xref: /openbmc/linux/tools/perf/util/event.c (revision e23feb16)
1 #include <linux/types.h>
2 #include "event.h"
3 #include "debug.h"
4 #include "machine.h"
5 #include "sort.h"
6 #include "string.h"
7 #include "strlist.h"
8 #include "thread.h"
9 #include "thread_map.h"
10 
11 static const char *perf_event__names[] = {
12 	[0]					= "TOTAL",
13 	[PERF_RECORD_MMAP]			= "MMAP",
14 	[PERF_RECORD_MMAP2]			= "MMAP2",
15 	[PERF_RECORD_LOST]			= "LOST",
16 	[PERF_RECORD_COMM]			= "COMM",
17 	[PERF_RECORD_EXIT]			= "EXIT",
18 	[PERF_RECORD_THROTTLE]			= "THROTTLE",
19 	[PERF_RECORD_UNTHROTTLE]		= "UNTHROTTLE",
20 	[PERF_RECORD_FORK]			= "FORK",
21 	[PERF_RECORD_READ]			= "READ",
22 	[PERF_RECORD_SAMPLE]			= "SAMPLE",
23 	[PERF_RECORD_HEADER_ATTR]		= "ATTR",
24 	[PERF_RECORD_HEADER_EVENT_TYPE]		= "EVENT_TYPE",
25 	[PERF_RECORD_HEADER_TRACING_DATA]	= "TRACING_DATA",
26 	[PERF_RECORD_HEADER_BUILD_ID]		= "BUILD_ID",
27 	[PERF_RECORD_FINISHED_ROUND]		= "FINISHED_ROUND",
28 };
29 
30 const char *perf_event__name(unsigned int id)
31 {
32 	if (id >= ARRAY_SIZE(perf_event__names))
33 		return "INVALID";
34 	if (!perf_event__names[id])
35 		return "UNKNOWN";
36 	return perf_event__names[id];
37 }
38 
39 static struct perf_sample synth_sample = {
40 	.pid	   = -1,
41 	.tid	   = -1,
42 	.time	   = -1,
43 	.stream_id = -1,
44 	.cpu	   = -1,
45 	.period	   = 1,
46 };
47 
48 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
49 {
50 	char filename[PATH_MAX];
51 	char bf[BUFSIZ];
52 	FILE *fp;
53 	size_t size = 0;
54 	pid_t tgid = -1;
55 
56 	snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
57 
58 	fp = fopen(filename, "r");
59 	if (fp == NULL) {
60 		pr_debug("couldn't open %s\n", filename);
61 		return 0;
62 	}
63 
64 	while (!comm[0] || (tgid < 0)) {
65 		if (fgets(bf, sizeof(bf), fp) == NULL) {
66 			pr_warning("couldn't get COMM and pgid, malformed %s\n",
67 				   filename);
68 			break;
69 		}
70 
71 		if (memcmp(bf, "Name:", 5) == 0) {
72 			char *name = bf + 5;
73 			while (*name && isspace(*name))
74 				++name;
75 			size = strlen(name) - 1;
76 			if (size >= len)
77 				size = len - 1;
78 			memcpy(comm, name, size);
79 			comm[size] = '\0';
80 
81 		} else if (memcmp(bf, "Tgid:", 5) == 0) {
82 			char *tgids = bf + 5;
83 			while (*tgids && isspace(*tgids))
84 				++tgids;
85 			tgid = atoi(tgids);
86 		}
87 	}
88 
89 	fclose(fp);
90 
91 	return tgid;
92 }
93 
94 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
95 					 union perf_event *event, pid_t pid,
96 					 int full,
97 					 perf_event__handler_t process,
98 					 struct machine *machine)
99 {
100 	char filename[PATH_MAX];
101 	size_t size;
102 	DIR *tasks;
103 	struct dirent dirent, *next;
104 	pid_t tgid;
105 
106 	memset(&event->comm, 0, sizeof(event->comm));
107 
108 	tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
109 					 sizeof(event->comm.comm));
110 	if (tgid < 0)
111 		goto out;
112 
113 	event->comm.pid = tgid;
114 	event->comm.header.type = PERF_RECORD_COMM;
115 
116 	size = strlen(event->comm.comm) + 1;
117 	size = PERF_ALIGN(size, sizeof(u64));
118 	memset(event->comm.comm + size, 0, machine->id_hdr_size);
119 	event->comm.header.size = (sizeof(event->comm) -
120 				(sizeof(event->comm.comm) - size) +
121 				machine->id_hdr_size);
122 	if (!full) {
123 		event->comm.tid = pid;
124 
125 		if (process(tool, event, &synth_sample, machine) != 0)
126 			return -1;
127 
128 		goto out;
129 	}
130 
131 	snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
132 
133 	tasks = opendir(filename);
134 	if (tasks == NULL) {
135 		pr_debug("couldn't open %s\n", filename);
136 		return 0;
137 	}
138 
139 	while (!readdir_r(tasks, &dirent, &next) && next) {
140 		char *end;
141 		pid = strtol(dirent.d_name, &end, 10);
142 		if (*end)
143 			continue;
144 
