LCOV - code coverage report
Current view: top level - drivers/base/power - wakeup.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 115 408 28.2 %
Date: 2022-04-01 14:17:54 Functions: 17 47 36.2 %
Branches: 40 184 21.7 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0
       2                 :            : /*
       3                 :            :  * drivers/base/power/wakeup.c - System wakeup events framework
       4                 :            :  *
       5                 :            :  * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
       6                 :            :  */
       7                 :            : #define pr_fmt(fmt) "PM: " fmt
       8                 :            : 
       9                 :            : #include <linux/device.h>
      10                 :            : #include <linux/slab.h>
      11                 :            : #include <linux/sched/signal.h>
      12                 :            : #include <linux/capability.h>
      13                 :            : #include <linux/export.h>
      14                 :            : #include <linux/suspend.h>
      15                 :            : #include <linux/seq_file.h>
      16                 :            : #include <linux/debugfs.h>
      17                 :            : #include <linux/pm_wakeirq.h>
      18                 :            : #include <trace/events/power.h>
      19                 :            : 
      20                 :            : #include "power.h"
      21                 :            : 
      22                 :            : #ifndef CONFIG_SUSPEND
      23                 :            : suspend_state_t pm_suspend_target_state;
      24                 :            : #define pm_suspend_target_state (PM_SUSPEND_ON)
      25                 :            : #endif
      26                 :            : 
      27                 :            : /*
      28                 :            :  * If set, the suspend/hibernate code will abort transitions to a sleep state
      29                 :            :  * if wakeup events are registered during or immediately before the transition.
      30                 :            :  */
      31                 :            : bool events_check_enabled __read_mostly;
      32                 :            : 
      33                 :            : /* First wakeup IRQ seen by the kernel in the last cycle. */
      34                 :            : unsigned int pm_wakeup_irq __read_mostly;
      35                 :            : 
      36                 :            : /* If greater than 0 and the system is suspending, terminate the suspend. */
      37                 :            : static atomic_t pm_abort_suspend __read_mostly;
      38                 :            : 
      39                 :            : /*
      40                 :            :  * Combined counters of registered wakeup events and wakeup events in progress.
      41                 :            :  * They need to be modified together atomically, so it's better to use one
      42                 :            :  * atomic variable to hold them both.
      43                 :            :  */
      44                 :            : static atomic_t combined_event_count = ATOMIC_INIT(0);
      45                 :            : 
      46                 :            : #define IN_PROGRESS_BITS        (sizeof(int) * 4)
      47                 :            : #define MAX_IN_PROGRESS         ((1 << IN_PROGRESS_BITS) - 1)
      48                 :            : 
      49                 :          0 : static void split_counters(unsigned int *cnt, unsigned int *inpr)
      50                 :            : {
      51                 :          0 :         unsigned int comb = atomic_read(&combined_event_count);
      52                 :            : 
      53                 :          0 :         *cnt = (comb >> IN_PROGRESS_BITS);
      54                 :          0 :         *inpr = comb & MAX_IN_PROGRESS;
      55                 :            : }
      56                 :            : 
      57                 :            : /* A preserved old value of the events counter. */
      58                 :            : static unsigned int saved_count;
      59                 :            : 
      60                 :            : static DEFINE_RAW_SPINLOCK(events_lock);
      61                 :            : 
      62                 :            : static void pm_wakeup_timer_fn(struct timer_list *t);
      63                 :            : 
      64                 :            : static LIST_HEAD(wakeup_sources);
      65                 :            : 
      66                 :            : static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
      67                 :            : 
      68                 :            : DEFINE_STATIC_SRCU(wakeup_srcu);
      69                 :            : 
      70                 :            : static struct wakeup_source deleted_ws = {
      71                 :            :         .name = "deleted",
      72                 :            :         .lock =  __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
      73                 :            : };
      74                 :            : 
      75                 :            : static DEFINE_IDA(wakeup_ida);
      76                 :            : 
      77                 :            : /**
      78                 :            :  * wakeup_source_create - Create a struct wakeup_source object.
      79                 :            :  * @name: Name of the new wakeup source.
      80                 :            :  */
      81                 :        121 : struct wakeup_source *wakeup_source_create(const char *name)
      82                 :            : {
      83                 :        121 :         struct wakeup_source *ws;
      84                 :        121 :         const char *ws_name;
      85                 :        121 :         int id;
      86                 :            : 
      87                 :        121 :         ws = kzalloc(sizeof(*ws), GFP_KERNEL);
      88         [ -  + ]:        121 :         if (!ws)
      89                 :          0 :                 goto err_ws;
      90                 :            : 
      91                 :        121 :         ws_name = kstrdup_const(name, GFP_KERNEL);
      92         [ -  + ]:        121 :         if (!ws_name)
      93                 :          0 :                 goto err_name;
      94                 :        121 :         ws->name = ws_name;
      95                 :            : 
      96                 :        121 :         id = ida_alloc(&wakeup_ida, GFP_KERNEL);
      97         [ -  + ]:        121 :         if (id < 0)
      98                 :          0 :                 goto err_id;
      99                 :        121 :         ws->id = id;
     100                 :            : 
     101                 :        121 :         return ws;
     102                 :            : 
     103                 :            : err_id:
     104                 :          0 :         kfree_const(ws->name);
     105                 :          0 : err_name:
     106                 :          0 :         kfree(ws);
     107                 :            : err_ws:
     108                 :            :         return NULL;
     109                 :            : }
     110                 :            : EXPORT_SYMBOL_GPL(wakeup_source_create);
     111                 :            : 
     112                 :            : /*
     113                 :            :  * Record wakeup_source statistics being deleted into a dummy wakeup_source.
     114                 :            :  */
     115                 :         11 : static void wakeup_source_record(struct wakeup_source *ws)
     116                 :            : {
     117                 :         11 :         unsigned long flags;
     118                 :            : 
     119                 :         11 :         spin_lock_irqsave(&deleted_ws.lock, flags);
     120                 :            : 
     121         [ -  + ]:         11 :         if (ws->event_count) {
     122                 :          0 :                 deleted_ws.total_time =
     123                 :          0 :                         ktime_add(deleted_ws.total_time, ws->total_time);
     124                 :          0 :                 deleted_ws.prevent_sleep_time =
     125                 :          0 :                         ktime_add(deleted_ws.prevent_sleep_time,
     126                 :            :                                   ws->prevent_sleep_time);
     127                 :          0 :                 deleted_ws.max_time =
     128         [ #  # ]:          0 :                         ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
     129                 :            :                                 deleted_ws.max_time : ws->max_time;
     130                 :          0 :                 deleted_ws.event_count += ws->event_count;
     131                 :          0 :                 deleted_ws.active_count += ws->active_count;
     132                 :          0 :                 deleted_ws.relax_count += ws->relax_count;
     133                 :          0 :                 deleted_ws.expire_count += ws->expire_count;
     134                 :          0 :                 deleted_ws.wakeup_count += ws->wakeup_count;
     135                 :            :         }
     136                 :            : 
     137                 :         11 :         spin_unlock_irqrestore(&deleted_ws.lock, flags);
     138                 :         11 : }
     139                 :            : 
     140                 :         11 : static void wakeup_source_free(struct wakeup_source *ws)
     141                 :            : {
     142                 :         11 :         ida_free(&wakeup_ida, ws->id);
     143                 :         11 :         kfree_const(ws->name);
     144                 :         11 :         kfree(ws);
     145                 :         11 : }
     146                 :            : 
     147                 :            : /**
     148                 :            :  * wakeup_source_destroy - Destroy a struct wakeup_source object.
