perf trace: Postpone parsing .perfconfig trace.add_events to after --verbose is processed

When we add events via the '[trace]' section in perfconfig the command
line options are not yet processed, so when something goes wrong with
parsing those events and using --verbose is advised, we end up not
getting any more verbosity by doing so.

So just copy the trace.add_events string for later processing, after we
processed --verbose and the other command line options.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-d6wbnz85ftqljdll6ynjyjd8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 313dfc1..3d54316 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -162,6 +162,7 @@ struct trace {
        bool                    force;
        bool                    vfs_getname;
        int                     trace_pgfaults;
+       char                    *perfconfig_events;
        struct {
                struct ordered_events   data;
                u64                     last;
@@ -4044,15 +4045,11 @@ static int trace__config(const char *var, const char *value, void *arg)
        int err = 0;
 
        if (!strcmp(var, "trace.add_events")) {
-               struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
-                                              "event selector. use 'perf list' to list available events",
-                                              parse_events_option);
-               /*
-                * We can't propagate parse_event_option() return, as it is 1
-                * for failure while perf_config() expects -1.
-                */
-               if (parse_events_option(&o, value, 0))
-                       err = -1;
+               trace->perfconfig_events = strdup(value);
+               if (trace->perfconfig_events == NULL) {
+                       pr_err("Not enough memory for %s\n", "trace.add_events");
+                       return -1;
+               }
        } else if (!strcmp(var, "trace.show_timestamp")) {
                trace->show_tstamp = perf_config_bool(var, value);
        } else if (!strcmp(var, "trace.show_duration")) {
@@ -4224,6 +4221,21 @@ int cmd_trace(int argc, const char **argv)
 
        argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
                                 trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
+       /*
+        * Now that we have --verbose figured out, lets see if we need to parse
+        * events from .perfconfig, so that if those events fail parsing, say some
+        * BPF program fails, then we'll be able to use --verbose to see what went
+        * wrong in more detail.
+        */
+       if (trace.perfconfig_events != NULL) {
+               struct parse_events_error parse_err = { .idx = 0, };
+
+               err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err);
+               if (err) {
+                       parse_events_print_error(&parse_err, trace.perfconfig_events);
+                       goto out;
+               }
+       }
 
        if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
                usage_with_options_msg(trace_usage, trace_options,
@@ -4441,5 +4453,6 @@ out_close:
        if (output_name != NULL)
                fclose(trace.output);
 out:
+       zfree(&trace.perfconfig_events);
        return err;
 }