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-rw-r--r--kernel/power/main.c171
1 files changed, 145 insertions, 26 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index efc08360e62..6a6d5eb3524 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -24,13 +24,112 @@
#include "power.h"
-BLOCKING_NOTIFIER_HEAD(pm_chain_head);
-
DEFINE_MUTEX(pm_mutex);
unsigned int pm_flags;
EXPORT_SYMBOL(pm_flags);
+#ifdef CONFIG_PM_SLEEP
+
+/* 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(unsigned long val)
+{
+ return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
+ == NOTIFY_BAD) ? -EINVAL : 0;
+}
+
+#ifdef CONFIG_PM_DEBUG
+int pm_test_level = TEST_NONE;
+
+static int suspend_test(int level)
+{
+ if (pm_test_level == level) {
+ printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ return 1;
+ }
+ return 0;
+}
+
+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;
+
+ mutex_lock(&pm_mutex);
+
+ 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;
+ }
+
+ mutex_unlock(&pm_mutex);
+
+ return error ? error : n;
+}
+
+power_attr(pm_test);
+#else /* !CONFIG_PM_DEBUG */
+static inline int suspend_test(int level) { return 0; }
+#endif /* !CONFIG_PM_DEBUG */
+
+#endif /* CONFIG_PM_SLEEP */
+
#ifdef CONFIG_SUSPEND
/* This is just an arbitrary number */
@@ -76,13 +175,13 @@ static int suspend_prepare(void)
if (!suspend_ops || !suspend_ops->enter)
return -EPERM;
+ pm_prepare_console();
+
error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
if (error)
goto Finish;
- pm_prepare_console();
-
- if (freeze_processes()) {
+ if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
@@ -100,10 +199,10 @@ static int suspend_prepare(void)
return 0;
Thaw:
- thaw_processes();
- pm_restore_console();
+ suspend_thaw_processes();
Finish:
pm_notifier_call_chain(PM_POST_SUSPEND);
+ pm_restore_console();
return error;
}
@@ -133,10 +232,13 @@ static int suspend_enter(suspend_state_t state)
BUG_ON(!irqs_disabled());
if ((error = device_power_down(PMSG_SUSPEND))) {
- printk(KERN_ERR "Some devices failed to power down\n");
+ printk(KERN_ERR "PM: Some devices failed to power down\n");
goto Done;
}
- error = suspend_ops->enter(state);
+
+ if (!suspend_test(TEST_CORE))
+ error = suspend_ops->enter(state);
+
device_power_up();
Done:
arch_suspend_enable_irqs();
@@ -145,8 +247,8 @@ static int suspend_enter(suspend_state_t state)
}
/**
- * suspend_devices_and_enter - suspend devices and enter the desired system sleep
- * state.
+ * suspend_devices_and_enter - suspend devices and enter the desired system
+ * sleep state.
* @state: state to enter
*/
int suspend_devices_and_enter(suspend_state_t state)
@@ -156,33 +258,45 @@ int suspend_devices_and_enter(suspend_state_t state)
if (!suspend_ops)
return -ENOSYS;
- if (suspend_ops->set_target) {
- error = suspend_ops->set_target(state);
+ if (suspend_ops->begin) {
+ error = suspend_ops->begin(state);
if (error)
- return error;
+ goto Close;
}
suspend_console();
error = device_suspend(PMSG_SUSPEND);
if (error) {
- printk(KERN_ERR "Some devices failed to suspend\n");
+ printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Resume_console;
}
+
+ if (suspend_test(TEST_DEVICES))
+ goto Resume_devices;
+
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
if (error)
goto Resume_devices;
}
+
+ if (suspend_test(TEST_PLATFORM))
+ goto Finish;
+
error = disable_nonboot_cpus();
- if (!error)
+ if (!error && !suspend_test(TEST_CPUS))
suspend_enter(state);
enable_nonboot_cpus();
+ Finish:
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices:
device_resume();
Resume_console:
resume_console();
+ Close:
+ if (suspend_ops->end)
+ suspend_ops->end();
return error;
}
@@ -194,9 +308,9 @@ int suspend_devices_and_enter(suspend_state_t state)
*/
static void suspend_finish(void)
{
- thaw_processes();
- pm_restore_console();
+ suspend_thaw_processes();
pm_notifier_call_chain(PM_POST_SUSPEND);
+ pm_restore_console();
}
@@ -238,17 +352,22 @@ static int enter_state(suspend_state_t state)
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
- printk("Syncing filesystems ... ");
+ printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
- if ((error = suspend_prepare()))
+ error = suspend_prepare();
+ if (error)
goto Unlock;
+ if (suspend_test(TEST_FREEZER))
+ goto Finish;
+
pr_debug("PM: Entering %s sleep\n", pm_states[state]);
error = suspend_devices_and_enter(state);
+ Finish:
pr_debug("PM: Finishing wakeup.\n");
suspend_finish();
Unlock:
@@ -369,18 +488,18 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
}
power_attr(pm_trace);
+#endif /* CONFIG_PM_TRACE */
static struct attribute * g[] = {
&state_attr.attr,
+#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
+#endif
+#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
+ &pm_test_attr.attr,
+#endif
NULL,
};
-#else
-static struct attribute * g[] = {
- &state_attr.attr,
- NULL,
-};
-#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,