summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/intel-bts.c
blob: af1e78d76228d88ffd7ca07bde719a930d35f48f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
// SPDX-License-Identifier: GPL-2.0-only
/*
 * intel-bts.c: Intel Processor Trace support
 * Copyright (c) 2013-2015, Intel Corporation.
 */

#include <endian.h>
#include <errno.h>
#include <byteswap.h>
#include <inttypes.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include <linux/zalloc.h>

#include "color.h"
#include "evsel.h"
#include "evlist.h"
#include "machine.h"
#include "symbol.h"
#include "session.h"
#include "tool.h"
#include "thread.h"
#include "thread-stack.h"
#include "debug.h"
#include "tsc.h"
#include "auxtrace.h"
#include "intel-pt-decoder/intel-pt-insn-decoder.h"
#include "intel-bts.h"
#include "util/synthetic-events.h"

#define MAX_TIMESTAMP (~0ULL)

#define INTEL_BTS_ERR_NOINSN  5
#define INTEL_BTS_ERR_LOST    9

#if __BYTE_ORDER == __BIG_ENDIAN
#define le64_to_cpu bswap_64
#else
#define le64_to_cpu
#endif

struct intel_bts {
	struct auxtrace			auxtrace;
	struct auxtrace_queues		queues;
	struct auxtrace_heap		heap;
	u32				auxtrace_type;
	struct perf_session		*session;
	struct machine			*machine;
	bool				sampling_mode;
	bool				snapshot_mode;
	bool				data_queued;
	u32				pmu_type;
	struct perf_tsc_conversion	tc;
	bool				cap_user_time_zero;
	struct itrace_synth_opts	synth_opts;
	bool				sample_branches;
	u32				branches_filter;
	u64				branches_sample_type;
	u64				branches_id;
	size_t				branches_event_size;
	unsigned long			num_events;
};

struct intel_bts_queue {
	struct intel_bts	*bts;
	unsigned int		queue_nr;
	struct auxtrace_buffer	*buffer;
	bool			on_heap;
	bool			done;
	pid_t			pid;
	pid_t			tid;
	int			cpu;
	u64			time;
	struct intel_pt_insn	intel_pt_insn;
	u32			sample_flags;
};

struct branch {
	u64 from;
	u64 to;
	u64 misc;
};

static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
			   unsigned char *buf, size_t len)
{
	struct branch *branch;
	size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
	const char *color = PERF_COLOR_BLUE;

	color_fprintf(stdout, color,
		      ". ... Intel BTS data: size %zu bytes\n",
		      len);

	while (len) {
		if (len >= br_sz)
			sz = br_sz;
		else
			sz = len;
		printf(".");
		color_fprintf(stdout, color, "  %08x: ", pos);
		for (i = 0; i < sz; i++)
			color_fprintf(stdout, color, " %02x", buf[i]);
		for (; i < br_sz; i++)
			color_fprintf(stdout, color, "   ");
		if (len >= br_sz) {
			branch = (struct branch *)buf;
			color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
				      le64_to_cpu(branch->from),
				      le64_to_cpu(branch->to),
				      le64_to_cpu(branch->misc) & 0x10 ?
							"pred" : "miss");
		} else {
			color_fprintf(stdout, color, " Bad record!\n");
		}
		pos += sz;
		buf += sz;
		len -= sz;
	}
}

static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
				 size_t len)
{
	printf(".\n");
	intel_bts_dump(bts, buf, len);
}

static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
{
	union perf_event event;
	int err;

	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
			     INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
			     sample->tid, 0, "Lost trace data", sample->time);

