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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# ACPI Configuration
3#
4
Jan Engelhardt3f2c48c2007-07-03 01:40:59 -04005menuconfig ACPI
Frans Pop355ee5e2007-10-29 17:20:38 -04006 bool "ACPI (Advanced Configuration and Power Interface) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 depends on !IA64_HP_SIM
8 depends on IA64 || X86
Adrian Bunk13001242006-03-28 17:04:00 -05009 depends on PCI
Len Brown243b66e2007-02-15 22:34:36 -050010 select PNP
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 default y
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070012 help
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 Advanced Configuration and Power Interface (ACPI) support for
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070014 Linux requires an ACPI-compliant platform (hardware/firmware),
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 and assumes the presence of OS-directed configuration and power
16 management (OSPM) software. This option will enlarge your
17 kernel by about 70K.
18
19 Linux ACPI provides a robust functional replacement for several
20 legacy configuration and power management interfaces, including
21 the Plug-and-Play BIOS specification (PnP BIOS), the
22 MultiProcessor Specification (MPS), and the Advanced Power
23 Management (APM) specification. If both ACPI and APM support
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070024 are configured, ACPI is used.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070026 The project home page for the Linux ACPI subsystem is here:
Rafael J. Wysockiaaf3d292013-10-10 23:25:58 +020027 <https://01.org/linux-acpi>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29 Linux support for ACPI is based on Intel Corporation's ACPI
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070030 Component Architecture (ACPI CA). For more information on the
31 ACPI CA, see:
32 <http://acpica.org/>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Hanjun Guoc7f52202014-04-08 20:59:48 +080034 ACPI is an open industry specification originally co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
36 it is developed by the ACPI Specification Working Group (ASWG) under
37 the UEFI Forum and any UEFI member can join the ASWG and contribute
38 to the ACPI specification.
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070039 The specification is available at:
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 <http://www.acpi.info>
Hanjun Guoc7f52202014-04-08 20:59:48 +080041 <http://www.uefi.org/acpi/specs>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Len Brown3e11c3c2005-05-27 04:53:27 -040043if ACPI
44
Graeme Gregory8a1664b2014-07-18 18:02:52 +080045config ACPI_LEGACY_TABLES_LOOKUP
46 bool
47
Hanjun Guo46ba51e2014-07-18 18:02:54 +080048config ARCH_MIGHT_HAVE_ACPI_PDC
49 bool
50
Len Brown673d5b42007-07-28 03:33:16 -040051config ACPI_SLEEP
52 bool
Rafael J. Wysocki5d1e0722008-10-22 14:58:43 -040053 depends on SUSPEND || HIBERNATION
Len Brown673d5b42007-07-28 03:33:16 -040054 default y
55
Lan Tianyue2a7c3d2014-05-04 11:07:24 +080056config ACPI_PROCFS_POWER
57 bool "Deprecated power /proc/acpi directories"
58 depends on PROC_FS
59 help
60 For backwards compatibility, this option allows
61 deprecated power /proc/acpi/ directories to exist, even when
62 they have been replaced by functions in /sys.
63 The deprecated directories (and their replacements) include:
64 /proc/acpi/battery/* (/sys/class/power_supply/*)
65 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
66 This option has no effect on /proc/acpi/ directories
67 and functions, which do not yet exist in /sys
68 This option, together with the proc directories, will be
Rafael J. Wysocki3afcb962014-05-10 13:51:36 +020069 deleted in the future.
Lan Tianyue2a7c3d2014-05-04 11:07:24 +080070
71 Say N to delete power /proc/acpi/ directories that have moved to /sys/
72
Thomas Renninger1195a092010-07-16 13:11:31 +020073config ACPI_EC_DEBUGFS
74 tristate "EC read/write access through /sys/kernel/debug/ec"
Thomas Renninger500de3dd2010-07-29 22:30:24 +020075 default n
Thomas Renninger1195a092010-07-16 13:11:31 +020076 help
77 Say N to disable Embedded Controller /sys/kernel/debug interface
78
Thomas Renninger500de3dd2010-07-29 22:30:24 +020079 Be aware that using this interface can confuse your Embedded
80 Controller in a way that a normal reboot is not enough. You then
Andrea Gelmini25cb1bf2010-08-18 15:22:10 +020081 have to power off your system, and remove the laptop battery for
Thomas Renninger500de3dd2010-07-29 22:30:24 +020082 some seconds.
