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Subject[RFC v3 2/3] interconnect: Add basic event tracing
Date
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@linaro.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.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>
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