1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/compiler.h> 3 #include <linux/string.h> 4 #include <errno.h> 5 #include <inttypes.h> 6 #include <string.h> 7 #include <sys/wait.h> 8 #include <perf/cpumap.h> 9 #include "tests.h" 10 #include "evlist.h" 11 #include "evsel.h" 12 #include "debug.h" 13 #include "parse-events.h" 14 #include "thread_map.h" 15 #include "target.h" 16 17 static int attach__enable_on_exec(struct evlist *evlist) 18 { 19 struct evsel *evsel = evlist__last(evlist); 20 struct target target = { 21 .uid = UINT_MAX, 22 }; 23 const char *argv[] = { "true", NULL, }; 24 char sbuf[STRERR_BUFSIZE]; 25 int err; 26 27 pr_debug("attaching to spawned child, enable on exec\n"); 28 29 err = evlist__create_maps(evlist, &target); 30 if (err < 0) { 31 pr_debug("Not enough memory to create thread/cpu maps\n"); 32 return err; 33 } 34 35 err = evlist__prepare_workload(evlist, &target, argv, false, NULL); 36 if (err < 0) { 37 pr_debug("Couldn't run the workload!\n"); 38 return err; 39 } 40 41 evsel->core.attr.enable_on_exec = 1; 42 43 err = evlist__open(evlist); 44 if (err < 0) { 45 pr_debug("perf_evlist__open: %s\n", 46 str_error_r(errno, sbuf, sizeof(sbuf))); 47 return err; 48 } 49 50 return evlist__start_workload(evlist) == 1 ? TEST_OK : TEST_FAIL; 51 } 52 53 static int detach__enable_on_exec(struct evlist *evlist) 54 { 55 waitpid(evlist->workload.pid, NULL, 0); 56 return 0; 57 } 58 59 static int attach__current_disabled(struct evlist *evlist) 60 { 61 struct evsel *evsel = evlist__last(evlist); 62 struct perf_thread_map *threads; 63 int err; 64 65 pr_debug("attaching to current thread as disabled\n"); 66 67 threads = thread_map__new(-1, getpid(), UINT_MAX); 68 if (threads == NULL) { 69 pr_debug("thread_map__new\n"); 70 return -1; 71 } 72 73 evsel->core.attr.disabled = 1; 74 75 err = evsel__open_per_thread(evsel, threads); 76 if (err) { 77 pr_debug("Failed to open event cpu-clock:u\n"); 78 return err; 79 } 80 81 perf_thread_map__put(threads); 82 return evsel__enable(evsel) == 0 ? TEST_OK : TEST_FAIL; 83 } 84 85 static int attach__current_enabled(struct evlist *evlist) 86 { 87 struct evsel *evsel = evlist__last(evlist); 88 struct perf_thread_map *threads; 89 int err; 90 91 pr_debug("attaching to current thread as enabled\n"); 92 93 threads = thread_map__new(-1, getpid(), UINT_MAX); 94 if (threads == NULL) { 95 pr_debug("failed to call thread_map__new\n"); 96 return -1; 97 } 98 99 err = evsel__open_per_thread(evsel, threads); 100 101 perf_thread_map__put(threads); 102 return err == 0 ? TEST_OK : TEST_FAIL; 103 } 104 105 static int detach__disable(struct evlist *evlist) 106 { 107 struct evsel *evsel = evlist__last(evlist); 108 109 return evsel__enable(evsel); 110 } 111 112 static int attach__cpu_disabled(struct evlist *evlist) 113 { 114 struct evsel *evsel = evlist__last(evlist); 115 struct perf_cpu_map *cpus; 116 int err; 117 118 pr_debug("attaching to CPU 0 as enabled\n"); 119 120 cpus = perf_cpu_map__new("0"); 121 if (cpus == NULL) { 122 pr_debug("failed to call perf_cpu_map__new\n"); 123 return -1; 124 } 125 126 evsel->core.attr.disabled = 1; 127 128 err = evsel__open_per_cpu(evsel, cpus, -1); 129 if (err) { 130 if (err == -EACCES) 131 return TEST_SKIP; 132 133 pr_debug("Failed to open event cpu-clock:u\n"); 134 return err; 135 } 136 137 perf_cpu_map__put(cpus); 138 return evsel__enable(evsel); 139 } 140 141 static int attach__cpu_enabled(struct evlist *evlist) 142 { 143 struct evsel *evsel = evlist__last(evlist); 144 struct perf_cpu_map *cpus; 145 int err; 146 147 pr_debug("attaching to CPU 0 as enabled\n"); 148 149 cpus = perf_cpu_map__new("0"); 150 if (cpus == NULL) { 151 pr_debug("failed to call perf_cpu_map__new\n"); 152 return -1; 153 } 154 155 err = evsel__open_per_cpu(evsel, cpus, -1); 156 if (err == -EACCES) 157 return TEST_SKIP; 158 159 perf_cpu_map__put(cpus); 160 return err ? TEST_FAIL : TEST_OK; 161 } 162 163 static int test_times(int (attach)(struct evlist *), 164 int (detach)(struct evlist *)) 165 { 166 struct perf_counts_values count; 167 struct evlist *evlist = NULL; 168 struct evsel *evsel; 169 int err = -1, i; 170 171 evlist = evlist__new(); 172 if (!evlist) { 173 pr_debug("failed to create event list\n"); 174 goto out_err; 175 } 176 177 err = parse_events(evlist, "cpu-clock:u", NULL); 178 if (err) { 179 pr_debug("failed to parse event cpu-clock:u\n"); 180 goto out_err; 181 } 182 183 evsel = evlist__last(evlist); 184 evsel->core.attr.read_format |= 185 PERF_FORMAT_TOTAL_TIME_ENABLED | 186 PERF_FORMAT_TOTAL_TIME_RUNNING; 187 188 err = attach(evlist); 189 if (err == TEST_SKIP) { 190 pr_debug(" SKIP : not enough rights\n"); 191 return err; 192 } 193 194 TEST_ASSERT_VAL("failed to attach", !err); 195 196 for (i = 0; i < 100000000; i++) { } 197 198 TEST_ASSERT_VAL("failed to detach", !detach(evlist)); 199 200 perf_evsel__read(&evsel->core, 0, 0, &count); 201 202 err = !(count.ena == count.run); 203 204 pr_debug(" %s: ena %" PRIu64", run %" PRIu64"\n", 205 !err ? "OK " : "FAILED", 206 count.ena, count.run); 207 208 out_err: 209 evlist__delete(evlist); 210 return !err ? TEST_OK : TEST_FAIL; 211 } 212 213 /* 214 * This test creates software event 'cpu-clock' 215 * attaches it in several ways (explained below) 216 * and checks that enabled and running times 217 * match. 218 */ 219 int test__event_times(struct test *test __maybe_unused, int subtest __maybe_unused) 220 { 221 int err, ret = 0; 222 223 #define _T(attach, detach) \ 224 err = test_times(attach, detach); \ 225 if (err && (ret == TEST_OK || ret == TEST_SKIP)) \ 226 ret = err; 227 228 /* attach on newly spawned process after exec */ 229 _T(attach__enable_on_exec, detach__enable_on_exec) 230 /* attach on current process as enabled */ 231 _T(attach__current_enabled, detach__disable) 232 /* attach on current process as disabled */ 233 _T(attach__current_disabled, detach__disable) 234 /* attach on cpu as disabled */ 235 _T(attach__cpu_disabled, detach__disable) 236 /* attach on cpu as enabled */ 237 _T(attach__cpu_enabled, detach__disable) 238 239 #undef _T 240 return ret; 241 } 242