perf stat: Warn group events from different hybrid PMU

If a group has events which are from different hybrid PMUs,
shows a warning:

"WARNING: events in group from different hybrid PMUs!"

This is to remind the user not to put the core event and atom
event into one group.

Next, just disable grouping.

  # perf stat -e "{cpu_core/cycles/,cpu_atom/cycles/}" -a -- sleep 1
  WARNING: events in group from different hybrid PMUs!
  WARNING: grouped events cpus do not match, disabling group:
    anon group { cpu_core/cycles/, cpu_atom/cycles/ }

   Performance counter stats for 'system wide':

           5,438,125      cpu_core/cycles/
           3,914,586      cpu_atom/cycles/

         1.004250966 seconds time elapsed

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/20210427070139.25256-17-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-stat.c

@@ -48,6 +48,7 @@
 #include "util/pmu.h"
 #include "util/event.h"
 #include "util/evlist.h"
+#include "util/evlist-hybrid.h"
 #include "util/evsel.h"
 #include "util/debug.h"
 #include "util/color.h"
@@ -243,6 +244,9 @@ static void evlist__check_cpu_maps(struct evlist *evlist)
 	struct evsel *evsel, *pos, *leader;
 	char buf[1024];
 
+	if (evlist__has_hybrid(evlist))
+		evlist__warn_hybrid_group(evlist);
+
 	evlist__for_each_entry(evlist, evsel) {
 		leader = evsel->leader;
 

tools/perf/util/evlist-hybrid.c

@@ -7,6 +7,7 @@
 #include "../perf.h"
 #include "util/pmu-hybrid.h"
 #include "util/evlist-hybrid.h"
+#include "debug.h"
 #include <unistd.h>
 #include <stdlib.h>
 #include <linux/err.h>
@@ -39,3 +40,49 @@ int evlist__add_default_hybrid(struct evlist *evlist, bool precise)
 
 	return 0;
 }
+
+static bool group_hybrid_conflict(struct evsel *leader)
+{
+	struct evsel *pos, *prev = NULL;
+
+	for_each_group_evsel(pos, leader) {
+		if (!evsel__is_hybrid(pos))
+			continue;
+
+		if (prev && strcmp(prev->pmu_name, pos->pmu_name))
+			return true;
+
+		prev = pos;
+	}
+
+	return false;
+}
+
+void evlist__warn_hybrid_group(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel__is_group_leader(evsel) &&
+		    evsel->core.nr_members > 1 &&
+		    group_hybrid_conflict(evsel)) {
+			pr_warning("WARNING: events in group from "
+				   "different hybrid PMUs!\n");
+			return;
+		}
+	}
+}
+
+bool evlist__has_hybrid(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel->pmu_name &&
+		    perf_pmu__is_hybrid(evsel->pmu_name)) {
+			return true;
+		}
+	}
+
+	return false;
+}

tools/perf/util/evlist-hybrid.h

@@ -8,5 +8,7 @@
 #include <unistd.h>
 
 int evlist__add_default_hybrid(struct evlist *evlist, bool precise);
+void evlist__warn_hybrid_group(struct evlist *evlist);
+bool evlist__has_hybrid(struct evlist *evlist);
 
 #endif /* __PERF_EVLIST_HYBRID_H */

tools/perf/util/evsel.c

@@ -47,6 +47,7 @@
 #include "memswap.h"
 #include "util.h"
 #include "hashmap.h"
+#include "pmu-hybrid.h"
 #include "../perf-sys.h"
 #include "util/parse-branch-options.h"
 #include <internal/xyarray.h>
@@ -2819,3 +2820,8 @@ void evsel__zero_per_pkg(struct evsel *evsel)
 		hashmap__clear(evsel->per_pkg_mask);
 	}
 }
+
+bool evsel__is_hybrid(struct evsel *evsel)
+{
+	return evsel->pmu_name && perf_pmu__is_hybrid(evsel->pmu_name);
+}

tools/perf/util/evsel.h

@@ -462,4 +462,5 @@ struct perf_env *evsel__env(struct evsel *evsel);
 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist);
 
 void evsel__zero_per_pkg(struct evsel *evsel);
+bool evsel__is_hybrid(struct evsel *evsel);
 #endif /* __PERF_EVSEL_H */

tools/perf/util/python-ext-sources

@@ -37,3 +37,5 @@ util/units.c
 util/affinity.c
 util/rwsem.c
 util/hashmap.c
+util/pmu-hybrid.c
+util/fncache.c