1 // SPDX-License-Identifier: GPL-2.0
2 #include <string.h>
3 #include <stdlib.h>
4 #include <stdio.h>
5 #include <perf/cpumap.h>
6 #include "cpumap.h"
7 #include "tests.h"
8 #include "session.h"
9 #include "evlist.h"
10 #include "debug.h"
11 #include <linux/err.h>
12
13 #define TEMPL "/tmp/perf-test-XXXXXX"
14 #define DATA_SIZE 10
15
get_temp(char * path)16 static int get_temp(char *path)
17 {
18 int fd;
19
20 strcpy(path, TEMPL);
21
22 fd = mkstemp(path);
23 if (fd < 0) {
24 perror("mkstemp failed");
25 return -1;
26 }
27
28 close(fd);
29 return 0;
30 }
31
session_write_header(char * path)32 static int session_write_header(char *path)
33 {
34 struct perf_session *session;
35 struct perf_data data = {
36 .path = path,
37 .mode = PERF_DATA_MODE_WRITE,
38 };
39
40 session = perf_session__new(&data, false, NULL);
41 TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
42
43 session->evlist = perf_evlist__new_default();
44 TEST_ASSERT_VAL("can't get evlist", session->evlist);
45
46 perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
47 perf_header__set_feat(&session->header, HEADER_NRCPUS);
48 perf_header__set_feat(&session->header, HEADER_ARCH);
49
50 session->header.data_size += DATA_SIZE;
51
52 TEST_ASSERT_VAL("failed to write header",
53 !perf_session__write_header(session, session->evlist, data.file.fd, true));
54
55 evlist__delete(session->evlist);
56 perf_session__delete(session);
57
58 return 0;
59 }
60
check_cpu_topology(char * path,struct perf_cpu_map * map)61 static int check_cpu_topology(char *path, struct perf_cpu_map *map)
62 {
63 struct perf_session *session;
64 struct perf_data data = {
65 .path = path,
66 .mode = PERF_DATA_MODE_READ,
67 };
68 int i;
69
70 session = perf_session__new(&data, false, NULL);
71 TEST_ASSERT_VAL("can't get session", !IS_ERR(session));
72
73 /* On platforms with large numbers of CPUs process_cpu_topology()
74 * might issue an error while reading the perf.data file section
75 * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member
76 * cpu is a NULL pointer.
77 * Example: On s390
78 * CPU 0 is on core_id 0 and physical_package_id 6
79 * CPU 1 is on core_id 1 and physical_package_id 3
80 *
81 * Core_id and physical_package_id are platform and architecture
82 * dependend and might have higher numbers than the CPU id.
83 * This actually depends on the configuration.
84 *
85 * In this case process_cpu_topology() prints error message:
86 * "socket_id number is too big. You may need to upgrade the
87 * perf tool."
88 *
89 * This is the reason why this test might be skipped.
90 */
91 if (!session->header.env.cpu)
92 return TEST_SKIP;
93
94 for (i = 0; i < session->header.env.nr_cpus_avail; i++) {
95 if (!cpu_map__has(map, i))
96 continue;
97 pr_debug("CPU %d, core %d, socket %d\n", i,
98 session->header.env.cpu[i].core_id,
99 session->header.env.cpu[i].socket_id);
100 }
101
102 for (i = 0; i < map->nr; i++) {
103 TEST_ASSERT_VAL("Core ID doesn't match",
104 (session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff)));
105
106 TEST_ASSERT_VAL("Socket ID doesn't match",
107 (session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL)));
108 }
109
110 perf_session__delete(session);
111
112 return 0;
113 }
114
test__session_topology(struct test * test __maybe_unused,int subtest __maybe_unused)115 int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused)
116 {
117 char path[PATH_MAX];
118 struct perf_cpu_map *map;
119 int ret = TEST_FAIL;
120
121 TEST_ASSERT_VAL("can't get templ file", !get_temp(path));
122
123 pr_debug("templ file: %s\n", path);
124
125 if (session_write_header(path))
126 goto free_path;
127
128 map = perf_cpu_map__new(NULL);
129 if (map == NULL) {
130 pr_debug("failed to get system cpumap\n");
131 goto free_path;
132 }
133
134 ret = check_cpu_topology(path, map);
135 perf_cpu_map__put(map);
136
137 free_path:
138 unlink(path);
139 return ret;
140 }
141