tracing: Add the ::microcode field to the mce_record tracepoint

JIRA: https://issues.redhat.com/browse/RHEL-55136

commit 186d7ef
Author: Avadhut Naik <avadhut.naik@amd.com>
Date:   Mon Apr 1 12:14:55 2024 -0500

    tracing: Add the ::microcode field to the mce_record tracepoint

    Currently, the microcode field (Microcode Revision) of 'struct mce' is not
    exposed to userspace through the mce_record tracepoint.

    Knowing the microcode version on which the MCE was received is critical
    information for debugging. If the version is not recorded, later attempts
    to acquire the version might result in discrepancies since it can be
    changed at runtime.

    Add microcode version to the tracepoint to prevent ambiguity over
    the active version on the system when the MCE was received.

    Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
    Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
    Reviewed-by: Tony Luck <tony.luck@intel.com>
    Link: https://lore.kernel.org/r/20240401171455.1737976-3-avadhut.naik@amd.com

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

include/trace/events/mce.h

@@ -42,6 +42,7 @@ TRACE_EVENT(mce_record,
 		__field(	u8,		cs		)
 		__field(	u8,		bank		)
 		__field(	u8,		cpuvendor	)
+		__field(	u32,		microcode	)
 	),
 
 	TP_fast_assign(
@@ -63,9 +64,10 @@ TRACE_EVENT(mce_record,
 		__entry->cs		= m->cs;
 		__entry->bank		= m->bank;
 		__entry->cpuvendor	= m->cpuvendor;
+		__entry->microcode	= m->microcode;
 	),
 
-	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR: %016Lx, MISC: %016Lx, SYND: %016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, vendor: %u, CPUID: %x, time: %llu, socket: %u, APIC: %x",
+	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR: %016Lx, MISC: %016Lx, SYND: %016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, vendor: %u, CPUID: %x, time: %llu, socket: %u, APIC: %x, microcode: %x",
 		__entry->cpu,
 		__entry->mcgcap, __entry->mcgstatus,
 		__entry->bank, __entry->status,
@@ -80,7 +82,8 @@ TRACE_EVENT(mce_record,
 		__entry->cpuid,
 		__entry->walltime,
 		__entry->socketid,
-		__entry->apicid)
+		__entry->apicid,
+		__entry->microcode)
 );
 
 #endif /* _TRACE_MCE_H */