Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/io.h> | |
12 | #include <linux/pm_runtime.h> | |
13 | #include <linux/pm_domain.h> | |
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 | ||
5248051b RW |
56 | #ifdef CONFIG_PM |
57 | ||
b02c999a | 58 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
59 | { |
60 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
61 | return ERR_PTR(-EINVAL); | |
62 | ||
596ba34b | 63 | return pd_to_genpd(dev->pm_domain); |
5248051b | 64 | } |
f721889f | 65 | |
d5e4cbfe RW |
66 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
67 | { | |
0140d8bd RW |
68 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
69 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
70 | } |
71 | ||
72 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
73 | { | |
0140d8bd RW |
74 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
75 | start_latency_ns, "start"); | |
d5e4cbfe RW |
76 | } |
77 | ||
ecf00475 RW |
78 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
79 | { | |
0140d8bd RW |
80 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, |
81 | save_state_latency_ns, "state save"); | |
ecf00475 RW |
82 | } |
83 | ||
84 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
85 | { | |
0140d8bd RW |
86 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
87 | restore_state_latency_ns, | |
88 | "state restore"); | |
ecf00475 RW |
89 | } |
90 | ||
c4bb3160 | 91 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 92 | { |
c4bb3160 RW |
93 | bool ret = false; |
94 | ||
95 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
96 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
102 | { | |
103 | atomic_inc(&genpd->sd_count); | |
104 | smp_mb__after_atomic_inc(); | |
f721889f RW |
105 | } |
106 | ||
17b75eca RW |
107 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
108 | { | |
109 | DEFINE_WAIT(wait); | |
110 | ||
111 | mutex_lock(&genpd->lock); | |
112 | /* | |
113 | * Wait for the domain to transition into either the active, | |
114 | * or the power off state. | |
115 | */ | |
116 | for (;;) { | |
117 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
118 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
119 | if (genpd->status == GPD_STATE_ACTIVE |
120 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
121 | break; |
122 | mutex_unlock(&genpd->lock); | |
123 | ||
124 | schedule(); | |
125 | ||
126 | mutex_lock(&genpd->lock); | |
127 | } | |
128 | finish_wait(&genpd->status_wait_queue, &wait); | |
129 | } | |
130 | ||
131 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
132 | { | |
133 | mutex_unlock(&genpd->lock); | |
134 | } | |
135 | ||
c6d22b37 RW |
136 | static void genpd_set_active(struct generic_pm_domain *genpd) |
137 | { | |
138 | if (genpd->resume_count == 0) | |
139 | genpd->status = GPD_STATE_ACTIVE; | |
140 | } | |
141 | ||
cbc9ef02 RW |
142 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
143 | { | |
144 | s64 usecs64; | |
145 | ||
146 | if (!genpd->cpu_data) | |
147 | return; | |
148 | ||
149 | usecs64 = genpd->power_on_latency_ns; | |
150 | do_div(usecs64, NSEC_PER_USEC); | |
151 | usecs64 += genpd->cpu_data->saved_exit_latency; | |
152 | genpd->cpu_data->idle_state->exit_latency = usecs64; | |
153 | } | |
154 | ||
5248051b | 155 | /** |
5063ce15 | 156 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
157 | * @genpd: PM domain to power up. |
158 | * | |
5063ce15 | 159 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
160 | * resume a device belonging to it. |
161 | */ | |
3f241775 RW |
162 | int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
163 | __releases(&genpd->lock) __acquires(&genpd->lock) | |
5248051b | 164 | { |
5063ce15 | 165 | struct gpd_link *link; |
3f241775 | 166 | DEFINE_WAIT(wait); |
5248051b RW |
167 | int ret = 0; |
168 | ||
5063ce15 | 169 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
170 | for (;;) { |
171 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
172 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 173 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
174 | break; |
175 | mutex_unlock(&genpd->lock); | |
17b75eca | 176 | |
3f241775 RW |
177 | schedule(); |
178 | ||
179 | mutex_lock(&genpd->lock); | |
180 | } | |
181 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 182 | |
17b75eca | 183 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 184 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 185 | return 0; |
5248051b | 186 | |
c6d22b37 RW |
187 | if (genpd->status != GPD_STATE_POWER_OFF) { |
188 | genpd_set_active(genpd); | |
3f241775 | 189 | return 0; |
c6d22b37 RW |
190 | } |
191 | ||
cbc9ef02 RW |
192 | if (genpd->cpu_data) { |
193 | cpuidle_pause_and_lock(); | |
194 | genpd->cpu_data->idle_state->disabled = true; | |
195 | cpuidle_resume_and_unlock(); | |
196 | goto out; | |
197 | } | |
198 | ||
5063ce15 RW |
199 | /* |
200 | * The list is guaranteed not to change while the loop below is being | |
201 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
202 | * with it. | |
203 | */ | |
204 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
205 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 206 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 207 | |
5248051b | 208 | mutex_unlock(&genpd->lock); |
5248051b | 209 | |
5063ce15 | 210 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
211 | |
212 | mutex_lock(&genpd->lock); | |
213 | ||
3f241775 RW |
214 | /* |
215 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 216 | * while the master is powering on. |
3f241775 RW |
217 | */ |
218 | genpd->status = GPD_STATE_POWER_OFF; | |
219 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
220 | if (ret) { |
221 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 222 | goto err; |
5063ce15 | 223 | } |
5248051b RW |
224 | } |
225 | ||
9e08cf42 | 226 | if (genpd->power_on) { |
0140d8bd RW |
227 | ktime_t time_start = ktime_get(); |
228 | s64 elapsed_ns; | |
229 | ||
fe202fde | 230 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
231 | if (ret) |
232 | goto err; | |
0140d8bd RW |
233 | |
234 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 235 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 236 | genpd->power_on_latency_ns = elapsed_ns; |
6ff7bb0d | 237 | genpd->max_off_time_changed = true; |
cbc9ef02 | 238 | genpd_recalc_cpu_exit_latency(genpd); |
e84b2c20 RW |
239 | if (genpd->name) |
240 | pr_warning("%s: Power-on latency exceeded, " | |
241 | "new value %lld ns\n", genpd->name, | |
242 | elapsed_ns); | |
243 | } | |
3c07cbc4 | 244 | } |
5248051b | 245 | |
cbc9ef02 | 246 | out: |
9e08cf42 RW |
247 | genpd_set_active(genpd); |
248 | ||
3f241775 | 249 | return 0; |
9e08cf42 RW |
250 | |
251 | err: | |
5063ce15 RW |
252 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
253 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 254 | |
3f241775 RW |
255 | return ret; |
256 | } | |
257 | ||
258 | /** | |
5063ce15 | 259 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
260 | * @genpd: PM domain to power up. |
261 | */ | |
262 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
263 | { | |
264 | int ret; | |
265 | ||
266 | mutex_lock(&genpd->lock); | |
267 | ret = __pm_genpd_poweron(genpd); | |
268 | mutex_unlock(&genpd->lock); | |
269 | return ret; | |
5248051b RW |
270 | } |
271 | ||
272 | #endif /* CONFIG_PM */ | |
273 | ||
274 | #ifdef CONFIG_PM_RUNTIME | |
275 | ||
6ff7bb0d RW |
276 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
277 | unsigned long val, void *ptr) | |
278 | { | |
279 | struct generic_pm_domain_data *gpd_data; | |
280 | struct device *dev; | |
281 | ||
282 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
283 | ||
284 | mutex_lock(&gpd_data->lock); | |
285 | dev = gpd_data->base.dev; | |
286 | if (!dev) { | |
287 | mutex_unlock(&gpd_data->lock); | |
288 | return NOTIFY_DONE; | |
289 | } | |
290 | mutex_unlock(&gpd_data->lock); | |
291 | ||
292 | for (;;) { | |
293 | struct generic_pm_domain *genpd; | |
294 | struct pm_domain_data *pdd; | |
295 | ||
296 | spin_lock_irq(&dev->power.lock); | |
297 | ||
298 | pdd = dev->power.subsys_data ? | |
299 | dev->power.subsys_data->domain_data : NULL; | |
300 | if (pdd) { | |
301 | to_gpd_data(pdd)->td.constraint_changed = true; | |
302 | genpd = dev_to_genpd(dev); | |
303 | } else { | |
304 | genpd = ERR_PTR(-ENODATA); | |
305 | } | |
