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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 == __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, " %08x: ", 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 = { .ip = 0, };
279
280 if (bts->synth_opts.initial_skip &&
281 bts->num_events++ <= bts->synth_opts.initial_skip)
282 return 0;
283
284 sample.ip = le64_to_cpu(branch->from);
285 sample.cpumode = intel_bts_cpumode(bts, sample.ip);
286 sample.pid = btsq->pid;
287 sample.tid = btsq->tid;
288 sample.addr = le64_to_cpu(branch->to);
289 sample.id = btsq->bts->branches_id;
290 sample.stream_id = btsq->bts->branches_id;
291 sample.period = 1;
292 sample.cpu = btsq->cpu;
293 sample.flags = btsq->sample_flags;
294 sample.insn_len = btsq->intel_pt_insn.length;
295 memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
296
297 event.sample.header.type = PERF_RECORD_SAMPLE;
298 event.sample.header.misc = sample.cpumode;
299 event.sample.header.size = sizeof(struct perf_event_header);
300
301 if (bts->synth_opts.inject) {
302 event.sample.header.size = bts->branches_event_size;
303 ret = perf_event__synthesize_sample(&event,
304 bts->branches_sample_type,
305 0, &sample);
306 if (ret)
307 return ret;
308 }
309
310 ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
311 if (ret)
312 pr_err("Intel BTS: failed to deliver branch event, error %d\n",
313 ret);
314
315 return ret;
316}
317
318static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
319{
320 struct machine *machine = btsq->bts->machine;
321 struct thread *thread;
322 unsigned char buf[INTEL_PT_INSN_BUF_SZ];
323 ssize_t len;
324 bool x86_64;
325 int err = -1;
326
327 thread = machine__find_thread(machine, -1, btsq->tid);
328 if (!thread)
329 return -1;
330
331 len = thread__memcpy(thread, machine, buf, ip, INTEL_PT_INSN_BUF_SZ, &x86_64);
332 if (len <= 0)
333 goto out_put;
334
335 if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
336 goto out_put;
337
338 err = 0;
339out_put:
340 thread__put(thread);
341 return err;
342}
343
344static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
345 pid_t tid, u64 ip)
346{
347 union perf_event event;
348 int err;
349
350 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
351 INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
352 "Failed to get instruction", 0);
353
354 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
355 if (err)
356 pr_err("Intel BTS: failed to deliver error event, error %d\n",
357 err);
358
359 return err;
360}
361
362static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
363 struct branch *branch)
364{
365 int err;
366
367 if (!branch->from) {
368 if (branch->to)
369 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
370 PERF_IP_FLAG_TRACE_BEGIN;
371 else
372 btsq->sample_flags = 0;
373 btsq->intel_pt_insn.length = 0;
374 } else if (!branch->to) {
375 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
376 PERF_IP_FLAG_TRACE_END;
377 btsq->intel_pt_insn.length = 0;
378 } else {
379 err = intel_bts_get_next_insn(btsq, branch->from);
380 if (err) {
381 btsq->sample_flags = 0;
382 btsq->intel_pt_insn.length = 0;
383 if (!btsq->bts->synth_opts.errors)
384 return 0;
385 err = intel_bts_synth_error(btsq->bts, btsq->cpu,
386 btsq->pid, btsq->tid,
387 branch->from);
388 return err;
389 }
390 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
391 /* Check for an async branch into the kernel */
392 if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
393 machine__kernel_ip(btsq->bts->machine, branch->to) &&
394 btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
395 PERF_IP_FLAG_CALL |
