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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> |
c11f6f5b | 15 | #include <linux/pm_clock.h> |
f721889f RW |
16 | #include <linux/slab.h> |
17 | #include <linux/err.h> | |
17b75eca RW |
18 | #include <linux/sched.h> |
19 | #include <linux/suspend.h> | |
d5e4cbfe RW |
20 | #include <linux/export.h> |
21 | ||
22 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
23 | ({ \ | |
24 | type (*__routine)(struct device *__d); \ | |
25 | type __ret = (type)0; \ | |
26 | \ | |
27 | __routine = genpd->dev_ops.callback; \ | |
28 | if (__routine) { \ | |
29 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
30 | } \ |
31 | __ret; \ | |
32 | }) | |
f721889f | 33 | |
0140d8bd RW |
34 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
35 | ({ \ | |
36 | ktime_t __start = ktime_get(); \ | |
37 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
38 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
39 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
40 | if (!__retval && __elapsed > __td->field) { \ | |
41 | __td->field = __elapsed; \ | |
7d1af287 | 42 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 43 | __elapsed); \ |
6ff7bb0d RW |
44 | genpd->max_off_time_changed = true; \ |
45 | __td->constraint_changed = true; \ | |
0140d8bd RW |
46 | } \ |
47 | __retval; \ | |
48 | }) | |
49 | ||
5125bbf3 RW |
50 | static LIST_HEAD(gpd_list); |
51 | static DEFINE_MUTEX(gpd_list_lock); | |
52 | ||
8bc0251d RW |
53 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
54 | { | |
55 | struct generic_pm_domain *genpd = NULL, *gpd; | |
56 | ||
57 | if (IS_ERR_OR_NULL(domain_name)) | |
58 | return NULL; | |
59 | ||
60 | mutex_lock(&gpd_list_lock); | |
61 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
62 | if (!strcmp(gpd->name, domain_name)) { | |
63 | genpd = gpd; | |
64 | break; | |
65 | } | |
66 | } | |
67 | mutex_unlock(&gpd_list_lock); | |
68 | return genpd; | |
69 | } | |
70 | ||
446d999c RK |
71 | /* |
72 | * Get the generic PM domain for a particular struct device. | |
73 | * This validates the struct device pointer, the PM domain pointer, | |
74 | * and checks that the PM domain pointer is a real generic PM domain. | |
75 | * Any failure results in NULL being returned. | |
76 | */ | |
77 | struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) | |
78 | { | |
79 | struct generic_pm_domain *genpd = NULL, *gpd; | |
80 | ||
81 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
82 | return NULL; | |
83 | ||
84 | mutex_lock(&gpd_list_lock); | |
85 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
86 | if (&gpd->domain == dev->pm_domain) { | |
87 | genpd = gpd; | |
88 | break; | |
89 | } | |
90 | } | |
91 | mutex_unlock(&gpd_list_lock); | |
92 | ||
93 | return genpd; | |
94 | } | |
95 | ||
96 | /* | |
97 | * This should only be used where we are certain that the pm_domain | |
98 | * attached to the device is a genpd domain. | |
99 | */ | |
100 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
101 | { |
102 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
103 | return ERR_PTR(-EINVAL); | |
104 | ||
596ba34b | 105 | return pd_to_genpd(dev->pm_domain); |
5248051b | 106 | } |
f721889f | 107 | |
d5e4cbfe RW |
108 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
109 | { | |
0140d8bd RW |
110 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
111 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
112 | } |
113 | ||
114 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
115 | { | |
0140d8bd RW |
116 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
117 | start_latency_ns, "start"); | |
d5e4cbfe RW |
118 | } |
119 | ||
c4bb3160 | 120 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 121 | { |
c4bb3160 RW |
122 | bool ret = false; |
123 | ||
124 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
125 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
131 | { | |
132 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 133 | smp_mb__after_atomic(); |
f721889f RW |
134 | } |
135 | ||
17b75eca RW |
136 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
137 | { | |
138 | DEFINE_WAIT(wait); | |
139 | ||
140 | mutex_lock(&genpd->lock); | |
141 | /* | |
142 | * Wait for the domain to transition into either the active, | |
143 | * or the power off state. | |
144 | */ | |
145 | for (;;) { | |
146 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
147 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
148 | if (genpd->status == GPD_STATE_ACTIVE |
149 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
150 | break; |
151 | mutex_unlock(&genpd->lock); | |
152 | ||
153 | schedule(); | |
154 | ||
155 | mutex_lock(&genpd->lock); | |
156 | } | |
157 | finish_wait(&genpd->status_wait_queue, &wait); | |
158 | } | |
159 | ||
160 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
161 | { | |
162 | mutex_unlock(&genpd->lock); | |
163 | } | |
164 | ||
c6d22b37 RW |
165 | static void genpd_set_active(struct generic_pm_domain *genpd) |
166 | { | |
167 | if (genpd->resume_count == 0) | |
168 | genpd->status = GPD_STATE_ACTIVE; | |
169 | } | |
170 | ||
cbc9ef02 RW |
171 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
172 | { | |
173 | s64 usecs64; | |
174 | ||
f39cb179 | 175 | if (!genpd->cpuidle_data) |
cbc9ef02 RW |
176 | return; |
177 | ||
178 | usecs64 = genpd->power_on_latency_ns; | |
179 | do_div(usecs64, NSEC_PER_USEC); | |
f39cb179 UH |
180 | usecs64 += genpd->cpuidle_data->saved_exit_latency; |
181 | genpd->cpuidle_data->idle_state->exit_latency = usecs64; | |
cbc9ef02 RW |
182 | } |
183 | ||
c8f0ea45 GU |
184 | static int genpd_power_on(struct generic_pm_domain *genpd) |
185 | { | |
186 | ktime_t time_start; | |
187 | s64 elapsed_ns; | |
188 | int ret; | |
189 | ||
190 | if (!genpd->power_on) | |
191 | return 0; | |
192 | ||
193 | time_start = ktime_get(); | |
194 | ret = genpd->power_on(genpd); | |
195 | if (ret) | |
196 | return ret; | |
197 | ||
198 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
199 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
200 | return ret; | |
201 | ||
202 | genpd->power_on_latency_ns = elapsed_ns; | |
203 | genpd->max_off_time_changed = true; | |
204 | genpd_recalc_cpu_exit_latency(genpd); | |
6d7d5c32 RK |
205 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
206 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
207 | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static int genpd_power_off(struct generic_pm_domain *genpd) | |
212 | { | |
213 | ktime_t time_start; | |
214 | s64 elapsed_ns; | |
215 | int ret; | |
216 | ||
217 | if (!genpd->power_off) | |
218 | return 0; | |
219 | ||
220 | time_start = ktime_get(); | |
221 | ret = genpd->power_off(genpd); | |
222 | if (ret == -EBUSY) | |
223 | return ret; | |
224 | ||
225 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
226 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
227 | return ret; | |
228 | ||
229 | genpd->power_off_latency_ns = elapsed_ns; | |
230 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
231 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
232 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
233 | |
234 | return ret; | |
235 | } | |
236 | ||
5248051b | 237 | /** |
5063ce15 | 238 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
239 | * @genpd: PM domain to power up. |
240 | * | |
5063ce15 | 241 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
242 | * resume a device belonging to it. |
243 | */ | |
8951ef02 | 244 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 245 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 246 | { |
5063ce15 | 247 | struct gpd_link *link; |
3f241775 | 248 | DEFINE_WAIT(wait); |
5248051b RW |
249 | int ret = 0; |
250 | ||
5063ce15 | 251 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
252 | for (;;) { |
253 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
254 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 255 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
256 | break; |
257 | mutex_unlock(&genpd->lock); | |
17b75eca | 258 | |
3f241775 RW |
259 | schedule(); |
260 | ||
261 | mutex_lock(&genpd->lock); | |
262 | } | |
263 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 264 | |
17b75eca | 265 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 266 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 267 | return 0; |
5248051b | 268 | |
c6d22b37 RW |
269 | if (genpd->status != GPD_STATE_POWER_OFF) { |
270 | genpd_set_active(genpd); | |
3f241775 | 271 | return 0; |
c6d22b37 RW |
272 | } |
273 | ||
f39cb179 | 274 | if (genpd->cpuidle_data) { |
cbc9ef02 | 275 | cpuidle_pause_and_lock(); |
f39cb179 | 276 | genpd->cpuidle_data->idle_state->disabled = true; |
cbc9ef02 RW |
277 | cpuidle_resume_and_unlock(); |
278 | goto out; | |
279 | } | |
280 | ||
5063ce15 RW |
281 | /* |
282 | * The list is guaranteed not to change while the loop below is being | |
283 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
284 | * with it. | |
285 | */ | |
286 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
287 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 288 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 289 | |
5248051b | 290 | mutex_unlock(&genpd->lock); |
5248051b | 291 | |
5063ce15 | 292 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
293 | |
294 | mutex_lock(&genpd->lock); | |
295 | ||
3f241775 RW |
296 | /* |
297 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 298 | * while the master is powering on. |
3f241775 RW |
299 | */ |
300 | genpd->status = GPD_STATE_POWER_OFF; | |
301 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
302 | if (ret) { |
303 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 304 | goto err; |
5063ce15 | 305 | } |
5248051b RW |
306 | } |
307 | ||
c8f0ea45 GU |
308 | ret = genpd_power_on(genpd); |
309 | if (ret) | |
310 | goto err; | |
5248051b | 311 | |
cbc9ef02 | 312 | out: |
9e08cf42 RW |
313 | genpd_set_active(genpd); |
314 | ||
3f241775 | 315 | return 0; |
9e08cf42 RW |
316 | |
317 | err: | |
5063ce15 RW |
318 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
319 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 320 | |
3f241775 RW |
321 | return ret; |
322 | } | |
323 | ||
324 | /** | |
5063ce15 | 325 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
326 | * @genpd: PM domain to power up. |
327 | */ | |
328 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
329 | { | |
330 | int ret; | |
331 | ||
