197 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1198 | genpd_sd_counter_dec(genpd); |
1199 | ||
1200 | mutex_unlock(&subdomain->lock); | |
1201 | ||
1202 | ret = 0; | |
1203 | break; | |
1204 | } | |
1205 | ||
17b75eca | 1206 | genpd_release_lock(genpd); |
f721889f RW |
1207 | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1213 | * @genpd: PM domain object to initialize. | |
1214 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1215 | * @is_off: Initial value of the domain's power_is_off field. | |
1216 | */ | |
1217 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1218 | struct dev_power_governor *gov, bool is_off) | |
1219 | { | |
1220 | if (IS_ERR_OR_NULL(genpd)) | |
1221 | return; | |
1222 | ||
1223 | INIT_LIST_HEAD(&genpd->sd_node); | |
1224 | genpd->parent = NULL; | |
1225 | INIT_LIST_HEAD(&genpd->dev_list); | |
1226 | INIT_LIST_HEAD(&genpd->sd_list); | |
1227 | mutex_init(&genpd->lock); | |
1228 | genpd->gov = gov; | |
1229 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1230 | genpd->in_progress = 0; | |
1231 | genpd->sd_count = 0; | |
17b75eca RW |
1232 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1233 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1234 | genpd->poweroff_task = NULL; |
1235 | genpd->resume_count = 0; | |
596ba34b RW |
1236 | genpd->device_count = 0; |
1237 | genpd->suspended_count = 0; | |
f721889f RW |
1238 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1239 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1240 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1241 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1242 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1243 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1244 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1245 | genpd->domain.ops.resume = pm_genpd_resume; | |
1246 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1247 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1248 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1249 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1250 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1251 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1252 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1253 | genpd->domain.ops.restore = pm_genpd_restore; | |
1254 | genpd->domain.ops.complete = pm_genpd_complete; | |
5125bbf3 RW |
1255 | mutex_lock(&gpd_list_lock); |
1256 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1257 | mutex_unlock(&gpd_list_lock); | |
1258 | } | |
1259 | ||
1260 | /** | |
1261 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
1262 | */ | |
1263 | void pm_genpd_poweroff_unused(void) | |
1264 | { | |
1265 | struct generic_pm_domain *genpd; | |
1266 | ||
1267 | mutex_lock(&gpd_list_lock); | |
1268 | ||
1269 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
1270 | genpd_queue_power_off_work(genpd); | |
1271 | ||
1272 | mutex_unlock(&gpd_list_lock); | |
f721889f | 1273 | } |