396 PERF_IP_FLAG_SYSCALLRET))
397 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
398 PERF_IP_FLAG_CALL |
399 PERF_IP_FLAG_ASYNC |
400 PERF_IP_FLAG_INTERRUPT;
401 }
402
403 return 0;
404}
405
406static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
407 struct auxtrace_buffer *buffer,
408 struct thread *thread)
409{
410 struct branch *branch;
411 size_t sz, bsz = sizeof(struct branch);
412 u32 filter = btsq->bts->branches_filter;
413 int err = 0;
414
415 if (buffer->use_data) {
416 sz = buffer->use_size;
417 branch = buffer->use_data;
418 } else {
419 sz = buffer->size;
420 branch = buffer->data;
421 }
422
423 if (!btsq->bts->sample_branches)
424 return 0;
425
426 for (; sz > bsz; branch += 1, sz -= bsz) {
427 if (!branch->from && !branch->to)
428 continue;
429 intel_bts_get_branch_type(btsq, branch);
430 if (btsq->bts->synth_opts.thread_stack)
431 thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
432 le64_to_cpu(branch->from),
433 le64_to_cpu(branch->to),
434 btsq->intel_pt_insn.length,
435 buffer->buffer_nr + 1);
436 if (filter && !(filter & btsq->sample_flags))
437 continue;
438 err = intel_bts_synth_branch_sample(btsq, branch);
439 if (err)
440 break;
441 }
442 return err;
443}
444
445static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
446{
447 struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
448 struct auxtrace_queue *queue;
449 struct thread *thread;
450 int err;
451
452 if (btsq->done)
453 return 1;
454
455 if (btsq->pid == -1) {
456 thread = machine__find_thread(btsq->bts->machine, -1,
457 btsq->tid);
458 if (thread)
459 btsq->pid = thread->pid_;
460 } else {
461 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
462 btsq->tid);
463 }
464
465 queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
466
467 if (!buffer)
468 buffer = auxtrace_buffer__next(queue, NULL);
469
470 if (!buffer) {
471 if (!btsq->bts->sampling_mode)
472 btsq->done = 1;
473 err = 1;
474 goto out_put;
475 }
476
477 /* Currently there is no support for split buffers */
478 if (buffer->consecutive) {
479 err = -EINVAL;
480 goto out_put;
481 }
482
483 if (!buffer->data) {
484 int fd = perf_data__fd(btsq->bts->session->data);
485
486 buffer->data = auxtrace_buffer__get_data(buffer, fd);
487 if (!buffer->data) {
488 err = -ENOMEM;
489 goto out_put;
490 }
491 }
492
493 if (btsq->bts->snapshot_mode && !buffer->consecutive &&
494 intel_bts_do_fix_overlap(queue, buffer)) {
495 err = -ENOMEM;
496 goto out_put;
497 }
498
499 if (!btsq->bts->synth_opts.callchain &&
500 !btsq->bts->synth_opts.thread_stack && thread &&
501 (!old_buffer || btsq->bts->sampling_mode ||
502 (btsq->bts->snapshot_mode && !buffer->consecutive)))
503 thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);
504
505 err = intel_bts_process_buffer(btsq, buffer, thread);
506
507 auxtrace_buffer__drop_data(buffer);
508
509 btsq->buffer = auxtrace_buffer__next(queue, buffer);
510 if (btsq->buffer) {
511 if (timestamp)
512 *timestamp = btsq->buffer->reference;
513 } else {
514 if (!btsq->bts->sampling_mode)
515 btsq->done = 1;
516 }
517out_put:
518 thread__put(thread);
519 return err;
520}
521
522static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
523{
524 u64 ts = 0;
525 int ret;
526
527 while (1) {
528 ret = intel_bts_process_queue(btsq, &ts);
529 if (ret < 0)
530 return ret;
531 if (ret)
532 break;
533 }
534 return 0;
535}
536
537static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
538{
539 struct auxtrace_queues *queues = &bts->queues;
540 unsigned int i;
541
542 for (i = 0; i < queues->nr_queues; i++) {
543 struct auxtrace_queue *queue = &bts->queues.queue_array[i];
