1 // SPDX-License-Identifier: GPL-2.0 2 #include <errno.h> 3 #include <inttypes.h> 4 #include <stdlib.h> 5 #include <perf/cpumap.h> 6 7 #include "debug.h" 8 #include "event.h" 9 #include "evlist.h" 10 #include "evsel.h" 11 #include "thread_map.h" 12 #include "tests.h" 13 #include "util/mmap.h" 14 #include "util/sample.h" 15 #include <linux/err.h> 16 #include <linux/kernel.h> 17 #include <linux/string.h> 18 #include <perf/evlist.h> 19 #include <perf/mmap.h> 20 21 /* 22 * This test will generate random numbers of calls to some getpid syscalls, 23 * then establish an mmap for a group of events that are created to monitor 24 * the syscalls. 25 * 26 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated 27 * sample.id field to map back to its respective perf_evsel instance. 28 * 29 * Then it checks if the number of syscalls reported as perf events by 30 * the kernel corresponds to the number of syscalls made. 31 */ 32 static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused) 33 { 34 int err = TEST_FAIL; 35 union perf_event *event; 36 struct perf_thread_map *threads; 37 struct perf_cpu_map *cpus; 38 struct evlist *evlist; 39 cpu_set_t cpu_set; 40 const char *syscall_names[] = { "getsid", "getppid", "getpgid", }; 41 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid }; 42 #define nsyscalls ARRAY_SIZE(syscall_names) 43 unsigned int nr_events[nsyscalls], 44 expected_nr_events[nsyscalls], i, j; 45 struct evsel *evsels[nsyscalls], *evsel; 46 char sbuf[STRERR_BUFSIZE]; 47 struct mmap *md; 48 49 threads = thread_map__new(-1, getpid(), UINT_MAX); 50 if (threads == NULL) { 51 pr_debug("thread_map__new\n"); 52 return -1; 53 } 54 55 cpus = perf_cpu_map__new(NULL); 56 if (cpus == NULL) { 57 pr_debug("perf_cpu_map__new\n"); 58 goto out_free_threads; 59 } 60 61 CPU_ZERO(&cpu_set); 62 CPU_SET(perf_cpu_map__cpu(cpus, 0).cpu, &cpu_set); 63 sched_setaffinity(0, sizeof(cpu_set), &cpu_set); 64 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) { 65 pr_debug("sched_setaffinity() failed on CPU %d: %s ", 66 perf_cpu_map__cpu(cpus, 0).cpu, 67 str_error_r(errno, sbuf, sizeof(sbuf))); 68 goto out_free_cpus; 69 } 70 71 evlist = evlist__new(); 72 if (evlist == NULL) { 73 pr_debug("evlist__new\n"); 74 goto out_free_cpus; 75 } 76 77 perf_evlist__set_maps(&evlist->core, cpus, threads); 78 79 for (i = 0; i < nsyscalls; ++i) { 80 char name[64]; 81 82 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]); 83 evsels[i] = evsel__newtp("syscalls", name); 84 if (IS_ERR(evsels[i])) { 85 pr_debug("evsel__new(%s)\n", name); 86 if (PTR_ERR(evsels[i]) == -EACCES) { 87 /* Permissions failure, flag the failure as a skip. */ 88 err = TEST_SKIP; 89 } 90 goto out_delete_evlist; 91 } 92 93 evsels[i]->core.attr.wakeup_events = 1; 94 evsel__set_sample_id(evsels[i], false); 95 96 evlist__add(evlist, evsels[i]); 97 98 if (evsel__open(evsels[i], cpus, threads) < 0) { 99 pr_debug("failed to open counter: %s, " 100 "tweak /proc/sys/kernel/perf_event_paranoid?\n", 101 str_error_r(errno, sbuf, sizeof(sbuf))); 102 goto out_delete_evlist; 103 } 104 105 nr_events[i] = 0; 106 expected_nr_events[i] = 1 + rand() % 127; 107 } 108 109 if (evlist__mmap(evlist, 128) < 0) { 110 pr_debug("failed to mmap events: %d (%s)\n", errno, 111 str_error_r(errno, sbuf, sizeof(sbuf))); 112 goto out_delete_evlist; 113 } 114 115 for (i = 0; i < nsyscalls; ++i) 116 for (j = 0; j < expected_nr_events[i]; ++j) { 117 syscalls[i](); 118 } 119 120 md = &evlist->mmap[0]; 121 if (perf_mmap__read_init(&md->core) < 0) 122 goto out_init; 123 124 while ((event = perf_mmap__read_event(&md->core)) != NULL) { 125 struct perf_sample sample; 126 127 if (event->header.type != PERF_RECORD_SAMPLE) { 128 pr_debug("unexpected %s event\n", 129 perf_event__name(event->header.type)); 130 goto out_delete_evlist; 131 } 132 133 err = evlist__parse_sample(evlist, event, &sample); 134 if (err) { 135 pr_err("Can't parse sample, err = %d\n", err); 136 goto out_delete_evlist; 137 } 138 139 err = -1; 140 evsel = evlist__id2evsel(evlist, sample.id); 141 if (evsel == NULL) { 142 pr_debug("event with id %" PRIu64 143 " doesn't map to an evsel\n", sample.id); 144 goto out_delete_evlist; 145 } 146 nr_events[evsel->core.idx]++; 