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perf unwind: Fix wrongly used regs for aarch64 unwind
[deliverable/linux.git] / tools / perf / util / intel-bts.c
1 /*
2 * intel-bts.c: Intel Processor Trace support
3 * Copyright (c) 2013-2015, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 */
15
16 #include <endian.h>
17 #include <byteswap.h>
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/bitops.h>
21 #include <linux/log2.h>
22
23 #include "cpumap.h"
24 #include "color.h"
25 #include "evsel.h"
26 #include "evlist.h"
27 #include "machine.h"
28 #include "session.h"
29 #include "util.h"
30 #include "thread.h"
31 #include "thread-stack.h"
32 #include "debug.h"
33 #include "tsc.h"
34 #include "auxtrace.h"
35 #include "intel-pt-decoder/intel-pt-insn-decoder.h"
36 #include "intel-bts.h"
37
38 #define MAX_TIMESTAMP (~0ULL)
39
40 #define INTEL_BTS_ERR_NOINSN 5
41 #define INTEL_BTS_ERR_LOST 9
42
43 #if __BYTE_ORDER == __BIG_ENDIAN
44 #define le64_to_cpu bswap_64
45 #else
46 #define le64_to_cpu
47 #endif
48
49 struct intel_bts {
50 struct auxtrace auxtrace;
51 struct auxtrace_queues queues;
52 struct auxtrace_heap heap;
53 u32 auxtrace_type;
54 struct perf_session *session;
55 struct machine *machine;
56 bool sampling_mode;
57 bool snapshot_mode;
58 bool data_queued;
59 u32 pmu_type;
60 struct perf_tsc_conversion tc;
61 bool cap_user_time_zero;
62 struct itrace_synth_opts synth_opts;
63 bool sample_branches;
64 u32 branches_filter;
65 u64 branches_sample_type;
66 u64 branches_id;
67 size_t branches_event_size;
68 bool synth_needs_swap;
69 unsigned long num_events;
70 };
71
72 struct intel_bts_queue {
73 struct intel_bts *bts;
74 unsigned int queue_nr;
75 struct auxtrace_buffer *buffer;
76 bool on_heap;
77 bool done;
78 pid_t pid;
79 pid_t tid;
80 int cpu;
81 u64 time;
82 struct intel_pt_insn intel_pt_insn;
83 u32 sample_flags;
84 };
85
86 struct branch {
87 u64 from;
88 u64 to;
89 u64 misc;
90 };
91
92 static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
93 unsigned char *buf, size_t len)
94 {
95 struct branch *branch;
96 size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
97 const char *color = PERF_COLOR_BLUE;
98
99 color_fprintf(stdout, color,
100 ". ... Intel BTS data: size %zu bytes\n",
101 len);
102
103 while (len) {
104 if (len >= br_sz)
105 sz = br_sz;
106 else
107 sz = len;
108 printf(".");
109 color_fprintf(stdout, color, " %08x: ", pos);
110 for (i = 0; i < sz; i++)
111 color_fprintf(stdout, color, " %02x", buf[i]);
112 for (; i < br_sz; i++)
113 color_fprintf(stdout, color, " ");
114 if (len >= br_sz) {
115 branch = (struct branch *)buf;
116 color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
117 le64_to_cpu(branch->from),
118 le64_to_cpu(branch->to),
119 le64_to_cpu(branch->misc) & 0x10 ?
