Release 4.15 kernel/power/suspend.c

/*
 * kernel/power/suspend.c - Suspend to RAM and standby functionality.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 *
 * This file is released under the GPLv2.
 */


#define pr_fmt(fmt) "PM: " fmt

#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/syscalls.h>
#include <linux/gfp.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/ftrace.h>
#include <trace/events/power.h>
#include <linux/compiler.h>
#include <linux/moduleparam.h>

#include "power.h"


const char * const pm_labels[] = {
	[PM_SUSPEND_TO_IDLE] = "freeze",
	[PM_SUSPEND_STANDBY] = "standby",
	[PM_SUSPEND_MEM] = "mem",
};

const char *pm_states[PM_SUSPEND_MAX];

static const char * const mem_sleep_labels[] = {
	[PM_SUSPEND_TO_IDLE] = "s2idle",
	[PM_SUSPEND_STANDBY] = "shallow",
	[PM_SUSPEND_MEM] = "deep",
};

const char *mem_sleep_states[PM_SUSPEND_MAX];


suspend_state_t mem_sleep_current = PM_SUSPEND_TO_IDLE;

suspend_state_t mem_sleep_default = PM_SUSPEND_MAX;

suspend_state_t pm_suspend_target_state;

EXPORT_SYMBOL_GPL(pm_suspend_target_state);


unsigned int pm_suspend_global_flags;

EXPORT_SYMBOL_GPL(pm_suspend_global_flags);


static const struct platform_suspend_ops *suspend_ops;

static const struct platform_s2idle_ops *s2idle_ops;
static DECLARE_WAIT_QUEUE_HEAD(s2idle_wait_head);


enum s2idle_states __read_mostly s2idle_state;
static DEFINE_SPINLOCK(s2idle_lock);



void s2idle_set_ops(const struct platform_s2idle_ops *ops)
{
	lock_system_sleep();
	s2idle_ops = ops;
	unlock_system_sleep();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
21
100.00%
2
100.00%
Total
21
100.00%
2
100.00%



static void s2idle_begin(void)
{
	s2idle_state = S2IDLE_STATE_NONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rui Zhang
9
75.00%
1
50.00%
Rafael J. Wysocki
3
25.00%
1
50.00%
Total
12
100.00%
2
100.00%



static void s2idle_enter(void)
{
	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, true);

	spin_lock_irq(&s2idle_lock);
	if (pm_wakeup_pending())
		goto out;

	s2idle_state = S2IDLE_STATE_ENTER;
	spin_unlock_irq(&s2idle_lock);

	get_online_cpus();
	cpuidle_resume();

	/* Push all the CPUs into the idle loop. */
	wake_up_all_idle_cpus();
	/* Make the current CPU wait so it can enter the idle loop too. */
	wait_event(s2idle_wait_head,
		   s2idle_state == S2IDLE_STATE_WAKE);

	cpuidle_pause();
	put_online_cpus();

	spin_lock_irq(&s2idle_lock);

 out:
	s2idle_state = S2IDLE_STATE_NONE;
	spin_unlock_irq(&s2idle_lock);

	trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, false);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
91
91.00%
6
85.71%
Rui Zhang
9
9.00%
1
14.29%
Total
100
100.00%
7
100.00%



static void s2idle_loop(void)
{
	pm_pr_dbg("suspend-to-idle\n");

	for (;;) {
		int error;

		dpm_noirq_begin();

		/*
                 * Suspend-to-idle equals
                 * frozen processes + suspended devices + idle processors.
                 * Thus s2idle_enter() should be called right after
                 * all devices have been suspended.
                 *
                 * Wakeups during the noirq suspend of devices may be spurious,
                 * so prevent them from terminating the loop right away.
                 */
		error = dpm_noirq_suspend_devices(PMSG_SUSPEND);
		if (!error)
			s2idle_enter();
		else if (error == -EBUSY && pm_wakeup_pending())
			error = 0;

		if (!error && s2idle_ops && s2idle_ops->wake)
			s2idle_ops->wake();

		dpm_noirq_resume_devices(PMSG_RESUME);

		dpm_noirq_end();

		if (error)
			break;

		if (s2idle_ops && s2idle_ops->sync)
			s2idle_ops->sync();

		if (pm_wakeup_pending())
			break;

		pm_wakeup_clear(false);
	}

	pm_pr_dbg("resume from suspend-to-idle\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
114
99.13%
7
87.50%
Rui Zhang
1
0.87%
1
12.50%
Total
115
100.00%
8
100.00%



void s2idle_wake(void)
{
	unsigned long flags;

	spin_lock_irqsave(&s2idle_lock, flags);
	if (s2idle_state > S2IDLE_STATE_NONE) {
		s2idle_state = S2IDLE_STATE_WAKE;
		wake_up(&s2idle_wait_head);
	}
	spin_unlock_irqrestore(&s2idle_lock, flags);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
32
71.11%
2
66.67%
Rui Zhang
13
28.89%
1
33.33%
Total
45
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(s2idle_wake);



static bool valid_state(suspend_state_t state)
{
	/*
         * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level
         * support and need to be valid to the low level
         * implementation, no valid callback implies that none are valid.
         */
	return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
24
100.00%
1
100.00%
Total
24
100.00%
1
100.00%



void __init pm_states_init(void)
{
	/* "mem" and "freeze" are always present in /sys/power/state. */
	pm_states[PM_SUSPEND_MEM] = pm_labels[PM_SUSPEND_MEM];
	pm_states[PM_SUSPEND_TO_IDLE] = pm_labels[PM_SUSPEND_TO_IDLE];
	/*
         * Suspend-to-idle should be supported even without any suspend_ops,
         * initialize mem_sleep_states[] accordingly here.
         */
	mem_sleep_states[PM_SUSPEND_TO_IDLE] = mem_sleep_labels[PM_SUSPEND_TO_IDLE];
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
24
60.00%
2
66.67%
Sudeep Holla
16
40.00%
1
33.33%
Total
40
100.00%
3
100.00%



static int __init mem_sleep_default_setup(char *str)
{
	suspend_state_t state;

	for (state = PM_SUSPEND_TO_IDLE; state <= PM_SUSPEND_MEM; state++)
		if (mem_sleep_labels[state] &&
		    !strcmp(str, mem_sleep_labels[state])) {
			mem_sleep_default = state;
			break;
		}

	return 1;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
55
100.00%
3
100.00%
Total
55
100.00%
3
100.00%

__setup("mem_sleep_default=", mem_sleep_default_setup);

/**
 * suspend_set_ops - Set the global suspend method table.
 * @ops: Suspend operations to use.
 */


void suspend_set_ops(const struct platform_suspend_ops *ops)
{
	lock_system_sleep();

	suspend_ops = ops;

	if (valid_state(PM_SUSPEND_STANDBY)) {
		mem_sleep_states[PM_SUSPEND_STANDBY] = mem_sleep_labels[PM_SUSPEND_STANDBY];
		pm_states[PM_SUSPEND_STANDBY] = pm_labels[PM_SUSPEND_STANDBY];
		if (mem_sleep_default == PM_SUSPEND_STANDBY)
			mem_sleep_current = PM_SUSPEND_STANDBY;
	}
	if (valid_state(PM_SUSPEND_MEM)) {
		mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM];
		if (mem_sleep_default >= PM_SUSPEND_MEM)
			mem_sleep_current = PM_SUSPEND_MEM;
	}

	unlock_system_sleep();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
84
94.38%
6
75.00%
Srivatsa S. Bhat
4
4.49%
1
12.50%
Lionel Debroux
1
1.12%
1
12.50%
Total
89
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(suspend_set_ops);

/**
 * suspend_valid_only_mem - Generic memory-only valid callback.
 *
 * Platform drivers that implement mem suspend only and only need to check for
 * that in their .valid() callback can use this instead of rolling their own
 * .valid() callback.
 */


int suspend_valid_only_mem(suspend_state_t state)
{
	return state == PM_SUSPEND_MEM;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(suspend_valid_only_mem);



static bool sleep_state_supported(suspend_state_t state)
{
	return state == PM_SUSPEND_TO_IDLE || (suspend_ops && suspend_ops->enter);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
22
100.00%
2
100.00%
Total
22
100.00%
2
100.00%



static int platform_suspend_prepare(suspend_state_t state)
{
	return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare ?
		suspend_ops->prepare() : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%



static int platform_suspend_prepare_late(suspend_state_t state)
{
	return state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->prepare ?
		s2idle_ops->prepare() : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
26
96.30%
3
75.00%
Dmitry Baryshkov
1
3.70%
1
25.00%
Total
27
100.00%
4
100.00%



static int platform_suspend_prepare_noirq(suspend_state_t state)
{
	return state != PM_SUSPEND_TO_IDLE && suspend_ops->prepare_late ?
		suspend_ops->prepare_late() : 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
25
100.00%
3
100.00%
Total
25
100.00%
3
100.00%



