perf tools: Add/use PMU reverse lookup from config to name
Add perf_pmu__name_from_config that does a reverse lookup from a config number to an alias name. The lookup is expensive as the config is computed for every alias by filling in a perf_event_attr, but this is only done when verbose output is enabled. The lookup also only considers config, and not config1, config2 or config3. An example of the output: $ perf stat -vv -e data_read true ... perf_event_attr: type 24 (uncore_imc_free_running_0) size 136 config 0x20ff (data_read) sample_type IDENTIFIER read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING disabled 1 inherit 1 exclude_guest 1 ... Committer notes: Fix the python binding build by adding dummies for not strictly needed perf_pmu__name_from_config() and perf_pmus__find_by_type(). Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Kan Liang <kan.liang@linux.intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Yang Jihong <yangjihong1@huawei.com> Link: https://lore.kernel.org/r/20240308001915.4060155-7-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -222,8 +222,14 @@ static void __p_config_tracepoint_id(char *buf, size_t size, u64 value)
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}
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#endif
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static void __p_config_id(char *buf, size_t size, u32 type, u64 value)
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static void __p_config_id(struct perf_pmu *pmu, char *buf, size_t size, u32 type, u64 value)
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{
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const char *name = perf_pmu__name_from_config(pmu, value);
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if (name) {
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print_id_hex(name);
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return;
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}
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switch (type) {
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case PERF_TYPE_HARDWARE:
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return __p_config_hw_id(buf, size, value);
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@ -252,7 +258,7 @@ static void __p_config_id(char *buf, size_t size, u32 type, u64 value)
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#define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
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#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
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#define p_type_id(val) __p_type_id(pmu, buf, BUF_SIZE, val)
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#define p_config_id(val) __p_config_id(buf, BUF_SIZE, attr->type, val)
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#define p_config_id(val) __p_config_id(pmu, buf, BUF_SIZE, attr->type, val)
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#define PRINT_ATTRn(_n, _f, _p, _a) \
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do { \
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@ -2146,3 +2146,21 @@ void perf_pmu__delete(struct perf_pmu *pmu)
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zfree(&pmu->id);
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free(pmu);
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}
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const char *perf_pmu__name_from_config(struct perf_pmu *pmu, u64 config)
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{
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struct perf_pmu_alias *event;
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if (!pmu)
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return NULL;
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pmu_add_cpu_aliases(pmu);
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list_for_each_entry(event, &pmu->aliases, list) {
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struct perf_event_attr attr = {.config = 0,};
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int ret = perf_pmu__config(pmu, &attr, &event->terms, NULL);
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if (ret == 0 && config == attr.config)
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return event->name;
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}
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return NULL;
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}
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@ -276,5 +276,6 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
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struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus);
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void perf_pmu__delete(struct perf_pmu *pmu);
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struct perf_pmu *perf_pmus__find_core_pmu(void);
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const char *perf_pmu__name_from_config(struct perf_pmu *pmu, u64 config);
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#endif /* __PMU_H */
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@ -103,6 +103,16 @@ int perf_pmu__scan_file(const struct perf_pmu *pmu, const char *name, const char
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return EOF;
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}
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const char *perf_pmu__name_from_config(struct perf_pmu *pmu __maybe_unused, u64 config __maybe_unused)
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{
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return NULL;
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}
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struct perf_pmu *perf_pmus__find_by_type(unsigned int type __maybe_unused)
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{
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return NULL;
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}
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int perf_pmus__num_core_pmus(void)
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{
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return 1;
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