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5de363b6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f721889f RW |
2 | /* |
3 | * drivers/base/power/domain.c - Common code related to device power domains. | |
4 | * | |
5 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
f721889f | 6 | */ |
7a5bd127 JP |
7 | #define pr_fmt(fmt) "PM: " fmt |
8 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
6a0ae73d | 13 | #include <linux/pm_opp.h> |
f721889f RW |
14 | #include <linux/pm_runtime.h> |
15 | #include <linux/pm_domain.h> | |
6ff7bb0d | 16 | #include <linux/pm_qos.h> |
c11f6f5b | 17 | #include <linux/pm_clock.h> |
f721889f RW |
18 | #include <linux/slab.h> |
19 | #include <linux/err.h> | |
17b75eca RW |
20 | #include <linux/sched.h> |
21 | #include <linux/suspend.h> | |
d5e4cbfe | 22 | #include <linux/export.h> |
eb594b73 | 23 | #include <linux/cpu.h> |
718072ce | 24 | #include <linux/debugfs.h> |
d5e4cbfe | 25 | |
93af5e93 GU |
26 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
27 | ||
d5e4cbfe RW |
28 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
29 | ({ \ | |
30 | type (*__routine)(struct device *__d); \ | |
31 | type __ret = (type)0; \ | |
32 | \ | |
33 | __routine = genpd->dev_ops.callback; \ | |
34 | if (__routine) { \ | |
35 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
36 | } \ |
37 | __ret; \ | |
38 | }) | |
f721889f | 39 | |
5125bbf3 RW |
40 | static LIST_HEAD(gpd_list); |
41 | static DEFINE_MUTEX(gpd_list_lock); | |
42 | ||
35241d12 LI |
43 | struct genpd_lock_ops { |
44 | void (*lock)(struct generic_pm_domain *genpd); | |
45 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); | |
46 | int (*lock_interruptible)(struct generic_pm_domain *genpd); | |
47 | void (*unlock)(struct generic_pm_domain *genpd); | |
48 | }; | |
49 | ||
50 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) | |
51 | { | |
52 | mutex_lock(&genpd->mlock); | |
53 | } | |
54 | ||
55 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, | |
56 | int depth) | |
57 | { | |
58 | mutex_lock_nested(&genpd->mlock, depth); | |
59 | } | |
60 | ||
61 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) | |
62 | { | |
63 | return mutex_lock_interruptible(&genpd->mlock); | |
64 | } | |
65 | ||
66 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) | |
67 | { | |
68 | return mutex_unlock(&genpd->mlock); | |
69 | } | |
70 | ||
71 | static const struct genpd_lock_ops genpd_mtx_ops = { | |
72 | .lock = genpd_lock_mtx, | |
73 | .lock_nested = genpd_lock_nested_mtx, | |
74 | .lock_interruptible = genpd_lock_interruptible_mtx, | |
75 | .unlock = genpd_unlock_mtx, | |
76 | }; | |
77 | ||
d716f479 LI |
78 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
79 | __acquires(&genpd->slock) | |
80 | { | |
81 | unsigned long flags; | |
82 | ||
83 | spin_lock_irqsave(&genpd->slock, flags); | |
84 | genpd->lock_flags = flags; | |
85 | } | |
86 | ||
87 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, | |
88 | int depth) | |
89 | __acquires(&genpd->slock) | |
90 | { | |
91 | unsigned long flags; | |
92 | ||
93 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); | |
94 | genpd->lock_flags = flags; | |
95 | } | |
96 | ||
97 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) | |
98 | __acquires(&genpd->slock) | |
99 | { | |
100 | unsigned long flags; | |
101 | ||
102 | spin_lock_irqsave(&genpd->slock, flags); | |
103 | genpd->lock_flags = flags; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) | |
108 | __releases(&genpd->slock) | |
109 | { | |
110 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); | |
111 | } | |
112 | ||
113 | static const struct genpd_lock_ops genpd_spin_ops = { | |
114 | .lock = genpd_lock_spin, | |
115 | .lock_nested = genpd_lock_nested_spin, | |
116 | .lock_interruptible = genpd_lock_interruptible_spin, | |
117 | .unlock = genpd_unlock_spin, | |
118 | }; | |
119 | ||
35241d12 LI |
120 | #define genpd_lock(p) p->lock_ops->lock(p) |
121 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) | |
122 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) | |
123 | #define genpd_unlock(p) p->lock_ops->unlock(p) | |
124 | ||
49f618e1 | 125 | #define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) |
d716f479 | 126 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
ffaa42e8 | 127 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
95a20ef6 | 128 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
eb594b73 | 129 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
ed61e18a | 130 | #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
3dd91515 | 131 | #define genpd_is_opp_table_fw(genpd) (genpd->flags & GENPD_FLAG_OPP_TABLE_FW) |
d716f479 | 132 | |
7a02444b | 133 | static inline bool irq_safe_dev_in_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 | 140 | /* |
7a02444b UH |
141 | * Warn once if an IRQ safe device is attached to a domain, which |
142 | * callbacks are allowed to sleep. This indicates a suboptimal | |
143 | * configuration for PM, but it doesn't matter for an always on domain. | |
075c37d5 | 144 | */ |
bcc19f69 UH |
145 | if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) |
146 | return ret; | |
147 | ||
148 | if (ret) | |
d716f479 LI |
149 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
150 | genpd->name); | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
b3ad17c0 UH |
155 | static int genpd_runtime_suspend(struct device *dev); |
156 | ||
446d999c RK |
157 | /* |
158 | * Get the generic PM domain for a particular struct device. | |
159 | * This validates the struct device pointer, the PM domain pointer, | |
160 | * and checks that the PM domain pointer is a real generic PM domain. | |
161 | * Any failure results in NULL being returned. | |
162 | */ | |
b3ad17c0 | 163 | static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
446d999c | 164 | { |
446d999c RK |
165 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
166 | return NULL; | |
167 | ||
b3ad17c0 UH |
168 | /* A genpd's always have its ->runtime_suspend() callback assigned. */ |
169 | if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) | |
170 | return pd_to_genpd(dev->pm_domain); | |
446d999c | 171 | |
b3ad17c0 | 172 | return NULL; |
446d999c RK |
173 | } |
174 | ||
175 | /* | |
176 | * This should only be used where we are certain that the pm_domain | |
177 | * attached to the device is a genpd domain. | |
178 | */ | |
179 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
180 | { |
181 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
182 | return ERR_PTR(-EINVAL); | |
183 | ||
596ba34b | 184 | return pd_to_genpd(dev->pm_domain); |
5248051b | 185 | } |
f721889f | 186 | |
d8600c8b KK |
187 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
188 | struct device *dev) | |
d5e4cbfe | 189 | { |
2b1d88cd | 190 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
191 | } |
192 | ||
d8600c8b KK |
193 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
194 | struct device *dev) | |
d5e4cbfe | 195 | { |
2b1d88cd | 196 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
197 | } |
198 | ||
c4bb3160 | 199 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 200 | { |
c4bb3160 RW |
201 | bool ret = false; |
202 | ||
203 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
204 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
205 | ||
206 | return ret; | |
207 | } | |
208 | ||
209 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
210 | { | |
211 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 212 | smp_mb__after_atomic(); |
f721889f RW |
213 | } |
214 | ||
afece3ab | 215 | #ifdef CONFIG_DEBUG_FS |
718072ce TS |
216 | static struct dentry *genpd_debugfs_dir; |
217 | ||
218 | static void genpd_debug_add(struct generic_pm_domain *genpd); | |
219 | ||
220 | static void genpd_debug_remove(struct generic_pm_domain *genpd) | |
221 | { | |
37101d3c HYW |
222 | if (!genpd_debugfs_dir) |
223 | return; | |
224 | ||
0b6200e1 | 225 | debugfs_lookup_and_remove(genpd->name, genpd_debugfs_dir); |
718072ce TS |
226 | } |
227 | ||
afece3ab TG |
228 | static void genpd_update_accounting(struct generic_pm_domain *genpd) |
229 | { | |
bd40cbb0 | 230 | u64 delta, now; |
afece3ab | 231 | |
bd40cbb0 UH |
232 | now = ktime_get_mono_fast_ns(); |
233 | if (now <= genpd->accounting_time) | |
234 | return; | |
235 | ||
236 | delta = now - genpd->accounting_time; | |
afece3ab TG |
237 | |
238 | /* | |
239 | * If genpd->status is active, it means we are just | |
240 | * out of off and so update the idle time and vice | |
241 | * versa. | |
242 | */ | |
bd40cbb0 UH |
243 | if (genpd->status == GENPD_STATE_ON) |
244 | genpd->states[genpd->state_idx].idle_time += delta; | |
245 | else | |
246 | genpd->on_time += delta; | |
afece3ab TG |
247 | |
248 | genpd->accounting_time = now; | |
249 | } | |
250 | #else | |
718072ce TS |
251 | static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} |
252 | static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} | |
afece3ab TG |
253 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
254 | #endif | |
255 | ||
cd50c6d3 VK |
256 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
257 | unsigned int state) | |
258 | { | |
259 | struct generic_pm_domain_data *pd_data; | |
260 | struct pm_domain_data *pdd; | |
18edf49c | 261 | struct gpd_link *link; |
cd50c6d3 VK |
262 | |
263 | /* New requested state is same as Max requested state */ | |
264 | if (state == genpd->performance_state) | |
265 | return state; | |
266 | ||
267 | /* New requested state is higher than Max requested state */ | |
268 | if (state > genpd->performance_state) | |
269 | return state; | |
270 | ||
271 | /* Traverse all devices within the domain */ | |
272 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { | |
273 | pd_data = to_gpd_data(pdd); | |
274 | ||
275 | if (pd_data->performance_state > state) | |
276 | state = pd_data->performance_state; | |
277 | } | |
278 | ||
279 | /* | |
18edf49c VK |
280 | * Traverse all sub-domains within the domain. This can be |
281 | * done without any additional locking as the link->performance_state | |
8d87ae48 | 282 | * field is protected by the parent genpd->lock, which is already taken. |
18edf49c VK |
283 | * |
284 | * Also note that link->performance_state (subdomain's performance state | |
8d87ae48 KC |
285 | * requirement to parent domain) is different from |
286 | * link->child->performance_state (current performance state requirement | |
18edf49c VK |
287 | * of the devices/sub-domains of the subdomain) and so can have a |
288 | * different value. | |
289 | * | |
290 | * Note that we also take vote from powered-off sub-domains into account | |
291 | * as the same is done for devices right now. | |
cd50c6d3 | 292 | */ |
8d87ae48 | 293 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
18edf49c VK |
294 | if (link->performance_state > state) |
295 | state = link->performance_state; | |
296 | } | |
297 | ||
cd50c6d3 VK |
298 | return state; |
299 | } | |
300 | ||
079c42a0 DO |
301 | static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, |
302 | struct generic_pm_domain *parent, | |
303 | unsigned int pstate) | |
304 | { | |
305 | if (!parent->set_performance_state) | |
306 | return pstate; | |
307 | ||
308 | return dev_pm_opp_xlate_performance_state(genpd->opp_table, | |
309 | parent->opp_table, | |
310 | pstate); | |
311 | } | |
312 | ||
cd50c6d3 | 313 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
18edf49c | 314 | unsigned int state, int depth) |
cd50c6d3 | 315 | { |
8d87ae48 | 316 | struct generic_pm_domain *parent; |
18edf49c | 317 | struct gpd_link *link; |
8d87ae48 | 318 | int parent_state, ret; |
cd50c6d3 VK |
319 | |
320 | if (state == genpd->performance_state) | |
321 | return 0; | |
322 | ||
8d87ae48 KC |
323 | /* Propagate to parents of genpd */ |
324 | list_for_each_entry(link, &genpd->child_links, child_node) { | |
325 | parent = link->parent; | |
18edf49c | 326 | |
8d87ae48 | 327 | /* Find parent's performance state */ |
079c42a0 | 328 | ret = genpd_xlate_performance_state(genpd, parent, state); |
18edf49c VK |
329 | if (unlikely(ret < 0)) |
330 | goto err; | |
331 | ||
8d87ae48 | 332 | parent_state = ret; |
18edf49c | 333 | |
8d87ae48 | 334 | genpd_lock_nested(parent, depth + 1); |
18edf49c VK |
335 | |
336 | link->prev_performance_state = link->performance_state; | |
8d87ae48 KC |
337 | link->performance_state = parent_state; |
338 | parent_state = _genpd_reeval_performance_state(parent, | |
339 | parent_state); | |
340 | ret = _genpd_set_performance_state(parent, parent_state, depth + 1); | |
18edf49c VK |
341 | if (ret) |
342 | link->performance_state = link->prev_performance_state; | |
343 | ||
8d87ae48 | 344 | genpd_unlock(parent); |
18edf49c VK |
345 | |
346 | if (ret) | |
347 | goto err; | |
348 | } | |
349 | ||
079c42a0 DO |
350 | if (genpd->set_performance_state) { |
351 | ret = genpd->set_performance_state(genpd, state); | |
352 | if (ret) | |
353 | goto err; | |
354 | } | |
cd50c6d3 VK |
355 | |
356 | genpd->performance_state = state; | |
357 | return 0; | |
18edf49c VK |
358 | |
359 | err: | |
360 | /* Encountered an error, lets rollback */ | |
8d87ae48 KC |
361 | list_for_each_entry_continue_reverse(link, &genpd->child_links, |
362 | child_node) { | |
363 | parent = link->parent; | |
18edf49c | 364 | |
8d87ae48 | 365 | genpd_lock_nested(parent, depth + 1); |
18edf49c | 366 | |
8d87ae48 KC |
367 | parent_state = link->prev_performance_state; |
368 | link->performance_state = parent_state; | |
18edf49c | 369 | |
8d87ae48 KC |
370 | parent_state = _genpd_reeval_performance_state(parent, |
371 | parent_state); | |
372 | if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { | |
18edf49c | 373 | pr_err("%s: Failed to roll back to %d performance state\n", |
8d87ae48 | 374 | parent->name, parent_state); |
18edf49c VK |
375 | } |
376 | ||
8d87ae48 | 377 | genpd_unlock(parent); |
18edf49c VK |
378 | } |
379 | ||
380 | return ret; | |
cd50c6d3 VK |
381 | } |
382 | ||
0eef091d UH |
383 | static int genpd_set_performance_state(struct device *dev, unsigned int state) |
384 | { | |
385 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
386 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); | |
387 | unsigned int prev_state; | |
388 | int ret; | |
389 | ||
390 | prev_state = gpd_data->performance_state; | |
d97fe100 UH |
391 | if (prev_state == state) |
392 | return 0; | |
393 | ||
0eef091d UH |
394 | gpd_data->performance_state = state; |
395 | state = _genpd_reeval_performance_state(genpd, state); | |
396 | ||
397 | ret = _genpd_set_performance_state(genpd, state, 0); | |
398 | if (ret) | |
399 | gpd_data->performance_state = prev_state; | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
5937c3ce UH |
404 | static int genpd_drop_performance_state(struct device *dev) |
405 | { | |
406 | unsigned int prev_state = dev_gpd_data(dev)->performance_state; | |
407 | ||
408 | if (!genpd_set_performance_state(dev, 0)) | |
409 | return prev_state; | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static void genpd_restore_performance_state(struct device *dev, | |
415 | unsigned int state) | |
416 | { | |
417 | if (state) | |
418 | genpd_set_performance_state(dev, state); | |
419 | } | |
420 | ||
401e0920 UH |
421 | static int genpd_dev_pm_set_performance_state(struct device *dev, |
422 | unsigned int state) | |
423 | { | |
424 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
425 | int ret = 0; | |
426 | ||
427 | genpd_lock(genpd); | |
428 | if (pm_runtime_suspended(dev)) { | |
429 | dev_gpd_data(dev)->rpm_pstate = state; | |
430 | } else { | |
431 | ret = genpd_set_performance_state(dev, state); | |
432 | if (!ret) | |
433 | dev_gpd_data(dev)->rpm_pstate = 0; | |
434 | } | |
435 | genpd_unlock(genpd); | |
436 | ||
437 | return ret; | |
438 | } | |
439 | ||
42f6284a VK |
440 | /** |
441 | * dev_pm_genpd_set_performance_state- Set performance state of device's power | |
442 | * domain. | |
