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> | |
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 | ||
f39cb179 | 145 | if (!genpd->cpuidle_data) |
cbc9ef02 RW |
146 | return; |
147 | ||
148 | usecs64 = genpd->power_on_latency_ns; | |
149 | do_div(usecs64, NSEC_PER_USEC); | |
f39cb179 UH |
150 | usecs64 += genpd->cpuidle_data->saved_exit_latency; |
151 | genpd->cpuidle_data->idle_state->exit_latency = usecs64; | |
cbc9ef02 RW |
152 | } |
153 | ||
c8f0ea45 GU |
154 | static int genpd_power_on(struct generic_pm_domain *genpd) |
155 | { | |
156 | ktime_t time_start; | |
157 | s64 elapsed_ns; | |
158 | int ret; | |
159 | ||
160 | if (!genpd->power_on) | |
161 | return 0; | |
162 | ||
163 | time_start = ktime_get(); | |
164 | ret = genpd->power_on(genpd); | |
165 | if (ret) | |
166 | return ret; | |
167 | ||
168 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
169 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
170 | return ret; | |
171 | ||
172 | genpd->power_on_latency_ns = elapsed_ns; | |
173 | genpd->max_off_time_changed = true; | |
174 | genpd_recalc_cpu_exit_latency(genpd); | |
175 | pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n", | |
176 | genpd->name, "on", elapsed_ns); | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
181 | static int genpd_power_off(struct generic_pm_domain *genpd) | |
182 | { | |
183 | ktime_t time_start; | |
184 | s64 elapsed_ns; | |
185 | int ret; | |
186 | ||
187 | if (!genpd->power_off) | |
188 | return 0; | |
189 | ||
190 | time_start = ktime_get(); | |
191 | ret = genpd->power_off(genpd); | |
192 | if (ret == -EBUSY) | |
193 | return ret; | |
194 | ||
195 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
196 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
197 | return ret; | |
198 | ||
199 | genpd->power_off_latency_ns = elapsed_ns; | |
200 | genpd->max_off_time_changed = true; | |
201 | pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n", | |
202 | genpd->name, "off", elapsed_ns); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
5248051b | 207 | /** |
5063ce15 | 208 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
209 | * @genpd: PM domain to power up. |
210 | * | |
5063ce15 | 211 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
212 | * resume a device belonging to it. |
213 | */ | |
8951ef02 | 214 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 215 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 216 | { |
5063ce15 | 217 | struct gpd_link *link; |
3f241775 | 218 | DEFINE_WAIT(wait); |
5248051b RW |
219 | int ret = 0; |
220 | ||
5063ce15 | 221 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
222 | for (;;) { |
223 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
224 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 225 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
226 | break; |
227 | mutex_unlock(&genpd->lock); | |
17b75eca | 228 | |
3f241775 RW |
229 | schedule(); |
230 | ||
231 | mutex_lock(&genpd->lock); | |
232 | } | |
233 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 234 | |
17b75eca | 235 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 236 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 237 | return 0; |
5248051b | 238 | |
c6d22b37 RW |
239 | if (genpd->status != GPD_STATE_POWER_OFF) { |
240 | genpd_set_active(genpd); | |
3f241775 | 241 | return 0; |
c6d22b37 RW |
242 | } |
243 | ||
f39cb179 | 244 | if (genpd->cpuidle_data) { |
cbc9ef02 | 245 | cpuidle_pause_and_lock(); |
f39cb179 | 246 | genpd->cpuidle_data->idle_state->disabled = true; |
cbc9ef02 RW |
247 | cpuidle_resume_and_unlock(); |
248 | goto out; | |
249 | } | |
250 | ||
5063ce15 RW |
251 | /* |
252 | * The list is guaranteed not to change while the loop below is being | |
253 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
254 | * with it. | |
255 | */ | |
256 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
257 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 258 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 259 | |
5248051b | 260 | mutex_unlock(&genpd->lock); |
5248051b | 261 | |
5063ce15 | 262 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
263 | |
264 | mutex_lock(&genpd->lock); | |
265 | ||
3f241775 RW |
266 | /* |
267 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 268 | * while the master is powering on. |
3f241775 RW |
269 | */ |
270 | genpd->status = GPD_STATE_POWER_OFF; | |
271 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
272 | if (ret) { |
273 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 274 | goto err; |
5063ce15 | 275 | } |
5248051b RW |
276 | } |
277 | ||
c8f0ea45 GU |
278 | ret = genpd_power_on(genpd); |
279 | if (ret) | |
280 | goto err; | |
5248051b | 281 | |
cbc9ef02 | 282 | out: |
9e08cf42 RW |
283 | genpd_set_active(genpd); |
284 | ||
3f241775 | 285 | return 0; |
9e08cf42 RW |
286 | |
287 | err: | |
5063ce15 RW |
288 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
289 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 290 | |
3f241775 RW |
291 | return ret; |
292 | } | |
293 | ||
294 | /** | |
5063ce15 | 295 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
296 | * @genpd: PM domain to power up. |
297 | */ | |
298 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
299 | { | |
300 | int ret; | |
301 | ||
302 | mutex_lock(&genpd->lock); | |
303 | ret = __pm_genpd_poweron(genpd); | |
304 | mutex_unlock(&genpd->lock); | |
305 | return ret; | |
5248051b RW |
306 | } |
307 | ||
8bc0251d RW |
308 | /** |
309 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
310 | * @domain_name: Name of the PM domain to power up. | |
311 | */ | |
312 | int pm_genpd_name_poweron(const char *domain_name) | |
313 | { | |
314 | struct generic_pm_domain *genpd; | |
315 | ||
316 | genpd = pm_genpd_lookup_name(domain_name); | |
317 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
318 | } | |
319 | ||
5248051b RW |
320 | #ifdef CONFIG_PM_RUNTIME |
321 | ||
b3d3b9fb SK |
322 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
323 | struct device *dev) | |
324 | { | |
325 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
326 | } | |
327 | ||
8e9afafd RW |
328 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
329 | { | |
330 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
331 | save_state_latency_ns, "state save"); | |
332 | } | |
333 | ||
334 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
335 | { | |
336 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
337 | restore_state_latency_ns, | |
338 | "state restore"); | |
339 | } | |
340 | ||
6ff7bb0d RW |
341 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
342 | unsigned long val, void *ptr) | |
343 | { | |
344 | struct generic_pm_domain_data *gpd_data; | |
345 | struct device *dev; | |
346 | ||
347 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
348 | ||
349 | mutex_lock(&gpd_data->lock); | |
350 | dev = gpd_data->base.dev; | |
351 | if (!dev) { | |
352 | mutex_unlock(&gpd_data->lock); | |
353 | return NOTIFY_DONE; | |
354 | } | |
355 | mutex_unlock(&gpd_data->lock); | |
356 | ||
357 | for (;;) { | |
358 | struct generic_pm_domain *genpd; | |
359 | struct pm_domain_data *pdd; | |
360 | ||
361 | spin_lock_irq(&dev->power.lock); | |
362 | ||
363 | pdd = dev->power.subsys_data ? | |
364 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 365 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
366 | to_gpd_data(pdd)->td.constraint_changed = true; |
367 | genpd = dev_to_genpd(dev); | |
368 | } else { | |
369 | genpd = ERR_PTR(-ENODATA); | |
370 | } | |
371 | ||
372 | spin_unlock_irq(&dev->power.lock); | |
373 | ||
374 | if (!IS_ERR(genpd)) { | |
375 | mutex_lock(&genpd->lock); | |
376 | genpd->max_off_time_changed = true; | |
377 | mutex_unlock(&genpd->lock); | |
378 | } | |
379 | ||
380 | dev = dev->parent; | |
381 | if (!dev || dev->power.ignore_children) | |
382 | break; | |
383 | } | |
384 | ||
385 | return NOTIFY_DONE; | |
386 | } | |
387 | ||
f721889f RW |
388 | /** |
389 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 390 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
391 | * @genpd: PM domain the device belongs to. |
392 | */ | |
4605ab65 | 393 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 394 | struct generic_pm_domain *genpd) |
17b75eca | 395 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 396 | { |
cd0ea672 | 397 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 398 | struct device *dev = pdd->dev; |
f721889f RW |
399 | int ret = 0; |
400 | ||
67732cd3 | 401 | if (gpd_data->need_restore > 0) |
f721889f RW |
402 | return 0; |
403 | ||
67732cd3 UH |
404 | /* |
405 | * If the value of the need_restore flag is still unknown at this point, | |
406 | * we trust that pm_genpd_poweroff() has verified that the device is | |
407 | * already runtime PM suspended. | |
408 | */ | |
409 | if (gpd_data->need_restore < 0) { | |
410 | gpd_data->need_restore = 1; | |
411 | return 0; | |
412 | } | |
413 | ||
17b75eca RW |
414 | mutex_unlock(&genpd->lock); |
415 | ||
ecf00475 RW |
416 | genpd_start_dev(genpd, dev); |
417 | ret = genpd_save_dev(genpd, dev); | |
418 | genpd_stop_dev(genpd, dev); | |
f721889f | 419 | |
17b75eca RW |
420 | mutex_lock(&genpd->lock); |
421 | ||
f721889f | 422 | if (!ret) |
67732cd3 | 423 | gpd_data->need_restore = 1; |
f721889f RW |
424 | |
425 | return ret; | |
426 | } | |
427 | ||
428 | /** | |
429 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 430 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
431 | * @genpd: PM domain the device belongs to. |
432 | */ | |
4605ab65 | 433 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 434 | struct generic_pm_domain *genpd) |
17b75eca | 435 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 436 | { |
cd0ea672 | 437 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 438 | struct device *dev = pdd->dev; |
67732cd3 | 439 | int need_restore = gpd_data->need_restore; |
f721889f | 440 | |
67732cd3 | 441 | gpd_data->need_restore = 0; |
17b75eca RW |
442 | mutex_unlock(&genpd->lock); |