306 | ||
307 | spin_unlock_irq(&dev->power.lock); | |
308 | ||
309 | if (!IS_ERR(genpd)) { | |
310 | mutex_lock(&genpd->lock); | |
311 | genpd->max_off_time_changed = true; | |
312 | mutex_unlock(&genpd->lock); | |
313 | } | |
314 | ||
315 | dev = dev->parent; | |
316 | if (!dev || dev->power.ignore_children) | |
317 | break; | |
318 | } | |
319 | ||
320 | return NOTIFY_DONE; | |
321 | } | |
322 | ||
f721889f RW |
323 | /** |
324 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 325 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
326 | * @genpd: PM domain the device belongs to. |
327 | */ | |
4605ab65 | 328 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 329 | struct generic_pm_domain *genpd) |
17b75eca | 330 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 331 | { |
cd0ea672 | 332 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 333 | struct device *dev = pdd->dev; |
f721889f RW |
334 | int ret = 0; |
335 | ||
cd0ea672 | 336 | if (gpd_data->need_restore) |
f721889f RW |
337 | return 0; |
338 | ||
17b75eca RW |
339 | mutex_unlock(&genpd->lock); |
340 | ||
ecf00475 RW |
341 | genpd_start_dev(genpd, dev); |
342 | ret = genpd_save_dev(genpd, dev); | |
343 | genpd_stop_dev(genpd, dev); | |
f721889f | 344 | |
17b75eca RW |
345 | mutex_lock(&genpd->lock); |
346 | ||
f721889f | 347 | if (!ret) |
cd0ea672 | 348 | gpd_data->need_restore = true; |
f721889f RW |
349 | |
350 | return ret; | |
351 | } | |
352 | ||
353 | /** | |
354 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 355 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
356 | * @genpd: PM domain the device belongs to. |
357 | */ | |
4605ab65 | 358 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 359 | struct generic_pm_domain *genpd) |
17b75eca | 360 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 361 | { |
cd0ea672 | 362 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 363 | struct device *dev = pdd->dev; |
80de3d7f | 364 | bool need_restore = gpd_data->need_restore; |
f721889f | 365 | |
80de3d7f | 366 | gpd_data->need_restore = false; |
17b75eca RW |
367 | mutex_unlock(&genpd->lock); |
368 | ||
ecf00475 | 369 | genpd_start_dev(genpd, dev); |
80de3d7f RW |
370 | if (need_restore) |
371 | genpd_restore_dev(genpd, dev); | |
f721889f | 372 | |
17b75eca | 373 | mutex_lock(&genpd->lock); |
f721889f RW |
374 | } |
375 | ||
c6d22b37 RW |
376 | /** |
377 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
378 | * @genpd: PM domain to check. | |
379 | * | |
380 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
381 | * a "power off" operation, which means that a "power on" has occured in the | |
382 | * meantime, or if its resume_count field is different from zero, which means | |
383 | * that one of its devices has been resumed in the meantime. | |
384 | */ | |
385 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
386 | { | |
17877eb5 | 387 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 388 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
389 | } |
390 | ||
56375fd4 RW |
391 | /** |
392 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
393 | * @genpd: PM domait to power off. | |
394 | * | |
395 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
396 | * before. | |
397 | */ | |
0bc5b2de | 398 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 RW |
399 | { |
400 | if (!work_pending(&genpd->power_off_work)) | |
401 | queue_work(pm_wq, &genpd->power_off_work); | |
402 | } | |
403 | ||
f721889f RW |
404 | /** |
405 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
406 | * @genpd: PM domain to power down. | |
407 | * | |
408 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
409 | * have been powered down, run the runtime suspend callbacks provided by all of | |
410 | * the @genpd's devices' drivers and remove power from @genpd. | |
411 | */ | |
412 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 413 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 414 | { |
4605ab65 | 415 | struct pm_domain_data *pdd; |
5063ce15 | 416 | struct gpd_link *link; |
f721889f | 417 | unsigned int not_suspended; |
c6d22b37 | 418 | int ret = 0; |
f721889f | 419 | |
c6d22b37 RW |
420 | start: |
421 | /* | |
422 | * Do not try to power off the domain in the following situations: | |
423 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 424 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 425 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 426 | * (4) System suspend is in progress. |
c6d22b37 | 427 | */ |
3f241775 | 428 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 429 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 430 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
431 | return 0; |
432 | ||
c4bb3160 | 433 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
434 | return -EBUSY; |
435 | ||
436 | not_suspended = 0; | |
4605ab65 | 437 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
0aa2a221 | 438 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
1e78a0c7 | 439 | || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on)) |
f721889f RW |
440 | not_suspended++; |
441 | ||
442 | if (not_suspended > genpd->in_progress) | |
443 | return -EBUSY; | |
444 | ||
c6d22b37 RW |
445 | if (genpd->poweroff_task) { |
446 | /* | |
447 | * Another instance of pm_genpd_poweroff() is executing | |
448 | * callbacks, so tell it to start over and return. | |
449 | */ | |
450 | genpd->status = GPD_STATE_REPEAT; | |
451 | return 0; | |
452 | } | |
453 | ||
f721889f RW |
454 | if (genpd->gov && genpd->gov->power_down_ok) { |
455 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
456 | return -EAGAIN; | |
457 | } | |
458 | ||
17b75eca | 459 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 460 | genpd->poweroff_task = current; |
17b75eca | 461 | |
4605ab65 | 462 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 463 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 464 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
465 | |
466 | if (genpd_abort_poweroff(genpd)) | |
467 | goto out; | |
468 | ||
697a7f37 RW |
469 | if (ret) { |
470 | genpd_set_active(genpd); | |
471 | goto out; | |
472 | } | |
f721889f | 473 | |
c6d22b37 RW |
474 | if (genpd->status == GPD_STATE_REPEAT) { |
475 | genpd->poweroff_task = NULL; | |
476 | goto start; | |
477 | } | |
478 | } | |
17b75eca | 479 | |
cbc9ef02 RW |
480 | if (genpd->cpu_data) { |
481 | /* | |
482 | * If cpu_data is set, cpuidle should turn the domain off when | |
483 | * the CPU in it is idle. In that case we don't decrement the | |
484 | * subdomain counts of the master domains, so that power is not | |
485 | * removed from the current domain prematurely as a result of | |
486 | * cutting off the masters' power. | |
487 | */ | |
488 | genpd->status = GPD_STATE_POWER_OFF; | |
489 | cpuidle_pause_and_lock(); | |
490 | genpd->cpu_data->idle_state->disabled = false; | |
491 | cpuidle_resume_and_unlock(); | |
492 | goto out; | |
493 | } | |
494 | ||
3c07cbc4 | 495 | if (genpd->power_off) { |
0140d8bd RW |
496 | ktime_t time_start; |
497 | s64 elapsed_ns; | |
498 | ||
3c07cbc4 RW |
499 | if (atomic_read(&genpd->sd_count) > 0) { |
500 | ret = -EBUSY; | |
c6d22b37 RW |
501 | goto out; |
502 | } | |
17b75eca | 503 | |
0140d8bd RW |
504 | time_start = ktime_get(); |
505 | ||
3c07cbc4 | 506 | /* |
5063ce15 RW |
507 | * If sd_count > 0 at this point, one of the subdomains hasn't |
508 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
509 | * incrementing it. In that case pm_genpd_poweron() will wait |
510 | * for us to drop the lock, so we can call .power_off() and let | |
511 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
512 | * happen very often). | |
513 | */ | |
d2805402 RW |
514 | ret = genpd->power_off(genpd); |
515 | if (ret == -EBUSY) { | |
516 | genpd_set_active(genpd); | |
d2805402 RW |
517 | goto out; |
518 | } | |
0140d8bd RW |
519 | |
520 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 521 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 522 | genpd->power_off_latency_ns = elapsed_ns; |
6ff7bb0d | 523 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
524 | if (genpd->name) |
525 | pr_warning("%s: Power-off latency exceeded, " | |
526 | "new value %lld ns\n", genpd->name, | |
527 | elapsed_ns); | |
528 | } | |
d2805402 | 529 | } |
f721889f | 530 | |
