1 // SPDX-License-Identifier: GPL-2.0
10 #include <linux/kernel.h>
11 #include <linux/err.h>
12 #include <traceevent/event-parse.h>
13 #include <api/fs/tracing_path.h>
14 #include <api/fs/fs.h>
15 #include "trace-event.h"
19 * global trace_event object used by trace_event__tp_format
21 * TODO There's no cleanup call for this. Add some sort of
22 * __exit function support and call trace_event__cleanup
25 static struct trace_event tevent;
26 static bool tevent_initialized;
28 int trace_event__init(struct trace_event *t)
30 struct tep_handle *pevent = tep_alloc();
33 t->plugin_list = tep_load_plugins(pevent);
37 return pevent ? 0 : -1;
40 static int trace_event__init2(void)
42 int be = tep_is_bigendian();
43 struct tep_handle *pevent;
45 if (trace_event__init(&tevent))
48 pevent = tevent.pevent;
49 tep_set_flag(pevent, TEP_NSEC_OUTPUT);
50 tep_set_file_bigendian(pevent, be);
51 tep_set_local_bigendian(pevent, be);
52 tevent_initialized = true;
56 int trace_event__register_resolver(struct machine *machine,
57 tep_func_resolver_t *func)
59 if (!tevent_initialized && trace_event__init2())
62 return tep_set_function_resolver(tevent.pevent, func, machine);
65 void trace_event__cleanup(struct trace_event *t)
67 tep_unload_plugins(t->plugin_list, t->pevent);
72 * Returns pointer with encoded error via <linux/err.h> interface.
74 static struct tep_event*
75 tp_format(const char *sys, const char *name)
77 char *tp_dir = get_events_file(sys);
78 struct tep_handle *pevent = tevent.pevent;
79 struct tep_event *event = NULL;
86 return ERR_PTR(-errno);
88 scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
89 put_events_file(tp_dir);
91 err = filename__read_str(path, &data, &size);
95 tep_parse_format(pevent, &event, data, size, sys);
102 * Returns pointer with encoded error via <linux/err.h> interface.
105 trace_event__tp_format(const char *sys, const char *name)
107 if (!tevent_initialized && trace_event__init2())
108 return ERR_PTR(-ENOMEM);
110 return tp_format(sys, name);
113 struct tep_event *trace_event__tp_format_id(int id)
115 if (!tevent_initialized && trace_event__init2())
116 return ERR_PTR(-ENOMEM);
118 return tep_find_event(tevent.pevent, id);