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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 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
f721889f RW |
13 | #include <linux/pm_runtime.h> |
14 | #include <linux/pm_domain.h> | |
6ff7bb0d | 15 | #include <linux/pm_qos.h> |
c11f6f5b | 16 | #include <linux/pm_clock.h> |
f721889f RW |
17 | #include <linux/slab.h> |
18 | #include <linux/err.h> | |
17b75eca RW |
19 | #include <linux/sched.h> |
20 | #include <linux/suspend.h> | |
d5e4cbfe RW |
21 | #include <linux/export.h> |
22 | ||
aa8e54b5 TV |
23 | #include "power.h" |
24 | ||
93af5e93 GU |
25 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
26 | ||
d5e4cbfe RW |
27 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
28 | ({ \ | |
29 | type (*__routine)(struct device *__d); \ | |
30 | type __ret = (type)0; \ | |
31 | \ | |
32 | __routine = genpd->dev_ops.callback; \ | |
33 | if (__routine) { \ | |
34 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
35 | } \ |
36 | __ret; \ | |
37 | }) | |
f721889f | 38 | |
5125bbf3 RW |
39 | static LIST_HEAD(gpd_list); |
40 | static DEFINE_MUTEX(gpd_list_lock); | |
41 | ||
35241d12 LI |
42 | struct genpd_lock_ops { |
43 | void (*lock)(struct generic_pm_domain *genpd); | |
44 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
45 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
46 | void (*unlock)(struct generic_pm_domain *genpd); | |
47 | }; | |
48 | ||
49 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
50 | { | |
51 | mutex_lock(&genpd->mlock); | |
52 | } | |
53 | ||
54 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
55 | int depth) | |
56 | { | |
57 | mutex_lock_nested(&genpd->mlock, depth); | |
58 | } | |
59 | ||
60 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
61 | { | |
62 | return mutex_lock_interruptible(&genpd->mlock); | |
63 | } | |
64 | ||
65 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
66 | { | |
67 | return mutex_unlock(&genpd->mlock); | |
68 | } | |
69 | ||
70 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
71 | .lock = genpd_lock_mtx, | |
72 | .lock_nested = genpd_lock_nested_mtx, | |
73 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
74 | .unlock = genpd_unlock_mtx, | |
75 | }; | |
76 | ||
d716f479 LI |
77 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
78 | __acquires(&genpd->slock) | |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | spin_lock_irqsave(&genpd->slock, flags); | |
83 | genpd->lock_flags = flags; | |
84 | } | |
85 | ||
86 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
87 | int depth) | |
88 | __acquires(&genpd->slock) | |
89 | { | |
90 | unsigned long flags; | |
91 | ||
92 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
93 | genpd->lock_flags = flags; | |
94 | } | |
95 | ||
96 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
97 | __acquires(&genpd->slock) | |
98 | { | |
99 | unsigned long flags; | |
100 | ||
101 | spin_lock_irqsave(&genpd->slock, flags); | |
102 | genpd->lock_flags = flags; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
107 | __releases(&genpd->slock) | |
108 | { | |
109 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
110 | } | |
111 | ||
112 | static const struct genpd_lock_ops genpd_spin_ops = { | |
113 | .lock = genpd_lock_spin, | |
114 | .lock_nested = genpd_lock_nested_spin, | |
115 | .lock_interruptible = genpd_lock_interruptible_spin, | |
116 | .unlock = genpd_unlock_spin, | |
117 | }; | |
118 | ||
35241d12 LI |
119 | #define genpd_lock(p) p->lock_ops->lock(p) |
120 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
121 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
122 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
123 | ||
41e2c8e0 | 124 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 125 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 126 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
d716f479 LI |
127 | |
128 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 129 | const struct generic_pm_domain *genpd) |
d716f479 LI |
130 | { |
131 | bool ret; | |
132 | ||
133 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
134 | ||
075c37d5 UH |
135 | /* |
136 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
137 | * to indicate a suboptimal configuration for PM. For an always on | |
138 | * domain this isn't case, thus don't warn. | |
139 | */ | |
140 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
141 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
142 | genpd->name); | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
446d999c RK |
147 | /* |
148 | * Get the generic PM domain for a particular struct device. | |
149 | * This validates the struct device pointer, the PM domain pointer, | |
150 | * and checks that the PM domain pointer is a real generic PM domain. | |
151 | * Any failure results in NULL being returned. | |
152 | */ | |
f58d4e5a | 153 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
154 | { |
155 | struct generic_pm_domain *genpd = NULL, *gpd; | |
156 | ||
157 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
158 | return NULL; | |
159 | ||
160 | mutex_lock(&gpd_list_lock); | |
161 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
162 | if (&gpd->domain == dev->pm_domain) { | |
163 | genpd = gpd; | |
164 | break; | |
165 | } | |
166 | } | |
167 | mutex_unlock(&gpd_list_lock); | |
168 | ||
169 | return genpd; | |
170 | } | |
171 | ||
172 | /* | |
173 | * This should only be used where we are certain that the pm_domain | |
174 | * attached to the device is a genpd domain. | |
175 | */ | |
176 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
177 | { |
178 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
179 | return ERR_PTR(-EINVAL); | |
180 | ||
596ba34b | 181 | return pd_to_genpd(dev->pm_domain); |
5248051b | 182 | } |
f721889f | 183 | |
d8600c8b KK |
184 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
185 | struct device *dev) | |
d5e4cbfe | 186 | { |
2b1d88cd | 187 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
188 | } |
189 | ||
d8600c8b KK |
190 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
191 | struct device *dev) | |
d5e4cbfe | 192 | { |
2b1d88cd | 193 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
194 | } |
195 | ||
c4bb3160 | 196 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 197 | { |
c4bb3160 RW |
198 | bool ret = false; |
199 | ||
200 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
201 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
202 | ||
203 | return ret; | |
204 | } | |
205 | ||
206 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
207 | { | |
208 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 209 | smp_mb__after_atomic(); |
f721889f RW |
210 | } |
211 | ||
afece3ab TG |
212 | #ifdef CONFIG_DEBUG_FS |
213 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
214 | { | |
215 | ktime_t delta, now; | |
216 | ||
217 | now = ktime_get(); | |
218 | delta = ktime_sub(now, genpd->accounting_time); | |
219 | ||
220 | /* | |
221 | * If genpd->status is active, it means we are just | |
222 | * out of off and so update the idle time and vice | |
223 | * versa. | |
224 | */ | |
225 | if (genpd->status == GPD_STATE_ACTIVE) { | |
226 | int state_idx = genpd->state_idx; | |
227 | ||
228 | genpd->states[state_idx].idle_time = | |
229 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
230 | } else { | |
231 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
232 | } | |
233 | ||
234 | genpd->accounting_time = now; | |
235 | } | |
236 | #else | |
237 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
238 | #endif | |
239 | ||
86e12eac | 240 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 241 | { |
fc5cbf0c | 242 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
243 | ktime_t time_start; |
244 | s64 elapsed_ns; | |
245 | int ret; | |
246 | ||
247 | if (!genpd->power_on) | |
248 | return 0; | |
249 | ||
a4630c61 GU |
250 | if (!timed) |
251 | return genpd->power_on(genpd); | |
252 | ||
c8f0ea45 GU |
253 | time_start = ktime_get(); |
254 | ret = genpd->power_on(genpd); | |
255 | if (ret) | |
256 | return ret; | |
257 | ||
258 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 259 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
260 | return ret; |
261 | ||
fc5cbf0c | 262 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 263 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
264 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
265 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
266 | |
267 | return ret; | |
268 | } | |
269 | ||
86e12eac | 270 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 271 | { |
fc5cbf0c | 272 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
273 | ktime_t time_start; |
274 | s64 elapsed_ns; | |
275 | int ret; | |
276 | ||
277 | if (!genpd->power_off) | |
278 | return 0; | |
279 | ||
a4630c61 GU |
280 | if (!timed) |
281 | return genpd->power_off(genpd); | |
282 | ||
c8f0ea45 GU |
283 | time_start = ktime_get(); |
284 | ret = genpd->power_off(genpd); | |
285 | if (ret == -EBUSY) | |
286 | return ret; | |
287 | ||
288 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 289 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
290 | return ret; |
291 | ||
fc5cbf0c | 292 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 293 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
294 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
295 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
296 | |
297 | return ret; | |
298 | } | |
299 | ||
29e47e21 | 300 | /** |
86e12eac | 301 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 302 | * @genpd: PM domain to power off. |
29e47e21 | 303 | * |
86e12eac | 304 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
305 | * before. |
306 | */ | |
307 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
308 | { | |
309 | queue_work(pm_wq, &genpd->power_off_work); | |
310 | } | |
311 | ||
1f8728b7 UH |
312 | /** |
313 | * genpd_power_off - Remove power from a given PM domain. | |
314 | * @genpd: PM domain to power down. | |
3c64649d UH |
315 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
316 | * RPM status of the releated device is in an intermediate state, not yet turned | |
317 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
318 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
319 | * |
320 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
321 | * have been powered down, remove power from @genpd. | |
322 | */ | |
2da83545 UH |
323 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
324 | unsigned int depth) | |
1f8728b7 UH |
325 | { |
326 | struct pm_domain_data *pdd; | |
327 | struct gpd_link *link; | |
328 | unsigned int not_suspended = 0; | |
329 | ||
330 | /* | |
331 | * Do not try to power off the domain in the following situations: | |
332 | * (1) The domain is already in the "power off" state. | |
333 | * (2) System suspend is in progress. | |
334 | */ | |
41e2c8e0 | 335 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
336 | return 0; |
337 | ||
ffaa42e8 UH |
338 | /* |
339 | * Abort power off for the PM domain in the following situations: | |
340 | * (1) The domain is configured as always on. | |
341 | * (2) When the domain has a subdomain being powered on. | |
342 | */ | |
343 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
344 | return -EBUSY; |
345 | ||
346 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
347 | enum pm_qos_flags_status stat; | |
348 | ||
349 | stat = dev_pm_qos_flags(pdd->dev, | |
350 | PM_QOS_FLAG_NO_POWER_OFF | |
351 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
352 | if (stat > PM_QOS_FLAGS_NONE) | |
353 | return -EBUSY; | |
354 | ||
355 | /* | |
356 | * Do not allow PM domain to be powered off, when an IRQ safe | |
357 | * device is part of a non-IRQ safe domain. | |
358 | */ | |
359 | if (!pm_runtime_suspended(pdd->dev) || | |
360 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
361 | not_suspended++; | |
362 | } | |
363 | ||
3c64649d | 364 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
365 | return -EBUSY; |
366 | ||
367 | if (genpd->gov && genpd->gov->power_down_ok) { | |
368 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
369 | return -EAGAIN; | |
370 | } | |
371 | ||
372 | if (genpd->power_off) { | |
373 | int ret; | |
374 | ||
375 | if (atomic_read(&genpd->sd_count) > 0) | |
376 | return -EBUSY; | |
377 | ||
378 | /* | |
379 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
380 | * managed to call genpd_power_on() for the master yet after | |
381 | * incrementing it. In that case genpd_power_on() will wait | |
382 | * for us to drop the lock, so we can call .power_off() and let | |
383 | * the genpd_power_on() restore power for us (this shouldn't | |
384 | * happen very often). | |
385 | */ | |
386 | ret = _genpd_power_off(genpd, true); | |
387 | if (ret) | |
388 | return ret; | |
389 | } | |
390 | ||
391 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 392 | genpd_update_accounting(genpd); |
1f8728b7 UH |
393 | |
394 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
395 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
396 | genpd_lock_nested(link->master, depth + 1); |
397 | genpd_power_off(link->master, false, depth + 1); | |
398 | genpd_unlock(link->master); | |
1f8728b7 UH |
399 | } |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
5248051b | 404 | /** |
86e12eac | 405 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 406 | * @genpd: PM domain to power up. |
0106ef51 | 407 | * @depth: nesting count for lockdep. |
5248051b | 408 | * |
5063ce15 | 409 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
410 | * resume a device belonging to it. |
411 | */ | |
86e12eac | 412 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 413 | { |
5063ce15 | 414 | struct gpd_link *link; |
5248051b RW |
415 | int ret = 0; |
416 | ||
41e2c8e0 | 417 | if (genpd_status_on(genpd)) |
3f241775 | 418 | return 0; |
5248051b | 419 | |
5063ce15 RW |
420 | /* |
421 | * The list is guaranteed not to change while the loop below is being | |
422 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
423 | * with it. | |
424 | */ | |
425 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
426 | struct generic_pm_domain *master = link->master; |
427 | ||
428 | genpd_sd_counter_inc(master); | |
429 | ||
35241d12 | 430 | genpd_lock_nested(master, depth + 1); |
86e12eac | 431 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 432 | genpd_unlock(master); |
5248051b | 433 | |
5063ce15 | 434 | if (ret) { |
0106ef51 | 435 | genpd_sd_counter_dec(master); |
9e08cf42 | 436 | goto err; |
5063ce15 | 437 | } |
5248051b RW |
438 | } |
439 | ||
86e12eac | 440 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
441 | if (ret) |
442 | goto err; | |
5248051b | 443 | |
ba2bbfbf | 444 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
445 | genpd_update_accounting(genpd); |
446 | ||
3f241775 | 447 | return 0; |
9e08cf42 RW |
448 | |
449 | err: | |
29e47e21 UH |
450 | list_for_each_entry_continue_reverse(link, |
451 | &genpd->slave_links, | |
452 | slave_node) { | |
5063ce15 | 453 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
454 | genpd_lock_nested(link->master, depth + 1); |
455 | genpd_power_off(link->master, false, depth + 1); | |
456 | genpd_unlock(link->master); | |
29e47e21 | 457 | } |
9e08cf42 | 458 | |
3f241775 RW |
459 | return ret; |
460 | } | |
461 | ||
6ff7bb0d RW |
462 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
463 | unsigned long val, void *ptr) | |
464 | { | |
465 | struct generic_pm_domain_data *gpd_data; | |
466 | struct device *dev; | |
467 | ||
468 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 469 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
470 | |
471 | for (;;) { | |
472 | struct generic_pm_domain *genpd; | |
473 | struct pm_domain_data *pdd; | |
474 | ||
475 | spin_lock_irq(&dev->power.lock); | |
476 | ||
477 | pdd = dev->power.subsys_data ? | |
478 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 479 | if (pdd) { |
6ff7bb0d RW |
480 | to_gpd_data(pdd)->td.constraint_changed = true; |
481 | genpd = dev_to_genpd(dev); | |
482 | } else { | |
483 | genpd = ERR_PTR(-ENODATA); | |
484 | } | |
485 | ||
486 | spin_unlock_irq(&dev->power.lock); | |
487 | ||
488 | if (!IS_ERR(genpd)) { | |
35241d12 | 489 | genpd_lock(genpd); |
6ff7bb0d | 490 | genpd->max_off_time_changed = true; |
35241d12 | 491 | genpd_unlock(genpd); |
6ff7bb0d RW |
492 | } |
493 | ||
494 | dev = dev->parent; | |
495 | if (!dev || dev->power.ignore_children) | |
496 | break; | |
497 | } | |
498 | ||
499 | return NOTIFY_DONE; | |
500 | } | |
501 | ||
f721889f RW |
502 | /** |
503 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
504 | * @work: Work structure used for scheduling the execution of this function. | |
505 | */ | |
506 | static void genpd_power_off_work_fn(struct work_struct *work) | |
507 | { | |
508 | struct generic_pm_domain *genpd; | |
509 | ||
510 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
511 | ||
35241d12 | 512 | genpd_lock(genpd); |
2da83545 | 513 | genpd_power_off(genpd, false, 0); |
35241d12 | 514 | genpd_unlock(genpd); |
f721889f RW |
515 | } |
516 | ||
54eeddbf UH |
517 | /** |
518 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
519 | * @dev: Device to handle. | |
520 | */ | |
521 | static int __genpd_runtime_suspend(struct device *dev) | |
522 | { | |
523 | int (*cb)(struct device *__dev); | |
524 | ||
525 | if (dev->type && dev->type->pm) | |
526 | cb = dev->type->pm->runtime_suspend; | |
527 | else if (dev->class && dev->class->pm) | |
528 | cb = dev->class->pm->runtime_suspend; | |
529 | else if (dev->bus && dev->bus->pm) | |
530 | cb = dev->bus->pm->runtime_suspend; | |
531 | else | |
532 | cb = NULL; | |
533 | ||
534 | if (!cb && dev->driver && dev->driver->pm) | |
535 | cb = dev->driver->pm->runtime_suspend; | |
536 | ||
537 | return cb ? cb(dev) : 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
542 | * @dev: Device to handle. | |
543 | */ | |
544 | static int __genpd_runtime_resume(struct device *dev) | |
545 | { | |
546 | int (*cb)(struct device *__dev); | |
547 | ||
548 | if (dev->type && dev->type->pm) | |
549 | cb = dev->type->pm->runtime_resume; | |
550 | else if (dev->class && dev->class->pm) | |
551 | cb = dev->class->pm->runtime_resume; | |
552 | else if (dev->bus && dev->bus->pm) | |
553 | cb = dev->bus->pm->runtime_resume; | |
554 | else | |
555 | cb = NULL; | |
556 | ||
557 | if (!cb && dev->driver && dev->driver->pm) | |
558 | cb = dev->driver->pm->runtime_resume; | |
559 | ||
560 | return cb ? cb(dev) : 0; | |
561 | } | |
562 | ||
f721889f | 563 | /** |
795bd2e7 | 564 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
565 | * @dev: Device to suspend. |
566 | * | |
567 | * Carry out a runtime suspend of a device under the assumption that its | |
568 | * pm_domain field points to the domain member of an object of type | |
569 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
570 | */ | |
795bd2e7 | 571 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
572 | { |
573 | struct generic_pm_domain *genpd; | |
9df3921e | 574 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 575 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 576 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
577 | ktime_t time_start; |
578 | s64 elapsed_ns; | |
d5e4cbfe | 579 | int ret; |
f721889f RW |
580 | |
581 | dev_dbg(dev, "%s()\n", __func__); | |
582 | ||
5248051b RW |
583 | genpd = dev_to_genpd(dev); |
584 | if (IS_ERR(genpd)) | |
f721889f RW |
585 | return -EINVAL; |
586 | ||
ffe12855 UH |
587 | /* |
588 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
589 | * callbacks for other purposes than runtime PM. In those scenarios | |
590 | * runtime PM is disabled. Under these circumstances, we shall skip | |
591 | * validating/measuring the PM QoS latency. | |
592 | */ | |
9df3921e UH |
593 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
594 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
595 | return -EBUSY; |
596 | ||
2b1d88cd | 597 | /* Measure suspend latency. */ |
d33d5a6c | 598 | time_start = 0; |
ffe12855 UH |
599 | if (runtime_pm) |
600 | time_start = ktime_get(); | |
2b1d88cd | 601 | |
54eeddbf | 602 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
603 | if (ret) |
604 | return ret; | |
17b75eca | 605 | |
2b1d88cd | 606 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 607 | if (ret) { |
54eeddbf | 608 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
609 | return ret; |
610 | } | |
611 | ||
2b1d88cd | 612 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
613 | if (runtime_pm) { |
614 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
615 | if (elapsed_ns > td->suspend_latency_ns) { | |
616 | td->suspend_latency_ns = elapsed_ns; | |
617 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
618 | elapsed_ns); | |
619 | genpd->max_off_time_changed = true; | |
620 | td->constraint_changed = true; | |
621 | } | |
2b1d88cd UH |
622 | } |
623 | ||
0aa2a221 | 624 | /* |
d716f479 LI |
625 | * If power.irq_safe is set, this routine may be run with |
626 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 627 | */ |
d716f479 | 628 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
629 | return 0; |
630 | ||
35241d12 | 631 | genpd_lock(genpd); |
2da83545 | 632 | genpd_power_off(genpd, true, 0); |
35241d12 | 633 | genpd_unlock(genpd); |
f721889f RW |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
f721889f | 638 | /** |
795bd2e7 | 639 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
640 | * @dev: Device to resume. |
641 | * | |
642 | * Carry out a runtime resume of a device under the assumption that its | |
643 | * pm_domain field points to the domain member of an object of type | |
644 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
645 | */ | |
795bd2e7 | 646 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
647 | { |
648 | struct generic_pm_domain *genpd; | |
2b1d88cd | 649 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 650 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
651 | ktime_t time_start; |
652 | s64 elapsed_ns; | |
f721889f | 653 | int ret; |
ba2bbfbf | 654 | bool timed = true; |
f721889f RW |
655 | |
656 | dev_dbg(dev, "%s()\n", __func__); | |
657 | ||
5248051b RW |
658 | genpd = dev_to_genpd(dev); |
659 | if (IS_ERR(genpd)) | |
f721889f RW |
660 | return -EINVAL; |
661 | ||
d716f479 LI |
662 | /* |
663 | * As we don't power off a non IRQ safe domain, which holds | |
664 | * an IRQ safe device, we don't need to restore power to it. | |
665 | */ | |
666 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
667 | timed = false; |
668 | goto out; | |
669 | } | |
0aa2a221 | 670 | |
35241d12 | 671 | genpd_lock(genpd); |
86e12eac | 672 | ret = genpd_power_on(genpd, 0); |
35241d12 | 673 | genpd_unlock(genpd); |
c6d22b37 | 674 | |
ba2bbfbf UH |
675 | if (ret) |
676 | return ret; | |
c6d22b37 | 677 | |
ba2bbfbf | 678 | out: |
2b1d88cd | 679 | /* Measure resume latency. */ |
ab51e6ba | 680 | time_start = 0; |
ffe12855 | 681 | if (timed && runtime_pm) |
2b1d88cd UH |
682 | time_start = ktime_get(); |
683 | ||
076395ca LP |
684 | ret = genpd_start_dev(genpd, dev); |
685 | if (ret) | |
686 | goto err_poweroff; | |
687 | ||
54eeddbf | 688 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
689 | if (ret) |
690 | goto err_stop; | |
2b1d88cd UH |
691 | |
692 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 693 | if (timed && runtime_pm) { |
2b1d88cd UH |
694 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
695 | if (elapsed_ns > td->resume_latency_ns) { | |
696 | td->resume_latency_ns = elapsed_ns; | |
697 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
698 | elapsed_ns); | |
699 | genpd->max_off_time_changed = true; | |
700 | td->constraint_changed = true; | |
701 | } | |
702 | } | |
17b75eca | 703 | |
f721889f | 704 | return 0; |
076395ca LP |
705 | |
706 | err_stop: | |
707 | genpd_stop_dev(genpd, dev); | |
708 | err_poweroff: | |
d716f479 LI |
709 | if (!pm_runtime_is_irq_safe(dev) || |
710 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 711 | genpd_lock(genpd); |
2da83545 | 712 | genpd_power_off(genpd, true, 0); |
35241d12 | 713 | genpd_unlock(genpd); |
076395ca LP |
714 | } |
715 | ||
716 | return ret; | |
f721889f RW |
717 | } |
718 | ||
39ac5ba5 TB |
719 | static bool pd_ignore_unused; |
720 | static int __init pd_ignore_unused_setup(char *__unused) | |
721 | { | |
722 | pd_ignore_unused = true; | |
723 | return 1; | |
724 | } | |
725 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
726 | ||
17f2ae7f | 727 | /** |
86e12eac | 728 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 729 | */ |
86e12eac | 730 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
731 | { |
732 | struct generic_pm_domain *genpd; | |
733 | ||
39ac5ba5 TB |
734 | if (pd_ignore_unused) { |
735 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 736 | return 0; |
39ac5ba5 TB |
737 | } |
738 | ||
17f2ae7f RW |
739 | mutex_lock(&gpd_list_lock); |
740 | ||
741 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
742 | genpd_queue_power_off_work(genpd); | |
743 | ||
744 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 745 | |
2fe71dcd UH |
746 | return 0; |
747 | } | |
86e12eac | 748 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 749 | |
0159ec67 | 750 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 751 | |
77f827de RW |
752 | /** |
753 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
754 | * @genpd: PM domain to check. | |
755 | */ | |
895b31f3 | 756 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 757 | { |
895b31f3 | 758 | const struct generic_pm_domain *gpd; |
77f827de RW |
759 | |
760 | if (IS_ERR_OR_NULL(genpd)) | |
761 | return false; | |
762 | ||
763 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
764 | if (gpd == genpd) | |
765 | return true; | |
766 | ||
767 | return false; | |
768 | } | |
769 | ||
0159ec67 JH |
770 | #endif |
771 | ||
772 | #ifdef CONFIG_PM_SLEEP | |
773 | ||
d8600c8b | 774 | static bool genpd_dev_active_wakeup(const struct generic_pm_domain *genpd, |
d5e4cbfe RW |
775 | struct device *dev) |
776 | { | |
777 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
778 | } | |
779 | ||
596ba34b | 780 | /** |
86e12eac | 781 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 782 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
783 | * @use_lock: use the lock. |
784 | * @depth: nesting count for lockdep. | |
596ba34b RW |
785 | * |
786 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 787 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 788 | * |
77f827de | 789 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
790 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
791 | * these cases the lock must be held. | |
596ba34b | 792 | */ |
0883ac03 UH |
793 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
794 | unsigned int depth) | |
596ba34b | 795 | { |
5063ce15 | 796 | struct gpd_link *link; |
596ba34b | 797 | |
ffaa42e8 | 798 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
799 | return; |
800 | ||
c4bb3160 RW |
801 | if (genpd->suspended_count != genpd->device_count |
802 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
803 | return; |
804 | ||
fc5cbf0c AH |
805 | /* Choose the deepest state when suspending */ |
806 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
807 | if (_genpd_power_off(genpd, false)) |
808 | return; | |
596ba34b | 809 | |
17b75eca | 810 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
811 | |
812 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
813 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
814 | |
815 | if (use_lock) | |
816 | genpd_lock_nested(link->master, depth + 1); | |
817 | ||
818 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
819 | ||
820 | if (use_lock) | |
821 | genpd_unlock(link->master); | |
596ba34b RW |
822 | } |
823 | } | |
824 | ||
802d8b49 | 825 | /** |
86e12eac | 826 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 827 | * @genpd: PM domain to power on. |
0883ac03 UH |
828 | * @use_lock: use the lock. |
829 | * @depth: nesting count for lockdep. | |
802d8b49 | 830 | * |
77f827de | 831 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
832 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
833 | * these cases the lock must be held. | |
802d8b49 | 834 | */ |
0883ac03 UH |
835 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
836 | unsigned int depth) | |
802d8b49 RW |
837 | { |
838 | struct gpd_link *link; | |
839 | ||
41e2c8e0 | 840 | if (genpd_status_on(genpd)) |
802d8b49 RW |
841 | return; |
842 | ||
843 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 844 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
845 | |
846 | if (use_lock) | |
847 | genpd_lock_nested(link->master, depth + 1); | |
848 | ||
849 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
850 | ||
851 | if (use_lock) | |
852 | genpd_unlock(link->master); | |
802d8b49 RW |
853 | } |
854 | ||
86e12eac | 855 | _genpd_power_on(genpd, false); |
802d8b49 RW |
856 | |
857 | genpd->status = GPD_STATE_ACTIVE; | |
858 | } | |
859 | ||
4ecd6e65 RW |
860 | /** |
861 | * resume_needed - Check whether to resume a device before system suspend. | |
862 | * @dev: Device to check. | |
863 | * @genpd: PM domain the device belongs to. | |
864 | * | |
865 | * There are two cases in which a device that can wake up the system from sleep | |
866 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
867 | * to wake up the system and it has to remain active for this purpose while the | |
868 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
869 | * the system from sleep states and it generally doesn't generate wakeup signals | |
870 | * by itself (those signals are generated on its behalf by other parts of the | |
871 | * system). In the latter case it may be necessary to reconfigure the device's | |
872 | * wakeup settings during system suspend, because it may have been set up to | |
873 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
874 | * Return 'true' in either of the above cases. | |
875 | */ | |
d8600c8b KK |
876 | static bool resume_needed(struct device *dev, |
877 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
878 | { |
879 | bool active_wakeup; | |
880 | ||
881 | if (!device_can_wakeup(dev)) | |
882 | return false; | |
883 | ||
d5e4cbfe | 884 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
885 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
886 | } | |
887 | ||
596ba34b RW |
888 | /** |
889 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
890 | * @dev: Device to start the transition of. | |
891 | * | |
892 | * Start a power transition of a device (during a system-wide power transition) | |
893 | * under the assumption that its pm_domain field points to the domain member of | |
894 | * an object of type struct generic_pm_domain representing a PM domain | |
895 | * consisting of I/O devices. | |
896 | */ | |
897 | static int pm_genpd_prepare(struct device *dev) | |
898 | { | |
899 | struct generic_pm_domain *genpd; | |
b6c10c84 | 900 | int ret; |
596ba34b RW |
901 | |
902 | dev_dbg(dev, "%s()\n", __func__); | |
903 | ||
904 | genpd = dev_to_genpd(dev); | |
905 | if (IS_ERR(genpd)) | |
906 | return -EINVAL; | |
907 | ||
17b75eca RW |
908 | /* |
909 | * If a wakeup request is pending for the device, it should be woken up | |
910 | * at this point and a system wakeup event should be reported if it's | |
911 | * set up to wake up the system from sleep states. | |
912 | */ | |
4ecd6e65 RW |
913 | if (resume_needed(dev, genpd)) |
914 | pm_runtime_resume(dev); | |
915 | ||
35241d12 | 916 | genpd_lock(genpd); |
596ba34b | 917 | |
39dd0f23 | 918 | if (genpd->prepared_count++ == 0) |
65533bbf | 919 | genpd->suspended_count = 0; |
17b75eca | 920 | |
35241d12 | 921 | genpd_unlock(genpd); |
596ba34b | 922 | |
b6c10c84 RW |
923 | ret = pm_generic_prepare(dev); |
924 | if (ret) { | |
35241d12 | 925 | genpd_lock(genpd); |
b6c10c84 | 926 | |
39dd0f23 | 927 | genpd->prepared_count--; |
b6c10c84 | 928 | |
35241d12 | 929 | genpd_unlock(genpd); |
b6c10c84 | 930 | } |
17b75eca | 931 | |
b6c10c84 | 932 | return ret; |
596ba34b RW |
933 | } |
934 | ||
0496c8ae | 935 | /** |
10da6542 MP |
936 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
937 | * I/O pm domain. | |
0496c8ae | 938 | * @dev: Device to suspend. |
10da6542 | 939 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
940 | * |
941 | * Stop the device and remove power from the domain if all devices in it have | |
942 | * been stopped. | |
943 | */ | |
10da6542 | 944 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
945 | { |
946 | struct generic_pm_domain *genpd; | |
122a2237 | 947 | int ret; |
0496c8ae | 948 | |
0496c8ae RW |
949 | genpd = dev_to_genpd(dev); |
950 | if (IS_ERR(genpd)) | |
951 | return -EINVAL; | |
596ba34b | 952 | |
39dd0f23 | 953 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
954 | return 0; |
955 | ||
10da6542 MP |
956 | if (poweroff) |
957 | ret = pm_generic_poweroff_noirq(dev); | |
958 | else | |
959 | ret = pm_generic_suspend_noirq(dev); | |
960 | if (ret) | |
961 | return ret; | |
962 | ||
122a2237 UH |
963 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
964 | ret = pm_runtime_force_suspend(dev); | |
965 | if (ret) | |
966 | return ret; | |
967 | } | |
968 | ||
0883ac03 | 969 | genpd_lock(genpd); |
596ba34b | 970 | genpd->suspended_count++; |
0883ac03 UH |
971 | genpd_sync_power_off(genpd, true, 0); |
972 | genpd_unlock(genpd); | |
596ba34b RW |
973 | |
974 | return 0; | |
975 | } | |
976 | ||
10da6542 MP |
977 | /** |
978 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
979 | * @dev: Device to suspend. | |
980 | * | |
981 | * Stop the device and remove power from the domain if all devices in it have | |
982 | * been stopped. | |
983 | */ | |
984 | static int pm_genpd_suspend_noirq(struct device *dev) | |
985 | { | |
986 | dev_dbg(dev, "%s()\n", __func__); | |
987 | ||
988 | return genpd_finish_suspend(dev, false); | |
989 | } | |
990 | ||
596ba34b | 991 | /** |
0496c8ae | 992 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
993 | * @dev: Device to resume. |
994 | * | |
0496c8ae | 995 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
996 | */ |
997 | static int pm_genpd_resume_noirq(struct device *dev) | |
998 | { | |