145 		/* already have tgid; jut want to update the comm */
146 		(void) perf_event__get_comm_tgid(pid, event->comm.comm,
147 					 sizeof(event->comm.comm));
148 
149 		size = strlen(event->comm.comm) + 1;
150 		size = PERF_ALIGN(size, sizeof(u64));
151 		memset(event->comm.comm + size, 0, machine->id_hdr_size);
152 		event->comm.header.size = (sizeof(event->comm) -
153 					  (sizeof(event->comm.comm) - size) +
154 					  machine->id_hdr_size);
155 
156 		event->comm.tid = pid;
157 
158 		if (process(tool, event, &synth_sample, machine) != 0) {
159 			tgid = -1;
160 			break;
161 		}
162 	}
163 
164 	closedir(tasks);
165 out:
166 	return tgid;
167 }
168 
169 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
170 					      union perf_event *event,
171 					      pid_t pid, pid_t tgid,
172 					      perf_event__handler_t process,
173 					      struct machine *machine)
174 {
175 	char filename[PATH_MAX];
176 	FILE *fp;
177 	int rc = 0;
178 
179 	snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
180 
181 	fp = fopen(filename, "r");
182 	if (fp == NULL) {
183 		/*
184 		 * We raced with a task exiting - just return:
185 		 */
186 		pr_debug("couldn't open %s\n", filename);
187 		return -1;
188 	}
189 
190 	event->header.type = PERF_RECORD_MMAP2;
191 	/*
192 	 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
193 	 */
194 	event->header.misc = PERF_RECORD_MISC_USER;
195 
196 	while (1) {
197 		char bf[BUFSIZ];
198 		char prot[5];
199 		char execname[PATH_MAX];
200 		char anonstr[] = "//anon";
201 		unsigned int ino;
202 		size_t size;
203 		ssize_t n;
204 
205 		if (fgets(bf, sizeof(bf), fp) == NULL)
206 			break;
207 
208 		/* ensure null termination since stack will be reused. */
209 		strcpy(execname, "");
210 
211 		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
212 		n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
213 		       &event->mmap2.start, &event->mmap2.len, prot,
214 		       &event->mmap2.pgoff, &event->mmap2.maj,
215 		       &event->mmap2.min,
216 		       &ino, execname);
217 
218 		event->mmap2.ino = (u64)ino;
219 
220 		if (n != 8)
221 			continue;
222 
223 		if (prot[2] != 'x')
224 			continue;
225 
226 		if (!strcmp(execname, ""))
227 			strcpy(execname, anonstr);
228 
229 		size = strlen(execname) + 1;
230 		memcpy(event->mmap2.filename, execname, size);
231 		size = PERF_ALIGN(size, sizeof(u64));
232 		event->mmap2.len -= event->mmap.start;
233 		event->mmap2.header.size = (sizeof(event->mmap2) -
234 					(sizeof(event->mmap2.filename) - size));
235 		memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
236 		event->mmap2.header.size += machine->id_hdr_size;
237 		event->mmap2.pid = tgid;
238 		event->mmap2.tid = pid;
239 
240 		if (process(tool, event, &synth_sample, machine) != 0) {
241 			rc = -1;
242 			break;
243 		}
244 	}
245 
246 	fclose(fp);
247 	return rc;
248 }
249 
250 int perf_event__synthesize_modules(struct perf_tool *tool,
251 				   perf_event__handler_t process,
252 				   struct machine *machine)
253 {
254 	int rc = 0;
255 	struct rb_node *nd;
256 	struct map_groups *kmaps = &machine->kmaps;
257 	union perf_event *event = zalloc((sizeof(event->mmap) +
258 					  machine->id_hdr_size));
259 	if (event == NULL) {
260 		pr_debug("Not enough memory synthesizing mmap event "
261 			 "for kernel modules\n");
262 		return -1;
263 	}
264 
265 	event->header.type = PERF_RECORD_MMAP;
266 
267 	/*
268 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
269 	 * __perf_event_mmap
270 	 */
271 	if (machine__is_host(machine))
272 		event->header.misc = PERF_RECORD_MISC_KERNEL;
273 	else
274 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
275 
276 	for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
277 	     nd; nd = rb_next(nd)) {
278 		size_t size;
279 		struct map *pos = rb_entry(nd, struct map, rb_node);
280 
281 		if (pos->dso->kernel)
282 			continue;
283 
284 		size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
285 		event->mmap.header.type = PERF_RECORD_MMAP;
286 		event->mmap.header.size = (sizeof(event->mmap) -
287 				        (sizeof(event->mmap.filename) - size));
288 		memset(event->mmap.filename + size, 0, machine->id_hdr_size);
289 		event->mmap.header.size += machine->id_hdr_size;
290 		event->mmap.start = pos->start;
291 		event->mmap.len   = pos->end - pos->start;
292 		event->mmap.pid   = machine->pid;
293 
294 		memcpy(event->mmap.filename, pos->dso->long_name,
295 		       pos->dso->long_name_len + 1);
296 		if (process(tool, event, &synth_sample, machine) != 0) {
297 			rc = -1;
298 			break;
299 		}
300 	}
301 
302 	free(event);
303 	return rc;
304 }
305 
306 static int __event__synthesize_thread(union perf_event *comm_event,
307 				      union perf_event *mmap_event,
308 				      pid_t pid, int full,
309 					  perf_event__handler_t process,
310 				      struct perf_tool *tool,
311 				      struct machine *machine)
312 {
313 	pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
314 						 process, machine);
315 	if (tgid == -1)
316 		return -1;
317 	return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
318 						  process, machine);
319 }
320 
321 int perf_event__synthesize_thread_map(struct perf_tool *tool,
322 				      struct thread_map *threads,
323 				      perf_event__handler_t process,
324 				      struct machine *machine)
325 {
326 	union perf_event *comm_event, *mmap_event;
327 	int err = -1, thread, j;
328 
329 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
330 	if (comm_event == NULL)
331 		goto out;
332 
333 	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
334 	if (mmap_event == NULL)
335 		goto out_free_comm;
336 
337 	err = 0;
338 	for (thread = 0; thread < threads->nr; ++thread) {
339 		if (__event__synthesize_thread(comm_event, mmap_event,
340 					       threads->map[thread], 0,
341 					       process, tool, machine)) {
342 			err = -1;
343 			break;
344 		}
345 
346 		/*
347 		 * comm.pid is set to thread group id by
348 		 * perf_event__synthesize_comm
349 		 */
350 		if ((int) comm_event->comm.pid != threads->map[thread]) {
351 			bool need_leader = true;
352 
353 			/* is thread group leader in thread_map? */
354 			for (j = 0; j < threads->nr; ++j) {
355 				if ((int) comm_event->comm.pid == threads->map[j]) {
356 					need_leader = false;
357 					break;
358 				}
359 			}
360 
361 			/* if not, generate events for it */
362 			if (need_leader &&
363 			    __event__synthesize_thread(comm_event,
364 						      mmap_event,
365 						      comm_event->comm.pid, 0,
366 						      process, tool, machine)) {
367 				err = -1;
368 				break;
369 			}
370 		}
371 	}
372 	free(mmap_event);
373 out_free_comm:
374 	free(comm_event);
375 out:
376 	return err;
377 }
378 
379 int perf_event__synthesize_threads(struct perf_tool *tool,
380 				   perf_event__handler_t process,
381 				   struct machine *machine)
382 {
383 	DIR *proc;
384 	struct dirent dirent, *next;
385 	union perf_event *comm_event, *mmap_event;
386 	int err = -1;
387 
388 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
389 	if (comm_event == NULL)
390 		goto out;
391 
392 	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
393 	if (mmap_event == NULL)
394 		goto out_free_comm;
395 
396 	proc = opendir("/proc");
397 	if (proc == NULL)
398 		goto out_free_mmap;
399 
400 	while (!readdir_r(proc, &dirent, &next) && next) {
401 		char *end;
402 		pid_t pid = strtol(dirent.d_name, &end, 10);
403 
404 		if (*end) /* only interested in proper numerical dirents */
405 			continue;
406 		/*
407  		 * We may race with exiting thread, so don't stop just because
408  		 * one thread couldn't be synthesized.
409  		 */
410 		__event__synthesize_thread(comm_event, mmap_event, pid, 1,
411 					   process, tool, machine);
412 	}
413 
414 	err = 0;
415 	closedir(proc);
416 out_free_mmap:
417 	free(mmap_event);
418 out_free_comm:
419 	free(comm_event);
420 out:
421 	return err;
422 }
423 
424 struct process_symbol_args {
425 	const char *name;
426 	u64	   start;
427 };
428 
429 static int find_symbol_cb(void *arg, const char *name, char type,
430 			  u64 start)
431 {
432 	struct process_symbol_args *args = arg;
433 
434 	/*
435 	 * Must be a function or at least an alias, as in PARISC64, where "_text" is
436 	 * an 'A' to the same address as "_stext".
437 	 */
438 	if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
439 	      type == 'A') || strcmp(name, args->name))
440 		return 0;
441 
442 	args->start = start;
443 	return 1;
444 }
445 
446 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
447 				       perf_event__handler_t process,
448 				       struct machine *machine,
449 				       const char *symbol_name)
450 {
451 	size_t size;
452 	const char *filename, *mmap_name;
453 	char path[PATH_MAX];
454 	char name_buff[PATH_MAX];
455 	struct map *map;
456 	int err;
457 	/*
458 	 * We should get this from /sys/kernel/sections/.text, but till that is
459 	 * available use this, and after it is use this as a fallback for older
460 	 * kernels.
461 	 */
462 	struct process_symbol_args args = { .name = symbol_name, };
463 	union perf_event *event = zalloc((sizeof(event->mmap) +
464 					  machine->id_hdr_size));
465 	if (event == NULL) {
466 		pr_debug("Not enough memory synthesizing mmap event "
467 			 "for kernel modules\n");
468 		return -1;
469 	}
470 
471 	mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
472 	if (machine__is_host(machine)) {
473 		/*
474 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
475 		 * see kernel/perf_event.c __perf_event_mmap
476 		 */
477 		event->header.misc = PERF_RECORD_MISC_KERNEL;
478 		filename = "/proc/kallsyms";
479 	} else {
480 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
481 		if (machine__is_default_guest(machine))
482 			filename = (char *) symbol_conf.default_guest_kallsyms;
483 		else {
484 			sprintf(path, "%s/proc/kallsyms", machine->root_dir);
485 			filename = path;
486 		}
487 	}
488 
489 	if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
490 		free(event);
491 		return -ENOENT;
492 	}
493 
494 	map = machine->vmlinux_maps[MAP__FUNCTION];
495 	size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
496 			"%s%s", mmap_name, symbol_name) + 1;
497 	size = PERF_ALIGN(size, sizeof(u64));
498 	event->mmap.header.type = PERF_RECORD_MMAP;
499 	event->mmap.header.size = (sizeof(event->mmap) -
500 			(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
501 	event->mmap.pgoff = args.start;
502 	event->mmap.start = map->start;
503 	event->mmap.len   = map->end - event->mmap.start;
504 	event->mmap.pid   = machine->pid;
505 
506 	err = process(tool, event, &synth_sample, machine);
507 	free(event);
508 
509 	return err;
510 }
511 
512 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
513 {
514 	return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
515 }
516 
517 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
518 			     union perf_event *event,
519 			     struct perf_sample *sample __maybe_unused,
520 			     struct machine *machine)
521 {
522 	return machine__process_comm_event(machine, event);
523 }
524 
525 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
526 			     union perf_event *event,
527 			     struct perf_sample *sample __maybe_unused,
528 			     struct machine *machine)
529 {
530 	return machine__process_lost_event(machine, event);
531 }
532 
533 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
534 {
535 	return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
536 		       event->mmap.pid, event->mmap.tid, event->mmap.start,
537 		       event->mmap.len, event->mmap.pgoff, event->mmap.filename);
538 }
539 
540 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
541 {
542 	return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
543 			   " %02x:%02x %"PRIu64" %"PRIu64"]: %s\n",
544 		       event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
545 		       event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
546 		       event->mmap2.min, event->mmap2.ino,
547 		       event->mmap2.ino_generation,
548 		       event->mmap2.filename);
549 }
550 
551 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
552 			     union perf_event *event,
553 			     struct perf_sample *sample __maybe_unused,
554 			     struct machine *machine)
555 {
556 	return machine__process_mmap_event(machine, event);
557 }
558 
559 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
560 			     union perf_event *event,
561 			     struct perf_sample *sample __maybe_unused,
562 			     struct machine *machine)
563 {
564 	return machine__process_mmap2_event(machine, event);
565 }
566 
567 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
568 {
569 	return fprintf(fp, "(%d:%d):(%d:%d)\n",
570 		       event->fork.pid, event->fork.tid,
571 		       event->fork.ppid, event->fork.ptid);
572 }
573 
574 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
575 			     union perf_event *event,
576 			     struct perf_sample *sample __maybe_unused,
577 			     struct machine *machine)
578 {
579 	return machine__process_fork_event(machine, event);
580 }
581 
582 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
583 			     union perf_event *event,
584 			     struct perf_sample *sample __maybe_unused,
585 			     struct machine *machine)
586 {
587 	return machine__process_exit_event(machine, event);
588 }
589 
590 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
591 {
592 	size_t ret = fprintf(fp, "PERF_RECORD_%s",
593 			     perf_event__name(event->header.type));
594 
595 	switch (event->header.type) {
596 	case PERF_RECORD_COMM:
597 		ret += perf_event__fprintf_comm(event, fp);
598 		break;
599 	case PERF_RECORD_FORK:
600 	case PERF_RECORD_EXIT:
601 		ret += perf_event__fprintf_task(event, fp);
602 		break;
603 	case PERF_RECORD_MMAP:
604 		ret += perf_event__fprintf_mmap(event, fp);
605 		break;
606 	case PERF_RECORD_MMAP2:
607 		ret += perf_event__fprintf_mmap2(event, fp);
608 		break;
609 	default:
610 		ret += fprintf(fp, "\n");
611 	}
612 
613 	return ret;
614 }
615 
616 int perf_event__process(struct perf_tool *tool __maybe_unused,
617 			union perf_event *event,
618 			struct perf_sample *sample __maybe_unused,
619 			struct machine *machine)
620 {
621 	return machine__process_event(machine, event);
622 }
623 
624 void thread__find_addr_map(struct thread *self,
625 			   struct machine *machine, u8 cpumode,
626 			   enum map_type type, u64 addr,
627 			   struct addr_location *al)
628 {
629 	struct map_groups *mg = &self->mg;
630 	bool load_map = false;
631 
632 	al->thread = self;
633 	al->addr = addr;
634 	al->cpumode = cpumode;
635 	al->filtered = false;
636 
637 	if (machine == NULL) {
638 		al->map = NULL;
639 		return;
640 	}
641 
642 	if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
643 		al->level = 'k';
644 		mg = &machine->kmaps;
645 		load_map = true;
646 	} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
647 		al->level = '.';
648 	} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
649 		al->level = 'g';
650 		mg = &machine->kmaps;
651 		load_map = true;
652 	} else {
653 		/*
654 		 * 'u' means guest os user space.
655 		 * TODO: We don't support guest user space. Might support late.
