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[mirror_ubuntu-jammy-kernel.git] / tools / perf / util / session.c
1 #define _FILE_OFFSET_BITS 64
2
3 #include <linux/kernel.h>
4
5 #include <byteswap.h>
6 #include <unistd.h>
7 #include <sys/types.h>
8 #include <sys/mman.h>
9
10 #include "session.h"
11 #include "sort.h"
12 #include "util.h"
13
14 static int perf_session__open(struct perf_session *self, bool force)
15 {
16 struct stat input_stat;
17
18 if (!strcmp(self->filename, "-")) {
19 self->fd_pipe = true;
20 self->fd = STDIN_FILENO;
21
22 if (perf_header__read(self, self->fd) < 0)
23 pr_err("incompatible file format");
24
25 return 0;
26 }
27
28 self->fd = open(self->filename, O_RDONLY);
29 if (self->fd < 0) {
30 int err = errno;
31
32 pr_err("failed to open %s: %s", self->filename, strerror(err));
33 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
34 pr_err(" (try 'perf record' first)");
35 pr_err("\n");
36 return -errno;
37 }
38
39 if (fstat(self->fd, &input_stat) < 0)
40 goto out_close;
41
42 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
43 pr_err("file %s not owned by current user or root\n",
44 self->filename);
45 goto out_close;
46 }
47
48 if (!input_stat.st_size) {
49 pr_info("zero-sized file (%s), nothing to do!\n",
50 self->filename);
51 goto out_close;
52 }
53
54 if (perf_header__read(self, self->fd) < 0) {
55 pr_err("incompatible file format");
56 goto out_close;
57 }
58
59 self->size = input_stat.st_size;
60 return 0;
61
62 out_close:
63 close(self->fd);
64 self->fd = -1;
65 return -1;
66 }
67
68 static void perf_session__id_header_size(struct perf_session *session)
69 {
70 struct perf_sample *data;
71 u64 sample_type = session->sample_type;
72 u16 size = 0;
73
74 if (!session->sample_id_all)
75 goto out;
76
77 if (sample_type & PERF_SAMPLE_TID)
78 size += sizeof(data->tid) * 2;
79
80 if (sample_type & PERF_SAMPLE_TIME)
81 size += sizeof(data->time);
82
83 if (sample_type & PERF_SAMPLE_ID)
84 size += sizeof(data->id);
85
86 if (sample_type & PERF_SAMPLE_STREAM_ID)
87 size += sizeof(data->stream_id);
88
89 if (sample_type & PERF_SAMPLE_CPU)
90 size += sizeof(data->cpu) * 2;
91 out:
92 session->id_hdr_size = size;
93 }
94
95 void perf_session__set_sample_id_all(struct perf_session *session, bool value)
96 {
97 session->sample_id_all = value;
98 perf_session__id_header_size(session);
99 }
100
101 void perf_session__set_sample_type(struct perf_session *session, u64 type)
102 {
103 session->sample_type = type;
104 }
105
106 void perf_session__update_sample_type(struct perf_session *self)
107 {
108 self->sample_type = perf_header__sample_type(&self->header);
109 self->sample_id_all = perf_header__sample_id_all(&self->header);
110 perf_session__id_header_size(self);
111 }
112
113 int perf_session__create_kernel_maps(struct perf_session *self)
114 {
115 int ret = machine__create_kernel_maps(&self->host_machine);
116
117 if (ret >= 0)
118 ret = machines__create_guest_kernel_maps(&self->machines);
119 return ret;
120 }
121
122 static void perf_session__destroy_kernel_maps(struct perf_session *self)
123 {
124 machine__destroy_kernel_maps(&self->host_machine);
125 machines__destroy_guest_kernel_maps(&self->machines);
126 }
127
128 struct perf_session *perf_session__new(const char *filename, int mode,
129 bool force, bool repipe,
130 struct perf_event_ops *ops)
131 {
132 size_t len = filename ? strlen(filename) + 1 : 0;
133 struct perf_session *self = zalloc(sizeof(*self) + len);
134
135 if (self == NULL)
136 goto out;
137
138 if (perf_header__init(&self->header) < 0)
139 goto out_free;
140
141 memcpy(self->filename, filename, len);
142 self->threads = RB_ROOT;
143 INIT_LIST_HEAD(&self->dead_threads);
144 self->hists_tree = RB_ROOT;
145 self->last_match = NULL;
146 /*
147 * On 64bit we can mmap the data file in one go. No need for tiny mmap
148 * slices. On 32bit we use 32MB.