17b75eca | 531 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 532 | |
5063ce15 RW |
533 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
534 | genpd_sd_counter_dec(link->master); | |
535 | genpd_queue_power_off_work(link->master); | |
536 | } | |
f721889f | 537 | |
c6d22b37 RW |
538 | out: |
539 | genpd->poweroff_task = NULL; | |
540 | wake_up_all(&genpd->status_wait_queue); | |
541 | return ret; | |
f721889f RW |
542 | } |
543 | ||
544 | /** | |
545 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
546 | * @work: Work structure used for scheduling the execution of this function. | |
547 | */ | |
548 | static void genpd_power_off_work_fn(struct work_struct *work) | |
549 | { | |
550 | struct generic_pm_domain *genpd; | |
551 | ||
552 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
553 | ||
17b75eca | 554 | genpd_acquire_lock(genpd); |
f721889f | 555 | pm_genpd_poweroff(genpd); |
17b75eca | 556 | genpd_release_lock(genpd); |
f721889f RW |
557 | } |
558 | ||
559 | /** | |
560 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
561 | * @dev: Device to suspend. | |
562 | * | |
563 | * Carry out a runtime suspend of a device under the assumption that its | |
564 | * pm_domain field points to the domain member of an object of type | |
565 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
566 | */ | |
567 | static int pm_genpd_runtime_suspend(struct device *dev) | |
568 | { | |
569 | struct generic_pm_domain *genpd; | |
b02c999a | 570 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 571 | int ret; |
f721889f RW |
572 | |
573 | dev_dbg(dev, "%s()\n", __func__); | |
574 | ||
5248051b RW |
575 | genpd = dev_to_genpd(dev); |
576 | if (IS_ERR(genpd)) | |
f721889f RW |
577 | return -EINVAL; |
578 | ||
0aa2a221 RW |
579 | might_sleep_if(!genpd->dev_irq_safe); |
580 | ||
1e78a0c7 RW |
581 | if (dev_gpd_data(dev)->always_on) |
582 | return -EBUSY; | |
583 | ||
b02c999a RW |
584 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
585 | if (stop_ok && !stop_ok(dev)) | |
586 | return -EBUSY; | |
587 | ||
d5e4cbfe RW |
588 | ret = genpd_stop_dev(genpd, dev); |
589 | if (ret) | |
590 | return ret; | |
17b75eca | 591 | |
0aa2a221 RW |
592 | /* |
593 | * If power.irq_safe is set, this routine will be run with interrupts | |
594 | * off, so it can't use mutexes. | |
595 | */ | |
596 | if (dev->power.irq_safe) | |
597 | return 0; | |
598 | ||
c6d22b37 | 599 | mutex_lock(&genpd->lock); |
f721889f RW |
600 | genpd->in_progress++; |
601 | pm_genpd_poweroff(genpd); | |
602 | genpd->in_progress--; | |
c6d22b37 | 603 | mutex_unlock(&genpd->lock); |
f721889f RW |
604 | |
605 | return 0; | |
606 | } | |
607 | ||
f721889f RW |
608 | /** |
609 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
610 | * @dev: Device to resume. | |
611 | * | |
612 | * Carry out a runtime resume of a device under the assumption that its | |
613 | * pm_domain field points to the domain member of an object of type | |
614 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
615 | */ | |
616 | static int pm_genpd_runtime_resume(struct device *dev) | |
617 | { | |
618 | struct generic_pm_domain *genpd; | |
c6d22b37 | 619 | DEFINE_WAIT(wait); |
f721889f RW |
620 | int ret; |
621 | ||
622 | dev_dbg(dev, "%s()\n", __func__); | |
623 | ||
5248051b RW |
624 | genpd = dev_to_genpd(dev); |
625 | if (IS_ERR(genpd)) | |
f721889f RW |
626 | return -EINVAL; |
627 | ||
0aa2a221 RW |
628 | might_sleep_if(!genpd->dev_irq_safe); |
629 | ||
630 | /* If power.irq_safe, the PM domain is never powered off. */ | |
631 | if (dev->power.irq_safe) | |
80de3d7f | 632 | return genpd_start_dev(genpd, dev); |
0aa2a221 | 633 | |
c6d22b37 | 634 | mutex_lock(&genpd->lock); |
3f241775 RW |
635 | ret = __pm_genpd_poweron(genpd); |
636 | if (ret) { | |
637 | mutex_unlock(&genpd->lock); | |
638 | return ret; | |
639 | } | |
17b75eca | 640 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
641 | genpd->resume_count++; |
642 | for (;;) { | |
643 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
644 | TASK_UNINTERRUPTIBLE); | |
645 | /* | |
646 | * If current is the powering off task, we have been called | |
647 | * reentrantly from one of the device callbacks, so we should | |
648 | * not wait. | |
649 | */ | |
650 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
651 | break; | |
652 | mutex_unlock(&genpd->lock); | |
653 | ||
654 | schedule(); | |
655 | ||
656 | mutex_lock(&genpd->lock); | |
657 | } | |
658 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 659 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
660 | genpd->resume_count--; |
661 | genpd_set_active(genpd); | |
17b75eca | 662 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 663 | mutex_unlock(&genpd->lock); |
17b75eca | 664 | |
f721889f RW |
665 | return 0; |
666 | } | |
667 | ||
17f2ae7f RW |
668 | /** |
669 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
670 | */ | |
671 | void pm_genpd_poweroff_unused(void) | |
672 | { | |
673 | struct generic_pm_domain *genpd; | |
674 | ||
675 | mutex_lock(&gpd_list_lock); | |
676 | ||
677 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
678 | genpd_queue_power_off_work(genpd); | |
679 | ||
680 | mutex_unlock(&gpd_list_lock); | |
681 | } | |
682 | ||
f721889f RW |
683 | #else |
684 | ||
6ff7bb0d RW |
685 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
686 | unsigned long val, void *ptr) | |
687 | { | |
688 | return NOTIFY_DONE; | |
689 | } | |
690 | ||
f721889f RW |
691 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
692 | ||
693 | #define pm_genpd_runtime_suspend NULL | |
694 | #define pm_genpd_runtime_resume NULL | |
695 | ||
696 | #endif /* CONFIG_PM_RUNTIME */ | |
697 | ||
596ba34b RW |
698 | #ifdef CONFIG_PM_SLEEP |
699 | ||
d5e4cbfe RW |
700 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
701 | struct device *dev) | |
702 | { | |
703 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
704 | } | |
705 | ||
d23b9b00 RW |
706 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
707 | { | |
708 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); | |
709 | } | |
710 | ||
711 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) | |
712 | { | |
713 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); | |
714 | } | |
715 | ||
716 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) | |
717 | { | |
718 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); | |
719 | } | |
720 | ||
721 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) | |
722 | { | |
723 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); | |
724 | } | |
725 | ||
726 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) | |
727 | { | |
728 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); | |
729 | } | |
730 | ||
731 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) | |
732 | { | |
733 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); | |
734 | } | |
735 | ||
736 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) | |
737 | { | |
738 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); | |
739 | } | |
740 | ||
741 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) | |
742 | { | |
743 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); | |
744 | } | |
745 | ||
596ba34b | 746 | /** |
5063ce15 | 747 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
748 | * @genpd: PM domain to power off, if possible. |
749 | * | |
750 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 751 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b RW |
752 | * |
753 | * This function is only called in "noirq" stages of system power transitions, | |
754 | * so it need not acquire locks (all of the "noirq" callbacks are executed | |
755 | * sequentially, so it is guaranteed that it will never run twice in parallel). | |
756 | */ | |
757 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
758 | { | |
5063ce15 | 759 | struct gpd_link *link; |
596ba34b | 760 | |
17b75eca | 761 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
762 | return; |
763 | ||
c4bb3160 RW |
764 | if (genpd->suspended_count != genpd->device_count |
765 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
766 | return; |
767 | ||
768 | if (genpd->power_off) | |
769 | genpd->power_off(genpd); | |
770 | ||
17b75eca | 771 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
772 | |
773 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
