From a0c41caebab2fa224454d50dd4e29ae008ead25f Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Sat, 27 May 2023 00:21:43 -0700 Subject: [PATCH] perf pmu: Add CPU map for "cpu" PMUs A typical "cpu" PMU has no "cpus" or "cpumask" file meaning the CPU map is set to NULL, which also encodes an empty CPU map. Update pmu_cpumask so that if the "cpu" PMU fails to load a CPU map, use a default of all online PMUs. Remove const from cpu_map__online for the sake of reference counting. Reviewed-by: Kan Liang Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ali Saidi Cc: Athira Rajeev Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Huacai Chen Cc: Ingo Molnar Cc: James Clark Cc: Jing Zhang Cc: Jiri Olsa Cc: John Garry Cc: Kajol Jain Cc: Kang Minchul Cc: Leo Yan Cc: Madhavan Srinivasan Cc: Mark Rutland Cc: Mike Leach Cc: Ming Wang Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Rob Herring Cc: Sandipan Das Cc: Sean Christopherson Cc: Suzuki Poulouse Cc: Thomas Richter Cc: Will Deacon Cc: Xing Zhengjun Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20230527072210.2900565-8-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/cpumap.c | 4 ++-- tools/perf/util/cpumap.h | 4 ++-- tools/perf/util/pmu.c | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index a0719816a218..0e090e8bc334 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -667,9 +667,9 @@ size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size) return ptr - buf; } -const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ +struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ { - static const struct perf_cpu_map *online = NULL; + static struct perf_cpu_map *online; if (!online) online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h index f394ccc0ccfb..9df2aeb34d3d 100644 --- a/tools/perf/util/cpumap.h +++ b/tools/perf/util/cpumap.h @@ -55,7 +55,7 @@ struct perf_cpu_map *cpu_map__new_data(const struct perf_record_cpu_map_data *da size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size); size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size); size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp); -const struct perf_cpu_map *cpu_map__online(void); /* thread unsafe */ +struct perf_cpu_map *cpu_map__online(void); /* thread unsafe */ int cpu__setup_cpunode_map(void); @@ -66,7 +66,7 @@ struct perf_cpu cpu__max_present_cpu(void); /** * cpu_map__is_dummy - Events associated with a pid, rather than a CPU, use a single dummy map with an entry of -1. */ -static inline bool cpu_map__is_dummy(struct perf_cpu_map *cpus) +static inline bool cpu_map__is_dummy(const struct perf_cpu_map *cpus) { return perf_cpu_map__nr(cpus) == 1 && perf_cpu_map__cpu(cpus, 0).cpu == -1; } diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index e8c0762c311a..d992f5242d99 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -610,7 +610,7 @@ static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name) return cpus; } - return NULL; + return !strcmp(name, "cpu") ? perf_cpu_map__get(cpu_map__online()) : NULL; } static bool pmu_is_uncore(int dirfd, const char *name) -- 2.34.1