120 "pred" : "miss");
121 } else {
122 color_fprintf(stdout, color, " Bad record!\n");
123 }
124 pos += sz;
125 buf += sz;
126 len -= sz;
127 }
128 }
129
130 static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
131 size_t len)
132 {
133 printf(".\n");
134 intel_bts_dump(bts, buf, len);
135 }
136
137 static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
138 {
139 union perf_event event;
140 int err;
141
142 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
143 INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
144 sample->tid, 0, "Lost trace data");
145
146 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
147 if (err)
148 pr_err("Intel BTS: failed to deliver error event, error %d\n",
149 err);
150
151 return err;
152 }
153
154 static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
155 unsigned int queue_nr)
156 {
157 struct intel_bts_queue *btsq;
158
159 btsq = zalloc(sizeof(struct intel_bts_queue));
160 if (!btsq)
161 return NULL;
162
163 btsq->bts = bts;
164 btsq->queue_nr = queue_nr;
165 btsq->pid = -1;
166 btsq->tid = -1;
167 btsq->cpu = -1;
168
169 return btsq;
170 }
171
172 static int intel_bts_setup_queue(struct intel_bts *bts,
173 struct auxtrace_queue *queue,
174 unsigned int queue_nr)
175 {
176 struct intel_bts_queue *btsq = queue->priv;
177
178 if (list_empty(&queue->head))
179 return 0;
180
181 if (!btsq) {
182 btsq = intel_bts_alloc_queue(bts, queue_nr);
183 if (!btsq)
184 return -ENOMEM;
185 queue->priv = btsq;
186
187 if (queue->cpu != -1)
188 btsq->cpu = queue->cpu;
189 btsq->tid = queue->tid;
190 }
191
192 if (bts->sampling_mode)
193 return 0;
194
195 if (!btsq->on_heap && !btsq->buffer) {
196 int ret;
197
198 btsq->buffer = auxtrace_buffer__next(queue, NULL);
199 if (!btsq->buffer)
200 return 0;
201
202 ret = auxtrace_heap__add(&bts->heap, queue_nr,
203 btsq->buffer->reference);
204 if (ret)
205 return ret;
206 btsq->on_heap = true;
207 }
208
209 return 0;
210 }
211
212 static int intel_bts_setup_queues(struct intel_bts *bts)
213 {
214 unsigned int i;
215 int ret;
216
217 for (i = 0; i < bts->queues.nr_queues; i++) {
218 ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
219 i);
220 if (ret)
221 return ret;
222 }
223 return 0;
224 }
225
226 static inline int intel_bts_update_queues(struct intel_bts *bts)
227 {
228 if (bts->queues.new_data) {
229 bts->queues.new_data = false;
230 return intel_bts_setup_queues(bts);
231 }
232 return 0;
233 }
234
235 static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
236 unsigned char *buf_b, size_t len_b)
237 {
238 size_t offs, len;
239
240 if (len_a > len_b)
241 offs = len_a - len_b;
242 else
243 offs = 0;
244
245 for (; offs < len_a; offs += sizeof(struct branch)) {
246 len = len_a - offs;
247 if (!memcmp(buf_a + offs, buf_b, len))
248 return buf_b + len;
249 }
250
251 return buf_b;
252 }
253
254 static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
255 struct auxtrace_buffer *b)
256 {
257 struct auxtrace_buffer *a;
258 void *start;
259
260 if (b->list.prev == &queue->head)
261 return 0;
262 a = list_entry(b->list.prev, struct auxtrace_buffer, list);
263 start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
264 if (!start)
265 return -EINVAL;
266 b->use_size = b->data + b->size - start;
267 b->use_data = start;
268 return 0;
269 }
270
271 static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
272 struct branch *branch)
273 {
274 int ret;
275 struct intel_bts *bts = btsq->bts;
276 union perf_event event;
277 struct perf_sample sample = { .ip = 0, };
278
279 if (bts->synth_opts.initial_skip &&
280 bts->num_events++ <= bts->synth_opts.initial_skip)
281 return 0;
282
283 event.sample.header.type = PERF_RECORD_SAMPLE;
284 event.sample.header.misc = PERF_RECORD_MISC_USER;
285 event.sample.header.size = sizeof(struct perf_event_header);
286
287 sample.cpumode = PERF_RECORD_MISC_USER;
288 sample.ip = le64_to_cpu(branch->from);
289 sample.pid = btsq->pid;
290 sample.tid = btsq->tid;
291 sample.addr = le64_to_cpu(branch->to);
292 sample.id = btsq->bts->branches_id;
293 sample.stream_id = btsq->bts->branches_id;
294 sample.period = 1;
295 sample.cpu = btsq->cpu;
296 sample.flags = btsq->sample_flags;
297 sample.insn_len = btsq->intel_pt_insn.length;
298
299 if (bts->synth_opts.inject) {
300 event.sample.header.size = bts->branches_event_size;
301 ret = perf_event__synthesize_sample(&event,
302 bts->branches_sample_type,
303 0, &sample,
304 bts->synth_needs_swap);
305 if (ret)
306 return ret;
307 }
308
