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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * intel-bts.c: Intel Processor Trace support
4 * Copyright (c) 2013-2015, Intel Corporation.
5 */
6
7#include <endian.h>
8#include <errno.h>
9#include <byteswap.h>
10#include <inttypes.h>
11#include <linux/kernel.h>
12#include <linux/types.h>
13#include <linux/bitops.h>
14#include <linux/log2.h>
15#include <linux/zalloc.h>
16
17#include "color.h"
18#include "evsel.h"
19#include "evlist.h"
20#include "machine.h"
21#include "symbol.h"
22#include "session.h"
23#include "tool.h"
24#include "thread.h"
25#include "thread-stack.h"
26#include "debug.h"
27#include "tsc.h"
28#include "auxtrace.h"
29#include "intel-pt-decoder/intel-pt-insn-decoder.h"
30#include "intel-bts.h"
31#include "util/synthetic-events.h"
32
33#define MAX_TIMESTAMP (~0ULL)
34
35#define INTEL_BTS_ERR_NOINSN 5
36#define INTEL_BTS_ERR_LOST 9
37
38#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
39#define le64_to_cpu bswap_64
40#else
41#define le64_to_cpu
42#endif
43
44struct intel_bts {
45 struct auxtrace auxtrace;
46 struct auxtrace_queues queues;
47 struct auxtrace_heap heap;
48 u32 auxtrace_type;
49 struct perf_session *session;
50 struct machine *machine;
51 bool sampling_mode;
52 bool snapshot_mode;
53 bool data_queued;
54 u32 pmu_type;
55 struct perf_tsc_conversion tc;
56 bool cap_user_time_zero;
57 struct itrace_synth_opts synth_opts;
58 bool sample_branches;
59 u32 branches_filter;
60 u64 branches_sample_type;
61 u64 branches_id;
62 size_t branches_event_size;
63 unsigned long num_events;
64};
65
66struct intel_bts_queue {
67 struct intel_bts *bts;
68 unsigned int queue_nr;
69 struct auxtrace_buffer *buffer;
70 bool on_heap;
71 bool done;
72 pid_t pid;
73 pid_t tid;
74 int cpu;
75 u64 time;
76 struct intel_pt_insn intel_pt_insn;
77 u32 sample_flags;
78};
79
80struct branch {
81 u64 from;
82 u64 to;
83 u64 misc;
84};
85
86static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
87 unsigned char *buf, size_t len)
88{
89 struct branch *branch;
90 size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
91 const char *color = PERF_COLOR_BLUE;
92
93 color_fprintf(stdout, color,
94 ". ... Intel BTS data: size %zu bytes\n",
95 len);
96
97 while (len) {
98 if (len >= br_sz)
99 sz = br_sz;
100 else
101 sz = len;
102 printf(".");
103 color_fprintf(stdout, color, " %08zx: ", pos);
104 for (i = 0; i < sz; i++)
105 color_fprintf(stdout, color, " %02x", buf[i]);
106 for (; i < br_sz; i++)
107 color_fprintf(stdout, color, " ");
108 if (len >= br_sz) {
109 branch = (struct branch *)buf;
110 color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
111 le64_to_cpu(branch->from),
112 le64_to_cpu(branch->to),
113 le64_to_cpu(branch->misc) & 0x10 ?
