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5de363b6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f721889f RW |
2 | /* |
3 | * drivers/base/power/domain.c - Common code related to device power domains. | |
4 | * | |
5 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
f721889f | 6 | */ |
7a5bd127 JP |
7 | #define pr_fmt(fmt) "PM: " fmt |
8 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
6a0ae73d | 13 | #include <linux/pm_opp.h> |
f721889f RW |
14 | #include <linux/pm_runtime.h> |
15 | #include <linux/pm_domain.h> | |
6ff7bb0d | 16 | #include <linux/pm_qos.h> |
c11f6f5b | 17 | #include <linux/pm_clock.h> |
f721889f RW |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> | |
17b75eca RW |
20 | #include <linux/sched.h> |
21 | #include <linux/suspend.h> | |
d5e4cbfe | 22 | #include <linux/export.h> |
eb594b73 | 23 | #include <linux/cpu.h> |
718072ce | 24 | #include <linux/debugfs.h> |
d5e4cbfe | 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 | ||
49f618e1 | 127 | #define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) |
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) |
eb594b73 | 131 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
ed61e18a | 132 | #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
d716f479 | 133 | |
7a02444b | 134 | static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, |
d8600c8b | 135 | const struct generic_pm_domain *genpd) |
d716f479 LI |
136 | { |
137 | bool ret; | |
138 | ||
139 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
140 | ||
075c37d5 | 141 | /* |
7a02444b UH |
142 | * Warn once if an IRQ safe device is attached to a domain, which |
143 | * callbacks are allowed to sleep. This indicates a suboptimal | |
144 | * configuration for PM, but it doesn't matter for an always on domain. | |
075c37d5 | 145 | */ |
bcc19f69 UH |
146 | if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) |
147 | return ret; | |
148 | ||
149 | if (ret) | |
d716f479 LI |
150 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
151 | genpd->name); | |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
b3ad17c0 UH |
156 | static int genpd_runtime_suspend(struct device *dev); |
157 | ||
446d999c RK |
158 | /* |
159 | * Get the generic PM domain for a particular struct device. | |
160 | * This validates the struct device pointer, the PM domain pointer, | |
161 | * and checks that the PM domain pointer is a real generic PM domain. | |
162 | * Any failure results in NULL being returned. | |
163 | */ | |
b3ad17c0 | 164 | static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
446d999c | 165 | { |
446d999c RK |
166 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
167 | return NULL; | |
168 | ||
b3ad17c0 UH |
169 | /* A genpd's always have its ->runtime_suspend() callback assigned. */ |
170 | if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) | |
171 | return pd_to_genpd(dev->pm_domain); | |
446d999c | 172 | |
b3ad17c0 | 173 | return NULL; |
446d999c RK |
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 | 216 | #ifdef CONFIG_DEBUG_FS |
718072ce TS |
217 | static struct dentry *genpd_debugfs_dir; |
218 | ||
219 | static void genpd_debug_add(struct generic_pm_domain *genpd); | |
220 | ||
221 | static void genpd_debug_remove(struct generic_pm_domain *genpd) | |
222 | { | |
223 | struct dentry *d; | |
224 | ||
37101d3c HYW |
225 | if (!genpd_debugfs_dir) |
226 | return; | |
227 | ||
718072ce TS |
228 | d = debugfs_lookup(genpd->name, genpd_debugfs_dir); |
229 | debugfs_remove(d); | |
230 | } | |
231 | ||
afece3ab TG |
232 | static void genpd_update_accounting(struct generic_pm_domain *genpd) |
233 | { | |
bd40cbb0 | 234 | u64 delta, now; |
afece3ab | 235 | |
bd40cbb0 UH |
236 | now = ktime_get_mono_fast_ns(); |
237 | if (now <= genpd->accounting_time) | |
238 | return; | |
239 | ||
240 | delta = now - genpd->accounting_time; | |
afece3ab TG |
241 | |
242 | /* | |
243 | * If genpd->status is active, it means we are just | |
244 | * out of off and so update the idle time and vice | |
245 | * versa. | |
246 | */ | |
bd40cbb0 UH |
247 | if (genpd->status == GENPD_STATE_ON) |
248 | genpd->states[genpd->state_idx].idle_time += delta; | |
249 | else | |
250 | genpd->on_time += delta; | |
afece3ab TG |
251 | |
252 | genpd->accounting_time = now; | |
253 | } | |
254 | #else | |
718072ce TS |
255 | static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} |
256 | static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} | |
afece3ab TG |
257 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
258 | #endif | |
259 | ||
cd50c6d3 VK |
260 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
261 | unsigned int state) | |
262 | { | |
263 | struct generic_pm_domain_data *pd_data; | |
264 | struct pm_domain_data *pdd; | |
18edf49c | 265 | struct gpd_link *link; |
cd50c6d3 VK |
266 | |
267 | /* New requested state is same as Max requested state */ | |
268 | if (state == genpd->performance_state) | |
269 | return state; | |
270 | ||
271 | /* New requested state is higher than Max requested state */ | |
272 | if (state > genpd->performance_state) | |
273 | return state; | |
274 | ||
275 | /* Traverse all devices within the domain */ | |
276 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
277 | pd_data = to_gpd_data(pdd); | |
278 | ||
279 | if (pd_data->performance_state > state) | |
280 | state = pd_data->performance_state; | |
281 | } | |
282 | ||
283 | /* | |
18edf49c VK |
284 | * Traverse all sub-domains within the domain. This can be |
285 | * done without any additional locking as the link->performance_state | |
8d87ae48 | 286 | * field is protected by the parent genpd->lock, which is already taken. |
18edf49c VK |
287 | * |
288 | * Also note that link->performance_state (subdomain's performance state | |
8d87ae48 KC |
289 | * requirement to parent domain) is different from |
290 | * link->child->performance_state (current performance state requirement | |
18edf49c VK |
291 | * of the devices/sub-domains of the subdomain) and so can have a |
292 | * different value. | |
293 | * | |
294 | * Note that we also take vote from powered-off sub-domains into account | |
295 | * as the same is done for devices right now. | |
cd50c6d3 | 296 | */ |
8d87ae48 | 297 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
18edf49c VK |
298 | if (link->performance_state > state) |
299 | state = link->performance_state; | |
300 | } | |
301 | ||
cd50c6d3 VK |
302 | return state; |
303 | } | |
304 | ||
079c42a0 DO |
305 | static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, |
306 | struct generic_pm_domain *parent, | |
307 | unsigned int pstate) | |
308 | { | |
309 | if (!parent->set_performance_state) | |
310 | return pstate; | |
311 | ||
312 | return dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
313 | parent->opp_table, | |
314 | pstate); | |
315 | } | |
316 | ||
cd50c6d3 | 317 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
18edf49c | 318 | unsigned int state, int depth) |
cd50c6d3 | 319 | { |
8d87ae48 | 320 | struct generic_pm_domain *parent; |
18edf49c | 321 | struct gpd_link *link; |
8d87ae48 | 322 | int parent_state, ret; |
cd50c6d3 VK |
323 | |
324 | if (state == genpd->performance_state) | |
325 | return 0; | |
326 | ||
8d87ae48 KC |
327 | /* Propagate to parents of genpd */ |
328 | list_for_each_entry(link, &genpd->child_links, child_node) { | |
329 | parent = link->parent; | |
18edf49c | 330 | |
8d87ae48 | 331 | /* Find parent's performance state */ |
079c42a0 | 332 | ret = genpd_xlate_performance_state(genpd, parent, state); |
18edf49c VK |
333 | if (unlikely(ret < 0)) |
334 | goto err; | |
335 | ||
8d87ae48 | 336 | parent_state = ret; |
18edf49c | 337 | |
8d87ae48 | 338 | genpd_lock_nested(parent, depth + 1); |
18edf49c VK |
339 | |
340 | link->prev_performance_state = link->performance_state; | |
8d87ae48 KC |
341 | link->performance_state = parent_state; |
342 | parent_state = _genpd_reeval_performance_state(parent, | |
343 | parent_state); | |
344 | ret = _genpd_set_performance_state(parent, parent_state, depth + 1); | |
18edf49c VK |
345 | if (ret) |
346 | link->performance_state = link->prev_performance_state; | |
347 | ||
8d87ae48 | 348 | genpd_unlock(parent); |
18edf49c VK |
349 | |
350 | if (ret) | |
351 | goto err; | |
352 | } | |
353 | ||
079c42a0 DO |
354 | if (genpd->set_performance_state) { |
355 | ret = genpd->set_performance_state(genpd, state); | |
356 | if (ret) | |
357 | goto err; | |
358 | } | |
cd50c6d3 VK |
359 | |
360 | genpd->performance_state = state; | |
361 | return 0; | |
18edf49c VK |
362 | |
363 | err: | |
364 | /* Encountered an error, lets rollback */ | |
8d87ae48 KC |
365 | list_for_each_entry_continue_reverse(link, &genpd->child_links, |
366 | child_node) { | |
367 | parent = link->parent; | |
18edf49c | 368 | |
8d87ae48 | 369 | genpd_lock_nested(parent, depth + 1); |
18edf49c | 370 | |
8d87ae48 KC |
371 | parent_state = link->prev_performance_state; |
372 | link->performance_state = parent_state; | |
18edf49c | 373 | |
8d87ae48 KC |
374 | parent_state = _genpd_reeval_performance_state(parent, |
375 | parent_state); | |
376 | if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { | |
18edf49c | 377 | pr_err("%s: Failed to roll back to %d performance state\n", |
8d87ae48 | 378 | parent->name, parent_state); |
18edf49c VK |
379 | } |
380 | ||
8d87ae48 | 381 | genpd_unlock(parent); |
18edf49c VK |
382 | } |
383 | ||
384 | return ret; | |
cd50c6d3 VK |
385 | } |
386 | ||
0eef091d UH |
387 | static int genpd_set_performance_state(struct device *dev, unsigned int state) |
388 | { | |
389 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
390 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); | |
391 | unsigned int prev_state; | |
392 | int ret; | |
393 | ||
394 | prev_state = gpd_data->performance_state; | |
d97fe100 UH |
395 | if (prev_state == state) |
396 | return 0; | |
397 | ||
0eef091d UH |
398 | gpd_data->performance_state = state; |
399 | state = _genpd_reeval_performance_state(genpd, state); | |
400 | ||
401 | ret = _genpd_set_performance_state(genpd, state, 0); | |
402 | if (ret) | |
403 | gpd_data->performance_state = prev_state; | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
5937c3ce UH |
408 | static int genpd_drop_performance_state(struct device *dev) |
409 | { | |
410 | unsigned int prev_state = dev_gpd_data(dev)->performance_state; | |
411 | ||
412 | if (!genpd_set_performance_state(dev, 0)) | |
413 | return prev_state; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static void genpd_restore_performance_state(struct device *dev, | |
419 | unsigned int state) | |
420 | { | |
421 | if (state) | |
422 | genpd_set_performance_state(dev, state); | |
423 | } | |
424 | ||
42f6284a VK |
425 | /** |
426 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
427 | * domain. | |
428 | * | |
429 | * @dev: Device for which the performance-state needs to be set. | |
430 | * @state: Target performance state of the device. This can be set as 0 when the | |
431 | * device doesn't have any performance state constraints left (And so | |
432 | * the device wouldn't participate anymore to find the target | |
433 | * performance state of the genpd). | |
434 | * | |
435 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
436 | * while this routine is getting called. | |
437 | * | |
438 | * Returns 0 on success and negative error values on failures. | |
439 | */ | |
440 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
441 | { | |
442 | struct generic_pm_domain *genpd; | |
3c5a2722 | 443 | int ret = 0; |
42f6284a | 444 | |
3ea4ca92 UH |
445 | genpd = dev_to_genpd_safe(dev); |
446 | if (!genpd) | |
42f6284a VK |
447 | return -ENODEV; |
448 | ||
e757e7fa YL |
449 | if (WARN_ON(!dev->power.subsys_data || |
450 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 451 | return -EINVAL; |
42f6284a VK |
452 | |
453 | genpd_lock(genpd); | |
3c5a2722 DO |
454 | if (pm_runtime_suspended(dev)) { |
455 | dev_gpd_data(dev)->rpm_pstate = state; | |
456 | } else { | |
457 | ret = genpd_set_performance_state(dev, state); | |
458 | if (!ret) | |
459 | dev_gpd_data(dev)->rpm_pstate = 0; | |
460 | } | |
42f6284a VK |
461 | genpd_unlock(genpd); |
462 | ||
463 | return ret; | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
466 | ||
67e3242e LI |
467 | /** |
468 | * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. | |
469 | * | |
470 | * @dev: Device to handle | |
471 | * @next: impending interrupt/wakeup for the device | |
472 | * | |
473 | * | |
474 | * Allow devices to inform of the next wakeup. It's assumed that the users | |
475 | * guarantee that the genpd wouldn't be detached while this routine is getting | |
476 | * called. Additionally, it's also assumed that @dev isn't runtime suspended | |
477 | * (RPM_SUSPENDED)." | |
478 | * Although devices are expected to update the next_wakeup after the end of | |
479 | * their usecase as well, it is possible the devices themselves may not know | |
480 | * about that, so stale @next will be ignored when powering off the domain. | |
481 | */ | |
482 | void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) | |
483 | { | |
67e3242e | 484 | struct generic_pm_domain *genpd; |
9c74f2ac | 485 | struct gpd_timing_data *td; |
67e3242e LI |
486 | |
487 | genpd = dev_to_genpd_safe(dev); | |
488 | if (!genpd) | |
489 | return; | |
490 | ||
9c74f2ac UH |
491 | td = to_gpd_data(dev->power.subsys_data->domain_data)->td; |
492 | if (td) | |
493 | td->next_wakeup = next; | |
67e3242e LI |
494 | } |
495 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); | |
496 | ||
1498c503 MS |
497 | /** |
498 | * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd | |
499 | * @dev: A device that is attached to the genpd. | |
500 | * | |
501 | * This routine should typically be called for a device, at the point of when a | |
502 | * GENPD_NOTIFY_PRE_OFF notification has been sent for it. | |
503 | * | |
504 | * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no | |
505 | * valid value have been set. | |
506 | */ | |
507 | ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev) | |
508 | { | |
509 | struct generic_pm_domain *genpd; | |
510 | ||
511 | genpd = dev_to_genpd_safe(dev); | |
512 | if (!genpd) | |
513 | return KTIME_MAX; | |
514 | ||
515 | if (genpd->gd) | |
516 | return genpd->gd->next_hrtimer; | |
517 | ||
518 | return KTIME_MAX; | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer); | |
521 | ||
86e12eac | 522 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 523 | { |
fc5cbf0c | 524 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
525 | ktime_t time_start; |
526 | s64 elapsed_ns; | |
330e3932 | 527 | int ret; |
d4f81383 UH |
528 | |
529 | /* Notify consumers that we are about to power on. */ | |
330e3932 UH |
530 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
531 | GENPD_NOTIFY_PRE_ON, | |
532 | GENPD_NOTIFY_OFF, NULL); | |
d4f81383 UH |
533 | ret = notifier_to_errno(ret); |
534 | if (ret) | |