443 | * | |
444 | * @dev: Device for which the performance-state needs to be set. | |
445 | * @state: Target performance state of the device. This can be set as 0 when the | |
446 | * device doesn't have any performance state constraints left (And so | |
447 | * the device wouldn't participate anymore to find the target | |
448 | * performance state of the genpd). | |
449 | * | |
450 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
451 | * while this routine is getting called. | |
452 | * | |
453 | * Returns 0 on success and negative error values on failures. | |
454 | */ | |
455 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) | |
456 | { | |
457 | struct generic_pm_domain *genpd; | |
42f6284a | 458 | |
3ea4ca92 UH |
459 | genpd = dev_to_genpd_safe(dev); |
460 | if (!genpd) | |
42f6284a VK |
461 | return -ENODEV; |
462 | ||
e757e7fa YL |
463 | if (WARN_ON(!dev->power.subsys_data || |
464 | !dev->power.subsys_data->domain_data)) | |
42f6284a | 465 | return -EINVAL; |
42f6284a | 466 | |
401e0920 | 467 | return genpd_dev_pm_set_performance_state(dev, state); |
42f6284a VK |
468 | } |
469 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); | |
470 | ||
67e3242e LI |
471 | /** |
472 | * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. | |
473 | * | |
474 | * @dev: Device to handle | |
475 | * @next: impending interrupt/wakeup for the device | |
476 | * | |
477 | * | |
478 | * Allow devices to inform of the next wakeup. It's assumed that the users | |
479 | * guarantee that the genpd wouldn't be detached while this routine is getting | |
480 | * called. Additionally, it's also assumed that @dev isn't runtime suspended | |
481 | * (RPM_SUSPENDED)." | |
482 | * Although devices are expected to update the next_wakeup after the end of | |
483 | * their usecase as well, it is possible the devices themselves may not know | |
484 | * about that, so stale @next will be ignored when powering off the domain. | |
485 | */ | |
486 | void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) | |
487 | { | |
67e3242e | 488 | struct generic_pm_domain *genpd; |
9c74f2ac | 489 | struct gpd_timing_data *td; |
67e3242e LI |
490 | |
491 | genpd = dev_to_genpd_safe(dev); | |
492 | if (!genpd) | |
493 | return; | |
494 | ||
9c74f2ac UH |
495 | td = to_gpd_data(dev->power.subsys_data->domain_data)->td; |
496 | if (td) | |
497 | td->next_wakeup = next; | |
67e3242e LI |
498 | } |
499 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); | |
500 | ||
1498c503 MS |
501 | /** |
502 | * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd | |
503 | * @dev: A device that is attached to the genpd. | |
504 | * | |
505 | * This routine should typically be called for a device, at the point of when a | |
506 | * GENPD_NOTIFY_PRE_OFF notification has been sent for it. | |
507 | * | |
508 | * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no | |
509 | * valid value have been set. | |
510 | */ | |
511 | ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev) | |
512 | { | |
513 | struct generic_pm_domain *genpd; | |
514 | ||
515 | genpd = dev_to_genpd_safe(dev); | |
516 | if (!genpd) | |
517 | return KTIME_MAX; | |
518 | ||
519 | if (genpd->gd) | |
520 | return genpd->gd->next_hrtimer; | |
521 | ||
522 | return KTIME_MAX; | |
523 | } | |
524 | EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer); | |
525 | ||
a9236a0a UH |
526 | /* |
527 | * dev_pm_genpd_synced_poweroff - Next power off should be synchronous | |
528 | * | |
529 | * @dev: A device that is attached to the genpd. | |
530 | * | |
531 | * Allows a consumer of the genpd to notify the provider that the next power off | |
532 | * should be synchronous. | |
533 | * | |
534 | * It is assumed that the users guarantee that the genpd wouldn't be detached | |
535 | * while this routine is getting called. | |
536 | */ | |
537 | void dev_pm_genpd_synced_poweroff(struct device *dev) | |
538 | { | |
539 | struct generic_pm_domain *genpd; | |
540 | ||
541 | genpd = dev_to_genpd_safe(dev); | |
542 | if (!genpd) | |
543 | return; | |
544 | ||
545 | genpd_lock(genpd); | |
546 | genpd->synced_poweroff = true; | |
547 | genpd_unlock(genpd); | |
548 | } | |
549 | EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff); | |
550 | ||
86e12eac | 551 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 552 | { |
fc5cbf0c | 553 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
554 | ktime_t time_start; |
555 | s64 elapsed_ns; | |
330e3932 | 556 | int ret; |
d4f81383 UH |
557 | |
558 | /* Notify consumers that we are about to power on. */ | |
330e3932 UH |
559 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
560 | GENPD_NOTIFY_PRE_ON, | |
561 | GENPD_NOTIFY_OFF, NULL); | |
d4f81383 UH |
562 | ret = notifier_to_errno(ret); |
563 | if (ret) | |
330e3932 | 564 | return ret; |
c8f0ea45 GU |
565 | |
566 | if (!genpd->power_on) | |
d4f81383 | 567 | goto out; |
c8f0ea45 | 568 | |
b2a92f35 | 569 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
d4f81383 UH |
570 | if (!timed) { |
571 | ret = genpd->power_on(genpd); | |
572 | if (ret) | |
573 | goto err; | |
574 | ||
575 | goto out; | |
576 | } | |
a4630c61 | 577 | |
c8f0ea45 GU |
578 | time_start = ktime_get(); |
579 | ret = genpd->power_on(genpd); | |
580 | if (ret) | |
d4f81383 | 581 | goto err; |
c8f0ea45 GU |
582 | |
583 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 584 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
d4f81383 | 585 | goto out; |
c8f0ea45 | 586 | |
fc5cbf0c | 587 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
6961795f | 588 | genpd->gd->max_off_time_changed = true; |
6d7d5c32 RK |
589 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
590 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 | 591 | |
d4f81383 UH |
592 | out: |
593 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); | |
a9236a0a | 594 | genpd->synced_poweroff = false; |
d4f81383 UH |
595 | return 0; |
596 | err: | |
597 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
598 | NULL); | |
c8f0ea45 GU |
599 | return ret; |
600 | } | |
601 | ||
86e12eac | 602 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 | 603 | { |
fc5cbf0c | 604 | unsigned int state_idx = genpd->state_idx; |
c8f0ea45 GU |
605 | ktime_t time_start; |
606 | s64 elapsed_ns; | |
330e3932 | 607 | int ret; |
d4f81383 UH |
608 | |
609 | /* Notify consumers that we are about to power off. */ | |
330e3932 UH |
610 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
611 | GENPD_NOTIFY_PRE_OFF, | |
612 | GENPD_NOTIFY_ON, NULL); | |
d4f81383 UH |
613 | ret = notifier_to_errno(ret); |
614 | if (ret) | |
330e3932 | 615 | return ret; |
c8f0ea45 GU |
616 | |
617 | if (!genpd->power_off) | |
d4f81383 UH |
618 | goto out; |
619 | ||
b2a92f35 | 620 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
d4f81383 UH |
621 | if (!timed) { |
622 | ret = genpd->power_off(genpd); | |
623 | if (ret) | |
624 | goto busy; | |
c8f0ea45 | 625 | |
d4f81383 UH |
626 | goto out; |
627 | } | |
a4630c61 | 628 | |
c8f0ea45 GU |
629 | time_start = ktime_get(); |
630 | ret = genpd->power_off(genpd); | |
0cec68a9 | 631 | if (ret) |
d4f81383 | 632 | goto busy; |
c8f0ea45 GU |
633 | |
634 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
fc5cbf0c | 635 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
d4f81383 | 636 | goto out; |
c8f0ea45 | 637 | |
fc5cbf0c | 638 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
6961795f | 639 | genpd->gd->max_off_time_changed = true; |
6d7d5c32 RK |
640 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
641 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 | 642 | |
d4f81383 UH |
643 | out: |
644 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, | |
645 | NULL); | |
0cec68a9 | 646 | return 0; |
d4f81383 | 647 | busy: |
330e3932 | 648 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
d4f81383 | 649 | return ret; |
c8f0ea45 GU |
650 | } |
651 | ||
29e47e21 | 652 | /** |
86e12eac | 653 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
a3d09c73 | 654 | * @genpd: PM domain to power off. |
29e47e21 | 655 | * |
86e12eac | 656 | * Queue up the execution of genpd_power_off() unless it's already been done |
29e47e21 UH |
657 | * before. |
658 | */ | |
659 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
660 | { | |
661 | queue_work(pm_wq, &genpd->power_off_work); | |
662 | } | |
663 | ||
1f8728b7 UH |
664 | /** |
665 | * genpd_power_off - Remove power from a given PM domain. | |
666 | * @genpd: PM domain to power down. | |
3c64649d UH |
667 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
668 | * RPM status of the releated device is in an intermediate state, not yet turned | |
669 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not | |
670 | * be RPM_SUSPENDED, while it tries to power off the PM domain. | |
763663c9 | 671 | * @depth: nesting count for lockdep. |
1f8728b7 UH |
672 | * |
673 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
674 | * have been powered down, remove power from @genpd. | |
675 | */ | |
2da83545 UH |
676 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
677 | unsigned int depth) | |
1f8728b7 UH |
678 | { |
679 | struct pm_domain_data *pdd; | |
680 | struct gpd_link *link; | |
681 | unsigned int not_suspended = 0; | |
f63816e4 | 682 | int ret; |
1f8728b7 UH |
683 | |
684 | /* | |
685 | * Do not try to power off the domain in the following situations: | |
686 | * (1) The domain is already in the "power off" state. | |
687 | * (2) System suspend is in progress. | |
688 | */ | |
41e2c8e0 | 689 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
1f8728b7 UH |
690 | return 0; |
691 | ||
ffaa42e8 UH |
692 | /* |
693 | * Abort power off for the PM domain in the following situations: | |
694 | * (1) The domain is configured as always on. | |
695 | * (2) When the domain has a subdomain being powered on. | |
696 | */ | |
ed61e18a LC |
697 | if (genpd_is_always_on(genpd) || |
698 | genpd_is_rpm_always_on(genpd) || | |
699 | atomic_read(&genpd->sd_count) > 0) | |
1f8728b7 UH |
700 | return -EBUSY; |
701 | ||
e7d90cfa UH |
702 | /* |
703 | * The children must be in their deepest (powered-off) states to allow | |
704 | * the parent to be powered off. Note that, there's no need for | |
705 | * additional locking, as powering on a child, requires the parent's | |
706 | * lock to be acquired first. | |
707 | */ | |
708 | list_for_each_entry(link, &genpd->parent_links, parent_node) { | |
709 | struct generic_pm_domain *child = link->child; | |
710 | if (child->state_idx < child->state_count - 1) | |
711 | return -EBUSY; | |
712 | } | |
713 | ||
1f8728b7 | 714 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
1f8728b7 UH |
715 | /* |
716 | * Do not allow PM domain to be powered off, when an IRQ safe | |
717 | * device is part of a non-IRQ safe domain. | |
718 | */ | |
719 | if (!pm_runtime_suspended(pdd->dev) || | |
7a02444b | 720 | irq_safe_dev_in_sleep_domain(pdd->dev, genpd)) |
1f8728b7 UH |
721 | not_suspended++; |
722 | } | |
723 | ||
3c64649d | 724 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
1f8728b7 UH |
725 | return -EBUSY; |
726 | ||
727 | if (genpd->gov && genpd->gov->power_down_ok) { | |
728 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
729 | return -EAGAIN; | |
730 | } | |
731 | ||
2c9b7f87 UH |
732 | /* Default to shallowest state. */ |
733 | if (!genpd->gov) | |
734 | genpd->state_idx = 0; | |
735 | ||
f63816e4 UH |
736 | /* Don't power off, if a child domain is waiting to power on. */ |
737 | if (atomic_read(&genpd->sd_count) > 0) | |
738 | return -EBUSY; | |
1f8728b7 | 739 | |
f63816e4 | 740 | ret = _genpd_power_off(genpd, true); |
c6a113b5 LI |
741 | if (ret) { |
742 | genpd->states[genpd->state_idx].rejected++; | |
f63816e4 | 743 | return ret; |
c6a113b5 | 744 | } |
1f8728b7 | 745 | |
49f618e1 | 746 | genpd->status = GENPD_STATE_OFF; |
afece3ab | 747 | genpd_update_accounting(genpd); |
c6a113b5 | 748 | genpd->states[genpd->state_idx].usage++; |
1f8728b7 | 749 | |
8d87ae48 KC |
750 | list_for_each_entry(link, &genpd->child_links, child_node) { |
751 | genpd_sd_counter_dec(link->parent); | |
752 | genpd_lock_nested(link->parent, depth + 1); | |
753 | genpd_power_off(link->parent, false, depth + 1); | |
754 | genpd_unlock(link->parent); | |
1f8728b7 UH |
755 | } |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
5248051b | 760 | /** |
8d87ae48 | 761 | * genpd_power_on - Restore power to a given PM domain and its parents. |
5248051b | 762 | * @genpd: PM domain to power up. |
0106ef51 | 763 | * @depth: nesting count for lockdep. |
5248051b | 764 | * |
8d87ae48 | 765 | * Restore power to @genpd and all of its parents so that it is possible to |
5248051b RW |
766 | * resume a device belonging to it. |
767 | */ | |
86e12eac | 768 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
5248051b | 769 | { |
5063ce15 | 770 | struct gpd_link *link; |
5248051b RW |
771 | int ret = 0; |
772 | ||
41e2c8e0 | 773 | if (genpd_status_on(genpd)) |
3f241775 | 774 | return 0; |
5248051b | 775 | |
5063ce15 RW |
776 | /* |
777 | * The list is guaranteed not to change while the loop below is being | |
8d87ae48 | 778 | * executed, unless one of the parents' .power_on() callbacks fiddles |
5063ce15 RW |
779 | * with it. |
780 | */ | |
8d87ae48 KC |
781 | list_for_each_entry(link, &genpd->child_links, child_node) { |
782 | struct generic_pm_domain *parent = link->parent; | |
0106ef51 | 783 | |
8d87ae48 | 784 | genpd_sd_counter_inc(parent); |
0106ef51 | 785 | |
8d87ae48 KC |
786 | genpd_lock_nested(parent, depth + 1); |
787 | ret = genpd_power_on(parent, depth + 1); | |
788 | genpd_unlock(parent); | |
5248051b | 789 | |
5063ce15 | 790 | if (ret) { |
8d87ae48 | 791 | genpd_sd_counter_dec(parent); |
9e08cf42 | 792 | goto err; |
5063ce15 | 793 | } |
5248051b RW |
794 | } |
795 | ||
86e12eac | 796 | ret = _genpd_power_on(genpd, true); |
c8f0ea45 GU |
797 | if (ret) |
798 | goto err; | |
5248051b | 799 | |
49f618e1 | 800 | genpd->status = GENPD_STATE_ON; |
afece3ab TG |
801 | genpd_update_accounting(genpd); |
802 | ||
3f241775 | 803 | return 0; |
9e08cf42 RW |
804 | |
805 | err: | |
29e47e21 | 806 | list_for_each_entry_continue_reverse(link, |
8d87ae48 KC |
807 | &genpd->child_links, |
808 | child_node) { | |
809 | genpd_sd_counter_dec(link->parent); | |
810 | genpd_lock_nested(link->parent, depth + 1); | |
811 | genpd_power_off(link->parent, false, depth + 1); | |
812 | genpd_unlock(link->parent); | |
29e47e21 | 813 | } |
9e08cf42 | 814 | |
3f241775 RW |
815 | return ret; |
816 | } | |
817 | ||
ea71c596 UH |
818 | static int genpd_dev_pm_start(struct device *dev) |
819 | { | |
820 | struct generic_pm_domain *genpd = dev_to_genpd(dev); | |
821 | ||
822 | return genpd_start_dev(genpd, dev); | |
823 | } | |
824 | ||
6ff7bb0d RW |
825 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
826 | unsigned long val, void *ptr) | |
827 | { | |
828 | struct generic_pm_domain_data *gpd_data; | |
829 | struct device *dev; | |
830 | ||
831 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 832 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
833 | |
834 | for (;;) { | |
f38d1a6d | 835 | struct generic_pm_domain *genpd = ERR_PTR(-ENODATA); |
6ff7bb0d | 836 | struct pm_domain_data *pdd; |
66d29d80 | 837 | struct gpd_timing_data *td; |
6ff7bb0d RW |
838 | |
839 | spin_lock_irq(&dev->power.lock); | |
840 | ||
841 | pdd = dev->power.subsys_data ? | |
842 | dev->power.subsys_data->domain_data : NULL; | |
b4883ca4 | 843 | if (pdd) { |
66d29d80 | 844 | td = to_gpd_data(pdd)->td; |
f38d1a6d | 845 | if (td) { |
66d29d80 | 846 | td->constraint_changed = true; |
f38d1a6d UH |
847 | genpd = dev_to_genpd(dev); |
848 | } | |
6ff7bb0d RW |
849 | } |
850 | ||
851 | spin_unlock_irq(&dev->power.lock); | |
852 | ||
853 | if (!IS_ERR(genpd)) { | |
35241d12 | 854 | genpd_lock(genpd); |
f38d1a6d | 855 | genpd->gd->max_off_time_changed = true; |
35241d12 | 856 | genpd_unlock(genpd); |
6ff7bb0d RW |
857 | } |
858 | ||
859 | dev = dev->parent; | |
