perf pmu: Recognize default_core as a core PMU in more places

The python metrics code used in places like ilist.py passes a
pmu-filter of "default_core" on non-hybrid x86/ARM/.. systems. As a
PMU like "cpu" isn't a literal name match then no PMU matches
"default_core" and the events fail to parse for the metric. Fix the
name matching and PMU lookup for "default_core" and check that it
fixes ilist.py.

Fixes: 74e2dbe7be ("perf tools: Add --pmu-filter option for filtering PMUs")
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed‑by: Qinxin Xia <xiaqinxin@huawei.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/util/pmu.c

@@ -2660,8 +2660,12 @@ bool perf_pmu__wildcard_match(const struct perf_pmu *pmu, const char *wildcard_t
 		pmu->name,
 		pmu->alias_name,
 	};
-	bool need_fnmatch = strisglob(wildcard_to_match);
+	bool need_fnmatch;
 
+	if (pmu->is_core && !strcmp(wildcard_to_match, "default_core"))
+		return true;
+
+	need_fnmatch = strisglob(wildcard_to_match);
 	if (!strncmp(wildcard_to_match, "uncore_", 7))
 		wildcard_to_match += 7;
 

tools/perf/util/pmus.c

@@ -150,6 +150,8 @@ struct perf_pmu *perf_pmus__find(const char *name)
 	bool core_pmu;
 	unsigned int to_read_pmus = 0;
 
+	if (!strcmp(name, "default_core"))
+		return perf_pmus__find_core_pmu();
 	/*
 	 * Once PMU is loaded it stays in the list,
 	 * so we keep us from multiple reading/parsing