drivers/base/power/main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * drivers/base/power/main.c - Where the driver meets power management.
   4  *
   5  * Copyright (c) 2003 Patrick Mochel
   6  * Copyright (c) 2003 Open Source Development Lab
   7  *
   8  * The driver model core calls device_pm_add() when a device is registered.
   9  * This will initialize the embedded device_pm_info object in the device
  10  * and add it to the list of power-controlled devices. sysfs entries for
  11  * controlling device power management will also be added.
  12  *
  13  * A separate list is used for keeping track of power info, because the power
  14  * domain dependencies may differ from the ancestral dependencies that the
  15  * subsystem list maintains.
  16  */
  17
  18 #define pr_fmt(fmt) "PM: " fmt
  19
  20 #include <linux/device.h>
  21 #include <linux/export.h>
  22 #include <linux/mutex.h>
  23 #include <linux/pm.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/pm-trace.h>
  26 #include <linux/pm_wakeirq.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/sched.h>
  29 #include <linux/sched/debug.h>
  30 #include <linux/async.h>
  31 #include <linux/suspend.h>
  32 #include <trace/events/power.h>
  33 #include <linux/cpufreq.h>
  34 #include <linux/cpuidle.h>
  35 #include <linux/devfreq.h>
  36 #include <linux/timer.h>
  37
  38 #include "../base.h"
  39 #include "power.h"
  40
  41 typedef int (*pm_callback_t)(struct device *);
  42
  43 /*
  44  * The entries in the dpm_list list are in a depth first order, simply
  45  * because children are guaranteed to be discovered after parents, and
  46  * are inserted at the back of the list on discovery.
  47  *
  48  * Since device_pm_add() may be called with a device lock held,
  49  * we must never try to acquire a device lock while holding
  50  * dpm_list_mutex.
  51  */
  52
  53 LIST_HEAD(dpm_list);
  54 static LIST_HEAD(dpm_prepared_list);
  55 static LIST_HEAD(dpm_suspended_list);
  56 static LIST_HEAD(dpm_late_early_list);
  57 static LIST_HEAD(dpm_noirq_list);
  58
  59 struct suspend_stats suspend_stats;
  60 static DEFINE_MUTEX(dpm_list_mtx);
  61 static pm_message_t pm_transition;
  62
  63 static int async_error;
  64
  65 static const char *pm_verb(int event)
  66 {
  67         switch (event) {
  68         case PM_EVENT_SUSPEND:
  69                 return "suspend";
  70         case PM_EVENT_RESUME:
  71                 return "resume";
  72         case PM_EVENT_FREEZE:
  73                 return "freeze";
  74         case PM_EVENT_QUIESCE:
  75                 return "quiesce";
  76         case PM_EVENT_HIBERNATE:
  77                 return "hibernate";
  78         case PM_EVENT_THAW:
  79                 return "thaw";
  80         case PM_EVENT_RESTORE:
  81                 return "restore";
  82         case PM_EVENT_RECOVER:
  83                 return "recover";
  84         default:
  85                 return "(unknown PM event)";
  86         }
  87 }
  88
  89 /**
  90  * device_pm_sleep_init - Initialize system suspend-related device fields.
  91  * @dev: Device object being initialized.
  92  */
  93 void device_pm_sleep_init(struct device *dev)
  94 {
  95         dev->power.is_prepared = false;
  96         dev->power.is_suspended = false;
  97         dev->power.is_noirq_suspended = false;
  98         dev->power.is_late_suspended = false;
  99         init_completion(&dev->power.completion);
 100         complete_all(&dev->power.completion);
 101         dev->power.wakeup = NULL;
 102         INIT_LIST_HEAD(&dev->power.entry);
 103 }
 104
 105 /**
 106  * device_pm_lock - Lock the list of active devices used by the PM core.
 107  */
 108 void device_pm_lock(void)
 109 {
 110         mutex_lock(&dpm_list_mtx);
 111 }
 112
 113 /**
 114  * device_pm_unlock - Unlock the list of active devices used by the PM core.
 115  */
 116 void device_pm_unlock(void)
 117 {
 118         mutex_unlock(&dpm_list_mtx);
 119 }
 120
 121 /**
 122  * device_pm_add - Add a device to the PM core's list of active devices.
 123  * @dev: Device to add to the list.
 124  */
 125 void device_pm_add(struct device *dev)
 126 {
 127         /* Skip PM setup/initialization. */
 128         if (device_pm_not_required(dev))
 129                 return;
 130
 131         pr_debug("Adding info for %s:%s\n",
 132                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 133         device_pm_check_callbacks(dev);
 134         mutex_lock(&dpm_list_mtx);
 135         if (dev->parent && dev->parent->power.is_prepared)
 136                 dev_warn(dev, "parent %s should not be sleeping\n",
 137                         dev_name(dev->parent));
 138         list_add_tail(&dev->power.entry, &dpm_list);
 139         dev->power.in_dpm_list = true;
 140         mutex_unlock(&dpm_list_mtx);
 141 }
 142
 143 /**
 144  * device_pm_remove - Remove a device from the PM core's list of active devices.
 145  * @dev: Device to be removed from the list.
 146  */
 147 void device_pm_remove(struct device *dev)
 148 {
 149         if (device_pm_not_required(dev))
 150                 return;
 151
 152         pr_debug("Removing info for %s:%s\n",
 153                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 154         complete_all(&dev->power.completion);
 155         mutex_lock(&dpm_list_mtx);
 156         list_del_init(&dev->power.entry);
 157         dev->power.in_dpm_list = false;
 158         mutex_unlock(&dpm_list_mtx);
 159         device_wakeup_disable(dev);
 160         pm_runtime_remove(dev);
 161         device_pm_check_callbacks(dev);
 162 }
 163
 164 /**
 165  * device_pm_move_before - Move device in the PM core's list of active devices.
 166  * @deva: Device to move in dpm_list.
 167  * @devb: Device @deva should come before.
 168  */
 169 void device_pm_move_before(struct device *deva, struct device *devb)
 170 {
 171         pr_debug("Moving %s:%s before %s:%s\n",
 172                  deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
 173                  devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 174         /* Delete deva from dpm_list and reinsert before devb. */
 175         list_move_tail(&deva->power.entry, &devb->power.entry);
 176 }
 177
 178 /**
 179  * device_pm_move_after - Move device in the PM core's list of active devices.
 180  * @deva: Device to move in dpm_list.
 181  * @devb: Device @deva should come after.
 182  */
 183 void device_pm_move_after(struct device *deva, struct device *devb)
 184 {
 185         pr_debug("Moving %s:%s after %s:%s\n",
 186                  deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
 187                  devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 188         /* Delete deva from dpm_list and reinsert after devb. */
 189         list_move(&deva->power.entry, &devb->power.entry);
 190 }
 191
 192 /**
 193  * device_pm_move_last - Move device to end of the PM core's list of devices.
 194  * @dev: Device to move in dpm_list.
 195  */
 196 void device_pm_move_last(struct device *dev)
 197 {
 198         pr_debug("Moving %s:%s to end of list\n",
 199                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 200         list_move_tail(&dev->power.entry, &dpm_list);
 201 }
 202
 203 static ktime_t initcall_debug_start(struct device *dev, void *cb)
 204 {
 205         if (!pm_print_times_enabled)
 206                 return 0;
 207
 208         dev_info(dev, "calling %pS @ %i, parent: %s\n", cb,
 209                  task_pid_nr(current),
 210                  dev->parent ? dev_name(dev->parent) : "none");
 211         return ktime_get();
 212 }
 213
 214 static void initcall_debug_report(struct device *dev, ktime_t calltime,
 215                                   void *cb, int error)
 216 {
 217         ktime_t rettime;
 218         s64 nsecs;
 219
 220         if (!pm_print_times_enabled)
 221                 return;
 222
 223         rettime = ktime_get();
 224         nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime));
 225
 226         dev_info(dev, "%pS returned %d after %Ld usecs\n", cb, error,
 227                  (unsigned long long)nsecs >> 10);
 228 }
 229
 230 /**
 231  * dpm_wait - Wait for a PM operation to complete.
 232  * @dev: Device to wait for.
 233  * @async: If unset, wait only if the device's power.async_suspend flag is set.
 234  */
 235 static void dpm_wait(struct device *dev, bool async)
 236 {
 237         if (!dev)
 238                 return;
 239
 240         if (async || (pm_async_enabled && dev->power.async_suspend))
 241                 wait_for_completion(&dev->power.completion);
 242 }
 243
 244 static int dpm_wait_fn(struct device *dev, void *async_ptr)
 245 {
 246         dpm_wait(dev, *((bool *)async_ptr));
 247         return 0;
 248 }
 249
 250 static void dpm_wait_for_children(struct device *dev, bool async)
 251 {
 252        device_for_each_child(dev, &async, dpm_wait_fn);
 253 }
 254
 255 static void dpm_wait_for_suppliers(struct device *dev, bool async)
 256 {
 257         struct device_link *link;
 258         int idx;
 259
 260         idx = device_links_read_lock();
 261
 262         /*
 263          * If the supplier goes away right after we've checked the link to it,
 264          * we'll wait for its completion to change the state, but that's fine,
 265          * because the only things that will block as a result are the SRCU
 266          * callbacks freeing the link objects for the links in the list we're
 267          * walking.
