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 | ||
f721889f RW |
9 | #include <linux/kernel.h> |
10 | #include <linux/io.h> | |
11 | #include <linux/pm_runtime.h> | |
12 | #include <linux/pm_domain.h> | |
6ff7bb0d | 13 | #include <linux/pm_qos.h> |
f721889f RW |
14 | #include <linux/slab.h> |
15 | #include <linux/err.h> | |
17b75eca RW |
16 | #include <linux/sched.h> |
17 | #include <linux/suspend.h> | |
d5e4cbfe RW |
18 | #include <linux/export.h> |
19 | ||
20 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
21 | ({ \ | |
22 | type (*__routine)(struct device *__d); \ | |
23 | type __ret = (type)0; \ | |
24 | \ | |
25 | __routine = genpd->dev_ops.callback; \ | |
26 | if (__routine) { \ | |
27 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
28 | } \ |
29 | __ret; \ | |
30 | }) | |
f721889f | 31 | |
0140d8bd RW |
32 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
33 | ({ \ | |
34 | ktime_t __start = ktime_get(); \ | |
35 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
36 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
37 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
38 | if (!__retval && __elapsed > __td->field) { \ | |
39 | __td->field = __elapsed; \ | |
7d1af287 | 40 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 41 | __elapsed); \ |
6ff7bb0d RW |
42 | genpd->max_off_time_changed = true; \ |
43 | __td->constraint_changed = true; \ | |
0140d8bd RW |
44 | } \ |
45 | __retval; \ | |
46 | }) | |
47 | ||
5125bbf3 RW |
48 | static LIST_HEAD(gpd_list); |
49 | static DEFINE_MUTEX(gpd_list_lock); | |
50 | ||
8bc0251d RW |
51 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
52 | { | |
53 | struct generic_pm_domain *genpd = NULL, *gpd; | |
54 | ||
55 | if (IS_ERR_OR_NULL(domain_name)) | |
56 | return NULL; | |
57 | ||
58 | mutex_lock(&gpd_list_lock); | |
59 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
60 | if (!strcmp(gpd->name, domain_name)) { | |
61 | genpd = gpd; | |
62 | break; | |
63 | } | |
64 | } | |
65 | mutex_unlock(&gpd_list_lock); | |
66 | return genpd; | |
67 | } | |
68 | ||
b02c999a | 69 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
70 | { |
71 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
72 | return ERR_PTR(-EINVAL); | |
73 | ||
596ba34b | 74 | return pd_to_genpd(dev->pm_domain); |
5248051b | 75 | } |
f721889f | 76 | |
d5e4cbfe RW |
77 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
78 | { | |
0140d8bd RW |
79 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
80 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
81 | } |
82 | ||
83 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
84 | { | |
0140d8bd RW |
85 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
86 | start_latency_ns, "start"); | |
d5e4cbfe RW |
87 | } |
88 | ||
c4bb3160 | 89 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 90 | { |
c4bb3160 RW |
91 | bool ret = false; |
92 | ||
93 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
94 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
100 | { | |
101 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 102 | smp_mb__after_atomic(); |
f721889f RW |
103 | } |
104 | ||
17b75eca RW |
105 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
106 | { | |
107 | DEFINE_WAIT(wait); | |
108 | ||
109 | mutex_lock(&genpd->lock); | |
110 | /* | |
111 | * Wait for the domain to transition into either the active, | |
112 | * or the power off state. | |
113 | */ | |
114 | for (;;) { | |
115 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
116 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
117 | if (genpd->status == GPD_STATE_ACTIVE |
118 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
119 | break; |
120 | mutex_unlock(&genpd->lock); | |
121 | ||
122 | schedule(); | |
123 | ||
124 | mutex_lock(&genpd->lock); | |
125 | } | |
126 | finish_wait(&genpd->status_wait_queue, &wait); | |
127 | } | |
128 | ||
129 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
130 | { | |
131 | mutex_unlock(&genpd->lock); | |
132 | } | |
133 | ||
c6d22b37 RW |
134 | static void genpd_set_active(struct generic_pm_domain *genpd) |
135 | { | |
136 | if (genpd->resume_count == 0) | |
137 | genpd->status = GPD_STATE_ACTIVE; | |
138 | } | |
139 | ||
cbc9ef02 RW |
140 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
141 | { | |
142 | s64 usecs64; | |
143 | ||
144 | if (!genpd->cpu_data) | |
145 | return; | |
146 | ||
147 | usecs64 = genpd->power_on_latency_ns; | |
148 | do_div(usecs64, NSEC_PER_USEC); | |
149 | usecs64 += genpd->cpu_data->saved_exit_latency; | |
150 | genpd->cpu_data->idle_state->exit_latency = usecs64; | |
151 | } | |
152 | ||
5248051b | 153 | /** |
5063ce15 | 154 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
155 | * @genpd: PM domain to power up. |
156 | * | |
5063ce15 | 157 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
158 | * resume a device belonging to it. |
159 | */ | |
8951ef02 | 160 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 161 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 162 | { |
5063ce15 | 163 | struct gpd_link *link; |
3f241775 | 164 | DEFINE_WAIT(wait); |
5248051b RW |
165 | int ret = 0; |
166 | ||
5063ce15 | 167 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
168 | for (;;) { |
169 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
170 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 171 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
172 | break; |
173 | mutex_unlock(&genpd->lock); | |
17b75eca | 174 | |
3f241775 RW |
175 | schedule(); |
176 | ||
177 | mutex_lock(&genpd->lock); | |
178 | } | |
179 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 180 | |
17b75eca | 181 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 182 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 183 | return 0; |
5248051b | 184 | |
c6d22b37 RW |
185 | if (genpd->status != GPD_STATE_POWER_OFF) { |
186 | genpd_set_active(genpd); | |
3f241775 | 187 | return 0; |
c6d22b37 RW |
188 | } |
189 | ||
cbc9ef02 RW |
190 | if (genpd->cpu_data) { |
191 | cpuidle_pause_and_lock(); | |
192 | genpd->cpu_data->idle_state->disabled = true; | |
193 | cpuidle_resume_and_unlock(); | |
194 | goto out; | |
195 | } | |
196 | ||
5063ce15 RW |
197 | /* |
198 | * The list is guaranteed not to change while the loop below is being | |
199 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
200 | * with it. | |
201 | */ | |
202 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
203 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 204 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 205 | |
5248051b | 206 | mutex_unlock(&genpd->lock); |
5248051b | 207 | |
5063ce15 | 208 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
209 | |
210 | mutex_lock(&genpd->lock); | |
211 | ||
3f241775 RW |
212 | /* |
213 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 214 | * while the master is powering on. |
3f241775 RW |
215 | */ |
216 | genpd->status = GPD_STATE_POWER_OFF; | |
217 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
218 | if (ret) { |
219 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 220 | goto err; |
5063ce15 | 221 | } |
5248051b RW |
222 | } |
223 | ||
9e08cf42 | 224 | if (genpd->power_on) { |
0140d8bd RW |
225 | ktime_t time_start = ktime_get(); |
226 | s64 elapsed_ns; | |
227 | ||
fe202fde | 228 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
229 | if (ret) |
230 | goto err; | |
0140d8bd RW |
231 | |
232 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 233 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 234 | genpd->power_on_latency_ns = elapsed_ns; |
6ff7bb0d | 235 | genpd->max_off_time_changed = true; |
cbc9ef02 | 236 | genpd_recalc_cpu_exit_latency(genpd); |
e84b2c20 RW |
237 | if (genpd->name) |
238 | pr_warning("%s: Power-on latency exceeded, " | |
239 | "new value %lld ns\n", genpd->name, | |
240 | elapsed_ns); | |
241 | } | |
3c07cbc4 | 242 | } |
5248051b | 243 | |
cbc9ef02 | 244 | out: |
9e08cf42 RW |
245 | genpd_set_active(genpd); |
246 | ||
3f241775 | 247 | return 0; |
9e08cf42 RW |
248 | |
249 | err: | |
5063ce15 RW |
250 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
251 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 252 | |
3f241775 RW |
253 | return ret; |
254 | } | |
255 | ||
256 | /** | |
5063ce15 | 257 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
258 | * @genpd: PM domain to power up. |
259 | */ | |
260 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
261 | { | |
262 | int ret; | |
