Commit | Line | Data |
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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 LI |
133 | |
134 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 135 | const struct generic_pm_domain *genpd) |
d716f479 LI |
136 | { |
137 | bool ret; | |
138 | ||
139 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
140 | ||
075c37d5 UH |
141 | /* |
142 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
143 | * to indicate a suboptimal configuration for PM. For an always on | |
144 | * domain this isn't case, thus don't warn. | |
145 | */ | |
146 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
147 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
148 | genpd->name); | |
149 | ||
150 | return ret; | |
151 | } | |
152 | ||
b3ad17c0 UH |
153 | static int genpd_runtime_suspend(struct device *dev); |
154 | ||
446d999c RK |
155 | /* |
156 | * Get the generic PM domain for a particular struct device. | |
157 | * This validates the struct device pointer, the PM domain pointer, | |
158 | * and checks that the PM domain pointer is a real generic PM domain. | |
159 | * Any failure results in NULL being returned. | |
160 | */ | |
b3ad17c0 | 161 | static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
446d999c | 162 | { |
446d999c RK |
163 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
164 | return NULL; | |
165 | ||
b3ad17c0 UH |
166 | /* A genpd's always have its ->runtime_suspend() callback assigned. */ |
167 | if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) | |
168 | return pd_to_genpd(dev->pm_domain); | |
446d999c | 169 | |
b3ad17c0 | 170 | return NULL; |
446d999c RK |
171 | } |
172 | ||
173 | /* | |
174 | * This should only be used where we are certain that the pm_domain | |
175 | * attached to the device is a genpd domain. | |
176 | */ | |
177 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
178 | { |
179 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
180 | return ERR_PTR(-EINVAL); | |
181 | ||
596ba34b | 182 | return pd_to_genpd(dev->pm_domain); |
5248051b | 183 | } |
f721889f | 184 | |
d8600c8b KK |
185 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
186 | struct device *dev) | |
d5e4cbfe | 187 | { |
2b1d88cd | 188 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
189 | } |
190 | ||
d8600c8b KK |
191 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
192 | struct device *dev) | |
d5e4cbfe | 193 | { |
2b1d88cd | 194 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
195 | } |
196 | ||
c4bb3160 | 197 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 198 | { |
c4bb3160 RW |
199 | bool ret = false; |
200 | ||
201 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
202 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
203 | ||
204 | return ret; | |
205 | } | |
206 | ||
207 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
208 | { | |
209 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 210 | smp_mb__after_atomic(); |
f721889f RW |
211 | } |
212 | ||
afece3ab | 213 | #ifdef CONFIG_DEBUG_FS |
718072ce TS |
214 | static struct dentry *genpd_debugfs_dir; |
215 | ||
216 | static void genpd_debug_add(struct generic_pm_domain *genpd); | |
217 | ||
218 | static void genpd_debug_remove(struct generic_pm_domain *genpd) | |
219 | { | |
220 | struct dentry *d; | |
221 | ||
222 | d = debugfs_lookup(genpd->name, genpd_debugfs_dir); | |
223 | debugfs_remove(d); | |
224 | } | |
225 | ||
afece3ab TG |
226 | static void genpd_update_accounting(struct generic_pm_domain *genpd) |
227 | { | |
228 | ktime_t delta, now; | |
229 | ||
230 | now = ktime_get(); | |
231 | delta = ktime_sub(now, genpd->accounting_time); | |
232 | ||
233 | /* | |
234 | * If genpd->status is active, it means we are just | |
235 | * out of off and so update the idle time and vice | |
236 | * versa. | |
237 | */ | |
49f618e1 | 238 | if (genpd->status == GENPD_STATE_ON) { |
afece3ab TG |
239 | int state_idx = genpd->state_idx; |
240 | ||
241 | genpd->states[state_idx].idle_time = | |
242 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
243 | } else { | |
244 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
245 | } | |
246 | ||
247 | genpd->accounting_time = now; | |
248 | } | |
249 | #else | |
718072ce TS |
250 | static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} |
251 | static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} | |
afece3ab TG |
252 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
253 | #endif | |
254 | ||
cd50c6d3 VK |
255 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
256 | unsigned int state) | |
257 | { | |
258 | struct generic_pm_domain_data *pd_data; | |
259 | struct pm_domain_data *pdd; | |
18edf49c | 260 | struct gpd_link *link; |
cd50c6d3 VK |
261 | |
262 | /* New requested state is same as Max requested state */ | |
263 | if (state == genpd->performance_state) | |
264 | return state; | |
265 | ||
266 | /* New requested state is higher than Max requested state */ | |
267 | if (state > genpd->performance_state) | |
268 | return state; | |
269 | ||
270 | /* Traverse all devices within the domain */ | |
271 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
272 | pd_data = to_gpd_data(pdd); | |
273 | ||
274 | if (pd_data->performance_state > state) | |
275 | state = pd_data->performance_state; | |
276 | } | |
277 | ||
278 | /* | |
18edf49c VK |
279 | * Traverse all sub-domains within the domain. This can be |
280 | * done without any additional locking as the link->performance_state | |
8d87ae48 | 281 | * field is protected by the parent genpd->lock, which is already taken. |
18edf49c VK |
282 | * |
283 | * Also note that link->performance_state (subdomain's performance state | |
8d87ae48 KC |
284 | * requirement to parent domain) is different from |
285 | * link->child->performance_state (current performance state requirement | |
18edf49c VK |
286 | * of the devices/sub-domains of the subdomain) and so can have a |
287 | * different value. | |
288 | * | |
289 | * Note that we also take vote from powered-off sub-domains into account | |
290 | * as the same is done for devices right now. | |
cd50c6d3 | 291 | */ |
8d87ae48 | 292 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
18edf49c VK |
293 | if (link->performance_state > state) |
294 | state = link->performance_state; | |
295 | } | |
296 | ||
cd50c6d3 VK |
297 | return state; |
298 | } | |
299 | ||
079c42a0 DO |
300 | static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, |
301 | struct generic_pm_domain *parent, | |
302 | unsigned int pstate) | |
303 | { | |
304 | if (!parent->set_performance_state) | |
305 | return pstate; | |
306 | ||
307 | return dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
308 | parent->opp_table, | |
309 | pstate); | |
310 | } | |
311 | ||
cd50c6d3 | 312 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
18edf49c | 313 | unsigned int state, int depth) |
cd50c6d3 | 314 | { |
8d87ae48 | 315 | struct generic_pm_domain *parent; |
18edf49c | 316 | struct gpd_link *link; |
8d87ae48 | 317 | int parent_state, ret; |
cd50c6d3 VK |
318 | |
319 | if (state == genpd->performance_state) | |
320 | return 0; | |
321 | ||
8d87ae48 KC |
322 | /* Propagate to parents of genpd */ |
323 | list_for_each_entry(link, &genpd->child_links, child_node) { | |
324 | parent = link->parent; | |
18edf49c | 325 | |
8d87ae48 | 326 | /* Find parent's performance state */ |
079c42a0 | 327 | ret = genpd_xlate_performance_state(genpd, parent, state); |
18edf49c VK |
328 | if (unlikely(ret < 0)) |
329 | goto err; | |
330 | ||
8d87ae48 | 331 | parent_state = ret; |
18edf49c | 332 | |
8d87ae48 | 333 | genpd_lock_nested(parent, depth + 1); |
18edf49c VK |
334 | |
335 | link->prev_performance_state = link->performance_state; | |
8d87ae48 KC |
336 | link->performance_state = parent_state; |
337 | parent_state = _genpd_reeval_performance_state(parent, | |
338 | parent_state); | |
339 | ret = _genpd_set_performance_state(parent, parent_state, depth + 1); | |
18edf49c VK |
340 | if (ret) |
341 | link->performance_state = link->prev_performance_state; | |
342 | ||
8d87ae48 | 343 | genpd_unlock(parent); |
18edf49c VK |
344 | |
345 | if (ret) | |
346 | goto err; | |
347 | } | |
348 | ||
079c42a0 DO |
349 | if (genpd->set_performance_state) { |
350 | ret = genpd->set_performance_state(genpd, state); | |
351 | if (ret) | |
352 | goto err; | |
353 | } | |
cd50c6d3 VK |
354 | |
355 | genpd->performance_state = state; | |
356 | return 0; | |
18edf49c VK |
357 | |
358 | err: | |
359 | /* Encountered an error, lets rollback */ | |
8d87ae48 KC |
360 | list_for_each_entry_continue_reverse(link, &genpd->child_links, |
361 | child_node) { | |
362 | parent = link->parent; | |
18edf49c | 363 | |
8d87ae48 | 364 | genpd_lock_nested(parent, depth + 1); |
18edf49c | 365 | |
8d87ae48 KC |
366 | parent_state = link->prev_performance_state; |
367 | link->performance_state = parent_state; | |
18edf49c | 368 | |
8d87ae48 KC |
369 | parent_state = _genpd_reeval_performance_state(parent, |
370 | parent_state); | |
371 | if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { | |
18edf49c | 372 | pr_err("%s: Failed to roll back to %d performance state\n", |
8d87ae48 | 373 | parent->name, parent_state); |
18edf49c VK |
374 | } |
375 | ||
8d87ae48 | 376 | genpd_unlock(parent); |
18edf49c VK |
377 | } |
378 | ||
379 | return ret; | |
cd50c6d3 VK |
380 | } |
381 | ||
42f6284a VK |
382 | /** |
383 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
384 | * domain. | |
385 | * | |
386 | * @dev: Device for which the performance-state needs to be set. | |
387 | * @state: Target performance state of the device. This can be set as 0 when the | |
388 | * device doesn't have any performance state constraints left (And so | |
389 | * the device wouldn't participate anymore to find the target | |
390 | * performance state of the genpd). | |
391 | * | |
392 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
393 | * while this routine is getting called. | |
394 | * | |
395 | * Returns 0 on success and negative error values on failures. | |
396 | */ | |
397 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
398 | { | |
399 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 400 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 401 | unsigned int prev; |
cd50c6d3 | 402 | int ret; |
42f6284a | 403 | |
3ea4ca92 UH |
404 | genpd = dev_to_genpd_safe(dev); |
405 | if (!genpd) | |
42f6284a VK |
406 | return -ENODEV; |
407 | ||
e757e7fa YL |
408 | if (WARN_ON(!dev->power.subsys_data || |
409 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 410 | return -EINVAL; |
42f6284a VK |
411 | |
412 | genpd_lock(genpd); | |
413 | ||
414 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
415 | prev = gpd_data->performance_state; | |
416 | gpd_data->performance_state = state; | |
417 | ||
cd50c6d3 | 418 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 419 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 420 | if (ret) |
68de2fe5 | 421 | gpd_data->performance_state = prev; |
42f6284a | 422 | |
42f6284a VK |
423 | genpd_unlock(genpd); |
424 | ||
425 | return ret; | |
426 | } | |
427 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
428 | ||
67e3242e LI |
429 | /** |
430 | * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. | |
431 | * | |
432 | * @dev: Device to handle | |
433 | * @next: impending interrupt/wakeup for the device | |
434 | * | |
435 | * | |
436 | * Allow devices to inform of the next wakeup. It's assumed that the users | |
437 | * guarantee that the genpd wouldn't be detached while this routine is getting | |
438 | * called. Additionally, it's also assumed that @dev isn't runtime suspended | |
439 | * (RPM_SUSPENDED)." | |
440 | * Although devices are expected to update the next_wakeup after the end of | |
441 | * their usecase as well, it is possible the devices themselves may not know | |
442 | * about that, so stale @next will be ignored when powering off the domain. | |
443 | */ | |
444 | void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) | |
445 | { | |
446 | struct generic_pm_domain_data *gpd_data; | |
447 | struct generic_pm_domain *genpd; | |
448 | ||
449 | genpd = dev_to_genpd_safe(dev); | |
450 | if (!genpd) | |
451 | return; | |
452 | ||
453 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
454 | gpd_data->next_wakeup = next; | |
455 | } | |
456 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); | |
457 | ||
86e12eac | 458 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 459 | { |
fc5cbf0c | 460 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
461 | ktime_t time_start; |
462 | s64 elapsed_ns; | |
330e3932 | 463 | int ret; |
d4f81383 UH |
464 | |
465 | /* Notify consumers that we are about to power on. */ | |
330e3932 UH |
466 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
467 | GENPD_NOTIFY_PRE_ON, | |
468 | GENPD_NOTIFY_OFF, NULL); | |
d4f81383 UH |
469 | ret = notifier_to_errno(ret); |
470 | if (ret) | |
330e3932 | 471 | return ret; |
c8f0ea45 GU |
472 | |
473 | if (!genpd->power_on) | |
d4f81383 | 474 | goto out; |
c8f0ea45 | 475 | |
d4f81383 UH |
476 | if (!timed) { |
477 | ret = genpd->power_on(genpd); | |
478 | if (ret) | |
479 | goto err; | |
480 | ||
481 | goto out; | |
482 | } | |
a4630c61 | 483 | |
c8f0ea45 GU |
484 | time_start = ktime_get(); |
485 | ret = genpd->power_on(genpd); | |
486 | if (ret) | |
d4f81383 | 487 | goto err; |
c8f0ea45 GU |
488 | |
489 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 490 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
d4f81383 | 491 | goto out; |
c8f0ea45 | 492 | |
fc5cbf0c | 493 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 494 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
495 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
496 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 | 497 | |
d4f81383 UH |
498 | out: |
499 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); | |
500 | return 0; | |
501 | err: | |
502 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
503 | NULL); | |
c8f0ea45 GU |
504 | return ret; |
505 | } | |
506 | ||
86e12eac | 507 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 508 | { |
fc5cbf0c | 509 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
510 | ktime_t time_start; |
511 | s64 elapsed_ns; | |
330e3932 | 512 | int ret; |
d4f81383 UH |
513 | |
514 | /* Notify consumers that we are about to power off. */ | |
