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 | 31 | |
c4bb3160 | 32 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 33 | { |
c4bb3160 RW |
34 | bool ret = false; |
35 | ||
36 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
37 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
43 | { | |
44 | atomic_inc(&genpd->sd_count); | |
45 | smp_mb__after_atomic_inc(); | |
f721889f RW |
46 | } |
47 | ||
17b75eca RW |
48 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
49 | { | |
50 | DEFINE_WAIT(wait); | |
51 | ||
52 | mutex_lock(&genpd->lock); | |
53 | /* | |
54 | * Wait for the domain to transition into either the active, | |
55 | * or the power off state. | |
56 | */ | |
57 | for (;;) { | |
58 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
59 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
60 | if (genpd->status == GPD_STATE_ACTIVE |
61 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
62 | break; |
63 | mutex_unlock(&genpd->lock); | |
64 | ||
65 | schedule(); | |
66 | ||
67 | mutex_lock(&genpd->lock); | |
68 | } | |
69 | finish_wait(&genpd->status_wait_queue, &wait); | |
70 | } | |
71 | ||
72 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
73 | { | |
74 | mutex_unlock(&genpd->lock); | |
75 | } | |
76 | ||
c6d22b37 RW |
77 | static void genpd_set_active(struct generic_pm_domain *genpd) |
78 | { | |
79 | if (genpd->resume_count == 0) | |
80 | genpd->status = GPD_STATE_ACTIVE; | |
81 | } | |
82 | ||
5248051b | 83 | /** |
3f241775 | 84 | * __pm_genpd_poweron - Restore power to a given PM domain and its parents. |
5248051b RW |
85 | * @genpd: PM domain to power up. |
86 | * | |
87 | * Restore power to @genpd and all of its parents so that it is possible to | |
88 | * resume a device belonging to it. | |
89 | */ | |
3f241775 RW |
90 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
91 | __releases(&genpd->lock) __acquires(&genpd->lock) | |
5248051b | 92 | { |
3f241775 | 93 | DEFINE_WAIT(wait); |
5248051b RW |
94 | int ret = 0; |
95 | ||
3f241775 RW |
96 | /* If the domain's parent is being waited for, we have to wait too. */ |
97 | for (;;) { | |
98 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
99 | TASK_UNINTERRUPTIBLE); | |
100 | if (genpd->status != GPD_STATE_WAIT_PARENT) | |
101 | break; | |
102 | mutex_unlock(&genpd->lock); | |
17b75eca | 103 | |
3f241775 RW |
104 | schedule(); |
105 | ||
106 | mutex_lock(&genpd->lock); | |
107 | } | |
108 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 109 | |
17b75eca | 110 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 111 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 112 | return 0; |
5248051b | 113 | |
c6d22b37 RW |
114 | if (genpd->status != GPD_STATE_POWER_OFF) { |
115 | genpd_set_active(genpd); | |
3f241775 | 116 | return 0; |
c6d22b37 RW |
117 | } |
118 | ||
3f241775 RW |
119 | if (genpd->parent) { |
120 | genpd_sd_counter_inc(genpd->parent); | |
121 | genpd->status = GPD_STATE_WAIT_PARENT; | |
3c07cbc4 | 122 | |
5248051b | 123 | mutex_unlock(&genpd->lock); |
5248051b | 124 | |
3f241775 | 125 | ret = pm_genpd_poweron(genpd->parent); |
9e08cf42 RW |
126 | |
127 | mutex_lock(&genpd->lock); | |
128 | ||
3f241775 RW |
129 | /* |
130 | * The "wait for parent" status is guaranteed not to change | |
131 | * while the parent is powering on. | |
132 | */ | |
133 | genpd->status = GPD_STATE_POWER_OFF; | |
134 | wake_up_all(&genpd->status_wait_queue); | |
9e08cf42 RW |
135 | if (ret) |
136 | goto err; | |
5248051b RW |
137 | } |
138 | ||
9e08cf42 | 139 | if (genpd->power_on) { |
fe202fde | 140 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
141 | if (ret) |
142 | goto err; | |
3c07cbc4 | 143 | } |
5248051b | 144 | |
9e08cf42 RW |
145 | genpd_set_active(genpd); |
146 | ||
3f241775 | 147 | return 0; |
9e08cf42 RW |
148 | |
149 | err: | |
150 | if (genpd->parent) | |
151 | genpd_sd_counter_dec(genpd->parent); | |
152 | ||
3f241775 RW |
153 | return ret; |
154 | } | |
155 | ||
156 | /** | |
157 | * pm_genpd_poweron - Restore power to a given PM domain and its parents. | |
158 | * @genpd: PM domain to power up. | |
159 | */ | |
160 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
161 | { | |
162 | int ret; | |
163 | ||
164 | mutex_lock(&genpd->lock); | |
165 | ret = __pm_genpd_poweron(genpd); | |
166 | mutex_unlock(&genpd->lock); | |
167 | return ret; | |
5248051b RW |
168 | } |
169 | ||
170 | #endif /* CONFIG_PM */ | |
171 | ||
172 | #ifdef CONFIG_PM_RUNTIME | |
173 | ||
f721889f RW |
174 | /** |
175 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
176 | * @dle: Device list entry of the device to save the state of. | |
177 | * @genpd: PM domain the device belongs to. | |
178 | */ | |
179 | static int __pm_genpd_save_device(struct dev_list_entry *dle, | |
180 | struct generic_pm_domain *genpd) | |
17b75eca | 181 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
182 | { |
183 | struct device *dev = dle->dev; | |
184 | struct device_driver *drv = dev->driver; | |
185 | int ret = 0; | |
186 | ||
187 | if (dle->need_restore) | |
188 | return 0; | |
189 | ||
17b75eca RW |
190 | mutex_unlock(&genpd->lock); |
191 | ||
f721889f RW |
192 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
193 | if (genpd->start_device) | |
194 | genpd->start_device(dev); | |
195 | ||
196 | ret = drv->pm->runtime_suspend(dev); | |
197 | ||
198 | if (genpd->stop_device) | |
199 | genpd->stop_device(dev); | |
200 | } | |
201 | ||
17b75eca RW |
202 | mutex_lock(&genpd->lock); |
203 | ||
