linux-kernel - [RFC v3 2/3] interconnect: Add basic event tracing

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Date:   Fri,  8 Sep 2017 20:18:29 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     linux-pm@...r.kernel.org, gregkh@...uxfoundation.org
Cc:     rjw@...ysocki.net, robh+dt@...nel.org, khilman@...libre.com,
        mturquette@...libre.com, vincent.guittot@...aro.org,
        skannan@...eaurora.org, sboyd@...eaurora.org,
        andy.gross@...aro.org, seansw@....qualcomm.com,
        davidai@...cinc.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, georgi.djakov@...aro.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [RFC v3 2/3] interconnect: Add basic event tracing

Add basic tracepoints in interconnect_set() so we can trace the
performance and the operations which configure the hardware.

Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
---
 drivers/interconnect/interconnect.c |  7 ++++++
 include/trace/events/interconnect.h | 45 +++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 include/trace/events/interconnect.h

diff --git a/drivers/interconnect/interconnect.c b/drivers/interconnect/interconnect.c
index 94e2a9f01545..4a016f3bedc3 100644
--- a/drivers/interconnect/interconnect.c
+++ b/drivers/interconnect/interconnect.c
@@ -33,6 +33,9 @@ struct interconnect_path {
 	struct interconnect_req reqs[0];
 };
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/interconnect.h>
+
 static struct interconnect_node *node_find(const char *dev_id, int con_id)
 {
 	struct interconnect_node *node = ERR_PTR(-EPROBE_DEFER);
@@ -209,6 +212,8 @@ int interconnect_set(struct interconnect_path *path,
 	size_t i;
 	int ret = 0;
 
+	trace_interconnect_set(path);
+
 	for (i = 0; i < path->num_nodes; i++, prev = next) {
 		next = path->reqs[i].node;
 
@@ -242,6 +247,8 @@ int interconnect_set(struct interconnect_path *path,
 	}
 
 out:
+	trace_interconnect_set_complete(path);
+
 	return ret;
 }
 
diff --git a/include/trace/events/interconnect.h b/include/trace/events/interconnect.h
new file mode 100644
index 000000000000..c4a72163873c
--- /dev/null
+++ b/include/trace/events/interconnect.h
@@ -0,0 +1,45 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM interconnect
+
+#if !defined(_TRACE_INTERCONNECT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_INTERCONNECT_H
+
+#include <linux/tracepoint.h>
+
+struct interconnect_path;
+
+DECLARE_EVENT_CLASS(interconnect_path,
+
+	TP_PROTO(struct interconnect_path *path),
+
+	TP_ARGS(path),
+
+	TP_STRUCT__entry(
+		__field(struct interconnect_path *, path)
+	),
+
+	TP_fast_assign(
+		__entry->path = path;
+	),
+
+	TP_printk("INTERCONNECT: %p", __entry->path)
+);
+
+DEFINE_EVENT(interconnect_path, interconnect_set,
+
+	TP_PROTO(struct interconnect_path *path),
+
+	TP_ARGS(path)
+);
+
+DEFINE_EVENT(interconnect_path, interconnect_set_complete,
+
+	TP_PROTO(struct interconnect_path *path),
+
+	TP_ARGS(path)
+);
+
+#endif /* _TRACE_INTERCONNECT_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>