diff options
| author | Tony Luck <tony.luck@intel.com> | 2023-11-15 22:54:50 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-12-15 16:53:42 +0300 |
| commit | 1f68ce2a027250aeeb1756391110cdc4dc97c797 (patch) | |
| tree | 534140189405bf3a60fad66ddaf27829f985979b /arch/x86/kernel/cpu/mce/internal.h | |
| parent | 7eae17c4add5de46efcca45356388f480103e6d9 (diff) | |
| download | linux-1f68ce2a027250aeeb1756391110cdc4dc97c797.tar.xz | |
x86/mce: Handle Intel threshold interrupt storms
Add an Intel specific hook into machine_check_poll() to keep track of
per-CPU, per-bank corrected error logs (with a stub for the
CONFIG_MCE_INTEL=n case).
When a storm is observed the rate of interrupts is reduced by setting
a large threshold value for this bank in IA32_MCi_CTL2. This bank is
added to the bitmap of banks for this CPU to poll. The polling rate is
increased to once per second.
When a storm ends reset the threshold in IA32_MCi_CTL2 back to 1, remove
the bank from the bitmap for polling, and change the polling rate back
to the default.
If a CPU with banks in storm mode is taken offline, the new CPU that
inherits ownership of those banks takes over management of storm(s) in
the inherited bank(s).
The cmci_discover() function was already very large. These changes
pushed it well over the top. Refactor with three helper functions to
bring it back under control.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231115195450.12963-4-tony.luck@intel.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 157b2f295667..01f8f03969e6 100644 --- a/arch/x86/kernel/cpu/mce/internal.h +++ b/arch/x86/kernel/cpu/mce/internal.h @@ -41,6 +41,7 @@ struct dentry *mce_get_debugfs_dir(void); extern mce_banks_t mce_banks_ce_disabled; #ifdef CONFIG_X86_MCE_INTEL +void mce_intel_handle_storm(int bank, bool on); void cmci_disable_bank(int bank); void intel_init_cmci(void); void intel_init_lmce(void); @@ -48,6 +49,7 @@ void intel_clear_lmce(void); bool intel_filter_mce(struct mce *m); bool intel_mce_usable_address(struct mce *m); #else +static inline void mce_intel_handle_storm(int bank, bool on) { } static inline void cmci_disable_bank(int bank) { } static inline void intel_init_cmci(void) { } static inline void intel_init_lmce(void) { } |