linux-kernel - [PATCH v4 5/7] include: trace: Add SCMI FastChannel tracing

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Date:   Mon,  4 Jul 2022 11:22:39 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        daniel.lezcano@...aro.org, tarek.el-sherbiny@....com,
        adrian.slatineanu@....com, souvik.chakravarty@....com,
        wleavitt@...vell.com, wbartczak@...vell.com,
        Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH v4 5/7] include: trace: Add SCMI FastChannel tracing

All the currently defined SCMI events are meant to trace only regular SCMI
transfers based on SCMI messages exchanges; SCMI transactions based on
FastChannels, where used, are completely invisible from the tracing point
of view.

Add support to trace FastChannel transactions; while doing that avoid
exposing full shared memory location addresses.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 include/trace/events/scmi.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/trace/events/scmi.h b/include/trace/events/scmi.h
index cee4b2b64ae4..fa8879568a37 100644
--- a/include/trace/events/scmi.h
+++ b/include/trace/events/scmi.h
@@ -7,6 +7,31 @@
 
 #include <linux/tracepoint.h>
 
+TRACE_EVENT(scmi_fc_call,
+	TP_PROTO(u8 protocol_id, u8 msg_id, u32 res_id, u32 val1, u32 val2),
+	TP_ARGS(protocol_id, msg_id, res_id, val1, val2),
+
+	TP_STRUCT__entry(
+		__field(u8, protocol_id)
+		__field(u8, msg_id)
+		__field(u32, res_id)
+		__field(u32, val1)
+		__field(u32, val2)
+	),
+
+	TP_fast_assign(
+		__entry->protocol_id = protocol_id;
+		__entry->msg_id = msg_id;
+		__entry->res_id = res_id;
+		__entry->val1 = val1;
+		__entry->val2 = val2;
+	),
+
+	TP_printk("[0x%02X]:[0x%02X]:[%08X]:%u:%u",
+		  __entry->protocol_id, __entry->msg_id,
+		  __entry->res_id, __entry->val1, __entry->val2)
+);
+
 TRACE_EVENT(scmi_xfer_begin,
 	TP_PROTO(int transfer_id, u8 msg_id, u8 protocol_id, u16 seq,
 		 bool poll),
-- 
2.32.0