linux-kernel - [RFC PATCH 6/7] include: trace: Add Telemetry trace events

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Message-ID: <20250620192813.2463367-7-cristian.marussi@arm.com>
Date: Fri, 20 Jun 2025 20:28:12 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org
Cc: sudeep.holla@....com,
	james.quinlan@...adcom.com,
	f.fainelli@...il.com,
	vincent.guittot@...aro.org,
	etienne.carriere@...com,
	peng.fan@....nxp.com,
	michal.simek@....com,
	quic_sibis@...cinc.com,
	dan.carpenter@...aro.org,
	d-gole@...com,
	souvik.chakravarty@....com,
	Cristian Marussi <cristian.marussi@....com>
Subject: [RFC PATCH 6/7] include: trace: Add Telemetry trace events

Add custom traces to report Telemetry failed accesses and to report when DE
values are updated internally after a notification is processed.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 include/trace/events/scmi.h | 48 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/scmi.h b/include/trace/events/scmi.h
index 127300481123..471f028f36db 100644
--- a/include/trace/events/scmi.h
+++ b/include/trace/events/scmi.h
@@ -7,7 +7,8 @@
 
 #include <linux/tracepoint.h>
 
-#define TRACE_SCMI_MAX_TAG_LEN	6
+#define TRACE_SCMI_MAX_TAG_LEN		6
+#define TRACE_SCMI_TLM_MAX_TAG_LEN	16
 
 TRACE_EVENT(scmi_fc_call,
 	TP_PROTO(u8 protocol_id, u8 msg_id, u32 res_id, u32 val1, u32 val2),
@@ -176,6 +177,51 @@ TRACE_EVENT(scmi_msg_dump,
 		  __entry->tag, __entry->msg_id, __entry->seq, __entry->status,
 		__print_hex_str(__get_dynamic_array(cmd), __entry->len))
 );
+
+TRACE_EVENT(scmi_tlm_access,
+	TP_PROTO(u64 de_id, unsigned char *tag, u64 startm, u64 endm),
+	TP_ARGS(de_id, tag, startm, endm),
+
+	TP_STRUCT__entry(
+		__field(u64, de_id)
+		__array(char, tag, TRACE_SCMI_TLM_MAX_TAG_LEN)
+		__field(u64, startm)
+		__field(u64, endm)
+	),
+
+	TP_fast_assign(
+		__entry->de_id = de_id;
+		strscpy(__entry->tag, tag, TRACE_SCMI_TLM_MAX_TAG_LEN);
+		__entry->startm = startm;
+		__entry->endm = endm;
+	),
+
+	TP_printk("de_id=0x%llX [%s] - startm=%016llX endm=%016llX",
+		  __entry->de_id, __entry->tag, __entry->startm, __entry->endm)
+);
+
+TRACE_EVENT(scmi_tlm_collect,
+	TP_PROTO(u64 ts, u64 de_id, u64 value, unsigned char *tag),
+	TP_ARGS(ts, de_id, value, tag),
+
+	TP_STRUCT__entry(
+		__field(u64, ts)
+		__field(u64, de_id)
+		__field(u64, value)
+		__array(char, tag, TRACE_SCMI_TLM_MAX_TAG_LEN)
+	),
+
+	TP_fast_assign(
+		__entry->ts = ts;
+		__entry->de_id = de_id;
+		__entry->value = value;
+		strscpy(__entry->tag, tag, TRACE_SCMI_TLM_MAX_TAG_LEN);
+	),
+
+	TP_printk("ts=%llu  de_id=0x%04llX  value=%016llu [%s]",
+		  __entry->ts, __entry->de_id, __entry->value, __entry->tag)
+);
+
 #endif /* _TRACE_SCMI_H */
 
 /* This part must be outside protection */
-- 
2.47.0