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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>
This commit is contained in:
Aravind Gopalakrishnan 2016-01-25 20:41:53 +01:00 committed by Ingo Molnar
parent 429893b16d
commit e6c8f1873b
2 changed files with 18 additions and 0 deletions
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4
arch/x86/include/asm/msr-index.h
View File

@ -264,6 +264,10 @@
#define MSR_IA32_MC0_CTL2 0x00000280
#define MSR_IA32_MCx_CTL2(x) (MSR_IA32_MC0_CTL2 + (x))
/* 'SMCA': AMD64 Scalable MCA */
#define MSR_AMD64_SMCA_MC0_CONFIG 0xc0002004
#define MSR_AMD64_SMCA_MCx_CONFIG(x) (MSR_AMD64_SMCA_MC0_CONFIG + 0x10*(x))
#define MSR_P6_PERFCTR0 0x000000c1
#define MSR_P6_PERFCTR1 0x000000c2
#define MSR_P6_EVNTSEL0 0x00000186

14
arch/x86/kernel/cpu/mcheck/mce_amd.c
View File

@ -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))