999 | struct generic_pm_domain *genpd; | |
122a2237 | 1000 | int ret = 0; |
596ba34b RW |
1001 | |
1002 | dev_dbg(dev, "%s()\n", __func__); | |
1003 | ||
1004 | genpd = dev_to_genpd(dev); | |
1005 | if (IS_ERR(genpd)) | |
1006 | return -EINVAL; | |
1007 | ||
39dd0f23 | 1008 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
1009 | return 0; |
1010 | ||
0883ac03 UH |
1011 | genpd_lock(genpd); |
1012 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1013 | genpd->suspended_count--; |
0883ac03 | 1014 | genpd_unlock(genpd); |
596ba34b | 1015 | |
122a2237 UH |
1016 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1017 | ret = pm_runtime_force_resume(dev); | |
1018 | ||
10da6542 MP |
1019 | ret = pm_generic_resume_noirq(dev); |
1020 | if (ret) | |
1021 | return ret; | |
1022 | ||
122a2237 | 1023 | return ret; |
596ba34b RW |
1024 | } |
1025 | ||
0496c8ae RW |
1026 | /** |
1027 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
1028 | * @dev: Device to freeze. |
1029 | * | |
1030 | * Carry out a late freeze of a device under the assumption that its | |
1031 | * pm_domain field points to the domain member of an object of type | |
1032 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1033 | * devices. | |
1034 | */ | |
1035 | static int pm_genpd_freeze_noirq(struct device *dev) | |
1036 | { | |
d8600c8b | 1037 | const struct generic_pm_domain *genpd; |
122a2237 | 1038 | int ret = 0; |
596ba34b RW |
1039 | |
1040 | dev_dbg(dev, "%s()\n", __func__); | |
1041 | ||
1042 | genpd = dev_to_genpd(dev); | |
1043 | if (IS_ERR(genpd)) | |
1044 | return -EINVAL; | |
1045 | ||
10da6542 MP |
1046 | ret = pm_generic_freeze_noirq(dev); |
1047 | if (ret) | |
1048 | return ret; | |
1049 | ||
122a2237 UH |
1050 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1051 | ret = pm_runtime_force_suspend(dev); | |
1052 | ||
1053 | return ret; | |
0496c8ae | 1054 | } |
596ba34b | 1055 | |
0496c8ae RW |
1056 | /** |
1057 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1058 | * @dev: Device to thaw. | |
1059 | * | |
1060 | * Start the device, unless power has been removed from the domain already | |
1061 | * before the system transition. | |
1062 | */ | |
1063 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1064 | { | |
d8600c8b | 1065 | const struct generic_pm_domain *genpd; |
122a2237 | 1066 | int ret = 0; |
596ba34b | 1067 | |
0496c8ae | 1068 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1069 | |
0496c8ae RW |
1070 | genpd = dev_to_genpd(dev); |
1071 | if (IS_ERR(genpd)) | |
1072 | return -EINVAL; | |
1073 | ||
10da6542 | 1074 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
122a2237 | 1075 | ret = pm_runtime_force_resume(dev); |
10da6542 MP |
1076 | if (ret) |
1077 | return ret; | |
1078 | } | |
122a2237 | 1079 | |
10da6542 MP |
1080 | return pm_generic_thaw_noirq(dev); |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * pm_genpd_poweroff_noirq - Completion of hibernation of device in an | |
1085 | * I/O PM domain. | |
1086 | * @dev: Device to poweroff. | |
1087 | * | |
1088 | * Stop the device and remove power from the domain if all devices in it have | |
1089 | * been stopped. | |
1090 | */ | |
1091 | static int pm_genpd_poweroff_noirq(struct device *dev) | |
1092 | { | |
1093 | dev_dbg(dev, "%s()\n", __func__); | |
1094 | ||
1095 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1096 | } |
1097 | ||
596ba34b | 1098 | /** |
0496c8ae | 1099 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1100 | * @dev: Device to resume. |
1101 | * | |
0496c8ae RW |
1102 | * Make sure the domain will be in the same power state as before the |
1103 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1104 | */ |
1105 | static int pm_genpd_restore_noirq(struct device *dev) | |
1106 | { | |
1107 | struct generic_pm_domain *genpd; | |
122a2237 | 1108 | int ret = 0; |
596ba34b RW |
1109 | |
1110 | dev_dbg(dev, "%s()\n", __func__); | |
1111 | ||
1112 | genpd = dev_to_genpd(dev); | |
1113 | if (IS_ERR(genpd)) | |
1114 | return -EINVAL; | |
1115 | ||
1116 | /* | |
65533bbf RW |
1117 | * At this point suspended_count == 0 means we are being run for the |
1118 | * first time for the given domain in the present cycle. | |
596ba34b | 1119 | */ |
0883ac03 | 1120 | genpd_lock(genpd); |
39dd0f23 | 1121 | if (genpd->suspended_count++ == 0) |
596ba34b | 1122 | /* |
65533bbf | 1123 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1124 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1125 | * so that it tries to power it on in case it was really off. |
596ba34b | 1126 | */ |
65533bbf | 1127 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1128 | |
0883ac03 UH |
1129 | genpd_sync_power_on(genpd, true, 0); |
1130 | genpd_unlock(genpd); | |
596ba34b | 1131 | |
10da6542 | 1132 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
122a2237 | 1133 | ret = pm_runtime_force_resume(dev); |
10da6542 MP |
1134 | if (ret) |
1135 | return ret; | |
1136 | } | |
122a2237 | 1137 | |
10da6542 | 1138 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1139 | } |
1140 | ||
1141 | /** | |
1142 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1143 | * @dev: Device to complete the transition of. | |
1144 | * | |
1145 | * Complete a power transition of a device (during a system-wide power | |
1146 | * transition) under the assumption that its pm_domain field points to the | |
1147 | * domain member of an object of type struct generic_pm_domain representing | |
1148 | * a power domain consisting of I/O devices. | |
1149 | */ | |
1150 | static void pm_genpd_complete(struct device *dev) | |
1151 | { | |
1152 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1153 | |
1154 | dev_dbg(dev, "%s()\n", __func__); | |
1155 | ||
1156 | genpd = dev_to_genpd(dev); | |
1157 | if (IS_ERR(genpd)) | |
1158 | return; | |
1159 | ||
4d23a5e8 UH |
1160 | pm_generic_complete(dev); |
1161 | ||
35241d12 | 1162 | genpd_lock(genpd); |
596ba34b | 1163 | |
39dd0f23 | 1164 | genpd->prepared_count--; |
4d23a5e8 UH |
1165 | if (!genpd->prepared_count) |
1166 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1167 | |
35241d12 | 1168 | genpd_unlock(genpd); |
596ba34b RW |
1169 | } |
1170 | ||
77f827de | 1171 | /** |
d47e6464 | 1172 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1173 | * @dev: Device that normally is marked as "always on" to switch power for. |
1174 | * | |
1175 | * This routine may only be called during the system core (syscore) suspend or | |
1176 | * resume phase for devices whose "always on" flags are set. | |
1177 | */ | |
d47e6464 | 1178 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1179 | { |
1180 | struct generic_pm_domain *genpd; | |
1181 | ||
23c6d2c7 RW |
1182 | genpd = dev_to_genpd(dev); |
1183 | if (!pm_genpd_present(genpd)) | |
77f827de RW |
1184 | return; |
1185 | ||
1186 | if (suspend) { | |
1187 | genpd->suspended_count++; | |
0883ac03 | 1188 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1189 | } else { |
0883ac03 | 1190 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1191 | genpd->suspended_count--; |
1192 | } | |
1193 | } | |
d47e6464 UH |
1194 | |
1195 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1196 | { | |
1197 | genpd_syscore_switch(dev, true); | |
1198 | } | |
1199 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1200 | ||
1201 | void pm_genpd_syscore_poweron(struct device *dev) | |
1202 | { | |
1203 | genpd_syscore_switch(dev, false); | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1206 | |
d30d819d | 1207 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1208 | |
1209 | #define pm_genpd_prepare NULL | |
596ba34b RW |
1210 | #define pm_genpd_suspend_noirq NULL |
1211 | #define pm_genpd_resume_noirq NULL | |
596ba34b RW |
1212 | #define pm_genpd_freeze_noirq NULL |
1213 | #define pm_genpd_thaw_noirq NULL | |
af3eb274 | 1214 | #define pm_genpd_poweroff_noirq NULL |
596ba34b | 1215 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1216 | #define pm_genpd_complete NULL |
1217 | ||
1218 | #endif /* CONFIG_PM_SLEEP */ | |
1219 | ||
f104e1e5 UH |
1220 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1221 | struct generic_pm_domain *genpd, | |
1222 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1223 | { |
1224 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1225 | int ret; |
1226 | ||
1227 | ret = dev_pm_get_subsys_data(dev); | |
1228 | if (ret) | |
1229 | return ERR_PTR(ret); | |
1d5fcfec RW |
1230 | |
1231 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1232 | if (!gpd_data) { |
1233 | ret = -ENOMEM; | |
1234 | goto err_put; | |
1235 | } | |
1d5fcfec | 1236 | |
f104e1e5 UH |
1237 | if (td) |
1238 | gpd_data->td = *td; | |
1239 | ||
1240 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1241 | gpd_data->td.constraint_changed = true; |
1242 | gpd_data->td.effective_constraint_ns = -1; | |
1243 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1244 | ||
1245 | spin_lock_irq(&dev->power.lock); | |
1246 | ||
1247 | if (dev->power.subsys_data->domain_data) { | |
1248 | ret = -EINVAL; | |
1249 | goto err_free; | |
1250 | } | |
1251 | ||
1252 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1253 | |
1254 | spin_unlock_irq(&dev->power.lock); | |
1255 | ||
1d5fcfec | 1256 | return gpd_data; |
3e235685 | 1257 | |
f104e1e5 UH |
1258 | err_free: |
1259 | spin_unlock_irq(&dev->power.lock); | |
1260 | kfree(gpd_data); | |
3e235685 UH |
1261 | err_put: |
1262 | dev_pm_put_subsys_data(dev); | |
1263 | return ERR_PTR(ret); | |
1d5fcfec RW |
1264 | } |
1265 | ||
49d400c7 UH |
1266 | static void genpd_free_dev_data(struct device *dev, |
1267 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1268 | { |
f104e1e5 UH |
1269 | spin_lock_irq(&dev->power.lock); |
1270 | ||
f104e1e5 UH |
1271 | dev->power.subsys_data->domain_data = NULL; |
1272 | ||
1273 | spin_unlock_irq(&dev->power.lock); | |
1274 | ||
1d5fcfec | 1275 | kfree(gpd_data); |
3e235685 | 1276 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1277 | } |
1278 | ||
19efa5ff JH |
1279 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1280 | struct gpd_timing_data *td) | |
f721889f | 1281 | { |
c0356db7 | 1282 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1283 | int ret = 0; |
1284 | ||
1285 | dev_dbg(dev, "%s()\n", __func__); | |
1286 | ||
1287 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1288 | return -EINVAL; | |
1289 | ||
f104e1e5 | 1290 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1291 | if (IS_ERR(gpd_data)) |
1292 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1293 | |
35241d12 | 1294 | genpd_lock(genpd); |
f721889f | 1295 | |
596ba34b RW |
1296 | if (genpd->prepared_count > 0) { |
1297 | ret = -EAGAIN; | |
1298 | goto out; | |
1299 | } | |
1300 | ||
b472c2fa UH |
1301 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1302 | if (ret) | |
1303 | goto out; | |
d79b6fe1 | 1304 | |
975e83cf SH |
1305 | dev_pm_domain_set(dev, &genpd->domain); |
1306 | ||
14b53064 UH |
1307 | genpd->device_count++; |
1308 | genpd->max_off_time_changed = true; | |
1309 | ||
1d5fcfec | 1310 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1311 | |
f721889f | 1312 | out: |
35241d12 | 1313 | genpd_unlock(genpd); |
f721889f | 1314 | |
c0356db7 UH |
1315 | if (ret) |
1316 | genpd_free_dev_data(dev, gpd_data); | |
1317 | else | |
1318 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1319 | |
f721889f RW |
1320 | return ret; |
1321 | } | |
19efa5ff JH |
1322 | |
1323 | /** | |
1324 | * __pm_genpd_add_device - Add a device to an I/O PM domain. | |
1325 | * @genpd: PM domain to add the device to. | |
1326 | * @dev: Device to be added. | |
1327 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1328 | */ | |
1329 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, | |
1330 | struct gpd_timing_data *td) | |
1331 | { | |
1332 | int ret; | |
1333 | ||
1334 | mutex_lock(&gpd_list_lock); | |
1335 | ret = genpd_add_device(genpd, dev, td); | |
1336 | mutex_unlock(&gpd_list_lock); | |
1337 | ||
1338 | return ret; | |
1339 | } | |
24c96dc7 | 1340 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f | 1341 | |
85168d56 UH |
1342 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1343 | struct device *dev) | |
f721889f | 1344 | { |
6ff7bb0d | 1345 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1346 | struct pm_domain_data *pdd; |
efa69025 | 1347 | int ret = 0; |
f721889f RW |
1348 | |
1349 | dev_dbg(dev, "%s()\n", __func__); | |
1350 | ||
c0356db7 UH |
1351 | pdd = dev->power.subsys_data->domain_data; |
1352 | gpd_data = to_gpd_data(pdd); | |
1353 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1354 | ||
35241d12 | 1355 | genpd_lock(genpd); |
f721889f | 1356 | |
596ba34b RW |
1357 | if (genpd->prepared_count > 0) { |
1358 | ret = -EAGAIN; | |
1359 | goto out; | |
1360 | } | |
1361 | ||
6ff7bb0d RW |
1362 | genpd->device_count--; |
1363 | genpd->max_off_time_changed = true; | |
1364 | ||
d79b6fe1 | 1365 | if (genpd->detach_dev) |
c16561e8 | 1366 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1367 | |
975e83cf SH |
1368 | dev_pm_domain_set(dev, NULL); |
1369 | ||
efa69025 | 1370 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1371 | |
35241d12 | 1372 | genpd_unlock(genpd); |
6ff7bb0d | 1373 | |
c1dbe2fb | 1374 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1375 | |
6ff7bb0d | 1376 | return 0; |
f721889f | 1377 | |
596ba34b | 1378 | out: |
35241d12 | 1379 | genpd_unlock(genpd); |
c0356db7 | 1380 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1381 | |
1382 | return ret; | |
1383 | } | |
85168d56 UH |
1384 | |
1385 | /** | |
1386 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1387 | * @genpd: PM domain to remove the device from. | |
1388 | * @dev: Device to be removed. | |
1389 | */ | |
1390 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1391 | struct device *dev) | |
1392 | { | |
1393 | if (!genpd || genpd != genpd_lookup_dev(dev)) | |
1394 | return -EINVAL; | |
1395 | ||
1396 | return genpd_remove_device(genpd, dev); | |
1397 | } | |
24c96dc7 | 1398 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1399 | |
19efa5ff JH |
1400 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1401 | struct generic_pm_domain *subdomain) | |
f721889f | 1402 | { |
2547923d | 1403 | struct gpd_link *link, *itr; |
f721889f RW |
1404 | int ret = 0; |
1405 | ||
fb7268be RW |
1406 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1407 | || genpd == subdomain) | |
f721889f RW |
1408 | return -EINVAL; |
1409 | ||
d716f479 LI |
1410 | /* |
1411 | * If the domain can be powered on/off in an IRQ safe | |
1412 | * context, ensure that the subdomain can also be | |
1413 | * powered on/off in that context. | |
1414 | */ | |
1415 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1416 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1417 | genpd->name, subdomain->name); |
1418 | return -EINVAL; | |
1419 | } | |
1420 | ||
2547923d LI |
1421 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1422 | if (!link) | |
1423 | return -ENOMEM; | |
1424 | ||
35241d12 LI |
1425 | genpd_lock(subdomain); |
1426 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1427 | |
41e2c8e0 | 1428 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1429 | ret = -EINVAL; |
1430 | goto out; | |
1431 | } | |
1432 | ||
2547923d LI |
1433 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1434 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1435 | ret = -EINVAL; |
1436 | goto out; | |
1437 | } | |
1438 | } | |
1439 | ||
5063ce15 RW |
1440 | link->master = genpd; |
1441 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1442 | link->slave = subdomain; |
1443 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1444 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1445 | genpd_sd_counter_inc(genpd); |
f721889f | 1446 | |
f721889f | 1447 | out: |
35241d12 LI |
1448 | genpd_unlock(genpd); |
1449 | genpd_unlock(subdomain); | |
2547923d LI |
1450 | if (ret) |
1451 | kfree(link); | |
f721889f RW |
1452 | return ret; |
1453 | } | |
19efa5ff JH |
1454 | |
1455 | /** | |
1456 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1457 | * @genpd: Master PM domain to add the subdomain to. | |
1458 | * @subdomain: Subdomain to be added. | |
1459 | */ | |
1460 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1461 | struct generic_pm_domain *subdomain) | |
1462 | { | |
1463 | int ret; | |
1464 | ||
1465 | mutex_lock(&gpd_list_lock); | |
1466 | ret = genpd_add_subdomain(genpd, subdomain); | |
1467 | mutex_unlock(&gpd_list_lock); | |
1468 | ||
1469 | return ret; | |
1470 | } | |
d60ee966 | 1471 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1472 | |
1473 | /** | |
1474 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1475 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1476 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1477 | */ |
1478 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1479 | struct generic_pm_domain *subdomain) |
f721889f | 1480 | { |
c6e83cac | 1481 | struct gpd_link *l, *link; |
f721889f RW |
1482 | int ret = -EINVAL; |
1483 | ||
5063ce15 | 1484 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1485 | return -EINVAL; |
1486 | ||
35241d12 LI |
1487 | genpd_lock(subdomain); |
1488 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1489 | |
beda5fc1 | 1490 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1491 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1492 | subdomain->name); | |
1493 | ret = -EBUSY; | |
1494 | goto out; | |
1495 | } | |
1496 | ||
c6e83cac | 1497 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1498 | if (link->slave != subdomain) |
f721889f RW |
1499 | continue; |
1500 | ||
5063ce15 RW |
1501 | list_del(&link->master_node); |
1502 | list_del(&link->slave_node); | |
1503 | kfree(link); | |
41e2c8e0 | 1504 | if (genpd_status_on(subdomain)) |
f721889f RW |
1505 | genpd_sd_counter_dec(genpd); |
1506 | ||
f721889f RW |
1507 | ret = 0; |
1508 | break; | |
1509 | } | |
1510 | ||
30e7a65b | 1511 | out: |
35241d12 LI |
1512 | genpd_unlock(genpd); |
1513 | genpd_unlock(subdomain); | |
f721889f RW |
1514 | |
1515 | return ret; | |
1516 | } | |
d60ee966 | 1517 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1518 | |
59d65b73 LI |
1519 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1520 | { | |
1521 | struct genpd_power_state *state; | |
1522 | ||
1523 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1524 | if (!state) | |
1525 | return -ENOMEM; | |
1526 | ||
1527 | genpd->states = state; | |
1528 | genpd->state_count = 1; | |
1529 | genpd->free = state; | |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | ||
d716f479 LI |
1534 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1535 | { | |
1536 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1537 | spin_lock_init(&genpd->slock); | |
1538 | genpd->lock_ops = &genpd_spin_ops; | |
1539 | } else { | |
1540 | mutex_init(&genpd->mlock); | |
1541 | genpd->lock_ops = &genpd_mtx_ops; | |
1542 | } | |
1543 | } | |
1544 | ||
f721889f RW |
1545 | /** |
1546 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1547 | * @genpd: PM domain object to initialize. | |
1548 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1549 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1550 | * |
1551 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1552 | */ |
7eb231c3 UH |
1553 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1554 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1555 | { |
59d65b73 LI |
1556 | int ret; |
1557 | ||
f721889f | 1558 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1559 | return -EINVAL; |
f721889f | 1560 | |
5063ce15 RW |
1561 | INIT_LIST_HEAD(&genpd->master_links); |
1562 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1563 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1564 | genpd_lock_init(genpd); |
f721889f RW |
1565 | genpd->gov = gov; |
1566 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1567 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1568 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1569 | genpd->device_count = 0; |
221e9b58 | 1570 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1571 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1572 | genpd->provider = NULL; |
1573 | genpd->has_provider = false; | |
afece3ab | 1574 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1575 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1576 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
596ba34b | 1577 | genpd->domain.ops.prepare = pm_genpd_prepare; |
596ba34b RW |
1578 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1579 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
596ba34b RW |
1580 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1581 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
10da6542 | 1582 | genpd->domain.ops.poweroff_noirq = pm_genpd_poweroff_noirq; |
596ba34b | 1583 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
596ba34b | 1584 | genpd->domain.ops.complete = pm_genpd_complete; |
c11f6f5b UH |
1585 | |
1586 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1587 | genpd->dev_ops.stop = pm_clk_suspend; | |
1588 | genpd->dev_ops.start = pm_clk_resume; | |
1589 | } | |
1590 | ||
ffaa42e8 UH |
1591 | /* Always-on domains must be powered on at initialization. */ |
1592 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1593 | return -EINVAL; | |
1594 | ||
fc5cbf0c | 1595 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1596 | if (genpd->state_count == 0) { |
1597 | ret = genpd_set_default_power_state(genpd); | |
1598 | if (ret) | |
1599 | return ret; | |
1600 | } | |
fc5cbf0c | 1601 | |
5125bbf3 RW |
1602 | mutex_lock(&gpd_list_lock); |
1603 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1604 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1605 | |
1606 | return 0; | |
5125bbf3 | 1607 | } |
be5ed55d | 1608 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1609 | |
3fe57710 JH |
1610 | static int genpd_remove(struct generic_pm_domain *genpd) |
1611 | { | |
1612 | struct gpd_link *l, *link; | |
1613 | ||
1614 | if (IS_ERR_OR_NULL(genpd)) | |
1615 | return -EINVAL; | |
1616 | ||
35241d12 | 1617 | genpd_lock(genpd); |
3fe57710 JH |
1618 | |
1619 | if (genpd->has_provider) { | |
35241d12 | 1620 | genpd_unlock(genpd); |
3fe57710 JH |
1621 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1622 | return -EBUSY; | |
1623 | } | |
1624 | ||
1625 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1626 | genpd_unlock(genpd); |
3fe57710 JH |
1627 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1628 | return -EBUSY; | |
1629 | } | |
1630 | ||
1631 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1632 | list_del(&link->master_node); | |
1633 | list_del(&link->slave_node); | |
1634 | kfree(link); | |
1635 | } | |
1636 | ||
1637 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1638 | genpd_unlock(genpd); |
3fe57710 | 1639 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1640 | kfree(genpd->free); |
3fe57710 JH |
1641 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | /** | |
1647 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1648 | * @genpd: Pointer to PM domain that is to be removed. | |
1649 | * | |
1650 | * To remove the PM domain, this function: | |
1651 | * - Removes the PM domain as a subdomain to any parent domains, | |
1652 | * if it was added. | |
1653 | * - Removes the PM domain from the list of registered PM domains. | |
1654 | * | |
1655 | * The PM domain will only be removed, if the associated provider has | |
1656 | * been removed, it is not a parent to any other PM domain and has no | |
1657 | * devices associated with it. | |
1658 | */ | |
1659 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1660 | { | |
1661 | int ret; | |
1662 | ||
1663 | mutex_lock(&gpd_list_lock); | |
1664 | ret = genpd_remove(genpd); | |
1665 | mutex_unlock(&gpd_list_lock); | |
1666 | ||
1667 | return ret; | |
1668 | } | |
1669 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1670 | ||
aa42240a | 1671 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1672 | |
aa42240a TF |
1673 | /* |
1674 | * Device Tree based PM domain providers. | |
1675 | * | |
1676 | * The code below implements generic device tree based PM domain providers that | |
1677 | * bind device tree nodes with generic PM domains registered in the system. | |
1678 | * | |
1679 | * Any driver that registers generic PM domains and needs to support binding of | |
1680 | * devices to these domains is supposed to register a PM domain provider, which | |
1681 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1682 | * | |
1683 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1684 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1685 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1686 | * index. |
1687 | */ | |
1688 | ||
1689 | /** | |
1690 | * struct of_genpd_provider - PM domain provider registration structure | |
1691 | * @link: Entry in global list of PM domain providers | |
1692 | * @node: Pointer to device tree node of PM domain provider | |
1693 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1694 | * into a PM domain. | |
1695 | * @data: context pointer to be passed into @xlate callback | |
1696 | */ | |
1697 | struct of_genpd_provider { | |
1698 | struct list_head link; | |
1699 | struct device_node *node; | |
1700 | genpd_xlate_t xlate; | |
1701 | void *data; | |
1702 | }; | |
1703 | ||
1704 | /* List of registered PM domain providers. */ | |
1705 | static LIST_HEAD(of_genpd_providers); | |
1706 | /* Mutex to protect the list above. */ | |
1707 | static DEFINE_MUTEX(of_genpd_mutex); | |
1708 | ||
1709 | /** | |
892ebdcc | 1710 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1711 | * @genpdspec: OF phandle args to map into a PM domain |
1712 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1713 | * | |
1714 | * This is a generic xlate function that can be used to model PM domains that | |
1715 | * have their own device tree nodes. The private data of xlate function needs | |
1716 | * to be a valid pointer to struct generic_pm_domain. | |
1717 | */ | |
892ebdcc | 1718 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1719 | struct of_phandle_args *genpdspec, |
1720 | void *data) | |
1721 | { | |
aa42240a TF |
1722 | return data; |
1723 | } | |
aa42240a TF |
1724 | |
1725 | /** | |
892ebdcc | 1726 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1727 | * @genpdspec: OF phandle args to map into a PM domain |
1728 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1729 | * | |
1730 | * This is a generic xlate function that can be used to model simple PM domain | |
1731 | * controllers that have one device tree node and provide multiple PM domains. | |
1732 | * A single cell is used as an index into an array of PM domains specified in | |
1733 | * the genpd_onecell_data struct when registering the provider. | |
1734 | */ | |
892ebdcc | 1735 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1736 | struct of_phandle_args *genpdspec, |
1737 | void *data) | |
1738 | { | |
1739 | struct genpd_onecell_data *genpd_data = data; | |
1740 | unsigned int idx = genpdspec->args[0]; | |
1741 | ||
1742 | if (genpdspec->args_count != 1) | |
1743 | return ERR_PTR(-EINVAL); | |
1744 | ||
1745 | if (idx >= genpd_data->num_domains) { | |
1746 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1747 | return ERR_PTR(-EINVAL); | |
1748 | } | |
1749 | ||
1750 | if (!genpd_data->domains[idx]) | |
1751 | return ERR_PTR(-ENOENT); | |
1752 | ||
1753 | return genpd_data->domains[idx]; | |
1754 | } | |
aa42240a TF |
1755 | |
1756 | /** | |
892ebdcc | 1757 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1758 | * @np: Device node pointer associated with the PM domain provider. |
1759 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1760 | * @data: Context pointer for @xlate callback. | |
1761 | */ | |
892ebdcc JH |
1762 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1763 | void *data) | |
aa42240a TF |
1764 | { |
1765 | struct of_genpd_provider *cp; | |
1766 | ||
1767 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1768 | if (!cp) | |
1769 | return -ENOMEM; | |
1770 | ||
1771 | cp->node = of_node_get(np); | |
1772 | cp->data = data; | |
1773 | cp->xlate = xlate; | |
1774 | ||
1775 | mutex_lock(&of_genpd_mutex); | |
1776 | list_add(&cp->link, &of_genpd_providers); | |
1777 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1778 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1779 | |
1780 | return 0; | |
1781 | } | |
892ebdcc JH |
1782 | |
1783 | /** | |
1784 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1785 | * @np: Device node pointer associated with the PM domain provider. | |
1786 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1787 | */ | |
1788 | int of_genpd_add_provider_simple(struct device_node *np, | |
1789 | struct generic_pm_domain *genpd) | |
1790 | { | |
0159ec67 JH |
1791 | int ret = -EINVAL; |
1792 | ||
1793 | if (!np || !genpd) | |
1794 | return -EINVAL; | |
1795 | ||
1796 | mutex_lock(&gpd_list_lock); | |
1797 | ||
8ce95844 | 1798 | if (pm_genpd_present(genpd)) { |
0159ec67 | 1799 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
8ce95844 VK |
1800 | if (!ret) { |
1801 | genpd->provider = &np->fwnode; | |
1802 | genpd->has_provider = true; | |
1803 | } | |
de0aa06d JH |
1804 | } |
1805 | ||
0159ec67 JH |
1806 | mutex_unlock(&gpd_list_lock); |
1807 | ||
1808 | return ret; | |
892ebdcc JH |
1809 | } |
1810 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1811 | ||
1812 | /** | |
1813 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1814 | * @np: Device node pointer associated with the PM domain provider. | |
1815 | * @data: Pointer to the data associated with the PM domain provider. | |
1816 | */ | |
1817 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1818 | struct genpd_onecell_data *data) | |
1819 | { | |
0159ec67 | 1820 | unsigned int i; |
de0aa06d | 1821 | int ret = -EINVAL; |
0159ec67 JH |
1822 | |
1823 | if (!np || !data) | |
1824 | return -EINVAL; | |
1825 | ||
1826 | mutex_lock(&gpd_list_lock); | |
1827 | ||
40845524 TR |
1828 | if (!data->xlate) |
1829 | data->xlate = genpd_xlate_onecell; | |
1830 | ||
0159ec67 | 1831 | for (i = 0; i < data->num_domains; i++) { |
609bed67 TV |
1832 | if (!data->domains[i]) |
1833 | continue; | |
de0aa06d JH |
1834 | if (!pm_genpd_present(data->domains[i])) |
1835 | goto error; | |
1836 | ||
1837 | data->domains[i]->provider = &np->fwnode; | |
1838 | data->domains[i]->has_provider = true; | |
0159ec67 JH |
1839 | } |
1840 | ||
40845524 | 1841 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
1842 | if (ret < 0) |
1843 | goto error; | |
1844 | ||
1845 | mutex_unlock(&gpd_list_lock); | |
1846 | ||
1847 | return 0; | |
1848 | ||
1849 | error: | |
1850 | while (i--) { | |
609bed67 TV |
1851 | if (!data->domains[i]) |
1852 | continue; | |
de0aa06d JH |
1853 | data->domains[i]->provider = NULL; |
1854 | data->domains[i]->has_provider = false; | |
1855 | } | |
0159ec67 JH |
1856 | |
1857 | mutex_unlock(&gpd_list_lock); | |
1858 | ||
1859 | return ret; | |
892ebdcc JH |
1860 | } |
1861 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1862 | |
1863 | /** | |
1864 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1865 | * @np: Device node pointer associated with the PM domain provider | |
1866 | */ | |
1867 | void of_genpd_del_provider(struct device_node *np) | |
1868 | { | |
b556b15d | 1869 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 1870 | struct generic_pm_domain *gpd; |
aa42240a | 1871 | |
de0aa06d | 1872 | mutex_lock(&gpd_list_lock); |
aa42240a | 1873 | mutex_lock(&of_genpd_mutex); |
b556b15d | 1874 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 1875 | if (cp->node == np) { |
de0aa06d JH |
1876 | /* |
1877 | * For each PM domain associated with the | |
1878 | * provider, set the 'has_provider' to false | |
1879 | * so that the PM domain can be safely removed. | |
1880 | */ | |
1881 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
1882 | if (gpd->provider == &np->fwnode) | |
1883 | gpd->has_provider = false; | |
1884 | ||
aa42240a TF |
1885 | list_del(&cp->link); |
1886 | of_node_put(cp->node); | |
1887 | kfree(cp); | |
1888 | break; | |
1889 | } | |
1890 | } | |
1891 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 1892 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
1893 | } |
1894 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1895 | ||
1896 | /** | |
f58d4e5a | 1897 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
1898 | * @genpdspec: OF phandle args to use for look-up |
1899 | * | |
1900 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1901 | * found, uses xlate function of the provider to map phandle args to a PM | |
1902 | * domain. | |
1903 | * | |
1904 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1905 | * on failure. | |
1906 | */ | |
f58d4e5a | 1907 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
1908 | struct of_phandle_args *genpdspec) |
1909 | { | |
1910 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1911 | struct of_genpd_provider *provider; | |
1912 | ||
41795a8a JH |
1913 | if (!genpdspec) |
1914 | return ERR_PTR(-EINVAL); | |
1915 | ||
aa42240a TF |
1916 | mutex_lock(&of_genpd_mutex); |
1917 | ||
1918 | /* Check if we have such a provider in our array */ | |
1919 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1920 | if (provider->node == genpdspec->np) | |
1921 | genpd = provider->xlate(genpdspec, provider->data); | |
1922 | if (!IS_ERR(genpd)) | |
1923 | break; | |
1924 | } | |
1925 | ||
1926 | mutex_unlock(&of_genpd_mutex); | |
1927 | ||
1928 | return genpd; | |
1929 | } | |
1930 | ||
ec69572b JH |
1931 | /** |
1932 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
1933 | * @genpdspec: OF phandle args to use for look-up PM domain | |
1934 | * @dev: Device to be added. | |
1935 | * | |
1936 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
1937 | * the device to the PM domain. Returns a negative error code on failure. | |
1938 | */ | |
1939 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
1940 | { | |
1941 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
1942 | int ret; |
1943 | ||
1944 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1945 | |
f58d4e5a | 1946 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
1947 | if (IS_ERR(genpd)) { |
1948 | ret = PTR_ERR(genpd); | |
1949 | goto out; | |
1950 | } | |
1951 | ||
1952 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 1953 | |
19efa5ff JH |
1954 | out: |
1955 | mutex_unlock(&gpd_list_lock); | |
1956 | ||
1957 | return ret; | |
ec69572b JH |
1958 | } |
1959 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
1960 | ||
1961 | /** | |
1962 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1963 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
1964 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
1965 | * | |
1966 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
1967 | * provided and adds the subdomain to the parent PM domain. Returns a | |
1968 | * negative error code on failure. | |
1969 | */ | |
1970 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
1971 | struct of_phandle_args *subdomain_spec) | |
1972 | { | |
1973 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
1974 | int ret; |
1975 | ||
1976 | mutex_lock(&gpd_list_lock); | |
ec69572b | 1977 | |
f58d4e5a | 1978 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
1979 | if (IS_ERR(parent)) { |
1980 | ret = PTR_ERR(parent); | |
1981 | goto out; | |
1982 | } | |
ec69572b | 1983 | |
f58d4e5a | 1984 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
1985 | if (IS_ERR(subdomain)) { |
1986 | ret = PTR_ERR(subdomain); | |
1987 | goto out; | |
1988 | } | |
1989 | ||
1990 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 1991 | |
19efa5ff JH |
1992 | out: |
1993 | mutex_unlock(&gpd_list_lock); | |
1994 | ||
1995 | return ret; | |
ec69572b JH |
1996 | } |
1997 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
1998 | ||
17926551 JH |
1999 | /** |
2000 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2001 | * @provider: Pointer to device structure associated with provider | |
2002 | * | |
2003 | * Find the last PM domain that was added by a particular provider and | |
2004 | * remove this PM domain from the list of PM domains. The provider is | |
2005 | * identified by the 'provider' device structure that is passed. The PM | |
2006 | * domain will only be removed, if the provider associated with domain | |
2007 | * has been removed. | |
2008 | * | |
2009 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2010 | * ERR_PTR() on failure. | |
2011 | */ | |
2012 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2013 | { | |
a7e2d1bc | 2014 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2015 | int ret; |
2016 | ||
2017 | if (IS_ERR_OR_NULL(np)) | |
2018 | return ERR_PTR(-EINVAL); | |
2019 | ||
2020 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2021 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2022 | if (gpd->provider == &np->fwnode) { |
2023 | ret = genpd_remove(gpd); | |
2024 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2025 | break; | |
2026 | } | |
2027 | } | |
2028 | mutex_unlock(&gpd_list_lock); | |
2029 | ||
2030 | return genpd; | |
2031 | } | |
2032 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2033 | ||
aa42240a TF |
2034 | /** |
2035 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2036 | * @dev: Device to detach. |
aa42240a TF |
2037 | * @power_off: Currently not used |
2038 | * | |
2039 | * Try to locate a corresponding generic PM domain, which the device was | |
2040 | * attached to previously. If such is found, the device is detached from it. | |
2041 | */ | |
2042 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2043 | { | |
446d999c | 2044 | struct generic_pm_domain *pd; |
93af5e93 | 2045 | unsigned int i; |
aa42240a TF |
2046 | int ret = 0; |
2047 | ||
85168d56 UH |
2048 | pd = dev_to_genpd(dev); |
2049 | if (IS_ERR(pd)) | |
aa42240a TF |
2050 | return; |
2051 | ||
2052 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2053 | ||
93af5e93 | 2054 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2055 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2056 | if (ret != -EAGAIN) |
2057 | break; | |
93af5e93 GU |
2058 | |
2059 | mdelay(i); | |
aa42240a TF |
2060 | cond_resched(); |
2061 | } | |
2062 | ||
2063 | if (ret < 0) { | |
2064 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2065 | pd->name, ret); | |
2066 | return; | |
2067 | } | |
2068 | ||
2069 | /* Check if PM domain can be powered off after removing this device. */ | |
2070 | genpd_queue_power_off_work(pd); | |
2071 | } | |
2072 | ||
632f7ce3 RK |
2073 | static void genpd_dev_pm_sync(struct device *dev) |
2074 | { | |
2075 | struct generic_pm_domain *pd; | |
2076 | ||
2077 | pd = dev_to_genpd(dev); | |
2078 | if (IS_ERR(pd)) | |
2079 | return; | |
2080 | ||
2081 | genpd_queue_power_off_work(pd); | |
2082 | } | |
2083 | ||
aa42240a TF |
2084 | /** |
2085 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2086 | * @dev: Device to attach. | |
2087 | * | |
2088 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2089 | * attaches the device to retrieved pm_domain ops. | |
2090 | * | |
2091 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2092 | * backwards compatibility with existing DTBs. | |
2093 | * | |
311fa6ad JH |
2094 | * Returns 0 on successfully attached PM domain or negative error code. Note |
2095 | * that if a power-domain exists for the device, but it cannot be found or | |
2096 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
2097 | * probed and to re-try again later. | |
aa42240a TF |
2098 | */ |
2099 | int genpd_dev_pm_attach(struct device *dev) | |
2100 | { | |
2101 | struct of_phandle_args pd_args; | |
2102 | struct generic_pm_domain *pd; | |
93af5e93 | 2103 | unsigned int i; |
aa42240a TF |
2104 | int ret; |
2105 | ||
2106 | if (!dev->of_node) | |
2107 | return -ENODEV; | |
2108 | ||
2109 | if (dev->pm_domain) | |
2110 | return -EEXIST; | |
2111 | ||
2112 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2113 | "#power-domain-cells", 0, &pd_args); | |
2114 | if (ret < 0) { | |
2115 | if (ret != -ENOENT) | |
2116 | return ret; | |
2117 | ||
2118 | /* | |
2119 | * Try legacy Samsung-specific bindings | |
2120 | * (for backwards compatibility of DT ABI) | |
2121 | */ | |
2122 | pd_args.args_count = 0; | |
2123 | pd_args.np = of_parse_phandle(dev->of_node, | |
2124 | "samsung,power-domain", 0); | |
2125 | if (!pd_args.np) | |
2126 | return -ENOENT; | |
2127 | } | |
2128 | ||
19efa5ff | 2129 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2130 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2131 | of_node_put(pd_args.np); |
aa42240a | 2132 | if (IS_ERR(pd)) { |
19efa5ff | 2133 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2134 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2135 | __func__, PTR_ERR(pd)); | |
311fa6ad | 2136 | return -EPROBE_DEFER; |
aa42240a TF |
2137 | } |
2138 | ||
2139 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2140 | ||
93af5e93 | 2141 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
19efa5ff | 2142 | ret = genpd_add_device(pd, dev, NULL); |
aa42240a TF |
2143 | if (ret != -EAGAIN) |
2144 | break; | |
93af5e93 GU |
2145 | |
2146 | mdelay(i); | |
aa42240a TF |
2147 | cond_resched(); |
2148 | } | |
19efa5ff | 2149 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2150 | |
2151 | if (ret < 0) { | |
34994692 GU |
2152 | if (ret != -EPROBE_DEFER) |
2153 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2154 | pd->name, ret); | |
311fa6ad | 2155 | goto out; |
aa42240a TF |
2156 | } |
2157 | ||
2158 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2159 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2160 | |
35241d12 | 2161 | genpd_lock(pd); |
86e12eac | 2162 | ret = genpd_power_on(pd, 0); |
35241d12 | 2163 | genpd_unlock(pd); |
311fa6ad JH |
2164 | out: |
2165 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2166 | } |
2167 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
30f60428 LI |
2168 | |
2169 | static const struct of_device_id idle_state_match[] = { | |
598da548 | 2170 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2171 | { } |
2172 | }; | |
2173 | ||
2174 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2175 | struct device_node *state_node) | |
2176 | { | |
2177 | int err; | |
2178 | u32 residency; | |
2179 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2180 | |
2181 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2182 | &entry_latency); | |
2183 | if (err) { | |
ea11e94b RH |
2184 | pr_debug(" * %pOF missing entry-latency-us property\n", |
2185 | state_node); | |
30f60428 LI |
2186 | return -EINVAL; |
2187 | } | |
2188 | ||
2189 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2190 | &exit_latency); | |
2191 | if (err) { | |
ea11e94b RH |
2192 | pr_debug(" * %pOF missing exit-latency-us property\n", |
2193 | state_node); | |
30f60428 LI |
2194 | return -EINVAL; |
2195 | } | |
2196 | ||
2197 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2198 | if (!err) | |
2199 | genpd_state->residency_ns = 1000 * residency; | |
2200 | ||
2201 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2202 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2203 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2204 | |
2205 | return 0; | |
2206 | } | |
2207 | ||
2208 | /** | |
2209 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2210 | * | |
2211 | * @dn: The genpd device node | |
2212 | * @states: The pointer to which the state array will be saved. | |
2213 | * @n: The count of elements in the array returned from this function. | |
2214 | * | |
2215 | * Returns the device states parsed from the OF node. The memory for the states | |
2216 | * is allocated by this function and is the responsibility of the caller to | |
2217 | * free the memory after use. | |
2218 | */ | |
2219 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2220 | struct genpd_power_state **states, int *n) | |
2221 | { | |
2222 | struct genpd_power_state *st; | |
2223 | struct device_node *np; | |
2224 | int i = 0; | |
2225 | int err, ret; | |
2226 | int count; | |
2227 | struct of_phandle_iterator it; | |
b539cc82 | 2228 | const struct of_device_id *match_id; |
30f60428 LI |
2229 | |
2230 | count = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
a1fee00d | 2231 | if (count <= 0) |
30f60428 LI |
2232 | return -EINVAL; |
2233 | ||
2234 | st = kcalloc(count, sizeof(*st), GFP_KERNEL); | |
2235 | if (!st) | |
2236 | return -ENOMEM; | |
2237 | ||
2238 | /* Loop over the phandles until all the requested entry is found */ | |
2239 | of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) { | |
2240 | np = it.node; | |
b539cc82 LI |
2241 | match_id = of_match_node(idle_state_match, np); |
2242 | if (!match_id) | |
2243 | continue; | |
30f60428 LI |
2244 | ret = genpd_parse_state(&st[i++], np); |
2245 | if (ret) { | |
2246 | pr_err | |
ea11e94b RH |
2247 | ("Parsing idle state node %pOF failed with err %d\n", |
2248 | np, ret); | |
30f60428 LI |
2249 | of_node_put(np); |
2250 | kfree(st); | |
2251 | return ret; | |
2252 | } | |
2253 | } | |
2254 | ||
b539cc82 LI |
2255 | *n = i; |
2256 | if (!i) | |
2257 | kfree(st); | |
2258 | else | |
2259 | *states = st; | |
30f60428 LI |
2260 | |
2261 | return 0; | |
2262 | } | |
2263 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2264 | ||
d30d819d | 2265 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2266 | |
2267 | ||
2268 | /*** debugfs support ***/ | |
2269 | ||
8b0510b5 | 2270 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2271 | #include <linux/pm.h> |
2272 | #include <linux/device.h> | |
2273 | #include <linux/debugfs.h> | |
2274 | #include <linux/seq_file.h> | |
2275 | #include <linux/init.h> | |
2276 | #include <linux/kobject.h> | |
2277 | static struct dentry *pm_genpd_debugfs_dir; | |
2278 | ||
2279 | /* | |
2280 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2281 | * from sysfs.c, so generalize it. |
2bd5306a | 2282 | */ |
2bd5306a MM |
2283 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2284 | { | |
2285 | static const char * const status_lookup[] = { | |
2286 | [RPM_ACTIVE] = "active", | |
2287 | [RPM_RESUMING] = "resuming", | |
2288 | [RPM_SUSPENDED] = "suspended", | |
2289 | [RPM_SUSPENDING] = "suspending" | |
2290 | }; | |
2291 | const char *p = ""; | |
2292 | ||
2293 | if (dev->power.runtime_error) | |
2294 | p = "error"; | |
2295 | else if (dev->power.disable_depth) | |
2296 | p = "unsupported"; | |
2297 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2298 | p = status_lookup[dev->power.runtime_status]; | |
2299 | else | |
2300 | WARN_ON(1); | |
2301 | ||
2302 | seq_puts(s, p); | |
2303 | } | |
2bd5306a MM |
2304 | |
2305 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2306 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2307 | { |
2308 | static const char * const status_lookup[] = { | |
2309 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2310 | [GPD_STATE_POWER_OFF] = "off" |
2311 | }; | |
2312 | struct pm_domain_data *pm_data; | |
2313 | const char *kobj_path; | |
2314 | struct gpd_link *link; | |
6954d432 | 2315 | char state[16]; |
2bd5306a MM |
2316 | int ret; |
2317 | ||
35241d12 | 2318 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2319 | if (ret) |
2320 | return -ERESTARTSYS; | |
2321 | ||
66a5ca4b | 2322 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2323 | goto exit; |
41e2c8e0 | 2324 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2325 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2326 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2327 | else |
6954d432 GU |
2328 | snprintf(state, sizeof(state), "%s", |
2329 | status_lookup[genpd->status]); | |
2330 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2331 | |
2332 | /* | |
2333 | * Modifications on the list require holding locks on both | |
2334 | * master and slave, so we are safe. | |
66a5ca4b | 2335 | * Also genpd->name is immutable. |
2bd5306a | 2336 | */ |
66a5ca4b | 2337 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2338 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2339 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2340 | seq_puts(s, ", "); |
2341 | } | |
2342 | ||
66a5ca4b | 2343 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2344 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2345 | genpd_is_irq_safe(genpd) ? | |
2346 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2347 | if (kobj_path == NULL) |
2348 | continue; | |
2349 | ||
2350 | seq_printf(s, "\n %-50s ", kobj_path); | |
2351 | rtpm_status_str(s, pm_data->dev); | |
2352 | kfree(kobj_path); | |
2353 | } | |
2354 | ||
2355 | seq_puts(s, "\n"); | |
2356 | exit: | |
35241d12 | 2357 | genpd_unlock(genpd); |
2bd5306a MM |
2358 | |
2359 | return 0; | |
2360 | } | |
2361 | ||
b6a1d093 | 2362 | static int genpd_summary_show(struct seq_file *s, void *data) |
2bd5306a | 2363 | { |
66a5ca4b | 2364 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2365 | int ret = 0; |
2366 | ||
15dec67a GU |
2367 | seq_puts(s, "domain status slaves\n"); |
2368 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2369 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2370 | ||
2371 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2372 | if (ret) | |
2373 | return -ERESTARTSYS; | |
2374 | ||
66a5ca4b KH |
2375 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2376 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2377 | if (ret) |
2378 | break; | |
2379 | } | |
2380 | mutex_unlock(&gpd_list_lock); | |
2381 | ||
2382 | return ret; | |
2383 | } | |
2384 | ||
b6a1d093 | 2385 | static int genpd_status_show(struct seq_file *s, void *data) |
2bd5306a | 2386 | { |
b6a1d093 TG |
2387 | static const char * const status_lookup[] = { |
2388 | [GPD_STATE_ACTIVE] = "on", | |
2389 | [GPD_STATE_POWER_OFF] = "off" | |
2390 | }; | |
2391 | ||
2392 | struct generic_pm_domain *genpd = s->private; | |
2393 | int ret = 0; | |
2394 | ||
2395 | ret = genpd_lock_interruptible(genpd); | |
2396 | if (ret) | |
2397 | return -ERESTARTSYS; | |
2398 | ||
2399 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2400 | goto exit; | |
2401 | ||
2402 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2403 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2404 | genpd->state_idx); | |
2405 | else | |
2406 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2407 | exit: | |
2408 | genpd_unlock(genpd); | |
2409 | return ret; | |
2bd5306a MM |
2410 | } |
2411 | ||
b6a1d093 TG |
2412 | static int genpd_sub_domains_show(struct seq_file *s, void *data) |
2413 | { | |
2414 | struct generic_pm_domain *genpd = s->private; | |
2415 | struct gpd_link *link; | |
2416 | int ret = 0; | |
2417 | ||
2418 | ret = genpd_lock_interruptible(genpd); | |
2419 | if (ret) | |
2420 | return -ERESTARTSYS; | |
2421 | ||
2422 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2423 | seq_printf(s, "%s\n", link->slave->name); | |
2424 | ||
2425 | genpd_unlock(genpd); | |
2426 | return ret; | |
2427 | } | |
2428 | ||
2429 | static int genpd_idle_states_show(struct seq_file *s, void *data) | |
2430 | { | |
2431 | struct generic_pm_domain *genpd = s->private; | |
2432 | unsigned int i; | |
2433 | int ret = 0; | |
2434 | ||
2435 | ret = genpd_lock_interruptible(genpd); | |
2436 | if (ret) | |
2437 | return -ERESTARTSYS; | |
2438 | ||
2439 | seq_puts(s, "State Time Spent(ms)\n"); | |
2440 | ||
2441 | for (i = 0; i < genpd->state_count; i++) { | |
2442 | ktime_t delta = 0; | |
2443 | s64 msecs; | |
2444 | ||
2445 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2446 | (genpd->state_idx == i)) | |
2447 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2448 | ||
2449 | msecs = ktime_to_ms( | |
2450 | ktime_add(genpd->states[i].idle_time, delta)); | |
2451 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2452 | } | |
2453 | ||
2454 | genpd_unlock(genpd); | |
2455 | return ret; | |
2456 | } | |
2457 | ||
2458 | static int genpd_active_time_show(struct seq_file *s, void *data) | |
2459 | { | |
2460 | struct generic_pm_domain *genpd = s->private; | |
2461 | ktime_t delta = 0; | |
2462 | int ret = 0; | |
2463 | ||
2464 | ret = genpd_lock_interruptible(genpd); | |
2465 | if (ret) | |
2466 | return -ERESTARTSYS; | |
2467 | ||
2468 | if (genpd->status == GPD_STATE_ACTIVE) | |
2469 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2470 | ||
2471 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2472 | ktime_add(genpd->on_time, delta))); | |
2473 | ||
2474 | genpd_unlock(genpd); | |
2475 | return ret; | |
2476 | } | |
2477 | ||
2478 | static int genpd_total_idle_time_show(struct seq_file *s, void *data) | |
2479 | { | |
2480 | struct generic_pm_domain *genpd = s->private; | |
2481 | ktime_t delta = 0, total = 0; | |
2482 | unsigned int i; | |
2483 | int ret = 0; | |
2484 | ||
2485 | ret = genpd_lock_interruptible(genpd); | |
2486 | if (ret) | |
2487 | return -ERESTARTSYS; | |
2488 | ||
2489 | for (i = 0; i < genpd->state_count; i++) { | |
2490 | ||
2491 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2492 | (genpd->state_idx == i)) | |
2493 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2494 | ||
2495 | total = ktime_add(total, genpd->states[i].idle_time); | |
2496 | } | |
2497 | total = ktime_add(total, delta); | |
2498 | ||
2499 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2500 | ||
2501 | genpd_unlock(genpd); | |
2502 | return ret; | |
2503 | } | |
2504 | ||
2505 | ||
2506 | static int genpd_devices_show(struct seq_file *s, void *data) | |
2507 | { | |
2508 | struct generic_pm_domain *genpd = s->private; | |
2509 | struct pm_domain_data *pm_data; | |
2510 | const char *kobj_path; | |
2511 | int ret = 0; | |
2512 | ||
2513 | ret = genpd_lock_interruptible(genpd); | |
2514 | if (ret) | |
2515 | return -ERESTARTSYS; | |
2516 | ||
2517 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2518 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2519 | genpd_is_irq_safe(genpd) ? | |
2520 | GFP_ATOMIC : GFP_KERNEL); | |
2521 | if (kobj_path == NULL) | |
2522 | continue; | |
2523 | ||
2524 | seq_printf(s, "%s\n", kobj_path); | |
2525 | kfree(kobj_path); | |
2526 | } | |
2527 | ||
2528 | genpd_unlock(genpd); | |
2529 | return ret; | |
2530 | } | |
2531 | ||
2532 | #define define_genpd_open_function(name) \ | |
2533 | static int genpd_##name##_open(struct inode *inode, struct file *file) \ | |
2534 | { \ | |
2535 | return single_open(file, genpd_##name##_show, inode->i_private); \ | |
2536 | } | |
2537 | ||
2538 | define_genpd_open_function(summary); | |
2539 | define_genpd_open_function(status); | |
2540 | define_genpd_open_function(sub_domains); | |
2541 | define_genpd_open_function(idle_states); | |
2542 | define_genpd_open_function(active_time); | |
2543 | define_genpd_open_function(total_idle_time); | |
2544 | define_genpd_open_function(devices); | |
2545 | ||
2546 | #define define_genpd_debugfs_fops(name) \ | |
2547 | static const struct file_operations genpd_##name##_fops = { \ | |
2548 | .open = genpd_##name##_open, \ | |
2549 | .read = seq_read, \ | |
2550 | .llseek = seq_lseek, \ | |
2551 | .release = single_release, \ | |
2552 | } | |
2553 | ||
2554 | define_genpd_debugfs_fops(summary); | |
2555 | define_genpd_debugfs_fops(status); | |
2556 | define_genpd_debugfs_fops(sub_domains); | |
2557 | define_genpd_debugfs_fops(idle_states); | |
2558 | define_genpd_debugfs_fops(active_time); | |
2559 | define_genpd_debugfs_fops(total_idle_time); | |
2560 | define_genpd_debugfs_fops(devices); | |
2bd5306a MM |
2561 | |
2562 | static int __init pm_genpd_debug_init(void) | |
2563 | { | |
2564 | struct dentry *d; | |
b6a1d093 | 2565 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2566 | |
2567 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2568 | ||
2569 | if (!pm_genpd_debugfs_dir) | |
2570 | return -ENOMEM; | |
2571 | ||
2572 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
b6a1d093 | 2573 | pm_genpd_debugfs_dir, NULL, &genpd_summary_fops); |
2bd5306a MM |
2574 | if (!d) |
2575 | return -ENOMEM; | |
2576 | ||
b6a1d093 TG |
2577 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2578 | d = debugfs_create_dir(genpd->name, pm_genpd_debugfs_dir); | |
2579 | if (!d) | |
2580 | return -ENOMEM; | |
2581 | ||
2582 | debugfs_create_file("current_state", 0444, | |
2583 | d, genpd, &genpd_status_fops); | |
2584 | debugfs_create_file("sub_domains", 0444, | |
2585 | d, genpd, &genpd_sub_domains_fops); | |
2586 | debugfs_create_file("idle_states", 0444, | |
2587 | d, genpd, &genpd_idle_states_fops); | |
2588 | debugfs_create_file("active_time", 0444, | |
2589 | d, genpd, &genpd_active_time_fops); | |
2590 | debugfs_create_file("total_idle_time", 0444, | |
2591 | d, genpd, &genpd_total_idle_time_fops); | |
2592 | debugfs_create_file("devices", 0444, | |
2593 | d, genpd, &genpd_devices_fops); | |
2594 | } | |
2595 | ||
2bd5306a MM |
2596 | return 0; |
2597 | } | |
2598 | late_initcall(pm_genpd_debug_init); | |
2599 | ||
2600 | static void __exit pm_genpd_debug_exit(void) | |
2601 | { | |
2602 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2603 | } | |
2604 | __exitcall(pm_genpd_debug_exit); | |
8b0510b5 | 2605 | #endif /* CONFIG_DEBUG_FS */ |