774 | genpd_sd_counter_dec(link->master); | |
775 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
776 | } |
777 | } | |
778 | ||
4ecd6e65 RW |
779 | /** |
780 | * resume_needed - Check whether to resume a device before system suspend. | |
781 | * @dev: Device to check. | |
782 | * @genpd: PM domain the device belongs to. | |
783 | * | |
784 | * There are two cases in which a device that can wake up the system from sleep | |
785 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
786 | * to wake up the system and it has to remain active for this purpose while the | |
787 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
788 | * the system from sleep states and it generally doesn't generate wakeup signals | |
789 | * by itself (those signals are generated on its behalf by other parts of the | |
790 | * system). In the latter case it may be necessary to reconfigure the device's | |
791 | * wakeup settings during system suspend, because it may have been set up to | |
792 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
793 | * Return 'true' in either of the above cases. | |
794 | */ | |
795 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
796 | { | |
797 | bool active_wakeup; | |
798 | ||
799 | if (!device_can_wakeup(dev)) | |
800 | return false; | |
801 | ||
d5e4cbfe | 802 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
803 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
804 | } | |
805 | ||
596ba34b RW |
806 | /** |
807 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
808 | * @dev: Device to start the transition of. | |
809 | * | |
810 | * Start a power transition of a device (during a system-wide power transition) | |
811 | * under the assumption that its pm_domain field points to the domain member of | |
812 | * an object of type struct generic_pm_domain representing a PM domain | |
813 | * consisting of I/O devices. | |
814 | */ | |
815 | static int pm_genpd_prepare(struct device *dev) | |
816 | { | |
817 | struct generic_pm_domain *genpd; | |
b6c10c84 | 818 | int ret; |
596ba34b RW |
819 | |
820 | dev_dbg(dev, "%s()\n", __func__); | |
821 | ||
822 | genpd = dev_to_genpd(dev); | |
823 | if (IS_ERR(genpd)) | |
824 | return -EINVAL; | |
825 | ||
17b75eca RW |
826 | /* |
827 | * If a wakeup request is pending for the device, it should be woken up | |
828 | * at this point and a system wakeup event should be reported if it's | |
829 | * set up to wake up the system from sleep states. | |
830 | */ | |
831 | pm_runtime_get_noresume(dev); | |
832 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
833 | pm_wakeup_event(dev, 0); | |
834 | ||
835 | if (pm_wakeup_pending()) { | |
836 | pm_runtime_put_sync(dev); | |
837 | return -EBUSY; | |
838 | } | |
839 | ||
4ecd6e65 RW |
840 | if (resume_needed(dev, genpd)) |
841 | pm_runtime_resume(dev); | |
842 | ||
17b75eca | 843 | genpd_acquire_lock(genpd); |
596ba34b | 844 | |
65533bbf RW |
845 | if (genpd->prepared_count++ == 0) { |
846 | genpd->suspended_count = 0; | |
17b75eca | 847 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 848 | } |
17b75eca RW |
849 | |
850 | genpd_release_lock(genpd); | |
596ba34b RW |
851 | |
852 | if (genpd->suspend_power_off) { | |
17b75eca | 853 | pm_runtime_put_noidle(dev); |
596ba34b RW |
854 | return 0; |
855 | } | |
856 | ||
857 | /* | |
17b75eca RW |
858 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
859 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 860 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 861 | * to make it operational. |
596ba34b | 862 | */ |
17b75eca | 863 | pm_runtime_resume(dev); |
596ba34b RW |
864 | __pm_runtime_disable(dev, false); |
865 | ||
b6c10c84 RW |
866 | ret = pm_generic_prepare(dev); |
867 | if (ret) { | |
868 | mutex_lock(&genpd->lock); | |
869 | ||
870 | if (--genpd->prepared_count == 0) | |
871 | genpd->suspend_power_off = false; | |
872 | ||
873 | mutex_unlock(&genpd->lock); | |
17b75eca | 874 | pm_runtime_enable(dev); |
b6c10c84 | 875 | } |
17b75eca RW |
876 | |
877 | pm_runtime_put_sync(dev); | |
b6c10c84 | 878 | return ret; |
596ba34b RW |
879 | } |
880 | ||
881 | /** | |
882 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
883 | * @dev: Device to suspend. | |
884 | * | |
885 | * Suspend a device under the assumption that its pm_domain field points to the | |
886 | * domain member of an object of type struct generic_pm_domain representing | |
887 | * a PM domain consisting of I/O devices. | |
888 | */ | |
889 | static int pm_genpd_suspend(struct device *dev) | |
890 | { | |
891 | struct generic_pm_domain *genpd; | |
892 | ||
893 | dev_dbg(dev, "%s()\n", __func__); | |
894 | ||
895 | genpd = dev_to_genpd(dev); | |
896 | if (IS_ERR(genpd)) | |
897 | return -EINVAL; | |
898 | ||
d23b9b00 | 899 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
596ba34b RW |
900 | } |
901 | ||
902 | /** | |
0496c8ae | 903 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
904 | * @dev: Device to suspend. |
905 | * | |
906 | * Carry out a late suspend of a device under the assumption that its | |
907 | * pm_domain field points to the domain member of an object of type | |
908 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
909 | */ | |
0496c8ae | 910 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
911 | { |
912 | struct generic_pm_domain *genpd; | |
596ba34b RW |
913 | |
914 | dev_dbg(dev, "%s()\n", __func__); | |
915 | ||
916 | genpd = dev_to_genpd(dev); | |
917 | if (IS_ERR(genpd)) | |
918 | return -EINVAL; | |
919 | ||
0496c8ae RW |
920 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
921 | } | |
596ba34b | 922 | |
0496c8ae RW |
923 | /** |
924 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
925 | * @dev: Device to suspend. | |
926 | * | |
927 | * Stop the device and remove power from the domain if all devices in it have | |
928 | * been stopped. | |
929 | */ | |
930 | static int pm_genpd_suspend_noirq(struct device *dev) | |
931 | { | |
932 | struct generic_pm_domain *genpd; | |
933 | ||
934 | dev_dbg(dev, "%s()\n", __func__); | |
935 | ||
936 | genpd = dev_to_genpd(dev); | |
937 | if (IS_ERR(genpd)) | |
938 | return -EINVAL; | |
596ba34b | 939 | |
1e78a0c7 | 940 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
0496c8ae | 941 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
942 | return 0; |
943 | ||
d5e4cbfe | 944 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
945 | |
946 | /* | |
947 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
948 | * guaranteed that this function will never run twice in parallel for | |
949 | * the same PM domain, so it is not necessary to use locking here. | |
950 | */ | |
951 | genpd->suspended_count++; | |
952 | pm_genpd_sync_poweroff(genpd); | |
953 | ||
954 | return 0; | |
955 | } | |
956 | ||
957 | /** | |
0496c8ae | 958 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
959 | * @dev: Device to resume. |
960 | * | |
0496c8ae | 961 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
962 | */ |
963 | static int pm_genpd_resume_noirq(struct device *dev) | |
964 | { | |
965 | struct generic_pm_domain *genpd; | |
966 | ||
967 | dev_dbg(dev, "%s()\n", __func__); | |
968 | ||
969 | genpd = dev_to_genpd(dev); | |
970 | if (IS_ERR(genpd)) | |
971 | return -EINVAL; | |
972 | ||
1e78a0c7 | 973 | if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on |
cc85b207 | 974 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
975 | return 0; |
976 | ||
977 | /* | |
978 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
979 | * guaranteed that this function will never run twice in parallel for | |
980 | * the same PM domain, so it is not necessary to use locking here. | |
981 | */ | |
982 | pm_genpd_poweron(genpd); | |
983 | genpd->suspended_count--; | |
596ba34b | 984 | |
0496c8ae | 985 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
986 | } |
987 | ||
988 | /** | |
0496c8ae RW |
989 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
990 | * @dev: Device to resume. | |
991 | * | |
992 | * Carry out an early resume of a device under the assumption that its | |
993 | * pm_domain field points to the domain member of an object of type | |
994 | * struct generic_pm_domain representing a power domain consisting of I/O | |
995 | * devices. | |
996 | */ | |
997 | static int pm_genpd_resume_early(struct device *dev) | |
998 | { | |
999 | struct generic_pm_domain *genpd; | |
1000 | ||