330e3932 UH |
515 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
516 | GENPD_NOTIFY_PRE_OFF, | |
517 | GENPD_NOTIFY_ON, NULL); | |
d4f81383 UH |
518 | ret = notifier_to_errno(ret); |
519 | if (ret) | |
330e3932 | 520 | return ret; |
c8f0ea45 GU |
521 | |
522 | if (!genpd->power_off) | |
d4f81383 UH |
523 | goto out; |
524 | ||
525 | if (!timed) { | |
526 | ret = genpd->power_off(genpd); | |
527 | if (ret) | |
528 | goto busy; | |
c8f0ea45 | 529 | |
d4f81383 UH |
530 | goto out; |
531 | } | |
a4630c61 | 532 | |
c8f0ea45 GU |
533 | time_start = ktime_get(); |
534 | ret = genpd->power_off(genpd); | |
0cec68a9 | 535 | if (ret) |
d4f81383 | 536 | goto busy; |
c8f0ea45 GU |
537 | |
538 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 539 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
d4f81383 | 540 | goto out; |
c8f0ea45 | 541 | |
fc5cbf0c | 542 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 543 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
544 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
545 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 546 | |
d4f81383 UH |
547 | out: |
548 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
549 | NULL); | |
0cec68a9 | 550 | return 0; |
d4f81383 | 551 | busy: |
330e3932 | 552 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
d4f81383 | 553 | return ret; |
c8f0ea45 GU |
554 | } |
555 | ||
29e47e21 | 556 | /** |
86e12eac | 557 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 558 | * @genpd: PM domain to power off. |
29e47e21 | 559 | * |
86e12eac | 560 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
561 | * before. |
562 | */ | |
563 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
564 | { | |
565 | queue_work(pm_wq, &genpd->power_off_work); | |
566 | } | |
567 | ||
1f8728b7 UH |
568 | /** |
569 | * genpd_power_off - Remove power from a given PM domain. | |
570 | * @genpd: PM domain to power down. | |
3c64649d UH |
571 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
572 | * RPM status of the releated device is in an intermediate state, not yet turned | |
573 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
574 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
575 | * |
576 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
577 | * have been powered down, remove power from @genpd. | |
578 | */ | |
2da83545 UH |
579 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
580 | unsigned int depth) | |
1f8728b7 UH |
581 | { |
582 | struct pm_domain_data *pdd; | |
583 | struct gpd_link *link; | |
584 | unsigned int not_suspended = 0; | |
f63816e4 | 585 | int ret; |
1f8728b7 UH |
586 | |
587 | /* | |
588 | * Do not try to power off the domain in the following situations: | |
589 | * (1) The domain is already in the "power off" state. | |
590 | * (2) System suspend is in progress. | |
591 | */ | |
41e2c8e0 | 592 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
593 | return 0; |
594 | ||
ffaa42e8 UH |
595 | /* |
596 | * Abort power off for the PM domain in the following situations: | |
597 | * (1) The domain is configured as always on. | |
598 | * (2) When the domain has a subdomain being powered on. | |
599 | */ | |
ed61e18a LC |
600 | if (genpd_is_always_on(genpd) || |
601 | genpd_is_rpm_always_on(genpd) || | |
602 | atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
603 | return -EBUSY; |
604 | ||
605 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
606 | enum pm_qos_flags_status stat; | |
607 | ||
20f97caf | 608 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
609 | if (stat > PM_QOS_FLAGS_NONE) |
610 | return -EBUSY; | |
611 | ||
612 | /* | |
613 | * Do not allow PM domain to be powered off, when an IRQ safe | |
614 | * device is part of a non-IRQ safe domain. | |
615 | */ | |
616 | if (!pm_runtime_suspended(pdd->dev) || | |
617 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
618 | not_suspended++; | |
619 | } | |
620 | ||
3c64649d | 621 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
622 | return -EBUSY; |
623 | ||
624 | if (genpd->gov && genpd->gov->power_down_ok) { | |
625 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
626 | return -EAGAIN; | |
627 | } | |
628 | ||
2c9b7f87 UH |
629 | /* Default to shallowest state. */ |
630 | if (!genpd->gov) | |
631 | genpd->state_idx = 0; | |
632 | ||
f63816e4 UH |
633 | /* Don't power off, if a child domain is waiting to power on. */ |
634 | if (atomic_read(&genpd->sd_count) > 0) | |
635 | return -EBUSY; | |
1f8728b7 | 636 | |
f63816e4 | 637 | ret = _genpd_power_off(genpd, true); |
c6a113b5 LI |
638 | if (ret) { |
639 | genpd->states[genpd->state_idx].rejected++; | |
f63816e4 | 640 | return ret; |
c6a113b5 | 641 | } |
1f8728b7 | 642 | |
49f618e1 | 643 | genpd->status = GENPD_STATE_OFF; |
afece3ab | 644 | genpd_update_accounting(genpd); |
c6a113b5 | 645 | genpd->states[genpd->state_idx].usage++; |
1f8728b7 | 646 | |
8d87ae48 KC |
647 | list_for_each_entry(link, &genpd->child_links, child_node) { |
648 | genpd_sd_counter_dec(link->parent); | |
649 | genpd_lock_nested(link->parent, depth + 1); | |
650 | genpd_power_off(link->parent, false, depth + 1); | |
651 | genpd_unlock(link->parent); | |
1f8728b7 UH |
652 | } |
653 | ||
654 | return 0; | |
655 | } | |
656 | ||
5248051b | 657 | /** |
8d87ae48 | 658 | * genpd_power_on - Restore power to a given PM domain and its parents. |
5248051b | 659 | * @genpd: PM domain to power up. |
0106ef51 | 660 | * @depth: nesting count for lockdep. |
5248051b | 661 | * |
8d87ae48 | 662 | * Restore power to @genpd and all of its parents so that it is possible to |
5248051b RW |
663 | * resume a device belonging to it. |
664 | */ | |
86e12eac | 665 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 666 | { |
5063ce15 | 667 | struct gpd_link *link; |
5248051b RW |
668 | int ret = 0; |
669 | ||
41e2c8e0 | 670 | if (genpd_status_on(genpd)) |
3f241775 | 671 | return 0; |
5248051b | 672 | |
5063ce15 RW |
673 | /* |
674 | * The list is guaranteed not to change while the loop below is being | |
8d87ae48 | 675 | * executed, unless one of the parents' .power_on() callbacks fiddles |
5063ce15 RW |
676 | * with it. |
677 | */ | |
8d87ae48 KC |
678 | list_for_each_entry(link, &genpd->child_links, child_node) { |
679 | struct generic_pm_domain *parent = link->parent; | |
0106ef51 | 680 | |
8d87ae48 | 681 | genpd_sd_counter_inc(parent); |
0106ef51 | 682 | |
8d87ae48 KC |
683 | genpd_lock_nested(parent, depth + 1); |
684 | ret = genpd_power_on(parent, depth + 1); | |
685 | genpd_unlock(parent); | |
5248051b | 686 | |
5063ce15 | 687 | if (ret) { |
8d87ae48 | 688 | genpd_sd_counter_dec(parent); |
9e08cf42 | 689 | goto err; |
5063ce15 | 690 | } |
5248051b RW |
691 | } |
692 | ||
86e12eac | 693 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
694 | if (ret) |
695 | goto err; | |
5248051b | 696 | |
49f618e1 | 697 | genpd->status = GENPD_STATE_ON; |
afece3ab TG |
698 | genpd_update_accounting(genpd); |
699 | ||
3f241775 | 700 | return 0; |
9e08cf42 RW |
701 | |
702 | err: | |
29e47e21 | 703 | list_for_each_entry_continue_reverse(link, |
8d87ae48 KC |
704 | &genpd->child_links, |
705 | child_node) { | |
706 | genpd_sd_counter_dec(link->parent); | |
707 | genpd_lock_nested(link->parent, depth + 1); | |
708 | genpd_power_off(link->parent, false, depth + 1); | |
709 | genpd_unlock(link->parent); | |
29e47e21 | 710 | } |
9e08cf42 | 711 | |
3f241775 RW |
712 | return ret; |
713 | } | |
714 | ||
ea71c596 UH |
715 | static int genpd_dev_pm_start(struct device *dev) |
716 | { | |
717 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
718 | ||
719 | return genpd_start_dev(genpd, dev); | |
720 | } | |
721 | ||
6ff7bb0d RW |
722 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
723 | unsigned long val, void *ptr) | |
724 | { | |
725 | struct generic_pm_domain_data *gpd_data; | |
726 | struct device *dev; | |
727 | ||
728 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 729 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
730 | |
731 | for (;;) { | |
732 | struct generic_pm_domain *genpd; | |
733 | struct pm_domain_data *pdd; | |
734 | ||
735 | spin_lock_irq(&dev->power.lock); | |
736 | ||
737 | pdd = dev->power.subsys_data ? | |
738 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 739 | if (pdd) { |
6ff7bb0d RW |
740 | to_gpd_data(pdd)->td.constraint_changed = true; |
741 | genpd = dev_to_genpd(dev); | |
742 | } else { | |
743 | genpd = ERR_PTR(-ENODATA); | |
744 | } | |
745 | ||
746 | spin_unlock_irq(&dev->power.lock); | |
747 | ||
748 | if (!IS_ERR(genpd)) { | |
35241d12 | 749 | genpd_lock(genpd); |
6ff7bb0d | 750 | genpd->max_off_time_changed = true; |
35241d12 | 751 | genpd_unlock(genpd); |
6ff7bb0d RW |
752 | } |
753 | ||
754 | dev = dev->parent; | |
755 | if (!dev || dev->power.ignore_children) | |
756 | break; | |
757 | } | |
758 | ||
759 | return NOTIFY_DONE; | |
760 | } | |
761 | ||
f721889f RW |
762 | /** |
763 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
764 | * @work: Work structure used for scheduling the execution of this function. | |
765 | */ | |
766 | static void genpd_power_off_work_fn(struct work_struct *work) | |
767 | { | |
768 | struct generic_pm_domain *genpd; | |
769 | ||
770 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
771 | ||
35241d12 | 772 | genpd_lock(genpd); |
2da83545 | 773 | genpd_power_off(genpd, false, 0); |
35241d12 | 774 | genpd_unlock(genpd); |
f721889f RW |
775 | } |
776 | ||
54eeddbf UH |
777 | /** |
778 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
779 | * @dev: Device to handle. | |
780 | */ | |
781 | static int __genpd_runtime_suspend(struct device *dev) | |
782 | { | |
783 | int (*cb)(struct device *__dev); | |
784 | ||
785 | if (dev->type && dev->type->pm) | |
786 | cb = dev->type->pm->runtime_suspend; | |
787 | else if (dev->class && dev->class->pm) | |
788 | cb = dev->class->pm->runtime_suspend; | |
789 | else if (dev->bus && dev->bus->pm) | |
790 | cb = dev->bus->pm->runtime_suspend; | |
791 | else | |
792 | cb = NULL; | |
793 | ||
794 | if (!cb && dev->driver && dev->driver->pm) | |
795 | cb = dev->driver->pm->runtime_suspend; | |
796 | ||
797 | return cb ? cb(dev) : 0; | |
798 | } | |
799 | ||
800 | /** | |
801 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
802 | * @dev: Device to handle. | |
803 | */ | |
804 | static int __genpd_runtime_resume(struct device *dev) | |
805 | { | |
806 | int (*cb)(struct device *__dev); | |
807 | ||
808 | if (dev->type && dev->type->pm) | |
809 | cb = dev->type->pm->runtime_resume; | |
810 | else if (dev->class && dev->class->pm) | |
811 | cb = dev->class->pm->runtime_resume; | |
812 | else if (dev->bus && dev->bus->pm) | |
813 | cb = dev->bus->pm->runtime_resume; | |
814 | else | |
815 | cb = NULL; | |
816 | ||
817 | if (!cb && dev->driver && dev->driver->pm) | |
818 | cb = dev->driver->pm->runtime_resume; | |
819 | ||
820 | return cb ? cb(dev) : 0; | |
821 | } | |
822 | ||
f721889f | 823 | /** |
795bd2e7 | 824 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
825 | * @dev: Device to suspend. |
826 | * | |
827 | * Carry out a runtime suspend of a device under the assumption that its | |
828 | * pm_domain field points to the domain member of an object of type | |
829 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
830 | */ | |
795bd2e7 | 831 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
832 | { |
833 | struct generic_pm_domain *genpd; | |
9df3921e | 834 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 835 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 836 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
837 | ktime_t time_start; |
838 | s64 elapsed_ns; | |
d5e4cbfe | 839 | int ret; |
f721889f RW |
840 | |
841 | dev_dbg(dev, "%s()\n", __func__); | |
842 | ||
5248051b RW |
843 | genpd = dev_to_genpd(dev); |
844 | if (IS_ERR(genpd)) | |
f721889f RW |
845 | return -EINVAL; |
846 | ||
ffe12855 UH |
847 | /* |
848 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
849 | * callbacks for other purposes than runtime PM. In those scenarios | |
850 | * runtime PM is disabled. Under these circumstances, we shall skip | |
851 | * validating/measuring the PM QoS latency. | |
852 | */ | |
9df3921e UH |
853 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
854 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
855 | return -EBUSY; |
856 | ||
2b1d88cd | 857 | /* Measure suspend latency. */ |
d33d5a6c | 858 | time_start = 0; |
ffe12855 UH |
859 | if (runtime_pm) |
860 | time_start = ktime_get(); | |
2b1d88cd | 861 | |
54eeddbf | 862 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
863 | if (ret) |
864 | return ret; | |
17b75eca | 865 | |
2b1d88cd | 866 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 867 | if (ret) { |
54eeddbf | 868 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
869 | return ret; |
870 | } | |
871 | ||
2b1d88cd | 872 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
873 | if (runtime_pm) { |
874 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
875 | if (elapsed_ns > td->suspend_latency_ns) { | |
876 | td->suspend_latency_ns = elapsed_ns; | |
877 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
878 | elapsed_ns); | |
879 | genpd->max_off_time_changed = true; | |
880 | td->constraint_changed = true; | |
881 | } | |
2b1d88cd UH |
882 | } |
883 | ||
0aa2a221 | 884 | /* |
d716f479 LI |
885 | * If power.irq_safe is set, this routine may be run with |
886 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 887 | */ |
d716f479 | 888 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
889 | return 0; |
890 | ||
35241d12 | 891 | genpd_lock(genpd); |
2da83545 | 892 | genpd_power_off(genpd, true, 0); |
35241d12 | 893 | genpd_unlock(genpd); |
f721889f RW |
894 | |
895 | return 0; | |
896 | } | |
897 | ||
f721889f | 898 | /** |
795bd2e7 | 899 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
900 | * @dev: Device to resume. |
901 | * | |
902 | * Carry out a runtime resume 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_resume(struct device *dev) |
f721889f RW |
907 | { |
908 | struct generic_pm_domain *genpd; | |
2b1d88cd | 909 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 910 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
911 | ktime_t time_start; |
912 | s64 elapsed_ns; | |
f721889f | 913 | int ret; |
ba2bbfbf | 914 | bool timed = true; |
f721889f RW |
915 | |
916 | dev_dbg(dev, "%s()\n", __func__); | |
