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Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
f721889f RW |
9 | #include <linux/kernel.h> |
10 | #include <linux/io.h> | |
aa42240a | 11 | #include <linux/platform_device.h> |
f721889f RW |
12 | #include <linux/pm_runtime.h> |
13 | #include <linux/pm_domain.h> | |
6ff7bb0d | 14 | #include <linux/pm_qos.h> |
c11f6f5b | 15 | #include <linux/pm_clock.h> |
f721889f RW |
16 | #include <linux/slab.h> |
17 | #include <linux/err.h> | |
17b75eca RW |
18 | #include <linux/sched.h> |
19 | #include <linux/suspend.h> | |
d5e4cbfe RW |
20 | #include <linux/export.h> |
21 | ||
22 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ | |
23 | ({ \ | |
24 | type (*__routine)(struct device *__d); \ | |
25 | type __ret = (type)0; \ | |
26 | \ | |
27 | __routine = genpd->dev_ops.callback; \ | |
28 | if (__routine) { \ | |
29 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
30 | } \ |
31 | __ret; \ | |
32 | }) | |
f721889f | 33 | |
0140d8bd RW |
34 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
35 | ({ \ | |
36 | ktime_t __start = ktime_get(); \ | |
37 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
38 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
39 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
40 | if (!__retval && __elapsed > __td->field) { \ | |
41 | __td->field = __elapsed; \ | |
7d1af287 | 42 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 43 | __elapsed); \ |
6ff7bb0d RW |
44 | genpd->max_off_time_changed = true; \ |
45 | __td->constraint_changed = true; \ | |
0140d8bd RW |
46 | } \ |
47 | __retval; \ | |
48 | }) | |
49 | ||
5125bbf3 RW |
50 | static LIST_HEAD(gpd_list); |
51 | static DEFINE_MUTEX(gpd_list_lock); | |
52 | ||
8bc0251d RW |
53 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
54 | { | |
55 | struct generic_pm_domain *genpd = NULL, *gpd; | |
56 | ||
57 | if (IS_ERR_OR_NULL(domain_name)) | |
58 | return NULL; | |
59 | ||
60 | mutex_lock(&gpd_list_lock); | |
61 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
62 | if (!strcmp(gpd->name, domain_name)) { | |
63 | genpd = gpd; | |
64 | break; | |
65 | } | |
66 | } | |
67 | mutex_unlock(&gpd_list_lock); | |
68 | return genpd; | |
69 | } | |
70 | ||
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 | ||
5248051b RW |
321 | #ifdef CONFIG_PM_RUNTIME |
322 | ||
b3d3b9fb SK |
323 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
324 | struct device *dev) | |
325 | { | |
326 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
327 | } | |
328 | ||
8e9afafd RW |
329 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
330 | { | |
331 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
332 | save_state_latency_ns, "state save"); | |
333 | } | |
334 | ||
335 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) | |
336 | { | |
337 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, | |
338 | restore_state_latency_ns, | |
339 | "state restore"); | |
340 | } | |
341 | ||
6ff7bb0d RW |
342 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
343 | unsigned long val, void *ptr) | |
344 | { | |
345 | struct generic_pm_domain_data *gpd_data; | |
346 | struct device *dev; | |
347 | ||
348 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
349 | ||
350 | mutex_lock(&gpd_data->lock); | |
351 | dev = gpd_data->base.dev; | |
352 | if (!dev) { | |
353 | mutex_unlock(&gpd_data->lock); | |
354 | return NOTIFY_DONE; | |
355 | } | |
356 | mutex_unlock(&gpd_data->lock); | |
357 | ||
358 | for (;;) { | |
359 | struct generic_pm_domain *genpd; | |
360 | struct pm_domain_data *pdd; | |
361 | ||
362 | spin_lock_irq(&dev->power.lock); | |
363 | ||
364 | pdd = dev->power.subsys_data ? | |
365 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 366 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
367 | to_gpd_data(pdd)->td.constraint_changed = true; |
368 | genpd = dev_to_genpd(dev); | |
369 | } else { | |
370 | genpd = ERR_PTR(-ENODATA); | |
371 | } | |
372 | ||
373 | spin_unlock_irq(&dev->power.lock); | |
374 | ||
375 | if (!IS_ERR(genpd)) { | |
376 | mutex_lock(&genpd->lock); | |
377 | genpd->max_off_time_changed = true; | |
378 | mutex_unlock(&genpd->lock); | |
379 | } | |
380 | ||
381 | dev = dev->parent; | |
382 | if (!dev || dev->power.ignore_children) | |
383 | break; | |
384 | } | |
385 | ||
386 | return NOTIFY_DONE; | |
387 | } | |
388 | ||
f721889f RW |
389 | /** |
390 | * __pm_genpd_save_device - Save the pre-suspend state of a device. | |
4605ab65 | 391 | * @pdd: Domain data of the device to save the state of. |
f721889f RW |
392 | * @genpd: PM domain the device belongs to. |
393 | */ | |
4605ab65 | 394 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
f721889f | 395 | struct generic_pm_domain *genpd) |
17b75eca | 396 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 397 | { |
cd0ea672 | 398 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 399 | struct device *dev = pdd->dev; |
f721889f RW |
400 | int ret = 0; |
401 | ||
67732cd3 | 402 | if (gpd_data->need_restore > 0) |
f721889f RW |
403 | return 0; |
404 | ||
67732cd3 UH |
405 | /* |
406 | * If the value of the need_restore flag is still unknown at this point, | |
407 | * we trust that pm_genpd_poweroff() has verified that the device is | |
408 | * already runtime PM suspended. | |
409 | */ | |
410 | if (gpd_data->need_restore < 0) { | |
411 | gpd_data->need_restore = 1; | |
412 | return 0; | |
413 | } | |
414 | ||
17b75eca RW |
415 | mutex_unlock(&genpd->lock); |
416 | ||
ecf00475 RW |
417 | genpd_start_dev(genpd, dev); |
418 | ret = genpd_save_dev(genpd, dev); | |
419 | genpd_stop_dev(genpd, dev); | |
f721889f | 420 | |
17b75eca RW |
421 | mutex_lock(&genpd->lock); |
422 | ||
f721889f | 423 | if (!ret) |
67732cd3 | 424 | gpd_data->need_restore = 1; |
f721889f RW |
425 | |
426 | return ret; | |
427 | } | |
428 | ||
429 | /** | |
430 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. | |
4605ab65 | 431 | * @pdd: Domain data of the device to restore the state of. |
f721889f RW |
432 | * @genpd: PM domain the device belongs to. |
433 | */ | |
4605ab65 | 434 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
f721889f | 435 | struct generic_pm_domain *genpd) |
17b75eca | 436 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 437 | { |
cd0ea672 | 438 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
4605ab65 | 439 | struct device *dev = pdd->dev; |
67732cd3 | 440 | int need_restore = gpd_data->need_restore; |
f721889f | 441 | |
67732cd3 | 442 | gpd_data->need_restore = 0; |
17b75eca RW |
443 | mutex_unlock(&genpd->lock); |
444 | ||
ecf00475 | 445 | genpd_start_dev(genpd, dev); |
67732cd3 UH |
446 | |
447 | /* | |
448 | * Call genpd_restore_dev() for recently added devices too (need_restore | |
449 | * is negative then). | |
450 | */ | |
80de3d7f RW |
451 | if (need_restore) |
452 | genpd_restore_dev(genpd, dev); | |
f721889f | 453 | |
17b75eca | 454 | mutex_lock(&genpd->lock); |
f721889f RW |
455 | } |
456 | ||
c6d22b37 RW |
457 | /** |
458 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. | |
459 | * @genpd: PM domain to check. | |
460 | * | |
461 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during | |
462 | * a "power off" operation, which means that a "power on" has occured in the | |
463 | * meantime, or if its resume_count field is different from zero, which means | |
464 | * that one of its devices has been resumed in the meantime. | |
465 | */ | |
466 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) | |
467 | { | |
17877eb5 | 468 | return genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 469 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
c6d22b37 RW |
470 | } |
471 | ||
56375fd4 RW |
472 | /** |
473 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
474 | * @genpd: PM domait to power off. | |
475 | * | |
476 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
477 | * before. | |
478 | */ | |
d971f0b0 | 479 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 480 | { |
a4ca26a4 | 481 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
482 | } |
483 | ||
f721889f RW |
484 | /** |
485 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
486 | * @genpd: PM domain to power down. | |
487 | * | |
488 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
489 | * have been powered down, run the runtime suspend callbacks provided by all of | |
490 | * the @genpd's devices' drivers and remove power from @genpd. | |
491 | */ | |
492 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
17b75eca | 493 | __releases(&genpd->lock) __acquires(&genpd->lock) |
f721889f | 494 | { |
4605ab65 | 495 | struct pm_domain_data *pdd; |
5063ce15 | 496 | struct gpd_link *link; |
f721889f | 497 | unsigned int not_suspended; |
c6d22b37 | 498 | int ret = 0; |
f721889f | 499 | |
c6d22b37 RW |
500 | start: |
501 | /* | |
502 | * Do not try to power off the domain in the following situations: | |
503 | * (1) The domain is already in the "power off" state. | |
5063ce15 | 504 | * (2) The domain is waiting for its master to power up. |
c6d22b37 | 505 | * (3) One of the domain's devices is being resumed right now. |
3f241775 | 506 | * (4) System suspend is in progress. |
c6d22b37 | 507 | */ |
3f241775 | 508 | if (genpd->status == GPD_STATE_POWER_OFF |
17877eb5 | 509 | || genpd->status == GPD_STATE_WAIT_MASTER |
3f241775 | 510 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
f721889f RW |
511 | return 0; |
512 | ||
c4bb3160 | 513 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
514 | return -EBUSY; |
515 | ||
516 | not_suspended = 0; | |
34b1f762 RW |
517 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
518 | enum pm_qos_flags_status stat; | |
519 | ||
520 | stat = dev_pm_qos_flags(pdd->dev, | |
521 | PM_QOS_FLAG_NO_POWER_OFF | |
522 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
523 | if (stat > PM_QOS_FLAGS_NONE) | |
524 | return -EBUSY; | |
525 | ||
0aa2a221 | 526 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 527 | || pdd->dev->power.irq_safe)) |
f721889f | 528 | not_suspended++; |
34b1f762 | 529 | } |
f721889f RW |
530 | |
531 | if (not_suspended > genpd->in_progress) | |
532 | return -EBUSY; | |
533 | ||
c6d22b37 RW |
534 | if (genpd->poweroff_task) { |
535 | /* | |
536 | * Another instance of pm_genpd_poweroff() is executing | |
537 | * callbacks, so tell it to start over and return. | |
538 | */ | |
539 | genpd->status = GPD_STATE_REPEAT; | |
540 | return 0; | |
541 | } | |
542 | ||
f721889f RW |
543 | if (genpd->gov && genpd->gov->power_down_ok) { |
544 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
545 | return -EAGAIN; | |
546 | } | |
547 | ||
17b75eca | 548 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 | 549 | genpd->poweroff_task = current; |
17b75eca | 550 | |
4605ab65 | 551 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
3c07cbc4 | 552 | ret = atomic_read(&genpd->sd_count) == 0 ? |
4605ab65 | 553 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
3f241775 RW |
554 | |
555 | if (genpd_abort_poweroff(genpd)) | |
556 | goto out; | |
557 | ||
697a7f37 RW |
558 | if (ret) { |
559 | genpd_set_active(genpd); | |
560 | goto out; | |
561 | } | |
f721889f | 562 | |
c6d22b37 RW |
563 | if (genpd->status == GPD_STATE_REPEAT) { |
564 | genpd->poweroff_task = NULL; | |
565 | goto start; | |
566 | } | |
567 | } | |
17b75eca | 568 | |
f39cb179 | 569 | if (genpd->cpuidle_data) { |
cbc9ef02 | 570 | /* |
f39cb179 UH |
571 | * If cpuidle_data is set, cpuidle should turn the domain off |
572 | * when the CPU in it is idle. In that case we don't decrement | |
573 | * the subdomain counts of the master domains, so that power is | |
574 | * not removed from the current domain prematurely as a result | |
575 | * of cutting off the masters' power. | |
cbc9ef02 RW |
576 | */ |
577 | genpd->status = GPD_STATE_POWER_OFF; | |
578 | cpuidle_pause_and_lock(); | |
f39cb179 | 579 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 RW |
580 | cpuidle_resume_and_unlock(); |
581 | goto out; | |
582 | } | |
583 | ||
3c07cbc4 RW |
584 | if (genpd->power_off) { |
585 | if (atomic_read(&genpd->sd_count) > 0) { | |
586 | ret = -EBUSY; | |
c6d22b37 RW |
587 | goto out; |
588 | } | |
17b75eca | 589 | |
3c07cbc4 | 590 | /* |
5063ce15 RW |
591 | * If sd_count > 0 at this point, one of the subdomains hasn't |
592 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
593 | * incrementing it. In that case pm_genpd_poweron() will wait |
594 | * for us to drop the lock, so we can call .power_off() and let | |
595 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
596 | * happen very often). | |
597 | */ | |
c8f0ea45 | 598 | ret = genpd_power_off(genpd); |
d2805402 RW |
599 | if (ret == -EBUSY) { |
600 | genpd_set_active(genpd); | |
d2805402 RW |
601 | goto out; |
602 | } | |
603 | } | |
f721889f | 604 | |
17b75eca | 605 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 606 | |
5063ce15 RW |
607 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
608 | genpd_sd_counter_dec(link->master); | |
609 | genpd_queue_power_off_work(link->master); | |
610 | } | |
f721889f | 611 | |
c6d22b37 RW |
612 | out: |
613 | genpd->poweroff_task = NULL; | |
614 | wake_up_all(&genpd->status_wait_queue); | |
615 | return ret; | |
f721889f RW |
616 | } |
617 | ||
618 | /** | |
619 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
620 | * @work: Work structure used for scheduling the execution of this function. | |
621 | */ | |
622 | static void genpd_power_off_work_fn(struct work_struct *work) | |
623 | { | |
624 | struct generic_pm_domain *genpd; | |
625 | ||
626 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
627 | ||
17b75eca | 628 | genpd_acquire_lock(genpd); |
f721889f | 629 | pm_genpd_poweroff(genpd); |
17b75eca | 630 | genpd_release_lock(genpd); |
f721889f RW |
631 | } |
632 | ||
633 | /** | |
634 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
635 | * @dev: Device to suspend. | |
636 | * | |
637 | * Carry out a runtime suspend of a device under the assumption that its | |
638 | * pm_domain field points to the domain member of an object of type | |
639 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
640 | */ | |
641 | static int pm_genpd_runtime_suspend(struct device *dev) | |
642 | { | |
643 | struct generic_pm_domain *genpd; | |
67732cd3 | 644 | struct generic_pm_domain_data *gpd_data; |
b02c999a | 645 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 646 | int ret; |
f721889f RW |
647 | |
648 | dev_dbg(dev, "%s()\n", __func__); | |
649 | ||
5248051b RW |
650 | genpd = dev_to_genpd(dev); |
651 | if (IS_ERR(genpd)) | |
f721889f RW |
652 | return -EINVAL; |
653 | ||
b02c999a RW |
654 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
655 | if (stop_ok && !stop_ok(dev)) | |
656 | return -EBUSY; | |
657 | ||
d5e4cbfe RW |
658 | ret = genpd_stop_dev(genpd, dev); |
659 | if (ret) | |
660 | return ret; | |
17b75eca | 661 | |
0aa2a221 RW |
662 | /* |
663 | * If power.irq_safe is set, this routine will be run with interrupts | |
664 | * off, so it can't use mutexes. | |
665 | */ | |
666 | if (dev->power.irq_safe) | |
667 | return 0; | |
668 | ||
c6d22b37 | 669 | mutex_lock(&genpd->lock); |
67732cd3 UH |
670 | |
671 | /* | |
672 | * If we have an unknown state of the need_restore flag, it means none | |
673 | * of the runtime PM callbacks has been invoked yet. Let's update the | |
674 | * flag to reflect that the current state is active. | |
675 | */ | |
676 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
677 | if (gpd_data->need_restore < 0) | |
678 | gpd_data->need_restore = 0; | |
679 | ||
f721889f RW |
680 | genpd->in_progress++; |
681 | pm_genpd_poweroff(genpd); | |
682 | genpd->in_progress--; | |
c6d22b37 | 683 | mutex_unlock(&genpd->lock); |
f721889f RW |
684 | |
685 | return 0; | |
686 | } | |
687 | ||
f721889f RW |
688 | /** |
689 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
690 | * @dev: Device to resume. | |
691 | * | |
692 | * Carry out a runtime resume of a device under the assumption that its | |
693 | * pm_domain field points to the domain member of an object of type | |
694 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
695 | */ | |
696 | static int pm_genpd_runtime_resume(struct device *dev) | |
697 | { | |
698 | struct generic_pm_domain *genpd; | |
c6d22b37 | 699 | DEFINE_WAIT(wait); |
f721889f RW |
700 | int ret; |
701 | ||
702 | dev_dbg(dev, "%s()\n", __func__); | |
703 | ||
5248051b RW |
704 | genpd = dev_to_genpd(dev); |
705 | if (IS_ERR(genpd)) | |
f721889f RW |
706 | return -EINVAL; |
707 | ||
0aa2a221 RW |
708 | /* If power.irq_safe, the PM domain is never powered off. */ |
709 | if (dev->power.irq_safe) | |
e2e3e4e5 | 710 | return genpd_start_dev_no_timing(genpd, dev); |
0aa2a221 | 711 | |
c6d22b37 | 712 | mutex_lock(&genpd->lock); |
3f241775 RW |
713 | ret = __pm_genpd_poweron(genpd); |
714 | if (ret) { | |
715 | mutex_unlock(&genpd->lock); | |
716 | return ret; | |
717 | } | |
17b75eca | 718 | genpd->status = GPD_STATE_BUSY; |
c6d22b37 RW |
719 | genpd->resume_count++; |
720 | for (;;) { | |
721 | prepare_to_wait(&genpd->status_wait_queue, &wait, | |
722 | TASK_UNINTERRUPTIBLE); | |
723 | /* | |
724 | * If current is the powering off task, we have been called | |
725 | * reentrantly from one of the device callbacks, so we should | |
726 | * not wait. | |
727 | */ | |
728 | if (!genpd->poweroff_task || genpd->poweroff_task == current) | |
729 | break; | |
730 | mutex_unlock(&genpd->lock); | |
731 | ||
732 | schedule(); | |
733 | ||
734 | mutex_lock(&genpd->lock); | |
735 | } | |
736 | finish_wait(&genpd->status_wait_queue, &wait); | |
cd0ea672 | 737 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
c6d22b37 RW |
738 | genpd->resume_count--; |
739 | genpd_set_active(genpd); | |
17b75eca | 740 | wake_up_all(&genpd->status_wait_queue); |
c6d22b37 | 741 | mutex_unlock(&genpd->lock); |
17b75eca | 742 | |
f721889f RW |
743 | return 0; |
744 | } | |
745 | ||
39ac5ba5 TB |
746 | static bool pd_ignore_unused; |
747 | static int __init pd_ignore_unused_setup(char *__unused) | |
748 | { | |
749 | pd_ignore_unused = true; | |
750 | return 1; | |
751 | } | |
752 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
753 | ||
17f2ae7f RW |
754 | /** |
755 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
756 | */ | |
757 | void pm_genpd_poweroff_unused(void) | |
758 | { | |
759 | struct generic_pm_domain *genpd; | |
760 | ||
39ac5ba5 TB |
761 | if (pd_ignore_unused) { |
762 | pr_warn("genpd: Not disabling unused power domains\n"); | |
763 | return; | |
764 | } | |
765 | ||
17f2ae7f RW |
766 | mutex_lock(&gpd_list_lock); |
767 | ||
768 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
769 | genpd_queue_power_off_work(genpd); | |
770 | ||
771 | mutex_unlock(&gpd_list_lock); | |
772 | } | |
773 | ||
2fe71dcd UH |
774 | static int __init genpd_poweroff_unused(void) |
775 | { | |
776 | pm_genpd_poweroff_unused(); | |
777 | return 0; | |
778 | } | |
779 | late_initcall(genpd_poweroff_unused); | |
780 | ||
f721889f RW |
781 | #else |
782 | ||
6ff7bb0d RW |
783 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
784 | unsigned long val, void *ptr) | |
785 | { | |
786 | return NOTIFY_DONE; | |
787 | } | |
788 | ||
d971f0b0 UH |
789 | static inline void |
790 | genpd_queue_power_off_work(struct generic_pm_domain *genpd) {} | |
791 | ||