	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
	if (err)
		pr_err("Intel BTS: failed to deliver error event, error %d\n",
		       err);

	return err;
}

static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
						     unsigned int queue_nr)
{
	struct intel_bts_queue *btsq;

	btsq = zalloc(sizeof(struct intel_bts_queue));
	if (!btsq)
		return NULL;

	btsq->bts = bts;
	btsq->queue_nr = queue_nr;
	btsq->pid = -1;
	btsq->tid = -1;
	btsq->cpu = -1;

	return btsq;
}

static int intel_bts_setup_queue(struct intel_bts *bts,
				 struct auxtrace_queue *queue,
				 unsigned int queue_nr)
{
	struct intel_bts_queue *btsq = queue->priv;

	if (list_empty(&queue->head))
		return 0;

	if (!btsq) {
		btsq = intel_bts_alloc_queue(bts, queue_nr);
		if (!btsq)
			return -ENOMEM;
		queue->priv = btsq;

		if (queue->cpu != -1)
			btsq->cpu = queue->cpu;
		btsq->tid = queue->tid;
	}

	if (bts->sampling_mode)
		return 0;

	if (!btsq->on_heap && !btsq->buffer) {
		int ret;

		btsq->buffer = auxtrace_buffer__next(queue, NULL);
		if (!btsq->buffer)
			return 0;

		ret = auxtrace_heap__add(&bts->heap, queue_nr,
					 btsq->buffer->reference);
		if (ret)
			return ret;
		btsq->on_heap = true;
	}

	return 0;
}

static int intel_bts_setup_queues(struct intel_bts *bts)
{
	unsigned int i;
	int ret;

	for (i = 0; i < bts->queues.nr_queues; i++) {
		ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
					    i);
		if (ret)
			return ret;
	}
	return 0;
}

static inline int intel_bts_update_queues(struct intel_bts *bts)
{
	if (bts->queues.new_data) {
		bts->queues.new_data = false;
		return intel_bts_setup_queues(bts);
	}
	return 0;
}

static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
					     unsigned char *buf_b, size_t len_b)
{
	size_t offs, len;

	if (len_a > len_b)
		offs = len_a - len_b;
	else
		offs = 0;

	for (; offs < len_a; offs += sizeof(struct branch)) {
		len = len_a - offs;
		if (!memcmp(buf_a + offs, buf_b, len))
			return buf_b + len;
	}

	return buf_b;
}

static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
				    struct auxtrace_buffer *b)
{
	struct auxtrace_buffer *a;
	void *start;

	if (b->list.prev == &queue->head)
		return 0;
	a = list_entry(b->list.prev, struct auxtrace_buffer, list);
	start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
	if (!start)
		return -EINVAL;
	b->use_size = b->data + b->size - start;
	b->use_data = start;
	return 0;
}

static inline u8 intel_bts_cpumode(struct intel_bts *bts, uint64_t ip)
{
	return machine__kernel_ip(bts->machine, ip) ?
	       PERF_RECORD_MISC_KERNEL :
	       PERF_RECORD_MISC_USER;
}

static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
					 struct branch *branch)
{
	int ret;
	struct intel_bts *bts = btsq->bts;
	union perf_event event;
	struct perf_sample sample = { .ip = 0, };

	if (bts->synth_opts.initial_skip &&
	    bts->num_events++ <= bts->synth_opts.initial_skip)
		return 0;

	sample.ip = le64_to_cpu(branch->from);
	sample.cpumode = intel_bts_cpumode(bts, sample.ip);
	sample.pid = btsq->pid;
	sample.tid = btsq->tid;
	sample.addr = le64_to_cpu(branch->to);
	sample.id = btsq->bts->branches_id;
	sample.stream_id = btsq->bts->branches_id;
	sample.period = 1;
	sample.cpu = btsq->cpu;
	sample.flags = btsq->sample_flags;
	sample.insn_len = btsq->intel_pt_insn.length;
	memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);

	event.sample.header.type = PERF_RECORD_SAMPLE;
	event.sample.header.misc = sample.cpumode;
	event.sample.header.size = sizeof(struct perf_event_header);

	if (bts->synth_opts.inject) {
		event.sample.header.size = bts->branches_event_size;
		ret = perf_event__synthesize_sample(&event,
						    bts->branches_sample_type,
						    0, &sample);
		if (ret)
			return ret;
	}

	ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
	if (ret)
		pr_err("Intel BTS: failed to deliver branch event, error %d\n",
		       ret);

	return ret;
}

static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
{
	struct machine *machine = btsq->bts->machine;
	struct thread *thread;
	unsigned char buf[INTEL_PT_INSN_BUF_SZ];
	ssize_t len;
	bool x86_64;
	int err = -1;

	thread = machine__find_thread(machine, -1, btsq->tid);
	if (!thread)
		return -1;

	len = thread__memcpy(thread, machine, buf, ip, INTEL_PT_INSN_BUF_SZ, &x86_64);
	if (len <= 0)
		goto out_put;

	if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
		goto out_put;

	err = 0;
out_put:
	thread__put(thread);
	return err;
}

static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
				 pid_t tid, u64 ip)
{
	union perf_event event;
	int err;

	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
			     INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
			     "Failed to get instruction", 0);

	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
	if (err)
		pr_err("Intel BTS: failed to deliver error event, error %d\n",
		       err);

	return err;
}

static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
				     struct branch *branch)
{
	int err;

	if (!branch->from) {
		if (branch->to)
			btsq->sample_flags = PERF_IP_FLAG_BRANCH |
					     PERF_IP_FLAG_TRACE_BEGIN;
		else
			btsq->sample_flags = 0;
		btsq->intel_pt_insn.length = 0;
	} else if (!branch->to) {
		btsq->sample_flags = PERF_IP_FLAG_BRANCH |
				     PERF_IP_FLAG_TRACE_END;
		btsq->intel_pt_insn.length = 0;
	} else {
		err = intel_bts_get_next_insn(btsq, branch->from);
		if (err) {
			btsq->sample_flags = 0;
			btsq->intel_pt_insn.length = 0;
			if (!btsq->bts->synth_opts.errors)
				return 0;
			err = intel_bts_synth_error(btsq->bts, btsq->cpu,
						    btsq->pid, btsq->tid,
						    branch->from);
			return err;
		}
		btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
		/* Check for an async branch into the kernel */
		if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
		    machine__kernel_ip(btsq->bts->machine, branch->to) &&
		    btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
					   PERF_IP_FLAG_CALL |
					   PERF_IP_FLAG_SYSCALLRET))
			btsq->sample_flags = PERF_IP_FLAG_BRANCH |
					     PERF_IP_FLAG_CALL |
					     PERF_IP_FLAG_ASYNC |
					     PERF_IP_FLAG_INTERRUPT;
	}

	return 0;
}

static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
				    struct auxtrace_buffer *buffer,
				    struct thread *thread)
{
	struct branch *branch;
	size_t sz, bsz = sizeof(struct branch);
	u32 filter = btsq->bts->branches_filter;
	int err = 0;

	if (buffer->use_data) {
		sz = buffer->use_size;
		branch = buffer->use_data;
	} else {
		sz = buffer->size;
		branch = buffer->data;
	}

	if (!btsq->bts->sample_branches)
		return 0;

	for (; sz > bsz; branch += 1, sz -= bsz) {
		if (!branch->from && !branch->to)
			continue;
		intel_bts_get_branch_type(btsq, branch);
		if (btsq->bts->synth_opts.thread_stack)
			thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
					    le64_to_cpu(branch->from),
					    le64_to_cpu(branch->to),
					    btsq->intel_pt_insn.length,
					    buffer->buffer_nr + 1, true, 0, 0);
		if (filter && !(filter & btsq->sample_flags))
			continue;
		err = intel_bts_synth_branch_sample(btsq, branch);
		if (err)
			break;
	}
	return err;
}

static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
{
	struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
	struct auxtrace_queue *queue;
	struct thread *thread;
	int err;

	if (btsq->done)
		return 1;

	if (btsq->pid == -1) {
		thread = machine__find_thread(btsq->bts->machine, -1,
					      btsq->tid);
		if (thread)
			btsq->pid = thread->pid_;
	} else {
		thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
						 btsq->tid);
	}

	queue = &btsq->bts->queues.queue_array[btsq->queue_nr];

	if (!buffer)
		buffer = auxtrace_buffer__next(queue, NULL);

	if (!buffer) {
		if (!btsq->bts->sampling_mode)
			btsq->done = 1;
		err = 1;
		goto out_put;
	}

	/* Currently there is no support for split buffers */
	if (buffer->consecutive) {
		err = -EINVAL;
		goto out_put;
	}

	if (!buffer->data) {
		int fd = perf_data__fd(btsq->bts->session->data);

		buffer->data = auxtrace_buffer__get_data(buffer, fd);
		if (!buffer->data) {
			err = -ENOMEM;
			goto out_put;
		}
	}

	if (btsq->bts->snapshot_mode && !buffer->consecutive &&
	    intel_bts_do_fix_overlap(queue, buffer)) {
		err = -ENOMEM;
		goto out_put;
	}

	if (!btsq->bts->synth_opts.callchain &&
	    !btsq->bts->synth_opts.thread_stack && thread &&
	    (!old_buffer || btsq->bts->sampling_mode ||
	     (btsq->bts->snapshot_mode && !buffer->consecutive)))
		thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);

	err = intel_bts_process_buffer(btsq, buffer, thread);

	auxtrace_buffer__drop_data(buffer);

	btsq->buffer = auxtrace_buffer__next(queue, buffer);
	if (btsq->buffer) {
		if (timestamp)
			*timestamp = btsq->buffer->reference;
	} else {
		if (!btsq->bts->sampling_mode)
			btsq->done = 1;
	}
out_put:
	thread__put(thread);
	return err;
}

static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
{
	u64 ts = 0;
	int ret;

	while (1) {
		ret = intel_bts_process_queue(btsq, &ts);
		if (ret < 0)
			return ret;
		if (ret)
			break;
	}
	return 0;
}

static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
{
	struct auxtrace_queues *queues = &bts->queues;
	unsigned int i;

	for (i = 0; i < queues->nr_queues; i++) {
		struct auxtrace_queue *queue = &bts->queues.queue_array[i];
		struct intel_bts_queue *btsq = queue->priv;

		if (btsq && btsq->tid == tid)
			return intel_bts_flush_queue(btsq);
	}
	return 0;
}

static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
{
	while (1) {
		unsigned int queue_nr;
		struct auxtrace_queue *queue;
		struct intel_bts_queue *btsq;
		u64 ts = 0;
		int ret;

		if (!bts->heap.heap_cnt)
			return 0;

		if (bts->heap.heap_array[0].ordinal > timestamp)
			return 0;

		queue_nr = bts->heap.heap_array[0].queue_nr;
		queue = &bts->queues.queue_array[queue_nr];
		btsq = queue->priv;

		auxtrace_heap__pop(&bts->heap);

		ret = intel_bts_process_queue(btsq, &ts);
		if (ret < 0) {
			auxtrace_heap__add(&bts->heap, queue_nr, ts);
			return ret;
		}

		if (!ret) {
			ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
			if (ret < 0)
				return ret;
		} else {
			btsq->on_heap = false;
		}
	}

	return 0;
}

static int intel_bts_process_event(struct perf_session *session,
				   union perf_event *event,
				   struct perf_sample *sample,
				   struct perf_tool *tool)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);
	u64 timestamp;
	int err;

	if (dump_trace)
		return 0;

	if (!tool->ordered_events) {
		pr_err("Intel BTS requires ordered events\n");
		return -EINVAL;
	}

	if (sample->time && sample->time != (u64)-1)
		timestamp = perf_time_to_tsc(sample->time, &bts->tc);
	else
		timestamp = 0;

	err = intel_bts_update_queues(bts);
	if (err)
		return err;

	err = intel_bts_process_queues(bts, timestamp);
	if (err)
		return err;
	if (event->header.type == PERF_RECORD_EXIT) {
		err = intel_bts_process_tid_exit(bts, event->fork.tid);
		if (err)
			return err;
	}

	if (event->header.type == PERF_RECORD_AUX &&
	    (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
	    bts->synth_opts.errors)
		err = intel_bts_lost(bts, sample);

	return err;
}

static int intel_bts_process_auxtrace_event(struct perf_session *session,
					    union perf_event *event,
					    struct perf_tool *tool __maybe_unused)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);

	if (bts->sampling_mode)
		return 0;

	if (!bts->data_queued) {
		struct auxtrace_buffer *buffer;
		off_t data_offset;
		int fd = perf_data__fd(session->data);
		int err;

		if (perf_data__is_pipe(session->data)) {
			data_offset = 0;
		} else {
			data_offset = lseek(fd, 0, SEEK_CUR);
			if (data_offset == -1)
				return -errno;
		}

		err = auxtrace_queues__add_event(&bts->queues, session, event,
						 data_offset, &buffer);
		if (err)
			return err;

