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> |
d5e4cbfe | 24 | |
aa8e54b5 TV |
25 | #include "power.h" |
26 | ||
93af5e93 GU |
27 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
28 | ||
d5e4cbfe RW |
29 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
30 | ({ \ | |
31 | type (*__routine)(struct device *__d); \ | |
32 | type __ret = (type)0; \ | |
33 | \ | |
34 | __routine = genpd->dev_ops.callback; \ | |
35 | if (__routine) { \ | |
36 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
37 | } \ |
38 | __ret; \ | |
39 | }) | |
f721889f | 40 | |
5125bbf3 RW |
41 | static LIST_HEAD(gpd_list); |
42 | static DEFINE_MUTEX(gpd_list_lock); | |
43 | ||
35241d12 LI |
44 | struct genpd_lock_ops { |
45 | void (*lock)(struct generic_pm_domain *genpd); | |
46 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
47 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
48 | void (*unlock)(struct generic_pm_domain *genpd); | |
49 | }; | |
50 | ||
51 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
52 | { | |
53 | mutex_lock(&genpd->mlock); | |
54 | } | |
55 | ||
56 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
57 | int depth) | |
58 | { | |
59 | mutex_lock_nested(&genpd->mlock, depth); | |
60 | } | |
61 | ||
62 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
63 | { | |
64 | return mutex_lock_interruptible(&genpd->mlock); | |
65 | } | |
66 | ||
67 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
68 | { | |
69 | return mutex_unlock(&genpd->mlock); | |
70 | } | |
71 | ||
72 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
73 | .lock = genpd_lock_mtx, | |
74 | .lock_nested = genpd_lock_nested_mtx, | |
75 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
76 | .unlock = genpd_unlock_mtx, | |
77 | }; | |
78 | ||
d716f479 LI |
79 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
80 | __acquires(&genpd->slock) | |
81 | { | |
82 | unsigned long flags; | |
83 | ||
84 | spin_lock_irqsave(&genpd->slock, flags); | |
85 | genpd->lock_flags = flags; | |
86 | } | |
87 | ||
88 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
89 | int depth) | |
90 | __acquires(&genpd->slock) | |
91 | { | |
92 | unsigned long flags; | |
93 | ||
94 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
95 | genpd->lock_flags = flags; | |
96 | } | |
97 | ||
98 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
99 | __acquires(&genpd->slock) | |
100 | { | |
101 | unsigned long flags; | |
102 | ||
103 | spin_lock_irqsave(&genpd->slock, flags); | |
104 | genpd->lock_flags = flags; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
109 | __releases(&genpd->slock) | |
110 | { | |
111 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
112 | } | |
113 | ||
114 | static const struct genpd_lock_ops genpd_spin_ops = { | |
115 | .lock = genpd_lock_spin, | |
116 | .lock_nested = genpd_lock_nested_spin, | |
117 | .lock_interruptible = genpd_lock_interruptible_spin, | |
118 | .unlock = genpd_unlock_spin, | |
119 | }; | |
120 | ||
35241d12 LI |
121 | #define genpd_lock(p) p->lock_ops->lock(p) |
122 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
123 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
124 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
125 | ||
49f618e1 | 126 | #define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) |
d716f479 | 127 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 128 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 129 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
eb594b73 | 130 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
ed61e18a | 131 | #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
d716f479 LI |
132 | |
133 | static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev, | |
d8600c8b | 134 | const struct generic_pm_domain *genpd) |
d716f479 LI |
135 | { |
136 | bool ret; | |
137 | ||
138 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); | |
139 | ||
075c37d5 UH |
140 | /* |
141 | * Warn once if an IRQ safe device is attached to a no sleep domain, as | |
142 | * to indicate a suboptimal configuration for PM. For an always on | |
143 | * domain this isn't case, thus don't warn. | |
144 | */ | |
145 | if (ret && !genpd_is_always_on(genpd)) | |
d716f479 LI |
146 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
147 | genpd->name); | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
b3ad17c0 UH |
152 | static int genpd_runtime_suspend(struct device *dev); |
153 | ||
446d999c RK |
154 | /* |
155 | * Get the generic PM domain for a particular struct device. | |
156 | * This validates the struct device pointer, the PM domain pointer, | |
157 | * and checks that the PM domain pointer is a real generic PM domain. | |
158 | * Any failure results in NULL being returned. | |
159 | */ | |
b3ad17c0 | 160 | static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
446d999c | 161 | { |
446d999c RK |
162 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
163 | return NULL; | |
164 | ||
b3ad17c0 UH |
165 | /* A genpd's always have its ->runtime_suspend() callback assigned. */ |
166 | if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) | |
167 | return pd_to_genpd(dev->pm_domain); | |
446d999c | 168 | |
b3ad17c0 | 169 | return NULL; |
446d999c RK |
170 | } |
171 | ||
172 | /* | |
173 | * This should only be used where we are certain that the pm_domain | |
174 | * attached to the device is a genpd domain. | |
175 | */ | |
176 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
177 | { |
178 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
179 | return ERR_PTR(-EINVAL); | |
180 | ||
596ba34b | 181 | return pd_to_genpd(dev->pm_domain); |
5248051b | 182 | } |
f721889f | 183 | |
d8600c8b KK |
184 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
185 | struct device *dev) | |
d5e4cbfe | 186 | { |
2b1d88cd | 187 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
188 | } |
189 | ||
d8600c8b KK |
190 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
191 | struct device *dev) | |
d5e4cbfe | 192 | { |
2b1d88cd | 193 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
194 | } |
195 | ||
c4bb3160 | 196 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 197 | { |
c4bb3160 RW |
198 | bool ret = false; |
199 | ||
200 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
201 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
202 | ||
203 | return ret; | |
204 | } | |
205 | ||
206 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
207 | { | |
208 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 209 | smp_mb__after_atomic(); |
f721889f RW |
210 | } |
211 | ||
afece3ab TG |
212 | #ifdef CONFIG_DEBUG_FS |
213 | static void genpd_update_accounting(struct generic_pm_domain *genpd) | |
214 | { | |
215 | ktime_t delta, now; | |
216 | ||
217 | now = ktime_get(); | |
218 | delta = ktime_sub(now, genpd->accounting_time); | |
219 | ||
220 | /* | |
221 | * If genpd->status is active, it means we are just | |
222 | * out of off and so update the idle time and vice | |
223 | * versa. | |
224 | */ | |
49f618e1 | 225 | if (genpd->status == GENPD_STATE_ON) { |
afece3ab TG |
226 | int state_idx = genpd->state_idx; |
227 | ||
228 | genpd->states[state_idx].idle_time = | |
229 | ktime_add(genpd->states[state_idx].idle_time, delta); | |
230 | } else { | |
231 | genpd->on_time = ktime_add(genpd->on_time, delta); | |
232 | } | |
233 | ||
234 | genpd->accounting_time = now; | |
235 | } | |
236 | #else | |
237 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} | |
238 | #endif | |
239 | ||
cd50c6d3 VK |
240 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
241 | unsigned int state) | |
242 | { | |
243 | struct generic_pm_domain_data *pd_data; | |
244 | struct pm_domain_data *pdd; | |
18edf49c | 245 | struct gpd_link *link; |
cd50c6d3 VK |
246 | |
247 | /* New requested state is same as Max requested state */ | |
248 | if (state == genpd->performance_state) | |
249 | return state; | |
250 | ||
251 | /* New requested state is higher than Max requested state */ | |
252 | if (state > genpd->performance_state) | |
253 | return state; | |
254 | ||
255 | /* Traverse all devices within the domain */ | |
256 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
257 | pd_data = to_gpd_data(pdd); | |
258 | ||
259 | if (pd_data->performance_state > state) | |
260 | state = pd_data->performance_state; | |
261 | } | |
262 | ||
263 | /* | |
18edf49c VK |
264 | * Traverse all sub-domains within the domain. This can be |
265 | * done without any additional locking as the link->performance_state | |
8d87ae48 | 266 | * field is protected by the parent genpd->lock, which is already taken. |
18edf49c VK |
267 | * |
268 | * Also note that link->performance_state (subdomain's performance state | |
8d87ae48 KC |
269 | * requirement to parent domain) is different from |
270 | * link->child->performance_state (current performance state requirement | |
18edf49c VK |
271 | * of the devices/sub-domains of the subdomain) and so can have a |
272 | * different value. | |
273 | * | |
274 | * Note that we also take vote from powered-off sub-domains into account | |
275 | * as the same is done for devices right now. | |
cd50c6d3 | 276 | */ |
8d87ae48 | 277 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
18edf49c VK |
278 | if (link->performance_state > state) |
279 | state = link->performance_state; | |
280 | } | |
281 | ||
cd50c6d3 VK |
282 | return state; |
283 | } | |
284 | ||
285 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, | |
18edf49c | 286 | unsigned int state, int depth) |
cd50c6d3 | 287 | { |
8d87ae48 | 288 | struct generic_pm_domain *parent; |
18edf49c | 289 | struct gpd_link *link; |
8d87ae48 | 290 | int parent_state, ret; |
cd50c6d3 VK |
291 | |
292 | if (state == genpd->performance_state) | |
293 | return 0; | |
294 | ||
8d87ae48 KC |
295 | /* Propagate to parents of genpd */ |
296 | list_for_each_entry(link, &genpd->child_links, child_node) { | |
297 | parent = link->parent; | |
18edf49c | 298 | |
8d87ae48 | 299 | if (!parent->set_performance_state) |
18edf49c VK |
300 | continue; |
301 | ||
8d87ae48 | 302 | /* Find parent's performance state */ |
18edf49c | 303 | ret = dev_pm_opp_xlate_performance_state(genpd->opp_table, |
8d87ae48 | 304 | parent->opp_table, |
18edf49c VK |
305 | state); |
306 | if (unlikely(ret < 0)) | |
307 | goto err; | |
308 | ||
8d87ae48 | 309 | parent_state = ret; |
18edf49c | 310 | |
8d87ae48 | 311 | genpd_lock_nested(parent, depth + 1); |
18edf49c VK |
312 | |
313 | link->prev_performance_state = link->performance_state; | |
8d87ae48 KC |
314 | link->performance_state = parent_state; |
315 | parent_state = _genpd_reeval_performance_state(parent, | |
316 | parent_state); | |
317 | ret = _genpd_set_performance_state(parent, parent_state, depth + 1); | |
18edf49c VK |
318 | if (ret) |
319 | link->performance_state = link->prev_performance_state; | |
320 | ||
8d87ae48 | 321 | genpd_unlock(parent); |
18edf49c VK |
322 | |
323 | if (ret) | |
324 | goto err; | |
325 | } | |
326 | ||
cd50c6d3 VK |
327 | ret = genpd->set_performance_state(genpd, state); |
328 | if (ret) | |
18edf49c | 329 | goto err; |
cd50c6d3 VK |
330 | |
331 | genpd->performance_state = state; | |
332 | return 0; | |
18edf49c VK |
333 | |
334 | err: | |
335 | /* Encountered an error, lets rollback */ | |
8d87ae48 KC |
336 | list_for_each_entry_continue_reverse(link, &genpd->child_links, |
337 | child_node) { | |
338 | parent = link->parent; | |
18edf49c | 339 | |
8d87ae48 | 340 | if (!parent->set_performance_state) |
18edf49c VK |
341 | continue; |
342 | ||
8d87ae48 | 343 | genpd_lock_nested(parent, depth + 1); |
18edf49c | 344 | |
8d87ae48 KC |
345 | parent_state = link->prev_performance_state; |
346 | link->performance_state = parent_state; | |
18edf49c | 347 | |
8d87ae48 KC |
348 | parent_state = _genpd_reeval_performance_state(parent, |
349 | parent_state); | |
350 | if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { | |
18edf49c | 351 | pr_err("%s: Failed to roll back to %d performance state\n", |
8d87ae48 | 352 | parent->name, parent_state); |
18edf49c VK |
353 | } |
354 | ||
8d87ae48 | 355 | genpd_unlock(parent); |
18edf49c VK |
356 | } |
357 | ||
358 | return ret; | |
cd50c6d3 VK |
359 | } |
360 | ||
42f6284a VK |
361 | /** |
362 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
363 | * domain. | |
364 | * | |
365 | * @dev: Device for which the performance-state needs to be set. | |
366 | * @state: Target performance state of the device. This can be set as 0 when the | |
367 | * device doesn't have any performance state constraints left (And so | |
368 | * the device wouldn't participate anymore to find the target | |
369 | * performance state of the genpd). | |
370 | * | |
371 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
372 | * while this routine is getting called. | |
373 | * | |
374 | * Returns 0 on success and negative error values on failures. | |
375 | */ | |
376 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
377 | { | |
378 | struct generic_pm_domain *genpd; | |
cd50c6d3 | 379 | struct generic_pm_domain_data *gpd_data; |
42f6284a | 380 | unsigned int prev; |
cd50c6d3 | 381 | int ret; |
42f6284a | 382 | |
3ea4ca92 UH |
383 | genpd = dev_to_genpd_safe(dev); |
384 | if (!genpd) | |
42f6284a VK |
385 | return -ENODEV; |
386 | ||
387 | if (unlikely(!genpd->set_performance_state)) | |
388 | return -EINVAL; | |
389 | ||
e757e7fa YL |
390 | if (WARN_ON(!dev->power.subsys_data || |
391 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 392 | return -EINVAL; |
42f6284a VK |
393 | |
394 | genpd_lock(genpd); | |
395 | ||
396 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
397 | prev = gpd_data->performance_state; | |
398 | gpd_data->performance_state = state; | |
399 | ||
cd50c6d3 | 400 | state = _genpd_reeval_performance_state(genpd, state); |
18edf49c | 401 | ret = _genpd_set_performance_state(genpd, state, 0); |
cd50c6d3 | 402 | if (ret) |
68de2fe5 | 403 | gpd_data->performance_state = prev; |
42f6284a | 404 | |
42f6284a VK |
405 | genpd_unlock(genpd); |
406 | ||
407 | return ret; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
410 | ||
86e12eac | 411 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 412 | { |
fc5cbf0c | 413 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
414 | ktime_t time_start; |
415 | s64 elapsed_ns; | |
d4f81383 UH |
416 | int ret, nr_calls = 0; |
417 | ||
418 | /* Notify consumers that we are about to power on. */ | |
419 | ret = __raw_notifier_call_chain(&genpd->power_notifiers, | |
