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> | |
d5e4cbfe RW |
18 | #include <linux/export.h> |
19 | ||
20 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
21 | ({ \ | |
22 | type (*__routine)(struct device *__d); \ | |
23 | type __ret = (type)0; \ | |
24 | \ | |
25 | __routine = genpd->dev_ops.callback; \ | |
26 | if (__routine) { \ | |
27 | __ret = __routine(dev); \ | |
28 | } else { \ | |
29 | __routine = dev_gpd_data(dev)->ops.callback; \ | |
30 | if (__routine) \ | |
31 | __ret = __routine(dev); \ | |
32 | } \ | |
33 | __ret; \ | |
34 | }) | |
f721889f | 35 | |
5125bbf3 RW |
36 | static LIST_HEAD(gpd_list); |
37 | static DEFINE_MUTEX(gpd_list_lock); | |
38 | ||
5248051b RW |
39 | #ifdef CONFIG_PM |
40 | ||
b02c999a | 41 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
42 | { |
43 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
44 | return ERR_PTR(-EINVAL); | |
45 | ||
596ba34b | 46 | return pd_to_genpd(dev->pm_domain); |
5248051b | 47 | } |
f721889f | 48 | |
d5e4cbfe RW |
49 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
50 | { | |
51 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); | |
52 | } | |
53 | ||
54 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
55 | { | |
56 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
57 | } | |
58 | ||
ecf00475 RW |
59 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
60 | { | |
61 | return GENPD_DEV_CALLBACK(genpd, int, save_state, dev); | |
62 | } | |
63 | ||
64 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
65 | { | |
66 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); | |
67 | } | |
68 | ||
c4bb3160 | 69 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 70 | { |
c4bb3160 RW |
71 | bool ret = false; |
72 | ||
73 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
74 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
80 | { | |
81 | atomic_inc(&genpd->sd_count); | |
82 | smp_mb__after_atomic_inc(); | |
f721889f RW |
83 | } |
84 | ||
17b75eca RW |
85 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
86 | { | |
87 | DEFINE_WAIT(wait); | |
88 | ||
89 | mutex_lock(&genpd->lock); | |
90 | /* | |
91 | * Wait for the domain to transition into either the active, | |
92 | * or the power off state. | |
93 | */ | |
94 | for (;;) { | |
95 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
96 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
97 | if (genpd->status == GPD_STATE_ACTIVE |
98 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
99 | break; |
100 | mutex_unlock(&genpd->lock); | |
101 | ||
102 | schedule(); | |
103 | ||
104 | mutex_lock(&genpd->lock); | |
105 | } | |
106 | finish_wait(&genpd->status_wait_queue, &wait); | |
107 | } | |
108 | ||
109 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
110 | { | |
111 | mutex_unlock(&genpd->lock); | |
112 | } | |
113 | ||
c6d22b37 RW |
114 | static void genpd_set_active(struct generic_pm_domain *genpd) |
115 | { | |
116 | if (genpd->resume_count == 0) | |
117 | genpd->status = GPD_STATE_ACTIVE; | |
118 | } | |
119 | ||
5248051b | 120 | /** |
5063ce15 | 121 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
122 | * @genpd: PM domain to power up. |
123 | * | |
5063ce15 | 124 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
125 | * resume a device belonging to it. |
126 | */ | |
3f241775 RW |
127 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
128 | __releases(&genpd->lock) __acquires(&genpd->lock) | |
5248051b | 129 | { |
5063ce15 | 130 | struct gpd_link *link; |
3f241775 | 131 | DEFINE_WAIT(wait); |
5248051b RW |
132 | int ret = 0; |
133 | ||
5063ce15 | 134 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
135 | for (;;) { |
136 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
137 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 138 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
139 | break; |
140 | mutex_unlock(&genpd->lock); | |
17b75eca | 141 | |
3f241775 RW |
142 | schedule(); |
143 | ||
144 | mutex_lock(&genpd->lock); | |
145 | } | |
146 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 147 | |
17b75eca | 148 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 149 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 150 | return 0; |
5248051b | 151 | |
c6d22b37 RW |
152 | if (genpd->status != GPD_STATE_POWER_OFF) { |
153 | genpd_set_active(genpd); | |
3f241775 | 154 | return 0; |
c6d22b37 RW |
155 | } |
156 | ||
5063ce15 RW |
157 | /* |
158 | * The list is guaranteed not to change while the loop below is being | |
159 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
160 | * with it. | |
161 | */ | |
162 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
163 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 164 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 165 | |
5248051b | 166 | mutex_unlock(&genpd->lock); |
5248051b | 167 | |
5063ce15 | 168 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
169 | |
170 | mutex_lock(&genpd->lock); | |
171 | ||
3f241775 RW |
172 | /* |
173 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 174 | * while the master is powering on. |
3f241775 RW |
175 | */ |
176 | genpd->status = GPD_STATE_POWER_OFF; | |
177 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
178 | if (ret) { |
179 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 180 | goto err; |
5063ce15 | 181 | } |
5248051b RW |
182 | } |
183 | ||
9e08cf42 | 184 | if (genpd->power_on) { |
fe202fde | 185 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
186 | if (ret) |
187 | goto err; | |
3c07cbc4 | 188 | } |
5248051b | 189 | |
9e08cf42 RW |
190 | genpd_set_active(genpd); |
191 | ||
3f241775 | 192 | return 0; |
9e08cf42 RW |
193 | |
194 | err: | |
5063ce15 RW |
195 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
196 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 197 | |
3f241775 RW |
198 | return ret; |
199 | } | |
200 | ||
201 | /** | |
5063ce15 | 202 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
203 | * @genpd: PM domain to power up. |
204 | */ | |
205 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
206 | { | |
207 | int ret; | |
208 | ||
209 | mutex_lock(&genpd->lock); | |
210 | ret = __pm_genpd_poweron(genpd); | |
211 | mutex_unlock(&genpd->lock); | |
212 | return ret; | |
5248051b RW |
213 | } |
214 | ||
215 | #endif /* CONFIG_PM */ | |
216 | ||
217 | #ifdef CONFIG_PM_RUNTIME | |
218 | ||
f721889f RW |
219 | /** |
220 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 221 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
