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> |
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 | ||
b02c999a | 71 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
5248051b RW |
72 | { |
73 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
74 | return ERR_PTR(-EINVAL); | |
75 | ||
596ba34b | 76 | return pd_to_genpd(dev->pm_domain); |
5248051b | 77 | } |
f721889f | 78 | |
d5e4cbfe RW |
79 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
80 | { | |
0140d8bd RW |
81 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
82 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
83 | } |
84 | ||
85 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) | |
86 | { | |
0140d8bd RW |
87 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
88 | start_latency_ns, "start"); | |
d5e4cbfe RW |
89 | } |
90 | ||
c4bb3160 | 91 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 92 | { |
c4bb3160 RW |
93 | bool ret = false; |
94 | ||
95 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
96 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
102 | { | |
103 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 104 | smp_mb__after_atomic(); |
f721889f RW |
105 | } |
106 | ||
17b75eca RW |
107 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
108 | { | |
109 | DEFINE_WAIT(wait); | |
110 | ||
111 | mutex_lock(&genpd->lock); | |
112 | /* | |
113 | * Wait for the domain to transition into either the active, | |
114 | * or the power off state. | |
115 | */ | |
116 | for (;;) { | |
117 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
118 | TASK_UNINTERRUPTIBLE); | |
c6d22b37 RW |
119 | if (genpd->status == GPD_STATE_ACTIVE |
120 | || genpd->status == GPD_STATE_POWER_OFF) | |
17b75eca RW |
121 | break; |
122 | mutex_unlock(&genpd->lock); | |
123 | ||
124 | schedule(); | |
125 | ||
126 | mutex_lock(&genpd->lock); | |
127 | } | |
128 | finish_wait(&genpd->status_wait_queue, &wait); | |
129 | } | |
130 | ||
131 | static void genpd_release_lock(struct generic_pm_domain *genpd) | |
132 | { | |
133 | mutex_unlock(&genpd->lock); | |
134 | } | |
135 | ||
c6d22b37 RW |
136 | static void genpd_set_active(struct generic_pm_domain *genpd) |
137 | { | |
138 | if (genpd->resume_count == 0) | |
139 | genpd->status = GPD_STATE_ACTIVE; | |
140 | } | |
141 | ||
cbc9ef02 RW |
142 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
143 | { | |
144 | s64 usecs64; | |
145 | ||
f39cb179 | 146 | if (!genpd->cpuidle_data) |
cbc9ef02 RW |
147 | return; |
148 | ||
149 | usecs64 = genpd->power_on_latency_ns; | |
150 | do_div(usecs64, NSEC_PER_USEC); | |
f39cb179 UH |
151 | usecs64 += genpd->cpuidle_data->saved_exit_latency; |
152 | genpd->cpuidle_data->idle_state->exit_latency = usecs64; | |
cbc9ef02 RW |
153 | } |
154 | ||
c8f0ea45 GU |
155 | static int genpd_power_on(struct generic_pm_domain *genpd) |
156 | { | |
157 | ktime_t time_start; | |
158 | s64 elapsed_ns; | |
159 | int ret; | |
160 | ||
161 | if (!genpd->power_on) | |
162 | return 0; | |
163 | ||
164 | time_start = ktime_get(); | |
165 | ret = genpd->power_on(genpd); | |
166 | if (ret) | |
167 | return ret; | |
168 | ||
169 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
170 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
171 | return ret; | |
172 | ||
173 | genpd->power_on_latency_ns = elapsed_ns; | |
174 | genpd->max_off_time_changed = true; | |
175 | genpd_recalc_cpu_exit_latency(genpd); | |
176 | pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n", | |
177 | genpd->name, "on", elapsed_ns); | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | static int genpd_power_off(struct generic_pm_domain *genpd) | |
183 | { | |
184 | ktime_t time_start; | |
185 | s64 elapsed_ns; | |
186 | int ret; | |
187 | ||
188 | if (!genpd->power_off) | |
189 | return 0; | |
190 | ||
191 | time_start = ktime_get(); | |
192 | ret = genpd->power_off(genpd); | |
193 | if (ret == -EBUSY) | |
194 | return ret; | |
195 | ||
196 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
197 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
198 | return ret; | |
199 | ||
200 | genpd->power_off_latency_ns = elapsed_ns; | |
201 | genpd->max_off_time_changed = true; | |
202 | pr_warn("%s: Power-%s latency exceeded, new value %lld ns\n", | |
203 | genpd->name, "off", elapsed_ns); | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
5248051b | 208 | /** |
5063ce15 | 209 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
210 | * @genpd: PM domain to power up. |
211 | * | |
5063ce15 | 212 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
213 | * resume a device belonging to it. |
214 | */ | |
8951ef02 | 215 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 | 216 | __releases(&genpd->lock) __acquires(&genpd->lock) |
5248051b | 217 | { |
5063ce15 | 218 | struct gpd_link *link; |
3f241775 | 219 | DEFINE_WAIT(wait); |
5248051b RW |
220 | int ret = 0; |
221 | ||
5063ce15 | 222 | /* If the domain's master is being waited for, we have to wait too. */ |
3f241775 RW |
223 | for (;;) { |
224 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
225 | TASK_UNINTERRUPTIBLE); | |
17877eb5 | 226 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
3f241775 RW |
227 | break; |
228 | mutex_unlock(&genpd->lock); | |
17b75eca | 229 | |
3f241775 RW |
230 | schedule(); |
231 | ||
232 | mutex_lock(&genpd->lock); | |
233 | } | |
234 | finish_wait(&genpd->status_wait_queue, &wait); | |
9e08cf42 | 235 | |
17b75eca | 236 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 237 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 238 | return 0; |
5248051b | 239 | |
c6d22b37 RW |
240 | if (genpd->status != GPD_STATE_POWER_OFF) { |
241 | genpd_set_active(genpd); | |
3f241775 | 242 | return 0; |
c6d22b37 RW |
243 | } |
244 | ||
f39cb179 | 245 | if (genpd->cpuidle_data) { |
cbc9ef02 | 246 | cpuidle_pause_and_lock(); |
f39cb179 | 247 | genpd->cpuidle_data->idle_state->disabled = true; |
cbc9ef02 RW |
248 | cpuidle_resume_and_unlock(); |
249 | goto out; | |
250 | } | |
251 | ||
5063ce15 RW |
252 | /* |
253 | * The list is guaranteed not to change while the loop below is being | |
254 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
255 | * with it. | |
256 | */ | |
257 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
258 | genpd_sd_counter_inc(link->master); | |
17877eb5 | 259 | genpd->status = GPD_STATE_WAIT_MASTER; |
3c07cbc4 | 260 | |
5248051b | 261 | mutex_unlock(&genpd->lock); |
5248051b | 262 | |
5063ce15 | 263 | ret = pm_genpd_poweron(link->master); |
9e08cf42 RW |
264 | |
265 | mutex_lock(&genpd->lock); | |
266 | ||
3f241775 RW |
267 | /* |
268 | * The "wait for parent" status is guaranteed not to change | |
5063ce15 | 269 | * while the master is powering on. |
3f241775 RW |
270 | */ |
271 | genpd->status = GPD_STATE_POWER_OFF; | |
272 | wake_up_all(&genpd->status_wait_queue); | |
5063ce15 RW |
273 | if (ret) { |
274 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 275 | goto err; |
5063ce15 | 276 | } |
5248051b RW |
277 | } |
278 | ||
c8f0ea45 GU |
279 | ret = genpd_power_on(genpd); |
280 | if (ret) | |
281 | goto err; | |
5248051b | 282 | |
cbc9ef02 | 283 | out: |
9e08cf42 RW |
284 | genpd_set_active(genpd); |
285 | ||
3f241775 | 286 | return 0; |
9e08cf42 RW |
287 | |
288 | err: | |
5063ce15 RW |
289 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
290 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 291 | |