1001 | dev_dbg(dev, "%s()\n", __func__); | |
1002 | ||
1003 | genpd = dev_to_genpd(dev); | |
1004 | if (IS_ERR(genpd)) | |
1005 | return -EINVAL; | |
1006 | ||
1007 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1012 | * @dev: Device to resume. |
1013 | * | |
1014 | * Resume a device under the assumption that its pm_domain field points to the | |
1015 | * domain member of an object of type struct generic_pm_domain representing | |
1016 | * a power domain consisting of I/O devices. | |
1017 | */ | |
1018 | static int pm_genpd_resume(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; | |
1027 | ||
d23b9b00 | 1028 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
596ba34b RW |
1029 | } |
1030 | ||
1031 | /** | |
0496c8ae | 1032 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1033 | * @dev: Device to freeze. |
1034 | * | |
1035 | * Freeze a device under the assumption that its pm_domain field points to the | |
1036 | * domain member of an object of type struct generic_pm_domain representing | |
1037 | * a power domain consisting of I/O devices. | |
1038 | */ | |
1039 | static int pm_genpd_freeze(struct device *dev) | |
1040 | { | |
1041 | struct generic_pm_domain *genpd; | |
1042 | ||
1043 | dev_dbg(dev, "%s()\n", __func__); | |
1044 | ||
1045 | genpd = dev_to_genpd(dev); | |
1046 | if (IS_ERR(genpd)) | |
1047 | return -EINVAL; | |
1048 | ||
d23b9b00 | 1049 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
596ba34b RW |
1050 | } |
1051 | ||
1052 | /** | |
0496c8ae RW |
1053 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1054 | * @dev: Device to freeze. | |
1055 | * | |
1056 | * Carry out a late freeze of a device under the assumption that its | |
1057 | * pm_domain field points to the domain member of an object of type | |
1058 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1059 | * devices. | |
1060 | */ | |
1061 | static int pm_genpd_freeze_late(struct device *dev) | |
1062 | { | |
1063 | struct generic_pm_domain *genpd; | |
1064 | ||
1065 | dev_dbg(dev, "%s()\n", __func__); | |
1066 | ||
1067 | genpd = dev_to_genpd(dev); | |
1068 | if (IS_ERR(genpd)) | |
1069 | return -EINVAL; | |
1070 | ||
1071 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1076 | * @dev: Device to freeze. |
1077 | * | |
1078 | * Carry out a late freeze of a device under the assumption that its | |
1079 | * pm_domain field points to the domain member of an object of type | |
1080 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1081 | * devices. | |
1082 | */ | |
1083 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1084 | { | |
1085 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1086 | |
1087 | dev_dbg(dev, "%s()\n", __func__); | |
1088 | ||
1089 | genpd = dev_to_genpd(dev); | |
1090 | if (IS_ERR(genpd)) | |
1091 | return -EINVAL; | |
1092 | ||
1e78a0c7 RW |
1093 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1094 | 0 : genpd_stop_dev(genpd, dev); | |
0496c8ae | 1095 | } |
596ba34b | 1096 | |
0496c8ae RW |
1097 | /** |
1098 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1099 | * @dev: Device to thaw. | |
1100 | * | |
1101 | * Start the device, unless power has been removed from the domain already | |
1102 | * before the system transition. | |
1103 | */ | |
1104 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1105 | { | |
1106 | struct generic_pm_domain *genpd; | |
596ba34b | 1107 | |
0496c8ae | 1108 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1109 | |
0496c8ae RW |
1110 | genpd = dev_to_genpd(dev); |
1111 | if (IS_ERR(genpd)) | |
1112 | return -EINVAL; | |
1113 | ||
1e78a0c7 RW |
1114 | return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ? |
1115 | 0 : genpd_start_dev(genpd, dev); | |
596ba34b RW |
1116 | } |
1117 | ||
1118 | /** | |
0496c8ae | 1119 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1120 | * @dev: Device to thaw. |
1121 | * | |
1122 | * Carry out an early thaw of a device under the assumption that its | |
1123 | * pm_domain field points to the domain member of an object of type | |
1124 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1125 | * devices. | |
1126 | */ | |
0496c8ae | 1127 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
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 | ||
0496c8ae | 1137 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
596ba34b RW |
1138 | } |
1139 | ||
1140 | /** | |
1141 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1142 | * @dev: Device to thaw. | |
1143 | * | |
1144 | * Thaw a device under the assumption that its pm_domain field points to the | |
1145 | * domain member of an object of type struct generic_pm_domain representing | |
1146 | * a power domain consisting of I/O devices. | |
1147 | */ | |
1148 | static int pm_genpd_thaw(struct device *dev) | |
1149 | { | |
1150 | struct generic_pm_domain *genpd; | |
1151 | ||
1152 | dev_dbg(dev, "%s()\n", __func__); | |
1153 | ||
1154 | genpd = dev_to_genpd(dev); | |
1155 | if (IS_ERR(genpd)) | |
1156 | return -EINVAL; | |
1157 | ||
d23b9b00 | 1158 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
596ba34b RW |
1159 | } |
1160 | ||
1161 | /** | |
0496c8ae | 1162 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1163 | * @dev: Device to resume. |
1164 | * | |
0496c8ae RW |
1165 | * Make sure the domain will be in the same power state as before the |
1166 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1167 | */ |
1168 | static int pm_genpd_restore_noirq(struct device *dev) | |
1169 | { | |
1170 | struct generic_pm_domain *genpd; | |
1171 | ||
1172 | dev_dbg(dev, "%s()\n", __func__); | |
1173 | ||
1174 | genpd = dev_to_genpd(dev); | |
1175 | if (IS_ERR(genpd)) | |
1176 | return -EINVAL; | |
1177 | ||
1178 | /* | |
1179 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1180 | * guaranteed that this function will never run twice in parallel for | |
1181 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1182 | * |
1183 | * At this point suspended_count == 0 means we are being run for the | |
1184 | * first time for the given domain in the present cycle. | |
596ba34b | 1185 | */ |
65533bbf | 1186 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1187 | /* |
65533bbf RW |
1188 | * The boot kernel might put the domain into arbitrary state, |
1189 | * so make it appear as powered off to pm_genpd_poweron(), so | |
1190 | * that it tries to power it on in case it was really off. | |
596ba34b | 1191 | */ |
65533bbf RW |
1192 | genpd->status = GPD_STATE_POWER_OFF; |
1193 | if (genpd->suspend_power_off) { | |
1194 | /* | |
1195 | * If the domain was off before the hibernation, make | |
1196 | * sure it will be off going forward. | |
1197 | */ | |
1198 | if (genpd->power_off) | |
1199 | genpd->power_off(genpd); | |
1200 | ||
1201 | return 0; | |
1202 | } | |
596ba34b RW |
1203 | } |
1204 | ||
18dd2ece RW |
1205 | if (genpd->suspend_power_off) |
1206 | return 0; | |
1207 | ||
596ba34b | 1208 | pm_genpd_poweron(genpd); |
596ba34b | 1209 | |
1e78a0c7 | 1210 | return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1211 | } |
1212 | ||
1213 | /** | |
1214 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1215 | * @dev: Device to complete the transition of. | |
1216 | * | |
1217 | * Complete a power transition of a device (during a system-wide power | |
1218 | * transition) under the assumption that its pm_domain field points to the | |
1219 | * domain member of an object of type struct generic_pm_domain representing | |
1220 | * a power domain consisting of I/O devices. | |
1221 | */ | |
1222 | static void pm_genpd_complete(struct device *dev) | |
1223 | { | |
1224 | struct generic_pm_domain *genpd; | |
1225 | bool run_complete; | |
1226 | ||
1227 | dev_dbg(dev, "%s()\n", __func__); | |
1228 | ||
1229 | genpd = dev_to_genpd(dev); | |
1230 | if (IS_ERR(genpd)) | |
1231 | return; | |
1232 | ||
1233 | mutex_lock(&genpd->lock); | |
1234 | ||
1235 | run_complete = !genpd->suspend_power_off; | |
1236 | if (--genpd->prepared_count == 0) | |
1237 | genpd->suspend_power_off = false; | |
1238 | ||
1239 | mutex_unlock(&genpd->lock); | |
1240 | ||
1241 | if (run_complete) { | |
1242 | pm_generic_complete(dev); | |
6f00ff78 | 1243 | pm_runtime_set_active(dev); |
596ba34b | 1244 | pm_runtime_enable(dev); |
6f00ff78 | 1245 | pm_runtime_idle(dev); |
596ba34b RW |
1246 | } |
1247 | } | |
1248 | ||
1249 | #else | |
1250 | ||