Thomas Renninger1195a092010-07-16 13:11:31 +020083 An Embedded Controller typically is available on laptops and reads
84 sensor values like battery state and temperature.
Thomas Renninger500de3dd2010-07-29 22:30:24 +020085 The kernel accesses the EC through ACPI parsed code provided by BIOS
86 tables. This option allows to access the EC directly without ACPI
87 code being involved.
Thomas Renninger1195a092010-07-16 13:11:31 +020088 Thus this option is a debug option that helps to write ACPI drivers
89 and can be used to identify ACPI code or EC firmware bugs.
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091config ACPI_AC
92 tristate "AC Adapter"
Alexey Starikovskiy5527c8b2007-10-29 17:08:59 -040093 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +080094 select POWER_SUPPLY
Len Brown07fefe42005-08-25 12:22:04 -040095 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -070097 This driver supports the AC Adapter object, which indicates
98 whether a system is on AC or not. If you have a system that can
Len Brown07fefe42005-08-25 12:22:04 -040099 switch between A/C and battery, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700101 To compile this driver as a module, choose M here:
102 the module will be called ac.
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104config ACPI_BATTERY
105 tristate "Battery"
Alexey Starikovskiy5527c8b2007-10-29 17:08:59 -0400106 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +0800107 select POWER_SUPPLY
Len Brown07fefe42005-08-25 12:22:04 -0400108 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 help
110 This driver adds support for battery information through
111 /proc/acpi/battery. If you have a mobile system with a battery,
112 say Y.
113
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700114 To compile this driver as a module, choose M here:
115 the module will be called battery.
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117config ACPI_BUTTON
118 tristate "Button"
Dmitry Torokhovc0968f02006-11-09 00:40:13 -0500119 depends on INPUT
Len Brown07fefe42005-08-25 12:22:04 -0400120 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700122 This driver handles events on the power, sleep, and lid buttons.
Krzysztof Mazur7d13f942013-10-13 00:11:00 +0200123 A daemon reads events from input devices or via netlink and
124 performs user-defined actions such as shutting down the system.
125 This is necessary for software-controlled poweroff.
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700126
127 To compile this driver as a module, choose M here:
128 the module will be called button.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130config ACPI_VIDEO
131 tristate "Video"
Jean Delvare9f380fc2014-03-17 15:46:44 +0100132 depends on X86 && BACKLIGHT_CLASS_DEVICE
Andreas Herrmann03e2bf22007-09-17 23:41:05 +0200133 depends on INPUT
Zhang Rui63c4ec92008-04-21 16:07:13 +0800134 select THERMAL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700136 This driver implements the ACPI Extensions For Display Adapters
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 for integrated graphics devices on motherboard, as specified in
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700138 ACPI 2.0 Specification, Appendix B. This supports basic operations
139 such as defining the video POST device, retrieving EDID information,
140 and setting up a video output.
141
142 To compile this driver as a module, choose M here:
143 the module will be called video.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145config ACPI_FAN
146 tristate "Fan"
Zhang Rui63c4ec92008-04-21 16:07:13 +0800147 select THERMAL
Len Brown07fefe42005-08-25 12:22:04 -0400148 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700150 This driver supports ACPI fan devices, allowing user-mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 applications to perform basic fan control (on, off, status).
152
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700153 To compile this driver as a module, choose M here:
154 the module will be called fan.
155
Len Brownc8f7a622006-07-09 17:22:28 -0400156config ACPI_DOCK
Shaohua Li898b0542008-09-27 11:10:28 +0800157 bool "Dock"
Len Brownc8f7a622006-07-09 17:22:28 -0400158 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700159 This driver supports ACPI-controlled docking stations and removable
160 drive bays such as the IBM Ultrabay and the Dell Module Bay.
Kristen Carlson Accardi01b57e72006-10-20 14:30:25 -0700161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162config ACPI_PROCESSOR
163 tristate "Processor"
Zhang Rui63c4ec92008-04-21 16:07:13 +0800164 select THERMAL
Jean Delvarea4084c12010-10-10 14:54:52 +0200165 select CPU_IDLE
Len Brown07fefe42005-08-25 12:22:04 -0400166 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700168 This driver installs ACPI as the idle handler for Linux and uses
169 ACPI C2 and C3 processor states to save power on systems that
Len Brown07fefe42005-08-25 12:22:04 -0400170 support it. It is required by several flavors of cpufreq
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700171 performance-state drivers.
172
173 To compile this driver as a module, choose M here:
174 the module will be called processor.
Lv Zheng4b88e332013-09-13 13:14:51 +0800175
Zhao Yakuie92b2972010-12-08 10:10:18 +0800176config ACPI_IPMI
177 tristate "IPMI"
Lv Zheng4b88e332013-09-13 13:14:51 +0800178 depends on IPMI_SI
Zhao Yakuie92b2972010-12-08 10:10:18 +0800179 default n
180 help
181 This driver enables the ACPI to access the BMC controller. And it
182 uses the IPMI request/response message to communicate with BMC
183 controller, which can be found on on the server.
184
185 To compile this driver as a module, choose M here:
186 the module will be called as acpi_ipmi.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188config ACPI_HOTPLUG_CPU
Adrian Bunkcbfc1ba2005-07-30 04:18:00 -0400189 bool
Kees Cookf756f282013-01-16 18:53:28 -0800190 depends on ACPI_PROCESSOR && HOTPLUG_CPU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 select ACPI_CONTAINER
Adrian Bunkcbfc1ba2005-07-30 04:18:00 -0400192 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Shaohua Li8e0af512009-07-27 18:11:02 -0400194config ACPI_PROCESSOR_AGGREGATOR
195 tristate "Processor Aggregator"
196 depends on ACPI_PROCESSOR
Len Brownd91f79e2009-09-27 02:35:55 -0400197 depends on X86
Shaohua Li8e0af512009-07-27 18:11:02 -0400198 help
199 ACPI 4.0 defines processor Aggregator, which enables OS to perform
Jiri Slabyc4c4e2a2009-10-09 15:53:24 +0200200 specific processor configuration and control that applies to all
Shaohua Li8e0af512009-07-27 18:11:02 -0400201 processors in the platform. Currently only logical processor idling
202 is defined, which is to reduce power consumption. This driver
Jiri Slabyc4c4e2a2009-10-09 15:53:24 +0200203 supports the new device.
Shaohua Li8e0af512009-07-27 18:11:02 -0400204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205config ACPI_THERMAL
206 tristate "Thermal Zone"
207 depends on ACPI_PROCESSOR
Zhang Rui3f655ef2008-01-17 15:51:11 +0800208 select THERMAL
Len Brown07fefe42005-08-25 12:22:04 -0400209 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700211 This driver supports ACPI thermal zones. Most mobile and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 some desktop systems support ACPI thermal zones. It is HIGHLY
213 recommended that this option be enabled, as your processor(s)
214 may be damaged without it.
215
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700216 To compile this driver as a module, choose M here:
217 the module will be called thermal.
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219config ACPI_NUMA
220 bool "NUMA support"
221 depends on NUMA
Yasunori Goto762834e2006-06-23 02:03:19 -0700222 depends on (X86 || IA64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 default y if IA64_GENERIC || IA64_SGI_SN2
224
Randy Dunlap7ce95732008-02-22 11:25:04 -0800225config ACPI_CUSTOM_DSDT_FILE
226 string "Custom DSDT Table file to include"
227 default ""
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 depends on !STANDALONE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 help
Len Brownd89e9d62008-02-06 19:28:02 -0500230 This option supports a custom DSDT by linking it into the kernel.
231 See Documentation/acpi/dsdt-override.txt
232
Uwe Zeisbergerc30fe7f2006-03-24 18:23:14 +0100233 Enter the full path name to the file which includes the AmlCode
234 declaration.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Randy Dunlap7ce95732008-02-22 11:25:04 -0800236 If unsure, don't enter a file name.
237
238config ACPI_CUSTOM_DSDT
239 bool
240 default ACPI_CUSTOM_DSDT_FILE != ""
241
Thomas Renninger53aac442012-10-01 00:23:54 +0200242config ACPI_INITRD_TABLE_OVERRIDE
Thomas Renninger565d9562013-02-22 14:12:22 +0100243 bool "ACPI tables override via initrd"
244 depends on BLK_DEV_INITRD && X86
Thomas Renninger53aac442012-10-01 00:23:54 +0200245 default n
246 help
247 This option provides functionality to override arbitrary ACPI tables
248 via initrd. No functional change if no ACPI tables are passed via
249 initrd, therefore it's safe to say Y.
250 See Documentation/acpi/initrd_table_override.txt for details
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252config ACPI_DEBUG
253 bool "Debug Statements"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 default n
255 help
Bjorn Helgaasa0d84a92008-11-07 16:58:05 -0700256 The ACPI subsystem can produce debug output. Saying Y enables this
257 output and increases the kernel size by around 50K.
258
259 Use the acpi.debug_layer and acpi.debug_level kernel command-line
260 parameters documented in Documentation/acpi/debug.txt and
261 Documentation/kernel-parameters.txt to control the type and
262 amount of debug output.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Alex Chiang8344b562008-06-10 15:30:42 -0600264config ACPI_PCI_SLOT
Jiang Liuab1a2e02013-01-19 00:07:42 +0800265 bool "PCI slot detection driver"
Alex Chiang268a03a2009-06-17 19:03:57 -0600266 depends on SYSFS
Alex Chiang8344b562008-06-10 15:30:42 -0600267 default n
268 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700269 This driver creates entries in /sys/bus/pci/slots/ for all PCI
270 slots in the system. This can help correlate PCI bus addresses,
271 i.e., segment/bus/device/function tuples, with physical slots in
272 the system. If you are unsure, say N.
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274config X86_PM_TIMER
David Rientjes6a108a12011-01-20 14:44:16 -0800275 bool "Power Management Timer Support" if EXPERT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 depends on X86
Len Brown07fefe42005-08-25 12:22:04 -0400277 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 help
279 The Power Management Timer is available on all ACPI-capable,
280 in most cases even if ACPI is unusable or blacklisted.
281
Matt LaPlantec73a6682006-10-03 22:24:43 +0200282 This timing source is not affected by power management features
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 like aggressive processor idling, throttling, frequency and/or
284 voltage scaling, unlike the commonly used Time Stamp Counter
285 (TSC) timing source.
286
Andi Kleene78256b2006-02-26 04:18:37 +0100287 You should nearly always say Y here because many modern
288 systems require this timer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290config ACPI_CONTAINER
Linus Torvalds06991c22013-02-21 12:05:51 -0800291 bool "Container and Module Devices"
Paul Bolleea6a4582013-03-11 10:53:48 +0000292 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700293 help
294 This driver supports ACPI Container and Module devices (IDs
295 ACPI0004, PNP0A05, and PNP0A06).
Keiichiro Tokunaga45b1b192005-03-02 00:00:00 -0500296
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700297 This helps support hotplug of nodes, CPUs, and memory.
298
299 To compile this driver as a module, choose M here:
300 the module will be called container.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302config ACPI_HOTPLUG_MEMORY
Rafael J. Wysocki0a347642013-03-03 23:18:03 +0100303 bool "Memory Hotplug"
Yasunori Gotobc02af92006-06-27 02:53:30 -0700304 depends on MEMORY_HOTPLUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700306 This driver supports ACPI memory hotplug. The driver
307 fields notifications on ACPI memory devices (PNP0C80),
308 which represent memory ranges that may be onlined or
309 offlined during runtime.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700311 If your hardware and firmware do not support adding or
312 removing memory devices at runtime, you need not enable
313 this driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700315 To compile this driver as a module, choose M here:
316 the module will be called acpi_memhotplug.
Rich Townsend3f86b832006-07-01 11:36:54 -0400317
318config ACPI_SBS
Alexey Starikovskiy94f6c082007-09-26 19:43:48 +0400319 tristate "Smart Battery System"
Vladimir Lebedevb4150fc2007-03-19 17:45:50 +0300320 depends on X86
Zhang Rui1b3d4c32010-10-08 13:54:57 +0800321 select POWER_SUPPLY
Rich Townsend3f86b832006-07-01 11:36:54 -0400322 help
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700323 This driver supports the Smart Battery System, another
Alexey Starikovskiy94f6c082007-09-26 19:43:48 +0400324 type of access to battery information, found on some laptops.
Rich Townsend3f86b832006-07-01 11:36:54 -0400325
Bjorn Helgaas1c48aa32009-02-19 14:45:47 -0700326 To compile this driver as a module, choose M here:
327 the modules will be called sbs and sbshc.
328
Huang Ying801eab82010-05-18 14:35:17 +0800329config ACPI_HED
330 tristate "Hardware Error Device"
331 help
332 This driver supports the Hardware Error Device (PNP0C33),
333 which is used to report some hardware errors notified via
334 SCI, mainly the corrected errors.
335
Thomas Renninger526b4af2011-05-26 12:26:24 +0200336config ACPI_CUSTOM_METHOD
337 tristate "Allow ACPI methods to be inserted/replaced at run time"
338 depends on DEBUG_FS
339 default n
340 help
Justin P. Mattockbd1b2a52012-01-03 08:49:48 -0800341 This debug facility allows ACPI AML methods to be inserted and/or
Thomas Renninger526b4af2011-05-26 12:26:24 +0200342 replaced without rebooting the system. For details refer to:
343 Documentation/acpi/method-customizing.txt.
344
345 NOTE: This option is security sensitive, because it allows arbitrary
346 kernel memory to be written to by root (uid=0) users, allowing them
347 to bypass certain security measures (e.g. if root is not allowed to
348 load additional kernel modules after boot, this feature may be used
349 to override that restriction).
350
Matthew Garrettd1ff4b12012-01-31 13:19:20 -0500351config ACPI_BGRT
Josh Triplett2223af32012-09-28 17:57:05 -0700352 bool "Boottime Graphics Resource Table support"
Tony Lucke66cd532013-04-03 13:17:20 +0200353 depends on EFI && X86
Matthew Garrettd1ff4b12012-01-31 13:19:20 -0500354 help
355 This driver adds support for exposing the ACPI Boottime Graphics
356 Resource Table, which allows the operating system to obtain
357 data from the firmware boot splash. It will appear under
358 /sys/firmware/acpi/bgrt/ .
359
Al Stoneaf1ae782014-01-17 11:51:30 -0700360config ACPI_REDUCED_HARDWARE_ONLY
361 bool "Hardware-reduced ACPI support only" if EXPERT
362 def_bool n
363 depends on ACPI
364 help
365 This config item changes the way the ACPI code is built. When this
366 option is selected, the kernel will use a specialized version of
367 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
368 resulting kernel will be smaller but it will also be restricted to
369 running in ACPI reduced hardware mode ONLY.
370
371 If you are unsure what to do, do not enable this option.
372
Huang Yinga643ce22010-05-18 14:35:12 +0800373source "drivers/acpi/apei/Kconfig"
374
Chen, Gong4b3db702013-10-21 14:29:25 -0700375config ACPI_EXTLOG
376 tristate "Extended Error Log support"
Luck, Tony9ebddac2013-11-08 14:03:33 -0800377 depends on X86_MCE && X86_LOCAL_APIC
Luck, Tony7ea6c6c2013-10-28 14:06:55 -0700378 select UEFI_CPER
Chen, Gong2dfb7d52014-06-17 22:33:07 -0400379 select RAS
Chen, Gong4b3db702013-10-21 14:29:25 -0700380 default n
381 help
382 Certain usages such as Predictive Failure Analysis (PFA) require
383 more information about the error than what can be described in
384 processor machine check banks. Most server processors log
385 additional information about the error in processor uncore
386 registers. Since the addresses and layout of these registers vary
387 widely from one processor to another, system software cannot
388 readily make use of them. To complicate matters further, some of
389 the additional error information cannot be constructed without
390 detailed knowledge about platform topology.
391
392 Enhanced MCA Logging allows firmware to provide additional error
393 information to system software, synchronous with MCE or CMCI. This
Chen, Gong2dfb7d52014-06-17 22:33:07 -0400394 driver adds support for that functionality with corresponding
395 tracepoint which carries that information to userspace.
Chen, Gong4b3db702013-10-21 14:29:25 -0700396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397endif # ACPI