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 | ||
7a5bd127 JP |
9 | #define pr_fmt(fmt) "PM: " fmt |
10 | ||
93af5e93 | 11 | #include <linux/delay.h> |
f721889f RW |
12 | #include <linux/kernel.h> |
13 | #include <linux/io.h> | |
aa42240a | 14 | #include <linux/platform_device.h> |
6a0ae73d | 15 | #include <linux/pm_opp.h> |
f721889f RW |
16 | #include <linux/pm_runtime.h> |
17 | #include <linux/pm_domain.h> | |
6ff7bb0d | 18 | #include <linux/pm_qos.h> |
c11f6f5b | 19 | #include <linux/pm_clock.h> |
f721889f RW |
20 | #include <linux/slab.h> |
21 | #include <linux/err.h> | |
17b75eca RW |
22 | #include <linux/sched.h> |
23 | #include <linux/suspend.h> | |
d5e4cbfe | 24 | #include <linux/export.h> |
eb594b73 | 25 | #include <linux/cpu.h> |
d5e4cbfe | 26 | |
aa8e54b5 TV |
27 | #include "power.h" |
28 | ||
93af5e93 GU |
29 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
30 | ||
d5e4cbfe RW |
31 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
32 | ({ \ | |
33 | type (*__routine)(struct device *__d); \ | |
34 | type __ret = (type)0; \ | |
35 | \ | |
36 | __routine = genpd->dev_ops.callback; \ | |
37 | if (__routine) { \ | |
38 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
39 | } \ |
40 | __ret; \ | |
41 | }) | |
f721889f | 42 | |
5125bbf3 RW |
43 | static LIST_HEAD(gpd_list); |
44 | static DEFINE_MUTEX(gpd_list_lock); | |
45 | ||
35241d12 LI |
46 | struct genpd_lock_ops { |
47 | void (*lock)(struct generic_pm_domain *genpd); | |
48 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
49 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
50 | void (*unlock)(struct generic_pm_domain *genpd); | |
51 | }; | |
52 | ||
53 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
54 | { | |
55 | mutex_lock(&genpd->mlock); | |
56 | } | |
57 | ||
58 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
59 | int depth) | |
60 | { | |
61 | mutex_lock_nested(&genpd->mlock, depth); | |
62 | } | |
63 | ||
64 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
65 | { | |
66 | return mutex_lock_interruptible(&genpd->mlock); | |
67 | } | |
68 | ||
69 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
70 | { | |
71 | return mutex_unlock(&genpd->mlock); | |
72 | } | |
73 | ||
74 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
75 | .lock = genpd_lock_mtx, | |
76 | .lock_nested = genpd_lock_nested_mtx, | |
77 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
78 | .unlock = genpd_unlock_mtx, | |
79 | }; | |
80 | ||
d716f479 LI |
81 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
82 | __acquires(&genpd->slock) | |
83 | { | |
84 | unsigned long flags; | |
85 | ||
86 | spin_lock_irqsave(&genpd->slock, flags); | |
87 | genpd->lock_flags = flags; | |
88 | } | |
89 | ||
90 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
91 | int depth) | |
92 | __acquires(&genpd->slock) | |
93 | { | |
94 | unsigned long flags; | |
95 | ||
96 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
97 | genpd->lock_flags = flags; | |
98 | } | |
99 | ||
100 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
101 | __acquires(&genpd->slock) | |
102 | { | |
103 | unsigned long flags; | |
104 | ||
105 | spin_lock_irqsave(&genpd->slock, flags); | |
106 | genpd->lock_flags = flags; | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
111 | __releases(&genpd->slock) | |
112 | { | |
113 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
114 | } | |
115 | ||
116 | static const struct genpd_lock_ops genpd_spin_ops = { | |
117 | .lock = genpd_lock_spin, | |
118 | .lock_nested = genpd_lock_nested_spin, | |
119 | .lock_interruptible = genpd_lock_interruptible_spin, | |
120 | .unlock = genpd_unlock_spin, | |
121 | }; | |
122 | ||
35241d12 LI |
123 | #define genpd_lock(p) p->lock_ops->lock(p) |
124 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
125 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
126 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
127 | ||
41e2c8e0 | 128 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 129 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 130 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 131 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
eb594b73 | 132 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
d716f479 LI |
133 | |
134 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 135 | const struct generic_pm_domain *genpd) |
d716f479 LI |
136 | { |
137 | bool ret; | |
138 | ||
139 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
140 | ||
075c37d5 UH |
141 | /* |
142 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
143 | * to indicate a suboptimal configuration for PM. For an always on | |
144 | * domain this isn't case, thus don't warn. | |
145 | */ | |
146 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
147 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
148 | genpd->name); | |
149 | ||
150 | return ret; | |
151 | } | |
152 | ||
446d999c RK |
153 | /* |
154 | * Get the generic PM domain for a particular struct device. | |
155 | * This validates the struct device pointer, the PM domain pointer, | |
156 | * and checks that the PM domain pointer is a real generic PM domain. | |
157 | * Any failure results in NULL being returned. | |
158 | */ | |
f58d4e5a | 159 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
160 | { |
161 | struct generic_pm_domain *genpd = NULL, *gpd; | |
162 | ||
163 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
164 | return NULL; | |
165 | ||
166 | mutex_lock(&gpd_list_lock); | |
167 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
168 | if (&gpd->domain == dev->pm_domain) { | |
169 | genpd = gpd; | |
170 | break; | |
171 | } | |
172 | } | |
173 | mutex_unlock(&gpd_list_lock); | |
174 | ||
175 | return genpd; | |
176 | } | |
177 | ||
178 | /* | |
179 | * This should only be used where we are certain that the pm_domain | |
180 | * attached to the device is a genpd domain. | |
181 | */ | |
182 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
183 | { |
184 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
185 | return ERR_PTR(-EINVAL); | |
186 | ||
596ba34b | 187 | return pd_to_genpd(dev->pm_domain); |
5248051b | 188 | } |
f721889f | 189 | |
d8600c8b KK |
190 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
191 | struct device *dev) | |
d5e4cbfe | 192 | { |
2b1d88cd | 193 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
194 | } |
195 | ||
d8600c8b KK |
196 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
197 | struct device *dev) | |
d5e4cbfe | 198 | { |
2b1d88cd | 199 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
200 | } |
201 | ||
c4bb3160 | 202 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 203 | { |
c4bb3160 RW |
204 | bool ret = false; |
205 | ||
206 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
207 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
213 | { | |
214 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 215 | smp_mb__after_atomic(); |
f721889f RW |
216 | } |
217 | ||
afece3ab TG |
218 | #ifdef CONFIG_DEBUG_FS |
219 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
220 | { | |
221 | ktime_t delta, now; | |
222 | ||
223 | now = ktime_get(); | |
224 | delta = ktime_sub(now, genpd->accounting_time); | |
225 | ||
226 | /* | |
227 | * If genpd->status is active, it means we are just | |
228 | * out of off and so update the idle time and vice | |
229 | * versa. | |
230 | */ | |
231 | if (genpd->status == GPD_STATE_ACTIVE) { | |
232 | int state_idx = genpd->state_idx; | |
233 | ||
234 | genpd->states[state_idx].idle_time = | |
235 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
236 | } else { | |
237 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
238 | } | |
239 | ||
240 | genpd->accounting_time = now; | |
241 | } | |
242 | #else | |
243 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
244 | #endif | |
245 | ||
cd50c6d3 VK |
246 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
247 | unsigned int state) | |
248 | { | |
249 | struct generic_pm_domain_data *pd_data; | |
250 | struct pm_domain_data *pdd; | |
18edf49c | 251 | struct gpd_link *link; |
cd50c6d3 VK |
252 | |
253 | /* New requested state is same as Max requested state */ | |
254 | if (state == genpd->performance_state) | |
255 | return state; | |
256 | ||
257 | /* New requested state is higher than Max requested state */ | |
258 | if (state > genpd->performance_state) | |
259 | return state; | |
260 | ||
261 | /* Traverse all devices within the domain */ | |
262 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
263 | pd_data = to_gpd_data(pdd); | |
264 | ||
265 | if (pd_data->performance_state > state) | |
266 | state = pd_data->performance_state; | |
267 | } | |
268 | ||
269 | /* | |
18edf49c VK |
270 | * Traverse all sub-domains within the domain. This can be |
271 | * done without any additional locking as the link->performance_state | |
272 | * field is protected by the master genpd->lock, which is already taken. | |
273 | * | |
274 | * Also note that link->performance_state (subdomain's performance state | |
275 | * requirement to master domain) is different from | |
276 | * link->slave->performance_state (current performance state requirement | |
277 | * of the devices/sub-domains of the subdomain) and so can have a | |
278 | * different value. | |
279 | * | |
280 | * Note that we also take vote from powered-off sub-domains into account | |
281 | * as the same is done for devices right now. | |
cd50c6d3 | 282 | */ |
18edf49c VK |
283 | list_for_each_entry(link, &genpd->master_links, master_node) { |
284 | if (link->performance_state > state) | |
285 | state = link->performance_state; | |
286 | } | |
287 | ||
cd50c6d3 VK |
288 | return state; |
289 | } | |
290 | ||
291 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, | |
18edf49c | 292 | unsigned int state, int depth) |
cd50c6d3 | 293 | { |
18edf49c VK |
294 | struct generic_pm_domain *master; |
295 | struct gpd_link *link; | |
296 | int master_state, ret; | |
cd50c6d3 VK |
297 | |
298 | if (state == genpd->performance_state) | |
299 | return 0; | |
300 | ||
18edf49c VK |
301 | /* Propagate to masters of genpd */ |
302 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
303 | master = link->master; | |
304 | ||
305 | if (!master->set_performance_state) | |
306 | continue; | |
307 | ||
308 | /* Find master's performance state */ | |
309 | ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
310 | master->opp_table, | |
311 | state); | |
312 | if (unlikely(ret < 0)) | |
313 | goto err; | |
314 | ||
315 | master_state = ret; | |
316 | ||
317 | genpd_lock_nested(master, depth + 1); | |
318 | ||
319 | link->prev_performance_state = link->performance_state; | |
320 | link->performance_state = master_state; | |
321 | master_state = _genpd_reeval_performance_state(master, | |
322 | master_state); | |
323 | ret = _genpd_set_performance_state(master, master_state, depth + 1); | |
324 | if (ret) | |
325 | link->performance_state = link->prev_performance_state; | |
326 | ||
327 | genpd_unlock(master); | |
328 | ||
329 | if (ret) | |
330 | goto err; | |
331 | } | |
332 | ||
cd50c6d3 VK |
333 | ret = genpd->set_performance_state(genpd, state); |
334 | if (ret) | |
18edf49c | 335 | goto err; |
cd50c6d3 VK |
336 | |
337 | genpd->performance_state = state; | |
338 | return 0; | |
18edf49c VK |
339 | |
340 | err: | |
341 | /* Encountered an error, lets rollback */ | |
342 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, | |
343 | slave_node) { | |
344 | master = link->master; | |
345 | ||
346 | if (!master->set_performance_state) | |
347 | continue; | |
348 | ||
349 | genpd_lock_nested(master, depth + 1); | |
350 | ||
351 | master_state = link->prev_performance_state; | |
352 | link->performance_state = master_state; | |
353 | ||
354 | master_state = _genpd_reeval_performance_state(master, | |
355 | master_state); | |
356 | if (_genpd_set_performance_state(master, master_state, depth + 1)) { | |
357 | pr_err("%s: Failed to roll back to %d performance state\n", | |
358 | master->name, master_state); | |
359 | } | |
360 | ||
361 | genpd_unlock(master); | |
362 | } | |
363 | ||
364 | return ret; | |
cd50c6d3 VK |
365 | } |
366 | ||
42f6284a VK |
367 | /** |
368 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
369 | * domain. | |
370 | * | |
371 | * @dev: Device for which the performance-state needs to be set. | |
372 | * @state: Target performance state of the device. This can be set as 0 when the | |
373 | * device doesn't have any performance state constraints left (And so | |
374 | * the device wouldn't participate anymore to find the target | |
375 | * performance state of the genpd). | |
376 | * | |
377 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
378 | * while this routine is getting called. | |
379 | * | |
380 | * Returns 0 on success and negative error values on failures. | |
381 | */ | |
382 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
383 | { | |
384 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 385 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 386 | unsigned int prev; |
cd50c6d3 | 387 | int ret; |
42f6284a VK |
388 | |
389 | genpd = dev_to_genpd(dev); | |
390 | if (IS_ERR(genpd)) | |
391 | return -ENODEV; | |
392 | ||
393 | if (unlikely(!genpd->set_performance_state)) | |
394 | return -EINVAL; | |
395 | ||
e757e7fa YL |
396 | if (WARN_ON(!dev->power.subsys_data || |
397 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 398 | return -EINVAL; |
42f6284a VK |
399 | |
400 | genpd_lock(genpd); | |
401 | ||
402 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
403 | prev = gpd_data->performance_state; | |
404 | gpd_data->performance_state = state; | |
405 | ||
cd50c6d3 | 406 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 407 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 408 | if (ret) |
68de2fe5 | 409 | gpd_data->performance_state = prev; |
42f6284a | 410 | |
42f6284a VK |
411 | genpd_unlock(genpd); |
412 | ||
413 | return ret; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
416 | ||
86e12eac | 417 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 418 | { |
fc5cbf0c | 419 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
420 | ktime_t time_start; |
421 | s64 elapsed_ns; | |
422 | int ret; | |
423 | ||
424 | if (!genpd->power_on) | |
425 | return 0; | |
426 | ||
a4630c61 GU |
427 | if (!timed) |
428 | return genpd->power_on(genpd); | |
429 | ||
c8f0ea45 GU |
430 | time_start = ktime_get(); |
431 | ret = genpd->power_on(genpd); | |
432 | if (ret) | |
433 | return ret; | |
434 | ||
435 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 436 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
437 | return ret; |
438 | ||
fc5cbf0c | 439 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 440 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
441 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
442 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
443 | |
444 | return ret; | |
445 | } | |
446 | ||
86e12eac | 447 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 448 | { |
fc5cbf0c | 449 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
450 | ktime_t time_start; |
451 | s64 elapsed_ns; | |
452 | int ret; | |
453 | ||
454 | if (!genpd->power_off) | |
455 | return 0; | |
456 | ||
a4630c61 GU |
457 | if (!timed) |
458 | return genpd->power_off(genpd); | |
459 | ||
c8f0ea45 GU |
460 | time_start = ktime_get(); |
461 | ret = genpd->power_off(genpd); | |
0cec68a9 | 462 | if (ret) |
c8f0ea45 GU |
463 | return ret; |
464 | ||
465 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 466 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
0cec68a9 | 467 | return 0; |
c8f0ea45 | 468 | |
fc5cbf0c | 469 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 470 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
471 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
472 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 473 | |
0cec68a9 | 474 | return 0; |
c8f0ea45 GU |
475 | } |
476 | ||
29e47e21 | 477 | /** |
86e12eac | 478 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 479 | * @genpd: PM domain to power off. |
29e47e21 | 480 | * |
86e12eac | 481 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
482 | * before. |
483 | */ | |
484 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
485 | { | |
486 | queue_work(pm_wq, &genpd->power_off_work); | |
487 | } | |
488 | ||
1f8728b7 UH |
489 | /** |
490 | * genpd_power_off - Remove power from a given PM domain. | |
491 | * @genpd: PM domain to power down. | |
3c64649d UH |
492 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
493 | * RPM status of the releated device is in an intermediate state, not yet turned | |
494 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
495 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
496 | * |
497 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
498 | * have been powered down, remove power from @genpd. | |
499 | */ | |
2da83545 UH |
500 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
501 | unsigned int depth) | |
1f8728b7 UH |
502 | { |
503 | struct pm_domain_data *pdd; | |
504 | struct gpd_link *link; | |
505 | unsigned int not_suspended = 0; | |
506 | ||
507 | /* | |
508 | * Do not try to power off the domain in the following situations: | |
509 | * (1) The domain is already in the "power off" state. | |
510 | * (2) System suspend is in progress. | |
511 | */ | |
41e2c8e0 | 512 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
513 | return 0; |
514 | ||
ffaa42e8 UH |
515 | /* |
516 | * Abort power off for the PM domain in the following situations: | |
517 | * (1) The domain is configured as always on. | |
518 | * (2) When the domain has a subdomain being powered on. | |
519 | */ | |
520 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
521 | return -EBUSY; |
522 | ||
523 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
524 | enum pm_qos_flags_status stat; | |
525 | ||
20f97caf | 526 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
527 | if (stat > PM_QOS_FLAGS_NONE) |
528 | return -EBUSY; | |
529 | ||
530 | /* | |
531 | * Do not allow PM domain to be powered off, when an IRQ safe | |
532 | * device is part of a non-IRQ safe domain. | |
533 | */ | |
534 | if (!pm_runtime_suspended(pdd->dev) || | |
535 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
536 | not_suspended++; | |
537 | } | |
538 | ||
3c64649d | 539 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
540 | return -EBUSY; |
541 | ||
542 | if (genpd->gov && genpd->gov->power_down_ok) { | |
543 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
544 | return -EAGAIN; | |
545 | } | |
546 | ||
2c9b7f87 UH |
547 | /* Default to shallowest state. */ |
548 | if (!genpd->gov) | |
549 | genpd->state_idx = 0; | |
550 | ||
1f8728b7 UH |
551 | if (genpd->power_off) { |
552 | int ret; | |
553 | ||
554 | if (atomic_read(&genpd->sd_count) > 0) | |
555 | return -EBUSY; | |
556 | ||
557 | /* | |
558 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
559 | * managed to call genpd_power_on() for the master yet after | |
560 | * incrementing it. In that case genpd_power_on() will wait | |
561 | * for us to drop the lock, so we can call .power_off() and let | |
562 | * the genpd_power_on() restore power for us (this shouldn't | |
563 | * happen very often). | |
564 | */ | |
565 | ret = _genpd_power_off(genpd, true); | |
566 | if (ret) | |
567 | return ret; | |
568 | } | |
569 | ||
570 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 571 | genpd_update_accounting(genpd); |
1f8728b7 UH |
572 | |
573 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
574 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
575 | genpd_lock_nested(link->master, depth + 1); |
576 | genpd_power_off(link->master, false, depth + 1); | |
577 | genpd_unlock(link->master); | |
1f8728b7 UH |
578 | } |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
5248051b | 583 | /** |
86e12eac | 584 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 585 | * @genpd: PM domain to power up. |
0106ef51 | 586 | * @depth: nesting count for lockdep. |
5248051b | 587 | * |
5063ce15 | 588 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
589 | * resume a device belonging to it. |
590 | */ | |
86e12eac | 591 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 592 | { |
5063ce15 | 593 | struct gpd_link *link; |
5248051b RW |
594 | int ret = 0; |
595 | ||
41e2c8e0 | 596 | if (genpd_status_on(genpd)) |
3f241775 | 597 | return 0; |
5248051b | 598 | |
5063ce15 RW |
599 | /* |
600 | * The list is guaranteed not to change while the loop below is being | |
601 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
602 | * with it. | |
603 | */ | |
604 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
605 | struct generic_pm_domain *master = link->master; |
606 | ||
607 | genpd_sd_counter_inc(master); | |
608 | ||
35241d12 | 609 | genpd_lock_nested(master, depth + 1); |
86e12eac | 610 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 611 | genpd_unlock(master); |
5248051b | 612 | |
5063ce15 | 613 | if (ret) { |
0106ef51 | 614 | genpd_sd_counter_dec(master); |
9e08cf42 | 615 | goto err; |
5063ce15 | 616 | } |
5248051b RW |
617 | } |
618 | ||
86e12eac | 619 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
620 | if (ret) |
621 | goto err; | |
5248051b | 622 | |
ba2bbfbf | 623 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
624 | genpd_update_accounting(genpd); |
625 | ||
3f241775 | 626 | return 0; |
9e08cf42 RW |
627 | |
628 | err: | |
29e47e21 UH |
629 | list_for_each_entry_continue_reverse(link, |
630 | &genpd->slave_links, | |
631 | slave_node) { | |
5063ce15 | 632 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
633 | genpd_lock_nested(link->master, depth + 1); |
634 | genpd_power_off(link->master, false, depth + 1); | |
635 | genpd_unlock(link->master); | |
29e47e21 | 636 | } |
9e08cf42 | 637 | |
3f241775 RW |
638 | return ret; |
639 | } | |
640 | ||
6ff7bb0d RW |
641 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
642 | unsigned long val, void *ptr) | |
643 | { | |
644 | struct generic_pm_domain_data *gpd_data; | |
645 | struct device *dev; | |
646 | ||
647 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 648 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
649 | |
650 | for (;;) { | |
651 | struct generic_pm_domain *genpd; | |
652 | struct pm_domain_data *pdd; | |
653 | ||
654 | spin_lock_irq(&dev->power.lock); | |
655 | ||
656 | pdd = dev->power.subsys_data ? | |
657 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 658 | if (pdd) { |
6ff7bb0d RW |
659 | to_gpd_data(pdd)->td.constraint_changed = true; |
660 | genpd = dev_to_genpd(dev); | |
661 | } else { | |
662 | genpd = ERR_PTR(-ENODATA); | |
663 | } | |
664 | ||
665 | spin_unlock_irq(&dev->power.lock); | |
666 | ||
667 | if (!IS_ERR(genpd)) { | |
35241d12 | 668 | genpd_lock(genpd); |
6ff7bb0d | 669 | genpd->max_off_time_changed = true; |
35241d12 | 670 | genpd_unlock(genpd); |
6ff7bb0d RW |
671 | } |
672 | ||
673 | dev = dev->parent; | |
674 | if (!dev || dev->power.ignore_children) | |
675 | break; | |
676 | } | |
677 | ||
678 | return NOTIFY_DONE; | |
679 | } | |
680 | ||
f721889f RW |
681 | /** |
682 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
683 | * @work: Work structure used for scheduling the execution of this function. | |
684 | */ | |
685 | static void genpd_power_off_work_fn(struct work_struct *work) | |
686 | { | |
687 | struct generic_pm_domain *genpd; | |
688 | ||
689 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
690 | ||
35241d12 | 691 | genpd_lock(genpd); |
2da83545 | 692 | genpd_power_off(genpd, false, 0); |
35241d12 | 693 | genpd_unlock(genpd); |
f721889f RW |
694 | } |
695 | ||
54eeddbf UH |
696 | /** |
697 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
698 | * @dev: Device to handle. | |
699 | */ | |
700 | static int __genpd_runtime_suspend(struct device *dev) | |
701 | { | |
702 | int (*cb)(struct device *__dev); | |
703 | ||
704 | if (dev->type && dev->type->pm) | |
705 | cb = dev->type->pm->runtime_suspend; | |
706 | else if (dev->class && dev->class->pm) | |
707 | cb = dev->class->pm->runtime_suspend; | |
708 | else if (dev->bus && dev->bus->pm) | |
709 | cb = dev->bus->pm->runtime_suspend; | |
710 | else | |
711 | cb = NULL; | |
712 | ||
713 | if (!cb && dev->driver && dev->driver->pm) | |
714 | cb = dev->driver->pm->runtime_suspend; | |
715 | ||
716 | return cb ? cb(dev) : 0; | |
717 | } | |
718 | ||
719 | /** | |
720 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
721 | * @dev: Device to handle. | |
722 | */ | |
723 | static int __genpd_runtime_resume(struct device *dev) | |
724 | { | |
725 | int (*cb)(struct device *__dev); | |
726 | ||
727 | if (dev->type && dev->type->pm) | |
728 | cb = dev->type->pm->runtime_resume; | |
729 | else if (dev->class && dev->class->pm) | |
730 | cb = dev->class->pm->runtime_resume; | |
731 | else if (dev->bus && dev->bus->pm) | |
732 | cb = dev->bus->pm->runtime_resume; | |
733 | else | |
734 | cb = NULL; | |
735 | ||
736 | if (!cb && dev->driver && dev->driver->pm) | |
737 | cb = dev->driver->pm->runtime_resume; | |
738 | ||
739 | return cb ? cb(dev) : 0; | |
740 | } | |
741 | ||
f721889f | 742 | /** |
795bd2e7 | 743 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
744 | * @dev: Device to suspend. |
745 | * | |
746 | * Carry out a runtime suspend of a device under the assumption that its | |
747 | * pm_domain field points to the domain member of an object of type | |
748 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
749 | */ | |
795bd2e7 | 750 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
751 | { |
752 | struct generic_pm_domain *genpd; | |
9df3921e | 753 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 754 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 755 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
756 | ktime_t time_start; |
757 | s64 elapsed_ns; | |
d5e4cbfe | 758 | int ret; |
f721889f RW |
759 | |
760 | dev_dbg(dev, "%s()\n", __func__); | |
761 | ||
5248051b RW |
762 | genpd = dev_to_genpd(dev); |
763 | if (IS_ERR(genpd)) | |
f721889f RW |
764 | return -EINVAL; |
765 | ||
ffe12855 UH |
766 | /* |
767 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
768 | * callbacks for other purposes than runtime PM. In those scenarios | |
769 | * runtime PM is disabled. Under these circumstances, we shall skip | |
770 | * validating/measuring the PM QoS latency. | |
771 | */ | |
9df3921e UH |
772 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
773 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
774 | return -EBUSY; |
775 | ||
2b1d88cd | 776 | /* Measure suspend latency. */ |
d33d5a6c | 777 | time_start = 0; |
ffe12855 UH |
778 | if (runtime_pm) |
779 | time_start = ktime_get(); | |
2b1d88cd | 780 | |
54eeddbf | 781 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
782 | if (ret) |
783 | return ret; | |
17b75eca | 784 | |
2b1d88cd | 785 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 786 | if (ret) { |
54eeddbf | 787 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
788 | return ret; |
789 | } | |
790 | ||
2b1d88cd | 791 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
792 | if (runtime_pm) { |
793 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
794 | if (elapsed_ns > td->suspend_latency_ns) { | |
795 | td->suspend_latency_ns = elapsed_ns; | |
796 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
797 | elapsed_ns); | |
798 | genpd->max_off_time_changed = true; | |
799 | td->constraint_changed = true; | |
800 | } | |
2b1d88cd UH |
801 | } |
802 | ||
0aa2a221 | 803 | /* |
d716f479 LI |
804 | * If power.irq_safe is set, this routine may be run with |
805 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 806 | */ |
d716f479 | 807 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
808 | return 0; |
809 | ||
35241d12 | 810 | genpd_lock(genpd); |
2da83545 | 811 | genpd_power_off(genpd, true, 0); |
35241d12 | 812 | genpd_unlock(genpd); |
f721889f RW |
813 | |
814 | return 0; | |
815 | } | |
816 | ||
f721889f | 817 | /** |
795bd2e7 | 818 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
819 | * @dev: Device to resume. |
820 | * | |
821 | * Carry out a runtime resume of a device under the assumption that its | |
822 | * pm_domain field points to the domain member of an object of type | |
823 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
824 | */ | |
795bd2e7 | 825 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
826 | { |
827 | struct generic_pm_domain *genpd; | |
2b1d88cd | 828 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 829 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
830 | ktime_t time_start; |
831 | s64 elapsed_ns; | |
f721889f | 832 | int ret; |
ba2bbfbf | 833 | bool timed = true; |
f721889f RW |
834 | |
835 | dev_dbg(dev, "%s()\n", __func__); | |
836 | ||
5248051b RW |
837 | genpd = dev_to_genpd(dev); |
838 | if (IS_ERR(genpd)) | |
f721889f RW |
839 | return -EINVAL; |
840 | ||
d716f479 LI |
841 | /* |
842 | * As we don't power off a non IRQ safe domain, which holds | |
843 | * an IRQ safe device, we don't need to restore power to it. | |
844 | */ | |
845 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
846 | timed = false; |
847 | goto out; | |
848 | } | |
0aa2a221 | 849 | |
35241d12 | 850 | genpd_lock(genpd); |
86e12eac | 851 | ret = genpd_power_on(genpd, 0); |
35241d12 | 852 | genpd_unlock(genpd); |
c6d22b37 | 853 | |
ba2bbfbf UH |
854 | if (ret) |
855 | return ret; | |
c6d22b37 | 856 | |
ba2bbfbf | 857 | out: |
2b1d88cd | 858 | /* Measure resume latency. */ |
ab51e6ba | 859 | time_start = 0; |
ffe12855 | 860 | if (timed && runtime_pm) |
2b1d88cd UH |
861 | time_start = ktime_get(); |
862 | ||
076395ca LP |
863 | ret = genpd_start_dev(genpd, dev); |
864 | if (ret) | |
865 | goto err_poweroff; | |
866 | ||
54eeddbf | 867 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
868 | if (ret) |
869 | goto err_stop; | |
2b1d88cd UH |
870 | |
871 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 872 | if (timed && runtime_pm) { |
2b1d88cd UH |
873 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
874 | if (elapsed_ns > td->resume_latency_ns) { | |
875 | td->resume_latency_ns = elapsed_ns; | |
876 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
877 | elapsed_ns); | |
878 | genpd->max_off_time_changed = true; | |
879 | td->constraint_changed = true; | |
880 | } | |
881 | } | |
17b75eca | 882 | |
f721889f | 883 | return 0; |
076395ca LP |
884 | |
885 | err_stop: | |
886 | genpd_stop_dev(genpd, dev); | |
887 | err_poweroff: | |
d716f479 LI |
888 | if (!pm_runtime_is_irq_safe(dev) || |
889 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 890 | genpd_lock(genpd); |
2da83545 | 891 | genpd_power_off(genpd, true, 0); |
35241d12 | 892 | genpd_unlock(genpd); |
076395ca LP |
893 | } |
894 | ||
895 | return ret; | |
f721889f RW |
896 | } |
897 | ||
39ac5ba5 TB |
898 | static bool pd_ignore_unused; |
899 | static int __init pd_ignore_unused_setup(char *__unused) | |
900 | { | |
901 | pd_ignore_unused = true; | |
902 | return 1; | |
903 | } | |
904 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
905 | ||
17f2ae7f | 906 | /** |
86e12eac | 907 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 908 | */ |
86e12eac | 909 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
910 | { |
911 | struct generic_pm_domain *genpd; | |
912 | ||
39ac5ba5 TB |
913 | if (pd_ignore_unused) { |
914 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 915 | return 0; |
39ac5ba5 TB |
916 | } |
917 | ||
17f2ae7f RW |
918 | mutex_lock(&gpd_list_lock); |
919 | ||
920 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
921 | genpd_queue_power_off_work(genpd); | |
922 | ||
923 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 924 | |
2fe71dcd UH |
925 | return 0; |
926 | } | |
86e12eac | 927 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 928 | |
0159ec67 | 929 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 930 | |
9e9704ea | 931 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 932 | { |
895b31f3 | 933 | const struct generic_pm_domain *gpd; |
77f827de RW |
934 | |
935 | if (IS_ERR_OR_NULL(genpd)) | |
936 | return false; | |
937 | ||
938 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
939 | if (gpd == genpd) | |
940 | return true; | |
941 | ||
942 | return false; | |
943 | } | |
944 | ||
0159ec67 JH |
945 | #endif |
946 | ||
947 | #ifdef CONFIG_PM_SLEEP | |
948 | ||
596ba34b | 949 | /** |
86e12eac | 950 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 951 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
952 | * @use_lock: use the lock. |
953 | * @depth: nesting count for lockdep. | |
596ba34b RW |
954 | * |
955 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 956 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 957 | * |
77f827de | 958 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
959 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
960 | * these cases the lock must be held. | |
596ba34b | 961 | */ |
0883ac03 UH |
962 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
963 | unsigned int depth) | |
596ba34b | 964 | { |
5063ce15 | 965 | struct gpd_link *link; |
596ba34b | 966 | |
ffaa42e8 | 967 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
968 | return; |
969 | ||
c4bb3160 RW |
970 | if (genpd->suspended_count != genpd->device_count |
971 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
972 | return; |
973 | ||
fc5cbf0c AH |
974 | /* Choose the deepest state when suspending */ |
975 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
976 | if (_genpd_power_off(genpd, false)) |
977 | return; | |
596ba34b | 978 | |
17b75eca | 979 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
980 | |
981 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
982 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
983 | |
984 | if (use_lock) | |
985 | genpd_lock_nested(link->master, depth + 1); | |
986 | ||
987 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
988 | ||
989 | if (use_lock) | |
990 | genpd_unlock(link->master); | |
596ba34b RW |
991 | } |
992 | } | |
993 | ||
802d8b49 | 994 | /** |
86e12eac | 995 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 996 | * @genpd: PM domain to power on. |
0883ac03 UH |
997 | * @use_lock: use the lock. |
998 | * @depth: nesting count for lockdep. | |
802d8b49 | 999 | * |
77f827de | 1000 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1001 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1002 | * these cases the lock must be held. | |
802d8b49 | 1003 | */ |
0883ac03 UH |
1004 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1005 | unsigned int depth) | |
802d8b49 RW |
1006 | { |
1007 | struct gpd_link *link; | |
1008 | ||
41e2c8e0 | 1009 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1010 | return; |
1011 | ||
1012 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 1013 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
1014 | |
1015 | if (use_lock) | |
1016 | genpd_lock_nested(link->master, depth + 1); | |
1017 | ||
1018 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
1019 | ||
1020 | if (use_lock) | |
1021 | genpd_unlock(link->master); | |
802d8b49 RW |
1022 | } |
1023 | ||
86e12eac | 1024 | _genpd_power_on(genpd, false); |
802d8b49 RW |
1025 | |
1026 | genpd->status = GPD_STATE_ACTIVE; | |
1027 | } | |
1028 | ||
4ecd6e65 RW |
1029 | /** |
1030 | * resume_needed - Check whether to resume a device before system suspend. | |
1031 | * @dev: Device to check. | |
1032 | * @genpd: PM domain the device belongs to. | |
1033 | * | |
1034 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1035 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1036 | * to wake up the system and it has to remain active for this purpose while the |
1037 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1038 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1039 | * by itself (those signals are generated on its behalf by other parts of the | |
1040 | * system). In the latter case it may be necessary to reconfigure the device's | |
1041 | * wakeup settings during system suspend, because it may have been set up to | |
1042 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1043 | * Return 'true' in either of the above cases. | |
1044 | */ | |
d8600c8b KK |
1045 | static bool resume_needed(struct device *dev, |
1046 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1047 | { |
1048 | bool active_wakeup; | |
1049 | ||
1050 | if (!device_can_wakeup(dev)) | |
1051 | return false; | |
1052 | ||
d0af45f1 | 1053 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1054 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1055 | } | |
1056 | ||
596ba34b | 1057 | /** |
9e9704ea | 1058 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1059 | * @dev: Device to start the transition of. |
1060 | * | |
1061 | * Start a power transition of a device (during a system-wide power transition) | |
1062 | * under the assumption that its pm_domain field points to the domain member of | |
1063 | * an object of type struct generic_pm_domain representing a PM domain | |
1064 | * consisting of I/O devices. | |
1065 | */ | |
9e9704ea | 1066 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1067 | { |
1068 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1069 | int ret; |
596ba34b RW |
1070 | |
1071 | dev_dbg(dev, "%s()\n", __func__); | |
1072 | ||
1073 | genpd = dev_to_genpd(dev); | |
1074 | if (IS_ERR(genpd)) | |
1075 | return -EINVAL; | |
1076 | ||
17b75eca RW |
1077 | /* |
1078 | * If a wakeup request is pending for the device, it should be woken up | |
1079 | * at this point and a system wakeup event should be reported if it's | |
1080 | * set up to wake up the system from sleep states. | |
1081 | */ | |
4ecd6e65 RW |
1082 | if (resume_needed(dev, genpd)) |
1083 | pm_runtime_resume(dev); | |
1084 | ||
35241d12 | 1085 | genpd_lock(genpd); |
596ba34b | 1086 | |
39dd0f23 | 1087 | if (genpd->prepared_count++ == 0) |
65533bbf | 1088 | genpd->suspended_count = 0; |
17b75eca | 1089 | |
35241d12 | 1090 | genpd_unlock(genpd); |
596ba34b | 1091 | |
b6c10c84 | 1092 | ret = pm_generic_prepare(dev); |
5241ab40 | 1093 | if (ret < 0) { |
35241d12 | 1094 | genpd_lock(genpd); |
b6c10c84 | 1095 | |
39dd0f23 | 1096 | genpd->prepared_count--; |
b6c10c84 | 1097 | |
35241d12 | 1098 | genpd_unlock(genpd); |
b6c10c84 | 1099 | } |
17b75eca | 1100 | |
5241ab40 UH |
1101 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1102 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1103 | } |
1104 | ||
0496c8ae | 1105 | /** |
10da6542 MP |
1106 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1107 | * I/O pm domain. | |
0496c8ae | 1108 | * @dev: Device to suspend. |
10da6542 | 1109 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1110 | * |
1111 | * Stop the device and remove power from the domain if all devices in it have | |
1112 | * been stopped. | |
1113 | */ | |
10da6542 | 1114 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1115 | { |
1116 | struct generic_pm_domain *genpd; | |
a935424b | 1117 | int ret = 0; |
0496c8ae | 1118 | |
0496c8ae RW |
1119 | genpd = dev_to_genpd(dev); |
1120 | if (IS_ERR(genpd)) | |
1121 | return -EINVAL; | |
596ba34b | 1122 | |
10da6542 MP |
1123 | if (poweroff) |
1124 | ret = pm_generic_poweroff_noirq(dev); | |
1125 | else | |
1126 | ret = pm_generic_suspend_noirq(dev); | |
1127 | if (ret) | |
1128 | return ret; | |
1129 | ||
a935424b UH |
1130 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1131 | return 0; | |
1132 | ||
17218e00 RW |
1133 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1134 | !pm_runtime_status_suspended(dev)) { | |
1135 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1136 | if (ret) { |
1137 | if (poweroff) | |
1138 | pm_generic_restore_noirq(dev); | |
1139 | else | |
1140 | pm_generic_resume_noirq(dev); | |
122a2237 | 1141 | return ret; |
a935424b | 1142 | } |
122a2237 UH |
1143 | } |
1144 | ||
0883ac03 | 1145 | genpd_lock(genpd); |
596ba34b | 1146 | genpd->suspended_count++; |
0883ac03 UH |
1147 | genpd_sync_power_off(genpd, true, 0); |
1148 | genpd_unlock(genpd); | |
596ba34b RW |
1149 | |
1150 | return 0; | |
1151 | } | |
1152 | ||
10da6542 | 1153 | /** |
9e9704ea | 1154 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1155 | * @dev: Device to suspend. |
1156 | * | |
1157 | * Stop the device and remove power from the domain if all devices in it have | |
1158 | * been stopped. | |
1159 | */ | |
9e9704ea | 1160 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1161 | { |
1162 | dev_dbg(dev, "%s()\n", __func__); | |
1163 | ||
1164 | return genpd_finish_suspend(dev, false); | |
1165 | } | |
1166 | ||
596ba34b | 1167 | /** |
9e9704ea | 1168 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1169 | * @dev: Device to resume. |
1170 | * | |
0496c8ae | 1171 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1172 | */ |
9e9704ea | 1173 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1174 | { |
1175 | struct generic_pm_domain *genpd; | |
a935424b | 1176 | int ret; |
596ba34b RW |
1177 | |
1178 | dev_dbg(dev, "%s()\n", __func__); | |
1179 | ||
1180 | genpd = dev_to_genpd(dev); | |
1181 | if (IS_ERR(genpd)) | |
1182 | return -EINVAL; | |
1183 | ||
d0af45f1 | 1184 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1185 | return pm_generic_resume_noirq(dev); |
596ba34b | 1186 | |
0883ac03 UH |
1187 | genpd_lock(genpd); |
1188 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1189 | genpd->suspended_count--; |
0883ac03 | 1190 | genpd_unlock(genpd); |
596ba34b | 1191 | |
17218e00 RW |
1192 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1193 | !pm_runtime_status_suspended(dev)) { | |
1194 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1195 | if (ret) |
1196 | return ret; | |
1197 | } | |
122a2237 | 1198 | |
a935424b | 1199 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1200 | } |
1201 | ||
0496c8ae | 1202 | /** |
9e9704ea | 1203 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1204 | * @dev: Device to freeze. |
1205 | * | |
1206 | * Carry out a late freeze of a device under the assumption that its | |
1207 | * pm_domain field points to the domain member of an object of type | |
1208 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1209 | * devices. | |
1210 | */ | |
9e9704ea | 1211 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1212 | { |
d8600c8b | 1213 | const struct generic_pm_domain *genpd; |
122a2237 | 1214 | int ret = 0; |
596ba34b RW |
1215 | |
1216 | dev_dbg(dev, "%s()\n", __func__); | |
1217 | ||
1218 | genpd = dev_to_genpd(dev); | |
1219 | if (IS_ERR(genpd)) | |
1220 | return -EINVAL; | |
1221 | ||
10da6542 MP |
1222 | ret = pm_generic_freeze_noirq(dev); |
1223 | if (ret) | |
1224 | return ret; | |
1225 | ||
17218e00 RW |
1226 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1227 | !pm_runtime_status_suspended(dev)) | |
1228 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1229 | |
1230 | return ret; | |
0496c8ae | 1231 | } |
596ba34b | 1232 | |
0496c8ae | 1233 | /** |
9e9704ea | 1234 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1235 | * @dev: Device to thaw. |
1236 | * | |
1237 | * Start the device, unless power has been removed from the domain already | |
1238 | * before the system transition. | |
1239 | */ | |
9e9704ea | 1240 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1241 | { |
d8600c8b | 1242 | const struct generic_pm_domain *genpd; |
122a2237 | 1243 | int ret = 0; |
596ba34b | 1244 | |
0496c8ae | 1245 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1246 | |
0496c8ae RW |
1247 | genpd = dev_to_genpd(dev); |
1248 | if (IS_ERR(genpd)) | |
1249 | return -EINVAL; | |
1250 | ||
17218e00 RW |
1251 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1252 | !pm_runtime_status_suspended(dev)) { | |
1253 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1254 | if (ret) |
1255 | return ret; | |
1256 | } | |
122a2237 | 1257 | |
10da6542 MP |
1258 | return pm_generic_thaw_noirq(dev); |
1259 | } | |
1260 | ||
1261 | /** | |
9e9704ea | 1262 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1263 | * I/O PM domain. |
1264 | * @dev: Device to poweroff. | |
1265 | * | |
1266 | * Stop the device and remove power from the domain if all devices in it have | |
1267 | * been stopped. | |
1268 | */ | |
9e9704ea | 1269 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1270 | { |
1271 | dev_dbg(dev, "%s()\n", __func__); | |
1272 | ||
1273 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1274 | } |
1275 | ||
596ba34b | 1276 | /** |
9e9704ea | 1277 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1278 | * @dev: Device to resume. |
1279 | * | |
0496c8ae RW |
1280 | * Make sure the domain will be in the same power state as before the |
1281 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1282 | */ |
9e9704ea | 1283 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1284 | { |
1285 | struct generic_pm_domain *genpd; | |
122a2237 | 1286 | int ret = 0; |
596ba34b RW |
1287 | |
1288 | dev_dbg(dev, "%s()\n", __func__); | |
1289 | ||
1290 | genpd = dev_to_genpd(dev); | |
1291 | if (IS_ERR(genpd)) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | /* | |
65533bbf RW |
1295 | * At this point suspended_count == 0 means we are being run for the |
1296 | * first time for the given domain in the present cycle. | |
596ba34b | 1297 | */ |
0883ac03 | 1298 | genpd_lock(genpd); |
39dd0f23 | 1299 | if (genpd->suspended_count++ == 0) |
596ba34b | 1300 | /* |
65533bbf | 1301 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1302 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1303 | * so that it tries to power it on in case it was really off. |
596ba34b | 1304 | */ |
65533bbf | 1305 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1306 | |
0883ac03 UH |
1307 | genpd_sync_power_on(genpd, true, 0); |
1308 | genpd_unlock(genpd); | |
596ba34b | 1309 | |
17218e00 RW |
1310 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1311 | !pm_runtime_status_suspended(dev)) { | |
1312 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1313 | if (ret) |
1314 | return ret; | |
1315 | } | |
122a2237 | 1316 | |
10da6542 | 1317 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1318 | } |
1319 | ||
1320 | /** | |
9e9704ea | 1321 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1322 | * @dev: Device to complete the transition of. |
1323 | * | |
1324 | * Complete a power transition of a device (during a system-wide power | |
1325 | * transition) under the assumption that its pm_domain field points to the | |
1326 | * domain member of an object of type struct generic_pm_domain representing | |
1327 | * a power domain consisting of I/O devices. | |
1328 | */ | |
9e9704ea | 1329 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1330 | { |
1331 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1332 | |
1333 | dev_dbg(dev, "%s()\n", __func__); | |
1334 | ||
1335 | genpd = dev_to_genpd(dev); | |
1336 | if (IS_ERR(genpd)) | |
1337 | return; | |
1338 | ||
4d23a5e8 UH |
1339 | pm_generic_complete(dev); |
1340 | ||
35241d12 | 1341 | genpd_lock(genpd); |
596ba34b | 1342 | |
39dd0f23 | 1343 | genpd->prepared_count--; |
4d23a5e8 UH |
1344 | if (!genpd->prepared_count) |
1345 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1346 | |
35241d12 | 1347 | genpd_unlock(genpd); |
596ba34b RW |
1348 | } |
1349 | ||
77f827de | 1350 | /** |
d47e6464 | 1351 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1352 | * @dev: Device that normally is marked as "always on" to switch power for. |
1353 | * | |
1354 | * This routine may only be called during the system core (syscore) suspend or | |
1355 | * resume phase for devices whose "always on" flags are set. | |
1356 | */ | |
d47e6464 | 1357 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1358 | { |
1359 | struct generic_pm_domain *genpd; | |
1360 | ||
23c6d2c7 | 1361 | genpd = dev_to_genpd(dev); |
9e9704ea | 1362 | if (!genpd_present(genpd)) |
77f827de RW |
1363 | return; |
1364 | ||
1365 | if (suspend) { | |
1366 | genpd->suspended_count++; | |
0883ac03 | 1367 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1368 | } else { |
0883ac03 | 1369 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1370 | genpd->suspended_count--; |
1371 | } | |
1372 | } | |
d47e6464 UH |
1373 | |
1374 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1375 | { | |
1376 | genpd_syscore_switch(dev, true); | |
1377 | } | |
1378 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1379 | ||
1380 | void pm_genpd_syscore_poweron(struct device *dev) | |
1381 | { | |
1382 | genpd_syscore_switch(dev, false); | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1385 | |
d30d819d | 1386 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1387 | |
9e9704ea UH |
1388 | #define genpd_prepare NULL |
1389 | #define genpd_suspend_noirq NULL | |
1390 | #define genpd_resume_noirq NULL | |
1391 | #define genpd_freeze_noirq NULL | |
1392 | #define genpd_thaw_noirq NULL | |
1393 | #define genpd_poweroff_noirq NULL | |
1394 | #define genpd_restore_noirq NULL | |
1395 | #define genpd_complete NULL | |
596ba34b RW |
1396 | |
1397 | #endif /* CONFIG_PM_SLEEP */ | |
1398 | ||
a174920d | 1399 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) |
1d5fcfec RW |
1400 | { |
1401 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1402 | int ret; |
1403 | ||
1404 | ret = dev_pm_get_subsys_data(dev); | |
1405 | if (ret) | |
1406 | return ERR_PTR(ret); | |
1d5fcfec RW |
1407 | |
1408 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1409 | if (!gpd_data) { |
1410 | ret = -ENOMEM; | |
1411 | goto err_put; | |
1412 | } | |
1d5fcfec | 1413 | |
f104e1e5 | 1414 | gpd_data->base.dev = dev; |
f104e1e5 | 1415 | gpd_data->td.constraint_changed = true; |
0759e80b | 1416 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1417 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1418 | ||
1419 | spin_lock_irq(&dev->power.lock); | |
1420 | ||
1421 | if (dev->power.subsys_data->domain_data) { | |
1422 | ret = -EINVAL; | |
1423 | goto err_free; | |
1424 | } | |
1425 | ||
1426 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1427 | |
1428 | spin_unlock_irq(&dev->power.lock); | |
1429 | ||
1d5fcfec | 1430 | return gpd_data; |
3e235685 | 1431 | |
f104e1e5 UH |
1432 | err_free: |
1433 | spin_unlock_irq(&dev->power.lock); | |
1434 | kfree(gpd_data); | |
3e235685 UH |
1435 | err_put: |
1436 | dev_pm_put_subsys_data(dev); | |
1437 | return ERR_PTR(ret); | |
1d5fcfec RW |
1438 | } |
1439 | ||
49d400c7 UH |
1440 | static void genpd_free_dev_data(struct device *dev, |
1441 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1442 | { |
f104e1e5 UH |
1443 | spin_lock_irq(&dev->power.lock); |
1444 | ||
f104e1e5 UH |
1445 | dev->power.subsys_data->domain_data = NULL; |
1446 | ||
1447 | spin_unlock_irq(&dev->power.lock); | |
1448 | ||
1d5fcfec | 1449 | kfree(gpd_data); |
3e235685 | 1450 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1451 | } |
1452 | ||
b24e1965 UH |
1453 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1454 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1455 | { |
1456 | struct gpd_link *link; | |
1457 | ||
1458 | if (!genpd_is_cpu_domain(genpd)) | |
1459 | return; | |
1460 | ||
1461 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
1462 | struct generic_pm_domain *master = link->master; | |
1463 | ||
1464 | genpd_lock_nested(master, depth + 1); | |
b24e1965 | 1465 | genpd_update_cpumask(master, cpu, set, depth + 1); |
eb594b73 UH |
1466 | genpd_unlock(master); |
1467 | } | |
1468 | ||
1469 | if (set) | |
1470 | cpumask_set_cpu(cpu, genpd->cpus); | |
1471 | else | |
1472 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1473 | } | |
1474 | ||
b24e1965 UH |
1475 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1476 | { | |
1477 | if (cpu >= 0) | |
1478 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1479 | } | |
1480 | ||
1481 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1482 | { | |
1483 | if (cpu >= 0) | |
1484 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1485 | } | |
1486 | ||
1487 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1488 | { |
1489 | int cpu; | |
1490 | ||
1491 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1492 | return -1; |
eb594b73 UH |
1493 | |
1494 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1495 | if (get_cpu_device(cpu) == dev) |
1496 | return cpu; | |
eb594b73 | 1497 | } |
eb594b73 | 1498 | |
b24e1965 | 1499 | return -1; |
eb594b73 UH |
1500 | } |
1501 | ||
a174920d | 1502 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
f721889f | 1503 | { |
c0356db7 | 1504 | struct generic_pm_domain_data *gpd_data; |
b24e1965 | 1505 | int ret, cpu; |
f721889f RW |
1506 | |
1507 | dev_dbg(dev, "%s()\n", __func__); | |
1508 | ||
1509 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1510 | return -EINVAL; | |
1511 | ||
a174920d | 1512 | gpd_data = genpd_alloc_dev_data(dev); |
3e235685 UH |
1513 | if (IS_ERR(gpd_data)) |
1514 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1515 | |
b24e1965 UH |
1516 | cpu = genpd_get_cpu(genpd, dev); |
1517 | ||
b472c2fa UH |
1518 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1519 | if (ret) | |
1520 | goto out; | |
d79b6fe1 | 1521 | |
2071ac98 JW |
1522 | genpd_lock(genpd); |
1523 | ||
b24e1965 | 1524 | genpd_set_cpumask(genpd, cpu); |
975e83cf SH |
1525 | dev_pm_domain_set(dev, &genpd->domain); |
1526 | ||
14b53064 UH |
1527 | genpd->device_count++; |
1528 | genpd->max_off_time_changed = true; | |
1529 | ||
1d5fcfec | 1530 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1531 | |
35241d12 | 1532 | genpd_unlock(genpd); |
2071ac98 | 1533 | out: |
c0356db7 UH |
1534 | if (ret) |
1535 | genpd_free_dev_data(dev, gpd_data); | |
1536 | else | |
1537 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1538 | |
f721889f RW |
1539 | return ret; |
1540 | } | |
19efa5ff JH |
1541 | |
1542 | /** | |
1a7a6707 | 1543 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1544 | * @genpd: PM domain to add the device to. |
1545 | * @dev: Device to be added. | |
19efa5ff | 1546 | */ |
1a7a6707 | 1547 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1548 | { |
1549 | int ret; | |
1550 | ||
1551 | mutex_lock(&gpd_list_lock); | |
a174920d | 1552 | ret = genpd_add_device(genpd, dev); |
19efa5ff JH |
1553 | mutex_unlock(&gpd_list_lock); |
1554 | ||
1555 | return ret; | |
1556 | } | |
1a7a6707 | 1557 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1558 | |
85168d56 UH |
1559 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1560 | struct device *dev) | |
f721889f | 1561 | { |
6ff7bb0d | 1562 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1563 | struct pm_domain_data *pdd; |
b24e1965 | 1564 | int cpu, ret = 0; |
f721889f RW |
1565 | |
1566 | dev_dbg(dev, "%s()\n", __func__); | |
1567 | ||
c0356db7 UH |
1568 | pdd = dev->power.subsys_data->domain_data; |
1569 | gpd_data = to_gpd_data(pdd); | |
1570 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
b24e1965 | 1571 | cpu = genpd_get_cpu(genpd, dev); |
c0356db7 | 1572 | |
35241d12 | 1573 | genpd_lock(genpd); |
f721889f | 1574 | |
596ba34b RW |
1575 | if (genpd->prepared_count > 0) { |
1576 | ret = -EAGAIN; | |
1577 | goto out; | |
1578 | } | |
1579 | ||
6ff7bb0d RW |
1580 | genpd->device_count--; |
1581 | genpd->max_off_time_changed = true; | |
1582 | ||
b24e1965 | 1583 | genpd_clear_cpumask(genpd, cpu); |
975e83cf SH |
1584 | dev_pm_domain_set(dev, NULL); |
1585 | ||
efa69025 | 1586 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1587 | |
35241d12 | 1588 | genpd_unlock(genpd); |
6ff7bb0d | 1589 | |
2071ac98 JW |
1590 | if (genpd->detach_dev) |
1591 | genpd->detach_dev(genpd, dev); | |
1592 | ||
c1dbe2fb | 1593 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1594 | |
6ff7bb0d | 1595 | return 0; |
f721889f | 1596 | |
596ba34b | 1597 | out: |
35241d12 | 1598 | genpd_unlock(genpd); |
c0356db7 | 1599 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1600 | |
1601 | return ret; | |
1602 | } | |
85168d56 UH |
1603 | |
1604 | /** | |
1605 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1606 | * @dev: Device to be removed. |
1607 | */ | |
924f4486 | 1608 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1609 | { |
924f4486 UH |
1610 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1611 | ||
1612 | if (!genpd) | |
85168d56 UH |
1613 | return -EINVAL; |
1614 | ||
1615 | return genpd_remove_device(genpd, dev); | |
1616 | } | |
24c96dc7 | 1617 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1618 | |
19efa5ff JH |
1619 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1620 | struct generic_pm_domain *subdomain) | |
f721889f | 1621 | { |
2547923d | 1622 | struct gpd_link *link, *itr; |
f721889f RW |
1623 | int ret = 0; |
1624 | ||
fb7268be RW |
1625 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1626 | || genpd == subdomain) | |
f721889f RW |
1627 | return -EINVAL; |
1628 | ||
d716f479 LI |
1629 | /* |
1630 | * If the domain can be powered on/off in an IRQ safe | |
1631 | * context, ensure that the subdomain can also be | |
1632 | * powered on/off in that context. | |
1633 | */ | |
1634 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1635 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1636 | genpd->name, subdomain->name); |
1637 | return -EINVAL; | |
1638 | } | |
1639 | ||
2547923d LI |
1640 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1641 | if (!link) | |
1642 | return -ENOMEM; | |
1643 | ||
35241d12 LI |
1644 | genpd_lock(subdomain); |
1645 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1646 | |
41e2c8e0 | 1647 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1648 | ret = -EINVAL; |
1649 | goto out; | |
1650 | } | |
1651 | ||
2547923d LI |
1652 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1653 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1654 | ret = -EINVAL; |
1655 | goto out; | |
1656 | } | |
1657 | } | |
1658 | ||
5063ce15 RW |
1659 | link->master = genpd; |
1660 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1661 | link->slave = subdomain; |
1662 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1663 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1664 | genpd_sd_counter_inc(genpd); |
f721889f | 1665 | |
f721889f | 1666 | out: |
35241d12 LI |
1667 | genpd_unlock(genpd); |
1668 | genpd_unlock(subdomain); | |
2547923d LI |
1669 | if (ret) |
1670 | kfree(link); | |
f721889f RW |
1671 | return ret; |
1672 | } | |
19efa5ff JH |
1673 | |
1674 | /** | |
1675 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1676 | * @genpd: Master PM domain to add the subdomain to. | |
1677 | * @subdomain: Subdomain to be added. | |
1678 | */ | |
1679 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1680 | struct generic_pm_domain *subdomain) | |
1681 | { | |
1682 | int ret; | |
1683 | ||
1684 | mutex_lock(&gpd_list_lock); | |
1685 | ret = genpd_add_subdomain(genpd, subdomain); | |
1686 | mutex_unlock(&gpd_list_lock); | |
1687 | ||
1688 | return ret; | |
1689 | } | |
d60ee966 | 1690 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1691 | |
1692 | /** | |
1693 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1694 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1695 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1696 | */ |
1697 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1698 | struct generic_pm_domain *subdomain) |
f721889f | 1699 | { |
c6e83cac | 1700 | struct gpd_link *l, *link; |
f721889f RW |
1701 | int ret = -EINVAL; |
1702 | ||
5063ce15 | 1703 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1704 | return -EINVAL; |
1705 | ||
35241d12 LI |
1706 | genpd_lock(subdomain); |
1707 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1708 | |
beda5fc1 | 1709 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
7a5bd127 JP |
1710 | pr_warn("%s: unable to remove subdomain %s\n", |
1711 | genpd->name, subdomain->name); | |
30e7a65b JH |
1712 | ret = -EBUSY; |
1713 | goto out; | |
1714 | } | |
1715 | ||
c6e83cac | 1716 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1717 | if (link->slave != subdomain) |
f721889f RW |
1718 | continue; |
1719 | ||
5063ce15 RW |
1720 | list_del(&link->master_node); |
1721 | list_del(&link->slave_node); | |
1722 | kfree(link); | |
41e2c8e0 | 1723 | if (genpd_status_on(subdomain)) |
f721889f RW |
1724 | genpd_sd_counter_dec(genpd); |
1725 | ||
f721889f RW |
1726 | ret = 0; |
1727 | break; | |
1728 | } | |
1729 | ||
30e7a65b | 1730 | out: |
35241d12 LI |
1731 | genpd_unlock(genpd); |
1732 | genpd_unlock(subdomain); | |
f721889f RW |
1733 | |
1734 | return ret; | |
1735 | } | |
d60ee966 | 1736 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1737 | |
49a27e27 UH |
1738 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1739 | unsigned int state_count) | |
1740 | { | |
1741 | kfree(states); | |
1742 | } | |
1743 | ||
59d65b73 LI |
1744 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1745 | { | |
1746 | struct genpd_power_state *state; | |
1747 | ||
1748 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1749 | if (!state) | |
1750 | return -ENOMEM; | |
1751 | ||
1752 | genpd->states = state; | |
1753 | genpd->state_count = 1; | |
49a27e27 | 1754 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1755 | |
1756 | return 0; | |
1757 | } | |
1758 | ||
d716f479 LI |
1759 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1760 | { | |
1761 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1762 | spin_lock_init(&genpd->slock); | |
1763 | genpd->lock_ops = &genpd_spin_ops; | |
1764 | } else { | |
1765 | mutex_init(&genpd->mlock); | |
1766 | genpd->lock_ops = &genpd_mtx_ops; | |
1767 | } | |
1768 | } | |
1769 | ||
f721889f RW |
1770 | /** |
1771 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1772 | * @genpd: PM domain object to initialize. | |
1773 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1774 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1775 | * |
1776 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1777 | */ |
7eb231c3 UH |
1778 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1779 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1780 | { |
59d65b73 LI |
1781 | int ret; |
1782 | ||
f721889f | 1783 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1784 | return -EINVAL; |
f721889f | 1785 | |
5063ce15 RW |
1786 | INIT_LIST_HEAD(&genpd->master_links); |
1787 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1788 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1789 | genpd_lock_init(genpd); |
f721889f RW |
1790 | genpd->gov = gov; |
1791 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1792 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1793 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1794 | genpd->device_count = 0; |
221e9b58 | 1795 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1796 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1797 | genpd->provider = NULL; |
1798 | genpd->has_provider = false; | |
afece3ab | 1799 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1800 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1801 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1802 | genpd->domain.ops.prepare = genpd_prepare; |
1803 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1804 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1805 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1806 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1807 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1808 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1809 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1810 | |
1811 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1812 | genpd->dev_ops.stop = pm_clk_suspend; | |
1813 | genpd->dev_ops.start = pm_clk_resume; | |
1814 | } | |
1815 | ||
ffaa42e8 UH |
1816 | /* Always-on domains must be powered on at initialization. */ |
1817 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1818 | return -EINVAL; | |
1819 | ||
eb594b73 UH |
1820 | if (genpd_is_cpu_domain(genpd) && |
1821 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
1822 | return -ENOMEM; | |
1823 | ||
fc5cbf0c | 1824 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1825 | if (genpd->state_count == 0) { |
1826 | ret = genpd_set_default_power_state(genpd); | |
eb594b73 UH |
1827 | if (ret) { |
1828 | if (genpd_is_cpu_domain(genpd)) | |
1829 | free_cpumask_var(genpd->cpus); | |
59d65b73 | 1830 | return ret; |
eb594b73 | 1831 | } |
46b7fe94 | 1832 | } else if (!gov && genpd->state_count > 1) { |
7a5bd127 | 1833 | pr_warn("%s: no governor for states\n", genpd->name); |
59d65b73 | 1834 | } |
fc5cbf0c | 1835 | |
401ea157 VK |
1836 | device_initialize(&genpd->dev); |
1837 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1838 | ||
5125bbf3 RW |
1839 | mutex_lock(&gpd_list_lock); |
1840 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1841 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1842 | |
1843 | return 0; | |
5125bbf3 | 1844 | } |
be5ed55d | 1845 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1846 | |
3fe57710 JH |
1847 | static int genpd_remove(struct generic_pm_domain *genpd) |
1848 | { | |
1849 | struct gpd_link *l, *link; | |
1850 | ||
1851 | if (IS_ERR_OR_NULL(genpd)) | |
1852 | return -EINVAL; | |
1853 | ||
35241d12 | 1854 | genpd_lock(genpd); |
3fe57710 JH |
1855 | |
1856 | if (genpd->has_provider) { | |
35241d12 | 1857 | genpd_unlock(genpd); |
3fe57710 JH |
1858 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1859 | return -EBUSY; | |
1860 | } | |
1861 | ||
1862 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1863 | genpd_unlock(genpd); |
3fe57710 JH |
1864 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1865 | return -EBUSY; | |
1866 | } | |
1867 | ||
1868 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1869 | list_del(&link->master_node); | |
1870 | list_del(&link->slave_node); | |
1871 | kfree(link); | |
1872 | } | |
1873 | ||
1874 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1875 | genpd_unlock(genpd); |
3fe57710 | 1876 | cancel_work_sync(&genpd->power_off_work); |
eb594b73 UH |
1877 | if (genpd_is_cpu_domain(genpd)) |
1878 | free_cpumask_var(genpd->cpus); | |
49a27e27 UH |
1879 | if (genpd->free_states) |
1880 | genpd->free_states(genpd->states, genpd->state_count); | |
1881 | ||
3fe57710 JH |
1882 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1883 | ||
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | /** | |
1888 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1889 | * @genpd: Pointer to PM domain that is to be removed. | |
1890 | * | |
1891 | * To remove the PM domain, this function: | |
1892 | * - Removes the PM domain as a subdomain to any parent domains, | |
1893 | * if it was added. | |
1894 | * - Removes the PM domain from the list of registered PM domains. | |
1895 | * | |
1896 | * The PM domain will only be removed, if the associated provider has | |
1897 | * been removed, it is not a parent to any other PM domain and has no | |
1898 | * devices associated with it. | |
1899 | */ | |
1900 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1901 | { | |
1902 | int ret; | |
1903 | ||
1904 | mutex_lock(&gpd_list_lock); | |
1905 | ret = genpd_remove(genpd); | |
1906 | mutex_unlock(&gpd_list_lock); | |
1907 | ||
1908 | return ret; | |
1909 | } | |
1910 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1911 | ||
aa42240a | 1912 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1913 | |
aa42240a TF |
1914 | /* |
1915 | * Device Tree based PM domain providers. | |
1916 | * | |
1917 | * The code below implements generic device tree based PM domain providers that | |
1918 | * bind device tree nodes with generic PM domains registered in the system. | |
1919 | * | |
1920 | * Any driver that registers generic PM domains and needs to support binding of | |
1921 | * devices to these domains is supposed to register a PM domain provider, which | |
1922 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1923 | * | |
1924 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1925 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1926 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1927 | * index. |
1928 | */ | |
1929 | ||
1930 | /** | |
1931 | * struct of_genpd_provider - PM domain provider registration structure | |
1932 | * @link: Entry in global list of PM domain providers | |
1933 | * @node: Pointer to device tree node of PM domain provider | |
1934 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1935 | * into a PM domain. | |
1936 | * @data: context pointer to be passed into @xlate callback | |
1937 | */ | |
1938 | struct of_genpd_provider { | |
1939 | struct list_head link; | |
1940 | struct device_node *node; | |
1941 | genpd_xlate_t xlate; | |
1942 | void *data; | |
1943 | }; | |
1944 | ||
1945 | /* List of registered PM domain providers. */ | |
1946 | static LIST_HEAD(of_genpd_providers); | |
1947 | /* Mutex to protect the list above. */ | |
1948 | static DEFINE_MUTEX(of_genpd_mutex); | |
1949 | ||
1950 | /** | |
892ebdcc | 1951 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1952 | * @genpdspec: OF phandle args to map into a PM domain |
1953 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1954 | * | |
1955 | * This is a generic xlate function that can be used to model PM domains that | |
1956 | * have their own device tree nodes. The private data of xlate function needs | |
1957 | * to be a valid pointer to struct generic_pm_domain. | |
1958 | */ | |
892ebdcc | 1959 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1960 | struct of_phandle_args *genpdspec, |
1961 | void *data) | |
1962 | { | |
aa42240a TF |
1963 | return data; |
1964 | } | |
aa42240a TF |
1965 | |
1966 | /** | |
892ebdcc | 1967 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1968 | * @genpdspec: OF phandle args to map into a PM domain |
1969 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1970 | * | |
1971 | * This is a generic xlate function that can be used to model simple PM domain | |
1972 | * controllers that have one device tree node and provide multiple PM domains. | |
1973 | * A single cell is used as an index into an array of PM domains specified in | |
1974 | * the genpd_onecell_data struct when registering the provider. | |
1975 | */ | |
892ebdcc | 1976 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1977 | struct of_phandle_args *genpdspec, |
1978 | void *data) | |
1979 | { | |
1980 | struct genpd_onecell_data *genpd_data = data; | |
1981 | unsigned int idx = genpdspec->args[0]; | |
1982 | ||
1983 | if (genpdspec->args_count != 1) | |
1984 | return ERR_PTR(-EINVAL); | |
1985 | ||
1986 | if (idx >= genpd_data->num_domains) { | |
1987 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1988 | return ERR_PTR(-EINVAL); | |
1989 | } | |
1990 | ||
1991 | if (!genpd_data->domains[idx]) | |
1992 | return ERR_PTR(-ENOENT); | |
1993 | ||
1994 | return genpd_data->domains[idx]; | |
1995 | } | |
aa42240a TF |
1996 | |
1997 | /** | |
892ebdcc | 1998 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1999 | * @np: Device node pointer associated with the PM domain provider. |
2000 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2001 | * @data: Context pointer for @xlate callback. | |
2002 | */ | |
892ebdcc JH |
2003 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2004 | void *data) | |
aa42240a TF |
2005 | { |
2006 | struct of_genpd_provider *cp; | |
2007 | ||
2008 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2009 | if (!cp) | |
2010 | return -ENOMEM; | |
2011 | ||
2012 | cp->node = of_node_get(np); | |
2013 | cp->data = data; | |
2014 | cp->xlate = xlate; | |
2015 | ||
2016 | mutex_lock(&of_genpd_mutex); | |
2017 | list_add(&cp->link, &of_genpd_providers); | |
2018 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2019 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2020 | |
2021 | return 0; | |
2022 | } | |
892ebdcc JH |
2023 | |
2024 | /** | |
2025 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2026 | * @np: Device node pointer associated with the PM domain provider. | |
2027 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2028 | */ | |
2029 | int of_genpd_add_provider_simple(struct device_node *np, | |
2030 | struct generic_pm_domain *genpd) | |
2031 | { | |
0159ec67 JH |
2032 | int ret = -EINVAL; |
2033 | ||
2034 | if (!np || !genpd) | |
2035 | return -EINVAL; | |
2036 | ||
2037 | mutex_lock(&gpd_list_lock); | |
2038 | ||
6a0ae73d VK |
2039 | if (!genpd_present(genpd)) |
2040 | goto unlock; | |
2041 | ||
2042 | genpd->dev.of_node = np; | |
2043 | ||
2044 | /* Parse genpd OPP table */ | |
2045 | if (genpd->set_performance_state) { | |
2046 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
2047 | if (ret) { | |
2048 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
2049 | ret); | |
2050 | goto unlock; | |
8ce95844 | 2051 | } |
1067ae3e VK |
2052 | |
2053 | /* | |
2054 | * Save table for faster processing while setting performance | |
2055 | * state. | |
2056 | */ | |
2057 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
2058 | WARN_ON(!genpd->opp_table); | |
de0aa06d JH |
2059 | } |
2060 | ||
6a0ae73d VK |
2061 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2062 | if (ret) { | |
1067ae3e VK |
2063 | if (genpd->set_performance_state) { |
2064 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2065 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2066 | } |
6a0ae73d VK |
2067 | |
2068 | goto unlock; | |
2069 | } | |
2070 | ||
2071 | genpd->provider = &np->fwnode; | |
2072 | genpd->has_provider = true; | |
2073 | ||
2074 | unlock: | |
0159ec67 JH |
2075 | mutex_unlock(&gpd_list_lock); |
2076 | ||
2077 | return ret; | |
892ebdcc JH |
2078 | } |
2079 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2080 | ||
2081 | /** | |
2082 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2083 | * @np: Device node pointer associated with the PM domain provider. | |
2084 | * @data: Pointer to the data associated with the PM domain provider. | |
2085 | */ | |
2086 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2087 | struct genpd_onecell_data *data) | |
2088 | { | |
6a0ae73d | 2089 | struct generic_pm_domain *genpd; |
0159ec67 | 2090 | unsigned int i; |
de0aa06d | 2091 | int ret = -EINVAL; |
0159ec67 JH |
2092 | |
2093 | if (!np || !data) | |
2094 | return -EINVAL; | |
2095 | ||
2096 | mutex_lock(&gpd_list_lock); | |
2097 | ||
40845524 TR |
2098 | if (!data->xlate) |
2099 | data->xlate = genpd_xlate_onecell; | |
2100 | ||
0159ec67 | 2101 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2102 | genpd = data->domains[i]; |
2103 | ||
2104 | if (!genpd) | |
609bed67 | 2105 | continue; |
6a0ae73d | 2106 | if (!genpd_present(genpd)) |
de0aa06d JH |
2107 | goto error; |
2108 | ||
6a0ae73d VK |
2109 | genpd->dev.of_node = np; |
2110 | ||
2111 | /* Parse genpd OPP table */ | |
2112 | if (genpd->set_performance_state) { | |
2113 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2114 | if (ret) { | |
2115 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2116 | i, ret); | |
2117 | goto error; | |
2118 | } | |
1067ae3e VK |
2119 | |
2120 | /* | |
2121 | * Save table for faster processing while setting | |
2122 | * performance state. | |
2123 | */ | |
2124 | genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); | |
2125 | WARN_ON(!genpd->opp_table); | |
6a0ae73d VK |
2126 | } |
2127 | ||
2128 | genpd->provider = &np->fwnode; | |
2129 | genpd->has_provider = true; | |
0159ec67 JH |
2130 | } |
2131 | ||
40845524 | 2132 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2133 | if (ret < 0) |
2134 | goto error; | |
2135 | ||
2136 | mutex_unlock(&gpd_list_lock); | |
2137 | ||
2138 | return 0; | |
2139 | ||
2140 | error: | |
2141 | while (i--) { | |
6a0ae73d VK |
2142 | genpd = data->domains[i]; |
2143 | ||
2144 | if (!genpd) | |
609bed67 | 2145 | continue; |
6a0ae73d VK |
2146 | |
2147 | genpd->provider = NULL; | |
2148 | genpd->has_provider = false; | |
2149 | ||
1067ae3e VK |
2150 | if (genpd->set_performance_state) { |
2151 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2152 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2153 | } |
de0aa06d | 2154 | } |
0159ec67 JH |
2155 | |
2156 | mutex_unlock(&gpd_list_lock); | |
2157 | ||
2158 | return ret; | |
892ebdcc JH |
2159 | } |
2160 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2161 | |
2162 | /** | |
2163 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2164 | * @np: Device node pointer associated with the PM domain provider | |
2165 | */ | |
2166 | void of_genpd_del_provider(struct device_node *np) | |
2167 | { | |
b556b15d | 2168 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2169 | struct generic_pm_domain *gpd; |
aa42240a | 2170 | |
de0aa06d | 2171 | mutex_lock(&gpd_list_lock); |
aa42240a | 2172 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2173 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2174 | if (cp->node == np) { |
de0aa06d JH |
2175 | /* |
2176 | * For each PM domain associated with the | |
2177 | * provider, set the 'has_provider' to false | |
2178 | * so that the PM domain can be safely removed. | |
2179 | */ | |
6a0ae73d VK |
2180 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2181 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2182 | gpd->has_provider = false; |
2183 | ||
6a0ae73d VK |
2184 | if (!gpd->set_performance_state) |
2185 | continue; | |
2186 | ||
1067ae3e | 2187 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2188 | dev_pm_opp_of_remove_table(&gpd->dev); |
2189 | } | |
2190 | } | |
2191 | ||
aa42240a TF |
2192 | list_del(&cp->link); |
2193 | of_node_put(cp->node); | |
2194 | kfree(cp); | |
2195 | break; | |
2196 | } | |
2197 | } | |
2198 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2199 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2200 | } |
2201 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2202 | ||
2203 | /** | |
f58d4e5a | 2204 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2205 | * @genpdspec: OF phandle args to use for look-up |
2206 | * | |
2207 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2208 | * found, uses xlate function of the provider to map phandle args to a PM | |
2209 | * domain. | |
2210 | * | |
2211 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2212 | * on failure. | |
2213 | */ | |
f58d4e5a | 2214 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2215 | struct of_phandle_args *genpdspec) |
2216 | { | |
2217 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2218 | struct of_genpd_provider *provider; | |
2219 | ||
41795a8a JH |
2220 | if (!genpdspec) |
2221 | return ERR_PTR(-EINVAL); | |
2222 | ||
aa42240a TF |
2223 | mutex_lock(&of_genpd_mutex); |
2224 | ||
2225 | /* Check if we have such a provider in our array */ | |
2226 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2227 | if (provider->node == genpdspec->np) | |
2228 | genpd = provider->xlate(genpdspec, provider->data); | |
2229 | if (!IS_ERR(genpd)) | |
2230 | break; | |
2231 | } | |
2232 | ||
2233 | mutex_unlock(&of_genpd_mutex); | |
2234 | ||
2235 | return genpd; | |
2236 | } | |
2237 | ||
ec69572b JH |
2238 | /** |
2239 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2240 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2241 | * @dev: Device to be added. | |
2242 | * | |
2243 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2244 | * the device to the PM domain. Returns a negative error code on failure. | |
2245 | */ | |
2246 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2247 | { | |
2248 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2249 | int ret; |
2250 | ||
2251 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2252 | |
f58d4e5a | 2253 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2254 | if (IS_ERR(genpd)) { |
2255 | ret = PTR_ERR(genpd); | |
2256 | goto out; | |
2257 | } | |
2258 | ||
a174920d | 2259 | ret = genpd_add_device(genpd, dev); |
ec69572b | 2260 | |
19efa5ff JH |
2261 | out: |
2262 | mutex_unlock(&gpd_list_lock); | |
2263 | ||
2264 | return ret; | |
ec69572b JH |
2265 | } |
2266 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2267 | ||
2268 | /** | |
2269 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2270 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2271 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2272 | * | |
2273 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2274 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2275 | * negative error code on failure. | |
2276 | */ | |
2277 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2278 | struct of_phandle_args *subdomain_spec) | |
2279 | { | |
2280 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2281 | int ret; |
2282 | ||
2283 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2284 | |
f58d4e5a | 2285 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2286 | if (IS_ERR(parent)) { |
2287 | ret = PTR_ERR(parent); | |
2288 | goto out; | |
2289 | } | |
ec69572b | 2290 | |
f58d4e5a | 2291 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2292 | if (IS_ERR(subdomain)) { |
2293 | ret = PTR_ERR(subdomain); | |
2294 | goto out; | |
2295 | } | |
2296 | ||
2297 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2298 | |
19efa5ff JH |
2299 | out: |
2300 | mutex_unlock(&gpd_list_lock); | |
2301 | ||
2302 | return ret; | |
ec69572b JH |
2303 | } |
2304 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2305 | ||
17926551 JH |
2306 | /** |
2307 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2308 | * @provider: Pointer to device structure associated with provider | |
2309 | * | |
2310 | * Find the last PM domain that was added by a particular provider and | |
2311 | * remove this PM domain from the list of PM domains. The provider is | |
2312 | * identified by the 'provider' device structure that is passed. The PM | |
2313 | * domain will only be removed, if the provider associated with domain | |
2314 | * has been removed. | |
2315 | * | |
2316 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2317 | * ERR_PTR() on failure. | |
2318 | */ | |
2319 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2320 | { | |
a7e2d1bc | 2321 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2322 | int ret; |
2323 | ||
2324 | if (IS_ERR_OR_NULL(np)) | |
2325 | return ERR_PTR(-EINVAL); | |
2326 | ||
2327 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2328 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2329 | if (gpd->provider == &np->fwnode) { |
2330 | ret = genpd_remove(gpd); | |
2331 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2332 | break; | |
2333 | } | |
2334 | } | |
2335 | mutex_unlock(&gpd_list_lock); | |
2336 | ||
2337 | return genpd; | |
2338 | } | |
2339 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2340 | ||
3c095f32 UH |
2341 | static void genpd_release_dev(struct device *dev) |
2342 | { | |
e8b04de9 | 2343 | of_node_put(dev->of_node); |
3c095f32 UH |
2344 | kfree(dev); |
2345 | } | |
2346 | ||
2347 | static struct bus_type genpd_bus_type = { | |
2348 | .name = "genpd", | |
2349 | }; | |
2350 | ||
aa42240a TF |
2351 | /** |
2352 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2353 | * @dev: Device to detach. |
aa42240a TF |
2354 | * @power_off: Currently not used |
2355 | * | |
2356 | * Try to locate a corresponding generic PM domain, which the device was | |
2357 | * attached to previously. If such is found, the device is detached from it. | |
2358 | */ | |
2359 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2360 | { | |
446d999c | 2361 | struct generic_pm_domain *pd; |
93af5e93 | 2362 | unsigned int i; |
aa42240a TF |
2363 | int ret = 0; |
2364 | ||
85168d56 UH |
2365 | pd = dev_to_genpd(dev); |
2366 | if (IS_ERR(pd)) | |
aa42240a TF |
2367 | return; |
2368 | ||
2369 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2370 | ||
93af5e93 | 2371 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2372 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2373 | if (ret != -EAGAIN) |
2374 | break; | |
93af5e93 GU |
2375 | |
2376 | mdelay(i); | |
aa42240a TF |
2377 | cond_resched(); |
2378 | } | |
2379 | ||
2380 | if (ret < 0) { | |
2381 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2382 | pd->name, ret); | |
2383 | return; | |
2384 | } | |
2385 | ||
2386 | /* Check if PM domain can be powered off after removing this device. */ | |
2387 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2388 | |
2389 | /* Unregister the device if it was created by genpd. */ | |
2390 | if (dev->bus == &genpd_bus_type) | |
2391 | device_unregister(dev); | |
aa42240a TF |
2392 | } |
2393 | ||
632f7ce3 RK |
2394 | static void genpd_dev_pm_sync(struct device *dev) |
2395 | { | |
2396 | struct generic_pm_domain *pd; | |
2397 | ||
2398 | pd = dev_to_genpd(dev); | |
2399 | if (IS_ERR(pd)) | |
2400 | return; | |
2401 | ||
2402 | genpd_queue_power_off_work(pd); | |
2403 | } | |
2404 | ||
51dcf748 UH |
2405 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2406 | unsigned int index, bool power_on) | |
aa42240a TF |
2407 | { |
2408 | struct of_phandle_args pd_args; | |
2409 | struct generic_pm_domain *pd; | |
2410 | int ret; | |
2411 | ||
e8b04de9 | 2412 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2413 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2414 | if (ret < 0) |
bcd931f2 | 2415 | return ret; |
aa42240a | 2416 | |
19efa5ff | 2417 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2418 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2419 | of_node_put(pd_args.np); |
aa42240a | 2420 | if (IS_ERR(pd)) { |
19efa5ff | 2421 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2422 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2423 | __func__, PTR_ERR(pd)); | |
51dcf748 | 2424 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2425 | } |
2426 | ||
2427 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2428 | ||
a174920d | 2429 | ret = genpd_add_device(pd, dev); |
19efa5ff | 2430 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2431 | |
2432 | if (ret < 0) { | |
34994692 GU |
2433 | if (ret != -EPROBE_DEFER) |
2434 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2435 | pd->name, ret); | |
919b7308 | 2436 | return ret; |
aa42240a TF |
2437 | } |
2438 | ||
2439 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2440 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2441 | |
895b6612 UH |
2442 | if (power_on) { |
2443 | genpd_lock(pd); | |
2444 | ret = genpd_power_on(pd, 0); | |
2445 | genpd_unlock(pd); | |
2446 | } | |
72038df3 UH |
2447 | |
2448 | if (ret) | |
2449 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2450 | |
2451 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2452 | } |
8cb1cbd6 UH |
2453 | |
2454 | /** | |
2455 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2456 | * @dev: Device to attach. | |
2457 | * | |
2458 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2459 | * attaches the device to retrieved pm_domain ops. | |
2460 | * | |
2461 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2462 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2463 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2464 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2465 | * not probed and to re-try again later. | |
2466 | */ | |
2467 | int genpd_dev_pm_attach(struct device *dev) | |
2468 | { | |
2469 | if (!dev->of_node) | |
2470 | return 0; | |
2471 | ||
2472 | /* | |
2473 | * Devices with multiple PM domains must be attached separately, as we | |
2474 | * can only attach one PM domain per device. | |
2475 | */ | |
2476 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2477 | "#power-domain-cells") != 1) | |
2478 | return 0; | |
2479 | ||
51dcf748 | 2480 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2481 | } |
aa42240a | 2482 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2483 | |
3c095f32 UH |
2484 | /** |
2485 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2486 | * @dev: The device used to lookup the PM domain. | |
2487 | * @index: The index of the PM domain. | |
2488 | * | |
2489 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2490 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2491 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2492 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2493 | * | |
2494 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2495 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2496 | * failures. If a power-domain exists for the device, but cannot be found or | |
2497 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2498 | * is not probed and to re-try again later. | |
2499 | */ | |
2500 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2501 | unsigned int index) | |
2502 | { | |
560928b2 | 2503 | struct device *virt_dev; |
3c095f32 UH |
2504 | int num_domains; |
2505 | int ret; | |
2506 | ||
2507 | if (!dev->of_node) | |
2508 | return NULL; | |
2509 | ||
3ccf3f0c | 2510 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2511 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2512 | "#power-domain-cells"); | |
3ccf3f0c | 2513 | if (index >= num_domains) |
3c095f32 UH |
2514 | return NULL; |
2515 | ||
2516 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2517 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2518 | if (!virt_dev) | |
3c095f32 UH |
2519 | return ERR_PTR(-ENOMEM); |
2520 | ||
560928b2 VK |
2521 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2522 | virt_dev->bus = &genpd_bus_type; | |
2523 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2524 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2525 | |
560928b2 | 2526 | ret = device_register(virt_dev); |
3c095f32 | 2527 | if (ret) { |
71b77697 | 2528 | put_device(virt_dev); |
3c095f32 UH |
2529 | return ERR_PTR(ret); |
2530 | } | |
2531 | ||
2532 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2533 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2534 | if (ret < 1) { |
560928b2 | 2535 | device_unregister(virt_dev); |
3c095f32 UH |
2536 | return ret ? ERR_PTR(ret) : NULL; |
2537 | } | |
2538 | ||
560928b2 VK |
2539 | pm_runtime_enable(virt_dev); |
2540 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2541 | |
560928b2 | 2542 | return virt_dev; |
3c095f32 UH |
2543 | } |
2544 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2545 | ||
5d6be70a UH |
2546 | /** |
2547 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2548 | * @dev: The device used to lookup the PM domain. | |
2549 | * @name: The name of the PM domain. | |
2550 | * | |
2551 | * Parse device's OF node to find a PM domain specifier using the | |
2552 | * power-domain-names DT property. For further description see | |
2553 | * genpd_dev_pm_attach_by_id(). | |
2554 | */ | |
7416f1f2 | 2555 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2556 | { |
2557 | int index; | |
2558 | ||
2559 | if (!dev->of_node) | |
2560 | return NULL; | |
2561 | ||
2562 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2563 | name); | |
2564 | if (index < 0) | |
2565 | return NULL; | |
2566 | ||
2567 | return genpd_dev_pm_attach_by_id(dev, index); | |
2568 | } | |
2569 | ||
30f60428 | 2570 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2571 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2572 | { } |
2573 | }; | |
2574 | ||
2575 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2576 | struct device_node *state_node) | |
2577 | { | |
2578 | int err; | |
2579 | u32 residency; | |
2580 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2581 | |
2582 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2583 | &entry_latency); | |
2584 | if (err) { | |
ea11e94b | 2585 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2586 | state_node); |
30f60428 LI |
2587 | return -EINVAL; |
2588 | } | |
2589 | ||
2590 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2591 | &exit_latency); | |
2592 | if (err) { | |
ea11e94b | 2593 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2594 | state_node); |
30f60428 LI |
2595 | return -EINVAL; |
2596 | } | |
2597 | ||
2598 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2599 | if (!err) | |
2600 | genpd_state->residency_ns = 1000 * residency; | |
2601 | ||
2602 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2603 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2604 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2605 | |
2606 | return 0; | |
2607 | } | |
2608 | ||
a3381e3a UH |
2609 | static int genpd_iterate_idle_states(struct device_node *dn, |
2610 | struct genpd_power_state *states) | |
2611 | { | |
2612 | int ret; | |
2613 | struct of_phandle_iterator it; | |
2614 | struct device_node *np; | |
2615 | int i = 0; | |
2616 | ||
2617 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2618 | if (ret <= 0) | |
2619 | return ret; | |
2620 | ||
2621 | /* Loop over the phandles until all the requested entry is found */ | |
2622 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2623 | np = it.node; | |
2624 | if (!of_match_node(idle_state_match, np)) | |
2625 | continue; | |
2626 | if (states) { | |
2627 | ret = genpd_parse_state(&states[i], np); | |
2628 | if (ret) { | |
2629 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2630 | np, ret); | |
2631 | of_node_put(np); | |
2632 | return ret; | |
2633 | } | |
2634 | } | |
2635 | i++; | |
2636 | } | |
2637 | ||
2638 | return i; | |
2639 | } | |
2640 | ||
30f60428 LI |
2641 | /** |
2642 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2643 | * | |
2644 | * @dn: The genpd device node | |
2645 | * @states: The pointer to which the state array will be saved. | |
2646 | * @n: The count of elements in the array returned from this function. | |
2647 | * | |
2648 | * Returns the device states parsed from the OF node. The memory for the states | |
2649 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2650 | * free the memory after use. If any or zero compatible domain idle states is |
2651 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2652 | */ |
2653 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2654 | struct genpd_power_state **states, int *n) | |
2655 | { | |
2656 | struct genpd_power_state *st; | |
a3381e3a | 2657 | int ret; |
30f60428 | 2658 | |
a3381e3a | 2659 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2660 | if (ret < 0) |
2661 | return ret; | |
2662 | ||
2663 | if (!ret) { | |
2664 | *states = NULL; | |
2665 | *n = 0; | |
2666 | return 0; | |
2667 | } | |
30f60428 | 2668 | |
a3381e3a | 2669 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2670 | if (!st) |
2671 | return -ENOMEM; | |
2672 | ||
a3381e3a UH |
2673 | ret = genpd_iterate_idle_states(dn, st); |
2674 | if (ret <= 0) { | |
2675 | kfree(st); | |
2676 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2677 | } |
2678 | ||
a3381e3a UH |
2679 | *states = st; |
2680 | *n = ret; | |
30f60428 LI |
2681 | |
2682 | return 0; | |
2683 | } | |
2684 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2685 | ||
e38f89d3 VK |
2686 | /** |
2687 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2688 | * | |
2689 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2690 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2691 | * state. | |
2692 | * | |
2693 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2694 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2695 | * power domain OPP to performance state. | |
2696 | * | |
2697 | * Returns performance state on success and 0 on failure. | |
2698 | */ | |
2699 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2700 | struct dev_pm_opp *opp) | |
2701 | { | |
2702 | struct generic_pm_domain *genpd = NULL; | |
2703 | int state; | |
2704 | ||
2705 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2706 | ||
2707 | if (unlikely(!genpd->opp_to_performance_state)) | |
2708 | return 0; | |
2709 | ||
2710 | genpd_lock(genpd); | |
2711 | state = genpd->opp_to_performance_state(genpd, opp); | |
2712 | genpd_unlock(genpd); | |
2713 | ||
2714 | return state; | |
2715 | } | |
2716 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2717 | ||
3c095f32 UH |
2718 | static int __init genpd_bus_init(void) |
2719 | { | |
2720 | return bus_register(&genpd_bus_type); | |
2721 | } | |
2722 | core_initcall(genpd_bus_init); | |
2723 | ||
d30d819d | 2724 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2725 | |
2726 | ||
2727 | /*** debugfs support ***/ | |
2728 | ||
8b0510b5 | 2729 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2730 | #include <linux/pm.h> |
2731 | #include <linux/device.h> | |
2732 | #include <linux/debugfs.h> | |
2733 | #include <linux/seq_file.h> | |
2734 | #include <linux/init.h> | |
2735 | #include <linux/kobject.h> | |
9e9704ea | 2736 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2737 | |
2738 | /* | |
2739 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2740 | * from sysfs.c, so generalize it. |
2bd5306a | 2741 | */ |
2bd5306a MM |
2742 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2743 | { | |
2744 | static const char * const status_lookup[] = { | |
2745 | [RPM_ACTIVE] = "active", | |
2746 | [RPM_RESUMING] = "resuming", | |
2747 | [RPM_SUSPENDED] = "suspended", | |
2748 | [RPM_SUSPENDING] = "suspending" | |
2749 | }; | |
2750 | const char *p = ""; | |
2751 | ||
2752 | if (dev->power.runtime_error) | |
2753 | p = "error"; | |
2754 | else if (dev->power.disable_depth) | |
2755 | p = "unsupported"; | |
2756 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2757 | p = status_lookup[dev->power.runtime_status]; | |
2758 | else | |
2759 | WARN_ON(1); | |
2760 | ||
2761 | seq_puts(s, p); | |
2762 | } | |
2bd5306a | 2763 | |
9e9704ea UH |
2764 | static int genpd_summary_one(struct seq_file *s, |
2765 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2766 | { |
2767 | static const char * const status_lookup[] = { | |
2768 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2769 | [GPD_STATE_POWER_OFF] = "off" |
2770 | }; | |
2771 | struct pm_domain_data *pm_data; | |
2772 | const char *kobj_path; | |
2773 | struct gpd_link *link; | |
6954d432 | 2774 | char state[16]; |
2bd5306a MM |
2775 | int ret; |
2776 | ||
35241d12 | 2777 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2778 | if (ret) |
2779 | return -ERESTARTSYS; | |
2780 | ||
66a5ca4b | 2781 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2782 | goto exit; |
41e2c8e0 | 2783 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2784 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2785 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2786 | else |
6954d432 GU |
2787 | snprintf(state, sizeof(state), "%s", |
2788 | status_lookup[genpd->status]); | |
2789 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2790 | |
2791 | /* | |
2792 | * Modifications on the list require holding locks on both | |
2793 | * master and slave, so we are safe. | |
66a5ca4b | 2794 | * Also genpd->name is immutable. |
2bd5306a | 2795 | */ |
66a5ca4b | 2796 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2797 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2798 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2799 | seq_puts(s, ", "); |
2800 | } | |
2801 | ||
66a5ca4b | 2802 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2803 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2804 | genpd_is_irq_safe(genpd) ? | |
2805 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2806 | if (kobj_path == NULL) |
2807 | continue; | |
2808 | ||
2809 | seq_printf(s, "\n %-50s ", kobj_path); | |
2810 | rtpm_status_str(s, pm_data->dev); | |
2811 | kfree(kobj_path); | |
2812 | } | |
2813 | ||
2814 | seq_puts(s, "\n"); | |
2815 | exit: | |
35241d12 | 2816 | genpd_unlock(genpd); |
2bd5306a MM |
2817 | |
2818 | return 0; | |
2819 | } | |
2820 | ||
d32dcc6c | 2821 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 2822 | { |
66a5ca4b | 2823 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2824 | int ret = 0; |
2825 | ||
15dec67a GU |
2826 | seq_puts(s, "domain status slaves\n"); |
2827 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2828 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2829 | ||
2830 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2831 | if (ret) | |
2832 | return -ERESTARTSYS; | |
2833 | ||
66a5ca4b | 2834 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2835 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2836 | if (ret) |
2837 | break; | |
2838 | } | |
2839 | mutex_unlock(&gpd_list_lock); | |
2840 | ||
2841 | return ret; | |
2842 | } | |
2843 | ||
d32dcc6c | 2844 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 2845 | { |
b6a1d093 TG |
2846 | static const char * const status_lookup[] = { |
2847 | [GPD_STATE_ACTIVE] = "on", | |
2848 | [GPD_STATE_POWER_OFF] = "off" | |
2849 | }; | |
2850 | ||
2851 | struct generic_pm_domain *genpd = s->private; | |
2852 | int ret = 0; | |
2853 | ||
2854 | ret = genpd_lock_interruptible(genpd); | |
2855 | if (ret) | |
2856 | return -ERESTARTSYS; | |
2857 | ||
2858 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2859 | goto exit; | |
2860 | ||
2861 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2862 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2863 | genpd->state_idx); | |
2864 | else | |
2865 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2866 | exit: | |
2867 | genpd_unlock(genpd); | |
2868 | return ret; | |
2bd5306a MM |
2869 | } |
2870 | ||
d32dcc6c | 2871 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2872 | { |
2873 | struct generic_pm_domain *genpd = s->private; | |
2874 | struct gpd_link *link; | |
2875 | int ret = 0; | |
2876 | ||
2877 | ret = genpd_lock_interruptible(genpd); | |
2878 | if (ret) | |
2879 | return -ERESTARTSYS; | |
2880 | ||
2881 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2882 | seq_printf(s, "%s\n", link->slave->name); | |
2883 | ||
2884 | genpd_unlock(genpd); | |
2885 | return ret; | |
2886 | } | |
2887 | ||
d32dcc6c | 2888 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2889 | { |
2890 | struct generic_pm_domain *genpd = s->private; | |
2891 | unsigned int i; | |
2892 | int ret = 0; | |
2893 | ||
2894 | ret = genpd_lock_interruptible(genpd); | |
2895 | if (ret) | |
2896 | return -ERESTARTSYS; | |
2897 | ||
2898 | seq_puts(s, "State Time Spent(ms)\n"); | |
2899 | ||
2900 | for (i = 0; i < genpd->state_count; i++) { | |
2901 | ktime_t delta = 0; | |
2902 | s64 msecs; | |
2903 | ||
2904 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2905 | (genpd->state_idx == i)) | |
2906 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2907 | ||
2908 | msecs = ktime_to_ms( | |
2909 | ktime_add(genpd->states[i].idle_time, delta)); | |
2910 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2911 | } | |
2912 | ||
2913 | genpd_unlock(genpd); | |
2914 | return ret; | |
2915 | } | |
2916 | ||
d32dcc6c | 2917 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2918 | { |
2919 | struct generic_pm_domain *genpd = s->private; | |
2920 | ktime_t delta = 0; | |
2921 | int ret = 0; | |
2922 | ||
2923 | ret = genpd_lock_interruptible(genpd); | |
2924 | if (ret) | |
2925 | return -ERESTARTSYS; | |
2926 | ||
2927 | if (genpd->status == GPD_STATE_ACTIVE) | |
2928 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2929 | ||
2930 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2931 | ktime_add(genpd->on_time, delta))); | |
2932 | ||
2933 | genpd_unlock(genpd); | |
2934 | return ret; | |
2935 | } | |
2936 | ||
d32dcc6c | 2937 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2938 | { |
2939 | struct generic_pm_domain *genpd = s->private; | |
2940 | ktime_t delta = 0, total = 0; | |
2941 | unsigned int i; | |
2942 | int ret = 0; | |
2943 | ||
2944 | ret = genpd_lock_interruptible(genpd); | |
2945 | if (ret) | |
2946 | return -ERESTARTSYS; | |
2947 | ||
2948 | for (i = 0; i < genpd->state_count; i++) { | |
2949 | ||
2950 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2951 | (genpd->state_idx == i)) | |
2952 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2953 | ||
2954 | total = ktime_add(total, genpd->states[i].idle_time); | |
2955 | } | |
2956 | total = ktime_add(total, delta); | |
2957 | ||
2958 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2959 | ||
2960 | genpd_unlock(genpd); | |
2961 | return ret; | |
2962 | } | |
2963 | ||
2964 | ||
d32dcc6c | 2965 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2966 | { |
2967 | struct generic_pm_domain *genpd = s->private; | |
2968 | struct pm_domain_data *pm_data; | |
2969 | const char *kobj_path; | |
2970 | int ret = 0; | |
2971 | ||
2972 | ret = genpd_lock_interruptible(genpd); | |
2973 | if (ret) | |
2974 | return -ERESTARTSYS; | |
2975 | ||
2976 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2977 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2978 | genpd_is_irq_safe(genpd) ? | |
2979 | GFP_ATOMIC : GFP_KERNEL); | |
2980 | if (kobj_path == NULL) | |
2981 | continue; | |
2982 | ||
2983 | seq_printf(s, "%s\n", kobj_path); | |
2984 | kfree(kobj_path); | |
2985 | } | |
2986 | ||
2987 | genpd_unlock(genpd); | |
2988 | return ret; | |
2989 | } | |
2990 | ||
d32dcc6c | 2991 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
2992 | { |
2993 | struct generic_pm_domain *genpd = s->private; | |
2994 | ||
2995 | if (genpd_lock_interruptible(genpd)) | |
2996 | return -ERESTARTSYS; | |
2997 | ||
2998 | seq_printf(s, "%u\n", genpd->performance_state); | |
2999 | ||
3000 | genpd_unlock(genpd); | |
3001 | return 0; | |
3002 | } | |
3003 | ||
d32dcc6c YL |
3004 | DEFINE_SHOW_ATTRIBUTE(summary); |
3005 | DEFINE_SHOW_ATTRIBUTE(status); | |
3006 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3007 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3008 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3009 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3010 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3011 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3012 | |
9e9704ea | 3013 | static int __init genpd_debug_init(void) |
2bd5306a MM |
3014 | { |
3015 | struct dentry *d; | |
b6a1d093 | 3016 | struct generic_pm_domain *genpd; |
2bd5306a | 3017 | |
9e9704ea | 3018 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3019 | |
e16a42c3 GKH |
3020 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3021 | NULL, &summary_fops); | |
2bd5306a | 3022 | |
b6a1d093 | 3023 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3024 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
3025 | |
3026 | debugfs_create_file("current_state", 0444, | |
d32dcc6c | 3027 | d, genpd, &status_fops); |
b6a1d093 | 3028 | debugfs_create_file("sub_domains", 0444, |
d32dcc6c | 3029 | d, genpd, &sub_domains_fops); |
b6a1d093 | 3030 | debugfs_create_file("idle_states", 0444, |
d32dcc6c | 3031 | d, genpd, &idle_states_fops); |
b6a1d093 | 3032 | debugfs_create_file("active_time", 0444, |
d32dcc6c | 3033 | d, genpd, &active_time_fops); |
b6a1d093 | 3034 | debugfs_create_file("total_idle_time", 0444, |
d32dcc6c | 3035 | d, genpd, &total_idle_time_fops); |
b6a1d093 | 3036 | debugfs_create_file("devices", 0444, |
d32dcc6c | 3037 | d, genpd, &devices_fops); |
e8912812 RN |
3038 | if (genpd->set_performance_state) |
3039 | debugfs_create_file("perf_state", 0444, | |
d32dcc6c | 3040 | d, genpd, &perf_state_fops); |
b6a1d093 TG |
3041 | } |
3042 | ||
2bd5306a MM |
3043 | return 0; |
3044 | } | |
9e9704ea | 3045 | late_initcall(genpd_debug_init); |
2bd5306a | 3046 | |
9e9704ea | 3047 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3048 | { |
9e9704ea | 3049 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3050 | } |
9e9704ea | 3051 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3052 | #endif /* CONFIG_DEBUG_FS */ |