263 | ||
264 | mutex_lock(&genpd->lock); | |
265 | ret = __pm_genpd_poweron(genpd); | |
266 | mutex_unlock(&genpd->lock); | |
267 | return ret; | |
5248051b RW |
268 | } |
269 | ||
8bc0251d RW |
270 | /** |
271 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
272 | * @domain_name: Name of the PM domain to power up. | |
273 | */ | |
274 | int pm_genpd_name_poweron(const char *domain_name) | |
275 | { | |
276 | struct generic_pm_domain *genpd; | |
277 | ||
278 | genpd = pm_genpd_lookup_name(domain_name); | |
279 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
280 | } | |
281 | ||
5248051b RW |
282 | #ifdef CONFIG_PM_RUNTIME |
283 | ||
b3d3b9fb SK |
284 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
285 | struct device *dev) | |
286 | { | |
287 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
288 | } | |
289 | ||
8e9afafd RW |
290 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
291 | { | |
292 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
293 | save_state_latency_ns, "state save"); | |
294 | } | |
295 | ||
296 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
297 | { | |
298 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
299 | restore_state_latency_ns, | |
300 | "state restore"); | |
301 | } | |
302 | ||
6ff7bb0d RW |
303 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
304 | unsigned long val, void *ptr) | |
305 | { | |
306 | struct generic_pm_domain_data *gpd_data; | |
307 | struct device *dev; | |
308 | ||
309 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
310 | ||
311 | mutex_lock(&gpd_data->lock); | |
312 | dev = gpd_data->base.dev; | |
313 | if (!dev) { | |
314 | mutex_unlock(&gpd_data->lock); | |
315 | return NOTIFY_DONE; | |
316 | } | |
317 | mutex_unlock(&gpd_data->lock); | |
318 | ||
319 | for (;;) { | |
320 | struct generic_pm_domain *genpd; | |
321 | struct pm_domain_data *pdd; | |
322 | ||
323 | spin_lock_irq(&dev->power.lock); | |
324 | ||
325 | pdd = dev->power.subsys_data ? | |
326 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 327 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
328 | to_gpd_data(pdd)->td.constraint_changed = true; |
329 | genpd = dev_to_genpd(dev); | |
330 | } else { | |
331 | genpd = ERR_PTR(-ENODATA); | |
332 | } | |
333 | ||
334 | spin_unlock_irq(&dev->power.lock); | |
335 | ||
336 | if (!IS_ERR(genpd)) { | |
337 | mutex_lock(&genpd->lock); | |
338 | genpd->max_off_time_changed = true; | |
339 | mutex_unlock(&genpd->lock); | |
340 | } | |
341 | ||
342 | dev = dev->parent; | |
343 | if (!dev || dev->power.ignore_children) | |
344 | break; | |
345 | } | |
346 | ||
347 | return NOTIFY_DONE; | |
348 | } | |
349 | ||
f721889f RW |
350 | /** |
351 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 352 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
353 | * @genpd: PM domain the device belongs to. |
354 | */ | |
4605ab65 | 355 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 356 | struct generic_pm_domain *genpd) |
17b75eca | 357 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 358 | { |
cd0ea672 | 359 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 360 | struct device *dev = pdd->dev; |
f721889f RW |
361 | int ret = 0; |
362 | ||
cd0ea672 | 363 | if (gpd_data->need_restore) |
f721889f RW |
364 | return 0; |
365 | ||
17b75eca RW |
366 | mutex_unlock(&genpd->lock); |
367 | ||
ecf00475 RW |
368 | genpd_start_dev(genpd, dev); |
369 | ret = genpd_save_dev(genpd, dev); | |
370 | genpd_stop_dev(genpd, dev); | |
f721889f | 371 | |
17b75eca RW |
372 | mutex_lock(&genpd->lock); |
373 | ||
f721889f | 374 | if (!ret) |
cd0ea672 | 375 | gpd_data->need_restore = true; |
f721889f RW |
376 | |
377 | return ret; | |
378 | } | |
379 | ||
380 | /** | |
381 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 382 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
383 | * @genpd: PM domain the device belongs to. |
384 | */ | |
4605ab65 | 385 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 386 | struct generic_pm_domain *genpd) |
17b75eca | 387 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 388 | { |
cd0ea672 | 389 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 390 | struct device *dev = pdd->dev; |
80de3d7f | 391 | bool need_restore = gpd_data->need_restore; |
f721889f | 392 | |
80de3d7f | 393 | gpd_data->need_restore = false; |
17b75eca RW |
394 | mutex_unlock(&genpd->lock); |
395 | ||
ecf00475 | 396 | genpd_start_dev(genpd, dev); |
80de3d7f RW |
397 | if (need_restore) |
398 | genpd_restore_dev(genpd, dev); | |
f721889f | 399 | |
17b75eca | 400 | mutex_lock(&genpd->lock); |
f721889f RW |
401 | } |
402 | ||
c6d22b37 RW |
403 | /** |
404 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
405 | * @genpd: PM domain to check. | |
406 | * | |
407 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
408 | * a "power off" operation, which means that a "power on" has occured in the | |
409 | * meantime, or if its resume_count field is different from zero, which means | |
410 | * that one of its devices has been resumed in the meantime. | |
411 | */ | |
412 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
413 | { | |
17877eb5 | 414 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 415 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
416 | } |
417 | ||
56375fd4 RW |
418 | /** |
419 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
420 | * @genpd: PM domait to power off. | |
421 | * | |
422 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
423 | * before. | |
424 | */ | |
d971f0b0 | 425 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 426 | { |
a4ca26a4 | 427 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
428 | } |
429 | ||
f721889f RW |
430 | /** |
431 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
432 | * @genpd: PM domain to power down. | |
433 | * | |
434 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
435 | * have been powered down, run the runtime suspend callbacks provided by all of | |
436 | * the @genpd's devices' drivers and remove power from @genpd. | |
437 | */ | |
438 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 439 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 440 | { |
4605ab65 | 441 | struct pm_domain_data *pdd; |
5063ce15 | 442 | struct gpd_link *link; |
f721889f | 443 | unsigned int not_suspended; |
c6d22b37 | 444 | int ret = 0; |
f721889f | 445 | |
c6d22b37 RW |
446 | start: |
447 | /* | |
448 | * Do not try to power off the domain in the following situations: | |
449 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 450 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 451 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 452 | * (4) System suspend is in progress. |
c6d22b37 | 453 | */ |
3f241775 | 454 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 455 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 456 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
457 | return 0; |
458 | ||
c4bb3160 | 459 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
460 | return -EBUSY; |
461 | ||
462 | not_suspended = 0; | |
34b1f762 RW |
463 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
464 | enum pm_qos_flags_status stat; | |
465 | ||
466 | stat = dev_pm_qos_flags(pdd->dev, | |
467 | PM_QOS_FLAG_NO_POWER_OFF | |
468 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
469 | if (stat > PM_QOS_FLAGS_NONE) | |
470 | return -EBUSY; | |
471 | ||
0aa2a221 | 472 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 473 | || pdd->dev->power.irq_safe)) |
f721889f | 474 | not_suspended++; |
34b1f762 | 475 | } |
f721889f RW |
476 | |
477 | if (not_suspended > genpd->in_progress) | |
478 | return -EBUSY; | |
479 | ||
c6d22b37 RW |
480 | if (genpd->poweroff_task) { |
481 | /* | |
482 | * Another instance of pm_genpd_poweroff() is executing | |
483 | * callbacks, so tell it to start over and return. | |
484 | */ | |
485 | genpd->status = GPD_STATE_REPEAT; | |
486 | return 0; | |
487 | } | |
488 | ||
f721889f RW |
489 | if (genpd->gov && genpd->gov->power_down_ok) { |
490 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
491 | return -EAGAIN; | |
492 | } | |
493 | ||
17b75eca | 494 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 495 | genpd->poweroff_task = current; |
17b75eca | 496 | |
4605ab65 | 497 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 498 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 499 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
500 | |
501 | if (genpd_abort_poweroff(genpd)) | |
