perf pmu: Add hybrid helper functions

The functions perf_pmu__is_hybrid and perf_pmu__find_hybrid_pmu
can be used to identify the hybrid platform and return the found
hybrid cpu pmu. All the detected hybrid pmus have been saved in
'perf_pmu__hybrid_pmus' list. So we just need to search this list.

perf_pmu__hybrid_type_to_pmu converts the user specified string
to hybrid pmu name. This is used to support the '--cputype' option
in next patches.

perf_pmu__has_hybrid checks the existing of hybrid pmu. Note that,
we have to define it in pmu.c (make pmu-hybrid.c no more symbol
dependency), otherwise perf test python would be failed.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210427070139.25256-7-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/pmu-hybrid.c b/tools/perf/util/pmu-hybrid.c
index 8ed0e6e..f51ccaa 100644 (file)
--- a/tools/perf/util/pmu-hybrid.c
+++ b/tools/perf/util/pmu-hybrid.c
@@ -47,3 +47,43 @@ bool perf_pmu__hybrid_mounted(const char *name)
 
        return true;
 }
+
+struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
+{
+       struct perf_pmu *pmu;
+
+       if (!name)
+               return NULL;
+
+       perf_pmu__for_each_hybrid_pmu(pmu) {
+               if (!strcmp(name, pmu->name))
+                       return pmu;
+       }
+
+       return NULL;
+}
+
+bool perf_pmu__is_hybrid(const char *name)
+{
+       return perf_pmu__find_hybrid_pmu(name) != NULL;
+}
+
+char *perf_pmu__hybrid_type_to_pmu(const char *type)
+{
+       char *pmu_name = NULL;
+
+       if (asprintf(&pmu_name, "cpu_%s", type) < 0)
+               return NULL;
+
+       if (perf_pmu__is_hybrid(pmu_name))
+               return pmu_name;
+
+       /*
+        * pmu may be not scanned, check the sysfs.
+        */
+       if (perf_pmu__hybrid_mounted(pmu_name))
+               return pmu_name;
+
+       free(pmu_name);
+       return NULL;
+}

diff --git a/tools/perf/util/pmu-hybrid.h b/tools/perf/util/pmu-hybrid.h
index 35bed37..d0fa7bc 100644 (file)
--- a/tools/perf/util/pmu-hybrid.h
+++ b/tools/perf/util/pmu-hybrid.h
@@ -15,4 +15,8 @@ extern struct list_head perf_pmu__hybrid_pmus;
 
 bool perf_pmu__hybrid_mounted(const char *name);
 
+struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name);
+bool perf_pmu__is_hybrid(const char *name);
+char *perf_pmu__hybrid_type_to_pmu(const char *type);
+
 #endif /* __PMU_HYBRID_H */

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 6e49c7b..88c8ecd 100644 (file)
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -40,6 +40,7 @@ int perf_pmu_parse(struct list_head *list, char *name);
 extern FILE *perf_pmu_in;
 
 static LIST_HEAD(pmus);
+static bool hybrid_scanned;
 
 /*
  * Parse & process all the sysfs attributes located under
@@ -1861,3 +1862,13 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
                   "'%llx' not supported by kernel)!\n",
                   name ?: "N/A", buf, config);
 }
+
+bool perf_pmu__has_hybrid(void)
+{
+       if (!hybrid_scanned) {
+               hybrid_scanned = true;
+               perf_pmu__scan(NULL);
+       }
+
+       return !list_empty(&perf_pmu__hybrid_pmus);
+}

diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 9a2f89e..a790ef7 100644 (file)
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -132,4 +132,6 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu);
 void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
                                   char *name);
 
+bool perf_pmu__has_hybrid(void);
+
 #endif /* __PMU_H */