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 perf_cpu_map__put(cpus); 130 if (err) { 131 if (err == -EACCES) 132 return TEST_SKIP; 133 134 pr_debug("Failed to open event cpu-clock:u\n"); 135 return err; 136 } 137 138 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 perf_cpu_map__put(cpus); 157 if (err == -EACCES) 158 return TEST_SKIP; 159 160 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_event(evlist, "cpu-clock:u"); 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 evlist__delete(evlist); 192 return err; 193 } 194 195 TEST_ASSERT_VAL("failed to attach", !err); 196 197 for (i = 0; i < 100000000; i++) { } 198 199 TEST_ASSERT_VAL("failed to detach", !detach(evlist)); 200 201 perf_evsel__read(&evsel->core, 0, 0, &count); 202 203 err = !(count.ena == count.run); 204 205 pr_debug(" %s: ena %" PRIu64", run %" PRIu64"\n", 206 !err ? "OK " : "FAILED", 207 count.ena, count.run); 208 209 out_err: 210 evlist__delete(evlist); 211 return !err ? TEST_OK : TEST_FAIL; 212 } 213 214 /* 215 * This test creates software event 'cpu-clock' 216 * attaches it in several ways (explained below) 217 * and checks that enabled and running times 218 * match. 219 */ 220 static int test__event_times(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 221 { 222 int err, ret = 0; 223 224 #define _T(attach, detach) \ 225 err = test_times(attach, detach); \ 226 if (err && (ret == TEST_OK || ret == TEST_SKIP)) \ 227 ret = err; 228 229 /* attach on newly spawned process after exec */ 230 _T(attach__enable_on_exec, detach__enable_on_exec) 231 /* attach on current process as enabled */ 232 _T(attach__current_enabled, detach__disable) 233 /* attach on current process as disabled */ 234 _T(attach__current_disabled, detach__disable) 235 /* attach on cpu as disabled */ 236 _T(attach__cpu_disabled, detach__disable) 237 /* attach on cpu as enabled */ 238 _T(attach__cpu_enabled, detach__disable) 239 240 #undef _T 241 return ret; 242 } 243 244 DEFINE_SUITE("Event times", event_times); 245