332 | mutex_lock(&genpd->lock); | |
333 | ret = __pm_genpd_poweron(genpd); | |
334 | mutex_unlock(&genpd->lock); | |
335 | return ret; | |
5248051b RW |
336 | } |
337 | ||
8bc0251d RW |
338 | /** |
339 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
340 | * @domain_name: Name of the PM domain to power up. | |
341 | */ | |
342 | int pm_genpd_name_poweron(const char *domain_name) | |
343 | { | |
344 | struct generic_pm_domain *genpd; | |
345 | ||
346 | genpd = pm_genpd_lookup_name(domain_name); | |
347 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
348 | } | |
349 | ||
b3d3b9fb SK |
350 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
351 | struct device *dev) | |
352 | { | |
353 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
354 | } | |
355 | ||
8e9afafd RW |
356 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
357 | { | |
358 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
359 | save_state_latency_ns, "state save"); | |
360 | } | |
361 | ||
362 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
363 | { | |
364 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
365 | restore_state_latency_ns, | |
366 | "state restore"); | |
367 | } | |
368 | ||
6ff7bb0d RW |
369 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
370 | unsigned long val, void *ptr) | |
371 | { | |
372 | struct generic_pm_domain_data *gpd_data; | |
373 | struct device *dev; | |
374 | ||
375 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 376 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
377 | |
378 | for (;;) { | |
379 | struct generic_pm_domain *genpd; | |
380 | struct pm_domain_data *pdd; | |
381 | ||
382 | spin_lock_irq(&dev->power.lock); | |
383 | ||
384 | pdd = dev->power.subsys_data ? | |
385 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 386 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
387 | to_gpd_data(pdd)->td.constraint_changed = true; |
388 | genpd = dev_to_genpd(dev); | |
389 | } else { | |
390 | genpd = ERR_PTR(-ENODATA); | |
391 | } | |
392 | ||
393 | spin_unlock_irq(&dev->power.lock); | |
394 | ||
395 | if (!IS_ERR(genpd)) { | |
396 | mutex_lock(&genpd->lock); | |
397 | genpd->max_off_time_changed = true; | |
398 | mutex_unlock(&genpd->lock); | |
399 | } | |
400 | ||
401 | dev = dev->parent; | |
402 | if (!dev || dev->power.ignore_children) | |
403 | break; | |
404 | } | |
405 | ||
406 | return NOTIFY_DONE; | |
407 | } | |
408 | ||
f721889f RW |
409 | /** |
410 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 411 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
412 | * @genpd: PM domain the device belongs to. |
413 | */ | |
4605ab65 | 414 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 415 | struct generic_pm_domain *genpd) |
17b75eca | 416 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 417 | { |
cd0ea672 | 418 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 419 | struct device *dev = pdd->dev; |
f721889f RW |
420 | int ret = 0; |
421 | ||
67732cd3 | 422 | if (gpd_data->need_restore > 0) |
f721889f RW |
423 | return 0; |
424 | ||
67732cd3 UH |
425 | /* |
426 | * If the value of the need_restore flag is still unknown at this point, | |
427 | * we trust that pm_genpd_poweroff() has verified that the device is | |
428 | * already runtime PM suspended. | |
429 | */ | |
430 | if (gpd_data->need_restore < 0) { | |
431 | gpd_data->need_restore = 1; | |
432 | return 0; | |
433 | } | |
434 | ||
17b75eca RW |
435 | mutex_unlock(&genpd->lock); |
436 | ||
ecf00475 RW |
437 | genpd_start_dev(genpd, dev); |
438 | ret = genpd_save_dev(genpd, dev); | |
439 | genpd_stop_dev(genpd, dev); | |
f721889f | 440 | |
17b75eca RW |
441 | mutex_lock(&genpd->lock); |
442 | ||
f721889f | 443 | if (!ret) |
67732cd3 | 444 | gpd_data->need_restore = 1; |
f721889f RW |
445 | |
446 | return ret; | |
447 | } | |
448 | ||
449 | /** | |
450 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 451 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
452 | * @genpd: PM domain the device belongs to. |
453 | */ | |
4605ab65 | 454 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 455 | struct generic_pm_domain *genpd) |
17b75eca | 456 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 457 | { |
cd0ea672 | 458 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 459 | struct device *dev = pdd->dev; |
67732cd3 | 460 | int need_restore = gpd_data->need_restore; |
f721889f | 461 | |
67732cd3 | 462 | gpd_data->need_restore = 0; |
17b75eca RW |
463 | mutex_unlock(&genpd->lock); |
464 | ||
ecf00475 | 465 | genpd_start_dev(genpd, dev); |
67732cd3 UH |
466 | |
467 | /* | |
468 | * Call genpd_restore_dev() for recently added devices too (need_restore | |
469 | * is negative then). | |
470 | */ | |
80de3d7f RW |
471 | if (need_restore) |
472 | genpd_restore_dev(genpd, dev); | |
f721889f | 473 | |
17b75eca | 474 | mutex_lock(&genpd->lock); |
f721889f RW |
475 | } |
476 | ||
c6d22b37 RW |
477 | /** |
478 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
479 | * @genpd: PM domain to check. | |
480 | * | |
481 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
482 | * a "power off" operation, which means that a "power on" has occured in the | |
483 | * meantime, or if its resume_count field is different from zero, which means | |
484 | * that one of its devices has been resumed in the meantime. | |
485 | */ | |
486 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
487 | { | |
17877eb5 | 488 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 489 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
490 | } |
491 | ||
56375fd4 RW |
492 | /** |
493 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
494 | * @genpd: PM domait to power off. | |
495 | * | |
496 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
497 | * before. | |
498 | */ | |
d971f0b0 | 499 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 500 | { |
a4ca26a4 | 501 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
502 | } |
503 | ||
f721889f RW |
504 | /** |
505 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
506 | * @genpd: PM domain to power down. | |
507 | * | |
508 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
509 | * have been powered down, run the runtime suspend callbacks provided by all of | |
510 | * the @genpd's devices' drivers and remove power from @genpd. | |
511 | */ | |
512 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 513 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 514 | { |
4605ab65 | 515 | struct pm_domain_data *pdd; |
5063ce15 | 516 | struct gpd_link *link; |
f721889f | 517 | unsigned int not_suspended; |
c6d22b37 | 518 | int ret = 0; |
f721889f | 519 | |
c6d22b37 RW |
520 | start: |
521 | /* | |
522 | * Do not try to power off the domain in the following situations: | |
523 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 524 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 525 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 526 | * (4) System suspend is in progress. |
c6d22b37 | 527 | */ |
3f241775 | 528 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 529 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 530 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
531 | return 0; |
532 | ||
c4bb3160 | 533 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
534 | return -EBUSY; |
535 | ||
536 | not_suspended = 0; | |
34b1f762 RW |
537 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
538 | enum pm_qos_flags_status stat; | |
539 | ||
540 | stat = dev_pm_qos_flags(pdd->dev, | |
541 | PM_QOS_FLAG_NO_POWER_OFF | |
542 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
543 | if (stat > PM_QOS_FLAGS_NONE) | |
544 | return -EBUSY; | |
545 | ||
0aa2a221 | 546 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 547 | || pdd->dev->power.irq_safe)) |
f721889f | 548 | not_suspended++; |
34b1f762 | 549 | } |
f721889f RW |
550 | |
551 | if (not_suspended > genpd->in_progress) | |
552 | return -EBUSY; | |
553 | ||
c6d22b37 RW |
554 | if (genpd->poweroff_task) { |
555 | /* | |
556 | * Another instance of pm_genpd_poweroff() is executing | |
557 | * callbacks, so tell it to start over and return. | |
558 | */ | |
559 | genpd->status = GPD_STATE_REPEAT; | |
560 | return 0; | |
561 | } | |
562 | ||
f721889f RW |
563 | if (genpd->gov && genpd->gov->power_down_ok) { |
564 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
565 | return -EAGAIN; | |
566 | } | |
567 | ||
17b75eca | 568 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 569 | genpd->poweroff_task = current; |
17b75eca | 570 | |
4605ab65 | 571 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 572 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 573 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
574 | |
575 | if (genpd_abort_poweroff(genpd)) | |
576 | goto out; | |
577 | ||
697a7f37 RW |
578 | if (ret) { |
579 | genpd_set_active(genpd); | |
580 | goto out; | |
581 | } | |
f721889f | 582 | |
c6d22b37 RW |
583 | if (genpd->status == GPD_STATE_REPEAT) { |
584 | genpd->poweroff_task = NULL; | |
585 | goto start; | |
586 | } | |
587 | } | |
17b75eca | 588 | |
f39cb179 | 589 | if (genpd->cpuidle_data) { |
cbc9ef02 | 590 | /* |
f39cb179 UH |
591 | * If cpuidle_data is set, cpuidle should turn the domain off |
592 | * when the CPU in it is idle. In that case we don't decrement | |
593 | * the subdomain counts of the master domains, so that power is | |
594 | * not removed from the current domain prematurely as a result | |
595 | * of cutting off the masters' power. | |
cbc9ef02 RW |
596 | */ |
597 | genpd->status = GPD_STATE_POWER_OFF; | |
598 | cpuidle_pause_and_lock(); | |
f39cb179 | 599 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 RW |
600 | cpuidle_resume_and_unlock(); |
601 | goto out; | |
602 | } | |
603 | ||
3c07cbc4 RW |
604 | if (genpd->power_off) { |
605 | if (atomic_read(&genpd->sd_count) > 0) { | |
606 | ret = -EBUSY; | |
c6d22b37 RW |
607 | goto out; |
608 | } | |
17b75eca | 609 | |
3c07cbc4 | 610 | /* |
5063ce15 RW |
611 | * If sd_count > 0 at this point, one of the subdomains hasn't |
612 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
613 | * incrementing it. In that case pm_genpd_poweron() will wait |
614 | * for us to drop the lock, so we can call .power_off() and let | |
615 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
616 | * happen very often). | |
617 | */ | |
c8f0ea45 | 618 | ret = genpd_power_off(genpd); |
d2805402 RW |
619 | if (ret == -EBUSY) { |
620 | genpd_set_active(genpd); | |
