1# SPDX-License-Identifier: GPL-2.0 2# 3# ACPI Configuration 4# 5 6config ARCH_SUPPORTS_ACPI 7 bool 8 9menuconfig ACPI 10 bool "ACPI (Advanced Configuration and Power Interface) Support" 11 depends on ARCH_SUPPORTS_ACPI 12 select PNP 13 select NLS 14 default y if X86 15 help 16 Advanced Configuration and Power Interface (ACPI) support for 17 Linux requires an ACPI-compliant platform (hardware/firmware), 18 and assumes the presence of OS-directed configuration and power 19 management (OSPM) software. This option will enlarge your 20 kernel by about 70K. 21 22 Linux ACPI provides a robust functional replacement for several 23 legacy configuration and power management interfaces, including 24 the Plug-and-Play BIOS specification (PnP BIOS), the 25 MultiProcessor Specification (MPS), and the Advanced Power 26 Management (APM) specification. If both ACPI and APM support 27 are configured, ACPI is used. 28 29 The project home page for the Linux ACPI subsystem is here: 30 <https://01.org/linux-acpi> 31 32 Linux support for ACPI is based on Intel Corporation's ACPI 33 Component Architecture (ACPI CA). For more information on the 34 ACPI CA, see: 35 <https://acpica.org/> 36 37 ACPI is an open industry specification originally co-developed by 38 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently, 39 it is developed by the ACPI Specification Working Group (ASWG) under 40 the UEFI Forum and any UEFI member can join the ASWG and contribute 41 to the ACPI specification. 42 The specification is available at: 43 <https://uefi.org/specifications> 44 45if ACPI 46 47config ACPI_LEGACY_TABLES_LOOKUP 48 bool 49 50config ARCH_MIGHT_HAVE_ACPI_PDC 51 bool 52 53config ACPI_GENERIC_GSI 54 bool 55 56config ACPI_SYSTEM_POWER_STATES_SUPPORT 57 bool 58 59config ACPI_CCA_REQUIRED 60 bool 61 62config ACPI_DEBUGGER 63 bool "AML debugger interface" 64 select ACPI_DEBUG 65 help 66 Enable in-kernel debugging of AML facilities: statistics, 67 internal object dump, single step control method execution. 68 This is still under development, currently enabling this only 69 results in the compilation of the ACPICA debugger files. 70 71if ACPI_DEBUGGER 72 73config ACPI_DEBUGGER_USER 74 tristate "Userspace debugger accessibility" 75 depends on DEBUG_FS 76 help 77 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities 78 to access the debugger functionalities. 79 80endif 81 82config ACPI_SPCR_TABLE 83 bool "ACPI Serial Port Console Redirection Support" 84 default y if X86 85 help 86 Enable support for Serial Port Console Redirection (SPCR) Table. 87 This table provides information about the configuration of the 88 earlycon console. 89 90config ACPI_FPDT 91 bool "ACPI Firmware Performance Data Table (FPDT) support" 92 depends on X86_64 93 help 94 Enable support for the Firmware Performance Data Table (FPDT). 95 This table provides information on the timing of the system 96 boot, S3 suspend and S3 resume firmware code paths. 97 98config ACPI_LPIT 99 bool 100 depends on X86_64 101 default y 102 103config ACPI_SLEEP 104 bool 105 depends on SUSPEND || HIBERNATION 106 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT 107 default y 108 109config ACPI_REV_OVERRIDE_POSSIBLE 110 bool "Allow supported ACPI revision to be overridden" 111 depends on X86 112 default y 113 help 114 The platform firmware on some systems expects Linux to return "5" as 115 the supported ACPI revision which makes it expose system configuration 116 information in a special way. 117 118 For example, based on what ACPI exports as the supported revision, 119 Dell XPS 13 (2015) configures its audio device to either work in HDA 120 mode or in I2S mode, where the former is supposed to be used on Linux 121 until the latter is fully supported (in the kernel as well as in user 122 space). 123 124 This option enables a DMI-based quirk for the above Dell machine (so 125 that HDA audio is exposed by the platform firmware to the kernel) and 126 makes it possible to force the kernel to return "5" as the supported 127 ACPI revision via the "acpi_rev_override" command line switch. 128 129config ACPI_EC_DEBUGFS 130 tristate "EC read/write access through /sys/kernel/debug/ec" 131 help 132 Say N to disable Embedded Controller /sys/kernel/debug interface 133 134 Be aware that using this interface can confuse your Embedded 135 Controller in a way that a normal reboot is not enough. You then 136 have to power off your system, and remove the laptop battery for 137 some seconds. 138 An Embedded Controller typically is available on laptops and reads 139 sensor values like battery state and temperature. 140 The kernel accesses the EC through ACPI parsed code provided by BIOS 141 tables. This option allows to access the EC directly without ACPI 142 code being involved. 143 Thus this option is a debug option that helps to write ACPI drivers 144 and can be used to identify ACPI code or EC firmware bugs. 145 146config ACPI_AC 147 tristate "AC Adapter" 148 select POWER_SUPPLY 149 default y 150 help 151 This driver supports the AC Adapter object, which indicates 152 whether a system is on AC or not. If you have a system that can 153 switch between A/C and battery, say Y. 154 155 To compile this driver as a module, choose M here: 156 the module will be called ac. 157 158config ACPI_BATTERY 159 tristate "Battery" 160 select POWER_SUPPLY 161 default y 162 help 163 This driver adds support for battery information through 164 /proc/acpi/battery. If you have a mobile system with a battery, 165 say Y. 166 167 To compile this driver as a module, choose M here: 168 the module will be called battery. 169 170config ACPI_BUTTON 171 tristate "Button" 172 depends on INPUT 173 default y 174 help 175 This driver handles events on the power, sleep, and lid buttons. 176 A daemon reads events from input devices or via netlink and 177 performs user-defined actions such as shutting down the system. 178 This is necessary for software-controlled poweroff. 179 180 To compile this driver as a module, choose M here: 181 the module will be called button. 182 183config ACPI_TINY_POWER_BUTTON 184 tristate "Tiny Power Button Driver" 185 depends on !ACPI_BUTTON 186 help 187 This driver provides a tiny alternative to the ACPI Button driver. 188 The tiny power button driver only handles the power button. Rather 189 than notifying userspace via the input layer or a netlink event, this 190 driver directly signals the init process to shut down. 191 192 This driver is particularly suitable for cloud and VM environments, 193 which use a simulated power button to initiate a controlled poweroff, 194 but which may not want to run a separate userspace daemon to process 195 input events. 196 197config ACPI_TINY_POWER_BUTTON_SIGNAL 198 int "Tiny Power Button Signal" 199 depends on ACPI_TINY_POWER_BUTTON 200 default 38 201 help 202 Default signal to send to init in response to the power button. 203 204 Likely values here include 38 (SIGRTMIN+4) to power off, or 2 205 (SIGINT) to simulate Ctrl+Alt+Del. 206 207config ACPI_VIDEO 208 tristate "Video" 209 depends on X86 && BACKLIGHT_CLASS_DEVICE 210 depends on INPUT 211 select THERMAL 212 help 213 This driver implements the ACPI Extensions For Display Adapters 214 for integrated graphics devices on motherboard, as specified in 215 ACPI 2.0 Specification, Appendix B. This supports basic operations 216 such as defining the video POST device, retrieving EDID information, 217 and setting up a video output. 218 219 To compile this driver as a module, choose M here: 220 the module will be called video. 221 222config ACPI_FAN 223 tristate "Fan" 224 depends on THERMAL 225 default y 226 help 227 This driver supports ACPI fan devices, allowing user-mode 228 applications to perform basic fan control (on, off, status). 229 230 To compile this driver as a module, choose M here: 231 the module will be called fan. 232 233config ACPI_TAD 234 tristate "ACPI Time and Alarm (TAD) Device Support" 235 depends on SYSFS && PM_SLEEP 236 help 237 The ACPI Time and Alarm (TAD) device is an alternative to the Real 238 Time Clock (RTC). Its wake timers allow the system to transition from 239 the S3 (or optionally S4/S5) state to S0 state after a time period 240 elapses. In comparison with the RTC Alarm, the TAD provides a larger 241 scale of flexibility in the wake timers. The time capabilities of the 242 TAD maintain the time of day information across platform power 243 transitions, and keep track of time even when the platform is turned 244 off. 245 246config ACPI_DOCK 247 bool "Dock" 248 help 249 This driver supports ACPI-controlled docking stations and removable 250 drive bays such as the IBM Ultrabay and the Dell Module Bay. 251 252config ACPI_CPU_FREQ_PSS 253 bool 254 select THERMAL 255 256config ACPI_PROCESSOR_CSTATE 257 def_bool y 258 depends on ACPI_PROCESSOR 259 depends on IA64 || X86 260 261config ACPI_PROCESSOR_IDLE 262 bool 263 select CPU_IDLE 264 265config ACPI_MCFG 266 bool 267 268config ACPI_CPPC_LIB 269 bool 270 depends on ACPI_PROCESSOR 271 select MAILBOX 272 select PCC 273 help 274 If this option is enabled, this file implements common functionality 275 to parse CPPC tables as described in the ACPI 5.1+ spec. The 276 routines implemented are meant to be used by other 277 drivers to control CPU performance using CPPC semantics. 278 If your platform does not support CPPC in firmware, 279 leave this option disabled. 280 281config ACPI_PROCESSOR 282 tristate "Processor" 283 depends on X86 || IA64 || ARM64 || LOONGARCH 284 select ACPI_PROCESSOR_IDLE 285 select ACPI_CPU_FREQ_PSS if X86 || IA64 || LOONGARCH 286 default y 287 help 288 This driver adds support for the ACPI Processor package. It is required 289 by several flavors of cpufreq performance-state, thermal, throttling and 290 idle drivers. 291 292 To compile this driver as a module, choose M here: 293 the module will be called processor. 294 295config ACPI_IPMI 296 tristate "IPMI" 297 depends on IPMI_HANDLER 298 help 299 This driver enables the ACPI to access the BMC controller. And it 300 uses the IPMI request/response message to communicate with BMC 301 controller, which can be found on on the server. 302 303 To compile this driver as a module, choose M here: 304 the module will be called as acpi_ipmi. 305 306config ACPI_HOTPLUG_CPU 307 bool 308 depends on ACPI_PROCESSOR && HOTPLUG_CPU 309 select ACPI_CONTAINER 310 default y 311 312config ACPI_PROCESSOR_AGGREGATOR 313 tristate "Processor Aggregator" 314 depends on ACPI_PROCESSOR 315 depends on X86 316 help 317 ACPI 4.0 defines processor Aggregator, which enables OS to perform 318 specific processor configuration and control that applies to all 319 processors in the platform. Currently only logical processor idling 320 is defined, which is to reduce power consumption. This driver 321 supports the new device. 322 323config ACPI_THERMAL 324 tristate "Thermal Zone" 325 depends on ACPI_PROCESSOR 326 select THERMAL 327 default y 328 help 329 This driver supports ACPI thermal zones. Most mobile and 330 some desktop systems support ACPI thermal zones. It is HIGHLY 331 recommended that this option be enabled, as your processor(s) 332 may be damaged without it. 333 334 To compile this driver as a module, choose M here: 335 the module will be called thermal. 336 337config ACPI_PLATFORM_PROFILE 338 tristate 339 340config ACPI_CUSTOM_DSDT_FILE 341 string "Custom DSDT Table file to include" 342 default "" 343 depends on !STANDALONE 344 help 345 This option supports a custom DSDT by linking it into the kernel. 346 See Documentation/admin-guide/acpi/dsdt-override.rst 347 348 Enter the full path name to the file which includes the AmlCode 349 or dsdt_aml_code declaration. 350 351 If unsure, don't enter a file name. 352 353config ACPI_CUSTOM_DSDT 354 bool 355 default ACPI_CUSTOM_DSDT_FILE != "" 356 357config ARCH_HAS_ACPI_TABLE_UPGRADE 358 def_bool n 359 360config ACPI_TABLE_UPGRADE 361 bool "Allow upgrading ACPI tables via initrd" 362 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE 363 default y 364 help 365 This option provides functionality to upgrade arbitrary ACPI tables 366 via initrd. No functional change if no ACPI tables are passed via 367 initrd, therefore it's safe to say Y. 368 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 369 370config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD 371 bool "Override ACPI tables from built-in initrd" 372 depends on ACPI_TABLE_UPGRADE 373 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE 374 help 375 This option provides functionality to override arbitrary ACPI tables 376 from built-in uncompressed initrd. 377 378 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 379 380config ACPI_DEBUG 381 bool "Debug Statements" 382 help 383 The ACPI subsystem can produce debug output. Saying Y enables this 384 output and increases the kernel size by around 50K. 385 386 Use the acpi.debug_layer and acpi.debug_level kernel command-line 387 parameters documented in Documentation/firmware-guide/acpi/debug.rst and 388 Documentation/admin-guide/kernel-parameters.rst to control the type and 389 amount of debug output. 390 391config ACPI_PCI_SLOT 392 bool "PCI slot detection driver" 393 depends on SYSFS && PCI 394 help 395 This driver creates entries in /sys/bus/pci/slots/ for all PCI 396 slots in the system. This can help correlate PCI bus addresses, 397 i.e., segment/bus/device/function tuples, with physical slots in 398 the system. If you are unsure, say N. 399 400config ACPI_CONTAINER 401 bool "Container and Module Devices" 402 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) 403 help 404 This driver supports ACPI Container and Module devices (IDs 405 ACPI0004, PNP0A05, and PNP0A06). 406 407 This helps support hotplug of nodes, CPUs, and memory. 408 409config ACPI_HOTPLUG_MEMORY 410 bool "Memory Hotplug" 411 depends on MEMORY_HOTPLUG 412 help 413 This driver supports ACPI memory hotplug. The driver 414 fields notifications on ACPI memory devices (PNP0C80), 415 which represent memory ranges that may be onlined or 416 offlined during runtime. 417 418 If your hardware and firmware do not support adding or 419 removing memory devices at runtime, you need not enable 420 this driver. 421 422config ACPI_HOTPLUG_IOAPIC 423 bool 424 depends on PCI 425 depends on X86_IO_APIC 426 default y 427 428config ACPI_SBS 429 tristate "Smart Battery System" 430 depends on X86 431 select POWER_SUPPLY 432 help 433 This driver supports the Smart Battery System, another 434 type of access to battery information, found on some laptops. 435 436 To compile this driver as a module, choose M here: 437 the modules will be called sbs and sbshc. 438 439config ACPI_HED 440 tristate "Hardware Error Device" 441 help 442 This driver supports the Hardware Error Device (PNP0C33), 443 which is used to report some hardware errors notified via 444 SCI, mainly the corrected errors. 445 446config ACPI_CUSTOM_METHOD 447 tristate "Allow ACPI methods to be inserted/replaced at run time" 448 depends on DEBUG_FS 449 help 450 This debug facility allows ACPI AML methods to be inserted and/or 451 replaced without rebooting the system. For details refer to: 452 Documentation/firmware-guide/acpi/method-customizing.rst. 453 454 NOTE: This option is security sensitive, because it allows arbitrary 455 kernel memory to be written to by root (uid=0) users, allowing them 456 to bypass certain security measures (e.g. if root is not allowed to 457 load additional kernel modules after boot, this feature may be used 458 to override that restriction). 459 460config ACPI_BGRT 461 bool "Boottime Graphics Resource Table support" 462 depends on EFI && (X86 || ARM64) 463 help 464 This driver adds support for exposing the ACPI Boottime Graphics 465 Resource Table, which allows the operating system to obtain 466 data from the firmware boot splash. It will appear under 467 /sys/firmware/acpi/bgrt/ . 468 469config ACPI_REDUCED_HARDWARE_ONLY 470 bool "Hardware-reduced ACPI support only" if EXPERT 471 def_bool n 472 help 473 This config item changes the way the ACPI code is built. When this 474 option is selected, the kernel will use a specialized version of 475 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The 476 resulting kernel will be smaller but it will also be restricted to 477 running in ACPI reduced hardware mode ONLY. 478 479 If you are unsure what to do, do not enable this option. 480 481source "drivers/acpi/nfit/Kconfig" 482source "drivers/acpi/numa/Kconfig" 483source "drivers/acpi/apei/Kconfig" 484source "drivers/acpi/dptf/Kconfig" 485 486config ACPI_WATCHDOG 487 bool 488 489config ACPI_EXTLOG 490 tristate "Extended Error Log support" 491 depends on X86_MCE && X86_LOCAL_APIC && EDAC 492 select UEFI_CPER 493 help 494 Certain usages such as Predictive Failure Analysis (PFA) require 495 more information about the error than what can be described in 496 processor machine check banks. Most server processors log 497 additional information about the error in processor uncore 498 registers. Since the addresses and layout of these registers vary 499 widely from one processor to another, system software cannot 500 readily make use of them. To complicate matters further, some of 501 the additional error information cannot be constructed without 502 detailed knowledge about platform topology. 503 504 Enhanced MCA Logging allows firmware to provide additional error 505 information to system software, synchronous with MCE or CMCI. This 506 driver adds support for that functionality with corresponding 507 tracepoint which carries that information to userspace. 508 509config ACPI_ADXL 510 bool 511 512config ACPI_CONFIGFS 513 tristate "ACPI configfs support" 514 select CONFIGFS_FS 515 help 516 Select this option to enable support for ACPI configuration from 517 userspace. The configurable ACPI groups will be visible under 518 /config/acpi, assuming configfs is mounted under /config. 519 520if ARM64 521source "drivers/acpi/arm64/Kconfig" 522 523config ACPI_PPTT 524 bool 525endif 526 527source "drivers/acpi/pmic/Kconfig" 528 529config ACPI_VIOT 530 bool 531 532endif # ACPI 533 534config X86_PM_TIMER 535 bool "Power Management Timer Support" if EXPERT 536 depends on X86 && (ACPI || JAILHOUSE_GUEST) 537 default y 538 help 539 The Power Management Timer is available on all ACPI-capable, 540 in most cases even if ACPI is unusable or blacklisted. 541 542 This timing source is not affected by power management features 543 like aggressive processor idling, throttling, frequency and/or 544 voltage scaling, unlike the commonly used Time Stamp Counter 545 (TSC) timing source. 546 547 You should nearly always say Y here because many modern 548 systems require this timer. 549 550config ACPI_PRMT 551 bool "Platform Runtime Mechanism Support" 552 depends on EFI && X86_64 553 default y 554 help 555 Platform Runtime Mechanism (PRM) is a firmware interface exposing a 556 set of binary executables that can be called from the AML interpreter 557 or directly from device drivers. 558 559 Say Y to enable the AML interpreter to execute the PRM code. 560 561 While this feature is optional in principle, leaving it out may 562 substantially increase computational overhead related to the 563 initialization of some server systems. 564