perf python: Add perf.tracepoint method

To get id of the tracepoint from subsystem and name strings. The
interface is:

  id = perf.tracepoint(sys, name)

In case of error -1 is returned.

It will be used to get python tracepoint event's config value for
tracepoint event.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1468148882-10362-7-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index fc277e4..45fdd4a 100644 (file)
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -2,6 +2,7 @@
 #include <structmember.h>
 #include <inttypes.h>
 #include <poll.h>
+#include <linux/err.h>
 #include "evlist.h"
 #include "evsel.h"
 #include "event.h"
@@ -1076,7 +1077,32 @@ static struct {
        { .name = NULL, },
 };
 
+static PyObject *pyrf__tracepoint(struct pyrf_evsel *pevsel,
+                                 PyObject *args, PyObject *kwargs)
+{
+       struct event_format *tp_format;
+       static char *kwlist[] = { "sys", "name", NULL };
+       char *sys  = NULL;
+       char *name = NULL;
+
+       if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ss", kwlist,
+                                        &sys, &name))
+               return NULL;
+
+       tp_format = trace_event__tp_format(sys, name);
+       if (IS_ERR(tp_format))
+               return PyInt_FromLong(-1);
+
+       return PyInt_FromLong(tp_format->id);
+}
+
 static PyMethodDef perf__methods[] = {
+       {
+               .ml_name  = "tracepoint",
+               .ml_meth  = (PyCFunction) pyrf__tracepoint,
+               .ml_flags = METH_VARARGS | METH_KEYWORDS,
+               .ml_doc   = PyDoc_STR("Get tracepoint config.")
+       },
        { .ml_name = NULL, }
 };