f721889f RW |
204 | if (!ret) |
205 | dle->need_restore = true; | |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | /** | |
211 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
212 | * @dle: Device list entry of the device to restore the state of. | |
213 | * @genpd: PM domain the device belongs to. | |
214 | */ | |
215 | static void __pm_genpd_restore_device(struct dev_list_entry *dle, | |
216 | struct generic_pm_domain *genpd) | |
17b75eca | 217 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
218 | { |
219 | struct device *dev = dle->dev; | |
220 | struct device_driver *drv = dev->driver; | |
221 | ||
222 | if (!dle->need_restore) | |
223 | return; | |
224 | ||
17b75eca RW |
225 | mutex_unlock(&genpd->lock); |
226 | ||
f721889f RW |
227 | if (drv && drv->pm && drv->pm->runtime_resume) { |
228 | if (genpd->start_device) | |
229 | genpd->start_device(dev); | |
230 | ||
231 | drv->pm->runtime_resume(dev); | |
232 | ||
233 | if (genpd->stop_device) | |
234 | genpd->stop_device(dev); | |
235 | } | |
236 | ||
17b75eca RW |
237 | mutex_lock(&genpd->lock); |
238 | ||
f721889f RW |
239 | dle->need_restore = false; |
240 | } | |
241 | ||
c6d22b37 RW |
242 | /** |
243 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
244 | * @genpd: PM domain to check. | |
245 | * | |
246 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
247 | * a "power off" operation, which means that a "power on" has occured in the | |
248 | * meantime, or if its resume_count field is different from zero, which means | |
249 | * that one of its devices has been resumed in the meantime. | |
250 | */ | |
251 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
252 | { | |
3f241775 RW |
253 | return genpd->status == GPD_STATE_WAIT_PARENT |
254 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; | |
c6d22b37 RW |
255 | } |
256 | ||
56375fd4 RW |
257 | /** |
258 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
259 | * @genpd: PM domait to power off. | |
260 | * | |
261 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
262 | * before. | |
263 | */ | |
0bc5b2de | 264 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
265 | { |
266 | if (!work_pending(&genpd->power_off_work)) | |
267 | queue_work(pm_wq, &genpd->power_off_work); | |
268 | } | |
269 | ||
f721889f RW |
270 | /** |
271 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
272 | * @genpd: PM domain to power down. | |
273 | * | |
274 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
275 | * have been powered down, run the runtime suspend callbacks provided by all of | |
276 | * the @genpd's devices' drivers and remove power from @genpd. | |
277 | */ | |
278 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 279 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f RW |
280 | { |
281 | struct generic_pm_domain *parent; | |
282 | struct dev_list_entry *dle; | |
283 | unsigned int not_suspended; | |
c6d22b37 | 284 | int ret = 0; |
f721889f | 285 | |
c6d22b37 RW |
286 | start: |
287 | /* | |
288 | * Do not try to power off the domain in the following situations: | |
289 | * (1) The domain is already in the "power off" state. | |
3f241775 | 290 | * (2) The domain is waiting for its parent to power up. |
c6d22b37 | 291 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 292 | * (4) System suspend is in progress. |
c6d22b37 | 293 | */ |
3f241775 RW |
294 | if (genpd->status == GPD_STATE_POWER_OFF |
295 | || genpd->status == GPD_STATE_WAIT_PARENT | |
296 | || genpd->resume_count > 0 || genpd->prepared_count > 0) | |
f721889f RW |
297 | return 0; |
298 | ||
c4bb3160 | 299 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
300 | return -EBUSY; |
301 | ||
302 | not_suspended = 0; | |
303 | list_for_each_entry(dle, &genpd->dev_list, node) | |
304 | if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) | |
305 | not_suspended++; | |
306 | ||
307 | if (not_suspended > genpd->in_progress) | |
308 | return -EBUSY; | |
309 | ||
c6d22b37 RW |
310 | if (genpd->poweroff_task) { |
311 | /* | |
312 | * Another instance of pm_genpd_poweroff() is executing | |
313 | * callbacks, so tell it to start over and return. | |
314 | */ | |
315 | genpd->status = GPD_STATE_REPEAT; | |
316 | return 0; | |
317 | } | |
318 | ||
f721889f RW |
319 | if (genpd->gov && genpd->gov->power_down_ok) { |
320 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
321 | return -EAGAIN; | |
322 | } | |
323 | ||
17b75eca | 324 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 325 | genpd->poweroff_task = current; |
17b75eca | 326 | |
f721889f | 327 | list_for_each_entry_reverse(dle, &genpd->dev_list, node) { |
3c07cbc4 RW |
328 | ret = atomic_read(&genpd->sd_count) == 0 ? |
329 | __pm_genpd_save_device(dle, genpd) : -EBUSY; | |
3f241775 RW |
330 | |
331 | if (genpd_abort_poweroff(genpd)) | |
332 | goto out; | |
333 | ||
697a7f37 RW |
334 | if (ret) { |
335 | genpd_set_active(genpd); | |
336 | goto out; | |
337 | } | |
f721889f | 338 | |
c6d22b37 RW |
339 | if (genpd->status == GPD_STATE_REPEAT) { |
340 | genpd->poweroff_task = NULL; | |
341 | goto start; | |
342 | } | |
343 | } | |
17b75eca | 344 | |
3c07cbc4 RW |
345 | if (genpd->power_off) { |
346 | if (atomic_read(&genpd->sd_count) > 0) { | |
347 | ret = -EBUSY; | |
c6d22b37 RW |
348 | goto out; |
349 | } | |
17b75eca | 350 | |
3c07cbc4 RW |
351 | /* |
352 | * If sd_count > 0 at this point, one of the children hasn't | |
353 | * managed to call pm_genpd_poweron() for the parent yet after | |