917 | ||
5248051b RW |
918 | genpd = dev_to_genpd(dev); |
919 | if (IS_ERR(genpd)) | |
f721889f RW |
920 | return -EINVAL; |
921 | ||
d716f479 LI |
922 | /* |
923 | * As we don't power off a non IRQ safe domain, which holds | |
924 | * an IRQ safe device, we don't need to restore power to it. | |
925 | */ | |
926 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
927 | timed = false; |
928 | goto out; | |
929 | } | |
0aa2a221 | 930 | |
35241d12 | 931 | genpd_lock(genpd); |
86e12eac | 932 | ret = genpd_power_on(genpd, 0); |
35241d12 | 933 | genpd_unlock(genpd); |
c6d22b37 | 934 | |
ba2bbfbf UH |
935 | if (ret) |
936 | return ret; | |
c6d22b37 | 937 | |
ba2bbfbf | 938 | out: |
2b1d88cd | 939 | /* Measure resume latency. */ |
ab51e6ba | 940 | time_start = 0; |
ffe12855 | 941 | if (timed && runtime_pm) |
2b1d88cd UH |
942 | time_start = ktime_get(); |
943 | ||
076395ca LP |
944 | ret = genpd_start_dev(genpd, dev); |
945 | if (ret) | |
946 | goto err_poweroff; | |
947 | ||
54eeddbf | 948 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
949 | if (ret) |
950 | goto err_stop; | |
2b1d88cd UH |
951 | |
952 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 953 | if (timed && runtime_pm) { |
2b1d88cd UH |
954 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
955 | if (elapsed_ns > td->resume_latency_ns) { | |
956 | td->resume_latency_ns = elapsed_ns; | |
957 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
958 | elapsed_ns); | |
959 | genpd->max_off_time_changed = true; | |
960 | td->constraint_changed = true; | |
961 | } | |
962 | } | |
17b75eca | 963 | |
f721889f | 964 | return 0; |
076395ca LP |
965 | |
966 | err_stop: | |
967 | genpd_stop_dev(genpd, dev); | |
968 | err_poweroff: | |
6dc466d3 | 969 | if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { |
35241d12 | 970 | genpd_lock(genpd); |
2da83545 | 971 | genpd_power_off(genpd, true, 0); |
35241d12 | 972 | genpd_unlock(genpd); |
076395ca LP |
973 | } |
974 | ||
975 | return ret; | |
f721889f RW |
976 | } |
977 | ||
39ac5ba5 TB |
978 | static bool pd_ignore_unused; |
979 | static int __init pd_ignore_unused_setup(char *__unused) | |
980 | { | |
981 | pd_ignore_unused = true; | |
982 | return 1; | |
983 | } | |
984 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
985 | ||
17f2ae7f | 986 | /** |
86e12eac | 987 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 988 | */ |
86e12eac | 989 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
990 | { |
991 | struct generic_pm_domain *genpd; | |
992 | ||
39ac5ba5 TB |
993 | if (pd_ignore_unused) { |
994 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 995 | return 0; |
39ac5ba5 TB |
996 | } |
997 | ||
17f2ae7f RW |
998 | mutex_lock(&gpd_list_lock); |
999 | ||
1000 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
1001 | genpd_queue_power_off_work(genpd); | |
1002 | ||
1003 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 1004 | |
2fe71dcd UH |
1005 | return 0; |
1006 | } | |
86e12eac | 1007 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 1008 | |
0159ec67 JH |
1009 | #ifdef CONFIG_PM_SLEEP |
1010 | ||
596ba34b | 1011 | /** |
8d87ae48 | 1012 | * genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
596ba34b | 1013 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
1014 | * @use_lock: use the lock. |
1015 | * @depth: nesting count for lockdep. | |
596ba34b RW |
1016 | * |
1017 | * Check if the given PM domain can be powered off (during system suspend or | |
8d87ae48 | 1018 | * hibernation) and do that if so. Also, in that case propagate to its parents. |
596ba34b | 1019 | * |
77f827de | 1020 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1021 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1022 | * these cases the lock must be held. | |
596ba34b | 1023 | */ |
0883ac03 UH |
1024 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
1025 | unsigned int depth) | |
596ba34b | 1026 | { |
5063ce15 | 1027 | struct gpd_link *link; |
596ba34b | 1028 | |
ffaa42e8 | 1029 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
1030 | return; |
1031 | ||
c4bb3160 RW |
1032 | if (genpd->suspended_count != genpd->device_count |
1033 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
1034 | return; |
1035 | ||
fc5cbf0c AH |
1036 | /* Choose the deepest state when suspending */ |
1037 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
1038 | if (_genpd_power_off(genpd, false)) |
1039 | return; | |
596ba34b | 1040 | |
49f618e1 | 1041 | genpd->status = GENPD_STATE_OFF; |
5063ce15 | 1042 | |
8d87ae48 KC |
1043 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1044 | genpd_sd_counter_dec(link->parent); | |
0883ac03 UH |
1045 | |
1046 | if (use_lock) | |
8d87ae48 | 1047 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1048 | |
8d87ae48 | 1049 | genpd_sync_power_off(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1050 | |
1051 | if (use_lock) | |
8d87ae48 | 1052 | genpd_unlock(link->parent); |
596ba34b RW |
1053 | } |
1054 | } | |
1055 | ||
802d8b49 | 1056 | /** |
8d87ae48 | 1057 | * genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
802d8b49 | 1058 | * @genpd: PM domain to power on. |
0883ac03 UH |
1059 | * @use_lock: use the lock. |
1060 | * @depth: nesting count for lockdep. | |
802d8b49 | 1061 | * |
77f827de | 1062 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1063 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1064 | * these cases the lock must be held. | |
802d8b49 | 1065 | */ |
0883ac03 UH |
1066 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1067 | unsigned int depth) | |
802d8b49 RW |
1068 | { |
1069 | struct gpd_link *link; | |
1070 | ||
41e2c8e0 | 1071 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1072 | return; |
1073 | ||
8d87ae48 KC |
1074 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1075 | genpd_sd_counter_inc(link->parent); | |
0883ac03 UH |
1076 | |
1077 | if (use_lock) | |
8d87ae48 | 1078 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1079 | |
8d87ae48 | 1080 | genpd_sync_power_on(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1081 | |
1082 | if (use_lock) | |
8d87ae48 | 1083 | genpd_unlock(link->parent); |
802d8b49 RW |
1084 | } |
1085 | ||
86e12eac | 1086 | _genpd_power_on(genpd, false); |
49f618e1 | 1087 | genpd->status = GENPD_STATE_ON; |
802d8b49 RW |
1088 | } |
1089 | ||
4ecd6e65 RW |
1090 | /** |
1091 | * resume_needed - Check whether to resume a device before system suspend. | |
1092 | * @dev: Device to check. | |
1093 | * @genpd: PM domain the device belongs to. | |
1094 | * | |
1095 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1096 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1097 | * to wake up the system and it has to remain active for this purpose while the |
1098 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1099 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1100 | * by itself (those signals are generated on its behalf by other parts of the | |
1101 | * system). In the latter case it may be necessary to reconfigure the device's | |
1102 | * wakeup settings during system suspend, because it may have been set up to | |
1103 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1104 | * Return 'true' in either of the above cases. | |
1105 | */ | |
d8600c8b KK |
1106 | static bool resume_needed(struct device *dev, |
1107 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1108 | { |
1109 | bool active_wakeup; | |
1110 | ||
1111 | if (!device_can_wakeup(dev)) | |
1112 | return false; | |
1113 | ||
d0af45f1 | 1114 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1115 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1116 | } | |
1117 | ||
596ba34b | 1118 | /** |
9e9704ea | 1119 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1120 | * @dev: Device to start the transition of. |
1121 | * | |
1122 | * Start a power transition of a device (during a system-wide power transition) | |
1123 | * under the assumption that its pm_domain field points to the domain member of | |
1124 | * an object of type struct generic_pm_domain representing a PM domain | |
1125 | * consisting of I/O devices. | |
1126 | */ | |
9e9704ea | 1127 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1128 | { |
1129 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1130 | int ret; |
596ba34b RW |
1131 | |
1132 | dev_dbg(dev, "%s()\n", __func__); | |
1133 | ||
1134 | genpd = dev_to_genpd(dev); | |
1135 | if (IS_ERR(genpd)) | |
1136 | return -EINVAL; | |
1137 | ||
17b75eca RW |
1138 | /* |
1139 | * If a wakeup request is pending for the device, it should be woken up | |
1140 | * at this point and a system wakeup event should be reported if it's | |
1141 | * set up to wake up the system from sleep states. | |
1142 | */ | |
4ecd6e65 RW |
1143 | if (resume_needed(dev, genpd)) |
1144 | pm_runtime_resume(dev); | |
1145 | ||
35241d12 | 1146 | genpd_lock(genpd); |
596ba34b | 1147 | |
39dd0f23 | 1148 | if (genpd->prepared_count++ == 0) |
65533bbf | 1149 | genpd->suspended_count = 0; |
17b75eca | 1150 | |
35241d12 | 1151 | genpd_unlock(genpd); |
596ba34b | 1152 | |
b6c10c84 | 1153 | ret = pm_generic_prepare(dev); |
5241ab40 | 1154 | if (ret < 0) { |
35241d12 | 1155 | genpd_lock(genpd); |
b6c10c84 | 1156 | |
39dd0f23 | 1157 | genpd->prepared_count--; |
b6c10c84 | 1158 | |
35241d12 | 1159 | genpd_unlock(genpd); |
b6c10c84 | 1160 | } |
17b75eca | 1161 | |
5241ab40 UH |
1162 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1163 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1164 | } |
1165 | ||
0496c8ae | 1166 | /** |
10da6542 MP |
1167 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1168 | * I/O pm domain. | |
0496c8ae | 1169 | * @dev: Device to suspend. |
10da6542 | 1170 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1171 | * |
1172 | * Stop the device and remove power from the domain if all devices in it have | |
1173 | * been stopped. | |
1174 | */ | |
10da6542 | 1175 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1176 | { |
1177 | struct generic_pm_domain *genpd; | |
a935424b | 1178 | int ret = 0; |
0496c8ae | 1179 | |
0496c8ae RW |
1180 | genpd = dev_to_genpd(dev); |
1181 | if (IS_ERR(genpd)) | |
1182 | return -EINVAL; | |
596ba34b | 1183 | |
10da6542 MP |
1184 | if (poweroff) |
1185 | ret = pm_generic_poweroff_noirq(dev); | |
1186 | else | |
1187 | ret = pm_generic_suspend_noirq(dev); | |
1188 | if (ret) | |
1189 | return ret; | |
1190 | ||
4e1d9a73 | 1191 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
a935424b UH |
1192 | return 0; |
1193 | ||
17218e00 RW |
1194 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1195 | !pm_runtime_status_suspended(dev)) { | |
1196 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1197 | if (ret) { |
1198 | if (poweroff) | |
1199 | pm_generic_restore_noirq(dev); | |
1200 | else | |
1201 | pm_generic_resume_noirq(dev); | |
122a2237 | 1202 | return ret; |
a935424b | 1203 | } |
122a2237 UH |
1204 | } |
1205 | ||
0883ac03 | 1206 | genpd_lock(genpd); |
596ba34b | 1207 | genpd->suspended_count++; |
0883ac03 UH |
1208 | genpd_sync_power_off(genpd, true, 0); |
1209 | genpd_unlock(genpd); | |
596ba34b RW |
1210 | |
1211 | return 0; | |
1212 | } | |
1213 | ||
10da6542 | 1214 | /** |
9e9704ea | 1215 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1216 | * @dev: Device to suspend. |
1217 | * | |
1218 | * Stop the device and remove power from the domain if all devices in it have | |
1219 | * been stopped. | |
1220 | */ | |
9e9704ea | 1221 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1222 | { |
1223 | dev_dbg(dev, "%s()\n", __func__); | |
1224 | ||
1225 | return genpd_finish_suspend(dev, false); | |
1226 | } | |
1227 | ||
596ba34b | 1228 | /** |
9e9704ea | 1229 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1230 | * @dev: Device to resume. |
1231 | * | |
0496c8ae | 1232 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1233 | */ |
9e9704ea | 1234 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1235 | { |
1236 | struct generic_pm_domain *genpd; | |
a935424b | 1237 | int ret; |
596ba34b RW |
1238 | |
1239 | dev_dbg(dev, "%s()\n", __func__); | |
1240 | ||
1241 | genpd = dev_to_genpd(dev); | |
1242 | if (IS_ERR(genpd)) | |
1243 | return -EINVAL; | |
1244 | ||
4e1d9a73 | 1245 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
a935424b | 1246 | return pm_generic_resume_noirq(dev); |
596ba34b | 1247 | |
0883ac03 UH |
1248 | genpd_lock(genpd); |
1249 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1250 | genpd->suspended_count--; |
0883ac03 | 1251 | genpd_unlock(genpd); |
596ba34b | 1252 | |
17218e00 RW |
1253 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1254 | !pm_runtime_status_suspended(dev)) { | |
1255 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1256 | if (ret) |
1257 | return ret; | |
1258 | } | |
122a2237 | 1259 | |
a935424b | 1260 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1261 | } |
1262 | ||
0496c8ae | 1263 | /** |
9e9704ea | 1264 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1265 | * @dev: Device to freeze. |
1266 | * | |
1267 | * Carry out a late freeze of a device under the assumption that its | |
1268 | * pm_domain field points to the domain member of an object of type | |
1269 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1270 | * devices. | |
1271 | */ | |
9e9704ea | 1272 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1273 | { |
d8600c8b | 1274 | const struct generic_pm_domain *genpd; |
122a2237 | 1275 | int ret = 0; |
596ba34b RW |
1276 | |
1277 | dev_dbg(dev, "%s()\n", __func__); | |
1278 | ||
1279 | genpd = dev_to_genpd(dev); | |
1280 | if (IS_ERR(genpd)) | |
1281 | return -EINVAL; | |
1282 | ||
10da6542 MP |
1283 | ret = pm_generic_freeze_noirq(dev); |
1284 | if (ret) | |
1285 | return ret; | |
1286 | ||
17218e00 RW |
1287 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1288 | !pm_runtime_status_suspended(dev)) | |
1289 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1290 | |
1291 | return ret; | |
0496c8ae | 1292 | } |
596ba34b | 1293 | |
0496c8ae | 1294 | /** |
9e9704ea | 1295 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1296 | * @dev: Device to thaw. |
1297 | * | |
1298 | * Start the device, unless power has been removed from the domain already | |
1299 | * before the system transition. | |
1300 | */ | |
9e9704ea | 1301 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1302 | { |
d8600c8b | 1303 | const struct generic_pm_domain *genpd; |
