Commit | Line | Data |
---|---|---|
f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
7a5bd127 JP |
9 | #define pr_fmt(fmt) "PM: " fmt |
10 | ||
93af5e93 | 11 | #include <linux/delay.h> |
f721889f RW |
12 | #include <linux/kernel.h> |
13 | #include <linux/io.h> | |
aa42240a | 14 | #include <linux/platform_device.h> |
6a0ae73d | 15 | #include <linux/pm_opp.h> |
f721889f RW |
16 | #include <linux/pm_runtime.h> |
17 | #include <linux/pm_domain.h> | |
6ff7bb0d | 18 | #include <linux/pm_qos.h> |
c11f6f5b | 19 | #include <linux/pm_clock.h> |
f721889f RW |
20 | #include <linux/slab.h> |
21 | #include <linux/err.h> | |
17b75eca RW |
22 | #include <linux/sched.h> |
23 | #include <linux/suspend.h> | |
d5e4cbfe RW |
24 | #include <linux/export.h> |
25 | ||
aa8e54b5 TV |
26 | #include "power.h" |
27 | ||
93af5e93 GU |
28 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
29 | ||
d5e4cbfe RW |
30 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
31 | ({ \ | |
32 | type (*__routine)(struct device *__d); \ | |
33 | type __ret = (type)0; \ | |
34 | \ | |
35 | __routine = genpd->dev_ops.callback; \ | |
36 | if (__routine) { \ | |
37 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
38 | } \ |
39 | __ret; \ | |
40 | }) | |
f721889f | 41 | |
5125bbf3 RW |
42 | static LIST_HEAD(gpd_list); |
43 | static DEFINE_MUTEX(gpd_list_lock); | |
44 | ||
35241d12 LI |
45 | struct genpd_lock_ops { |
46 | void (*lock)(struct generic_pm_domain *genpd); | |
47 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
48 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
49 | void (*unlock)(struct generic_pm_domain *genpd); | |
50 | }; | |
51 | ||
52 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
53 | { | |
54 | mutex_lock(&genpd->mlock); | |
55 | } | |
56 | ||
57 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
58 | int depth) | |
59 | { | |
60 | mutex_lock_nested(&genpd->mlock, depth); | |
61 | } | |
62 | ||
63 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
64 | { | |
65 | return mutex_lock_interruptible(&genpd->mlock); | |
66 | } | |
67 | ||
68 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
69 | { | |
70 | return mutex_unlock(&genpd->mlock); | |
71 | } | |
72 | ||
73 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
74 | .lock = genpd_lock_mtx, | |
75 | .lock_nested = genpd_lock_nested_mtx, | |
76 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
77 | .unlock = genpd_unlock_mtx, | |
78 | }; | |
79 | ||
d716f479 LI |
80 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
81 | __acquires(&genpd->slock) | |
82 | { | |
83 | unsigned long flags; | |
84 | ||
85 | spin_lock_irqsave(&genpd->slock, flags); | |
86 | genpd->lock_flags = flags; | |
87 | } | |
88 | ||
89 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
90 | int depth) | |
91 | __acquires(&genpd->slock) | |
92 | { | |
93 | unsigned long flags; | |
94 | ||
95 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
96 | genpd->lock_flags = flags; | |
97 | } | |
98 | ||
99 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
100 | __acquires(&genpd->slock) | |
101 | { | |
102 | unsigned long flags; | |
103 | ||
104 | spin_lock_irqsave(&genpd->slock, flags); | |
105 | genpd->lock_flags = flags; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
110 | __releases(&genpd->slock) | |
111 | { | |
112 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
113 | } | |
114 | ||
115 | static const struct genpd_lock_ops genpd_spin_ops = { | |
116 | .lock = genpd_lock_spin, | |
117 | .lock_nested = genpd_lock_nested_spin, | |
118 | .lock_interruptible = genpd_lock_interruptible_spin, | |
119 | .unlock = genpd_unlock_spin, | |
120 | }; | |
121 | ||
35241d12 LI |
122 | #define genpd_lock(p) p->lock_ops->lock(p) |
123 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
124 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
125 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
126 | ||
41e2c8e0 | 127 | #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE) |
d716f479 | 128 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 129 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 130 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
d716f479 LI |
131 | |
132 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 133 | const struct generic_pm_domain *genpd) |
d716f479 LI |
134 | { |
135 | bool ret; | |
136 | ||
137 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
138 | ||
075c37d5 UH |
139 | /* |
140 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
141 | * to indicate a suboptimal configuration for PM. For an always on | |
142 | * domain this isn't case, thus don't warn. | |
143 | */ | |
144 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
145 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
146 | genpd->name); | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
446d999c RK |
151 | /* |
152 | * Get the generic PM domain for a particular struct device. | |
153 | * This validates the struct device pointer, the PM domain pointer, | |
154 | * and checks that the PM domain pointer is a real generic PM domain. | |
155 | * Any failure results in NULL being returned. | |
156 | */ | |
f58d4e5a | 157 | static struct generic_pm_domain *genpd_lookup_dev(struct device *dev) |
446d999c RK |
158 | { |
159 | struct generic_pm_domain *genpd = NULL, *gpd; | |
160 | ||
161 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
162 | return NULL; | |
163 | ||
164 | mutex_lock(&gpd_list_lock); | |
165 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
166 | if (&gpd->domain == dev->pm_domain) { | |
167 | genpd = gpd; | |
168 | break; | |
169 | } | |
170 | } | |
171 | mutex_unlock(&gpd_list_lock); | |
172 | ||
173 | return genpd; | |
174 | } | |
175 | ||
176 | /* | |
177 | * This should only be used where we are certain that the pm_domain | |
178 | * attached to the device is a genpd domain. | |
179 | */ | |
180 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
181 | { |
182 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
183 | return ERR_PTR(-EINVAL); | |
184 | ||
596ba34b | 185 | return pd_to_genpd(dev->pm_domain); |
5248051b | 186 | } |
f721889f | 187 | |
d8600c8b KK |
188 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
189 | struct device *dev) | |
d5e4cbfe | 190 | { |
2b1d88cd | 191 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
192 | } |
193 | ||
d8600c8b KK |
194 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
195 | struct device *dev) | |
d5e4cbfe | 196 | { |
2b1d88cd | 197 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
198 | } |
199 | ||
c4bb3160 | 200 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 201 | { |
c4bb3160 RW |
202 | bool ret = false; |
203 | ||
204 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
205 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
211 | { | |
212 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 213 | smp_mb__after_atomic(); |
f721889f RW |
214 | } |
215 | ||
afece3ab TG |
216 | #ifdef CONFIG_DEBUG_FS |
217 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
218 | { | |
219 | ktime_t delta, now; | |
220 | ||
221 | now = ktime_get(); | |
222 | delta = ktime_sub(now, genpd->accounting_time); | |
223 | ||
224 | /* | |
225 | * If genpd->status is active, it means we are just | |
226 | * out of off and so update the idle time and vice | |
227 | * versa. | |
228 | */ | |
229 | if (genpd->status == GPD_STATE_ACTIVE) { | |
230 | int state_idx = genpd->state_idx; | |
231 | ||
232 | genpd->states[state_idx].idle_time = | |
233 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
234 | } else { | |
235 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
236 | } | |
237 | ||
238 | genpd->accounting_time = now; | |
239 | } | |
240 | #else | |
241 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
242 | #endif | |
243 | ||
cd50c6d3 VK |
244 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
245 | unsigned int state) | |
246 | { | |
247 | struct generic_pm_domain_data *pd_data; | |
248 | struct pm_domain_data *pdd; | |
18edf49c | 249 | struct gpd_link *link; |
cd50c6d3 VK |
250 | |
251 | /* New requested state is same as Max requested state */ | |
252 | if (state == genpd->performance_state) | |
253 | return state; | |
254 | ||
255 | /* New requested state is higher than Max requested state */ | |
256 | if (state > genpd->performance_state) | |
257 | return state; | |
258 | ||
259 | /* Traverse all devices within the domain */ | |
260 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
261 | pd_data = to_gpd_data(pdd); | |
262 | ||
263 | if (pd_data->performance_state > state) | |
264 | state = pd_data->performance_state; | |
265 | } | |
266 | ||
267 | /* | |
18edf49c VK |
268 | * Traverse all sub-domains within the domain. This can be |
269 | * done without any additional locking as the link->performance_state | |
270 | * field is protected by the master genpd->lock, which is already taken. | |
271 | * | |
272 | * Also note that link->performance_state (subdomain's performance state | |
273 | * requirement to master domain) is different from | |
274 | * link->slave->performance_state (current performance state requirement | |
275 | * of the devices/sub-domains of the subdomain) and so can have a | |
276 | * different value. | |
277 | * | |
278 | * Note that we also take vote from powered-off sub-domains into account | |
279 | * as the same is done for devices right now. | |
cd50c6d3 | 280 | */ |
18edf49c VK |
281 | list_for_each_entry(link, &genpd->master_links, master_node) { |
282 | if (link->performance_state > state) | |
283 | state = link->performance_state; | |
284 | } | |
285 | ||
cd50c6d3 VK |
286 | return state; |
287 | } | |
288 | ||
289 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, | |
18edf49c | 290 | unsigned int state, int depth) |
cd50c6d3 | 291 | { |
18edf49c VK |
292 | struct generic_pm_domain *master; |
293 | struct gpd_link *link; | |
294 | int master_state, ret; | |
cd50c6d3 VK |
295 | |
296 | if (state == genpd->performance_state) | |
297 | return 0; | |
298 | ||
18edf49c VK |
299 | /* Propagate to masters of genpd */ |
300 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
301 | master = link->master; | |
302 | ||
303 | if (!master->set_performance_state) | |
304 | continue; | |
305 | ||
306 | /* Find master's performance state */ | |
307 | ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
308 | master->opp_table, | |
309 | state); | |
310 | if (unlikely(ret < 0)) | |
311 | goto err; | |
312 | ||
313 | master_state = ret; | |
314 | ||
315 | genpd_lock_nested(master, depth + 1); | |
316 | ||
317 | link->prev_performance_state = link->performance_state; | |
318 | link->performance_state = master_state; | |
319 | master_state = _genpd_reeval_performance_state(master, | |
320 | master_state); | |
321 | ret = _genpd_set_performance_state(master, master_state, depth + 1); | |
322 | if (ret) | |
323 | link->performance_state = link->prev_performance_state; | |
324 | ||
325 | genpd_unlock(master); | |
326 | ||
327 | if (ret) | |
328 | goto err; | |
329 | } | |
330 | ||
cd50c6d3 VK |
331 | ret = genpd->set_performance_state(genpd, state); |
332 | if (ret) | |
18edf49c | 333 | goto err; |
cd50c6d3 VK |
334 | |
335 | genpd->performance_state = state; | |
336 | return 0; | |
18edf49c VK |
337 | |
338 | err: | |
339 | /* Encountered an error, lets rollback */ | |
340 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, | |
341 | slave_node) { | |
342 | master = link->master; | |
343 | ||
344 | if (!master->set_performance_state) | |
345 | continue; | |
346 | ||
347 | genpd_lock_nested(master, depth + 1); | |
348 | ||
349 | master_state = link->prev_performance_state; | |
350 | link->performance_state = master_state; | |
351 | ||
352 | master_state = _genpd_reeval_performance_state(master, | |
353 | master_state); | |
354 | if (_genpd_set_performance_state(master, master_state, depth + 1)) { | |
355 | pr_err("%s: Failed to roll back to %d performance state\n", | |
356 | master->name, master_state); | |
357 | } | |
358 | ||
359 | genpd_unlock(master); | |
360 | } | |
361 | ||
362 | return ret; | |
cd50c6d3 VK |
363 | } |
364 | ||
42f6284a VK |
365 | /** |
366 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
367 | * domain. | |
368 | * | |
369 | * @dev: Device for which the performance-state needs to be set. | |
370 | * @state: Target performance state of the device. This can be set as 0 when the | |
371 | * device doesn't have any performance state constraints left (And so | |
372 | * the device wouldn't participate anymore to find the target | |
373 | * performance state of the genpd). | |
374 | * | |
375 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
376 | * while this routine is getting called. | |
377 | * | |
378 | * Returns 0 on success and negative error values on failures. | |
379 | */ | |
380 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
381 | { | |
382 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 383 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 384 | unsigned int prev; |
cd50c6d3 | 385 | int ret; |
42f6284a VK |
386 | |
387 | genpd = dev_to_genpd(dev); | |
388 | if (IS_ERR(genpd)) | |
389 | return -ENODEV; | |
390 | ||
