forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
/*
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* kernel/power/autosleep.c
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*
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* Opportunistic sleep support.
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*
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* Copyright (C) 2012 Rafael J. Wysocki <rjw@sisk.pl>
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*/
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm_wakeup.h>
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#include "power.h"
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static suspend_state_t autosleep_state;
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static struct workqueue_struct *autosleep_wq;
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/*
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* Note: it is only safe to mutex_lock(&autosleep_lock) if a wakeup_source
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* is active, otherwise a deadlock with try_to_suspend() is possible.
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* Alternatively mutex_lock_interruptible() can be used. This will then fail
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* if an auto_sleep cycle tries to freeze processes.
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*/
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static DEFINE_MUTEX(autosleep_lock);
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static struct wakeup_source *autosleep_ws;
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static void try_to_suspend(struct work_struct *work)
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{
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unsigned int initial_count, final_count;
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if (!pm_get_wakeup_count(&initial_count, true))
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goto out;
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mutex_lock(&autosleep_lock);
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if (!pm_save_wakeup_count(initial_count) ||
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system_state != SYSTEM_RUNNING) {
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mutex_unlock(&autosleep_lock);
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goto out;
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}
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if (autosleep_state == PM_SUSPEND_ON) {
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mutex_unlock(&autosleep_lock);
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return;
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}
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if (autosleep_state >= PM_SUSPEND_MAX)
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hibernate();
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else
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pm_suspend(autosleep_state);
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mutex_unlock(&autosleep_lock);
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if (!pm_get_wakeup_count(&final_count, false))
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goto out;
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/*
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* If the wakeup occured for an unknown reason, wait to prevent the
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* system from trying to suspend and waking up in a tight loop.
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*/
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if (final_count == initial_count)
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schedule_timeout_uninterruptible(HZ / 2);
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out:
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queue_up_suspend_work();
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}
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static DECLARE_WORK(suspend_work, try_to_suspend);
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void queue_up_suspend_work(void)
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{
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if (autosleep_state > PM_SUSPEND_ON)
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queue_work(autosleep_wq, &suspend_work);
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}
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suspend_state_t pm_autosleep_state(void)
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{
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return autosleep_state;
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}
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int pm_autosleep_lock(void)
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{
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return mutex_lock_interruptible(&autosleep_lock);
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}
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void pm_autosleep_unlock(void)
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{
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mutex_unlock(&autosleep_lock);
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}
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int pm_autosleep_set_state(suspend_state_t state)
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{
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#ifndef CONFIG_HIBERNATION
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if (state >= PM_SUSPEND_MAX)
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return -EINVAL;
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#endif
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__pm_stay_awake(autosleep_ws);
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mutex_lock(&autosleep_lock);
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autosleep_state = state;
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__pm_relax(autosleep_ws);
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if (state > PM_SUSPEND_ON) {
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pm_wakep_autosleep_enabled(true);
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queue_up_suspend_work();
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} else {
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pm_wakep_autosleep_enabled(false);
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}
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mutex_unlock(&autosleep_lock);
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return 0;
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}
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int __init pm_autosleep_init(void)
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{
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autosleep_ws = wakeup_source_register("autosleep");
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if (!autosleep_ws)
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return -ENOMEM;
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autosleep_wq = alloc_ordered_workqueue("autosleep", 0);
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if (autosleep_wq)
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return 0;
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wakeup_source_unregister(autosleep_ws);
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return -ENOMEM;
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}
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