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https://github.com/edk2-porting/linux-next.git
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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
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <traceevent/event-parse.h>
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#include <api/fs/tracing_path.h>
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#include <api/fs/fs.h>
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#include "trace-event.h"
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#include "machine.h"
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#include "util.h"
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/*
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* global trace_event object used by trace_event__tp_format
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*
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* TODO There's no cleanup call for this. Add some sort of
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* __exit function support and call trace_event__cleanup
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* there.
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*/
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static struct trace_event tevent;
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static bool tevent_initialized;
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int trace_event__init(struct trace_event *t)
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{
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struct pevent *pevent = pevent_alloc();
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if (pevent) {
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t->plugin_list = traceevent_load_plugins(pevent);
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t->pevent = pevent;
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}
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return pevent ? 0 : -1;
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}
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static int trace_event__init2(void)
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{
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int be = traceevent_host_bigendian();
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struct pevent *pevent;
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if (trace_event__init(&tevent))
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return -1;
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pevent = tevent.pevent;
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pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
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pevent_set_file_bigendian(pevent, be);
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pevent_set_host_bigendian(pevent, be);
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tevent_initialized = true;
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return 0;
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}
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int trace_event__register_resolver(struct machine *machine,
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pevent_func_resolver_t *func)
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{
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if (!tevent_initialized && trace_event__init2())
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return -1;
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return pevent_set_function_resolver(tevent.pevent, func, machine);
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}
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void trace_event__cleanup(struct trace_event *t)
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{
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traceevent_unload_plugins(t->plugin_list, t->pevent);
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pevent_free(t->pevent);
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}
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/*
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* Returns pointer with encoded error via <linux/err.h> interface.
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*/
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static struct event_format*
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tp_format(const char *sys, const char *name)
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{
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struct pevent *pevent = tevent.pevent;
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struct event_format *event = NULL;
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char path[PATH_MAX];
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size_t size;
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char *data;
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int err;
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scnprintf(path, PATH_MAX, "%s/%s/%s/format",
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tracing_events_path, sys, name);
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err = filename__read_str(path, &data, &size);
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if (err)
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return ERR_PTR(err);
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pevent_parse_format(pevent, &event, data, size, sys);
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free(data);
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return event;
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}
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/*
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* Returns pointer with encoded error via <linux/err.h> interface.
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*/
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struct event_format*
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trace_event__tp_format(const char *sys, const char *name)
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{
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if (!tevent_initialized && trace_event__init2())
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return ERR_PTR(-ENOMEM);
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return tp_format(sys, name);
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}
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struct event_format *trace_event__tp_format_id(int id)
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{
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if (!tevent_initialized && trace_event__init2())
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return ERR_PTR(-ENOMEM);
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return pevent_find_event(tevent.pevent, id);
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}
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