391 | if (unlikely(!genpd->set_performance_state)) | |
392 | return -EINVAL; | |
393 | ||
394 | if (unlikely(!dev->power.subsys_data || | |
395 | !dev->power.subsys_data->domain_data)) { | |
396 | WARN_ON(1); | |
397 | return -EINVAL; | |
398 | } | |
399 | ||
400 | genpd_lock(genpd); | |
401 | ||
402 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
403 | prev = gpd_data->performance_state; | |
404 | gpd_data->performance_state = state; | |
405 | ||
cd50c6d3 | 406 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 407 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 408 | if (ret) |
68de2fe5 | 409 | gpd_data->performance_state = prev; |
42f6284a | 410 | |
42f6284a VK |
411 | genpd_unlock(genpd); |
412 | ||
413 | return ret; | |
414 | } | |
415 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
416 | ||
86e12eac | 417 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 418 | { |
fc5cbf0c | 419 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
420 | ktime_t time_start; |
421 | s64 elapsed_ns; | |
422 | int ret; | |
423 | ||
424 | if (!genpd->power_on) | |
425 | return 0; | |
426 | ||
a4630c61 GU |
427 | if (!timed) |
428 | return genpd->power_on(genpd); | |
429 | ||
c8f0ea45 GU |
430 | time_start = ktime_get(); |
431 | ret = genpd->power_on(genpd); | |
432 | if (ret) | |
433 | return ret; | |
434 | ||
435 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 436 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
c8f0ea45 GU |
437 | return ret; |
438 | ||
fc5cbf0c | 439 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 440 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
441 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
442 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
443 | |
444 | return ret; | |
445 | } | |
446 | ||
86e12eac | 447 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 448 | { |
fc5cbf0c | 449 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
450 | ktime_t time_start; |
451 | s64 elapsed_ns; | |
452 | int ret; | |
453 | ||
454 | if (!genpd->power_off) | |
455 | return 0; | |
456 | ||
a4630c61 GU |
457 | if (!timed) |
458 | return genpd->power_off(genpd); | |
459 | ||
c8f0ea45 GU |
460 | time_start = ktime_get(); |
461 | ret = genpd->power_off(genpd); | |
0cec68a9 | 462 | if (ret) |
c8f0ea45 GU |
463 | return ret; |
464 | ||
465 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 466 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
0cec68a9 | 467 | return 0; |
c8f0ea45 | 468 | |
fc5cbf0c | 469 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 470 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
471 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
472 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 473 | |
0cec68a9 | 474 | return 0; |
c8f0ea45 GU |
475 | } |
476 | ||
29e47e21 | 477 | /** |
86e12eac | 478 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 479 | * @genpd: PM domain to power off. |
29e47e21 | 480 | * |
86e12eac | 481 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
482 | * before. |
483 | */ | |
484 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
485 | { | |
486 | queue_work(pm_wq, &genpd->power_off_work); | |
487 | } | |
488 | ||
1f8728b7 UH |
489 | /** |
490 | * genpd_power_off - Remove power from a given PM domain. | |
491 | * @genpd: PM domain to power down. | |
3c64649d UH |
492 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
493 | * RPM status of the releated device is in an intermediate state, not yet turned | |
494 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
495 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
496 | * |
497 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
498 | * have been powered down, remove power from @genpd. | |
499 | */ | |
2da83545 UH |
500 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
501 | unsigned int depth) | |
1f8728b7 UH |
502 | { |
503 | struct pm_domain_data *pdd; | |
504 | struct gpd_link *link; | |
505 | unsigned int not_suspended = 0; | |
506 | ||
507 | /* | |
508 | * Do not try to power off the domain in the following situations: | |
509 | * (1) The domain is already in the "power off" state. | |
510 | * (2) System suspend is in progress. | |
511 | */ | |
41e2c8e0 | 512 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
513 | return 0; |
514 | ||
ffaa42e8 UH |
515 | /* |
516 | * Abort power off for the PM domain in the following situations: | |
517 | * (1) The domain is configured as always on. | |
518 | * (2) When the domain has a subdomain being powered on. | |
519 | */ | |
520 | if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
521 | return -EBUSY; |
522 | ||
523 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
524 | enum pm_qos_flags_status stat; | |
525 | ||
20f97caf | 526 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
527 | if (stat > PM_QOS_FLAGS_NONE) |
528 | return -EBUSY; | |
529 | ||
530 | /* | |
531 | * Do not allow PM domain to be powered off, when an IRQ safe | |
532 | * device is part of a non-IRQ safe domain. | |
533 | */ | |
534 | if (!pm_runtime_suspended(pdd->dev) || | |
535 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
536 | not_suspended++; | |
537 | } | |
538 | ||
3c64649d | 539 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
540 | return -EBUSY; |
541 | ||
542 | if (genpd->gov && genpd->gov->power_down_ok) { | |
543 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
544 | return -EAGAIN; | |
545 | } | |
546 | ||
2c9b7f87 UH |
547 | /* Default to shallowest state. */ |
548 | if (!genpd->gov) | |
549 | genpd->state_idx = 0; | |
550 | ||
1f8728b7 UH |
551 | if (genpd->power_off) { |
552 | int ret; | |
553 | ||
554 | if (atomic_read(&genpd->sd_count) > 0) | |
555 | return -EBUSY; | |
556 | ||
557 | /* | |
558 | * If sd_count > 0 at this point, one of the subdomains hasn't | |
559 | * managed to call genpd_power_on() for the master yet after | |
560 | * incrementing it. In that case genpd_power_on() will wait | |
561 | * for us to drop the lock, so we can call .power_off() and let | |
562 | * the genpd_power_on() restore power for us (this shouldn't | |
563 | * happen very often). | |
564 | */ | |
565 | ret = _genpd_power_off(genpd, true); | |
566 | if (ret) | |
567 | return ret; | |
568 | } | |
569 | ||
570 | genpd->status = GPD_STATE_POWER_OFF; | |
afece3ab | 571 | genpd_update_accounting(genpd); |
1f8728b7 UH |
572 | |
573 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
574 | genpd_sd_counter_dec(link->master); | |
2da83545 UH |
575 | genpd_lock_nested(link->master, depth + 1); |
576 | genpd_power_off(link->master, false, depth + 1); | |
577 | genpd_unlock(link->master); | |
1f8728b7 UH |
578 | } |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
5248051b | 583 | /** |
86e12eac | 584 | * genpd_power_on - Restore power to a given PM domain and its masters. |
5248051b | 585 | * @genpd: PM domain to power up. |
0106ef51 | 586 | * @depth: nesting count for lockdep. |
5248051b | 587 | * |
5063ce15 | 588 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
589 | * resume a device belonging to it. |
590 | */ | |
86e12eac | 591 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 592 | { |
5063ce15 | 593 | struct gpd_link *link; |
5248051b RW |
594 | int ret = 0; |
595 | ||
41e2c8e0 | 596 | if (genpd_status_on(genpd)) |
3f241775 | 597 | return 0; |
5248051b | 598 | |
5063ce15 RW |
599 | /* |
600 | * The list is guaranteed not to change while the loop below is being | |
601 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
602 | * with it. | |
603 | */ | |
604 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
0106ef51 MS |
605 | struct generic_pm_domain *master = link->master; |
606 | ||
607 | genpd_sd_counter_inc(master); | |
608 | ||
35241d12 | 609 | genpd_lock_nested(master, depth + 1); |
86e12eac | 610 | ret = genpd_power_on(master, depth + 1); |
35241d12 | 611 | genpd_unlock(master); |
5248051b | 612 | |
5063ce15 | 613 | if (ret) { |
0106ef51 | 614 | genpd_sd_counter_dec(master); |
9e08cf42 | 615 | goto err; |
5063ce15 | 616 | } |
5248051b RW |
617 | } |
618 | ||
86e12eac | 619 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
620 | if (ret) |
621 | goto err; | |
5248051b | 622 | |
ba2bbfbf | 623 | genpd->status = GPD_STATE_ACTIVE; |
afece3ab TG |
624 | genpd_update_accounting(genpd); |
625 | ||
3f241775 | 626 | return 0; |
9e08cf42 RW |
627 | |
628 | err: | |
29e47e21 UH |
629 | list_for_each_entry_continue_reverse(link, |
630 | &genpd->slave_links, | |
631 | slave_node) { | |
5063ce15 | 632 | genpd_sd_counter_dec(link->master); |
2da83545 UH |
633 | genpd_lock_nested(link->master, depth + 1); |
634 | genpd_power_off(link->master, false, depth + 1); | |
635 | genpd_unlock(link->master); | |
29e47e21 | 636 | } |
9e08cf42 | 637 | |
3f241775 RW |
638 | return ret; |
639 | } | |
640 | ||
6ff7bb0d RW |
641 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
642 | unsigned long val, void *ptr) | |
643 | { | |
644 | struct generic_pm_domain_data *gpd_data; | |
645 | struct device *dev; | |
646 | ||
647 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 648 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
649 | |
650 | for (;;) { | |
651 | struct generic_pm_domain *genpd; | |
652 | struct pm_domain_data *pdd; | |
653 | ||
654 | spin_lock_irq(&dev->power.lock); | |
655 | ||
656 | pdd = dev->power.subsys_data ? | |
657 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 658 | if (pdd) { |
6ff7bb0d RW |
659 | to_gpd_data(pdd)->td.constraint_changed = true; |
660 | genpd = dev_to_genpd(dev); | |
661 | } else { | |
662 | genpd = ERR_PTR(-ENODATA); | |
663 | } | |
664 | ||
665 | spin_unlock_irq(&dev->power.lock); | |
666 | ||
667 | if (!IS_ERR(genpd)) { | |
35241d12 | 668 | genpd_lock(genpd); |
6ff7bb0d | 669 | genpd->max_off_time_changed = true; |
35241d12 | 670 | genpd_unlock(genpd); |
6ff7bb0d RW |
671 | } |
672 | ||
673 | dev = dev->parent; | |
674 | if (!dev || dev->power.ignore_children) | |
675 | break; | |
676 | } | |
677 | ||
678 | return NOTIFY_DONE; | |
679 | } | |
680 | ||
f721889f RW |
681 | /** |
682 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
683 | * @work: Work structure used for scheduling the execution of this function. | |
684 | */ | |
685 | static void genpd_power_off_work_fn(struct work_struct *work) | |
686 | { | |
687 | struct generic_pm_domain *genpd; | |
688 | ||
689 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
690 | ||
35241d12 | 691 | genpd_lock(genpd); |
2da83545 | 692 | genpd_power_off(genpd, false, 0); |
35241d12 | 693 | genpd_unlock(genpd); |
f721889f RW |
694 | } |
695 | ||
54eeddbf UH |
696 | /** |
697 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
698 | * @dev: Device to handle. | |
699 | */ | |
700 | static int __genpd_runtime_suspend(struct device *dev) | |
701 | { | |
702 | int (*cb)(struct device *__dev); | |
703 | ||
704 | if (dev->type && dev->type->pm) | |
705 | cb = dev->type->pm->runtime_suspend; | |
706 | else if (dev->class && dev->class->pm) | |
707 | cb = dev->class->pm->runtime_suspend; | |
708 | else if (dev->bus && dev->bus->pm) | |
709 | cb = dev->bus->pm->runtime_suspend; | |
710 | else | |
711 | cb = NULL; | |
712 | ||
713 | if (!cb && dev->driver && dev->driver->pm) | |
714 | cb = dev->driver->pm->runtime_suspend; | |
715 | ||
716 | return cb ? cb(dev) : 0; | |
717 | } | |
718 | ||
719 | /** | |
720 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
721 | * @dev: Device to handle. | |
722 | */ | |
723 | static int __genpd_runtime_resume(struct device *dev) | |
724 | { | |
725 | int (*cb)(struct device *__dev); | |
726 | ||
727 | if (dev->type && dev->type->pm) | |
728 | cb = dev->type->pm->runtime_resume; | |
729 | else if (dev->class && dev->class->pm) | |
730 | cb = dev->class->pm->runtime_resume; | |
731 | else if (dev->bus && dev->bus->pm) | |
732 | cb = dev->bus->pm->runtime_resume; | |
733 | else | |
734 | cb = NULL; | |
735 | ||
736 | if (!cb && dev->driver && dev->driver->pm) | |
737 | cb = dev->driver->pm->runtime_resume; | |
738 | ||
739 | return cb ? cb(dev) : 0; | |
740 | } | |
741 | ||
f721889f | 742 | /** |
795bd2e7 | 743 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
744 | * @dev: Device to suspend. |
745 | * | |
746 | * Carry out a runtime suspend of a device under the assumption that its | |
747 | * pm_domain field points to the domain member of an object of type | |
748 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
749 | */ | |
795bd2e7 | 750 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
751 | { |
752 | struct generic_pm_domain *genpd; | |
9df3921e | 753 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 754 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 755 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
756 | ktime_t time_start; |
757 | s64 elapsed_ns; | |
d5e4cbfe | 758 | int ret; |
f721889f RW |
759 | |
760 | dev_dbg(dev, "%s()\n", __func__); | |
761 | ||
5248051b RW |
762 | genpd = dev_to_genpd(dev); |
763 | if (IS_ERR(genpd)) | |
f721889f RW |
764 | return -EINVAL; |
765 | ||
ffe12855 UH |
766 | /* |
767 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
768 | * callbacks for other purposes than runtime PM. In those scenarios | |
