1 files changed, 126 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c
new file mode 100644
index 000000000..54810f9ac
--- /dev/null
+++ b/tools/perf/arch/x86/util/topdown.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include "api/fs/fs.h"
+#include "util/pmu.h"
+#include "util/topdown.h"
+#include "util/evlist.h"
+#include "util/debug.h"
+#include "util/pmu-hybrid.h"
+#include "topdown.h"
+#include "evsel.h"
+
+#define TOPDOWN_L1_EVENTS       "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
+#define TOPDOWN_L1_EVENTS_CORE  "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}"
+#define TOPDOWN_L2_EVENTS       "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
+#define TOPDOWN_L2_EVENTS_CORE  "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}"
+
+/* Check whether there is a PMU which supports the perf metrics. */
+bool topdown_sys_has_perf_metrics(void)
+{
+	static bool has_perf_metrics;
+	static bool cached;
+	struct perf_pmu *pmu;
+
+	if (cached)
+		return has_perf_metrics;
+
+	/*
+	 * The perf metrics feature is a core PMU feature.
+	 * The PERF_TYPE_RAW type is the type of a core PMU.
+	 * The slots event is only available when the core PMU
+	 * supports the perf metrics feature.
+	 */
+	pmu = perf_pmu__find_by_type(PERF_TYPE_RAW);
+	if (pmu && pmu_have_event(pmu->name, "slots"))
+		has_perf_metrics = true;
+
+	cached = true;
+	return has_perf_metrics;
+}
+
+/*
+ * Check whether we can use a group for top down.
+ * Without a group may get bad results due to multiplexing.
+ */
+bool arch_topdown_check_group(bool *warn)
+{
+	int n;
+
+	if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0)
+		return false;
+	if (n > 0) {
+		*warn = true;
+		return false;
+	}
+	return true;
+}
+
+void arch_topdown_group_warn(void)
+{
+	fprintf(stderr,
+		"nmi_watchdog enabled with topdown. May give wrong results.\n"
+		"Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n");
+}
+
+#define TOPDOWN_SLOTS		0x0400
+
+/*
+ * Check whether a topdown group supports sample-read.
+ *
+ * Only Topdown metric supports sample-read. The slots
+ * event must be the leader of the topdown group.
+ */
+
+bool arch_topdown_sample_read(struct evsel *leader)
+{
+	if (!evsel__sys_has_perf_metrics(leader))
+		return false;
+
+	if (leader->core.attr.config == TOPDOWN_SLOTS)
+		return true;
+
+	return false;
+}
+
+const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn)
+{
+	const char *pmu_name;
+
+	if (!perf_pmu__has_hybrid())
+		return "cpu";
+
+	if (!evlist->hybrid_pmu_name) {
+		if (warn)
+			pr_warning("WARNING: default to use cpu_core topdown events\n");
+		evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core");
+	}
+
+	pmu_name = evlist->hybrid_pmu_name;
+
+	return pmu_name;
+}
+
+int topdown_parse_events(struct evlist *evlist)
+{
+	const char *topdown_events;
+	const char *pmu_name;
+
+	if (!topdown_sys_has_perf_metrics())
+		return 0;
+
+	pmu_name = arch_get_topdown_pmu_name(evlist, false);
+
+	if (pmu_have_event(pmu_name, "topdown-heavy-ops")) {
+		if (!strcmp(pmu_name, "cpu_core"))
+			topdown_events = TOPDOWN_L2_EVENTS_CORE;
+		else
+			topdown_events = TOPDOWN_L2_EVENTS;
+	} else {
+		if (!strcmp(pmu_name, "cpu_core"))
+			topdown_events = TOPDOWN_L1_EVENTS_CORE;
+		else
+			topdown_events = TOPDOWN_L1_EVENTS;
+	}
+
+	return parse_event(evlist, topdown_events);
+}