d2805402 RW |
621 | goto out; |
622 | } | |
623 | } | |
f721889f | 624 | |
17b75eca | 625 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 626 | |
5063ce15 RW |
627 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
628 | genpd_sd_counter_dec(link->master); | |
629 | genpd_queue_power_off_work(link->master); | |
630 | } | |
f721889f | 631 | |
c6d22b37 RW |
632 | out: |
633 | genpd->poweroff_task = NULL; | |
634 | wake_up_all(&genpd->status_wait_queue); | |
635 | return ret; | |
f721889f RW |
636 | } |
637 | ||
638 | /** | |
639 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
640 | * @work: Work structure used for scheduling the execution of this function. | |
641 | */ | |
642 | static void genpd_power_off_work_fn(struct work_struct *work) | |
643 | { | |
644 | struct generic_pm_domain *genpd; | |
645 | ||
646 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
647 | ||
17b75eca | 648 | genpd_acquire_lock(genpd); |
f721889f | 649 | pm_genpd_poweroff(genpd); |
17b75eca | 650 | genpd_release_lock(genpd); |
f721889f RW |
651 | } |
652 | ||
653 | /** | |
654 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
655 | * @dev: Device to suspend. | |
656 | * | |
657 | * Carry out a runtime suspend of a device under the assumption that its | |
658 | * pm_domain field points to the domain member of an object of type | |
659 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
660 | */ | |
661 | static int pm_genpd_runtime_suspend(struct device *dev) | |
662 | { | |
663 | struct generic_pm_domain *genpd; | |
67732cd3 | 664 | struct generic_pm_domain_data *gpd_data; |
b02c999a | 665 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 666 | int ret; |
f721889f RW |
667 | |
668 | dev_dbg(dev, "%s()\n", __func__); | |
669 | ||
5248051b RW |
670 | genpd = dev_to_genpd(dev); |
671 | if (IS_ERR(genpd)) | |
f721889f RW |
672 | return -EINVAL; |
673 | ||
b02c999a RW |
674 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
675 | if (stop_ok && !stop_ok(dev)) | |
676 | return -EBUSY; | |
677 | ||
d5e4cbfe RW |
678 | ret = genpd_stop_dev(genpd, dev); |
679 | if (ret) | |
680 | return ret; | |
17b75eca | 681 | |
0aa2a221 RW |
682 | /* |
683 | * If power.irq_safe is set, this routine will be run with interrupts | |
684 | * off, so it can't use mutexes. | |
685 | */ | |
686 | if (dev->power.irq_safe) | |
687 | return 0; | |
688 | ||
c6d22b37 | 689 | mutex_lock(&genpd->lock); |
67732cd3 UH |
690 | |
691 | /* | |
692 | * If we have an unknown state of the need_restore flag, it means none | |
693 | * of the runtime PM callbacks has been invoked yet. Let's update the | |
694 | * flag to reflect that the current state is active. | |
695 | */ | |
696 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
697 | if (gpd_data->need_restore < 0) | |
698 | gpd_data->need_restore = 0; | |
699 | ||
f721889f RW |
700 | genpd->in_progress++; |
701 | pm_genpd_poweroff(genpd); | |
702 | genpd->in_progress--; | |
c6d22b37 | 703 | mutex_unlock(&genpd->lock); |
f721889f RW |
704 | |
705 | return 0; | |
706 | } | |
707 | ||
f721889f RW |
708 | /** |
709 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
710 | * @dev: Device to resume. | |
711 | * | |
712 | * Carry out a runtime resume of a device under the assumption that its | |
713 | * pm_domain field points to the domain member of an object of type | |
714 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
715 | */ | |
716 | static int pm_genpd_runtime_resume(struct device *dev) | |
717 | { | |
718 | struct generic_pm_domain *genpd; | |
c6d22b37 | 719 | DEFINE_WAIT(wait); |
f721889f RW |
720 | int ret; |
721 | ||
722 | dev_dbg(dev, "%s()\n", __func__); | |
723 | ||
5248051b RW |
724 | genpd = dev_to_genpd(dev); |
725 | if (IS_ERR(genpd)) | |
f721889f RW |
726 | return -EINVAL; |
727 | ||
0aa2a221 RW |
728 | /* If power.irq_safe, the PM domain is never powered off. */ |
729 | if (dev->power.irq_safe) | |
e2e3e4e5 | 730 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 731 | |
c6d22b37 | 732 | mutex_lock(&genpd->lock); |
3f241775 RW |
733 | ret = __pm_genpd_poweron(genpd); |
734 | if (ret) { | |
735 | mutex_unlock(&genpd->lock); | |
736 | return ret; | |
737 | } | |
17b75eca | 738 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
739 | genpd->resume_count++; |
740 | for (;;) { | |
741 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
742 | TASK_UNINTERRUPTIBLE); | |
743 | /* | |
744 | * If current is the powering off task, we have been called | |
745 | * reentrantly from one of the device callbacks, so we should | |
746 | * not wait. | |
747 | */ | |
748 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
749 | break; | |
750 | mutex_unlock(&genpd->lock); | |
751 | ||
752 | schedule(); | |
753 | ||
754 | mutex_lock(&genpd->lock); | |
755 | } | |
756 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 757 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
758 | genpd->resume_count--; |
759 | genpd_set_active(genpd); | |
17b75eca | 760 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 761 | mutex_unlock(&genpd->lock); |
17b75eca | 762 | |
f721889f RW |
763 | return 0; |
764 | } | |
765 | ||
39ac5ba5 TB |
766 | static bool pd_ignore_unused; |
767 | static int __init pd_ignore_unused_setup(char *__unused) | |
768 | { | |
769 | pd_ignore_unused = true; | |
770 | return 1; | |
771 | } | |
772 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
773 | ||
17f2ae7f RW |
774 | /** |
775 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
776 | */ | |
777 | void pm_genpd_poweroff_unused(void) | |
778 | { | |
779 | struct generic_pm_domain *genpd; | |
780 | ||
39ac5ba5 TB |
781 | if (pd_ignore_unused) { |
782 | pr_warn("genpd: Not disabling unused power domains\n"); | |
783 | return; | |
784 | } | |
785 | ||
17f2ae7f RW |
786 | mutex_lock(&gpd_list_lock); |
787 | ||
788 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
789 | genpd_queue_power_off_work(genpd); | |
790 | ||
791 | mutex_unlock(&gpd_list_lock); | |
792 | } | |
793 | ||
2fe71dcd UH |
794 | static int __init genpd_poweroff_unused(void) |
795 | { | |
796 | pm_genpd_poweroff_unused(); | |
797 | return 0; | |
798 | } | |
799 | late_initcall(genpd_poweroff_unused); | |
800 | ||
596ba34b RW |
801 | #ifdef CONFIG_PM_SLEEP |
802 | ||
77f827de RW |
803 | /** |
804 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
805 | * @genpd: PM domain to check. | |
806 | */ | |
895b31f3 | 807 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 808 | { |
895b31f3 | 809 | const struct generic_pm_domain *gpd; |
77f827de RW |
810 | |
811 | if (IS_ERR_OR_NULL(genpd)) | |
812 | return false; | |
813 | ||
814 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
815 | if (gpd == genpd) | |
816 | return true; | |
817 | ||
818 | return false; | |
819 | } | |
820 | ||
d5e4cbfe RW |
821 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
822 | struct device *dev) | |
823 | { | |
824 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
825 | } | |
826 | ||
596ba34b | 827 | /** |
5063ce15 | 828 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
829 | * @genpd: PM domain to power off, if possible. |
830 | * | |
831 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 832 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 833 | * |
77f827de RW |
834 | * This function is only called in "noirq" and "syscore" stages of system power |
835 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
836 | * executed sequentially, so it is guaranteed that it will never run twice in | |
837 | * parallel). | |
596ba34b RW |
838 | */ |
839 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
840 | { | |
5063ce15 | 841 | struct gpd_link *link; |
596ba34b | 842 | |
17b75eca | 843 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
844 | return; |
845 | ||
c4bb3160 RW |
846 | if (genpd->suspended_count != genpd->device_count |
847 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
848 | return; |
849 | ||
c8f0ea45 | 850 | genpd_power_off(genpd); |
596ba34b | 851 | |
17b75eca | 852 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
853 | |
854 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
855 | genpd_sd_counter_dec(link->master); | |
856 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
857 | } |
858 | } | |
859 | ||
802d8b49 RW |
860 | /** |
861 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
862 | * @genpd: PM domain to power on. | |
863 | * | |
77f827de RW |
864 | * This function is only called in "noirq" and "syscore" stages of system power |
865 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
866 | * executed sequentially, so it is guaranteed that it will never run twice in | |
867 | * parallel). | |
802d8b49 RW |
868 | */ |
869 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
870 | { | |
871 | struct gpd_link *link; | |
872 | ||
873 | if (genpd->status != GPD_STATE_POWER_OFF) | |
874 | return; | |
875 | ||
876 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
877 | pm_genpd_sync_poweron(link->master); | |
878 | genpd_sd_counter_inc(link->master); | |
879 | } | |
880 | ||
c8f0ea45 | 881 | genpd_power_on(genpd); |
802d8b49 RW |
882 | |
883 | genpd->status = GPD_STATE_ACTIVE; | |
884 | } | |
885 | ||
4ecd6e65 RW |
886 | /** |
887 | * resume_needed - Check whether to resume a device before system suspend. | |
888 | * @dev: Device to check. | |
889 | * @genpd: PM domain the device belongs to. | |
890 | * | |
891 | * There are two cases in which a device that can wake up the system from sleep | |
892 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
893 | * to wake up the system and it has to remain active for this purpose while the | |
894 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
895 | * the system from sleep states and it generally doesn't generate wakeup signals | |
896 | * by itself (those signals are generated on its behalf by other parts of the | |
897 | * system). In the latter case it may be necessary to reconfigure the device's | |
898 | * wakeup settings during system suspend, because it may have been set up to | |
899 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
900 | * Return 'true' in either of the above cases. | |
901 | */ | |
902 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
903 | { | |
904 | bool active_wakeup; | |
905 | ||
906 | if (!device_can_wakeup(dev)) | |
907 | return false; | |
908 | ||
d5e4cbfe | 909 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
910 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