769 | * runtime PM is disabled. Under these circumstances, we shall skip | |
770 | * validating/measuring the PM QoS latency. | |
771 | */ | |
9df3921e UH |
772 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
773 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
774 | return -EBUSY; |
775 | ||
2b1d88cd | 776 | /* Measure suspend latency. */ |
d33d5a6c | 777 | time_start = 0; |
ffe12855 UH |
778 | if (runtime_pm) |
779 | time_start = ktime_get(); | |
2b1d88cd | 780 | |
54eeddbf | 781 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
782 | if (ret) |
783 | return ret; | |
17b75eca | 784 | |
2b1d88cd | 785 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 786 | if (ret) { |
54eeddbf | 787 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
788 | return ret; |
789 | } | |
790 | ||
2b1d88cd | 791 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
792 | if (runtime_pm) { |
793 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
794 | if (elapsed_ns > td->suspend_latency_ns) { | |
795 | td->suspend_latency_ns = elapsed_ns; | |
796 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
797 | elapsed_ns); | |
798 | genpd->max_off_time_changed = true; | |
799 | td->constraint_changed = true; | |
800 | } | |
2b1d88cd UH |
801 | } |
802 | ||
0aa2a221 | 803 | /* |
d716f479 LI |
804 | * If power.irq_safe is set, this routine may be run with |
805 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 806 | */ |
d716f479 | 807 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
808 | return 0; |
809 | ||
35241d12 | 810 | genpd_lock(genpd); |
2da83545 | 811 | genpd_power_off(genpd, true, 0); |
35241d12 | 812 | genpd_unlock(genpd); |
f721889f RW |
813 | |
814 | return 0; | |
815 | } | |
816 | ||
f721889f | 817 | /** |
795bd2e7 | 818 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
819 | * @dev: Device to resume. |
820 | * | |
821 | * Carry out a runtime resume of a device under the assumption that its | |
822 | * pm_domain field points to the domain member of an object of type | |
823 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
824 | */ | |
795bd2e7 | 825 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
826 | { |
827 | struct generic_pm_domain *genpd; | |
2b1d88cd | 828 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 829 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
830 | ktime_t time_start; |
831 | s64 elapsed_ns; | |
f721889f | 832 | int ret; |
ba2bbfbf | 833 | bool timed = true; |
f721889f RW |
834 | |
835 | dev_dbg(dev, "%s()\n", __func__); | |
836 | ||
5248051b RW |
837 | genpd = dev_to_genpd(dev); |
838 | if (IS_ERR(genpd)) | |
f721889f RW |
839 | return -EINVAL; |
840 | ||
d716f479 LI |
841 | /* |
842 | * As we don't power off a non IRQ safe domain, which holds | |
843 | * an IRQ safe device, we don't need to restore power to it. | |
844 | */ | |
845 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
846 | timed = false; |
847 | goto out; | |
848 | } | |
0aa2a221 | 849 | |
35241d12 | 850 | genpd_lock(genpd); |
86e12eac | 851 | ret = genpd_power_on(genpd, 0); |
35241d12 | 852 | genpd_unlock(genpd); |
c6d22b37 | 853 | |
ba2bbfbf UH |
854 | if (ret) |
855 | return ret; | |
c6d22b37 | 856 | |
ba2bbfbf | 857 | out: |
2b1d88cd | 858 | /* Measure resume latency. */ |
ab51e6ba | 859 | time_start = 0; |
ffe12855 | 860 | if (timed && runtime_pm) |
2b1d88cd UH |
861 | time_start = ktime_get(); |
862 | ||
076395ca LP |
863 | ret = genpd_start_dev(genpd, dev); |
864 | if (ret) | |
865 | goto err_poweroff; | |
866 | ||
54eeddbf | 867 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
868 | if (ret) |
869 | goto err_stop; | |
2b1d88cd UH |
870 | |
871 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 872 | if (timed && runtime_pm) { |
2b1d88cd UH |
873 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
874 | if (elapsed_ns > td->resume_latency_ns) { | |
875 | td->resume_latency_ns = elapsed_ns; | |
876 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
877 | elapsed_ns); | |
878 | genpd->max_off_time_changed = true; | |
879 | td->constraint_changed = true; | |
880 | } | |
881 | } | |
17b75eca | 882 | |
f721889f | 883 | return 0; |
076395ca LP |
884 | |
885 | err_stop: | |
886 | genpd_stop_dev(genpd, dev); | |
887 | err_poweroff: | |
d716f479 LI |
888 | if (!pm_runtime_is_irq_safe(dev) || |
889 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 890 | genpd_lock(genpd); |
2da83545 | 891 | genpd_power_off(genpd, true, 0); |
35241d12 | 892 | genpd_unlock(genpd); |
076395ca LP |
893 | } |
894 | ||
895 | return ret; | |
f721889f RW |
896 | } |
897 | ||
39ac5ba5 TB |
898 | static bool pd_ignore_unused; |
899 | static int __init pd_ignore_unused_setup(char *__unused) | |
900 | { | |
901 | pd_ignore_unused = true; | |
902 | return 1; | |
903 | } | |
904 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
905 | ||
17f2ae7f | 906 | /** |
86e12eac | 907 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 908 | */ |
86e12eac | 909 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
910 | { |
911 | struct generic_pm_domain *genpd; | |
912 | ||
39ac5ba5 TB |
913 | if (pd_ignore_unused) { |
914 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 915 | return 0; |
39ac5ba5 TB |
916 | } |
917 | ||
17f2ae7f RW |
918 | mutex_lock(&gpd_list_lock); |
919 | ||
920 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
921 | genpd_queue_power_off_work(genpd); | |
922 | ||
923 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 924 | |
2fe71dcd UH |
925 | return 0; |
926 | } | |
86e12eac | 927 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 928 | |
0159ec67 | 929 | #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF) |
596ba34b | 930 | |
9e9704ea | 931 | static bool genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 932 | { |
895b31f3 | 933 | const struct generic_pm_domain *gpd; |
77f827de RW |
934 | |
935 | if (IS_ERR_OR_NULL(genpd)) | |
936 | return false; | |
937 | ||
938 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
939 | if (gpd == genpd) | |
940 | return true; | |
941 | ||
942 | return false; | |
943 | } | |
944 | ||
0159ec67 JH |
945 | #endif |
946 | ||
947 | #ifdef CONFIG_PM_SLEEP | |
948 | ||
596ba34b | 949 | /** |
86e12eac | 950 | * genpd_sync_power_off - Synchronously power off a PM domain and its masters. |
596ba34b | 951 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
952 | * @use_lock: use the lock. |
953 | * @depth: nesting count for lockdep. | |
596ba34b RW |
954 | * |
955 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 956 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 957 | * |
77f827de | 958 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
959 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
960 | * these cases the lock must be held. | |
596ba34b | 961 | */ |
0883ac03 UH |
962 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
963 | unsigned int depth) | |
596ba34b | 964 | { |
5063ce15 | 965 | struct gpd_link *link; |
596ba34b | 966 | |
ffaa42e8 | 967 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
968 | return; |
969 | ||
c4bb3160 RW |
970 | if (genpd->suspended_count != genpd->device_count |
971 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
972 | return; |
973 | ||
fc5cbf0c AH |
974 | /* Choose the deepest state when suspending */ |
975 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
976 | if (_genpd_power_off(genpd, false)) |
977 | return; | |
596ba34b | 978 | |
17b75eca | 979 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
980 | |
981 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
982 | genpd_sd_counter_dec(link->master); | |
0883ac03 UH |
983 | |
984 | if (use_lock) | |
985 | genpd_lock_nested(link->master, depth + 1); | |
986 | ||
987 | genpd_sync_power_off(link->master, use_lock, depth + 1); | |
988 | ||
989 | if (use_lock) | |
990 | genpd_unlock(link->master); | |
596ba34b RW |
991 | } |
992 | } | |
993 | ||
802d8b49 | 994 | /** |
86e12eac | 995 | * genpd_sync_power_on - Synchronously power on a PM domain and its masters. |
802d8b49 | 996 | * @genpd: PM domain to power on. |
0883ac03 UH |
997 | * @use_lock: use the lock. |
998 | * @depth: nesting count for lockdep. | |
802d8b49 | 999 | * |
77f827de | 1000 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1001 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1002 | * these cases the lock must be held. | |
802d8b49 | 1003 | */ |
0883ac03 UH |
1004 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1005 | unsigned int depth) | |
802d8b49 RW |
1006 | { |
1007 | struct gpd_link *link; | |
1008 | ||
41e2c8e0 | 1009 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1010 | return; |
1011 | ||
1012 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
802d8b49 | 1013 | genpd_sd_counter_inc(link->master); |
0883ac03 UH |
1014 | |
1015 | if (use_lock) | |
1016 | genpd_lock_nested(link->master, depth + 1); | |
1017 | ||
1018 | genpd_sync_power_on(link->master, use_lock, depth + 1); | |
1019 | ||
1020 | if (use_lock) | |
1021 | genpd_unlock(link->master); | |
802d8b49 RW |
1022 | } |
1023 | ||
86e12eac | 1024 | _genpd_power_on(genpd, false); |
802d8b49 RW |
1025 | |
1026 | genpd->status = GPD_STATE_ACTIVE; | |
1027 | } | |
1028 | ||
4ecd6e65 RW |
1029 | /** |
1030 | * resume_needed - Check whether to resume a device before system suspend. | |
1031 | * @dev: Device to check. | |
1032 | * @genpd: PM domain the device belongs to. | |
1033 | * | |
1034 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1035 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1036 | * to wake up the system and it has to remain active for this purpose while the |
1037 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1038 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1039 | * by itself (those signals are generated on its behalf by other parts of the | |
1040 | * system). In the latter case it may be necessary to reconfigure the device's | |
1041 | * wakeup settings during system suspend, because it may have been set up to | |
1042 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1043 | * Return 'true' in either of the above cases. | |
1044 | */ | |
d8600c8b KK |
1045 | static bool resume_needed(struct device *dev, |
1046 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1047 | { |
1048 | bool active_wakeup; | |
1049 | ||
1050 | if (!device_can_wakeup(dev)) | |
1051 | return false; | |
1052 | ||
d0af45f1 | 1053 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1054 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1055 | } | |
1056 | ||
596ba34b | 1057 | /** |
9e9704ea | 1058 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1059 | * @dev: Device to start the transition of. |
1060 | * | |
1061 | * Start a power transition of a device (during a system-wide power transition) | |
1062 | * under the assumption that its pm_domain field points to the domain member of | |
1063 | * an object of type struct generic_pm_domain representing a PM domain | |
1064 | * consisting of I/O devices. | |
1065 | */ | |
9e9704ea | 1066 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1067 | { |
1068 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1069 | int ret; |
596ba34b RW |
1070 | |
1071 | dev_dbg(dev, "%s()\n", __func__); | |
1072 | ||
1073 | genpd = dev_to_genpd(dev); | |
1074 | if (IS_ERR(genpd)) | |
1075 | return -EINVAL; | |
1076 | ||
17b75eca RW |
1077 | /* |
1078 | * If a wakeup request is pending for the device, it should be woken up | |
1079 | * at this point and a system wakeup event should be reported if it's | |
1080 | * set up to wake up the system from sleep states. | |
1081 | */ | |
4ecd6e65 RW |
1082 | if (resume_needed(dev, genpd)) |
1083 | pm_runtime_resume(dev); | |
1084 | ||
35241d12 | 1085 | genpd_lock(genpd); |
596ba34b | 1086 | |
39dd0f23 | 1087 | if (genpd->prepared_count++ == 0) |
65533bbf | 1088 | genpd->suspended_count = 0; |
17b75eca | 1089 | |
35241d12 | 1090 | genpd_unlock(genpd); |
596ba34b | 1091 | |
b6c10c84 | 1092 | ret = pm_generic_prepare(dev); |
5241ab40 | 1093 | if (ret < 0) { |
35241d12 | 1094 | genpd_lock(genpd); |
b6c10c84 | 1095 | |
39dd0f23 | 1096 | genpd->prepared_count--; |
b6c10c84 | 1097 | |
35241d12 | 1098 | genpd_unlock(genpd); |
b6c10c84 | 1099 | } |
17b75eca | 1100 | |
5241ab40 UH |
1101 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1102 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1103 | } |
1104 | ||
0496c8ae | 1105 | /** |
10da6542 MP |
1106 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1107 | * I/O pm domain. | |
0496c8ae | 1108 | * @dev: Device to suspend. |
10da6542 | 1109 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1110 | * |
1111 | * Stop the device and remove power from the domain if all devices in it have | |
1112 | * been stopped. | |
1113 | */ | |
10da6542 | 1114 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1115 | { |
1116 | struct generic_pm_domain *genpd; | |
a935424b | 1117 | int ret = 0; |
0496c8ae | 1118 | |
0496c8ae RW |
1119 | genpd = dev_to_genpd(dev); |
1120 | if (IS_ERR(genpd)) | |
1121 | return -EINVAL; | |
596ba34b | 1122 | |
10da6542 MP |
1123 | if (poweroff) |
1124 | ret = pm_generic_poweroff_noirq(dev); | |
1125 | else | |
1126 | ret = pm_generic_suspend_noirq(dev); | |