114 "pred" : "miss");
115 } else {
116 color_fprintf(stdout, color, " Bad record!\n");
117 }
118 pos += sz;
119 buf += sz;
120 len -= sz;
121 }
122}
123
124static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
125 size_t len)
126{
127 printf(".\n");
128 intel_bts_dump(bts, buf, len);
129}
130
131static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
132{
133 union perf_event event;
134 int err;
135
136 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
137 INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
138 sample->tid, 0, "Lost trace data", sample->time);
139
140 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
141 if (err)
142 pr_err("Intel BTS: failed to deliver error event, error %d\n",
143 err);
144
145 return err;
146}
147
148static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
149 unsigned int queue_nr)
150{
151 struct intel_bts_queue *btsq;
152
153 btsq = zalloc(sizeof(struct intel_bts_queue));
154 if (!btsq)
155 return NULL;
156
157 btsq->bts = bts;
158 btsq->queue_nr = queue_nr;
159 btsq->pid = -1;
160 btsq->tid = -1;
161 btsq->cpu = -1;
162
163 return btsq;
164}
165
166static int intel_bts_setup_queue(struct intel_bts *bts,
167 struct auxtrace_queue *queue,
168 unsigned int queue_nr)
169{
170 struct intel_bts_queue *btsq = queue->priv;
171
172 if (list_empty(&queue->head))
173 return 0;
174
175 if (!btsq) {
176 btsq = intel_bts_alloc_queue(bts, queue_nr);
177 if (!btsq)
178 return -ENOMEM;
179 queue->priv = btsq;
180
181 if (queue->cpu != -1)
182 btsq->cpu = queue->cpu;
183 btsq->tid = queue->tid;
184 }
185
186 if (bts->sampling_mode)
187 return 0;
188
189 if (!btsq->on_heap && !btsq->buffer) {
190 int ret;
191
192 btsq->buffer = auxtrace_buffer__next(queue, NULL);
193 if (!btsq->buffer)
194 return 0;
195
196 ret = auxtrace_heap__add(&bts->heap, queue_nr,
197 btsq->buffer->reference);
198 if (ret)
199 return ret;
200 btsq->on_heap = true;
201 }
202
203 return 0;
204}
205
206static int intel_bts_setup_queues(struct intel_bts *bts)
207{
208 unsigned int i;
209 int ret;
210
211 for (i = 0; i < bts->queues.nr_queues; i++) {
212 ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
213 i);
214 if (ret)
215 return ret;
216 }
217 return 0;
218}
219
220static inline int intel_bts_update_queues(struct intel_bts *bts)
221{
222 if (bts->queues.new_data) {
223 bts->queues.new_data = false;
224 return intel_bts_setup_queues(bts);
225 }
226 return 0;
227}
228
229static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
230 unsigned char *buf_b, size_t len_b)
231{
232 size_t offs, len;
233
234 if (len_a > len_b)
235 offs = len_a - len_b;
236 else
237 offs = 0;
238
239 for (; offs < len_a; offs += sizeof(struct branch)) {
240 len = len_a - offs;
241 if (!memcmp(buf_a + offs, buf_b, len))
242 return buf_b + len;
243 }
244
245 return buf_b;
246}
247
248static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
249 struct auxtrace_buffer *b)
250{
251 struct auxtrace_buffer *a;
252 void *start;
253
254 if (b->list.prev == &queue->head)
255 return 0;
256 a = list_entry(b->list.prev, struct auxtrace_buffer, list);
257 start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
258 if (!start)
259 return -EINVAL;
260 b->use_size = b->data + b->size - start;
261 b->use_data = start;
262 return 0;
263}
264
265static inline u8 intel_bts_cpumode(struct intel_bts *bts, uint64_t ip)
266{
267 return machine__kernel_ip(bts->machine, ip) ?
268 PERF_RECORD_MISC_KERNEL :
269 PERF_RECORD_MISC_USER;
270}
271
272static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
273 struct branch *branch)
274{
275 int ret;
276 struct intel_bts *bts = btsq->bts;
277 union perf_event event;
278 struct perf_sample sample;
279
280 if (bts->synth_opts.initial_skip &&
281 bts->num_events++ <= bts->synth_opts.initial_skip)
282 return 0;
283
284 perf_sample__init(&sample, /*all=*/true);
285 sample.ip = le64_to_cpu(branch->from);
286 sample.cpumode = intel_bts_cpumode(bts, sample.ip);
287 sample.pid = btsq->pid;
288 sample.tid = btsq->tid;
289 sample.addr = le64_to_cpu(branch->to);
290 sample.id = btsq->bts->branches_id;
291 sample.stream_id = btsq->bts->branches_id;
292 sample.period = 1;
293 sample.cpu = btsq->cpu;
294 sample.flags = btsq->sample_flags;
295 sample.insn_len = btsq->intel_pt_insn.length;
296 memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
297