420 | GENPD_NOTIFY_PRE_ON, NULL, -1, | |
421 | &nr_calls); | |
422 | ret = notifier_to_errno(ret); | |
423 | if (ret) | |
424 | goto err; | |
c8f0ea45 GU |
425 | |
426 | if (!genpd->power_on) | |
d4f81383 | 427 | goto out; |
c8f0ea45 | 428 | |
d4f81383 UH |
429 | if (!timed) { |
430 | ret = genpd->power_on(genpd); | |
431 | if (ret) | |
432 | goto err; | |
433 | ||
434 | goto out; | |
435 | } | |
a4630c61 | 436 | |
c8f0ea45 GU |
437 | time_start = ktime_get(); |
438 | ret = genpd->power_on(genpd); | |
439 | if (ret) | |
d4f81383 | 440 | goto err; |
c8f0ea45 GU |
441 | |
442 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 443 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
d4f81383 | 444 | goto out; |
c8f0ea45 | 445 | |
fc5cbf0c | 446 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
c8f0ea45 | 447 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
448 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
449 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 | 450 | |
d4f81383 UH |
451 | out: |
452 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); | |
453 | return 0; | |
454 | err: | |
455 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
456 | NULL); | |
c8f0ea45 GU |
457 | return ret; |
458 | } | |
459 | ||
86e12eac | 460 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 461 | { |
fc5cbf0c | 462 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
463 | ktime_t time_start; |
464 | s64 elapsed_ns; | |
d4f81383 UH |
465 | int ret, nr_calls = 0; |
466 | ||
467 | /* Notify consumers that we are about to power off. */ | |
468 | ret = __raw_notifier_call_chain(&genpd->power_notifiers, | |
469 | GENPD_NOTIFY_PRE_OFF, NULL, -1, | |
470 | &nr_calls); | |
471 | ret = notifier_to_errno(ret); | |
472 | if (ret) | |
473 | goto busy; | |
c8f0ea45 GU |
474 | |
475 | if (!genpd->power_off) | |
d4f81383 UH |
476 | goto out; |
477 | ||
478 | if (!timed) { | |
479 | ret = genpd->power_off(genpd); | |
480 | if (ret) | |
481 | goto busy; | |
c8f0ea45 | 482 | |
d4f81383 UH |
483 | goto out; |
484 | } | |
a4630c61 | 485 | |
c8f0ea45 GU |
486 | time_start = ktime_get(); |
487 | ret = genpd->power_off(genpd); | |
0cec68a9 | 488 | if (ret) |
d4f81383 | 489 | goto busy; |
c8f0ea45 GU |
490 | |
491 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 492 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
d4f81383 | 493 | goto out; |
c8f0ea45 | 494 | |
fc5cbf0c | 495 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
c8f0ea45 | 496 | genpd->max_off_time_changed = true; |
6d7d5c32 RK |
497 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
498 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 499 | |
d4f81383 UH |
500 | out: |
501 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
502 | NULL); | |
0cec68a9 | 503 | return 0; |
d4f81383 UH |
504 | busy: |
505 | if (nr_calls) | |
506 | __raw_notifier_call_chain(&genpd->power_notifiers, | |
507 | GENPD_NOTIFY_ON, NULL, nr_calls - 1, | |
508 | NULL); | |
509 | return ret; | |
c8f0ea45 GU |
510 | } |
511 | ||
29e47e21 | 512 | /** |
86e12eac | 513 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 514 | * @genpd: PM domain to power off. |
29e47e21 | 515 | * |
86e12eac | 516 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
517 | * before. |
518 | */ | |
519 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
520 | { | |
521 | queue_work(pm_wq, &genpd->power_off_work); | |
522 | } | |
523 | ||
1f8728b7 UH |
524 | /** |
525 | * genpd_power_off - Remove power from a given PM domain. | |
526 | * @genpd: PM domain to power down. | |
3c64649d UH |
527 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
528 | * RPM status of the releated device is in an intermediate state, not yet turned | |
529 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
530 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
1f8728b7 UH |
531 | * |
532 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
533 | * have been powered down, remove power from @genpd. | |
534 | */ | |
2da83545 UH |
535 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
536 | unsigned int depth) | |
1f8728b7 UH |
537 | { |
538 | struct pm_domain_data *pdd; | |
539 | struct gpd_link *link; | |
540 | unsigned int not_suspended = 0; | |
f63816e4 | 541 | int ret; |
1f8728b7 UH |
542 | |
543 | /* | |
544 | * Do not try to power off the domain in the following situations: | |
545 | * (1) The domain is already in the "power off" state. | |
546 | * (2) System suspend is in progress. | |
547 | */ | |
41e2c8e0 | 548 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
549 | return 0; |
550 | ||
ffaa42e8 UH |
551 | /* |
552 | * Abort power off for the PM domain in the following situations: | |
553 | * (1) The domain is configured as always on. | |
554 | * (2) When the domain has a subdomain being powered on. | |
555 | */ | |
ed61e18a LC |
556 | if (genpd_is_always_on(genpd) || |
557 | genpd_is_rpm_always_on(genpd) || | |
558 | atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
559 | return -EBUSY; |
560 | ||
561 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
562 | enum pm_qos_flags_status stat; | |
563 | ||
20f97caf | 564 | stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF); |
1f8728b7 UH |
565 | if (stat > PM_QOS_FLAGS_NONE) |
566 | return -EBUSY; | |
567 | ||
568 | /* | |
569 | * Do not allow PM domain to be powered off, when an IRQ safe | |
570 | * device is part of a non-IRQ safe domain. | |
571 | */ | |
572 | if (!pm_runtime_suspended(pdd->dev) || | |
573 | irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd)) | |
574 | not_suspended++; | |
575 | } | |
576 | ||
3c64649d | 577 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
578 | return -EBUSY; |
579 | ||
580 | if (genpd->gov && genpd->gov->power_down_ok) { | |
581 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
582 | return -EAGAIN; | |
583 | } | |
584 | ||
2c9b7f87 UH |
585 | /* Default to shallowest state. */ |
586 | if (!genpd->gov) | |
587 | genpd->state_idx = 0; | |
588 | ||
f63816e4 UH |
589 | /* Don't power off, if a child domain is waiting to power on. */ |
590 | if (atomic_read(&genpd->sd_count) > 0) | |
591 | return -EBUSY; | |
1f8728b7 | 592 | |
f63816e4 | 593 | ret = _genpd_power_off(genpd, true); |
c6a113b5 LI |
594 | if (ret) { |
595 | genpd->states[genpd->state_idx].rejected++; | |
f63816e4 | 596 | return ret; |
c6a113b5 | 597 | } |
1f8728b7 | 598 | |
49f618e1 | 599 | genpd->status = GENPD_STATE_OFF; |
afece3ab | 600 | genpd_update_accounting(genpd); |
c6a113b5 | 601 | genpd->states[genpd->state_idx].usage++; |
1f8728b7 | 602 | |
8d87ae48 KC |
603 | list_for_each_entry(link, &genpd->child_links, child_node) { |
604 | genpd_sd_counter_dec(link->parent); | |
605 | genpd_lock_nested(link->parent, depth + 1); | |
606 | genpd_power_off(link->parent, false, depth + 1); | |
607 | genpd_unlock(link->parent); | |
1f8728b7 UH |
608 | } |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
5248051b | 613 | /** |
8d87ae48 | 614 | * genpd_power_on - Restore power to a given PM domain and its parents. |
5248051b | 615 | * @genpd: PM domain to power up. |
0106ef51 | 616 | * @depth: nesting count for lockdep. |
5248051b | 617 | * |
8d87ae48 | 618 | * Restore power to @genpd and all of its parents so that it is possible to |
5248051b RW |
619 | * resume a device belonging to it. |
620 | */ | |
86e12eac | 621 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 622 | { |
5063ce15 | 623 | struct gpd_link *link; |
5248051b RW |
624 | int ret = 0; |
625 | ||
41e2c8e0 | 626 | if (genpd_status_on(genpd)) |
3f241775 | 627 | return 0; |
5248051b | 628 | |
5063ce15 RW |
629 | /* |
630 | * The list is guaranteed not to change while the loop below is being | |
8d87ae48 | 631 | * executed, unless one of the parents' .power_on() callbacks fiddles |
5063ce15 RW |
632 | * with it. |
633 | */ | |
8d87ae48 KC |
634 | list_for_each_entry(link, &genpd->child_links, child_node) { |
635 | struct generic_pm_domain *parent = link->parent; | |
0106ef51 | 636 | |
8d87ae48 | 637 | genpd_sd_counter_inc(parent); |
0106ef51 | 638 | |
8d87ae48 KC |
639 | genpd_lock_nested(parent, depth + 1); |
640 | ret = genpd_power_on(parent, depth + 1); | |
641 | genpd_unlock(parent); | |
5248051b | 642 | |
5063ce15 | 643 | if (ret) { |
8d87ae48 | 644 | genpd_sd_counter_dec(parent); |
9e08cf42 | 645 | goto err; |
5063ce15 | 646 | } |
5248051b RW |
647 | } |
648 | ||
86e12eac | 649 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
650 | if (ret) |
651 | goto err; | |
5248051b | 652 | |
49f618e1 | 653 | genpd->status = GENPD_STATE_ON; |
afece3ab TG |
654 | genpd_update_accounting(genpd); |
655 | ||
3f241775 | 656 | return 0; |
9e08cf42 RW |
657 | |
658 | err: | |
29e47e21 | 659 | list_for_each_entry_continue_reverse(link, |
8d87ae48 KC |
660 | &genpd->child_links, |
661 | child_node) { | |
662 | genpd_sd_counter_dec(link->parent); | |
663 | genpd_lock_nested(link->parent, depth + 1); | |
664 | genpd_power_off(link->parent, false, depth + 1); | |
665 | genpd_unlock(link->parent); | |
29e47e21 | 666 | } |
9e08cf42 | 667 | |
3f241775 RW |
668 | return ret; |
669 | } | |
670 | ||
ea71c596 UH |
671 | static int genpd_dev_pm_start(struct device *dev) |
672 | { | |
673 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
674 | ||
675 | return genpd_start_dev(genpd, dev); | |
676 | } | |
677 | ||
6ff7bb0d RW |
678 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
679 | unsigned long val, void *ptr) | |
680 | { | |
681 | struct generic_pm_domain_data *gpd_data; | |
682 | struct device *dev; | |
683 | ||
684 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 685 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
686 | |
687 | for (;;) { | |
688 | struct generic_pm_domain *genpd; | |
689 | struct pm_domain_data *pdd; | |
690 | ||
691 | spin_lock_irq(&dev->power.lock); | |
692 | ||
693 | pdd = dev->power.subsys_data ? | |
694 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 695 | if (pdd) { |
6ff7bb0d RW |
696 | to_gpd_data(pdd)->td.constraint_changed = true; |
697 | genpd = dev_to_genpd(dev); | |
698 | } else { | |
699 | genpd = ERR_PTR(-ENODATA); | |
700 | } | |
701 | ||
702 | spin_unlock_irq(&dev->power.lock); | |
703 | ||
704 | if (!IS_ERR(genpd)) { | |
35241d12 | 705 | genpd_lock(genpd); |
6ff7bb0d | 706 | genpd->max_off_time_changed = true; |
35241d12 | 707 | genpd_unlock(genpd); |
6ff7bb0d RW |
708 | } |
709 | ||
710 | dev = dev->parent; | |
711 | if (!dev || dev->power.ignore_children) | |
712 | break; | |
713 | } | |
714 | ||
715 | return NOTIFY_DONE; | |
716 | } | |
717 | ||
f721889f RW |
718 | /** |
719 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
720 | * @work: Work structure used for scheduling the execution of this function. | |
721 | */ | |
722 | static void genpd_power_off_work_fn(struct work_struct *work) | |
723 | { | |
724 | struct generic_pm_domain *genpd; | |
725 | ||
726 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
727 | ||
35241d12 | 728 | genpd_lock(genpd); |
2da83545 | 729 | genpd_power_off(genpd, false, 0); |
35241d12 | 730 | genpd_unlock(genpd); |
f721889f RW |
731 | } |
732 | ||
54eeddbf UH |
733 | /** |
734 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
735 | * @dev: Device to handle. | |
736 | */ | |
737 | static int __genpd_runtime_suspend(struct device *dev) | |
738 | { | |
739 | int (*cb)(struct device *__dev); | |
740 | ||
741 | if (dev->type && dev->type->pm) | |
742 | cb = dev->type->pm->runtime_suspend; | |
743 | else if (dev->class && dev->class->pm) | |
744 | cb = dev->class->pm->runtime_suspend; | |
745 | else if (dev->bus && dev->bus->pm) | |
746 | cb = dev->bus->pm->runtime_suspend; | |
747 | else | |
748 | cb = NULL; | |
749 | ||
750 | if (!cb && dev->driver && dev->driver->pm) | |
751 | cb = dev->driver->pm->runtime_suspend; | |
752 | ||
753 | return cb ? cb(dev) : 0; | |
754 | } | |
755 | ||
756 | /** | |
757 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
758 | * @dev: Device to handle. | |
759 | */ | |
760 | static int __genpd_runtime_resume(struct device *dev) | |
761 | { | |
762 | int (*cb)(struct device *__dev); | |
763 | ||
764 | if (dev->type && dev->type->pm) | |
765 | cb = dev->type->pm->runtime_resume; | |
766 | else if (dev->class && dev->class->pm) | |
767 | cb = dev->class->pm->runtime_resume; | |
768 | else if (dev->bus && dev->bus->pm) | |
769 | cb = dev->bus->pm->runtime_resume; | |
770 | else | |
771 | cb = NULL; | |
772 | ||
773 | if (!cb && dev->driver && dev->driver->pm) | |
774 | cb = dev->driver->pm->runtime_resume; | |
775 | ||
776 | return cb ? cb(dev) : 0; | |
777 | } | |
778 | ||
f721889f | 779 | /** |
795bd2e7 | 780 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
781 | * @dev: Device to suspend. |
782 | * | |
783 | * Carry out a runtime suspend of a device under the assumption that its | |
784 | * pm_domain field points to the domain member of an object of type | |
785 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
786 | */ | |
795bd2e7 | 787 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
788 | { |
789 | struct generic_pm_domain *genpd; | |
9df3921e | 790 | bool (*suspend_ok)(struct device *__dev); |
2b1d88cd | 791 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 792 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
793 | ktime_t time_start; |
794 | s64 elapsed_ns; | |
d5e4cbfe | 795 | int ret; |
f721889f RW |
796 | |
797 | dev_dbg(dev, "%s()\n", __func__); | |
798 | ||
5248051b RW |
799 | genpd = dev_to_genpd(dev); |
800 | if (IS_ERR(genpd)) | |
f721889f RW |
801 | return -EINVAL; |
802 | ||
ffe12855 UH |
803 | /* |
804 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
805 | * callbacks for other purposes than runtime PM. In those scenarios | |
806 | * runtime PM is disabled. Under these circumstances, we shall skip | |
807 | * validating/measuring the PM QoS latency. | |
808 | */ | |
9df3921e UH |
809 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
810 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
811 | return -EBUSY; |
812 | ||
2b1d88cd | 813 | /* Measure suspend latency. */ |
d33d5a6c | 814 | time_start = 0; |
ffe12855 UH |
815 | if (runtime_pm) |
816 | time_start = ktime_get(); | |
2b1d88cd | 817 | |
54eeddbf | 818 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
819 | if (ret) |
820 | return ret; | |
17b75eca | 821 | |
2b1d88cd | 822 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 823 | if (ret) { |
54eeddbf | 824 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
825 | return ret; |
826 | } | |