122a2237 | 1304 | int ret = 0; |
596ba34b | 1305 | |
0496c8ae | 1306 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1307 | |
0496c8ae RW |
1308 | genpd = dev_to_genpd(dev); |
1309 | if (IS_ERR(genpd)) | |
1310 | return -EINVAL; | |
1311 | ||
17218e00 RW |
1312 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1313 | !pm_runtime_status_suspended(dev)) { | |
1314 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1315 | if (ret) |
1316 | return ret; | |
1317 | } | |
122a2237 | 1318 | |
10da6542 MP |
1319 | return pm_generic_thaw_noirq(dev); |
1320 | } | |
1321 | ||
1322 | /** | |
9e9704ea | 1323 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1324 | * I/O PM domain. |
1325 | * @dev: Device to poweroff. | |
1326 | * | |
1327 | * Stop the device and remove power from the domain if all devices in it have | |
1328 | * been stopped. | |
1329 | */ | |
9e9704ea | 1330 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1331 | { |
1332 | dev_dbg(dev, "%s()\n", __func__); | |
1333 | ||
1334 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1335 | } |
1336 | ||
596ba34b | 1337 | /** |
9e9704ea | 1338 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1339 | * @dev: Device to resume. |
1340 | * | |
0496c8ae RW |
1341 | * Make sure the domain will be in the same power state as before the |
1342 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1343 | */ |
9e9704ea | 1344 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1345 | { |
1346 | struct generic_pm_domain *genpd; | |
122a2237 | 1347 | int ret = 0; |
596ba34b RW |
1348 | |
1349 | dev_dbg(dev, "%s()\n", __func__); | |
1350 | ||
1351 | genpd = dev_to_genpd(dev); | |
1352 | if (IS_ERR(genpd)) | |
1353 | return -EINVAL; | |
1354 | ||
1355 | /* | |
65533bbf RW |
1356 | * At this point suspended_count == 0 means we are being run for the |
1357 | * first time for the given domain in the present cycle. | |
596ba34b | 1358 | */ |
0883ac03 | 1359 | genpd_lock(genpd); |
505a70b7 | 1360 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1361 | /* |
65533bbf | 1362 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1363 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1364 | * so that it tries to power it on in case it was really off. |
596ba34b | 1365 | */ |
49f618e1 | 1366 | genpd->status = GENPD_STATE_OFF; |
505a70b7 | 1367 | } |
18dd2ece | 1368 | |
0883ac03 UH |
1369 | genpd_sync_power_on(genpd, true, 0); |
1370 | genpd_unlock(genpd); | |
596ba34b | 1371 | |
17218e00 RW |
1372 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1373 | !pm_runtime_status_suspended(dev)) { | |
1374 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1375 | if (ret) |
1376 | return ret; | |
1377 | } | |
122a2237 | 1378 | |
10da6542 | 1379 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1380 | } |
1381 | ||
1382 | /** | |
9e9704ea | 1383 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1384 | * @dev: Device to complete the transition of. |
1385 | * | |
1386 | * Complete a power transition of a device (during a system-wide power | |
1387 | * transition) under the assumption that its pm_domain field points to the | |
1388 | * domain member of an object of type struct generic_pm_domain representing | |
1389 | * a power domain consisting of I/O devices. | |
1390 | */ | |
9e9704ea | 1391 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1392 | { |
1393 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1394 | |
1395 | dev_dbg(dev, "%s()\n", __func__); | |
1396 | ||
1397 | genpd = dev_to_genpd(dev); | |
1398 | if (IS_ERR(genpd)) | |
1399 | return; | |
1400 | ||
4d23a5e8 UH |
1401 | pm_generic_complete(dev); |
1402 | ||
35241d12 | 1403 | genpd_lock(genpd); |
596ba34b | 1404 | |
39dd0f23 | 1405 | genpd->prepared_count--; |
4d23a5e8 UH |
1406 | if (!genpd->prepared_count) |
1407 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1408 | |
35241d12 | 1409 | genpd_unlock(genpd); |
596ba34b RW |
1410 | } |
1411 | ||
fc519890 | 1412 | static void genpd_switch_state(struct device *dev, bool suspend) |
77f827de RW |
1413 | { |
1414 | struct generic_pm_domain *genpd; | |
b9795a3e | 1415 | bool use_lock; |
77f827de | 1416 | |
fe0c2baa UH |
1417 | genpd = dev_to_genpd_safe(dev); |
1418 | if (!genpd) | |
77f827de RW |
1419 | return; |
1420 | ||
b9795a3e UH |
1421 | use_lock = genpd_is_irq_safe(genpd); |
1422 | ||
1423 | if (use_lock) | |
1424 | genpd_lock(genpd); | |
1425 | ||
77f827de RW |
1426 | if (suspend) { |
1427 | genpd->suspended_count++; | |
b9795a3e | 1428 | genpd_sync_power_off(genpd, use_lock, 0); |
77f827de | 1429 | } else { |
b9795a3e | 1430 | genpd_sync_power_on(genpd, use_lock, 0); |
77f827de RW |
1431 | genpd->suspended_count--; |
1432 | } | |
b9795a3e UH |
1433 | |
1434 | if (use_lock) | |
1435 | genpd_unlock(genpd); | |
77f827de | 1436 | } |
d47e6464 | 1437 | |
fc519890 UH |
1438 | /** |
1439 | * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev | |
1440 | * @dev: The device that is attached to the genpd, that can be suspended. | |
1441 | * | |
1442 | * This routine should typically be called for a device that needs to be | |
b9795a3e UH |
1443 | * suspended during the syscore suspend phase. It may also be called during |
1444 | * suspend-to-idle to suspend a corresponding CPU device that is attached to a | |
1445 | * genpd. | |
fc519890 UH |
1446 | */ |
1447 | void dev_pm_genpd_suspend(struct device *dev) | |
d47e6464 | 1448 | { |
fc519890 | 1449 | genpd_switch_state(dev, true); |
d47e6464 | 1450 | } |
fc519890 | 1451 | EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); |
d47e6464 | 1452 | |
fc519890 UH |
1453 | /** |
1454 | * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev | |
1455 | * @dev: The device that is attached to the genpd, which needs to be resumed. | |
1456 | * | |
1457 | * This routine should typically be called for a device that needs to be resumed | |
b9795a3e UH |
1458 | * during the syscore resume phase. It may also be called during suspend-to-idle |
1459 | * to resume a corresponding CPU device that is attached to a genpd. | |
fc519890 UH |
1460 | */ |
1461 | void dev_pm_genpd_resume(struct device *dev) | |
d47e6464 | 1462 | { |
fc519890 | 1463 | genpd_switch_state(dev, false); |
d47e6464 | 1464 | } |
fc519890 | 1465 | EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); |
77f827de | 1466 | |
d30d819d | 1467 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1468 | |
9e9704ea UH |
1469 | #define genpd_prepare NULL |
1470 | #define genpd_suspend_noirq NULL | |
1471 | #define genpd_resume_noirq NULL | |
1472 | #define genpd_freeze_noirq NULL | |
1473 | #define genpd_thaw_noirq NULL | |
1474 | #define genpd_poweroff_noirq NULL | |
1475 | #define genpd_restore_noirq NULL | |
1476 | #define genpd_complete NULL | |
596ba34b RW |
1477 | |
1478 | #endif /* CONFIG_PM_SLEEP */ | |
1479 | ||
a174920d | 1480 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) |
1d5fcfec RW |
1481 | { |
1482 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1483 | int ret; |
1484 | ||
1485 | ret = dev_pm_get_subsys_data(dev); | |
1486 | if (ret) | |
1487 | return ERR_PTR(ret); | |
1d5fcfec RW |
1488 | |
1489 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1490 | if (!gpd_data) { |
1491 | ret = -ENOMEM; | |
1492 | goto err_put; | |
1493 | } | |
1d5fcfec | 1494 | |
f104e1e5 | 1495 | gpd_data->base.dev = dev; |
f104e1e5 | 1496 | gpd_data->td.constraint_changed = true; |
0759e80b | 1497 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 | 1498 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
67e3242e | 1499 | gpd_data->next_wakeup = KTIME_MAX; |
f104e1e5 UH |
1500 | |
1501 | spin_lock_irq(&dev->power.lock); | |
1502 | ||
1503 | if (dev->power.subsys_data->domain_data) { | |
1504 | ret = -EINVAL; | |
1505 | goto err_free; | |
1506 | } | |
1507 | ||
1508 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1509 | |
1510 | spin_unlock_irq(&dev->power.lock); | |
1511 | ||
1d5fcfec | 1512 | return gpd_data; |
3e235685 | 1513 | |
f104e1e5 UH |
1514 | err_free: |
1515 | spin_unlock_irq(&dev->power.lock); | |
1516 | kfree(gpd_data); | |
3e235685 UH |
1517 | err_put: |
1518 | dev_pm_put_subsys_data(dev); | |
1519 | return ERR_PTR(ret); | |
1d5fcfec RW |
1520 | } |
1521 | ||
49d400c7 UH |
1522 | static void genpd_free_dev_data(struct device *dev, |
1523 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1524 | { |
f104e1e5 UH |
1525 | spin_lock_irq(&dev->power.lock); |
1526 | ||
f104e1e5 UH |
1527 | dev->power.subsys_data->domain_data = NULL; |
1528 | ||
1529 | spin_unlock_irq(&dev->power.lock); | |
1530 | ||
1d5fcfec | 1531 | kfree(gpd_data); |
3e235685 | 1532 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1533 | } |
1534 | ||
b24e1965 UH |
1535 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1536 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1537 | { |
1538 | struct gpd_link *link; | |
1539 | ||
1540 | if (!genpd_is_cpu_domain(genpd)) | |
1541 | return; | |
1542 | ||
8d87ae48 KC |
1543 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1544 | struct generic_pm_domain *parent = link->parent; | |
eb594b73 | 1545 | |
8d87ae48 KC |
1546 | genpd_lock_nested(parent, depth + 1); |
1547 | genpd_update_cpumask(parent, cpu, set, depth + 1); | |
1548 | genpd_unlock(parent); | |
eb594b73 UH |
1549 | } |
1550 | ||
1551 | if (set) | |
1552 | cpumask_set_cpu(cpu, genpd->cpus); | |
1553 | else | |
1554 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1555 | } | |
1556 | ||
b24e1965 UH |
1557 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1558 | { | |
1559 | if (cpu >= 0) | |
1560 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1561 | } | |
1562 | ||
1563 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1564 | { | |
1565 | if (cpu >= 0) | |
1566 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1567 | } | |
1568 | ||
1569 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1570 | { |
1571 | int cpu; | |
1572 | ||
1573 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1574 | return -1; |
eb594b73 UH |
1575 | |
1576 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1577 | if (get_cpu_device(cpu) == dev) |
1578 | return cpu; | |
eb594b73 | 1579 | } |
eb594b73 | 1580 | |
b24e1965 | 1581 | return -1; |
eb594b73 UH |
1582 | } |
1583 | ||
f9ccd7c3 UH |
1584 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1585 | struct device *base_dev) | |
f721889f | 1586 | { |
c0356db7 | 1587 | struct generic_pm_domain_data *gpd_data; |
f9ccd7c3 | 1588 | int ret; |
f721889f RW |
1589 | |
1590 | dev_dbg(dev, "%s()\n", __func__); | |
1591 | ||
1592 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1593 | return -EINVAL; | |
1594 | ||
a174920d | 1595 | gpd_data = genpd_alloc_dev_data(dev); |
3e235685 UH |
1596 | if (IS_ERR(gpd_data)) |
1597 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1598 | |
f9ccd7c3 | 1599 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
b24e1965 | 1600 | |
b472c2fa UH |
1601 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1602 | if (ret) | |
1603 | goto out; | |
d79b6fe1 | 1604 | |
2071ac98 JW |
1605 | genpd_lock(genpd); |
1606 | ||
f9ccd7c3 | 1607 | genpd_set_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1608 | dev_pm_domain_set(dev, &genpd->domain); |
1609 | ||
14b53064 UH |
1610 | genpd->device_count++; |
1611 | genpd->max_off_time_changed = true; | |
1612 | ||
1d5fcfec | 1613 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1614 | |
35241d12 | 1615 | genpd_unlock(genpd); |
2071ac98 | 1616 | out: |
c0356db7 UH |
1617 | if (ret) |
1618 | genpd_free_dev_data(dev, gpd_data); | |
1619 | else | |
0b07ee94 VK |
1620 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
1621 | DEV_PM_QOS_RESUME_LATENCY); | |
1d5fcfec | 1622 | |
f721889f RW |
1623 | return ret; |
1624 | } | |
19efa5ff JH |
1625 | |
1626 | /** | |
1a7a6707 | 1627 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1628 | * @genpd: PM domain to add the device to. |
1629 | * @dev: Device to be added. | |
19efa5ff | 1630 | */ |
1a7a6707 | 1631 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1632 | { |
1633 | int ret; | |
1634 | ||
1635 | mutex_lock(&gpd_list_lock); | |
f9ccd7c3 | 1636 | ret = genpd_add_device(genpd, dev, dev); |
19efa5ff JH |
1637 | mutex_unlock(&gpd_list_lock); |
1638 | ||
1639 | return ret; | |
1640 | } | |
1a7a6707 | 1641 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1642 | |
85168d56 UH |
1643 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1644 | struct device *dev) | |
f721889f | 1645 | { |
6ff7bb0d | 1646 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1647 | struct pm_domain_data *pdd; |
f9ccd7c3 | 1648 | int ret = 0; |
f721889f RW |
1649 | |
1650 | dev_dbg(dev, "%s()\n", __func__); | |
1651 | ||
c0356db7 UH |
1652 | pdd = dev->power.subsys_data->domain_data; |
1653 | gpd_data = to_gpd_data(pdd); | |
0b07ee94 VK |
1654 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
1655 | DEV_PM_QOS_RESUME_LATENCY); | |
c0356db7 | 1656 | |
35241d12 | 1657 | genpd_lock(genpd); |
f721889f | 1658 | |
596ba34b RW |
1659 | if (genpd->prepared_count > 0) { |
1660 | ret = -EAGAIN; | |
1661 | goto out; | |
1662 | } | |
1663 | ||
6ff7bb0d RW |
1664 | genpd->device_count--; |
1665 | genpd->max_off_time_changed = true; | |
1666 | ||
f9ccd7c3 | 1667 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1668 | dev_pm_domain_set(dev, NULL); |
1669 | ||
efa69025 | 1670 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1671 | |
35241d12 | 1672 | genpd_unlock(genpd); |
6ff7bb0d | 1673 | |
2071ac98 JW |
1674 | if (genpd->detach_dev) |
1675 | genpd->detach_dev(genpd, dev); | |
1676 | ||
c1dbe2fb | 1677 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1678 | |
6ff7bb0d | 1679 | return 0; |
f721889f | 1680 | |
596ba34b | 1681 | out: |
35241d12 | 1682 | genpd_unlock(genpd); |
0b07ee94 | 1683 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
f721889f RW |
1684 | |
1685 | return ret; | |
1686 | } | |
85168d56 UH |
1687 | |
1688 | /** | |
1689 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1690 | * @dev: Device to be removed. |
1691 | */ | |
924f4486 | 1692 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1693 | { |
b3ad17c0 | 1694 | struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
924f4486 UH |
1695 | |
1696 | if (!genpd) | |
85168d56 UH |
1697 | return -EINVAL; |
1698 | ||
1699 | return genpd_remove_device(genpd, dev); | |
1700 | } | |
