1 /*
2  * builtin-test.c
3  *
4  * Builtin regression testing command: ever growing number of sanity tests
5  */
6 #include "builtin.h"
7 
8 #include "util/cache.h"
9 #include "util/debug.h"
10 #include "util/debugfs.h"
11 #include "util/evlist.h"
12 #include "util/parse-options.h"
13 #include "util/parse-events.h"
14 #include "util/symbol.h"
15 #include "util/thread_map.h"
16 #include "../../include/linux/hw_breakpoint.h"
17 
vmlinux_matches_kallsyms_filter(struct map * map __used,struct symbol * sym)18 static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
19 {
20 	bool *visited = symbol__priv(sym);
21 	*visited = true;
22 	return 0;
23 }
24 
test__vmlinux_matches_kallsyms(void)25 static int test__vmlinux_matches_kallsyms(void)
26 {
27 	int err = -1;
28 	struct rb_node *nd;
29 	struct symbol *sym;
30 	struct map *kallsyms_map, *vmlinux_map;
31 	struct machine kallsyms, vmlinux;
32 	enum map_type type = MAP__FUNCTION;
33 	long page_size = sysconf(_SC_PAGE_SIZE);
34 	struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
35 
36 	/*
37 	 * Step 1:
38 	 *
39 	 * Init the machines that will hold kernel, modules obtained from
40 	 * both vmlinux + .ko files and from /proc/kallsyms split by modules.
41 	 */
42 	machine__init(&kallsyms, "", HOST_KERNEL_ID);
43 	machine__init(&vmlinux, "", HOST_KERNEL_ID);
44 
45 	/*
46 	 * Step 2:
47 	 *
48 	 * Create the kernel maps for kallsyms and the DSO where we will then
49 	 * load /proc/kallsyms. Also create the modules maps from /proc/modules
50 	 * and find the .ko files that match them in /lib/modules/`uname -r`/.
51 	 */
52 	if (machine__create_kernel_maps(&kallsyms) < 0) {
53 		pr_debug("machine__create_kernel_maps ");
54 		return -1;
55 	}
56 
57 	/*
58 	 * Step 3:
59 	 *
60 	 * Load and split /proc/kallsyms into multiple maps, one per module.
61 	 */
62 	if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
63 		pr_debug("dso__load_kallsyms ");
64 		goto out;
65 	}
66 
67 	/*
68 	 * Step 4:
69 	 *
70 	 * kallsyms will be internally on demand sorted by name so that we can
71 	 * find the reference relocation * symbol, i.e. the symbol we will use
72 	 * to see if the running kernel was relocated by checking if it has the
73 	 * same value in the vmlinux file we load.
74 	 */
75 	kallsyms_map = machine__kernel_map(&kallsyms, type);
76 
77 	sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
78 	if (sym == NULL) {
79 		pr_debug("dso__find_symbol_by_name ");
80 		goto out;
81 	}
82 
83 	ref_reloc_sym.addr = sym->start;
84 
85 	/*
86 	 * Step 5:
87 	 *
88 	 * Now repeat step 2, this time for the vmlinux file we'll auto-locate.
89 	 */
90 	if (machine__create_kernel_maps(&vmlinux) < 0) {
91 		pr_debug("machine__create_kernel_maps ");
92 		goto out;
93 	}
94 
95 	vmlinux_map = machine__kernel_map(&vmlinux, type);
96 	map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
97 
98 	/*
99 	 * Step 6:
100 	 *
101 	 * Locate a vmlinux file in the vmlinux path that has a buildid that
102 	 * matches the one of the running kernel.
103 	 *
104 	 * While doing that look if we find the ref reloc symbol, if we find it
105 	 * we'll have its ref_reloc_symbol.unrelocated_addr and then
106 	 * maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
107 	 * to fixup the symbols.
108 	 */
109 	if (machine__load_vmlinux_path(&vmlinux, type,
110 				       vmlinux_matches_kallsyms_filter) <= 0) {
111 		pr_debug("machine__load_vmlinux_path ");
112 		goto out;
113 	}
114 
115 	err = 0;
116 	/*
117 	 * Step 7:
118 	 *
119 	 * Now look at the symbols in the vmlinux DSO and check if we find all of them
120 	 * in the kallsyms dso. For the ones that are in both, check its names and
121 	 * end addresses too.
122 	 */
123 	for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
124 		struct symbol *pair, *first_pair;
125 		bool backwards = true;
126 
127 		sym  = rb_entry(nd, struct symbol, rb_node);
128 
129 		if (sym->start == sym->end)
130 			continue;
131 
132 		first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
133 		pair = first_pair;
134 
135 		if (pair && pair->start == sym->start) {
136 next_pair:
137 			if (strcmp(sym->name, pair->name) == 0) {
138 				/*
139 				 * kallsyms don't have the symbol end, so we
140 				 * set that by using the next symbol start - 1,
141 				 * in some cases we get this up to a page
142 				 * wrong, trace_kmalloc when I was developing
143 				 * this code was one such example, 2106 bytes
144 				 * off the real size. More than that and we
145 				 * _really_ have a problem.
146 				 */
147 				s64 skew = sym->end - pair->end;
148 				if (llabs(skew) < page_size)
149 					continue;
150 
151 				pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
152 					 sym->start, sym->name, sym->end, pair->end);
153 			} else {
154 				struct rb_node *nnd;
155 detour:
156 				nnd = backwards ? rb_prev(&pair->rb_node) :
157 						  rb_next(&pair->rb_node);
158 				if (nnd) {
159 					struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
160 
161 					if (next->start == sym->start) {
162 						pair = next;
163 						goto next_pair;
164 					}
165 				}
166 
167 				if (backwards) {
168 					backwards = false;
169 					pair = first_pair;
170 					goto detour;
171 				}
172 
173 				pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
174 					 sym->start, sym->name, pair->name);
175 			}
176 		} else
177 			pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
178 
179 		err = -1;
180 	}
181 
182 	if (!verbose)
183 		goto out;
184 
185 	pr_info("Maps only in vmlinux:\n");
186 
187 	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
188 		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
189 		/*
190 		 * If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
191 		 * the kernel will have the path for the vmlinux file being used,
192 		 * so use the short name, less descriptive but the same ("[kernel]" in
193 		 * both cases.
