1 files changed, 82 insertions, 0 deletions

diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c
new file mode 100644
index 000000000000..6322d37164c5
--- /dev/null
+++ b/tools/perf/util/trace-event.c
@@ -0,0 +1,82 @@
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/kernel.h>
+#include <traceevent/event-parse.h>
+#include "trace-event.h"
+#include "util.h"
+
+/*
+ * global trace_event object used by trace_event__tp_format
+ *
+ * TODO There's no cleanup call for this. Add some sort of
+ * __exit function support and call trace_event__cleanup
+ * there.
+ */
+static struct trace_event tevent;
+
+int trace_event__init(struct trace_event *t)
+{
+        struct pevent *pevent = pevent_alloc();
+
+        if (pevent) {
+                t->plugin_list = traceevent_load_plugins(pevent);
+                t->pevent  = pevent;
+        }
+
+        return pevent ? 0 : -1;
+}
+
+void trace_event__cleanup(struct trace_event *t)
+{
+        traceevent_unload_plugins(t->plugin_list, t->pevent);
+        pevent_free(t->pevent);
+}
+
+static struct event_format*
+tp_format(const char *sys, const char *name)
+{
+        struct pevent *pevent = tevent.pevent;
+        struct event_format *event = NULL;
+        char path[PATH_MAX];
+        size_t size;
+        char *data;
+
+        scnprintf(path, PATH_MAX, "%s/%s/%s/format",
+                  tracing_events_path, sys, name);
+
+        if (filename__read_str(path, &data, &size))
+                return NULL;
+
+        pevent_parse_format(pevent, &event, data, size, sys);
+
+        free(data);
+        return event;
+}
+
+struct event_format*
+trace_event__tp_format(const char *sys, const char *name)
+{
+        static bool initialized;
+
+        if (!initialized) {
+                int be = traceevent_host_bigendian();
+                struct pevent *pevent;
+
+                if (trace_event__init(&tevent))
+                        return NULL;
+
+                pevent = tevent.pevent;
+                pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
+                pevent_set_file_bigendian(pevent, be);
+                pevent_set_host_bigendian(pevent, be);
+                initialized = true;
+        }
+
+        return tp_format(sys, name);
+}