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Date: Sun, 14 Apr 2024 23:36:21 -0700
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Subject: [PATCH v1 4/9] perf pmu: Refactor perf_pmu__match
From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, 
	Arnaldo Carvalho de Melo <acme@kernel.org>, Namhyung Kim <namhyung@kernel.org>, 
	Mark Rutland <mark.rutland@arm.com>, 
	Alexander Shishkin <alexander.shishkin@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>, 
	Ian Rogers <irogers@google.com>, Adrian Hunter <adrian.hunter@intel.com>, 
	Kan Liang <kan.liang@linux.intel.com>, James Clark <james.clark@arm.com>, 
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, 
	bpf@vger.kernel.org, Atish Patra <atishp@rivosinc.com>, linux-riscv@lists.infradead.org, 
	Beeman Strong <beeman@rivosinc.com>
Content-Type: text/plain; charset="UTF-8"

Move all implementation to pmu code. Don't allocate a fnmatch wildcard
pattern, matching ignoring the suffix already handles this, and only
use fnmatch if the given PMU name has a '*' in it.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/parse-events.c | 19 ++-----------------
 tools/perf/util/pmu.c          | 27 +++++++++++++++++++--------
 tools/perf/util/pmu.h          |  2 +-
 3 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 7e23168deeb9..f4de374dab59 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1610,7 +1610,6 @@ int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state
 					struct list_head **listp,
 					void *loc_)
 {
-	char *pattern = NULL;
 	YYLTYPE *loc = loc_;
 	struct perf_pmu *pmu;
 	int ok = 0;
@@ -1630,22 +1629,9 @@ int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state
 
 	pmu = NULL;
 	/* Failed to add, try wildcard expansion of event_or_pmu as a PMU name. */
-	if (asprintf(&pattern, "%s*", event_or_pmu) < 0) {
-		zfree(listp);
-		return -ENOMEM;
-	}
-
 	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
-		const char *name = pmu->name;
-
-		if (parse_events__filter_pmu(parse_state, pmu))
-			continue;
-
-		if (!strncmp(name, "uncore_", 7) &&
-		    strncmp(event_or_pmu, "uncore_", 7))
-			name += 7;
-		if (!perf_pmu__match(pattern, name, event_or_pmu) ||
-		    !perf_pmu__match(pattern, pmu->alias_name, event_or_pmu)) {
+		if (!parse_events__filter_pmu(parse_state, pmu) &&
+		    perf_pmu__match(pmu, event_or_pmu)) {
 			bool auto_merge_stats = perf_pmu__auto_merge_stats(pmu);
 
 			if (!parse_events_add_pmu(parse_state, *listp, pmu, const_parsed_terms,
@@ -1655,7 +1641,6 @@ int parse_events_multi_pmu_add_or_add_pmu(struct parse_events_state *parse_state
 			}
 		}
 	}
-	zfree(&pattern);
 	if (ok)
 		return 0;
 
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index ce72c99e4f61..d7521d84fe4a 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -2073,18 +2073,29 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
 		   name ?: "N/A", buf, config_name, config);
 }
 
-int perf_pmu__match(const char *pattern, const char *name, const char *tok)
+bool perf_pmu__match(const struct perf_pmu *pmu, const char *tok)
 {
-	if (!name)
-		return -1;
+	const char *name = pmu->name;
+	bool need_fnmatch = strchr(tok, '*') != NULL;
 
-	if (fnmatch(pattern, name, 0))
-		return -1;
+	if (!strncmp(tok, "uncore_", 7))
+		tok += 7;
+	if (!strncmp(name, "uncore_", 7))
+		name += 7;
 
-	if (tok && !perf_pmu__match_ignoring_suffix(name, tok))
-		return -1;
+	if (perf_pmu__match_ignoring_suffix(name, tok) ||
+	    (need_fnmatch && !fnmatch(tok, name, 0)))
+		return true;
 
-	return 0;
+	name = pmu->alias_name;
+	if (!name)
+		return false;
+
+	if (!strncmp(name, "uncore_", 7))
+		name += 7;
+
+	return perf_pmu__match_ignoring_suffix(name, tok) ||
+		(need_fnmatch && !fnmatch(tok, name, 0));
 }
 
 double __weak perf_pmu__cpu_slots_per_cycle(void)
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 152700f78455..93d03bd3ecbe 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -263,7 +263,7 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
 				   const char *config_name);
 void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu);
 
-int perf_pmu__match(const char *pattern, const char *name, const char *tok);
+bool perf_pmu__match(const struct perf_pmu *pmu, const char *tok);
 
 double perf_pmu__cpu_slots_per_cycle(void);
 int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size);
-- 
2.44.0.683.g7961c838ac-goog