linux-kernel - [RFC PATCH v3 4/4] trace: Trace log handler for logging into STM blocks

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Date:	Tue,  7 Jul 2015 18:10:43 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	rostedt@...dmis.org, mingo@...hat.com
Cc:	mathieu.poirier@...aro.org, serge.broslavsky@...aro.org,
	broonie@...nel.org, alexander.shishkin@...ux.intel.com,
	zhang.lyra@...il.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v3 4/4] trace: Trace log handler for logging into STM blocks

Add the function 'trace_event_stm_output_##call' for printing events
trace log into STM blocks.

This patch also adds a function call at where the events have been
committed to ring buffer to export the trace event information to
STM blocks.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 include/linux/trace_events.h |  8 ++++++++
 include/trace/perf.h         |  3 +++
 include/trace/trace_events.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+)

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 28dcdff..705bd4e 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -418,6 +418,14 @@ enum event_trigger_type {
 
 #ifdef CONFIG_STM_TRACE_EVENT
 extern void stm_trace_event_write(const char *buf, unsigned len);
+extern void trace_event_stm_log(struct trace_event_buffer *buffer);
+extern void trace_event_buf_vprintf(struct trace_buffer_stm *tb,
+			    const char *fmt, ...) __attribute__ ((weak));
+#else
+static inline void trace_event_stm_log(struct trace_event_buffer *buffer) {}
+static inline void trace_event_buf_vprintf(struct trace_buffer_stm *tb,
+			    const char *fmt, ...) {}
+
 #endif
 
 extern int filter_match_preds(struct event_filter *filter, void *rec);
diff --git a/include/trace/perf.h b/include/trace/perf.h
index 1b5443c..79906de 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -175,6 +175,7 @@ trace_event_raw_event_##call(void *__data, proto)			\
 	{ assign; }							\
 									\
 	trace_event_buffer_commit(&fbuffer);				\
+	trace_event_stm_log(&fbuffer);					\
 }
 /*
  * The ftrace_test_probe is compiled out, it is only here as a build time check
@@ -234,6 +235,7 @@ static struct trace_event_call __used event_##call = {			\
 	.event.funcs		= &trace_event_type_funcs_##template,	\
 	.print_fmt		= print_fmt_##template,			\
 	.flags			= TRACE_EVENT_FL_TRACEPOINT,		\
+	.output_stm		= trace_event_stm_output_##template,	\
 };									\
 static struct trace_event_call __used					\
 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
@@ -251,6 +253,7 @@ static struct trace_event_call __used event_##call = {			\
 	.event.funcs		= &trace_event_type_funcs_##call,	\
 	.print_fmt		= print_fmt_##call,			\
 	.flags			= TRACE_EVENT_FL_TRACEPOINT,		\
+	.output_stm		= trace_event_stm_output_##call,	\
 };									\
 static struct trace_event_call __used					\
 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index 43be3b0..db4d8a7 100644
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -303,6 +303,50 @@ TRACE_MAKE_SYSTEM_STR();
 
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
+static notrace void							\
+trace_event_stm_output_##call(struct trace_seq *tmp_seq,		\
+			 void *entry,					\
+			 struct trace_buffer_stm *trace_buf)		\
+{									\
+	struct trace_event_raw_##call *field = entry;			\
+	struct trace_seq *p = tmp_seq;					\
+									\
+	trace_seq_init(p);						\
+									\
+	trace_event_buf_vprintf(trace_buf, print);			\
+									\
+	return;								\
+}
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
+static notrace void							\
+trace_event_stm_output_##call(struct trace_seq *tmp_seq,		\
+			 void *entry,					\
+			 struct trace_buffer_stm *trace_buf)		\
+{									\
+	struct trace_seq *p = tmp_seq;					\
+	struct trace_entry *ent = entry;				\
+	struct trace_event_raw_##template *field;				\
+									\
+	if (ent->type != event_##call.event.type) {			\
+		WARN_ON_ONCE(1);					\
+		return;							\
+	}								\
+									\
+	field = (typeof(field))entry;					\
+									\
+	trace_seq_init(p);						\
+									\
+	trace_event_buf_vprintf(trace_buf, print);			\
+									\
+	return;								\
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 static notrace enum print_line_t					\
 trace_raw_output_##call(struct trace_iterator *iter, int flags,		\
 			struct trace_event *trace_event)		\
-- 
1.9.1

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