Commit | Line | Data |
---|---|---|
5de363b6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5e928f77 | 2 | /* |
62052ab1 | 3 | * drivers/base/power/runtime.c - Helper functions for device runtime PM |
5e928f77 RW |
4 | * |
5 | * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
1bfee5bc | 6 | * Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu> |
5e928f77 | 7 | */ |
5b3cc15a | 8 | #include <linux/sched/mm.h> |
8234f673 VG |
9 | #include <linux/ktime.h> |
10 | #include <linux/hrtimer.h> | |
1b6bc32f | 11 | #include <linux/export.h> |
5e928f77 | 12 | #include <linux/pm_runtime.h> |
4990d4fe | 13 | #include <linux/pm_wakeirq.h> |
c3dc2f14 | 14 | #include <trace/events/rpm.h> |
21d5c57b RW |
15 | |
16 | #include "../base.h" | |
7490e442 | 17 | #include "power.h" |
5e928f77 | 18 | |
dbcd2d72 | 19 | typedef int (*pm_callback_t)(struct device *); |
5f59df79 | 20 | |
dbcd2d72 | 21 | static pm_callback_t __rpm_get_callback(struct device *dev, size_t cb_offset) |
5f59df79 | 22 | { |
dbcd2d72 AH |
23 | pm_callback_t cb; |
24 | const struct dev_pm_ops *ops; | |
25 | ||
26 | if (dev->pm_domain) | |
27 | ops = &dev->pm_domain->ops; | |
28 | else if (dev->type && dev->type->pm) | |
29 | ops = dev->type->pm; | |
30 | else if (dev->class && dev->class->pm) | |
31 | ops = dev->class->pm; | |
32 | else if (dev->bus && dev->bus->pm) | |
33 | ops = dev->bus->pm; | |
34 | else | |
35 | ops = NULL; | |
36 | ||
37 | if (ops) | |
38 | cb = *(pm_callback_t *)((void *)ops + cb_offset); | |
39 | else | |
40 | cb = NULL; | |
41 | ||
42 | if (!cb && dev->driver && dev->driver->pm) | |
43 | cb = *(pm_callback_t *)((void *)dev->driver->pm + cb_offset); | |
44 | ||
45 | return cb; | |
5f59df79 UH |
46 | } |
47 | ||
dbcd2d72 AH |
48 | #define RPM_GET_CALLBACK(dev, callback) \ |
49 | __rpm_get_callback(dev, offsetof(struct dev_pm_ops, callback)) | |
50 | ||
140a6c94 | 51 | static int rpm_resume(struct device *dev, int rpmflags); |
7490e442 | 52 | static int rpm_suspend(struct device *dev, int rpmflags); |
5e928f77 | 53 | |
4769373c AS |
54 | /** |
55 | * update_pm_runtime_accounting - Update the time accounting of power states | |
56 | * @dev: Device to update the accounting for | |
57 | * | |
58 | * In order to be able to have time accounting of the various power states | |
59 | * (as used by programs such as PowerTOP to show the effectiveness of runtime | |
60 | * PM), we need to track the time spent in each state. | |
61 | * update_pm_runtime_accounting must be called each time before the | |
62 | * runtime_status field is updated, to account the time in the old state | |
63 | * correctly. | |
64 | */ | |
0996584b | 65 | static void update_pm_runtime_accounting(struct device *dev) |
4769373c | 66 | { |
fed7e88c | 67 | u64 now, last, delta; |
4769373c | 68 | |
fed7e88c VG |
69 | if (dev->power.disable_depth > 0) |
70 | return; | |
71 | ||
72 | last = dev->power.accounting_timestamp; | |
4769373c | 73 | |
fed7e88c | 74 | now = ktime_get_mono_fast_ns(); |
4769373c AS |
75 | dev->power.accounting_timestamp = now; |
76 | ||
c155f649 VG |
77 | /* |
78 | * Because ktime_get_mono_fast_ns() is not monotonic during | |
79 | * timekeeping updates, ensure that 'now' is after the last saved | |
80 | * timesptamp. | |
81 | */ | |
82 | if (now < last) | |
4769373c AS |
83 | return; |
84 | ||
c155f649 VG |
85 | delta = now - last; |
86 | ||
4769373c | 87 | if (dev->power.runtime_status == RPM_SUSPENDED) |
a08c2a5a | 88 | dev->power.suspended_time += delta; |
4769373c | 89 | else |
a08c2a5a | 90 | dev->power.active_time += delta; |
4769373c AS |
91 | } |
92 | ||
93 | static void __update_runtime_status(struct device *dev, enum rpm_status status) | |
94 | { | |
95 | update_pm_runtime_accounting(dev); | |
96 | dev->power.runtime_status = status; | |
97 | } | |
98 | ||
fdc56c07 | 99 | static u64 rpm_get_accounted_time(struct device *dev, bool suspended) |
8a62ffe2 | 100 | { |
a08c2a5a TG |
101 | u64 time; |
102 | unsigned long flags; | |
8a62ffe2 VG |
103 | |
104 | spin_lock_irqsave(&dev->power.lock, flags); | |
105 | ||
106 | update_pm_runtime_accounting(dev); | |
fdc56c07 | 107 | time = suspended ? dev->power.suspended_time : dev->power.active_time; |
8a62ffe2 VG |
108 | |
109 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
110 | ||
a08c2a5a | 111 | return time; |
8a62ffe2 | 112 | } |
fdc56c07 UH |
113 | |
114 | u64 pm_runtime_active_time(struct device *dev) | |
115 | { | |
116 | return rpm_get_accounted_time(dev, false); | |
117 | } | |
118 | ||
119 | u64 pm_runtime_suspended_time(struct device *dev) | |
120 | { | |
121 | return rpm_get_accounted_time(dev, true); | |
122 | } | |
8a62ffe2 VG |
123 | EXPORT_SYMBOL_GPL(pm_runtime_suspended_time); |
124 | ||
5e928f77 RW |
125 | /** |
126 | * pm_runtime_deactivate_timer - Deactivate given device's suspend timer. | |
127 | * @dev: Device to handle. | |
128 | */ | |
129 | static void pm_runtime_deactivate_timer(struct device *dev) | |
130 | { | |
131 | if (dev->power.timer_expires > 0) { | |
74fb4486 | 132 | hrtimer_try_to_cancel(&dev->power.suspend_timer); |
5e928f77 RW |
133 | dev->power.timer_expires = 0; |
134 | } | |
135 | } | |
136 | ||
137 | /** | |
138 | * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests. | |
139 | * @dev: Device to handle. | |
140 | */ | |
141 | static void pm_runtime_cancel_pending(struct device *dev) | |
142 | { | |
143 | pm_runtime_deactivate_timer(dev); | |
144 | /* | |
145 | * In case there's a request pending, make sure its work function will | |
146 | * return without doing anything. | |
147 | */ | |
148 | dev->power.request = RPM_REQ_NONE; | |
149 | } | |
150 | ||
15bcb91d AS |
151 | /* |
152 | * pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time. | |
153 | * @dev: Device to handle. | |
154 | * | |
155 | * Compute the autosuspend-delay expiration time based on the device's | |
156 | * power.last_busy time. If the delay has already expired or is disabled | |
157 | * (negative) or the power.use_autosuspend flag isn't set, return 0. | |
1f7b7081 | 158 | * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero). |
15bcb91d AS |
159 | * |
160 | * This function may be called either with or without dev->power.lock held. | |
161 | * Either way it can be racy, since power.last_busy may be updated at any time. | |
162 | */ | |
8234f673 | 163 | u64 pm_runtime_autosuspend_expiration(struct device *dev) |
15bcb91d AS |
164 | { |
165 | int autosuspend_delay; | |
f800ea32 | 166 | u64 expires; |
15bcb91d AS |
167 | |
168 | if (!dev->power.use_autosuspend) | |
f800ea32 | 169 | return 0; |
15bcb91d | 170 | |
6aa7de05 | 171 | autosuspend_delay = READ_ONCE(dev->power.autosuspend_delay); |
15bcb91d | 172 | if (autosuspend_delay < 0) |
f800ea32 | 173 | return 0; |
15bcb91d | 174 | |
f800ea32 LM |
175 | expires = READ_ONCE(dev->power.last_busy); |
176 | expires += (u64)autosuspend_delay * NSEC_PER_MSEC; | |
177 | if (expires > ktime_get_mono_fast_ns()) | |
178 | return expires; /* Expires in the future */ | |
15bcb91d | 179 | |
f800ea32 | 180 | return 0; |
15bcb91d AS |
181 | } |
182 | EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration); | |
183 | ||
e823407f ML |
184 | static int dev_memalloc_noio(struct device *dev, void *data) |
185 | { | |
186 | return dev->power.memalloc_noio; | |
187 | } | |
188 | ||
189 | /* | |
190 | * pm_runtime_set_memalloc_noio - Set a device's memalloc_noio flag. | |
191 | * @dev: Device to handle. | |
192 | * @enable: True for setting the flag and False for clearing the flag. | |
193 | * | |
194 | * Set the flag for all devices in the path from the device to the | |
195 | * root device in the device tree if @enable is true, otherwise clear | |
196 | * the flag for devices in the path whose siblings don't set the flag. | |
197 | * | |
198 | * The function should only be called by block device, or network | |
199 | * device driver for solving the deadlock problem during runtime | |
200 | * resume/suspend: | |
201 | * | |
202 | * If memory allocation with GFP_KERNEL is called inside runtime | |
203 | * resume/suspend callback of any one of its ancestors(or the | |
204 | * block device itself), the deadlock may be triggered inside the | |
205 | * memory allocation since it might not complete until the block | |
206 | * device becomes active and the involed page I/O finishes. The | |
207 | * situation is pointed out first by Alan Stern. Network device | |
208 | * are involved in iSCSI kind of situation. | |
209 | * | |
210 | * The lock of dev_hotplug_mutex is held in the function for handling | |
211 | * hotplug race because pm_runtime_set_memalloc_noio() may be called | |
212 | * in async probe(). | |
213 | * | |
214 | * The function should be called between device_add() and device_del() | |
215 | * on the affected device(block/network device). | |
216 | */ | |
217 | void pm_runtime_set_memalloc_noio(struct device *dev, bool enable) | |
218 | { | |
219 | static DEFINE_MUTEX(dev_hotplug_mutex); | |
220 | ||
221 | mutex_lock(&dev_hotplug_mutex); | |
222 | for (;;) { | |
223 | bool enabled; | |
224 | ||
