From: Jin Yao yao.jin@linux.intel.com
[ Upstream commit c47a5599eda324bacdacd125227a0925d6c50fbe ]
Some different PMU types may have the same substring. For example, on Icelake server we have PMU types "uncore_imc" and "uncore_imc_free_running". Both PMU types have the substring "uncore_imc". But the parser wrongly thinks they are the same PMU type.
We enable an imc event, perf stat -e uncore_imc/event=0xe3/ -a -- sleep 1
Perf actually expands the event to:
uncore_imc_0/event=0xe3/ uncore_imc_1/event=0xe3/ uncore_imc_2/event=0xe3/ uncore_imc_3/event=0xe3/ uncore_imc_4/event=0xe3/ uncore_imc_5/event=0xe3/ uncore_imc_6/event=0xe3/ uncore_imc_7/event=0xe3/ uncore_imc_free_running_0/event=0xe3/ uncore_imc_free_running_1/event=0xe3/ uncore_imc_free_running_3/event=0xe3/ uncore_imc_free_running_4/event=0xe3/
That's because the "uncore_imc_free_running" matches the pattern "uncore_imc*".
Now we check that the last characters of PMU name is '_<digit>'.
For example, for pattern "uncore_imc*", "uncore_imc_0" is parsed ok, but "uncore_imc_free_running_0" fails.
Fixes: b2b9d3a3f0211c5d ("perf pmu: Support wildcards on pmu name in dynamic pmu events") Signed-off-by: Jin Yao yao.jin@linux.intel.com Reviewed-by: Kan Liang kan.liang@linux.intel.com Acked-by: Jiri Olsa jolsa@redhat.com Cc: Agustin Vega-Frias agustinv@codeaurora.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andi Kleen ak@linux.intel.com Cc: Peter Zijlstra peterz@infradead.org Link: http://lore.kernel.org/lkml/20210701064253.1175-1-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/parse-events.y | 2 +- tools/perf/util/pmu.c | 36 +++++++++++++++++++++++++++++++++- tools/perf/util/pmu.h | 1 + 3 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index aba12a4d488e..9321bd0e2f76 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -316,7 +316,7 @@ event_pmu_name opt_pmu_config if (!strncmp(name, "uncore_", 7) && strncmp($1, "uncore_", 7)) name += 7; - if (!fnmatch(pattern, name, 0)) { + if (!perf_pmu__match(pattern, name, $1)) { if (parse_events_copy_term_list(orig_terms, &terms)) CLEANUP_YYABORT; if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true, false)) diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 88c8ecdc60b0..44b90d638ad5 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -3,6 +3,7 @@ #include <linux/compiler.h> #include <linux/string.h> #include <linux/zalloc.h> +#include <linux/ctype.h> #include <subcmd/pager.h> #include <sys/types.h> #include <errno.h> @@ -17,6 +18,7 @@ #include <locale.h> #include <regex.h> #include <perf/cpumap.h> +#include <fnmatch.h> #include "debug.h" #include "evsel.h" #include "pmu.h" @@ -740,6 +742,27 @@ struct pmu_events_map *__weak pmu_events_map__find(void) return perf_pmu__find_map(NULL); }
+static bool perf_pmu__valid_suffix(char *pmu_name, char *tok) +{ + char *p; + + if (strncmp(pmu_name, tok, strlen(tok))) + return false; + + p = pmu_name + strlen(tok); + if (*p == 0) + return true; + + if (*p != '_') + return false; + + ++p; + if (*p == 0 || !isdigit(*p)) + return false; + + return true; +} + bool pmu_uncore_alias_match(const char *pmu_name, const char *name) { char *tmp = NULL, *tok, *str; @@ -768,7 +791,7 @@ bool pmu_uncore_alias_match(const char *pmu_name, const char *name) */ for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) { name = strstr(name, tok); - if (!name) { + if (!name || !perf_pmu__valid_suffix((char *)name, tok)) { res = false; goto out; } @@ -1872,3 +1895,14 @@ bool perf_pmu__has_hybrid(void)
return !list_empty(&perf_pmu__hybrid_pmus); } + +int perf_pmu__match(char *pattern, char *name, char *tok) +{ + if (fnmatch(pattern, name, 0)) + return -1; + + if (tok && !perf_pmu__valid_suffix(name, tok)) + return -1; + + return 0; +} diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index a790ef758171..926da483a141 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -133,5 +133,6 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config, char *name);
bool perf_pmu__has_hybrid(void); +int perf_pmu__match(char *pattern, char *name, char *tok);
#endif /* __PMU_H */