Commit | Line | Data |
---|---|---|
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 | /** |
5063ce15 | 84 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
85 | * @genpd: PM domain to power up. |
86 | * | |
5063ce15 | 87 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
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 | { |
5063ce15 | 93 | struct gpd_link *link; |
3f241775 | 94 | DEFINE_WAIT(wait); |
5248051b RW |
95 | int ret = 0; |
96 | ||
5063ce15 | 97 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
98 | for (;;) { |
99 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
100 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 101 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
102 | break; |
103 | mutex_unlock(&genpd->lock); | |
17b75eca | 104 | |
3f241775 RW |
105 | schedule(); |
106 | ||
107 | mutex_lock(&genpd->lock); | |
108 | } | |
109 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 110 | |
17b75eca | 111 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 112 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 113 | return 0; |
5248051b | 114 | |
c6d22b37 RW |
115 | if (genpd->status != GPD_STATE_POWER_OFF) { |
116 | genpd_set_active(genpd); | |
3f241775 | 117 | return 0; |
c6d22b37 RW |
118 | } |
119 | ||
5063ce15 RW |
120 | /* |
121 | * The list is guaranteed not to change while the loop below is being | |
122 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
123 | * with it. | |
124 | */ | |
125 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
126 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 127 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 128 | |
5248051b | 129 | mutex_unlock(&genpd->lock); |
5248051b | 130 | |
5063ce15 | 131 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
132 | |
133 | mutex_lock(&genpd->lock); | |
134 | ||
3f241775 RW |
135 | /* |
136 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 137 | * while the master is powering on. |
3f241775 RW |
138 | */ |
139 | genpd->status = GPD_STATE_POWER_OFF; | |
140 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
141 | if (ret) { |
142 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 143 | goto err; |
5063ce15 | 144 | } |
5248051b RW |
145 | } |
146 | ||
9e08cf42 | 147 | if (genpd->power_on) { |
fe202fde | 148 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
149 | if (ret) |
150 | goto err; | |
3c07cbc4 | 151 | } |
5248051b | 152 | |
9e08cf42 RW |
153 | genpd_set_active(genpd); |
154 | ||
3f241775 | 155 | return 0; |
9e08cf42 RW |
156 | |
157 | err: | |
5063ce15 RW |
158 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
159 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 160 | |
3f241775 RW |
161 | return ret; |
162 | } | |
163 | ||
164 | /** | |
5063ce15 | 165 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
166 | * @genpd: PM domain to power up. |
167 | */ | |
168 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
169 | { | |
170 | int ret; | |
171 | ||
172 | mutex_lock(&genpd->lock); | |
173 | ret = __pm_genpd_poweron(genpd); | |
174 | mutex_unlock(&genpd->lock); | |
175 | return ret; | |
5248051b RW |
176 | } |
177 | ||
178 | #endif /* CONFIG_PM */ | |
179 | ||
180 | #ifdef CONFIG_PM_RUNTIME | |
181 | ||
f721889f RW |
182 | /** |
183 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 184 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
185 | * @genpd: PM domain the device belongs to. |
186 | */ | |
4605ab65 | 187 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 188 | struct generic_pm_domain *genpd) |
17b75eca | 189 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 190 | { |
cd0ea672 | 191 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 192 | struct device *dev = pdd->dev; |
f721889f RW |
193 | struct device_driver *drv = dev->driver; |
194 | int ret = 0; | |
195 | ||
cd0ea672 | 196 | if (gpd_data->need_restore) |
f721889f RW |
197 | return 0; |
198 | ||
17b75eca RW |
199 | mutex_unlock(&genpd->lock); |
200 | ||
f721889f RW |
201 | if (drv && drv->pm && drv->pm->runtime_suspend) { |
202 | if (genpd->start_device) | |
203 | genpd->start_device(dev); | |
204 | ||
205 | ret = drv->pm->runtime_suspend(dev); | |
206 | ||
207 | if (genpd->stop_device) | |
208 | genpd->stop_device(dev); | |
209 | } | |
210 | ||
17b75eca RW |
211 | mutex_lock(&genpd->lock); |
212 | ||
f721889f | 213 | if (!ret) |
cd0ea672 | 214 | gpd_data->need_restore = true; |
f721889f RW |
215 | |
216 | return ret; | |
217 | } | |
218 | ||
219 | /** | |
220 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 221 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
222 | * @genpd: PM domain the device belongs to. |
223 | */ | |
4605ab65 | 224 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 225 | struct generic_pm_domain *genpd) |
17b75eca | 226 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 227 | { |
cd0ea672 | 228 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 229 | struct device *dev = pdd->dev; |
f721889f RW |
230 | struct device_driver *drv = dev->driver; |
231 | ||
cd0ea672 | 232 | if (!gpd_data->need_restore) |
f721889f RW |
233 | return; |
234 | ||
17b75eca RW |
235 | mutex_unlock(&genpd->lock); |
236 | ||
f721889f RW |
237 | if (drv && drv->pm && drv->pm->runtime_resume) { |
238 | if (genpd->start_device) | |
239 | genpd->start_device(dev); | |
240 | ||
241 | drv->pm->runtime_resume(dev); | |
242 | ||
243 | if (genpd->stop_device) | |
244 | genpd->stop_device(dev); | |