		/* Dump here now we have copied a piped trace out of the pipe */
		if (dump_trace) {
			if (auxtrace_buffer__get_data(buffer, fd)) {
				intel_bts_dump_event(bts, buffer->data,
						     buffer->size);
				auxtrace_buffer__put_data(buffer);
			}
		}
	}

	return 0;
}

static int intel_bts_flush(struct perf_session *session,
			   struct perf_tool *tool __maybe_unused)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);
	int ret;

	if (dump_trace || bts->sampling_mode)
		return 0;

	if (!tool->ordered_events)
		return -EINVAL;

	ret = intel_bts_update_queues(bts);
	if (ret < 0)
		return ret;

	return intel_bts_process_queues(bts, MAX_TIMESTAMP);
}

static void intel_bts_free_queue(void *priv)
{
	struct intel_bts_queue *btsq = priv;

	if (!btsq)
		return;
	free(btsq);
}

static void intel_bts_free_events(struct perf_session *session)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);
	struct auxtrace_queues *queues = &bts->queues;
	unsigned int i;

	for (i = 0; i < queues->nr_queues; i++) {
		intel_bts_free_queue(queues->queue_array[i].priv);
		queues->queue_array[i].priv = NULL;
	}
	auxtrace_queues__free(queues);
}

static void intel_bts_free(struct perf_session *session)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);

	auxtrace_heap__free(&bts->heap);
	intel_bts_free_events(session);
	session->auxtrace = NULL;
	free(bts);
}

static bool intel_bts_evsel_is_auxtrace(struct perf_session *session,
					struct evsel *evsel)
{
	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
					     auxtrace);

	return evsel->core.attr.type == bts->pmu_type;
}

struct intel_bts_synth {
	struct perf_tool dummy_tool;
	struct perf_session *session;
};

static int intel_bts_event_synth(struct perf_tool *tool,
				 union perf_event *event,
				 struct perf_sample *sample __maybe_unused,
				 struct machine *machine __maybe_unused)
{
	struct intel_bts_synth *intel_bts_synth =
			container_of(tool, struct intel_bts_synth, dummy_tool);

	return perf_session__deliver_synth_event(intel_bts_synth->session,
						 event, NULL);
}

static int intel_bts_synth_event(struct perf_session *session,
				 struct perf_event_attr *attr, u64 id)
{
	struct intel_bts_synth intel_bts_synth;

	memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
	intel_bts_synth.session = session;

	return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
					   &id, intel_bts_event_synth);
}

static int intel_bts_synth_events(struct intel_bts *bts,
				  struct perf_session *session)
{
	struct evlist *evlist = session->evlist;
	struct evsel *evsel;
	struct perf_event_attr attr;
	bool found = false;
	u64 id;
	int err;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
			found = true;
			break;
		}
	}

	if (!found) {
		pr_debug("There are no selected events with Intel BTS data\n");
		return 0;
	}

	memset(&attr, 0, sizeof(struct perf_event_attr));
	attr.size = sizeof(struct perf_event_attr);
	attr.type = PERF_TYPE_HARDWARE;
	attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
	attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
			    PERF_SAMPLE_PERIOD;
	attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
	attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
	attr.exclude_user = evsel->core.attr.exclude_user;
	attr.exclude_kernel = evsel->core.attr.exclude_kernel;
	attr.exclude_hv = evsel->core.attr.exclude_hv;
	attr.exclude_host = evsel->core.attr.exclude_host;
	attr.exclude_guest = evsel->core.attr.exclude_guest;
	attr.sample_id_all = evsel->core.attr.sample_id_all;
	attr.read_format = evsel->core.attr.read_format;

	id = evsel->core.id[0] + 1000000000;
	if (!id)
		id = 1;

	if (bts->synth_opts.branches) {
		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
		attr.sample_period = 1;
		attr.sample_type |= PERF_SAMPLE_ADDR;
		pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
			 id, (u64)attr.sample_type);
		err = intel_bts_synth_event(session, &attr, id);
		if (err) {
			pr_err("%s: failed to synthesize 'branches' event type\n",
			       __func__);
			return err;
		}
		bts->sample_branches = true;
		bts->branches_sample_type = attr.sample_type;
		bts->branches_id = id;
		/*
		 * We only use sample types from PERF_SAMPLE_MASK so we can use
		 * __evsel__sample_size() here.
		 */
		bts->branches_event_size = sizeof(struct perf_record_sample) +
					   __evsel__sample_size(attr.sample_type);
	}

	return 0;
}

static const char * const intel_bts_info_fmts[] = {
	[INTEL_BTS_PMU_TYPE]		= "  PMU Type           %"PRId64"\n",
	[INTEL_BTS_TIME_SHIFT]		= "  Time Shift         %"PRIu64"\n",
	[INTEL_BTS_TIME_MULT]		= "  Time Muliplier     %"PRIu64"\n",
	[INTEL_BTS_TIME_ZERO]		= "  Time Zero          %"PRIu64"\n",
	[INTEL_BTS_CAP_USER_TIME_ZERO]	= "  Cap Time Zero      %"PRId64"\n",
	[INTEL_BTS_SNAPSHOT_MODE]	= "  Snapshot mode      %"PRId64"\n",
};

static void intel_bts_print_info(__u64 *arr, int start, int finish)
{
	int i;

	if (!dump_trace)
		return;

	for (i = start; i <= finish; i++)
		fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
}

int intel_bts_process_auxtrace_info(union perf_event *event,
				    struct perf_session *session)
{
	struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
	size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
	struct intel_bts *bts;
	int err;

	if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
					min_sz)
		return -EINVAL;

	bts = zalloc(sizeof(struct intel_bts));
	if (!bts)
		return -ENOMEM;

	err = auxtrace_queues__init(&bts->queues);
	if (err)
		goto err_free;

	bts->session = session;
	bts->machine = &session->machines.host; /* No kvm support */
	bts->auxtrace_type = auxtrace_info->type;
	bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
	bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
	bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
	bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
	bts->cap_user_time_zero =
			auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
	bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];

	bts->sampling_mode = false;

	bts->auxtrace.process_event = intel_bts_process_event;
	bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
	bts->auxtrace.flush_events = intel_bts_flush;
	bts->auxtrace.free_events = intel_bts_free_events;
	bts->auxtrace.free = intel_bts_free;
	bts->auxtrace.evsel_is_auxtrace = intel_bts_evsel_is_auxtrace;
	session->auxtrace = &bts->auxtrace;

	intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
			     INTEL_BTS_SNAPSHOT_MODE);

	if (dump_trace)
		return 0;

	if (session->itrace_synth_opts->set) {
		bts->synth_opts = *session->itrace_synth_opts;
	} else {
		itrace_synth_opts__set_default(&bts->synth_opts,
				session->itrace_synth_opts->default_no_sample);
		bts->synth_opts.thread_stack =
				session->itrace_synth_opts->thread_stack;
	}

	if (bts->synth_opts.calls)
		bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
					PERF_IP_FLAG_TRACE_END;
	if (bts->synth_opts.returns)
		bts->branches_filter |= PERF_IP_FLAG_RETURN |
					PERF_IP_FLAG_TRACE_BEGIN;

	err = intel_bts_synth_events(bts, session);
	if (err)
		goto err_free_queues;

	err = auxtrace_queues__process_index(&bts->queues, session);
	if (err)
		goto err_free_queues;

	if (bts->queues.populated)
		bts->data_queued = true;

	return 0;

err_free_queues:
	auxtrace_queues__free(&bts->queues);
	session->auxtrace = NULL;
err_free:
	free(bts);
	return err;
}