1127 | if (ret) | |
1128 | return ret; | |
1129 | ||
a935424b UH |
1130 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1131 | return 0; | |
1132 | ||
17218e00 RW |
1133 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1134 | !pm_runtime_status_suspended(dev)) { | |
1135 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1136 | if (ret) { |
1137 | if (poweroff) | |
1138 | pm_generic_restore_noirq(dev); | |
1139 | else | |
1140 | pm_generic_resume_noirq(dev); | |
122a2237 | 1141 | return ret; |
a935424b | 1142 | } |
122a2237 UH |
1143 | } |
1144 | ||
0883ac03 | 1145 | genpd_lock(genpd); |
596ba34b | 1146 | genpd->suspended_count++; |
0883ac03 UH |
1147 | genpd_sync_power_off(genpd, true, 0); |
1148 | genpd_unlock(genpd); | |
596ba34b RW |
1149 | |
1150 | return 0; | |
1151 | } | |
1152 | ||
10da6542 | 1153 | /** |
9e9704ea | 1154 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1155 | * @dev: Device to suspend. |
1156 | * | |
1157 | * Stop the device and remove power from the domain if all devices in it have | |
1158 | * been stopped. | |
1159 | */ | |
9e9704ea | 1160 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1161 | { |
1162 | dev_dbg(dev, "%s()\n", __func__); | |
1163 | ||
1164 | return genpd_finish_suspend(dev, false); | |
1165 | } | |
1166 | ||
596ba34b | 1167 | /** |
9e9704ea | 1168 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1169 | * @dev: Device to resume. |
1170 | * | |
0496c8ae | 1171 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1172 | */ |
9e9704ea | 1173 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1174 | { |
1175 | struct generic_pm_domain *genpd; | |
a935424b | 1176 | int ret; |
596ba34b RW |
1177 | |
1178 | dev_dbg(dev, "%s()\n", __func__); | |
1179 | ||
1180 | genpd = dev_to_genpd(dev); | |
1181 | if (IS_ERR(genpd)) | |
1182 | return -EINVAL; | |
1183 | ||
d0af45f1 | 1184 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1185 | return pm_generic_resume_noirq(dev); |
596ba34b | 1186 | |
0883ac03 UH |
1187 | genpd_lock(genpd); |
1188 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1189 | genpd->suspended_count--; |
0883ac03 | 1190 | genpd_unlock(genpd); |
596ba34b | 1191 | |
17218e00 RW |
1192 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1193 | !pm_runtime_status_suspended(dev)) { | |
1194 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1195 | if (ret) |
1196 | return ret; | |
1197 | } | |
122a2237 | 1198 | |
a935424b | 1199 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1200 | } |
1201 | ||
0496c8ae | 1202 | /** |
9e9704ea | 1203 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1204 | * @dev: Device to freeze. |
1205 | * | |
1206 | * Carry out a late freeze of a device under the assumption that its | |
1207 | * pm_domain field points to the domain member of an object of type | |
1208 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1209 | * devices. | |
1210 | */ | |
9e9704ea | 1211 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1212 | { |
d8600c8b | 1213 | const struct generic_pm_domain *genpd; |
122a2237 | 1214 | int ret = 0; |
596ba34b RW |
1215 | |
1216 | dev_dbg(dev, "%s()\n", __func__); | |
1217 | ||
1218 | genpd = dev_to_genpd(dev); | |
1219 | if (IS_ERR(genpd)) | |
1220 | return -EINVAL; | |
1221 | ||
10da6542 MP |
1222 | ret = pm_generic_freeze_noirq(dev); |
1223 | if (ret) | |
1224 | return ret; | |
1225 | ||
17218e00 RW |
1226 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1227 | !pm_runtime_status_suspended(dev)) | |
1228 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1229 | |
1230 | return ret; | |
0496c8ae | 1231 | } |
596ba34b | 1232 | |
0496c8ae | 1233 | /** |
9e9704ea | 1234 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1235 | * @dev: Device to thaw. |
1236 | * | |
1237 | * Start the device, unless power has been removed from the domain already | |
1238 | * before the system transition. | |
1239 | */ | |
9e9704ea | 1240 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1241 | { |
d8600c8b | 1242 | const struct generic_pm_domain *genpd; |
122a2237 | 1243 | int ret = 0; |
596ba34b | 1244 | |
0496c8ae | 1245 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1246 | |
0496c8ae RW |
1247 | genpd = dev_to_genpd(dev); |
1248 | if (IS_ERR(genpd)) | |
1249 | return -EINVAL; | |
1250 | ||
17218e00 RW |
1251 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1252 | !pm_runtime_status_suspended(dev)) { | |
1253 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1254 | if (ret) |
1255 | return ret; | |
1256 | } | |
122a2237 | 1257 | |
10da6542 MP |
1258 | return pm_generic_thaw_noirq(dev); |
1259 | } | |
1260 | ||
1261 | /** | |
9e9704ea | 1262 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1263 | * I/O PM domain. |
1264 | * @dev: Device to poweroff. | |
1265 | * | |
1266 | * Stop the device and remove power from the domain if all devices in it have | |
1267 | * been stopped. | |
1268 | */ | |
9e9704ea | 1269 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1270 | { |
1271 | dev_dbg(dev, "%s()\n", __func__); | |
1272 | ||
1273 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1274 | } |
1275 | ||
596ba34b | 1276 | /** |
9e9704ea | 1277 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1278 | * @dev: Device to resume. |
1279 | * | |
0496c8ae RW |
1280 | * Make sure the domain will be in the same power state as before the |
1281 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1282 | */ |
9e9704ea | 1283 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1284 | { |
1285 | struct generic_pm_domain *genpd; | |
122a2237 | 1286 | int ret = 0; |
596ba34b RW |
1287 | |
1288 | dev_dbg(dev, "%s()\n", __func__); | |
1289 | ||
1290 | genpd = dev_to_genpd(dev); | |
1291 | if (IS_ERR(genpd)) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | /* | |
65533bbf RW |
1295 | * At this point suspended_count == 0 means we are being run for the |
1296 | * first time for the given domain in the present cycle. | |
596ba34b | 1297 | */ |
0883ac03 | 1298 | genpd_lock(genpd); |
39dd0f23 | 1299 | if (genpd->suspended_count++ == 0) |
596ba34b | 1300 | /* |
65533bbf | 1301 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1302 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1303 | * so that it tries to power it on in case it was really off. |
596ba34b | 1304 | */ |
65533bbf | 1305 | genpd->status = GPD_STATE_POWER_OFF; |
18dd2ece | 1306 | |
0883ac03 UH |
1307 | genpd_sync_power_on(genpd, true, 0); |
1308 | genpd_unlock(genpd); | |
596ba34b | 1309 | |
17218e00 RW |
1310 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1311 | !pm_runtime_status_suspended(dev)) { | |
1312 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1313 | if (ret) |
1314 | return ret; | |
1315 | } | |
122a2237 | 1316 | |
10da6542 | 1317 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1318 | } |
1319 | ||
1320 | /** | |
9e9704ea | 1321 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1322 | * @dev: Device to complete the transition of. |
1323 | * | |
1324 | * Complete a power transition of a device (during a system-wide power | |
1325 | * transition) under the assumption that its pm_domain field points to the | |
1326 | * domain member of an object of type struct generic_pm_domain representing | |
1327 | * a power domain consisting of I/O devices. | |
1328 | */ | |
9e9704ea | 1329 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1330 | { |
1331 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1332 | |
1333 | dev_dbg(dev, "%s()\n", __func__); | |
1334 | ||
1335 | genpd = dev_to_genpd(dev); | |
1336 | if (IS_ERR(genpd)) | |
1337 | return; | |
1338 | ||
4d23a5e8 UH |
1339 | pm_generic_complete(dev); |
1340 | ||
35241d12 | 1341 | genpd_lock(genpd); |
596ba34b | 1342 | |
39dd0f23 | 1343 | genpd->prepared_count--; |
4d23a5e8 UH |
1344 | if (!genpd->prepared_count) |
1345 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1346 | |
35241d12 | 1347 | genpd_unlock(genpd); |
596ba34b RW |
1348 | } |
1349 | ||
77f827de | 1350 | /** |
d47e6464 | 1351 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1352 | * @dev: Device that normally is marked as "always on" to switch power for. |
1353 | * | |
1354 | * This routine may only be called during the system core (syscore) suspend or | |
1355 | * resume phase for devices whose "always on" flags are set. | |
1356 | */ | |
d47e6464 | 1357 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1358 | { |
1359 | struct generic_pm_domain *genpd; | |
1360 | ||
23c6d2c7 | 1361 | genpd = dev_to_genpd(dev); |
9e9704ea | 1362 | if (!genpd_present(genpd)) |
77f827de RW |
1363 | return; |
1364 | ||
1365 | if (suspend) { | |
1366 | genpd->suspended_count++; | |
0883ac03 | 1367 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1368 | } else { |
0883ac03 | 1369 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1370 | genpd->suspended_count--; |
1371 | } | |
1372 | } | |
d47e6464 UH |
1373 | |
1374 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1375 | { | |
1376 | genpd_syscore_switch(dev, true); | |
1377 | } | |
1378 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1379 | ||
1380 | void pm_genpd_syscore_poweron(struct device *dev) | |
1381 | { | |
1382 | genpd_syscore_switch(dev, false); | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1385 | |
d30d819d | 1386 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1387 | |
9e9704ea UH |
1388 | #define genpd_prepare NULL |
1389 | #define genpd_suspend_noirq NULL | |
1390 | #define genpd_resume_noirq NULL | |
1391 | #define genpd_freeze_noirq NULL | |
1392 | #define genpd_thaw_noirq NULL | |
1393 | #define genpd_poweroff_noirq NULL | |
1394 | #define genpd_restore_noirq NULL | |
1395 | #define genpd_complete NULL | |
596ba34b RW |
1396 | |
1397 | #endif /* CONFIG_PM_SLEEP */ | |
1398 | ||
f104e1e5 | 1399 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
f104e1e5 | 1400 | struct gpd_timing_data *td) |
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 UH |
1415 | if (td) |
1416 | gpd_data->td = *td; | |
1417 | ||
1418 | gpd_data->base.dev = dev; | |
f104e1e5 | 1419 | gpd_data->td.constraint_changed = true; |
0759e80b | 1420 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1421 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1422 | ||
1423 | spin_lock_irq(&dev->power.lock); | |
1424 | ||
1425 | if (dev->power.subsys_data->domain_data) { | |
1426 | ret = -EINVAL; | |
1427 | goto err_free; | |
1428 | } | |
1429 | ||
1430 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1431 | |
1432 | spin_unlock_irq(&dev->power.lock); | |
1433 | ||
1d5fcfec | 1434 | return gpd_data; |
3e235685 | 1435 | |
f104e1e5 UH |
1436 | err_free: |
1437 | spin_unlock_irq(&dev->power.lock); | |
1438 | kfree(gpd_data); | |
3e235685 UH |
1439 | err_put: |
1440 | dev_pm_put_subsys_data(dev); | |
1441 | return ERR_PTR(ret); | |
1d5fcfec RW |
1442 | } |
1443 | ||
49d400c7 UH |
1444 | static void genpd_free_dev_data(struct device *dev, |
1445 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1446 | { |
f104e1e5 UH |
1447 | spin_lock_irq(&dev->power.lock); |
1448 | ||
f104e1e5 UH |
1449 | dev->power.subsys_data->domain_data = NULL; |
1450 | ||
1451 | spin_unlock_irq(&dev->power.lock); | |
1452 | ||
1d5fcfec | 1453 | kfree(gpd_data); |
3e235685 | 1454 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1455 | } |
1456 | ||
19efa5ff JH |
1457 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1458 | struct gpd_timing_data *td) | |
f721889f | 1459 | { |
c0356db7 | 1460 | struct generic_pm_domain_data *gpd_data; |
b56d9c91 | 1461 | int ret; |
f721889f RW |
1462 | |
1463 | dev_dbg(dev, "%s()\n", __func__); | |
1464 | ||
1465 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1466 | return -EINVAL; | |
1467 | ||
96c1bf68 | 1468 | gpd_data = genpd_alloc_dev_data(dev, td); |
3e235685 UH |
1469 | if (IS_ERR(gpd_data)) |
1470 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1471 | |
b472c2fa UH |
1472 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1473 | if (ret) | |
1474 | goto out; | |
d79b6fe1 | 1475 | |
2071ac98 JW |
1476 | genpd_lock(genpd); |
1477 | ||
975e83cf SH |
1478 | dev_pm_domain_set(dev, &genpd->domain); |
1479 | ||
14b53064 UH |
1480 | genpd->device_count++; |
1481 | genpd->max_off_time_changed = true; | |
1482 | ||
1d5fcfec | 1483 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1484 | |
35241d12 | 1485 | genpd_unlock(genpd); |
2071ac98 | 1486 | out: |
c0356db7 UH |
1487 | if (ret) |
1488 | genpd_free_dev_data(dev, gpd_data); | |
1489 | else | |
1490 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1491 | |
f721889f RW |
1492 | return ret; |
1493 | } | |
19efa5ff JH |
1494 | |
1495 | /** | |
1a7a6707 | 1496 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1497 | * @genpd: PM domain to add the device to. |
1498 | * @dev: Device to be added. | |
19efa5ff | 1499 | */ |
1a7a6707 | 1500 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1501 | { |
1502 | int ret; | |
1503 | ||
1504 | mutex_lock(&gpd_list_lock); | |
1a7a6707 | 1505 | ret = genpd_add_device(genpd, dev, NULL); |
19efa5ff JH |
1506 | mutex_unlock(&gpd_list_lock); |
1507 | ||
1508 | return ret; | |
1509 | } | |
1a7a6707 | 1510 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1511 | |