222 | * @genpd: PM domain the device belongs to. |
223 | */ | |
4605ab65 | 224 | static int __pm_genpd_save_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 | int ret = 0; |
231 | ||
cd0ea672 | 232 | if (gpd_data->need_restore) |
f721889f RW |
233 | return 0; |
234 | ||
17b75eca RW |
235 | mutex_unlock(&genpd->lock); |
236 | ||
ecf00475 RW |
237 | genpd_start_dev(genpd, dev); |
238 | ret = genpd_save_dev(genpd, dev); | |
239 | genpd_stop_dev(genpd, dev); | |
f721889f | 240 | |
17b75eca RW |
241 | mutex_lock(&genpd->lock); |
242 | ||
f721889f | 243 | if (!ret) |
cd0ea672 | 244 | gpd_data->need_restore = true; |
f721889f RW |
245 | |
246 | return ret; | |
247 | } | |
248 | ||
249 | /** | |
250 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 251 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
252 | * @genpd: PM domain the device belongs to. |
253 | */ | |
4605ab65 | 254 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 255 | struct generic_pm_domain *genpd) |
17b75eca | 256 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 257 | { |
cd0ea672 | 258 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 259 | struct device *dev = pdd->dev; |
f721889f | 260 | |
cd0ea672 | 261 | if (!gpd_data->need_restore) |
f721889f RW |
262 | return; |
263 | ||
17b75eca RW |
264 | mutex_unlock(&genpd->lock); |
265 | ||
ecf00475 RW |
266 | genpd_start_dev(genpd, dev); |
267 | genpd_restore_dev(genpd, dev); | |
268 | genpd_stop_dev(genpd, dev); | |
f721889f | 269 | |
17b75eca RW |
270 | mutex_lock(&genpd->lock); |
271 | ||
cd0ea672 | 272 | gpd_data->need_restore = false; |
f721889f RW |
273 | } |
274 | ||
c6d22b37 RW |
275 | /** |
276 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
277 | * @genpd: PM domain to check. | |
278 | * | |
279 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
280 | * a "power off" operation, which means that a "power on" has occured in the | |
281 | * meantime, or if its resume_count field is different from zero, which means | |
282 | * that one of its devices has been resumed in the meantime. | |
283 | */ | |
284 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
285 | { | |
17877eb5 | 286 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 287 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
288 | } |
289 | ||
56375fd4 RW |
290 | /** |
291 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
292 | * @genpd: PM domait to power off. | |
293 | * | |
294 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
295 | * before. | |
296 | */ | |
0bc5b2de | 297 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
298 | { |
299 | if (!work_pending(&genpd->power_off_work)) | |
300 | queue_work(pm_wq, &genpd->power_off_work); | |
301 | } | |
302 | ||
f721889f RW |
303 | /** |
304 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
305 | * @genpd: PM domain to power down. | |
306 | * | |
307 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
308 | * have been powered down, run the runtime suspend callbacks provided by all of | |
309 | * the @genpd's devices' drivers and remove power from @genpd. | |
310 | */ | |
311 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 312 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 313 | { |
4605ab65 | 314 | struct pm_domain_data *pdd; |
5063ce15 | 315 | struct gpd_link *link; |
f721889f | 316 | unsigned int not_suspended; |
c6d22b37 | 317 | int ret = 0; |
f721889f | 318 | |
c6d22b37 RW |
319 | start: |
320 | /* | |
321 | * Do not try to power off the domain in the following situations: | |
322 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 323 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 324 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 325 | * (4) System suspend is in progress. |
c6d22b37 | 326 | */ |
3f241775 | 327 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 328 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 329 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
330 | return 0; |
331 | ||
c4bb3160 | 332 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
333 | return -EBUSY; |
334 | ||
335 | not_suspended = 0; | |
4605ab65 | 336 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 RW |
337 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
338 | || pdd->dev->power.irq_safe)) | |
f721889f RW |
339 | not_suspended++; |
340 | ||
341 | if (not_suspended > genpd->in_progress) | |
342 | return -EBUSY; | |
343 | ||
c6d22b37 RW |
344 | if (genpd->poweroff_task) { |
345 | /* | |
346 | * Another instance of pm_genpd_poweroff() is executing | |
347 | * callbacks, so tell it to start over and return. | |
348 | */ | |
349 | genpd->status = GPD_STATE_REPEAT; | |
350 | return 0; | |
351 | } | |
352 | ||
f721889f RW |
353 | if (genpd->gov && genpd->gov->power_down_ok) { |
354 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
355 | return -EAGAIN; | |
356 | } | |
357 | ||
17b75eca | 358 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 359 | genpd->poweroff_task = current; |
17b75eca | 360 | |
4605ab65 | 361 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 362 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 363 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
364 | |
365 | if (genpd_abort_poweroff(genpd)) | |
366 | goto out; | |
367 | ||
697a7f37 RW |
368 | if (ret) { |
369 | genpd_set_active(genpd); | |
370 | goto out; | |
371 | } | |
f721889f | 372 | |
c6d22b37 RW |
373 | if (genpd->status == GPD_STATE_REPEAT) { |
374 | genpd->poweroff_task = NULL; | |
375 | goto start; | |
376 | } | |
377 | } | |
17b75eca | 378 | |
3c07cbc4 RW |
379 | if (genpd->power_off) { |
380 | if (atomic_read(&genpd->sd_count) > 0) { | |
381 | ret = -EBUSY; | |
c6d22b37 RW |
382 | goto out; |
383 | } | |
17b75eca | 384 | |
3c07cbc4 | 385 | /* |
5063ce15 RW |
386 | * If sd_count > 0 at this point, one of the subdomains hasn't |
387 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
388 | * incrementing it. In that case pm_genpd_poweron() will wait |
389 | * for us to drop the lock, so we can call .power_off() and let | |
390 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
391 | * happen very often). | |
392 | */ | |
d2805402 RW |
393 | ret = genpd->power_off(genpd); |
394 | if (ret == -EBUSY) { | |
395 | genpd_set_active(genpd); | |
d2805402 RW |
396 | goto out; |
397 | } | |
398 | } | |
f721889f | 399 | |
17b75eca | 400 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 RW |
401 | genpd->power_off_time = ktime_get(); |
402 | ||
403 | /* Update PM QoS information for devices in the domain. */ | |
