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Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/pm_runtime.h> | |
13 | #include <linux/pm_domain.h> | |
6ff7bb0d | 14 | #include <linux/pm_qos.h> |
f721889f RW |
15 | #include <linux/slab.h> |
16 | #include <linux/err.h> | |
17b75eca RW |
17 | #include <linux/sched.h> |
18 | #include <linux/suspend.h> | |
d5e4cbfe RW |
19 | #include <linux/export.h> |
20 | ||
21 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
22 | ({ \ | |
23 | type (*__routine)(struct device *__d); \ | |
24 | type __ret = (type)0; \ | |
25 | \ | |
26 | __routine = genpd->dev_ops.callback; \ | |
27 | if (__routine) { \ | |
28 | __ret = __routine(dev); \ | |
29 | } else { \ | |
30 | __routine = dev_gpd_data(dev)->ops.callback; \ | |
31 | if (__routine) \ | |
32 | __ret = __routine(dev); \ | |
33 | } \ | |
34 | __ret; \ | |
35 | }) | |
f721889f | 36 | |
0140d8bd RW |
37 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
38 | ({ \ | |
39 | ktime_t __start = ktime_get(); \ | |
40 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
41 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
42 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
43 | if (!__retval && __elapsed > __td->field) { \ | |
44 | __td->field = __elapsed; \ | |
0140d8bd RW |
45 | dev_warn(dev, name " latency exceeded, new value %lld ns\n", \ |
46 | __elapsed); \ | |
6ff7bb0d RW |
47 | genpd->max_off_time_changed = true; \ |
48 | __td->constraint_changed = true; \ | |
0140d8bd RW |
49 | } \ |
50 | __retval; \ | |
51 | }) | |
52 | ||
5125bbf3 RW |
53 | static LIST_HEAD(gpd_list); |
54 | static DEFINE_MUTEX(gpd_list_lock); | |
55 | ||
8bc0251d RW |
56 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
57 | { | |
58 | struct generic_pm_domain *genpd = NULL, *gpd; | |
59 | ||
60 | if (IS_ERR_OR_NULL(domain_name)) | |
61 | return NULL; | |
62 | ||
63 | mutex_lock(&gpd_list_lock); | |
64 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
65 | if (!strcmp(gpd->name, domain_name)) { | |
66 | genpd = gpd; | |
67 | break; | |
68 | } | |
69 | } | |
70 | mutex_unlock(&gpd_list_lock); | |
71 | return genpd; | |
72 | } | |
73 | ||
5248051b RW |
74 | #ifdef CONFIG_PM |
75 | ||
b02c999a | 76 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
77 | { |
78 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
79 | return ERR_PTR(-EINVAL); | |
80 | ||
596ba34b | 81 | return pd_to_genpd(dev->pm_domain); |
5248051b | 82 | } |
f721889f | 83 | |
d5e4cbfe RW |
84 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
85 | { | |
0140d8bd RW |
86 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
87 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
88 | } |
89 | ||
90 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
91 | { | |
0140d8bd RW |
92 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
93 | start_latency_ns, "start"); | |
d5e4cbfe RW |
94 | } |
95 | ||
c4bb3160 | 96 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 97 | { |
c4bb3160 RW |
98 | bool ret = false; |
99 | ||
100 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
101 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
102 | ||
103 | return ret; | |
104 | } | |
105 | ||
106 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
107 | { | |
108 | atomic_inc(&genpd->sd_count); | |
109 | smp_mb__after_atomic_inc(); | |
f721889f RW |
110 | } |
111 | ||
17b75eca RW |
112 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
113 | { | |
114 | DEFINE_WAIT(wait); | |
115 | ||
116 | mutex_lock(&genpd->lock); | |
117 | /* | |
118 | * Wait for the domain to transition into either the active, | |
119 | * or the power off state. | |
120 | */ | |
121 | for (;;) { | |
122 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
123 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
124 | if (genpd->status == GPD_STATE_ACTIVE |
125 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
126 | break; |
127 | mutex_unlock(&genpd->lock); | |
128 | ||
129 | schedule(); | |
130 | ||
131 | mutex_lock(&genpd->lock); | |
132 | } | |
133 | finish_wait(&genpd->status_wait_queue, &wait); | |
134 | } | |
135 | ||
136 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
137 | { | |
138 | mutex_unlock(&genpd->lock); | |
139 | } | |
140 | ||
c6d22b37 RW |
141 | static void genpd_set_active(struct generic_pm_domain *genpd) |
142 | { | |
143 | if (genpd->resume_count == 0) | |
144 | genpd->status = GPD_STATE_ACTIVE; | |
145 | } | |
146 | ||
cbc9ef02 RW |
147 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
148 | { | |
149 | s64 usecs64; | |
150 | ||
151 | if (!genpd->cpu_data) | |
152 | return; | |
153 | ||
154 | usecs64 = genpd->power_on_latency_ns; | |
155 | do_div(usecs64, NSEC_PER_USEC); | |
156 | usecs64 += genpd->cpu_data->saved_exit_latency; | |
157 | genpd->cpu_data->idle_state->exit_latency = usecs64; | |
158 | } | |
159 | ||
5248051b | 160 | /** |
5063ce15 | 161 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
162 | * @genpd: PM domain to power up. |
163 | * | |
5063ce15 | 164 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
165 | * resume a device belonging to it. |
166 | */ | |
8951ef02 | 167 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 168 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 169 | { |
5063ce15 | 170 | struct gpd_link *link; |
3f241775 | 171 | DEFINE_WAIT(wait); |
5248051b RW |
172 | int ret = 0; |
173 | ||
5063ce15 | 174 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
175 | for (;;) { |
176 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
177 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 178 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
179 | break; |
180 | mutex_unlock(&genpd->lock); | |
17b75eca | 181 | |
3f241775 RW |
182 | schedule(); |
183 | ||
184 | mutex_lock(&genpd->lock); | |
185 | } | |
186 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 187 | |
17b75eca | 188 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 189 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 190 | return 0; |
5248051b | 191 | |
c6d22b37 RW |
192 | if (genpd->status != GPD_STATE_POWER_OFF) { |
193 | genpd_set_active(genpd); | |
3f241775 | 194 | return 0; |
c6d22b37 RW |
195 | } |
196 | ||
cbc9ef02 RW |
197 | if (genpd->cpu_data) { |
198 | cpuidle_pause_and_lock(); | |
199 | genpd->cpu_data->idle_state->disabled = true; | |
200 | cpuidle_resume_and_unlock(); | |
201 | goto out; | |
202 | } | |
203 | ||
5063ce15 RW |
204 | /* |
205 | * The list is guaranteed not to change while the loop below is being | |
206 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
207 | * with it. | |
208 | */ | |
209 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
210 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 211 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 212 | |
5248051b | 213 | mutex_unlock(&genpd->lock); |
5248051b | 214 | |
5063ce15 | 215 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
216 | |
217 | mutex_lock(&genpd->lock); | |
218 | ||
3f241775 RW |
219 | /* |
220 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 221 | * while the master is powering on. |
3f241775 RW |
222 | */ |
223 | genpd->status = GPD_STATE_POWER_OFF; | |
224 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
225 | if (ret) { |
226 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 227 | goto err; |
5063ce15 | 228 | } |
5248051b RW |
229 | } |
230 | ||
9e08cf42 | 231 | if (genpd->power_on) { |
0140d8bd RW |
232 | ktime_t time_start = ktime_get(); |
233 | s64 elapsed_ns; | |
234 | ||
fe202fde | 235 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
236 | if (ret) |
237 | goto err; | |
0140d8bd RW |
238 | |
239 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 240 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 241 | genpd->power_on_latency_ns = elapsed_ns; |
6ff7bb0d | 242 | genpd->max_off_time_changed = true; |
cbc9ef02 | 243 | genpd_recalc_cpu_exit_latency(genpd); |
e84b2c20 RW |
244 | if (genpd->name) |
245 | pr_warning("%s: Power-on latency exceeded, " | |
246 | "new value %lld ns\n", genpd->name, | |
247 | elapsed_ns); | |
248 | } | |
3c07cbc4 | 249 | } |
5248051b | 250 | |
cbc9ef02 | 251 | out: |
9e08cf42 RW |
252 | genpd_set_active(genpd); |
253 | ||
3f241775 | 254 | return 0; |
9e08cf42 RW |
255 | |
256 | err: | |
5063ce15 RW |
257 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
258 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 259 | |
3f241775 RW |
260 | return ret; |
261 | } | |
262 | ||
263 | /** | |
5063ce15 | 264 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
265 | * @genpd: PM domain to power up. |
266 | */ | |
267 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
268 | { | |
269 | int ret; | |
270 | ||
271 | mutex_lock(&genpd->lock); | |
272 | ret = __pm_genpd_poweron(genpd); | |
273 | mutex_unlock(&genpd->lock); | |
274 | return ret; | |
5248051b RW |
275 | } |
276 | ||
8bc0251d RW |
277 | /** |
278 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
279 | * @domain_name: Name of the PM domain to power up. | |
280 | */ | |
281 | int pm_genpd_name_poweron(const char *domain_name) | |
282 | { | |
283 | struct generic_pm_domain *genpd; | |
284 | ||
285 | genpd = pm_genpd_lookup_name(domain_name); | |
286 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
287 | } | |
288 | ||
5248051b RW |
289 | #endif /* CONFIG_PM */ |
290 | ||
291 | #ifdef CONFIG_PM_RUNTIME | |
292 | ||
b3d3b9fb SK |
293 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
294 | struct device *dev) | |
295 | { | |
296 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
297 | } | |