860 | if (!dev || dev->power.ignore_children) | |
861 | break; | |
862 | } | |
863 | ||
864 | return NOTIFY_DONE; | |
865 | } | |
866 | ||
f721889f RW |
867 | /** |
868 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
869 | * @work: Work structure used for scheduling the execution of this function. | |
870 | */ | |
871 | static void genpd_power_off_work_fn(struct work_struct *work) | |
872 | { | |
873 | struct generic_pm_domain *genpd; | |
874 | ||
875 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
876 | ||
35241d12 | 877 | genpd_lock(genpd); |
2da83545 | 878 | genpd_power_off(genpd, false, 0); |
35241d12 | 879 | genpd_unlock(genpd); |
f721889f RW |
880 | } |
881 | ||
54eeddbf UH |
882 | /** |
883 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks | |
884 | * @dev: Device to handle. | |
885 | */ | |
886 | static int __genpd_runtime_suspend(struct device *dev) | |
887 | { | |
888 | int (*cb)(struct device *__dev); | |
889 | ||
890 | if (dev->type && dev->type->pm) | |
891 | cb = dev->type->pm->runtime_suspend; | |
892 | else if (dev->class && dev->class->pm) | |
893 | cb = dev->class->pm->runtime_suspend; | |
894 | else if (dev->bus && dev->bus->pm) | |
895 | cb = dev->bus->pm->runtime_suspend; | |
896 | else | |
897 | cb = NULL; | |
898 | ||
899 | if (!cb && dev->driver && dev->driver->pm) | |
900 | cb = dev->driver->pm->runtime_suspend; | |
901 | ||
902 | return cb ? cb(dev) : 0; | |
903 | } | |
904 | ||
905 | /** | |
906 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks | |
907 | * @dev: Device to handle. | |
908 | */ | |
909 | static int __genpd_runtime_resume(struct device *dev) | |
910 | { | |
911 | int (*cb)(struct device *__dev); | |
912 | ||
913 | if (dev->type && dev->type->pm) | |
914 | cb = dev->type->pm->runtime_resume; | |
915 | else if (dev->class && dev->class->pm) | |
916 | cb = dev->class->pm->runtime_resume; | |
917 | else if (dev->bus && dev->bus->pm) | |
918 | cb = dev->bus->pm->runtime_resume; | |
919 | else | |
920 | cb = NULL; | |
921 | ||
922 | if (!cb && dev->driver && dev->driver->pm) | |
923 | cb = dev->driver->pm->runtime_resume; | |
924 | ||
925 | return cb ? cb(dev) : 0; | |
926 | } | |
927 | ||
f721889f | 928 | /** |
795bd2e7 | 929 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
f721889f RW |
930 | * @dev: Device to suspend. |
931 | * | |
932 | * Carry out a runtime suspend of a device under the assumption that its | |
933 | * pm_domain field points to the domain member of an object of type | |
934 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
935 | */ | |
795bd2e7 | 936 | static int genpd_runtime_suspend(struct device *dev) |
f721889f RW |
937 | { |
938 | struct generic_pm_domain *genpd; | |
9df3921e | 939 | bool (*suspend_ok)(struct device *__dev); |
5937c3ce | 940 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
66d29d80 | 941 | struct gpd_timing_data *td = gpd_data->td; |
ffe12855 | 942 | bool runtime_pm = pm_runtime_enabled(dev); |
3b84bf3c | 943 | ktime_t time_start = 0; |
2b1d88cd | 944 | s64 elapsed_ns; |
d5e4cbfe | 945 | int ret; |
f721889f RW |
946 | |
947 | dev_dbg(dev, "%s()\n", __func__); | |
948 | ||
5248051b RW |
949 | genpd = dev_to_genpd(dev); |
950 | if (IS_ERR(genpd)) | |
f721889f RW |
951 | return -EINVAL; |
952 | ||
ffe12855 UH |
953 | /* |
954 | * A runtime PM centric subsystem/driver may re-use the runtime PM | |
955 | * callbacks for other purposes than runtime PM. In those scenarios | |
956 | * runtime PM is disabled. Under these circumstances, we shall skip | |
957 | * validating/measuring the PM QoS latency. | |
958 | */ | |
9df3921e UH |
959 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
960 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) | |
b02c999a RW |
961 | return -EBUSY; |
962 | ||
2b1d88cd | 963 | /* Measure suspend latency. */ |
3b84bf3c | 964 | if (td && runtime_pm) |
ffe12855 | 965 | time_start = ktime_get(); |
2b1d88cd | 966 | |
54eeddbf | 967 | ret = __genpd_runtime_suspend(dev); |
d5e4cbfe RW |
968 | if (ret) |
969 | return ret; | |
17b75eca | 970 | |
2b1d88cd | 971 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 972 | if (ret) { |
54eeddbf | 973 | __genpd_runtime_resume(dev); |
ba2bbfbf UH |
974 | return ret; |
975 | } | |
976 | ||
2b1d88cd | 977 | /* Update suspend latency value if the measured time exceeds it. */ |
3b84bf3c | 978 | if (td && runtime_pm) { |
ffe12855 | 979 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
3b84bf3c | 980 | if (elapsed_ns > td->suspend_latency_ns) { |
ffe12855 UH |
981 | td->suspend_latency_ns = elapsed_ns; |
982 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
983 | elapsed_ns); | |
f38d1a6d | 984 | genpd->gd->max_off_time_changed = true; |
ffe12855 UH |
985 | td->constraint_changed = true; |
986 | } | |
2b1d88cd UH |
987 | } |
988 | ||
0aa2a221 | 989 | /* |
d716f479 LI |
990 | * If power.irq_safe is set, this routine may be run with |
991 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. | |
0aa2a221 | 992 | */ |
7a02444b | 993 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
0aa2a221 RW |
994 | return 0; |
995 | ||
35241d12 | 996 | genpd_lock(genpd); |
2da83545 | 997 | genpd_power_off(genpd, true, 0); |
ae8ac196 | 998 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
35241d12 | 999 | genpd_unlock(genpd); |
f721889f RW |
1000 | |
1001 | return 0; | |
1002 | } | |
1003 | ||
f721889f | 1004 | /** |
795bd2e7 | 1005 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
f721889f RW |
1006 | * @dev: Device to resume. |
1007 | * | |
1008 | * Carry out a runtime resume of a device under the assumption that its | |
1009 | * pm_domain field points to the domain member of an object of type | |
1010 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
1011 | */ | |
795bd2e7 | 1012 | static int genpd_runtime_resume(struct device *dev) |
f721889f RW |
1013 | { |
1014 | struct generic_pm_domain *genpd; | |
5937c3ce | 1015 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
66d29d80 | 1016 | struct gpd_timing_data *td = gpd_data->td; |
3b84bf3c UH |
1017 | bool timed = td && pm_runtime_enabled(dev); |
1018 | ktime_t time_start = 0; | |
2b1d88cd | 1019 | s64 elapsed_ns; |
f721889f RW |
1020 | int ret; |
1021 | ||
1022 | dev_dbg(dev, "%s()\n", __func__); | |
1023 | ||
5248051b RW |
1024 | genpd = dev_to_genpd(dev); |
1025 | if (IS_ERR(genpd)) | |
f721889f RW |
1026 | return -EINVAL; |
1027 | ||
d716f479 LI |
1028 | /* |
1029 | * As we don't power off a non IRQ safe domain, which holds | |
1030 | * an IRQ safe device, we don't need to restore power to it. | |
1031 | */ | |
a294237a | 1032 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
ba2bbfbf | 1033 | goto out; |
0aa2a221 | 1034 | |
35241d12 | 1035 | genpd_lock(genpd); |
ae8ac196 | 1036 | genpd_restore_performance_state(dev, gpd_data->rpm_pstate); |
86e12eac | 1037 | ret = genpd_power_on(genpd, 0); |
35241d12 | 1038 | genpd_unlock(genpd); |
c6d22b37 | 1039 | |
ba2bbfbf UH |
1040 | if (ret) |
1041 | return ret; | |
c6d22b37 | 1042 | |
ba2bbfbf | 1043 | out: |
2b1d88cd | 1044 | /* Measure resume latency. */ |
3b84bf3c | 1045 | if (timed) |
2b1d88cd UH |
1046 | time_start = ktime_get(); |
1047 | ||
076395ca LP |
1048 | ret = genpd_start_dev(genpd, dev); |
1049 | if (ret) | |
1050 | goto err_poweroff; | |
1051 | ||
54eeddbf | 1052 | ret = __genpd_runtime_resume(dev); |
076395ca LP |
1053 | if (ret) |
1054 | goto err_stop; | |
2b1d88cd UH |
1055 | |
1056 | /* Update resume latency value if the measured time exceeds it. */ | |
3b84bf3c | 1057 | if (timed) { |
2b1d88cd | 1058 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
3b84bf3c | 1059 | if (elapsed_ns > td->resume_latency_ns) { |
2b1d88cd UH |
1060 | td->resume_latency_ns = elapsed_ns; |
1061 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
1062 | elapsed_ns); | |
f38d1a6d | 1063 | genpd->gd->max_off_time_changed = true; |
2b1d88cd UH |
1064 | td->constraint_changed = true; |
1065 | } | |
1066 | } | |
17b75eca | 1067 | |
f721889f | 1068 | return 0; |
076395ca LP |
1069 | |
1070 | err_stop: | |
1071 | genpd_stop_dev(genpd, dev); | |
1072 | err_poweroff: | |
6dc466d3 | 1073 | if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { |
35241d12 | 1074 | genpd_lock(genpd); |
2da83545 | 1075 | genpd_power_off(genpd, true, 0); |
ae8ac196 | 1076 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
35241d12 | 1077 | genpd_unlock(genpd); |
076395ca LP |
1078 | } |
1079 | ||
1080 | return ret; | |
f721889f RW |
1081 | } |
1082 | ||
39ac5ba5 TB |
1083 | static bool pd_ignore_unused; |
1084 | static int __init pd_ignore_unused_setup(char *__unused) | |
1085 | { | |
1086 | pd_ignore_unused = true; | |
1087 | return 1; | |
1088 | } | |
1089 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
1090 | ||
17f2ae7f | 1091 | /** |
86e12eac | 1092 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 1093 | */ |
86e12eac | 1094 | static int __init genpd_power_off_unused(void) |
17f2ae7f RW |
1095 | { |
1096 | struct generic_pm_domain *genpd; | |
1097 | ||
39ac5ba5 TB |
1098 | if (pd_ignore_unused) { |
1099 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 1100 | return 0; |
39ac5ba5 TB |
1101 | } |
1102 | ||
17f2ae7f RW |
1103 | mutex_lock(&gpd_list_lock); |
1104 | ||
1105 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
1106 | genpd_queue_power_off_work(genpd); | |
1107 | ||
1108 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 1109 | |
2fe71dcd UH |
1110 | return 0; |
1111 | } | |
741ba013 | 1112 | late_initcall_sync(genpd_power_off_unused); |
2fe71dcd | 1113 | |
0159ec67 JH |
1114 | #ifdef CONFIG_PM_SLEEP |
1115 | ||
596ba34b | 1116 | /** |
8d87ae48 | 1117 | * genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
596ba34b | 1118 | * @genpd: PM domain to power off, if possible. |
0883ac03 UH |
1119 | * @use_lock: use the lock. |
1120 | * @depth: nesting count for lockdep. | |
596ba34b RW |
1121 | * |
1122 | * Check if the given PM domain can be powered off (during system suspend or | |
8d87ae48 | 1123 | * hibernation) and do that if so. Also, in that case propagate to its parents. |
596ba34b | 1124 | * |
77f827de | 1125 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1126 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1127 | * these cases the lock must be held. | |
596ba34b | 1128 | */ |
0883ac03 UH |
1129 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
1130 | unsigned int depth) | |
596ba34b | 1131 | { |
5063ce15 | 1132 | struct gpd_link *link; |
596ba34b | 1133 | |
ffaa42e8 | 1134 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
596ba34b RW |
1135 | return; |
1136 | ||
c4bb3160 RW |
1137 | if (genpd->suspended_count != genpd->device_count |
1138 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
1139 | return; |
1140 | ||
e7d90cfa UH |
1141 | /* Check that the children are in their deepest (powered-off) state. */ |
1142 | list_for_each_entry(link, &genpd->parent_links, parent_node) { | |
1143 | struct generic_pm_domain *child = link->child; | |
1144 | if (child->state_idx < child->state_count - 1) | |
1145 | return; | |
1146 | } | |
1147 | ||
fc5cbf0c AH |
1148 | /* Choose the deepest state when suspending */ |
1149 | genpd->state_idx = genpd->state_count - 1; | |
1c14967c UH |
1150 | if (_genpd_power_off(genpd, false)) |
1151 | return; | |
596ba34b | 1152 | |
49f618e1 | 1153 | genpd->status = GENPD_STATE_OFF; |
5063ce15 | 1154 | |
8d87ae48 KC |
1155 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1156 | genpd_sd_counter_dec(link->parent); | |
0883ac03 UH |
1157 | |
1158 | if (use_lock) | |
8d87ae48 | 1159 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1160 | |
8d87ae48 | 1161 | genpd_sync_power_off(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1162 | |
1163 | if (use_lock) | |
8d87ae48 | 1164 | genpd_unlock(link->parent); |
596ba34b RW |
1165 | } |
1166 | } | |
1167 | ||
802d8b49 | 1168 | /** |
8d87ae48 | 1169 | * genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
802d8b49 | 1170 | * @genpd: PM domain to power on. |
0883ac03 UH |
1171 | * @use_lock: use the lock. |
1172 | * @depth: nesting count for lockdep. | |
802d8b49 | 1173 | * |
77f827de | 1174 | * This function is only called in "noirq" and "syscore" stages of system power |
0883ac03 UH |
1175 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
1176 | * these cases the lock must be held. | |
802d8b49 | 1177 | */ |
0883ac03 UH |
1178 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
1179 | unsigned int depth) | |
802d8b49 RW |
1180 | { |
1181 | struct gpd_link *link; | |
1182 | ||
41e2c8e0 | 1183 | if (genpd_status_on(genpd)) |
802d8b49 RW |
1184 | return; |
1185 | ||
8d87ae48 KC |
1186 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1187 | genpd_sd_counter_inc(link->parent); | |
0883ac03 UH |
1188 | |
1189 | if (use_lock) | |
8d87ae48 | 1190 | genpd_lock_nested(link->parent, depth + 1); |
0883ac03 | 1191 | |
8d87ae48 | 1192 | genpd_sync_power_on(link->parent, use_lock, depth + 1); |
0883ac03 UH |
1193 | |
1194 | if (use_lock) | |
8d87ae48 | 1195 | genpd_unlock(link->parent); |
802d8b49 RW |
1196 | } |
1197 | ||
86e12eac | 1198 | _genpd_power_on(genpd, false); |
49f618e1 | 1199 | genpd->status = GENPD_STATE_ON; |
802d8b49 RW |
1200 | } |
1201 | ||
596ba34b | 1202 | /** |
9e9704ea | 1203 | * genpd_prepare - Start power transition of a device in a PM domain. |
596ba34b RW |
1204 | * @dev: Device to start the transition of. |
1205 | * | |
1206 | * Start a power transition of a device (during a system-wide power transition) | |
1207 | * under the assumption that its pm_domain field points to the domain member of | |
1208 | * an object of type struct generic_pm_domain representing a PM domain | |
1209 | * consisting of I/O devices. | |
1210 | */ | |
9e9704ea | 1211 | static int genpd_prepare(struct device *dev) |
596ba34b RW |
1212 | { |
1213 | struct generic_pm_domain *genpd; | |
b6c10c84 | 1214 | int ret; |
596ba34b RW |
1215 | |
1216 | dev_dbg(dev, "%s()\n", __func__); | |
1217 | ||
1218 | genpd = dev_to_genpd(dev); | |
1219 | if (IS_ERR(genpd)) | |
1220 | return -EINVAL; | |
1221 | ||
35241d12 | 1222 | genpd_lock(genpd); |
596ba34b | 1223 | |
39dd0f23 | 1224 | if (genpd->prepared_count++ == 0) |
65533bbf | 1225 | genpd->suspended_count = 0; |
17b75eca | 1226 | |
35241d12 | 1227 | genpd_unlock(genpd); |
596ba34b | 1228 | |
b6c10c84 | 1229 | ret = pm_generic_prepare(dev); |
5241ab40 | 1230 | if (ret < 0) { |
35241d12 | 1231 | genpd_lock(genpd); |
b6c10c84 | 1232 | |
39dd0f23 | 1233 | genpd->prepared_count--; |
b6c10c84 | 1234 | |
35241d12 | 1235 | genpd_unlock(genpd); |
b6c10c84 | 1236 | } |
17b75eca | 1237 | |
5241ab40 UH |
1238 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
1239 | return ret >= 0 ? 0 : ret; | |
596ba34b RW |
1240 | } |
1241 | ||
0496c8ae | 1242 | /** |
10da6542 MP |
1243 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
1244 | * I/O pm domain. | |
0496c8ae | 1245 | * @dev: Device to suspend. |
615db6d9 SG |
1246 | * @suspend_noirq: Generic suspend_noirq callback. |
1247 | * @resume_noirq: Generic resume_noirq callback. | |
0496c8ae RW |
1248 | * |
1249 | * Stop the device and remove power from the domain if all devices in it have | |
1250 | * been stopped. | |
1251 | */ | |
615db6d9 SG |
1252 | static int genpd_finish_suspend(struct device *dev, |
1253 | int (*suspend_noirq)(struct device *dev), | |
1254 | int (*resume_noirq)(struct device *dev)) | |
0496c8ae RW |
1255 | { |
1256 | struct generic_pm_domain *genpd; | |
a935424b | 1257 | int ret = 0; |
0496c8ae | 1258 | |
0496c8ae RW |
1259 | genpd = dev_to_genpd(dev); |
1260 | if (IS_ERR(genpd)) | |
1261 | return -EINVAL; | |
596ba34b | 1262 | |
615db6d9 | 1263 | ret = suspend_noirq(dev); |
10da6542 MP |
1264 | if (ret) |
1265 | return ret; | |
1266 | ||
4e1d9a73 | 1267 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
a935424b UH |
1268 | return 0; |
1269 | ||
17218e00 RW |
1270 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1271 | !pm_runtime_status_suspended(dev)) { | |
