From nobody Sun Sep 14 16:29:02 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 248ABC25B4E for ; Fri, 20 Jan 2023 14:39:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229730AbjATOj5 (ORCPT ); Fri, 20 Jan 2023 09:39:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229540AbjATOjz (ORCPT ); Fri, 20 Jan 2023 09:39:55 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 54BB072C36; Fri, 20 Jan 2023 06:39:16 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EDA7D1516; Fri, 20 Jan 2023 06:38:42 -0800 (PST) Received: from e126815.warwick.arm.com (e126815.arm.com [10.32.32.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 74A7A3F67D; Fri, 20 Jan 2023 06:37:58 -0800 (PST) From: James Clark To: linux-perf-users@vger.kernel.org, tanmay@marvell.com, leo.yan@linaro.org, mike.leach@linaro.org Cc: sgoutham@marvell.com, gcherian@marvell.com, lcherian@marvell.com, bbhushan2@marvell.com, James Clark , Mathieu Poirier , Suzuki K Poulose , John Garry , Will Deacon , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 2/8] perf: Use perf_pmu__open_file() and perf_pmu__scan_file() Date: Fri, 20 Jan 2023 14:36:55 +0000 Message-Id: <20230120143702.4035046-3-james.clark@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230120143702.4035046-1-james.clark@arm.com> References: <20230120143702.4035046-1-james.clark@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Remove some code that duplicates existing methods. Copy strings where const strings are required. No functional changes. Reviewed-by: Leo Yan Signed-off-by: James Clark --- tools/perf/util/cputopo.c | 9 +------- tools/perf/util/pmu-hybrid.c | 27 +++++------------------- tools/perf/util/pmu.c | 40 +++++++++++------------------------- tools/perf/util/pmu.h | 3 ++- 4 files changed, 20 insertions(+), 59 deletions(-) diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c index 1a3ff6449158..e08797c3cdbc 100644 --- a/tools/perf/util/cputopo.c +++ b/tools/perf/util/cputopo.c @@ -422,8 +422,6 @@ void numa_topology__delete(struct numa_topology *tp) static int load_hybrid_node(struct hybrid_topology_node *node, struct perf_pmu *pmu) { - const char *sysfs; - char path[PATH_MAX]; char *buf =3D NULL, *p; FILE *fp; size_t len =3D 0; @@ -432,12 +430,7 @@ static int load_hybrid_node(struct hybrid_topology_nod= e *node, if (!node->pmu_name) return -1; =20 - sysfs =3D sysfs__mountpoint(); - if (!sysfs) - goto err; - - snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, pmu->name); - fp =3D fopen(path, "r"); + fp =3D perf_pmu__open_file(pmu, "cpus"); if (!fp) goto err; =20 diff --git a/tools/perf/util/pmu-hybrid.c b/tools/perf/util/pmu-hybrid.c index f51ccaac60ee..38628805a952 100644 --- a/tools/perf/util/pmu-hybrid.c +++ b/tools/perf/util/pmu-hybrid.c @@ -20,32 +20,15 @@ LIST_HEAD(perf_pmu__hybrid_pmus); =20 bool perf_pmu__hybrid_mounted(const char *name) { - char path[PATH_MAX]; - const char *sysfs; - FILE *file; - int n, cpu; + int cpu; + char pmu_name[PATH_MAX]; + struct perf_pmu pmu =3D {.name =3D pmu_name}; =20 if (strncmp(name, "cpu_", 4)) return false; =20 - sysfs =3D sysfs__mountpoint(); - if (!sysfs) - return false; - - snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, name); - if (!file_available(path)) - return false; - - file =3D fopen(path, "r"); - if (!file) - return false; - - n =3D fscanf(file, "%u", &cpu); - fclose(file); - if (n <=3D 0) - return false; - - return true; + strlcpy(pmu_name, name, sizeof(pmu_name)); + return perf_pmu__scan_file(&pmu, "cpus", "%u", &cpu) > 0; } =20 struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name) diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 1edbb714ff32..a771a5972fc5 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -571,45 +571,31 @@ static void pmu_read_sysfs(void) closedir(dir); } =20 -static struct perf_cpu_map *__pmu_cpumask(const char *path) -{ - FILE *file; - struct perf_cpu_map *cpus; - - file =3D fopen(path, "r"); - if (!file) - return NULL; - - cpus =3D perf_cpu_map__read(file); - fclose(file); - return cpus; -} - /* * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/ar= m64) * may have a "cpus" file. */ #define SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier" -#define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask" =20 static struct perf_cpu_map *pmu_cpumask(const char *name) { - char path[PATH_MAX]; struct perf_cpu_map *cpus; - const char *sysfs =3D sysfs__mountpoint(); const char *templates[] =3D { - CPUS_TEMPLATE_UNCORE, - CPUS_TEMPLATE_CPU, + "cpumask", + "cpus", NULL }; const char **template; + char pmu_name[PATH_MAX]; + struct perf_pmu pmu =3D {.name =3D pmu_name}; + FILE *file; =20 - if (!sysfs) - return NULL; - + strlcpy(pmu_name, name, sizeof(pmu_name)); for (template =3D templates; *template; template++) { - snprintf(path, PATH_MAX, *template, sysfs, name); - cpus =3D __pmu_cpumask(path); + file =3D perf_pmu__open_file(&pmu, *template); + if (!file) + continue; + cpus =3D perf_cpu_map__read(file); if (cpus) return cpus; } @@ -620,13 +606,11 @@ static struct perf_cpu_map *pmu_cpumask(const char *n= ame) static bool pmu_is_uncore(const char *name) { char path[PATH_MAX]; - const char *sysfs; =20 if (perf_pmu__hybrid_mounted(name)) return false; =20 - sysfs =3D sysfs__mountpoint(); - snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name); + perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpumask"); return file_available(path); } =20 @@ -1737,7 +1721,7 @@ bool pmu_have_event(const char *pname, const char *na= me) return false; } =20 -static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name) +FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name) { char path[PATH_MAX]; =20 diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 96d030c8b3b3..742d4db319a0 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -7,6 +7,7 @@ #include #include #include +#include #include "parse-events.h" #include "pmu-events/pmu-events.h" =20 @@ -22,7 +23,6 @@ enum { }; =20 #define PERF_PMU_FORMAT_BITS 64 -#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus" #define MAX_PMU_NAME_LEN 128 =20 struct perf_event_attr; @@ -262,5 +262,6 @@ double perf_pmu__cpu_slots_per_cycle(void); int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size); int perf_pmu__pathname_scnprintf(char *buf, size_t size, const char *pmu_name, const char *filename); +FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name); =20 #endif /* __PMU_H */ --=20 2.25.1