404 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { | |
405 | struct gpd_timing_data *td = &to_gpd_data(pdd)->td; | |
406 | ||
407 | pm_runtime_update_max_time_suspended(pdd->dev, | |
408 | td->start_latency_ns + | |
409 | td->restore_state_latency_ns + | |
410 | genpd->power_on_latency_ns); | |
411 | } | |
f721889f | 412 | |
5063ce15 RW |
413 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
414 | genpd_sd_counter_dec(link->master); | |
415 | genpd_queue_power_off_work(link->master); | |
416 | } | |
f721889f | 417 | |
c6d22b37 RW |
418 | out: |
419 | genpd->poweroff_task = NULL; | |
420 | wake_up_all(&genpd->status_wait_queue); | |
421 | return ret; | |
f721889f RW |
422 | } |
423 | ||
424 | /** | |
425 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
426 | * @work: Work structure used for scheduling the execution of this function. | |
427 | */ | |
428 | static void genpd_power_off_work_fn(struct work_struct *work) | |
429 | { | |
430 | struct generic_pm_domain *genpd; | |
431 | ||
432 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
433 | ||
17b75eca | 434 | genpd_acquire_lock(genpd); |
f721889f | 435 | pm_genpd_poweroff(genpd); |
17b75eca | 436 | genpd_release_lock(genpd); |
f721889f RW |
437 | } |
438 | ||
439 | /** | |
440 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
441 | * @dev: Device to suspend. | |
442 | * | |
443 | * Carry out a runtime suspend of a device under the assumption that its | |
444 | * pm_domain field points to the domain member of an object of type | |
445 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
446 | */ | |
447 | static int pm_genpd_runtime_suspend(struct device *dev) | |
448 | { | |
449 | struct generic_pm_domain *genpd; | |
b02c999a | 450 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 451 | int ret; |
f721889f RW |
452 | |
453 | dev_dbg(dev, "%s()\n", __func__); | |
454 | ||
5248051b RW |
455 | genpd = dev_to_genpd(dev); |
456 | if (IS_ERR(genpd)) | |
f721889f RW |
457 | return -EINVAL; |
458 | ||
0aa2a221 RW |
459 | might_sleep_if(!genpd->dev_irq_safe); |
460 | ||
b02c999a RW |
461 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
462 | if (stop_ok && !stop_ok(dev)) | |
463 | return -EBUSY; | |
464 | ||
d5e4cbfe RW |
465 | ret = genpd_stop_dev(genpd, dev); |
466 | if (ret) | |
467 | return ret; | |
17b75eca | 468 | |
b02c999a RW |
469 | pm_runtime_update_max_time_suspended(dev, |
470 | dev_gpd_data(dev)->td.start_latency_ns); | |
471 | ||
0aa2a221 RW |
472 | /* |
473 | * If power.irq_safe is set, this routine will be run with interrupts | |
474 | * off, so it can't use mutexes. | |
475 | */ | |
476 | if (dev->power.irq_safe) | |
477 | return 0; | |
478 | ||
c6d22b37 | 479 | mutex_lock(&genpd->lock); |
f721889f RW |
480 | genpd->in_progress++; |
481 | pm_genpd_poweroff(genpd); | |
482 | genpd->in_progress--; | |
c6d22b37 | 483 | mutex_unlock(&genpd->lock); |
f721889f RW |
484 | |
485 | return 0; | |
486 | } | |
487 | ||
f721889f RW |
488 | /** |
489 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
490 | * @dev: Device to resume. | |
491 | * | |
492 | * Carry out a runtime resume of a device under the assumption that its | |
493 | * pm_domain field points to the domain member of an object of type | |
494 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
495 | */ | |
496 | static int pm_genpd_runtime_resume(struct device *dev) | |
497 | { | |
498 | struct generic_pm_domain *genpd; | |
c6d22b37 | 499 | DEFINE_WAIT(wait); |
f721889f RW |
500 | int ret; |
501 | ||
502 | dev_dbg(dev, "%s()\n", __func__); | |
503 | ||
5248051b RW |
504 | genpd = dev_to_genpd(dev); |
505 | if (IS_ERR(genpd)) | |
f721889f RW |
506 | return -EINVAL; |
507 | ||
0aa2a221 RW |
508 | might_sleep_if(!genpd->dev_irq_safe); |
509 | ||
510 | /* If power.irq_safe, the PM domain is never powered off. */ | |
511 | if (dev->power.irq_safe) | |
512 | goto out; | |
513 | ||
c6d22b37 | 514 | mutex_lock(&genpd->lock); |
3f241775 RW |
515 | ret = __pm_genpd_poweron(genpd); |
516 | if (ret) { | |
517 | mutex_unlock(&genpd->lock); | |
518 | return ret; | |
519 | } | |
17b75eca | 520 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
521 | genpd->resume_count++; |
522 | for (;;) { | |
523 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
524 | TASK_UNINTERRUPTIBLE); | |
525 | /* | |
526 | * If current is the powering off task, we have been called | |
527 | * reentrantly from one of the device callbacks, so we should | |
528 | * not wait. | |
529 | */ | |
530 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
531 | break; | |
532 | mutex_unlock(&genpd->lock); | |
533 | ||
534 | schedule(); | |
535 | ||
536 | mutex_lock(&genpd->lock); | |
537 | } | |
538 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 539 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
540 | genpd->resume_count--; |
541 | genpd_set_active(genpd); | |
17b75eca | 542 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 543 | mutex_unlock(&genpd->lock); |
17b75eca | 544 | |
0aa2a221 | 545 | out: |
d5e4cbfe | 546 | genpd_start_dev(genpd, dev); |
f721889f RW |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
17f2ae7f RW |
551 | /** |
552 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
553 | */ | |
554 | void pm_genpd_poweroff_unused(void) | |
555 | { | |
556 | struct generic_pm_domain *genpd; | |
557 | ||
558 | mutex_lock(&gpd_list_lock); | |
559 | ||
560 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
561 | genpd_queue_power_off_work(genpd); | |
562 | ||
563 | mutex_unlock(&gpd_list_lock); | |
564 | } | |
565 | ||
f721889f RW |
566 | #else |
567 | ||
568 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} | |
569 | ||
570 | #define pm_genpd_runtime_suspend NULL | |
571 | #define pm_genpd_runtime_resume NULL | |
572 | ||
573 | #endif /* CONFIG_PM_RUNTIME */ | |
574 | ||
596ba34b RW |
575 | #ifdef CONFIG_PM_SLEEP |
576 | ||
d5e4cbfe RW |
577 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
578 | struct device *dev) | |
579 | { | |
580 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
581 | } | |
582 | ||
d23b9b00 RW |
583 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
584 | { | |
585 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
586 | } | |
587 | ||
588 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
589 | { | |
590 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
591 | } | |
592 | ||
593 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
594 | { | |
595 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
596 | } | |
597 | ||
598 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
599 | { | |
600 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
601 | } | |
602 | ||
603 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
604 | { | |
605 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
606 | } | |
607 | ||
608 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
609 | { | |
610 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
611 | } | |
612 | ||
613 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
614 | { | |
615 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
616 | } | |
617 | ||
618 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
619 | { | |
620 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
621 | } | |
622 | ||
596ba34b | 623 | /** |
5063ce15 | 624 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
625 | * @genpd: PM domain to power off, if possible. |
626 | * | |
627 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 628 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
629 | * |
630 | * This function is only called in "noirq" stages of system power transitions, | |
631 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
632 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
633 | */ | |
634 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
635 | { | |
5063ce15 | 636 | struct gpd_link *link; |
596ba34b | 637 | |
17b75eca | 638 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
639 | return; |
640 | ||
c4bb3160 RW |
641 | if (genpd->suspended_count != genpd->device_count |
642 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
643 | return; |
644 | ||
645 | if (genpd->power_off) | |
646 | genpd->power_off(genpd); | |
647 | ||
17b75eca | 648 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
649 | |
650 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
651 | genpd_sd_counter_dec(link->master); | |
652 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
653 | } |
654 | } | |
655 | ||
4ecd6e65 RW |
656 | /** |
657 | * resume_needed - Check whether to resume a device before system suspend. | |
658 | * @dev: Device to check. | |
659 | * @genpd: PM domain the device belongs to. | |
660 | * | |
661 | * There are two cases in which a device that can wake up the system from sleep | |
662 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
663 | * to wake up the system and it has to remain active for this purpose while the | |
664 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
665 | * the system from sleep states and it generally doesn't generate wakeup signals | |
666 | * by itself (those signals are generated on its behalf by other parts of the | |
667 | * system). In the latter case it may be necessary to reconfigure the device's | |
668 | * wakeup settings during system suspend, because it may have been set up to | |
669 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
670 | * Return 'true' in either of the above cases. | |
671 | */ | |
672 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
673 | { | |
674 | bool active_wakeup; | |
675 | ||
676 | if (!device_can_wakeup(dev)) | |
677 | return false; | |
678 | ||
d5e4cbfe | 679 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
680 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
681 | } | |
682 | ||
596ba34b RW |
683 | /** |
684 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
685 | * @dev: Device to start the transition of. | |
686 | * | |
687 | * Start a power transition of a device (during a system-wide power transition) | |
688 | * under the assumption that its pm_domain field points to the domain member of | |
689 | * an object of type struct generic_pm_domain representing a PM domain | |
690 | * consisting of I/O devices. | |
691 | */ | |
692 | static int pm_genpd_prepare(struct device *dev) | |
693 | { | |
694 | struct generic_pm_domain *genpd; | |
b6c10c84 | 695 | int ret; |
596ba34b RW |
696 | |
697 | dev_dbg(dev, "%s()\n", __func__); | |
698 | ||
699 | genpd = dev_to_genpd(dev); | |
700 | if (IS_ERR(genpd)) | |
701 | return -EINVAL; | |
702 | ||
17b75eca RW |
703 | /* |
704 | * If a wakeup request is pending for the device, it should be woken up | |
705 | * at this point and a system wakeup event should be reported if it's | |
706 | * set up to wake up the system from sleep states. | |
707 | */ | |
708 | pm_runtime_get_noresume(dev); | |
709 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
710 | pm_wakeup_event(dev, 0); | |
711 | ||
712 | if (pm_wakeup_pending()) { | |
713 | pm_runtime_put_sync(dev); | |
714 | return -EBUSY; | |
715 | } | |
716 | ||
4ecd6e65 RW |
717 | if (resume_needed(dev, genpd)) |
718 | pm_runtime_resume(dev); | |
719 | ||
17b75eca | 720 | genpd_acquire_lock(genpd); |
596ba34b RW |
721 | |
722 | if (genpd->prepared_count++ == 0) | |
17b75eca RW |
723 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
724 | ||
725 | genpd_release_lock(genpd); | |
596ba34b RW |
726 | |
727 | if (genpd->suspend_power_off) { | |
17b75eca | 728 | pm_runtime_put_noidle(dev); |
596ba34b RW |
729 | return 0; |
730 | } | |
731 | ||
732 | /* | |
17b75eca RW |
733 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
734 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 735 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 736 | * to make it operational. |
596ba34b | 737 | */ |
17b75eca | 738 | pm_runtime_resume(dev); |
596ba34b RW |
739 | __pm_runtime_disable(dev, false); |
740 | ||
b6c10c84 RW |
741 | ret = pm_generic_prepare(dev); |
742 | if (ret) { | |
743 | mutex_lock(&genpd->lock); | |
744 | ||
745 | if (--genpd->prepared_count == 0) | |
746 | genpd->suspend_power_off = false; | |
747 | ||
748 | mutex_unlock(&genpd->lock); | |
17b75eca | 749 | pm_runtime_enable(dev); |
b6c10c84 | 750 | } |
17b75eca RW |
751 | |
752 | pm_runtime_put_sync(dev); | |
b6c10c84 | 753 | return ret; |
596ba34b RW |
754 | } |
755 | ||
756 | /** | |
757 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
758 | * @dev: Device to suspend. | |
759 | * | |
760 | * Suspend a device under the assumption that its pm_domain field points to the | |
761 | * domain member of an object of type struct generic_pm_domain representing | |
762 | * a PM domain consisting of I/O devices. | |
763 | */ | |
764 | static int pm_genpd_suspend(struct device *dev) | |
765 | { | |
766 | struct generic_pm_domain *genpd; | |
767 | ||
768 | dev_dbg(dev, "%s()\n", __func__); | |
769 | ||
770 | genpd = dev_to_genpd(dev); | |
771 | if (IS_ERR(genpd)) | |
772 | return -EINVAL; | |
773 | ||
d23b9b00 | 774 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
