forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
959 lines
22 KiB
959 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* kernel/power/main.c - PM subsystem core functionality. |
|
* |
|
* Copyright (c) 2003 Patrick Mochel |
|
* Copyright (c) 2003 Open Source Development Lab |
|
*/ |
|
|
|
#include <linux/export.h> |
|
#include <linux/kobject.h> |
|
#include <linux/string.h> |
|
#include <linux/pm-trace.h> |
|
#include <linux/workqueue.h> |
|
#include <linux/debugfs.h> |
|
#include <linux/seq_file.h> |
|
#include <linux/suspend.h> |
|
#include <linux/syscalls.h> |
|
#include <linux/pm_runtime.h> |
|
|
|
#include "power.h" |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
|
|
void lock_system_sleep(void) |
|
{ |
|
current->flags |= PF_FREEZER_SKIP; |
|
mutex_lock(&system_transition_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(lock_system_sleep); |
|
|
|
void unlock_system_sleep(void) |
|
{ |
|
/* |
|
* Don't use freezer_count() because we don't want the call to |
|
* try_to_freeze() here. |
|
* |
|
* Reason: |
|
* Fundamentally, we just don't need it, because freezing condition |
|
* doesn't come into effect until we release the |
|
* system_transition_mutex lock, since the freezer always works with |
|
* system_transition_mutex held. |
|
* |
|
* More importantly, in the case of hibernation, |
|
* unlock_system_sleep() gets called in snapshot_read() and |
|
* snapshot_write() when the freezing condition is still in effect. |
|
* Which means, if we use try_to_freeze() here, it would make them |
|
* enter the refrigerator, thus causing hibernation to lockup. |
|
*/ |
|
current->flags &= ~PF_FREEZER_SKIP; |
|
mutex_unlock(&system_transition_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(unlock_system_sleep); |
|
|
|
void ksys_sync_helper(void) |
|
{ |
|
ktime_t start; |
|
long elapsed_msecs; |
|
|
|
start = ktime_get(); |
|
ksys_sync(); |
|
elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start)); |
|
pr_info("Filesystems sync: %ld.%03ld seconds\n", |
|
elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC); |
|
} |
|
EXPORT_SYMBOL_GPL(ksys_sync_helper); |
|
|
|
/* Routines for PM-transition notifications */ |
|
|
|
static BLOCKING_NOTIFIER_HEAD(pm_chain_head); |
|
|
|
int register_pm_notifier(struct notifier_block *nb) |
|
{ |
|
return blocking_notifier_chain_register(&pm_chain_head, nb); |
|
} |
|
EXPORT_SYMBOL_GPL(register_pm_notifier); |
|
|
|
int unregister_pm_notifier(struct notifier_block *nb) |
|
{ |
|
return blocking_notifier_chain_unregister(&pm_chain_head, nb); |
|
} |
|
EXPORT_SYMBOL_GPL(unregister_pm_notifier); |
|
|
|
int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down) |
|
{ |
|
int ret; |
|
|
|
ret = blocking_notifier_call_chain_robust(&pm_chain_head, val_up, val_down, NULL); |
|
|
|
return notifier_to_errno(ret); |
|
} |
|
|
|
int pm_notifier_call_chain(unsigned long val) |
|
{ |
|
return blocking_notifier_call_chain(&pm_chain_head, val, NULL); |
|
} |
|
|
|
/* If set, devices may be suspended and resumed asynchronously. */ |
|
int pm_async_enabled = 1; |
|
|
|
static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", pm_async_enabled); |
|
} |
|
|
|
static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned long val; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
if (val > 1) |
|
return -EINVAL; |
|
|
|
pm_async_enabled = val; |
|
return n; |
|
} |
|
|
|
power_attr(pm_async); |
|
|
|
#ifdef CONFIG_SUSPEND |
|
static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
char *s = buf; |
|
suspend_state_t i; |
|
|
|
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) |
|
if (mem_sleep_states[i]) { |
|
const char *label = mem_sleep_states[i]; |
|
|
|
if (mem_sleep_current == i) |
|
s += sprintf(s, "[%s] ", label); |
|
else |
|
s += sprintf(s, "%s ", label); |
|
} |
|
|
|
/* Convert the last space to a newline if needed. */ |
|
if (s != buf) |
|
*(s-1) = '\n'; |
|
|
|
return (s - buf); |
|
} |
|
|
|
static suspend_state_t decode_suspend_state(const char *buf, size_t n) |
|
{ |
|
suspend_state_t state; |
|
char *p; |
|
int len; |
|
|
|
p = memchr(buf, '\n', n); |
|
len = p ? p - buf : n; |
|
|
|
for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
|
const char *label = mem_sleep_states[state]; |
|
|
|
if (label && len == strlen(label) && !strncmp(buf, label, len)) |
|
return state; |
|
} |
|
|
|
return PM_SUSPEND_ON; |
|
} |
|
|
|
static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
suspend_state_t state; |
|
int error; |
|
|
|
error = pm_autosleep_lock(); |
|
if (error) |
|
return error; |
|
|
|
if (pm_autosleep_state() > PM_SUSPEND_ON) { |
|
error = -EBUSY; |
|
goto out; |
|
} |
|
|
|
state = decode_suspend_state(buf, n); |
|
if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) |
|
mem_sleep_current = state; |
|
else |
|
error = -EINVAL; |
|
|
|
out: |
|
pm_autosleep_unlock(); |
|
return error ? error : n; |
|
} |
|
|
|
power_attr(mem_sleep); |
|
|
|
/* |
|
* sync_on_suspend: invoke ksys_sync_helper() before suspend. |
|
* |
|
* show() returns whether ksys_sync_helper() is invoked before suspend. |
|
* store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. |
|
*/ |
|
bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); |
|
|
|
static ssize_t sync_on_suspend_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", sync_on_suspend_enabled); |
|
} |
|
|
|
static ssize_t sync_on_suspend_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned long val; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
if (val > 1) |
|
return -EINVAL; |
|
|
|
sync_on_suspend_enabled = !!val; |
|
return n; |
|
} |
|
|
|
power_attr(sync_on_suspend); |
|
#endif /* CONFIG_SUSPEND */ |
|
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG |
|
int pm_test_level = TEST_NONE; |
|
|
|
static const char * const pm_tests[__TEST_AFTER_LAST] = { |
|
[TEST_NONE] = "none", |
|
[TEST_CORE] = "core", |
|
[TEST_CPUS] = "processors", |
|
[TEST_PLATFORM] = "platform", |
|
[TEST_DEVICES] = "devices", |
|
[TEST_FREEZER] = "freezer", |
|
}; |
|
|
|
static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
char *s = buf; |
|
int level; |
|
|
|
for (level = TEST_FIRST; level <= TEST_MAX; level++) |
|
if (pm_tests[level]) { |
|
if (level == pm_test_level) |
|
s += sprintf(s, "[%s] ", pm_tests[level]); |
|
else |
|
s += sprintf(s, "%s ", pm_tests[level]); |
|
} |
|
|
|
if (s != buf) |
|
/* convert the last space to a newline */ |
|
*(s-1) = '\n'; |
|
|
|
return (s - buf); |
|
} |
|
|
|
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
const char * const *s; |
|
int level; |
|
char *p; |
|
int len; |
|
int error = -EINVAL; |
|
|
|
p = memchr(buf, '\n', n); |
|
len = p ? p - buf : n; |
|
|
|
lock_system_sleep(); |
|
|
|
level = TEST_FIRST; |
|
for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) |
|
if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { |
|
pm_test_level = level; |
|
error = 0; |
|
break; |
|
} |
|
|
|
unlock_system_sleep(); |
|
|
|
return error ? error : n; |
|
} |
|
|
|
power_attr(pm_test); |
|
#endif /* CONFIG_PM_SLEEP_DEBUG */ |
|
|
|
static char *suspend_step_name(enum suspend_stat_step step) |
|
{ |
|
switch (step) { |
|
case SUSPEND_FREEZE: |
|
return "freeze"; |
|
case SUSPEND_PREPARE: |
|
return "prepare"; |
|
case SUSPEND_SUSPEND: |
|
return "suspend"; |
|
case SUSPEND_SUSPEND_NOIRQ: |
|
return "suspend_noirq"; |
|
case SUSPEND_RESUME_NOIRQ: |
|
return "resume_noirq"; |
|
case SUSPEND_RESUME: |
|
return "resume"; |
|
default: |
|
return ""; |
|
} |
|
} |
|
|
|
#define suspend_attr(_name) \ |
|
static ssize_t _name##_show(struct kobject *kobj, \ |
|
struct kobj_attribute *attr, char *buf) \ |
|
{ \ |
|
return sprintf(buf, "%d\n", suspend_stats._name); \ |
|
} \ |
|
static struct kobj_attribute _name = __ATTR_RO(_name) |
|
|
|
suspend_attr(success); |
|
suspend_attr(fail); |
|
suspend_attr(failed_freeze); |
|
suspend_attr(failed_prepare); |
|
suspend_attr(failed_suspend); |
|
suspend_attr(failed_suspend_late); |
|
suspend_attr(failed_suspend_noirq); |
|
suspend_attr(failed_resume); |
|
suspend_attr(failed_resume_early); |
|
suspend_attr(failed_resume_noirq); |
|
|
|
static ssize_t last_failed_dev_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
int index; |
|
char *last_failed_dev = NULL; |
|
|
|
index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; |
|
index %= REC_FAILED_NUM; |
|
last_failed_dev = suspend_stats.failed_devs[index]; |
|
|
|
return sprintf(buf, "%s\n", last_failed_dev); |
|
} |
|
static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); |
|
|
|
static ssize_t last_failed_errno_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
int index; |
|
int last_failed_errno; |
|
|
|
index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; |
|
index %= REC_FAILED_NUM; |
|
last_failed_errno = suspend_stats.errno[index]; |
|
|
|
return sprintf(buf, "%d\n", last_failed_errno); |
|
} |
|
static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); |
|
|
|
static ssize_t last_failed_step_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
int index; |
|
enum suspend_stat_step step; |
|
char *last_failed_step = NULL; |
|
|
|
index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; |
|
index %= REC_FAILED_NUM; |
|
step = suspend_stats.failed_steps[index]; |
|
last_failed_step = suspend_step_name(step); |
|
|
|
return sprintf(buf, "%s\n", last_failed_step); |
|
} |
|
static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); |
|
|
|
static struct attribute *suspend_attrs[] = { |
|
&success.attr, |
|
&fail.attr, |
|
&failed_freeze.attr, |
|
&failed_prepare.attr, |
|
&failed_suspend.attr, |
|
&failed_suspend_late.attr, |
|
&failed_suspend_noirq.attr, |
|
&failed_resume.attr, |
|
&failed_resume_early.attr, |
|
&failed_resume_noirq.attr, |
|
&last_failed_dev.attr, |
|
&last_failed_errno.attr, |
|
&last_failed_step.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group suspend_attr_group = { |
|
.name = "suspend_stats", |
|
.attrs = suspend_attrs, |
|
}; |
|
|
|
#ifdef CONFIG_DEBUG_FS |
|
static int suspend_stats_show(struct seq_file *s, void *unused) |
|
{ |
|
int i, index, last_dev, last_errno, last_step; |
|
|
|
last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; |
|
last_dev %= REC_FAILED_NUM; |
|
last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; |
|
last_errno %= REC_FAILED_NUM; |
|
last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; |
|
last_step %= REC_FAILED_NUM; |
|
seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" |
|
"%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", |
|
"success", suspend_stats.success, |
|
"fail", suspend_stats.fail, |
|
"failed_freeze", suspend_stats.failed_freeze, |
|
"failed_prepare", suspend_stats.failed_prepare, |
|
"failed_suspend", suspend_stats.failed_suspend, |
|
"failed_suspend_late", |
|
suspend_stats.failed_suspend_late, |
|
"failed_suspend_noirq", |
|
suspend_stats.failed_suspend_noirq, |
|
"failed_resume", suspend_stats.failed_resume, |
|
"failed_resume_early", |
|
suspend_stats.failed_resume_early, |
|
"failed_resume_noirq", |
|
suspend_stats.failed_resume_noirq); |
|
seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", |
|
suspend_stats.failed_devs[last_dev]); |
|
for (i = 1; i < REC_FAILED_NUM; i++) { |
|
index = last_dev + REC_FAILED_NUM - i; |
|
index %= REC_FAILED_NUM; |
|
seq_printf(s, "\t\t\t%-s\n", |
|
suspend_stats.failed_devs[index]); |
|
} |
|
seq_printf(s, " last_failed_errno:\t%-d\n", |
|
suspend_stats.errno[last_errno]); |
|
for (i = 1; i < REC_FAILED_NUM; i++) { |
|
index = last_errno + REC_FAILED_NUM - i; |
|
index %= REC_FAILED_NUM; |
|
seq_printf(s, "\t\t\t%-d\n", |
|
suspend_stats.errno[index]); |
|
} |
|
seq_printf(s, " last_failed_step:\t%-s\n", |
|
suspend_step_name( |
|
suspend_stats.failed_steps[last_step])); |
|
for (i = 1; i < REC_FAILED_NUM; i++) { |
|
index = last_step + REC_FAILED_NUM - i; |
|
index %= REC_FAILED_NUM; |
|
seq_printf(s, "\t\t\t%-s\n", |
|
suspend_step_name( |
|
suspend_stats.failed_steps[index])); |
|
} |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(suspend_stats); |
|
|
|
static int __init pm_debugfs_init(void) |
|
{ |
|
debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, |
|
NULL, NULL, &suspend_stats_fops); |
|
return 0; |
|
} |
|
|
|
late_initcall(pm_debugfs_init); |
|
#endif /* CONFIG_DEBUG_FS */ |
|
|
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
#ifdef CONFIG_PM_SLEEP_DEBUG |
|
/* |
|
* pm_print_times: print time taken by devices to suspend and resume. |
|
* |
|
* show() returns whether printing of suspend and resume times is enabled. |
|
* store() accepts 0 or 1. 0 disables printing and 1 enables it. |
|
*/ |
|
bool pm_print_times_enabled; |
|
|
|
static ssize_t pm_print_times_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", pm_print_times_enabled); |
|
} |
|
|
|
static ssize_t pm_print_times_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned long val; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
if (val > 1) |
|
return -EINVAL; |
|
|
|
pm_print_times_enabled = !!val; |
|
return n; |
|
} |
|
|
|
power_attr(pm_print_times); |
|
|
|
static inline void pm_print_times_init(void) |
|
{ |
|
pm_print_times_enabled = !!initcall_debug; |
|
} |
|
|
|
static ssize_t pm_wakeup_irq_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA; |
|
} |
|
|
|
power_attr_ro(pm_wakeup_irq); |
|
|
|
bool pm_debug_messages_on __read_mostly; |
|
|
|
static ssize_t pm_debug_messages_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", pm_debug_messages_on); |
|
} |
|
|
|
static ssize_t pm_debug_messages_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned long val; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
if (val > 1) |
|
return -EINVAL; |
|
|
|
pm_debug_messages_on = !!val; |
|
return n; |
|
} |
|
|
|
power_attr(pm_debug_messages); |
|
|
|
static int __init pm_debug_messages_setup(char *str) |
|
{ |
|
pm_debug_messages_on = true; |
|
return 1; |
|
} |
|
__setup("pm_debug_messages", pm_debug_messages_setup); |
|
|
|
/** |
|
* __pm_pr_dbg - Print a suspend debug message to the kernel log. |
|
* @defer: Whether or not to use printk_deferred() to print the message. |
|
* @fmt: Message format. |
|
* |
|
* The message will be emitted if enabled through the pm_debug_messages |
|
* sysfs attribute. |
|
*/ |
|
void __pm_pr_dbg(bool defer, const char *fmt, ...) |
|
{ |
|
struct va_format vaf; |
|
va_list args; |
|
|
|
if (!pm_debug_messages_on) |
|
return; |
|
|
|
va_start(args, fmt); |
|
|
|
vaf.fmt = fmt; |
|
vaf.va = &args; |
|
|
|
if (defer) |
|
printk_deferred(KERN_DEBUG "PM: %pV", &vaf); |
|
else |
|
printk(KERN_DEBUG "PM: %pV", &vaf); |
|
|
|
va_end(args); |
|
} |
|
|
|
#else /* !CONFIG_PM_SLEEP_DEBUG */ |
|
static inline void pm_print_times_init(void) {} |
|
#endif /* CONFIG_PM_SLEEP_DEBUG */ |
|
|
|
struct kobject *power_kobj; |
|
|
|
/* |
|
* state - control system sleep states. |
|
* |
|
* show() returns available sleep state labels, which may be "mem", "standby", |
|
* "freeze" and "disk" (hibernation). |
|
* See Documentation/admin-guide/pm/sleep-states.rst for a description of |
|
* what they mean. |
|
* |
|
* store() accepts one of those strings, translates it into the proper |
|
* enumerated value, and initiates a suspend transition. |
|
*/ |
|
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
char *s = buf; |
|
#ifdef CONFIG_SUSPEND |
|
suspend_state_t i; |
|
|
|
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) |
|
if (pm_states[i]) |
|
s += sprintf(s,"%s ", pm_states[i]); |
|
|
|
#endif |
|
if (hibernation_available()) |
|
s += sprintf(s, "disk "); |
|
if (s != buf) |
|
/* convert the last space to a newline */ |
|
*(s-1) = '\n'; |
|
return (s - buf); |
|
} |
|
|
|
static suspend_state_t decode_state(const char *buf, size_t n) |
|
{ |
|
#ifdef CONFIG_SUSPEND |
|
suspend_state_t state; |
|
#endif |
|
char *p; |
|
int len; |
|
|
|
p = memchr(buf, '\n', n); |
|
len = p ? p - buf : n; |
|
|
|
/* Check hibernation first. */ |
|
if (len == 4 && str_has_prefix(buf, "disk")) |
|
return PM_SUSPEND_MAX; |
|
|
|
#ifdef CONFIG_SUSPEND |
|
for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
|
const char *label = pm_states[state]; |
|
|
|
if (label && len == strlen(label) && !strncmp(buf, label, len)) |
|
return state; |
|
} |
|
#endif |
|
|
|
return PM_SUSPEND_ON; |
|
} |
|
|
|
static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
suspend_state_t state; |
|
int error; |
|
|
|
error = pm_autosleep_lock(); |
|
if (error) |
|
return error; |
|
|
|
if (pm_autosleep_state() > PM_SUSPEND_ON) { |
|
error = -EBUSY; |
|
goto out; |
|
} |
|
|
|
state = decode_state(buf, n); |
|
if (state < PM_SUSPEND_MAX) { |
|
if (state == PM_SUSPEND_MEM) |
|
state = mem_sleep_current; |
|
|
|
error = pm_suspend(state); |
|
} else if (state == PM_SUSPEND_MAX) { |
|
error = hibernate(); |
|
} else { |
|
error = -EINVAL; |
|
} |
|
|
|
out: |
|
pm_autosleep_unlock(); |
|
return error ? error : n; |
|
} |
|
|
|
power_attr(state); |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
/* |
|
* The 'wakeup_count' attribute, along with the functions defined in |
|
* drivers/base/power/wakeup.c, provides a means by which wakeup events can be |
|
* handled in a non-racy way. |
|
* |
|
* If a wakeup event occurs when the system is in a sleep state, it simply is |
|
* woken up. In turn, if an event that would wake the system up from a sleep |
|
* state occurs when it is undergoing a transition to that sleep state, the |
|
* transition should be aborted. Moreover, if such an event occurs when the |
|
* system is in the working state, an attempt to start a transition to the |
|
* given sleep state should fail during certain period after the detection of |
|
* the event. Using the 'state' attribute alone is not sufficient to satisfy |
|
* these requirements, because a wakeup event may occur exactly when 'state' |
|
* is being written to and may be delivered to user space right before it is |
|
* frozen, so the event will remain only partially processed until the system is |
|
* woken up by another event. In particular, it won't cause the transition to |
|
* a sleep state to be aborted. |
|
* |
|
* This difficulty may be overcome if user space uses 'wakeup_count' before |
|
* writing to 'state'. It first should read from 'wakeup_count' and store |
|
* the read value. Then, after carrying out its own preparations for the system |
|
* transition to a sleep state, it should write the stored value to |
|
* 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
|
* 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
|
* is allowed to write to 'state', but the transition will be aborted if there |
|
* are any wakeup events detected after 'wakeup_count' was written to. |
|
*/ |
|
|
|
static ssize_t wakeup_count_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
unsigned int val; |
|
|
|
return pm_get_wakeup_count(&val, true) ? |
|
sprintf(buf, "%u\n", val) : -EINTR; |
|
} |
|
|
|
static ssize_t wakeup_count_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned int val; |
|
int error; |
|
|
|
error = pm_autosleep_lock(); |
|
if (error) |
|
return error; |
|
|
|
if (pm_autosleep_state() > PM_SUSPEND_ON) { |
|
error = -EBUSY; |
|
goto out; |
|
} |
|
|
|
error = -EINVAL; |
|
if (sscanf(buf, "%u", &val) == 1) { |
|
if (pm_save_wakeup_count(val)) |
|
error = n; |
|
else |
|
pm_print_active_wakeup_sources(); |
|
} |
|
|
|
out: |
|
pm_autosleep_unlock(); |
|
return error; |
|
} |
|
|
|
power_attr(wakeup_count); |
|
|
|
#ifdef CONFIG_PM_AUTOSLEEP |
|
static ssize_t autosleep_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
suspend_state_t state = pm_autosleep_state(); |
|
|
|
if (state == PM_SUSPEND_ON) |
|
return sprintf(buf, "off\n"); |
|
|
|
#ifdef CONFIG_SUSPEND |
|
if (state < PM_SUSPEND_MAX) |
|
return sprintf(buf, "%s\n", pm_states[state] ? |
|
pm_states[state] : "error"); |
|
#endif |
|
#ifdef CONFIG_HIBERNATION |
|
return sprintf(buf, "disk\n"); |
|
#else |
|
return sprintf(buf, "error"); |
|
#endif |
|
} |
|
|
|
static ssize_t autosleep_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
suspend_state_t state = decode_state(buf, n); |
|
int error; |
|
|
|
if (state == PM_SUSPEND_ON |
|
&& strcmp(buf, "off") && strcmp(buf, "off\n")) |
|
return -EINVAL; |
|
|
|
if (state == PM_SUSPEND_MEM) |
|
state = mem_sleep_current; |
|
|
|
error = pm_autosleep_set_state(state); |
|
return error ? error : n; |
|
} |
|
|
|
power_attr(autosleep); |
|
#endif /* CONFIG_PM_AUTOSLEEP */ |
|
|
|
#ifdef CONFIG_PM_WAKELOCKS |
|
static ssize_t wake_lock_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return pm_show_wakelocks(buf, true); |
|
} |
|
|
|
static ssize_t wake_lock_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
int error = pm_wake_lock(buf); |
|
return error ? error : n; |
|
} |
|
|
|
power_attr(wake_lock); |
|
|
|
static ssize_t wake_unlock_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return pm_show_wakelocks(buf, false); |
|
} |
|
|
|
static ssize_t wake_unlock_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
int error = pm_wake_unlock(buf); |
|
return error ? error : n; |
|
} |
|
|
|
power_attr(wake_unlock); |
|
|
|
#endif /* CONFIG_PM_WAKELOCKS */ |
|
#endif /* CONFIG_PM_SLEEP */ |
|
|
|
#ifdef CONFIG_PM_TRACE |
|
int pm_trace_enabled; |
|
|
|
static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", pm_trace_enabled); |
|
} |
|
|
|
static ssize_t |
|
pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
int val; |
|
|
|
if (sscanf(buf, "%d", &val) == 1) { |
|
pm_trace_enabled = !!val; |
|
if (pm_trace_enabled) { |
|
pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" |
|
"PM: Correct system time has to be restored manually after resume.\n"); |
|
} |
|
return n; |
|
} |
|
return -EINVAL; |
|
} |
|
|
|
power_attr(pm_trace); |
|
|
|
static ssize_t pm_trace_dev_match_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return show_trace_dev_match(buf, PAGE_SIZE); |
|
} |
|
|
|
power_attr_ro(pm_trace_dev_match); |
|
|
|
#endif /* CONFIG_PM_TRACE */ |
|
|
|
#ifdef CONFIG_FREEZER |
|
static ssize_t pm_freeze_timeout_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%u\n", freeze_timeout_msecs); |
|
} |
|
|
|
static ssize_t pm_freeze_timeout_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t n) |
|
{ |
|
unsigned long val; |
|
|
|
if (kstrtoul(buf, 10, &val)) |
|
return -EINVAL; |
|
|
|
freeze_timeout_msecs = val; |
|
return n; |
|
} |
|
|
|
power_attr(pm_freeze_timeout); |
|
|
|
#endif /* CONFIG_FREEZER*/ |
|
|
|
static struct attribute * g[] = { |
|
&state_attr.attr, |
|
#ifdef CONFIG_PM_TRACE |
|
&pm_trace_attr.attr, |
|
&pm_trace_dev_match_attr.attr, |
|
#endif |
|
#ifdef CONFIG_PM_SLEEP |
|
&pm_async_attr.attr, |
|
&wakeup_count_attr.attr, |
|
#ifdef CONFIG_SUSPEND |
|
&mem_sleep_attr.attr, |
|
&sync_on_suspend_attr.attr, |
|
#endif |
|
#ifdef CONFIG_PM_AUTOSLEEP |
|
&autosleep_attr.attr, |
|
#endif |
|
#ifdef CONFIG_PM_WAKELOCKS |
|
&wake_lock_attr.attr, |
|
&wake_unlock_attr.attr, |
|
#endif |
|
#ifdef CONFIG_PM_SLEEP_DEBUG |
|
&pm_test_attr.attr, |
|
&pm_print_times_attr.attr, |
|
&pm_wakeup_irq_attr.attr, |
|
&pm_debug_messages_attr.attr, |
|
#endif |
|
#endif |
|
#ifdef CONFIG_FREEZER |
|
&pm_freeze_timeout_attr.attr, |
|
#endif |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group attr_group = { |
|
.attrs = g, |
|
}; |
|
|
|
static const struct attribute_group *attr_groups[] = { |
|
&attr_group, |
|
#ifdef CONFIG_PM_SLEEP |
|
&suspend_attr_group, |
|
#endif |
|
NULL, |
|
}; |
|
|
|
struct workqueue_struct *pm_wq; |
|
EXPORT_SYMBOL_GPL(pm_wq); |
|
|
|
static int __init pm_start_workqueue(void) |
|
{ |
|
pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
|
|
|
return pm_wq ? 0 : -ENOMEM; |
|
} |
|
|
|
static int __init pm_init(void) |
|
{ |
|
int error = pm_start_workqueue(); |
|
if (error) |
|
return error; |
|
hibernate_image_size_init(); |
|
hibernate_reserved_size_init(); |
|
pm_states_init(); |
|
power_kobj = kobject_create_and_add("power", NULL); |
|
if (!power_kobj) |
|
return -ENOMEM; |
|
error = sysfs_create_groups(power_kobj, attr_groups); |
|
if (error) |
|
return error; |
|
pm_print_times_init(); |
|
return pm_autosleep_init(); |
|
} |
|
|
|
core_initcall(pm_init);
|
|
|