diff options
| author | Yazen Ghannam <yazen.ghannam@amd.com> | 2025-11-04 14:55:45 +0000 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-11-21 10:32:28 +0100 |
| commit | eeb3f76d73baed4c8ecc883e1eaafba3cb8aae1d (patch) | |
| tree | 4db68a23532ca422dc5e0d10390fa137d6c1547c /arch/x86/kernel/cpu/mce/internal.h | |
| parent | 56f17be67a332d146821d1a812ab16388d07ace7 (diff) | |
x86/mce: Save and use APEI corrected threshold limit
The MCA threshold limit generally is not something that needs to change during
runtime. It is common for a system administrator to decide on a policy for
their managed systems.
If MCA thresholding is OS-managed, then the threshold limit must be set at
every boot. However, many systems allow the user to set a value in their BIOS.
And this is reported through an APEI HEST entry even if thresholding is not in
FW-First mode.
Use this value, if available, to set the OS-managed threshold limit. Users
can still override it through sysfs if desired for testing or debug.
APEI is parsed after MCE is initialized. So reset the thresholding blocks
later to pick up the threshold limit.
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20251104-wip-mca-updates-v8-0-66c8eacf67b9@amd.com
Diffstat (limited to 'arch/x86/kernel/cpu/mce/internal.h')
| -rw-r--r-- | arch/x86/kernel/cpu/mce/internal.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h index b0e00ec5cc8c..4cf16fa7c260 100644 --- a/arch/x86/kernel/cpu/mce/internal.h +++ b/arch/x86/kernel/cpu/mce/internal.h @@ -67,6 +67,7 @@ void mce_track_storm(struct mce *mce); void mce_inherit_storm(unsigned int bank); bool mce_get_storm_mode(void); void mce_set_storm_mode(bool storm); +u32 mce_get_apei_thr_limit(void); #else static inline void cmci_storm_begin(unsigned int bank) {} static inline void cmci_storm_end(unsigned int bank) {} @@ -74,6 +75,7 @@ static inline void mce_track_storm(struct mce *mce) {} static inline void mce_inherit_storm(unsigned int bank) {} static inline bool mce_get_storm_mode(void) { return false; } static inline void mce_set_storm_mode(bool storm) {} +static inline u32 mce_get_apei_thr_limit(void) { return 0; } #endif /* |