 268          */
 269         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
 270                 if (READ_ONCE(link->status) != DL_STATE_DORMANT)
 271                         dpm_wait(link->supplier, async);
 272
 273         device_links_read_unlock(idx);
 274 }
 275
 276 static void dpm_wait_for_superior(struct device *dev, bool async)
 277 {
 278         dpm_wait(dev->parent, async);
 279         dpm_wait_for_suppliers(dev, async);
 280 }
 281
 282 static void dpm_wait_for_consumers(struct device *dev, bool async)
 283 {
 284         struct device_link *link;
 285         int idx;
 286
 287         idx = device_links_read_lock();
 288
 289         /*
 290          * The status of a device link can only be changed from "dormant" by a
 291          * probe, but that cannot happen during system suspend/resume.  In
 292          * theory it can change to "dormant" at that time, but then it is
 293          * reasonable to wait for the target device anyway (eg. if it goes
 294          * away, it's better to wait for it to go away completely and then
 295          * continue instead of trying to continue in parallel with its
 296          * unregistration).
 297          */
 298         list_for_each_entry_rcu(link, &dev->links.consumers, s_node)
 299                 if (READ_ONCE(link->status) != DL_STATE_DORMANT)
 300                         dpm_wait(link->consumer, async);
 301
 302         device_links_read_unlock(idx);
 303 }
 304
 305 static void dpm_wait_for_subordinate(struct device *dev, bool async)
 306 {
 307         dpm_wait_for_children(dev, async);
 308         dpm_wait_for_consumers(dev, async);
 309 }
 310
 311 /**
 312  * pm_op - Return the PM operation appropriate for given PM event.
 313  * @ops: PM operations to choose from.
 314  * @state: PM transition of the system being carried out.
 315  */
 316 static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
 317 {
 318         switch (state.event) {
 319 #ifdef CONFIG_SUSPEND
 320         case PM_EVENT_SUSPEND:
 321                 return ops->suspend;
 322         case PM_EVENT_RESUME:
 323                 return ops->resume;
 324 #endif /* CONFIG_SUSPEND */
 325 #ifdef CONFIG_HIBERNATE_CALLBACKS
 326         case PM_EVENT_FREEZE:
 327         case PM_EVENT_QUIESCE:
 328                 return ops->freeze;
 329         case PM_EVENT_HIBERNATE:
 330                 return ops->poweroff;
 331         case PM_EVENT_THAW:
 332         case PM_EVENT_RECOVER:
 333                 return ops->thaw;
 334                 break;
 335         case PM_EVENT_RESTORE:
 336                 return ops->restore;
 337 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 338         }
 339
 340         return NULL;
 341 }
 342
 343 /**
 344  * pm_late_early_op - Return the PM operation appropriate for given PM event.
 345  * @ops: PM operations to choose from.
 346  * @state: PM transition of the system being carried out.
 347  *
 348  * Runtime PM is disabled for @dev while this function is being executed.
 349  */
 350 static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
 351                                       pm_message_t state)
 352 {
 353         switch (state.event) {
 354 #ifdef CONFIG_SUSPEND
 355         case PM_EVENT_SUSPEND:
 356                 return ops->suspend_late;
 357         case PM_EVENT_RESUME:
 358                 return ops->resume_early;
 359 #endif /* CONFIG_SUSPEND */
 360 #ifdef CONFIG_HIBERNATE_CALLBACKS
 361         case PM_EVENT_FREEZE:
 362         case PM_EVENT_QUIESCE:
 363                 return ops->freeze_late;
 364         case PM_EVENT_HIBERNATE:
 365                 return ops->poweroff_late;
 366         case PM_EVENT_THAW:
 367         case PM_EVENT_RECOVER:
 368                 return ops->thaw_early;
 369         case PM_EVENT_RESTORE:
 370                 return ops->restore_early;
 371 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 372         }
 373
 374         return NULL;
 375 }
 376
 377 /**
 378  * pm_noirq_op - Return the PM operation appropriate for given PM event.
 379  * @ops: PM operations to choose from.
 380  * @state: PM transition of the system being carried out.
 381  *
 382  * The driver of @dev will not receive interrupts while this function is being
 383  * executed.
 384  */
 385 static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
 386 {
 387         switch (state.event) {
 388 #ifdef CONFIG_SUSPEND
 389         case PM_EVENT_SUSPEND:
 390                 return ops->suspend_noirq;
 391         case PM_EVENT_RESUME:
 392                 return ops->resume_noirq;
 393 #endif /* CONFIG_SUSPEND */
 394 #ifdef CONFIG_HIBERNATE_CALLBACKS
 395         case PM_EVENT_FREEZE:
 396         case PM_EVENT_QUIESCE:
 397                 return ops->freeze_noirq;
 398         case PM_EVENT_HIBERNATE:
 399                 return ops->poweroff_noirq;
 400         case PM_EVENT_THAW:
 401         case PM_EVENT_RECOVER:
 402                 return ops->thaw_noirq;
 403         case PM_EVENT_RESTORE:
 404                 return ops->restore_noirq;
 405 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 406         }
 407
 408         return NULL;
 409 }
 410
 411 static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info)
 412 {
 413         dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
 414                 ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
 415                 ", may wakeup" : "");
 416 }
 417
 418 static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,
 419                         int error)
 420 {
 421         pr_err("Device %s failed to %s%s: error %d\n",
 422                dev_name(dev), pm_verb(state.event), info, error);
 423 }
 424
 425 static void dpm_show_time(ktime_t starttime, pm_message_t state, int error,
 426                           const char *info)
 427 {
 428         ktime_t calltime;
 429         u64 usecs64;
 430         int usecs;
 431
 432         calltime = ktime_get();
 433         usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
 434         do_div(usecs64, NSEC_PER_USEC);
 435         usecs = usecs64;
 436         if (usecs == 0)
 437                 usecs = 1;
 438
 439         pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n",
 440                   info ?: "", info ? " " : "", pm_verb(state.event),
 441                   error ? "aborted" : "complete",
 442                   usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
 443 }
 444
 445 static int dpm_run_callback(pm_callback_t cb, struct device *dev,
 446                             pm_message_t state, const char *info)
 447 {
 448         ktime_t calltime;
 449         int error;
 450
 451         if (!cb)
 452                 return 0;
 453
 454         calltime = initcall_debug_start(dev, cb);
 455
 456         pm_dev_dbg(dev, state, info);
 457         trace_device_pm_callback_start(dev, info, state.event);
 458         error = cb(dev);
 459         trace_device_pm_callback_end(dev, error);
 460         suspend_report_result(cb, error);
 461
 462         initcall_debug_report(dev, calltime, cb, error);
 463
 464         return error;
 465 }
 466
 467 #ifdef CONFIG_DPM_WATCHDOG
 468 struct dpm_watchdog {
 469         struct device           *dev;
 470         struct task_struct      *tsk;
 471         struct timer_list       timer;
 472 };
 473
 474 #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
 475         struct dpm_watchdog wd
 476
 477 /**
 478  * dpm_watchdog_handler - Driver suspend / resume watchdog handler.
 479  * @t: The timer that PM watchdog depends on.
 480  *
 481  * Called when a driver has timed out suspending or resuming.
 482  * There's not much we can do here to recover so panic() to
 483  * capture a crash-dump in pstore.
 484  */
 485 static void dpm_watchdog_handler(struct timer_list *t)
 486 {
 487         struct dpm_watchdog *wd = from_timer(wd, t, timer);
 488
 489         dev_emerg(wd->dev, "**** DPM device timeout ****\n");
 490         show_stack(wd->tsk, NULL);
 491         panic("%s %s: unrecoverable failure\n",
 492                 dev_driver_string(wd->dev), dev_name(wd->dev));
 493 }
 494
 495 /**
 496  * dpm_watchdog_set - Enable pm watchdog for given device.
 497  * @wd: Watchdog. Must be allocated on the stack.
 498  * @dev: Device to handle.
 499  */
 500 static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev)
 501 {
 502         struct timer_list *timer = &wd->timer;
 503
 504         wd->dev = dev;
 505         wd->tsk = current;
 506
 507         timer_setup_on_stack(timer, dpm_watchdog_handler, 0);
 508         /* use same timeout value for both suspend and resume */
 509         timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT;
 510         add_timer(timer);
 511 }
 512
 513 /**
 514  * dpm_watchdog_clear - Disable suspend/resume watchdog.
 515  * @wd: Watchdog to disable.