225 | /* hold power lock since bitfield is not SMP-safe. */ | |
226 | spin_lock_irq(&dev->power.lock); | |
227 | enabled = dev->power.memalloc_noio; | |
228 | dev->power.memalloc_noio = enable; | |
229 | spin_unlock_irq(&dev->power.lock); | |
230 | ||
231 | /* | |
232 | * not need to enable ancestors any more if the device | |
233 | * has been enabled. | |
234 | */ | |
235 | if (enabled && enable) | |
236 | break; | |
237 | ||
238 | dev = dev->parent; | |
239 | ||
240 | /* | |
241 | * clear flag of the parent device only if all the | |
242 | * children don't set the flag because ancestor's | |
243 | * flag was set by any one of the descendants. | |
244 | */ | |
245 | if (!dev || (!enable && | |
246 | device_for_each_child(dev, NULL, | |
247 | dev_memalloc_noio))) | |
248 | break; | |
249 | } | |
250 | mutex_unlock(&dev_hotplug_mutex); | |
251 | } | |
252 | EXPORT_SYMBOL_GPL(pm_runtime_set_memalloc_noio); | |
253 | ||
5e928f77 | 254 | /** |
1bfee5bc AS |
255 | * rpm_check_suspend_allowed - Test whether a device may be suspended. |
256 | * @dev: Device to test. | |
5e928f77 | 257 | */ |
1bfee5bc | 258 | static int rpm_check_suspend_allowed(struct device *dev) |
5e928f77 RW |
259 | { |
260 | int retval = 0; | |
261 | ||
5e928f77 RW |
262 | if (dev->power.runtime_error) |
263 | retval = -EINVAL; | |
632e270e RW |
264 | else if (dev->power.disable_depth > 0) |
265 | retval = -EACCES; | |
266 | else if (atomic_read(&dev->power.usage_count) > 0) | |
5e928f77 | 267 | retval = -EAGAIN; |
62006c17 UH |
268 | else if (!dev->power.ignore_children && |
269 | atomic_read(&dev->power.child_count)) | |
5e928f77 | 270 | retval = -EBUSY; |
1bfee5bc AS |
271 | |
272 | /* Pending resume requests take precedence over suspends. */ | |
273 | else if ((dev->power.deferred_resume | |
78ca7c37 | 274 | && dev->power.runtime_status == RPM_SUSPENDING) |
1bfee5bc AS |
275 | || (dev->power.request_pending |
276 | && dev->power.request == RPM_REQ_RESUME)) | |
277 | retval = -EAGAIN; | |
8262331e | 278 | else if (__dev_pm_qos_resume_latency(dev) == 0) |
55d7ec45 | 279 | retval = -EPERM; |
1bfee5bc AS |
280 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
281 | retval = 1; | |
282 | ||
283 | return retval; | |
284 | } | |
285 | ||
21d5c57b RW |
286 | static int rpm_get_suppliers(struct device *dev) |
287 | { | |
288 | struct device_link *link; | |
289 | ||
290 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { | |
291 | int retval; | |
292 | ||
e2f3cd83 RW |
293 | if (!(link->flags & DL_FLAG_PM_RUNTIME) || |
294 | READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) | |
21d5c57b RW |
295 | continue; |
296 | ||
297 | retval = pm_runtime_get_sync(link->supplier); | |
31eb7431 RW |
298 | /* Ignore suppliers with disabled runtime PM. */ |
299 | if (retval < 0 && retval != -EACCES) { | |
21d5c57b RW |
300 | pm_runtime_put_noidle(link->supplier); |
301 | return retval; | |
302 | } | |
e2f3cd83 | 303 | refcount_inc(&link->rpm_active); |
21d5c57b RW |
304 | } |
305 | return 0; | |
306 | } | |
307 | ||
308 | static void rpm_put_suppliers(struct device *dev) | |
309 | { | |
310 | struct device_link *link; | |
311 | ||
e2f3cd83 RW |
312 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { |
313 | if (READ_ONCE(link->status) == DL_STATE_SUPPLIER_UNBIND) | |
314 | continue; | |
315 | ||
316 | while (refcount_dec_not_one(&link->rpm_active)) | |
21d5c57b | 317 | pm_runtime_put(link->supplier); |
e2f3cd83 | 318 | } |
21d5c57b RW |
319 | } |
320 | ||
ad3c36a5 RW |
321 | /** |
322 | * __rpm_callback - Run a given runtime PM callback for a given device. | |
323 | * @cb: Runtime PM callback to run. | |
324 | * @dev: Device to run the callback for. | |
325 | */ | |
326 | static int __rpm_callback(int (*cb)(struct device *), struct device *dev) | |
327 | __releases(&dev->power.lock) __acquires(&dev->power.lock) | |
328 | { | |
21d5c57b | 329 | int retval, idx; |
baa8809f | 330 | bool use_links = dev->power.links_count > 0; |
ad3c36a5 | 331 | |
21d5c57b | 332 | if (dev->power.irq_safe) { |
ad3c36a5 | 333 | spin_unlock(&dev->power.lock); |
21d5c57b | 334 | } else { |
ad3c36a5 RW |
335 | spin_unlock_irq(&dev->power.lock); |
336 | ||
21d5c57b RW |
337 | /* |
338 | * Resume suppliers if necessary. | |
339 | * | |
340 | * The device's runtime PM status cannot change until this | |
341 | * routine returns, so it is safe to read the status outside of | |
342 | * the lock. | |
343 | */ | |
baa8809f | 344 | if (use_links && dev->power.runtime_status == RPM_RESUMING) { |
21d5c57b RW |
345 | idx = device_links_read_lock(); |
346 | ||
347 | retval = rpm_get_suppliers(dev); | |
348 | if (retval) | |
349 | goto fail; | |
350 | ||
351 | device_links_read_unlock(idx); | |
352 | } | |
353 | } | |
354 | ||
ad3c36a5 RW |
355 | retval = cb(dev); |
356 | ||
21d5c57b | 357 | if (dev->power.irq_safe) { |
ad3c36a5 | 358 | spin_lock(&dev->power.lock); |
21d5c57b RW |
359 | } else { |
360 | /* | |
361 | * If the device is suspending and the callback has returned | |
362 | * success, drop the usage counters of the suppliers that have | |
363 | * been reference counted on its resume. | |
364 | * | |
365 | * Do that if resume fails too. | |
366 | */ | |
baa8809f RW |
367 | if (use_links |
368 | && ((dev->power.runtime_status == RPM_SUSPENDING && !retval) | |
369 | || (dev->power.runtime_status == RPM_RESUMING && retval))) { | |
21d5c57b RW |
370 | idx = device_links_read_lock(); |
371 | ||
372 | fail: | |
373 | rpm_put_suppliers(dev); | |
374 | ||
375 | device_links_read_unlock(idx); | |
376 | } | |
377 | ||
ad3c36a5 | 378 | spin_lock_irq(&dev->power.lock); |
21d5c57b | 379 | } |
ad3c36a5 RW |
380 | |
381 | return retval; | |
382 | } | |
383 | ||
1bfee5bc | 384 | /** |
140a6c94 | 385 | * rpm_idle - Notify device bus type if the device can be suspended. |
1bfee5bc AS |
386 | * @dev: Device to notify the bus type about. |
387 | * @rpmflags: Flag bits. | |
388 | * | |
62052ab1 | 389 | * Check if the device's runtime PM status allows it to be suspended. If |
1bfee5bc AS |
390 | * another idle notification has been started earlier, return immediately. If |
391 | * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise | |
d66e6db2 UH |
392 | * run the ->runtime_idle() callback directly. If the ->runtime_idle callback |
393 | * doesn't exist or if it returns 0, call rpm_suspend with the RPM_AUTO flag. | |
1bfee5bc AS |
394 | * |
395 | * This function must be called under dev->power.lock with interrupts disabled. | |
396 | */ | |
140a6c94 | 397 | static int rpm_idle(struct device *dev, int rpmflags) |
1bfee5bc | 398 | { |
71c63122 | 399 | int (*callback)(struct device *); |
1bfee5bc AS |
400 | int retval; |
401 | ||
d7737ce9 | 402 | trace_rpm_idle_rcuidle(dev, rpmflags); |
1bfee5bc AS |
403 | retval = rpm_check_suspend_allowed(dev); |
404 | if (retval < 0) | |
405 | ; /* Conditions are wrong. */ | |
406 | ||
407 | /* Idle notifications are allowed only in the RPM_ACTIVE state. */ | |
408 | else if (dev->power.runtime_status != RPM_ACTIVE) | |
409 | retval = -EAGAIN; | |
410 | ||
411 | /* | |
412 | * Any pending request other than an idle notification takes | |
413 | * precedence over us, except that the timer may be running. | |
414 | */ | |
415 | else if (dev->power.request_pending && | |
416 | dev->power.request > RPM_REQ_IDLE) | |
417 | retval = -EAGAIN; | |
418 | ||
419 | /* Act as though RPM_NOWAIT is always set. */ | |
420 | else if (dev->power.idle_notification) | |
421 | retval = -EINPROGRESS; | |
5e928f77 RW |
422 | if (retval) |
423 | goto out; | |
424 | ||
1bfee5bc AS |
425 | /* Pending requests need to be canceled. */ |
426 | dev->power.request = RPM_REQ_NONE; | |
427 | ||
45f0a85c | 428 | if (dev->power.no_callbacks) |
7490e442 | 429 | goto out; |
7490e442 | 430 | |
1bfee5bc AS |
431 | /* Carry out an asynchronous or a synchronous idle notification. */ |
432 | if (rpmflags & RPM_ASYNC) { | |
433 | dev->power.request = RPM_REQ_IDLE; | |
434 | if (!dev->power.request_pending) { | |
435 | dev->power.request_pending = true; | |
436 | queue_work(pm_wq, &dev->power.work); | |
5e928f77 | 437 | } |
d7737ce9 | 438 | trace_rpm_return_int_rcuidle(dev, _THIS_IP_, 0); |
45f0a85c | 439 | return 0; |
5e928f77 RW |
440 | } |
441 | ||
442 | dev->power.idle_notification = true; | |
443 | ||
dbcd2d72 | 444 | callback = RPM_GET_CALLBACK(dev, runtime_idle); |
35cd133c | 445 | |
ad3c36a5 | 446 | if (callback) |
45f0a85c | 447 | retval = __rpm_callback(callback, dev); |
5e928f77 RW |
448 | |
449 | dev->power.idle_notification = false; | |
450 | wake_up_all(&dev->power.wait_queue); | |
451 | ||
452 | out: | |
d7737ce9 | 453 | trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval); |
d66e6db2 | 454 | return retval ? retval : rpm_suspend(dev, rpmflags | RPM_AUTO); |
5e928f77 RW |
455 | } |
456 | ||
71c63122 RW |
457 | /** |
458 | * rpm_callback - Run a given runtime PM callback for a given device. | |
459 | * @cb: Runtime PM callback to run. | |
460 | * @dev: Device to run the callback for. | |
461 | */ | |
462 | static int rpm_callback(int (*cb)(struct device *), struct device *dev) | |