775 | } |
776 | ||
777 | /** | |
778 | * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. | |
779 | * @dev: Device to suspend. | |
780 | * | |
781 | * Carry out a late suspend of a device under the assumption that its | |
782 | * pm_domain field points to the domain member of an object of type | |
783 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
784 | */ | |
785 | static int pm_genpd_suspend_noirq(struct device *dev) | |
786 | { | |
787 | struct generic_pm_domain *genpd; | |
788 | int ret; | |
789 | ||
790 | dev_dbg(dev, "%s()\n", __func__); | |
791 | ||
792 | genpd = dev_to_genpd(dev); | |
793 | if (IS_ERR(genpd)) | |
794 | return -EINVAL; | |
795 | ||
796 | if (genpd->suspend_power_off) | |
797 | return 0; | |
798 | ||
d23b9b00 | 799 | ret = genpd_suspend_late(genpd, dev); |
596ba34b RW |
800 | if (ret) |
801 | return ret; | |
802 | ||
d5e4cbfe | 803 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
804 | return 0; |
805 | ||
d5e4cbfe | 806 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
807 | |
808 | /* | |
809 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
810 | * guaranteed that this function will never run twice in parallel for | |
811 | * the same PM domain, so it is not necessary to use locking here. | |
812 | */ | |
813 | genpd->suspended_count++; | |
814 | pm_genpd_sync_poweroff(genpd); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
819 | /** | |
820 | * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. | |
821 | * @dev: Device to resume. | |
822 | * | |
823 | * Carry out an early resume of a device under the assumption that its | |
824 | * pm_domain field points to the domain member of an object of type | |
825 | * struct generic_pm_domain representing a power domain consisting of I/O | |
826 | * devices. | |
827 | */ | |
828 | static int pm_genpd_resume_noirq(struct device *dev) | |
829 | { | |
830 | struct generic_pm_domain *genpd; | |
831 | ||
832 | dev_dbg(dev, "%s()\n", __func__); | |
833 | ||
834 | genpd = dev_to_genpd(dev); | |
835 | if (IS_ERR(genpd)) | |
836 | return -EINVAL; | |
837 | ||
838 | if (genpd->suspend_power_off) | |
839 | return 0; | |
840 | ||
841 | /* | |
842 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
843 | * guaranteed that this function will never run twice in parallel for | |
844 | * the same PM domain, so it is not necessary to use locking here. | |
845 | */ | |
846 | pm_genpd_poweron(genpd); | |
847 | genpd->suspended_count--; | |
d5e4cbfe | 848 | genpd_start_dev(genpd, dev); |
596ba34b | 849 | |
d23b9b00 | 850 | return genpd_resume_early(genpd, dev); |
596ba34b RW |
851 | } |
852 | ||
853 | /** | |
854 | * pm_genpd_resume - Resume a device belonging to an I/O power domain. | |
855 | * @dev: Device to resume. | |
856 | * | |
857 | * Resume a device under the assumption that its pm_domain field points to the | |
858 | * domain member of an object of type struct generic_pm_domain representing | |
859 | * a power domain consisting of I/O devices. | |
860 | */ | |
861 | static int pm_genpd_resume(struct device *dev) | |
862 | { | |
863 | struct generic_pm_domain *genpd; | |
864 | ||
865 | dev_dbg(dev, "%s()\n", __func__); | |
866 | ||
867 | genpd = dev_to_genpd(dev); | |
868 | if (IS_ERR(genpd)) | |
869 | return -EINVAL; | |
870 | ||
d23b9b00 | 871 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
872 | } |
873 | ||
874 | /** | |
875 | * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. | |
876 | * @dev: Device to freeze. | |
877 | * | |
878 | * Freeze a device under the assumption that its pm_domain field points to the | |
879 | * domain member of an object of type struct generic_pm_domain representing | |
880 | * a power domain consisting of I/O devices. | |
881 | */ | |
882 | static int pm_genpd_freeze(struct device *dev) | |
883 | { | |
884 | struct generic_pm_domain *genpd; | |
885 | ||
886 | dev_dbg(dev, "%s()\n", __func__); | |
887 | ||
888 | genpd = dev_to_genpd(dev); | |
889 | if (IS_ERR(genpd)) | |
890 | return -EINVAL; | |
891 | ||
d23b9b00 | 892 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
893 | } |
894 | ||
895 | /** | |
896 | * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. | |
897 | * @dev: Device to freeze. | |
898 | * | |
899 | * Carry out a late freeze of a device under the assumption that its | |
900 | * pm_domain field points to the domain member of an object of type | |
901 | * struct generic_pm_domain representing a power domain consisting of I/O | |
902 | * devices. | |
903 | */ | |
904 | static int pm_genpd_freeze_noirq(struct device *dev) | |
905 | { | |
906 | struct generic_pm_domain *genpd; | |
907 | int ret; | |
908 | ||
909 | dev_dbg(dev, "%s()\n", __func__); | |
910 | ||
911 | genpd = dev_to_genpd(dev); | |
912 | if (IS_ERR(genpd)) | |
913 | return -EINVAL; | |
914 | ||
915 | if (genpd->suspend_power_off) | |
916 | return 0; | |
917 | ||
d23b9b00 | 918 | ret = genpd_freeze_late(genpd, dev); |
596ba34b RW |
919 | if (ret) |
920 | return ret; | |
921 | ||
d5e4cbfe | 922 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
923 | |
924 | return 0; | |
925 | } | |
926 | ||
927 | /** | |
928 | * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. | |
929 | * @dev: Device to thaw. | |
930 | * | |
931 | * Carry out an early thaw of a device under the assumption that its | |
932 | * pm_domain field points to the domain member of an object of type | |
933 | * struct generic_pm_domain representing a power domain consisting of I/O | |
934 | * devices. | |
935 | */ | |
936 | static int pm_genpd_thaw_noirq(struct device *dev) | |
937 | { | |
938 | struct generic_pm_domain *genpd; | |
939 | ||
940 | dev_dbg(dev, "%s()\n", __func__); | |
941 | ||
942 | genpd = dev_to_genpd(dev); | |
943 | if (IS_ERR(genpd)) | |
944 | return -EINVAL; | |
945 | ||
946 | if (genpd->suspend_power_off) | |
947 | return 0; | |
948 | ||
d5e4cbfe | 949 | genpd_start_dev(genpd, dev); |
596ba34b | 950 | |
d23b9b00 | 951 | return genpd_thaw_early(genpd, dev); |
596ba34b RW |
952 | } |
953 | ||
954 | /** | |
955 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
956 | * @dev: Device to thaw. | |
957 | * | |
958 | * Thaw a device under the assumption that its pm_domain field points to the | |
959 | * domain member of an object of type struct generic_pm_domain representing | |
960 | * a power domain consisting of I/O devices. | |
961 | */ | |
962 | static int pm_genpd_thaw(struct device *dev) | |
963 | { | |
964 | struct generic_pm_domain *genpd; | |
965 | ||
966 | dev_dbg(dev, "%s()\n", __func__); | |
967 | ||