 516  */
 517 static void dpm_watchdog_clear(struct dpm_watchdog *wd)
 518 {
 519         struct timer_list *timer = &wd->timer;
 520
 521         del_timer_sync(timer);
 522         destroy_timer_on_stack(timer);
 523 }
 524 #else
 525 #define DECLARE_DPM_WATCHDOG_ON_STACK(wd)
 526 #define dpm_watchdog_set(x, y)
 527 #define dpm_watchdog_clear(x)
 528 #endif
 529
 530 /*------------------------- Resume routines -------------------------*/
 531
 532 /**
 533  * dev_pm_skip_next_resume_phases - Skip next system resume phases for device.
 534  * @dev: Target device.
 535  *
 536  * Make the core skip the "early resume" and "resume" phases for @dev.
 537  *
 538  * This function can be called by middle-layer code during the "noirq" phase of
 539  * system resume if necessary, but not by device drivers.
 540  */
 541 void dev_pm_skip_next_resume_phases(struct device *dev)
 542 {
 543         dev->power.is_late_suspended = false;
 544         dev->power.is_suspended = false;
 545 }
 546
 547 /**
 548  * suspend_event - Return a "suspend" message for given "resume" one.
 549  * @resume_msg: PM message representing a system-wide resume transition.
 550  */
 551 static pm_message_t suspend_event(pm_message_t resume_msg)
 552 {
 553         switch (resume_msg.event) {
 554         case PM_EVENT_RESUME:
 555                 return PMSG_SUSPEND;
 556         case PM_EVENT_THAW:
 557         case PM_EVENT_RESTORE:
 558                 return PMSG_FREEZE;
 559         case PM_EVENT_RECOVER:
 560                 return PMSG_HIBERNATE;
 561         }
 562         return PMSG_ON;
 563 }
 564
 565 /**
 566  * dev_pm_may_skip_resume - System-wide device resume optimization check.
 567  * @dev: Target device.
 568  *
 569  * Checks whether or not the device may be left in suspend after a system-wide
 570  * transition to the working state.
 571  */
 572 bool dev_pm_may_skip_resume(struct device *dev)
 573 {
 574         return !dev->power.must_resume && pm_transition.event != PM_EVENT_RESTORE;
 575 }
 576
 577 static pm_callback_t dpm_subsys_resume_noirq_cb(struct device *dev,
 578                                                 pm_message_t state,
 579                                                 const char **info_p)
 580 {
 581         pm_callback_t callback;
 582         const char *info;
 583
 584         if (dev->pm_domain) {
 585                 info = "noirq power domain ";
 586                 callback = pm_noirq_op(&dev->pm_domain->ops, state);
 587         } else if (dev->type && dev->type->pm) {
 588                 info = "noirq type ";
 589                 callback = pm_noirq_op(dev->type->pm, state);
 590         } else if (dev->class && dev->class->pm) {
 591                 info = "noirq class ";
 592                 callback = pm_noirq_op(dev->class->pm, state);
 593         } else if (dev->bus && dev->bus->pm) {
 594                 info = "noirq bus ";
 595                 callback = pm_noirq_op(dev->bus->pm, state);
 596         } else {
 597                 return NULL;
 598         }
 599
 600         if (info_p)
 601                 *info_p = info;
 602
 603         return callback;
 604 }
 605
 606 static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
 607                                                  pm_message_t state,
 608                                                  const char **info_p);
 609
 610 static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
 611                                                 pm_message_t state,
 612                                                 const char **info_p);
 613
 614 /**
 615  * device_resume_noirq - Execute a "noirq resume" callback for given device.
 616  * @dev: Device to handle.
 617  * @state: PM transition of the system being carried out.
 618  * @async: If true, the device is being resumed asynchronously.
 619  *
 620  * The driver of @dev will not receive interrupts while this function is being
 621  * executed.
 622  */
 623 static int device_resume_noirq(struct device *dev, pm_message_t state, bool async)
 624 {
 625         pm_callback_t callback;
 626         const char *info;
 627         bool skip_resume;
 628         int error = 0;
 629
 630         TRACE_DEVICE(dev);
 631         TRACE_RESUME(0);
 632
 633         if (dev->power.syscore || dev->power.direct_complete)
 634                 goto Out;
 635
 636         if (!dev->power.is_noirq_suspended)
 637                 goto Out;
 638
 639         dpm_wait_for_superior(dev, async);
 640
 641         skip_resume = dev_pm_may_skip_resume(dev);
 642
 643         callback = dpm_subsys_resume_noirq_cb(dev, state, &info);
 644         if (callback)
 645                 goto Run;
 646
 647         if (skip_resume)
 648                 goto Skip;
 649
 650         if (dev_pm_smart_suspend_and_suspended(dev)) {
 651                 pm_message_t suspend_msg = suspend_event(state);
 652
 653                 /*
 654                  * If "freeze" callbacks have been skipped during a transition
 655                  * related to hibernation, the subsequent "thaw" callbacks must
 656                  * be skipped too or bad things may happen.  Otherwise, resume
 657                  * callbacks are going to be run for the device, so its runtime
 658                  * PM status must be changed to reflect the new state after the
 659                  * transition under way.
 660                  */
 661                 if (!dpm_subsys_suspend_late_cb(dev, suspend_msg, NULL) &&
 662                     !dpm_subsys_suspend_noirq_cb(dev, suspend_msg, NULL)) {
 663                         if (state.event == PM_EVENT_THAW) {
 664                                 skip_resume = true;
 665                                 goto Skip;
 666                         } else {
 667                                 pm_runtime_set_active(dev);
 668                         }
 669                 }
 670         }
 671
 672         if (dev->driver && dev->driver->pm) {
 673                 info = "noirq driver ";
 674                 callback = pm_noirq_op(dev->driver->pm, state);
 675         }
 676
 677 Run:
 678         error = dpm_run_callback(callback, dev, state, info);
 679
 680 Skip:
 681         dev->power.is_noirq_suspended = false;
 682
 683         if (skip_resume) {
 684                 /*
 685                  * The device is going to be left in suspend, but it might not
 686                  * have been in runtime suspend before the system suspended, so
 687                  * its runtime PM status needs to be updated to avoid confusing
 688                  * the runtime PM framework when runtime PM is enabled for the
 689                  * device again.
 690                  */
 691                 pm_runtime_set_suspended(dev);
 692                 dev_pm_skip_next_resume_phases(dev);
 693         }
 694
 695 Out:
 696         complete_all(&dev->power.completion);
 697         TRACE_RESUME(error);
 698         return error;
 699 }
 700
 701 static bool is_async(struct device *dev)
 702 {
 703         return dev->power.async_suspend && pm_async_enabled
 704                 && !pm_trace_is_enabled();
 705 }
 706
 707 static bool dpm_async_fn(struct device *dev, async_func_t func)
 708 {
 709         reinit_completion(&dev->power.completion);
 710
 711         if (is_async(dev)) {
 712                 get_device(dev);
 713                 async_schedule(func, dev);
 714                 return true;
 715         }
 716
 717         return false;
 718 }
 719
 720 static void async_resume_noirq(void *data, async_cookie_t cookie)
 721 {
 722         struct device *dev = (struct device *)data;
 723         int error;
 724
 725         error = device_resume_noirq(dev, pm_transition, true);
 726         if (error)
 727                 pm_dev_err(dev, pm_transition, " async", error);
 728
 729         put_device(dev);
 730 }
 731
 732 void dpm_noirq_resume_devices(pm_message_t state)
 733 {
 734         struct device *dev;
 735         ktime_t starttime = ktime_get();
 736
 737         trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true);
 738         mutex_lock(&dpm_list_mtx);
 739         pm_transition = state;
 740
 741         /*
 742          * Advanced the async threads upfront,
 743          * in case the starting of async threads is
 744          * delayed by non-async resuming devices.
 745          */
 746         list_for_each_entry(dev, &dpm_noirq_list, power.entry)
 747                 dpm_async_fn(dev, async_resume_noirq);
 748
 749         while (!list_empty(&dpm_noirq_list)) {
 750                 dev = to_device(dpm_noirq_list.next);
 751                 get_device(dev);
 752                 list_move_tail(&dev->power.entry, &dpm_late_early_list);
 753                 mutex_unlock(&dpm_list_mtx);
 754
 755                 if (!is_async(dev)) {
 756                         int error;
 757
 758                         error = device_resume_noirq(dev, state, false);
 759                         if (error) {
 760                                 suspend_stats.failed_resume_noirq++;
 761                                 dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
 762                                 dpm_save_failed_dev(dev_name(dev));
 763                                 pm_dev_err(dev, state, " noirq", error);
 764                         }
 765                 }
 766
 767                 mutex_lock(&dpm_list_mtx);
 768                 put_device(dev);
 769         }
 770         mutex_unlock(&dpm_list_mtx);
 771         async_synchronize_full();
 772         dpm_show_time(starttime, state, 0, "noirq");
 773         trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
 774 }
 775
 776 void dpm_noirq_end(void)
 777 {
 778         resume_device_irqs();
 779         device_wakeup_disarm_wake_irqs();
 780         cpuidle_resume();
 781 }
 782
 783 /**
 784  * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
 785  * @state: PM transition of the system being carried out.
 786  *
 787  * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and
 788  * allow device drivers' interrupt handlers to be called.
 789  */
 790 void dpm_resume_noirq(pm_message_t state)
 791 {
 792         dpm_noirq_resume_devices(state);
 793         dpm_noirq_end();
 794 }
 795
 796 static pm_callback_t dpm_subsys_resume_early_cb(struct device *dev,
 797                                                 pm_message_t state,
 798                                                 const char **info_p)
 799 {
 800         pm_callback_t callback;
 801         const char *info;
 802
 803         if (dev->pm_domain) {
 804                 info = "early power domain ";
 805                 callback = pm_late_early_op(&dev->pm_domain->ops, state);
 806         } else if (dev->type && dev->type->pm) {
 807                 info = "early type ";
 808                 callback = pm_late_early_op(dev->type->pm, state);
 809         } else if (dev->class && dev->class->pm) {
 810                 info = "early class ";
 811                 callback = pm_late_early_op(dev->class->pm, state);
 812         } else if (dev->bus && dev->bus->pm) {
 813                 info = "early bus ";
 814                 callback = pm_late_early_op(dev->bus->pm, state);
 815         } else {
 816                 return NULL;
 817         }
 818
 819         if (info_p)
 820                 *info_p = info;
 821
 822         return callback;
 823 }
 824
 825 /**
 826  * device_resume_early - Execute an "early resume" callback for given device.
 827  * @dev: Device to handle.
 828  * @state: PM transition of the system being carried out.
 829  * @async: If true, the device is being resumed asynchronously.
 830  *
 831  * Runtime PM is disabled for @dev while this function is being executed.
 832  */
 833 static int device_resume_early(struct device *dev, pm_message_t state, bool async)
 834 {
 835         pm_callback_t callback;
 836         const char *info;
 837         int error = 0;
 838
 839         TRACE_DEVICE(dev);
 840         TRACE_RESUME(0);
 841
 842         if (dev->power.syscore || dev->power.direct_complete)
 843                 goto Out;
 844
 845         if (!dev->power.is_late_suspended)
 846                 goto Out;
 847
 848         dpm_wait_for_superior(dev, async);
 849
 850         callback = dpm_subsys_resume_early_cb(dev, state, &info);
 851
 852         if (!callback && dev->driver && dev->driver->pm) {
 853                 info = "early driver ";
 854                 callback = pm_late_early_op(dev->driver->pm, state);
 855         }
 856
 857         error = dpm_run_callback(callback, dev, state, info);
 858         dev->power.is_late_suspended = false;
 859
 860  Out:
 861         TRACE_RESUME(error);
 862
 863         pm_runtime_enable(dev);
 864         complete_all(&dev->power.completion);
 865         return error;
 866 }
 867
 868 static void async_resume_early(void *data, async_cookie_t cookie)
 869 {
 870         struct device *dev = (struct device *)data;
 871         int error;
 872
 873         error = device_resume_early(dev, pm_transition, true);
 874         if (error)
 875                 pm_dev_err(dev, pm_transition, " async", error);
 876
 877         put_device(dev);
 878 }
 879
 880 /**
 881  * dpm_resume_early - Execute "early resume" callbacks for all devices.
 882  * @state: PM transition of the system being carried out.
 883  */
 884 void dpm_resume_early(pm_message_t state)
 885 {
 886         struct device *dev;
 887         ktime_t starttime = ktime_get();
 888
 889         trace_suspend_resume(TPS("dpm_resume_early"), state.event, true);
 890         mutex_lock(&dpm_list_mtx);
 891         pm_transition = state;
 892
 893         /*
 894          * Advanced the async threads upfront,
 895          * in case the starting of async threads is
 896          * delayed by non-async resuming devices.
 897          */
 898         list_for_each_entry(dev, &dpm_late_early_list, power.entry)
 899                 dpm_async_fn(dev, async_resume_early);
 900
 901         while (!list_empty(&dpm_late_early_list)) {
 902                 dev = to_device(dpm_late_early_list.next);
 903                 get_device(dev);
 904                 list_move_tail(&dev->power.entry, &dpm_suspended_list);
 905                 mutex_unlock(&dpm_list_mtx);
 906
 907                 if (!is_async(dev)) {
 908                         int error;
 909
 910                         error = device_resume_early(dev, state, false);
 911                         if (error) {
 912                                 suspend_stats.failed_resume_early++;
 913                                 dpm_save_failed_step(SUSPEND_RESUME_EARLY);
 914                                 dpm_save_failed_dev(dev_name(dev));
 915                                 pm_dev_err(dev, state, " early", error);
 916                         }
 917                 }
 918                 mutex_lock(&dpm_list_mtx);
 919                 put_device(dev);
 920         }
 921         mutex_unlock(&dpm_list_mtx);
 922         async_synchronize_full();
 923         dpm_show_time(starttime, state, 0, "early");
 924         trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
 925 }
 926
 927 /**
 928  * dpm_resume_start - Execute "noirq" and "early" device callbacks.
 929  * @state: PM transition of the system being carried out.
 930  */
 931 void dpm_resume_start(pm_message_t state)
 932 {
 933         dpm_resume_noirq(state);
 934         dpm_resume_early(state);
 935 }
 936 EXPORT_SYMBOL_GPL(dpm_resume_start);
 937
 938 /**
 939  * device_resume - Execute "resume" callbacks for given device.
 940  * @dev: Device to handle.
 941  * @state: PM transition of the system being carried out.
 942  * @async: If true, the device is being resumed asynchronously.
 943  */
 944 static int device_resume(struct device *dev, pm_message_t state, bool async)
 945 {
 946         pm_callback_t callback = NULL;
 947         const char *info = NULL;
 948         int error = 0;
 949         DECLARE_DPM_WATCHDOG_ON_STACK(wd);
 950
 951         TRACE_DEVICE(dev);
 952         TRACE_RESUME(0);
 953
 954         if (dev->power.syscore)
 955                 goto Complete;
 956
 957         if (dev->power.direct_complete) {
 958                 /* Match the pm_runtime_disable() in __device_suspend(). */
 959                 pm_runtime_enable(dev);
 960                 goto Complete;
 961         }
 962
 963         dpm_wait_for_superior(dev, async);
 964         dpm_watchdog_set(&wd, dev);
 965         device_lock(dev);
 966
 967         /*
 968          * This is a fib.  But we'll allow new children to be added below
 969          * a resumed device, even if the device hasn't been completed yet.
 970          */
 971         dev->power.is_prepared = false;
 972
 973         if (!dev->power.is_suspended)
 974                 goto Unlock;
 975
 976         if (dev->pm_domain) {
 977                 info = "power domain ";
 978                 callback = pm_op(&dev->pm_domain->ops, state);
 979                 goto Driver;
 980         }
 981
 982         if (dev->type && dev->type->pm) {
 983                 info = "type ";
 984                 callback = pm_op(dev->type->pm, state);
 985                 goto Driver;
 986         }
 987
 988         if (dev->class && dev->class->pm) {
 989                 info = "class ";
 990                 callback = pm_op(dev->class->pm, state);
 991                 goto Driver;
 992         }
 993
 994         if (dev->bus) {
 995                 if (dev->bus->pm) {
 996                         info = "bus ";
 997                         callback = pm_op(dev->bus->pm, state);
 998                 } else if (dev->bus->resume) {
 999                         info = "legacy bus ";
1000                         callback = dev->bus->resume;
1001                         goto End;
1002                 }
1003         }
1004
1005  Driver:
1006         if (!callback && dev->driver && dev->driver->pm) {
1007                 info = "driver ";
1008                 callback = pm_op(dev->driver->pm, state);
1009         }
1010
1011  End:
1012         error = dpm_run_callback(callback, dev, state, info);
1013         dev->power.is_suspended = false;
1014
1015  Unlock:
1016         device_unlock(dev);
1017         dpm_watchdog_clear(&wd);
1018
1019  Complete:
1020         complete_all(&dev->power.completion);
1021
1022         TRACE_RESUME(error);
1023
1024         return error;
1025 }
1026
1027 static void async_resume(void *data, async_cookie_t cookie)
1028 {
1029         struct device *dev = (struct device *)data;
1030         int error;
1031
1032         error = device_resume(dev, pm_transition, true);
1033         if (error)
1034                 pm_dev_err(dev, pm_transition, " async", error);
1035         put_device(dev);
1036 }
1037
1038 /**
1039  * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
1040  * @state: PM transition of the system being carried out.
1041  *
1042  * Execute the appropriate "resume" callback for all devices whose status
1043  * indicates that they are suspended.
