mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 19:53:59 +08:00
71fe1052af
To get struct event_format object from tracepoint ID. It will be used in following patches. 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/1468148882-10362-3-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
|
|
#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 <linux/err.h>
|
|
#include <traceevent/event-parse.h>
|
|
#include <api/fs/tracing_path.h>
|
|
#include <api/fs/fs.h>
|
|
#include "trace-event.h"
|
|
#include "machine.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;
|
|
static bool tevent_initialized;
|
|
|
|
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;
|
|
}
|
|
|
|
static int trace_event__init2(void)
|
|
{
|
|
int be = traceevent_host_bigendian();
|
|
struct pevent *pevent;
|
|
|
|
if (trace_event__init(&tevent))
|
|
return -1;
|
|
|
|
pevent = tevent.pevent;
|
|
pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
|
|
pevent_set_file_bigendian(pevent, be);
|
|
pevent_set_host_bigendian(pevent, be);
|
|
tevent_initialized = true;
|
|
return 0;
|
|
}
|
|
|
|
int trace_event__register_resolver(struct machine *machine,
|
|
pevent_func_resolver_t *func)
|
|
{
|
|
if (!tevent_initialized && trace_event__init2())
|
|
return -1;
|
|
|
|
return pevent_set_function_resolver(tevent.pevent, func, machine);
|
|
}
|
|
|
|
void trace_event__cleanup(struct trace_event *t)
|
|
{
|
|
traceevent_unload_plugins(t->plugin_list, t->pevent);
|
|
pevent_free(t->pevent);
|
|
}
|
|
|
|
/*
|
|
* Returns pointer with encoded error via <linux/err.h> interface.
|
|
*/
|
|
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;
|
|
int err;
|
|
|
|
scnprintf(path, PATH_MAX, "%s/%s/%s/format",
|
|
tracing_events_path, sys, name);
|
|
|
|
err = filename__read_str(path, &data, &size);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
pevent_parse_format(pevent, &event, data, size, sys);
|
|
|
|
free(data);
|
|
return event;
|
|
}
|
|
|
|
/*
|
|
* Returns pointer with encoded error via <linux/err.h> interface.
|
|
*/
|
|
struct event_format*
|
|
trace_event__tp_format(const char *sys, const char *name)
|
|
{
|
|
if (!tevent_initialized && trace_event__init2())
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
return tp_format(sys, name);
|
|
}
|
|
|
|
struct event_format *trace_event__tp_format_id(int id)
|
|
{
|
|
if (!tevent_initialized && trace_event__init2())
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
return pevent_find_event(tevent.pevent, id);
|
|
}
|