f721889f RW |
792 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
793 | ||
794 | #define pm_genpd_runtime_suspend NULL | |
795 | #define pm_genpd_runtime_resume NULL | |
796 | ||
797 | #endif /* CONFIG_PM_RUNTIME */ | |
798 | ||
596ba34b RW |
799 | #ifdef CONFIG_PM_SLEEP |
800 | ||
77f827de RW |
801 | /** |
802 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
803 | * @genpd: PM domain to check. | |
804 | */ | |
895b31f3 | 805 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 806 | { |
895b31f3 | 807 | const struct generic_pm_domain *gpd; |
77f827de RW |
808 | |
809 | if (IS_ERR_OR_NULL(genpd)) | |
810 | return false; | |
811 | ||
812 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
813 | if (gpd == genpd) | |
814 | return true; | |
815 | ||
816 | return false; | |
817 | } | |
818 | ||
d5e4cbfe RW |
819 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
820 | struct device *dev) | |
821 | { | |
822 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
823 | } | |
824 | ||
596ba34b | 825 | /** |
5063ce15 | 826 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b RW |
827 | * @genpd: PM domain to power off, if possible. |
828 | * | |
829 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 830 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 831 | * |
77f827de RW |
832 | * This function is only called in "noirq" and "syscore" stages of system power |
833 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
834 | * executed sequentially, so it is guaranteed that it will never run twice in | |
835 | * parallel). | |
596ba34b RW |
836 | */ |
837 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) | |
838 | { | |
5063ce15 | 839 | struct gpd_link *link; |
596ba34b | 840 | |
17b75eca | 841 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
842 | return; |
843 | ||
c4bb3160 RW |
844 | if (genpd->suspended_count != genpd->device_count |
845 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
846 | return; |
847 | ||
c8f0ea45 | 848 | genpd_power_off(genpd); |
596ba34b | 849 | |
17b75eca | 850 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
851 | |
852 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
853 | genpd_sd_counter_dec(link->master); | |
854 | pm_genpd_sync_poweroff(link->master); | |
596ba34b RW |
855 | } |
856 | } | |
857 | ||
802d8b49 RW |
858 | /** |
859 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
860 | * @genpd: PM domain to power on. | |
861 | * | |
77f827de RW |
862 | * This function is only called in "noirq" and "syscore" stages of system power |
863 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
864 | * executed sequentially, so it is guaranteed that it will never run twice in | |
865 | * parallel). | |
802d8b49 RW |
866 | */ |
867 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) | |
868 | { | |
869 | struct gpd_link *link; | |
870 | ||
871 | if (genpd->status != GPD_STATE_POWER_OFF) | |
872 | return; | |
873 | ||
874 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
875 | pm_genpd_sync_poweron(link->master); | |
876 | genpd_sd_counter_inc(link->master); | |
877 | } | |
878 | ||
c8f0ea45 | 879 | genpd_power_on(genpd); |
802d8b49 RW |
880 | |
881 | genpd->status = GPD_STATE_ACTIVE; | |
882 | } | |
883 | ||
4ecd6e65 RW |
884 | /** |
885 | * resume_needed - Check whether to resume a device before system suspend. | |
886 | * @dev: Device to check. | |
887 | * @genpd: PM domain the device belongs to. | |
888 | * | |
889 | * There are two cases in which a device that can wake up the system from sleep | |
890 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
891 | * to wake up the system and it has to remain active for this purpose while the | |
892 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
893 | * the system from sleep states and it generally doesn't generate wakeup signals | |
894 | * by itself (those signals are generated on its behalf by other parts of the | |
895 | * system). In the latter case it may be necessary to reconfigure the device's | |
896 | * wakeup settings during system suspend, because it may have been set up to | |
897 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
898 | * Return 'true' in either of the above cases. | |
899 | */ | |
900 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
901 | { | |
902 | bool active_wakeup; | |
903 | ||
904 | if (!device_can_wakeup(dev)) | |
905 | return false; | |
906 | ||
d5e4cbfe | 907 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
908 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
909 | } | |
910 | ||
596ba34b RW |
911 | /** |
912 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
913 | * @dev: Device to start the transition of. | |
914 | * | |
915 | * Start a power transition of a device (during a system-wide power transition) | |
916 | * under the assumption that its pm_domain field points to the domain member of | |
917 | * an object of type struct generic_pm_domain representing a PM domain | |
918 | * consisting of I/O devices. | |
919 | */ | |
920 | static int pm_genpd_prepare(struct device *dev) | |
921 | { | |
922 | struct generic_pm_domain *genpd; | |
b6c10c84 | 923 | int ret; |
596ba34b RW |
924 | |
925 | dev_dbg(dev, "%s()\n", __func__); | |
926 | ||
927 | genpd = dev_to_genpd(dev); | |
928 | if (IS_ERR(genpd)) | |
929 | return -EINVAL; | |
930 | ||
17b75eca RW |
931 | /* |
932 | * If a wakeup request is pending for the device, it should be woken up | |
933 | * at this point and a system wakeup event should be reported if it's | |
934 | * set up to wake up the system from sleep states. | |
935 | */ | |
936 | pm_runtime_get_noresume(dev); | |
937 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
938 | pm_wakeup_event(dev, 0); | |
939 | ||
940 | if (pm_wakeup_pending()) { | |
84167035 | 941 | pm_runtime_put(dev); |
17b75eca RW |
942 | return -EBUSY; |
943 | } | |
944 | ||
4ecd6e65 RW |
945 | if (resume_needed(dev, genpd)) |
946 | pm_runtime_resume(dev); | |
947 | ||
17b75eca | 948 | genpd_acquire_lock(genpd); |
596ba34b | 949 | |
65533bbf RW |
950 | if (genpd->prepared_count++ == 0) { |
951 | genpd->suspended_count = 0; | |
17b75eca | 952 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 953 | } |
17b75eca RW |
954 | |
955 | genpd_release_lock(genpd); | |
596ba34b RW |
956 | |
957 | if (genpd->suspend_power_off) { | |
17b75eca | 958 | pm_runtime_put_noidle(dev); |
596ba34b RW |
959 | return 0; |
960 | } | |
961 | ||
962 | /* | |
17b75eca RW |
963 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
964 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 965 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 966 | * to make it operational. |
596ba34b | 967 | */ |
17b75eca | 968 | pm_runtime_resume(dev); |
596ba34b RW |
969 | __pm_runtime_disable(dev, false); |
970 | ||
b6c10c84 RW |
971 | ret = pm_generic_prepare(dev); |
972 | if (ret) { | |
973 | mutex_lock(&genpd->lock); | |
974 | ||
975 | if (--genpd->prepared_count == 0) | |
976 | genpd->suspend_power_off = false; | |
977 | ||
978 | mutex_unlock(&genpd->lock); | |
17b75eca | 979 | pm_runtime_enable(dev); |
b6c10c84 | 980 | } |
17b75eca | 981 | |
84167035 | 982 | pm_runtime_put(dev); |
b6c10c84 | 983 | return ret; |
596ba34b RW |
984 | } |
985 | ||
986 | /** | |
987 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
988 | * @dev: Device to suspend. | |
989 | * | |
990 | * Suspend a device under the assumption that its pm_domain field points to the | |
991 | * domain member of an object of type struct generic_pm_domain representing | |
992 | * a PM domain consisting of I/O devices. | |
993 | */ | |
994 | static int pm_genpd_suspend(struct device *dev) | |
995 | { | |
996 | struct generic_pm_domain *genpd; | |
997 | ||
998 | dev_dbg(dev, "%s()\n", __func__); | |
999 | ||
1000 | genpd = dev_to_genpd(dev); | |
1001 | if (IS_ERR(genpd)) | |
1002 | return -EINVAL; | |
1003 | ||
1e0407ca | 1004 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
1005 | } |
1006 | ||
1007 | /** | |
0496c8ae | 1008 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
1009 | * @dev: Device to suspend. |
1010 | * | |
1011 | * Carry out a late suspend of a device under the assumption that its | |
1012 | * pm_domain field points to the domain member of an object of type | |
1013 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
1014 | */ | |
0496c8ae | 1015 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
1016 | { |
1017 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1018 | |
1019 | dev_dbg(dev, "%s()\n", __func__); | |
1020 | ||
1021 | genpd = dev_to_genpd(dev); | |
1022 | if (IS_ERR(genpd)) | |
1023 | return -EINVAL; | |
1024 | ||
1e0407ca | 1025 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 1026 | } |
596ba34b | 1027 | |
0496c8ae RW |
1028 | /** |
1029 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
1030 | * @dev: Device to suspend. | |
1031 | * | |
1032 | * Stop the device and remove power from the domain if all devices in it have | |
1033 | * been stopped. | |
1034 | */ | |
1035 | static int pm_genpd_suspend_noirq(struct device *dev) | |
1036 | { | |
1037 | struct generic_pm_domain *genpd; | |
1038 | ||
1039 | dev_dbg(dev, "%s()\n", __func__); | |
1040 | ||
1041 | genpd = dev_to_genpd(dev); | |
1042 | if (IS_ERR(genpd)) | |
1043 | return -EINVAL; | |
596ba34b | 1044 | |
dbf37414 | 1045 | if (genpd->suspend_power_off |
0496c8ae | 1046 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
1047 | return 0; |
1048 | ||
d5e4cbfe | 1049 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
1050 | |
1051 | /* | |
1052 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1053 | * guaranteed that this function will never run twice in parallel for | |
1054 | * the same PM domain, so it is not necessary to use locking here. | |
1055 | */ | |
1056 | genpd->suspended_count++; | |
1057 | pm_genpd_sync_poweroff(genpd); | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | /** | |
0496c8ae | 1063 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1064 | * @dev: Device to resume. |
1065 | * | |
0496c8ae | 1066 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
1067 | */ |
1068 | static int pm_genpd_resume_noirq(struct device *dev) | |
1069 | { | |
1070 | struct generic_pm_domain *genpd; | |
1071 | ||
1072 | dev_dbg(dev, "%s()\n", __func__); | |
1073 | ||
1074 | genpd = dev_to_genpd(dev); | |
1075 | if (IS_ERR(genpd)) | |
1076 | return -EINVAL; | |
1077 | ||
dbf37414 | 1078 | if (genpd->suspend_power_off |
cc85b207 | 1079 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
1080 | return 0; |
1081 | ||
1082 | /* | |
1083 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1084 | * guaranteed that this function will never run twice in parallel for | |
1085 | * the same PM domain, so it is not necessary to use locking here. | |
1086 | */ | |
802d8b49 | 1087 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1088 | genpd->suspended_count--; |
596ba34b | 1089 | |
0496c8ae | 1090 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1091 | } |
1092 | ||
1093 | /** | |
0496c8ae RW |
1094 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1095 | * @dev: Device to resume. | |
1096 | * | |
1097 | * Carry out an early resume of a device under the assumption that its | |
1098 | * pm_domain field points to the domain member of an object of type | |
1099 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1100 | * devices. | |
1101 | */ | |
1102 | static int pm_genpd_resume_early(struct device *dev) | |
1103 | { | |
1104 | struct generic_pm_domain *genpd; | |
1105 | ||
1106 | dev_dbg(dev, "%s()\n", __func__); | |
1107 | ||
1108 | genpd = dev_to_genpd(dev); | |
1109 | if (IS_ERR(genpd)) | |
1110 | return -EINVAL; | |
1111 | ||
1e0407ca | 1112 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
1113 | } |
1114 | ||
1115 | /** | |
1116 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
1117 | * @dev: Device to resume. |
1118 | * | |
1119 | * Resume a device under the assumption that its pm_domain field points to the | |
1120 | * domain member of an object of type struct generic_pm_domain representing | |
1121 | * a power domain consisting of I/O devices. | |
1122 | */ | |
1123 | static int pm_genpd_resume(struct device *dev) | |
1124 | { | |
1125 | struct generic_pm_domain *genpd; | |
1126 | ||
1127 | dev_dbg(dev, "%s()\n", __func__); | |
1128 | ||
1129 | genpd = dev_to_genpd(dev); | |
1130 | if (IS_ERR(genpd)) | |
1131 | return -EINVAL; | |
1132 | ||
1e0407ca | 1133 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
1134 | } |
1135 | ||
1136 | /** | |
0496c8ae | 1137 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
1138 | * @dev: Device to freeze. |
1139 | * | |
1140 | * Freeze a device under the assumption that its pm_domain field points to the | |
1141 | * domain member of an object of type struct generic_pm_domain representing | |
1142 | * a power domain consisting of I/O devices. | |
1143 | */ | |
1144 | static int pm_genpd_freeze(struct device *dev) | |
1145 | { | |
1146 | struct generic_pm_domain *genpd; | |
1147 | ||
1148 | dev_dbg(dev, "%s()\n", __func__); | |
1149 | ||
1150 | genpd = dev_to_genpd(dev); | |
1151 | if (IS_ERR(genpd)) | |
1152 | return -EINVAL; | |
1153 | ||
1e0407ca | 1154 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
1155 | } |
1156 | ||
1157 | /** | |
0496c8ae RW |
1158 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1159 | * @dev: Device to freeze. | |
1160 | * | |
1161 | * Carry out a late freeze of a device under the assumption that its | |
1162 | * pm_domain field points to the domain member of an object of type | |
1163 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1164 | * devices. | |
1165 | */ | |
1166 | static int pm_genpd_freeze_late(struct device *dev) | |
1167 | { | |
1168 | struct generic_pm_domain *genpd; | |
1169 | ||
1170 | dev_dbg(dev, "%s()\n", __func__); | |
1171 | ||
1172 | genpd = dev_to_genpd(dev); | |
1173 | if (IS_ERR(genpd)) | |
1174 | return -EINVAL; | |
1175 | ||
1e0407ca | 1176 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
1177 | } |
1178 | ||
1179 | /** | |
1180 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1181 | * @dev: Device to freeze. |
1182 | * | |
1183 | * Carry out a late freeze of a device under the assumption that its | |
1184 | * pm_domain field points to the domain member of an object of type | |
1185 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1186 | * devices. | |
1187 | */ | |
1188 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1189 | { | |
1190 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1191 | |
1192 | dev_dbg(dev, "%s()\n", __func__); | |
1193 | ||
1194 | genpd = dev_to_genpd(dev); | |
1195 | if (IS_ERR(genpd)) | |
1196 | return -EINVAL; | |
1197 | ||
dbf37414 | 1198 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1199 | } |
596ba34b | 1200 | |
0496c8ae RW |
1201 | /** |
1202 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1203 | * @dev: Device to thaw. | |
1204 | * | |
1205 | * Start the device, unless power has been removed from the domain already | |
1206 | * before the system transition. | |
1207 | */ | |
1208 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1209 | { | |
1210 | struct generic_pm_domain *genpd; | |
596ba34b | 1211 | |
0496c8ae | 1212 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1213 | |
0496c8ae RW |
1214 | genpd = dev_to_genpd(dev); |
1215 | if (IS_ERR(genpd)) | |
1216 | return -EINVAL; | |
1217 | ||
dbf37414 | 1218 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
1219 | } |
1220 | ||
1221 | /** | |
0496c8ae | 1222 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1223 | * @dev: Device to thaw. |
1224 | * | |
1225 | * Carry out an early thaw of a device under the assumption that its | |
1226 | * pm_domain field points to the domain member of an object of type | |
1227 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1228 | * devices. | |
1229 | */ | |
0496c8ae | 1230 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1231 | { |
1232 | struct generic_pm_domain *genpd; | |
1233 | ||
1234 | dev_dbg(dev, "%s()\n", __func__); | |
1235 | ||
1236 | genpd = dev_to_genpd(dev); | |
1237 | if (IS_ERR(genpd)) | |
1238 | return -EINVAL; | |
1239 | ||
1e0407ca | 1240 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1241 | } |
1242 | ||
1243 | /** | |
1244 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1245 | * @dev: Device to thaw. | |
1246 | * | |
1247 | * Thaw a device under the assumption that its pm_domain field points to the | |
1248 | * domain member of an object of type struct generic_pm_domain representing | |
1249 | * a power domain consisting of I/O devices. | |
1250 | */ | |
1251 | static int pm_genpd_thaw(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 | ||
1e0407ca | 1261 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1262 | } |
1263 | ||
1264 | /** | |
0496c8ae | 1265 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1266 | * @dev: Device to resume. |
1267 | * | |
0496c8ae RW |
1268 | * Make sure the domain will be in the same power state as before the |
1269 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1270 | */ |
1271 | static int pm_genpd_restore_noirq(struct device *dev) | |
1272 | { | |
1273 | struct generic_pm_domain *genpd; | |
1274 | ||
1275 | dev_dbg(dev, "%s()\n", __func__); | |
1276 | ||
1277 | genpd = dev_to_genpd(dev); | |
1278 | if (IS_ERR(genpd)) | |
1279 | return -EINVAL; | |
1280 | ||
1281 | /* | |
1282 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1283 | * guaranteed that this function will never run twice in parallel for | |
1284 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1285 | * |
1286 | * At this point suspended_count == 0 means we are being run for the | |
1287 | * first time for the given domain in the present cycle. | |
596ba34b | 1288 | */ |
65533bbf | 1289 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1290 | /* |
65533bbf | 1291 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1292 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1293 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1294 | */ |
65533bbf RW |
1295 | genpd->status = GPD_STATE_POWER_OFF; |
1296 | if (genpd->suspend_power_off) { | |
1297 | /* | |
1298 | * If the domain was off before the hibernation, make | |
1299 | * sure it will be off going forward. | |
1300 | */ | |
c8f0ea45 | 1301 | genpd_power_off(genpd); |
65533bbf RW |
1302 | |
1303 | return 0; | |
1304 | } | |
596ba34b RW |
1305 | } |
1306 | ||
18dd2ece RW |
1307 | if (genpd->suspend_power_off) |
1308 | return 0; | |
1309 | ||
802d8b49 | 1310 | pm_genpd_sync_poweron(genpd); |
596ba34b | 1311 | |
dbf37414 | 1312 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1313 | } |
1314 | ||
1315 | /** | |
1316 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1317 | * @dev: Device to complete the transition of. | |
1318 | * | |
1319 | * Complete a power transition of a device (during a system-wide power | |
1320 | * transition) under the assumption that its pm_domain field points to the | |
1321 | * domain member of an object of type struct generic_pm_domain representing | |
1322 | * a power domain consisting of I/O devices. | |
1323 | */ | |
1324 | static void pm_genpd_complete(struct device *dev) | |
1325 | { | |
1326 | struct generic_pm_domain *genpd; | |
1327 | bool run_complete; | |
1328 | ||
1329 | dev_dbg(dev, "%s()\n", __func__); | |
1330 | ||
1331 | genpd = dev_to_genpd(dev); | |
1332 | if (IS_ERR(genpd)) | |
1333 | return; | |
1334 | ||
1335 | mutex_lock(&genpd->lock); | |
1336 | ||
1337 | run_complete = !genpd->suspend_power_off; | |
1338 | if (--genpd->prepared_count == 0) | |
1339 | genpd->suspend_power_off = false; | |
1340 | ||
1341 | mutex_unlock(&genpd->lock); | |
1342 | ||
1343 | if (run_complete) { | |
1344 | pm_generic_complete(dev); | |
6f00ff78 | 1345 | pm_runtime_set_active(dev); |
596ba34b | 1346 | pm_runtime_enable(dev); |
af939339 | 1347 | pm_request_idle(dev); |
596ba34b RW |
1348 | } |
1349 | } | |
1350 | ||
77f827de | 1351 | /** |
d47e6464 | 1352 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1353 | * @dev: Device that normally is marked as "always on" to switch power for. |
1354 | * | |
1355 | * This routine may only be called during the system core (syscore) suspend or | |
1356 | * resume phase for devices whose "always on" flags are set. | |
1357 | */ | |
d47e6464 | 1358 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1359 | { |
1360 | struct generic_pm_domain *genpd; | |
1361 | ||
1362 | genpd = dev_to_genpd(dev); | |
1363 | if (!pm_genpd_present(genpd)) | |
1364 | return; | |
1365 | ||
1366 | if (suspend) { | |
1367 | genpd->suspended_count++; | |
1368 | pm_genpd_sync_poweroff(genpd); | |
1369 | } else { | |
1370 | pm_genpd_sync_poweron(genpd); | |
1371 | genpd->suspended_count--; | |
1372 | } | |
1373 | } | |
d47e6464 UH |
1374 | |
1375 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1376 | { | |
1377 | genpd_syscore_switch(dev, true); | |
1378 | } | |
1379 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1380 | ||
1381 | void pm_genpd_syscore_poweron(struct device *dev) | |
1382 | { | |
1383 | genpd_syscore_switch(dev, false); | |
1384 | } | |
1385 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1386 | |
596ba34b RW |
1387 | #else |
1388 | ||
1389 | #define pm_genpd_prepare NULL | |
1390 | #define pm_genpd_suspend NULL | |
0496c8ae | 1391 | #define pm_genpd_suspend_late NULL |
596ba34b | 1392 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1393 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1394 | #define pm_genpd_resume_noirq NULL |
1395 | #define pm_genpd_resume NULL | |
1396 | #define pm_genpd_freeze NULL | |
0496c8ae | 1397 | #define pm_genpd_freeze_late NULL |
596ba34b | 1398 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1399 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1400 | #define pm_genpd_thaw_noirq NULL |
1401 | #define pm_genpd_thaw NULL | |
596ba34b | 1402 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1403 | #define pm_genpd_complete NULL |
1404 | ||
1405 | #endif /* CONFIG_PM_SLEEP */ | |
1406 | ||
1d5fcfec RW |
1407 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1408 | { | |
1409 | struct generic_pm_domain_data *gpd_data; | |
1410 | ||
1411 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
1412 | if (!gpd_data) | |
1413 | return NULL; | |
1414 | ||
1415 | mutex_init(&gpd_data->lock); | |
1416 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1417 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1418 | return gpd_data; | |
1419 | } | |
1420 | ||
1421 | static void __pm_genpd_free_dev_data(struct device *dev, | |
1422 | struct generic_pm_domain_data *gpd_data) | |
1423 | { | |
1424 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1425 | kfree(gpd_data); | |
1426 | } | |
1427 | ||
f721889f | 1428 | /** |
b02c999a | 1429 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1430 | * @genpd: PM domain to add the device to. |
1431 | * @dev: Device to be added. | |
b02c999a | 1432 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1433 | */ |
b02c999a RW |
1434 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1435 | struct gpd_timing_data *td) | |
f721889f | 1436 | { |
1d5fcfec | 1437 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
4605ab65 | 1438 | struct pm_domain_data *pdd; |
f721889f RW |
1439 | int ret = 0; |
1440 | ||
1441 | dev_dbg(dev, "%s()\n", __func__); | |
1442 | ||
1443 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1444 | return -EINVAL; | |
1445 | ||
1d5fcfec RW |
1446 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1447 | if (!gpd_data_new) | |
6ff7bb0d RW |
1448 | return -ENOMEM; |
1449 | ||
17b75eca | 1450 | genpd_acquire_lock(genpd); |
f721889f | 1451 | |
596ba34b RW |
1452 | if (genpd->prepared_count > 0) { |
1453 | ret = -EAGAIN; | |
1454 | goto out; | |
1455 | } | |
1456 | ||
4605ab65 RW |
1457 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1458 | if (pdd->dev == dev) { | |
f721889f RW |
1459 | ret = -EINVAL; |
1460 | goto out; | |
1461 | } | |
1462 | ||
1d5fcfec RW |
1463 | ret = dev_pm_get_subsys_data(dev); |
1464 | if (ret) | |
1465 | goto out; | |
1466 | ||
596ba34b | 1467 | genpd->device_count++; |
6ff7bb0d | 1468 | genpd->max_off_time_changed = true; |
f721889f | 1469 | |
6ff7bb0d | 1470 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1471 | |
6ff7bb0d | 1472 | dev->pm_domain = &genpd->domain; |
1d5fcfec RW |
1473 | if (dev->power.subsys_data->domain_data) { |
1474 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1475 | } else { | |
1476 | gpd_data = gpd_data_new; | |
1477 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1478 | } | |
1479 | gpd_data->refcount++; | |
b02c999a RW |
1480 | if (td) |
1481 | gpd_data->td = *td; | |
f721889f | 1482 | |
1d5fcfec RW |
1483 | spin_unlock_irq(&dev->power.lock); |
1484 | ||
d79b6fe1 | 1485 | if (genpd->attach_dev) |
c16561e8 | 1486 | genpd->attach_dev(genpd, dev); |
d79b6fe1 | 1487 | |
1d5fcfec RW |
1488 | mutex_lock(&gpd_data->lock); |
1489 | gpd_data->base.dev = dev; | |
1490 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); | |
67732cd3 | 1491 | gpd_data->need_restore = -1; |
6ff7bb0d RW |
1492 | gpd_data->td.constraint_changed = true; |
1493 | gpd_data->td.effective_constraint_ns = -1; | |
6ff7bb0d RW |
1494 | mutex_unlock(&gpd_data->lock); |
1495 | ||
f721889f | 1496 | out: |
17b75eca | 1497 | genpd_release_lock(genpd); |
f721889f | 1498 | |
1d5fcfec RW |
1499 | if (gpd_data != gpd_data_new) |
1500 | __pm_genpd_free_dev_data(dev, gpd_data_new); | |
1501 | ||
f721889f RW |
1502 | return ret; |
1503 | } | |
1504 | ||
b5abb085 RW |
1505 | /** |
1506 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1507 | * @domain_name: Name of the PM domain to add the device to. | |
1508 | * @dev: Device to be added. | |
1509 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1510 | */ | |
1511 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1512 | struct gpd_timing_data *td) | |
1513 | { | |
8bc0251d | 1514 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1515 | } |
1516 | ||
f721889f RW |
1517 | /** |
1518 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1519 | * @genpd: PM domain to remove the device from. | |
1520 | * @dev: Device to be removed. | |
1521 | */ | |
1522 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1523 | struct device *dev) | |
1524 | { | |
6ff7bb0d | 1525 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1526 | struct pm_domain_data *pdd; |
1d5fcfec | 1527 | bool remove = false; |
efa69025 | 1528 | int ret = 0; |
f721889f RW |
1529 | |
1530 | dev_dbg(dev, "%s()\n", __func__); | |
1531 | ||
efa69025 RW |
1532 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1533 | || IS_ERR_OR_NULL(dev->pm_domain) | |
1534 | || pd_to_genpd(dev->pm_domain) != genpd) | |
f721889f RW |
1535 | return -EINVAL; |
1536 | ||
17b75eca | 1537 | genpd_acquire_lock(genpd); |
f721889f | 1538 | |
596ba34b RW |
1539 | if (genpd->prepared_count > 0) { |
1540 | ret = -EAGAIN; | |
1541 | goto out; | |
1542 | } | |
1543 | ||
6ff7bb0d RW |
1544 | genpd->device_count--; |
1545 | genpd->max_off_time_changed = true; | |
1546 | ||
d79b6fe1 | 1547 | if (genpd->detach_dev) |
c16561e8 | 1548 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1549 | |
6ff7bb0d | 1550 | spin_lock_irq(&dev->power.lock); |
1d5fcfec | 1551 | |
efa69025 RW |
1552 | dev->pm_domain = NULL; |
1553 | pdd = dev->power.subsys_data->domain_data; | |
1554 | list_del_init(&pdd->list_node); | |
1d5fcfec RW |
1555 | gpd_data = to_gpd_data(pdd); |
1556 | if (--gpd_data->refcount == 0) { | |
1557 | dev->power.subsys_data->domain_data = NULL; | |
1558 | remove = true; | |
1559 | } | |
1560 | ||
6ff7bb0d | 1561 | spin_unlock_irq(&dev->power.lock); |
f721889f | 1562 | |
6ff7bb0d RW |
1563 | mutex_lock(&gpd_data->lock); |
1564 | pdd->dev = NULL; | |
1565 | mutex_unlock(&gpd_data->lock); | |
1566 | ||
1567 | genpd_release_lock(genpd); | |
1568 | ||
6ff7bb0d | 1569 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1570 | if (remove) |
1571 | __pm_genpd_free_dev_data(dev, gpd_data); | |
1572 | ||
6ff7bb0d | 1573 | return 0; |
f721889f | 1574 | |
596ba34b | 1575 | out: |
17b75eca | 1576 | genpd_release_lock(genpd); |
f721889f RW |
1577 | |
1578 | return ret; | |
1579 | } | |
1580 | ||
ca1d72f0 RW |
1581 | /** |
1582 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. | |
1583 | * @dev: Device to set/unset the flag for. | |
1584 | * @val: The new value of the device's "need restore" flag. | |
1585 | */ | |
1586 | void pm_genpd_dev_need_restore(struct device *dev, bool val) | |
1587 | { | |
1588 | struct pm_subsys_data *psd; | |
1589 | unsigned long flags; | |
1590 | ||
1591 | spin_lock_irqsave(&dev->power.lock, flags); | |
1592 | ||
1593 | psd = dev_to_psd(dev); | |
1594 | if (psd && psd->domain_data) | |
67732cd3 | 1595 | to_gpd_data(psd->domain_data)->need_restore = val ? 1 : 0; |
ca1d72f0 RW |
1596 | |
1597 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1598 | } | |
1599 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); | |
1600 | ||
f721889f RW |
1601 | /** |
1602 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1603 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1604 | * @subdomain: Subdomain to be added. |
f721889f RW |
1605 | */ |
1606 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1607 | struct generic_pm_domain *subdomain) |
f721889f | 1608 | { |
5063ce15 | 1609 | struct gpd_link *link; |
f721889f RW |
1610 | int ret = 0; |
1611 | ||
fb7268be RW |
1612 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1613 | || genpd == subdomain) | |
f721889f RW |
1614 | return -EINVAL; |
1615 | ||
17b75eca RW |
1616 | start: |
1617 | genpd_acquire_lock(genpd); | |
bc0403ff | 1618 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1619 | |
bc0403ff RW |
1620 | if (subdomain->status != GPD_STATE_POWER_OFF |
1621 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1622 | mutex_unlock(&subdomain->lock); | |
17b75eca RW |
1623 | genpd_release_lock(genpd); |
1624 | goto start; | |
1625 | } | |
1626 | ||
1627 | if (genpd->status == GPD_STATE_POWER_OFF | |
bc0403ff | 1628 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1629 | ret = -EINVAL; |
1630 | goto out; | |
1631 | } | |
1632 | ||
4fcac10d | 1633 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1634 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1635 | ret = -EINVAL; |
1636 | goto out; | |
1637 | } | |
1638 | } | |
1639 | ||
5063ce15 RW |
1640 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1641 | if (!link) { | |
1642 | ret = -ENOMEM; | |
1643 | goto out; | |
1644 | } | |
1645 | link->master = genpd; | |
1646 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1647 | link->slave = subdomain; |
1648 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1649 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1650 | genpd_sd_counter_inc(genpd); |
f721889f | 1651 | |
f721889f | 1652 | out: |
bc0403ff | 1653 | mutex_unlock(&subdomain->lock); |
17b75eca | 1654 | genpd_release_lock(genpd); |
f721889f RW |
1655 | |
1656 | return ret; | |
1657 | } | |
1658 | ||
fb7268be RW |
1659 | /** |
1660 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1661 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1662 | * @subdomain_name: Name of the subdomain to be added. | |
1663 | */ | |
1664 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1665 | const char *subdomain_name) | |
1666 | { | |
1667 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1668 | ||
1669 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1670 | return -EINVAL; | |
1671 | ||
1672 | mutex_lock(&gpd_list_lock); | |
1673 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1674 | if (!master && !strcmp(gpd->name, master_name)) | |
1675 | master = gpd; | |
1676 | ||
1677 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1678 | subdomain = gpd; | |
1679 | ||
1680 | if (master && subdomain) | |
1681 | break; | |
1682 | } | |
1683 | mutex_unlock(&gpd_list_lock); | |
1684 | ||
1685 | return pm_genpd_add_subdomain(master, subdomain); | |
1686 | } | |
1687 | ||
f721889f RW |
1688 | /** |
1689 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1690 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1691 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1692 | */ |
1693 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1694 | struct generic_pm_domain *subdomain) |
f721889f | 1695 | { |
5063ce15 | 1696 | struct gpd_link *link; |
f721889f RW |
1697 | int ret = -EINVAL; |
1698 | ||
5063ce15 | 1699 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1700 | return -EINVAL; |
1701 | ||
17b75eca RW |
1702 | start: |
1703 | genpd_acquire_lock(genpd); | |
f721889f | 1704 | |
5063ce15 RW |
1705 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1706 | if (link->slave != subdomain) | |
f721889f RW |
1707 | continue; |
1708 | ||
1709 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1710 | ||
17b75eca RW |
1711 | if (subdomain->status != GPD_STATE_POWER_OFF |
1712 | && subdomain->status != GPD_STATE_ACTIVE) { | |
1713 | mutex_unlock(&subdomain->lock); | |
1714 | genpd_release_lock(genpd); | |
1715 | goto start; | |
1716 | } | |
1717 | ||
5063ce15 RW |
1718 | list_del(&link->master_node); |
1719 | list_del(&link->slave_node); | |
1720 | kfree(link); | |
17b75eca | 1721 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1722 | genpd_sd_counter_dec(genpd); |
1723 | ||
1724 | mutex_unlock(&subdomain->lock); | |
1725 | ||
1726 | ret = 0; | |
1727 | break; | |
1728 | } | |
1729 | ||
17b75eca | 1730 | genpd_release_lock(genpd); |
f721889f RW |
1731 | |
1732 | return ret; | |
1733 | } | |
1734 | ||
40114447 RW |
1735 | /** |
1736 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1737 | * @genpd: PM domain to be connected with cpuidle. | |
1738 | * @state: cpuidle state this domain can disable/enable. | |
1739 | * | |
1740 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1741 | * of calling its power down routine it will enable the given cpuidle state so | |
1742 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1743 | */ | |
1744 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1745 | { |
1746 | struct cpuidle_driver *cpuidle_drv; | |
f39cb179 | 1747 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1748 | struct cpuidle_state *idle_state; |
1749 | int ret = 0; | |
1750 | ||
1751 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1752 | return -EINVAL; | |
1753 | ||
1754 | genpd_acquire_lock(genpd); | |
1755 | ||
f39cb179 | 1756 | if (genpd->cpuidle_data) { |
cbc9ef02 RW |
1757 | ret = -EEXIST; |
1758 | goto out; | |
1759 | } | |
f39cb179 UH |
1760 | cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); |
1761 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1762 | ret = -ENOMEM; |
1763 | goto out; | |
1764 | } | |
1765 | cpuidle_drv = cpuidle_driver_ref(); | |
1766 | if (!cpuidle_drv) { | |
1767 | ret = -ENODEV; | |
debe081a | 1768 | goto err_drv; |
cbc9ef02 RW |
1769 | } |
1770 | if (cpuidle_drv->state_count <= state) { | |
1771 | ret = -EINVAL; | |
1772 | goto err; | |
1773 | } | |
1774 | idle_state = &cpuidle_drv->states[state]; | |
1775 | if (!idle_state->disabled) { | |
1776 | ret = -EAGAIN; | |
1777 | goto err; | |
1778 | } | |
f39cb179 UH |
1779 | cpuidle_data->idle_state = idle_state; |
1780 | cpuidle_data->saved_exit_latency = idle_state->exit_latency; | |
1781 | genpd->cpuidle_data = cpuidle_data; | |
cbc9ef02 RW |
1782 | genpd_recalc_cpu_exit_latency(genpd); |
1783 | ||
1784 | out: | |
1785 | genpd_release_lock(genpd); | |
1786 | return ret; | |
1787 | ||
1788 | err: | |
1789 | cpuidle_driver_unref(); | |
debe081a | 1790 | |
1791 | err_drv: | |
f39cb179 | 1792 | kfree(cpuidle_data); |
cbc9ef02 RW |
1793 | goto out; |
1794 | } | |
1795 | ||
74a2799a RW |
1796 | /** |
1797 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1798 | * @name: Name of the domain to connect to cpuidle. | |
1799 | * @state: cpuidle state this domain can manipulate. | |
1800 | */ | |
1801 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1802 | { | |
1803 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1804 | } | |
1805 | ||
40114447 RW |
1806 | /** |
1807 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1808 | * @genpd: PM domain to remove the cpuidle connection from. | |
1809 | * | |
1810 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1811 | * given PM domain. | |
1812 | */ | |
1813 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 | 1814 | { |
f39cb179 | 1815 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1816 | struct cpuidle_state *idle_state; |
1817 | int ret = 0; | |
1818 | ||
1819 | if (IS_ERR_OR_NULL(genpd)) | |
1820 | return -EINVAL; | |
1821 | ||
1822 | genpd_acquire_lock(genpd); | |
1823 | ||
f39cb179 UH |
1824 | cpuidle_data = genpd->cpuidle_data; |
1825 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1826 | ret = -ENODEV; |
1827 | goto out; | |
1828 | } | |
f39cb179 | 1829 | idle_state = cpuidle_data->idle_state; |
cbc9ef02 RW |
1830 | if (!idle_state->disabled) { |
1831 | ret = -EAGAIN; | |
1832 | goto out; | |
1833 | } | |
f39cb179 | 1834 | idle_state->exit_latency = cpuidle_data->saved_exit_latency; |
cbc9ef02 | 1835 | cpuidle_driver_unref(); |
f39cb179 UH |
1836 | genpd->cpuidle_data = NULL; |
1837 | kfree(cpuidle_data); | |
cbc9ef02 RW |
1838 | |
1839 | out: | |
1840 | genpd_release_lock(genpd); | |
1841 | return ret; | |
1842 | } | |
1843 | ||
74a2799a RW |
1844 | /** |
1845 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1846 | * @name: Name of the domain to disconnect cpuidle from. | |
1847 | */ | |
1848 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1849 | { | |
1850 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1851 | } | |
1852 | ||
d23b9b00 RW |
1853 | /* Default device callbacks for generic PM domains. */ |
1854 | ||
ecf00475 | 1855 | /** |
12e10bb6 | 1856 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1857 | * @dev: Device to handle. |
1858 | */ | |
1859 | static int pm_genpd_default_save_state(struct device *dev) | |
1860 | { | |
1861 | int (*cb)(struct device *__dev); | |
ecf00475 | 1862 | |
0b589741 RW |
1863 | if (dev->type && dev->type->pm) |
1864 | cb = dev->type->pm->runtime_suspend; | |
1865 | else if (dev->class && dev->class->pm) | |
1866 | cb = dev->class->pm->runtime_suspend; | |
1867 | else if (dev->bus && dev->bus->pm) | |
1868 | cb = dev->bus->pm->runtime_suspend; | |
1869 | else | |
1870 | cb = NULL; | |
ecf00475 | 1871 | |
0b589741 RW |
1872 | if (!cb && dev->driver && dev->driver->pm) |
1873 | cb = dev->driver->pm->runtime_suspend; | |
1874 | ||
1875 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1876 | } |
1877 | ||
1878 | /** | |
12e10bb6 | 1879 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1880 | * @dev: Device to handle. |
1881 | */ | |
1882 | static int pm_genpd_default_restore_state(struct device *dev) | |
1883 | { | |
1884 | int (*cb)(struct device *__dev); | |
ecf00475 | 1885 | |
0b589741 RW |
1886 | if (dev->type && dev->type->pm) |
1887 | cb = dev->type->pm->runtime_resume; | |
1888 | else if (dev->class && dev->class->pm) | |
1889 | cb = dev->class->pm->runtime_resume; | |
1890 | else if (dev->bus && dev->bus->pm) | |
1891 | cb = dev->bus->pm->runtime_resume; | |
1892 | else | |
1893 | cb = NULL; | |
ecf00475 | 1894 | |
0b589741 RW |
1895 | if (!cb && dev->driver && dev->driver->pm) |
1896 | cb = dev->driver->pm->runtime_resume; | |
1897 | ||
1898 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1899 | } |
1900 | ||
f721889f RW |
1901 | /** |
1902 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1903 | * @genpd: PM domain object to initialize. | |
1904 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1905 | * @is_off: Initial value of the domain's power_is_off field. | |
1906 | */ | |
1907 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1908 | struct dev_power_governor *gov, bool is_off) | |
1909 | { | |
1910 | if (IS_ERR_OR_NULL(genpd)) | |
1911 | return; | |
1912 | ||
5063ce15 RW |
1913 | INIT_LIST_HEAD(&genpd->master_links); |
1914 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1915 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1916 | mutex_init(&genpd->lock); |
1917 | genpd->gov = gov; | |
1918 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1919 | genpd->in_progress = 0; | |
c4bb3160 | 1920 | atomic_set(&genpd->sd_count, 0); |
17b75eca RW |
1921 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
1922 | init_waitqueue_head(&genpd->status_wait_queue); | |
c6d22b37 RW |
1923 | genpd->poweroff_task = NULL; |
1924 | genpd->resume_count = 0; | |
596ba34b | 1925 | genpd->device_count = 0; |
221e9b58 | 1926 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1927 | genpd->max_off_time_changed = true; |
f721889f RW |
1928 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1929 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1930 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1931 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1932 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1933 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1934 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1935 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1936 | genpd->domain.ops.resume = pm_genpd_resume; |
1937 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1938 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1939 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1940 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1941 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1942 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1943 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1944 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1945 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1946 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1947 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1948 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1949 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1950 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1951 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1952 | |
1953 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1954 | genpd->dev_ops.stop = pm_clk_suspend; | |
1955 | genpd->dev_ops.start = pm_clk_resume; | |
1956 | } | |
1957 | ||
5125bbf3 RW |
1958 | mutex_lock(&gpd_list_lock); |
1959 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1960 | mutex_unlock(&gpd_list_lock); | |
1961 | } | |
aa42240a TF |
1962 | |
1963 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1964 | /* | |
1965 | * Device Tree based PM domain providers. | |
1966 | * | |
1967 | * The code below implements generic device tree based PM domain providers that | |
1968 | * bind device tree nodes with generic PM domains registered in the system. | |
1969 | * | |
1970 | * Any driver that registers generic PM domains and needs to support binding of | |
1971 | * devices to these domains is supposed to register a PM domain provider, which | |
1972 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1973 | * | |
1974 | * Two simple mapping functions have been provided for convenience: | |
1975 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1976 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1977 | * index. | |
1978 | */ | |
1979 | ||
1980 | /** | |
1981 | * struct of_genpd_provider - PM domain provider registration structure | |
1982 | * @link: Entry in global list of PM domain providers | |
1983 | * @node: Pointer to device tree node of PM domain provider | |
1984 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1985 | * into a PM domain. | |
1986 | * @data: context pointer to be passed into @xlate callback | |
1987 | */ | |
1988 | struct of_genpd_provider { | |
1989 | struct list_head link; | |
1990 | struct device_node *node; | |
1991 | genpd_xlate_t xlate; | |
1992 | void *data; | |
1993 | }; | |
1994 | ||
1995 | /* List of registered PM domain providers. */ | |
1996 | static LIST_HEAD(of_genpd_providers); | |
1997 | /* Mutex to protect the list above. */ | |
1998 | static DEFINE_MUTEX(of_genpd_mutex); | |
1999 | ||
2000 | /** | |
2001 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
2002 | * @genpdspec: OF phandle args to map into a PM domain | |
2003 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
2004 | * | |
2005 | * This is a generic xlate function that can be used to model PM domains that | |
2006 | * have their own device tree nodes. The private data of xlate function needs | |
2007 | * to be a valid pointer to struct generic_pm_domain. | |
2008 | */ | |
2009 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
2010 | struct of_phandle_args *genpdspec, | |
2011 | void *data) | |
2012 | { | |
2013 | if (genpdspec->args_count != 0) | |
2014 | return ERR_PTR(-EINVAL); | |
2015 | return data; | |
2016 | } | |
2017 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
2018 | ||
2019 | /** | |
2020 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
2021 | * @genpdspec: OF phandle args to map into a PM domain | |
2022 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2023 | * | |
2024 | * This is a generic xlate function that can be used to model simple PM domain | |
2025 | * controllers that have one device tree node and provide multiple PM domains. | |
2026 | * A single cell is used as an index into an array of PM domains specified in | |
2027 | * the genpd_onecell_data struct when registering the provider. | |
2028 | */ | |
2029 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
2030 | struct of_phandle_args *genpdspec, | |
2031 | void *data) | |
2032 | { | |
2033 | struct genpd_onecell_data *genpd_data = data; | |
2034 | unsigned int idx = genpdspec->args[0]; | |
2035 | ||
2036 | if (genpdspec->args_count != 1) | |
2037 | return ERR_PTR(-EINVAL); | |
2038 | ||
2039 | if (idx >= genpd_data->num_domains) { | |
2040 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2041 | return ERR_PTR(-EINVAL); | |
2042 | } | |
2043 | ||
2044 | if (!genpd_data->domains[idx]) | |
2045 | return ERR_PTR(-ENOENT); | |
2046 | ||
2047 | return genpd_data->domains[idx]; | |
2048 | } | |
2049 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
2050 | ||
2051 | /** | |
2052 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
2053 | * @np: Device node pointer associated with the PM domain provider. | |
2054 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2055 | * @data: Context pointer for @xlate callback. | |
2056 | */ | |
2057 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
2058 | void *data) | |
2059 | { | |
2060 | struct of_genpd_provider *cp; | |
2061 | ||
2062 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2063 | if (!cp) | |
2064 | return -ENOMEM; | |
2065 | ||
2066 | cp->node = of_node_get(np); | |
2067 | cp->data = data; | |
2068 | cp->xlate = xlate; | |
2069 | ||
2070 | mutex_lock(&of_genpd_mutex); | |
2071 | list_add(&cp->link, &of_genpd_providers); | |
2072 | mutex_unlock(&of_genpd_mutex); | |
2073 | pr_debug("Added domain provider from %s\n", np->full_name); | |
2074 | ||
2075 | return 0; | |
2076 | } | |
2077 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
2078 | ||
2079 | /** | |
2080 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2081 | * @np: Device node pointer associated with the PM domain provider | |
2082 | */ | |
2083 | void of_genpd_del_provider(struct device_node *np) | |
2084 | { | |
2085 | struct of_genpd_provider *cp; | |
2086 | ||
2087 | mutex_lock(&of_genpd_mutex); | |
2088 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
2089 | if (cp->node == np) { | |
2090 | list_del(&cp->link); | |
2091 | of_node_put(cp->node); | |
2092 | kfree(cp); | |
2093 | break; | |
2094 | } | |
2095 | } | |
2096 | mutex_unlock(&of_genpd_mutex); | |
2097 | } | |
2098 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2099 | ||
2100 | /** | |
2101 | * of_genpd_get_from_provider() - Look-up PM domain | |
2102 | * @genpdspec: OF phandle args to use for look-up | |
2103 | * | |
2104 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2105 | * found, uses xlate function of the provider to map phandle args to a PM | |
2106 | * domain. | |
2107 | * | |
2108 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2109 | * on failure. | |
2110 | */ | |
2111 | static struct generic_pm_domain *of_genpd_get_from_provider( | |
2112 | struct of_phandle_args *genpdspec) | |
2113 | { | |
2114 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2115 | struct of_genpd_provider *provider; | |
2116 | ||
2117 | mutex_lock(&of_genpd_mutex); | |
2118 | ||
2119 | /* Check if we have such a provider in our array */ | |
2120 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2121 | if (provider->node == genpdspec->np) | |
2122 | genpd = provider->xlate(genpdspec, provider->data); | |
2123 | if (!IS_ERR(genpd)) | |
2124 | break; | |
2125 | } | |
2126 | ||
2127 | mutex_unlock(&of_genpd_mutex); | |
2128 | ||
2129 | return genpd; | |
2130 | } | |
2131 | ||
2132 | /** | |
2133 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
2134 | * @dev: Device to attach. | |
2135 | * @power_off: Currently not used | |
2136 | * | |
2137 | * Try to locate a corresponding generic PM domain, which the device was | |
2138 | * attached to previously. If such is found, the device is detached from it. | |
2139 | */ | |
2140 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2141 | { | |
2142 | struct generic_pm_domain *pd = NULL, *gpd; | |
2143 | int ret = 0; | |
2144 | ||
2145 | if (!dev->pm_domain) | |
2146 | return; | |
2147 | ||
2148 | mutex_lock(&gpd_list_lock); | |
2149 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2150 | if (&gpd->domain == dev->pm_domain) { | |
2151 | pd = gpd; | |
2152 | break; | |
2153 | } | |
2154 | } | |
2155 | mutex_unlock(&gpd_list_lock); | |
2156 | ||
2157 | if (!pd) | |
2158 | return; | |
2159 | ||
2160 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2161 | ||
2162 | while (1) { | |
2163 | ret = pm_genpd_remove_device(pd, dev); | |
2164 | if (ret != -EAGAIN) | |
2165 | break; | |
2166 | cond_resched(); | |
2167 | } | |
2168 | ||
2169 | if (ret < 0) { | |
2170 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2171 | pd->name, ret); | |
2172 | return; | |
2173 | } | |
2174 | ||
2175 | /* Check if PM domain can be powered off after removing this device. */ | |
2176 | genpd_queue_power_off_work(pd); | |
2177 | } | |
2178 | ||
2179 | /** | |
2180 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2181 | * @dev: Device to attach. | |
2182 | * | |
2183 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2184 | * attaches the device to retrieved pm_domain ops. | |
2185 | * | |
2186 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2187 | * backwards compatibility with existing DTBs. | |
2188 | * | |
2189 | * Returns 0 on successfully attached PM domain or negative error code. | |
2190 | */ | |
2191 | int genpd_dev_pm_attach(struct device *dev) | |
2192 | { | |
2193 | struct of_phandle_args pd_args; | |
2194 | struct generic_pm_domain *pd; | |
2195 | int ret; | |
2196 | ||
2197 | if (!dev->of_node) | |
2198 | return -ENODEV; | |
2199 | ||
2200 | if (dev->pm_domain) | |
2201 | return -EEXIST; | |
2202 | ||
2203 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2204 | "#power-domain-cells", 0, &pd_args); | |
2205 | if (ret < 0) { | |
2206 | if (ret != -ENOENT) | |
2207 | return ret; | |
2208 | ||
2209 | /* | |
2210 | * Try legacy Samsung-specific bindings | |
2211 | * (for backwards compatibility of DT ABI) | |
2212 | */ | |
2213 | pd_args.args_count = 0; | |
2214 | pd_args.np = of_parse_phandle(dev->of_node, | |
2215 | "samsung,power-domain", 0); | |
2216 | if (!pd_args.np) | |
2217 | return -ENOENT; | |
2218 | } | |
2219 | ||
2220 | pd = of_genpd_get_from_provider(&pd_args); | |
2221 | if (IS_ERR(pd)) { | |
2222 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
2223 | __func__, PTR_ERR(pd)); | |
2224 | of_node_put(dev->of_node); | |
2225 | return PTR_ERR(pd); | |
2226 | } | |
2227 | ||
2228 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2229 | ||
2230 | while (1) { | |
2231 | ret = pm_genpd_add_device(pd, dev); | |
2232 | if (ret != -EAGAIN) | |
2233 | break; | |
2234 | cond_resched(); | |
2235 | } | |
2236 | ||
2237 | if (ret < 0) { | |
2238 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2239 | pd->name, ret); | |
2240 | of_node_put(dev->of_node); | |
2241 | return ret; | |
2242 | } | |
2243 | ||
2244 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
2ed12769 | 2245 | pm_genpd_poweron(pd); |
aa42240a TF |
2246 | |
2247 | return 0; | |
2248 | } | |
2249 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
2250 | #endif | |
2bd5306a MM |
2251 | |
2252 | ||
2253 | /*** debugfs support ***/ | |
2254 | ||
2255 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2256 | #include <linux/pm.h> | |
2257 | #include <linux/device.h> | |
2258 | #include <linux/debugfs.h> | |
2259 | #include <linux/seq_file.h> | |
2260 | #include <linux/init.h> | |
2261 | #include <linux/kobject.h> | |
2262 | static struct dentry *pm_genpd_debugfs_dir; | |
2263 | ||
2264 | /* | |
2265 | * TODO: This function is a slightly modified version of rtpm_status_show | |
2266 | * from sysfs.c, but dependencies between PM_GENERIC_DOMAINS and PM_RUNTIME | |
2267 | * are too loose to generalize it. | |
2268 | */ | |
2269 | #ifdef CONFIG_PM_RUNTIME | |
2270 | static void rtpm_status_str(struct seq_file *s, struct device *dev) | |
2271 | { | |
2272 | static const char * const status_lookup[] = { | |
2273 | [RPM_ACTIVE] = "active", | |
2274 | [RPM_RESUMING] = "resuming", | |
2275 | [RPM_SUSPENDED] = "suspended", | |
2276 | [RPM_SUSPENDING] = "suspending" | |
2277 | }; | |
2278 | const char *p = ""; | |
2279 | ||
2280 | if (dev->power.runtime_error) | |
2281 | p = "error"; | |
2282 | else if (dev->power.disable_depth) | |
2283 | p = "unsupported"; | |
2284 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2285 | p = status_lookup[dev->power.runtime_status]; | |
2286 | else | |
2287 | WARN_ON(1); | |
2288 | ||
2289 | seq_puts(s, p); | |
2290 | } | |
2291 | #else | |
2292 | static void rtpm_status_str(struct seq_file *s, struct device *dev) | |
2293 | { | |
2294 | seq_puts(s, "active"); | |
2295 | } | |
2296 | #endif | |
2297 | ||
2298 | static int pm_genpd_summary_one(struct seq_file *s, | |
2299 | struct generic_pm_domain *gpd) | |
2300 | { | |
2301 | static const char * const status_lookup[] = { | |
2302 | [GPD_STATE_ACTIVE] = "on", | |
2303 | [GPD_STATE_WAIT_MASTER] = "wait-master", | |
2304 | [GPD_STATE_BUSY] = "busy", | |
2305 | [GPD_STATE_REPEAT] = "off-in-progress", | |
2306 | [GPD_STATE_POWER_OFF] = "off" | |
2307 | }; | |
2308 | struct pm_domain_data *pm_data; | |
2309 | const char *kobj_path; | |
2310 | struct gpd_link *link; | |
2311 | int ret; | |
2312 | ||
2313 | ret = mutex_lock_interruptible(&gpd->lock); | |
2314 | if (ret) | |
2315 | return -ERESTARTSYS; | |
2316 | ||
2317 | if (WARN_ON(gpd->status >= ARRAY_SIZE(status_lookup))) | |
2318 | goto exit; | |
2319 | seq_printf(s, "%-30s %-15s ", gpd->name, status_lookup[gpd->status]); | |
2320 | ||
2321 | /* | |
2322 | * Modifications on the list require holding locks on both | |
2323 | * master and slave, so we are safe. | |
2324 | * Also gpd->name is immutable. | |
2325 | */ | |
2326 | list_for_each_entry(link, &gpd->master_links, master_node) { | |
2327 | seq_printf(s, "%s", link->slave->name); | |
2328 | if (!list_is_last(&link->master_node, &gpd->master_links)) | |
2329 | seq_puts(s, ", "); | |
2330 | } | |
2331 | ||
2332 | list_for_each_entry(pm_data, &gpd->dev_list, list_node) { | |
2333 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); | |
2334 | if (kobj_path == NULL) | |
2335 | continue; | |
2336 | ||
2337 | seq_printf(s, "\n %-50s ", kobj_path); | |
2338 | rtpm_status_str(s, pm_data->dev); | |
2339 | kfree(kobj_path); | |
2340 | } | |
2341 | ||
2342 | seq_puts(s, "\n"); | |
2343 | exit: | |
2344 | mutex_unlock(&gpd->lock); | |
2345 | ||
2346 | return 0; | |
2347 | } | |
2348 | ||
2349 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2350 | { | |
2351 | struct generic_pm_domain *gpd; | |
2352 | int ret = 0; | |
2353 | ||
2354 | seq_puts(s, " domain status slaves\n"); | |
2355 | seq_puts(s, " /device runtime status\n"); | |
2356 | seq_puts(s, "----------------------------------------------------------------------\n"); | |
2357 | ||
2358 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2359 | if (ret) | |
2360 | return -ERESTARTSYS; | |
2361 | ||
2362 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2363 | ret = pm_genpd_summary_one(s, gpd); | |
2364 | if (ret) | |
2365 | break; | |
2366 | } | |
2367 | mutex_unlock(&gpd_list_lock); | |
2368 | ||
2369 | return ret; | |
2370 | } | |
2371 | ||
2372 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2373 | { | |
2374 | return single_open(file, pm_genpd_summary_show, NULL); | |
2375 | } | |
2376 | ||
2377 | static const struct file_operations pm_genpd_summary_fops = { | |
2378 | .open = pm_genpd_summary_open, | |
2379 | .read = seq_read, | |
2380 | .llseek = seq_lseek, | |
2381 | .release = single_release, | |
2382 | }; | |
2383 | ||
2384 | static int __init pm_genpd_debug_init(void) | |
2385 | { | |
2386 | struct dentry *d; | |
2387 | ||
2388 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2389 | ||
2390 | if (!pm_genpd_debugfs_dir) | |
2391 | return -ENOMEM; | |
2392 | ||
2393 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2394 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2395 | if (!d) | |
2396 | return -ENOMEM; | |
2397 | ||
2398 | return 0; | |
2399 | } | |
2400 | late_initcall(pm_genpd_debug_init); | |
2401 | ||
2402 | static void __exit pm_genpd_debug_exit(void) | |
2403 | { | |
2404 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2405 | } | |
2406 | __exitcall(pm_genpd_debug_exit); | |
2407 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |