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spi-topcliff-pch: supports a spi mode setup and bit order setup by IO control
[zen-stable.git] / tools / perf / util / session.c
blobb5ca2558c7bb34783c1e94026ece6ba2ad5f61f2
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 "tool.h"
14 #include "sort.h"
15 #include "util.h"
16 #include "cpumap.h"
17
18 static int perf_session__open(struct perf_session *self, bool force)
19 {
20 struct stat input_stat;
21
22 if (!strcmp(self->filename, "-")) {
23 self->fd_pipe = true;
24 self->fd = STDIN_FILENO;
25
26 if (perf_session__read_header(self, self->fd) < 0)
27 pr_err("incompatible file format");
28
29 return 0;
30 }
31
32 self->fd = open(self->filename, O_RDONLY);
33 if (self->fd < 0) {
34 int err = errno;
35
36 pr_err("failed to open %s: %s", self->filename, strerror(err));
37 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
38 pr_err(" (try 'perf record' first)");
39 pr_err("\n");
40 return -errno;
41 }
42
43 if (fstat(self->fd, &input_stat) < 0)
44 goto out_close;
45
46 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
47 pr_err("file %s not owned by current user or root\n",
48 self->filename);
49 goto out_close;
50 }
51
52 if (!input_stat.st_size) {
53 pr_info("zero-sized file (%s), nothing to do!\n",
54 self->filename);
55 goto out_close;
56 }
57
58 if (perf_session__read_header(self, self->fd) < 0) {
59 pr_err("incompatible file format");
60 goto out_close;
61 }
62
63 if (!perf_evlist__valid_sample_type(self->evlist)) {
64 pr_err("non matching sample_type");
65 goto out_close;
66 }
67
68 if (!perf_evlist__valid_sample_id_all(self->evlist)) {
69 pr_err("non matching sample_id_all");
70 goto out_close;
71 }
72
73 self->size = input_stat.st_size;
74 return 0;
75
76 out_close:
77 close(self->fd);
78 self->fd = -1;
79 return -1;
80 }
81
82 void perf_session__update_sample_type(struct perf_session *self)
83 {
84 self->sample_type = perf_evlist__sample_type(self->evlist);
85 self->sample_size = __perf_evsel__sample_size(self->sample_type);
86 self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
87 self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
88 self->host_machine.id_hdr_size = self->id_hdr_size;
89 }
90
91 int perf_session__create_kernel_maps(struct perf_session *self)
92 {
93 int ret = machine__create_kernel_maps(&self->host_machine);
94
95 if (ret >= 0)
96 ret = machines__create_guest_kernel_maps(&self->machines);
97 return ret;
98 }
99
100 static void perf_session__destroy_kernel_maps(struct perf_session *self)
101 {
102 machine__destroy_kernel_maps(&self->host_machine);
103 machines__destroy_guest_kernel_maps(&self->machines);
104 }
105
106 struct perf_session *perf_session__new(const char *filename, int mode,
107 bool force, bool repipe,
108 struct perf_tool *tool)
109 {
110 struct perf_session *self;
111 struct stat st;
112 size_t len;
113
114 if (!filename || !strlen(filename)) {
115 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
116 filename = "-";
117 else
118 filename = "perf.data";
119 }
120
121 len = strlen(filename);
122 self = zalloc(sizeof(*self) + len);
123
124 if (self == NULL)
125 goto out;
126
127 memcpy(self->filename, filename, len);
128 /*
129 * On 64bit we can mmap the data file in one go. No need for tiny mmap
130 * slices. On 32bit we use 32MB.
131 */
132 #if BITS_PER_LONG == 64
133 self->mmap_window = ULLONG_MAX;
134 #else
135 self->mmap_window = 32 * 1024 * 1024ULL;
136 #endif
137 self->machines = RB_ROOT;
138 self->repipe = repipe;
139 INIT_LIST_HEAD(&self->ordered_samples.samples);
140 INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
141 INIT_LIST_HEAD(&self->ordered_samples.to_free);
142 machine__init(&self->host_machine, "", HOST_KERNEL_ID);
143
144 if (mode == O_RDONLY) {
145 if (perf_session__open(self, force) < 0)
146 goto out_delete;
147 perf_session__update_sample_type(self);
148 } else if (mode == O_WRONLY) {
149 /*
150 * In O_RDONLY mode this will be performed when reading the
151 * kernel MMAP event, in perf_event__process_mmap().
152 */
153 if (perf_session__create_kernel_maps(self) < 0)
154 goto out_delete;
155 }
156
157 if (tool && tool->ordering_requires_timestamps &&
158 tool->ordered_samples && !self->sample_id_all) {
159 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
160 tool->ordered_samples = false;
161 }
162
163 out:
164 return self;
165 out_delete:
166 perf_session__delete(self);
167 return NULL;
168 }
169
170 static void machine__delete_dead_threads(struct machine *machine)
171 {
172 struct thread *n, *t;
173
174 list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
175 list_del(&t->node);
176 thread__delete(t);
177 }
178 }
179
180 static void perf_session__delete_dead_threads(struct perf_session *session)
181 {
182 machine__delete_dead_threads(&session->host_machine);
183 }
184
185 static void machine__delete_threads(struct machine *self)
186 {
187 struct rb_node *nd = rb_first(&self->threads);
188
189 while (nd) {
190 struct thread *t = rb_entry(nd, struct thread, rb_node);
191
192 rb_erase(&t->rb_node, &self->threads);
193 nd = rb_next(nd);
194 thread__delete(t);
195 }
196 }
197
198 static void perf_session__delete_threads(struct perf_session *session)
199 {
200 machine__delete_threads(&session->host_machine);
201 }
202
203 void perf_session__delete(struct perf_session *self)
204 {
205 perf_session__destroy_kernel_maps(self);
206 perf_session__delete_dead_threads(self);
207 perf_session__delete_threads(self);
208 machine__exit(&self->host_machine);
209 close(self->fd);
210 free(self);
211 }
212
213 void machine__remove_thread(struct machine *self, struct thread *th)
214 {
215 self->last_match = NULL;
216 rb_erase(&th->rb_node, &self->threads);
217 /*
218 * We may have references to this thread, for instance in some hist_entry
219 * instances, so just move them to a separate list.
220 */
221 list_add_tail(&th->node, &self->dead_threads);
222 }
223
224 static bool symbol__match_parent_regex(struct symbol *sym)
225 {
226 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
227 return 1;
228
229 return 0;
230 }
231
232 int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
233 struct thread *thread,
234 struct ip_callchain *chain,
235 struct symbol **parent)
236 {
237 u8 cpumode = PERF_RECORD_MISC_USER;
238 unsigned int i;
239 int err;
240
241 callchain_cursor_reset(&evsel->hists.callchain_cursor);
242
243 for (i = 0; i < chain->nr; i++) {
244 u64 ip;
245 struct addr_location al;
246
247 if (callchain_param.order == ORDER_CALLEE)
248 ip = chain->ips[i];
249 else
250 ip = chain->ips[chain->nr - i - 1];
251
252 if (ip >= PERF_CONTEXT_MAX) {
253 switch (ip) {
254 case PERF_CONTEXT_HV:
255 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
256 case PERF_CONTEXT_KERNEL:
257 cpumode = PERF_RECORD_MISC_KERNEL; break;
258 case PERF_CONTEXT_USER:
259 cpumode = PERF_RECORD_MISC_USER; break;
260 default:
261 break;
262 }
263 continue;
264 }
265
266 al.filtered = false;
267 thread__find_addr_location(thread, self, cpumode,
268 MAP__FUNCTION, ip, &al, NULL);
269 if (al.sym != NULL) {
270 if (sort__has_parent && !*parent &&
271 symbol__match_parent_regex(al.sym))
272 *parent = al.sym;
273 if (!symbol_conf.use_callchain)
274 break;
275 }
276
277 err = callchain_cursor_append(&evsel->hists.callchain_cursor,
278 ip, al.map, al.sym);
279 if (err)
280 return err;
281 }
282
283 return 0;
284 }
285
286 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
287 struct perf_session *session __used)
288 {
289 dump_printf(": unhandled!\n");
290 return 0;
291 }
292
293 static int process_event_synth_attr_stub(union perf_event *event __used,
294 struct perf_evlist **pevlist __used)
295 {
296 dump_printf(": unhandled!\n");
297 return 0;
298 }
299
300 static int process_event_sample_stub(struct perf_tool *tool __used,
301 union perf_event *event __used,
302 struct perf_sample *sample __used,
303 struct perf_evsel *evsel __used,
304 struct machine *machine __used)
305 {
306 dump_printf(": unhandled!\n");
307 return 0;
308 }
309
310 static int process_event_stub(struct perf_tool *tool __used,
311 union perf_event *event __used,
312 struct perf_sample *sample __used,
313 struct machine *machine __used)
314 {
315 dump_printf(": unhandled!\n");
316 return 0;
317 }
318
319 static int process_finished_round_stub(struct perf_tool *tool __used,
320 union perf_event *event __used,
321 struct perf_session *perf_session __used)
322 {
323 dump_printf(": unhandled!\n");
324 return 0;
325 }
326
327 static int process_event_type_stub(struct perf_tool *tool __used,
328 union perf_event *event __used)
329 {
330 dump_printf(": unhandled!\n");
331 return 0;
332 }
333
334 static int process_finished_round(struct perf_tool *tool,
335 union perf_event *event,
336 struct perf_session *session);
337
338 static void perf_tool__fill_defaults(struct perf_tool *tool)
339 {
340 if (tool->sample == NULL)
341 tool->sample = process_event_sample_stub;
342 if (tool->mmap == NULL)
343 tool->mmap = process_event_stub;
344 if (tool->comm == NULL)
345 tool->comm = process_event_stub;
346 if (tool->fork == NULL)
347 tool->fork = process_event_stub;
348 if (tool->exit == NULL)
349 tool->exit = process_event_stub;
350 if (tool->lost == NULL)
351 tool->lost = perf_event__process_lost;
352 if (tool->read == NULL)
353 tool->read = process_event_sample_stub;
354 if (tool->throttle == NULL)
355 tool->throttle = process_event_stub;
356 if (tool->unthrottle == NULL)
357 tool->unthrottle = process_event_stub;
358 if (tool->attr == NULL)
359 tool->attr = process_event_synth_attr_stub;
360 if (tool->event_type == NULL)
361 tool->event_type = process_event_type_stub;
362 if (tool->tracing_data == NULL)
363 tool->tracing_data = process_event_synth_tracing_data_stub;
364 if (tool->build_id == NULL)
365 tool->build_id = process_finished_round_stub;
366 if (tool->finished_round == NULL) {
367 if (tool->ordered_samples)
368 tool->finished_round = process_finished_round;
369 else
370 tool->finished_round = process_finished_round_stub;
371 }
372 }
373
374 void mem_bswap_64(void *src, int byte_size)
375 {
376 u64 *m = src;
377
378 while (byte_size > 0) {
379 *m = bswap_64(*m);
380 byte_size -= sizeof(u64);
381 ++m;
382 }
383 }
384
385 static void perf_event__all64_swap(union perf_event *event)
386 {
387 struct perf_event_header *hdr = &event->header;
388 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
389 }
390
391 static void perf_event__comm_swap(union perf_event *event)
392 {
393 event->comm.pid = bswap_32(event->comm.pid);
394 event->comm.tid = bswap_32(event->comm.tid);
395 }
396
397 static void perf_event__mmap_swap(union perf_event *event)
398 {
399 event->mmap.pid = bswap_32(event->mmap.pid);
400 event->mmap.tid = bswap_32(event->mmap.tid);
401 event->mmap.start = bswap_64(event->mmap.start);