194 		 */
195 		pair = map_groups__find_by_name(&kallsyms.kmaps, type,
196 						(pos->dso->kernel ?
197 							pos->dso->short_name :
198 							pos->dso->name));
199 		if (pair)
200 			pair->priv = 1;
201 		else
202 			map__fprintf(pos, stderr);
203 	}
204 
205 	pr_info("Maps in vmlinux with a different name in kallsyms:\n");
206 
207 	for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
208 		struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
209 
210 		pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
211 		if (pair == NULL || pair->priv)
212 			continue;
213 
214 		if (pair->start == pos->start) {
215 			pair->priv = 1;
216 			pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
217 				pos->start, pos->end, pos->pgoff, pos->dso->name);
218 			if (pos->pgoff != pair->pgoff || pos->end != pair->end)
219 				pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
220 					pair->start, pair->end, pair->pgoff);
221 			pr_info(" %s\n", pair->dso->name);
222 			pair->priv = 1;
223 		}
224 	}
225 
226 	pr_info("Maps only in kallsyms:\n");
227 
228 	for (nd = rb_first(&kallsyms.kmaps.maps[type]);
229 	     nd; nd = rb_next(nd)) {
230 		struct map *pos = rb_entry(nd, struct map, rb_node);
231 
232 		if (!pos->priv)
233 			map__fprintf(pos, stderr);
234 	}
235 out:
236 	return err;
237 }
238 
239 #include "util/cpumap.h"
240 #include "util/evsel.h"
241 #include <sys/types.h>
242 
trace_event__id(const char * evname)243 static int trace_event__id(const char *evname)
244 {
245 	char *filename;
246 	int err = -1, fd;
247 
248 	if (asprintf(&filename,
249 		     "%s/syscalls/%s/id",
250 		     tracing_events_path, evname) < 0)
251 		return -1;
252 
253 	fd = open(filename, O_RDONLY);
254 	if (fd >= 0) {
255 		char id[16];
256 		if (read(fd, id, sizeof(id)) > 0)
257 			err = atoi(id);
258 		close(fd);
259 	}
260 
261 	free(filename);
262 	return err;
263 }
264 
test__open_syscall_event(void)265 static int test__open_syscall_event(void)
266 {
267 	int err = -1, fd;
268 	struct thread_map *threads;
269 	struct perf_evsel *evsel;
270 	struct perf_event_attr attr;
271 	unsigned int nr_open_calls = 111, i;
272 	int id = trace_event__id("sys_enter_open");
273 
274 	if (id < 0) {
275 		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
276 		return -1;
277 	}
278 
279 	threads = thread_map__new(-1, getpid());
280 	if (threads == NULL) {
281 		pr_debug("thread_map__new\n");
282 		return -1;
283 	}
284 
285 	memset(&attr, 0, sizeof(attr));
286 	attr.type = PERF_TYPE_TRACEPOINT;
287 	attr.config = id;
288 	evsel = perf_evsel__new(&attr, 0);
289 	if (evsel == NULL) {
290 		pr_debug("perf_evsel__new\n");
291 		goto out_thread_map_delete;
292 	}
293 
294 	if (perf_evsel__open_per_thread(evsel, threads, false, NULL) < 0) {
295 		pr_debug("failed to open counter: %s, "
296 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
297 			 strerror(errno));
298 		goto out_evsel_delete;
299 	}
300 
301 	for (i = 0; i < nr_open_calls; ++i) {
302 		fd = open("/etc/passwd", O_RDONLY);
303 		close(fd);
304 	}
305 
306 	if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
307 		pr_debug("perf_evsel__read_on_cpu\n");
308 		goto out_close_fd;
309 	}
310 
311 	if (evsel->counts->cpu[0].val != nr_open_calls) {
312 		pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
313 			 nr_open_calls, evsel->counts->cpu[0].val);
314 		goto out_close_fd;
315 	}
316 
317 	err = 0;
318 out_close_fd:
319 	perf_evsel__close_fd(evsel, 1, threads->nr);
320 out_evsel_delete:
321 	perf_evsel__delete(evsel);
322 out_thread_map_delete:
323 	thread_map__delete(threads);
324 	return err;
325 }
326 
327 #include <sched.h>
328 
test__open_syscall_event_on_all_cpus(void)329 static int test__open_syscall_event_on_all_cpus(void)
330 {
331 	int err = -1, fd, cpu;
332 	struct thread_map *threads;
333 	struct cpu_map *cpus;
334 	struct perf_evsel *evsel;
335 	struct perf_event_attr attr;
336 	unsigned int nr_open_calls = 111, i;
337 	cpu_set_t cpu_set;
338 	int id = trace_event__id("sys_enter_open");
339 
340 	if (id < 0) {
341 		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
342 		return -1;
343 	}
344 
345 	threads = thread_map__new(-1, getpid());
346 	if (threads == NULL) {
347 		pr_debug("thread_map__new\n");
348 		return -1;
349 	}
350 
351 	cpus = cpu_map__new(NULL);
352 	if (cpus == NULL) {
353 		pr_debug("cpu_map__new\n");
354 		goto out_thread_map_delete;
355 	}
356 
357 
358 	CPU_ZERO(&cpu_set);
359 
360 	memset(&attr, 0, sizeof(attr));
361 	attr.type = PERF_TYPE_TRACEPOINT;
362 	attr.config = id;
363 	evsel = perf_evsel__new(&attr, 0);
364 	if (evsel == NULL) {
365 		pr_debug("perf_evsel__new\n");
366 		goto out_thread_map_delete;
367 	}
368 
369 	if (perf_evsel__open(evsel, cpus, threads, false, NULL) < 0) {
370 		pr_debug("failed to open counter: %s, "
371 			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
372 			 strerror(errno));
373 		goto out_evsel_delete;
374 	}
375 
376 	for (cpu = 0; cpu < cpus->nr; ++cpu) {
377 		unsigned int ncalls = nr_open_calls + cpu;
378 		/*
379 		 * XXX eventually lift this restriction in a way that
380 		 * keeps perf building on older glibc installations
381 		 * without CPU_ALLOC. 1024 cpus in 2010 still seems
382 		 * a reasonable upper limit tho :-)
383 		 */
384 		if (cpus->map[cpu] >= CPU_SETSIZE) {
385 			pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
386 			continue;
387 		}
388 
389 		CPU_SET(cpus->map[cpu], &cpu_set);
390 		if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
391 			pr_debug("sched_setaffinity() failed on CPU %d: %s ",
392 				 cpus->map[cpu],
393 				 strerror(errno));
394 			goto out_close_fd;
395 		}
396 		for (i = 0; i < ncalls; ++i) {
397 			fd = open("/etc/passwd", O_RDONLY);
398 			close(fd);
399 		}
400 		CPU_CLR(cpus->map[cpu], &cpu_set);
401 	}
402 
403 	/*
404 	 * Here we need to explicitely preallocate the counts, as if
405 	 * we use the auto allocation it will allocate just for 1 cpu,
406 	 * as we start by cpu 0.
407 	 */
408 	if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
409 		pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
410 		goto out_close_fd;
411 	}
412 
413 	err = 0;
414 
415 	for (cpu = 0; cpu < cpus->nr; ++cpu) {
416 		unsigned int expected;
417 
418 		if (cpus->map[cpu] >= CPU_SETSIZE)
419 			continue;
420 
421 		if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
422 			pr_debug("perf_evsel__read_on_cpu\n");
423 			err = -1;
424 			break;
425 		}
426 
427 		expected = nr_open_calls + cpu;
428 		if (evsel->counts->cpu[cpu].val != expected) {
429 			pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
430 				 expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
431 			err = -1;
432 		}
433 	}
434 
435 out_close_fd:
436 	perf_evsel__close_fd(evsel, 1, threads->nr);
437 out_evsel_delete:
438 	perf_evsel__delete(evsel);
439 out_thread_map_delete:
440 	thread_map__delete(threads);
441 	return err;
442 }
443 
444 /*
445  * This test will generate random numbers of calls to some getpid syscalls,
446  * then establish an mmap for a group of events that are created to monitor
447  * the syscalls.
448  *
449  * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
450  * sample.id field to map back to its respective perf_evsel instance.
451  *
452  * Then it checks if the number of syscalls reported as perf events by
453  * the kernel corresponds to the number of syscalls made.
454  */
test__basic_mmap(void)455 static int test__basic_mmap(void)
456 {
457 	int err = -1;
458 	union perf_event *event;
459 	struct thread_map *threads;
460 	struct cpu_map *cpus;
461 	struct perf_evlist *evlist;
462 	struct perf_event_attr attr = {
463 		.type		= PERF_TYPE_TRACEPOINT,
464 		.read_format	= PERF_FORMAT_ID,
465 		.sample_type	= PERF_SAMPLE_ID,
466 		.watermark	= 0,
467 	};
468 	cpu_set_t cpu_set;
469 	const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
470 					"getpgid", };
471 	pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
472 				      (void*)getpgid };
473 #define nsyscalls ARRAY_SIZE(syscall_names)
474 	int ids[nsyscalls];
475 	unsigned int nr_events[nsyscalls],
476 		     expected_nr_events[nsyscalls], i, j;
477 	struct perf_evsel *evsels[nsyscalls], *evsel;
478 	int sample_size = __perf_evsel__sample_size(attr.sample_type);
479 
480 	for (i = 0; i < nsyscalls; ++i) {
481 		char name[64];
482 
483 		snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
484 		ids[i] = trace_event__id(name);
485 		if (ids[i] < 0) {
486 			pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
487 			return -1;
488 		}
489 		nr_events[i] = 0;
490 		expected_nr_events[i] = random() % 257;
491 	}
492 
493 	threads = thread_map__new(-1, getpid());
494 	if (threads == NULL) {
495 		pr_debug("thread_map__new\n");
496 		return -1;
497 	}
498 
499 	cpus = cpu_map__new(NULL);
500 	if (cpus == NULL) {
501 		pr_debug("cpu_map__new\n");
502 		goto out_free_threads;
503 	}
504 
505 	CPU_ZERO(&cpu_set);
506 	CPU_SET(cpus->map[0], &cpu_set);
507 	sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
508 	if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
509 		pr_debug("sched_setaffinity() failed on CPU %d: %s ",
510 			 cpus->map[0], strerror(errno));
511 		goto out_free_cpus;
512 	}
513 
514 	evlist = perf_evlist__new(cpus, threads);
515 	if (evlist == NULL) {
516 		pr_debug("perf_evlist__new\n");
517 		goto out_free_cpus;
518 	}
519 
520 	/* anonymous union fields, can't be initialized above */
521 	attr.wakeup_events = 1;
522 	attr.sample_period = 1;
523 
524 	for (i = 0; i < nsyscalls; ++i) {
525 		attr.config = ids[i];
526 		evsels[i] = perf_evsel__new(&attr, i);
527 		if (evsels[i] == NULL) {
528 			pr_debug("perf_evsel__new\n");
529 			goto out_free_evlist;
530 		}
531 
532 		perf_evlist__add(evlist, evsels[i]);
533 
534 		if (perf_evsel__open(evsels[i], cpus, threads, false, NULL) < 0) {
535 			pr_debug("failed to open counter: %s, "
536 				 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
537 				 strerror(errno));
538 			goto out_close_fd;
539 		}
540 	}
541 
542 	if (perf_evlist__mmap(evlist, 128, true) < 0) {
543 		pr_debug("failed to mmap events: %d (%s)\n", errno,
544 			 strerror(errno));
545 		goto out_close_fd;
546 	}
547 
548 	for (i = 0; i < nsyscalls; ++i)
549 		for (j = 0; j < expected_nr_events[i]; ++j) {
550 			int foo = syscalls[i]();
551 			++foo;
552 		}
553 
554 	while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
555 		struct perf_sample sample;
556 
557 		if (event->header.type != PERF_RECORD_SAMPLE) {
558 			pr_debug("unexpected %s event\n",
559 				 perf_event__name(event->header.type));
560 			goto out_munmap;
561 		}
562 
563 		err = perf_event__parse_sample(event, attr.sample_type, sample_size,
564 					       false, &sample, false);
565 		if (err) {
566 			pr_err("Can't parse sample, err = %d\n", err);
567 			goto out_munmap;
568 		}
569 
570 		evsel = perf_evlist__id2evsel(evlist, sample.id);
571 		if (evsel == NULL) {
572 			pr_debug("event with id %" PRIu64
573 				 " doesn't map to an evsel\n", sample.id);
574 			goto out_munmap;
575 		}
576 		nr_events[evsel->idx]++;
577 	}
578 
579 	list_for_each_entry(evsel, &evlist->entries, node) {
580 		if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
581 			pr_debug("expected %d %s events, got %d\n",
582 				 expected_nr_events[evsel->idx],
583 				 event_name(evsel), nr_events[evsel->idx]);
584 			goto out_munmap;
585 		}
586 	}
587 
588 	err = 0;
589 out_munmap:
590 	perf_evlist__munmap(evlist);
591 out_close_fd:
592 	for (i = 0; i < nsyscalls; ++i)