968 | genpd = dev_to_genpd(dev); | |
969 | if (IS_ERR(genpd)) | |
970 | return -EINVAL; | |
971 | ||
d23b9b00 | 972 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
973 | } |
974 | ||
975 | /** | |
976 | * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. | |
977 | * @dev: Device to resume. | |
978 | * | |
979 | * Carry out an early restore of a device under the assumption that its | |
980 | * pm_domain field points to the domain member of an object of type | |
981 | * struct generic_pm_domain representing a power domain consisting of I/O | |
982 | * devices. | |
983 | */ | |
984 | static int pm_genpd_restore_noirq(struct device *dev) | |
985 | { | |
986 | struct generic_pm_domain *genpd; | |
987 | ||
988 | dev_dbg(dev, "%s()\n", __func__); | |
989 | ||
990 | genpd = dev_to_genpd(dev); | |
991 | if (IS_ERR(genpd)) | |
992 | return -EINVAL; | |
993 | ||
994 | /* | |
995 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
996 | * guaranteed that this function will never run twice in parallel for | |
997 | * the same PM domain, so it is not necessary to use locking here. | |
998 | */ | |
17b75eca | 999 | genpd->status = GPD_STATE_POWER_OFF; |
596ba34b RW |
1000 | if (genpd->suspend_power_off) { |
1001 | /* | |
1002 | * The boot kernel might put the domain into the power on state, | |
1003 | * so make sure it really is powered off. | |
1004 | */ | |
1005 | if (genpd->power_off) | |
1006 | genpd->power_off(genpd); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | pm_genpd_poweron(genpd); | |
1011 | genpd->suspended_count--; | |
d5e4cbfe | 1012 | genpd_start_dev(genpd, dev); |
596ba34b | 1013 | |
d23b9b00 | 1014 | return genpd_resume_early(genpd, dev); |
596ba34b RW |
1015 | } |
1016 | ||
1017 | /** | |
1018 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1019 | * @dev: Device to complete the transition of. | |
1020 | * | |
1021 | * Complete a power transition of a device (during a system-wide power | |
1022 | * transition) under the assumption that its pm_domain field points to the | |
1023 | * domain member of an object of type struct generic_pm_domain representing | |
1024 | * a power domain consisting of I/O devices. | |
1025 | */ | |
1026 | static void pm_genpd_complete(struct device *dev) | |
1027 | { | |
1028 | struct generic_pm_domain *genpd; | |
1029 | bool run_complete; | |
1030 | ||
1031 | dev_dbg(dev, "%s()\n", __func__); | |
1032 | ||
1033 | genpd = dev_to_genpd(dev); | |
1034 | if (IS_ERR(genpd)) | |
1035 | return; | |
1036 | ||
1037 | mutex_lock(&genpd->lock); | |
1038 | ||
1039 | run_complete = !genpd->suspend_power_off; | |
1040 | if (--genpd->prepared_count == 0) | |
1041 | genpd->suspend_power_off = false; | |
1042 | ||
1043 | mutex_unlock(&genpd->lock); | |
1044 | ||
1045 | if (run_complete) { | |
1046 | pm_generic_complete(dev); | |
6f00ff78 | 1047 | pm_runtime_set_active(dev); |
596ba34b | 1048 | pm_runtime_enable(dev); |
6f00ff78 | 1049 | pm_runtime_idle(dev); |
596ba34b RW |
1050 | } |
1051 | } | |
1052 | ||
1053 | #else | |
1054 | ||
1055 | #define pm_genpd_prepare NULL | |
1056 | #define pm_genpd_suspend NULL | |
1057 | #define pm_genpd_suspend_noirq NULL | |
1058 | #define pm_genpd_resume_noirq NULL | |
1059 | #define pm_genpd_resume NULL | |
1060 | #define pm_genpd_freeze NULL | |
1061 | #define pm_genpd_freeze_noirq NULL | |
1062 | #define pm_genpd_thaw_noirq NULL | |
1063 | #define pm_genpd_thaw NULL | |
596ba34b | 1064 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1065 | #define pm_genpd_complete NULL |
1066 | ||
1067 | #endif /* CONFIG_PM_SLEEP */ | |
1068 | ||
f721889f | 1069 | /** |
b02c999a | 1070 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1071 | * @genpd: PM domain to add the device to. |
1072 | * @dev: Device to be added. | |
b02c999a | 1073 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1074 | */ |
b02c999a RW |
1075 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1076 | struct gpd_timing_data *td) | |
f721889f | 1077 | { |
cd0ea672 | 1078 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1079 | struct pm_domain_data *pdd; |
f721889f RW |
1080 | int ret = 0; |
1081 | ||
1082 | dev_dbg(dev, "%s()\n", __func__); | |
1083 | ||
1084 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1085 | return -EINVAL; | |
1086 | ||
17b75eca | 1087 | genpd_acquire_lock(genpd); |
f721889f | 1088 | |
17b75eca | 1089 | if (genpd->status == GPD_STATE_POWER_OFF) { |
f721889f RW |
1090 | ret = -EINVAL; |
1091 | goto out; | |
1092 | } | |
1093 | ||
596ba34b RW |
1094 | if (genpd->prepared_count > 0) { |
1095 | ret = -EAGAIN; | |
1096 | goto out; | |
1097 | } | |
1098 | ||
4605ab65 RW |
1099 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1100 | if (pdd->dev == dev) { | |
f721889f RW |
1101 | ret = -EINVAL; |
1102 | goto out; | |
1103 | } | |
1104 | ||
cd0ea672 RW |
1105 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1106 | if (!gpd_data) { | |
1107 | ret = -ENOMEM; | |
1108 | goto out; | |
1109 | } | |
1110 | ||
596ba34b | 1111 | genpd->device_count++; |
f721889f | 1112 | |
f721889f | 1113 | dev->pm_domain = &genpd->domain; |
4605ab65 | 1114 | dev_pm_get_subsys_data(dev); |
cd0ea672 RW |
1115 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1116 | gpd_data->base.dev = dev; | |
1117 | gpd_data->need_restore = false; | |
1118 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
b02c999a RW |
1119 | if (td) |
1120 | gpd_data->td = *td; | |
f721889f RW |
1121 | |
1122 | out: | |
17b75eca | 1123 | genpd_release_lock(genpd); |
f721889f RW |
1124 | |
1125 | return ret; | |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1130 | * @genpd: PM domain to remove the device from. | |
1131 | * @dev: Device to be removed. | |
1132 | */ | |
1133 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1134 | struct device *dev) | |
1135 | { | |
4605ab65 | 1136 | struct pm_domain_data *pdd; |
f721889f RW |
1137 | int ret = -EINVAL; |
1138 | ||
1139 | dev_dbg(dev, "%s()\n", __func__); | |
1140 | ||
1141 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1142 | return -EINVAL; | |
1143 | ||
17b75eca | 1144 | genpd_acquire_lock(genpd); |
f721889f | 1145 | |
596ba34b RW |
1146 | if (genpd->prepared_count > 0) { |
1147 | ret = -EAGAIN; | |
1148 | goto out; | |
1149 | } | |
1150 | ||
4605ab65 RW |
1151 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1152 | if (pdd->dev != dev) | |
f721889f RW |
1153 | continue; |
1154 | ||
4605ab65 RW |
1155 | list_del_init(&pdd->list_node); |
1156 | pdd->dev = NULL; | |
1157 | dev_pm_put_subsys_data(dev); | |
f721889f | 1158 | dev->pm_domain = NULL; |
