[PATCH 1/4] x86/mce: Define 'SUCCOR' cpuid bit

Aravind Gopalakrishnan
2015-04-30T19:52:47Z

SUCCOR stands for S/W UnCorrectable error COntainment and Recovery.
It indicates support for data poisoning in HW and deferred error
interrupts.

Add new bitfield in mce_vendor_flags for this.
We use this to verify prescence of deferred error interrupts
before we enable them in mce_amd.c

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
---
arch/x86/include/asm/mce.h | 3 ++-
arch/x86/kernel/cpu/mcheck/mce.c | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 1f5a86d..dfcb664 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -118,7 +118,8 @@ struct mca_config {

struct mce_vendor_flags {
__u64 overflow_recov : 1, /* cpuid_ebx(80000007) */
- __reserved_0 : 63;
+ succor : 1,
+ __reserved_0 : 62;
};
extern struct mce_vendor_flags mce_flags;

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index e535533..de61f62e 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1640,6 +1640,7 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
case X86_VENDOR_AMD:
mce_amd_feature_init(c);
mce_flags.overflow_recov = cpuid_ebx(0x80000007) & 0x1;
+ mce_flags.succor = (cpuid_ebx(0x80000007) & 0x2) ? 1 : 0;
break;
default:
break;
--
1.9.1