354 | * incrementing it. In that case pm_genpd_poweron() will wait | |
355 | * for us to drop the lock, so we can call .power_off() and let | |
356 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
357 | * happen very often). | |
358 | */ | |
d2805402 RW |
359 | ret = genpd->power_off(genpd); |
360 | if (ret == -EBUSY) { | |
361 | genpd_set_active(genpd); | |
d2805402 RW |
362 | goto out; |
363 | } | |
364 | } | |
f721889f | 365 | |
17b75eca | 366 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 367 | |
3c07cbc4 RW |
368 | parent = genpd->parent; |
369 | if (parent && genpd_sd_counter_dec(parent)) | |
370 | genpd_queue_power_off_work(parent); | |
f721889f | 371 | |
c6d22b37 RW |
372 | out: |
373 | genpd->poweroff_task = NULL; | |
374 | wake_up_all(&genpd->status_wait_queue); | |
375 | return ret; | |
f721889f RW |
376 | } |
377 | ||
378 | /** | |
379 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
380 | * @work: Work structure used for scheduling the execution of this function. | |
381 | */ | |
382 | static void genpd_power_off_work_fn(struct work_struct *work) | |
383 | { | |
384 | struct generic_pm_domain *genpd; | |
385 | ||
386 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
387 | ||
17b75eca | 388 | genpd_acquire_lock(genpd); |
f721889f | 389 | pm_genpd_poweroff(genpd); |
17b75eca | 390 | genpd_release_lock(genpd); |
f721889f RW |
391 | } |
392 | ||
393 | /** | |
394 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
395 | * @dev: Device to suspend. | |
396 | * | |
397 | * Carry out a runtime suspend of a device under the assumption that its | |
398 | * pm_domain field points to the domain member of an object of type | |
399 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
400 | */ | |
401 | static int pm_genpd_runtime_suspend(struct device *dev) | |
402 | { | |
403 | struct generic_pm_domain *genpd; | |
404 | ||
405 | dev_dbg(dev, "%s()\n", __func__); | |
406 | ||
5248051b RW |
407 | genpd = dev_to_genpd(dev); |
408 | if (IS_ERR(genpd)) | |
f721889f RW |
409 | return -EINVAL; |
410 | ||
f721889f RW |
411 | if (genpd->stop_device) { |
412 | int ret = genpd->stop_device(dev); | |
413 | if (ret) | |
17b75eca | 414 | return ret; |
f721889f | 415 | } |
17b75eca | 416 | |
c6d22b37 | 417 | mutex_lock(&genpd->lock); |
f721889f RW |
418 | genpd->in_progress++; |
419 | pm_genpd_poweroff(genpd); | |
420 | genpd->in_progress--; | |
c6d22b37 | 421 | mutex_unlock(&genpd->lock); |
f721889f RW |
422 | |
423 | return 0; | |
424 | } | |
425 | ||
596ba34b RW |
426 | /** |
427 | * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
428 | * @dev: Device to resume. | |
429 | * @genpd: PM domain the device belongs to. | |
430 | */ | |
431 | static void __pm_genpd_runtime_resume(struct device *dev, | |
432 | struct generic_pm_domain *genpd) | |
433 | { | |
434 | struct dev_list_entry *dle; | |
435 | ||
436 | list_for_each_entry(dle, &genpd->dev_list, node) { | |
437 | if (dle->dev == dev) { | |
438 | __pm_genpd_restore_device(dle, genpd); | |
439 | break; | |
440 | } | |
441 | } | |
596ba34b RW |
442 | } |
443 | ||
f721889f RW |
444 | /** |
445 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
446 | * @dev: Device to resume. | |
447 | * | |
448 | * Carry out a runtime resume of a device under the assumption that its | |
449 | * pm_domain field points to the domain member of an object of type | |
450 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
451 | */ | |
452 | static int pm_genpd_runtime_resume(struct device *dev) | |
453 | { | |
454 | struct generic_pm_domain *genpd; | |
c6d22b37 | 455 | DEFINE_WAIT(wait); |
f721889f RW |
456 | int ret; |
457 | ||
458 | dev_dbg(dev, "%s()\n", __func__); | |
459 | ||
5248051b RW |
460 | genpd = dev_to_genpd(dev); |
461 | if (IS_ERR(genpd)) | |
f721889f RW |
462 | return -EINVAL; |
463 | ||
c6d22b37 | 464 | mutex_lock(&genpd->lock); |
3f241775 RW |
465 | ret = __pm_genpd_poweron(genpd); |
466 | if (ret) { | |
467 | mutex_unlock(&genpd->lock); | |
468 | return ret; | |
469 | } | |
17b75eca | 470 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
471 | genpd->resume_count++; |
472 | for (;;) { | |
473 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
474 | TASK_UNINTERRUPTIBLE); | |
475 | /* | |
476 | * If current is the powering off task, we have been called | |
477 | * reentrantly from one of the device callbacks, so we should | |
478 | * not wait. | |
479 | */ | |
480 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
481 | break; | |
482 | mutex_unlock(&genpd->lock); | |
483 | ||
484 | schedule(); | |
485 | ||
486 | mutex_lock(&genpd->lock); | |
487 | } | |
488 | finish_wait(&genpd->status_wait_queue, &wait); | |
596ba34b | 489 | __pm_genpd_runtime_resume(dev, genpd); |
c6d22b37 RW |
490 | genpd->resume_count--; |
491 | genpd_set_active(genpd); | |
17b75eca | 492 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 493 | mutex_unlock(&genpd->lock); |
17b75eca RW |
494 | |
495 | if (genpd->start_device) | |
496 | genpd->start_device(dev); | |
f721889f RW |
497 | |
498 | return 0; | |
499 | } | |
500 | ||
17f2ae7f RW |
501 | /** |
502 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
503 | */ | |
504 | void pm_genpd_poweroff_unused(void) | |
505 | { | |
506 | struct generic_pm_domain *genpd; | |
507 | ||
508 | mutex_lock(&gpd_list_lock); | |
509 | ||
510 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
511 | genpd_queue_power_off_work(genpd); | |
512 | ||
513 | mutex_unlock(&gpd_list_lock); | |
514 | } | |