911 | } | |
912 | ||
596ba34b RW |
913 | /** |
914 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
915 | * @dev: Device to start the transition of. | |
916 | * | |
917 | * Start a power transition of a device (during a system-wide power transition) | |
918 | * under the assumption that its pm_domain field points to the domain member of | |
919 | * an object of type struct generic_pm_domain representing a PM domain | |
920 | * consisting of I/O devices. | |
921 | */ | |
922 | static int pm_genpd_prepare(struct device *dev) | |
923 | { | |
924 | struct generic_pm_domain *genpd; | |
b6c10c84 | 925 | int ret; |
596ba34b RW |
926 | |
927 | dev_dbg(dev, "%s()\n", __func__); | |
928 | ||
929 | genpd = dev_to_genpd(dev); | |
930 | if (IS_ERR(genpd)) | |
931 | return -EINVAL; | |
932 | ||
17b75eca RW |
933 | /* |
934 | * If a wakeup request is pending for the device, it should be woken up | |
935 | * at this point and a system wakeup event should be reported if it's | |
936 | * set up to wake up the system from sleep states. | |
937 | */ | |
938 | pm_runtime_get_noresume(dev); | |
939 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
940 | pm_wakeup_event(dev, 0); | |
941 | ||
942 | if (pm_wakeup_pending()) { | |
84167035 | 943 | pm_runtime_put(dev); |
17b75eca RW |
944 | return -EBUSY; |
945 | } | |
946 | ||
4ecd6e65 RW |
947 | if (resume_needed(dev, genpd)) |
948 | pm_runtime_resume(dev); | |
949 | ||
17b75eca | 950 | genpd_acquire_lock(genpd); |
596ba34b | 951 | |
65533bbf RW |
952 | if (genpd->prepared_count++ == 0) { |
953 | genpd->suspended_count = 0; | |
17b75eca | 954 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 955 | } |
17b75eca RW |
956 | |
957 | genpd_release_lock(genpd); | |
596ba34b RW |
958 | |
959 | if (genpd->suspend_power_off) { | |
17b75eca | 960 | pm_runtime_put_noidle(dev); |
596ba34b RW |
961 | return 0; |
962 | } | |
963 | ||
964 | /* | |
17b75eca RW |
965 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
966 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 967 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 968 | * to make it operational. |
596ba34b | 969 | */ |
17b75eca | 970 | pm_runtime_resume(dev); |
596ba34b RW |
971 | __pm_runtime_disable(dev, false); |
972 | ||
b6c10c84 RW |
973 | ret = pm_generic_prepare(dev); |
974 | if (ret) { | |
975 | mutex_lock(&genpd->lock); | |
976 | ||
977 | if (--genpd->prepared_count == 0) | |
978 | genpd->suspend_power_off = false; | |
979 | ||
980 | mutex_unlock(&genpd->lock); | |
17b75eca | 981 | pm_runtime_enable(dev); |
b6c10c84 | 982 | } |
17b75eca | 983 | |
84167035 | 984 | pm_runtime_put(dev); |
b6c10c84 | 985 | return ret; |
596ba34b RW |
986 | } |
987 | ||
988 | /** | |
989 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
990 | * @dev: Device to suspend. | |
991 | * | |
992 | * Suspend a device under the assumption that its pm_domain field points to the | |
993 | * domain member of an object of type struct generic_pm_domain representing | |
994 | * a PM domain consisting of I/O devices. | |
995 | */ | |
996 | static int pm_genpd_suspend(struct device *dev) | |
997 | { | |
998 | struct generic_pm_domain *genpd; | |
999 | ||
1000 | dev_dbg(dev, "%s()\n", __func__); | |
1001 | ||
1002 | genpd = dev_to_genpd(dev); | |
1003 | if (IS_ERR(genpd)) | |
1004 | return -EINVAL; | |
1005 | ||
1e0407ca | 1006 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
1007 | } |
1008 | ||
1009 | /** | |
0496c8ae | 1010 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
1011 | * @dev: Device to suspend. |
1012 | * | |
1013 | * Carry out a late suspend of a device under the assumption that its | |
1014 | * pm_domain field points to the domain member of an object of type | |
1015 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
1016 | */ | |
0496c8ae | 1017 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
1018 | { |
1019 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1020 | |
1021 | dev_dbg(dev, "%s()\n", __func__); | |
1022 | ||
1023 | genpd = dev_to_genpd(dev); | |
1024 | if (IS_ERR(genpd)) | |
1025 | return -EINVAL; | |
1026 | ||
1e0407ca | 1027 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 1028 | } |
596ba34b | 1029 | |
0496c8ae RW |
1030 | /** |
1031 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
1032 | * @dev: Device to suspend. | |
1033 | * | |
1034 | * Stop the device and remove power from the domain if all devices in it have | |
1035 | * been stopped. | |
1036 | */ | |
1037 | static int pm_genpd_suspend_noirq(struct device *dev) | |
1038 | { | |
1039 | struct generic_pm_domain *genpd; | |
1040 | ||
1041 | dev_dbg(dev, "%s()\n", __func__); | |
1042 | ||
1043 | genpd = dev_to_genpd(dev); | |
1044 | if (IS_ERR(genpd)) | |
1045 | return -EINVAL; | |
596ba34b | 1046 | |
dbf37414 | 1047 | if (genpd->suspend_power_off |
0496c8ae | 1048 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1049 | return 0; |
1050 | ||
d5e4cbfe | 1051 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1052 | |
1053 | /* | |
1054 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1055 | * guaranteed that this function will never run twice in parallel for | |
1056 | * the same PM domain, so it is not necessary to use locking here. | |
1057 | */ | |
1058 | genpd->suspended_count++; | |
1059 | pm_genpd_sync_poweroff(genpd); | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | /** | |
0496c8ae | 1065 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1066 | * @dev: Device to resume. |
1067 | * | |
0496c8ae | 1068 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1069 | */ |
1070 | static int pm_genpd_resume_noirq(struct device *dev) | |
1071 | { | |
1072 | struct generic_pm_domain *genpd; | |
1073 | ||
1074 | dev_dbg(dev, "%s()\n", __func__); | |
1075 | ||
1076 | genpd = dev_to_genpd(dev); | |
1077 | if (IS_ERR(genpd)) | |
1078 | return -EINVAL; | |
1079 | ||
dbf37414 | 1080 | if (genpd->suspend_power_off |
cc85b207 | 1081 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1082 | return 0; |
1083 | ||
1084 | /* | |
1085 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1086 | * guaranteed that this function will never run twice in parallel for | |
1087 | * the same PM domain, so it is not necessary to use locking here. | |
1088 | */ | |
802d8b49 | 1089 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1090 | genpd->suspended_count--; |
596ba34b | 1091 | |
0496c8ae | 1092 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1093 | } |
1094 | ||
1095 | /** | |
0496c8ae RW |
1096 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1097 | * @dev: Device to resume. | |
1098 | * | |
1099 | * Carry out an early resume of a device under the assumption that its | |
1100 | * pm_domain field points to the domain member of an object of type | |
1101 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1102 | * devices. | |
1103 | */ | |
1104 | static int pm_genpd_resume_early(struct device *dev) | |
1105 | { | |
1106 | struct generic_pm_domain *genpd; | |
1107 | ||
1108 | dev_dbg(dev, "%s()\n", __func__); | |
1109 | ||
1110 | genpd = dev_to_genpd(dev); | |
1111 | if (IS_ERR(genpd)) | |
1112 | return -EINVAL; | |
1113 | ||
1e0407ca | 1114 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1115 | } |
1116 | ||
1117 | /** | |
1118 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1119 | * @dev: Device to resume. |
1120 | * | |
1121 | * Resume a device under the assumption that its pm_domain field points to the | |
1122 | * domain member of an object of type struct generic_pm_domain representing | |
1123 | * a power domain consisting of I/O devices. | |
1124 | */ | |
1125 | static int pm_genpd_resume(struct device *dev) | |
1126 | { | |
1127 | struct generic_pm_domain *genpd; | |
1128 | ||
1129 | dev_dbg(dev, "%s()\n", __func__); | |
1130 | ||
1131 | genpd = dev_to_genpd(dev); | |
1132 | if (IS_ERR(genpd)) | |
1133 | return -EINVAL; | |
1134 | ||
1e0407ca | 1135 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1136 | } |
1137 | ||
1138 | /** | |
0496c8ae | 1139 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1140 | * @dev: Device to freeze. |
1141 | * | |
1142 | * Freeze a device under the assumption that its pm_domain field points to the | |
1143 | * domain member of an object of type struct generic_pm_domain representing | |
1144 | * a power domain consisting of I/O devices. | |
1145 | */ | |
1146 | static int pm_genpd_freeze(struct device *dev) | |
1147 | { | |
1148 | struct generic_pm_domain *genpd; | |
1149 | ||
1150 | dev_dbg(dev, "%s()\n", __func__); | |
1151 | ||
1152 | genpd = dev_to_genpd(dev); | |
1153 | if (IS_ERR(genpd)) | |
1154 | return -EINVAL; | |
1155 | ||
1e0407ca | 1156 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1157 | } |
1158 | ||
1159 | /** | |
0496c8ae RW |
1160 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1161 | * @dev: Device to freeze. | |
1162 | * | |
1163 | * Carry out a late freeze of a device under the assumption that its | |
1164 | * pm_domain field points to the domain member of an object of type | |
1165 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1166 | * devices. | |
1167 | */ | |
1168 | static int pm_genpd_freeze_late(struct device *dev) | |
1169 | { | |
1170 | struct generic_pm_domain *genpd; | |
1171 | ||
1172 | dev_dbg(dev, "%s()\n", __func__); | |
1173 | ||
1174 | genpd = dev_to_genpd(dev); | |
1175 | if (IS_ERR(genpd)) | |
1176 | return -EINVAL; | |
1177 | ||
1e0407ca | 1178 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
1179 | } |
1180 | ||
1181 | /** | |
1182 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1183 | * @dev: Device to freeze. |
1184 | * | |
1185 | * Carry out a late freeze of a device under the assumption that its | |
1186 | * pm_domain field points to the domain member of an object of type | |
1187 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1188 | * devices. | |
1189 | */ | |
1190 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1191 | { | |
1192 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1193 | |
1194 | dev_dbg(dev, "%s()\n", __func__); | |
1195 | ||
1196 | genpd = dev_to_genpd(dev); | |
1197 | if (IS_ERR(genpd)) | |
1198 | return -EINVAL; | |
1199 | ||
dbf37414 | 1200 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1201 | } |
596ba34b | 1202 | |
0496c8ae RW |
1203 | /** |
1204 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1205 | * @dev: Device to thaw. | |
1206 | * | |
1207 | * Start the device, unless power has been removed from the domain already | |
1208 | * before the system transition. | |
1209 | */ | |
1210 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1211 | { | |
1212 | struct generic_pm_domain *genpd; | |
596ba34b | 1213 | |
0496c8ae | 1214 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1215 | |
0496c8ae RW |
1216 | genpd = dev_to_genpd(dev); |
1217 | if (IS_ERR(genpd)) | |
1218 | return -EINVAL; | |
1219 | ||
dbf37414 | 1220 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1221 | } |
1222 | ||
1223 | /** | |
0496c8ae | 1224 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1225 | * @dev: Device to thaw. |
1226 | * | |
1227 | * Carry out an early thaw of a device under the assumption that its | |
1228 | * pm_domain field points to the domain member of an object of type | |
1229 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1230 | * devices. | |
1231 | */ | |
0496c8ae | 1232 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1233 | { |
1234 | struct generic_pm_domain *genpd; | |
1235 | ||
1236 | dev_dbg(dev, "%s()\n", __func__); | |
1237 | ||
1238 | genpd = dev_to_genpd(dev); | |
1239 | if (IS_ERR(genpd)) | |
1240 | return -EINVAL; | |
1241 | ||
1e0407ca | 1242 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1243 | } |
1244 | ||
1245 | /** | |
1246 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1247 | * @dev: Device to thaw. | |
1248 | * | |
1249 | * Thaw a device under the assumption that its pm_domain field points to the | |
1250 | * domain member of an object of type struct generic_pm_domain representing | |
1251 | * a power domain consisting of I/O devices. | |
1252 | */ | |
1253 | static int pm_genpd_thaw(struct device *dev) | |
1254 | { | |
1255 | struct generic_pm_domain *genpd; | |
1256 | ||
1257 | dev_dbg(dev, "%s()\n", __func__); | |
1258 | ||
1259 | genpd = dev_to_genpd(dev); | |
1260 | if (IS_ERR(genpd)) | |
1261 | return -EINVAL; | |
1262 | ||
1e0407ca | 1263 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1264 | } |
1265 | ||
1266 | /** | |
0496c8ae | 1267 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1268 | * @dev: Device to resume. |
1269 | * | |
0496c8ae RW |
1270 | * Make sure the domain will be in the same power state as before the |
1271 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1272 | */ |
1273 | static int pm_genpd_restore_noirq(struct device *dev) | |
1274 | { | |
1275 | struct generic_pm_domain *genpd; | |
1276 | ||
1277 | dev_dbg(dev, "%s()\n", __func__); | |
1278 | ||
1279 | genpd = dev_to_genpd(dev); | |
1280 | if (IS_ERR(genpd)) | |
1281 | return -EINVAL; | |
1282 | ||
1283 | /* | |
1284 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1285 | * guaranteed that this function will never run twice in parallel for | |
1286 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1287 | * |
1288 | * At this point suspended_count == 0 means we are being run for the | |
1289 | * first time for the given domain in the present cycle. | |
596ba34b | 1290 | */ |
65533bbf | 1291 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1292 | /* |
65533bbf | 1293 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1294 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1295 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1296 | */ |
65533bbf RW |
1297 | genpd->status = GPD_STATE_POWER_OFF; |
1298 | if (genpd->suspend_power_off) { | |
1299 | /* | |
1300 | * If the domain was off before the hibernation, make | |
1301 | * sure it will be off going forward. | |
1302 | */ | |
c8f0ea45 | 1303 | genpd_power_off(genpd); |
65533bbf RW |
1304 | |
1305 | return 0; | |
1306 | } | |
596ba34b RW |
1307 | } |
1308 | ||
18dd2ece RW |
1309 | if (genpd->suspend_power_off) |
1310 | return 0; | |
1311 | ||
802d8b49 | 1312 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1313 | |
dbf37414 | 1314 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1315 | } |
1316 | ||
1317 | /** | |
1318 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1319 | * @dev: Device to complete the transition of. | |
1320 | * | |
1321 | * Complete a power transition of a device (during a system-wide power | |
1322 | * transition) under the assumption that its pm_domain field points to the | |
1323 | * domain member of an object of type struct generic_pm_domain representing | |
1324 | * a power domain consisting of I/O devices. | |
1325 | */ | |
1326 | static void pm_genpd_complete(struct device *dev) | |
1327 | { | |
1328 | struct generic_pm_domain *genpd; | |
1329 | bool run_complete; | |
1330 | ||
1331 | dev_dbg(dev, "%s()\n", __func__); | |
1332 | ||
1333 | genpd = dev_to_genpd(dev); | |
1334 | if (IS_ERR(genpd)) | |
1335 | return; | |
1336 | ||
1337 | mutex_lock(&genpd->lock); | |
1338 | ||
1339 | run_complete = !genpd->suspend_power_off; | |
1340 | if (--genpd->prepared_count == 0) | |
1341 | genpd->suspend_power_off = false; | |
1342 | ||
1343 | mutex_unlock(&genpd->lock); | |
1344 | ||
1345 | if (run_complete) { | |
1346 | pm_generic_complete(dev); | |
6f00ff78 | 1347 | pm_runtime_set_active(dev); |
596ba34b | 1348 | pm_runtime_enable(dev); |
af939339 | 1349 | pm_request_idle(dev); |
596ba34b RW |
1350 | } |
1351 | } | |
1352 | ||
77f827de | 1353 | /** |
d47e6464 | 1354 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1355 | * @dev: Device that normally is marked as "always on" to switch power for. |
1356 | * | |
1357 | * This routine may only be called during the system core (syscore) suspend or | |
1358 | * resume phase for devices whose "always on" flags are set. | |
1359 | */ | |
d47e6464 | 1360 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1361 | { |
1362 | struct generic_pm_domain *genpd; | |
1363 | ||
1364 | genpd = dev_to_genpd(dev); | |
1365 | if (!pm_genpd_present(genpd)) | |
1366 | return; | |
1367 | ||
1368 | if (suspend) { | |
1369 | genpd->suspended_count++; | |
1370 | pm_genpd_sync_poweroff(genpd); | |
1371 | } else { | |
1372 | pm_genpd_sync_poweron(genpd); | |
1373 | genpd->suspended_count--; | |
1374 | } | |
1375 | } | |
d47e6464 UH |
1376 | |
1377 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1378 | { | |
1379 | genpd_syscore_switch(dev, true); | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1382 | ||
1383 | void pm_genpd_syscore_poweron(struct device *dev) | |
1384 | { | |
1385 | genpd_syscore_switch(dev, false); | |
1386 | } | |
1387 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1388 | |
d30d819d | 1389 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1390 | |
1391 | #define pm_genpd_prepare NULL | |
1392 | #define pm_genpd_suspend NULL | |
0496c8ae | 1393 | #define pm_genpd_suspend_late NULL |
596ba34b | 1394 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1395 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1396 | #define pm_genpd_resume_noirq NULL |
1397 | #define pm_genpd_resume NULL | |
1398 | #define pm_genpd_freeze NULL | |
0496c8ae | 1399 | #define pm_genpd_freeze_late NULL |
596ba34b | 1400 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1401 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1402 | #define pm_genpd_thaw_noirq NULL |
1403 | #define pm_genpd_thaw NULL | |
596ba34b | 1404 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1405 | #define pm_genpd_complete NULL |
1406 | ||
1407 | #endif /* CONFIG_PM_SLEEP */ | |
1408 | ||
f104e1e5 UH |
1409 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1410 | struct generic_pm_domain *genpd, | |
1411 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1412 | { |
1413 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1414 | int ret; |
1415 | ||
1416 | ret = dev_pm_get_subsys_data(dev); | |
1417 | if (ret) | |
1418 | return ERR_PTR(ret); | |
1d5fcfec RW |
1419 | |
1420 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1421 | if (!gpd_data) { |
1422 | ret = -ENOMEM; | |
1423 | goto err_put; | |
1424 | } | |
1d5fcfec | 1425 | |
f104e1e5 UH |
1426 | if (td) |
1427 | gpd_data->td = *td; | |
1428 | ||
1429 | gpd_data->base.dev = dev; | |
1430 | gpd_data->need_restore = -1; | |
1431 | gpd_data->td.constraint_changed = true; | |
1432 | gpd_data->td.effective_constraint_ns = -1; | |
1433 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1434 | ||
1435 | spin_lock_irq(&dev->power.lock); | |
1436 | ||
1437 | if (dev->power.subsys_data->domain_data) { | |
1438 | ret = -EINVAL; | |
1439 | goto err_free; | |
1440 | } | |
1441 | ||
1442 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1443 | dev->pm_domain = &genpd->domain; | |
1444 | ||
1445 | spin_unlock_irq(&dev->power.lock); | |
1446 | ||
1d5fcfec | 1447 | return gpd_data; |
3e235685 | 1448 | |
f104e1e5 UH |
1449 | err_free: |
1450 | spin_unlock_irq(&dev->power.lock); | |
1451 | kfree(gpd_data); | |
3e235685 UH |
1452 | err_put: |
1453 | dev_pm_put_subsys_data(dev); | |
1454 | return ERR_PTR(ret); | |
1d5fcfec RW |
1455 | } |
1456 | ||
49d400c7 UH |
1457 | static void genpd_free_dev_data(struct device *dev, |
1458 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1459 | { |
f104e1e5 UH |
1460 | spin_lock_irq(&dev->power.lock); |
1461 | ||
1462 | dev->pm_domain = NULL; | |
1463 | dev->power.subsys_data->domain_data = NULL; | |
1464 | ||
1465 | spin_unlock_irq(&dev->power.lock); | |
1466 | ||
1d5fcfec | 1467 | kfree(gpd_data); |
3e235685 | 1468 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1469 | } |
1470 | ||
f721889f | 1471 | /** |
b02c999a | 1472 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1473 | * @genpd: PM domain to add the device to. |
1474 | * @dev: Device to be added. | |
b02c999a | 1475 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1476 | */ |
b02c999a RW |
1477 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1478 | struct gpd_timing_data *td) | |
f721889f | 1479 | { |
c0356db7 | 1480 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1481 | int ret = 0; |
1482 | ||
1483 | dev_dbg(dev, "%s()\n", __func__); | |
1484 | ||
1485 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1486 | return -EINVAL; | |
1487 | ||
f104e1e5 | 1488 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1489 | if (IS_ERR(gpd_data)) |
1490 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1491 | |
17b75eca | 1492 | genpd_acquire_lock(genpd); |
f721889f | 1493 | |
596ba34b RW |
1494 | if (genpd->prepared_count > 0) { |
1495 | ret = -EAGAIN; | |
1496 | goto out; | |
1497 | } | |
1498 | ||
b472c2fa UH |
1499 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1500 | if (ret) | |
1501 | goto out; | |
d79b6fe1 | 1502 | |
14b53064 UH |
1503 | genpd->device_count++; |
