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