linux-kernel - [PATCH v3 36/46] perf parse-events: Avoid error when assigning a term

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Date:   Fri, 28 Apr 2023 22:34:56 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ahmad Yasin <ahmad.yasin@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Samantha Alt <samantha.alt@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Weilin Wang <weilin.wang@...el.com>,
        Edward Baker <edward.baker@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fischer <florian.fischer@...q.space>,
        Rob Herring <robh@...nel.org>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Yang Jihong <yangjihong1@...wei.com>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Kang Minchul <tegongkang@...il.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ian Rogers <irogers@...gle.com>
Subject: [PATCH v3 36/46] perf parse-events: Avoid error when assigning a term

Avoid the parser error:
'''
$ perf stat -e 'cycles/name=name/' true
event syntax error: 'cycles/name=name/'
                                \___ parser error
'''
by turning the term back to a string if it is on the right. Add PMU
and generic parsing tests.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/parse-events.c | 21 +++++++++++++++++++++
 tools/perf/util/parse-events.c  |  9 +++++++++
 tools/perf/util/parse-events.h  |  3 +++
 tools/perf/util/parse-events.y  |  8 ++++++++
 4 files changed, 41 insertions(+)

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index 49166d51c0a1..449d7a1780f4 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -1485,6 +1485,16 @@ static int test__sym_event_dc(struct evlist *evlist)
 	return TEST_OK;
 }
 
+static int test__term_equal_term(struct evlist *evlist)
+{
+	struct evsel *evsel = evlist__first(evlist);
+
+	TEST_ASSERT_VAL("wrong type", evsel->core.attr.type == PERF_TYPE_HARDWARE);
+	TEST_ASSERT_VAL("wrong config", test_config(evsel, PERF_COUNT_HW_CPU_CYCLES));
+	TEST_ASSERT_VAL("wrong name setting", strcmp(evsel->name, "name") == 0);
+	return TEST_OK;
+}
+
 #ifdef HAVE_LIBTRACEEVENT
 static int count_tracepoints(void)
 {
@@ -1857,6 +1867,11 @@ static const struct evlist_test test__events[] = {
 		.check = test__exclusive_group,
 		/* 7 */
 	},
+	{
+		.name  = "cycles/name=name/",
+		.check = test__term_equal_term,
+		/* 8 */
+	},
 };
 
 static const struct evlist_test test__events_pmu[] = {
@@ -2038,6 +2053,12 @@ static const struct evlist_test test__events_pmu[] = {
 		.check = test__exclusive_group,
 		/* 9 */
 	},
+	{
+		.name  = "cpu/cycles,name=name/",
+		.valid = test__pmu_cpu_valid,
+		.check = test__term_equal_term,
+		/* 0 */
+	},
 };
 
 struct terms_test {
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index dea27bc0b376..5d5d77fa398b 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2581,6 +2581,15 @@ int parse_events_term__str(struct parse_events_term **term,
 	return new_term(term, &temp, str, 0);
 }
 
+int parse_events_term__term(struct parse_events_term **term,
+			    int term_lhs, int term_rhs,
+			    void *loc_term, void *loc_val)
+{
+	return parse_events_term__str(term, term_lhs, NULL,
+				      strdup(config_term_names[term_rhs]),
+				      loc_term, loc_val);
+}
+
 int parse_events_term__clone(struct parse_events_term **new,
 			     struct parse_events_term *term)
 {
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 7fe80b416143..2a8cafe0ee8f 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -148,6 +148,9 @@ int parse_events_term__num(struct parse_events_term **term,
 int parse_events_term__str(struct parse_events_term **term,
 			   int type_term, char *config, char *str,
 			   void *loc_term, void *loc_val);
+int parse_events_term__term(struct parse_events_term **term,
+			    int term_lhs, int term_rhs,
+			    void *loc_term, void *loc_val);
 int parse_events_term__clone(struct parse_events_term **new,
 			     struct parse_events_term *term);
 void parse_events_term__delete(struct parse_events_term *term);
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 819a5123fd77..0aaebc57748e 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -848,6 +848,14 @@ PE_TERM '=' PE_TERM_HW
 	$$ = term;
 }
 |
+PE_TERM '=' PE_TERM
+{
+	struct parse_events_term *term;
+
+	ABORT_ON(parse_events_term__term(&term, (int)$1, (int)$3, &@1, &@3));
+	$$ = term;
+}
+|
 PE_TERM '=' PE_VALUE
 {
 	struct parse_events_term *term;
-- 
2.40.1.495.gc816e09b53d-goog