309 ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
310 if (ret)
311 pr_err("Intel BTS: failed to deliver branch event, error %d\n",
312 ret);
313
314 return ret;
315 }
316
317 static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
318 {
319 struct machine *machine = btsq->bts->machine;
320 struct thread *thread;
321 struct addr_location al;
322 unsigned char buf[1024];
323 size_t bufsz;
324 ssize_t len;
325 int x86_64;
326 uint8_t cpumode;
327 int err = -1;
328
329 bufsz = intel_pt_insn_max_size();
330
331 if (machine__kernel_ip(machine, ip))
332 cpumode = PERF_RECORD_MISC_KERNEL;
333 else
334 cpumode = PERF_RECORD_MISC_USER;
335
336 thread = machine__find_thread(machine, -1, btsq->tid);
337 if (!thread)
338 return -1;
339
340 thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
341 if (!al.map || !al.map->dso)
342 goto out_put;
343
344 len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz);
345 if (len <= 0)
346 goto out_put;
347
348 /* Load maps to ensure dso->is_64_bit has been updated */
349 map__load(al.map, machine->symbol_filter);
350
351 x86_64 = al.map->dso->is_64_bit;
352
353 if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
354 goto out_put;
355
356 err = 0;
357 out_put:
358 thread__put(thread);
359 return err;
360 }
361
362 static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
363 pid_t tid, u64 ip)
364 {
365 union perf_event event;
366 int err;
367
368 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
369 INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
370 "Failed to get instruction");
371
372 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
373 if (err)
374 pr_err("Intel BTS: failed to deliver error event, error %d\n",
375 err);
376
377 return err;
378 }
379
380 static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
381 struct branch *branch)
382 {
383 int err;
384
385 if (!branch->from) {
386 if (branch->to)
387 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
388 PERF_IP_FLAG_TRACE_BEGIN;
389 else
390 btsq->sample_flags = 0;
391 btsq->intel_pt_insn.length = 0;
392 } else if (!branch->to) {
393 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
394 PERF_IP_FLAG_TRACE_END;
395 btsq->intel_pt_insn.length = 0;
396 } else {
397 err = intel_bts_get_next_insn(btsq, branch->from);
398 if (err) {
399 btsq->sample_flags = 0;
400 btsq->intel_pt_insn.length = 0;
401 if (!btsq->bts->synth_opts.errors)
402 return 0;
403 err = intel_bts_synth_error(btsq->bts, btsq->cpu,
404 btsq->pid, btsq->tid,
405 branch->from);
406 return err;
407 }
408 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
409 /* Check for an async branch into the kernel */
410 if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
411 machine__kernel_ip(btsq->bts->machine, branch->to) &&
412 btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
413 PERF_IP_FLAG_CALL |
414 PERF_IP_FLAG_SYSCALLRET))
415 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
416 PERF_IP_FLAG_CALL |
417 PERF_IP_FLAG_ASYNC |
418 PERF_IP_FLAG_INTERRUPT;
419 }
420
421 return 0;
422 }
423
424 static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
425 struct auxtrace_buffer *buffer)
426 {
427 struct branch *branch;
428 size_t sz, bsz = sizeof(struct branch);
429 u32 filter = btsq->bts->branches_filter;
430 int err = 0;
431
432 if (buffer->use_data) {
433 sz = buffer->use_size;
434 branch = buffer->use_data;
435 } else {
436 sz = buffer->size;
437 branch = buffer->data;
438 }
439
440 if (!btsq->bts->sample_branches)
441 return 0;
442
443 for (; sz > bsz; branch += 1, sz -= bsz) {
444 if (!branch->from && !branch->to)
445 continue;
446 intel_bts_get_branch_type(btsq, branch);
447 if (filter && !(filter & btsq->sample_flags))
448 continue;
449 err = intel_bts_synth_branch_sample(btsq, branch);
450 if (err)
451 break;
452 }
453 return err;
454 }
455
456 static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
457 {
458 struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
459 struct auxtrace_queue *queue;
460 struct thread *thread;
461 int err;
462
463 if (btsq->done)
464 return 1;
465
466 if (btsq->pid == -1) {
467 thread = machine__find_thread(btsq->bts->machine, -1,
468 btsq->tid);
469 if (thread)
470 btsq->pid = thread->pid_;
471 } else {
472 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
473 btsq->tid);
474 }
475
476 queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
477
478 if (!buffer)
479 buffer = auxtrace_buffer__next(queue, NULL);
480
481 if (!buffer) {
