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Linux/tools/perf/tests/builtin-test.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * builtin-test.c
  4  *
  5  * Builtin regression testing command: ever growing number of sanity tests
  6  */
  7 #include <errno.h>
  8 #include <unistd.h>
  9 #include <string.h>
 10 #include <sys/types.h>
 11 #include <dirent.h>
 12 #include <sys/wait.h>
 13 #include <sys/stat.h>
 14 #include "builtin.h"
 15 #include "hist.h"
 16 #include "intlist.h"
 17 #include "tests.h"
 18 #include "debug.h"
 19 #include "color.h"
 20 #include <subcmd/parse-options.h>
 21 #include "string2.h"
 22 #include "symbol.h"
 23 #include <linux/kernel.h>
 24 #include <subcmd/exec-cmd.h>
 25 
 26 static bool dont_fork;
 27 
 28 struct test __weak arch_tests[] = {
 29         {
 30                 .func = NULL,
 31         },
 32 };
 33 
 34 static struct test generic_tests[] = {
 35         {
 36                 .desc = "vmlinux symtab matches kallsyms",
 37                 .func = test__vmlinux_matches_kallsyms,
 38         },
 39         {
 40                 .desc = "Detect openat syscall event",
 41                 .func = test__openat_syscall_event,
 42         },
 43         {
 44                 .desc = "Detect openat syscall event on all cpus",
 45                 .func = test__openat_syscall_event_on_all_cpus,
 46         },
 47         {
 48                 .desc = "Read samples using the mmap interface",
 49                 .func = test__basic_mmap,
 50         },
 51         {
 52                 .desc = "Test data source output",
 53                 .func = test__mem,
 54         },
 55         {
 56                 .desc = "Parse event definition strings",
 57                 .func = test__parse_events,
 58         },
 59         {
 60                 .desc = "Simple expression parser",
 61                 .func = test__expr,
 62         },
 63         {
 64                 .desc = "PERF_RECORD_* events & perf_sample fields",
 65                 .func = test__PERF_RECORD,
 66         },
 67         {
 68                 .desc = "Parse perf pmu format",
 69                 .func = test__pmu,
 70         },
 71         {
 72                 .desc = "DSO data read",
 73                 .func = test__dso_data,
 74         },
 75         {
 76                 .desc = "DSO data cache",
 77                 .func = test__dso_data_cache,
 78         },
 79         {
 80                 .desc = "DSO data reopen",
 81                 .func = test__dso_data_reopen,
 82         },
 83         {
 84                 .desc = "Roundtrip evsel->name",
 85                 .func = test__perf_evsel__roundtrip_name_test,
 86         },
 87         {
 88                 .desc = "Parse sched tracepoints fields",
 89                 .func = test__perf_evsel__tp_sched_test,
 90         },
 91         {
 92                 .desc = "syscalls:sys_enter_openat event fields",
 93                 .func = test__syscall_openat_tp_fields,
 94         },
 95         {
 96                 .desc = "Setup struct perf_event_attr",
 97                 .func = test__attr,
 98         },
 99         {
100                 .desc = "Match and link multiple hists",
101                 .func = test__hists_link,
102         },
103         {
104                 .desc = "'import perf' in python",
105                 .func = test__python_use,
106         },
107         {
108                 .desc = "Breakpoint overflow signal handler",
109                 .func = test__bp_signal,
110                 .is_supported = test__bp_signal_is_supported,
111         },
112         {
113                 .desc = "Breakpoint overflow sampling",
114                 .func = test__bp_signal_overflow,
115                 .is_supported = test__bp_signal_is_supported,
116         },
117         {
118                 .desc = "Number of exit events of a simple workload",
119                 .func = test__task_exit,
120         },
121         {
122                 .desc = "Software clock events period values",
123                 .func = test__sw_clock_freq,
124         },
125         {
126                 .desc = "Object code reading",
127                 .func = test__code_reading,
128         },
129         {
130                 .desc = "Sample parsing",
131                 .func = test__sample_parsing,
132         },
133         {
134                 .desc = "Use a dummy software event to keep tracking",
135                 .func = test__keep_tracking,
136         },
137         {
138                 .desc = "Parse with no sample_id_all bit set",
139                 .func = test__parse_no_sample_id_all,
140         },
141         {
142                 .desc = "Filter hist entries",
143                 .func = test__hists_filter,
144         },
145         {
146                 .desc = "Lookup mmap thread",
147                 .func = test__mmap_thread_lookup,
148         },
149         {
150                 .desc = "Share thread mg",
151                 .func = test__thread_mg_share,
152         },
153         {
154                 .desc = "Sort output of hist entries",
155                 .func = test__hists_output,
156         },
157         {
158                 .desc = "Cumulate child hist entries",
159                 .func = test__hists_cumulate,
160         },
161         {
162                 .desc = "Track with sched_switch",
163                 .func = test__switch_tracking,
164         },
165         {
166                 .desc = "Filter fds with revents mask in a fdarray",
167                 .func = test__fdarray__filter,
168         },
169         {
170                 .desc = "Add fd to a fdarray, making it autogrow",
171                 .func = test__fdarray__add,
172         },
173         {
174                 .desc = "kmod_path__parse",
175                 .func = test__kmod_path__parse,
176         },
177         {
178                 .desc = "Thread map",
179                 .func = test__thread_map,
180         },
181         {
182                 .desc = "LLVM search and compile",
183                 .func = test__llvm,
184                 .subtest = {
185                         .skip_if_fail   = true,
186                         .get_nr         = test__llvm_subtest_get_nr,
187                         .get_desc       = test__llvm_subtest_get_desc,
188                 },
189         },
190         {
191                 .desc = "Session topology",
192                 .func = test__session_topology,
193         },
194         {
195                 .desc = "BPF filter",
196                 .func = test__bpf,
197                 .subtest = {
198                         .skip_if_fail   = true,
199                         .get_nr         = test__bpf_subtest_get_nr,
200                         .get_desc       = test__bpf_subtest_get_desc,
201                 },
202         },
203         {
204                 .desc = "Synthesize thread map",
205                 .func = test__thread_map_synthesize,
206         },
207         {
208                 .desc = "Remove thread map",
209                 .func = test__thread_map_remove,
210         },
211         {
212                 .desc = "Synthesize cpu map",
213                 .func = test__cpu_map_synthesize,
214         },
215         {
216                 .desc = "Synthesize stat config",
217                 .func = test__synthesize_stat_config,
218         },
219         {
220                 .desc = "Synthesize stat",
221                 .func = test__synthesize_stat,
222         },
223         {
224                 .desc = "Synthesize stat round",
225                 .func = test__synthesize_stat_round,
226         },
227         {
228                 .desc = "Synthesize attr update",
229                 .func = test__event_update,
230         },
231         {
232                 .desc = "Event times",
233                 .func = test__event_times,
234         },
235         {
236                 .desc = "Read backward ring buffer",
237                 .func = test__backward_ring_buffer,
238         },
239         {
240                 .desc = "Print cpu map",
241                 .func = test__cpu_map_print,
242         },
243         {
244                 .desc = "Probe SDT events",
245                 .func = test__sdt_event,
246         },
247         {
248                 .desc = "is_printable_array",
249                 .func = test__is_printable_array,
250         },
251         {
252                 .desc = "Print bitmap",
253                 .func = test__bitmap_print,
254         },
255         {
256                 .desc = "perf hooks",
257                 .func = test__perf_hooks,
258         },
259         {
260                 .desc = "builtin clang support",
261                 .func = test__clang,
262                 .subtest = {
263                         .skip_if_fail   = true,
264                         .get_nr         = test__clang_subtest_get_nr,
265                         .get_desc       = test__clang_subtest_get_desc,
266                 }
267         },
268         {
269                 .desc = "unit_number__scnprintf",
270                 .func = test__unit_number__scnprint,
271         },
272         {
273                 .func = NULL,
274         },
275 };
276 
277 static struct test *tests[] = {
278         generic_tests,
279         arch_tests,
280 };
281 
282 static bool perf_test__matches(struct test *test, int curr, int argc, const char *argv[])
283 {
284         int i;
285 
286         if (argc == 0)
287                 return true;
288 
289         for (i = 0; i < argc; ++i) {
290                 char *end;
291                 long nr = strtoul(argv[i], &end, 10);
292 
293                 if (*end == '\0') {
294                         if (nr == curr + 1)
295                                 return true;
296                         continue;
297                 }
298 
299                 if (strcasestr(test->desc, argv[i]))
300                         return true;
301         }
302 
303         return false;
304 }
305 
306 static int run_test(struct test *test, int subtest)
307 {
308         int status, err = -1, child = dont_fork ? 0 : fork();
309         char sbuf[STRERR_BUFSIZE];
310 
311         if (child < 0) {
312                 pr_err("failed to fork test: %s\n",
313                         str_error_r(errno, sbuf, sizeof(sbuf)));
314                 return -1;
315         }
316 
317         if (!child) {
318                 if (!dont_fork) {
319                         pr_debug("test child forked, pid %d\n", getpid());
320 
321                         if (verbose <= 0) {
322                                 int nullfd = open("/dev/null", O_WRONLY);
323 
324                                 if (nullfd >= 0) {
325                                         close(STDERR_FILENO);
326                                         close(STDOUT_FILENO);
327 
328                                         dup2(nullfd, STDOUT_FILENO);
329                                         dup2(STDOUT_FILENO, STDERR_FILENO);
330                                         close(nullfd);
331                                 }
332                         } else {
333                                 signal(SIGSEGV, sighandler_dump_stack);
334                                 signal(SIGFPE, sighandler_dump_stack);
335                         }
336                 }
337 
338                 err = test->func(test, subtest);
339                 if (!dont_fork)
340                         exit(err);
341         }
342 
343         if (!dont_fork) {
344                 wait(&status);
345 
346                 if (WIFEXITED(status)) {
347                         err = (signed char)WEXITSTATUS(status);
348                         pr_debug("test child finished with %d\n", err);
349                 } else if (WIFSIGNALED(status)) {
350                         err = -1;
351                         pr_debug("test child interrupted\n");
352                 }
353         }
354 
355         return err;
356 }
357 
358 #define for_each_test(j, t)                                     \
359         for (j = 0; j < ARRAY_SIZE(tests); j++) \
360                 for (t = &tests[j][0]; t->func; t++)
361 
362 static int test_and_print(struct test *t, bool force_skip, int subtest)
363 {
364         int err;
365 
366         if (!force_skip) {
367                 pr_debug("\n--- start ---\n");
368                 err = run_test(t, subtest);
369                 pr_debug("---- end ----\n");
370         } else {
371                 pr_debug("\n--- force skipped ---\n");
372                 err = TEST_SKIP;
373         }
374 
375         if (!t->subtest.get_nr)
376                 pr_debug("%s:", t->desc);
377         else
378                 pr_debug("%s subtest %d:", t->desc, subtest);
379 
380         switch (err) {
381         case TEST_OK:
382                 pr_info(" Ok\n");
383                 break;
384         case TEST_SKIP:
385                 color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip\n");
386                 break;
387         case TEST_FAIL:
388         default:
389                 color_fprintf(stderr, PERF_COLOR_RED, " FAILED!\n");
390                 break;
391         }
392 
393         return err;
394 }
395 
396 static const char *shell_test__description(char *description, size_t size,
397                                            const char *path, const char *name)
398 {
399         FILE *fp;
400         char filename[PATH_MAX];
401 
402         path__join(filename, sizeof(filename), path, name);
403         fp = fopen(filename, "r");
404         if (!fp)
405                 return NULL;
406 
407         description = fgets(description, size, fp);
408         fclose(fp);
409 
410         return description ? trim(description + 1) : NULL;
411 }
412 
413 #define for_each_shell_test(dir, ent)           \
414         while ((ent = readdir(dir)) != NULL)    \
415                 if (ent->d_type == DT_REG && ent->d_name[0] != '.')
416 
417 static const char *shell_tests__dir(char *path, size_t size)
418 {
419         const char *devel_dirs[] = { "./tools/perf/tests", "./tests", };
420         char *exec_path;
421         unsigned int i;
422 
423         for (i = 0; i < ARRAY_SIZE(devel_dirs); ++i) {
424                 struct stat st;
425                 if (!lstat(devel_dirs[i], &st)) {
426                         scnprintf(path, size, "%s/shell", devel_dirs[i]);
427                         if (!lstat(devel_dirs[i], &st))
428                                 return path;
429                 }
430         }
431 
432         /* Then installed path. */
433         exec_path = get_argv_exec_path();
434         scnprintf(path, size, "%s/tests/shell", exec_path);
435         free(exec_path);
436         return path;
437 }
438 
439 static int shell_tests__max_desc_width(void)
440 {
441         DIR *dir;
442         struct dirent *ent;
443         char path_dir[PATH_MAX];
444         const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
445         int width = 0;
446 
447         if (path == NULL)
448                 return -1;
449 
450         dir = opendir(path);
451         if (!dir)
452                 return -1;
453 
454         for_each_shell_test(dir, ent) {
455                 char bf[256];
456                 const char *desc = shell_test__description(bf, sizeof(bf), path, ent->d_name);
457 
458                 if (desc) {
459                         int len = strlen(desc);
460 
461                         if (width < len)
462                                 width = len;
463                 }
464         }
465 
466         closedir(dir);
467         return width;
468 }
469 
470 struct shell_test {
471         const char *dir;
472         const char *file;
473 };
474 
475 static int shell_test__run(struct test *test, int subdir __maybe_unused)
476 {
477         int err;
478         char script[PATH_MAX];
479         struct shell_test *st = test->priv;
480 
481         path__join(script, sizeof(script), st->dir, st->file);
482 
483         err = system(script);
484         if (!err)
485                 return TEST_OK;
486 
487         return WEXITSTATUS(err) == 2 ? TEST_SKIP : TEST_FAIL;
488 }
489 
490 static int run_shell_tests(int argc, const char *argv[], int i, int width)
491 {
492         DIR *dir;
493         struct dirent *ent;
494         char path_dir[PATH_MAX];
495         struct shell_test st = {
496                 .dir = shell_tests__dir(path_dir, sizeof(path_dir)),
497         };
498 
499         if (st.dir == NULL)
500                 return -1;
501 
502         dir = opendir(st.dir);
503         if (!dir)
504                 return -1;
505 
506         for_each_shell_test(dir, ent) {
507                 int curr = i++;
508                 char desc[256];
509                 struct test test = {
510                         .desc = shell_test__description(desc, sizeof(desc), st.dir, ent->d_name),
511                         .func = shell_test__run,
512                         .priv = &st,
513                 };
514 
515                 if (!perf_test__matches(&test, curr, argc, argv))
516                         continue;
517 
518                 st.file = ent->d_name;
519                 pr_info("%2d: %-*s:", i, width, test.desc);
520                 test_and_print(&test, false, -1);
521         }
522 
523         closedir(dir);
524         return 0;
525 }
526 
527 static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
528 {
529         struct test *t;
530         unsigned int j;
531         int i = 0;
532         int width = shell_tests__max_desc_width();
533 
534         for_each_test(j, t) {
535                 int len = strlen(t->desc);
536 
537                 if (width < len)
538                         width = len;
539         }
540 
541         for_each_test(j, t) {
542                 int curr = i++, err;
543 
544                 if (!perf_test__matches(t, curr, argc, argv))
545                         continue;
546 
547                 if (t->is_supported && !t->is_supported()) {
548                         pr_debug("%2d: %-*s: Disabled\n", i, width, t->desc);
549                         continue;
550                 }
551 
552                 pr_info("%2d: %-*s:", i, width, t->desc);
553 
554                 if (intlist__find(skiplist, i)) {
555                         color_fprintf(stderr, PERF_COLOR_YELLOW, " Skip (user override)\n");
556                         continue;
557                 }
558 
559                 if (!t->subtest.get_nr) {
560                         test_and_print(t, false, -1);
561                 } else {
562                         int subn = t->subtest.get_nr();
563                         /*
564                          * minus 2 to align with normal testcases.