298 | ||
8e9afafd RW |
299 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
300 | { | |
301 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
302 | save_state_latency_ns, "state save"); | |
303 | } | |
304 | ||
305 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
306 | { | |
307 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
308 | restore_state_latency_ns, | |
309 | "state restore"); | |
310 | } | |
311 | ||
6ff7bb0d RW |
312 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
313 | unsigned long val, void *ptr) | |
314 | { | |
315 | struct generic_pm_domain_data *gpd_data; | |
316 | struct device *dev; | |
317 | ||
318 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
319 | ||
320 | mutex_lock(&gpd_data->lock); | |
321 | dev = gpd_data->base.dev; | |
322 | if (!dev) { | |
323 | mutex_unlock(&gpd_data->lock); | |
324 | return NOTIFY_DONE; | |
325 | } | |
326 | mutex_unlock(&gpd_data->lock); | |
327 | ||
328 | for (;;) { | |
329 | struct generic_pm_domain *genpd; | |
330 | struct pm_domain_data *pdd; | |
331 | ||
332 | spin_lock_irq(&dev->power.lock); | |
333 | ||
334 | pdd = dev->power.subsys_data ? | |
335 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 336 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
337 | to_gpd_data(pdd)->td.constraint_changed = true; |
338 | genpd = dev_to_genpd(dev); | |
339 | } else { | |
340 | genpd = ERR_PTR(-ENODATA); | |
341 | } | |
342 | ||
343 | spin_unlock_irq(&dev->power.lock); | |
344 | ||
345 | if (!IS_ERR(genpd)) { | |
346 | mutex_lock(&genpd->lock); | |
347 | genpd->max_off_time_changed = true; | |
348 | mutex_unlock(&genpd->lock); | |
349 | } | |
350 | ||
351 | dev = dev->parent; | |
352 | if (!dev || dev->power.ignore_children) | |
353 | break; | |
354 | } | |
355 | ||
356 | return NOTIFY_DONE; | |
357 | } | |
358 | ||
f721889f RW |
359 | /** |
360 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 361 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
362 | * @genpd: PM domain the device belongs to. |
363 | */ | |
4605ab65 | 364 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 365 | struct generic_pm_domain *genpd) |
17b75eca | 366 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 367 | { |
cd0ea672 | 368 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 369 | struct device *dev = pdd->dev; |
f721889f RW |
370 | int ret = 0; |
371 | ||
cd0ea672 | 372 | if (gpd_data->need_restore) |
f721889f RW |
373 | return 0; |
374 | ||
17b75eca RW |
375 | mutex_unlock(&genpd->lock); |
376 | ||
ecf00475 RW |
377 | genpd_start_dev(genpd, dev); |
378 | ret = genpd_save_dev(genpd, dev); | |
379 | genpd_stop_dev(genpd, dev); | |
f721889f | 380 | |
17b75eca RW |
381 | mutex_lock(&genpd->lock); |
382 | ||
f721889f | 383 | if (!ret) |
cd0ea672 | 384 | gpd_data->need_restore = true; |
f721889f RW |
385 | |
386 | return ret; | |
387 | } | |
388 | ||
389 | /** | |
390 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 391 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
392 | * @genpd: PM domain the device belongs to. |
393 | */ | |
4605ab65 | 394 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 395 | struct generic_pm_domain *genpd) |
17b75eca | 396 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 397 | { |
cd0ea672 | 398 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 399 | struct device *dev = pdd->dev; |
80de3d7f | 400 | bool need_restore = gpd_data->need_restore; |
f721889f | 401 | |
80de3d7f | 402 | gpd_data->need_restore = false; |
17b75eca RW |
403 | mutex_unlock(&genpd->lock); |
404 | ||
ecf00475 | 405 | genpd_start_dev(genpd, dev); |
80de3d7f RW |
406 | if (need_restore) |
407 | genpd_restore_dev(genpd, dev); | |
f721889f | 408 | |
17b75eca | 409 | mutex_lock(&genpd->lock); |
f721889f RW |
410 | } |
411 | ||
c6d22b37 RW |
412 | /** |
413 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
414 | * @genpd: PM domain to check. | |
415 | * | |
416 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
417 | * a "power off" operation, which means that a "power on" has occured in the | |
418 | * meantime, or if its resume_count field is different from zero, which means | |
419 | * that one of its devices has been resumed in the meantime. | |
420 | */ | |
421 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
422 | { | |
17877eb5 | 423 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 424 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
425 | } |
426 | ||
56375fd4 RW |
427 | /** |
428 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
429 | * @genpd: PM domait to power off. | |
430 | * | |
431 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
432 | * before. | |
433 | */ | |
0bc5b2de | 434 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
435 | { |
436 | if (!work_pending(&genpd->power_off_work)) | |
437 | queue_work(pm_wq, &genpd->power_off_work); | |
438 | } | |
439 | ||
f721889f RW |
440 | /** |
441 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
442 | * @genpd: PM domain to power down. | |
443 | * | |
444 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
445 | * have been powered down, run the runtime suspend callbacks provided by all of | |
446 | * the @genpd's devices' drivers and remove power from @genpd. | |
447 | */ | |
448 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 449 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 450 | { |
4605ab65 | 451 | struct pm_domain_data *pdd; |
5063ce15 | 452 | struct gpd_link *link; |
f721889f | 453 | unsigned int not_suspended; |
c6d22b37 | 454 | int ret = 0; |
f721889f | 455 | |
c6d22b37 RW |
456 | start: |
457 | /* | |
458 | * Do not try to power off the domain in the following situations: | |
459 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 460 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 461 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 462 | * (4) System suspend is in progress. |
c6d22b37 | 463 | */ |
3f241775 | 464 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 465 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 466 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
467 | return 0; |
468 | ||
c4bb3160 | 469 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
470 | return -EBUSY; |
471 | ||
472 | not_suspended = 0; | |
34b1f762 RW |
473 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
474 | enum pm_qos_flags_status stat; | |
475 | ||
476 | stat = dev_pm_qos_flags(pdd->dev, | |
477 | PM_QOS_FLAG_NO_POWER_OFF | |
478 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
479 | if (stat > PM_QOS_FLAGS_NONE) | |
480 | return -EBUSY; | |
481 | ||
0aa2a221 | 482 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 483 | || pdd->dev->power.irq_safe)) |
f721889f | 484 | not_suspended++; |
34b1f762 | 485 | } |
f721889f RW |
486 | |
487 | if (not_suspended > genpd->in_progress) | |
488 | return -EBUSY; | |
489 | ||
c6d22b37 RW |
490 | if (genpd->poweroff_task) { |
491 | /* | |
492 | * Another instance of pm_genpd_poweroff() is executing | |
493 | * callbacks, so tell it to start over and return. | |
494 | */ | |
495 | genpd->status = GPD_STATE_REPEAT; | |
496 | return 0; | |
497 | } | |
498 | ||
f721889f RW |
499 | if (genpd->gov && genpd->gov->power_down_ok) { |
500 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
501 | return -EAGAIN; | |
502 | } | |
503 | ||
17b75eca | 504 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 505 | genpd->poweroff_task = current; |
17b75eca | 506 | |
4605ab65 | 507 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 508 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 509 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
510 | |
511 | if (genpd_abort_poweroff(genpd)) | |
512 | goto out; | |
513 | ||
697a7f37 RW |
514 | if (ret) { |
515 | genpd_set_active(genpd); | |
516 | goto out; | |
517 | } | |
f721889f | 518 | |
c6d22b37 RW |
519 | if (genpd->status == GPD_STATE_REPEAT) { |
520 | genpd->poweroff_task = NULL; | |
521 | goto start; | |
522 | } | |
523 | } | |
17b75eca | 524 | |
cbc9ef02 RW |
525 | if (genpd->cpu_data) { |
526 | /* | |
527 | * If cpu_data is set, cpuidle should turn the domain off when | |
528 | * the CPU in it is idle. In that case we don't decrement the | |
529 | * subdomain counts of the master domains, so that power is not | |
530 | * removed from the current domain prematurely as a result of | |
531 | * cutting off the masters' power. | |
532 | */ | |
533 | genpd->status = GPD_STATE_POWER_OFF; | |
534 | cpuidle_pause_and_lock(); | |
535 | genpd->cpu_data->idle_state->disabled = false; | |
536 | cpuidle_resume_and_unlock(); | |
537 | goto out; | |
538 | } | |
539 | ||
3c07cbc4 | 540 | if (genpd->power_off) { |
0140d8bd RW |
541 | ktime_t time_start; |
542 | s64 elapsed_ns; | |
543 | ||
3c07cbc4 RW |
544 | if (atomic_read(&genpd->sd_count) > 0) { |
545 | ret = -EBUSY; | |
c6d22b37 RW |
546 | goto out; |
547 | } | |
17b75eca | 548 | |
0140d8bd RW |
549 | time_start = ktime_get(); |
550 | ||
3c07cbc4 | 551 | /* |
5063ce15 RW |
552 | * If sd_count > 0 at this point, one of the subdomains hasn't |
553 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
554 | * incrementing it. In that case pm_genpd_poweron() will wait |
555 | * for us to drop the lock, so we can call .power_off() and let | |
556 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
557 | * happen very often). | |
558 | */ | |
d2805402 RW |
559 | ret = genpd->power_off(genpd); |
560 | if (ret == -EBUSY) { | |
561 | genpd_set_active(genpd); | |
d2805402 RW |
562 | goto out; |
563 | } | |
0140d8bd RW |
564 | |
