perf tools: Fix term parsing for raw syntax

Jin Yao reported issue with possible conflict between raw events and
term values in pmu event syntax.

Currently following syntax is resolved as raw event with 0xead value:

  uncore_imc_free_running/read/

instead of using 'read' term from uncore_imc_free_running pmu, because
'read' is correct raw event syntax with 0xead value.

To solve this issue we do following:

  - check existing terms during rXXXX syntax processing
    and make them priority in case of conflict

  - allow pmu/r0x1234/ syntax to be able to specify conflicting
    raw event (implemented in previous patch)

Also add automated tests for this and perf_pmu__parse_cleanup call to
parse_events_terms, so the test gets properly cleaned up.

Fixes: 3a6c51e4d66c ("perf parser: Add support to specify rXXX event with pmu")
Reported-by: Jin Yao <yao.jin@linux.intel.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20200726075244.1191481-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index e88e4c7a2a9a..9f7260e69113 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2019,6 +2019,32 @@ err:
 	perf_pmu__parse_cleanup();
 }
 
+/*
+ * This function injects special term in
+ * perf_pmu_events_list so the test code
+ * can check on this functionality.
+ */
+int perf_pmu__test_parse_init(void)
+{
+	struct perf_pmu_event_symbol *list;
+
+	list = malloc(sizeof(*list) * 1);
+	if (!list)
+		return -ENOMEM;
+
+	list->type   = PMU_EVENT_SYMBOL;
+	list->symbol = strdup("read");
+
+	if (!list->symbol) {
+		free(list);
+		return -ENOMEM;
+	}
+
+	perf_pmu_events_list = list;
+	perf_pmu_events_list_num = 1;
+	return 0;
+}
+
 enum perf_pmu_event_symbol_type
 perf_pmu__parse_check(const char *name)
 {
@@ -2080,6 +2106,8 @@ int parse_events_terms(struct list_head *terms, const char *str)
 	int ret;
 
 	ret = parse_events__scanner(str, &parse_state);
+	perf_pmu__parse_cleanup();
+
 	if (!ret) {
 		list_splice(parse_state.terms, terms);
 		zfree(&parse_state.terms);