perf tools: Fix pattern matching for same substring in different PMU type

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>

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index aba12a4d488ef565458fd157471eeef594d513c2..9321bd0e2f76321a83496108c1e91aac53bfc983 100644 (file)
--- 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 88c8ecdc60b0ed8def3aab163827132690594f5f..44b90d638ad5f1a1d7d6411addb35c351a1bd63c 100644 (file)
--- 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 a790ef758171f549137d0058292103e3913f59ce..926da483a141cbb448f0ae7a41d083892e2950de 100644 (file)
--- 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 */