330e3932 | 535 | return ret; |
c8f0ea45 GU |
536 | |
537 | if (!genpd->power_on) | |
d4f81383 | 538 | goto out; |
c8f0ea45 | 539 | |
b2a92f35 | 540 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
d4f81383 UH |
541 | if (!timed) { |
542 | ret = genpd->power_on(genpd); | |
543 | if (ret) | |
544 | goto err; | |
545 | ||
546 | goto out; | |
547 | } | |
a4630c61 | 548 | |
c8f0ea45 GU |
549 | time_start = ktime_get(); |
550 | ret = genpd->power_on(genpd); | |
551 | if (ret) | |
d4f81383 | 552 | goto err; |
c8f0ea45 GU |
553 | |
554 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 555 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
d4f81383 | 556 | goto out; |
c8f0ea45 | 557 | |
fc5cbf0c | 558 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
6961795f | 559 | genpd->gd->max_off_time_changed = true; |
6d7d5c32 RK |
560 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
561 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 | 562 | |
d4f81383 UH |
563 | out: |
564 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); | |
565 | return 0; | |
566 | err: | |
567 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
568 | NULL); | |
c8f0ea45 GU |
569 | return ret; |
570 | } | |
571 | ||
86e12eac | 572 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 573 | { |
fc5cbf0c | 574 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
575 | ktime_t time_start; |
576 | s64 elapsed_ns; | |
330e3932 | 577 | int ret; |
d4f81383 UH |
578 | |
579 | /* Notify consumers that we are about to power off. */ | |
330e3932 UH |
580 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
581 | GENPD_NOTIFY_PRE_OFF, | |
582 | GENPD_NOTIFY_ON, NULL); | |
d4f81383 UH |
583 | ret = notifier_to_errno(ret); |
584 | if (ret) | |
330e3932 | 585 | return ret; |
c8f0ea45 GU |
586 | |
587 | if (!genpd->power_off) | |
d4f81383 UH |
588 | goto out; |
589 | ||
b2a92f35 | 590 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
d4f81383 UH |
591 | if (!timed) { |
592 | ret = genpd->power_off(genpd); | |
593 | if (ret) | |
594 | goto busy; | |
c8f0ea45 | 595 | |
d4f81383 UH |
596 | goto out; |
597 | } | |
a4630c61 | 598 | |
c8f0ea45 GU |
599 | time_start = ktime_get(); |
600 | ret = genpd->power_off(genpd); | |
0cec68a9 | 601 | if (ret) |
d4f81383 | 602 | goto busy; |
c8f0ea45 GU |
603 | |
604 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 605 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
d4f81383 | 606 | goto out; |
c8f0ea45 | 607 | |
fc5cbf0c | 608 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
6961795f | 609 | genpd->gd->max_off_time_changed = true; |
6d7d5c32 RK |
610 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
611 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 612 | |
d4f81383 UH |
613 | out: |
614 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
615 | NULL); | |
0cec68a9 | 616 | return 0; |
d4f81383 | 617 | busy: |
330e3932 | 618 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
d4f81383 | 619 | return ret; |
c8f0ea45 GU |
620 | } |
621 | ||
29e47e21 | 622 | /** |
86e12eac | 623 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 624 | * @genpd: PM domain to power off. |
29e47e21 | 625 | * |
86e12eac | 626 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
627 | * before. |
628 | */ | |
629 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
630 | { | |
631 | queue_work(pm_wq, &genpd->power_off_work); | |
632 | } | |
633 | ||
1f8728b7 UH |
634 | /** |
635 | * genpd_power_off - Remove power from a given PM domain. | |
636 | * @genpd: PM domain to power down. | |
3c64649d UH |
637 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
638 | * RPM status of the releated device is in an intermediate state, not yet turned | |
639 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
640 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
763663c9 | 641 | * @depth: nesting count for lockdep. |
1f8728b7 UH |
642 | * |
643 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
644 | * have been powered down, remove power from @genpd. | |
645 | */ | |
2da83545 UH |
646 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
647 | unsigned int depth) | |
1f8728b7 UH |
648 | { |
649 | struct pm_domain_data *pdd; | |
650 | struct gpd_link *link; | |
651 | unsigned int not_suspended = 0; | |
f63816e4 | 652 | int ret; |
1f8728b7 UH |
653 | |
654 | /* | |
655 | * Do not try to power off the domain in the following situations: | |
656 | * (1) The domain is already in the "power off" state. | |
657 | * (2) System suspend is in progress. | |
658 | */ | |
41e2c8e0 | 659 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
660 | return 0; |
661 | ||
ffaa42e8 UH |
662 | /* |
663 | * Abort power off for the PM domain in the following situations: | |
664 | * (1) The domain is configured as always on. | |
665 | * (2) When the domain has a subdomain being powered on. | |
666 | */ | |
ed61e18a LC |
667 | if (genpd_is_always_on(genpd) || |
668 | genpd_is_rpm_always_on(genpd) || | |
669 | atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
670 | return -EBUSY; |
671 | ||
e7d90cfa UH |
672 | /* |
673 | * The children must be in their deepest (powered-off) states to allow | |
674 | * the parent to be powered off. Note that, there's no need for | |
675 | * additional locking, as powering on a child, requires the parent's | |
676 | * lock to be acquired first. | |
677 | */ | |
678 | list_for_each_entry(link, &genpd->parent_links, parent_node) { | |
679 | struct generic_pm_domain *child = link->child; | |
680 | if (child->state_idx < child->state_count - 1) | |
681 | return -EBUSY; | |
682 | } | |
683 | ||
1f8728b7 | 684 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1f8728b7 UH |
685 | /* |
686 | * Do not allow PM domain to be powered off, when an IRQ safe | |
687 | * device is part of a non-IRQ safe domain. | |
688 | */ | |
689 | if (!pm_runtime_suspended(pdd->dev) || | |
7a02444b | 690 | irq_safe_dev_in_sleep_domain(pdd->dev, genpd)) |
1f8728b7 UH |
691 | not_suspended++; |
692 | } | |
693 | ||
3c64649d | 694 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
695 | return -EBUSY; |
696 | ||
697 | if (genpd->gov && genpd->gov->power_down_ok) { | |
698 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
699 | return -EAGAIN; | |
700 | } | |
701 | ||
2c9b7f87 UH |
702 | /* Default to shallowest state. */ |
703 | if (!genpd->gov) | |
704 | genpd->state_idx = 0; | |
705 | ||
f63816e4 UH |
706 | /* Don't power off, if a child domain is waiting to power on. */ |
707 | if (atomic_read(&genpd->sd_count) > 0) | |
708 | return -EBUSY; | |
1f8728b7 | 709 | |
f63816e4 | 710 | ret = _genpd_power_off(genpd, true); |
c6a113b5 LI |
711 | if (ret) { |
712 | genpd->states[genpd->state_idx].rejected++; | |
f63816e4 | 713 | return ret; |
c6a113b5 | 714 | } |
1f8728b7 | 715 | |
49f618e1 | 716 | genpd->status = GENPD_STATE_OFF; |
afece3ab | 717 | genpd_update_accounting(genpd); |
c6a113b5 | 718 | genpd->states[genpd->state_idx].usage++; |
1f8728b7 | 719 | |
8d87ae48 KC |
720 | list_for_each_entry(link, &genpd->child_links, child_node) { |
721 | genpd_sd_counter_dec(link->parent); | |
722 | genpd_lock_nested(link->parent, depth + 1); | |
723 | genpd_power_off(link->parent, false, depth + 1); | |
724 | genpd_unlock(link->parent); | |
1f8728b7 UH |
725 | } |
726 | ||
727 | return 0; | |
728 | } | |
729 | ||
5248051b | 730 | /** |
8d87ae48 | 731 | * genpd_power_on - Restore power to a given PM domain and its parents. |
5248051b | 732 | * @genpd: PM domain to power up. |
0106ef51 | 733 | * @depth: nesting count for lockdep. |
5248051b | 734 | * |
8d87ae48 | 735 | * Restore power to @genpd and all of its parents so that it is possible to |
5248051b RW |
736 | * resume a device belonging to it. |
737 | */ | |
86e12eac | 738 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 739 | { |
5063ce15 | 740 | struct gpd_link *link; |
5248051b RW |
741 | int ret = 0; |
742 | ||
41e2c8e0 | 743 | if (genpd_status_on(genpd)) |
3f241775 | 744 | return 0; |
5248051b | 745 | |
5063ce15 RW |
746 | /* |
747 | * The list is guaranteed not to change while the loop below is being | |
8d87ae48 | 748 | * executed, unless one of the parents' .power_on() callbacks fiddles |
5063ce15 RW |
749 | * with it. |
750 | */ | |
8d87ae48 KC |
751 | list_for_each_entry(link, &genpd->child_links, child_node) { |
752 | struct generic_pm_domain *parent = link->parent; | |
0106ef51 | 753 | |
8d87ae48 | 754 | genpd_sd_counter_inc(parent); |
0106ef51 | 755 | |
8d87ae48 KC |
756 | genpd_lock_nested(parent, depth + 1); |
757 | ret = genpd_power_on(parent, depth + 1); | |
758 | genpd_unlock(parent); | |
5248051b | 759 | |
5063ce15 | 760 | if (ret) { |
8d87ae48 | 761 | genpd_sd_counter_dec(parent); |
9e08cf42 | 762 | goto err; |
5063ce15 | 763 | } |
5248051b RW |
764 | } |
765 | ||
86e12eac | 766 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
767 | if (ret) |
768 | goto err; | |
5248051b | 769 | |
49f618e1 | 770 | genpd->status = GENPD_STATE_ON; |
afece3ab TG |
771 | genpd_update_accounting(genpd); |
772 | ||
3f241775 | 773 | return 0; |
9e08cf42 RW |
774 | |
775 | err: | |
29e47e21 | 776 | list_for_each_entry_continue_reverse(link, |
8d87ae48 KC |
777 | &genpd->child_links, |
778 | child_node) { | |
779 | genpd_sd_counter_dec(link->parent); | |
780 | genpd_lock_nested(link->parent, depth + 1); | |
781 | genpd_power_off(link->parent, false, depth + 1); | |
782 | genpd_unlock(link->parent); | |
29e47e21 | 783 | } |
9e08cf42 | 784 | |
3f241775 RW |
785 | return ret; |
786 | } | |
787 | ||
ea71c596 UH |
788 | static int genpd_dev_pm_start(struct device *dev) |
789 | { | |
790 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
791 | ||
792 | return genpd_start_dev(genpd, dev); | |
793 | } | |
794 | ||
6ff7bb0d RW |
795 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
796 | unsigned long val, void *ptr) | |
797 | { | |
798 | struct generic_pm_domain_data *gpd_data; | |
799 | struct device *dev; | |
800 | ||
801 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 802 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
803 | |
804 | for (;;) { | |
f38d1a6d | 805 | struct generic_pm_domain *genpd = ERR_PTR(-ENODATA); |
6ff7bb0d | 806 | struct pm_domain_data *pdd; |
66d29d80 | 807 | struct gpd_timing_data *td; |
6ff7bb0d RW |
808 | |
809 | spin_lock_irq(&dev->power.lock); | |
810 | ||
811 | pdd = dev->power.subsys_data ? | |
812 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 813 | if (pdd) { |
66d29d80 | 814 | td = to_gpd_data(pdd)->td; |
f38d1a6d | 815 | if (td) { |
66d29d80 | 816 | td->constraint_changed = true; |
f38d1a6d UH |
817 | genpd = dev_to_genpd(dev); |
818 | } | |
6ff7bb0d RW |
819 | } |
820 | ||
821 | spin_unlock_irq(&dev->power.lock); | |
822 | ||
823 | if (!IS_ERR(genpd)) { | |
35241d12 | 824 | genpd_lock(genpd); |
f38d1a6d | 825 | genpd->gd->max_off_time_changed = true; |
35241d12 | 826 | genpd_unlock(genpd); |
6ff7bb0d RW |
827 | } |
828 | ||
829 | dev = dev->parent; | |
830 | if (!dev || dev->power.ignore_children) | |
831 | break; | |
832 | } | |
833 | ||
834 | return NOTIFY_DONE; | |
835 | } | |
836 | ||
f721889f RW |
837 | /** |
838 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
839 | * @work: Work structure used for scheduling the execution of this function. | |
840 | */ | |
841 | static void genpd_power_off_work_fn(struct work_struct *work) | |
842 | { | |
843 | struct generic_pm_domain *genpd; | |
844 | ||
845 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
846 | ||
35241d12 | 847 | genpd_lock(genpd); |
2da83545 | 848 | genpd_power_off(genpd, false, 0); |
35241d12 | 849 | genpd_unlock(genpd); |
f721889f RW |
850 | } |
851 | ||
54eeddbf UH |
852 | /** |
853 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
854 | * @dev: Device to handle. | |
855 | */ | |
856 | static int __genpd_runtime_suspend(struct device *dev) | |
857 | { | |
858 | int (*cb)(struct device *__dev); | |
859 | ||
860 | if (dev->type && dev->type->pm) | |
861 | cb = dev->type->pm->runtime_suspend; | |
862 | else if (dev->class && dev->class->pm) | |
863 | cb = dev->class->pm->runtime_suspend; | |
864 | else if (dev->bus && dev->bus->pm) | |
865 | cb = dev->bus->pm->runtime_suspend; | |
866 | else | |
867 | cb = NULL; | |
868 | ||
869 | if (!cb && dev->driver && dev->driver->pm) | |
870 | cb = dev->driver->pm->runtime_suspend; | |
871 | ||
872 | return cb ? cb(dev) : 0; | |
873 | } | |
874 | ||
875 | /** | |
876 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
877 | * @dev: Device to handle. | |
878 | */ | |
879 | static int __genpd_runtime_resume(struct device *dev) | |
880 | { | |
881 | int (*cb)(struct device *__dev); | |
882 | ||
883 | if (dev->type && dev->type->pm) | |
884 | cb = dev->type->pm->runtime_resume; | |
885 | else if (dev->class && dev->class->pm) | |
886 | cb = dev->class->pm->runtime_resume; | |
887 | else if (dev->bus && dev->bus->pm) | |
888 | cb = dev->bus->pm->runtime_resume; | |
889 | else | |
890 | cb = NULL; | |
891 | ||
892 | if (!cb && dev->driver && dev->driver->pm) | |
893 | cb = dev->driver->pm->runtime_resume; | |
894 | ||
895 | return cb ? cb(dev) : 0; | |
896 | } | |
897 | ||
f721889f | 898 | /** |
795bd2e7 | 899 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
900 | * @dev: Device to suspend. |
901 | * | |
902 | * Carry out a runtime suspend of a device under the assumption that its | |
903 | * pm_domain field points to the domain member of an object of type | |
904 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
905 | */ | |
795bd2e7 | 906 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
907 | { |
908 | struct generic_pm_domain *genpd; | |
9df3921e | 909 | bool (*suspend_ok)(struct device *__dev); |
5937c3ce | 910 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
66d29d80 | 911 | struct gpd_timing_data *td = gpd_data->td; |
ffe12855 | 912 | bool runtime_pm = pm_runtime_enabled(dev); |
3b84bf3c | 913 | ktime_t time_start = 0; |
2b1d88cd | 914 | s64 elapsed_ns; |
d5e4cbfe | 915 | int ret; |
f721889f RW |
916 | |
917 | dev_dbg(dev, "%s()\n", __func__); | |
918 | ||
5248051b RW |
919 | genpd = dev_to_genpd(dev); |
920 | if (IS_ERR(genpd)) | |
f721889f RW |
921 | return -EINVAL; |
922 | ||
ffe12855 UH |
923 | /* |
924 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
925 | * callbacks for other purposes than runtime PM. In those scenarios | |
926 | * runtime PM is disabled. Under these circumstances, we shall skip | |
927 | * validating/measuring the PM QoS latency. | |
928 | */ | |
9df3921e UH |
929 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
930 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
931 | return -EBUSY; |
932 | ||
2b1d88cd | 933 | /* Measure suspend latency. */ |
3b84bf3c | 934 | if (td && runtime_pm) |
ffe12855 | 935 | time_start = ktime_get(); |
2b1d88cd | 936 | |
54eeddbf | 937 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
938 | if (ret) |
939 | return ret; | |
17b75eca | 940 | |
2b1d88cd | 941 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 942 | if (ret) { |