827 | ||
2b1d88cd | 828 | /* Update suspend latency value if the measured time exceeds it. */ |
ffe12855 UH |
829 | if (runtime_pm) { |
830 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
831 | if (elapsed_ns > td->suspend_latency_ns) { | |
832 | td->suspend_latency_ns = elapsed_ns; | |
833 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
834 | elapsed_ns); | |
835 | genpd->max_off_time_changed = true; | |
836 | td->constraint_changed = true; | |
837 | } | |
2b1d88cd UH |
838 | } |
839 | ||
0aa2a221 | 840 | /* |
d716f479 LI |
841 | * If power.irq_safe is set, this routine may be run with |
842 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 843 | */ |
d716f479 | 844 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) |
0aa2a221 RW |
845 | return 0; |
846 | ||
35241d12 | 847 | genpd_lock(genpd); |
2da83545 | 848 | genpd_power_off(genpd, true, 0); |
35241d12 | 849 | genpd_unlock(genpd); |
f721889f RW |
850 | |
851 | return 0; | |
852 | } | |
853 | ||
f721889f | 854 | /** |
795bd2e7 | 855 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
856 | * @dev: Device to resume. |
857 | * | |
858 | * Carry out a runtime resume of a device under the assumption that its | |
859 | * pm_domain field points to the domain member of an object of type | |
860 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
861 | */ | |
795bd2e7 | 862 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
863 | { |
864 | struct generic_pm_domain *genpd; | |
2b1d88cd | 865 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
ffe12855 | 866 | bool runtime_pm = pm_runtime_enabled(dev); |
2b1d88cd UH |
867 | ktime_t time_start; |
868 | s64 elapsed_ns; | |
f721889f | 869 | int ret; |
ba2bbfbf | 870 | bool timed = true; |
f721889f RW |
871 | |
872 | dev_dbg(dev, "%s()\n", __func__); | |
873 | ||
5248051b RW |
874 | genpd = dev_to_genpd(dev); |
875 | if (IS_ERR(genpd)) | |
f721889f RW |
876 | return -EINVAL; |
877 | ||
d716f479 LI |
878 | /* |
879 | * As we don't power off a non IRQ safe domain, which holds | |
880 | * an IRQ safe device, we don't need to restore power to it. | |
881 | */ | |
882 | if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) { | |
ba2bbfbf UH |
883 | timed = false; |
884 | goto out; | |
885 | } | |
0aa2a221 | 886 | |
35241d12 | 887 | genpd_lock(genpd); |
86e12eac | 888 | ret = genpd_power_on(genpd, 0); |
35241d12 | 889 | genpd_unlock(genpd); |
c6d22b37 | 890 | |
ba2bbfbf UH |
891 | if (ret) |
892 | return ret; | |
c6d22b37 | 893 | |
ba2bbfbf | 894 | out: |
2b1d88cd | 895 | /* Measure resume latency. */ |
ab51e6ba | 896 | time_start = 0; |
ffe12855 | 897 | if (timed && runtime_pm) |
2b1d88cd UH |
898 | time_start = ktime_get(); |
899 | ||
076395ca LP |
900 | ret = genpd_start_dev(genpd, dev); |
901 | if (ret) | |
902 | goto err_poweroff; | |
903 | ||
54eeddbf | 904 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
905 | if (ret) |
906 | goto err_stop; | |
2b1d88cd UH |
907 | |
908 | /* Update resume latency value if the measured time exceeds it. */ | |
ffe12855 | 909 | if (timed && runtime_pm) { |
2b1d88cd UH |
910 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
911 | if (elapsed_ns > td->resume_latency_ns) { | |
912 | td->resume_latency_ns = elapsed_ns; | |
913 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
914 | elapsed_ns); | |
915 | genpd->max_off_time_changed = true; | |
916 | td->constraint_changed = true; | |
917 | } | |
918 | } | |
17b75eca | 919 | |
f721889f | 920 | return 0; |
076395ca LP |
921 | |
922 | err_stop: | |
923 | genpd_stop_dev(genpd, dev); | |
924 | err_poweroff: | |
d716f479 LI |
925 | if (!pm_runtime_is_irq_safe(dev) || |
926 | (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) { | |
35241d12 | 927 | genpd_lock(genpd); |
2da83545 | 928 | genpd_power_off(genpd, true, 0); |
35241d12 | 929 | genpd_unlock(genpd); |
076395ca LP |
930 | } |
931 | ||
932 | return ret; | |
f721889f RW |
933 | } |
934 | ||
39ac5ba5 TB |
935 | static bool pd_ignore_unused; |
936 | static int __init pd_ignore_unused_setup(char *__unused) | |
937 | { | |
938 | pd_ignore_unused = true; | |
939 | return 1; | |
940 | } | |
941 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
942 | ||
17f2ae7f | 943 | /** |
86e12eac | 944 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 945 | */ |
86e12eac | 946 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
947 | { |
948 | struct generic_pm_domain *genpd; | |
949 | ||
39ac5ba5 TB |
950 | if (pd_ignore_unused) { |
951 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 952 | return 0; |
39ac5ba5 TB |
953 | } |
954 | ||
17f2ae7f RW |
955 | mutex_lock(&gpd_list_lock); |
956 | ||
957 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
958 | genpd_queue_power_off_work(genpd); | |
959 | ||
960 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 961 | |
2fe71dcd UH |
962 | return 0; |
963 | } | |
86e12eac | 964 | late_initcall(genpd_power_off_unused); |
2fe71dcd | 965 | |
0159ec67 JH |
966 | #ifdef CONFIG_PM_SLEEP |
967 | ||
596ba34b | 968 | /** |
8d87ae48 | 969 | * genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
596ba34b | 970 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
971 | * @use_lock: use the lock. |
972 | * @depth: nesting count for lockdep. | |
596ba34b RW |
973 | * |
974 | * Check if the given PM domain can be powered off (during system suspend or | |
8d87ae48 | 975 | * hibernation) and do that if so. Also, in that case propagate to its parents. |
596ba34b | 976 | * |
77f827de | 977 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
978 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
979 | * these cases the lock must be held. | |
596ba34b | 980 | */ |
0883ac03 UH |
981 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
982 | unsigned int depth) | |
596ba34b | 983 | { |
5063ce15 | 984 | struct gpd_link *link; |
596ba34b | 985 | |
ffaa42e8 | 986 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
987 | return; |
988 | ||
c4bb3160 RW |
989 | if (genpd->suspended_count != genpd->device_count |
990 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
991 | return; |
992 | ||
fc5cbf0c AH |
993 | /* Choose the deepest state when suspending */ |
994 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
995 | if (_genpd_power_off(genpd, false)) |
996 | return; | |
596ba34b | 997 | |
49f618e1 | 998 | genpd->status = GENPD_STATE_OFF; |
5063ce15 | 999 | |
8d87ae48 KC |
1000 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1001 | genpd_sd_counter_dec(link->parent); | |
0883ac03 UH |
1002 | |
1003 | if (use_lock) | |
8d87ae48 | 1004 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1005 | |
8d87ae48 | 1006 | genpd_sync_power_off(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1007 | |
1008 | if (use_lock) | |
8d87ae48 | 1009 | genpd_unlock(link->parent); |
596ba34b RW |
1010 | } |
1011 | } | |
1012 | ||
802d8b49 | 1013 | /** |
8d87ae48 | 1014 | * genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
802d8b49 | 1015 | * @genpd: PM domain to power on. |
0883ac03 UH |
1016 | * @use_lock: use the lock. |
1017 | * @depth: nesting count for lockdep. | |
802d8b49 | 1018 | * |
77f827de | 1019 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1020 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1021 | * these cases the lock must be held. | |
802d8b49 | 1022 | */ |
0883ac03 UH |
1023 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1024 | unsigned int depth) | |
802d8b49 RW |
1025 | { |
1026 | struct gpd_link *link; | |
1027 | ||
41e2c8e0 | 1028 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1029 | return; |
1030 | ||
8d87ae48 KC |
1031 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1032 | genpd_sd_counter_inc(link->parent); | |
0883ac03 UH |
1033 | |
1034 | if (use_lock) | |
8d87ae48 | 1035 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1036 | |
8d87ae48 | 1037 | genpd_sync_power_on(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1038 | |
1039 | if (use_lock) | |
8d87ae48 | 1040 | genpd_unlock(link->parent); |
802d8b49 RW |
1041 | } |
1042 | ||
86e12eac | 1043 | _genpd_power_on(genpd, false); |
49f618e1 | 1044 | genpd->status = GENPD_STATE_ON; |
802d8b49 RW |
1045 | } |
1046 | ||
4ecd6e65 RW |
1047 | /** |
1048 | * resume_needed - Check whether to resume a device before system suspend. | |
1049 | * @dev: Device to check. | |
1050 | * @genpd: PM domain the device belongs to. | |
1051 | * | |
1052 | * There are two cases in which a device that can wake up the system from sleep | |
9e9704ea | 1053 | * states should be resumed by genpd_prepare(): (1) if the device is enabled |
4ecd6e65 RW |
1054 | * to wake up the system and it has to remain active for this purpose while the |
1055 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
1056 | * the system from sleep states and it generally doesn't generate wakeup signals | |
1057 | * by itself (those signals are generated on its behalf by other parts of the | |
1058 | * system). In the latter case it may be necessary to reconfigure the device's | |
1059 | * wakeup settings during system suspend, because it may have been set up to | |
1060 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
1061 | * Return 'true' in either of the above cases. | |
1062 | */ | |
d8600c8b KK |
1063 | static bool resume_needed(struct device *dev, |
1064 | const struct generic_pm_domain *genpd) | |
4ecd6e65 RW |
1065 | { |
1066 | bool active_wakeup; | |
1067 | ||
1068 | if (!device_can_wakeup(dev)) | |
1069 | return false; | |
1070 | ||
d0af45f1 | 1071 | active_wakeup = genpd_is_active_wakeup(genpd); |
4ecd6e65 RW |
1072 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
1073 | } | |
1074 | ||
596ba34b | 1075 | /** |
9e9704ea | 1076 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1077 | * @dev: Device to start the transition of. |
1078 | * | |
1079 | * Start a power transition of a device (during a system-wide power transition) | |
1080 | * under the assumption that its pm_domain field points to the domain member of | |
1081 | * an object of type struct generic_pm_domain representing a PM domain | |
1082 | * consisting of I/O devices. | |
1083 | */ | |
9e9704ea | 1084 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1085 | { |
1086 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1087 | int ret; |
596ba34b RW |
1088 | |
1089 | dev_dbg(dev, "%s()\n", __func__); | |
1090 | ||
1091 | genpd = dev_to_genpd(dev); | |
1092 | if (IS_ERR(genpd)) | |
1093 | return -EINVAL; | |
1094 | ||
17b75eca RW |
1095 | /* |
1096 | * If a wakeup request is pending for the device, it should be woken up | |
1097 | * at this point and a system wakeup event should be reported if it's | |
1098 | * set up to wake up the system from sleep states. | |
1099 | */ | |
4ecd6e65 RW |
1100 | if (resume_needed(dev, genpd)) |
1101 | pm_runtime_resume(dev); | |
1102 | ||
35241d12 | 1103 | genpd_lock(genpd); |
596ba34b | 1104 | |
39dd0f23 | 1105 | if (genpd->prepared_count++ == 0) |
65533bbf | 1106 | genpd->suspended_count = 0; |
17b75eca | 1107 | |
35241d12 | 1108 | genpd_unlock(genpd); |
596ba34b | 1109 | |
b6c10c84 | 1110 | ret = pm_generic_prepare(dev); |
5241ab40 | 1111 | if (ret < 0) { |
35241d12 | 1112 | genpd_lock(genpd); |
b6c10c84 | 1113 | |
39dd0f23 | 1114 | genpd->prepared_count--; |
b6c10c84 | 1115 | |
35241d12 | 1116 | genpd_unlock(genpd); |
b6c10c84 | 1117 | } |
17b75eca | 1118 | |
5241ab40 UH |
1119 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1120 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1121 | } |
1122 | ||
0496c8ae | 1123 | /** |
10da6542 MP |
1124 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1125 | * I/O pm domain. | |
0496c8ae | 1126 | * @dev: Device to suspend. |
10da6542 | 1127 | * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback. |
0496c8ae RW |
1128 | * |
1129 | * Stop the device and remove power from the domain if all devices in it have | |
1130 | * been stopped. | |
1131 | */ | |
10da6542 | 1132 | static int genpd_finish_suspend(struct device *dev, bool poweroff) |
0496c8ae RW |
1133 | { |
1134 | struct generic_pm_domain *genpd; | |
a935424b | 1135 | int ret = 0; |
0496c8ae | 1136 | |
0496c8ae RW |
1137 | genpd = dev_to_genpd(dev); |
1138 | if (IS_ERR(genpd)) | |
1139 | return -EINVAL; | |
596ba34b | 1140 | |
10da6542 MP |
1141 | if (poweroff) |
1142 | ret = pm_generic_poweroff_noirq(dev); | |
1143 | else | |
1144 | ret = pm_generic_suspend_noirq(dev); | |
1145 | if (ret) | |
1146 | return ret; | |
1147 | ||
a935424b UH |
1148 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
1149 | return 0; | |
1150 | ||
17218e00 RW |
1151 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1152 | !pm_runtime_status_suspended(dev)) { | |
1153 | ret = genpd_stop_dev(genpd, dev); | |
a935424b UH |
1154 | if (ret) { |
1155 | if (poweroff) | |
1156 | pm_generic_restore_noirq(dev); | |
1157 | else | |
1158 | pm_generic_resume_noirq(dev); | |
122a2237 | 1159 | return ret; |
a935424b | 1160 | } |
122a2237 UH |
1161 | } |
1162 | ||
0883ac03 | 1163 | genpd_lock(genpd); |
596ba34b | 1164 | genpd->suspended_count++; |
0883ac03 UH |
1165 | genpd_sync_power_off(genpd, true, 0); |
1166 | genpd_unlock(genpd); | |
596ba34b RW |
1167 | |
1168 | return 0; | |
1169 | } | |
1170 | ||
10da6542 | 1171 | /** |
9e9704ea | 1172 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1173 | * @dev: Device to suspend. |
1174 | * | |
1175 | * Stop the device and remove power from the domain if all devices in it have | |
1176 | * been stopped. | |
1177 | */ | |
9e9704ea | 1178 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1179 | { |
1180 | dev_dbg(dev, "%s()\n", __func__); | |
1181 | ||
1182 | return genpd_finish_suspend(dev, false); | |
1183 | } | |
1184 | ||
596ba34b | 1185 | /** |
9e9704ea | 1186 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
1187 | * @dev: Device to resume. |
1188 | * | |
0496c8ae | 1189 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1190 | */ |
9e9704ea | 1191 | static int genpd_resume_noirq(struct device *dev) |
596ba34b RW |
1192 | { |
1193 | struct generic_pm_domain *genpd; | |
a935424b | 1194 | int ret; |
596ba34b RW |
1195 | |
1196 | dev_dbg(dev, "%s()\n", __func__); | |
1197 | ||
1198 | genpd = dev_to_genpd(dev); | |
1199 | if (IS_ERR(genpd)) | |
1200 | return -EINVAL; | |
1201 | ||
d0af45f1 | 1202 | if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd)) |
a935424b | 1203 | return pm_generic_resume_noirq(dev); |
596ba34b | 1204 | |
0883ac03 UH |
1205 | genpd_lock(genpd); |
1206 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1207 | genpd->suspended_count--; |
