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/*
* 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.
*/
#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_FREEZE] = "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_FREEZE] = "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_FREEZE;
static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM;
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_freeze_ops *freeze_ops;
static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
enum freeze_state __read_mostly suspend_freeze_state;
static DEFINE_SPINLOCK(suspend_freeze_lock);
void freeze_set_ops(const struct platform_freeze_ops *ops)
{
lock_system_sleep();
freeze_ops = ops;
unlock_system_sleep();
}
static void freeze_begin(void)
{
suspend_freeze_state = FREEZE_STATE_NONE;
}
static void freeze_enter(void)
{
trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, true);
spin_lock_irq(&suspend_freeze_lock);
if (pm_wakeup_pending())
goto out;
suspend_freeze_state = FREEZE_STATE_ENTER;
spin_unlock_irq(&suspend_freeze_lock);
get_online_cpus();
cpuidle_resume();
/* Push all the CPUs into the idle loop. */
wake_up_all_idle_cpus();
pr_debug("PM: suspend-to-idle\n");
/* Make the current CPU wait so it can enter the idle loop too. */
wait_event(suspend_freeze_wait_head,
suspend_freeze_state == FREEZE_STATE_WAKE);
pr_debug("PM: resume from suspend-to-idle\n");
cpuidle_pause();
put_online_cpus();
spin_lock_irq(&suspend_freeze_lock);
out:
suspend_freeze_state = FREEZE_STATE_NONE;
spin_unlock_irq(&suspend_freeze_lock);
trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_FREEZE, false);
}
static void s2idle_loop(void)
{
do {
freeze_enter();
if (freeze_ops && freeze_ops->wake)
freeze_ops->wake();
dpm_resume_noirq(PMSG_RESUME);
if (freeze_ops && freeze_ops->sync)
freeze_ops->sync();
if (pm_wakeup_pending())
break;
pm_wakeup_clear(false);
} while (!dpm_suspend_noirq(PMSG_SUSPEND));
}
void freeze_wake(void)
{
unsigned long flags;
spin_lock_irqsave(&suspend_freeze_lock, flags);
if (suspend_freeze_state > FREEZE_STATE_NONE) {
suspend_freeze_state = FREEZE_STATE_WAKE;
wake_up(&suspend_freeze_wait_head);
}
spin_unlock_irqrestore(&suspend_freeze_lock, flags);
}
EXPORT_SYMBOL_GPL(freeze_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);
}
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_FREEZE] = pm_labels[PM_SUSPEND_FREEZE];
/*
* Suspend-to-idle should be supported even without any suspend_ops,
* initialize mem_sleep_states[] accordingly here.
*/
mem_sleep_states[PM_SUSPEND_FREEZE] = mem_sleep_labels[PM_SUSPEND_FREEZE];
}
static int __init mem_sleep_default_setup(char *str)
{
suspend_state_t state;
for (state = PM_SUSPEND_FREEZE; state <= PM_SUSPEND_MEM; state++)
if (mem_sleep_labels[state] &&
!strcmp(str, mem_sleep_labels[state])) {
mem_sleep_default = state;
break;
}
return 1;
}
__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();
}
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;
}
EXPORT_SYMBOL_GPL(suspend_valid_only_mem);
static bool sleep_state_supported(suspend_state_t state)
{
return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter);
}
static int platform_suspend_prepare(suspend_state_t state)
{
return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ?
suspend_ops->prepare() : 0;
}
static int platform_suspend_prepare_late(suspend_state_t state)
{
return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ?
freeze_ops->prepare() : 0;
}
static int platform_suspend_prepare_noirq(suspend_state_t state)
{
return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ?
suspend_ops->prepare_late() : 0;
}
static void platform_resume_noirq(suspend_state_t state)
{
if (state != PM_SUSPEND_FREEZE && suspend_ops->wake)
suspend_ops->wake();
}
static void platform_resume_early(suspend_state_t state)
{
if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore)
freeze_ops->restore();
}
static void platform_resume_finish(suspend_state_t state)
{
if (state != PM_SUSPEND_FREEZE && suspend_ops->finish)
suspend_ops->finish();
}
static int platform_suspend_begin(suspend_state_t state)
{
if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin)
return freeze_ops->begin();
else if (suspend_ops && suspend_ops->begin)
return suspend_ops->begin(state);
else
return 0;
}
static void platform_resume_end(suspend_state_t state)
{
if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end)
freeze_ops->end();
else if
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