443 | ||
ecf00475 | 444 | genpd_start_dev(genpd, dev); |
67732cd3 UH |
445 | |
446 | /* | |
447 | * Call genpd_restore_dev() for recently added devices too (need_restore | |
448 | * is negative then). | |
449 | */ | |
80de3d7f RW |
450 | if (need_restore) |
451 | genpd_restore_dev(genpd, dev); | |
f721889f | 452 | |
17b75eca | 453 | mutex_lock(&genpd->lock); |
f721889f RW |
454 | } |
455 | ||
c6d22b37 RW |
456 | /** |
457 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
458 | * @genpd: PM domain to check. | |
459 | * | |
460 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
461 | * a "power off" operation, which means that a "power on" has occured in the | |
462 | * meantime, or if its resume_count field is different from zero, which means | |
463 | * that one of its devices has been resumed in the meantime. | |
464 | */ | |
465 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
466 | { | |
17877eb5 | 467 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 468 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
469 | } |
470 | ||
56375fd4 RW |
471 | /** |
472 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
473 | * @genpd: PM domait to power off. | |
474 | * | |
475 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
476 | * before. | |
477 | */ | |
d971f0b0 | 478 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 479 | { |
a4ca26a4 | 480 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
481 | } |
482 | ||
f721889f RW |
483 | /** |
484 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
485 | * @genpd: PM domain to power down. | |
486 | * | |
487 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
488 | * have been powered down, run the runtime suspend callbacks provided by all of | |
489 | * the @genpd's devices' drivers and remove power from @genpd. | |
490 | */ | |
491 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 492 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 493 | { |
4605ab65 | 494 | struct pm_domain_data *pdd; |
5063ce15 | 495 | struct gpd_link *link; |
f721889f | 496 | unsigned int not_suspended; |
c6d22b37 | 497 | int ret = 0; |
f721889f | 498 | |
c6d22b37 RW |
499 | start: |
500 | /* | |
501 | * Do not try to power off the domain in the following situations: | |
502 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 503 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 504 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 505 | * (4) System suspend is in progress. |
c6d22b37 | 506 | */ |
3f241775 | 507 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 508 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 509 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
510 | return 0; |
511 | ||
c4bb3160 | 512 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
513 | return -EBUSY; |
514 | ||
515 | not_suspended = 0; | |
34b1f762 RW |
516 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
517 | enum pm_qos_flags_status stat; | |
518 | ||
519 | stat = dev_pm_qos_flags(pdd->dev, | |
520 | PM_QOS_FLAG_NO_POWER_OFF | |
521 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
522 | if (stat > PM_QOS_FLAGS_NONE) | |
523 | return -EBUSY; | |
524 | ||
0aa2a221 | 525 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 526 | || pdd->dev->power.irq_safe)) |
f721889f | 527 | not_suspended++; |
34b1f762 | 528 | } |
f721889f RW |
529 | |
530 | if (not_suspended > genpd->in_progress) | |
531 | return -EBUSY; | |
532 | ||
c6d22b37 RW |
533 | if (genpd->poweroff_task) { |
534 | /* | |
535 | * Another instance of pm_genpd_poweroff() is executing | |
536 | * callbacks, so tell it to start over and return. | |
537 | */ | |
538 | genpd->status = GPD_STATE_REPEAT; | |
539 | return 0; | |
540 | } | |
541 | ||
f721889f RW |
542 | if (genpd->gov && genpd->gov->power_down_ok) { |
543 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
544 | return -EAGAIN; | |
545 | } | |
546 | ||
17b75eca | 547 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 548 | genpd->poweroff_task = current; |
17b75eca | 549 | |
4605ab65 | 550 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 551 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 552 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
553 | |
554 | if (genpd_abort_poweroff(genpd)) | |
555 | goto out; | |
556 | ||
697a7f37 RW |
557 | if (ret) { |
558 | genpd_set_active(genpd); | |
559 | goto out; | |
560 | } | |
f721889f | 561 | |
c6d22b37 RW |
562 | if (genpd->status == GPD_STATE_REPEAT) { |
563 | genpd->poweroff_task = NULL; | |
564 | goto start; | |
565 | } | |
566 | } | |
17b75eca | 567 | |
f39cb179 | 568 | if (genpd->cpuidle_data) { |
cbc9ef02 | 569 | /* |
f39cb179 UH |
570 | * If cpuidle_data is set, cpuidle should turn the domain off |
571 | * when the CPU in it is idle. In that case we don't decrement | |
572 | * the subdomain counts of the master domains, so that power is | |
573 | * not removed from the current domain prematurely as a result | |
574 | * of cutting off the masters' power. | |
cbc9ef02 RW |
575 | */ |
576 | genpd->status = GPD_STATE_POWER_OFF; | |
577 | cpuidle_pause_and_lock(); | |
f39cb179 | 578 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 RW |
579 | cpuidle_resume_and_unlock(); |
580 | goto out; | |
581 | } | |
582 | ||
3c07cbc4 RW |
583 | if (genpd->power_off) { |
584 | if (atomic_read(&genpd->sd_count) > 0) { | |
585 | ret = -EBUSY; | |
c6d22b37 RW |
586 | goto out; |
587 | } | |
17b75eca | 588 | |
3c07cbc4 | 589 | /* |
5063ce15 RW |
590 | * If sd_count > 0 at this point, one of the subdomains hasn't |
591 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
592 | * incrementing it. In that case pm_genpd_poweron() will wait |
593 | * for us to drop the lock, so we can call .power_off() and let | |
594 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
595 | * happen very often). | |
596 | */ | |
c8f0ea45 | 597 | ret = genpd_power_off(genpd); |
d2805402 RW |
598 | if (ret == -EBUSY) { |
599 | genpd_set_active(genpd); | |
d2805402 RW |
600 | goto out; |
601 | } | |
602 | } | |
f721889f | 603 | |
17b75eca | 604 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 605 | |
5063ce15 RW |
606 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
607 | genpd_sd_counter_dec(link->master); | |
608 | genpd_queue_power_off_work(link->master); | |
609 | } | |
f721889f | 610 | |
c6d22b37 RW |
611 | out: |
612 | genpd->poweroff_task = NULL; | |
613 | wake_up_all(&genpd->status_wait_queue); | |
614 | return ret; | |
f721889f RW |
615 | } |
616 | ||
617 | /** | |
618 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
619 | * @work: Work structure used for scheduling the execution of this function. | |
620 | */ | |
621 | static void genpd_power_off_work_fn(struct work_struct *work) | |
622 | { | |
623 | struct generic_pm_domain *genpd; | |
624 | ||
625 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
626 | ||
17b75eca | 627 | genpd_acquire_lock(genpd); |
f721889f | 628 | pm_genpd_poweroff(genpd); |
17b75eca | 629 | genpd_release_lock(genpd); |
f721889f RW |
630 | } |
631 | ||
632 | /** | |
633 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
634 | * @dev: Device to suspend. | |
635 | * | |
636 | * Carry out a runtime suspend of a device under the assumption that its | |
637 | * pm_domain field points to the domain member of an object of type | |
638 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
639 | */ | |
640 | static int pm_genpd_runtime_suspend(struct device *dev) | |
641 | { | |
642 | struct generic_pm_domain *genpd; | |
67732cd3 | 643 | struct generic_pm_domain_data *gpd_data; |
b02c999a | 644 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 645 | int ret; |
f721889f RW |
646 | |
647 | dev_dbg(dev, "%s()\n", __func__); | |
648 | ||
5248051b RW |
649 | genpd = dev_to_genpd(dev); |
650 | if (IS_ERR(genpd)) | |
f721889f RW |
651 | return -EINVAL; |
652 | ||
b02c999a RW |
653 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
654 | if (stop_ok && !stop_ok(dev)) | |
655 | return -EBUSY; | |
656 | ||
d5e4cbfe RW |
657 | ret = genpd_stop_dev(genpd, dev); |
658 | if (ret) | |
659 | return ret; | |
17b75eca | 660 | |
0aa2a221 RW |
661 | /* |
662 | * If power.irq_safe is set, this routine will be run with interrupts | |
663 | * off, so it can't use mutexes. | |
664 | */ | |
665 | if (dev->power.irq_safe) | |
666 | return 0; | |
667 | ||
c6d22b37 | 668 | mutex_lock(&genpd->lock); |
67732cd3 UH |
669 | |
670 | /* | |
671 | * If we have an unknown state of the need_restore flag, it means none | |
672 | * of the runtime PM callbacks has been invoked yet. Let's update the | |
673 | * flag to reflect that the current state is active. | |
674 | */ | |
675 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
676 | if (gpd_data->need_restore < 0) | |
677 | gpd_data->need_restore = 0; | |
678 | ||
f721889f RW |
679 | genpd->in_progress++; |
680 | pm_genpd_poweroff(genpd); | |
681 | genpd->in_progress--; | |
c6d22b37 | 682 | mutex_unlock(&genpd->lock); |
f721889f RW |
683 | |
684 | return 0; | |
685 | } | |
686 | ||
f721889f RW |
687 | /** |
688 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
689 | * @dev: Device to resume. | |
690 | * | |
691 | * Carry out a runtime resume of a device under the assumption that its | |
692 | * pm_domain field points to the domain member of an object of type | |
693 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
694 | */ | |
695 | static int pm_genpd_runtime_resume(struct device *dev) | |
696 | { | |
697 | struct generic_pm_domain *genpd; | |
c6d22b37 | 698 | DEFINE_WAIT(wait); |
f721889f RW |
699 | int ret; |
700 | ||
701 | dev_dbg(dev, "%s()\n", __func__); | |
702 | ||
5248051b RW |
703 | genpd = dev_to_genpd(dev); |
704 | if (IS_ERR(genpd)) | |
f721889f RW |
705 | return -EINVAL; |
706 | ||
0aa2a221 RW |
707 | /* If power.irq_safe, the PM domain is never powered off. */ |
708 | if (dev->power.irq_safe) | |
e2e3e4e5 | 709 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 710 | |
c6d22b37 | 711 | mutex_lock(&genpd->lock); |
3f241775 RW |
712 | ret = __pm_genpd_poweron(genpd); |