3f241775 RW |
292 | return ret; |
293 | } | |
294 | ||
295 | /** | |
5063ce15 | 296 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
297 | * @genpd: PM domain to power up. |
298 | */ | |
299 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
300 | { | |
301 | int ret; | |
302 | ||
303 | mutex_lock(&genpd->lock); | |
304 | ret = __pm_genpd_poweron(genpd); | |
305 | mutex_unlock(&genpd->lock); | |
306 | return ret; | |
5248051b RW |
307 | } |
308 | ||
8bc0251d RW |
309 | /** |
310 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
311 | * @domain_name: Name of the PM domain to power up. | |
312 | */ | |
313 | int pm_genpd_name_poweron(const char *domain_name) | |
314 | { | |
315 | struct generic_pm_domain *genpd; | |
316 | ||
317 | genpd = pm_genpd_lookup_name(domain_name); | |
318 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
319 | } | |
320 | ||
b3d3b9fb SK |
321 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
322 | struct device *dev) | |
323 | { | |
324 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
325 | } | |
326 | ||
8e9afafd RW |
327 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
328 | { | |
329 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
330 | save_state_latency_ns, "state save"); | |
331 | } | |
332 | ||
333 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
334 | { | |
335 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
336 | restore_state_latency_ns, | |
337 | "state restore"); | |
338 | } | |
339 | ||
6ff7bb0d RW |
340 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
341 | unsigned long val, void *ptr) | |
342 | { | |
343 | struct generic_pm_domain_data *gpd_data; | |
344 | struct device *dev; | |
345 | ||
346 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
347 | ||
348 | mutex_lock(&gpd_data->lock); | |
349 | dev = gpd_data->base.dev; | |
350 | if (!dev) { | |
351 | mutex_unlock(&gpd_data->lock); | |
352 | return NOTIFY_DONE; | |
353 | } | |
354 | mutex_unlock(&gpd_data->lock); | |
355 | ||
356 | for (;;) { | |
357 | struct generic_pm_domain *genpd; | |
358 | struct pm_domain_data *pdd; | |
359 | ||
360 | spin_lock_irq(&dev->power.lock); | |
361 | ||
362 | pdd = dev->power.subsys_data ? | |
363 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 364 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
365 | to_gpd_data(pdd)->td.constraint_changed = true; |
366 | genpd = dev_to_genpd(dev); | |
367 | } else { | |
368 | genpd = ERR_PTR(-ENODATA); | |
369 | } | |
370 | ||
371 | spin_unlock_irq(&dev->power.lock); | |
372 | ||
373 | if (!IS_ERR(genpd)) { | |
374 | mutex_lock(&genpd->lock); | |
375 | genpd->max_off_time_changed = true; | |
376 | mutex_unlock(&genpd->lock); | |
377 | } | |
378 | ||
379 | dev = dev->parent; | |
380 | if (!dev || dev->power.ignore_children) | |
381 | break; | |
382 | } | |
383 | ||
384 | return NOTIFY_DONE; | |
385 | } | |
386 | ||
f721889f RW |
387 | /** |
388 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 389 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
390 | * @genpd: PM domain the device belongs to. |
391 | */ | |
4605ab65 | 392 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 393 | struct generic_pm_domain *genpd) |
17b75eca | 394 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 395 | { |
cd0ea672 | 396 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 397 | struct device *dev = pdd->dev; |
f721889f RW |
398 | int ret = 0; |
399 | ||
67732cd3 | 400 | if (gpd_data->need_restore > 0) |
f721889f RW |
401 | return 0; |
402 | ||
67732cd3 UH |
403 | /* |
404 | * If the value of the need_restore flag is still unknown at this point, | |
405 | * we trust that pm_genpd_poweroff() has verified that the device is | |
406 | * already runtime PM suspended. | |
407 | */ | |
408 | if (gpd_data->need_restore < 0) { | |
409 | gpd_data->need_restore = 1; | |
410 | return 0; | |
411 | } | |
412 | ||
17b75eca RW |
413 | mutex_unlock(&genpd->lock); |
414 | ||
ecf00475 RW |
415 | genpd_start_dev(genpd, dev); |
416 | ret = genpd_save_dev(genpd, dev); | |
417 | genpd_stop_dev(genpd, dev); | |
f721889f | 418 | |
17b75eca RW |
419 | mutex_lock(&genpd->lock); |
420 | ||
f721889f | 421 | if (!ret) |
67732cd3 | 422 | gpd_data->need_restore = 1; |
f721889f RW |
423 | |
424 | return ret; | |
425 | } | |
426 | ||
427 | /** | |
428 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 429 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
430 | * @genpd: PM domain the device belongs to. |
431 | */ | |
4605ab65 | 432 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 433 | struct generic_pm_domain *genpd) |
17b75eca | 434 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 435 | { |
cd0ea672 | 436 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 437 | struct device *dev = pdd->dev; |
67732cd3 | 438 | int need_restore = gpd_data->need_restore; |
f721889f | 439 | |
67732cd3 | 440 | gpd_data->need_restore = 0; |
17b75eca RW |
441 | mutex_unlock(&genpd->lock); |
442 | ||
ecf00475 | 443 | genpd_start_dev(genpd, dev); |
67732cd3 UH |
444 | |
445 | /* | |
446 | * Call genpd_restore_dev() for recently added devices too (need_restore | |
447 | * is negative then). | |
448 | */ | |
80de3d7f RW |
449 | if (need_restore) |
450 | genpd_restore_dev(genpd, dev); | |
f721889f | 451 | |
17b75eca | 452 | mutex_lock(&genpd->lock); |
f721889f RW |
453 | } |
454 | ||
c6d22b37 RW |
455 | /** |
456 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
457 | * @genpd: PM domain to check. | |
458 | * | |
459 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
460 | * a "power off" operation, which means that a "power on" has occured in the | |
461 | * meantime, or if its resume_count field is different from zero, which means | |
462 | * that one of its devices has been resumed in the meantime. | |
463 | */ | |
464 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
465 | { | |
17877eb5 | 466 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 467 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
468 | } |
469 | ||
56375fd4 RW |
470 | /** |
471 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
472 | * @genpd: PM domait to power off. | |
473 | * | |
474 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
475 | * before. | |
476 | */ | |
d971f0b0 | 477 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 478 | { |
a4ca26a4 | 479 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
480 | } |
481 | ||
f721889f RW |
482 | /** |
483 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
484 | * @genpd: PM domain to power down. | |
485 | * | |
486 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
487 | * have been powered down, run the runtime suspend callbacks provided by all of | |
488 | * the @genpd's devices' drivers and remove power from @genpd. | |
489 | */ | |
490 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 491 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 492 | { |
4605ab65 | 493 | struct pm_domain_data *pdd; |
5063ce15 | 494 | struct gpd_link *link; |
f721889f | 495 | unsigned int not_suspended; |
c6d22b37 | 496 | int ret = 0; |
f721889f | 497 | |
c6d22b37 RW |
498 | start: |
499 | /* | |
500 | * Do not try to power off the domain in the following situations: | |
501 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 502 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 503 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 504 | * (4) System suspend is in progress. |
