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x86/mce: Do not clear bank's poll bit in mce_poll_banks on AMD SMCA systems

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Currently, when a CMCI storm detected on a Machine Check bank, subsides, the
bank's corresponding bit in the mce_poll_banks per-CPU variable is cleared
unconditionally by cmci_storm_end().

On AMD SMCA systems, this essentially disables polling on that particular bank
on that CPU. Consequently, any subsequent correctable errors or storms will not
be logged.

Since AMD SMCA systems allow banks to be managed by both polling and
interrupts, the polling banks bitmap for a CPU, i.e., mce_poll_banks, should
not be modified when a storm subsides.

Fixes: 7eae17c4ad ("x86/mce: Add per-bank CMCI storm mitigation")
Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20251121190542.2447913-2-avadhut.naik@amd.com
This commit is contained in:
Avadhut Naik 2025-11-21 19:04:04 +00:00 committed by Borislav Petkov (AMD)
parent 821f5fe4db
commit d7ac083f09
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/cpu/mce/threshold.c
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@ -98,7 +98,8 @@ void cmci_storm_end(unsigned int bank)
{
struct mca_storm_desc *storm = this_cpu_ptr(&storm_desc);
__clear_bit(bank, this_cpu_ptr(mce_poll_banks));
if (!mce_flags.amd_threshold)
__clear_bit(bank, this_cpu_ptr(mce_poll_banks));
storm->banks[bank].history = 0;
storm->banks[bank].in_storm_mode = false;