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> |
6a0ae73d | 13 | #include <linux/pm_opp.h> |
f721889f RW |
14 | #include <linux/pm_runtime.h> |
15 | #include <linux/pm_domain.h> | |
6ff7bb0d | 16 | #include <linux/pm_qos.h> |
c11f6f5b | 17 | #include <linux/pm_clock.h> |
f721889f RW |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> | |
17b75eca RW |
20 | #include <linux/sched.h> |
21 | #include <linux/suspend.h> | |
d5e4cbfe RW |
22 | #include <linux/export.h> |
23 | ||
aa8e54b5 TV |
24 | #include "power.h" |
25 | ||
93af5e93 GU |
26 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
27 | ||
d5e4cbfe RW |
28 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
29 | ({ \ | |
30 | type (*__routine)(struct device *__d); \ | |
31 | type __ret = (type)0; \ | |
32 | \ | |
33 | __routine = genpd->dev_ops.callback; \ | |
34 | if (__routine) { \ | |
35 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
36 | } \ |
37 | __ret; \ | |
38 | }) | |
f721889f | 39 | |
5125bbf3 RW |
40 | static LIST_HEAD(gpd_list); |
41 | static DEFINE_MUTEX(gpd_list_lock); | |
42 | ||
35241d12 LI |
43 | struct genpd_lock_ops { |
44 | void (*lock)(struct generic_pm_domain *genpd); | |
45 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
46 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
47 | void (*unlock)(struct generic_pm_domain *genpd); | |
48 | }; | |
49 | ||
50 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
51 | { | |
52 | mutex_lock(&genpd->mlock); | |
53 | } | |
54 | ||
55 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
56 | int depth) | |
57 | { | |
58 | mutex_lock_nested(&genpd->mlock, depth); | |
59 | } | |
60 | ||
61 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
62 | { | |
63 | return mutex_lock_interruptible(&genpd->mlock); | |
64 | } | |
65 | ||
66 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
67 | { | |
68 | return mutex_unlock(&genpd->mlock); | |
69 | } | |
70 | ||
71 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
72 | .lock = genpd_lock_mtx, | |
73 | .lock_nested = genpd_lock_nested_mtx, | |
74 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
75 | .unlock = genpd_unlock_mtx, | |
76 | }; | |
77 | ||
d716f479 LI |
78 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
79 | __acquires(&genpd->slock) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
83 | spin_lock_irqsave(&genpd->slock, flags); | |
84 | genpd->lock_flags = flags; | |
85 | } | |
86 | ||
87 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
88 | int depth) | |
89 | __acquires(&genpd->slock) | |
90 | { | |
91 | unsigned long flags; | |
92 | ||
93 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
94 | genpd->lock_flags = flags; | |
95 | } | |
96 | ||
97 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
98 | __acquires(&genpd->slock) | |
99 | { | |
100 | unsigned long flags; | |
101 | ||
102 | spin_lock_irqsave(&genpd->slock, flags); | |
103 | genpd->lock_flags = flags; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
108 | __releases(&genpd->slock) | |
109 | { | |
110 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
111 | } | |
112 | ||
113 | static const struct genpd_lock_ops genpd_spin_ops = { | |
114 | .lock = genpd_lock_spin, | |
115 | .lock_nested = genpd_lock_nested_spin, | |
116 | .lock_interruptible = genpd_lock_interruptible_spin, | |
117 | .unlock = genpd_unlock_spin, | |
118 | }; | |
119 | ||
35241d12 LI |
120 | #define genpd_lock(p) p->lock_ops->lock(p) |
121 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
122 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
123 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
124 | ||
41e2c8e0 | 125 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 126 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 127 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 128 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
d716f479 LI |
129 | |
130 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 131 | const struct generic_pm_domain *genpd) |
d716f479 LI |
132 | { |
133 | bool ret; | |
134 | ||
135 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
136 | ||
075c37d5 UH |
137 | /* |
138 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
139 | * to indicate a suboptimal configuration for PM. For an always on | |
140 | * domain this isn't case, thus don't warn. | |
141 | */ | |
142 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
143 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
144 | genpd->name); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
446d999c RK |
149 | /* |
150 | * Get the generic PM domain for a particular struct device. | |
151 | * This validates the struct device pointer, the PM domain pointer, | |
152 | * and checks that the PM domain pointer is a real generic PM domain. | |
153 | * Any failure results in NULL being returned. | |
154 | */ | |
f58d4e5a | 155 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
156 | { |
157 | struct generic_pm_domain *genpd = NULL, *gpd; | |
158 | ||
159 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
160 | return NULL; | |
161 | ||
162 | mutex_lock(&gpd_list_lock); | |
163 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
164 | if (&gpd->domain == dev->pm_domain) { | |
165 | genpd = gpd; | |
166 | break; | |
167 | } | |
168 | } | |
169 | mutex_unlock(&gpd_list_lock); | |
170 | ||
171 | return genpd; | |
172 | } | |
173 | ||
174 | /* | |
175 | * This should only be used where we are certain that the pm_domain | |
176 | * attached to the device is a genpd domain. | |
177 | */ | |
178 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
179 | { |
180 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
181 | return ERR_PTR(-EINVAL); | |
182 | ||
596ba34b | 183 | return pd_to_genpd(dev->pm_domain); |
5248051b | 184 | } |
f721889f | 185 | |
d8600c8b KK |
186 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
187 | struct device *dev) | |
d5e4cbfe | 188 | { |
2b1d88cd | 189 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
190 | } |
191 | ||
d8600c8b KK |
192 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
193 | struct device *dev) | |
d5e4cbfe | 194 | { |
2b1d88cd | 195 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
196 | } |
197 | ||
c4bb3160 | 198 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 199 | { |
c4bb3160 RW |
200 | bool ret = false; |
201 | ||
202 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
203 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
209 | { | |
210 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 211 | smp_mb__after_atomic(); |
f721889f RW |
212 | } |
213 | ||
afece3ab TG |
214 | #ifdef CONFIG_DEBUG_FS |
215 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
216 | { | |
217 | ktime_t delta, now; | |
218 | ||
219 | now = ktime_get(); | |
220 | delta = ktime_sub(now, genpd->accounting_time); | |
221 | ||
222 | /* | |
223 | * If genpd->status is active, it means we are just | |
224 | * out of off and so update the idle time and vice | |
225 | * versa. | |
226 | */ | |
227 | if (genpd->status == GPD_STATE_ACTIVE) { | |
228 | int state_idx = genpd->state_idx; | |
229 | ||
230 | genpd->states[state_idx].idle_time = | |
231 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
232 | } else { | |
233 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
234 | } | |
235 | ||
236 | genpd->accounting_time = now; | |
237 | } | |
238 | #else | |
239 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
240 | #endif | |
241 | ||
42f6284a VK |
242 | /** |
243 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
244 | * domain. | |
245 | * | |
246 | * @dev: Device for which the performance-state needs to be set. | |
247 | * @state: Target performance state of the device. This can be set as 0 when the | |
248 | * device doesn't have any performance state constraints left (And so | |
249 | * the device wouldn't participate anymore to find the target | |
250 | * performance state of the genpd). | |
251 | * | |
252 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
253 | * while this routine is getting called. | |
254 | * | |
255 | * Returns 0 on success and negative error values on failures. | |
256 | */ | |
257 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
258 | { | |
259 | struct generic_pm_domain *genpd; | |
260 | struct generic_pm_domain_data *gpd_data, *pd_data; | |
261 | struct pm_domain_data *pdd; | |
262 | unsigned int prev; | |
263 | int ret = 0; | |
264 | ||
265 | genpd = dev_to_genpd(dev); | |
266 | if (IS_ERR(genpd)) | |
267 | return -ENODEV; | |
268 | ||
269 | if (unlikely(!genpd->set_performance_state)) | |
270 | return -EINVAL; | |
271 | ||
272 | if (unlikely(!dev->power.subsys_data || | |
273 | !dev->power.subsys_data->domain_data)) { | |
274 | WARN_ON(1); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | genpd_lock(genpd); | |
279 | ||
280 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
281 | prev = gpd_data->performance_state; | |
282 | gpd_data->performance_state = state; | |
283 | ||
284 | /* New requested state is same as Max requested state */ | |
285 | if (state == genpd->performance_state) | |
286 | goto unlock; | |
287 | ||
288 | /* New requested state is higher than Max requested state */ | |
289 | if (state > genpd->performance_state) | |
290 | goto update_state; | |
291 | ||
292 | /* Traverse all devices within the domain */ | |
293 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
294 | pd_data = to_gpd_data(pdd); | |
295 | ||
296 | if (pd_data->performance_state > state) | |
297 | state = pd_data->performance_state; | |
298 | } | |
299 | ||
300 | if (state == genpd->performance_state) | |
301 | goto unlock; | |
302 | ||
303 | /* | |
304 | * We aren't propagating performance state changes of a subdomain to its | |
305 | * masters as we don't have hardware that needs it. Over that, the | |
306 | * performance states of subdomain and its masters may not have | |
307 | * one-to-one mapping and would require additional information. We can | |
308 | * get back to this once we have hardware that needs it. For that | |
309 | * reason, we don't have to consider performance state of the subdomains | |
310 | * of genpd here. | |
311 | */ | |
312 | ||
313 | update_state: | |
68de2fe5 UH |
314 | ret = genpd->set_performance_state(genpd, state); |
315 | if (ret) { | |
316 | gpd_data->performance_state = prev; | |
317 | goto unlock; | |
42f6284a VK |
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)); | |
fc5cbf0c | 348 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
349 | return ret; |
350 | ||
fc5cbf0c | 351 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 352 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
353 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
354 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
355 | |
356 | return ret; | |
357 | } | |
358 | ||
86e12eac | 359 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 360 | { |
fc5cbf0c | 361 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
362 | ktime_t time_start; |
363 | s64 elapsed_ns; | |
364 | int ret; | |
365 | ||
366 | if (!genpd->power_off) | |
367 | return 0; | |
368 | ||
a4630c61 GU |
369 | if (!timed) |
370 | return genpd->power_off(genpd); | |
371 | ||
c8f0ea45 GU |
372 | time_start = ktime_get(); |
373 | ret = genpd->power_off(genpd); | |
374 | if (ret == -EBUSY) | |
375 | return ret; | |
376 | ||
377 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 378 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
379 | return ret; |
380 | ||
fc5cbf0c | 381 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 382 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
383 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
384 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
385 | |
386 | return ret; | |
387 | } | |
388 | ||
29e47e21 | 389 | /** |
86e12eac | 390 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 391 | * @genpd: PM domain to power off. |
29e47e21 | 392 | * |
86e12eac | 393 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
394 | * before. |
395 | */ | |
396 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
397 | { | |
398 | queue_work(pm_wq, &genpd->power_off_work); | |
399 | } | |
400 | ||
1f8728b7 UH |
401 | /** |
402 | * genpd_power_off - Remove power from a given PM domain. | |
403 | * @genpd: PM domain to power down. | |
3c64649d UH |
404 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
405 | * RPM status of the releated device is in an intermediate state, not yet turned | |
406 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
407 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
408 | * |
409 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
410 | * have been powered down, remove power from @genpd. | |
411 | */ | |
2da83545 UH |
412 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
413 | unsigned int depth) | |
1f8728b7 UH |
414 | { |
415 | struct pm_domain_data *pdd; | |
416 | struct gpd_link *link; | |
417 | unsigned int not_suspended = 0; | |
418 | ||
419 | /* | |
420 | * Do not try to power off the domain in the following situations: | |
421 | * (1) The domain is already in the "power off" state. | |
422 | * (2) System suspend is in progress. | |
423 | */ | |
41e2c8e0 | 424 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
425 | return 0; |
426 | ||
ffaa42e8 UH |
427 | /* |
428 | * Abort power off for the PM domain in the following situations: | |
429 | * (1) The domain is configured as always on. | |
430 | * (2) When the domain has a subdomain being powered on. | |
431 | */ | |
432 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
433 | return -EBUSY; |
434 | ||
435 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
436 | enum pm_qos_flags_status stat; | |
437 | ||
20f97caf | 438 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
439 | if (stat > PM_QOS_FLAGS_NONE) |
440 | return -EBUSY; | |
441 | ||
442 | /* | |
443 | * Do not allow PM domain to be powered off, when an IRQ safe | |
444 | * device is part of a non-IRQ safe domain. | |
445 | */ | |
446 | if (!pm_runtime_suspended(pdd->dev) || | |
447 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
448 | not_suspended++; | |
449 | } | |
450 | ||
3c64649d | 451 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
452 | return -EBUSY; |
453 | ||
454 | if (genpd->gov && genpd->gov->power_down_ok) { | |
455 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
456 | return -EAGAIN; | |
457 | } | |
458 | ||
2c9b7f87 UH |
459 | /* Default to shallowest state. */ |
460 | if (!genpd->gov) | |
461 | genpd->state_idx = 0; | |
462 | ||
1f8728b7 UH |
463 | if (genpd->power_off) { |
464 | int ret; | |
465 | ||
466 | if (atomic_read(&genpd->sd_count) > 0) | |
467 | return -EBUSY; | |
468 | ||
469 | /* | |
470 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
471 | * managed to call genpd_power_on() for the master yet after | |
472 | * incrementing it. In that case genpd_power_on() will wait | |
473 | * for us to drop the lock, so we can call .power_off() and let | |
474 | * the genpd_power_on() restore power for us (this shouldn't | |
475 | * happen very often). | |
476 | */ | |
477 | ret = _genpd_power_off(genpd, true); | |
478 | if (ret) | |
479 | return ret; | |
480 | } | |
481 | ||
482 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 483 | genpd_update_accounting(genpd); |
1f8728b7 UH |
484 | |
485 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
486 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
487 | genpd_lock_nested(link->master, depth + 1); |
488 | genpd_power_off(link->master, false, depth + 1); | |
489 | genpd_unlock(link->master); | |
1f8728b7 UH |
490 | } |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
5248051b | 495 | /** |
86e12eac | 496 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 497 | * @genpd: PM domain to power up. |
0106ef51 | 498 | * @depth: nesting count for lockdep. |
5248051b | 499 | * |
5063ce15 | 500 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
501 | * resume a device belonging to it. |
502 | */ | |
86e12eac | 503 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 504 | { |
5063ce15 | 505 | struct gpd_link *link; |
5248051b RW |
506 | int ret = 0; |
507 | ||
41e2c8e0 | 508 | if (genpd_status_on(genpd)) |
3f241775 | 509 | return 0; |
5248051b | 510 | |
5063ce15 RW |
511 | /* |
512 | * The list is guaranteed not to change while the loop below is being | |
513 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
514 | * with it. | |
515 | */ | |
516 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
517 | struct generic_pm_domain *master = link->master; |
518 | ||
519 | genpd_sd_counter_inc(master); | |
520 | ||
35241d12 | 521 | genpd_lock_nested(master, depth + 1); |
86e12eac | 522 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 523 | genpd_unlock(master); |
5248051b | 524 | |
5063ce15 | 525 | if (ret) { |
0106ef51 | 526 | genpd_sd_counter_dec(master); |
9e08cf42 | 527 | goto err; |
5063ce15 | 528 | } |
5248051b RW |
529 | } |
530 | ||
86e12eac | 531 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
532 | if (ret) |
533 | goto err; | |
5248051b | 534 | |
ba2bbfbf | 535 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
536 | genpd_update_accounting(genpd); |
537 | ||
3f241775 | 538 | return 0; |
9e08cf42 RW |
539 | |
540 | err: | |
29e47e21 UH |
541 | list_for_each_entry_continue_reverse(link, |
542 | &genpd->slave_links, | |
543 | slave_node) { | |
5063ce15 | 544 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
545 | genpd_lock_nested(link->master, depth + 1); |
546 | genpd_power_off(link->master, false, depth + 1); | |
547 | genpd_unlock(link->master); | |
29e47e21 | 548 | } |
9e08cf42 | 549 | |
3f241775 RW |
550 | return ret; |
551 | } | |
552 | ||
6ff7bb0d RW |
553 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
554 | unsigned long val, void *ptr) | |
555 | { | |
556 | struct generic_pm_domain_data *gpd_data; | |
557 | struct device *dev; | |
558 | ||
559 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 560 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
561 | |
562 | for (;;) { | |
563 | struct generic_pm_domain *genpd; | |
564 | struct pm_domain_data *pdd; | |
565 | ||
566 | spin_lock_irq(&dev->power.lock); | |
567 | ||
568 | pdd = dev->power.subsys_data ? | |
569 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 570 | if (pdd) { |
6ff7bb0d RW |
571 | to_gpd_data(pdd)->td.constraint_changed = true; |
572 | genpd = dev_to_genpd(dev); | |
573 | } else { | |
574 | genpd = ERR_PTR(-ENODATA); | |
575 | } | |
576 | ||
577 | spin_unlock_irq(&dev->power.lock); | |
578 | ||
579 | if (!IS_ERR(genpd)) { | |
35241d12 | 580 | genpd_lock(genpd); |
6ff7bb0d | 581 | genpd->max_off_time_changed = true; |
35241d12 | 582 | genpd_unlock(genpd); |
6ff7bb0d RW |
583 | } |
584 | ||
585 | dev = dev->parent; | |
586 | if (!dev || dev->power.ignore_children) | |
587 | break; | |
588 | } | |
589 | ||
590 | return NOTIFY_DONE; | |
591 | } | |
592 | ||
f721889f RW |
593 | /** |
594 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
595 | * @work: Work structure used for scheduling the execution of this function. | |
596 | */ | |
597 | static void genpd_power_off_work_fn(struct work_struct *work) | |
598 | { | |
599 | struct generic_pm_domain *genpd; | |
600 | ||
601 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
602 | ||
35241d12 | 603 | genpd_lock(genpd); |
2da83545 | 604 | genpd_power_off(genpd, false, 0); |
35241d12 | 605 | genpd_unlock(genpd); |
f721889f RW |
606 | } |
607 | ||
54eeddbf UH |
608 | /** |
609 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
610 | * @dev: Device to handle. | |
611 | */ | |
612 | static int __genpd_runtime_suspend(struct device *dev) | |
613 | { | |
614 | int (*cb)(struct device *__dev); | |
615 | ||
616 | if (dev->type && dev->type->pm) | |
617 | cb = dev->type->pm->runtime_suspend; | |
618 | else if (dev->class && dev->class->pm) | |
619 | cb = dev->class->pm->runtime_suspend; | |
620 | else if (dev->bus && dev->bus->pm) | |
621 | cb = dev->bus->pm->runtime_suspend; | |
622 | else | |
623 | cb = NULL; | |
624 | ||
625 | if (!cb && dev->driver && dev->driver->pm) | |
626 | cb = dev->driver->pm->runtime_suspend; | |
627 | ||
628 | return cb ? cb(dev) : 0; | |
629 | } | |
630 | ||
631 | /** | |
632 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
633 | * @dev: Device to handle. | |
634 | */ | |
635 | static int __genpd_runtime_resume(struct device *dev) | |
636 | { | |
637 | int (*cb)(struct device *__dev); | |
638 | ||
639 | if (dev->type && dev->type->pm) | |
640 | cb = dev->type->pm->runtime_resume; | |
641 | else if (dev->class && dev->class->pm) | |
642 | cb = dev->class->pm->runtime_resume; | |
643 | else if (dev->bus && dev->bus->pm) | |
644 | cb = dev->bus->pm->runtime_resume; | |
645 | else | |
646 | cb = NULL; | |
647 | ||
648 | if (!cb && dev->driver && dev->driver->pm) | |
649 | cb = dev->driver->pm->runtime_resume; | |
650 | ||
651 | return cb ? cb(dev) : 0; | |
652 | } | |
653 | ||
f721889f | 654 | /** |
795bd2e7 | 655 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
656 | * @dev: Device to suspend. |
657 | * | |
658 | * Carry out a runtime suspend of a device under the assumption that its | |
659 | * pm_domain field points to the domain member of an object of type | |
660 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
661 | */ | |
795bd2e7 | 662 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
663 | { |
664 | struct generic_pm_domain *genpd; | |
9df3921e | 665 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 666 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 667 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
668 | ktime_t time_start; |
669 | s64 elapsed_ns; | |
d5e4cbfe | 670 | int ret; |
f721889f RW |
671 | |
672 | dev_dbg(dev, "%s()\n", __func__); | |
673 | ||
5248051b RW |
674 | genpd = dev_to_genpd(dev); |
675 | if (IS_ERR(genpd)) | |
f721889f RW |
676 | return -EINVAL; |
677 | ||
ffe12855 UH |
678 | /* |
679 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
680 | * callbacks for other purposes than runtime PM. In those scenarios | |
681 | * runtime PM is disabled. Under these circumstances, we shall skip | |
682 | * validating/measuring the PM QoS latency. | |
683 | */ | |
9df3921e UH |
684 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
685 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
686 | return -EBUSY; |
687 | ||
2b1d88cd | 688 | /* Measure suspend latency. */ |
d33d5a6c | 689 | time_start = 0; |
ffe12855 UH |
690 | if (runtime_pm) |
691 | time_start = ktime_get(); | |
2b1d88cd | 692 | |
54eeddbf | 693 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
694 | if (ret) |
695 | return ret; | |
17b75eca | 696 | |
2b1d88cd | 697 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 698 | if (ret) { |
54eeddbf | 699 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
700 | return ret; |
701 | } | |
702 | ||
2b1d88cd | 703 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
704 | if (runtime_pm) { |
705 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
706 | if (elapsed_ns > td->suspend_latency_ns) { | |
707 | td->suspend_latency_ns = elapsed_ns; | |
708 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
709 | elapsed_ns); | |
710 | genpd->max_off_time_changed = true; | |
711 | td->constraint_changed = true; | |
712 | } | |
2b1d88cd UH |
713 | } |
714 | ||
0aa2a221 | 715 | /* |
d716f479 LI |
716 | * If power.irq_safe is set, this routine may be run with |
717 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 718 | */ |
d716f479 | 719 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
720 | return 0; |
721 | ||
35241d12 | 722 | genpd_lock(genpd); |
2da83545 | 723 | genpd_power_off(genpd, true, 0); |
35241d12 | 724 | genpd_unlock(genpd); |
f721889f RW |
725 | |
726 | return 0; | |
727 | } | |
728 | ||
f721889f | 729 | /** |
795bd2e7 | 730 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
731 | * @dev: Device to resume. |
732 | * | |
733 | * Carry out a runtime resume of a device under the assumption that its | |
734 | * pm_domain field points to the domain member of an object of type | |
735 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
736 | */ | |
795bd2e7 | 737 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
738 | { |
739 | struct generic_pm_domain *genpd; | |
2b1d88cd | 740 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 741 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
742 | ktime_t time_start; |
743 | s64 elapsed_ns; | |
f721889f | 744 | int ret; |
ba2bbfbf | 745 | bool timed = true; |
f721889f RW |
746 | |
747 | dev_dbg(dev, "%s()\n", __func__); | |
748 | ||
5248051b RW |
749 | genpd = dev_to_genpd(dev); |
750 | if (IS_ERR(genpd)) | |
f721889f RW |
751 | return -EINVAL; |
752 | ||
d716f479 LI |
753 | /* |
754 | * As we don't power off a non IRQ safe domain, which holds | |
755 | * an IRQ safe device, we don't need to restore power to it. | |
756 | */ | |
757 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
758 | timed = false; |
759 | goto out; | |
760 | } | |
0aa2a221 | 761 | |
35241d12 | 762 | genpd_lock(genpd); |
86e12eac | 763 | ret = genpd_power_on(genpd, 0); |
35241d12 | 764 | genpd_unlock(genpd); |
c6d22b37 | 765 | |
ba2bbfbf UH |
766 | if (ret) |
767 | return ret; | |
c6d22b37 | 768 | |
ba2bbfbf | 769 | out: |