593 		perf_evsel__close_fd(evsels[i], 1, threads->nr);
594 out_free_evlist:
595 	perf_evlist__delete(evlist);
596 out_free_cpus:
597 	cpu_map__delete(cpus);
598 out_free_threads:
599 	thread_map__delete(threads);
600 	return err;
601 #undef nsyscalls
602 }
603 
604 #define TEST_ASSERT_VAL(text, cond) \
605 do { \
606 	if (!(cond)) { \
607 		pr_debug("FAILED %s:%d %s\n", __FILE__, __LINE__, text); \
608 		return -1; \
609 	} \
610 } while (0)
611 
test__checkevent_tracepoint(struct perf_evlist * evlist)612 static int test__checkevent_tracepoint(struct perf_evlist *evlist)
613 {
614 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
615 					      struct perf_evsel, node);
616 
617 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
618 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_TRACEPOINT == evsel->attr.type);
619 	TEST_ASSERT_VAL("wrong sample_type",
620 		(PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | PERF_SAMPLE_CPU) ==
621 		evsel->attr.sample_type);
622 	TEST_ASSERT_VAL("wrong sample_period", 1 == evsel->attr.sample_period);
623 	return 0;
624 }
625 
test__checkevent_tracepoint_multi(struct perf_evlist * evlist)626 static int test__checkevent_tracepoint_multi(struct perf_evlist *evlist)
627 {
628 	struct perf_evsel *evsel;
629 
630 	TEST_ASSERT_VAL("wrong number of entries", evlist->nr_entries > 1);
631 
632 	list_for_each_entry(evsel, &evlist->entries, node) {
633 		TEST_ASSERT_VAL("wrong type",
634 			PERF_TYPE_TRACEPOINT == evsel->attr.type);
635 		TEST_ASSERT_VAL("wrong sample_type",
636 			(PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | PERF_SAMPLE_CPU)
637 			== evsel->attr.sample_type);
638 		TEST_ASSERT_VAL("wrong sample_period",
639 			1 == evsel->attr.sample_period);
640 	}
641 	return 0;
642 }
643 
test__checkevent_raw(struct perf_evlist * evlist)644 static int test__checkevent_raw(struct perf_evlist *evlist)
645 {
646 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
647 					      struct perf_evsel, node);
648 
649 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
650 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_RAW == evsel->attr.type);
651 	TEST_ASSERT_VAL("wrong config", 1 == evsel->attr.config);
652 	return 0;
653 }
654 
test__checkevent_numeric(struct perf_evlist * evlist)655 static int test__checkevent_numeric(struct perf_evlist *evlist)
656 {
657 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
658 					      struct perf_evsel, node);
659 
660 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
661 	TEST_ASSERT_VAL("wrong type", 1 == evsel->attr.type);
662 	TEST_ASSERT_VAL("wrong config", 1 == evsel->attr.config);
663 	return 0;
664 }
665 
test__checkevent_symbolic_name(struct perf_evlist * evlist)666 static int test__checkevent_symbolic_name(struct perf_evlist *evlist)
667 {
668 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
669 					      struct perf_evsel, node);
670 
671 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
672 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->attr.type);
673 	TEST_ASSERT_VAL("wrong config",
674 			PERF_COUNT_HW_INSTRUCTIONS == evsel->attr.config);
675 	return 0;
676 }
677 
test__checkevent_symbolic_alias(struct perf_evlist * evlist)678 static int test__checkevent_symbolic_alias(struct perf_evlist *evlist)
679 {
680 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
681 					      struct perf_evsel, node);
682 
683 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
684 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_SOFTWARE == evsel->attr.type);
685 	TEST_ASSERT_VAL("wrong config",
686 			PERF_COUNT_SW_PAGE_FAULTS == evsel->attr.config);
687 	return 0;
688 }
689 
test__checkevent_genhw(struct perf_evlist * evlist)690 static int test__checkevent_genhw(struct perf_evlist *evlist)
691 {
692 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
693 					      struct perf_evsel, node);
694 
695 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
696 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_HW_CACHE == evsel->attr.type);
697 	TEST_ASSERT_VAL("wrong config", (1 << 16) == evsel->attr.config);
698 	return 0;
699 }
700 
test__checkevent_breakpoint(struct perf_evlist * evlist)701 static int test__checkevent_breakpoint(struct perf_evlist *evlist)
702 {
703 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
704 					      struct perf_evsel, node);
705 
706 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
707 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
708 	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
709 	TEST_ASSERT_VAL("wrong bp_type", (HW_BREAKPOINT_R | HW_BREAKPOINT_W) ==
710 					 evsel->attr.bp_type);
711 	TEST_ASSERT_VAL("wrong bp_len", HW_BREAKPOINT_LEN_4 ==
712 					evsel->attr.bp_len);
713 	return 0;
714 }
715 
test__checkevent_breakpoint_x(struct perf_evlist * evlist)716 static int test__checkevent_breakpoint_x(struct perf_evlist *evlist)
717 {
718 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
719 					      struct perf_evsel, node);
720 
721 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
722 	TEST_ASSERT_VAL("wrong type", PERF_TYPE_BREAKPOINT == evsel->attr.type);
723 	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
724 	TEST_ASSERT_VAL("wrong bp_type",
725 			HW_BREAKPOINT_X == evsel->attr.bp_type);
726 	TEST_ASSERT_VAL("wrong bp_len", sizeof(long) == evsel->attr.bp_len);
727 	return 0;
728 }
729 
test__checkevent_breakpoint_r(struct perf_evlist * evlist)730 static int test__checkevent_breakpoint_r(struct perf_evlist *evlist)
731 {
732 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
733 					      struct perf_evsel, node);
734 
735 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
736 	TEST_ASSERT_VAL("wrong type",
737 			PERF_TYPE_BREAKPOINT == evsel->attr.type);
738 	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
739 	TEST_ASSERT_VAL("wrong bp_type",
740 			HW_BREAKPOINT_R == evsel->attr.bp_type);
741 	TEST_ASSERT_VAL("wrong bp_len",
742 			HW_BREAKPOINT_LEN_4 == evsel->attr.bp_len);
743 	return 0;
744 }
745 
test__checkevent_breakpoint_w(struct perf_evlist * evlist)746 static int test__checkevent_breakpoint_w(struct perf_evlist *evlist)
747 {
748 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
749 					      struct perf_evsel, node);
750 
751 	TEST_ASSERT_VAL("wrong number of entries", 1 == evlist->nr_entries);
752 	TEST_ASSERT_VAL("wrong type",
753 			PERF_TYPE_BREAKPOINT == evsel->attr.type);
754 	TEST_ASSERT_VAL("wrong config", 0 == evsel->attr.config);
755 	TEST_ASSERT_VAL("wrong bp_type",
756 			HW_BREAKPOINT_W == evsel->attr.bp_type);
757 	TEST_ASSERT_VAL("wrong bp_len",
758 			HW_BREAKPOINT_LEN_4 == evsel->attr.bp_len);
759 	return 0;
760 }
761 
test__checkevent_tracepoint_modifier(struct perf_evlist * evlist)762 static int test__checkevent_tracepoint_modifier(struct perf_evlist *evlist)
763 {
764 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
765 					      struct perf_evsel, node);
766 
767 	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
768 	TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
769 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
770 	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
771 
772 	return test__checkevent_tracepoint(evlist);
773 }
774 
775 static int
test__checkevent_tracepoint_multi_modifier(struct perf_evlist * evlist)776 test__checkevent_tracepoint_multi_modifier(struct perf_evlist *evlist)
777 {
778 	struct perf_evsel *evsel;
779 
780 	TEST_ASSERT_VAL("wrong number of entries", evlist->nr_entries > 1);
781 
782 	list_for_each_entry(evsel, &evlist->entries, node) {
783 		TEST_ASSERT_VAL("wrong exclude_user",
784 				!evsel->attr.exclude_user);
785 		TEST_ASSERT_VAL("wrong exclude_kernel",
786 				evsel->attr.exclude_kernel);
787 		TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
788 		TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
789 	}
790 
791 	return test__checkevent_tracepoint_multi(evlist);
792 }
793 
test__checkevent_raw_modifier(struct perf_evlist * evlist)794 static int test__checkevent_raw_modifier(struct perf_evlist *evlist)
795 {
796 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
797 					      struct perf_evsel, node);
798 
799 	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
800 	TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
801 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
802 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
803 
804 	return test__checkevent_raw(evlist);
805 }
806 
test__checkevent_numeric_modifier(struct perf_evlist * evlist)807 static int test__checkevent_numeric_modifier(struct perf_evlist *evlist)
808 {
809 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
810 					      struct perf_evsel, node);
811 
812 	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
813 	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
814 	TEST_ASSERT_VAL("wrong exclude_hv", !evsel->attr.exclude_hv);
815 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
816 
817 	return test__checkevent_numeric(evlist);
818 }
819 
test__checkevent_symbolic_name_modifier(struct perf_evlist * evlist)820 static int test__checkevent_symbolic_name_modifier(struct perf_evlist *evlist)
821 {
822 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
823 					      struct perf_evsel, node);
824 
825 	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
826 	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
827 	TEST_ASSERT_VAL("wrong exclude_hv", !evsel->attr.exclude_hv);
828 	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
829 
830 	return test__checkevent_symbolic_name(evlist);
831 }
832 
test__checkevent_symbolic_alias_modifier(struct perf_evlist * evlist)833 static int test__checkevent_symbolic_alias_modifier(struct perf_evlist *evlist)
834 {
835 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
836 					      struct perf_evsel, node);
837 
838 	TEST_ASSERT_VAL("wrong exclude_user", !evsel->attr.exclude_user);
839 	TEST_ASSERT_VAL("wrong exclude_kernel", evsel->attr.exclude_kernel);
840 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
841 	TEST_ASSERT_VAL("wrong precise_ip", !evsel->attr.precise_ip);
842 
843 	return test__checkevent_symbolic_alias(evlist);
844 }
845 
test__checkevent_genhw_modifier(struct perf_evlist * evlist)846 static int test__checkevent_genhw_modifier(struct perf_evlist *evlist)
847 {
848 	struct perf_evsel *evsel = list_entry(evlist->entries.next,
849 					      struct perf_evsel, node);
850 
851 	TEST_ASSERT_VAL("wrong exclude_user", evsel->attr.exclude_user);
852 	TEST_ASSERT_VAL("wrong exclude_kernel", !evsel->attr.exclude_kernel);
853 	TEST_ASSERT_VAL("wrong exclude_hv", evsel->attr.exclude_hv);
854 	TEST_ASSERT_VAL("wrong precise_ip", evsel->attr.precise_ip);
855 
856 	return test__checkevent_genhw(evlist);
857 }
858 
859 static struct test__event_st {
860 	const char *name;
861 	__u32 type;
862 	int (*check)(struct perf_evlist *evlist);
863 } test__events[] = {
864 	{
865 		.name  = "syscalls:sys_enter_open",
866 		.check = test__checkevent_tracepoint,
867 	},
868 	{
869 		.name  = "syscalls:*",
870 		.check = test__checkevent_tracepoint_multi,
871 	},
872 	{
873 		.name  = "r1",
874 		.check = test__checkevent_raw,
875 	},
876 	{
877 		.name  = "1:1",
878 		.check = test__checkevent_numeric,
879 	},
880 	{
881 		.name  = "instructions",
882 		.check = test__checkevent_symbolic_name,
883 	},
884 	{
885 		.name  = "faults",
886 		.check = test__checkevent_symbolic_alias,
887 	},
888 	{
889 		.name  = "L1-dcache-load-miss",
890 		.check = test__checkevent_genhw,
891 	},
892 	{
893 		.name  = "mem:0",
894 		.check = test__checkevent_breakpoint,
895 	},
896 	{
897 		.name  = "mem:0:x",
898 		.check = test__checkevent_breakpoint_x,
899 	},
900 	{
901 		.name  = "mem:0:r",
902 		.check = test__checkevent_breakpoint_r,
903 	},
904 	{
905 		.name  = "mem:0:w",
906 		.check = test__checkevent_breakpoint_w,
907 	},
908 	{
909 		.name  = "syscalls:sys_enter_open:k",
910 		.check = test__checkevent_tracepoint_modifier,
911 	},
912 	{
913 		.name  = "syscalls:*:u",
914 		.check = test__checkevent_tracepoint_multi_modifier,
915 	},
916 	{
917 		.name  = "r1:kp",
918 		.check = test__checkevent_raw_modifier,
919 	},
920 	{
921 		.name  = "1:1:hp",
922 		.check = test__checkevent_numeric_modifier,
923 	},
924 	{
925 		.name  = "instructions:h",
926 		.check = test__checkevent_symbolic_name_modifier,
927 	},
928 	{
929 		.name  = "faults:u",
930 		.check = test__checkevent_symbolic_alias_modifier,
931 	},
932 	{
933 		.name  = "L1-dcache-load-miss:kp",
934 		.check = test__checkevent_genhw_modifier,
935 	},
936 };
937 
938 #define TEST__EVENTS_CNT (sizeof(test__events) / sizeof(struct test__event_st))
939 
test__parse_events(void)940 static int test__parse_events(void)
941 {
942 	struct perf_evlist *evlist;
943 	u_int i;
944 	int ret = 0;
945 
946 	for (i = 0; i < TEST__EVENTS_CNT; i++) {
947 		struct test__event_st *e = &test__events[i];
948 
949 		evlist = perf_evlist__new(NULL, NULL);
950 		if (evlist == NULL)
951 			break;
952 
953 		ret = parse_events(evlist, e->name, 0);
954 		if (ret) {
955 			pr_debug("failed to parse event '%s', err %d\n",
956 				 e->name, ret);
957 			break;
958 		}
959 
960 		ret = e->check(evlist);
961 		if (ret)
962 			break;
963 
964 		perf_evlist__delete(evlist);
965 	}
966 
967 	return ret;
968 }
969 
sched__get_first_possible_cpu(pid_t pid,cpu_set_t ** maskp,size_t * sizep)970 static int sched__get_first_possible_cpu(pid_t pid, cpu_set_t **maskp,
971 					 size_t *sizep)
972 {
973 	cpu_set_t *mask;
974 	size_t size;
975 	int i, cpu = -1, nrcpus = 1024;
976 realloc:
977 	mask = CPU_ALLOC(nrcpus);
978 	size = CPU_ALLOC_SIZE(nrcpus);
979 	CPU_ZERO_S(size, mask);
980 
981 	if (sched_getaffinity(pid, size, mask) == -1) {
982 		CPU_FREE(mask);
983 		if (errno == EINVAL && nrcpus < (1024 << 8)) {
984 			nrcpus = nrcpus << 2;
985 			goto realloc;
986 		}
987 		perror("sched_getaffinity");
988 			return -1;
989 	}
990 
991 	for (i = 0; i < nrcpus; i++) {
992 		if (CPU_ISSET_S(i, size, mask)) {
993 			if (cpu == -1) {
994 				cpu = i;
995 				*maskp = mask;
996 				*sizep = size;
997 			} else
998 				CPU_CLR_S(i, size, mask);
999 		}
1000 	}
1001 
1002 	if (cpu == -1)
1003 		CPU_FREE(mask);
1004 
1005 	return cpu;
1006 }
1007 
test__PERF_RECORD(void)1008 static int test__PERF_RECORD(void)
1009 {
1010 	struct perf_record_opts opts = {
1011 		.target_pid = -1,
1012 		.target_tid = -1,
1013 		.no_delay   = true,
1014 		.freq	    = 10,
1015 		.mmap_pages = 256,
1016 		.sample_id_all_avail = true,
1017 	};
1018 	cpu_set_t *cpu_mask = NULL;
1019 	size_t cpu_mask_size = 0;
1020 	struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
1021 	struct perf_evsel *evsel;
1022 	struct perf_sample sample;
1023 	const char *cmd = "sleep";
1024 	const char *argv[] = { cmd, "1", NULL, };
1025 	char *bname;
1026 	u64 sample_type, prev_time = 0;
1027 	bool found_cmd_mmap = false,
1028 	     found_libc_mmap = false,
1029 	     found_vdso_mmap = false,
1030 	     found_ld_mmap = false;
1031 	int err = -1, errs = 0, i, wakeups = 0, sample_size;
1032 	u32 cpu;
1033 	int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
1034 
1035 	if (evlist == NULL || argv == NULL) {
1036 		pr_debug("Not enough memory to create evlist\n");
1037 		goto out;
1038 	}
1039 
1040 	/*
1041 	 * We need at least one evsel in the evlist, use the default
1042 	 * one: "cycles".
1043 	 */
1044 	err = perf_evlist__add_default(evlist);
1045 	if (err < 0) {
1046 		pr_debug("Not enough memory to create evsel\n");
1047 		goto out_delete_evlist;
1048 	}
1049 
1050 	/*
1051 	 * Create maps of threads and cpus to monitor. In this case
1052 	 * we start with all threads and cpus (-1, -1) but then in
1053 	 * perf_evlist__prepare_workload we'll fill in the only thread
1054 	 * we're monitoring, the one forked there.
1055 	 */
1056 	err = perf_evlist__create_maps(evlist, opts.target_pid,
1057 				       opts.target_tid, opts.cpu_list);
1058 	if (err < 0) {
1059 		pr_debug("Not enough memory to create thread/cpu maps\n");
1060 		goto out_delete_evlist;
1061 	}
1062 
1063 	/*
1064 	 * Prepare the workload in argv[] to run, it'll fork it, and then wait
1065 	 * for perf_evlist__start_workload() to exec it. This is done this way
1066 	 * so that we have time to open the evlist (calling sys_perf_event_open
1067 	 * on all the fds) and then mmap them.
1068 	 */
1069 	err = perf_evlist__prepare_workload(evlist, &opts, argv);
1070 	if (err < 0) {
1071 		pr_debug("Couldn't run the workload!\n");
1072 		goto out_delete_evlist;
1073 	}
1074 
1075 	/*
1076 	 * Config the evsels, setting attr->comm on the first one, etc.
1077 	 */
1078 	evsel = list_entry(evlist->entries.next, struct perf_evsel, node);
1079 	evsel->attr.sample_type |= PERF_SAMPLE_CPU;
1080 	evsel->attr.sample_type |= PERF_SAMPLE_TID;
1081 	evsel->attr.sample_type |= PERF_SAMPLE_TIME;
1082 	perf_evlist__config_attrs(evlist, &opts);
1083 
1084 	err = sched__get_first_possible_cpu(evlist->workload.pid, &cpu_mask,
1085 					    &cpu_mask_size);
1086 	if (err < 0) {
1087 		pr_debug("sched__get_first_possible_cpu: %s\n", strerror(errno));
1088 		goto out_delete_evlist;
1089 	}
1090 
1091 	cpu = err;
1092 
1093 	/*
1094 	 * So that we can check perf_sample.cpu on all the samples.
1095 	 */
1096 	if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, cpu_mask) < 0) {
1097 		pr_debug("sched_setaffinity: %s\n", strerror(errno));
1098 		goto out_free_cpu_mask;
1099 	}
1100 
1101 	/*
1102 	 * Call sys_perf_event_open on all the fds on all the evsels,
1103 	 * grouping them if asked to.
1104 	 */
1105 	err = perf_evlist__open(evlist, opts.group);
1106 	if (err < 0) {
1107 		pr_debug("perf_evlist__open: %s\n", strerror(errno));
1108 		goto out_delete_evlist;
1109 	}
1110 
1111 	/*
1112 	 * mmap the first fd on a given CPU and ask for events for the other
1113 	 * fds in the same CPU to be injected in the same mmap ring buffer
1114 	 * (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
1115 	 */
1116 	err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
1117 	if (err < 0) {
1118 		pr_debug("perf_evlist__mmap: %s\n", strerror(errno));
1119 		goto out_delete_evlist;
1120 	}
1121 
1122 	/*
1123 	 * We'll need these two to parse the PERF_SAMPLE_* fields in each
1124 	 * event.
1125 	 */
1126 	sample_type = perf_evlist__sample_type(evlist);
1127 	sample_size = __perf_evsel__sample_size(sample_type);
1128 
1129 	/*
1130 	 * Now that all is properly set up, enable the events, they will
1131 	 * count just on workload.pid, which will start...
1132 	 */
1133 	perf_evlist__enable(evlist);
1134 
1135 	/*
1136 	 * Now!
1137 	 */
1138 	perf_evlist__start_workload(evlist);
1139 
1140 	while (1) {
1141 		int before = total_events;
1142 
1143 		for (i = 0; i < evlist->nr_mmaps; i++) {
1144 			union perf_event *event;
1145 
1146 			while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
1147 				const u32 type = event->header.type;
1148 				const char *name = perf_event__name(type);
1149 
1150 				++total_events;
1151 				if (type < PERF_RECORD_MAX)
1152 					nr_events[type]++;
1153 
1154 				err = perf_event__parse_sample(event, sample_type,
1155 							       sample_size, true,
1156 							       &sample, false);
1157 				if (err < 0) {
1158 					if (verbose)
1159 						perf_event__fprintf(event, stderr);
1160 					pr_debug("Couldn't parse sample\n");
1161 					goto out_err;
1162 				}
1163 
1164 				if (verbose) {
1165 					pr_info("%" PRIu64" %d ", sample.time, sample.cpu);
1166 					perf_event__fprintf(event, stderr);
1167 				}
1168 
1169 				if (prev_time > sample.time) {
1170 					pr_debug("%s going backwards in time, prev=%" PRIu64 ", curr=%" PRIu64 "\n",
1171 						 name, prev_time, sample.time);
1172 					++errs;
1173 				}
1174 
1175 				prev_time = sample.time;
1176 
1177 				if (sample.cpu != cpu) {
1178 					pr_debug("%s with unexpected cpu, expected %d, got %d\n",
1179 						 name, cpu, sample.cpu);
1180 					++errs;
1181 				}
1182 
1183 				if ((pid_t)sample.pid != evlist->workload.pid) {
1184 					pr_debug("%s with unexpected pid, expected %d, got %d\n",
1185 						 name, evlist->workload.pid, sample.pid);
1186 					++errs;
1187 				}
1188 
1189 				if ((pid_t)sample.tid != evlist->workload.pid) {
1190 					pr_debug("%s with unexpected tid, expected %d, got %d\n",
1191 						 name, evlist->workload.pid, sample.tid);
1192 					++errs;
1193 				}
1194 
1195 				if ((type == PERF_RECORD_COMM ||
1196 				     type == PERF_RECORD_MMAP ||
1197 				     type == PERF_RECORD_FORK ||
1198 				     type == PERF_RECORD_EXIT) &&
1199 				     (pid_t)event->comm.pid != evlist->workload.pid) {
1200 					pr_debug("%s with unexpected pid/tid\n", name);
1201 					++errs;
1202 				}
1203 
1204 				if ((type == PERF_RECORD_COMM ||
1205 				     type == PERF_RECORD_MMAP) &&
1206 				     event->comm.pid != event->comm.tid) {
1207 					pr_debug("%s with different pid/tid!\n", name);
1208 					++errs;
1209 				}
1210 
1211 				switch (type) {
1212 				case PERF_RECORD_COMM:
1213 					if (strcmp(event->comm.comm, cmd)) {
1214 						pr_debug("%s with unexpected comm!\n", name);
1215 						++errs;
1216 					}
1217 					break;
1218 				case PERF_RECORD_EXIT:
1219 					goto found_exit;
1220 				case PERF_RECORD_MMAP:
1221 					bname = strrchr(event->mmap.filename, '/');
1222 					if (bname != NULL) {
1223 						if (!found_cmd_mmap)
1224 							found_cmd_mmap = !strcmp(bname + 1, cmd);
1225 						if (!found_libc_mmap)
1226 							found_libc_mmap = !strncmp(bname + 1, "libc", 4);
1227 						if (!found_ld_mmap)
1228 							found_ld_mmap = !strncmp(bname + 1, "ld", 2);
1229 					} else if (!found_vdso_mmap)
1230 						found_vdso_mmap = !strcmp(event->mmap.filename, "[vdso]");
1231 					break;
1232 
1233 				case PERF_RECORD_SAMPLE:
1234 					/* Just ignore samples for now */
1235 					break;
1236 				default:
1237 					pr_debug("Unexpected perf_event->header.type %d!\n",
1238 						 type);
1239 					++errs;
1240 				}
1241 			}
1242 		}
1243 
1244 		/*
1245 		 * We don't use poll here because at least at 3.1 times the
1246 		 * PERF_RECORD_{!SAMPLE} events don't honour
1247 		 * perf_event_attr.wakeup_events, just PERF_EVENT_SAMPLE does.