245 | } | |
246 | ||
17b75eca RW |
247 | mutex_lock(&genpd->lock); |
248 | ||
cd0ea672 | 249 | gpd_data->need_restore = false; |
f721889f RW |
250 | } |
251 | ||
c6d22b37 RW |
252 | /** |
253 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
254 | * @genpd: PM domain to check. | |
255 | * | |
256 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
257 | * a "power off" operation, which means that a "power on" has occured in the | |
258 | * meantime, or if its resume_count field is different from zero, which means | |
259 | * that one of its devices has been resumed in the meantime. | |
260 | */ | |
261 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
262 | { | |
17877eb5 | 263 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 264 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
265 | } |
266 | ||
56375fd4 RW |
267 | /** |
268 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
269 | * @genpd: PM domait to power off. | |
270 | * | |
271 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
272 | * before. | |
273 | */ | |
0bc5b2de | 274 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
275 | { |
276 | if (!work_pending(&genpd->power_off_work)) | |
277 | queue_work(pm_wq, &genpd->power_off_work); | |
278 | } | |
279 | ||
f721889f RW |
280 | /** |
281 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
282 | * @genpd: PM domain to power down. | |
283 | * | |
284 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
285 | * have been powered down, run the runtime suspend callbacks provided by all of | |
286 | * the @genpd's devices' drivers and remove power from @genpd. | |
287 | */ | |
288 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 289 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 290 | { |
4605ab65 | 291 | struct pm_domain_data *pdd; |
5063ce15 | 292 | struct gpd_link *link; |
f721889f | 293 | unsigned int not_suspended; |
c6d22b37 | 294 | int ret = 0; |
f721889f | 295 | |
c6d22b37 RW |
296 | start: |
297 | /* | |
298 | * Do not try to power off the domain in the following situations: | |
299 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 300 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 301 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 302 | * (4) System suspend is in progress. |
c6d22b37 | 303 | */ |
3f241775 | 304 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 305 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 306 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
307 | return 0; |
308 | ||
c4bb3160 | 309 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
310 | return -EBUSY; |
311 | ||
312 | not_suspended = 0; | |
4605ab65 | 313 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 RW |
314 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
315 | || pdd->dev->power.irq_safe)) | |
f721889f RW |
316 | not_suspended++; |
317 | ||
318 | if (not_suspended > genpd->in_progress) | |
319 | return -EBUSY; | |
320 | ||
c6d22b37 RW |
321 | if (genpd->poweroff_task) { |
322 | /* | |
323 | * Another instance of pm_genpd_poweroff() is executing | |
324 | * callbacks, so tell it to start over and return. | |
325 | */ | |
326 | genpd->status = GPD_STATE_REPEAT; | |
327 | return 0; | |
328 | } | |
329 | ||
f721889f RW |
330 | if (genpd->gov && genpd->gov->power_down_ok) { |
331 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
332 | return -EAGAIN; | |
333 | } | |
334 | ||
17b75eca | 335 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 336 | genpd->poweroff_task = current; |
17b75eca | 337 | |
4605ab65 | 338 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 339 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 340 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
341 | |
342 | if (genpd_abort_poweroff(genpd)) | |
343 | goto out; | |
344 | ||
697a7f37 RW |
345 | if (ret) { |
346 | genpd_set_active(genpd); | |
347 | goto out; | |
348 | } | |
f721889f | 349 | |
c6d22b37 RW |
350 | if (genpd->status == GPD_STATE_REPEAT) { |
351 | genpd->poweroff_task = NULL; | |
352 | goto start; | |
353 | } | |
354 | } | |
17b75eca | 355 | |
3c07cbc4 RW |
356 | if (genpd->power_off) { |
357 | if (atomic_read(&genpd->sd_count) > 0) { | |
358 | ret = -EBUSY; | |
c6d22b37 RW |
359 | goto out; |
360 | } | |
17b75eca | 361 | |
3c07cbc4 | 362 | /* |
5063ce15 RW |
363 | * If sd_count > 0 at this point, one of the subdomains hasn't |
364 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
365 | * incrementing it. In that case pm_genpd_poweron() will wait |
366 | * for us to drop the lock, so we can call .power_off() and let | |
367 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
368 | * happen very often). | |
369 | */ | |
d2805402 RW |
370 | ret = genpd->power_off(genpd); |
371 | if (ret == -EBUSY) { | |
372 | genpd_set_active(genpd); | |
d2805402 RW |
373 | goto out; |
374 | } | |
375 | } | |
f721889f | 376 | |
17b75eca | 377 | genpd->status = GPD_STATE_POWER_OFF; |
f721889f | 378 | |
5063ce15 RW |
379 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
380 | genpd_sd_counter_dec(link->master); | |
381 | genpd_queue_power_off_work(link->master); | |
382 | } | |
f721889f | 383 | |
c6d22b37 RW |
384 | out: |
385 | genpd->poweroff_task = NULL; | |
386 | wake_up_all(&genpd->status_wait_queue); | |
387 | return ret; | |
f721889f RW |
388 | } |
389 | ||
390 | /** | |
391 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
392 | * @work: Work structure used for scheduling the execution of this function. | |
