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 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 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 perf_session__delete(session); 56 57 return 0; 58 } 59 60 static int check_cpu_topology(char *path, struct perf_cpu_map *map) 61 { 62 struct perf_session *session; 63 struct perf_data data = { 64 .path = path, 65 .mode = PERF_DATA_MODE_READ, 66 }; 67 int i; 68 69 session = perf_session__new(&data, false, NULL); 70 TEST_ASSERT_VAL("can't get session", !IS_ERR(session)); 71 72 /* On platforms with large numbers of CPUs process_cpu_topology() 73 * might issue an error while reading the perf.data file section 74 * HEADER_CPU_TOPOLOGY and the cpu_topology_map pointed to by member 75 * cpu is a NULL pointer. 76 * Example: On s390 77 * CPU 0 is on core_id 0 and physical_package_id 6 78 * CPU 1 is on core_id 1 and physical_package_id 3 79 * 80 * Core_id and physical_package_id are platform and architecture 81 * dependend and might have higher numbers than the CPU id. 82 * This actually depends on the configuration. 83 * 84 * In this case process_cpu_topology() prints error message: 85 * "socket_id number is too big. You may need to upgrade the 86 * perf tool." 87 * 88 * This is the reason why this test might be skipped. 89 */ 90 if (!session->header.env.cpu) 91 return TEST_SKIP; 92 93 for (i = 0; i < session->header.env.nr_cpus_avail; i++) { 94 if (!cpu_map__has(map, i)) 95 continue; 96 pr_debug("CPU %d, core %d, socket %d\n", i, 97 session->header.env.cpu[i].core_id, 98 session->header.env.cpu[i].socket_id); 99 } 100 101 for (i = 0; i < map->nr; i++) { 102 TEST_ASSERT_VAL("Core ID doesn't match", 103 (session->header.env.cpu[map->map[i]].core_id == (cpu_map__get_core(map, i, NULL) & 0xffff))); 104 105 TEST_ASSERT_VAL("Socket ID doesn't match", 106 (session->header.env.cpu[map->map[i]].socket_id == cpu_map__get_socket(map, i, NULL))); 107 } 108 109 perf_session__delete(session); 110 111 return 0; 112 } 113 114 int test__session_topology(struct test *test __maybe_unused, int subtest __maybe_unused) 115 { 116 char path[PATH_MAX]; 117 struct perf_cpu_map *map; 118 int ret = TEST_FAIL; 119 120 TEST_ASSERT_VAL("can't get templ file", !get_temp(path)); 121 122 pr_debug("templ file: %s\n", path); 123 124 if (session_write_header(path)) 125 goto free_path; 126 127 map = perf_cpu_map__new(NULL); 128 if (map == NULL) { 129 pr_debug("failed to get system cpumap\n"); 130 goto free_path; 131 } 132 133 ret = check_cpu_topology(path, map); 134 perf_cpu_map__put(map); 135 136 free_path: 137 unlink(path); 138 return ret; 139 } 140