From b30d4f0b695428f513c561eeaea52e042ef48550 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Tue, 27 Jun 2023 11:10:27 -0700
Subject: [PATCH] perf parse-events: Additional error reporting

When no events or PMUs match report an error for event_pmu:

Before:
```
$ perf stat -e 'asdfasdf' -a sleep 1
Run 'perf list' for a list of valid events

 Usage: perf stat [<options>] [<command>]

    -e, --event <event>   event selector. use 'perf list' to list available events
```

After:
```
$ perf stat -e 'asdfasdf' -a sleep 1
event syntax error: 'asdfasdf'
                     \___ Bad event name

Unabled to find PMU or event on a PMU of 'asdfasdf'
Run 'perf list' for a list of valid events

 Usage: perf stat [<options>] [<command>]

    -e, --event <event>   event selector. use 'perf list' to list available events
```

Fixes the inadvertent removal when hybrid parsing was modified.

Fixes: 70c90e4a6b2fbe77 ("perf parse-events: Avoid scanning PMUs before parsing")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230627181030.95608-11-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/parse-events.y | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index f090a85c4518..a636a7db6e6f 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -291,7 +291,6 @@ PE_NAME opt_pmu_config
 {
 	struct parse_events_state *parse_state = _parse_state;
 	struct list_head *list = NULL, *orig_terms = NULL, *terms= NULL;
-	struct parse_events_error *error = parse_state->error;
 	char *pattern = NULL;
 
 #define CLEANUP						\
@@ -303,9 +302,6 @@ PE_NAME opt_pmu_config
 		free(pattern);				\
 	} while(0)
 
-	if (error)
-		error->idx = @1.first_column;
-
 	if (parse_events_copy_term_list($2, &orig_terms)) {
 		CLEANUP;
 		YYNOMEM;
@@ -360,6 +356,14 @@ PE_NAME opt_pmu_config
 			$2 = NULL;
 		}
 		if (!ok) {
+			struct parse_events_error *error = parse_state->error;
+			char *help;
+
+			if (asprintf(&help, "Unabled to find PMU or event on a PMU of '%s'", $1) < 0)
+				help = NULL;
+			parse_events_error__handle(error, @1.first_column,
+						   strdup("Bad event or PMU"),
+						   help);
 			CLEANUP;
 			YYABORT;
 		}
@@ -376,9 +380,18 @@ PE_NAME sep_dc
 	int err;
 
 	err = parse_events_multi_pmu_add(_parse_state, $1, NULL, &list);
-	free($1);
-	if (err < 0)
+	if (err < 0) {
+		struct parse_events_state *parse_state = _parse_state;
+		struct parse_events_error *error = parse_state->error;
+		char *help;
+
+		if (asprintf(&help, "Unabled to find PMU or event on a PMU of '%s'", $1) < 0)
+			help = NULL;
+		parse_events_error__handle(error, @1.first_column, strdup("Bad event name"), help);
+		free($1);
 		PE_ABORT(err);
+	}
+	free($1);
 	$$ = list;
 }
 
-- 
2.20.1