482 if (!btsq->bts->sampling_mode)
483 btsq->done = 1;
484 err = 1;
485 goto out_put;
486 }
487
488 /* Currently there is no support for split buffers */
489 if (buffer->consecutive) {
490 err = -EINVAL;
491 goto out_put;
492 }
493
494 if (!buffer->data) {
495 int fd = perf_data_file__fd(btsq->bts->session->file);
496
497 buffer->data = auxtrace_buffer__get_data(buffer, fd);
498 if (!buffer->data) {
499 err = -ENOMEM;
500 goto out_put;
501 }
502 }
503
504 if (btsq->bts->snapshot_mode && !buffer->consecutive &&
505 intel_bts_do_fix_overlap(queue, buffer)) {
506 err = -ENOMEM;
507 goto out_put;
508 }
509
510 if (!btsq->bts->synth_opts.callchain && thread &&
511 (!old_buffer || btsq->bts->sampling_mode ||
512 (btsq->bts->snapshot_mode && !buffer->consecutive)))
513 thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1);
514
515 err = intel_bts_process_buffer(btsq, buffer);
516
517 auxtrace_buffer__drop_data(buffer);
518
519 btsq->buffer = auxtrace_buffer__next(queue, buffer);
520 if (btsq->buffer) {
521 if (timestamp)
522 *timestamp = btsq->buffer->reference;
523 } else {
524 if (!btsq->bts->sampling_mode)
525 btsq->done = 1;
526 }
527 out_put:
528 thread__put(thread);
529 return err;
530 }
531
532 static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
533 {
534 u64 ts = 0;
535 int ret;
536
537 while (1) {
538 ret = intel_bts_process_queue(btsq, &ts);
539 if (ret < 0)
540 return ret;
541 if (ret)
542 break;
543 }
544 return 0;
545 }
546
547 static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
548 {
549 struct auxtrace_queues *queues = &bts->queues;
550 unsigned int i;
551
552 for (i = 0; i < queues->nr_queues; i++) {
553 struct auxtrace_queue *queue = &bts->queues.queue_array[i];
554 struct intel_bts_queue *btsq = queue->priv;
555
556 if (btsq && btsq->tid == tid)
557 return intel_bts_flush_queue(btsq);
558 }
559 return 0;
560 }
561
562 static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
563 {
564 while (1) {
565 unsigned int queue_nr;
566 struct auxtrace_queue *queue;
567 struct intel_bts_queue *btsq;
568 u64 ts = 0;
569 int ret;
570
571 if (!bts->heap.heap_cnt)
572 return 0;
573
574 if (bts->heap.heap_array[0].ordinal > timestamp)
575 return 0;
576
577 queue_nr = bts->heap.heap_array[0].queue_nr;
578 queue = &bts->queues.queue_array[queue_nr];
579 btsq = queue->priv;
580
581 auxtrace_heap__pop(&bts->heap);
582
583 ret = intel_bts_process_queue(btsq, &ts);
584 if (ret < 0) {
585 auxtrace_heap__add(&bts->heap, queue_nr, ts);
586 return ret;
587 }
588
589 if (!ret) {
590 ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
591 if (ret < 0)
592 return ret;
593 } else {
594 btsq->on_heap = false;
595 }
596 }
597
598 return 0;
599 }
600
601 static int intel_bts_process_event(struct perf_session *session,
602 union perf_event *event,
603 struct perf_sample *sample,
604 struct perf_tool *tool)
605 {
606 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
607 auxtrace);
608 u64 timestamp;
609 int err;
610
611 if (dump_trace)
612 return 0;
613
614 if (!tool->ordered_events) {
615 pr_err("Intel BTS requires ordered events\n");
616 return -EINVAL;
617 }
618
619 if (sample->time && sample->time != (u64)-1)
620 timestamp = perf_time_to_tsc(sample->time, &bts->tc);
621 else
622 timestamp = 0;
623
624 err = intel_bts_update_queues(bts);
625 if (err)
626 return err;
627
628 err = intel_bts_process_queues(bts, timestamp);
629 if (err)
630 return err;
631 if (event->header.type == PERF_RECORD_EXIT) {
632 err = intel_bts_process_tid_exit(bts, event->fork.tid);
633 if (err)
634 return err;
635 }
636
637 if (event->header.type == PERF_RECORD_AUX &&
638 (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
639 bts->synth_opts.errors)
640 err = intel_bts_lost(bts, sample);
641
642 return err;
643 }
644
645 static int intel_bts_process_auxtrace_event(struct perf_session *session,
646 union perf_event *event,
647 struct perf_tool *tool __maybe_unused)
648 {
649 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
650 auxtrace);
651
652 if (bts->sampling_mode)
653 return 0;
654
655 if (!bts->data_queued) {
656 struct auxtrace_buffer *buffer;
657 off_t data_offset;
658 int fd = perf_data_file__fd(session->file);
659 int err;
660
661 if (perf_data_file__is_pipe(session->file)) {
662 data_offset = 0;
663 } else {
664 data_offset = lseek(fd, 0, SEEK_CUR);
665 if (data_offset == -1)
666 return -errno;
667 }
668
669 err = auxtrace_queues__add_event(&bts->queues, session, event,
670 data_offset, &buffer);
671 if (err)
672 return err;
673
674 /* Dump here now we have copied a piped trace out of the pipe */
675 if (dump_trace) {
676 if (auxtrace_buffer__get_data(buffer, fd)) {
677 intel_bts_dump_event(bts, buffer->data,
678 buffer->size);
679 auxtrace_buffer__put_data(buffer);
680 }
681 }
682 }
683
684 return 0;
685 }
686
687 static int intel_bts_flush(struct perf_session *session,
688 struct perf_tool *tool __maybe_unused)
689 {
690 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
691 auxtrace);
692 int ret;
693
694 if (dump_trace || bts->sampling_mode)
695 return 0;
696
697 if (!tool->ordered_events)
698 return -EINVAL;
699
700 ret = intel_bts_update_queues(bts);
701 if (ret < 0)
702 return ret;
703
704 return intel_bts_process_queues(bts, MAX_TIMESTAMP);
705 }
706
707 static void intel_bts_free_queue(void *priv)
708 {
709 struct intel_bts_queue *btsq = priv;
710
711 if (!btsq)
712 return;
713 free(btsq);
714 }
715
716 static void intel_bts_free_events(struct perf_session *session)
717 {
718 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
719 auxtrace);
720 struct auxtrace_queues *queues = &bts->queues;
721 unsigned int i;
722
723 for (i = 0; i < queues->nr_queues; i++) {
724 intel_bts_free_queue(queues->queue_array[i].priv);
725 queues->queue_array[i].priv = NULL;
726 }
727 auxtrace_queues__free(queues);
728 }
729
730 static void intel_bts_free(struct perf_session *session)
731 {
732 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
733 auxtrace);
734
735 auxtrace_heap__free(&bts->heap);
736 intel_bts_free_events(session);
737 session->auxtrace = NULL;
738 free(bts);
739 }
740
741 struct intel_bts_synth {
742 struct perf_tool dummy_tool;
743 struct perf_session *session;
744 };
745
746 static int intel_bts_event_synth(struct perf_tool *tool,
747 union perf_event *event,
748 struct perf_sample *sample __maybe_unused,
749 struct machine *machine __maybe_unused)
750 {
751 struct intel_bts_synth *intel_bts_synth =
752 container_of(tool, struct intel_bts_synth, dummy_tool);
753
754 return perf_session__deliver_synth_event(intel_bts_synth->session,
755 event, NULL);
756 }
757
758 static int intel_bts_synth_event(struct perf_session *session,
759 struct perf_event_attr *attr, u64 id)
760 {
761 struct intel_bts_synth intel_bts_synth;
762
763 memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
764 intel_bts_synth.session = session;
765
766 return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
767 &id, intel_bts_event_synth);
768 }
769
770 static int intel_bts_synth_events(struct intel_bts *bts,
771 struct perf_session *session)
772 {
773 struct perf_evlist *evlist = session->evlist;
774 struct perf_evsel *evsel;
775 struct perf_event_attr attr;
776 bool found = false;
777 u64 id;
778 int err;
779
780 evlist__for_each(evlist, evsel) {
781 if (evsel->attr.type == bts->pmu_type && evsel->ids) {
782 found = true;
783 break;
784 }
785 }
786
787 if (!found) {
788 pr_debug("There are no selected events with Intel BTS data\n");
789 return 0;
790 }
791
792 memset(&attr, 0, sizeof(struct perf_event_attr));
793 attr.size = sizeof(struct perf_event_attr);
794 attr.type = PERF_TYPE_HARDWARE;
795 attr.sample_type = evsel->attr.sample_type & PERF_SAMPLE_MASK;
796 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
797 PERF_SAMPLE_PERIOD;
798 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
799 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
800 attr.exclude_user = evsel->attr.exclude_user;
801 attr.exclude_kernel = evsel->attr.exclude_kernel;
802 attr.exclude_hv = evsel->attr.exclude_hv;
803 attr.exclude_host = evsel->attr.exclude_host;
804 attr.exclude_guest = evsel->attr.exclude_guest;
805 attr.sample_id_all = evsel->attr.sample_id_all;
806 attr.read_format = evsel->attr.read_format;
807
808 id = evsel->id[0] + 1000000000;
809 if (!id)
810 id = 1;
811
812 if (bts->synth_opts.branches) {
813 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
814 attr.sample_period = 1;
815 attr.sample_type |= PERF_SAMPLE_ADDR;
816 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
817 id, (u64)attr.sample_type);
818 err = intel_bts_synth_event(session, &attr, id);
819 if (err) {
820 pr_err("%s: failed to synthesize 'branches' event type\n",
821 __func__);
822 return err;
823 }
824 bts->sample_branches = true;
825 bts->branches_sample_type = attr.sample_type;
826 bts->branches_id = id;
827 /*
828 * We only use sample types from PERF_SAMPLE_MASK so we can use
829 * __perf_evsel__sample_size() here.
