1 files changed, 140 insertions, 0 deletions
diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c
new file mode 100644
index 000000000..f4a2c0df0
--- /dev/null
+++ b/tools/perf/tests/topology.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <perf/cpumap.h>
+#include "cpumap.h"
+#include "tests.h"
+#include "session.h"
+#include "evlist.h"
+#include "debug.h"
+#include <linux/err.h>
+
+#define TEMPL "/tmp/perf-test-XXXXXX"
+#define DATA_SIZE	10
+
+static int get_temp(char *path)
+{
+	int fd;
+
+	strcpy(path, TEMPL);
+
+	fd = mkstemp(path);
+	if (fd < 0) {
+		perror("mkstemp failed");
+		return -1;
+	}
+
+	close(fd);
+	return 0;
+}
+
+static int session_write_header(char *path)
+{
+	struct perf_session *session;
+	struct perf_data data = {
+		.path = path,
+		.mode = PERF_DATA_MODE_WRITE,
+	};
+
+	session = perf_session__new(&data, false, NULL);
+	TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
+
+	session->evlist = perf_evlist__new_default();
+	TEST_ASSERT_VAL("can't get evlist", session->evlist);
+
+	perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
+	perf_header__set_feat(&session->header, HEADER_NRCPUS);
+	perf_header__set_feat(&session->header, HEADER_ARCH);
+
+	session->header.data_size += DATA_SIZE;
+
+	TEST_ASSERT_VAL("failed to write header",
+			!perf_session__write_header(session, session->evlist, data.file.fd, true));
+
+	evlist__delete(session->evlist);
+	perf_session__delete(session);
+
+	return 0;
+}
+
+static int check_cpu_topology(char *path, struct perf_cpu_map *map)
+{
+	struct perf_session *session;
+	struct perf_data data = {
+		.path = path,
+		.mode = PERF_DATA_MODE_READ,
+	};
+	int i;
+
+	session = perf_session__new(&data, false, NULL);
+	TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
+
+	/* On platforms with large numbers of CPUs process_cpu_topology()
+	 * might issue an error while reading the perf.data file section
+	 * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
+	 * cpu is a NULL pointer.
+	 * Example: On s390
+	 *   CPU 0 is on core_id 0 and physical_package_id 6
+	 *   CPU 1 is on core_id 1 and physical_package_id 3
+	 *
+	 *   Core_id and physical_package_id are platform and architecture
+	 *   dependend and might have higher numbers than the CPU id.
+	 *   This actually depends on the configuration.
+	 *
+	 *  In this case process_cpu_topology() prints error message:
+	 *  "socket_id number is too big. You may need to upgrade the
+	 *  perf tool."
+	 *
+	 *  This is the reason why this test might be skipped.
+	 */
+	if (!session->header.env.cpu)
+		return TEST_SKIP;
+
+	for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
+		if (!cpu_map__has(map, i))
+			continue;
+		pr_debug("CPU %d, core %d, socket %d\n", i,
+			 session->header.env.cpu[i].core_id,
+			 session->header.env.cpu[i].socket_id);
+	}
+
+	for (i = 0; i < map->nr; i++) {
+		TEST_ASSERT_VAL("Core ID doesn't match",
+			(session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
+
+		TEST_ASSERT_VAL("Socket ID doesn't match",
+			(session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
+	}
+
+	perf_session__delete(session);
+
+	return 0;
+}
+
+int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+	char path[PATH_MAX];
+	struct perf_cpu_map *map;
+	int ret = TEST_FAIL;
+
+	TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
+
+	pr_debug("templ file: %s\n", path);
+
+	if (session_write_header(path))
+		goto free_path;
+
+	map = perf_cpu_map__new(NULL);
+	if (map == NULL) {
+		pr_debug("failed to get system cpumap\n");
+		goto free_path;
+	}
+
+	ret = check_cpu_topology(path, map);
+	perf_cpu_map__put(map);
+
+free_path:
+	unlink(path);
+	return ret;
+}