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1# SPDX-License-Identifier: GPL-2.0-only2menuconfig RAS3 bool "Reliability, Availability and Serviceability (RAS) features"4 help5 Reliability, availability and serviceability (RAS) is a computer6 hardware engineering term. Computers designed with higher levels7 of RAS have a multitude of features that protect data integrity8 and help them stay available for long periods of time without9 failure.10 11 Reliability can be defined as the probability that the system will12 produce correct outputs up to some given time. Reliability is13 enhanced by features that help to avoid, detect and repair hardware14 faults.15 16 Availability is the probability a system is operational at a given17 time, i.e. the amount of time a device is actually operating as the18 percentage of total time it should be operating.19 20 Serviceability or maintainability is the simplicity and speed with21 which a system can be repaired or maintained; if the time to repair22 a failed system increases, then availability will decrease.23 24 Note that Reliability and Availability are distinct concepts:25 Reliability is a measure of the ability of a system to function26 correctly, including avoiding data corruption, whereas Availability27 measures how often it is available for use, even though it may not28 be functioning correctly. For example, a server may run forever and29 so have ideal availability, but may be unreliable, with frequent30 data corruption.31 32if RAS33 34source "arch/x86/ras/Kconfig"35source "drivers/ras/amd/atl/Kconfig"36 37config RAS_FMPM38 tristate "FRU Memory Poison Manager"39 default m40 depends on AMD_ATL && ACPI_APEI41 help42 Support saving and restoring memory error information across reboot43 using ACPI ERST as persistent storage. Error information is saved with44 the UEFI CPER "FRU Memory Poison" section format.45 46 Memory will be retired during boot time and run time depending on47 platform-specific policies.48 49endif50