393 | */ | |
394 | static void genpd_power_off_work_fn(struct work_struct *work) | |
395 | { | |
396 | struct generic_pm_domain *genpd; | |
397 | ||
398 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
399 | ||
17b75eca | 400 | genpd_acquire_lock(genpd); |
f721889f | 401 | pm_genpd_poweroff(genpd); |
17b75eca | 402 | genpd_release_lock(genpd); |
f721889f RW |
403 | } |
404 | ||
405 | /** | |
406 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
407 | * @dev: Device to suspend. | |
408 | * | |
409 | * Carry out a runtime suspend of a device under the assumption that its | |
410 | * pm_domain field points to the domain member of an object of type | |
411 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
412 | */ | |
413 | static int pm_genpd_runtime_suspend(struct device *dev) | |
414 | { | |
415 | struct generic_pm_domain *genpd; | |
416 | ||
417 | dev_dbg(dev, "%s()\n", __func__); | |
418 | ||
5248051b RW |
419 | genpd = dev_to_genpd(dev); |
420 | if (IS_ERR(genpd)) | |
f721889f RW |
421 | return -EINVAL; |
422 | ||
0aa2a221 RW |
423 | might_sleep_if(!genpd->dev_irq_safe); |
424 | ||
f721889f RW |
425 | if (genpd->stop_device) { |
426 | int ret = genpd->stop_device(dev); | |
427 | if (ret) | |
17b75eca | 428 | return ret; |
f721889f | 429 | } |
17b75eca | 430 | |
0aa2a221 RW |
431 | /* |
432 | * If power.irq_safe is set, this routine will be run with interrupts | |
433 | * off, so it can't use mutexes. | |
434 | */ | |
435 | if (dev->power.irq_safe) | |
436 | return 0; | |
437 | ||
c6d22b37 | 438 | mutex_lock(&genpd->lock); |
f721889f RW |
439 | genpd->in_progress++; |
440 | pm_genpd_poweroff(genpd); | |
441 | genpd->in_progress--; | |
c6d22b37 | 442 | mutex_unlock(&genpd->lock); |
f721889f RW |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
f721889f RW |
447 | /** |
448 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
449 | * @dev: Device to resume. | |
450 | * | |
451 | * Carry out a runtime resume of a device under the assumption that its | |
452 | * pm_domain field points to the domain member of an object of type | |
453 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
454 | */ | |
455 | static int pm_genpd_runtime_resume(struct device *dev) | |
456 | { | |
457 | struct generic_pm_domain *genpd; | |
c6d22b37 | 458 | DEFINE_WAIT(wait); |
f721889f RW |
459 | int ret; |
460 | ||
461 | dev_dbg(dev, "%s()\n", __func__); | |
462 | ||
5248051b RW |
463 | genpd = dev_to_genpd(dev); |
464 | if (IS_ERR(genpd)) | |
f721889f RW |
465 | return -EINVAL; |
466 | ||
0aa2a221 RW |
467 | might_sleep_if(!genpd->dev_irq_safe); |
468 | ||
469 | /* If power.irq_safe, the PM domain is never powered off. */ | |
470 | if (dev->power.irq_safe) | |
471 | goto out; | |
472 | ||
c6d22b37 | 473 | mutex_lock(&genpd->lock); |
3f241775 RW |
474 | ret = __pm_genpd_poweron(genpd); |
475 | if (ret) { | |
476 | mutex_unlock(&genpd->lock); | |
477 | return ret; | |
478 | } | |
17b75eca | 479 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
480 | genpd->resume_count++; |
481 | for (;;) { | |
482 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
483 | TASK_UNINTERRUPTIBLE); | |
484 | /* | |
485 | * If current is the powering off task, we have been called | |
486 | * reentrantly from one of the device callbacks, so we should | |
487 | * not wait. | |
488 | */ | |
489 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
490 | break; | |
491 | mutex_unlock(&genpd->lock); | |
492 | ||
493 | schedule(); | |
494 | ||
495 | mutex_lock(&genpd->lock); | |
496 | } | |
497 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 498 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
499 | genpd->resume_count--; |
500 | genpd_set_active(genpd); | |
17b75eca | 501 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 502 | mutex_unlock(&genpd->lock); |
17b75eca | 503 | |
0aa2a221 | 504 | out: |
17b75eca RW |
505 | if (genpd->start_device) |
506 | genpd->start_device(dev); | |
f721889f RW |
507 | |
508 | return 0; | |
509 | } | |
510 | ||
17f2ae7f RW |
511 | /** |
512 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
513 | */ | |
514 | void pm_genpd_poweroff_unused(void) | |
515 | { | |
516 | struct generic_pm_domain *genpd; | |
517 | ||
518 | mutex_lock(&gpd_list_lock); | |
519 | ||
520 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
521 | genpd_queue_power_off_work(genpd); | |
522 | ||
523 | mutex_unlock(&gpd_list_lock); | |
524 | } | |
525 | ||
f721889f RW |
526 | #else |
527 | ||
528 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
529 | ||
530 | #define pm_genpd_runtime_suspend NULL | |
531 | #define pm_genpd_runtime_resume NULL | |
532 | ||
533 | #endif /* CONFIG_PM_RUNTIME */ | |
534 | ||
596ba34b RW |
535 | #ifdef CONFIG_PM_SLEEP |
536 | ||
537 | /** | |
5063ce15 | 538 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
539 | * @genpd: PM domain to power off, if possible. |
540 | * | |
541 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 542 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
543 | * |
544 | * This function is only called in "noirq" stages of system power transitions, | |
545 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
546 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
547 | */ | |
548 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
549 | { | |
5063ce15 | 550 | struct gpd_link *link; |
596ba34b | 551 | |
17b75eca | 552 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