713 | if (ret) { | |
714 | mutex_unlock(&genpd->lock); | |
715 | return ret; | |
716 | } | |
17b75eca | 717 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
718 | genpd->resume_count++; |
719 | for (;;) { | |
720 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
721 | TASK_UNINTERRUPTIBLE); | |
722 | /* | |
723 | * If current is the powering off task, we have been called | |
724 | * reentrantly from one of the device callbacks, so we should | |
725 | * not wait. | |
726 | */ | |
727 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
728 | break; | |
729 | mutex_unlock(&genpd->lock); | |
730 | ||
731 | schedule(); | |
732 | ||
733 | mutex_lock(&genpd->lock); | |
734 | } | |
735 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 736 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
737 | genpd->resume_count--; |
738 | genpd_set_active(genpd); | |
17b75eca | 739 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 740 | mutex_unlock(&genpd->lock); |
17b75eca | 741 | |
f721889f RW |
742 | return 0; |
743 | } | |
744 | ||
39ac5ba5 TB |
745 | static bool pd_ignore_unused; |
746 | static int __init pd_ignore_unused_setup(char *__unused) | |
747 | { | |
748 | pd_ignore_unused = true; | |
749 | return 1; | |
750 | } | |
751 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
752 | ||
17f2ae7f RW |
753 | /** |
754 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
755 | */ | |
756 | void pm_genpd_poweroff_unused(void) | |
757 | { | |
758 | struct generic_pm_domain *genpd; | |
759 | ||
39ac5ba5 TB |
760 | if (pd_ignore_unused) { |
761 | pr_warn("genpd: Not disabling unused power domains\n"); | |
762 | return; | |
763 | } | |
764 | ||
17f2ae7f RW |
765 | mutex_lock(&gpd_list_lock); |
766 | ||
767 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
768 | genpd_queue_power_off_work(genpd); | |
769 | ||
770 | mutex_unlock(&gpd_list_lock); | |
771 | } | |
772 | ||
2fe71dcd UH |
773 | static int __init genpd_poweroff_unused(void) |
774 | { | |
775 | pm_genpd_poweroff_unused(); | |
776 | return 0; | |
777 | } | |
778 | late_initcall(genpd_poweroff_unused); | |
779 | ||
f721889f RW |
780 | #else |
781 | ||
6ff7bb0d RW |
782 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
783 | unsigned long val, void *ptr) | |
784 | { | |
785 | return NOTIFY_DONE; | |
786 | } | |
787 | ||
d971f0b0 UH |
788 | static inline void |
789 | genpd_queue_power_off_work(struct generic_pm_domain *genpd) {} | |
790 | ||
f721889f RW |
791 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
792 | ||
793 | #define pm_genpd_runtime_suspend NULL | |
794 | #define pm_genpd_runtime_resume NULL | |
795 | ||
796 | #endif /* CONFIG_PM_RUNTIME */ | |
797 | ||
596ba34b RW |
798 | #ifdef CONFIG_PM_SLEEP |
799 | ||
77f827de RW |
800 | /** |
801 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
802 | * @genpd: PM domain to check. | |
803 | */ | |
895b31f3 | 804 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 805 | { |
895b31f3 | 806 | const struct generic_pm_domain *gpd; |
77f827de RW |
807 | |
808 | if (IS_ERR_OR_NULL(genpd)) | |
809 | return false; | |
810 | ||
811 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
812 | if (gpd == genpd) | |
813 | return true; | |
814 | ||
815 | return false; | |
816 | } | |
817 | ||
d5e4cbfe RW |
818 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
819 | struct device *dev) | |
820 | { | |
821 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
822 | } | |
823 | ||
596ba34b | 824 | /** |
5063ce15 | 825 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
826 | * @genpd: PM domain to power off, if possible. |
827 | * | |
828 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 829 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 830 | * |
77f827de RW |
831 | * This function is only called in "noirq" and "syscore" stages of system power |
832 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
833 | * executed sequentially, so it is guaranteed that it will never run twice in | |
834 | * parallel). | |
596ba34b RW |
835 | */ |
836 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
837 | { | |
5063ce15 | 838 | struct gpd_link *link; |
596ba34b | 839 | |
17b75eca | 840 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
841 | return; |
842 | ||
c4bb3160 RW |
843 | if (genpd->suspended_count != genpd->device_count |
844 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
845 | return; |
846 | ||
c8f0ea45 | 847 | genpd_power_off(genpd); |
596ba34b | 848 | |
17b75eca | 849 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
850 | |
851 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
852 | genpd_sd_counter_dec(link->master); | |
853 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
854 | } |
855 | } | |
856 | ||
802d8b49 RW |
857 | /** |
858 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
859 | * @genpd: PM domain to power on. | |
860 | * | |
77f827de RW |
861 | * This function is only called in "noirq" and "syscore" stages of system power |
862 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
863 | * executed sequentially, so it is guaranteed that it will never run twice in | |
864 | * parallel). | |
802d8b49 RW |
865 | */ |
866 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
867 | { | |
868 | struct gpd_link *link; | |
869 | ||
870 | if (genpd->status != GPD_STATE_POWER_OFF) | |
871 | return; | |
872 | ||
873 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
874 | pm_genpd_sync_poweron(link->master); | |
875 | genpd_sd_counter_inc(link->master); | |
876 | } | |
877 | ||
c8f0ea45 | 878 | genpd_power_on(genpd); |
802d8b49 RW |
879 | |
880 | genpd->status = GPD_STATE_ACTIVE; | |
881 | } | |
882 | ||
4ecd6e65 RW |
883 | /** |
884 | * resume_needed - Check whether to resume a device before system suspend. | |
885 | * @dev: Device to check. | |
886 | * @genpd: PM domain the device belongs to. | |
887 | * | |
888 | * There are two cases in which a device that can wake up the system from sleep | |
889 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
890 | * to wake up the system and it has to remain active for this purpose while the | |
891 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
892 | * the system from sleep states and it generally doesn't generate wakeup signals | |
893 | * by itself (those signals are generated on its behalf by other parts of the | |
894 | * system). In the latter case it may be necessary to reconfigure the device's | |
895 | * wakeup settings during system suspend, because it may have been set up to | |
896 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
897 | * Return 'true' in either of the above cases. | |
898 | */ | |
899 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
900 | { | |
901 | bool active_wakeup; | |
902 | ||
903 | if (!device_can_wakeup(dev)) | |
904 | return false; | |
905 | ||
d5e4cbfe | 906 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
907 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
908 | } | |
909 | ||
596ba34b RW |
910 | /** |
911 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
912 | * @dev: Device to start the transition of. | |
913 | * | |
914 | * Start a power transition of a device (during a system-wide power transition) | |
915 | * under the assumption that its pm_domain field points to the domain member of | |
916 | * an object of type struct generic_pm_domain representing a PM domain | |
917 | * consisting of I/O devices. | |
918 | */ | |
919 | static int pm_genpd_prepare(struct device *dev) | |
920 | { | |
921 | struct generic_pm_domain *genpd; | |
b6c10c84 | 922 | int ret; |
596ba34b RW |
923 | |
924 | dev_dbg(dev, "%s()\n", __func__); | |
925 | ||
926 | genpd = dev_to_genpd(dev); | |
927 | if (IS_ERR(genpd)) | |
928 | return -EINVAL; | |
929 | ||
17b75eca RW |
930 | /* |
931 | * If a wakeup request is pending for the device, it should be woken up | |
932 | * at this point and a system wakeup event should be reported if it's | |
933 | * set up to wake up the system from sleep states. | |
934 | */ | |
935 | pm_runtime_get_noresume(dev); | |
936 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
937 | pm_wakeup_event(dev, 0); | |
938 | ||
939 | if (pm_wakeup_pending()) { | |
84167035 | 940 | pm_runtime_put(dev); |
17b75eca RW |
941 | return -EBUSY; |
942 | } | |
943 | ||
4ecd6e65 RW |
944 | if (resume_needed(dev, genpd)) |
945 | pm_runtime_resume(dev); | |
946 | ||
17b75eca | 947 | genpd_acquire_lock(genpd); |
596ba34b | 948 | |
65533bbf RW |
949 | if (genpd->prepared_count++ == 0) { |
950 | genpd->suspended_count = 0; | |
17b75eca | 951 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 952 | } |
17b75eca RW |
953 | |
954 | genpd_release_lock(genpd); | |
596ba34b RW |
955 | |
956 | if (genpd->suspend_power_off) { | |
17b75eca | 957 | pm_runtime_put_noidle(dev); |
596ba34b RW |
958 | return 0; |
959 | } | |
960 | ||
961 | /* | |
17b75eca RW |
962 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
963 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 964 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 965 | * to make it operational. |
596ba34b | 966 | */ |
17b75eca | 967 | pm_runtime_resume(dev); |
596ba34b RW |
968 | __pm_runtime_disable(dev, false); |
969 | ||
b6c10c84 RW |
970 | ret = pm_generic_prepare(dev); |
971 | if (ret) { | |
972 | mutex_lock(&genpd->lock); | |
973 | ||
974 | if (--genpd->prepared_count == 0) | |
975 | genpd->suspend_power_off = false; | |
976 | ||
977 | mutex_unlock(&genpd->lock); | |
17b75eca | 978 | pm_runtime_enable(dev); |
b6c10c84 | 979 | } |
17b75eca | 980 | |
84167035 | 981 | pm_runtime_put(dev); |
b6c10c84 | 982 | return ret; |
596ba34b RW |
983 | } |
984 | ||
985 | /** | |
986 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
987 | * @dev: Device to suspend. | |
988 | * | |
989 | * Suspend a device under the assumption that its pm_domain field points to the | |
990 | * domain member of an object of type struct generic_pm_domain representing | |
991 | * a PM domain consisting of I/O devices. | |
992 | */ | |