24c96dc7 | 1701 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1702 | |
d4f81383 UH |
1703 | /** |
1704 | * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev | |
1705 | * | |
1706 | * @dev: Device that should be associated with the notifier | |
1707 | * @nb: The notifier block to register | |
1708 | * | |
1709 | * Users may call this function to add a genpd power on/off notifier for an | |
1710 | * attached @dev. Only one notifier per device is allowed. The notifier is | |
1711 | * sent when genpd is powering on/off the PM domain. | |
1712 | * | |
1713 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1714 | * while this routine is getting called. | |
1715 | * | |
1716 | * Returns 0 on success and negative error values on failures. | |
1717 | */ | |
1718 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) | |
1719 | { | |
1720 | struct generic_pm_domain *genpd; | |
1721 | struct generic_pm_domain_data *gpd_data; | |
1722 | int ret; | |
1723 | ||
1724 | genpd = dev_to_genpd_safe(dev); | |
1725 | if (!genpd) | |
1726 | return -ENODEV; | |
1727 | ||
1728 | if (WARN_ON(!dev->power.subsys_data || | |
1729 | !dev->power.subsys_data->domain_data)) | |
1730 | return -EINVAL; | |
1731 | ||
1732 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1733 | if (gpd_data->power_nb) | |
1734 | return -EEXIST; | |
1735 | ||
1736 | genpd_lock(genpd); | |
1737 | ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); | |
1738 | genpd_unlock(genpd); | |
1739 | ||
1740 | if (ret) { | |
1741 | dev_warn(dev, "failed to add notifier for PM domain %s\n", | |
1742 | genpd->name); | |
1743 | return ret; | |
1744 | } | |
1745 | ||
1746 | gpd_data->power_nb = nb; | |
1747 | return 0; | |
1748 | } | |
1749 | EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); | |
1750 | ||
1751 | /** | |
1752 | * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev | |
1753 | * | |
1754 | * @dev: Device that is associated with the notifier | |
1755 | * | |
1756 | * Users may call this function to remove a genpd power on/off notifier for an | |
1757 | * attached @dev. | |
1758 | * | |
1759 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1760 | * while this routine is getting called. | |
1761 | * | |
1762 | * Returns 0 on success and negative error values on failures. | |
1763 | */ | |
1764 | int dev_pm_genpd_remove_notifier(struct device *dev) | |
1765 | { | |
1766 | struct generic_pm_domain *genpd; | |
1767 | struct generic_pm_domain_data *gpd_data; | |
1768 | int ret; | |
1769 | ||
1770 | genpd = dev_to_genpd_safe(dev); | |
1771 | if (!genpd) | |
1772 | return -ENODEV; | |
1773 | ||
1774 | if (WARN_ON(!dev->power.subsys_data || | |
1775 | !dev->power.subsys_data->domain_data)) | |
1776 | return -EINVAL; | |
1777 | ||
1778 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1779 | if (!gpd_data->power_nb) | |
1780 | return -ENODEV; | |
1781 | ||
1782 | genpd_lock(genpd); | |
1783 | ret = raw_notifier_chain_unregister(&genpd->power_notifiers, | |
1784 | gpd_data->power_nb); | |
1785 | genpd_unlock(genpd); | |
1786 | ||
1787 | if (ret) { | |
1788 | dev_warn(dev, "failed to remove notifier for PM domain %s\n", | |
1789 | genpd->name); | |
1790 | return ret; | |
1791 | } | |
1792 | ||
1793 | gpd_data->power_nb = NULL; | |
1794 | return 0; | |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); | |
1797 | ||
19efa5ff JH |
1798 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1799 | struct generic_pm_domain *subdomain) | |
f721889f | 1800 | { |
2547923d | 1801 | struct gpd_link *link, *itr; |
f721889f RW |
1802 | int ret = 0; |
1803 | ||
fb7268be RW |
1804 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1805 | || genpd == subdomain) | |
f721889f RW |
1806 | return -EINVAL; |
1807 | ||
d716f479 LI |
1808 | /* |
1809 | * If the domain can be powered on/off in an IRQ safe | |
1810 | * context, ensure that the subdomain can also be | |
1811 | * powered on/off in that context. | |
1812 | */ | |
1813 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1814 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1815 | genpd->name, subdomain->name); |
1816 | return -EINVAL; | |
1817 | } | |
1818 | ||
2547923d LI |
1819 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1820 | if (!link) | |
1821 | return -ENOMEM; | |
1822 | ||
35241d12 LI |
1823 | genpd_lock(subdomain); |
1824 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1825 | |
41e2c8e0 | 1826 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1827 | ret = -EINVAL; |
1828 | goto out; | |
1829 | } | |
1830 | ||
8d87ae48 KC |
1831 | list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
1832 | if (itr->child == subdomain && itr->parent == genpd) { | |
f721889f RW |
1833 | ret = -EINVAL; |
1834 | goto out; | |
1835 | } | |
1836 | } | |
1837 | ||
8d87ae48 KC |
1838 | link->parent = genpd; |
1839 | list_add_tail(&link->parent_node, &genpd->parent_links); | |
1840 | link->child = subdomain; | |
1841 | list_add_tail(&link->child_node, &subdomain->child_links); | |
41e2c8e0 | 1842 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1843 | genpd_sd_counter_inc(genpd); |
f721889f | 1844 | |
f721889f | 1845 | out: |
35241d12 LI |
1846 | genpd_unlock(genpd); |
1847 | genpd_unlock(subdomain); | |
2547923d LI |
1848 | if (ret) |
1849 | kfree(link); | |
f721889f RW |
1850 | return ret; |
1851 | } | |
19efa5ff JH |
1852 | |
1853 | /** | |
1854 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
8d87ae48 | 1855 | * @genpd: Leader PM domain to add the subdomain to. |
19efa5ff JH |
1856 | * @subdomain: Subdomain to be added. |
1857 | */ | |
1858 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1859 | struct generic_pm_domain *subdomain) | |
1860 | { | |
1861 | int ret; | |
1862 | ||
1863 | mutex_lock(&gpd_list_lock); | |
1864 | ret = genpd_add_subdomain(genpd, subdomain); | |
1865 | mutex_unlock(&gpd_list_lock); | |
1866 | ||
1867 | return ret; | |
1868 | } | |
d60ee966 | 1869 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1870 | |
1871 | /** | |
1872 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
8d87ae48 | 1873 | * @genpd: Leader PM domain to remove the subdomain from. |
5063ce15 | 1874 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1875 | */ |
1876 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1877 | struct generic_pm_domain *subdomain) |
f721889f | 1878 | { |
c6e83cac | 1879 | struct gpd_link *l, *link; |
f721889f RW |
1880 | int ret = -EINVAL; |
1881 | ||
5063ce15 | 1882 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1883 | return -EINVAL; |
1884 | ||
35241d12 LI |
1885 | genpd_lock(subdomain); |
1886 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1887 | |
8d87ae48 | 1888 | if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
7a5bd127 JP |
1889 | pr_warn("%s: unable to remove subdomain %s\n", |
1890 | genpd->name, subdomain->name); | |
30e7a65b JH |
1891 | ret = -EBUSY; |
1892 | goto out; | |
1893 | } | |
1894 | ||
8d87ae48 KC |
1895 | list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
1896 | if (link->child != subdomain) | |
f721889f RW |
1897 | continue; |
1898 | ||
8d87ae48 KC |
1899 | list_del(&link->parent_node); |
1900 | list_del(&link->child_node); | |
5063ce15 | 1901 | kfree(link); |
41e2c8e0 | 1902 | if (genpd_status_on(subdomain)) |
f721889f RW |
1903 | genpd_sd_counter_dec(genpd); |
1904 | ||
f721889f RW |
1905 | ret = 0; |
1906 | break; | |
1907 | } | |
1908 | ||
30e7a65b | 1909 | out: |
35241d12 LI |
1910 | genpd_unlock(genpd); |
1911 | genpd_unlock(subdomain); | |
f721889f RW |
1912 | |
1913 | return ret; | |
1914 | } | |
d60ee966 | 1915 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1916 | |
49a27e27 UH |
1917 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1918 | unsigned int state_count) | |
1919 | { | |
1920 | kfree(states); | |
1921 | } | |
1922 | ||
59d65b73 LI |
1923 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1924 | { | |
1925 | struct genpd_power_state *state; | |
1926 | ||
1927 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1928 | if (!state) | |
1929 | return -ENOMEM; | |
1930 | ||
1931 | genpd->states = state; | |
1932 | genpd->state_count = 1; | |
49a27e27 | 1933 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1934 | |
1935 | return 0; | |
1936 | } | |
1937 | ||
d716f479 LI |
1938 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1939 | { | |
1940 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1941 | spin_lock_init(&genpd->slock); | |
1942 | genpd->lock_ops = &genpd_spin_ops; | |
1943 | } else { | |
1944 | mutex_init(&genpd->mlock); | |
1945 | genpd->lock_ops = &genpd_mtx_ops; | |
1946 | } | |
1947 | } | |
1948 | ||
f721889f RW |
1949 | /** |
1950 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1951 | * @genpd: PM domain object to initialize. | |
1952 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1953 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1954 | * |
1955 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1956 | */ |
7eb231c3 UH |
1957 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1958 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1959 | { |
59d65b73 LI |
1960 | int ret; |
1961 | ||
f721889f | 1962 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1963 | return -EINVAL; |
f721889f | 1964 | |
8d87ae48 KC |
1965 | INIT_LIST_HEAD(&genpd->parent_links); |
1966 | INIT_LIST_HEAD(&genpd->child_links); | |
f721889f | 1967 | INIT_LIST_HEAD(&genpd->dev_list); |
d4f81383 | 1968 | RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
d716f479 | 1969 | genpd_lock_init(genpd); |
f721889f RW |
1970 | genpd->gov = gov; |
1971 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1972 | atomic_set(&genpd->sd_count, 0); |
49f618e1 | 1973 | genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
596ba34b | 1974 | genpd->device_count = 0; |
221e9b58 | 1975 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1976 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1977 | genpd->provider = NULL; |
1978 | genpd->has_provider = false; | |
afece3ab | 1979 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1980 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1981 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1982 | genpd->domain.ops.prepare = genpd_prepare; |
1983 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1984 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1985 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1986 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1987 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1988 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1989 | genpd->domain.ops.complete = genpd_complete; | |
ea71c596 | 1990 | genpd->domain.start = genpd_dev_pm_start; |
c11f6f5b UH |
1991 | |
1992 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1993 | genpd->dev_ops.stop = pm_clk_suspend; | |
1994 | genpd->dev_ops.start = pm_clk_resume; | |
1995 | } | |
1996 | ||
ffaa42e8 | 1997 | /* Always-on domains must be powered on at initialization. */ |
ed61e18a LC |
1998 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
1999 | !genpd_status_on(genpd)) | |
ffaa42e8 UH |
2000 | return -EINVAL; |
2001 | ||
eb594b73 UH |
2002 | if (genpd_is_cpu_domain(genpd) && |
2003 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
2004 | return -ENOMEM; | |
2005 | ||
fc5cbf0c | 2006 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
2007 | if (genpd->state_count == 0) { |
2008 | ret = genpd_set_default_power_state(genpd); | |
eb594b73 UH |
2009 | if (ret) { |
2010 | if (genpd_is_cpu_domain(genpd)) | |
2011 | free_cpumask_var(genpd->cpus); | |
59d65b73 | 2012 | return ret; |
eb594b73 | 2013 | } |
46b7fe94 | 2014 | } else if (!gov && genpd->state_count > 1) { |
7a5bd127 | 2015 | pr_warn("%s: no governor for states\n", genpd->name); |
59d65b73 | 2016 | } |
fc5cbf0c | 2017 | |
401ea157 VK |
2018 | device_initialize(&genpd->dev); |
2019 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
2020 | ||
5125bbf3 RW |
2021 | mutex_lock(&gpd_list_lock); |
2022 | list_add(&genpd->gpd_list_node, &gpd_list); | |
718072ce | 2023 | genpd_debug_add(genpd); |
5125bbf3 | 2024 | mutex_unlock(&gpd_list_lock); |
7eb231c3 UH |
2025 | |
2026 | return 0; | |
5125bbf3 | 2027 | } |
be5ed55d | 2028 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 2029 | |
3fe57710 JH |
2030 | static int genpd_remove(struct generic_pm_domain *genpd) |
2031 | { | |
2032 | struct gpd_link *l, *link; | |
2033 | ||
2034 | if (IS_ERR_OR_NULL(genpd)) | |
2035 | return -EINVAL; | |
2036 | ||
35241d12 | 2037 | genpd_lock(genpd); |
3fe57710 JH |
2038 | |
2039 | if (genpd->has_provider) { | |
35241d12 | 2040 | genpd_unlock(genpd); |
3fe57710 JH |
2041 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
2042 | return -EBUSY; | |
2043 | } | |
2044 | ||
8d87ae48 | 2045 | if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
35241d12 | 2046 | genpd_unlock(genpd); |
3fe57710 JH |
2047 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
2048 | return -EBUSY; | |
2049 | } | |
2050 | ||
8d87ae48 KC |
2051 | list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
2052 | list_del(&link->parent_node); | |
2053 | list_del(&link->child_node); | |
3fe57710 JH |
2054 | kfree(link); |
2055 | } | |
2056 | ||
718072ce | 2057 | genpd_debug_remove(genpd); |
3fe57710 | 2058 | list_del(&genpd->gpd_list_node); |
35241d12 | 2059 | genpd_unlock(genpd); |
3fe57710 | 2060 | cancel_work_sync(&genpd->power_off_work); |
eb594b73 UH |
2061 | if (genpd_is_cpu_domain(genpd)) |
2062 | free_cpumask_var(genpd->cpus); | |
49a27e27 UH |
2063 | if (genpd->free_states) |
2064 | genpd->free_states(genpd->states, genpd->state_count); | |
2065 | ||
3fe57710 JH |
2066 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
2067 | ||
2068 | return 0; | |
2069 | } | |
2070 | ||
2071 | /** | |
2072 | * pm_genpd_remove - Remove a generic I/O PM domain | |
2073 | * @genpd: Pointer to PM domain that is to be removed. | |
2074 | * | |
2075 | * To remove the PM domain, this function: | |
2076 | * - Removes the PM domain as a subdomain to any parent domains, | |
2077 | * if it was added. | |
2078 | * - Removes the PM domain from the list of registered PM domains. | |
2079 | * | |
2080 | * The PM domain will only be removed, if the associated provider has | |
2081 | * been removed, it is not a parent to any other PM domain and has no | |
2082 | * devices associated with it. | |
2083 | */ | |
2084 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
2085 | { | |
2086 | int ret; | |
2087 | ||
2088 | mutex_lock(&gpd_list_lock); | |
2089 | ret = genpd_remove(genpd); | |
2090 | mutex_unlock(&gpd_list_lock); | |
2091 | ||
2092 | return ret; | |
2093 | } | |
2094 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
2095 | ||
aa42240a | 2096 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 2097 | |
aa42240a TF |
2098 | /* |
2099 | * Device Tree based PM domain providers. | |
2100 | * | |
2101 | * The code below implements generic device tree based PM domain providers that | |
2102 | * bind device tree nodes with generic PM domains registered in the system. | |
2103 | * | |
2104 | * Any driver that registers generic PM domains and needs to support binding of | |
2105 | * devices to these domains is supposed to register a PM domain provider, which | |
2106 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
2107 | * | |
2108 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
2109 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
2110 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
2111 | * index. |
2112 | */ | |
2113 | ||
2114 | /** | |
2115 | * struct of_genpd_provider - PM domain provider registration structure | |
2116 | * @link: Entry in global list of PM domain providers | |
2117 | * @node: Pointer to device tree node of PM domain provider | |
2118 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
2119 | * into a PM domain. | |
2120 | * @data: context pointer to be passed into @xlate callback | |
2121 | */ | |
2122 | struct of_genpd_provider { | |
2123 | struct list_head link; | |
2124 | struct device_node *node; | |
2125 | genpd_xlate_t xlate; | |
2126 | void *data; | |
2127 | }; | |
2128 | ||
2129 | /* List of registered PM domain providers. */ | |
2130 | static LIST_HEAD(of_genpd_providers); | |
2131 | /* Mutex to protect the list above. */ | |
2132 | static DEFINE_MUTEX(of_genpd_mutex); | |
2133 | ||
2134 | /** | |
892ebdcc | 2135 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
2136 | * @genpdspec: OF phandle args to map into a PM domain |
2137 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
2138 | * | |
2139 | * This is a generic xlate function that can be used to model PM domains that | |
2140 | * have their own device tree nodes. The private data of xlate function needs | |
2141 | * to be a valid pointer to struct generic_pm_domain. | |
2142 | */ | |
892ebdcc | 2143 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
2144 | struct of_phandle_args *genpdspec, |
2145 | void *data) | |
2146 | { | |
aa42240a TF |
2147 | return data; |
2148 | } | |
aa42240a TF |
2149 | |
2150 | /** | |
892ebdcc | 2151 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
2152 | * @genpdspec: OF phandle args to map into a PM domain |
2153 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2154 | * | |
2155 | * This is a generic xlate function that can be used to model simple PM domain | |
2156 | * controllers that have one device tree node and provide multiple PM domains. | |
2157 | * A single cell is used as an index into an array of PM domains specified in | |
2158 | * the genpd_onecell_data struct when registering the provider. | |
2159 | */ | |
892ebdcc | 2160 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
2161 | struct of_phandle_args *genpdspec, |
2162 | void *data) | |
2163 | { | |
2164 | struct genpd_onecell_data *genpd_data = data; | |
2165 | unsigned int idx = genpdspec->args[0]; | |
2166 | ||
2167 | if (genpdspec->args_count != 1) | |
2168 | return ERR_PTR(-EINVAL); | |
2169 | ||
2170 | if (idx >= genpd_data->num_domains) { | |
2171 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2172 | return ERR_PTR(-EINVAL); | |
2173 | } | |
2174 | ||
2175 | if (!genpd_data->domains[idx]) | |
2176 | return ERR_PTR(-ENOENT); | |
2177 | ||
2178 | return genpd_data->domains[idx]; | |
2179 | } | |
aa42240a TF |
2180 | |
2181 | /** | |
892ebdcc | 2182 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
2183 | * @np: Device node pointer associated with the PM domain provider. |
2184 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2185 | * @data: Context pointer for @xlate callback. | |
2186 | */ | |
892ebdcc JH |
2187 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2188 | void *data) | |
aa42240a TF |
2189 | { |
2190 | struct of_genpd_provider *cp; | |
2191 | ||
2192 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2193 | if (!cp) | |
2194 | return -ENOMEM; | |
2195 | ||
2196 | cp->node = of_node_get(np); | |
2197 | cp->data = data; | |
2198 | cp->xlate = xlate; | |
2199 | ||
2200 | mutex_lock(&of_genpd_mutex); | |
2201 | list_add(&cp->link, &of_genpd_providers); | |
2202 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2203 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2204 | |
2205 | return 0; | |
2206 | } | |
892ebdcc | 2207 | |
fe0c2baa UH |
2208 | static bool genpd_present(const struct generic_pm_domain *genpd) |
2209 | { | |
2210 | const struct generic_pm_domain *gpd; | |
2211 | ||
2212 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
2213 | if (gpd == genpd) | |
2214 | return true; | |
2215 | return false; | |
2216 | } | |
2217 | ||
892ebdcc JH |
2218 | /** |
2219 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2220 | * @np: Device node pointer associated with the PM domain provider. | |
2221 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2222 | */ | |
2223 | int of_genpd_add_provider_simple(struct device_node *np, | |
2224 | struct generic_pm_domain *genpd) | |
2225 | { | |
0159ec67 JH |
2226 | int ret = -EINVAL; |
2227 | ||
2228 | if (!np || !genpd) | |
2229 | return -EINVAL; | |
2230 | ||
2231 | mutex_lock(&gpd_list_lock); | |
2232 | ||
6a0ae73d VK |
2233 | if (!genpd_present(genpd)) |
2234 | goto unlock; | |
2235 | ||
2236 | genpd->dev.of_node = np; | |
2237 | ||
2238 | /* Parse genpd OPP table */ | |
2239 | if (genpd->set_performance_state) { | |
2240 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
2241 | if (ret) { | |
dd461cd9 SG |
2242 | if (ret != -EPROBE_DEFER) |
2243 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
2244 | ret); | |
6a0ae73d | 2245 | goto unlock; |
8ce95844 | 2246 | } |
1067ae3e VK |
2247 | |
2248 | /* | |
2249 | * Save table for faster processing while setting performance | |
2250 | * state. | |
2251 | */ | |
2252 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
dd461cd9 | 2253 | WARN_ON(IS_ERR(genpd->opp_table)); |
de0aa06d JH |
2254 | } |
2255 | ||
6a0ae73d VK |
2256 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2257 | if (ret) { | |
1067ae3e VK |
2258 | if (genpd->set_performance_state) { |
2259 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2260 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2261 | } |
6a0ae73d VK |
2262 | |
2263 | goto unlock; | |
2264 | } | |
2265 | ||
2266 | genpd->provider = &np->fwnode; | |
2267 | genpd->has_provider = true; | |
2268 | ||
2269 | unlock: | |
0159ec67 JH |
2270 | mutex_unlock(&gpd_list_lock); |
2271 | ||
2272 | return ret; | |
892ebdcc JH |
2273 | } |
2274 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2275 | ||
2276 | /** | |
2277 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2278 | * @np: Device node pointer associated with the PM domain provider. | |
2279 | * @data: Pointer to the data associated with the PM domain provider. | |
2280 | */ | |
2281 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2282 | struct genpd_onecell_data *data) | |
2283 | { | |
6a0ae73d | 2284 | struct generic_pm_domain *genpd; |
0159ec67 | 2285 | unsigned int i; |
de0aa06d | 2286 | int ret = -EINVAL; |
0159ec67 JH |
2287 | |
2288 | if (!np || !data) | |
2289 | return -EINVAL; | |
2290 | ||
2291 | mutex_lock(&gpd_list_lock); | |
2292 | ||
40845524 TR |
2293 | if (!data->xlate) |
2294 | data->xlate = genpd_xlate_onecell; | |
2295 | ||
0159ec67 | 2296 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2297 | genpd = data->domains[i]; |
2298 | ||
2299 | if (!genpd) | |
609bed67 | 2300 | continue; |
6a0ae73d | 2301 | if (!genpd_present(genpd)) |
de0aa06d JH |
2302 | goto error; |
2303 | ||
6a0ae73d VK |
2304 | genpd->dev.of_node = np; |
2305 | ||
2306 | /* Parse genpd OPP table */ | |
2307 | if (genpd->set_performance_state) { | |
2308 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2309 | if (ret) { | |
dd461cd9 SG |
2310 | if (ret != -EPROBE_DEFER) |
2311 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2312 | i, ret); | |
6a0ae73d VK |
2313 | goto error; |
2314 | } | |
1067ae3e VK |
2315 | |
2316 | /* | |
2317 | * Save table for faster processing while setting | |
2318 | * performance state. | |
2319 | */ | |
e77dcb0b | 2320 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
dd461cd9 | 2321 | WARN_ON(IS_ERR(genpd->opp_table)); |
6a0ae73d VK |
2322 | } |
2323 | ||
2324 | genpd->provider = &np->fwnode; | |
2325 | genpd->has_provider = true; | |
0159ec67 JH |
2326 | } |
2327 | ||
40845524 | 2328 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2329 | if (ret < 0) |
2330 | goto error; | |
2331 | ||
2332 | mutex_unlock(&gpd_list_lock); | |
2333 | ||
2334 | return 0; | |
2335 | ||
2336 | error: | |
2337 | while (i--) { | |
6a0ae73d VK |
2338 | genpd = data->domains[i]; |
2339 | ||
2340 | if (!genpd) | |
609bed67 | 2341 | continue; |
6a0ae73d VK |
2342 | |
2343 | genpd->provider = NULL; | |
2344 | genpd->has_provider = false; | |
2345 | ||
1067ae3e VK |
2346 | if (genpd->set_performance_state) { |
2347 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2348 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2349 | } |
de0aa06d | 2350 | } |
0159ec67 JH |
2351 | |
2352 | mutex_unlock(&gpd_list_lock); | |
2353 | ||
2354 | return ret; | |
892ebdcc JH |
2355 | } |
2356 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2357 | |
2358 | /** | |
2359 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2360 | * @np: Device node pointer associated with the PM domain provider | |
2361 | */ | |
2362 | void of_genpd_del_provider(struct device_node *np) | |
2363 | { | |
b556b15d | 2364 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2365 | struct generic_pm_domain *gpd; |
aa42240a | 2366 | |
de0aa06d | 2367 | mutex_lock(&gpd_list_lock); |
aa42240a | 2368 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2369 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2370 | if (cp->node == np) { |
de0aa06d JH |
2371 | /* |
2372 | * For each PM domain associated with the | |
2373 | * provider, set the 'has_provider' to false | |
2374 | * so that the PM domain can be safely removed. | |
2375 | */ | |
6a0ae73d VK |
2376 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2377 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2378 | gpd->has_provider = false; |
2379 | ||
6a0ae73d VK |
2380 | if (!gpd->set_performance_state) |
2381 | continue; | |
2382 | ||
1067ae3e | 2383 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2384 | dev_pm_opp_of_remove_table(&gpd->dev); |
2385 | } | |
2386 | } | |
2387 | ||
aa42240a TF |
2388 | list_del(&cp->link); |
2389 | of_node_put(cp->node); | |
2390 | kfree(cp); | |
2391 | break; | |
2392 | } | |
2393 | } | |
2394 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2395 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2396 | } |
2397 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2398 | ||
2399 | /** | |
f58d4e5a | 2400 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2401 | * @genpdspec: OF phandle args to use for look-up |
2402 | * | |
2403 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2404 | * found, uses xlate function of the provider to map phandle args to a PM | |
2405 | * domain. | |
2406 | * | |
2407 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2408 | * on failure. | |
2409 | */ | |
f58d4e5a | 2410 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2411 | struct of_phandle_args *genpdspec) |
2412 | { | |
2413 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2414 | struct of_genpd_provider *provider; | |
2415 | ||
41795a8a JH |
2416 | if (!genpdspec) |
2417 | return ERR_PTR(-EINVAL); | |
2418 | ||
aa42240a TF |
2419 | mutex_lock(&of_genpd_mutex); |
2420 | ||
2421 | /* Check if we have such a provider in our array */ | |
2422 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2423 | if (provider->node == genpdspec->np) | |
2424 | genpd = provider->xlate(genpdspec, provider->data); | |
2425 | if (!IS_ERR(genpd)) | |
2426 | break; | |
2427 | } | |
2428 | ||
2429 | mutex_unlock(&of_genpd_mutex); | |
2430 | ||
2431 | return genpd; | |
2432 | } | |
2433 | ||
ec69572b JH |
2434 | /** |
2435 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2436 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2437 | * @dev: Device to be added. | |
2438 | * | |
2439 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2440 | * the device to the PM domain. Returns a negative error code on failure. | |
2441 | */ | |
2442 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2443 | { | |
2444 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2445 | int ret; |
2446 | ||
2447 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2448 | |
f58d4e5a | 2449 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2450 | if (IS_ERR(genpd)) { |
2451 | ret = PTR_ERR(genpd); | |
2452 | goto out; | |
2453 | } | |
2454 | ||
f9ccd7c3 | 2455 | ret = genpd_add_device(genpd, dev, dev); |
ec69572b | 2456 | |
19efa5ff JH |
2457 | out: |
2458 | mutex_unlock(&gpd_list_lock); | |
2459 | ||
2460 | return ret; | |
ec69572b JH |
2461 | } |
2462 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2463 | ||
2464 | /** | |
2465 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2466 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2467 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2468 | * | |
2469 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2470 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2471 | * negative error code on failure. | |
2472 | */ | |
2473 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2474 | struct of_phandle_args *subdomain_spec) | |
2475 | { | |
2476 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2477 | int ret; |
2478 | ||
2479 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2480 | |
f58d4e5a | 2481 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2482 | if (IS_ERR(parent)) { |
2483 | ret = PTR_ERR(parent); | |
2484 | goto out; | |
2485 | } | |
ec69572b | 2486 | |
f58d4e5a | 2487 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2488 | if (IS_ERR(subdomain)) { |
2489 | ret = PTR_ERR(subdomain); | |
2490 | goto out; | |
2491 | } | |
2492 | ||
2493 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2494 | |
19efa5ff JH |
2495 | out: |
2496 | mutex_unlock(&gpd_list_lock); | |
2497 | ||
18027d6f | 2498 | return ret == -ENOENT ? -EPROBE_DEFER : ret; |
ec69572b JH |
2499 | } |
2500 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2501 | ||
dedd1492 UH |
2502 | /** |
2503 | * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
2504 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2505 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2506 | * | |
2507 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2508 | * provided and removes the subdomain from the parent PM domain. Returns a | |
2509 | * negative error code on failure. | |
2510 | */ | |
2511 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, | |
2512 | struct of_phandle_args *subdomain_spec) | |
2513 | { | |
2514 | struct generic_pm_domain *parent, *subdomain; | |
2515 | int ret; | |
2516 | ||
2517 | mutex_lock(&gpd_list_lock); | |
2518 | ||
2519 | parent = genpd_get_from_provider(parent_spec); | |
2520 | if (IS_ERR(parent)) { | |
2521 | ret = PTR_ERR(parent); | |
2522 | goto out; | |
2523 | } | |
2524 | ||
2525 | subdomain = genpd_get_from_provider(subdomain_spec); | |
2526 | if (IS_ERR(subdomain)) { | |
2527 | ret = PTR_ERR(subdomain); | |
2528 | goto out; | |
2529 | } | |
2530 | ||
2531 | ret = pm_genpd_remove_subdomain(parent, subdomain); | |
2532 | ||
2533 | out: | |
2534 | mutex_unlock(&gpd_list_lock); | |
2535 | ||
2536 | return ret; | |
2537 | } | |
2538 | EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); | |
2539 | ||
17926551 JH |
2540 | /** |
2541 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2542 | * @provider: Pointer to device structure associated with provider | |
2543 | * | |
2544 | * Find the last PM domain that was added by a particular provider and | |
2545 | * remove this PM domain from the list of PM domains. The provider is | |
2546 | * identified by the 'provider' device structure that is passed. The PM | |
2547 | * domain will only be removed, if the provider associated with domain | |
2548 | * has been removed. | |
2549 | * | |
2550 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2551 | * ERR_PTR() on failure. | |
2552 | */ | |
2553 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2554 | { | |
a7e2d1bc | 2555 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2556 | int ret; |
2557 | ||
2558 | if (IS_ERR_OR_NULL(np)) | |
2559 | return ERR_PTR(-EINVAL); | |
2560 | ||
2561 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2562 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2563 | if (gpd->provider == &np->fwnode) { |
2564 | ret = genpd_remove(gpd); | |
2565 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2566 | break; | |
2567 | } | |
2568 | } | |
2569 | mutex_unlock(&gpd_list_lock); | |
2570 | ||
2571 | return genpd; | |
2572 | } | |
2573 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2574 | ||
3c095f32 UH |
2575 | static void genpd_release_dev(struct device *dev) |
2576 | { | |
e8b04de9 | 2577 | of_node_put(dev->of_node); |
3c095f32 UH |
2578 | kfree(dev); |
2579 | } | |
2580 | ||
2581 | static struct bus_type genpd_bus_type = { | |
2582 | .name = "genpd", | |
2583 | }; | |
2584 | ||
aa42240a TF |
2585 | /** |
2586 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2587 | * @dev: Device to detach. |
aa42240a TF |
2588 | * @power_off: Currently not used |
2589 | * | |
2590 | * Try to locate a corresponding generic PM domain, which the device was | |
2591 | * attached to previously. If such is found, the device is detached from it. | |
2592 | */ | |
2593 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2594 | { | |
446d999c | 2595 | struct generic_pm_domain *pd; |
93af5e93 | 2596 | unsigned int i; |
aa42240a TF |
2597 | int ret = 0; |
2598 | ||
85168d56 UH |
2599 | pd = dev_to_genpd(dev); |
2600 | if (IS_ERR(pd)) | |
aa42240a TF |
2601 | return; |
2602 | ||
2603 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2604 | ||
93af5e93 | 2605 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2606 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2607 | if (ret != -EAGAIN) |
2608 | break; | |
93af5e93 GU |
2609 | |
2610 | mdelay(i); | |
aa42240a TF |
2611 | cond_resched(); |
2612 | } | |
2613 | ||
2614 | if (ret < 0) { | |
2615 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2616 | pd->name, ret); | |
2617 | return; | |
2618 | } | |
2619 | ||
2620 | /* Check if PM domain can be powered off after removing this device. */ | |
2621 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2622 | |
2623 | /* Unregister the device if it was created by genpd. */ | |
2624 | if (dev->bus == &genpd_bus_type) | |
2625 | device_unregister(dev); | |
aa42240a TF |
2626 | } |
2627 | ||
632f7ce3 RK |
2628 | static void genpd_dev_pm_sync(struct device *dev) |
2629 | { | |
2630 | struct generic_pm_domain *pd; | |
2631 | ||
2632 | pd = dev_to_genpd(dev); | |
2633 | if (IS_ERR(pd)) | |
2634 | return; | |
2635 | ||
2636 | genpd_queue_power_off_work(pd); | |
2637 | } | |
2638 | ||
51dcf748 UH |
2639 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2640 | unsigned int index, bool power_on) | |
aa42240a TF |
2641 | { |
2642 | struct of_phandle_args pd_args; | |
2643 | struct generic_pm_domain *pd; | |
2644 | int ret; | |
2645 | ||
e8b04de9 | 2646 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2647 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2648 | if (ret < 0) |
bcd931f2 | 2649 | return ret; |
aa42240a | 2650 | |
19efa5ff | 2651 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2652 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2653 | of_node_put(pd_args.np); |
aa42240a | 2654 | if (IS_ERR(pd)) { |
19efa5ff | 2655 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2656 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2657 | __func__, PTR_ERR(pd)); | |
51dcf748 | 2658 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2659 | } |
2660 | ||
2661 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2662 | ||
f9ccd7c3 | 2663 | ret = genpd_add_device(pd, dev, base_dev); |
19efa5ff | 2664 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2665 | |
2666 | if (ret < 0) { | |
34994692 GU |
2667 | if (ret != -EPROBE_DEFER) |
2668 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2669 | pd->name, ret); | |
919b7308 | 2670 | return ret; |
aa42240a TF |
2671 | } |
2672 | ||
2673 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2674 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2675 | |
895b6612 UH |
2676 | if (power_on) { |
2677 | genpd_lock(pd); | |
2678 | ret = genpd_power_on(pd, 0); | |
2679 | genpd_unlock(pd); | |
2680 | } | |
72038df3 UH |
2681 | |
2682 | if (ret) | |
2683 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2684 | |
2685 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2686 | } |
8cb1cbd6 UH |
2687 | |
2688 | /** | |
2689 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2690 | * @dev: Device to attach. | |
2691 | * | |
2692 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2693 | * attaches the device to retrieved pm_domain ops. | |
2694 | * | |
2695 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2696 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2697 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2698 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2699 | * not probed and to re-try again later. | |
2700 | */ | |
2701 | int genpd_dev_pm_attach(struct device *dev) | |
2702 | { | |
2703 | if (!dev->of_node) | |
2704 | return 0; | |
2705 | ||
2706 | /* | |
2707 | * Devices with multiple PM domains must be attached separately, as we | |
2708 | * can only attach one PM domain per device. | |
2709 | */ | |
2710 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2711 | "#power-domain-cells") != 1) | |
2712 | return 0; | |
2713 | ||
51dcf748 | 2714 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2715 | } |
aa42240a | 2716 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2717 | |
3c095f32 UH |
2718 | /** |
2719 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2720 | * @dev: The device used to lookup the PM domain. | |
2721 | * @index: The index of the PM domain. | |
2722 | * | |
2723 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2724 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2725 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2726 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2727 | * | |
2728 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2729 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2730 | * failures. If a power-domain exists for the device, but cannot be found or | |
2731 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2732 | * is not probed and to re-try again later. | |
2733 | */ | |
2734 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2735 | unsigned int index) | |
2736 | { | |
560928b2 | 2737 | struct device *virt_dev; |
3c095f32 UH |
2738 | int num_domains; |
2739 | int ret; | |
2740 | ||
2741 | if (!dev->of_node) | |
2742 | return NULL; | |
2743 | ||
3ccf3f0c | 2744 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2745 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2746 | "#power-domain-cells"); | |
3ccf3f0c | 2747 | if (index >= num_domains) |
3c095f32 UH |
2748 | return NULL; |
2749 | ||
2750 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2751 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2752 | if (!virt_dev) | |
3c095f32 UH |
2753 | return ERR_PTR(-ENOMEM); |
2754 | ||
560928b2 VK |
2755 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2756 | virt_dev->bus = &genpd_bus_type; | |
2757 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2758 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2759 | |
560928b2 | 2760 | ret = device_register(virt_dev); |
3c095f32 | 2761 | if (ret) { |
71b77697 | 2762 | put_device(virt_dev); |
3c095f32 UH |
2763 | return ERR_PTR(ret); |
2764 | } | |
2765 | ||
2766 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2767 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2768 | if (ret < 1) { |
560928b2 | 2769 | device_unregister(virt_dev); |
3c095f32 UH |
2770 | return ret ? ERR_PTR(ret) : NULL; |
2771 | } | |
2772 | ||
560928b2 VK |
2773 | pm_runtime_enable(virt_dev); |
2774 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2775 | |
560928b2 | 2776 | return virt_dev; |
3c095f32 UH |
2777 | } |
2778 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2779 | ||
5d6be70a UH |
2780 | /** |
2781 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2782 | * @dev: The device used to lookup the PM domain. | |
2783 | * @name: The name of the PM domain. | |
2784 | * | |
2785 | * Parse device's OF node to find a PM domain specifier using the | |
2786 | * power-domain-names DT property. For further description see | |
2787 | * genpd_dev_pm_attach_by_id(). | |
2788 | */ | |
7416f1f2 | 2789 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2790 | { |
2791 | int index; | |
2792 | ||
2793 | if (!dev->of_node) | |
2794 | return NULL; | |
2795 | ||
2796 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2797 | name); | |
2798 | if (index < 0) | |
2799 | return NULL; | |
2800 | ||
2801 | return genpd_dev_pm_attach_by_id(dev, index); | |
2802 | } | |
2803 | ||
30f60428 | 2804 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2805 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2806 | { } |
2807 | }; | |
2808 | ||
2809 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2810 | struct device_node *state_node) | |
2811 | { | |
2812 | int err; | |
2813 | u32 residency; | |
2814 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2815 | |
2816 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2817 | &entry_latency); | |
2818 | if (err) { | |
ea11e94b | 2819 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2820 | state_node); |
30f60428 LI |
2821 | return -EINVAL; |
2822 | } | |
2823 | ||
2824 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2825 | &exit_latency); | |
2826 | if (err) { | |
ea11e94b | 2827 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2828 | state_node); |
30f60428 LI |
2829 | return -EINVAL; |
2830 | } | |
2831 | ||
2832 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2833 | if (!err) | |
2834 | genpd_state->residency_ns = 1000 * residency; | |
2835 | ||
2836 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2837 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2838 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2839 | |
2840 | return 0; | |
2841 | } | |
2842 | ||
a3381e3a UH |
2843 | static int genpd_iterate_idle_states(struct device_node *dn, |
2844 | struct genpd_power_state *states) | |
2845 | { | |
2846 | int ret; | |
2847 | struct of_phandle_iterator it; | |
2848 | struct device_node *np; | |
2849 | int i = 0; | |
2850 | ||
2851 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2852 | if (ret <= 0) | |
56cb2689 | 2853 | return ret == -ENOENT ? 0 : ret; |
a3381e3a UH |
2854 | |
2855 | /* Loop over the phandles until all the requested entry is found */ | |
2856 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2857 | np = it.node; | |
2858 | if (!of_match_node(idle_state_match, np)) | |
2859 | continue; | |
2860 | if (states) { | |
2861 | ret = genpd_parse_state(&states[i], np); | |
2862 | if (ret) { | |
2863 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2864 | np, ret); | |
2865 | of_node_put(np); | |
2866 | return ret; | |
2867 | } | |
2868 | } | |
2869 | i++; | |
2870 | } | |
2871 | ||
2872 | return i; | |
2873 | } | |
2874 | ||
30f60428 LI |
2875 | /** |
2876 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2877 | * | |
2878 | * @dn: The genpd device node | |
2879 | * @states: The pointer to which the state array will be saved. | |
2880 | * @n: The count of elements in the array returned from this function. | |
2881 | * | |
2882 | * Returns the device states parsed from the OF node. The memory for the states | |
2883 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2884 | * free the memory after use. If any or zero compatible domain idle states is |
2885 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2886 | */ |
2887 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2888 | struct genpd_power_state **states, int *n) | |
2889 | { | |
2890 | struct genpd_power_state *st; | |
a3381e3a | 2891 | int ret; |
30f60428 | 2892 | |
a3381e3a | 2893 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2894 | if (ret < 0) |
2895 | return ret; | |
2896 | ||
2897 | if (!ret) { | |
2898 | *states = NULL; | |
2899 | *n = 0; | |
2900 | return 0; | |
2901 | } | |
30f60428 | 2902 | |
a3381e3a | 2903 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2904 | if (!st) |
2905 | return -ENOMEM; | |
2906 | ||
a3381e3a UH |
2907 | ret = genpd_iterate_idle_states(dn, st); |
2908 | if (ret <= 0) { | |
2909 | kfree(st); | |
2910 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2911 | } |
2912 | ||
a3381e3a UH |
2913 | *states = st; |
2914 | *n = ret; | |
30f60428 LI |
2915 | |
2916 | return 0; | |
2917 | } | |
2918 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2919 | ||
e38f89d3 VK |
2920 | /** |
2921 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2922 | * | |
2923 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2924 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2925 | * state. | |
2926 | * | |
2927 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2928 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2929 | * power domain OPP to performance state. | |
2930 | * | |
2931 | * Returns performance state on success and 0 on failure. | |
2932 | */ | |
2933 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2934 | struct dev_pm_opp *opp) | |
2935 | { | |
2936 | struct generic_pm_domain *genpd = NULL; | |
2937 | int state; | |
2938 | ||
2939 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2940 | ||
2941 | if (unlikely(!genpd->opp_to_performance_state)) | |
2942 | return 0; | |
2943 | ||
2944 | genpd_lock(genpd); | |
2945 | state = genpd->opp_to_performance_state(genpd, opp); | |
2946 | genpd_unlock(genpd); | |
2947 | ||
2948 | return state; | |
2949 | } | |
2950 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2951 | ||
3c095f32 UH |
2952 | static int __init genpd_bus_init(void) |
2953 | { | |
2954 | return bus_register(&genpd_bus_type); | |
2955 | } | |
2956 | core_initcall(genpd_bus_init); | |
2957 | ||
d30d819d | 2958 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2959 | |
2960 | ||
2961 | /*** debugfs support ***/ | |
2962 | ||
8b0510b5 | 2963 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2964 | /* |
2965 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2966 | * from sysfs.c, so generalize it. |
2bd5306a | 2967 | */ |
2bd5306a MM |
2968 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2969 | { | |
2970 | static const char * const status_lookup[] = { | |
2971 | [RPM_ACTIVE] = "active", | |
2972 | [RPM_RESUMING] = "resuming", | |
2973 | [RPM_SUSPENDED] = "suspended", | |
2974 | [RPM_SUSPENDING] = "suspending" | |
2975 | }; | |
2976 | const char *p = ""; | |
2977 | ||
2978 | if (dev->power.runtime_error) | |
2979 | p = "error"; | |
2980 | else if (dev->power.disable_depth) | |
2981 | p = "unsupported"; | |
2982 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2983 | p = status_lookup[dev->power.runtime_status]; | |
2984 | else | |
2985 | WARN_ON(1); | |
2986 | ||
45fbc464 DO |
2987 | seq_printf(s, "%-25s ", p); |
2988 | } | |
2989 | ||
2990 | static void perf_status_str(struct seq_file *s, struct device *dev) | |
2991 | { | |
2992 | struct generic_pm_domain_data *gpd_data; | |
2993 | ||
2994 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
2995 | seq_put_decimal_ull(s, "", gpd_data->performance_state); | |
2bd5306a | 2996 | } |
2bd5306a | 2997 | |
9e9704ea UH |
2998 | static int genpd_summary_one(struct seq_file *s, |
2999 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
3000 | { |
3001 | static const char * const status_lookup[] = { | |
49f618e1 UH |
3002 | [GENPD_STATE_ON] = "on", |
3003 | [GENPD_STATE_OFF] = "off" | |
2bd5306a MM |
3004 | }; |
3005 | struct pm_domain_data *pm_data; | |
3006 | const char *kobj_path; | |
3007 | struct gpd_link *link; | |
6954d432 | 3008 | char state[16]; |
2bd5306a MM |
3009 | int ret; |
3010 | ||
35241d12 | 3011 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
3012 | if (ret) |
3013 | return -ERESTARTSYS; | |
3014 | ||
66a5ca4b | 3015 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 3016 | goto exit; |
41e2c8e0 | 3017 | if (!genpd_status_on(genpd)) |
0ba554e4 | 3018 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 3019 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 3020 | else |
6954d432 GU |
3021 | snprintf(state, sizeof(state), "%s", |
3022 | status_lookup[genpd->status]); | |
45fbc464 | 3023 | seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state); |
2bd5306a MM |
3024 | |
3025 | /* | |
3026 | * Modifications on the list require holding locks on both | |
8d87ae48 | 3027 | * parent and child, so we are safe. |
66a5ca4b | 3028 | * Also genpd->name is immutable. |
2bd5306a | 3029 | */ |
8d87ae48 | 3030 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
45fbc464 DO |
3031 | if (list_is_first(&link->parent_node, &genpd->parent_links)) |
3032 | seq_printf(s, "\n%48s", " "); | |
8d87ae48 KC |
3033 | seq_printf(s, "%s", link->child->name); |
3034 | if (!list_is_last(&link->parent_node, &genpd->parent_links)) | |
2bd5306a MM |
3035 | seq_puts(s, ", "); |
3036 | } | |
3037 | ||
66a5ca4b | 3038 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
3039 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
3040 | genpd_is_irq_safe(genpd) ? | |
3041 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
3042 | if (kobj_path == NULL) |
3043 | continue; | |
3044 | ||
3045 | seq_printf(s, "\n %-50s ", kobj_path); | |
3046 | rtpm_status_str(s, pm_data->dev); | |
45fbc464 | 3047 | perf_status_str(s, pm_data->dev); |
2bd5306a MM |
3048 | kfree(kobj_path); |
3049 | } | |
3050 | ||
3051 | seq_puts(s, "\n"); | |
3052 | exit: | |
35241d12 | 3053 | genpd_unlock(genpd); |
2bd5306a MM |
3054 | |
3055 | return 0; | |
3056 | } | |
3057 | ||
d32dcc6c | 3058 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 3059 | { |
66a5ca4b | 3060 | struct generic_pm_domain *genpd; |
2bd5306a MM |
3061 | int ret = 0; |
3062 | ||
45fbc464 | 3063 | seq_puts(s, "domain status children performance\n"); |
15dec67a | 3064 | seq_puts(s, " /device runtime status\n"); |
45fbc464 | 3065 | seq_puts(s, "----------------------------------------------------------------------------------------------\n"); |
2bd5306a MM |
3066 | |
3067 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
3068 | if (ret) | |
3069 | return -ERESTARTSYS; | |
3070 | ||
66a5ca4b | 3071 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3072 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
3073 | if (ret) |
3074 | break; | |
3075 | } | |
3076 | mutex_unlock(&gpd_list_lock); | |
3077 | ||
3078 | return ret; | |
3079 | } | |
3080 | ||
d32dcc6c | 3081 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 3082 | { |
b6a1d093 | 3083 | static const char * const status_lookup[] = { |
49f618e1 UH |
3084 | [GENPD_STATE_ON] = "on", |
3085 | [GENPD_STATE_OFF] = "off" | |
b6a1d093 TG |
3086 | }; |
3087 | ||
3088 | struct generic_pm_domain *genpd = s->private; | |
3089 | int ret = 0; | |
3090 | ||
3091 | ret = genpd_lock_interruptible(genpd); | |
3092 | if (ret) | |
3093 | return -ERESTARTSYS; | |
3094 | ||
3095 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
3096 | goto exit; | |
3097 | ||
49f618e1 | 3098 | if (genpd->status == GENPD_STATE_OFF) |
b6a1d093 TG |
3099 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
3100 | genpd->state_idx); | |
3101 | else | |
3102 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
3103 | exit: | |
3104 | genpd_unlock(genpd); | |
3105 | return ret; | |
2bd5306a MM |
3106 | } |
3107 | ||
d32dcc6c | 3108 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3109 | { |
3110 | struct generic_pm_domain *genpd = s->private; | |
3111 | struct gpd_link *link; | |
3112 | int ret = 0; | |
3113 | ||
3114 | ret = genpd_lock_interruptible(genpd); | |
3115 | if (ret) | |
3116 | return -ERESTARTSYS; | |
3117 | ||
8d87ae48 KC |
3118 | list_for_each_entry(link, &genpd->parent_links, parent_node) |
3119 | seq_printf(s, "%s\n", link->child->name); | |
b6a1d093 TG |
3120 | |
3121 | genpd_unlock(genpd); | |
3122 | return ret; | |
3123 | } | |
3124 | ||
d32dcc6c | 3125 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3126 | { |
3127 | struct generic_pm_domain *genpd = s->private; | |
3128 | unsigned int i; | |
3129 | int ret = 0; | |
3130 | ||
3131 | ret = genpd_lock_interruptible(genpd); | |
3132 | if (ret) | |
3133 | return -ERESTARTSYS; | |
3134 | ||
c6a113b5 | 3135 | seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
b6a1d093 TG |
3136 | |
3137 | for (i = 0; i < genpd->state_count; i++) { | |
3138 | ktime_t delta = 0; | |
3139 | s64 msecs; | |
3140 | ||
49f618e1 | 3141 | if ((genpd->status == GENPD_STATE_OFF) && |
b6a1d093 TG |
3142 | (genpd->state_idx == i)) |
3143 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
3144 | ||
3145 | msecs = ktime_to_ms( | |
3146 | ktime_add(genpd->states[i].idle_time, delta)); | |
c6a113b5 LI |
3147 | seq_printf(s, "S%-13i %-14lld %-14llu %llu\n", i, msecs, |
3148 | genpd->states[i].usage, genpd->states[i].rejected); | |
b6a1d093 TG |
3149 | } |
3150 | ||
3151 | genpd_unlock(genpd); | |
3152 | return ret; | |
3153 | } | |
3154 | ||
d32dcc6c | 3155 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3156 | { |
3157 | struct generic_pm_domain *genpd = s->private; | |
3158 | ktime_t delta = 0; | |
3159 | int ret = 0; | |
3160 | ||
3161 | ret = genpd_lock_interruptible(genpd); | |
3162 | if (ret) | |
3163 | return -ERESTARTSYS; | |
3164 | ||
49f618e1 | 3165 | if (genpd->status == GENPD_STATE_ON) |
b6a1d093 TG |
3166 | delta = ktime_sub(ktime_get(), genpd->accounting_time); |
3167 | ||
3168 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
3169 | ktime_add(genpd->on_time, delta))); | |
3170 | ||
3171 | genpd_unlock(genpd); | |
3172 | return ret; | |
3173 | } | |
3174 | ||
d32dcc6c | 3175 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3176 | { |
3177 | struct generic_pm_domain *genpd = s->private; | |
3178 | ktime_t delta = 0, total = 0; | |
3179 | unsigned int i; | |
3180 | int ret = 0; | |
3181 | ||
3182 | ret = genpd_lock_interruptible(genpd); | |
3183 | if (ret) | |
3184 | return -ERESTARTSYS; | |
3185 | ||
3186 | for (i = 0; i < genpd->state_count; i++) { | |
3187 | ||
49f618e1 | 3188 | if ((genpd->status == GENPD_STATE_OFF) && |
b6a1d093 TG |
3189 | (genpd->state_idx == i)) |
3190 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
3191 | ||
3192 | total = ktime_add(total, genpd->states[i].idle_time); | |
3193 | } | |
3194 | total = ktime_add(total, delta); | |
3195 | ||
3196 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
3197 | ||
3198 | genpd_unlock(genpd); | |
3199 | return ret; | |
3200 | } | |
3201 | ||
3202 | ||
d32dcc6c | 3203 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3204 | { |
3205 | struct generic_pm_domain *genpd = s->private; | |
3206 | struct pm_domain_data *pm_data; | |
3207 | const char *kobj_path; | |
3208 | int ret = 0; | |
3209 | ||
3210 | ret = genpd_lock_interruptible(genpd); | |
3211 | if (ret) | |
3212 | return -ERESTARTSYS; | |
3213 | ||
3214 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
3215 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
3216 | genpd_is_irq_safe(genpd) ? | |
3217 | GFP_ATOMIC : GFP_KERNEL); | |
3218 | if (kobj_path == NULL) | |
3219 | continue; | |
3220 | ||
3221 | seq_printf(s, "%s\n", kobj_path); | |
3222 | kfree(kobj_path); | |
3223 | } | |
3224 | ||
3225 | genpd_unlock(genpd); | |
3226 | return ret; | |
3227 | } | |
3228 | ||
d32dcc6c | 3229 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
3230 | { |
3231 | struct generic_pm_domain *genpd = s->private; | |
3232 | ||
3233 | if (genpd_lock_interruptible(genpd)) | |
3234 | return -ERESTARTSYS; | |
3235 | ||
3236 | seq_printf(s, "%u\n", genpd->performance_state); | |
3237 | ||
3238 | genpd_unlock(genpd); | |
3239 | return 0; | |
3240 | } | |
3241 | ||
d32dcc6c YL |
3242 | DEFINE_SHOW_ATTRIBUTE(summary); |
3243 | DEFINE_SHOW_ATTRIBUTE(status); | |
3244 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3245 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3246 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3247 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3248 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3249 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3250 | |
718072ce | 3251 | static void genpd_debug_add(struct generic_pm_domain *genpd) |
2bd5306a MM |
3252 | { |
3253 | struct dentry *d; | |
718072ce TS |
3254 | |
3255 | if (!genpd_debugfs_dir) | |
3256 | return; | |
3257 | ||
3258 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); | |
3259 | ||
3260 | debugfs_create_file("current_state", 0444, | |
3261 | d, genpd, &status_fops); | |
3262 | debugfs_create_file("sub_domains", 0444, | |
3263 | d, genpd, &sub_domains_fops); | |
3264 | debugfs_create_file("idle_states", 0444, | |
3265 | d, genpd, &idle_states_fops); | |
3266 | debugfs_create_file("active_time", 0444, | |
3267 | d, genpd, &active_time_fops); | |
3268 | debugfs_create_file("total_idle_time", 0444, | |
3269 | d, genpd, &total_idle_time_fops); | |
3270 | debugfs_create_file("devices", 0444, | |
3271 | d, genpd, &devices_fops); | |
3272 | if (genpd->set_performance_state) | |
3273 | debugfs_create_file("perf_state", 0444, | |
3274 | d, genpd, &perf_state_fops); | |
3275 | } | |
3276 | ||
3277 | static int __init genpd_debug_init(void) | |
3278 | { | |
b6a1d093 | 3279 | struct generic_pm_domain *genpd; |
2bd5306a | 3280 | |
9e9704ea | 3281 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3282 | |
e16a42c3 GKH |
3283 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3284 | NULL, &summary_fops); | |
2bd5306a | 3285 | |
718072ce TS |
3286 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
3287 | genpd_debug_add(genpd); | |
b6a1d093 | 3288 | |
2bd5306a MM |
3289 | return 0; |
3290 | } | |
9e9704ea | 3291 | late_initcall(genpd_debug_init); |
2bd5306a | 3292 | |
9e9704ea | 3293 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3294 | { |
9e9704ea | 3295 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3296 | } |
9e9704ea | 3297 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3298 | #endif /* CONFIG_DEBUG_FS */ |