[PATCH V6 13/14] perf, tools, stat: Check Topdown Metric group

[kan.liang@linux.intel.com]

From: Kan Liang <kan.liang@linux.intel.com>

The slots event is required in a Topdown Metric group.

Add a check to examine the Topdown Metric group. Error out if there is
no slots event detected.

Only check the group on the platform which using topdown_metric_attrs,
e.g. Ice Lake.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
 tools/perf/builtin-stat.c | 72 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 078ea1485317..9886aef78440 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1441,6 +1441,72 @@ static int topdown_filter_events(const char **attr, char **str, bool use_group)
 	return 0;
 }
 
+/* Event encoding for Topdown Metric events */
+#define TOPDOWN_SLOTS		0x0400
+#define TOPDOWN_RETIRE		0x1000
+#define TOPDOWN_BAD_SPEC	0x1100
+#define TOPDOWN_FE_BOUND	0x1200
+#define TOPDOWN_BE_BOUND	0x1300
+
+static bool is_topdown_metric_event(struct evsel *counter)
+{
+	if (!counter->pmu_name)
+		return false;
+
+	if (strcmp(counter->pmu_name, "cpu"))
+		return false;
+
+	if ((counter->core.attr.config == TOPDOWN_RETIRE) ||
+	    (counter->core.attr.config == TOPDOWN_BAD_SPEC) ||
+	    (counter->core.attr.config == TOPDOWN_FE_BOUND) ||
+	    (counter->core.attr.config == TOPDOWN_BE_BOUND))
+		return true;
+
+	return false;
+}
+
+static bool is_topdown_slots_event(struct evsel *counter)
+{
+	if (!counter->pmu_name)
+		return false;
+
+	if (strcmp(counter->pmu_name, "cpu"))
+		return false;
+
+	if (counter->core.attr.config == TOPDOWN_SLOTS)
+		return true;
+
+	return false;
+}
+
+static bool topdown_check_group_member(void)
+{
+	struct evsel *counter, *leader, *member;
+	bool has_slots;
+
+	if (!pmu_have_event("cpu", topdown_metric_attrs[0]))
+		return true;
+
+	evlist__for_each_entry(evsel_list, counter) {
+		if (!is_topdown_metric_event(counter))
+			continue;
+
+		leader = counter->leader;
+		has_slots = false;
+
+		for_each_group_evsel(member, leader) {
+			if (is_topdown_slots_event(member))
+				has_slots = true;
+			counter = member;
+		}
+
+		if (!has_slots)
+			return false;
+	}
+
+	return true;
+}
+
 __weak bool arch_topdown_check_group(bool *warn)
 {
 	*warn = false;
@@ -2024,6 +2090,12 @@ int cmd_stat(int argc, const char **argv)
 					(const char **) stat_usage,
 					PARSE_OPT_STOP_AT_NON_OPTION);
 	perf_stat__collect_metric_expr(evsel_list);
+
+	if (!topdown_check_group_member()) {
+		fprintf(stderr, "Topdown group must include slots event\n");
+		goto out;
+	}
+
 	perf_stat__init_shadow_stats();
 
 	if (stat_config.csv_sep) {
-- 
2.17.1