993 | static int pm_genpd_suspend(struct device *dev) | |
994 | { | |
995 | struct generic_pm_domain *genpd; | |
996 | ||
997 | dev_dbg(dev, "%s()\n", __func__); | |
998 | ||
999 | genpd = dev_to_genpd(dev); | |
1000 | if (IS_ERR(genpd)) | |
1001 | return -EINVAL; | |
1002 | ||
1e0407ca | 1003 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
1004 | } |
1005 | ||
1006 | /** | |
0496c8ae | 1007 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
1008 | * @dev: Device to suspend. |
1009 | * | |
1010 | * Carry out a late suspend of a device under the assumption that its | |
1011 | * pm_domain field points to the domain member of an object of type | |
1012 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
1013 | */ | |
0496c8ae | 1014 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
1015 | { |
1016 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1017 | |
1018 | dev_dbg(dev, "%s()\n", __func__); | |
1019 | ||
1020 | genpd = dev_to_genpd(dev); | |
1021 | if (IS_ERR(genpd)) | |
1022 | return -EINVAL; | |
1023 | ||
1e0407ca | 1024 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 1025 | } |
596ba34b | 1026 | |
0496c8ae RW |
1027 | /** |
1028 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
1029 | * @dev: Device to suspend. | |
1030 | * | |
1031 | * Stop the device and remove power from the domain if all devices in it have | |
1032 | * been stopped. | |
1033 | */ | |
1034 | static int pm_genpd_suspend_noirq(struct device *dev) | |
1035 | { | |
1036 | struct generic_pm_domain *genpd; | |
1037 | ||
1038 | dev_dbg(dev, "%s()\n", __func__); | |
1039 | ||
1040 | genpd = dev_to_genpd(dev); | |
1041 | if (IS_ERR(genpd)) | |
1042 | return -EINVAL; | |
596ba34b | 1043 | |
dbf37414 | 1044 | if (genpd->suspend_power_off |
0496c8ae | 1045 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1046 | return 0; |
1047 | ||
d5e4cbfe | 1048 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1049 | |
1050 | /* | |
1051 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1052 | * guaranteed that this function will never run twice in parallel for | |
1053 | * the same PM domain, so it is not necessary to use locking here. | |
1054 | */ | |
1055 | genpd->suspended_count++; | |
1056 | pm_genpd_sync_poweroff(genpd); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | /** | |
0496c8ae | 1062 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1063 | * @dev: Device to resume. |
1064 | * | |
0496c8ae | 1065 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1066 | */ |
1067 | static int pm_genpd_resume_noirq(struct device *dev) | |
1068 | { | |
1069 | struct generic_pm_domain *genpd; | |
1070 | ||
1071 | dev_dbg(dev, "%s()\n", __func__); | |
1072 | ||
1073 | genpd = dev_to_genpd(dev); | |
1074 | if (IS_ERR(genpd)) | |
1075 | return -EINVAL; | |
1076 | ||
dbf37414 | 1077 | if (genpd->suspend_power_off |
cc85b207 | 1078 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1079 | return 0; |
1080 | ||
1081 | /* | |
1082 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1083 | * guaranteed that this function will never run twice in parallel for | |
1084 | * the same PM domain, so it is not necessary to use locking here. | |
1085 | */ | |
802d8b49 | 1086 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1087 | genpd->suspended_count--; |
596ba34b | 1088 | |
0496c8ae | 1089 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1090 | } |
1091 | ||
1092 | /** | |
0496c8ae RW |
1093 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1094 | * @dev: Device to resume. | |
1095 | * | |
1096 | * Carry out an early resume of a device under the assumption that its | |
1097 | * pm_domain field points to the domain member of an object of type | |
1098 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1099 | * devices. | |
1100 | */ | |
1101 | static int pm_genpd_resume_early(struct device *dev) | |
1102 | { | |
1103 | struct generic_pm_domain *genpd; | |
1104 | ||
1105 | dev_dbg(dev, "%s()\n", __func__); | |
1106 | ||
1107 | genpd = dev_to_genpd(dev); | |
1108 | if (IS_ERR(genpd)) | |
1109 | return -EINVAL; | |
1110 | ||
1e0407ca | 1111 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1112 | } |
1113 | ||
1114 | /** | |
1115 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1116 | * @dev: Device to resume. |
1117 | * | |
1118 | * Resume a device under the assumption that its pm_domain field points to the | |
1119 | * domain member of an object of type struct generic_pm_domain representing | |
1120 | * a power domain consisting of I/O devices. | |
1121 | */ | |
1122 | static int pm_genpd_resume(struct device *dev) | |
1123 | { | |
1124 | struct generic_pm_domain *genpd; | |
1125 | ||
1126 | dev_dbg(dev, "%s()\n", __func__); | |
1127 | ||
1128 | genpd = dev_to_genpd(dev); | |
1129 | if (IS_ERR(genpd)) | |
1130 | return -EINVAL; | |
1131 | ||
1e0407ca | 1132 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1133 | } |
1134 | ||
1135 | /** | |
0496c8ae | 1136 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1137 | * @dev: Device to freeze. |
1138 | * | |
1139 | * Freeze a device under the assumption that its pm_domain field points to the | |
1140 | * domain member of an object of type struct generic_pm_domain representing | |
1141 | * a power domain consisting of I/O devices. | |
1142 | */ | |
1143 | static int pm_genpd_freeze(struct device *dev) | |
1144 | { | |
1145 | struct generic_pm_domain *genpd; | |
1146 | ||
1147 | dev_dbg(dev, "%s()\n", __func__); | |
1148 | ||
1149 | genpd = dev_to_genpd(dev); | |
1150 | if (IS_ERR(genpd)) | |
1151 | return -EINVAL; | |
1152 | ||
1e0407ca | 1153 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1154 | } |
1155 | ||
1156 | /** | |
0496c8ae RW |
1157 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1158 | * @dev: Device to freeze. | |
1159 | * | |
1160 | * Carry out a late freeze of a device under the assumption that its | |
1161 | * pm_domain field points to the domain member of an object of type | |
1162 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1163 | * devices. | |
1164 | */ | |
1165 | static int pm_genpd_freeze_late(struct device *dev) | |
1166 | { | |
1167 | struct generic_pm_domain *genpd; | |
1168 | ||
1169 | dev_dbg(dev, "%s()\n", __func__); | |
1170 | ||
1171 | genpd = dev_to_genpd(dev); | |
1172 | if (IS_ERR(genpd)) | |
1173 | return -EINVAL; | |
1174 | ||
1e0407ca | 1175 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
1176 | } |
1177 | ||
1178 | /** | |
1179 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1180 | * @dev: Device to freeze. |
1181 | * | |
1182 | * Carry out a late freeze of a device under the assumption that its | |
1183 | * pm_domain field points to the domain member of an object of type | |
1184 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1185 | * devices. | |
1186 | */ | |
1187 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1188 | { | |
1189 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1190 | |
1191 | dev_dbg(dev, "%s()\n", __func__); | |
1192 | ||
1193 | genpd = dev_to_genpd(dev); | |
1194 | if (IS_ERR(genpd)) | |
1195 | return -EINVAL; | |
1196 | ||
dbf37414 | 1197 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1198 | } |
596ba34b | 1199 | |
0496c8ae RW |
1200 | /** |
1201 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1202 | * @dev: Device to thaw. | |
1203 | * | |
1204 | * Start the device, unless power has been removed from the domain already | |
1205 | * before the system transition. | |
1206 | */ | |
1207 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1208 | { | |
1209 | struct generic_pm_domain *genpd; | |
596ba34b | 1210 | |
0496c8ae | 1211 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1212 | |
0496c8ae RW |
1213 | genpd = dev_to_genpd(dev); |
1214 | if (IS_ERR(genpd)) | |
1215 | return -EINVAL; | |
1216 | ||
dbf37414 | 1217 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1218 | } |
1219 | ||
1220 | /** | |
0496c8ae | 1221 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1222 | * @dev: Device to thaw. |
1223 | * | |
1224 | * Carry out an early thaw of a device under the assumption that its | |
1225 | * pm_domain field points to the domain member of an object of type | |
1226 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1227 | * devices. | |
1228 | */ | |
0496c8ae | 1229 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1230 | { |
1231 | struct generic_pm_domain *genpd; | |
1232 | ||
1233 | dev_dbg(dev, "%s()\n", __func__); | |
1234 | ||
1235 | genpd = dev_to_genpd(dev); | |
1236 | if (IS_ERR(genpd)) | |
1237 | return -EINVAL; | |
1238 | ||
1e0407ca | 1239 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1240 | } |
1241 | ||
1242 | /** | |
1243 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1244 | * @dev: Device to thaw. | |
1245 | * | |
1246 | * Thaw a device under the assumption that its pm_domain field points to the | |
1247 | * domain member of an object of type struct generic_pm_domain representing | |
1248 | * a power domain consisting of I/O devices. | |
1249 | */ | |
1250 | static int pm_genpd_thaw(struct device *dev) | |
1251 | { | |
1252 | struct generic_pm_domain *genpd; | |
1253 | ||
1254 | dev_dbg(dev, "%s()\n", __func__); | |
1255 | ||
1256 | genpd = dev_to_genpd(dev); | |
1257 | if (IS_ERR(genpd)) | |
1258 | return -EINVAL; | |
1259 | ||
1e0407ca | 1260 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1261 | } |
1262 | ||
1263 | /** | |
0496c8ae | 1264 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1265 | * @dev: Device to resume. |
1266 | * | |
0496c8ae RW |
1267 | * Make sure the domain will be in the same power state as before the |
1268 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1269 | */ |
1270 | static int pm_genpd_restore_noirq(struct device *dev) | |
1271 | { | |
1272 | struct generic_pm_domain *genpd; | |
1273 | ||
1274 | dev_dbg(dev, "%s()\n", __func__); | |
1275 | ||
1276 | genpd = dev_to_genpd(dev); | |
1277 | if (IS_ERR(genpd)) | |
1278 | return -EINVAL; | |
1279 | ||
1280 | /* | |