85168d56 UH |
1512 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1513 | struct device *dev) | |
f721889f | 1514 | { |
6ff7bb0d | 1515 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1516 | struct pm_domain_data *pdd; |
efa69025 | 1517 | int ret = 0; |
f721889f RW |
1518 | |
1519 | dev_dbg(dev, "%s()\n", __func__); | |
1520 | ||
c0356db7 UH |
1521 | pdd = dev->power.subsys_data->domain_data; |
1522 | gpd_data = to_gpd_data(pdd); | |
1523 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1524 | ||
35241d12 | 1525 | genpd_lock(genpd); |
f721889f | 1526 | |
596ba34b RW |
1527 | if (genpd->prepared_count > 0) { |
1528 | ret = -EAGAIN; | |
1529 | goto out; | |
1530 | } | |
1531 | ||
6ff7bb0d RW |
1532 | genpd->device_count--; |
1533 | genpd->max_off_time_changed = true; | |
1534 | ||
975e83cf SH |
1535 | dev_pm_domain_set(dev, NULL); |
1536 | ||
efa69025 | 1537 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1538 | |
35241d12 | 1539 | genpd_unlock(genpd); |
6ff7bb0d | 1540 | |
2071ac98 JW |
1541 | if (genpd->detach_dev) |
1542 | genpd->detach_dev(genpd, dev); | |
1543 | ||
c1dbe2fb | 1544 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1545 | |
6ff7bb0d | 1546 | return 0; |
f721889f | 1547 | |
596ba34b | 1548 | out: |
35241d12 | 1549 | genpd_unlock(genpd); |
c0356db7 | 1550 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1551 | |
1552 | return ret; | |
1553 | } | |
85168d56 UH |
1554 | |
1555 | /** | |
1556 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1557 | * @dev: Device to be removed. |
1558 | */ | |
924f4486 | 1559 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1560 | { |
924f4486 UH |
1561 | struct generic_pm_domain *genpd = genpd_lookup_dev(dev); |
1562 | ||
1563 | if (!genpd) | |
85168d56 UH |
1564 | return -EINVAL; |
1565 | ||
1566 | return genpd_remove_device(genpd, dev); | |
1567 | } | |
24c96dc7 | 1568 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1569 | |
19efa5ff JH |
1570 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1571 | struct generic_pm_domain *subdomain) | |
f721889f | 1572 | { |
2547923d | 1573 | struct gpd_link *link, *itr; |
f721889f RW |
1574 | int ret = 0; |
1575 | ||
fb7268be RW |
1576 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1577 | || genpd == subdomain) | |
f721889f RW |
1578 | return -EINVAL; |
1579 | ||
d716f479 LI |
1580 | /* |
1581 | * If the domain can be powered on/off in an IRQ safe | |
1582 | * context, ensure that the subdomain can also be | |
1583 | * powered on/off in that context. | |
1584 | */ | |
1585 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1586 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1587 | genpd->name, subdomain->name); |
1588 | return -EINVAL; | |
1589 | } | |
1590 | ||
2547923d LI |
1591 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1592 | if (!link) | |
1593 | return -ENOMEM; | |
1594 | ||
35241d12 LI |
1595 | genpd_lock(subdomain); |
1596 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1597 | |
41e2c8e0 | 1598 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1599 | ret = -EINVAL; |
1600 | goto out; | |
1601 | } | |
1602 | ||
2547923d LI |
1603 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1604 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1605 | ret = -EINVAL; |
1606 | goto out; | |
1607 | } | |
1608 | } | |
1609 | ||
5063ce15 RW |
1610 | link->master = genpd; |
1611 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1612 | link->slave = subdomain; |
1613 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
41e2c8e0 | 1614 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1615 | genpd_sd_counter_inc(genpd); |
f721889f | 1616 | |
f721889f | 1617 | out: |
35241d12 LI |
1618 | genpd_unlock(genpd); |
1619 | genpd_unlock(subdomain); | |
2547923d LI |
1620 | if (ret) |
1621 | kfree(link); | |
f721889f RW |
1622 | return ret; |
1623 | } | |
19efa5ff JH |
1624 | |
1625 | /** | |
1626 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1627 | * @genpd: Master PM domain to add the subdomain to. | |
1628 | * @subdomain: Subdomain to be added. | |
1629 | */ | |
1630 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1631 | struct generic_pm_domain *subdomain) | |
1632 | { | |
1633 | int ret; | |
1634 | ||
1635 | mutex_lock(&gpd_list_lock); | |
1636 | ret = genpd_add_subdomain(genpd, subdomain); | |
1637 | mutex_unlock(&gpd_list_lock); | |
1638 | ||
1639 | return ret; | |
1640 | } | |
d60ee966 | 1641 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1642 | |
1643 | /** | |
1644 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1645 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1646 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1647 | */ |
1648 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1649 | struct generic_pm_domain *subdomain) |
f721889f | 1650 | { |
c6e83cac | 1651 | struct gpd_link *l, *link; |
f721889f RW |
1652 | int ret = -EINVAL; |
1653 | ||
5063ce15 | 1654 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1655 | return -EINVAL; |
1656 | ||
35241d12 LI |
1657 | genpd_lock(subdomain); |
1658 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1659 | |
beda5fc1 | 1660 | if (!list_empty(&subdomain->master_links) || subdomain->device_count) { |
7a5bd127 JP |
1661 | pr_warn("%s: unable to remove subdomain %s\n", |
1662 | genpd->name, subdomain->name); | |
30e7a65b JH |
1663 | ret = -EBUSY; |
1664 | goto out; | |
1665 | } | |
1666 | ||
c6e83cac | 1667 | list_for_each_entry_safe(link, l, &genpd->master_links, master_node) { |
5063ce15 | 1668 | if (link->slave != subdomain) |
f721889f RW |
1669 | continue; |
1670 | ||
5063ce15 RW |
1671 | list_del(&link->master_node); |
1672 | list_del(&link->slave_node); | |
1673 | kfree(link); | |
41e2c8e0 | 1674 | if (genpd_status_on(subdomain)) |
f721889f RW |
1675 | genpd_sd_counter_dec(genpd); |
1676 | ||
f721889f RW |
1677 | ret = 0; |
1678 | break; | |
1679 | } | |
1680 | ||
30e7a65b | 1681 | out: |
35241d12 LI |
1682 | genpd_unlock(genpd); |
1683 | genpd_unlock(subdomain); | |
f721889f RW |
1684 | |
1685 | return ret; | |
1686 | } | |
d60ee966 | 1687 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1688 | |
49a27e27 UH |
1689 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1690 | unsigned int state_count) | |
1691 | { | |
1692 | kfree(states); | |
1693 | } | |
1694 | ||
59d65b73 LI |
1695 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1696 | { | |
1697 | struct genpd_power_state *state; | |
1698 | ||
1699 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1700 | if (!state) | |
1701 | return -ENOMEM; | |
1702 | ||
1703 | genpd->states = state; | |
1704 | genpd->state_count = 1; | |
49a27e27 | 1705 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1706 | |
1707 | return 0; | |
1708 | } | |
1709 | ||
d716f479 LI |
1710 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1711 | { | |
1712 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1713 | spin_lock_init(&genpd->slock); | |
1714 | genpd->lock_ops = &genpd_spin_ops; | |
1715 | } else { | |
1716 | mutex_init(&genpd->mlock); | |
1717 | genpd->lock_ops = &genpd_mtx_ops; | |
1718 | } | |
1719 | } | |
1720 | ||
f721889f RW |
1721 | /** |
1722 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1723 | * @genpd: PM domain object to initialize. | |
1724 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1725 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1726 | * |
1727 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1728 | */ |
7eb231c3 UH |
1729 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1730 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1731 | { |
59d65b73 LI |
1732 | int ret; |
1733 | ||
f721889f | 1734 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1735 | return -EINVAL; |
f721889f | 1736 | |
5063ce15 RW |
1737 | INIT_LIST_HEAD(&genpd->master_links); |
1738 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1739 | INIT_LIST_HEAD(&genpd->dev_list); |
d716f479 | 1740 | genpd_lock_init(genpd); |
f721889f RW |
1741 | genpd->gov = gov; |
1742 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1743 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1744 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1745 | genpd->device_count = 0; |
221e9b58 | 1746 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1747 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1748 | genpd->provider = NULL; |
1749 | genpd->has_provider = false; | |
afece3ab | 1750 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1751 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1752 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1753 | genpd->domain.ops.prepare = genpd_prepare; |
1754 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1755 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1756 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1757 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1758 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1759 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1760 | genpd->domain.ops.complete = genpd_complete; | |
c11f6f5b UH |
1761 | |
1762 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1763 | genpd->dev_ops.stop = pm_clk_suspend; | |
1764 | genpd->dev_ops.start = pm_clk_resume; | |
1765 | } | |
1766 | ||
ffaa42e8 UH |
1767 | /* Always-on domains must be powered on at initialization. */ |
1768 | if (genpd_is_always_on(genpd) && !genpd_status_on(genpd)) | |
1769 | return -EINVAL; | |
1770 | ||
fc5cbf0c | 1771 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1772 | if (genpd->state_count == 0) { |
1773 | ret = genpd_set_default_power_state(genpd); | |
1774 | if (ret) | |
1775 | return ret; | |
46b7fe94 | 1776 | } else if (!gov && genpd->state_count > 1) { |
7a5bd127 | 1777 | pr_warn("%s: no governor for states\n", genpd->name); |
59d65b73 | 1778 | } |
fc5cbf0c | 1779 | |
401ea157 VK |
1780 | device_initialize(&genpd->dev); |
1781 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1782 | ||
5125bbf3 RW |
1783 | mutex_lock(&gpd_list_lock); |
1784 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1785 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1786 | |
1787 | return 0; | |
5125bbf3 | 1788 | } |
be5ed55d | 1789 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1790 | |
3fe57710 JH |
1791 | static int genpd_remove(struct generic_pm_domain *genpd) |
1792 | { | |
1793 | struct gpd_link *l, *link; | |
1794 | ||
1795 | if (IS_ERR_OR_NULL(genpd)) | |
1796 | return -EINVAL; | |
1797 | ||
35241d12 | 1798 | genpd_lock(genpd); |
3fe57710 JH |
1799 | |
1800 | if (genpd->has_provider) { | |
35241d12 | 1801 | genpd_unlock(genpd); |
3fe57710 JH |
1802 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1803 | return -EBUSY; | |
1804 | } | |
1805 | ||
1806 | if (!list_empty(&genpd->master_links) || genpd->device_count) { | |
35241d12 | 1807 | genpd_unlock(genpd); |
3fe57710 JH |
1808 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1809 | return -EBUSY; | |
1810 | } | |
1811 | ||
1812 | list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) { | |
1813 | list_del(&link->master_node); | |
1814 | list_del(&link->slave_node); | |
1815 | kfree(link); | |
1816 | } | |
1817 | ||
1818 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1819 | genpd_unlock(genpd); |
3fe57710 | 1820 | cancel_work_sync(&genpd->power_off_work); |
49a27e27 UH |
1821 | if (genpd->free_states) |
1822 | genpd->free_states(genpd->states, genpd->state_count); | |
1823 | ||
3fe57710 JH |
1824 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
1825 | ||
1826 | return 0; | |
1827 | } | |
1828 | ||
1829 | /** | |
1830 | * pm_genpd_remove - Remove a generic I/O PM domain | |
1831 | * @genpd: Pointer to PM domain that is to be removed. | |
1832 | * | |
1833 | * To remove the PM domain, this function: | |
1834 | * - Removes the PM domain as a subdomain to any parent domains, | |
1835 | * if it was added. | |
1836 | * - Removes the PM domain from the list of registered PM domains. | |
1837 | * | |
1838 | * The PM domain will only be removed, if the associated provider has | |
1839 | * been removed, it is not a parent to any other PM domain and has no | |
1840 | * devices associated with it. | |
1841 | */ | |
1842 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
1843 | { | |
1844 | int ret; | |
1845 | ||
1846 | mutex_lock(&gpd_list_lock); | |
1847 | ret = genpd_remove(genpd); | |
1848 | mutex_unlock(&gpd_list_lock); | |
1849 | ||
1850 | return ret; | |
1851 | } | |
1852 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
1853 | ||
aa42240a | 1854 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 1855 | |
aa42240a TF |
1856 | /* |
1857 | * Device Tree based PM domain providers. | |
1858 | * | |
1859 | * The code below implements generic device tree based PM domain providers that | |
1860 | * bind device tree nodes with generic PM domains registered in the system. | |
1861 | * | |
1862 | * Any driver that registers generic PM domains and needs to support binding of | |
1863 | * devices to these domains is supposed to register a PM domain provider, which | |
1864 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1865 | * | |