298 event.sample.header.type = PERF_RECORD_SAMPLE;
299 event.sample.header.misc = sample.cpumode;
300 event.sample.header.size = sizeof(struct perf_event_header);
301
302 if (bts->synth_opts.inject) {
303 event.sample.header.size = bts->branches_event_size;
304 ret = perf_event__synthesize_sample(&event,
305 bts->branches_sample_type,
306 /*read_format=*/0, /*branch_sample_type=*/0,
307 &sample);
308 if (ret)
309 return ret;
310 }
311
312 ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
313 if (ret)
314 pr_err("Intel BTS: failed to deliver branch event, error %d\n",
315 ret);
316
317 perf_sample__exit(&sample);
318 return ret;
319}
320
321static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
322{
323 struct machine *machine = btsq->bts->machine;
324 struct thread *thread;
325 unsigned char buf[INTEL_PT_INSN_BUF_SZ];
326 ssize_t len;
327 bool x86_64;
328 int err = -1;
329
330 thread = machine__find_thread(machine, -1, btsq->tid);
331 if (!thread)
332 return -1;
333
334 len = thread__memcpy(thread, machine, buf, ip, INTEL_PT_INSN_BUF_SZ, &x86_64);
335 if (len <= 0)
336 goto out_put;
337
338 if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
339 goto out_put;
340
341 err = 0;
342out_put:
343 thread__put(thread);
344 return err;
345}
346
347static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
348 pid_t tid, u64 ip)
349{
350 union perf_event event;
351 int err;
352
353 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
354 INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
355 "Failed to get instruction", 0);
356
357 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
358 if (err)
359 pr_err("Intel BTS: failed to deliver error event, error %d\n",
360 err);
361
362 return err;
363}
364
365static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
366 struct branch *branch)
367{
368 int err;
369
370 if (!branch->from) {
371 if (branch->to)
372 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
373 PERF_IP_FLAG_TRACE_BEGIN;
374 else
375 btsq->sample_flags = 0;
376 btsq->intel_pt_insn.length = 0;
377 } else if (!branch->to) {
378 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
379 PERF_IP_FLAG_TRACE_END;
380 btsq->intel_pt_insn.length = 0;
381 } else {
382 err = intel_bts_get_next_insn(btsq, branch->from);
383 if (err) {
384 btsq->sample_flags = 0;
385 btsq->intel_pt_insn.length = 0;
386 if (!btsq->bts->synth_opts.errors)
387 return 0;
388 err = intel_bts_synth_error(btsq->bts, btsq->cpu,
389 btsq->pid, btsq->tid,
390 branch->from);
391 return err;
392 }
393 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
394 /* Check for an async branch into the kernel */
395 if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
396 machine__kernel_ip(btsq->bts->machine, branch->to) &&
397 btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
398 PERF_IP_FLAG_CALL |
399 PERF_IP_FLAG_SYSCALLRET))
400 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
401 PERF_IP_FLAG_CALL |
402 PERF_IP_FLAG_ASYNC |
403 PERF_IP_FLAG_INTERRUPT;
404 }
405
406 return 0;
407}
408
409static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
410 struct auxtrace_buffer *buffer,
411 struct thread *thread)
412{
413 struct branch *branch;
414 size_t sz, bsz = sizeof(struct branch);
415 u32 filter = btsq->bts->branches_filter;
416 int err = 0;
417
418 if (buffer->use_data) {
419 sz = buffer->use_size;
420 branch = buffer->use_data;
421 } else {
422 sz = buffer->size;
423 branch = buffer->data;
424 }
425
426 if (!btsq->bts->sample_branches)
427 return 0;
428
429 for (; sz > bsz; branch += 1, sz -= bsz) {
430 if (!branch->from && !branch->to)
431 continue;
432 intel_bts_get_branch_type(btsq, branch);
433 if (btsq->bts->synth_opts.thread_stack)
434 thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
435 le64_to_cpu(branch->from),
436 le64_to_cpu(branch->to),
437 btsq->intel_pt_insn.length,
438 buffer->buffer_nr + 1, true, 0, 0);
439 if (filter && !(filter & btsq->sample_flags))
440 continue;
441 err = intel_bts_synth_branch_sample(btsq, branch);
442 if (err)
443 break;
444 }
445 return err;
446}
447
448static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
449{
450 struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
451 struct auxtrace_queue *queue;
452 struct thread *thread;
453 int err;
454
455 if (btsq->done)
456 return 1;
457
458 if (btsq->pid == -1) {
459 thread = machine__find_thread(btsq->bts->machine, -1,