565 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 566 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 567 | genpd->power_off_latency_ns = elapsed_ns; |
6ff7bb0d | 568 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
569 | if (genpd->name) |
570 | pr_warning("%s: Power-off latency exceeded, " | |
571 | "new value %lld ns\n", genpd->name, | |
572 | elapsed_ns); | |
573 | } | |
d2805402 | 574 | } |
f721889f | 575 | |
17b75eca | 576 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 577 | |
5063ce15 RW |
578 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
579 | genpd_sd_counter_dec(link->master); | |
580 | genpd_queue_power_off_work(link->master); | |
581 | } | |
f721889f | 582 | |
c6d22b37 RW |
583 | out: |
584 | genpd->poweroff_task = NULL; | |
585 | wake_up_all(&genpd->status_wait_queue); | |
586 | return ret; | |
f721889f RW |
587 | } |
588 | ||
589 | /** | |
590 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
591 | * @work: Work structure used for scheduling the execution of this function. | |
592 | */ | |
593 | static void genpd_power_off_work_fn(struct work_struct *work) | |
594 | { | |
595 | struct generic_pm_domain *genpd; | |
596 | ||
597 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
598 | ||
17b75eca | 599 | genpd_acquire_lock(genpd); |
f721889f | 600 | pm_genpd_poweroff(genpd); |
17b75eca | 601 | genpd_release_lock(genpd); |
f721889f RW |
602 | } |
603 | ||
604 | /** | |
605 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
606 | * @dev: Device to suspend. | |
607 | * | |
608 | * Carry out a runtime suspend of a device under the assumption that its | |
609 | * pm_domain field points to the domain member of an object of type | |
610 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
611 | */ | |
612 | static int pm_genpd_runtime_suspend(struct device *dev) | |
613 | { | |
614 | struct generic_pm_domain *genpd; | |
b02c999a | 615 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 616 | int ret; |
f721889f RW |
617 | |
618 | dev_dbg(dev, "%s()\n", __func__); | |
619 | ||
5248051b RW |
620 | genpd = dev_to_genpd(dev); |
621 | if (IS_ERR(genpd)) | |
f721889f RW |
622 | return -EINVAL; |
623 | ||
0aa2a221 RW |
624 | might_sleep_if(!genpd->dev_irq_safe); |
625 | ||
b02c999a RW |
626 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
627 | if (stop_ok && !stop_ok(dev)) | |
628 | return -EBUSY; | |
629 | ||
d5e4cbfe RW |
630 | ret = genpd_stop_dev(genpd, dev); |
631 | if (ret) | |
632 | return ret; | |
17b75eca | 633 | |
0aa2a221 RW |
634 | /* |
635 | * If power.irq_safe is set, this routine will be run with interrupts | |
636 | * off, so it can't use mutexes. | |
637 | */ | |
638 | if (dev->power.irq_safe) | |
639 | return 0; | |
640 | ||
c6d22b37 | 641 | mutex_lock(&genpd->lock); |
f721889f RW |
642 | genpd->in_progress++; |
643 | pm_genpd_poweroff(genpd); | |
644 | genpd->in_progress--; | |
c6d22b37 | 645 | mutex_unlock(&genpd->lock); |
f721889f RW |
646 | |
647 | return 0; | |
648 | } | |
649 | ||
f721889f RW |
650 | /** |
651 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
652 | * @dev: Device to resume. | |
653 | * | |
654 | * Carry out a runtime resume of a device under the assumption that its | |
655 | * pm_domain field points to the domain member of an object of type | |
656 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
657 | */ | |
658 | static int pm_genpd_runtime_resume(struct device *dev) | |
659 | { | |
660 | struct generic_pm_domain *genpd; | |
c6d22b37 | 661 | DEFINE_WAIT(wait); |
f721889f RW |
662 | int ret; |
663 | ||
664 | dev_dbg(dev, "%s()\n", __func__); | |
665 | ||
5248051b RW |
666 | genpd = dev_to_genpd(dev); |
667 | if (IS_ERR(genpd)) | |
f721889f RW |
668 | return -EINVAL; |
669 | ||
0aa2a221 RW |
670 | might_sleep_if(!genpd->dev_irq_safe); |
671 | ||
672 | /* If power.irq_safe, the PM domain is never powered off. */ | |
673 | if (dev->power.irq_safe) | |
e2e3e4e5 | 674 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 675 | |
c6d22b37 | 676 | mutex_lock(&genpd->lock); |
3f241775 RW |
677 | ret = __pm_genpd_poweron(genpd); |
678 | if (ret) { | |
679 | mutex_unlock(&genpd->lock); | |
680 | return ret; | |
681 | } | |
17b75eca | 682 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
683 | genpd->resume_count++; |
684 | for (;;) { | |
685 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
686 | TASK_UNINTERRUPTIBLE); | |
687 | /* | |
688 | * If current is the powering off task, we have been called | |
689 | * reentrantly from one of the device callbacks, so we should | |
690 | * not wait. | |
691 | */ | |
692 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
693 | break; | |
694 | mutex_unlock(&genpd->lock); | |
695 | ||
696 | schedule(); | |
697 | ||
698 | mutex_lock(&genpd->lock); | |
699 | } | |
700 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 701 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
702 | genpd->resume_count--; |
703 | genpd_set_active(genpd); | |
17b75eca | 704 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 705 | mutex_unlock(&genpd->lock); |
17b75eca | 706 | |
f721889f RW |
707 | return 0; |
708 | } | |
709 | ||
17f2ae7f RW |
710 | /** |
711 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
712 | */ | |
713 | void pm_genpd_poweroff_unused(void) | |
714 | { | |
715 | struct generic_pm_domain *genpd; | |
716 | ||
717 | mutex_lock(&gpd_list_lock); | |
718 | ||
719 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
720 | genpd_queue_power_off_work(genpd); | |
721 | ||
722 | mutex_unlock(&gpd_list_lock); | |
723 | } | |
724 | ||
f721889f RW |
725 | #else |
726 | ||
6ff7bb0d RW |
727 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
728 | unsigned long val, void *ptr) | |
729 | { | |
730 | return NOTIFY_DONE; | |
731 | } | |
732 | ||
f721889f RW |
733 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
734 | ||
735 | #define pm_genpd_runtime_suspend NULL | |
736 | #define pm_genpd_runtime_resume NULL | |
737 | ||
738 | #endif /* CONFIG_PM_RUNTIME */ | |
739 | ||
596ba34b RW |
740 | #ifdef CONFIG_PM_SLEEP |
741 | ||
77f827de RW |
742 | /** |
743 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
744 | * @genpd: PM domain to check. | |
745 | */ | |
746 | static bool pm_genpd_present(struct generic_pm_domain *genpd) | |
747 | { | |
748 | struct generic_pm_domain *gpd; | |
749 | ||
750 | if (IS_ERR_OR_NULL(genpd)) | |
751 | return false; | |
752 | ||
753 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
754 | if (gpd == genpd) | |
755 | return true; | |
756 | ||
757 | return false; | |
758 | } | |
759 | ||
d5e4cbfe RW |
760 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
761 | struct device *dev) | |
762 | { | |
763 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
764 | } | |
765 | ||
d23b9b00 RW |
766 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
767 | { | |
768 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
769 | } | |
770 | ||
771 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
772 | { | |
773 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
774 | } | |
775 | ||
776 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
777 | { | |
778 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
779 | } | |
780 | ||
781 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
782 | { | |
783 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
784 | } | |
785 | ||
786 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
787 | { | |
788 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
789 | } | |
790 | ||
791 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
792 | { | |
793 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
794 | } | |
795 | ||
796 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
797 | { | |
798 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
799 | } | |
800 | ||
801 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
802 | { | |
803 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
804 | } | |
805 | ||
596ba34b | 806 | /** |
5063ce15 | 807 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
808 | * @genpd: PM domain to power off, if possible. |
809 | * | |
810 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 811 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 812 | * |
77f827de RW |
813 | * This function is only called in "noirq" and "syscore" stages of system power |
814 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
815 | * executed sequentially, so it is guaranteed that it will never run twice in | |
816 | * parallel). | |
596ba34b RW |
817 | */ |
818 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
819 | { | |
5063ce15 | 820 | struct gpd_link *link; |
596ba34b | 821 | |
17b75eca | 822 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
823 | return; |
824 | ||
c4bb3160 RW |
825 | if (genpd->suspended_count != genpd->device_count |
826 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
827 | return; |
828 | ||
829 | if (genpd->power_off) | |
830 | genpd->power_off(genpd); | |
831 | ||
17b75eca | 832 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
833 | |
834 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
835 | genpd_sd_counter_dec(link->master); | |
836 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
837 | } |
838 | } | |
839 | ||
802d8b49 RW |
840 | /** |
841 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
842 | * @genpd: PM domain to power on. | |
843 | * | |
77f827de RW |
844 | * This function is only called in "noirq" and "syscore" stages of system power |
845 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
846 | * executed sequentially, so it is guaranteed that it will never run twice in | |
847 | * parallel). | |
802d8b49 RW |
848 | */ |
849 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
850 | { | |
851 | struct gpd_link *link; | |
852 | ||
853 | if (genpd->status != GPD_STATE_POWER_OFF) | |
854 | return; | |
855 | ||
856 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
857 | pm_genpd_sync_poweron(link->master); | |
858 | genpd_sd_counter_inc(link->master); | |
859 | } | |
860 | ||
861 | if (genpd->power_on) | |
862 | genpd->power_on(genpd); | |
863 | ||
864 | genpd->status = GPD_STATE_ACTIVE; | |
865 | } | |
866 | ||
4ecd6e65 RW |
867 | /** |
868 | * resume_needed - Check whether to resume a device before system suspend. | |
869 | * @dev: Device to check. | |
870 | * @genpd: PM domain the device belongs to. | |
871 | * | |
872 | * There are two cases in which a device that can wake up the system from sleep | |
873 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
874 | * to wake up the system and it has to remain active for this purpose while the | |
875 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
876 | * the system from sleep states and it generally doesn't generate wakeup signals | |
877 | * by itself (those signals are generated on its behalf by other parts of the | |
878 | * system). In the latter case it may be necessary to reconfigure the device's | |
879 | * wakeup settings during system suspend, because it may have been set up to | |
880 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
881 | * Return 'true' in either of the above cases. | |
882 | */ | |
883 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
884 | { | |
885 | bool active_wakeup; | |
886 | ||
887 | if (!device_can_wakeup(dev)) | |
888 | return false; | |
889 | ||
d5e4cbfe | 890 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
891 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
892 | } | |
893 | ||
596ba34b RW |
894 | /** |
895 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
896 | * @dev: Device to start the transition of. | |
897 | * | |
898 | * Start a power transition of a device (during a system-wide power transition) | |
899 | * under the assumption that its pm_domain field points to the domain member of | |
900 | * an object of type struct generic_pm_domain representing a PM domain | |
901 | * consisting of I/O devices. | |
902 | */ | |
903 | static int pm_genpd_prepare(struct device *dev) | |
904 | { | |
905 | struct generic_pm_domain *genpd; | |
b6c10c84 | 906 | int ret; |
596ba34b RW |
907 | |
908 | dev_dbg(dev, "%s()\n", __func__); | |
909 | ||
910 | genpd = dev_to_genpd(dev); | |
911 | if (IS_ERR(genpd)) | |
912 | return -EINVAL; | |
913 | ||
17b75eca RW |
914 | /* |
915 | * If a wakeup request is pending for the device, it should be woken up | |
916 | * at this point and a system wakeup event should be reported if it's | |
917 | * set up to wake up the system from sleep states. | |
918 | */ | |
919 | pm_runtime_get_noresume(dev); | |
920 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
921 | pm_wakeup_event(dev, 0); | |
922 | ||
923 | if (pm_wakeup_pending()) { | |
924 | pm_runtime_put_sync(dev); | |
925 | return -EBUSY; | |
926 | } | |
927 | ||
4ecd6e65 RW |
928 | if (resume_needed(dev, genpd)) |
929 | pm_runtime_resume(dev); | |
930 | ||
17b75eca | 931 | genpd_acquire_lock(genpd); |
596ba34b | 932 | |
65533bbf RW |
933 | if (genpd->prepared_count++ == 0) { |
934 | genpd->suspended_count = 0; | |
17b75eca | 935 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 936 | } |
17b75eca RW |
937 | |
938 | genpd_release_lock(genpd); | |
596ba34b RW |
939 | |
940 | if (genpd->suspend_power_off) { | |
17b75eca | 941 | pm_runtime_put_noidle(dev); |
596ba34b RW |
942 | return 0; |
943 | } | |
944 | ||
945 | /* | |
17b75eca RW |
946 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
947 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 948 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 949 | * to make it operational. |
596ba34b | 950 | */ |
17b75eca | 951 | pm_runtime_resume(dev); |
596ba34b RW |
952 | __pm_runtime_disable(dev, false); |
953 | ||
b6c10c84 RW |
954 | ret = pm_generic_prepare(dev); |
955 | if (ret) { | |
956 | mutex_lock(&genpd->lock); | |
957 | ||
958 | if (--genpd->prepared_count == 0) | |
959 | genpd->suspend_power_off = false; | |
960 | ||
961 | mutex_unlock(&genpd->lock); | |
17b75eca | 962 | pm_runtime_enable(dev); |
b6c10c84 | 963 | } |
17b75eca RW |
964 | |
965 | pm_runtime_put_sync(dev); | |
b6c10c84 | 966 | return ret; |
596ba34b RW |
967 | } |
968 | ||
969 | /** | |
970 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
971 | * @dev: Device to suspend. | |
972 | * | |
973 | * Suspend a device under the assumption that its pm_domain field points to the | |
974 | * domain member of an object of type struct generic_pm_domain representing | |
975 | * a PM domain consisting of I/O devices. | |
976 | */ | |
977 | static int pm_genpd_suspend(struct device *dev) | |
978 | { | |
979 | struct generic_pm_domain *genpd; | |
980 | ||
981 | dev_dbg(dev, "%s()\n", __func__); | |
982 | ||
983 | genpd = dev_to_genpd(dev); | |
984 | if (IS_ERR(genpd)) | |
985 | return -EINVAL; | |
986 | ||
d23b9b00 | 987 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
988 | } |
989 | ||
990 | /** | |
0496c8ae | 991 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
992 | * @dev: Device to suspend. |
993 | * | |
994 | * Carry out a late suspend of a device under the assumption that its | |
995 | * pm_domain field points to the domain member of an object of type | |
996 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
997 | */ | |
0496c8ae | 998 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
999 | { |
1000 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1001 | |
1002 | dev_dbg(dev, "%s()\n", __func__); | |
1003 | ||
1004 | genpd = dev_to_genpd(dev); | |
1005 | if (IS_ERR(genpd)) | |
1006 | return -EINVAL; | |
1007 | ||
0496c8ae RW |
1008 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
1009 | } | |
596ba34b | 1010 | |
0496c8ae RW |
1011 | /** |
1012 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
1013 | * @dev: Device to suspend. | |
1014 | * | |
1015 | * Stop the device and remove power from the domain if all devices in it have | |
1016 | * been stopped. | |
1017 | */ | |
1018 | static int pm_genpd_suspend_noirq(struct device *dev) | |
1019 | { | |
1020 | struct generic_pm_domain *genpd; | |
1021 | ||
1022 | dev_dbg(dev, "%s()\n", __func__); | |
1023 | ||
1024 | genpd = dev_to_genpd(dev); | |
1025 | if (IS_ERR(genpd)) | |
1026 | return -EINVAL; | |
596ba34b | 1027 | |
dbf37414 | 1028 | if (genpd->suspend_power_off |
0496c8ae | 1029 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1030 | return 0; |
1031 | ||
d5e4cbfe | 1032 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1033 | |
1034 | /* | |
1035 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1036 | * guaranteed that this function will never run twice in parallel for | |
1037 | * the same PM domain, so it is not necessary to use locking here. | |
1038 | */ | |
1039 | genpd->suspended_count++; | |
1040 | pm_genpd_sync_poweroff(genpd); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | /** | |
0496c8ae | 1046 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1047 | * @dev: Device to resume. |
1048 | * | |
0496c8ae | 1049 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1050 | */ |
1051 | static int pm_genpd_resume_noirq(struct device *dev) | |
1052 | { | |
1053 | struct generic_pm_domain *genpd; | |
1054 | ||
1055 | dev_dbg(dev, "%s()\n", __func__); | |
1056 | ||
1057 | genpd = dev_to_genpd(dev); | |
1058 | if (IS_ERR(genpd)) | |
1059 | return -EINVAL; | |
1060 | ||
dbf37414 | 1061 | if (genpd->suspend_power_off |
cc85b207 | 1062 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1063 | return 0; |
1064 | ||
1065 | /* | |
1066 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1067 | * guaranteed that this function will never run twice in parallel for | |
1068 | * the same PM domain, so it is not necessary to use locking here. | |
1069 | */ | |
802d8b49 | 1070 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1071 | genpd->suspended_count--; |
596ba34b | 1072 | |
0496c8ae | 1073 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1074 | } |
1075 | ||
1076 | /** | |
0496c8ae RW |
1077 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1078 | * @dev: Device to resume. | |
1079 | * | |
1080 | * Carry out an early resume of a device under the assumption that its | |
1081 | * pm_domain field points to the domain member of an object of type | |
1082 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1083 | * devices. | |
1084 | */ | |
1085 | static int pm_genpd_resume_early(struct device *dev) | |
1086 | { | |
1087 | struct generic_pm_domain *genpd; | |
1088 | ||
1089 | dev_dbg(dev, "%s()\n", __func__); | |
1090 | ||
1091 | genpd = dev_to_genpd(dev); | |
1092 | if (IS_ERR(genpd)) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); | |
1096 | } | |
1097 | ||
1098 | /** | |
1099 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1100 | * @dev: Device to resume. |
1101 | * | |
1102 | * Resume a device under the assumption that its pm_domain field points to the | |
1103 | * domain member of an object of type struct generic_pm_domain representing | |
1104 | * a power domain consisting of I/O devices. | |
1105 | */ | |
1106 | static int pm_genpd_resume(struct device *dev) | |
1107 | { | |
1108 | struct generic_pm_domain *genpd; | |
1109 | ||
1110 | dev_dbg(dev, "%s()\n", __func__); | |
1111 | ||