553 | return; |
554 | ||
c4bb3160 RW |
555 | if (genpd->suspended_count != genpd->device_count |
556 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
557 | return; |
558 | ||
559 | if (genpd->power_off) | |
560 | genpd->power_off(genpd); | |
561 | ||
17b75eca | 562 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
563 | |
564 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
565 | genpd_sd_counter_dec(link->master); | |
566 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
567 | } |
568 | } | |
569 | ||
4ecd6e65 RW |
570 | /** |
571 | * resume_needed - Check whether to resume a device before system suspend. | |
572 | * @dev: Device to check. | |
573 | * @genpd: PM domain the device belongs to. | |
574 | * | |
575 | * There are two cases in which a device that can wake up the system from sleep | |
576 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
577 | * to wake up the system and it has to remain active for this purpose while the | |
578 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
579 | * the system from sleep states and it generally doesn't generate wakeup signals | |
580 | * by itself (those signals are generated on its behalf by other parts of the | |
581 | * system). In the latter case it may be necessary to reconfigure the device's | |
582 | * wakeup settings during system suspend, because it may have been set up to | |
583 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
584 | * Return 'true' in either of the above cases. | |
585 | */ | |
586 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
587 | { | |
588 | bool active_wakeup; | |
589 | ||
590 | if (!device_can_wakeup(dev)) | |
591 | return false; | |
592 | ||
593 | active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); | |
594 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; | |
595 | } | |
596 | ||
596ba34b RW |
597 | /** |
598 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
599 | * @dev: Device to start the transition of. | |
600 | * | |
601 | * Start a power transition of a device (during a system-wide power transition) | |
602 | * under the assumption that its pm_domain field points to the domain member of | |
603 | * an object of type struct generic_pm_domain representing a PM domain | |
604 | * consisting of I/O devices. | |
605 | */ | |
606 | static int pm_genpd_prepare(struct device *dev) | |
607 | { | |
608 | struct generic_pm_domain *genpd; | |
b6c10c84 | 609 | int ret; |
596ba34b RW |
610 | |
611 | dev_dbg(dev, "%s()\n", __func__); | |
612 | ||
613 | genpd = dev_to_genpd(dev); | |
614 | if (IS_ERR(genpd)) | |
615 | return -EINVAL; | |
616 | ||
17b75eca RW |
617 | /* |
618 | * If a wakeup request is pending for the device, it should be woken up | |
619 | * at this point and a system wakeup event should be reported if it's | |
620 | * set up to wake up the system from sleep states. | |
621 | */ | |
622 | pm_runtime_get_noresume(dev); | |
623 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
624 | pm_wakeup_event(dev, 0); | |
625 | ||
626 | if (pm_wakeup_pending()) { | |
627 | pm_runtime_put_sync(dev); | |
628 | return -EBUSY; | |
629 | } | |
630 | ||
4ecd6e65 RW |
631 | if (resume_needed(dev, genpd)) |
632 | pm_runtime_resume(dev); | |
633 | ||
17b75eca | 634 | genpd_acquire_lock(genpd); |
596ba34b RW |
635 | |
636 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
637 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
638 | ||
639 | genpd_release_lock(genpd); | |
596ba34b RW |
640 | |
641 | if (genpd->suspend_power_off) { | |
17b75eca | 642 | pm_runtime_put_noidle(dev); |
596ba34b RW |
643 | return 0; |
644 | } | |
645 | ||
646 | /* | |
17b75eca RW |
647 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
648 | * so pm_genpd_poweron() will return immediately, but if the device | |
649 | * is suspended (e.g. it's been stopped by .stop_device()), we need | |
650 | * to make it operational. | |
596ba34b | 651 | */ |
17b75eca | 652 | pm_runtime_resume(dev); |
596ba34b RW |
653 | __pm_runtime_disable(dev, false); |
654 | ||
b6c10c84 RW |
655 | ret = pm_generic_prepare(dev); |
656 | if (ret) { | |
657 | mutex_lock(&genpd->lock); | |
658 | ||
659 | if (--genpd->prepared_count == 0) | |
660 | genpd->suspend_power_off = false; | |
661 | ||
662 | mutex_unlock(&genpd->lock); | |
17b75eca | 663 | pm_runtime_enable(dev); |
b6c10c84 | 664 | } |
17b75eca RW |
665 | |
666 | pm_runtime_put_sync(dev); | |
b6c10c84 | 667 | return ret; |
596ba34b RW |
668 | } |
669 | ||
670 | /** | |
671 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
672 | * @dev: Device to suspend. | |
673 | * | |
674 | * Suspend a device under the assumption that its pm_domain field points to the | |
675 | * domain member of an object of type struct generic_pm_domain representing | |
676 | * a PM domain consisting of I/O devices. | |
677 | */ | |
678 | static int pm_genpd_suspend(struct device *dev) | |
679 | { | |
680 | struct generic_pm_domain *genpd; | |
681 | ||
682 | dev_dbg(dev, "%s()\n", __func__); | |
683 | ||
684 | genpd = dev_to_genpd(dev); | |
685 | if (IS_ERR(genpd)) | |
686 | return -EINVAL; | |
687 | ||
688 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); | |
689 | } | |
690 | ||
691 | /** | |
692 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
693 | * @dev: Device to suspend. | |
694 | * | |
695 | * Carry out a late suspend of a device under the assumption that its | |
696 | * pm_domain field points to the domain member of an object of type | |
