x86/mce: Remove old CMCI storm mitigation code

Browse source

When a "storm" of corrected machine check interrupts (CMCI) is detected
this code mitigates by disabling CMCI interrupt signalling from all of
the banks owned by the CPU that saw the storm.

There are problems with this approach:

1) It is very coarse grained. In all likelihood only one of the banks
   was generating the interrupts, but CMCI is disabled for all.  This
   means Linux may delay seeing and processing errors logged from other
   banks.

2) Although CMCI stands for Corrected Machine Check Interrupt, it is
   also used to signal when an uncorrected error is logged. This is
   a problem because these errors should be handled in a timely manner.

Delete all this code in preparation for a finer grained solution.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Tested-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20231115195450.12963-2-tony.luck@intel.com

...

This commit is contained in:

Tony Luck 2023-11-15 11:54:48 -08:00 • committed by Borislav Petkov (AMD)

parent cf0573939d

commit 3ed57b41a4

3 changed files with 1 additions and 170 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

20

arch/x86/kernel/cpu/mce/core.c

View file

145

arch/x86/kernel/cpu/mce/intel.c

View file

6

arch/x86/kernel/cpu/mce/internal.h

View file