1504 | genpd->max_off_time_changed = true; | |
1505 | ||
1d5fcfec | 1506 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1507 | |
f721889f | 1508 | out: |
17b75eca | 1509 | genpd_release_lock(genpd); |
f721889f | 1510 | |
c0356db7 UH |
1511 | if (ret) |
1512 | genpd_free_dev_data(dev, gpd_data); | |
1513 | else | |
1514 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1515 | |
f721889f RW |
1516 | return ret; |
1517 | } | |
1518 | ||
b5abb085 RW |
1519 | /** |
1520 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1521 | * @domain_name: Name of the PM domain to add the device to. | |
1522 | * @dev: Device to be added. | |
1523 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1524 | */ | |
1525 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1526 | struct gpd_timing_data *td) | |
1527 | { | |
8bc0251d | 1528 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1529 | } |
1530 | ||
f721889f RW |
1531 | /** |
1532 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1533 | * @genpd: PM domain to remove the device from. | |
1534 | * @dev: Device to be removed. | |
1535 | */ | |
1536 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1537 | struct device *dev) | |
1538 | { | |
6ff7bb0d | 1539 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1540 | struct pm_domain_data *pdd; |
efa69025 | 1541 | int ret = 0; |
f721889f RW |
1542 | |
1543 | dev_dbg(dev, "%s()\n", __func__); | |
1544 | ||
df6a0d6f | 1545 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1546 | return -EINVAL; |
1547 | ||
c0356db7 UH |
1548 | /* The above validation also means we have existing domain_data. */ |
1549 | pdd = dev->power.subsys_data->domain_data; | |
1550 | gpd_data = to_gpd_data(pdd); | |
1551 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1552 | ||
17b75eca | 1553 | genpd_acquire_lock(genpd); |
f721889f | 1554 | |
596ba34b RW |
1555 | if (genpd->prepared_count > 0) { |
1556 | ret = -EAGAIN; | |
1557 | goto out; | |
1558 | } | |
1559 | ||
6ff7bb0d RW |
1560 | genpd->device_count--; |
1561 | genpd->max_off_time_changed = true; | |
1562 | ||
d79b6fe1 | 1563 | if (genpd->detach_dev) |
c16561e8 | 1564 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1565 | |
efa69025 | 1566 | list_del_init(&pdd->list_node); |
6ff7bb0d RW |
1567 | |
1568 | genpd_release_lock(genpd); | |
1569 | ||
c1dbe2fb | 1570 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1571 | |
6ff7bb0d | 1572 | return 0; |
f721889f | 1573 | |
596ba34b | 1574 | out: |
17b75eca | 1575 | genpd_release_lock(genpd); |
c0356db7 | 1576 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1577 | |
1578 | return ret; | |
1579 | } | |
1580 | ||
1581 | /** | |
1582 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1583 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1584 | * @subdomain: Subdomain to be added. |
f721889f RW |
1585 | */ |
1586 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1587 | struct generic_pm_domain *subdomain) |
f721889f | 1588 | { |
5063ce15 | 1589 | struct gpd_link *link; |
f721889f RW |
1590 | int ret = 0; |
1591 | ||
fb7268be RW |
1592 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1593 | || genpd == subdomain) | |
f721889f RW |
1594 | return -EINVAL; |
1595 | ||
17b75eca RW |
1596 | start: |
1597 | genpd_acquire_lock(genpd); | |
bc0403ff | 1598 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1599 | |
bc0403ff RW |
1600 | if (subdomain->status != GPD_STATE_POWER_OFF |
1601 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1602 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1603 | genpd_release_lock(genpd); |
1604 | goto start; | |
1605 | } | |
1606 | ||
1607 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1608 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1609 | ret = -EINVAL; |
1610 | goto out; | |
1611 | } | |
1612 | ||
4fcac10d | 1613 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1614 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1615 | ret = -EINVAL; |
1616 | goto out; | |
1617 | } | |
1618 | } | |
1619 | ||
5063ce15 RW |
1620 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1621 | if (!link) { | |
1622 | ret = -ENOMEM; | |
1623 | goto out; | |
1624 | } | |
1625 | link->master = genpd; | |
1626 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1627 | link->slave = subdomain; |
1628 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1629 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1630 | genpd_sd_counter_inc(genpd); |
f721889f | 1631 | |
f721889f | 1632 | out: |
bc0403ff | 1633 | mutex_unlock(&subdomain->lock); |
17b75eca | 1634 | genpd_release_lock(genpd); |
f721889f RW |
1635 | |
1636 | return ret; | |
1637 | } | |
1638 | ||
fb7268be RW |
1639 | /** |
1640 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1641 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1642 | * @subdomain_name: Name of the subdomain to be added. | |
1643 | */ | |
1644 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1645 | const char *subdomain_name) | |
1646 | { | |
1647 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1648 | ||
1649 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1650 | return -EINVAL; | |
1651 | ||
1652 | mutex_lock(&gpd_list_lock); | |
1653 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1654 | if (!master && !strcmp(gpd->name, master_name)) | |
1655 | master = gpd; | |
1656 | ||
1657 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1658 | subdomain = gpd; | |
1659 | ||
1660 | if (master && subdomain) | |
1661 | break; | |
1662 | } | |
1663 | mutex_unlock(&gpd_list_lock); | |
1664 | ||
1665 | return pm_genpd_add_subdomain(master, subdomain); | |
1666 | } | |
1667 | ||
f721889f RW |
1668 | /** |
1669 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1670 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1671 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1672 | */ |
1673 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1674 | struct generic_pm_domain *subdomain) |
f721889f | 1675 | { |
5063ce15 | 1676 | struct gpd_link *link; |
f721889f RW |
1677 | int ret = -EINVAL; |
1678 | ||
5063ce15 | 1679 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1680 | return -EINVAL; |
1681 | ||
17b75eca RW |
1682 | start: |
1683 | genpd_acquire_lock(genpd); | |
f721889f | 1684 | |
5063ce15 RW |
1685 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1686 | if (link->slave != subdomain) | |
f721889f RW |
1687 | continue; |
1688 | ||
1689 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1690 | ||
17b75eca RW |
1691 | if (subdomain->status != GPD_STATE_POWER_OFF |
1692 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1693 | mutex_unlock(&subdomain->lock); | |
1694 | genpd_release_lock(genpd); | |
1695 | goto start; | |
1696 | } | |
1697 | ||
5063ce15 RW |
1698 | list_del(&link->master_node); |
1699 | list_del(&link->slave_node); | |
1700 | kfree(link); | |
17b75eca | 1701 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1702 | genpd_sd_counter_dec(genpd); |
1703 | ||
1704 | mutex_unlock(&subdomain->lock); | |
1705 | ||
1706 | ret = 0; | |
1707 | break; | |
1708 | } | |
1709 | ||
17b75eca | 1710 | genpd_release_lock(genpd); |
f721889f RW |
1711 | |
1712 | return ret; | |
1713 | } | |
1714 | ||
40114447 RW |
1715 | /** |
1716 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1717 | * @genpd: PM domain to be connected with cpuidle. | |
1718 | * @state: cpuidle state this domain can disable/enable. | |
1719 | * | |
1720 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1721 | * of calling its power down routine it will enable the given cpuidle state so | |
1722 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1723 | */ | |
1724 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1725 | { |
1726 | struct cpuidle_driver *cpuidle_drv; | |
f39cb179 | 1727 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1728 | struct cpuidle_state *idle_state; |
1729 | int ret = 0; | |
1730 | ||
1731 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1732 | return -EINVAL; | |
1733 | ||
1734 | genpd_acquire_lock(genpd); | |
1735 | ||
f39cb179 | 1736 | if (genpd->cpuidle_data) { |
cbc9ef02 RW |
1737 | ret = -EEXIST; |
1738 | goto out; | |
1739 | } | |
f39cb179 UH |
1740 | cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); |
1741 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1742 | ret = -ENOMEM; |
1743 | goto out; | |
1744 | } | |
1745 | cpuidle_drv = cpuidle_driver_ref(); | |
1746 | if (!cpuidle_drv) { | |
1747 | ret = -ENODEV; | |
debe081a | 1748 | goto err_drv; |
cbc9ef02 RW |
1749 | } |
1750 | if (cpuidle_drv->state_count <= state) { | |
1751 | ret = -EINVAL; | |
1752 | goto err; | |
1753 | } | |
1754 | idle_state = &cpuidle_drv->states[state]; | |
1755 | if (!idle_state->disabled) { | |
1756 | ret = -EAGAIN; | |
1757 | goto err; | |
1758 | } | |
f39cb179 UH |
1759 | cpuidle_data->idle_state = idle_state; |
1760 | cpuidle_data->saved_exit_latency = idle_state->exit_latency; | |
1761 | genpd->cpuidle_data = cpuidle_data; | |
cbc9ef02 RW |
1762 | genpd_recalc_cpu_exit_latency(genpd); |
1763 | ||
1764 | out: | |
1765 | genpd_release_lock(genpd); | |
1766 | return ret; | |
1767 | ||
1768 | err: | |
1769 | cpuidle_driver_unref(); | |
debe081a | 1770 | |
1771 | err_drv: | |
f39cb179 | 1772 | kfree(cpuidle_data); |
cbc9ef02 RW |
1773 | goto out; |
1774 | } | |
1775 | ||
74a2799a RW |
1776 | /** |
1777 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1778 | * @name: Name of the domain to connect to cpuidle. | |
1779 | * @state: cpuidle state this domain can manipulate. | |
1780 | */ | |
1781 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1782 | { | |
1783 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1784 | } | |
1785 | ||
40114447 RW |
1786 | /** |
1787 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1788 | * @genpd: PM domain to remove the cpuidle connection from. | |
1789 | * | |
1790 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1791 | * given PM domain. | |
1792 | */ | |
1793 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 | 1794 | { |
f39cb179 | 1795 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1796 | struct cpuidle_state *idle_state; |
1797 | int ret = 0; | |
1798 | ||
1799 | if (IS_ERR_OR_NULL(genpd)) | |
1800 | return -EINVAL; | |
1801 | ||
1802 | genpd_acquire_lock(genpd); | |
1803 | ||
f39cb179 UH |
1804 | cpuidle_data = genpd->cpuidle_data; |
1805 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1806 | ret = -ENODEV; |
1807 | goto out; | |
1808 | } | |
f39cb179 | 1809 | idle_state = cpuidle_data->idle_state; |
cbc9ef02 RW |
1810 | if (!idle_state->disabled) { |
1811 | ret = -EAGAIN; | |
1812 | goto out; | |
1813 | } | |
f39cb179 | 1814 | idle_state->exit_latency = cpuidle_data->saved_exit_latency; |
cbc9ef02 | 1815 | cpuidle_driver_unref(); |
f39cb179 UH |
1816 | genpd->cpuidle_data = NULL; |
1817 | kfree(cpuidle_data); | |
cbc9ef02 RW |
1818 | |
1819 | out: | |
1820 | genpd_release_lock(genpd); | |
1821 | return ret; | |
1822 | } | |
1823 | ||
74a2799a RW |
1824 | /** |
1825 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1826 | * @name: Name of the domain to disconnect cpuidle from. | |
1827 | */ | |
1828 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1829 | { | |
1830 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1831 | } | |
1832 | ||
d23b9b00 RW |
1833 | /* Default device callbacks for generic PM domains. */ |
1834 | ||
ecf00475 | 1835 | /** |
12e10bb6 | 1836 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1837 | * @dev: Device to handle. |
1838 | */ | |
1839 | static int pm_genpd_default_save_state(struct device *dev) | |
1840 | { | |
1841 | int (*cb)(struct device *__dev); | |
ecf00475 | 1842 | |
0b589741 RW |
1843 | if (dev->type && dev->type->pm) |
1844 | cb = dev->type->pm->runtime_suspend; | |
1845 | else if (dev->class && dev->class->pm) | |
1846 | cb = dev->class->pm->runtime_suspend; | |
1847 | else if (dev->bus && dev->bus->pm) | |
1848 | cb = dev->bus->pm->runtime_suspend; | |
1849 | else | |
1850 | cb = NULL; | |
ecf00475 | 1851 | |
0b589741 RW |
1852 | if (!cb && dev->driver && dev->driver->pm) |
1853 | cb = dev->driver->pm->runtime_suspend; | |
1854 | ||
1855 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1856 | } |
1857 | ||
1858 | /** | |
12e10bb6 | 1859 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1860 | * @dev: Device to handle. |
1861 | */ | |
1862 | static int pm_genpd_default_restore_state(struct device *dev) | |
1863 | { | |
1864 | int (*cb)(struct device *__dev); | |
ecf00475 | 1865 | |
0b589741 RW |
1866 | if (dev->type && dev->type->pm) |
1867 | cb = dev->type->pm->runtime_resume; | |
1868 | else if (dev->class && dev->class->pm) | |
1869 | cb = dev->class->pm->runtime_resume; | |
1870 | else if (dev->bus && dev->bus->pm) | |
1871 | cb = dev->bus->pm->runtime_resume; | |
1872 | else | |
1873 | cb = NULL; | |
ecf00475 | 1874 | |
0b589741 RW |
1875 | if (!cb && dev->driver && dev->driver->pm) |
1876 | cb = dev->driver->pm->runtime_resume; | |
1877 | ||
1878 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1879 | } |
1880 | ||
f721889f RW |
1881 | /** |
1882 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1883 | * @genpd: PM domain object to initialize. | |
1884 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1885 | * @is_off: Initial value of the domain's power_is_off field. | |
1886 | */ | |
1887 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1888 | struct dev_power_governor *gov, bool is_off) | |
1889 | { | |
1890 | if (IS_ERR_OR_NULL(genpd)) | |
1891 | return; | |
1892 | ||
5063ce15 RW |
1893 | INIT_LIST_HEAD(&genpd->master_links); |
1894 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1895 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1896 | mutex_init(&genpd->lock); |
1897 | genpd->gov = gov; | |
1898 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1899 | genpd->in_progress = 0; | |
c4bb3160 | 1900 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1901 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1902 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1903 | genpd->poweroff_task = NULL; |
1904 | genpd->resume_count = 0; | |
596ba34b | 1905 | genpd->device_count = 0; |
221e9b58 | 1906 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1907 | genpd->max_off_time_changed = true; |
f721889f RW |
1908 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1909 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1910 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1911 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1912 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1913 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1914 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1915 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1916 | genpd->domain.ops.resume = pm_genpd_resume; |
1917 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1918 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1919 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1920 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1921 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1922 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1923 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1924 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1925 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1926 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1927 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1928 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1929 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1930 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1931 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1932 | |
1933 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1934 | genpd->dev_ops.stop = pm_clk_suspend; | |
1935 | genpd->dev_ops.start = pm_clk_resume; | |
1936 | } | |
1937 | ||
5125bbf3 RW |
1938 | mutex_lock(&gpd_list_lock); |
1939 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1940 | mutex_unlock(&gpd_list_lock); | |
1941 | } | |
aa42240a TF |
1942 | |
1943 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1944 | /* | |
1945 | * Device Tree based PM domain providers. | |
1946 | * | |
1947 | * The code below implements generic device tree based PM domain providers that | |
1948 | * bind device tree nodes with generic PM domains registered in the system. | |
1949 | * | |
1950 | * Any driver that registers generic PM domains and needs to support binding of | |
1951 | * devices to these domains is supposed to register a PM domain provider, which | |
1952 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1953 | * | |
1954 | * Two simple mapping functions have been provided for convenience: | |
1955 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1956 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1957 | * index. | |
1958 | */ | |
1959 | ||
1960 | /** | |
1961 | * struct of_genpd_provider - PM domain provider registration structure | |
1962 | * @link: Entry in global list of PM domain providers | |
1963 | * @node: Pointer to device tree node of PM domain provider | |
1964 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1965 | * into a PM domain. | |
1966 | * @data: context pointer to be passed into @xlate callback | |
1967 | */ | |
1968 | struct of_genpd_provider { | |
1969 | struct list_head link; | |
1970 | struct device_node *node; | |
1971 | genpd_xlate_t xlate; | |
1972 | void *data; | |
1973 | }; | |
1974 | ||
1975 | /* List of registered PM domain providers. */ | |
1976 | static LIST_HEAD(of_genpd_providers); | |
1977 | /* Mutex to protect the list above. */ | |
1978 | static DEFINE_MUTEX(of_genpd_mutex); | |
1979 | ||
1980 | /** | |
1981 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1982 | * @genpdspec: OF phandle args to map into a PM domain | |
1983 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1984 | * | |
1985 | * This is a generic xlate function that can be used to model PM domains that | |
1986 | * have their own device tree nodes. The private data of xlate function needs | |
1987 | * to be a valid pointer to struct generic_pm_domain. | |
1988 | */ | |
1989 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1990 | struct of_phandle_args *genpdspec, | |
1991 | void *data) | |
1992 | { | |
1993 | if (genpdspec->args_count != 0) | |
1994 | return ERR_PTR(-EINVAL); | |
1995 | return data; | |
1996 | } | |
1997 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1998 | ||
1999 | /** | |
2000 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
2001 | * @genpdspec: OF phandle args to map into a PM domain | |
2002 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2003 | * | |
2004 | * This is a generic xlate function that can be used to model simple PM domain | |
2005 | * controllers that have one device tree node and provide multiple PM domains. | |
2006 | * A single cell is used as an index into an array of PM domains specified in | |
2007 | * the genpd_onecell_data struct when registering the provider. | |
2008 | */ | |
2009 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
2010 | struct of_phandle_args *genpdspec, | |
2011 | void *data) | |
2012 | { | |
2013 | struct genpd_onecell_data *genpd_data = data; | |
2014 | unsigned int idx = genpdspec->args[0]; | |
2015 | ||
2016 | if (genpdspec->args_count != 1) | |
2017 | return ERR_PTR(-EINVAL); | |
2018 | ||
2019 | if (idx >= genpd_data->num_domains) { | |
2020 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2021 | return ERR_PTR(-EINVAL); | |
2022 | } | |
2023 | ||
2024 | if (!genpd_data->domains[idx]) | |
2025 | return ERR_PTR(-ENOENT); | |
2026 | ||
2027 | return genpd_data->domains[idx]; | |
2028 | } | |
2029 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
2030 | ||
2031 | /** | |
2032 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
2033 | * @np: Device node pointer associated with the PM domain provider. | |
2034 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2035 | * @data: Context pointer for @xlate callback. | |
2036 | */ | |
2037 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
2038 | void *data) | |
2039 | { | |
2040 | struct of_genpd_provider *cp; | |
2041 | ||
2042 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2043 | if (!cp) | |
2044 | return -ENOMEM; | |
2045 | ||
2046 | cp->node = of_node_get(np); | |
2047 | cp->data = data; | |
2048 | cp->xlate = xlate; | |
2049 | ||
2050 | mutex_lock(&of_genpd_mutex); | |
2051 | list_add(&cp->link, &of_genpd_providers); | |
2052 | mutex_unlock(&of_genpd_mutex); | |
2053 | pr_debug("Added domain provider from %s\n", np->full_name); | |
2054 | ||
2055 | return 0; | |
2056 | } | |
2057 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
2058 | ||
2059 | /** | |
2060 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2061 | * @np: Device node pointer associated with the PM domain provider | |
2062 | */ | |
2063 | void of_genpd_del_provider(struct device_node *np) | |