697 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
698 | */ | |
699 | static int pm_genpd_suspend_noirq(struct device *dev) | |
700 | { | |
701 | struct generic_pm_domain *genpd; | |
702 | int ret; | |
703 | ||
704 | dev_dbg(dev, "%s()\n", __func__); | |
705 | ||
706 | genpd = dev_to_genpd(dev); | |
707 | if (IS_ERR(genpd)) | |
708 | return -EINVAL; | |
709 | ||
710 | if (genpd->suspend_power_off) | |
711 | return 0; | |
712 | ||
713 | ret = pm_generic_suspend_noirq(dev); | |
714 | if (ret) | |
715 | return ret; | |
716 | ||
4ca46ff3 | 717 | if (dev->power.wakeup_path |
d4f2d87a RW |
718 | && genpd->active_wakeup && genpd->active_wakeup(dev)) |
719 | return 0; | |
720 | ||
596ba34b RW |
721 | if (genpd->stop_device) |
722 | genpd->stop_device(dev); | |
723 | ||
724 | /* | |
725 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
726 | * guaranteed that this function will never run twice in parallel for | |
727 | * the same PM domain, so it is not necessary to use locking here. | |
728 | */ | |
729 | genpd->suspended_count++; | |
730 | pm_genpd_sync_poweroff(genpd); | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | /** | |
736 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
737 | * @dev: Device to resume. | |
738 | * | |
739 | * Carry out an early resume of a device under the assumption that its | |
740 | * pm_domain field points to the domain member of an object of type | |
741 | * struct generic_pm_domain representing a power domain consisting of I/O | |
742 | * devices. | |
743 | */ | |
744 | static int pm_genpd_resume_noirq(struct device *dev) | |
745 | { | |
746 | struct generic_pm_domain *genpd; | |
747 | ||
748 | dev_dbg(dev, "%s()\n", __func__); | |
749 | ||
750 | genpd = dev_to_genpd(dev); | |
751 | if (IS_ERR(genpd)) | |
752 | return -EINVAL; | |
753 | ||
754 | if (genpd->suspend_power_off) | |
755 | return 0; | |
756 | ||
757 | /* | |
758 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
759 | * guaranteed that this function will never run twice in parallel for | |
760 | * the same PM domain, so it is not necessary to use locking here. | |
761 | */ | |
762 | pm_genpd_poweron(genpd); | |
763 | genpd->suspended_count--; | |
764 | if (genpd->start_device) | |
765 | genpd->start_device(dev); | |
766 | ||
767 | return pm_generic_resume_noirq(dev); | |
768 | } | |
769 | ||
770 | /** | |
771 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
772 | * @dev: Device to resume. | |
773 | * | |
774 | * Resume a device under the assumption that its pm_domain field points to the | |
775 | * domain member of an object of type struct generic_pm_domain representing | |
776 | * a power domain consisting of I/O devices. | |
777 | */ | |
778 | static int pm_genpd_resume(struct device *dev) | |
779 | { | |
780 | struct generic_pm_domain *genpd; | |
781 | ||
782 | dev_dbg(dev, "%s()\n", __func__); | |
783 | ||
784 | genpd = dev_to_genpd(dev); | |
785 | if (IS_ERR(genpd)) | |
786 | return -EINVAL; | |
787 | ||
788 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); | |
789 | } | |
790 | ||
791 | /** | |
792 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
793 | * @dev: Device to freeze. | |
794 | * | |
795 | * Freeze a device under the assumption that its pm_domain field points to the | |
796 | * domain member of an object of type struct generic_pm_domain representing | |
797 | * a power domain consisting of I/O devices. | |
798 | */ | |
799 | static int pm_genpd_freeze(struct device *dev) | |
800 | { | |
801 | struct generic_pm_domain *genpd; | |
802 | ||
803 | dev_dbg(dev, "%s()\n", __func__); | |
804 | ||
805 | genpd = dev_to_genpd(dev); | |
806 | if (IS_ERR(genpd)) | |
807 | return -EINVAL; | |
808 | ||
809 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); | |
810 | } | |
811 | ||
812 | /** | |
813 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
814 | * @dev: Device to freeze. | |
815 | * | |
816 | * Carry out a late freeze of a device under the assumption that its | |
817 | * pm_domain field points to the domain member of an object of type | |
818 | * struct generic_pm_domain representing a power domain consisting of I/O | |
819 | * devices. | |
820 | */ | |
821 | static int pm_genpd_freeze_noirq(struct device *dev) | |
822 | { | |
823 | struct generic_pm_domain *genpd; | |
824 | int ret; | |
825 | ||
826 | dev_dbg(dev, "%s()\n", __func__); | |
827 | ||
828 | genpd = dev_to_genpd(dev); | |
829 | if (IS_ERR(genpd)) | |
830 | return -EINVAL; | |
831 | ||
832 | if (genpd->suspend_power_off) | |
833 | return 0; | |
834 | ||
835 | ret = pm_generic_freeze_noirq(dev); | |
836 | if (ret) | |
837 | return ret; | |
838 | ||
839 | if (genpd->stop_device) | |
840 | genpd->stop_device(dev); | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | /** | |
846 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
847 | * @dev: Device to thaw. | |
848 | * | |
849 | * Carry out an early thaw of a device under the assumption that its | |
850 | * pm_domain field points to the domain member of an object of type | |
851 | * struct generic_pm_domain representing a power domain consisting of I/O | |
852 | * devices. | |
853 | */ | |
854 | static int pm_genpd_thaw_noirq(struct device *dev) | |
855 | { | |
856 | struct generic_pm_domain *genpd; | |
857 | ||
858 | dev_dbg(dev, "%s()\n", __func__); | |
859 | ||
860 | genpd = dev_to_genpd(dev); | |
861 | if (IS_ERR(genpd)) | |
862 | return -EINVAL; | |
863 | ||