1272 | ret = genpd_stop_dev(genpd, dev); | |
a935424b | 1273 | if (ret) { |
615db6d9 | 1274 | resume_noirq(dev); |
122a2237 | 1275 | return ret; |
a935424b | 1276 | } |
122a2237 UH |
1277 | } |
1278 | ||
0883ac03 | 1279 | genpd_lock(genpd); |
596ba34b | 1280 | genpd->suspended_count++; |
0883ac03 UH |
1281 | genpd_sync_power_off(genpd, true, 0); |
1282 | genpd_unlock(genpd); | |
596ba34b RW |
1283 | |
1284 | return 0; | |
1285 | } | |
1286 | ||
10da6542 | 1287 | /** |
9e9704ea | 1288 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
10da6542 MP |
1289 | * @dev: Device to suspend. |
1290 | * | |
1291 | * Stop the device and remove power from the domain if all devices in it have | |
1292 | * been stopped. | |
1293 | */ | |
9e9704ea | 1294 | static int genpd_suspend_noirq(struct device *dev) |
10da6542 MP |
1295 | { |
1296 | dev_dbg(dev, "%s()\n", __func__); | |
1297 | ||
615db6d9 SG |
1298 | return genpd_finish_suspend(dev, |
1299 | pm_generic_suspend_noirq, | |
1300 | pm_generic_resume_noirq); | |
10da6542 MP |
1301 | } |
1302 | ||
596ba34b | 1303 | /** |
d9cc34fe | 1304 | * genpd_finish_resume - Completion of resume of device in an I/O PM domain. |
596ba34b | 1305 | * @dev: Device to resume. |
d9cc34fe | 1306 | * @resume_noirq: Generic resume_noirq callback. |
596ba34b | 1307 | * |
0496c8ae | 1308 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b | 1309 | */ |
d9cc34fe SG |
1310 | static int genpd_finish_resume(struct device *dev, |
1311 | int (*resume_noirq)(struct device *dev)) | |
596ba34b RW |
1312 | { |
1313 | struct generic_pm_domain *genpd; | |
a935424b | 1314 | int ret; |
596ba34b RW |
1315 | |
1316 | dev_dbg(dev, "%s()\n", __func__); | |
1317 | ||
1318 | genpd = dev_to_genpd(dev); | |
1319 | if (IS_ERR(genpd)) | |
1320 | return -EINVAL; | |
1321 | ||
4e1d9a73 | 1322 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
d9cc34fe | 1323 | return resume_noirq(dev); |
596ba34b | 1324 | |
0883ac03 UH |
1325 | genpd_lock(genpd); |
1326 | genpd_sync_power_on(genpd, true, 0); | |
596ba34b | 1327 | genpd->suspended_count--; |
0883ac03 | 1328 | genpd_unlock(genpd); |
596ba34b | 1329 | |
17218e00 RW |
1330 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
1331 | !pm_runtime_status_suspended(dev)) { | |
1332 | ret = genpd_start_dev(genpd, dev); | |
a935424b UH |
1333 | if (ret) |
1334 | return ret; | |
1335 | } | |
122a2237 | 1336 | |
a935424b | 1337 | return pm_generic_resume_noirq(dev); |
596ba34b RW |
1338 | } |
1339 | ||
d9cc34fe SG |
1340 | /** |
1341 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. | |
1342 | * @dev: Device to resume. | |
1343 | * | |
1344 | * Restore power to the device's PM domain, if necessary, and start the device. | |
1345 | */ | |
1346 | static int genpd_resume_noirq(struct device *dev) | |
1347 | { | |
1348 | dev_dbg(dev, "%s()\n", __func__); | |
1349 | ||
1350 | return genpd_finish_resume(dev, pm_generic_resume_noirq); | |
1351 | } | |
1352 | ||
0496c8ae | 1353 | /** |
9e9704ea | 1354 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
596ba34b RW |
1355 | * @dev: Device to freeze. |
1356 | * | |
1357 | * Carry out a late freeze of a device under the assumption that its | |
1358 | * pm_domain field points to the domain member of an object of type | |
1359 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1360 | * devices. | |
1361 | */ | |
9e9704ea | 1362 | static int genpd_freeze_noirq(struct device *dev) |
596ba34b | 1363 | { |
596ba34b RW |
1364 | dev_dbg(dev, "%s()\n", __func__); |
1365 | ||
ebb486be SG |
1366 | return genpd_finish_suspend(dev, |
1367 | pm_generic_freeze_noirq, | |
1368 | pm_generic_thaw_noirq); | |
0496c8ae | 1369 | } |
596ba34b | 1370 | |
0496c8ae | 1371 | /** |
9e9704ea | 1372 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
0496c8ae RW |
1373 | * @dev: Device to thaw. |
1374 | * | |
1375 | * Start the device, unless power has been removed from the domain already | |
1376 | * before the system transition. | |
1377 | */ | |
9e9704ea | 1378 | static int genpd_thaw_noirq(struct device *dev) |
0496c8ae | 1379 | { |
0496c8ae | 1380 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1381 | |
ebb486be | 1382 | return genpd_finish_resume(dev, pm_generic_thaw_noirq); |
10da6542 MP |
1383 | } |
1384 | ||
1385 | /** | |
9e9704ea | 1386 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
10da6542 MP |
1387 | * I/O PM domain. |
1388 | * @dev: Device to poweroff. | |
1389 | * | |
1390 | * Stop the device and remove power from the domain if all devices in it have | |
1391 | * been stopped. | |
1392 | */ | |
9e9704ea | 1393 | static int genpd_poweroff_noirq(struct device *dev) |
10da6542 MP |
1394 | { |
1395 | dev_dbg(dev, "%s()\n", __func__); | |
1396 | ||
615db6d9 SG |
1397 | return genpd_finish_suspend(dev, |
1398 | pm_generic_poweroff_noirq, | |
1399 | pm_generic_restore_noirq); | |
596ba34b RW |
1400 | } |
1401 | ||
596ba34b | 1402 | /** |
9e9704ea | 1403 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1404 | * @dev: Device to resume. |
1405 | * | |
0496c8ae RW |
1406 | * Make sure the domain will be in the same power state as before the |
1407 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b | 1408 | */ |
9e9704ea | 1409 | static int genpd_restore_noirq(struct device *dev) |
596ba34b | 1410 | { |
596ba34b RW |
1411 | dev_dbg(dev, "%s()\n", __func__); |
1412 | ||
d9cc34fe | 1413 | return genpd_finish_resume(dev, pm_generic_restore_noirq); |
596ba34b RW |
1414 | } |
1415 | ||
1416 | /** | |
9e9704ea | 1417 | * genpd_complete - Complete power transition of a device in a power domain. |
596ba34b RW |
1418 | * @dev: Device to complete the transition of. |
1419 | * | |
1420 | * Complete a power transition of a device (during a system-wide power | |
1421 | * transition) under the assumption that its pm_domain field points to the | |
1422 | * domain member of an object of type struct generic_pm_domain representing | |
1423 | * a power domain consisting of I/O devices. | |
1424 | */ | |
9e9704ea | 1425 | static void genpd_complete(struct device *dev) |
596ba34b RW |
1426 | { |
1427 | struct generic_pm_domain *genpd; | |
596ba34b RW |
1428 | |
1429 | dev_dbg(dev, "%s()\n", __func__); | |
1430 | ||
1431 | genpd = dev_to_genpd(dev); | |
1432 | if (IS_ERR(genpd)) | |
1433 | return; | |
1434 | ||
4d23a5e8 UH |
1435 | pm_generic_complete(dev); |
1436 | ||
35241d12 | 1437 | genpd_lock(genpd); |
596ba34b | 1438 | |
39dd0f23 | 1439 | genpd->prepared_count--; |
4d23a5e8 UH |
1440 | if (!genpd->prepared_count) |
1441 | genpd_queue_power_off_work(genpd); | |
596ba34b | 1442 | |
35241d12 | 1443 | genpd_unlock(genpd); |
596ba34b RW |
1444 | } |
1445 | ||
fc519890 | 1446 | static void genpd_switch_state(struct device *dev, bool suspend) |
77f827de RW |
1447 | { |
1448 | struct generic_pm_domain *genpd; | |
b9795a3e | 1449 | bool use_lock; |
77f827de | 1450 | |
fe0c2baa UH |
1451 | genpd = dev_to_genpd_safe(dev); |
1452 | if (!genpd) | |
77f827de RW |
1453 | return; |
1454 | ||
b9795a3e UH |
1455 | use_lock = genpd_is_irq_safe(genpd); |
1456 | ||
1457 | if (use_lock) | |
1458 | genpd_lock(genpd); | |
1459 | ||
77f827de RW |
1460 | if (suspend) { |
1461 | genpd->suspended_count++; | |
b9795a3e | 1462 | genpd_sync_power_off(genpd, use_lock, 0); |
77f827de | 1463 | } else { |
b9795a3e | 1464 | genpd_sync_power_on(genpd, use_lock, 0); |
77f827de RW |
1465 | genpd->suspended_count--; |
1466 | } | |
b9795a3e UH |
1467 | |
1468 | if (use_lock) | |
1469 | genpd_unlock(genpd); | |
77f827de | 1470 | } |
d47e6464 | 1471 | |
fc519890 UH |
1472 | /** |
1473 | * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev | |
1474 | * @dev: The device that is attached to the genpd, that can be suspended. | |
1475 | * | |
1476 | * This routine should typically be called for a device that needs to be | |
b9795a3e UH |
1477 | * suspended during the syscore suspend phase. It may also be called during |
1478 | * suspend-to-idle to suspend a corresponding CPU device that is attached to a | |
1479 | * genpd. | |
fc519890 UH |
1480 | */ |
1481 | void dev_pm_genpd_suspend(struct device *dev) | |
d47e6464 | 1482 | { |
fc519890 | 1483 | genpd_switch_state(dev, true); |
d47e6464 | 1484 | } |
fc519890 | 1485 | EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); |
d47e6464 | 1486 | |
fc519890 UH |
1487 | /** |
1488 | * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev | |
1489 | * @dev: The device that is attached to the genpd, which needs to be resumed. | |
1490 | * | |
1491 | * This routine should typically be called for a device that needs to be resumed | |
b9795a3e UH |
1492 | * during the syscore resume phase. It may also be called during suspend-to-idle |
1493 | * to resume a corresponding CPU device that is attached to a genpd. | |
fc519890 UH |
1494 | */ |
1495 | void dev_pm_genpd_resume(struct device *dev) | |
d47e6464 | 1496 | { |
fc519890 | 1497 | genpd_switch_state(dev, false); |
d47e6464 | 1498 | } |
fc519890 | 1499 | EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); |
77f827de | 1500 | |
d30d819d | 1501 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b | 1502 | |
9e9704ea UH |
1503 | #define genpd_prepare NULL |
1504 | #define genpd_suspend_noirq NULL | |
1505 | #define genpd_resume_noirq NULL | |
1506 | #define genpd_freeze_noirq NULL | |
1507 | #define genpd_thaw_noirq NULL | |
1508 | #define genpd_poweroff_noirq NULL | |
1509 | #define genpd_restore_noirq NULL | |
1510 | #define genpd_complete NULL | |
596ba34b RW |
1511 | |
1512 | #endif /* CONFIG_PM_SLEEP */ | |
1513 | ||
66d29d80 UH |
1514 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1515 | bool has_governor) | |
1d5fcfec RW |
1516 | { |
1517 | struct generic_pm_domain_data *gpd_data; | |
66d29d80 | 1518 | struct gpd_timing_data *td; |
3e235685 UH |
1519 | int ret; |
1520 | ||
1521 | ret = dev_pm_get_subsys_data(dev); | |
1522 | if (ret) | |
1523 | return ERR_PTR(ret); | |
1d5fcfec RW |
1524 | |
1525 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1526 | if (!gpd_data) { |
1527 | ret = -ENOMEM; | |
1528 | goto err_put; | |
1529 | } | |
1d5fcfec | 1530 | |
f104e1e5 | 1531 | gpd_data->base.dev = dev; |
f104e1e5 UH |
1532 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1533 | ||
66d29d80 UH |
1534 | /* Allocate data used by a governor. */ |
1535 | if (has_governor) { | |
1536 | td = kzalloc(sizeof(*td), GFP_KERNEL); | |
1537 | if (!td) { | |
1538 | ret = -ENOMEM; | |
1539 | goto err_free; | |
1540 | } | |
f104e1e5 | 1541 | |
66d29d80 UH |
1542 | td->constraint_changed = true; |
1543 | td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; | |
9c74f2ac | 1544 | td->next_wakeup = KTIME_MAX; |
66d29d80 | 1545 | gpd_data->td = td; |
f104e1e5 UH |
1546 | } |
1547 | ||
66d29d80 UH |
1548 | spin_lock_irq(&dev->power.lock); |
1549 | ||
1550 | if (dev->power.subsys_data->domain_data) | |
1551 | ret = -EINVAL; | |
1552 | else | |
1553 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
f104e1e5 UH |
1554 | |
1555 | spin_unlock_irq(&dev->power.lock); | |
1556 | ||
66d29d80 UH |
1557 | if (ret) |
1558 | goto err_free; | |
1559 | ||
1d5fcfec | 1560 | return gpd_data; |
3e235685 | 1561 | |
f104e1e5 | 1562 | err_free: |
66d29d80 | 1563 | kfree(gpd_data->td); |
f104e1e5 | 1564 | kfree(gpd_data); |
3e235685 UH |
1565 | err_put: |
1566 | dev_pm_put_subsys_data(dev); | |
1567 | return ERR_PTR(ret); | |
1d5fcfec RW |
1568 | } |
1569 | ||
49d400c7 UH |
1570 | static void genpd_free_dev_data(struct device *dev, |
1571 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1572 | { |
f104e1e5 UH |
1573 | spin_lock_irq(&dev->power.lock); |
1574 | ||
f104e1e5 UH |
1575 | dev->power.subsys_data->domain_data = NULL; |
1576 | ||
1577 | spin_unlock_irq(&dev->power.lock); | |
1578 | ||
66d29d80 | 1579 | kfree(gpd_data->td); |
1d5fcfec | 1580 | kfree(gpd_data); |
3e235685 | 1581 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1582 | } |
1583 | ||
b24e1965 UH |
1584 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
1585 | int cpu, bool set, unsigned int depth) | |
eb594b73 UH |
1586 | { |
1587 | struct gpd_link *link; | |
1588 | ||
1589 | if (!genpd_is_cpu_domain(genpd)) | |
1590 | return; | |
1591 | ||
8d87ae48 KC |
1592 | list_for_each_entry(link, &genpd->child_links, child_node) { |
1593 | struct generic_pm_domain *parent = link->parent; | |
eb594b73 | 1594 | |
8d87ae48 KC |
1595 | genpd_lock_nested(parent, depth + 1); |
1596 | genpd_update_cpumask(parent, cpu, set, depth + 1); | |
1597 | genpd_unlock(parent); | |
eb594b73 UH |
1598 | } |
1599 | ||
1600 | if (set) | |
1601 | cpumask_set_cpu(cpu, genpd->cpus); | |
1602 | else | |
1603 | cpumask_clear_cpu(cpu, genpd->cpus); | |
1604 | } | |
1605 | ||
b24e1965 UH |
1606 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
1607 | { | |
1608 | if (cpu >= 0) | |
1609 | genpd_update_cpumask(genpd, cpu, true, 0); | |
1610 | } | |
1611 | ||
1612 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) | |
1613 | { | |
1614 | if (cpu >= 0) | |
1615 | genpd_update_cpumask(genpd, cpu, false, 0); | |
1616 | } | |
1617 | ||
1618 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) | |
eb594b73 UH |
1619 | { |
1620 | int cpu; | |
1621 | ||
1622 | if (!genpd_is_cpu_domain(genpd)) | |
b24e1965 | 1623 | return -1; |
eb594b73 UH |
1624 | |
1625 | for_each_possible_cpu(cpu) { | |
b24e1965 UH |
1626 | if (get_cpu_device(cpu) == dev) |
1627 | return cpu; | |
eb594b73 | 1628 | } |
eb594b73 | 1629 | |
b24e1965 | 1630 | return -1; |
eb594b73 UH |
1631 | } |
1632 | ||
f9ccd7c3 UH |
1633 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1634 | struct device *base_dev) | |
f721889f | 1635 | { |
f38d1a6d | 1636 | struct genpd_governor_data *gd = genpd->gd; |
c0356db7 | 1637 | struct generic_pm_domain_data *gpd_data; |
f9ccd7c3 | 1638 | int ret; |
f721889f RW |
1639 | |
1640 | dev_dbg(dev, "%s()\n", __func__); | |
1641 | ||
f38d1a6d | 1642 | gpd_data = genpd_alloc_dev_data(dev, gd); |
3e235685 UH |
1643 | if (IS_ERR(gpd_data)) |
1644 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1645 | |
f9ccd7c3 | 1646 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
b24e1965 | 1647 | |
b472c2fa UH |
1648 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1649 | if (ret) | |
1650 | goto out; | |
d79b6fe1 | 1651 | |
2071ac98 JW |
1652 | genpd_lock(genpd); |
1653 | ||
f9ccd7c3 | 1654 | genpd_set_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1655 | dev_pm_domain_set(dev, &genpd->domain); |
1656 | ||
14b53064 | 1657 | genpd->device_count++; |
f38d1a6d UH |
1658 | if (gd) |
1659 | gd->max_off_time_changed = true; | |
14b53064 | 1660 | |
1d5fcfec | 1661 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1662 | |
35241d12 | 1663 | genpd_unlock(genpd); |
2071ac98 | 1664 | out: |
c0356db7 UH |
1665 | if (ret) |
1666 | genpd_free_dev_data(dev, gpd_data); | |
1667 | else | |
0b07ee94 VK |
1668 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
1669 | DEV_PM_QOS_RESUME_LATENCY); | |
1d5fcfec | 1670 | |
f721889f RW |
1671 | return ret; |
1672 | } | |
19efa5ff JH |
1673 | |
1674 | /** | |
1a7a6707 | 1675 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
19efa5ff JH |
1676 | * @genpd: PM domain to add the device to. |
1677 | * @dev: Device to be added. | |
19efa5ff | 1678 | */ |
1a7a6707 | 1679 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
19efa5ff JH |
1680 | { |
1681 | int ret; | |
1682 | ||
4384a70c UH |
1683 | if (!genpd || !dev) |
1684 | return -EINVAL; | |
1685 | ||
19efa5ff | 1686 | mutex_lock(&gpd_list_lock); |
f9ccd7c3 | 1687 | ret = genpd_add_device(genpd, dev, dev); |
19efa5ff JH |
1688 | mutex_unlock(&gpd_list_lock); |
1689 | ||
1690 | return ret; | |
1691 | } | |
1a7a6707 | 1692 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
f721889f | 1693 | |
85168d56 UH |
1694 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
1695 | struct device *dev) | |
f721889f | 1696 | { |
6ff7bb0d | 1697 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1698 | struct pm_domain_data *pdd; |
f9ccd7c3 | 1699 | int ret = 0; |
f721889f RW |
1700 | |
1701 | dev_dbg(dev, "%s()\n", __func__); | |
1702 | ||
c0356db7 UH |
1703 | pdd = dev->power.subsys_data->domain_data; |
1704 | gpd_data = to_gpd_data(pdd); | |
0b07ee94 VK |
1705 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
1706 | DEV_PM_QOS_RESUME_LATENCY); | |
c0356db7 | 1707 | |
35241d12 | 1708 | genpd_lock(genpd); |
f721889f | 1709 | |
596ba34b RW |
1710 | if (genpd->prepared_count > 0) { |
1711 | ret = -EAGAIN; | |
1712 | goto out; | |
1713 | } | |
1714 | ||
6ff7bb0d | 1715 | genpd->device_count--; |
f38d1a6d UH |
1716 | if (genpd->gd) |
1717 | genpd->gd->max_off_time_changed = true; | |
6ff7bb0d | 1718 | |
f9ccd7c3 | 1719 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
975e83cf SH |
1720 | dev_pm_domain_set(dev, NULL); |
1721 | ||
efa69025 | 1722 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1723 | |
35241d12 | 1724 | genpd_unlock(genpd); |
6ff7bb0d | 1725 | |
2071ac98 JW |
1726 | if (genpd->detach_dev) |
1727 | genpd->detach_dev(genpd, dev); | |
1728 | ||
c1dbe2fb | 1729 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1730 | |
6ff7bb0d | 1731 | return 0; |
f721889f | 1732 | |
596ba34b | 1733 | out: |
35241d12 | 1734 | genpd_unlock(genpd); |
0b07ee94 | 1735 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
f721889f RW |
1736 | |
1737 | return ret; | |
1738 | } | |
85168d56 UH |
1739 | |
1740 | /** | |
1741 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
85168d56 UH |
1742 | * @dev: Device to be removed. |
1743 | */ | |
924f4486 | 1744 | int pm_genpd_remove_device(struct device *dev) |
85168d56 | 1745 | { |
b3ad17c0 | 1746 | struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
924f4486 UH |
1747 | |
1748 | if (!genpd) | |
85168d56 UH |
1749 | return -EINVAL; |
1750 | ||
1751 | return genpd_remove_device(genpd, dev); | |
1752 | } | |
24c96dc7 | 1753 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
f721889f | 1754 | |
d4f81383 UH |
1755 | /** |
1756 | * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev | |
1757 | * | |
1758 | * @dev: Device that should be associated with the notifier | |
1759 | * @nb: The notifier block to register | |
1760 | * | |
1761 | * Users may call this function to add a genpd power on/off notifier for an | |
1762 | * attached @dev. Only one notifier per device is allowed. The notifier is | |
1763 | * sent when genpd is powering on/off the PM domain. | |
1764 | * | |
1765 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1766 | * while this routine is getting called. | |
1767 | * | |
1768 | * Returns 0 on success and negative error values on failures. | |
1769 | */ | |
1770 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) | |
1771 | { | |
1772 | struct generic_pm_domain *genpd; | |
1773 | struct generic_pm_domain_data *gpd_data; | |
1774 | int ret; | |
1775 | ||
1776 | genpd = dev_to_genpd_safe(dev); | |
1777 | if (!genpd) | |
1778 | return -ENODEV; | |
1779 | ||
1780 | if (WARN_ON(!dev->power.subsys_data || | |
1781 | !dev->power.subsys_data->domain_data)) | |
1782 | return -EINVAL; | |
1783 | ||
1784 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1785 | if (gpd_data->power_nb) | |
1786 | return -EEXIST; | |
1787 | ||
1788 | genpd_lock(genpd); | |
1789 | ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); | |
1790 | genpd_unlock(genpd); | |
1791 | ||
1792 | if (ret) { | |
1793 | dev_warn(dev, "failed to add notifier for PM domain %s\n", | |
1794 | genpd->name); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | gpd_data->power_nb = nb; | |
1799 | return 0; | |
1800 | } | |
1801 | EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); | |
1802 | ||
1803 | /** | |
1804 | * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev | |
1805 | * | |
1806 | * @dev: Device that is associated with the notifier | |
1807 | * | |
1808 | * Users may call this function to remove a genpd power on/off notifier for an | |
1809 | * attached @dev. | |
1810 | * | |
1811 | * It is assumed that the user guarantee that the genpd wouldn't be detached | |
1812 | * while this routine is getting called. | |
1813 | * | |
1814 | * Returns 0 on success and negative error values on failures. | |
1815 | */ | |
1816 | int dev_pm_genpd_remove_notifier(struct device *dev) | |
1817 | { | |
1818 | struct generic_pm_domain *genpd; | |
1819 | struct generic_pm_domain_data *gpd_data; | |
1820 | int ret; | |
1821 | ||
1822 | genpd = dev_to_genpd_safe(dev); | |
1823 | if (!genpd) | |
1824 | return -ENODEV; | |
1825 | ||
1826 | if (WARN_ON(!dev->power.subsys_data || | |
1827 | !dev->power.subsys_data->domain_data)) | |
1828 | return -EINVAL; | |
1829 | ||
1830 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
1831 | if (!gpd_data->power_nb) | |
1832 | return -ENODEV; | |
1833 | ||
1834 | genpd_lock(genpd); | |
1835 | ret = raw_notifier_chain_unregister(&genpd->power_notifiers, | |
1836 | gpd_data->power_nb); | |
1837 | genpd_unlock(genpd); | |
1838 | ||
1839 | if (ret) { | |
1840 | dev_warn(dev, "failed to remove notifier for PM domain %s\n", | |
1841 | genpd->name); | |
1842 | return ret; | |
1843 | } | |
1844 | ||
1845 | gpd_data->power_nb = NULL; | |
1846 | return 0; | |
1847 | } | |
1848 | EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); | |
1849 | ||
19efa5ff JH |
1850 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
1851 | struct generic_pm_domain *subdomain) | |
f721889f | 1852 | { |
2547923d | 1853 | struct gpd_link *link, *itr; |
f721889f RW |
1854 | int ret = 0; |
1855 | ||
fb7268be RW |
1856 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1857 | || genpd == subdomain) | |
f721889f RW |
1858 | return -EINVAL; |
1859 | ||
d716f479 LI |
1860 | /* |
1861 | * If the domain can be powered on/off in an IRQ safe | |
1862 | * context, ensure that the subdomain can also be | |
1863 | * powered on/off in that context. | |
1864 | */ | |
1865 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { | |
44cae7d5 | 1866 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
d716f479 LI |
1867 | genpd->name, subdomain->name); |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
2547923d LI |
1871 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1872 | if (!link) | |
1873 | return -ENOMEM; | |
1874 | ||
35241d12 LI |
1875 | genpd_lock(subdomain); |
1876 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1877 | |
41e2c8e0 | 1878 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
f721889f RW |
1879 | ret = -EINVAL; |
1880 | goto out; | |
1881 | } | |
1882 | ||
8d87ae48 KC |
1883 | list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
1884 | if (itr->child == subdomain && itr->parent == genpd) { | |
f721889f RW |
1885 | ret = -EINVAL; |
1886 | goto out; | |
1887 | } | |
1888 | } | |
1889 | ||
8d87ae48 KC |
1890 | link->parent = genpd; |
1891 | list_add_tail(&link->parent_node, &genpd->parent_links); | |
1892 | link->child = subdomain; | |
1893 | list_add_tail(&link->child_node, &subdomain->child_links); | |
41e2c8e0 | 1894 | if (genpd_status_on(subdomain)) |
c4bb3160 | 1895 | genpd_sd_counter_inc(genpd); |
f721889f | 1896 | |
f721889f | 1897 | out: |
35241d12 LI |
1898 | genpd_unlock(genpd); |
1899 | genpd_unlock(subdomain); | |
2547923d LI |
1900 | if (ret) |
1901 | kfree(link); | |
f721889f RW |
1902 | return ret; |
1903 | } | |
19efa5ff JH |
1904 | |
1905 | /** | |
1906 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
8d87ae48 | 1907 | * @genpd: Leader PM domain to add the subdomain to. |
19efa5ff JH |
1908 | * @subdomain: Subdomain to be added. |
1909 | */ | |
1910 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
1911 | struct generic_pm_domain *subdomain) | |
1912 | { | |
1913 | int ret; | |
1914 | ||
1915 | mutex_lock(&gpd_list_lock); | |
1916 | ret = genpd_add_subdomain(genpd, subdomain); | |
1917 | mutex_unlock(&gpd_list_lock); | |
1918 | ||
1919 | return ret; | |
1920 | } | |
d60ee966 | 1921 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
f721889f RW |
1922 | |
1923 | /** | |
1924 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
8d87ae48 | 1925 | * @genpd: Leader PM domain to remove the subdomain from. |
5063ce15 | 1926 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1927 | */ |
1928 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1929 | struct generic_pm_domain *subdomain) |
f721889f | 1930 | { |
c6e83cac | 1931 | struct gpd_link *l, *link; |
f721889f RW |
1932 | int ret = -EINVAL; |
1933 | ||
5063ce15 | 1934 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1935 | return -EINVAL; |
1936 | ||
35241d12 LI |
1937 | genpd_lock(subdomain); |
1938 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); | |
f721889f | 1939 | |
8d87ae48 | 1940 | if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
7a5bd127 JP |
1941 | pr_warn("%s: unable to remove subdomain %s\n", |
1942 | genpd->name, subdomain->name); | |
30e7a65b JH |
1943 | ret = -EBUSY; |
1944 | goto out; | |
1945 | } | |
1946 | ||
8d87ae48 KC |
1947 | list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
1948 | if (link->child != subdomain) | |
f721889f RW |
1949 | continue; |
1950 | ||
8d87ae48 KC |
1951 | list_del(&link->parent_node); |
1952 | list_del(&link->child_node); | |
5063ce15 | 1953 | kfree(link); |
41e2c8e0 | 1954 | if (genpd_status_on(subdomain)) |
f721889f RW |
1955 | genpd_sd_counter_dec(genpd); |
1956 | ||
f721889f RW |
1957 | ret = 0; |
1958 | break; | |
1959 | } | |
1960 | ||
30e7a65b | 1961 | out: |
35241d12 LI |
1962 | genpd_unlock(genpd); |
1963 | genpd_unlock(subdomain); | |
f721889f RW |
1964 | |
1965 | return ret; | |
1966 | } | |
d60ee966 | 1967 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
f721889f | 1968 | |
49a27e27 UH |
1969 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
1970 | unsigned int state_count) | |
1971 | { | |
1972 | kfree(states); | |
1973 | } | |
1974 | ||
59d65b73 LI |
1975 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
1976 | { | |
1977 | struct genpd_power_state *state; | |
1978 | ||
1979 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
1980 | if (!state) | |
1981 | return -ENOMEM; | |
1982 | ||
1983 | genpd->states = state; | |
1984 | genpd->state_count = 1; | |
49a27e27 | 1985 | genpd->free_states = genpd_free_default_power_state; |
59d65b73 LI |
1986 | |
1987 | return 0; | |
1988 | } | |
1989 | ||
ba43d6db UH |
1990 | static int genpd_alloc_data(struct generic_pm_domain *genpd) |
1991 | { | |
f38d1a6d | 1992 | struct genpd_governor_data *gd = NULL; |
ba43d6db UH |
1993 | int ret; |
1994 | ||
1995 | if (genpd_is_cpu_domain(genpd) && | |
1996 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) | |
1997 | return -ENOMEM; | |
1998 | ||
f38d1a6d UH |
1999 | if (genpd->gov) { |
2000 | gd = kzalloc(sizeof(*gd), GFP_KERNEL); | |
2001 | if (!gd) { | |
2002 | ret = -ENOMEM; | |
2003 | goto free; | |
2004 | } | |
2005 | ||
2006 | gd->max_off_time_ns = -1; | |
2007 | gd->max_off_time_changed = true; | |
2008 | gd->next_wakeup = KTIME_MAX; | |
1498c503 | 2009 | gd->next_hrtimer = KTIME_MAX; |
f38d1a6d UH |
2010 | } |
2011 | ||
ba43d6db UH |
2012 | /* Use only one "off" state if there were no states declared */ |
2013 | if (genpd->state_count == 0) { | |
2014 | ret = genpd_set_default_power_state(genpd); | |
2015 | if (ret) | |
2016 | goto free; | |
2017 | } | |
2018 | ||
f38d1a6d | 2019 | genpd->gd = gd; |
ba43d6db UH |
2020 | return 0; |
2021 | ||
2022 | free: | |
2023 | if (genpd_is_cpu_domain(genpd)) | |
2024 | free_cpumask_var(genpd->cpus); | |
f38d1a6d | 2025 | kfree(gd); |
ba43d6db UH |
2026 | return ret; |
2027 | } | |
2028 | ||
2029 | static void genpd_free_data(struct generic_pm_domain *genpd) | |
2030 | { | |
2031 | if (genpd_is_cpu_domain(genpd)) | |
2032 | free_cpumask_var(genpd->cpus); | |
2033 | if (genpd->free_states) | |
2034 | genpd->free_states(genpd->states, genpd->state_count); | |
f38d1a6d | 2035 | kfree(genpd->gd); |
ba43d6db UH |
2036 | } |
2037 | ||
d716f479 LI |
2038 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
2039 | { | |
2040 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { | |
2041 | spin_lock_init(&genpd->slock); | |
2042 | genpd->lock_ops = &genpd_spin_ops; | |
2043 | } else { | |
2044 | mutex_init(&genpd->mlock); | |
2045 | genpd->lock_ops = &genpd_mtx_ops; | |
2046 | } | |
2047 | } | |
2048 | ||
f721889f RW |
2049 | /** |
2050 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
2051 | * @genpd: PM domain object to initialize. | |
2052 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
2053 | * @is_off: Initial value of the domain's power_is_off field. | |
7eb231c3 UH |
2054 | * |
2055 | * Returns 0 on successful initialization, else a negative error code. | |
f721889f | 2056 | */ |
7eb231c3 UH |
2057 | int pm_genpd_init(struct generic_pm_domain *genpd, |
2058 | struct dev_power_governor *gov, bool is_off) | |
f721889f | 2059 | { |
59d65b73 LI |
2060 | int ret; |
2061 | ||
f721889f | 2062 | if (IS_ERR_OR_NULL(genpd)) |
7eb231c3 | 2063 | return -EINVAL; |
f721889f | 2064 | |
8d87ae48 KC |
2065 | INIT_LIST_HEAD(&genpd->parent_links); |
2066 | INIT_LIST_HEAD(&genpd->child_links); | |
f721889f | 2067 | INIT_LIST_HEAD(&genpd->dev_list); |
d4f81383 | 2068 | RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
d716f479 | 2069 | genpd_lock_init(genpd); |
f721889f RW |
2070 | genpd->gov = gov; |
2071 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 2072 | atomic_set(&genpd->sd_count, 0); |
49f618e1 | 2073 | genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
596ba34b | 2074 | genpd->device_count = 0; |
de0aa06d JH |
2075 | genpd->provider = NULL; |
2076 | genpd->has_provider = false; | |
bd40cbb0 | 2077 | genpd->accounting_time = ktime_get_mono_fast_ns(); |
795bd2e7 UH |
2078 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
2079 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; | |
9e9704ea UH |
2080 | genpd->domain.ops.prepare = genpd_prepare; |
2081 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; | |
2082 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; | |
2083 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; | |
2084 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; | |
2085 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; | |
2086 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; | |
2087 | genpd->domain.ops.complete = genpd_complete; | |
ea71c596 | 2088 | genpd->domain.start = genpd_dev_pm_start; |
401e0920 | 2089 | genpd->domain.set_performance_state = genpd_dev_pm_set_performance_state; |
c11f6f5b UH |
2090 | |
2091 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
2092 | genpd->dev_ops.stop = pm_clk_suspend; | |
2093 | genpd->dev_ops.start = pm_clk_resume; | |
2094 | } | |
2095 | ||
27656dcd UH |
2096 | /* The always-on governor works better with the corresponding flag. */ |
2097 | if (gov == &pm_domain_always_on_gov) | |
2098 | genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; | |
2099 | ||
ffaa42e8 | 2100 | /* Always-on domains must be powered on at initialization. */ |
ed61e18a | 2101 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
129b60c9 JH |
2102 | !genpd_status_on(genpd)) { |
2103 | pr_err("always-on PM domain %s is not on\n", genpd->name); | |
ffaa42e8 | 2104 | return -EINVAL; |
129b60c9 | 2105 | } |
ffaa42e8 | 2106 | |
ba43d6db UH |
2107 | /* Multiple states but no governor doesn't make sense. */ |
2108 | if (!gov && genpd->state_count > 1) | |
7a5bd127 | 2109 | pr_warn("%s: no governor for states\n", genpd->name); |
ba43d6db UH |
2110 | |
2111 | ret = genpd_alloc_data(genpd); | |
2112 | if (ret) | |
2113 | return ret; | |
fc5cbf0c | 2114 | |
401ea157 VK |
2115 | device_initialize(&genpd->dev); |
2116 | dev_set_name(&genpd->dev, "%s", genpd->name); | |
2117 | ||
5125bbf3 RW |
2118 | mutex_lock(&gpd_list_lock); |
2119 | list_add(&genpd->gpd_list_node, &gpd_list); | |
2120 | mutex_unlock(&gpd_list_lock); | |
40ba55e4 | 2121 | genpd_debug_add(genpd); |
7eb231c3 UH |
2122 | |
2123 | return 0; | |
5125bbf3 | 2124 | } |
be5ed55d | 2125 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a | 2126 | |
3fe57710 JH |
2127 | static int genpd_remove(struct generic_pm_domain *genpd) |
2128 | { | |
2129 | struct gpd_link *l, *link; | |
2130 | ||
2131 | if (IS_ERR_OR_NULL(genpd)) | |
2132 | return -EINVAL; | |
2133 | ||
35241d12 | 2134 | genpd_lock(genpd); |
3fe57710 JH |
2135 | |
2136 | if (genpd->has_provider) { | |
35241d12 | 2137 | genpd_unlock(genpd); |
3fe57710 JH |
2138 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
2139 | return -EBUSY; | |
2140 | } | |
2141 | ||
8d87ae48 | 2142 | if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
35241d12 | 2143 | genpd_unlock(genpd); |
3fe57710 JH |
2144 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
2145 | return -EBUSY; | |
2146 | } | |
2147 | ||
8d87ae48 KC |
2148 | list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
2149 | list_del(&link->parent_node); | |
2150 | list_del(&link->child_node); | |
3fe57710 JH |
2151 | kfree(link); |
2152 | } | |
2153 | ||
2154 | list_del(&genpd->gpd_list_node); | |
35241d12 | 2155 | genpd_unlock(genpd); |
f6bfe8b5 | 2156 | genpd_debug_remove(genpd); |
3fe57710 | 2157 | cancel_work_sync(&genpd->power_off_work); |
ba43d6db | 2158 | genpd_free_data(genpd); |
49a27e27 | 2159 | |
3fe57710 JH |
2160 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
2161 | ||
2162 | return 0; | |
2163 | } | |
2164 | ||
2165 | /** | |
2166 | * pm_genpd_remove - Remove a generic I/O PM domain | |
2167 | * @genpd: Pointer to PM domain that is to be removed. | |
2168 | * | |
2169 | * To remove the PM domain, this function: | |
2170 | * - Removes the PM domain as a subdomain to any parent domains, | |
2171 | * if it was added. | |
2172 | * - Removes the PM domain from the list of registered PM domains. | |
2173 | * | |
2174 | * The PM domain will only be removed, if the associated provider has | |
2175 | * been removed, it is not a parent to any other PM domain and has no | |
2176 | * devices associated with it. | |
2177 | */ | |
2178 | int pm_genpd_remove(struct generic_pm_domain *genpd) | |
2179 | { | |
2180 | int ret; | |
2181 | ||
2182 | mutex_lock(&gpd_list_lock); | |
2183 | ret = genpd_remove(genpd); | |
2184 | mutex_unlock(&gpd_list_lock); | |
2185 | ||
2186 | return ret; | |
2187 | } | |
2188 | EXPORT_SYMBOL_GPL(pm_genpd_remove); | |
2189 | ||
aa42240a | 2190 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
892ebdcc | 2191 | |
aa42240a TF |
2192 | /* |
2193 | * Device Tree based PM domain providers. | |
2194 | * | |
2195 | * The code below implements generic device tree based PM domain providers that | |
2196 | * bind device tree nodes with generic PM domains registered in the system. | |
2197 | * | |
2198 | * Any driver that registers generic PM domains and needs to support binding of | |
2199 | * devices to these domains is supposed to register a PM domain provider, which | |
2200 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
2201 | * | |
2202 | * Two simple mapping functions have been provided for convenience: | |
892ebdcc JH |
2203 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
2204 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
aa42240a TF |
2205 | * index. |
2206 | */ | |
2207 | ||
2208 | /** | |
2209 | * struct of_genpd_provider - PM domain provider registration structure | |
2210 | * @link: Entry in global list of PM domain providers | |
2211 | * @node: Pointer to device tree node of PM domain provider | |
2212 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
2213 | * into a PM domain. | |
2214 | * @data: context pointer to be passed into @xlate callback | |
2215 | */ | |
2216 | struct of_genpd_provider { | |
2217 | struct list_head link; | |
2218 | struct device_node *node; | |
2219 | genpd_xlate_t xlate; | |
2220 | void *data; | |
2221 | }; | |
2222 | ||
2223 | /* List of registered PM domain providers. */ | |
2224 | static LIST_HEAD(of_genpd_providers); | |
2225 | /* Mutex to protect the list above. */ | |
2226 | static DEFINE_MUTEX(of_genpd_mutex); | |
2227 | ||
2228 | /** | |
892ebdcc | 2229 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
aa42240a TF |
2230 | * @genpdspec: OF phandle args to map into a PM domain |
2231 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
2232 | * | |
2233 | * This is a generic xlate function that can be used to model PM domains that | |
2234 | * have their own device tree nodes. The private data of xlate function needs | |
2235 | * to be a valid pointer to struct generic_pm_domain. | |
2236 | */ | |
892ebdcc | 2237 | static struct generic_pm_domain *genpd_xlate_simple( |
aa42240a TF |
2238 | struct of_phandle_args *genpdspec, |
2239 | void *data) | |
2240 | { | |
aa42240a TF |
2241 | return data; |
2242 | } | |
aa42240a TF |
2243 | |
2244 | /** | |
892ebdcc | 2245 | * genpd_xlate_onecell() - Xlate function using a single index. |
aa42240a TF |
2246 | * @genpdspec: OF phandle args to map into a PM domain |
2247 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
2248 | * | |
2249 | * This is a generic xlate function that can be used to model simple PM domain | |
2250 | * controllers that have one device tree node and provide multiple PM domains. | |
2251 | * A single cell is used as an index into an array of PM domains specified in | |
2252 | * the genpd_onecell_data struct when registering the provider. | |
2253 | */ | |
892ebdcc | 2254 | static struct generic_pm_domain *genpd_xlate_onecell( |
aa42240a TF |
2255 | struct of_phandle_args *genpdspec, |
2256 | void *data) | |
2257 | { | |
2258 | struct genpd_onecell_data *genpd_data = data; | |
2259 | unsigned int idx = genpdspec->args[0]; | |
2260 | ||
2261 | if (genpdspec->args_count != 1) | |
2262 | return ERR_PTR(-EINVAL); | |
2263 | ||
2264 | if (idx >= genpd_data->num_domains) { | |
2265 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
2266 | return ERR_PTR(-EINVAL); | |
2267 | } | |
2268 | ||
2269 | if (!genpd_data->domains[idx]) | |
2270 | return ERR_PTR(-ENOENT); | |
2271 | ||
2272 | return genpd_data->domains[idx]; | |
2273 | } | |
aa42240a TF |
2274 | |
2275 | /** | |
892ebdcc | 2276 | * genpd_add_provider() - Register a PM domain provider for a node |
aa42240a TF |
2277 | * @np: Device node pointer associated with the PM domain provider. |
2278 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
2279 | * @data: Context pointer for @xlate callback. | |
2280 | */ | |
892ebdcc JH |
2281 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
2282 | void *data) | |
aa42240a TF |
2283 | { |
2284 | struct of_genpd_provider *cp; | |
2285 | ||
2286 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
2287 | if (!cp) | |
2288 | return -ENOMEM; | |
2289 | ||
2290 | cp->node = of_node_get(np); | |
2291 | cp->data = data; | |
2292 | cp->xlate = xlate; | |
bab2d712 | 2293 | fwnode_dev_initialized(&np->fwnode, true); |
aa42240a TF |
2294 | |
2295 | mutex_lock(&of_genpd_mutex); | |
2296 | list_add(&cp->link, &of_genpd_providers); | |
2297 | mutex_unlock(&of_genpd_mutex); | |
ea11e94b | 2298 | pr_debug("Added domain provider from %pOF\n", np); |
aa42240a TF |
2299 | |
2300 | return 0; | |
2301 | } | |
892ebdcc | 2302 | |
fe0c2baa UH |
2303 | static bool genpd_present(const struct generic_pm_domain *genpd) |
2304 | { | |
40ba55e4 | 2305 | bool ret = false; |
fe0c2baa UH |
2306 | const struct generic_pm_domain *gpd; |
2307 | ||
40ba55e4 SB |
2308 | mutex_lock(&gpd_list_lock); |
2309 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
2310 | if (gpd == genpd) { | |
2311 | ret = true; | |
2312 | break; | |
2313 | } | |
2314 | } | |
2315 | mutex_unlock(&gpd_list_lock); | |
2316 | ||
2317 | return ret; | |
fe0c2baa UH |
2318 | } |
2319 | ||
892ebdcc JH |
2320 | /** |
2321 | * of_genpd_add_provider_simple() - Register a simple PM domain provider | |
2322 | * @np: Device node pointer associated with the PM domain provider. | |
2323 | * @genpd: Pointer to PM domain associated with the PM domain provider. | |
2324 | */ | |
2325 | int of_genpd_add_provider_simple(struct device_node *np, | |
2326 | struct generic_pm_domain *genpd) | |
2327 | { | |
40ba55e4 | 2328 | int ret; |
0159ec67 JH |
2329 | |
2330 | if (!np || !genpd) | |
2331 | return -EINVAL; | |
2332 | ||
6a0ae73d | 2333 | if (!genpd_present(genpd)) |
40ba55e4 | 2334 | return -EINVAL; |
6a0ae73d VK |
2335 | |
2336 | genpd->dev.of_node = np; | |
2337 | ||
2338 | /* Parse genpd OPP table */ | |
3dd91515 | 2339 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
6a0ae73d | 2340 | ret = dev_pm_opp_of_add_table(&genpd->dev); |
9a6582b8 AF |
2341 | if (ret) |
2342 | return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n"); | |
1067ae3e VK |
2343 | |
2344 | /* | |
2345 | * Save table for faster processing while setting performance | |
2346 | * state. | |
2347 | */ | |
2348 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); | |
dd461cd9 | 2349 | WARN_ON(IS_ERR(genpd->opp_table)); |
de0aa06d JH |
2350 | } |
2351 | ||
6a0ae73d VK |
2352 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
2353 | if (ret) { | |
3dd91515 | 2354 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
1067ae3e | 2355 | dev_pm_opp_put_opp_table(genpd->opp_table); |
6a0ae73d | 2356 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2357 | } |
6a0ae73d | 2358 | |
40ba55e4 | 2359 | return ret; |
6a0ae73d VK |
2360 | } |
2361 | ||
2362 | genpd->provider = &np->fwnode; | |
2363 | genpd->has_provider = true; | |
2364 | ||
40ba55e4 | 2365 | return 0; |
892ebdcc JH |
2366 | } |
2367 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); | |
2368 | ||
2369 | /** | |
2370 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider | |
2371 | * @np: Device node pointer associated with the PM domain provider. | |
2372 | * @data: Pointer to the data associated with the PM domain provider. | |
2373 | */ | |
2374 | int of_genpd_add_provider_onecell(struct device_node *np, | |
2375 | struct genpd_onecell_data *data) | |
2376 | { | |
6a0ae73d | 2377 | struct generic_pm_domain *genpd; |
0159ec67 | 2378 | unsigned int i; |
de0aa06d | 2379 | int ret = -EINVAL; |
0159ec67 JH |
2380 | |
2381 | if (!np || !data) | |
2382 | return -EINVAL; | |
2383 | ||
40845524 TR |
2384 | if (!data->xlate) |
2385 | data->xlate = genpd_xlate_onecell; | |
2386 | ||
0159ec67 | 2387 | for (i = 0; i < data->num_domains; i++) { |
6a0ae73d VK |
2388 | genpd = data->domains[i]; |
2389 | ||
2390 | if (!genpd) | |
609bed67 | 2391 | continue; |
6a0ae73d | 2392 | if (!genpd_present(genpd)) |
de0aa06d JH |
2393 | goto error; |
2394 | ||
6a0ae73d VK |
2395 | genpd->dev.of_node = np; |
2396 | ||
2397 | /* Parse genpd OPP table */ | |
3dd91515 | 2398 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
6a0ae73d VK |
2399 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); |
2400 | if (ret) { | |
9a6582b8 AF |
2401 | dev_err_probe(&genpd->dev, ret, |
2402 | "Failed to add OPP table for index %d\n", i); | |
6a0ae73d VK |
2403 | goto error; |
2404 | } | |
1067ae3e VK |
2405 | |
2406 | /* | |
2407 | * Save table for faster processing while setting | |
2408 | * performance state. | |
2409 | */ | |
e77dcb0b | 2410 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
dd461cd9 | 2411 | WARN_ON(IS_ERR(genpd->opp_table)); |
6a0ae73d VK |
2412 | } |
2413 | ||
2414 | genpd->provider = &np->fwnode; | |
2415 | genpd->has_provider = true; | |
0159ec67 JH |
2416 | } |
2417 | ||
40845524 | 2418 | ret = genpd_add_provider(np, data->xlate, data); |
de0aa06d JH |
2419 | if (ret < 0) |
2420 | goto error; | |
2421 | ||
de0aa06d JH |
2422 | return 0; |
2423 | ||
2424 | error: | |
2425 | while (i--) { | |
6a0ae73d VK |
2426 | genpd = data->domains[i]; |
2427 | ||
2428 | if (!genpd) | |
609bed67 | 2429 | continue; |
6a0ae73d VK |
2430 | |
2431 | genpd->provider = NULL; | |
2432 | genpd->has_provider = false; | |
2433 | ||
3dd91515 | 2434 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
1067ae3e | 2435 | dev_pm_opp_put_opp_table(genpd->opp_table); |
6a0ae73d | 2436 | dev_pm_opp_of_remove_table(&genpd->dev); |
1067ae3e | 2437 | } |
de0aa06d | 2438 | } |
0159ec67 | 2439 | |
0159ec67 | 2440 | return ret; |
892ebdcc JH |
2441 | } |
2442 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); | |
aa42240a TF |
2443 | |
2444 | /** | |
2445 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
2446 | * @np: Device node pointer associated with the PM domain provider | |
2447 | */ | |
2448 | void of_genpd_del_provider(struct device_node *np) | |
2449 | { | |
b556b15d | 2450 | struct of_genpd_provider *cp, *tmp; |
de0aa06d | 2451 | struct generic_pm_domain *gpd; |
aa42240a | 2452 | |
de0aa06d | 2453 | mutex_lock(&gpd_list_lock); |
aa42240a | 2454 | mutex_lock(&of_genpd_mutex); |
b556b15d | 2455 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
aa42240a | 2456 | if (cp->node == np) { |
de0aa06d JH |
2457 | /* |
2458 | * For each PM domain associated with the | |
2459 | * provider, set the 'has_provider' to false | |
2460 | * so that the PM domain can be safely removed. | |
2461 | */ | |
6a0ae73d VK |
2462 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
2463 | if (gpd->provider == &np->fwnode) { | |
de0aa06d JH |
2464 | gpd->has_provider = false; |
2465 | ||
3dd91515 | 2466 | if (genpd_is_opp_table_fw(gpd) || !gpd->set_performance_state) |
6a0ae73d VK |
2467 | continue; |
2468 | ||
1067ae3e | 2469 | dev_pm_opp_put_opp_table(gpd->opp_table); |
6a0ae73d VK |
2470 | dev_pm_opp_of_remove_table(&gpd->dev); |
2471 | } | |
2472 | } | |
2473 | ||
bab2d712 | 2474 | fwnode_dev_initialized(&cp->node->fwnode, false); |
aa42240a TF |
2475 | list_del(&cp->link); |
2476 | of_node_put(cp->node); | |
2477 | kfree(cp); | |
2478 | break; | |
2479 | } | |
2480 | } | |
2481 | mutex_unlock(&of_genpd_mutex); | |
de0aa06d | 2482 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2483 | } |
2484 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
2485 | ||
2486 | /** | |
f58d4e5a | 2487 | * genpd_get_from_provider() - Look-up PM domain |
aa42240a TF |
2488 | * @genpdspec: OF phandle args to use for look-up |
2489 | * | |
2490 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
2491 | * found, uses xlate function of the provider to map phandle args to a PM | |
2492 | * domain. | |
2493 | * | |
2494 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
2495 | * on failure. | |
2496 | */ | |
f58d4e5a | 2497 | static struct generic_pm_domain *genpd_get_from_provider( |
aa42240a TF |
2498 | struct of_phandle_args *genpdspec) |
2499 | { | |
2500 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
2501 | struct of_genpd_provider *provider; | |
2502 | ||
41795a8a JH |
2503 | if (!genpdspec) |
2504 | return ERR_PTR(-EINVAL); | |
2505 | ||
aa42240a TF |
2506 | mutex_lock(&of_genpd_mutex); |
2507 | ||
2508 | /* Check if we have such a provider in our array */ | |
2509 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
2510 | if (provider->node == genpdspec->np) | |
2511 | genpd = provider->xlate(genpdspec, provider->data); | |
2512 | if (!IS_ERR(genpd)) | |
2513 | break; | |
2514 | } | |
2515 | ||
2516 | mutex_unlock(&of_genpd_mutex); | |
2517 | ||
2518 | return genpd; | |
2519 | } | |
2520 | ||
ec69572b JH |
2521 | /** |
2522 | * of_genpd_add_device() - Add a device to an I/O PM domain | |
2523 | * @genpdspec: OF phandle args to use for look-up PM domain | |
2524 | * @dev: Device to be added. | |
2525 | * | |
2526 | * Looks-up an I/O PM domain based upon phandle args provided and adds | |
2527 | * the device to the PM domain. Returns a negative error code on failure. | |
2528 | */ | |
2529 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) | |
2530 | { | |
2531 | struct generic_pm_domain *genpd; | |
19efa5ff JH |
2532 | int ret; |
2533 | ||
4384a70c UH |
2534 | if (!dev) |
2535 | return -EINVAL; | |
2536 | ||
19efa5ff | 2537 | mutex_lock(&gpd_list_lock); |
ec69572b | 2538 | |
f58d4e5a | 2539 | genpd = genpd_get_from_provider(genpdspec); |
19efa5ff JH |
2540 | if (IS_ERR(genpd)) { |
2541 | ret = PTR_ERR(genpd); | |
2542 | goto out; | |
2543 | } | |
2544 | ||
f9ccd7c3 | 2545 | ret = genpd_add_device(genpd, dev, dev); |
ec69572b | 2546 | |
19efa5ff JH |
2547 | out: |
2548 | mutex_unlock(&gpd_list_lock); | |
2549 | ||
2550 | return ret; | |
ec69572b JH |
2551 | } |
2552 | EXPORT_SYMBOL_GPL(of_genpd_add_device); | |
2553 | ||
2554 | /** | |
2555 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
2556 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2557 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2558 | * | |
2559 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2560 | * provided and adds the subdomain to the parent PM domain. Returns a | |
2561 | * negative error code on failure. | |
2562 | */ | |
2563 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, | |
2564 | struct of_phandle_args *subdomain_spec) | |
2565 | { | |
2566 | struct generic_pm_domain *parent, *subdomain; | |
19efa5ff JH |
2567 | int ret; |
2568 | ||
2569 | mutex_lock(&gpd_list_lock); | |
ec69572b | 2570 | |
f58d4e5a | 2571 | parent = genpd_get_from_provider(parent_spec); |
19efa5ff JH |
2572 | if (IS_ERR(parent)) { |
2573 | ret = PTR_ERR(parent); | |
2574 | goto out; | |
2575 | } | |
ec69572b | 2576 | |
f58d4e5a | 2577 | subdomain = genpd_get_from_provider(subdomain_spec); |
19efa5ff JH |
2578 | if (IS_ERR(subdomain)) { |
2579 | ret = PTR_ERR(subdomain); | |
2580 | goto out; | |
2581 | } | |
2582 | ||
2583 | ret = genpd_add_subdomain(parent, subdomain); | |
ec69572b | 2584 | |
19efa5ff JH |
2585 | out: |
2586 | mutex_unlock(&gpd_list_lock); | |
2587 | ||
18027d6f | 2588 | return ret == -ENOENT ? -EPROBE_DEFER : ret; |
ec69572b JH |
2589 | } |
2590 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); | |
2591 | ||
dedd1492 UH |
2592 | /** |
2593 | * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
2594 | * @parent_spec: OF phandle args to use for parent PM domain look-up | |
2595 | * @subdomain_spec: OF phandle args to use for subdomain look-up | |
2596 | * | |
2597 | * Looks-up a parent PM domain and subdomain based upon phandle args | |
2598 | * provided and removes the subdomain from the parent PM domain. Returns a | |
2599 | * negative error code on failure. | |
2600 | */ | |
2601 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, | |
2602 | struct of_phandle_args *subdomain_spec) | |
2603 | { | |
2604 | struct generic_pm_domain *parent, *subdomain; | |
2605 | int ret; | |
2606 | ||
2607 | mutex_lock(&gpd_list_lock); | |
2608 | ||
2609 | parent = genpd_get_from_provider(parent_spec); | |
2610 | if (IS_ERR(parent)) { | |
2611 | ret = PTR_ERR(parent); | |
2612 | goto out; | |
2613 | } | |
2614 | ||
2615 | subdomain = genpd_get_from_provider(subdomain_spec); | |
2616 | if (IS_ERR(subdomain)) { | |
2617 | ret = PTR_ERR(subdomain); | |
2618 | goto out; | |
2619 | } | |
2620 | ||
2621 | ret = pm_genpd_remove_subdomain(parent, subdomain); | |
2622 | ||
2623 | out: | |
2624 | mutex_unlock(&gpd_list_lock); | |
2625 | ||
2626 | return ret; | |
2627 | } | |
2628 | EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); | |
2629 | ||
17926551 JH |
2630 | /** |
2631 | * of_genpd_remove_last - Remove the last PM domain registered for a provider | |
763663c9 | 2632 | * @np: Pointer to device node associated with provider |
17926551 JH |
2633 | * |
2634 | * Find the last PM domain that was added by a particular provider and | |
2635 | * remove this PM domain from the list of PM domains. The provider is | |
2636 | * identified by the 'provider' device structure that is passed. The PM | |
2637 | * domain will only be removed, if the provider associated with domain | |
2638 | * has been removed. | |
2639 | * | |
2640 | * Returns a valid pointer to struct generic_pm_domain on success or | |
2641 | * ERR_PTR() on failure. | |
2642 | */ | |
2643 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) | |
2644 | { | |
a7e2d1bc | 2645 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
17926551 JH |
2646 | int ret; |
2647 | ||
2648 | if (IS_ERR_OR_NULL(np)) | |
2649 | return ERR_PTR(-EINVAL); | |
2650 | ||
2651 | mutex_lock(&gpd_list_lock); | |
a7e2d1bc | 2652 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
17926551 JH |
2653 | if (gpd->provider == &np->fwnode) { |
2654 | ret = genpd_remove(gpd); | |
2655 | genpd = ret ? ERR_PTR(ret) : gpd; | |
2656 | break; | |
2657 | } | |
2658 | } | |
2659 | mutex_unlock(&gpd_list_lock); | |
2660 | ||
2661 | return genpd; | |
2662 | } | |
2663 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); | |
2664 | ||
3c095f32 UH |
2665 | static void genpd_release_dev(struct device *dev) |
2666 | { | |
e8b04de9 | 2667 | of_node_put(dev->of_node); |
3c095f32 UH |
2668 | kfree(dev); |
2669 | } | |
2670 | ||
580fc9c7 | 2671 | static const struct bus_type genpd_bus_type = { |
3c095f32 UH |
2672 | .name = "genpd", |
2673 | }; | |
2674 | ||
aa42240a TF |
2675 | /** |
2676 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 2677 | * @dev: Device to detach. |
aa42240a TF |
2678 | * @power_off: Currently not used |
2679 | * | |
2680 | * Try to locate a corresponding generic PM domain, which the device was | |
2681 | * attached to previously. If such is found, the device is detached from it. | |
2682 | */ | |
2683 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
2684 | { | |
446d999c | 2685 | struct generic_pm_domain *pd; |
93af5e93 | 2686 | unsigned int i; |
aa42240a TF |
2687 | int ret = 0; |
2688 | ||
85168d56 UH |
2689 | pd = dev_to_genpd(dev); |
2690 | if (IS_ERR(pd)) | |
aa42240a TF |
2691 | return; |
2692 | ||
2693 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
2694 | ||
c016baf7 RN |
2695 | /* Drop the default performance state */ |
2696 | if (dev_gpd_data(dev)->default_pstate) { | |
2697 | dev_pm_genpd_set_performance_state(dev, 0); | |
2698 | dev_gpd_data(dev)->default_pstate = 0; | |
2699 | } | |
2700 | ||
93af5e93 | 2701 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
85168d56 | 2702 | ret = genpd_remove_device(pd, dev); |
aa42240a TF |
2703 | if (ret != -EAGAIN) |
2704 | break; | |
93af5e93 GU |
2705 | |
2706 | mdelay(i); | |
aa42240a TF |
2707 | cond_resched(); |
2708 | } | |
2709 | ||
2710 | if (ret < 0) { | |
2711 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
2712 | pd->name, ret); | |
2713 | return; | |
2714 | } | |
2715 | ||
2716 | /* Check if PM domain can be powered off after removing this device. */ | |
2717 | genpd_queue_power_off_work(pd); | |
3c095f32 UH |
2718 | |
2719 | /* Unregister the device if it was created by genpd. */ | |
2720 | if (dev->bus == &genpd_bus_type) | |
2721 | device_unregister(dev); | |
aa42240a TF |
2722 | } |
2723 | ||
632f7ce3 RK |
2724 | static void genpd_dev_pm_sync(struct device *dev) |
2725 | { | |
2726 | struct generic_pm_domain *pd; | |
2727 | ||
2728 | pd = dev_to_genpd(dev); | |
2729 | if (IS_ERR(pd)) | |
2730 | return; | |
2731 | ||
2732 | genpd_queue_power_off_work(pd); | |
2733 | } | |
2734 | ||
51dcf748 UH |
2735 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
2736 | unsigned int index, bool power_on) | |
aa42240a TF |
2737 | { |
2738 | struct of_phandle_args pd_args; | |
2739 | struct generic_pm_domain *pd; | |
c016baf7 | 2740 | int pstate; |
aa42240a TF |
2741 | int ret; |
2742 | ||
e8b04de9 | 2743 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
8cb1cbd6 | 2744 | "#power-domain-cells", index, &pd_args); |
001d50c9 | 2745 | if (ret < 0) |
bcd931f2 | 2746 | return ret; |
aa42240a | 2747 | |
19efa5ff | 2748 | mutex_lock(&gpd_list_lock); |
f58d4e5a | 2749 | pd = genpd_get_from_provider(&pd_args); |
265e2cf6 | 2750 | of_node_put(pd_args.np); |
aa42240a | 2751 | if (IS_ERR(pd)) { |
19efa5ff | 2752 | mutex_unlock(&gpd_list_lock); |
aa42240a TF |
2753 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
2754 | __func__, PTR_ERR(pd)); | |
e20813dc | 2755 | return driver_deferred_probe_check_state(base_dev); |
aa42240a TF |
2756 | } |
2757 | ||
2758 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
2759 | ||
f9ccd7c3 | 2760 | ret = genpd_add_device(pd, dev, base_dev); |
19efa5ff | 2761 | mutex_unlock(&gpd_list_lock); |
aa42240a | 2762 | |
9a6582b8 AF |
2763 | if (ret < 0) |
2764 | return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name); | |
aa42240a TF |
2765 | |
2766 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2767 | dev->pm_domain->sync = genpd_dev_pm_sync; |
aa42240a | 2768 | |
c016baf7 RN |
2769 | /* Set the default performance state */ |
2770 | pstate = of_get_required_opp_performance_state(dev->of_node, index); | |
65616418 | 2771 | if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) { |
c016baf7 RN |
2772 | ret = pstate; |
2773 | goto err; | |
2774 | } else if (pstate > 0) { | |
2775 | ret = dev_pm_genpd_set_performance_state(dev, pstate); | |
2776 | if (ret) | |
2777 | goto err; | |
2778 | dev_gpd_data(dev)->default_pstate = pstate; | |
2779 | } | |
ae8ac196 AV |
2780 | |
2781 | if (power_on) { | |
2782 | genpd_lock(pd); | |
2783 | ret = genpd_power_on(pd, 0); | |
2784 | genpd_unlock(pd); | |
2785 | } | |
2786 | ||
2787 | if (ret) { | |
2788 | /* Drop the default performance state */ | |
2789 | if (dev_gpd_data(dev)->default_pstate) { | |
2790 | dev_pm_genpd_set_performance_state(dev, 0); | |
2791 | dev_gpd_data(dev)->default_pstate = 0; | |
2792 | } | |
2793 | ||
2794 | genpd_remove_device(pd, dev); | |
2795 | return -EPROBE_DEFER; | |
2796 | } | |
2797 | ||
c016baf7 RN |
2798 | return 1; |
2799 | ||
2800 | err: | |
2801 | dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", | |
2802 | pd->name, ret); | |
2803 | genpd_remove_device(pd, dev); | |
2804 | return ret; | |
aa42240a | 2805 | } |
8cb1cbd6 UH |
2806 | |
2807 | /** | |
2808 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
2809 | * @dev: Device to attach. | |
2810 | * | |
2811 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
2812 | * attaches the device to retrieved pm_domain ops. | |
2813 | * | |
2814 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a | |
2815 | * PM domain or when multiple power-domains exists for it, else a negative error | |
2816 | * code. Note that if a power-domain exists for the device, but it cannot be | |
2817 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is | |
2818 | * not probed and to re-try again later. | |
2819 | */ | |
2820 | int genpd_dev_pm_attach(struct device *dev) | |
2821 | { | |
2822 | if (!dev->of_node) | |
2823 | return 0; | |
2824 | ||
2825 | /* | |
2826 | * Devices with multiple PM domains must be attached separately, as we | |
2827 | * can only attach one PM domain per device. | |
2828 | */ | |
2829 | if (of_count_phandle_with_args(dev->of_node, "power-domains", | |
2830 | "#power-domain-cells") != 1) | |
2831 | return 0; | |
2832 | ||
51dcf748 | 2833 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
8cb1cbd6 | 2834 | } |
aa42240a | 2835 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
30f60428 | 2836 | |
3c095f32 UH |
2837 | /** |
2838 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. | |
2839 | * @dev: The device used to lookup the PM domain. | |
2840 | * @index: The index of the PM domain. | |
2841 | * | |
2842 | * Parse device's OF node to find a PM domain specifier at the provided @index. | |
2843 | * If such is found, creates a virtual device and attaches it to the retrieved | |
2844 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() | |
2845 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). | |
2846 | * | |
2847 | * Returns the created virtual device if successfully attached PM domain, NULL | |
2848 | * when the device don't need a PM domain, else an ERR_PTR() in case of | |
2849 | * failures. If a power-domain exists for the device, but cannot be found or | |
2850 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device | |
2851 | * is not probed and to re-try again later. | |
2852 | */ | |
2853 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, | |
2854 | unsigned int index) | |
2855 | { | |
560928b2 | 2856 | struct device *virt_dev; |
3c095f32 UH |
2857 | int num_domains; |
2858 | int ret; | |
2859 | ||
2860 | if (!dev->of_node) | |
2861 | return NULL; | |
2862 | ||
3ccf3f0c | 2863 | /* Verify that the index is within a valid range. */ |
3c095f32 UH |
2864 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
2865 | "#power-domain-cells"); | |
3ccf3f0c | 2866 | if (index >= num_domains) |
3c095f32 UH |
2867 | return NULL; |
2868 | ||
2869 | /* Allocate and register device on the genpd bus. */ | |
560928b2 VK |
2870 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
2871 | if (!virt_dev) | |
3c095f32 UH |
2872 | return ERR_PTR(-ENOMEM); |
2873 | ||
560928b2 VK |
2874 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
2875 | virt_dev->bus = &genpd_bus_type; | |
2876 | virt_dev->release = genpd_release_dev; | |
e8b04de9 | 2877 | virt_dev->of_node = of_node_get(dev->of_node); |
3c095f32 | 2878 | |
560928b2 | 2879 | ret = device_register(virt_dev); |
3c095f32 | 2880 | if (ret) { |
71b77697 | 2881 | put_device(virt_dev); |
3c095f32 UH |
2882 | return ERR_PTR(ret); |
2883 | } | |
2884 | ||
2885 | /* Try to attach the device to the PM domain at the specified index. */ | |
51dcf748 | 2886 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
3c095f32 | 2887 | if (ret < 1) { |
560928b2 | 2888 | device_unregister(virt_dev); |
3c095f32 UH |
2889 | return ret ? ERR_PTR(ret) : NULL; |
2890 | } | |
2891 | ||
560928b2 VK |
2892 | pm_runtime_enable(virt_dev); |
2893 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); | |
3c095f32 | 2894 | |
560928b2 | 2895 | return virt_dev; |
3c095f32 UH |
2896 | } |
2897 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); | |
2898 | ||
5d6be70a UH |
2899 | /** |
2900 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. | |
2901 | * @dev: The device used to lookup the PM domain. | |
2902 | * @name: The name of the PM domain. | |
2903 | * | |
2904 | * Parse device's OF node to find a PM domain specifier using the | |
2905 | * power-domain-names DT property. For further description see | |
2906 | * genpd_dev_pm_attach_by_id(). | |
2907 | */ | |
7416f1f2 | 2908 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
5d6be70a UH |
2909 | { |
2910 | int index; | |
2911 | ||
2912 | if (!dev->of_node) | |
2913 | return NULL; | |
2914 | ||
2915 | index = of_property_match_string(dev->of_node, "power-domain-names", | |
2916 | name); | |
2917 | if (index < 0) | |
2918 | return NULL; | |
2919 | ||
2920 | return genpd_dev_pm_attach_by_id(dev, index); | |
2921 | } | |
2922 | ||
30f60428 | 2923 | static const struct of_device_id idle_state_match[] = { |
598da548 | 2924 | { .compatible = "domain-idle-state", }, |
30f60428 LI |
2925 | { } |
2926 | }; | |
2927 | ||
2928 | static int genpd_parse_state(struct genpd_power_state *genpd_state, | |
2929 | struct device_node *state_node) | |
2930 | { | |
2931 | int err; | |
2932 | u32 residency; | |
2933 | u32 entry_latency, exit_latency; | |
30f60428 LI |
2934 | |
2935 | err = of_property_read_u32(state_node, "entry-latency-us", | |
2936 | &entry_latency); | |
2937 | if (err) { | |
ea11e94b | 2938 | pr_debug(" * %pOF missing entry-latency-us property\n", |
7a5bd127 | 2939 | state_node); |
30f60428 LI |
2940 | return -EINVAL; |
2941 | } | |
2942 | ||
2943 | err = of_property_read_u32(state_node, "exit-latency-us", | |
2944 | &exit_latency); | |
2945 | if (err) { | |
ea11e94b | 2946 | pr_debug(" * %pOF missing exit-latency-us property\n", |
7a5bd127 | 2947 | state_node); |
30f60428 LI |
2948 | return -EINVAL; |
2949 | } | |
2950 | ||
2951 | err = of_property_read_u32(state_node, "min-residency-us", &residency); | |
2952 | if (!err) | |
e5d1c872 | 2953 | genpd_state->residency_ns = 1000LL * residency; |
30f60428 | 2954 | |
e5d1c872 NZ |
2955 | genpd_state->power_on_latency_ns = 1000LL * exit_latency; |
2956 | genpd_state->power_off_latency_ns = 1000LL * entry_latency; | |
0c9b694a | 2957 | genpd_state->fwnode = &state_node->fwnode; |
30f60428 LI |
2958 | |
2959 | return 0; | |
2960 | } | |
2961 | ||
a3381e3a UH |
2962 | static int genpd_iterate_idle_states(struct device_node *dn, |
2963 | struct genpd_power_state *states) | |
2964 | { | |
2965 | int ret; | |
2966 | struct of_phandle_iterator it; | |
2967 | struct device_node *np; | |
2968 | int i = 0; | |
2969 | ||
2970 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); | |
2971 | if (ret <= 0) | |
56cb2689 | 2972 | return ret == -ENOENT ? 0 : ret; |
a3381e3a UH |
2973 | |
2974 | /* Loop over the phandles until all the requested entry is found */ | |
2975 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { | |
2976 | np = it.node; | |
2977 | if (!of_match_node(idle_state_match, np)) | |
2978 | continue; | |
e0c57a5c SH |
2979 | |
2980 | if (!of_device_is_available(np)) | |
2981 | continue; | |
2982 | ||
a3381e3a UH |
2983 | if (states) { |
2984 | ret = genpd_parse_state(&states[i], np); | |
2985 | if (ret) { | |
2986 | pr_err("Parsing idle state node %pOF failed with err %d\n", | |
2987 | np, ret); | |
2988 | of_node_put(np); | |
2989 | return ret; | |
2990 | } | |
2991 | } | |
2992 | i++; | |
2993 | } | |
2994 | ||
2995 | return i; | |
2996 | } | |
2997 | ||
30f60428 LI |
2998 | /** |
2999 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. | |
3000 | * | |
3001 | * @dn: The genpd device node | |
3002 | * @states: The pointer to which the state array will be saved. | |
3003 | * @n: The count of elements in the array returned from this function. | |
3004 | * | |
3005 | * Returns the device states parsed from the OF node. The memory for the states | |
3006 | * is allocated by this function and is the responsibility of the caller to | |
2c361684 UH |
3007 | * free the memory after use. If any or zero compatible domain idle states is |
3008 | * found it returns 0 and in case of errors, a negative error code is returned. | |
30f60428 LI |
3009 | */ |
3010 | int of_genpd_parse_idle_states(struct device_node *dn, | |
3011 | struct genpd_power_state **states, int *n) | |
3012 | { | |
3013 | struct genpd_power_state *st; | |
a3381e3a | 3014 | int ret; |
30f60428 | 3015 | |
a3381e3a | 3016 | ret = genpd_iterate_idle_states(dn, NULL); |
2c361684 UH |
3017 | if (ret < 0) |
3018 | return ret; | |
3019 | ||
3020 | if (!ret) { | |
3021 | *states = NULL; | |
3022 | *n = 0; | |
3023 | return 0; | |
3024 | } | |
30f60428 | 3025 | |
a3381e3a | 3026 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
30f60428 LI |
3027 | if (!st) |
3028 | return -ENOMEM; | |
3029 | ||
a3381e3a UH |
3030 | ret = genpd_iterate_idle_states(dn, st); |
3031 | if (ret <= 0) { | |
3032 | kfree(st); | |
3033 | return ret < 0 ? ret : -EINVAL; | |
30f60428 LI |
3034 | } |
3035 | ||
a3381e3a UH |
3036 | *states = st; |
3037 | *n = ret; | |
30f60428 LI |
3038 | |
3039 | return 0; | |
3040 | } | |
3041 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); | |
3042 | ||
3c095f32 UH |
3043 | static int __init genpd_bus_init(void) |
3044 | { | |
3045 | return bus_register(&genpd_bus_type); | |
3046 | } | |
3047 | core_initcall(genpd_bus_init); | |
3048 | ||
d30d819d | 3049 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
3050 | |
3051 | ||
3052 | /*** debugfs support ***/ | |
3053 | ||
8b0510b5 | 3054 | #ifdef CONFIG_DEBUG_FS |
2bd5306a MM |
3055 | /* |
3056 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 3057 | * from sysfs.c, so generalize it. |
2bd5306a | 3058 | */ |
2bd5306a MM |
3059 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
3060 | { | |
3061 | static const char * const status_lookup[] = { | |
3062 | [RPM_ACTIVE] = "active", | |
3063 | [RPM_RESUMING] = "resuming", | |
3064 | [RPM_SUSPENDED] = "suspended", | |
3065 | [RPM_SUSPENDING] = "suspending" | |
3066 | }; | |
3067 | const char *p = ""; | |
3068 | ||
3069 | if (dev->power.runtime_error) | |
3070 | p = "error"; | |
3071 | else if (dev->power.disable_depth) | |
3072 | p = "unsupported"; | |
3073 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
3074 | p = status_lookup[dev->power.runtime_status]; | |
3075 | else | |
3076 | WARN_ON(1); | |
3077 | ||
45fbc464 DO |
3078 | seq_printf(s, "%-25s ", p); |
3079 | } | |
3080 | ||
3081 | static void perf_status_str(struct seq_file *s, struct device *dev) | |
3082 | { | |
3083 | struct generic_pm_domain_data *gpd_data; | |
3084 | ||
3085 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); | |
3086 | seq_put_decimal_ull(s, "", gpd_data->performance_state); | |
2bd5306a | 3087 | } |
2bd5306a | 3088 | |
9e9704ea UH |
3089 | static int genpd_summary_one(struct seq_file *s, |
3090 | struct generic_pm_domain *genpd) | |
2bd5306a MM |
3091 | { |
3092 | static const char * const status_lookup[] = { | |
49f618e1 UH |
3093 | [GENPD_STATE_ON] = "on", |
3094 | [GENPD_STATE_OFF] = "off" | |
2bd5306a MM |
3095 | }; |
3096 | struct pm_domain_data *pm_data; | |
3097 | const char *kobj_path; | |
3098 | struct gpd_link *link; | |
6954d432 | 3099 | char state[16]; |
2bd5306a MM |
3100 | int ret; |
3101 | ||
35241d12 | 3102 | ret = genpd_lock_interruptible(genpd); |
2bd5306a MM |
3103 | if (ret) |
3104 | return -ERESTARTSYS; | |
3105 | ||
66a5ca4b | 3106 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 3107 | goto exit; |
41e2c8e0 | 3108 | if (!genpd_status_on(genpd)) |
0ba554e4 | 3109 | snprintf(state, sizeof(state), "%s-%u", |
6954d432 | 3110 | status_lookup[genpd->status], genpd->state_idx); |
fc5cbf0c | 3111 | else |
6954d432 GU |
3112 | snprintf(state, sizeof(state), "%s", |
3113 | status_lookup[genpd->status]); | |
45fbc464 | 3114 | seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state); |
2bd5306a MM |
3115 | |
3116 | /* | |
3117 | * Modifications on the list require holding locks on both | |
8d87ae48 | 3118 | * parent and child, so we are safe. |
66a5ca4b | 3119 | * Also genpd->name is immutable. |
2bd5306a | 3120 | */ |
8d87ae48 | 3121 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
45fbc464 DO |
3122 | if (list_is_first(&link->parent_node, &genpd->parent_links)) |
3123 | seq_printf(s, "\n%48s", " "); | |
8d87ae48 KC |
3124 | seq_printf(s, "%s", link->child->name); |
3125 | if (!list_is_last(&link->parent_node, &genpd->parent_links)) | |
2bd5306a MM |
3126 | seq_puts(s, ", "); |
3127 | } | |
3128 | ||
66a5ca4b | 3129 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
d716f479 LI |
3130 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
3131 | genpd_is_irq_safe(genpd) ? | |
3132 | GFP_ATOMIC : GFP_KERNEL); | |
2bd5306a MM |
3133 | if (kobj_path == NULL) |
3134 | continue; | |
3135 | ||
3136 | seq_printf(s, "\n %-50s ", kobj_path); | |
3137 | rtpm_status_str(s, pm_data->dev); | |
45fbc464 | 3138 | perf_status_str(s, pm_data->dev); |
2bd5306a MM |
3139 | kfree(kobj_path); |
3140 | } | |
3141 | ||
3142 | seq_puts(s, "\n"); | |
3143 | exit: | |
35241d12 | 3144 | genpd_unlock(genpd); |
2bd5306a MM |
3145 | |
3146 | return 0; | |
3147 | } | |
3148 | ||
d32dcc6c | 3149 | static int summary_show(struct seq_file *s, void *data) |
2bd5306a | 3150 | { |
66a5ca4b | 3151 | struct generic_pm_domain *genpd; |
2bd5306a MM |
3152 | int ret = 0; |
3153 | ||
45fbc464 | 3154 | seq_puts(s, "domain status children performance\n"); |
15dec67a | 3155 | seq_puts(s, " /device runtime status\n"); |
45fbc464 | 3156 | seq_puts(s, "----------------------------------------------------------------------------------------------\n"); |
2bd5306a MM |
3157 | |
3158 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
3159 | if (ret) | |
3160 | return -ERESTARTSYS; | |
3161 | ||
66a5ca4b | 3162 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
9e9704ea | 3163 | ret = genpd_summary_one(s, genpd); |
2bd5306a MM |
3164 | if (ret) |
3165 | break; | |
3166 | } | |
3167 | mutex_unlock(&gpd_list_lock); | |
3168 | ||
3169 | return ret; | |
3170 | } | |
3171 | ||
d32dcc6c | 3172 | static int status_show(struct seq_file *s, void *data) |
2bd5306a | 3173 | { |
b6a1d093 | 3174 | static const char * const status_lookup[] = { |
49f618e1 UH |
3175 | [GENPD_STATE_ON] = "on", |
3176 | [GENPD_STATE_OFF] = "off" | |
b6a1d093 TG |
3177 | }; |
3178 | ||
3179 | struct generic_pm_domain *genpd = s->private; | |
3180 | int ret = 0; | |
3181 | ||
3182 | ret = genpd_lock_interruptible(genpd); | |
3183 | if (ret) | |
3184 | return -ERESTARTSYS; | |
3185 | ||
3186 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) | |
3187 | goto exit; | |
3188 | ||
49f618e1 | 3189 | if (genpd->status == GENPD_STATE_OFF) |
b6a1d093 TG |
3190 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
3191 | genpd->state_idx); | |
3192 | else | |
3193 | seq_printf(s, "%s\n", status_lookup[genpd->status]); | |
3194 | exit: | |
3195 | genpd_unlock(genpd); | |
3196 | return ret; | |
2bd5306a MM |
3197 | } |
3198 | ||
d32dcc6c | 3199 | static int sub_domains_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3200 | { |
3201 | struct generic_pm_domain *genpd = s->private; | |
3202 | struct gpd_link *link; | |
3203 | int ret = 0; | |
3204 | ||
3205 | ret = genpd_lock_interruptible(genpd); | |
3206 | if (ret) | |
3207 | return -ERESTARTSYS; | |
3208 | ||
8d87ae48 KC |
3209 | list_for_each_entry(link, &genpd->parent_links, parent_node) |
3210 | seq_printf(s, "%s\n", link->child->name); | |
b6a1d093 TG |
3211 | |
3212 | genpd_unlock(genpd); | |
3213 | return ret; | |
3214 | } | |
3215 | ||
d32dcc6c | 3216 | static int idle_states_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3217 | { |
3218 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3219 | u64 now, delta, idle_time = 0; |
b6a1d093 TG |
3220 | unsigned int i; |
3221 | int ret = 0; | |
3222 | ||
3223 | ret = genpd_lock_interruptible(genpd); | |
3224 | if (ret) | |
3225 | return -ERESTARTSYS; | |
3226 | ||
c6a113b5 | 3227 | seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
b6a1d093 TG |
3228 | |
3229 | for (i = 0; i < genpd->state_count; i++) { | |
bd40cbb0 | 3230 | idle_time += genpd->states[i].idle_time; |
b6a1d093 | 3231 | |
bd40cbb0 UH |
3232 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
3233 | now = ktime_get_mono_fast_ns(); | |
3234 | if (now > genpd->accounting_time) { | |
3235 | delta = now - genpd->accounting_time; | |
3236 | idle_time += delta; | |
3237 | } | |
3238 | } | |
b6a1d093 | 3239 | |
bd40cbb0 UH |
3240 | do_div(idle_time, NSEC_PER_MSEC); |
3241 | seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time, | |
3242 | genpd->states[i].usage, genpd->states[i].rejected); | |
b6a1d093 TG |
3243 | } |
3244 | ||
3245 | genpd_unlock(genpd); | |
3246 | return ret; | |
3247 | } | |
3248 | ||
d32dcc6c | 3249 | static int active_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3250 | { |
3251 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3252 | u64 now, on_time, delta = 0; |
b6a1d093 TG |
3253 | int ret = 0; |
3254 | ||
3255 | ret = genpd_lock_interruptible(genpd); | |
3256 | if (ret) | |
3257 | return -ERESTARTSYS; | |
3258 | ||
bd40cbb0 UH |
3259 | if (genpd->status == GENPD_STATE_ON) { |
3260 | now = ktime_get_mono_fast_ns(); | |
3261 | if (now > genpd->accounting_time) | |
3262 | delta = now - genpd->accounting_time; | |
3263 | } | |
b6a1d093 | 3264 | |
bd40cbb0 UH |
3265 | on_time = genpd->on_time + delta; |
3266 | do_div(on_time, NSEC_PER_MSEC); | |
3267 | seq_printf(s, "%llu ms\n", on_time); | |
b6a1d093 TG |
3268 | |
3269 | genpd_unlock(genpd); | |
3270 | return ret; | |
3271 | } | |
3272 | ||
d32dcc6c | 3273 | static int total_idle_time_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3274 | { |
3275 | struct generic_pm_domain *genpd = s->private; | |
bd40cbb0 | 3276 | u64 now, delta, total = 0; |
b6a1d093 TG |
3277 | unsigned int i; |
3278 | int ret = 0; | |
3279 | ||
3280 | ret = genpd_lock_interruptible(genpd); | |
3281 | if (ret) | |
3282 | return -ERESTARTSYS; | |
3283 | ||
3284 | for (i = 0; i < genpd->state_count; i++) { | |
bd40cbb0 | 3285 | total += genpd->states[i].idle_time; |
b6a1d093 | 3286 | |
bd40cbb0 UH |
3287 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
3288 | now = ktime_get_mono_fast_ns(); | |
3289 | if (now > genpd->accounting_time) { | |
3290 | delta = now - genpd->accounting_time; | |
3291 | total += delta; | |
3292 | } | |
3293 | } | |
b6a1d093 | 3294 | } |
b6a1d093 | 3295 | |
bd40cbb0 UH |
3296 | do_div(total, NSEC_PER_MSEC); |
3297 | seq_printf(s, "%llu ms\n", total); | |
b6a1d093 TG |
3298 | |
3299 | genpd_unlock(genpd); | |
3300 | return ret; | |
3301 | } | |
3302 | ||
3303 | ||
d32dcc6c | 3304 | static int devices_show(struct seq_file *s, void *data) |
b6a1d093 TG |
3305 | { |
3306 | struct generic_pm_domain *genpd = s->private; | |
3307 | struct pm_domain_data *pm_data; | |
3308 | const char *kobj_path; | |
3309 | int ret = 0; | |
3310 | ||
3311 | ret = genpd_lock_interruptible(genpd); | |
3312 | if (ret) | |
3313 | return -ERESTARTSYS; | |
3314 | ||
3315 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { | |
3316 | kobj_path = kobject_get_path(&pm_data->dev->kobj, | |
3317 | genpd_is_irq_safe(genpd) ? | |
3318 | GFP_ATOMIC : GFP_KERNEL); | |
3319 | if (kobj_path == NULL) | |
3320 | continue; | |
3321 | ||
3322 | seq_printf(s, "%s\n", kobj_path); | |
3323 | kfree(kobj_path); | |
3324 | } | |
3325 | ||
3326 | genpd_unlock(genpd); | |
3327 | return ret; | |
3328 | } | |
3329 | ||
d32dcc6c | 3330 | static int perf_state_show(struct seq_file *s, void *data) |
e8912812 RN |
3331 | { |
3332 | struct generic_pm_domain *genpd = s->private; | |
3333 | ||
3334 | if (genpd_lock_interruptible(genpd)) | |
3335 | return -ERESTARTSYS; | |
3336 | ||
3337 | seq_printf(s, "%u\n", genpd->performance_state); | |
3338 | ||
3339 | genpd_unlock(genpd); | |
3340 | return 0; | |
3341 | } | |
3342 | ||
d32dcc6c YL |
3343 | DEFINE_SHOW_ATTRIBUTE(summary); |
3344 | DEFINE_SHOW_ATTRIBUTE(status); | |
3345 | DEFINE_SHOW_ATTRIBUTE(sub_domains); | |
3346 | DEFINE_SHOW_ATTRIBUTE(idle_states); | |
3347 | DEFINE_SHOW_ATTRIBUTE(active_time); | |
3348 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); | |
3349 | DEFINE_SHOW_ATTRIBUTE(devices); | |
3350 | DEFINE_SHOW_ATTRIBUTE(perf_state); | |
2bd5306a | 3351 | |
718072ce | 3352 | static void genpd_debug_add(struct generic_pm_domain *genpd) |
2bd5306a MM |
3353 | { |
3354 | struct dentry *d; | |
718072ce TS |
3355 | |
3356 | if (!genpd_debugfs_dir) | |
3357 | return; | |
3358 | ||
3359 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); | |
3360 | ||
3361 | debugfs_create_file("current_state", 0444, | |
3362 | d, genpd, &status_fops); | |
3363 | debugfs_create_file("sub_domains", 0444, | |
3364 | d, genpd, &sub_domains_fops); | |
3365 | debugfs_create_file("idle_states", 0444, | |
3366 | d, genpd, &idle_states_fops); | |
3367 | debugfs_create_file("active_time", 0444, | |
3368 | d, genpd, &active_time_fops); | |
3369 | debugfs_create_file("total_idle_time", 0444, | |
3370 | d, genpd, &total_idle_time_fops); | |
3371 | debugfs_create_file("devices", 0444, | |
3372 | d, genpd, &devices_fops); | |
3373 | if (genpd->set_performance_state) | |
3374 | debugfs_create_file("perf_state", 0444, | |
3375 | d, genpd, &perf_state_fops); | |
3376 | } | |
3377 | ||
3378 | static int __init genpd_debug_init(void) | |
3379 | { | |
b6a1d093 | 3380 | struct generic_pm_domain *genpd; |
2bd5306a | 3381 | |
9e9704ea | 3382 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
2bd5306a | 3383 | |
e16a42c3 GKH |
3384 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
3385 | NULL, &summary_fops); | |
2bd5306a | 3386 | |
718072ce TS |
3387 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
3388 | genpd_debug_add(genpd); | |
b6a1d093 | 3389 | |
2bd5306a MM |
3390 | return 0; |
3391 | } | |
9e9704ea | 3392 | late_initcall(genpd_debug_init); |
2bd5306a | 3393 | |
9e9704ea | 3394 | static void __exit genpd_debug_exit(void) |
2bd5306a | 3395 | { |
9e9704ea | 3396 | debugfs_remove_recursive(genpd_debugfs_dir); |
2bd5306a | 3397 | } |
9e9704ea | 3398 | __exitcall(genpd_debug_exit); |
8b0510b5 | 3399 | #endif /* CONFIG_DEBUG_FS */ |