830 */
831 bts->branches_event_size = sizeof(struct sample_event) +
832 __perf_evsel__sample_size(attr.sample_type);
833 }
834
835 bts->synth_needs_swap = evsel->needs_swap;
836
837 return 0;
838 }
839
840 static const char * const intel_bts_info_fmts[] = {
841 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
842 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
843 [INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n",
844 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
845 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
846 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
847 };
848
849 static void intel_bts_print_info(u64 *arr, int start, int finish)
850 {
851 int i;
852
853 if (!dump_trace)
854 return;
855
856 for (i = start; i <= finish; i++)
857 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
858 }
859
860 u64 intel_bts_auxtrace_info_priv[INTEL_BTS_AUXTRACE_PRIV_SIZE];
861
862 int intel_bts_process_auxtrace_info(union perf_event *event,
863 struct perf_session *session)
864 {
865 struct auxtrace_info_event *auxtrace_info = &event->auxtrace_info;
866 size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
867 struct intel_bts *bts;
868 int err;
869
870 if (auxtrace_info->header.size < sizeof(struct auxtrace_info_event) +
871 min_sz)
872 return -EINVAL;
873
874 bts = zalloc(sizeof(struct intel_bts));
875 if (!bts)
876 return -ENOMEM;
877
878 err = auxtrace_queues__init(&bts->queues);
879 if (err)
880 goto err_free;
881
882 bts->session = session;
883 bts->machine = &session->machines.host; /* No kvm support */
884 bts->auxtrace_type = auxtrace_info->type;
885 bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
886 bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
887 bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
888 bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
889 bts->cap_user_time_zero =
890 auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
891 bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
892
893 bts->sampling_mode = false;
894
895 bts->auxtrace.process_event = intel_bts_process_event;
896 bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
897 bts->auxtrace.flush_events = intel_bts_flush;
898 bts->auxtrace.free_events = intel_bts_free_events;
899 bts->auxtrace.free = intel_bts_free;
900 session->auxtrace = &bts->auxtrace;
901
902 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
903 INTEL_BTS_SNAPSHOT_MODE);
904
905 if (dump_trace)
906 return 0;
907
908 if (session->itrace_synth_opts && session->itrace_synth_opts->set)
909 bts->synth_opts = *session->itrace_synth_opts;
910 else
911 itrace_synth_opts__set_default(&bts->synth_opts);
912
913 if (bts->synth_opts.calls)
914 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
915 PERF_IP_FLAG_TRACE_END;
916 if (bts->synth_opts.returns)
917 bts->branches_filter |= PERF_IP_FLAG_RETURN |
918 PERF_IP_FLAG_TRACE_BEGIN;
919
920 err = intel_bts_synth_events(bts, session);
921 if (err)
922 goto err_free_queues;
923
924 err = auxtrace_queues__process_index(&bts->queues, session);
925 if (err)
926 goto err_free_queues;
927
928 if (bts->queues.populated)
929 bts->data_queued = true;
930
931 return 0;
932
933 err_free_queues:
934 auxtrace_queues__free(&bts->queues);
935 session->auxtrace = NULL;
936 err_free:
937 free(bts);
938 return err;
939 }
Linux kernel - Deliverables
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