864 | if (genpd->suspend_power_off) | |
865 | return 0; | |
866 | ||
867 | if (genpd->start_device) | |
868 | genpd->start_device(dev); | |
869 | ||
870 | return pm_generic_thaw_noirq(dev); | |
871 | } | |
872 | ||
873 | /** | |
874 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
875 | * @dev: Device to thaw. | |
876 | * | |
877 | * Thaw a device under the assumption that its pm_domain field points to the | |
878 | * domain member of an object of type struct generic_pm_domain representing | |
879 | * a power domain consisting of I/O devices. | |
880 | */ | |
881 | static int pm_genpd_thaw(struct device *dev) | |
882 | { | |
883 | struct generic_pm_domain *genpd; | |
884 | ||
885 | dev_dbg(dev, "%s()\n", __func__); | |
886 | ||
887 | genpd = dev_to_genpd(dev); | |
888 | if (IS_ERR(genpd)) | |
889 | return -EINVAL; | |
890 | ||
891 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); | |
892 | } | |
893 | ||
894 | /** | |
895 | * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. | |
896 | * @dev: Device to suspend. | |
897 | * | |
898 | * Power off a device under the assumption that its pm_domain field points to | |
899 | * the domain member of an object of type struct generic_pm_domain representing | |
900 | * a PM domain consisting of I/O devices. | |
901 | */ | |
902 | static int pm_genpd_dev_poweroff(struct device *dev) | |
903 | { | |
904 | struct generic_pm_domain *genpd; | |
905 | ||
906 | dev_dbg(dev, "%s()\n", __func__); | |
907 | ||
908 | genpd = dev_to_genpd(dev); | |
909 | if (IS_ERR(genpd)) | |
910 | return -EINVAL; | |
911 | ||
912 | return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); | |
913 | } | |
914 | ||
915 | /** | |
916 | * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. | |
917 | * @dev: Device to suspend. | |
918 | * | |
919 | * Carry out a late powering off of a device under the assumption that its | |
920 | * pm_domain field points to the domain member of an object of type | |
921 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
922 | */ | |
923 | static int pm_genpd_dev_poweroff_noirq(struct device *dev) | |
924 | { | |
925 | struct generic_pm_domain *genpd; | |
926 | int ret; | |
927 | ||
928 | dev_dbg(dev, "%s()\n", __func__); | |
929 | ||
930 | genpd = dev_to_genpd(dev); | |
931 | if (IS_ERR(genpd)) | |
932 | return -EINVAL; | |
933 | ||
934 | if (genpd->suspend_power_off) | |
935 | return 0; | |
936 | ||
937 | ret = pm_generic_poweroff_noirq(dev); | |
938 | if (ret) | |
939 | return ret; | |
940 | ||
4ca46ff3 | 941 | if (dev->power.wakeup_path |
d4f2d87a RW |
942 | && genpd->active_wakeup && genpd->active_wakeup(dev)) |
943 | return 0; | |
944 | ||
596ba34b RW |
945 | if (genpd->stop_device) |
946 | genpd->stop_device(dev); | |
947 | ||
948 | /* | |
949 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
950 | * guaranteed that this function will never run twice in parallel for | |
951 | * the same PM domain, so it is not necessary to use locking here. | |
952 | */ | |
953 | genpd->suspended_count++; | |
954 | pm_genpd_sync_poweroff(genpd); | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | /** | |
960 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
961 | * @dev: Device to resume. | |
962 | * | |
963 | * Carry out an early restore of a device under the assumption that its | |
964 | * pm_domain field points to the domain member of an object of type | |
965 | * struct generic_pm_domain representing a power domain consisting of I/O | |
966 | * devices. | |
967 | */ | |
968 | static int pm_genpd_restore_noirq(struct device *dev) | |
969 | { | |
970 | struct generic_pm_domain *genpd; | |
971 | ||
972 | dev_dbg(dev, "%s()\n", __func__); | |
973 | ||
974 | genpd = dev_to_genpd(dev); | |
975 | if (IS_ERR(genpd)) | |
976 | return -EINVAL; | |
977 | ||
978 | /* | |
979 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
980 | * guaranteed that this function will never run twice in parallel for | |
981 | * the same PM domain, so it is not necessary to use locking here. | |
982 | */ | |
17b75eca | 983 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
984 | if (genpd->suspend_power_off) { |
985 | /* | |
986 | * The boot kernel might put the domain into the power on state, | |
987 | * so make sure it really is powered off. | |
988 | */ | |
989 | if (genpd->power_off) | |
990 | genpd->power_off(genpd); | |
991 | return 0; | |
992 | } | |
993 | ||
994 | pm_genpd_poweron(genpd); | |
995 | genpd->suspended_count--; | |
996 | if (genpd->start_device) | |
997 | genpd->start_device(dev); | |
998 | ||
999 | return pm_generic_restore_noirq(dev); | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * pm_genpd_restore - Restore a device belonging to an I/O power domain. | |
1004 | * @dev: Device to resume. | |
1005 | * | |
1006 | * Restore a device under the assumption that its pm_domain field points to the | |
1007 | * domain member of an object of type struct generic_pm_domain representing | |
1008 | * a power domain consisting of I/O devices. | |
1009 | */ | |
1010 | static int pm_genpd_restore(struct device *dev) | |
1011 | { | |
1012 | struct generic_pm_domain *genpd; | |
1013 | ||
1014 | dev_dbg(dev, "%s()\n", __func__); | |
1015 | ||
1016 | genpd = dev_to_genpd(dev); | |
1017 | if (IS_ERR(genpd)) | |
1018 | return -EINVAL; | |
1019 | ||
1020 | return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); | |
1021 | } | |
1022 | ||
1023 | /** | |
1024 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1025 | * @dev: Device to complete the transition of. | |
1026 | * | |
1027 | * Complete a power transition of a device (during a system-wide power | |
1028 | * transition) under the assumption that its pm_domain field points to the | |
1029 | * domain member of an object of type struct generic_pm_domain representing | |
1030 | * a power domain consisting of I/O devices. | |
1031 | */ | |
1032 | static void pm_genpd_complete(struct device *dev) | |
1033 | { | |
1034 | struct generic_pm_domain *genpd; | |
1035 | bool run_complete; | |
1036 | ||
1037 | dev_dbg(dev, "%s()\n", __func__); | |
1038 | ||
1039 | genpd = dev_to_genpd(dev); | |
1040 | if (IS_ERR(genpd)) | |
1041 | return; | |
1042 | ||
1043 | mutex_lock(&genpd->lock); | |
1044 | ||
1045 | run_complete = !genpd->suspend_power_off; | |
1046 | if (--genpd->prepared_count == 0) | |
1047 | genpd->suspend_power_off = false; | |
1048 | ||
1049 | mutex_unlock(&genpd->lock); | |
1050 | ||
1051 | if (run_complete) { | |
1052 | pm_generic_complete(dev); | |
6f00ff78 | 1053 | pm_runtime_set_active(dev); |
596ba34b | 1054 | pm_runtime_enable(dev); |
6f00ff78 | 1055 | pm_runtime_idle(dev); |
596ba34b RW |
1056 | } |
1057 | } | |
1058 | ||
1059 | #else | |
1060 | ||
1061 | #define pm_genpd_prepare NULL | |
1062 | #define pm_genpd_suspend NULL | |
1063 | #define pm_genpd_suspend_noirq NULL | |
1064 | #define pm_genpd_resume_noirq NULL | |
1065 | #define pm_genpd_resume NULL | |
1066 | #define pm_genpd_freeze NULL | |
1067 | #define pm_genpd_freeze_noirq NULL | |
1068 | #define pm_genpd_thaw_noirq NULL | |
1069 | #define pm_genpd_thaw NULL | |
1070 | #define pm_genpd_dev_poweroff_noirq NULL | |
1071 | #define pm_genpd_dev_poweroff NULL | |
1072 | #define pm_genpd_restore_noirq NULL | |
1073 | #define pm_genpd_restore NULL | |
1074 | #define pm_genpd_complete NULL | |
1075 | ||
1076 | #endif /* CONFIG_PM_SLEEP */ | |
1077 | ||
f721889f RW |
1078 | /** |
1079 | * pm_genpd_add_device - Add a device to an I/O PM domain. | |
1080 | * @genpd: PM domain to add the device to. | |
1081 | * @dev: Device to be added. | |
1082 | */ | |
1083 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) | |
1084 | { | |
cd0ea672 | 1085 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1086 | struct pm_domain_data *pdd; |
f721889f RW |
1087 | int ret = 0; |
1088 | ||
1089 | dev_dbg(dev, "%s()\n", __func__); | |
1090 | ||
1091 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1092 | return -EINVAL; | |
1093 | ||
17b75eca | 1094 | genpd_acquire_lock(genpd); |
f721889f | 1095 | |
17b75eca | 1096 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1097 | ret = -EINVAL; |
1098 | goto out; | |
1099 | } | |
1100 | ||
596ba34b RW |
1101 | if (genpd->prepared_count > 0) { |
1102 | ret = -EAGAIN; | |
1103 | goto out; | |
1104 | } | |
1105 | ||
4605ab65 RW |
1106 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1107 | if (pdd->dev == dev) { | |
f721889f RW |
1108 | ret = -EINVAL; |
1109 | goto out; | |
1110 | } | |
1111 | ||
cd0ea672 RW |
1112 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1113 | if (!gpd_data) { | |
1114 | ret = -ENOMEM; | |
1115 | goto out; | |
1116 | } | |
1117 | ||
596ba34b | 1118 | genpd->device_count++; |
f721889f | 1119 | |
f721889f | 1120 | dev->pm_domain = &genpd->domain; |
4605ab65 | 1121 | dev_pm_get_subsys_data(dev); |
cd0ea672 RW |
1122 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1123 | gpd_data->base.dev = dev; | |
1124 | gpd_data->need_restore = false; | |
1125 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
f721889f RW |
1126 | |
1127 | out: | |
17b75eca | 1128 | genpd_release_lock(genpd); |
f721889f RW |
1129 | |
1130 | return ret; | |
1131 | } | |
1132 | ||
1133 | /** | |
1134 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1135 | * @genpd: PM domain to remove the device from. | |
1136 | * @dev: Device to be removed. | |
1137 | */ | |
1138 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1139 | struct device *dev) | |
1140 | { | |
4605ab65 | 1141 | struct pm_domain_data *pdd; |
f721889f RW |
1142 | int ret = -EINVAL; |
1143 | ||
1144 | dev_dbg(dev, "%s()\n", __func__); | |
1145 | ||
1146 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1147 | return -EINVAL; | |
1148 | ||
17b75eca | 1149 | genpd_acquire_lock(genpd); |
f721889f | 1150 | |
596ba34b RW |
1151 | if (genpd->prepared_count > 0) { |
1152 | ret = -EAGAIN; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
4605ab65 RW |
1156 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1157 | if (pdd->dev != dev) | |
f721889f RW |
1158 | continue; |
1159 | ||
4605ab65 RW |
1160 | list_del_init(&pdd->list_node); |
1161 | pdd->dev = NULL; | |
1162 | dev_pm_put_subsys_data(dev); | |
f721889f | 1163 | dev->pm_domain = NULL; |
cd0ea672 | 1164 | kfree(to_gpd_data(pdd)); |
f721889f | 1165 | |
596ba34b | 1166 | genpd->device_count--; |
f721889f RW |
1167 | |
1168 | ret = 0; | |
1169 | break; | |
1170 | } | |
1171 | ||
596ba34b | 1172 | out: |
17b75eca | 1173 | genpd_release_lock(genpd); |
f721889f RW |
1174 | |
1175 | return ret; | |
1176 | } | |
1177 | ||
1178 | /** | |
1179 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1180 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1181 | * @subdomain: Subdomain to be added. |
f721889f RW |
1182 | */ |
1183 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1184 | struct generic_pm_domain *subdomain) |
f721889f | 1185 | { |
5063ce15 | 1186 | struct gpd_link *link; |
