Merge branch 'pm-sleep'

* pm-sleep:
  PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock
  PM / Sleep: Add missing static storage class specifiers in main.c
  PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset
  PM / Hibernate: Print hibernation/thaw progress indicator one line at a time.
  PM / Sleep: Separate printing suspend times from initcall_debug
  PM / Sleep: add knob for printing device resume times
  ftrace: Disable function tracing during suspend/resume and hibernation, again
  PM / Hibernate: Enable suspend to both for in-kernel hibernation.

Documentation/ABI/testing/sysfs-power

@@ -231,3 +231,16 @@ Description:
 		Reads from this file return a string consisting of the names of
 		wakeup sources created with the help of /sys/power/wake_lock
 		that are inactive at the moment, separated with spaces.
+
+What:		/sys/power/pm_print_times
+Date:		May 2012
+Contact:	Sameer Nanda <snanda@chromium.org>
+Description:
+		The /sys/power/pm_print_times file allows user space to
+		control whether the time taken by devices to suspend and
+		resume is printed.  These prints are useful for hunting down
+		devices that take too long to suspend or resume.
+
+		Writing a "1" enables this printing while writing a "0"
+		disables it.  The default value is "0".  Reading from this file
+		will display the current value.

Documentation/power/swsusp.txt

@@ -33,6 +33,11 @@ echo shutdown > /sys/power/disk; echo disk > /sys/power/state
 
 echo platform > /sys/power/disk; echo disk > /sys/power/state
 
+. If you would like to write hibernation image to swap and then suspend
+to RAM (provided your platform supports it), you can try
+
+echo suspend > /sys/power/disk; echo disk > /sys/power/state
+
 . If you have SATA disks, you'll need recent kernels with SATA suspend
 support. For suspend and resume to work, make sure your disk drivers
 are built into kernel -- not modules. [There's way to make

drivers/base/power/main.c

@@ -45,10 +45,10 @@ typedef int (*pm_callback_t)(struct device *);
  */
 
 LIST_HEAD(dpm_list);
-LIST_HEAD(dpm_prepared_list);
-LIST_HEAD(dpm_suspended_list);
-LIST_HEAD(dpm_late_early_list);
-LIST_HEAD(dpm_noirq_list);
+static LIST_HEAD(dpm_prepared_list);
+static LIST_HEAD(dpm_suspended_list);
+static LIST_HEAD(dpm_late_early_list);
+static LIST_HEAD(dpm_noirq_list);
 
 struct suspend_stats suspend_stats;
 static DEFINE_MUTEX(dpm_list_mtx);
@@ -166,7 +166,7 @@ static ktime_t initcall_debug_start(struct device *dev)
 {
 	ktime_t calltime = ktime_set(0, 0);
 
-	if (initcall_debug) {
+	if (pm_print_times_enabled) {
 		pr_info("calling  %s+ @ %i, parent: %s\n",
 			dev_name(dev), task_pid_nr(current),
 			dev->parent ? dev_name(dev->parent) : "none");
@@ -181,7 +181,7 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
 {
 	ktime_t delta, rettime;
 
-	if (initcall_debug) {
+	if (pm_print_times_enabled) {
 		rettime = ktime_get();
 		delta = ktime_sub(rettime, calltime);
 		pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),

drivers/base/power/sysfs.c

@@ -474,6 +474,8 @@ static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
 
 #endif
 
+#ifdef CONFIG_PM_SLEEP
+
 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
@@ -500,6 +502,8 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 }
 
 static DEVICE_ATTR(async, 0644, async_show, async_store);
+
+#endif
 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 
 static struct attribute *power_attrs[] = {

include/linux/suspend.h

@@ -408,6 +408,12 @@ static inline void unlock_system_sleep(void) {}
 
 #endif /* !CONFIG_PM_SLEEP */
 
+#ifdef CONFIG_PM_SLEEP_DEBUG
+extern bool pm_print_times_enabled;
+#else
+#define pm_print_times_enabled	(false)
+#endif
+
 #ifdef CONFIG_PM_AUTOSLEEP
 
 /* kernel/power/autosleep.c */

kernel/power/Kconfig

@@ -175,7 +175,7 @@ config PM_TEST_SUSPEND
 	You probably want to have your system's RTC driver statically
 	linked, ensuring that it's available when this test runs.
 
-config CAN_PM_TRACE
+config PM_SLEEP_DEBUG
 	def_bool y
 	depends on PM_DEBUG && PM_SLEEP
 
@@ -196,7 +196,7 @@ config PM_TRACE
 
 config PM_TRACE_RTC
 	bool "Suspend/resume event tracing"
-	depends on CAN_PM_TRACE
+	depends on PM_SLEEP_DEBUG
 	depends on X86
 	select PM_TRACE
 	---help---

kernel/power/hibernate.c

@@ -5,6 +5,7 @@
  * Copyright (c) 2003 Open Source Development Lab
  * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
  * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
+ * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
  *
  * This file is released under the GPLv2.
  */
@@ -46,6 +47,9 @@ enum {
 	HIBERNATION_PLATFORM,
 	HIBERNATION_SHUTDOWN,
 	HIBERNATION_REBOOT,
+#ifdef CONFIG_SUSPEND
+	HIBERNATION_SUSPEND,
+#endif
 	/* keep last */
 	__HIBERNATION_AFTER_LAST
 };
@@ -354,6 +358,7 @@ int hibernation_snapshot(int platform_mode)
 	}
 
 	suspend_console();
+	ftrace_stop();
 	pm_restrict_gfp_mask();
 
 	error = dpm_suspend(PMSG_FREEZE);
@@ -379,6 +384,7 @@ int hibernation_snapshot(int platform_mode)
 	if (error || !in_suspend)
 		pm_restore_gfp_mask();
 
+	ftrace_start();
 	resume_console();
 	dpm_complete(msg);
 
@@ -481,13 +487,15 @@ int hibernation_restore(int platform_mode)
 
 	pm_prepare_console();
 	suspend_console();
+	ftrace_stop();
 	pm_restrict_gfp_mask();
 	error = dpm_suspend_start(PMSG_QUIESCE);
 	if (!error) {
 		error = resume_target_kernel(platform_mode);
 		dpm_resume_end(PMSG_RECOVER);
 	}
 	pm_restore_gfp_mask();
+	ftrace_start();
 	resume_console();
 	pm_restore_console();
 	return error;
@@ -514,6 +522,7 @@ int hibernation_platform_enter(void)
 
 	entering_platform_hibernation = true;
 	suspend_console();
+	ftrace_stop();
 	error = dpm_suspend_start(PMSG_HIBERNATE);
 	if (error) {
 		if (hibernation_ops->recover)
@@ -557,6 +566,7 @@ int hibernation_platform_enter(void)
  Resume_devices:
 	entering_platform_hibernation = false;
 	dpm_resume_end(PMSG_RESTORE);
+	ftrace_start();
 	resume_console();
 
  Close:
@@ -574,6 +584,10 @@ int hibernation_platform_enter(void)
  */
 static void power_down(void)
 {
+#ifdef CONFIG_SUSPEND
+	int error;
+#endif
+
 	switch (hibernation_mode) {
 	case HIBERNATION_REBOOT:
 		kernel_restart(NULL);
@@ -583,6 +597,25 @@ static void power_down(void)
 	case HIBERNATION_SHUTDOWN:
 		kernel_power_off();
 		break;
+#ifdef CONFIG_SUSPEND
+	case HIBERNATION_SUSPEND:
+		error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+		if (error) {
+			if (hibernation_ops)
+				hibernation_mode = HIBERNATION_PLATFORM;
+			else
+				hibernation_mode = HIBERNATION_SHUTDOWN;
+			power_down();
+		}
+		/*
+		 * Restore swap signature.
+		 */
+		error = swsusp_unmark();
+		if (error)
+			printk(KERN_ERR "PM: Swap will be unusable! "
+			                "Try swapon -a.\n");
+		return;
+#endif
 	}
 	kernel_halt();
 	/*
@@ -827,6 +860,9 @@ static const char * const hibernation_modes[] = {
 	[HIBERNATION_PLATFORM]	= "platform",
 	[HIBERNATION_SHUTDOWN]	= "shutdown",
 	[HIBERNATION_REBOOT]	= "reboot",
+#ifdef CONFIG_SUSPEND
+	[HIBERNATION_SUSPEND]	= "suspend",
+#endif
 };
 
 /*
@@ -867,6 +903,9 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
 		switch (i) {
 		case HIBERNATION_SHUTDOWN:
 		case HIBERNATION_REBOOT:
+#ifdef CONFIG_SUSPEND
+		case HIBERNATION_SUSPEND:
+#endif
 			break;
 		case HIBERNATION_PLATFORM:
 			if (hibernation_ops)
@@ -907,6 +946,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
 		switch (mode) {
 		case HIBERNATION_SHUTDOWN:
 		case HIBERNATION_REBOOT:
+#ifdef CONFIG_SUSPEND
+		case HIBERNATION_SUSPEND:
+#endif
 			hibernation_mode = mode;
 			break;
 		case HIBERNATION_PLATFORM:

kernel/power/main.c

@@ -235,6 +235,47 @@ 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;
 
 /**
@@ -531,6 +572,9 @@ static struct attribute * g[] = {
 #ifdef CONFIG_PM_DEBUG
 	&pm_test_attr.attr,
 #endif
+#ifdef CONFIG_PM_SLEEP_DEBUG
+	&pm_print_times_attr.attr,
+#endif
 #endif
 	NULL,
 };
@@ -566,6 +610,7 @@ static int __init pm_init(void)
 	error = sysfs_create_group(power_kobj, &attr_group);
 	if (error)
 		return error;
+	pm_print_times_init();
 	return pm_autosleep_init();
 }
 

kernel/power/power.h

@@ -156,6 +156,9 @@ extern void swsusp_free(void);
 extern int swsusp_read(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
 extern void swsusp_close(fmode_t);
+#ifdef CONFIG_SUSPEND
+extern int swsusp_unmark(void);
+#endif
 
 /* kernel/power/block_io.c */
 extern struct block_device *hib_resume_bdev;

kernel/power/suspend.c

@@ -24,6 +24,7 @@
 #include <linux/export.h>
 #include <linux/suspend.h>
 #include <linux/syscore_ops.h>
+#include <linux/ftrace.h>
 #include <trace/events/power.h>
 
 #include "power.h"
@@ -212,6 +213,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 			goto Close;
 	}
 	suspend_console();
+	ftrace_stop();
 	suspend_test_start();
 	error = dpm_suspend_start(PMSG_SUSPEND);
 	if (error) {
@@ -231,6 +233,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 	suspend_test_start();
 	dpm_resume_end(PMSG_RESUME);
 	suspend_test_finish("resume devices");
+	ftrace_start();
 	resume_console();
  Close:
 	if (suspend_ops->end)