502 | goto out; | |
503 | ||
697a7f37 RW |
504 | if (ret) { |
505 | genpd_set_active(genpd); | |
506 | goto out; | |
507 | } | |
f721889f | 508 | |
c6d22b37 RW |
509 | if (genpd->status == GPD_STATE_REPEAT) { |
510 | genpd->poweroff_task = NULL; | |
511 | goto start; | |
512 | } | |
513 | } | |
17b75eca | 514 | |
cbc9ef02 RW |
515 | if (genpd->cpu_data) { |
516 | /* | |
517 | * If cpu_data is set, cpuidle should turn the domain off when | |
518 | * the CPU in it is idle. In that case we don't decrement the | |
519 | * subdomain counts of the master domains, so that power is not | |
520 | * removed from the current domain prematurely as a result of | |
521 | * cutting off the masters' power. | |
522 | */ | |
523 | genpd->status = GPD_STATE_POWER_OFF; | |
524 | cpuidle_pause_and_lock(); | |
525 | genpd->cpu_data->idle_state->disabled = false; | |
526 | cpuidle_resume_and_unlock(); | |
527 | goto out; | |
528 | } | |
529 | ||
3c07cbc4 | 530 | if (genpd->power_off) { |
0140d8bd RW |
531 | ktime_t time_start; |
532 | s64 elapsed_ns; | |
533 | ||
3c07cbc4 RW |
534 | if (atomic_read(&genpd->sd_count) > 0) { |
535 | ret = -EBUSY; | |
c6d22b37 RW |
536 | goto out; |
537 | } | |
17b75eca | 538 | |
0140d8bd RW |
539 | time_start = ktime_get(); |
540 | ||
3c07cbc4 | 541 | /* |
5063ce15 RW |
542 | * If sd_count > 0 at this point, one of the subdomains hasn't |
543 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
544 | * incrementing it. In that case pm_genpd_poweron() will wait |
545 | * for us to drop the lock, so we can call .power_off() and let | |
546 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
547 | * happen very often). | |
548 | */ | |
d2805402 RW |
549 | ret = genpd->power_off(genpd); |
550 | if (ret == -EBUSY) { | |
551 | genpd_set_active(genpd); | |
d2805402 RW |
552 | goto out; |
553 | } | |
0140d8bd RW |
554 | |
555 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 556 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 557 | genpd->power_off_latency_ns = elapsed_ns; |
6ff7bb0d | 558 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
559 | if (genpd->name) |
560 | pr_warning("%s: Power-off latency exceeded, " | |
561 | "new value %lld ns\n", genpd->name, | |
562 | elapsed_ns); | |
563 | } | |
d2805402 | 564 | } |
f721889f | 565 | |
17b75eca | 566 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 567 | |
5063ce15 RW |
568 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
569 | genpd_sd_counter_dec(link->master); | |
570 | genpd_queue_power_off_work(link->master); | |
571 | } | |
f721889f | 572 | |
c6d22b37 RW |
573 | out: |
574 | genpd->poweroff_task = NULL; | |
575 | wake_up_all(&genpd->status_wait_queue); | |
576 | return ret; | |
f721889f RW |
577 | } |
578 | ||
579 | /** | |
580 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
581 | * @work: Work structure used for scheduling the execution of this function. | |
582 | */ | |
583 | static void genpd_power_off_work_fn(struct work_struct *work) | |
584 | { | |
585 | struct generic_pm_domain *genpd; | |
586 | ||
587 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
588 | ||
17b75eca | 589 | genpd_acquire_lock(genpd); |
f721889f | 590 | pm_genpd_poweroff(genpd); |
17b75eca | 591 | genpd_release_lock(genpd); |
f721889f RW |
592 | } |
593 | ||
594 | /** | |
595 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
596 | * @dev: Device to suspend. | |
597 | * | |
598 | * Carry out a runtime suspend of a device under the assumption that its | |
599 | * pm_domain field points to the domain member of an object of type | |
600 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
601 | */ | |
602 | static int pm_genpd_runtime_suspend(struct device *dev) | |
603 | { | |
604 | struct generic_pm_domain *genpd; | |
b02c999a | 605 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 606 | int ret; |
f721889f RW |
607 | |
608 | dev_dbg(dev, "%s()\n", __func__); | |
609 | ||
5248051b RW |
610 | genpd = dev_to_genpd(dev); |
611 | if (IS_ERR(genpd)) | |
f721889f RW |
612 | return -EINVAL; |
613 | ||
b02c999a RW |
614 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
615 | if (stop_ok && !stop_ok(dev)) | |
616 | return -EBUSY; | |
617 | ||
d5e4cbfe RW |
618 | ret = genpd_stop_dev(genpd, dev); |
619 | if (ret) | |
620 | return ret; | |
17b75eca | 621 | |
0aa2a221 RW |
622 | /* |
623 | * If power.irq_safe is set, this routine will be run with interrupts | |
624 | * off, so it can't use mutexes. | |
625 | */ | |
626 | if (dev->power.irq_safe) | |
627 | return 0; | |
628 | ||
c6d22b37 | 629 | mutex_lock(&genpd->lock); |
f721889f RW |
630 | genpd->in_progress++; |
631 | pm_genpd_poweroff(genpd); | |
632 | genpd->in_progress--; | |
c6d22b37 | 633 | mutex_unlock(&genpd->lock); |
f721889f RW |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
f721889f RW |
638 | /** |
639 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
640 | * @dev: Device to resume. | |
641 | * | |
642 | * Carry out a runtime resume of a device under the assumption that its | |
643 | * pm_domain field points to the domain member of an object of type | |
644 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
645 | */ | |
646 | static int pm_genpd_runtime_resume(struct device *dev) | |
647 | { | |
648 | struct generic_pm_domain *genpd; | |
c6d22b37 | 649 | DEFINE_WAIT(wait); |
f721889f RW |
650 | int ret; |
651 | ||
652 | dev_dbg(dev, "%s()\n", __func__); | |
653 | ||
5248051b RW |
654 | genpd = dev_to_genpd(dev); |
655 | if (IS_ERR(genpd)) | |
f721889f RW |
656 | return -EINVAL; |
657 | ||
0aa2a221 RW |
658 | /* If power.irq_safe, the PM domain is never powered off. */ |
659 | if (dev->power.irq_safe) | |
e2e3e4e5 | 660 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 661 | |
c6d22b37 | 662 | mutex_lock(&genpd->lock); |
3f241775 RW |
663 | ret = __pm_genpd_poweron(genpd); |
664 | if (ret) { | |
665 | mutex_unlock(&genpd->lock); | |
666 | return ret; | |
667 | } | |
17b75eca | 668 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
669 | genpd->resume_count++; |
670 | for (;;) { | |
671 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
672 | TASK_UNINTERRUPTIBLE); | |
673 | /* | |
674 | * If current is the powering off task, we have been called | |
675 | * reentrantly from one of the device callbacks, so we should | |
676 | * not wait. | |
677 | */ | |
678 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
679 | break; | |
680 | mutex_unlock(&genpd->lock); | |
681 | ||
682 | schedule(); | |
683 | ||
684 | mutex_lock(&genpd->lock); | |
685 | } | |
686 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 687 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
688 | genpd->resume_count--; |
689 | genpd_set_active(genpd); | |
17b75eca | 690 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 691 | mutex_unlock(&genpd->lock); |
17b75eca | 692 | |
f721889f RW |
693 | return 0; |
694 | } | |
695 | ||
39ac5ba5 TB |
696 | static bool pd_ignore_unused; |
697 | static int __init pd_ignore_unused_setup(char *__unused) | |
698 | { | |
699 | pd_ignore_unused = true; | |
700 | return 1; | |
701 | } | |
702 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
703 | ||
17f2ae7f RW |
704 | /** |
705 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
706 | */ | |
707 | void pm_genpd_poweroff_unused(void) | |
708 | { | |
709 | struct generic_pm_domain *genpd; | |
710 | ||
39ac5ba5 TB |
711 | if (pd_ignore_unused) { |
712 | pr_warn("genpd: Not disabling unused power domains\n"); | |
713 | return; | |
714 | } | |
715 | ||
17f2ae7f RW |
716 | mutex_lock(&gpd_list_lock); |
717 | ||
718 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
719 | genpd_queue_power_off_work(genpd); | |
720 | ||
721 | mutex_unlock(&gpd_list_lock); | |
722 | } | |
723 | ||
f721889f RW |
724 | #else |
725 | ||
6ff7bb0d RW |
726 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
727 | unsigned long val, void *ptr) | |
728 | { | |
729 | return NOTIFY_DONE; | |
730 | } | |
731 | ||
d971f0b0 UH |
732 | static inline void |
733 | genpd_queue_power_off_work(struct generic_pm_domain *genpd) {} | |
734 | ||
f721889f RW |
735 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
736 | ||
737 | #define pm_genpd_runtime_suspend NULL | |
738 | #define pm_genpd_runtime_resume NULL | |
739 | ||
740 | #endif /* CONFIG_PM_RUNTIME */ | |
741 | ||
596ba34b RW |
742 | #ifdef CONFIG_PM_SLEEP |
743 | ||
77f827de RW |
744 | /** |
745 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
746 | * @genpd: PM domain to check. | |