1866 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
1867 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
1868 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
1869 | * index. |
1870 | */ | |
1871 | ||
1872 | /** | |
1873 | * struct of_genpd_provider - PM domain provider registration structure | |
1874 | * @link: Entry in global list of PM domain providers | |
1875 | * @node: Pointer to device tree node of PM domain provider | |
1876 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1877 | * into a PM domain. | |
1878 | * @data: context pointer to be passed into @xlate callback | |
1879 | */ | |
1880 | struct of_genpd_provider { | |
1881 | struct list_head link; | |
1882 | struct device_node *node; | |
1883 | genpd_xlate_t xlate; | |
1884 | void *data; | |
1885 | }; | |
1886 | ||
1887 | /* List of registered PM domain providers. */ | |
1888 | static LIST_HEAD(of_genpd_providers); | |
1889 | /* Mutex to protect the list above. */ | |
1890 | static DEFINE_MUTEX(of_genpd_mutex); | |
1891 | ||
1892 | /** | |
892ebdcc | 1893 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
1894 | * @genpdspec: OF phandle args to map into a PM domain |
1895 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1896 | * | |
1897 | * This is a generic xlate function that can be used to model PM domains that | |
1898 | * have their own device tree nodes. The private data of xlate function needs | |
1899 | * to be a valid pointer to struct generic_pm_domain. | |
1900 | */ | |
892ebdcc | 1901 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
1902 | struct of_phandle_args *genpdspec, |
1903 | void *data) | |
1904 | { | |
aa42240a TF |
1905 | return data; |
1906 | } | |
aa42240a TF |
1907 | |
1908 | /** | |
892ebdcc | 1909 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
1910 | * @genpdspec: OF phandle args to map into a PM domain |
1911 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1912 | * | |
1913 | * This is a generic xlate function that can be used to model simple PM domain | |
1914 | * controllers that have one device tree node and provide multiple PM domains. | |
1915 | * A single cell is used as an index into an array of PM domains specified in | |
1916 | * the genpd_onecell_data struct when registering the provider. | |
1917 | */ | |
892ebdcc | 1918 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
1919 | struct of_phandle_args *genpdspec, |
1920 | void *data) | |
1921 | { | |
1922 | struct genpd_onecell_data *genpd_data = data; | |
1923 | unsigned int idx = genpdspec->args[0]; | |
1924 | ||
1925 | if (genpdspec->args_count != 1) | |
1926 | return ERR_PTR(-EINVAL); | |
1927 | ||
1928 | if (idx >= genpd_data->num_domains) { | |
1929 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1930 | return ERR_PTR(-EINVAL); | |
1931 | } | |
1932 | ||
1933 | if (!genpd_data->domains[idx]) | |
1934 | return ERR_PTR(-ENOENT); | |
1935 | ||
1936 | return genpd_data->domains[idx]; | |
1937 | } | |
aa42240a TF |
1938 | |
1939 | /** | |
892ebdcc | 1940 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
1941 | * @np: Device node pointer associated with the PM domain provider. |
1942 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1943 | * @data: Context pointer for @xlate callback. | |
1944 | */ | |
892ebdcc JH |
1945 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
1946 | void *data) | |
aa42240a TF |
1947 | { |
1948 | struct of_genpd_provider *cp; | |
1949 | ||
1950 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1951 | if (!cp) | |
1952 | return -ENOMEM; | |
1953 | ||
1954 | cp->node = of_node_get(np); | |
1955 | cp->data = data; | |
1956 | cp->xlate = xlate; | |
1957 | ||
1958 | mutex_lock(&of_genpd_mutex); | |
1959 | list_add(&cp->link, &of_genpd_providers); | |
1960 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 1961 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
1962 | |
1963 | return 0; | |
1964 | } | |
892ebdcc JH |
1965 | |
1966 | /** | |
1967 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
1968 | * @np: Device node pointer associated with the PM domain provider. | |
1969 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
1970 | */ | |
1971 | int of_genpd_add_provider_simple(struct device_node *np, | |
1972 | struct generic_pm_domain *genpd) | |
1973 | { | |
0159ec67 JH |
1974 | int ret = -EINVAL; |
1975 | ||
1976 | if (!np || !genpd) | |
1977 | return -EINVAL; | |
1978 | ||
1979 | mutex_lock(&gpd_list_lock); | |
1980 | ||
6a0ae73d VK |
1981 | if (!genpd_present(genpd)) |
1982 | goto unlock; | |
1983 | ||
1984 | genpd->dev.of_node = np; | |
1985 | ||
1986 | /* Parse genpd OPP table */ | |
1987 | if (genpd->set_performance_state) { | |
1988 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
1989 | if (ret) { | |
1990 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
1991 | ret); | |
1992 | goto unlock; | |
8ce95844 | 1993 | } |
1067ae3e VK |
1994 | |
1995 | /* | |
1996 | * Save table for faster processing while setting performance | |
1997 | * state. | |
1998 | */ | |
1999 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
2000 | WARN_ON(!genpd->opp_table); | |
de0aa06d JH |
2001 | } |
2002 | ||
6a0ae73d VK |
2003 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2004 | if (ret) { | |
1067ae3e VK |
2005 | if (genpd->set_performance_state) { |
2006 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2007 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2008 | } |
6a0ae73d VK |
2009 | |
2010 | goto unlock; | |
2011 | } | |
2012 | ||
2013 | genpd->provider = &np->fwnode; | |
2014 | genpd->has_provider = true; | |
2015 | ||
2016 | unlock: | |
0159ec67 JH |
2017 | mutex_unlock(&gpd_list_lock); |
2018 | ||
2019 | return ret; | |
892ebdcc JH |
2020 | } |
2021 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2022 | ||
2023 | /** | |
2024 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2025 | * @np: Device node pointer associated with the PM domain provider. | |
2026 | * @data: Pointer to the data associated with the PM domain provider. | |
2027 | */ | |
2028 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2029 | struct genpd_onecell_data *data) | |
2030 | { | |
6a0ae73d | 2031 | struct generic_pm_domain *genpd; |
0159ec67 | 2032 | unsigned int i; |
de0aa06d | 2033 | int ret = -EINVAL; |
0159ec67 JH |
2034 | |
2035 | if (!np || !data) | |
2036 | return -EINVAL; | |
2037 | ||
2038 | mutex_lock(&gpd_list_lock); | |
2039 | ||
40845524 TR |
2040 | if (!data->xlate) |
2041 | data->xlate = genpd_xlate_onecell; | |
2042 | ||
0159ec67 | 2043 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2044 | genpd = data->domains[i]; |
2045 | ||
2046 | if (!genpd) | |
609bed67 | 2047 | continue; |
6a0ae73d | 2048 | if (!genpd_present(genpd)) |
de0aa06d JH |
2049 | goto error; |
2050 | ||
6a0ae73d VK |
2051 | genpd->dev.of_node = np; |
2052 | ||
2053 | /* Parse genpd OPP table */ | |
2054 | if (genpd->set_performance_state) { | |
2055 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2056 | if (ret) { | |
2057 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2058 | i, ret); | |
2059 | goto error; | |
2060 | } | |
1067ae3e VK |
2061 | |
2062 | /* | |
2063 | * Save table for faster processing while setting | |
2064 | * performance state. | |
2065 | */ | |
2066 | genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); | |
2067 | WARN_ON(!genpd->opp_table); | |
6a0ae73d VK |
2068 | } |
2069 | ||
2070 | genpd->provider = &np->fwnode; | |
2071 | genpd->has_provider = true; | |
0159ec67 JH |
2072 | } |
2073 | ||
40845524 | 2074 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2075 | if (ret < 0) |
2076 | goto error; | |
2077 | ||
2078 | mutex_unlock(&gpd_list_lock); | |
2079 | ||
2080 | return 0; | |
2081 | ||
2082 | error: | |
2083 | while (i--) { | |
6a0ae73d VK |
2084 | genpd = data->domains[i]; |
2085 | ||
2086 | if (!genpd) | |
609bed67 | 2087 | continue; |
6a0ae73d VK |
2088 | |
2089 | genpd->provider = NULL; | |
2090 | genpd->has_provider = false; | |
2091 | ||
1067ae3e VK |
2092 | if (genpd->set_performance_state) { |
2093 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2094 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2095 | } |
de0aa06d | 2096 | } |
0159ec67 JH |
2097 | |
2098 | mutex_unlock(&gpd_list_lock); | |
2099 | ||
2100 | return ret; | |
892ebdcc JH |
2101 | } |
2102 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2103 | |
2104 | /** | |
2105 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2106 | * @np: Device node pointer associated with the PM domain provider | |
2107 | */ | |
2108 | void of_genpd_del_provider(struct device_node *np) | |
2109 | { | |
b556b15d | 2110 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2111 | struct generic_pm_domain *gpd; |
aa42240a | 2112 | |
de0aa06d | 2113 | mutex_lock(&gpd_list_lock); |
aa42240a | 2114 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2115 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2116 | if (cp->node == np) { |
de0aa06d JH |
2117 | /* |
2118 | * For each PM domain associated with the | |
2119 | * provider, set the 'has_provider' to false | |
2120 | * so that the PM domain can be safely removed. | |
2121 | */ | |
6a0ae73d VK |
2122 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2123 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2124 | gpd->has_provider = false; |
2125 | ||
6a0ae73d VK |
2126 | if (!gpd->set_performance_state) |
2127 | continue; | |
2128 | ||
1067ae3e | 2129 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2130 | dev_pm_opp_of_remove_table(&gpd->dev); |
2131 | } | |
2132 | } | |
2133 | ||
aa42240a TF |
2134 | list_del(&cp->link); |
2135 | of_node_put(cp->node); | |
2136 | kfree(cp); | |
2137 | break; | |
2138 | } | |
2139 | } | |
2140 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2141 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2142 | } |
2143 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2144 | ||
2145 | /** | |
f58d4e5a | 2146 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2147 | * @genpdspec: OF phandle args to use for look-up |
2148 | * | |
2149 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2150 | * found, uses xlate function of the provider to map phandle args to a PM | |
2151 | * domain. | |
2152 | * | |
2153 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2154 | * on failure. | |
2155 | */ | |
f58d4e5a | 2156 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2157 | struct of_phandle_args *genpdspec) |
2158 | { | |
2159 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2160 | struct of_genpd_provider *provider; | |
2161 | ||
41795a8a JH |
2162 | if (!genpdspec) |
2163 | return ERR_PTR(-EINVAL); | |
2164 | ||
aa42240a TF |
2165 | mutex_lock(&of_genpd_mutex); |
2166 | ||
2167 | /* Check if we have such a provider in our array */ | |
2168 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2169 | if (provider->node == genpdspec->np) | |
2170 | genpd = provider->xlate(genpdspec, provider->data); | |
2171 | if (!IS_ERR(genpd)) | |
2172 | break; | |
2173 | } | |
2174 | ||
2175 | mutex_unlock(&of_genpd_mutex); | |
2176 | ||
2177 | return genpd; | |
2178 | } | |
2179 | ||
ec69572b JH |
2180 | /** |
2181 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2182 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2183 | * @dev: Device to be added. | |
2184 | * | |
2185 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2186 | * the device to the PM domain. Returns a negative error code on failure. | |
2187 | */ | |
2188 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2189 | { | |
2190 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2191 | int ret; |
2192 | ||
2193 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2194 | |
f58d4e5a | 2195 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2196 | if (IS_ERR(genpd)) { |
2197 | ret = PTR_ERR(genpd); | |
2198 | goto out; | |
2199 | } | |
2200 | ||
2201 | ret = genpd_add_device(genpd, dev, NULL); | |
ec69572b | 2202 | |
19efa5ff JH |
2203 | out: |
2204 | mutex_unlock(&gpd_list_lock); | |
2205 | ||
2206 | return ret; | |
ec69572b JH |
2207 | } |
2208 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2209 | ||
2210 | /** | |
2211 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2212 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2213 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2214 | * | |
2215 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2216 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2217 | * negative error code on failure. | |
2218 | */ | |
2219 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2220 | struct of_phandle_args *subdomain_spec) | |
2221 | { | |
2222 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2223 | int ret; |
2224 | ||
2225 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2226 | |
f58d4e5a | 2227 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2228 | if (IS_ERR(parent)) { |
2229 | ret = PTR_ERR(parent); | |
2230 | goto out; | |
2231 | } | |
ec69572b | 2232 | |
f58d4e5a | 2233 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2234 | if (IS_ERR(subdomain)) { |
2235 | ret = PTR_ERR(subdomain); | |
2236 | goto out; | |
2237 | } | |
2238 | ||
2239 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2240 | |
19efa5ff JH |
2241 | out: |
2242 | mutex_unlock(&gpd_list_lock); | |
2243 | ||
2244 | return ret; | |
ec69572b JH |
2245 | } |
2246 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2247 | ||
17926551 JH |
2248 | /** |
2249 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2250 | * @provider: Pointer to device structure associated with provider | |
2251 | * | |
2252 | * Find the last PM domain that was added by a particular provider and | |
2253 | * remove this PM domain from the list of PM domains. The provider is | |
2254 | * identified by the 'provider' device structure that is passed. The PM | |
2255 | * domain will only be removed, if the provider associated with domain | |
2256 | * has been removed. | |
2257 | * | |
2258 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2259 | * ERR_PTR() on failure. | |
2260 | */ | |
2261 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2262 | { | |
a7e2d1bc | 2263 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2264 | int ret; |
2265 | ||
2266 | if (IS_ERR_OR_NULL(np)) | |
2267 | return ERR_PTR(-EINVAL); | |
2268 | ||
2269 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2270 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2271 | if (gpd->provider == &np->fwnode) { |
2272 | ret = genpd_remove(gpd); | |
2273 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2274 | break; | |
2275 | } | |
2276 | } | |
2277 | mutex_unlock(&gpd_list_lock); | |
2278 | ||
2279 | return genpd; | |
2280 | } | |
2281 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2282 | ||
3c095f32 UH |
2283 | static void genpd_release_dev(struct device *dev) |
2284 | { | |
2285 | kfree(dev); | |
2286 | } | |
2287 | ||
2288 | static struct bus_type genpd_bus_type = { | |
2289 | .name = "genpd", | |
2290 | }; | |
2291 | ||
aa42240a TF |
2292 | /** |
2293 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2294 | * @dev: Device to detach. |
aa42240a TF |
2295 | * @power_off: Currently not used |
2296 | * | |
2297 | * Try to locate a corresponding generic PM domain, which the device was | |
2298 | * attached to previously. If such is found, the device is detached from it. | |
2299 | */ | |
2300 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2301 | { | |
446d999c | 2302 | struct generic_pm_domain *pd; |
93af5e93 | 2303 | unsigned int i; |
aa42240a TF |
2304 | int ret = 0; |
2305 | ||
85168d56 UH |
2306 | pd = dev_to_genpd(dev); |
2307 | if (IS_ERR(pd)) | |
aa42240a TF |
2308 | return; |
2309 | ||
2310 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2311 | ||
93af5e93 | 2312 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2313 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2314 | if (ret != -EAGAIN) |
2315 | break; | |
93af5e93 GU |
2316 | |
2317 | mdelay(i); | |
aa42240a TF |
2318 | cond_resched(); |
2319 | } | |
2320 | ||
2321 | if (ret < 0) { | |
2322 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2323 | pd->name, ret); | |
2324 | return; | |
2325 | } | |
2326 | ||
2327 | /* Check if PM domain can be powered off after removing this device. */ | |
2328 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2329 | |
2330 | /* Unregister the device if it was created by genpd. */ | |
2331 | if (dev->bus == &genpd_bus_type) | |
2332 | device_unregister(dev); | |
aa42240a TF |
2333 | } |
2334 | ||
632f7ce3 RK |
2335 | static void genpd_dev_pm_sync(struct device *dev) |
2336 | { | |
2337 | struct generic_pm_domain *pd; | |
2338 | ||
2339 | pd = dev_to_genpd(dev); | |
2340 | if (IS_ERR(pd)) | |
2341 | return; | |
2342 | ||
2343 | genpd_queue_power_off_work(pd); | |
2344 | } | |
2345 | ||
8cb1cbd6 | 2346 | static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np, |
895b6612 | 2347 | unsigned int index, bool power_on) |
aa42240a TF |
2348 | { |
2349 | struct of_phandle_args pd_args; | |
2350 | struct generic_pm_domain *pd; | |
2351 | int ret; | |
2352 | ||
8cb1cbd6 UH |
2353 | ret = of_parse_phandle_with_args(np, "power-domains", |
2354 | "#power-domain-cells", index, &pd_args); | |
001d50c9 | 2355 | if (ret < 0) |
bcd931f2 | 2356 | return ret; |
aa42240a | 2357 | |
19efa5ff | 2358 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2359 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2360 | of_node_put(pd_args.np); |
aa42240a | 2361 | if (IS_ERR(pd)) { |
19efa5ff | 2362 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2363 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2364 | __func__, PTR_ERR(pd)); | |
e01afc32 | 2365 | return driver_deferred_probe_check_state(dev); |
aa42240a TF |
2366 | } |
2367 | ||
2368 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2369 | ||
b56d9c91 | 2370 | ret = genpd_add_device(pd, dev, NULL); |
19efa5ff | 2371 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2372 | |
2373 | if (ret < 0) { | |
34994692 GU |
2374 | if (ret != -EPROBE_DEFER) |
2375 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2376 | pd->name, ret); | |
919b7308 | 2377 | return ret; |
aa42240a TF |
2378 | } |
2379 | ||
2380 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2381 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2382 | |
895b6612 UH |
2383 | if (power_on) { |
2384 | genpd_lock(pd); | |
2385 | ret = genpd_power_on(pd, 0); | |
2386 | genpd_unlock(pd); | |
2387 | } | |
72038df3 UH |
2388 | |
2389 | if (ret) | |
2390 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2391 | |
2392 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2393 | } |
8cb1cbd6 UH |
2394 | |
2395 | /** | |
2396 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2397 | * @dev: Device to attach. | |
2398 | * | |
2399 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2400 | * attaches the device to retrieved pm_domain ops. | |
2401 | * | |
2402 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2403 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2404 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2405 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2406 | * not probed and to re-try again later. | |
2407 | */ | |
2408 | int genpd_dev_pm_attach(struct device *dev) | |
2409 | { | |
2410 | if (!dev->of_node) | |
2411 | return 0; | |
2412 | ||
2413 | /* | |
2414 | * Devices with multiple PM domains must be attached separately, as we | |
2415 | * can only attach one PM domain per device. | |
2416 | */ | |
2417 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2418 | "#power-domain-cells") != 1) | |
2419 | return 0; | |
2420 | ||
895b6612 | 2421 | return __genpd_dev_pm_attach(dev, dev->of_node, 0, true); |
8cb1cbd6 | 2422 | } |
aa42240a | 2423 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2424 | |
3c095f32 UH |
2425 | /** |
2426 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2427 | * @dev: The device used to lookup the PM domain. | |
2428 | * @index: The index of the PM domain. | |
2429 | * | |
2430 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2431 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2432 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2433 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2434 | * | |
2435 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2436 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2437 | * failures. If a power-domain exists for the device, but cannot be found or | |
2438 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2439 | * is not probed and to re-try again later. | |
2440 | */ | |
2441 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2442 | unsigned int index) | |
2443 | { | |
560928b2 | 2444 | struct device *virt_dev; |
3c095f32 UH |
2445 | int num_domains; |
2446 | int ret; | |
2447 | ||
2448 | if (!dev->of_node) | |
2449 | return NULL; | |
2450 | ||
2451 | /* Deal only with devices using multiple PM domains. */ | |
2452 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", | |
2453 | "#power-domain-cells"); | |
2454 | if (num_domains < 2 || index >= num_domains) | |
2455 | return NULL; | |
2456 | ||
2457 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2458 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2459 | if (!virt_dev) | |
3c095f32 UH |
2460 | return ERR_PTR(-ENOMEM); |
2461 | ||
560928b2 VK |
2462 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2463 | virt_dev->bus = &genpd_bus_type; | |
2464 | virt_dev->release = genpd_release_dev; | |
3c095f32 | 2465 | |
560928b2 | 2466 | ret = device_register(virt_dev); |
3c095f32 | 2467 | if (ret) { |
560928b2 | 2468 | kfree(virt_dev); |
3c095f32 UH |
2469 | return ERR_PTR(ret); |
2470 | } | |
2471 | ||
2472 | /* Try to attach the device to the PM domain at the specified index. */ | |
560928b2 | 2473 | ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false); |
3c095f32 | 2474 | if (ret < 1) { |
560928b2 | 2475 | device_unregister(virt_dev); |
3c095f32 UH |
2476 | return ret ? ERR_PTR(ret) : NULL; |
2477 | } | |
2478 | ||
560928b2 VK |
2479 | pm_runtime_enable(virt_dev); |
2480 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2481 | |
560928b2 | 2482 | return virt_dev; |
3c095f32 UH |
2483 | } |
2484 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2485 | ||
5d6be70a UH |
2486 | /** |
2487 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2488 | * @dev: The device used to lookup the PM domain. | |
2489 | * @name: The name of the PM domain. | |
2490 | * | |
2491 | * Parse device's OF node to find a PM domain specifier using the | |
2492 | * power-domain-names DT property. For further description see | |
2493 | * genpd_dev_pm_attach_by_id(). | |
2494 | */ | |
7416f1f2 | 2495 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2496 | { |
2497 | int index; | |
2498 | ||
2499 | if (!dev->of_node) | |
2500 | return NULL; | |
2501 | ||
2502 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2503 | name); | |
2504 | if (index < 0) | |
2505 | return NULL; | |
2506 | ||
2507 | return genpd_dev_pm_attach_by_id(dev, index); | |
2508 | } | |
2509 | ||
30f60428 | 2510 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2511 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2512 | { } |
2513 | }; | |
2514 | ||
2515 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2516 | struct device_node *state_node) | |
2517 | { | |
2518 | int err; | |
2519 | u32 residency; | |
2520 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2521 | |
2522 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2523 | &entry_latency); | |
2524 | if (err) { | |
ea11e94b | 2525 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2526 | state_node); |
30f60428 LI |
2527 | return -EINVAL; |
2528 | } | |
2529 | ||
2530 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2531 | &exit_latency); | |
2532 | if (err) { | |
ea11e94b | 2533 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2534 | state_node); |
30f60428 LI |
2535 | return -EINVAL; |
2536 | } | |
2537 | ||
2538 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2539 | if (!err) | |
2540 | genpd_state->residency_ns = 1000 * residency; | |
2541 | ||
2542 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2543 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2544 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2545 | |
2546 | return 0; | |
2547 | } | |
2548 | ||
a3381e3a UH |
2549 | static int genpd_iterate_idle_states(struct device_node *dn, |
2550 | struct genpd_power_state *states) | |
2551 | { | |
2552 | int ret; | |
2553 | struct of_phandle_iterator it; | |
2554 | struct device_node *np; | |
2555 | int i = 0; | |
2556 | ||
2557 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2558 | if (ret <= 0) | |
2559 | return ret; | |
2560 | ||
2561 | /* Loop over the phandles until all the requested entry is found */ | |
2562 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2563 | np = it.node; | |
2564 | if (!of_match_node(idle_state_match, np)) | |
2565 | continue; | |
2566 | if (states) { | |
2567 | ret = genpd_parse_state(&states[i], np); | |
2568 | if (ret) { | |
2569 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2570 | np, ret); | |
2571 | of_node_put(np); | |
2572 | return ret; | |
2573 | } | |
2574 | } | |
2575 | i++; | |
2576 | } | |
2577 | ||
2578 | return i; | |
2579 | } | |
2580 | ||
30f60428 LI |
2581 | /** |
2582 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2583 | * | |
2584 | * @dn: The genpd device node | |
2585 | * @states: The pointer to which the state array will be saved. | |
2586 | * @n: The count of elements in the array returned from this function. | |
2587 | * | |
2588 | * Returns the device states parsed from the OF node. The memory for the states | |
2589 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2590 | * free the memory after use. If any or zero compatible domain idle states is |
2591 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2592 | */ |
2593 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2594 | struct genpd_power_state **states, int *n) | |
2595 | { | |
2596 | struct genpd_power_state *st; | |
a3381e3a | 2597 | int ret; |
30f60428 | 2598 | |
a3381e3a | 2599 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2600 | if (ret < 0) |
2601 | return ret; | |
2602 | ||
2603 | if (!ret) { | |
2604 | *states = NULL; | |
2605 | *n = 0; | |
2606 | return 0; | |
2607 | } | |
