diff options
-rw-r--r-- | tools/perf/util/pmu.c | 25 | ||||
-rw-r--r-- | tools/perf/util/pmu.h | 1 | ||||
-rw-r--r-- | tools/perf/util/pmus.c | 7 |
3 files changed, 32 insertions, 1 deletions
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 8d5ecd4ff1a9..7f984a7f16ca 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -928,6 +928,31 @@ err: return NULL; } +/* Creates the PMU when sysfs scanning fails. */ +struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus) +{ + struct perf_pmu *pmu = zalloc(sizeof(*pmu)); + + if (!pmu) + return NULL; + + pmu->name = strdup("cpu"); + if (!pmu->name) { + free(pmu); + return NULL; + } + + pmu->is_core = true; + pmu->type = PERF_TYPE_RAW; + pmu->cpus = cpu_map__online(); + + INIT_LIST_HEAD(&pmu->format); + INIT_LIST_HEAD(&pmu->aliases); + INIT_LIST_HEAD(&pmu->caps); + list_add_tail(&pmu->list, core_pmus); + return pmu; +} + void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu) { struct perf_pmu_format *format; diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 8807a624e918..203b92860e3c 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -286,6 +286,7 @@ int perf_pmu__event_source_devices_fd(void); int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags); struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name); +struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus); void perf_pmu__delete(struct perf_pmu *pmu); #endif /* __PMU_H */ diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c index 0866dee3fc62..3cd9de42139e 100644 --- a/tools/perf/util/pmus.c +++ b/tools/perf/util/pmus.c @@ -153,7 +153,12 @@ static void pmu_read_sysfs(bool core_only) closedir(dir); if (core_only) { - read_sysfs_core_pmus = true; + if (!list_empty(&core_pmus)) + read_sysfs_core_pmus = true; + else { + if (perf_pmu__create_placeholder_core_pmu(&core_pmus)) + read_sysfs_core_pmus = true; + } } else { read_sysfs_core_pmus = true; read_sysfs_all_pmus = true; |