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5de363b6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f721889f RW |
2 | /* |
3 | * drivers/base/power/domain.c - Common code related to device power domains. | |
4 | * | |
5 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
f721889f | 6 | */ |
7a5bd127 JP |
7 | #define pr_fmt(fmt) "PM: " fmt |
8 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
6a0ae73d | 13 | #include <linux/pm_opp.h> |
f721889f RW |
14 | #include <linux/pm_runtime.h> |
15 | #include <linux/pm_domain.h> | |
6ff7bb0d | 16 | #include <linux/pm_qos.h> |
c11f6f5b | 17 | #include <linux/pm_clock.h> |
f721889f RW |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> | |
17b75eca RW |
20 | #include <linux/sched.h> |
21 | #include <linux/suspend.h> | |
d5e4cbfe | 22 | #include <linux/export.h> |
eb594b73 | 23 | #include <linux/cpu.h> |
d5e4cbfe | 24 | |
aa8e54b5 TV |
25 | #include "power.h" |
26 | ||
93af5e93 GU |
27 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
28 | ||
d5e4cbfe RW |
29 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
30 | ({ \ | |
31 | type (*__routine)(struct device *__d); \ | |
32 | type __ret = (type)0; \ | |
33 | \ | |
34 | __routine = genpd->dev_ops.callback; \ | |
35 | if (__routine) { \ | |
36 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
37 | } \ |
38 | __ret; \ | |
39 | }) | |
f721889f | 40 | |
5125bbf3 RW |
41 | static LIST_HEAD(gpd_list); |
42 | static DEFINE_MUTEX(gpd_list_lock); | |
43 | ||
35241d12 LI |
44 | struct genpd_lock_ops { |
45 | void (*lock)(struct generic_pm_domain *genpd); | |
46 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
47 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
48 | void (*unlock)(struct generic_pm_domain *genpd); | |
49 | }; | |
50 | ||
51 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
52 | { | |
53 | mutex_lock(&genpd->mlock); | |
54 | } | |
55 | ||
56 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
57 | int depth) | |
58 | { | |
59 | mutex_lock_nested(&genpd->mlock, depth); | |
60 | } | |
61 | ||
62 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
63 | { | |
64 | return mutex_lock_interruptible(&genpd->mlock); | |
65 | } | |
66 | ||
67 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
68 | { | |
69 | return mutex_unlock(&genpd->mlock); | |
70 | } | |
71 | ||
72 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
73 | .lock = genpd_lock_mtx, | |
74 | .lock_nested = genpd_lock_nested_mtx, | |
75 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
76 | .unlock = genpd_unlock_mtx, | |
77 | }; | |
78 | ||
d716f479 LI |
79 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
80 | __acquires(&genpd->slock) | |
81 | { | |
82 | unsigned long flags; | |
83 | ||
84 | spin_lock_irqsave(&genpd->slock, flags); | |
85 | genpd->lock_flags = flags; | |
86 | } | |
87 | ||
88 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
89 | int depth) | |
90 | __acquires(&genpd->slock) | |
91 | { | |
92 | unsigned long flags; | |
93 | ||
94 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
95 | genpd->lock_flags = flags; | |
96 | } | |
97 | ||
98 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
99 | __acquires(&genpd->slock) | |
100 | { | |
101 | unsigned long flags; | |
102 | ||
103 | spin_lock_irqsave(&genpd->slock, flags); | |
104 | genpd->lock_flags = flags; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
109 | __releases(&genpd->slock) | |
110 | { | |
111 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
112 | } | |
113 | ||
114 | static const struct genpd_lock_ops genpd_spin_ops = { | |
115 | .lock = genpd_lock_spin, | |
116 | .lock_nested = genpd_lock_nested_spin, | |
117 | .lock_interruptible = genpd_lock_interruptible_spin, | |
118 | .unlock = genpd_unlock_spin, | |
119 | }; | |
120 | ||
35241d12 LI |
121 | #define genpd_lock(p) p->lock_ops->lock(p) |
122 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
123 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
124 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
125 | ||
41e2c8e0 | 126 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 127 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 128 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 129 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
eb594b73 | 130 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
ed61e18a | 131 | #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
d716f479 LI |
132 | |
133 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 134 | const struct generic_pm_domain *genpd) |
d716f479 LI |
135 | { |
136 | bool ret; | |
137 | ||
138 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
139 | ||
075c37d5 UH |
140 | /* |
141 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
142 | * to indicate a suboptimal configuration for PM. For an always on | |
143 | * domain this isn't case, thus don't warn. | |
144 | */ | |
145 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
146 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
147 | genpd->name); | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
446d999c RK |
152 | /* |
153 | * Get the generic PM domain for a particular struct device. | |
154 | * This validates the struct device pointer, the PM domain pointer, | |
155 | * and checks that the PM domain pointer is a real generic PM domain. | |
156 | * Any failure results in NULL being returned. | |
157 | */ | |
f58d4e5a | 158 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
159 | { |
160 | struct generic_pm_domain *genpd = NULL, *gpd; | |
161 | ||
162 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
163 | return NULL; | |
164 | ||
165 | mutex_lock(&gpd_list_lock); | |
166 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
167 | if (&gpd->domain == dev->pm_domain) { | |
168 | genpd = gpd; | |
169 | break; | |
170 | } | |
171 | } | |
172 | mutex_unlock(&gpd_list_lock); | |
173 | ||
174 | return genpd; | |
175 | } | |
176 | ||
177 | /* | |
178 | * This should only be used where we are certain that the pm_domain | |
179 | * attached to the device is a genpd domain. | |
180 | */ | |
181 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
182 | { |
183 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
184 | return ERR_PTR(-EINVAL); | |
185 | ||
596ba34b | 186 | return pd_to_genpd(dev->pm_domain); |
5248051b | 187 | } |
f721889f | 188 | |
d8600c8b KK |
189 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
190 | struct device *dev) | |
d5e4cbfe | 191 | { |
2b1d88cd | 192 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
193 | } |
194 | ||
d8600c8b KK |
195 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
196 | struct device *dev) | |
d5e4cbfe | 197 | { |
2b1d88cd | 198 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
199 | } |
200 | ||
c4bb3160 | 201 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 202 | { |
c4bb3160 RW |
203 | bool ret = false; |
204 | ||
205 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
206 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
207 | ||
208 | return ret; | |
209 | } | |
210 | ||
211 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
212 | { | |
213 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 214 | smp_mb__after_atomic(); |
f721889f RW |
215 | } |
216 | ||
afece3ab TG |
217 | #ifdef CONFIG_DEBUG_FS |
218 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
219 | { | |
220 | ktime_t delta, now; | |
221 | ||
222 | now = ktime_get(); | |
223 | delta = ktime_sub(now, genpd->accounting_time); | |
224 | ||
225 | /* | |
226 | * If genpd->status is active, it means we are just | |
227 | * out of off and so update the idle time and vice | |
228 | * versa. | |
229 | */ | |
230 | if (genpd->status == GPD_STATE_ACTIVE) { | |
231 | int state_idx = genpd->state_idx; | |
232 | ||
233 | genpd->states[state_idx].idle_time = | |
234 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
235 | } else { | |
236 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
237 | } | |
238 | ||
239 | genpd->accounting_time = now; | |
240 | } | |
241 | #else | |
242 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
243 | #endif | |
244 | ||
cd50c6d3 VK |
245 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
246 | unsigned int state) | |
247 | { | |
248 | struct generic_pm_domain_data *pd_data; | |
249 | struct pm_domain_data *pdd; | |
18edf49c | 250 | struct gpd_link *link; |
cd50c6d3 VK |
251 | |
252 | /* New requested state is same as Max requested state */ | |
253 | if (state == genpd->performance_state) | |
254 | return state; | |
255 | ||
256 | /* New requested state is higher than Max requested state */ | |
257 | if (state > genpd->performance_state) | |
258 | return state; | |
259 | ||
260 | /* Traverse all devices within the domain */ | |
261 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
262 | pd_data = to_gpd_data(pdd); | |
263 | ||
264 | if (pd_data->performance_state > state) | |
265 | state = pd_data->performance_state; | |
266 | } | |
267 | ||
268 | /* | |
18edf49c VK |
269 | * Traverse all sub-domains within the domain. This can be |
270 | * done without any additional locking as the link->performance_state | |
271 | * field is protected by the master genpd->lock, which is already taken. | |
272 | * | |
273 | * Also note that link->performance_state (subdomain's performance state | |
274 | * requirement to master domain) is different from | |
275 | * link->slave->performance_state (current performance state requirement | |
276 | * of the devices/sub-domains of the subdomain) and so can have a | |
277 | * different value. | |
278 | * | |
279 | * Note that we also take vote from powered-off sub-domains into account | |
280 | * as the same is done for devices right now. | |
cd50c6d3 | 281 | */ |
18edf49c VK |
282 | list_for_each_entry(link, &genpd->master_links, master_node) { |
283 | if (link->performance_state > state) | |
284 | state = link->performance_state; | |
285 | } | |
286 | ||
cd50c6d3 VK |
287 | return state; |
288 | } | |
289 | ||
290 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, | |
18edf49c | 291 | unsigned int state, int depth) |
cd50c6d3 | 292 | { |
18edf49c VK |
293 | struct generic_pm_domain *master; |
294 | struct gpd_link *link; | |
295 | int master_state, ret; | |
cd50c6d3 VK |
296 | |
297 | if (state == genpd->performance_state) | |
298 | return 0; | |
299 | ||
18edf49c VK |
300 | /* Propagate to masters of genpd */ |
301 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
302 | master = link->master; | |
303 | ||
304 | if (!master->set_performance_state) | |
305 | continue; | |
306 | ||
307 | /* Find master's performance state */ | |
308 | ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
309 | master->opp_table, | |
310 | state); | |
311 | if (unlikely(ret < 0)) | |
312 | goto err; | |
313 | ||
314 | master_state = ret; | |
315 | ||
316 | genpd_lock_nested(master, depth + 1); | |
317 | ||
318 | link->prev_performance_state = link->performance_state; | |
319 | link->performance_state = master_state; | |
320 | master_state = _genpd_reeval_performance_state(master, | |
321 | master_state); | |
322 | ret = _genpd_set_performance_state(master, master_state, depth + 1); | |
323 | if (ret) | |
324 | link->performance_state = link->prev_performance_state; | |
325 | ||
326 | genpd_unlock(master); | |
327 | ||
328 | if (ret) | |
329 | goto err; | |
330 | } | |
331 | ||
cd50c6d3 VK |
332 | ret = genpd->set_performance_state(genpd, state); |
333 | if (ret) | |
18edf49c | 334 | goto err; |
cd50c6d3 VK |
335 | |
336 | genpd->performance_state = state; | |
337 | return 0; | |
18edf49c VK |
338 | |
339 | err: | |
340 | /* Encountered an error, lets rollback */ | |
341 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, | |
342 | slave_node) { | |
343 | master = link->master; | |
344 | ||
345 | if (!master->set_performance_state) | |
346 | continue; | |
347 | ||
348 | genpd_lock_nested(master, depth + 1); | |
349 | ||
350 | master_state = link->prev_performance_state; | |
351 | link->performance_state = master_state; | |
352 | ||
353 | master_state = _genpd_reeval_performance_state(master, | |
354 | master_state); | |
355 | if (_genpd_set_performance_state(master, master_state, depth + 1)) { | |
356 | pr_err("%s: Failed to roll back to %d performance state\n", | |
357 | master->name, master_state); | |
358 | } | |
359 | ||
360 | genpd_unlock(master); | |
361 | } | |
362 | ||
363 | return ret; | |
cd50c6d3 VK |
364 | } |
365 | ||
42f6284a VK |
366 | /** |
367 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
368 | * domain. | |
369 | * | |
370 | * @dev: Device for which the performance-state needs to be set. | |
371 | * @state: Target performance state of the device. This can be set as 0 when the | |
372 | * device doesn't have any performance state constraints left (And so | |
373 | * the device wouldn't participate anymore to find the target | |
374 | * performance state of the genpd). | |
375 | * | |
376 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
377 | * while this routine is getting called. | |
378 | * | |
379 | * Returns 0 on success and negative error values on failures. | |
380 | */ | |
381 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
382 | { | |
383 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 384 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 385 | unsigned int prev; |
cd50c6d3 | 386 | int ret; |
42f6284a VK |
387 | |
388 | genpd = dev_to_genpd(dev); | |
389 | if (IS_ERR(genpd)) | |
390 | return -ENODEV; | |
391 | ||
392 | if (unlikely(!genpd->set_performance_state)) | |
393 | return -EINVAL; | |
394 | ||
e757e7fa YL |
395 | if (WARN_ON(!dev->power.subsys_data || |
396 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 397 | return -EINVAL; |
42f6284a VK |
398 | |
399 | genpd_lock(genpd); | |
400 | ||
401 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
402 | prev = gpd_data->performance_state; | |
403 | gpd_data->performance_state = state; | |
404 | ||
cd50c6d3 | 405 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 406 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 407 | if (ret) |
68de2fe5 | 408 | gpd_data->performance_state = prev; |
42f6284a | 409 | |
42f6284a VK |
410 | genpd_unlock(genpd); |
411 | ||
412 | return ret; | |
413 | } | |
414 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
415 | ||
86e12eac | 416 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 417 | { |
fc5cbf0c | 418 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
419 | ktime_t time_start; |
420 | s64 elapsed_ns; | |
421 | int ret; | |
422 | ||
423 | if (!genpd->power_on) | |
424 | return 0; | |
425 | ||
a4630c61 GU |
426 | if (!timed) |
427 | return genpd->power_on(genpd); | |
428 | ||
c8f0ea45 GU |
429 | time_start = ktime_get(); |
430 | ret = genpd->power_on(genpd); | |
431 | if (ret) | |
432 | return ret; | |
433 | ||
434 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 435 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
436 | return ret; |
437 | ||
fc5cbf0c | 438 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 439 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
440 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
441 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
442 | |
443 | return ret; | |
444 | } | |
445 | ||
86e12eac | 446 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 447 | { |
fc5cbf0c | 448 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
449 | ktime_t time_start; |
450 | s64 elapsed_ns; | |
451 | int ret; | |
452 | ||
453 | if (!genpd->power_off) | |
454 | return 0; | |
455 | ||
a4630c61 GU |
456 | if (!timed) |
457 | return genpd->power_off(genpd); | |
458 | ||
c8f0ea45 GU |
459 | time_start = ktime_get(); |
460 | ret = genpd->power_off(genpd); | |
0cec68a9 | 461 | if (ret) |
c8f0ea45 GU |
462 | return ret; |
463 | ||
464 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 465 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
0cec68a9 | 466 | return 0; |
c8f0ea45 | 467 | |
fc5cbf0c | 468 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 469 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
470 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
471 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 472 | |
0cec68a9 | 473 | return 0; |
c8f0ea45 GU |
474 | } |
475 | ||
29e47e21 | 476 | /** |
86e12eac | 477 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 478 | * @genpd: PM domain to power off. |
29e47e21 | 479 | * |
86e12eac | 480 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
481 | * before. |
482 | */ | |
483 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
484 | { | |
485 | queue_work(pm_wq, &genpd->power_off_work); | |
486 | } | |
487 | ||
1f8728b7 UH |
488 | /** |
489 | * genpd_power_off - Remove power from a given PM domain. | |
490 | * @genpd: PM domain to power down. | |
3c64649d UH |
491 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
492 | * RPM status of the releated device is in an intermediate state, not yet turned | |
493 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
494 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
495 | * |
496 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
497 | * have been powered down, remove power from @genpd. | |
498 | */ | |
2da83545 UH |
499 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
500 | unsigned int depth) | |
1f8728b7 UH |
501 | { |
502 | struct pm_domain_data *pdd; | |
503 | struct gpd_link *link; | |
504 | unsigned int not_suspended = 0; | |
505 | ||
506 | /* | |
507 | * Do not try to power off the domain in the following situations: | |
508 | * (1) The domain is already in the "power off" state. | |
509 | * (2) System suspend is in progress. | |
510 | */ | |
41e2c8e0 | 511 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
512 | return 0; |
513 | ||
ffaa42e8 UH |
514 | /* |
515 | * Abort power off for the PM domain in the following situations: | |
516 | * (1) The domain is configured as always on. | |
517 | * (2) When the domain has a subdomain being powered on. | |
518 | */ | |
ed61e18a LC |
519 | if (genpd_is_always_on(genpd) || |
520 | genpd_is_rpm_always_on(genpd) || | |
521 | atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
522 | return -EBUSY; |
523 | ||
524 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
525 | enum pm_qos_flags_status stat; | |
526 | ||
20f97caf | 527 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
528 | if (stat > PM_QOS_FLAGS_NONE) |
529 | return -EBUSY; | |
530 | ||
531 | /* | |
532 | * Do not allow PM domain to be powered off, when an IRQ safe | |
533 | * device is part of a non-IRQ safe domain. | |
534 | */ | |
535 | if (!pm_runtime_suspended(pdd->dev) || | |
536 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
537 | not_suspended++; | |
538 | } | |
539 | ||
3c64649d | 540 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
541 | return -EBUSY; |
542 | ||
543 | if (genpd->gov && genpd->gov->power_down_ok) { | |
544 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
545 | return -EAGAIN; | |
546 | } | |
547 | ||
2c9b7f87 UH |
548 | /* Default to shallowest state. */ |
549 | if (!genpd->gov) | |
550 | genpd->state_idx = 0; | |
551 | ||
1f8728b7 UH |
552 | if (genpd->power_off) { |
553 | int ret; | |
554 | ||
555 | if (atomic_read(&genpd->sd_count) > 0) | |
556 | return -EBUSY; | |
557 | ||
558 | /* | |
559 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
560 | * managed to call genpd_power_on() for the master yet after | |
561 | * incrementing it. In that case genpd_power_on() will wait | |
562 | * for us to drop the lock, so we can call .power_off() and let | |
563 | * the genpd_power_on() restore power for us (this shouldn't | |
564 | * happen very often). | |
565 | */ | |
566 | ret = _genpd_power_off(genpd, true); | |
567 | if (ret) | |
568 | return ret; | |
569 | } | |
570 | ||
571 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 572 | genpd_update_accounting(genpd); |
1f8728b7 UH |
573 | |
574 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
575 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
576 | genpd_lock_nested(link->master, depth + 1); |
577 | genpd_power_off(link->master, false, depth + 1); | |
578 | genpd_unlock(link->master); | |
1f8728b7 UH |
579 | } |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
5248051b | 584 | /** |
86e12eac | 585 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 586 | * @genpd: PM domain to power up. |
0106ef51 | 587 | * @depth: nesting count for lockdep. |
5248051b | 588 | * |
5063ce15 | 589 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
590 | * resume a device belonging to it. |
591 | */ | |
86e12eac | 592 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 593 | { |
5063ce15 | 594 | struct gpd_link *link; |
5248051b RW |
595 | int ret = 0; |
596 | ||
41e2c8e0 | 597 | if (genpd_status_on(genpd)) |
3f241775 | 598 | return 0; |
5248051b | 599 | |
5063ce15 RW |
600 | /* |
601 | * The list is guaranteed not to change while the loop below is being | |
602 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
603 | * with it. | |
604 | */ | |
605 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
606 | struct generic_pm_domain *master = link->master; |
607 | ||
608 | genpd_sd_counter_inc(master); | |
609 | ||
35241d12 | 610 | genpd_lock_nested(master, depth + 1); |
86e12eac | 611 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 612 | genpd_unlock(master); |
5248051b | 613 | |
5063ce15 | 614 | if (ret) { |
0106ef51 | 615 | genpd_sd_counter_dec(master); |
9e08cf42 | 616 | goto err; |
5063ce15 | 617 | } |
5248051b RW |
618 | } |
619 | ||
86e12eac | 620 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
621 | if (ret) |
622 | goto err; | |
5248051b | 623 | |
ba2bbfbf | 624 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
625 | genpd_update_accounting(genpd); |
626 | ||
3f241775 | 627 | return 0; |
9e08cf42 RW |
628 | |
629 | err: | |
29e47e21 UH |
630 | list_for_each_entry_continue_reverse(link, |
631 | &genpd->slave_links, | |
632 | slave_node) { | |
5063ce15 | 633 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
634 | genpd_lock_nested(link->master, depth + 1); |
635 | genpd_power_off(link->master, false, depth + 1); | |
636 | genpd_unlock(link->master); | |
29e47e21 | 637 | } |
9e08cf42 | 638 | |
3f241775 RW |
639 | return ret; |
640 | } | |
641 | ||
6ff7bb0d RW |
642 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
643 | unsigned long val, void *ptr) | |
644 | { | |
645 | struct generic_pm_domain_data *gpd_data; | |
646 | struct device *dev; | |
647 | ||
648 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 649 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
650 | |
651 | for (;;) { | |
652 | struct generic_pm_domain *genpd; | |
653 | struct pm_domain_data *pdd; | |
654 | ||
655 | spin_lock_irq(&dev->power.lock); | |
656 | ||
657 | pdd = dev->power.subsys_data ? | |
658 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 659 | if (pdd) { |
6ff7bb0d RW |
660 | to_gpd_data(pdd)->td.constraint_changed = true; |
661 | genpd = dev_to_genpd(dev); | |
662 | } else { | |
663 | genpd = ERR_PTR(-ENODATA); | |
664 | } | |
665 | ||
666 | spin_unlock_irq(&dev->power.lock); | |
667 | ||
668 | if (!IS_ERR(genpd)) { | |
35241d12 | 669 | genpd_lock(genpd); |
6ff7bb0d | 670 | genpd->max_off_time_changed = true; |
35241d12 | 671 | genpd_unlock(genpd); |
6ff7bb0d RW |
672 | } |
673 | ||
674 | dev = dev->parent; | |
675 | if (!dev || dev->power.ignore_children) | |
676 | break; | |
677 | } | |
678 | ||
679 | return NOTIFY_DONE; | |
680 | } | |
681 | ||
f721889f RW |
682 | /** |
683 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
684 | * @work: Work structure used for scheduling the execution of this function. | |
685 | */ | |
686 | static void genpd_power_off_work_fn(struct work_struct *work) | |
687 | { | |
688 | struct generic_pm_domain *genpd; | |
689 | ||
690 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
691 | ||
35241d12 | 692 | genpd_lock(genpd); |
2da83545 | 693 | genpd_power_off(genpd, false, 0); |
35241d12 | 694 | genpd_unlock(genpd); |
f721889f RW |
695 | } |
696 | ||
54eeddbf UH |
697 | /** |
698 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
699 | * @dev: Device to handle. | |
700 | */ | |
701 | static int __genpd_runtime_suspend(struct device *dev) | |
702 | { | |
703 | int (*cb)(struct device *__dev); | |
704 | ||
705 | if (dev->type && dev->type->pm) | |
706 | cb = dev->type->pm->runtime_suspend; | |
707 | else if (dev->class && dev->class->pm) | |
708 | cb = dev->class->pm->runtime_suspend; | |
709 | else if (dev->bus && dev->bus->pm) | |
710 | cb = dev->bus->pm->runtime_suspend; | |
711 | else | |
712 | cb = NULL; | |
713 | ||
714 | if (!cb && dev->driver && dev->driver->pm) | |
715 | cb = dev->driver->pm->runtime_suspend; | |
716 | ||
717 | return cb ? cb(dev) : 0; | |
718 | } | |
719 | ||
720 | /** | |
721 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
722 | * @dev: Device to handle. | |
723 | */ | |
724 | static int __genpd_runtime_resume(struct device *dev) | |
725 | { | |
726 | int (*cb)(struct device *__dev); | |
727 | ||
728 | if (dev->type && dev->type->pm) | |
729 | cb = dev->type->pm->runtime_resume; | |
730 | else if (dev->class && dev->class->pm) | |
731 | cb = dev->class->pm->runtime_resume; | |
732 | else if (dev->bus && dev->bus->pm) | |
733 | cb = dev->bus->pm->runtime_resume; | |
734 | else | |
735 | cb = NULL; | |
736 | ||
737 | if (!cb && dev->driver && dev->driver->pm) | |
738 | cb = dev->driver->pm->runtime_resume; | |
739 | ||
740 | return cb ? cb(dev) : 0; | |
741 | } | |
742 | ||
f721889f | 743 | /** |
795bd2e7 | 744 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
745 | * @dev: Device to suspend. |
746 | * | |
747 | * Carry out a runtime suspend of a device under the assumption that its | |
748 | * pm_domain field points to the domain member of an object of type | |
749 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
750 | */ | |
795bd2e7 | 751 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
752 | { |
753 | struct generic_pm_domain *genpd; | |
9df3921e | 754 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 755 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 756 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
757 | ktime_t time_start; |
758 | s64 elapsed_ns; | |
d5e4cbfe | 759 | int ret; |
f721889f RW |
760 | |
761 | dev_dbg(dev, "%s()\n", __func__); | |
762 | ||
5248051b RW |
763 | genpd = dev_to_genpd(dev); |
764 | if (IS_ERR(genpd)) | |
f721889f RW |
765 | return -EINVAL; |
766 | ||
ffe12855 UH |
767 | /* |
768 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
769 | * callbacks for other purposes than runtime PM. In those scenarios | |
770 | * runtime PM is disabled. Under these circumstances, we shall skip | |
771 | * validating/measuring the PM QoS latency. | |
772 | */ | |
9df3921e UH |
773 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
774 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
775 | return -EBUSY; |
776 | ||
2b1d88cd | 777 | /* Measure suspend latency. */ |
d33d5a6c | 778 | time_start = 0; |
ffe12855 UH |
779 | if (runtime_pm) |
780 | time_start = ktime_get(); | |
2b1d88cd | 781 | |
54eeddbf | 782 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
783 | if (ret) |
784 | return ret; | |
17b75eca | 785 | |
2b1d88cd | 786 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 787 | if (ret) { |
54eeddbf | 788 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
789 | return ret; |
790 | } | |
791 | ||
2b1d88cd | 792 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
793 | if (runtime_pm) { |
794 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
795 | if (elapsed_ns > td->suspend_latency_ns) { | |
796 | td->suspend_latency_ns = elapsed_ns; | |
797 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
798 | elapsed_ns); | |
799 | genpd->max_off_time_changed = true; | |
800 | td->constraint_changed = true; | |
801 | } | |
2b1d88cd UH |
802 | } |
803 | ||
0aa2a221 | 804 | /* |
d716f479 LI |
805 | * If power.irq_safe is set, this routine may be run with |
806 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 807 | */ |
d716f479 | 808 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
809 | return 0; |
810 | ||
35241d12 | 811 | genpd_lock(genpd); |
2da83545 | 812 | genpd_power_off(genpd, true, 0); |
35241d12 | 813 | genpd_unlock(genpd); |
f721889f RW |
814 | |
815 | return 0; | |
816 | } | |
817 | ||
f721889f | 818 | /** |
795bd2e7 | 819 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
820 | * @dev: Device to resume. |
821 | * | |
822 | * Carry out a runtime resume of a device under the assumption that its | |
823 | * pm_domain field points to the domain member of an object of type | |
824 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
825 | */ | |
795bd2e7 | 826 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
827 | { |
828 | struct generic_pm_domain *genpd; | |
2b1d88cd | 829 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 830 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
831 | ktime_t time_start; |
832 | s64 elapsed_ns; | |
f721889f | 833 | int ret; |
ba2bbfbf | 834 | bool timed = true; |
f721889f RW |
835 | |
836 | dev_dbg(dev, "%s()\n", __func__); | |
837 | ||
5248051b RW |
838 | genpd = dev_to_genpd(dev); |
839 | if (IS_ERR(genpd)) | |
f721889f RW |
840 | return -EINVAL; |
841 | ||
d716f479 LI |
842 | /* |
843 | * As we don't power off a non IRQ safe domain, which holds | |
844 | * an IRQ safe device, we don't need to restore power to it. | |
845 | */ | |
846 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
847 | timed = false; |
848 | goto out; | |
849 | } | |
0aa2a221 | 850 | |
35241d12 | 851 | genpd_lock(genpd); |
86e12eac | 852 | ret = genpd_power_on(genpd, 0); |
35241d12 | 853 | genpd_unlock(genpd); |
c6d22b37 | 854 | |
ba2bbfbf UH |
855 | if (ret) |
856 | return ret; | |
c6d22b37 | 857 | |
ba2bbfbf | 858 | out: |
2b1d88cd | 859 | /* Measure resume latency. */ |
ab51e6ba | 860 | time_start = 0; |
ffe12855 | 861 | if (timed && runtime_pm) |
2b1d88cd UH |
862 | time_start = ktime_get(); |
863 | ||
076395ca LP |
864 | ret = genpd_start_dev(genpd, dev); |
865 | if (ret) | |
866 | goto err_poweroff; | |
867 | ||
54eeddbf | 868 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
869 | if (ret) |
870 | goto err_stop; | |
2b1d88cd UH |
871 | |
872 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 873 | if (timed && runtime_pm) { |
2b1d88cd UH |
874 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
875 | if (elapsed_ns > td->resume_latency_ns) { | |
876 | td->resume_latency_ns = elapsed_ns; | |
877 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
878 | elapsed_ns); | |
879 | genpd->max_off_time_changed = true; | |
880 | td->constraint_changed = true; | |
881 | } | |
882 | } | |
17b75eca | 883 | |
f721889f | 884 | return 0; |
076395ca LP |
885 | |
886 | err_stop: | |
887 | genpd_stop_dev(genpd, dev); | |
888 | err_poweroff: | |
d716f479 LI |
889 | if (!pm_runtime_is_irq_safe(dev) || |
890 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 891 | genpd_lock(genpd); |
2da83545 | 892 | genpd_power_off(genpd, true, 0); |
35241d12 | 893 | genpd_unlock(genpd); |
076395ca LP |
894 | } |
895 | ||
896 | return ret; | |
f721889f RW |
897 | } |
898 | ||
39ac5ba5 TB |
899 | static bool pd_ignore_unused; |
900 | static int __init pd_ignore_unused_setup(char *__unused) | |
901 | { | |
902 | pd_ignore_unused = true; | |
903 | return 1; | |
904 | } | |
905 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
906 | ||
17f2ae7f | 907 | /** |
86e12eac | 908 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 909 | */ |
86e12eac | 910 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
911 | { |
912 | struct generic_pm_domain *genpd; | |
913 | ||
39ac5ba5 TB |
914 | if (pd_ignore_unused) { |
915 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 916 | return 0; |
39ac5ba5 TB |
917 | } |
918 | ||
17f2ae7f RW |
919 | mutex_lock(&gpd_list_lock); |
920 | ||
921 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
922 | genpd_queue_power_off_work(genpd); | |
923 | ||
924 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 925 | |
2fe71dcd UH |
926 | return 0; |
927 | } | |
86e12eac | 928 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 929 | |
0159ec67 | 930 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 931 | |
9e9704ea | 932 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 933 | { |
895b31f3 | 934 | const struct generic_pm_domain *gpd; |
77f827de RW |
935 | |
936 | if (IS_ERR_OR_NULL(genpd)) | |
937 | return false; | |
938 | ||
939 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
940 | if (gpd == genpd) | |
941 | return true; | |
942 | ||
943 | return false; | |
944 | } | |
945 | ||
0159ec67 JH |
946 | #endif |
947 | ||
948 | #ifdef CONFIG_PM_SLEEP | |
949 | ||
596ba34b | 950 | /** |
86e12eac | 951 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 952 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
953 | * @use_lock: use the lock. |
954 | * @depth: nesting count for lockdep. | |
596ba34b RW |
955 | * |
956 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 957 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 958 | * |
77f827de | 959 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
960 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
961 | * these cases the lock must be held. | |
596ba34b | 962 | */ |
0883ac03 UH |
963 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
964 | unsigned int depth) | |
596ba34b | 965 | { |
5063ce15 | 966 | struct gpd_link *link; |
596ba34b | 967 | |
ffaa42e8 | 968 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
969 | return; |
970 | ||
c4bb3160 RW |
971 | if (genpd->suspended_count != genpd->device_count |
972 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
973 | return; |
974 | ||
fc5cbf0c AH |
975 | /* Choose the deepest state when suspending */ |
976 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
977 | if (_genpd_power_off(genpd, false)) |
978 | return; | |
596ba34b | 979 | |
17b75eca | 980 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
981 | |
982 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
983 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
984 | |
985 | if (use_lock) | |
986 | genpd_lock_nested(link->master, depth + 1); | |
987 | ||
988 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
989 | ||
990 | if (use_lock) | |
991 | genpd_unlock(link->master); | |
596ba34b RW |
992 | } |
993 | } | |
994 | ||
802d8b49 | 995 | /** |
86e12eac | 996 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 997 | * @genpd: PM domain to power on. |
0883ac03 UH |
998 | * @use_lock: use the lock. |
999 | * @depth: nesting count for lockdep. | |
802d8b49 | 1000 | * |
77f827de | 1001 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1002 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1003 | * these cases the lock must be held. | |
802d8b49 | 1004 | */ |
0883ac03 UH |
1005 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1006 | unsigned int depth) | |
802d8b49 RW |
1007 | { |
1008 | struct gpd_link *link; | |
1009 | ||
41e2c8e0 | 1010 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1011 | return; |
1012 | ||
1013 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 1014 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
1015 | |
1016 | if (use_lock) | |
1017 | genpd_lock_nested(link->master, depth + 1); | |
1018 | ||
1019 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
1020 | ||
1021 | if (use_lock) | |
1022 | genpd_unlock(link->master); | |
802d8b49 RW |
1023 | } |
1024 | ||
86e12eac | 1025 | _genpd_power_on(genpd, false); |
802d8b49 RW |
1026 | |
1027 | genpd->status = GPD_STATE_ACTIVE; | |
1028 | } | |
1029 | ||
4ecd6e65 RW |
1030 | /** |
1031 | * resume_needed - Check whether to resume a device before system suspend. | |
1032 | * @dev: Device to check. | |
1033 | * @genpd: PM domain the device belongs to. | |
1034 | * | |
1035 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1036 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1037 | * to wake up the system and it has to remain active for this purpose while the |
1038 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1039 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1040 | * by itself (those signals are generated on its behalf by other parts of the | |
1041 | * system). In the latter case it may be necessary to reconfigure the device's | |
1042 | * wakeup settings during system suspend, because it may have been set up to | |
1043 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1044 | * Return 'true' in either of the above cases. | |
1045 | */ | |
d8600c8b KK |
1046 | static bool resume_needed(struct device *dev, |
1047 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1048 | { |
1049 | bool active_wakeup; | |
1050 | ||
1051 | if (!device_can_wakeup(dev)) | |
1052 | return false; | |
1053 | ||
d0af45f1 | 1054 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1055 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1056 | } | |
1057 | ||
596ba34b | 1058 | /** |
9e9704ea | 1059 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1060 | * @dev: Device to start the transition of. |
1061 | * | |
1062 | * Start a power transition of a device (during a system-wide power transition) | |
1063 | * under the assumption that its pm_domain field points to the domain member of | |
1064 | * an object of type struct generic_pm_domain representing a PM domain | |
1065 | * consisting of I/O devices. | |
1066 | */ | |
9e9704ea | 1067 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1068 | { |
1069 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1070 | int ret; |
596ba34b RW |
1071 | |
1072 | dev_dbg(dev, "%s()\n", __func__); | |
1073 | ||
1074 | genpd = dev_to_genpd(dev); | |
1075 | if (IS_ERR(genpd)) | |
1076 | return -EINVAL; | |
1077 | ||
17b75eca RW |
1078 | /* |
1079 | * If a wakeup request is pending for the device, it should be woken up | |
1080 | * at this point and a system wakeup event should be reported if it's | |
1081 | * set up to wake up the system from sleep states. | |
1082 | */ | |
4ecd6e65 RW |
1083 | if (resume_needed(dev, genpd)) |
1084 | pm_runtime_resume(dev); | |
1085 | ||
35241d12 | 1086 | genpd_lock(genpd); |
596ba34b | 1087 | |
39dd0f23 | 1088 | if (genpd->prepared_count++ == 0) |
65533bbf | 1089 | genpd->suspended_count = 0; |
17b75eca | 1090 | |
35241d12 | 1091 | genpd_unlock(genpd); |
596ba34b | 1092 | |
b6c10c84 | 1093 | ret = pm_generic_prepare(dev); |
5241ab40 | 1094 | if (ret < 0) { |
35241d12 | 1095 | genpd_lock(genpd); |
b6c10c84 | 1096 | |
39dd0f23 | 1097 | genpd->prepared_count--; |
b6c10c84 | 1098 | |
35241d12 | 1099 | genpd_unlock(genpd); |
b6c10c84 | 1100 | } |
17b75eca | 1101 | |
5241ab40 UH |
1102 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1103 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1104 | } |
1105 | ||
0496c8ae | 1106 | /** |
10da6542 MP |
1107 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1108 | * I/O pm domain. | |
0496c8ae | 1109 | * @dev: Device to suspend. |
10da6542 | 1110 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1111 | * |
1112 | * Stop the device and remove power from the domain if all devices in it have | |
1113 | * been stopped. | |
1114 | */ | |
10da6542 | 1115 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1116 | { |
1117 | struct generic_pm_domain *genpd; | |
a935424b | 1118 | int ret = 0; |
0496c8ae | 1119 | |
0496c8ae RW |
1120 | genpd = dev_to_genpd(dev); |
1121 | if (IS_ERR(genpd)) | |
1122 | return -EINVAL; | |
596ba34b | 1123 | |
10da6542 MP |
1124 | if (poweroff) |
1125 | ret = pm_generic_poweroff_noirq(dev); | |
1126 | else | |
1127 | ret = pm_generic_suspend_noirq(dev); | |
1128 | if (ret) | |
1129 | return ret; | |
1130 | ||
a935424b UH |
1131 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1132 | return 0; | |
1133 | ||
17218e00 RW |
1134 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1135 | !pm_runtime_status_suspended(dev)) { | |
1136 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1137 | if (ret) { |
1138 | if (poweroff) | |
1139 | pm_generic_restore_noirq(dev); | |
1140 | else | |
1141 | pm_generic_resume_noirq(dev); | |
122a2237 | 1142 | return ret; |
a935424b | 1143 | } |
122a2237 UH |
1144 | } |
1145 | ||
0883ac03 | 1146 | genpd_lock(genpd); |
596ba34b | 1147 | genpd->suspended_count++; |
0883ac03 UH |
1148 | genpd_sync_power_off(genpd, true, 0); |
1149 | genpd_unlock(genpd); | |
596ba34b RW |
1150 | |
1151 | return 0; | |
1152 | } | |
1153 | ||
10da6542 | 1154 | /** |
9e9704ea | 1155 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1156 | * @dev: Device to suspend. |
1157 | * | |
1158 | * Stop the device and remove power from the domain if all devices in it have | |
1159 | * been stopped. | |
1160 | */ | |
9e9704ea | 1161 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1162 | { |
1163 | dev_dbg(dev, "%s()\n", __func__); | |
1164 | ||
1165 | return genpd_finish_suspend(dev, false); | |
1166 | } | |
1167 | ||
596ba34b | 1168 | /** |
9e9704ea | 1169 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1170 | * @dev: Device to resume. |
1171 | * | |
0496c8ae | 1172 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1173 | */ |
9e9704ea | 1174 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1175 | { |
1176 | struct generic_pm_domain *genpd; | |
a935424b | 1177 | int ret; |
596ba34b RW |
1178 | |
1179 | dev_dbg(dev, "%s()\n", __func__); | |
1180 | ||
1181 | genpd = dev_to_genpd(dev); | |
1182 | if (IS_ERR(genpd)) | |
1183 | return -EINVAL; | |
1184 | ||
d0af45f1 | 1185 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1186 | return pm_generic_resume_noirq(dev); |
596ba34b | 1187 | |
0883ac03 UH |
1188 | genpd_lock(genpd); |
1189 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1190 | genpd->suspended_count--; |
0883ac03 | 1191 | genpd_unlock(genpd); |
596ba34b | 1192 | |
17218e00 RW |
1193 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1194 | !pm_runtime_status_suspended(dev)) { | |
1195 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1196 | if (ret) |
1197 | return ret; | |
1198 | } | |
122a2237 | 1199 | |
a935424b | 1200 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1201 | } |
1202 | ||
0496c8ae | 1203 | /** |
9e9704ea | 1204 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1205 | * @dev: Device to freeze. |
1206 | * | |
1207 | * Carry out a late freeze of a device under the assumption that its | |
1208 | * pm_domain field points to the domain member of an object of type | |
1209 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1210 | * devices. | |
1211 | */ | |
9e9704ea | 1212 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1213 | { |
d8600c8b | 1214 | const struct generic_pm_domain *genpd; |
122a2237 | 1215 | int ret = 0; |
596ba34b RW |
1216 | |
1217 | dev_dbg(dev, "%s()\n", __func__); | |
1218 | ||
1219 | genpd = dev_to_genpd(dev); | |
1220 | if (IS_ERR(genpd)) | |
1221 | return -EINVAL; | |
1222 | ||
10da6542 MP |
1223 | ret = pm_generic_freeze_noirq(dev); |
1224 | if (ret) | |
1225 | return ret; | |
1226 | ||
17218e00 RW |
1227 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1228 | !pm_runtime_status_suspended(dev)) | |
1229 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1230 | |
1231 | return ret; | |
0496c8ae | 1232 | } |
596ba34b | 1233 | |
0496c8ae | 1234 | /** |
9e9704ea | 1235 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1236 | * @dev: Device to thaw. |
1237 | * | |
1238 | * Start the device, unless power has been removed from the domain already | |
1239 | * before the system transition. | |
1240 | */ | |
9e9704ea | 1241 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1242 | { |
d8600c8b | 1243 | const struct generic_pm_domain *genpd; |
122a2237 | 1244 | int ret = 0; |
596ba34b | 1245 | |
0496c8ae | 1246 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1247 | |
0496c8ae RW |
1248 | genpd = dev_to_genpd(dev); |
1249 | if (IS_ERR(genpd)) | |
1250 | return -EINVAL; | |
1251 | ||
17218e00 RW |
1252 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1253 | !pm_runtime_status_suspended(dev)) { | |
1254 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1255 | if (ret) |
1256 | return ret; | |
1257 | } | |
122a2237 | 1258 | |
10da6542 MP |
1259 | return pm_generic_thaw_noirq(dev); |
1260 | } | |
1261 | ||
1262 | /** | |
9e9704ea | 1263 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1264 | * I/O PM domain. |
1265 | * @dev: Device to poweroff. | |
1266 | * | |
1267 | * Stop the device and remove power from the domain if all devices in it have | |
1268 | * been stopped. | |
1269 | */ | |
9e9704ea | 1270 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1271 | { |
1272 | dev_dbg(dev, "%s()\n", __func__); | |
1273 | ||
1274 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1275 | } |
1276 | ||
596ba34b | 1277 | /** |
9e9704ea | 1278 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1279 | * @dev: Device to resume. |
1280 | * | |
0496c8ae RW |
1281 | * Make sure the domain will be in the same power state as before the |
1282 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1283 | */ |
9e9704ea | 1284 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1285 | { |
1286 | struct generic_pm_domain *genpd; | |
122a2237 | 1287 | int ret = 0; |
596ba34b RW |
1288 | |
1289 | dev_dbg(dev, "%s()\n", __func__); | |
1290 | ||
1291 | genpd = dev_to_genpd(dev); | |
1292 | if (IS_ERR(genpd)) | |
1293 | return -EINVAL; | |
1294 | ||
1295 | /* | |
65533bbf RW |
1296 | * At this point suspended_count == 0 means we are being run for the |
1297 | * first time for the given domain in the present cycle. | |
596ba34b | 1298 | */ |
0883ac03 | 1299 | genpd_lock(genpd); |
39dd0f23 | 1300 | if (genpd->suspended_count++ == 0) |
596ba34b | 1301 | /* |
65533bbf | 1302 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1303 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1304 | * so that it tries to power it on in case it was really off. |
596ba34b | 1305 | */ |
65533bbf | 1306 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1307 | |
0883ac03 UH |
1308 | genpd_sync_power_on(genpd, true, 0); |
1309 | genpd_unlock(genpd); | |
596ba34b | 1310 | |
17218e00 RW |
1311 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1312 | !pm_runtime_status_suspended(dev)) { | |
1313 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1314 | if (ret) |
1315 | return ret; | |
1316 | } | |
122a2237 | 1317 | |
10da6542 | 1318 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1319 | } |
1320 | ||
1321 | /** | |
9e9704ea | 1322 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1323 | * @dev: Device to complete the transition of. |
1324 | * | |
1325 | * Complete a power transition of a device (during a system-wide power | |
1326 | * transition) under the assumption that its pm_domain field points to the | |
1327 | * domain member of an object of type struct generic_pm_domain representing | |
1328 | * a power domain consisting of I/O devices. | |
1329 | */ | |
9e9704ea | 1330 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1331 | { |
1332 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1333 | |
1334 | dev_dbg(dev, "%s()\n", __func__); | |
1335 | ||
1336 | genpd = dev_to_genpd(dev); | |
1337 | if (IS_ERR(genpd)) | |
1338 | return; | |
1339 | ||
4d23a5e8 UH |
1340 | pm_generic_complete(dev); |
1341 | ||
35241d12 | 1342 | genpd_lock(genpd); |
596ba34b | 1343 | |
39dd0f23 | 1344 | genpd->prepared_count--; |
4d23a5e8 UH |
1345 | if (!genpd->prepared_count) |
1346 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1347 | |
35241d12 | 1348 | genpd_unlock(genpd); |
596ba34b RW |
1349 | } |
1350 | ||
77f827de | 1351 | /** |
d47e6464 | 1352 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1353 | * @dev: Device that normally is marked as "always on" to switch power for. |
1354 | * | |
1355 | * This routine may only be called during the system core (syscore) suspend or | |
1356 | * resume phase for devices whose "always on" flags are set. | |
1357 | */ | |
d47e6464 | 1358 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1359 | { |
1360 | struct generic_pm_domain *genpd; | |
1361 | ||
23c6d2c7 | 1362 | genpd = dev_to_genpd(dev); |
9e9704ea | 1363 | if (!genpd_present(genpd)) |
77f827de RW |
1364 | return; |
1365 | ||
1366 | if (suspend) { | |
1367 | genpd->suspended_count++; | |
0883ac03 | 1368 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1369 | } else { |
0883ac03 | 1370 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1371 | genpd->suspended_count--; |
1372 | } | |
1373 | } | |
d47e6464 UH |
1374 | |
1375 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1376 | { | |
1377 | genpd_syscore_switch(dev, true); | |
1378 | } | |
1379 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1380 | ||
1381 | void pm_genpd_syscore_poweron(struct device *dev) | |
1382 | { | |
1383 | genpd_syscore_switch(dev, false); | |
1384 | } | |
1385 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1386 | |
d30d819d | 1387 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1388 | |
9e9704ea UH |
1389 | #define genpd_prepare NULL |
1390 | #define genpd_suspend_noirq NULL | |
1391 | #define genpd_resume_noirq NULL | |
1392 | #define genpd_freeze_noirq NULL | |
1393 | #define genpd_thaw_noirq NULL | |
1394 | #define genpd_poweroff_noirq NULL | |
1395 | #define genpd_restore_noirq NULL | |
1396 | #define genpd_complete NULL | |
596ba34b RW |
1397 | |
1398 | #endif /* CONFIG_PM_SLEEP */ | |
1399 | ||
a174920d | 1400 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) |
1d5fcfec RW |
1401 | { |
1402 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1403 | int ret; |
1404 | ||
1405 | ret = dev_pm_get_subsys_data(dev); | |
1406 | if (ret) | |
1407 | return ERR_PTR(ret); | |
1d5fcfec RW |
1408 | |
1409 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1410 | if (!gpd_data) { |
1411 | ret = -ENOMEM; | |
1412 | goto err_put; | |
1413 | } | |
1d5fcfec | 1414 | |
f104e1e5 | 1415 | gpd_data->base.dev = dev; |
f104e1e5 | 1416 | gpd_data->td.constraint_changed = true; |
0759e80b | 1417 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1418 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1419 | ||
1420 | spin_lock_irq(&dev->power.lock); | |
1421 | ||
1422 | if (dev->power.subsys_data->domain_data) { | |
1423 | ret = -EINVAL; | |
1424 | goto err_free; | |
1425 | } | |
1426 | ||
1427 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1428 | |
1429 | spin_unlock_irq(&dev->power.lock); | |
1430 | ||
1d5fcfec | 1431 | return gpd_data; |
3e235685 | 1432 | |
f104e1e5 UH |
1433 | err_free: |
1434 | spin_unlock_irq(&dev->power.lock); | |
1435 | kfree(gpd_data); | |
3e235685 UH |
1436 | err_put: |
1437 | dev_pm_put_subsys_data(dev); | |
1438 | return ERR_PTR(ret); | |
1d5fcfec RW |
1439 | } |
1440 | ||
49d400c7 UH |
1441 | static void genpd_free_dev_data(struct device *dev, |
1442 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1443 | { |
f104e1e5 UH |
1444 | spin_lock_irq(&dev->power.lock); |
1445 | ||
f104e1e5 UH |
1446 | dev->power.subsys_data->domain_data = NULL; |
1447 | ||
1448 | spin_unlock_irq(&dev->power.lock); | |
1449 | ||
1d5fcfec | 1450 | kfree(gpd_data); |
3e235685 | 1451 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1452 | } |
1453 | ||
b24e1965 UH |
1454 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1455 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1456 | { |
1457 | struct gpd_link *link; | |
1458 | ||
1459 | if (!genpd_is_cpu_domain(genpd)) | |
1460 | return; | |
1461 | ||
1462 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
1463 | struct generic_pm_domain *master = link->master; | |
1464 | ||
1465 | genpd_lock_nested(master, depth + 1); | |
b24e1965 | 1466 | genpd_update_cpumask(master, cpu, set, depth + 1); |
eb594b73 UH |
1467 | genpd_unlock(master); |
1468 | } | |
1469 | ||
1470 | if (set) | |
1471 | cpumask_set_cpu(cpu, genpd->cpus); | |
1472 | else | |
1473 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1474 | } | |
1475 | ||
b24e1965 UH |
1476 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1477 | { | |
1478 | if (cpu >= 0) | |
1479 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1480 | } | |
1481 | ||
1482 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1483 | { | |
1484 | if (cpu >= 0) | |
1485 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1486 | } | |
1487 | ||
1488 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1489 | { |
1490 | int cpu; | |
1491 | ||
1492 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1493 | return -1; |
eb594b73 UH |
1494 | |
1495 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1496 | if (get_cpu_device(cpu) == dev) |
1497 | return cpu; | |
eb594b73 | 1498 | } |
eb594b73 | 1499 | |
b24e1965 | 1500 | return -1; |
eb594b73 UH |
1501 | } |
1502 | ||
f9ccd7c3 UH |
1503 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1504 | struct device *base_dev) | |
f721889f | 1505 | { |
c0356db7 | 1506 | struct generic_pm_domain_data *gpd_data; |
f9ccd7c3 | 1507 | int ret; |
f721889f RW |
1508 | |
1509 | dev_dbg(dev, "%s()\n", __func__); | |
1510 | ||
1511 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1512 | return -EINVAL; | |
1513 | ||
a174920d | 1514 | gpd_data = genpd_alloc_dev_data(dev); |
3e235685 UH |
1515 | if (IS_ERR(gpd_data)) |
1516 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1517 | |
f9ccd7c3 | 1518 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
b24e1965 | 1519 | |
b472c2fa UH |
1520 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1521 | if (ret) | |
1522 | goto out; | |
d79b6fe1 | 1523 | |
2071ac98 JW |
1524 | genpd_lock(genpd); |
1525 | ||
f9ccd7c3 | 1526 | genpd_set_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1527 | dev_pm_domain_set(dev, &genpd->domain); |
1528 | ||
14b53064 UH |
1529 | genpd->device_count++; |
1530 | genpd->max_off_time_changed = true; | |
1531 | ||
1d5fcfec | 1532 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1533 | |
35241d12 | 1534 | genpd_unlock(genpd); |
2071ac98 | 1535 | out: |
c0356db7 UH |
1536 | if (ret) |
1537 | genpd_free_dev_data(dev, gpd_data); | |
1538 | else | |
0b07ee94 VK |
1539 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
1540 | DEV_PM_QOS_RESUME_LATENCY); | |
1d5fcfec | 1541 | |
f721889f RW |
1542 | return ret; |
1543 | } | |
19efa5ff JH |
1544 | |
1545 | /** | |
1a7a6707 | 1546 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1547 | * @genpd: PM domain to add the device to. |
1548 | * @dev: Device to be added. | |
19efa5ff | 1549 | */ |
1a7a6707 | 1550 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1551 | { |
1552 | int ret; | |
1553 | ||
1554 | mutex_lock(&gpd_list_lock); | |
f9ccd7c3 | 1555 | ret = genpd_add_device(genpd, dev, dev); |
19efa5ff JH |
1556 | mutex_unlock(&gpd_list_lock); |
1557 | ||
1558 | return ret; | |
1559 | } | |
1a7a6707 | 1560 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1561 | |
85168d56 UH |
1562 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1563 | struct device *dev) | |
f721889f | 1564 | { |
6ff7bb0d | 1565 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1566 | struct pm_domain_data *pdd; |
f9ccd7c3 | 1567 | int ret = 0; |
f721889f RW |
1568 | |
1569 | dev_dbg(dev, "%s()\n", __func__); | |
1570 | ||
c0356db7 UH |
1571 | pdd = dev->power.subsys_data->domain_data; |
1572 | gpd_data = to_gpd_data(pdd); | |
0b07ee94 VK |
1573 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
1574 | DEV_PM_QOS_RESUME_LATENCY); | |
c0356db7 | 1575 | |
35241d12 | 1576 | genpd_lock(genpd); |
f721889f | 1577 | |
596ba34b RW |
1578 | if (genpd->prepared_count > 0) { |
1579 | ret = -EAGAIN; | |
1580 | goto out; | |
1581 | } | |
1582 | ||
6ff7bb0d RW |
1583 | genpd->device_count--; |
1584 | genpd->max_off_time_changed = true; | |
1585 | ||
f9ccd7c3 | 1586 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1587 | dev_pm_domain_set(dev, NULL); |
1588 | ||
efa69025 | 1589 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1590 | |
35241d12 | 1591 | genpd_unlock(genpd); |
6ff7bb0d | 1592 | |
2071ac98 JW |
1593 | if (genpd->detach_dev) |
1594 | genpd->detach_dev(genpd, dev); | |
1595 | ||
c1dbe2fb | 1596 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1597 | |
6ff7bb0d | 1598 | return 0; |
f721889f | 1599 | |
596ba34b | 1600 | out: |
35241d12 | 1601 | genpd_unlock(genpd); |
0b07ee94 | 1602 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
f721889f RW |
1603 | |
1604 | return ret; | |
1605 | } | |
85168d56 UH |
1606 | |
1607 | /** | |
1608 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1609 | * @dev: Device to be removed. |
1610 | */ | |
924f4486 | 1611 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1612 | { |
924f4486 UH |
1613 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1614 | ||
1615 | if (!genpd) | |
85168d56 UH |
1616 | return -EINVAL; |
1617 | ||
1618 | return genpd_remove_device(genpd, dev); | |
1619 | } | |
24c96dc7 | 1620 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1621 | |
19efa5ff JH |
1622 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1623 | struct generic_pm_domain *subdomain) | |
f721889f | 1624 | { |
2547923d | 1625 | struct gpd_link *link, *itr; |
f721889f RW |
1626 | int ret = 0; |
1627 | ||
fb7268be RW |
1628 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1629 | || genpd == subdomain) | |
f721889f RW |
1630 | return -EINVAL; |
1631 | ||
d716f479 LI |
1632 | /* |
1633 | * If the domain can be powered on/off in an IRQ safe | |
1634 | * context, ensure that the subdomain can also be | |
1635 | * powered on/off in that context. | |
1636 | */ | |
1637 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1638 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1639 | genpd->name, subdomain->name); |
1640 | return -EINVAL; | |
1641 | } | |
1642 | ||
2547923d LI |
1643 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1644 | if (!link) | |
1645 | return -ENOMEM; | |
1646 | ||
35241d12 LI |
1647 | genpd_lock(subdomain); |
1648 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1649 | |
41e2c8e0 | 1650 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1651 | ret = -EINVAL; |
1652 | goto out; | |
1653 | } | |
1654 | ||
2547923d LI |
1655 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1656 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1657 | ret = -EINVAL; |
1658 | goto out; | |
1659 | } | |
1660 | } | |
1661 | ||
5063ce15 RW |
1662 | link->master = genpd; |
1663 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1664 | link->slave = subdomain; |
1665 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1666 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1667 | genpd_sd_counter_inc(genpd); |
f721889f | 1668 | |
f721889f | 1669 | out: |
35241d12 LI |
1670 | genpd_unlock(genpd); |
1671 | genpd_unlock(subdomain); | |
2547923d LI |
1672 | if (ret) |
1673 | kfree(link); | |
f721889f RW |
1674 | return ret; |
1675 | } | |
19efa5ff JH |
1676 | |
1677 | /** | |
1678 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1679 | * @genpd: Master PM domain to add the subdomain to. | |
1680 | * @subdomain: Subdomain to be added. | |
1681 | */ | |
1682 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1683 | struct generic_pm_domain *subdomain) | |
1684 | { | |
1685 | int ret; | |
1686 | ||
1687 | mutex_lock(&gpd_list_lock); | |
1688 | ret = genpd_add_subdomain(genpd, subdomain); | |
1689 | mutex_unlock(&gpd_list_lock); | |
1690 | ||
1691 | return ret; | |
1692 | } | |
d60ee966 | 1693 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1694 | |
1695 | /** | |
1696 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1697 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1698 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1699 | */ |
1700 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1701 | struct generic_pm_domain *subdomain) |
f721889f | 1702 | { |
c6e83cac | 1703 | struct gpd_link *l, *link; |
f721889f RW |
1704 | int ret = -EINVAL; |
1705 | ||
5063ce15 | 1706 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1707 | return -EINVAL; |
1708 | ||
35241d12 LI |
1709 | genpd_lock(subdomain); |
1710 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1711 | |
beda5fc1 | 1712 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
7a5bd127 JP |
1713 | pr_warn("%s: unable to remove subdomain %s\n", |
1714 | genpd->name, subdomain->name); | |
30e7a65b JH |
1715 | ret = -EBUSY; |
1716 | goto out; | |
1717 | } | |
1718 | ||
c6e83cac | 1719 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1720 | if (link->slave != subdomain) |
f721889f RW |
1721 | continue; |
1722 | ||
5063ce15 RW |
1723 | list_del(&link->master_node); |
1724 | list_del(&link->slave_node); | |
1725 | kfree(link); | |
41e2c8e0 | 1726 | if (genpd_status_on(subdomain)) |
f721889f RW |
1727 | genpd_sd_counter_dec(genpd); |
1728 | ||
f721889f RW |
1729 | ret = 0; |
1730 | break; | |
1731 | } | |
1732 | ||
30e7a65b | 1733 | out: |
35241d12 LI |
1734 | genpd_unlock(genpd); |
1735 | genpd_unlock(subdomain); | |
f721889f RW |
1736 | |
1737 | return ret; | |
1738 | } | |
d60ee966 | 1739 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1740 | |
49a27e27 UH |
1741 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1742 | unsigned int state_count) | |
1743 | { | |
1744 | kfree(states); | |
1745 | } | |
1746 | ||
59d65b73 LI |
1747 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1748 | { | |
1749 | struct genpd_power_state *state; | |
1750 | ||
1751 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1752 | if (!state) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | genpd->states = state; | |
1756 | genpd->state_count = 1; | |
49a27e27 | 1757 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1758 | |
1759 | return 0; | |
1760 | } | |
1761 | ||
d716f479 LI |
1762 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1763 | { | |
1764 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1765 | spin_lock_init(&genpd->slock); | |
1766 | genpd->lock_ops = &genpd_spin_ops; | |
1767 | } else { | |
1768 | mutex_init(&genpd->mlock); | |
1769 | genpd->lock_ops = &genpd_mtx_ops; | |
1770 | } | |
1771 | } | |
1772 | ||
f721889f RW |
1773 | /** |
1774 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1775 | * @genpd: PM domain object to initialize. | |
1776 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1777 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1778 | * |
1779 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1780 | */ |
7eb231c3 UH |
1781 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1782 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1783 | { |
59d65b73 LI |
1784 | int ret; |
1785 | ||
f721889f | 1786 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1787 | return -EINVAL; |
f721889f | 1788 | |
5063ce15 RW |
1789 | INIT_LIST_HEAD(&genpd->master_links); |
1790 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1791 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1792 | genpd_lock_init(genpd); |
f721889f RW |
1793 | genpd->gov = gov; |
1794 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1795 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1796 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1797 | genpd->device_count = 0; |
221e9b58 | 1798 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1799 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1800 | genpd->provider = NULL; |
1801 | genpd->has_provider = false; | |
afece3ab | 1802 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1803 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1804 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1805 | genpd->domain.ops.prepare = genpd_prepare; |
1806 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1807 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1808 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1809 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1810 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1811 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1812 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1813 | |
1814 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1815 | genpd->dev_ops.stop = pm_clk_suspend; | |
1816 | genpd->dev_ops.start = pm_clk_resume; | |
1817 | } | |
1818 | ||
ffaa42e8 | 1819 | /* Always-on domains must be powered on at initialization. */ |
ed61e18a LC |
1820 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
1821 | !genpd_status_on(genpd)) | |
ffaa42e8 UH |
1822 | return -EINVAL; |
1823 | ||
eb594b73 UH |
1824 | if (genpd_is_cpu_domain(genpd) && |
1825 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
1826 | return -ENOMEM; | |
1827 | ||
fc5cbf0c | 1828 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1829 | if (genpd->state_count == 0) { |
1830 | ret = genpd_set_default_power_state(genpd); | |
eb594b73 UH |
1831 | if (ret) { |
1832 | if (genpd_is_cpu_domain(genpd)) | |
1833 | free_cpumask_var(genpd->cpus); | |
59d65b73 | 1834 | return ret; |
eb594b73 | 1835 | } |
46b7fe94 | 1836 | } else if (!gov && genpd->state_count > 1) { |
7a5bd127 | 1837 | pr_warn("%s: no governor for states\n", genpd->name); |
59d65b73 | 1838 | } |
fc5cbf0c | 1839 | |
401ea157 VK |
1840 | device_initialize(&genpd->dev); |
1841 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1842 | ||
5125bbf3 RW |
1843 | mutex_lock(&gpd_list_lock); |
1844 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1845 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1846 | |
1847 | return 0; | |
5125bbf3 | 1848 | } |
be5ed55d | 1849 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1850 | |
3fe57710 JH |
1851 | static int genpd_remove(struct generic_pm_domain *genpd) |
1852 | { | |
1853 | struct gpd_link *l, *link; | |
1854 | ||
1855 | if (IS_ERR_OR_NULL(genpd)) | |
1856 | return -EINVAL; | |
1857 | ||
35241d12 | 1858 | genpd_lock(genpd); |
3fe57710 JH |
1859 | |
1860 | if (genpd->has_provider) { | |
35241d12 | 1861 | genpd_unlock(genpd); |
3fe57710 JH |
1862 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1863 | return -EBUSY; | |
1864 | } | |
1865 | ||
1866 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1867 | genpd_unlock(genpd); |
3fe57710 JH |
1868 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1869 | return -EBUSY; | |
1870 | } | |
1871 | ||
1872 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1873 | list_del(&link->master_node); | |
1874 | list_del(&link->slave_node); | |
1875 | kfree(link); | |
1876 | } | |
1877 | ||
1878 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1879 | genpd_unlock(genpd); |
3fe57710 | 1880 | cancel_work_sync(&genpd->power_off_work); |
eb594b73 UH |
1881 | if (genpd_is_cpu_domain(genpd)) |
1882 | free_cpumask_var(genpd->cpus); | |
49a27e27 UH |
1883 | if (genpd->free_states) |
1884 | genpd->free_states(genpd->states, genpd->state_count); | |
1885 | ||
3fe57710 JH |
1886 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1887 | ||
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | /** | |
1892 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1893 | * @genpd: Pointer to PM domain that is to be removed. | |
1894 | * | |
1895 | * To remove the PM domain, this function: | |
1896 | * - Removes the PM domain as a subdomain to any parent domains, | |
1897 | * if it was added. | |
1898 | * - Removes the PM domain from the list of registered PM domains. | |
1899 | * | |
1900 | * The PM domain will only be removed, if the associated provider has | |
1901 | * been removed, it is not a parent to any other PM domain and has no | |
1902 | * devices associated with it. | |
1903 | */ | |
1904 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1905 | { | |
1906 | int ret; | |
1907 | ||
1908 | mutex_lock(&gpd_list_lock); | |
1909 | ret = genpd_remove(genpd); | |
1910 | mutex_unlock(&gpd_list_lock); | |
1911 | ||
1912 | return ret; | |
1913 | } | |
1914 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1915 | ||
aa42240a | 1916 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1917 | |
aa42240a TF |
1918 | /* |
1919 | * Device Tree based PM domain providers. | |
1920 | * | |
1921 | * The code below implements generic device tree based PM domain providers that | |
1922 | * bind device tree nodes with generic PM domains registered in the system. | |
1923 | * | |
1924 | * Any driver that registers generic PM domains and needs to support binding of | |
1925 | * devices to these domains is supposed to register a PM domain provider, which | |
1926 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1927 | * | |
1928 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1929 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1930 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1931 | * index. |
1932 | */ | |
1933 | ||
1934 | /** | |
1935 | * struct of_genpd_provider - PM domain provider registration structure | |
1936 | * @link: Entry in global list of PM domain providers | |
1937 | * @node: Pointer to device tree node of PM domain provider | |
1938 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1939 | * into a PM domain. | |
1940 | * @data: context pointer to be passed into @xlate callback | |
1941 | */ | |
1942 | struct of_genpd_provider { | |
1943 | struct list_head link; | |
1944 | struct device_node *node; | |
1945 | genpd_xlate_t xlate; | |
1946 | void *data; | |
1947 | }; | |
1948 | ||
1949 | /* List of registered PM domain providers. */ | |
1950 | static LIST_HEAD(of_genpd_providers); | |
1951 | /* Mutex to protect the list above. */ | |
1952 | static DEFINE_MUTEX(of_genpd_mutex); | |
1953 | ||
1954 | /** | |
892ebdcc | 1955 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1956 | * @genpdspec: OF phandle args to map into a PM domain |
1957 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1958 | * | |
1959 | * This is a generic xlate function that can be used to model PM domains that | |
1960 | * have their own device tree nodes. The private data of xlate function needs | |
1961 | * to be a valid pointer to struct generic_pm_domain. | |
1962 | */ | |
892ebdcc | 1963 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1964 | struct of_phandle_args *genpdspec, |
1965 | void *data) | |
1966 | { | |
aa42240a TF |
1967 | return data; |
1968 | } | |
aa42240a TF |
1969 | |
1970 | /** | |
892ebdcc | 1971 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1972 | * @genpdspec: OF phandle args to map into a PM domain |
1973 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1974 | * | |
1975 | * This is a generic xlate function that can be used to model simple PM domain | |
1976 | * controllers that have one device tree node and provide multiple PM domains. | |
1977 | * A single cell is used as an index into an array of PM domains specified in | |
1978 | * the genpd_onecell_data struct when registering the provider. | |
1979 | */ | |
892ebdcc | 1980 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1981 | struct of_phandle_args *genpdspec, |
1982 | void *data) | |
1983 | { | |
1984 | struct genpd_onecell_data *genpd_data = data; | |
1985 | unsigned int idx = genpdspec->args[0]; | |
1986 | ||
1987 | if (genpdspec->args_count != 1) | |
1988 | return ERR_PTR(-EINVAL); | |
1989 | ||
1990 | if (idx >= genpd_data->num_domains) { | |
1991 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1992 | return ERR_PTR(-EINVAL); | |
1993 | } | |
1994 | ||
1995 | if (!genpd_data->domains[idx]) | |
1996 | return ERR_PTR(-ENOENT); | |
1997 | ||
1998 | return genpd_data->domains[idx]; | |
1999 | } | |
aa42240a TF |
2000 | |
2001 | /** | |
892ebdcc | 2002 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
2003 | * @np: Device node pointer associated with the PM domain provider. |
2004 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2005 | * @data: Context pointer for @xlate callback. | |
2006 | */ | |
892ebdcc JH |
2007 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2008 | void *data) | |
aa42240a TF |
2009 | { |
2010 | struct of_genpd_provider *cp; | |
2011 | ||
2012 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2013 | if (!cp) | |
2014 | return -ENOMEM; | |
2015 | ||
2016 | cp->node = of_node_get(np); | |
2017 | cp->data = data; | |
2018 | cp->xlate = xlate; | |
2019 | ||
2020 | mutex_lock(&of_genpd_mutex); | |
2021 | list_add(&cp->link, &of_genpd_providers); | |
2022 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2023 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2024 | |
2025 | return 0; | |
2026 | } | |
892ebdcc JH |
2027 | |
2028 | /** | |
2029 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2030 | * @np: Device node pointer associated with the PM domain provider. | |
2031 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2032 | */ | |
2033 | int of_genpd_add_provider_simple(struct device_node *np, | |
2034 | struct generic_pm_domain *genpd) | |
2035 | { | |
0159ec67 JH |
2036 | int ret = -EINVAL; |
2037 | ||
2038 | if (!np || !genpd) | |
2039 | return -EINVAL; | |
2040 | ||
2041 | mutex_lock(&gpd_list_lock); | |
2042 | ||
6a0ae73d VK |
2043 | if (!genpd_present(genpd)) |
2044 | goto unlock; | |
2045 | ||
2046 | genpd->dev.of_node = np; | |
2047 | ||
2048 | /* Parse genpd OPP table */ | |
2049 | if (genpd->set_performance_state) { | |
2050 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
2051 | if (ret) { | |
2052 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
2053 | ret); | |
2054 | goto unlock; | |
8ce95844 | 2055 | } |
1067ae3e VK |
2056 | |
2057 | /* | |
2058 | * Save table for faster processing while setting performance | |
2059 | * state. | |
2060 | */ | |
2061 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
2062 | WARN_ON(!genpd->opp_table); | |
de0aa06d JH |
2063 | } |
2064 | ||
6a0ae73d VK |
2065 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2066 | if (ret) { | |
1067ae3e VK |
2067 | if (genpd->set_performance_state) { |
2068 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2069 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2070 | } |
6a0ae73d VK |
2071 | |
2072 | goto unlock; | |
2073 | } | |
2074 | ||
2075 | genpd->provider = &np->fwnode; | |
2076 | genpd->has_provider = true; | |
2077 | ||
2078 | unlock: | |
0159ec67 JH |
2079 | mutex_unlock(&gpd_list_lock); |
2080 | ||
2081 | return ret; | |
892ebdcc JH |
2082 | } |
2083 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2084 | ||
2085 | /** | |
2086 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2087 | * @np: Device node pointer associated with the PM domain provider. | |
2088 | * @data: Pointer to the data associated with the PM domain provider. | |
2089 | */ | |
2090 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2091 | struct genpd_onecell_data *data) | |
2092 | { | |
6a0ae73d | 2093 | struct generic_pm_domain *genpd; |
0159ec67 | 2094 | unsigned int i; |
de0aa06d | 2095 | int ret = -EINVAL; |
0159ec67 JH |
2096 | |
2097 | if (!np || !data) | |
2098 | return -EINVAL; | |
2099 | ||
2100 | mutex_lock(&gpd_list_lock); | |
2101 | ||
40845524 TR |
2102 | if (!data->xlate) |
2103 | data->xlate = genpd_xlate_onecell; | |
2104 | ||
0159ec67 | 2105 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2106 | genpd = data->domains[i]; |
2107 | ||
2108 | if (!genpd) | |
609bed67 | 2109 | continue; |
6a0ae73d | 2110 | if (!genpd_present(genpd)) |
de0aa06d JH |
2111 | goto error; |
2112 | ||
6a0ae73d VK |
2113 | genpd->dev.of_node = np; |
2114 | ||
2115 | /* Parse genpd OPP table */ | |
2116 | if (genpd->set_performance_state) { | |
2117 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2118 | if (ret) { | |
2119 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2120 | i, ret); | |
2121 | goto error; | |
2122 | } | |
1067ae3e VK |
2123 | |
2124 | /* | |
2125 | * Save table for faster processing while setting | |
2126 | * performance state. | |
2127 | */ | |
2128 | genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); | |
2129 | WARN_ON(!genpd->opp_table); | |
6a0ae73d VK |
2130 | } |
2131 | ||
2132 | genpd->provider = &np->fwnode; | |
2133 | genpd->has_provider = true; | |
0159ec67 JH |
2134 | } |
2135 | ||
40845524 | 2136 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2137 | if (ret < 0) |
2138 | goto error; | |
2139 | ||
2140 | mutex_unlock(&gpd_list_lock); | |
2141 | ||
2142 | return 0; | |
2143 | ||
2144 | error: | |
2145 | while (i--) { | |
6a0ae73d VK |
2146 | genpd = data->domains[i]; |
2147 | ||
2148 | if (!genpd) | |
609bed67 | 2149 | continue; |
6a0ae73d VK |
2150 | |
2151 | genpd->provider = NULL; | |
2152 | genpd->has_provider = false; | |
2153 | ||
1067ae3e VK |
2154 | if (genpd->set_performance_state) { |
2155 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2156 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2157 | } |
de0aa06d | 2158 | } |
0159ec67 JH |
2159 | |
2160 | mutex_unlock(&gpd_list_lock); | |
2161 | ||
2162 | return ret; | |
892ebdcc JH |
2163 | } |
2164 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2165 | |
2166 | /** | |
2167 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2168 | * @np: Device node pointer associated with the PM domain provider | |
2169 | */ | |
2170 | void of_genpd_del_provider(struct device_node *np) | |
2171 | { | |
b556b15d | 2172 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2173 | struct generic_pm_domain *gpd; |
aa42240a | 2174 | |
de0aa06d | 2175 | mutex_lock(&gpd_list_lock); |
aa42240a | 2176 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2177 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2178 | if (cp->node == np) { |
de0aa06d JH |
2179 | /* |
2180 | * For each PM domain associated with the | |
2181 | * provider, set the 'has_provider' to false | |
2182 | * so that the PM domain can be safely removed. | |
2183 | */ | |
6a0ae73d VK |
2184 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2185 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2186 | gpd->has_provider = false; |
2187 | ||
6a0ae73d VK |
2188 | if (!gpd->set_performance_state) |
2189 | continue; | |
2190 | ||
1067ae3e | 2191 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2192 | dev_pm_opp_of_remove_table(&gpd->dev); |
2193 | } | |
2194 | } | |
2195 | ||
aa42240a TF |
2196 | list_del(&cp->link); |
2197 | of_node_put(cp->node); | |
2198 | kfree(cp); | |
2199 | break; | |
2200 | } | |
2201 | } | |
2202 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2203 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2204 | } |
2205 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2206 | ||
2207 | /** | |
f58d4e5a | 2208 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2209 | * @genpdspec: OF phandle args to use for look-up |
2210 | * | |
2211 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2212 | * found, uses xlate function of the provider to map phandle args to a PM | |
2213 | * domain. | |
2214 | * | |
2215 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2216 | * on failure. | |
2217 | */ | |
f58d4e5a | 2218 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2219 | struct of_phandle_args *genpdspec) |
2220 | { | |
2221 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2222 | struct of_genpd_provider *provider; | |
2223 | ||
41795a8a JH |
2224 | if (!genpdspec) |
2225 | return ERR_PTR(-EINVAL); | |
2226 | ||
aa42240a TF |
2227 | mutex_lock(&of_genpd_mutex); |
2228 | ||
2229 | /* Check if we have such a provider in our array */ | |
2230 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2231 | if (provider->node == genpdspec->np) | |
2232 | genpd = provider->xlate(genpdspec, provider->data); | |
2233 | if (!IS_ERR(genpd)) | |
2234 | break; | |
2235 | } | |
2236 | ||
2237 | mutex_unlock(&of_genpd_mutex); | |
2238 | ||
2239 | return genpd; | |
2240 | } | |
2241 | ||
ec69572b JH |
2242 | /** |
2243 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2244 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2245 | * @dev: Device to be added. | |
2246 | * | |
2247 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2248 | * the device to the PM domain. Returns a negative error code on failure. | |
2249 | */ | |
2250 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2251 | { | |
2252 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2253 | int ret; |
2254 | ||
2255 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2256 | |
f58d4e5a | 2257 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2258 | if (IS_ERR(genpd)) { |
2259 | ret = PTR_ERR(genpd); | |
2260 | goto out; | |
2261 | } | |
2262 | ||
f9ccd7c3 | 2263 | ret = genpd_add_device(genpd, dev, dev); |
ec69572b | 2264 | |
19efa5ff JH |
2265 | out: |
2266 | mutex_unlock(&gpd_list_lock); | |
2267 | ||
2268 | return ret; | |
ec69572b JH |
2269 | } |
2270 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2271 | ||
2272 | /** | |
2273 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2274 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2275 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2276 | * | |
2277 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2278 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2279 | * negative error code on failure. | |
2280 | */ | |
2281 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2282 | struct of_phandle_args *subdomain_spec) | |
2283 | { | |
2284 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2285 | int ret; |
2286 | ||
2287 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2288 | |
f58d4e5a | 2289 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2290 | if (IS_ERR(parent)) { |
2291 | ret = PTR_ERR(parent); | |
2292 | goto out; | |
2293 | } | |
ec69572b | 2294 | |
f58d4e5a | 2295 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2296 | if (IS_ERR(subdomain)) { |
2297 | ret = PTR_ERR(subdomain); | |
2298 | goto out; | |
2299 | } | |
2300 | ||
2301 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2302 | |
19efa5ff JH |
2303 | out: |
2304 | mutex_unlock(&gpd_list_lock); | |
2305 | ||
2306 | return ret; | |
ec69572b JH |
2307 | } |
2308 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2309 | ||
17926551 JH |
2310 | /** |
2311 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2312 | * @provider: Pointer to device structure associated with provider | |
2313 | * | |
2314 | * Find the last PM domain that was added by a particular provider and | |
2315 | * remove this PM domain from the list of PM domains. The provider is | |
2316 | * identified by the 'provider' device structure that is passed. The PM | |
2317 | * domain will only be removed, if the provider associated with domain | |
2318 | * has been removed. | |
2319 | * | |
2320 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2321 | * ERR_PTR() on failure. | |
2322 | */ | |
2323 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2324 | { | |
a7e2d1bc | 2325 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2326 | int ret; |
2327 | ||
2328 | if (IS_ERR_OR_NULL(np)) | |
2329 | return ERR_PTR(-EINVAL); | |
2330 | ||
2331 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2332 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2333 | if (gpd->provider == &np->fwnode) { |
2334 | ret = genpd_remove(gpd); | |
2335 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2336 | break; | |
2337 | } | |
2338 | } | |
2339 | mutex_unlock(&gpd_list_lock); | |
2340 | ||
2341 | return genpd; | |
2342 | } | |
2343 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2344 | ||
3c095f32 UH |
2345 | static void genpd_release_dev(struct device *dev) |
2346 | { | |
e8b04de9 | 2347 | of_node_put(dev->of_node); |
3c095f32 UH |
2348 | kfree(dev); |
2349 | } | |
2350 | ||
2351 | static struct bus_type genpd_bus_type = { | |
2352 | .name = "genpd", | |
2353 | }; | |
2354 | ||
aa42240a TF |
2355 | /** |
2356 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2357 | * @dev: Device to detach. |
aa42240a TF |
2358 | * @power_off: Currently not used |
2359 | * | |
2360 | * Try to locate a corresponding generic PM domain, which the device was | |
2361 | * attached to previously. If such is found, the device is detached from it. | |
2362 | */ | |
2363 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2364 | { | |
446d999c | 2365 | struct generic_pm_domain *pd; |
93af5e93 | 2366 | unsigned int i; |
aa42240a TF |
2367 | int ret = 0; |
2368 | ||
85168d56 UH |
2369 | pd = dev_to_genpd(dev); |
2370 | if (IS_ERR(pd)) | |
aa42240a TF |
2371 | return; |
2372 | ||
2373 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2374 | ||
93af5e93 | 2375 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2376 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2377 | if (ret != -EAGAIN) |
2378 | break; | |
93af5e93 GU |
2379 | |
2380 | mdelay(i); | |
aa42240a TF |
2381 | cond_resched(); |
2382 | } | |
2383 | ||
2384 | if (ret < 0) { | |
2385 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2386 | pd->name, ret); | |
2387 | return; | |
2388 | } | |
2389 | ||
2390 | /* Check if PM domain can be powered off after removing this device. */ | |
2391 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2392 | |
2393 | /* Unregister the device if it was created by genpd. */ | |
2394 | if (dev->bus == &genpd_bus_type) | |
2395 | device_unregister(dev); | |
aa42240a TF |
2396 | } |
2397 | ||
632f7ce3 RK |
2398 | static void genpd_dev_pm_sync(struct device *dev) |
2399 | { | |
2400 | struct generic_pm_domain *pd; | |
2401 | ||
2402 | pd = dev_to_genpd(dev); | |
2403 | if (IS_ERR(pd)) | |
2404 | return; | |
2405 | ||
2406 | genpd_queue_power_off_work(pd); | |
2407 | } | |
2408 | ||
51dcf748 UH |
2409 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2410 | unsigned int index, bool power_on) | |
aa42240a TF |
2411 | { |
2412 | struct of_phandle_args pd_args; | |
2413 | struct generic_pm_domain *pd; | |
2414 | int ret; | |
2415 | ||
e8b04de9 | 2416 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2417 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2418 | if (ret < 0) |
bcd931f2 | 2419 | return ret; |
aa42240a | 2420 | |
19efa5ff | 2421 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2422 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2423 | of_node_put(pd_args.np); |
aa42240a | 2424 | if (IS_ERR(pd)) { |
19efa5ff | 2425 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2426 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2427 | __func__, PTR_ERR(pd)); | |
51dcf748 | 2428 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2429 | } |
2430 | ||
2431 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2432 | ||
f9ccd7c3 | 2433 | ret = genpd_add_device(pd, dev, base_dev); |
19efa5ff | 2434 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2435 | |
2436 | if (ret < 0) { | |
34994692 GU |
2437 | if (ret != -EPROBE_DEFER) |
2438 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2439 | pd->name, ret); | |
919b7308 | 2440 | return ret; |
aa42240a TF |
2441 | } |
2442 | ||
2443 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2444 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2445 | |
895b6612 UH |
2446 | if (power_on) { |
2447 | genpd_lock(pd); | |
2448 | ret = genpd_power_on(pd, 0); | |
2449 | genpd_unlock(pd); | |
2450 | } | |
72038df3 UH |
2451 | |
2452 | if (ret) | |
2453 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2454 | |
2455 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2456 | } |
8cb1cbd6 UH |
2457 | |
2458 | /** | |
2459 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2460 | * @dev: Device to attach. | |
2461 | * | |
2462 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2463 | * attaches the device to retrieved pm_domain ops. | |
2464 | * | |
2465 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2466 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2467 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2468 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2469 | * not probed and to re-try again later. | |
2470 | */ | |
2471 | int genpd_dev_pm_attach(struct device *dev) | |
2472 | { | |
2473 | if (!dev->of_node) | |
2474 | return 0; | |
2475 | ||
2476 | /* | |
2477 | * Devices with multiple PM domains must be attached separately, as we | |
2478 | * can only attach one PM domain per device. | |
2479 | */ | |
2480 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2481 | "#power-domain-cells") != 1) | |
2482 | return 0; | |
2483 | ||
51dcf748 | 2484 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2485 | } |
aa42240a | 2486 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2487 | |
3c095f32 UH |
2488 | /** |
2489 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2490 | * @dev: The device used to lookup the PM domain. | |
2491 | * @index: The index of the PM domain. | |
2492 | * | |
2493 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2494 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2495 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2496 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2497 | * | |
2498 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2499 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2500 | * failures. If a power-domain exists for the device, but cannot be found or | |
2501 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2502 | * is not probed and to re-try again later. | |
2503 | */ | |
2504 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2505 | unsigned int index) | |
2506 | { | |
560928b2 | 2507 | struct device *virt_dev; |
3c095f32 UH |
2508 | int num_domains; |
2509 | int ret; | |
2510 | ||
2511 | if (!dev->of_node) | |
2512 | return NULL; | |
2513 | ||
3ccf3f0c | 2514 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2515 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2516 | "#power-domain-cells"); | |
3ccf3f0c | 2517 | if (index >= num_domains) |
3c095f32 UH |
2518 | return NULL; |
2519 | ||
2520 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2521 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2522 | if (!virt_dev) | |
3c095f32 UH |
2523 | return ERR_PTR(-ENOMEM); |
2524 | ||
560928b2 VK |
2525 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2526 | virt_dev->bus = &genpd_bus_type; | |
2527 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2528 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2529 | |
560928b2 | 2530 | ret = device_register(virt_dev); |
3c095f32 | 2531 | if (ret) { |
71b77697 | 2532 | put_device(virt_dev); |
3c095f32 UH |
2533 | return ERR_PTR(ret); |
2534 | } | |
2535 | ||
2536 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2537 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2538 | if (ret < 1) { |
560928b2 | 2539 | device_unregister(virt_dev); |
3c095f32 UH |
2540 | return ret ? ERR_PTR(ret) : NULL; |
2541 | } | |
2542 | ||
560928b2 VK |
2543 | pm_runtime_enable(virt_dev); |
2544 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2545 | |
560928b2 | 2546 | return virt_dev; |
3c095f32 UH |
2547 | } |
2548 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2549 | ||
5d6be70a UH |
2550 | /** |
2551 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2552 | * @dev: The device used to lookup the PM domain. | |
2553 | * @name: The name of the PM domain. | |
2554 | * | |
2555 | * Parse device's OF node to find a PM domain specifier using the | |
2556 | * power-domain-names DT property. For further description see | |
2557 | * genpd_dev_pm_attach_by_id(). | |
2558 | */ | |
7416f1f2 | 2559 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2560 | { |
2561 | int index; | |
2562 | ||
2563 | if (!dev->of_node) | |
2564 | return NULL; | |
2565 | ||
2566 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2567 | name); | |
2568 | if (index < 0) | |
2569 | return NULL; | |
2570 | ||
2571 | return genpd_dev_pm_attach_by_id(dev, index); | |
2572 | } | |
2573 | ||
30f60428 | 2574 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2575 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2576 | { } |
2577 | }; | |
2578 | ||
2579 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2580 | struct device_node *state_node) | |
2581 | { | |
2582 | int err; | |
2583 | u32 residency; | |
2584 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2585 | |
2586 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2587 | &entry_latency); | |
2588 | if (err) { | |
ea11e94b | 2589 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2590 | state_node); |
30f60428 LI |
2591 | return -EINVAL; |
2592 | } | |
2593 | ||
2594 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2595 | &exit_latency); | |
2596 | if (err) { | |
ea11e94b | 2597 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2598 | state_node); |
30f60428 LI |
2599 | return -EINVAL; |
2600 | } | |
2601 | ||
2602 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2603 | if (!err) | |
2604 | genpd_state->residency_ns = 1000 * residency; | |
2605 | ||
2606 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2607 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2608 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2609 | |
2610 | return 0; | |
2611 | } | |
2612 | ||
a3381e3a UH |
2613 | static int genpd_iterate_idle_states(struct device_node *dn, |
2614 | struct genpd_power_state *states) | |
2615 | { | |
2616 | int ret; | |
2617 | struct of_phandle_iterator it; | |
2618 | struct device_node *np; | |
2619 | int i = 0; | |
2620 | ||
2621 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2622 | if (ret <= 0) | |
2623 | return ret; | |
2624 | ||
2625 | /* Loop over the phandles until all the requested entry is found */ | |
2626 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2627 | np = it.node; | |
2628 | if (!of_match_node(idle_state_match, np)) | |
2629 | continue; | |
2630 | if (states) { | |
2631 | ret = genpd_parse_state(&states[i], np); | |
2632 | if (ret) { | |
2633 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2634 | np, ret); | |
2635 | of_node_put(np); | |
2636 | return ret; | |
2637 | } | |
2638 | } | |
2639 | i++; | |
2640 | } | |
2641 | ||
2642 | return i; | |
2643 | } | |
2644 | ||
30f60428 LI |
2645 | /** |
2646 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2647 | * | |
2648 | * @dn: The genpd device node | |
2649 | * @states: The pointer to which the state array will be saved. | |
2650 | * @n: The count of elements in the array returned from this function. | |
2651 | * | |
2652 | * Returns the device states parsed from the OF node. The memory for the states | |
2653 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2654 | * free the memory after use. If any or zero compatible domain idle states is |
2655 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2656 | */ |
2657 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2658 | struct genpd_power_state **states, int *n) | |
2659 | { | |
2660 | struct genpd_power_state *st; | |
a3381e3a | 2661 | int ret; |
30f60428 | 2662 | |
a3381e3a | 2663 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2664 | if (ret < 0) |
2665 | return ret; | |
2666 | ||
2667 | if (!ret) { | |
2668 | *states = NULL; | |
2669 | *n = 0; | |
2670 | return 0; | |
2671 | } | |
30f60428 | 2672 | |
a3381e3a | 2673 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2674 | if (!st) |
2675 | return -ENOMEM; | |
2676 | ||
a3381e3a UH |
2677 | ret = genpd_iterate_idle_states(dn, st); |
2678 | if (ret <= 0) { | |
2679 | kfree(st); | |
2680 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2681 | } |
2682 | ||
a3381e3a UH |
2683 | *states = st; |
2684 | *n = ret; | |
30f60428 LI |
2685 | |
2686 | return 0; | |
2687 | } | |
2688 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2689 | ||
e38f89d3 VK |
2690 | /** |
2691 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2692 | * | |
2693 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2694 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2695 | * state. | |
2696 | * | |
2697 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2698 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2699 | * power domain OPP to performance state. | |
2700 | * | |
2701 | * Returns performance state on success and 0 on failure. | |
2702 | */ | |
2703 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2704 | struct dev_pm_opp *opp) | |
2705 | { | |
2706 | struct generic_pm_domain *genpd = NULL; | |
2707 | int state; | |
2708 | ||
2709 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2710 | ||
2711 | if (unlikely(!genpd->opp_to_performance_state)) | |
2712 | return 0; | |
2713 | ||
2714 | genpd_lock(genpd); | |
2715 | state = genpd->opp_to_performance_state(genpd, opp); | |
2716 | genpd_unlock(genpd); | |
2717 | ||
2718 | return state; | |
2719 | } | |
2720 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2721 | ||
3c095f32 UH |
2722 | static int __init genpd_bus_init(void) |
2723 | { | |
2724 | return bus_register(&genpd_bus_type); | |
2725 | } | |
2726 | core_initcall(genpd_bus_init); | |
2727 | ||
d30d819d | 2728 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2729 | |
2730 | ||
2731 | /*** debugfs support ***/ | |
2732 | ||
8b0510b5 | 2733 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2734 | #include <linux/pm.h> |
2735 | #include <linux/device.h> | |
2736 | #include <linux/debugfs.h> | |
2737 | #include <linux/seq_file.h> | |
2738 | #include <linux/init.h> | |
2739 | #include <linux/kobject.h> | |
9e9704ea | 2740 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2741 | |
2742 | /* | |
2743 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2744 | * from sysfs.c, so generalize it. |
2bd5306a | 2745 | */ |
2bd5306a MM |
2746 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2747 | { | |
2748 | static const char * const status_lookup[] = { | |
2749 | [RPM_ACTIVE] = "active", | |
2750 | [RPM_RESUMING] = "resuming", | |
2751 | [RPM_SUSPENDED] = "suspended", | |
2752 | [RPM_SUSPENDING] = "suspending" | |
2753 | }; | |
2754 | const char *p = ""; | |
2755 | ||
2756 | if (dev->power.runtime_error) | |
2757 | p = "error"; | |
2758 | else if (dev->power.disable_depth) | |
2759 | p = "unsupported"; | |
2760 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2761 | p = status_lookup[dev->power.runtime_status]; | |
2762 | else | |
2763 | WARN_ON(1); | |
2764 | ||
2765 | seq_puts(s, p); | |
2766 | } | |
2bd5306a | 2767 | |
9e9704ea UH |
2768 | static int genpd_summary_one(struct seq_file *s, |
2769 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2770 | { |
2771 | static const char * const status_lookup[] = { | |
2772 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2773 | [GPD_STATE_POWER_OFF] = "off" |
2774 | }; | |
2775 | struct pm_domain_data *pm_data; | |
2776 | const char *kobj_path; | |
2777 | struct gpd_link *link; | |
6954d432 | 2778 | char state[16]; |
2bd5306a MM |
2779 | int ret; |
2780 | ||
35241d12 | 2781 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2782 | if (ret) |
2783 | return -ERESTARTSYS; | |
2784 | ||
66a5ca4b | 2785 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2786 | goto exit; |
41e2c8e0 | 2787 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2788 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2789 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2790 | else |
6954d432 GU |
2791 | snprintf(state, sizeof(state), "%s", |
2792 | status_lookup[genpd->status]); | |
2793 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2794 | |
2795 | /* | |
2796 | * Modifications on the list require holding locks on both | |
2797 | * master and slave, so we are safe. | |
66a5ca4b | 2798 | * Also genpd->name is immutable. |
2bd5306a | 2799 | */ |
66a5ca4b | 2800 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2801 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2802 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2803 | seq_puts(s, ", "); |
2804 | } | |
2805 | ||
66a5ca4b | 2806 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2807 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2808 | genpd_is_irq_safe(genpd) ? | |
2809 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2810 | if (kobj_path == NULL) |
2811 | continue; | |
2812 | ||
2813 | seq_printf(s, "\n %-50s ", kobj_path); | |
2814 | rtpm_status_str(s, pm_data->dev); | |
2815 | kfree(kobj_path); | |
2816 | } | |
2817 | ||
2818 | seq_puts(s, "\n"); | |
2819 | exit: | |
35241d12 | 2820 | genpd_unlock(genpd); |
2bd5306a MM |
2821 | |
2822 | return 0; | |
2823 | } | |
2824 | ||
d32dcc6c | 2825 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 2826 | { |
66a5ca4b | 2827 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2828 | int ret = 0; |
2829 | ||
15dec67a GU |
2830 | seq_puts(s, "domain status slaves\n"); |
2831 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2832 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2833 | ||
2834 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2835 | if (ret) | |
2836 | return -ERESTARTSYS; | |
2837 | ||
66a5ca4b | 2838 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2839 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2840 | if (ret) |
2841 | break; | |
2842 | } | |
2843 | mutex_unlock(&gpd_list_lock); | |
2844 | ||
2845 | return ret; | |
2846 | } | |
2847 | ||
d32dcc6c | 2848 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 2849 | { |
b6a1d093 TG |
2850 | static const char * const status_lookup[] = { |
2851 | [GPD_STATE_ACTIVE] = "on", | |
2852 | [GPD_STATE_POWER_OFF] = "off" | |
2853 | }; | |
2854 | ||
2855 | struct generic_pm_domain *genpd = s->private; | |
2856 | int ret = 0; | |
2857 | ||
2858 | ret = genpd_lock_interruptible(genpd); | |
2859 | if (ret) | |
2860 | return -ERESTARTSYS; | |
2861 | ||
2862 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2863 | goto exit; | |
2864 | ||
2865 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2866 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2867 | genpd->state_idx); | |
2868 | else | |
2869 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2870 | exit: | |
2871 | genpd_unlock(genpd); | |
2872 | return ret; | |
2bd5306a MM |
2873 | } |
2874 | ||
d32dcc6c | 2875 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2876 | { |
2877 | struct generic_pm_domain *genpd = s->private; | |
2878 | struct gpd_link *link; | |
2879 | int ret = 0; | |
2880 | ||
2881 | ret = genpd_lock_interruptible(genpd); | |
2882 | if (ret) | |
2883 | return -ERESTARTSYS; | |
2884 | ||
2885 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2886 | seq_printf(s, "%s\n", link->slave->name); | |
2887 | ||
2888 | genpd_unlock(genpd); | |
2889 | return ret; | |
2890 | } | |
2891 | ||
d32dcc6c | 2892 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2893 | { |
2894 | struct generic_pm_domain *genpd = s->private; | |
2895 | unsigned int i; | |
2896 | int ret = 0; | |
2897 | ||
2898 | ret = genpd_lock_interruptible(genpd); | |
2899 | if (ret) | |
2900 | return -ERESTARTSYS; | |
2901 | ||
2902 | seq_puts(s, "State Time Spent(ms)\n"); | |
2903 | ||
2904 | for (i = 0; i < genpd->state_count; i++) { | |
2905 | ktime_t delta = 0; | |
2906 | s64 msecs; | |
2907 | ||
2908 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2909 | (genpd->state_idx == i)) | |
2910 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2911 | ||
2912 | msecs = ktime_to_ms( | |
2913 | ktime_add(genpd->states[i].idle_time, delta)); | |
2914 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2915 | } | |
2916 | ||
2917 | genpd_unlock(genpd); | |
2918 | return ret; | |
2919 | } | |
2920 | ||
d32dcc6c | 2921 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2922 | { |
2923 | struct generic_pm_domain *genpd = s->private; | |
2924 | ktime_t delta = 0; | |
2925 | int ret = 0; | |
2926 | ||
2927 | ret = genpd_lock_interruptible(genpd); | |
2928 | if (ret) | |
2929 | return -ERESTARTSYS; | |
2930 | ||
2931 | if (genpd->status == GPD_STATE_ACTIVE) | |
2932 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2933 | ||
2934 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2935 | ktime_add(genpd->on_time, delta))); | |
2936 | ||
2937 | genpd_unlock(genpd); | |
2938 | return ret; | |
2939 | } | |
2940 | ||
d32dcc6c | 2941 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2942 | { |
2943 | struct generic_pm_domain *genpd = s->private; | |
2944 | ktime_t delta = 0, total = 0; | |
2945 | unsigned int i; | |
2946 | int ret = 0; | |
2947 | ||
2948 | ret = genpd_lock_interruptible(genpd); | |
2949 | if (ret) | |
2950 | return -ERESTARTSYS; | |
2951 | ||
2952 | for (i = 0; i < genpd->state_count; i++) { | |
2953 | ||
2954 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2955 | (genpd->state_idx == i)) | |
2956 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2957 | ||
2958 | total = ktime_add(total, genpd->states[i].idle_time); | |
2959 | } | |
2960 | total = ktime_add(total, delta); | |
2961 | ||
2962 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2963 | ||
2964 | genpd_unlock(genpd); | |
2965 | return ret; | |
2966 | } | |
2967 | ||
2968 | ||
d32dcc6c | 2969 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2970 | { |
2971 | struct generic_pm_domain *genpd = s->private; | |
2972 | struct pm_domain_data *pm_data; | |
2973 | const char *kobj_path; | |
2974 | int ret = 0; | |
2975 | ||
2976 | ret = genpd_lock_interruptible(genpd); | |
2977 | if (ret) | |
2978 | return -ERESTARTSYS; | |
2979 | ||
2980 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2981 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2982 | genpd_is_irq_safe(genpd) ? | |
2983 | GFP_ATOMIC : GFP_KERNEL); | |
2984 | if (kobj_path == NULL) | |
2985 | continue; | |
2986 | ||
2987 | seq_printf(s, "%s\n", kobj_path); | |
2988 | kfree(kobj_path); | |
2989 | } | |
2990 | ||
2991 | genpd_unlock(genpd); | |
2992 | return ret; | |
2993 | } | |
2994 | ||
d32dcc6c | 2995 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
2996 | { |
2997 | struct generic_pm_domain *genpd = s->private; | |
2998 | ||
2999 | if (genpd_lock_interruptible(genpd)) | |
3000 | return -ERESTARTSYS; | |
3001 | ||
3002 | seq_printf(s, "%u\n", genpd->performance_state); | |
3003 | ||
3004 | genpd_unlock(genpd); | |
3005 | return 0; | |
3006 | } | |
3007 | ||
d32dcc6c YL |
3008 | DEFINE_SHOW_ATTRIBUTE(summary); |
3009 | DEFINE_SHOW_ATTRIBUTE(status); | |
3010 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3011 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3012 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3013 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3014 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3015 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3016 | |
9e9704ea | 3017 | static int __init genpd_debug_init(void) |
2bd5306a MM |
3018 | { |
3019 | struct dentry *d; | |
b6a1d093 | 3020 | struct generic_pm_domain *genpd; |
2bd5306a | 3021 | |
9e9704ea | 3022 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3023 | |
e16a42c3 GKH |
3024 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3025 | NULL, &summary_fops); | |
2bd5306a | 3026 | |
b6a1d093 | 3027 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3028 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
3029 | |
3030 | debugfs_create_file("current_state", 0444, | |
d32dcc6c | 3031 | d, genpd, &status_fops); |
b6a1d093 | 3032 | debugfs_create_file("sub_domains", 0444, |
d32dcc6c | 3033 | d, genpd, &sub_domains_fops); |
b6a1d093 | 3034 | debugfs_create_file("idle_states", 0444, |
d32dcc6c | 3035 | d, genpd, &idle_states_fops); |
b6a1d093 | 3036 | debugfs_create_file("active_time", 0444, |
d32dcc6c | 3037 | d, genpd, &active_time_fops); |
b6a1d093 | 3038 | debugfs_create_file("total_idle_time", 0444, |
d32dcc6c | 3039 | d, genpd, &total_idle_time_fops); |
b6a1d093 | 3040 | debugfs_create_file("devices", 0444, |
d32dcc6c | 3041 | d, genpd, &devices_fops); |
e8912812 RN |
3042 | if (genpd->set_performance_state) |
3043 | debugfs_create_file("perf_state", 0444, | |
d32dcc6c | 3044 | d, genpd, &perf_state_fops); |
b6a1d093 TG |
3045 | } |
3046 | ||
2bd5306a MM |
3047 | return 0; |
3048 | } | |
9e9704ea | 3049 | late_initcall(genpd_debug_init); |
2bd5306a | 3050 | |
9e9704ea | 3051 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3052 | { |
9e9704ea | 3053 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3054 | } |
9e9704ea | 3055 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3056 | #endif /* CONFIG_DEBUG_FS */ |