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Linux/tools/perf/util/trace-event.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 
  3 #include <stdio.h>
  4 #include <unistd.h>
  5 #include <stdlib.h>
  6 #include <errno.h>
  7 #include <sys/types.h>
  8 #include <sys/stat.h>
  9 #include <fcntl.h>
 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"
 16 #include "machine.h"
 17 #include "util.h"
 18 
 19 /*
 20  * global trace_event object used by trace_event__tp_format
 21  *
 22  * TODO There's no cleanup call for this. Add some sort of
 23  * __exit function support and call trace_event__cleanup
 24  * there.
 25  */
 26 static struct trace_event tevent;
 27 static bool tevent_initialized;
 28 
 29 int trace_event__init(struct trace_event *t)
 30 {
 31         struct pevent *pevent = pevent_alloc();
 32 
 33         if (pevent) {
 34                 t->plugin_list = traceevent_load_plugins(pevent);
 35                 t->pevent  = pevent;
 36         }
 37 
 38         return pevent ? 0 : -1;
 39 }
 40 
 41 static int trace_event__init2(void)
 42 {
 43         int be = traceevent_host_bigendian();
 44         struct pevent *pevent;
 45 
 46         if (trace_event__init(&tevent))
 47                 return -1;
 48 
 49         pevent = tevent.pevent;
 50         pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
 51         pevent_set_file_bigendian(pevent, be);
 52         pevent_set_host_bigendian(pevent, be);
 53         tevent_initialized = true;
 54         return 0;
 55 }
 56 
 57 int trace_event__register_resolver(struct machine *machine,
 58                                    pevent_func_resolver_t *func)
 59 {
 60         if (!tevent_initialized && trace_event__init2())
 61                 return -1;
 62 
 63         return pevent_set_function_resolver(tevent.pevent, func, machine);
 64 }
 65 
 66 void trace_event__cleanup(struct trace_event *t)
 67 {
 68         traceevent_unload_plugins(t->plugin_list, t->pevent);
 69         pevent_free(t->pevent);
 70 }
 71 
 72 /*
 73  * Returns pointer with encoded error via <linux/err.h> interface.
 74  */
 75 static struct event_format*
 76 tp_format(const char *sys, const char *name)
 77 {
 78         char *tp_dir = get_events_file(sys);
 79         struct pevent *pevent = tevent.pevent;
 80         struct event_format *event = NULL;
 81         char path[PATH_MAX];
 82         size_t size;
 83         char *data;
 84         int err;
 85 
 86         if (!tp_dir)
 87                 return ERR_PTR(-errno);
 88 
 89         scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
 90         put_events_file(tp_dir);
 91 
 92         err = filename__read_str(path, &data, &size);
 93         if (err)
 94                 return ERR_PTR(err);
 95 
 96         pevent_parse_format(pevent, &event, data, size, sys);
 97 
 98         free(data);
 99         return event;
100 }
101 
102 /*
103  * Returns pointer with encoded error via <linux/err.h> interface.
104  */
105 struct event_format*
106 trace_event__tp_format(const char *sys, const char *name)
107 {
108         if (!tevent_initialized && trace_event__init2())
109                 return ERR_PTR(-ENOMEM);
110 
111         return tp_format(sys, name);
112 }
113 
114 struct event_format *trace_event__tp_format_id(int id)
115 {
116         if (!tevent_initialized && trace_event__init2())
117                 return ERR_PTR(-ENOMEM);
118 
119         return pevent_find_event(tevent.pevent, id);
120 }
121 

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