1112 | genpd = dev_to_genpd(dev); | |
1113 | if (IS_ERR(genpd)) | |
1114 | return -EINVAL; | |
1115 | ||
d23b9b00 | 1116 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
1117 | } |
1118 | ||
1119 | /** | |
0496c8ae | 1120 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1121 | * @dev: Device to freeze. |
1122 | * | |
1123 | * Freeze a device under the assumption that its pm_domain field points to the | |
1124 | * domain member of an object of type struct generic_pm_domain representing | |
1125 | * a power domain consisting of I/O devices. | |
1126 | */ | |
1127 | static int pm_genpd_freeze(struct device *dev) | |
1128 | { | |
1129 | struct generic_pm_domain *genpd; | |
1130 | ||
1131 | dev_dbg(dev, "%s()\n", __func__); | |
1132 | ||
1133 | genpd = dev_to_genpd(dev); | |
1134 | if (IS_ERR(genpd)) | |
1135 | return -EINVAL; | |
1136 | ||
d23b9b00 | 1137 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
1138 | } |
1139 | ||
1140 | /** | |
0496c8ae RW |
1141 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1142 | * @dev: Device to freeze. | |
1143 | * | |
1144 | * Carry out a late freeze of a device under the assumption that its | |
1145 | * pm_domain field points to the domain member of an object of type | |
1146 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1147 | * devices. | |
1148 | */ | |
1149 | static int pm_genpd_freeze_late(struct device *dev) | |
1150 | { | |
1151 | struct generic_pm_domain *genpd; | |
1152 | ||
1153 | dev_dbg(dev, "%s()\n", __func__); | |
1154 | ||
1155 | genpd = dev_to_genpd(dev); | |
1156 | if (IS_ERR(genpd)) | |
1157 | return -EINVAL; | |
1158 | ||
1159 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1164 | * @dev: Device to freeze. |
1165 | * | |
1166 | * Carry out a late freeze of a device under the assumption that its | |
1167 | * pm_domain field points to the domain member of an object of type | |
1168 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1169 | * devices. | |
1170 | */ | |
1171 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1172 | { | |
1173 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1174 | |
1175 | dev_dbg(dev, "%s()\n", __func__); | |
1176 | ||
1177 | genpd = dev_to_genpd(dev); | |
1178 | if (IS_ERR(genpd)) | |
1179 | return -EINVAL; | |
1180 | ||
dbf37414 | 1181 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1182 | } |
596ba34b | 1183 | |
0496c8ae RW |
1184 | /** |
1185 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1186 | * @dev: Device to thaw. | |
1187 | * | |
1188 | * Start the device, unless power has been removed from the domain already | |
1189 | * before the system transition. | |
1190 | */ | |
1191 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1192 | { | |
1193 | struct generic_pm_domain *genpd; | |
596ba34b | 1194 | |
0496c8ae | 1195 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1196 | |
0496c8ae RW |
1197 | genpd = dev_to_genpd(dev); |
1198 | if (IS_ERR(genpd)) | |
1199 | return -EINVAL; | |
1200 | ||
dbf37414 | 1201 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1202 | } |
1203 | ||
1204 | /** | |
0496c8ae | 1205 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1206 | * @dev: Device to thaw. |
1207 | * | |
1208 | * Carry out an early thaw of a device under the assumption that its | |
1209 | * pm_domain field points to the domain member of an object of type | |
1210 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1211 | * devices. | |
1212 | */ | |
0496c8ae | 1213 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1214 | { |
1215 | struct generic_pm_domain *genpd; | |
1216 | ||
1217 | dev_dbg(dev, "%s()\n", __func__); | |
1218 | ||
1219 | genpd = dev_to_genpd(dev); | |
1220 | if (IS_ERR(genpd)) | |
1221 | return -EINVAL; | |
1222 | ||
0496c8ae | 1223 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
596ba34b RW |
1224 | } |
1225 | ||
1226 | /** | |
1227 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1228 | * @dev: Device to thaw. | |
1229 | * | |
1230 | * Thaw a device under the assumption that its pm_domain field points to the | |
1231 | * domain member of an object of type struct generic_pm_domain representing | |
1232 | * a power domain consisting of I/O devices. | |
1233 | */ | |
1234 | static int pm_genpd_thaw(struct device *dev) | |
1235 | { | |
1236 | struct generic_pm_domain *genpd; | |
1237 | ||
1238 | dev_dbg(dev, "%s()\n", __func__); | |
1239 | ||
1240 | genpd = dev_to_genpd(dev); | |
1241 | if (IS_ERR(genpd)) | |
1242 | return -EINVAL; | |
1243 | ||
d23b9b00 | 1244 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1245 | } |
1246 | ||
1247 | /** | |
0496c8ae | 1248 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1249 | * @dev: Device to resume. |
1250 | * | |
0496c8ae RW |
1251 | * Make sure the domain will be in the same power state as before the |
1252 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1253 | */ |
1254 | static int pm_genpd_restore_noirq(struct device *dev) | |
1255 | { | |
1256 | struct generic_pm_domain *genpd; | |
1257 | ||
1258 | dev_dbg(dev, "%s()\n", __func__); | |
1259 | ||
1260 | genpd = dev_to_genpd(dev); | |
1261 | if (IS_ERR(genpd)) | |
1262 | return -EINVAL; | |
1263 | ||
1264 | /* | |
1265 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1266 | * guaranteed that this function will never run twice in parallel for | |
1267 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1268 | * |
1269 | * At this point suspended_count == 0 means we are being run for the | |
1270 | * first time for the given domain in the present cycle. | |
596ba34b | 1271 | */ |
65533bbf | 1272 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1273 | /* |
65533bbf | 1274 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1275 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1276 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1277 | */ |
65533bbf RW |
1278 | genpd->status = GPD_STATE_POWER_OFF; |
1279 | if (genpd->suspend_power_off) { | |
1280 | /* | |
1281 | * If the domain was off before the hibernation, make | |
1282 | * sure it will be off going forward. | |
1283 | */ | |
1284 | if (genpd->power_off) | |
1285 | genpd->power_off(genpd); | |
1286 | ||
1287 | return 0; | |
1288 | } | |
596ba34b RW |
1289 | } |
1290 | ||
18dd2ece RW |
1291 | if (genpd->suspend_power_off) |
1292 | return 0; | |
1293 | ||
802d8b49 | 1294 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1295 | |
dbf37414 | 1296 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1297 | } |
1298 | ||
1299 | /** | |
1300 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1301 | * @dev: Device to complete the transition of. | |
1302 | * | |
1303 | * Complete a power transition of a device (during a system-wide power | |
1304 | * transition) under the assumption that its pm_domain field points to the | |
1305 | * domain member of an object of type struct generic_pm_domain representing | |
1306 | * a power domain consisting of I/O devices. | |
1307 | */ | |
1308 | static void pm_genpd_complete(struct device *dev) | |
1309 | { | |
1310 | struct generic_pm_domain *genpd; | |
1311 | bool run_complete; | |
1312 | ||
1313 | dev_dbg(dev, "%s()\n", __func__); | |
1314 | ||
1315 | genpd = dev_to_genpd(dev); | |
1316 | if (IS_ERR(genpd)) | |
1317 | return; | |
1318 | ||
1319 | mutex_lock(&genpd->lock); | |
1320 | ||
1321 | run_complete = !genpd->suspend_power_off; | |
1322 | if (--genpd->prepared_count == 0) | |
1323 | genpd->suspend_power_off = false; | |
1324 | ||
1325 | mutex_unlock(&genpd->lock); | |
1326 | ||
1327 | if (run_complete) { | |
1328 | pm_generic_complete(dev); | |
6f00ff78 | 1329 | pm_runtime_set_active(dev); |
596ba34b | 1330 | pm_runtime_enable(dev); |
6f00ff78 | 1331 | pm_runtime_idle(dev); |
596ba34b RW |
1332 | } |
1333 | } | |
1334 | ||
77f827de RW |
1335 | /** |
1336 | * pm_genpd_syscore_switch - Switch power during system core suspend or resume. | |
1337 | * @dev: Device that normally is marked as "always on" to switch power for. | |
1338 | * | |
1339 | * This routine may only be called during the system core (syscore) suspend or | |
1340 | * resume phase for devices whose "always on" flags are set. | |
1341 | */ | |
1342 | void pm_genpd_syscore_switch(struct device *dev, bool suspend) | |
1343 | { | |
1344 | struct generic_pm_domain *genpd; | |
1345 | ||
1346 | genpd = dev_to_genpd(dev); | |
1347 | if (!pm_genpd_present(genpd)) | |
1348 | return; | |
1349 | ||
1350 | if (suspend) { | |
1351 | genpd->suspended_count++; | |
1352 | pm_genpd_sync_poweroff(genpd); | |
1353 | } else { | |
1354 | pm_genpd_sync_poweron(genpd); | |
1355 | genpd->suspended_count--; | |
1356 | } | |
1357 | } | |
1358 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch); | |
1359 | ||
596ba34b RW |
1360 | #else |
1361 | ||
1362 | #define pm_genpd_prepare NULL | |
1363 | #define pm_genpd_suspend NULL | |
0496c8ae | 1364 | #define pm_genpd_suspend_late NULL |
596ba34b | 1365 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1366 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1367 | #define pm_genpd_resume_noirq NULL |
1368 | #define pm_genpd_resume NULL | |
1369 | #define pm_genpd_freeze NULL | |
0496c8ae | 1370 | #define pm_genpd_freeze_late NULL |
596ba34b | 1371 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1372 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1373 | #define pm_genpd_thaw_noirq NULL |
1374 | #define pm_genpd_thaw NULL | |
596ba34b | 1375 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1376 | #define pm_genpd_complete NULL |
1377 | ||
1378 | #endif /* CONFIG_PM_SLEEP */ | |
1379 | ||
1d5fcfec RW |