1281 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1282 | * guaranteed that this function will never run twice in parallel for | |
1283 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1284 | * |
1285 | * At this point suspended_count == 0 means we are being run for the | |
1286 | * first time for the given domain in the present cycle. | |
596ba34b | 1287 | */ |
65533bbf | 1288 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1289 | /* |
65533bbf | 1290 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1291 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1292 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1293 | */ |
65533bbf RW |
1294 | genpd->status = GPD_STATE_POWER_OFF; |
1295 | if (genpd->suspend_power_off) { | |
1296 | /* | |
1297 | * If the domain was off before the hibernation, make | |
1298 | * sure it will be off going forward. | |
1299 | */ | |
c8f0ea45 | 1300 | genpd_power_off(genpd); |
65533bbf RW |
1301 | |
1302 | return 0; | |
1303 | } | |
596ba34b RW |
1304 | } |
1305 | ||
18dd2ece RW |
1306 | if (genpd->suspend_power_off) |
1307 | return 0; | |
1308 | ||
802d8b49 | 1309 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1310 | |
dbf37414 | 1311 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1312 | } |
1313 | ||
1314 | /** | |
1315 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1316 | * @dev: Device to complete the transition of. | |
1317 | * | |
1318 | * Complete a power transition of a device (during a system-wide power | |
1319 | * transition) under the assumption that its pm_domain field points to the | |
1320 | * domain member of an object of type struct generic_pm_domain representing | |
1321 | * a power domain consisting of I/O devices. | |
1322 | */ | |
1323 | static void pm_genpd_complete(struct device *dev) | |
1324 | { | |
1325 | struct generic_pm_domain *genpd; | |
1326 | bool run_complete; | |
1327 | ||
1328 | dev_dbg(dev, "%s()\n", __func__); | |
1329 | ||
1330 | genpd = dev_to_genpd(dev); | |
1331 | if (IS_ERR(genpd)) | |
1332 | return; | |
1333 | ||
1334 | mutex_lock(&genpd->lock); | |
1335 | ||
1336 | run_complete = !genpd->suspend_power_off; | |
1337 | if (--genpd->prepared_count == 0) | |
1338 | genpd->suspend_power_off = false; | |
1339 | ||
1340 | mutex_unlock(&genpd->lock); | |
1341 | ||
1342 | if (run_complete) { | |
1343 | pm_generic_complete(dev); | |
6f00ff78 | 1344 | pm_runtime_set_active(dev); |
596ba34b | 1345 | pm_runtime_enable(dev); |
af939339 | 1346 | pm_request_idle(dev); |
596ba34b RW |
1347 | } |
1348 | } | |
1349 | ||
77f827de | 1350 | /** |
d47e6464 | 1351 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1352 | * @dev: Device that normally is marked as "always on" to switch power for. |
1353 | * | |
1354 | * This routine may only be called during the system core (syscore) suspend or | |
1355 | * resume phase for devices whose "always on" flags are set. | |
1356 | */ | |
d47e6464 | 1357 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1358 | { |
1359 | struct generic_pm_domain *genpd; | |
1360 | ||
1361 | genpd = dev_to_genpd(dev); | |
1362 | if (!pm_genpd_present(genpd)) | |
1363 | return; | |
1364 | ||
1365 | if (suspend) { | |
1366 | genpd->suspended_count++; | |
1367 | pm_genpd_sync_poweroff(genpd); | |
1368 | } else { | |
1369 | pm_genpd_sync_poweron(genpd); | |
1370 | genpd->suspended_count--; | |
1371 | } | |
1372 | } | |
d47e6464 UH |
1373 | |
1374 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1375 | { | |
1376 | genpd_syscore_switch(dev, true); | |
1377 | } | |
1378 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1379 | ||
1380 | void pm_genpd_syscore_poweron(struct device *dev) | |
1381 | { | |
1382 | genpd_syscore_switch(dev, false); | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1385 | |
596ba34b RW |
1386 | #else |
1387 | ||
1388 | #define pm_genpd_prepare NULL | |
1389 | #define pm_genpd_suspend NULL | |
0496c8ae | 1390 | #define pm_genpd_suspend_late NULL |
596ba34b | 1391 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1392 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1393 | #define pm_genpd_resume_noirq NULL |
1394 | #define pm_genpd_resume NULL | |
1395 | #define pm_genpd_freeze NULL | |
0496c8ae | 1396 | #define pm_genpd_freeze_late NULL |
596ba34b | 1397 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1398 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1399 | #define pm_genpd_thaw_noirq NULL |
1400 | #define pm_genpd_thaw NULL | |
596ba34b | 1401 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1402 | #define pm_genpd_complete NULL |
1403 | ||
1404 | #endif /* CONFIG_PM_SLEEP */ | |
1405 | ||
1d5fcfec RW |
1406 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1407 | { | |
1408 | struct generic_pm_domain_data *gpd_data; | |
1409 | ||
1410 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1411 | if (!gpd_data) | |
1412 | return NULL; | |
1413 | ||
1414 | mutex_init(&gpd_data->lock); | |
1415 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1416 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1417 | return gpd_data; | |
1418 | } | |
1419 | ||
1420 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1421 | struct generic_pm_domain_data *gpd_data) | |
1422 | { | |
1423 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1424 | kfree(gpd_data); | |
1425 | } | |
1426 | ||
f721889f | 1427 | /** |
b02c999a | 1428 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1429 | * @genpd: PM domain to add the device to. |
1430 | * @dev: Device to be added. | |
b02c999a | 1431 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1432 | */ |
b02c999a RW |
1433 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1434 | struct gpd_timing_data *td) | |
f721889f | 1435 | { |
1d5fcfec | 1436 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1437 | struct pm_domain_data *pdd; |
f721889f RW |
1438 | int ret = 0; |
1439 | ||
1440 | dev_dbg(dev, "%s()\n", __func__); | |
1441 | ||
1442 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1443 | return -EINVAL; | |
1444 | ||
1d5fcfec RW |
1445 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1446 | if (!gpd_data_new) | |
6ff7bb0d RW |
1447 | return -ENOMEM; |
1448 | ||
17b75eca | 1449 | genpd_acquire_lock(genpd); |
f721889f | 1450 | |
596ba34b RW |
1451 | if (genpd->prepared_count > 0) { |
1452 | ret = -EAGAIN; | |
1453 | goto out; | |
1454 | } | |
1455 | ||
4605ab65 RW |
1456 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1457 | if (pdd->dev == dev) { | |
f721889f RW |
1458 | ret = -EINVAL; |
1459 | goto out; | |
1460 | } | |
1461 | ||
1d5fcfec RW |
1462 | ret = dev_pm_get_subsys_data(dev); |
1463 | if (ret) | |
1464 | goto out; | |
1465 | ||
596ba34b | 1466 | genpd->device_count++; |
6ff7bb0d | 1467 | genpd->max_off_time_changed = true; |
f721889f | 1468 | |
6ff7bb0d | 1469 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1470 | |
6ff7bb0d | 1471 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1472 | if (dev->power.subsys_data->domain_data) { |
1473 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1474 | } else { | |
1475 | gpd_data = gpd_data_new; | |
1476 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1477 | } | |
1478 | gpd_data->refcount++; | |
b02c999a RW |
1479 | if (td) |
1480 | gpd_data->td = *td; | |
f721889f | 1481 | |
1d5fcfec RW |
1482 | spin_unlock_irq(&dev->power.lock); |
1483 | ||
d79b6fe1 | 1484 | if (genpd->attach_dev) |
c16561e8 | 1485 | genpd->attach_dev(genpd, dev); |
d79b6fe1 | 1486 | |
1d5fcfec RW |
1487 | mutex_lock(&gpd_data->lock); |
1488 | gpd_data->base.dev = dev; | |
1489 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
67732cd3 | 1490 | gpd_data->need_restore = -1; |
6ff7bb0d RW |
1491 | gpd_data->td.constraint_changed = true; |
1492 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1493 | mutex_unlock(&gpd_data->lock); |
1494 | ||
f721889f | 1495 | out: |
17b75eca | 1496 | genpd_release_lock(genpd); |
f721889f | 1497 | |
1d5fcfec RW |
1498 | if (gpd_data != gpd_data_new) |
1499 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1500 | ||
f721889f RW |
1501 | return ret; |
1502 | } | |
1503 | ||
b5abb085 RW |
1504 | /** |
1505 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1506 | * @domain_name: Name of the PM domain to add the device to. | |
1507 | * @dev: Device to be added. | |
1508 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1509 | */ | |
1510 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1511 | struct gpd_timing_data *td) | |
1512 | { | |
8bc0251d | 1513 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1514 | } |
1515 | ||
f721889f RW |
1516 | /** |
1517 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1518 | * @genpd: PM domain to remove the device from. | |
1519 | * @dev: Device to be removed. | |
1520 | */ | |
1521 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1522 | struct device *dev) | |
1523 | { | |
6ff7bb0d | 1524 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1525 | struct pm_domain_data *pdd; |
1d5fcfec | 1526 | bool remove = false; |
efa69025 | 1527 | int ret = 0; |
f721889f RW |
1528 | |
1529 | dev_dbg(dev, "%s()\n", __func__); | |
1530 | ||
efa69025 RW |
1531 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1532 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1533 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1534 | return -EINVAL; |
1535 | ||
17b75eca | 1536 | genpd_acquire_lock(genpd); |
f721889f | 1537 | |
596ba34b RW |
1538 | if (genpd->prepared_count > 0) { |
1539 | ret = -EAGAIN; | |
1540 | goto out; | |
1541 | } | |
1542 | ||
6ff7bb0d RW |
1543 | genpd->device_count--; |
1544 | genpd->max_off_time_changed = true; | |
1545 | ||
d79b6fe1 | 1546 | if (genpd->detach_dev) |
c16561e8 | 1547 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1548 | |
6ff7bb0d | 1549 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1550 | |
efa69025 RW |
1551 | dev->pm_domain = NULL; |
1552 | pdd = dev->power.subsys_data->domain_data; | |
1553 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1554 | gpd_data = to_gpd_data(pdd); |
1555 | if (--gpd_data->refcount == 0) { | |