54eeddbf | 943 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
944 | return ret; |
945 | } | |
946 | ||
2b1d88cd | 947 | /* Update suspend latency value if the measured time exceeds it. */ |
3b84bf3c | 948 | if (td && runtime_pm) { |
ffe12855 | 949 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
3b84bf3c | 950 | if (elapsed_ns > td->suspend_latency_ns) { |
ffe12855 UH |
951 | td->suspend_latency_ns = elapsed_ns; |
952 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
953 | elapsed_ns); | |
f38d1a6d | 954 | genpd->gd->max_off_time_changed = true; |
ffe12855 UH |
955 | td->constraint_changed = true; |
956 | } | |
2b1d88cd UH |
957 | } |
958 | ||
0aa2a221 | 959 | /* |
d716f479 LI |
960 | * If power.irq_safe is set, this routine may be run with |
961 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 962 | */ |
7a02444b | 963 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
0aa2a221 RW |
964 | return 0; |
965 | ||
35241d12 | 966 | genpd_lock(genpd); |
2da83545 | 967 | genpd_power_off(genpd, true, 0); |
ae8ac196 | 968 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
35241d12 | 969 | genpd_unlock(genpd); |
f721889f RW |
970 | |
971 | return 0; | |
972 | } | |
973 | ||
f721889f | 974 | /** |
795bd2e7 | 975 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
976 | * @dev: Device to resume. |
977 | * | |
978 | * Carry out a runtime resume of a device under the assumption that its | |
979 | * pm_domain field points to the domain member of an object of type | |
980 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
981 | */ | |
795bd2e7 | 982 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
983 | { |
984 | struct generic_pm_domain *genpd; | |
5937c3ce | 985 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
66d29d80 | 986 | struct gpd_timing_data *td = gpd_data->td; |
3b84bf3c UH |
987 | bool timed = td && pm_runtime_enabled(dev); |
988 | ktime_t time_start = 0; | |
2b1d88cd | 989 | s64 elapsed_ns; |
f721889f RW |
990 | int ret; |
991 | ||
992 | dev_dbg(dev, "%s()\n", __func__); | |
993 | ||
5248051b RW |
994 | genpd = dev_to_genpd(dev); |
995 | if (IS_ERR(genpd)) | |
f721889f RW |
996 | return -EINVAL; |
997 | ||
d716f479 LI |
998 | /* |
999 | * As we don't power off a non IRQ safe domain, which holds | |
1000 | * an IRQ safe device, we don't need to restore power to it. | |
1001 | */ | |
a294237a | 1002 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
ba2bbfbf | 1003 | goto out; |
0aa2a221 | 1004 | |
35241d12 | 1005 | genpd_lock(genpd); |
ae8ac196 | 1006 | genpd_restore_performance_state(dev, gpd_data->rpm_pstate); |
86e12eac | 1007 | ret = genpd_power_on(genpd, 0); |
35241d12 | 1008 | genpd_unlock(genpd); |
c6d22b37 | 1009 | |
ba2bbfbf UH |
1010 | if (ret) |
1011 | return ret; | |
c6d22b37 | 1012 | |
ba2bbfbf | 1013 | out: |
2b1d88cd | 1014 | /* Measure resume latency. */ |
3b84bf3c | 1015 | if (timed) |
2b1d88cd UH |
1016 | time_start = ktime_get(); |
1017 | ||
076395ca LP |
1018 | ret = genpd_start_dev(genpd, dev); |
1019 | if (ret) | |
1020 | goto err_poweroff; | |
1021 | ||
54eeddbf | 1022 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
1023 | if (ret) |
1024 | goto err_stop; | |
2b1d88cd UH |
1025 | |
1026 | /* Update resume latency value if the measured time exceeds it. */ | |
3b84bf3c | 1027 | if (timed) { |
2b1d88cd | 1028 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
3b84bf3c | 1029 | if (elapsed_ns > td->resume_latency_ns) { |
2b1d88cd UH |
1030 | td->resume_latency_ns = elapsed_ns; |
1031 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
1032 | elapsed_ns); | |
f38d1a6d | 1033 | genpd->gd->max_off_time_changed = true; |
2b1d88cd UH |
1034 | td->constraint_changed = true; |
1035 | } | |
1036 | } | |
17b75eca | 1037 | |
f721889f | 1038 | return 0; |
076395ca LP |
1039 | |
1040 | err_stop: | |
1041 | genpd_stop_dev(genpd, dev); | |
1042 | err_poweroff: | |
6dc466d3 | 1043 | if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { |
35241d12 | 1044 | genpd_lock(genpd); |
2da83545 | 1045 | genpd_power_off(genpd, true, 0); |
ae8ac196 | 1046 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
35241d12 | 1047 | genpd_unlock(genpd); |
076395ca LP |
1048 | } |
1049 | ||
1050 | return ret; | |
f721889f RW |
1051 | } |
1052 | ||
39ac5ba5 TB |
1053 | static bool pd_ignore_unused; |
1054 | static int __init pd_ignore_unused_setup(char *__unused) | |
1055 | { | |
1056 | pd_ignore_unused = true; | |
1057 | return 1; | |
1058 | } | |
1059 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
1060 | ||
17f2ae7f | 1061 | /** |
86e12eac | 1062 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 1063 | */ |
86e12eac | 1064 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
1065 | { |
1066 | struct generic_pm_domain *genpd; | |
1067 | ||
39ac5ba5 TB |
1068 | if (pd_ignore_unused) { |
1069 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 1070 | return 0; |
39ac5ba5 TB |
1071 | } |
1072 | ||
17f2ae7f RW |
1073 | mutex_lock(&gpd_list_lock); |
1074 | ||
1075 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
1076 | genpd_queue_power_off_work(genpd); | |
1077 | ||
1078 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 1079 | |
2fe71dcd UH |
1080 | return 0; |
1081 | } | |
86e12eac | 1082 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 1083 | |
0159ec67 JH |
1084 | #ifdef CONFIG_PM_SLEEP |
1085 | ||
596ba34b | 1086 | /** |
8d87ae48 | 1087 | * genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
596ba34b | 1088 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
1089 | * @use_lock: use the lock. |
1090 | * @depth: nesting count for lockdep. | |
596ba34b RW |
1091 | * |
1092 | * Check if the given PM domain can be powered off (during system suspend or | |
8d87ae48 | 1093 | * hibernation) and do that if so. Also, in that case propagate to its parents. |
596ba34b | 1094 | * |
77f827de | 1095 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1096 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1097 | * these cases the lock must be held. | |
596ba34b | 1098 | */ |
0883ac03 UH |
1099 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
1100 | unsigned int depth) | |
596ba34b | 1101 | { |
5063ce15 | 1102 | struct gpd_link *link; |
596ba34b | 1103 | |
ffaa42e8 | 1104 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
1105 | return; |
1106 | ||
c4bb3160 RW |
1107 | if (genpd->suspended_count != genpd->device_count |
1108 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
1109 | return; |
1110 | ||
e7d90cfa UH |
1111 | /* Check that the children are in their deepest (powered-off) state. */ |
1112 | list_for_each_entry(link, &genpd->parent_links, parent_node) { | |
1113 | struct generic_pm_domain *child = link->child; | |
1114 | if (child->state_idx < child->state_count - 1) | |
1115 | return; | |
1116 | } | |
1117 | ||
fc5cbf0c AH |
1118 | /* Choose the deepest state when suspending */ |
1119 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
1120 | if (_genpd_power_off(genpd, false)) |
1121 | return; | |
596ba34b | 1122 | |
49f618e1 | 1123 | genpd->status = GENPD_STATE_OFF; |
5063ce15 | 1124 | |
8d87ae48 KC |
1125 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1126 | genpd_sd_counter_dec(link->parent); | |
0883ac03 UH |
1127 | |
1128 | if (use_lock) | |
8d87ae48 | 1129 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1130 | |
8d87ae48 | 1131 | genpd_sync_power_off(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1132 | |
1133 | if (use_lock) | |
8d87ae48 | 1134 | genpd_unlock(link->parent); |
596ba34b RW |
1135 | } |
1136 | } | |
1137 | ||
802d8b49 | 1138 | /** |
8d87ae48 | 1139 | * genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
802d8b49 | 1140 | * @genpd: PM domain to power on. |
0883ac03 UH |
1141 | * @use_lock: use the lock. |
1142 | * @depth: nesting count for lockdep. | |
802d8b49 | 1143 | * |
77f827de | 1144 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1145 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1146 | * these cases the lock must be held. | |
802d8b49 | 1147 | */ |
0883ac03 UH |
1148 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1149 | unsigned int depth) | |
802d8b49 RW |
1150 | { |
1151 | struct gpd_link *link; | |
1152 | ||
41e2c8e0 | 1153 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1154 | return; |
1155 | ||
8d87ae48 KC |
1156 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1157 | genpd_sd_counter_inc(link->parent); | |
0883ac03 UH |
1158 | |
1159 | if (use_lock) | |
8d87ae48 | 1160 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1161 | |
8d87ae48 | 1162 | genpd_sync_power_on(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1163 | |
1164 | if (use_lock) | |
8d87ae48 | 1165 | genpd_unlock(link->parent); |
802d8b49 RW |
1166 | } |
1167 | ||
86e12eac | 1168 | _genpd_power_on(genpd, false); |
49f618e1 | 1169 | genpd->status = GENPD_STATE_ON; |
802d8b49 RW |
1170 | } |
1171 | ||
596ba34b | 1172 | /** |
9e9704ea | 1173 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1174 | * @dev: Device to start the transition of. |
1175 | * | |
1176 | * Start a power transition of a device (during a system-wide power transition) | |
1177 | * under the assumption that its pm_domain field points to the domain member of | |
1178 | * an object of type struct generic_pm_domain representing a PM domain | |
1179 | * consisting of I/O devices. | |
1180 | */ | |
9e9704ea | 1181 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1182 | { |
1183 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1184 | int ret; |
596ba34b RW |
1185 | |
1186 | dev_dbg(dev, "%s()\n", __func__); | |
1187 | ||
1188 | genpd = dev_to_genpd(dev); | |
1189 | if (IS_ERR(genpd)) | |
1190 | return -EINVAL; | |
1191 | ||
35241d12 | 1192 | genpd_lock(genpd); |
596ba34b | 1193 | |
39dd0f23 | 1194 | if (genpd->prepared_count++ == 0) |
65533bbf | 1195 | genpd->suspended_count = 0; |
17b75eca | 1196 | |
35241d12 | 1197 | genpd_unlock(genpd); |
596ba34b | 1198 | |
b6c10c84 | 1199 | ret = pm_generic_prepare(dev); |
5241ab40 | 1200 | if (ret < 0) { |
35241d12 | 1201 | genpd_lock(genpd); |
b6c10c84 | 1202 | |
39dd0f23 | 1203 | genpd->prepared_count--; |
b6c10c84 | 1204 | |
35241d12 | 1205 | genpd_unlock(genpd); |
b6c10c84 | 1206 | } |
17b75eca | 1207 | |
5241ab40 UH |
1208 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1209 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1210 | } |
1211 | ||
0496c8ae | 1212 | /** |
10da6542 MP |
1213 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1214 | * I/O pm domain. | |
0496c8ae | 1215 | * @dev: Device to suspend. |
615db6d9 SG |
1216 | * @suspend_noirq: Generic suspend_noirq callback. |
1217 | * @resume_noirq: Generic resume_noirq callback. | |
0496c8ae RW |
1218 | * |
1219 | * Stop the device and remove power from the domain if all devices in it have | |
1220 | * been stopped. | |
1221 | */ | |
615db6d9 SG |
1222 | static int genpd_finish_suspend(struct device *dev, |
1223 | int (*suspend_noirq)(struct device *dev), | |
1224 | int (*resume_noirq)(struct device *dev)) | |
0496c8ae RW |
1225 | { |
1226 | struct generic_pm_domain *genpd; | |
a935424b | 1227 | int ret = 0; |
0496c8ae | 1228 | |
0496c8ae RW |
1229 | genpd = dev_to_genpd(dev); |
1230 | if (IS_ERR(genpd)) | |
1231 | return -EINVAL; | |
596ba34b | 1232 | |
615db6d9 | 1233 | ret = suspend_noirq(dev); |
10da6542 MP |
1234 | if (ret) |
1235 | return ret; | |
1236 | ||
4e1d9a73 | 1237 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
a935424b UH |
1238 | return 0; |
1239 | ||
17218e00 RW |
1240 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1241 | !pm_runtime_status_suspended(dev)) { | |
1242 | ret = genpd_stop_dev(genpd, dev); | |
a935424b | 1243 | if (ret) { |
615db6d9 | 1244 | resume_noirq(dev); |
122a2237 | 1245 | return ret; |
a935424b | 1246 | } |
122a2237 UH |
1247 | } |
1248 | ||
0883ac03 | 1249 | genpd_lock(genpd); |
596ba34b | 1250 | genpd->suspended_count++; |
0883ac03 UH |
1251 | genpd_sync_power_off(genpd, true, 0); |
1252 | genpd_unlock(genpd); | |
596ba34b RW |
1253 | |
1254 | return 0; | |
1255 | } | |
1256 | ||
10da6542 | 1257 | /** |
9e9704ea | 1258 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1259 | * @dev: Device to suspend. |
1260 | * | |
1261 | * Stop the device and remove power from the domain if all devices in it have | |
1262 | * been stopped. | |
1263 | */ | |
9e9704ea | 1264 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1265 | { |
1266 | dev_dbg(dev, "%s()\n", __func__); | |
1267 | ||
615db6d9 SG |
1268 | return genpd_finish_suspend(dev, |
1269 | pm_generic_suspend_noirq, | |
1270 | pm_generic_resume_noirq); | |
10da6542 MP |
1271 | } |
1272 | ||
596ba34b | 1273 | /** |
d9cc34fe | 1274 | * genpd_finish_resume - Completion of resume of device in an I/O PM domain. |
596ba34b | 1275 | * @dev: Device to resume. |
d9cc34fe | 1276 | * @resume_noirq: Generic resume_noirq callback. |
596ba34b | 1277 | * |
0496c8ae | 1278 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1279 | */ |
d9cc34fe SG |
1280 | static int genpd_finish_resume(struct device *dev, |
1281 | int (*resume_noirq)(struct device *dev)) | |
596ba34b RW |
1282 | { |
1283 | struct generic_pm_domain *genpd; | |
a935424b | 1284 | int ret; |
596ba34b RW |
1285 | |
1286 | dev_dbg(dev, "%s()\n", __func__); | |
1287 | ||
1288 | genpd = dev_to_genpd(dev); | |
1289 | if (IS_ERR(genpd)) | |
1290 | return -EINVAL; | |
1291 | ||
4e1d9a73 | 1292 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
d9cc34fe | 1293 | return resume_noirq(dev); |
596ba34b | 1294 | |
0883ac03 UH |
1295 | genpd_lock(genpd); |
1296 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1297 | genpd->suspended_count--; |
0883ac03 | 1298 | genpd_unlock(genpd); |
596ba34b | 1299 | |
17218e00 RW |
1300 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1301 | !pm_runtime_status_suspended(dev)) { | |
1302 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1303 | if (ret) |
1304 | return ret; | |
1305 | } | |
122a2237 | 1306 | |
a935424b | 1307 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1308 | } |
1309 | ||
d9cc34fe SG |
1310 | /** |
1311 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. | |
1312 | * @dev: Device to resume. | |
1313 | * | |
1314 | * Restore power to the device's PM domain, if necessary, and start the device. | |
1315 | */ | |
1316 | static int genpd_resume_noirq(struct device *dev) | |
1317 | { | |
1318 | dev_dbg(dev, "%s()\n", __func__); | |
1319 | ||
1320 | return genpd_finish_resume(dev, pm_generic_resume_noirq); | |
1321 | } | |
1322 | ||
0496c8ae | 1323 | /** |
9e9704ea | 1324 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1325 | * @dev: Device to freeze. |
1326 | * | |
1327 | * Carry out a late freeze of a device under the assumption that its | |
1328 | * pm_domain field points to the domain member of an object of type | |
1329 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1330 | * devices. | |
1331 | */ | |
9e9704ea | 1332 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1333 | { |
596ba34b RW |
1334 | dev_dbg(dev, "%s()\n", __func__); |
1335 | ||
ebb486be SG |
1336 | return genpd_finish_suspend(dev, |
1337 | pm_generic_freeze_noirq, | |
1338 | pm_generic_thaw_noirq); | |
0496c8ae | 1339 | } |
596ba34b | 1340 | |
0496c8ae | 1341 | /** |
9e9704ea | 1342 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1343 | * @dev: Device to thaw. |
1344 | * | |
1345 | * Start the device, unless power has been removed from the domain already | |
1346 | * before the system transition. | |
1347 | */ | |
9e9704ea | 1348 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1349 | { |
0496c8ae | 1350 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1351 | |
ebb486be | 1352 | return genpd_finish_resume(dev, pm_generic_thaw_noirq); |
10da6542 MP |
1353 | } |
1354 | ||
1355 | /** | |
9e9704ea | 1356 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1357 | * I/O PM domain. |
1358 | * @dev: Device to poweroff. | |
1359 | * | |
1360 | * Stop the device and remove power from the domain if all devices in it have | |
1361 | * been stopped. | |
1362 | */ | |
9e9704ea | 1363 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1364 | { |
1365 | dev_dbg(dev, "%s()\n", __func__); | |
1366 | ||
615db6d9 SG |
1367 | return genpd_finish_suspend(dev, |
1368 | pm_generic_poweroff_noirq, | |
1369 | pm_generic_restore_noirq); | |
596ba34b RW |
1370 | } |
1371 | ||
596ba34b | 1372 | /** |
9e9704ea | 1373 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1374 | * @dev: Device to resume. |
1375 | * | |
0496c8ae RW |
1376 | * Make sure the domain will be in the same power state as before the |
1377 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1378 | */ |
9e9704ea | 1379 | static int genpd_restore_noirq(struct device *dev) |
596ba34b | 1380 | { |
596ba34b RW |
1381 | dev_dbg(dev, "%s()\n", __func__); |
1382 | ||
d9cc34fe | 1383 | return genpd_finish_resume(dev, pm_generic_restore_noirq); |
596ba34b RW |
1384 | } |
1385 | ||
1386 | /** | |
9e9704ea | 1387 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1388 | * @dev: Device to complete the transition of. |
1389 | * | |
1390 | * Complete a power transition of a device (during a system-wide power | |
1391 | * transition) under the assumption that its pm_domain field points to the | |
1392 | * domain member of an object of type struct generic_pm_domain representing | |
1393 | * a power domain consisting of I/O devices. | |
1394 | */ | |
9e9704ea | 1395 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1396 | { |
1397 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1398 | |
1399 | dev_dbg(dev, "%s()\n", __func__); | |
1400 | ||
1401 | genpd = dev_to_genpd(dev); | |
1402 | if (IS_ERR(genpd)) | |
1403 | return; | |
1404 | ||
4d23a5e8 UH |
1405 | pm_generic_complete(dev); |
1406 | ||
35241d12 | 1407 | genpd_lock(genpd); |
596ba34b | 1408 | |
39dd0f23 | 1409 | genpd->prepared_count--; |
4d23a5e8 UH |
1410 | if (!genpd->prepared_count) |
1411 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1412 | |
35241d12 | 1413 | genpd_unlock(genpd); |
596ba34b RW |
1414 | } |
1415 | ||
fc519890 | 1416 | static void genpd_switch_state(struct device *dev, bool suspend) |
77f827de RW |
1417 | { |
1418 | struct generic_pm_domain *genpd; | |
b9795a3e | 1419 | bool use_lock; |
77f827de | 1420 | |
fe0c2baa UH |
1421 | genpd = dev_to_genpd_safe(dev); |
1422 | if (!genpd) | |
77f827de RW |
1423 | return; |
1424 | ||
b9795a3e UH |
1425 | use_lock = genpd_is_irq_safe(genpd); |
1426 | ||
1427 | if (use_lock) | |
1428 | genpd_lock(genpd); | |
1429 | ||
77f827de RW |
1430 | if (suspend) { |
1431 | genpd->suspended_count++; | |
b9795a3e | 1432 | genpd_sync_power_off(genpd, use_lock, 0); |
77f827de | 1433 | } else { |
b9795a3e | 1434 | genpd_sync_power_on(genpd, use_lock, 0); |
77f827de RW |
1435 | genpd->suspended_count--; |
1436 | } | |
b9795a3e UH |
1437 | |
1438 | if (use_lock) | |
1439 | genpd_unlock(genpd); | |
77f827de | 1440 | } |
d47e6464 | 1441 | |
fc519890 UH |
1442 | /** |
1443 | * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev | |
1444 | * @dev: The device that is attached to the genpd, that can be suspended. | |
1445 | * | |
1446 | * This routine should typically be called for a device that needs to be | |
b9795a3e UH |
1447 | * suspended during the syscore suspend phase. It may also be called during |
1448 | * suspend-to-idle to suspend a corresponding CPU device that is attached to a | |
1449 | * genpd. | |
fc519890 UH |
1450 | */ |
1451 | void dev_pm_genpd_suspend(struct device *dev) | |
d47e6464 | 1452 | { |
fc519890 | 1453 | genpd_switch_state(dev, true); |
d47e6464 | 1454 | } |
fc519890 | 1455 | EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); |
d47e6464 | 1456 | |
fc519890 UH |
1457 | /** |
1458 | * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev | |
1459 | * @dev: The device that is attached to the genpd, which needs to be resumed. | |
1460 | * | |
1461 | * This routine should typically be called for a device that needs to be resumed | |
b9795a3e UH |
1462 | * during the syscore resume phase. It may also be called during suspend-to-idle |
1463 | * to resume a corresponding CPU device that is attached to a genpd. | |
fc519890 UH |
1464 | */ |
1465 | void dev_pm_genpd_resume(struct device *dev) | |
d47e6464 | 1466 | { |
fc519890 | 1467 | genpd_switch_state(dev, false); |
d47e6464 | 1468 | } |
fc519890 | 1469 | EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); |
77f827de | 1470 | |
d30d819d | 1471 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1472 | |
9e9704ea UH |
1473 | #define genpd_prepare NULL |
1474 | #define genpd_suspend_noirq NULL | |
1475 | #define genpd_resume_noirq NULL | |
1476 | #define genpd_freeze_noirq NULL | |
1477 | #define genpd_thaw_noirq NULL | |
1478 | #define genpd_poweroff_noirq NULL | |
1479 | #define genpd_restore_noirq NULL | |
1480 | #define genpd_complete NULL | |
596ba34b RW |
1481 | |
1482 | #endif /* CONFIG_PM_SLEEP */ | |
1483 | ||
66d29d80 UH |
1484 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1485 | bool has_governor) | |
1d5fcfec RW |
1486 | { |
1487 | struct generic_pm_domain_data *gpd_data; | |
66d29d80 | 1488 | struct gpd_timing_data *td; |
3e235685 UH |
1489 | int ret; |
1490 | ||
1491 | ret = dev_pm_get_subsys_data(dev); | |
1492 | if (ret) | |
1493 | return ERR_PTR(ret); | |
1d5fcfec RW |
1494 | |
1495 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1496 | if (!gpd_data) { |
1497 | ret = -ENOMEM; | |
1498 | goto err_put; | |
1499 | } | |
1d5fcfec | 1500 | |
f104e1e5 | 1501 | gpd_data->base.dev = dev; |
f104e1e5 UH |
1502 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1503 | ||
66d29d80 UH |
1504 | /* Allocate data used by a governor. */ |
1505 | if (has_governor) { | |
1506 | td = kzalloc(sizeof(*td), GFP_KERNEL); | |
1507 | if (!td) { | |
1508 | ret = -ENOMEM; | |
1509 | goto err_free; | |
1510 | } | |
f104e1e5 | 1511 | |
66d29d80 UH |
1512 | td->constraint_changed = true; |
1513 | td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; | |
9c74f2ac | 1514 | td->next_wakeup = KTIME_MAX; |
66d29d80 | 1515 | gpd_data->td = td; |
f104e1e5 UH |
1516 | } |
1517 | ||
66d29d80 UH |
1518 | spin_lock_irq(&dev->power.lock); |
1519 | ||
1520 | if (dev->power.subsys_data->domain_data) | |
1521 | ret = -EINVAL; | |
1522 | else | |
1523 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1524 | |
1525 | spin_unlock_irq(&dev->power.lock); | |
1526 | ||
66d29d80 UH |
1527 | if (ret) |
1528 | goto err_free; | |
1529 | ||
1d5fcfec | 1530 | return gpd_data; |
3e235685 | 1531 | |
f104e1e5 | 1532 | err_free: |
66d29d80 | 1533 | kfree(gpd_data->td); |
f104e1e5 | 1534 | kfree(gpd_data); |
3e235685 UH |
1535 | err_put: |
1536 | dev_pm_put_subsys_data(dev); | |
1537 | return ERR_PTR(ret); | |
1d5fcfec RW |
1538 | } |
1539 | ||
49d400c7 UH |
1540 | static void genpd_free_dev_data(struct device *dev, |
1541 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1542 | { |
f104e1e5 UH |
1543 | spin_lock_irq(&dev->power.lock); |
1544 | ||
f104e1e5 UH |
1545 | dev->power.subsys_data->domain_data = NULL; |
1546 | ||
1547 | spin_unlock_irq(&dev->power.lock); | |
1548 | ||
66d29d80 | 1549 | kfree(gpd_data->td); |
1d5fcfec | 1550 | kfree(gpd_data); |
3e235685 | 1551 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1552 | } |
1553 | ||
b24e1965 UH |
1554 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1555 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1556 | { |
1557 | struct gpd_link *link; | |
1558 | ||
1559 | if (!genpd_is_cpu_domain(genpd)) | |
1560 | return; | |
1561 | ||
8d87ae48 KC |
1562 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1563 | struct generic_pm_domain *parent = link->parent; | |
eb594b73 | 1564 | |
8d87ae48 KC |
1565 | genpd_lock_nested(parent, depth + 1); |
1566 | genpd_update_cpumask(parent, cpu, set, depth + 1); | |
1567 | genpd_unlock(parent); | |
eb594b73 UH |
1568 | } |
1569 | ||
1570 | if (set) | |
1571 | cpumask_set_cpu(cpu, genpd->cpus); | |
1572 | else | |
1573 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1574 | } | |
1575 | ||
b24e1965 UH |
1576 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1577 | { | |
1578 | if (cpu >= 0) | |
1579 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1580 | } | |
1581 | ||
1582 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1583 | { | |
1584 | if (cpu >= 0) | |
1585 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1586 | } | |
1587 | ||
1588 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1589 | { |
1590 | int cpu; | |
1591 | ||
1592 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1593 | return -1; |
eb594b73 UH |
1594 | |
1595 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1596 | if (get_cpu_device(cpu) == dev) |
1597 | return cpu; | |
eb594b73 | 1598 | } |
eb594b73 | 1599 | |
b24e1965 | 1600 | return -1; |
eb594b73 UH |
1601 | } |
1602 | ||
f9ccd7c3 UH |
1603 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1604 | struct device *base_dev) | |
f721889f | 1605 | { |
f38d1a6d | 1606 | struct genpd_governor_data *gd = genpd->gd; |
c0356db7 | 1607 | struct generic_pm_domain_data *gpd_data; |
f9ccd7c3 | 1608 | int ret; |
f721889f RW |
1609 | |
1610 | dev_dbg(dev, "%s()\n", __func__); | |
1611 | ||
1612 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1613 | return -EINVAL; | |
1614 | ||
f38d1a6d | 1615 | gpd_data = genpd_alloc_dev_data(dev, gd); |
3e235685 UH |
1616 | if (IS_ERR(gpd_data)) |
1617 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1618 | |
f9ccd7c3 | 1619 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
b24e1965 | 1620 | |
b472c2fa UH |
1621 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1622 | if (ret) | |
1623 | goto out; | |
d79b6fe1 | 1624 | |
2071ac98 JW |
1625 | genpd_lock(genpd); |
1626 | ||
f9ccd7c3 | 1627 | genpd_set_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1628 | dev_pm_domain_set(dev, &genpd->domain); |
1629 | ||
14b53064 | 1630 | genpd->device_count++; |
f38d1a6d UH |
1631 | if (gd) |
1632 | gd->max_off_time_changed = true; | |
14b53064 | 1633 | |
1d5fcfec | 1634 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1635 | |
35241d12 | 1636 | genpd_unlock(genpd); |
2071ac98 | 1637 | out: |
c0356db7 UH |
1638 | if (ret) |
1639 | genpd_free_dev_data(dev, gpd_data); | |
1640 | else | |
0b07ee94 VK |
1641 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
1642 | DEV_PM_QOS_RESUME_LATENCY); | |
1d5fcfec | 1643 | |
f721889f RW |
1644 | return ret; |
1645 | } | |
19efa5ff JH |
1646 | |
1647 | /** | |
1a7a6707 | 1648 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1649 | * @genpd: PM domain to add the device to. |
1650 | * @dev: Device to be added. | |
19efa5ff | 1651 | */ |
1a7a6707 | 1652 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1653 | { |
1654 | int ret; | |
1655 | ||
1656 | mutex_lock(&gpd_list_lock); | |
f9ccd7c3 | 1657 | ret = genpd_add_device(genpd, dev, dev); |
19efa5ff JH |
1658 | mutex_unlock(&gpd_list_lock); |
1659 | ||
1660 | return ret; | |
1661 | } | |
1a7a6707 | 1662 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1663 | |
85168d56 UH |
1664 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1665 | struct device *dev) | |
f721889f | 1666 | { |
6ff7bb0d | 1667 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1668 | struct pm_domain_data *pdd; |
f9ccd7c3 | 1669 | int ret = 0; |
f721889f RW |
1670 | |
1671 | dev_dbg(dev, "%s()\n", __func__); | |
1672 | ||
c0356db7 UH |
1673 | pdd = dev->power.subsys_data->domain_data; |
1674 | gpd_data = to_gpd_data(pdd); | |
0b07ee94 VK |
1675 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
1676 | DEV_PM_QOS_RESUME_LATENCY); | |
c0356db7 | 1677 | |
35241d12 | 1678 | genpd_lock(genpd); |
f721889f | 1679 | |
596ba34b RW |
1680 | if (genpd->prepared_count > 0) { |
1681 | ret = -EAGAIN; | |
1682 | goto out; | |
1683 | } | |
1684 | ||
6ff7bb0d | 1685 | genpd->device_count--; |
f38d1a6d UH |
1686 | if (genpd->gd) |
1687 | genpd->gd->max_off_time_changed = true; | |
6ff7bb0d | 1688 | |
f9ccd7c3 | 1689 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1690 | dev_pm_domain_set(dev, NULL); |
1691 | ||
efa69025 | 1692 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1693 | |
35241d12 | 1694 | genpd_unlock(genpd); |
6ff7bb0d | 1695 | |
2071ac98 JW |
1696 | if (genpd->detach_dev) |
1697 | genpd->detach_dev(genpd, dev); | |
1698 | ||
c1dbe2fb | 1699 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1700 | |
6ff7bb0d | 1701 | return 0; |
f721889f | 1702 | |
596ba34b | 1703 | out: |
35241d12 | 1704 | genpd_unlock(genpd); |
0b07ee94 | 1705 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
f721889f RW |
1706 | |
1707 | return ret; | |
1708 | } | |
85168d56 UH |
1709 | |
1710 | /** | |
1711 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1712 | * @dev: Device to be removed. |
1713 | */ | |
924f4486 | 1714 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1715 | { |
b3ad17c0 | 1716 | struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
924f4486 UH |
1717 | |
1718 | if (!genpd) | |
85168d56 UH |
1719 | return -EINVAL; |
1720 | ||
1721 | return genpd_remove_device(genpd, dev); | |
1722 | } | |
24c96dc7 | 1723 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1724 | |
d4f81383 UH |
1725 | /** |
1726 | * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev | |
1727 | * | |
1728 | * @dev: Device that should be associated with the notifier | |
1729 | * @nb: The notifier block to register | |
1730 | * | |
1731 | * Users may call this function to add a genpd power on/off notifier for an | |
1732 | * attached @dev. Only one notifier per device is allowed. The notifier is | |
1733 | * sent when genpd is powering on/off the PM domain. | |
1734 | * | |
1735 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1736 | * while this routine is getting called. | |
1737 | * | |
1738 | * Returns 0 on success and negative error values on failures. | |
1739 | */ | |
1740 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) | |
1741 | { | |
1742 | struct generic_pm_domain *genpd; | |
1743 | struct generic_pm_domain_data *gpd_data; | |
1744 | int ret; | |
1745 | ||
1746 | genpd = dev_to_genpd_safe(dev); | |
1747 | if (!genpd) | |
1748 | return -ENODEV; | |
1749 | ||
1750 | if (WARN_ON(!dev->power.subsys_data || | |
1751 | !dev->power.subsys_data->domain_data)) | |
1752 | return -EINVAL; | |
1753 | ||
1754 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1755 | if (gpd_data->power_nb) | |
1756 | return -EEXIST; | |
1757 | ||
1758 | genpd_lock(genpd); | |
1759 | ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); | |
1760 | genpd_unlock(genpd); | |
1761 | ||
1762 | if (ret) { | |
1763 | dev_warn(dev, "failed to add notifier for PM domain %s\n", | |
1764 | genpd->name); | |
1765 | return ret; | |
1766 | } | |
1767 | ||
1768 | gpd_data->power_nb = nb; | |
1769 | return 0; | |
1770 | } | |
1771 | EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); | |
1772 | ||
1773 | /** | |
1774 | * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev | |
1775 | * | |
1776 | * @dev: Device that is associated with the notifier | |
1777 | * | |
1778 | * Users may call this function to remove a genpd power on/off notifier for an | |
1779 | * attached @dev. | |
1780 | * | |
1781 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1782 | * while this routine is getting called. | |
1783 | * | |
1784 | * Returns 0 on success and negative error values on failures. | |
1785 | */ | |
1786 | int dev_pm_genpd_remove_notifier(struct device *dev) | |
1787 | { | |
1788 | struct generic_pm_domain *genpd; | |
1789 | struct generic_pm_domain_data *gpd_data; | |
1790 | int ret; | |
1791 | ||
1792 | genpd = dev_to_genpd_safe(dev); | |
1793 | if (!genpd) | |
1794 | return -ENODEV; | |
1795 | ||
1796 | if (WARN_ON(!dev->power.subsys_data || | |
1797 | !dev->power.subsys_data->domain_data)) | |
1798 | return -EINVAL; | |
1799 | ||
1800 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1801 | if (!gpd_data->power_nb) | |
1802 | return -ENODEV; | |
1803 | ||
1804 | genpd_lock(genpd); | |
1805 | ret = raw_notifier_chain_unregister(&genpd->power_notifiers, | |
1806 | gpd_data->power_nb); | |
1807 | genpd_unlock(genpd); | |
1808 | ||
1809 | if (ret) { | |
1810 | dev_warn(dev, "failed to remove notifier for PM domain %s\n", | |
1811 | genpd->name); | |
1812 | return ret; | |
1813 | } | |
1814 | ||
1815 | gpd_data->power_nb = NULL; | |
1816 | return 0; | |
1817 | } | |
1818 | EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); | |
1819 | ||
19efa5ff JH |
1820 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1821 | struct generic_pm_domain *subdomain) | |
f721889f | 1822 | { |
2547923d | 1823 | struct gpd_link *link, *itr; |
f721889f RW |
1824 | int ret = 0; |
1825 | ||
fb7268be RW |
1826 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1827 | || genpd == subdomain) | |
f721889f RW |
1828 | return -EINVAL; |
1829 | ||
d716f479 LI |
1830 | /* |
1831 | * If the domain can be powered on/off in an IRQ safe | |
1832 | * context, ensure that the subdomain can also be | |
1833 | * powered on/off in that context. | |
1834 | */ | |
1835 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1836 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1837 | genpd->name, subdomain->name); |
1838 | return -EINVAL; | |
1839 | } | |
1840 | ||
2547923d LI |
1841 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1842 | if (!link) | |
1843 | return -ENOMEM; | |
1844 | ||
35241d12 LI |
1845 | genpd_lock(subdomain); |
1846 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1847 | |
41e2c8e0 | 1848 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1849 | ret = -EINVAL; |
1850 | goto out; | |
1851 | } | |
1852 | ||
8d87ae48 KC |
1853 | list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
1854 | if (itr->child == subdomain && itr->parent == genpd) { | |
f721889f RW |
1855 | ret = -EINVAL; |
1856 | goto out; | |
1857 | } | |
1858 | } | |
1859 | ||
8d87ae48 KC |
1860 | link->parent = genpd; |
1861 | list_add_tail(&link->parent_node, &genpd->parent_links); | |
1862 | link->child = subdomain; | |
1863 | list_add_tail(&link->child_node, &subdomain->child_links); | |
41e2c8e0 | 1864 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1865 | genpd_sd_counter_inc(genpd); |
f721889f | 1866 | |
f721889f | 1867 | out: |
35241d12 LI |
1868 | genpd_unlock(genpd); |
1869 | genpd_unlock(subdomain); | |
2547923d LI |
1870 | if (ret) |
1871 | kfree(link); | |
f721889f RW |
1872 | return ret; |
1873 | } | |
19efa5ff JH |
1874 | |
1875 | /** | |
1876 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
8d87ae48 | 1877 | * @genpd: Leader PM domain to add the subdomain to. |
19efa5ff JH |
1878 | * @subdomain: Subdomain to be added. |
1879 | */ | |
1880 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1881 | struct generic_pm_domain *subdomain) | |
1882 | { | |
1883 | int ret; | |
1884 | ||
1885 | mutex_lock(&gpd_list_lock); | |
1886 | ret = genpd_add_subdomain(genpd, subdomain); | |
1887 | mutex_unlock(&gpd_list_lock); | |
1888 | ||
1889 | return ret; | |
1890 | } | |
d60ee966 | 1891 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1892 | |
1893 | /** | |
1894 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
8d87ae48 | 1895 | * @genpd: Leader PM domain to remove the subdomain from. |
5063ce15 | 1896 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1897 | */ |
1898 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1899 | struct generic_pm_domain *subdomain) |
f721889f | 1900 | { |
c6e83cac | 1901 | struct gpd_link *l, *link; |
f721889f RW |
1902 | int ret = -EINVAL; |
1903 | ||
5063ce15 | 1904 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1905 | return -EINVAL; |
1906 | ||
35241d12 LI |
1907 | genpd_lock(subdomain); |
1908 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1909 | |
8d87ae48 | 1910 | if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
7a5bd127 JP |
1911 | pr_warn("%s: unable to remove subdomain %s\n", |
1912 | genpd->name, subdomain->name); | |
30e7a65b JH |
1913 | ret = -EBUSY; |
1914 | goto out; | |
1915 | } | |
1916 | ||
8d87ae48 KC |
1917 | list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
1918 | if (link->child != subdomain) | |
f721889f RW |
1919 | continue; |
1920 | ||
8d87ae48 KC |
1921 | list_del(&link->parent_node); |
1922 | list_del(&link->child_node); | |
5063ce15 | 1923 | kfree(link); |
41e2c8e0 | 1924 | if (genpd_status_on(subdomain)) |
f721889f RW |
1925 | genpd_sd_counter_dec(genpd); |
1926 | ||
f721889f RW |
1927 | ret = 0; |
1928 | break; | |
1929 | } | |
1930 | ||
30e7a65b | 1931 | out: |
35241d12 LI |
1932 | genpd_unlock(genpd); |
1933 | genpd_unlock(subdomain); | |
f721889f RW |
1934 | |
1935 | return ret; | |
1936 | } | |
d60ee966 | 1937 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1938 | |
49a27e27 UH |
1939 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1940 | unsigned int state_count) | |
1941 | { | |
1942 | kfree(states); | |
1943 | } | |
1944 | ||
59d65b73 LI |
1945 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1946 | { | |
1947 | struct genpd_power_state *state; | |
1948 | ||
1949 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1950 | if (!state) | |
1951 | return -ENOMEM; | |
1952 | ||
1953 | genpd->states = state; | |
1954 | genpd->state_count = 1; | |
49a27e27 | 1955 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1956 | |
1957 | return 0; | |
1958 | } | |
1959 | ||
ba43d6db UH |
1960 | static int genpd_alloc_data(struct generic_pm_domain *genpd) |
1961 | { | |
f38d1a6d | 1962 | struct genpd_governor_data *gd = NULL; |
ba43d6db UH |
1963 | int ret; |
1964 | ||
1965 | if (genpd_is_cpu_domain(genpd) && | |
1966 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
1967 | return -ENOMEM; | |
1968 | ||
f38d1a6d UH |
1969 | if (genpd->gov) { |
1970 | gd = kzalloc(sizeof(*gd), GFP_KERNEL); | |
1971 | if (!gd) { | |
1972 | ret = -ENOMEM; | |
1973 | goto free; | |
1974 | } | |
1975 | ||
1976 | gd->max_off_time_ns = -1; | |
1977 | gd->max_off_time_changed = true; | |
1978 | gd->next_wakeup = KTIME_MAX; | |
1498c503 | 1979 | gd->next_hrtimer = KTIME_MAX; |
f38d1a6d UH |
1980 | } |
1981 | ||
ba43d6db UH |
1982 | /* Use only one "off" state if there were no states declared */ |
1983 | if (genpd->state_count == 0) { | |
1984 | ret = genpd_set_default_power_state(genpd); | |
1985 | if (ret) | |
1986 | goto free; | |
1987 | } | |
1988 | ||
f38d1a6d | 1989 | genpd->gd = gd; |
ba43d6db UH |
1990 | return 0; |
1991 | ||
1992 | free: | |
1993 | if (genpd_is_cpu_domain(genpd)) | |
1994 | free_cpumask_var(genpd->cpus); | |
f38d1a6d | 1995 | kfree(gd); |
ba43d6db UH |
1996 | return ret; |
1997 | } | |
1998 | ||
1999 | static void genpd_free_data(struct generic_pm_domain *genpd) | |
2000 | { | |
2001 | if (genpd_is_cpu_domain(genpd)) | |
2002 | free_cpumask_var(genpd->cpus); | |
2003 | if (genpd->free_states) | |
2004 | genpd->free_states(genpd->states, genpd->state_count); | |
f38d1a6d | 2005 | kfree(genpd->gd); |
ba43d6db UH |
2006 | } |
2007 | ||
d716f479 LI |
2008 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
2009 | { | |
2010 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
2011 | spin_lock_init(&genpd->slock); | |
2012 | genpd->lock_ops = &genpd_spin_ops; | |
2013 | } else { | |
2014 | mutex_init(&genpd->mlock); | |
2015 | genpd->lock_ops = &genpd_mtx_ops; | |
2016 | } | |
2017 | } | |
2018 | ||
f721889f RW |
2019 | /** |
2020 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
2021 | * @genpd: PM domain object to initialize. | |
2022 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
2023 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
2024 | * |
2025 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 2026 | */ |
7eb231c3 UH |
2027 | int pm_genpd_init(struct generic_pm_domain *genpd, |
2028 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 2029 | { |
59d65b73 LI |
2030 | int ret; |
2031 | ||
f721889f | 2032 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 2033 | return -EINVAL; |
f721889f | 2034 | |
8d87ae48 KC |
2035 | INIT_LIST_HEAD(&genpd->parent_links); |
2036 | INIT_LIST_HEAD(&genpd->child_links); | |
f721889f | 2037 | INIT_LIST_HEAD(&genpd->dev_list); |
d4f81383 | 2038 | RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
d716f479 | 2039 | genpd_lock_init(genpd); |
f721889f RW |
2040 | genpd->gov = gov; |
2041 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 2042 | atomic_set(&genpd->sd_count, 0); |
49f618e1 | 2043 | genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
596ba34b | 2044 | genpd->device_count = 0; |
de0aa06d JH |
2045 | genpd->provider = NULL; |
2046 | genpd->has_provider = false; | |
bd40cbb0 | 2047 | genpd->accounting_time = ktime_get_mono_fast_ns(); |
795bd2e7 UH |
2048 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
2049 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
2050 | genpd->domain.ops.prepare = genpd_prepare; |
2051 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
2052 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
2053 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
2054 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
2055 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
2056 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
2057 | genpd->domain.ops.complete = genpd_complete; | |
ea71c596 | 2058 | genpd->domain.start = genpd_dev_pm_start; |
c11f6f5b UH |
2059 | |
2060 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
2061 | genpd->dev_ops.stop = pm_clk_suspend; | |
2062 | genpd->dev_ops.start = pm_clk_resume; | |
2063 | } | |
2064 | ||
27656dcd UH |
2065 | /* The always-on governor works better with the corresponding flag. */ |
2066 | if (gov == &pm_domain_always_on_gov) | |
2067 | genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; | |
2068 | ||
ffaa42e8 | 2069 | /* Always-on domains must be powered on at initialization. */ |
ed61e18a | 2070 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
129b60c9 JH |
2071 | !genpd_status_on(genpd)) { |
2072 | pr_err("always-on PM domain %s is not on\n", genpd->name); | |
ffaa42e8 | 2073 | return -EINVAL; |
129b60c9 | 2074 | } |
ffaa42e8 | 2075 | |
ba43d6db UH |
2076 | /* Multiple states but no governor doesn't make sense. */ |
2077 | if (!gov && genpd->state_count > 1) | |
7a5bd127 | 2078 | pr_warn("%s: no governor for states\n", genpd->name); |
ba43d6db UH |
2079 | |
2080 | ret = genpd_alloc_data(genpd); | |
2081 | if (ret) | |
2082 | return ret; | |
fc5cbf0c | 2083 | |
401ea157 VK |
2084 | device_initialize(&genpd->dev); |
2085 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
2086 | ||
5125bbf3 RW |
2087 | mutex_lock(&gpd_list_lock); |
2088 | list_add(&genpd->gpd_list_node, &gpd_list); | |
2089 | mutex_unlock(&gpd_list_lock); | |
40ba55e4 | 2090 | genpd_debug_add(genpd); |
7eb231c3 UH |
2091 | |
2092 | return 0; | |
5125bbf3 | 2093 | } |
be5ed55d | 2094 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 2095 | |
3fe57710 JH |
2096 | static int genpd_remove(struct generic_pm_domain *genpd) |
2097 | { | |
2098 | struct gpd_link *l, *link; | |
2099 | ||
2100 | if (IS_ERR_OR_NULL(genpd)) | |
2101 | return -EINVAL; | |
2102 | ||
35241d12 | 2103 | genpd_lock(genpd); |
3fe57710 JH |
2104 | |
2105 | if (genpd->has_provider) { | |
35241d12 | 2106 | genpd_unlock(genpd); |
3fe57710 JH |
2107 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
2108 | return -EBUSY; | |
2109 | } | |
2110 | ||
8d87ae48 | 2111 | if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
35241d12 | 2112 | genpd_unlock(genpd); |
3fe57710 JH |
2113 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
2114 | return -EBUSY; | |
2115 | } | |
2116 | ||
8d87ae48 KC |
2117 | list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
2118 | list_del(&link->parent_node); | |
2119 | list_del(&link->child_node); | |
3fe57710 JH |
2120 | kfree(link); |
2121 | } | |
2122 | ||
2123 | list_del(&genpd->gpd_list_node); | |
35241d12 | 2124 | genpd_unlock(genpd); |
f6bfe8b5 | 2125 | genpd_debug_remove(genpd); |
3fe57710 | 2126 | cancel_work_sync(&genpd->power_off_work); |
ba43d6db | 2127 | genpd_free_data(genpd); |
49a27e27 | 2128 | |
3fe57710 JH |
2129 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
2130 | ||
2131 | return 0; | |
2132 | } | |
2133 | ||
2134 | /** | |
2135 | * pm_genpd_remove - Remove a generic I/O PM domain | |
2136 | * @genpd: Pointer to PM domain that is to be removed. | |
2137 | * | |
2138 | * To remove the PM domain, this function: | |
2139 | * - Removes the PM domain as a subdomain to any parent domains, | |
2140 | * if it was added. | |
2141 | * - Removes the PM domain from the list of registered PM domains. | |
2142 | * | |
2143 | * The PM domain will only be removed, if the associated provider has | |
2144 | * been removed, it is not a parent to any other PM domain and has no | |
2145 | * devices associated with it. | |
2146 | */ | |
2147 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
2148 | { | |
2149 | int ret; | |
2150 | ||
2151 | mutex_lock(&gpd_list_lock); | |
2152 | ret = genpd_remove(genpd); | |
2153 | mutex_unlock(&gpd_list_lock); | |
2154 | ||
2155 | return ret; | |
2156 | } | |
2157 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
2158 | ||
aa42240a | 2159 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 2160 | |
aa42240a TF |
2161 | /* |
2162 | * Device Tree based PM domain providers. | |
2163 | * | |
2164 | * The code below implements generic device tree based PM domain providers that | |
2165 | * bind device tree nodes with generic PM domains registered in the system. | |
2166 | * | |
2167 | * Any driver that registers generic PM domains and needs to support binding of | |
2168 | * devices to these domains is supposed to register a PM domain provider, which | |
2169 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
2170 | * | |
2171 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
2172 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
2173 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
2174 | * index. |
2175 | */ | |
2176 | ||
2177 | /** | |
2178 | * struct of_genpd_provider - PM domain provider registration structure | |
2179 | * @link: Entry in global list of PM domain providers | |
2180 | * @node: Pointer to device tree node of PM domain provider | |
2181 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
2182 | * into a PM domain. | |
2183 | * @data: context pointer to be passed into @xlate callback | |
2184 | */ | |
2185 | struct of_genpd_provider { | |
2186 | struct list_head link; | |
2187 | struct device_node *node; | |
2188 | genpd_xlate_t xlate; | |
2189 | void *data; | |
2190 | }; | |
2191 | ||
2192 | /* List of registered PM domain providers. */ | |
2193 | static LIST_HEAD(of_genpd_providers); | |
2194 | /* Mutex to protect the list above. */ | |
2195 | static DEFINE_MUTEX(of_genpd_mutex); | |
2196 | ||
2197 | /** | |
892ebdcc | 2198 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
2199 | * @genpdspec: OF phandle args to map into a PM domain |
2200 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
2201 | * | |
2202 | * This is a generic xlate function that can be used to model PM domains that | |
2203 | * have their own device tree nodes. The private data of xlate function needs | |
2204 | * to be a valid pointer to struct generic_pm_domain. | |
2205 | */ | |
892ebdcc | 2206 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
2207 | struct of_phandle_args *genpdspec, |
2208 | void *data) | |
2209 | { | |
aa42240a TF |
2210 | return data; |
2211 | } | |
aa42240a TF |
2212 | |
2213 | /** | |
892ebdcc | 2214 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
2215 | * @genpdspec: OF phandle args to map into a PM domain |
2216 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2217 | * | |
2218 | * This is a generic xlate function that can be used to model simple PM domain | |
2219 | * controllers that have one device tree node and provide multiple PM domains. | |
2220 | * A single cell is used as an index into an array of PM domains specified in | |
2221 | * the genpd_onecell_data struct when registering the provider. | |
2222 | */ | |
892ebdcc | 2223 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
2224 | struct of_phandle_args *genpdspec, |
2225 | void *data) | |
2226 | { | |
2227 | struct genpd_onecell_data *genpd_data = data; | |
2228 | unsigned int idx = genpdspec->args[0]; | |
2229 | ||
2230 | if (genpdspec->args_count != 1) | |
2231 | return ERR_PTR(-EINVAL); | |
2232 | ||
2233 | if (idx >= genpd_data->num_domains) { | |
2234 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2235 | return ERR_PTR(-EINVAL); | |
2236 | } | |
2237 | ||
2238 | if (!genpd_data->domains[idx]) | |
2239 | return ERR_PTR(-ENOENT); | |
2240 | ||
2241 | return genpd_data->domains[idx]; | |
2242 | } | |
aa42240a TF |
2243 | |
2244 | /** | |
892ebdcc | 2245 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
2246 | * @np: Device node pointer associated with the PM domain provider. |
2247 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2248 | * @data: Context pointer for @xlate callback. | |
2249 | */ | |
892ebdcc JH |
2250 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2251 | void *data) | |
aa42240a TF |
2252 | { |
2253 | struct of_genpd_provider *cp; | |
2254 | ||
2255 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2256 | if (!cp) | |
2257 | return -ENOMEM; | |
2258 | ||
2259 | cp->node = of_node_get(np); | |
2260 | cp->data = data; | |
2261 | cp->xlate = xlate; | |
bab2d712 | 2262 | fwnode_dev_initialized(&np->fwnode, true); |
aa42240a TF |
2263 | |
2264 | mutex_lock(&of_genpd_mutex); | |
2265 | list_add(&cp->link, &of_genpd_providers); | |
2266 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2267 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2268 | |
2269 | return 0; | |
2270 | } | |
892ebdcc | 2271 | |
fe0c2baa UH |
2272 | static bool genpd_present(const struct generic_pm_domain *genpd) |
2273 | { | |
40ba55e4 | 2274 | bool ret = false; |
fe0c2baa UH |
2275 | const struct generic_pm_domain *gpd; |
2276 | ||
40ba55e4 SB |
2277 | mutex_lock(&gpd_list_lock); |
2278 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2279 | if (gpd == genpd) { | |
2280 | ret = true; | |
2281 | break; | |
2282 | } | |
2283 | } | |
2284 | mutex_unlock(&gpd_list_lock); | |
2285 | ||
2286 | return ret; | |
fe0c2baa UH |
2287 | } |
2288 | ||
892ebdcc JH |
2289 | /** |
2290 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2291 | * @np: Device node pointer associated with the PM domain provider. | |
2292 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2293 | */ | |
2294 | int of_genpd_add_provider_simple(struct device_node *np, | |
2295 | struct generic_pm_domain *genpd) | |
2296 | { | |
40ba55e4 | 2297 | int ret; |
0159ec67 JH |
2298 | |
2299 | if (!np || !genpd) | |
2300 | return -EINVAL; | |
2301 | ||
6a0ae73d | 2302 | if (!genpd_present(genpd)) |
40ba55e4 | 2303 | return -EINVAL; |
6a0ae73d VK |
2304 | |
2305 | genpd->dev.of_node = np; | |
2306 | ||
2307 | /* Parse genpd OPP table */ | |
2308 | if (genpd->set_performance_state) { | |
2309 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
9a6582b8 AF |
2310 | if (ret) |
2311 | return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n"); | |
1067ae3e VK |
2312 | |
2313 | /* | |
2314 | * Save table for faster processing while setting performance | |
2315 | * state. | |
2316 | */ | |
2317 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
dd461cd9 | 2318 | WARN_ON(IS_ERR(genpd->opp_table)); |
de0aa06d JH |
2319 | } |
2320 | ||
6a0ae73d VK |
2321 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2322 | if (ret) { | |
1067ae3e VK |
2323 | if (genpd->set_performance_state) { |
2324 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2325 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2326 | } |
6a0ae73d | 2327 | |
40ba55e4 | 2328 | return ret; |
6a0ae73d VK |
2329 | } |
2330 | ||
2331 | genpd->provider = &np->fwnode; | |
2332 | genpd->has_provider = true; | |
2333 | ||
40ba55e4 | 2334 | return 0; |
892ebdcc JH |
2335 | } |
2336 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2337 | ||
2338 | /** | |
2339 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2340 | * @np: Device node pointer associated with the PM domain provider. | |
2341 | * @data: Pointer to the data associated with the PM domain provider. | |
2342 | */ | |
2343 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2344 | struct genpd_onecell_data *data) | |
2345 | { | |
6a0ae73d | 2346 | struct generic_pm_domain *genpd; |
0159ec67 | 2347 | unsigned int i; |
de0aa06d | 2348 | int ret = -EINVAL; |
0159ec67 JH |
2349 | |
2350 | if (!np || !data) | |
2351 | return -EINVAL; | |
2352 | ||
40845524 TR |
2353 | if (!data->xlate) |
2354 | data->xlate = genpd_xlate_onecell; | |
2355 | ||
0159ec67 | 2356 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2357 | genpd = data->domains[i]; |
2358 | ||
2359 | if (!genpd) | |
609bed67 | 2360 | continue; |
6a0ae73d | 2361 | if (!genpd_present(genpd)) |
de0aa06d JH |
2362 | goto error; |
2363 | ||
6a0ae73d VK |
2364 | genpd->dev.of_node = np; |
2365 | ||
2366 | /* Parse genpd OPP table */ | |
2367 | if (genpd->set_performance_state) { | |
2368 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2369 | if (ret) { | |
9a6582b8 AF |
2370 | dev_err_probe(&genpd->dev, ret, |
2371 | "Failed to add OPP table for index %d\n", i); | |
6a0ae73d VK |
2372 | goto error; |
2373 | } | |
1067ae3e VK |
2374 | |
2375 | /* | |
2376 | * Save table for faster processing while setting | |
2377 | * performance state. | |
2378 | */ | |
e77dcb0b | 2379 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
dd461cd9 | 2380 | WARN_ON(IS_ERR(genpd->opp_table)); |
6a0ae73d VK |
2381 | } |
2382 | ||
2383 | genpd->provider = &np->fwnode; | |
2384 | genpd->has_provider = true; | |
0159ec67 JH |
2385 | } |
2386 | ||
40845524 | 2387 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2388 | if (ret < 0) |
2389 | goto error; | |
2390 | ||
de0aa06d JH |
2391 | return 0; |
2392 | ||
2393 | error: | |
2394 | while (i--) { | |
6a0ae73d VK |
2395 | genpd = data->domains[i]; |
2396 | ||
2397 | if (!genpd) | |
609bed67 | 2398 | continue; |
6a0ae73d VK |
2399 | |
2400 | genpd->provider = NULL; | |
2401 | genpd->has_provider = false; | |
2402 | ||
1067ae3e VK |
2403 | if (genpd->set_performance_state) { |
2404 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2405 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2406 | } |
de0aa06d | 2407 | } |
0159ec67 | 2408 | |
0159ec67 | 2409 | return ret; |
892ebdcc JH |
2410 | } |
2411 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2412 | |
2413 | /** | |
2414 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2415 | * @np: Device node pointer associated with the PM domain provider | |
2416 | */ | |
2417 | void of_genpd_del_provider(struct device_node *np) | |
2418 | { | |
b556b15d | 2419 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2420 | struct generic_pm_domain *gpd; |
aa42240a | 2421 | |
de0aa06d | 2422 | mutex_lock(&gpd_list_lock); |
aa42240a | 2423 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2424 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2425 | if (cp->node == np) { |
de0aa06d JH |
2426 | /* |
2427 | * For each PM domain associated with the | |
2428 | * provider, set the 'has_provider' to false | |
2429 | * so that the PM domain can be safely removed. | |
2430 | */ | |
6a0ae73d VK |
2431 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2432 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2433 | gpd->has_provider = false; |
2434 | ||
6a0ae73d VK |
2435 | if (!gpd->set_performance_state) |
2436 | continue; | |
2437 | ||
1067ae3e | 2438 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2439 | dev_pm_opp_of_remove_table(&gpd->dev); |
2440 | } | |
2441 | } | |
2442 | ||
bab2d712 | 2443 | fwnode_dev_initialized(&cp->node->fwnode, false); |
aa42240a TF |
2444 | list_del(&cp->link); |
2445 | of_node_put(cp->node); | |
2446 | kfree(cp); | |
2447 | break; | |
2448 | } | |
2449 | } | |
2450 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2451 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2452 | } |
2453 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2454 | ||
2455 | /** | |
f58d4e5a | 2456 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2457 | * @genpdspec: OF phandle args to use for look-up |
2458 | * | |
2459 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2460 | * found, uses xlate function of the provider to map phandle args to a PM | |
2461 | * domain. | |
2462 | * | |
2463 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2464 | * on failure. | |
2465 | */ | |
f58d4e5a | 2466 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2467 | struct of_phandle_args *genpdspec) |
2468 | { | |
2469 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2470 | struct of_genpd_provider *provider; | |
2471 | ||
41795a8a JH |
2472 | if (!genpdspec) |
2473 | return ERR_PTR(-EINVAL); | |
2474 | ||
aa42240a TF |
2475 | mutex_lock(&of_genpd_mutex); |
2476 | ||
2477 | /* Check if we have such a provider in our array */ | |
2478 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2479 | if (provider->node == genpdspec->np) | |
2480 | genpd = provider->xlate(genpdspec, provider->data); | |
2481 | if (!IS_ERR(genpd)) | |
2482 | break; | |
2483 | } | |
2484 | ||
2485 | mutex_unlock(&of_genpd_mutex); | |
2486 | ||
2487 | return genpd; | |
2488 | } | |
2489 | ||
ec69572b JH |
2490 | /** |
2491 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2492 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2493 | * @dev: Device to be added. | |
2494 | * | |
2495 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2496 | * the device to the PM domain. Returns a negative error code on failure. | |
2497 | */ | |
2498 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2499 | { | |
2500 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2501 | int ret; |
2502 | ||
2503 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2504 | |
f58d4e5a | 2505 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2506 | if (IS_ERR(genpd)) { |
2507 | ret = PTR_ERR(genpd); | |
2508 | goto out; | |
2509 | } | |
2510 | ||
f9ccd7c3 | 2511 | ret = genpd_add_device(genpd, dev, dev); |
ec69572b | 2512 | |
19efa5ff JH |
2513 | out: |
2514 | mutex_unlock(&gpd_list_lock); | |
2515 | ||
2516 | return ret; | |
ec69572b JH |
2517 | } |
2518 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2519 | ||
2520 | /** | |
2521 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2522 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2523 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2524 | * | |
2525 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2526 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2527 | * negative error code on failure. | |
2528 | */ | |
2529 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2530 | struct of_phandle_args *subdomain_spec) | |
2531 | { | |
2532 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2533 | int ret; |
2534 | ||
2535 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2536 | |
f58d4e5a | 2537 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2538 | if (IS_ERR(parent)) { |
2539 | ret = PTR_ERR(parent); | |
2540 | goto out; | |
2541 | } | |
ec69572b | 2542 | |
f58d4e5a | 2543 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2544 | if (IS_ERR(subdomain)) { |
2545 | ret = PTR_ERR(subdomain); | |
2546 | goto out; | |
2547 | } | |
2548 | ||
2549 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2550 | |
19efa5ff JH |
2551 | out: |
2552 | mutex_unlock(&gpd_list_lock); | |
2553 | ||
18027d6f | 2554 | return ret == -ENOENT ? -EPROBE_DEFER : ret; |
ec69572b JH |
2555 | } |
2556 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2557 | ||
dedd1492 UH |
2558 | /** |
2559 | * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
2560 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2561 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2562 | * | |
2563 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2564 | * provided and removes the subdomain from the parent PM domain. Returns a | |
2565 | * negative error code on failure. | |
2566 | */ | |
2567 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, | |
2568 | struct of_phandle_args *subdomain_spec) | |
2569 | { | |
2570 | struct generic_pm_domain *parent, *subdomain; | |
2571 | int ret; | |
2572 | ||
2573 | mutex_lock(&gpd_list_lock); | |
2574 | ||
2575 | parent = genpd_get_from_provider(parent_spec); | |
2576 | if (IS_ERR(parent)) { | |
2577 | ret = PTR_ERR(parent); | |
2578 | goto out; | |
2579 | } | |
2580 | ||
2581 | subdomain = genpd_get_from_provider(subdomain_spec); | |
2582 | if (IS_ERR(subdomain)) { | |
2583 | ret = PTR_ERR(subdomain); | |
2584 | goto out; | |
2585 | } | |
2586 | ||
2587 | ret = pm_genpd_remove_subdomain(parent, subdomain); | |
2588 | ||
2589 | out: | |
2590 | mutex_unlock(&gpd_list_lock); | |
2591 | ||
2592 | return ret; | |
2593 | } | |
2594 | EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); | |
2595 | ||
17926551 JH |
2596 | /** |
2597 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
763663c9 | 2598 | * @np: Pointer to device node associated with provider |
17926551 JH |
2599 | * |
2600 | * Find the last PM domain that was added by a particular provider and | |
2601 | * remove this PM domain from the list of PM domains. The provider is | |
2602 | * identified by the 'provider' device structure that is passed. The PM | |
2603 | * domain will only be removed, if the provider associated with domain | |
2604 | * has been removed. | |
2605 | * | |
2606 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2607 | * ERR_PTR() on failure. | |
2608 | */ | |
2609 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2610 | { | |
a7e2d1bc | 2611 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2612 | int ret; |
2613 | ||
2614 | if (IS_ERR_OR_NULL(np)) | |
2615 | return ERR_PTR(-EINVAL); | |
2616 | ||
2617 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2618 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2619 | if (gpd->provider == &np->fwnode) { |
2620 | ret = genpd_remove(gpd); | |
2621 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2622 | break; | |
2623 | } | |
2624 | } | |
2625 | mutex_unlock(&gpd_list_lock); | |
2626 | ||
2627 | return genpd; | |
2628 | } | |
2629 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2630 | ||
3c095f32 UH |
2631 | static void genpd_release_dev(struct device *dev) |
2632 | { | |
e8b04de9 | 2633 | of_node_put(dev->of_node); |
3c095f32 UH |
2634 | kfree(dev); |
2635 | } | |
2636 | ||
2637 | static struct bus_type genpd_bus_type = { | |
2638 | .name = "genpd", | |
2639 | }; | |
2640 | ||
aa42240a TF |
2641 | /** |
2642 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2643 | * @dev: Device to detach. |
aa42240a TF |
2644 | * @power_off: Currently not used |
2645 | * | |
2646 | * Try to locate a corresponding generic PM domain, which the device was | |
2647 | * attached to previously. If such is found, the device is detached from it. | |
2648 | */ | |
2649 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2650 | { | |
446d999c | 2651 | struct generic_pm_domain *pd; |
93af5e93 | 2652 | unsigned int i; |
aa42240a TF |
2653 | int ret = 0; |
2654 | ||
85168d56 UH |
2655 | pd = dev_to_genpd(dev); |
2656 | if (IS_ERR(pd)) | |
aa42240a TF |
2657 | return; |
2658 | ||
2659 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2660 | ||
c016baf7 RN |
2661 | /* Drop the default performance state */ |
2662 | if (dev_gpd_data(dev)->default_pstate) { | |
2663 | dev_pm_genpd_set_performance_state(dev, 0); | |
2664 | dev_gpd_data(dev)->default_pstate = 0; | |
2665 | } | |
2666 | ||
93af5e93 | 2667 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2668 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2669 | if (ret != -EAGAIN) |
2670 | break; | |
93af5e93 GU |
2671 | |
2672 | mdelay(i); | |
aa42240a TF |
2673 | cond_resched(); |
2674 | } | |
2675 | ||
2676 | if (ret < 0) { | |
2677 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2678 | pd->name, ret); | |
2679 | return; | |
2680 | } | |
2681 | ||
2682 | /* Check if PM domain can be powered off after removing this device. */ | |
2683 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2684 | |
2685 | /* Unregister the device if it was created by genpd. */ | |
2686 | if (dev->bus == &genpd_bus_type) | |
2687 | device_unregister(dev); | |
aa42240a TF |
2688 | } |
2689 | ||
632f7ce3 RK |
2690 | static void genpd_dev_pm_sync(struct device *dev) |
2691 | { | |
2692 | struct generic_pm_domain *pd; | |
2693 | ||
2694 | pd = dev_to_genpd(dev); | |
2695 | if (IS_ERR(pd)) | |
2696 | return; | |
2697 | ||
2698 | genpd_queue_power_off_work(pd); | |
2699 | } | |
2700 | ||
51dcf748 UH |
2701 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2702 | unsigned int index, bool power_on) | |
aa42240a TF |
2703 | { |
2704 | struct of_phandle_args pd_args; | |
2705 | struct generic_pm_domain *pd; | |
c016baf7 | 2706 | int pstate; |
aa42240a TF |
2707 | int ret; |
2708 | ||
e8b04de9 | 2709 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2710 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2711 | if (ret < 0) |
bcd931f2 | 2712 | return ret; |
aa42240a | 2713 | |
19efa5ff | 2714 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2715 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2716 | of_node_put(pd_args.np); |
aa42240a | 2717 | if (IS_ERR(pd)) { |
19efa5ff | 2718 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2719 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2720 | __func__, PTR_ERR(pd)); | |
e20813dc | 2721 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2722 | } |
2723 | ||
2724 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2725 | ||
f9ccd7c3 | 2726 | ret = genpd_add_device(pd, dev, base_dev); |
19efa5ff | 2727 | mutex_unlock(&gpd_list_lock); |
aa42240a | 2728 | |
9a6582b8 AF |
2729 | if (ret < 0) |
2730 | return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name); | |
aa42240a TF |
2731 | |
2732 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2733 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2734 | |
c016baf7 RN |
2735 | /* Set the default performance state */ |
2736 | pstate = of_get_required_opp_performance_state(dev->of_node, index); | |
65616418 | 2737 | if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) { |
c016baf7 RN |
2738 | ret = pstate; |
2739 | goto err; | |
2740 | } else if (pstate > 0) { | |
2741 | ret = dev_pm_genpd_set_performance_state(dev, pstate); | |
2742 | if (ret) | |
2743 | goto err; | |
2744 | dev_gpd_data(dev)->default_pstate = pstate; | |
2745 | } | |
ae8ac196 AV |
2746 | |
2747 | if (power_on) { | |
2748 | genpd_lock(pd); | |
2749 | ret = genpd_power_on(pd, 0); | |
2750 | genpd_unlock(pd); | |
2751 | } | |
2752 | ||
2753 | if (ret) { | |
2754 | /* Drop the default performance state */ | |
2755 | if (dev_gpd_data(dev)->default_pstate) { | |
2756 | dev_pm_genpd_set_performance_state(dev, 0); | |
2757 | dev_gpd_data(dev)->default_pstate = 0; | |
2758 | } | |
2759 | ||
2760 | genpd_remove_device(pd, dev); | |
2761 | return -EPROBE_DEFER; | |
2762 | } | |
2763 | ||
c016baf7 RN |
2764 | return 1; |
2765 | ||
2766 | err: | |
2767 | dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", | |
2768 | pd->name, ret); | |
2769 | genpd_remove_device(pd, dev); | |
2770 | return ret; | |
aa42240a | 2771 | } |
8cb1cbd6 UH |
2772 | |
2773 | /** | |
2774 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2775 | * @dev: Device to attach. | |
2776 | * | |
2777 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2778 | * attaches the device to retrieved pm_domain ops. | |
2779 | * | |
2780 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2781 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2782 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2783 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2784 | * not probed and to re-try again later. | |
2785 | */ | |
2786 | int genpd_dev_pm_attach(struct device *dev) | |
2787 | { | |
2788 | if (!dev->of_node) | |
2789 | return 0; | |
2790 | ||
2791 | /* | |
2792 | * Devices with multiple PM domains must be attached separately, as we | |
2793 | * can only attach one PM domain per device. | |
2794 | */ | |
2795 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2796 | "#power-domain-cells") != 1) | |
2797 | return 0; | |
2798 | ||
51dcf748 | 2799 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2800 | } |
aa42240a | 2801 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2802 | |
3c095f32 UH |
2803 | /** |
2804 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2805 | * @dev: The device used to lookup the PM domain. | |
2806 | * @index: The index of the PM domain. | |
2807 | * | |
2808 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2809 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2810 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2811 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2812 | * | |
2813 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2814 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2815 | * failures. If a power-domain exists for the device, but cannot be found or | |
2816 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2817 | * is not probed and to re-try again later. | |
2818 | */ | |
2819 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2820 | unsigned int index) | |
2821 | { | |
560928b2 | 2822 | struct device *virt_dev; |
3c095f32 UH |
2823 | int num_domains; |
2824 | int ret; | |
2825 | ||
2826 | if (!dev->of_node) | |
2827 | return NULL; | |
2828 | ||
3ccf3f0c | 2829 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2830 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2831 | "#power-domain-cells"); | |
3ccf3f0c | 2832 | if (index >= num_domains) |
3c095f32 UH |
2833 | return NULL; |
2834 | ||
2835 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2836 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2837 | if (!virt_dev) | |
3c095f32 UH |
2838 | return ERR_PTR(-ENOMEM); |
2839 | ||
560928b2 VK |
2840 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2841 | virt_dev->bus = &genpd_bus_type; | |
2842 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2843 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2844 | |
560928b2 | 2845 | ret = device_register(virt_dev); |
3c095f32 | 2846 | if (ret) { |
71b77697 | 2847 | put_device(virt_dev); |
3c095f32 UH |
2848 | return ERR_PTR(ret); |
2849 | } | |
2850 | ||
2851 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2852 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2853 | if (ret < 1) { |
560928b2 | 2854 | device_unregister(virt_dev); |
3c095f32 UH |
2855 | return ret ? ERR_PTR(ret) : NULL; |
2856 | } | |
2857 | ||
560928b2 VK |
2858 | pm_runtime_enable(virt_dev); |
2859 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2860 | |
560928b2 | 2861 | return virt_dev; |
3c095f32 UH |
2862 | } |
2863 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2864 | ||
5d6be70a UH |
2865 | /** |
2866 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2867 | * @dev: The device used to lookup the PM domain. | |
2868 | * @name: The name of the PM domain. | |
2869 | * | |
2870 | * Parse device's OF node to find a PM domain specifier using the | |
2871 | * power-domain-names DT property. For further description see | |
2872 | * genpd_dev_pm_attach_by_id(). | |
2873 | */ | |
7416f1f2 | 2874 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2875 | { |
2876 | int index; | |
2877 | ||
2878 | if (!dev->of_node) | |
2879 | return NULL; | |
2880 | ||
2881 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2882 | name); | |
2883 | if (index < 0) | |
2884 | return NULL; | |
2885 | ||
2886 | return genpd_dev_pm_attach_by_id(dev, index); | |
2887 | } | |
2888 | ||
30f60428 | 2889 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2890 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2891 | { } |
2892 | }; | |
2893 | ||
2894 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2895 | struct device_node *state_node) | |
2896 | { | |
2897 | int err; | |
2898 | u32 residency; | |
2899 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2900 | |
2901 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2902 | &entry_latency); | |
2903 | if (err) { | |
ea11e94b | 2904 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2905 | state_node); |
30f60428 LI |
2906 | return -EINVAL; |
2907 | } | |
2908 | ||
2909 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2910 | &exit_latency); | |
2911 | if (err) { | |
ea11e94b | 2912 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2913 | state_node); |
30f60428 LI |
2914 | return -EINVAL; |
2915 | } | |
2916 | ||
2917 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2918 | if (!err) | |
2919 | genpd_state->residency_ns = 1000 * residency; | |
2920 | ||
2921 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2922 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2923 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2924 | |
2925 | return 0; | |
2926 | } | |
2927 | ||
a3381e3a UH |
2928 | static int genpd_iterate_idle_states(struct device_node *dn, |
2929 | struct genpd_power_state *states) | |
2930 | { | |
2931 | int ret; | |
2932 | struct of_phandle_iterator it; | |
2933 | struct device_node *np; | |
2934 | int i = 0; | |
2935 | ||
2936 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2937 | if (ret <= 0) | |
56cb2689 | 2938 | return ret == -ENOENT ? 0 : ret; |
a3381e3a UH |
2939 | |
2940 | /* Loop over the phandles until all the requested entry is found */ | |
2941 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2942 | np = it.node; | |
2943 | if (!of_match_node(idle_state_match, np)) | |
2944 | continue; | |
e0c57a5c SH |
2945 | |
2946 | if (!of_device_is_available(np)) | |
2947 | continue; | |
2948 | ||
a3381e3a UH |
2949 | if (states) { |
2950 | ret = genpd_parse_state(&states[i], np); | |
2951 | if (ret) { | |
2952 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2953 | np, ret); | |
2954 | of_node_put(np); | |
2955 | return ret; | |
2956 | } | |
2957 | } | |
2958 | i++; | |
2959 | } | |
2960 | ||
2961 | return i; | |
2962 | } | |
2963 | ||
30f60428 LI |
2964 | /** |
2965 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2966 | * | |
2967 | * @dn: The genpd device node | |
2968 | * @states: The pointer to which the state array will be saved. | |
2969 | * @n: The count of elements in the array returned from this function. | |
2970 | * | |
2971 | * Returns the device states parsed from the OF node. The memory for the states | |
2972 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2973 | * free the memory after use. If any or zero compatible domain idle states is |
2974 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2975 | */ |
2976 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2977 | struct genpd_power_state **states, int *n) | |
2978 | { | |
2979 | struct genpd_power_state *st; | |
a3381e3a | 2980 | int ret; |
30f60428 | 2981 | |
a3381e3a | 2982 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2983 | if (ret < 0) |
2984 | return ret; | |
2985 | ||
2986 | if (!ret) { | |
2987 | *states = NULL; | |
2988 | *n = 0; | |
2989 | return 0; | |
2990 | } | |
30f60428 | 2991 | |
a3381e3a | 2992 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2993 | if (!st) |
2994 | return -ENOMEM; | |
2995 | ||
a3381e3a UH |
2996 | ret = genpd_iterate_idle_states(dn, st); |
2997 | if (ret <= 0) { | |
2998 | kfree(st); | |
2999 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
3000 | } |
3001 | ||
a3381e3a UH |
3002 | *states = st; |
3003 | *n = ret; | |
30f60428 LI |
3004 | |
3005 | return 0; | |
3006 | } | |
3007 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
3008 | ||
e38f89d3 VK |
3009 | /** |
3010 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
3011 | * | |
3012 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
3013 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
3014 | * state. | |
3015 | * | |
3016 | * Returns performance state encoded in the OPP of the genpd. This calls | |
3017 | * platform specific genpd->opp_to_performance_state() callback to translate | |
3018 | * power domain OPP to performance state. | |
3019 | * | |
3020 | * Returns performance state on success and 0 on failure. | |
3021 | */ | |
3022 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
3023 | struct dev_pm_opp *opp) | |
3024 | { | |
3025 | struct generic_pm_domain *genpd = NULL; | |
3026 | int state; | |
3027 | ||
3028 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
3029 | ||
3030 | if (unlikely(!genpd->opp_to_performance_state)) | |
3031 | return 0; | |
3032 | ||
3033 | genpd_lock(genpd); | |
3034 | state = genpd->opp_to_performance_state(genpd, opp); | |
3035 | genpd_unlock(genpd); | |
3036 | ||
3037 | return state; | |
3038 | } | |
3039 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
3040 | ||
3c095f32 UH |
3041 | static int __init genpd_bus_init(void) |
3042 | { | |
3043 | return bus_register(&genpd_bus_type); | |
3044 | } | |
3045 | core_initcall(genpd_bus_init); | |
3046 | ||
d30d819d | 3047 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
3048 | |
3049 | ||
3050 | /*** debugfs support ***/ | |
3051 | ||
8b0510b5 | 3052 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
3053 | /* |
3054 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 3055 | * from sysfs.c, so generalize it. |
2bd5306a | 3056 | */ |
2bd5306a MM |
3057 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
3058 | { | |
3059 | static const char * const status_lookup[] = { | |
3060 | [RPM_ACTIVE] = "active", | |
3061 | [RPM_RESUMING] = "resuming", | |
3062 | [RPM_SUSPENDED] = "suspended", | |
3063 | [RPM_SUSPENDING] = "suspending" | |
3064 | }; | |
3065 | const char *p = ""; | |
3066 | ||
3067 | if (dev->power.runtime_error) | |
3068 | p = "error"; | |
3069 | else if (dev->power.disable_depth) | |
3070 | p = "unsupported"; | |
3071 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
3072 | p = status_lookup[dev->power.runtime_status]; | |
3073 | else | |
3074 | WARN_ON(1); | |
3075 | ||
45fbc464 DO |
3076 | seq_printf(s, "%-25s ", p); |
3077 | } | |
3078 | ||
3079 | static void perf_status_str(struct seq_file *s, struct device *dev) | |
3080 | { | |
3081 | struct generic_pm_domain_data *gpd_data; | |
3082 | ||
3083 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
3084 | seq_put_decimal_ull(s, "", gpd_data->performance_state); | |
2bd5306a | 3085 | } |
2bd5306a | 3086 | |
9e9704ea UH |
3087 | static int genpd_summary_one(struct seq_file *s, |
3088 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
3089 | { |
3090 | static const char * const status_lookup[] = { | |
49f618e1 UH |
3091 | [GENPD_STATE_ON] = "on", |
3092 | [GENPD_STATE_OFF] = "off" | |
2bd5306a MM |
3093 | }; |
3094 | struct pm_domain_data *pm_data; | |
3095 | const char *kobj_path; | |
3096 | struct gpd_link *link; | |
6954d432 | 3097 | char state[16]; |
2bd5306a MM |
3098 | int ret; |
3099 | ||
35241d12 | 3100 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
3101 | if (ret) |
3102 | return -ERESTARTSYS; | |
3103 | ||
66a5ca4b | 3104 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 3105 | goto exit; |
41e2c8e0 | 3106 | if (!genpd_status_on(genpd)) |
0ba554e4 | 3107 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 3108 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 3109 | else |
6954d432 GU |
3110 | snprintf(state, sizeof(state), "%s", |
3111 | status_lookup[genpd->status]); | |
45fbc464 | 3112 | seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state); |
2bd5306a MM |
3113 | |
3114 | /* | |
3115 | * Modifications on the list require holding locks on both | |
8d87ae48 | 3116 | * parent and child, so we are safe. |
66a5ca4b | 3117 | * Also genpd->name is immutable. |
2bd5306a | 3118 | */ |
8d87ae48 | 3119 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
45fbc464 DO |
3120 | if (list_is_first(&link->parent_node, &genpd->parent_links)) |
3121 | seq_printf(s, "\n%48s", " "); | |
8d87ae48 KC |
3122 | seq_printf(s, "%s", link->child->name); |
3123 | if (!list_is_last(&link->parent_node, &genpd->parent_links)) | |
2bd5306a MM |
3124 | seq_puts(s, ", "); |
3125 | } | |
3126 | ||
66a5ca4b | 3127 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
3128 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
3129 | genpd_is_irq_safe(genpd) ? | |
3130 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
3131 | if (kobj_path == NULL) |
3132 | continue; | |
3133 | ||
3134 | seq_printf(s, "\n %-50s ", kobj_path); | |
3135 | rtpm_status_str(s, pm_data->dev); | |
45fbc464 | 3136 | perf_status_str(s, pm_data->dev); |
2bd5306a MM |
3137 | kfree(kobj_path); |
3138 | } | |
3139 | ||
3140 | seq_puts(s, "\n"); | |
3141 | exit: | |
35241d12 | 3142 | genpd_unlock(genpd); |
2bd5306a MM |
3143 | |
3144 | return 0; | |
3145 | } | |
3146 | ||
d32dcc6c | 3147 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 3148 | { |
66a5ca4b | 3149 | struct generic_pm_domain *genpd; |
2bd5306a MM |
3150 | int ret = 0; |
3151 | ||
45fbc464 | 3152 | seq_puts(s, "domain status children performance\n"); |
15dec67a | 3153 | seq_puts(s, " /device runtime status\n"); |
45fbc464 | 3154 | seq_puts(s, "----------------------------------------------------------------------------------------------\n"); |
2bd5306a MM |
3155 | |
3156 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
3157 | if (ret) | |
3158 | return -ERESTARTSYS; | |
3159 | ||
66a5ca4b | 3160 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3161 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
3162 | if (ret) |
3163 | break; | |
3164 | } | |
3165 | mutex_unlock(&gpd_list_lock); | |
3166 | ||
3167 | return ret; | |
3168 | } | |
3169 | ||
d32dcc6c | 3170 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 3171 | { |
b6a1d093 | 3172 | static const char * const status_lookup[] = { |
49f618e1 UH |
3173 | [GENPD_STATE_ON] = "on", |
3174 | [GENPD_STATE_OFF] = "off" | |
b6a1d093 TG |
3175 | }; |
3176 | ||
3177 | struct generic_pm_domain *genpd = s->private; | |
3178 | int ret = 0; | |
3179 | ||
3180 | ret = genpd_lock_interruptible(genpd); | |
3181 | if (ret) | |
3182 | return -ERESTARTSYS; | |
3183 | ||
3184 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
3185 | goto exit; | |
3186 | ||
49f618e1 | 3187 | if (genpd->status == GENPD_STATE_OFF) |
b6a1d093 TG |
3188 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
3189 | genpd->state_idx); | |
3190 | else | |
3191 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
3192 | exit: | |
3193 | genpd_unlock(genpd); | |
3194 | return ret; | |
2bd5306a MM |
3195 | } |
3196 | ||
d32dcc6c | 3197 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3198 | { |
3199 | struct generic_pm_domain *genpd = s->private; | |
3200 | struct gpd_link *link; | |
3201 | int ret = 0; | |
3202 | ||
3203 | ret = genpd_lock_interruptible(genpd); | |
3204 | if (ret) | |
3205 | return -ERESTARTSYS; | |
3206 | ||
8d87ae48 KC |
3207 | list_for_each_entry(link, &genpd->parent_links, parent_node) |
3208 | seq_printf(s, "%s\n", link->child->name); | |
b6a1d093 TG |
3209 | |
3210 | genpd_unlock(genpd); | |
3211 | return ret; | |
3212 | } | |
3213 | ||
d32dcc6c | 3214 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3215 | { |
3216 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3217 | u64 now, delta, idle_time = 0; |
b6a1d093 TG |
3218 | unsigned int i; |
3219 | int ret = 0; | |
3220 | ||
3221 | ret = genpd_lock_interruptible(genpd); | |
3222 | if (ret) | |
3223 | return -ERESTARTSYS; | |
3224 | ||
c6a113b5 | 3225 | seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
b6a1d093 TG |
3226 | |
3227 | for (i = 0; i < genpd->state_count; i++) { | |
bd40cbb0 | 3228 | idle_time += genpd->states[i].idle_time; |
b6a1d093 | 3229 | |
bd40cbb0 UH |
3230 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
3231 | now = ktime_get_mono_fast_ns(); | |
3232 | if (now > genpd->accounting_time) { | |
3233 | delta = now - genpd->accounting_time; | |
3234 | idle_time += delta; | |
3235 | } | |
3236 | } | |
b6a1d093 | 3237 | |
bd40cbb0 UH |
3238 | do_div(idle_time, NSEC_PER_MSEC); |
3239 | seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time, | |
3240 | genpd->states[i].usage, genpd->states[i].rejected); | |
b6a1d093 TG |
3241 | } |
3242 | ||
3243 | genpd_unlock(genpd); | |
3244 | return ret; | |
3245 | } | |
3246 | ||
d32dcc6c | 3247 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3248 | { |
3249 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3250 | u64 now, on_time, delta = 0; |
b6a1d093 TG |
3251 | int ret = 0; |
3252 | ||
3253 | ret = genpd_lock_interruptible(genpd); | |
3254 | if (ret) | |
3255 | return -ERESTARTSYS; | |
3256 | ||
bd40cbb0 UH |
3257 | if (genpd->status == GENPD_STATE_ON) { |
3258 | now = ktime_get_mono_fast_ns(); | |
3259 | if (now > genpd->accounting_time) | |
3260 | delta = now - genpd->accounting_time; | |
3261 | } | |
b6a1d093 | 3262 | |
bd40cbb0 UH |
3263 | on_time = genpd->on_time + delta; |
3264 | do_div(on_time, NSEC_PER_MSEC); | |
3265 | seq_printf(s, "%llu ms\n", on_time); | |
b6a1d093 TG |
3266 | |
3267 | genpd_unlock(genpd); | |
3268 | return ret; | |
3269 | } | |
3270 | ||
d32dcc6c | 3271 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3272 | { |
3273 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3274 | u64 now, delta, total = 0; |
b6a1d093 TG |
3275 | unsigned int i; |
3276 | int ret = 0; | |
3277 | ||
3278 | ret = genpd_lock_interruptible(genpd); | |
3279 | if (ret) | |
3280 | return -ERESTARTSYS; | |
3281 | ||
3282 | for (i = 0; i < genpd->state_count; i++) { | |
bd40cbb0 | 3283 | total += genpd->states[i].idle_time; |
b6a1d093 | 3284 | |
bd40cbb0 UH |
3285 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
3286 | now = ktime_get_mono_fast_ns(); | |
3287 | if (now > genpd->accounting_time) { | |
3288 | delta = now - genpd->accounting_time; | |
3289 | total += delta; | |
3290 | } | |
3291 | } | |
b6a1d093 | 3292 | } |
b6a1d093 | 3293 | |
bd40cbb0 UH |
3294 | do_div(total, NSEC_PER_MSEC); |
3295 | seq_printf(s, "%llu ms\n", total); | |
b6a1d093 TG |
3296 | |
3297 | genpd_unlock(genpd); | |
3298 | return ret; | |
3299 | } | |
3300 | ||
3301 | ||
d32dcc6c | 3302 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3303 | { |
3304 | struct generic_pm_domain *genpd = s->private; | |
3305 | struct pm_domain_data *pm_data; | |
3306 | const char *kobj_path; | |
3307 | int ret = 0; | |
3308 | ||
3309 | ret = genpd_lock_interruptible(genpd); | |
3310 | if (ret) | |
3311 | return -ERESTARTSYS; | |
3312 | ||
3313 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
3314 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
3315 | genpd_is_irq_safe(genpd) ? | |
3316 | GFP_ATOMIC : GFP_KERNEL); | |
3317 | if (kobj_path == NULL) | |
3318 | continue; | |
3319 | ||
3320 | seq_printf(s, "%s\n", kobj_path); | |
3321 | kfree(kobj_path); | |
3322 | } | |
3323 | ||
3324 | genpd_unlock(genpd); | |
3325 | return ret; | |
3326 | } | |
3327 | ||
d32dcc6c | 3328 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
3329 | { |
3330 | struct generic_pm_domain *genpd = s->private; | |
3331 | ||
3332 | if (genpd_lock_interruptible(genpd)) | |
3333 | return -ERESTARTSYS; | |
3334 | ||
3335 | seq_printf(s, "%u\n", genpd->performance_state); | |
3336 | ||
3337 | genpd_unlock(genpd); | |
3338 | return 0; | |
3339 | } | |
3340 | ||
d32dcc6c YL |
3341 | DEFINE_SHOW_ATTRIBUTE(summary); |
3342 | DEFINE_SHOW_ATTRIBUTE(status); | |
3343 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3344 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3345 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3346 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3347 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3348 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3349 | |
718072ce | 3350 | static void genpd_debug_add(struct generic_pm_domain *genpd) |
2bd5306a MM |
3351 | { |
3352 | struct dentry *d; | |
718072ce TS |
3353 | |
3354 | if (!genpd_debugfs_dir) | |
3355 | return; | |
3356 | ||
3357 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); | |
3358 | ||
3359 | debugfs_create_file("current_state", 0444, | |
3360 | d, genpd, &status_fops); | |
3361 | debugfs_create_file("sub_domains", 0444, | |
3362 | d, genpd, &sub_domains_fops); | |
3363 | debugfs_create_file("idle_states", 0444, | |
3364 | d, genpd, &idle_states_fops); | |
3365 | debugfs_create_file("active_time", 0444, | |
3366 | d, genpd, &active_time_fops); | |
3367 | debugfs_create_file("total_idle_time", 0444, | |
3368 | d, genpd, &total_idle_time_fops); | |
3369 | debugfs_create_file("devices", 0444, | |
3370 | d, genpd, &devices_fops); | |
3371 | if (genpd->set_performance_state) | |
3372 | debugfs_create_file("perf_state", 0444, | |
3373 | d, genpd, &perf_state_fops); | |
3374 | } | |
3375 | ||
3376 | static int __init genpd_debug_init(void) | |
3377 | { | |
b6a1d093 | 3378 | struct generic_pm_domain *genpd; |
2bd5306a | 3379 | |
9e9704ea | 3380 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3381 | |
e16a42c3 GKH |
3382 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3383 | NULL, &summary_fops); | |
2bd5306a | 3384 | |
718072ce TS |
3385 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
3386 | genpd_debug_add(genpd); | |
b6a1d093 | 3387 | |
2bd5306a MM |
3388 | return 0; |
3389 | } | |
9e9704ea | 3390 | late_initcall(genpd_debug_init); |
2bd5306a | 3391 | |
9e9704ea | 3392 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3393 | { |
9e9704ea | 3394 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3395 | } |
9e9704ea | 3396 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3397 | #endif /* CONFIG_DEBUG_FS */ |