1380 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1381 | { | |
1382 | struct generic_pm_domain_data *gpd_data; | |
1383 | ||
1384 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1385 | if (!gpd_data) | |
1386 | return NULL; | |
1387 | ||
1388 | mutex_init(&gpd_data->lock); | |
1389 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1390 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1391 | return gpd_data; | |
1392 | } | |
1393 | ||
1394 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1395 | struct generic_pm_domain_data *gpd_data) | |
1396 | { | |
1397 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1398 | kfree(gpd_data); | |
1399 | } | |
1400 | ||
f721889f | 1401 | /** |
b02c999a | 1402 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1403 | * @genpd: PM domain to add the device to. |
1404 | * @dev: Device to be added. | |
b02c999a | 1405 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1406 | */ |
b02c999a RW |
1407 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1408 | struct gpd_timing_data *td) | |
f721889f | 1409 | { |
1d5fcfec | 1410 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1411 | struct pm_domain_data *pdd; |
f721889f RW |
1412 | int ret = 0; |
1413 | ||
1414 | dev_dbg(dev, "%s()\n", __func__); | |
1415 | ||
1416 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1417 | return -EINVAL; | |
1418 | ||
1d5fcfec RW |
1419 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1420 | if (!gpd_data_new) | |
6ff7bb0d RW |
1421 | return -ENOMEM; |
1422 | ||
17b75eca | 1423 | genpd_acquire_lock(genpd); |
f721889f | 1424 | |
596ba34b RW |
1425 | if (genpd->prepared_count > 0) { |
1426 | ret = -EAGAIN; | |
1427 | goto out; | |
1428 | } | |
1429 | ||
4605ab65 RW |
1430 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1431 | if (pdd->dev == dev) { | |
f721889f RW |
1432 | ret = -EINVAL; |
1433 | goto out; | |
1434 | } | |
1435 | ||
1d5fcfec RW |
1436 | ret = dev_pm_get_subsys_data(dev); |
1437 | if (ret) | |
1438 | goto out; | |
1439 | ||
596ba34b | 1440 | genpd->device_count++; |
6ff7bb0d | 1441 | genpd->max_off_time_changed = true; |
f721889f | 1442 | |
6ff7bb0d | 1443 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1444 | |
6ff7bb0d | 1445 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1446 | if (dev->power.subsys_data->domain_data) { |
1447 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1448 | } else { | |
1449 | gpd_data = gpd_data_new; | |
1450 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1451 | } | |
1452 | gpd_data->refcount++; | |
b02c999a RW |
1453 | if (td) |
1454 | gpd_data->td = *td; | |
f721889f | 1455 | |
1d5fcfec RW |
1456 | spin_unlock_irq(&dev->power.lock); |
1457 | ||
1458 | mutex_lock(&gpd_data->lock); | |
1459 | gpd_data->base.dev = dev; | |
1460 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
1461 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; | |
6ff7bb0d RW |
1462 | gpd_data->td.constraint_changed = true; |
1463 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1464 | mutex_unlock(&gpd_data->lock); |
1465 | ||
f721889f | 1466 | out: |
17b75eca | 1467 | genpd_release_lock(genpd); |
f721889f | 1468 | |
1d5fcfec RW |
1469 | if (gpd_data != gpd_data_new) |
1470 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1471 | ||
f721889f RW |
1472 | return ret; |
1473 | } | |
1474 | ||
c8aa130b TA |
1475 | /** |
1476 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1477 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1478 | * the device is added to. | |
1479 | * @dev: Device to be added. | |
1480 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1481 | */ | |
1482 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1483 | struct gpd_timing_data *td) | |
1484 | { | |
1485 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1486 | ||
1487 | dev_dbg(dev, "%s()\n", __func__); | |
1488 | ||
1489 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1490 | return -EINVAL; | |
1491 | ||
1492 | mutex_lock(&gpd_list_lock); | |
1493 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1494 | if (gpd->of_node == genpd_node) { | |
1495 | genpd = gpd; | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | mutex_unlock(&gpd_list_lock); | |
1500 | ||
1501 | if (!genpd) | |
1502 | return -EINVAL; | |
1503 | ||
1504 | return __pm_genpd_add_device(genpd, dev, td); | |
1505 | } | |
1506 | ||
b5abb085 RW |
1507 | |
1508 | /** | |
1509 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1510 | * @domain_name: Name of the PM domain to add the device to. | |
1511 | * @dev: Device to be added. | |
1512 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1513 | */ | |
1514 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1515 | struct gpd_timing_data *td) | |
1516 | { | |
8bc0251d | 1517 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1518 | } |
1519 | ||
f721889f RW |
1520 | /** |
1521 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1522 | * @genpd: PM domain to remove the device from. | |
1523 | * @dev: Device to be removed. | |
1524 | */ | |
1525 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1526 | struct device *dev) | |
1527 | { | |
6ff7bb0d | 1528 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1529 | struct pm_domain_data *pdd; |
1d5fcfec | 1530 | bool remove = false; |
efa69025 | 1531 | int ret = 0; |
f721889f RW |
1532 | |
1533 | dev_dbg(dev, "%s()\n", __func__); | |
1534 | ||
efa69025 RW |
1535 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1536 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1537 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1538 | return -EINVAL; |
1539 | ||
17b75eca | 1540 | genpd_acquire_lock(genpd); |
f721889f | 1541 | |
596ba34b RW |
1542 | if (genpd->prepared_count > 0) { |
1543 | ret = -EAGAIN; | |
1544 | goto out; | |
1545 | } | |
1546 | ||
6ff7bb0d RW |
1547 | genpd->device_count--; |
1548 | genpd->max_off_time_changed = true; | |
1549 | ||
1550 | spin_lock_irq(&dev->power.lock); | |
1d5fcfec | 1551 | |
efa69025 RW |
1552 | dev->pm_domain = NULL; |
1553 | pdd = dev->power.subsys_data->domain_data; | |
1554 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1555 | gpd_data = to_gpd_data(pdd); |
1556 | if (--gpd_data->refcount == 0) { | |
1557 | dev->power.subsys_data->domain_data = NULL; | |
1558 | remove = true; | |
1559 | } | |
1560 | ||
6ff7bb0d | 1561 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1562 | |
6ff7bb0d RW |
1563 | mutex_lock(&gpd_data->lock); |
1564 | pdd->dev = NULL; | |
1565 | mutex_unlock(&gpd_data->lock); | |
1566 | ||
1567 | genpd_release_lock(genpd); | |
1568 | ||
6ff7bb0d | 1569 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1570 | if (remove) |
1571 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1572 | ||
6ff7bb0d | 1573 | return 0; |
f721889f | 1574 | |
596ba34b | 1575 | out: |
17b75eca | 1576 | genpd_release_lock(genpd); |
f721889f RW |
1577 | |
1578 | return ret; | |
1579 | } | |
1580 | ||
ca1d72f0 RW |
1581 | /** |
1582 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1583 | * @dev: Device to set/unset the flag for. | |
1584 | * @val: The new value of the device's "need restore" flag. | |
1585 | */ | |
1586 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1587 | { | |
1588 | struct pm_subsys_data *psd; | |
1589 | unsigned long flags; | |
1590 | ||
1591 | spin_lock_irqsave(&dev->power.lock, flags); | |
1592 | ||
1593 | psd = dev_to_psd(dev); | |
1594 | if (psd && psd->domain_data) | |
1595 | to_gpd_data(psd->domain_data)->need_restore = val; | |
1596 | ||
1597 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1598 | } | |
1599 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1600 | ||
f721889f RW |
1601 | /** |
1602 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1603 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1604 | * @subdomain: Subdomain to be added. |
f721889f RW |
1605 | */ |
1606 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1607 | struct generic_pm_domain *subdomain) |
f721889f | 1608 | { |
5063ce15 | 1609 | struct gpd_link *link; |
f721889f RW |
1610 | int ret = 0; |
1611 | ||
fb7268be RW |
1612 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1613 | || genpd == subdomain) | |
f721889f RW |
1614 | return -EINVAL; |
1615 | ||
17b75eca RW |
1616 | start: |
1617 | genpd_acquire_lock(genpd); | |
bc0403ff | 1618 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1619 | |
bc0403ff RW |
1620 | if (subdomain->status != GPD_STATE_POWER_OFF |
1621 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1622 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1623 | genpd_release_lock(genpd); |
1624 | goto start; | |
1625 | } | |
1626 | ||
1627 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1628 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1629 | ret = -EINVAL; |
1630 | goto out; | |
1631 | } | |
1632 | ||
4fcac10d | 1633 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1634 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1635 | ret = -EINVAL; |
1636 | goto out; | |
1637 | } | |
1638 | } | |
1639 | ||
5063ce15 RW |
1640 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1641 | if (!link) { | |
1642 | ret = -ENOMEM; | |
1643 | goto out; | |
1644 | } | |
1645 | link->master = genpd; | |
1646 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1647 | link->slave = subdomain; |
1648 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1649 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1650 | genpd_sd_counter_inc(genpd); |
f721889f | 1651 | |
f721889f | 1652 | out: |
bc0403ff | 1653 | mutex_unlock(&subdomain->lock); |
17b75eca | 1654 | genpd_release_lock(genpd); |