147 perf_mmap__consume(&md->core); 148 } 149 perf_mmap__read_done(&md->core); 150 151 out_init: 152 err = 0; 153 evlist__for_each_entry(evlist, evsel) { 154 if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) { 155 pr_debug("expected %d %s events, got %d\n", 156 expected_nr_events[evsel->core.idx], 157 evsel__name(evsel), nr_events[evsel->core.idx]); 158 err = -1; 159 goto out_delete_evlist; 160 } 161 } 162 163 out_delete_evlist: 164 evlist__delete(evlist); 165 out_free_cpus: 166 perf_cpu_map__put(cpus); 167 out_free_threads: 168 perf_thread_map__put(threads); 169 return err; 170 } 171 172 static int test_stat_user_read(int event) 173 { 174 struct perf_counts_values counts = { .val = 0 }; 175 struct perf_thread_map *threads; 176 struct perf_evsel *evsel; 177 struct perf_event_mmap_page *pc; 178 struct perf_event_attr attr = { 179 .type = PERF_TYPE_HARDWARE, 180 .config = event, 181 #ifdef __aarch64__ 182 .config1 = 0x2, /* Request user access */ 183 #endif 184 }; 185 int err, i, ret = TEST_FAIL; 186 bool opened = false, mapped = false; 187 188 threads = perf_thread_map__new_dummy(); 189 TEST_ASSERT_VAL("failed to create threads", threads); 190 191 perf_thread_map__set_pid(threads, 0, 0); 192 193 evsel = perf_evsel__new(&attr); 194 TEST_ASSERT_VAL("failed to create evsel", evsel); 195 196 err = perf_evsel__open(evsel, NULL, threads); 197 if (err) { 198 pr_err("failed to open evsel: %s\n", strerror(-err)); 199 ret = TEST_SKIP; 200 goto out; 201 } 202 opened = true; 203 204 err = perf_evsel__mmap(evsel, 0); 205 if (err) { 206 pr_err("failed to mmap evsel: %s\n", strerror(-err)); 207 goto out; 208 } 209 mapped = true; 210 211 pc = perf_evsel__mmap_base(evsel, 0, 0); 212 if (!pc) { 213 pr_err("failed to get mmapped address\n"); 214 goto out; 215 } 216 217 if (!pc->cap_user_rdpmc || !pc->index) { 218 pr_err("userspace counter access not %s\n", 219 !pc->cap_user_rdpmc ? "supported" : "enabled"); 220 ret = TEST_SKIP; 221 goto out; 222 } 223 if (pc->pmc_width < 32) { 224 pr_err("userspace counter width not set (%d)\n", pc->pmc_width); 225 goto out; 226 } 227 228 perf_evsel__read(evsel, 0, 0, &counts); 229 if (counts.val == 0) { 230 pr_err("failed to read value for evsel\n"); 231 goto out; 232 } 233 234 for (i = 0; i < 5; i++) { 235 volatile int count = 0x10000 << i; 236 __u64 start, end, last = 0; 237 238 pr_debug("\tloop = %u, ", count); 239 240 perf_evsel__read(evsel, 0, 0, &counts); 241 start = counts.val; 242 243 while (count--) ; 244 245 perf_evsel__read(evsel, 0, 0, &counts); 246 end = counts.val; 247 248 if ((end - start) < last) { 249 pr_err("invalid counter data: end=%llu start=%llu last= %llu\n", 250 end, start, last); 251 goto out; 252 } 253 last = end - start; 254 pr_debug("count = %llu\n", end - start); 255 } 256 ret = TEST_OK; 257 258 out: 259 if (mapped) 260 perf_evsel__munmap(evsel); 261 if (opened) 262 perf_evsel__close(evsel); 263 perf_evsel__delete(evsel); 264 265 perf_thread_map__put(threads); 266 return ret; 267 } 268 269 static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused, 270 int subtest __maybe_unused) 271 { 272 return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS); 273 } 274 275 static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused, 276 int subtest __maybe_unused) 277 { 278 return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES); 279 } 280 281 static struct test_case tests__basic_mmap[] = { 282 TEST_CASE_REASON("Read samples using the mmap interface", 283 basic_mmap, 284 "permissions"), 285 TEST_CASE_REASON("User space counter reading of instructions", 286 mmap_user_read_instr, 287 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \ 288 (defined(__riscv) && __riscv_xlen == 64) 289 "permissions" 290 #else 291 "unsupported" 292 #endif 293 ), 294 TEST_CASE_REASON("User space counter reading of cycles", 295 mmap_user_read_cycles, 296 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \ 297 (defined(__riscv) && __riscv_xlen == 64) 298 "permissions" 299 #else 300 "unsupported" 301 #endif 302 ), 303 { .name = NULL, } 304 }; 305 306 struct test_suite suite__basic_mmap = { 307 .desc = "mmap interface tests", 308 .test_cases = tests__basic_mmap, 309 }; 310