1251 | #define pm_genpd_prepare NULL | |
1252 | #define pm_genpd_suspend NULL | |
0496c8ae | 1253 | #define pm_genpd_suspend_late NULL |
596ba34b | 1254 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1255 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1256 | #define pm_genpd_resume_noirq NULL |
1257 | #define pm_genpd_resume NULL | |
1258 | #define pm_genpd_freeze NULL | |
0496c8ae | 1259 | #define pm_genpd_freeze_late NULL |
596ba34b | 1260 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1261 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1262 | #define pm_genpd_thaw_noirq NULL |
1263 | #define pm_genpd_thaw NULL | |
596ba34b | 1264 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1265 | #define pm_genpd_complete NULL |
1266 | ||
1267 | #endif /* CONFIG_PM_SLEEP */ | |
1268 | ||
f721889f | 1269 | /** |
b02c999a | 1270 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1271 | * @genpd: PM domain to add the device to. |
1272 | * @dev: Device to be added. | |
b02c999a | 1273 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1274 | */ |
b02c999a RW |
1275 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1276 | struct gpd_timing_data *td) | |
f721889f | 1277 | { |
cd0ea672 | 1278 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1279 | struct pm_domain_data *pdd; |
f721889f RW |
1280 | int ret = 0; |
1281 | ||
1282 | dev_dbg(dev, "%s()\n", __func__); | |
1283 | ||
1284 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1285 | return -EINVAL; | |
1286 | ||
6ff7bb0d RW |
1287 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1288 | if (!gpd_data) | |
1289 | return -ENOMEM; | |
1290 | ||
1291 | mutex_init(&gpd_data->lock); | |
1292 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1293 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1294 | ||
17b75eca | 1295 | genpd_acquire_lock(genpd); |
f721889f | 1296 | |
596ba34b RW |
1297 | if (genpd->prepared_count > 0) { |
1298 | ret = -EAGAIN; | |
1299 | goto out; | |
1300 | } | |
1301 | ||
4605ab65 RW |
1302 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1303 | if (pdd->dev == dev) { | |
f721889f RW |
1304 | ret = -EINVAL; |
1305 | goto out; | |
1306 | } | |
1307 | ||
596ba34b | 1308 | genpd->device_count++; |
6ff7bb0d | 1309 | genpd->max_off_time_changed = true; |
f721889f | 1310 | |
4605ab65 | 1311 | dev_pm_get_subsys_data(dev); |
6ff7bb0d RW |
1312 | |
1313 | mutex_lock(&gpd_data->lock); | |
1314 | spin_lock_irq(&dev->power.lock); | |
1315 | dev->pm_domain = &genpd->domain; | |
cd0ea672 RW |
1316 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1317 | gpd_data->base.dev = dev; | |
cd0ea672 | 1318 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
ca1d72f0 | 1319 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; |
b02c999a RW |
1320 | if (td) |
1321 | gpd_data->td = *td; | |
f721889f | 1322 | |
6ff7bb0d RW |
1323 | gpd_data->td.constraint_changed = true; |
1324 | gpd_data->td.effective_constraint_ns = -1; | |
1325 | spin_unlock_irq(&dev->power.lock); | |
1326 | mutex_unlock(&gpd_data->lock); | |
1327 | ||
1328 | genpd_release_lock(genpd); | |
1329 | ||
1330 | return 0; | |
1331 | ||
f721889f | 1332 | out: |
17b75eca | 1333 | genpd_release_lock(genpd); |
f721889f | 1334 | |
6ff7bb0d RW |
1335 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); |
1336 | kfree(gpd_data); | |
f721889f RW |
1337 | return ret; |
1338 | } | |
1339 | ||
c8aa130b TA |
1340 | /** |
1341 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1342 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1343 | * the device is added to. | |
1344 | * @dev: Device to be added. | |
1345 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1346 | */ | |
1347 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1348 | struct gpd_timing_data *td) | |
1349 | { | |
1350 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1351 | ||
1352 | dev_dbg(dev, "%s()\n", __func__); | |
1353 | ||
1354 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1355 | return -EINVAL; | |
1356 | ||
1357 | mutex_lock(&gpd_list_lock); | |
1358 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1359 | if (gpd->of_node == genpd_node) { | |
1360 | genpd = gpd; | |
1361 | break; | |
1362 | } | |
1363 | } | |
1364 | mutex_unlock(&gpd_list_lock); | |
1365 | ||
1366 | if (!genpd) | |
1367 | return -EINVAL; | |
1368 | ||
1369 | return __pm_genpd_add_device(genpd, dev, td); | |
1370 | } | |
1371 | ||
f721889f RW |
1372 | /** |
1373 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1374 | * @genpd: PM domain to remove the device from. | |
1375 | * @dev: Device to be removed. | |
1376 | */ | |
1377 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1378 | struct device *dev) | |
1379 | { | |
6ff7bb0d | 1380 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1381 | struct pm_domain_data *pdd; |
efa69025 | 1382 | int ret = 0; |
f721889f RW |
1383 | |
1384 | dev_dbg(dev, "%s()\n", __func__); | |
1385 | ||
efa69025 RW |
1386 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1387 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1388 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1389 | return -EINVAL; |
1390 | ||
17b75eca | 1391 | genpd_acquire_lock(genpd); |
f721889f | 1392 | |
596ba34b RW |
1393 | if (genpd->prepared_count > 0) { |
1394 | ret = -EAGAIN; | |
1395 | goto out; | |
1396 | } | |
1397 | ||
6ff7bb0d RW |
1398 | genpd->device_count--; |
1399 | genpd->max_off_time_changed = true; | |
1400 | ||
1401 | spin_lock_irq(&dev->power.lock); | |
efa69025 RW |
1402 | dev->pm_domain = NULL; |
1403 | pdd = dev->power.subsys_data->domain_data; | |
1404 | list_del_init(&pdd->list_node); | |
1405 | dev->power.subsys_data->domain_data = NULL; | |
6ff7bb0d | 1406 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1407 | |
6ff7bb0d RW |
1408 | gpd_data = to_gpd_data(pdd); |
1409 | mutex_lock(&gpd_data->lock); | |
1410 | pdd->dev = NULL; | |
1411 | mutex_unlock(&gpd_data->lock); | |
1412 | ||
1413 | genpd_release_lock(genpd); | |
1414 | ||
1415 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1416 | kfree(gpd_data); | |
1417 | dev_pm_put_subsys_data(dev); | |
1418 | return 0; | |
f721889f | 1419 | |
596ba34b | 1420 | out: |
17b75eca | 1421 | genpd_release_lock(genpd); |
f721889f RW |
1422 | |
1423 | return ret; | |
1424 | } | |
1425 | ||
1e78a0c7 RW |
1426 | /** |
1427 | * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device. | |
1428 | * @dev: Device to set/unset the flag for. | |
1429 | * @val: The new value of the device's "always on" flag. | |
1430 | */ | |
1431 | void pm_genpd_dev_always_on(struct device *dev, bool val) | |
1432 | { | |
1433 | struct pm_subsys_data *psd; | |
1434 | unsigned long flags; | |
1435 | ||
1436 | spin_lock_irqsave(&dev->power.lock, flags); | |
1437 | ||
1438 | psd = dev_to_psd(dev); | |
1439 | if (psd && psd->domain_data) | |
1440 | to_gpd_data(psd->domain_data)->always_on = val; | |
1441 | ||
1442 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1443 | } | |
1444 | EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on); | |
1445 | ||
ca1d72f0 RW |
1446 | /** |
1447 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1448 | * @dev: Device to set/unset the flag for. | |
1449 | * @val: The new value of the device's "need restore" flag. | |
1450 | */ | |
1451 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1452 | { | |
1453 | struct pm_subsys_data *psd; | |
1454 | unsigned long flags; | |
1455 | ||
1456 | spin_lock_irqsave(&dev->power.lock, flags); | |
1457 | ||
1458 | psd = dev_to_psd(dev); | |
1459 | if (psd && psd->domain_data) | |
1460 | to_gpd_data(psd->domain_data)->need_restore = val; | |
1461 | ||
1462 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1463 | } | |
1464 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1465 | ||
f721889f RW |
1466 | /** |
1467 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1468 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1469 | * @subdomain: Subdomain to be added. |
f721889f RW |
1470 | */ |
1471 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1472 | struct generic_pm_domain *subdomain) |
f721889f | 1473 | { |
5063ce15 | 1474 | struct gpd_link *link; |
f721889f RW |
1475 | int ret = 0; |
1476 | ||
bc0403ff | 1477 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1478 | return -EINVAL; |
1479 | ||
17b75eca RW |
1480 | start: |
