| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # ACPI Configuration |
| # |
| |
| config ARCH_SUPPORTS_ACPI |
| bool |
| |
| menuconfig ACPI |
| bool "ACPI (Advanced Configuration and Power Interface) Support" |
| depends on ARCH_SUPPORTS_ACPI |
| select PNP |
| select NLS |
| default y if X86 |
| help |
| Advanced Configuration and Power Interface (ACPI) support for |
| Linux requires an ACPI-compliant platform (hardware/firmware), |
| and assumes the presence of OS-directed configuration and power |
| management (OSPM) software. This option will enlarge your |
| kernel by about 70K. |
| |
| Linux ACPI provides a robust functional replacement for several |
| legacy configuration and power management interfaces, including |
| the Plug-and-Play BIOS specification (PnP BIOS), the |
| MultiProcessor Specification (MPS), and the Advanced Power |
| Management (APM) specification. If both ACPI and APM support |
| are configured, ACPI is used. |
| |
| The project home page for the Linux ACPI subsystem is here: |
| <https://01.org/linux-acpi> |
| |
| Linux support for ACPI is based on Intel Corporation's ACPI |
| Component Architecture (ACPI CA). For more information on the |
| ACPI CA, see: |
| <https://acpica.org/> |
| |
| ACPI is an open industry specification originally co-developed by |
| Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently, |
| it is developed by the ACPI Specification Working Group (ASWG) under |
| the UEFI Forum and any UEFI member can join the ASWG and contribute |
| to the ACPI specification. |
| The specification is available at: |
| <https://uefi.org/specifications> |
| |
| if ACPI |
| |
| config ACPI_LEGACY_TABLES_LOOKUP |
| bool |
| |
| config ARCH_MIGHT_HAVE_ACPI_PDC |
| bool |
| |
| config ACPI_GENERIC_GSI |
| bool |
| |
| config ACPI_SYSTEM_POWER_STATES_SUPPORT |
| bool |
| |
| config ACPI_CCA_REQUIRED |
| bool |
| |
| config ACPI_DEBUGGER |
| bool "AML debugger interface" |
| select ACPI_DEBUG |
| help |
| Enable in-kernel debugging of AML facilities: statistics, |
| internal object dump, single step control method execution. |
| This is still under development, currently enabling this only |
| results in the compilation of the ACPICA debugger files. |
| |
| if ACPI_DEBUGGER |
| |
| config ACPI_DEBUGGER_USER |
| tristate "Userspace debugger accessiblity" |
| depends on DEBUG_FS |
| help |
| Export /sys/kernel/debug/acpi/acpidbg for userspace utilities |
| to access the debugger functionalities. |
| |
| endif |
| |
| config ACPI_SPCR_TABLE |
| bool "ACPI Serial Port Console Redirection Support" |
| default y if X86 |
| help |
| Enable support for Serial Port Console Redirection (SPCR) Table. |
| This table provides information about the configuration of the |
| earlycon console. |
| |
| config ACPI_FPDT |
| bool "ACPI Firmware Performance Data Table (FPDT) support" |
| depends on X86_64 |
| help |
| Enable support for the Firmware Performance Data Table (FPDT). |
| This table provides information on the timing of the system |
| boot, S3 suspend and S3 resume firmware code paths. |
| |
| config ACPI_LPIT |
| bool |
| depends on X86_64 |
| default y |
| |
| config ACPI_SLEEP |
| bool |
| depends on SUSPEND || HIBERNATION |
| depends on ACPI_SYSTEM_POWER_STATES_SUPPORT |
| default y |
| |
| config ACPI_REV_OVERRIDE_POSSIBLE |
| bool "Allow supported ACPI revision to be overridden" |
| depends on X86 |
| default y |
| help |
| The platform firmware on some systems expects Linux to return "5" as |
| the supported ACPI revision which makes it expose system configuration |
| information in a special way. |
| |
| For example, based on what ACPI exports as the supported revision, |
| Dell XPS 13 (2015) configures its audio device to either work in HDA |
| mode or in I2S mode, where the former is supposed to be used on Linux |
| until the latter is fully supported (in the kernel as well as in user |
| space). |
| |
| This option enables a DMI-based quirk for the above Dell machine (so |
| that HDA audio is exposed by the platform firmware to the kernel) and |
| makes it possible to force the kernel to return "5" as the supported |
| ACPI revision via the "acpi_rev_override" command line switch. |
| |
| config ACPI_EC_DEBUGFS |
| tristate "EC read/write access through /sys/kernel/debug/ec" |
| help |
| Say N to disable Embedded Controller /sys/kernel/debug interface |
| |
| Be aware that using this interface can confuse your Embedded |
| Controller in a way that a normal reboot is not enough. You then |
| have to power off your system, and remove the laptop battery for |
| some seconds. |
| An Embedded Controller typically is available on laptops and reads |
| sensor values like battery state and temperature. |
| The kernel accesses the EC through ACPI parsed code provided by BIOS |
| tables. This option allows to access the EC directly without ACPI |
| code being involved. |
| Thus this option is a debug option that helps to write ACPI drivers |
| and can be used to identify ACPI code or EC firmware bugs. |
| |
| config ACPI_AC |
| tristate "AC Adapter" |
| select POWER_SUPPLY |
| default y |
| help |
| This driver supports the AC Adapter object, which indicates |
| whether a system is on AC or not. If you have a system that can |
| switch between A/C and battery, say Y. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called ac. |
| |
| config ACPI_BATTERY |
| tristate "Battery" |
| select POWER_SUPPLY |
| default y |
| help |
| This driver adds support for battery information through |
| /proc/acpi/battery. If you have a mobile system with a battery, |
| say Y. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called battery. |
| |
| config ACPI_BUTTON |
| tristate "Button" |
| depends on INPUT |
| default y |
| help |
| This driver handles events on the power, sleep, and lid buttons. |
| A daemon reads events from input devices or via netlink and |
| performs user-defined actions such as shutting down the system. |
| This is necessary for software-controlled poweroff. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called button. |
| |
| config ACPI_TINY_POWER_BUTTON |
| tristate "Tiny Power Button Driver" |
| depends on !ACPI_BUTTON |
| help |
| This driver provides a tiny alternative to the ACPI Button driver. |
| The tiny power button driver only handles the power button. Rather |
| than notifying userspace via the input layer or a netlink event, this |
| driver directly signals the init process to shut down. |
| |
| This driver is particularly suitable for cloud and VM environments, |
| which use a simulated power button to initiate a controlled poweroff, |
| but which may not want to run a separate userspace daemon to process |
| input events. |
| |
| config ACPI_TINY_POWER_BUTTON_SIGNAL |
| int "Tiny Power Button Signal" |
| depends on ACPI_TINY_POWER_BUTTON |
| default 38 |
| help |
| Default signal to send to init in response to the power button. |
| |
| Likely values here include 38 (SIGRTMIN+4) to power off, or 2 |
| (SIGINT) to simulate Ctrl+Alt+Del. |
| |
| config ACPI_VIDEO |
| tristate "Video" |
| depends on X86 && BACKLIGHT_CLASS_DEVICE |
| depends on INPUT |
| select THERMAL |
| help |
| This driver implements the ACPI Extensions For Display Adapters |
| for integrated graphics devices on motherboard, as specified in |
| ACPI 2.0 Specification, Appendix B. This supports basic operations |
| such as defining the video POST device, retrieving EDID information, |
| and setting up a video output. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called video. |
| |
| config ACPI_FAN |
| tristate "Fan" |
| depends on THERMAL |
| default y |
| help |
| This driver supports ACPI fan devices, allowing user-mode |
| applications to perform basic fan control (on, off, status). |
| |
| To compile this driver as a module, choose M here: |
| the module will be called fan. |
| |
| config ACPI_TAD |
| tristate "ACPI Time and Alarm (TAD) Device Support" |
| depends on SYSFS && PM_SLEEP |
| help |
| The ACPI Time and Alarm (TAD) device is an alternative to the Real |
| Time Clock (RTC). Its wake timers allow the system to transition from |
| the S3 (or optionally S4/S5) state to S0 state after a time period |
| elapses. In comparison with the RTC Alarm, the TAD provides a larger |
| scale of flexibility in the wake timers. The time capabilities of the |
| TAD maintain the time of day information across platform power |
| transitions, and keep track of time even when the platform is turned |
| off. |
| |
| config ACPI_DOCK |
| bool "Dock" |
| help |
| This driver supports ACPI-controlled docking stations and removable |
| drive bays such as the IBM Ultrabay and the Dell Module Bay. |
| |
| config ACPI_CPU_FREQ_PSS |
| bool |
| select THERMAL |
| |
| config ACPI_PROCESSOR_CSTATE |
| def_bool y |
| depends on ACPI_PROCESSOR |
| depends on IA64 || X86 |
| |
| config ACPI_PROCESSOR_IDLE |
| bool |
| select CPU_IDLE |
| |
| config ACPI_MCFG |
| bool |
| |
| config ACPI_CPPC_LIB |
| bool |
| depends on ACPI_PROCESSOR |
| select MAILBOX |
| select PCC |
| help |
| If this option is enabled, this file implements common functionality |
| to parse CPPC tables as described in the ACPI 5.1+ spec. The |
| routines implemented are meant to be used by other |
| drivers to control CPU performance using CPPC semantics. |
| If your platform does not support CPPC in firmware, |
| leave this option disabled. |
| |
| config ACPI_PROCESSOR |
| tristate "Processor" |
| depends on X86 || IA64 || ARM64 |
| select ACPI_PROCESSOR_IDLE |
| select ACPI_CPU_FREQ_PSS if X86 || IA64 |
| default y |
| help |
| This driver adds support for the ACPI Processor package. It is required |
| by several flavors of cpufreq performance-state, thermal, throttling and |
| idle drivers. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called processor. |
| |
| config ACPI_IPMI |
| tristate "IPMI" |
| depends on IPMI_HANDLER |
| help |
| This driver enables the ACPI to access the BMC controller. And it |
| uses the IPMI request/response message to communicate with BMC |
| controller, which can be found on on the server. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called as acpi_ipmi. |
| |
| config ACPI_HOTPLUG_CPU |
| bool |
| depends on ACPI_PROCESSOR && HOTPLUG_CPU |
| select ACPI_CONTAINER |
| default y |
| |
| config ACPI_PROCESSOR_AGGREGATOR |
| tristate "Processor Aggregator" |
| depends on ACPI_PROCESSOR |
| depends on X86 |
| help |
| ACPI 4.0 defines processor Aggregator, which enables OS to perform |
| specific processor configuration and control that applies to all |
| processors in the platform. Currently only logical processor idling |
| is defined, which is to reduce power consumption. This driver |
| supports the new device. |
| |
| config ACPI_THERMAL |
| tristate "Thermal Zone" |
| depends on ACPI_PROCESSOR |
| select THERMAL |
| default y |
| help |
| This driver supports ACPI thermal zones. Most mobile and |
| some desktop systems support ACPI thermal zones. It is HIGHLY |
| recommended that this option be enabled, as your processor(s) |
| may be damaged without it. |
| |
| To compile this driver as a module, choose M here: |
| the module will be called thermal. |
| |
| config ACPI_CUSTOM_DSDT_FILE |
| string "Custom DSDT Table file to include" |
| default "" |
| depends on !STANDALONE |
| help |
| This option supports a custom DSDT by linking it into the kernel. |
| See Documentation/admin-guide/acpi/dsdt-override.rst |
| |
| Enter the full path name to the file which includes the AmlCode |
| or dsdt_aml_code declaration. |
| |
| If unsure, don't enter a file name. |
| |
| config ACPI_CUSTOM_DSDT |
| bool |
| default ACPI_CUSTOM_DSDT_FILE != "" |
| |
| config ARCH_HAS_ACPI_TABLE_UPGRADE |
| def_bool n |
| |
| config ACPI_TABLE_UPGRADE |
| bool "Allow upgrading ACPI tables via initrd" |
| depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE |
| default y |
| help |
| This option provides functionality to upgrade arbitrary ACPI tables |
| via initrd. No functional change if no ACPI tables are passed via |
| initrd, therefore it's safe to say Y. |
| See Documentation/admin-guide/acpi/initrd_table_override.rst for details |
| |
| config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD |
| bool "Override ACPI tables from built-in initrd" |
| depends on ACPI_TABLE_UPGRADE |
| depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION="" |
| help |
| This option provides functionality to override arbitrary ACPI tables |
| from built-in uncompressed initrd. |
| |
| See Documentation/admin-guide/acpi/initrd_table_override.rst for details |
| |
| config ACPI_DEBUG |
| bool "Debug Statements" |
| help |
| The ACPI subsystem can produce debug output. Saying Y enables this |
| output and increases the kernel size by around 50K. |
| |
| Use the acpi.debug_layer and acpi.debug_level kernel command-line |
| parameters documented in Documentation/firmware-guide/acpi/debug.rst and |
| Documentation/admin-guide/kernel-parameters.rst to control the type and |
| amount of debug output. |
| |
| config ACPI_PCI_SLOT |
| bool "PCI slot detection driver" |
| depends on SYSFS && PCI |
| help |
| This driver creates entries in /sys/bus/pci/slots/ for all PCI |
| slots in the system. This can help correlate PCI bus addresses, |
| i.e., segment/bus/device/function tuples, with physical slots in |
| the system. If you are unsure, say N. |
| |
| config ACPI_CONTAINER |
| bool "Container and Module Devices" |
| default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) |
| help |
| This driver supports ACPI Container and Module devices (IDs |
| ACPI0004, PNP0A05, and PNP0A06). |
| |
| This helps support hotplug of nodes, CPUs, and memory. |
| |
| config ACPI_HOTPLUG_MEMORY |
| bool "Memory Hotplug" |
| depends on MEMORY_HOTPLUG |
| help |
| This driver supports ACPI memory hotplug. The driver |
| fields notifications on ACPI memory devices (PNP0C80), |
| which represent memory ranges that may be onlined or |
| offlined during runtime. |
| |
| If your hardware and firmware do not support adding or |
| removing memory devices at runtime, you need not enable |
| this driver. |
| |
| config ACPI_HOTPLUG_IOAPIC |
| bool |
| depends on PCI |
| depends on X86_IO_APIC |
| default y |
| |
| config ACPI_SBS |
| tristate "Smart Battery System" |
| depends on X86 |
| select POWER_SUPPLY |
| help |
| This driver supports the Smart Battery System, another |
| type of access to battery information, found on some laptops. |
| |
| To compile this driver as a module, choose M here: |
| the modules will be called sbs and sbshc. |
| |
| config ACPI_HED |
| tristate "Hardware Error Device" |
| help |
| This driver supports the Hardware Error Device (PNP0C33), |
| which is used to report some hardware errors notified via |
| SCI, mainly the corrected errors. |
| |
| config ACPI_CUSTOM_METHOD |
| tristate "Allow ACPI methods to be inserted/replaced at run time" |
| depends on DEBUG_FS |
| help |
| This debug facility allows ACPI AML methods to be inserted and/or |
| replaced without rebooting the system. For details refer to: |
| Documentation/firmware-guide/acpi/method-customizing.rst. |
| |
| NOTE: This option is security sensitive, because it allows arbitrary |
| kernel memory to be written to by root (uid=0) users, allowing them |
| to bypass certain security measures (e.g. if root is not allowed to |
| load additional kernel modules after boot, this feature may be used |
| to override that restriction). |
| |
| config ACPI_BGRT |
| bool "Boottime Graphics Resource Table support" |
| depends on EFI && (X86 || ARM64) |
| help |
| This driver adds support for exposing the ACPI Boottime Graphics |
| Resource Table, which allows the operating system to obtain |
| data from the firmware boot splash. It will appear under |
| /sys/firmware/acpi/bgrt/ . |
| |
| config ACPI_REDUCED_HARDWARE_ONLY |
| bool "Hardware-reduced ACPI support only" if EXPERT |
| def_bool n |
| help |
| This config item changes the way the ACPI code is built. When this |
| option is selected, the kernel will use a specialized version of |
| ACPICA that ONLY supports the ACPI "reduced hardware" mode. The |
| resulting kernel will be smaller but it will also be restricted to |
| running in ACPI reduced hardware mode ONLY. |
| |
| If you are unsure what to do, do not enable this option. |
| |
| source "drivers/acpi/nfit/Kconfig" |
| source "drivers/acpi/numa/Kconfig" |
| source "drivers/acpi/apei/Kconfig" |
| source "drivers/acpi/dptf/Kconfig" |
| |
| config ACPI_WATCHDOG |
| bool |
| |
| config ACPI_EXTLOG |
| tristate "Extended Error Log support" |
| depends on X86_MCE && X86_LOCAL_APIC && EDAC |
| select UEFI_CPER |
| help |
| Certain usages such as Predictive Failure Analysis (PFA) require |
| more information about the error than what can be described in |
| processor machine check banks. Most server processors log |
| additional information about the error in processor uncore |
| registers. Since the addresses and layout of these registers vary |
| widely from one processor to another, system software cannot |
| readily make use of them. To complicate matters further, some of |
| the additional error information cannot be constructed without |
| detailed knowledge about platform topology. |
| |
| Enhanced MCA Logging allows firmware to provide additional error |
| information to system software, synchronous with MCE or CMCI. This |
| driver adds support for that functionality with corresponding |
| tracepoint which carries that information to userspace. |
| |
| config ACPI_ADXL |
| bool |
| |
| config ACPI_CONFIGFS |
| tristate "ACPI configfs support" |
| select CONFIGFS_FS |
| help |
| Select this option to enable support for ACPI configuration from |
| userspace. The configurable ACPI groups will be visible under |
| /config/acpi, assuming configfs is mounted under /config. |
| |
| if ARM64 |
| source "drivers/acpi/arm64/Kconfig" |
| |
| config ACPI_PPTT |
| bool |
| endif |
| |
| source "drivers/acpi/pmic/Kconfig" |
| |
| endif # ACPI |
| |
| config X86_PM_TIMER |
| bool "Power Management Timer Support" if EXPERT |
| depends on X86 && (ACPI || JAILHOUSE_GUEST) |
| default y |
| help |
| The Power Management Timer is available on all ACPI-capable, |
| in most cases even if ACPI is unusable or blacklisted. |
| |
| This timing source is not affected by power management features |
| like aggressive processor idling, throttling, frequency and/or |
| voltage scaling, unlike the commonly used Time Stamp Counter |
| (TSC) timing source. |
| |
| You should nearly always say Y here because many modern |
| systems require this timer. |
