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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129// SPDX-License-Identifier: GPL-2.0/* * kernel/power/autosleep.c * * Opportunistic sleep support. * * Copyright (C) 2012 Rafael J. Wysocki <rjw@sisk.pl> */
#include <linux/device.h>#include <linux/mutex.h>
#include "power.h"
static suspend_state_t autosleep_state;static struct workqueue_struct *autosleep_wq;/* * Note: it is only safe to mutex_lock(&autosleep_lock) if a wakeup_source * is active, otherwise a deadlock with try_to_suspend() is possible. * Alternatively mutex_lock_interruptible() can be used. This will then fail * if an auto_sleep cycle tries to freeze processes. */static DEFINE_MUTEX(autosleep_lock);static struct wakeup_source *autosleep_ws;
static void try_to_suspend(struct work_struct *work){ unsigned int initial_count, final_count;
if (!pm_get_wakeup_count(&initial_count, true)) goto out;
mutex_lock(&autosleep_lock);
if (!pm_save_wakeup_count(initial_count) || system_state != SYSTEM_RUNNING) { mutex_unlock(&autosleep_lock); goto out; }
if (autosleep_state == PM_SUSPEND_ON) { mutex_unlock(&autosleep_lock); return; } if (autosleep_state >= PM_SUSPEND_MAX) hibernate(); else pm_suspend(autosleep_state);
mutex_unlock(&autosleep_lock);
if (!pm_get_wakeup_count(&final_count, false)) goto out;
/* * If the wakeup occurred for an unknown reason, wait to prevent the * system from trying to suspend and waking up in a tight loop. */ if (final_count == initial_count) schedule_timeout_uninterruptible(HZ / 2);
out: queue_up_suspend_work();}
static DECLARE_WORK(suspend_work, try_to_suspend);
void queue_up_suspend_work(void){ if (autosleep_state > PM_SUSPEND_ON) queue_work(autosleep_wq, &suspend_work);}
suspend_state_t pm_autosleep_state(void){ return autosleep_state;}
int pm_autosleep_lock(void){ return mutex_lock_interruptible(&autosleep_lock);}
void pm_autosleep_unlock(void){ mutex_unlock(&autosleep_lock);}
int pm_autosleep_set_state(suspend_state_t state){
#ifndef CONFIG_HIBERNATION if (state >= PM_SUSPEND_MAX) return -EINVAL;#endif
__pm_stay_awake(autosleep_ws);
mutex_lock(&autosleep_lock);
autosleep_state = state;
__pm_relax(autosleep_ws);
if (state > PM_SUSPEND_ON) { pm_wakep_autosleep_enabled(true); queue_up_suspend_work(); } else { pm_wakep_autosleep_enabled(false); }
mutex_unlock(&autosleep_lock); return 0;}
int __init pm_autosleep_init(void){ autosleep_ws = wakeup_source_register(NULL, "autosleep"); if (!autosleep_ws) return -ENOMEM;
autosleep_wq = alloc_ordered_workqueue("autosleep", 0); if (autosleep_wq) return 0;
wakeup_source_unregister(autosleep_ws); return -ENOMEM;}