149 */
150 #if BITS_PER_LONG == 64
151 self->mmap_window = ULLONG_MAX;
152 #else
153 self->mmap_window = 32 * 1024 * 1024ULL;
154 #endif
155 self->machines = RB_ROOT;
156 self->repipe = repipe;
157 INIT_LIST_HEAD(&self->ordered_samples.samples);
158 INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
159 INIT_LIST_HEAD(&self->ordered_samples.to_free);
160 machine__init(&self->host_machine, "", HOST_KERNEL_ID);
161
162 if (mode == O_RDONLY) {
163 if (perf_session__open(self, force) < 0)
164 goto out_delete;
165 } else if (mode == O_WRONLY) {
166 /*
167 * In O_RDONLY mode this will be performed when reading the
168 * kernel MMAP event, in perf_event__process_mmap().
169 */
170 if (perf_session__create_kernel_maps(self) < 0)
171 goto out_delete;
172 }
173
174 perf_session__update_sample_type(self);
175
176 if (ops && ops->ordering_requires_timestamps &&
177 ops->ordered_samples && !self->sample_id_all) {
178 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
179 ops->ordered_samples = false;
180 }
181
182 out:
183 return self;
184 out_free:
185 free(self);
186 return NULL;
187 out_delete:
188 perf_session__delete(self);
189 return NULL;
190 }
191
192 static void perf_session__delete_dead_threads(struct perf_session *self)
193 {
194 struct thread *n, *t;
195
196 list_for_each_entry_safe(t, n, &self->dead_threads, node) {
197 list_del(&t->node);
198 thread__delete(t);
199 }
200 }
201
202 static void perf_session__delete_threads(struct perf_session *self)
203 {
204 struct rb_node *nd = rb_first(&self->threads);
205
206 while (nd) {
207 struct thread *t = rb_entry(nd, struct thread, rb_node);
208
209 rb_erase(&t->rb_node, &self->threads);
210 nd = rb_next(nd);
211 thread__delete(t);
212 }
213 }
214
215 void perf_session__delete(struct perf_session *self)
216 {
217 perf_header__exit(&self->header);
218 perf_session__destroy_kernel_maps(self);
219 perf_session__delete_dead_threads(self);
220 perf_session__delete_threads(self);
221 machine__exit(&self->host_machine);
222 close(self->fd);
223 free(self);
224 }
225
226 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
227 {
228 self->last_match = NULL;
229 rb_erase(&th->rb_node, &self->threads);
230 /*
231 * We may have references to this thread, for instance in some hist_entry
232 * instances, so just move them to a separate list.
233 */
234 list_add_tail(&th->node, &self->dead_threads);
235 }
236
237 static bool symbol__match_parent_regex(struct symbol *sym)
238 {
239 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
240 return 1;
241
242 return 0;
243 }
244
245 int perf_session__resolve_callchain(struct perf_session *self,
246 struct thread *thread,
247 struct ip_callchain *chain,
248 struct symbol **parent)
249 {
250 u8 cpumode = PERF_RECORD_MISC_USER;
251 unsigned int i;
252 int err;
253
254 callchain_cursor_reset(&self->callchain_cursor);
255
256 for (i = 0; i < chain->nr; i++) {
257 u64 ip = chain->ips[i];
258 struct addr_location al;
259
260 if (ip >= PERF_CONTEXT_MAX) {
261 switch (ip) {
262 case PERF_CONTEXT_HV:
263 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
264 case PERF_CONTEXT_KERNEL:
265 cpumode = PERF_RECORD_MISC_KERNEL; break;
266 case PERF_CONTEXT_USER:
267 cpumode = PERF_RECORD_MISC_USER; break;
268 default:
269 break;
270 }
271 continue;
272 }
273
274 al.filtered = false;
275 thread__find_addr_location(thread, self, cpumode,
276 MAP__FUNCTION, thread->pid, ip, &al, NULL);
277 if (al.sym != NULL) {
278 if (sort__has_parent && !*parent &&
279 symbol__match_parent_regex(al.sym))
280 *parent = al.sym;
281 if (!symbol_conf.use_callchain)
282 break;
283 }
284
285 err = callchain_cursor_append(&self->callchain_cursor,
286 ip, al.map, al.sym);
287 if (err)
288 return err;
289 }
290
291 return 0;
292 }
293
294 static int process_event_synth_stub(union perf_event *event __used,
295 struct perf_session *session __used)
296 {
297 dump_printf(": unhandled!\n");
298 return 0;
299 }
300
301 static int process_event_stub(union perf_event *event __used,
302 struct perf_sample *sample __used,