1481 | genpd_acquire_lock(genpd); | |
bc0403ff | 1482 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1483 | |
bc0403ff RW |
1484 | if (subdomain->status != GPD_STATE_POWER_OFF |
1485 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1486 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1487 | genpd_release_lock(genpd); |
1488 | goto start; | |
1489 | } | |
1490 | ||
1491 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1492 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1493 | ret = -EINVAL; |
1494 | goto out; | |
1495 | } | |
1496 | ||
4fcac10d | 1497 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1498 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1499 | ret = -EINVAL; |
1500 | goto out; | |
1501 | } | |
1502 | } | |
1503 | ||
5063ce15 RW |
1504 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1505 | if (!link) { | |
1506 | ret = -ENOMEM; | |
1507 | goto out; | |
1508 | } | |
1509 | link->master = genpd; | |
1510 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1511 | link->slave = subdomain; |
1512 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1513 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1514 | genpd_sd_counter_inc(genpd); |
f721889f | 1515 | |
f721889f | 1516 | out: |
bc0403ff | 1517 | mutex_unlock(&subdomain->lock); |
17b75eca | 1518 | genpd_release_lock(genpd); |
f721889f RW |
1519 | |
1520 | return ret; | |
1521 | } | |
1522 | ||
1523 | /** | |
1524 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1525 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1526 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1527 | */ |
1528 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1529 | struct generic_pm_domain *subdomain) |
f721889f | 1530 | { |
5063ce15 | 1531 | struct gpd_link *link; |
f721889f RW |
1532 | int ret = -EINVAL; |
1533 | ||
5063ce15 | 1534 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1535 | return -EINVAL; |
1536 | ||
17b75eca RW |
1537 | start: |
1538 | genpd_acquire_lock(genpd); | |
f721889f | 1539 | |
5063ce15 RW |
1540 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1541 | if (link->slave != subdomain) | |
f721889f RW |
1542 | continue; |
1543 | ||
1544 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1545 | ||
17b75eca RW |
1546 | if (subdomain->status != GPD_STATE_POWER_OFF |
1547 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1548 | mutex_unlock(&subdomain->lock); | |
1549 | genpd_release_lock(genpd); | |
1550 | goto start; | |
1551 | } | |
1552 | ||
5063ce15 RW |
1553 | list_del(&link->master_node); |
1554 | list_del(&link->slave_node); | |
1555 | kfree(link); | |
17b75eca | 1556 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1557 | genpd_sd_counter_dec(genpd); |
1558 | ||
1559 | mutex_unlock(&subdomain->lock); | |
1560 | ||
1561 | ret = 0; | |
1562 | break; | |
1563 | } | |
1564 | ||
17b75eca | 1565 | genpd_release_lock(genpd); |
f721889f RW |
1566 | |
1567 | return ret; | |
1568 | } | |
1569 | ||
d5e4cbfe RW |
1570 | /** |
1571 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. | |
1572 | * @dev: Device to add the callbacks to. | |
1573 | * @ops: Set of callbacks to add. | |
b02c999a | 1574 | * @td: Timing data to add to the device along with the callbacks (optional). |
d5e4cbfe | 1575 | */ |
b02c999a RW |
1576 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1577 | struct gpd_timing_data *td) | |
d5e4cbfe RW |
1578 | { |
1579 | struct pm_domain_data *pdd; | |
1580 | int ret = 0; | |
1581 | ||
1582 | if (!(dev && dev->power.subsys_data && ops)) | |
1583 | return -EINVAL; | |
1584 | ||
1585 | pm_runtime_disable(dev); | |
1586 | device_pm_lock(); | |
1587 | ||
1588 | pdd = dev->power.subsys_data->domain_data; | |
1589 | if (pdd) { | |
1590 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1591 | ||
1592 | gpd_data->ops = *ops; | |
b02c999a RW |
1593 | if (td) |
1594 | gpd_data->td = *td; | |
d5e4cbfe RW |
1595 | } else { |
1596 | ret = -EINVAL; | |
1597 | } | |
1598 | ||
1599 | device_pm_unlock(); | |
1600 | pm_runtime_enable(dev); | |
1601 | ||
1602 | return ret; | |
1603 | } | |
1604 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); | |
1605 | ||
1606 | /** | |
b02c999a | 1607 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
d5e4cbfe | 1608 | * @dev: Device to remove the callbacks from. |
b02c999a | 1609 | * @clear_td: If set, clear the device's timing data too. |
d5e4cbfe | 1610 | */ |
b02c999a | 1611 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
d5e4cbfe RW |
1612 | { |
1613 | struct pm_domain_data *pdd; | |
1614 | int ret = 0; | |
1615 | ||
1616 | if (!(dev && dev->power.subsys_data)) | |
1617 | return -EINVAL; | |
1618 | ||
1619 | pm_runtime_disable(dev); | |
1620 | device_pm_lock(); | |
1621 | ||
1622 | pdd = dev->power.subsys_data->domain_data; | |
1623 | if (pdd) { | |
1624 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); | |
1625 | ||
1626 | gpd_data->ops = (struct gpd_dev_ops){ 0 }; | |
b02c999a RW |
1627 | if (clear_td) |
1628 | gpd_data->td = (struct gpd_timing_data){ 0 }; | |
d5e4cbfe RW |
1629 | } else { |
1630 | ret = -EINVAL; | |
1631 | } | |
1632 | ||
1633 | device_pm_unlock(); | |
1634 | pm_runtime_enable(dev); | |
1635 | ||
1636 | return ret; | |
1637 | } | |
b02c999a | 1638 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
d5e4cbfe | 1639 | |
cbc9ef02 RW |
1640 | int genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) |
1641 | { | |
1642 | struct cpuidle_driver *cpuidle_drv; | |
1643 | struct gpd_cpu_data *cpu_data; | |
1644 | struct cpuidle_state *idle_state; | |
1645 | int ret = 0; | |
1646 | ||
1647 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1648 | return -EINVAL; | |
1649 | ||
1650 | genpd_acquire_lock(genpd); | |
1651 | ||
1652 | if (genpd->cpu_data) { | |
1653 | ret = -EEXIST; | |
1654 | goto out; | |
1655 | } | |
1656 | cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); | |
1657 | if (!cpu_data) { | |
1658 | ret = -ENOMEM; | |
1659 | goto out; | |
1660 | } | |
1661 | cpuidle_drv = cpuidle_driver_ref(); | |
1662 | if (!cpuidle_drv) { | |
1663 | ret = -ENODEV; | |
1664 | goto out; | |
1665 | } | |
1666 | if (cpuidle_drv->state_count <= state) { | |
1667 | ret = -EINVAL; | |
1668 | goto err; | |
1669 | } | |
1670 | idle_state = &cpuidle_drv->states[state]; | |
1671 | if (!idle_state->disabled) { | |
1672 | ret = -EAGAIN; | |
1673 | goto err; | |
1674 | } | |
1675 | cpu_data->idle_state = idle_state; | |
1676 | cpu_data->saved_exit_latency = idle_state->exit_latency; | |
1677 | genpd->cpu_data = cpu_data; | |
1678 | genpd_recalc_cpu_exit_latency(genpd); | |
1679 | ||
1680 | out: | |
1681 | genpd_release_lock(genpd); | |
1682 | return ret; | |
1683 | ||
1684 | err: | |
1685 | cpuidle_driver_unref(); | |
1686 | goto out; | |
1687 | } | |
1688 | ||
1689 | int genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
1690 | { | |
1691 | struct gpd_cpu_data *cpu_data; | |
1692 | struct cpuidle_state *idle_state; | |
1693 | int ret = 0; | |
1694 | ||
1695 | if (IS_ERR_OR_NULL(genpd)) | |
1696 | return -EINVAL; | |
1697 | ||
1698 | genpd_acquire_lock(genpd); | |
1699 | ||
1700 | cpu_data = genpd->cpu_data; | |
1701 | if (!cpu_data) { | |
1702 | ret = -ENODEV; | |
1703 | goto out; | |
1704 | } | |
1705 | idle_state = cpu_data->idle_state; | |
1706 | if (!idle_state->disabled) { | |
1707 | ret = -EAGAIN; | |
1708 | goto out; | |
1709 | } | |
1710 | idle_state->exit_latency = cpu_data->saved_exit_latency; | |
1711 | cpuidle_driver_unref(); | |
1712 | genpd->cpu_data = NULL; | |
1713 | kfree(cpu_data); | |
1714 | ||
1715 | out: | |
1716 | genpd_release_lock(genpd); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
d23b9b00 RW |
1720 | /* Default device callbacks for generic PM domains. */ |
1721 | ||
ecf00475 RW |
1722 | /** |
1723 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1724 | * @dev: Device to handle. | |
1725 | */ | |
1726 | static int pm_genpd_default_save_state(struct device *dev) | |
1727 | { | |
1728 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1729 | |
1730 | cb = dev_gpd_data(dev)->ops.save_state; | |
1731 | if (cb) | |
1732 | return cb(dev); | |
1733 | ||
0b589741 RW |
1734 | if (dev->type && dev->type->pm) |
1735 | cb = dev->type->pm->runtime_suspend; | |
1736 | else if (dev->class && dev->class->pm) | |
1737 | cb = dev->class->pm->runtime_suspend; | |
1738 | else if (dev->bus && dev->bus->pm) | |
