1# SPDX-License-Identifier: GPL-2.0-only 2menuconfig RAS 3 bool "Reliability, Availability and Serviceability (RAS) features" 4 help 5 Reliability, availability and serviceability (RAS) is a computer 6 hardware engineering term. Computers designed with higher levels 7 of RAS have a multitude of features that protect data integrity 8 and help them stay available for long periods of time without 9 failure. 10 11 Reliability can be defined as the probability that the system will 12 produce correct outputs up to some given time. Reliability is 13 enhanced by features that help to avoid, detect and repair hardware 14 faults. 15 16 Availability is the probability a system is operational at a given 17 time, i.e. the amount of time a device is actually operating as the 18 percentage of total time it should be operating. 19 20 Serviceability or maintainability is the simplicity and speed with 21 which a system can be repaired or maintained; if the time to repair 22 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 function 26 correctly, including avoiding data corruption, whereas Availability 27 measures how often it is available for use, even though it may not 28 be functioning correctly. For example, a server may run forever and 29 so have ideal availability, but may be unreliable, with frequent 30 data corruption. 31 32if RAS 33 34source "arch/x86/ras/Kconfig" 35source "drivers/ras/amd/atl/Kconfig" 36 37config RAS_FMPM 38 tristate "FRU Memory Poison Manager" 39 default m 40 depends on AMD_ATL && ACPI_APEI 41 help 42 Support saving and restoring memory error information across reboot 43 using ACPI ERST as persistent storage. Error information is saved with 44 the UEFI CPER "FRU Memory Poison" section format. 45 46 Memory will be retired during boot time and run time depending on 47 platform-specific policies. 48 49endif 50