Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
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 | ||
42f6284a VK |
240 | /** |
241 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
242 | * domain. | |
243 | * | |
244 | * @dev: Device for which the performance-state needs to be set. | |
245 | * @state: Target performance state of the device. This can be set as 0 when the | |
246 | * device doesn't have any performance state constraints left (And so | |
247 | * the device wouldn't participate anymore to find the target | |
248 | * performance state of the genpd). | |
249 | * | |
250 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
251 | * while this routine is getting called. | |
252 | * | |
253 | * Returns 0 on success and negative error values on failures. | |
254 | */ | |
255 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
256 | { | |
257 | struct generic_pm_domain *genpd; | |
258 | struct generic_pm_domain_data *gpd_data, *pd_data; | |
259 | struct pm_domain_data *pdd; | |
260 | unsigned int prev; | |
261 | int ret = 0; | |
262 | ||
263 | genpd = dev_to_genpd(dev); | |
264 | if (IS_ERR(genpd)) | |
265 | return -ENODEV; | |
266 | ||
267 | if (unlikely(!genpd->set_performance_state)) | |
268 | return -EINVAL; | |
269 | ||
270 | if (unlikely(!dev->power.subsys_data || | |
271 | !dev->power.subsys_data->domain_data)) { | |
272 | WARN_ON(1); | |
273 | return -EINVAL; | |
274 | } | |
275 | ||
276 | genpd_lock(genpd); | |
277 | ||
278 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
279 | prev = gpd_data->performance_state; | |
280 | gpd_data->performance_state = state; | |
281 | ||
282 | /* New requested state is same as Max requested state */ | |
283 | if (state == genpd->performance_state) | |
284 | goto unlock; | |
285 | ||
286 | /* New requested state is higher than Max requested state */ | |
287 | if (state > genpd->performance_state) | |
288 | goto update_state; | |
289 | ||
290 | /* Traverse all devices within the domain */ | |
291 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
292 | pd_data = to_gpd_data(pdd); | |
293 | ||
294 | if (pd_data->performance_state > state) | |
295 | state = pd_data->performance_state; | |
296 | } | |
297 | ||
298 | if (state == genpd->performance_state) | |
299 | goto unlock; | |
300 | ||
301 | /* | |
302 | * We aren't propagating performance state changes of a subdomain to its | |
303 | * masters as we don't have hardware that needs it. Over that, the | |
304 | * performance states of subdomain and its masters may not have | |
305 | * one-to-one mapping and would require additional information. We can | |
306 | * get back to this once we have hardware that needs it. For that | |
307 | * reason, we don't have to consider performance state of the subdomains | |
308 | * of genpd here. | |
309 | */ | |
310 | ||
311 | update_state: | |
312 | if (genpd_status_on(genpd)) { | |
313 | ret = genpd->set_performance_state(genpd, state); | |
314 | if (ret) { | |
315 | gpd_data->performance_state = prev; | |
316 | goto unlock; | |
317 | } | |
318 | } | |
319 | ||
320 | genpd->performance_state = state; | |
321 | ||
322 | unlock: | |
323 | genpd_unlock(genpd); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
328 | ||
86e12eac | 329 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 330 | { |
fc5cbf0c | 331 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
332 | ktime_t time_start; |
333 | s64 elapsed_ns; | |
334 | int ret; | |
335 | ||
336 | if (!genpd->power_on) | |
337 | return 0; | |
338 | ||
a4630c61 GU |
339 | if (!timed) |
340 | return genpd->power_on(genpd); | |
341 | ||
c8f0ea45 GU |
342 | time_start = ktime_get(); |
343 | ret = genpd->power_on(genpd); | |
344 | if (ret) | |
345 | return ret; | |
346 | ||
347 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
42f6284a VK |
348 | |
349 | if (unlikely(genpd->set_performance_state)) { | |
350 | ret = genpd->set_performance_state(genpd, genpd->performance_state); | |
351 | if (ret) { | |
352 | pr_warn("%s: Failed to set performance state %d (%d)\n", | |
353 | genpd->name, genpd->performance_state, ret); | |
354 | } | |
355 | } | |
356 | ||
fc5cbf0c | 357 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
358 | return ret; |
359 | ||
fc5cbf0c | 360 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 361 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
362 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
363 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
364 | |
365 | return ret; | |
366 | } | |
367 | ||
86e12eac | 368 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 369 | { |
fc5cbf0c | 370 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
371 | ktime_t time_start; |
372 | s64 elapsed_ns; | |
373 | int ret; | |
374 | ||
375 | if (!genpd->power_off) | |
376 | return 0; | |
377 | ||
a4630c61 GU |
378 | if (!timed) |
379 | return genpd->power_off(genpd); | |
380 | ||
c8f0ea45 GU |
381 | time_start = ktime_get(); |
382 | ret = genpd->power_off(genpd); | |
383 | if (ret == -EBUSY) | |
384 | return ret; | |
385 | ||
386 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 387 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
388 | return ret; |
389 | ||
fc5cbf0c | 390 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 391 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
392 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
393 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
394 | |
395 | return ret; | |
396 | } | |
397 | ||
29e47e21 | 398 | /** |
86e12eac | 399 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 400 | * @genpd: PM domain to power off. |
29e47e21 | 401 | * |
86e12eac | 402 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
403 | * before. |
404 | */ | |
405 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
406 | { | |
407 | queue_work(pm_wq, &genpd->power_off_work); | |
408 | } | |
409 | ||
1f8728b7 UH |
410 | /** |
411 | * genpd_power_off - Remove power from a given PM domain. | |
412 | * @genpd: PM domain to power down. | |
3c64649d UH |
413 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
414 | * RPM status of the releated device is in an intermediate state, not yet turned | |
415 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
416 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
417 | * |
418 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
419 | * have been powered down, remove power from @genpd. | |
420 | */ | |
2da83545 UH |
421 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
422 | unsigned int depth) | |
1f8728b7 UH |
423 | { |
424 | struct pm_domain_data *pdd; | |
425 | struct gpd_link *link; | |
426 | unsigned int not_suspended = 0; | |
427 | ||
428 | /* | |
429 | * Do not try to power off the domain in the following situations: | |
430 | * (1) The domain is already in the "power off" state. | |
431 | * (2) System suspend is in progress. | |
432 | */ | |
41e2c8e0 | 433 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
434 | return 0; |
435 | ||
ffaa42e8 UH |
436 | /* |
437 | * Abort power off for the PM domain in the following situations: | |
438 | * (1) The domain is configured as always on. | |
439 | * (2) When the domain has a subdomain being powered on. | |
440 | */ | |
441 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
442 | return -EBUSY; |
443 | ||
444 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
445 | enum pm_qos_flags_status stat; | |
446 | ||
447 | stat = dev_pm_qos_flags(pdd->dev, | |
448 | PM_QOS_FLAG_NO_POWER_OFF | |
449 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
450 | if (stat > PM_QOS_FLAGS_NONE) | |
451 | return -EBUSY; | |
452 | ||
453 | /* | |
454 | * Do not allow PM domain to be powered off, when an IRQ safe | |
455 | * device is part of a non-IRQ safe domain. | |
456 | */ | |
457 | if (!pm_runtime_suspended(pdd->dev) || | |
458 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
459 | not_suspended++; | |
460 | } | |
461 | ||
3c64649d | 462 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
463 | return -EBUSY; |
464 | ||
465 | if (genpd->gov && genpd->gov->power_down_ok) { | |
466 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
467 | return -EAGAIN; | |
468 | } | |
469 | ||
470 | if (genpd->power_off) { | |
471 | int ret; | |
472 | ||
473 | if (atomic_read(&genpd->sd_count) > 0) | |
474 | return -EBUSY; | |
475 | ||
476 | /* | |
477 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
478 | * managed to call genpd_power_on() for the master yet after | |
479 | * incrementing it. In that case genpd_power_on() will wait | |
480 | * for us to drop the lock, so we can call .power_off() and let | |
481 | * the genpd_power_on() restore power for us (this shouldn't | |
482 | * happen very often). | |
483 | */ | |
484 | ret = _genpd_power_off(genpd, true); | |
485 | if (ret) | |
486 | return ret; | |
487 | } | |
488 | ||
489 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 490 | genpd_update_accounting(genpd); |
1f8728b7 UH |
491 | |
492 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
493 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
494 | genpd_lock_nested(link->master, depth + 1); |
495 | genpd_power_off(link->master, false, depth + 1); | |
496 | genpd_unlock(link->master); | |
1f8728b7 UH |
497 | } |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
5248051b | 502 | /** |
86e12eac | 503 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 504 | * @genpd: PM domain to power up. |
0106ef51 | 505 | * @depth: nesting count for lockdep. |
5248051b | 506 | * |
5063ce15 | 507 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
508 | * resume a device belonging to it. |
509 | */ | |
86e12eac | 510 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 511 | { |
5063ce15 | 512 | struct gpd_link *link; |
5248051b RW |
513 | int ret = 0; |
514 | ||
41e2c8e0 | 515 | if (genpd_status_on(genpd)) |
3f241775 | 516 | return 0; |
5248051b | 517 | |
5063ce15 RW |
518 | /* |
519 | * The list is guaranteed not to change while the loop below is being | |
520 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
521 | * with it. | |
522 | */ | |
523 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
524 | struct generic_pm_domain *master = link->master; |
525 | ||
526 | genpd_sd_counter_inc(master); | |
527 | ||
35241d12 | 528 | genpd_lock_nested(master, depth + 1); |
86e12eac | 529 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 530 | genpd_unlock(master); |
5248051b | 531 | |
5063ce15 | 532 | if (ret) { |
0106ef51 | 533 | genpd_sd_counter_dec(master); |
9e08cf42 | 534 | goto err; |
5063ce15 | 535 | } |
5248051b RW |
536 | } |
537 | ||
86e12eac | 538 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
539 | if (ret) |
540 | goto err; | |
5248051b | 541 | |
ba2bbfbf | 542 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
543 | genpd_update_accounting(genpd); |
544 | ||
3f241775 | 545 | return 0; |
9e08cf42 RW |
546 | |
547 | err: | |
29e47e21 UH |
548 | list_for_each_entry_continue_reverse(link, |
549 | &genpd->slave_links, | |
550 | slave_node) { | |
5063ce15 | 551 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
552 | genpd_lock_nested(link->master, depth + 1); |
553 | genpd_power_off(link->master, false, depth + 1); | |
554 | genpd_unlock(link->master); | |
29e47e21 | 555 | } |
9e08cf42 | 556 | |
3f241775 RW |
557 | return ret; |
558 | } | |
559 | ||
6ff7bb0d RW |
560 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
561 | unsigned long val, void *ptr) | |
562 | { | |
563 | struct generic_pm_domain_data *gpd_data; | |
564 | struct device *dev; | |
565 | ||
566 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 567 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
568 | |
569 | for (;;) { | |
570 | struct generic_pm_domain *genpd; | |
571 | struct pm_domain_data *pdd; | |
572 | ||
573 | spin_lock_irq(&dev->power.lock); | |
574 | ||
575 | pdd = dev->power.subsys_data ? | |
576 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 577 | if (pdd) { |
6ff7bb0d RW |
578 | to_gpd_data(pdd)->td.constraint_changed = true; |
579 | genpd = dev_to_genpd(dev); | |
580 | } else { | |
581 | genpd = ERR_PTR(-ENODATA); | |
582 | } | |
583 | ||
584 | spin_unlock_irq(&dev->power.lock); | |
585 | ||
586 | if (!IS_ERR(genpd)) { | |
35241d12 | 587 | genpd_lock(genpd); |
6ff7bb0d | 588 | genpd->max_off_time_changed = true; |
35241d12 | 589 | genpd_unlock(genpd); |
6ff7bb0d RW |
590 | } |
591 | ||
592 | dev = dev->parent; | |
593 | if (!dev || dev->power.ignore_children) | |
594 | break; | |
595 | } | |
596 | ||
597 | return NOTIFY_DONE; | |
598 | } | |
599 | ||
f721889f RW |
600 | /** |
601 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
602 | * @work: Work structure used for scheduling the execution of this function. | |
603 | */ | |
604 | static void genpd_power_off_work_fn(struct work_struct *work) | |
605 | { | |
606 | struct generic_pm_domain *genpd; | |
607 | ||
608 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
609 | ||
35241d12 | 610 | genpd_lock(genpd); |
2da83545 | 611 | genpd_power_off(genpd, false, 0); |
35241d12 | 612 | genpd_unlock(genpd); |
f721889f RW |
613 | } |
614 | ||
54eeddbf UH |
615 | /** |
616 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
617 | * @dev: Device to handle. | |
618 | */ | |
619 | static int __genpd_runtime_suspend(struct device *dev) | |
620 | { | |
621 | int (*cb)(struct device *__dev); | |
622 | ||
623 | if (dev->type && dev->type->pm) | |
624 | cb = dev->type->pm->runtime_suspend; | |
625 | else if (dev->class && dev->class->pm) | |
626 | cb = dev->class->pm->runtime_suspend; | |
627 | else if (dev->bus && dev->bus->pm) | |
628 | cb = dev->bus->pm->runtime_suspend; | |
629 | else | |
630 | cb = NULL; | |
631 | ||
632 | if (!cb && dev->driver && dev->driver->pm) | |
633 | cb = dev->driver->pm->runtime_suspend; | |
634 | ||
635 | return cb ? cb(dev) : 0; | |
636 | } | |
637 | ||
638 | /** | |
639 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
640 | * @dev: Device to handle. | |
641 | */ | |
642 | static int __genpd_runtime_resume(struct device *dev) | |
643 | { | |
644 | int (*cb)(struct device *__dev); | |
645 | ||
646 | if (dev->type && dev->type->pm) | |
647 | cb = dev->type->pm->runtime_resume; | |
648 | else if (dev->class && dev->class->pm) | |
649 | cb = dev->class->pm->runtime_resume; | |
650 | else if (dev->bus && dev->bus->pm) | |
651 | cb = dev->bus->pm->runtime_resume; | |
652 | else | |
653 | cb = NULL; | |
654 | ||
655 | if (!cb && dev->driver && dev->driver->pm) | |
656 | cb = dev->driver->pm->runtime_resume; | |
657 | ||
658 | return cb ? cb(dev) : 0; | |
659 | } | |
660 | ||
f721889f | 661 | /** |
795bd2e7 | 662 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
663 | * @dev: Device to suspend. |
664 | * | |
665 | * Carry out a runtime suspend of a device under the assumption that its | |
666 | * pm_domain field points to the domain member of an object of type | |
667 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
668 | */ | |
795bd2e7 | 669 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
670 | { |
671 | struct generic_pm_domain *genpd; | |
9df3921e | 672 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 673 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 674 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
675 | ktime_t time_start; |
676 | s64 elapsed_ns; | |
d5e4cbfe | 677 | int ret; |
f721889f RW |
678 | |
679 | dev_dbg(dev, "%s()\n", __func__); | |
680 | ||
5248051b RW |
681 | genpd = dev_to_genpd(dev); |
682 | if (IS_ERR(genpd)) | |
f721889f RW |
683 | return -EINVAL; |
684 | ||
ffe12855 UH |
685 | /* |
686 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
687 | * callbacks for other purposes than runtime PM. In those scenarios | |
688 | * runtime PM is disabled. Under these circumstances, we shall skip | |
689 | * validating/measuring the PM QoS latency. | |
690 | */ | |
9df3921e UH |
691 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
692 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
693 | return -EBUSY; |
694 | ||
2b1d88cd | 695 | /* Measure suspend latency. */ |
d33d5a6c | 696 | time_start = 0; |
ffe12855 UH |
697 | if (runtime_pm) |
698 | time_start = ktime_get(); | |
2b1d88cd | 699 | |
54eeddbf | 700 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
701 | if (ret) |
702 | return ret; | |
17b75eca | 703 | |
2b1d88cd | 704 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 705 | if (ret) { |
54eeddbf | 706 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
707 | return ret; |
708 | } | |
709 | ||
2b1d88cd | 710 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
711 | if (runtime_pm) { |
712 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
713 | if (elapsed_ns > td->suspend_latency_ns) { | |
714 | td->suspend_latency_ns = elapsed_ns; | |
715 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
716 | elapsed_ns); | |
717 | genpd->max_off_time_changed = true; | |
718 | td->constraint_changed = true; | |
719 | } | |
2b1d88cd UH |
720 | } |
721 | ||
0aa2a221 | 722 | /* |
d716f479 LI |
723 | * If power.irq_safe is set, this routine may be run with |
724 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 725 | */ |
d716f479 | 726 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
727 | return 0; |
728 | ||
35241d12 | 729 | genpd_lock(genpd); |
2da83545 | 730 | genpd_power_off(genpd, true, 0); |
35241d12 | 731 | genpd_unlock(genpd); |
f721889f RW |
732 | |
733 | return 0; | |
734 | } | |
735 | ||
f721889f | 736 | /** |
795bd2e7 | 737 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
738 | * @dev: Device to resume. |
739 | * | |
740 | * Carry out a runtime resume of a device under the assumption that its | |
741 | * pm_domain field points to the domain member of an object of type | |
742 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
743 | */ | |
795bd2e7 | 744 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
745 | { |
746 | struct generic_pm_domain *genpd; | |
2b1d88cd | 747 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 748 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
749 | ktime_t time_start; |
750 | s64 elapsed_ns; | |
f721889f | 751 | int ret; |
ba2bbfbf | 752 | bool timed = true; |
f721889f RW |
753 | |
754 | dev_dbg(dev, "%s()\n", __func__); | |
755 | ||
5248051b RW |
756 | genpd = dev_to_genpd(dev); |
757 | if (IS_ERR(genpd)) | |
f721889f RW |
758 | return -EINVAL; |
759 | ||
d716f479 LI |
760 | /* |
761 | * As we don't power off a non IRQ safe domain, which holds | |
762 | * an IRQ safe device, we don't need to restore power to it. | |
763 | */ | |
764 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
765 | timed = false; |
766 | goto out; | |
767 | } | |
0aa2a221 | 768 | |
35241d12 | 769 | genpd_lock(genpd); |
86e12eac | 770 | ret = genpd_power_on(genpd, 0); |
35241d12 | 771 | genpd_unlock(genpd); |
c6d22b37 | 772 | |
ba2bbfbf UH |
773 | if (ret) |
774 | return ret; | |
c6d22b37 | 775 | |
ba2bbfbf | 776 | out: |
2b1d88cd | 777 | /* Measure resume latency. */ |
ab51e6ba | 778 | time_start = 0; |
ffe12855 | 779 | if (timed && runtime_pm) |
2b1d88cd UH |
780 | time_start = ktime_get(); |
781 | ||
076395ca LP |
782 | ret = genpd_start_dev(genpd, dev); |
783 | if (ret) | |
784 | goto err_poweroff; | |
785 | ||
54eeddbf | 786 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
787 | if (ret) |
788 | goto err_stop; | |
2b1d88cd UH |
789 | |
790 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 791 | if (timed && runtime_pm) { |
2b1d88cd UH |
792 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
793 | if (elapsed_ns > td->resume_latency_ns) { | |
794 | td->resume_latency_ns = elapsed_ns; | |
795 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
796 | elapsed_ns); | |
797 | genpd->max_off_time_changed = true; | |
798 | td->constraint_changed = true; | |
799 | } | |
800 | } | |
17b75eca | 801 | |
f721889f | 802 | return 0; |
076395ca LP |
803 | |
804 | err_stop: | |
805 | genpd_stop_dev(genpd, dev); | |
806 | err_poweroff: | |
d716f479 LI |
807 | if (!pm_runtime_is_irq_safe(dev) || |
808 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 809 | genpd_lock(genpd); |
2da83545 | 810 | genpd_power_off(genpd, true, 0); |
35241d12 | 811 | genpd_unlock(genpd); |
076395ca LP |
812 | } |
813 | ||
814 | return ret; | |
f721889f RW |
815 | } |
816 | ||
39ac5ba5 TB |
817 | static bool pd_ignore_unused; |
818 | static int __init pd_ignore_unused_setup(char *__unused) | |
819 | { | |
820 | pd_ignore_unused = true; | |
821 | return 1; | |
822 | } | |
823 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
824 | ||
17f2ae7f | 825 | /** |
86e12eac | 826 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 827 | */ |
86e12eac | 828 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
829 | { |
830 | struct generic_pm_domain *genpd; | |
831 | ||
39ac5ba5 TB |
832 | if (pd_ignore_unused) { |
833 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 834 | return 0; |
39ac5ba5 TB |
835 | } |
836 | ||
17f2ae7f RW |
837 | mutex_lock(&gpd_list_lock); |
838 | ||
839 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
840 | genpd_queue_power_off_work(genpd); | |
841 | ||
842 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 843 | |
2fe71dcd UH |
844 | return 0; |
845 | } | |
86e12eac | 846 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 847 | |
0159ec67 | 848 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 849 | |
9e9704ea | 850 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 851 | { |
895b31f3 | 852 | const struct generic_pm_domain *gpd; |
77f827de RW |
853 | |
854 | if (IS_ERR_OR_NULL(genpd)) | |
855 | return false; | |
856 | ||
857 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
858 | if (gpd == genpd) | |
859 | return true; | |
860 | ||
861 | return false; | |
862 | } | |
863 | ||
0159ec67 JH |
864 | #endif |
865 | ||
866 | #ifdef CONFIG_PM_SLEEP | |
867 | ||
d8600c8b | 868 | static bool genpd_dev_active_wakeup(const struct generic_pm_domain *genpd, |
d5e4cbfe RW |
869 | struct device *dev) |
870 | { | |
871 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
872 | } | |
873 | ||
596ba34b | 874 | /** |
86e12eac | 875 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 876 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
877 | * @use_lock: use the lock. |
878 | * @depth: nesting count for lockdep. | |
596ba34b RW |
879 | * |
880 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 881 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 882 | * |
77f827de | 883 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
884 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
885 | * these cases the lock must be held. | |
596ba34b | 886 | */ |
0883ac03 UH |
887 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
888 | unsigned int depth) | |
596ba34b | 889 | { |
5063ce15 | 890 | struct gpd_link *link; |
596ba34b | 891 | |
ffaa42e8 | 892 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
893 | return; |
894 | ||
c4bb3160 RW |
895 | if (genpd->suspended_count != genpd->device_count |
896 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
897 | return; |
898 | ||
fc5cbf0c AH |
899 | /* Choose the deepest state when suspending */ |
900 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
901 | if (_genpd_power_off(genpd, false)) |
902 | return; | |
596ba34b | 903 | |
17b75eca | 904 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
905 | |
906 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
907 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
908 | |
909 | if (use_lock) | |
910 | genpd_lock_nested(link->master, depth + 1); | |
911 | ||
912 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
913 | ||
914 | if (use_lock) | |
915 | genpd_unlock(link->master); | |
596ba34b RW |
916 | } |
917 | } | |
918 | ||
802d8b49 | 919 | /** |
86e12eac | 920 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 921 | * @genpd: PM domain to power on. |
0883ac03 UH |
922 | * @use_lock: use the lock. |
923 | * @depth: nesting count for lockdep. | |
802d8b49 | 924 | * |
77f827de | 925 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
926 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
927 | * these cases the lock must be held. | |
802d8b49 | 928 | */ |
0883ac03 UH |
929 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
930 | unsigned int depth) | |
802d8b49 RW |
931 | { |
932 | struct gpd_link *link; | |
933 | ||
41e2c8e0 | 934 | if (genpd_status_on(genpd)) |
802d8b49 RW |
935 | return; |
936 | ||
937 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 938 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
939 | |
940 | if (use_lock) | |
941 | genpd_lock_nested(link->master, depth + 1); | |
942 | ||
943 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
944 | ||
945 | if (use_lock) | |
946 | genpd_unlock(link->master); | |
802d8b49 RW |
947 | } |
948 | ||
86e12eac | 949 | _genpd_power_on(genpd, false); |
802d8b49 RW |
950 | |
951 | genpd->status = GPD_STATE_ACTIVE; | |
952 | } | |
953 | ||
4ecd6e65 RW |
954 | /** |
955 | * resume_needed - Check whether to resume a device before system suspend. | |
956 | * @dev: Device to check. | |
957 | * @genpd: PM domain the device belongs to. | |
958 | * | |
959 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 960 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
961 | * to wake up the system and it has to remain active for this purpose while the |
962 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
963 | * the system from sleep states and it generally doesn't generate wakeup signals | |
964 | * by itself (those signals are generated on its behalf by other parts of the | |
965 | * system). In the latter case it may be necessary to reconfigure the device's | |
966 | * wakeup settings during system suspend, because it may have been set up to | |
967 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
968 | * Return 'true' in either of the above cases. | |
969 | */ | |
d8600c8b KK |
970 | static bool resume_needed(struct device *dev, |
971 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
972 | { |
973 | bool active_wakeup; | |
974 | ||
975 | if (!device_can_wakeup(dev)) | |
976 | return false; | |
977 | ||
d5e4cbfe | 978 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
979 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
980 | } | |
981 | ||
596ba34b | 982 | /** |
9e9704ea | 983 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
984 | * @dev: Device to start the transition of. |
985 | * | |
986 | * Start a power transition of a device (during a system-wide power transition) | |
987 | * under the assumption that its pm_domain field points to the domain member of | |
988 | * an object of type struct generic_pm_domain representing a PM domain | |
989 | * consisting of I/O devices. | |
990 | */ | |
9e9704ea | 991 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
992 | { |
993 | struct generic_pm_domain *genpd; | |
b6c10c84 | 994 | int ret; |
596ba34b RW |
995 | |
996 | dev_dbg(dev, "%s()\n", __func__); | |
997 | ||
998 | genpd = dev_to_genpd(dev); | |
999 | if (IS_ERR(genpd)) | |
1000 | return -EINVAL; | |
1001 | ||
17b75eca RW |
1002 | /* |
1003 | * If a wakeup request is pending for the device, it should be woken up | |
1004 | * at this point and a system wakeup event should be reported if it's | |
1005 | * set up to wake up the system from sleep states. | |
1006 | */ | |
4ecd6e65 RW |
1007 | if (resume_needed(dev, genpd)) |
1008 | pm_runtime_resume(dev); | |
1009 | ||
35241d12 | 1010 | genpd_lock(genpd); |
596ba34b | 1011 | |
39dd0f23 | 1012 | if (genpd->prepared_count++ == 0) |
65533bbf | 1013 | genpd->suspended_count = 0; |
17b75eca | 1014 | |
35241d12 | 1015 | genpd_unlock(genpd); |
596ba34b | 1016 | |
b6c10c84 RW |
1017 | ret = pm_generic_prepare(dev); |
1018 | if (ret) { | |
35241d12 | 1019 | genpd_lock(genpd); |
b6c10c84 | 1020 | |
39dd0f23 | 1021 | genpd->prepared_count--; |
b6c10c84 | 1022 | |
35241d12 | 1023 | genpd_unlock(genpd); |
b6c10c84 | 1024 | } |
17b75eca | 1025 | |
b6c10c84 | 1026 | return ret; |
596ba34b RW |
1027 | } |
1028 | ||
0496c8ae | 1029 | /** |
10da6542 MP |
1030 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1031 | * I/O pm domain. | |
0496c8ae | 1032 | * @dev: Device to suspend. |
10da6542 | 1033 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1034 | * |
1035 | * Stop the device and remove power from the domain if all devices in it have | |
1036 | * been stopped. | |
1037 | */ | |
10da6542 | 1038 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1039 | { |
1040 | struct generic_pm_domain *genpd; | |
122a2237 | 1041 | int ret; |
0496c8ae | 1042 | |
0496c8ae RW |
1043 | genpd = dev_to_genpd(dev); |
1044 | if (IS_ERR(genpd)) | |
1045 | return -EINVAL; | |
596ba34b | 1046 | |
39dd0f23 | 1047 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
d4f2d87a RW |
1048 | return 0; |
1049 | ||
10da6542 MP |
1050 | if (poweroff) |
1051 | ret = pm_generic_poweroff_noirq(dev); | |
1052 | else | |
1053 | ret = pm_generic_suspend_noirq(dev); | |
1054 | if (ret) | |
1055 | return ret; | |
1056 | ||
122a2237 UH |
1057 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
1058 | ret = pm_runtime_force_suspend(dev); | |
1059 | if (ret) | |
1060 | return ret; | |
1061 | } | |
1062 | ||
0883ac03 | 1063 | genpd_lock(genpd); |
596ba34b | 1064 | genpd->suspended_count++; |
0883ac03 UH |
1065 | genpd_sync_power_off(genpd, true, 0); |
1066 | genpd_unlock(genpd); | |
596ba34b RW |
1067 | |
1068 | return 0; | |
1069 | } | |
1070 | ||
10da6542 | 1071 | /** |
9e9704ea | 1072 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1073 | * @dev: Device to suspend. |
1074 | * | |
1075 | * Stop the device and remove power from the domain if all devices in it have | |
1076 | * been stopped. | |
1077 | */ | |
9e9704ea | 1078 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1079 | { |
1080 | dev_dbg(dev, "%s()\n", __func__); | |
1081 | ||
1082 | return genpd_finish_suspend(dev, false); | |
1083 | } | |
1084 | ||
596ba34b | 1085 | /** |
9e9704ea | 1086 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1087 | * @dev: Device to resume. |
1088 | * | |
0496c8ae | 1089 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1090 | */ |
9e9704ea | 1091 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1092 | { |
1093 | struct generic_pm_domain *genpd; | |
122a2237 | 1094 | int ret = 0; |
596ba34b RW |
1095 | |
1096 | dev_dbg(dev, "%s()\n", __func__); | |
1097 | ||
1098 | genpd = dev_to_genpd(dev); | |
1099 | if (IS_ERR(genpd)) | |
1100 | return -EINVAL; | |
1101 | ||
39dd0f23 | 1102 | if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)) |
596ba34b RW |
1103 | return 0; |
1104 | ||
0883ac03 UH |
1105 | genpd_lock(genpd); |
1106 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1107 | genpd->suspended_count--; |
0883ac03 | 1108 | genpd_unlock(genpd); |
596ba34b | 1109 | |
122a2237 UH |
1110 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1111 | ret = pm_runtime_force_resume(dev); | |
1112 | ||
10da6542 MP |
1113 | ret = pm_generic_resume_noirq(dev); |
1114 | if (ret) | |
1115 | return ret; | |
1116 | ||
122a2237 | 1117 | return ret; |
596ba34b RW |
1118 | } |
1119 | ||
0496c8ae | 1120 | /** |
9e9704ea | 1121 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1122 | * @dev: Device to freeze. |
1123 | * | |
1124 | * Carry out a late freeze of a device under the assumption that its | |
1125 | * pm_domain field points to the domain member of an object of type | |
1126 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1127 | * devices. | |
1128 | */ | |
9e9704ea | 1129 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1130 | { |
d8600c8b | 1131 | const struct generic_pm_domain *genpd; |
122a2237 | 1132 | int ret = 0; |
596ba34b RW |
1133 | |
1134 | dev_dbg(dev, "%s()\n", __func__); | |
1135 | ||
1136 | genpd = dev_to_genpd(dev); | |
1137 | if (IS_ERR(genpd)) | |
1138 | return -EINVAL; | |
1139 | ||
10da6542 MP |
1140 | ret = pm_generic_freeze_noirq(dev); |
1141 | if (ret) | |
1142 | return ret; | |
1143 | ||
122a2237 UH |
1144 | if (genpd->dev_ops.stop && genpd->dev_ops.start) |
1145 | ret = pm_runtime_force_suspend(dev); | |
1146 | ||
1147 | return ret; | |
0496c8ae | 1148 | } |
596ba34b | 1149 | |
0496c8ae | 1150 | /** |
9e9704ea | 1151 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1152 | * @dev: Device to thaw. |
1153 | * | |
1154 | * Start the device, unless power has been removed from the domain already | |
1155 | * before the system transition. | |
1156 | */ | |
9e9704ea | 1157 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1158 | { |
d8600c8b | 1159 | const struct generic_pm_domain *genpd; |
122a2237 | 1160 | int ret = 0; |
596ba34b | 1161 | |
0496c8ae | 1162 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1163 | |
0496c8ae RW |
1164 | genpd = dev_to_genpd(dev); |
1165 | if (IS_ERR(genpd)) | |
1166 | return -EINVAL; | |
1167 | ||
10da6542 | 1168 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
122a2237 | 1169 | ret = pm_runtime_force_resume(dev); |
10da6542 MP |
1170 | if (ret) |
1171 | return ret; | |
1172 | } | |
122a2237 | 1173 | |
10da6542 MP |
1174 | return pm_generic_thaw_noirq(dev); |
1175 | } | |
1176 | ||
1177 | /** | |
9e9704ea | 1178 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1179 | * I/O PM domain. |
1180 | * @dev: Device to poweroff. | |
1181 | * | |
1182 | * Stop the device and remove power from the domain if all devices in it have | |
1183 | * been stopped. | |
1184 | */ | |
9e9704ea | 1185 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1186 | { |
1187 | dev_dbg(dev, "%s()\n", __func__); | |
1188 | ||
1189 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1190 | } |
1191 | ||
596ba34b | 1192 | /** |
9e9704ea | 1193 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1194 | * @dev: Device to resume. |
1195 | * | |
0496c8ae RW |
1196 | * Make sure the domain will be in the same power state as before the |
1197 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1198 | */ |
9e9704ea | 1199 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1200 | { |
1201 | struct generic_pm_domain *genpd; | |
122a2237 | 1202 | int ret = 0; |
596ba34b RW |
1203 | |
1204 | dev_dbg(dev, "%s()\n", __func__); | |
1205 | ||
1206 | genpd = dev_to_genpd(dev); | |
1207 | if (IS_ERR(genpd)) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | /* | |
65533bbf RW |
1211 | * At this point suspended_count == 0 means we are being run for the |
1212 | * first time for the given domain in the present cycle. | |
596ba34b | 1213 | */ |
0883ac03 | 1214 | genpd_lock(genpd); |
39dd0f23 | 1215 | if (genpd->suspended_count++ == 0) |
596ba34b | 1216 | /* |
65533bbf | 1217 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1218 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1219 | * so that it tries to power it on in case it was really off. |
596ba34b | 1220 | */ |
65533bbf | 1221 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1222 | |
0883ac03 UH |
1223 | genpd_sync_power_on(genpd, true, 0); |
1224 | genpd_unlock(genpd); | |
596ba34b | 1225 | |
10da6542 | 1226 | if (genpd->dev_ops.stop && genpd->dev_ops.start) { |
122a2237 | 1227 | ret = pm_runtime_force_resume(dev); |
10da6542 MP |
1228 | if (ret) |
1229 | return ret; | |
1230 | } | |
122a2237 | 1231 | |
10da6542 | 1232 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1233 | } |
1234 | ||
1235 | /** | |
9e9704ea | 1236 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1237 | * @dev: Device to complete the transition of. |
1238 | * | |
1239 | * Complete a power transition of a device (during a system-wide power | |
1240 | * transition) under the assumption that its pm_domain field points to the | |
1241 | * domain member of an object of type struct generic_pm_domain representing | |
1242 | * a power domain consisting of I/O devices. | |
1243 | */ | |
9e9704ea | 1244 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1245 | { |
1246 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1247 | |
1248 | dev_dbg(dev, "%s()\n", __func__); | |
1249 | ||
1250 | genpd = dev_to_genpd(dev); | |
1251 | if (IS_ERR(genpd)) | |
1252 | return; | |
1253 | ||
4d23a5e8 UH |
1254 | pm_generic_complete(dev); |
1255 | ||
35241d12 | 1256 | genpd_lock(genpd); |
596ba34b | 1257 | |
39dd0f23 | 1258 | genpd->prepared_count--; |
4d23a5e8 UH |
1259 | if (!genpd->prepared_count) |
1260 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1261 | |
35241d12 | 1262 | genpd_unlock(genpd); |
596ba34b RW |
1263 | } |
1264 | ||
77f827de | 1265 | /** |
d47e6464 | 1266 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1267 | * @dev: Device that normally is marked as "always on" to switch power for. |
1268 | * | |
1269 | * This routine may only be called during the system core (syscore) suspend or | |
1270 | * resume phase for devices whose "always on" flags are set. | |
1271 | */ | |
d47e6464 | 1272 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1273 | { |
1274 | struct generic_pm_domain *genpd; | |
1275 | ||
23c6d2c7 | 1276 | genpd = dev_to_genpd(dev); |
9e9704ea | 1277 | if (!genpd_present(genpd)) |
77f827de RW |
1278 | return; |
1279 | ||
1280 | if (suspend) { | |
1281 | genpd->suspended_count++; | |
0883ac03 | 1282 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1283 | } else { |
0883ac03 | 1284 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1285 | genpd->suspended_count--; |
1286 | } | |
1287 | } | |
d47e6464 UH |
1288 | |
1289 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1290 | { | |
1291 | genpd_syscore_switch(dev, true); | |
1292 | } | |
1293 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1294 | ||
1295 | void pm_genpd_syscore_poweron(struct device *dev) | |
1296 | { | |
1297 | genpd_syscore_switch(dev, false); | |
1298 | } | |
1299 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1300 | |
d30d819d | 1301 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1302 | |
9e9704ea UH |
1303 | #define genpd_prepare NULL |
1304 | #define genpd_suspend_noirq NULL | |
1305 | #define genpd_resume_noirq NULL | |
1306 | #define genpd_freeze_noirq NULL | |
1307 | #define genpd_thaw_noirq NULL | |
1308 | #define genpd_poweroff_noirq NULL | |
1309 | #define genpd_restore_noirq NULL | |
1310 | #define genpd_complete NULL | |
596ba34b RW |
1311 | |
1312 | #endif /* CONFIG_PM_SLEEP */ | |
1313 | ||
f104e1e5 UH |
1314 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1315 | struct generic_pm_domain *genpd, | |
1316 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1317 | { |
1318 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1319 | int ret; |
1320 | ||
1321 | ret = dev_pm_get_subsys_data(dev); | |
1322 | if (ret) | |
1323 | return ERR_PTR(ret); | |
1d5fcfec RW |
1324 | |
1325 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1326 | if (!gpd_data) { |
1327 | ret = -ENOMEM; | |
1328 | goto err_put; | |
1329 | } | |
1d5fcfec | 1330 | |
f104e1e5 UH |
1331 | if (td) |
1332 | gpd_data->td = *td; | |
1333 | ||
1334 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1335 | gpd_data->td.constraint_changed = true; |
1336 | gpd_data->td.effective_constraint_ns = -1; | |
1337 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1338 | ||
1339 | spin_lock_irq(&dev->power.lock); | |
1340 | ||
1341 | if (dev->power.subsys_data->domain_data) { | |
1342 | ret = -EINVAL; | |
1343 | goto err_free; | |
1344 | } | |
1345 | ||
1346 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1347 | |
1348 | spin_unlock_irq(&dev->power.lock); | |
1349 | ||
1d5fcfec | 1350 | return gpd_data; |
3e235685 | 1351 | |
f104e1e5 UH |
1352 | err_free: |
1353 | spin_unlock_irq(&dev->power.lock); | |
1354 | kfree(gpd_data); | |
3e235685 UH |
1355 | err_put: |
1356 | dev_pm_put_subsys_data(dev); | |
1357 | return ERR_PTR(ret); | |
1d5fcfec RW |
1358 | } |
1359 | ||
49d400c7 UH |
1360 | static void genpd_free_dev_data(struct device *dev, |
1361 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1362 | { |
f104e1e5 UH |
1363 | spin_lock_irq(&dev->power.lock); |
1364 | ||
f104e1e5 UH |
1365 | dev->power.subsys_data->domain_data = NULL; |
1366 | ||
1367 | spin_unlock_irq(&dev->power.lock); | |
1368 | ||
1d5fcfec | 1369 | kfree(gpd_data); |
3e235685 | 1370 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1371 | } |
1372 | ||
19efa5ff JH |
1373 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1374 | struct gpd_timing_data *td) | |
f721889f | 1375 | { |
c0356db7 | 1376 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1377 | int ret = 0; |
1378 | ||
1379 | dev_dbg(dev, "%s()\n", __func__); | |
1380 | ||
1381 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1382 | return -EINVAL; | |
1383 | ||
f104e1e5 | 1384 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1385 | if (IS_ERR(gpd_data)) |
1386 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1387 | |
35241d12 | 1388 | genpd_lock(genpd); |
f721889f | 1389 | |
596ba34b RW |
1390 | if (genpd->prepared_count > 0) { |
1391 | ret = -EAGAIN; | |
1392 | goto out; | |
1393 | } | |
1394 | ||
b472c2fa UH |
1395 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1396 | if (ret) | |
1397 | goto out; | |
d79b6fe1 | 1398 | |
975e83cf SH |
1399 | dev_pm_domain_set(dev, &genpd->domain); |
1400 | ||
14b53064 UH |
1401 | genpd->device_count++; |
1402 | genpd->max_off_time_changed = true; | |
1403 | ||
1d5fcfec | 1404 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1405 | |
f721889f | 1406 | out: |
35241d12 | 1407 | genpd_unlock(genpd); |
f721889f | 1408 | |
c0356db7 UH |
1409 | if (ret) |
1410 | genpd_free_dev_data(dev, gpd_data); | |
1411 | else | |
1412 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1413 | |
f721889f RW |
1414 | return ret; |
1415 | } | |
19efa5ff JH |
1416 | |
1417 | /** | |
1418 | * __pm_genpd_add_device - Add a device to an I/O PM domain. | |
1419 | * @genpd: PM domain to add the device to. | |
1420 | * @dev: Device to be added. | |
1421 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1422 | */ | |
1423 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, | |
1424 | struct gpd_timing_data *td) | |
1425 | { | |
1426 | int ret; | |
1427 | ||
1428 | mutex_lock(&gpd_list_lock); | |
1429 | ret = genpd_add_device(genpd, dev, td); | |
1430 | mutex_unlock(&gpd_list_lock); | |
1431 | ||
1432 | return ret; | |
1433 | } | |
24c96dc7 | 1434 | EXPORT_SYMBOL_GPL(__pm_genpd_add_device); |
f721889f | 1435 | |
85168d56 UH |
1436 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1437 | struct device *dev) | |
f721889f | 1438 | { |
6ff7bb0d | 1439 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1440 | struct pm_domain_data *pdd; |
efa69025 | 1441 | int ret = 0; |
f721889f RW |
1442 | |
1443 | dev_dbg(dev, "%s()\n", __func__); | |
1444 | ||
c0356db7 UH |
1445 | pdd = dev->power.subsys_data->domain_data; |
1446 | gpd_data = to_gpd_data(pdd); | |
1447 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1448 | ||
35241d12 | 1449 | genpd_lock(genpd); |
f721889f | 1450 | |
596ba34b RW |
1451 | if (genpd->prepared_count > 0) { |
1452 | ret = -EAGAIN; | |
1453 | goto out; | |
1454 | } | |
1455 | ||
6ff7bb0d RW |
1456 | genpd->device_count--; |
1457 | genpd->max_off_time_changed = true; | |
1458 | ||
d79b6fe1 | 1459 | if (genpd->detach_dev) |
c16561e8 | 1460 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1461 | |
975e83cf SH |
1462 | dev_pm_domain_set(dev, NULL); |
1463 | ||
efa69025 | 1464 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1465 | |
35241d12 | 1466 | genpd_unlock(genpd); |
6ff7bb0d | 1467 | |
c1dbe2fb | 1468 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1469 | |
6ff7bb0d | 1470 | return 0; |
f721889f | 1471 | |
596ba34b | 1472 | out: |
35241d12 | 1473 | genpd_unlock(genpd); |
c0356db7 | 1474 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1475 | |
1476 | return ret; | |
1477 | } | |
85168d56 UH |
1478 | |
1479 | /** | |
1480 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1481 | * @genpd: PM domain to remove the device from. | |
1482 | * @dev: Device to be removed. | |
1483 | */ | |
1484 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1485 | struct device *dev) | |
1486 | { | |
1487 | if (!genpd || genpd != genpd_lookup_dev(dev)) | |
1488 | return -EINVAL; | |
1489 | ||
1490 | return genpd_remove_device(genpd, dev); | |
1491 | } | |
24c96dc7 | 1492 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1493 | |
19efa5ff JH |
1494 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1495 | struct generic_pm_domain *subdomain) | |
f721889f | 1496 | { |
2547923d | 1497 | struct gpd_link *link, *itr; |
f721889f RW |
1498 | int ret = 0; |
1499 | ||
fb7268be RW |
1500 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1501 | || genpd == subdomain) | |
f721889f RW |
1502 | return -EINVAL; |
1503 | ||
d716f479 LI |
1504 | /* |
1505 | * If the domain can be powered on/off in an IRQ safe | |
1506 | * context, ensure that the subdomain can also be | |
1507 | * powered on/off in that context. | |
1508 | */ | |
1509 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1510 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1511 | genpd->name, subdomain->name); |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
2547923d LI |
1515 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1516 | if (!link) | |
1517 | return -ENOMEM; | |
1518 | ||
35241d12 LI |
1519 | genpd_lock(subdomain); |
1520 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1521 | |
41e2c8e0 | 1522 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1523 | ret = -EINVAL; |
1524 | goto out; | |
1525 | } | |
1526 | ||
2547923d LI |
1527 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1528 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1529 | ret = -EINVAL; |
1530 | goto out; | |
1531 | } | |
1532 | } | |
1533 | ||
5063ce15 RW |
1534 | link->master = genpd; |
1535 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1536 | link->slave = subdomain; |
1537 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1538 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1539 | genpd_sd_counter_inc(genpd); |
f721889f | 1540 | |
f721889f | 1541 | out: |
35241d12 LI |
1542 | genpd_unlock(genpd); |
1543 | genpd_unlock(subdomain); | |
2547923d LI |
1544 | if (ret) |
1545 | kfree(link); | |
f721889f RW |
1546 | return ret; |
1547 | } | |
19efa5ff JH |
1548 | |
1549 | /** | |
1550 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1551 | * @genpd: Master PM domain to add the subdomain to. | |
1552 | * @subdomain: Subdomain to be added. | |
1553 | */ | |
1554 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1555 | struct generic_pm_domain *subdomain) | |
1556 | { | |
1557 | int ret; | |
1558 | ||
1559 | mutex_lock(&gpd_list_lock); | |
1560 | ret = genpd_add_subdomain(genpd, subdomain); | |
1561 | mutex_unlock(&gpd_list_lock); | |
1562 | ||
1563 | return ret; | |
1564 | } | |
d60ee966 | 1565 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1566 | |
1567 | /** | |
1568 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1569 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1570 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1571 | */ |
1572 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1573 | struct generic_pm_domain *subdomain) |
f721889f | 1574 | { |
c6e83cac | 1575 | struct gpd_link *l, *link; |
f721889f RW |
1576 | int ret = -EINVAL; |
1577 | ||
5063ce15 | 1578 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1579 | return -EINVAL; |
1580 | ||
35241d12 LI |
1581 | genpd_lock(subdomain); |
1582 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1583 | |
beda5fc1 | 1584 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1585 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1586 | subdomain->name); | |
1587 | ret = -EBUSY; | |
1588 | goto out; | |
1589 | } | |
1590 | ||
c6e83cac | 1591 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1592 | if (link->slave != subdomain) |
f721889f RW |
1593 | continue; |
1594 | ||
5063ce15 RW |
1595 | list_del(&link->master_node); |
1596 | list_del(&link->slave_node); | |
1597 | kfree(link); | |
41e2c8e0 | 1598 | if (genpd_status_on(subdomain)) |
f721889f RW |
1599 | genpd_sd_counter_dec(genpd); |
1600 | ||
f721889f RW |
1601 | ret = 0; |
1602 | break; | |
1603 | } | |
1604 | ||
30e7a65b | 1605 | out: |
35241d12 LI |
1606 | genpd_unlock(genpd); |
1607 | genpd_unlock(subdomain); | |
f721889f RW |
1608 | |
1609 | return ret; | |
1610 | } | |
d60ee966 | 1611 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1612 | |
59d65b73 LI |
1613 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1614 | { | |
1615 | struct genpd_power_state *state; | |
1616 | ||
1617 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1618 | if (!state) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | genpd->states = state; | |
1622 | genpd->state_count = 1; | |
1623 | genpd->free = state; | |
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
d716f479 LI |
1628 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1629 | { | |
1630 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1631 | spin_lock_init(&genpd->slock); | |
1632 | genpd->lock_ops = &genpd_spin_ops; | |
1633 | } else { | |
1634 | mutex_init(&genpd->mlock); | |
1635 | genpd->lock_ops = &genpd_mtx_ops; | |
1636 | } | |
1637 | } | |
1638 | ||
f721889f RW |
1639 | /** |
1640 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1641 | * @genpd: PM domain object to initialize. | |
1642 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1643 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1644 | * |
1645 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1646 | */ |
7eb231c3 UH |
1647 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1648 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1649 | { |
59d65b73 LI |
1650 | int ret; |
1651 | ||
f721889f | 1652 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1653 | return -EINVAL; |
f721889f | 1654 | |
5063ce15 RW |
1655 | INIT_LIST_HEAD(&genpd->master_links); |
1656 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1657 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1658 | genpd_lock_init(genpd); |
f721889f RW |
1659 | genpd->gov = gov; |
1660 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1661 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1662 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1663 | genpd->device_count = 0; |
221e9b58 | 1664 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1665 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1666 | genpd->provider = NULL; |
1667 | genpd->has_provider = false; | |
afece3ab | 1668 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1669 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1670 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1671 | genpd->domain.ops.prepare = genpd_prepare; |
1672 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1673 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1674 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1675 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1676 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1677 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1678 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1679 | |
1680 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1681 | genpd->dev_ops.stop = pm_clk_suspend; | |
1682 | genpd->dev_ops.start = pm_clk_resume; | |
1683 | } | |
1684 | ||
ffaa42e8 UH |
1685 | /* Always-on domains must be powered on at initialization. */ |
1686 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1687 | return -EINVAL; | |
1688 | ||
fc5cbf0c | 1689 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1690 | if (genpd->state_count == 0) { |
1691 | ret = genpd_set_default_power_state(genpd); | |
1692 | if (ret) | |
1693 | return ret; | |
1694 | } | |
fc5cbf0c | 1695 | |
5125bbf3 RW |
1696 | mutex_lock(&gpd_list_lock); |
1697 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1698 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1699 | |
1700 | return 0; | |
5125bbf3 | 1701 | } |
be5ed55d | 1702 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1703 | |
3fe57710 JH |
1704 | static int genpd_remove(struct generic_pm_domain *genpd) |
1705 | { | |
1706 | struct gpd_link *l, *link; | |
1707 | ||
1708 | if (IS_ERR_OR_NULL(genpd)) | |
1709 | return -EINVAL; | |
1710 | ||
35241d12 | 1711 | genpd_lock(genpd); |
3fe57710 JH |
1712 | |
1713 | if (genpd->has_provider) { | |
35241d12 | 1714 | genpd_unlock(genpd); |
3fe57710 JH |
1715 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1716 | return -EBUSY; | |
1717 | } | |
1718 | ||
1719 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1720 | genpd_unlock(genpd); |
3fe57710 JH |
1721 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1722 | return -EBUSY; | |
1723 | } | |
1724 | ||
1725 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1726 | list_del(&link->master_node); | |
1727 | list_del(&link->slave_node); | |
1728 | kfree(link); | |
1729 | } | |
1730 | ||
1731 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1732 | genpd_unlock(genpd); |
3fe57710 | 1733 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1734 | kfree(genpd->free); |
3fe57710 JH |
1735 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1736 | ||
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1742 | * @genpd: Pointer to PM domain that is to be removed. | |
1743 | * | |
1744 | * To remove the PM domain, this function: | |
1745 | * - Removes the PM domain as a subdomain to any parent domains, | |
1746 | * if it was added. | |
1747 | * - Removes the PM domain from the list of registered PM domains. | |
1748 | * | |
1749 | * The PM domain will only be removed, if the associated provider has | |
1750 | * been removed, it is not a parent to any other PM domain and has no | |
1751 | * devices associated with it. | |
1752 | */ | |
1753 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1754 | { | |
1755 | int ret; | |
1756 | ||
1757 | mutex_lock(&gpd_list_lock); | |
1758 | ret = genpd_remove(genpd); | |
1759 | mutex_unlock(&gpd_list_lock); | |
1760 | ||
1761 | return ret; | |
1762 | } | |
1763 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1764 | ||
aa42240a | 1765 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1766 | |
aa42240a TF |
1767 | /* |
1768 | * Device Tree based PM domain providers. | |
1769 | * | |
1770 | * The code below implements generic device tree based PM domain providers that | |
1771 | * bind device tree nodes with generic PM domains registered in the system. | |
1772 | * | |
1773 | * Any driver that registers generic PM domains and needs to support binding of | |
1774 | * devices to these domains is supposed to register a PM domain provider, which | |
1775 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1776 | * | |
1777 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1778 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1779 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1780 | * index. |
1781 | */ | |
1782 | ||
1783 | /** | |
1784 | * struct of_genpd_provider - PM domain provider registration structure | |
1785 | * @link: Entry in global list of PM domain providers | |
1786 | * @node: Pointer to device tree node of PM domain provider | |
1787 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1788 | * into a PM domain. | |
1789 | * @data: context pointer to be passed into @xlate callback | |
1790 | */ | |
1791 | struct of_genpd_provider { | |
1792 | struct list_head link; | |
1793 | struct device_node *node; | |
1794 | genpd_xlate_t xlate; | |
1795 | void *data; | |
1796 | }; | |
1797 | ||
1798 | /* List of registered PM domain providers. */ | |
1799 | static LIST_HEAD(of_genpd_providers); | |
1800 | /* Mutex to protect the list above. */ | |
1801 | static DEFINE_MUTEX(of_genpd_mutex); | |
1802 | ||
1803 | /** | |
892ebdcc | 1804 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1805 | * @genpdspec: OF phandle args to map into a PM domain |
1806 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1807 | * | |
1808 | * This is a generic xlate function that can be used to model PM domains that | |
1809 | * have their own device tree nodes. The private data of xlate function needs | |
1810 | * to be a valid pointer to struct generic_pm_domain. | |
1811 | */ | |
892ebdcc | 1812 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1813 | struct of_phandle_args *genpdspec, |
1814 | void *data) | |
1815 | { | |
aa42240a TF |
1816 | return data; |
1817 | } | |
aa42240a TF |
1818 | |
1819 | /** | |
892ebdcc | 1820 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1821 | * @genpdspec: OF phandle args to map into a PM domain |
1822 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1823 | * | |
1824 | * This is a generic xlate function that can be used to model simple PM domain | |
1825 | * controllers that have one device tree node and provide multiple PM domains. | |
1826 | * A single cell is used as an index into an array of PM domains specified in | |
1827 | * the genpd_onecell_data struct when registering the provider. | |
1828 | */ | |
892ebdcc | 1829 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1830 | struct of_phandle_args *genpdspec, |
1831 | void *data) | |
1832 | { | |
1833 | struct genpd_onecell_data *genpd_data = data; | |
1834 | unsigned int idx = genpdspec->args[0]; | |
1835 | ||
1836 | if (genpdspec->args_count != 1) | |
1837 | return ERR_PTR(-EINVAL); | |
1838 | ||
1839 | if (idx >= genpd_data->num_domains) { | |
1840 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1841 | return ERR_PTR(-EINVAL); | |
1842 | } | |
1843 | ||
1844 | if (!genpd_data->domains[idx]) | |
1845 | return ERR_PTR(-ENOENT); | |
1846 | ||
1847 | return genpd_data->domains[idx]; | |
1848 | } | |
aa42240a TF |
1849 | |
1850 | /** | |
892ebdcc | 1851 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1852 | * @np: Device node pointer associated with the PM domain provider. |
1853 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1854 | * @data: Context pointer for @xlate callback. | |
1855 | */ | |
892ebdcc JH |
1856 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1857 | void *data) | |
aa42240a TF |
1858 | { |
1859 | struct of_genpd_provider *cp; | |
1860 | ||
1861 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1862 | if (!cp) | |
1863 | return -ENOMEM; | |
1864 | ||
1865 | cp->node = of_node_get(np); | |
1866 | cp->data = data; | |
1867 | cp->xlate = xlate; | |
1868 | ||
1869 | mutex_lock(&of_genpd_mutex); | |
1870 | list_add(&cp->link, &of_genpd_providers); | |
1871 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1872 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1873 | |
1874 | return 0; | |
1875 | } | |
892ebdcc JH |
1876 | |
1877 | /** | |
1878 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1879 | * @np: Device node pointer associated with the PM domain provider. | |
1880 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1881 | */ | |
1882 | int of_genpd_add_provider_simple(struct device_node *np, | |
1883 | struct generic_pm_domain *genpd) | |
1884 | { | |
0159ec67 JH |
1885 | int ret = -EINVAL; |
1886 | ||
1887 | if (!np || !genpd) | |
1888 | return -EINVAL; | |
1889 | ||
1890 | mutex_lock(&gpd_list_lock); | |
1891 | ||
9e9704ea | 1892 | if (genpd_present(genpd)) { |
0159ec67 | 1893 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
8ce95844 VK |
1894 | if (!ret) { |
1895 | genpd->provider = &np->fwnode; | |
1896 | genpd->has_provider = true; | |
1897 | } | |
de0aa06d JH |
1898 | } |
1899 | ||
0159ec67 JH |
1900 | mutex_unlock(&gpd_list_lock); |
1901 | ||
1902 | return ret; | |
892ebdcc JH |
1903 | } |
1904 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1905 | ||
1906 | /** | |
1907 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1908 | * @np: Device node pointer associated with the PM domain provider. | |
1909 | * @data: Pointer to the data associated with the PM domain provider. | |
1910 | */ | |
1911 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1912 | struct genpd_onecell_data *data) | |
1913 | { | |
0159ec67 | 1914 | unsigned int i; |
de0aa06d | 1915 | int ret = -EINVAL; |
0159ec67 JH |
1916 | |
1917 | if (!np || !data) | |
1918 | return -EINVAL; | |
1919 | ||
1920 | mutex_lock(&gpd_list_lock); | |
1921 | ||
40845524 TR |
1922 | if (!data->xlate) |
1923 | data->xlate = genpd_xlate_onecell; | |
1924 | ||
0159ec67 | 1925 | for (i = 0; i < data->num_domains; i++) { |
609bed67 TV |
1926 | if (!data->domains[i]) |
1927 | continue; | |
9e9704ea | 1928 | if (!genpd_present(data->domains[i])) |
de0aa06d JH |
1929 | goto error; |
1930 | ||
1931 | data->domains[i]->provider = &np->fwnode; | |
1932 | data->domains[i]->has_provider = true; | |
0159ec67 JH |
1933 | } |
1934 | ||
40845524 | 1935 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
1936 | if (ret < 0) |
1937 | goto error; | |
1938 | ||
1939 | mutex_unlock(&gpd_list_lock); | |
1940 | ||
1941 | return 0; | |
1942 | ||
1943 | error: | |
1944 | while (i--) { | |
609bed67 TV |
1945 | if (!data->domains[i]) |
1946 | continue; | |
de0aa06d JH |
1947 | data->domains[i]->provider = NULL; |
1948 | data->domains[i]->has_provider = false; | |
1949 | } | |
0159ec67 JH |
1950 | |
1951 | mutex_unlock(&gpd_list_lock); | |
1952 | ||
1953 | return ret; | |
892ebdcc JH |
1954 | } |
1955 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1956 | |
1957 | /** | |
1958 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1959 | * @np: Device node pointer associated with the PM domain provider | |
1960 | */ | |
1961 | void of_genpd_del_provider(struct device_node *np) | |
1962 | { | |
b556b15d | 1963 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 1964 | struct generic_pm_domain *gpd; |
aa42240a | 1965 | |
de0aa06d | 1966 | mutex_lock(&gpd_list_lock); |
aa42240a | 1967 | mutex_lock(&of_genpd_mutex); |
b556b15d | 1968 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 1969 | if (cp->node == np) { |
de0aa06d JH |
1970 | /* |
1971 | * For each PM domain associated with the | |
1972 | * provider, set the 'has_provider' to false | |
1973 | * so that the PM domain can be safely removed. | |
1974 | */ | |
1975 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
1976 | if (gpd->provider == &np->fwnode) | |
1977 | gpd->has_provider = false; | |
1978 | ||
aa42240a TF |
1979 | list_del(&cp->link); |
1980 | of_node_put(cp->node); | |
1981 | kfree(cp); | |
1982 | break; | |
1983 | } | |
1984 | } | |
1985 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 1986 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
1987 | } |
1988 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1989 | ||
1990 | /** | |
f58d4e5a | 1991 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
1992 | * @genpdspec: OF phandle args to use for look-up |
1993 | * | |
1994 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1995 | * found, uses xlate function of the provider to map phandle args to a PM | |
1996 | * domain. | |
1997 | * | |
1998 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1999 | * on failure. | |
2000 | */ | |
f58d4e5a | 2001 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2002 | struct of_phandle_args *genpdspec) |
2003 | { | |
2004 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2005 | struct of_genpd_provider *provider; | |
2006 | ||
41795a8a JH |
2007 | if (!genpdspec) |
2008 | return ERR_PTR(-EINVAL); | |
2009 | ||
aa42240a TF |
2010 | mutex_lock(&of_genpd_mutex); |
2011 | ||
2012 | /* Check if we have such a provider in our array */ | |
2013 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2014 | if (provider->node == genpdspec->np) | |
2015 | genpd = provider->xlate(genpdspec, provider->data); | |
2016 | if (!IS_ERR(genpd)) | |
2017 | break; | |
2018 | } | |
2019 | ||
2020 | mutex_unlock(&of_genpd_mutex); | |
2021 | ||
2022 | return genpd; | |
2023 | } | |
2024 | ||
ec69572b JH |
2025 | /** |
2026 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2027 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2028 | * @dev: Device to be added. | |
2029 | * | |
2030 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2031 | * the device to the PM domain. Returns a negative error code on failure. | |
2032 | */ | |
2033 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2034 | { | |
2035 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2036 | int ret; |
2037 | ||
2038 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2039 | |
f58d4e5a | 2040 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2041 | if (IS_ERR(genpd)) { |
2042 | ret = PTR_ERR(genpd); | |
2043 | goto out; | |
2044 | } | |
2045 | ||
2046 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 2047 | |
19efa5ff JH |
2048 | out: |
2049 | mutex_unlock(&gpd_list_lock); | |
2050 | ||
2051 | return ret; | |
ec69572b JH |
2052 | } |
2053 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2054 | ||
2055 | /** | |
2056 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2057 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2058 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2059 | * | |
2060 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2061 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2062 | * negative error code on failure. | |
2063 | */ | |
2064 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2065 | struct of_phandle_args *subdomain_spec) | |
2066 | { | |
2067 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2068 | int ret; |
2069 | ||
2070 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2071 | |
f58d4e5a | 2072 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2073 | if (IS_ERR(parent)) { |
2074 | ret = PTR_ERR(parent); | |
2075 | goto out; | |
2076 | } | |
ec69572b | 2077 | |
f58d4e5a | 2078 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2079 | if (IS_ERR(subdomain)) { |
2080 | ret = PTR_ERR(subdomain); | |
2081 | goto out; | |
2082 | } | |
2083 | ||
2084 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2085 | |
19efa5ff JH |
2086 | out: |
2087 | mutex_unlock(&gpd_list_lock); | |
2088 | ||
2089 | return ret; | |
ec69572b JH |
2090 | } |
2091 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2092 | ||
17926551 JH |
2093 | /** |
2094 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2095 | * @provider: Pointer to device structure associated with provider | |
2096 | * | |
2097 | * Find the last PM domain that was added by a particular provider and | |
2098 | * remove this PM domain from the list of PM domains. The provider is | |
2099 | * identified by the 'provider' device structure that is passed. The PM | |
2100 | * domain will only be removed, if the provider associated with domain | |
2101 | * has been removed. | |
2102 | * | |
2103 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2104 | * ERR_PTR() on failure. | |
2105 | */ | |
2106 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2107 | { | |
a7e2d1bc | 2108 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2109 | int ret; |
2110 | ||
2111 | if (IS_ERR_OR_NULL(np)) | |
2112 | return ERR_PTR(-EINVAL); | |
2113 | ||
2114 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2115 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2116 | if (gpd->provider == &np->fwnode) { |
2117 | ret = genpd_remove(gpd); | |
2118 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2119 | break; | |
2120 | } | |
2121 | } | |
2122 | mutex_unlock(&gpd_list_lock); | |
2123 | ||
2124 | return genpd; | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2127 | ||
aa42240a TF |
2128 | /** |
2129 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2130 | * @dev: Device to detach. |
aa42240a TF |
2131 | * @power_off: Currently not used |
2132 | * | |
2133 | * Try to locate a corresponding generic PM domain, which the device was | |
2134 | * attached to previously. If such is found, the device is detached from it. | |
2135 | */ | |
2136 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2137 | { | |
446d999c | 2138 | struct generic_pm_domain *pd; |
93af5e93 | 2139 | unsigned int i; |
aa42240a TF |
2140 | int ret = 0; |
2141 | ||
85168d56 UH |
2142 | pd = dev_to_genpd(dev); |
2143 | if (IS_ERR(pd)) | |
aa42240a TF |
2144 | return; |
2145 | ||
2146 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2147 | ||
93af5e93 | 2148 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2149 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2150 | if (ret != -EAGAIN) |
2151 | break; | |
93af5e93 GU |
2152 | |
2153 | mdelay(i); | |
aa42240a TF |
2154 | cond_resched(); |
2155 | } | |
2156 | ||
2157 | if (ret < 0) { | |
2158 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2159 | pd->name, ret); | |
2160 | return; | |
2161 | } | |
2162 | ||
2163 | /* Check if PM domain can be powered off after removing this device. */ | |
2164 | genpd_queue_power_off_work(pd); | |
2165 | } | |
2166 | ||
632f7ce3 RK |
2167 | static void genpd_dev_pm_sync(struct device *dev) |
2168 | { | |
2169 | struct generic_pm_domain *pd; | |
2170 | ||
2171 | pd = dev_to_genpd(dev); | |
2172 | if (IS_ERR(pd)) | |
2173 | return; | |
2174 | ||
2175 | genpd_queue_power_off_work(pd); | |
2176 | } | |
2177 | ||
aa42240a TF |
2178 | /** |
2179 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2180 | * @dev: Device to attach. | |
2181 | * | |
2182 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2183 | * attaches the device to retrieved pm_domain ops. | |
2184 | * | |
2185 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
2186 | * backwards compatibility with existing DTBs. | |
2187 | * | |
311fa6ad JH |
2188 | * Returns 0 on successfully attached PM domain or negative error code. Note |
2189 | * that if a power-domain exists for the device, but it cannot be found or | |
2190 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
2191 | * probed and to re-try again later. | |
aa42240a TF |
2192 | */ |
2193 | int genpd_dev_pm_attach(struct device *dev) | |
2194 | { | |
2195 | struct of_phandle_args pd_args; | |
2196 | struct generic_pm_domain *pd; | |
93af5e93 | 2197 | unsigned int i; |
aa42240a TF |
2198 | int ret; |
2199 | ||
2200 | if (!dev->of_node) | |
2201 | return -ENODEV; | |
2202 | ||
2203 | if (dev->pm_domain) | |
2204 | return -EEXIST; | |
2205 | ||
2206 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
2207 | "#power-domain-cells", 0, &pd_args); | |
2208 | if (ret < 0) { | |
2209 | if (ret != -ENOENT) | |
2210 | return ret; | |
2211 | ||
2212 | /* | |
2213 | * Try legacy Samsung-specific bindings | |
2214 | * (for backwards compatibility of DT ABI) | |
2215 | */ | |
2216 | pd_args.args_count = 0; | |
2217 | pd_args.np = of_parse_phandle(dev->of_node, | |
2218 | "samsung,power-domain", 0); | |
2219 | if (!pd_args.np) | |
2220 | return -ENOENT; | |
2221 | } | |
2222 | ||
19efa5ff | 2223 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2224 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2225 | of_node_put(pd_args.np); |
aa42240a | 2226 | if (IS_ERR(pd)) { |
19efa5ff | 2227 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2228 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2229 | __func__, PTR_ERR(pd)); | |
311fa6ad | 2230 | return -EPROBE_DEFER; |
aa42240a TF |
2231 | } |
2232 | ||
2233 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2234 | ||
93af5e93 | 2235 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
19efa5ff | 2236 | ret = genpd_add_device(pd, dev, NULL); |
aa42240a TF |
2237 | if (ret != -EAGAIN) |
2238 | break; | |
93af5e93 GU |
2239 | |
2240 | mdelay(i); | |
aa42240a TF |
2241 | cond_resched(); |
2242 | } | |
19efa5ff | 2243 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2244 | |
2245 | if (ret < 0) { | |
34994692 GU |
2246 | if (ret != -EPROBE_DEFER) |
2247 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2248 | pd->name, ret); | |
311fa6ad | 2249 | goto out; |
aa42240a TF |
2250 | } |
2251 | ||
2252 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2253 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2254 | |
35241d12 | 2255 | genpd_lock(pd); |
86e12eac | 2256 | ret = genpd_power_on(pd, 0); |
35241d12 | 2257 | genpd_unlock(pd); |
311fa6ad JH |
2258 | out: |
2259 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2260 | } |
2261 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
30f60428 LI |
2262 | |
2263 | static const struct of_device_id idle_state_match[] = { | |
598da548 | 2264 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2265 | { } |
2266 | }; | |
2267 | ||
2268 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2269 | struct device_node *state_node) | |
2270 | { | |
2271 | int err; | |
2272 | u32 residency; | |
2273 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2274 | |
2275 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2276 | &entry_latency); | |
2277 | if (err) { | |
ea11e94b RH |
2278 | pr_debug(" * %pOF missing entry-latency-us property\n", |
2279 | state_node); | |
30f60428 LI |
2280 | return -EINVAL; |
2281 | } | |
2282 | ||
2283 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2284 | &exit_latency); | |
2285 | if (err) { | |
ea11e94b RH |
2286 | pr_debug(" * %pOF missing exit-latency-us property\n", |
2287 | state_node); | |
30f60428 LI |
2288 | return -EINVAL; |
2289 | } | |
2290 | ||
2291 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2292 | if (!err) | |
2293 | genpd_state->residency_ns = 1000 * residency; | |
2294 | ||
2295 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2296 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2297 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2298 | |
2299 | return 0; | |
2300 | } | |
2301 | ||
2302 | /** | |
2303 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2304 | * | |
2305 | * @dn: The genpd device node | |
2306 | * @states: The pointer to which the state array will be saved. | |
2307 | * @n: The count of elements in the array returned from this function. | |
2308 | * | |
2309 | * Returns the device states parsed from the OF node. The memory for the states | |
2310 | * is allocated by this function and is the responsibility of the caller to | |
2311 | * free the memory after use. | |
2312 | */ | |
2313 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2314 | struct genpd_power_state **states, int *n) | |
2315 | { | |
2316 | struct genpd_power_state *st; | |
2317 | struct device_node *np; | |
2318 | int i = 0; | |
2319 | int err, ret; | |
2320 | int count; | |
2321 | struct of_phandle_iterator it; | |
b539cc82 | 2322 | const struct of_device_id *match_id; |
30f60428 LI |
2323 | |
2324 | count = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
a1fee00d | 2325 | if (count <= 0) |
30f60428 LI |
2326 | return -EINVAL; |
2327 | ||
2328 | st = kcalloc(count, sizeof(*st), GFP_KERNEL); | |
2329 | if (!st) | |
2330 | return -ENOMEM; | |
2331 | ||
2332 | /* Loop over the phandles until all the requested entry is found */ | |
2333 | of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) { | |
2334 | np = it.node; | |
b539cc82 LI |
2335 | match_id = of_match_node(idle_state_match, np); |
2336 | if (!match_id) | |
2337 | continue; | |
30f60428 LI |
2338 | ret = genpd_parse_state(&st[i++], np); |
2339 | if (ret) { | |
2340 | pr_err | |
ea11e94b RH |
2341 | ("Parsing idle state node %pOF failed with err %d\n", |
2342 | np, ret); | |
30f60428 LI |
2343 | of_node_put(np); |
2344 | kfree(st); | |
2345 | return ret; | |
2346 | } | |
2347 | } | |
2348 | ||
b539cc82 LI |
2349 | *n = i; |
2350 | if (!i) | |
2351 | kfree(st); | |
2352 | else | |
2353 | *states = st; | |
30f60428 LI |
2354 | |
2355 | return 0; | |
2356 | } | |
2357 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2358 | ||
d30d819d | 2359 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2360 | |
2361 | ||
2362 | /*** debugfs support ***/ | |
2363 | ||
8b0510b5 | 2364 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2365 | #include <linux/pm.h> |
2366 | #include <linux/device.h> | |
2367 | #include <linux/debugfs.h> | |
2368 | #include <linux/seq_file.h> | |
2369 | #include <linux/init.h> | |
2370 | #include <linux/kobject.h> | |
9e9704ea | 2371 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2372 | |
2373 | /* | |
2374 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2375 | * from sysfs.c, so generalize it. |
2bd5306a | 2376 | */ |
2bd5306a MM |
2377 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2378 | { | |
2379 | static const char * const status_lookup[] = { | |
2380 | [RPM_ACTIVE] = "active", | |
2381 | [RPM_RESUMING] = "resuming", | |
2382 | [RPM_SUSPENDED] = "suspended", | |
2383 | [RPM_SUSPENDING] = "suspending" | |
2384 | }; | |
2385 | const char *p = ""; | |
2386 | ||
2387 | if (dev->power.runtime_error) | |
2388 | p = "error"; | |
2389 | else if (dev->power.disable_depth) | |
2390 | p = "unsupported"; | |
2391 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2392 | p = status_lookup[dev->power.runtime_status]; | |
2393 | else | |
2394 | WARN_ON(1); | |
2395 | ||
2396 | seq_puts(s, p); | |
2397 | } | |
2bd5306a | 2398 | |
9e9704ea UH |
2399 | static int genpd_summary_one(struct seq_file *s, |
2400 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2401 | { |
2402 | static const char * const status_lookup[] = { | |
2403 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2404 | [GPD_STATE_POWER_OFF] = "off" |
2405 | }; | |
2406 | struct pm_domain_data *pm_data; | |
2407 | const char *kobj_path; | |
2408 | struct gpd_link *link; | |
6954d432 | 2409 | char state[16]; |
2bd5306a MM |
2410 | int ret; |
2411 | ||
35241d12 | 2412 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2413 | if (ret) |
2414 | return -ERESTARTSYS; | |
2415 | ||
66a5ca4b | 2416 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2417 | goto exit; |
41e2c8e0 | 2418 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2419 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2420 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2421 | else |
6954d432 GU |
2422 | snprintf(state, sizeof(state), "%s", |
2423 | status_lookup[genpd->status]); | |
2424 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2425 | |
2426 | /* | |
2427 | * Modifications on the list require holding locks on both | |
2428 | * master and slave, so we are safe. | |
66a5ca4b | 2429 | * Also genpd->name is immutable. |
2bd5306a | 2430 | */ |
66a5ca4b | 2431 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2432 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2433 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2434 | seq_puts(s, ", "); |
2435 | } | |
2436 | ||
66a5ca4b | 2437 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2438 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2439 | genpd_is_irq_safe(genpd) ? | |
2440 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2441 | if (kobj_path == NULL) |
2442 | continue; | |
2443 | ||
2444 | seq_printf(s, "\n %-50s ", kobj_path); | |
2445 | rtpm_status_str(s, pm_data->dev); | |
2446 | kfree(kobj_path); | |
2447 | } | |
2448 | ||
2449 | seq_puts(s, "\n"); | |
2450 | exit: | |
35241d12 | 2451 | genpd_unlock(genpd); |
2bd5306a MM |
2452 | |
2453 | return 0; | |
2454 | } | |
2455 | ||
b6a1d093 | 2456 | static int genpd_summary_show(struct seq_file *s, void *data) |
2bd5306a | 2457 | { |
66a5ca4b | 2458 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2459 | int ret = 0; |
2460 | ||
15dec67a GU |
2461 | seq_puts(s, "domain status slaves\n"); |
2462 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2463 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2464 | ||
2465 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2466 | if (ret) | |
2467 | return -ERESTARTSYS; | |
2468 | ||
66a5ca4b | 2469 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2470 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2471 | if (ret) |
2472 | break; | |
2473 | } | |
2474 | mutex_unlock(&gpd_list_lock); | |
2475 | ||
2476 | return ret; | |
2477 | } | |
2478 | ||
b6a1d093 | 2479 | static int genpd_status_show(struct seq_file *s, void *data) |
2bd5306a | 2480 | { |
b6a1d093 TG |
2481 | static const char * const status_lookup[] = { |
2482 | [GPD_STATE_ACTIVE] = "on", | |
2483 | [GPD_STATE_POWER_OFF] = "off" | |
2484 | }; | |
2485 | ||
2486 | struct generic_pm_domain *genpd = s->private; | |
2487 | int ret = 0; | |
2488 | ||
2489 | ret = genpd_lock_interruptible(genpd); | |
2490 | if (ret) | |
2491 | return -ERESTARTSYS; | |
2492 | ||
2493 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2494 | goto exit; | |
2495 | ||
2496 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2497 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2498 | genpd->state_idx); | |
2499 | else | |
2500 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2501 | exit: | |
2502 | genpd_unlock(genpd); | |
2503 | return ret; | |
2bd5306a MM |
2504 | } |
2505 | ||
b6a1d093 TG |
2506 | static int genpd_sub_domains_show(struct seq_file *s, void *data) |
2507 | { | |
2508 | struct generic_pm_domain *genpd = s->private; | |
2509 | struct gpd_link *link; | |
2510 | int ret = 0; | |
2511 | ||
2512 | ret = genpd_lock_interruptible(genpd); | |
2513 | if (ret) | |
2514 | return -ERESTARTSYS; | |
2515 | ||
2516 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2517 | seq_printf(s, "%s\n", link->slave->name); | |
2518 | ||
2519 | genpd_unlock(genpd); | |
2520 | return ret; | |
2521 | } | |
2522 | ||
2523 | static int genpd_idle_states_show(struct seq_file *s, void *data) | |
2524 | { | |
2525 | struct generic_pm_domain *genpd = s->private; | |
2526 | unsigned int i; | |
2527 | int ret = 0; | |
2528 | ||
2529 | ret = genpd_lock_interruptible(genpd); | |
2530 | if (ret) | |
2531 | return -ERESTARTSYS; | |
2532 | ||
2533 | seq_puts(s, "State Time Spent(ms)\n"); | |
2534 | ||
2535 | for (i = 0; i < genpd->state_count; i++) { | |
2536 | ktime_t delta = 0; | |
2537 | s64 msecs; | |
2538 | ||
2539 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2540 | (genpd->state_idx == i)) | |
2541 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2542 | ||
2543 | msecs = ktime_to_ms( | |
2544 | ktime_add(genpd->states[i].idle_time, delta)); | |
2545 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2546 | } | |
2547 | ||
2548 | genpd_unlock(genpd); | |
2549 | return ret; | |
2550 | } | |
2551 | ||
2552 | static int genpd_active_time_show(struct seq_file *s, void *data) | |
2553 | { | |
2554 | struct generic_pm_domain *genpd = s->private; | |
2555 | ktime_t delta = 0; | |
2556 | int ret = 0; | |
2557 | ||
2558 | ret = genpd_lock_interruptible(genpd); | |
2559 | if (ret) | |
2560 | return -ERESTARTSYS; | |
2561 | ||
2562 | if (genpd->status == GPD_STATE_ACTIVE) | |
2563 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2564 | ||
2565 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2566 | ktime_add(genpd->on_time, delta))); | |
2567 | ||
2568 | genpd_unlock(genpd); | |
2569 | return ret; | |
2570 | } | |
2571 | ||
2572 | static int genpd_total_idle_time_show(struct seq_file *s, void *data) | |
2573 | { | |
2574 | struct generic_pm_domain *genpd = s->private; | |
2575 | ktime_t delta = 0, total = 0; | |
2576 | unsigned int i; | |
2577 | int ret = 0; | |
2578 | ||
2579 | ret = genpd_lock_interruptible(genpd); | |
2580 | if (ret) | |
2581 | return -ERESTARTSYS; | |
2582 | ||
2583 | for (i = 0; i < genpd->state_count; i++) { | |
2584 | ||
2585 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2586 | (genpd->state_idx == i)) | |
2587 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2588 | ||
2589 | total = ktime_add(total, genpd->states[i].idle_time); | |
2590 | } | |
2591 | total = ktime_add(total, delta); | |
2592 | ||
2593 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2594 | ||
2595 | genpd_unlock(genpd); | |
2596 | return ret; | |
2597 | } | |
2598 | ||
2599 | ||
2600 | static int genpd_devices_show(struct seq_file *s, void *data) | |
2601 | { | |
2602 | struct generic_pm_domain *genpd = s->private; | |
2603 | struct pm_domain_data *pm_data; | |
2604 | const char *kobj_path; | |
2605 | int ret = 0; | |
2606 | ||
2607 | ret = genpd_lock_interruptible(genpd); | |
2608 | if (ret) | |
2609 | return -ERESTARTSYS; | |
2610 | ||
2611 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2612 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2613 | genpd_is_irq_safe(genpd) ? | |
2614 | GFP_ATOMIC : GFP_KERNEL); | |
2615 | if (kobj_path == NULL) | |
2616 | continue; | |
2617 | ||
2618 | seq_printf(s, "%s\n", kobj_path); | |
2619 | kfree(kobj_path); | |
2620 | } | |
2621 | ||
2622 | genpd_unlock(genpd); | |
2623 | return ret; | |
2624 | } | |
2625 | ||
2626 | #define define_genpd_open_function(name) \ | |
2627 | static int genpd_##name##_open(struct inode *inode, struct file *file) \ | |
2628 | { \ | |
2629 | return single_open(file, genpd_##name##_show, inode->i_private); \ | |
2630 | } | |
2631 | ||
2632 | define_genpd_open_function(summary); | |
2633 | define_genpd_open_function(status); | |
2634 | define_genpd_open_function(sub_domains); | |
2635 | define_genpd_open_function(idle_states); | |
2636 | define_genpd_open_function(active_time); | |
2637 | define_genpd_open_function(total_idle_time); | |
2638 | define_genpd_open_function(devices); | |
2639 | ||
2640 | #define define_genpd_debugfs_fops(name) \ | |
2641 | static const struct file_operations genpd_##name##_fops = { \ | |
2642 | .open = genpd_##name##_open, \ | |
2643 | .read = seq_read, \ | |
2644 | .llseek = seq_lseek, \ | |
2645 | .release = single_release, \ | |
2646 | } | |
2647 | ||
2648 | define_genpd_debugfs_fops(summary); | |
2649 | define_genpd_debugfs_fops(status); | |
2650 | define_genpd_debugfs_fops(sub_domains); | |
2651 | define_genpd_debugfs_fops(idle_states); | |
2652 | define_genpd_debugfs_fops(active_time); | |
2653 | define_genpd_debugfs_fops(total_idle_time); | |
2654 | define_genpd_debugfs_fops(devices); | |
2bd5306a | 2655 | |
9e9704ea | 2656 | static int __init genpd_debug_init(void) |
2bd5306a MM |
2657 | { |
2658 | struct dentry *d; | |
b6a1d093 | 2659 | struct generic_pm_domain *genpd; |
2bd5306a | 2660 | |
9e9704ea | 2661 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 2662 | |
9e9704ea | 2663 | if (!genpd_debugfs_dir) |
2bd5306a MM |
2664 | return -ENOMEM; |
2665 | ||
2666 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
9e9704ea | 2667 | genpd_debugfs_dir, NULL, &genpd_summary_fops); |
2bd5306a MM |
2668 | if (!d) |
2669 | return -ENOMEM; | |
2670 | ||
b6a1d093 | 2671 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2672 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
2673 | if (!d) |
2674 | return -ENOMEM; | |
2675 | ||
2676 | debugfs_create_file("current_state", 0444, | |
2677 | d, genpd, &genpd_status_fops); | |
2678 | debugfs_create_file("sub_domains", 0444, | |
2679 | d, genpd, &genpd_sub_domains_fops); | |
2680 | debugfs_create_file("idle_states", 0444, | |
2681 | d, genpd, &genpd_idle_states_fops); | |
2682 | debugfs_create_file("active_time", 0444, | |
2683 | d, genpd, &genpd_active_time_fops); | |
2684 | debugfs_create_file("total_idle_time", 0444, | |
2685 | d, genpd, &genpd_total_idle_time_fops); | |
2686 | debugfs_create_file("devices", 0444, | |
2687 | d, genpd, &genpd_devices_fops); | |
2688 | } | |
2689 | ||
2bd5306a MM |
2690 | return 0; |
2691 | } | |
9e9704ea | 2692 | late_initcall(genpd_debug_init); |
2bd5306a | 2693 | |
9e9704ea | 2694 | static void __exit genpd_debug_exit(void) |
2bd5306a | 2695 | { |
9e9704ea | 2696 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 2697 | } |
9e9704ea | 2698 | __exitcall(genpd_debug_exit); |
8b0510b5 | 2699 | #endif /* CONFIG_DEBUG_FS */ |