656 		 */
657 		if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
658 			al->level = 'u';
659 		else
660 			al->level = 'H';
661 		al->map = NULL;
662 
663 		if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
664 			cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
665 			!perf_guest)
666 			al->filtered = true;
667 		if ((cpumode == PERF_RECORD_MISC_USER ||
668 			cpumode == PERF_RECORD_MISC_KERNEL) &&
669 			!perf_host)
670 			al->filtered = true;
671 
672 		return;
673 	}
674 try_again:
675 	al->map = map_groups__find(mg, type, al->addr);
676 	if (al->map == NULL) {
677 		/*
678 		 * If this is outside of all known maps, and is a negative
679 		 * address, try to look it up in the kernel dso, as it might be
680 		 * a vsyscall or vdso (which executes in user-mode).
681 		 *
682 		 * XXX This is nasty, we should have a symbol list in the
683 		 * "[vdso]" dso, but for now lets use the old trick of looking
684 		 * in the whole kernel symbol list.
685 		 */
686 		if ((long long)al->addr < 0 &&
687 		    cpumode == PERF_RECORD_MISC_USER &&
688 		    machine && mg != &machine->kmaps) {
689 			mg = &machine->kmaps;
690 			goto try_again;
691 		}
692 	} else {
693 		/*
694 		 * Kernel maps might be changed when loading symbols so loading
695 		 * must be done prior to using kernel maps.
696 		 */
697 		if (load_map)
698 			map__load(al->map, machine->symbol_filter);
699 		al->addr = al->map->map_ip(al->map, al->addr);
700 	}
701 }
702 
703 void thread__find_addr_location(struct thread *thread, struct machine *machine,
704 				u8 cpumode, enum map_type type, u64 addr,
705 				struct addr_location *al)
706 {
707 	thread__find_addr_map(thread, machine, cpumode, type, addr, al);
708 	if (al->map != NULL)
709 		al->sym = map__find_symbol(al->map, al->addr,
710 					   machine->symbol_filter);
711 	else
712 		al->sym = NULL;
713 }
714 
715 int perf_event__preprocess_sample(const union perf_event *event,
716 				  struct machine *machine,
717 				  struct addr_location *al,
718 				  struct perf_sample *sample)
719 {
720 	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
721 	struct thread *thread = machine__findnew_thread(machine, sample->pid,
722 							sample->pid);
723 
724 	if (thread == NULL)
725 		return -1;
726 
727 	if (symbol_conf.comm_list &&
728 	    !strlist__has_entry(symbol_conf.comm_list, thread->comm))
729 		goto out_filtered;
730 
731 	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->tid);
732 	/*
733 	 * Have we already created the kernel maps for this machine?
734 	 *
735 	 * This should have happened earlier, when we processed the kernel MMAP
736 	 * events, but for older perf.data files there was no such thing, so do
737 	 * it now.
738 	 */
739 	if (cpumode == PERF_RECORD_MISC_KERNEL &&
740 	    machine->vmlinux_maps[MAP__FUNCTION] == NULL)
741 		machine__create_kernel_maps(machine);
742 
743 	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
744 			      sample->ip, al);
745 	dump_printf(" ...... dso: %s\n",
746 		    al->map ? al->map->dso->long_name :
747 			al->level == 'H' ? "[hypervisor]" : "<not found>");
748 	al->sym = NULL;
749 	al->cpu = sample->cpu;
750 
751 	if (al->map) {
752 		struct dso *dso = al->map->dso;
753 
754 		if (symbol_conf.dso_list &&
755 		    (!dso || !(strlist__has_entry(symbol_conf.dso_list,
756 						  dso->short_name) ||
757 			       (dso->short_name != dso->long_name &&
758 				strlist__has_entry(symbol_conf.dso_list,
759 						   dso->long_name)))))
760 			goto out_filtered;
761 
762 		al->sym = map__find_symbol(al->map, al->addr,
763 					   machine->symbol_filter);
764 	}
765 
766 	if (symbol_conf.sym_list &&
767 		(!al->sym || !strlist__has_entry(symbol_conf.sym_list,
768 						al->sym->name)))
769 		goto out_filtered;
770 
771 	return 0;
772 
773 out_filtered:
774 	al->filtered = true;
775 	return 0;
776 }
777