565                          * For subtest we print additional '.x' in number.
566                          * for example:
567                          *
568                          * 35: Test LLVM searching and compiling                        :
569                          * 35.1: Basic BPF llvm compiling test                          : Ok
570                          */
571                         int subw = width > 2 ? width - 2 : width;
572                         bool skip = false;
573                         int subi;
574 
575                         if (subn <= 0) {
576                                 color_fprintf(stderr, PERF_COLOR_YELLOW,
577                                               " Skip (not compiled in)\n");
578                                 continue;
579                         }
580                         pr_info("\n");
581 
582                         for (subi = 0; subi < subn; subi++) {
583                                 int len = strlen(t->subtest.get_desc(subi));
584 
585                                 if (subw < len)
586                                         subw = len;
587                         }
588 
589                         for (subi = 0; subi < subn; subi++) {
590                                 pr_info("%2d.%1d: %-*s:", i, subi + 1, subw,
591                                         t->subtest.get_desc(subi));
592                                 err = test_and_print(t, skip, subi);
593                                 if (err != TEST_OK && t->subtest.skip_if_fail)
594                                         skip = true;
595                         }
596                 }
597         }
598 
599         return run_shell_tests(argc, argv, i, width);
600 }
601 
602 static int perf_test__list_shell(int argc, const char **argv, int i)
603 {
604         DIR *dir;
605         struct dirent *ent;
606         char path_dir[PATH_MAX];
607         const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
608 
609         if (path == NULL)
610                 return -1;
611 
612         dir = opendir(path);
613         if (!dir)
614                 return -1;
615 
616         for_each_shell_test(dir, ent) {
617                 int curr = i++;
618                 char bf[256];
619                 struct test t = {
620                         .desc = shell_test__description(bf, sizeof(bf), path, ent->d_name),
621                 };
622 
623                 if (!perf_test__matches(&t, curr, argc, argv))
624                         continue;
625 
626                 pr_info("%2d: %s\n", i, t.desc);
627         }
628 
629         closedir(dir);
630         return 0;
631 }
632 
633 static int perf_test__list(int argc, const char **argv)
634 {
635         unsigned int j;
636         struct test *t;
637         int i = 0;
638 
639         for_each_test(j, t) {
640                 int curr = i++;
641 
642                 if (!perf_test__matches(t, curr, argc, argv) ||
643                     (t->is_supported && !t->is_supported()))
644                         continue;
645 
646                 pr_info("%2d: %s\n", i, t->desc);
647         }
648 
649         perf_test__list_shell(argc, argv, i);
650 
651         return 0;
652 }
653 
654 int cmd_test(int argc, const char **argv)
655 {
656         const char *test_usage[] = {
657         "perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
658         NULL,
659         };
660         const char *skip = NULL;
661         const struct option test_options[] = {
662         OPT_STRING('s', "skip", &skip, "tests", "tests to skip"),
663         OPT_INCR('v', "verbose", &verbose,
664                     "be more verbose (show symbol address, etc)"),
665         OPT_BOOLEAN('F', "dont-fork", &dont_fork,
666                     "Do not fork for testcase"),
667         OPT_END()
668         };
669         const char * const test_subcommands[] = { "list", NULL };
670         struct intlist *skiplist = NULL;
671         int ret = hists__init();
672 
673         if (ret < 0)
674                 return ret;
675 
676         argc = parse_options_subcommand(argc, argv, test_options, test_subcommands, test_usage, 0);
677         if (argc >= 1 && !strcmp(argv[0], "list"))
678                 return perf_test__list(argc - 1, argv + 1);
679 
680         symbol_conf.priv_size = sizeof(int);
681         symbol_conf.sort_by_name = true;
682         symbol_conf.try_vmlinux_path = true;
683 
684         if (symbol__init(NULL) < 0)
685                 return -1;
686 
687         if (skip != NULL)
688                 skiplist = intlist__new(skip);
689 
690         return __cmd_test(argc, argv, skiplist);
691 }
692 

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