linux-kernel - [PATCH v4 3/8] perf: Remove remaining duplication of bus/event

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Message-Id: <20230119154308.3815108-4-james.clark@arm.com>
Date:   Thu, 19 Jan 2023 15:43:02 +0000
From:   James Clark <james.clark@....com>
To:     linux-perf-users@...r.kernel.org, tanmay@...vell.com,
        leo.yan@...aro.org, mike.leach@...aro.org
Cc:     sgoutham@...vell.com, gcherian@...vell.com, lcherian@...vell.com,
        bbhushan2@...vell.com, James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/8] perf: Remove remaining duplication of bus/event_source/devices/...

Use the new perf_pmu__pathname_scnprintf() instead. No functional
changes.

Reviewed-by: Leo Yan <leo.yan@...aro.org>
Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/util/pmu.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 683cc7953f11..7a4e243a370d 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -574,8 +574,6 @@ static void pmu_read_sysfs(void)
  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
  * may have a "cpus" file.
  */
-#define SYS_TEMPLATE_ID	"./bus/event_source/devices/%s/identifier"
-
 static struct perf_cpu_map *pmu_cpumask(const char *name)
 {
 	struct perf_cpu_map *cpus;
@@ -618,9 +616,9 @@ static char *pmu_id(const char *name)
 	char path[PATH_MAX], *str;
 	size_t len;
 
-	snprintf(path, PATH_MAX, SYS_TEMPLATE_ID, name);
+	perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier");
 
-	if (sysfs__read_str(path, &str, &len) < 0)
+	if (filename__read_str(path, &str, &len) < 0)
 		return NULL;
 
 	str[len - 1] = 0; /* remove line feed */
@@ -866,16 +864,11 @@ pmu_find_alias_name(const char *name __maybe_unused)
 	return NULL;
 }
 
-static int pmu_max_precise(const char *name)
+static int pmu_max_precise(struct perf_pmu *pmu)
 {
-	char path[PATH_MAX];
 	int max_precise = -1;
 
-	scnprintf(path, PATH_MAX,
-		 "bus/event_source/devices/%s/caps/max_precise",
-		 name);
-
-	sysfs__read_int(path, &max_precise);
+	perf_pmu__scan_file(pmu, "caps/max_precise", "%d", &max_precise);
 	return max_precise;
 }
 
@@ -934,7 +927,7 @@ static struct perf_pmu *pmu_lookup(const char *lookup_name)
 	pmu->is_uncore = pmu_is_uncore(name);
 	if (pmu->is_uncore)
 		pmu->id = pmu_id(name);
-	pmu->max_precise = pmu_max_precise(name);
+	pmu->max_precise = pmu_max_precise(pmu);
 	pmu_add_cpu_aliases(&aliases, pmu);
 	pmu_add_sys_aliases(&aliases, pmu);
 
-- 
2.25.1