515 | ||
f721889f RW |
516 | #else |
517 | ||
518 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
596ba34b RW |
519 | static inline void __pm_genpd_runtime_resume(struct device *dev, |
520 | struct generic_pm_domain *genpd) {} | |
f721889f RW |
521 | |
522 | #define pm_genpd_runtime_suspend NULL | |
523 | #define pm_genpd_runtime_resume NULL | |
524 | ||
525 | #endif /* CONFIG_PM_RUNTIME */ | |
526 | ||
596ba34b RW |
527 | #ifdef CONFIG_PM_SLEEP |
528 | ||
529 | /** | |
530 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. | |
531 | * @genpd: PM domain to power off, if possible. | |
532 | * | |
533 | * Check if the given PM domain can be powered off (during system suspend or | |
534 | * hibernation) and do that if so. Also, in that case propagate to its parent. | |
535 | * | |
536 | * This function is only called in "noirq" stages of system power transitions, | |
537 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
538 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
539 | */ | |
540 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
541 | { | |
542 | struct generic_pm_domain *parent = genpd->parent; | |
543 | ||
17b75eca | 544 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
545 | return; |
546 | ||
c4bb3160 RW |
547 | if (genpd->suspended_count != genpd->device_count |
548 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
549 | return; |
550 | ||
551 | if (genpd->power_off) | |
552 | genpd->power_off(genpd); | |
553 | ||
17b75eca | 554 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
555 | if (parent) { |
556 | genpd_sd_counter_dec(parent); | |
557 | pm_genpd_sync_poweroff(parent); | |
558 | } | |
559 | } | |
560 | ||
4ecd6e65 RW |
561 | /** |
562 | * resume_needed - Check whether to resume a device before system suspend. | |
563 | * @dev: Device to check. | |
564 | * @genpd: PM domain the device belongs to. | |
565 | * | |
566 | * There are two cases in which a device that can wake up the system from sleep | |
567 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
568 | * to wake up the system and it has to remain active for this purpose while the | |
569 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
570 | * the system from sleep states and it generally doesn't generate wakeup signals | |
571 | * by itself (those signals are generated on its behalf by other parts of the | |
572 | * system). In the latter case it may be necessary to reconfigure the device's | |
573 | * wakeup settings during system suspend, because it may have been set up to | |
574 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
575 | * Return 'true' in either of the above cases. | |
576 | */ | |
577 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
578 | { | |
579 | bool active_wakeup; | |
580 | ||
581 | if (!device_can_wakeup(dev)) | |
582 | return false; | |
583 | ||
584 | active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); | |
585 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; | |
586 | } | |
587 | ||
596ba34b RW |
588 | /** |
589 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
590 | * @dev: Device to start the transition of. | |
591 | * | |
592 | * Start a power transition of a device (during a system-wide power transition) | |
593 | * under the assumption that its pm_domain field points to the domain member of | |
594 | * an object of type struct generic_pm_domain representing a PM domain | |
595 | * consisting of I/O devices. | |
596 | */ | |
597 | static int pm_genpd_prepare(struct device *dev) | |
598 | { | |
599 | struct generic_pm_domain *genpd; | |
b6c10c84 | 600 | int ret; |
596ba34b RW |
601 | |
602 | dev_dbg(dev, "%s()\n", __func__); | |
603 | ||
604 | genpd = dev_to_genpd(dev); | |
605 | if (IS_ERR(genpd)) | |
606 | return -EINVAL; | |
607 | ||
17b75eca RW |
608 | /* |
609 | * If a wakeup request is pending for the device, it should be woken up | |
610 | * at this point and a system wakeup event should be reported if it's | |
611 | * set up to wake up the system from sleep states. | |
612 | */ | |
613 | pm_runtime_get_noresume(dev); | |
614 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
615 | pm_wakeup_event(dev, 0); | |
616 | ||
617 | if (pm_wakeup_pending()) { | |
618 | pm_runtime_put_sync(dev); | |
619 | return -EBUSY; | |
620 | } | |
621 | ||
4ecd6e65 RW |
622 | if (resume_needed(dev, genpd)) |
623 | pm_runtime_resume(dev); | |
624 | ||
17b75eca | 625 | genpd_acquire_lock(genpd); |
596ba34b RW |
626 | |
627 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
628 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
629 | ||
630 | genpd_release_lock(genpd); | |
596ba34b RW |
631 | |
632 | if (genpd->suspend_power_off) { | |
17b75eca | 633 | pm_runtime_put_noidle(dev); |
596ba34b RW |
634 | return 0; |
635 | } | |
636 | ||
637 | /* | |
17b75eca RW |
638 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
639 | * so pm_genpd_poweron() will return immediately, but if the device | |
640 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
641 | * to make it operational. | |
596ba34b | 642 | */ |
17b75eca | 643 | pm_runtime_resume(dev); |
596ba34b RW |
644 | __pm_runtime_disable(dev, false); |
645 | ||
b6c10c84 RW |
646 | ret = pm_generic_prepare(dev); |
647 | if (ret) { | |
648 | mutex_lock(&genpd->lock); | |
649 | ||
650 | if (--genpd->prepared_count == 0) | |
651 | genpd->suspend_power_off = false; | |
652 | ||
653 | mutex_unlock(&genpd->lock); | |
17b75eca | 654 | pm_runtime_enable(dev); |
b6c10c84 | 655 | } |
17b75eca RW |
656 | |
657 | pm_runtime_put_sync(dev); | |
b6c10c84 | 658 | return ret; |
596ba34b RW |
659 | } |
660 | ||
661 | /** | |
662 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
663 | * @dev: Device to suspend. | |
664 | * | |
665 | * Suspend a device under the assumption that its pm_domain field points to the | |
666 | * domain member of an object of type struct generic_pm_domain representing | |
667 | * a PM domain consisting of I/O devices. | |
668 | */ | |
669 | static int pm_genpd_suspend(struct device *dev) | |
670 | { | |
671 | struct generic_pm_domain *genpd; | |
672 | ||
673 | dev_dbg(dev, "%s()\n", __func__); | |
674 | ||
675 | genpd = dev_to_genpd(dev); | |
676 | if (IS_ERR(genpd)) | |
677 | return -EINVAL; | |
678 | ||
679 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
680 | } | |
681 | ||
682 | /** | |
683 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
684 | * @dev: Device to suspend. | |
685 | * | |
686 | * Carry out a late suspend of a device under the assumption that its | |
687 | * pm_domain field points to the domain member of an object of type | |
688 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
689 | */ | |
690 | static int pm_genpd_suspend_noirq(struct device *dev) | |
691 | { | |
692 | struct generic_pm_domain *genpd; | |
693 | int ret; | |
694 | ||
695 | dev_dbg(dev, "%s()\n", __func__); | |
696 | ||
697 | genpd = dev_to_genpd(dev); | |
698 | if (IS_ERR(genpd)) | |
699 | return -EINVAL; | |
700 | ||
701 | if (genpd->suspend_power_off) | |
702 | return 0; | |
703 | ||
704 | ret = pm_generic_suspend_noirq(dev); | |
705 | if (ret) | |
706 | return ret; | |
707 | ||
d4f2d87a RW |
708 | if (device_may_wakeup(dev) |
709 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
710 | return 0; | |
711 | ||
596ba34b RW |
712 | if (genpd->stop_device) |
713 | genpd->stop_device(dev); | |
714 | ||
715 | /* | |
716 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
717 | * guaranteed that this function will never run twice in parallel for | |
718 | * the same PM domain, so it is not necessary to use locking here. | |
719 | */ | |
720 | genpd->suspended_count++; | |
721 | pm_genpd_sync_poweroff(genpd); | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | /** | |
727 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
728 | * @dev: Device to resume. | |
729 | * | |
730 | * Carry out an early resume of a device under the assumption that its | |
731 | * pm_domain field points to the domain member of an object of type | |
732 | * struct generic_pm_domain representing a power domain consisting of I/O | |
733 | * devices. | |
734 | */ | |
735 | static int pm_genpd_resume_noirq(struct device *dev) | |
736 | { | |
737 | struct generic_pm_domain *genpd; | |
738 | ||
739 | dev_dbg(dev, "%s()\n", __func__); | |
740 | ||
741 | genpd = dev_to_genpd(dev); | |
742 | if (IS_ERR(genpd)) | |
743 | return -EINVAL; | |
744 | ||
745 | if (genpd->suspend_power_off) | |
746 | return 0; | |
747 | ||
748 | /* | |
749 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
750 | * guaranteed that this function will never run twice in parallel for | |
751 | * the same PM domain, so it is not necessary to use locking here. | |
752 | */ | |
753 | pm_genpd_poweron(genpd); | |
754 | genpd->suspended_count--; | |
755 | if (genpd->start_device) | |
756 | genpd->start_device(dev); | |
757 | ||
758 | return pm_generic_resume_noirq(dev); | |
759 | } | |
760 | ||
761 | /** | |
762 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
763 | * @dev: Device to resume. | |
764 | * | |
765 | * Resume a device under the assumption that its pm_domain field points to the | |
766 | * domain member of an object of type struct generic_pm_domain representing | |
767 | * a power domain consisting of I/O devices. | |
768 | */ | |
769 | static int pm_genpd_resume(struct device *dev) | |
770 | { | |
771 | struct generic_pm_domain *genpd; | |
772 | ||
773 | dev_dbg(dev, "%s()\n", __func__); | |
774 | ||
775 | genpd = dev_to_genpd(dev); | |
776 | if (IS_ERR(genpd)) | |
777 | return -EINVAL; | |
778 | ||
779 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
780 | } | |
781 | ||
782 | /** | |
783 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
784 | * @dev: Device to freeze. | |
785 | * | |
786 | * Freeze a device under the assumption that its pm_domain field points to the | |
787 | * domain member of an object of type struct generic_pm_domain representing | |
788 | * a power domain consisting of I/O devices. | |
789 | */ | |
790 | static int pm_genpd_freeze(struct device *dev) | |
791 | { | |
792 | struct generic_pm_domain *genpd; | |
793 | ||
794 | dev_dbg(dev, "%s()\n", __func__); | |
795 | ||
796 | genpd = dev_to_genpd(dev); | |
797 | if (IS_ERR(genpd)) | |
798 | return -EINVAL; | |
799 | ||
800 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
801 | } | |
802 | ||
803 | /** | |
804 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
805 | * @dev: Device to freeze. | |
806 | * | |
807 | * Carry out a late freeze of a device under the assumption that its | |
808 | * pm_domain field points to the domain member of an object of type | |
809 | * struct generic_pm_domain representing a power domain consisting of I/O | |
810 | * devices. | |
811 | */ | |
812 | static int pm_genpd_freeze_noirq(struct device *dev) | |
813 | { | |
814 | struct generic_pm_domain *genpd; | |
815 | int ret; | |
816 | ||
817 | dev_dbg(dev, "%s()\n", __func__); | |
818 | ||
819 | genpd = dev_to_genpd(dev); | |
820 | if (IS_ERR(genpd)) | |
821 | return -EINVAL; | |
822 | ||
823 | if (genpd->suspend_power_off) | |
824 | return 0; | |
825 | ||
826 | ret = pm_generic_freeze_noirq(dev); | |
827 | if (ret) | |
828 | return ret; | |
829 | ||
830 | if (genpd->stop_device) | |
831 | genpd->stop_device(dev); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | /** | |
837 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
838 | * @dev: Device to thaw. | |
839 | * | |
840 | * Carry out an early thaw of a device under the assumption that its | |
841 | * pm_domain field points to the domain member of an object of type | |
842 | * struct generic_pm_domain representing a power domain consisting of I/O | |
843 | * devices. | |
844 | */ | |
845 | static int pm_genpd_thaw_noirq(struct device *dev) | |
846 | { | |
847 | struct generic_pm_domain *genpd; | |
848 | ||
849 | dev_dbg(dev, "%s()\n", __func__); | |
850 | ||
851 | genpd = dev_to_genpd(dev); | |
852 | if (IS_ERR(genpd)) | |
853 | return -EINVAL; | |
854 | ||
855 | if (genpd->suspend_power_off) | |
856 | return 0; | |
857 | ||
858 | if (genpd->start_device) | |
859 | genpd->start_device(dev); | |
860 | ||
861 | return pm_generic_thaw_noirq(dev); | |
862 | } | |
863 | ||
864 | /** | |
865 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
866 | * @dev: Device to thaw. | |
867 | * | |
868 | * Thaw a device under the assumption that its pm_domain field points to the | |
869 | * domain member of an object of type struct generic_pm_domain representing | |
870 | * a power domain consisting of I/O devices. | |
871 | */ | |
872 | static int pm_genpd_thaw(struct device *dev) | |
873 | { | |
874 | struct generic_pm_domain *genpd; | |
875 | ||
876 | dev_dbg(dev, "%s()\n", __func__); | |
877 | ||
878 | genpd = dev_to_genpd(dev); | |
879 | if (IS_ERR(genpd)) | |
880 | return -EINVAL; | |
881 | ||
882 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
883 | } | |
884 | ||
885 | /** | |
886 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
887 | * @dev: Device to suspend. | |
888 | * | |
889 | * Power off a device under the assumption that its pm_domain field points to | |
890 | * the domain member of an object of type struct generic_pm_domain representing | |
891 | * a PM domain consisting of I/O devices. | |
892 | */ | |
893 | static int pm_genpd_dev_poweroff(struct device *dev) | |
894 | { | |
895 | struct generic_pm_domain *genpd; | |
896 | ||
897 | dev_dbg(dev, "%s()\n", __func__); | |
898 | ||
899 | genpd = dev_to_genpd(dev); | |
900 | if (IS_ERR(genpd)) | |
901 | return -EINVAL; | |
902 | ||
903 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
904 | } | |
905 | ||
906 | /** | |
907 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
908 | * @dev: Device to suspend. | |
909 | * | |
910 | * Carry out a late powering off of a device under the assumption that its | |
911 | * pm_domain field points to the domain member of an object of type | |
912 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
913 | */ | |
914 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
915 | { | |
916 | struct generic_pm_domain *genpd; | |
917 | int ret; | |
918 | ||
919 | dev_dbg(dev, "%s()\n", __func__); | |
920 | ||
921 | genpd = dev_to_genpd(dev); | |
922 | if (IS_ERR(genpd)) | |
923 | return -EINVAL; | |
924 | ||
925 | if (genpd->suspend_power_off) | |
926 | return 0; | |
927 | ||
928 | ret = pm_generic_poweroff_noirq(dev); | |
929 | if (ret) | |
930 | return ret; | |
931 | ||
d4f2d87a RW |
932 | if (device_may_wakeup(dev) |
933 | && genpd->active_wakeup && genpd->active_wakeup(dev)) | |
934 | return 0; | |
935 | ||
596ba34b RW |
936 | if (genpd->stop_device) |
937 | genpd->stop_device(dev); | |
938 | ||
939 | /* | |
940 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
941 | * guaranteed that this function will never run twice in parallel for | |
942 | * the same PM domain, so it is not necessary to use locking here. | |
943 | */ | |
944 | genpd->suspended_count++; | |
945 | pm_genpd_sync_poweroff(genpd); | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
950 | /** | |
951 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
952 | * @dev: Device to resume. | |
953 | * | |
954 | * Carry out an early restore of a device under the assumption that its | |
955 | * pm_domain field points to the domain member of an object of type | |
956 | * struct generic_pm_domain representing a power domain consisting of I/O | |
957 | * devices. | |
958 | */ | |
959 | static int pm_genpd_restore_noirq(struct device *dev) | |
960 | { | |
961 | struct generic_pm_domain *genpd; | |
962 | ||
963 | dev_dbg(dev, "%s()\n", __func__); | |
964 | ||
965 | genpd = dev_to_genpd(dev); | |
966 | if (IS_ERR(genpd)) | |
967 | return -EINVAL; | |
968 | ||
969 | /* | |
970 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
971 | * guaranteed that this function will never run twice in parallel for | |
972 | * the same PM domain, so it is not necessary to use locking here. | |
973 | */ | |
17b75eca | 974 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
975 | if (genpd->suspend_power_off) { |
976 | /* | |
977 | * The boot kernel might put the domain into the power on state, | |
978 | * so make sure it really is powered off. | |
979 | */ | |
980 | if (genpd->power_off) | |
981 | genpd->power_off(genpd); | |
982 | return 0; | |
983 | } | |
984 | ||
985 | pm_genpd_poweron(genpd); | |
986 | genpd->suspended_count--; | |
987 | if (genpd->start_device) | |
988 | genpd->start_device(dev); | |
989 | ||
990 | return pm_generic_restore_noirq(dev); | |
991 | } | |
992 | ||
993 | /** | |
994 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
995 | * @dev: Device to resume. | |
996 | * | |
997 | * Restore a device under the assumption that its pm_domain field points to the | |
998 | * domain member of an object of type struct generic_pm_domain representing | |
999 | * a power domain consisting of I/O devices. | |
1000 | */ | |
1001 | static int pm_genpd_restore(struct device *dev) | |
1002 | { | |
1003 | struct generic_pm_domain *genpd; | |
1004 | ||
1005 | dev_dbg(dev, "%s()\n", __func__); | |
1006 | ||
1007 | genpd = dev_to_genpd(dev); | |
1008 | if (IS_ERR(genpd)) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1016 | * @dev: Device to complete the transition of. | |
1017 | * | |
1018 | * Complete a power transition of a device (during a system-wide power | |
1019 | * transition) under the assumption that its pm_domain field points to the | |
1020 | * domain member of an object of type struct generic_pm_domain representing | |
1021 | * a power domain consisting of I/O devices. | |
1022 | */ | |
1023 | static void pm_genpd_complete(struct device *dev) | |
1024 | { | |
1025 | struct generic_pm_domain *genpd; | |
1026 | bool run_complete; | |
1027 | ||
1028 | dev_dbg(dev, "%s()\n", __func__); | |
1029 | ||
1030 | genpd = dev_to_genpd(dev); | |
1031 | if (IS_ERR(genpd)) | |
1032 | return; | |
1033 | ||
1034 | mutex_lock(&genpd->lock); | |
1035 | ||
1036 | run_complete = !genpd->suspend_power_off; | |
1037 | if (--genpd->prepared_count == 0) | |
1038 | genpd->suspend_power_off = false; | |
1039 | ||
1040 | mutex_unlock(&genpd->lock); | |
1041 | ||
1042 | if (run_complete) { | |
1043 | pm_generic_complete(dev); | |
6f00ff78 | 1044 | pm_runtime_set_active(dev); |
596ba34b | 1045 | pm_runtime_enable(dev); |
6f00ff78 | 1046 | pm_runtime_idle(dev); |
596ba34b RW |
1047 | } |
1048 | } | |
1049 | ||
1050 | #else | |
1051 | ||
1052 | #define pm_genpd_prepare NULL | |
1053 | #define pm_genpd_suspend NULL | |
1054 | #define pm_genpd_suspend_noirq NULL | |
1055 | #define pm_genpd_resume_noirq NULL | |
1056 | #define pm_genpd_resume NULL | |
1057 | #define pm_genpd_freeze NULL | |
1058 | #define pm_genpd_freeze_noirq NULL | |
1059 | #define pm_genpd_thaw_noirq NULL | |
1060 | #define pm_genpd_thaw NULL | |
1061 | #define pm_genpd_dev_poweroff_noirq NULL | |
1062 | #define pm_genpd_dev_poweroff NULL | |
1063 | #define pm_genpd_restore_noirq NULL | |
1064 | #define pm_genpd_restore NULL | |
1065 | #define pm_genpd_complete NULL | |
1066 | ||
1067 | #endif /* CONFIG_PM_SLEEP */ | |
1068 | ||
f721889f RW |
1069 | /** |
1070 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
1071 | * @genpd: PM domain to add the device to. | |
1072 | * @dev: Device to be added. | |
1073 | */ | |
1074 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
1075 | { | |
1076 | struct dev_list_entry *dle; | |
1077 | int ret = 0; | |
1078 | ||
1079 | dev_dbg(dev, "%s()\n", __func__); | |
1080 | ||
1081 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1082 | return -EINVAL; | |
1083 | ||
17b75eca | 1084 | genpd_acquire_lock(genpd); |
f721889f | 1085 | |
17b75eca | 1086 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1087 | ret = -EINVAL; |
1088 | goto out; | |
1089 | } | |
1090 | ||
596ba34b RW |
1091 | if (genpd->prepared_count > 0) { |
1092 | ret = -EAGAIN; | |
1093 | goto out; | |
1094 | } | |
1095 | ||
f721889f RW |
1096 | list_for_each_entry(dle, &genpd->dev_list, node) |
1097 | if (dle->dev == dev) { | |
1098 | ret = -EINVAL; | |
1099 | goto out; | |
1100 | } | |
1101 | ||
1102 | dle = kzalloc(sizeof(*dle), GFP_KERNEL); | |
1103 | if (!dle) { | |
1104 | ret = -ENOMEM; | |
1105 | goto out; | |
1106 | } | |
1107 | ||
1108 | dle->dev = dev; | |
1109 | dle->need_restore = false; | |
1110 | list_add_tail(&dle->node, &genpd->dev_list); | |
596ba34b | 1111 | genpd->device_count++; |
f721889f RW |
1112 | |
1113 | spin_lock_irq(&dev->power.lock); | |
1114 | dev->pm_domain = &genpd->domain; | |
1115 | spin_unlock_irq(&dev->power.lock); | |
1116 | ||
1117 | out: | |
17b75eca | 1118 | genpd_release_lock(genpd); |
f721889f RW |
1119 | |
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | /** | |
1124 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1125 | * @genpd: PM domain to remove the device from. | |
1126 | * @dev: Device to be removed. | |
1127 | */ | |
1128 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1129 | struct device *dev) | |
1130 | { | |
1131 | struct dev_list_entry *dle; | |
1132 | int ret = -EINVAL; | |
1133 | ||
1134 | dev_dbg(dev, "%s()\n", __func__); | |
1135 | ||
1136 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1137 | return -EINVAL; | |
1138 | ||
17b75eca | 1139 | genpd_acquire_lock(genpd); |
f721889f | 1140 | |
596ba34b RW |
1141 | if (genpd->prepared_count > 0) { |
1142 | ret = -EAGAIN; | |
1143 | goto out; | |
1144 | } | |
1145 | ||
f721889f RW |
1146 | list_for_each_entry(dle, &genpd->dev_list, node) { |
1147 | if (dle->dev != dev) | |
1148 | continue; | |
1149 | ||
1150 | spin_lock_irq(&dev->power.lock); | |
1151 | dev->pm_domain = NULL; | |
1152 | spin_unlock_irq(&dev->power.lock); | |
1153 | ||
596ba34b | 1154 | genpd->device_count--; |
f721889f RW |
1155 | list_del(&dle->node); |
1156 | kfree(dle); | |
1157 | ||
1158 | ret = 0; | |
1159 | break; | |
1160 | } | |
1161 | ||
596ba34b | 1162 | out: |
17b75eca | 1163 | genpd_release_lock(genpd); |
f721889f RW |
1164 | |
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1170 | * @genpd: Master PM domain to add the subdomain to. | |
1171 | * @new_subdomain: Subdomain to be added. | |
1172 | */ | |
1173 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1174 | struct generic_pm_domain *new_subdomain) | |
1175 | { | |
1176 | struct generic_pm_domain *subdomain; | |
1177 | int ret = 0; | |
1178 | ||
1179 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) | |
1180 | return -EINVAL; | |
1181 | ||
17b75eca RW |
1182 | start: |
1183 | genpd_acquire_lock(genpd); | |
1184 | mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); | |
f721889f | 1185 | |
17b75eca RW |
1186 | if (new_subdomain->status != GPD_STATE_POWER_OFF |
1187 | && new_subdomain->status != GPD_STATE_ACTIVE) { | |
1188 | mutex_unlock(&new_subdomain->lock); | |
1189 | genpd_release_lock(genpd); | |
1190 | goto start; | |
1191 | } | |
1192 | ||
1193 | if (genpd->status == GPD_STATE_POWER_OFF | |
1194 | && new_subdomain->status != GPD_STATE_POWER_OFF) { | |
f721889f RW |
1195 | ret = -EINVAL; |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1200 | if (subdomain == new_subdomain) { | |
1201 | ret = -EINVAL; | |
1202 | goto out; | |
1203 | } | |
1204 | } | |
1205 | ||
f721889f RW |
1206 | list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); |
1207 | new_subdomain->parent = genpd; | |
17b75eca | 1208 | if (subdomain->status != GPD_STATE_POWER_OFF) |
c4bb3160 | 1209 | genpd_sd_counter_inc(genpd); |
f721889f | 1210 | |
f721889f | 1211 | out: |
17b75eca RW |
1212 | mutex_unlock(&new_subdomain->lock); |
1213 | genpd_release_lock(genpd); | |
f721889f RW |
1214 | |
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | /** | |
1219 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1220 | * @genpd: Master PM domain to remove the subdomain from. | |
1221 | * @target: Subdomain to be removed. | |
1222 | */ | |
1223 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
1224 | struct generic_pm_domain *target) | |
1225 | { | |
1226 | struct generic_pm_domain *subdomain; | |
1227 | int ret = -EINVAL; | |
1228 | ||
1229 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) | |
1230 | return -EINVAL; | |
1231 | ||
17b75eca RW |
1232 | start: |
1233 | genpd_acquire_lock(genpd); | |
f721889f RW |
1234 | |
1235 | list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { | |
1236 | if (subdomain != target) | |
1237 | continue; | |
1238 | ||
1239 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1240 | ||
17b75eca RW |
1241 | if (subdomain->status != GPD_STATE_POWER_OFF |
1242 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1243 | mutex_unlock(&subdomain->lock); | |
1244 | genpd_release_lock(genpd); | |
1245 | goto start; | |
1246 | } | |
1247 | ||
f721889f RW |
1248 | list_del(&subdomain->sd_node); |
1249 | subdomain->parent = NULL; | |
17b75eca | 1250 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1251 | genpd_sd_counter_dec(genpd); |
1252 | ||
1253 | mutex_unlock(&subdomain->lock); | |
1254 | ||
1255 | ret = 0; | |
1256 | break; | |
1257 | } | |
1258 | ||
17b75eca | 1259 | genpd_release_lock(genpd); |
f721889f RW |
1260 | |
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1266 | * @genpd: PM domain object to initialize. | |
1267 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1268 | * @is_off: Initial value of the domain's power_is_off field. | |
1269 | */ | |
1270 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1271 | struct dev_power_governor *gov, bool is_off) | |
1272 | { | |
1273 | if (IS_ERR_OR_NULL(genpd)) | |
1274 | return; | |
1275 | ||
1276 | INIT_LIST_HEAD(&genpd->sd_node); | |
1277 | genpd->parent = NULL; | |
1278 | INIT_LIST_HEAD(&genpd->dev_list); | |
1279 | INIT_LIST_HEAD(&genpd->sd_list); | |
1280 | mutex_init(&genpd->lock); | |
1281 | genpd->gov = gov; | |
1282 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1283 | genpd->in_progress = 0; | |
c4bb3160 | 1284 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1285 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1286 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1287 | genpd->poweroff_task = NULL; |
1288 | genpd->resume_count = 0; | |
596ba34b RW |
1289 | genpd->device_count = 0; |
1290 | genpd->suspended_count = 0; | |
f721889f RW |
1291 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1292 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1293 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1294 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1295 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1296 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1297 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1298 | genpd->domain.ops.resume = pm_genpd_resume; | |
1299 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1300 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1301 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1302 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1303 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1304 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1305 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1306 | genpd->domain.ops.restore = pm_genpd_restore; | |
1307 | genpd->domain.ops.complete = pm_genpd_complete; | |
5125bbf3 RW |
1308 | mutex_lock(&gpd_list_lock); |
1309 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1310 | mutex_unlock(&gpd_list_lock); | |
1311 | } |