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 default y if X86 16 help 17 Advanced Configuration and Power Interface (ACPI) support for 18 Linux requires an ACPI-compliant platform (hardware/firmware), 19 and assumes the presence of OS-directed configuration and power 20 management (OSPM) software. This option will enlarge your 21 kernel by about 70K. 22 23 Linux ACPI provides a robust functional replacement for several 24 legacy configuration and power management interfaces, including 25 the Plug-and-Play BIOS specification (PnP BIOS), the 26 MultiProcessor Specification (MPS), and the Advanced Power 27 Management (APM) specification. If both ACPI and APM support 28 are configured, ACPI is used. 29 30 The project home page for the Linux ACPI subsystem is here: 31 <https://01.org/linux-acpi> 32 33 Linux support for ACPI is based on Intel Corporation's ACPI 34 Component Architecture (ACPI CA). For more information on the 35 ACPI CA, see: 36 <https://acpica.org/> 37 38 ACPI is an open industry specification originally co-developed by 39 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently, 40 it is developed by the ACPI Specification Working Group (ASWG) under 41 the UEFI Forum and any UEFI member can join the ASWG and contribute 42 to the ACPI specification. 43 The specification is available at: 44 <https://uefi.org/specifications> 45 46if ACPI 47 48config ACPI_LEGACY_TABLES_LOOKUP 49 bool 50 51config ARCH_MIGHT_HAVE_ACPI_PDC 52 bool 53 54config ACPI_GENERIC_GSI 55 bool 56 57config ACPI_SYSTEM_POWER_STATES_SUPPORT 58 bool 59 60config ACPI_CCA_REQUIRED 61 bool 62 63config ACPI_TABLE_LIB 64 bool 65 66config ACPI_DEBUGGER 67 bool "AML debugger interface" 68 select ACPI_DEBUG 69 help 70 Enable in-kernel debugging of AML facilities: statistics, 71 internal object dump, single step control method execution. 72 This is still under development, currently enabling this only 73 results in the compilation of the ACPICA debugger files. 74 75if ACPI_DEBUGGER 76 77config ACPI_DEBUGGER_USER 78 tristate "Userspace debugger accessibility" 79 depends on DEBUG_FS 80 help 81 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities 82 to access the debugger functionalities. 83 84endif 85 86config ACPI_SPCR_TABLE 87 bool "ACPI Serial Port Console Redirection Support" 88 default y if X86 89 help 90 Enable support for Serial Port Console Redirection (SPCR) Table. 91 This table provides information about the configuration of the 92 earlycon console. 93 94config ACPI_FPDT 95 bool "ACPI Firmware Performance Data Table (FPDT) support" 96 depends on X86_64 97 help 98 Enable support for the Firmware Performance Data Table (FPDT). 99 This table provides information on the timing of the system 100 boot, S3 suspend and S3 resume firmware code paths. 101 102config ACPI_LPIT 103 bool 104 depends on X86_64 105 default y 106 107config ACPI_SLEEP 108 bool 109 depends on SUSPEND || HIBERNATION 110 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT 111 default y 112 113config ACPI_REV_OVERRIDE_POSSIBLE 114 bool "Allow supported ACPI revision to be overridden" 115 depends on X86 116 default y 117 help 118 The platform firmware on some systems expects Linux to return "5" as 119 the supported ACPI revision which makes it expose system configuration 120 information in a special way. 121 122 For example, based on what ACPI exports as the supported revision, 123 Dell XPS 13 (2015) configures its audio device to either work in HDA 124 mode or in I2S mode, where the former is supposed to be used on Linux 125 until the latter is fully supported (in the kernel as well as in user 126 space). 127 128 This option enables a DMI-based quirk for the above Dell machine (so 129 that HDA audio is exposed by the platform firmware to the kernel) and 130 makes it possible to force the kernel to return "5" as the supported 131 ACPI revision via the "acpi_rev_override" command line switch. 132 133config ACPI_EC_DEBUGFS 134 tristate "EC read/write access through /sys/kernel/debug/ec" 135 help 136 Say N to disable Embedded Controller /sys/kernel/debug interface 137 138 Be aware that using this interface can confuse your Embedded 139 Controller in a way that a normal reboot is not enough. You then 140 have to power off your system, and remove the laptop battery for 141 some seconds. 