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: | |
314 | if (genpd_status_on(genpd)) { | |
315 | ret = genpd->set_performance_state(genpd, state); | |
316 | if (ret) { | |
317 | gpd_data->performance_state = prev; | |
318 | goto unlock; | |
319 | } | |
320 | } | |
321 | ||
322 | genpd->performance_state = state; | |
323 | ||
324 | unlock: | |
325 | genpd_unlock(genpd); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
330 | ||
86e12eac | 331 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 332 | { |
fc5cbf0c | 333 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
334 | ktime_t time_start; |
335 | s64 elapsed_ns; | |
336 | int ret; | |
337 | ||
338 | if (!genpd->power_on) | |
339 | return 0; | |
340 | ||
a4630c61 GU |
341 | if (!timed) |
342 | return genpd->power_on(genpd); | |
343 | ||
c8f0ea45 GU |
344 | time_start = ktime_get(); |
345 | ret = genpd->power_on(genpd); | |
346 | if (ret) | |
347 | return ret; | |
348 | ||
349 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
42f6284a VK |
350 | |
351 | if (unlikely(genpd->set_performance_state)) { | |
352 | ret = genpd->set_performance_state(genpd, genpd->performance_state); | |
353 | if (ret) { | |
354 | pr_warn("%s: Failed to set performance state %d (%d)\n", | |
355 | genpd->name, genpd->performance_state, ret); | |
356 | } | |
357 | } | |
358 | ||
fc5cbf0c | 359 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
360 | return ret; |
361 | ||
fc5cbf0c | 362 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 363 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
364 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
365 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
366 | |
367 | return ret; | |
368 | } | |
369 | ||
86e12eac | 370 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 371 | { |
fc5cbf0c | 372 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
373 | ktime_t time_start; |
374 | s64 elapsed_ns; | |
375 | int ret; | |
376 | ||
377 | if (!genpd->power_off) | |
378 | return 0; | |
379 | ||
a4630c61 GU |
380 | if (!timed) |
381 | return genpd->power_off(genpd); | |
382 | ||
c8f0ea45 GU |
383 | time_start = ktime_get(); |
384 | ret = genpd->power_off(genpd); | |
385 | if (ret == -EBUSY) | |
386 | return ret; | |
387 | ||
388 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 389 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
c8f0ea45 GU |
390 | return ret; |
391 | ||
fc5cbf0c | 392 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 393 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
394 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
395 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
396 | |
397 | return ret; | |
398 | } | |
399 | ||
29e47e21 | 400 | /** |
86e12eac | 401 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 402 | * @genpd: PM domain to power off. |
29e47e21 | 403 | * |
86e12eac | 404 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
405 | * before. |
406 | */ | |
407 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
408 | { | |
409 | queue_work(pm_wq, &genpd->power_off_work); | |
410 | } | |
411 | ||
1f8728b7 UH |
412 | /** |
413 | * genpd_power_off - Remove power from a given PM domain. | |
414 | * @genpd: PM domain to power down. | |
3c64649d UH |
415 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
416 | * RPM status of the releated device is in an intermediate state, not yet turned | |
417 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
418 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
419 | * |
420 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
421 | * have been powered down, remove power from @genpd. | |
422 | */ | |
2da83545 UH |
423 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
424 | unsigned int depth) | |
1f8728b7 UH |
425 | { |
426 | struct pm_domain_data *pdd; | |
427 | struct gpd_link *link; | |
428 | unsigned int not_suspended = 0; | |
429 | ||
430 | /* | |
431 | * Do not try to power off the domain in the following situations: | |
432 | * (1) The domain is already in the "power off" state. | |
433 | * (2) System suspend is in progress. | |
434 | */ | |
41e2c8e0 | 435 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
436 | return 0; |
437 | ||
ffaa42e8 UH |
438 | /* |
439 | * Abort power off for the PM domain in the following situations: | |
440 | * (1) The domain is configured as always on. | |
441 | * (2) When the domain has a subdomain being powered on. | |
442 | */ | |
443 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
444 | return -EBUSY; |
445 | ||
446 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
447 | enum pm_qos_flags_status stat; | |
448 | ||
20f97caf | 449 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
450 | if (stat > PM_QOS_FLAGS_NONE) |
451 | return -EBUSY; | |
452 | ||
453 | /* | |
454 | * Do not allow PM domain to be powered off, when an IRQ safe | |
455 | * device is part of a non-IRQ safe domain. | |
456 | */ | |
457 | if (!pm_runtime_suspended(pdd->dev) || | |
458 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
459 | not_suspended++; | |
460 | } | |
461 | ||
3c64649d | 462 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
463 | return -EBUSY; |
464 | ||
465 | if (genpd->gov && genpd->gov->power_down_ok) { | |
466 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
467 | return -EAGAIN; | |
468 | } | |
469 | ||
2c9b7f87 UH |
470 | /* Default to shallowest state. */ |
471 | if (!genpd->gov) | |
472 | genpd->state_idx = 0; | |
473 | ||
1f8728b7 UH |
474 | if (genpd->power_off) { |
475 | int ret; | |
476 | ||
477 | if (atomic_read(&genpd->sd_count) > 0) | |
478 | return -EBUSY; | |
479 | ||
480 | /* | |
481 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
482 | * managed to call genpd_power_on() for the master yet after | |
483 | * incrementing it. In that case genpd_power_on() will wait | |
484 | * for us to drop the lock, so we can call .power_off() and let | |
485 | * the genpd_power_on() restore power for us (this shouldn't | |
486 | * happen very often). | |
487 | */ | |
488 | ret = _genpd_power_off(genpd, true); | |
489 | if (ret) | |
490 | return ret; | |
491 | } | |
492 | ||
493 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 494 | genpd_update_accounting(genpd); |
1f8728b7 UH |
495 | |
496 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
497 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
498 | genpd_lock_nested(link->master, depth + 1); |
499 | genpd_power_off(link->master, false, depth + 1); | |
500 | genpd_unlock(link->master); | |
1f8728b7 UH |
501 | } |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
5248051b | 506 | /** |
86e12eac | 507 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 508 | * @genpd: PM domain to power up. |
0106ef51 | 509 | * @depth: nesting count for lockdep. |
5248051b | 510 | * |
5063ce15 | 511 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
512 | * resume a device belonging to it. |
513 | */ | |
86e12eac | 514 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 515 | { |
5063ce15 | 516 | struct gpd_link *link; |
5248051b RW |
517 | int ret = 0; |
518 | ||
41e2c8e0 | 519 | if (genpd_status_on(genpd)) |
3f241775 | 520 | return 0; |
5248051b | 521 | |
5063ce15 RW |
522 | /* |
523 | * The list is guaranteed not to change while the loop below is being | |
524 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
525 | * with it. | |
526 | */ | |
527 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
528 | struct generic_pm_domain *master = link->master; |
529 | ||
530 | genpd_sd_counter_inc(master); | |
531 | ||
35241d12 | 532 | genpd_lock_nested(master, depth + 1); |
86e12eac | 533 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 534 | genpd_unlock(master); |
5248051b | 535 | |
5063ce15 | 536 | if (ret) { |
0106ef51 | 537 | genpd_sd_counter_dec(master); |
9e08cf42 | 538 | goto err; |
5063ce15 | 539 | } |
5248051b RW |
540 | } |
541 | ||
86e12eac | 542 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
543 | if (ret) |
544 | goto err; | |
5248051b | 545 | |
ba2bbfbf | 546 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
547 | genpd_update_accounting(genpd); |
548 | ||
3f241775 | 549 | return 0; |
9e08cf42 RW |
550 | |
551 | err: | |
29e47e21 UH |
552 | list_for_each_entry_continue_reverse(link, |
553 | &genpd->slave_links, | |
554 | slave_node) { | |
5063ce15 | 555 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
556 | genpd_lock_nested(link->master, depth + 1); |
557 | genpd_power_off(link->master, false, depth + 1); | |
558 | genpd_unlock(link->master); | |
29e47e21 | 559 | } |
9e08cf42 | 560 | |
3f241775 RW |
561 | return ret; |
562 | } | |
563 | ||
6ff7bb0d RW |
564 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
565 | unsigned long val, void *ptr) | |
566 | { | |
567 | struct generic_pm_domain_data *gpd_data; | |
568 | struct device *dev; | |
569 | ||
570 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 571 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
572 | |
573 | for (;;) { | |
574 | struct generic_pm_domain *genpd; | |
575 | struct pm_domain_data *pdd; | |
576 | ||
577 | spin_lock_irq(&dev->power.lock); | |
578 | ||
579 | pdd = dev->power.subsys_data ? | |
580 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 581 | if (pdd) { |
6ff7bb0d RW |
582 | to_gpd_data(pdd)->td.constraint_changed = true; |
583 | genpd = dev_to_genpd(dev); | |
584 | } else { | |
585 | genpd = ERR_PTR(-ENODATA); | |
586 | } | |
587 | ||
588 | spin_unlock_irq(&dev->power.lock); | |
589 | ||
590 | if (!IS_ERR(genpd)) { | |
35241d12 | 591 | genpd_lock(genpd); |
6ff7bb0d | 592 | genpd->max_off_time_changed = true; |
35241d12 | 593 | genpd_unlock(genpd); |
6ff7bb0d RW |
594 | } |
595 | ||
596 | dev = dev->parent; | |
597 | if (!dev || dev->power.ignore_children) | |
598 | break; | |
599 | } | |
600 | ||
601 | return NOTIFY_DONE; | |
602 | } | |
603 | ||
f721889f RW |
604 | /** |
605 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
606 | * @work: Work structure used for scheduling the execution of this function. | |
607 | */ | |
608 | static void genpd_power_off_work_fn(struct work_struct *work) | |
609 | { | |
610 | struct generic_pm_domain *genpd; | |
611 | ||
612 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
613 | ||
35241d12 | 614 | genpd_lock(genpd); |
2da83545 | 615 | genpd_power_off(genpd, false, 0); |
35241d12 | 616 | genpd_unlock(genpd); |
f721889f RW |
617 | } |
618 | ||
54eeddbf UH |
619 | /** |
620 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
621 | * @dev: Device to handle. | |
622 | */ | |
623 | static int __genpd_runtime_suspend(struct device *dev) | |
624 | { | |
625 | int (*cb)(struct device *__dev); | |
626 | ||
627 | if (dev->type && dev->type->pm) | |
628 | cb = dev->type->pm->runtime_suspend; | |
629 | else if (dev->class && dev->class->pm) | |
630 | cb = dev->class->pm->runtime_suspend; | |
631 | else if (dev->bus && dev->bus->pm) | |
632 | cb = dev->bus->pm->runtime_suspend; | |
633 | else | |
634 | cb = NULL; | |
635 | ||
636 | if (!cb && dev->driver && dev->driver->pm) | |
637 | cb = dev->driver->pm->runtime_suspend; | |
638 | ||
639 | return cb ? cb(dev) : 0; | |
640 | } | |
641 | ||
642 | /** | |
643 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
644 | * @dev: Device to handle. | |
645 | */ | |
646 | static int __genpd_runtime_resume(struct device *dev) | |
647 | { | |
648 | int (*cb)(struct device *__dev); | |
649 | ||
650 | if (dev->type && dev->type->pm) | |
651 | cb = dev->type->pm->runtime_resume; | |
652 | else if (dev->class && dev->class->pm) | |
653 | cb = dev->class->pm->runtime_resume; | |
654 | else if (dev->bus && dev->bus->pm) | |
655 | cb = dev->bus->pm->runtime_resume; | |
656 | else | |
657 | cb = NULL; | |
658 | ||
659 | if (!cb && dev->driver && dev->driver->pm) | |
660 | cb = dev->driver->pm->runtime_resume; | |
661 | ||
662 | return cb ? cb(dev) : 0; | |
663 | } | |
664 | ||
f721889f | 665 | /** |
795bd2e7 | 666 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
667 | * @dev: Device to suspend. |
668 | * | |
669 | * Carry out a runtime suspend of a device under the assumption that its | |
670 | * pm_domain field points to the domain member of an object of type | |
671 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
672 | */ | |
795bd2e7 | 673 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
674 | { |
675 | struct generic_pm_domain *genpd; | |
9df3921e | 676 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 677 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 678 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
679 | ktime_t time_start; |
680 | s64 elapsed_ns; | |
d5e4cbfe | 681 | int ret; |
f721889f RW |
682 | |
683 | dev_dbg(dev, "%s()\n", __func__); | |
684 | ||
5248051b RW |
685 | genpd = dev_to_genpd(dev); |
686 | if (IS_ERR(genpd)) | |
f721889f RW |
687 | return -EINVAL; |
688 | ||
ffe12855 UH |
689 | /* |
690 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
691 | * callbacks for other purposes than runtime PM. In those scenarios | |
692 | * runtime PM is disabled. Under these circumstances, we shall skip | |
693 | * validating/measuring the PM QoS latency. | |
694 | */ | |
9df3921e UH |
695 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
696 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
697 | return -EBUSY; |
698 | ||
2b1d88cd | 699 | /* Measure suspend latency. */ |
d33d5a6c | 700 | time_start = 0; |
ffe12855 UH |
701 | if (runtime_pm) |
702 | time_start = ktime_get(); | |
2b1d88cd | 703 | |
54eeddbf | 704 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
705 | if (ret) |
706 | return ret; | |
17b75eca | 707 | |
2b1d88cd | 708 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 709 | if (ret) { |
54eeddbf | 710 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
711 | return ret; |
712 | } | |
713 | ||
2b1d88cd | 714 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
715 | if (runtime_pm) { |
716 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
717 | if (elapsed_ns > td->suspend_latency_ns) { | |
718 | td->suspend_latency_ns = elapsed_ns; | |
719 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
720 | elapsed_ns); | |
721 | genpd->max_off_time_changed = true; | |
722 | td->constraint_changed = true; | |
723 | } | |
2b1d88cd UH |
724 | } |
725 | ||
0aa2a221 | 726 | /* |
d716f479 LI |
727 | * If power.irq_safe is set, this routine may be run with |
728 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 729 | */ |
d716f479 | 730 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
731 | return 0; |
732 | ||
35241d12 | 733 | genpd_lock(genpd); |
2da83545 | 734 | genpd_power_off(genpd, true, 0); |
35241d12 | 735 | genpd_unlock(genpd); |
f721889f RW |
736 | |
737 | return 0; | |
738 | } | |
739 | ||
f721889f | 740 | /** |
795bd2e7 | 741 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
742 | * @dev: Device to resume. |
743 | * | |
744 | * Carry out a runtime resume of a device under the assumption that its | |
745 | * pm_domain field points to the domain member of an object of type | |
746 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
747 | */ | |
795bd2e7 | 748 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
749 | { |
750 | struct generic_pm_domain *genpd; | |
2b1d88cd | 751 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 752 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
753 | ktime_t time_start; |
754 | s64 elapsed_ns; | |
f721889f | 755 | int ret; |
ba2bbfbf | 756 | bool timed = true; |
f721889f RW |
757 | |
758 | dev_dbg(dev, "%s()\n", __func__); | |
759 | ||
5248051b RW |
760 | genpd = dev_to_genpd(dev); |
761 | if (IS_ERR(genpd)) | |
f721889f RW |
762 | return -EINVAL; |
763 | ||
d716f479 LI |
764 | /* |
765 | * As we don't power off a non IRQ safe domain, which holds | |
766 | * an IRQ safe device, we don't need to restore power to it. | |
767 | */ | |
768 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
769 | timed = false; |
770 | goto out; | |
771 | } | |
0aa2a221 | 772 | |
35241d12 | 773 | genpd_lock(genpd); |
86e12eac | 774 | ret = genpd_power_on(genpd, 0); |
35241d12 | 775 | genpd_unlock(genpd); |
c6d22b37 | 776 | |
ba2bbfbf UH |
777 | if (ret) |
778 | return ret; | |
c6d22b37 | 779 | |
ba2bbfbf | 780 | out: |
2b1d88cd | 781 | /* Measure resume latency. */ |
ab51e6ba | 782 | time_start = 0; |
ffe12855 | 783 | if (timed && runtime_pm) |
2b1d88cd UH |
784 | time_start = ktime_get(); |
785 | ||
076395ca LP |
786 | ret = genpd_start_dev(genpd, dev); |
787 | if (ret) | |
788 | goto err_poweroff; | |
789 | ||
54eeddbf | 790 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
791 | if (ret) |
792 | goto err_stop; | |
2b1d88cd UH |
793 | |
794 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 795 | if (timed && runtime_pm) { |
2b1d88cd UH |
796 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
797 | if (elapsed_ns > td->resume_latency_ns) { | |
798 | td->resume_latency_ns = elapsed_ns; | |
799 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
800 | elapsed_ns); | |
801 | genpd->max_off_time_changed = true; | |
802 | td->constraint_changed = true; | |
803 | } | |
804 | } | |
17b75eca | 805 | |
f721889f | 806 | return 0; |
076395ca LP |
807 | |
808 | err_stop: | |
809 | genpd_stop_dev(genpd, dev); | |
810 | err_poweroff: | |
d716f479 LI |
811 | if (!pm_runtime_is_irq_safe(dev) || |
812 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 813 | genpd_lock(genpd); |
2da83545 | 814 | genpd_power_off(genpd, true, 0); |
35241d12 | 815 | genpd_unlock(genpd); |
076395ca LP |
816 | } |
817 | ||
818 | return ret; | |
f721889f RW |
819 | } |
820 | ||
39ac5ba5 TB |
821 | static bool pd_ignore_unused; |
822 | static int __init pd_ignore_unused_setup(char *__unused) | |
823 | { | |
824 | pd_ignore_unused = true; | |
825 | return 1; | |
826 | } | |
827 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
828 | ||
17f2ae7f | 829 | /** |
86e12eac | 830 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 831 | */ |
86e12eac | 832 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
833 | { |
834 | struct generic_pm_domain *genpd; | |
835 | ||
39ac5ba5 TB |
836 | if (pd_ignore_unused) { |
837 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 838 | return 0; |
39ac5ba5 TB |
839 | } |
840 | ||
17f2ae7f RW |
841 | mutex_lock(&gpd_list_lock); |
842 | ||
843 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
844 | genpd_queue_power_off_work(genpd); | |
845 | ||
846 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 847 | |
2fe71dcd UH |
848 | return 0; |
849 | } | |
86e12eac | 850 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 851 | |
0159ec67 | 852 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 853 | |
9e9704ea | 854 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 855 | { |
895b31f3 | 856 | const struct generic_pm_domain *gpd; |
77f827de RW |
857 | |
858 | if (IS_ERR_OR_NULL(genpd)) | |
859 | return false; | |
860 | ||
861 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
862 | if (gpd == genpd) | |
863 | return true; | |
864 | ||
865 | return false; | |
866 | } | |
867 | ||
0159ec67 JH |
868 | #endif |
869 | ||
870 | #ifdef CONFIG_PM_SLEEP | |
871 | ||
596ba34b | 872 | /** |
86e12eac | 873 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 874 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
875 | * @use_lock: use the lock. |
876 | * @depth: nesting count for lockdep. | |
596ba34b RW |
877 | * |
878 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 879 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 880 | * |
77f827de | 881 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
882 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
883 | * these cases the lock must be held. | |
596ba34b | 884 | */ |
0883ac03 UH |
885 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
886 | unsigned int depth) | |
596ba34b | 887 | { |
5063ce15 | 888 | struct gpd_link *link; |
596ba34b | 889 | |
ffaa42e8 | 890 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
891 | return; |
892 | ||
c4bb3160 RW |
893 | if (genpd->suspended_count != genpd->device_count |
894 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
895 | return; |
896 | ||
fc5cbf0c AH |
897 | /* Choose the deepest state when suspending */ |
898 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
899 | if (_genpd_power_off(genpd, false)) |
900 | return; | |
596ba34b | 901 | |
17b75eca | 902 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
903 | |
904 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
905 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
906 | |
907 | if (use_lock) | |
908 | genpd_lock_nested(link->master, depth + 1); | |
909 | ||
910 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
911 | ||
912 | if (use_lock) | |
913 | genpd_unlock(link->master); | |
596ba34b RW |
914 | } |
915 | } | |
916 | ||
802d8b49 | 917 | /** |
86e12eac | 918 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 919 | * @genpd: PM domain to power on. |
0883ac03 UH |
920 | * @use_lock: use the lock. |
921 | * @depth: nesting count for lockdep. | |
802d8b49 | 922 | * |
77f827de | 923 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
924 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
925 | * these cases the lock must be held. | |
802d8b49 | 926 | */ |
0883ac03 UH |
927 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
928 | unsigned int depth) | |
802d8b49 RW |
929 | { |
930 | struct gpd_link *link; | |
931 | ||
41e2c8e0 | 932 | if (genpd_status_on(genpd)) |
802d8b49 RW |
933 | return; |
934 | ||
935 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 936 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
937 | |
938 | if (use_lock) | |
939 | genpd_lock_nested(link->master, depth + 1); | |
940 | ||
941 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
942 | ||
943 | if (use_lock) | |
944 | genpd_unlock(link->master); | |
802d8b49 RW |
945 | } |
946 | ||
86e12eac | 947 | _genpd_power_on(genpd, false); |
802d8b49 RW |
948 | |
949 | genpd->status = GPD_STATE_ACTIVE; | |
950 | } | |
951 | ||
4ecd6e65 RW |
952 | /** |
953 | * resume_needed - Check whether to resume a device before system suspend. | |
954 | * @dev: Device to check. | |
955 | * @genpd: PM domain the device belongs to. | |
956 | * | |
957 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 958 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
959 | * to wake up the system and it has to remain active for this purpose while the |
960 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
961 | * the system from sleep states and it generally doesn't generate wakeup signals | |
962 | * by itself (those signals are generated on its behalf by other parts of the | |
963 | * system). In the latter case it may be necessary to reconfigure the device's | |
964 | * wakeup settings during system suspend, because it may have been set up to | |
965 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
966 | * Return 'true' in either of the above cases. | |
967 | */ | |
d8600c8b KK |
968 | static bool resume_needed(struct device *dev, |
969 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
970 | { |
971 | bool active_wakeup; | |
972 | ||
973 | if (!device_can_wakeup(dev)) | |
974 | return false; | |
975 | ||
d0af45f1 | 976 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
977 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
978 | } | |
979 | ||
596ba34b | 980 | /** |
9e9704ea | 981 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
982 | * @dev: Device to start the transition of. |
983 | * | |
984 | * Start a power transition of a device (during a system-wide power transition) | |
985 | * under the assumption that its pm_domain field points to the domain member of | |
986 | * an object of type struct generic_pm_domain representing a PM domain | |
987 | * consisting of I/O devices. | |
988 | */ | |
9e9704ea | 989 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
990 | { |
991 | struct generic_pm_domain *genpd; | |
b6c10c84 | 992 | int ret; |
596ba34b RW |
993 | |
994 | dev_dbg(dev, "%s()\n", __func__); | |
995 | ||
996 | genpd = dev_to_genpd(dev); | |
997 | if (IS_ERR(genpd)) | |
998 | return -EINVAL; | |
999 | ||
17b75eca RW |
1000 | /* |
1001 | * If a wakeup request is pending for the device, it should be woken up | |
1002 | * at this point and a system wakeup event should be reported if it's | |
1003 | * set up to wake up the system from sleep states. | |
1004 | */ | |
4ecd6e65 RW |
1005 | if (resume_needed(dev, genpd)) |
1006 | pm_runtime_resume(dev); | |
1007 | ||
35241d12 | 1008 | genpd_lock(genpd); |
596ba34b | 1009 | |
39dd0f23 | 1010 | if (genpd->prepared_count++ == 0) |
65533bbf | 1011 | genpd->suspended_count = 0; |
17b75eca | 1012 | |
35241d12 | 1013 | genpd_unlock(genpd); |
596ba34b | 1014 | |
b6c10c84 | 1015 | ret = pm_generic_prepare(dev); |
5241ab40 | 1016 | if (ret < 0) { |
35241d12 | 1017 | genpd_lock(genpd); |
b6c10c84 | 1018 | |
39dd0f23 | 1019 | genpd->prepared_count--; |
b6c10c84 | 1020 | |
35241d12 | 1021 | genpd_unlock(genpd); |
b6c10c84 | 1022 | } |
17b75eca | 1023 | |
5241ab40 UH |
1024 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1025 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1026 | } |
1027 | ||
0496c8ae | 1028 | /** |
10da6542 MP |
1029 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1030 | * I/O pm domain. | |
0496c8ae | 1031 | * @dev: Device to suspend. |
10da6542 | 1032 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1033 | * |
1034 | * Stop the device and remove power from the domain if all devices in it have | |
1035 | * been stopped. | |
1036 | */ | |
10da6542 | 1037 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1038 | { |
1039 | struct generic_pm_domain *genpd; | |
a935424b | 1040 | int ret = 0; |
0496c8ae | 1041 | |
0496c8ae RW |
1042 | genpd = dev_to_genpd(dev); |
1043 | if (IS_ERR(genpd)) | |
1044 | return -EINVAL; | |
596ba34b | 1045 | |
10da6542 MP |
1046 | if (poweroff) |
1047 | ret = pm_generic_poweroff_noirq(dev); | |
1048 | else | |
1049 | ret = pm_generic_suspend_noirq(dev); | |
1050 | if (ret) | |
1051 | return ret; | |
1052 | ||
a935424b UH |
1053 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1054 | return 0; | |
1055 | ||
17218e00 RW |
1056 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1057 | !pm_runtime_status_suspended(dev)) { | |
1058 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1059 | if (ret) { |
1060 | if (poweroff) | |
1061 | pm_generic_restore_noirq(dev); | |
1062 | else | |
1063 | pm_generic_resume_noirq(dev); | |
122a2237 | 1064 | return ret; |
a935424b | 1065 | } |
122a2237 UH |
1066 | } |
1067 | ||
0883ac03 | 1068 | genpd_lock(genpd); |
596ba34b | 1069 | genpd->suspended_count++; |
0883ac03 UH |
1070 | genpd_sync_power_off(genpd, true, 0); |
1071 | genpd_unlock(genpd); | |
596ba34b RW |
1072 | |
1073 | return 0; | |
1074 | } | |
1075 | ||
10da6542 | 1076 | /** |
9e9704ea | 1077 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1078 | * @dev: Device to suspend. |
1079 | * | |
1080 | * Stop the device and remove power from the domain if all devices in it have | |
1081 | * been stopped. | |
1082 | */ | |
9e9704ea | 1083 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1084 | { |
1085 | dev_dbg(dev, "%s()\n", __func__); | |
1086 | ||
1087 | return genpd_finish_suspend(dev, false); | |
1088 | } | |
1089 | ||
596ba34b | 1090 | /** |
9e9704ea | 1091 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1092 | * @dev: Device to resume. |
1093 | * | |
0496c8ae | 1094 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1095 | */ |
9e9704ea | 1096 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1097 | { |
1098 | struct generic_pm_domain *genpd; | |
a935424b | 1099 | int ret; |
596ba34b RW |
1100 | |
1101 | dev_dbg(dev, "%s()\n", __func__); | |
1102 | ||
1103 | genpd = dev_to_genpd(dev); | |
1104 | if (IS_ERR(genpd)) | |
1105 | return -EINVAL; | |
1106 | ||
d0af45f1 | 1107 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1108 | return pm_generic_resume_noirq(dev); |
596ba34b | 1109 | |
0883ac03 UH |
1110 | genpd_lock(genpd); |
1111 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1112 | genpd->suspended_count--; |
0883ac03 | 1113 | genpd_unlock(genpd); |
596ba34b | 1114 | |
17218e00 RW |
1115 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1116 | !pm_runtime_status_suspended(dev)) { | |
1117 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1118 | if (ret) |
1119 | return ret; | |
1120 | } | |
122a2237 | 1121 | |
a935424b | 1122 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1123 | } |
1124 | ||
0496c8ae | 1125 | /** |
9e9704ea | 1126 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1127 | * @dev: Device to freeze. |
1128 | * | |
1129 | * Carry out a late freeze of a device under the assumption that its | |
1130 | * pm_domain field points to the domain member of an object of type | |
1131 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1132 | * devices. | |
1133 | */ | |
9e9704ea | 1134 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1135 | { |
d8600c8b | 1136 | const struct generic_pm_domain *genpd; |
122a2237 | 1137 | int ret = 0; |
596ba34b RW |
1138 | |
1139 | dev_dbg(dev, "%s()\n", __func__); | |
1140 | ||
1141 | genpd = dev_to_genpd(dev); | |
1142 | if (IS_ERR(genpd)) | |
1143 | return -EINVAL; | |
1144 | ||
10da6542 MP |
1145 | ret = pm_generic_freeze_noirq(dev); |
1146 | if (ret) | |
1147 | return ret; | |
1148 | ||
17218e00 RW |
1149 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1150 | !pm_runtime_status_suspended(dev)) | |
1151 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1152 | |
1153 | return ret; | |
0496c8ae | 1154 | } |
596ba34b | 1155 | |
0496c8ae | 1156 | /** |
9e9704ea | 1157 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1158 | * @dev: Device to thaw. |
1159 | * | |
1160 | * Start the device, unless power has been removed from the domain already | |
1161 | * before the system transition. | |
1162 | */ | |
9e9704ea | 1163 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1164 | { |
d8600c8b | 1165 | const struct generic_pm_domain *genpd; |
122a2237 | 1166 | int ret = 0; |
596ba34b | 1167 | |
0496c8ae | 1168 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1169 | |
0496c8ae RW |
1170 | genpd = dev_to_genpd(dev); |
1171 | if (IS_ERR(genpd)) | |
1172 | return -EINVAL; | |
1173 | ||
17218e00 RW |
1174 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1175 | !pm_runtime_status_suspended(dev)) { | |
1176 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1177 | if (ret) |
1178 | return ret; | |
1179 | } | |
122a2237 | 1180 | |
10da6542 MP |
1181 | return pm_generic_thaw_noirq(dev); |
1182 | } | |
1183 | ||
1184 | /** | |
9e9704ea | 1185 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1186 | * I/O PM domain. |
1187 | * @dev: Device to poweroff. | |
1188 | * | |
1189 | * Stop the device and remove power from the domain if all devices in it have | |
1190 | * been stopped. | |
1191 | */ | |
9e9704ea | 1192 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1193 | { |
1194 | dev_dbg(dev, "%s()\n", __func__); | |
1195 | ||
1196 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1197 | } |
1198 | ||
596ba34b | 1199 | /** |
9e9704ea | 1200 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1201 | * @dev: Device to resume. |
1202 | * | |
0496c8ae RW |
1203 | * Make sure the domain will be in the same power state as before the |
1204 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1205 | */ |
9e9704ea | 1206 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1207 | { |
1208 | struct generic_pm_domain *genpd; | |
122a2237 | 1209 | int ret = 0; |
596ba34b RW |
1210 | |
1211 | dev_dbg(dev, "%s()\n", __func__); | |
1212 | ||
1213 | genpd = dev_to_genpd(dev); | |
1214 | if (IS_ERR(genpd)) | |
1215 | return -EINVAL; | |
1216 | ||
1217 | /* | |
65533bbf RW |
1218 | * At this point suspended_count == 0 means we are being run for the |
1219 | * first time for the given domain in the present cycle. | |
596ba34b | 1220 | */ |
0883ac03 | 1221 | genpd_lock(genpd); |
39dd0f23 | 1222 | if (genpd->suspended_count++ == 0) |
596ba34b | 1223 | /* |
65533bbf | 1224 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1225 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1226 | * so that it tries to power it on in case it was really off. |
596ba34b | 1227 | */ |
65533bbf | 1228 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1229 | |
0883ac03 UH |
1230 | genpd_sync_power_on(genpd, true, 0); |
1231 | genpd_unlock(genpd); | |
596ba34b | 1232 | |
17218e00 RW |
1233 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1234 | !pm_runtime_status_suspended(dev)) { | |
1235 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1236 | if (ret) |
1237 | return ret; | |
1238 | } | |
122a2237 | 1239 | |
10da6542 | 1240 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1241 | } |
1242 | ||
1243 | /** | |
9e9704ea | 1244 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1245 | * @dev: Device to complete the transition of. |
1246 | * | |
1247 | * Complete a power transition of a device (during a system-wide power | |
1248 | * transition) under the assumption that its pm_domain field points to the | |
1249 | * domain member of an object of type struct generic_pm_domain representing | |
1250 | * a power domain consisting of I/O devices. | |
1251 | */ | |
9e9704ea | 1252 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1253 | { |
1254 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1255 | |
1256 | dev_dbg(dev, "%s()\n", __func__); | |
1257 | ||
1258 | genpd = dev_to_genpd(dev); | |
1259 | if (IS_ERR(genpd)) | |
1260 | return; | |
1261 | ||
4d23a5e8 UH |
1262 | pm_generic_complete(dev); |
1263 | ||
35241d12 | 1264 | genpd_lock(genpd); |
596ba34b | 1265 | |
39dd0f23 | 1266 | genpd->prepared_count--; |
4d23a5e8 UH |
1267 | if (!genpd->prepared_count) |
1268 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1269 | |
35241d12 | 1270 | genpd_unlock(genpd); |
596ba34b RW |
1271 | } |
1272 | ||
77f827de | 1273 | /** |
d47e6464 | 1274 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1275 | * @dev: Device that normally is marked as "always on" to switch power for. |
1276 | * | |
1277 | * This routine may only be called during the system core (syscore) suspend or | |
1278 | * resume phase for devices whose "always on" flags are set. | |
1279 | */ | |
d47e6464 | 1280 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1281 | { |
1282 | struct generic_pm_domain *genpd; | |
1283 | ||
23c6d2c7 | 1284 | genpd = dev_to_genpd(dev); |
9e9704ea | 1285 | if (!genpd_present(genpd)) |
77f827de RW |
1286 | return; |
1287 | ||
1288 | if (suspend) { | |
1289 | genpd->suspended_count++; | |
0883ac03 | 1290 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1291 | } else { |
0883ac03 | 1292 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1293 | genpd->suspended_count--; |
1294 | } | |
1295 | } | |
d47e6464 UH |
1296 | |
1297 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1298 | { | |
1299 | genpd_syscore_switch(dev, true); | |
1300 | } | |
1301 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1302 | ||
1303 | void pm_genpd_syscore_poweron(struct device *dev) | |
1304 | { | |
1305 | genpd_syscore_switch(dev, false); | |
1306 | } | |
1307 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1308 | |
d30d819d | 1309 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1310 | |
9e9704ea UH |
1311 | #define genpd_prepare NULL |
1312 | #define genpd_suspend_noirq NULL | |
1313 | #define genpd_resume_noirq NULL | |
1314 | #define genpd_freeze_noirq NULL | |
1315 | #define genpd_thaw_noirq NULL | |
1316 | #define genpd_poweroff_noirq NULL | |
1317 | #define genpd_restore_noirq NULL | |
1318 | #define genpd_complete NULL | |
596ba34b RW |
1319 | |
1320 | #endif /* CONFIG_PM_SLEEP */ | |
1321 | ||
f104e1e5 | 1322 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
f104e1e5 | 1323 | struct gpd_timing_data *td) |
1d5fcfec RW |
1324 | { |
1325 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1326 | int ret; |
1327 | ||
1328 | ret = dev_pm_get_subsys_data(dev); | |
1329 | if (ret) | |
1330 | return ERR_PTR(ret); | |
1d5fcfec RW |
1331 | |
1332 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1333 | if (!gpd_data) { |
1334 | ret = -ENOMEM; | |
1335 | goto err_put; | |
1336 | } | |
1d5fcfec | 1337 | |
f104e1e5 UH |
1338 | if (td) |
1339 | gpd_data->td = *td; | |
1340 | ||
1341 | gpd_data->base.dev = dev; | |
f104e1e5 | 1342 | gpd_data->td.constraint_changed = true; |
0759e80b | 1343 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1344 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1345 | ||
1346 | spin_lock_irq(&dev->power.lock); | |
1347 | ||
1348 | if (dev->power.subsys_data->domain_data) { | |
1349 | ret = -EINVAL; | |
1350 | goto err_free; | |
1351 | } | |
1352 | ||
1353 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1354 | |
1355 | spin_unlock_irq(&dev->power.lock); | |
1356 | ||
1d5fcfec | 1357 | return gpd_data; |
3e235685 | 1358 | |
f104e1e5 UH |
1359 | err_free: |
1360 | spin_unlock_irq(&dev->power.lock); | |
1361 | kfree(gpd_data); | |
3e235685 UH |
1362 | err_put: |
1363 | dev_pm_put_subsys_data(dev); | |
1364 | return ERR_PTR(ret); | |
1d5fcfec RW |
1365 | } |
1366 | ||
49d400c7 UH |
1367 | static void genpd_free_dev_data(struct device *dev, |
1368 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1369 | { |
f104e1e5 UH |
1370 | spin_lock_irq(&dev->power.lock); |
1371 | ||
f104e1e5 UH |
1372 | dev->power.subsys_data->domain_data = NULL; |
1373 | ||
1374 | spin_unlock_irq(&dev->power.lock); | |
1375 | ||
1d5fcfec | 1376 | kfree(gpd_data); |
3e235685 | 1377 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1378 | } |
1379 | ||
19efa5ff JH |
1380 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1381 | struct gpd_timing_data *td) | |
f721889f | 1382 | { |
c0356db7 | 1383 | struct generic_pm_domain_data *gpd_data; |
b56d9c91 | 1384 | int ret; |
f721889f RW |
1385 | |
1386 | dev_dbg(dev, "%s()\n", __func__); | |
1387 | ||
1388 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1389 | return -EINVAL; | |
1390 | ||
96c1bf68 | 1391 | gpd_data = genpd_alloc_dev_data(dev, td); |
3e235685 UH |
1392 | if (IS_ERR(gpd_data)) |
1393 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1394 | |
35241d12 | 1395 | genpd_lock(genpd); |
f721889f | 1396 | |
b472c2fa UH |
1397 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1398 | if (ret) | |
1399 | goto out; | |
d79b6fe1 | 1400 | |
975e83cf SH |
1401 | dev_pm_domain_set(dev, &genpd->domain); |
1402 | ||
14b53064 UH |
1403 | genpd->device_count++; |
1404 | genpd->max_off_time_changed = true; | |
1405 | ||
1d5fcfec | 1406 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1407 | |
f721889f | 1408 | out: |
35241d12 | 1409 | genpd_unlock(genpd); |
f721889f | 1410 | |
c0356db7 UH |
1411 | if (ret) |
1412 | genpd_free_dev_data(dev, gpd_data); | |
1413 | else | |
1414 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1415 | |
f721889f RW |
1416 | return ret; |
1417 | } | |
19efa5ff JH |
1418 | |
1419 | /** | |
1a7a6707 | 1420 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1421 | * @genpd: PM domain to add the device to. |
1422 | * @dev: Device to be added. | |
19efa5ff | 1423 | */ |
1a7a6707 | 1424 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1425 | { |
1426 | int ret; | |
1427 | ||
1428 | mutex_lock(&gpd_list_lock); | |
1a7a6707 | 1429 | ret = genpd_add_device(genpd, dev, NULL); |
19efa5ff JH |
1430 | mutex_unlock(&gpd_list_lock); |
1431 | ||
1432 | return ret; | |
1433 | } | |
1a7a6707 | 1434 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1435 | |
85168d56 UH |
1436 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1437 | struct device *dev) | |
f721889f | 1438 | { |
6ff7bb0d | 1439 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1440 | struct pm_domain_data *pdd; |
efa69025 | 1441 | int ret = 0; |
f721889f RW |
1442 | |
1443 | dev_dbg(dev, "%s()\n", __func__); | |
1444 | ||
c0356db7 UH |
1445 | pdd = dev->power.subsys_data->domain_data; |
1446 | gpd_data = to_gpd_data(pdd); | |
1447 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1448 | ||
35241d12 | 1449 | genpd_lock(genpd); |
f721889f | 1450 | |
596ba34b RW |
1451 | if (genpd->prepared_count > 0) { |
1452 | ret = -EAGAIN; | |
1453 | goto out; | |
1454 | } | |
1455 | ||
6ff7bb0d RW |
1456 | genpd->device_count--; |
1457 | genpd->max_off_time_changed = true; | |
1458 | ||
d79b6fe1 | 1459 | if (genpd->detach_dev) |
c16561e8 | 1460 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1461 | |
975e83cf SH |
1462 | dev_pm_domain_set(dev, NULL); |
1463 | ||
efa69025 | 1464 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1465 | |
35241d12 | 1466 | genpd_unlock(genpd); |
6ff7bb0d | 1467 | |
c1dbe2fb | 1468 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1469 | |
6ff7bb0d | 1470 | return 0; |
f721889f | 1471 | |
596ba34b | 1472 | out: |
35241d12 | 1473 | genpd_unlock(genpd); |
c0356db7 | 1474 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1475 | |
1476 | return ret; | |
1477 | } | |
85168d56 UH |
1478 | |
1479 | /** | |
1480 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1481 | * @dev: Device to be removed. |
1482 | */ | |
924f4486 | 1483 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1484 | { |
924f4486 UH |
1485 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1486 | ||
1487 | if (!genpd) | |
85168d56 UH |
1488 | return -EINVAL; |
1489 | ||
1490 | return genpd_remove_device(genpd, dev); | |
1491 | } | |
24c96dc7 | 1492 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1493 | |
19efa5ff JH |
1494 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1495 | struct generic_pm_domain *subdomain) | |
f721889f | 1496 | { |
2547923d | 1497 | struct gpd_link *link, *itr; |
f721889f RW |
1498 | int ret = 0; |
1499 | ||
fb7268be RW |
1500 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1501 | || genpd == subdomain) | |
f721889f RW |
1502 | return -EINVAL; |
1503 | ||
d716f479 LI |
1504 | /* |
1505 | * If the domain can be powered on/off in an IRQ safe | |
1506 | * context, ensure that the subdomain can also be | |
1507 | * powered on/off in that context. | |
1508 | */ | |
1509 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1510 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1511 | genpd->name, subdomain->name); |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
2547923d LI |
1515 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1516 | if (!link) | |
1517 | return -ENOMEM; | |
1518 | ||
35241d12 LI |
1519 | genpd_lock(subdomain); |
1520 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1521 | |
41e2c8e0 | 1522 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1523 | ret = -EINVAL; |
1524 | goto out; | |
1525 | } | |
1526 | ||
2547923d LI |
1527 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1528 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1529 | ret = -EINVAL; |
1530 | goto out; | |
1531 | } | |
1532 | } | |
1533 | ||
5063ce15 RW |
1534 | link->master = genpd; |
1535 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1536 | link->slave = subdomain; |
1537 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1538 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1539 | genpd_sd_counter_inc(genpd); |
f721889f | 1540 | |
f721889f | 1541 | out: |
35241d12 LI |
1542 | genpd_unlock(genpd); |
1543 | genpd_unlock(subdomain); | |
2547923d LI |
1544 | if (ret) |
1545 | kfree(link); | |
f721889f RW |
1546 | return ret; |
1547 | } | |
19efa5ff JH |
1548 | |
1549 | /** | |
1550 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1551 | * @genpd: Master PM domain to add the subdomain to. | |
1552 | * @subdomain: Subdomain to be added. | |
1553 | */ | |
1554 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1555 | struct generic_pm_domain *subdomain) | |
1556 | { | |
1557 | int ret; | |
1558 | ||
1559 | mutex_lock(&gpd_list_lock); | |
1560 | ret = genpd_add_subdomain(genpd, subdomain); | |
1561 | mutex_unlock(&gpd_list_lock); | |
1562 | ||
1563 | return ret; | |
1564 | } | |
d60ee966 | 1565 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1566 | |
1567 | /** | |
1568 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1569 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1570 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1571 | */ |
1572 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1573 | struct generic_pm_domain *subdomain) |
f721889f | 1574 | { |
c6e83cac | 1575 | struct gpd_link *l, *link; |
f721889f RW |
1576 | int ret = -EINVAL; |
1577 | ||
5063ce15 | 1578 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1579 | return -EINVAL; |
1580 | ||
35241d12 LI |
1581 | genpd_lock(subdomain); |
1582 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1583 | |
beda5fc1 | 1584 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
30e7a65b JH |
1585 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, |
1586 | subdomain->name); | |
1587 | ret = -EBUSY; | |
1588 | goto out; | |
1589 | } | |
1590 | ||
c6e83cac | 1591 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1592 | if (link->slave != subdomain) |
f721889f RW |
1593 | continue; |
1594 | ||
5063ce15 RW |
1595 | list_del(&link->master_node); |
1596 | list_del(&link->slave_node); | |
1597 | kfree(link); | |
41e2c8e0 | 1598 | if (genpd_status_on(subdomain)) |
f721889f RW |
1599 | genpd_sd_counter_dec(genpd); |
1600 | ||
f721889f RW |
1601 | ret = 0; |
1602 | break; | |
1603 | } | |
1604 | ||
30e7a65b | 1605 | out: |
35241d12 LI |
1606 | genpd_unlock(genpd); |
1607 | genpd_unlock(subdomain); | |
f721889f RW |
1608 | |
1609 | return ret; | |
1610 | } | |
d60ee966 | 1611 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1612 | |
59d65b73 LI |
1613 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1614 | { | |
1615 | struct genpd_power_state *state; | |
1616 | ||
1617 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1618 | if (!state) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | genpd->states = state; | |
1622 | genpd->state_count = 1; | |
1623 | genpd->free = state; | |
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
d716f479 LI |
1628 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1629 | { | |
1630 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1631 | spin_lock_init(&genpd->slock); | |
1632 | genpd->lock_ops = &genpd_spin_ops; | |
1633 | } else { | |
1634 | mutex_init(&genpd->mlock); | |
1635 | genpd->lock_ops = &genpd_mtx_ops; | |
1636 | } | |
1637 | } | |
1638 | ||
f721889f RW |
1639 | /** |
1640 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1641 | * @genpd: PM domain object to initialize. | |
1642 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1643 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1644 | * |
1645 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1646 | */ |
7eb231c3 UH |
1647 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1648 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1649 | { |
59d65b73 LI |
1650 | int ret; |
1651 | ||
f721889f | 1652 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1653 | return -EINVAL; |
f721889f | 1654 | |
5063ce15 RW |
1655 | INIT_LIST_HEAD(&genpd->master_links); |
1656 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1657 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1658 | genpd_lock_init(genpd); |
f721889f RW |
1659 | genpd->gov = gov; |
1660 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1661 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1662 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1663 | genpd->device_count = 0; |
221e9b58 | 1664 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1665 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1666 | genpd->provider = NULL; |
1667 | genpd->has_provider = false; | |
afece3ab | 1668 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1669 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1670 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1671 | genpd->domain.ops.prepare = genpd_prepare; |
1672 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1673 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1674 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1675 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1676 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1677 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1678 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1679 | |
1680 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1681 | genpd->dev_ops.stop = pm_clk_suspend; | |
1682 | genpd->dev_ops.start = pm_clk_resume; | |
1683 | } | |
1684 | ||
ffaa42e8 UH |
1685 | /* Always-on domains must be powered on at initialization. */ |
1686 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1687 | return -EINVAL; | |
1688 | ||
fc5cbf0c | 1689 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1690 | if (genpd->state_count == 0) { |
1691 | ret = genpd_set_default_power_state(genpd); | |
1692 | if (ret) | |
1693 | return ret; | |
2c9b7f87 UH |
1694 | } else if (!gov) { |
1695 | pr_warn("%s : no governor for states\n", genpd->name); | |
59d65b73 | 1696 | } |
fc5cbf0c | 1697 | |
401ea157 VK |
1698 | device_initialize(&genpd->dev); |
1699 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1700 | ||
5125bbf3 RW |
1701 | mutex_lock(&gpd_list_lock); |
1702 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1703 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1704 | |
1705 | return 0; | |
5125bbf3 | 1706 | } |
be5ed55d | 1707 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1708 | |
3fe57710 JH |
1709 | static int genpd_remove(struct generic_pm_domain *genpd) |
1710 | { | |
1711 | struct gpd_link *l, *link; | |
1712 | ||
1713 | if (IS_ERR_OR_NULL(genpd)) | |
1714 | return -EINVAL; | |
1715 | ||
35241d12 | 1716 | genpd_lock(genpd); |
3fe57710 JH |
1717 | |
1718 | if (genpd->has_provider) { | |
35241d12 | 1719 | genpd_unlock(genpd); |
3fe57710 JH |
1720 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1721 | return -EBUSY; | |
1722 | } | |
1723 | ||
1724 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1725 | genpd_unlock(genpd); |
3fe57710 JH |
1726 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1727 | return -EBUSY; | |
1728 | } | |
1729 | ||
1730 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1731 | list_del(&link->master_node); | |
1732 | list_del(&link->slave_node); | |
1733 | kfree(link); | |
1734 | } | |
1735 | ||
1736 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1737 | genpd_unlock(genpd); |
3fe57710 | 1738 | cancel_work_sync(&genpd->power_off_work); |
59d65b73 | 1739 | kfree(genpd->free); |
3fe57710 JH |
1740 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | /** | |
1746 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1747 | * @genpd: Pointer to PM domain that is to be removed. | |
1748 | * | |
1749 | * To remove the PM domain, this function: | |
1750 | * - Removes the PM domain as a subdomain to any parent domains, | |
1751 | * if it was added. | |
1752 | * - Removes the PM domain from the list of registered PM domains. | |
1753 | * | |
1754 | * The PM domain will only be removed, if the associated provider has | |
1755 | * been removed, it is not a parent to any other PM domain and has no | |
1756 | * devices associated with it. | |
1757 | */ | |
1758 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1759 | { | |
1760 | int ret; | |
1761 | ||
1762 | mutex_lock(&gpd_list_lock); | |
1763 | ret = genpd_remove(genpd); | |
1764 | mutex_unlock(&gpd_list_lock); | |
1765 | ||
1766 | return ret; | |
1767 | } | |
1768 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1769 | ||
aa42240a | 1770 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1771 | |
aa42240a TF |
1772 | /* |
1773 | * Device Tree based PM domain providers. | |
1774 | * | |
1775 | * The code below implements generic device tree based PM domain providers that | |
1776 | * bind device tree nodes with generic PM domains registered in the system. | |
1777 | * | |
1778 | * Any driver that registers generic PM domains and needs to support binding of | |
1779 | * devices to these domains is supposed to register a PM domain provider, which | |
1780 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1781 | * | |
1782 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1783 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1784 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1785 | * index. |
1786 | */ | |
1787 | ||
1788 | /** | |
1789 | * struct of_genpd_provider - PM domain provider registration structure | |
1790 | * @link: Entry in global list of PM domain providers | |
1791 | * @node: Pointer to device tree node of PM domain provider | |
1792 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1793 | * into a PM domain. | |
1794 | * @data: context pointer to be passed into @xlate callback | |
1795 | */ | |
1796 | struct of_genpd_provider { | |
1797 | struct list_head link; | |
1798 | struct device_node *node; | |
1799 | genpd_xlate_t xlate; | |
1800 | void *data; | |
1801 | }; | |
1802 | ||
1803 | /* List of registered PM domain providers. */ | |
1804 | static LIST_HEAD(of_genpd_providers); | |
1805 | /* Mutex to protect the list above. */ | |
1806 | static DEFINE_MUTEX(of_genpd_mutex); | |
1807 | ||
1808 | /** | |
892ebdcc | 1809 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1810 | * @genpdspec: OF phandle args to map into a PM domain |
1811 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1812 | * | |
1813 | * This is a generic xlate function that can be used to model PM domains that | |
1814 | * have their own device tree nodes. The private data of xlate function needs | |
1815 | * to be a valid pointer to struct generic_pm_domain. | |
1816 | */ | |
892ebdcc | 1817 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1818 | struct of_phandle_args *genpdspec, |
1819 | void *data) | |
1820 | { | |
aa42240a TF |
1821 | return data; |
1822 | } | |
aa42240a TF |
1823 | |
1824 | /** | |
892ebdcc | 1825 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1826 | * @genpdspec: OF phandle args to map into a PM domain |
1827 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1828 | * | |
1829 | * This is a generic xlate function that can be used to model simple PM domain | |
1830 | * controllers that have one device tree node and provide multiple PM domains. | |
1831 | * A single cell is used as an index into an array of PM domains specified in | |
1832 | * the genpd_onecell_data struct when registering the provider. | |
1833 | */ | |
892ebdcc | 1834 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1835 | struct of_phandle_args *genpdspec, |
1836 | void *data) | |
1837 | { | |
1838 | struct genpd_onecell_data *genpd_data = data; | |
1839 | unsigned int idx = genpdspec->args[0]; | |
1840 | ||
1841 | if (genpdspec->args_count != 1) | |
1842 | return ERR_PTR(-EINVAL); | |
1843 | ||
1844 | if (idx >= genpd_data->num_domains) { | |
1845 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1846 | return ERR_PTR(-EINVAL); | |
1847 | } | |
1848 | ||
1849 | if (!genpd_data->domains[idx]) | |
1850 | return ERR_PTR(-ENOENT); | |
1851 | ||
1852 | return genpd_data->domains[idx]; | |
1853 | } | |
aa42240a TF |
1854 | |
1855 | /** | |
892ebdcc | 1856 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1857 | * @np: Device node pointer associated with the PM domain provider. |
1858 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1859 | * @data: Context pointer for @xlate callback. | |
1860 | */ | |
892ebdcc JH |
1861 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1862 | void *data) | |
aa42240a TF |
1863 | { |
1864 | struct of_genpd_provider *cp; | |
1865 | ||
1866 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1867 | if (!cp) | |
1868 | return -ENOMEM; | |
1869 | ||
1870 | cp->node = of_node_get(np); | |
1871 | cp->data = data; | |
1872 | cp->xlate = xlate; | |
1873 | ||
1874 | mutex_lock(&of_genpd_mutex); | |
1875 | list_add(&cp->link, &of_genpd_providers); | |
1876 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1877 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1878 | |
1879 | return 0; | |
1880 | } | |
892ebdcc JH |
1881 | |
1882 | /** | |
1883 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1884 | * @np: Device node pointer associated with the PM domain provider. | |
1885 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1886 | */ | |
1887 | int of_genpd_add_provider_simple(struct device_node *np, | |
1888 | struct generic_pm_domain *genpd) | |
1889 | { | |
0159ec67 JH |
1890 | int ret = -EINVAL; |
1891 | ||
1892 | if (!np || !genpd) | |
1893 | return -EINVAL; | |
1894 | ||
1895 | mutex_lock(&gpd_list_lock); | |
1896 | ||
6a0ae73d VK |
1897 | if (!genpd_present(genpd)) |
1898 | goto unlock; | |
1899 | ||
1900 | genpd->dev.of_node = np; | |
1901 | ||
1902 | /* Parse genpd OPP table */ | |
1903 | if (genpd->set_performance_state) { | |
1904 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
1905 | if (ret) { | |
1906 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
1907 | ret); | |
1908 | goto unlock; | |
8ce95844 | 1909 | } |
de0aa06d JH |
1910 | } |
1911 | ||
6a0ae73d VK |
1912 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
1913 | if (ret) { | |
1914 | if (genpd->set_performance_state) | |
1915 | dev_pm_opp_of_remove_table(&genpd->dev); | |
1916 | ||
1917 | goto unlock; | |
1918 | } | |
1919 | ||
1920 | genpd->provider = &np->fwnode; | |
1921 | genpd->has_provider = true; | |
1922 | ||
1923 | unlock: | |
0159ec67 JH |
1924 | mutex_unlock(&gpd_list_lock); |
1925 | ||
1926 | return ret; | |
892ebdcc JH |
1927 | } |
1928 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
1929 | ||
1930 | /** | |
1931 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
1932 | * @np: Device node pointer associated with the PM domain provider. | |
1933 | * @data: Pointer to the data associated with the PM domain provider. | |
1934 | */ | |
1935 | int of_genpd_add_provider_onecell(struct device_node *np, | |
1936 | struct genpd_onecell_data *data) | |
1937 | { | |
6a0ae73d | 1938 | struct generic_pm_domain *genpd; |
0159ec67 | 1939 | unsigned int i; |
de0aa06d | 1940 | int ret = -EINVAL; |
0159ec67 JH |
1941 | |
1942 | if (!np || !data) | |
1943 | return -EINVAL; | |
1944 | ||
1945 | mutex_lock(&gpd_list_lock); | |
1946 | ||
40845524 TR |
1947 | if (!data->xlate) |
1948 | data->xlate = genpd_xlate_onecell; | |
1949 | ||
0159ec67 | 1950 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
1951 | genpd = data->domains[i]; |
1952 | ||
1953 | if (!genpd) | |
609bed67 | 1954 | continue; |
6a0ae73d | 1955 | if (!genpd_present(genpd)) |
de0aa06d JH |
1956 | goto error; |
1957 | ||
6a0ae73d VK |
1958 | genpd->dev.of_node = np; |
1959 | ||
1960 | /* Parse genpd OPP table */ | |
1961 | if (genpd->set_performance_state) { | |
1962 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
1963 | if (ret) { | |
1964 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
1965 | i, ret); | |
1966 | goto error; | |
1967 | } | |
1968 | } | |
1969 | ||
1970 | genpd->provider = &np->fwnode; | |
1971 | genpd->has_provider = true; | |
0159ec67 JH |
1972 | } |
1973 | ||
40845524 | 1974 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
1975 | if (ret < 0) |
1976 | goto error; | |
1977 | ||
1978 | mutex_unlock(&gpd_list_lock); | |
1979 | ||
1980 | return 0; | |
1981 | ||
1982 | error: | |
1983 | while (i--) { | |
6a0ae73d VK |
1984 | genpd = data->domains[i]; |
1985 | ||
1986 | if (!genpd) | |
609bed67 | 1987 | continue; |
6a0ae73d VK |
1988 | |
1989 | genpd->provider = NULL; | |
1990 | genpd->has_provider = false; | |
1991 | ||
1992 | if (genpd->set_performance_state) | |
1993 | dev_pm_opp_of_remove_table(&genpd->dev); | |
de0aa06d | 1994 | } |
0159ec67 JH |
1995 | |
1996 | mutex_unlock(&gpd_list_lock); | |
1997 | ||
1998 | return ret; | |
892ebdcc JH |
1999 | } |
2000 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2001 | |
2002 | /** | |
2003 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2004 | * @np: Device node pointer associated with the PM domain provider | |
2005 | */ | |
2006 | void of_genpd_del_provider(struct device_node *np) | |
2007 | { | |
b556b15d | 2008 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2009 | struct generic_pm_domain *gpd; |
aa42240a | 2010 | |
de0aa06d | 2011 | mutex_lock(&gpd_list_lock); |
aa42240a | 2012 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2013 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2014 | if (cp->node == np) { |
de0aa06d JH |
2015 | /* |
2016 | * For each PM domain associated with the | |
2017 | * provider, set the 'has_provider' to false | |
2018 | * so that the PM domain can be safely removed. | |
2019 | */ | |
6a0ae73d VK |
2020 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2021 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2022 | gpd->has_provider = false; |
2023 | ||
6a0ae73d VK |
2024 | if (!gpd->set_performance_state) |
2025 | continue; | |
2026 | ||
2027 | dev_pm_opp_of_remove_table(&gpd->dev); | |
2028 | } | |
2029 | } | |
2030 | ||
aa42240a TF |
2031 | list_del(&cp->link); |
2032 | of_node_put(cp->node); | |
2033 | kfree(cp); | |
2034 | break; | |
2035 | } | |
2036 | } | |
2037 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2038 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2039 | } |
2040 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2041 | ||
2042 | /** | |
f58d4e5a | 2043 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2044 | * @genpdspec: OF phandle args to use for look-up |
2045 | * | |
2046 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2047 | * found, uses xlate function of the provider to map phandle args to a PM | |
2048 | * domain. | |
2049 | * | |
2050 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2051 | * on failure. | |
2052 | */ | |
f58d4e5a | 2053 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2054 | struct of_phandle_args *genpdspec) |
2055 | { | |
2056 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2057 | struct of_genpd_provider *provider; | |
2058 | ||
41795a8a JH |
2059 | if (!genpdspec) |
2060 | return ERR_PTR(-EINVAL); | |
2061 | ||
aa42240a TF |
2062 | mutex_lock(&of_genpd_mutex); |
2063 | ||
2064 | /* Check if we have such a provider in our array */ | |
2065 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2066 | if (provider->node == genpdspec->np) | |
2067 | genpd = provider->xlate(genpdspec, provider->data); | |
2068 | if (!IS_ERR(genpd)) | |
2069 | break; | |
2070 | } | |
2071 | ||
2072 | mutex_unlock(&of_genpd_mutex); | |
2073 | ||
2074 | return genpd; | |
2075 | } | |
2076 | ||
ec69572b JH |
2077 | /** |
2078 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2079 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2080 | * @dev: Device to be added. | |
2081 | * | |
2082 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2083 | * the device to the PM domain. Returns a negative error code on failure. | |
2084 | */ | |
2085 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2086 | { | |
2087 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2088 | int ret; |
2089 | ||
2090 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2091 | |
f58d4e5a | 2092 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2093 | if (IS_ERR(genpd)) { |
2094 | ret = PTR_ERR(genpd); | |
2095 | goto out; | |
2096 | } | |
2097 | ||
2098 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 2099 | |
19efa5ff JH |
2100 | out: |
2101 | mutex_unlock(&gpd_list_lock); | |
2102 | ||
2103 | return ret; | |
ec69572b JH |
2104 | } |
2105 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2106 | ||
2107 | /** | |
2108 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2109 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2110 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2111 | * | |
2112 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2113 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2114 | * negative error code on failure. | |
2115 | */ | |
2116 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2117 | struct of_phandle_args *subdomain_spec) | |
2118 | { | |
2119 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2120 | int ret; |
2121 | ||
2122 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2123 | |
f58d4e5a | 2124 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2125 | if (IS_ERR(parent)) { |
2126 | ret = PTR_ERR(parent); | |
2127 | goto out; | |
2128 | } | |
ec69572b | 2129 | |
f58d4e5a | 2130 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2131 | if (IS_ERR(subdomain)) { |
2132 | ret = PTR_ERR(subdomain); | |
2133 | goto out; | |
2134 | } | |
2135 | ||
2136 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2137 | |
19efa5ff JH |
2138 | out: |
2139 | mutex_unlock(&gpd_list_lock); | |
2140 | ||
2141 | return ret; | |
ec69572b JH |
2142 | } |
2143 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2144 | ||
17926551 JH |
2145 | /** |
2146 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2147 | * @provider: Pointer to device structure associated with provider | |
2148 | * | |
2149 | * Find the last PM domain that was added by a particular provider and | |
2150 | * remove this PM domain from the list of PM domains. The provider is | |
2151 | * identified by the 'provider' device structure that is passed. The PM | |
2152 | * domain will only be removed, if the provider associated with domain | |
2153 | * has been removed. | |
2154 | * | |
2155 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2156 | * ERR_PTR() on failure. | |
2157 | */ | |
2158 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2159 | { | |
a7e2d1bc | 2160 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2161 | int ret; |
2162 | ||
2163 | if (IS_ERR_OR_NULL(np)) | |
2164 | return ERR_PTR(-EINVAL); | |
2165 | ||
2166 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2167 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2168 | if (gpd->provider == &np->fwnode) { |
2169 | ret = genpd_remove(gpd); | |
2170 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2171 | break; | |
2172 | } | |
2173 | } | |
2174 | mutex_unlock(&gpd_list_lock); | |
2175 | ||
2176 | return genpd; | |
2177 | } | |
2178 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2179 | ||
3c095f32 UH |
2180 | static void genpd_release_dev(struct device *dev) |
2181 | { | |
2182 | kfree(dev); | |
2183 | } | |
2184 | ||
2185 | static struct bus_type genpd_bus_type = { | |
2186 | .name = "genpd", | |
2187 | }; | |
2188 | ||
aa42240a TF |
2189 | /** |
2190 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2191 | * @dev: Device to detach. |
aa42240a TF |
2192 | * @power_off: Currently not used |
2193 | * | |
2194 | * Try to locate a corresponding generic PM domain, which the device was | |
2195 | * attached to previously. If such is found, the device is detached from it. | |
2196 | */ | |
2197 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2198 | { | |
446d999c | 2199 | struct generic_pm_domain *pd; |
93af5e93 | 2200 | unsigned int i; |
aa42240a TF |
2201 | int ret = 0; |
2202 | ||
85168d56 UH |
2203 | pd = dev_to_genpd(dev); |
2204 | if (IS_ERR(pd)) | |
aa42240a TF |
2205 | return; |
2206 | ||
2207 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2208 | ||
93af5e93 | 2209 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2210 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2211 | if (ret != -EAGAIN) |
2212 | break; | |
93af5e93 GU |
2213 | |
2214 | mdelay(i); | |
aa42240a TF |
2215 | cond_resched(); |
2216 | } | |
2217 | ||
2218 | if (ret < 0) { | |
2219 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2220 | pd->name, ret); | |
2221 | return; | |
2222 | } | |
2223 | ||
2224 | /* Check if PM domain can be powered off after removing this device. */ | |
2225 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2226 | |
2227 | /* Unregister the device if it was created by genpd. */ | |
2228 | if (dev->bus == &genpd_bus_type) | |
2229 | device_unregister(dev); | |
aa42240a TF |
2230 | } |
2231 | ||
632f7ce3 RK |
2232 | static void genpd_dev_pm_sync(struct device *dev) |
2233 | { | |
2234 | struct generic_pm_domain *pd; | |
2235 | ||
2236 | pd = dev_to_genpd(dev); | |
2237 | if (IS_ERR(pd)) | |
2238 | return; | |
2239 | ||
2240 | genpd_queue_power_off_work(pd); | |
2241 | } | |
2242 | ||
8cb1cbd6 | 2243 | static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np, |
895b6612 | 2244 | unsigned int index, bool power_on) |
aa42240a TF |
2245 | { |
2246 | struct of_phandle_args pd_args; | |
2247 | struct generic_pm_domain *pd; | |
2248 | int ret; | |
2249 | ||
8cb1cbd6 UH |
2250 | ret = of_parse_phandle_with_args(np, "power-domains", |
2251 | "#power-domain-cells", index, &pd_args); | |
001d50c9 | 2252 | if (ret < 0) |
bcd931f2 | 2253 | return ret; |
aa42240a | 2254 | |
19efa5ff | 2255 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2256 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2257 | of_node_put(pd_args.np); |
aa42240a | 2258 | if (IS_ERR(pd)) { |
19efa5ff | 2259 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2260 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2261 | __func__, PTR_ERR(pd)); | |
e01afc32 | 2262 | return driver_deferred_probe_check_state(dev); |
aa42240a TF |
2263 | } |
2264 | ||
2265 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2266 | ||
b56d9c91 | 2267 | ret = genpd_add_device(pd, dev, NULL); |
19efa5ff | 2268 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2269 | |
2270 | if (ret < 0) { | |
34994692 GU |
2271 | if (ret != -EPROBE_DEFER) |
2272 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2273 | pd->name, ret); | |
919b7308 | 2274 | return ret; |
aa42240a TF |
2275 | } |
2276 | ||
2277 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2278 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2279 | |
895b6612 UH |
2280 | if (power_on) { |
2281 | genpd_lock(pd); | |
2282 | ret = genpd_power_on(pd, 0); | |
2283 | genpd_unlock(pd); | |
2284 | } | |
72038df3 UH |
2285 | |
2286 | if (ret) | |
2287 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2288 | |
2289 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2290 | } |
8cb1cbd6 UH |
2291 | |
2292 | /** | |
2293 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2294 | * @dev: Device to attach. | |
2295 | * | |
2296 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2297 | * attaches the device to retrieved pm_domain ops. | |
2298 | * | |
2299 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2300 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2301 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2302 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2303 | * not probed and to re-try again later. | |
2304 | */ | |
2305 | int genpd_dev_pm_attach(struct device *dev) | |
2306 | { | |
2307 | if (!dev->of_node) | |
2308 | return 0; | |
2309 | ||
2310 | /* | |
2311 | * Devices with multiple PM domains must be attached separately, as we | |
2312 | * can only attach one PM domain per device. | |
2313 | */ | |
2314 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2315 | "#power-domain-cells") != 1) | |
2316 | return 0; | |
2317 | ||
895b6612 | 2318 | return __genpd_dev_pm_attach(dev, dev->of_node, 0, true); |
8cb1cbd6 | 2319 | } |
aa42240a | 2320 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2321 | |
3c095f32 UH |
2322 | /** |
2323 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2324 | * @dev: The device used to lookup the PM domain. | |
2325 | * @index: The index of the PM domain. | |
2326 | * | |
2327 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2328 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2329 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2330 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2331 | * | |
2332 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2333 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2334 | * failures. If a power-domain exists for the device, but cannot be found or | |
2335 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2336 | * is not probed and to re-try again later. | |
2337 | */ | |
2338 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2339 | unsigned int index) | |
2340 | { | |
560928b2 | 2341 | struct device *virt_dev; |
3c095f32 UH |
2342 | int num_domains; |
2343 | int ret; | |
2344 | ||
2345 | if (!dev->of_node) | |
2346 | return NULL; | |
2347 | ||
2348 | /* Deal only with devices using multiple PM domains. */ | |
2349 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", | |
2350 | "#power-domain-cells"); | |
2351 | if (num_domains < 2 || index >= num_domains) | |
2352 | return NULL; | |
2353 | ||
2354 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2355 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2356 | if (!virt_dev) | |
3c095f32 UH |
2357 | return ERR_PTR(-ENOMEM); |
2358 | ||
560928b2 VK |
2359 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2360 | virt_dev->bus = &genpd_bus_type; | |
2361 | virt_dev->release = genpd_release_dev; | |
3c095f32 | 2362 | |
560928b2 | 2363 | ret = device_register(virt_dev); |
3c095f32 | 2364 | if (ret) { |
560928b2 | 2365 | kfree(virt_dev); |
3c095f32 UH |
2366 | return ERR_PTR(ret); |
2367 | } | |
2368 | ||
2369 | /* Try to attach the device to the PM domain at the specified index. */ | |
560928b2 | 2370 | ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false); |
3c095f32 | 2371 | if (ret < 1) { |
560928b2 | 2372 | device_unregister(virt_dev); |
3c095f32 UH |
2373 | return ret ? ERR_PTR(ret) : NULL; |
2374 | } | |
2375 | ||
560928b2 VK |
2376 | pm_runtime_enable(virt_dev); |
2377 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2378 | |
560928b2 | 2379 | return virt_dev; |
3c095f32 UH |
2380 | } |
2381 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2382 | ||
5d6be70a UH |
2383 | /** |
2384 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2385 | * @dev: The device used to lookup the PM domain. | |
2386 | * @name: The name of the PM domain. | |
2387 | * | |
2388 | * Parse device's OF node to find a PM domain specifier using the | |
2389 | * power-domain-names DT property. For further description see | |
2390 | * genpd_dev_pm_attach_by_id(). | |
2391 | */ | |
2392 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, char *name) | |
2393 | { | |
2394 | int index; | |
2395 | ||
2396 | if (!dev->of_node) | |
2397 | return NULL; | |
2398 | ||
2399 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2400 | name); | |
2401 | if (index < 0) | |
2402 | return NULL; | |
2403 | ||
2404 | return genpd_dev_pm_attach_by_id(dev, index); | |
2405 | } | |
2406 | ||
30f60428 | 2407 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2408 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2409 | { } |
2410 | }; | |
2411 | ||
2412 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2413 | struct device_node *state_node) | |
2414 | { | |
2415 | int err; | |
2416 | u32 residency; | |
2417 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2418 | |
2419 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2420 | &entry_latency); | |
2421 | if (err) { | |
ea11e94b RH |
2422 | pr_debug(" * %pOF missing entry-latency-us property\n", |
2423 | state_node); | |
30f60428 LI |
2424 | return -EINVAL; |
2425 | } | |
2426 | ||
2427 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2428 | &exit_latency); | |
2429 | if (err) { | |
ea11e94b RH |
2430 | pr_debug(" * %pOF missing exit-latency-us property\n", |
2431 | state_node); | |
30f60428 LI |
2432 | return -EINVAL; |
2433 | } | |
2434 | ||
2435 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2436 | if (!err) | |
2437 | genpd_state->residency_ns = 1000 * residency; | |
2438 | ||
2439 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2440 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2441 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2442 | |
2443 | return 0; | |
2444 | } | |
2445 | ||
a3381e3a UH |
2446 | static int genpd_iterate_idle_states(struct device_node *dn, |
2447 | struct genpd_power_state *states) | |
2448 | { | |
2449 | int ret; | |
2450 | struct of_phandle_iterator it; | |
2451 | struct device_node *np; | |
2452 | int i = 0; | |
2453 | ||
2454 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2455 | if (ret <= 0) | |
2456 | return ret; | |
2457 | ||
2458 | /* Loop over the phandles until all the requested entry is found */ | |
2459 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2460 | np = it.node; | |
2461 | if (!of_match_node(idle_state_match, np)) | |
2462 | continue; | |
2463 | if (states) { | |
2464 | ret = genpd_parse_state(&states[i], np); | |
2465 | if (ret) { | |
2466 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2467 | np, ret); | |
2468 | of_node_put(np); | |
2469 | return ret; | |
2470 | } | |
2471 | } | |
2472 | i++; | |
2473 | } | |
2474 | ||
2475 | return i; | |
2476 | } | |
2477 | ||
30f60428 LI |
2478 | /** |
2479 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2480 | * | |
2481 | * @dn: The genpd device node | |
2482 | * @states: The pointer to which the state array will be saved. | |
2483 | * @n: The count of elements in the array returned from this function. | |
2484 | * | |
2485 | * Returns the device states parsed from the OF node. The memory for the states | |
2486 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2487 | * free the memory after use. If any or zero compatible domain idle states is |
2488 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2489 | */ |
2490 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2491 | struct genpd_power_state **states, int *n) | |
2492 | { | |
2493 | struct genpd_power_state *st; | |
a3381e3a | 2494 | int ret; |
30f60428 | 2495 | |
a3381e3a | 2496 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2497 | if (ret < 0) |
2498 | return ret; | |
2499 | ||
2500 | if (!ret) { | |
2501 | *states = NULL; | |
2502 | *n = 0; | |
2503 | return 0; | |
2504 | } | |
30f60428 | 2505 | |
a3381e3a | 2506 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2507 | if (!st) |
2508 | return -ENOMEM; | |
2509 | ||
a3381e3a UH |
2510 | ret = genpd_iterate_idle_states(dn, st); |
2511 | if (ret <= 0) { | |
2512 | kfree(st); | |
2513 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2514 | } |
2515 | ||
a3381e3a UH |
2516 | *states = st; |
2517 | *n = ret; | |
30f60428 LI |
2518 | |
2519 | return 0; | |
2520 | } | |
2521 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2522 | ||
e38f89d3 VK |
2523 | /** |
2524 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2525 | * | |
2526 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2527 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2528 | * state. | |
2529 | * | |
2530 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2531 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2532 | * power domain OPP to performance state. | |
2533 | * | |
2534 | * Returns performance state on success and 0 on failure. | |
2535 | */ | |
2536 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2537 | struct dev_pm_opp *opp) | |
2538 | { | |
2539 | struct generic_pm_domain *genpd = NULL; | |
2540 | int state; | |
2541 | ||
2542 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2543 | ||
2544 | if (unlikely(!genpd->opp_to_performance_state)) | |
2545 | return 0; | |
2546 | ||
2547 | genpd_lock(genpd); | |
2548 | state = genpd->opp_to_performance_state(genpd, opp); | |
2549 | genpd_unlock(genpd); | |
2550 | ||
2551 | return state; | |
2552 | } | |
2553 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2554 | ||
3c095f32 UH |
2555 | static int __init genpd_bus_init(void) |
2556 | { | |
2557 | return bus_register(&genpd_bus_type); | |
2558 | } | |
2559 | core_initcall(genpd_bus_init); | |
2560 | ||
d30d819d | 2561 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2562 | |
2563 | ||
2564 | /*** debugfs support ***/ | |
2565 | ||
8b0510b5 | 2566 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2567 | #include <linux/pm.h> |
2568 | #include <linux/device.h> | |
2569 | #include <linux/debugfs.h> | |
2570 | #include <linux/seq_file.h> | |
2571 | #include <linux/init.h> | |
2572 | #include <linux/kobject.h> | |
9e9704ea | 2573 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2574 | |
2575 | /* | |
2576 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2577 | * from sysfs.c, so generalize it. |
2bd5306a | 2578 | */ |
2bd5306a MM |
2579 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2580 | { | |
2581 | static const char * const status_lookup[] = { | |
2582 | [RPM_ACTIVE] = "active", | |
2583 | [RPM_RESUMING] = "resuming", | |
2584 | [RPM_SUSPENDED] = "suspended", | |
2585 | [RPM_SUSPENDING] = "suspending" | |
2586 | }; | |
2587 | const char *p = ""; | |
2588 | ||
2589 | if (dev->power.runtime_error) | |
2590 | p = "error"; | |
2591 | else if (dev->power.disable_depth) | |
2592 | p = "unsupported"; | |
2593 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2594 | p = status_lookup[dev->power.runtime_status]; | |
2595 | else | |
2596 | WARN_ON(1); | |
2597 | ||
2598 | seq_puts(s, p); | |
2599 | } | |
2bd5306a | 2600 | |
9e9704ea UH |
2601 | static int genpd_summary_one(struct seq_file *s, |
2602 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2603 | { |
2604 | static const char * const status_lookup[] = { | |
2605 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2606 | [GPD_STATE_POWER_OFF] = "off" |
2607 | }; | |
2608 | struct pm_domain_data *pm_data; | |
2609 | const char *kobj_path; | |
2610 | struct gpd_link *link; | |
6954d432 | 2611 | char state[16]; |
2bd5306a MM |
2612 | int ret; |
2613 | ||
35241d12 | 2614 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2615 | if (ret) |
2616 | return -ERESTARTSYS; | |
2617 | ||
66a5ca4b | 2618 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2619 | goto exit; |
41e2c8e0 | 2620 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2621 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2622 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2623 | else |
6954d432 GU |
2624 | snprintf(state, sizeof(state), "%s", |
2625 | status_lookup[genpd->status]); | |
2626 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2627 | |
2628 | /* | |
2629 | * Modifications on the list require holding locks on both | |
2630 | * master and slave, so we are safe. | |
66a5ca4b | 2631 | * Also genpd->name is immutable. |
2bd5306a | 2632 | */ |
66a5ca4b | 2633 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2634 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2635 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2636 | seq_puts(s, ", "); |
2637 | } | |
2638 | ||
66a5ca4b | 2639 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2640 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2641 | genpd_is_irq_safe(genpd) ? | |
2642 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2643 | if (kobj_path == NULL) |
2644 | continue; | |
2645 | ||
2646 | seq_printf(s, "\n %-50s ", kobj_path); | |
2647 | rtpm_status_str(s, pm_data->dev); | |
2648 | kfree(kobj_path); | |
2649 | } | |
2650 | ||
2651 | seq_puts(s, "\n"); | |
2652 | exit: | |
35241d12 | 2653 | genpd_unlock(genpd); |
2bd5306a MM |
2654 | |
2655 | return 0; | |
2656 | } | |
2657 | ||
b6a1d093 | 2658 | static int genpd_summary_show(struct seq_file *s, void *data) |
2bd5306a | 2659 | { |
66a5ca4b | 2660 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2661 | int ret = 0; |
2662 | ||
15dec67a GU |
2663 | seq_puts(s, "domain status slaves\n"); |
2664 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2665 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2666 | ||
2667 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2668 | if (ret) | |
2669 | return -ERESTARTSYS; | |
2670 | ||
66a5ca4b | 2671 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2672 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2673 | if (ret) |
2674 | break; | |
2675 | } | |
2676 | mutex_unlock(&gpd_list_lock); | |
2677 | ||
2678 | return ret; | |
2679 | } | |
2680 | ||
b6a1d093 | 2681 | static int genpd_status_show(struct seq_file *s, void *data) |
2bd5306a | 2682 | { |
b6a1d093 TG |
2683 | static const char * const status_lookup[] = { |
2684 | [GPD_STATE_ACTIVE] = "on", | |
2685 | [GPD_STATE_POWER_OFF] = "off" | |
2686 | }; | |
2687 | ||
2688 | struct generic_pm_domain *genpd = s->private; | |
2689 | int ret = 0; | |
2690 | ||
2691 | ret = genpd_lock_interruptible(genpd); | |
2692 | if (ret) | |
2693 | return -ERESTARTSYS; | |
2694 | ||
2695 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2696 | goto exit; | |
2697 | ||
2698 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2699 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2700 | genpd->state_idx); | |
2701 | else | |
2702 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2703 | exit: | |
2704 | genpd_unlock(genpd); | |
2705 | return ret; | |
2bd5306a MM |
2706 | } |
2707 | ||
b6a1d093 TG |
2708 | static int genpd_sub_domains_show(struct seq_file *s, void *data) |
2709 | { | |
2710 | struct generic_pm_domain *genpd = s->private; | |
2711 | struct gpd_link *link; | |
2712 | int ret = 0; | |
2713 | ||
2714 | ret = genpd_lock_interruptible(genpd); | |
2715 | if (ret) | |
2716 | return -ERESTARTSYS; | |
2717 | ||
2718 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2719 | seq_printf(s, "%s\n", link->slave->name); | |
2720 | ||
2721 | genpd_unlock(genpd); | |
2722 | return ret; | |
2723 | } | |
2724 | ||
2725 | static int genpd_idle_states_show(struct seq_file *s, void *data) | |
2726 | { | |
2727 | struct generic_pm_domain *genpd = s->private; | |
2728 | unsigned int i; | |
2729 | int ret = 0; | |
2730 | ||
2731 | ret = genpd_lock_interruptible(genpd); | |
2732 | if (ret) | |
2733 | return -ERESTARTSYS; | |
2734 | ||
2735 | seq_puts(s, "State Time Spent(ms)\n"); | |
2736 | ||
2737 | for (i = 0; i < genpd->state_count; i++) { | |
2738 | ktime_t delta = 0; | |
2739 | s64 msecs; | |
2740 | ||
2741 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2742 | (genpd->state_idx == i)) | |
2743 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2744 | ||
2745 | msecs = ktime_to_ms( | |
2746 | ktime_add(genpd->states[i].idle_time, delta)); | |
2747 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2748 | } | |
2749 | ||
2750 | genpd_unlock(genpd); | |
2751 | return ret; | |
2752 | } | |
2753 | ||
2754 | static int genpd_active_time_show(struct seq_file *s, void *data) | |
2755 | { | |
2756 | struct generic_pm_domain *genpd = s->private; | |
2757 | ktime_t delta = 0; | |
2758 | int ret = 0; | |
2759 | ||
2760 | ret = genpd_lock_interruptible(genpd); | |
2761 | if (ret) | |
2762 | return -ERESTARTSYS; | |
2763 | ||
2764 | if (genpd->status == GPD_STATE_ACTIVE) | |
2765 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2766 | ||
2767 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2768 | ktime_add(genpd->on_time, delta))); | |
2769 | ||
2770 | genpd_unlock(genpd); | |
2771 | return ret; | |
2772 | } | |
2773 | ||
2774 | static int genpd_total_idle_time_show(struct seq_file *s, void *data) | |
2775 | { | |
2776 | struct generic_pm_domain *genpd = s->private; | |
2777 | ktime_t delta = 0, total = 0; | |
2778 | unsigned int i; | |
2779 | int ret = 0; | |
2780 | ||
2781 | ret = genpd_lock_interruptible(genpd); | |
2782 | if (ret) | |
2783 | return -ERESTARTSYS; | |
2784 | ||
2785 | for (i = 0; i < genpd->state_count; i++) { | |
2786 | ||
2787 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2788 | (genpd->state_idx == i)) | |
2789 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2790 | ||
2791 | total = ktime_add(total, genpd->states[i].idle_time); | |
2792 | } | |
2793 | total = ktime_add(total, delta); | |
2794 | ||
2795 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2796 | ||
2797 | genpd_unlock(genpd); | |
2798 | return ret; | |
2799 | } | |
2800 | ||
2801 | ||
2802 | static int genpd_devices_show(struct seq_file *s, void *data) | |
2803 | { | |
2804 | struct generic_pm_domain *genpd = s->private; | |
2805 | struct pm_domain_data *pm_data; | |
2806 | const char *kobj_path; | |
2807 | int ret = 0; | |
2808 | ||
2809 | ret = genpd_lock_interruptible(genpd); | |
2810 | if (ret) | |
2811 | return -ERESTARTSYS; | |
2812 | ||
2813 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2814 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2815 | genpd_is_irq_safe(genpd) ? | |
2816 | GFP_ATOMIC : GFP_KERNEL); | |
2817 | if (kobj_path == NULL) | |
2818 | continue; | |
2819 | ||
2820 | seq_printf(s, "%s\n", kobj_path); | |
2821 | kfree(kobj_path); | |
2822 | } | |
2823 | ||
2824 | genpd_unlock(genpd); | |
2825 | return ret; | |
2826 | } | |
2827 | ||
e8912812 RN |
2828 | static int genpd_perf_state_show(struct seq_file *s, void *data) |
2829 | { | |
2830 | struct generic_pm_domain *genpd = s->private; | |
2831 | ||
2832 | if (genpd_lock_interruptible(genpd)) | |
2833 | return -ERESTARTSYS; | |
2834 | ||
2835 | seq_printf(s, "%u\n", genpd->performance_state); | |
2836 | ||
2837 | genpd_unlock(genpd); | |
2838 | return 0; | |
2839 | } | |
2840 | ||
b6a1d093 TG |
2841 | #define define_genpd_open_function(name) \ |
2842 | static int genpd_##name##_open(struct inode *inode, struct file *file) \ | |
2843 | { \ | |
2844 | return single_open(file, genpd_##name##_show, inode->i_private); \ | |
2845 | } | |
2846 | ||
2847 | define_genpd_open_function(summary); | |
2848 | define_genpd_open_function(status); | |
2849 | define_genpd_open_function(sub_domains); | |
2850 | define_genpd_open_function(idle_states); | |
2851 | define_genpd_open_function(active_time); | |
2852 | define_genpd_open_function(total_idle_time); | |
2853 | define_genpd_open_function(devices); | |
e8912812 | 2854 | define_genpd_open_function(perf_state); |
b6a1d093 TG |
2855 | |
2856 | #define define_genpd_debugfs_fops(name) \ | |
2857 | static const struct file_operations genpd_##name##_fops = { \ | |
2858 | .open = genpd_##name##_open, \ | |
2859 | .read = seq_read, \ | |
2860 | .llseek = seq_lseek, \ | |
2861 | .release = single_release, \ | |
2862 | } | |
2863 | ||
2864 | define_genpd_debugfs_fops(summary); | |
2865 | define_genpd_debugfs_fops(status); | |
2866 | define_genpd_debugfs_fops(sub_domains); | |
2867 | define_genpd_debugfs_fops(idle_states); | |
2868 | define_genpd_debugfs_fops(active_time); | |
2869 | define_genpd_debugfs_fops(total_idle_time); | |
2870 | define_genpd_debugfs_fops(devices); | |
e8912812 | 2871 | define_genpd_debugfs_fops(perf_state); |
2bd5306a | 2872 | |
9e9704ea | 2873 | static int __init genpd_debug_init(void) |
2bd5306a MM |
2874 | { |
2875 | struct dentry *d; | |
b6a1d093 | 2876 | struct generic_pm_domain *genpd; |
2bd5306a | 2877 | |
9e9704ea | 2878 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 2879 | |
9e9704ea | 2880 | if (!genpd_debugfs_dir) |
2bd5306a MM |
2881 | return -ENOMEM; |
2882 | ||
2883 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
9e9704ea | 2884 | genpd_debugfs_dir, NULL, &genpd_summary_fops); |
2bd5306a MM |
2885 | if (!d) |
2886 | return -ENOMEM; | |
2887 | ||
b6a1d093 | 2888 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2889 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
2890 | if (!d) |
2891 | return -ENOMEM; | |
2892 | ||
2893 | debugfs_create_file("current_state", 0444, | |
2894 | d, genpd, &genpd_status_fops); | |
2895 | debugfs_create_file("sub_domains", 0444, | |
2896 | d, genpd, &genpd_sub_domains_fops); | |
2897 | debugfs_create_file("idle_states", 0444, | |
2898 | d, genpd, &genpd_idle_states_fops); | |
2899 | debugfs_create_file("active_time", 0444, | |
2900 | d, genpd, &genpd_active_time_fops); | |
2901 | debugfs_create_file("total_idle_time", 0444, | |
2902 | d, genpd, &genpd_total_idle_time_fops); | |
2903 | debugfs_create_file("devices", 0444, | |
2904 | d, genpd, &genpd_devices_fops); | |
e8912812 RN |
2905 | if (genpd->set_performance_state) |
2906 | debugfs_create_file("perf_state", 0444, | |
2907 | d, genpd, &genpd_perf_state_fops); | |
b6a1d093 TG |
2908 | } |
2909 | ||
2bd5306a MM |
2910 | return 0; |
2911 | } | |
9e9704ea | 2912 | late_initcall(genpd_debug_init); |
2bd5306a | 2913 | |
9e9704ea | 2914 | static void __exit genpd_debug_exit(void) |
2bd5306a | 2915 | { |
9e9704ea | 2916 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 2917 | } |
9e9704ea | 2918 | __exitcall(genpd_debug_exit); |
8b0510b5 | 2919 | #endif /* CONFIG_DEBUG_FS */ |