71c63122 RW |
463 | { |
464 | int retval; | |
465 | ||
466 | if (!cb) | |
467 | return -ENOSYS; | |
468 | ||
db88175f ML |
469 | if (dev->power.memalloc_noio) { |
470 | unsigned int noio_flag; | |
471 | ||
472 | /* | |
473 | * Deadlock might be caused if memory allocation with | |
474 | * GFP_KERNEL happens inside runtime_suspend and | |
475 | * runtime_resume callbacks of one block device's | |
476 | * ancestor or the block device itself. Network | |
477 | * device might be thought as part of iSCSI block | |
478 | * device, so network device and its ancestor should | |
479 | * be marked as memalloc_noio too. | |
480 | */ | |
481 | noio_flag = memalloc_noio_save(); | |
482 | retval = __rpm_callback(cb, dev); | |
483 | memalloc_noio_restore(noio_flag); | |
484 | } else { | |
485 | retval = __rpm_callback(cb, dev); | |
486 | } | |
71c63122 | 487 | |
71c63122 | 488 | dev->power.runtime_error = retval; |
632e270e | 489 | return retval != -EACCES ? retval : -EIO; |
71c63122 RW |
490 | } |
491 | ||
5e928f77 | 492 | /** |
62052ab1 | 493 | * rpm_suspend - Carry out runtime suspend of given device. |
5e928f77 | 494 | * @dev: Device to suspend. |
3f9af051 | 495 | * @rpmflags: Flag bits. |
5e928f77 | 496 | * |
47d8f0ba ML |
497 | * Check if the device's runtime PM status allows it to be suspended. |
498 | * Cancel a pending idle notification, autosuspend or suspend. If | |
499 | * another suspend has been started earlier, either return immediately | |
500 | * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC | |
501 | * flags. If the RPM_ASYNC flag is set then queue a suspend request; | |
857b36c7 ML |
502 | * otherwise run the ->runtime_suspend() callback directly. When |
503 | * ->runtime_suspend succeeded, if a deferred resume was requested while | |
504 | * the callback was running then carry it out, otherwise send an idle | |
505 | * notification for its parent (if the suspend succeeded and both | |
506 | * ignore_children of parent->power and irq_safe of dev->power are not set). | |
886486b7 AS |
507 | * If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO |
508 | * flag is set and the next autosuspend-delay expiration time is in the | |
509 | * future, schedule another autosuspend attempt. | |
5e928f77 RW |
510 | * |
511 | * This function must be called under dev->power.lock with interrupts disabled. | |
512 | */ | |
140a6c94 | 513 | static int rpm_suspend(struct device *dev, int rpmflags) |
5e928f77 RW |
514 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
515 | { | |
71c63122 | 516 | int (*callback)(struct device *); |
5e928f77 | 517 | struct device *parent = NULL; |
1bfee5bc | 518 | int retval; |
5e928f77 | 519 | |
77893577 | 520 | trace_rpm_suspend_rcuidle(dev, rpmflags); |
5e928f77 RW |
521 | |
522 | repeat: | |
1bfee5bc | 523 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 | 524 | |
1bfee5bc AS |
525 | if (retval < 0) |
526 | ; /* Conditions are wrong. */ | |
527 | ||
528 | /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ | |
529 | else if (dev->power.runtime_status == RPM_RESUMING && | |
530 | !(rpmflags & RPM_ASYNC)) | |
5e928f77 | 531 | retval = -EAGAIN; |
1bfee5bc | 532 | if (retval) |
5e928f77 | 533 | goto out; |
5e928f77 | 534 | |
15bcb91d AS |
535 | /* If the autosuspend_delay time hasn't expired yet, reschedule. */ |
536 | if ((rpmflags & RPM_AUTO) | |
537 | && dev->power.runtime_status != RPM_SUSPENDING) { | |
8234f673 | 538 | u64 expires = pm_runtime_autosuspend_expiration(dev); |
15bcb91d AS |
539 | |
540 | if (expires != 0) { | |
541 | /* Pending requests need to be canceled. */ | |
542 | dev->power.request = RPM_REQ_NONE; | |
543 | ||
544 | /* | |
545 | * Optimization: If the timer is already running and is | |
546 | * set to expire at or before the autosuspend delay, | |
547 | * avoid the overhead of resetting it. Just let it | |
548 | * expire; pm_suspend_timer_fn() will take care of the | |
549 | * rest. | |
550 | */ | |
8234f673 VG |
551 | if (!(dev->power.timer_expires && |
552 | dev->power.timer_expires <= expires)) { | |
553 | /* | |
554 | * We add a slack of 25% to gather wakeups | |
555 | * without sacrificing the granularity. | |
556 | */ | |
ca27e4cd | 557 | u64 slack = (u64)READ_ONCE(dev->power.autosuspend_delay) * |
8234f673 VG |
558 | (NSEC_PER_MSEC >> 2); |
559 | ||
15bcb91d | 560 | dev->power.timer_expires = expires; |
8234f673 VG |
561 | hrtimer_start_range_ns(&dev->power.suspend_timer, |
562 | ns_to_ktime(expires), | |
563 | slack, | |
564 | HRTIMER_MODE_ABS); | |
15bcb91d AS |
565 | } |
566 | dev->power.timer_autosuspends = 1; | |
567 | goto out; | |
568 | } | |
569 | } | |
570 | ||
5e928f77 RW |
571 | /* Other scheduled or pending requests need to be canceled. */ |
572 | pm_runtime_cancel_pending(dev); | |
573 | ||
5e928f77 RW |
574 | if (dev->power.runtime_status == RPM_SUSPENDING) { |
575 | DEFINE_WAIT(wait); | |
576 | ||
1bfee5bc | 577 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
578 | retval = -EINPROGRESS; |
579 | goto out; | |
580 | } | |
581 | ||
ad3c36a5 RW |
582 | if (dev->power.irq_safe) { |
583 | spin_unlock(&dev->power.lock); | |
584 | ||
585 | cpu_relax(); | |
586 | ||
587 | spin_lock(&dev->power.lock); | |
588 | goto repeat; | |
589 | } | |
590 | ||
5e928f77 RW |
591 | /* Wait for the other suspend running in parallel with us. */ |
592 | for (;;) { | |
593 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
594 | TASK_UNINTERRUPTIBLE); | |
595 | if (dev->power.runtime_status != RPM_SUSPENDING) | |
596 | break; | |
597 | ||
598 | spin_unlock_irq(&dev->power.lock); | |
599 | ||
600 | schedule(); | |
601 | ||
602 | spin_lock_irq(&dev->power.lock); | |
603 | } | |
604 | finish_wait(&dev->power.wait_queue, &wait); | |
605 | goto repeat; | |
606 | } | |
607 | ||
7490e442 AS |
608 | if (dev->power.no_callbacks) |
609 | goto no_callback; /* Assume success. */ | |
610 | ||
1bfee5bc AS |
611 | /* Carry out an asynchronous or a synchronous suspend. */ |
612 | if (rpmflags & RPM_ASYNC) { | |
15bcb91d AS |
613 | dev->power.request = (rpmflags & RPM_AUTO) ? |
614 | RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; | |
1bfee5bc AS |
615 | if (!dev->power.request_pending) { |
616 | dev->power.request_pending = true; | |
617 | queue_work(pm_wq, &dev->power.work); | |
618 | } | |
619 | goto out; | |
620 | } | |
621 | ||
8d4b9d1b | 622 | __update_runtime_status(dev, RPM_SUSPENDING); |
5e928f77 | 623 | |
dbcd2d72 | 624 | callback = RPM_GET_CALLBACK(dev, runtime_suspend); |
35cd133c | 625 | |
bed57030 | 626 | dev_pm_enable_wake_irq_check(dev, true); |
71c63122 | 627 | retval = rpm_callback(callback, dev); |
00dc9ad1 RW |
628 | if (retval) |
629 | goto fail; | |
886486b7 | 630 | |
7490e442 | 631 | no_callback: |
857b36c7 ML |
632 | __update_runtime_status(dev, RPM_SUSPENDED); |
633 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 634 | |
857b36c7 ML |
635 | if (dev->parent) { |
636 | parent = dev->parent; | |
637 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
5e928f77 RW |
638 | } |
639 | wake_up_all(&dev->power.wait_queue); | |
640 | ||
641 | if (dev->power.deferred_resume) { | |
58a34de7 | 642 | dev->power.deferred_resume = false; |
140a6c94 | 643 | rpm_resume(dev, 0); |
5e928f77 RW |
644 | retval = -EAGAIN; |
645 | goto out; | |
646 | } | |
647 | ||
c3810c88 | 648 | /* Maybe the parent is now able to suspend. */ |
c7b61de5 | 649 | if (parent && !parent->power.ignore_children && !dev->power.irq_safe) { |
c3810c88 | 650 | spin_unlock(&dev->power.lock); |
5e928f77 | 651 | |
c3810c88 AS |
652 | spin_lock(&parent->power.lock); |
653 | rpm_idle(parent, RPM_ASYNC); | |
654 | spin_unlock(&parent->power.lock); | |
5e928f77 | 655 | |
c3810c88 | 656 | spin_lock(&dev->power.lock); |
5e928f77 RW |
657 | } |
658 | ||
659 | out: | |
77893577 | 660 | trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval); |
5e928f77 RW |
661 | |
662 | return retval; | |
00dc9ad1 RW |
663 | |
664 | fail: | |
bed57030 | 665 | dev_pm_disable_wake_irq_check(dev); |
00dc9ad1 | 666 | __update_runtime_status(dev, RPM_ACTIVE); |
00dc9ad1 | 667 | dev->power.deferred_resume = false; |
f2791d73 AS |
668 | wake_up_all(&dev->power.wait_queue); |
669 | ||
00dc9ad1 RW |
670 | if (retval == -EAGAIN || retval == -EBUSY) { |
671 | dev->power.runtime_error = 0; | |
672 | ||
673 | /* | |
674 | * If the callback routine failed an autosuspend, and | |
675 | * if the last_busy time has been updated so that there | |
676 | * is a new autosuspend expiration time, automatically | |
677 | * reschedule another autosuspend. | |
678 | */ | |
679 | if ((rpmflags & RPM_AUTO) && | |
680 | pm_runtime_autosuspend_expiration(dev) != 0) | |
681 | goto repeat; | |
682 | } else { | |
683 | pm_runtime_cancel_pending(dev); | |
684 | } | |
00dc9ad1 | 685 | goto out; |
5e928f77 RW |
686 | } |
687 | ||
688 | /** | |
62052ab1 | 689 | * rpm_resume - Carry out runtime resume of given device. |
5e928f77 | 690 | * @dev: Device to resume. |
3f9af051 | 691 | * @rpmflags: Flag bits. |
5e928f77 | 692 | * |
62052ab1 | 693 | * Check if the device's runtime PM status allows it to be resumed. Cancel |
1bfee5bc | 694 | * any scheduled or pending requests. If another resume has been started |
25985edc | 695 | * earlier, either return immediately or wait for it to finish, depending on the |
1bfee5bc AS |
696 | * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in |
697 | * parallel with this function, either tell the other process to resume after | |
698 | * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC | |
699 | * flag is set then queue a resume request; otherwise run the | |
700 | * ->runtime_resume() callback directly. Queue an idle notification for the | |
701 | * device if the resume succeeded. | |
5e928f77 RW |
702 | * |
703 | * This function must be called under dev->power.lock with interrupts disabled. | |
704 | */ | |
140a6c94 | 705 | static int rpm_resume(struct device *dev, int rpmflags) |
5e928f77 RW |
706 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
707 | { | |
71c63122 | 708 | int (*callback)(struct device *); |
5e928f77 RW |
709 | struct device *parent = NULL; |
710 | int retval = 0; | |
711 | ||
d44c950e | 712 | trace_rpm_resume_rcuidle(dev, rpmflags); |
5e928f77 RW |
713 | |
714 | repeat: | |
1bfee5bc | 715 | if (dev->power.runtime_error) |
5e928f77 | 716 | retval = -EINVAL; |
6f3c77b0 KH |
717 | else if (dev->power.disable_depth == 1 && dev->power.is_suspended |
718 | && dev->power.runtime_status == RPM_ACTIVE) | |
719 | retval = 1; | |
1bfee5bc | 720 | else if (dev->power.disable_depth > 0) |
632e270e | 721 | retval = -EACCES; |
1bfee5bc | 722 | if (retval) |
5e928f77 | 723 | goto out; |
5e928f77 | 724 | |
15bcb91d AS |
725 | /* |
726 | * Other scheduled or pending requests need to be canceled. Small | |
727 | * optimization: If an autosuspend timer is running, leave it running | |
728 | * rather than cancelling it now only to restart it again in the near | |
729 | * future. | |
730 | */ | |
731 | dev->power.request = RPM_REQ_NONE; | |
732 | if (!dev->power.timer_autosuspends) | |
733 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 734 | |
1bfee5bc | 735 | if (dev->power.runtime_status == RPM_ACTIVE) { |
5e928f77 | 736 | retval = 1; |
5e928f77 | 737 | goto out; |
1bfee5bc | 738 | } |
5e928f77 RW |
739 | |
740 | if (dev->power.runtime_status == RPM_RESUMING | |
741 | || dev->power.runtime_status == RPM_SUSPENDING) { | |
742 | DEFINE_WAIT(wait); | |
743 | ||
1bfee5bc | 744 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
745 | if (dev->power.runtime_status == RPM_SUSPENDING) |
746 | dev->power.deferred_resume = true; | |
1bfee5bc AS |
747 | else |
748 | retval = -EINPROGRESS; | |
5e928f77 RW |
749 | goto out; |
750 | } | |
751 | ||
ad3c36a5 RW |
752 | if (dev->power.irq_safe) { |
753 | spin_unlock(&dev->power.lock); | |
754 | ||
755 | cpu_relax(); | |
756 | ||
757 | spin_lock(&dev->power.lock); | |
758 | goto repeat; | |
759 | } | |
760 | ||
5e928f77 RW |
761 | /* Wait for the operation carried out in parallel with us. */ |
762 | for (;;) { | |
763 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
764 | TASK_UNINTERRUPTIBLE); | |
765 | if (dev->power.runtime_status != RPM_RESUMING | |
766 | && dev->power.runtime_status != RPM_SUSPENDING) | |
767 | break; | |
768 | ||
769 | spin_unlock_irq(&dev->power.lock); | |
770 | ||
771 | schedule(); | |
772 | ||
773 | spin_lock_irq(&dev->power.lock); | |
774 | } | |
775 | finish_wait(&dev->power.wait_queue, &wait); | |
776 | goto repeat; | |
777 | } | |
778 | ||
7490e442 AS |
779 | /* |
780 | * See if we can skip waking up the parent. This is safe only if | |
781 | * power.no_callbacks is set, because otherwise we don't know whether | |
782 | * the resume will actually succeed. | |
783 | */ | |
784 | if (dev->power.no_callbacks && !parent && dev->parent) { | |
d63be5f9 | 785 | spin_lock_nested(&dev->parent->power.lock, SINGLE_DEPTH_NESTING); |
7490e442 AS |
786 | if (dev->parent->power.disable_depth > 0 |
787 | || dev->parent->power.ignore_children | |
788 | || dev->parent->power.runtime_status == RPM_ACTIVE) { | |
789 | atomic_inc(&dev->parent->power.child_count); | |
790 | spin_unlock(&dev->parent->power.lock); | |
7f321c26 | 791 | retval = 1; |
7490e442 AS |
792 | goto no_callback; /* Assume success. */ |
793 | } | |
794 | spin_unlock(&dev->parent->power.lock); | |
795 | } | |
796 | ||
1bfee5bc AS |
797 | /* Carry out an asynchronous or a synchronous resume. */ |
798 | if (rpmflags & RPM_ASYNC) { | |
799 | dev->power.request = RPM_REQ_RESUME; | |
800 | if (!dev->power.request_pending) { | |
801 | dev->power.request_pending = true; | |
802 | queue_work(pm_wq, &dev->power.work); | |
803 | } | |
804 | retval = 0; | |
805 | goto out; | |
806 | } | |
807 | ||
5e928f77 RW |
808 | if (!parent && dev->parent) { |
809 | /* | |
c7b61de5 AS |
810 | * Increment the parent's usage counter and resume it if |
811 | * necessary. Not needed if dev is irq-safe; then the | |
812 | * parent is permanently resumed. | |
5e928f77 RW |
813 | */ |
814 | parent = dev->parent; | |
c7b61de5 AS |
815 | if (dev->power.irq_safe) |
816 | goto skip_parent; | |
862f89b3 | 817 | spin_unlock(&dev->power.lock); |
5e928f77 RW |
818 | |
819 | pm_runtime_get_noresume(parent); | |
820 | ||
862f89b3 | 821 | spin_lock(&parent->power.lock); |
5e928f77 | 822 | /* |
216ef0b6 UH |
823 | * Resume the parent if it has runtime PM enabled and not been |
824 | * set to ignore its children. | |
5e928f77 RW |
825 | */ |
826 | if (!parent->power.disable_depth | |
827 | && !parent->power.ignore_children) { | |
140a6c94 | 828 | rpm_resume(parent, 0); |
5e928f77 RW |
829 | if (parent->power.runtime_status != RPM_ACTIVE) |
830 | retval = -EBUSY; | |
831 | } | |
862f89b3 | 832 | spin_unlock(&parent->power.lock); |
5e928f77 | 833 | |
862f89b3 | 834 | spin_lock(&dev->power.lock); |
5e928f77 RW |
835 | if (retval) |
836 | goto out; | |
837 | goto repeat; | |
838 | } | |
c7b61de5 | 839 | skip_parent: |
5e928f77 | 840 | |
7490e442 AS |
841 | if (dev->power.no_callbacks) |
842 | goto no_callback; /* Assume success. */ | |
843 | ||
8d4b9d1b | 844 | __update_runtime_status(dev, RPM_RESUMING); |
5e928f77 | 845 | |
dbcd2d72 | 846 | callback = RPM_GET_CALLBACK(dev, runtime_resume); |
35cd133c | 847 | |
bed57030 | 848 | dev_pm_disable_wake_irq_check(dev); |
71c63122 | 849 | retval = rpm_callback(callback, dev); |
5e928f77 | 850 | if (retval) { |
8d4b9d1b | 851 | __update_runtime_status(dev, RPM_SUSPENDED); |
5e928f77 | 852 | pm_runtime_cancel_pending(dev); |
bed57030 | 853 | dev_pm_enable_wake_irq_check(dev, false); |
5e928f77 | 854 | } else { |
7490e442 | 855 | no_callback: |
8d4b9d1b | 856 | __update_runtime_status(dev, RPM_ACTIVE); |
56f487c7 | 857 | pm_runtime_mark_last_busy(dev); |
5e928f77 RW |
858 | if (parent) |
859 | atomic_inc(&parent->power.child_count); | |
860 | } | |
861 | wake_up_all(&dev->power.wait_queue); | |
862 | ||
7f321c26 | 863 | if (retval >= 0) |
140a6c94 | 864 | rpm_idle(dev, RPM_ASYNC); |
5e928f77 RW |
865 | |
866 | out: | |
c7b61de5 | 867 | if (parent && !dev->power.irq_safe) { |
5e928f77 RW |
868 | spin_unlock_irq(&dev->power.lock); |
869 | ||
870 | pm_runtime_put(parent); | |
871 | ||
872 | spin_lock_irq(&dev->power.lock); | |
873 | } | |
874 | ||
d44c950e | 875 | trace_rpm_return_int_rcuidle(dev, _THIS_IP_, retval); |
5e928f77 RW |
876 | |
877 | return retval; | |
878 | } | |
879 | ||
5e928f77 | 880 | /** |
62052ab1 | 881 | * pm_runtime_work - Universal runtime PM work function. |
5e928f77 RW |
882 | * @work: Work structure used for scheduling the execution of this function. |
883 | * | |
884 | * Use @work to get the device object the work is to be done for, determine what | |
62052ab1 | 885 | * is to be done and execute the appropriate runtime PM function. |
5e928f77 RW |
886 | */ |
887 | static void pm_runtime_work(struct work_struct *work) | |
888 | { | |
889 | struct device *dev = container_of(work, struct device, power.work); | |
890 | enum rpm_request req; | |
891 | ||
892 | spin_lock_irq(&dev->power.lock); | |
893 | ||
894 | if (!dev->power.request_pending) | |
895 | goto out; | |
896 | ||
897 | req = dev->power.request; | |
898 | dev->power.request = RPM_REQ_NONE; | |
899 | dev->power.request_pending = false; | |
900 | ||
901 | switch (req) { | |
902 | case RPM_REQ_NONE: | |
903 | break; | |
904 | case RPM_REQ_IDLE: | |
140a6c94 | 905 | rpm_idle(dev, RPM_NOWAIT); |
5e928f77 RW |
906 | break; |
907 | case RPM_REQ_SUSPEND: | |
140a6c94 | 908 | rpm_suspend(dev, RPM_NOWAIT); |
5e928f77 | 909 | break; |
15bcb91d AS |
910 | case RPM_REQ_AUTOSUSPEND: |
911 | rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); | |
912 | break; | |
5e928f77 | 913 | case RPM_REQ_RESUME: |
140a6c94 | 914 | rpm_resume(dev, RPM_NOWAIT); |
5e928f77 RW |
915 | break; |
916 | } | |
917 | ||
918 | out: | |
919 | spin_unlock_irq(&dev->power.lock); | |
920 | } | |
921 | ||
5e928f77 RW |
922 | /** |
923 | * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). | |
924 | * @data: Device pointer passed by pm_schedule_suspend(). | |
925 | * | |
1bfee5bc | 926 | * Check if the time is right and queue a suspend request. |