1044  */
1045 void dpm_resume(pm_message_t state)
1046 {
1047         struct device *dev;
1048         ktime_t starttime = ktime_get();
1049
1050         trace_suspend_resume(TPS("dpm_resume"), state.event, true);
1051         might_sleep();
1052
1053         mutex_lock(&dpm_list_mtx);
1054         pm_transition = state;
1055         async_error = 0;
1056
1057         list_for_each_entry(dev, &dpm_suspended_list, power.entry)
1058                 dpm_async_fn(dev, async_resume);
1059
1060         while (!list_empty(&dpm_suspended_list)) {
1061                 dev = to_device(dpm_suspended_list.next);
1062                 get_device(dev);
1063                 if (!is_async(dev)) {
1064                         int error;
1065
1066                         mutex_unlock(&dpm_list_mtx);
1067
1068                         error = device_resume(dev, state, false);
1069                         if (error) {
1070                                 suspend_stats.failed_resume++;
1071                                 dpm_save_failed_step(SUSPEND_RESUME);
1072                                 dpm_save_failed_dev(dev_name(dev));
1073                                 pm_dev_err(dev, state, "", error);
1074                         }
1075
1076                         mutex_lock(&dpm_list_mtx);
1077                 }
1078                 if (!list_empty(&dev->power.entry))
1079                         list_move_tail(&dev->power.entry, &dpm_prepared_list);
1080                 put_device(dev);
1081         }
1082         mutex_unlock(&dpm_list_mtx);
1083         async_synchronize_full();
1084         dpm_show_time(starttime, state, 0, NULL);
1085
1086         cpufreq_resume();
1087         devfreq_resume();
1088         trace_suspend_resume(TPS("dpm_resume"), state.event, false);
1089 }
1090
1091 /**
1092  * device_complete - Complete a PM transition for given device.
1093  * @dev: Device to handle.
1094  * @state: PM transition of the system being carried out.
1095  */
1096 static void device_complete(struct device *dev, pm_message_t state)
1097 {
1098         void (*callback)(struct device *) = NULL;
1099         const char *info = NULL;
1100
1101         if (dev->power.syscore)
1102                 return;
1103
1104         device_lock(dev);
1105
1106         if (dev->pm_domain) {
1107                 info = "completing power domain ";
1108                 callback = dev->pm_domain->ops.complete;
1109         } else if (dev->type && dev->type->pm) {
1110                 info = "completing type ";
1111                 callback = dev->type->pm->complete;
1112         } else if (dev->class && dev->class->pm) {
1113                 info = "completing class ";
1114                 callback = dev->class->pm->complete;
1115         } else if (dev->bus && dev->bus->pm) {
1116                 info = "completing bus ";
1117                 callback = dev->bus->pm->complete;
1118         }
1119
1120         if (!callback && dev->driver && dev->driver->pm) {
1121                 info = "completing driver ";
1122                 callback = dev->driver->pm->complete;
1123         }
1124
1125         if (callback) {
1126                 pm_dev_dbg(dev, state, info);
1127                 callback(dev);
1128         }
1129
1130         device_unlock(dev);
1131
1132         pm_runtime_put(dev);
1133 }
1134
1135 /**
1136  * dpm_complete - Complete a PM transition for all non-sysdev devices.
1137  * @state: PM transition of the system being carried out.
1138  *
1139  * Execute the ->complete() callbacks for all devices whose PM status is not
1140  * DPM_ON (this allows new devices to be registered).
1141  */
1142 void dpm_complete(pm_message_t state)
1143 {
1144         struct list_head list;
1145
1146         trace_suspend_resume(TPS("dpm_complete"), state.event, true);
1147         might_sleep();
1148
1149         INIT_LIST_HEAD(&list);
1150         mutex_lock(&dpm_list_mtx);
1151         while (!list_empty(&dpm_prepared_list)) {
1152                 struct device *dev = to_device(dpm_prepared_list.prev);
1153
1154                 get_device(dev);
1155                 dev->power.is_prepared = false;
1156                 list_move(&dev->power.entry, &list);
1157                 mutex_unlock(&dpm_list_mtx);
1158
1159                 trace_device_pm_callback_start(dev, "", state.event);
1160                 device_complete(dev, state);
1161                 trace_device_pm_callback_end(dev, 0);
1162
1163                 mutex_lock(&dpm_list_mtx);
1164                 put_device(dev);
1165         }
1166         list_splice(&list, &dpm_list);
1167         mutex_unlock(&dpm_list_mtx);
1168
1169         /* Allow device probing and trigger re-probing of deferred devices */
1170         device_unblock_probing();
1171         trace_suspend_resume(TPS("dpm_complete"), state.event, false);
1172 }
1173
1174 /**
1175  * dpm_resume_end - Execute "resume" callbacks and complete system transition.
1176  * @state: PM transition of the system being carried out.
1177  *
1178  * Execute "resume" callbacks for all devices and complete the PM transition of
1179  * the system.
1180  */
1181 void dpm_resume_end(pm_message_t state)
1182 {
1183         dpm_resume(state);
1184         dpm_complete(state);
1185 }
1186 EXPORT_SYMBOL_GPL(dpm_resume_end);
1187
1188
1189 /*------------------------- Suspend routines -------------------------*/
1190
1191 /**
1192  * resume_event - Return a "resume" message for given "suspend" sleep state.
1193  * @sleep_state: PM message representing a sleep state.
1194  *
1195  * Return a PM message representing the resume event corresponding to given
1196  * sleep state.
1197  */
1198 static pm_message_t resume_event(pm_message_t sleep_state)
1199 {
1200         switch (sleep_state.event) {
1201         case PM_EVENT_SUSPEND:
1202                 return PMSG_RESUME;
1203         case PM_EVENT_FREEZE:
1204         case PM_EVENT_QUIESCE:
1205                 return PMSG_RECOVER;
1206         case PM_EVENT_HIBERNATE:
1207                 return PMSG_RESTORE;
1208         }
1209         return PMSG_ON;
1210 }
1211
1212 static void dpm_superior_set_must_resume(struct device *dev)
1213 {
1214         struct device_link *link;
1215         int idx;
1216
1217         if (dev->parent)
1218                 dev->parent->power.must_resume = true;
1219
1220         idx = device_links_read_lock();
1221
1222         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
1223                 link->supplier->power.must_resume = true;
1224
1225         device_links_read_unlock(idx);
1226 }
1227
1228 static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
1229                                                  pm_message_t state,
1230                                                  const char **info_p)
1231 {
1232         pm_callback_t callback;
1233         const char *info;
1234
1235         if (dev->pm_domain) {
1236                 info = "noirq power domain ";
1237                 callback = pm_noirq_op(&dev->pm_domain->ops, state);
1238         } else if (dev->type && dev->type->pm) {
1239                 info = "noirq type ";
1240                 callback = pm_noirq_op(dev->type->pm, state);
1241         } else if (dev->class && dev->class->pm) {
1242                 info = "noirq class ";
1243                 callback = pm_noirq_op(dev->class->pm, state);
1244         } else if (dev->bus && dev->bus->pm) {
1245                 info = "noirq bus ";
1246                 callback = pm_noirq_op(dev->bus->pm, state);
1247         } else {
1248                 return NULL;
1249         }
1250
1251         if (info_p)
1252                 *info_p = info;
1253
1254         return callback;
1255 }
1256
1257 static bool device_must_resume(struct device *dev, pm_message_t state,
1258                                bool no_subsys_suspend_noirq)
1259 {
1260         pm_message_t resume_msg = resume_event(state);
1261
1262         /*
1263          * If all of the device driver's "noirq", "late" and "early" callbacks
1264          * are invoked directly by the core, the decision to allow the device to
1265          * stay in suspend can be based on its current runtime PM status and its
1266          * wakeup settings.
1267          */
1268         if (no_subsys_suspend_noirq &&
1269             !dpm_subsys_suspend_late_cb(dev, state, NULL) &&
1270             !dpm_subsys_resume_early_cb(dev, resume_msg, NULL) &&
1271             !dpm_subsys_resume_noirq_cb(dev, resume_msg, NULL))
1272                 return !pm_runtime_status_suspended(dev) &&
1273                         (resume_msg.event != PM_EVENT_RESUME ||
1274                          (device_can_wakeup(dev) && !device_may_wakeup(dev)));
1275
1276         /*
1277          * The only safe strategy here is to require that if the device may not
1278          * be left in suspend, resume callbacks must be invoked for it.
1279          */
1280         return !dev->power.may_skip_resume;
1281 }
1282
1283 /**
1284  * __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
1285  * @dev: Device to handle.
1286  * @state: PM transition of the system being carried out.
1287  * @async: If true, the device is being suspended asynchronously.
1288  *
1289  * The driver of @dev will not receive interrupts while this function is being
1290  * executed.
1291  */
1292 static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
1293 {
1294         pm_callback_t callback;
1295         const char *info;
1296         bool no_subsys_cb = false;
1297         int error = 0;
1298
1299         TRACE_DEVICE(dev);
1300         TRACE_SUSPEND(0);
1301
1302         dpm_wait_for_subordinate(dev, async);
1303
1304         if (async_error)
1305                 goto Complete;
1306
1307         if (pm_wakeup_pending()) {
1308                 async_error = -EBUSY;
1309                 goto Complete;
1310         }
1311
1312         if (dev->power.syscore || dev->power.direct_complete)
1313                 goto Complete;
1314
1315         callback = dpm_subsys_suspend_noirq_cb(dev, state, &info);
1316         if (callback)
1317                 goto Run;
1318
1319         no_subsys_cb = !dpm_subsys_suspend_late_cb(dev, state, NULL);
1320
1321         if (dev_pm_smart_suspend_and_suspended(dev) && no_subsys_cb)
1322                 goto Skip;
1323
1324         if (dev->driver && dev->driver->pm) {
1325                 info = "noirq driver ";
1326                 callback = pm_noirq_op(dev->driver->pm, state);
1327         }
1328
1329 Run:
1330         error = dpm_run_callback(callback, dev, state, info);
1331         if (error) {
1332                 async_error = error;
1333                 goto Complete;
1334         }
1335
1336 Skip:
1337         dev->power.is_noirq_suspended = true;
1338
1339         if (dev_pm_test_driver_flags(dev, DPM_FLAG_LEAVE_SUSPENDED)) {
1340                 dev->power.must_resume = dev->power.must_resume ||
1341                                 atomic_read(&dev->power.usage_count) > 1 ||
1342                                 device_must_resume(dev, state, no_subsys_cb);
1343         } else {
1344                 dev->power.must_resume = true;
1345         }
1346
1347         if (dev->power.must_resume)
1348                 dpm_superior_set_must_resume(dev);
1349
1350 Complete:
1351         complete_all(&dev->power.completion);
1352         TRACE_SUSPEND(error);
1353         return error;
1354 }
1355
1356 static void async_suspend_noirq(void *data, async_cookie_t cookie)
1357 {
1358         struct device *dev = (struct device *)data;
1359         int error;
1360
1361         error = __device_suspend_noirq(dev, pm_transition, true);
1362         if (error) {
1363                 dpm_save_failed_dev(dev_name(dev));
1364                 pm_dev_err(dev, pm_transition, " async", error);
1365         }
1366
1367         put_device(dev);
1368 }
1369
1370 static int device_suspend_noirq(struct device *dev)
1371 {
1372         if (dpm_async_fn(dev, async_suspend_noirq))
1373                 return 0;
1374
1375         return __device_suspend_noirq(dev, pm_transition, false);
1376 }
1377
1378 void dpm_noirq_begin(void)
1379 {
1380         cpuidle_pause();
1381         device_wakeup_arm_wake_irqs();
1382         suspend_device_irqs();
1383 }
1384
1385 int dpm_noirq_suspend_devices(pm_message_t state)
1386 {
1387         ktime_t starttime = ktime_get();
1388         int error = 0;
1389
1390         trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
1391         mutex_lock(&dpm_list_mtx);
1392         pm_transition = state;
1393         async_error = 0;
1394
1395         while (!list_empty(&dpm_late_early_list)) {
1396                 struct device *dev = to_device(dpm_late_early_list.prev);
1397
1398                 get_device(dev);
1399                 mutex_unlock(&dpm_list_mtx);
1400
1401                 error = device_suspend_noirq(dev);
1402
1403                 mutex_lock(&dpm_list_mtx);
1404                 if (error) {
1405                         pm_dev_err(dev, state, " noirq", error);
1406                         dpm_save_failed_dev(dev_name(dev));
1407                         put_device(dev);
1408                         break;
1409                 }
1410                 if (!list_empty(&dev->power.entry))
1411                         list_move(&dev->power.entry, &dpm_noirq_list);
1412                 put_device(dev);
1413
1414                 if (async_error)
1415                         break;
1416         }
1417         mutex_unlock(&dpm_list_mtx);
1418         async_synchronize_full();
1419         if (!error)
1420                 error = async_error;
1421
1422         if (error) {
1423                 suspend_stats.failed_suspend_noirq++;
1424                 dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
1425         }
1426         dpm_show_time(starttime, state, error, "noirq");
1427         trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
1428         return error;
1429 }
1430
1431 /**
1432  * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
1433  * @state: PM transition of the system being carried out.
1434  *
1435  * Prevent device drivers' interrupt handlers from being called and invoke
1436  * "noirq" suspend callbacks for all non-sysdev devices.
1437  */
1438 int dpm_suspend_noirq(pm_message_t state)
1439 {
1440         int ret;
1441
1442         dpm_noirq_begin();
1443         ret = dpm_noirq_suspend_devices(state);
1444         if (ret)
1445                 dpm_resume_noirq(resume_event(state));
1446
1447         return ret;
1448 }
1449
1450 static void dpm_propagate_wakeup_to_parent(struct device *dev)
1451 {
1452         struct device *parent = dev->parent;
1453
1454         if (!parent)
1455                 return;
1456
1457         spin_lock_irq(&parent->power.lock);
1458
1459         if (dev->power.wakeup_path && !parent->power.ignore_children)
1460                 parent->power.wakeup_path = true;
1461
1462         spin_unlock_irq(&parent->power.lock);
1463 }
1464
1465 static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
1466                                                 pm_message_t state,
1467                                                 const char **info_p)
1468 {
1469         pm_callback_t callback;
1470         const char *info;
1471
1472         if (dev->pm_domain) {
1473                 info = "late power domain ";
1474                 callback = pm_late_early_op(&dev->pm_domain->ops, state);
1475         } else if (dev->type && dev->type->pm) {
1476                 info = "late type ";
1477                 callback = pm_late_early_op(dev->type->pm, state);
1478         } else if (dev->class && dev->class->pm) {
1479                 info = "late class ";
1480                 callback = pm_late_early_op(dev->class->pm, state);
1481         } else if (dev->bus && dev->bus->pm) {
1482                 info = "late bus ";
1483                 callback = pm_late_early_op(dev->bus->pm, state);
1484         } else {
1485                 return NULL;
1486         }
1487
1488         if (info_p)
1489                 *info_p = info;
1490
1491         return callback;
1492 }
1493
1494 /**
1495  * __device_suspend_late - Execute a "late suspend" callback for given device.
1496  * @dev: Device to handle.
1497  * @state: PM transition of the system being carried out.
1498  * @async: If true, the device is being suspended asynchronously.
1499  *
1500  * Runtime PM is disabled for @dev while this function is being executed.
1501  */
1502 static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
1503 {
1504         pm_callback_t callback;
1505         const char *info;
1506         int error = 0;
1507
1508         TRACE_DEVICE(dev);
1509         TRACE_SUSPEND(0);
1510
1511         __pm_runtime_disable(dev, false);
1512
1513         dpm_wait_for_subordinate(dev, async);
1514
1515         if (async_error)
1516                 goto Complete;
1517
1518         if (pm_wakeup_pending()) {
1519                 async_error = -EBUSY;
1520                 goto Complete;
1521         }
1522
1523         if (dev->power.syscore || dev->power.direct_complete)
1524                 goto Complete;
1525
1526         callback = dpm_subsys_suspend_late_cb(dev, state, &info);
1527         if (callback)
1528                 goto Run;
1529
1530         if (dev_pm_smart_suspend_and_suspended(dev) &&
1531             !dpm_subsys_suspend_noirq_cb(dev, state, NULL))
1532                 goto Skip;
1533
1534         if (dev->driver && dev->driver->pm) {
1535                 info = "late driver ";
1536                 callback = pm_late_early_op(dev->driver->pm, state);
1537         }
1538
1539 Run:
1540         error = dpm_run_callback(callback, dev, state, info);
1541         if (error) {
1542                 async_error = error;
1543                 goto Complete;
1544         }
1545         dpm_propagate_wakeup_to_parent(dev);
1546
1547 Skip:
1548         dev->power.is_late_suspended = true;
1549
1550 Complete:
1551         TRACE_SUSPEND(error);
1552         complete_all(&dev->power.completion);
1553         return error;
1554 }
1555
1556 static void async_suspend_late(void *data, async_cookie_t cookie)
1557 {
1558         struct device *dev = (struct device *)data;
1559         int error;
1560
1561         error = __device_suspend_late(dev, pm_transition, true);
1562         if (error) {
1563                 dpm_save_failed_dev(dev_name(dev));
1564                 pm_dev_err(dev, pm_transition, " async", error);
1565         }
1566         put_device(dev);
1567 }
1568
1569 static int device_suspend_late(struct device *dev)
1570 {
1571         if (dpm_async_fn(dev, async_suspend_late))
1572                 return 0;
1573
1574         return __device_suspend_late(dev, pm_transition, false);
1575 }
1576
1577 /**
1578  * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
1579  * @state: PM transition of the system being carried out.
1580  */
1581 int dpm_suspend_late(pm_message_t state)
1582 {
1583         ktime_t starttime = ktime_get();
1584         int error = 0;
1585
1586         trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true);
1587         mutex_lock(&dpm_list_mtx);
1588         pm_transition = state;
1589         async_error = 0;
1590
1591         while (!list_empty(&dpm_suspended_list)) {
1592                 struct device *dev = to_device(dpm_suspended_list.prev);
1593
1594                 get_device(dev);
1595                 mutex_unlock(&dpm_list_mtx);
1596
1597                 error = device_suspend_late(dev);
1598
1599                 mutex_lock(&dpm_list_mtx);
1600                 if (!list_empty(&dev->power.entry))
1601                         list_move(&dev->power.entry, &dpm_late_early_list);
1602
1603                 if (error) {
1604                         pm_dev_err(dev, state, " late", error);
1605                         dpm_save_failed_dev(dev_name(dev));
1606                         put_device(dev);
1607                         break;
1608                 }
1609                 put_device(dev);
1610
1611                 if (async_error)
1612                         break;
1613         }
1614         mutex_unlock(&dpm_list_mtx);
1615         async_synchronize_full();
1616         if (!error)
1617                 error = async_error;
1618         if (error) {
1619                 suspend_stats.failed_suspend_late++;
1620                 dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
1621                 dpm_resume_early(resume_event(state));
1622         }
1623         dpm_show_time(starttime, state, error, "late");
1624         trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
1625         return error;
1626 }
1627
1628 /**
1629  * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
1630  * @state: PM transition of the system being carried out.
1631  */
1632 int dpm_suspend_end(pm_message_t state)
1633 {
1634         ktime_t starttime = ktime_get();
1635         int error;
1636
1637         error = dpm_suspend_late(state);
1638         if (error)
1639                 goto out;
1640
1641         error = dpm_suspend_noirq(state);
1642         if (error)
1643                 dpm_resume_early(resume_event(state));
1644
1645 out:
1646         dpm_show_time(starttime, state, error, "end");
1647         return error;
1648 }
1649 EXPORT_SYMBOL_GPL(dpm_suspend_end);
1650
1651 /**
1652  * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
1653  * @dev: Device to suspend.
1654  * @state: PM transition of the system being carried out.
1655  * @cb: Suspend callback to execute.
1656  * @info: string description of caller.
1657  */
1658 static int legacy_suspend(struct device *dev, pm_message_t state,
1659                           int (*cb)(struct device *dev, pm_message_t state),
1660                           const char *info)
1661 {
1662         int error;
1663         ktime_t calltime;
1664
1665         calltime = initcall_debug_start(dev, cb);
1666
1667         trace_device_pm_callback_start(dev, info, state.event);
1668         error = cb(dev, state);
1669         trace_device_pm_callback_end(dev, error);
1670         suspend_report_result(cb, error);
1671
1672         initcall_debug_report(dev, calltime, cb, error);
1673
1674         return error;
1675 }
1676
1677 static void dpm_clear_superiors_direct_complete(struct device *dev)
1678 {
1679         struct device_link *link;
1680         int idx;
1681
1682         if (dev->parent) {
1683                 spin_lock_irq(&dev->parent->power.lock);
1684                 dev->parent->power.direct_complete = false;
1685                 spin_unlock_irq(&dev->parent->power.lock);
1686         }
1687
1688         idx = device_links_read_lock();
1689
1690         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) {
1691                 spin_lock_irq(&link->supplier->power.lock);
1692                 link->supplier->power.direct_complete = false;
1693                 spin_unlock_irq(&link->supplier->power.lock);
1694         }
1695
1696         device_links_read_unlock(idx);
1697 }
1698
1699 /**
1700  * __device_suspend - Execute "suspend" callbacks for given device.
1701  * @dev: Device to handle.
1702  * @state: PM transition of the system being carried out.
1703  * @async: If true, the device is being suspended asynchronously.
1704  */
1705 static int __device_suspend(struct device *dev, pm_message_t state, bool async)
1706 {
1707         pm_callback_t callback = NULL;
1708         const char *info = NULL;
1709         int error = 0;
1710         DECLARE_DPM_WATCHDOG_ON_STACK(wd);
1711
1712         TRACE_DEVICE(dev);
1713         TRACE_SUSPEND(0);
1714
1715         dpm_wait_for_subordinate(dev, async);
1716
1717         if (async_error) {
1718                 dev->power.direct_complete = false;
1719                 goto Complete;
1720         }
1721
1722         /*
1723          * If a device configured to wake up the system from sleep states
1724          * has been suspended at run time and there's a resume request pending
1725          * for it, this is equivalent to the device signaling wakeup, so the
1726          * system suspend operation should be aborted.
1727          */
1728         if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
1729                 pm_wakeup_event(dev, 0);
1730
1731         if (pm_wakeup_pending()) {
1732                 dev->power.direct_complete = false;
1733                 async_error = -EBUSY;
1734                 goto Complete;
1735         }
1736
1737         if (dev->power.syscore)
1738                 goto Complete;
1739
1740         /* Avoid direct_complete to let wakeup_path propagate. */
1741         if (device_may_wakeup(dev) || dev->power.wakeup_path)
1742                 dev->power.direct_complete = false;
1743
1744         if (dev->power.direct_complete) {
1745                 if (pm_runtime_status_suspended(dev)) {
1746                         pm_runtime_disable(dev);
1747                         if (pm_runtime_status_suspended(dev)) {
1748                                 pm_dev_dbg(dev, state, "direct-complete ");
1749                                 goto Complete;
1750                         }
1751
1752                         pm_runtime_enable(dev);
1753                 }
1754                 dev->power.direct_complete = false;
1755         }
1756
1757         dev->power.may_skip_resume = false;
1758         dev->power.must_resume = false;
1759
1760         dpm_watchdog_set(&wd, dev);
1761         device_lock(dev);
1762
1763         if (dev->pm_domain) {
1764                 info = "power domain ";
1765                 callback = pm_op(&dev->pm_domain->ops, state);
1766                 goto Run;
1767         }
1768
1769         if (dev->type && dev->type->pm) {
1770                 info = "type ";
1771                 callback = pm_op(dev->type->pm, state);
1772                 goto Run;
1773         }
1774
1775         if (dev->class && dev->class->pm) {
1776                 info = "class ";
1777                 callback = pm_op(dev->class->pm, state);
1778                 goto Run;
1779         }
1780
1781         if (dev->bus) {
1782                 if (dev->bus->pm) {
1783                         info = "bus ";
1784                         callback = pm_op(dev->bus->pm, state);
1785                 } else if (dev->bus->suspend) {
1786                         pm_dev_dbg(dev, state, "legacy bus ");
1787                         error = legacy_suspend(dev, state, dev->bus->suspend,
1788                                                 "legacy bus ");
1789                         goto End;
1790                 }
1791         }
1792
1793  Run:
1794         if (!callback && dev->driver && dev->driver->pm) {
1795                 info = "driver ";
1796                 callback = pm_op(dev->driver->pm, state);
1797         }
1798
1799         error = dpm_run_callback(callback, dev, state, info);
1800
1801  End:
1802         if (!error) {
1803                 dev->power.is_suspended = true;
1804                 if (device_may_wakeup(dev))
1805                         dev->power.wakeup_path = true;
1806
1807                 dpm_propagate_wakeup_to_parent(dev);
1808                 dpm_clear_superiors_direct_complete(dev);
1809         }
1810
1811         device_unlock(dev);
1812         dpm_watchdog_clear(&wd);
1813
1814  Complete:
1815         if (error)
1816                 async_error = error;
1817
1818         complete_all(&dev->power.completion);
1819         TRACE_SUSPEND(error);
1820         return error;
1821 }
1822
1823 static void async_suspend(void *data, async_cookie_t cookie)
1824 {
1825         struct device *dev = (struct device *)data;
1826         int error;
1827
1828         error = __device_suspend(dev, pm_transition, true);
1829         if (error) {
1830                 dpm_save_failed_dev(dev_name(dev));
1831                 pm_dev_err(dev, pm_transition, " async", error);
1832         }
1833
1834         put_device(dev);
1835 }
1836
1837 static int device_suspend(struct device *dev)
1838 {
1839         if (dpm_async_fn(dev, async_suspend))
1840                 return 0;
1841
1842         return __device_suspend(dev, pm_transition, false);
1843 }
1844
1845 /**
1846  * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
1847  * @state: PM transition of the system being carried out.
1848  */
1849 int dpm_suspend(pm_message_t state)
1850 {
1851         ktime_t starttime = ktime_get();
1852         int error = 0;
1853
1854         trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
1855         might_sleep();
1856
1857         devfreq_suspend();
1858         cpufreq_suspend();
1859
1860         mutex_lock(&dpm_list_mtx);
1861         pm_transition = state;
1862         async_error = 0;
1863         while (!list_empty(&dpm_prepared_list)) {
1864                 struct device *dev = to_device(dpm_prepared_list.prev);
1865
1866                 get_device(dev);
1867                 mutex_unlock(&dpm_list_mtx);
1868
1869                 error = device_suspend(dev);
1870
1871                 mutex_lock(&dpm_list_mtx);
1872                 if (error) {
1873                         pm_dev_err(dev, state, "", error);
1874                         dpm_save_failed_dev(dev_name(dev));
1875                         put_device(dev);
1876                         break;
1877                 }
1878                 if (!list_empty(&dev->power.entry))
1879                         list_move(&dev->power.entry, &dpm_suspended_list);
1880                 put_device(dev);
1881                 if (async_error)
1882                         break;
1883         }
1884         mutex_unlock(&dpm_list_mtx);
1885         async_synchronize_full();
1886         if (!error)
1887                 error = async_error;
1888         if (error) {
1889                 suspend_stats.failed_suspend++;
1890                 dpm_save_failed_step(SUSPEND_SUSPEND);
1891         }
1892         dpm_show_time(starttime, state, error, NULL);
1893         trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
1894         return error;
1895 }
1896
1897 /**
1898  * device_prepare - Prepare a device for system power transition.
1899  * @dev: Device to handle.
1900  * @state: PM transition of the system being carried out.
1901  *
1902  * Execute the ->prepare() callback(s) for given device.  No new children of the
1903  * device may be registered after this function has returned.
1904  */
1905 static int device_prepare(struct device *dev, pm_message_t state)
1906 {
1907         int (*callback)(struct device *) = NULL;
1908         int ret = 0;
1909
1910         if (dev->power.syscore)
1911                 return 0;
1912
1913         WARN_ON(!pm_runtime_enabled(dev) &&
1914                 dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
1915                                               DPM_FLAG_LEAVE_SUSPENDED));
1916
1917         /*
1918          * If a device's parent goes into runtime suspend at the wrong time,
1919          * it won't be possible to resume the device.  To prevent this we
1920          * block runtime suspend here, during the prepare phase, and allow
1921          * it again during the complete phase.
1922          */
1923         pm_runtime_get_noresume(dev);
1924
1925         device_lock(dev);
1926
1927         dev->power.wakeup_path = false;
1928
1929         if (dev->power.no_pm_callbacks)
1930                 goto unlock;
1931
1932         if (dev->pm_domain)
1933                 callback = dev->pm_domain->ops.prepare;
1934         else if (dev->type && dev->type->pm)
1935                 callback = dev->type->pm->prepare;
1936         else if (dev->class && dev->class->pm)
1937                 callback = dev->class->pm->prepare;
1938         else if (dev->bus && dev->bus->pm)
1939                 callback = dev->bus->pm->prepare;
1940
1941         if (!callback && dev->driver && dev->driver->pm)
1942                 callback = dev->driver->pm->prepare;
1943
1944         if (callback)
1945                 ret = callback(dev);
1946
1947 unlock:
1948         device_unlock(dev);
1949
1950         if (ret < 0) {
1951                 suspend_report_result(callback, ret);
1952                 pm_runtime_put(dev);
1953                 return ret;
1954         }
1955         /*
1956          * A positive return value from ->prepare() means "this device appears
1957          * to be runtime-suspended and its state is fine, so if it really is
1958          * runtime-suspended, you can leave it in that state provided that you
1959          * will do the same thing with all of its descendants".  This only
1960          * applies to suspend transitions, however.
1961          */
1962         spin_lock_irq(&dev->power.lock);
1963         dev->power.direct_complete = state.event == PM_EVENT_SUSPEND &&
1964                 ((pm_runtime_suspended(dev) && ret > 0) ||
1965                  dev->power.no_pm_callbacks) &&
1966                 !dev_pm_test_driver_flags(dev, DPM_FLAG_NEVER_SKIP);
1967         spin_unlock_irq(&dev->power.lock);
1968         return 0;
1969 }
1970
1971 /**
1972  * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
1973  * @state: PM transition of the system being carried out.
1974  *
1975  * Execute the ->prepare() callback(s) for all devices.
1976  */
1977 int dpm_prepare(pm_message_t state)
1978 {
1979         int error = 0;
1980
1981         trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
1982         might_sleep();
1983
1984         /*
1985          * Give a chance for the known devices to complete their probes, before
1986          * disable probing of devices. This sync point is important at least
1987          * at boot time + hibernation restore.
1988          */
1989         wait_for_device_probe();
1990         /*
1991          * It is unsafe if probing of devices will happen during suspend or
1992          * hibernation and system behavior will be unpredictable in this case.
1993          * So, let's prohibit device's probing here and defer their probes
1994          * instead. The normal behavior will be restored in dpm_complete().
1995          */
1996         device_block_probing();
1997
1998         mutex_lock(&dpm_list_mtx);
1999         while (!list_empty(&dpm_list)) {
2000                 struct device *dev = to_device(dpm_list.next);
2001
2002                 get_device(dev);
2003                 mutex_unlock(&dpm_list_mtx);
2004
2005                 trace_device_pm_callback_start(dev, "", state.event);
2006                 error = device_prepare(dev, state);
2007                 trace_device_pm_callback_end(dev, error);
2008
2009                 mutex_lock(&dpm_list_mtx);
2010                 if (error) {
2011                         if (error == -EAGAIN) {
2012                                 put_device(dev);
2013                                 error = 0;
2014                                 continue;
2015                         }
2016                         pr_info("Device %s not prepared for power transition: code %d\n",
2017                                 dev_name(dev), error);
2018                         put_device(dev);
2019                         break;
2020                 }
2021                 dev->power.is_prepared = true;
2022                 if (!list_empty(&dev->power.entry))
2023                         list_move_tail(&dev->power.entry, &dpm_prepared_list);
2024                 put_device(dev);
2025         }
2026         mutex_unlock(&dpm_list_mtx);
2027         trace_suspend_resume(TPS("dpm_prepare"), state.event, false);
2028         return error;
2029 }
2030
2031 /**
2032  * dpm_suspend_start - Prepare devices for PM transition and suspend them.
2033  * @state: PM transition of the system being carried out.
2034  *
2035  * Prepare all non-sysdev devices for system PM transition and execute "suspend"
2036  * callbacks for them.
2037  */
2038 int dpm_suspend_start(pm_message_t state)
2039 {
2040         ktime_t starttime = ktime_get();
2041         int error;
2042
2043         error = dpm_prepare(state);
2044         if (error) {
2045                 suspend_stats.failed_prepare++;
2046                 dpm_save_failed_step(SUSPEND_PREPARE);
2047         } else
2048                 error = dpm_suspend(state);
2049         dpm_show_time(starttime, state, error, "start");
2050         return error;
2051 }
2052 EXPORT_SYMBOL_GPL(dpm_suspend_start);
2053
2054 void __suspend_report_result(const char *function, void *fn, int ret)
2055 {
2056         if (ret)
2057                 pr_err("%s(): %pS returns %d\n", function, fn, ret);
2058 }
2059 EXPORT_SYMBOL_GPL(__suspend_report_result);
2060
2061 /**
2062  * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
2063  * @subordinate: Device that needs to wait for @dev.
2064  * @dev: Device to wait for.
2065  */
2066 int device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
2067 {
2068         dpm_wait(dev, subordinate->power.async_suspend);
2069         return async_error;
2070 }
2071 EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
2072
2073 /**
2074  * dpm_for_each_dev - device iterator.
2075  * @data: data for the callback.
2076  * @fn: function to be called for each device.
2077  *
2078  * Iterate over devices in dpm_list, and call @fn for each device,
2079  * passing it @data.
2080  */
2081 void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
2082 {
2083         struct device *dev;
2084
2085         if (!fn)
2086                 return;
2087
2088         device_pm_lock();
2089         list_for_each_entry(dev, &dpm_list, power.entry)
2090                 fn(dev, data);
2091         device_pm_unlock();
2092 }
2093 EXPORT_SYMBOL_GPL(dpm_for_each_dev);
2094
2095 static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
2096 {
2097         if (!ops)
2098                 return true;
2099
2100         return !ops->prepare &&
2101                !ops->suspend &&
2102                !ops->suspend_late &&
2103                !ops->suspend_noirq &&
2104                !ops->resume_noirq &&
2105                !ops->resume_early &&
2106                !ops->resume &&
2107                !ops->complete;
2108 }
2109
2110 void device_pm_check_callbacks(struct device *dev)
2111 {
2112         spin_lock_irq(&dev->power.lock);
2113         dev->power.no_pm_callbacks =
2114                 (!dev->bus || (pm_ops_is_empty(dev->bus->pm) &&
2115                  !dev->bus->suspend && !dev->bus->resume)) &&
2116                 (!dev->class || pm_ops_is_empty(dev->class->pm)) &&
2117                 (!dev->type || pm_ops_is_empty(dev->type->pm)) &&
2118                 (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
2119                 (!dev->driver || (pm_ops_is_empty(dev->driver->pm) &&
2120                  !dev->driver->suspend && !dev->driver->resume));
2121         spin_unlock_irq(&dev->power.lock);
2122 }
2123
2124 bool dev_pm_smart_suspend_and_suspended(struct device *dev)
2125 {
2126         return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
2127                 pm_runtime_status_suspended(dev);
2128 }