linux-kernel - [PATCH v3 2/2] tracing: Include Microcode Revision in mce

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Date: Fri, 26 Jan 2024 01:58:00 -0600
From: Avadhut Naik <avadhut.naik@....com>
To: <linux-trace-kernel@...r.kernel.org>, <linux-edac@...r.kernel.org>
CC: <rostedt@...dmis.org>, <tony.luck@...el.com>, <bp@...en8.de>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>, <yazen.ghannam@....com>,
	<avadnaik@....com>
Subject: [PATCH v3 2/2] tracing: Include Microcode Revision in mce_record tracepoint

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

Export it through the tracepoint as it may provide useful information for
debug and analysis.

Signed-off-by: Avadhut Naik <avadhut.naik@....com>
Reviewed-by: Sohil Mehta <sohil.mehta@...el.com>
---
 include/trace/events/mce.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h
index 41a5431545e2..2857f6801e73 100644
--- a/include/trace/events/mce.h
+++ b/include/trace/events/mce.h
@@ -34,6 +34,7 @@ TRACE_EVENT(mce_record,
 		__field(	u8,		cs		)
 		__field(	u8,		bank		)
 		__field(	u8,		cpuvendor	)
+		__field(	u32,		microcode	)
 	),
 
 	TP_fast_assign(
@@ -55,9 +56,10 @@ 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/MISC/SYND: %016Lx/%016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x",
+	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR/MISC/SYND: %016Lx/%016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x, MICROCODE REVISION: %x",
 		__entry->cpu,
 		__entry->mcgcap, __entry->mcgstatus,
 		__entry->bank, __entry->status,
@@ -69,7 +71,8 @@ TRACE_EVENT(mce_record,
 		__entry->cpuvendor, __entry->cpuid,
 		__entry->walltime,
 		__entry->socketid,
-		__entry->apicid)
+		__entry->apicid,
+		__entry->microcode)
 );
 
 #endif /* _TRACE_MCE_H */
-- 
2.34.1