     149                 :            :  * @ws: Wakeup source to destroy.
     150                 :            :  *
     151                 :            :  * Use only for wakeup source objects created with wakeup_source_create().
     152                 :            :  */
     153                 :         11 : void wakeup_source_destroy(struct wakeup_source *ws)
     154                 :            : {
     155         [ +  - ]:         11 :         if (!ws)
     156                 :            :                 return;
     157                 :            : 
     158                 :         11 :         __pm_relax(ws);
     159                 :         11 :         wakeup_source_record(ws);
     160                 :         11 :         wakeup_source_free(ws);
     161                 :            : }
     162                 :            : EXPORT_SYMBOL_GPL(wakeup_source_destroy);
     163                 :            : 
     164                 :            : /**
     165                 :            :  * wakeup_source_add - Add given object to the list of wakeup sources.
     166                 :            :  * @ws: Wakeup source object to add to the list.
     167                 :            :  */
     168                 :        121 : void wakeup_source_add(struct wakeup_source *ws)
     169                 :            : {
     170                 :        121 :         unsigned long flags;
     171                 :            : 
     172   [ -  +  +  - ]:        121 :         if (WARN_ON(!ws))
     173                 :            :                 return;
     174                 :            : 
     175                 :        121 :         spin_lock_init(&ws->lock);
     176                 :        121 :         timer_setup(&ws->timer, pm_wakeup_timer_fn, 0);
     177                 :        121 :         ws->active = false;
     178                 :            : 
     179                 :        121 :         raw_spin_lock_irqsave(&events_lock, flags);
     180                 :        121 :         list_add_rcu(&ws->entry, &wakeup_sources);
     181                 :        121 :         raw_spin_unlock_irqrestore(&events_lock, flags);
     182                 :            : }
     183                 :            : EXPORT_SYMBOL_GPL(wakeup_source_add);
     184                 :            : 
     185                 :            : /**
     186                 :            :  * wakeup_source_remove - Remove given object from the wakeup sources list.
     187                 :            :  * @ws: Wakeup source object to remove from the list.
     188                 :            :  */
     189                 :         11 : void wakeup_source_remove(struct wakeup_source *ws)
     190                 :            : {
     191                 :         11 :         unsigned long flags;
     192                 :            : 
     193   [ -  +  +  - ]:         11 :         if (WARN_ON(!ws))
     194                 :            :                 return;
     195                 :            : 
     196                 :         11 :         raw_spin_lock_irqsave(&events_lock, flags);
     197                 :         11 :         list_del_rcu(&ws->entry);
     198                 :         11 :         raw_spin_unlock_irqrestore(&events_lock, flags);
     199                 :         11 :         synchronize_srcu(&wakeup_srcu);
     200                 :            : 
     201                 :         11 :         del_timer_sync(&ws->timer);
     202                 :            :         /*
     203                 :            :          * Clear timer.function to make wakeup_source_not_registered() treat
     204                 :            :          * this wakeup source as not registered.
     205                 :            :          */
     206                 :         11 :         ws->timer.function = NULL;
     207                 :            : }
     208                 :            : EXPORT_SYMBOL_GPL(wakeup_source_remove);
     209                 :            : 
     210                 :            : /**
     211                 :            :  * wakeup_source_register - Create wakeup source and add it to the list.
     212                 :            :  * @dev: Device this wakeup source is associated with (or NULL if virtual).
     213                 :            :  * @name: Name of the wakeup source to register.
     214                 :            :  */
     215                 :        121 : struct wakeup_source *wakeup_source_register(struct device *dev,
     216                 :            :                                              const char *name)
     217                 :            : {
     218                 :        121 :         struct wakeup_source *ws;
     219                 :        121 :         int ret;
     220                 :            : 
     221                 :        121 :         ws = wakeup_source_create(name);
     222         [ +  - ]:        121 :         if (ws) {
     223   [ +  -  +  - ]:        121 :                 if (!dev || device_is_registered(dev)) {
     224                 :        121 :                         ret = wakeup_source_sysfs_add(dev, ws);
     225         [ -  + ]:        121 :                         if (ret) {
     226                 :          0 :                                 wakeup_source_free(ws);
     227                 :          0 :                                 return NULL;
     228                 :            :                         }
     229                 :            :                 }
     230                 :        121 :                 wakeup_source_add(ws);
     231                 :            :         }
     232                 :            :         return ws;
     233                 :            : }
     234                 :            : EXPORT_SYMBOL_GPL(wakeup_source_register);
     235                 :            : 
     236                 :            : /**
     237                 :            :  * wakeup_source_unregister - Remove wakeup source from the list and remove it.
     238                 :            :  * @ws: Wakeup source object to unregister.
     239                 :            :  */
     240                 :       1386 : void wakeup_source_unregister(struct wakeup_source *ws)
     241                 :            : {
     242         [ +  + ]:       1386 :         if (ws) {
     243                 :         11 :                 wakeup_source_remove(ws);
     244                 :         11 :                 wakeup_source_sysfs_remove(ws);
     245                 :         11 :                 wakeup_source_destroy(ws);
     246                 :            :         }
     247                 :       1386 : }
     248                 :            : EXPORT_SYMBOL_GPL(wakeup_source_unregister);
     249                 :            : 
     250                 :            : /**
     251                 :            :  * wakeup_sources_read_lock - Lock wakeup source list for read.
     252                 :            :  *
     253                 :            :  * Returns an index of srcu lock for struct wakeup_srcu.
     254                 :            :  * This index must be passed to the matching wakeup_sources_read_unlock().
     255                 :            :  */
     256                 :          0 : int wakeup_sources_read_lock(void)
     257                 :            : {
     258                 :          0 :         return srcu_read_lock(&wakeup_srcu);
     259                 :            : }
     260                 :            : EXPORT_SYMBOL_GPL(wakeup_sources_read_lock);
     261                 :            : 
     262                 :            : /**
     263                 :            :  * wakeup_sources_read_unlock - Unlock wakeup source list.
     264                 :            :  * @idx: return value from corresponding wakeup_sources_read_lock()
     265                 :            :  */
     266                 :          0 : void wakeup_sources_read_unlock(int idx)
     267                 :            : {
     268                 :          0 :         srcu_read_unlock(&wakeup_srcu, idx);
     269                 :          0 : }
     270                 :            : EXPORT_SYMBOL_GPL(wakeup_sources_read_unlock);
     271                 :            : 
     272                 :            : /**
     273                 :            :  * wakeup_sources_walk_start - Begin a walk on wakeup source list
     274                 :            :  *
     275                 :            :  * Returns first object of the list of wakeup sources.
     276                 :            :  *
     277                 :            :  * Note that to be safe, wakeup sources list needs to be locked by calling
     278                 :            :  * wakeup_source_read_lock() for this.
     279                 :            :  */
     280                 :          0 : struct wakeup_source *wakeup_sources_walk_start(void)
     281                 :            : {
     282                 :          0 :         struct list_head *ws_head = &wakeup_sources;
     283                 :            : 
     284                 :          0 :         return list_entry_rcu(ws_head->next, struct wakeup_source, entry);
     285                 :            : }
     286                 :            : EXPORT_SYMBOL_GPL(wakeup_sources_walk_start);
     287                 :            : 
     288                 :            : /**
     289                 :            :  * wakeup_sources_walk_next - Get next wakeup source from the list
     290                 :            :  * @ws: Previous wakeup source object
     291                 :            :  *
     292                 :            :  * Note that to be safe, wakeup sources list needs to be locked by calling
     293                 :            :  * wakeup_source_read_lock() for this.
     294                 :            :  */
     295                 :          0 : struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws)
     296                 :            : {
     297                 :          0 :         struct list_head *ws_head = &wakeup_sources;
     298                 :            : 
     299         [ #  # ]:          0 :         return list_next_or_null_rcu(ws_head, &ws->entry,
     300                 :            :                                 struct wakeup_source, entry);
     301                 :            : }
     302                 :            : EXPORT_SYMBOL_GPL(wakeup_sources_walk_next);
     303                 :            : 
     304                 :            : /**
     305                 :            :  * device_wakeup_attach - Attach a wakeup source object to a device object.
     306                 :            :  * @dev: Device to handle.
     307                 :            :  * @ws: Wakeup source object to attach to @dev.
     308                 :            :  *
     309                 :            :  * This causes @dev to be treated as a wakeup device.
     310                 :            :  */
     311                 :         44 : static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
     312                 :            : {
     313                 :         44 :         spin_lock_irq(&dev->power.lock);
     314         [ +  + ]:         44 :         if (dev->power.wakeup) {
     315                 :         11 :                 spin_unlock_irq(&dev->power.lock);
     316                 :         11 :                 return -EEXIST;
     317                 :            :         }
     318                 :         33 :         dev->power.wakeup = ws;
     319         [ -  + ]:         33 :         if (dev->power.wakeirq)
     320                 :          0 :                 device_wakeup_attach_irq(dev, dev->power.wakeirq);
     321                 :         33 :         spin_unlock_irq(&dev->power.lock);
     322                 :         33 :         return 0;
     323                 :            : }
     324                 :            : 
     325                 :            : /**
     326                 :            :  * device_wakeup_enable - Enable given device to be a wakeup source.
     327                 :            :  * @dev: Device to handle.
     328                 :            :  *
     329                 :            :  * Create a wakeup source object, register it and attach it to @dev.
     330                 :            :  */
     331                 :         55 : int device_wakeup_enable(struct device *dev)
     332                 :            : {
     333                 :         55 :         struct wakeup_source *ws;
     334                 :         55 :         int ret;
     335                 :            : 
     336   [ +  -  +  + ]:         55 :         if (!dev || !dev->power.can_wakeup)
     337                 :            :                 return -EINVAL;
     338                 :            : 
     339                 :         44 :         if (pm_suspend_target_state != PM_SUSPEND_ON)
     340                 :            :                 dev_dbg(dev, "Suspicious %s() during system transition!\n", __func__);
     341                 :            : 
     342         [ +  - ]:         88 :         ws = wakeup_source_register(dev, dev_name(dev));
     343         [ +  - ]:         44 :         if (!ws)
     344                 :            :                 return -ENOMEM;
     345                 :            : 
     346                 :         44 :         ret = device_wakeup_attach(dev, ws);
     347         [ +  + ]:         44 :         if (ret)
     348                 :         11 :                 wakeup_source_unregister(ws);
     349                 :            : 
     350                 :            :         return ret;
     351                 :            : }
     352                 :            : EXPORT_SYMBOL_GPL(device_wakeup_enable);
     353                 :            : 
     354                 :            : /**
     355                 :            :  * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
     356                 :            :  * @dev: Device to handle
     357                 :            :  * @wakeirq: Device specific wakeirq entry
     358                 :            :  *
     359                 :            :  * Attach a device wakeirq to the wakeup source so the device
     360                 :            :  * wake IRQ can be configured automatically for suspend and
     361                 :            :  * resume.
     362                 :            :  *
     363                 :            :  * Call under the device's power.lock lock.
     364                 :            :  */
     365                 :          0 : void device_wakeup_attach_irq(struct device *dev,
     366                 :            :                              struct wake_irq *wakeirq)
     367                 :            : {
     368                 :          0 :         struct wakeup_source *ws;
     369                 :            : 
     370                 :          0 :         ws = dev->power.wakeup;
     371   [ #  #  #  # ]:          0 :         if (!ws)
     372                 :            :                 return;
     373                 :            : 
     374   [ #  #  #  # ]:          0 :         if (ws->wakeirq)
     375                 :          0 :                 dev_err(dev, "Leftover wakeup IRQ found, overriding\n");
     376                 :            : 
     377                 :          0 :         ws->wakeirq = wakeirq;
     378                 :            : }
     379                 :            : 
     380                 :            : /**
     381                 :            :  * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
     382                 :            :  * @dev: Device to handle
     383                 :            :  *
     384                 :            :  * Removes a device wakeirq from the wakeup source.
     385                 :            :  *
     386                 :            :  * Call under the device's power.lock lock.
     387                 :            :  */
     388                 :          0 : void device_wakeup_detach_irq(struct device *dev)
     389                 :            : {
     390                 :          0 :         struct wakeup_source *ws;
     391                 :            : 
     392                 :          0 :         ws = dev->power.wakeup;
     393         [ #  # ]:          0 :         if (ws)
     394                 :          0 :                 ws->wakeirq = NULL;
     395                 :          0 : }
     396                 :            : 
     397                 :            : /**
     398                 :            :  * device_wakeup_arm_wake_irqs(void)
     399                 :            :  *
     400                 :            :  * Itereates over the list of device wakeirqs to arm them.
     401                 :            :  */
     402                 :          0 : void device_wakeup_arm_wake_irqs(void)
     403                 :            : {
     404                 :          0 :         struct wakeup_source *ws;
     405                 :          0 :         int srcuidx;
     406                 :            : 
     407                 :          0 :         srcuidx = srcu_read_lock(&wakeup_srcu);
     408         [ #  # ]:          0 :         list_for_each_entry_rcu(ws, &wakeup_sources, entry)
     409                 :          0 :                 dev_pm_arm_wake_irq(ws->wakeirq);
     410                 :          0 :         srcu_read_unlock(&wakeup_srcu, srcuidx);
     411                 :          0 : }
     412                 :            : 
     413                 :            : /**
     414                 :            :  * device_wakeup_disarm_wake_irqs(void)
     415                 :            :  *
     416                 :            :  * Itereates over the list of device wakeirqs to disarm them.
     417                 :            :  */
     418                 :          0 : void device_wakeup_disarm_wake_irqs(void)
     419                 :            : {
     420                 :          0 :         struct wakeup_source *ws;
     421                 :          0 :         int srcuidx;
     422                 :            : 
     423                 :          0 :         srcuidx = srcu_read_lock(&wakeup_srcu);
     424         [ #  # ]:          0 :         list_for_each_entry_rcu(ws, &wakeup_sources, entry)
     425                 :          0 :                 dev_pm_disarm_wake_irq(ws->wakeirq);
     426                 :          0 :         srcu_read_unlock(&wakeup_srcu, srcuidx);
     427                 :          0 : }
     428                 :            : 
     429                 :            : /**
     430                 :            :  * device_wakeup_detach - Detach a device's wakeup source object from it.
     431                 :            :  * @dev: Device to detach the wakeup source object from.
     432                 :            :  *
     433                 :            :  * After it returns, @dev will not be treated as a wakeup device any more.
     434                 :            :  */
     435                 :          0 : static struct wakeup_source *device_wakeup_detach(struct device *dev)
     436                 :            : {
     437                 :          0 :         struct wakeup_source *ws;
     438                 :            : 
     439                 :          0 :         spin_lock_irq(&dev->power.lock);
     440                 :          0 :         ws = dev->power.wakeup;
     441                 :          0 :         dev->power.wakeup = NULL;
     442                 :          0 :         spin_unlock_irq(&dev->power.lock);
     443                 :          0 :         return ws;
     444                 :            : }
     445                 :            : 
     446                 :            : /**
     447                 :            :  * device_wakeup_disable - Do not regard a device as a wakeup source any more.
     448                 :            :  * @dev: Device to handle.
     449                 :            :  *
     450                 :            :  * Detach the @dev's wakeup source object from it, unregister this wakeup source
     451                 :            :  * object and destroy it.
     452                 :            :  */
     453                 :          0 : int device_wakeup_disable(struct device *dev)
     454                 :            : {
     455                 :          0 :         struct wakeup_source *ws;
     456                 :            : 
     457   [ #  #  #  # ]:          0 :         if (!dev || !dev->power.can_wakeup)
     458                 :            :                 return -EINVAL;
     459                 :            : 
     460                 :          0 :         ws = device_wakeup_detach(dev);
     461                 :          0 :         wakeup_source_unregister(ws);
     462                 :          0 :         return 0;
     463                 :            : }
     464                 :            : EXPORT_SYMBOL_GPL(device_wakeup_disable);
     465                 :            : 
     466                 :            : /**
     467                 :            :  * device_set_wakeup_capable - Set/reset device wakeup capability flag.
     468                 :            :  * @dev: Device to handle.
     469                 :            :  * @capable: Whether or not @dev is capable of waking up the system from sleep.
     470                 :            :  *
     471                 :            :  * If @capable is set, set the @dev's power.can_wakeup flag and add its
     472                 :            :  * wakeup-related attributes to sysfs.  Otherwise, unset the @dev's
     473                 :            :  * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
     474                 :            :  *
     475                 :            :  * This function may sleep and it can't be called from any context where
     476                 :            :  * sleeping is not allowed.
     477                 :            :  */
     478                 :        187 : void device_set_wakeup_capable(struct device *dev, bool capable)
     479                 :            : {
     480         [ +  + ]:        187 :         if (!!dev->power.can_wakeup == !!capable)
     481                 :            :                 return;
     482                 :            : 
     483                 :         99 :         dev->power.can_wakeup = capable;
     484   [ +  +  +  - ]:         99 :         if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
     485         [ +  - ]:         77 :                 if (capable) {
     486                 :         77 :                         int ret = wakeup_sysfs_add(dev);
     487                 :            : 
     488         [ -  + ]:         77 :                         if (ret)
     489                 :          0 :                                 dev_info(dev, "Wakeup sysfs attributes not added\n");
     490                 :            :                 } else {
     491                 :          0 :                         wakeup_sysfs_remove(dev);
     492                 :            :                 }
     493                 :            :         }
     494                 :            : }
     495                 :            : EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
     496                 :            : 
     497                 :            : /**
     498                 :            :  * device_init_wakeup - Device wakeup initialization.
     499                 :            :  * @dev: Device to handle.
     500                 :            :  * @enable: Whether or not to enable @dev as a wakeup device.
     501                 :            :  *
     502                 :            :  * By default, most devices should leave wakeup disabled.  The exceptions are
     503                 :            :  * devices that everyone expects to be wakeup sources: keyboards, power buttons,
     504                 :            :  * possibly network interfaces, etc.  Also, devices that don't generate their
     505                 :            :  * own wakeup requests but merely forward requests from one bus to another
     506                 :            :  * (like PCI bridges) should have wakeup enabled by default.
     507                 :            :  */
     508                 :         44 : int device_init_wakeup(struct device *dev, bool enable)
     509                 :            : {
     510                 :         44 :         int ret = 0;
     511                 :            : 
     512         [ +  - ]:         44 :         if (!dev)
     513                 :            :                 return -EINVAL;
     514                 :            : 
     515         [ +  - ]:         44 :         if (enable) {
     516                 :         44 :                 device_set_wakeup_capable(dev, true);
     517                 :         44 :                 ret = device_wakeup_enable(dev);
     518                 :            :         } else {
     519                 :          0 :                 device_wakeup_disable(dev);
     520                 :          0 :                 device_set_wakeup_capable(dev, false);
     521                 :            :         }
     522                 :            : 
     523                 :            :         return ret;
     524                 :            : }
     525                 :            : EXPORT_SYMBOL_GPL(device_init_wakeup);
     526                 :            : 
     527                 :            : /**
     528                 :            :  * device_set_wakeup_enable - Enable or disable a device to wake up the system.
     529                 :            :  * @dev: Device to handle.
     530                 :            :  */
     531                 :         11 : int device_set_wakeup_enable(struct device *dev, bool enable)
     532                 :            : {
     533         [ +  - ]:         11 :         return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
     534                 :            : }
     535                 :            : EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
     536                 :            : 
     537                 :            : /**
     538                 :            :  * wakeup_source_not_registered - validate the given wakeup source.
     539                 :            :  * @ws: Wakeup source to be validated.
     540                 :            :  */
     541                 :          0 : static bool wakeup_source_not_registered(struct wakeup_source *ws)
     542                 :            : {
     543                 :            :         /*
     544                 :            :          * Use timer struct to check if the given source is initialized
     545                 :            :          * by wakeup_source_add.
     546                 :            :          */
     547                 :          0 :         return ws->timer.function != pm_wakeup_timer_fn;
     548                 :            : }
     549                 :            : 
     550                 :            : /*
     551                 :            :  * The functions below use the observation that each wakeup event starts a
     552                 :            :  * period in which the system should not be suspended.  The moment this period
     553                 :            :  * will end depends on how the wakeup event is going to be processed after being
     554                 :            :  * detected and all of the possible cases can be divided into two distinct
     555                 :            :  * groups.
     556                 :            :  *
     557                 :            :  * First, a wakeup event may be detected by the same functional unit that will
     558                 :            :  * carry out the entire processing of it and possibly will pass it to user space
     559                 :            :  * for further processing.  In that case the functional unit that has detected
     560                 :            :  * the event may later "close" the "no suspend" period associated with it
     561                 :            :  * directly as soon as it has been dealt with.  The pair of pm_stay_awake() and
     562                 :            :  * pm_relax(), balanced with each other, is supposed to be used in such
     563                 :            :  * situations.
     564                 :            :  *
     565                 :            :  * Second, a wakeup event may be detected by one functional unit and processed
     566                 :            :  * by another one.  In that case the unit that has detected it cannot really
     567                 :            :  * "close" the "no suspend" period associated with it, unless it knows in
     568                 :            :  * advance what's going to happen to the event during processing.  This
     569                 :            :  * knowledge, however, may not be available to it, so it can simply specify time
     570                 :            :  * to wait before the system can be suspended and pass it as the second
     571                 :            :  * argument of pm_wakeup_event().
     572                 :            :  *
     573                 :            :  * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
     574                 :            :  * "no suspend" period will be ended either by the pm_relax(), or by the timer
     575                 :            :  * function executed when the timer expires, whichever comes first.
     576                 :            :  */
     577                 :            : 
     578                 :            : /**
     579                 :            :  * wakup_source_activate - Mark given wakeup source as active.
     580                 :            :  * @ws: Wakeup source to handle.
     581                 :            :  *
     582                 :            :  * Update the @ws' statistics and, if @ws has just been activated, notify the PM
     583                 :            :  * core of the event by incrementing the counter of of wakeup events being
     584                 :            :  * processed.