c6d22b37 | 505 | */ |
3f241775 | 506 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 507 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 508 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
509 | return 0; |
510 | ||
c4bb3160 | 511 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
512 | return -EBUSY; |
513 | ||
514 | not_suspended = 0; | |
34b1f762 RW |
515 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
516 | enum pm_qos_flags_status stat; | |
517 | ||
518 | stat = dev_pm_qos_flags(pdd->dev, | |
519 | PM_QOS_FLAG_NO_POWER_OFF | |
520 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
521 | if (stat > PM_QOS_FLAGS_NONE) | |
522 | return -EBUSY; | |
523 | ||
0aa2a221 | 524 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 525 | || pdd->dev->power.irq_safe)) |
f721889f | 526 | not_suspended++; |
34b1f762 | 527 | } |
f721889f RW |
528 | |
529 | if (not_suspended > genpd->in_progress) | |
530 | return -EBUSY; | |
531 | ||
c6d22b37 RW |
532 | if (genpd->poweroff_task) { |
533 | /* | |
534 | * Another instance of pm_genpd_poweroff() is executing | |
535 | * callbacks, so tell it to start over and return. | |
536 | */ | |
537 | genpd->status = GPD_STATE_REPEAT; | |
538 | return 0; | |
539 | } | |
540 | ||
f721889f RW |
541 | if (genpd->gov && genpd->gov->power_down_ok) { |
542 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
543 | return -EAGAIN; | |
544 | } | |
545 | ||
17b75eca | 546 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 547 | genpd->poweroff_task = current; |
17b75eca | 548 | |
4605ab65 | 549 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 550 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 551 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
552 | |
553 | if (genpd_abort_poweroff(genpd)) | |
554 | goto out; | |
555 | ||
697a7f37 RW |
556 | if (ret) { |
557 | genpd_set_active(genpd); | |
558 | goto out; | |
559 | } | |
f721889f | 560 | |
c6d22b37 RW |
561 | if (genpd->status == GPD_STATE_REPEAT) { |
562 | genpd->poweroff_task = NULL; | |
563 | goto start; | |
564 | } | |
565 | } | |
17b75eca | 566 | |
f39cb179 | 567 | if (genpd->cpuidle_data) { |
cbc9ef02 | 568 | /* |
f39cb179 UH |
569 | * If cpuidle_data is set, cpuidle should turn the domain off |
570 | * when the CPU in it is idle. In that case we don't decrement | |
571 | * the subdomain counts of the master domains, so that power is | |
572 | * not removed from the current domain prematurely as a result | |
573 | * of cutting off the masters' power. | |
cbc9ef02 RW |
574 | */ |
575 | genpd->status = GPD_STATE_POWER_OFF; | |
576 | cpuidle_pause_and_lock(); | |
f39cb179 | 577 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 RW |
578 | cpuidle_resume_and_unlock(); |
579 | goto out; | |
580 | } | |
581 | ||
3c07cbc4 RW |
582 | if (genpd->power_off) { |
583 | if (atomic_read(&genpd->sd_count) > 0) { | |
584 | ret = -EBUSY; | |
c6d22b37 RW |
585 | goto out; |
586 | } | |
17b75eca | 587 | |
3c07cbc4 | 588 | /* |
5063ce15 RW |
589 | * If sd_count > 0 at this point, one of the subdomains hasn't |
590 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
591 | * incrementing it. In that case pm_genpd_poweron() will wait |
592 | * for us to drop the lock, so we can call .power_off() and let | |
593 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
594 | * happen very often). | |
595 | */ | |
c8f0ea45 | 596 | ret = genpd_power_off(genpd); |
d2805402 RW |
597 | if (ret == -EBUSY) { |
598 | genpd_set_active(genpd); | |
d2805402 RW |
599 | goto out; |
600 | } | |
601 | } | |
f721889f | 602 | |
17b75eca | 603 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 604 | |
5063ce15 RW |
605 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
606 | genpd_sd_counter_dec(link->master); | |
607 | genpd_queue_power_off_work(link->master); | |
608 | } | |
f721889f | 609 | |
c6d22b37 RW |
610 | out: |
611 | genpd->poweroff_task = NULL; | |
612 | wake_up_all(&genpd->status_wait_queue); | |
613 | return ret; | |
f721889f RW |
614 | } |
615 | ||
616 | /** | |
617 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
618 | * @work: Work structure used for scheduling the execution of this function. | |
619 | */ | |
620 | static void genpd_power_off_work_fn(struct work_struct *work) | |
621 | { | |
622 | struct generic_pm_domain *genpd; | |
623 | ||
624 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
625 | ||
17b75eca | 626 | genpd_acquire_lock(genpd); |
f721889f | 627 | pm_genpd_poweroff(genpd); |
17b75eca | 628 | genpd_release_lock(genpd); |
f721889f RW |
629 | } |
630 | ||
631 | /** | |
632 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
633 | * @dev: Device to suspend. | |
634 | * | |
635 | * Carry out a runtime suspend of a device under the assumption that its | |
636 | * pm_domain field points to the domain member of an object of type | |
637 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
638 | */ | |
639 | static int pm_genpd_runtime_suspend(struct device *dev) | |
640 | { | |
641 | struct generic_pm_domain *genpd; | |
67732cd3 | 642 | struct generic_pm_domain_data *gpd_data; |
b02c999a | 643 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 644 | int ret; |
f721889f RW |
645 | |
646 | dev_dbg(dev, "%s()\n", __func__); | |
647 | ||
5248051b RW |
648 | genpd = dev_to_genpd(dev); |
649 | if (IS_ERR(genpd)) | |
f721889f RW |
650 | return -EINVAL; |
651 | ||
b02c999a RW |
652 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
653 | if (stop_ok && !stop_ok(dev)) | |
654 | return -EBUSY; | |
655 | ||
d5e4cbfe RW |
656 | ret = genpd_stop_dev(genpd, dev); |
657 | if (ret) | |
658 | return ret; | |
17b75eca | 659 | |
0aa2a221 RW |
660 | /* |
661 | * If power.irq_safe is set, this routine will be run with interrupts | |
662 | * off, so it can't use mutexes. | |
663 | */ | |
664 | if (dev->power.irq_safe) | |
665 | return 0; | |
666 | ||
c6d22b37 | 667 | mutex_lock(&genpd->lock); |
67732cd3 UH |
668 | |
669 | /* | |
670 | * If we have an unknown state of the need_restore flag, it means none | |
671 | * of the runtime PM callbacks has been invoked yet. Let's update the | |
672 | * flag to reflect that the current state is active. | |
673 | */ | |
674 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
675 | if (gpd_data->need_restore < 0) | |
676 | gpd_data->need_restore = 0; | |
677 | ||
f721889f RW |
678 | genpd->in_progress++; |
679 | pm_genpd_poweroff(genpd); | |
680 | genpd->in_progress--; | |
c6d22b37 | 681 | mutex_unlock(&genpd->lock); |
f721889f RW |
682 | |
683 | return 0; | |
684 | } | |
685 | ||
f721889f RW |
686 | /** |
687 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
688 | * @dev: Device to resume. | |
689 | * | |
690 | * Carry out a runtime resume of a device under the assumption that its | |
691 | * pm_domain field points to the domain member of an object of type | |
692 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
693 | */ | |
694 | static int pm_genpd_runtime_resume(struct device *dev) | |
695 | { | |
696 | struct generic_pm_domain *genpd; | |
c6d22b37 | 697 | DEFINE_WAIT(wait); |
f721889f RW |
698 | int ret; |
699 | ||
700 | dev_dbg(dev, "%s()\n", __func__); | |
701 | ||
5248051b RW |
702 | genpd = dev_to_genpd(dev); |
703 | if (IS_ERR(genpd)) | |
f721889f RW |
704 | return -EINVAL; |
705 | ||
0aa2a221 RW |
706 | /* If power.irq_safe, the PM domain is never powered off. */ |
