x86/MCE: Save microcode revision in machine check records

commit fa94d0c6e0f3431523f5701084d799c77c7d4a4f upstream.

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 <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Yazen Ghannam <yazen.ghannam@amd.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20180301233449.24311-1-tony.luck@intel.com
[bwh: Backported to 3.2:
 - Add other new fields to struct mce, to match upstream UAPI
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/include/uapi/asm/mce.h b/arch/x86/include/uapi/asm/mce.h
index a0eab85ce7b8283cc5f194ec175e8076669a762f..c9872a4585fe89ffe49be34f6bbe301232f44bbb 100644 (file)
--- a/arch/x86/include/uapi/asm/mce.h
+++ b/arch/x86/include/uapi/asm/mce.h
@@ -25,6 +25,10 @@ struct mce {
        __u32 socketid; /* CPU socket ID */
        __u32 apicid;   /* CPU initial apic ID */
        __u64 mcgcap;   /* MCGCAP MSR: machine check capabilities of CPU */
+       __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)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 36613d9a3d5c6620aeeac446023fda31631aed9a..e040258fd4a0fdbdfb25b76fe6a05fa08f843186 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -135,6 +135,8 @@ void mce_setup(struct mce *m)
        m->socketid = cpu_data(m->extcpu).phys_proc_id;
        m->apicid = cpu_data(m->extcpu).initial_apicid;
        rdmsrl(MSR_IA32_MCG_CAP, m->mcgcap);
+
+       m->microcode = boot_cpu_data.microcode;
 }
 
 DEFINE_PER_CPU(struct mce, injectm);
@@ -282,7 +284,7 @@ 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);
 
        /*
         * Print out human-readable details about the MCE error,