747 | */ | |
748 | static bool pm_genpd_present(struct generic_pm_domain *genpd) | |
749 | { | |
750 | struct generic_pm_domain *gpd; | |
751 | ||
752 | if (IS_ERR_OR_NULL(genpd)) | |
753 | return false; | |
754 | ||
755 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
756 | if (gpd == genpd) | |
757 | return true; | |
758 | ||
759 | return false; | |
760 | } | |
761 | ||
d5e4cbfe RW |
762 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
763 | struct device *dev) | |
764 | { | |
765 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
766 | } | |
767 | ||
596ba34b | 768 | /** |
5063ce15 | 769 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
770 | * @genpd: PM domain to power off, if possible. |
771 | * | |
772 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 773 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 774 | * |
77f827de RW |
775 | * This function is only called in "noirq" and "syscore" stages of system power |
776 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
777 | * executed sequentially, so it is guaranteed that it will never run twice in | |
778 | * parallel). | |
596ba34b RW |
779 | */ |
780 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
781 | { | |
5063ce15 | 782 | struct gpd_link *link; |
596ba34b | 783 | |
17b75eca | 784 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
785 | return; |
786 | ||
c4bb3160 RW |
787 | if (genpd->suspended_count != genpd->device_count |
788 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
789 | return; |
790 | ||
791 | if (genpd->power_off) | |
792 | genpd->power_off(genpd); | |
793 | ||
17b75eca | 794 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
795 | |
796 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
797 | genpd_sd_counter_dec(link->master); | |
798 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
799 | } |
800 | } | |
801 | ||
802d8b49 RW |
802 | /** |
803 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
804 | * @genpd: PM domain to power on. | |
805 | * | |
77f827de RW |
806 | * This function is only called in "noirq" and "syscore" stages of system power |
807 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
808 | * executed sequentially, so it is guaranteed that it will never run twice in | |
809 | * parallel). | |
802d8b49 RW |
810 | */ |
811 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
812 | { | |
813 | struct gpd_link *link; | |
814 | ||
815 | if (genpd->status != GPD_STATE_POWER_OFF) | |
816 | return; | |
817 | ||
818 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
819 | pm_genpd_sync_poweron(link->master); | |
820 | genpd_sd_counter_inc(link->master); | |
821 | } | |
822 | ||
823 | if (genpd->power_on) | |
824 | genpd->power_on(genpd); | |
825 | ||
826 | genpd->status = GPD_STATE_ACTIVE; | |
827 | } | |
828 | ||
4ecd6e65 RW |
829 | /** |
830 | * resume_needed - Check whether to resume a device before system suspend. | |
831 | * @dev: Device to check. | |
832 | * @genpd: PM domain the device belongs to. | |
833 | * | |
834 | * There are two cases in which a device that can wake up the system from sleep | |
835 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
836 | * to wake up the system and it has to remain active for this purpose while the | |
837 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
838 | * the system from sleep states and it generally doesn't generate wakeup signals | |
839 | * by itself (those signals are generated on its behalf by other parts of the | |
840 | * system). In the latter case it may be necessary to reconfigure the device's | |
841 | * wakeup settings during system suspend, because it may have been set up to | |
842 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
843 | * Return 'true' in either of the above cases. | |
844 | */ | |
845 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
846 | { | |
847 | bool active_wakeup; | |
848 | ||
849 | if (!device_can_wakeup(dev)) | |
850 | return false; | |
851 | ||
d5e4cbfe | 852 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
853 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
854 | } | |
855 | ||
596ba34b RW |
856 | /** |
857 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
858 | * @dev: Device to start the transition of. | |
859 | * | |
860 | * Start a power transition of a device (during a system-wide power transition) | |
861 | * under the assumption that its pm_domain field points to the domain member of | |
862 | * an object of type struct generic_pm_domain representing a PM domain | |
863 | * consisting of I/O devices. | |
864 | */ | |
865 | static int pm_genpd_prepare(struct device *dev) | |
866 | { | |
867 | struct generic_pm_domain *genpd; | |
b6c10c84 | 868 | int ret; |
596ba34b RW |
869 | |
870 | dev_dbg(dev, "%s()\n", __func__); | |
871 | ||
872 | genpd = dev_to_genpd(dev); | |
873 | if (IS_ERR(genpd)) | |
874 | return -EINVAL; | |
875 | ||
17b75eca RW |
876 | /* |
877 | * If a wakeup request is pending for the device, it should be woken up | |
878 | * at this point and a system wakeup event should be reported if it's | |
879 | * set up to wake up the system from sleep states. | |
880 | */ | |
881 | pm_runtime_get_noresume(dev); | |
882 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
883 | pm_wakeup_event(dev, 0); | |
884 | ||
885 | if (pm_wakeup_pending()) { | |
84167035 | 886 | pm_runtime_put(dev); |
17b75eca RW |
887 | return -EBUSY; |
888 | } | |
889 | ||
4ecd6e65 RW |
890 | if (resume_needed(dev, genpd)) |
891 | pm_runtime_resume(dev); | |
892 | ||
17b75eca | 893 | genpd_acquire_lock(genpd); |
596ba34b | 894 | |
65533bbf RW |
895 | if (genpd->prepared_count++ == 0) { |
896 | genpd->suspended_count = 0; | |
17b75eca | 897 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 898 | } |
17b75eca RW |
899 | |
900 | genpd_release_lock(genpd); | |
596ba34b RW |
901 | |
902 | if (genpd->suspend_power_off) { | |
17b75eca | 903 | pm_runtime_put_noidle(dev); |
596ba34b RW |
904 | return 0; |
905 | } | |
906 | ||
907 | /* | |
17b75eca RW |
908 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
909 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 910 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 911 | * to make it operational. |
596ba34b | 912 | */ |
17b75eca | 913 | pm_runtime_resume(dev); |
596ba34b RW |
914 | __pm_runtime_disable(dev, false); |
915 | ||
b6c10c84 RW |
916 | ret = pm_generic_prepare(dev); |
917 | if (ret) { | |
918 | mutex_lock(&genpd->lock); | |
919 | ||
920 | if (--genpd->prepared_count == 0) | |
921 | genpd->suspend_power_off = false; | |
922 | ||
923 | mutex_unlock(&genpd->lock); | |
17b75eca | 924 | pm_runtime_enable(dev); |
b6c10c84 | 925 | } |
17b75eca | 926 | |
84167035 | 927 | pm_runtime_put(dev); |
b6c10c84 | 928 | return ret; |
596ba34b RW |
929 | } |
930 | ||
931 | /** | |
932 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
933 | * @dev: Device to suspend. | |
934 | * | |
935 | * Suspend a device under the assumption that its pm_domain field points to the | |
936 | * domain member of an object of type struct generic_pm_domain representing | |
937 | * a PM domain consisting of I/O devices. | |
938 | */ | |
939 | static int pm_genpd_suspend(struct device *dev) | |
940 | { | |
941 | struct generic_pm_domain *genpd; | |
942 | ||
943 | dev_dbg(dev, "%s()\n", __func__); | |
944 | ||
945 | genpd = dev_to_genpd(dev); | |
946 | if (IS_ERR(genpd)) | |
947 | return -EINVAL; | |
948 | ||
1e0407ca | 949 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
950 | } |
951 | ||
952 | /** | |
0496c8ae | 953 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
954 | * @dev: Device to suspend. |
955 | * | |
956 | * Carry out a late suspend of a device under the assumption that its | |
957 | * pm_domain field points to the domain member of an object of type | |
958 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
959 | */ | |
0496c8ae | 960 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
961 | { |
962 | struct generic_pm_domain *genpd; | |
596ba34b RW |
963 | |
964 | dev_dbg(dev, "%s()\n", __func__); | |
965 | ||
966 | genpd = dev_to_genpd(dev); | |
967 | if (IS_ERR(genpd)) | |
968 | return -EINVAL; | |
969 | ||
1e0407ca | 970 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 971 | } |
596ba34b | 972 | |
0496c8ae RW |
973 | /** |
974 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
975 | * @dev: Device to suspend. | |
976 | * | |
977 | * Stop the device and remove power from the domain if all devices in it have | |
978 | * been stopped. | |
979 | */ | |
980 | static int pm_genpd_suspend_noirq(struct device *dev) | |
981 | { | |
982 | struct generic_pm_domain *genpd; | |
983 | ||
984 | dev_dbg(dev, "%s()\n", __func__); | |
985 | ||
986 | genpd = dev_to_genpd(dev); | |
987 | if (IS_ERR(genpd)) | |
988 | return -EINVAL; | |
596ba34b | 989 | |
dbf37414 | 990 | if (genpd->suspend_power_off |
0496c8ae | 991 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
992 | return 0; |
993 | ||
d5e4cbfe | 994 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
995 | |
996 | /* | |
997 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
998 | * guaranteed that this function will never run twice in parallel for | |
999 | * the same PM domain, so it is not necessary to use locking here. | |
1000 | */ | |
1001 | genpd->suspended_count++; | |
1002 | pm_genpd_sync_poweroff(genpd); | |
1003 | ||
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /** | |
0496c8ae | 1008 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1009 | * @dev: Device to resume. |
1010 | * | |
0496c8ae | 1011 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1012 | */ |
1013 | static int pm_genpd_resume_noirq(struct device *dev) | |
1014 | { | |
1015 | struct generic_pm_domain *genpd; | |
1016 | ||
1017 | dev_dbg(dev, "%s()\n", __func__); | |
1018 | ||
1019 | genpd = dev_to_genpd(dev); | |
1020 | if (IS_ERR(genpd)) | |
1021 | return -EINVAL; | |
1022 | ||
dbf37414 | 1023 | if (genpd->suspend_power_off |
cc85b207 | 1024 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1025 | return 0; |
1026 | ||
1027 | /* | |
1028 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1029 | * guaranteed that this function will never run twice in parallel for | |
1030 | * the same PM domain, so it is not necessary to use locking here. | |
1031 | */ | |
802d8b49 | 1032 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1033 | genpd->suspended_count--; |
596ba34b | 1034 | |
0496c8ae | 1035 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1036 | } |
1037 | ||
1038 | /** | |
0496c8ae RW |
1039 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1040 | * @dev: Device to resume. | |
1041 | * | |
1042 | * Carry out an early resume of a device under the assumption that its | |
1043 | * pm_domain field points to the domain member of an object of type | |
1044 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1045 | * devices. | |
1046 | */ | |
1047 | static int pm_genpd_resume_early(struct device *dev) | |
1048 | { | |
1049 | struct generic_pm_domain *genpd; | |
1050 | ||
1051 | dev_dbg(dev, "%s()\n", __func__); | |
1052 | ||
1053 | genpd = dev_to_genpd(dev); | |
1054 | if (IS_ERR(genpd)) | |
1055 | return -EINVAL; | |
1056 | ||
1e0407ca | 1057 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1058 | } |
1059 | ||
1060 | /** | |
1061 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1062 | * @dev: Device to resume. |
1063 | * | |
1064 | * Resume a device under the assumption that its pm_domain field points to the | |
1065 | * domain member of an object of type struct generic_pm_domain representing | |
1066 | * a power domain consisting of I/O devices. | |
1067 | */ | |
1068 | static int pm_genpd_resume(struct device *dev) | |
1069 | { | |
1070 | struct generic_pm_domain *genpd; | |
1071 | ||
1072 | dev_dbg(dev, "%s()\n", __func__); | |
1073 | ||
1074 | genpd = dev_to_genpd(dev); | |
1075 | if (IS_ERR(genpd)) | |
1076 | return -EINVAL; | |
1077 | ||
1e0407ca | 1078 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1079 | } |
1080 | ||
1081 | /** | |
0496c8ae | 1082 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1083 | * @dev: Device to freeze. |
1084 | * | |
1085 | * Freeze a device under the assumption that its pm_domain field points to the | |
1086 | * domain member of an object of type struct generic_pm_domain representing | |
1087 | * a power domain consisting of I/O devices. | |
1088 | */ | |
1089 | static int pm_genpd_freeze(struct device *dev) | |
1090 | { | |
1091 | struct generic_pm_domain *genpd; | |
1092 | ||
1093 | dev_dbg(dev, "%s()\n", __func__); | |
1094 | ||
1095 | genpd = dev_to_genpd(dev); | |
1096 | if (IS_ERR(genpd)) | |
1097 | return -EINVAL; | |
1098 | ||
1e0407ca | 1099 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1100 | } |
1101 | ||
1102 | /** | |
0496c8ae RW |
1103 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1104 | * @dev: Device to freeze. | |
1105 | * | |
1106 | * Carry out a late freeze of a device under the assumption that its | |
1107 | * pm_domain field points to the domain member of an object of type | |
1108 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1109 | * devices. | |
1110 | */ | |
1111 | static int pm_genpd_freeze_late(struct device *dev) | |
1112 | { | |
1113 | struct generic_pm_domain *genpd; | |
1114 | ||
1115 | dev_dbg(dev, "%s()\n", __func__); | |
1116 | ||
1117 | genpd = dev_to_genpd(dev); | |
1118 | if (IS_ERR(genpd)) | |
1119 | return -EINVAL; | |
1120 | ||
1e0407ca | 1121 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
1122 | } |
1123 | ||
1124 | /** | |
1125 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1126 | * @dev: Device to freeze. |
1127 | * | |
1128 | * Carry out a late freeze of a device under the assumption that its | |
1129 | * pm_domain field points to the domain member of an object of type | |
1130 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1131 | * devices. | |
1132 | */ | |
1133 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1134 | { | |
1135 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1136 | |
1137 | dev_dbg(dev, "%s()\n", __func__); | |
1138 | ||
1139 | genpd = dev_to_genpd(dev); | |
1140 | if (IS_ERR(genpd)) | |
1141 | return -EINVAL; | |
1142 | ||
dbf37414 | 1143 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1144 | } |
596ba34b | 1145 | |
0496c8ae RW |
1146 | /** |
1147 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1148 | * @dev: Device to thaw. | |
1149 | * | |
1150 | * Start the device, unless power has been removed from the domain already | |
1151 | * before the system transition. | |
1152 | */ | |
1153 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1154 | { | |
1155 | struct generic_pm_domain *genpd; | |
596ba34b | 1156 | |
0496c8ae | 1157 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1158 | |
0496c8ae RW |
1159 | genpd = dev_to_genpd(dev); |
1160 | if (IS_ERR(genpd)) | |
1161 | return -EINVAL; | |
1162 | ||
dbf37414 | 1163 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1164 | } |
1165 | ||
1166 | /** | |
0496c8ae | 1167 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1168 | * @dev: Device to thaw. |
1169 | * | |
1170 | * Carry out an early thaw of a device under the assumption that its | |
1171 | * pm_domain field points to the domain member of an object of type | |
1172 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1173 | * devices. | |
1174 | */ | |
0496c8ae | 1175 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1176 | { |
1177 | struct generic_pm_domain *genpd; | |
1178 | ||
1179 | dev_dbg(dev, "%s()\n", __func__); | |
1180 | ||
1181 | genpd = dev_to_genpd(dev); | |
1182 | if (IS_ERR(genpd)) | |
1183 | return -EINVAL; | |
1184 | ||
1e0407ca | 1185 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1186 | } |
1187 | ||
1188 | /** | |
1189 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1190 | * @dev: Device to thaw. | |
1191 | * | |
1192 | * Thaw a device under the assumption that its pm_domain field points to the | |
1193 | * domain member of an object of type struct generic_pm_domain representing | |
1194 | * a power domain consisting of I/O devices. | |
1195 | */ | |
1196 | static int pm_genpd_thaw(struct device *dev) | |
1197 | { | |
1198 | struct generic_pm_domain *genpd; | |
1199 | ||
1200 | dev_dbg(dev, "%s()\n", __func__); | |
1201 | ||
1202 | genpd = dev_to_genpd(dev); | |
1203 | if (IS_ERR(genpd)) | |
1204 | return -EINVAL; | |
1205 | ||
1e0407ca | 1206 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1207 | } |
1208 | ||
1209 | /** | |
0496c8ae | 1210 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1211 | * @dev: Device to resume. |
1212 | * | |
0496c8ae RW |
1213 | * Make sure the domain will be in the same power state as before the |
1214 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1215 | */ |
1216 | static int pm_genpd_restore_noirq(struct device *dev) | |
1217 | { | |
1218 | struct generic_pm_domain *genpd; | |
1219 | ||
1220 | dev_dbg(dev, "%s()\n", __func__); | |
1221 | ||
1222 | genpd = dev_to_genpd(dev); | |
1223 | if (IS_ERR(genpd)) | |
1224 | return -EINVAL; | |
1225 | ||
1226 | /* | |
1227 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1228 | * guaranteed that this function will never run twice in parallel for | |
1229 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1230 | * |
1231 | * At this point suspended_count == 0 means we are being run for the | |
1232 | * first time for the given domain in the present cycle. | |
596ba34b | 1233 | */ |
65533bbf | 1234 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1235 | /* |
65533bbf | 1236 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1237 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1238 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1239 | */ |
65533bbf RW |
1240 | genpd->status = GPD_STATE_POWER_OFF; |
1241 | if (genpd->suspend_power_off) { | |
1242 | /* | |
1243 | * If the domain was off before the hibernation, make | |
1244 | * sure it will be off going forward. | |
1245 | */ | |
1246 | if (genpd->power_off) | |
1247 | genpd->power_off(genpd); | |
1248 | ||
1249 | return 0; | |
1250 | } | |
596ba34b RW |
1251 | } |
1252 | ||
18dd2ece RW |
1253 | if (genpd->suspend_power_off) |
1254 | return 0; | |
1255 | ||
802d8b49 | 1256 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1257 | |
dbf37414 | 1258 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1259 | } |
1260 | ||
1261 | /** | |
1262 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1263 | * @dev: Device to complete the transition of. | |
1264 | * | |
1265 | * Complete a power transition of a device (during a system-wide power | |
1266 | * transition) under the assumption that its pm_domain field points to the | |
1267 | * domain member of an object of type struct generic_pm_domain representing | |
1268 | * a power domain consisting of I/O devices. | |
1269 | */ | |
1270 | static void pm_genpd_complete(struct device *dev) | |
1271 | { | |
1272 | struct generic_pm_domain *genpd; | |
1273 | bool run_complete; | |
1274 | ||
1275 | dev_dbg(dev, "%s()\n", __func__); | |
1276 | ||
1277 | genpd = dev_to_genpd(dev); | |
1278 | if (IS_ERR(genpd)) | |
1279 | return; | |
1280 | ||
1281 | mutex_lock(&genpd->lock); | |
1282 | ||
1283 | run_complete = !genpd->suspend_power_off; | |
1284 | if (--genpd->prepared_count == 0) | |
1285 | genpd->suspend_power_off = false; | |
1286 | ||
1287 | mutex_unlock(&genpd->lock); | |
1288 | ||
1289 | if (run_complete) { | |
1290 | pm_generic_complete(dev); | |
6f00ff78 | 1291 | pm_runtime_set_active(dev); |
596ba34b | 1292 | pm_runtime_enable(dev); |
af939339 | 1293 | pm_request_idle(dev); |
596ba34b RW |
1294 | } |
1295 | } | |
1296 | ||
77f827de | 1297 | /** |
d47e6464 | 1298 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1299 | * @dev: Device that normally is marked as "always on" to switch power for. |
1300 | * | |
1301 | * This routine may only be called during the system core (syscore) suspend or | |
1302 | * resume phase for devices whose "always on" flags are set. | |
1303 | */ | |
d47e6464 | 1304 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1305 | { |
1306 | struct generic_pm_domain *genpd; | |
1307 | ||
1308 | genpd = dev_to_genpd(dev); | |
1309 | if (!pm_genpd_present(genpd)) | |
1310 | return; | |
1311 | ||
1312 | if (suspend) { | |
1313 | genpd->suspended_count++; | |
1314 | pm_genpd_sync_poweroff(genpd); | |
1315 | } else { | |
1316 | pm_genpd_sync_poweron(genpd); | |
1317 | genpd->suspended_count--; | |
1318 | } | |
1319 | } | |
d47e6464 UH |
1320 | |
1321 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1322 | { | |
1323 | genpd_syscore_switch(dev, true); | |
1324 | } | |
1325 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1326 | ||
1327 | void pm_genpd_syscore_poweron(struct device *dev) | |
1328 | { | |
1329 | genpd_syscore_switch(dev, false); | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1332 | |
596ba34b RW |
1333 | #else |
1334 | ||
1335 | #define pm_genpd_prepare NULL | |
1336 | #define pm_genpd_suspend NULL | |
0496c8ae | 1337 | #define pm_genpd_suspend_late NULL |
596ba34b | 1338 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1339 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1340 | #define pm_genpd_resume_noirq NULL |
1341 | #define pm_genpd_resume NULL | |
1342 | #define pm_genpd_freeze NULL | |
0496c8ae | 1343 | #define pm_genpd_freeze_late NULL |
596ba34b | 1344 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1345 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1346 | #define pm_genpd_thaw_noirq NULL |
1347 | #define pm_genpd_thaw NULL | |
596ba34b | 1348 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1349 | #define pm_genpd_complete NULL |
1350 | ||
1351 | #endif /* CONFIG_PM_SLEEP */ | |
1352 | ||
1d5fcfec RW |
1353 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1354 | { | |
1355 | struct generic_pm_domain_data *gpd_data; | |
1356 | ||
1357 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1358 | if (!gpd_data) | |
1359 | return NULL; | |
1360 | ||
1361 | mutex_init(&gpd_data->lock); | |
1362 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1363 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1364 | return gpd_data; | |
1365 | } | |
1366 | ||
1367 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1368 | struct generic_pm_domain_data *gpd_data) | |
1369 | { | |
1370 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1371 | kfree(gpd_data); | |
1372 | } | |
1373 | ||
f721889f | 1374 | /** |
b02c999a | 1375 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1376 | * @genpd: PM domain to add the device to. |
1377 | * @dev: Device to be added. | |
b02c999a | 1378 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1379 | */ |
b02c999a RW |
1380 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1381 | struct gpd_timing_data *td) | |
f721889f | 1382 | { |
1d5fcfec | 1383 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1384 | struct pm_domain_data *pdd; |
f721889f RW |
1385 | int ret = 0; |
1386 | ||
1387 | dev_dbg(dev, "%s()\n", __func__); | |
1388 | ||
1389 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1390 | return -EINVAL; | |
1391 | ||
1d5fcfec RW |
1392 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1393 | if (!gpd_data_new) | |
6ff7bb0d RW |
1394 | return -ENOMEM; |
1395 | ||
17b75eca | 1396 | genpd_acquire_lock(genpd); |
f721889f | 1397 | |
596ba34b RW |
1398 | if (genpd->prepared_count > 0) { |
1399 | ret = -EAGAIN; | |
1400 | goto out; | |
1401 | } | |
1402 | ||
4605ab65 RW |
1403 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1404 | if (pdd->dev == dev) { | |
f721889f RW |
1405 | ret = -EINVAL; |
1406 | goto out; | |
1407 | } | |
1408 | ||
1d5fcfec RW |
1409 | ret = dev_pm_get_subsys_data(dev); |
1410 | if (ret) | |
1411 | goto out; | |
1412 | ||
596ba34b | 1413 | genpd->device_count++; |
6ff7bb0d | 1414 | genpd->max_off_time_changed = true; |
f721889f | 1415 | |
6ff7bb0d | 1416 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1417 | |
6ff7bb0d | 1418 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1419 | if (dev->power.subsys_data->domain_data) { |
1420 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1421 | } else { | |
1422 | gpd_data = gpd_data_new; | |
1423 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1424 | } | |
1425 | gpd_data->refcount++; | |
b02c999a RW |
1426 | if (td) |
1427 | gpd_data->td = *td; | |
f721889f | 1428 | |
1d5fcfec RW |
1429 | spin_unlock_irq(&dev->power.lock); |
1430 | ||
1431 | mutex_lock(&gpd_data->lock); | |
1432 | gpd_data->base.dev = dev; | |
1433 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
1434 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; | |
6ff7bb0d RW |
1435 | gpd_data->td.constraint_changed = true; |
1436 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1437 | mutex_unlock(&gpd_data->lock); |
1438 | ||
f721889f | 1439 | out: |
17b75eca | 1440 | genpd_release_lock(genpd); |
f721889f | 1441 | |
1d5fcfec RW |
1442 | if (gpd_data != gpd_data_new) |
1443 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1444 | ||
f721889f RW |
1445 | return ret; |
1446 | } | |
1447 | ||
c8aa130b TA |
1448 | /** |
1449 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1450 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1451 | * the device is added to. | |
1452 | * @dev: Device to be added. | |
1453 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1454 | */ | |
1455 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1456 | struct gpd_timing_data *td) | |
1457 | { | |
1458 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1459 | ||
1460 | dev_dbg(dev, "%s()\n", __func__); | |
1461 | ||
1462 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1463 | return -EINVAL; | |
1464 | ||
1465 | mutex_lock(&gpd_list_lock); | |
1466 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1467 | if (gpd->of_node == genpd_node) { | |
1468 | genpd = gpd; | |
1469 | break; | |
1470 | } | |
1471 | } | |
1472 | mutex_unlock(&gpd_list_lock); | |
1473 | ||
1474 | if (!genpd) | |
1475 | return -EINVAL; | |
1476 | ||
1477 | return __pm_genpd_add_device(genpd, dev, td); | |
1478 | } | |
1479 | ||
b5abb085 RW |
1480 | |
1481 | /** | |
1482 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1483 | * @domain_name: Name of the PM domain to add the device to. | |
1484 | * @dev: Device to be added. | |
1485 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1486 | */ | |
1487 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1488 | struct gpd_timing_data *td) | |
1489 | { | |
8bc0251d | 1490 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1491 | } |
1492 | ||
f721889f RW |
1493 | /** |
1494 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1495 | * @genpd: PM domain to remove the device from. | |
1496 | * @dev: Device to be removed. | |
1497 | */ | |
1498 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1499 | struct device *dev) | |
1500 | { | |
6ff7bb0d | 1501 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1502 | struct pm_domain_data *pdd; |
1d5fcfec | 1503 | bool remove = false; |
efa69025 | 1504 | int ret = 0; |
f721889f RW |
1505 | |
1506 | dev_dbg(dev, "%s()\n", __func__); | |
1507 | ||
efa69025 RW |
1508 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1509 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1510 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1511 | return -EINVAL; |
1512 | ||
17b75eca | 1513 | genpd_acquire_lock(genpd); |
f721889f | 1514 | |
596ba34b RW |
1515 | if (genpd->prepared_count > 0) { |
1516 | ret = -EAGAIN; | |
1517 | goto out; | |
1518 | } | |
1519 | ||
6ff7bb0d RW |
1520 | genpd->device_count--; |
1521 | genpd->max_off_time_changed = true; | |
1522 | ||
1523 | spin_lock_irq(&dev->power.lock); | |
1d5fcfec | 1524 | |
efa69025 RW |
1525 | dev->pm_domain = NULL; |
1526 | pdd = dev->power.subsys_data->domain_data; | |
1527 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1528 | gpd_data = to_gpd_data(pdd); |
1529 | if (--gpd_data->refcount == 0) { | |
1530 | dev->power.subsys_data->domain_data = NULL; | |
1531 | remove = true; | |
1532 | } | |
1533 | ||
6ff7bb0d | 1534 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1535 | |
6ff7bb0d RW |
1536 | mutex_lock(&gpd_data->lock); |
1537 | pdd->dev = NULL; | |
1538 | mutex_unlock(&gpd_data->lock); | |
1539 | ||
1540 | genpd_release_lock(genpd); | |
1541 | ||
6ff7bb0d | 1542 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1543 | if (remove) |
1544 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1545 | ||
6ff7bb0d | 1546 | return 0; |
f721889f | 1547 | |
596ba34b | 1548 | out: |
17b75eca | 1549 | genpd_release_lock(genpd); |
f721889f RW |
1550 | |
1551 | return ret; | |
1552 | } | |
1553 | ||
ca1d72f0 RW |
1554 | /** |
1555 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1556 | * @dev: Device to set/unset the flag for. | |
1557 | * @val: The new value of the device's "need restore" flag. | |
1558 | */ | |
1559 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1560 | { | |
1561 | struct pm_subsys_data *psd; | |
1562 | unsigned long flags; | |
1563 | ||
1564 | spin_lock_irqsave(&dev->power.lock, flags); | |
1565 | ||
1566 | psd = dev_to_psd(dev); | |
1567 | if (psd && psd->domain_data) | |
1568 | to_gpd_data(psd->domain_data)->need_restore = val; | |
1569 | ||
1570 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1571 | } | |
1572 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1573 | ||
f721889f RW |
1574 | /** |
1575 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1576 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1577 | * @subdomain: Subdomain to be added. |
f721889f RW |
1578 | */ |
1579 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1580 | struct generic_pm_domain *subdomain) |
f721889f | 1581 | { |
5063ce15 | 1582 | struct gpd_link *link; |
f721889f RW |
1583 | int ret = 0; |
1584 | ||
fb7268be RW |
1585 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1586 | || genpd == subdomain) | |
f721889f RW |
1587 | return -EINVAL; |
1588 | ||
17b75eca RW |
1589 | start: |
1590 | genpd_acquire_lock(genpd); | |
bc0403ff | 1591 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1592 | |
bc0403ff RW |
1593 | if (subdomain->status != GPD_STATE_POWER_OFF |
1594 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1595 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1596 | genpd_release_lock(genpd); |
1597 | goto start; | |
1598 | } | |
1599 | ||
1600 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1601 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1602 | ret = -EINVAL; |
1603 | goto out; | |
1604 | } | |
1605 | ||
4fcac10d | 1606 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1607 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1608 | ret = -EINVAL; |
1609 | goto out; | |
1610 | } | |
1611 | } | |
1612 | ||
5063ce15 RW |
1613 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1614 | if (!link) { | |
1615 | ret = -ENOMEM; | |
1616 | goto out; | |
1617 | } | |
1618 | link->master = genpd; | |
1619 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1620 | link->slave = subdomain; |
1621 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1622 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1623 | genpd_sd_counter_inc(genpd); |
f721889f | 1624 | |
f721889f | 1625 | out: |
bc0403ff | 1626 | mutex_unlock(&subdomain->lock); |
17b75eca | 1627 | genpd_release_lock(genpd); |
f721889f RW |
1628 | |
1629 | return ret; | |
1630 | } | |
1631 | ||
fb7268be RW |
1632 | /** |
1633 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1634 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1635 | * @subdomain_name: Name of the subdomain to be added. | |
1636 | */ | |
1637 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1638 | const char *subdomain_name) | |
1639 | { | |
1640 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1641 | ||
1642 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1643 | return -EINVAL; | |
1644 | ||
1645 | mutex_lock(&gpd_list_lock); | |
1646 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1647 | if (!master && !strcmp(gpd->name, master_name)) | |
1648 | master = gpd; | |
1649 | ||
1650 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1651 | subdomain = gpd; | |
1652 | ||
1653 | if (master && subdomain) | |
1654 | break; | |
1655 | } | |
1656 | mutex_unlock(&gpd_list_lock); | |
1657 | ||
1658 | return pm_genpd_add_subdomain(master, subdomain); | |
1659 | } | |
1660 | ||
f721889f RW |
1661 | /** |
1662 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1663 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1664 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1665 | */ |
1666 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1667 | struct generic_pm_domain *subdomain) |
f721889f | 1668 | { |
5063ce15 | 1669 | struct gpd_link *link; |
f721889f RW |
1670 | int ret = -EINVAL; |
1671 | ||
5063ce15 | 1672 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1673 | return -EINVAL; |
1674 | ||
17b75eca RW |
1675 | start: |
1676 | genpd_acquire_lock(genpd); | |
f721889f | 1677 | |
5063ce15 RW |
1678 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1679 | if (link->slave != subdomain) | |
f721889f RW |
1680 | continue; |
1681 | ||
1682 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1683 | ||
17b75eca RW |
1684 | if (subdomain->status != GPD_STATE_POWER_OFF |
1685 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1686 | mutex_unlock(&subdomain->lock); | |
1687 | genpd_release_lock(genpd); | |
1688 | goto start; | |
1689 | } | |
1690 | ||
5063ce15 RW |
1691 | list_del(&link->master_node); |
1692 | list_del(&link->slave_node); | |
1693 | kfree(link); | |
17b75eca | 1694 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1695 | genpd_sd_counter_dec(genpd); |
1696 | ||
1697 | mutex_unlock(&subdomain->lock); | |
1698 | ||
1699 | ret = 0; | |
1700 | break; | |
1701 | } | |
1702 | ||
17b75eca | 1703 | genpd_release_lock(genpd); |
f721889f RW |
1704 | |
1705 | return ret; | |
1706 | } | |
1707 | ||
40114447 RW |
1708 | /** |
1709 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1710 | * @genpd: PM domain to be connected with cpuidle. | |
1711 | * @state: cpuidle state this domain can disable/enable. | |
1712 | * | |
1713 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1714 | * of calling its power down routine it will enable the given cpuidle state so | |
1715 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1716 | */ | |
1717 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1718 | { |
1719 | struct cpuidle_driver *cpuidle_drv; | |
1720 | struct gpd_cpu_data *cpu_data; | |
1721 | struct cpuidle_state *idle_state; | |
1722 | int ret = 0; | |
1723 | ||
1724 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1725 | return -EINVAL; | |
1726 | ||
1727 | genpd_acquire_lock(genpd); | |
1728 | ||
1729 | if (genpd->cpu_data) { | |
1730 | ret = -EEXIST; | |
1731 | goto out; | |
1732 | } | |
1733 | cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); | |
1734 | if (!cpu_data) { | |
1735 | ret = -ENOMEM; | |
1736 | goto out; | |
1737 | } | |
1738 | cpuidle_drv = cpuidle_driver_ref(); | |
1739 | if (!cpuidle_drv) { | |
1740 | ret = -ENODEV; | |
debe081a | 1741 | goto err_drv; |
cbc9ef02 RW |
1742 | } |
1743 | if (cpuidle_drv->state_count <= state) { | |
1744 | ret = -EINVAL; | |
1745 | goto err; | |
1746 | } | |
1747 | idle_state = &cpuidle_drv->states[state]; | |
1748 | if (!idle_state->disabled) { | |
1749 | ret = -EAGAIN; | |
1750 | goto err; | |
1751 | } | |
1752 | cpu_data->idle_state = idle_state; | |
1753 | cpu_data->saved_exit_latency = idle_state->exit_latency; | |
1754 | genpd->cpu_data = cpu_data; | |
1755 | genpd_recalc_cpu_exit_latency(genpd); | |
1756 | ||
1757 | out: | |
1758 | genpd_release_lock(genpd); | |
1759 | return ret; | |
1760 | ||
1761 | err: | |
1762 | cpuidle_driver_unref(); | |
debe081a | 1763 | |
1764 | err_drv: | |
1765 | kfree(cpu_data); | |
cbc9ef02 RW |
1766 | goto out; |
1767 | } | |
1768 | ||
74a2799a RW |
1769 | /** |
1770 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1771 | * @name: Name of the domain to connect to cpuidle. | |
1772 | * @state: cpuidle state this domain can manipulate. | |
1773 | */ | |
1774 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1775 | { | |
1776 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1777 | } | |
1778 | ||
40114447 RW |
1779 | /** |
1780 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1781 | * @genpd: PM domain to remove the cpuidle connection from. | |
1782 | * | |
1783 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1784 | * given PM domain. | |
1785 | */ | |
1786 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 RW |
1787 | { |
1788 | struct gpd_cpu_data *cpu_data; | |
1789 | struct cpuidle_state *idle_state; | |
1790 | int ret = 0; | |
1791 | ||
1792 | if (IS_ERR_OR_NULL(genpd)) | |
1793 | return -EINVAL; | |
1794 | ||
1795 | genpd_acquire_lock(genpd); | |
1796 | ||
1797 | cpu_data = genpd->cpu_data; | |
1798 | if (!cpu_data) { | |
1799 | ret = -ENODEV; | |
1800 | goto out; | |
1801 | } | |
1802 | idle_state = cpu_data->idle_state; | |
1803 | if (!idle_state->disabled) { | |
1804 | ret = -EAGAIN; | |
1805 | goto out; | |
1806 | } | |
1807 | idle_state->exit_latency = cpu_data->saved_exit_latency; | |
1808 | cpuidle_driver_unref(); | |
1809 | genpd->cpu_data = NULL; | |
1810 | kfree(cpu_data); | |
1811 | ||
1812 | out: | |
1813 | genpd_release_lock(genpd); | |
1814 | return ret; | |
1815 | } | |
1816 | ||
74a2799a RW |
1817 | /** |
1818 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1819 | * @name: Name of the domain to disconnect cpuidle from. | |
1820 | */ | |
1821 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1822 | { | |
1823 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1824 | } | |
1825 | ||
d23b9b00 RW |
1826 | /* Default device callbacks for generic PM domains. */ |
1827 | ||
ecf00475 RW |
1828 | /** |
1829 | * pm_genpd_default_save_state - Default "save device state" for PM domians. | |
1830 | * @dev: Device to handle. | |
1831 | */ | |
1832 | static int pm_genpd_default_save_state(struct device *dev) | |
1833 | { | |
1834 | int (*cb)(struct device *__dev); | |
ecf00475 | 1835 | |
0b589741 RW |
1836 | if (dev->type && dev->type->pm) |
1837 | cb = dev->type->pm->runtime_suspend; | |
1838 | else if (dev->class && dev->class->pm) | |
1839 | cb = dev->class->pm->runtime_suspend; | |
1840 | else if (dev->bus && dev->bus->pm) | |
1841 | cb = dev->bus->pm->runtime_suspend; | |
1842 | else | |
1843 | cb = NULL; | |
ecf00475 | 1844 | |
0b589741 RW |
1845 | if (!cb && dev->driver && dev->driver->pm) |
1846 | cb = dev->driver->pm->runtime_suspend; | |
1847 | ||
1848 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1849 | } |
1850 | ||
1851 | /** | |
1852 | * pm_genpd_default_restore_state - Default PM domians "restore device state". | |
1853 | * @dev: Device to handle. | |
1854 | */ | |
1855 | static int pm_genpd_default_restore_state(struct device *dev) | |
1856 | { | |
1857 | int (*cb)(struct device *__dev); | |
ecf00475 | 1858 | |
0b589741 RW |
1859 | if (dev->type && dev->type->pm) |
1860 | cb = dev->type->pm->runtime_resume; | |
1861 | else if (dev->class && dev->class->pm) | |
1862 | cb = dev->class->pm->runtime_resume; | |
1863 | else if (dev->bus && dev->bus->pm) | |
1864 | cb = dev->bus->pm->runtime_resume; | |
1865 | else | |
1866 | cb = NULL; | |
ecf00475 | 1867 | |
0b589741 RW |
1868 | if (!cb && dev->driver && dev->driver->pm) |
1869 | cb = dev->driver->pm->runtime_resume; | |
1870 | ||
1871 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1872 | } |
1873 | ||
f721889f RW |
1874 | /** |
1875 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1876 | * @genpd: PM domain object to initialize. | |
1877 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1878 | * @is_off: Initial value of the domain's power_is_off field. | |
1879 | */ | |
1880 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1881 | struct dev_power_governor *gov, bool is_off) | |
1882 | { | |
1883 | if (IS_ERR_OR_NULL(genpd)) | |
1884 | return; | |
1885 | ||
5063ce15 RW |
1886 | INIT_LIST_HEAD(&genpd->master_links); |
1887 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1888 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1889 | mutex_init(&genpd->lock); |
1890 | genpd->gov = gov; | |
1891 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1892 | genpd->in_progress = 0; | |
c4bb3160 | 1893 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1894 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1895 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1896 | genpd->poweroff_task = NULL; |
1897 | genpd->resume_count = 0; | |
596ba34b | 1898 | genpd->device_count = 0; |
221e9b58 | 1899 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1900 | genpd->max_off_time_changed = true; |
f721889f RW |
1901 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1902 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1903 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1904 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1905 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1906 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1907 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1908 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1909 | genpd->domain.ops.resume = pm_genpd_resume; |
1910 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1911 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1912 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1913 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1914 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1915 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1916 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1917 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1918 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1919 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1920 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1921 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1922 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1923 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1924 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
5125bbf3 RW |
1925 | mutex_lock(&gpd_list_lock); |
1926 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1927 | mutex_unlock(&gpd_list_lock); | |
1928 | } |