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Diffstat (limited to 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c287
1 files changed, 242 insertions, 45 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 9824b41e5a1..8e90f330f13 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -59,7 +59,7 @@ static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
{
unsigned long val;
- if (strict_strtoul(buf, 10, &val))
+ if (kstrtoul(buf, 10, &val))
return -EINVAL;
if (val > 1)
@@ -165,16 +165,20 @@ static int suspend_stats_show(struct seq_file *s, void *unused)
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",
+ 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",
@@ -231,76 +235,130 @@ late_initcall(pm_debugfs_init);
#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;
+}
+#else /* !CONFIG_PP_SLEEP_DEBUG */
+static inline void pm_print_times_init(void) {}
+#endif /* CONFIG_PM_SLEEP_DEBUG */
+
struct kobject *power_kobj;
/**
- * state - control system power state.
+ * state - control system sleep states.
*
- * show() returns what states are supported, which is hard-coded to
- * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
- * 'disk' (Suspend-to-Disk).
+ * show() returns available sleep state labels, which may be "mem", "standby",
+ * "freeze" and "disk" (hibernation). See Documentation/power/states.txt 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.
+ * 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
- int i;
+ suspend_state_t i;
+
+ for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
+ if (pm_states[i].state)
+ s += sprintf(s,"%s ", pm_states[i].label);
- for (i = 0; i < PM_SUSPEND_MAX; i++) {
- if (pm_states[i] && valid_state(i))
- s += sprintf(s,"%s ", pm_states[i]);
- }
#endif
-#ifdef CONFIG_HIBERNATION
- s += sprintf(s, "%s\n", "disk");
-#else
+ if (hibernation_available())
+ s += sprintf(s, "disk ");
if (s != buf)
/* convert the last space to a newline */
*(s-1) = '\n';
-#endif
return (s - buf);
}
-static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
- const char *buf, size_t n)
+static suspend_state_t decode_state(const char *buf, size_t n)
{
#ifdef CONFIG_SUSPEND
- suspend_state_t state = PM_SUSPEND_STANDBY;
- const char * const *s;
+ suspend_state_t state = PM_SUSPEND_MIN;
+ struct pm_sleep_state *s;
#endif
char *p;
int len;
- int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
- /* First, check if we are requested to hibernate */
- if (len == 4 && !strncmp(buf, "disk", len)) {
- error = hibernate();
- goto Exit;
- }
+ /* Check hibernation first. */
+ if (len == 4 && !strncmp(buf, "disk", len))
+ return PM_SUSPEND_MAX;
#ifdef CONFIG_SUSPEND
- for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
- if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
- break;
- }
- if (state < PM_SUSPEND_MAX && *s) {
- error = enter_state(state);
- if (error) {
- suspend_stats.fail++;
- dpm_save_failed_errno(error);
- } else
- suspend_stats.success++;
- }
+ for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)
+ if (s->state && len == strlen(s->label)
+ && !strncmp(buf, s->label, len))
+ return s->state;
#endif
- Exit:
+ 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)
+ error = pm_suspend(state);
+ else if (state == PM_SUSPEND_MAX)
+ error = hibernate();
+ else
+ error = -EINVAL;
+
+ out:
+ pm_autosleep_unlock();
return error ? error : n;
}
@@ -341,7 +399,8 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
{
unsigned int val;
- return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR;
+ return pm_get_wakeup_count(&val, true) ?
+ sprintf(buf, "%u\n", val) : -EINTR;
}
static ssize_t wakeup_count_store(struct kobject *kobj,
@@ -349,15 +408,108 @@ static ssize_t wakeup_count_store(struct kobject *kobj,
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))
- return n;
+ error = n;
+ else
+ pm_print_active_wakeup_sources();
}
- return -EINVAL;
+
+ 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].state ?
+ pm_states[state].label : "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;
+
+ 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
@@ -377,6 +529,10 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
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;
@@ -402,6 +558,30 @@ power_attr(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
@@ -411,9 +591,22 @@ static struct attribute * g[] = {
#ifdef CONFIG_PM_SLEEP
&pm_async_attr.attr,
&wakeup_count_attr.attr,
+#ifdef CONFIG_PM_AUTOSLEEP
+ &autosleep_attr.attr,
+#endif
+#ifdef CONFIG_PM_WAKELOCKS
+ &wake_lock_attr.attr,
+ &wake_unlock_attr.attr,
+#endif
#ifdef CONFIG_PM_DEBUG
&pm_test_attr.attr,
#endif
+#ifdef CONFIG_PM_SLEEP_DEBUG
+ &pm_print_times_attr.attr,
+#endif
+#endif
+#ifdef CONFIG_FREEZER
+ &pm_freeze_timeout_attr.attr,
#endif
NULL,
};
@@ -446,7 +639,11 @@ static int __init pm_init(void)
power_kobj = kobject_create_and_add("power", NULL);
if (!power_kobj)
return -ENOMEM;
- return sysfs_create_group(power_kobj, &attr_group);
+ error = sysfs_create_group(power_kobj, &attr_group);
+ if (error)
+ return error;
+ pm_print_times_init();
+ return pm_autosleep_init();
}
core_initcall(pm_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 17:26:35 +0000