static void platform_resume_noirq(suspend_state_t state)
{
	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->wake)
		suspend_ops->wake();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
24
100.00%
3
100.00%
Total
24
100.00%
3
100.00%



static void platform_resume_early(suspend_state_t state)
{
	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->restore)
		s2idle_ops->restore();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
25
96.15%
3
75.00%
Dmitry Baryshkov
1
3.85%
1
25.00%
Total
26
100.00%
4
100.00%



static void platform_resume_finish(suspend_state_t state)
{
	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->finish)
		suspend_ops->finish();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
24
100.00%
3
100.00%
Total
24
100.00%
3
100.00%



static int platform_suspend_begin(suspend_state_t state)
{
	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->begin)
		return s2idle_ops->begin();
	else if (suspend_ops && suspend_ops->begin)
		return suspend_ops->begin(state);
	else
		return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
46
95.83%
3
75.00%
Sudeep Holla
2
4.17%
1
25.00%
Total
48
100.00%
4
100.00%



static void platform_resume_end(suspend_state_t state)
{
	if (state == PM_SUSPEND_TO_IDLE && s2idle_ops && s2idle_ops->end)
		s2idle_ops->end();
	else if (suspend_ops && suspend_ops->end)
		suspend_ops->end();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
38
95.00%
4
80.00%
Sudeep Holla
2
5.00%
1
20.00%
Total
40
100.00%
5
100.00%



static void platform_recover(suspend_state_t state)
{
	if (state != PM_SUSPEND_TO_IDLE && suspend_ops->recover)
		suspend_ops->recover();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
23
95.83%
6
85.71%
Srivatsa S. Bhat
1
4.17%
1
14.29%
Total
24
100.00%
7
100.00%



static bool platform_suspend_again(suspend_state_t state)
{
	return state != PM_SUSPEND_TO_IDLE && suspend_ops->suspend_again ?
		suspend_ops->suspend_again() : false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
25
100.00%
3
100.00%
Total
25
100.00%
3
100.00%

#ifdef CONFIG_PM_DEBUG

static unsigned int pm_test_delay = 5;
module_param(pm_test_delay, uint, 0644);
MODULE_PARM_DESC(pm_test_delay,
		 "Number of seconds to wait before resuming from suspend test");
#endif



static int suspend_test(int level)
{
#ifdef CONFIG_PM_DEBUG
	if (pm_test_level == level) {
		pr_info("suspend debug: Waiting for %d second(s).\n",
				pm_test_delay);
		mdelay(pm_test_delay * 1000);
		return 1;
	}
#endif /* !CONFIG_PM_DEBUG */
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
36
83.72%
1
33.33%
Brian Norris
6
13.95%
1
33.33%
Saurabh Sengar
1
2.33%
1
33.33%
Total
43
100.00%
3
100.00%

/**
 * suspend_prepare - Prepare for entering system sleep state.
 *
 * Common code run for every system sleep state that can be entered (except for
 * hibernation).  Run suspend notifiers, allocate the "suspend" console and
 * freeze processes.
 */


static int suspend_prepare(suspend_state_t state)
{
	int error, nr_calls = 0;

	if (!sleep_state_supported(state))
		return -EPERM;

	pm_prepare_console();

	error = __pm_notifier_call_chain(PM_SUSPEND_PREPARE, -1, &nr_calls);
	if (error) {
		nr_calls--;
		goto Finish;
	}

	trace_suspend_resume(TPS("freeze_processes"), 0, true);
	error = suspend_freeze_processes();
	trace_suspend_resume(TPS("freeze_processes"), 0, false);
	if (!error)
		return 0;

	suspend_stats.failed_freeze++;
	dpm_save_failed_step(SUSPEND_FREEZE);
 Finish:
	__pm_notifier_call_chain(PM_POST_SUSPEND, nr_calls, NULL);
	pm_restore_console();
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
56
46.67%
2
28.57%
Todd E Brandt
24
20.00%
1
14.29%
Lianwei Wang
21
17.50%
1
14.29%
Liu ShuoX
10
8.33%
1
14.29%
Rui Zhang
5
4.17%
1
14.29%
Tejun Heo
4
3.33%
1
14.29%
Total
120
100.00%
7
100.00%

/* default implementation */


void __weak arch_suspend_disable_irqs(void)
{
	local_irq_disable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
8
72.73%
1
50.00%
Gideon Israel Dsouza
3
27.27%
1
50.00%
Total
11
100.00%
2
100.00%

/* default implementation */


void __weak arch_suspend_enable_irqs(void)
{
	local_irq_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
8
72.73%
1
50.00%
Gideon Israel Dsouza
3
27.27%
1
50.00%
Total
11
100.00%
2
100.00%

/**
 * suspend_enter - Make the system enter the given sleep state.
 * @state: System sleep state to enter.
 * @wakeup: Returns information that the sleep state should not be re-entered.
 *
 * This function should be called after devices have been suspended.
 */


static int suspend_enter(suspend_state_t state, bool *wakeup)
{
	int error;

	error = platform_suspend_prepare(state);
	if (error)
		goto Platform_finish;

	error = dpm_suspend_late(PMSG_SUSPEND);
	if (error) {
		pr_err("late suspend of devices failed\n");
		goto Platform_finish;
	}
	error = platform_suspend_prepare_late(state);
	if (error)
		goto Devices_early_resume;

	if (state == PM_SUSPEND_TO_IDLE && pm_test_level != TEST_PLATFORM) {
		s2idle_loop();
		goto Platform_early_resume;
	}

	error = dpm_suspend_noirq(PMSG_SUSPEND);
	if (error) {
		pr_err("noirq suspend of devices failed\n");
		goto Platform_early_resume;
	}
	error = platform_suspend_prepare_noirq(state);
	if (error)
		goto Platform_wake;

	if (suspend_test(TEST_PLATFORM))
		goto Platform_wake;

	error = disable_nonboot_cpus();
	if (error || suspend_test(TEST_CPUS))
		goto Enable_cpus;

	arch_suspend_disable_irqs();
	BUG_ON(!irqs_disabled());

	error = syscore_suspend();
	if (!error) {
		*wakeup = pm_wakeup_pending();
		if (!(suspend_test(TEST_CORE) || *wakeup)) {
			trace_suspend_resume(TPS("machine_suspend"),
				state, true);
			error = suspend_ops->enter(state);
			trace_suspend_resume(TPS("machine_suspend"),
				state, false);
		} else if (*wakeup) {
			error = -EBUSY;
		}
		syscore_resume();
	}

	arch_suspend_enable_irqs();
	BUG_ON(irqs_disabled());

 Enable_cpus:
	enable_nonboot_cpus();

 Platform_wake:
	platform_resume_noirq(state);
	dpm_resume_noirq(PMSG_RESUME);

 Platform_early_resume:
	platform_resume_early(state);

 Devices_early_resume:
	dpm_resume_early(PMSG_RESUME);

 Platform_finish:
	platform_resume_finish(state);
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
214
74.56%
12
66.67%
Todd E Brandt
24
8.36%
1
5.56%
Rui Zhang
22
7.67%
2
11.11%
Ruchi Kandoi
13
4.53%
1
5.56%
MyungJoo Ham
12
4.18%
1
5.56%
Saurabh Sengar
2
0.70%
1
5.56%
Total
287
100.00%
18
100.00%

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */


int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (!sleep_state_supported(state))
		return -ENOSYS;

	pm_suspend_target_state = state;

	error = platform_suspend_begin(state);
	if (error)
		goto Close;

	suspend_console();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		pr_err("Some devices failed to suspend, or early wake event detected\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup && platform_suspend_again(state));

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_test_finish("resume devices");
	trace_suspend_resume(TPS("resume_console"), state, true);
	resume_console();
	trace_suspend_resume(TPS("resume_console"), state, false);

 Close:
	platform_resume_end(state);
	pm_suspend_target_state = PM_SUSPEND_ON;
	return error;

 Recover_platform:
	platform_recover(state);
	goto Resume_devices;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
113
62.43%
5
45.45%
Todd E Brandt
24
13.26%
1
9.09%
MyungJoo Ham
23
12.71%
2
18.18%
Rui Zhang
12
6.63%
1
9.09%
Florian Fainelli
8
4.42%
1
9.09%
Bernie Thompson
1
0.55%
1
9.09%
Total
181
100.00%
11
100.00%

/**
 * suspend_finish - Clean up before finishing the suspend sequence.
 *
 * Call platform code to clean up, restart processes, and free the console that
 * we've allocated. This routine is not called for hibernation.
 */


static void suspend_finish(void)
{
	suspend_thaw_processes();
	pm_notifier_call_chain(PM_POST_SUSPEND);
	pm_restore_console();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

/**
 * enter_state - Do common work needed to enter system sleep state.
 * @state: System sleep state to enter.
 *
 * Make sure that no one else is trying to put the system into a sleep state.
 * Fail if that's not the case.  Otherwise, prepare for system suspend, make the
 * system enter the given sleep state and clean up after wakeup.
 */


static int enter_state(suspend_state_t state)
{
	int error;

	trace_suspend_resume(TPS("suspend_enter"), state, true);
	if (state == PM_SUSPEND_TO_IDLE) {
#ifdef CONFIG_PM_DEBUG
		if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
			pr_warn("Unsupported test mode for suspend to idle, please choose none/freezer/devices/platform.\n");
			return -EAGAIN;
		}
#endif
	} else if (!valid_state(state)) {
		return -EINVAL;
	}
	if (!mutex_trylock(&pm_mutex))
		return -EBUSY;

	if (state == PM_SUSPEND_TO_IDLE)
		s2idle_begin();

#ifndef CONFIG_SUSPEND_SKIP_SYNC
	trace_suspend_resume(TPS("sync_filesystems"), 0, true);
	pr_info("Syncing filesystems ... ");
	sys_sync();
	pr_cont("done.\n");
	trace_suspend_resume(TPS("sync_filesystems"), 0, false);
#endif

	pm_pr_dbg("Preparing system for sleep (%s)\n", mem_sleep_labels[state]);
	pm_suspend_clear_flags();
	error = suspend_prepare(state);
	if (error)
		goto Unlock;

	if (suspend_test(TEST_FREEZER))
		goto Finish;

	trace_suspend_resume(TPS("suspend_enter"), state, false);
	pm_pr_dbg("Suspending system (%s)\n", mem_sleep_labels[state]);
	pm_restrict_gfp_mask();
	error = suspend_devices_and_enter(state);
	pm_restore_gfp_mask();

 Finish:
	events_check_enabled = false;
	pm_pr_dbg("Finishing wakeup.\n");
	suspend_finish();
 Unlock:
	mutex_unlock(&pm_mutex);
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
164
70.09%
10
62.50%
Todd E Brandt
48
20.51%
1
6.25%
Rui Zhang
10
4.27%
1
6.25%
Len Brown
5
2.14%
1
6.25%
Rajat Jain
4
1.71%
1
6.25%
Jon Hunter
2
0.85%
1
6.25%
Joe Perches
1
0.43%
1
6.25%
Total
234
100.00%
16
100.00%

/**
 * pm_suspend - Externally visible function for suspending the system.
 * @state: System sleep state to enter.
 *
 * Check if the value of @state represents one of the supported states,
 * execute enter_state() and update system suspend statistics.
 */


int pm_suspend(suspend_state_t state)
{
	int error;

	if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
		return -EINVAL;

	pr_info("suspend entry (%s)\n", mem_sleep_labels[state]);
	error = enter_state(state);
	if (error) {
		suspend_stats.fail++;
		dpm_save_failed_errno(error);
	} else {
		suspend_stats.success++;
	}
	pr_info("suspend exit\n");
	return error;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
66
89.19%
5
83.33%
Liu ShuoX
8
10.81%
1
16.67%
Total
74
100.00%
6
100.00%


EXPORT_SYMBOL(pm_suspend);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
1623
78.33%
35
54.69%
Todd E Brandt
120
5.79%
2
3.12%
Rui Zhang
91
4.39%
2
3.12%
Brian Norris
37
1.79%
1
1.56%
MyungJoo Ham
35
1.69%
2
3.12%
Lianwei Wang
21
1.01%
1
1.56%
Sudeep Holla
20
0.97%
1
1.56%
Matthew Garrett
18
0.87%
1
1.56%
Liu ShuoX
18
0.87%
1
1.56%
Florian Fainelli
16
0.77%
1
1.56%
Ruchi Kandoi
13
0.63%
1
1.56%
Kevin Hilman
10
0.48%
1
1.56%
Gideon Israel Dsouza
9
0.43%
1
1.56%
Srivatsa S. Bhat
8
0.39%
2
3.12%
Tejun Heo
7
0.34%
2
3.12%
Len Brown
5
0.24%
1
1.56%
Rajat Jain
4
0.19%
1
1.56%
Paul Gortmaker
3
0.14%
1
1.56%
Saurabh Sengar
3
0.14%
1
1.56%
Jean Pihet
3
0.14%
1
1.56%
Dmitry Baryshkov
2
0.10%
1
1.56%
Jon Hunter
2
0.10%
1
1.56%
Lionel Debroux
2
0.10%
1
1.56%
Joe Perches
1
0.05%
1
1.56%
Bernie Thompson
1
0.05%
1
1.56%
Total
2072
100.00%
64
100.00%
Directory: kernel/power

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.