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| author | Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com> | 2016-01-25 20:41:53 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-01 10:53:59 +0100 |
| commit | e6c8f1873be8a14c7e44202df1f7e6ea61bf3352 (patch) | |
| tree | 53ce4fa46053d0fce438d039e18f176773eb92be /arch/x86/kernel/cpu | |
| parent | 429893b16d35d309ed6b35136aad5f908a08d9b9 (diff) | |
| download | linux-e6c8f1873be8a14c7e44202df1f7e6ea61bf3352.tar.gz linux-e6c8f1873be8a14c7e44202df1f7e6ea61bf3352.tar.bz2 linux-e6c8f1873be8a14c7e44202df1f7e6ea61bf3352.zip | |
x86/mce/AMD: Set MCAX Enable bit
It is required for the OS to acknowledge that it is using the
MCAX register set and its associated fields by setting the
'McaXEnable' bit in each bank's MCi_CONFIG register. If it is
not set, then all UC errors will cause a system panic.
Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1453750913-4781-9-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce_amd.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c index f2860a118b71..88de27bd5797 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c @@ -54,6 +54,14 @@ /* Threshold LVT offset is at MSR0xC0000410[15:12] */ #define SMCA_THR_LVT_OFF 0xF000 +/* + * OS is required to set the MCAX bit to acknowledge that it is now using the + * new MSR ranges and new registers under each bank. It also means that the OS + * will configure deferred errors in the new MCx_CONFIG register. If the bit is + * not set, uncorrectable errors will cause a system panic. + */ +#define SMCA_MCAX_EN_OFF 0x1 + static const char * const th_names[] = { "load_store", "insn_fetch", @@ -292,6 +300,12 @@ prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr, if (mce_flags.smca) { u32 smca_low, smca_high; + u32 smca_addr = MSR_AMD64_SMCA_MCx_CONFIG(bank); + + if (!rdmsr_safe(smca_addr, &smca_low, &smca_high)) { + smca_high |= SMCA_MCAX_EN_OFF; + wrmsr(smca_addr, smca_low, smca_high); + } /* Gather LVT offset for thresholding: */ if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high)) |