402 event->mmap.len = bswap_64(event->mmap.len);
403 event->mmap.pgoff = bswap_64(event->mmap.pgoff);
404 }
405
406 static void perf_event__task_swap(union perf_event *event)
407 {
408 event->fork.pid = bswap_32(event->fork.pid);
409 event->fork.tid = bswap_32(event->fork.tid);
410 event->fork.ppid = bswap_32(event->fork.ppid);
411 event->fork.ptid = bswap_32(event->fork.ptid);
412 event->fork.time = bswap_64(event->fork.time);
413 }
414
415 static void perf_event__read_swap(union perf_event *event)
416 {
417 event->read.pid = bswap_32(event->read.pid);
418 event->read.tid = bswap_32(event->read.tid);
419 event->read.value = bswap_64(event->read.value);
420 event->read.time_enabled = bswap_64(event->read.time_enabled);
421 event->read.time_running = bswap_64(event->read.time_running);
422 event->read.id = bswap_64(event->read.id);
423 }
424
425 /* exported for swapping attributes in file header */
426 void perf_event__attr_swap(struct perf_event_attr *attr)
427 {
428 attr->type = bswap_32(attr->type);
429 attr->size = bswap_32(attr->size);
430 attr->config = bswap_64(attr->config);
431 attr->sample_period = bswap_64(attr->sample_period);
432 attr->sample_type = bswap_64(attr->sample_type);
433 attr->read_format = bswap_64(attr->read_format);
434 attr->wakeup_events = bswap_32(attr->wakeup_events);
435 attr->bp_type = bswap_32(attr->bp_type);
436 attr->bp_addr = bswap_64(attr->bp_addr);
437 attr->bp_len = bswap_64(attr->bp_len);
438 }
439
440 static void perf_event__hdr_attr_swap(union perf_event *event)
441 {
442 size_t size;
443
444 perf_event__attr_swap(&event->attr.attr);
445
446 size = event->header.size;
447 size -= (void *)&event->attr.id - (void *)event;
448 mem_bswap_64(event->attr.id, size);
449 }
450
451 static void perf_event__event_type_swap(union perf_event *event)
452 {
453 event->event_type.event_type.event_id =
454 bswap_64(event->event_type.event_type.event_id);
455 }
456
457 static void perf_event__tracing_data_swap(union perf_event *event)
458 {
459 event->tracing_data.size = bswap_32(event->tracing_data.size);
460 }
461
462 typedef void (*perf_event__swap_op)(union perf_event *event);
463
464 static perf_event__swap_op perf_event__swap_ops[] = {
465 [PERF_RECORD_MMAP] = perf_event__mmap_swap,
466 [PERF_RECORD_COMM] = perf_event__comm_swap,
467 [PERF_RECORD_FORK] = perf_event__task_swap,
468 [PERF_RECORD_EXIT] = perf_event__task_swap,
469 [PERF_RECORD_LOST] = perf_event__all64_swap,
470 [PERF_RECORD_READ] = perf_event__read_swap,
471 [PERF_RECORD_SAMPLE] = perf_event__all64_swap,
472 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap,
473 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap,
474 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
475 [PERF_RECORD_HEADER_BUILD_ID] = NULL,
476 [PERF_RECORD_HEADER_MAX] = NULL,
477 };
478
479 struct sample_queue {
480 u64 timestamp;
481 u64 file_offset;
482 union perf_event *event;
483 struct list_head list;
484 };
485
486 static void perf_session_free_sample_buffers(struct perf_session *session)
487 {
488 struct ordered_samples *os = &session->ordered_samples;
489
490 while (!list_empty(&os->to_free)) {
491 struct sample_queue *sq;
492
493 sq = list_entry(os->to_free.next, struct sample_queue, list);
494 list_del(&sq->list);
495 free(sq);
496 }
497 }
498
499 static int perf_session_deliver_event(struct perf_session *session,
500 union perf_event *event,
501 struct perf_sample *sample,
502 struct perf_tool *tool,
503 u64 file_offset);
504
505 static void flush_sample_queue(struct perf_session *s,
506 struct perf_tool *tool)
507 {
508 struct ordered_samples *os = &s->ordered_samples;
509 struct list_head *head = &os->samples;
510 struct sample_queue *tmp, *iter;
511 struct perf_sample sample;
512 u64 limit = os->next_flush;
513 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
514 unsigned idx = 0, progress_next = os->nr_samples / 16;
515 int ret;
516
517 if (!tool->ordered_samples || !limit)
518 return;
519
520 list_for_each_entry_safe(iter, tmp, head, list) {
521 if (iter->timestamp > limit)
522 break;
523
524 ret = perf_session__parse_sample(s, iter->event, &sample);
525 if (ret)
526 pr_err("Can't parse sample, err = %d\n", ret);
527 else
528 perf_session_deliver_event(s, iter->event, &sample, tool,
529 iter->file_offset);
530
531 os->last_flush = iter->timestamp;
532 list_del(&iter->list);
533 list_add(&iter->list, &os->sample_cache);
534 if (++idx >= progress_next) {
535 progress_next += os->nr_samples / 16;
536 ui_progress__update(idx, os->nr_samples,
537 "Processing time ordered events...");
538 }
539 }
540
541 if (list_empty(head)) {
542 os->last_sample = NULL;
543 } else if (last_ts <= limit) {
544 os->last_sample =
545 list_entry(head->prev, struct sample_queue, list);
546 }
547
548 os->nr_samples = 0;
549 }
550
551 /*
552 * When perf record finishes a pass on every buffers, it records this pseudo
553 * event.
554 * We record the max timestamp t found in the pass n.
555 * Assuming these timestamps are monotonic across cpus, we know that if
556 * a buffer still has events with timestamps below t, they will be all
557 * available and then read in the pass n + 1.
558 * Hence when we start to read the pass n + 2, we can safely flush every
559 * events with timestamps below t.
560 *
561 * ============ PASS n =================
562 * CPU 0 | CPU 1
563 * |
564 * cnt1 timestamps | cnt2 timestamps
565 * 1 | 2
566 * 2 | 3
567 * - | 4 <--- max recorded
568 *
569 * ============ PASS n + 1 ==============
570 * CPU 0 | CPU 1
571 * |
572 * cnt1 timestamps | cnt2 timestamps
573 * 3 | 5
574 * 4 | 6
575 * 5 | 7 <---- max recorded
576 *
577 * Flush every events below timestamp 4
578 *
579 * ============ PASS n + 2 ==============
580 * CPU 0 | CPU 1
581 * |
582 * cnt1 timestamps | cnt2 timestamps
583 * 6 | 8
584 * 7 | 9
585 * - | 10
586 *
587 * Flush every events below timestamp 7
588 * etc...
589 */
590 static int process_finished_round(struct perf_tool *tool,
591 union perf_event *event __used,
592 struct perf_session *session)
593 {
594 flush_sample_queue(session, tool);
595 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
596
597 return 0;
598 }
599
600 /* The queue is ordered by time */
601 static void __queue_event(struct sample_queue *new, struct perf_session *s)
602 {
603 struct ordered_samples *os = &s->ordered_samples;
604 struct sample_queue *sample = os->last_sample;
605 u64 timestamp = new->timestamp;
606 struct list_head *p;
607
608 ++os->nr_samples;
609 os->last_sample = new;
610
611 if (!sample) {
612 list_add(&new->list, &os->samples);
613 os->max_timestamp = timestamp;
614 return;
615 }
616
617 /*
618 * last_sample might point to some random place in the list as it's
619 * the last queued event. We expect that the new event is close to
620 * this.
621 */
622 if (sample->timestamp <= timestamp) {
623 while (sample->timestamp <= timestamp) {
624 p = sample->list.next;
625 if (p == &os->samples) {
626 list_add_tail(&new->list, &os->samples);
627 os->max_timestamp = timestamp;
628 return;
629 }
630 sample = list_entry(p, struct sample_queue, list);
631 }
632 list_add_tail(&new->list, &sample->list);
633 } else {
634 while (sample->timestamp > timestamp) {
635 p = sample->list.prev;
636 if (p == &os->samples) {
637 list_add(&new->list, &os->samples);
638 return;
639 }
640 sample = list_entry(p, struct sample_queue, list);
641 }
642 list_add(&new->list, &sample->list);
643 }
644 }
645
646 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
647
648 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
649 struct perf_sample *sample, u64 file_offset)
650 {
651 struct ordered_samples *os = &s->ordered_samples;
652 struct list_head *sc = &os->sample_cache;
653 u64 timestamp = sample->time;
654 struct sample_queue *new;
655
656 if (!timestamp || timestamp == ~0ULL)
657 return -ETIME;
658
659 if (timestamp < s->ordered_samples.last_flush) {
660 printf("Warning: Timestamp below last timeslice flush\n");
661 return -EINVAL;
662 }
663
664 if (!list_empty(sc)) {
665 new = list_entry(sc->next, struct sample_queue, list);
666 list_del(&new->list);
667 } else if (os->sample_buffer) {
668 new = os->sample_buffer + os->sample_buffer_idx;
669 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
670 os->sample_buffer = NULL;
671 } else {
672 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
673 if (!os->sample_buffer)
674 return -ENOMEM;
675 list_add(&os->sample_buffer->list, &os->to_free);
676 os->sample_buffer_idx = 2;
677 new = os->sample_buffer + 1;
678 }
679
680 new->timestamp = timestamp;
681 new->file_offset = file_offset;
682 new->event = event;
683
684 __queue_event(new, s);
685
686 return 0;
687 }
688
689 static void callchain__printf(struct perf_sample *sample)
690 {
691 unsigned int i;
692
693 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
694
695 for (i = 0; i < sample->callchain->nr; i++)
696 printf("..... %2d: %016" PRIx64 "\n",
697 i, sample->callchain->ips[i]);
698 }
699
700 static void perf_session__print_tstamp(struct perf_session *session,
701 union perf_event *event,
702 struct perf_sample *sample)
703 {
704 if (event->header.type != PERF_RECORD_SAMPLE &&
705 !session->sample_id_all) {
706 fputs("-1 -1 ", stdout);
707 return;
708 }
709
710 if ((session->sample_type & PERF_SAMPLE_CPU))
711 printf("%u ", sample->cpu);
712
713 if (session->sample_type & PERF_SAMPLE_TIME)
714 printf("%" PRIu64 " ", sample->time);
715 }
716
717 static void dump_event(struct perf_session *session, union perf_event *event,
718 u64 file_offset, struct perf_sample *sample)
719 {
720 if (!dump_trace)
721 return;
722
723 printf("\n%#" PRIx64 " [%#x]: event: %d\n",
724 file_offset, event->header.size, event->header.type);
725
726 trace_event(event);
727
728 if (sample)
729 perf_session__print_tstamp(session, event, sample);
730
731 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
732 event->header.size, perf_event__name(event->header.type));
733 }
734
735 static void dump_sample(struct perf_session *session, union perf_event *event,
736 struct perf_sample *sample)
737 {
738 if (!dump_trace)
739 return;
740
741 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
742 event->header.misc, sample->pid, sample->tid, sample->ip,
743 sample->period, sample->addr);
744
745 if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
746 callchain__printf(sample);
747 }
748
749 static struct machine *
750 perf_session__find_machine_for_cpumode(struct perf_session *session,
751 union perf_event *event)
752 {
753 const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
754
755 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest)
756 return perf_session__find_machine(session, event->ip.pid);
757
758 return perf_session__find_host_machine(session);
759 }
760
761 static int perf_session_deliver_event(struct perf_session *session,
762 union perf_event *event,
763 struct perf_sample *sample,
764 struct perf_tool *tool,
765 u64 file_offset)
766 {
767 struct perf_evsel *evsel;
768 struct machine *machine;
769
770 dump_event(session, event, file_offset, sample);
771
772 evsel = perf_evlist__id2evsel(session->evlist, sample->id);
773 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
774 /*
775 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
776 * because the tools right now may apply filters, discarding
777 * some of the samples. For consistency, in the future we
778 * should have something like nr_filtered_samples and remove
779 * the sample->period from total_sample_period, etc, KISS for
780 * now tho.
781 *
782 * Also testing against NULL allows us to handle files without
783 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
784 * future probably it'll be a good idea to restrict event
785 * processing via perf_session to files with both set.
786 */
787 hists__inc_nr_events(&evsel->hists, event->header.type);
788 }
789
790 machine = perf_session__find_machine_for_cpumode(session, event);
791
792 switch (event->header.type) {
793 case PERF_RECORD_SAMPLE:
794 dump_sample(session, event, sample);
795 if (evsel == NULL) {
796 ++session->hists.stats.nr_unknown_id;
797 return -1;
798 }
799 return tool->sample(tool, event, sample, evsel, machine);
800 case PERF_RECORD_MMAP:
801 return tool->mmap(tool, event, sample, machine);
802 case PERF_RECORD_COMM:
803 return tool->comm(tool, event, sample, machine);
804 case PERF_RECORD_FORK:
805 return tool->fork(tool, event, sample, machine);
806 case PERF_RECORD_EXIT:
807 return tool->exit(tool, event, sample, machine);
808 case PERF_RECORD_LOST:
809 if (tool->lost == perf_event__process_lost)
810 session->hists.stats.total_lost += event->lost.lost;
811 return tool->lost(tool, event, sample, machine);
812 case PERF_RECORD_READ:
813 return tool->read(tool, event, sample, evsel, machine);
814 case PERF_RECORD_THROTTLE:
815 return tool->throttle(tool, event, sample, machine);
816 case PERF_RECORD_UNTHROTTLE:
817 return tool->unthrottle(tool, event, sample, machine);
818 default:
819 ++session->hists.stats.nr_unknown_events;
820 return -1;
821 }
822 }
823
824 static int perf_session__preprocess_sample(struct perf_session *session,
825 union perf_event *event, struct perf_sample *sample)
826 {
827 if (event->header.type != PERF_RECORD_SAMPLE ||
828 !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
829 return 0;
830
831 if (!ip_callchain__valid(sample->callchain, event)) {
832 pr_debug("call-chain problem with event, skipping it.\n");
833 ++session->hists.stats.nr_invalid_chains;
834 session->hists.stats.total_invalid_chains += sample->period;
835 return -EINVAL;
836 }
837 return 0;
838 }
839
840 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
841 struct perf_tool *tool, u64 file_offset)
842 {
843 int err;
844
845 dump_event(session, event, file_offset, NULL);
846
847 /* These events are processed right away */
848 switch (event->header.type) {
849 case PERF_RECORD_HEADER_ATTR:
850 err = tool->attr(event, &session->evlist);
851 if (err == 0)
852 perf_session__update_sample_type(session);
853 return err;
854 case PERF_RECORD_HEADER_EVENT_TYPE:
855 return tool->event_type(tool, event);
856 case PERF_RECORD_HEADER_TRACING_DATA:
857 /* setup for reading amidst mmap */
858 lseek(session->fd, file_offset, SEEK_SET);
859 return tool->tracing_data(event, session);
860 case PERF_RECORD_HEADER_BUILD_ID:
861 return tool->build_id(tool, event, session);
862 case PERF_RECORD_FINISHED_ROUND:
863 return tool->finished_round(tool, event, session);
864 default:
865 return -EINVAL;
866 }
867 }
868
869 static int perf_session__process_event(struct perf_session *session,
870 union perf_event *event,
871 struct perf_tool *tool,
872 u64 file_offset)
873 {
874 struct perf_sample sample;
875 int ret;
876
877 if (session->header.needs_swap &&
878 perf_event__swap_ops[event->header.type])
879 perf_event__swap_ops[event->header.type](event);
880
881 if (event->header.type >= PERF_RECORD_HEADER_MAX)
882 return -EINVAL;
883
884 hists__inc_nr_events(&session->hists, event->header.type);
885
886 if (event->header.type >= PERF_RECORD_USER_TYPE_START)
887 return perf_session__process_user_event(session, event, tool, file_offset);
888
889 /*
890 * For all kernel events we get the sample data
891 */
892 ret = perf_session__parse_sample(session, event, &sample);
893 if (ret)
894 return ret;
895
896 /* Preprocess sample records - precheck callchains */
897 if (perf_session__preprocess_sample(session, event, &sample))
898 return 0;
899
900 if (tool->ordered_samples) {
901 ret = perf_session_queue_event(session, event, &sample,
902 file_offset);
903 if (ret != -ETIME)
904 return ret;
905 }
906
907 return perf_session_deliver_event(session, event, &sample, tool,
908 file_offset);
909 }
910
911 void perf_event_header__bswap(struct perf_event_header *self)
912 {
913 self->type = bswap_32(self->type);
914 self->misc = bswap_16(self->misc);
915 self->size = bswap_16(self->size);
916 }
917
918 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
919 {
920 return machine__findnew_thread(&session->host_machine, pid);
921 }
922
923 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
924 {
925 struct thread *thread = perf_session__findnew(self, 0);
926
927 if (thread == NULL || thread__set_comm(thread, "swapper")) {
928 pr_err("problem inserting idle task.\n");
929 thread = NULL;
930 }
931
932 return thread;
933 }
934
935 static void perf_session__warn_about_errors(const struct perf_session *session,
936 const struct perf_tool *tool)
937 {
938 if (tool->lost == perf_event__process_lost &&
939 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
940 ui__warning("Processed %d events and lost %d chunks!\n\n"
941 "Check IO/CPU overload!\n\n",
942 session->hists.stats.nr_events[0],
943 session->hists.stats.nr_events[PERF_RECORD_LOST]);
944 }
945
946 if (session->hists.stats.nr_unknown_events != 0) {
947 ui__warning("Found %u unknown events!\n\n"
948 "Is this an older tool processing a perf.data "
949 "file generated by a more recent tool?\n\n"
950 "If that is not the case, consider "
951 "reporting to linux-kernel@vger.kernel.org.\n\n",
952 session->hists.stats.nr_unknown_events);
953 }
954
955 if (session->hists.stats.nr_unknown_id != 0) {
956 ui__warning("%u samples with id not present in the header\n",
957 session->hists.stats.nr_unknown_id);
958 }
959
960 if (session->hists.stats.nr_invalid_chains != 0) {
961 ui__warning("Found invalid callchains!\n\n"
962 "%u out of %u events were discarded for this reason.\n\n"
963 "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
964 session->hists.stats.nr_invalid_chains,
965 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
966 }
967 }
968
969 #define session_done() (*(volatile int *)(&session_done))
970 volatile int session_done;
971
972 static int __perf_session__process_pipe_events(struct perf_session *self,
973 struct perf_tool *tool)
974 {
975 union perf_event event;
976 uint32_t size;
977 int skip = 0;
978 u64 head;
979 int err;
980 void *p;
981
982 perf_tool__fill_defaults(tool);
983
984 head = 0;
985 more:
986 err = readn(self->fd, &event, sizeof(struct perf_event_header));
987 if (err <= 0) {
988 if (err == 0)
989 goto done;
990
991 pr_err("failed to read event header\n");
992 goto out_err;
993 }
994
995 if (self->header.needs_swap)
996 perf_event_header__bswap(&event.header);
997
998 size = event.header.size;
999 if (size == 0)
1000 size = 8;
1001
1002 p = &event;
1003 p += sizeof(struct perf_event_header);
1004
1005 if (size - sizeof(struct perf_event_header)) {
1006 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1007 if (err <= 0) {
1008 if (err == 0) {
1009 pr_err("unexpected end of event stream\n");
1010 goto done;
1011 }
1012
1013 pr_err("failed to read event data\n");
1014 goto out_err;
1015 }
1016 }
1017
1018 if ((skip = perf_session__process_event(self, &event, tool, head)) < 0) {
1019 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1020 head, event.header.size, event.header.type);
1021 /*
1022 * assume we lost track of the stream, check alignment, and
1023 * increment a single u64 in the hope to catch on again 'soon'.
1024 */
1025 if (unlikely(head & 7))
1026 head &= ~7ULL;
1027
1028 size = 8;
1029 }
1030
1031 head += size;
1032
1033 if (skip > 0)
1034 head += skip;
1035
1036 if (!session_done())
1037 goto more;
1038 done:
1039 err = 0;
1040 out_err:
1041 perf_session__warn_about_errors(self, tool);
1042 perf_session_free_sample_buffers(self);
1043 return err;
1044 }
1045
1046 static union perf_event *
1047 fetch_mmaped_event(struct perf_session *session,
1048 u64 head, size_t mmap_size, char *buf)
1049 {
1050 union perf_event *event;
1051
1052 /*
1053 * Ensure we have enough space remaining to read
1054 * the size of the event in the headers.
1055 */
1056 if (head + sizeof(event->header) > mmap_size)
1057 return NULL;
1058
1059 event = (union perf_event *)(buf + head);
1060
1061 if (session->header.needs_swap)
1062 perf_event_header__bswap(&event->header);
1063
1064 if (head + event->header.size > mmap_size)
1065 return NULL;
1066
1067 return event;
1068 }
1069
1070 int __perf_session__process_events(struct perf_session *session,
1071 u64 data_offset, u64 data_size,
1072 u64 file_size, struct perf_tool *tool)
1073 {
1074 u64 head, page_offset, file_offset, file_pos, progress_next;
1075 int err, mmap_prot, mmap_flags, map_idx = 0;
1076 size_t page_size, mmap_size;
1077 char *buf, *mmaps[8];
1078 union perf_event *event;
1079 uint32_t size;
1080
1081 perf_tool__fill_defaults(tool);
1082
1083 page_size = sysconf(_SC_PAGESIZE);
1084
1085 page_offset = page_size * (data_offset / page_size);
1086 file_offset = page_offset;
1087 head = data_offset - page_offset;
1088
1089 if (data_offset + data_size < file_size)
1090 file_size = data_offset + data_size;
1091
1092 progress_next = file_size / 16;
1093
1094 mmap_size = session->mmap_window;
1095 if (mmap_size > file_size)
1096 mmap_size = file_size;
1097
1098 memset(mmaps, 0, sizeof(mmaps));
1099
1100 mmap_prot = PROT_READ;
1101 mmap_flags = MAP_SHARED;
1102
1103 if (session->header.needs_swap) {
1104 mmap_prot |= PROT_WRITE;
1105 mmap_flags = MAP_PRIVATE;
1106 }
1107 remap:
1108 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1109 file_offset);
1110 if (buf == MAP_FAILED) {
1111 pr_err("failed to mmap file\n");
1112 err = -errno;
1113 goto out_err;
1114 }
1115 mmaps[map_idx] = buf;
1116 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1117 file_pos = file_offset + head;
1118
1119 more:
1120 event = fetch_mmaped_event(session, head, mmap_size, buf);
1121 if (!event) {
1122 if (mmaps[map_idx]) {
1123 munmap(mmaps[map_idx], mmap_size);
1124 mmaps[map_idx] = NULL;
1125 }
1126
1127 page_offset = page_size * (head / page_size);
1128 file_offset += page_offset;
1129 head -= page_offset;
1130 goto remap;
1131 }
1132
1133 size = event->header.size;
1134
1135 if (size == 0 ||
1136 perf_session__process_event(session, event, tool, file_pos) < 0) {
1137 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1138 file_offset + head, event->header.size,
1139 event->header.type);
1140 /*
1141 * assume we lost track of the stream, check alignment, and
1142 * increment a single u64 in the hope to catch on again 'soon'.
1143 */
1144 if (unlikely(head & 7))
1145 head &= ~7ULL;
1146
1147 size = 8;
1148 }
1149
1150 head += size;
1151 file_pos += size;
1152
1153 if (file_pos >= progress_next) {
1154 progress_next += file_size / 16;
1155 ui_progress__update(file_pos, file_size,
1156 "Processing events...");
1157 }
1158
1159 if (file_pos < file_size)
1160 goto more;
1161
1162 err = 0;
1163 /* do the final flush for ordered samples */
1164 session->ordered_samples.next_flush = ULLONG_MAX;
1165 flush_sample_queue(session, tool);
1166 out_err:
1167 perf_session__warn_about_errors(session, tool);
1168 perf_session_free_sample_buffers(session);
1169 return err;
1170 }
1171
1172 int perf_session__process_events(struct perf_session *self,
1173 struct perf_tool *tool)
1174 {
1175 int err;
1176
1177 if (perf_session__register_idle_thread(self) == NULL)
1178 return -ENOMEM;
1179
1180 if (!self->fd_pipe)
1181 err = __perf_session__process_events(self,
1182 self->header.data_offset,
1183 self->header.data_size,
1184 self->size, tool);
1185 else
1186 err = __perf_session__process_pipe_events(self, tool);
1187
1188 return err;
1189 }
1190
1191 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1192 {
1193 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1194 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1195 return false;
1196 }
1197
1198 return true;
1199 }
1200
1201 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1202 const char *symbol_name, u64 addr)
1203 {
1204 char *bracket;
1205 enum map_type i;
1206 struct ref_reloc_sym *ref;
1207
1208 ref = zalloc(sizeof(struct ref_reloc_sym));
1209 if (ref == NULL)
1210 return -ENOMEM;
1211
1212 ref->name = strdup(symbol_name);
1213 if (ref->name == NULL) {
1214 free(ref);
1215 return -ENOMEM;
1216 }
1217
1218 bracket = strchr(ref->name, ']');
1219 if (bracket)
1220 *bracket = '\0';
1221
1222 ref->addr = addr;
1223
1224 for (i = 0; i < MAP__NR_TYPES; ++i) {
1225 struct kmap *kmap = map__kmap(maps[i]);
1226 kmap->ref_reloc_sym = ref;
1227 }
1228
1229 return 0;
1230 }
1231
1232 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1233 {
1234 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1235 __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1236 machines__fprintf_dsos(&self->machines, fp);
1237 }
1238
1239 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1240 bool with_hits)
1241 {
1242 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1243 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1244 }
1245
1246 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1247 {
1248 struct perf_evsel *pos;
1249 size_t ret = fprintf(fp, "Aggregated stats:\n");
1250
1251 ret += hists__fprintf_nr_events(&session->hists, fp);
1252
1253 list_for_each_entry(pos, &session->evlist->entries, node) {
1254 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1255 ret += hists__fprintf_nr_events(&pos->hists, fp);
1256 }
1257
1258 return ret;
1259 }
1260
1261 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1262 {
1263 /*
1264 * FIXME: Here we have to actually print all the machines in this
1265 * session, not just the host...
1266 */
1267 return machine__fprintf(&session->host_machine, fp);
1268 }
1269
1270 void perf_session__remove_thread(struct perf_session *session,
1271 struct thread *th)
1272 {
1273 /*
1274 * FIXME: This one makes no sense, we need to remove the thread from
1275 * the machine it belongs to, perf_session can have many machines, so
1276 * doing it always on ->host_machine is wrong. Fix when auditing all
1277 * the 'perf kvm' code.
1278 */
1279 machine__remove_thread(&session->host_machine, th);
1280 }
1281
1282 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1283 unsigned int type)
1284 {
1285 struct perf_evsel *pos;
1286
1287 list_for_each_entry(pos, &session->evlist->entries, node) {
1288 if (pos->attr.type == type)
1289 return pos;
1290 }
1291 return NULL;
1292 }
1293
1294 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1295 struct machine *machine, struct perf_evsel *evsel,
1296 int print_sym, int print_dso)
1297 {
1298 struct addr_location al;
1299 const char *symname, *dsoname;
1300 struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
1301 struct callchain_cursor_node *node;
1302
1303 if (perf_event__preprocess_sample(event, machine, &al, sample,
1304 NULL) < 0) {
1305 error("problem processing %d event, skipping it.\n",
1306 event->header.type);
1307 return;
1308 }
1309
1310 if (symbol_conf.use_callchain && sample->callchain) {
1311
1312 if (machine__resolve_callchain(machine, evsel, al.thread,
1313 sample->callchain, NULL) != 0) {
1314 if (verbose)
1315 error("Failed to resolve callchain. Skipping\n");
1316 return;
1317 }
1318 callchain_cursor_commit(cursor);
1319
1320 while (1) {
1321 node = callchain_cursor_current(cursor);
1322 if (!node)
1323 break;
1324
1325 printf("\t%16" PRIx64, node->ip);
1326 if (print_sym) {
1327 if (node->sym && node->sym->name)
1328 symname = node->sym->name;
1329 else
1330 symname = "";
1331
1332 printf(" %s", symname);
1333 }
1334 if (print_dso) {
1335 if (node->map && node->map->dso && node->map->dso->name)
1336 dsoname = node->map->dso->name;
1337 else
1338 dsoname = "";
1339
1340 printf(" (%s)", dsoname);
1341 }
1342 printf("\n");
1343
1344 callchain_cursor_advance(cursor);
1345 }
1346
1347 } else {
1348 printf("%16" PRIx64, sample->ip);
1349 if (print_sym) {
1350 if (al.sym && al.sym->name)
1351 symname = al.sym->name;
1352 else
1353 symname = "";
1354
1355 printf(" %s", symname);
1356 }
1357
1358 if (print_dso) {
1359 if (al.map && al.map->dso && al.map->dso->name)
1360 dsoname = al.map->dso->name;
1361 else
1362 dsoname = "";
1363
1364 printf(" (%s)", dsoname);
1365 }
1366 }
1367 }
1368
1369 int perf_session__cpu_bitmap(struct perf_session *session,
1370 const char *cpu_list, unsigned long *cpu_bitmap)
1371 {
1372 int i;
1373 struct cpu_map *map;
1374
1375 for (i = 0; i < PERF_TYPE_MAX; ++i) {
1376 struct perf_evsel *evsel;
1377
1378 evsel = perf_session__find_first_evtype(session, i);
1379 if (!evsel)
1380 continue;
1381
1382 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1383 pr_err("File does not contain CPU events. "
1384 "Remove -c option to proceed.\n");
1385 return -1;
1386 }
1387 }
1388
1389 map = cpu_map__new(cpu_list);
1390 if (map == NULL) {
1391 pr_err("Invalid cpu_list\n");
1392 return -1;
1393 }
1394
1395 for (i = 0; i < map->nr; i++) {
1396 int cpu = map->map[i];
1397
1398 if (cpu >= MAX_NR_CPUS) {
1399 pr_err("Requested CPU %d too large. "
1400 "Consider raising MAX_NR_CPUS\n", cpu);
1401 return -1;
1402 }
1403
1404 set_bit(cpu, cpu_bitmap);
1405 }
1406
1407 return 0;
1408 }
1409
1410 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1411 bool full)
1412 {
1413 struct stat st;
1414 int ret;
1415
1416 if (session == NULL || fp == NULL)
1417 return;
1418
1419 ret = fstat(session->fd, &st);
1420 if (ret == -1)
1421 return;
1422
1423 fprintf(fp, "# ========\n");
1424 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1425 perf_header__fprintf_info(session, fp, full);
1426 fprintf(fp, "# ========\n#\n");
1427 }