linux/kernel/power/Kconfig
Linus Torvalds fb4da215ed pci-v5.3-changes
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Merge tag 'pci-v5.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "Enumeration changes:

   - Evaluate PCI Boot Configuration _DSM to learn if firmware wants us
     to preserve its resource assignments (Benjamin Herrenschmidt)

   - Simplify resource distribution (Nicholas Johnson)

   - Decode 32 GT/s link speed (Gustavo Pimentel)

  Virtualization:

   - Fix incorrect caching of VF config space size (Alex Williamson)

   - Fix VF driver probing sysfs knobs (Alex Williamson)

  Peer-to-peer DMA:

   - Fix dma_virt_ops check (Logan Gunthorpe)

  Altera host bridge driver:

   - Allow building as module (Ley Foon Tan)

  Armada 8K host bridge driver:

   - add PHYs support (Miquel Raynal)

  DesignWare host bridge driver:

   - Export APIs to support removable loadable module (Vidya Sagar)

   - Enable Relaxed Ordering erratum workaround only on Tegra20 &
     Tegra30 (Vidya Sagar)

  Hyper-V host bridge driver:

   - Fix use-after-free in eject (Dexuan Cui)

  Mobiveil host bridge driver:

   - Clean up and fix many issues, including non-identify mapped
     windows, 64-bit windows, multi-MSI, class code, INTx clearing (Hou
     Zhiqiang)

  Qualcomm host bridge driver:

   - Use clk bulk API for 2.4.0 controllers (Bjorn Andersson)

   - Add QCS404 support (Bjorn Andersson)

   - Assert PERST for at least 100ms (Niklas Cassel)

  R-Car host bridge driver:

   - Add r8a774a1 DT support (Biju Das)

  Tegra host bridge driver:

   - Add support for Gen2, opportunistic UpdateFC and ACK (PCIe protocol
     details) AER, GPIO-based PERST# (Manikanta Maddireddy)

   - Fix many issues, including power-on failure cases, interrupt
     masking in suspend, UPHY settings, AFI dynamic clock gating,
     pending DLL transactions (Manikanta Maddireddy)

  Xilinx host bridge driver:

   - Fix NWL Multi-MSI programming (Bharat Kumar Gogada)

  Endpoint support:

   - Fix 64bit BAR support (Alan Mikhak)

   - Fix pcitest build issues (Alan Mikhak, Andy Shevchenko)

  Bug fixes:

   - Fix NVIDIA GPU multi-function power dependencies (Abhishek Sahu)

   - Fix NVIDIA GPU HDA enablement issue (Lukas Wunner)

   - Ignore lockdep for sysfs "remove" (Marek Vasut)

  Misc:

   - Convert docs to reST (Changbin Du, Mauro Carvalho Chehab)"

* tag 'pci-v5.3-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (107 commits)
  PCI: Enable NVIDIA HDA controllers
  tools: PCI: Fix installation when `make tools/pci_install`
  PCI: dwc: pci-dra7xx: Fix compilation when !CONFIG_GPIOLIB
  PCI: Fix typos and whitespace errors
  PCI: mobiveil: Fix INTx interrupt clearing in mobiveil_pcie_isr()
  PCI: mobiveil: Fix infinite-loop in the INTx handling function
  PCI: mobiveil: Move PCIe PIO enablement out of inbound window routine
  PCI: mobiveil: Add upper 32-bit PCI base address setup in inbound window
  PCI: mobiveil: Add upper 32-bit CPU base address setup in outbound window
  PCI: mobiveil: Mask out hardcoded bits in inbound/outbound windows setup
  PCI: mobiveil: Clear the control fields before updating it
  PCI: mobiveil: Add configured inbound windows counter
  PCI: mobiveil: Fix the valid check for inbound and outbound windows
  PCI: mobiveil: Clean-up program_{ib/ob}_windows()
  PCI: mobiveil: Remove an unnecessary return value check
  PCI: mobiveil: Fix error return values
  PCI: mobiveil: Refactor the MEM/IO outbound window initialization
  PCI: mobiveil: Make some register updates more readable
  PCI: mobiveil: Reformat the code for readability
  dt-bindings: PCI: mobiveil: Change gpio_slave and apb_csr to optional
  ...
2019-07-15 20:44:49 -07:00

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# 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. Say Y if that's your case.
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 ARCH_SAVE_PAGE_KEYS
bool
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.