1248 		 */
1249 		if (total_events == before && false)
1250 			poll(evlist->pollfd, evlist->nr_fds, -1);
1251 
1252 		sleep(1);
1253 		if (++wakeups > 5) {
1254 			pr_debug("No PERF_RECORD_EXIT event!\n");
1255 			break;
1256 		}
1257 	}
1258 
1259 found_exit:
1260 	if (nr_events[PERF_RECORD_COMM] > 1) {
1261 		pr_debug("Excessive number of PERF_RECORD_COMM events!\n");
1262 		++errs;
1263 	}
1264 
1265 	if (nr_events[PERF_RECORD_COMM] == 0) {
1266 		pr_debug("Missing PERF_RECORD_COMM for %s!\n", cmd);
1267 		++errs;
1268 	}
1269 
1270 	if (!found_cmd_mmap) {
1271 		pr_debug("PERF_RECORD_MMAP for %s missing!\n", cmd);
1272 		++errs;
1273 	}
1274 
1275 	if (!found_libc_mmap) {
1276 		pr_debug("PERF_RECORD_MMAP for %s missing!\n", "libc");
1277 		++errs;
1278 	}
1279 
1280 	if (!found_ld_mmap) {
1281 		pr_debug("PERF_RECORD_MMAP for %s missing!\n", "ld");
1282 		++errs;
1283 	}
1284 
1285 	if (!found_vdso_mmap) {
1286 		pr_debug("PERF_RECORD_MMAP for %s missing!\n", "[vdso]");
1287 		++errs;
1288 	}
1289 out_err:
1290 	perf_evlist__munmap(evlist);
1291 out_free_cpu_mask:
1292 	CPU_FREE(cpu_mask);
1293 out_delete_evlist:
1294 	perf_evlist__delete(evlist);
1295 out:
1296 	return (err < 0 || errs > 0) ? -1 : 0;
1297 }
1298 
1299 static struct test {
1300 	const char *desc;
1301 	int (*func)(void);
1302 } tests[] = {
1303 	{
1304 		.desc = "vmlinux symtab matches kallsyms",
1305 		.func = test__vmlinux_matches_kallsyms,
1306 	},
1307 	{
1308 		.desc = "detect open syscall event",
1309 		.func = test__open_syscall_event,
1310 	},
1311 	{
1312 		.desc = "detect open syscall event on all cpus",
1313 		.func = test__open_syscall_event_on_all_cpus,
1314 	},
1315 	{
1316 		.desc = "read samples using the mmap interface",
1317 		.func = test__basic_mmap,
1318 	},
1319 	{
1320 		.desc = "parse events tests",
1321 		.func = test__parse_events,
1322 	},
1323 	{
1324 		.desc = "Validate PERF_RECORD_* events & perf_sample fields",
1325 		.func = test__PERF_RECORD,
1326 	},
1327 	{
1328 		.func = NULL,
1329 	},
1330 };
1331 
perf_test__matches(int curr,int argc,const char * argv[])1332 static bool perf_test__matches(int curr, int argc, const char *argv[])
1333 {
1334 	int i;
1335 
1336 	if (argc == 0)
1337 		return true;
1338 
1339 	for (i = 0; i < argc; ++i) {
1340 		char *end;
1341 		long nr = strtoul(argv[i], &end, 10);
1342 
1343 		if (*end == '\0') {
1344 			if (nr == curr + 1)
1345 				return true;
1346 			continue;
1347 		}
1348 
1349 		if (strstr(tests[curr].desc, argv[i]))
1350 			return true;
1351 	}
1352 
1353 	return false;
1354 }
1355 
__cmd_test(int argc,const char * argv[])1356 static int __cmd_test(int argc, const char *argv[])
1357 {
1358 	int i = 0;
1359 
1360 	while (tests[i].func) {
1361 		int curr = i++, err;
1362 
1363 		if (!perf_test__matches(curr, argc, argv))
1364 			continue;
1365 
1366 		pr_info("%2d: %s:", i, tests[curr].desc);
1367 		pr_debug("\n--- start ---\n");
1368 		err = tests[curr].func();
1369 		pr_debug("---- end ----\n%s:", tests[curr].desc);
1370 		pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
1371 	}
1372 
1373 	return 0;
1374 }
1375 
perf_test__list(int argc,const char ** argv)1376 static int perf_test__list(int argc, const char **argv)
1377 {
1378 	int i = 0;
1379 
1380 	while (tests[i].func) {
1381 		int curr = i++;
1382 
1383 		if (argc > 1 && !strstr(tests[curr].desc, argv[1]))
1384 			continue;
1385 
1386 		pr_info("%2d: %s\n", i, tests[curr].desc);
1387 	}
1388 
1389 	return 0;
1390 }
1391 
cmd_test(int argc,const char ** argv,const char * prefix __used)1392 int cmd_test(int argc, const char **argv, const char *prefix __used)
1393 {
1394 	const char * const test_usage[] = {
1395 	"perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]",
1396 	NULL,
1397 	};
1398 	const struct option test_options[] = {
1399 	OPT_INCR('v', "verbose", &verbose,
1400 		    "be more verbose (show symbol address, etc)"),
1401 	OPT_END()
1402 	};
1403 
1404 	argc = parse_options(argc, argv, test_options, test_usage, 0);
1405 	if (argc >= 1 && !strcmp(argv[0], "list"))
1406 		return perf_test__list(argc, argv);
1407 
1408 	symbol_conf.priv_size = sizeof(int);
1409 	symbol_conf.sort_by_name = true;
1410 	symbol_conf.try_vmlinux_path = true;
1411 
1412 	if (symbol__init() < 0)
1413 		return -1;
1414 
1415 	setup_pager();
1416 
1417 	return __cmd_test(argc, argv);
1418 }
1419