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# SPDX-License-Identifier: GPL-2.0-only
menuconfig RAS
bool "Reliability, Availability and Serviceability (RAS) features"
help
Reliability, availability and serviceability (RAS) is a computer
hardware engineering term. Computers designed with higher levels
of RAS have a multitude of features that protect data integrity
and help them stay available for long periods of time without
failure.
Reliability can be defined as the probability that the system will
produce correct outputs up to some given time. Reliability is
enhanced by features that help to avoid, detect and repair hardware
faults.
Availability is the probability a system is operational at a given
time, i.e. the amount of time a device is actually operating as the
percentage of total time it should be operating.
Serviceability or maintainability is the simplicity and speed with
which a system can be repaired or maintained; if the time to repair
a failed system increases, then availability will decrease.
Note that Reliability and Availability are distinct concepts:
Reliability is a measure of the ability of a system to function
correctly, including avoiding data corruption, whereas Availability
measures how often it is available for use, even though it may not
be functioning correctly. For example, a server may run forever and
so have ideal availability, but may be unreliable, with frequent
data corruption.
if RAS
config RAS_CEC
bool "Correctable Errors Collector"
depends on X86_MCE && MEMORY_FAILURE && DEBUG_FS
help
This is a small cache which collects correctable memory errors per 4K
page PFN and counts their repeated occurrence. Once the counter for a
PFN overflows, we try to soft-offline that page as we take it to mean
that it has reached a relatively high error count and would probably
be best if we don't use it anymore.
Bear in mind that this is absolutely useless if your platform doesn't
have ECC DIMMs and doesn't have DRAM ECC checking enabled in the BIOS.
config RAS_CEC_DEBUG
bool "CEC debugging machinery"
default n
depends on RAS_CEC
help
Add extra files to (debugfs)/ras/cec to test the correctable error
collector feature. "pfn" is a writable file that allows user to
simulate an error in a particular page frame. "array" is a read-only
file that dumps out the current state of all pages logged so far.
source "drivers/ras/amd/atl/Kconfig"
config RAS_FMPM
tristate "FRU Memory Poison Manager"
default m
depends on AMD_ATL && ACPI_APEI
help
Support saving and restoring memory error information across reboot
using ACPI ERST as persistent storage. Error information is saved with
the UEFI CPER "FRU Memory Poison" section format.
Memory will be retired during boot time and run time depending on
platform-specific policies.
endif
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