5e928f77 | 927 | */ |
8234f673 | 928 | static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer) |
5e928f77 | 929 | { |
8234f673 | 930 | struct device *dev = container_of(timer, struct device, power.suspend_timer); |
5e928f77 | 931 | unsigned long flags; |
8234f673 | 932 | u64 expires; |
5e928f77 RW |
933 | |
934 | spin_lock_irqsave(&dev->power.lock, flags); | |
935 | ||
936 | expires = dev->power.timer_expires; | |
1f7b7081 LM |
937 | /* |
938 | * If 'expires' is after the current time, we've been called | |
939 | * too early. | |
940 | */ | |
15efb47d | 941 | if (expires > 0 && expires < ktime_get_mono_fast_ns()) { |
5e928f77 | 942 | dev->power.timer_expires = 0; |
15bcb91d AS |
943 | rpm_suspend(dev, dev->power.timer_autosuspends ? |
944 | (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); | |
5e928f77 RW |
945 | } |
946 | ||
947 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
8234f673 VG |
948 | |
949 | return HRTIMER_NORESTART; | |
5e928f77 RW |
950 | } |
951 | ||
952 | /** | |
953 | * pm_schedule_suspend - Set up a timer to submit a suspend request in future. | |
954 | * @dev: Device to suspend. | |
955 | * @delay: Time to wait before submitting a suspend request, in milliseconds. | |
956 | */ | |
957 | int pm_schedule_suspend(struct device *dev, unsigned int delay) | |
958 | { | |
959 | unsigned long flags; | |
15efb47d | 960 | u64 expires; |
1bfee5bc | 961 | int retval; |
5e928f77 RW |
962 | |
963 | spin_lock_irqsave(&dev->power.lock, flags); | |
964 | ||
5e928f77 | 965 | if (!delay) { |
140a6c94 | 966 | retval = rpm_suspend(dev, RPM_ASYNC); |
5e928f77 RW |
967 | goto out; |
968 | } | |
969 | ||
1bfee5bc | 970 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 RW |
971 | if (retval) |
972 | goto out; | |
973 | ||
1bfee5bc AS |
974 | /* Other scheduled or pending requests need to be canceled. */ |
975 | pm_runtime_cancel_pending(dev); | |
976 | ||
15efb47d VG |
977 | expires = ktime_get_mono_fast_ns() + (u64)delay * NSEC_PER_MSEC; |
978 | dev->power.timer_expires = expires; | |
15bcb91d | 979 | dev->power.timer_autosuspends = 0; |
8234f673 | 980 | hrtimer_start(&dev->power.suspend_timer, expires, HRTIMER_MODE_ABS); |
5e928f77 RW |
981 | |
982 | out: | |
983 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
984 | ||
985 | return retval; | |
986 | } | |
987 | EXPORT_SYMBOL_GPL(pm_schedule_suspend); | |
988 | ||
5e928f77 | 989 | /** |
62052ab1 | 990 | * __pm_runtime_idle - Entry point for runtime idle operations. |
140a6c94 AS |
991 | * @dev: Device to send idle notification for. |
992 | * @rpmflags: Flag bits. | |
993 | * | |
994 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and | |
995 | * return immediately if it is larger than zero. Then carry out an idle | |
996 | * notification, either synchronous or asynchronous. | |
997 | * | |
311aab73 CC |
998 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
999 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 1000 | */ |
140a6c94 | 1001 | int __pm_runtime_idle(struct device *dev, int rpmflags) |
5e928f77 RW |
1002 | { |
1003 | unsigned long flags; | |
1004 | int retval; | |
1005 | ||
140a6c94 AS |
1006 | if (rpmflags & RPM_GET_PUT) { |
1007 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
1008 | return 0; | |
1009 | } | |
1010 | ||
a9306a63 RW |
1011 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
1012 | ||
5e928f77 | 1013 | spin_lock_irqsave(&dev->power.lock, flags); |
140a6c94 | 1014 | retval = rpm_idle(dev, rpmflags); |
5e928f77 RW |
1015 | spin_unlock_irqrestore(&dev->power.lock, flags); |
1016 | ||
1017 | return retval; | |
1018 | } | |
140a6c94 | 1019 | EXPORT_SYMBOL_GPL(__pm_runtime_idle); |
5e928f77 RW |
1020 | |
1021 | /** | |
62052ab1 | 1022 | * __pm_runtime_suspend - Entry point for runtime put/suspend operations. |
140a6c94 | 1023 | * @dev: Device to suspend. |
3f9af051 | 1024 | * @rpmflags: Flag bits. |
5e928f77 | 1025 | * |
15bcb91d AS |
1026 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and |
1027 | * return immediately if it is larger than zero. Then carry out a suspend, | |
1028 | * either synchronous or asynchronous. | |
140a6c94 | 1029 | * |
311aab73 CC |
1030 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
1031 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 1032 | */ |
140a6c94 | 1033 | int __pm_runtime_suspend(struct device *dev, int rpmflags) |
5e928f77 | 1034 | { |
140a6c94 | 1035 | unsigned long flags; |
1d531c14 | 1036 | int retval; |
5e928f77 | 1037 | |
15bcb91d AS |
1038 | if (rpmflags & RPM_GET_PUT) { |
1039 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
1040 | return 0; | |
1041 | } | |
1042 | ||
a9306a63 RW |
1043 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
1044 | ||
140a6c94 AS |
1045 | spin_lock_irqsave(&dev->power.lock, flags); |
1046 | retval = rpm_suspend(dev, rpmflags); | |
1047 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
1048 | |
1049 | return retval; | |
1050 | } | |
140a6c94 | 1051 | EXPORT_SYMBOL_GPL(__pm_runtime_suspend); |
5e928f77 RW |
1052 | |
1053 | /** | |
62052ab1 | 1054 | * __pm_runtime_resume - Entry point for runtime resume operations. |
140a6c94 | 1055 | * @dev: Device to resume. |
3f9af051 | 1056 | * @rpmflags: Flag bits. |
5e928f77 | 1057 | * |
140a6c94 AS |
1058 | * If the RPM_GET_PUT flag is set, increment the device's usage count. Then |
1059 | * carry out a resume, either synchronous or asynchronous. | |
1060 | * | |
311aab73 CC |
1061 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
1062 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 1063 | */ |
140a6c94 | 1064 | int __pm_runtime_resume(struct device *dev, int rpmflags) |
5e928f77 | 1065 | { |
140a6c94 AS |
1066 | unsigned long flags; |
1067 | int retval; | |
5e928f77 | 1068 | |
a9306a63 RW |
1069 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe && |
1070 | dev->power.runtime_status != RPM_ACTIVE); | |
311aab73 | 1071 | |
140a6c94 AS |
1072 | if (rpmflags & RPM_GET_PUT) |
1073 | atomic_inc(&dev->power.usage_count); | |
1074 | ||
1075 | spin_lock_irqsave(&dev->power.lock, flags); | |
1076 | retval = rpm_resume(dev, rpmflags); | |
1077 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
1078 | |
1079 | return retval; | |
1080 | } | |
140a6c94 | 1081 | EXPORT_SYMBOL_GPL(__pm_runtime_resume); |
5e928f77 | 1082 | |
a436b6a1 RW |
1083 | /** |
1084 | * pm_runtime_get_if_in_use - Conditionally bump up the device's usage counter. | |
1085 | * @dev: Device to handle. | |
1086 | * | |
1087 | * Return -EINVAL if runtime PM is disabled for the device. | |
1088 | * | |
1089 | * If that's not the case and if the device's runtime PM status is RPM_ACTIVE | |
1090 | * and the runtime PM usage counter is nonzero, increment the counter and | |
1091 | * return 1. Otherwise return 0 without changing the counter. | |
1092 | */ | |
1093 | int pm_runtime_get_if_in_use(struct device *dev) | |
1094 | { | |
1095 | unsigned long flags; | |
1096 | int retval; | |
1097 | ||
1098 | spin_lock_irqsave(&dev->power.lock, flags); | |
1099 | retval = dev->power.disable_depth > 0 ? -EINVAL : | |
1100 | dev->power.runtime_status == RPM_ACTIVE | |
1101 | && atomic_inc_not_zero(&dev->power.usage_count); | |
1102 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1103 | return retval; | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(pm_runtime_get_if_in_use); | |
1106 | ||
5e928f77 | 1107 | /** |
62052ab1 | 1108 | * __pm_runtime_set_status - Set runtime PM status of a device. |
5e928f77 | 1109 | * @dev: Device to handle. |
62052ab1 | 1110 | * @status: New runtime PM status of the device. |
5e928f77 | 1111 | * |
62052ab1 | 1112 | * If runtime PM of the device is disabled or its power.runtime_error field is |
5e928f77 RW |
1113 | * different from zero, the status may be changed either to RPM_ACTIVE, or to |
1114 | * RPM_SUSPENDED, as long as that reflects the actual state of the device. | |
1115 | * However, if the device has a parent and the parent is not active, and the | |
1116 | * parent's power.ignore_children flag is unset, the device's status cannot be | |
1117 | * set to RPM_ACTIVE, so -EBUSY is returned in that case. | |
1118 | * | |
1119 | * If successful, __pm_runtime_set_status() clears the power.runtime_error field | |
1120 | * and the device parent's counter of unsuspended children is modified to | |
1121 | * reflect the new status. If the new status is RPM_SUSPENDED, an idle | |
1122 | * notification request for the parent is submitted. | |
4080ab08 RW |
1123 | * |
1124 | * If @dev has any suppliers (as reflected by device links to them), and @status | |
1125 | * is RPM_ACTIVE, they will be activated upfront and if the activation of one | |
1126 | * of them fails, the status of @dev will be changed to RPM_SUSPENDED (instead | |
1127 | * of the @status value) and the suppliers will be deacticated on exit. The | |
1128 | * error returned by the failing supplier activation will be returned in that | |
1129 | * case. | |
5e928f77 RW |
1130 | */ |
1131 | int __pm_runtime_set_status(struct device *dev, unsigned int status) | |
1132 | { | |
1133 | struct device *parent = dev->parent; | |
5e928f77 RW |
1134 | bool notify_parent = false; |
1135 | int error = 0; | |
1136 | ||
1137 | if (status != RPM_ACTIVE && status != RPM_SUSPENDED) | |
1138 | return -EINVAL; | |
1139 | ||
c1567f81 | 1140 | spin_lock_irq(&dev->power.lock); |
5e928f77 | 1141 | |
c1567f81 RW |
1142 | /* |
1143 | * Prevent PM-runtime from being enabled for the device or return an | |
1144 | * error if it is enabled already and working. | |
1145 | */ | |
1146 | if (dev->power.runtime_error || dev->power.disable_depth) | |
1147 | dev->power.disable_depth++; | |
1148 | else | |
5e928f77 | 1149 | error = -EAGAIN; |
c1567f81 RW |
1150 | |
1151 | spin_unlock_irq(&dev->power.lock); | |
1152 | ||
1153 | if (error) | |
1154 | return error; | |
1155 | ||
4080ab08 RW |
1156 | /* |
1157 | * If the new status is RPM_ACTIVE, the suppliers can be activated | |
1158 | * upfront regardless of the current status, because next time | |
1159 | * rpm_put_suppliers() runs, the rpm_active refcounts of the links | |
1160 | * involved will be dropped down to one anyway. | |
1161 | */ | |
1162 | if (status == RPM_ACTIVE) { | |
1163 | int idx = device_links_read_lock(); | |
1164 | ||
1165 | error = rpm_get_suppliers(dev); | |
1166 | if (error) | |
1167 | status = RPM_SUSPENDED; | |
1168 | ||
1169 | device_links_read_unlock(idx); | |
5e928f77 RW |
1170 | } |
1171 | ||
4080ab08 | 1172 | spin_lock_irq(&dev->power.lock); |
5e928f77 | 1173 | |
f8817f61 | 1174 | if (dev->power.runtime_status == status || !parent) |
5e928f77 RW |
1175 | goto out_set; |
1176 | ||
1177 | if (status == RPM_SUSPENDED) { | |
f8817f61 RW |
1178 | atomic_add_unless(&parent->power.child_count, -1, 0); |
1179 | notify_parent = !parent->power.ignore_children; | |
1180 | } else { | |
bab636b9 | 1181 | spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING); |
5e928f77 RW |
1182 | |
1183 | /* | |
1184 | * It is invalid to put an active child under a parent that is | |
62052ab1 | 1185 | * not active, has runtime PM enabled and the |
5e928f77 RW |
1186 | * 'power.ignore_children' flag unset. |
1187 | */ | |
1188 | if (!parent->power.disable_depth | |
1189 | && !parent->power.ignore_children | |
71723f95 LW |
1190 | && parent->power.runtime_status != RPM_ACTIVE) { |
1191 | dev_err(dev, "runtime PM trying to activate child device %s but parent (%s) is not active\n", | |
1192 | dev_name(dev), | |
1193 | dev_name(parent)); | |
5e928f77 | 1194 | error = -EBUSY; |
71723f95 | 1195 | } else if (dev->power.runtime_status == RPM_SUSPENDED) { |
965c4ac0 | 1196 | atomic_inc(&parent->power.child_count); |
71723f95 | 1197 | } |
5e928f77 | 1198 | |
862f89b3 | 1199 | spin_unlock(&parent->power.lock); |
5e928f77 | 1200 | |
4080ab08 RW |
1201 | if (error) { |
1202 | status = RPM_SUSPENDED; | |
5e928f77 | 1203 | goto out; |
4080ab08 | 1204 | } |
5e928f77 RW |
1205 | } |
1206 | ||
1207 | out_set: | |
8d4b9d1b | 1208 | __update_runtime_status(dev, status); |
4080ab08 RW |
1209 | if (!error) |
1210 | dev->power.runtime_error = 0; | |
1211 | ||
5e928f77 | 1212 | out: |
4080ab08 | 1213 | spin_unlock_irq(&dev->power.lock); |
5e928f77 RW |
1214 | |
1215 | if (notify_parent) | |
1216 | pm_request_idle(parent); | |
1217 | ||
4080ab08 RW |
1218 | if (status == RPM_SUSPENDED) { |
1219 | int idx = device_links_read_lock(); | |
1220 | ||
1221 | rpm_put_suppliers(dev); | |
1222 | ||
1223 | device_links_read_unlock(idx); | |
1224 | } | |
1225 | ||
c1567f81 RW |
1226 | pm_runtime_enable(dev); |
1227 | ||
5e928f77 RW |
1228 | return error; |
1229 | } | |
1230 | EXPORT_SYMBOL_GPL(__pm_runtime_set_status); | |
1231 | ||
1232 | /** | |
1233 | * __pm_runtime_barrier - Cancel pending requests and wait for completions. | |
1234 | * @dev: Device to handle. | |
1235 | * | |
1236 | * Flush all pending requests for the device from pm_wq and wait for all | |
62052ab1 | 1237 | * runtime PM operations involving the device in progress to complete. |
5e928f77 RW |
1238 | * |
1239 | * Should be called under dev->power.lock with interrupts disabled. | |
1240 | */ | |
1241 | static void __pm_runtime_barrier(struct device *dev) | |
1242 | { | |
1243 | pm_runtime_deactivate_timer(dev); | |
1244 | ||
1245 | if (dev->power.request_pending) { | |
1246 | dev->power.request = RPM_REQ_NONE; | |
1247 | spin_unlock_irq(&dev->power.lock); | |
1248 | ||
1249 | cancel_work_sync(&dev->power.work); | |
1250 | ||
1251 | spin_lock_irq(&dev->power.lock); | |
1252 | dev->power.request_pending = false; | |
1253 | } | |
1254 | ||
1255 | if (dev->power.runtime_status == RPM_SUSPENDING | |
1256 | || dev->power.runtime_status == RPM_RESUMING | |
1257 | || dev->power.idle_notification) { | |
1258 | DEFINE_WAIT(wait); | |
1259 | ||
1260 | /* Suspend, wake-up or idle notification in progress. */ | |
1261 | for (;;) { | |
1262 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
1263 | TASK_UNINTERRUPTIBLE); | |
1264 | if (dev->power.runtime_status != RPM_SUSPENDING | |
1265 | && dev->power.runtime_status != RPM_RESUMING | |
1266 | && !dev->power.idle_notification) | |
1267 | break; | |
1268 | spin_unlock_irq(&dev->power.lock); | |
1269 | ||
1270 | schedule(); | |
1271 | ||
1272 | spin_lock_irq(&dev->power.lock); | |
1273 | } | |
1274 | finish_wait(&dev->power.wait_queue, &wait); | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | /** | |
1279 | * pm_runtime_barrier - Flush pending requests and wait for completions. | |
1280 | * @dev: Device to handle. | |
1281 | * | |
1282 | * Prevent the device from being suspended by incrementing its usage counter and | |
1283 | * if there's a pending resume request for the device, wake the device up. | |
1284 | * Next, make sure that all pending requests for the device have been flushed | |
62052ab1 | 1285 | * from pm_wq and wait for all runtime PM operations involving the device in |
5e928f77 RW |
1286 | * progress to complete. |
1287 | * | |
1288 | * Return value: | |
1289 | * 1, if there was a resume request pending and the device had to be woken up, | |
1290 | * 0, otherwise | |
1291 | */ | |
1292 | int pm_runtime_barrier(struct device *dev) | |
1293 | { | |
1294 | int retval = 0; | |
1295 | ||
1296 | pm_runtime_get_noresume(dev); | |
1297 | spin_lock_irq(&dev->power.lock); | |
1298 | ||
1299 | if (dev->power.request_pending | |
1300 | && dev->power.request == RPM_REQ_RESUME) { | |
140a6c94 | 1301 | rpm_resume(dev, 0); |
5e928f77 RW |
1302 | retval = 1; |
1303 | } | |
1304 | ||
1305 | __pm_runtime_barrier(dev); | |
1306 | ||
1307 | spin_unlock_irq(&dev->power.lock); | |
1308 | pm_runtime_put_noidle(dev); | |
1309 | ||
1310 | return retval; | |
1311 | } | |
1312 | EXPORT_SYMBOL_GPL(pm_runtime_barrier); | |
1313 | ||
1314 | /** | |
62052ab1 | 1315 | * __pm_runtime_disable - Disable runtime PM of a device. |
5e928f77 RW |
1316 | * @dev: Device to handle. |
1317 | * @check_resume: If set, check if there's a resume request for the device. | |
1318 | * | |
7b60894f | 1319 | * Increment power.disable_depth for the device and if it was zero previously, |
62052ab1 | 1320 | * cancel all pending runtime PM requests for the device and wait for all |
5e928f77 | 1321 | * operations in progress to complete. The device can be either active or |
62052ab1 | 1322 | * suspended after its runtime PM has been disabled. |
5e928f77 RW |
1323 | * |
1324 | * If @check_resume is set and there's a resume request pending when | |
1325 | * __pm_runtime_disable() is called and power.disable_depth is zero, the | |
62052ab1 | 1326 | * function will wake up the device before disabling its runtime PM. |
5e928f77 RW |
1327 | */ |
1328 | void __pm_runtime_disable(struct device *dev, bool check_resume) | |
1329 | { | |
1330 | spin_lock_irq(&dev->power.lock); | |
1331 | ||
1332 | if (dev->power.disable_depth > 0) { | |
1333 | dev->power.disable_depth++; | |
1334 | goto out; | |
1335 | } | |
1336 | ||
1337 | /* | |
1338 | * Wake up the device if there's a resume request pending, because that | |
62052ab1 | 1339 | * means there probably is some I/O to process and disabling runtime PM |
5e928f77 RW |
1340 | * shouldn't prevent the device from processing the I/O. |
1341 | */ | |
1342 | if (check_resume && dev->power.request_pending | |
1343 | && dev->power.request == RPM_REQ_RESUME) { | |
1344 | /* | |
1345 | * Prevent suspends and idle notifications from being carried | |
1346 | * out after we have woken up the device. | |
1347 | */ | |
1348 | pm_runtime_get_noresume(dev); | |
1349 | ||
140a6c94 | 1350 | rpm_resume(dev, 0); |
5e928f77 RW |
1351 | |
1352 | pm_runtime_put_noidle(dev); | |
1353 | } | |
1354 | ||
fed7e88c VG |
1355 | /* Update time accounting before disabling PM-runtime. */ |
1356 | update_pm_runtime_accounting(dev); | |
1357 | ||
5e928f77 RW |
1358 | if (!dev->power.disable_depth++) |
1359 | __pm_runtime_barrier(dev); | |
1360 | ||
1361 | out: | |
1362 | spin_unlock_irq(&dev->power.lock); | |
1363 | } | |
1364 | EXPORT_SYMBOL_GPL(__pm_runtime_disable); | |
1365 | ||
1366 | /** | |
62052ab1 | 1367 | * pm_runtime_enable - Enable runtime PM of a device. |
5e928f77 RW |
1368 | * @dev: Device to handle. |
1369 | */ | |
1370 | void pm_runtime_enable(struct device *dev) | |
1371 | { | |
1372 | unsigned long flags; | |
1373 | ||
1374 | spin_lock_irqsave(&dev->power.lock, flags); | |
1375 | ||
58456488 | 1376 | if (dev->power.disable_depth > 0) { |
5e928f77 | 1377 | dev->power.disable_depth--; |
58456488 VG |
1378 | |
1379 | /* About to enable runtime pm, set accounting_timestamp to now */ | |
1380 | if (!dev->power.disable_depth) | |
c155f649 | 1381 | dev->power.accounting_timestamp = ktime_get_mono_fast_ns(); |
58456488 | 1382 | } else { |
5e928f77 | 1383 | dev_warn(dev, "Unbalanced %s!\n", __func__); |
58456488 | 1384 | } |
5e928f77 | 1385 | |
f8817f61 RW |
1386 | WARN(!dev->power.disable_depth && |
1387 | dev->power.runtime_status == RPM_SUSPENDED && | |
1388 | !dev->power.ignore_children && | |
1389 | atomic_read(&dev->power.child_count) > 0, | |
1390 | "Enabling runtime PM for inactive device (%s) with active children\n", | |
1391 | dev_name(dev)); | |
1392 | ||
5e928f77 RW |
1393 | spin_unlock_irqrestore(&dev->power.lock, flags); |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(pm_runtime_enable); | |
1396 | ||
53823639 | 1397 | /** |
62052ab1 | 1398 | * pm_runtime_forbid - Block runtime PM of a device. |
53823639 RW |
1399 | * @dev: Device to handle. |
1400 | * | |
1401 | * Increase the device's usage count and clear its power.runtime_auto flag, | |
1402 | * so that it cannot be suspended at run time until pm_runtime_allow() is called | |
1403 | * for it. | |
1404 | */ | |
1405 | void pm_runtime_forbid(struct device *dev) | |
1406 | { | |
1407 | spin_lock_irq(&dev->power.lock); | |
1408 | if (!dev->power.runtime_auto) | |
1409 | goto out; | |
1410 | ||
1411 | dev->power.runtime_auto = false; | |
1412 | atomic_inc(&dev->power.usage_count); | |
140a6c94 | 1413 | rpm_resume(dev, 0); |
53823639 RW |
1414 | |
1415 | out: | |
1416 | spin_unlock_irq(&dev->power.lock); | |
1417 | } | |
1418 | EXPORT_SYMBOL_GPL(pm_runtime_forbid); | |
1419 | ||
1420 | /** | |
62052ab1 | 1421 | * pm_runtime_allow - Unblock runtime PM of a device. |
53823639 RW |
1422 | * @dev: Device to handle. |
1423 | * | |
1424 | * Decrease the device's usage count and set its power.runtime_auto flag. | |
1425 | */ | |
1426 | void pm_runtime_allow(struct device *dev) | |
1427 | { | |
1428 | spin_lock_irq(&dev->power.lock); | |
1429 | if (dev->power.runtime_auto) | |
1430 | goto out; | |
1431 | ||
1432 | dev->power.runtime_auto = true; | |
1433 | if (atomic_dec_and_test(&dev->power.usage_count)) | |
fe7450b0 | 1434 | rpm_idle(dev, RPM_AUTO | RPM_ASYNC); |
53823639 RW |
1435 | |
1436 | out: | |
1437 | spin_unlock_irq(&dev->power.lock); | |
1438 | } | |
1439 | EXPORT_SYMBOL_GPL(pm_runtime_allow); | |
1440 | ||
7490e442 | 1441 | /** |
62052ab1 | 1442 | * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device. |
7490e442 AS |
1443 | * @dev: Device to handle. |
1444 | * | |
1445 | * Set the power.no_callbacks flag, which tells the PM core that this | |
62052ab1 RW |
1446 | * device is power-managed through its parent and has no runtime PM |
1447 | * callbacks of its own. The runtime sysfs attributes will be removed. | |
7490e442 AS |
1448 | */ |
1449 | void pm_runtime_no_callbacks(struct device *dev) | |
1450 | { | |
1451 | spin_lock_irq(&dev->power.lock); | |
1452 | dev->power.no_callbacks = 1; | |
1453 | spin_unlock_irq(&dev->power.lock); | |
1454 | if (device_is_registered(dev)) | |
1455 | rpm_sysfs_remove(dev); | |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); | |
1458 | ||
c7b61de5 AS |
1459 | /** |
1460 | * pm_runtime_irq_safe - Leave interrupts disabled during callbacks. | |
1461 | * @dev: Device to handle | |
1462 | * | |
1463 | * Set the power.irq_safe flag, which tells the PM core that the | |
1464 | * ->runtime_suspend() and ->runtime_resume() callbacks for this device should | |
1465 | * always be invoked with the spinlock held and interrupts disabled. It also | |
1466 | * causes the parent's usage counter to be permanently incremented, preventing | |
1467 | * the parent from runtime suspending -- otherwise an irq-safe child might have | |
1468 | * to wait for a non-irq-safe parent. | |
1469 | */ | |
1470 | void pm_runtime_irq_safe(struct device *dev) | |
1471 | { | |
1472 | if (dev->parent) | |
1473 | pm_runtime_get_sync(dev->parent); | |
1474 | spin_lock_irq(&dev->power.lock); | |
1475 | dev->power.irq_safe = 1; | |
1476 | spin_unlock_irq(&dev->power.lock); | |
1477 | } | |
1478 | EXPORT_SYMBOL_GPL(pm_runtime_irq_safe); | |
1479 | ||
15bcb91d AS |
1480 | /** |
1481 | * update_autosuspend - Handle a change to a device's autosuspend settings. | |
1482 | * @dev: Device to handle. | |
1483 | * @old_delay: The former autosuspend_delay value. | |
1484 | * @old_use: The former use_autosuspend value. | |
1485 | * | |
1486 | * Prevent runtime suspend if the new delay is negative and use_autosuspend is | |
1487 | * set; otherwise allow it. Send an idle notification if suspends are allowed. | |
1488 | * | |
1489 | * This function must be called under dev->power.lock with interrupts disabled. | |
1490 | */ | |
1491 | static void update_autosuspend(struct device *dev, int old_delay, int old_use) | |
1492 | { | |
1493 | int delay = dev->power.autosuspend_delay; | |
1494 | ||
1495 | /* Should runtime suspend be prevented now? */ | |
1496 | if (dev->power.use_autosuspend && delay < 0) { | |
1497 | ||
1498 | /* If it used to be allowed then prevent it. */ | |
1499 | if (!old_use || old_delay >= 0) { | |
1500 | atomic_inc(&dev->power.usage_count); | |
1501 | rpm_resume(dev, 0); | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | /* Runtime suspend should be allowed now. */ | |
1506 | else { | |
1507 | ||
1508 | /* If it used to be prevented then allow it. */ | |
1509 | if (old_use && old_delay < 0) | |
1510 | atomic_dec(&dev->power.usage_count); | |
1511 | ||
1512 | /* Maybe we can autosuspend now. */ | |
1513 | rpm_idle(dev, RPM_AUTO); | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | /** | |
1518 | * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. | |
1519 | * @dev: Device to handle. | |
1520 | * @delay: Value of the new delay in milliseconds. | |
1521 | * | |
1522 | * Set the device's power.autosuspend_delay value. If it changes to negative | |
62052ab1 RW |
1523 | * and the power.use_autosuspend flag is set, prevent runtime suspends. If it |
1524 | * changes the other way, allow runtime suspends. | |
15bcb91d AS |
1525 | */ |
1526 | void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) | |
1527 | { | |
1528 | int old_delay, old_use; | |
1529 | ||
1530 | spin_lock_irq(&dev->power.lock); | |
1531 | old_delay = dev->power.autosuspend_delay; | |
1532 | old_use = dev->power.use_autosuspend; | |
1533 | dev->power.autosuspend_delay = delay; | |
1534 | update_autosuspend(dev, old_delay, old_use); | |
1535 | spin_unlock_irq(&dev->power.lock); | |
1536 | } | |
1537 | EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); | |
1538 | ||
1539 | /** | |
1540 | * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. | |
1541 | * @dev: Device to handle. | |
1542 | * @use: New value for use_autosuspend. | |
1543 | * | |
62052ab1 | 1544 | * Set the device's power.use_autosuspend flag, and allow or prevent runtime |
15bcb91d AS |
1545 | * suspends as needed. |
1546 | */ | |
1547 | void __pm_runtime_use_autosuspend(struct device *dev, bool use) | |
1548 | { | |
1549 | int old_delay, old_use; | |
1550 | ||
1551 | spin_lock_irq(&dev->power.lock); | |
1552 | old_delay = dev->power.autosuspend_delay; | |
1553 | old_use = dev->power.use_autosuspend; | |
1554 | dev->power.use_autosuspend = use; | |
1555 | update_autosuspend(dev, old_delay, old_use); | |
1556 | spin_unlock_irq(&dev->power.lock); | |
1557 | } | |
1558 | EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); | |
1559 | ||
5e928f77 | 1560 | /** |
62052ab1 | 1561 | * pm_runtime_init - Initialize runtime PM fields in given device object. |
5e928f77 RW |
1562 | * @dev: Device object to initialize. |
1563 | */ | |
1564 | void pm_runtime_init(struct device *dev) | |
1565 | { | |
5e928f77 RW |
1566 | dev->power.runtime_status = RPM_SUSPENDED; |
1567 | dev->power.idle_notification = false; | |
1568 | ||
1569 | dev->power.disable_depth = 1; | |
1570 | atomic_set(&dev->power.usage_count, 0); | |
1571 | ||
1572 | dev->power.runtime_error = 0; | |
1573 | ||
1574 | atomic_set(&dev->power.child_count, 0); | |
1575 | pm_suspend_ignore_children(dev, false); | |
53823639 | 1576 | dev->power.runtime_auto = true; |
5e928f77 RW |
1577 | |
1578 | dev->power.request_pending = false; | |
1579 | dev->power.request = RPM_REQ_NONE; | |
1580 | dev->power.deferred_resume = false; | |
1581 | INIT_WORK(&dev->power.work, pm_runtime_work); | |
1582 | ||
1583 | dev->power.timer_expires = 0; | |
8234f673 VG |
1584 | hrtimer_init(&dev->power.suspend_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1585 | dev->power.suspend_timer.function = pm_suspend_timer_fn; | |
5e928f77 RW |
1586 | |
1587 | init_waitqueue_head(&dev->power.wait_queue); | |
1588 | } | |
1589 | ||
5de85b9d UH |
1590 | /** |
1591 | * pm_runtime_reinit - Re-initialize runtime PM fields in given device object. | |
1592 | * @dev: Device object to re-initialize. | |
1593 | */ | |
1594 | void pm_runtime_reinit(struct device *dev) | |
1595 | { | |
1596 | if (!pm_runtime_enabled(dev)) { | |
1597 | if (dev->power.runtime_status == RPM_ACTIVE) | |
1598 | pm_runtime_set_suspended(dev); | |
1599 | if (dev->power.irq_safe) { | |
1600 | spin_lock_irq(&dev->power.lock); | |
1601 | dev->power.irq_safe = 0; | |
1602 | spin_unlock_irq(&dev->power.lock); | |
1603 | if (dev->parent) | |
1604 | pm_runtime_put(dev->parent); | |
1605 | } | |
1606 | } | |
1607 | } | |
1608 | ||
5e928f77 RW |
1609 | /** |
1610 | * pm_runtime_remove - Prepare for removing a device from device hierarchy. | |
1611 | * @dev: Device object being removed from device hierarchy. | |
1612 | */ | |
1613 | void pm_runtime_remove(struct device *dev) | |
1614 | { | |
1615 | __pm_runtime_disable(dev, false); | |
5de85b9d | 1616 | pm_runtime_reinit(dev); |
5e928f77 | 1617 | } |
37f20416 | 1618 | |
21d5c57b RW |
1619 | /** |
1620 | * pm_runtime_clean_up_links - Prepare links to consumers for driver removal. | |
1621 | * @dev: Device whose driver is going to be removed. | |
1622 | * | |
1623 | * Check links from this device to any consumers and if any of them have active | |
1624 | * runtime PM references to the device, drop the usage counter of the device | |
e2f3cd83 | 1625 | * (as many times as needed). |
21d5c57b RW |
1626 | * |
1627 | * Links with the DL_FLAG_STATELESS flag set are ignored. | |
1628 | * | |
1629 | * Since the device is guaranteed to be runtime-active at the point this is | |
1630 | * called, nothing else needs to be done here. | |
1631 | * | |
1632 | * Moreover, this is called after device_links_busy() has returned 'false', so | |
1633 | * the status of each link is guaranteed to be DL_STATE_SUPPLIER_UNBIND and | |
1634 | * therefore rpm_active can't be manipulated concurrently. | |
1635 | */ | |
1636 | void pm_runtime_clean_up_links(struct device *dev) | |
1637 | { | |
1638 | struct device_link *link; | |
1639 | int idx; | |
1640 | ||
1641 | idx = device_links_read_lock(); | |
1642 | ||
1643 | list_for_each_entry_rcu(link, &dev->links.consumers, s_node) { | |
1644 | if (link->flags & DL_FLAG_STATELESS) | |
1645 | continue; | |
1646 | ||
e2f3cd83 | 1647 | while (refcount_dec_not_one(&link->rpm_active)) |
21d5c57b | 1648 | pm_runtime_put_noidle(dev); |
21d5c57b RW |
1649 | } |
1650 | ||
1651 | device_links_read_unlock(idx); | |
1652 | } | |
1653 | ||
1654 | /** | |
b06c0b2f | 1655 | * pm_runtime_get_suppliers - Resume and reference-count supplier devices. |
21d5c57b RW |
1656 | * @dev: Consumer device. |
1657 | */ | |
b06c0b2f | 1658 | void pm_runtime_get_suppliers(struct device *dev) |
21d5c57b | 1659 | { |
b06c0b2f | 1660 | struct device_link *link; |
21d5c57b RW |
1661 | int idx; |
1662 | ||
1663 | idx = device_links_read_lock(); | |
1664 | ||
b06c0b2f | 1665 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) |
4c06c4e6 | 1666 | if (link->flags & DL_FLAG_PM_RUNTIME) { |
36003d4c | 1667 | link->supplier_preactivated = true; |
4c06c4e6 | 1668 | refcount_inc(&link->rpm_active); |
b06c0b2f | 1669 | pm_runtime_get_sync(link->supplier); |
4c06c4e6 | 1670 | } |
b06c0b2f RW |
1671 | |
1672 | device_links_read_unlock(idx); | |
1673 | } | |
1674 | ||
1675 | /** | |
1676 | * pm_runtime_put_suppliers - Drop references to supplier devices. | |
1677 | * @dev: Consumer device. | |
1678 | */ | |
1679 | void pm_runtime_put_suppliers(struct device *dev) | |
1680 | { | |
1681 | struct device_link *link; | |
1682 | int idx; | |
1683 | ||
1684 | idx = device_links_read_lock(); | |
1685 | ||
1686 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) | |
36003d4c RW |
1687 | if (link->supplier_preactivated) { |
1688 | link->supplier_preactivated = false; | |
1689 | if (refcount_dec_not_one(&link->rpm_active)) | |
1690 | pm_runtime_put(link->supplier); | |
1691 | } | |
21d5c57b RW |
1692 | |
1693 | device_links_read_unlock(idx); | |
1694 | } | |
1695 | ||
baa8809f RW |
1696 | void pm_runtime_new_link(struct device *dev) |
1697 | { | |
1698 | spin_lock_irq(&dev->power.lock); | |
1699 | dev->power.links_count++; | |
1700 | spin_unlock_irq(&dev->power.lock); | |
1701 | } | |
1702 | ||
1703 | void pm_runtime_drop_link(struct device *dev) | |
1704 | { | |
1705 | spin_lock_irq(&dev->power.lock); | |
1706 | WARN_ON(dev->power.links_count == 0); | |
1707 | dev->power.links_count--; | |
1708 | spin_unlock_irq(&dev->power.lock); | |
1709 | } | |
1710 | ||
4918e1f8 RW |
1711 | static bool pm_runtime_need_not_resume(struct device *dev) |
1712 | { | |
1713 | return atomic_read(&dev->power.usage_count) <= 1 && | |
1f5c6855 RW |
1714 | (atomic_read(&dev->power.child_count) == 0 || |
1715 | dev->power.ignore_children); | |
4918e1f8 RW |
1716 | } |
1717 | ||
37f20416 UH |
1718 | /** |
1719 | * pm_runtime_force_suspend - Force a device into suspend state if needed. | |
1720 | * @dev: Device to suspend. | |
1721 | * | |
1722 | * Disable runtime PM so we safely can check the device's runtime PM status and | |
4918e1f8 RW |
1723 | * if it is active, invoke its ->runtime_suspend callback to suspend it and |
1724 | * change its runtime PM status field to RPM_SUSPENDED. Also, if the device's | |
1725 | * usage and children counters don't indicate that the device was in use before | |
1726 | * the system-wide transition under way, decrement its parent's children counter | |
1727 | * (if there is a parent). Keep runtime PM disabled to preserve the state | |
1728 | * unless we encounter errors. | |
37f20416 UH |
1729 | * |
1730 | * Typically this function may be invoked from a system suspend callback to make | |
4918e1f8 RW |
1731 | * sure the device is put into low power state and it should only be used during |
1732 | * system-wide PM transitions to sleep states. It assumes that the analogous | |
1733 | * pm_runtime_force_resume() will be used to resume the device. | |
37f20416 UH |
1734 | */ |
1735 | int pm_runtime_force_suspend(struct device *dev) | |
1736 | { | |
1737 | int (*callback)(struct device *); | |
617fcb67 | 1738 | int ret; |
37f20416 UH |
1739 | |
1740 | pm_runtime_disable(dev); | |
37f20416 UH |
1741 | if (pm_runtime_status_suspended(dev)) |
1742 | return 0; | |
1743 | ||
dbcd2d72 | 1744 | callback = RPM_GET_CALLBACK(dev, runtime_suspend); |
37f20416 | 1745 | |
617fcb67 | 1746 | ret = callback ? callback(dev) : 0; |
37f20416 UH |
1747 | if (ret) |
1748 | goto err; | |
1749 | ||
1d9174fb | 1750 | /* |
4918e1f8 RW |
1751 | * If the device can stay in suspend after the system-wide transition |
1752 | * to the working state that will follow, drop the children counter of | |
1753 | * its parent, but set its status to RPM_SUSPENDED anyway in case this | |
1754 | * function will be called again for it in the meantime. | |
1d9174fb | 1755 | */ |
4918e1f8 RW |
1756 | if (pm_runtime_need_not_resume(dev)) |
1757 | pm_runtime_set_suspended(dev); | |
1758 | else | |
1759 | __update_runtime_status(dev, RPM_SUSPENDED); | |
1d9174fb | 1760 | |
37f20416 | 1761 | return 0; |
4918e1f8 | 1762 | |
37f20416 UH |
1763 | err: |
1764 | pm_runtime_enable(dev); | |
1765 | return ret; | |
1766 | } | |
1767 | EXPORT_SYMBOL_GPL(pm_runtime_force_suspend); | |
1768 | ||
1769 | /** | |
1d9174fb | 1770 | * pm_runtime_force_resume - Force a device into resume state if needed. |
37f20416 UH |
1771 | * @dev: Device to resume. |
1772 | * | |
1773 | * Prior invoking this function we expect the user to have brought the device | |
1774 | * into low power state by a call to pm_runtime_force_suspend(). Here we reverse | |
4918e1f8 RW |
1775 | * those actions and bring the device into full power, if it is expected to be |
1776 | * used on system resume. In the other case, we defer the resume to be managed | |
1777 | * via runtime PM. | |
37f20416 | 1778 | * |
1d9174fb | 1779 | * Typically this function may be invoked from a system resume callback. |
37f20416 UH |
1780 | */ |
1781 | int pm_runtime_force_resume(struct device *dev) | |
1782 | { | |
1783 | int (*callback)(struct device *); | |
1784 | int ret = 0; | |
1785 | ||
4918e1f8 | 1786 | if (!pm_runtime_status_suspended(dev) || pm_runtime_need_not_resume(dev)) |
9f5b5274 UH |
1787 | goto out; |
1788 | ||
1d9174fb | 1789 | /* |
4918e1f8 RW |
1790 | * The value of the parent's children counter is correct already, so |
1791 | * just update the status of the device. | |
1792 | */ | |
1793 | __update_runtime_status(dev, RPM_ACTIVE); | |
1d9174fb | 1794 | |
4918e1f8 | 1795 | callback = RPM_GET_CALLBACK(dev, runtime_resume); |
37f20416 | 1796 | |
617fcb67 | 1797 | ret = callback ? callback(dev) : 0; |
0ae3aeef UH |
1798 | if (ret) { |
1799 | pm_runtime_set_suspended(dev); | |
1800 | goto out; | |
1801 | } | |
1802 | ||
37f20416 UH |
1803 | pm_runtime_mark_last_busy(dev); |
1804 | out: | |
1805 | pm_runtime_enable(dev); | |
1806 | return ret; | |
1807 | } | |
1808 | EXPORT_SYMBOL_GPL(pm_runtime_force_resume); |