perf test: Add entry to test cpu topology

This patch test cpu core_id and socket_id which are stored in perf_env.

Commiter note:

  # perf test topo
  40: Test topology in session: Ok

  # perf test -v topo
  40: Test topology in session:
  --- start ---
  test child forked, pid 31767
  templ file: /tmp/perf-test-VTZ1PL
  CPU 0, core 0, socket 0
  CPU 1, core 1, socket 0
  CPU 2, core 0, socket 0
  CPU 3, core 1, socket 0
  test child finished with 0
  ---- end ----
  Test topology in session: Ok
  #

Based-on-a-patch-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/1441357111-64522-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/Build

@@ -33,6 +33,7 @@ perf-y += parse-no-sample-id-all.o
 perf-y += kmod-path.o
 perf-y += thread-map.o
 perf-y += llvm.o
+perf-y += topology.o
 
 perf-$(CONFIG_X86) += perf-time-to-tsc.o
 ifdef CONFIG_AUXTRACE

tools/perf/tests/builtin-test.c

@@ -186,6 +186,10 @@ static struct test {
 	},
 #endif
 #endif
+	{
+		.desc = "Test topology in session",
+		.func = test_session_topology,
+	},
 	{
 		.func = NULL,
 	},

tools/perf/tests/tests.h

@@ -64,6 +64,7 @@ int test__kmod_path__parse(void);
 int test__thread_map(void);
 int test__llvm(void);
 int test__insn_x86(void);
+int test_session_topology(void);
 
 #if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT

tools/perf/tests/topology.c

@@ -0,0 +1,115 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "tests.h"
+#include "util.h"
+#include "session.h"
+#include "evlist.h"
+#include "debug.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_file file = {
+		.path = path,
+		.mode = PERF_DATA_MODE_WRITE,
+	};
+
+	session = perf_session__new(&file, false, NULL);
+	TEST_ASSERT_VAL("can't get session", 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);
+
+	session->header.data_size += DATA_SIZE;
+
+	TEST_ASSERT_VAL("failed to write header",
+			!perf_session__write_header(session, session->evlist, file.fd, true));
+
+	perf_session__delete(session);
+
+	return 0;
+}
+
+static int check_cpu_topology(char *path, struct cpu_map *map)
+{
+	struct perf_session *session;
+	struct perf_data_file file = {
+		.path = path,
+		.mode = PERF_DATA_MODE_READ,
+	};
+	int i;
+
+	session = perf_session__new(&file, false, NULL);
+	TEST_ASSERT_VAL("can't get session", session);
+
+	for (i = 0; i < session->header.env.nr_cpus_online; i++) {
+		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) & 0xffff)));
+
+		TEST_ASSERT_VAL("Socket ID doesn't match",
+			(session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i)));
+	}
+
+	perf_session__delete(session);
+
+	return 0;
+}
+
+int test_session_topology(void)
+{
+	char path[PATH_MAX];
+	struct cpu_map *map;
+	int ret = -1;
+
+	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 = cpu_map__new(NULL);
+	if (map == NULL) {
+		pr_debug("failed to get system cpumap\n");
+		goto free_path;
+	}
+
+	if (check_cpu_topology(path, map))
+		goto free_map;
+	ret = 0;
+
+free_map:
+	cpu_map__put(map);
+free_path:
+	unlink(path);
+	return ret;
+}