f721889f RW |
1187 | int ret = 0; |
1188 | ||
bc0403ff | 1189 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1190 | return -EINVAL; |
1191 | ||
17b75eca RW |
1192 | start: |
1193 | genpd_acquire_lock(genpd); | |
bc0403ff | 1194 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1195 | |
bc0403ff RW |
1196 | if (subdomain->status != GPD_STATE_POWER_OFF |
1197 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1198 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1199 | genpd_release_lock(genpd); |
1200 | goto start; | |
1201 | } | |
1202 | ||
1203 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1204 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1205 | ret = -EINVAL; |
1206 | goto out; | |
1207 | } | |
1208 | ||
5063ce15 | 1209 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
bc0403ff | 1210 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1211 | ret = -EINVAL; |
1212 | goto out; | |
1213 | } | |
1214 | } | |
1215 | ||
5063ce15 RW |
1216 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1217 | if (!link) { | |
1218 | ret = -ENOMEM; | |
1219 | goto out; | |
1220 | } | |
1221 | link->master = genpd; | |
1222 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1223 | link->slave = subdomain; |
1224 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1225 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1226 | genpd_sd_counter_inc(genpd); |
f721889f | 1227 | |
f721889f | 1228 | out: |
bc0403ff | 1229 | mutex_unlock(&subdomain->lock); |
17b75eca | 1230 | genpd_release_lock(genpd); |
f721889f RW |
1231 | |
1232 | return ret; | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1237 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1238 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1239 | */ |
1240 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1241 | struct generic_pm_domain *subdomain) |
f721889f | 1242 | { |
5063ce15 | 1243 | struct gpd_link *link; |
f721889f RW |
1244 | int ret = -EINVAL; |
1245 | ||
5063ce15 | 1246 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1247 | return -EINVAL; |
1248 | ||
17b75eca RW |
1249 | start: |
1250 | genpd_acquire_lock(genpd); | |
f721889f | 1251 | |
5063ce15 RW |
1252 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1253 | if (link->slave != subdomain) | |
f721889f RW |
1254 | continue; |
1255 | ||
1256 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1257 | ||
17b75eca RW |
1258 | if (subdomain->status != GPD_STATE_POWER_OFF |
1259 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1260 | mutex_unlock(&subdomain->lock); | |
1261 | genpd_release_lock(genpd); | |
1262 | goto start; | |
1263 | } | |
1264 | ||
5063ce15 RW |
1265 | list_del(&link->master_node); |
1266 | list_del(&link->slave_node); | |
1267 | kfree(link); | |
17b75eca | 1268 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1269 | genpd_sd_counter_dec(genpd); |
1270 | ||
1271 | mutex_unlock(&subdomain->lock); | |
1272 | ||
1273 | ret = 0; | |
1274 | break; | |
1275 | } | |
1276 | ||
17b75eca | 1277 | genpd_release_lock(genpd); |
f721889f RW |
1278 | |
1279 | return ret; | |
1280 | } | |
1281 | ||
1282 | /** | |
1283 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1284 | * @genpd: PM domain object to initialize. | |
1285 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1286 | * @is_off: Initial value of the domain's power_is_off field. | |
1287 | */ | |
1288 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1289 | struct dev_power_governor *gov, bool is_off) | |
1290 | { | |
1291 | if (IS_ERR_OR_NULL(genpd)) | |
1292 | return; | |
1293 | ||
5063ce15 RW |
1294 | INIT_LIST_HEAD(&genpd->master_links); |
1295 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1296 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1297 | mutex_init(&genpd->lock); |
1298 | genpd->gov = gov; | |
1299 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1300 | genpd->in_progress = 0; | |
c4bb3160 | 1301 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1302 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1303 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1304 | genpd->poweroff_task = NULL; |
1305 | genpd->resume_count = 0; | |
596ba34b RW |
1306 | genpd->device_count = 0; |
1307 | genpd->suspended_count = 0; | |
f721889f RW |
1308 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1309 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1310 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1311 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1312 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1313 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1314 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1315 | genpd->domain.ops.resume = pm_genpd_resume; | |
1316 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1317 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1318 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1319 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
1320 | genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; | |
1321 | genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; | |
1322 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; | |
1323 | genpd->domain.ops.restore = pm_genpd_restore; | |
1324 | genpd->domain.ops.complete = pm_genpd_complete; | |
5125bbf3 RW |
1325 | mutex_lock(&gpd_list_lock); |
1326 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1327 | mutex_unlock(&gpd_list_lock); | |
1328 | } |