1739 | cb = dev->bus->pm->runtime_suspend; | |
1740 | else | |
1741 | cb = NULL; | |
ecf00475 | 1742 | |
0b589741 RW |
1743 | if (!cb && dev->driver && dev->driver->pm) |
1744 | cb = dev->driver->pm->runtime_suspend; | |
1745 | ||
1746 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1747 | } |
1748 | ||
1749 | /** | |
1750 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1751 | * @dev: Device to handle. | |
1752 | */ | |
1753 | static int pm_genpd_default_restore_state(struct device *dev) | |
1754 | { | |
1755 | int (*cb)(struct device *__dev); | |
ecf00475 RW |
1756 | |
1757 | cb = dev_gpd_data(dev)->ops.restore_state; | |
1758 | if (cb) | |
1759 | return cb(dev); | |
1760 | ||
0b589741 RW |
1761 | if (dev->type && dev->type->pm) |
1762 | cb = dev->type->pm->runtime_resume; | |
1763 | else if (dev->class && dev->class->pm) | |
1764 | cb = dev->class->pm->runtime_resume; | |
1765 | else if (dev->bus && dev->bus->pm) | |
1766 | cb = dev->bus->pm->runtime_resume; | |
1767 | else | |
1768 | cb = NULL; | |
ecf00475 | 1769 | |
0b589741 RW |
1770 | if (!cb && dev->driver && dev->driver->pm) |
1771 | cb = dev->driver->pm->runtime_resume; | |
1772 | ||
1773 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1774 | } |
1775 | ||
0f1d6986 RW |
1776 | #ifdef CONFIG_PM_SLEEP |
1777 | ||
d23b9b00 RW |
1778 | /** |
1779 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. | |
1780 | * @dev: Device to handle. | |
1781 | */ | |
1782 | static int pm_genpd_default_suspend(struct device *dev) | |
1783 | { | |
c9914854 | 1784 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
d23b9b00 RW |
1785 | |
1786 | return cb ? cb(dev) : pm_generic_suspend(dev); | |
1787 | } | |
1788 | ||
1789 | /** | |
1790 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. | |
1791 | * @dev: Device to handle. | |
1792 | */ | |
1793 | static int pm_genpd_default_suspend_late(struct device *dev) | |
1794 | { | |
c9914854 | 1795 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
d23b9b00 | 1796 | |
0496c8ae | 1797 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
d23b9b00 RW |
1798 | } |
1799 | ||
1800 | /** | |
1801 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. | |
1802 | * @dev: Device to handle. | |
1803 | */ | |
1804 | static int pm_genpd_default_resume_early(struct device *dev) | |
1805 | { | |
c9914854 | 1806 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
d23b9b00 | 1807 | |
0496c8ae | 1808 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
d23b9b00 RW |
1809 | } |
1810 | ||
1811 | /** | |
1812 | * pm_genpd_default_resume - Default "device resume" for PM domians. | |
1813 | * @dev: Device to handle. | |
1814 | */ | |
1815 | static int pm_genpd_default_resume(struct device *dev) | |
1816 | { | |
c9914854 | 1817 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
d23b9b00 RW |
1818 | |
1819 | return cb ? cb(dev) : pm_generic_resume(dev); | |
1820 | } | |
1821 | ||
1822 | /** | |
1823 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. | |
1824 | * @dev: Device to handle. | |
1825 | */ | |
1826 | static int pm_genpd_default_freeze(struct device *dev) | |
1827 | { | |
1828 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; | |
1829 | ||
1830 | return cb ? cb(dev) : pm_generic_freeze(dev); | |
1831 | } | |
1832 | ||
1833 | /** | |
1834 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. | |
1835 | * @dev: Device to handle. | |
1836 | */ | |
1837 | static int pm_genpd_default_freeze_late(struct device *dev) | |
1838 | { | |
1839 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; | |
1840 | ||
0496c8ae | 1841 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
d23b9b00 RW |
1842 | } |
1843 | ||
1844 | /** | |
1845 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. | |
1846 | * @dev: Device to handle. | |
1847 | */ | |
1848 | static int pm_genpd_default_thaw_early(struct device *dev) | |
1849 | { | |
1850 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; | |
1851 | ||
0496c8ae | 1852 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
d23b9b00 RW |
1853 | } |
1854 | ||
1855 | /** | |
1856 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. | |
1857 | * @dev: Device to handle. | |
1858 | */ | |
1859 | static int pm_genpd_default_thaw(struct device *dev) | |
1860 | { | |
1861 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; | |
1862 | ||
1863 | return cb ? cb(dev) : pm_generic_thaw(dev); | |
1864 | } | |
1865 | ||
0f1d6986 RW |
1866 | #else /* !CONFIG_PM_SLEEP */ |
1867 | ||
1868 | #define pm_genpd_default_suspend NULL | |
1869 | #define pm_genpd_default_suspend_late NULL | |
1870 | #define pm_genpd_default_resume_early NULL | |
1871 | #define pm_genpd_default_resume NULL | |
1872 | #define pm_genpd_default_freeze NULL | |
1873 | #define pm_genpd_default_freeze_late NULL | |
1874 | #define pm_genpd_default_thaw_early NULL | |
1875 | #define pm_genpd_default_thaw NULL | |
1876 | ||
1877 | #endif /* !CONFIG_PM_SLEEP */ | |
1878 | ||
f721889f RW |
1879 | /** |
1880 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1881 | * @genpd: PM domain object to initialize. | |
1882 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1883 | * @is_off: Initial value of the domain's power_is_off field. | |
1884 | */ | |
1885 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1886 | struct dev_power_governor *gov, bool is_off) | |
1887 | { | |
1888 | if (IS_ERR_OR_NULL(genpd)) | |
1889 | return; | |
1890 | ||
5063ce15 RW |
1891 | INIT_LIST_HEAD(&genpd->master_links); |
1892 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1893 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1894 | mutex_init(&genpd->lock); |
1895 | genpd->gov = gov; | |
1896 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1897 | genpd->in_progress = 0; | |
c4bb3160 | 1898 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1899 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1900 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1901 | genpd->poweroff_task = NULL; |
1902 | genpd->resume_count = 0; | |
596ba34b | 1903 | genpd->device_count = 0; |
221e9b58 | 1904 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1905 | genpd->max_off_time_changed = true; |
f721889f RW |
1906 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1907 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
1908 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; | |
596ba34b RW |
1909 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1910 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1911 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1912 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1913 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1914 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1915 | genpd->domain.ops.resume = pm_genpd_resume; |
1916 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1917 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1918 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1919 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1920 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1921 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1922 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1923 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1924 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1925 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1926 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1927 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1928 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1929 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1930 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c9914854 RW |
1931 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
1932 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; | |
1933 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; | |
1934 | genpd->dev_ops.resume = pm_genpd_default_resume; | |
d23b9b00 RW |
1935 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
1936 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; | |
1937 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; | |
1938 | genpd->dev_ops.thaw = pm_genpd_default_thaw; | |
5125bbf3 RW |
1939 | mutex_lock(&gpd_list_lock); |
1940 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1941 | mutex_unlock(&gpd_list_lock); | |
1942 | } |