1556 | dev->power.subsys_data->domain_data = NULL; | |
1557 | remove = true; | |
1558 | } | |
1559 | ||
6ff7bb0d | 1560 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1561 | |
6ff7bb0d RW |
1562 | mutex_lock(&gpd_data->lock); |
1563 | pdd->dev = NULL; | |
1564 | mutex_unlock(&gpd_data->lock); | |
1565 | ||
1566 | genpd_release_lock(genpd); | |
1567 | ||
6ff7bb0d | 1568 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1569 | if (remove) |
1570 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1571 | ||
6ff7bb0d | 1572 | return 0; |
f721889f | 1573 | |
596ba34b | 1574 | out: |
17b75eca | 1575 | genpd_release_lock(genpd); |
f721889f RW |
1576 | |
1577 | return ret; | |
1578 | } | |
1579 | ||
ca1d72f0 RW |
1580 | /** |
1581 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1582 | * @dev: Device to set/unset the flag for. | |
1583 | * @val: The new value of the device's "need restore" flag. | |
1584 | */ | |
1585 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1586 | { | |
1587 | struct pm_subsys_data *psd; | |
1588 | unsigned long flags; | |
1589 | ||
1590 | spin_lock_irqsave(&dev->power.lock, flags); | |
1591 | ||
1592 | psd = dev_to_psd(dev); | |
1593 | if (psd && psd->domain_data) | |
67732cd3 | 1594 | to_gpd_data(psd->domain_data)->need_restore = val ? 1 : 0; |
ca1d72f0 RW |
1595 | |
1596 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1597 | } | |
1598 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1599 | ||
f721889f RW |
1600 | /** |
1601 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1602 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1603 | * @subdomain: Subdomain to be added. |
f721889f RW |
1604 | */ |
1605 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1606 | struct generic_pm_domain *subdomain) |
f721889f | 1607 | { |
5063ce15 | 1608 | struct gpd_link *link; |
f721889f RW |
1609 | int ret = 0; |
1610 | ||
fb7268be RW |
1611 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1612 | || genpd == subdomain) | |
f721889f RW |
1613 | return -EINVAL; |
1614 | ||
17b75eca RW |
1615 | start: |
1616 | genpd_acquire_lock(genpd); | |
bc0403ff | 1617 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1618 | |
bc0403ff RW |
1619 | if (subdomain->status != GPD_STATE_POWER_OFF |
1620 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1621 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1622 | genpd_release_lock(genpd); |
1623 | goto start; | |
1624 | } | |
1625 | ||
1626 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1627 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1628 | ret = -EINVAL; |
1629 | goto out; | |
1630 | } | |
1631 | ||
4fcac10d | 1632 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1633 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1634 | ret = -EINVAL; |
1635 | goto out; | |
1636 | } | |
1637 | } | |
1638 | ||
5063ce15 RW |
1639 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1640 | if (!link) { | |
1641 | ret = -ENOMEM; | |
1642 | goto out; | |
1643 | } | |
1644 | link->master = genpd; | |
1645 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1646 | link->slave = subdomain; |
1647 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1648 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1649 | genpd_sd_counter_inc(genpd); |
f721889f | 1650 | |
f721889f | 1651 | out: |
bc0403ff | 1652 | mutex_unlock(&subdomain->lock); |
17b75eca | 1653 | genpd_release_lock(genpd); |
f721889f RW |
1654 | |
1655 | return ret; | |
1656 | } | |
1657 | ||
fb7268be RW |
1658 | /** |
1659 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1660 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1661 | * @subdomain_name: Name of the subdomain to be added. | |
1662 | */ | |
1663 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1664 | const char *subdomain_name) | |
1665 | { | |
1666 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1667 | ||
1668 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1669 | return -EINVAL; | |
1670 | ||
1671 | mutex_lock(&gpd_list_lock); | |
1672 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1673 | if (!master && !strcmp(gpd->name, master_name)) | |
1674 | master = gpd; | |
1675 | ||
1676 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1677 | subdomain = gpd; | |
1678 | ||
1679 | if (master && subdomain) | |
1680 | break; | |
1681 | } | |
1682 | mutex_unlock(&gpd_list_lock); | |
1683 | ||
1684 | return pm_genpd_add_subdomain(master, subdomain); | |
1685 | } | |
1686 | ||
f721889f RW |
1687 | /** |
1688 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1689 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1690 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1691 | */ |
1692 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1693 | struct generic_pm_domain *subdomain) |
f721889f | 1694 | { |
5063ce15 | 1695 | struct gpd_link *link; |
f721889f RW |
1696 | int ret = -EINVAL; |
1697 | ||
5063ce15 | 1698 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1699 | return -EINVAL; |
1700 | ||
17b75eca RW |
1701 | start: |
1702 | genpd_acquire_lock(genpd); | |
f721889f | 1703 | |
5063ce15 RW |
1704 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1705 | if (link->slave != subdomain) | |
f721889f RW |
1706 | continue; |
1707 | ||
1708 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1709 | ||
17b75eca RW |
1710 | if (subdomain->status != GPD_STATE_POWER_OFF |
1711 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1712 | mutex_unlock(&subdomain->lock); | |
1713 | genpd_release_lock(genpd); | |
1714 | goto start; | |
1715 | } | |
1716 | ||
5063ce15 RW |
1717 | list_del(&link->master_node); |
1718 | list_del(&link->slave_node); | |
1719 | kfree(link); | |
17b75eca | 1720 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1721 | genpd_sd_counter_dec(genpd); |
1722 | ||
1723 | mutex_unlock(&subdomain->lock); | |
1724 | ||
1725 | ret = 0; | |
1726 | break; | |
1727 | } | |
1728 | ||
17b75eca | 1729 | genpd_release_lock(genpd); |
f721889f RW |
1730 | |
1731 | return ret; | |
1732 | } | |
1733 | ||
40114447 RW |
1734 | /** |
1735 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1736 | * @genpd: PM domain to be connected with cpuidle. | |
1737 | * @state: cpuidle state this domain can disable/enable. | |
1738 | * | |
1739 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1740 | * of calling its power down routine it will enable the given cpuidle state so | |
1741 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1742 | */ | |
1743 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1744 | { |
1745 | struct cpuidle_driver *cpuidle_drv; | |
f39cb179 | 1746 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1747 | struct cpuidle_state *idle_state; |
1748 | int ret = 0; | |
1749 | ||
1750 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1751 | return -EINVAL; | |
1752 | ||
1753 | genpd_acquire_lock(genpd); | |
1754 | ||
f39cb179 | 1755 | if (genpd->cpuidle_data) { |
cbc9ef02 RW |
1756 | ret = -EEXIST; |
1757 | goto out; | |
1758 | } | |
f39cb179 UH |
1759 | cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); |
1760 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1761 | ret = -ENOMEM; |
1762 | goto out; | |
1763 | } | |
1764 | cpuidle_drv = cpuidle_driver_ref(); | |
1765 | if (!cpuidle_drv) { | |
1766 | ret = -ENODEV; | |
debe081a | 1767 | goto err_drv; |
cbc9ef02 RW |
1768 | } |
1769 | if (cpuidle_drv->state_count <= state) { | |
1770 | ret = -EINVAL; | |
1771 | goto err; | |
1772 | } | |
1773 | idle_state = &cpuidle_drv->states[state]; | |
1774 | if (!idle_state->disabled) { | |
1775 | ret = -EAGAIN; | |
1776 | goto err; | |
1777 | } | |
f39cb179 UH |
1778 | cpuidle_data->idle_state = idle_state; |
1779 | cpuidle_data->saved_exit_latency = idle_state->exit_latency; | |
1780 | genpd->cpuidle_data = cpuidle_data; | |
cbc9ef02 RW |
1781 | genpd_recalc_cpu_exit_latency(genpd); |
1782 | ||
1783 | out: | |
1784 | genpd_release_lock(genpd); | |
1785 | return ret; | |
1786 | ||
1787 | err: | |
1788 | cpuidle_driver_unref(); | |
debe081a | 1789 | |
1790 | err_drv: | |
f39cb179 | 1791 | kfree(cpuidle_data); |
cbc9ef02 RW |
1792 | goto out; |
1793 | } | |
1794 | ||
74a2799a RW |
1795 | /** |
1796 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1797 | * @name: Name of the domain to connect to cpuidle. | |
1798 | * @state: cpuidle state this domain can manipulate. | |
1799 | */ | |
1800 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1801 | { | |
1802 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1803 | } | |
1804 | ||
40114447 RW |
1805 | /** |
1806 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1807 | * @genpd: PM domain to remove the cpuidle connection from. | |
1808 | * | |
1809 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1810 | * given PM domain. | |
1811 | */ | |
1812 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 | 1813 | { |
f39cb179 | 1814 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1815 | struct cpuidle_state *idle_state; |
1816 | int ret = 0; | |
1817 | ||
1818 | if (IS_ERR_OR_NULL(genpd)) | |
1819 | return -EINVAL; | |
1820 | ||
1821 | genpd_acquire_lock(genpd); | |
1822 | ||
f39cb179 UH |
1823 | cpuidle_data = genpd->cpuidle_data; |
1824 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1825 | ret = -ENODEV; |
1826 | goto out; | |
1827 | } | |
f39cb179 | 1828 | idle_state = cpuidle_data->idle_state; |
cbc9ef02 RW |
1829 | if (!idle_state->disabled) { |
1830 | ret = -EAGAIN; | |
1831 | goto out; | |
1832 | } | |
f39cb179 | 1833 | idle_state->exit_latency = cpuidle_data->saved_exit_latency; |
cbc9ef02 | 1834 | cpuidle_driver_unref(); |
f39cb179 UH |
1835 | genpd->cpuidle_data = NULL; |
1836 | kfree(cpuidle_data); | |
cbc9ef02 RW |
1837 | |
1838 | out: | |
1839 | genpd_release_lock(genpd); | |
1840 | return ret; | |
1841 | } | |
1842 | ||
74a2799a RW |
1843 | /** |
1844 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1845 | * @name: Name of the domain to disconnect cpuidle from. | |
1846 | */ | |
1847 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1848 | { | |
1849 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1850 | } | |
1851 | ||
d23b9b00 RW |
1852 | /* Default device callbacks for generic PM domains. */ |
1853 | ||
ecf00475 | 1854 | /** |
12e10bb6 | 1855 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1856 | * @dev: Device to handle. |
1857 | */ | |
1858 | static int pm_genpd_default_save_state(struct device *dev) | |
1859 | { | |
1860 | int (*cb)(struct device *__dev); | |
ecf00475 | 1861 | |
0b589741 RW |
1862 | if (dev->type && dev->type->pm) |
1863 | cb = dev->type->pm->runtime_suspend; | |
1864 | else if (dev->class && dev->class->pm) | |
1865 | cb = dev->class->pm->runtime_suspend; | |
1866 | else if (dev->bus && dev->bus->pm) | |
1867 | cb = dev->bus->pm->runtime_suspend; | |
1868 | else | |
1869 | cb = NULL; | |
ecf00475 | 1870 | |
0b589741 RW |
1871 | if (!cb && dev->driver && dev->driver->pm) |
1872 | cb = dev->driver->pm->runtime_suspend; | |
1873 | ||
1874 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1875 | } |
1876 | ||
1877 | /** | |
12e10bb6 | 1878 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1879 | * @dev: Device to handle. |
1880 | */ | |
1881 | static int pm_genpd_default_restore_state(struct device *dev) | |
1882 | { | |
1883 | int (*cb)(struct device *__dev); | |
ecf00475 | 1884 | |
0b589741 RW |
1885 | if (dev->type && dev->type->pm) |
1886 | cb = dev->type->pm->runtime_resume; | |
1887 | else if (dev->class && dev->class->pm) | |
1888 | cb = dev->class->pm->runtime_resume; | |
1889 | else if (dev->bus && dev->bus->pm) | |
1890 | cb = dev->bus->pm->runtime_resume; | |
1891 | else | |
1892 | cb = NULL; | |
ecf00475 | 1893 | |
0b589741 RW |
1894 | if (!cb && dev->driver && dev->driver->pm) |
1895 | cb = dev->driver->pm->runtime_resume; | |
1896 | ||
1897 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1898 | } |
1899 | ||
f721889f RW |
1900 | /** |
1901 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1902 | * @genpd: PM domain object to initialize. | |
1903 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1904 | * @is_off: Initial value of the domain's power_is_off field. | |
1905 | */ | |
1906 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1907 | struct dev_power_governor *gov, bool is_off) | |
1908 | { | |
1909 | if (IS_ERR_OR_NULL(genpd)) | |
1910 | return; | |
1911 | ||
5063ce15 RW |
1912 | INIT_LIST_HEAD(&genpd->master_links); |
1913 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1914 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1915 | mutex_init(&genpd->lock); |
1916 | genpd->gov = gov; | |
1917 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1918 | genpd->in_progress = 0; | |
c4bb3160 | 1919 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1920 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1921 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1922 | genpd->poweroff_task = NULL; |
1923 | genpd->resume_count = 0; | |
596ba34b | 1924 | genpd->device_count = 0; |
221e9b58 | 1925 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1926 | genpd->max_off_time_changed = true; |
f721889f RW |
1927 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1928 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1929 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1930 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1931 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1932 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1933 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1934 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1935 | genpd->domain.ops.resume = pm_genpd_resume; |
1936 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1937 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1938 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1939 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1940 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1941 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1942 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1943 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1944 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1945 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1946 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1947 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1948 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1949 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1950 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
5125bbf3 RW |
1951 | mutex_lock(&gpd_list_lock); |
1952 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1953 | mutex_unlock(&gpd_list_lock); | |
1954 | } | |
aa42240a TF |
1955 | |
1956 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1957 | /* | |
1958 | * Device Tree based PM domain providers. | |
1959 | * | |
1960 | * The code below implements generic device tree based PM domain providers that | |
1961 | * bind device tree nodes with generic PM domains registered in the system. | |
1962 | * | |
1963 | * Any driver that registers generic PM domains and needs to support binding of | |
1964 | * devices to these domains is supposed to register a PM domain provider, which | |
1965 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1966 | * | |
1967 | * Two simple mapping functions have been provided for convenience: | |
1968 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1969 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1970 | * index. | |
1971 | */ | |
1972 | ||
1973 | /** | |
1974 | * struct of_genpd_provider - PM domain provider registration structure | |
1975 | * @link: Entry in global list of PM domain providers | |
1976 | * @node: Pointer to device tree node of PM domain provider | |
1977 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1978 | * into a PM domain. | |
1979 | * @data: context pointer to be passed into @xlate callback | |
1980 | */ | |
1981 | struct of_genpd_provider { | |
1982 | struct list_head link; | |
1983 | struct device_node *node; | |
1984 | genpd_xlate_t xlate; | |
1985 | void *data; | |
1986 | }; | |
1987 | ||
1988 | /* List of registered PM domain providers. */ | |
1989 | static LIST_HEAD(of_genpd_providers); | |
1990 | /* Mutex to protect the list above. */ | |
1991 | static DEFINE_MUTEX(of_genpd_mutex); | |
1992 | ||
1993 | /** | |
1994 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1995 | * @genpdspec: OF phandle args to map into a PM domain | |
1996 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1997 | * | |
1998 | * This is a generic xlate function that can be used to model PM domains that | |
1999 | * have their own device tree nodes. The private data of xlate function needs | |
2000 | * to be a valid pointer to struct generic_pm_domain. | |
2001 | */ | |
2002 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
2003 | struct of_phandle_args *genpdspec, | |
2004 | void *data) | |
2005 | { | |
2006 | if (genpdspec->args_count != 0) | |
2007 | return ERR_PTR(-EINVAL); | |
2008 | return data; | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
2011 | ||
2012 | /** | |
2013 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
2014 | * @genpdspec: OF phandle args to map into a PM domain | |
2015 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2016 | * | |
2017 | * This is a generic xlate function that can be used to model simple PM domain | |
2018 | * controllers that have one device tree node and provide multiple PM domains. | |
2019 | * A single cell is used as an index into an array of PM domains specified in | |
2020 | * the genpd_onecell_data struct when registering the provider. | |
2021 | */ | |
2022 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
2023 | struct of_phandle_args *genpdspec, | |
2024 | void *data) | |
2025 | { | |
2026 | struct genpd_onecell_data *genpd_data = data; | |
2027 | unsigned int idx = genpdspec->args[0]; | |
2028 | ||
2029 | if (genpdspec->args_count != 1) | |
2030 | return ERR_PTR(-EINVAL); | |
2031 | ||
2032 | if (idx >= genpd_data->num_domains) { | |
2033 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2034 | return ERR_PTR(-EINVAL); | |
2035 | } | |
2036 | ||
2037 | if (!genpd_data->domains[idx]) | |
2038 | return ERR_PTR(-ENOENT); | |
2039 | ||
2040 | return genpd_data->domains[idx]; | |
2041 | } | |
2042 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
2043 | ||
2044 | /** | |
2045 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
2046 | * @np: Device node pointer associated with the PM domain provider. | |
2047 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2048 | * @data: Context pointer for @xlate callback. | |
2049 | */ | |
2050 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
2051 | void *data) | |
2052 | { | |
2053 | struct of_genpd_provider *cp; | |
2054 | ||
2055 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2056 | if (!cp) | |
2057 | return -ENOMEM; | |
2058 | ||
2059 | cp->node = of_node_get(np); | |
2060 | cp->data = data; | |
2061 | cp->xlate = xlate; | |
2062 | ||
2063 | mutex_lock(&of_genpd_mutex); | |
2064 | list_add(&cp->link, &of_genpd_providers); | |
2065 | mutex_unlock(&of_genpd_mutex); | |
2066 | pr_debug("Added domain provider from %s\n", np->full_name); | |
2067 | ||
2068 | return 0; | |
2069 | } | |
2070 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
2071 | ||
2072 | /** | |
2073 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2074 | * @np: Device node pointer associated with the PM domain provider | |
2075 | */ | |
2076 | void of_genpd_del_provider(struct device_node *np) | |
2077 | { | |
2078 | struct of_genpd_provider *cp; | |
2079 | ||
2080 | mutex_lock(&of_genpd_mutex); | |
2081 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
2082 | if (cp->node == np) { | |
2083 | list_del(&cp->link); | |
2084 | of_node_put(cp->node); | |
2085 | kfree(cp); | |
2086 | break; | |
2087 | } | |
2088 | } | |
2089 | mutex_unlock(&of_genpd_mutex); | |
2090 | } | |
2091 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2092 | ||
2093 | /** | |
