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x86/MCE: Save microcode revision in machine check records

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Updating microcode used to be relatively rare. Now that it has become
more common we should save the microcode version in a machine check
record to make sure that those people looking at the error have this
important information bundled with the rest of the logged information.

[ Borislav: Simplify a bit. ]

Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Yazen Ghannam <[email protected]>
Cc: linux-edac <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
This commit is contained in:
Tony Luck authored and Thomas Gleixner committed 2018-03-08 15:34:49 +01:00
1 parent 1b88accf6a
commit fa94d0c6e0
2 files changed
+4 -1
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arch/x86/include/uapi/asm/mce.h
+1
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@@ -30,6 +30,7 @@ struct mce {
__u64 synd; /* MCA_SYND MSR: only valid on SMCA systems */
__u64 ipid; /* MCA_IPID MSR: only valid on SMCA systems */
__u64 ppin; /* Protected Processor Inventory Number */
__u32 microcode;/* Microcode revision */
};
#define MCE_GET_RECORD_LEN _IOR('M', 1, int)
arch/x86/kernel/cpu/mcheck/mce.c
+3 -1
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@@ -130,6 +130,8 @@ void mce_setup(struct mce *m)
if (this_cpu_has(X86_FEATURE_INTEL_PPIN))
rdmsrl(MSR_PPIN, m->ppin);
m->microcode = boot_cpu_data.microcode;
}
DEFINE_PER_CPU(struct mce, injectm);
@@ -262,7 +264,7 @@ static void __print_mce(struct mce *m)
*/
pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n",
m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid,
cpu_data(m->extcpu).microcode);
m->microcode);
}
static void print_mce(struct mce *m)