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