2094 | * of_genpd_get_from_provider() - Look-up PM domain | |
2095 | * @genpdspec: OF phandle args to use for look-up | |
2096 | * | |
2097 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2098 | * found, uses xlate function of the provider to map phandle args to a PM | |
2099 | * domain. | |
2100 | * | |
2101 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2102 | * on failure. | |
2103 | */ | |
2104 | static struct generic_pm_domain *of_genpd_get_from_provider( | |
2105 | struct of_phandle_args *genpdspec) | |
2106 | { | |
2107 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2108 | struct of_genpd_provider *provider; | |
2109 | ||
2110 | mutex_lock(&of_genpd_mutex); | |
2111 | ||
2112 | /* Check if we have such a provider in our array */ | |
2113 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2114 | if (provider->node == genpdspec->np) | |
2115 | genpd = provider->xlate(genpdspec, provider->data); | |
2116 | if (!IS_ERR(genpd)) | |
2117 | break; | |
2118 | } | |
2119 | ||
2120 | mutex_unlock(&of_genpd_mutex); | |
2121 | ||
2122 | return genpd; | |
2123 | } | |
2124 | ||
2125 | /** | |
2126 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
2127 | * @dev: Device to attach. | |
2128 | * @power_off: Currently not used | |
2129 | * | |
2130 | * Try to locate a corresponding generic PM domain, which the device was | |
2131 | * attached to previously. If such is found, the device is detached from it. | |
2132 | */ | |
2133 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2134 | { | |
2135 | struct generic_pm_domain *pd = NULL, *gpd; | |
2136 | int ret = 0; | |
2137 | ||
2138 | if (!dev->pm_domain) | |
2139 | return; | |
2140 | ||
2141 | mutex_lock(&gpd_list_lock); | |
2142 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2143 | if (&gpd->domain == dev->pm_domain) { | |
2144 | pd = gpd; | |
2145 | break; | |
2146 | } | |
2147 | } | |
2148 | mutex_unlock(&gpd_list_lock); | |
2149 | ||
2150 | if (!pd) | |
2151 | return; | |
2152 | ||
2153 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2154 | ||
2155 | while (1) { | |
2156 | ret = pm_genpd_remove_device(pd, dev); | |
2157 | if (ret != -EAGAIN) | |
2158 | break; | |
2159 | cond_resched(); | |
2160 | } | |
2161 | ||
2162 | if (ret < 0) { | |
2163 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2164 | pd->name, ret); | |
2165 | return; | |
2166 | } | |
2167 | ||
2168 | /* Check if PM domain can be powered off after removing this device. */ | |
2169 | genpd_queue_power_off_work(pd); | |
2170 | } | |
2171 | ||
2172 | /** | |
2173 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2174 | * @dev: Device to attach. | |
2175 | * | |
2176 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2177 | * attaches the device to retrieved pm_domain ops. | |
2178 | * | |
2179 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2180 | * backwards compatibility with existing DTBs. | |
2181 | * | |
2182 | * Returns 0 on successfully attached PM domain or negative error code. | |
2183 | */ | |
2184 | int genpd_dev_pm_attach(struct device *dev) | |
2185 | { | |
2186 | struct of_phandle_args pd_args; | |
2187 | struct generic_pm_domain *pd; | |
2188 | int ret; | |
2189 | ||
2190 | if (!dev->of_node) | |
2191 | return -ENODEV; | |
2192 | ||
2193 | if (dev->pm_domain) | |
2194 | return -EEXIST; | |
2195 | ||
2196 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2197 | "#power-domain-cells", 0, &pd_args); | |
2198 | if (ret < 0) { | |
2199 | if (ret != -ENOENT) | |
2200 | return ret; | |
2201 | ||
2202 | /* | |
2203 | * Try legacy Samsung-specific bindings | |
2204 | * (for backwards compatibility of DT ABI) | |
2205 | */ | |
2206 | pd_args.args_count = 0; | |
2207 | pd_args.np = of_parse_phandle(dev->of_node, | |
2208 | "samsung,power-domain", 0); | |
2209 | if (!pd_args.np) | |
2210 | return -ENOENT; | |
2211 | } | |
2212 | ||
2213 | pd = of_genpd_get_from_provider(&pd_args); | |
2214 | if (IS_ERR(pd)) { | |
2215 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
2216 | __func__, PTR_ERR(pd)); | |
2217 | of_node_put(dev->of_node); | |
2218 | return PTR_ERR(pd); | |
2219 | } | |
2220 | ||
2221 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2222 | ||
2223 | while (1) { | |
2224 | ret = pm_genpd_add_device(pd, dev); | |
2225 | if (ret != -EAGAIN) | |
2226 | break; | |
2227 | cond_resched(); | |
2228 | } | |
2229 | ||
2230 | if (ret < 0) { | |
2231 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2232 | pd->name, ret); | |
2233 | of_node_put(dev->of_node); | |
2234 | return ret; | |
2235 | } | |
2236 | ||
2237 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
2ed12769 | 2238 | pm_genpd_poweron(pd); |
aa42240a TF |
2239 | |
2240 | return 0; | |
2241 | } | |
2242 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
2243 | #endif | |
2bd5306a MM |
2244 | |
2245 | ||
2246 | /*** debugfs support ***/ | |
2247 | ||
2248 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2249 | #include <linux/pm.h> | |
2250 | #include <linux/device.h> | |
2251 | #include <linux/debugfs.h> | |
2252 | #include <linux/seq_file.h> | |
2253 | #include <linux/init.h> | |
2254 | #include <linux/kobject.h> | |
2255 | static struct dentry *pm_genpd_debugfs_dir; | |
2256 | ||
2257 | /* | |
2258 | * TODO: This function is a slightly modified version of rtpm_status_show | |
2259 | * from sysfs.c, but dependencies between PM_GENERIC_DOMAINS and PM_RUNTIME | |
2260 | * are too loose to generalize it. | |
2261 | */ | |
2262 | #ifdef CONFIG_PM_RUNTIME | |
2263 | static void rtpm_status_str(struct seq_file *s, struct device *dev) | |
2264 | { | |
2265 | static const char * const status_lookup[] = { | |
2266 | [RPM_ACTIVE] = "active", | |
2267 | [RPM_RESUMING] = "resuming", | |
2268 | [RPM_SUSPENDED] = "suspended", | |
2269 | [RPM_SUSPENDING] = "suspending" | |
2270 | }; | |
2271 | const char *p = ""; | |
2272 | ||
2273 | if (dev->power.runtime_error) | |
2274 | p = "error"; | |
2275 | else if (dev->power.disable_depth) | |
2276 | p = "unsupported"; | |
2277 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2278 | p = status_lookup[dev->power.runtime_status]; | |
2279 | else | |
2280 | WARN_ON(1); | |
2281 | ||
2282 | seq_puts(s, p); | |
2283 | } | |
2284 | #else | |
2285 | static void rtpm_status_str(struct seq_file *s, struct device *dev) | |
2286 | { | |
2287 | seq_puts(s, "active"); | |
2288 | } | |
2289 | #endif | |
2290 | ||
2291 | static int pm_genpd_summary_one(struct seq_file *s, | |
2292 | struct generic_pm_domain *gpd) | |
2293 | { | |
2294 | static const char * const status_lookup[] = { | |
2295 | [GPD_STATE_ACTIVE] = "on", | |
2296 | [GPD_STATE_WAIT_MASTER] = "wait-master", | |
2297 | [GPD_STATE_BUSY] = "busy", | |
2298 | [GPD_STATE_REPEAT] = "off-in-progress", | |
2299 | [GPD_STATE_POWER_OFF] = "off" | |
2300 | }; | |
2301 | struct pm_domain_data *pm_data; | |
2302 | const char *kobj_path; | |
2303 | struct gpd_link *link; | |
2304 | int ret; | |
2305 | ||
2306 | ret = mutex_lock_interruptible(&gpd->lock); | |
2307 | if (ret) | |
2308 | return -ERESTARTSYS; | |
2309 | ||
2310 | if (WARN_ON(gpd->status >= ARRAY_SIZE(status_lookup))) | |
2311 | goto exit; | |
2312 | seq_printf(s, "%-30s %-15s ", gpd->name, status_lookup[gpd->status]); | |
2313 | ||
2314 | /* | |
2315 | * Modifications on the list require holding locks on both | |
2316 | * master and slave, so we are safe. | |
2317 | * Also gpd->name is immutable. | |
2318 | */ | |
2319 | list_for_each_entry(link, &gpd->master_links, master_node) { | |
2320 | seq_printf(s, "%s", link->slave->name); | |
2321 | if (!list_is_last(&link->master_node, &gpd->master_links)) | |
2322 | seq_puts(s, ", "); | |
2323 | } | |
2324 | ||
2325 | list_for_each_entry(pm_data, &gpd->dev_list, list_node) { | |
2326 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); | |
2327 | if (kobj_path == NULL) | |
2328 | continue; | |
2329 | ||
2330 | seq_printf(s, "\n %-50s ", kobj_path); | |
2331 | rtpm_status_str(s, pm_data->dev); | |
2332 | kfree(kobj_path); | |
2333 | } | |
2334 | ||
2335 | seq_puts(s, "\n"); | |
2336 | exit: | |
2337 | mutex_unlock(&gpd->lock); | |
2338 | ||
2339 | return 0; | |
2340 | } | |
2341 | ||
2342 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2343 | { | |
2344 | struct generic_pm_domain *gpd; | |
2345 | int ret = 0; | |
2346 | ||
2347 | seq_puts(s, " domain status slaves\n"); | |
2348 | seq_puts(s, " /device runtime status\n"); | |
2349 | seq_puts(s, "----------------------------------------------------------------------\n"); | |
2350 | ||
2351 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2352 | if (ret) | |
2353 | return -ERESTARTSYS; | |
2354 | ||
2355 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2356 | ret = pm_genpd_summary_one(s, gpd); | |
2357 | if (ret) | |
2358 | break; | |
2359 | } | |
2360 | mutex_unlock(&gpd_list_lock); | |
2361 | ||
2362 | return ret; | |
2363 | } | |
2364 | ||
2365 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2366 | { | |
2367 | return single_open(file, pm_genpd_summary_show, NULL); | |
2368 | } | |
2369 | ||
2370 | static const struct file_operations pm_genpd_summary_fops = { | |
2371 | .open = pm_genpd_summary_open, | |
2372 | .read = seq_read, | |
2373 | .llseek = seq_lseek, | |
2374 | .release = single_release, | |
2375 | }; | |
2376 | ||
2377 | static int __init pm_genpd_debug_init(void) | |
2378 | { | |
2379 | struct dentry *d; | |
2380 | ||
2381 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2382 | ||
2383 | if (!pm_genpd_debugfs_dir) | |
2384 | return -ENOMEM; | |
2385 | ||
2386 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2387 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2388 | if (!d) | |
2389 | return -ENOMEM; | |
2390 | ||
2391 | return 0; | |
2392 | } | |
2393 | late_initcall(pm_genpd_debug_init); | |
2394 | ||
2395 | static void __exit pm_genpd_debug_exit(void) | |
2396 | { | |
2397 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2398 | } | |
2399 | __exitcall(pm_genpd_debug_exit); | |
2400 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |