diff --git a/drivers/cxl/core/trace.h b/drivers/cxl/core/trace.h
index 8389a94adb1a6..7305974e2301e 100644
--- a/drivers/cxl/core/trace.h
+++ b/drivers/cxl/core/trace.h
@@ -166,11 +166,13 @@ TRACE_EVENT(cxl_overflow,
 #define CXL_EVENT_RECORD_FLAG_MAINT_NEEDED	BIT(3)
 #define CXL_EVENT_RECORD_FLAG_PERF_DEGRADED	BIT(4)
 #define CXL_EVENT_RECORD_FLAG_HW_REPLACE	BIT(5)
+#define CXL_EVENT_RECORD_FLAG_MAINT_OP_SUB_CLASS_VALID	BIT(6)
 #define show_hdr_flags(flags)	__print_flags(flags, " | ",			   \
 	{ CXL_EVENT_RECORD_FLAG_PERMANENT,	"PERMANENT_CONDITION"		}, \
 	{ CXL_EVENT_RECORD_FLAG_MAINT_NEEDED,	"MAINTENANCE_NEEDED"		}, \
 	{ CXL_EVENT_RECORD_FLAG_PERF_DEGRADED,	"PERFORMANCE_DEGRADED"		}, \
-	{ CXL_EVENT_RECORD_FLAG_HW_REPLACE,	"HARDWARE_REPLACEMENT_NEEDED"	}  \
+	{ CXL_EVENT_RECORD_FLAG_HW_REPLACE,	"HARDWARE_REPLACEMENT_NEEDED"	},  \
+	{ CXL_EVENT_RECORD_FLAG_MAINT_OP_SUB_CLASS_VALID,	"MAINT_OP_SUB_CLASS_VALID" }	\
 )
 
 /*
@@ -197,7 +199,8 @@ TRACE_EVENT(cxl_overflow,
 	__field(u16, hdr_related_handle)			\
 	__field(u64, hdr_timestamp)				\
 	__field(u8, hdr_length)					\
-	__field(u8, hdr_maint_op_class)
+	__field(u8, hdr_maint_op_class)				\
+	__field(u8, hdr_maint_op_sub_class)
 
 #define CXL_EVT_TP_fast_assign(cxlmd, l, hdr)					\
 	__assign_str(memdev);				\
@@ -209,17 +212,19 @@ TRACE_EVENT(cxl_overflow,
 	__entry->hdr_handle = le16_to_cpu((hdr).handle);			\
 	__entry->hdr_related_handle = le16_to_cpu((hdr).related_handle);	\
 	__entry->hdr_timestamp = le64_to_cpu((hdr).timestamp);			\
-	__entry->hdr_maint_op_class = (hdr).maint_op_class
+	__entry->hdr_maint_op_class = (hdr).maint_op_class;			\
+	__entry->hdr_maint_op_sub_class = (hdr).maint_op_sub_class
 
 #define CXL_EVT_TP_printk(fmt, ...) \
 	TP_printk("memdev=%s host=%s serial=%lld log=%s : time=%llu uuid=%pUb "	\
 		"len=%d flags='%s' handle=%x related_handle=%x "		\
-		"maint_op_class=%u : " fmt,					\
+		"maint_op_class=%u maint_op_sub_class=%u : " fmt,		\
 		__get_str(memdev), __get_str(host), __entry->serial,		\
 		cxl_event_log_type_str(__entry->log),				\
 		__entry->hdr_timestamp, &__entry->hdr_uuid, __entry->hdr_length,\
 		show_hdr_flags(__entry->hdr_flags), __entry->hdr_handle,	\
 		__entry->hdr_related_handle, __entry->hdr_maint_op_class,	\
+		__entry->hdr_maint_op_sub_class,	\
 		##__VA_ARGS__)
 
 TRACE_EVENT(cxl_generic_event,
diff --git a/include/cxl/event.h b/include/cxl/event.h
index 0bea1afbd747c..e1d485ad376b4 100644
--- a/include/cxl/event.h
+++ b/include/cxl/event.h
@@ -18,7 +18,8 @@ struct cxl_event_record_hdr {
 	__le16 related_handle;
 	__le64 timestamp;
 	u8 maint_op_class;
-	u8 reserved[15];
+	u8 maint_op_sub_class;
+	u8 reserved[14];
 } __packed;
 
 struct cxl_event_media_hdr {