2064 | { | |
2065 | struct of_genpd_provider *cp; | |
2066 | ||
2067 | mutex_lock(&of_genpd_mutex); | |
2068 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
2069 | if (cp->node == np) { | |
2070 | list_del(&cp->link); | |
2071 | of_node_put(cp->node); | |
2072 | kfree(cp); | |
2073 | break; | |
2074 | } | |
2075 | } | |
2076 | mutex_unlock(&of_genpd_mutex); | |
2077 | } | |
2078 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2079 | ||
2080 | /** | |
2081 | * of_genpd_get_from_provider() - Look-up PM domain | |
2082 | * @genpdspec: OF phandle args to use for look-up | |
2083 | * | |
2084 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2085 | * found, uses xlate function of the provider to map phandle args to a PM | |
2086 | * domain. | |
2087 | * | |
2088 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2089 | * on failure. | |
2090 | */ | |
7496fcbe | 2091 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
2092 | struct of_phandle_args *genpdspec) |
2093 | { | |
2094 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2095 | struct of_genpd_provider *provider; | |
2096 | ||
2097 | mutex_lock(&of_genpd_mutex); | |
2098 | ||
2099 | /* Check if we have such a provider in our array */ | |
2100 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2101 | if (provider->node == genpdspec->np) | |
2102 | genpd = provider->xlate(genpdspec, provider->data); | |
2103 | if (!IS_ERR(genpd)) | |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | mutex_unlock(&of_genpd_mutex); | |
2108 | ||
2109 | return genpd; | |
2110 | } | |
7496fcbe | 2111 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
2112 | |
2113 | /** | |
2114 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
2115 | * @dev: Device to attach. | |
2116 | * @power_off: Currently not used | |
2117 | * | |
2118 | * Try to locate a corresponding generic PM domain, which the device was | |
2119 | * attached to previously. If such is found, the device is detached from it. | |
2120 | */ | |
2121 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2122 | { | |
446d999c | 2123 | struct generic_pm_domain *pd; |
aa42240a TF |
2124 | int ret = 0; |
2125 | ||
446d999c | 2126 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
2127 | if (!pd) |
2128 | return; | |
2129 | ||
2130 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2131 | ||
2132 | while (1) { | |
2133 | ret = pm_genpd_remove_device(pd, dev); | |
2134 | if (ret != -EAGAIN) | |
2135 | break; | |
2136 | cond_resched(); | |
2137 | } | |
2138 | ||
2139 | if (ret < 0) { | |
2140 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2141 | pd->name, ret); | |
2142 | return; | |
2143 | } | |
2144 | ||
2145 | /* Check if PM domain can be powered off after removing this device. */ | |
2146 | genpd_queue_power_off_work(pd); | |
2147 | } | |
2148 | ||
632f7ce3 RK |
2149 | static void genpd_dev_pm_sync(struct device *dev) |
2150 | { | |
2151 | struct generic_pm_domain *pd; | |
2152 | ||
2153 | pd = dev_to_genpd(dev); | |
2154 | if (IS_ERR(pd)) | |
2155 | return; | |
2156 | ||
2157 | genpd_queue_power_off_work(pd); | |
2158 | } | |
2159 | ||
aa42240a TF |
2160 | /** |
2161 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2162 | * @dev: Device to attach. | |
2163 | * | |
2164 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2165 | * attaches the device to retrieved pm_domain ops. | |
2166 | * | |
2167 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2168 | * backwards compatibility with existing DTBs. | |
2169 | * | |
2170 | * Returns 0 on successfully attached PM domain or negative error code. | |
2171 | */ | |
2172 | int genpd_dev_pm_attach(struct device *dev) | |
2173 | { | |
2174 | struct of_phandle_args pd_args; | |
2175 | struct generic_pm_domain *pd; | |
2176 | int ret; | |
2177 | ||
2178 | if (!dev->of_node) | |
2179 | return -ENODEV; | |
2180 | ||
2181 | if (dev->pm_domain) | |
2182 | return -EEXIST; | |
2183 | ||
2184 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2185 | "#power-domain-cells", 0, &pd_args); | |
2186 | if (ret < 0) { | |
2187 | if (ret != -ENOENT) | |
2188 | return ret; | |
2189 | ||
2190 | /* | |
2191 | * Try legacy Samsung-specific bindings | |
2192 | * (for backwards compatibility of DT ABI) | |
2193 | */ | |
2194 | pd_args.args_count = 0; | |
2195 | pd_args.np = of_parse_phandle(dev->of_node, | |
2196 | "samsung,power-domain", 0); | |
2197 | if (!pd_args.np) | |
2198 | return -ENOENT; | |
2199 | } | |
2200 | ||
2201 | pd = of_genpd_get_from_provider(&pd_args); | |
2202 | if (IS_ERR(pd)) { | |
2203 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
2204 | __func__, PTR_ERR(pd)); | |
2205 | of_node_put(dev->of_node); | |
2206 | return PTR_ERR(pd); | |
2207 | } | |
2208 | ||
2209 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2210 | ||
2211 | while (1) { | |
2212 | ret = pm_genpd_add_device(pd, dev); | |
2213 | if (ret != -EAGAIN) | |
2214 | break; | |
2215 | cond_resched(); | |
2216 | } | |
2217 | ||
2218 | if (ret < 0) { | |
2219 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2220 | pd->name, ret); | |
2221 | of_node_put(dev->of_node); | |
2222 | return ret; | |
2223 | } | |
2224 | ||
2225 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2226 | dev->pm_domain->sync = genpd_dev_pm_sync; |
2ed12769 | 2227 | pm_genpd_poweron(pd); |
aa42240a TF |
2228 | |
2229 | return 0; | |
2230 | } | |
2231 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 2232 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2233 | |
2234 | ||
2235 | /*** debugfs support ***/ | |
2236 | ||
2237 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2238 | #include <linux/pm.h> | |
2239 | #include <linux/device.h> | |
2240 | #include <linux/debugfs.h> | |
2241 | #include <linux/seq_file.h> | |
2242 | #include <linux/init.h> | |
2243 | #include <linux/kobject.h> | |
2244 | static struct dentry *pm_genpd_debugfs_dir; | |
2245 | ||
2246 | /* | |
2247 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2248 | * from sysfs.c, so generalize it. |
2bd5306a | 2249 | */ |
2bd5306a MM |
2250 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2251 | { | |
2252 | static const char * const status_lookup[] = { | |
2253 | [RPM_ACTIVE] = "active", | |
2254 | [RPM_RESUMING] = "resuming", | |
2255 | [RPM_SUSPENDED] = "suspended", | |
2256 | [RPM_SUSPENDING] = "suspending" | |
2257 | }; | |
2258 | const char *p = ""; | |
2259 | ||
2260 | if (dev->power.runtime_error) | |
2261 | p = "error"; | |
2262 | else if (dev->power.disable_depth) | |
2263 | p = "unsupported"; | |
2264 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2265 | p = status_lookup[dev->power.runtime_status]; | |
2266 | else | |
2267 | WARN_ON(1); | |
2268 | ||
2269 | seq_puts(s, p); | |
2270 | } | |
2bd5306a MM |
2271 | |
2272 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2273 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2274 | { |
2275 | static const char * const status_lookup[] = { | |
2276 | [GPD_STATE_ACTIVE] = "on", | |
2277 | [GPD_STATE_WAIT_MASTER] = "wait-master", | |
2278 | [GPD_STATE_BUSY] = "busy", | |
2279 | [GPD_STATE_REPEAT] = "off-in-progress", | |
2280 | [GPD_STATE_POWER_OFF] = "off" | |
2281 | }; | |
2282 | struct pm_domain_data *pm_data; | |
2283 | const char *kobj_path; | |
2284 | struct gpd_link *link; | |
2285 | int ret; | |
2286 | ||
66a5ca4b | 2287 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
2288 | if (ret) |
2289 | return -ERESTARTSYS; | |
2290 | ||
66a5ca4b | 2291 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2292 | goto exit; |
66a5ca4b | 2293 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
2294 | |
2295 | /* | |
2296 | * Modifications on the list require holding locks on both | |
2297 | * master and slave, so we are safe. | |
66a5ca4b | 2298 | * Also genpd->name is immutable. |
2bd5306a | 2299 | */ |
66a5ca4b | 2300 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2301 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2302 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2303 | seq_puts(s, ", "); |
2304 | } | |
2305 | ||
66a5ca4b | 2306 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
2307 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
2308 | if (kobj_path == NULL) | |
2309 | continue; | |
2310 | ||
2311 | seq_printf(s, "\n %-50s ", kobj_path); | |
2312 | rtpm_status_str(s, pm_data->dev); | |
2313 | kfree(kobj_path); | |
2314 | } | |
2315 | ||
2316 | seq_puts(s, "\n"); | |
2317 | exit: | |
66a5ca4b | 2318 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
2319 | |
2320 | return 0; | |
2321 | } | |
2322 | ||
2323 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2324 | { | |
66a5ca4b | 2325 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2326 | int ret = 0; |
2327 | ||
2328 | seq_puts(s, " domain status slaves\n"); | |
2329 | seq_puts(s, " /device runtime status\n"); | |
2330 | seq_puts(s, "----------------------------------------------------------------------\n"); | |
2331 | ||
2332 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2333 | if (ret) | |
2334 | return -ERESTARTSYS; | |
2335 | ||
66a5ca4b KH |
2336 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2337 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2338 | if (ret) |
2339 | break; | |
2340 | } | |
2341 | mutex_unlock(&gpd_list_lock); | |
2342 | ||
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2347 | { | |
2348 | return single_open(file, pm_genpd_summary_show, NULL); | |
2349 | } | |
2350 | ||
2351 | static const struct file_operations pm_genpd_summary_fops = { | |
2352 | .open = pm_genpd_summary_open, | |
2353 | .read = seq_read, | |
2354 | .llseek = seq_lseek, | |
2355 | .release = single_release, | |
2356 | }; | |
2357 | ||
2358 | static int __init pm_genpd_debug_init(void) | |
2359 | { | |
2360 | struct dentry *d; | |
2361 | ||
2362 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2363 | ||
2364 | if (!pm_genpd_debugfs_dir) | |
2365 | return -ENOMEM; | |
2366 | ||
2367 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2368 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2369 | if (!d) | |
2370 | return -ENOMEM; | |
2371 | ||
2372 | return 0; | |
2373 | } | |
2374 | late_initcall(pm_genpd_debug_init); | |
2375 | ||
2376 | static void __exit pm_genpd_debug_exit(void) | |
2377 | { | |
2378 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2379 | } | |
2380 | __exitcall(pm_genpd_debug_exit); | |
2381 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |