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