0883ac03 | 1208 | genpd_unlock(genpd); |
596ba34b | 1209 | |
17218e00 RW |
1210 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1211 | !pm_runtime_status_suspended(dev)) { | |
1212 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1213 | if (ret) |
1214 | return ret; | |
1215 | } | |
122a2237 | 1216 | |
a935424b | 1217 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1218 | } |
1219 | ||
0496c8ae | 1220 | /** |
9e9704ea | 1221 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1222 | * @dev: Device to freeze. |
1223 | * | |
1224 | * Carry out a late freeze of a device under the assumption that its | |
1225 | * pm_domain field points to the domain member of an object of type | |
1226 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1227 | * devices. | |
1228 | */ | |
9e9704ea | 1229 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1230 | { |
d8600c8b | 1231 | const struct generic_pm_domain *genpd; |
122a2237 | 1232 | int ret = 0; |
596ba34b RW |
1233 | |
1234 | dev_dbg(dev, "%s()\n", __func__); | |
1235 | ||
1236 | genpd = dev_to_genpd(dev); | |
1237 | if (IS_ERR(genpd)) | |
1238 | return -EINVAL; | |
1239 | ||
10da6542 MP |
1240 | ret = pm_generic_freeze_noirq(dev); |
1241 | if (ret) | |
1242 | return ret; | |
1243 | ||
17218e00 RW |
1244 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1245 | !pm_runtime_status_suspended(dev)) | |
1246 | ret = genpd_stop_dev(genpd, dev); | |
122a2237 UH |
1247 | |
1248 | return ret; | |
0496c8ae | 1249 | } |
596ba34b | 1250 | |
0496c8ae | 1251 | /** |
9e9704ea | 1252 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1253 | * @dev: Device to thaw. |
1254 | * | |
1255 | * Start the device, unless power has been removed from the domain already | |
1256 | * before the system transition. | |
1257 | */ | |
9e9704ea | 1258 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1259 | { |
d8600c8b | 1260 | const struct generic_pm_domain *genpd; |
122a2237 | 1261 | int ret = 0; |
596ba34b | 1262 | |
0496c8ae | 1263 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1264 | |
0496c8ae RW |
1265 | genpd = dev_to_genpd(dev); |
1266 | if (IS_ERR(genpd)) | |
1267 | return -EINVAL; | |
1268 | ||
17218e00 RW |
1269 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1270 | !pm_runtime_status_suspended(dev)) { | |
1271 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1272 | if (ret) |
1273 | return ret; | |
1274 | } | |
122a2237 | 1275 | |
10da6542 MP |
1276 | return pm_generic_thaw_noirq(dev); |
1277 | } | |
1278 | ||
1279 | /** | |
9e9704ea | 1280 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1281 | * I/O PM domain. |
1282 | * @dev: Device to poweroff. | |
1283 | * | |
1284 | * Stop the device and remove power from the domain if all devices in it have | |
1285 | * been stopped. | |
1286 | */ | |
9e9704ea | 1287 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1288 | { |
1289 | dev_dbg(dev, "%s()\n", __func__); | |
1290 | ||
1291 | return genpd_finish_suspend(dev, true); | |
596ba34b RW |
1292 | } |
1293 | ||
596ba34b | 1294 | /** |
9e9704ea | 1295 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1296 | * @dev: Device to resume. |
1297 | * | |
0496c8ae RW |
1298 | * Make sure the domain will be in the same power state as before the |
1299 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1300 | */ |
9e9704ea | 1301 | static int genpd_restore_noirq(struct device *dev) |
596ba34b RW |
1302 | { |
1303 | struct generic_pm_domain *genpd; | |
122a2237 | 1304 | int ret = 0; |
596ba34b RW |
1305 | |
1306 | dev_dbg(dev, "%s()\n", __func__); | |
1307 | ||
1308 | genpd = dev_to_genpd(dev); | |
1309 | if (IS_ERR(genpd)) | |
1310 | return -EINVAL; | |
1311 | ||
1312 | /* | |
65533bbf RW |
1313 | * At this point suspended_count == 0 means we are being run for the |
1314 | * first time for the given domain in the present cycle. | |
596ba34b | 1315 | */ |
0883ac03 | 1316 | genpd_lock(genpd); |
505a70b7 | 1317 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1318 | /* |
65533bbf | 1319 | * The boot kernel might put the domain into arbitrary state, |
86e12eac | 1320 | * so make it appear as powered off to genpd_sync_power_on(), |
802d8b49 | 1321 | * so that it tries to power it on in case it was really off. |
596ba34b | 1322 | */ |
49f618e1 | 1323 | genpd->status = GENPD_STATE_OFF; |
505a70b7 | 1324 | } |
18dd2ece | 1325 | |
0883ac03 UH |
1326 | genpd_sync_power_on(genpd, true, 0); |
1327 | genpd_unlock(genpd); | |
596ba34b | 1328 | |
17218e00 RW |
1329 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1330 | !pm_runtime_status_suspended(dev)) { | |
1331 | ret = genpd_start_dev(genpd, dev); | |
10da6542 MP |
1332 | if (ret) |
1333 | return ret; | |
1334 | } | |
122a2237 | 1335 | |
10da6542 | 1336 | return pm_generic_restore_noirq(dev); |
596ba34b RW |
1337 | } |
1338 | ||
1339 | /** | |
9e9704ea | 1340 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1341 | * @dev: Device to complete the transition of. |
1342 | * | |
1343 | * Complete a power transition of a device (during a system-wide power | |
1344 | * transition) under the assumption that its pm_domain field points to the | |
1345 | * domain member of an object of type struct generic_pm_domain representing | |
1346 | * a power domain consisting of I/O devices. | |
1347 | */ | |
9e9704ea | 1348 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1349 | { |
1350 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1351 | |
1352 | dev_dbg(dev, "%s()\n", __func__); | |
1353 | ||
1354 | genpd = dev_to_genpd(dev); | |
1355 | if (IS_ERR(genpd)) | |
1356 | return; | |
1357 | ||
4d23a5e8 UH |
1358 | pm_generic_complete(dev); |
1359 | ||
35241d12 | 1360 | genpd_lock(genpd); |
596ba34b | 1361 | |
39dd0f23 | 1362 | genpd->prepared_count--; |
4d23a5e8 UH |
1363 | if (!genpd->prepared_count) |
1364 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1365 | |
35241d12 | 1366 | genpd_unlock(genpd); |
596ba34b RW |
1367 | } |
1368 | ||
77f827de | 1369 | /** |
d47e6464 | 1370 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1371 | * @dev: Device that normally is marked as "always on" to switch power for. |
1372 | * | |
1373 | * This routine may only be called during the system core (syscore) suspend or | |
1374 | * resume phase for devices whose "always on" flags are set. | |
1375 | */ | |
d47e6464 | 1376 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1377 | { |
1378 | struct generic_pm_domain *genpd; | |
1379 | ||
fe0c2baa UH |
1380 | genpd = dev_to_genpd_safe(dev); |
1381 | if (!genpd) | |
77f827de RW |
1382 | return; |
1383 | ||
1384 | if (suspend) { | |
1385 | genpd->suspended_count++; | |
0883ac03 | 1386 | genpd_sync_power_off(genpd, false, 0); |
77f827de | 1387 | } else { |
0883ac03 | 1388 | genpd_sync_power_on(genpd, false, 0); |
77f827de RW |
1389 | genpd->suspended_count--; |
1390 | } | |
1391 | } | |
d47e6464 UH |
1392 | |
1393 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1394 | { | |
1395 | genpd_syscore_switch(dev, true); | |
1396 | } | |
1397 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1398 | ||
1399 | void pm_genpd_syscore_poweron(struct device *dev) | |
1400 | { | |
1401 | genpd_syscore_switch(dev, false); | |
1402 | } | |
1403 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1404 | |
d30d819d | 1405 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1406 | |
9e9704ea UH |
1407 | #define genpd_prepare NULL |
1408 | #define genpd_suspend_noirq NULL | |
1409 | #define genpd_resume_noirq NULL | |
1410 | #define genpd_freeze_noirq NULL | |
1411 | #define genpd_thaw_noirq NULL | |
1412 | #define genpd_poweroff_noirq NULL | |
1413 | #define genpd_restore_noirq NULL | |
1414 | #define genpd_complete NULL | |
596ba34b RW |
1415 | |
1416 | #endif /* CONFIG_PM_SLEEP */ | |
1417 | ||
a174920d | 1418 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev) |
1d5fcfec RW |
1419 | { |
1420 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1421 | int ret; |
1422 | ||
1423 | ret = dev_pm_get_subsys_data(dev); | |
1424 | if (ret) | |
1425 | return ERR_PTR(ret); | |
1d5fcfec RW |
1426 | |
1427 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1428 | if (!gpd_data) { |
1429 | ret = -ENOMEM; | |
1430 | goto err_put; | |
1431 | } | |
1d5fcfec | 1432 | |
f104e1e5 | 1433 | gpd_data->base.dev = dev; |
f104e1e5 | 1434 | gpd_data->td.constraint_changed = true; |
0759e80b | 1435 | gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
f104e1e5 UH |
1436 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1437 | ||
1438 | spin_lock_irq(&dev->power.lock); | |
1439 | ||
1440 | if (dev->power.subsys_data->domain_data) { | |
1441 | ret = -EINVAL; | |
1442 | goto err_free; | |
1443 | } | |
1444 | ||
1445 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1446 | |
1447 | spin_unlock_irq(&dev->power.lock); | |
1448 | ||
1d5fcfec | 1449 | return gpd_data; |
3e235685 | 1450 | |
f104e1e5 UH |
1451 | err_free: |
1452 | spin_unlock_irq(&dev->power.lock); | |
1453 | kfree(gpd_data); | |
3e235685 UH |
1454 | err_put: |
1455 | dev_pm_put_subsys_data(dev); | |
1456 | return ERR_PTR(ret); | |
1d5fcfec RW |
1457 | } |
1458 | ||
49d400c7 UH |
1459 | static void genpd_free_dev_data(struct device *dev, |
1460 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1461 | { |
f104e1e5 UH |
1462 | spin_lock_irq(&dev->power.lock); |
1463 | ||
f104e1e5 UH |
1464 | dev->power.subsys_data->domain_data = NULL; |
1465 | ||
1466 | spin_unlock_irq(&dev->power.lock); | |
1467 | ||
1d5fcfec | 1468 | kfree(gpd_data); |
3e235685 | 1469 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1470 | } |
1471 | ||
b24e1965 UH |
1472 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1473 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1474 | { |
1475 | struct gpd_link *link; | |
1476 | ||
1477 | if (!genpd_is_cpu_domain(genpd)) | |
1478 | return; | |
1479 | ||
8d87ae48 KC |
1480 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1481 | struct generic_pm_domain *parent = link->parent; | |
eb594b73 | 1482 | |
8d87ae48 KC |
1483 | genpd_lock_nested(parent, depth + 1); |
1484 | genpd_update_cpumask(parent, cpu, set, depth + 1); | |
1485 | genpd_unlock(parent); | |
eb594b73 UH |
1486 | } |
1487 | ||
1488 | if (set) | |
1489 | cpumask_set_cpu(cpu, genpd->cpus); | |
1490 | else | |
1491 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1492 | } | |
1493 | ||
b24e1965 UH |
1494 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1495 | { | |
1496 | if (cpu >= 0) | |
1497 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1498 | } | |
1499 | ||
1500 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1501 | { | |
1502 | if (cpu >= 0) | |
1503 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1504 | } | |
1505 | ||
1506 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1507 | { |
1508 | int cpu; | |
1509 | ||
1510 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1511 | return -1; |
eb594b73 UH |
1512 | |
1513 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1514 | if (get_cpu_device(cpu) == dev) |
1515 | return cpu; | |
eb594b73 | 1516 | } |
eb594b73 | 1517 | |
b24e1965 | 1518 | return -1; |
eb594b73 UH |
1519 | } |
1520 | ||
f9ccd7c3 UH |
1521 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1522 | struct device *base_dev) | |
f721889f | 1523 | { |
c0356db7 | 1524 | struct generic_pm_domain_data *gpd_data; |
f9ccd7c3 | 1525 | int ret; |
f721889f RW |
1526 | |
1527 | dev_dbg(dev, "%s()\n", __func__); | |
1528 | ||
1529 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1530 | return -EINVAL; | |
1531 | ||
a174920d | 1532 | gpd_data = genpd_alloc_dev_data(dev); |
3e235685 UH |
1533 | if (IS_ERR(gpd_data)) |
1534 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1535 | |
f9ccd7c3 | 1536 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
b24e1965 | 1537 | |
b472c2fa UH |
1538 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1539 | if (ret) | |
1540 | goto out; | |
d79b6fe1 | 1541 | |
2071ac98 JW |
1542 | genpd_lock(genpd); |
1543 | ||
f9ccd7c3 | 1544 | genpd_set_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1545 | dev_pm_domain_set(dev, &genpd->domain); |
1546 | ||
14b53064 UH |
1547 | genpd->device_count++; |
1548 | genpd->max_off_time_changed = true; | |
1549 | ||
1d5fcfec | 1550 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1551 | |
35241d12 | 1552 | genpd_unlock(genpd); |
2071ac98 | 1553 | out: |
c0356db7 UH |
1554 | if (ret) |
1555 | genpd_free_dev_data(dev, gpd_data); | |
1556 | else | |
0b07ee94 VK |
1557 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
1558 | DEV_PM_QOS_RESUME_LATENCY); | |
1d5fcfec | 1559 | |
f721889f RW |
1560 | return ret; |
1561 | } | |
19efa5ff JH |
1562 | |
1563 | /** | |
1a7a6707 | 1564 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1565 | * @genpd: PM domain to add the device to. |
1566 | * @dev: Device to be added. | |
19efa5ff | 1567 | */ |
1a7a6707 | 1568 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1569 | { |
1570 | int ret; | |
1571 | ||
1572 | mutex_lock(&gpd_list_lock); | |
f9ccd7c3 | 1573 | ret = genpd_add_device(genpd, dev, dev); |
19efa5ff JH |
1574 | mutex_unlock(&gpd_list_lock); |
1575 | ||
1576 | return ret; | |
1577 | } | |
1a7a6707 | 1578 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1579 | |
85168d56 UH |
1580 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1581 | struct device *dev) | |
f721889f | 1582 | { |
6ff7bb0d | 1583 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1584 | struct pm_domain_data *pdd; |
f9ccd7c3 | 1585 | int ret = 0; |
f721889f RW |
1586 | |
1587 | dev_dbg(dev, "%s()\n", __func__); | |
1588 | ||
c0356db7 UH |
1589 | pdd = dev->power.subsys_data->domain_data; |
1590 | gpd_data = to_gpd_data(pdd); | |
0b07ee94 VK |
1591 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
1592 | DEV_PM_QOS_RESUME_LATENCY); | |
c0356db7 | 1593 | |
35241d12 | 1594 | genpd_lock(genpd); |
f721889f | 1595 | |
596ba34b RW |
1596 | if (genpd->prepared_count > 0) { |
1597 | ret = -EAGAIN; | |
1598 | goto out; | |
1599 | } | |
1600 | ||
6ff7bb0d RW |
1601 | genpd->device_count--; |
1602 | genpd->max_off_time_changed = true; | |
1603 | ||
f9ccd7c3 | 1604 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1605 | dev_pm_domain_set(dev, NULL); |
1606 | ||
efa69025 | 1607 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1608 | |
35241d12 | 1609 | genpd_unlock(genpd); |
6ff7bb0d | 1610 | |
2071ac98 JW |
1611 | if (genpd->detach_dev) |
1612 | genpd->detach_dev(genpd, dev); | |
1613 | ||
c1dbe2fb | 1614 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1615 | |
6ff7bb0d | 1616 | return 0; |
f721889f | 1617 | |
596ba34b | 1618 | out: |
35241d12 | 1619 | genpd_unlock(genpd); |
0b07ee94 | 1620 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
f721889f RW |
1621 | |
1622 | return ret; | |
1623 | } | |
85168d56 UH |
1624 | |
1625 | /** | |
1626 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1627 | * @dev: Device to be removed. |
1628 | */ | |
924f4486 | 1629 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1630 | { |
b3ad17c0 | 1631 | struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
924f4486 UH |
1632 | |
1633 | if (!genpd) | |
85168d56 UH |
1634 | return -EINVAL; |
1635 | ||
1636 | return genpd_remove_device(genpd, dev); | |
1637 | } | |
24c96dc7 | 1638 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1639 | |
d4f81383 UH |
1640 | /** |
1641 | * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev | |
1642 | * | |
1643 | * @dev: Device that should be associated with the notifier | |
1644 | * @nb: The notifier block to register | |
1645 | * | |
1646 | * Users may call this function to add a genpd power on/off notifier for an | |
1647 | * attached @dev. Only one notifier per device is allowed. The notifier is | |
1648 | * sent when genpd is powering on/off the PM domain. | |
1649 | * | |
1650 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1651 | * while this routine is getting called. | |
1652 | * | |
1653 | * Returns 0 on success and negative error values on failures. | |
1654 | */ | |
1655 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) | |
1656 | { | |
1657 | struct generic_pm_domain *genpd; | |
1658 | struct generic_pm_domain_data *gpd_data; | |
1659 | int ret; | |
1660 | ||
1661 | genpd = dev_to_genpd_safe(dev); | |
1662 | if (!genpd) | |
1663 | return -ENODEV; | |
1664 | ||
1665 | if (WARN_ON(!dev->power.subsys_data || | |
1666 | !dev->power.subsys_data->domain_data)) | |
1667 | return -EINVAL; | |
1668 | ||
1669 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1670 | if (gpd_data->power_nb) | |
1671 | return -EEXIST; | |
1672 | ||
1673 | genpd_lock(genpd); | |
1674 | ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); | |
1675 | genpd_unlock(genpd); | |
1676 | ||
1677 | if (ret) { | |
1678 | dev_warn(dev, "failed to add notifier for PM domain %s\n", | |
1679 | genpd->name); | |
1680 | return ret; | |
1681 | } | |
1682 | ||
1683 | gpd_data->power_nb = nb; | |
1684 | return 0; | |
1685 | } | |
1686 | EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); | |
1687 | ||
1688 | /** | |
1689 | * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev | |
1690 | * | |
1691 | * @dev: Device that is associated with the notifier | |
1692 | * | |
1693 | * Users may call this function to remove a genpd power on/off notifier for an | |
1694 | * attached @dev. | |
1695 | * | |
1696 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1697 | * while this routine is getting called. | |
1698 | * | |
1699 | * Returns 0 on success and negative error values on failures. | |
1700 | */ | |
1701 | int dev_pm_genpd_remove_notifier(struct device *dev) | |
1702 | { | |
1703 | struct generic_pm_domain *genpd; | |
1704 | struct generic_pm_domain_data *gpd_data; | |
1705 | int ret; | |
1706 | ||
1707 | genpd = dev_to_genpd_safe(dev); | |
1708 | if (!genpd) | |
1709 | return -ENODEV; | |
1710 | ||
1711 | if (WARN_ON(!dev->power.subsys_data || | |
1712 | !dev->power.subsys_data->domain_data)) | |
1713 | return -EINVAL; | |
1714 | ||
1715 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1716 | if (!gpd_data->power_nb) | |
1717 | return -ENODEV; | |
1718 | ||
1719 | genpd_lock(genpd); | |
1720 | ret = raw_notifier_chain_unregister(&genpd->power_notifiers, | |
1721 | gpd_data->power_nb); | |
1722 | genpd_unlock(genpd); | |
1723 | ||
1724 | if (ret) { | |
1725 | dev_warn(dev, "failed to remove notifier for PM domain %s\n", | |
1726 | genpd->name); | |
1727 | return ret; | |
1728 | } | |
1729 | ||
1730 | gpd_data->power_nb = NULL; | |
1731 | return 0; | |
1732 | } | |
1733 | EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); | |
1734 | ||
19efa5ff JH |
1735 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1736 | struct generic_pm_domain *subdomain) | |
f721889f | 1737 | { |
2547923d | 1738 | struct gpd_link *link, *itr; |
f721889f RW |
1739 | int ret = 0; |
1740 | ||
fb7268be RW |
1741 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1742 | || genpd == subdomain) | |
f721889f RW |
1743 | return -EINVAL; |
1744 | ||
d716f479 LI |
1745 | /* |
1746 | * If the domain can be powered on/off in an IRQ safe | |
1747 | * context, ensure that the subdomain can also be | |
1748 | * powered on/off in that context. | |
1749 | */ | |
1750 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1751 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1752 | genpd->name, subdomain->name); |
1753 | return -EINVAL; | |
1754 | } | |
1755 | ||
2547923d LI |
1756 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1757 | if (!link) | |
1758 | return -ENOMEM; | |
1759 | ||
35241d12 LI |
1760 | genpd_lock(subdomain); |
1761 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1762 | |
41e2c8e0 | 1763 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1764 | ret = -EINVAL; |
1765 | goto out; | |
1766 | } | |
1767 | ||
8d87ae48 KC |
1768 | list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
1769 | if (itr->child == subdomain && itr->parent == genpd) { | |
f721889f RW |
1770 | ret = -EINVAL; |
1771 | goto out; | |
1772 | } | |
1773 | } | |
1774 | ||
8d87ae48 KC |
1775 | link->parent = genpd; |
1776 | list_add_tail(&link->parent_node, &genpd->parent_links); | |
1777 | link->child = subdomain; | |
1778 | list_add_tail(&link->child_node, &subdomain->child_links); | |
41e2c8e0 | 1779 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1780 | genpd_sd_counter_inc(genpd); |
f721889f | 1781 | |
f721889f | 1782 | out: |
35241d12 LI |
1783 | genpd_unlock(genpd); |
1784 | genpd_unlock(subdomain); | |
2547923d LI |
1785 | if (ret) |
1786 | kfree(link); | |
f721889f RW |
1787 | return ret; |
1788 | } | |
19efa5ff JH |
1789 | |
1790 | /** | |
1791 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
8d87ae48 | 1792 | * @genpd: Leader PM domain to add the subdomain to. |
19efa5ff JH |
1793 | * @subdomain: Subdomain to be added. |
1794 | */ | |
1795 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1796 | struct generic_pm_domain *subdomain) | |
1797 | { | |
1798 | int ret; | |
1799 | ||
1800 | mutex_lock(&gpd_list_lock); | |
1801 | ret = genpd_add_subdomain(genpd, subdomain); | |
1802 | mutex_unlock(&gpd_list_lock); | |
1803 | ||
1804 | return ret; | |
1805 | } | |
d60ee966 | 1806 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1807 | |
1808 | /** | |
1809 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
8d87ae48 | 1810 | * @genpd: Leader PM domain to remove the subdomain from. |
5063ce15 | 1811 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1812 | */ |
1813 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1814 | struct generic_pm_domain *subdomain) |
f721889f | 1815 | { |
c6e83cac | 1816 | struct gpd_link *l, *link; |
f721889f RW |
1817 | int ret = -EINVAL; |
1818 | ||
5063ce15 | 1819 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1820 | return -EINVAL; |
1821 | ||
35241d12 LI |
1822 | genpd_lock(subdomain); |
1823 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1824 | |
8d87ae48 | 1825 | if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
7a5bd127 JP |
1826 | pr_warn("%s: unable to remove subdomain %s\n", |
1827 | genpd->name, subdomain->name); | |
30e7a65b JH |
1828 | ret = -EBUSY; |
1829 | goto out; | |
1830 | } | |
1831 | ||
8d87ae48 KC |
1832 | list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
1833 | if (link->child != subdomain) | |
f721889f RW |
1834 | continue; |
1835 | ||
8d87ae48 KC |
1836 | list_del(&link->parent_node); |
1837 | list_del(&link->child_node); | |
5063ce15 | 1838 | kfree(link); |
41e2c8e0 | 1839 | if (genpd_status_on(subdomain)) |
f721889f RW |
1840 | genpd_sd_counter_dec(genpd); |
1841 | ||
f721889f RW |
1842 | ret = 0; |
1843 | break; | |
1844 | } | |
1845 | ||
30e7a65b | 1846 | out: |
35241d12 LI |
1847 | genpd_unlock(genpd); |
1848 | genpd_unlock(subdomain); | |
f721889f RW |
1849 | |
1850 | return ret; | |
1851 | } | |
d60ee966 | 1852 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1853 | |
49a27e27 UH |
1854 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1855 | unsigned int state_count) | |
1856 | { | |
1857 | kfree(states); | |
1858 | } | |
1859 | ||
59d65b73 LI |
1860 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1861 | { | |
1862 | struct genpd_power_state *state; | |
1863 | ||
1864 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1865 | if (!state) | |
1866 | return -ENOMEM; | |
1867 | ||
1868 | genpd->states = state; | |
1869 | genpd->state_count = 1; | |
49a27e27 | 1870 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1871 | |
1872 | return 0; | |
1873 | } | |
1874 | ||
d716f479 LI |
1875 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
1876 | { | |
1877 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
1878 | spin_lock_init(&genpd->slock); | |
1879 | genpd->lock_ops = &genpd_spin_ops; | |
1880 | } else { | |
1881 | mutex_init(&genpd->mlock); | |
1882 | genpd->lock_ops = &genpd_mtx_ops; | |
1883 | } | |
1884 | } | |
1885 | ||
f721889f RW |
1886 | /** |
1887 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1888 | * @genpd: PM domain object to initialize. | |
1889 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1890 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
1891 | * |
1892 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 1893 | */ |
7eb231c3 UH |
1894 | int pm_genpd_init(struct generic_pm_domain *genpd, |
1895 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 1896 | { |
59d65b73 LI |
1897 | int ret; |
1898 | ||
f721889f | 1899 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 1900 | return -EINVAL; |
f721889f | 1901 | |
8d87ae48 KC |
1902 | INIT_LIST_HEAD(&genpd->parent_links); |
1903 | INIT_LIST_HEAD(&genpd->child_links); | |
f721889f | 1904 | INIT_LIST_HEAD(&genpd->dev_list); |
d4f81383 | 1905 | RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
d716f479 | 1906 | genpd_lock_init(genpd); |
f721889f RW |
1907 | genpd->gov = gov; |
1908 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1909 | atomic_set(&genpd->sd_count, 0); |
49f618e1 | 1910 | genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
596ba34b | 1911 | genpd->device_count = 0; |
221e9b58 | 1912 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1913 | genpd->max_off_time_changed = true; |
de0aa06d JH |
1914 | genpd->provider = NULL; |
1915 | genpd->has_provider = false; | |
afece3ab | 1916 | genpd->accounting_time = ktime_get(); |
795bd2e7 UH |
1917 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
1918 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
1919 | genpd->domain.ops.prepare = genpd_prepare; |
1920 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
1921 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
1922 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
1923 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
1924 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
1925 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
1926 | genpd->domain.ops.complete = genpd_complete; | |
ea71c596 | 1927 | genpd->domain.start = genpd_dev_pm_start; |
c11f6f5b UH |
1928 | |
1929 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1930 | genpd->dev_ops.stop = pm_clk_suspend; | |
1931 | genpd->dev_ops.start = pm_clk_resume; | |
1932 | } | |
1933 | ||
ffaa42e8 | 1934 | /* Always-on domains must be powered on at initialization. */ |
ed61e18a LC |
1935 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
1936 | !genpd_status_on(genpd)) | |
ffaa42e8 UH |
1937 | return -EINVAL; |
1938 | ||
eb594b73 UH |
1939 | if (genpd_is_cpu_domain(genpd) && |
1940 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
1941 | return -ENOMEM; | |
1942 | ||
fc5cbf0c | 1943 | /* Use only one "off" state if there were no states declared */ |
59d65b73 LI |
1944 | if (genpd->state_count == 0) { |
1945 | ret = genpd_set_default_power_state(genpd); | |
eb594b73 UH |
1946 | if (ret) { |
1947 | if (genpd_is_cpu_domain(genpd)) | |
1948 | free_cpumask_var(genpd->cpus); | |
59d65b73 | 1949 | return ret; |
eb594b73 | 1950 | } |
46b7fe94 | 1951 | } else if (!gov && genpd->state_count > 1) { |
7a5bd127 | 1952 | pr_warn("%s: no governor for states\n", genpd->name); |
59d65b73 | 1953 | } |
fc5cbf0c | 1954 | |
401ea157 VK |
1955 | device_initialize(&genpd->dev); |
1956 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
1957 | ||
5125bbf3 RW |
1958 | mutex_lock(&gpd_list_lock); |
1959 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1960 | mutex_unlock(&gpd_list_lock); | |
7eb231c3 UH |
1961 | |
1962 | return 0; | |
5125bbf3 | 1963 | } |
be5ed55d | 1964 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 1965 | |
3fe57710 JH |
1966 | static int genpd_remove(struct generic_pm_domain *genpd) |
1967 | { | |
1968 | struct gpd_link *l, *link; | |
1969 | ||
1970 | if (IS_ERR_OR_NULL(genpd)) | |
1971 | return -EINVAL; | |
1972 | ||
35241d12 | 1973 | genpd_lock(genpd); |
3fe57710 JH |
1974 | |
1975 | if (genpd->has_provider) { | |
35241d12 | 1976 | genpd_unlock(genpd); |
3fe57710 JH |
1977 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
1978 | return -EBUSY; | |
1979 | } | |
1980 | ||
8d87ae48 | 1981 | if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
35241d12 | 1982 | genpd_unlock(genpd); |
3fe57710 JH |
1983 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
1984 | return -EBUSY; | |
1985 | } | |
1986 | ||
8d87ae48 KC |
1987 | list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
1988 | list_del(&link->parent_node); | |
1989 | list_del(&link->child_node); | |
3fe57710 JH |
1990 | kfree(link); |
1991 | } | |
1992 | ||
1993 | list_del(&genpd->gpd_list_node); | |
35241d12 | 1994 | genpd_unlock(genpd); |
3fe57710 | 1995 | cancel_work_sync(&genpd->power_off_work); |
eb594b73 UH |
1996 | if (genpd_is_cpu_domain(genpd)) |
1997 | free_cpumask_var(genpd->cpus); | |
49a27e27 UH |
1998 | if (genpd->free_states) |
1999 | genpd->free_states(genpd->states, genpd->state_count); | |
2000 | ||
3fe57710 JH |
2001 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
2002 | ||
2003 | return 0; | |
2004 | } | |
2005 | ||
2006 | /** | |
2007 | * pm_genpd_remove - Remove a generic I/O PM domain | |
2008 | * @genpd: Pointer to PM domain that is to be removed. | |
2009 | * | |
2010 | * To remove the PM domain, this function: | |
2011 | * - Removes the PM domain as a subdomain to any parent domains, | |
2012 | * if it was added. | |
2013 | * - Removes the PM domain from the list of registered PM domains. | |
2014 | * | |
2015 | * The PM domain will only be removed, if the associated provider has | |
2016 | * been removed, it is not a parent to any other PM domain and has no | |
2017 | * devices associated with it. | |
2018 | */ | |
2019 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
2020 | { | |
2021 | int ret; | |
2022 | ||
2023 | mutex_lock(&gpd_list_lock); | |
2024 | ret = genpd_remove(genpd); | |
2025 | mutex_unlock(&gpd_list_lock); | |
2026 | ||
2027 | return ret; | |
2028 | } | |
2029 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
2030 | ||
aa42240a | 2031 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 2032 | |
aa42240a TF |
2033 | /* |
2034 | * Device Tree based PM domain providers. | |
2035 | * | |
2036 | * The code below implements generic device tree based PM domain providers that | |
2037 | * bind device tree nodes with generic PM domains registered in the system. | |
2038 | * | |
2039 | * Any driver that registers generic PM domains and needs to support binding of | |
2040 | * devices to these domains is supposed to register a PM domain provider, which | |
2041 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
2042 | * | |
2043 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
2044 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
2045 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
2046 | * index. |
2047 | */ | |
2048 | ||
2049 | /** | |
2050 | * struct of_genpd_provider - PM domain provider registration structure | |
2051 | * @link: Entry in global list of PM domain providers | |
2052 | * @node: Pointer to device tree node of PM domain provider | |
2053 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
2054 | * into a PM domain. | |
2055 | * @data: context pointer to be passed into @xlate callback | |
2056 | */ | |
2057 | struct of_genpd_provider { | |
2058 | struct list_head link; | |
2059 | struct device_node *node; | |
2060 | genpd_xlate_t xlate; | |
2061 | void *data; | |
2062 | }; | |
2063 | ||
2064 | /* List of registered PM domain providers. */ | |
2065 | static LIST_HEAD(of_genpd_providers); | |
2066 | /* Mutex to protect the list above. */ | |
2067 | static DEFINE_MUTEX(of_genpd_mutex); | |
2068 | ||
2069 | /** | |
892ebdcc | 2070 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
2071 | * @genpdspec: OF phandle args to map into a PM domain |
2072 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
2073 | * | |
2074 | * This is a generic xlate function that can be used to model PM domains that | |
2075 | * have their own device tree nodes. The private data of xlate function needs | |
2076 | * to be a valid pointer to struct generic_pm_domain. | |
2077 | */ | |
892ebdcc | 2078 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
2079 | struct of_phandle_args *genpdspec, |
2080 | void *data) | |
2081 | { | |
aa42240a TF |
2082 | return data; |
2083 | } | |
aa42240a TF |
2084 | |
2085 | /** | |
892ebdcc | 2086 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
2087 | * @genpdspec: OF phandle args to map into a PM domain |
2088 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2089 | * | |
2090 | * This is a generic xlate function that can be used to model simple PM domain | |
2091 | * controllers that have one device tree node and provide multiple PM domains. | |
2092 | * A single cell is used as an index into an array of PM domains specified in | |
2093 | * the genpd_onecell_data struct when registering the provider. | |
2094 | */ | |
892ebdcc | 2095 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
2096 | struct of_phandle_args *genpdspec, |
2097 | void *data) | |
2098 | { | |
2099 | struct genpd_onecell_data *genpd_data = data; | |
2100 | unsigned int idx = genpdspec->args[0]; | |
2101 | ||
2102 | if (genpdspec->args_count != 1) | |
2103 | return ERR_PTR(-EINVAL); | |
2104 | ||
2105 | if (idx >= genpd_data->num_domains) { | |
2106 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2107 | return ERR_PTR(-EINVAL); | |
2108 | } | |
2109 | ||
2110 | if (!genpd_data->domains[idx]) | |
2111 | return ERR_PTR(-ENOENT); | |
2112 | ||
2113 | return genpd_data->domains[idx]; | |
2114 | } | |
aa42240a TF |
2115 | |
2116 | /** | |
892ebdcc | 2117 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
2118 | * @np: Device node pointer associated with the PM domain provider. |
2119 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2120 | * @data: Context pointer for @xlate callback. | |
2121 | */ | |
892ebdcc JH |
2122 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2123 | void *data) | |
aa42240a TF |
2124 | { |
2125 | struct of_genpd_provider *cp; | |
2126 | ||
2127 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2128 | if (!cp) | |
2129 | return -ENOMEM; | |
2130 | ||
2131 | cp->node = of_node_get(np); | |
2132 | cp->data = data; | |
2133 | cp->xlate = xlate; | |
2134 | ||
2135 | mutex_lock(&of_genpd_mutex); | |
2136 | list_add(&cp->link, &of_genpd_providers); | |
2137 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2138 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2139 | |
2140 | return 0; | |
2141 | } | |
892ebdcc | 2142 | |
fe0c2baa UH |
2143 | static bool genpd_present(const struct generic_pm_domain *genpd) |
2144 | { | |
2145 | const struct generic_pm_domain *gpd; | |
2146 | ||
2147 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
2148 | if (gpd == genpd) | |
2149 | return true; | |
2150 | return false; | |
2151 | } | |
2152 | ||
892ebdcc JH |
2153 | /** |
2154 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2155 | * @np: Device node pointer associated with the PM domain provider. | |
2156 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2157 | */ | |
2158 | int of_genpd_add_provider_simple(struct device_node *np, | |
2159 | struct generic_pm_domain *genpd) | |
2160 | { | |
0159ec67 JH |
2161 | int ret = -EINVAL; |
2162 | ||
2163 | if (!np || !genpd) | |
2164 | return -EINVAL; | |
2165 | ||
2166 | mutex_lock(&gpd_list_lock); | |
2167 | ||
6a0ae73d VK |
2168 | if (!genpd_present(genpd)) |
2169 | goto unlock; | |
2170 | ||
2171 | genpd->dev.of_node = np; | |
2172 | ||
2173 | /* Parse genpd OPP table */ | |
2174 | if (genpd->set_performance_state) { | |
2175 | ret = dev_pm_opp_of_add_table(&genpd->dev); | |
2176 | if (ret) { | |
dd461cd9 SG |
2177 | if (ret != -EPROBE_DEFER) |
2178 | dev_err(&genpd->dev, "Failed to add OPP table: %d\n", | |
2179 | ret); | |
6a0ae73d | 2180 | goto unlock; |
8ce95844 | 2181 | } |
1067ae3e VK |
2182 | |
2183 | /* | |
2184 | * Save table for faster processing while setting performance | |
2185 | * state. | |
2186 | */ | |
2187 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
dd461cd9 | 2188 | WARN_ON(IS_ERR(genpd->opp_table)); |
de0aa06d JH |
2189 | } |
2190 | ||
6a0ae73d VK |
2191 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2192 | if (ret) { | |
1067ae3e VK |
2193 | if (genpd->set_performance_state) { |
2194 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2195 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2196 | } |
6a0ae73d VK |
2197 | |
2198 | goto unlock; | |
2199 | } | |
2200 | ||
2201 | genpd->provider = &np->fwnode; | |
2202 | genpd->has_provider = true; | |
2203 | ||
2204 | unlock: | |
0159ec67 JH |
2205 | mutex_unlock(&gpd_list_lock); |
2206 | ||
2207 | return ret; | |
892ebdcc JH |
2208 | } |
2209 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2210 | ||
2211 | /** | |
2212 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2213 | * @np: Device node pointer associated with the PM domain provider. | |
2214 | * @data: Pointer to the data associated with the PM domain provider. | |
2215 | */ | |
2216 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2217 | struct genpd_onecell_data *data) | |
2218 | { | |
6a0ae73d | 2219 | struct generic_pm_domain *genpd; |
0159ec67 | 2220 | unsigned int i; |
de0aa06d | 2221 | int ret = -EINVAL; |
0159ec67 JH |
2222 | |
2223 | if (!np || !data) | |
2224 | return -EINVAL; | |
2225 | ||
2226 | mutex_lock(&gpd_list_lock); | |
2227 | ||
40845524 TR |
2228 | if (!data->xlate) |
2229 | data->xlate = genpd_xlate_onecell; | |
2230 | ||
0159ec67 | 2231 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2232 | genpd = data->domains[i]; |
2233 | ||
2234 | if (!genpd) | |
609bed67 | 2235 | continue; |
6a0ae73d | 2236 | if (!genpd_present(genpd)) |
de0aa06d JH |
2237 | goto error; |
2238 | ||
6a0ae73d VK |
2239 | genpd->dev.of_node = np; |
2240 | ||
2241 | /* Parse genpd OPP table */ | |
2242 | if (genpd->set_performance_state) { | |
2243 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); | |
2244 | if (ret) { | |
dd461cd9 SG |
2245 | if (ret != -EPROBE_DEFER) |
2246 | dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n", | |
2247 | i, ret); | |
6a0ae73d VK |
2248 | goto error; |
2249 | } | |
1067ae3e VK |
2250 | |
2251 | /* | |
2252 | * Save table for faster processing while setting | |
2253 | * performance state. | |
2254 | */ | |
2255 | genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i); | |
dd461cd9 | 2256 | WARN_ON(IS_ERR(genpd->opp_table)); |
6a0ae73d VK |
2257 | } |
2258 | ||
2259 | genpd->provider = &np->fwnode; | |
2260 | genpd->has_provider = true; | |
0159ec67 JH |
2261 | } |
2262 | ||
40845524 | 2263 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2264 | if (ret < 0) |
2265 | goto error; | |
2266 | ||
2267 | mutex_unlock(&gpd_list_lock); | |
2268 | ||
2269 | return 0; | |
2270 | ||
2271 | error: | |
2272 | while (i--) { | |
6a0ae73d VK |
2273 | genpd = data->domains[i]; |
2274 | ||
2275 | if (!genpd) | |
609bed67 | 2276 | continue; |
6a0ae73d VK |
2277 | |
2278 | genpd->provider = NULL; | |
2279 | genpd->has_provider = false; | |
2280 | ||
1067ae3e VK |
2281 | if (genpd->set_performance_state) { |
2282 | dev_pm_opp_put_opp_table(genpd->opp_table); | |
6a0ae73d | 2283 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2284 | } |
de0aa06d | 2285 | } |
0159ec67 JH |
2286 | |
2287 | mutex_unlock(&gpd_list_lock); | |
2288 | ||
2289 | return ret; | |
892ebdcc JH |
2290 | } |
2291 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2292 | |
2293 | /** | |
2294 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2295 | * @np: Device node pointer associated with the PM domain provider | |
2296 | */ | |
2297 | void of_genpd_del_provider(struct device_node *np) | |
2298 | { | |
b556b15d | 2299 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2300 | struct generic_pm_domain *gpd; |
aa42240a | 2301 | |
de0aa06d | 2302 | mutex_lock(&gpd_list_lock); |
aa42240a | 2303 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2304 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2305 | if (cp->node == np) { |
de0aa06d JH |
2306 | /* |
2307 | * For each PM domain associated with the | |
2308 | * provider, set the 'has_provider' to false | |
2309 | * so that the PM domain can be safely removed. | |
2310 | */ | |
6a0ae73d VK |
2311 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2312 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2313 | gpd->has_provider = false; |
2314 | ||
6a0ae73d VK |
2315 | if (!gpd->set_performance_state) |
2316 | continue; | |
2317 | ||
1067ae3e | 2318 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2319 | dev_pm_opp_of_remove_table(&gpd->dev); |
2320 | } | |
2321 | } | |
2322 | ||
aa42240a TF |
2323 | list_del(&cp->link); |
2324 | of_node_put(cp->node); | |
2325 | kfree(cp); | |
2326 | break; | |
2327 | } | |
2328 | } | |
2329 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2330 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2331 | } |
2332 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2333 | ||
2334 | /** | |
f58d4e5a | 2335 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2336 | * @genpdspec: OF phandle args to use for look-up |
2337 | * | |
2338 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2339 | * found, uses xlate function of the provider to map phandle args to a PM | |
2340 | * domain. | |
2341 | * | |
2342 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2343 | * on failure. | |
2344 | */ | |
f58d4e5a | 2345 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2346 | struct of_phandle_args *genpdspec) |
2347 | { | |
2348 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2349 | struct of_genpd_provider *provider; | |
2350 | ||
41795a8a JH |
2351 | if (!genpdspec) |
2352 | return ERR_PTR(-EINVAL); | |
2353 | ||
aa42240a TF |
2354 | mutex_lock(&of_genpd_mutex); |
2355 | ||
2356 | /* Check if we have such a provider in our array */ | |
2357 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2358 | if (provider->node == genpdspec->np) | |
2359 | genpd = provider->xlate(genpdspec, provider->data); | |
2360 | if (!IS_ERR(genpd)) | |
2361 | break; | |
2362 | } | |
2363 | ||
2364 | mutex_unlock(&of_genpd_mutex); | |
2365 | ||
2366 | return genpd; | |
2367 | } | |
2368 | ||
ec69572b JH |
2369 | /** |
2370 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2371 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2372 | * @dev: Device to be added. | |
2373 | * | |
2374 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2375 | * the device to the PM domain. Returns a negative error code on failure. | |
2376 | */ | |
2377 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2378 | { | |
2379 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2380 | int ret; |
2381 | ||
2382 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2383 | |
f58d4e5a | 2384 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2385 | if (IS_ERR(genpd)) { |
2386 | ret = PTR_ERR(genpd); | |
2387 | goto out; | |
2388 | } | |
2389 | ||
f9ccd7c3 | 2390 | ret = genpd_add_device(genpd, dev, dev); |
ec69572b | 2391 | |
19efa5ff JH |
2392 | out: |
2393 | mutex_unlock(&gpd_list_lock); | |
2394 | ||
2395 | return ret; | |
ec69572b JH |
2396 | } |
2397 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2398 | ||
2399 | /** | |
2400 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2401 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2402 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2403 | * | |
2404 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2405 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2406 | * negative error code on failure. | |
2407 | */ | |
2408 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2409 | struct of_phandle_args *subdomain_spec) | |
2410 | { | |
2411 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2412 | int ret; |
2413 | ||
2414 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2415 | |
f58d4e5a | 2416 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2417 | if (IS_ERR(parent)) { |
2418 | ret = PTR_ERR(parent); | |
2419 | goto out; | |
2420 | } | |
ec69572b | 2421 | |
f58d4e5a | 2422 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2423 | if (IS_ERR(subdomain)) { |
2424 | ret = PTR_ERR(subdomain); | |
2425 | goto out; | |
2426 | } | |
2427 | ||
2428 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2429 | |
19efa5ff JH |
2430 | out: |
2431 | mutex_unlock(&gpd_list_lock); | |
2432 | ||
2433 | return ret; | |
ec69572b JH |
2434 | } |
2435 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2436 | ||
dedd1492 UH |
2437 | /** |
2438 | * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
2439 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2440 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2441 | * | |
2442 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2443 | * provided and removes the subdomain from the parent PM domain. Returns a | |
2444 | * negative error code on failure. | |
2445 | */ | |
2446 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, | |
2447 | struct of_phandle_args *subdomain_spec) | |
2448 | { | |
2449 | struct generic_pm_domain *parent, *subdomain; | |
2450 | int ret; | |
2451 | ||
2452 | mutex_lock(&gpd_list_lock); | |
2453 | ||
2454 | parent = genpd_get_from_provider(parent_spec); | |
2455 | if (IS_ERR(parent)) { | |
2456 | ret = PTR_ERR(parent); | |
2457 | goto out; | |
2458 | } | |
2459 | ||
2460 | subdomain = genpd_get_from_provider(subdomain_spec); | |
2461 | if (IS_ERR(subdomain)) { | |
2462 | ret = PTR_ERR(subdomain); | |
2463 | goto out; | |
2464 | } | |
2465 | ||
2466 | ret = pm_genpd_remove_subdomain(parent, subdomain); | |
2467 | ||
2468 | out: | |
2469 | mutex_unlock(&gpd_list_lock); | |
2470 | ||
2471 | return ret; | |
2472 | } | |
2473 | EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); | |
2474 | ||
17926551 JH |
2475 | /** |
2476 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
2477 | * @provider: Pointer to device structure associated with provider | |
2478 | * | |
2479 | * Find the last PM domain that was added by a particular provider and | |
2480 | * remove this PM domain from the list of PM domains. The provider is | |
2481 | * identified by the 'provider' device structure that is passed. The PM | |
2482 | * domain will only be removed, if the provider associated with domain | |
2483 | * has been removed. | |
2484 | * | |
2485 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2486 | * ERR_PTR() on failure. | |
2487 | */ | |
2488 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2489 | { | |
a7e2d1bc | 2490 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2491 | int ret; |
2492 | ||
2493 | if (IS_ERR_OR_NULL(np)) | |
2494 | return ERR_PTR(-EINVAL); | |
2495 | ||
2496 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2497 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2498 | if (gpd->provider == &np->fwnode) { |
2499 | ret = genpd_remove(gpd); | |
2500 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2501 | break; | |
2502 | } | |
2503 | } | |
2504 | mutex_unlock(&gpd_list_lock); | |
2505 | ||
2506 | return genpd; | |
2507 | } | |
2508 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2509 | ||
3c095f32 UH |
2510 | static void genpd_release_dev(struct device *dev) |
2511 | { | |
e8b04de9 | 2512 | of_node_put(dev->of_node); |
3c095f32 UH |
2513 | kfree(dev); |
2514 | } | |
2515 | ||
2516 | static struct bus_type genpd_bus_type = { | |
2517 | .name = "genpd", | |
2518 | }; | |
2519 | ||
aa42240a TF |
2520 | /** |
2521 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2522 | * @dev: Device to detach. |
aa42240a TF |
2523 | * @power_off: Currently not used |
2524 | * | |
2525 | * Try to locate a corresponding generic PM domain, which the device was | |
2526 | * attached to previously. If such is found, the device is detached from it. | |
2527 | */ | |
2528 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2529 | { | |
446d999c | 2530 | struct generic_pm_domain *pd; |
93af5e93 | 2531 | unsigned int i; |
aa42240a TF |
2532 | int ret = 0; |
2533 | ||
85168d56 UH |
2534 | pd = dev_to_genpd(dev); |
2535 | if (IS_ERR(pd)) | |
aa42240a TF |
2536 | return; |
2537 | ||
2538 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2539 | ||
93af5e93 | 2540 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2541 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2542 | if (ret != -EAGAIN) |
2543 | break; | |
93af5e93 GU |
2544 | |
2545 | mdelay(i); | |
aa42240a TF |
2546 | cond_resched(); |
2547 | } | |
2548 | ||
2549 | if (ret < 0) { | |
2550 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2551 | pd->name, ret); | |
2552 | return; | |
2553 | } | |
2554 | ||
2555 | /* Check if PM domain can be powered off after removing this device. */ | |
2556 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2557 | |
2558 | /* Unregister the device if it was created by genpd. */ | |
2559 | if (dev->bus == &genpd_bus_type) | |
2560 | device_unregister(dev); | |
aa42240a TF |
2561 | } |
2562 | ||
632f7ce3 RK |
2563 | static void genpd_dev_pm_sync(struct device *dev) |
2564 | { | |
2565 | struct generic_pm_domain *pd; | |
2566 | ||
2567 | pd = dev_to_genpd(dev); | |
2568 | if (IS_ERR(pd)) | |
2569 | return; | |
2570 | ||
2571 | genpd_queue_power_off_work(pd); | |
2572 | } | |
2573 | ||
51dcf748 UH |
2574 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2575 | unsigned int index, bool power_on) | |
aa42240a TF |
2576 | { |
2577 | struct of_phandle_args pd_args; | |
2578 | struct generic_pm_domain *pd; | |
2579 | int ret; | |
2580 | ||
e8b04de9 | 2581 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2582 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2583 | if (ret < 0) |
bcd931f2 | 2584 | return ret; |
aa42240a | 2585 | |
19efa5ff | 2586 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2587 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2588 | of_node_put(pd_args.np); |
aa42240a | 2589 | if (IS_ERR(pd)) { |
19efa5ff | 2590 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2591 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2592 | __func__, PTR_ERR(pd)); | |
51dcf748 | 2593 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2594 | } |
2595 | ||
2596 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2597 | ||
f9ccd7c3 | 2598 | ret = genpd_add_device(pd, dev, base_dev); |
19efa5ff | 2599 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2600 | |
2601 | if (ret < 0) { | |
34994692 GU |
2602 | if (ret != -EPROBE_DEFER) |
2603 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2604 | pd->name, ret); | |
919b7308 | 2605 | return ret; |
aa42240a TF |
2606 | } |
2607 | ||
2608 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2609 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2610 | |
895b6612 UH |
2611 | if (power_on) { |
2612 | genpd_lock(pd); | |
2613 | ret = genpd_power_on(pd, 0); | |
2614 | genpd_unlock(pd); | |
2615 | } | |
72038df3 UH |
2616 | |
2617 | if (ret) | |
2618 | genpd_remove_device(pd, dev); | |
919b7308 UH |
2619 | |
2620 | return ret ? -EPROBE_DEFER : 1; | |
aa42240a | 2621 | } |
8cb1cbd6 UH |
2622 | |
2623 | /** | |
2624 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2625 | * @dev: Device to attach. | |
2626 | * | |
2627 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2628 | * attaches the device to retrieved pm_domain ops. | |
2629 | * | |
2630 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2631 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2632 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2633 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2634 | * not probed and to re-try again later. | |
2635 | */ | |
2636 | int genpd_dev_pm_attach(struct device *dev) | |
2637 | { | |
2638 | if (!dev->of_node) | |
2639 | return 0; | |
2640 | ||
2641 | /* | |
2642 | * Devices with multiple PM domains must be attached separately, as we | |
2643 | * can only attach one PM domain per device. | |
2644 | */ | |
2645 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2646 | "#power-domain-cells") != 1) | |
2647 | return 0; | |
2648 | ||
51dcf748 | 2649 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2650 | } |
aa42240a | 2651 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2652 | |
3c095f32 UH |
2653 | /** |
2654 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2655 | * @dev: The device used to lookup the PM domain. | |
2656 | * @index: The index of the PM domain. | |
2657 | * | |
2658 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2659 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2660 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2661 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2662 | * | |
2663 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2664 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2665 | * failures. If a power-domain exists for the device, but cannot be found or | |
2666 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2667 | * is not probed and to re-try again later. | |
2668 | */ | |
2669 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2670 | unsigned int index) | |
2671 | { | |
560928b2 | 2672 | struct device *virt_dev; |
3c095f32 UH |
2673 | int num_domains; |
2674 | int ret; | |
2675 | ||
2676 | if (!dev->of_node) | |
2677 | return NULL; | |
2678 | ||
3ccf3f0c | 2679 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2680 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2681 | "#power-domain-cells"); | |
3ccf3f0c | 2682 | if (index >= num_domains) |
3c095f32 UH |
2683 | return NULL; |
2684 | ||
2685 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2686 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2687 | if (!virt_dev) | |
3c095f32 UH |
2688 | return ERR_PTR(-ENOMEM); |
2689 | ||
560928b2 VK |
2690 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2691 | virt_dev->bus = &genpd_bus_type; | |
2692 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2693 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2694 | |
560928b2 | 2695 | ret = device_register(virt_dev); |
3c095f32 | 2696 | if (ret) { |
71b77697 | 2697 | put_device(virt_dev); |
3c095f32 UH |
2698 | return ERR_PTR(ret); |
2699 | } | |
2700 | ||
2701 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2702 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2703 | if (ret < 1) { |
560928b2 | 2704 | device_unregister(virt_dev); |
3c095f32 UH |
2705 | return ret ? ERR_PTR(ret) : NULL; |
2706 | } | |
2707 | ||
560928b2 VK |
2708 | pm_runtime_enable(virt_dev); |
2709 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2710 | |
560928b2 | 2711 | return virt_dev; |
3c095f32 UH |
2712 | } |
2713 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2714 | ||
5d6be70a UH |
2715 | /** |
2716 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2717 | * @dev: The device used to lookup the PM domain. | |
2718 | * @name: The name of the PM domain. | |
2719 | * | |
2720 | * Parse device's OF node to find a PM domain specifier using the | |
2721 | * power-domain-names DT property. For further description see | |
2722 | * genpd_dev_pm_attach_by_id(). | |
2723 | */ | |
7416f1f2 | 2724 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2725 | { |
2726 | int index; | |
2727 | ||
2728 | if (!dev->of_node) | |
2729 | return NULL; | |
2730 | ||
2731 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2732 | name); | |
2733 | if (index < 0) | |
2734 | return NULL; | |
2735 | ||
2736 | return genpd_dev_pm_attach_by_id(dev, index); | |
2737 | } | |
2738 | ||
30f60428 | 2739 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2740 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2741 | { } |
2742 | }; | |
2743 | ||
2744 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2745 | struct device_node *state_node) | |
2746 | { | |
2747 | int err; | |
2748 | u32 residency; | |
2749 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2750 | |
2751 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2752 | &entry_latency); | |
2753 | if (err) { | |
ea11e94b | 2754 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2755 | state_node); |
30f60428 LI |
2756 | return -EINVAL; |
2757 | } | |
2758 | ||
2759 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2760 | &exit_latency); | |
2761 | if (err) { | |
ea11e94b | 2762 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2763 | state_node); |
30f60428 LI |
2764 | return -EINVAL; |
2765 | } | |
2766 | ||
2767 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2768 | if (!err) | |
2769 | genpd_state->residency_ns = 1000 * residency; | |
2770 | ||
2771 | genpd_state->power_on_latency_ns = 1000 * exit_latency; | |
2772 | genpd_state->power_off_latency_ns = 1000 * entry_latency; | |
0c9b694a | 2773 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2774 | |
2775 | return 0; | |
2776 | } | |
2777 | ||
a3381e3a UH |
2778 | static int genpd_iterate_idle_states(struct device_node *dn, |
2779 | struct genpd_power_state *states) | |
2780 | { | |
2781 | int ret; | |
2782 | struct of_phandle_iterator it; | |
2783 | struct device_node *np; | |
2784 | int i = 0; | |
2785 | ||
2786 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2787 | if (ret <= 0) | |
56cb2689 | 2788 | return ret == -ENOENT ? 0 : ret; |
a3381e3a UH |
2789 | |
2790 | /* Loop over the phandles until all the requested entry is found */ | |
2791 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2792 | np = it.node; | |
2793 | if (!of_match_node(idle_state_match, np)) | |
2794 | continue; | |
2795 | if (states) { | |
2796 | ret = genpd_parse_state(&states[i], np); | |
2797 | if (ret) { | |
2798 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2799 | np, ret); | |
2800 | of_node_put(np); | |
2801 | return ret; | |
2802 | } | |
2803 | } | |
2804 | i++; | |
2805 | } | |
2806 | ||
2807 | return i; | |
2808 | } | |
2809 | ||
30f60428 LI |
2810 | /** |
2811 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
2812 | * | |
2813 | * @dn: The genpd device node | |
2814 | * @states: The pointer to which the state array will be saved. | |
2815 | * @n: The count of elements in the array returned from this function. | |
2816 | * | |
2817 | * Returns the device states parsed from the OF node. The memory for the states | |
2818 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
2819 | * free the memory after use. If any or zero compatible domain idle states is |
2820 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
2821 | */ |
2822 | int of_genpd_parse_idle_states(struct device_node *dn, | |
2823 | struct genpd_power_state **states, int *n) | |
2824 | { | |
2825 | struct genpd_power_state *st; | |
a3381e3a | 2826 | int ret; |
30f60428 | 2827 | |
a3381e3a | 2828 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
2829 | if (ret < 0) |
2830 | return ret; | |
2831 | ||
2832 | if (!ret) { | |
2833 | *states = NULL; | |
2834 | *n = 0; | |
2835 | return 0; | |
2836 | } | |
30f60428 | 2837 | |
a3381e3a | 2838 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
2839 | if (!st) |
2840 | return -ENOMEM; | |
2841 | ||
a3381e3a UH |
2842 | ret = genpd_iterate_idle_states(dn, st); |
2843 | if (ret <= 0) { | |
2844 | kfree(st); | |
2845 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
2846 | } |
2847 | ||
a3381e3a UH |
2848 | *states = st; |
2849 | *n = ret; | |
30f60428 LI |
2850 | |
2851 | return 0; | |
2852 | } | |
2853 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
2854 | ||
e38f89d3 VK |
2855 | /** |
2856 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. | |
2857 | * | |
2858 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. | |
2859 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance | |
2860 | * state. | |
2861 | * | |
2862 | * Returns performance state encoded in the OPP of the genpd. This calls | |
2863 | * platform specific genpd->opp_to_performance_state() callback to translate | |
2864 | * power domain OPP to performance state. | |
2865 | * | |
2866 | * Returns performance state on success and 0 on failure. | |
2867 | */ | |
2868 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, | |
2869 | struct dev_pm_opp *opp) | |
2870 | { | |
2871 | struct generic_pm_domain *genpd = NULL; | |
2872 | int state; | |
2873 | ||
2874 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); | |
2875 | ||
2876 | if (unlikely(!genpd->opp_to_performance_state)) | |
2877 | return 0; | |
2878 | ||
2879 | genpd_lock(genpd); | |
2880 | state = genpd->opp_to_performance_state(genpd, opp); | |
2881 | genpd_unlock(genpd); | |
2882 | ||
2883 | return state; | |
2884 | } | |
2885 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); | |
2886 | ||
3c095f32 UH |
2887 | static int __init genpd_bus_init(void) |
2888 | { | |
2889 | return bus_register(&genpd_bus_type); | |
2890 | } | |
2891 | core_initcall(genpd_bus_init); | |
2892 | ||
d30d819d | 2893 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2894 | |
2895 | ||
2896 | /*** debugfs support ***/ | |
2897 | ||
8b0510b5 | 2898 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
2899 | #include <linux/pm.h> |
2900 | #include <linux/device.h> | |
2901 | #include <linux/debugfs.h> | |
2902 | #include <linux/seq_file.h> | |
2903 | #include <linux/init.h> | |
2904 | #include <linux/kobject.h> | |
9e9704ea | 2905 | static struct dentry *genpd_debugfs_dir; |
2bd5306a MM |
2906 | |
2907 | /* | |
2908 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2909 | * from sysfs.c, so generalize it. |
2bd5306a | 2910 | */ |
2bd5306a MM |
2911 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2912 | { | |
2913 | static const char * const status_lookup[] = { | |
2914 | [RPM_ACTIVE] = "active", | |
2915 | [RPM_RESUMING] = "resuming", | |
2916 | [RPM_SUSPENDED] = "suspended", | |
2917 | [RPM_SUSPENDING] = "suspending" | |
2918 | }; | |
2919 | const char *p = ""; | |
2920 | ||
2921 | if (dev->power.runtime_error) | |
2922 | p = "error"; | |
2923 | else if (dev->power.disable_depth) | |
2924 | p = "unsupported"; | |
2925 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2926 | p = status_lookup[dev->power.runtime_status]; | |
2927 | else | |
2928 | WARN_ON(1); | |
2929 | ||
2930 | seq_puts(s, p); | |
2931 | } | |
2bd5306a | 2932 | |
9e9704ea UH |
2933 | static int genpd_summary_one(struct seq_file *s, |
2934 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
2935 | { |
2936 | static const char * const status_lookup[] = { | |
49f618e1 UH |
2937 | [GENPD_STATE_ON] = "on", |
2938 | [GENPD_STATE_OFF] = "off" | |
2bd5306a MM |
2939 | }; |
2940 | struct pm_domain_data *pm_data; | |
2941 | const char *kobj_path; | |
2942 | struct gpd_link *link; | |
6954d432 | 2943 | char state[16]; |
2bd5306a MM |
2944 | int ret; |
2945 | ||
35241d12 | 2946 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
2947 | if (ret) |
2948 | return -ERESTARTSYS; | |
2949 | ||
66a5ca4b | 2950 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2951 | goto exit; |
41e2c8e0 | 2952 | if (!genpd_status_on(genpd)) |
0ba554e4 | 2953 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 2954 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 2955 | else |
6954d432 GU |
2956 | snprintf(state, sizeof(state), "%s", |
2957 | status_lookup[genpd->status]); | |
2958 | seq_printf(s, "%-30s %-15s ", genpd->name, state); | |
2bd5306a MM |
2959 | |
2960 | /* | |
2961 | * Modifications on the list require holding locks on both | |
8d87ae48 | 2962 | * parent and child, so we are safe. |
66a5ca4b | 2963 | * Also genpd->name is immutable. |
2bd5306a | 2964 | */ |
8d87ae48 KC |
2965 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
2966 | seq_printf(s, "%s", link->child->name); | |
2967 | if (!list_is_last(&link->parent_node, &genpd->parent_links)) | |
2bd5306a MM |
2968 | seq_puts(s, ", "); |
2969 | } | |
2970 | ||
66a5ca4b | 2971 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
2972 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
2973 | genpd_is_irq_safe(genpd) ? | |
2974 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
2975 | if (kobj_path == NULL) |
2976 | continue; | |
2977 | ||
2978 | seq_printf(s, "\n %-50s ", kobj_path); | |
2979 | rtpm_status_str(s, pm_data->dev); | |
2980 | kfree(kobj_path); | |
2981 | } | |
2982 | ||
2983 | seq_puts(s, "\n"); | |
2984 | exit: | |
35241d12 | 2985 | genpd_unlock(genpd); |
2bd5306a MM |
2986 | |
2987 | return 0; | |
2988 | } | |
2989 | ||
d32dcc6c | 2990 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 2991 | { |
66a5ca4b | 2992 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2993 | int ret = 0; |
2994 | ||
8d87ae48 | 2995 | seq_puts(s, "domain status children\n"); |
15dec67a | 2996 | seq_puts(s, " /device runtime status\n"); |
2bd5306a MM |
2997 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2998 | ||
2999 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
3000 | if (ret) | |
3001 | return -ERESTARTSYS; | |
3002 | ||
66a5ca4b | 3003 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3004 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
3005 | if (ret) |
3006 | break; | |
3007 | } | |
3008 | mutex_unlock(&gpd_list_lock); | |
3009 | ||
3010 | return ret; | |
3011 | } | |
3012 | ||
d32dcc6c | 3013 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 3014 | { |
b6a1d093 | 3015 | static const char * const status_lookup[] = { |
49f618e1 UH |
3016 | [GENPD_STATE_ON] = "on", |
3017 | [GENPD_STATE_OFF] = "off" | |
b6a1d093 TG |
3018 | }; |
3019 | ||
3020 | struct generic_pm_domain *genpd = s->private; | |
3021 | int ret = 0; | |
3022 | ||
3023 | ret = genpd_lock_interruptible(genpd); | |
3024 | if (ret) | |
3025 | return -ERESTARTSYS; | |
3026 | ||
3027 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
3028 | goto exit; | |
3029 | ||
49f618e1 | 3030 | if (genpd->status == GENPD_STATE_OFF) |
b6a1d093 TG |
3031 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
3032 | genpd->state_idx); | |
3033 | else | |
3034 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
3035 | exit: | |
3036 | genpd_unlock(genpd); | |
3037 | return ret; | |
2bd5306a MM |
3038 | } |
3039 | ||
d32dcc6c | 3040 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3041 | { |
3042 | struct generic_pm_domain *genpd = s->private; | |
3043 | struct gpd_link *link; | |
3044 | int ret = 0; | |
3045 | ||
3046 | ret = genpd_lock_interruptible(genpd); | |
3047 | if (ret) | |
3048 | return -ERESTARTSYS; | |
3049 | ||
8d87ae48 KC |
3050 | list_for_each_entry(link, &genpd->parent_links, parent_node) |
3051 | seq_printf(s, "%s\n", link->child->name); | |
b6a1d093 TG |
3052 | |
3053 | genpd_unlock(genpd); | |
3054 | return ret; | |
3055 | } | |
3056 | ||
d32dcc6c | 3057 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3058 | { |
3059 | struct generic_pm_domain *genpd = s->private; | |
3060 | unsigned int i; | |
3061 | int ret = 0; | |
3062 | ||
3063 | ret = genpd_lock_interruptible(genpd); | |
3064 | if (ret) | |
3065 | return -ERESTARTSYS; | |
3066 | ||
c6a113b5 | 3067 | seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
b6a1d093 TG |
3068 | |
3069 | for (i = 0; i < genpd->state_count; i++) { | |
3070 | ktime_t delta = 0; | |
3071 | s64 msecs; | |
3072 | ||
49f618e1 | 3073 | if ((genpd->status == GENPD_STATE_OFF) && |
b6a1d093 TG |
3074 | (genpd->state_idx == i)) |
3075 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
3076 | ||
3077 | msecs = ktime_to_ms( | |
3078 | ktime_add(genpd->states[i].idle_time, delta)); | |
c6a113b5 LI |
3079 | seq_printf(s, "S%-13i %-14lld %-14llu %llu\n", i, msecs, |
3080 | genpd->states[i].usage, genpd->states[i].rejected); | |
b6a1d093 TG |
3081 | } |
3082 | ||
3083 | genpd_unlock(genpd); | |
3084 | return ret; | |
3085 | } | |
3086 | ||
d32dcc6c | 3087 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3088 | { |
3089 | struct generic_pm_domain *genpd = s->private; | |
3090 | ktime_t delta = 0; | |
3091 | int ret = 0; | |
3092 | ||
3093 | ret = genpd_lock_interruptible(genpd); | |
3094 | if (ret) | |
3095 | return -ERESTARTSYS; | |
3096 | ||
49f618e1 | 3097 | if (genpd->status == GENPD_STATE_ON) |
b6a1d093 TG |
3098 | delta = ktime_sub(ktime_get(), genpd->accounting_time); |
3099 | ||
3100 | seq_printf(s, "%lld ms\n", ktime_to_ms( | |
3101 | ktime_add(genpd->on_time, delta))); | |
3102 | ||
3103 | genpd_unlock(genpd); | |
3104 | return ret; | |
3105 | } | |
3106 | ||
d32dcc6c | 3107 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3108 | { |
3109 | struct generic_pm_domain *genpd = s->private; | |
3110 | ktime_t delta = 0, total = 0; | |
3111 | unsigned int i; | |
3112 | int ret = 0; | |
3113 | ||
3114 | ret = genpd_lock_interruptible(genpd); | |
3115 | if (ret) | |
3116 | return -ERESTARTSYS; | |
3117 | ||
3118 | for (i = 0; i < genpd->state_count; i++) { | |
3119 | ||
49f618e1 | 3120 | if ((genpd->status == GENPD_STATE_OFF) && |
b6a1d093 TG |
3121 | (genpd->state_idx == i)) |
3122 | delta = ktime_sub(ktime_get(), genpd->accounting_time); | |
3123 | ||
3124 | total = ktime_add(total, genpd->states[i].idle_time); | |
3125 | } | |
3126 | total = ktime_add(total, delta); | |
3127 | ||
3128 | seq_printf(s, "%lld ms\n", ktime_to_ms(total)); | |
3129 | ||
3130 | genpd_unlock(genpd); | |
3131 | return ret; | |
3132 | } | |
3133 | ||
3134 | ||
d32dcc6c | 3135 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3136 | { |
3137 | struct generic_pm_domain *genpd = s->private; | |
3138 | struct pm_domain_data *pm_data; | |
3139 | const char *kobj_path; | |
3140 | int ret = 0; | |
3141 | ||
3142 | ret = genpd_lock_interruptible(genpd); | |
3143 | if (ret) | |
3144 | return -ERESTARTSYS; | |
3145 | ||
3146 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
3147 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
3148 | genpd_is_irq_safe(genpd) ? | |
3149 | GFP_ATOMIC : GFP_KERNEL); | |
3150 | if (kobj_path == NULL) | |
3151 | continue; | |
3152 | ||
3153 | seq_printf(s, "%s\n", kobj_path); | |
3154 | kfree(kobj_path); | |
3155 | } | |
3156 | ||
3157 | genpd_unlock(genpd); | |
3158 | return ret; | |
3159 | } | |
3160 | ||
d32dcc6c | 3161 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
3162 | { |
3163 | struct generic_pm_domain *genpd = s->private; | |
3164 | ||
3165 | if (genpd_lock_interruptible(genpd)) | |
3166 | return -ERESTARTSYS; | |
3167 | ||
3168 | seq_printf(s, "%u\n", genpd->performance_state); | |
3169 | ||
3170 | genpd_unlock(genpd); | |
3171 | return 0; | |
3172 | } | |
3173 | ||
d32dcc6c YL |
3174 | DEFINE_SHOW_ATTRIBUTE(summary); |
3175 | DEFINE_SHOW_ATTRIBUTE(status); | |
3176 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3177 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3178 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3179 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3180 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3181 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3182 | |
9e9704ea | 3183 | static int __init genpd_debug_init(void) |
2bd5306a MM |
3184 | { |
3185 | struct dentry *d; | |
b6a1d093 | 3186 | struct generic_pm_domain *genpd; |
2bd5306a | 3187 | |
9e9704ea | 3188 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3189 | |
e16a42c3 GKH |
3190 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3191 | NULL, &summary_fops); | |
2bd5306a | 3192 | |
b6a1d093 | 3193 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3194 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
b6a1d093 TG |
3195 | |
3196 | debugfs_create_file("current_state", 0444, | |
d32dcc6c | 3197 | d, genpd, &status_fops); |
b6a1d093 | 3198 | debugfs_create_file("sub_domains", 0444, |
d32dcc6c | 3199 | d, genpd, &sub_domains_fops); |
b6a1d093 | 3200 | debugfs_create_file("idle_states", 0444, |
d32dcc6c | 3201 | d, genpd, &idle_states_fops); |
b6a1d093 | 3202 | debugfs_create_file("active_time", 0444, |
d32dcc6c | 3203 | d, genpd, &active_time_fops); |
b6a1d093 | 3204 | debugfs_create_file("total_idle_time", 0444, |
d32dcc6c | 3205 | d, genpd, &total_idle_time_fops); |
b6a1d093 | 3206 | debugfs_create_file("devices", 0444, |
d32dcc6c | 3207 | d, genpd, &devices_fops); |
e8912812 RN |
3208 | if (genpd->set_performance_state) |
3209 | debugfs_create_file("perf_state", 0444, | |
d32dcc6c | 3210 | d, genpd, &perf_state_fops); |
b6a1d093 TG |
3211 | } |
3212 | ||
2bd5306a MM |
3213 | return 0; |
3214 | } | |
9e9704ea | 3215 | late_initcall(genpd_debug_init); |
2bd5306a | 3216 | |
9e9704ea | 3217 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3218 | { |
9e9704ea | 3219 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3220 | } |
9e9704ea | 3221 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3222 | #endif /* CONFIG_DEBUG_FS */ |