1 files changed, 422 insertions, 290 deletions

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 6a6d5eb3524..8e90f330f13 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -3,32 +3,23 @@
  *
  * Copyright (c) 2003 Patrick Mochel
  * Copyright (c) 2003 Open Source Development Lab
- * 
+ *
  * This file is released under the GPLv2
  *
  */
 
-#include <linux/module.h>
-#include <linux/suspend.h>
+#include <linux/export.h>
 #include <linux/kobject.h>
 #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/resume-trace.h>
-#include <linux/freezer.h>
-#include <linux/vmstat.h>
-#include <linux/syscalls.h>
+#include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 #include "power.h"
 
 DEFINE_MUTEX(pm_mutex);
 
-unsigned int pm_flags;
-EXPORT_SYMBOL(pm_flags);
-
 #ifdef CONFIG_PM_SLEEP
 
 /* Routines for PM-transition notifications */
@@ -49,23 +40,40 @@ 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;
+	int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL);
+
+	return notifier_to_errno(ret);
 }
 
-#ifdef CONFIG_PM_DEBUG
-int pm_test_level = TEST_NONE;
+/* If set, devices may be suspended and resumed asynchronously. */
+int pm_async_enabled = 1;
 
-static int suspend_test(int level)
+static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
+			     char *buf)
 {
-	if (pm_test_level == level) {
-		printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
-		mdelay(5000);
-		return 1;
-	}
-	return 0;
+	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_PM_DEBUG
+int pm_test_level = TEST_NONE;
+
 static const char * const pm_tests[__TEST_AFTER_LAST] = {
 	[TEST_NONE] = "none",
 	[TEST_CORE] = "core",
@@ -108,7 +116,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 	p = memchr(buf, '\n', n);
 	len = p ? p - buf : n;
 
-	mutex_lock(&pm_mutex);
+	lock_system_sleep();
 
 	level = TEST_FIRST;
 	for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
@@ -118,352 +126,391 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 			break;
 		}
 
-	mutex_unlock(&pm_mutex);
+	unlock_system_sleep();
 
 	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_DEBUG */
 
-#endif /* CONFIG_PM_SLEEP */
+#ifdef CONFIG_DEBUG_FS
+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 "";
+	}
+}
 
-#ifdef CONFIG_SUSPEND
+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]));
+	}
 
-/* This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
+	return 0;
+}
 
-static struct platform_suspend_ops *suspend_ops;
+static int suspend_stats_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, suspend_stats_show, NULL);
+}
 
-/**
- *	suspend_set_ops - Set the global suspend method table.
- *	@ops:	Pointer to ops structure.
- */
+static const struct file_operations suspend_stats_operations = {
+	.open           = suspend_stats_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release        = single_release,
+};
 
-void suspend_set_ops(struct platform_suspend_ops *ops)
+static int __init pm_debugfs_init(void)
 {
-	mutex_lock(&pm_mutex);
-	suspend_ops = ops;
-	mutex_unlock(&pm_mutex);
+	debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO,
+			NULL, NULL, &suspend_stats_operations);
+	return 0;
 }
 
-/**
- * suspend_valid_only_mem - generic memory-only valid callback
+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.
  *
- * 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.
+ * show() returns whether printing of suspend and resume times is enabled.
+ * store() accepts 0 or 1.  0 disables printing and 1 enables it.
  */
-int suspend_valid_only_mem(suspend_state_t state)
+bool pm_print_times_enabled;
+
+static ssize_t pm_print_times_show(struct kobject *kobj,
+				   struct kobj_attribute *attr, char *buf)
 {
-	return state == PM_SUSPEND_MEM;
+	return sprintf(buf, "%d\n", pm_print_times_enabled);
 }
 
-/**
- *	suspend_prepare - Do prep work before entering low-power state.
- *
- *	This is common code that is called for each state that we're entering.
- *	Run suspend notifiers, allocate a console and stop all processes.
- */
-static int suspend_prepare(void)
+static ssize_t pm_print_times_store(struct kobject *kobj,
+				    struct kobj_attribute *attr,
+				    const char *buf, size_t n)
 {
-	int error;
-	unsigned int free_pages;
-
-	if (!suspend_ops || !suspend_ops->enter)
-		return -EPERM;
+	unsigned long val;
 
-	pm_prepare_console();
+	if (kstrtoul(buf, 10, &val))
+		return -EINVAL;
 
-	error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
-	if (error)
-		goto Finish;
+	if (val > 1)
+		return -EINVAL;
 
-	if (suspend_freeze_processes()) {
-		error = -EAGAIN;
-		goto Thaw;
-	}
-
-	free_pages = global_page_state(NR_FREE_PAGES);
-	if (free_pages < FREE_PAGE_NUMBER) {
-		pr_debug("PM: free some memory\n");
-		shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
-		if (nr_free_pages() < FREE_PAGE_NUMBER) {
-			error = -ENOMEM;
-			printk(KERN_ERR "PM: No enough memory\n");
-		}
-	}
-	if (!error)
-		return 0;
-
- Thaw:
-	suspend_thaw_processes();
- Finish:
-	pm_notifier_call_chain(PM_POST_SUSPEND);
-	pm_restore_console();
-	return error;
+	pm_print_times_enabled = !!val;
+	return n;
 }
 
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
-{
-	local_irq_disable();
-}
+power_attr(pm_print_times);
 
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
+static inline void pm_print_times_init(void)
 {
-	local_irq_enable();
+	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;
 
 /**
- *	suspend_enter - enter the desired system sleep state.
- *	@state:		state to enter
+ * state - control system sleep states.
+ *
+ * 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.
  *
- *	This function should be called after devices have been suspended.
+ * store() accepts one of those strings, translates it into the proper
+ * enumerated value, and initiates a suspend transition.
  */
-static int suspend_enter(suspend_state_t state)
+static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
+			  char *buf)
 {
-	int error = 0;
-
-	arch_suspend_disable_irqs();
-	BUG_ON(!irqs_disabled());
-
-	if ((error = device_power_down(PMSG_SUSPEND))) {
-		printk(KERN_ERR "PM: Some devices failed to power down\n");
-		goto Done;
-	}
+	char *s = buf;
+#ifdef CONFIG_SUSPEND
+	suspend_state_t i;
 
-	if (!suspend_test(TEST_CORE))
-		error = suspend_ops->enter(state);
+	for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
+		if (pm_states[i].state)
+			s += sprintf(s,"%s ", pm_states[i].label);
 
-	device_power_up();
- Done:
-	arch_suspend_enable_irqs();
-	BUG_ON(irqs_disabled());
-	return error;
+#endif
+	if (hibernation_available())
+		s += sprintf(s, "disk ");
+	if (s != buf)
+		/* convert the last space to a newline */
+		*(s-1) = '\n';
+	return (s - buf);
 }
 
-/**
- *	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)
+static suspend_state_t decode_state(const char *buf, size_t n)
 {
-	int error;
-
-	if (!suspend_ops)
-		return -ENOSYS;
+#ifdef CONFIG_SUSPEND
+	suspend_state_t state = PM_SUSPEND_MIN;
+	struct pm_sleep_state *s;
+#endif
+	char *p;
+	int len;
 
-	if (suspend_ops->begin) {
-		error = suspend_ops->begin(state);
-		if (error)
-			goto Close;
-	}
-	suspend_console();
-	error = device_suspend(PMSG_SUSPEND);
-	if (error) {
-		printk(KERN_ERR "PM: Some devices failed to suspend\n");
-		goto Resume_console;
-	}
+	p = memchr(buf, '\n', n);
+	len = p ? p - buf : n;
 
-	if (suspend_test(TEST_DEVICES))
-		goto Resume_devices;
+	/* Check hibernation first. */
+	if (len == 4 && !strncmp(buf, "disk", len))
+		return PM_SUSPEND_MAX;
 
-	if (suspend_ops->prepare) {
-		error = suspend_ops->prepare();
-		if (error)
-			goto Resume_devices;
-	}
+#ifdef CONFIG_SUSPEND
+	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
 
-	if (suspend_test(TEST_PLATFORM))
-		goto Finish;
-
-	error = disable_nonboot_cpus();
-	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;
+	return PM_SUSPEND_ON;
 }
 
-/**
- *	suspend_finish - Do final work before exiting suspend sequence.
- *
- *	Call platform code to clean up, restart processes, and free the 
- *	console that we've allocated. This is not called for suspend-to-disk.
- */
-static void suspend_finish(void)
+static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
+			   const char *buf, size_t n)
 {
-	suspend_thaw_processes();
-	pm_notifier_call_chain(PM_POST_SUSPEND);
-	pm_restore_console();
-}
-
+	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;
+	}
 
-static const char * const pm_states[PM_SUSPEND_MAX] = {
-	[PM_SUSPEND_STANDBY]	= "standby",
-	[PM_SUSPEND_MEM]	= "mem",
-};
+	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;
 
-static inline int valid_state(suspend_state_t state)
-{
-	/* All states need lowlevel support and need to be valid
-	 * to the lowlevel implementation, no valid callback
-	 * implies that none are valid. */
-	if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
-		return 0;
-	return 1;
+ out:
+	pm_autosleep_unlock();
+	return error ? error : n;
 }
 
+power_attr(state);
 
-/**
- *	enter_state - Do common work of entering low-power state.
- *	@state:		pm_state structure for state we're entering.
+#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.
  *
- *	Make sure we're the only ones trying to enter a sleep state. Fail
- *	if someone has beat us to it, since we don't want anything weird to
- *	happen when we wake up.
- *	Then, do the setup for suspend, enter the state, and cleaup (after
- *	we've woken up).
+ * 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 int enter_state(suspend_state_t state)
-{
-	int error;
 
-	if (!valid_state(state))
-		return -ENODEV;
+static ssize_t wakeup_count_show(struct kobject *kobj,
+				struct kobj_attribute *attr,
+				char *buf)
+{
+	unsigned int val;
 
-	if (!mutex_trylock(&pm_mutex))
-		return -EBUSY;
+	return pm_get_wakeup_count(&val, true) ?
+		sprintf(buf, "%u\n", val) : -EINTR;
+}
 
-	printk(KERN_INFO "PM: Syncing filesystems ... ");
-	sys_sync();
-	printk("done.\n");
+static ssize_t wakeup_count_store(struct kobject *kobj,
+				struct kobj_attribute *attr,
+				const char *buf, size_t n)
+{
+	unsigned int val;
+	int error;
 
-	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
-	error = suspend_prepare();
+	error = pm_autosleep_lock();
 	if (error)
-		goto Unlock;
+		return error;
 
-	if (suspend_test(TEST_FREEZER))
-		goto Finish;
+	if (pm_autosleep_state() > PM_SUSPEND_ON) {
+		error = -EBUSY;
+		goto out;
+	}
 
-	pr_debug("PM: Entering %s sleep\n", pm_states[state]);
-	error = suspend_devices_and_enter(state);
+	error = -EINVAL;
+	if (sscanf(buf, "%u", &val) == 1) {
+		if (pm_save_wakeup_count(val))
+			error = n;
+		else
+			pm_print_active_wakeup_sources();
+	}
 
- Finish:
-	pr_debug("PM: Finishing wakeup.\n");
-	suspend_finish();
- Unlock:
-	mutex_unlock(&pm_mutex);
+ out:
+	pm_autosleep_unlock();
 	return error;
 }
 
+power_attr(wakeup_count);
 
-/**
- *	pm_suspend - Externally visible function for suspending system.
- *	@state:		Enumerated value of state to enter.
- *
- *	Determine whether or not value is within range, get state 
- *	structure, and enter (above).
- */
-
-int pm_suspend(suspend_state_t state)
+#ifdef CONFIG_PM_AUTOSLEEP
+static ssize_t autosleep_show(struct kobject *kobj,
+			      struct kobj_attribute *attr,
+			      char *buf)
 {
-	if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
-		return enter_state(state);
-	return -EINVAL;
-}
+	suspend_state_t state = pm_autosleep_state();
 
-EXPORT_SYMBOL(pm_suspend);
+	if (state == PM_SUSPEND_ON)
+		return sprintf(buf, "off\n");
 
-#endif /* CONFIG_SUSPEND */
-
-struct kobject *power_kobj;
-
-/**
- *	state - control system power state.
- *
- *	show() returns what states are supported, which is hard-coded to
- *	'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
- *	'disk' (Suspend-to-Disk).
- *
- *	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;
-
-	for (i = 0; i < PM_SUSPEND_MAX; i++) {
-		if (pm_states[i] && valid_state(i))
-			s += sprintf(s,"%s ", pm_states[i]);
-	}
+	if (state < PM_SUSPEND_MAX)
+		return sprintf(buf, "%s\n", pm_states[state].state ?
+					pm_states[state].label : "error");
 #endif
 #ifdef CONFIG_HIBERNATION
-	s += sprintf(s, "%s\n", "disk");
+	return sprintf(buf, "disk\n");
 #else
-	if (s != buf)
-		/* convert the last space to a newline */
-		*(s-1) = '\n';
+	return sprintf(buf, "error");
 #endif
-	return (s - buf);
 }
 
-static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
-			   const char *buf, size_t n)
+static ssize_t autosleep_store(struct kobject *kobj,
+			       struct kobj_attribute *attr,
+			       const char *buf, size_t n)
 {
-#ifdef CONFIG_SUSPEND
-	suspend_state_t state = PM_SUSPEND_STANDBY;
-	const char * const *s;
-#endif
-	char *p;
-	int len;
-	int error = -EINVAL;
+	suspend_state_t state = decode_state(buf, n);
+	int error;
 
-	p = memchr(buf, '\n', n);
-	len = p ? p - buf : n;
+	if (state == PM_SUSPEND_ON
+	    && strcmp(buf, "off") && strcmp(buf, "off\n"))
+		return -EINVAL;
 
-	/* First, check if we are requested to hibernate */
-	if (len == 4 && !strncmp(buf, "disk", len)) {
-		error = hibernate();
-  goto Exit;
-	}
+	error = pm_autosleep_set_state(state);
+	return error ? error : n;
+}
 
-#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);
-#endif
+power_attr(autosleep);
+#endif /* CONFIG_PM_AUTOSLEEP */
 
- Exit:
+#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(state);
+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;
@@ -482,22 +529,85 @@ 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;
 }
 
 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);
+}
+
+static ssize_t
+pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr,
+			 const char *buf, size_t n)
+{
+	return -EINVAL;
+}
+
+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
 	&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_PM_AUTOSLEEP
+	&autosleep_attr.attr,
 #endif
-#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
+#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,
 };
 
@@ -505,13 +615,35 @@ static struct attribute_group attr_group = {
 	.attrs = g,
 };
 
+#ifdef CONFIG_PM_RUNTIME
+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;
+}
+#else
+static inline int pm_start_workqueue(void) { return 0; }
+#endif
 
 static int __init pm_init(void)
 {
+	int error = pm_start_workqueue();
+	if (error)
+		return error;
+	hibernate_image_size_init();
+	hibernate_reserved_size_init();
 	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);