460 btsq->tid);
461 if (thread)
462 btsq->pid = thread__pid(thread);
463 } else {
464 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
465 btsq->tid);
466 }
467
468 queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
469
470 if (!buffer)
471 buffer = auxtrace_buffer__next(queue, NULL);
472
473 if (!buffer) {
474 if (!btsq->bts->sampling_mode)
475 btsq->done = 1;
476 err = 1;
477 goto out_put;
478 }
479
480 /* Currently there is no support for split buffers */
481 if (buffer->consecutive) {
482 err = -EINVAL;
483 goto out_put;
484 }
485
486 if (!buffer->data) {
487 int fd = perf_data__fd(btsq->bts->session->data);
488
489 buffer->data = auxtrace_buffer__get_data(buffer, fd);
490 if (!buffer->data) {
491 err = -ENOMEM;
492 goto out_put;
493 }
494 }
495
496 if (btsq->bts->snapshot_mode && !buffer->consecutive &&
497 intel_bts_do_fix_overlap(queue, buffer)) {
498 err = -ENOMEM;
499 goto out_put;
500 }
501
502 if (!btsq->bts->synth_opts.callchain &&
503 !btsq->bts->synth_opts.thread_stack && thread &&
504 (!old_buffer || btsq->bts->sampling_mode ||
505 (btsq->bts->snapshot_mode && !buffer->consecutive)))
506 thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);
507
508 err = intel_bts_process_buffer(btsq, buffer, thread);
509
510 auxtrace_buffer__drop_data(buffer);
511
512 btsq->buffer = auxtrace_buffer__next(queue, buffer);
513 if (btsq->buffer) {
514 if (timestamp)
515 *timestamp = btsq->buffer->reference;
516 } else {
517 if (!btsq->bts->sampling_mode)
518 btsq->done = 1;
519 }
520out_put:
521 thread__put(thread);
522 return err;
523}
524
525static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
526{
527 u64 ts = 0;
528 int ret;
529
530 while (1) {
531 ret = intel_bts_process_queue(btsq, &ts);
532 if (ret < 0)
533 return ret;
534 if (ret)
535 break;
536 }
537 return 0;
538}
539
540static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
541{
542 struct auxtrace_queues *queues = &bts->queues;
543 unsigned int i;
544
545 for (i = 0; i < queues->nr_queues; i++) {
546 struct auxtrace_queue *queue = &bts->queues.queue_array[i];
547 struct intel_bts_queue *btsq = queue->priv;
548
549 if (btsq && btsq->tid == tid)
550 return intel_bts_flush_queue(btsq);
551 }
552 return 0;
553}
554
555static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
556{
557 while (1) {
558 unsigned int queue_nr;
559 struct auxtrace_queue *queue;
560 struct intel_bts_queue *btsq;
561 u64 ts = 0;
562 int ret;
563
564 if (!bts->heap.heap_cnt)
565 return 0;
566
567 if (bts->heap.heap_array[0].ordinal > timestamp)
568 return 0;
569
570 queue_nr = bts->heap.heap_array[0].queue_nr;
571 queue = &bts->queues.queue_array[queue_nr];
572 btsq = queue->priv;
573
574 auxtrace_heap__pop(&bts->heap);
575
576 ret = intel_bts_process_queue(btsq, &ts);
577 if (ret < 0) {
578 auxtrace_heap__add(&bts->heap, queue_nr, ts);
579 return ret;
580 }
581
582 if (!ret) {
583 ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
584 if (ret < 0)
585 return ret;
586 } else {
587 btsq->on_heap = false;
588 }
589 }
590
591 return 0;
592}
593
594static int intel_bts_process_event(struct perf_session *session,
595 union perf_event *event,
596 struct perf_sample *sample,
597 const struct perf_tool *tool)
598{
599 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
600 auxtrace);
601 u64 timestamp;
602 int err;
603
604 if (dump_trace)
605 return 0;
606
607 if (!tool->ordered_events) {
608 pr_err("Intel BTS requires ordered events\n");
609 return -EINVAL;
610 }
611
612 if (sample->time && sample->time != (u64)-1)
613 timestamp = perf_time_to_tsc(sample->time, &bts->tc);
614 else
615 timestamp = 0;
616
617 err = intel_bts_update_queues(bts);
618 if (err)
619 return err;
620
621 err = intel_bts_process_queues(bts, timestamp);
622 if (err)
623 return err;
624 if (event->header.type == PERF_RECORD_EXIT) {
625 err = intel_bts_process_tid_exit(bts, event->fork.tid);
626 if (err)
627 return err;
628 }
629
630 if (event->header.type == PERF_RECORD_AUX &&
631 (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
632 bts->synth_opts.errors)
633 err = intel_bts_lost(bts, sample);
634
635 return err;
636}
637
638static int intel_bts_process_auxtrace_event(struct perf_session *session,
639 union perf_event *event,
640 const struct perf_tool *tool __maybe_unused)
641{
642 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
643 auxtrace);
644
645 if (bts->sampling_mode)
646 return 0;
647
648 if (!bts->data_queued) {
649 struct auxtrace_buffer *buffer;
650 off_t data_offset;
651 int fd = perf_data__fd(session->data);
652 int err;
653
654 if (perf_data__is_pipe(session->data)) {
655 data_offset = 0;
656 } else {
657 data_offset = lseek(fd, 0, SEEK_CUR);
658 if (data_offset == -1)
659 return -errno;
660 }
661
662 err = auxtrace_queues__add_event(&bts->queues, session, event,
663 data_offset, &buffer);
664 if (err)
665 return err;
666
667 /* Dump here now we have copied a piped trace out of the pipe */
668 if (dump_trace) {
669 if (auxtrace_buffer__get_data(buffer, fd)) {
670 intel_bts_dump_event(bts, buffer->data,
671 buffer->size);
672 auxtrace_buffer__put_data(buffer);
673 }
674 }
675 }
676
677 return 0;
678}
679
680static int intel_bts_flush(struct perf_session *session,
681 const struct perf_tool *tool __maybe_unused)
682{
683 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
684 auxtrace);
685 int ret;
686
687 if (dump_trace || bts->sampling_mode)
688 return 0;
689
690 if (!tool->ordered_events)
691 return -EINVAL;
692
693 ret = intel_bts_update_queues(bts);
694 if (ret < 0)
695 return ret;
696
697 return intel_bts_process_queues(bts, MAX_TIMESTAMP);
698}
699
700static void intel_bts_free_queue(void *priv)
701{
702 struct intel_bts_queue *btsq = priv;
703
704 if (!btsq)
705 return;
706 free(btsq);
707}
708
709static void intel_bts_free_events(struct perf_session *session)
710{
711 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
712 auxtrace);
713 struct auxtrace_queues *queues = &bts->queues;
714 unsigned int i;
715
716 for (i = 0; i < queues->nr_queues; i++) {
717 intel_bts_free_queue(queues->queue_array[i].priv);
718 queues->queue_array[i].priv = NULL;
719 }
720 auxtrace_queues__free(queues);
721}
722
723static void intel_bts_free(struct perf_session *session)
724{
725 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
726 auxtrace);
727
728 auxtrace_heap__free(&bts->heap);
729 intel_bts_free_events(session);
730 session->auxtrace = NULL;
731 free(bts);
732}
733
734static bool intel_bts_evsel_is_auxtrace(struct perf_session *session,
735 struct evsel *evsel)
736{
737 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
738 auxtrace);
739
740 return evsel->core.attr.type == bts->pmu_type;
741}
742
743static int intel_bts_synth_events(struct intel_bts *bts,
744 struct perf_session *session)
745{
746 struct evlist *evlist = session->evlist;
747 struct evsel *evsel;
748 struct perf_event_attr attr;
749 bool found = false;
750 u64 id;
751 int err;
752
753 evlist__for_each_entry(evlist, evsel) {
754 if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
755 found = true;
756 break;
757 }
758 }
759
760 if (!found) {
761 pr_debug("There are no selected events with Intel BTS data\n");
762 return 0;
763 }
764
765 memset(&attr, 0, sizeof(struct perf_event_attr));
766 attr.size = sizeof(struct perf_event_attr);
767 attr.type = PERF_TYPE_HARDWARE;
768 attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
769 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
770 PERF_SAMPLE_PERIOD;
771 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
772 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
773 attr.exclude_user = evsel->core.attr.exclude_user;
774 attr.exclude_kernel = evsel->core.attr.exclude_kernel;
775 attr.exclude_hv = evsel->core.attr.exclude_hv;
776 attr.exclude_host = evsel->core.attr.exclude_host;
777 attr.exclude_guest = evsel->core.attr.exclude_guest;
778 attr.sample_id_all = evsel->core.attr.sample_id_all;
779 attr.read_format = evsel->core.attr.read_format;
780
781 id = auxtrace_synth_id_range_start(evsel);
782
783 if (bts->synth_opts.branches) {
784 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
785 attr.sample_period = 1;
786 attr.sample_type |= PERF_SAMPLE_ADDR;
787 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
788 id, (u64)attr.sample_type);
789 err = perf_session__deliver_synth_attr_event(session, &attr, id);
790 if (err) {
791 pr_err("%s: failed to synthesize 'branches' event type\n",
792 __func__);
793 return err;
794 }
795 bts->sample_branches = true;
796 bts->branches_sample_type = attr.sample_type;
797 bts->branches_id = id;
798 /*
799 * We only use sample types from PERF_SAMPLE_MASK so we can use
800 * __evsel__sample_size() here.
801 */
802 bts->branches_event_size = sizeof(struct perf_record_sample) +
803 __evsel__sample_size(attr.sample_type);
804 }
805
806 return 0;
807}
808
809static const char * const intel_bts_info_fmts[] = {
810 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
811 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
812 [INTEL_BTS_TIME_MULT] = " Time Multiplier %"PRIu64"\n",
813 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
814 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
815 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
816};
817
818static void intel_bts_print_info(__u64 *arr, int start, int finish)
819{
820 int i;
821
822 if (!dump_trace)
823 return;
824
825 for (i = start; i <= finish; i++)
826 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
827}
828
829int intel_bts_process_auxtrace_info(union perf_event *event,
830 struct perf_session *session)
831{
832 struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
833 size_t min_sz = sizeof(u64) * (INTEL_BTS_SNAPSHOT_MODE + 1);
834 struct intel_bts *bts;
835 int err;
836
837 if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
838 min_sz)
839 return -EINVAL;
840
841 bts = zalloc(sizeof(struct intel_bts));
842 if (!bts)
843 return -ENOMEM;
844
845 err = auxtrace_queues__init(&bts->queues);
846 if (err)
847 goto err_free;
848
849 bts->session = session;
850 bts->machine = &session->machines.host; /* No kvm support */
851 bts->auxtrace_type = auxtrace_info->type;
852 bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
853 bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
854 bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
855 bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
856 bts->cap_user_time_zero =
857 auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
858 bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
859
860 bts->sampling_mode = false;
861
862 bts->auxtrace.process_event = intel_bts_process_event;
863 bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
864 bts->auxtrace.flush_events = intel_bts_flush;
865 bts->auxtrace.free_events = intel_bts_free_events;
866 bts->auxtrace.free = intel_bts_free;
867 bts->auxtrace.evsel_is_auxtrace = intel_bts_evsel_is_auxtrace;
868 session->auxtrace = &bts->auxtrace;
869
870 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
871 INTEL_BTS_SNAPSHOT_MODE);
872
873 if (dump_trace)
874 return 0;
875
876 if (session->itrace_synth_opts->set) {
877 bts->synth_opts = *session->itrace_synth_opts;
878 } else {
879 itrace_synth_opts__set_default(&bts->synth_opts,
880 session->itrace_synth_opts->default_no_sample);
881 bts->synth_opts.thread_stack =
882 session->itrace_synth_opts->thread_stack;
883 }
884
885 if (bts->synth_opts.calls)
886 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
887 PERF_IP_FLAG_TRACE_END;
888 if (bts->synth_opts.returns)
889 bts->branches_filter |= PERF_IP_FLAG_RETURN |
890 PERF_IP_FLAG_TRACE_BEGIN;
891
892 err = intel_bts_synth_events(bts, session);
893 if (err)
894 goto err_free_queues;
895
896 err = auxtrace_queues__process_index(&bts->queues, session);
897 if (err)
898 goto err_free_queues;
899
900 if (bts->queues.populated)
901 bts->data_queued = true;
902
903 return 0;
904
905err_free_queues:
906 auxtrace_queues__free(&bts->queues);
907 session->auxtrace = NULL;
908err_free:
909 free(bts);
910 return err;
911}