# SPDX-License-Identifier: GPL-2.0-only

  config SUSPEND
  	bool "Suspend to RAM and standby"

  	depends on 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 (e.g. the ACPI S3 state).

  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.
  
  	  Turning OFF this setting is NOT recommended! If in doubt, say Y.

  config SUSPEND_SKIP_SYNC
  	bool "Skip kernel's sys_sync() on suspend to RAM/standby"
  	depends on SUSPEND
  	depends on EXPERT
  	help
  	  Skip the kernel sys_sync() before freezing user processes.
  	  Some systems prefer not to pay this cost on every invocation
  	  of suspend, or they are content with invoking sync() from

  	  user-space before invoking suspend.  There's a run-time switch
  	  at '/sys/power/sync_on_suspend' to configure this behaviour.
  	  This setting changes the default for the run-tim switch. Say Y
  	  to change the default to disable the kernel sys_sync().

  config HIBERNATE_CALLBACKS
  	bool

  config HIBERNATION

  	bool "Hibernation (aka 'suspend to disk')"

  	depends on SWAP && ARCH_HIBERNATION_POSSIBLE

  	select HIBERNATE_CALLBACKS

  	select LZO_COMPRESS
  	select LZO_DECOMPRESS

  	select CRC32

  	help

  	  Enable the suspend to disk (STD) functionality, which is usually
  	  called "hibernation" in user interfaces.  STD checkpoints the
  	  system and powers it off; and restores that checkpoint on reboot.

  	  You can suspend your machine with 'echo disk > /sys/power/state'
  	  after placing resume=/dev/swappartition on the kernel command line
  	  in your bootloader's configuration file.

  	  Alternatively, you can use the additional userland tools available
  	  from <http://suspend.sf.net>.
  
  	  In principle it does not require ACPI or APM, although for example

  	  ACPI will be used for the final steps when it is available.  One
  	  of the reasons to use software suspend is that the firmware hooks
  	  for suspend states like suspend-to-RAM (STR) often don't work very
  	  well with Linux.

  
  	  It creates an image which is saved in your active swap. Upon the next

  	  boot, pass the 'resume=/dev/swappartition' argument to the kernel to
  	  have it detect the saved image, restore memory state from it, and
  	  continue to run as before. If you do not want the previous state to

  	  be reloaded, then use the 'noresume' kernel command line argument.
  	  Note, however, that fsck will be run on your filesystems and you will
  	  need to run mkswap against the swap partition used for the suspend.

  	  It also works with swap files to a limited extent (for details see

  	  <file:Documentation/power/swsusp-and-swap-files.rst>).

  	  Right now you may boot without resuming and resume later but in the
  	  meantime you cannot use the swap partition(s)/file(s) involved in
  	  suspending.  Also in this case you must not use the filesystems
  	  that were mounted before the suspend.  In particular, you MUST NOT
  	  MOUNT any journaled filesystems mounted before the suspend or they
  	  will get corrupted in a nasty way.

  	  For more information take a look at <file:Documentation/power/swsusp.rst>.

  config HIBERNATION_SNAPSHOT_DEV
  	bool "Userspace snapshot device"
  	depends on HIBERNATION
  	default y

  	help

  	  Device used by the uswsusp tools.
  
  	  Say N if no snapshotting from userspace is needed, this also
  	  reduces the attack surface of the kernel.
  
  	  If in doubt, say Y.

  config PM_STD_PARTITION
  	string "Default resume partition"

  	depends on HIBERNATION

  	default ""

  	help

  	  The default resume partition is the partition that the suspend-
  	  to-disk implementation will look for a suspended disk image. 
  
  	  The partition specified here will be different for almost every user. 
  	  It should be a valid swap partition (at least for now) that is turned
  	  on before suspending. 
  
  	  The partition specified can be overridden by specifying:
  
  		resume=/dev/<other device> 
  
  	  which will set the resume partition to the device specified. 
  
  	  Note there is currently not a way to specify which device to save the
  	  suspended image to. It will simply pick the first available swap 
  	  device.

  config PM_SLEEP

  	def_bool y

  	depends on SUSPEND || HIBERNATE_CALLBACKS

  	select PM

  	select SRCU

  
  config PM_SLEEP_SMP

  	def_bool y

  	depends on SMP
  	depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
  	depends on PM_SLEEP

  	select HOTPLUG_CPU

  config PM_SLEEP_SMP_NONZERO_CPU
  	def_bool y
  	depends on PM_SLEEP_SMP
  	depends on ARCH_SUSPEND_NONZERO_CPU

  	help

  	If an arch can suspend (for suspend, hibernate, kexec, etc) on a
  	non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
  	will allow nohz_full mask to include CPU0.

  config PM_AUTOSLEEP
  	bool "Opportunistic sleep"
  	depends on PM_SLEEP
  	default n

  	help

  	Allow the kernel to trigger a system transition into a global sleep
  	state automatically whenever there are no active wakeup sources.

  config PM_WAKELOCKS
  	bool "User space wakeup sources interface"
  	depends on PM_SLEEP
  	default n

  	help

  	Allow user space to create, activate and deactivate wakeup source
  	objects with the help of a sysfs-based interface.

  config PM_WAKELOCKS_LIMIT
  	int "Maximum number of user space wakeup sources (0 = no limit)"
  	range 0 100000
  	default 100
  	depends on PM_WAKELOCKS

  config PM_WAKELOCKS_GC
  	bool "Garbage collector for user space wakeup sources"
  	depends on PM_WAKELOCKS
  	default y

  config PM
  	bool "Device power management core functionality"

  	help

  	  Enable functionality allowing I/O devices to be put into energy-saving

  	  (low power) states, for example after a specified period of inactivity
  	  (autosuspended), and woken up in response to a hardware-generated

  	  wake-up event or a driver's request.
  
  	  Hardware support is generally required for this functionality to work
  	  and the bus type drivers of the buses the devices are on are

  	  responsible for the actual handling of device suspend requests and

  	  wake-up events.

  config PM_DEBUG
  	bool "Power Management Debug Support"
  	depends on PM

  	help

  	This option enables various debugging support in the Power Management
  	code. This is helpful when debugging and reporting PM bugs, like
  	suspend support.

  config PM_ADVANCED_DEBUG
  	bool "Extra PM attributes in sysfs for low-level debugging/testing"
  	depends on PM_DEBUG

  	help

  	Add extra sysfs attributes allowing one to access some Power Management
  	fields of device objects from user space.  If you are not a kernel
  	developer interested in debugging/testing Power Management, say "no".

  config PM_TEST_SUSPEND
  	bool "Test suspend/resume and wakealarm during bootup"
  	depends on SUSPEND && PM_DEBUG && RTC_CLASS=y

  	help

  	This option will let you suspend your machine during bootup, and
  	make it wake up a few seconds later using an RTC wakeup alarm.
  	Enable this with a kernel parameter like "test_suspend=mem".
  
  	You probably want to have your system's RTC driver statically
  	linked, ensuring that it's available when this test runs.

  config PM_SLEEP_DEBUG

  	def_bool y

  	depends on PM_DEBUG && PM_SLEEP

  config DPM_WATCHDOG
  	bool "Device suspend/resume watchdog"

  	depends on PM_DEBUG && PSTORE && EXPERT

  	help

  	  Sets up a watchdog timer to capture drivers that are
  	  locked up attempting to suspend/resume a device.
  	  A detected lockup causes system panic with message
  	  captured in pstore device for inspection in subsequent
  	  boot session.
  
  config DPM_WATCHDOG_TIMEOUT
  	int "Watchdog timeout in seconds"
  	range 1 120

  	default 120

  	depends on DPM_WATCHDOG

  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_SLEEP_DEBUG

  	depends on X86
  	select PM_TRACE

  	help

  	This enables some cheesy code to save the last PM event point in the
  	RTC across reboots, so that you can debug a machine that just hangs
  	during suspend (or more commonly, during resume).
  
  	To use this debugging feature you should attempt to suspend the
  	machine, reboot it and then run
  
  		dmesg -s 1000000 | grep 'hash matches'
  
  	CAUTION: this option will cause your machine's real-time clock to be
  	set to an invalid time after a resume.

  config APM_EMULATION
  	tristate "Advanced Power Management Emulation"

  	depends on SYS_SUPPORTS_APM_EMULATION

  	help
  	  APM is a BIOS specification for saving power using several different
  	  techniques. This is mostly useful for battery powered laptops with
  	  APM compliant BIOSes. If you say Y here, the system time will be
  	  reset after a RESUME operation, the /proc/apm device will provide
  	  battery status information, and user-space programs will receive
  	  notification of APM "events" (e.g. battery status change).
  
  	  In order to use APM, you will need supporting software. For location

  	  and more information, read <file:Documentation/power/apm-acpi.rst>

  	  and the Battery Powered Linux mini-HOWTO, available from

  	  <http://www.tldp.org/docs.html#howto>.
  
  	  This driver does not spin down disk drives (see the hdparm(8)
  	  manpage ("man 8 hdparm") for that), and it doesn't turn off
  	  VESA-compliant "green" monitors.
  
  	  Generally, if you don't have a battery in your machine, there isn't
  	  much point in using this driver and you should say N. If you get
  	  random kernel OOPSes or reboots that don't seem to be related to
  	  anything, try disabling/enabling this option (or disabling/enabling
  	  APM in your BIOS).

  config PM_CLK

  	def_bool y

  	depends on PM && HAVE_CLK

  
  config PM_GENERIC_DOMAINS
  	bool
  	depends on PM

  config WQ_POWER_EFFICIENT_DEFAULT
  	bool "Enable workqueue power-efficient mode by default"
  	depends on PM
  	default n
  	help
  	  Per-cpu workqueues are generally preferred because they show
  	  better performance thanks to cache locality; unfortunately,
  	  per-cpu workqueues tend to be more power hungry than unbound
  	  workqueues.
  
  	  Enabling workqueue.power_efficient kernel parameter makes the
  	  per-cpu workqueues which were observed to contribute
  	  significantly to power consumption unbound, leading to measurably
  	  lower power usage at the cost of small performance overhead.
  
  	  This config option determines whether workqueue.power_efficient
  	  is enabled by default.
  
  	  If in doubt, say N.

  config PM_GENERIC_DOMAINS_SLEEP
  	def_bool y
  	depends on PM_SLEEP && PM_GENERIC_DOMAINS

  config PM_GENERIC_DOMAINS_OF
  	def_bool y

  	depends on PM_GENERIC_DOMAINS && OF

  config CPU_PM
  	bool

  
  config ENERGY_MODEL
  	bool "Energy Model for CPUs"
  	depends on SMP
  	depends on CPU_FREQ
  	default n
  	help
  	  Several subsystems (thermal and/or the task scheduler for example)
  	  can leverage information about the energy consumed by CPUs to make
  	  smarter decisions. This config option enables the framework from
  	  which subsystems can access the energy models.
  
  	  The exact usage of the energy model is subsystem-dependent.
  
  	  If in doubt, say N.