707 | if (dev->power.irq_safe) | |
e2e3e4e5 | 708 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 709 | |
c6d22b37 | 710 | mutex_lock(&genpd->lock); |
3f241775 RW |
711 | ret = __pm_genpd_poweron(genpd); |
712 | if (ret) { | |
713 | mutex_unlock(&genpd->lock); | |
714 | return ret; | |
715 | } | |
17b75eca | 716 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
717 | genpd->resume_count++; |
718 | for (;;) { | |
719 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
720 | TASK_UNINTERRUPTIBLE); | |
721 | /* | |
722 | * If current is the powering off task, we have been called | |
723 | * reentrantly from one of the device callbacks, so we should | |
724 | * not wait. | |
725 | */ | |
726 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
727 | break; | |
728 | mutex_unlock(&genpd->lock); | |
729 | ||
730 | schedule(); | |
731 | ||
732 | mutex_lock(&genpd->lock); | |
733 | } | |
734 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 735 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
736 | genpd->resume_count--; |
737 | genpd_set_active(genpd); | |
17b75eca | 738 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 739 | mutex_unlock(&genpd->lock); |
17b75eca | 740 | |
f721889f RW |
741 | return 0; |
742 | } | |
743 | ||
39ac5ba5 TB |
744 | static bool pd_ignore_unused; |
745 | static int __init pd_ignore_unused_setup(char *__unused) | |
746 | { | |
747 | pd_ignore_unused = true; | |
748 | return 1; | |
749 | } | |
750 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
751 | ||
17f2ae7f RW |
752 | /** |
753 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
754 | */ | |
755 | void pm_genpd_poweroff_unused(void) | |
756 | { | |
757 | struct generic_pm_domain *genpd; | |
758 | ||
39ac5ba5 TB |
759 | if (pd_ignore_unused) { |
760 | pr_warn("genpd: Not disabling unused power domains\n"); | |
761 | return; | |
762 | } | |
763 | ||
17f2ae7f RW |
764 | mutex_lock(&gpd_list_lock); |
765 | ||
766 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
767 | genpd_queue_power_off_work(genpd); | |
768 | ||
769 | mutex_unlock(&gpd_list_lock); | |
770 | } | |
771 | ||
2fe71dcd UH |
772 | static int __init genpd_poweroff_unused(void) |
773 | { | |
774 | pm_genpd_poweroff_unused(); | |
775 | return 0; | |
776 | } | |
777 | late_initcall(genpd_poweroff_unused); | |
778 | ||
596ba34b RW |
779 | #ifdef CONFIG_PM_SLEEP |
780 | ||
77f827de RW |
781 | /** |
782 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
783 | * @genpd: PM domain to check. | |
784 | */ | |
895b31f3 | 785 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 786 | { |
895b31f3 | 787 | const struct generic_pm_domain *gpd; |
77f827de RW |
788 | |
789 | if (IS_ERR_OR_NULL(genpd)) | |
790 | return false; | |
791 | ||
792 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
793 | if (gpd == genpd) | |
794 | return true; | |
795 | ||
796 | return false; | |
797 | } | |
798 | ||
d5e4cbfe RW |
799 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
800 | struct device *dev) | |
801 | { | |
802 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
803 | } | |
804 | ||
596ba34b | 805 | /** |
5063ce15 | 806 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
807 | * @genpd: PM domain to power off, if possible. |
808 | * | |
809 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 810 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 811 | * |
77f827de RW |
812 | * This function is only called in "noirq" and "syscore" stages of system power |
813 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
814 | * executed sequentially, so it is guaranteed that it will never run twice in | |
815 | * parallel). | |
596ba34b RW |
816 | */ |
817 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
818 | { | |
5063ce15 | 819 | struct gpd_link *link; |
596ba34b | 820 | |
17b75eca | 821 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
822 | return; |
823 | ||
c4bb3160 RW |
824 | if (genpd->suspended_count != genpd->device_count |
825 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
826 | return; |
827 | ||
c8f0ea45 | 828 | genpd_power_off(genpd); |
596ba34b | 829 | |
17b75eca | 830 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
831 | |
832 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
833 | genpd_sd_counter_dec(link->master); | |
834 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
835 | } |
836 | } | |
837 | ||
802d8b49 RW |
838 | /** |
839 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
840 | * @genpd: PM domain to power on. | |
841 | * | |
77f827de RW |
842 | * This function is only called in "noirq" and "syscore" stages of system power |
843 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
844 | * executed sequentially, so it is guaranteed that it will never run twice in | |
845 | * parallel). | |
802d8b49 RW |
846 | */ |
847 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
848 | { | |
849 | struct gpd_link *link; | |
850 | ||
851 | if (genpd->status != GPD_STATE_POWER_OFF) | |
852 | return; | |
853 | ||
854 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
855 | pm_genpd_sync_poweron(link->master); | |
856 | genpd_sd_counter_inc(link->master); | |
857 | } | |
858 | ||
c8f0ea45 | 859 | genpd_power_on(genpd); |
802d8b49 RW |
860 | |
861 | genpd->status = GPD_STATE_ACTIVE; | |
862 | } | |
863 | ||
4ecd6e65 RW |
864 | /** |
865 | * resume_needed - Check whether to resume a device before system suspend. | |
866 | * @dev: Device to check. | |
867 | * @genpd: PM domain the device belongs to. | |
868 | * | |
869 | * There are two cases in which a device that can wake up the system from sleep | |
870 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
871 | * to wake up the system and it has to remain active for this purpose while the | |
872 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
873 | * the system from sleep states and it generally doesn't generate wakeup signals | |
874 | * by itself (those signals are generated on its behalf by other parts of the | |
875 | * system). In the latter case it may be necessary to reconfigure the device's | |
876 | * wakeup settings during system suspend, because it may have been set up to | |
877 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
878 | * Return 'true' in either of the above cases. | |
879 | */ | |
880 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
881 | { | |
882 | bool active_wakeup; | |
883 | ||
884 | if (!device_can_wakeup(dev)) | |
885 | return false; | |
886 | ||
d5e4cbfe | 887 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
888 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
889 | } | |
890 | ||
596ba34b RW |
891 | /** |
892 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
893 | * @dev: Device to start the transition of. | |
894 | * | |
895 | * Start a power transition of a device (during a system-wide power transition) | |
896 | * under the assumption that its pm_domain field points to the domain member of | |
897 | * an object of type struct generic_pm_domain representing a PM domain | |
898 | * consisting of I/O devices. | |
899 | */ | |
900 | static int pm_genpd_prepare(struct device *dev) | |
901 | { | |
902 | struct generic_pm_domain *genpd; | |
b6c10c84 | 903 | int ret; |
596ba34b RW |
904 | |
905 | dev_dbg(dev, "%s()\n", __func__); | |
906 | ||
907 | genpd = dev_to_genpd(dev); | |
908 | if (IS_ERR(genpd)) | |
909 | return -EINVAL; | |
910 | ||
17b75eca RW |
911 | /* |
912 | * If a wakeup request is pending for the device, it should be woken up | |
913 | * at this point and a system wakeup event should be reported if it's | |
914 | * set up to wake up the system from sleep states. | |
915 | */ | |
916 | pm_runtime_get_noresume(dev); | |
917 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
918 | pm_wakeup_event(dev, 0); | |
919 | ||
920 | if (pm_wakeup_pending()) { | |
84167035 | 921 | pm_runtime_put(dev); |
17b75eca RW |
922 | return -EBUSY; |
923 | } | |
924 | ||
4ecd6e65 RW |
925 | if (resume_needed(dev, genpd)) |
926 | pm_runtime_resume(dev); | |
927 | ||
17b75eca | 928 | genpd_acquire_lock(genpd); |
596ba34b | 929 | |
65533bbf RW |
930 | if (genpd->prepared_count++ == 0) { |
931 | genpd->suspended_count = 0; | |
17b75eca | 932 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 933 | } |
17b75eca RW |
934 | |
935 | genpd_release_lock(genpd); | |
596ba34b RW |
936 | |
937 | if (genpd->suspend_power_off) { | |
17b75eca | 938 | pm_runtime_put_noidle(dev); |
596ba34b RW |
939 | return 0; |
940 | } | |
941 | ||
942 | /* | |
17b75eca RW |
943 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
944 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 945 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 946 | * to make it operational. |
596ba34b | 947 | */ |
17b75eca | 948 | pm_runtime_resume(dev); |
596ba34b RW |
949 | __pm_runtime_disable(dev, false); |
950 | ||
b6c10c84 RW |
951 | ret = pm_generic_prepare(dev); |
952 | if (ret) { | |
953 | mutex_lock(&genpd->lock); | |
954 | ||
955 | if (--genpd->prepared_count == 0) | |
956 | genpd->suspend_power_off = false; | |
957 | ||
958 | mutex_unlock(&genpd->lock); | |
17b75eca | 959 | pm_runtime_enable(dev); |
b6c10c84 | 960 | } |
17b75eca | 961 | |
84167035 | 962 | pm_runtime_put(dev); |
b6c10c84 | 963 | return ret; |
596ba34b RW |
964 | } |
965 | ||
966 | /** | |
967 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
968 | * @dev: Device to suspend. | |
969 | * | |
970 | * Suspend a device under the assumption that its pm_domain field points to the | |
971 | * domain member of an object of type struct generic_pm_domain representing | |
972 | * a PM domain consisting of I/O devices. | |
973 | */ | |
974 | static int pm_genpd_suspend(struct device *dev) | |
975 | { | |
976 | struct generic_pm_domain *genpd; | |
977 | ||
978 | dev_dbg(dev, "%s()\n", __func__); | |
979 | ||
980 | genpd = dev_to_genpd(dev); | |
981 | if (IS_ERR(genpd)) | |
982 | return -EINVAL; | |
983 | ||
1e0407ca | 984 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
985 | } |
986 | ||
987 | /** | |
0496c8ae | 988 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
989 | * @dev: Device to suspend. |
990 | * | |
991 | * Carry out a late suspend of a device under the assumption that its | |
992 | * pm_domain field points to the domain member of an object of type | |
993 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
994 | */ | |
0496c8ae | 995 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
996 | { |
997 | struct generic_pm_domain *genpd; | |
596ba34b RW |
998 | |
999 | dev_dbg(dev, "%s()\n", __func__); | |
1000 | ||
1001 | genpd = dev_to_genpd(dev); | |
1002 | if (IS_ERR(genpd)) | |
1003 | return -EINVAL; | |
1004 | ||
1e0407ca | 1005 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 1006 | } |
596ba34b | 1007 | |
0496c8ae RW |
1008 | /** |
1009 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
1010 | * @dev: Device to suspend. | |
1011 | * | |
1012 | * Stop the device and remove power from the domain if all devices in it have | |
1013 | * been stopped. | |
1014 | */ | |
1015 | static int pm_genpd_suspend_noirq(struct device *dev) | |
1016 | { | |
1017 | struct generic_pm_domain *genpd; | |
1018 | ||
1019 | dev_dbg(dev, "%s()\n", __func__); | |
1020 | ||
1021 | genpd = dev_to_genpd(dev); | |
1022 | if (IS_ERR(genpd)) | |
1023 | return -EINVAL; | |
596ba34b | 1024 | |
dbf37414 | 1025 | if (genpd->suspend_power_off |
0496c8ae | 1026 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1027 | return 0; |
1028 | ||
d5e4cbfe | 1029 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1030 | |
1031 | /* | |
1032 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1033 | * guaranteed that this function will never run twice in parallel for | |
1034 | * the same PM domain, so it is not necessary to use locking here. | |
1035 | */ | |
1036 | genpd->suspended_count++; | |
1037 | pm_genpd_sync_poweroff(genpd); | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | /** | |
0496c8ae | 1043 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1044 | * @dev: Device to resume. |
1045 | * | |
0496c8ae | 1046 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1047 | */ |
1048 | static int pm_genpd_resume_noirq(struct device *dev) | |
1049 | { | |
1050 | struct generic_pm_domain *genpd; | |
1051 | ||
1052 | dev_dbg(dev, "%s()\n", __func__); | |
1053 | ||
1054 | genpd = dev_to_genpd(dev); | |
1055 | if (IS_ERR(genpd)) | |
1056 | return -EINVAL; | |
1057 | ||
dbf37414 | 1058 | if (genpd->suspend_power_off |
cc85b207 | 1059 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1060 | return 0; |
1061 | ||
1062 | /* | |
1063 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1064 | * guaranteed that this function will never run twice in parallel for | |
1065 | * the same PM domain, so it is not necessary to use locking here. | |
1066 | */ | |
802d8b49 | 1067 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1068 | genpd->suspended_count--; |
596ba34b | 1069 | |
0496c8ae | 1070 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1071 | } |
1072 | ||
1073 | /** | |
0496c8ae RW |
1074 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1075 | * @dev: Device to resume. | |
1076 | * | |
1077 | * Carry out an early resume of a device under the assumption that its | |
1078 | * pm_domain field points to the domain member of an object of type | |
1079 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1080 | * devices. | |
1081 | */ | |
1082 | static int pm_genpd_resume_early(struct device *dev) | |
1083 | { | |
1084 | struct generic_pm_domain *genpd; | |
1085 | ||
1086 | dev_dbg(dev, "%s()\n", __func__); | |
1087 | ||
1088 | genpd = dev_to_genpd(dev); | |
1089 | if (IS_ERR(genpd)) | |
1090 | return -EINVAL; | |
1091 | ||
1e0407ca | 1092 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1093 | } |
1094 | ||
1095 | /** | |
1096 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1097 | * @dev: Device to resume. |
1098 | * | |
1099 | * Resume a device under the assumption that its pm_domain field points to the | |
1100 | * domain member of an object of type struct generic_pm_domain representing | |
1101 | * a power domain consisting of I/O devices. | |
1102 | */ | |
1103 | static int pm_genpd_resume(struct device *dev) | |
1104 | { | |
1105 | struct generic_pm_domain *genpd; | |
1106 | ||
1107 | dev_dbg(dev, "%s()\n", __func__); | |
1108 | ||
1109 | genpd = dev_to_genpd(dev); | |
1110 | if (IS_ERR(genpd)) | |
1111 | return -EINVAL; | |
1112 | ||
1e0407ca | 1113 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1114 | } |
1115 | ||
1116 | /** | |
0496c8ae | 1117 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1118 | * @dev: Device to freeze. |
1119 | * | |
1120 | * Freeze a device under the assumption that its pm_domain field points to the | |
1121 | * domain member of an object of type struct generic_pm_domain representing | |
1122 | * a power domain consisting of I/O devices. | |
1123 | */ | |
1124 | static int pm_genpd_freeze(struct device *dev) | |
1125 | { | |
1126 | struct generic_pm_domain *genpd; | |
1127 | ||
1128 | dev_dbg(dev, "%s()\n", __func__); | |
1129 | ||
1130 | genpd = dev_to_genpd(dev); | |
1131 | if (IS_ERR(genpd)) | |
1132 | return -EINVAL; | |
1133 | ||
1e0407ca | 1134 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1135 | } |
1136 | ||
1137 | /** | |
0496c8ae RW |
1138 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1139 | * @dev: Device to freeze. | |
1140 | * | |
1141 | * Carry out a late freeze of a device under the assumption that its | |
1142 | * pm_domain field points to the domain member of an object of type | |
1143 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1144 | * devices. | |
1145 | */ | |
1146 | static int pm_genpd_freeze_late(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_late(dev); |
0496c8ae RW |
1157 | } |
1158 | ||
1159 | /** | |
1160 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
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_noirq(struct device *dev) | |
1169 | { | |
1170 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1171 | |
1172 | dev_dbg(dev, "%s()\n", __func__); | |
1173 | ||
1174 | genpd = dev_to_genpd(dev); | |
1175 | if (IS_ERR(genpd)) | |
1176 | return -EINVAL; | |
1177 | ||
dbf37414 | 1178 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1179 | } |
596ba34b | 1180 | |
0496c8ae RW |
1181 | /** |
1182 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1183 | * @dev: Device to thaw. | |
1184 | * | |
1185 | * Start the device, unless power has been removed from the domain already | |
1186 | * before the system transition. | |
1187 | */ | |
1188 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1189 | { | |
1190 | struct generic_pm_domain *genpd; | |
596ba34b | 1191 | |
0496c8ae | 1192 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1193 | |
0496c8ae RW |
1194 | genpd = dev_to_genpd(dev); |
1195 | if (IS_ERR(genpd)) | |
1196 | return -EINVAL; | |
1197 | ||
dbf37414 | 1198 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1199 | } |
1200 | ||
1201 | /** | |
0496c8ae | 1202 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1203 | * @dev: Device to thaw. |
1204 | * | |
1205 | * Carry out an early thaw of a device under the assumption that its | |
1206 | * pm_domain field points to the domain member of an object of type | |
1207 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1208 | * devices. | |
1209 | */ | |
0496c8ae | 1210 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1211 | { |
1212 | struct generic_pm_domain *genpd; | |
1213 | ||
1214 | dev_dbg(dev, "%s()\n", __func__); | |
1215 | ||
1216 | genpd = dev_to_genpd(dev); | |
1217 | if (IS_ERR(genpd)) | |
1218 | return -EINVAL; | |
1219 | ||
1e0407ca | 1220 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1221 | } |
1222 | ||
1223 | /** | |
1224 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1225 | * @dev: Device to thaw. | |
1226 | * | |
1227 | * Thaw a device under the assumption that its pm_domain field points to the | |
1228 | * domain member of an object of type struct generic_pm_domain representing | |
1229 | * a power domain consisting of I/O devices. | |
1230 | */ | |
1231 | static int pm_genpd_thaw(struct device *dev) | |
1232 | { | |
1233 | struct generic_pm_domain *genpd; | |
1234 | ||
1235 | dev_dbg(dev, "%s()\n", __func__); | |
1236 | ||
1237 | genpd = dev_to_genpd(dev); | |
1238 | if (IS_ERR(genpd)) | |
1239 | return -EINVAL; | |
1240 | ||
1e0407ca | 1241 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1242 | } |
1243 | ||
1244 | /** | |
0496c8ae | 1245 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1246 | * @dev: Device to resume. |
1247 | * | |
0496c8ae RW |
1248 | * Make sure the domain will be in the same power state as before the |
1249 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1250 | */ |
1251 | static int pm_genpd_restore_noirq(struct device *dev) | |
1252 | { | |
1253 | struct generic_pm_domain *genpd; | |
1254 | ||
1255 | dev_dbg(dev, "%s()\n", __func__); | |
1256 | ||
1257 | genpd = dev_to_genpd(dev); | |
1258 | if (IS_ERR(genpd)) | |
1259 | return -EINVAL; | |
1260 | ||
1261 | /* | |
1262 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1263 | * guaranteed that this function will never run twice in parallel for | |
1264 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1265 | * |
1266 | * At this point suspended_count == 0 means we are being run for the | |
1267 | * first time for the given domain in the present cycle. | |
596ba34b | 1268 | */ |
65533bbf | 1269 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1270 | /* |
65533bbf | 1271 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1272 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1273 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1274 | */ |
65533bbf RW |
1275 | genpd->status = GPD_STATE_POWER_OFF; |
1276 | if (genpd->suspend_power_off) { | |
1277 | /* | |
1278 | * If the domain was off before the hibernation, make | |
1279 | * sure it will be off going forward. | |
1280 | */ | |
c8f0ea45 | 1281 | genpd_power_off(genpd); |
65533bbf RW |
1282 | |
1283 | return 0; | |
1284 | } | |
596ba34b RW |
1285 | } |
1286 | ||
18dd2ece RW |
1287 | if (genpd->suspend_power_off) |
1288 | return 0; | |
1289 | ||
802d8b49 | 1290 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1291 | |
dbf37414 | 1292 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1293 | } |
1294 | ||
1295 | /** | |
1296 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1297 | * @dev: Device to complete the transition of. | |
1298 | * | |
1299 | * Complete a power transition of a device (during a system-wide power | |
1300 | * transition) under the assumption that its pm_domain field points to the | |
1301 | * domain member of an object of type struct generic_pm_domain representing | |
1302 | * a power domain consisting of I/O devices. | |
1303 | */ | |
1304 | static void pm_genpd_complete(struct device *dev) | |
1305 | { | |
1306 | struct generic_pm_domain *genpd; | |
1307 | bool run_complete; | |
1308 | ||
1309 | dev_dbg(dev, "%s()\n", __func__); | |
1310 | ||
1311 | genpd = dev_to_genpd(dev); | |
1312 | if (IS_ERR(genpd)) | |
1313 | return; | |
1314 | ||
1315 | mutex_lock(&genpd->lock); | |
1316 | ||
1317 | run_complete = !genpd->suspend_power_off; | |
1318 | if (--genpd->prepared_count == 0) | |
1319 | genpd->suspend_power_off = false; | |
1320 | ||
1321 | mutex_unlock(&genpd->lock); | |
1322 | ||
1323 | if (run_complete) { | |
1324 | pm_generic_complete(dev); | |
6f00ff78 | 1325 | pm_runtime_set_active(dev); |
596ba34b | 1326 | pm_runtime_enable(dev); |
af939339 | 1327 | pm_request_idle(dev); |
596ba34b RW |
1328 | } |
1329 | } | |
1330 | ||
77f827de | 1331 | /** |
d47e6464 | 1332 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1333 | * @dev: Device that normally is marked as "always on" to switch power for. |
1334 | * | |
1335 | * This routine may only be called during the system core (syscore) suspend or | |
1336 | * resume phase for devices whose "always on" flags are set. | |
1337 | */ | |
d47e6464 | 1338 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1339 | { |
1340 | struct generic_pm_domain *genpd; | |
1341 | ||
1342 | genpd = dev_to_genpd(dev); | |
1343 | if (!pm_genpd_present(genpd)) | |
1344 | return; | |
1345 | ||
1346 | if (suspend) { | |
1347 | genpd->suspended_count++; | |
1348 | pm_genpd_sync_poweroff(genpd); | |
1349 | } else { | |
1350 | pm_genpd_sync_poweron(genpd); | |
1351 | genpd->suspended_count--; | |
1352 | } | |
1353 | } | |
d47e6464 UH |
1354 | |
1355 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1356 | { | |
1357 | genpd_syscore_switch(dev, true); | |
1358 | } | |
1359 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1360 | ||
1361 | void pm_genpd_syscore_poweron(struct device *dev) | |
1362 | { | |
1363 | genpd_syscore_switch(dev, false); | |
1364 | } | |
1365 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1366 | |
d30d819d | 1367 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1368 | |
1369 | #define pm_genpd_prepare NULL | |
1370 | #define pm_genpd_suspend NULL | |
0496c8ae | 1371 | #define pm_genpd_suspend_late NULL |
596ba34b | 1372 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1373 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1374 | #define pm_genpd_resume_noirq NULL |
1375 | #define pm_genpd_resume NULL | |
1376 | #define pm_genpd_freeze NULL | |
0496c8ae | 1377 | #define pm_genpd_freeze_late NULL |
596ba34b | 1378 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1379 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1380 | #define pm_genpd_thaw_noirq NULL |
1381 | #define pm_genpd_thaw NULL | |
596ba34b | 1382 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1383 | #define pm_genpd_complete NULL |
1384 | ||
1385 | #endif /* CONFIG_PM_SLEEP */ | |
1386 | ||
1d5fcfec RW |
1387 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1388 | { | |
1389 | struct generic_pm_domain_data *gpd_data; | |
1390 | ||
1391 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1392 | if (!gpd_data) | |
1393 | return NULL; | |
1394 | ||
1395 | mutex_init(&gpd_data->lock); | |
1396 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1397 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1398 | return gpd_data; | |
1399 | } | |
1400 | ||
1401 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1402 | struct generic_pm_domain_data *gpd_data) | |
1403 | { | |
1404 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1405 | kfree(gpd_data); | |
1406 | } | |
1407 | ||
f721889f | 1408 | /** |
b02c999a | 1409 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1410 | * @genpd: PM domain to add the device to. |
1411 | * @dev: Device to be added. | |
b02c999a | 1412 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1413 | */ |
b02c999a RW |
1414 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1415 | struct gpd_timing_data *td) | |
f721889f | 1416 | { |
1d5fcfec | 1417 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1418 | struct pm_domain_data *pdd; |
f721889f RW |
1419 | int ret = 0; |
1420 | ||
1421 | dev_dbg(dev, "%s()\n", __func__); | |
1422 | ||
1423 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1424 | return -EINVAL; | |
1425 | ||
1d5fcfec RW |
1426 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1427 | if (!gpd_data_new) | |
6ff7bb0d RW |
1428 | return -ENOMEM; |
1429 | ||
17b75eca | 1430 | genpd_acquire_lock(genpd); |
f721889f | 1431 | |
596ba34b RW |
1432 | if (genpd->prepared_count > 0) { |
1433 | ret = -EAGAIN; | |
1434 | goto out; | |
1435 | } | |
1436 | ||
4605ab65 RW |
1437 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1438 | if (pdd->dev == dev) { | |
f721889f RW |
1439 | ret = -EINVAL; |
1440 | goto out; | |
1441 | } | |
1442 | ||
1d5fcfec RW |
1443 | ret = dev_pm_get_subsys_data(dev); |
1444 | if (ret) | |
1445 | goto out; | |
1446 | ||
596ba34b | 1447 | genpd->device_count++; |
6ff7bb0d | 1448 | genpd->max_off_time_changed = true; |
f721889f | 1449 | |
6ff7bb0d | 1450 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1451 | |
6ff7bb0d | 1452 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1453 | if (dev->power.subsys_data->domain_data) { |
1454 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1455 | } else { | |
1456 | gpd_data = gpd_data_new; | |
1457 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1458 | } | |
1459 | gpd_data->refcount++; | |
b02c999a RW |
1460 | if (td) |
1461 | gpd_data->td = *td; | |
f721889f | 1462 | |
1d5fcfec RW |
1463 | spin_unlock_irq(&dev->power.lock); |
1464 | ||
d79b6fe1 | 1465 | if (genpd->attach_dev) |
c16561e8 | 1466 | genpd->attach_dev(genpd, dev); |
d79b6fe1 | 1467 | |
1d5fcfec RW |
1468 | mutex_lock(&gpd_data->lock); |
1469 | gpd_data->base.dev = dev; | |
1470 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
67732cd3 | 1471 | gpd_data->need_restore = -1; |
6ff7bb0d RW |
1472 | gpd_data->td.constraint_changed = true; |
1473 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1474 | mutex_unlock(&gpd_data->lock); |
1475 | ||
f721889f | 1476 | out: |
17b75eca | 1477 | genpd_release_lock(genpd); |
f721889f | 1478 | |
1d5fcfec RW |
1479 | if (gpd_data != gpd_data_new) |
1480 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1481 | ||
f721889f RW |
1482 | return ret; |
1483 | } | |
1484 | ||
b5abb085 RW |
1485 | /** |
1486 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1487 | * @domain_name: Name of the PM domain to add the device to. | |
1488 | * @dev: Device to be added. | |
1489 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1490 | */ | |
1491 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1492 | struct gpd_timing_data *td) | |
1493 | { | |
8bc0251d | 1494 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1495 | } |
1496 | ||
f721889f RW |
1497 | /** |
1498 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1499 | * @genpd: PM domain to remove the device from. | |
1500 | * @dev: Device to be removed. | |
1501 | */ | |
1502 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1503 | struct device *dev) | |
1504 | { | |
6ff7bb0d | 1505 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1506 | struct pm_domain_data *pdd; |
1d5fcfec | 1507 | bool remove = false; |
efa69025 | 1508 | int ret = 0; |
f721889f RW |
1509 | |
1510 | dev_dbg(dev, "%s()\n", __func__); | |
1511 | ||
efa69025 RW |
1512 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1513 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1514 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1515 | return -EINVAL; |
1516 | ||
17b75eca | 1517 | genpd_acquire_lock(genpd); |
f721889f | 1518 | |
596ba34b RW |
1519 | if (genpd->prepared_count > 0) { |
1520 | ret = -EAGAIN; | |
1521 | goto out; | |
1522 | } | |
1523 | ||
6ff7bb0d RW |
1524 | genpd->device_count--; |
1525 | genpd->max_off_time_changed = true; | |
1526 | ||
d79b6fe1 | 1527 | if (genpd->detach_dev) |
c16561e8 | 1528 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1529 | |
6ff7bb0d | 1530 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1531 | |
efa69025 RW |
1532 | dev->pm_domain = NULL; |
1533 | pdd = dev->power.subsys_data->domain_data; | |
1534 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1535 | gpd_data = to_gpd_data(pdd); |
1536 | if (--gpd_data->refcount == 0) { | |
1537 | dev->power.subsys_data->domain_data = NULL; | |
1538 | remove = true; | |
1539 | } | |
1540 | ||
6ff7bb0d | 1541 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1542 | |
6ff7bb0d RW |
1543 | mutex_lock(&gpd_data->lock); |
1544 | pdd->dev = NULL; | |
1545 | mutex_unlock(&gpd_data->lock); | |
1546 | ||
1547 | genpd_release_lock(genpd); | |
1548 | ||
6ff7bb0d | 1549 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1550 | if (remove) |
1551 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1552 | ||
6ff7bb0d | 1553 | return 0; |
f721889f | 1554 | |
596ba34b | 1555 | out: |
17b75eca | 1556 | genpd_release_lock(genpd); |
f721889f RW |
1557 | |
1558 | return ret; | |
1559 | } | |
1560 | ||
ca1d72f0 RW |
1561 | /** |
1562 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1563 | * @dev: Device to set/unset the flag for. | |
1564 | * @val: The new value of the device's "need restore" flag. | |
1565 | */ | |
1566 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1567 | { | |
1568 | struct pm_subsys_data *psd; | |
1569 | unsigned long flags; | |
1570 | ||
1571 | spin_lock_irqsave(&dev->power.lock, flags); | |
1572 | ||
1573 | psd = dev_to_psd(dev); | |
1574 | if (psd && psd->domain_data) | |
67732cd3 | 1575 | to_gpd_data(psd->domain_data)->need_restore = val ? 1 : 0; |
ca1d72f0 RW |
1576 | |
1577 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1578 | } | |
1579 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1580 | ||
f721889f RW |
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 | { | |
2123 | struct generic_pm_domain *pd = NULL, *gpd; | |
2124 | int ret = 0; | |
2125 | ||
2126 | if (!dev->pm_domain) | |
2127 | return; | |
2128 | ||
2129 | mutex_lock(&gpd_list_lock); | |
2130 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2131 | if (&gpd->domain == dev->pm_domain) { | |
2132 | pd = gpd; | |
2133 | break; | |
2134 | } | |
2135 | } | |
2136 | mutex_unlock(&gpd_list_lock); | |
2137 | ||
2138 | if (!pd) | |
2139 | return; | |
2140 | ||
2141 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2142 | ||
2143 | while (1) { | |
2144 | ret = pm_genpd_remove_device(pd, dev); | |
2145 | if (ret != -EAGAIN) | |
2146 | break; | |
2147 | cond_resched(); | |
2148 | } | |
2149 | ||
2150 | if (ret < 0) { | |
2151 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2152 | pd->name, ret); | |
2153 | return; | |
2154 | } | |
2155 | ||
2156 | /* Check if PM domain can be powered off after removing this device. */ | |
2157 | genpd_queue_power_off_work(pd); | |
2158 | } | |
2159 | ||
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; | |
2ed12769 | 2226 | pm_genpd_poweron(pd); |
aa42240a TF |
2227 | |
2228 | return 0; | |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 2231 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2232 | |
2233 | ||
2234 | /*** debugfs support ***/ | |
2235 | ||
2236 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2237 | #include <linux/pm.h> | |
2238 | #include <linux/device.h> | |
2239 | #include <linux/debugfs.h> | |
2240 | #include <linux/seq_file.h> | |
2241 | #include <linux/init.h> | |
2242 | #include <linux/kobject.h> | |
2243 | static struct dentry *pm_genpd_debugfs_dir; | |
2244 | ||
2245 | /* | |
2246 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2247 | * from sysfs.c, so generalize it. |
2bd5306a | 2248 | */ |
2bd5306a MM |
2249 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2250 | { | |
2251 | static const char * const status_lookup[] = { | |
2252 | [RPM_ACTIVE] = "active", | |
2253 | [RPM_RESUMING] = "resuming", | |
2254 | [RPM_SUSPENDED] = "suspended", | |
2255 | [RPM_SUSPENDING] = "suspending" | |
2256 | }; | |
2257 | const char *p = ""; | |
2258 | ||
2259 | if (dev->power.runtime_error) | |
2260 | p = "error"; | |
2261 | else if (dev->power.disable_depth) | |
2262 | p = "unsupported"; | |
2263 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2264 | p = status_lookup[dev->power.runtime_status]; | |
2265 | else | |
2266 | WARN_ON(1); | |
2267 | ||
2268 | seq_puts(s, p); | |
2269 | } | |
2bd5306a MM |
2270 | |
2271 | static int pm_genpd_summary_one(struct seq_file *s, | |
2272 | struct generic_pm_domain *gpd) | |
2273 | { | |
2274 | static const char * const status_lookup[] = { | |
2275 | [GPD_STATE_ACTIVE] = "on", | |
2276 | [GPD_STATE_WAIT_MASTER] = "wait-master", | |
2277 | [GPD_STATE_BUSY] = "busy", | |
2278 | [GPD_STATE_REPEAT] = "off-in-progress", | |
2279 | [GPD_STATE_POWER_OFF] = "off" | |
2280 | }; | |
2281 | struct pm_domain_data *pm_data; | |
2282 | const char *kobj_path; | |
2283 | struct gpd_link *link; | |
2284 | int ret; | |
2285 | ||
2286 | ret = mutex_lock_interruptible(&gpd->lock); | |
2287 | if (ret) | |
2288 | return -ERESTARTSYS; | |
2289 | ||
2290 | if (WARN_ON(gpd->status >= ARRAY_SIZE(status_lookup))) | |
2291 | goto exit; | |
2292 | seq_printf(s, "%-30s %-15s ", gpd->name, status_lookup[gpd->status]); | |
2293 | ||
2294 | /* | |
2295 | * Modifications on the list require holding locks on both | |
2296 | * master and slave, so we are safe. | |
2297 | * Also gpd->name is immutable. | |
2298 | */ | |
2299 | list_for_each_entry(link, &gpd->master_links, master_node) { | |
2300 | seq_printf(s, "%s", link->slave->name); | |
2301 | if (!list_is_last(&link->master_node, &gpd->master_links)) | |
2302 | seq_puts(s, ", "); | |
2303 | } | |
2304 | ||
2305 | list_for_each_entry(pm_data, &gpd->dev_list, list_node) { | |
2306 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); | |
2307 | if (kobj_path == NULL) | |
2308 | continue; | |
2309 | ||
2310 | seq_printf(s, "\n %-50s ", kobj_path); | |
2311 | rtpm_status_str(s, pm_data->dev); | |
2312 | kfree(kobj_path); | |
2313 | } | |
2314 | ||
2315 | seq_puts(s, "\n"); | |
2316 | exit: | |
2317 | mutex_unlock(&gpd->lock); | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2323 | { | |
2324 | struct generic_pm_domain *gpd; | |
2325 | int ret = 0; | |
2326 | ||
2327 | seq_puts(s, " domain status slaves\n"); | |
2328 | seq_puts(s, " /device runtime status\n"); | |
2329 | seq_puts(s, "----------------------------------------------------------------------\n"); | |
2330 | ||
2331 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2332 | if (ret) | |
2333 | return -ERESTARTSYS; | |
2334 | ||
2335 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2336 | ret = pm_genpd_summary_one(s, gpd); | |
2337 | if (ret) | |
2338 | break; | |
2339 | } | |
2340 | mutex_unlock(&gpd_list_lock); | |
2341 | ||
2342 | return ret; | |
2343 | } | |
2344 | ||
2345 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2346 | { | |
2347 | return single_open(file, pm_genpd_summary_show, NULL); | |
2348 | } | |
2349 | ||
2350 | static const struct file_operations pm_genpd_summary_fops = { | |
2351 | .open = pm_genpd_summary_open, | |
2352 | .read = seq_read, | |
2353 | .llseek = seq_lseek, | |
2354 | .release = single_release, | |
2355 | }; | |
2356 | ||
2357 | static int __init pm_genpd_debug_init(void) | |
2358 | { | |
2359 | struct dentry *d; | |
2360 | ||
2361 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2362 | ||
2363 | if (!pm_genpd_debugfs_dir) | |
2364 | return -ENOMEM; | |
2365 | ||
2366 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2367 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2368 | if (!d) | |
2369 | return -ENOMEM; | |
2370 | ||
2371 | return 0; | |
2372 | } | |
2373 | late_initcall(pm_genpd_debug_init); | |
2374 | ||
2375 | static void __exit pm_genpd_debug_exit(void) | |
2376 | { | |
2377 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2378 | } | |
2379 | __exitcall(pm_genpd_debug_exit); | |
2380 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |