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