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Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
f721889f RW |
9 | #include <linux/kernel.h> |
10 | #include <linux/io.h> | |
aa42240a | 11 | #include <linux/platform_device.h> |
f721889f RW |
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); \ | |
d5e4cbfe RW |
29 | } \ |
30 | __ret; \ | |
31 | }) | |
f721889f | 32 | |
0140d8bd RW |
33 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
34 | ({ \ | |
35 | ktime_t __start = ktime_get(); \ | |
36 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
37 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
38 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
39 | if (!__retval && __elapsed > __td->field) { \ | |
40 | __td->field = __elapsed; \ | |
7d1af287 | 41 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 42 | __elapsed); \ |
6ff7bb0d RW |
43 | genpd->max_off_time_changed = true; \ |
44 | __td->constraint_changed = true; \ | |
0140d8bd RW |
45 | } \ |
46 | __retval; \ | |
47 | }) | |
48 | ||
5125bbf3 RW |
49 | static LIST_HEAD(gpd_list); |
50 | static DEFINE_MUTEX(gpd_list_lock); | |
51 | ||
8bc0251d RW |
52 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
53 | { | |
54 | struct generic_pm_domain *genpd = NULL, *gpd; | |
55 | ||
56 | if (IS_ERR_OR_NULL(domain_name)) | |
57 | return NULL; | |
58 | ||
59 | mutex_lock(&gpd_list_lock); | |
60 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
61 | if (!strcmp(gpd->name, domain_name)) { | |
62 | genpd = gpd; | |
63 | break; | |
64 | } | |
65 | } | |
66 | mutex_unlock(&gpd_list_lock); | |
67 | return genpd; | |
68 | } | |
69 | ||
b02c999a | 70 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
71 | { |
72 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
73 | return ERR_PTR(-EINVAL); | |
74 | ||
596ba34b | 75 | return pd_to_genpd(dev->pm_domain); |
5248051b | 76 | } |
f721889f | 77 | |
d5e4cbfe RW |
78 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
79 | { | |
0140d8bd RW |
80 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
81 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
82 | } |
83 | ||
84 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
85 | { | |
0140d8bd RW |
86 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
87 | start_latency_ns, "start"); | |
d5e4cbfe RW |
88 | } |
89 | ||
c4bb3160 | 90 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 91 | { |
c4bb3160 RW |
92 | bool ret = false; |
93 | ||
94 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
95 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
100 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
101 | { | |
102 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 103 | smp_mb__after_atomic(); |
f721889f RW |
104 | } |
105 | ||
17b75eca RW |
106 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
107 | { | |
108 | DEFINE_WAIT(wait); | |
109 | ||
110 | mutex_lock(&genpd->lock); | |
111 | /* | |
112 | * Wait for the domain to transition into either the active, | |
113 | * or the power off state. | |
114 | */ | |
115 | for (;;) { | |
116 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
117 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
118 | if (genpd->status == GPD_STATE_ACTIVE |
119 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
120 | break; |
121 | mutex_unlock(&genpd->lock); | |
122 | ||
123 | schedule(); | |
124 | ||
125 | mutex_lock(&genpd->lock); | |
126 | } | |
127 | finish_wait(&genpd->status_wait_queue, &wait); | |
128 | } | |
129 | ||
130 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
131 | { | |
132 | mutex_unlock(&genpd->lock); | |
133 | } | |
134 | ||
c6d22b37 RW |
135 | static void genpd_set_active(struct generic_pm_domain *genpd) |
136 | { | |
137 | if (genpd->resume_count == 0) | |
138 | genpd->status = GPD_STATE_ACTIVE; | |
139 | } | |
140 | ||
cbc9ef02 RW |
141 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
142 | { | |
143 | s64 usecs64; | |
144 | ||
145 | if (!genpd->cpu_data) | |
146 | return; | |
147 | ||
148 | usecs64 = genpd->power_on_latency_ns; | |
149 | do_div(usecs64, NSEC_PER_USEC); | |
150 | usecs64 += genpd->cpu_data->saved_exit_latency; | |
151 | genpd->cpu_data->idle_state->exit_latency = usecs64; | |
152 | } | |
153 | ||
5248051b | 154 | /** |
5063ce15 | 155 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
156 | * @genpd: PM domain to power up. |
157 | * | |
5063ce15 | 158 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
159 | * resume a device belonging to it. |
160 | */ | |
8951ef02 | 161 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 162 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 163 | { |
5063ce15 | 164 | struct gpd_link *link; |
3f241775 | 165 | DEFINE_WAIT(wait); |
5248051b RW |
166 | int ret = 0; |
167 | ||
5063ce15 | 168 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
169 | for (;;) { |
170 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
171 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 172 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
173 | break; |
174 | mutex_unlock(&genpd->lock); | |
17b75eca | 175 | |
3f241775 RW |
176 | schedule(); |
177 | ||
178 | mutex_lock(&genpd->lock); | |
179 | } | |
180 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 181 | |
17b75eca | 182 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 183 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 184 | return 0; |
5248051b | 185 | |
c6d22b37 RW |
186 | if (genpd->status != GPD_STATE_POWER_OFF) { |
187 | genpd_set_active(genpd); | |
3f241775 | 188 | return 0; |
c6d22b37 RW |
189 | } |
190 | ||
cbc9ef02 RW |
191 | if (genpd->cpu_data) { |
192 | cpuidle_pause_and_lock(); | |
193 | genpd->cpu_data->idle_state->disabled = true; | |
194 | cpuidle_resume_and_unlock(); | |
195 | goto out; | |
196 | } | |
197 | ||
5063ce15 RW |
198 | /* |
199 | * The list is guaranteed not to change while the loop below is being | |
200 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
201 | * with it. | |
202 | */ | |
203 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
204 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 205 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 206 | |
5248051b | 207 | mutex_unlock(&genpd->lock); |
5248051b | 208 | |
5063ce15 | 209 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
210 | |
211 | mutex_lock(&genpd->lock); | |
212 | ||
3f241775 RW |
213 | /* |
214 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 215 | * while the master is powering on. |
3f241775 RW |
216 | */ |
217 | genpd->status = GPD_STATE_POWER_OFF; | |
218 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
219 | if (ret) { |
220 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 221 | goto err; |
5063ce15 | 222 | } |
5248051b RW |
223 | } |
224 | ||
9e08cf42 | 225 | if (genpd->power_on) { |
0140d8bd RW |
226 | ktime_t time_start = ktime_get(); |
227 | s64 elapsed_ns; | |
228 | ||
fe202fde | 229 | ret = genpd->power_on(genpd); |
9e08cf42 RW |
230 | if (ret) |
231 | goto err; | |
0140d8bd RW |
232 | |
233 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 234 | if (elapsed_ns > genpd->power_on_latency_ns) { |
0140d8bd | 235 | genpd->power_on_latency_ns = elapsed_ns; |
6ff7bb0d | 236 | genpd->max_off_time_changed = true; |
cbc9ef02 | 237 | genpd_recalc_cpu_exit_latency(genpd); |
e84b2c20 RW |
238 | if (genpd->name) |
239 | pr_warning("%s: Power-on latency exceeded, " | |
240 | "new value %lld ns\n", genpd->name, | |
241 | elapsed_ns); | |
242 | } | |
3c07cbc4 | 243 | } |
5248051b | 244 | |
cbc9ef02 | 245 | out: |
9e08cf42 RW |
246 | genpd_set_active(genpd); |
247 | ||
3f241775 | 248 | return 0; |
9e08cf42 RW |
249 | |
250 | err: | |
5063ce15 RW |
251 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
252 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 253 | |
3f241775 RW |
254 | return ret; |
255 | } | |
256 | ||
257 | /** | |
5063ce15 | 258 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
259 | * @genpd: PM domain to power up. |
260 | */ | |
261 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
262 | { | |
263 | int ret; | |
264 | ||
265 | mutex_lock(&genpd->lock); | |
266 | ret = __pm_genpd_poweron(genpd); | |
267 | mutex_unlock(&genpd->lock); | |
268 | return ret; | |
5248051b RW |
269 | } |
270 | ||
8bc0251d RW |
271 | /** |
272 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
273 | * @domain_name: Name of the PM domain to power up. | |
274 | */ | |
275 | int pm_genpd_name_poweron(const char *domain_name) | |
276 | { | |
277 | struct generic_pm_domain *genpd; | |
278 | ||
279 | genpd = pm_genpd_lookup_name(domain_name); | |
280 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
281 | } | |
282 | ||
5248051b RW |
283 | #ifdef CONFIG_PM_RUNTIME |
284 | ||
b3d3b9fb SK |
285 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
286 | struct device *dev) | |
287 | { | |
288 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
289 | } | |
290 | ||
8e9afafd RW |
291 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
292 | { | |
293 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
294 | save_state_latency_ns, "state save"); | |
295 | } | |
296 | ||
297 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
298 | { | |
299 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
300 | restore_state_latency_ns, | |
301 | "state restore"); | |
302 | } | |
303 | ||
6ff7bb0d RW |
304 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
305 | unsigned long val, void *ptr) | |
306 | { | |
307 | struct generic_pm_domain_data *gpd_data; | |
308 | struct device *dev; | |
309 | ||
310 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
311 | ||
312 | mutex_lock(&gpd_data->lock); | |
313 | dev = gpd_data->base.dev; | |