cd0ea672 | 1159 | kfree(to_gpd_data(pdd)); |
f721889f | 1160 | |
596ba34b | 1161 | genpd->device_count--; |
f721889f RW |
1162 | |
1163 | ret = 0; | |
1164 | break; | |
1165 | } | |
1166 | ||
596ba34b | 1167 | out: |
17b75eca | 1168 | genpd_release_lock(genpd); |
f721889f RW |
1169 | |
1170 | return ret; | |
1171 | } | |
1172 | ||
1173 | /** | |
1174 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1175 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1176 | * @subdomain: Subdomain to be added. |
f721889f RW |
1177 | */ |
1178 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1179 | struct generic_pm_domain *subdomain) |
f721889f | 1180 | { |
5063ce15 | 1181 | struct gpd_link *link; |
f721889f RW |
1182 | int ret = 0; |
1183 | ||
bc0403ff | 1184 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1185 | return -EINVAL; |
1186 | ||
17b75eca RW |
1187 | start: |
1188 | genpd_acquire_lock(genpd); | |
bc0403ff | 1189 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1190 | |
bc0403ff RW |
1191 | if (subdomain->status != GPD_STATE_POWER_OFF |
1192 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1193 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1194 | genpd_release_lock(genpd); |
1195 | goto start; | |
1196 | } | |
1197 | ||
1198 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1199 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1200 | ret = -EINVAL; |
1201 | goto out; | |
1202 | } | |
1203 | ||
5063ce15 | 1204 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
bc0403ff | 1205 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1206 | ret = -EINVAL; |
1207 | goto out; | |
1208 | } | |
1209 | } | |
1210 | ||
5063ce15 RW |
1211 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1212 | if (!link) { | |
1213 | ret = -ENOMEM; | |
1214 | goto out; | |
1215 | } | |
1216 | link->master = genpd; | |
1217 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1218 | link->slave = subdomain; |
1219 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1220 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1221 | genpd_sd_counter_inc(genpd); |
f721889f | 1222 | |
f721889f | 1223 | out: |
bc0403ff | 1224 | mutex_unlock(&subdomain->lock); |
17b75eca | 1225 | genpd_release_lock(genpd); |
f721889f RW |
1226 | |
1227 | return ret; | |
1228 | } | |
1229 | ||
1230 | /** | |
1231 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1232 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1233 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1234 | */ |
1235 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1236 | struct generic_pm_domain *subdomain) |
f721889f | 1237 | { |
5063ce15 | 1238 | struct gpd_link *link; |
f721889f RW |
1239 | int ret = -EINVAL; |
1240 | ||
5063ce15 | 1241 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1242 | return -EINVAL; |
1243 | ||
17b75eca RW |
1244 | start: |
1245 | genpd_acquire_lock(genpd); | |
f721889f | 1246 | |
5063ce15 RW |
1247 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1248 | if (link->slave != subdomain) | |
f721889f RW |
1249 | continue; |
1250 | ||
1251 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1252 | ||
17b75eca RW |
1253 | if (subdomain->status != GPD_STATE_POWER_OFF |
1254 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1255 | mutex_unlock(&subdomain->lock); | |
1256 | genpd_release_lock(genpd); | |
1257 | goto start; | |
1258 | } | |
1259 | ||
5063ce15 RW |
1260 | list_del(&link->master_node); |
1261 | list_del(&link->slave_node); | |
1262 | kfree(link); | |
17b75eca | 1263 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1264 | genpd_sd_counter_dec(genpd); |
1265 | ||
1266 | mutex_unlock(&subdomain->lock); | |
1267 | ||
1268 | ret = 0; | |
1269 | break; | |
1270 | } | |
1271 | ||
17b75eca | 1272 | genpd_release_lock(genpd); |
f721889f RW |
1273 | |
1274 | return ret; | |
1275 | } | |
1276 | ||
d5e4cbfe RW |
1277 | /** |
1278 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1279 | * @dev: Device to add the callbacks to. | |
1280 | * @ops: Set of callbacks to add. | |
b02c999a | 1281 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1282 | */ |
b02c999a RW |
1283 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1284 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1285 | { |
1286 | struct pm_domain_data *pdd; | |
1287 | int ret = 0; | |
1288 | ||
1289 | if (!(dev && dev->power.subsys_data && ops)) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | pm_runtime_disable(dev); | |
1293 | device_pm_lock(); | |
1294 | ||
1295 | pdd = dev->power.subsys_data->domain_data; | |
1296 | if (pdd) { | |
1297 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1298 | ||
1299 | gpd_data->ops = *ops; | |
b02c999a RW |
1300 | if (td) |
1301 | gpd_data->td = *td; | |
d5e4cbfe RW |
1302 | } else { |
1303 | ret = -EINVAL; | |
1304 | } | |
1305 | ||
1306 | device_pm_unlock(); | |
1307 | pm_runtime_enable(dev); | |
1308 | ||
1309 | return ret; | |
1310 | } | |
1311 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1312 | ||
1313 | /** | |
b02c999a | 1314 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1315 | * @dev: Device to remove the callbacks from. |
b02c999a | 1316 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1317 | */ |
b02c999a | 1318 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1319 | { |
1320 | struct pm_domain_data *pdd; | |
1321 | int ret = 0; | |
1322 | ||
1323 | if (!(dev && dev->power.subsys_data)) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | pm_runtime_disable(dev); | |
1327 | device_pm_lock(); | |
1328 | ||
1329 | pdd = dev->power.subsys_data->domain_data; | |
1330 | if (pdd) { | |
1331 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1332 | ||
1333 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1334 | if (clear_td) |
1335 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1336 | } else { |
1337 | ret = -EINVAL; | |
1338 | } | |
1339 | ||
1340 | device_pm_unlock(); | |
1341 | pm_runtime_enable(dev); | |
1342 | ||
1343 | return ret; | |
1344 | } | |
b02c999a | 1345 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1346 | |
d23b9b00 RW |
1347 | /* Default device callbacks for generic PM domains. */ |
1348 | ||
ecf00475 RW |
1349 | /** |
1350 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1351 | * @dev: Device to handle. | |
1352 | */ | |
1353 | static int pm_genpd_default_save_state(struct device *dev) | |
1354 | { | |
1355 | int (*cb)(struct device *__dev); | |
1356 | struct device_driver *drv = dev->driver; | |
1357 | ||
1358 | cb = dev_gpd_data(dev)->ops.save_state; | |
1359 | if (cb) | |
1360 | return cb(dev); | |
1361 | ||
1362 | if (drv && drv->pm && drv->pm->runtime_suspend) | |
1363 | return drv->pm->runtime_suspend(dev); | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | /** | |
1369 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1370 | * @dev: Device to handle. | |
1371 | */ | |
1372 | static int pm_genpd_default_restore_state(struct device *dev) | |
1373 | { | |
1374 | int (*cb)(struct device *__dev); | |
1375 | struct device_driver *drv = dev->driver; | |
1376 | ||
1377 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1378 | if (cb) | |
1379 | return cb(dev); | |
1380 | ||
1381 | if (drv && drv->pm && drv->pm->runtime_resume) | |
1382 | return drv->pm->runtime_resume(dev); | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
d23b9b00 RW |
1387 | /** |
1388 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1389 | * @dev: Device to handle. | |
1390 | */ | |
1391 | static int pm_genpd_default_suspend(struct device *dev) | |
1392 | { | |
1393 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1394 | ||
1395 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1400 | * @dev: Device to handle. | |
1401 | */ | |
1402 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1403 | { | |
1404 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1405 | ||
1406 | return cb ? cb(dev) : pm_generic_suspend_noirq(dev); | |
1407 | } | |
1408 | ||
1409 | /** | |
1410 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1411 | * @dev: Device to handle. | |
1412 | */ | |
1413 | static int pm_genpd_default_resume_early(struct device *dev) | |
1414 | { | |
1415 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1416 | ||
1417 | return cb ? cb(dev) : pm_generic_resume_noirq(dev); | |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1422 | * @dev: Device to handle. | |
1423 | */ | |
1424 | static int pm_genpd_default_resume(struct device *dev) | |
1425 | { | |
1426 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1427 | ||
1428 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1429 | } | |
1430 | ||
1431 | /** | |
1432 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1433 | * @dev: Device to handle. | |
1434 | */ | |
1435 | static int pm_genpd_default_freeze(struct device *dev) | |
1436 | { | |
1437 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1438 | ||
1439 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1440 | } | |
1441 | ||
1442 | /** | |
1443 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1444 | * @dev: Device to handle. | |
1445 | */ | |
1446 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1447 | { | |
1448 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1449 | ||
1450 | return cb ? cb(dev) : pm_generic_freeze_noirq(dev); | |
1451 | } | |
1452 | ||
1453 | /** | |
1454 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1455 | * @dev: Device to handle. | |
1456 | */ | |
1457 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1458 | { | |
1459 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1460 | ||
1461 | return cb ? cb(dev) : pm_generic_thaw_noirq(dev); | |
1462 | } | |
1463 | ||
1464 | /** | |
1465 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1466 | * @dev: Device to handle. | |
1467 | */ | |
1468 | static int pm_genpd_default_thaw(struct device *dev) | |
1469 | { | |
1470 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1471 | ||
1472 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1473 | } | |
1474 | ||
f721889f RW |
1475 | /** |
1476 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1477 | * @genpd: PM domain object to initialize. | |
1478 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1479 | * @is_off: Initial value of the domain's power_is_off field. | |
1480 | */ | |
1481 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1482 | struct dev_power_governor *gov, bool is_off) | |
1483 | { | |
1484 | if (IS_ERR_OR_NULL(genpd)) | |
1485 | return; | |
1486 | ||
5063ce15 RW |
1487 | INIT_LIST_HEAD(&genpd->master_links); |
1488 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1489 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1490 | mutex_init(&genpd->lock); |
1491 | genpd->gov = gov; | |
1492 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1493 | genpd->in_progress = 0; | |
c4bb3160 | 1494 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1495 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1496 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1497 | genpd->poweroff_task = NULL; |
1498 | genpd->resume_count = 0; | |
596ba34b RW |
1499 | genpd->device_count = 0; |
1500 | genpd->suspended_count = 0; | |
221e9b58 | 1501 | genpd->max_off_time_ns = -1; |
f721889f RW |
1502 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1503 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1504 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1505 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1506 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
1507 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; | |
1508 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
1509 | genpd->domain.ops.resume = pm_genpd_resume; | |
1510 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
1511 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; | |
1512 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
1513 | genpd->domain.ops.thaw = pm_genpd_thaw; | |
d23b9b00 RW |
1514 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
1515 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; | |
596ba34b | 1516 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
d23b9b00 | 1517 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1518 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1519 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1520 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
d23b9b00 RW |
1521 | genpd->dev_ops.freeze = pm_genpd_default_suspend; |
1522 | genpd->dev_ops.freeze_late = pm_genpd_default_suspend_late; | |
1523 | genpd->dev_ops.thaw_early = pm_genpd_default_resume_early; | |
1524 | genpd->dev_ops.thaw = pm_genpd_default_resume; | |
1525 | genpd->dev_ops.freeze = pm_genpd_default_freeze; | |
1526 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1527 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1528 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1529 | mutex_lock(&gpd_list_lock); |
1530 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1531 | mutex_unlock(&gpd_list_lock); | |
1532 | } |