     585                 :            :  */
     586                 :          0 : static void wakeup_source_activate(struct wakeup_source *ws)
     587                 :            : {
     588                 :          0 :         unsigned int cec;
     589                 :            : 
     590   [ #  #  #  #  :          0 :         if (WARN_ONCE(wakeup_source_not_registered(ws),
                   #  # ]
     591                 :            :                         "unregistered wakeup source\n"))
     592                 :            :                 return;
     593                 :            : 
     594                 :          0 :         ws->active = true;
     595                 :          0 :         ws->active_count++;
     596                 :          0 :         ws->last_time = ktime_get();
     597         [ #  # ]:          0 :         if (ws->autosleep_enabled)
     598                 :          0 :                 ws->start_prevent_time = ws->last_time;
     599                 :            : 
     600                 :            :         /* Increment the counter of events in progress. */
     601                 :          0 :         cec = atomic_inc_return(&combined_event_count);
     602                 :            : 
     603                 :          0 :         trace_wakeup_source_activate(ws->name, cec);
     604                 :            : }
     605                 :            : 
     606                 :            : /**
     607                 :            :  * wakeup_source_report_event - Report wakeup event using the given source.
     608                 :            :  * @ws: Wakeup source to report the event for.
     609                 :            :  * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
     610                 :            :  */
     611                 :          0 : static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
     612                 :            : {
     613                 :          0 :         ws->event_count++;
     614                 :            :         /* This is racy, but the counter is approximate anyway. */
     615         [ #  # ]:          0 :         if (events_check_enabled)
     616                 :          0 :                 ws->wakeup_count++;
     617                 :            : 
     618         [ #  # ]:          0 :         if (!ws->active)
     619                 :          0 :                 wakeup_source_activate(ws);
     620                 :            : 
     621         [ #  # ]:          0 :         if (hard)
     622                 :          0 :                 pm_system_wakeup();
     623                 :          0 : }
     624                 :            : 
     625                 :            : /**
     626                 :            :  * __pm_stay_awake - Notify the PM core of a wakeup event.
     627                 :            :  * @ws: Wakeup source object associated with the source of the event.
     628                 :            :  *
     629                 :            :  * It is safe to call this function from interrupt context.
     630                 :            :  */
     631                 :          0 : void __pm_stay_awake(struct wakeup_source *ws)
     632                 :            : {
     633                 :          0 :         unsigned long flags;
     634                 :            : 
     635         [ #  # ]:          0 :         if (!ws)
     636                 :            :                 return;
     637                 :            : 
     638                 :          0 :         spin_lock_irqsave(&ws->lock, flags);
     639                 :            : 
     640                 :          0 :         wakeup_source_report_event(ws, false);
     641                 :          0 :         del_timer(&ws->timer);
     642                 :          0 :         ws->timer_expires = 0;
     643                 :            : 
     644                 :          0 :         spin_unlock_irqrestore(&ws->lock, flags);
     645                 :            : }
     646                 :            : EXPORT_SYMBOL_GPL(__pm_stay_awake);
     647                 :            : 
     648                 :            : /**
     649                 :            :  * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
     650                 :            :  * @dev: Device the wakeup event is related to.
     651                 :            :  *
     652                 :            :  * Notify the PM core of a wakeup event (signaled by @dev) by calling
     653                 :            :  * __pm_stay_awake for the @dev's wakeup source object.
     654                 :            :  *
     655                 :            :  * Call this function after detecting of a wakeup event if pm_relax() is going
     656                 :            :  * to be called directly after processing the event (and possibly passing it to
     657                 :            :  * user space for further processing).
     658                 :            :  */
     659                 :          0 : void pm_stay_awake(struct device *dev)
     660                 :            : {
     661                 :          0 :         unsigned long flags;
     662                 :            : 
     663         [ #  # ]:          0 :         if (!dev)
     664                 :            :                 return;
     665                 :            : 
     666                 :          0 :         spin_lock_irqsave(&dev->power.lock, flags);
     667                 :          0 :         __pm_stay_awake(dev->power.wakeup);
     668                 :          0 :         spin_unlock_irqrestore(&dev->power.lock, flags);
     669                 :            : }
     670                 :            : EXPORT_SYMBOL_GPL(pm_stay_awake);
     671                 :            : 
     672                 :            : #ifdef CONFIG_PM_AUTOSLEEP
     673                 :            : static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
     674                 :            : {
     675                 :            :         ktime_t delta = ktime_sub(now, ws->start_prevent_time);
     676                 :            :         ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
     677                 :            : }
     678                 :            : #else
     679                 :            : static inline void update_prevent_sleep_time(struct wakeup_source *ws,
     680                 :            :                                              ktime_t now) {}
     681                 :            : #endif
     682                 :            : 
     683                 :            : /**
     684                 :            :  * wakup_source_deactivate - Mark given wakeup source as inactive.
     685                 :            :  * @ws: Wakeup source to handle.
     686                 :            :  *
     687                 :            :  * Update the @ws' statistics and notify the PM core that the wakeup source has
     688                 :            :  * become inactive by decrementing the counter of wakeup events being processed
     689                 :            :  * and incrementing the counter of registered wakeup events.
     690                 :            :  */
     691                 :          0 : static void wakeup_source_deactivate(struct wakeup_source *ws)
     692                 :            : {
     693                 :          0 :         unsigned int cnt, inpr, cec;
     694                 :          0 :         ktime_t duration;
     695                 :          0 :         ktime_t now;
     696                 :            : 
     697                 :          0 :         ws->relax_count++;
     698                 :            :         /*
     699                 :            :          * __pm_relax() may be called directly or from a timer function.
     700                 :            :          * If it is called directly right after the timer function has been
     701                 :            :          * started, but before the timer function calls __pm_relax(), it is
     702                 :            :          * possible that __pm_stay_awake() will be called in the meantime and
     703                 :            :          * will set ws->active.  Then, ws->active may be cleared immediately
     704                 :            :          * by the __pm_relax() called from the timer function, but in such a
     705                 :            :          * case ws->relax_count will be different from ws->active_count.
     706                 :            :          */
     707         [ #  # ]:          0 :         if (ws->relax_count != ws->active_count) {
     708                 :          0 :                 ws->relax_count--;
     709                 :          0 :                 return;
     710                 :            :         }
     711                 :            : 
     712                 :          0 :         ws->active = false;
     713                 :            : 
     714                 :          0 :         now = ktime_get();
     715                 :          0 :         duration = ktime_sub(now, ws->last_time);
     716                 :          0 :         ws->total_time = ktime_add(ws->total_time, duration);
     717         [ #  # ]:          0 :         if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
     718                 :          0 :                 ws->max_time = duration;
     719                 :            : 
     720                 :          0 :         ws->last_time = now;
     721                 :          0 :         del_timer(&ws->timer);
     722                 :          0 :         ws->timer_expires = 0;
     723                 :            : 
     724                 :          0 :         if (ws->autosleep_enabled)
     725                 :            :                 update_prevent_sleep_time(ws, now);
     726                 :            : 
     727                 :            :         /*
     728                 :            :          * Increment the counter of registered wakeup events and decrement the
     729                 :            :          * couter of wakeup events in progress simultaneously.
     730                 :            :          */
     731                 :          0 :         cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
     732                 :          0 :         trace_wakeup_source_deactivate(ws->name, cec);
     733                 :            : 
     734                 :          0 :         split_counters(&cnt, &inpr);
     735   [ #  #  #  # ]:          0 :         if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
     736                 :          0 :                 wake_up(&wakeup_count_wait_queue);
     737                 :            : }
     738                 :            : 
     739                 :            : /**
     740                 :            :  * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
     741                 :            :  * @ws: Wakeup source object associated with the source of the event.
     742                 :            :  *
     743                 :            :  * Call this function for wakeup events whose processing started with calling
     744                 :            :  * __pm_stay_awake().
     745                 :            :  *
     746                 :            :  * It is safe to call it from interrupt context.
     747                 :            :  */
     748                 :      97636 : void __pm_relax(struct wakeup_source *ws)
     749                 :            : {
     750                 :      97636 :         unsigned long flags;
     751                 :            : 
     752         [ +  + ]:      97636 :         if (!ws)
     753                 :            :                 return;
     754                 :            : 
     755                 :         11 :         spin_lock_irqsave(&ws->lock, flags);
     756         [ -  + ]:         11 :         if (ws->active)
     757                 :          0 :                 wakeup_source_deactivate(ws);
     758                 :         11 :         spin_unlock_irqrestore(&ws->lock, flags);
     759                 :            : }
     760                 :            : EXPORT_SYMBOL_GPL(__pm_relax);
     761                 :            : 
     762                 :            : /**
     763                 :            :  * pm_relax - Notify the PM core that processing of a wakeup event has ended.
     764                 :            :  * @dev: Device that signaled the event.
     765                 :            :  *
     766                 :            :  * Execute __pm_relax() for the @dev's wakeup source object.
     767                 :            :  */
     768                 :          0 : void pm_relax(struct device *dev)
     769                 :            : {
     770                 :          0 :         unsigned long flags;
     771                 :            : 
     772         [ #  # ]:          0 :         if (!dev)
     773                 :            :                 return;
     774                 :            : 
     775                 :          0 :         spin_lock_irqsave(&dev->power.lock, flags);
     776                 :          0 :         __pm_relax(dev->power.wakeup);
     777                 :          0 :         spin_unlock_irqrestore(&dev->power.lock, flags);
     778                 :            : }
     779                 :            : EXPORT_SYMBOL_GPL(pm_relax);
     780                 :            : 
     781                 :            : /**
     782                 :            :  * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
     783                 :            :  * @data: Address of the wakeup source object associated with the event source.
     784                 :            :  *
     785                 :            :  * Call wakeup_source_deactivate() for the wakeup source whose address is stored
     786                 :            :  * in @data if it is currently active and its timer has not been canceled and
     787                 :            :  * the expiration time of the timer is not in future.
     788                 :            :  */
     789                 :          0 : static void pm_wakeup_timer_fn(struct timer_list *t)
     790                 :            : {
     791                 :          0 :         struct wakeup_source *ws = from_timer(ws, t, timer);
     792                 :          0 :         unsigned long flags;
     793                 :            : 
     794                 :          0 :         spin_lock_irqsave(&ws->lock, flags);
     795                 :            : 
     796   [ #  #  #  # ]:          0 :         if (ws->active && ws->timer_expires
     797         [ #  # ]:          0 :             && time_after_eq(jiffies, ws->timer_expires)) {
     798                 :          0 :                 wakeup_source_deactivate(ws);
     799                 :          0 :                 ws->expire_count++;
     800                 :            :         }
     801                 :            : 
     802                 :          0 :         spin_unlock_irqrestore(&ws->lock, flags);
     803                 :          0 : }
     804                 :            : 
     805                 :            : /**
     806                 :            :  * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
     807                 :            :  * @ws: Wakeup source object associated with the event source.
     808                 :            :  * @msec: Anticipated event processing time (in milliseconds).
     809                 :            :  * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
     810                 :            :  *
     811                 :            :  * Notify the PM core of a wakeup event whose source is @ws that will take
     812                 :            :  * approximately @msec milliseconds to be processed by the kernel.  If @ws is
     813                 :            :  * not active, activate it.  If @msec is nonzero, set up the @ws' timer to
     814                 :            :  * execute pm_wakeup_timer_fn() in future.
     815                 :            :  *
     816                 :            :  * It is safe to call this function from interrupt context.
     817                 :            :  */
     818                 :         33 : void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
     819                 :            : {
     820                 :         33 :         unsigned long flags;
     821                 :         33 :         unsigned long expires;
     822                 :            : 
     823         [ -  + ]:         33 :         if (!ws)
     824                 :            :                 return;
     825                 :            : 
     826                 :          0 :         spin_lock_irqsave(&ws->lock, flags);
     827                 :            : 
     828                 :          0 :         wakeup_source_report_event(ws, hard);
     829                 :            : 
     830         [ #  # ]:          0 :         if (!msec) {
     831                 :          0 :                 wakeup_source_deactivate(ws);
     832                 :          0 :                 goto unlock;
     833                 :            :         }
     834                 :            : 
     835         [ #  # ]:          0 :         expires = jiffies + msecs_to_jiffies(msec);
     836                 :          0 :         if (!expires)
     837                 :            :                 expires = 1;
     838                 :            : 
     839   [ #  #  #  # ]:          0 :         if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
     840                 :          0 :                 mod_timer(&ws->timer, expires);
     841                 :          0 :                 ws->timer_expires = expires;
     842                 :            :         }
     843                 :            : 
     844                 :          0 :  unlock:
     845                 :          0 :         spin_unlock_irqrestore(&ws->lock, flags);
     846                 :            : }
     847                 :            : EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);
     848                 :            : 
     849                 :            : /**
     850                 :            :  * pm_wakeup_dev_event - Notify the PM core of a wakeup event.
     851                 :            :  * @dev: Device the wakeup event is related to.
     852                 :            :  * @msec: Anticipated event processing time (in milliseconds).
     853                 :            :  * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
     854                 :            :  *
     855                 :            :  * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
     856                 :            :  */
     857                 :         33 : void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
     858                 :            : {
     859                 :         33 :         unsigned long flags;
     860                 :            : 
     861         [ +  - ]:         33 :         if (!dev)
     862                 :            :                 return;
     863                 :            : 
     864                 :         33 :         spin_lock_irqsave(&dev->power.lock, flags);
     865                 :         33 :         pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
     866                 :         33 :         spin_unlock_irqrestore(&dev->power.lock, flags);
     867                 :            : }
     868                 :            : EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
     869                 :            : 
     870                 :          0 : void pm_print_active_wakeup_sources(void)
     871                 :            : {
     872                 :          0 :         struct wakeup_source *ws;
     873                 :          0 :         int srcuidx, active = 0;
     874                 :          0 :         struct wakeup_source *last_activity_ws = NULL;
     875                 :            : 
     876                 :          0 :         srcuidx = srcu_read_lock(&wakeup_srcu);
     877         [ #  # ]:          0 :         list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
     878         [ #  # ]:          0 :                 if (ws->active) {
     879                 :          0 :                         pm_pr_dbg("active wakeup source: %s\n", ws->name);
     880                 :          0 :                         active = 1;
     881   [ #  #  #  # ]:          0 :                 } else if (!active &&
     882                 :          0 :                            (!last_activity_ws ||
     883         [ #  # ]:          0 :                             ktime_to_ns(ws->last_time) >
     884         [ #  # ]:          0 :                             ktime_to_ns(last_activity_ws->last_time))) {
     885                 :            :                         last_activity_ws = ws;
     886                 :            :                 }
     887                 :            :         }
     888                 :            : 
     889         [ #  # ]:          0 :         if (!active && last_activity_ws)
     890                 :          0 :                 pm_pr_dbg("last active wakeup source: %s\n",
     891                 :            :                         last_activity_ws->name);
     892                 :          0 :         srcu_read_unlock(&wakeup_srcu, srcuidx);
     893                 :          0 : }
     894                 :            : EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
     895                 :            : 
     896                 :            : /**
     897                 :            :  * pm_wakeup_pending - Check if power transition in progress should be aborted.
     898                 :            :  *
     899                 :            :  * Compare the current number of registered wakeup events with its preserved
     900                 :            :  * value from the past and return true if new wakeup events have been registered
     901                 :            :  * since the old value was stored.  Also return true if the current number of
     902                 :            :  * wakeup events being processed is different from zero.
     903                 :            :  */
     904                 :          0 : bool pm_wakeup_pending(void)
     905                 :            : {
     906                 :          0 :         unsigned long flags;
     907                 :          0 :         bool ret = false;
     908                 :            : 
     909                 :          0 :         raw_spin_lock_irqsave(&events_lock, flags);
     910         [ #  # ]:          0 :         if (events_check_enabled) {
     911                 :          0 :                 unsigned int cnt, inpr;
     912                 :            : 
     913                 :          0 :                 split_counters(&cnt, &inpr);
     914   [ #  #  #  # ]:          0 :                 ret = (cnt != saved_count || inpr > 0);
     915                 :          0 :                 events_check_enabled = !ret;
     916                 :            :         }
     917                 :          0 :         raw_spin_unlock_irqrestore(&events_lock, flags);
     918                 :            : 
     919         [ #  # ]:          0 :         if (ret) {
     920                 :          0 :                 pm_pr_dbg("Wakeup pending, aborting suspend\n");
     921                 :          0 :                 pm_print_active_wakeup_sources();
     922                 :            :         }
     923                 :            : 
     924   [ #  #  #  # ]:          0 :         return ret || atomic_read(&pm_abort_suspend) > 0;
     925                 :            : }
     926                 :            : 
     927                 :          0 : void pm_system_wakeup(void)
     928                 :            : {
     929                 :          0 :         atomic_inc(&pm_abort_suspend);
     930                 :          0 :         s2idle_wake();
     931                 :          0 : }
     932                 :            : EXPORT_SYMBOL_GPL(pm_system_wakeup);
     933                 :            : 
     934                 :          0 : void pm_system_cancel_wakeup(void)
     935                 :            : {
     936                 :          0 :         atomic_dec_if_positive(&pm_abort_suspend);
     937                 :          0 : }
     938                 :            : 
     939                 :          0 : void pm_wakeup_clear(bool reset)
     940                 :            : {
     941                 :          0 :         pm_wakeup_irq = 0;
     942         [ #  # ]:          0 :         if (reset)
     943                 :          0 :                 atomic_set(&pm_abort_suspend, 0);
     944                 :          0 : }
     945                 :            : 
     946                 :          0 : void pm_system_irq_wakeup(unsigned int irq_number)
     947                 :            : {
     948         [ #  # ]:          0 :         if (pm_wakeup_irq == 0) {
     949                 :          0 :                 pm_wakeup_irq = irq_number;
     950                 :          0 :                 pm_system_wakeup();
     951                 :            :         }
     952                 :          0 : }
     953                 :            : 
     954                 :            : /**
     955                 :            :  * pm_get_wakeup_count - Read the number of registered wakeup events.
     956                 :            :  * @count: Address to store the value at.
     957                 :            :  * @block: Whether or not to block.
     958                 :            :  *
     959                 :            :  * Store the number of registered wakeup events at the address in @count.  If
     960                 :            :  * @block is set, block until the current number of wakeup events being
     961                 :            :  * processed is zero.
     962                 :            :  *
     963                 :            :  * Return 'false' if the current number of wakeup events being processed is
     964                 :            :  * nonzero.  Otherwise return 'true'.
     965                 :            :  */
     966                 :          0 : bool pm_get_wakeup_count(unsigned int *count, bool block)
     967                 :            : {
     968                 :          0 :         unsigned int cnt, inpr;
     969                 :            : 
     970         [ #  # ]:          0 :         if (block) {
     971                 :          0 :                 DEFINE_WAIT(wait);
     972                 :            : 
     973                 :          0 :                 for (;;) {
     974                 :          0 :                         prepare_to_wait(&wakeup_count_wait_queue, &wait,
     975                 :            :                                         TASK_INTERRUPTIBLE);
     976                 :          0 :                         split_counters(&cnt, &inpr);
     977   [ #  #  #  # ]:          0 :                         if (inpr == 0 || signal_pending(current))
     978                 :            :                                 break;
     979                 :          0 :                         pm_print_active_wakeup_sources();
     980                 :          0 :                         schedule();
     981                 :            :                 }
     982                 :          0 :                 finish_wait(&wakeup_count_wait_queue, &wait);
     983                 :            :         }
     984                 :            : 
     985                 :          0 :         split_counters(&cnt, &inpr);
     986                 :          0 :         *count = cnt;
     987                 :          0 :         return !inpr;
     988                 :            : }
     989                 :            : 
     990                 :            : /**
     991                 :            :  * pm_save_wakeup_count - Save the current number of registered wakeup events.
     992                 :            :  * @count: Value to compare with the current number of registered wakeup events.
     993                 :            :  *
     994                 :            :  * If @count is equal to the current number of registered wakeup events and the
     995                 :            :  * current number of wakeup events being processed is zero, store @count as the
     996                 :            :  * old number of registered wakeup events for pm_check_wakeup_events(), enable
     997                 :            :  * wakeup events detection and return 'true'.  Otherwise disable wakeup events
     998                 :            :  * detection and return 'false'.
     999                 :            :  */
    1000                 :          0 : bool pm_save_wakeup_count(unsigned int count)
    1001                 :            : {
    1002                 :          0 :         unsigned int cnt, inpr;
    1003                 :          0 :         unsigned long flags;
    1004                 :            : 
    1005                 :          0 :         events_check_enabled = false;
    1006                 :          0 :         raw_spin_lock_irqsave(&events_lock, flags);
    1007                 :          0 :         split_counters(&cnt, &inpr);
    1008   [ #  #  #  # ]:          0 :         if (cnt == count && inpr == 0) {
    1009                 :          0 :                 saved_count = count;
    1010                 :          0 :                 events_check_enabled = true;
    1011                 :            :         }
    1012                 :          0 :         raw_spin_unlock_irqrestore(&events_lock, flags);
    1013                 :          0 :         return events_check_enabled;
    1014                 :            : }
    1015                 :            : 
    1016                 :            : #ifdef CONFIG_PM_AUTOSLEEP
    1017                 :            : /**
    1018                 :            :  * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
    1019                 :            :  * @enabled: Whether to set or to clear the autosleep_enabled flags.
    1020                 :            :  */
    1021                 :            : void pm_wakep_autosleep_enabled(bool set)
    1022                 :            : {
    1023                 :            :         struct wakeup_source *ws;
    1024                 :            :         ktime_t now = ktime_get();
    1025                 :            :         int srcuidx;
    1026                 :            : 
    1027                 :            :         srcuidx = srcu_read_lock(&wakeup_srcu);
    1028                 :            :         list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
    1029                 :            :                 spin_lock_irq(&ws->lock);
    1030                 :            :                 if (ws->autosleep_enabled != set) {
    1031                 :            :                         ws->autosleep_enabled = set;
    1032                 :            :                         if (ws->active) {
    1033                 :            :                                 if (set)
    1034                 :            :                                         ws->start_prevent_time = now;
    1035                 :            :                                 else
    1036                 :            :                                         update_prevent_sleep_time(ws, now);
    1037                 :            :                         }
    1038                 :            :                 }
    1039                 :            :                 spin_unlock_irq(&ws->lock);
    1040                 :            :         }
    1041                 :            :         srcu_read_unlock(&wakeup_srcu, srcuidx);
    1042                 :            : }
    1043                 :            : #endif /* CONFIG_PM_AUTOSLEEP */
    1044                 :            : 
    1045                 :            : /**
    1046                 :            :  * print_wakeup_source_stats - Print wakeup source statistics information.
    1047                 :            :  * @m: seq_file to print the statistics into.
    1048                 :            :  * @ws: Wakeup source object to print the statistics for.
    1049                 :            :  */
    1050                 :          0 : static int print_wakeup_source_stats(struct seq_file *m,
    1051                 :            :                                      struct wakeup_source *ws)
    1052                 :            : {
    1053                 :          0 :         unsigned long flags;
    1054                 :          0 :         ktime_t total_time;
    1055                 :          0 :         ktime_t max_time;
    1056                 :          0 :         unsigned long active_count;
    1057                 :          0 :         ktime_t active_time;
    1058                 :          0 :         ktime_t prevent_sleep_time;
    1059                 :            : 
    1060                 :          0 :         spin_lock_irqsave(&ws->lock, flags);
    1061                 :            : 
    1062                 :          0 :         total_time = ws->total_time;
    1063                 :          0 :         max_time = ws->max_time;
    1064                 :          0 :         prevent_sleep_time = ws->prevent_sleep_time;
    1065                 :          0 :         active_count = ws->active_count;
    1066         [ #  # ]:          0 :         if (ws->active) {
    1067                 :          0 :                 ktime_t now = ktime_get();
    1068                 :            : 
    1069                 :          0 :                 active_time = ktime_sub(now, ws->last_time);
    1070                 :          0 :                 total_time = ktime_add(total_time, active_time);
    1071                 :          0 :                 if (active_time > max_time)
    1072                 :            :                         max_time = active_time;
    1073                 :            : 
    1074         [ #  # ]:          0 :                 if (ws->autosleep_enabled)
    1075                 :          0 :                         prevent_sleep_time = ktime_add(prevent_sleep_time,
    1076                 :            :                                 ktime_sub(now, ws->start_prevent_time));
    1077                 :            :         } else {
    1078                 :            :                 active_time = 0;
    1079                 :            :         }
    1080                 :            : 
    1081                 :          0 :         seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n",
    1082                 :            :                    ws->name, active_count, ws->event_count,
    1083                 :            :                    ws->wakeup_count, ws->expire_count,
    1084                 :            :                    ktime_to_ms(active_time), ktime_to_ms(total_time),
    1085                 :            :                    ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
    1086                 :            :                    ktime_to_ms(prevent_sleep_time));
    1087                 :            : 
    1088                 :          0 :         spin_unlock_irqrestore(&ws->lock, flags);
    1089                 :            : 
    1090                 :          0 :         return 0;
    1091                 :            : }
    1092                 :            : 
    1093                 :          0 : static void *wakeup_sources_stats_seq_start(struct seq_file *m,
    1094                 :            :                                         loff_t *pos)
    1095                 :            : {
    1096                 :          0 :         struct wakeup_source *ws;
    1097                 :          0 :         loff_t n = *pos;
    1098                 :          0 :         int *srcuidx = m->private;
    1099                 :            : 
    1100         [ #  # ]:          0 :         if (n == 0) {
    1101                 :          0 :                 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
    1102                 :            :                         "expire_count\tactive_since\ttotal_time\tmax_time\t"
    1103                 :            :                         "last_change\tprevent_suspend_time\n");
    1104                 :            :         }
    1105                 :            : 
    1106                 :          0 :         *srcuidx = srcu_read_lock(&wakeup_srcu);
    1107         [ #  # ]:          0 :         list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
    1108         [ #  # ]:          0 :                 if (n-- <= 0)
    1109                 :          0 :                         return ws;
    1110                 :            :         }
    1111                 :            : 
    1112                 :            :         return NULL;
    1113                 :            : }
    1114                 :            : 
    1115                 :          0 : static void *wakeup_sources_stats_seq_next(struct seq_file *m,
    1116                 :            :                                         void *v, loff_t *pos)
    1117                 :            : {
    1118                 :          0 :         struct wakeup_source *ws = v;
    1119                 :          0 :         struct wakeup_source *next_ws = NULL;
    1120                 :            : 
    1121                 :          0 :         ++(*pos);
    1122                 :            : 
    1123         [ #  # ]:          0 :         list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) {
    1124                 :          0 :                 next_ws = ws;
    1125                 :          0 :                 break;
    1126                 :            :         }
    1127                 :            : 
    1128         [ #  # ]:          0 :         if (!next_ws)
    1129                 :          0 :                 print_wakeup_source_stats(m, &deleted_ws);
    1130                 :            : 
    1131                 :          0 :         return next_ws;
    1132                 :            : }
    1133                 :            : 
    1134                 :          0 : static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
    1135                 :            : {
    1136                 :          0 :         int *srcuidx = m->private;
    1137                 :            : 
    1138                 :          0 :         srcu_read_unlock(&wakeup_srcu, *srcuidx);
    1139                 :          0 : }
    1140                 :            : 
    1141                 :            : /**
    1142                 :            :  * wakeup_sources_stats_seq_show - Print wakeup sources statistics information.
    1143                 :            :  * @m: seq_file to print the statistics into.
    1144                 :            :  * @v: wakeup_source of each iteration
    1145                 :            :  */
    1146                 :          0 : static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v)
    1147                 :            : {
    1148                 :          0 :         struct wakeup_source *ws = v;
    1149                 :            : 
    1150                 :          0 :         print_wakeup_source_stats(m, ws);
    1151                 :            : 
    1152                 :          0 :         return 0;
    1153                 :            : }
    1154                 :            : 
    1155                 :            : static const struct seq_operations wakeup_sources_stats_seq_ops = {
    1156                 :            :         .start = wakeup_sources_stats_seq_start,
    1157                 :            :         .next  = wakeup_sources_stats_seq_next,
    1158                 :            :         .stop  = wakeup_sources_stats_seq_stop,
    1159                 :            :         .show  = wakeup_sources_stats_seq_show,
    1160                 :            : };
    1161                 :            : 
    1162                 :          0 : static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
    1163                 :            : {
    1164                 :          0 :         return seq_open_private(file, &wakeup_sources_stats_seq_ops, sizeof(int));
    1165                 :            : }
    1166                 :            : 
    1167                 :            : static const struct file_operations wakeup_sources_stats_fops = {
    1168                 :            :         .owner = THIS_MODULE,
    1169                 :            :         .open = wakeup_sources_stats_open,
    1170                 :            :         .read = seq_read,
    1171                 :            :         .llseek = seq_lseek,
    1172                 :            :         .release = seq_release_private,
    1173                 :            : };
    1174                 :            : 
    1175                 :         11 : static int __init wakeup_sources_debugfs_init(void)
    1176                 :            : {
    1177                 :         11 :         debugfs_create_file("wakeup_sources", S_IRUGO, NULL, NULL,
    1178                 :            :                             &wakeup_sources_stats_fops);
    1179                 :         11 :         return 0;
    1180                 :            : }
    1181                 :            : 
    1182                 :            : postcore_initcall(wakeup_sources_debugfs_init);

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