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 select CRC32 15 select FIRMWARE_TABLE 16 default y if X86 17 help 18 Advanced Configuration and Power Interface (ACPI) support for 19 Linux requires an ACPI-compliant platform (hardware/firmware), 20 and assumes the presence of OS-directed configuration and power 21 management (OSPM) software. This option will enlarge your 22 kernel by about 70K. 23 24 Linux ACPI provides a robust functional replacement for several 25 legacy configuration and power management interfaces, including 26 the Plug-and-Play BIOS specification (PnP BIOS), the 27 MultiProcessor Specification (MPS), and the Advanced Power 28 Management (APM) specification. If both ACPI and APM support 29 are configured, ACPI is used. 30 31 Linux support for ACPI is based on Intel Corporation's ACPI 32 Component Architecture (ACPI CA). For more information on the 33 ACPI CA, see: 34 <https://acpica.org/> 35 36 ACPI is an open industry specification originally co-developed by 37 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently, 38 it is developed by the ACPI Specification Working Group (ASWG) under 39 the UEFI Forum and any UEFI member can join the ASWG and contribute 40 to the ACPI specification. 41 The specification is available at: 42 <https://uefi.org/specifications> 43 44if ACPI 45 46config ACPI_LEGACY_TABLES_LOOKUP 47 bool 48 49config ARCH_MIGHT_HAVE_ACPI_PDC 50 bool 51 52config ACPI_GENERIC_GSI 53 bool 54 55config ACPI_SYSTEM_POWER_STATES_SUPPORT 56 bool 57 58config ACPI_CCA_REQUIRED 59 bool 60 61config ACPI_TABLE_LIB 62 bool 63 64config ACPI_THERMAL_LIB 65 depends on THERMAL 66 bool 67 68config ACPI_DEBUGGER 69 bool "AML debugger interface" 70 select ACPI_DEBUG 71 help 72 Enable in-kernel debugging of AML facilities: statistics, 73 internal object dump, single step control method execution. 74 This is still under development, currently enabling this only 75 results in the compilation of the ACPICA debugger files. 76 77if ACPI_DEBUGGER 78 79config ACPI_DEBUGGER_USER 80 tristate "Userspace debugger accessibility" 81 depends on DEBUG_FS 82 help 83 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities 84 to access the debugger functionalities. 85 86endif 87 88config ACPI_SPCR_TABLE 89 bool "ACPI Serial Port Console Redirection Support" 90 default y if X86 91 help 92 Enable support for Serial Port Console Redirection (SPCR) Table. 93 This table provides information about the configuration of the 94 earlycon console. 95 96config ACPI_FPDT 97 bool "ACPI Firmware Performance Data Table (FPDT) support" 98 depends on X86_64 || ARM64 99 help 100 Enable support for the Firmware Performance Data Table (FPDT). 101 This table provides information on the timing of the system 102 boot, S3 suspend and S3 resume firmware code paths. 103 104config ACPI_LPIT 105 bool 106 depends on X86_64 107 default y 108 109config ACPI_SLEEP 110 bool 111 depends on SUSPEND || HIBERNATION 112 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT 113 default y 114 115config ACPI_REV_OVERRIDE_POSSIBLE 116 bool "Allow supported ACPI revision to be overridden" 117 depends on X86 118 default y 119 help 120 The platform firmware on some systems expects Linux to return "5" as 121 the supported ACPI revision which makes it expose system configuration 122 information in a special way. 123 124 For example, based on what ACPI exports as the supported revision, 125 Dell XPS 13 (2015) configures its audio device to either work in HDA 126 mode or in I2S mode, where the former is supposed to be used on Linux 127 until the latter is fully supported (in the kernel as well as in user 128 space). 129 130 This option enables a DMI-based quirk for the above Dell machine (so 131 that HDA audio is exposed by the platform firmware to the kernel) and 132 makes it possible to force the kernel to return "5" as the supported 133 ACPI revision via the "acpi_rev_override" command line switch. 134 135config ACPI_EC 136 bool "Embedded Controller" 137 depends on HAS_IOPORT 138 default X86 139 help 140 This driver handles communication with the microcontroller 141 on many x86 laptops and other machines. 142 143config ACPI_EC_DEBUGFS 144 tristate "EC read/write access through /sys/kernel/debug/ec" 145 depends on ACPI_EC 146 help 147 Say N to disable Embedded Controller /sys/kernel/debug interface 148 149 Be aware that using this interface can confuse your Embedded 150 Controller in a way that a normal reboot is not enough. You then 151 have to power off your system, and remove the laptop battery for 152 some seconds. 153 An Embedded Controller typically is available on laptops and reads 154 sensor values like battery state and temperature. 155 The kernel accesses the EC through ACPI parsed code provided by BIOS 156 tables. This option allows to access the EC directly without ACPI 157 code being involved. 158 Thus this option is a debug option that helps to write ACPI drivers 159 and can be used to identify ACPI code or EC firmware bugs. 160 161config ACPI_AC 162 tristate "AC Adapter" 163 select POWER_SUPPLY 164 default y 165 help 166 This driver supports the AC Adapter object, which indicates 167 whether a system is on AC or not. If you have a system that can 168 switch between A/C and battery, say Y. 169 170 To compile this driver as a module, choose M here: 171 the module will be called ac. 172 173config ACPI_BATTERY 174 tristate "Battery" 175 select POWER_SUPPLY 176 default y 177 help 178 This driver adds support for battery information through 179 /proc/acpi/battery. If you have a mobile system with a battery, 180 say Y. 181 182 To compile this driver as a module, choose M here: 183 the module will be called battery. 184 185config ACPI_BUTTON 186 tristate "Button" 187 depends on INPUT 188 default y 189 help 190 This driver handles events on the power, sleep, and lid buttons. 191 A daemon reads events from input devices or via netlink and 192 performs user-defined actions such as shutting down the system. 193 This is necessary for software-controlled poweroff. 194 195 To compile this driver as a module, choose M here: 196 the module will be called button. 197 198config ACPI_TINY_POWER_BUTTON 199 tristate "Tiny Power Button Driver" 200 depends on !ACPI_BUTTON 201 help 202 This driver provides a tiny alternative to the ACPI Button driver. 203 The tiny power button driver only handles the power button. Rather 204 than notifying userspace via the input layer or a netlink event, this 205 driver directly signals the init process to shut down. 206 207 This driver is particularly suitable for cloud and VM environments, 208 which use a simulated power button to initiate a controlled poweroff, 209 but which may not want to run a separate userspace daemon to process 210 input events. 211 212config ACPI_TINY_POWER_BUTTON_SIGNAL 213 int "Tiny Power Button Signal" 214 depends on ACPI_TINY_POWER_BUTTON 215 default 38 216 help 217 Default signal to send to init in response to the power button. 218 219 Likely values here include 38 (SIGRTMIN+4) to power off, or 2 220 (SIGINT) to simulate Ctrl+Alt+Del. 221 222config ACPI_VIDEO 223 tristate "Video" 224 depends on BACKLIGHT_CLASS_DEVICE 225 depends on INPUT 226 depends on ACPI_WMI || !X86 227 select THERMAL 228 help 229 This driver implements the ACPI Extensions For Display Adapters 230 for integrated graphics devices on motherboard, as specified in 231 ACPI 2.0 Specification, Appendix B. This supports basic operations 232 such as defining the video POST device, retrieving EDID information, 233 and setting up a video output. 234 235 To compile this driver as a module, choose M here: 236 the module will be called video. 237 238config ACPI_FAN 239 tristate "Fan" 240 depends on THERMAL 241 default y 242 help 243 This driver supports ACPI fan devices, allowing user-mode 244 applications to perform basic fan control (on, off, status). 245 246 To compile this driver as a module, choose M here: 247 the module will be called fan. 248 249config ACPI_TAD 250 tristate "ACPI Time and Alarm (TAD) Device Support" 251 depends on SYSFS && PM_SLEEP 252 help 253 The ACPI Time and Alarm (TAD) device is an alternative to the Real 254 Time Clock (RTC). Its wake timers allow the system to transition from 255 the S3 (or optionally S4/S5) state to S0 state after a time period 256 elapses. In comparison with the RTC Alarm, the TAD provides a larger 257 scale of flexibility in the wake timers. The time capabilities of the 258 TAD maintain the time of day information across platform power 259 transitions, and keep track of time even when the platform is turned 260 off. 261 262config ACPI_DOCK 263 bool "Dock" 264 help 265 This driver supports ACPI-controlled docking stations and removable 266 drive bays such as the IBM Ultrabay and the Dell Module Bay. 267 268config ACPI_CPU_FREQ_PSS 269 bool 270 271config ACPI_PROCESSOR_CSTATE 272 def_bool y 273 depends on ACPI_PROCESSOR 274 depends on X86 275 276config ACPI_PROCESSOR_IDLE 277 bool 278 select CPU_IDLE 279 280config ACPI_MCFG 281 bool 282 283config ACPI_CPPC_LIB 284 bool 285 depends on ACPI_PROCESSOR 286 select MAILBOX 287 select PCC 288 help 289 If this option is enabled, this file implements common functionality 290 to parse CPPC tables as described in the ACPI 5.1+ spec. The 291 routines implemented are meant to be used by other 292 drivers to control CPU performance using CPPC semantics. 293 If your platform does not support CPPC in firmware, 294 leave this option disabled. 295 296config ACPI_PROCESSOR 297 tristate "Processor" 298 depends on X86 || ARM64 || LOONGARCH || RISCV 299 select ACPI_PROCESSOR_IDLE 300 select ACPI_CPU_FREQ_PSS if X86 || LOONGARCH 301 select THERMAL 302 default y 303 help 304 This driver adds support for the ACPI Processor package. It is required 305 by several flavors of cpufreq performance-state, thermal, throttling and 306 idle drivers. 307 308 To compile this driver as a module, choose M here: 309 the module will be called processor. 310 311config ACPI_IPMI 312 tristate "IPMI" 313 depends on IPMI_HANDLER 314 help 315 This driver enables the ACPI to access the BMC controller. And it 316 uses the IPMI request/response message to communicate with BMC 317 controller, which can be found on the server. 318 319 To compile this driver as a module, choose M here: 320 the module will be called as acpi_ipmi. 321 322config ACPI_HOTPLUG_CPU 323 bool 324 depends on ACPI_PROCESSOR && HOTPLUG_CPU 325 select ACPI_CONTAINER 326 327config ACPI_PROCESSOR_AGGREGATOR 328 tristate "Processor Aggregator" 329 depends on ACPI_PROCESSOR 330 depends on X86 331 help 332 ACPI 4.0 defines processor Aggregator, which enables OS to perform 333 specific processor configuration and control that applies to all 334 processors in the platform. Currently only logical processor idling 335 is defined, which is to reduce power consumption. This driver 336 supports the new device. 337 338config ACPI_THERMAL 339 tristate "Thermal Zone" 340 depends on ACPI_PROCESSOR 341 select THERMAL 342 select ACPI_THERMAL_LIB 343 default y 344 help 345 This driver supports ACPI thermal zones. Most mobile and 346 some desktop systems support ACPI thermal zones. It is HIGHLY 347 recommended that this option be enabled, as your processor(s) 348 may be damaged without it. 349 350 To compile this driver as a module, choose M here: 351 the module will be called thermal. 352 353config ACPI_PLATFORM_PROFILE 354 tristate 355 356config ACPI_CUSTOM_DSDT_FILE 357 string "Custom DSDT Table file to include" 358 default "" 359 depends on !STANDALONE 360 help 361 This option supports a custom DSDT by linking it into the kernel. 362 363 Enter the full path name to the file which includes the AmlCode 364 or dsdt_aml_code declaration. 365 366 If unsure, don't enter a file name. 367 368config ACPI_CUSTOM_DSDT 369 bool 370 default ACPI_CUSTOM_DSDT_FILE != "" 371 372config ARCH_HAS_ACPI_TABLE_UPGRADE 373 def_bool n 374 375config ACPI_TABLE_UPGRADE 376 bool "Allow upgrading ACPI tables via initrd" 377 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE 378 default y 379 help 380 This option provides functionality to upgrade arbitrary ACPI tables 381 via initrd. No functional change if no ACPI tables are passed via 382 initrd, therefore it's safe to say Y. 383 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 384 385config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD 386 bool "Override ACPI tables from built-in initrd" 387 depends on ACPI_TABLE_UPGRADE 388 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE 389 help 390 This option provides functionality to override arbitrary ACPI tables 391 from built-in uncompressed initrd. 392 393 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 394 395config ACPI_DEBUG 396 bool "Debug Statements" 397 help 398 The ACPI subsystem can produce debug output. Saying Y enables this 399 output and increases the kernel size by around 50K. 400 401 Use the acpi.debug_layer and acpi.debug_level kernel command-line 402 parameters documented in Documentation/firmware-guide/acpi/debug.rst and 403 Documentation/admin-guide/kernel-parameters.rst to control the type and 404 amount of debug output. 405 406config ACPI_PCI_SLOT 407 bool "PCI slot detection driver" 408 depends on SYSFS && PCI 409 help 410 This driver creates entries in /sys/bus/pci/slots/ for all PCI 411 slots in the system. This can help correlate PCI bus addresses, 412 i.e., segment/bus/device/function tuples, with physical slots in 413 the system. If you are unsure, say N. 414 415config ACPI_CONTAINER 416 bool "Container and Module Devices" 417 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) 418 help 419 This driver supports ACPI Container and Module devices (IDs 420 ACPI0004, PNP0A05, and PNP0A06). 421 422 This helps support hotplug of nodes, CPUs, and memory. 423 424config ACPI_HOTPLUG_MEMORY 425 bool "Memory Hotplug" 426 depends on MEMORY_HOTPLUG 427 help 428 This driver supports ACPI memory hotplug. The driver 429 fields notifications on ACPI memory devices (PNP0C80), 430 which represent memory ranges that may be onlined or 431 offlined during runtime. 432 433 If your hardware and firmware do not support adding or 434 removing memory devices at runtime, you need not enable 435 this driver. 436 437config ACPI_HOTPLUG_IOAPIC 438 bool 439 depends on PCI 440 depends on X86_IO_APIC 441 default y 442 443config ACPI_SBS 444 tristate "Smart Battery System" 445 depends on X86 && ACPI_EC 446 select POWER_SUPPLY 447 help 448 This driver supports the Smart Battery System, another 449 type of access to battery information, found on some laptops. 450 451 To compile this driver as a module, choose M here: 452 the modules will be called sbs and sbshc. 453 454config ACPI_HED 455 tristate "Hardware Error Device" 456 help 457 This driver supports the Hardware Error Device (PNP0C33), 458 which is used to report some hardware errors notified via 459 SCI, mainly the corrected errors. 460 461config ACPI_BGRT 462 bool "Boottime Graphics Resource Table support" 463 depends on EFI && (X86 || ARM64 || LOONGARCH) 464 help 465 This driver adds support for exposing the ACPI Boottime Graphics 466 Resource Table, which allows the operating system to obtain 467 data from the firmware boot splash. It will appear under 468 /sys/firmware/acpi/bgrt/ . 469 470config ACPI_REDUCED_HARDWARE_ONLY 471 bool "Hardware-reduced ACPI support only" if EXPERT 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 481config ACPI_NHLT 482 bool 483 484source "drivers/acpi/nfit/Kconfig" 485source "drivers/acpi/numa/Kconfig" 486source "drivers/acpi/apei/Kconfig" 487source "drivers/acpi/dptf/Kconfig" 488 489config ACPI_WATCHDOG 490 bool 491 492config ACPI_EXTLOG 493 tristate "Extended Error Log support" 494 depends on X86_MCE && X86_LOCAL_APIC && EDAC 495 select UEFI_CPER 496 help 497 Certain usages such as Predictive Failure Analysis (PFA) require 498 more information about the error than what can be described in 499 processor machine check banks. Most server processors log 500 additional information about the error in processor uncore 501 registers. Since the addresses and layout of these registers vary 502 widely from one processor to another, system software cannot 503 readily make use of them. To complicate matters further, some of 504 the additional error information cannot be constructed without 505 detailed knowledge about platform topology. 506 507 Enhanced MCA Logging allows firmware to provide additional error 508 information to system software, synchronous with MCE or CMCI. This 509 driver adds support for that functionality with corresponding 510 tracepoint which carries that information to userspace. 511 512config ACPI_ADXL 513 bool 514 515config ACPI_CONFIGFS 516 tristate "ACPI configfs support" 517 select CONFIGFS_FS 518 help 519 Select this option to enable support for ACPI configuration from 520 userspace. The configurable ACPI groups will be visible under 521 /config/acpi, assuming configfs is mounted under /config. 522 523config ACPI_PFRUT 524 tristate "ACPI Platform Firmware Runtime Update and Telemetry" 525 depends on 64BIT 526 help 527 This mechanism allows certain pieces of the platform firmware 528 to be updated on the fly while the system is running (runtime) 529 without the need to restart it, which is key in the cases when 530 the system needs to be available 100% of the time and it cannot 531 afford the downtime related to restarting it, or when the work 532 carried out by the system is particularly important, so it cannot 533 be interrupted, and it is not practical to wait until it is complete. 534 535 The existing firmware code can be modified (driver update) or 536 extended by adding new code to the firmware (code injection). 537 538 Besides, the telemetry driver allows user space to fetch telemetry 539 data from the firmware with the help of the Platform Firmware Runtime 540 Telemetry interface. 541 542 To compile the drivers as modules, choose M here: 543 the modules will be called pfr_update and pfr_telemetry. 544 545if ARM64 546source "drivers/acpi/arm64/Kconfig" 547endif 548 549config ACPI_PPTT 550 bool 551 552config ACPI_PCC 553 bool "ACPI PCC Address Space" 554 depends on PCC 555 default y 556 help 557 The PCC Address Space also referred as PCC Operation Region pertains 558 to the region of PCC subspace that succeeds the PCC signature. 559 560 The PCC Operation Region works in conjunction with the PCC Table 561 (Platform Communications Channel Table). PCC subspaces that are 562 marked for use as PCC Operation Regions must not be used as PCC 563 subspaces for the standard ACPI features such as CPPC, RASF, PDTT and 564 MPST. These standard features must always use the PCC Table instead. 565 566 Enable this feature if you want to set up and install the PCC Address 567 Space handler to handle PCC OpRegion in the firmware. 568 569config ACPI_FFH 570 bool "ACPI FFH Address Space" 571 default n 572 help 573 The FFH(Fixed Function Hardware) Address Space also referred as FFH 574 Operation Region allows to define platform specific opregion. 575 576 Enable this feature if you want to set up and install the FFH Address 577 Space handler to handle FFH OpRegion in the firmware. 578 579source "drivers/acpi/pmic/Kconfig" 580 581config ACPI_VIOT 582 bool 583 584config ACPI_PRMT 585 bool "Platform Runtime Mechanism Support" 586 depends on EFI_RUNTIME_WRAPPERS && (X86_64 || ARM64) 587 default y 588 help 589 Platform Runtime Mechanism (PRM) is a firmware interface exposing a 590 set of binary executables that can be called from the AML interpreter 591 or directly from device drivers. 592 593 Say Y to enable the AML interpreter to execute the PRM code. 594 595 While this feature is optional in principle, leaving it out may 596 substantially increase computational overhead related to the 597 initialization of some server systems. 598 599endif # ACPI 600 601config X86_PM_TIMER 602 bool "Power Management Timer Support" if EXPERT 603 depends on X86 && (ACPI || JAILHOUSE_GUEST) 604 default y 605 help 606 The Power Management Timer is available on all ACPI-capable, 607 in most cases even if ACPI is unusable or blacklisted. 608 609 This timing source is not affected by power management features 610 like aggressive processor idling, throttling, frequency and/or 611 voltage scaling, unlike the commonly used Time Stamp Counter 612 (TSC) timing source. 613 614 You should nearly always say Y here because many modern 615 systems require this timer. 616