Merge branch 'suspend' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'suspend' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (38 commits)
  suspend: cleanup reference to swsusp_pg_dir[]
  PM: Remove obsolete /sys/devices/.../power/state docs
  Hibernation: Invoke suspend notifications after console switch
  Suspend: Invoke suspend notifications after console switch
  Suspend: Clean up suspend_64.c
  Suspend: Add config option to disable the freezer if architecture wants that
  ACPI: Print message before calling _PTS
  ACPI hibernation: Call _PTS before suspending devices
  Hibernation: Introduce begin() and end() callbacks
  ACPI suspend: Call _PTS before suspending devices
  ACPI: Separate disabling of GPEs from _PTS
  ACPI: Separate invocations of _GTS and _BFS from _PTS and _WAK
  Suspend: Introduce begin() and end() callbacks
  suspend: fix ia64 allmodconfig build
  ACPI: clear GPE earily in resume to avoid warning
  Suspend: Clean up Kconfig (V2)
  Hibernation: Clean up Kconfig (V2)
  Hibernation: Update messages
  Suspend: Use common prefix in messages
  Hibernation: Remove unnecessary variable declaration
  ...

Documentation/kernel-parameters.txt

@@ -168,6 +168,11 @@ and is between 256 and 4096 characters. It is defined in the file
 	acpi_irq_isa=	[HW,ACPI] If irq_balance, mark listed IRQs used by ISA
 			Format: <irq>,<irq>...
 
+	acpi_new_pts_ordering [HW,ACPI]
+			Enforce the ACPI 2.0 ordering of the _PTS control
+			method wrt putting devices into low power states
+			default: pre ACPI 2.0 ordering of _PTS
+
 	acpi_no_auto_ssdt	[HW,ACPI] Disable automatic loading of SSDT
 
 	acpi_os_name=	[HW,ACPI] Tell ACPI BIOS the name of the OS

Documentation/power/devices.txt

@@ -502,52 +502,3 @@ If the CPU can have a "cpufreq" driver, there also may be opportunities
 to shift to lower voltage settings and reduce the power cost of executing
 a given number of instructions.  (Without voltage adjustment, it's rare
 for cpufreq to save much power; the cost-per-instruction must go down.)
-
-
-/sys/devices/.../power/state files
-==================================
-For now you can also test some of this functionality using sysfs.
-
-	DEPRECATED:  USE "power/state" ONLY FOR DRIVER TESTING, AND
-	AVOID USING dev->power.power_state IN DRIVERS.
-
-	THESE WILL BE REMOVED.  IF THE "power/state" FILE GETS REPLACED,
-	IT WILL BECOME SOMETHING COUPLED TO THE BUS OR DRIVER.
-
-In each device's directory, there is a 'power' directory, which contains
-at least a 'state' file.  The value of this field is effectively boolean,
-PM_EVENT_ON or PM_EVENT_SUSPEND.
-
-   *	Reading from this file displays a value corresponding to
-	the power.power_state.event field.  All nonzero values are
-	displayed as "2", corresponding to a low power state; zero
-	is displayed as "0", corresponding to normal operation.
-
-   *	Writing to this file initiates a transition using the
-   	specified event code number; only '0', '2', and '3' are
-	accepted (without a newline); '2' and '3' are both
-	mapped to PM_EVENT_SUSPEND.
-
-On writes, the PM core relies on that recorded event code and the device/bus
-capabilities to determine whether it uses a partial suspend() or resume()
-sequence to change things so that the recorded event corresponds to the
-numeric parameter.
-
-   -	If the bus requires the irqs-disabled suspend_late()/resume_early()
-	phases, writes fail because those operations are not supported here.
-
-   -	If the recorded value is the expected value, nothing is done.
-
-   -	If the recorded value is nonzero, the device is partially resumed,
-	using the bus.resume() and/or class.resume() methods.
-
-   -	If the target value is nonzero, the device is partially suspended,
-	using the class.suspend() and/or bus.suspend() methods and the
-	PM_EVENT_SUSPEND message.
-
-Drivers have no way to tell whether their suspend() and resume() calls
-have come through the sysfs power/state file or as part of entering a
-system sleep state, except that when accessed through sysfs the normal
-parent/child sequencing rules are ignored.  Drivers (such as bus, bridge,
-or hub drivers) which expose child devices may need to enforce those rules
-on their own.

Documentation/power/drivers-testing.txt

@@ -6,9 +6,9 @@ Testing suspend and resume support in device drivers
 Unfortunately, to effectively test the support for the system-wide suspend and
 resume transitions in a driver, it is necessary to suspend and resume a fully
 functional system with this driver loaded.  Moreover, that should be done
-several times, preferably several times in a row, and separately for the suspend
-to disk (STD) and the suspend to RAM (STR) transitions, because each of these
-cases involves different ordering of operations and different interactions with
+several times, preferably several times in a row, and separately for hibernation
+(aka suspend to disk or STD) and suspend to RAM (STR), because each of these
+cases involves slightly different operations and different interactions with
 the machine's BIOS.
 
 Of course, for this purpose the test system has to be known to suspend and
@@ -22,20 +22,24 @@ for more information about the debugging of suspend/resume functionality.
 Once you have resolved the suspend/resume-related problems with your test system
 without the new driver, you are ready to test it:
 
-a) Build the driver as a module, load it and try the STD in the test mode (see:
-Documents/power/basic-pm-debugging.txt, 1a)).
+a) Build the driver as a module, load it and try the test modes of hibernation
+   (see: Documents/power/basic-pm-debugging.txt, 1).
 
-b) Load the driver and attempt to suspend to disk in the "reboot", "shutdown"
-and "platform" modes (see: Documents/power/basic-pm-debugging.txt, 1).
+b) Load the driver and attempt to hibernate in the "reboot", "shutdown" and
+   "platform" modes (see: Documents/power/basic-pm-debugging.txt, 1).
 
-c) Compile the driver directly into the kernel and try the STD in the test mode.
+c) Compile the driver directly into the kernel and try the test modes of
+   hibernation.
 
-d) Attempt to suspend to disk with the driver compiled directly into the kernel
-in the "reboot", "shutdown" and "platform" modes.
+d) Attempt to hibernate with the driver compiled directly into the kernel
+   in the "reboot", "shutdown" and "platform" modes.
 
-e) Attempt to suspend to RAM using the s2ram tool with the driver loaded (see:
-Documents/power/basic-pm-debugging.txt, 2).  As far as the STR tests are
-concerned, it should not matter whether or not the driver is built as a module.
+e) Try the test modes of suspend (see: Documents/power/basic-pm-debugging.txt,
+   2).  [As far as the STR tests are concerned, it should not matter whether or
+   not the driver is built as a module.]
+
+f) Attempt to suspend to RAM using the s2ram tool with the driver loaded
+   (see: Documents/power/basic-pm-debugging.txt, 2).
 
 Each of the above tests should be repeated several times and the STD tests
 should be mixed with the STR tests.  If any of them fails, the driver cannot be

Documentation/power/notifiers.txt

@@ -28,6 +28,14 @@ PM_POST_HIBERNATION	The system memory state has been restored from a
 			hibernation.  Device drivers' .resume() callbacks have
 			been executed and tasks have been thawed.
 
+PM_RESTORE_PREPARE	The system is going to restore a hibernation image.
+			If all goes well the restored kernel will issue a
+			PM_POST_HIBERNATION notification.
+
+PM_POST_RESTORE		An error occurred during the hibernation restore.
+			Device drivers' .resume() callbacks have been executed
+			and tasks have been thawed.
+
 PM_SUSPEND_PREPARE	The system is preparing for a suspend.
 
 PM_POST_SUSPEND		The system has just resumed or an error occured during

Documentation/power/userland-swsusp.txt

@@ -14,7 +14,7 @@ are going to develop your own suspend/resume utilities.
 
 The interface consists of a character device providing the open(),
 release(), read(), and write() operations as well as several ioctl()
-commands defined in kernel/power/power.h.  The major and minor
+commands defined in include/linux/suspend_ioctls.h .  The major and minor
 numbers of the device are, respectively, 10 and 231, and they can
 be read from /sys/class/misc/snapshot/dev.
 
@@ -27,17 +27,17 @@ once at a time.
 The ioctl() commands recognized by the device are:
 
 SNAPSHOT_FREEZE - freeze user space processes (the current process is
-	not frozen); this is required for SNAPSHOT_ATOMIC_SNAPSHOT
+	not frozen); this is required for SNAPSHOT_CREATE_IMAGE
 	and SNAPSHOT_ATOMIC_RESTORE to succeed
 
 SNAPSHOT_UNFREEZE - thaw user space processes frozen by SNAPSHOT_FREEZE
 
-SNAPSHOT_ATOMIC_SNAPSHOT - create a snapshot of the system memory; the
+SNAPSHOT_CREATE_IMAGE - create a snapshot of the system memory; the
 	last argument of ioctl() should be a pointer to an int variable,
 	the value of which will indicate whether the call returned after
 	creating the snapshot (1) or after restoring the system memory state
 	from it (0) (after resume the system finds itself finishing the
-	SNAPSHOT_ATOMIC_SNAPSHOT ioctl() again); after the snapshot
+	SNAPSHOT_CREATE_IMAGE ioctl() again); after the snapshot
 	has been created the read() operation can be used to transfer
 	it out of the kernel
 
@@ -49,39 +49,37 @@ SNAPSHOT_ATOMIC_RESTORE - restore the system memory state from the
 
 SNAPSHOT_FREE - free memory allocated for the snapshot image
 
-SNAPSHOT_SET_IMAGE_SIZE - set the preferred maximum size of the image
+SNAPSHOT_PREF_IMAGE_SIZE - set the preferred maximum size of the image
 	(the kernel will do its best to ensure the image size will not exceed
 	this number, but if it turns out to be impossible, the kernel will
 	create the smallest image possible)
 
-SNAPSHOT_AVAIL_SWAP - return the amount of available swap in bytes (the last
-	argument should be a pointer to an unsigned int variable that will
+SNAPSHOT_GET_IMAGE_SIZE - return the actual size of the hibernation image
+
+SNAPSHOT_AVAIL_SWAP_SIZE - return the amount of available swap in bytes (the
+	last argument should be a pointer to an unsigned int variable that will
 	contain the result if the call is successful).
 
-SNAPSHOT_GET_SWAP_PAGE - allocate a swap page from the resume partition
+SNAPSHOT_ALLOC_SWAP_PAGE - allocate a swap page from the resume partition
 	(the last argument should be a pointer to a loff_t variable that
 	will contain the swap page offset if the call is successful)
 
-SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated with
-	SNAPSHOT_GET_SWAP_PAGE
-
-SNAPSHOT_SET_SWAP_FILE - set the resume partition (the last ioctl() argument
-	should specify the device's major and minor numbers in the old
-	two-byte format, as returned by the stat() function in the .st_rdev
-	member of the stat structure)
+SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated by
+	SNAPSHOT_ALLOC_SWAP_PAGE
 
 SNAPSHOT_SET_SWAP_AREA - set the resume partition and the offset (in <PAGE_SIZE>
 	units) from the beginning of the partition at which the swap header is
 	located (the last ioctl() argument should point to a struct
-	resume_swap_area, as defined in kernel/power/power.h, containing the
-	resume device specification, as for the SNAPSHOT_SET_SWAP_FILE ioctl(),
-	and the offset); for swap partitions the offset is always 0, but it is
-	different to zero for swap files (please see
-	Documentation/swsusp-and-swap-files.txt for details).
-	The SNAPSHOT_SET_SWAP_AREA ioctl() is considered as a replacement for
-	SNAPSHOT_SET_SWAP_FILE which is regarded as obsolete.   It is
-	recommended to always use this call, because the code to set the resume
-	partition may be removed from future kernels
+	resume_swap_area, as defined in kernel/power/suspend_ioctls.h,
+	containing the resume device specification and the offset); for swap
+	partitions the offset is always 0, but it is different from zero for
+	swap files (see Documentation/swsusp-and-swap-files.txt for details).
+
+SNAPSHOT_PLATFORM_SUPPORT - enable/disable the hibernation platform support,
+	depending on the argument value (enable, if the argument is nonzero)
+
+SNAPSHOT_POWER_OFF - make the kernel transition the system to the hibernation
+	state (eg. ACPI S4) using the platform (eg. ACPI) driver
 
 SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to
 	immediately enter the suspend-to-RAM state, so this call must always
@@ -93,24 +91,6 @@ SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to
 	to resume the system from RAM if there's enough battery power or restore
 	its state on the basis of the saved suspend image otherwise)
 
-SNAPSHOT_PMOPS - enable the usage of the hibernation_ops->prepare,
-	hibernate_ops->enter and hibernation_ops->finish methods (the in-kernel
-	swsusp knows these as the "platform method") which are needed on many
-	machines to (among others) speed up the resume by letting the BIOS skip
-	some steps or to let the system recognise the correct state of the
-	hardware after the resume (in particular on many machines this ensures
-	that unplugged AC adapters get correctly detected and that kacpid does
-	not run wild after the resume).  The last ioctl() argument can take one
-	of the three values, defined in kernel/power/power.h:
-	PMOPS_PREPARE - make the kernel carry out the
-		hibernation_ops->prepare() operation
-	PMOPS_ENTER - make the kernel power off the system by calling
-		hibernation_ops->enter()
-	PMOPS_FINISH - make the kernel carry out the
-		hibernation_ops->finish() operation
-	Note that the actual constants are misnamed because they surface
-	internal kernel implementation details that have changed.
-
 The device's read() operation can be used to transfer the snapshot image from
 the kernel.  It has the following limitations:
 - you cannot read() more than one virtual memory page at a time
@@ -122,7 +102,7 @@ The device's write() operation is used for uploading the system memory snapshot
 into the kernel.  It has the same limitations as the read() operation.
 
 The release() operation frees all memory allocated for the snapshot image
-and all swap pages allocated with SNAPSHOT_GET_SWAP_PAGE (if any).
+and all swap pages allocated with SNAPSHOT_ALLOC_SWAP_PAGE (if any).
 Thus it is not necessary to use either SNAPSHOT_FREE or
 SNAPSHOT_FREE_SWAP_PAGES before closing the device (in fact it will also
 unfreeze user space processes frozen by SNAPSHOT_UNFREEZE if they are
@@ -133,16 +113,12 @@ snapshot image from/to the kernel will use a swap parition, called the resume
 partition, or a swap file as storage space (if a swap file is used, the resume
 partition is the partition that holds this file).  However, this is not really
 required, as they can use, for example, a special (blank) suspend partition or
-a file on a partition that is unmounted before SNAPSHOT_ATOMIC_SNAPSHOT and
+a file on a partition that is unmounted before SNAPSHOT_CREATE_IMAGE and
 mounted afterwards.
 
-These utilities SHOULD NOT make any assumptions regarding the ordering of
-data within the snapshot image, except for the image header that MAY be
-assumed to start with an swsusp_info structure, as specified in
-kernel/power/power.h.  This structure MAY be used by the userland utilities
-to obtain some information about the snapshot image, such as the size
-of the snapshot image, including the metadata and the header itself,
-contained in the .size member of swsusp_info.
+These utilities MUST NOT make any assumptions regarding the ordering of
+data within the snapshot image.  The contents of the image are entirely owned
+by the kernel and its structure may be changed in future kernel releases.
 
 The snapshot image MUST be written to the kernel unaltered (ie. all of the image
 data, metadata and header MUST be written in _exactly_ the same amount, form
@@ -159,7 +135,7 @@ means, such as checksums, to ensure the integrity of the snapshot image.
 The suspending and resuming utilities MUST lock themselves in memory,
 preferrably using mlockall(), before calling SNAPSHOT_FREEZE.
 
-The suspending utility MUST check the value stored by SNAPSHOT_ATOMIC_SNAPSHOT
+The suspending utility MUST check the value stored by SNAPSHOT_CREATE_IMAGE
 in the memory location pointed to by the last argument of ioctl() and proceed
 in accordance with it:
 1. 	If the value is 1 (ie. the system memory snapshot has just been
@@ -173,7 +149,7 @@ in accordance with it:
 		image has been saved.
 	(b)	The suspending utility SHOULD NOT attempt to perform any
 		file system operations (including reads) on the file systems
-		that were mounted before SNAPSHOT_ATOMIC_SNAPSHOT has been
+		that were mounted before SNAPSHOT_CREATE_IMAGE has been
 		called.  However, it MAY mount a file system that was not
 		mounted at that time and perform some operations on it (eg.
 		use it for saving the image).

arch/arm/Kconfig

@@ -1030,6 +1030,9 @@ menu "Power management options"
 
 source "kernel/power/Kconfig"
 
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+
 endmenu
 
 source "net/Kconfig"

arch/arm/mach-at91/pm.c

@@ -52,7 +52,7 @@ static suspend_state_t target_state;
 /*
  * Called after processes are frozen, but before we shutdown devices.
  */
-static int at91_pm_set_target(suspend_state_t state)
+static int at91_pm_begin(suspend_state_t state)
 {
 	target_state = state;
 	return 0;
@@ -202,11 +202,20 @@ static int at91_pm_enter(suspend_state_t state)
 	return 0;
 }
 
+/*
+ * Called right prior to thawing processes.
+ */
+static void at91_pm_end(void)
+{
+	target_state = PM_SUSPEND_ON;
+}
+
 
 static struct platform_suspend_ops at91_pm_ops ={
-	.valid		= at91_pm_valid_state,
-	.set_target	= at91_pm_set_target,
-	.enter		= at91_pm_enter,
+	.valid	= at91_pm_valid_state,
+	.begin	= at91_pm_begin,
+	.enter	= at91_pm_enter,
+	.end	= at91_pm_end,
 };
 
 static int __init at91_pm_init(void)

arch/blackfin/Kconfig

@@ -898,6 +898,10 @@ endmenu
 menu "Power management options"
 source "kernel/power/Kconfig"
 
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on !SMP
+
 choice
 	prompt "Select PM Wakeup Event Source"
 	default PM_WAKEUP_GPIO_BY_SIC_IWR

arch/frv/Kconfig

@@ -352,6 +352,11 @@ source "drivers/pcmcia/Kconfig"
 #	  should probably wait a while.
 
 menu "Power management options"
+
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on !SMP
+
 source kernel/power/Kconfig
 endmenu
 

arch/mips/Kconfig

@@ -2081,6 +2081,10 @@ endmenu
 
 menu "Power management options"
 
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on !SMP
+
 source "kernel/power/Kconfig"
 
 endmenu

arch/powerpc/Kconfig

@@ -151,11 +151,25 @@ config DEFAULT_UIMAGE
 config REDBOOT
 	bool
 
-config PPC64_SWSUSP
+config HIBERNATE_32
 	bool
-	depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
+	depends on (PPC_PMAC && !SMP) || BROKEN
 	default y
 
+config HIBERNATE_64
+	bool
+	depends on BROKEN || (PPC_PMAC64 && EXPERIMENTAL)
+	default y
+
+config ARCH_HIBERNATION_POSSIBLE
+	bool
+	depends on (PPC64 && HIBERNATE_64) || (PPC32 && HIBERNATE_32)
+	default y
+
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200
+
 config PPC_DCR_NATIVE
 	bool
 	default n
@@ -391,6 +405,10 @@ config CMDLINE
 	  most cases you will need to specify the root device here.
 
 if !44x || BROKEN
+config ARCH_WANTS_FREEZER_CONTROL
+	def_bool y
+	depends on ADB_PMU
+
 source kernel/power/Kconfig
 endif
 

arch/powerpc/platforms/52xx/lite5200_pm.c

@@ -31,7 +31,7 @@ static int lite5200_pm_valid(suspend_state_t state)
 	}
 }
 
-static int lite5200_pm_set_target(suspend_state_t state)
+static int lite5200_pm_begin(suspend_state_t state)
 {
 	if (lite5200_pm_valid(state)) {
 		lite5200_pm_target_state = state;
@@ -219,12 +219,18 @@ static void lite5200_pm_finish(void)
 		mpc52xx_pm_finish();
 }
 
+static void lite5200_pm_end(void)
+{
+	lite5200_pm_target_state = PM_SUSPEND_ON;
+}
+
 static struct platform_suspend_ops lite5200_pm_ops = {
 	.valid		= lite5200_pm_valid,
-	.set_target	= lite5200_pm_set_target,
+	.begin		= lite5200_pm_begin,
 	.prepare	= lite5200_pm_prepare,
 	.enter		= lite5200_pm_enter,
 	.finish		= lite5200_pm_finish,
+	.end		= lite5200_pm_end,
 };
 
 int __init lite5200_pm_init(void)

arch/sh/Kconfig

@@ -882,6 +882,10 @@ endmenu
 menu "Power management options (EXPERIMENTAL)"
 depends on EXPERIMENTAL && SYS_SUPPORTS_PM
 
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on !SMP
+
 source kernel/power/Kconfig
 
 endmenu

arch/x86/Kconfig

@@ -112,6 +112,14 @@ config ARCH_SUPPORTS_OPROFILE
 
 select HAVE_KVM
 
+config ARCH_HIBERNATION_POSSIBLE
+	def_bool y
+	depends on !SMP || !X86_VOYAGER
+
+config ARCH_SUSPEND_POSSIBLE
+	def_bool y
+	depends on !X86_VOYAGER
+
 config ZONE_DMA32
 	bool
 	default X86_64

arch/x86/kernel/suspend_64.c

@@ -140,7 +140,12 @@ static void fix_processor_context(void)
 	int cpu = smp_processor_id();
 	struct tss_struct *t = &per_cpu(init_tss, cpu);
 
-	set_tss_desc(cpu,t);	/* This just modifies memory; should not be necessary. But... This is necessary, because 386 hardware has concept of busy TSS or some similar stupidity. */
+	/*
+	 * This just modifies memory; should not be necessary. But... This
+	 * is necessary, because 386 hardware has concept of busy TSS or some
+	 * similar stupidity.
+	 */
+	set_tss_desc(cpu, t);
 
 	get_cpu_gdt_table(cpu)[GDT_ENTRY_TSS].type = 9;
 
@@ -160,7 +165,6 @@ static void fix_processor_context(void)
                 loaddebug(&current->thread, 6);
                 loaddebug(&current->thread, 7);
 	}
-
 }
 
 #ifdef CONFIG_HIBERNATION

arch/x86/mm/init_32.c

@@ -423,23 +423,23 @@ static void __init pagetable_init(void)
 	paravirt_pagetable_setup_done(pgd_base);
 }
 
-#if defined(CONFIG_HIBERNATION) || defined(CONFIG_ACPI)
+#ifdef CONFIG_ACPI_SLEEP
 /*
- * Swap suspend & friends need this for resume because things like the intel-agp
+ * ACPI suspend needs this for resume, because things like the intel-agp
  * driver might have split up a kernel 4MB mapping.
  */
-char __nosavedata swsusp_pg_dir[PAGE_SIZE]
+char swsusp_pg_dir[PAGE_SIZE]
 	__attribute__ ((aligned(PAGE_SIZE)));
 
 static inline void save_pg_dir(void)
 {
 	memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE);
 }
-#else
+#else /* !CONFIG_ACPI_SLEEP */
 static inline void save_pg_dir(void)
 {
 }
-#endif
+#endif /* !CONFIG_ACPI_SLEEP */
 
 void zap_low_mappings(void)
 {

drivers/acpi/hardware/hwsleep.c

@@ -192,18 +192,13 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 	arg.type = ACPI_TYPE_INTEGER;
 	arg.integer.value = sleep_state;
 
-	/* Run the _PTS and _GTS methods */
+	/* Run the _PTS method */
 
 	status = acpi_evaluate_object(NULL, METHOD_NAME__PTS, &arg_list, NULL);
 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 		return_ACPI_STATUS(status);
 	}
 
-	status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-		return_ACPI_STATUS(status);
-	}
-
 	/* Setup the argument to _SST */
 
 	switch (sleep_state) {
@@ -234,10 +229,6 @@ acpi_status acpi_enter_sleep_state_prep(u8 sleep_state)
 				"While executing method _SST"));
 	}
 
-	/* Disable/Clear all GPEs */
-
-	status = acpi_hw_disable_all_gpes();
-
 	return_ACPI_STATUS(status);
 }
 
@@ -262,6 +253,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 	struct acpi_bit_register_info *sleep_type_reg_info;
 	struct acpi_bit_register_info *sleep_enable_reg_info;
 	u32 in_value;
+	struct acpi_object_list arg_list;
+	union acpi_object arg;
 	acpi_status status;
 
 	ACPI_FUNCTION_TRACE(acpi_enter_sleep_state);
@@ -307,6 +300,18 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
 		return_ACPI_STATUS(status);
 	}
 
+	/* Execute the _GTS method */
+
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = sleep_state;
+
+	status = acpi_evaluate_object(NULL, METHOD_NAME__GTS, &arg_list, NULL);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		return_ACPI_STATUS(status);
+	}
+
 	/* Get current value of PM1A control */
 
 	status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL, &PM1Acontrol);
@@ -473,17 +478,18 @@ ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_leave_sleep_state
+ * FUNCTION:    acpi_leave_sleep_state_prep
  *
- * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ * PARAMETERS:  sleep_state         - Which sleep state we are exiting
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
- *              Called with interrupts ENABLED.
+ * DESCRIPTION: Perform the first state of OS-independent ACPI cleanup after a
+ *              sleep.
+ *              Called with interrupts DISABLED.
  *
  ******************************************************************************/
-acpi_status acpi_leave_sleep_state(u8 sleep_state)
+acpi_status acpi_leave_sleep_state_prep(u8 sleep_state)
 {
 	struct acpi_object_list arg_list;
 	union acpi_object arg;
@@ -493,7 +499,7 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 	u32 PM1Acontrol;
 	u32 PM1Bcontrol;
 
-	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
+	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep);
 
 	/*
 	 * Set SLP_TYPE and SLP_EN to state S0.
@@ -540,6 +546,41 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 		}
 	}
 
+	/* Execute the _BFS method */
+
+	arg_list.count = 1;
+	arg_list.pointer = &arg;
+	arg.type = ACPI_TYPE_INTEGER;
+	arg.integer.value = sleep_state;
+
+	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_leave_sleep_state
+ *
+ * PARAMETERS:  sleep_state         - Which sleep state we just exited
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Perform OS-independent ACPI cleanup after a sleep
+ *              Called with interrupts ENABLED.
+ *
+ ******************************************************************************/
+acpi_status acpi_leave_sleep_state(u8 sleep_state)
+{
+	struct acpi_object_list arg_list;
+	union acpi_object arg;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(acpi_leave_sleep_state);
+
 	/* Ensure enter_sleep_state_prep -> enter_sleep_state ordering */
 
 	acpi_gbl_sleep_type_a = ACPI_SLEEP_TYPE_INVALID;
@@ -558,12 +599,6 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 		ACPI_EXCEPTION((AE_INFO, status, "During Method _SST"));
 	}
 
-	arg.integer.value = sleep_state;
-	status = acpi_evaluate_object(NULL, METHOD_NAME__BFS, &arg_list, NULL);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
-		ACPI_EXCEPTION((AE_INFO, status, "During Method _BFS"));
-	}
-
 	/*
 	 * GPEs must be enabled before _WAK is called as GPEs
 	 * might get fired there

drivers/acpi/sleep/main.c

@@ -26,9 +26,24 @@ u8 sleep_states[ACPI_S_STATE_COUNT];
 
 #ifdef CONFIG_PM_SLEEP
 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+static bool acpi_sleep_finish_wake_up;
+
+/*
+ * ACPI 2.0 and later want us to execute _PTS after suspending devices, so we
+ * allow the user to request that behavior by using the 'acpi_new_pts_ordering'
+ * kernel command line option that causes the following variable to be set.
+ */
+static bool new_pts_ordering;
+
+static int __init acpi_new_pts_ordering(char *str)
+{
+	new_pts_ordering = true;
+	return 1;
+}
+__setup("acpi_new_pts_ordering", acpi_new_pts_ordering);
 #endif
 
-int acpi_sleep_prepare(u32 acpi_state)
+static int acpi_sleep_prepare(u32 acpi_state)
 {
 #ifdef CONFIG_ACPI_SLEEP
 	/* do we have a wakeup address for S2 and S3? */
@@ -44,6 +59,8 @@ int acpi_sleep_prepare(u32 acpi_state)
 	ACPI_FLUSH_CPU_CACHE();
 	acpi_enable_wakeup_device_prep(acpi_state);
 #endif
+	printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
+		acpi_state);
 	acpi_enter_sleep_state_prep(acpi_state);
 	return 0;
 }
@@ -63,17 +80,25 @@ static u32 acpi_suspend_states[] = {
 static int init_8259A_after_S1;
 
 /**
- *	acpi_pm_set_target - Set the target system sleep state to the state
+ *	acpi_pm_begin - Set the target system sleep state to the state
  *		associated with given @pm_state, if supported.
  */
 
-static int acpi_pm_set_target(suspend_state_t pm_state)
+static int acpi_pm_begin(suspend_state_t pm_state)
 {
 	u32 acpi_state = acpi_suspend_states[pm_state];
 	int error = 0;
 
 	if (sleep_states[acpi_state]) {
 		acpi_target_sleep_state = acpi_state;
+		if (new_pts_ordering)
+			return 0;
+
+		error = acpi_sleep_prepare(acpi_state);
+		if (error)
+			acpi_target_sleep_state = ACPI_STATE_S0;
+		else
+			acpi_sleep_finish_wake_up = true;
 	} else {
 		printk(KERN_ERR "ACPI does not support this state: %d\n",
 			pm_state);
@@ -91,12 +116,17 @@ static int acpi_pm_set_target(suspend_state_t pm_state)
 
 static int acpi_pm_prepare(void)
 {
-	int error = acpi_sleep_prepare(acpi_target_sleep_state);
+	if (new_pts_ordering) {
+		int error = acpi_sleep_prepare(acpi_target_sleep_state);
 
-	if (error)
-		acpi_target_sleep_state = ACPI_STATE_S0;
+		if (error) {
+			acpi_target_sleep_state = ACPI_STATE_S0;
+			return error;
+		}
+		acpi_sleep_finish_wake_up = true;
+	}
 
-	return error;
+	return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
 }
 
 /**
@@ -120,10 +150,8 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 	if (acpi_state == ACPI_STATE_S3) {
 		int error = acpi_save_state_mem();
 
-		if (error) {
-			acpi_target_sleep_state = ACPI_STATE_S0;
+		if (error)
 			return error;
-		}
 	}
 
 	local_irq_save(flags);
@@ -139,6 +167,9 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 		break;
 	}
 
+	/* Reprogram control registers and execute _BFS */
+	acpi_leave_sleep_state_prep(acpi_state);
+
 	/* ACPI 3.0 specs (P62) says that it's the responsabilty
 	 * of the OSPM to clear the status bit [ implying that the
 	 * POWER_BUTTON event should not reach userspace ]
@@ -146,6 +177,13 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 		acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 
+	/*
+	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
+	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
+	 * acpi_leave_sleep_state will reenable specific GPEs later
+	 */
+	acpi_hw_disable_all_gpes();
+
 	local_irq_restore(flags);
 	printk(KERN_DEBUG "Back to C!\n");
 
@@ -157,7 +195,7 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 }
 
 /**
- *	acpi_pm_finish - Finish up suspend sequence.
+ *	acpi_pm_finish - Instruct the platform to leave a sleep state.
  *
  *	This is called after we wake back up (or if entering the sleep state
  *	failed). 
@@ -174,6 +212,7 @@ static void acpi_pm_finish(void)
 	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 
 	acpi_target_sleep_state = ACPI_STATE_S0;
+	acpi_sleep_finish_wake_up = false;
 
 #ifdef CONFIG_X86
 	if (init_8259A_after_S1) {
@@ -183,6 +222,20 @@ static void acpi_pm_finish(void)
 #endif
 }
 
+/**
+ *	acpi_pm_end - Finish up suspend sequence.
+ */
+
+static void acpi_pm_end(void)
+{
+	/*
+	 * This is necessary in case acpi_pm_finish() is not called directly
+	 * during a failing transition to a sleep state.
+	 */
+	if (acpi_sleep_finish_wake_up)
+		acpi_pm_finish();
+}
+
 static int acpi_pm_state_valid(suspend_state_t pm_state)
 {
 	u32 acpi_state;
@@ -201,10 +254,11 @@ static int acpi_pm_state_valid(suspend_state_t pm_state)
 
 static struct platform_suspend_ops acpi_pm_ops = {
 	.valid = acpi_pm_state_valid,
-	.set_target = acpi_pm_set_target,
+	.begin = acpi_pm_begin,
 	.prepare = acpi_pm_prepare,
 	.enter = acpi_pm_enter,
 	.finish = acpi_pm_finish,
+	.end = acpi_pm_end,
 };
 
 /*
@@ -229,15 +283,36 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 #endif /* CONFIG_SUSPEND */
 
 #ifdef CONFIG_HIBERNATION
-static int acpi_hibernation_start(void)
+static int acpi_hibernation_begin(void)
 {
+	int error;
+
 	acpi_target_sleep_state = ACPI_STATE_S4;
-	return 0;
+	if (new_pts_ordering)
+		return 0;
+
+	error = acpi_sleep_prepare(ACPI_STATE_S4);
+	if (error)
+		acpi_target_sleep_state = ACPI_STATE_S0;
+	else
+		acpi_sleep_finish_wake_up = true;
+
+	return error;
 }
 
 static int acpi_hibernation_prepare(void)
 {
-	return acpi_sleep_prepare(ACPI_STATE_S4);
+	if (new_pts_ordering) {
+		int error = acpi_sleep_prepare(ACPI_STATE_S4);
+
+		if (error) {
+			acpi_target_sleep_state = ACPI_STATE_S0;
+			return error;
+		}
+		acpi_sleep_finish_wake_up = true;
+	}
+
+	return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
 }
 
 static int acpi_hibernation_enter(void)
@@ -251,6 +326,8 @@ static int acpi_hibernation_enter(void)
 	acpi_enable_wakeup_device(ACPI_STATE_S4);
 	/* This shouldn't return.  If it returns, we have a problem */
 	status = acpi_enter_sleep_state(ACPI_STATE_S4);
+	/* Reprogram control registers and execute _BFS */
+	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 	local_irq_restore(flags);
 
 	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
@@ -263,15 +340,12 @@ static void acpi_hibernation_leave(void)
 	 * enable it here.
 	 */
 	acpi_enable();
+	/* Reprogram control registers and execute _BFS */
+	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 }
 
 static void acpi_hibernation_finish(void)
 {
-	/*
-	 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
-	 * enable it here.
-	 */
-	acpi_enable();
 	acpi_disable_wakeup_device(ACPI_STATE_S4);
 	acpi_leave_sleep_state(ACPI_STATE_S4);
 
@@ -279,6 +353,17 @@ static void acpi_hibernation_finish(void)
 	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 
 	acpi_target_sleep_state = ACPI_STATE_S0;
+	acpi_sleep_finish_wake_up = false;
+}
+
+static void acpi_hibernation_end(void)
+{
+	/*
+	 * This is necessary in case acpi_hibernation_finish() is not called
+	 * directly during a failing transition to the sleep state.
+	 */
+	if (acpi_sleep_finish_wake_up)
+		acpi_hibernation_finish();
 }
 
 static int acpi_hibernation_pre_restore(void)
@@ -296,7 +381,8 @@ static void acpi_hibernation_restore_cleanup(void)
 }
 
 static struct platform_hibernation_ops acpi_hibernation_ops = {
-	.start = acpi_hibernation_start,
+	.begin = acpi_hibernation_begin,
+	.end = acpi_hibernation_end,
 	.pre_snapshot = acpi_hibernation_prepare,
 	.finish = acpi_hibernation_finish,
 	.prepare = acpi_hibernation_prepare,
@@ -403,6 +489,7 @@ static void acpi_power_off_prepare(void)
 {
 	/* Prepare to power off the system */
 	acpi_sleep_prepare(ACPI_STATE_S5);
+	acpi_hw_disable_all_gpes();
 }
 
 static void acpi_power_off(void)

drivers/acpi/sleep/sleep.h

@@ -5,5 +5,3 @@ extern int acpi_suspend (u32 state);
 extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
 extern void acpi_enable_wakeup_device(u8 sleep_state);
 extern void acpi_disable_wakeup_device(u8 sleep_state);
-
-extern int acpi_sleep_prepare(u32 acpi_state);

drivers/base/power/Makefile

 obj-$(CONFIG_PM)	+= sysfs.o
 obj-$(CONFIG_PM_SLEEP)	+= main.o
-obj-$(CONFIG_PM_TRACE)	+= trace.o
+obj-$(CONFIG_PM_TRACE_RTC)	+= trace.o
 
 ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
 ccflags-$(CONFIG_PM_VERBOSE)   += -DDEBUG

include/acpi/acpixf.h

@@ -335,6 +335,8 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state);
 
 acpi_status asmlinkage acpi_enter_sleep_state_s4bios(void);
 
+acpi_status acpi_leave_sleep_state_prep(u8 sleep_state);
+
 acpi_status acpi_leave_sleep_state(u8 sleep_state);
 
 #endif				/* __ACXFACE_H__ */

include/linux/Kbuild

@@ -143,6 +143,7 @@ header-y += snmp.h
 header-y += sockios.h
 header-y += som.h
 header-y += sound.h
+header-y += suspend_ioctls.h
 header-y += taskstats.h
 header-y += telephony.h
 header-y += termios.h

include/linux/notifier.h

@@ -228,6 +228,8 @@ static inline int notifier_to_errno(int ret)
 #define PM_POST_HIBERNATION	0x0002 /* Hibernation finished */
 #define PM_SUSPEND_PREPARE	0x0003 /* Going to suspend the system */
 #define PM_POST_SUSPEND		0x0004 /* Suspend finished */
+#define PM_RESTORE_PREPARE	0x0005 /* Going to restore a saved image */
+#define PM_POST_RESTORE		0x0006 /* Restore failed */
 
 /* Console keyboard events.
  * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and

include/linux/suspend.h

@@ -38,18 +38,16 @@ typedef int __bitwise suspend_state_t;
  *	There is the %suspend_valid_only_mem function available that can be
  *	assigned to this if the platform only supports mem sleep.
  *
- * @set_target: Tell the platform which system sleep state is going to be
- *	entered.
- *	@set_target() is executed right prior to suspending devices.  The
- *	information conveyed to the platform code by @set_target() should be
- *	disregarded by the platform as soon as @finish() is executed and if
- *	@prepare() fails.  If @set_target() fails (ie. returns nonzero),
+ * @begin: Initialise a transition to given system sleep state.
+ *	@begin() is executed right prior to suspending devices.  The information
+ *	conveyed to the platform code by @begin() should be disregarded by it as
+ *	soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
  *	@prepare(), @enter() and @finish() will not be called by the PM core.
  *	This callback is optional.  However, if it is implemented, the argument
- *	passed to @enter() is meaningless and should be ignored.
+ *	passed to @enter() is redundant and should be ignored.
  *
  * @prepare: Prepare the platform for entering the system sleep state indicated
- *	by @set_target().
+ *	by @begin().
  *	@prepare() is called right after devices have been suspended (ie. the
  *	appropriate .suspend() method has been executed for each device) and
  *	before the nonboot CPUs are disabled (it is executed with IRQs enabled).
@@ -57,8 +55,8 @@ typedef int __bitwise suspend_state_t;
  *	error code otherwise, in which case the system cannot enter the desired
  *	sleep state (@enter() and @finish() will not be called in that case).
  *
- * @enter: Enter the system sleep state indicated by @set_target() or
- *	represented by the argument if @set_target() is not implemented.
+ * @enter: Enter the system sleep state indicated by @begin() or represented by
+ *	the argument if @begin() is not implemented.
  *	This callback is mandatory.  It returns 0 on success or a negative
  *	error code otherwise, in which case the system cannot enter the desired
  *	sleep state.
@@ -69,13 +67,22 @@ typedef int __bitwise suspend_state_t;
  *	This callback is optional, but should be implemented by the platforms
  *	that implement @prepare().  If implemented, it is always called after
  *	@enter() (even if @enter() fails).
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *	the platform that the system has returned to the working state or
+ *	the transition to the sleep state has been aborted.
+ *	This callback is optional, but should be implemented by the platforms
+ *	that implement @begin(), but platforms implementing @begin() should
+ *	also provide a @end() which cleans up transitions aborted before
+ *	@enter().
  */
 struct platform_suspend_ops {
 	int (*valid)(suspend_state_t state);
-	int (*set_target)(suspend_state_t state);
+	int (*begin)(suspend_state_t state);
 	int (*prepare)(void);
 	int (*enter)(suspend_state_t state);
 	void (*finish)(void);
+	void (*end)(void);
 };
 
 #ifdef CONFIG_SUSPEND
@@ -129,14 +136,17 @@ extern void mark_free_pages(struct zone *zone);
 /**
  * struct platform_hibernation_ops - hibernation platform support
  *
- * The methods in this structure allow a platform to override the default
- * mechanism of shutting down the machine during a hibernation transition.
+ * The methods in this structure allow a platform to carry out special
+ * operations required by it during a hibernation transition.
  *
- * All three methods must be assigned.
+ * All the methods below must be implemented.
  *
- * @start: Tell the platform driver that we're starting hibernation.
+ * @begin: Tell the platform driver that we're starting hibernation.
  *	Called right after shrinking memory and before freezing devices.
  *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *	the platform that the system has returned to the working state.
+ *
  * @pre_snapshot: Prepare the platform for creating the hibernation image.
  *	Called right after devices have been frozen and before the nonboot
  *	CPUs are disabled (runs with IRQs on).
@@ -171,7 +181,8 @@ extern void mark_free_pages(struct zone *zone);
  *	thawing devices (runs with IRQs on).
  */
 struct platform_hibernation_ops {
-	int (*start)(void);
+	int (*begin)(void);
+	void (*end)(void);
 	int (*pre_snapshot)(void);
 	void (*finish)(void);
 	int (*prepare)(void);
@@ -213,17 +224,8 @@ void save_processor_state(void);
 void restore_processor_state(void);
 
 /* kernel/power/main.c */
-extern struct blocking_notifier_head pm_chain_head;
-
-static inline int register_pm_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_register(&pm_chain_head, nb);
-}
-
-static inline int unregister_pm_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_unregister(&pm_chain_head, nb);
-}
+extern int register_pm_notifier(struct notifier_block *nb);
+extern int unregister_pm_notifier(struct notifier_block *nb);
 
 #define pm_notifier(fn, pri) {				\
 	static struct notifier_block fn##_nb =			\

include/linux/suspend_ioctls.h

+#ifndef _LINUX_SUSPEND_IOCTLS_H
+#define _LINUX_SUSPEND_IOCTLS_H
+
+/*
+ * This structure is used to pass the values needed for the identification
+ * of the resume swap area from a user space to the kernel via the
+ * SNAPSHOT_SET_SWAP_AREA ioctl
+ */
+struct resume_swap_area {
+	loff_t offset;
+	u_int32_t dev;
+} __attribute__((packed));
+
+#define SNAPSHOT_IOC_MAGIC	'3'
+#define SNAPSHOT_FREEZE			_IO(SNAPSHOT_IOC_MAGIC, 1)
+#define SNAPSHOT_UNFREEZE		_IO(SNAPSHOT_IOC_MAGIC, 2)
+#define SNAPSHOT_ATOMIC_RESTORE		_IO(SNAPSHOT_IOC_MAGIC, 4)
+#define SNAPSHOT_FREE			_IO(SNAPSHOT_IOC_MAGIC, 5)
+#define SNAPSHOT_FREE_SWAP_PAGES	_IO(SNAPSHOT_IOC_MAGIC, 9)
+#define SNAPSHOT_S2RAM			_IO(SNAPSHOT_IOC_MAGIC, 11)
+#define SNAPSHOT_SET_SWAP_AREA		_IOW(SNAPSHOT_IOC_MAGIC, 13, \
+							struct resume_swap_area)
+#define SNAPSHOT_GET_IMAGE_SIZE		_IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t)
+#define SNAPSHOT_PLATFORM_SUPPORT	_IO(SNAPSHOT_IOC_MAGIC, 15)
+#define SNAPSHOT_POWER_OFF		_IO(SNAPSHOT_IOC_MAGIC, 16)
+#define SNAPSHOT_CREATE_IMAGE		_IOW(SNAPSHOT_IOC_MAGIC, 17, int)
+#define SNAPSHOT_PREF_IMAGE_SIZE	_IO(SNAPSHOT_IOC_MAGIC, 18)
+#define SNAPSHOT_AVAIL_SWAP_SIZE	_IOR(SNAPSHOT_IOC_MAGIC, 19, loff_t)
+#define SNAPSHOT_ALLOC_SWAP_PAGE	_IOR(SNAPSHOT_IOC_MAGIC, 20, loff_t)
+#define SNAPSHOT_IOC_MAXNR	20
+
+#endif /* _LINUX_SUSPEND_IOCTLS_H */

kernel/power/Kconfig

@@ -44,9 +44,30 @@ config PM_VERBOSE
 	---help---
 	This option enables verbose messages from the Power Management code.
 
+config CAN_PM_TRACE
+	def_bool y
+	depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL
+
 config PM_TRACE
+	bool
+	help
+	  This enables code to save the last PM event point across
+	  reboot. The architecture needs to support this, x86 for
+	  example does by saving things in the RTC, see below.
+
+	  The architecture specific code must provide the extern
+	  functions from <linux/resume-trace.h> as well as the
+	  <asm/resume-trace.h> header with a TRACE_RESUME() macro.
+
+	  The way the information is presented is architecture-
+	  dependent, x86 will print the information during a
+	  late_initcall.
+
+config PM_TRACE_RTC
 	bool "Suspend/resume event tracing"
-	depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL
+	depends on CAN_PM_TRACE
+	depends on X86
+	select PM_TRACE
 	default n
 	---help---
 	This enables some cheesy code to save the last PM event point in the
@@ -63,7 +84,8 @@ config PM_TRACE
 
 config PM_SLEEP_SMP
 	bool
-	depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
+	depends on SMP
+	depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
 	depends on PM_SLEEP
 	select HOTPLUG_CPU
 	default y
@@ -73,46 +95,29 @@ config PM_SLEEP
 	depends on SUSPEND || HIBERNATION
 	default y
 
-config SUSPEND_UP_POSSIBLE
-	bool
-	depends on (X86 && !X86_VOYAGER) || PPC || ARM || BLACKFIN || MIPS \
-		   || SUPERH || FRV
-	depends on !SMP
-	default y
-
-config SUSPEND_SMP_POSSIBLE
-	bool
-	depends on (X86 && !X86_VOYAGER) \
-		   || (PPC && (PPC_PSERIES || PPC_PMAC)) || ARM
-	depends on SMP
-	default y
-
 config SUSPEND
 	bool "Suspend to RAM and standby"
-	depends on PM
-	depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_POSSIBLE
+	depends on PM && ARCH_SUSPEND_POSSIBLE
 	default y
 	---help---
 	  Allow the system to enter sleep states in which main memory is
 	  powered and thus its contents are preserved, such as the
-	  suspend-to-RAM state (i.e. the ACPI S3 state).
+	  suspend-to-RAM state (e.g. the ACPI S3 state).
 
-config HIBERNATION_UP_POSSIBLE
-	bool
-	depends on X86 || PPC64_SWSUSP || PPC32
-	depends on !SMP
+config SUSPEND_FREEZER
+	bool "Enable freezer for suspend to RAM/standby" \
+		if ARCH_WANTS_FREEZER_CONTROL || BROKEN
+	depends on SUSPEND
 	default y
+	help
+	  This allows you to turn off the freezer for suspend. If this is
+	  done, no tasks are frozen for suspend to RAM/standby.
 
-config HIBERNATION_SMP_POSSIBLE
-	bool
-	depends on (X86 && !X86_VOYAGER) || PPC64_SWSUSP
-	depends on SMP
-	default y
+	  Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
 config HIBERNATION
 	bool "Hibernation (aka 'suspend to disk')"
-	depends on PM && SWAP
-	depends on HIBERNATION_UP_POSSIBLE || HIBERNATION_SMP_POSSIBLE
+	depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
 	---help---
 	  Enable the suspend to disk (STD) functionality, which is usually
 	  called "hibernation" in user interfaces.  STD checkpoints the

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,

kernel/power/power.h

 #include <linux/suspend.h>
+#include <linux/suspend_ioctls.h>
 #include <linux/utsname.h>
+#include <linux/freezer.h>
 
 struct swsusp_info {
 	struct new_utsname	uts;
@@ -128,42 +130,12 @@ struct snapshot_handle {
 #define data_of(handle)	((handle).buffer + (handle).buf_offset)
 
 extern unsigned int snapshot_additional_pages(struct zone *zone);
+extern unsigned long snapshot_get_image_size(void);
 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 
-/*
- * This structure is used to pass the values needed for the identification
- * of the resume swap area from a user space to the kernel via the
- * SNAPSHOT_SET_SWAP_AREA ioctl
- */
-struct resume_swap_area {
-	loff_t offset;
-	u_int32_t dev;
-} __attribute__((packed));
-
-#define SNAPSHOT_IOC_MAGIC	'3'
-#define SNAPSHOT_FREEZE			_IO(SNAPSHOT_IOC_MAGIC, 1)
-#define SNAPSHOT_UNFREEZE		_IO(SNAPSHOT_IOC_MAGIC, 2)
-#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
-#define SNAPSHOT_ATOMIC_RESTORE		_IO(SNAPSHOT_IOC_MAGIC, 4)
-#define SNAPSHOT_FREE			_IO(SNAPSHOT_IOC_MAGIC, 5)
-#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
-#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
-#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
-#define SNAPSHOT_FREE_SWAP_PAGES	_IO(SNAPSHOT_IOC_MAGIC, 9)
-#define SNAPSHOT_SET_SWAP_FILE		_IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
-#define SNAPSHOT_S2RAM			_IO(SNAPSHOT_IOC_MAGIC, 11)
-#define SNAPSHOT_PMOPS			_IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
-#define SNAPSHOT_SET_SWAP_AREA		_IOW(SNAPSHOT_IOC_MAGIC, 13, \
-							struct resume_swap_area)
-#define SNAPSHOT_IOC_MAXNR	13
-
-#define PMOPS_PREPARE	1
-#define PMOPS_ENTER	2
-#define PMOPS_FINISH	3
-
 /* If unset, the snapshot device cannot be open. */
 extern atomic_t snapshot_device_available;
 
@@ -181,7 +153,6 @@ extern int swsusp_swap_in_use(void);
 extern int swsusp_check(void);
 extern int swsusp_shrink_memory(void);
 extern void swsusp_free(void);
-extern int swsusp_resume(void);
 extern int swsusp_read(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
 extern void swsusp_close(void);
@@ -201,11 +172,56 @@ static inline int suspend_devices_and_enter(suspend_state_t state)
 }
 #endif /* !CONFIG_SUSPEND */
 
-/* kernel/power/common.c */
-extern struct blocking_notifier_head pm_chain_head;
+#ifdef CONFIG_PM_SLEEP
+/* kernel/power/main.c */
+extern int pm_notifier_call_chain(unsigned long val);
+#endif
+
+#ifdef CONFIG_HIGHMEM
+unsigned int count_highmem_pages(void);
+int restore_highmem(void);
+#else
+static inline unsigned int count_highmem_pages(void) { return 0; }
+static inline int restore_highmem(void) { return 0; }
+#endif
+
+/*
+ * Suspend test levels
+ */
+enum {
+	/* keep first */
+	TEST_NONE,
+	TEST_CORE,
+	TEST_CPUS,
+	TEST_PLATFORM,
+	TEST_DEVICES,
+	TEST_FREEZER,
+	/* keep last */
+	__TEST_AFTER_LAST
+};
+
+#define TEST_FIRST	TEST_NONE
+#define TEST_MAX	(__TEST_AFTER_LAST - 1)
+
+extern int pm_test_level;
+
+#ifdef CONFIG_SUSPEND_FREEZER
+static inline int suspend_freeze_processes(void)
+{
+	return freeze_processes();
+}
 
-static inline int pm_notifier_call_chain(unsigned long val)
+static inline void suspend_thaw_processes(void)
 {
-	return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
-			== NOTIFY_BAD) ? -EINVAL : 0;
+	thaw_processes();
 }
+#else
+static inline int suspend_freeze_processes(void)
+{
+	return 0;
+}
+
+static inline void suspend_thaw_processes(void)
+{
+}
+#endif

kernel/power/snapshot.c

@@ -635,7 +635,7 @@ __register_nosave_region(unsigned long start_pfn, unsigned long end_pfn,
 	region->end_pfn = end_pfn;
 	list_add_tail(&region->list, &nosave_regions);
  Report:
-	printk("swsusp: Registered nosave memory region: %016lx - %016lx\n",
+	printk(KERN_INFO "PM: Registered nosave memory: %016lx - %016lx\n",
 		start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
 }
 
@@ -704,7 +704,7 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
 	list_for_each_entry(region, &nosave_regions, list) {
 		unsigned long pfn;
 
-		printk("swsusp: Marking nosave pages: %016lx - %016lx\n",
+		pr_debug("PM: Marking nosave pages: %016lx - %016lx\n",
 				region->start_pfn << PAGE_SHIFT,
 				region->end_pfn << PAGE_SHIFT);
 
@@ -749,7 +749,7 @@ int create_basic_memory_bitmaps(void)
 	free_pages_map = bm2;
 	mark_nosave_pages(forbidden_pages_map);
 
-	printk("swsusp: Basic memory bitmaps created\n");
+	pr_debug("PM: Basic memory bitmaps created\n");
 
 	return 0;
 
@@ -784,7 +784,7 @@ void free_basic_memory_bitmaps(void)
 	memory_bm_free(bm2, PG_UNSAFE_CLEAR);
 	kfree(bm2);
 
-	printk("swsusp: Basic memory bitmaps freed\n");
+	pr_debug("PM: Basic memory bitmaps freed\n");
 }
 
 /**
@@ -872,7 +872,6 @@ unsigned int count_highmem_pages(void)
 }
 #else
 static inline void *saveable_highmem_page(unsigned long pfn) { return NULL; }
-static inline unsigned int count_highmem_pages(void) { return 0; }
 #endif /* CONFIG_HIGHMEM */
 
 /**
@@ -1089,7 +1088,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
 	}
 
 	nr_pages += count_pages_for_highmem(nr_highmem);
-	pr_debug("swsusp: Normal pages needed: %u + %u + %u, available pages: %u\n",
+	pr_debug("PM: Normal pages needed: %u + %u + %u, available pages: %u\n",
 		nr_pages, PAGES_FOR_IO, meta, free);
 
 	return free > nr_pages + PAGES_FOR_IO + meta;
@@ -1202,20 +1201,20 @@ asmlinkage int swsusp_save(void)
 {
 	unsigned int nr_pages, nr_highmem;
 
-	printk("swsusp: critical section: \n");
+	printk(KERN_INFO "PM: Creating hibernation image: \n");
 
 	drain_local_pages();
 	nr_pages = count_data_pages();
 	nr_highmem = count_highmem_pages();
-	printk("swsusp: Need to copy %u pages\n", nr_pages + nr_highmem);
+	printk(KERN_INFO "PM: Need to copy %u pages\n", nr_pages + nr_highmem);
 
 	if (!enough_free_mem(nr_pages, nr_highmem)) {
-		printk(KERN_ERR "swsusp: Not enough free memory\n");
+		printk(KERN_ERR "PM: Not enough free memory\n");
 		return -ENOMEM;
 	}
 
 	if (swsusp_alloc(&orig_bm, &copy_bm, nr_pages, nr_highmem)) {
-		printk(KERN_ERR "swsusp: Memory allocation failed\n");
+		printk(KERN_ERR "PM: Memory allocation failed\n");
 		return -ENOMEM;
 	}
 
@@ -1235,7 +1234,8 @@ asmlinkage int swsusp_save(void)
 	nr_copy_pages = nr_pages;
 	nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE);
 
-	printk("swsusp: critical section: done (%d pages copied)\n", nr_pages);
+	printk(KERN_INFO "PM: Hibernation image created (%d pages copied)\n",
+		nr_pages);
 
 	return 0;
 }
@@ -1264,12 +1264,17 @@ static char *check_image_kernel(struct swsusp_info *info)
 }
 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 
+unsigned long snapshot_get_image_size(void)
+{
+	return nr_copy_pages + nr_meta_pages + 1;
+}
+
 static int init_header(struct swsusp_info *info)
 {
 	memset(info, 0, sizeof(struct swsusp_info));
 	info->num_physpages = num_physpages;
 	info->image_pages = nr_copy_pages;
-	info->pages = nr_copy_pages + nr_meta_pages + 1;
+	info->pages = snapshot_get_image_size();
 	info->size = info->pages;
 	info->size <<= PAGE_SHIFT;
 	return init_header_complete(info);
@@ -1429,7 +1434,7 @@ static int check_header(struct swsusp_info *info)
 	if (!reason && info->num_physpages != num_physpages)
 		reason = "memory size";
 	if (reason) {
-		printk(KERN_ERR "swsusp: Resume mismatch: %s\n", reason);
+		printk(KERN_ERR "PM: Image mismatch: %s\n", reason);
 		return -EPERM;
 	}
 	return 0;

kernel/power/swap.c

@@ -28,8 +28,6 @@
 
 #include "power.h"
 
-extern char resume_file[];
-
 #define SWSUSP_SIG	"S1SUSPEND"
 
 struct swsusp_header {
@@ -73,7 +71,8 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
 	bio->bi_end_io = end_swap_bio_read;
 
 	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
-		printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
+		printk(KERN_ERR "PM: Adding page to bio failed at %ld\n",
+			page_off);
 		bio_put(bio);
 		return -EFAULT;
 	}
@@ -153,7 +152,7 @@ static int mark_swapfiles(sector_t start, unsigned int flags)
 		error = bio_write_page(swsusp_resume_block,
 					swsusp_header, NULL);
 	} else {
-		printk(KERN_ERR "swsusp: Swap header not found!\n");
+		printk(KERN_ERR "PM: Swap header not found!\n");
 		error = -ENODEV;
 	}
 	return error;
@@ -325,7 +324,8 @@ static int save_image(struct swap_map_handle *handle,
 	struct timeval start;
 	struct timeval stop;
 
-	printk("Saving image data pages (%u pages) ...     ", nr_to_write);
+	printk(KERN_INFO "PM: Saving image data pages (%u pages) ...     ",
+		nr_to_write);
 	m = nr_to_write / 100;
 	if (!m)
 		m = 1;
@@ -365,7 +365,7 @@ static int enough_swap(unsigned int nr_pages)
 {
 	unsigned int free_swap = count_swap_pages(root_swap, 1);
 
-	pr_debug("swsusp: free swap pages: %u\n", free_swap);
+	pr_debug("PM: Free swap pages: %u\n", free_swap);
 	return free_swap > nr_pages + PAGES_FOR_IO;
 }
 
@@ -388,7 +388,7 @@ int swsusp_write(unsigned int flags)
 
 	error = swsusp_swap_check();
 	if (error) {
-		printk(KERN_ERR "swsusp: Cannot find swap device, try "
+		printk(KERN_ERR "PM: Cannot find swap device, try "
 				"swapon -a.\n");
 		return error;
 	}
@@ -402,7 +402,7 @@ int swsusp_write(unsigned int flags)
 	}
 	header = (struct swsusp_info *)data_of(snapshot);
 	if (!enough_swap(header->pages)) {
-		printk(KERN_ERR "swsusp: Not enough free swap\n");
+		printk(KERN_ERR "PM: Not enough free swap\n");
 		error = -ENOSPC;
 		goto out;
 	}
@@ -417,7 +417,7 @@ int swsusp_write(unsigned int flags)
 
 		if (!error) {
 			flush_swap_writer(&handle);
-			printk("S");
+			printk(KERN_INFO "PM: S");
 			error = mark_swapfiles(start, flags);
 			printk("|\n");
 		}
@@ -507,7 +507,8 @@ static int load_image(struct swap_map_handle *handle,
 	int err2;
 	unsigned nr_pages;
 
-	printk("Loading image data pages (%u pages) ...     ", nr_to_read);
+	printk(KERN_INFO "PM: Loading image data pages (%u pages) ...     ",
+		nr_to_read);
 	m = nr_to_read / 100;
 	if (!m)
 		m = 1;
@@ -558,7 +559,7 @@ int swsusp_read(unsigned int *flags_p)
 
 	*flags_p = swsusp_header->flags;
 	if (IS_ERR(resume_bdev)) {
-		pr_debug("swsusp: block device not initialised\n");
+		pr_debug("PM: Image device not initialised\n");
 		return PTR_ERR(resume_bdev);
 	}
 
@@ -577,9 +578,9 @@ int swsusp_read(unsigned int *flags_p)
 	blkdev_put(resume_bdev);
 
 	if (!error)
-		pr_debug("swsusp: Reading resume file was successful\n");
+		pr_debug("PM: Image successfully loaded\n");
 	else
-		pr_debug("swsusp: Error %d resuming\n", error);
+		pr_debug("PM: Error %d resuming\n", error);
 	return error;
 }
 
@@ -611,13 +612,13 @@ int swsusp_check(void)
 		if (error)
 			blkdev_put(resume_bdev);
 		else
-			pr_debug("swsusp: Signature found, resuming\n");
+			pr_debug("PM: Signature found, resuming\n");
 	} else {
 		error = PTR_ERR(resume_bdev);
 	}
 
 	if (error)
-		pr_debug("swsusp: Error %d check for resume file\n", error);
+		pr_debug("PM: Error %d checking image file\n", error);
 
 	return error;
 }
@@ -629,7 +630,7 @@ int swsusp_check(void)
 void swsusp_close(void)
 {
 	if (IS_ERR(resume_bdev)) {
-		pr_debug("swsusp: block device not initialised\n");
+		pr_debug("PM: Image device not initialised\n");
 		return;
 	}
 

kernel/power/swsusp.c

@@ -64,14 +64,6 @@ unsigned long image_size = 500 * 1024 * 1024;
 
 int in_suspend __nosavedata = 0;
 
-#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void);
-int restore_highmem(void);
-#else
-static inline int restore_highmem(void) { return 0; }
-static inline unsigned int count_highmem_pages(void) { return 0; }
-#endif
-
 /**
  *	The following functions are used for tracing the allocated
  *	swap pages, so that they can be freed in case of an error.
@@ -196,7 +188,8 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
 		centisecs = 1;	/* avoid div-by-zero */
 	k = nr_pages * (PAGE_SIZE / 1024);
 	kps = (k * 100) / centisecs;
-	printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
+	printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
+			msg, k,
 			centisecs / 100, centisecs % 100,
 			kps / 1000, (kps % 1000) / 10);
 }
@@ -227,7 +220,7 @@ int swsusp_shrink_memory(void)
 	char *p = "-\\|/";
 	struct timeval start, stop;
 
-	printk("Shrinking memory...  ");
+	printk(KERN_INFO "PM: Shrinking memory...  ");
 	do_gettimeofday(&start);
 	do {
 		long size, highmem_size;
@@ -269,38 +262,3 @@ int swsusp_shrink_memory(void)
 
 	return 0;
 }
-
-int swsusp_resume(void)
-{
-	int error;
-
-	local_irq_disable();
-	/* NOTE:  device_power_down() is just a suspend() with irqs off;
-	 * it has no special "power things down" semantics
-	 */
-	if (device_power_down(PMSG_PRETHAW))
-		printk(KERN_ERR "Some devices failed to power down, very bad\n");
-	/* We'll ignore saved state, but this gets preempt count (etc) right */
-	save_processor_state();
-	error = restore_highmem();
-	if (!error) {
-		error = swsusp_arch_resume();
-		/* The code below is only ever reached in case of a failure.
-		 * Otherwise execution continues at place where
-		 * swsusp_arch_suspend() was called
-        	 */
-		BUG_ON(!error);
-		/* This call to restore_highmem() undos the previous one */
-		restore_highmem();
-	}
-	/* The only reason why swsusp_arch_resume() can fail is memory being
-	 * very tight, so we have to free it as soon as we can to avoid
-	 * subsequent failures
-	 */
-	swsusp_free();
-	restore_processor_state();
-	touch_softlockup_watchdog();
-	device_power_up();
-	local_irq_enable();
-	return error;
-}

kernel/power/user.c

@@ -28,6 +28,29 @@
 
 #include "power.h"
 
+/*
+ * NOTE: The SNAPSHOT_SET_SWAP_FILE and SNAPSHOT_PMOPS ioctls are obsolete and
+ * will be removed in the future.  They are only preserved here for
+ * compatibility with existing userland utilities.
+ */
+#define SNAPSHOT_SET_SWAP_FILE	_IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
+#define SNAPSHOT_PMOPS		_IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
+
+#define PMOPS_PREPARE	1
+#define PMOPS_ENTER	2
+#define PMOPS_FINISH	3
+
+/*
+ * NOTE: The following ioctl definitions are wrong and have been replaced with
+ * correct ones.  They are only preserved here for compatibility with existing
+ * userland utilities and will be removed in the future.
+ */
+#define SNAPSHOT_ATOMIC_SNAPSHOT	_IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
+#define SNAPSHOT_SET_IMAGE_SIZE		_IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
+#define SNAPSHOT_AVAIL_SWAP		_IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
+#define SNAPSHOT_GET_SWAP_PAGE		_IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
+
+
 #define SNAPSHOT_MINOR	231
 
 static struct snapshot_data {
@@ -36,7 +59,7 @@ static struct snapshot_data {
 	int mode;
 	char frozen;
 	char ready;
-	char platform_suspend;
+	char platform_support;
 } snapshot_state;
 
 atomic_t snapshot_device_available = ATOMIC_INIT(1);
@@ -44,6 +67,7 @@ atomic_t snapshot_device_available = ATOMIC_INIT(1);
 static int snapshot_open(struct inode *inode, struct file *filp)
 {
 	struct snapshot_data *data;
+	int error;
 
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0))
 		return -EBUSY;
@@ -64,13 +88,23 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 		data->swap = swsusp_resume_device ?
 			swap_type_of(swsusp_resume_device, 0, NULL) : -1;
 		data->mode = O_RDONLY;
+		error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+		if (error)
+			pm_notifier_call_chain(PM_POST_RESTORE);
 	} else {
 		data->swap = -1;
 		data->mode = O_WRONLY;
+		error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+		if (error)
+			pm_notifier_call_chain(PM_POST_HIBERNATION);
+	}
+	if (error) {
+		atomic_inc(&snapshot_device_available);
+		return error;
 	}
 	data->frozen = 0;
 	data->ready = 0;
-	data->platform_suspend = 0;
+	data->platform_support = 0;
 
 	return 0;
 }
@@ -88,6 +122,8 @@ static int snapshot_release(struct inode *inode, struct file *filp)
 		thaw_processes();
 		mutex_unlock(&pm_mutex);
 	}
+	pm_notifier_call_chain(data->mode == O_WRONLY ?
+			PM_POST_HIBERNATION : PM_POST_RESTORE);
 	atomic_inc(&snapshot_device_available);
 	return 0;
 }
@@ -133,7 +169,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 {
 	int error = 0;
 	struct snapshot_data *data;
-	loff_t avail;
+	loff_t size;
 	sector_t offset;
 
 	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
@@ -151,18 +187,13 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 		if (data->frozen)
 			break;
 		mutex_lock(&pm_mutex);
-		error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
-		if (!error) {
-			printk("Syncing filesystems ... ");
-			sys_sync();
-			printk("done.\n");
-
-			error = freeze_processes();
-			if (error)
-				thaw_processes();
-		}
+		printk("Syncing filesystems ... ");
+		sys_sync();
+		printk("done.\n");
+
+		error = freeze_processes();
 		if (error)
-			pm_notifier_call_chain(PM_POST_HIBERNATION);
+			thaw_processes();
 		mutex_unlock(&pm_mutex);
 		if (!error)
 			data->frozen = 1;
@@ -173,19 +204,19 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 			break;
 		mutex_lock(&pm_mutex);
 		thaw_processes();
-		pm_notifier_call_chain(PM_POST_HIBERNATION);
 		mutex_unlock(&pm_mutex);
 		data->frozen = 0;
 		break;
 
+	case SNAPSHOT_CREATE_IMAGE:
 	case SNAPSHOT_ATOMIC_SNAPSHOT:
 		if (data->mode != O_RDONLY || !data->frozen  || data->ready) {
 			error = -EPERM;
 			break;
 		}
-		error = hibernation_snapshot(data->platform_suspend);
+		error = hibernation_snapshot(data->platform_support);
 		if (!error)
-			error = put_user(in_suspend, (unsigned int __user *)arg);
+			error = put_user(in_suspend, (int __user *)arg);
 		if (!error)
 			data->ready = 1;
 		break;
@@ -197,7 +228,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 			error = -EPERM;
 			break;
 		}
-		error = hibernation_restore(data->platform_suspend);
+		error = hibernation_restore(data->platform_support);
 		break;
 
 	case SNAPSHOT_FREE:
@@ -206,16 +237,29 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 		data->ready = 0;
 		break;
 
+	case SNAPSHOT_PREF_IMAGE_SIZE:
 	case SNAPSHOT_SET_IMAGE_SIZE:
 		image_size = arg;
 		break;
 
+	case SNAPSHOT_GET_IMAGE_SIZE:
+		if (!data->ready) {
+			error = -ENODATA;
+			break;
+		}
+		size = snapshot_get_image_size();
+		size <<= PAGE_SHIFT;
+		error = put_user(size, (loff_t __user *)arg);
+		break;
+
+	case SNAPSHOT_AVAIL_SWAP_SIZE:
 	case SNAPSHOT_AVAIL_SWAP:
-		avail = count_swap_pages(data->swap, 1);
-		avail <<= PAGE_SHIFT;
-		error = put_user(avail, (loff_t __user *)arg);
+		size = count_swap_pages(data->swap, 1);
+		size <<= PAGE_SHIFT;
+		error = put_user(size, (loff_t __user *)arg);
 		break;
 
+	case SNAPSHOT_ALLOC_SWAP_PAGE:
 	case SNAPSHOT_GET_SWAP_PAGE:
 		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
 			error = -ENODEV;
@@ -224,7 +268,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 		offset = alloc_swapdev_block(data->swap);
 		if (offset) {
 			offset <<= PAGE_SHIFT;
-			error = put_user(offset, (sector_t __user *)arg);
+			error = put_user(offset, (loff_t __user *)arg);
 		} else {
 			error = -ENOSPC;
 		}
@@ -238,7 +282,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 		free_all_swap_pages(data->swap);
 		break;
 
-	case SNAPSHOT_SET_SWAP_FILE:
+	case SNAPSHOT_SET_SWAP_FILE: /* This ioctl is deprecated */
 		if (!swsusp_swap_in_use()) {
 			/*
 			 * User space encodes device types as two-byte values,
@@ -275,26 +319,33 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
 		mutex_unlock(&pm_mutex);
 		break;
 
-	case SNAPSHOT_PMOPS:
+	case SNAPSHOT_PLATFORM_SUPPORT:
+		data->platform_support = !!arg;
+		break;
+
+	case SNAPSHOT_POWER_OFF:
+		if (data->platform_support)
+			error = hibernation_platform_enter();
+		break;
+
+	case SNAPSHOT_PMOPS: /* This ioctl is deprecated */
 		error = -EINVAL;
 
 		switch (arg) {
 
 		case PMOPS_PREPARE:
-			data->platform_suspend = 1;
+			data->platform_support = 1;
 			error = 0;
 			break;
 
 		case PMOPS_ENTER:
-			if (data->platform_suspend)
+			if (data->platform_support)
 				error = hibernation_platform_enter();
-
 			break;
 
 		case PMOPS_FINISH:
-			if (data->platform_suspend)
+			if (data->platform_support)
 				error = 0;
-
 			break;
 
 		default: