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staging: usbip: README: we need to document the protocol
[zen-stable.git] / tools / perf / util / session.c
blob64500fc787997e700a556f80531440926dfcf0c1
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 "evlist.h"
11 #include "evsel.h"
12 #include "session.h"
13 #include "sort.h"
14 #include "util.h"
15
16 static int perf_session__open(struct perf_session *self, bool force)
17 {
18 struct stat input_stat;
19
20 if (!strcmp(self->filename, "-")) {
21 self->fd_pipe = true;
22 self->fd = STDIN_FILENO;
23
24 if (perf_session__read_header(self, self->fd) < 0)
25 pr_err("incompatible file format");
26
27 return 0;
28 }
29
30 self->fd = open(self->filename, O_RDONLY);
31 if (self->fd < 0) {
32 int err = errno;
33
34 pr_err("failed to open %s: %s", self->filename, strerror(err));
35 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
36 pr_err(" (try 'perf record' first)");
37 pr_err("\n");
38 return -errno;
39 }
40
41 if (fstat(self->fd, &input_stat) < 0)
42 goto out_close;
43
44 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
45 pr_err("file %s not owned by current user or root\n",
46 self->filename);
47 goto out_close;
48 }
49
50 if (!input_stat.st_size) {
51 pr_info("zero-sized file (%s), nothing to do!\n",
52 self->filename);
53 goto out_close;
54 }
55
56 if (perf_session__read_header(self, self->fd) < 0) {
57 pr_err("incompatible file format");
58 goto out_close;
59 }
60
61 self->size = input_stat.st_size;
62 return 0;
63
64 out_close:
65 close(self->fd);
66 self->fd = -1;
67 return -1;
68 }
69
70 static void perf_session__id_header_size(struct perf_session *session)
71 {
72 struct perf_sample *data;
73 u64 sample_type = session->sample_type;
74 u16 size = 0;
75
76 if (!session->sample_id_all)
77 goto out;
78
79 if (sample_type & PERF_SAMPLE_TID)
80 size += sizeof(data->tid) * 2;
81
82 if (sample_type & PERF_SAMPLE_TIME)
83 size += sizeof(data->time);
84
85 if (sample_type & PERF_SAMPLE_ID)
86 size += sizeof(data->id);
87
88 if (sample_type & PERF_SAMPLE_STREAM_ID)
89 size += sizeof(data->stream_id);
90
91 if (sample_type & PERF_SAMPLE_CPU)
92 size += sizeof(data->cpu) * 2;
93 out:
94 session->id_hdr_size = size;
95 }
96
97 void perf_session__update_sample_type(struct perf_session *self)
98 {
99 self->sample_type = perf_evlist__sample_type(self->evlist);
100 self->sample_size = perf_sample_size(self->sample_type);
101 self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
102 perf_session__id_header_size(self);
103 }
104
105 int perf_session__create_kernel_maps(struct perf_session *self)
106 {
107 int ret = machine__create_kernel_maps(&self->host_machine);
108
109 if (ret >= 0)
110 ret = machines__create_guest_kernel_maps(&self->machines);
111 return ret;
112 }
113
114 static void perf_session__destroy_kernel_maps(struct perf_session *self)
115 {
116 machine__destroy_kernel_maps(&self->host_machine);
117 machines__destroy_guest_kernel_maps(&self->machines);
118 }
119
120 struct perf_session *perf_session__new(const char *filename, int mode,
121 bool force, bool repipe,
122 struct perf_event_ops *ops)
123 {
124 size_t len = filename ? strlen(filename) + 1 : 0;
125 struct perf_session *self = zalloc(sizeof(*self) + len);
126
127 if (self == NULL)
128 goto out;
129
130 memcpy(self->filename, filename, len);
131 self->threads = RB_ROOT;
132 INIT_LIST_HEAD(&self->dead_threads);
133 self->last_match = NULL;
134 /*
135 * On 64bit we can mmap the data file in one go. No need for tiny mmap
136 * slices. On 32bit we use 32MB.
137 */
138 #if BITS_PER_LONG == 64
139 self->mmap_window = ULLONG_MAX;
140 #else
141 self->mmap_window = 32 * 1024 * 1024ULL;
142 #endif
143 self->machines = RB_ROOT;
144 self->repipe = repipe;
145 INIT_LIST_HEAD(&self->ordered_samples.samples);
146 INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
147 INIT_LIST_HEAD(&self->ordered_samples.to_free);
148 machine__init(&self->host_machine, "", HOST_KERNEL_ID);
149
150 if (mode == O_RDONLY) {
151 if (perf_session__open(self, force) < 0)
152 goto out_delete;
153 perf_session__update_sample_type(self);
154 } else if (mode == O_WRONLY) {
155 /*
156 * In O_RDONLY mode this will be performed when reading the
157 * kernel MMAP event, in perf_event__process_mmap().
158 */
159 if (perf_session__create_kernel_maps(self) < 0)
160 goto out_delete;
161 }
162
163 if (ops && ops->ordering_requires_timestamps &&
164 ops->ordered_samples && !self->sample_id_all) {
165 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
166 ops->ordered_samples = false;
167 }
168
169 out:
170 return self;
171 out_delete:
172 perf_session__delete(self);
173 return NULL;
174 }
175
176 static void perf_session__delete_dead_threads(struct perf_session *self)
177 {
178 struct thread *n, *t;
179
180 list_for_each_entry_safe(t, n, &self->dead_threads, node) {
181 list_del(&t->node);
182 thread__delete(t);
183 }
184 }
185
186 static void perf_session__delete_threads(struct perf_session *self)
187 {
188 struct rb_node *nd = rb_first(&self->threads);
189
190 while (nd) {
191 struct thread *t = rb_entry(nd, struct thread, rb_node);
192
193 rb_erase(&t->rb_node, &self->threads);
194 nd = rb_next(nd);
195 thread__delete(t);
196 }
197 }
198
199 void perf_session__delete(struct perf_session *self)
200 {
201 perf_session__destroy_kernel_maps(self);
202 perf_session__delete_dead_threads(self);
203 perf_session__delete_threads(self);
204 machine__exit(&self->host_machine);
205 close(self->fd);
206 free(self);
207 }
208
209 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
210 {
211 self->last_match = NULL;
212 rb_erase(&th->rb_node, &self->threads);
213 /*
214 * We may have references to this thread, for instance in some hist_entry
215 * instances, so just move them to a separate list.
216 */
217 list_add_tail(&th->node, &self->dead_threads);
218 }
219
220 static bool symbol__match_parent_regex(struct symbol *sym)
221 {
222 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
223 return 1;
224
225 return 0;
226 }
227
228 int perf_session__resolve_callchain(struct perf_session *self,
229 struct thread *thread,
230 struct ip_callchain *chain,
231 struct symbol **parent)
232 {
233 u8 cpumode = PERF_RECORD_MISC_USER;
234 unsigned int i;
235 int err;
236
237 callchain_cursor_reset(&self->callchain_cursor);
238
239 for (i = 0; i < chain->nr; i++) {
240 u64 ip = chain->ips[i];
241 struct addr_location al;
242
243 if (ip >= PERF_CONTEXT_MAX) {
244 switch (ip) {
245 case PERF_CONTEXT_HV:
246 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
247 case PERF_CONTEXT_KERNEL:
248 cpumode = PERF_RECORD_MISC_KERNEL; break;
249 case PERF_CONTEXT_USER:
250 cpumode = PERF_RECORD_MISC_USER; break;
251 default:
252 break;
253 }
254 continue;
255 }
256
257 al.filtered = false;
258 thread__find_addr_location(thread, self, cpumode,
259 MAP__FUNCTION, thread->pid, ip, &al, NULL);
260 if (al.sym != NULL) {
261 if (sort__has_parent && !*parent &&
262 symbol__match_parent_regex(al.sym))
263 *parent = al.sym;
264 if (!symbol_conf.use_callchain)
265 break;
266 }
267
268 err = callchain_cursor_append(&self->callchain_cursor,
269 ip, al.map, al.sym);
270 if (err)
271 return err;
272 }
273
274 return 0;
275 }
276
277 static int process_event_synth_stub(union perf_event *event __used,
278 struct perf_session *session __used)
279 {
280 dump_printf(": unhandled!\n");
281 return 0;
282 }
283
284 static int process_event_sample_stub(union perf_event *event __used,
285 struct perf_sample *sample __used,
286 struct perf_evsel *evsel __used,
287 struct perf_session *session __used)
288 {
289 dump_printf(": unhandled!\n");
290 return 0;
291 }
292
293 static int process_event_stub(union perf_event *event __used,
294 struct perf_sample *sample __used,
295 struct perf_session *session __used)
296 {
297 dump_printf(": unhandled!\n");
298 return 0;
299 }
300
301 static int process_finished_round_stub(union perf_event *event __used,
302 struct perf_session *session __used,
303 struct perf_event_ops *ops __used)
304 {
305 dump_printf(": unhandled!\n");
306 return 0;
307 }
308
309 static int process_finished_round(union perf_event *event,
310 struct perf_session *session,
311 struct perf_event_ops *ops);
312
313 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
314 {
315 if (handler->sample == NULL)
316 handler->sample = process_event_sample_stub;
317 if (handler->mmap == NULL)
318 handler->mmap = process_event_stub;
319 if (handler->comm == NULL)
320 handler->comm = process_event_stub;
321 if (handler->fork == NULL)
322 handler->fork = process_event_stub;
323 if (handler->exit == NULL)
324 handler->exit = process_event_stub;
325 if (handler->lost == NULL)
326 handler->lost = perf_event__process_lost;
327 if (handler->read == NULL)
328 handler->read = process_event_stub;
329 if (handler->throttle == NULL)
330 handler->throttle = process_event_stub;
331 if (handler->unthrottle == NULL)
332 handler->unthrottle = process_event_stub;
333 if (handler->attr == NULL)
334 handler->attr = process_event_synth_stub;
335 if (handler->event_type == NULL)
336 handler->event_type = process_event_synth_stub;
337 if (handler->tracing_data == NULL)
338 handler->tracing_data = process_event_synth_stub;
339 if (handler->build_id == NULL)
340 handler->build_id = process_event_synth_stub;
341 if (handler->finished_round == NULL) {
342 if (handler->ordered_samples)
343 handler->finished_round = process_finished_round;
344 else
345 handler->finished_round = process_finished_round_stub;
346 }
347 }
348
349 void mem_bswap_64(void *src, int byte_size)
350 {
351 u64 *m = src;
352
353 while (byte_size > 0) {
354 *m = bswap_64(*m);
355 byte_size -= sizeof(u64);
356 ++m;
357 }
358 }
359
360 static void perf_event__all64_swap(union perf_event *event)
361 {
362 struct perf_event_header *hdr = &event->header;
363 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
364 }
365
366 static void perf_event__comm_swap(union perf_event *event)
367 {
368 event->comm.pid = bswap_32(event->comm.pid);
369 event->comm.tid = bswap_32(event->comm.tid);
370 }
371
372 static void perf_event__mmap_swap(union perf_event *event)
373 {
374 event->mmap.pid = bswap_32(event->mmap.pid);
375 event->mmap.tid = bswap_32(event->mmap.tid);
376 event->mmap.start = bswap_64(event->mmap.start);
377 event->mmap.len = bswap_64(event->mmap.len);
378 event->mmap.pgoff = bswap_64(event->mmap.pgoff);
379 }
380
381 static void perf_event__task_swap(union perf_event *event)
382 {
383 event->fork.pid = bswap_32(event->fork.pid);
384 event->fork.tid = bswap_32(event->fork.tid);
385 event->fork.ppid = bswap_32(event->fork.ppid);
386 event->fork.ptid = bswap_32(event->fork.ptid);
387 event->fork.time = bswap_64(event->fork.time);
388 }
389
390 static void perf_event__read_swap(union perf_event *event)
391 {
392 event->read.pid = bswap_32(event->read.pid);
393 event->read.tid = bswap_32(event->read.tid);
394 event->read.value = bswap_64(event->read.value);
395 event->read.time_enabled = bswap_64(event->read.time_enabled);
396 event->read.time_running = bswap_64(event->read.time_running);
397 event->read.id = bswap_64(event->read.id);
398 }
399
400 static void perf_event__attr_swap(union perf_event *event)
401 {
402 size_t size;
403
404 event->attr.attr.type = bswap_32(event->attr.attr.type);
405 event->attr.attr.size = bswap_32(event->attr.attr.size);
406 event->attr.attr.config = bswap_64(event->attr.attr.config);
407 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period);
408 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type);
409 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format);
410 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events);
411 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type);
412 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr);
413 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len);
414
415 size = event->header.size;
416 size -= (void *)&event->attr.id - (void *)event;
417 mem_bswap_64(event->attr.id, size);
418 }
419
420 static void perf_event__event_type_swap(union perf_event *event)
421 {
422 event->event_type.event_type.event_id =
423 bswap_64(event->event_type.event_type.event_id);
424 }
425
426 static void perf_event__tracing_data_swap(union perf_event *event)
427 {
428 event->tracing_data.size = bswap_32(event->tracing_data.size);
429 }
430
431 typedef void (*perf_event__swap_op)(union perf_event *event);
432
433 static perf_event__swap_op perf_event__swap_ops[] = {
434 [PERF_RECORD_MMAP] = perf_event__mmap_swap,
435 [PERF_RECORD_COMM] = perf_event__comm_swap,
436 [PERF_RECORD_FORK] = perf_event__task_swap,
437 [PERF_RECORD_EXIT] = perf_event__task_swap,
438 [PERF_RECORD_LOST] = perf_event__all64_swap,
439 [PERF_RECORD_READ] = perf_event__read_swap,
440 [PERF_RECORD_SAMPLE] = perf_event__all64_swap,
441 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap,
442 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
443 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
444 [PERF_RECORD_HEADER_BUILD_ID] = NULL,
445 [PERF_RECORD_HEADER_MAX] = NULL,
446 };
447
448 struct sample_queue {
449 u64 timestamp;
450 u64 file_offset;
451 union perf_event *event;
452 struct list_head list;
453 };
454
455 static void perf_session_free_sample_buffers(struct perf_session *session)
456 {
457 struct ordered_samples *os = &session->ordered_samples;
458
459 while (!list_empty(&os->to_free)) {
460 struct sample_queue *sq;
461
462 sq = list_entry(os->to_free.next, struct sample_queue, list);
463 list_del(&sq->list);
464 free(sq);
465 }
466 }
467
468 static int perf_session_deliver_event(struct perf_session *session,
469 union perf_event *event,
470 struct perf_sample *sample,
471 struct perf_event_ops *ops,
472 u64 file_offset);
473
474 static void flush_sample_queue(struct perf_session *s,
475 struct perf_event_ops *ops)
476 {
477 struct ordered_samples *os = &s->ordered_samples;
478 struct list_head *head = &os->samples;
479 struct sample_queue *tmp, *iter;
480 struct perf_sample sample;
481 u64 limit = os->next_flush;
482 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
483 int ret;
484
485 if (!ops->ordered_samples || !limit)
486 return;
487
488 list_for_each_entry_safe(iter, tmp, head, list) {
489 if (iter->timestamp > limit)
490 break;
491
492 ret = perf_session__parse_sample(s, iter->event, &sample);
493 if (ret)
494 pr_err("Can't parse sample, err = %d\n", ret);
495 else
496 perf_session_deliver_event(s, iter->event, &sample, ops,
497 iter->file_offset);
498
499 os->last_flush = iter->timestamp;
500 list_del(&iter->list);
501 list_add(&iter->list, &os->sample_cache);
502 }
503
504 if (list_empty(head)) {
505 os->last_sample = NULL;
506 } else if (last_ts <= limit) {
507 os->last_sample =
508 list_entry(head->prev, struct sample_queue, list);
509 }
510 }
511
512 /*
513 * When perf record finishes a pass on every buffers, it records this pseudo
514 * event.
515 * We record the max timestamp t found in the pass n.
516 * Assuming these timestamps are monotonic across cpus, we know that if
517 * a buffer still has events with timestamps below t, they will be all
518 * available and then read in the pass n + 1.
519 * Hence when we start to read the pass n + 2, we can safely flush every
520 * events with timestamps below t.
521 *
522 * ============ PASS n =================
523 * CPU 0 | CPU 1
524 * |
525 * cnt1 timestamps | cnt2 timestamps
526 * 1 | 2
527 * 2 | 3
528 * - | 4 <--- max recorded
529 *
530 * ============ PASS n + 1 ==============
531 * CPU 0 | CPU 1
532 * |
533 * cnt1 timestamps | cnt2 timestamps
534 * 3 | 5
535 * 4 | 6
536 * 5 | 7 <---- max recorded
537 *
538 * Flush every events below timestamp 4
539 *
540 * ============ PASS n + 2 ==============
541 * CPU 0 | CPU 1
542 * |
543 * cnt1 timestamps | cnt2 timestamps
544 * 6 | 8
545 * 7 | 9
546 * - | 10
547 *
548 * Flush every events below timestamp 7
549 * etc...
550 */
551 static int process_finished_round(union perf_event *event __used,
552 struct perf_session *session,
553 struct perf_event_ops *ops)
554 {
555 flush_sample_queue(session, ops);
556 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
557
558 return 0;
559 }
560
561 /* The queue is ordered by time */
562 static void __queue_event(struct sample_queue *new, struct perf_session *s)
563 {
564 struct ordered_samples *os = &s->ordered_samples;
565 struct sample_queue *sample = os->last_sample;
566 u64 timestamp = new->timestamp;
567 struct list_head *p;
568
569 os->last_sample = new;
570
571 if (!sample) {
572 list_add(&new->list, &os->samples);
573 os->max_timestamp = timestamp;
574 return;
575 }
576
577 /*
578 * last_sample might point to some random place in the list as it's
579 * the last queued event. We expect that the new event is close to
580 * this.
581 */
582 if (sample->timestamp <= timestamp) {
583 while (sample->timestamp <= timestamp) {
584 p = sample->list.next;
585 if (p == &os->samples) {
586 list_add_tail(&new->list, &os->samples);
587 os->max_timestamp = timestamp;
588 return;
589 }
590 sample = list_entry(p, struct sample_queue, list);
591 }
592 list_add_tail(&new->list, &sample->list);
593 } else {
594 while (sample->timestamp > timestamp) {
595 p = sample->list.prev;
596 if (p == &os->samples) {
597 list_add(&new->list, &os->samples);
598 return;
599 }
600 sample = list_entry(p, struct sample_queue, list);
601 }
602 list_add(&new->list, &sample->list);
603 }
604 }
605
606 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
607
608 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
609 struct perf_sample *sample, u64 file_offset)
610 {
611 struct ordered_samples *os = &s->ordered_samples;
612 struct list_head *sc = &os->sample_cache;
613 u64 timestamp = sample->time;
614 struct sample_queue *new;
615
616 if (!timestamp || timestamp == ~0ULL)
617 return -ETIME;
618
619 if (timestamp < s->ordered_samples.last_flush) {
620 printf("Warning: Timestamp below last timeslice flush\n");
621 return -EINVAL;
622 }
623
624 if (!list_empty(sc)) {
625 new = list_entry(sc->next, struct sample_queue, list);
626 list_del(&new->list);
627 } else if (os->sample_buffer) {
628 new = os->sample_buffer + os->sample_buffer_idx;
629 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
630 os->sample_buffer = NULL;
631 } else {
632 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
633 if (!os->sample_buffer)
634 return -ENOMEM;
635 list_add(&os->sample_buffer->list, &os->to_free);
636 os->sample_buffer_idx = 2;
637 new = os->sample_buffer + 1;
638 }
639
640 new->timestamp = timestamp;
641 new->file_offset = file_offset;
642 new->event = event;
643
644 __queue_event(new, s);
645
646 return 0;
647 }
648
649 static void callchain__printf(struct perf_sample *sample)
650 {
651 unsigned int i;
652
653 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
654
655 for (i = 0; i < sample->callchain->nr; i++)
656 printf("..... %2d: %016" PRIx64 "\n",
657 i, sample->callchain->ips[i]);
658 }
659
660 static void perf_session__print_tstamp(struct perf_session *session,
661 union perf_event *event,
662 struct perf_sample *sample)
663 {
664 if (event->header.type != PERF_RECORD_SAMPLE &&
665 !session->sample_id_all) {
666 fputs("-1 -1 ", stdout);
667 return;
668 }
669
670 if ((session->sample_type & PERF_SAMPLE_CPU))
671 printf("%u ", sample->cpu);
672
673 if (session->sample_type & PERF_SAMPLE_TIME)
674 printf("%" PRIu64 " ", sample->time);
675 }
676
677 static void dump_event(struct perf_session *session, union perf_event *event,
678 u64 file_offset, struct perf_sample *sample)
679 {
680 if (!dump_trace)
681 return;
682
683 printf("\n%#" PRIx64 " [%#x]: event: %d\n",
684 file_offset, event->header.size, event->header.type);
685
686 trace_event(event);
687
688 if (sample)
689 perf_session__print_tstamp(session, event, sample);
690
691 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
692 event->header.size, perf_event__name(event->header.type));
693 }
694
695 static void dump_sample(struct perf_session *session, union perf_event *event,
696 struct perf_sample *sample)
697 {
698 if (!dump_trace)
699 return;
700
701 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n",
702 event->header.misc, sample->pid, sample->tid, sample->ip,
703 sample->period);
704
705 if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
706 callchain__printf(sample);
707 }
708
709 static int perf_session_deliver_event(struct perf_session *session,
710 union perf_event *event,
711 struct perf_sample *sample,
712 struct perf_event_ops *ops,
713 u64 file_offset)
714 {
715 struct perf_evsel *evsel;
716
717 dump_event(session, event, file_offset, sample);
718
719 switch (event->header.type) {
720 case PERF_RECORD_SAMPLE:
721 dump_sample(session, event, sample);
722 evsel = perf_evlist__id2evsel(session->evlist, sample->id);
723 if (evsel == NULL) {
724 ++session->hists.stats.nr_unknown_id;
725 return -1;
726 }
727 return ops->sample(event, sample, evsel, session);
728 case PERF_RECORD_MMAP:
729 return ops->mmap(event, sample, session);
730 case PERF_RECORD_COMM:
731 return ops->comm(event, sample, session);
732 case PERF_RECORD_FORK:
733 return ops->fork(event, sample, session);
734 case PERF_RECORD_EXIT:
735 return ops->exit(event, sample, session);
736 case PERF_RECORD_LOST:
737 return ops->lost(event, sample, session);
738 case PERF_RECORD_READ:
739 return ops->read(event, sample, session);
740 case PERF_RECORD_THROTTLE:
741 return ops->throttle(event, sample, session);
742 case PERF_RECORD_UNTHROTTLE:
743 return ops->unthrottle(event, sample, session);
744 default:
745 ++session->hists.stats.nr_unknown_events;
746 return -1;
747 }
748 }
749
750 static int perf_session__preprocess_sample(struct perf_session *session,
751 union perf_event *event, struct perf_sample *sample)
752 {
753 if (event->header.type != PERF_RECORD_SAMPLE ||
754 !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
755 return 0;
756
757 if (!ip_callchain__valid(sample->callchain, event)) {
758 pr_debug("call-chain problem with event, skipping it.\n");
759 ++session->hists.stats.nr_invalid_chains;
760 session->hists.stats.total_invalid_chains += sample->period;
761 return -EINVAL;
762 }
763 return 0;
764 }
765
766 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
767 struct perf_event_ops *ops, u64 file_offset)
768 {
769 dump_event(session, event, file_offset, NULL);
770
771 /* These events are processed right away */
772 switch (event->header.type) {
773 case PERF_RECORD_HEADER_ATTR:
774 return ops->attr(event, session);
775 case PERF_RECORD_HEADER_EVENT_TYPE:
776 return ops->event_type(event, session);
777 case PERF_RECORD_HEADER_TRACING_DATA:
778 /* setup for reading amidst mmap */
779 lseek(session->fd, file_offset, SEEK_SET);
780 return ops->tracing_data(event, session);
781 case PERF_RECORD_HEADER_BUILD_ID:
782 return ops->build_id(event, session);
783 case PERF_RECORD_FINISHED_ROUND:
784 return ops->finished_round(event, session, ops);
785 default:
786 return -EINVAL;
787 }
788 }
789
790 static int perf_session__process_event(struct perf_session *session,
791 union perf_event *event,
792 struct perf_event_ops *ops,
793 u64 file_offset)
794 {
795 struct perf_sample sample;
796 int ret;
797
798 if (session->header.needs_swap &&
799 perf_event__swap_ops[event->header.type])
800 perf_event__swap_ops[event->header.type](event);
801
802 if (event->header.type >= PERF_RECORD_HEADER_MAX)
803 return -EINVAL;
804
805 hists__inc_nr_events(&session->hists, event->header.type);
806
807 if (event->header.type >= PERF_RECORD_USER_TYPE_START)
808 return perf_session__process_user_event(session, event, ops, file_offset);
809
810 /*
811 * For all kernel events we get the sample data
812 */
813 ret = perf_session__parse_sample(session, event, &sample);
814 if (ret)
815 return ret;
816
817 /* Preprocess sample records - precheck callchains */
818 if (perf_session__preprocess_sample(session, event, &sample))
819 return 0;
820
821 if (ops->ordered_samples) {
822 ret = perf_session_queue_event(session, event, &sample,
823 file_offset);
824 if (ret != -ETIME)
825 return ret;
826 }
827
828 return perf_session_deliver_event(session, event, &sample, ops,
829 file_offset);
830 }
831
832 void perf_event_header__bswap(struct perf_event_header *self)
833 {
834 self->type = bswap_32(self->type);
835 self->misc = bswap_16(self->misc);
836 self->size = bswap_16(self->size);
837 }
838
839 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
840 {
841 struct thread *thread = perf_session__findnew(self, 0);
842
843 if (thread == NULL || thread__set_comm(thread, "swapper")) {
844 pr_err("problem inserting idle task.\n");
845 thread = NULL;
846 }
847
848 return thread;
849 }
850
851 static void perf_session__warn_about_errors(const struct perf_session *session,
852 const struct perf_event_ops *ops)
853 {
854 if (ops->lost == perf_event__process_lost &&
855 session->hists.stats.total_lost != 0) {
856 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
857 "!\n\nCheck IO/CPU overload!\n\n",
858 session->hists.stats.total_period,
859 session->hists.stats.total_lost);
860 }
861
862 if (session->hists.stats.nr_unknown_events != 0) {
863 ui__warning("Found %u unknown events!\n\n"
864 "Is this an older tool processing a perf.data "
865 "file generated by a more recent tool?\n\n"
866 "If that is not the case, consider "
867 "reporting to linux-kernel@vger.kernel.org.\n\n",
868 session->hists.stats.nr_unknown_events);
869 }
870
871 if (session->hists.stats.nr_unknown_id != 0) {
872 ui__warning("%u samples with id not present in the header\n",
873 session->hists.stats.nr_unknown_id);
874 }
875
876 if (session->hists.stats.nr_invalid_chains != 0) {
877 ui__warning("Found invalid callchains!\n\n"
878 "%u out of %u events were discarded for this reason.\n\n"
879 "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
880 session->hists.stats.nr_invalid_chains,
881 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
882 }
883 }
884
885 #define session_done() (*(volatile int *)(&session_done))
886 volatile int session_done;
887
888 static int __perf_session__process_pipe_events(struct perf_session *self,
889 struct perf_event_ops *ops)
890 {
891 union perf_event event;
892 uint32_t size;
893 int skip = 0;
894 u64 head;
895 int err;
896 void *p;
897
898 perf_event_ops__fill_defaults(ops);
899
900 head = 0;
901 more:
902 err = readn(self->fd, &event, sizeof(struct perf_event_header));
903 if (err <= 0) {
904 if (err == 0)
905 goto done;
906
907 pr_err("failed to read event header\n");
908 goto out_err;
909 }
910
911 if (self->header.needs_swap)
912 perf_event_header__bswap(&event.header);
913
914 size = event.header.size;
915 if (size == 0)
916 size = 8;
917
918 p = &event;
919 p += sizeof(struct perf_event_header);
920
921 if (size - sizeof(struct perf_event_header)) {
922 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
923 if (err <= 0) {
924 if (err == 0) {
925 pr_err("unexpected end of event stream\n");
926 goto done;
927 }
928
929 pr_err("failed to read event data\n");
930 goto out_err;
931 }
932 }
933
934 if (size == 0 ||
935 (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
936 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
937 head, event.header.size, event.header.type);
938 /*
939 * assume we lost track of the stream, check alignment, and
940 * increment a single u64 in the hope to catch on again 'soon'.
941 */
942 if (unlikely(head & 7))
943 head &= ~7ULL;
944
945 size = 8;
946 }
947
948 head += size;
949
950 if (skip > 0)
951 head += skip;
952
953 if (!session_done())
954 goto more;
955 done:
956 err = 0;
957 out_err:
958 perf_session__warn_about_errors(self, ops);
959 perf_session_free_sample_buffers(self);
960 return err;
961 }
962
963 static union perf_event *
964 fetch_mmaped_event(struct perf_session *session,
965 u64 head, size_t mmap_size, char *buf)
966 {
967 union perf_event *event;
968
969 /*
970 * Ensure we have enough space remaining to read
971 * the size of the event in the headers.
972 */
973 if (head + sizeof(event->header) > mmap_size)
974 return NULL;
975
976 event = (union perf_event *)(buf + head);
977
978 if (session->header.needs_swap)
979 perf_event_header__bswap(&event->header);
980
981 if (head + event->header.size > mmap_size)
982 return NULL;
983
984 return event;
985 }
986
987 int __perf_session__process_events(struct perf_session *session,
988 u64 data_offset, u64 data_size,
989 u64 file_size, struct perf_event_ops *ops)
990 {
991 u64 head, page_offset, file_offset, file_pos, progress_next;
992 int err, mmap_prot, mmap_flags, map_idx = 0;
993 struct ui_progress *progress;
994 size_t page_size, mmap_size;
995 char *buf, *mmaps[8];
996 union perf_event *event;
997 uint32_t size;
998
999 perf_event_ops__fill_defaults(ops);
1000
1001 page_size = sysconf(_SC_PAGESIZE);
1002
1003 page_offset = page_size * (data_offset / page_size);
1004 file_offset = page_offset;
1005 head = data_offset - page_offset;
1006
1007 if (data_offset + data_size < file_size)
1008 file_size = data_offset + data_size;
1009
1010 progress_next = file_size / 16;
1011 progress = ui_progress__new("Processing events...", file_size);
1012 if (progress == NULL)
1013 return -1;
1014
1015 mmap_size = session->mmap_window;
1016 if (mmap_size > file_size)
1017 mmap_size = file_size;
1018
1019 memset(mmaps, 0, sizeof(mmaps));
1020
1021 mmap_prot = PROT_READ;
1022 mmap_flags = MAP_SHARED;
1023
1024 if (session->header.needs_swap) {
1025 mmap_prot |= PROT_WRITE;
1026 mmap_flags = MAP_PRIVATE;
1027 }
1028 remap:
1029 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1030 file_offset);
1031 if (buf == MAP_FAILED) {
1032 pr_err("failed to mmap file\n");
1033 err = -errno;
1034 goto out_err;
1035 }
1036 mmaps[map_idx] = buf;
1037 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1038 file_pos = file_offset + head;
1039
1040 more:
1041 event = fetch_mmaped_event(session, head, mmap_size, buf);
1042 if (!event) {
1043 if (mmaps[map_idx]) {
1044 munmap(mmaps[map_idx], mmap_size);
1045 mmaps[map_idx] = NULL;
1046 }
1047
1048 page_offset = page_size * (head / page_size);
1049 file_offset += page_offset;
1050 head -= page_offset;
1051 goto remap;
1052 }
1053
1054 size = event->header.size;
1055
1056 if (size == 0 ||
1057 perf_session__process_event(session, event, ops, file_pos) < 0) {
1058 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1059 file_offset + head, event->header.size,
1060 event->header.type);
1061 /*
1062 * assume we lost track of the stream, check alignment, and
1063 * increment a single u64 in the hope to catch on again 'soon'.
1064 */
1065 if (unlikely(head & 7))
1066 head &= ~7ULL;
1067
1068 size = 8;
1069 }
1070
1071 head += size;
1072 file_pos += size;
1073
1074 if (file_pos >= progress_next) {
1075 progress_next += file_size / 16;
1076 ui_progress__update(progress, file_pos);
1077 }
1078
1079 if (file_pos < file_size)
1080 goto more;
1081
1082 err = 0;
1083 /* do the final flush for ordered samples */
1084 session->ordered_samples.next_flush = ULLONG_MAX;
1085 flush_sample_queue(session, ops);
1086 out_err:
1087 ui_progress__delete(progress);
1088 perf_session__warn_about_errors(session, ops);
1089 perf_session_free_sample_buffers(session);
1090 return err;
1091 }
1092
1093 int perf_session__process_events(struct perf_session *self,
1094 struct perf_event_ops *ops)
1095 {
1096 int err;
1097
1098 if (perf_session__register_idle_thread(self) == NULL)
1099 return -ENOMEM;
1100
1101 if (!self->fd_pipe)
1102 err = __perf_session__process_events(self,
1103 self->header.data_offset,
1104 self->header.data_size,
1105 self->size, ops);
1106 else
1107 err = __perf_session__process_pipe_events(self, ops);
1108
1109 return err;
1110 }
1111
1112 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1113 {
1114 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1115 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1116 return false;
1117 }
1118
1119 return true;
1120 }
1121
1122 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
1123 const char *symbol_name,
1124 u64 addr)
1125 {
1126 char *bracket;
1127 enum map_type i;
1128 struct ref_reloc_sym *ref;
1129
1130 ref = zalloc(sizeof(struct ref_reloc_sym));
1131 if (ref == NULL)
1132 return -ENOMEM;
1133
1134 ref->name = strdup(symbol_name);
1135 if (ref->name == NULL) {
1136 free(ref);
1137 return -ENOMEM;
1138 }
1139
1140 bracket = strchr(ref->name, ']');
1141 if (bracket)
1142 *bracket = '\0';
1143
1144 ref->addr = addr;
1145
1146 for (i = 0; i < MAP__NR_TYPES; ++i) {
1147 struct kmap *kmap = map__kmap(maps[i]);
1148 kmap->ref_reloc_sym = ref;
1149 }
1150
1151 return 0;
1152 }
1153
1154 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1155 {
1156 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1157 __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1158 machines__fprintf_dsos(&self->machines, fp);
1159 }
1160
1161 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1162 bool with_hits)
1163 {
1164 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1165 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1166 }
1167
1168 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1169 {
1170 struct perf_evsel *pos;
1171 size_t ret = fprintf(fp, "Aggregated stats:\n");
1172
1173 ret += hists__fprintf_nr_events(&session->hists, fp);
1174
1175 list_for_each_entry(pos, &session->evlist->entries, node) {
1176 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1177 ret += hists__fprintf_nr_events(&pos->hists, fp);
1178 }
1179
1180 return ret;
1181 }
1182
1183 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1184 unsigned int type)
1185 {
1186 struct perf_evsel *pos;
1187
1188 list_for_each_entry(pos, &session->evlist->entries, node) {
1189 if (pos->attr.type == type)
1190 return pos;
1191 }
1192 return NULL;
1193 }
1194
1195 void perf_session__print_symbols(union perf_event *event,
1196 struct perf_sample *sample,
1197 struct perf_session *session)
1198 {
1199 struct addr_location al;
1200 const char *symname, *dsoname;
1201 struct callchain_cursor *cursor = &session->callchain_cursor;
1202 struct callchain_cursor_node *node;
1203
1204 if (perf_event__preprocess_sample(event, session, &al, sample,
1205 NULL) < 0) {
1206 error("problem processing %d event, skipping it.\n",
1207 event->header.type);
1208 return;
1209 }
1210
1211 if (symbol_conf.use_callchain && sample->callchain) {
1212
1213 if (perf_session__resolve_callchain(session, al.thread,
1214 sample->callchain, NULL) != 0) {
1215 if (verbose)
1216 error("Failed to resolve callchain. Skipping\n");
1217 return;
1218 }
1219 callchain_cursor_commit(cursor);
1220
1221 while (1) {
1222 node = callchain_cursor_current(cursor);
1223 if (!node)
1224 break;
1225
1226 if (node->sym && node->sym->name)
1227 symname = node->sym->name;
1228 else
1229 symname = "";
1230
1231 if (node->map && node->map->dso && node->map->dso->name)
1232 dsoname = node->map->dso->name;
1233 else
1234 dsoname = "";
1235
1236 printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname);
1237
1238 callchain_cursor_advance(cursor);
1239 }
1240
1241 } else {
1242 if (al.sym && al.sym->name)
1243 symname = al.sym->name;
1244 else
1245 symname = "";
1246
1247 if (al.map && al.map->dso && al.map->dso->name)
1248 dsoname = al.map->dso->name;
1249 else
1250 dsoname = "";
1251
1252 printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname);
1253 }
1254 }