142 An Embedded Controller typically is available on laptops and reads 143 sensor values like battery state and temperature. 144 The kernel accesses the EC through ACPI parsed code provided by BIOS 145 tables. This option allows to access the EC directly without ACPI 146 code being involved. 147 Thus this option is a debug option that helps to write ACPI drivers 148 and can be used to identify ACPI code or EC firmware bugs. 149 150config ACPI_AC 151 tristate "AC Adapter" 152 select POWER_SUPPLY 153 default y 154 help 155 This driver supports the AC Adapter object, which indicates 156 whether a system is on AC or not. If you have a system that can 157 switch between A/C and battery, say Y. 158 159 To compile this driver as a module, choose M here: 160 the module will be called ac. 161 162config ACPI_BATTERY 163 tristate "Battery" 164 select POWER_SUPPLY 165 default y 166 help 167 This driver adds support for battery information through 168 /proc/acpi/battery. If you have a mobile system with a battery, 169 say Y. 170 171 To compile this driver as a module, choose M here: 172 the module will be called battery. 173 174config ACPI_BUTTON 175 tristate "Button" 176 depends on INPUT 177 default y 178 help 179 This driver handles events on the power, sleep, and lid buttons. 180 A daemon reads events from input devices or via netlink and 181 performs user-defined actions such as shutting down the system. 182 This is necessary for software-controlled poweroff. 183 184 To compile this driver as a module, choose M here: 185 the module will be called button. 186 187config ACPI_TINY_POWER_BUTTON 188 tristate "Tiny Power Button Driver" 189 depends on !ACPI_BUTTON 190 help 191 This driver provides a tiny alternative to the ACPI Button driver. 192 The tiny power button driver only handles the power button. Rather 193 than notifying userspace via the input layer or a netlink event, this 194 driver directly signals the init process to shut down. 195 196 This driver is particularly suitable for cloud and VM environments, 197 which use a simulated power button to initiate a controlled poweroff, 198 but which may not want to run a separate userspace daemon to process 199 input events. 200 201config ACPI_TINY_POWER_BUTTON_SIGNAL 202 int "Tiny Power Button Signal" 203 depends on ACPI_TINY_POWER_BUTTON 204 default 38 205 help 206 Default signal to send to init in response to the power button. 207 208 Likely values here include 38 (SIGRTMIN+4) to power off, or 2 209 (SIGINT) to simulate Ctrl+Alt+Del. 210 211config ACPI_VIDEO 212 tristate "Video" 213 depends on BACKLIGHT_CLASS_DEVICE 214 depends on INPUT 215 select THERMAL 216 help 217 This driver implements the ACPI Extensions For Display Adapters 218 for integrated graphics devices on motherboard, as specified in 219 ACPI 2.0 Specification, Appendix B. This supports basic operations 220 such as defining the video POST device, retrieving EDID information, 221 and setting up a video output. 222 223 To compile this driver as a module, choose M here: 224 the module will be called video. 225 226config ACPI_FAN 227 tristate "Fan" 228 depends on THERMAL 229 default y 230 help 231 This driver supports ACPI fan devices, allowing user-mode 232 applications to perform basic fan control (on, off, status). 233 234 To compile this driver as a module, choose M here: 235 the module will be called fan. 236 237config ACPI_TAD 238 tristate "ACPI Time and Alarm (TAD) Device Support" 239 depends on SYSFS && PM_SLEEP 240 help 241 The ACPI Time and Alarm (TAD) device is an alternative to the Real 242 Time Clock (RTC). Its wake timers allow the system to transition from 243 the S3 (or optionally S4/S5) state to S0 state after a time period 244 elapses. In comparison with the RTC Alarm, the TAD provides a larger 245 scale of flexibility in the wake timers. The time capabilities of the 246 TAD maintain the time of day information across platform power 247 transitions, and keep track of time even when the platform is turned 248 off. 249 250config ACPI_DOCK 251 bool "Dock" 252 help 253 This driver supports ACPI-controlled docking stations and removable 254 drive bays such as the IBM Ultrabay and the Dell Module Bay. 255 256config ACPI_CPU_FREQ_PSS 257 bool 258 259config ACPI_PROCESSOR_CSTATE 260 def_bool y 261 depends on ACPI_PROCESSOR 262 depends on IA64 || X86 263 264config ACPI_PROCESSOR_IDLE 265 bool 266 select CPU_IDLE 267 268config ACPI_MCFG 269 bool 270 271config ACPI_CPPC_LIB 272 bool 273 depends on ACPI_PROCESSOR 274 select MAILBOX 275 select PCC 276 help 277 If this option is enabled, this file implements common functionality 278 to parse CPPC tables as described in the ACPI 5.1+ spec. The 279 routines implemented are meant to be used by other 280 drivers to control CPU performance using CPPC semantics. 281 If your platform does not support CPPC in firmware, 282 leave this option disabled. 283 284config ACPI_PROCESSOR 285 tristate "Processor" 286 depends on X86 || IA64 || ARM64 || LOONGARCH 287 select ACPI_PROCESSOR_IDLE 288 select ACPI_CPU_FREQ_PSS if X86 || IA64 || LOONGARCH 289 select THERMAL 290 default y 291 help 292 This driver adds support for the ACPI Processor package. It is required 293 by several flavors of cpufreq performance-state, thermal, throttling and 294 idle drivers. 295 296 To compile this driver as a module, choose M here: 297 the module will be called processor. 298 299config ACPI_IPMI 300 tristate "IPMI" 301 depends on IPMI_HANDLER 302 help 303 This driver enables the ACPI to access the BMC controller. And it 304 uses the IPMI request/response message to communicate with BMC 305 controller, which can be found on the server. 306 307 To compile this driver as a module, choose M here: 308 the module will be called as acpi_ipmi. 309 310config ACPI_HOTPLUG_CPU 311 bool 312 depends on ACPI_PROCESSOR && HOTPLUG_CPU 313 select ACPI_CONTAINER 314 default y 315 316config ACPI_PROCESSOR_AGGREGATOR 317 tristate "Processor Aggregator" 318 depends on ACPI_PROCESSOR 319 depends on X86 320 help 321 ACPI 4.0 defines processor Aggregator, which enables OS to perform 322 specific processor configuration and control that applies to all 323 processors in the platform. Currently only logical processor idling 324 is defined, which is to reduce power consumption. This driver 325 supports the new device. 326 327config ACPI_THERMAL 328 tristate "Thermal Zone" 329 depends on ACPI_PROCESSOR 330 select THERMAL 331 default y 332 help 333 This driver supports ACPI thermal zones. Most mobile and 334 some desktop systems support ACPI thermal zones. It is HIGHLY 335 recommended that this option be enabled, as your processor(s) 336 may be damaged without it. 337 338 To compile this driver as a module, choose M here: 339 the module will be called thermal. 340 341config ACPI_PLATFORM_PROFILE 342 tristate 343 344config ACPI_CUSTOM_DSDT_FILE 345 string "Custom DSDT Table file to include" 346 default "" 347 depends on !STANDALONE 348 help 349 This option supports a custom DSDT by linking it into the kernel. 350 See Documentation/admin-guide/acpi/dsdt-override.rst 351 352 Enter the full path name to the file which includes the AmlCode 353 or dsdt_aml_code declaration. 354 355 If unsure, don't enter a file name. 356 357config ACPI_CUSTOM_DSDT 358 bool 359 default ACPI_CUSTOM_DSDT_FILE != "" 360 361config ARCH_HAS_ACPI_TABLE_UPGRADE 362 def_bool n 363 364config ACPI_TABLE_UPGRADE 365 bool "Allow upgrading ACPI tables via initrd" 366 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE 367 default y 368 help 369 This option provides functionality to upgrade arbitrary ACPI tables 370 via initrd. No functional change if no ACPI tables are passed via 371 initrd, therefore it's safe to say Y. 372 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 373 374config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD 375 bool "Override ACPI tables from built-in initrd" 376 depends on ACPI_TABLE_UPGRADE 377 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE 378 help 379 This option provides functionality to override arbitrary ACPI tables 380 from built-in uncompressed initrd. 381 382 See Documentation/admin-guide/acpi/initrd_table_override.rst for details 383 384config ACPI_DEBUG 385 bool "Debug Statements" 386 help 387 The ACPI subsystem can produce debug output. Saying Y enables this 388 output and increases the kernel size by around 50K. 389 390 Use the acpi.debug_layer and acpi.debug_level kernel command-line 391 parameters documented in Documentation/firmware-guide/acpi/debug.rst and 392 Documentation/admin-guide/kernel-parameters.rst to control the type and 393 amount of debug output. 394 395config ACPI_PCI_SLOT 396 bool "PCI slot detection driver" 397 depends on SYSFS && PCI 398 help 399 This driver creates entries in /sys/bus/pci/slots/ for all PCI 400 slots in the system. This can help correlate PCI bus addresses, 401 i.e., segment/bus/device/function tuples, with physical slots in 402 the system. If you are unsure, say N. 403 404config ACPI_CONTAINER 405 bool "Container and Module Devices" 406 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) 407 help 408 This driver supports ACPI Container and Module devices (IDs 409 ACPI0004, PNP0A05, and PNP0A06). 410 411 This helps support hotplug of nodes, CPUs, and memory. 412 413config ACPI_HOTPLUG_MEMORY 414 bool "Memory Hotplug" 415 depends on MEMORY_HOTPLUG 416 help 417 This driver supports ACPI memory hotplug. The driver 418 fields notifications on ACPI memory devices (PNP0C80), 419 which represent memory ranges that may be onlined or 420 offlined during runtime. 421 422 If your hardware and firmware do not support adding or 423 removing memory devices at runtime, you need not enable 424 this driver. 425 426config ACPI_HOTPLUG_IOAPIC 427 bool 428 depends on PCI 429 depends on X86_IO_APIC 430 default y 431 432config ACPI_SBS 433 tristate "Smart Battery System" 434 depends on X86 435 select POWER_SUPPLY 436 help 437 This driver supports the Smart Battery System, another 438 type of access to battery information, found on some laptops. 439 440 To compile this driver as a module, choose M here: 441 the modules will be called sbs and sbshc. 442 443config ACPI_HED 444 tristate "Hardware Error Device" 445 help 446 This driver supports the Hardware Error Device (PNP0C33), 447 which is used to report some hardware errors notified via 448 SCI, mainly the corrected errors. 449 450config ACPI_CUSTOM_METHOD 451 tristate "Allow ACPI methods to be inserted/replaced at run time" 452 depends on DEBUG_FS 453 help 454 This debug facility allows ACPI AML methods to be inserted and/or 455 replaced without rebooting the system. For details refer to: 456 Documentation/firmware-guide/acpi/method-customizing.rst. 457 458 NOTE: This option is security sensitive, because it allows arbitrary 459 kernel memory to be written to by root (uid=0) users, allowing them 460 to bypass certain security measures (e.g. if root is not allowed to 461 load additional kernel modules after boot, this feature may be used 462 to override that restriction). 463 464config ACPI_BGRT 465 bool "Boottime Graphics Resource Table support" 466 depends on EFI && (X86 || ARM64) 467 help 468 This driver adds support for exposing the ACPI Boottime Graphics 469 Resource Table, which allows the operating system to obtain 470 data from the firmware boot splash. It will appear under 471 /sys/firmware/acpi/bgrt/ . 472 473config ACPI_REDUCED_HARDWARE_ONLY 474 bool "Hardware-reduced ACPI support only" if EXPERT 475 def_bool n 476 help 477 This config item changes the way the ACPI code is built. When this 478 option is selected, the kernel will use a specialized version of 479 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The 480 resulting kernel will be smaller but it will also be restricted to 481 running in ACPI reduced hardware mode ONLY. 482 483 If you are unsure what to do, do not enable this option. 484 485source "drivers/acpi/nfit/Kconfig" 486source "drivers/acpi/numa/Kconfig" 487source "drivers/acpi/apei/Kconfig" 488source "drivers/acpi/dptf/Kconfig" 489 490config ACPI_WATCHDOG 491 bool 492 493config ACPI_EXTLOG 494 tristate "Extended Error Log support" 495 depends on X86_MCE && X86_LOCAL_APIC && EDAC 496 select UEFI_CPER 497 help 498 Certain usages such as Predictive Failure Analysis (PFA) require 499 more information about the error than what can be described in 500 processor machine check banks. Most server processors log 501 additional information about the error in processor uncore 502 registers. Since the addresses and layout of these registers vary 503 widely from one processor to another, system software cannot 504 readily make use of them. To complicate matters further, some of 505 the additional error information cannot be constructed without 506 detailed knowledge about platform topology. 507 508 Enhanced MCA Logging allows firmware to provide additional error 509 information to system software, synchronous with MCE or CMCI. This 510 driver adds support for that functionality with corresponding 511 tracepoint which carries that information to userspace. 512 513config ACPI_ADXL 514 bool 515 516config ACPI_CONFIGFS 517 tristate "ACPI configfs support" 518 select CONFIGFS_FS 519 help 520 Select this option to enable support for ACPI configuration from 521 userspace. The configurable ACPI groups will be visible under 522 /config/acpi, assuming configfs is mounted under /config. 523 524config ACPI_PFRUT 525 tristate "ACPI Platform Firmware Runtime Update and Telemetry" 526 depends on 64BIT 527 help 528 This mechanism allows certain pieces of the platform firmware 529 to be updated on the fly while the system is running (runtime) 530 without the need to restart it, which is key in the cases when 531 the system needs to be available 100% of the time and it cannot 532 afford the downtime related to restarting it, or when the work 533 carried out by the system is particularly important, so it cannot 534 be interrupted, and it is not practical to wait until it is complete. 535 536 The existing firmware code can be modified (driver update) or 537 extended by adding new code to the firmware (code injection). 538 539 Besides, the telemetry driver allows user space to fetch telemetry 540 data from the firmware with the help of the Platform Firmware Runtime 541 Telemetry interface. 542 543 To compile the drivers as modules, choose M here: 544 the modules will be called pfr_update and pfr_telemetry. 545 546if ARM64 547source "drivers/acpi/arm64/Kconfig" 548 549config ACPI_PPTT 550 bool 551endif 552 553config ACPI_PCC 554 bool "ACPI PCC Address Space" 555 depends on PCC 556 default y 557 help 558 The PCC Address Space also referred as PCC Operation Region pertains 559 to the region of PCC subspace that succeeds the PCC signature. 560 561 The PCC Operation Region works in conjunction with the PCC Table 562 (Platform Communications Channel Table). PCC subspaces that are 563 marked for use as PCC Operation Regions must not be used as PCC 564 subspaces for the standard ACPI features such as CPPC, RASF, PDTT and 565 MPST. These standard features must always use the PCC Table instead. 566 567 Enable this feature if you want to set up and install the PCC Address 568 Space handler to handle PCC OpRegion in the firmware. 569 570source "drivers/acpi/pmic/Kconfig" 571 572config ACPI_VIOT 573 bool 574 575config ACPI_PRMT 576 bool "Platform Runtime Mechanism Support" 577 depends on EFI && (X86_64 || ARM64) 578 default y 579 help 580 Platform Runtime Mechanism (PRM) is a firmware interface exposing a 581 set of binary executables that can be called from the AML interpreter 582 or directly from device drivers. 583 584 Say Y to enable the AML interpreter to execute the PRM code. 585 586 While this feature is optional in principle, leaving it out may 587 substantially increase computational overhead related to the 588 initialization of some server systems. 589 590endif # ACPI 591 592config X86_PM_TIMER 593 bool "Power Management Timer Support" if EXPERT 594 depends on X86 && (ACPI || JAILHOUSE_GUEST) 595 default y 596 help 597 The Power Management Timer is available on all ACPI-capable, 598 in most cases even if ACPI is unusable or blacklisted. 599 600 This timing source is not affected by power management features 601 like aggressive processor idling, throttling, frequency and/or 602 voltage scaling, unlike the commonly used Time Stamp Counter 603 (TSC) timing source. 604 605 You should nearly always say Y here because many modern 606 systems require this timer. 607