xref: /openbmc/linux/tools/perf/util/event.c (revision b34e08d5)
1 #include <linux/types.h>
2 #include "event.h"
3 #include "debug.h"
4 #include "hist.h"
5 #include "machine.h"
6 #include "sort.h"
7 #include "string.h"
8 #include "strlist.h"
9 #include "thread.h"
10 #include "thread_map.h"
11 #include "symbol/kallsyms.h"
12 
13 static const char *perf_event__names[] = {
14 	[0]					= "TOTAL",
15 	[PERF_RECORD_MMAP]			= "MMAP",
16 	[PERF_RECORD_MMAP2]			= "MMAP2",
17 	[PERF_RECORD_LOST]			= "LOST",
18 	[PERF_RECORD_COMM]			= "COMM",
19 	[PERF_RECORD_EXIT]			= "EXIT",
20 	[PERF_RECORD_THROTTLE]			= "THROTTLE",
21 	[PERF_RECORD_UNTHROTTLE]		= "UNTHROTTLE",
22 	[PERF_RECORD_FORK]			= "FORK",
23 	[PERF_RECORD_READ]			= "READ",
24 	[PERF_RECORD_SAMPLE]			= "SAMPLE",
25 	[PERF_RECORD_HEADER_ATTR]		= "ATTR",
26 	[PERF_RECORD_HEADER_EVENT_TYPE]		= "EVENT_TYPE",
27 	[PERF_RECORD_HEADER_TRACING_DATA]	= "TRACING_DATA",
28 	[PERF_RECORD_HEADER_BUILD_ID]		= "BUILD_ID",
29 	[PERF_RECORD_FINISHED_ROUND]		= "FINISHED_ROUND",
30 };
31 
32 const char *perf_event__name(unsigned int id)
33 {
34 	if (id >= ARRAY_SIZE(perf_event__names))
35 		return "INVALID";
36 	if (!perf_event__names[id])
37 		return "UNKNOWN";
38 	return perf_event__names[id];
39 }
40 
41 static struct perf_sample synth_sample = {
42 	.pid	   = -1,
43 	.tid	   = -1,
44 	.time	   = -1,
45 	.stream_id = -1,
46 	.cpu	   = -1,
47 	.period	   = 1,
48 };
49 
50 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
51 {
52 	char filename[PATH_MAX];
53 	char bf[BUFSIZ];
54 	FILE *fp;
55 	size_t size = 0;
56 	pid_t tgid = -1;
57 
58 	snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
59 
60 	fp = fopen(filename, "r");
61 	if (fp == NULL) {
62 		pr_debug("couldn't open %s\n", filename);
63 		return 0;
64 	}
65 
66 	while (!comm[0] || (tgid < 0)) {
67 		if (fgets(bf, sizeof(bf), fp) == NULL) {
68 			pr_warning("couldn't get COMM and pgid, malformed %s\n",
69 				   filename);
70 			break;
71 		}
72 
73 		if (memcmp(bf, "Name:", 5) == 0) {
74 			char *name = bf + 5;
75 			while (*name && isspace(*name))
76 				++name;
77 			size = strlen(name) - 1;
78 			if (size >= len)
79 				size = len - 1;
80 			memcpy(comm, name, size);
81 			comm[size] = '\0';
82 
83 		} else if (memcmp(bf, "Tgid:", 5) == 0) {
84 			char *tgids = bf + 5;
85 			while (*tgids && isspace(*tgids))
86 				++tgids;
87 			tgid = atoi(tgids);
88 		}
89 	}
90 
91 	fclose(fp);
92 
93 	return tgid;
94 }
95 
96 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
97 					 union perf_event *event, pid_t pid,
98 					 perf_event__handler_t process,
99 					 struct machine *machine)
100 {
101 	size_t size;
102 	pid_t tgid;
103 
104 	memset(&event->comm, 0, sizeof(event->comm));
105 
106 	if (machine__is_host(machine))
107 		tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
108 						 sizeof(event->comm.comm));
109 	else
110 		tgid = machine->pid;
111 
112 	if (tgid < 0)
113 		goto out;
114 
115 	event->comm.pid = tgid;
116 	event->comm.header.type = PERF_RECORD_COMM;
117 
118 	size = strlen(event->comm.comm) + 1;
119 	size = PERF_ALIGN(size, sizeof(u64));
120 	memset(event->comm.comm + size, 0, machine->id_hdr_size);
121 	event->comm.header.size = (sizeof(event->comm) -
122 				(sizeof(event->comm.comm) - size) +
123 				machine->id_hdr_size);
124 	event->comm.tid = pid;
125 
126 	if (process(tool, event, &synth_sample, machine) != 0)
127 		return -1;
128 
129 out:
130 	return tgid;
131 }
132 
133 static int perf_event__synthesize_fork(struct perf_tool *tool,
134 				       union perf_event *event, pid_t pid,
135 				       pid_t tgid, perf_event__handler_t process,
136 				       struct machine *machine)
137 {
138 	memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
139 
140 	/* this is really a clone event but we use fork to synthesize it */
141 	event->fork.ppid = tgid;
142 	event->fork.ptid = tgid;
143 	event->fork.pid  = tgid;
144 	event->fork.tid  = pid;
145 	event->fork.header.type = PERF_RECORD_FORK;
146 
147 	event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
148 
149 	if (process(tool, event, &synth_sample, machine) != 0)
150 		return -1;
151 
152 	return 0;
153 }
154 
155 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
156 				       union perf_event *event,
157 				       pid_t pid, pid_t tgid,
158 				       perf_event__handler_t process,
159 				       struct machine *machine,
160 				       bool mmap_data)
161 {
162 	char filename[PATH_MAX];
163 	FILE *fp;
164 	int rc = 0;
165 
166 	if (machine__is_default_guest(machine))
167 		return 0;
168 
169 	snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
170 		 machine->root_dir, pid);
171 
172 	fp = fopen(filename, "r");
173 	if (fp == NULL) {
174 		/*
175 		 * We raced with a task exiting - just return:
176 		 */
177 		pr_debug("couldn't open %s\n", filename);
178 		return -1;
179 	}
180 
181 	event->header.type = PERF_RECORD_MMAP;
182 
183 	while (1) {
184 		char bf[BUFSIZ];
185 		char prot[5];
186 		char execname[PATH_MAX];
187 		char anonstr[] = "//anon";
188 		size_t size;
189 		ssize_t n;
190 
191 		if (fgets(bf, sizeof(bf), fp) == NULL)
192 			break;
193 
194 		/* ensure null termination since stack will be reused. */
195 		strcpy(execname, "");
196 
197 		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
198 		n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
199 		       &event->mmap.start, &event->mmap.len, prot,
200 		       &event->mmap.pgoff,
201 		       execname);
202 		/*
203  		 * Anon maps don't have the execname.
204  		 */
205 		if (n < 4)
206 			continue;
207 		/*
208 		 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
209 		 */
210 		if (machine__is_host(machine))
211 			event->header.misc = PERF_RECORD_MISC_USER;
212 		else
213 			event->header.misc = PERF_RECORD_MISC_GUEST_USER;
214 
215 		if (prot[2] != 'x') {
216 			if (!mmap_data || prot[0] != 'r')
217 				continue;
218 
219 			event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
220 		}
221 
222 		if (!strcmp(execname, ""))
223 			strcpy(execname, anonstr);
224 
225 		size = strlen(execname) + 1;
226 		memcpy(event->mmap.filename, execname, size);
227 		size = PERF_ALIGN(size, sizeof(u64));
228 		event->mmap.len -= event->mmap.start;
229 		event->mmap.header.size = (sizeof(event->mmap) -
230 					(sizeof(event->mmap.filename) - size));
231 		memset(event->mmap.filename + size, 0, machine->id_hdr_size);
232 		event->mmap.header.size += machine->id_hdr_size;
233 		event->mmap.pid = tgid;
234 		event->mmap.tid = pid;
235 
236 		if (process(tool, event, &synth_sample, machine) != 0) {
237 			rc = -1;
238 			break;
239 		}
240 	}
241 
242 	fclose(fp);
243 	return rc;
244 }
245 
246 int perf_event__synthesize_modules(struct perf_tool *tool,
247 				   perf_event__handler_t process,
248 				   struct machine *machine)
249 {
250 	int rc = 0;
251 	struct rb_node *nd;
252 	struct map_groups *kmaps = &machine->kmaps;
253 	union perf_event *event = zalloc((sizeof(event->mmap) +
254 					  machine->id_hdr_size));
255 	if (event == NULL) {
256 		pr_debug("Not enough memory synthesizing mmap event "
257 			 "for kernel modules\n");
258 		return -1;
259 	}
260 
261 	event->header.type = PERF_RECORD_MMAP;
262 
263 	/*
264 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
265 	 * __perf_event_mmap
266 	 */
267 	if (machine__is_host(machine))
268 		event->header.misc = PERF_RECORD_MISC_KERNEL;
269 	else
270 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
271 
272 	for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
273 	     nd; nd = rb_next(nd)) {
274 		size_t size;
275 		struct map *pos = rb_entry(nd, struct map, rb_node);
276 
277 		if (pos->dso->kernel)
278 			continue;
279 
280 		size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
281 		event->mmap.header.type = PERF_RECORD_MMAP;
282 		event->mmap.header.size = (sizeof(event->mmap) -
283 				        (sizeof(event->mmap.filename) - size));
284 		memset(event->mmap.filename + size, 0, machine->id_hdr_size);
285 		event->mmap.header.size += machine->id_hdr_size;
286 		event->mmap.start = pos->start;
287 		event->mmap.len   = pos->end - pos->start;
288 		event->mmap.pid   = machine->pid;
289 
290 		memcpy(event->mmap.filename, pos->dso->long_name,
291 		       pos->dso->long_name_len + 1);
292 		if (process(tool, event, &synth_sample, machine) != 0) {
293 			rc = -1;
294 			break;
295 		}
296 	}
297 
298 	free(event);
299 	return rc;
300 }
301 
302 static int __event__synthesize_thread(union perf_event *comm_event,
303 				      union perf_event *mmap_event,
304 				      union perf_event *fork_event,
305 				      pid_t pid, int full,
306 					  perf_event__handler_t process,
307 				      struct perf_tool *tool,
308 				      struct machine *machine, bool mmap_data)
309 {
310 	char filename[PATH_MAX];
311 	DIR *tasks;
312 	struct dirent dirent, *next;
313 	pid_t tgid;
314 
315 	/* special case: only send one comm event using passed in pid */
316 	if (!full) {
317 		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
318 						   process, machine);
319 
320 		if (tgid == -1)
321 			return -1;
322 
323 		return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
324 							  process, machine, mmap_data);
325 	}
326 
327 	if (machine__is_default_guest(machine))
328 		return 0;
329 
330 	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
331 		 machine->root_dir, pid);
332 
333 	tasks = opendir(filename);
334 	if (tasks == NULL) {
335 		pr_debug("couldn't open %s\n", filename);
336 		return 0;
337 	}
338 
339 	while (!readdir_r(tasks, &dirent, &next) && next) {
340 		char *end;
341 		int rc = 0;
342 		pid_t _pid;
343 
344 		_pid = strtol(dirent.d_name, &end, 10);
345 		if (*end)
346 			continue;
347 
348 		tgid = perf_event__synthesize_comm(tool, comm_event, _pid,
349 						   process, machine);
350 		if (tgid == -1)
351 			return -1;
352 
353 		if (_pid == pid) {
354 			/* process the parent's maps too */
355 			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
356 						process, machine, mmap_data);
357 		} else {
358 			/* only fork the tid's map, to save time */
359 			rc = perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
360 						 process, machine);
361 		}
362 
363 		if (rc)
364 			return rc;
365 	}
366 
367 	closedir(tasks);
368 	return 0;
369 }
370 
371 int perf_event__synthesize_thread_map(struct perf_tool *tool,
372 				      struct thread_map *threads,
373 				      perf_event__handler_t process,
374 				      struct machine *machine,
375 				      bool mmap_data)
376 {
377 	union perf_event *comm_event, *mmap_event, *fork_event;
378 	int err = -1, thread, j;
379 
380 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
381 	if (comm_event == NULL)
382 		goto out;
383 
384 	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
385 	if (mmap_event == NULL)
386 		goto out_free_comm;
387 
388 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
389 	if (fork_event == NULL)
390 		goto out_free_mmap;
391 
392 	err = 0;
393 	for (thread = 0; thread < threads->nr; ++thread) {
394 		if (__event__synthesize_thread(comm_event, mmap_event,
395 					       fork_event,
396 					       threads->map[thread], 0,
397 					       process, tool, machine,
398 					       mmap_data)) {
399 			err = -1;
400 			break;
401 		}
402 
403 		/*
404 		 * comm.pid is set to thread group id by
405 		 * perf_event__synthesize_comm
406 		 */
407 		if ((int) comm_event->comm.pid != threads->map[thread]) {
408 			bool need_leader = true;
409 
410 			/* is thread group leader in thread_map? */
411 			for (j = 0; j < threads->nr; ++j) {
412 				if ((int) comm_event->comm.pid == threads->map[j]) {
413 					need_leader = false;
414 					break;
415 				}
416 			}
417 
418 			/* if not, generate events for it */
419 			if (need_leader &&
420 			    __event__synthesize_thread(comm_event, mmap_event,
421 						       fork_event,
422 						       comm_event->comm.pid, 0,
423 						       process, tool, machine,
424 						       mmap_data)) {
425 				err = -1;
426 				break;
427 			}
428 		}
429 	}
430 	free(fork_event);
431 out_free_mmap:
432 	free(mmap_event);
433 out_free_comm:
434 	free(comm_event);
435 out:
436 	return err;
437 }
438 
439 int perf_event__synthesize_threads(struct perf_tool *tool,
440 				   perf_event__handler_t process,
441 				   struct machine *machine, bool mmap_data)
442 {
443 	DIR *proc;
444 	char proc_path[PATH_MAX];
445 	struct dirent dirent, *next;
446 	union perf_event *comm_event, *mmap_event, *fork_event;
447 	int err = -1;
448 
449 	if (machine__is_default_guest(machine))
450 		return 0;
451 
452 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
453 	if (comm_event == NULL)
454 		goto out;
455 
456 	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
457 	if (mmap_event == NULL)
458 		goto out_free_comm;
459 
460 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
461 	if (fork_event == NULL)
462 		goto out_free_mmap;
463 
464 	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
465 	proc = opendir(proc_path);
466 
467 	if (proc == NULL)
468 		goto out_free_fork;
469 
470 	while (!readdir_r(proc, &dirent, &next) && next) {
471 		char *end;
472 		pid_t pid = strtol(dirent.d_name, &end, 10);
473 
474 		if (*end) /* only interested in proper numerical dirents */
475 			continue;
476 		/*
477  		 * We may race with exiting thread, so don't stop just because
478  		 * one thread couldn't be synthesized.
479  		 */
480 		__event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
481 					   1, process, tool, machine, mmap_data);
482 	}
483 
484 	err = 0;
485 	closedir(proc);
486 out_free_fork:
487 	free(fork_event);
488 out_free_mmap:
489 	free(mmap_event);
490 out_free_comm:
491 	free(comm_event);
492 out:
493 	return err;
494 }
495 
496 struct process_symbol_args {
497 	const char *name;
498 	u64	   start;
499 };
500 
501 static int find_symbol_cb(void *arg, const char *name, char type,
502 			  u64 start)
503 {
504 	struct process_symbol_args *args = arg;
505 
506 	/*
507 	 * Must be a function or at least an alias, as in PARISC64, where "_text" is
508 	 * an 'A' to the same address as "_stext".
509 	 */
510 	if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
511 	      type == 'A') || strcmp(name, args->name))
512 		return 0;
513 
514 	args->start = start;
515 	return 1;
516 }
517 
518 u64 kallsyms__get_function_start(const char *kallsyms_filename,
519 				 const char *symbol_name)
520 {
521 	struct process_symbol_args args = { .name = symbol_name, };
522 
523 	if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
524 		return 0;
525 
526 	return args.start;
527 }
528 
529 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
530 				       perf_event__handler_t process,
531 				       struct machine *machine)
532 {
533 	size_t size;
534 	const char *mmap_name;
535 	char name_buff[PATH_MAX];
536 	struct map *map;
537 	struct kmap *kmap;
538 	int err;
539 	/*
540 	 * We should get this from /sys/kernel/sections/.text, but till that is
541 	 * available use this, and after it is use this as a fallback for older
542 	 * kernels.
543 	 */
544 	union perf_event *event = zalloc((sizeof(event->mmap) +
545 					  machine->id_hdr_size));
546 	if (event == NULL) {
547 		pr_debug("Not enough memory synthesizing mmap event "
548 			 "for kernel modules\n");
549 		return -1;
550 	}
551 
552 	mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
553 	if (machine__is_host(machine)) {
554 		/*
555 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
556 		 * see kernel/perf_event.c __perf_event_mmap
557 		 */
558 		event->header.misc = PERF_RECORD_MISC_KERNEL;
559 	} else {
560 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
561 	}
562 
563 	map = machine->vmlinux_maps[MAP__FUNCTION];
564 	kmap = map__kmap(map);
565 	size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
566 			"%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
567 	size = PERF_ALIGN(size, sizeof(u64));
568 	event->mmap.header.type = PERF_RECORD_MMAP;
569 	event->mmap.header.size = (sizeof(event->mmap) -
570 			(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
571 	event->mmap.pgoff = kmap->ref_reloc_sym->addr;
572 	event->mmap.start = map->start;
573 	event->mmap.len   = map->end - event->mmap.start;
574 	event->mmap.pid   = machine->pid;
575 
576 	err = process(tool, event, &synth_sample, machine);
577 	free(event);
578 
579 	return err;
580 }
581 
582 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
583 {
584 	return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
585 }
586 
587 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
588 			     union perf_event *event,
589 			     struct perf_sample *sample,
590 			     struct machine *machine)
591 {
592 	return machine__process_comm_event(machine, event, sample);
593 }
594 
595 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
596 			     union perf_event *event,
597 			     struct perf_sample *sample,
598 			     struct machine *machine)
599 {
600 	return machine__process_lost_event(machine, event, sample);
601 }
602 
603 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
604 {
605 	return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
606 		       event->mmap.pid, event->mmap.tid, event->mmap.start,
607 		       event->mmap.len, event->mmap.pgoff,
608 		       (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
609 		       event->mmap.filename);
610 }
611 
612 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
613 {
614 	return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
615 			   " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
616 		       event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
617 		       event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
618 		       event->mmap2.min, event->mmap2.ino,
619 		       event->mmap2.ino_generation,
620 		       (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
621 		       event->mmap2.filename);
622 }
623 
624 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
625 			     union perf_event *event,
626 			     struct perf_sample *sample,
627 			     struct machine *machine)
628 {
629 	return machine__process_mmap_event(machine, event, sample);
630 }
631 
632 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
633 			     union perf_event *event,
634 			     struct perf_sample *sample,
635 			     struct machine *machine)
636 {
637 	return machine__process_mmap2_event(machine, event, sample);
638 }
639 
640 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
641 {
642 	return fprintf(fp, "(%d:%d):(%d:%d)\n",
643 		       event->fork.pid, event->fork.tid,
644 		       event->fork.ppid, event->fork.ptid);
645 }
646 
647 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
648 			     union perf_event *event,
649 			     struct perf_sample *sample,
650 			     struct machine *machine)
651 {
652 	return machine__process_fork_event(machine, event, sample);
653 }
654 
655 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
656 			     union perf_event *event,
657 			     struct perf_sample *sample,
658 			     struct machine *machine)
659 {
660 	return machine__process_exit_event(machine, event, sample);
661 }
662 
663 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
664 {
665 	size_t ret = fprintf(fp, "PERF_RECORD_%s",
666 			     perf_event__name(event->header.type));
667 
668 	switch (event->header.type) {
669 	case PERF_RECORD_COMM:
670 		ret += perf_event__fprintf_comm(event, fp);
671 		break;
672 	case PERF_RECORD_FORK:
673 	case PERF_RECORD_EXIT:
674 		ret += perf_event__fprintf_task(event, fp);
675 		break;
676 	case PERF_RECORD_MMAP:
677 		ret += perf_event__fprintf_mmap(event, fp);
678 		break;
679 	case PERF_RECORD_MMAP2:
680 		ret += perf_event__fprintf_mmap2(event, fp);
681 		break;
682 	default:
683 		ret += fprintf(fp, "\n");
684 	}
685 
686 	return ret;
687 }
688 
689 int perf_event__process(struct perf_tool *tool __maybe_unused,
690 			union perf_event *event,
691 			struct perf_sample *sample,
692 			struct machine *machine)
693 {
694 	return machine__process_event(machine, event, sample);
695 }
696 
697 void thread__find_addr_map(struct thread *thread,
698 			   struct machine *machine, u8 cpumode,
699 			   enum map_type type, u64 addr,
700 			   struct addr_location *al)
701 {
702 	struct map_groups *mg = &thread->mg;
703 	bool load_map = false;
704 
705 	al->machine = machine;
706 	al->thread = thread;
707 	al->addr = addr;
708 	al->cpumode = cpumode;
709 	al->filtered = 0;
710 
711 	if (machine == NULL) {
712 		al->map = NULL;
713 		return;
714 	}
715 
716 	if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
717 		al->level = 'k';
718 		mg = &machine->kmaps;
719 		load_map = true;
720 	} else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
721 		al->level = '.';
722 	} else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
723 		al->level = 'g';
724 		mg = &machine->kmaps;
725 		load_map = true;
726 	} else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
727 		al->level = 'u';
728 	} else {
729 		al->level = 'H';
730 		al->map = NULL;
731 
732 		if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
733 			cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
734 			!perf_guest)
735 			al->filtered |= (1 << HIST_FILTER__GUEST);
736 		if ((cpumode == PERF_RECORD_MISC_USER ||
737 			cpumode == PERF_RECORD_MISC_KERNEL) &&
738 			!perf_host)
739 			al->filtered |= (1 << HIST_FILTER__HOST);
740 
741 		return;
742 	}
743 try_again:
744 	al->map = map_groups__find(mg, type, al->addr);
745 	if (al->map == NULL) {
746 		/*
747 		 * If this is outside of all known maps, and is a negative
748 		 * address, try to look it up in the kernel dso, as it might be
749 		 * a vsyscall or vdso (which executes in user-mode).
750 		 *
751 		 * XXX This is nasty, we should have a symbol list in the
752 		 * "[vdso]" dso, but for now lets use the old trick of looking
753 		 * in the whole kernel symbol list.
754 		 */
755 		if ((long long)al->addr < 0 &&
756 		    cpumode == PERF_RECORD_MISC_USER &&
757 		    machine && mg != &machine->kmaps) {
758 			mg = &machine->kmaps;
759 			goto try_again;
760 		}
761 	} else {
762 		/*
763 		 * Kernel maps might be changed when loading symbols so loading
764 		 * must be done prior to using kernel maps.
765 		 */
766 		if (load_map)
767 			map__load(al->map, machine->symbol_filter);
768 		al->addr = al->map->map_ip(al->map, al->addr);
769 	}
770 }
771 
772 void thread__find_addr_location(struct thread *thread, struct machine *machine,
773 				u8 cpumode, enum map_type type, u64 addr,
774 				struct addr_location *al)
775 {
776 	thread__find_addr_map(thread, machine, cpumode, type, addr, al);
777 	if (al->map != NULL)
778 		al->sym = map__find_symbol(al->map, al->addr,
779 					   machine->symbol_filter);
780 	else
781 		al->sym = NULL;
782 }
783 
784 int perf_event__preprocess_sample(const union perf_event *event,
785 				  struct machine *machine,
786 				  struct addr_location *al,
787 				  struct perf_sample *sample)
788 {
789 	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
790 	struct thread *thread = machine__findnew_thread(machine, sample->pid,
791 							sample->pid);
792 
793 	if (thread == NULL)
794 		return -1;
795 
796 	dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
797 	/*
798 	 * Have we already created the kernel maps for this machine?
799 	 *
800 	 * This should have happened earlier, when we processed the kernel MMAP
801 	 * events, but for older perf.data files there was no such thing, so do
802 	 * it now.
803 	 */
804 	if (cpumode == PERF_RECORD_MISC_KERNEL &&
805 	    machine->vmlinux_maps[MAP__FUNCTION] == NULL)
806 		machine__create_kernel_maps(machine);
807 
808 	thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
809 			      sample->ip, al);
810 	dump_printf(" ...... dso: %s\n",
811 		    al->map ? al->map->dso->long_name :
812 			al->level == 'H' ? "[hypervisor]" : "<not found>");
813 
814 	if (thread__is_filtered(thread))
815 		al->filtered |= (1 << HIST_FILTER__THREAD);
816 
817 	al->sym = NULL;
818 	al->cpu = sample->cpu;
819 
820 	if (al->map) {
821 		struct dso *dso = al->map->dso;
822 
823 		if (symbol_conf.dso_list &&
824 		    (!dso || !(strlist__has_entry(symbol_conf.dso_list,
825 						  dso->short_name) ||
826 			       (dso->short_name != dso->long_name &&
827 				strlist__has_entry(symbol_conf.dso_list,
828 						   dso->long_name))))) {
829 			al->filtered |= (1 << HIST_FILTER__DSO);
830 		}
831 
832 		al->sym = map__find_symbol(al->map, al->addr,
833 					   machine->symbol_filter);
834 	}
835 
836 	if (symbol_conf.sym_list &&
837 		(!al->sym || !strlist__has_entry(symbol_conf.sym_list,
838 						al->sym->name))) {
839 		al->filtered |= (1 << HIST_FILTER__SYMBOL);
840 	}
841 
842 	return 0;
843 }
844