2b1d88cd | 770 | /* Measure resume latency. */ |
ab51e6ba | 771 | time_start = 0; |
ffe12855 | 772 | if (timed && runtime_pm) |
2b1d88cd UH |
773 | time_start = ktime_get(); |
774 | ||
076395ca LP |
775 | ret = genpd_start_dev(genpd, dev); |
776 | if (ret) | |
777 | goto err_poweroff; | |
778 | ||
54eeddbf | 779 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
780 | if (ret) |
781 | goto err_stop; | |
2b1d88cd UH |
782 | |
783 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 784 | if (timed && runtime_pm) { |
2b1d88cd UH |
785 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
786 | if (elapsed_ns > td->resume_latency_ns) { | |
787 | td->resume_latency_ns = elapsed_ns; | |
788 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
789 | elapsed_ns); | |
790 | genpd->max_off_time_changed = true; | |
791 | td->constraint_changed = true; | |
792 | } | |
793 | } | |
17b75eca | 794 | |
f721889f | 795 | return 0; |
076395ca LP |
796 | |
797 | err_stop: | |
798 | genpd_stop_dev(genpd, dev); | |
799 | err_poweroff: | |
d716f479 LI |
800 | if (!pm_runtime_is_irq_safe(dev) || |
801 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 802 | genpd_lock(genpd); |
2da83545 | 803 | genpd_power_off(genpd, true, 0); |
35241d12 | 804 | genpd_unlock(genpd); |
076395ca LP |
805 | } |
806 | ||
807 | return ret; | |
f721889f RW |
808 | } |
809 | ||
39ac5ba5 TB |
810 | static bool pd_ignore_unused; |
811 | static int __init pd_ignore_unused_setup(char *__unused) | |
812 | { | |
813 | pd_ignore_unused = true; | |
814 | return 1; | |
815 | } | |
816 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
817 | ||
17f2ae7f | 818 | /** |
86e12eac | 819 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 820 | */ |
86e12eac | 821 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
822 | { |
823 | struct generic_pm_domain *genpd; | |
824 | ||
39ac5ba5 TB |
825 | if (pd_ignore_unused) { |
826 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 827 | return 0; |
39ac5ba5 TB |
828 | } |
829 | ||
17f2ae7f RW |
830 | mutex_lock(&gpd_list_lock); |
831 | ||
832 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
833 | genpd_queue_power_off_work(genpd); | |
834 | ||
835 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 836 | |
2fe71dcd UH |
837 | return 0; |
838 | } | |
86e12eac | 839 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 840 | |
0159ec67 | 841 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 842 | |
9e9704ea | 843 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 844 | { |
895b31f3 | 845 | const struct generic_pm_domain *gpd; |
77f827de RW |
846 | |
847 | if (IS_ERR_OR_NULL(genpd)) | |
848 | return false; | |
849 | ||
850 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
851 | if (gpd == genpd) | |
852 | return true; | |
853 | ||
854 | return false; | |
855 | } | |
856 | ||
0159ec67 JH |
857 | #endif |
858 | ||
859 | #ifdef CONFIG_PM_SLEEP | |
860 | ||
596ba34b | 861 | /** |
86e12eac | 862 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 863 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
864 | * @use_lock: use the lock. |
865 | * @depth: nesting count for lockdep. | |
596ba34b RW |
866 | * |
867 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 868 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 869 | * |
77f827de | 870 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
871 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
872 | * these cases the lock must be held. | |
596ba34b | 873 | */ |
0883ac03 UH |
874 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
875 | unsigned int depth) | |
596ba34b | 876 | { |
5063ce15 | 877 | struct gpd_link *link; |
596ba34b | 878 | |
ffaa42e8 | 879 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
880 | return; |
881 | ||
c4bb3160 RW |
882 | if (genpd->suspended_count != genpd->device_count |
883 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
884 | return; |
885 | ||
fc5cbf0c AH |
886 | /* Choose the deepest state when suspending */ |
887 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
888 | if (_genpd_power_off(genpd, false)) |
889 | return; | |
596ba34b | 890 | |
17b75eca | 891 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
892 | |
893 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
894 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
895 | |
896 | if (use_lock) | |
897 | genpd_lock_nested(link->master, depth + 1); | |
898 | ||
899 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
900 | ||
901 | if (use_lock) | |
902 | genpd_unlock(link->master); | |
596ba34b RW |
903 | } |
904 | } | |
905 | ||
802d8b49 | 906 | /** |
86e12eac | 907 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 908 | * @genpd: PM domain to power on. |
0883ac03 UH |
909 | * @use_lock: use the lock. |
910 | * @depth: nesting count for lockdep. | |
802d8b49 | 911 | * |
77f827de | 912 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
913 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
914 | * these cases the lock must be held. | |
802d8b49 | 915 | */ |
0883ac03 UH |
916 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
917 | unsigned int depth) | |
802d8b49 RW |
918 | { |
919 | struct gpd_link *link; | |
920 | ||
41e2c8e0 | 921 | if (genpd_status_on(genpd)) |
802d8b49 RW |
922 | return; |
923 | ||
924 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 925 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
926 | |
927 | if (use_lock) | |
928 | genpd_lock_nested(link->master, depth + 1); | |
929 | ||
930 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
931 | ||
932 | if (use_lock) | |
933 | genpd_unlock(link->master); | |
802d8b49 RW |
934 | } |
935 | ||
86e12eac | 936 | _genpd_power_on(genpd, false); |
802d8b49 RW |
937 | |
938 | genpd->status = GPD_STATE_ACTIVE; | |
939 | } | |
940 | ||
4ecd6e65 RW |
941 | /** |
942 | * resume_needed - Check whether to resume a device before system suspend. | |
943 | * @dev: Device to check. | |
944 | * @genpd: PM domain the device belongs to. | |
945 | * | |
946 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 947 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
948 | * to wake up the system and it has to remain active for this purpose while the |
949 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
950 | * the system from sleep states and it generally doesn't generate wakeup signals | |
951 | * by itself (those signals are generated on its behalf by other parts of the | |
952 | * system). In the latter case it may be necessary to reconfigure the device's | |
953 | * wakeup settings during system suspend, because it may have been set up to | |
954 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
955 | * Return 'true' in either of the above cases. | |
956 | */ | |
d8600c8b KK |
957 | static bool resume_needed(struct device *dev, |
958 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
959 | { |
960 | bool active_wakeup; | |
961 | ||
962 | if (!device_can_wakeup(dev)) | |
963 | return false; | |
964 | ||
d0af45f1 | 965 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
966 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
967 | } | |
968 | ||
596ba34b | 969 | /** |
9e9704ea | 970 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
971 | * @dev: Device to start the transition of. |
972 | * | |
973 | * Start a power transition of a device (during a system-wide power transition) | |
974 | * under the assumption that its pm_domain field points to the domain member of | |
975 | * an object of type struct generic_pm_domain representing a PM domain | |
976 | * consisting of I/O devices. | |
977 | */ | |
9e9704ea | 978 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
979 | { |
980 | struct generic_pm_domain *genpd; | |
b6c10c84 | 981 | int ret; |
596ba34b RW |
982 | |
983 | dev_dbg(dev, "%s()\n", __func__); | |
984 | ||
985 | genpd = dev_to_genpd(dev); | |
986 | if (IS_ERR(genpd)) | |
987 | return -EINVAL; | |
988 | ||
17b75eca RW |
989 | /* |
990 | * If a wakeup request is pending for the device, it should be woken up | |
991 | * at this point and a system wakeup event should be reported if it's | |
992 | * set up to wake up the system from sleep states. | |
993 | */ | |
4ecd6e65 RW |
994 | if (resume_needed(dev, genpd)) |
995 | pm_runtime_resume(dev); | |
996 | ||
35241d12 | 997 | genpd_lock(genpd); |
596ba34b | 998 | |
39dd0f23 | 999 | if (genpd->prepared_count++ == 0) |
65533bbf | 1000 | genpd->suspended_count = 0; |
17b75eca | 1001 | |
35241d12 | 1002 | genpd_unlock(genpd); |
596ba34b | 1003 | |
b6c10c84 | 1004 | ret = pm_generic_prepare(dev); |
5241ab40 | 1005 | if (ret < 0) { |
35241d12 | 1006 | genpd_lock(genpd); |
b6c10c84 | 1007 | |
39dd0f23 | 1008 | genpd->prepared_count--; |
b6c10c84 | 1009 | |
35241d12 | 1010 | genpd_unlock(genpd); |
b6c10c84 | 1011 | } |
17b75eca | 1012 | |
5241ab40 UH |
1013 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1014 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1015 | } |
1016 | ||
0496c8ae | 1017 | /** |
10da6542 MP |
1018 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1019 | * I/O pm domain. | |
0496c8ae | 1020 | * @dev: Device to suspend. |
10da6542 | 1021 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1022 | * |
1023 | * Stop the device and remove power from the domain if all devices in it have | |
1024 | * been stopped. | |
1025 | */ | |
10da6542 | 1026 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1027 | { |
1028 | struct generic_pm_domain *genpd; | |
a935424b | 1029 | int ret = 0; |
0496c8ae | 1030 | |
0496c8ae RW |
1031 | genpd = dev_to_genpd(dev); |
1032 | if (IS_ERR(genpd)) | |
1033 | return -EINVAL; | |
596ba34b | 1034 | |
10da6542 MP |
1035 | if (poweroff) |
1036 | ret = pm_generic_poweroff_noirq(dev); | |
1037 | else | |
1038 | ret = pm_generic_suspend_noirq(dev); | |
1039 | if (ret) | |
1040 | return ret; | |
1041 | ||
a935424b UH |
1042 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1043 | return 0; | |
1044 | ||
17218e00 RW |
1045 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1046 | !pm_runtime_status_suspended(dev)) { | |
1047 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1048 | if (ret) { |
1049 | if (poweroff) | |
1050 | pm_generic_restore_noirq(dev); | |
1051 | else | |
1052 | pm_generic_resume_noirq(dev); | |
122a2237 | 1053 | return ret; |
a935424b | 1054 | } |
122a2237 UH |
1055 | } |
1056 | ||
0883ac03 | 1057 | genpd_lock(genpd); |
596ba34b | 1058 | genpd->suspended_count++; |
0883ac03 UH |
1059 | genpd_sync_power_off(genpd, true, 0); |
1060 | genpd_unlock(genpd); | |
596ba34b RW |
1061 | |
1062 | return 0; | |
1063 | } | |
1064 | ||
10da6542 | 1065 | /** |
9e9704ea | 1066 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1067 | * @dev: Device to suspend. |
1068 | * | |
1069 | * Stop the device and remove power from the domain if all devices in it have | |
1070 | * been stopped. | |
1071 | */ | |
9e9704ea | 1072 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1073 | { |
1074 | dev_dbg(dev, "%s()\n", __func__); | |
1075 | ||
1076 | return genpd_finish_suspend(dev, false); | |
1077 | } | |
1078 | ||
596ba34b | 1079 | /** |
9e9704ea | 1080 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1081 | * @dev: Device to resume. |
1082 | * | |
0496c8ae | 1083 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1084 | */ |
9e9704ea | 1085 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1086 | { |
1087 | struct generic_pm_domain *genpd; | |
a935424b | 1088 | int ret; |
596ba34b RW |
1089 | |
1090 | dev_dbg(dev, "%s()\n", __func__); | |
1091 | ||
1092 | genpd = dev_to_genpd(dev); | |
1093 | if (IS_ERR(genpd)) | |
1094 | return -EINVAL; | |
1095 | ||
d0af45f1 | 1096 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1097 | return pm_generic_resume_noirq(dev); |
596ba34b | 1098 | |
0883ac03 UH |
1099 | genpd_lock(genpd); |
1100 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1101 | genpd->suspended_count--; |
0883ac03 | 1102 | genpd_unlock(genpd); |
596ba34b | 1103 | |
17218e00 RW |
1104 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1105 | !pm_runtime_status_suspended(dev)) { | |
1106 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1107 | if (ret) |
1108 | return ret; | |
1109 | } | |
122a2237 | 1110 | |
a935424b | 1111 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1112 | } |
1113 | ||
0496c8ae | 1114 | /** |
9e9704ea | 1115 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1116 | * @dev: Device to freeze. |
1117 | * | |
1118 | * Carry out a late freeze of a device under the assumption that its | |
1119 | * pm_domain field points to the domain member of an object of type | |
1120 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1121 | * devices. | |
1122 | */ | |
9e9704ea | 1123 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1124 | { |
d8600c8b | 1125 | const struct generic_pm_domain *genpd; |
122a2237 | 1126 | int ret = 0; |
596ba34b RW |
1127 | |
1128 | dev_dbg(dev, "%s()\n", __func__); | |
1129 | ||
1130 | genpd = dev_to_genpd(dev); | |
1131 | if (IS_ERR(genpd)) | |
1132 | return -EINVAL; | |
1133 | ||
10da6542 MP |
1134 | ret = pm_generic_freeze_noirq(dev); |
1135 | if (ret) | |
1136 | return ret; | |
1137 | ||
17218e00 RW |
1138 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1139 | !pm_runtime_status_suspended(dev)) | |
1140 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1141 | |
1142 | return ret; | |
0496c8ae | 1143 | } |
596ba34b | 1144 | |
0496c8ae | 1145 | /** |
9e9704ea | 1146 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1147 | * @dev: Device to thaw. |
1148 | * | |
1149 | * Start the device, unless power has been removed from the domain already | |
1150 | * before the system transition. | |
1151 | */ | |
9e9704ea | 1152 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1153 | { |
d8600c8b | 1154 | const struct generic_pm_domain *genpd; |
122a2237 | 1155 | int ret = 0; |
596ba34b | 1156 | |
0496c8ae | 1157 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1158 | |
0496c8ae RW |
1159 | genpd = dev_to_genpd(dev); |
1160 | if (IS_ERR(genpd)) | |
1161 | return -EINVAL; | |
1162 | ||
17218e00 RW |
1163 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1164 | !pm_runtime_status_suspended(dev)) { | |
1165 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1166 | if (ret) |
1167 | return ret; | |
1168 | } | |
122a2237 | 1169 | |
10da6542 MP |
1170 | return pm_generic_thaw_noirq(dev); |
1171 | } | |
1172 | ||
1173 | /** | |
9e9704ea | 1174 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1175 | * I/O PM domain. |
1176 | * @dev: Device to poweroff. | |
1177 | * | |
1178 | * Stop the device and remove power from the domain if all devices in it have | |
1179 | * been stopped. | |
1180 | */ | |
9e9704ea | 1181 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1182 | { |
1183 | dev_dbg(dev, "%s()\n", __func__); | |
1184 | ||
1185 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1186 | } |
1187 | ||
596ba34b | 1188 | /** |
9e9704ea | 1189 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1190 | * @dev: Device to resume. |
1191 | * | |
0496c8ae RW |
1192 | * Make sure the domain will be in the same power state as before the |
1193 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1194 | */ |
9e9704ea | 1195 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1196 | { |
1197 | struct generic_pm_domain *genpd; | |
122a2237 | 1198 | int ret = 0; |
596ba34b RW |
1199 | |
1200 | dev_dbg(dev, "%s()\n", __func__); | |
1201 | ||
1202 | genpd = dev_to_genpd(dev); | |
1203 | if (IS_ERR(genpd)) | |
1204 | return -EINVAL; | |
1205 | ||
1206 | /* | |
65533bbf RW |
1207 | * At this point suspended_count == 0 means we are being run for the |
1208 | * first time for the given domain in the present cycle. | |
596ba34b | 1209 | */ |
0883ac03 | 1210 | genpd_lock(genpd); |
39dd0f23 | 1211 | if (genpd->suspended_count++ == 0) |
596ba34b | 1212 | /* |
65533bbf | 1213 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1214 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1215 | * so that it tries to power it on in case it was really off. |
596ba34b | 1216 | */ |
65533bbf | 1217 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1218 | |
0883ac03 UH |
1219 | genpd_sync_power_on(genpd, true, 0); |
1220 | genpd_unlock(genpd); | |
596ba34b | 1221 | |
17218e00 RW |
1222 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1223 | !pm_runtime_status_suspended(dev)) { | |
1224 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1225 | if (ret) |
1226 | return ret; | |
1227 | } | |
122a2237 | 1228 | |
10da6542 | 1229 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1230 | } |
1231 | ||
1232 | /** | |
9e9704ea | 1233 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1234 | * @dev: Device to complete the transition of. |
1235 | * | |
1236 | * Complete a power transition of a device (during a system-wide power | |
1237 | * transition) under the assumption that its pm_domain field points to the | |
1238 | * domain member of an object of type struct generic_pm_domain representing | |
1239 | * a power domain consisting of I/O devices. | |
1240 | */ | |
9e9704ea | 1241 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1242 | { |
1243 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1244 | |
1245 | dev_dbg(dev, "%s()\n", __func__); | |
1246 | ||
1247 | genpd = dev_to_genpd(dev); | |
1248 | if (IS_ERR(genpd)) | |
1249 | return; | |
1250 | ||
4d23a5e8 UH |
1251 | pm_generic_complete(dev); |
1252 | ||
35241d12 | 1253 | genpd_lock(genpd); |
596ba34b | 1254 | |
39dd0f23 | 1255 | genpd->prepared_count--; |
4d23a5e8 UH |
1256 | if (!genpd->prepared_count) |
1257 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1258 | |
35241d12 | 1259 | genpd_unlock(genpd); |
596ba34b RW |
1260 | } |
1261 | ||
77f827de | 1262 | /** |
d47e6464 | 1263 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1264 | * @dev: Device that normally is marked as "always on" to switch power for. |
1265 | * | |
1266 | * This routine may only be called during the system core (syscore) suspend or | |
1267 | * resume phase for devices whose "always on" flags are set. | |
1268 | */ | |
d47e6464 | 1269 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1270 | { |
1271 | struct generic_pm_domain *genpd; | |
1272 | ||
23c6d2c7 | 1273 | genpd = dev_to_genpd(dev); |
9e9704ea | 1274 | if (!genpd_present(genpd)) |
77f827de RW |
1275 | return; |
1276 | ||
1277 | if (suspend) { | |
1278 | genpd->suspended_count++; | |
0883ac03 | 1279 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1280 | } else { |
0883ac03 | 1281 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1282 | genpd->suspended_count--; |
1283 | } | |
1284 | } | |
d47e6464 UH |
1285 | |
1286 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1287 | { | |
1288 | genpd_syscore_switch(dev, true); | |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1291 | ||
1292 | void pm_genpd_syscore_poweron(struct device *dev) | |
1293 | { | |
1294 | genpd_syscore_switch(dev, false); | |
1295 | } | |
1296 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1297 | |
d30d819d | 1298 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1299 | |
9e9704ea UH |
1300 | #define genpd_prepare NULL |
1301 | #define genpd_suspend_noirq NULL | |
1302 | #define genpd_resume_noirq NULL | |
1303 | #define genpd_freeze_noirq NULL | |
1304 | #define genpd_thaw_noirq NULL | |
1305 | #define genpd_poweroff_noirq NULL | |
1306 | #define genpd_restore_noirq NULL | |
1307 | #define genpd_complete NULL | |
596ba34b RW |
1308 | |
1309 | #endif /* CONFIG_PM_SLEEP */ | |
1310 | ||
f104e1e5 | 1311 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
f104e1e5 | 1312 | struct gpd_timing_data *td) |
1d5fcfec RW |
1313 | { |
1314 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1315 | int ret; |
1316 | ||
1317 | ret = dev_pm_get_subsys_data(dev); | |
1318 | if (ret) | |
1319 | return ERR_PTR(ret); | |
1d5fcfec RW |
1320 | |
1321 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1322 | if (!gpd_data) { |
1323 | ret = -ENOMEM; | |
1324 | goto err_put; | |
1325 | } | |
1d5fcfec | 1326 | |
f104e1e5 UH |
1327 | if (td) |
1328 | gpd_data->td = *td; | |
1329 | ||
1330 | gpd_data->base.dev = dev; | |
f104e1e5 | 1331 | gpd_data->td.constraint_changed = true; |
0759e80b | 1332 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1333 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1334 | ||
1335 | spin_lock_irq(&dev->power.lock); | |
1336 | ||
1337 | if (dev->power.subsys_data->domain_data) { | |
1338 | ret = -EINVAL; | |
1339 | goto err_free; | |
1340 | } | |
1341 | ||
1342 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1343 | |
1344 | spin_unlock_irq(&dev->power.lock); | |
1345 | ||
1d5fcfec | 1346 | return gpd_data; |
3e235685 | 1347 | |
f104e1e5 UH |
1348 | err_free: |
1349 | spin_unlock_irq(&dev->power.lock); | |
1350 | kfree(gpd_data); | |
3e235685 UH |
1351 | err_put: |
1352 | dev_pm_put_subsys_data(dev); | |
1353 | return ERR_PTR(ret); | |
1d5fcfec RW |
1354 | } |
1355 | ||
49d400c7 UH |
1356 | static void genpd_free_dev_data(struct device *dev, |
1357 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1358 | { |
f104e1e5 UH |
1359 | spin_lock_irq(&dev->power.lock); |
1360 | ||
f104e1e5 UH |
1361 | dev->power.subsys_data->domain_data = NULL; |
1362 | ||
1363 | spin_unlock_irq(&dev->power.lock); | |
1364 | ||
1d5fcfec | 1365 | kfree(gpd_data); |
3e235685 | 1366 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1367 | } |
1368 | ||
19efa5ff JH |
1369 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1370 | struct gpd_timing_data *td) | |
f721889f | 1371 | { |
c0356db7 | 1372 | struct generic_pm_domain_data *gpd_data; |
b56d9c91 | 1373 | int ret; |
f721889f RW |
1374 | |
1375 | dev_dbg(dev, "%s()\n", __func__); | |
1376 | ||
1377 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1378 | return -EINVAL; | |
1379 | ||
96c1bf68 | 1380 | gpd_data = genpd_alloc_dev_data(dev, td); |
3e235685 UH |
1381 | if (IS_ERR(gpd_data)) |
1382 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1383 | |
35241d12 | 1384 | genpd_lock(genpd); |
f721889f | 1385 | |
b472c2fa UH |
1386 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1387 | if (ret) | |
1388 | goto out; | |
d79b6fe1 | 1389 | |
975e83cf SH |
1390 | dev_pm_domain_set(dev, &genpd->domain); |
1391 | ||
14b53064 UH |
1392 | genpd->device_count++; |
1393 | genpd->max_off_time_changed = true; | |
1394 | ||
1d5fcfec | 1395 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1396 | |
f721889f | 1397 | out: |
35241d12 | 1398 | genpd_unlock(genpd); |
f721889f | 1399 | |
c0356db7 UH |
1400 | if (ret) |
1401 | genpd_free_dev_data(dev, gpd_data); | |
1402 | else | |
1403 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1404 | |
f721889f RW |
1405 | return ret; |
1406 | } | |
19efa5ff JH |
1407 | |
1408 | /** | |
1a7a6707 | 1409 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1410 | * @genpd: PM domain to add the device to. |
1411 | * @dev: Device to be added. | |
19efa5ff | 1412 | */ |
1a7a6707 | 1413 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1414 | { |
1415 | int ret; | |
1416 | ||
1417 | mutex_lock(&gpd_list_lock); | |
1a7a6707 | 1418 | ret = genpd_add_device(genpd, dev, NULL); |
19efa5ff JH |
1419 | mutex_unlock(&gpd_list_lock); |
1420 | ||
1421 | return ret; | |
1422 | } | |
1a7a6707 | 1423 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1424 | |
85168d56 UH |
1425 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1426 | struct device *dev) | |
f721889f | 1427 | { |
6ff7bb0d | 1428 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1429 | struct pm_domain_data *pdd; |
efa69025 | 1430 | int ret = 0; |
f721889f RW |
1431 | |
1432 | dev_dbg(dev, "%s()\n", __func__); | |
1433 | ||
c0356db7 UH |
1434 | pdd = dev->power.subsys_data->domain_data; |
1435 | gpd_data = to_gpd_data(pdd); | |
1436 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1437 | ||
35241d12 | 1438 | genpd_lock(genpd); |
f721889f | 1439 | |
596ba34b RW |
1440 | if (genpd->prepared_count > 0) { |
1441 | ret = -EAGAIN; | |
1442 | goto out; | |
1443 | } | |
1444 | ||
6ff7bb0d RW |
1445 | genpd->device_count--; |
1446 | genpd->max_off_time_changed = true; | |
1447 | ||
d79b6fe1 | 1448 | if (genpd->detach_dev) |
c16561e8 | 1449 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1450 | |
975e83cf SH |
1451 | dev_pm_domain_set(dev, NULL); |
1452 | ||
efa69025 | 1453 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1454 | |
35241d12 | 1455 | genpd_unlock(genpd); |
6ff7bb0d | 1456 | |
c1dbe2fb | 1457 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1458 | |
6ff7bb0d | 1459 | return 0; |
f721889f | 1460 | |
596ba34b | 1461 | out: |
35241d12 | 1462 | genpd_unlock(genpd); |
c0356db7 | 1463 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1464 | |
1465 | return ret; | |
1466 | } | |
85168d56 UH |
1467 | |
1468 | /** | |
1469 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1470 | * @dev: Device to be removed. |
1471 | */ | |
924f4486 | 1472 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1473 | { |
924f4486 UH |
1474 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1475 | ||
1476 | if (!genpd) | |
85168d56 UH |
1477 | return -EINVAL; |
1478 | ||
1479 | return genpd_remove_device(genpd, dev); | |
1480 | } | |
24c96dc7 | 1481 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1482 | |
19efa5ff JH |
1483 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1484 | struct generic_pm_domain *subdomain) | |
f721889f | 1485 | { |
2547923d | 1486 | struct gpd_link *link, *itr; |
f721889f RW |
1487 | int ret = 0; |
1488 | ||
fb7268be RW |
1489 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1490 | || genpd == subdomain) | |
f721889f RW |
1491 | return -EINVAL; |
1492 | ||
d716f479 LI |
1493 | /* |
1494 | * If the domain can be powered on/off in an IRQ safe | |
1495 | * context, ensure that the subdomain can also be | |
1496 | * powered on/off in that context. | |
1497 | */ | |
1498 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1499 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1500 | genpd->name, subdomain->name); |
1501 | return -EINVAL; | |
1502 | } | |
1503 | ||
2547923d LI |
1504 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1505 | if (!link) | |
1506 | return -ENOMEM; | |
1507 | ||
35241d12 LI |
1508 | genpd_lock(subdomain); |
1509 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1510 | |
41e2c8e0 | 1511 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1512 | ret = -EINVAL; |
1513 | goto out; | |
1514 | } | |
1515 | ||
2547923d LI |
1516 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1517 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1518 | ret = -EINVAL; |
1519 | goto out; | |
1520 | } | |
1521 | } | |
1522 | ||
5063ce15 RW |
1523 | link->master = genpd; |
1524 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1525 | link->slave = subdomain; |
1526 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1527 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1528 | genpd_sd_counter_inc(genpd); |
f721889f | 1529 | |
f721889f | 1530 | out: |
35241d12 LI |
1531 | genpd_unlock(genpd); |
1532 | genpd_unlock(subdomain); | |
2547923d LI |
1533 | if (ret) |
1534 | kfree(link); | |
f721889f RW |
1535 | return ret; |
1536 | } | |
19efa5ff JH |
1537 | |
1538 | /** | |
1539 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1540 | * @genpd: Master PM domain to add the subdomain to. | |
1541 | * @subdomain: Subdomain to be added. | |
1542 | */ | |
1543 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1544 | struct generic_pm_domain *subdomain) | |
1545 | { | |
1546 | int ret; | |
1547 | ||
1548 | mutex_lock(&gpd_list_lock); | |
1549 | ret = genpd_add_subdomain(genpd, subdomain); | |
1550 | mutex_unlock(&gpd_list_lock); | |
1551 | ||
1552 | return ret; | |
1553 | } | |
d60ee966 | 1554 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1555 | |
1556 | /** | |
1557 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1558 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1559 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1560 | */ |
1561 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1562 | struct generic_pm_domain *subdomain) |
f721889f | 1563 | { |
c6e83cac | 1564 | struct gpd_link *l, *link; |
f721889f RW |
1565 | int ret = -EINVAL; |
1566 | ||
5063ce15 | 1567 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1568 | return -EINVAL; |
1569 | ||
35241d12 LI |
1570 | genpd_lock(subdomain); |
1571 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1572 | |
beda5fc1 | 1573 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1574 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1575 | subdomain->name); | |
1576 | ret = -EBUSY; | |
1577 | goto out; | |
1578 | } | |
1579 | ||
c6e83cac | 1580 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1581 | if (link->slave != subdomain) |
f721889f RW |
1582 | continue; |
1583 | ||
5063ce15 RW |
1584 | list_del(&link->master_node); |
1585 | list_del(&link->slave_node); | |
1586 | kfree(link); | |
41e2c8e0 | 1587 | if (genpd_status_on(subdomain)) |
f721889f RW |
1588 | genpd_sd_counter_dec(genpd); |
1589 | ||
f721889f RW |
1590 | ret = 0; |
1591 | break; | |
1592 | } | |
1593 | ||
30e7a65b | 1594 | out: |
35241d12 LI |
1595 | genpd_unlock(genpd); |
1596 | genpd_unlock(subdomain); | |
f721889f RW |
1597 | |
1598 | return ret; | |
1599 | } | |
d60ee966 | 1600 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1601 | |
59d65b73 LI |
1602 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1603 | { | |
1604 | struct genpd_power_state *state; | |
1605 | ||
1606 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1607 | if (!state) | |
1608 | return -ENOMEM; | |
1609 | ||
1610 | genpd->states = state; | |
1611 | genpd->state_count = 1; | |
1612 | genpd->free = state; | |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | ||
d716f479 LI |
1617 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1618 | { | |
1619 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1620 | spin_lock_init(&genpd->slock); | |
1621 | genpd->lock_ops = &genpd_spin_ops; | |
1622 | } else { | |
1623 | mutex_init(&genpd->mlock); | |
1624 | genpd->lock_ops = &genpd_mtx_ops; | |
1625 | } | |
1626 | } | |
1627 | ||
f721889f RW |
1628 | /** |
1629 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1630 | * @genpd: PM domain object to initialize. | |
1631 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1632 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1633 | * |
1634 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1635 | */ |
7eb231c3 UH |
1636 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1637 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1638 | { |
59d65b73 LI |
1639 | int ret; |
1640 | ||
f721889f | 1641 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1642 | return -EINVAL; |
f721889f | 1643 | |
5063ce15 RW |
1644 | INIT_LIST_HEAD(&genpd->master_links); |
1645 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1646 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1647 | genpd_lock_init(genpd); |
f721889f RW |
1648 | genpd->gov = gov; |
1649 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1650 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1651 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1652 | genpd->device_count = 0; |
221e9b58 | 1653 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1654 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1655 | genpd->provider = NULL; |
1656 | genpd->has_provider = false; | |
afece3ab | 1657 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1658 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1659 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1660 | genpd->domain.ops.prepare = genpd_prepare; |
1661 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1662 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1663 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1664 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1665 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1666 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1667 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1668 | |
1669 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1670 | genpd->dev_ops.stop = pm_clk_suspend; | |
1671 | genpd->dev_ops.start = pm_clk_resume; | |
1672 | } | |
1673 | ||
ffaa42e8 UH |
1674 | /* Always-on domains must be powered on at initialization. */ |
1675 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1676 | return -EINVAL; | |
1677 | ||
fc5cbf0c | 1678 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1679 | if (genpd->state_count == 0) { |
1680 | ret = genpd_set_default_power_state(genpd); | |
1681 | if (ret) | |
1682 | return ret; | |
2c9b7f87 UH |
1683 | } else if (!gov) { |
1684 | pr_warn("%s : no governor for states\n", genpd->name); | |
59d65b73 | 1685 | } |
fc5cbf0c | 1686 | |
401ea157 VK |
1687 | device_initialize(&genpd->dev); |
1688 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1689 | ||
5125bbf3 RW |
1690 | mutex_lock(&gpd_list_lock); |
1691 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1692 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1693 | |
1694 | return 0; | |
5125bbf3 | 1695 | } |
be5ed55d | 1696 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1697 | |
3fe57710 JH |
1698 | static int genpd_remove(struct generic_pm_domain *genpd) |
1699 | { | |
1700 | struct gpd_link *l, *link; | |
1701 | ||
1702 | if (IS_ERR_OR_NULL(genpd)) | |
1703 | return -EINVAL; | |
1704 | ||
35241d12 | 1705 | genpd_lock(genpd); |
3fe57710 JH |
1706 | |
1707 | if (genpd->has_provider) { | |
35241d12 | 1708 | genpd_unlock(genpd); |
3fe57710 JH |
1709 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1710 | return -EBUSY; | |
1711 | } | |
1712 | ||
1713 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1714 | genpd_unlock(genpd); |
3fe57710 JH |
1715 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1716 | return -EBUSY; | |
1717 | } | |
1718 | ||
1719 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1720 | list_del(&link->master_node); | |
1721 | list_del(&link->slave_node); | |
1722 | kfree(link); | |
1723 | } | |
1724 | ||
1725 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1726 | genpd_unlock(genpd); |
3fe57710 | 1727 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1728 | kfree(genpd->free); |
3fe57710 JH |
1729 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | /** | |
1735 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1736 | * @genpd: Pointer to PM domain that is to be removed. | |
1737 | * | |
1738 | * To remove the PM domain, this function: | |
1739 | * - Removes the PM domain as a subdomain to any parent domains, | |
1740 | * if it was added. | |
1741 | * - Removes the PM domain from the list of registered PM domains. | |
1742 | * | |
1743 | * The PM domain will only be removed, if the associated provider has | |
1744 | * been removed, it is not a parent to any other PM domain and has no | |
1745 | * devices associated with it. | |
1746 | */ | |
1747 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1748 | { | |
1749 | int ret; | |
1750 | ||
1751 | mutex_lock(&gpd_list_lock); | |
1752 | ret = genpd_remove(genpd); | |
1753 | mutex_unlock(&gpd_list_lock); | |
1754 | ||
1755 | return ret; | |
1756 | } | |
1757 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1758 | ||
aa42240a | 1759 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1760 | |
aa42240a TF |
1761 | /* |
1762 | * Device Tree based PM domain providers. | |
1763 | * | |
1764 | * The code below implements generic device tree based PM domain providers that | |
1765 | * bind device tree nodes with generic PM domains registered in the system. | |
1766 | * | |
1767 | * Any driver that registers generic PM domains and needs to support binding of | |
1768 | * devices to these domains is supposed to register a PM domain provider, which | |
1769 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1770 | * | |
1771 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1772 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1773 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1774 | * index. |
1775 | */ | |
1776 | ||
1777 | /** | |
1778 | * struct of_genpd_provider - PM domain provider registration structure | |
1779 | * @link: Entry in global list of PM domain providers | |
1780 | * @node: Pointer to device tree node of PM domain provider | |
1781 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1782 | * into a PM domain. | |
1783 | * @data: context pointer to be passed into @xlate callback | |
1784 | */ | |
1785 | struct of_genpd_provider { | |
1786 | struct list_head link; | |
1787 | struct device_node *node; | |
1788 | genpd_xlate_t xlate; | |
1789 | void *data; | |
1790 | }; | |
1791 | ||
1792 | /* List of registered PM domain providers. */ | |
1793 | static LIST_HEAD(of_genpd_providers); | |
1794 | /* Mutex to protect the list above. */ | |
1795 | static DEFINE_MUTEX(of_genpd_mutex); | |
1796 | ||
1797 | /** | |
892ebdcc | 1798 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1799 | * @genpdspec: OF phandle args to map into a PM domain |
1800 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1801 | * | |
1802 | * This is a generic xlate function that can be used to model PM domains that | |
1803 | * have their own device tree nodes. The private data of xlate function needs | |
1804 | * to be a valid pointer to struct generic_pm_domain. | |
1805 | */ | |
892ebdcc | 1806 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1807 | struct of_phandle_args *genpdspec, |
1808 | void *data) | |
1809 | { | |
aa42240a TF |
1810 | return data; |
1811 | } | |
aa42240a TF |
1812 | |
1813 | /** | |
892ebdcc | 1814 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1815 | * @genpdspec: OF phandle args to map into a PM domain |
1816 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1817 | * | |
1818 | * This is a generic xlate function that can be used to model simple PM domain | |
1819 | * controllers that have one device tree node and provide multiple PM domains. | |
1820 | * A single cell is used as an index into an array of PM domains specified in | |
1821 | * the genpd_onecell_data struct when registering the provider. | |
1822 | */ | |
892ebdcc | 1823 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1824 | struct of_phandle_args *genpdspec, |
1825 | void *data) | |
1826 | { | |
1827 | struct genpd_onecell_data *genpd_data = data; | |
1828 | unsigned int idx = genpdspec->args[0]; | |
1829 | ||
1830 | if (genpdspec->args_count != 1) | |
1831 | return ERR_PTR(-EINVAL); | |
1832 | ||
1833 | if (idx >= genpd_data->num_domains) { | |
1834 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1835 | return ERR_PTR(-EINVAL); | |
1836 | } | |
1837 | ||
1838 | if (!genpd_data->domains[idx]) | |
1839 | return ERR_PTR(-ENOENT); | |
1840 | ||
1841 | return genpd_data->domains[idx]; | |
1842 | } | |
aa42240a TF |
1843 | |
1844 | /** | |
892ebdcc | 1845 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1846 | * @np: Device node pointer associated with the PM domain provider. |
1847 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1848 | * @data: Context pointer for @xlate callback. | |
1849 | */ | |
892ebdcc JH |
1850 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1851 | void *data) | |
aa42240a TF |
1852 | { |
1853 | struct of_genpd_provider *cp; | |
1854 | ||
1855 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1856 | if (!cp) | |
1857 | return -ENOMEM; | |
1858 | ||
1859 | cp->node = of_node_get(np); | |
1860 | cp->data = data; | |
1861 | cp->xlate = xlate; | |
1862 | ||
1863 | mutex_lock(&of_genpd_mutex); | |
1864 | list_add(&cp->link, &of_genpd_providers); | |
1865 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1866 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1867 | |
1868 | return 0; | |
1869 | } | |
892ebdcc JH |
1870 | |
1871 | /** | |
1872 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1873 | * @np: Device node pointer associated with the PM domain provider. | |
1874 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1875 | */ | |
1876 | int of_genpd_add_provider_simple(struct device_node *np, | |
1877 | struct generic_pm_domain *genpd) | |
1878 | { | |
0159ec67 JH |
1879 | int ret = -EINVAL; |
1880 | ||
1881 | if (!np || !genpd) | |
1882 | return -EINVAL; | |
1883 | ||
1884 | mutex_lock(&gpd_list_lock); | |
1885 | ||
6a0ae73d VK |
1886 | if (!genpd_present(genpd)) |
1887 | goto unlock; | |
1888 | ||
1889 | genpd->dev.of_node = np; | |
1890 | ||
1891 | /* Parse genpd OPP table */ | |
1892 | if (genpd->set_performance_state) { | |
1893 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
1894 | if (ret) { | |
1895 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
1896 | ret); | |
1897 | goto unlock; | |
8ce95844 | 1898 | } |
de0aa06d JH |
1899 | } |
1900 | ||
6a0ae73d VK |
1901 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
1902 | if (ret) { | |
1903 | if (genpd->set_performance_state) | |
1904 | dev_pm_opp_of_remove_table(&genpd->dev); | |
1905 | ||
1906 | goto unlock; | |
1907 | } | |
1908 | ||
1909 | genpd->provider = &np->fwnode; | |
1910 | genpd->has_provider = true; | |
1911 | ||
1912 | unlock: | |
0159ec67 JH |
1913 | mutex_unlock(&gpd_list_lock); |
1914 | ||
1915 | return ret; | |
892ebdcc JH |
1916 | } |
1917 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1918 | ||
1919 | /** | |
1920 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1921 | * @np: Device node pointer associated with the PM domain provider. | |
1922 | * @data: Pointer to the data associated with the PM domain provider. | |
1923 | */ | |
1924 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1925 | struct genpd_onecell_data *data) | |
1926 | { | |
6a0ae73d | 1927 | struct generic_pm_domain *genpd; |
0159ec67 | 1928 | unsigned int i; |
de0aa06d | 1929 | int ret = -EINVAL; |
0159ec67 JH |
1930 | |
1931 | if (!np || !data) | |
1932 | return -EINVAL; | |
1933 | ||
1934 | mutex_lock(&gpd_list_lock); | |
1935 | ||
40845524 TR |
1936 | if (!data->xlate) |
1937 | data->xlate = genpd_xlate_onecell; | |
1938 | ||
0159ec67 | 1939 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
1940 | genpd = data->domains[i]; |
1941 | ||
1942 | if (!genpd) | |
609bed67 | 1943 | continue; |
6a0ae73d | 1944 | if (!genpd_present(genpd)) |
de0aa06d JH |
1945 | goto error; |
1946 | ||
6a0ae73d VK |
1947 | genpd->dev.of_node = np; |
1948 | ||
1949 | /* Parse genpd OPP table */ | |
1950 | if (genpd->set_performance_state) { | |
1951 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
1952 | if (ret) { | |
1953 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
1954 | i, ret); | |
1955 | goto error; | |
1956 | } | |
1957 | } | |
1958 | ||
1959 | genpd->provider = &np->fwnode; | |
1960 | genpd->has_provider = true; | |
0159ec67 JH |
1961 | } |
1962 | ||
40845524 | 1963 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
1964 | if (ret < 0) |
1965 | goto error; | |
1966 | ||
1967 | mutex_unlock(&gpd_list_lock); | |
1968 | ||
1969 | return 0; | |
1970 | ||
1971 | error: | |
1972 | while (i--) { | |
6a0ae73d VK |
1973 | genpd = data->domains[i]; |
1974 | ||
1975 | if (!genpd) | |
609bed67 | 1976 | continue; |
6a0ae73d VK |
1977 | |
1978 | genpd->provider = NULL; | |
1979 | genpd->has_provider = false; | |
1980 | ||
1981 | if (genpd->set_performance_state) | |
1982 | dev_pm_opp_of_remove_table(&genpd->dev); | |
de0aa06d | 1983 | } |
0159ec67 JH |
1984 | |
1985 | mutex_unlock(&gpd_list_lock); | |
1986 | ||
1987 | return ret; | |
892ebdcc JH |
1988 | } |
1989 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
1990 | |
1991 | /** | |
1992 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1993 | * @np: Device node pointer associated with the PM domain provider | |
1994 | */ | |
1995 | void of_genpd_del_provider(struct device_node *np) | |
1996 | { | |
b556b15d | 1997 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 1998 | struct generic_pm_domain *gpd; |
aa42240a | 1999 | |
de0aa06d | 2000 | mutex_lock(&gpd_list_lock); |
aa42240a | 2001 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2002 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2003 | if (cp->node == np) { |
de0aa06d JH |
2004 | /* |
2005 | * For each PM domain associated with the | |
2006 | * provider, set the 'has_provider' to false | |
2007 | * so that the PM domain can be safely removed. | |
2008 | */ | |
6a0ae73d VK |
2009 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2010 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2011 | gpd->has_provider = false; |
2012 | ||
6a0ae73d VK |
2013 | if (!gpd->set_performance_state) |
2014 | continue; | |
2015 | ||
2016 | dev_pm_opp_of_remove_table(&gpd->dev); | |
2017 | } | |
2018 | } | |
2019 | ||
aa42240a TF |
2020 | list_del(&cp->link); |
2021 | of_node_put(cp->node); | |
2022 | kfree(cp); | |
2023 | break; | |
2024 | } | |
2025 | } | |
2026 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2027 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2028 | } |
2029 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2030 | ||
2031 | /** | |
f58d4e5a | 2032 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2033 | * @genpdspec: OF phandle args to use for look-up |
2034 | * | |
2035 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2036 | * found, uses xlate function of the provider to map phandle args to a PM | |
2037 | * domain. | |
2038 | * | |
2039 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2040 | * on failure. | |
2041 | */ | |
f58d4e5a | 2042 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2043 | struct of_phandle_args *genpdspec) |
2044 | { | |
2045 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2046 | struct of_genpd_provider *provider; | |
2047 | ||
41795a8a JH |
2048 | if (!genpdspec) |
2049 | return ERR_PTR(-EINVAL); | |
2050 | ||
aa42240a TF |
2051 | mutex_lock(&of_genpd_mutex); |
2052 | ||
2053 | /* Check if we have such a provider in our array */ | |
2054 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2055 | if (provider->node == genpdspec->np) | |
2056 | genpd = provider->xlate(genpdspec, provider->data); | |
2057 | if (!IS_ERR(genpd)) | |
2058 | break; | |
2059 | } | |
2060 | ||
2061 | mutex_unlock(&of_genpd_mutex); | |
2062 | ||
2063 | return genpd; | |
2064 | } | |
2065 | ||
ec69572b JH |
2066 | /** |
2067 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2068 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2069 | * @dev: Device to be added. | |
2070 | * | |
2071 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2072 | * the device to the PM domain. Returns a negative error code on failure. | |
2073 | */ | |
2074 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2075 | { | |
2076 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2077 | int ret; |
2078 | ||
2079 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2080 | |
f58d4e5a | 2081 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2082 | if (IS_ERR(genpd)) { |
2083 | ret = PTR_ERR(genpd); | |
2084 | goto out; | |
2085 | } | |
2086 | ||
2087 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 2088 | |
19efa5ff JH |
2089 | out: |
2090 | mutex_unlock(&gpd_list_lock); | |
2091 | ||
2092 | return ret; | |
ec69572b JH |
2093 | } |
2094 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2095 | ||
2096 | /** | |
2097 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2098 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2099 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2100 | * | |
2101 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2102 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2103 | * negative error code on failure. | |
2104 | */ | |
2105 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2106 | struct of_phandle_args *subdomain_spec) | |
2107 | { | |
2108 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2109 | int ret; |
2110 | ||
2111 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2112 | |
f58d4e5a | 2113 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2114 | if (IS_ERR(parent)) { |
2115 | ret = PTR_ERR(parent); | |
2116 | goto out; | |
2117 | } | |
ec69572b | 2118 | |
f58d4e5a | 2119 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2120 | if (IS_ERR(subdomain)) { |
2121 | ret = PTR_ERR(subdomain); | |
2122 | goto out; | |
2123 | } | |
2124 | ||
2125 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2126 | |
19efa5ff JH |
2127 | out: |
2128 | mutex_unlock(&gpd_list_lock); | |
2129 | ||
2130 | return ret; | |
ec69572b JH |
2131 | } |
2132 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2133 | ||
17926551 JH |
2134 | /** |
2135 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2136 | * @provider: Pointer to device structure associated with provider | |
2137 | * | |
2138 | * Find the last PM domain that was added by a particular provider and | |
2139 | * remove this PM domain from the list of PM domains. The provider is | |
2140 | * identified by the 'provider' device structure that is passed. The PM | |
2141 | * domain will only be removed, if the provider associated with domain | |
2142 | * has been removed. | |
2143 | * | |
2144 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2145 | * ERR_PTR() on failure. | |
2146 | */ | |
2147 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2148 | { | |
a7e2d1bc | 2149 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2150 | int ret; |
2151 | ||
2152 | if (IS_ERR_OR_NULL(np)) | |
2153 | return ERR_PTR(-EINVAL); | |
2154 | ||
2155 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2156 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2157 | if (gpd->provider == &np->fwnode) { |
2158 | ret = genpd_remove(gpd); | |
2159 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2160 | break; | |
2161 | } | |
2162 | } | |
2163 | mutex_unlock(&gpd_list_lock); | |
2164 | ||
2165 | return genpd; | |
2166 | } | |
2167 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2168 | ||
3c095f32 UH |
2169 | static void genpd_release_dev(struct device *dev) |
2170 | { | |
2171 | kfree(dev); | |
2172 | } | |
2173 | ||
2174 | static struct bus_type genpd_bus_type = { | |
2175 | .name = "genpd", | |
2176 | }; | |
2177 | ||
aa42240a TF |
2178 | /** |
2179 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2180 | * @dev: Device to detach. |
aa42240a TF |
2181 | * @power_off: Currently not used |
2182 | * | |
2183 | * Try to locate a corresponding generic PM domain, which the device was | |
2184 | * attached to previously. If such is found, the device is detached from it. | |
2185 | */ | |
2186 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2187 | { | |
446d999c | 2188 | struct generic_pm_domain *pd; |
93af5e93 | 2189 | unsigned int i; |
aa42240a TF |
2190 | int ret = 0; |
2191 | ||
85168d56 UH |
2192 | pd = dev_to_genpd(dev); |
2193 | if (IS_ERR(pd)) | |
aa42240a TF |
2194 | return; |
2195 | ||
2196 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2197 | ||
93af5e93 | 2198 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2199 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2200 | if (ret != -EAGAIN) |
2201 | break; | |
93af5e93 GU |
2202 | |
2203 | mdelay(i); | |
aa42240a TF |
2204 | cond_resched(); |
2205 | } | |
2206 | ||
2207 | if (ret < 0) { | |
2208 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2209 | pd->name, ret); | |
2210 | return; | |
2211 | } | |
2212 | ||
2213 | /* Check if PM domain can be powered off after removing this device. */ | |
2214 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2215 | |
2216 | /* Unregister the device if it was created by genpd. */ | |
2217 | if (dev->bus == &genpd_bus_type) | |
2218 | device_unregister(dev); | |
aa42240a TF |
2219 | } |
2220 | ||
632f7ce3 RK |
2221 | static void genpd_dev_pm_sync(struct device *dev) |
2222 | { | |
2223 | struct generic_pm_domain *pd; | |
2224 | ||
2225 | pd = dev_to_genpd(dev); | |
2226 | if (IS_ERR(pd)) | |
2227 | return; | |
2228 | ||
2229 | genpd_queue_power_off_work(pd); | |
2230 | } | |
2231 | ||
8cb1cbd6 | 2232 | static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np, |
895b6612 | 2233 | unsigned int index, bool power_on) |
aa42240a TF |
2234 | { |
2235 | struct of_phandle_args pd_args; | |
2236 | struct generic_pm_domain *pd; | |
2237 | int ret; | |
2238 | ||
8cb1cbd6 UH |
2239 | ret = of_parse_phandle_with_args(np, "power-domains", |
2240 | "#power-domain-cells", index, &pd_args); | |
001d50c9 | 2241 | if (ret < 0) |
bcd931f2 | 2242 | return ret; |
aa42240a | 2243 | |
19efa5ff | 2244 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2245 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2246 | of_node_put(pd_args.np); |
aa42240a | 2247 | if (IS_ERR(pd)) { |
19efa5ff | 2248 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2249 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2250 | __func__, PTR_ERR(pd)); | |
e01afc32 | 2251 | return driver_deferred_probe_check_state(dev); |
aa42240a TF |
2252 | } |
2253 | ||
2254 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2255 | ||
b56d9c91 | 2256 | ret = genpd_add_device(pd, dev, NULL); |
19efa5ff | 2257 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2258 | |
2259 | if (ret < 0) { | |
34994692 GU |
2260 | if (ret != -EPROBE_DEFER) |
2261 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2262 | pd->name, ret); | |
919b7308 | 2263 | return ret; |
aa42240a TF |
2264 | } |
2265 | ||
2266 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2267 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2268 | |
895b6612 UH |
2269 | if (power_on) { |
2270 | genpd_lock(pd); | |
2271 | ret = genpd_power_on(pd, 0); | |
2272 | genpd_unlock(pd); | |
2273 | } | |
72038df3 UH |
2274 | |
2275 | if (ret) | |
2276 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2277 | |
2278 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2279 | } |
8cb1cbd6 UH |
2280 | |
2281 | /** | |
2282 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2283 | * @dev: Device to attach. | |
2284 | * | |
2285 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2286 | * attaches the device to retrieved pm_domain ops. | |
2287 | * | |
2288 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2289 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2290 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2291 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2292 | * not probed and to re-try again later. | |
2293 | */ | |
2294 | int genpd_dev_pm_attach(struct device *dev) | |
2295 | { | |
2296 | if (!dev->of_node) | |
2297 | return 0; | |
2298 | ||
2299 | /* | |
2300 | * Devices with multiple PM domains must be attached separately, as we | |
2301 | * can only attach one PM domain per device. | |
2302 | */ | |
2303 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2304 | "#power-domain-cells") != 1) | |
2305 | return 0; | |
2306 | ||
895b6612 | 2307 | return __genpd_dev_pm_attach(dev, dev->of_node, 0, true); |
8cb1cbd6 | 2308 | } |
aa42240a | 2309 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2310 | |
3c095f32 UH |
2311 | /** |
2312 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2313 | * @dev: The device used to lookup the PM domain. | |
2314 | * @index: The index of the PM domain. | |
2315 | * | |
2316 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2317 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2318 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2319 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2320 | * | |
2321 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2322 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2323 | * failures. If a power-domain exists for the device, but cannot be found or | |
2324 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2325 | * is not probed and to re-try again later. | |
2326 | */ | |
2327 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2328 | unsigned int index) | |
2329 | { | |
560928b2 | 2330 | struct device *virt_dev; |
3c095f32 UH |
2331 | int num_domains; |
2332 | int ret; | |
2333 | ||
2334 | if (!dev->of_node) | |
2335 | return NULL; | |
2336 | ||
2337 | /* Deal only with devices using multiple PM domains. */ | |
2338 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", | |
2339 | "#power-domain-cells"); | |
2340 | if (num_domains < 2 || index >= num_domains) | |
2341 | return NULL; | |
2342 | ||
2343 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2344 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2345 | if (!virt_dev) | |
3c095f32 UH |
2346 | return ERR_PTR(-ENOMEM); |
2347 | ||
560928b2 VK |
2348 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2349 | virt_dev->bus = &genpd_bus_type; | |
2350 | virt_dev->release = genpd_release_dev; | |
3c095f32 | 2351 | |
560928b2 | 2352 | ret = device_register(virt_dev); |
3c095f32 | 2353 | if (ret) { |
560928b2 | 2354 | kfree(virt_dev); |
3c095f32 UH |
2355 | return ERR_PTR(ret); |
2356 | } | |
2357 | ||
2358 | /* Try to attach the device to the PM domain at the specified index. */ | |
560928b2 | 2359 | ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false); |
3c095f32 | 2360 | if (ret < 1) { |
560928b2 | 2361 | device_unregister(virt_dev); |
3c095f32 UH |
2362 | return ret ? ERR_PTR(ret) : NULL; |
2363 | } | |
2364 | ||
560928b2 VK |
2365 | pm_runtime_enable(virt_dev); |
2366 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2367 | |
560928b2 | 2368 | return virt_dev; |
3c095f32 UH |
2369 | } |
2370 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2371 | ||
5d6be70a UH |
2372 | /** |
2373 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2374 | * @dev: The device used to lookup the PM domain. | |
2375 | * @name: The name of the PM domain. | |
2376 | * | |
2377 | * Parse device's OF node to find a PM domain specifier using the | |
2378 | * power-domain-names DT property. For further description see | |
2379 | * genpd_dev_pm_attach_by_id(). | |
2380 | */ | |
2381 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, char *name) | |
2382 | { | |
2383 | int index; | |
2384 | ||
2385 | if (!dev->of_node) | |
2386 | return NULL; | |
2387 | ||
2388 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2389 | name); | |
2390 | if (index < 0) | |
2391 | return NULL; | |
2392 | ||
2393 | return genpd_dev_pm_attach_by_id(dev, index); | |
2394 | } | |
2395 | ||
30f60428 | 2396 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2397 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2398 | { } |
2399 | }; | |
2400 | ||
2401 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2402 | struct device_node *state_node) | |
2403 | { | |
2404 | int err; | |
2405 | u32 residency; | |
2406 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2407 | |
2408 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2409 | &entry_latency); | |
2410 | if (err) { | |
ea11e94b RH |
2411 | pr_debug(" * %pOF missing entry-latency-us property\n", |
2412 | state_node); | |
30f60428 LI |
2413 | return -EINVAL; |
2414 | } | |
2415 | ||
2416 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2417 | &exit_latency); | |
2418 | if (err) { | |
ea11e94b RH |
2419 | pr_debug(" * %pOF missing exit-latency-us property\n", |
2420 | state_node); | |
30f60428 LI |
2421 | return -EINVAL; |
2422 | } | |
2423 | ||
2424 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2425 | if (!err) | |
2426 | genpd_state->residency_ns = 1000 * residency; | |
2427 | ||
2428 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2429 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2430 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2431 | |
2432 | return 0; | |
2433 | } | |
2434 | ||
a3381e3a UH |
2435 | static int genpd_iterate_idle_states(struct device_node *dn, |
2436 | struct genpd_power_state *states) | |
2437 | { | |
2438 | int ret; | |
2439 | struct of_phandle_iterator it; | |
2440 | struct device_node *np; | |
2441 | int i = 0; | |
2442 | ||
2443 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2444 | if (ret <= 0) | |
2445 | return ret; | |
2446 | ||
2447 | /* Loop over the phandles until all the requested entry is found */ | |
2448 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2449 | np = it.node; | |
2450 | if (!of_match_node(idle_state_match, np)) | |
2451 | continue; | |
2452 | if (states) { | |
2453 | ret = genpd_parse_state(&states[i], np); | |
2454 | if (ret) { | |
2455 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2456 | np, ret); | |
2457 | of_node_put(np); | |
2458 | return ret; | |
2459 | } | |
2460 | } | |
2461 | i++; | |
2462 | } | |
2463 | ||
2464 | return i; | |
2465 | } | |
2466 | ||
30f60428 LI |
2467 | /** |
2468 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2469 | * | |
2470 | * @dn: The genpd device node | |
2471 | * @states: The pointer to which the state array will be saved. | |
2472 | * @n: The count of elements in the array returned from this function. | |
2473 | * | |
2474 | * Returns the device states parsed from the OF node. The memory for the states | |
2475 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2476 | * free the memory after use. If any or zero compatible domain idle states is |
2477 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2478 | */ |
2479 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2480 | struct genpd_power_state **states, int *n) | |
2481 | { | |
2482 | struct genpd_power_state *st; | |
a3381e3a | 2483 | int ret; |
30f60428 | 2484 | |
a3381e3a | 2485 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2486 | if (ret < 0) |
2487 | return ret; | |
2488 | ||
2489 | if (!ret) { | |
2490 | *states = NULL; | |
2491 | *n = 0; | |
2492 | return 0; | |
2493 | } | |
30f60428 | 2494 | |
a3381e3a | 2495 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2496 | if (!st) |
2497 | return -ENOMEM; | |
2498 | ||
a3381e3a UH |
2499 | ret = genpd_iterate_idle_states(dn, st); |
2500 | if (ret <= 0) { | |
2501 | kfree(st); | |
2502 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2503 | } |
2504 | ||
a3381e3a UH |
2505 | *states = st; |
2506 | *n = ret; | |
30f60428 LI |
2507 | |
2508 | return 0; | |
2509 | } | |
2510 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2511 | ||
e38f89d3 VK |
2512 | /** |
2513 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2514 | * | |
2515 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2516 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2517 | * state. | |
2518 | * | |
2519 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2520 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2521 | * power domain OPP to performance state. | |
2522 | * | |
2523 | * Returns performance state on success and 0 on failure. | |
2524 | */ | |
2525 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2526 | struct dev_pm_opp *opp) | |
2527 | { | |
2528 | struct generic_pm_domain *genpd = NULL; | |
2529 | int state; | |
2530 | ||
2531 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2532 | ||
2533 | if (unlikely(!genpd->opp_to_performance_state)) | |
2534 | return 0; | |
2535 | ||
2536 | genpd_lock(genpd); | |
2537 | state = genpd->opp_to_performance_state(genpd, opp); | |
2538 | genpd_unlock(genpd); | |
2539 | ||
2540 | return state; | |
2541 | } | |
2542 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2543 | ||
3c095f32 UH |
2544 | static int __init genpd_bus_init(void) |
2545 | { | |
2546 | return bus_register(&genpd_bus_type); | |
2547 | } | |
2548 | core_initcall(genpd_bus_init); | |
2549 | ||
d30d819d | 2550 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2551 | |
2552 | ||
2553 | /*** debugfs support ***/ | |
2554 | ||
8b0510b5 | 2555 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2556 | #include <linux/pm.h> |
2557 | #include <linux/device.h> | |
2558 | #include <linux/debugfs.h> | |
2559 | #include <linux/seq_file.h> | |
2560 | #include <linux/init.h> | |
2561 | #include <linux/kobject.h> | |
9e9704ea | 2562 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2563 | |
2564 | /* | |
2565 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2566 | * from sysfs.c, so generalize it. |
2bd5306a | 2567 | */ |
2bd5306a MM |
2568 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2569 | { | |
2570 | static const char * const status_lookup[] = { | |
2571 | [RPM_ACTIVE] = "active", | |
2572 | [RPM_RESUMING] = "resuming", | |
2573 | [RPM_SUSPENDED] = "suspended", | |
2574 | [RPM_SUSPENDING] = "suspending" | |
2575 | }; | |
2576 | const char *p = ""; | |
2577 | ||
2578 | if (dev->power.runtime_error) | |
2579 | p = "error"; | |
2580 | else if (dev->power.disable_depth) | |
2581 | p = "unsupported"; | |
2582 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2583 | p = status_lookup[dev->power.runtime_status]; | |
2584 | else | |
2585 | WARN_ON(1); | |
2586 | ||
2587 | seq_puts(s, p); | |
2588 | } | |
2bd5306a | 2589 | |
9e9704ea UH |
2590 | static int genpd_summary_one(struct seq_file *s, |
2591 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2592 | { |
2593 | static const char * const status_lookup[] = { | |
2594 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2595 | [GPD_STATE_POWER_OFF] = "off" |
2596 | }; | |
2597 | struct pm_domain_data *pm_data; | |
2598 | const char *kobj_path; | |
2599 | struct gpd_link *link; | |
6954d432 | 2600 | char state[16]; |
2bd5306a MM |
2601 | int ret; |
2602 | ||
35241d12 | 2603 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2604 | if (ret) |
2605 | return -ERESTARTSYS; | |
2606 | ||
66a5ca4b | 2607 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2608 | goto exit; |
41e2c8e0 | 2609 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2610 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2611 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2612 | else |
6954d432 GU |
2613 | snprintf(state, sizeof(state), "%s", |
2614 | status_lookup[genpd->status]); | |
2615 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2616 | |
2617 | /* | |
2618 | * Modifications on the list require holding locks on both | |
2619 | * master and slave, so we are safe. | |
66a5ca4b | 2620 | * Also genpd->name is immutable. |
2bd5306a | 2621 | */ |
66a5ca4b | 2622 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2623 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2624 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2625 | seq_puts(s, ", "); |
2626 | } | |
2627 | ||
66a5ca4b | 2628 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2629 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2630 | genpd_is_irq_safe(genpd) ? | |
2631 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2632 | if (kobj_path == NULL) |
2633 | continue; | |
2634 | ||
2635 | seq_printf(s, "\n %-50s ", kobj_path); | |
2636 | rtpm_status_str(s, pm_data->dev); | |
2637 | kfree(kobj_path); | |
2638 | } | |
2639 | ||
2640 | seq_puts(s, "\n"); | |
2641 | exit: | |
35241d12 | 2642 | genpd_unlock(genpd); |
2bd5306a MM |
2643 | |
2644 | return 0; | |
2645 | } | |
2646 | ||
b6a1d093 | 2647 | static int genpd_summary_show(struct seq_file *s, void *data) |
2bd5306a | 2648 | { |
66a5ca4b | 2649 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2650 | int ret = 0; |
2651 | ||
15dec67a GU |
2652 | seq_puts(s, "domain status slaves\n"); |
2653 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2654 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2655 | ||
2656 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2657 | if (ret) | |
2658 | return -ERESTARTSYS; | |
2659 | ||
66a5ca4b | 2660 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2661 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2662 | if (ret) |
2663 | break; | |
2664 | } | |
2665 | mutex_unlock(&gpd_list_lock); | |
2666 | ||
2667 | return ret; | |
2668 | } | |
2669 | ||
b6a1d093 | 2670 | static int genpd_status_show(struct seq_file *s, void *data) |
2bd5306a | 2671 | { |
b6a1d093 TG |
2672 | static const char * const status_lookup[] = { |
2673 | [GPD_STATE_ACTIVE] = "on", | |
2674 | [GPD_STATE_POWER_OFF] = "off" | |
2675 | }; | |
2676 | ||
2677 | struct generic_pm_domain *genpd = s->private; | |
2678 | int ret = 0; | |
2679 | ||
2680 | ret = genpd_lock_interruptible(genpd); | |
2681 | if (ret) | |
2682 | return -ERESTARTSYS; | |
2683 | ||
2684 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2685 | goto exit; | |
2686 | ||
2687 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2688 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2689 | genpd->state_idx); | |
2690 | else | |
2691 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2692 | exit: | |
2693 | genpd_unlock(genpd); | |
2694 | return ret; | |
2bd5306a MM |
2695 | } |
2696 | ||
b6a1d093 TG |
2697 | static int genpd_sub_domains_show(struct seq_file *s, void *data) |
2698 | { | |
2699 | struct generic_pm_domain *genpd = s->private; | |
2700 | struct gpd_link *link; | |
2701 | int ret = 0; | |
2702 | ||
2703 | ret = genpd_lock_interruptible(genpd); | |
2704 | if (ret) | |
2705 | return -ERESTARTSYS; | |
2706 | ||
2707 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2708 | seq_printf(s, "%s\n", link->slave->name); | |
2709 | ||
2710 | genpd_unlock(genpd); | |
2711 | return ret; | |
2712 | } | |
2713 | ||
2714 | static int genpd_idle_states_show(struct seq_file *s, void *data) | |
2715 | { | |
2716 | struct generic_pm_domain *genpd = s->private; | |
2717 | unsigned int i; | |
2718 | int ret = 0; | |
2719 | ||
2720 | ret = genpd_lock_interruptible(genpd); | |
2721 | if (ret) | |
2722 | return -ERESTARTSYS; | |
2723 | ||
2724 | seq_puts(s, "State Time Spent(ms)\n"); | |
2725 | ||
2726 | for (i = 0; i < genpd->state_count; i++) { | |
2727 | ktime_t delta = 0; | |
2728 | s64 msecs; | |
2729 | ||
2730 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2731 | (genpd->state_idx == i)) | |
2732 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2733 | ||
2734 | msecs = ktime_to_ms( | |
2735 | ktime_add(genpd->states[i].idle_time, delta)); | |
2736 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2737 | } | |
2738 | ||
2739 | genpd_unlock(genpd); | |
2740 | return ret; | |
2741 | } | |
2742 | ||
2743 | static int genpd_active_time_show(struct seq_file *s, void *data) | |
2744 | { | |
2745 | struct generic_pm_domain *genpd = s->private; | |
2746 | ktime_t delta = 0; | |
2747 | int ret = 0; | |
2748 | ||
2749 | ret = genpd_lock_interruptible(genpd); | |
2750 | if (ret) | |
2751 | return -ERESTARTSYS; | |
2752 | ||
2753 | if (genpd->status == GPD_STATE_ACTIVE) | |
2754 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2755 | ||
2756 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2757 | ktime_add(genpd->on_time, delta))); | |
2758 | ||
2759 | genpd_unlock(genpd); | |
2760 | return ret; | |
2761 | } | |
2762 | ||
2763 | static int genpd_total_idle_time_show(struct seq_file *s, void *data) | |
2764 | { | |
2765 | struct generic_pm_domain *genpd = s->private; | |
2766 | ktime_t delta = 0, total = 0; | |
2767 | unsigned int i; | |
2768 | int ret = 0; | |
2769 | ||
2770 | ret = genpd_lock_interruptible(genpd); | |
2771 | if (ret) | |
2772 | return -ERESTARTSYS; | |
2773 | ||
2774 | for (i = 0; i < genpd->state_count; i++) { | |
2775 | ||
2776 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2777 | (genpd->state_idx == i)) | |
2778 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2779 | ||
2780 | total = ktime_add(total, genpd->states[i].idle_time); | |
2781 | } | |
2782 | total = ktime_add(total, delta); | |
2783 | ||
2784 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2785 | ||
2786 | genpd_unlock(genpd); | |
2787 | return ret; | |
2788 | } | |
2789 | ||
2790 | ||
2791 | static int genpd_devices_show(struct seq_file *s, void *data) | |
2792 | { | |
2793 | struct generic_pm_domain *genpd = s->private; | |
2794 | struct pm_domain_data *pm_data; | |
2795 | const char *kobj_path; | |
2796 | int ret = 0; | |
2797 | ||
2798 | ret = genpd_lock_interruptible(genpd); | |
2799 | if (ret) | |
2800 | return -ERESTARTSYS; | |
2801 | ||
2802 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2803 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2804 | genpd_is_irq_safe(genpd) ? | |
2805 | GFP_ATOMIC : GFP_KERNEL); | |
2806 | if (kobj_path == NULL) | |
2807 | continue; | |
2808 | ||
2809 | seq_printf(s, "%s\n", kobj_path); | |
2810 | kfree(kobj_path); | |
2811 | } | |
2812 | ||
2813 | genpd_unlock(genpd); | |
2814 | return ret; | |
2815 | } | |
2816 | ||
e8912812 RN |
2817 | static int genpd_perf_state_show(struct seq_file *s, void *data) |
2818 | { | |
2819 | struct generic_pm_domain *genpd = s->private; | |
2820 | ||
2821 | if (genpd_lock_interruptible(genpd)) | |
2822 | return -ERESTARTSYS; | |
2823 | ||
2824 | seq_printf(s, "%u\n", genpd->performance_state); | |
2825 | ||
2826 | genpd_unlock(genpd); | |
2827 | return 0; | |
2828 | } | |
2829 | ||
b6a1d093 TG |
2830 | #define define_genpd_open_function(name) \ |
2831 | static int genpd_##name##_open(struct inode *inode, struct file *file) \ | |
2832 | { \ | |
2833 | return single_open(file, genpd_##name##_show, inode->i_private); \ | |
2834 | } | |
2835 | ||
2836 | define_genpd_open_function(summary); | |
2837 | define_genpd_open_function(status); | |
2838 | define_genpd_open_function(sub_domains); | |
2839 | define_genpd_open_function(idle_states); | |
2840 | define_genpd_open_function(active_time); | |
2841 | define_genpd_open_function(total_idle_time); | |
2842 | define_genpd_open_function(devices); | |
e8912812 | 2843 | define_genpd_open_function(perf_state); |
b6a1d093 TG |
2844 | |
2845 | #define define_genpd_debugfs_fops(name) \ | |
2846 | static const struct file_operations genpd_##name##_fops = { \ | |
2847 | .open = genpd_##name##_open, \ | |
2848 | .read = seq_read, \ | |
2849 | .llseek = seq_lseek, \ | |
2850 | .release = single_release, \ | |
2851 | } | |
2852 | ||
2853 | define_genpd_debugfs_fops(summary); | |
2854 | define_genpd_debugfs_fops(status); | |
2855 | define_genpd_debugfs_fops(sub_domains); | |
2856 | define_genpd_debugfs_fops(idle_states); | |
2857 | define_genpd_debugfs_fops(active_time); | |
2858 | define_genpd_debugfs_fops(total_idle_time); | |
2859 | define_genpd_debugfs_fops(devices); | |
e8912812 | 2860 | define_genpd_debugfs_fops(perf_state); |
2bd5306a | 2861 | |
9e9704ea | 2862 | static int __init genpd_debug_init(void) |
2bd5306a MM |
2863 | { |
2864 | struct dentry *d; | |
b6a1d093 | 2865 | struct generic_pm_domain *genpd; |
2bd5306a | 2866 | |
9e9704ea | 2867 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 2868 | |
9e9704ea | 2869 | if (!genpd_debugfs_dir) |
2bd5306a MM |
2870 | return -ENOMEM; |
2871 | ||
2872 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
9e9704ea | 2873 | genpd_debugfs_dir, NULL, &genpd_summary_fops); |
2bd5306a MM |
2874 | if (!d) |
2875 | return -ENOMEM; | |
2876 | ||
b6a1d093 | 2877 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2878 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
2879 | if (!d) |
2880 | return -ENOMEM; | |
2881 | ||
2882 | debugfs_create_file("current_state", 0444, | |
2883 | d, genpd, &genpd_status_fops); | |
2884 | debugfs_create_file("sub_domains", 0444, | |
2885 | d, genpd, &genpd_sub_domains_fops); | |
2886 | debugfs_create_file("idle_states", 0444, | |
2887 | d, genpd, &genpd_idle_states_fops); | |
2888 | debugfs_create_file("active_time", 0444, | |
2889 | d, genpd, &genpd_active_time_fops); | |
2890 | debugfs_create_file("total_idle_time", 0444, | |
2891 | d, genpd, &genpd_total_idle_time_fops); | |
2892 | debugfs_create_file("devices", 0444, | |
2893 | d, genpd, &genpd_devices_fops); | |
e8912812 RN |
2894 | if (genpd->set_performance_state) |
2895 | debugfs_create_file("perf_state", 0444, | |
2896 | d, genpd, &genpd_perf_state_fops); | |
b6a1d093 TG |
2897 | } |
2898 | ||
2bd5306a MM |
2899 | return 0; |
2900 | } | |
9e9704ea | 2901 | late_initcall(genpd_debug_init); |
2bd5306a | 2902 | |
9e9704ea | 2903 | static void __exit genpd_debug_exit(void) |
2bd5306a | 2904 | { |
9e9704ea | 2905 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 2906 | } |
9e9704ea | 2907 | __exitcall(genpd_debug_exit); |
8b0510b5 | 2908 | #endif /* CONFIG_DEBUG_FS */ |