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x86/mce: Provide boot argument to honour bios-set CMCI threshold

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The ACPI spec doesn't provide for a way for the bios to pass down
recommended thresholds to the OS on a _per-bank_ basis. This patch adds
a new boot option, which if passed, tells Linux to use CMCI thresholds
set by the bios.

As fail-safe, we initialize threshold to 1 if some banks have not been
initialized by the bios and warn the user.

Signed-off-by: Naveen N. Rao <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
Naveen N. Rao 2012-09-27 10:08:00 -07:00 • committed by Tony Luck
commit 450cc20103
4 changed files with 50 additions and 3 deletions
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7
Documentation/x86/x86_64/boot-options.txt
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@ -50,6 +50,13 @@ Machine check
monarchtimeout:
Sets the time in us to wait for other CPUs on machine checks. 0
to disable.
mce=bios_cmci_threshold
Don't overwrite the bios-set CMCI threshold. This boot option
prevents Linux from overwriting the CMCI threshold set by the
bios. Without this option, Linux always sets the CMCI
threshold to 1. Enabling this may make memory predictive failure
analysis less effective if the bios sets thresholds for memory
errors since we will not see details for all errors.
nomce (for compatibility with i386): same as mce=off