303 struct perf_session *session __used)
304 {
305 dump_printf(": unhandled!\n");
306 return 0;
307 }
308
309 static int process_finished_round_stub(union perf_event *event __used,
310 struct perf_session *session __used,
311 struct perf_event_ops *ops __used)
312 {
313 dump_printf(": unhandled!\n");
314 return 0;
315 }
316
317 static int process_finished_round(union perf_event *event,
318 struct perf_session *session,
319 struct perf_event_ops *ops);
320
321 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
322 {
323 if (handler->sample == NULL)
324 handler->sample = process_event_stub;
325 if (handler->mmap == NULL)
326 handler->mmap = process_event_stub;
327 if (handler->comm == NULL)
328 handler->comm = process_event_stub;
329 if (handler->fork == NULL)
330 handler->fork = process_event_stub;
331 if (handler->exit == NULL)
332 handler->exit = process_event_stub;
333 if (handler->lost == NULL)
334 handler->lost = perf_event__process_lost;
335 if (handler->read == NULL)
336 handler->read = process_event_stub;
337 if (handler->throttle == NULL)
338 handler->throttle = process_event_stub;
339 if (handler->unthrottle == NULL)
340 handler->unthrottle = process_event_stub;
341 if (handler->attr == NULL)
342 handler->attr = process_event_synth_stub;
343 if (handler->event_type == NULL)
344 handler->event_type = process_event_synth_stub;
345 if (handler->tracing_data == NULL)
346 handler->tracing_data = process_event_synth_stub;
347 if (handler->build_id == NULL)
348 handler->build_id = process_event_synth_stub;
349 if (handler->finished_round == NULL) {
350 if (handler->ordered_samples)
351 handler->finished_round = process_finished_round;
352 else
353 handler->finished_round = process_finished_round_stub;
354 }
355 }
356
357 void mem_bswap_64(void *src, int byte_size)
358 {
359 u64 *m = src;
360
361 while (byte_size > 0) {
362 *m = bswap_64(*m);
363 byte_size -= sizeof(u64);
364 ++m;
365 }
366 }
367
368 static void perf_event__all64_swap(union perf_event *event)
369 {
370 struct perf_event_header *hdr = &event->header;
371 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
372 }
373
374 static void perf_event__comm_swap(union perf_event *event)
375 {
376 event->comm.pid = bswap_32(event->comm.pid);
377 event->comm.tid = bswap_32(event->comm.tid);
378 }
379
380 static void perf_event__mmap_swap(union perf_event *event)
381 {
382 event->mmap.pid = bswap_32(event->mmap.pid);
383 event->mmap.tid = bswap_32(event->mmap.tid);
384 event->mmap.start = bswap_64(event->mmap.start);
385 event->mmap.len = bswap_64(event->mmap.len);
386 event->mmap.pgoff = bswap_64(event->mmap.pgoff);
387 }
388
389 static void perf_event__task_swap(union perf_event *event)
390 {
391 event->fork.pid = bswap_32(event->fork.pid);
392 event->fork.tid = bswap_32(event->fork.tid);
393 event->fork.ppid = bswap_32(event->fork.ppid);
394 event->fork.ptid = bswap_32(event->fork.ptid);
395 event->fork.time = bswap_64(event->fork.time);
396 }
397
398 static void perf_event__read_swap(union perf_event *event)
399 {
400 event->read.pid = bswap_32(event->read.pid);
401 event->read.tid = bswap_32(event->read.tid);
402 event->read.value = bswap_64(event->read.value);
403 event->read.time_enabled = bswap_64(event->read.time_enabled);
404 event->read.time_running = bswap_64(event->read.time_running);
405 event->read.id = bswap_64(event->read.id);
406 }
407
408 static void perf_event__attr_swap(union perf_event *event)
409 {
410 size_t size;
411
412 event->attr.attr.type = bswap_32(event->attr.attr.type);
413 event->attr.attr.size = bswap_32(event->attr.attr.size);
414 event->attr.attr.config = bswap_64(event->attr.attr.config);
415 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period);
416 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type);
417 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format);
418 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events);
419 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type);
420 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr);
421 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len);
422
423 size = event->header.size;
424 size -= (void *)&event->attr.id - (void *)event;
425 mem_bswap_64(event->attr.id, size);
426 }
427
428 static void perf_event__event_type_swap(union perf_event *event)
429 {
430 event->event_type.event_type.event_id =
431 bswap_64(event->event_type.event_type.event_id);
432 }
433
434 static void perf_event__tracing_data_swap(union perf_event *event)
435 {
436 event->tracing_data.size = bswap_32(event->tracing_data.size);
437 }
438
439 typedef void (*perf_event__swap_op)(union perf_event *event);
440
441 static perf_event__swap_op perf_event__swap_ops[] = {
442 [PERF_RECORD_MMAP] = perf_event__mmap_swap,
443 [PERF_RECORD_COMM] = perf_event__comm_swap,
444 [PERF_RECORD_FORK] = perf_event__task_swap,
445 [PERF_RECORD_EXIT] = perf_event__task_swap,
446 [PERF_RECORD_LOST] = perf_event__all64_swap,
447 [PERF_RECORD_READ] = perf_event__read_swap,
448 [PERF_RECORD_SAMPLE] = perf_event__all64_swap,
449 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap,
450 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
451 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
452 [PERF_RECORD_HEADER_BUILD_ID] = NULL,
453 [PERF_RECORD_HEADER_MAX] = NULL,
454 };
455
456 struct sample_queue {
457 u64 timestamp;
458 u64 file_offset;
459 union perf_event *event;
460 struct list_head list;
461 };
462
463 static void perf_session_free_sample_buffers(struct perf_session *session)
464 {
465 struct ordered_samples *os = &session->ordered_samples;
466
467 while (!list_empty(&os->to_free)) {
468 struct sample_queue *sq;
469
470 sq = list_entry(os->to_free.next, struct sample_queue, list);
471 list_del(&sq->list);
472 free(sq);
473 }
474 }
475
476 static int perf_session_deliver_event(struct perf_session *session,
477 union perf_event *event,
478 struct perf_sample *sample,
479 struct perf_event_ops *ops,
480 u64 file_offset);
481
482 static void flush_sample_queue(struct perf_session *s,
483 struct perf_event_ops *ops)
484 {
485 struct ordered_samples *os = &s->ordered_samples;
486 struct list_head *head = &os->samples;
487 struct sample_queue *tmp, *iter;
488 struct perf_sample sample;
489 u64 limit = os->next_flush;
490 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
491
492 if (!ops->ordered_samples || !limit)
493 return;
494
495 list_for_each_entry_safe(iter, tmp, head, list) {
496 if (iter->timestamp > limit)
497 break;
498
499 perf_session__parse_sample(s, iter->event, &sample);
500 perf_session_deliver_event(s, iter->event, &sample, ops,
501 iter->file_offset);
502
503 os->last_flush = iter->timestamp;
504 list_del(&iter->list);
505 list_add(&iter->list, &os->sample_cache);
506 }
507
508 if (list_empty(head)) {
509 os->last_sample = NULL;
510 } else if (last_ts <= limit) {
511 os->last_sample =
512 list_entry(head->prev, struct sample_queue, list);
513 }
514 }
515
516 /*
517 * When perf record finishes a pass on every buffers, it records this pseudo
518 * event.
519 * We record the max timestamp t found in the pass n.
520 * Assuming these timestamps are monotonic across cpus, we know that if
521 * a buffer still has events with timestamps below t, they will be all
522 * available and then read in the pass n + 1.
523 * Hence when we start to read the pass n + 2, we can safely flush every
524 * events with timestamps below t.
525 *
526 * ============ PASS n =================
527 * CPU 0 | CPU 1
528 * |
529 * cnt1 timestamps | cnt2 timestamps
530 * 1 | 2
531 * 2 | 3
532 * - | 4 <--- max recorded
533 *
534 * ============ PASS n + 1 ==============
535 * CPU 0 | CPU 1
536 * |
537 * cnt1 timestamps | cnt2 timestamps
538 * 3 | 5
539 * 4 | 6
540 * 5 | 7 <---- max recorded
541 *
542 * Flush every events below timestamp 4
543 *
544 * ============ PASS n + 2 ==============
545 * CPU 0 | CPU 1
546 * |
547 * cnt1 timestamps | cnt2 timestamps
548 * 6 | 8
549 * 7 | 9
550 * - | 10
551 *
552 * Flush every events below timestamp 7
553 * etc...
554 */
555 static int process_finished_round(union perf_event *event __used,
556 struct perf_session *session,
557 struct perf_event_ops *ops)
558 {
559 flush_sample_queue(session, ops);
560 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
561
562 return 0;
563 }
564
565 /* The queue is ordered by time */
566 static void __queue_event(struct sample_queue *new, struct perf_session *s)
567 {
568 struct ordered_samples *os = &s->ordered_samples;
569 struct sample_queue *sample = os->last_sample;
570 u64 timestamp = new->timestamp;
571 struct list_head *p;
572
573 os->last_sample = new;
574
575 if (!sample) {
576 list_add(&new->list, &os->samples);
577 os->max_timestamp = timestamp;
578 return;
579 }
580
581 /*
582 * last_sample might point to some random place in the list as it's
583 * the last queued event. We expect that the new event is close to
584 * this.
585 */
586 if (sample->timestamp <= timestamp) {
587 while (sample->timestamp <= timestamp) {
588 p = sample->list.next;
589 if (p == &os->samples) {
590 list_add_tail(&new->list, &os->samples);
591 os->max_timestamp = timestamp;
592 return;
593 }
594 sample = list_entry(p, struct sample_queue, list);
595 }
596 list_add_tail(&new->list, &sample->list);
597 } else {
598 while (sample->timestamp > timestamp) {
599 p = sample->list.prev;
600 if (p == &os->samples) {
601 list_add(&new->list, &os->samples);
602 return;
603 }
604 sample = list_entry(p, struct sample_queue, list);
605 }
606 list_add(&new->list, &sample->list);
607 }
608 }
609
610 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
611
612 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
613 struct perf_sample *sample, u64 file_offset)
614 {
615 struct ordered_samples *os = &s->ordered_samples;
616 struct list_head *sc = &os->sample_cache;
617 u64 timestamp = sample->time;
618 struct sample_queue *new;
619
620 if (!timestamp || timestamp == ~0ULL)
621 return -ETIME;
622
623 if (timestamp < s->ordered_samples.last_flush) {
624 printf("Warning: Timestamp below last timeslice flush\n");
625 return -EINVAL;
626 }
627
628 if (!list_empty(sc)) {
629 new = list_entry(sc->next, struct sample_queue, list);
630 list_del(&new->list);
631 } else if (os->sample_buffer) {
632 new = os->sample_buffer + os->sample_buffer_idx;
633 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
634 os->sample_buffer = NULL;
635 } else {
636 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
637 if (!os->sample_buffer)
638 return -ENOMEM;
639 list_add(&os->sample_buffer->list, &os->to_free);
640 os->sample_buffer_idx = 2;
641 new = os->sample_buffer + 1;
642 }
643
644 new->timestamp = timestamp;
645 new->file_offset = file_offset;
646 new->event = event;
647
648 __queue_event(new, s);
649
650 return 0;
651 }
652
653 static void callchain__printf(struct perf_sample *sample)
654 {
655 unsigned int i;
656
657 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
658
659 for (i = 0; i < sample->callchain->nr; i++)
660 printf("..... %2d: %016" PRIx64 "\n",
661 i, sample->callchain->ips[i]);
662 }
663
664 static void perf_session__print_tstamp(struct perf_session *session,
665 union perf_event *event,
666 struct perf_sample *sample)
667 {
668 if (event->header.type != PERF_RECORD_SAMPLE &&
669 !session->sample_id_all) {
670 fputs("-1 -1 ", stdout);
671 return;
672 }
673
674 if ((session->sample_type & PERF_SAMPLE_CPU))
675 printf("%u ", sample->cpu);
676
677 if (session->sample_type & PERF_SAMPLE_TIME)
678 printf("%" PRIu64 " ", sample->time);
679 }
680
681 static void dump_event(struct perf_session *session, union perf_event *event,
682 u64 file_offset, struct perf_sample *sample)
683 {
684 if (!dump_trace)
685 return;
686
687 printf("\n%#" PRIx64 " [%#x]: event: %d\n",
688 file_offset, event->header.size, event->header.type);
689
690 trace_event(event);
691
692 if (sample)
693 perf_session__print_tstamp(session, event, sample);
694
695 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
696 event->header.size, perf_event__name(event->header.type));
697 }
698
699 static void dump_sample(struct perf_session *session, union perf_event *event,
700 struct perf_sample *sample)
701 {
702 if (!dump_trace)
703 return;
704
705 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n",
706 event->header.misc, sample->pid, sample->tid, sample->ip,
707 sample->period);
708
709 if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
710 callchain__printf(sample);
711 }
712
713 static int perf_session_deliver_event(struct perf_session *session,
714 union perf_event *event,
715 struct perf_sample *sample,
716 struct perf_event_ops *ops,
717 u64 file_offset)
718 {
719 dump_event(session, event, file_offset, sample);
720
721 switch (event->header.type) {
722 case PERF_RECORD_SAMPLE:
723 dump_sample(session, event, sample);
724 return ops->sample(event, sample, session);
725 case PERF_RECORD_MMAP:
726 return ops->mmap(event, sample, session);
727 case PERF_RECORD_COMM:
728 return ops->comm(event, sample, session);
729 case PERF_RECORD_FORK:
730 return ops->fork(event, sample, session);
731 case PERF_RECORD_EXIT:
732 return ops->exit(event, sample, session);
733 case PERF_RECORD_LOST:
734 return ops->lost(event, sample, session);
735 case PERF_RECORD_READ:
736 return ops->read(event, sample, session);
737 case PERF_RECORD_THROTTLE:
738 return ops->throttle(event, sample, session);
739 case PERF_RECORD_UNTHROTTLE:
740 return ops->unthrottle(event, sample, session);
741 default:
742 ++session->hists.stats.nr_unknown_events;
743 return -1;
744 }
745 }
746
747 static int perf_session__preprocess_sample(struct perf_session *session,
748 union perf_event *event, struct perf_sample *sample)
749 {
750 if (event->header.type != PERF_RECORD_SAMPLE ||
751 !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
752 return 0;
753
754 if (!ip_callchain__valid(sample->callchain, event)) {
755 pr_debug("call-chain problem with event, skipping it.\n");
756 ++session->hists.stats.nr_invalid_chains;
757 session->hists.stats.total_invalid_chains += sample->period;
758 return -EINVAL;
759 }
760 return 0;
761 }
762
763 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
764 struct perf_event_ops *ops, u64 file_offset)
765 {
766 dump_event(session, event, file_offset, NULL);
767
768 /* These events are processed right away */
769 switch (event->header.type) {
770 case PERF_RECORD_HEADER_ATTR:
771 return ops->attr(event, session);
772 case PERF_RECORD_HEADER_EVENT_TYPE:
773 return ops->event_type(event, session);
774 case PERF_RECORD_HEADER_TRACING_DATA:
775 /* setup for reading amidst mmap */
776 lseek(session->fd, file_offset, SEEK_SET);
777 return ops->tracing_data(event, session);
778 case PERF_RECORD_HEADER_BUILD_ID:
779 return ops->build_id(event, session);
780 case PERF_RECORD_FINISHED_ROUND:
781 return ops->finished_round(event, session, ops);
782 default:
783 return -EINVAL;
784 }
785 }
786
787 static int perf_session__process_event(struct perf_session *session,
788 union perf_event *event,
789 struct perf_event_ops *ops,
790 u64 file_offset)
791 {
792 struct perf_sample sample;
793 int ret;
794
795 if (session->header.needs_swap &&
796 perf_event__swap_ops[event->header.type])
797 perf_event__swap_ops[event->header.type](event);
798
799 if (event->header.type >= PERF_RECORD_HEADER_MAX)
800 return -EINVAL;
801
802 hists__inc_nr_events(&session->hists, event->header.type);
803
804 if (event->header.type >= PERF_RECORD_USER_TYPE_START)
805 return perf_session__process_user_event(session, event, ops, file_offset);
806
807 /*
808 * For all kernel events we get the sample data
809 */
810 perf_session__parse_sample(session, event, &sample);
811
812 /* Preprocess sample records - precheck callchains */
813 if (perf_session__preprocess_sample(session, event, &sample))
814 return 0;
815
816 if (ops->ordered_samples) {
817 ret = perf_session_queue_event(session, event, &sample,
818 file_offset);
819 if (ret != -ETIME)
820 return ret;
821 }
822
823 return perf_session_deliver_event(session, event, &sample, ops,
824 file_offset);
825 }
826
827 void perf_event_header__bswap(struct perf_event_header *self)
828 {
829 self->type = bswap_32(self->type);
830 self->misc = bswap_16(self->misc);
831 self->size = bswap_16(self->size);
832 }
833
834 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
835 {
836 struct thread *thread = perf_session__findnew(self, 0);
837
838 if (thread == NULL || thread__set_comm(thread, "swapper")) {
839 pr_err("problem inserting idle task.\n");
840 thread = NULL;
841 }
842
843 return thread;
844 }
845
846 static void perf_session__warn_about_errors(const struct perf_session *session,
847 const struct perf_event_ops *ops)
848 {
849 if (ops->lost == perf_event__process_lost &&
850 session->hists.stats.total_lost != 0) {
851 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
852 "!\n\nCheck IO/CPU overload!\n\n",
853 session->hists.stats.total_period,
854 session->hists.stats.total_lost);
855 }
856
857 if (session->hists.stats.nr_unknown_events != 0) {
858 ui__warning("Found %u unknown events!\n\n"
859 "Is this an older tool processing a perf.data "
860 "file generated by a more recent tool?\n\n"
861 "If that is not the case, consider "
862 "reporting to linux-kernel@vger.kernel.org.\n\n",
863 session->hists.stats.nr_unknown_events);
864 }
865
866 if (session->hists.stats.nr_invalid_chains != 0) {
867 ui__warning("Found invalid callchains!\n\n"
868 "%u out of %u events were discarded for this reason.\n\n"
869 "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
870 session->hists.stats.nr_invalid_chains,
871 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
872 }
873 }
874
875 #define session_done() (*(volatile int *)(&session_done))
876 volatile int session_done;
877
878 static int __perf_session__process_pipe_events(struct perf_session *self,
879 struct perf_event_ops *ops)
880 {
881 union perf_event event;
882 uint32_t size;
883 int skip = 0;
884 u64 head;
885 int err;
886 void *p;
887
888 perf_event_ops__fill_defaults(ops);
889
890 head = 0;
891 more:
892 err = readn(self->fd, &event, sizeof(struct perf_event_header));
893 if (err <= 0) {
894 if (err == 0)
895 goto done;
896
897 pr_err("failed to read event header\n");
898 goto out_err;
899 }
900
901 if (self->header.needs_swap)
902 perf_event_header__bswap(&event.header);
903
904 size = event.header.size;
905 if (size == 0)
906 size = 8;
907
908 p = &event;
909 p += sizeof(struct perf_event_header);
910
911 if (size - sizeof(struct perf_event_header)) {
912 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
913 if (err <= 0) {
914 if (err == 0) {
915 pr_err("unexpected end of event stream\n");
916 goto done;
917 }
918
919 pr_err("failed to read event data\n");
920 goto out_err;
921 }
922 }
923
924 if (size == 0 ||
925 (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
926 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
927 head, event.header.size, event.header.type);
928 /*
929 * assume we lost track of the stream, check alignment, and
930 * increment a single u64 in the hope to catch on again 'soon'.
931 */
932 if (unlikely(head & 7))
933 head &= ~7ULL;
934
935 size = 8;
936 }
937
938 head += size;
939
940 if (skip > 0)
941 head += skip;
942
943 if (!session_done())
944 goto more;
945 done:
946 err = 0;
947 out_err:
948 perf_session__warn_about_errors(self, ops);
949 perf_session_free_sample_buffers(self);
950 return err;
951 }
952
953 int __perf_session__process_events(struct perf_session *session,
954 u64 data_offset, u64 data_size,
955 u64 file_size, struct perf_event_ops *ops)
956 {
957 u64 head, page_offset, file_offset, file_pos, progress_next;
958 int err, mmap_prot, mmap_flags, map_idx = 0;
959 struct ui_progress *progress;
960 size_t page_size, mmap_size;
961 char *buf, *mmaps[8];
962 union perf_event *event;
963 uint32_t size;
964
965 perf_event_ops__fill_defaults(ops);
966
967 page_size = sysconf(_SC_PAGESIZE);
968
969 page_offset = page_size * (data_offset / page_size);
970 file_offset = page_offset;
971 head = data_offset - page_offset;
972
973 if (data_offset + data_size < file_size)
974 file_size = data_offset + data_size;
975
976 progress_next = file_size / 16;
977 progress = ui_progress__new("Processing events...", file_size);
978 if (progress == NULL)
979 return -1;
980
981 mmap_size = session->mmap_window;
982 if (mmap_size > file_size)
983 mmap_size = file_size;
984
985 memset(mmaps, 0, sizeof(mmaps));
986
987 mmap_prot = PROT_READ;
988 mmap_flags = MAP_SHARED;
989
990 if (session->header.needs_swap) {
991 mmap_prot |= PROT_WRITE;
992 mmap_flags = MAP_PRIVATE;
993 }
994 remap:
995 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
996 file_offset);
997 if (buf == MAP_FAILED) {
998 pr_err("failed to mmap file\n");
999 err = -errno;
1000 goto out_err;
1001 }
1002 mmaps[map_idx] = buf;
1003 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1004 file_pos = file_offset + head;
1005
1006 more:
1007 event = (union perf_event *)(buf + head);
1008
1009 if (session->header.needs_swap)
1010 perf_event_header__bswap(&event->header);
1011 size = event->header.size;
1012 if (size == 0)
1013 size = 8;
1014
1015 if (head + event->header.size > mmap_size) {
1016 if (mmaps[map_idx]) {
1017 munmap(mmaps[map_idx], mmap_size);
1018 mmaps[map_idx] = NULL;
1019 }
1020
1021 page_offset = page_size * (head / page_size);
1022 file_offset += page_offset;
1023 head -= page_offset;
1024 goto remap;
1025 }
1026
1027 size = event->header.size;
1028
1029 if (size == 0 ||
1030 perf_session__process_event(session, event, ops, file_pos) < 0) {
1031 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1032 file_offset + head, event->header.size,
1033 event->header.type);
1034 /*
1035 * assume we lost track of the stream, check alignment, and
1036 * increment a single u64 in the hope to catch on again 'soon'.
1037 */
1038 if (unlikely(head & 7))
1039 head &= ~7ULL;
1040
1041 size = 8;
1042 }
1043
1044 head += size;
1045 file_pos += size;
1046
1047 if (file_pos >= progress_next) {
1048 progress_next += file_size / 16;
1049 ui_progress__update(progress, file_pos);
1050 }
1051
1052 if (file_pos < file_size)
1053 goto more;
1054
1055 err = 0;
1056 /* do the final flush for ordered samples */
1057 session->ordered_samples.next_flush = ULLONG_MAX;
1058 flush_sample_queue(session, ops);
1059 out_err:
1060 ui_progress__delete(progress);
1061 perf_session__warn_about_errors(session, ops);
1062 perf_session_free_sample_buffers(session);
1063 return err;
1064 }
1065
1066 int perf_session__process_events(struct perf_session *self,
1067 struct perf_event_ops *ops)
1068 {
1069 int err;
1070
1071 if (perf_session__register_idle_thread(self) == NULL)
1072 return -ENOMEM;
1073
1074 if (!self->fd_pipe)
1075 err = __perf_session__process_events(self,
1076 self->header.data_offset,
1077 self->header.data_size,
1078 self->size, ops);
1079 else
1080 err = __perf_session__process_pipe_events(self, ops);
1081
1082 return err;
1083 }
1084
1085 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1086 {
1087 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1088 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1089 return false;
1090 }
1091
1092 return true;
1093 }
1094
1095 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
1096 const char *symbol_name,
1097 u64 addr)
1098 {
1099 char *bracket;
1100 enum map_type i;
1101 struct ref_reloc_sym *ref;
1102
1103 ref = zalloc(sizeof(struct ref_reloc_sym));
1104 if (ref == NULL)
1105 return -ENOMEM;
1106
1107 ref->name = strdup(symbol_name);
1108 if (ref->name == NULL) {
1109 free(ref);
1110 return -ENOMEM;
1111 }
1112
1113 bracket = strchr(ref->name, ']');
1114 if (bracket)
1115 *bracket = '\0';
1116
1117 ref->addr = addr;
1118
1119 for (i = 0; i < MAP__NR_TYPES; ++i) {
1120 struct kmap *kmap = map__kmap(maps[i]);
1121 kmap->ref_reloc_sym = ref;
1122 }
1123
1124 return 0;
1125 }
1126
1127 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1128 {
1129 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1130 __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1131 machines__fprintf_dsos(&self->machines, fp);
1132 }
1133
1134 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1135 bool with_hits)
1136 {
1137 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1138 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1139 }
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