314 | if (!dev) { | |
315 | mutex_unlock(&gpd_data->lock); | |
316 | return NOTIFY_DONE; | |
317 | } | |
318 | mutex_unlock(&gpd_data->lock); | |
319 | ||
320 | for (;;) { | |
321 | struct generic_pm_domain *genpd; | |
322 | struct pm_domain_data *pdd; | |
323 | ||
324 | spin_lock_irq(&dev->power.lock); | |
325 | ||
326 | pdd = dev->power.subsys_data ? | |
327 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 328 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
329 | to_gpd_data(pdd)->td.constraint_changed = true; |
330 | genpd = dev_to_genpd(dev); | |
331 | } else { | |
332 | genpd = ERR_PTR(-ENODATA); | |
333 | } | |
334 | ||
335 | spin_unlock_irq(&dev->power.lock); | |
336 | ||
337 | if (!IS_ERR(genpd)) { | |
338 | mutex_lock(&genpd->lock); | |
339 | genpd->max_off_time_changed = true; | |
340 | mutex_unlock(&genpd->lock); | |
341 | } | |
342 | ||
343 | dev = dev->parent; | |
344 | if (!dev || dev->power.ignore_children) | |
345 | break; | |
346 | } | |
347 | ||
348 | return NOTIFY_DONE; | |
349 | } | |
350 | ||
f721889f RW |
351 | /** |
352 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 353 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
354 | * @genpd: PM domain the device belongs to. |
355 | */ | |
4605ab65 | 356 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 357 | struct generic_pm_domain *genpd) |
17b75eca | 358 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 359 | { |
cd0ea672 | 360 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 361 | struct device *dev = pdd->dev; |
f721889f RW |
362 | int ret = 0; |
363 | ||
cd0ea672 | 364 | if (gpd_data->need_restore) |
f721889f RW |
365 | return 0; |
366 | ||
17b75eca RW |
367 | mutex_unlock(&genpd->lock); |
368 | ||
ecf00475 RW |
369 | genpd_start_dev(genpd, dev); |
370 | ret = genpd_save_dev(genpd, dev); | |
371 | genpd_stop_dev(genpd, dev); | |
f721889f | 372 | |
17b75eca RW |
373 | mutex_lock(&genpd->lock); |
374 | ||
f721889f | 375 | if (!ret) |
cd0ea672 | 376 | gpd_data->need_restore = true; |
f721889f RW |
377 | |
378 | return ret; | |
379 | } | |
380 | ||
381 | /** | |
382 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 383 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
384 | * @genpd: PM domain the device belongs to. |
385 | */ | |
4605ab65 | 386 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 387 | struct generic_pm_domain *genpd) |
17b75eca | 388 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 389 | { |
cd0ea672 | 390 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 391 | struct device *dev = pdd->dev; |
80de3d7f | 392 | bool need_restore = gpd_data->need_restore; |
f721889f | 393 | |
80de3d7f | 394 | gpd_data->need_restore = false; |
17b75eca RW |
395 | mutex_unlock(&genpd->lock); |
396 | ||
ecf00475 | 397 | genpd_start_dev(genpd, dev); |
80de3d7f RW |
398 | if (need_restore) |
399 | genpd_restore_dev(genpd, dev); | |
f721889f | 400 | |
17b75eca | 401 | mutex_lock(&genpd->lock); |
f721889f RW |
402 | } |
403 | ||
c6d22b37 RW |
404 | /** |
405 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
406 | * @genpd: PM domain to check. | |
407 | * | |
408 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
409 | * a "power off" operation, which means that a "power on" has occured in the | |
410 | * meantime, or if its resume_count field is different from zero, which means | |
411 | * that one of its devices has been resumed in the meantime. | |
412 | */ | |
413 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
414 | { | |
17877eb5 | 415 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 416 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
417 | } |
418 | ||
56375fd4 RW |
419 | /** |
420 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
421 | * @genpd: PM domait to power off. | |
422 | * | |
423 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
424 | * before. | |
425 | */ | |
d971f0b0 | 426 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 427 | { |
a4ca26a4 | 428 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
429 | } |
430 | ||
f721889f RW |
431 | /** |
432 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
433 | * @genpd: PM domain to power down. | |
434 | * | |
435 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
436 | * have been powered down, run the runtime suspend callbacks provided by all of | |
437 | * the @genpd's devices' drivers and remove power from @genpd. | |
438 | */ | |
439 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 440 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 441 | { |
4605ab65 | 442 | struct pm_domain_data *pdd; |
5063ce15 | 443 | struct gpd_link *link; |
f721889f | 444 | unsigned int not_suspended; |
c6d22b37 | 445 | int ret = 0; |
f721889f | 446 | |
c6d22b37 RW |
447 | start: |
448 | /* | |
449 | * Do not try to power off the domain in the following situations: | |
450 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 451 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 452 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 453 | * (4) System suspend is in progress. |
c6d22b37 | 454 | */ |
3f241775 | 455 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 456 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 457 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
458 | return 0; |
459 | ||
c4bb3160 | 460 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
461 | return -EBUSY; |
462 | ||
463 | not_suspended = 0; | |
34b1f762 RW |
464 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
465 | enum pm_qos_flags_status stat; | |
466 | ||
467 | stat = dev_pm_qos_flags(pdd->dev, | |
468 | PM_QOS_FLAG_NO_POWER_OFF | |
469 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
470 | if (stat > PM_QOS_FLAGS_NONE) | |
471 | return -EBUSY; | |
472 | ||
0aa2a221 | 473 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 474 | || pdd->dev->power.irq_safe)) |
f721889f | 475 | not_suspended++; |
34b1f762 | 476 | } |
f721889f RW |
477 | |
478 | if (not_suspended > genpd->in_progress) | |
479 | return -EBUSY; | |
480 | ||
c6d22b37 RW |
481 | if (genpd->poweroff_task) { |
482 | /* | |
483 | * Another instance of pm_genpd_poweroff() is executing | |
484 | * callbacks, so tell it to start over and return. | |
485 | */ | |
486 | genpd->status = GPD_STATE_REPEAT; | |
487 | return 0; | |
488 | } | |
489 | ||
f721889f RW |
490 | if (genpd->gov && genpd->gov->power_down_ok) { |
491 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
492 | return -EAGAIN; | |
493 | } | |
494 | ||
17b75eca | 495 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 496 | genpd->poweroff_task = current; |
17b75eca | 497 | |
4605ab65 | 498 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 499 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 500 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
501 | |
502 | if (genpd_abort_poweroff(genpd)) | |
503 | goto out; | |
504 | ||
697a7f37 RW |
505 | if (ret) { |
506 | genpd_set_active(genpd); | |
507 | goto out; | |
508 | } | |
f721889f | 509 | |
c6d22b37 RW |
510 | if (genpd->status == GPD_STATE_REPEAT) { |
511 | genpd->poweroff_task = NULL; | |
512 | goto start; | |
513 | } | |
514 | } | |
17b75eca | 515 | |
cbc9ef02 RW |
516 | if (genpd->cpu_data) { |
517 | /* | |
518 | * If cpu_data is set, cpuidle should turn the domain off when | |
519 | * the CPU in it is idle. In that case we don't decrement the | |
520 | * subdomain counts of the master domains, so that power is not | |
521 | * removed from the current domain prematurely as a result of | |
522 | * cutting off the masters' power. | |
523 | */ | |
524 | genpd->status = GPD_STATE_POWER_OFF; | |
525 | cpuidle_pause_and_lock(); | |
526 | genpd->cpu_data->idle_state->disabled = false; | |
527 | cpuidle_resume_and_unlock(); | |
528 | goto out; | |
529 | } | |
530 | ||
3c07cbc4 | 531 | if (genpd->power_off) { |
0140d8bd RW |
532 | ktime_t time_start; |
533 | s64 elapsed_ns; | |
534 | ||
3c07cbc4 RW |
535 | if (atomic_read(&genpd->sd_count) > 0) { |
536 | ret = -EBUSY; | |
c6d22b37 RW |
537 | goto out; |
538 | } | |
17b75eca | 539 | |
0140d8bd RW |
540 | time_start = ktime_get(); |
541 | ||
3c07cbc4 | 542 | /* |
5063ce15 RW |
543 | * If sd_count > 0 at this point, one of the subdomains hasn't |
544 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
545 | * incrementing it. In that case pm_genpd_poweron() will wait |
546 | * for us to drop the lock, so we can call .power_off() and let | |
547 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
548 | * happen very often). | |
549 | */ | |
d2805402 RW |
550 | ret = genpd->power_off(genpd); |
551 | if (ret == -EBUSY) { | |
552 | genpd_set_active(genpd); | |
d2805402 RW |
553 | goto out; |
554 | } | |
0140d8bd RW |
555 | |
556 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
e84b2c20 | 557 | if (elapsed_ns > genpd->power_off_latency_ns) { |
0140d8bd | 558 | genpd->power_off_latency_ns = elapsed_ns; |
6ff7bb0d | 559 | genpd->max_off_time_changed = true; |
e84b2c20 RW |
560 | if (genpd->name) |
561 | pr_warning("%s: Power-off latency exceeded, " | |
562 | "new value %lld ns\n", genpd->name, | |
563 | elapsed_ns); | |
564 | } | |
d2805402 | 565 | } |
f721889f | 566 | |
17b75eca | 567 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 568 | |
5063ce15 RW |
569 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
570 | genpd_sd_counter_dec(link->master); | |
571 | genpd_queue_power_off_work(link->master); | |
572 | } | |
f721889f | 573 | |
c6d22b37 RW |
574 | out: |
575 | genpd->poweroff_task = NULL; | |
576 | wake_up_all(&genpd->status_wait_queue); | |
577 | return ret; | |
f721889f RW |
578 | } |
579 | ||
580 | /** | |
581 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
582 | * @work: Work structure used for scheduling the execution of this function. | |
583 | */ | |
584 | static void genpd_power_off_work_fn(struct work_struct *work) | |
585 | { | |
586 | struct generic_pm_domain *genpd; | |
587 | ||
588 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
589 | ||
17b75eca | 590 | genpd_acquire_lock(genpd); |
f721889f | 591 | pm_genpd_poweroff(genpd); |
17b75eca | 592 | genpd_release_lock(genpd); |
f721889f RW |
593 | } |
594 | ||
595 | /** | |
596 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
597 | * @dev: Device to suspend. | |
598 | * | |
599 | * Carry out a runtime suspend of a device under the assumption that its | |
600 | * pm_domain field points to the domain member of an object of type | |
601 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
602 | */ | |
603 | static int pm_genpd_runtime_suspend(struct device *dev) | |
604 | { | |
605 | struct generic_pm_domain *genpd; | |
b02c999a | 606 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 607 | int ret; |
f721889f RW |
608 | |
609 | dev_dbg(dev, "%s()\n", __func__); | |
610 | ||
5248051b RW |
611 | genpd = dev_to_genpd(dev); |
612 | if (IS_ERR(genpd)) | |
f721889f RW |
613 | return -EINVAL; |
614 | ||
b02c999a RW |
615 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
616 | if (stop_ok && !stop_ok(dev)) | |
617 | return -EBUSY; | |
618 | ||
d5e4cbfe RW |
619 | ret = genpd_stop_dev(genpd, dev); |
620 | if (ret) | |
621 | return ret; | |
17b75eca | 622 | |
0aa2a221 RW |
623 | /* |
624 | * If power.irq_safe is set, this routine will be run with interrupts | |
625 | * off, so it can't use mutexes. | |
626 | */ | |
627 | if (dev->power.irq_safe) | |
628 | return 0; | |
629 | ||
c6d22b37 | 630 | mutex_lock(&genpd->lock); |
f721889f RW |
631 | genpd->in_progress++; |
632 | pm_genpd_poweroff(genpd); | |
633 | genpd->in_progress--; | |
c6d22b37 | 634 | mutex_unlock(&genpd->lock); |
f721889f RW |
635 | |
636 | return 0; | |
637 | } | |
638 | ||
f721889f RW |
639 | /** |
640 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
641 | * @dev: Device to resume. | |
642 | * | |
643 | * Carry out a runtime resume of a device under the assumption that its | |
644 | * pm_domain field points to the domain member of an object of type | |
645 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
646 | */ | |
647 | static int pm_genpd_runtime_resume(struct device *dev) | |
648 | { | |
649 | struct generic_pm_domain *genpd; | |
c6d22b37 | 650 | DEFINE_WAIT(wait); |
f721889f RW |
651 | int ret; |
652 | ||
653 | dev_dbg(dev, "%s()\n", __func__); | |
654 | ||
5248051b RW |
655 | genpd = dev_to_genpd(dev); |
656 | if (IS_ERR(genpd)) | |
f721889f RW |
657 | return -EINVAL; |
658 | ||
0aa2a221 RW |
659 | /* If power.irq_safe, the PM domain is never powered off. */ |
660 | if (dev->power.irq_safe) | |
e2e3e4e5 | 661 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 662 | |
c6d22b37 | 663 | mutex_lock(&genpd->lock); |
3f241775 RW |
664 | ret = __pm_genpd_poweron(genpd); |
665 | if (ret) { | |
666 | mutex_unlock(&genpd->lock); | |
667 | return ret; | |
668 | } | |
17b75eca | 669 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
670 | genpd->resume_count++; |
671 | for (;;) { | |
672 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
673 | TASK_UNINTERRUPTIBLE); | |
674 | /* | |
675 | * If current is the powering off task, we have been called | |
676 | * reentrantly from one of the device callbacks, so we should | |
677 | * not wait. | |
678 | */ | |
679 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
680 | break; | |
681 | mutex_unlock(&genpd->lock); | |
682 | ||
683 | schedule(); | |
684 | ||
685 | mutex_lock(&genpd->lock); | |
686 | } | |
687 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 688 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
689 | genpd->resume_count--; |
690 | genpd_set_active(genpd); | |
17b75eca | 691 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 692 | mutex_unlock(&genpd->lock); |
17b75eca | 693 | |
f721889f RW |
694 | return 0; |
695 | } | |
696 | ||
39ac5ba5 TB |
697 | static bool pd_ignore_unused; |
698 | static int __init pd_ignore_unused_setup(char *__unused) | |
699 | { | |
700 | pd_ignore_unused = true; | |
701 | return 1; | |
702 | } | |
703 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
704 | ||
17f2ae7f RW |
705 | /** |
706 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
707 | */ | |
708 | void pm_genpd_poweroff_unused(void) | |
709 | { | |
710 | struct generic_pm_domain *genpd; | |
711 | ||
39ac5ba5 TB |
712 | if (pd_ignore_unused) { |
713 | pr_warn("genpd: Not disabling unused power domains\n"); | |
714 | return; | |
715 | } | |
716 | ||
17f2ae7f RW |
717 | mutex_lock(&gpd_list_lock); |
718 | ||
719 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
720 | genpd_queue_power_off_work(genpd); | |
721 | ||
722 | mutex_unlock(&gpd_list_lock); | |
723 | } | |
724 | ||
2fe71dcd UH |
725 | static int __init genpd_poweroff_unused(void) |
726 | { | |
727 | pm_genpd_poweroff_unused(); | |
728 | return 0; | |
729 | } | |
730 | late_initcall(genpd_poweroff_unused); | |
731 | ||
f721889f RW |
732 | #else |
733 | ||
6ff7bb0d RW |
734 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
735 | unsigned long val, void *ptr) | |
736 | { | |
737 | return NOTIFY_DONE; | |
738 | } | |
739 | ||
d971f0b0 UH |
740 | static inline void |
741 | genpd_queue_power_off_work(struct generic_pm_domain *genpd) {} | |
742 | ||
f721889f RW |
743 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
744 | ||
745 | #define pm_genpd_runtime_suspend NULL | |
746 | #define pm_genpd_runtime_resume NULL | |
747 | ||
748 | #endif /* CONFIG_PM_RUNTIME */ | |
749 | ||
596ba34b RW |
750 | #ifdef CONFIG_PM_SLEEP |
751 | ||
77f827de RW |
752 | /** |
753 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
754 | * @genpd: PM domain to check. | |
755 | */ | |
756 | static bool pm_genpd_present(struct generic_pm_domain *genpd) | |
757 | { | |
758 | struct generic_pm_domain *gpd; | |
759 | ||
760 | if (IS_ERR_OR_NULL(genpd)) | |
761 | return false; | |
762 | ||
763 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
764 | if (gpd == genpd) | |
765 | return true; | |
766 | ||
767 | return false; | |
768 | } | |
769 | ||
d5e4cbfe RW |
770 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
771 | struct device *dev) | |
772 | { | |
773 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
774 | } | |
775 | ||
596ba34b | 776 | /** |
5063ce15 | 777 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
778 | * @genpd: PM domain to power off, if possible. |
779 | * | |
780 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 781 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 782 | * |
77f827de RW |
783 | * This function is only called in "noirq" and "syscore" stages of system power |
784 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
785 | * executed sequentially, so it is guaranteed that it will never run twice in | |
786 | * parallel). | |
596ba34b RW |
787 | */ |
788 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
789 | { | |
5063ce15 | 790 | struct gpd_link *link; |
596ba34b | 791 | |
17b75eca | 792 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
793 | return; |
794 | ||
c4bb3160 RW |
795 | if (genpd->suspended_count != genpd->device_count |
796 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
797 | return; |
798 | ||
799 | if (genpd->power_off) | |
800 | genpd->power_off(genpd); | |
801 | ||
17b75eca | 802 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
803 | |
804 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
805 | genpd_sd_counter_dec(link->master); | |
806 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
807 | } |
808 | } | |
809 | ||
802d8b49 RW |
810 | /** |
811 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
812 | * @genpd: PM domain to power on. | |
813 | * | |
77f827de RW |
814 | * This function is only called in "noirq" and "syscore" stages of system power |
815 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
816 | * executed sequentially, so it is guaranteed that it will never run twice in | |
817 | * parallel). | |
802d8b49 RW |
818 | */ |
819 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
820 | { | |
821 | struct gpd_link *link; | |
822 | ||
823 | if (genpd->status != GPD_STATE_POWER_OFF) | |
824 | return; | |
825 | ||
826 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
827 | pm_genpd_sync_poweron(link->master); | |
828 | genpd_sd_counter_inc(link->master); | |
829 | } | |
830 | ||
831 | if (genpd->power_on) | |
832 | genpd->power_on(genpd); | |
833 | ||
834 | genpd->status = GPD_STATE_ACTIVE; | |
835 | } | |
836 | ||
4ecd6e65 RW |
837 | /** |
838 | * resume_needed - Check whether to resume a device before system suspend. | |
839 | * @dev: Device to check. | |
840 | * @genpd: PM domain the device belongs to. | |
841 | * | |
842 | * There are two cases in which a device that can wake up the system from sleep | |
843 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
844 | * to wake up the system and it has to remain active for this purpose while the | |
845 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
846 | * the system from sleep states and it generally doesn't generate wakeup signals | |
847 | * by itself (those signals are generated on its behalf by other parts of the | |
848 | * system). In the latter case it may be necessary to reconfigure the device's | |
849 | * wakeup settings during system suspend, because it may have been set up to | |
850 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
851 | * Return 'true' in either of the above cases. | |
852 | */ | |
853 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
854 | { | |
855 | bool active_wakeup; | |
856 | ||
857 | if (!device_can_wakeup(dev)) | |
858 | return false; | |
859 | ||
d5e4cbfe | 860 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
861 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
862 | } | |
863 | ||
596ba34b RW |
864 | /** |
865 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
866 | * @dev: Device to start the transition of. | |
867 | * | |
868 | * Start a power transition of a device (during a system-wide power transition) | |
869 | * under the assumption that its pm_domain field points to the domain member of | |
870 | * an object of type struct generic_pm_domain representing a PM domain | |
871 | * consisting of I/O devices. | |
872 | */ | |
873 | static int pm_genpd_prepare(struct device *dev) | |
874 | { | |
875 | struct generic_pm_domain *genpd; | |
b6c10c84 | 876 | int ret; |
596ba34b RW |
877 | |
878 | dev_dbg(dev, "%s()\n", __func__); | |
879 | ||
880 | genpd = dev_to_genpd(dev); | |
881 | if (IS_ERR(genpd)) | |
882 | return -EINVAL; | |
883 | ||
17b75eca RW |
884 | /* |
885 | * If a wakeup request is pending for the device, it should be woken up | |
886 | * at this point and a system wakeup event should be reported if it's | |
887 | * set up to wake up the system from sleep states. | |
888 | */ | |
889 | pm_runtime_get_noresume(dev); | |
890 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
891 | pm_wakeup_event(dev, 0); | |
892 | ||
893 | if (pm_wakeup_pending()) { | |
84167035 | 894 | pm_runtime_put(dev); |
17b75eca RW |
895 | return -EBUSY; |
896 | } | |
897 | ||
4ecd6e65 RW |
898 | if (resume_needed(dev, genpd)) |
899 | pm_runtime_resume(dev); | |
900 | ||
17b75eca | 901 | genpd_acquire_lock(genpd); |
596ba34b | 902 | |
65533bbf RW |
903 | if (genpd->prepared_count++ == 0) { |
904 | genpd->suspended_count = 0; | |
17b75eca | 905 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 906 | } |
17b75eca RW |
907 | |
908 | genpd_release_lock(genpd); | |
596ba34b RW |
909 | |
910 | if (genpd->suspend_power_off) { | |
17b75eca | 911 | pm_runtime_put_noidle(dev); |
596ba34b RW |
912 | return 0; |
913 | } | |
914 | ||
915 | /* | |
17b75eca RW |
916 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
917 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 918 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 919 | * to make it operational. |
596ba34b | 920 | */ |
17b75eca | 921 | pm_runtime_resume(dev); |
596ba34b RW |
922 | __pm_runtime_disable(dev, false); |
923 | ||
b6c10c84 RW |
924 | ret = pm_generic_prepare(dev); |
925 | if (ret) { | |
926 | mutex_lock(&genpd->lock); | |
927 | ||
928 | if (--genpd->prepared_count == 0) | |
929 | genpd->suspend_power_off = false; | |
930 | ||
931 | mutex_unlock(&genpd->lock); | |
17b75eca | 932 | pm_runtime_enable(dev); |
b6c10c84 | 933 | } |
17b75eca | 934 | |
84167035 | 935 | pm_runtime_put(dev); |
b6c10c84 | 936 | return ret; |
596ba34b RW |
937 | } |
938 | ||
939 | /** | |
940 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
941 | * @dev: Device to suspend. | |
942 | * | |
943 | * Suspend a device under the assumption that its pm_domain field points to the | |
944 | * domain member of an object of type struct generic_pm_domain representing | |
945 | * a PM domain consisting of I/O devices. | |
946 | */ | |
947 | static int pm_genpd_suspend(struct device *dev) | |
948 | { | |
949 | struct generic_pm_domain *genpd; | |
950 | ||
951 | dev_dbg(dev, "%s()\n", __func__); | |
952 | ||
953 | genpd = dev_to_genpd(dev); | |
954 | if (IS_ERR(genpd)) | |
955 | return -EINVAL; | |
956 | ||
1e0407ca | 957 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
958 | } |
959 | ||
960 | /** | |
0496c8ae | 961 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
962 | * @dev: Device to suspend. |
963 | * | |
964 | * Carry out a late suspend of a device under the assumption that its | |
965 | * pm_domain field points to the domain member of an object of type | |
966 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
967 | */ | |
0496c8ae | 968 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
969 | { |
970 | struct generic_pm_domain *genpd; | |
596ba34b RW |
971 | |
972 | dev_dbg(dev, "%s()\n", __func__); | |
973 | ||
974 | genpd = dev_to_genpd(dev); | |
975 | if (IS_ERR(genpd)) | |
976 | return -EINVAL; | |
977 | ||
1e0407ca | 978 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 979 | } |
596ba34b | 980 | |
0496c8ae RW |
981 | /** |
982 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
983 | * @dev: Device to suspend. | |
984 | * | |
985 | * Stop the device and remove power from the domain if all devices in it have | |
986 | * been stopped. | |
987 | */ | |
988 | static int pm_genpd_suspend_noirq(struct device *dev) | |
989 | { | |
990 | struct generic_pm_domain *genpd; | |
991 | ||
992 | dev_dbg(dev, "%s()\n", __func__); | |
993 | ||
994 | genpd = dev_to_genpd(dev); | |
995 | if (IS_ERR(genpd)) | |
996 | return -EINVAL; | |
596ba34b | 997 | |
dbf37414 | 998 | if (genpd->suspend_power_off |
0496c8ae | 999 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1000 | return 0; |
1001 | ||
d5e4cbfe | 1002 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1003 | |
1004 | /* | |
1005 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1006 | * guaranteed that this function will never run twice in parallel for | |
1007 | * the same PM domain, so it is not necessary to use locking here. | |
1008 | */ | |
1009 | genpd->suspended_count++; | |
1010 | pm_genpd_sync_poweroff(genpd); | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | /** | |
0496c8ae | 1016 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1017 | * @dev: Device to resume. |
1018 | * | |
0496c8ae | 1019 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1020 | */ |
1021 | static int pm_genpd_resume_noirq(struct device *dev) | |
1022 | { | |
1023 | struct generic_pm_domain *genpd; | |
1024 | ||
1025 | dev_dbg(dev, "%s()\n", __func__); | |
1026 | ||
1027 | genpd = dev_to_genpd(dev); | |
1028 | if (IS_ERR(genpd)) | |
1029 | return -EINVAL; | |
1030 | ||
dbf37414 | 1031 | if (genpd->suspend_power_off |
cc85b207 | 1032 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1033 | return 0; |
1034 | ||
1035 | /* | |
1036 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1037 | * guaranteed that this function will never run twice in parallel for | |
1038 | * the same PM domain, so it is not necessary to use locking here. | |
1039 | */ | |
802d8b49 | 1040 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1041 | genpd->suspended_count--; |
596ba34b | 1042 | |
0496c8ae | 1043 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1044 | } |
1045 | ||
1046 | /** | |
0496c8ae RW |
1047 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1048 | * @dev: Device to resume. | |
1049 | * | |
1050 | * Carry out an early resume of a device under the assumption that its | |
1051 | * pm_domain field points to the domain member of an object of type | |
1052 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1053 | * devices. | |
1054 | */ | |
1055 | static int pm_genpd_resume_early(struct device *dev) | |
1056 | { | |
1057 | struct generic_pm_domain *genpd; | |
1058 | ||
1059 | dev_dbg(dev, "%s()\n", __func__); | |
1060 | ||
1061 | genpd = dev_to_genpd(dev); | |
1062 | if (IS_ERR(genpd)) | |
1063 | return -EINVAL; | |
1064 | ||
1e0407ca | 1065 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1066 | } |
1067 | ||
1068 | /** | |
1069 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1070 | * @dev: Device to resume. |
1071 | * | |
1072 | * Resume a device under the assumption that its pm_domain field points to the | |
1073 | * domain member of an object of type struct generic_pm_domain representing | |
1074 | * a power domain consisting of I/O devices. | |
1075 | */ | |
1076 | static int pm_genpd_resume(struct device *dev) | |
1077 | { | |
1078 | struct generic_pm_domain *genpd; | |
1079 | ||
1080 | dev_dbg(dev, "%s()\n", __func__); | |
1081 | ||
1082 | genpd = dev_to_genpd(dev); | |
1083 | if (IS_ERR(genpd)) | |
1084 | return -EINVAL; | |
1085 | ||
1e0407ca | 1086 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1087 | } |
1088 | ||
1089 | /** | |
0496c8ae | 1090 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1091 | * @dev: Device to freeze. |
1092 | * | |
1093 | * Freeze a device under the assumption that its pm_domain field points to the | |
1094 | * domain member of an object of type struct generic_pm_domain representing | |
1095 | * a power domain consisting of I/O devices. | |
1096 | */ | |
1097 | static int pm_genpd_freeze(struct device *dev) | |
1098 | { | |
1099 | struct generic_pm_domain *genpd; | |
1100 | ||
1101 | dev_dbg(dev, "%s()\n", __func__); | |
1102 | ||
1103 | genpd = dev_to_genpd(dev); | |
1104 | if (IS_ERR(genpd)) | |
1105 | return -EINVAL; | |
1106 | ||
1e0407ca | 1107 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1108 | } |
1109 | ||
1110 | /** | |
0496c8ae RW |
1111 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1112 | * @dev: Device to freeze. | |
1113 | * | |
1114 | * Carry out a late freeze of a device under the assumption that its | |
1115 | * pm_domain field points to the domain member of an object of type | |
1116 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1117 | * devices. | |
1118 | */ | |
1119 | static int pm_genpd_freeze_late(struct device *dev) | |
1120 | { | |
1121 | struct generic_pm_domain *genpd; | |
1122 | ||
1123 | dev_dbg(dev, "%s()\n", __func__); | |
1124 | ||
1125 | genpd = dev_to_genpd(dev); | |
1126 | if (IS_ERR(genpd)) | |
1127 | return -EINVAL; | |
1128 | ||
1e0407ca | 1129 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
1130 | } |
1131 | ||
1132 | /** | |
1133 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1134 | * @dev: Device to freeze. |
1135 | * | |
1136 | * Carry out a late freeze of a device under the assumption that its | |
1137 | * pm_domain field points to the domain member of an object of type | |
1138 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1139 | * devices. | |
1140 | */ | |
1141 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1142 | { | |
1143 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1144 | |
1145 | dev_dbg(dev, "%s()\n", __func__); | |
1146 | ||
1147 | genpd = dev_to_genpd(dev); | |
1148 | if (IS_ERR(genpd)) | |
1149 | return -EINVAL; | |
1150 | ||
dbf37414 | 1151 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1152 | } |
596ba34b | 1153 | |
0496c8ae RW |
1154 | /** |
1155 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1156 | * @dev: Device to thaw. | |
1157 | * | |
1158 | * Start the device, unless power has been removed from the domain already | |
1159 | * before the system transition. | |
1160 | */ | |
1161 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1162 | { | |
1163 | struct generic_pm_domain *genpd; | |
596ba34b | 1164 | |
0496c8ae | 1165 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1166 | |
0496c8ae RW |
1167 | genpd = dev_to_genpd(dev); |
1168 | if (IS_ERR(genpd)) | |
1169 | return -EINVAL; | |
1170 | ||
dbf37414 | 1171 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1172 | } |
1173 | ||
1174 | /** | |
0496c8ae | 1175 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1176 | * @dev: Device to thaw. |
1177 | * | |
1178 | * Carry out an early thaw of a device under the assumption that its | |
1179 | * pm_domain field points to the domain member of an object of type | |
1180 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1181 | * devices. | |
1182 | */ | |
0496c8ae | 1183 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1184 | { |
1185 | struct generic_pm_domain *genpd; | |
1186 | ||
1187 | dev_dbg(dev, "%s()\n", __func__); | |
1188 | ||
1189 | genpd = dev_to_genpd(dev); | |
1190 | if (IS_ERR(genpd)) | |
1191 | return -EINVAL; | |
1192 | ||
1e0407ca | 1193 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1194 | } |
1195 | ||
1196 | /** | |
1197 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1198 | * @dev: Device to thaw. | |
1199 | * | |
1200 | * Thaw a device under the assumption that its pm_domain field points to the | |
1201 | * domain member of an object of type struct generic_pm_domain representing | |
1202 | * a power domain consisting of I/O devices. | |
1203 | */ | |
1204 | static int pm_genpd_thaw(struct device *dev) | |
1205 | { | |
1206 | struct generic_pm_domain *genpd; | |
1207 | ||
1208 | dev_dbg(dev, "%s()\n", __func__); | |
1209 | ||
1210 | genpd = dev_to_genpd(dev); | |
1211 | if (IS_ERR(genpd)) | |
1212 | return -EINVAL; | |
1213 | ||
1e0407ca | 1214 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1215 | } |
1216 | ||
1217 | /** | |
0496c8ae | 1218 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1219 | * @dev: Device to resume. |
1220 | * | |
0496c8ae RW |
1221 | * Make sure the domain will be in the same power state as before the |
1222 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1223 | */ |
1224 | static int pm_genpd_restore_noirq(struct device *dev) | |
1225 | { | |
1226 | struct generic_pm_domain *genpd; | |
1227 | ||
1228 | dev_dbg(dev, "%s()\n", __func__); | |
1229 | ||
1230 | genpd = dev_to_genpd(dev); | |
1231 | if (IS_ERR(genpd)) | |
1232 | return -EINVAL; | |
1233 | ||
1234 | /* | |
1235 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1236 | * guaranteed that this function will never run twice in parallel for | |
1237 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1238 | * |
1239 | * At this point suspended_count == 0 means we are being run for the | |
1240 | * first time for the given domain in the present cycle. | |
596ba34b | 1241 | */ |
65533bbf | 1242 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1243 | /* |
65533bbf | 1244 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1245 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1246 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1247 | */ |
65533bbf RW |
1248 | genpd->status = GPD_STATE_POWER_OFF; |
1249 | if (genpd->suspend_power_off) { | |
1250 | /* | |
1251 | * If the domain was off before the hibernation, make | |
1252 | * sure it will be off going forward. | |
1253 | */ | |
1254 | if (genpd->power_off) | |
1255 | genpd->power_off(genpd); | |
1256 | ||
1257 | return 0; | |
1258 | } | |
596ba34b RW |
1259 | } |
1260 | ||
18dd2ece RW |
1261 | if (genpd->suspend_power_off) |
1262 | return 0; | |
1263 | ||
802d8b49 | 1264 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1265 | |
dbf37414 | 1266 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1267 | } |
1268 | ||
1269 | /** | |
1270 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1271 | * @dev: Device to complete the transition of. | |
1272 | * | |
1273 | * Complete a power transition of a device (during a system-wide power | |
1274 | * transition) under the assumption that its pm_domain field points to the | |
1275 | * domain member of an object of type struct generic_pm_domain representing | |
1276 | * a power domain consisting of I/O devices. | |
1277 | */ | |
1278 | static void pm_genpd_complete(struct device *dev) | |
1279 | { | |
1280 | struct generic_pm_domain *genpd; | |
1281 | bool run_complete; | |
1282 | ||
1283 | dev_dbg(dev, "%s()\n", __func__); | |
1284 | ||
1285 | genpd = dev_to_genpd(dev); | |
1286 | if (IS_ERR(genpd)) | |
1287 | return; | |
1288 | ||
1289 | mutex_lock(&genpd->lock); | |
1290 | ||
1291 | run_complete = !genpd->suspend_power_off; | |
1292 | if (--genpd->prepared_count == 0) | |
1293 | genpd->suspend_power_off = false; | |
1294 | ||
1295 | mutex_unlock(&genpd->lock); | |
1296 | ||
1297 | if (run_complete) { | |
1298 | pm_generic_complete(dev); | |
6f00ff78 | 1299 | pm_runtime_set_active(dev); |
596ba34b | 1300 | pm_runtime_enable(dev); |
af939339 | 1301 | pm_request_idle(dev); |
596ba34b RW |
1302 | } |
1303 | } | |
1304 | ||
77f827de | 1305 | /** |
d47e6464 | 1306 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1307 | * @dev: Device that normally is marked as "always on" to switch power for. |
1308 | * | |
1309 | * This routine may only be called during the system core (syscore) suspend or | |
1310 | * resume phase for devices whose "always on" flags are set. | |
1311 | */ | |
d47e6464 | 1312 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1313 | { |
1314 | struct generic_pm_domain *genpd; | |
1315 | ||
1316 | genpd = dev_to_genpd(dev); | |
1317 | if (!pm_genpd_present(genpd)) | |
1318 | return; | |
1319 | ||
1320 | if (suspend) { | |
1321 | genpd->suspended_count++; | |
1322 | pm_genpd_sync_poweroff(genpd); | |
1323 | } else { | |
1324 | pm_genpd_sync_poweron(genpd); | |
1325 | genpd->suspended_count--; | |
1326 | } | |
1327 | } | |
d47e6464 UH |
1328 | |
1329 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1330 | { | |
1331 | genpd_syscore_switch(dev, true); | |
1332 | } | |
1333 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1334 | ||
1335 | void pm_genpd_syscore_poweron(struct device *dev) | |
1336 | { | |
1337 | genpd_syscore_switch(dev, false); | |
1338 | } | |
1339 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1340 | |
596ba34b RW |
1341 | #else |
1342 | ||
1343 | #define pm_genpd_prepare NULL | |
1344 | #define pm_genpd_suspend NULL | |
0496c8ae | 1345 | #define pm_genpd_suspend_late NULL |
596ba34b | 1346 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1347 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1348 | #define pm_genpd_resume_noirq NULL |
1349 | #define pm_genpd_resume NULL | |
1350 | #define pm_genpd_freeze NULL | |
0496c8ae | 1351 | #define pm_genpd_freeze_late NULL |
596ba34b | 1352 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1353 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1354 | #define pm_genpd_thaw_noirq NULL |
1355 | #define pm_genpd_thaw NULL | |
596ba34b | 1356 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1357 | #define pm_genpd_complete NULL |
1358 | ||
1359 | #endif /* CONFIG_PM_SLEEP */ | |
1360 | ||
1d5fcfec RW |
1361 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1362 | { | |
1363 | struct generic_pm_domain_data *gpd_data; | |
1364 | ||
1365 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1366 | if (!gpd_data) | |
1367 | return NULL; | |
1368 | ||
1369 | mutex_init(&gpd_data->lock); | |
1370 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1371 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1372 | return gpd_data; | |
1373 | } | |
1374 | ||
1375 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1376 | struct generic_pm_domain_data *gpd_data) | |
1377 | { | |
1378 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1379 | kfree(gpd_data); | |
1380 | } | |
1381 | ||
f721889f | 1382 | /** |
b02c999a | 1383 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1384 | * @genpd: PM domain to add the device to. |
1385 | * @dev: Device to be added. | |
b02c999a | 1386 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1387 | */ |
b02c999a RW |
1388 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1389 | struct gpd_timing_data *td) | |
f721889f | 1390 | { |
1d5fcfec | 1391 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1392 | struct pm_domain_data *pdd; |
f721889f RW |
1393 | int ret = 0; |
1394 | ||
1395 | dev_dbg(dev, "%s()\n", __func__); | |
1396 | ||
1397 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1398 | return -EINVAL; | |
1399 | ||
1d5fcfec RW |
1400 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1401 | if (!gpd_data_new) | |
6ff7bb0d RW |
1402 | return -ENOMEM; |
1403 | ||
17b75eca | 1404 | genpd_acquire_lock(genpd); |
f721889f | 1405 | |
596ba34b RW |
1406 | if (genpd->prepared_count > 0) { |
1407 | ret = -EAGAIN; | |
1408 | goto out; | |
1409 | } | |
1410 | ||
4605ab65 RW |
1411 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1412 | if (pdd->dev == dev) { | |
f721889f RW |
1413 | ret = -EINVAL; |
1414 | goto out; | |
1415 | } | |
1416 | ||
1d5fcfec RW |
1417 | ret = dev_pm_get_subsys_data(dev); |
1418 | if (ret) | |
1419 | goto out; | |
1420 | ||
596ba34b | 1421 | genpd->device_count++; |
6ff7bb0d | 1422 | genpd->max_off_time_changed = true; |
f721889f | 1423 | |
6ff7bb0d | 1424 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1425 | |
6ff7bb0d | 1426 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1427 | if (dev->power.subsys_data->domain_data) { |
1428 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1429 | } else { | |
1430 | gpd_data = gpd_data_new; | |
1431 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1432 | } | |
1433 | gpd_data->refcount++; | |
b02c999a RW |
1434 | if (td) |
1435 | gpd_data->td = *td; | |
f721889f | 1436 | |
1d5fcfec RW |
1437 | spin_unlock_irq(&dev->power.lock); |
1438 | ||
1439 | mutex_lock(&gpd_data->lock); | |
1440 | gpd_data->base.dev = dev; | |
1441 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
1442 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; | |
6ff7bb0d RW |
1443 | gpd_data->td.constraint_changed = true; |
1444 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1445 | mutex_unlock(&gpd_data->lock); |
1446 | ||
f721889f | 1447 | out: |
17b75eca | 1448 | genpd_release_lock(genpd); |
f721889f | 1449 | |
1d5fcfec RW |
1450 | if (gpd_data != gpd_data_new) |
1451 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1452 | ||
f721889f RW |
1453 | return ret; |
1454 | } | |
1455 | ||
c8aa130b TA |
1456 | /** |
1457 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. | |
1458 | * @genpd_node: Device tree node pointer representing a PM domain to which the | |
1459 | * the device is added to. | |
1460 | * @dev: Device to be added. | |
1461 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1462 | */ | |
1463 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, | |
1464 | struct gpd_timing_data *td) | |
1465 | { | |
1466 | struct generic_pm_domain *genpd = NULL, *gpd; | |
1467 | ||
1468 | dev_dbg(dev, "%s()\n", __func__); | |
1469 | ||
1470 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) | |
1471 | return -EINVAL; | |
1472 | ||
1473 | mutex_lock(&gpd_list_lock); | |
1474 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1475 | if (gpd->of_node == genpd_node) { | |
1476 | genpd = gpd; | |
1477 | break; | |
1478 | } | |
1479 | } | |
1480 | mutex_unlock(&gpd_list_lock); | |
1481 | ||
1482 | if (!genpd) | |
1483 | return -EINVAL; | |
1484 | ||
1485 | return __pm_genpd_add_device(genpd, dev, td); | |
1486 | } | |
1487 | ||
b5abb085 RW |
1488 | |
1489 | /** | |
1490 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1491 | * @domain_name: Name of the PM domain to add the device to. | |
1492 | * @dev: Device to be added. | |
1493 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1494 | */ | |
1495 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1496 | struct gpd_timing_data *td) | |
1497 | { | |
8bc0251d | 1498 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1499 | } |
1500 | ||
f721889f RW |
1501 | /** |
1502 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1503 | * @genpd: PM domain to remove the device from. | |
1504 | * @dev: Device to be removed. | |
1505 | */ | |
1506 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1507 | struct device *dev) | |
1508 | { | |
6ff7bb0d | 1509 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1510 | struct pm_domain_data *pdd; |
1d5fcfec | 1511 | bool remove = false; |
efa69025 | 1512 | int ret = 0; |
f721889f RW |
1513 | |
1514 | dev_dbg(dev, "%s()\n", __func__); | |
1515 | ||
efa69025 RW |
1516 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1517 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1518 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1519 | return -EINVAL; |
1520 | ||
17b75eca | 1521 | genpd_acquire_lock(genpd); |
f721889f | 1522 | |
596ba34b RW |
1523 | if (genpd->prepared_count > 0) { |
1524 | ret = -EAGAIN; | |
1525 | goto out; | |
1526 | } | |
1527 | ||
6ff7bb0d RW |
1528 | genpd->device_count--; |
1529 | genpd->max_off_time_changed = true; | |
1530 | ||
1531 | spin_lock_irq(&dev->power.lock); | |
1d5fcfec | 1532 | |
efa69025 RW |
1533 | dev->pm_domain = NULL; |
1534 | pdd = dev->power.subsys_data->domain_data; | |
1535 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1536 | gpd_data = to_gpd_data(pdd); |
1537 | if (--gpd_data->refcount == 0) { | |
1538 | dev->power.subsys_data->domain_data = NULL; | |
1539 | remove = true; | |
1540 | } | |
1541 | ||
6ff7bb0d | 1542 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1543 | |
6ff7bb0d RW |
1544 | mutex_lock(&gpd_data->lock); |
1545 | pdd->dev = NULL; | |
1546 | mutex_unlock(&gpd_data->lock); | |
1547 | ||
1548 | genpd_release_lock(genpd); | |
1549 | ||
6ff7bb0d | 1550 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1551 | if (remove) |
1552 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1553 | ||
6ff7bb0d | 1554 | return 0; |
f721889f | 1555 | |
596ba34b | 1556 | out: |
17b75eca | 1557 | genpd_release_lock(genpd); |
f721889f RW |
1558 | |
1559 | return ret; | |
1560 | } | |
1561 | ||
ca1d72f0 RW |
1562 | /** |
1563 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1564 | * @dev: Device to set/unset the flag for. | |
1565 | * @val: The new value of the device's "need restore" flag. | |
1566 | */ | |
1567 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1568 | { | |
1569 | struct pm_subsys_data *psd; | |
1570 | unsigned long flags; | |
1571 | ||
1572 | spin_lock_irqsave(&dev->power.lock, flags); | |
1573 | ||
1574 | psd = dev_to_psd(dev); | |
1575 | if (psd && psd->domain_data) | |
1576 | to_gpd_data(psd->domain_data)->need_restore = val; | |
1577 | ||
1578 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1579 | } | |
1580 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1581 | ||
f721889f RW |
1582 | /** |
1583 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1584 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1585 | * @subdomain: Subdomain to be added. |
f721889f RW |
1586 | */ |
1587 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1588 | struct generic_pm_domain *subdomain) |
f721889f | 1589 | { |
5063ce15 | 1590 | struct gpd_link *link; |
f721889f RW |
1591 | int ret = 0; |
1592 | ||
fb7268be RW |
1593 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1594 | || genpd == subdomain) | |
f721889f RW |
1595 | return -EINVAL; |
1596 | ||
17b75eca RW |
1597 | start: |
1598 | genpd_acquire_lock(genpd); | |
bc0403ff | 1599 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1600 | |
bc0403ff RW |
1601 | if (subdomain->status != GPD_STATE_POWER_OFF |
1602 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1603 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1604 | genpd_release_lock(genpd); |
1605 | goto start; | |
1606 | } | |
1607 | ||
1608 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1609 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1610 | ret = -EINVAL; |
1611 | goto out; | |
1612 | } | |
1613 | ||
4fcac10d | 1614 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1615 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1616 | ret = -EINVAL; |
1617 | goto out; | |
1618 | } | |
1619 | } | |
1620 | ||
5063ce15 RW |
1621 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1622 | if (!link) { | |
1623 | ret = -ENOMEM; | |
1624 | goto out; | |
1625 | } | |
1626 | link->master = genpd; | |
1627 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1628 | link->slave = subdomain; |
1629 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1630 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1631 | genpd_sd_counter_inc(genpd); |
f721889f | 1632 | |
f721889f | 1633 | out: |
bc0403ff | 1634 | mutex_unlock(&subdomain->lock); |
17b75eca | 1635 | genpd_release_lock(genpd); |
f721889f RW |
1636 | |
1637 | return ret; | |
1638 | } | |
1639 | ||
fb7268be RW |
1640 | /** |
1641 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1642 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1643 | * @subdomain_name: Name of the subdomain to be added. | |
1644 | */ | |
1645 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1646 | const char *subdomain_name) | |
1647 | { | |
1648 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1649 | ||
1650 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1651 | return -EINVAL; | |
1652 | ||
1653 | mutex_lock(&gpd_list_lock); | |
1654 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1655 | if (!master && !strcmp(gpd->name, master_name)) | |
1656 | master = gpd; | |
1657 | ||
1658 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1659 | subdomain = gpd; | |
1660 | ||
1661 | if (master && subdomain) | |
1662 | break; | |
1663 | } | |
1664 | mutex_unlock(&gpd_list_lock); | |
1665 | ||
1666 | return pm_genpd_add_subdomain(master, subdomain); | |
1667 | } | |
1668 | ||
f721889f RW |
1669 | /** |
1670 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1671 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1672 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1673 | */ |
1674 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1675 | struct generic_pm_domain *subdomain) |
f721889f | 1676 | { |
5063ce15 | 1677 | struct gpd_link *link; |
f721889f RW |
1678 | int ret = -EINVAL; |
1679 | ||
5063ce15 | 1680 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1681 | return -EINVAL; |
1682 | ||
17b75eca RW |
1683 | start: |
1684 | genpd_acquire_lock(genpd); | |
f721889f | 1685 | |
5063ce15 RW |
1686 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1687 | if (link->slave != subdomain) | |
f721889f RW |
1688 | continue; |
1689 | ||
1690 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1691 | ||
17b75eca RW |
1692 | if (subdomain->status != GPD_STATE_POWER_OFF |
1693 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1694 | mutex_unlock(&subdomain->lock); | |
1695 | genpd_release_lock(genpd); | |
1696 | goto start; | |
1697 | } | |
1698 | ||
5063ce15 RW |
1699 | list_del(&link->master_node); |
1700 | list_del(&link->slave_node); | |
1701 | kfree(link); | |
17b75eca | 1702 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1703 | genpd_sd_counter_dec(genpd); |
1704 | ||
1705 | mutex_unlock(&subdomain->lock); | |
1706 | ||
1707 | ret = 0; | |
1708 | break; | |
1709 | } | |
1710 | ||
17b75eca | 1711 | genpd_release_lock(genpd); |
f721889f RW |
1712 | |
1713 | return ret; | |
1714 | } | |
1715 | ||
40114447 RW |
1716 | /** |
1717 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1718 | * @genpd: PM domain to be connected with cpuidle. | |
1719 | * @state: cpuidle state this domain can disable/enable. | |
1720 | * | |
1721 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1722 | * of calling its power down routine it will enable the given cpuidle state so | |
1723 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1724 | */ | |
1725 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1726 | { |
1727 | struct cpuidle_driver *cpuidle_drv; | |
1728 | struct gpd_cpu_data *cpu_data; | |
1729 | struct cpuidle_state *idle_state; | |
1730 | int ret = 0; | |
1731 | ||
1732 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1733 | return -EINVAL; | |
1734 | ||
1735 | genpd_acquire_lock(genpd); | |
1736 | ||
1737 | if (genpd->cpu_data) { | |
1738 | ret = -EEXIST; | |
1739 | goto out; | |
1740 | } | |
1741 | cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); | |
1742 | if (!cpu_data) { | |
1743 | ret = -ENOMEM; | |
1744 | goto out; | |
1745 | } | |
1746 | cpuidle_drv = cpuidle_driver_ref(); | |
1747 | if (!cpuidle_drv) { | |
1748 | ret = -ENODEV; | |
debe081a | 1749 | goto err_drv; |
cbc9ef02 RW |
1750 | } |
1751 | if (cpuidle_drv->state_count <= state) { | |
1752 | ret = -EINVAL; | |
1753 | goto err; | |
1754 | } | |
1755 | idle_state = &cpuidle_drv->states[state]; | |
1756 | if (!idle_state->disabled) { | |
1757 | ret = -EAGAIN; | |
1758 | goto err; | |
1759 | } | |
1760 | cpu_data->idle_state = idle_state; | |
1761 | cpu_data->saved_exit_latency = idle_state->exit_latency; | |
1762 | genpd->cpu_data = cpu_data; | |
1763 | genpd_recalc_cpu_exit_latency(genpd); | |
1764 | ||
1765 | out: | |
1766 | genpd_release_lock(genpd); | |
1767 | return ret; | |
1768 | ||
1769 | err: | |
1770 | cpuidle_driver_unref(); | |
debe081a | 1771 | |
1772 | err_drv: | |
1773 | kfree(cpu_data); | |
cbc9ef02 RW |
1774 | goto out; |
1775 | } | |
1776 | ||
74a2799a RW |
1777 | /** |
1778 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1779 | * @name: Name of the domain to connect to cpuidle. | |
1780 | * @state: cpuidle state this domain can manipulate. | |
1781 | */ | |
1782 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1783 | { | |
1784 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1785 | } | |
1786 | ||
40114447 RW |
1787 | /** |
1788 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1789 | * @genpd: PM domain to remove the cpuidle connection from. | |
1790 | * | |
1791 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1792 | * given PM domain. | |
1793 | */ | |
1794 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 RW |
1795 | { |
1796 | struct gpd_cpu_data *cpu_data; | |
1797 | struct cpuidle_state *idle_state; | |
1798 | int ret = 0; | |
1799 | ||
1800 | if (IS_ERR_OR_NULL(genpd)) | |
1801 | return -EINVAL; | |
1802 | ||
1803 | genpd_acquire_lock(genpd); | |
1804 | ||
1805 | cpu_data = genpd->cpu_data; | |
1806 | if (!cpu_data) { | |
1807 | ret = -ENODEV; | |
1808 | goto out; | |
1809 | } | |
1810 | idle_state = cpu_data->idle_state; | |
1811 | if (!idle_state->disabled) { | |
1812 | ret = -EAGAIN; | |
1813 | goto out; | |
1814 | } | |
1815 | idle_state->exit_latency = cpu_data->saved_exit_latency; | |
1816 | cpuidle_driver_unref(); | |
1817 | genpd->cpu_data = NULL; | |
1818 | kfree(cpu_data); | |
1819 | ||
1820 | out: | |
1821 | genpd_release_lock(genpd); | |
1822 | return ret; | |
1823 | } | |
1824 | ||
74a2799a RW |
1825 | /** |
1826 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1827 | * @name: Name of the domain to disconnect cpuidle from. | |
1828 | */ | |
1829 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1830 | { | |
1831 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1832 | } | |
1833 | ||
d23b9b00 RW |
1834 | /* Default device callbacks for generic PM domains. */ |
1835 | ||
ecf00475 | 1836 | /** |
12e10bb6 | 1837 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1838 | * @dev: Device to handle. |
1839 | */ | |
1840 | static int pm_genpd_default_save_state(struct device *dev) | |
1841 | { | |
1842 | int (*cb)(struct device *__dev); | |
ecf00475 | 1843 | |
0b589741 RW |
1844 | if (dev->type && dev->type->pm) |
1845 | cb = dev->type->pm->runtime_suspend; | |
1846 | else if (dev->class && dev->class->pm) | |
1847 | cb = dev->class->pm->runtime_suspend; | |
1848 | else if (dev->bus && dev->bus->pm) | |
1849 | cb = dev->bus->pm->runtime_suspend; | |
1850 | else | |
1851 | cb = NULL; | |
ecf00475 | 1852 | |
0b589741 RW |
1853 | if (!cb && dev->driver && dev->driver->pm) |
1854 | cb = dev->driver->pm->runtime_suspend; | |
1855 | ||
1856 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1857 | } |
1858 | ||
1859 | /** | |
12e10bb6 | 1860 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1861 | * @dev: Device to handle. |
1862 | */ | |
1863 | static int pm_genpd_default_restore_state(struct device *dev) | |
1864 | { | |
1865 | int (*cb)(struct device *__dev); | |
ecf00475 | 1866 | |
0b589741 RW |
1867 | if (dev->type && dev->type->pm) |
1868 | cb = dev->type->pm->runtime_resume; | |
1869 | else if (dev->class && dev->class->pm) | |
1870 | cb = dev->class->pm->runtime_resume; | |
1871 | else if (dev->bus && dev->bus->pm) | |
1872 | cb = dev->bus->pm->runtime_resume; | |
1873 | else | |
1874 | cb = NULL; | |
ecf00475 | 1875 | |
0b589741 RW |
1876 | if (!cb && dev->driver && dev->driver->pm) |
1877 | cb = dev->driver->pm->runtime_resume; | |
1878 | ||
1879 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1880 | } |
1881 | ||
f721889f RW |
1882 | /** |
1883 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1884 | * @genpd: PM domain object to initialize. | |
1885 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1886 | * @is_off: Initial value of the domain's power_is_off field. | |
1887 | */ | |
1888 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1889 | struct dev_power_governor *gov, bool is_off) | |
1890 | { | |
1891 | if (IS_ERR_OR_NULL(genpd)) | |
1892 | return; | |
1893 | ||
5063ce15 RW |
1894 | INIT_LIST_HEAD(&genpd->master_links); |
1895 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1896 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1897 | mutex_init(&genpd->lock); |
1898 | genpd->gov = gov; | |
1899 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1900 | genpd->in_progress = 0; | |
c4bb3160 | 1901 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1902 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1903 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1904 | genpd->poweroff_task = NULL; |
1905 | genpd->resume_count = 0; | |
596ba34b | 1906 | genpd->device_count = 0; |
221e9b58 | 1907 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1908 | genpd->max_off_time_changed = true; |
f721889f RW |
1909 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1910 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1911 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1912 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1913 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1914 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1915 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1916 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1917 | genpd->domain.ops.resume = pm_genpd_resume; |
1918 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1919 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1920 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1921 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1922 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1923 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1924 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1925 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1926 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1927 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1928 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1929 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1930 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1931 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1932 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
5125bbf3 RW |
1933 | mutex_lock(&gpd_list_lock); |
1934 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1935 | mutex_unlock(&gpd_list_lock); | |
1936 | } | |
aa42240a TF |
1937 | |
1938 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1939 | /* | |
1940 | * Device Tree based PM domain providers. | |
1941 | * | |
1942 | * The code below implements generic device tree based PM domain providers that | |
1943 | * bind device tree nodes with generic PM domains registered in the system. | |
1944 | * | |
1945 | * Any driver that registers generic PM domains and needs to support binding of | |
1946 | * devices to these domains is supposed to register a PM domain provider, which | |
1947 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1948 | * | |
1949 | * Two simple mapping functions have been provided for convenience: | |
1950 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1951 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1952 | * index. | |
1953 | */ | |
1954 | ||
1955 | /** | |
1956 | * struct of_genpd_provider - PM domain provider registration structure | |
1957 | * @link: Entry in global list of PM domain providers | |
1958 | * @node: Pointer to device tree node of PM domain provider | |
1959 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1960 | * into a PM domain. | |
1961 | * @data: context pointer to be passed into @xlate callback | |
1962 | */ | |
1963 | struct of_genpd_provider { | |
1964 | struct list_head link; | |
1965 | struct device_node *node; | |
1966 | genpd_xlate_t xlate; | |
1967 | void *data; | |
1968 | }; | |
1969 | ||
1970 | /* List of registered PM domain providers. */ | |
1971 | static LIST_HEAD(of_genpd_providers); | |
1972 | /* Mutex to protect the list above. */ | |
1973 | static DEFINE_MUTEX(of_genpd_mutex); | |
1974 | ||
1975 | /** | |
1976 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1977 | * @genpdspec: OF phandle args to map into a PM domain | |
1978 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1979 | * | |
1980 | * This is a generic xlate function that can be used to model PM domains that | |
1981 | * have their own device tree nodes. The private data of xlate function needs | |
1982 | * to be a valid pointer to struct generic_pm_domain. | |
1983 | */ | |
1984 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1985 | struct of_phandle_args *genpdspec, | |
1986 | void *data) | |
1987 | { | |
1988 | if (genpdspec->args_count != 0) | |
1989 | return ERR_PTR(-EINVAL); | |
1990 | return data; | |
1991 | } | |
1992 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1993 | ||
1994 | /** | |
1995 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1996 | * @genpdspec: OF phandle args to map into a PM domain | |
1997 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1998 | * | |
1999 | * This is a generic xlate function that can be used to model simple PM domain | |
2000 | * controllers that have one device tree node and provide multiple PM domains. | |
2001 | * A single cell is used as an index into an array of PM domains specified in | |
2002 | * the genpd_onecell_data struct when registering the provider. | |
2003 | */ | |
2004 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
2005 | struct of_phandle_args *genpdspec, | |
2006 | void *data) | |
2007 | { | |
2008 | struct genpd_onecell_data *genpd_data = data; | |
2009 | unsigned int idx = genpdspec->args[0]; | |
2010 | ||
2011 | if (genpdspec->args_count != 1) | |
2012 | return ERR_PTR(-EINVAL); | |
2013 | ||
2014 | if (idx >= genpd_data->num_domains) { | |
2015 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2016 | return ERR_PTR(-EINVAL); | |
2017 | } | |
2018 | ||
2019 | if (!genpd_data->domains[idx]) | |
2020 | return ERR_PTR(-ENOENT); | |
2021 | ||
2022 | return genpd_data->domains[idx]; | |
2023 | } | |
2024 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
2025 | ||
2026 | /** | |
2027 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
2028 | * @np: Device node pointer associated with the PM domain provider. | |
2029 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2030 | * @data: Context pointer for @xlate callback. | |
2031 | */ | |
2032 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
2033 | void *data) | |
2034 | { | |
2035 | struct of_genpd_provider *cp; | |
2036 | ||
2037 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2038 | if (!cp) | |
2039 | return -ENOMEM; | |
2040 | ||
2041 | cp->node = of_node_get(np); | |
2042 | cp->data = data; | |
2043 | cp->xlate = xlate; | |
2044 | ||
2045 | mutex_lock(&of_genpd_mutex); | |
2046 | list_add(&cp->link, &of_genpd_providers); | |
2047 | mutex_unlock(&of_genpd_mutex); | |
2048 | pr_debug("Added domain provider from %s\n", np->full_name); | |
2049 | ||
2050 | return 0; | |
2051 | } | |
2052 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
2053 | ||
2054 | /** | |
2055 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2056 | * @np: Device node pointer associated with the PM domain provider | |
2057 | */ | |
2058 | void of_genpd_del_provider(struct device_node *np) | |
2059 | { | |
2060 | struct of_genpd_provider *cp; | |
2061 | ||
2062 | mutex_lock(&of_genpd_mutex); | |
2063 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
2064 | if (cp->node == np) { | |
2065 | list_del(&cp->link); | |
2066 | of_node_put(cp->node); | |
2067 | kfree(cp); | |
2068 | break; | |
2069 | } | |
2070 | } | |
2071 | mutex_unlock(&of_genpd_mutex); | |
2072 | } | |
2073 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2074 | ||
2075 | /** | |
2076 | * of_genpd_get_from_provider() - Look-up PM domain | |
2077 | * @genpdspec: OF phandle args to use for look-up | |
2078 | * | |
2079 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2080 | * found, uses xlate function of the provider to map phandle args to a PM | |
2081 | * domain. | |
2082 | * | |
2083 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2084 | * on failure. | |
2085 | */ | |
2086 | static struct generic_pm_domain *of_genpd_get_from_provider( | |
2087 | struct of_phandle_args *genpdspec) | |
2088 | { | |
2089 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2090 | struct of_genpd_provider *provider; | |
2091 | ||
2092 | mutex_lock(&of_genpd_mutex); | |
2093 | ||
2094 | /* Check if we have such a provider in our array */ | |
2095 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2096 | if (provider->node == genpdspec->np) | |
2097 | genpd = provider->xlate(genpdspec, provider->data); | |
2098 | if (!IS_ERR(genpd)) | |
2099 | break; | |
2100 | } | |
2101 | ||
2102 | mutex_unlock(&of_genpd_mutex); | |
2103 | ||
2104 | return genpd; | |
2105 | } | |
2106 | ||
2107 | /** | |
2108 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
2109 | * @dev: Device to attach. | |
2110 | * @power_off: Currently not used | |
2111 | * | |
2112 | * Try to locate a corresponding generic PM domain, which the device was | |
2113 | * attached to previously. If such is found, the device is detached from it. | |
2114 | */ | |
2115 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2116 | { | |
2117 | struct generic_pm_domain *pd = NULL, *gpd; | |
2118 | int ret = 0; | |
2119 | ||
2120 | if (!dev->pm_domain) | |
2121 | return; | |
2122 | ||
2123 | mutex_lock(&gpd_list_lock); | |
2124 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2125 | if (&gpd->domain == dev->pm_domain) { | |
2126 | pd = gpd; | |
2127 | break; | |
2128 | } | |
2129 | } | |
2130 | mutex_unlock(&gpd_list_lock); | |
2131 | ||
2132 | if (!pd) | |
2133 | return; | |
2134 | ||
2135 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2136 | ||
2137 | while (1) { | |
2138 | ret = pm_genpd_remove_device(pd, dev); | |
2139 | if (ret != -EAGAIN) | |
2140 | break; | |
2141 | cond_resched(); | |
2142 | } | |
2143 | ||
2144 | if (ret < 0) { | |
2145 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2146 | pd->name, ret); | |
2147 | return; | |
2148 | } | |
2149 | ||
2150 | /* Check if PM domain can be powered off after removing this device. */ | |
2151 | genpd_queue_power_off_work(pd); | |
2152 | } | |
2153 | ||
2154 | /** | |
2155 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2156 | * @dev: Device to attach. | |
2157 | * | |
2158 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2159 | * attaches the device to retrieved pm_domain ops. | |
2160 | * | |
2161 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2162 | * backwards compatibility with existing DTBs. | |
2163 | * | |
2164 | * Returns 0 on successfully attached PM domain or negative error code. | |
2165 | */ | |
2166 | int genpd_dev_pm_attach(struct device *dev) | |
2167 | { | |
2168 | struct of_phandle_args pd_args; | |
2169 | struct generic_pm_domain *pd; | |
2170 | int ret; | |
2171 | ||
2172 | if (!dev->of_node) | |
2173 | return -ENODEV; | |
2174 | ||
2175 | if (dev->pm_domain) | |
2176 | return -EEXIST; | |
2177 | ||
2178 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2179 | "#power-domain-cells", 0, &pd_args); | |
2180 | if (ret < 0) { | |
2181 | if (ret != -ENOENT) | |
2182 | return ret; | |
2183 | ||
2184 | /* | |
2185 | * Try legacy Samsung-specific bindings | |
2186 | * (for backwards compatibility of DT ABI) | |
2187 | */ | |
2188 | pd_args.args_count = 0; | |
2189 | pd_args.np = of_parse_phandle(dev->of_node, | |
2190 | "samsung,power-domain", 0); | |
2191 | if (!pd_args.np) | |
2192 | return -ENOENT; | |
2193 | } | |
2194 | ||
2195 | pd = of_genpd_get_from_provider(&pd_args); | |
2196 | if (IS_ERR(pd)) { | |
2197 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
2198 | __func__, PTR_ERR(pd)); | |
2199 | of_node_put(dev->of_node); | |
2200 | return PTR_ERR(pd); | |
2201 | } | |
2202 | ||
2203 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2204 | ||
2205 | while (1) { | |
2206 | ret = pm_genpd_add_device(pd, dev); | |
2207 | if (ret != -EAGAIN) | |
2208 | break; | |
2209 | cond_resched(); | |
2210 | } | |
2211 | ||
2212 | if (ret < 0) { | |
2213 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2214 | pd->name, ret); | |
2215 | of_node_put(dev->of_node); | |
2216 | return ret; | |
2217 | } | |
2218 | ||
2219 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
2220 | ||
2221 | return 0; | |
2222 | } | |
2223 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
2224 | #endif |