f721889f RW |
1655 | |
1656 | return ret; | |
1657 | } | |
1658 | ||
fb7268be RW |
1659 | /** |
1660 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1661 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1662 | * @subdomain_name: Name of the subdomain to be added. | |
1663 | */ | |
1664 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1665 | const char *subdomain_name) | |
1666 | { | |
1667 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1668 | ||
1669 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1670 | return -EINVAL; | |
1671 | ||
1672 | mutex_lock(&gpd_list_lock); | |
1673 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1674 | if (!master && !strcmp(gpd->name, master_name)) | |
1675 | master = gpd; | |
1676 | ||
1677 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1678 | subdomain = gpd; | |
1679 | ||
1680 | if (master && subdomain) | |
1681 | break; | |
1682 | } | |
1683 | mutex_unlock(&gpd_list_lock); | |
1684 | ||
1685 | return pm_genpd_add_subdomain(master, subdomain); | |
1686 | } | |
1687 | ||
f721889f RW |
1688 | /** |
1689 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1690 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1691 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1692 | */ |
1693 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1694 | struct generic_pm_domain *subdomain) |
f721889f | 1695 | { |
5063ce15 | 1696 | struct gpd_link *link; |
f721889f RW |
1697 | int ret = -EINVAL; |
1698 | ||
5063ce15 | 1699 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1700 | return -EINVAL; |
1701 | ||
17b75eca RW |
1702 | start: |
1703 | genpd_acquire_lock(genpd); | |
f721889f | 1704 | |
5063ce15 RW |
1705 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1706 | if (link->slave != subdomain) | |
f721889f RW |
1707 | continue; |
1708 | ||
1709 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1710 | ||
17b75eca RW |
1711 | if (subdomain->status != GPD_STATE_POWER_OFF |
1712 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1713 | mutex_unlock(&subdomain->lock); | |
1714 | genpd_release_lock(genpd); | |
1715 | goto start; | |
1716 | } | |
1717 | ||
5063ce15 RW |
1718 | list_del(&link->master_node); |
1719 | list_del(&link->slave_node); | |
1720 | kfree(link); | |
17b75eca | 1721 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1722 | genpd_sd_counter_dec(genpd); |
1723 | ||
1724 | mutex_unlock(&subdomain->lock); | |
1725 | ||
1726 | ret = 0; | |
1727 | break; | |
1728 | } | |
1729 | ||
17b75eca | 1730 | genpd_release_lock(genpd); |
f721889f RW |
1731 | |
1732 | return ret; | |
1733 | } | |
1734 | ||
d5e4cbfe RW |
1735 | /** |
1736 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1737 | * @dev: Device to add the callbacks to. | |
1738 | * @ops: Set of callbacks to add. | |
b02c999a | 1739 | * @td: Timing data to add to the device along with the callbacks (optional). |
62d44902 RW |
1740 | * |
1741 | * Every call to this routine should be balanced with a call to | |
1742 | * __pm_genpd_remove_callbacks() and they must not be nested. | |
d5e4cbfe | 1743 | */ |
b02c999a RW |
1744 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1745 | struct gpd_timing_data *td) | |
d5e4cbfe | 1746 | { |
62d44902 | 1747 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
d5e4cbfe RW |
1748 | int ret = 0; |
1749 | ||
62d44902 | 1750 | if (!(dev && ops)) |
d5e4cbfe RW |
1751 | return -EINVAL; |
1752 | ||
62d44902 RW |
1753 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1754 | if (!gpd_data_new) | |
1755 | return -ENOMEM; | |
1756 | ||
d5e4cbfe RW |
1757 | pm_runtime_disable(dev); |
1758 | device_pm_lock(); | |
1759 | ||
62d44902 RW |
1760 | ret = dev_pm_get_subsys_data(dev); |
1761 | if (ret) | |
1762 | goto out; | |
1763 | ||
1764 | spin_lock_irq(&dev->power.lock); | |
d5e4cbfe | 1765 | |
62d44902 RW |
1766 | if (dev->power.subsys_data->domain_data) { |
1767 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
d5e4cbfe | 1768 | } else { |
62d44902 RW |
1769 | gpd_data = gpd_data_new; |
1770 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
d5e4cbfe | 1771 | } |
62d44902 RW |
1772 | gpd_data->refcount++; |
1773 | gpd_data->ops = *ops; | |
1774 | if (td) | |
1775 | gpd_data->td = *td; | |
d5e4cbfe | 1776 | |
62d44902 RW |
1777 | spin_unlock_irq(&dev->power.lock); |
1778 | ||
1779 | out: | |
d5e4cbfe RW |
1780 | device_pm_unlock(); |
1781 | pm_runtime_enable(dev); | |
1782 | ||
62d44902 RW |
1783 | if (gpd_data != gpd_data_new) |
1784 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1785 | ||
d5e4cbfe RW |
1786 | return ret; |
1787 | } | |
1788 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1789 | ||
1790 | /** | |
b02c999a | 1791 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1792 | * @dev: Device to remove the callbacks from. |
b02c999a | 1793 | * @clear_td: If set, clear the device's timing data too. |
62d44902 RW |
1794 | * |
1795 | * This routine can only be called after pm_genpd_add_callbacks(). | |
d5e4cbfe | 1796 | */ |
b02c999a | 1797 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe | 1798 | { |
62d44902 RW |
1799 | struct generic_pm_domain_data *gpd_data = NULL; |
1800 | bool remove = false; | |
d5e4cbfe RW |
1801 | int ret = 0; |
1802 | ||
1803 | if (!(dev && dev->power.subsys_data)) | |
1804 | return -EINVAL; | |
1805 | ||
1806 | pm_runtime_disable(dev); | |
1807 | device_pm_lock(); | |
1808 | ||
62d44902 | 1809 | spin_lock_irq(&dev->power.lock); |
d5e4cbfe | 1810 | |
62d44902 RW |
1811 | if (dev->power.subsys_data->domain_data) { |
1812 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
db79e53d | 1813 | gpd_data->ops = (struct gpd_dev_ops){ NULL }; |
b02c999a RW |
1814 | if (clear_td) |
1815 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
62d44902 RW |
1816 | |
1817 | if (--gpd_data->refcount == 0) { | |
1818 | dev->power.subsys_data->domain_data = NULL; | |
1819 | remove = true; | |
1820 | } | |
d5e4cbfe RW |
1821 | } else { |
1822 | ret = -EINVAL; | |
1823 | } | |
1824 | ||
62d44902 RW |
1825 | spin_unlock_irq(&dev->power.lock); |
1826 | ||
d5e4cbfe RW |
1827 | device_pm_unlock(); |
1828 | pm_runtime_enable(dev); | |
1829 | ||
62d44902 RW |
1830 | if (ret) |
1831 | return ret; | |
1832 | ||
1833 | dev_pm_put_subsys_data(dev); | |
1834 | if (remove) | |
1835 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1836 | ||
1837 | return 0; | |
d5e4cbfe | 1838 | } |
b02c999a | 1839 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1840 | |
40114447 RW |
1841 | /** |
1842 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1843 | * @genpd: PM domain to be connected with cpuidle. | |
1844 | * @state: cpuidle state this domain can disable/enable. | |
1845 | * | |
1846 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1847 | * of calling its power down routine it will enable the given cpuidle state so | |
1848 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1849 | */ | |
1850 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1851 | { |
1852 | struct cpuidle_driver *cpuidle_drv; | |
1853 | struct gpd_cpu_data *cpu_data; | |
1854 | struct cpuidle_state *idle_state; | |
1855 | int ret = 0; | |
1856 | ||
1857 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1858 | return -EINVAL; | |
1859 | ||
1860 | genpd_acquire_lock(genpd); | |
1861 | ||
1862 | if (genpd->cpu_data) { | |
1863 | ret = -EEXIST; | |
1864 | goto out; | |
1865 | } | |
1866 | cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); | |
1867 | if (!cpu_data) { | |
1868 | ret = -ENOMEM; | |
1869 | goto out; | |
1870 | } | |
1871 | cpuidle_drv = cpuidle_driver_ref(); | |
1872 | if (!cpuidle_drv) { | |
1873 | ret = -ENODEV; | |
debe081a | 1874 | goto err_drv; |
cbc9ef02 RW |
1875 | } |
1876 | if (cpuidle_drv->state_count <= state) { | |
1877 | ret = -EINVAL; | |
1878 | goto err; | |
1879 | } | |
1880 | idle_state = &cpuidle_drv->states[state]; | |
1881 | if (!idle_state->disabled) { | |
1882 | ret = -EAGAIN; | |
1883 | goto err; | |
1884 | } | |
1885 | cpu_data->idle_state = idle_state; | |
1886 | cpu_data->saved_exit_latency = idle_state->exit_latency; | |
1887 | genpd->cpu_data = cpu_data; | |
1888 | genpd_recalc_cpu_exit_latency(genpd); | |
1889 | ||
1890 | out: | |
1891 | genpd_release_lock(genpd); | |
1892 | return ret; | |
1893 | ||
1894 | err: | |
1895 | cpuidle_driver_unref(); | |
debe081a | 1896 | |
1897 | err_drv: | |
1898 | kfree(cpu_data); | |
cbc9ef02 RW |
1899 | goto out; |
1900 | } | |
1901 | ||
74a2799a RW |
1902 | /** |
1903 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1904 | * @name: Name of the domain to connect to cpuidle. | |
1905 | * @state: cpuidle state this domain can manipulate. | |
1906 | */ | |
1907 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1908 | { | |
1909 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1910 | } | |
1911 | ||
40114447 RW |
1912 | /** |
1913 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1914 | * @genpd: PM domain to remove the cpuidle connection from. | |
1915 | * | |
1916 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1917 | * given PM domain. | |
1918 | */ | |
1919 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 RW |
1920 | { |
1921 | struct gpd_cpu_data *cpu_data; | |
1922 | struct cpuidle_state *idle_state; | |
1923 | int ret = 0; | |
1924 | ||
1925 | if (IS_ERR_OR_NULL(genpd)) | |
1926 | return -EINVAL; | |
1927 | ||
1928 | genpd_acquire_lock(genpd); | |
1929 | ||
1930 | cpu_data = genpd->cpu_data; | |
1931 | if (!cpu_data) { | |
1932 | ret = -ENODEV; | |
1933 | goto out; | |
1934 | } | |
1935 | idle_state = cpu_data->idle_state; | |
1936 | if (!idle_state->disabled) { | |
1937 | ret = -EAGAIN; | |
1938 | goto out; | |
1939 | } | |
1940 | idle_state->exit_latency = cpu_data->saved_exit_latency; | |
1941 | cpuidle_driver_unref(); | |
1942 | genpd->cpu_data = NULL; | |
1943 | kfree(cpu_data); | |
1944 | ||
1945 | out: | |
1946 | genpd_release_lock(genpd); | |
1947 | return ret; | |
1948 | } | |
1949 | ||
74a2799a RW |
1950 | /** |
1951 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1952 | * @name: Name of the domain to disconnect cpuidle from. | |
1953 | */ | |
1954 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1955 | { | |
1956 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1957 | } | |
1958 | ||
d23b9b00 RW |
1959 | /* Default device callbacks for generic PM domains. */ |
1960 | ||
ecf00475 RW |
1961 | /** |
1962 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1963 | * @dev: Device to handle. | |
1964 | */ | |
1965 | static int pm_genpd_default_save_state(struct device *dev) | |
1966 | { | |
1967 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1968 | |
1969 | cb = dev_gpd_data(dev)->ops.save_state; | |
1970 | if (cb) | |
1971 | return cb(dev); | |
1972 | ||
0b589741 RW |
1973 | if (dev->type && dev->type->pm) |
1974 | cb = dev->type->pm->runtime_suspend; | |
1975 | else if (dev->class && dev->class->pm) | |
1976 | cb = dev->class->pm->runtime_suspend; | |
1977 | else if (dev->bus && dev->bus->pm) | |
1978 | cb = dev->bus->pm->runtime_suspend; | |
1979 | else | |
1980 | cb = NULL; | |
ecf00475 | 1981 | |
0b589741 RW |
1982 | if (!cb && dev->driver && dev->driver->pm) |
1983 | cb = dev->driver->pm->runtime_suspend; | |
1984 | ||
1985 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1986 | } |
1987 | ||
1988 | /** | |
1989 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1990 | * @dev: Device to handle. | |
1991 | */ | |
1992 | static int pm_genpd_default_restore_state(struct device *dev) | |
1993 | { | |
1994 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1995 | |
1996 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1997 | if (cb) | |
1998 | return cb(dev); | |
1999 | ||
0b589741 RW |
2000 | if (dev->type && dev->type->pm) |
2001 | cb = dev->type->pm->runtime_resume; | |
2002 | else if (dev->class && dev->class->pm) | |
2003 | cb = dev->class->pm->runtime_resume; | |
2004 | else if (dev->bus && dev->bus->pm) | |
2005 | cb = dev->bus->pm->runtime_resume; | |
2006 | else | |
2007 | cb = NULL; | |
ecf00475 | 2008 | |
0b589741 RW |
2009 | if (!cb && dev->driver && dev->driver->pm) |
2010 | cb = dev->driver->pm->runtime_resume; | |
2011 | ||
2012 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
2013 | } |
2014 | ||
0f1d6986 RW |
2015 | #ifdef CONFIG_PM_SLEEP |
2016 | ||
d23b9b00 RW |
2017 | /** |
2018 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
2019 | * @dev: Device to handle. | |
2020 | */ | |
2021 | static int pm_genpd_default_suspend(struct device *dev) | |
2022 | { | |
c9914854 | 2023 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
d23b9b00 RW |
2024 | |
2025 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
2030 | * @dev: Device to handle. | |
2031 | */ | |
2032 | static int pm_genpd_default_suspend_late(struct device *dev) | |
2033 | { | |
c9914854 | 2034 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
d23b9b00 | 2035 | |
0496c8ae | 2036 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
d23b9b00 RW |
2037 | } |
2038 | ||
2039 | /** | |
2040 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
2041 | * @dev: Device to handle. | |
2042 | */ | |
2043 | static int pm_genpd_default_resume_early(struct device *dev) | |
2044 | { | |
c9914854 | 2045 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
d23b9b00 | 2046 | |
0496c8ae | 2047 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
d23b9b00 RW |
2048 | } |
2049 | ||
2050 | /** | |
2051 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
2052 | * @dev: Device to handle. | |
2053 | */ | |
2054 | static int pm_genpd_default_resume(struct device *dev) | |
2055 | { | |
c9914854 | 2056 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
d23b9b00 RW |
2057 | |
2058 | return cb ? cb(dev) : pm_generic_resume(dev); | |
2059 | } | |
2060 | ||
2061 | /** | |
2062 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
2063 | * @dev: Device to handle. | |
2064 | */ | |
2065 | static int pm_genpd_default_freeze(struct device *dev) | |
2066 | { | |
2067 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
2068 | ||
2069 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
2070 | } | |
2071 | ||
2072 | /** | |
2073 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
2074 | * @dev: Device to handle. | |
2075 | */ | |
2076 | static int pm_genpd_default_freeze_late(struct device *dev) | |
2077 | { | |
2078 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
2079 | ||
0496c8ae | 2080 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
d23b9b00 RW |
2081 | } |
2082 | ||
2083 | /** | |
2084 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
2085 | * @dev: Device to handle. | |
2086 | */ | |
2087 | static int pm_genpd_default_thaw_early(struct device *dev) | |
2088 | { | |
2089 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
2090 | ||
0496c8ae | 2091 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
d23b9b00 RW |
2092 | } |
2093 | ||
2094 | /** | |
2095 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
2096 | * @dev: Device to handle. | |
2097 | */ | |
2098 | static int pm_genpd_default_thaw(struct device *dev) | |
2099 | { | |
2100 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
2101 | ||
2102 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
2103 | } | |
2104 | ||
0f1d6986 RW |
2105 | #else /* !CONFIG_PM_SLEEP */ |
2106 | ||
2107 | #define pm_genpd_default_suspend NULL | |
2108 | #define pm_genpd_default_suspend_late NULL | |
2109 | #define pm_genpd_default_resume_early NULL | |
2110 | #define pm_genpd_default_resume NULL | |
2111 | #define pm_genpd_default_freeze NULL | |
2112 | #define pm_genpd_default_freeze_late NULL | |
2113 | #define pm_genpd_default_thaw_early NULL | |
2114 | #define pm_genpd_default_thaw NULL | |
2115 | ||
2116 | #endif /* !CONFIG_PM_SLEEP */ | |
2117 | ||
f721889f RW |
2118 | /** |
2119 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
2120 | * @genpd: PM domain object to initialize. | |
2121 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
2122 | * @is_off: Initial value of the domain's power_is_off field. | |
2123 | */ | |
2124 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
2125 | struct dev_power_governor *gov, bool is_off) | |
2126 | { | |
2127 | if (IS_ERR_OR_NULL(genpd)) | |
2128 | return; | |
2129 | ||
5063ce15 RW |
2130 | INIT_LIST_HEAD(&genpd->master_links); |
2131 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 2132 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
2133 | mutex_init(&genpd->lock); |
2134 | genpd->gov = gov; | |
2135 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
2136 | genpd->in_progress = 0; | |
c4bb3160 | 2137 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
2138 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
2139 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
2140 | genpd->poweroff_task = NULL; |
2141 | genpd->resume_count = 0; | |
596ba34b | 2142 | genpd->device_count = 0; |
221e9b58 | 2143 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 2144 | genpd->max_off_time_changed = true; |
f721889f RW |
2145 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
2146 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
2147 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
2148 | genpd->domain.ops.prepare = pm_genpd_prepare; |
2149 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 2150 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
2151 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
2152 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 2153 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
2154 | genpd->domain.ops.resume = pm_genpd_resume; |
2155 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 2156 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
2157 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
2158 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 2159 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 2160 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 2161 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 2162 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 2163 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 2164 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 2165 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 2166 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 2167 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
2168 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
2169 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c9914854 RW |
2170 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
2171 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; | |
2172 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; | |
2173 | genpd->dev_ops.resume = pm_genpd_default_resume; | |
d23b9b00 RW |
2174 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
2175 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
2176 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
2177 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
2178 | mutex_lock(&gpd_list_lock); |
2179 | list_add(&genpd->gpd_list_node, &gpd_list); | |
2180 | mutex_unlock(&gpd_list_lock); | |
2181 | } |