30f60428 | 2608 | |
a3381e3a | 2609 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2610 | if (!st) |
2611 | return -ENOMEM; | |
2612 | ||
a3381e3a UH |
2613 | ret = genpd_iterate_idle_states(dn, st); |
2614 | if (ret <= 0) { | |
2615 | kfree(st); | |
2616 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2617 | } |
2618 | ||
a3381e3a UH |
2619 | *states = st; |
2620 | *n = ret; | |
30f60428 LI |
2621 | |
2622 | return 0; | |
2623 | } | |
2624 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2625 | ||
e38f89d3 VK |
2626 | /** |
2627 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2628 | * | |
2629 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2630 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2631 | * state. | |
2632 | * | |
2633 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2634 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2635 | * power domain OPP to performance state. | |
2636 | * | |
2637 | * Returns performance state on success and 0 on failure. | |
2638 | */ | |
2639 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2640 | struct dev_pm_opp *opp) | |
2641 | { | |
2642 | struct generic_pm_domain *genpd = NULL; | |
2643 | int state; | |
2644 | ||
2645 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2646 | ||
2647 | if (unlikely(!genpd->opp_to_performance_state)) | |
2648 | return 0; | |
2649 | ||
2650 | genpd_lock(genpd); | |
2651 | state = genpd->opp_to_performance_state(genpd, opp); | |
2652 | genpd_unlock(genpd); | |
2653 | ||
2654 | return state; | |
2655 | } | |
2656 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2657 | ||
3c095f32 UH |
2658 | static int __init genpd_bus_init(void) |
2659 | { | |
2660 | return bus_register(&genpd_bus_type); | |
2661 | } | |
2662 | core_initcall(genpd_bus_init); | |
2663 | ||
d30d819d | 2664 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2665 | |
2666 | ||
2667 | /*** debugfs support ***/ | |
2668 | ||
8b0510b5 | 2669 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2670 | #include <linux/pm.h> |
2671 | #include <linux/device.h> | |
2672 | #include <linux/debugfs.h> | |
2673 | #include <linux/seq_file.h> | |
2674 | #include <linux/init.h> | |
2675 | #include <linux/kobject.h> | |
9e9704ea | 2676 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2677 | |
2678 | /* | |
2679 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2680 | * from sysfs.c, so generalize it. |
2bd5306a | 2681 | */ |
2bd5306a MM |
2682 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2683 | { | |
2684 | static const char * const status_lookup[] = { | |
2685 | [RPM_ACTIVE] = "active", | |
2686 | [RPM_RESUMING] = "resuming", | |
2687 | [RPM_SUSPENDED] = "suspended", | |
2688 | [RPM_SUSPENDING] = "suspending" | |
2689 | }; | |
2690 | const char *p = ""; | |
2691 | ||
2692 | if (dev->power.runtime_error) | |
2693 | p = "error"; | |
2694 | else if (dev->power.disable_depth) | |
2695 | p = "unsupported"; | |
2696 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2697 | p = status_lookup[dev->power.runtime_status]; | |
2698 | else | |
2699 | WARN_ON(1); | |
2700 | ||
2701 | seq_puts(s, p); | |
2702 | } | |
2bd5306a | 2703 | |
9e9704ea UH |
2704 | static int genpd_summary_one(struct seq_file *s, |
2705 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2706 | { |
2707 | static const char * const status_lookup[] = { | |
2708 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2709 | [GPD_STATE_POWER_OFF] = "off" |
2710 | }; | |
2711 | struct pm_domain_data *pm_data; | |
2712 | const char *kobj_path; | |
2713 | struct gpd_link *link; | |
6954d432 | 2714 | char state[16]; |
2bd5306a MM |
2715 | int ret; |
2716 | ||
35241d12 | 2717 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2718 | if (ret) |
2719 | return -ERESTARTSYS; | |
2720 | ||
66a5ca4b | 2721 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2722 | goto exit; |
41e2c8e0 | 2723 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2724 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2725 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2726 | else |
6954d432 GU |
2727 | snprintf(state, sizeof(state), "%s", |
2728 | status_lookup[genpd->status]); | |
2729 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2730 | |
2731 | /* | |
2732 | * Modifications on the list require holding locks on both | |
2733 | * master and slave, so we are safe. | |
66a5ca4b | 2734 | * Also genpd->name is immutable. |
2bd5306a | 2735 | */ |
66a5ca4b | 2736 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2737 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2738 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2739 | seq_puts(s, ", "); |
2740 | } | |
2741 | ||
66a5ca4b | 2742 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2743 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2744 | genpd_is_irq_safe(genpd) ? | |
2745 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2746 | if (kobj_path == NULL) |
2747 | continue; | |
2748 | ||
2749 | seq_printf(s, "\n %-50s ", kobj_path); | |
2750 | rtpm_status_str(s, pm_data->dev); | |
2751 | kfree(kobj_path); | |
2752 | } | |
2753 | ||
2754 | seq_puts(s, "\n"); | |
2755 | exit: | |
35241d12 | 2756 | genpd_unlock(genpd); |
2bd5306a MM |
2757 | |
2758 | return 0; | |
2759 | } | |
2760 | ||
d32dcc6c | 2761 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 2762 | { |
66a5ca4b | 2763 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2764 | int ret = 0; |
2765 | ||
15dec67a GU |
2766 | seq_puts(s, "domain status slaves\n"); |
2767 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2768 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2769 | ||
2770 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2771 | if (ret) | |
2772 | return -ERESTARTSYS; | |
2773 | ||
66a5ca4b | 2774 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2775 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
2776 | if (ret) |
2777 | break; | |
2778 | } | |
2779 | mutex_unlock(&gpd_list_lock); | |
2780 | ||
2781 | return ret; | |
2782 | } | |
2783 | ||
d32dcc6c | 2784 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 2785 | { |
b6a1d093 TG |
2786 | static const char * const status_lookup[] = { |
2787 | [GPD_STATE_ACTIVE] = "on", | |
2788 | [GPD_STATE_POWER_OFF] = "off" | |
2789 | }; | |
2790 | ||
2791 | struct generic_pm_domain *genpd = s->private; | |
2792 | int ret = 0; | |
2793 | ||
2794 | ret = genpd_lock_interruptible(genpd); | |
2795 | if (ret) | |
2796 | return -ERESTARTSYS; | |
2797 | ||
2798 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
2799 | goto exit; | |
2800 | ||
2801 | if (genpd->status == GPD_STATE_POWER_OFF) | |
2802 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], | |
2803 | genpd->state_idx); | |
2804 | else | |
2805 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
2806 | exit: | |
2807 | genpd_unlock(genpd); | |
2808 | return ret; | |
2bd5306a MM |
2809 | } |
2810 | ||
d32dcc6c | 2811 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2812 | { |
2813 | struct generic_pm_domain *genpd = s->private; | |
2814 | struct gpd_link *link; | |
2815 | int ret = 0; | |
2816 | ||
2817 | ret = genpd_lock_interruptible(genpd); | |
2818 | if (ret) | |
2819 | return -ERESTARTSYS; | |
2820 | ||
2821 | list_for_each_entry(link, &genpd->master_links, master_node) | |
2822 | seq_printf(s, "%s\n", link->slave->name); | |
2823 | ||
2824 | genpd_unlock(genpd); | |
2825 | return ret; | |
2826 | } | |
2827 | ||
d32dcc6c | 2828 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2829 | { |
2830 | struct generic_pm_domain *genpd = s->private; | |
2831 | unsigned int i; | |
2832 | int ret = 0; | |
2833 | ||
2834 | ret = genpd_lock_interruptible(genpd); | |
2835 | if (ret) | |
2836 | return -ERESTARTSYS; | |
2837 | ||
2838 | seq_puts(s, "State Time Spent(ms)\n"); | |
2839 | ||
2840 | for (i = 0; i < genpd->state_count; i++) { | |
2841 | ktime_t delta = 0; | |
2842 | s64 msecs; | |
2843 | ||
2844 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2845 | (genpd->state_idx == i)) | |
2846 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2847 | ||
2848 | msecs = ktime_to_ms( | |
2849 | ktime_add(genpd->states[i].idle_time, delta)); | |
2850 | seq_printf(s, "S%-13i %lld\n", i, msecs); | |
2851 | } | |
2852 | ||
2853 | genpd_unlock(genpd); | |
2854 | return ret; | |
2855 | } | |
2856 | ||
d32dcc6c | 2857 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2858 | { |
2859 | struct generic_pm_domain *genpd = s->private; | |
2860 | ktime_t delta = 0; | |
2861 | int ret = 0; | |
2862 | ||
2863 | ret = genpd_lock_interruptible(genpd); | |
2864 | if (ret) | |
2865 | return -ERESTARTSYS; | |
2866 | ||
2867 | if (genpd->status == GPD_STATE_ACTIVE) | |
2868 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2869 | ||
2870 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
2871 | ktime_add(genpd->on_time, delta))); | |
2872 | ||
2873 | genpd_unlock(genpd); | |
2874 | return ret; | |
2875 | } | |
2876 | ||
d32dcc6c | 2877 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2878 | { |
2879 | struct generic_pm_domain *genpd = s->private; | |
2880 | ktime_t delta = 0, total = 0; | |
2881 | unsigned int i; | |
2882 | int ret = 0; | |
2883 | ||
2884 | ret = genpd_lock_interruptible(genpd); | |
2885 | if (ret) | |
2886 | return -ERESTARTSYS; | |
2887 | ||
2888 | for (i = 0; i < genpd->state_count; i++) { | |
2889 | ||
2890 | if ((genpd->status == GPD_STATE_POWER_OFF) && | |
2891 | (genpd->state_idx == i)) | |
2892 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
2893 | ||
2894 | total = ktime_add(total, genpd->states[i].idle_time); | |
2895 | } | |
2896 | total = ktime_add(total, delta); | |
2897 | ||
2898 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
2899 | ||
2900 | genpd_unlock(genpd); | |
2901 | return ret; | |
2902 | } | |
2903 | ||
2904 | ||
d32dcc6c | 2905 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
2906 | { |
2907 | struct generic_pm_domain *genpd = s->private; | |
2908 | struct pm_domain_data *pm_data; | |
2909 | const char *kobj_path; | |
2910 | int ret = 0; | |
2911 | ||
2912 | ret = genpd_lock_interruptible(genpd); | |
2913 | if (ret) | |
2914 | return -ERESTARTSYS; | |
2915 | ||
2916 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
2917 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
2918 | genpd_is_irq_safe(genpd) ? | |
2919 | GFP_ATOMIC : GFP_KERNEL); | |
2920 | if (kobj_path == NULL) | |
2921 | continue; | |
2922 | ||
2923 | seq_printf(s, "%s\n", kobj_path); | |
2924 | kfree(kobj_path); | |
2925 | } | |
2926 | ||
2927 | genpd_unlock(genpd); | |
2928 | return ret; | |
2929 | } | |
2930 | ||
d32dcc6c | 2931 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
2932 | { |
2933 | struct generic_pm_domain *genpd = s->private; | |
2934 | ||
2935 | if (genpd_lock_interruptible(genpd)) | |
2936 | return -ERESTARTSYS; | |
2937 | ||
2938 | seq_printf(s, "%u\n", genpd->performance_state); | |
2939 | ||
2940 | genpd_unlock(genpd); | |
2941 | return 0; | |
2942 | } | |
2943 | ||
d32dcc6c YL |
2944 | DEFINE_SHOW_ATTRIBUTE(summary); |
2945 | DEFINE_SHOW_ATTRIBUTE(status); | |
2946 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
2947 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
2948 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
2949 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
2950 | DEFINE_SHOW_ATTRIBUTE(devices); | |
2951 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 2952 | |
9e9704ea | 2953 | static int __init genpd_debug_init(void) |
2bd5306a MM |
2954 | { |
2955 | struct dentry *d; | |
b6a1d093 | 2956 | struct generic_pm_domain *genpd; |
2bd5306a | 2957 | |
9e9704ea | 2958 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 2959 | |
e16a42c3 GKH |
2960 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
2961 | NULL, &summary_fops); | |
2bd5306a | 2962 | |
b6a1d093 | 2963 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 2964 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
2965 | |
2966 | debugfs_create_file("current_state", 0444, | |
d32dcc6c | 2967 | d, genpd, &status_fops); |
b6a1d093 | 2968 | debugfs_create_file("sub_domains", 0444, |
d32dcc6c | 2969 | d, genpd, &sub_domains_fops); |
b6a1d093 | 2970 | debugfs_create_file("idle_states", 0444, |
d32dcc6c | 2971 | d, genpd, &idle_states_fops); |
b6a1d093 | 2972 | debugfs_create_file("active_time", 0444, |
d32dcc6c | 2973 | d, genpd, &active_time_fops); |
b6a1d093 | 2974 | debugfs_create_file("total_idle_time", 0444, |
d32dcc6c | 2975 | d, genpd, &total_idle_time_fops); |
b6a1d093 | 2976 | debugfs_create_file("devices", 0444, |
d32dcc6c | 2977 | d, genpd, &devices_fops); |
e8912812 RN |
2978 | if (genpd->set_performance_state) |
2979 | debugfs_create_file("perf_state", 0444, | |
d32dcc6c | 2980 | d, genpd, &perf_state_fops); |
b6a1d093 TG |
2981 | } |
2982 | ||
2bd5306a MM |
2983 | return 0; |
2984 | } | |
9e9704ea | 2985 | late_initcall(genpd_debug_init); |
2bd5306a | 2986 | |
9e9704ea | 2987 | static void __exit genpd_debug_exit(void) |
2bd5306a | 2988 | { |
9e9704ea | 2989 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 2990 | } |
9e9704ea | 2991 | __exitcall(genpd_debug_exit); |
8b0510b5 | 2992 | #endif /* CONFIG_DEBUG_FS */ |