544 struct intel_bts_queue *btsq = queue->priv;
545
546 if (btsq && btsq->tid == tid)
547 return intel_bts_flush_queue(btsq);
548 }
549 return 0;
550}
551
552static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
553{
554 while (1) {
555 unsigned int queue_nr;
556 struct auxtrace_queue *queue;
557 struct intel_bts_queue *btsq;
558 u64 ts = 0;
559 int ret;
560
561 if (!bts->heap.heap_cnt)
562 return 0;
563
564 if (bts->heap.heap_array[0].ordinal > timestamp)
565 return 0;
566
567 queue_nr = bts->heap.heap_array[0].queue_nr;
568 queue = &bts->queues.queue_array[queue_nr];
569 btsq = queue->priv;
570
571 auxtrace_heap__pop(&bts->heap);
572
573 ret = intel_bts_process_queue(btsq, &ts);
574 if (ret < 0) {
575 auxtrace_heap__add(&bts->heap, queue_nr, ts);
576 return ret;
577 }
578
579 if (!ret) {
580 ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
581 if (ret < 0)
582 return ret;
583 } else {
584 btsq->on_heap = false;
585 }
586 }
587
588 return 0;
589}
590
591static int intel_bts_process_event(struct perf_session *session,
592 union perf_event *event,
593 struct perf_sample *sample,
594 struct perf_tool *tool)
595{
596 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
597 auxtrace);
598 u64 timestamp;
599 int err;
600
601 if (dump_trace)
602 return 0;
603
604 if (!tool->ordered_events) {
605 pr_err("Intel BTS requires ordered events\n");
606 return -EINVAL;
607 }
608
609 if (sample->time && sample->time != (u64)-1)
610 timestamp = perf_time_to_tsc(sample->time, &bts->tc);
611 else
612 timestamp = 0;
613
614 err = intel_bts_update_queues(bts);
615 if (err)
616 return err;
617
618 err = intel_bts_process_queues(bts, timestamp);
619 if (err)
620 return err;
621 if (event->header.type == PERF_RECORD_EXIT) {
622 err = intel_bts_process_tid_exit(bts, event->fork.tid);
623 if (err)
624 return err;
625 }
626
627 if (event->header.type == PERF_RECORD_AUX &&
628 (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
629 bts->synth_opts.errors)
630 err = intel_bts_lost(bts, sample);
631
632 return err;
633}
634
635static int intel_bts_process_auxtrace_event(struct perf_session *session,
636 union perf_event *event,
637 struct perf_tool *tool __maybe_unused)
638{
639 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
640 auxtrace);
641
642 if (bts->sampling_mode)
643 return 0;
644
645 if (!bts->data_queued) {
646 struct auxtrace_buffer *buffer;
647 off_t data_offset;
648 int fd = perf_data__fd(session->data);
649 int err;
650
651 if (perf_data__is_pipe(session->data)) {
652 data_offset = 0;
653 } else {
654 data_offset = lseek(fd, 0, SEEK_CUR);
655 if (data_offset == -1)
656 return -errno;
657 }
658
659 err = auxtrace_queues__add_event(&bts->queues, session, event,
660 data_offset, &buffer);
661 if (err)
662 return err;
663
664 /* Dump here now we have copied a piped trace out of the pipe */
665 if (dump_trace) {
666 if (auxtrace_buffer__get_data(buffer, fd)) {
667 intel_bts_dump_event(bts, buffer->data,
668 buffer->size);
669 auxtrace_buffer__put_data(buffer);
670 }
671 }
672 }
673
674 return 0;
675}
676
677static int intel_bts_flush(struct perf_session *session,
678 struct perf_tool *tool __maybe_unused)
679{
680 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
681 auxtrace);
682 int ret;
683
684 if (dump_trace || bts->sampling_mode)
685 return 0;
686
687 if (!tool->ordered_events)
688 return -EINVAL;
689
690 ret = intel_bts_update_queues(bts);
691 if (ret < 0)
692 return ret;
693
694 return intel_bts_process_queues(bts, MAX_TIMESTAMP);
695}
696
697static void intel_bts_free_queue(void *priv)
698{
699 struct intel_bts_queue *btsq = priv;
700
701 if (!btsq)
702 return;
703 free(btsq);
704}
705
706static void intel_bts_free_events(struct perf_session *session)
707{
708 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
709 auxtrace);
710 struct auxtrace_queues *queues = &bts->queues;
711 unsigned int i;
712
713 for (i = 0; i < queues->nr_queues; i++) {
714 intel_bts_free_queue(queues->queue_array[i].priv);
715 queues->queue_array[i].priv = NULL;
716 }
717 auxtrace_queues__free(queues);
718}
719
720static void intel_bts_free(struct perf_session *session)
721{
722 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
723 auxtrace);
724
725 auxtrace_heap__free(&bts->heap);
726 intel_bts_free_events(session);
727 session->auxtrace = NULL;
728 free(bts);
729}
730
731struct intel_bts_synth {
732 struct perf_tool dummy_tool;
733 struct perf_session *session;
734};
735
736static int intel_bts_event_synth(struct perf_tool *tool,
737 union perf_event *event,
738 struct perf_sample *sample __maybe_unused,
739 struct machine *machine __maybe_unused)
740{
741 struct intel_bts_synth *intel_bts_synth =
742 container_of(tool, struct intel_bts_synth, dummy_tool);
743
744 return perf_session__deliver_synth_event(intel_bts_synth->session,
745 event, NULL);
746}
747
748static int intel_bts_synth_event(struct perf_session *session,
749 struct perf_event_attr *attr, u64 id)
750{
751 struct intel_bts_synth intel_bts_synth;
752
753 memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
754 intel_bts_synth.session = session;
755
756 return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
757 &id, intel_bts_event_synth);
758}
759
760static int intel_bts_synth_events(struct intel_bts *bts,
761 struct perf_session *session)
762{
763 struct evlist *evlist = session->evlist;
764 struct evsel *evsel;
765 struct perf_event_attr attr;
766 bool found = false;
767 u64 id;
768 int err;
769
770 evlist__for_each_entry(evlist, evsel) {
771 if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
772 found = true;
773 break;
774 }
775 }
776
777 if (!found) {
778 pr_debug("There are no selected events with Intel BTS data\n");
779 return 0;
780 }
781
782 memset(&attr, 0, sizeof(struct perf_event_attr));
783 attr.size = sizeof(struct perf_event_attr);
784 attr.type = PERF_TYPE_HARDWARE;
785 attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
786 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
787 PERF_SAMPLE_PERIOD;
788 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
789 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
790 attr.exclude_user = evsel->core.attr.exclude_user;
791 attr.exclude_kernel = evsel->core.attr.exclude_kernel;
792 attr.exclude_hv = evsel->core.attr.exclude_hv;
793 attr.exclude_host = evsel->core.attr.exclude_host;
794 attr.exclude_guest = evsel->core.attr.exclude_guest;
795 attr.sample_id_all = evsel->core.attr.sample_id_all;
796 attr.read_format = evsel->core.attr.read_format;
797
798 id = evsel->core.id[0] + 1000000000;
799 if (!id)
800 id = 1;
801
802 if (bts->synth_opts.branches) {
803 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
804 attr.sample_period = 1;
805 attr.sample_type |= PERF_SAMPLE_ADDR;
806 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
807 id, (u64)attr.sample_type);
808 err = intel_bts_synth_event(session, &attr, id);
809 if (err) {
810 pr_err("%s: failed to synthesize 'branches' event type\n",
811 __func__);
812 return err;
813 }
814 bts->sample_branches = true;
815 bts->branches_sample_type = attr.sample_type;
816 bts->branches_id = id;
817 /*
818 * We only use sample types from PERF_SAMPLE_MASK so we can use
819 * __perf_evsel__sample_size() here.
820 */
821 bts->branches_event_size = sizeof(struct perf_record_sample) +
822 __perf_evsel__sample_size(attr.sample_type);
823 }
824
825 return 0;
826}
827
828static const char * const intel_bts_info_fmts[] = {
829 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
830 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
831 [INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n",
832 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
833 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
834 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
835};
836
837static void intel_bts_print_info(__u64 *arr, int start, int finish)
838{
839 int i;
840
841 if (!dump_trace)
842 return;
843
844 for (i = start; i <= finish; i++)
845 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
846}
847
848int intel_bts_process_auxtrace_info(union perf_event *event,
849 struct perf_session *session)
850{
851 struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
852 size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
853 struct intel_bts *bts;
854 int err;
855
856 if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
857 min_sz)
858 return -EINVAL;
859
860 bts = zalloc(sizeof(struct intel_bts));
861 if (!bts)
862 return -ENOMEM;
863
864 err = auxtrace_queues__init(&bts->queues);
865 if (err)
866 goto err_free;
867
868 bts->session = session;
869 bts->machine = &session->machines.host; /* No kvm support */
870 bts->auxtrace_type = auxtrace_info->type;
871 bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
872 bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
873 bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
874 bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
875 bts->cap_user_time_zero =
876 auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
877 bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
878
879 bts->sampling_mode = false;
880
881 bts->auxtrace.process_event = intel_bts_process_event;
882 bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
883 bts->auxtrace.flush_events = intel_bts_flush;
884 bts->auxtrace.free_events = intel_bts_free_events;
885 bts->auxtrace.free = intel_bts_free;
886 session->auxtrace = &bts->auxtrace;
887
888 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
889 INTEL_BTS_SNAPSHOT_MODE);
890
891 if (dump_trace)
892 return 0;
893
894 if (session->itrace_synth_opts->set) {
895 bts->synth_opts = *session->itrace_synth_opts;
896 } else {
897 itrace_synth_opts__set_default(&bts->synth_opts,
898 session->itrace_synth_opts->default_no_sample);
899 bts->synth_opts.thread_stack =
900 session->itrace_synth_opts->thread_stack;
901 }
902
903 if (bts->synth_opts.calls)
904 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
905 PERF_IP_FLAG_TRACE_END;
906 if (bts->synth_opts.returns)
907 bts->branches_filter |= PERF_IP_FLAG_RETURN |
908 PERF_IP_FLAG_TRACE_BEGIN;
909
910 err = intel_bts_synth_events(bts, session);
911 if (err)
912 goto err_free_queues;
913
914 err = auxtrace_queues__process_index(&bts->queues, session);
915 if (err)
916 goto err_free_queues;
917
918 if (bts->queues.populated)
919 bts->data_queued = true;
920
921 return 0;
922
923err_free_queues:
924 auxtrace_queues__free(&bts->queues);
925 session->auxtrace = NULL;
926err_free:
927 free(bts);
928 return err;
929}
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 <errno.h>
18#include <byteswap.h>
19#include <inttypes.h>
20#include <linux/kernel.h>
21#include <linux/types.h>
22#include <linux/bitops.h>
23#include <linux/log2.h>
24
25#include "cpumap.h"
26#include "color.h"
27#include "evsel.h"
28#include "evlist.h"
29#include "machine.h"
30#include "session.h"
31#include "util.h"
32#include "thread.h"
33#include "thread-stack.h"
34#include "debug.h"
35#include "tsc.h"
36#include "auxtrace.h"
37#include "intel-pt-decoder/intel-pt-insn-decoder.h"
38#include "intel-bts.h"
39
40#define MAX_TIMESTAMP (~0ULL)
41
42#define INTEL_BTS_ERR_NOINSN 5
43#define INTEL_BTS_ERR_LOST 9
44
45#if __BYTE_ORDER == __BIG_ENDIAN
46#define le64_to_cpu bswap_64
47#else
48#define le64_to_cpu
49#endif
50
51struct intel_bts {
52 struct auxtrace auxtrace;
53 struct auxtrace_queues queues;
54 struct auxtrace_heap heap;
55 u32 auxtrace_type;
56 struct perf_session *session;
57 struct machine *machine;
58 bool sampling_mode;
59 bool snapshot_mode;
60 bool data_queued;
61 u32 pmu_type;
62 struct perf_tsc_conversion tc;
63 bool cap_user_time_zero;
64 struct itrace_synth_opts synth_opts;
65 bool sample_branches;
66 u32 branches_filter;
67 u64 branches_sample_type;
68 u64 branches_id;
69 size_t branches_event_size;
70 unsigned long num_events;
71};
72
73struct intel_bts_queue {
74 struct intel_bts *bts;
75 unsigned int queue_nr;
76 struct auxtrace_buffer *buffer;
77 bool on_heap;
78 bool done;
79 pid_t pid;
80 pid_t tid;
81 int cpu;
82 u64 time;
83 struct intel_pt_insn intel_pt_insn;
84 u32 sample_flags;
85};
86
87struct branch {
88 u64 from;
89 u64 to;
90 u64 misc;
91};
92
93static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
94 unsigned char *buf, size_t len)
95{
96 struct branch *branch;
97 size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
98 const char *color = PERF_COLOR_BLUE;
99
100 color_fprintf(stdout, color,
101 ". ... Intel BTS data: size %zu bytes\n",
102 len);
103
104 while (len) {
105 if (len >= br_sz)
106 sz = br_sz;
107 else
108 sz = len;
109 printf(".");
110 color_fprintf(stdout, color, " %08x: ", pos);
111 for (i = 0; i < sz; i++)
112 color_fprintf(stdout, color, " %02x", buf[i]);
113 for (; i < br_sz; i++)
114 color_fprintf(stdout, color, " ");
115 if (len >= br_sz) {
116 branch = (struct branch *)buf;
117 color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
118 le64_to_cpu(branch->from),
119 le64_to_cpu(branch->to),
120 le64_to_cpu(branch->misc) & 0x10 ?
121 "pred" : "miss");
122 } else {
123 color_fprintf(stdout, color, " Bad record!\n");
124 }
125 pos += sz;
126 buf += sz;
127 len -= sz;
128 }
129}
130
131static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
132 size_t len)
133{
134 printf(".\n");
135 intel_bts_dump(bts, buf, len);
136}
137
138static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
139{
140 union perf_event event;
141 int err;
142
143 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
144 INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
145 sample->tid, 0, "Lost trace data");
146
147 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
148 if (err)
149 pr_err("Intel BTS: failed to deliver error event, error %d\n",
150 err);
151
152 return err;
153}
154
155static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
156 unsigned int queue_nr)
157{
158 struct intel_bts_queue *btsq;
159
160 btsq = zalloc(sizeof(struct intel_bts_queue));
161 if (!btsq)
162 return NULL;
163
164 btsq->bts = bts;
165 btsq->queue_nr = queue_nr;
166 btsq->pid = -1;
167 btsq->tid = -1;
168 btsq->cpu = -1;
169
170 return btsq;
171}
172
173static int intel_bts_setup_queue(struct intel_bts *bts,
174 struct auxtrace_queue *queue,
175 unsigned int queue_nr)
176{
177 struct intel_bts_queue *btsq = queue->priv;
178
179 if (list_empty(&queue->head))
180 return 0;
181
182 if (!btsq) {
183 btsq = intel_bts_alloc_queue(bts, queue_nr);
184 if (!btsq)
185 return -ENOMEM;
186 queue->priv = btsq;
187
188 if (queue->cpu != -1)
189 btsq->cpu = queue->cpu;
190 btsq->tid = queue->tid;
191 }
192
193 if (bts->sampling_mode)
194 return 0;
195
196 if (!btsq->on_heap && !btsq->buffer) {
197 int ret;
198
199 btsq->buffer = auxtrace_buffer__next(queue, NULL);
200 if (!btsq->buffer)
201 return 0;
202
203 ret = auxtrace_heap__add(&bts->heap, queue_nr,
204 btsq->buffer->reference);
205 if (ret)
206 return ret;
207 btsq->on_heap = true;
208 }
209
210 return 0;
211}
212
213static int intel_bts_setup_queues(struct intel_bts *bts)
214{
215 unsigned int i;
216 int ret;
217
218 for (i = 0; i < bts->queues.nr_queues; i++) {
219 ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
220 i);
221 if (ret)
222 return ret;
223 }
224 return 0;
225}
226
227static inline int intel_bts_update_queues(struct intel_bts *bts)
228{
229 if (bts->queues.new_data) {
230 bts->queues.new_data = false;
231 return intel_bts_setup_queues(bts);
232 }
233 return 0;
234}
235
236static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
237 unsigned char *buf_b, size_t len_b)
238{
239 size_t offs, len;
240
241 if (len_a > len_b)
242 offs = len_a - len_b;
243 else
244 offs = 0;
245
246 for (; offs < len_a; offs += sizeof(struct branch)) {
247 len = len_a - offs;
248 if (!memcmp(buf_a + offs, buf_b, len))
249 return buf_b + len;
250 }
251
252 return buf_b;
253}
254
255static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
256 struct auxtrace_buffer *b)
257{
258 struct auxtrace_buffer *a;
259 void *start;
260
261 if (b->list.prev == &queue->head)
262 return 0;
263 a = list_entry(b->list.prev, struct auxtrace_buffer, list);
264 start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
265 if (!start)
266 return -EINVAL;
267 b->use_size = b->data + b->size - start;
268 b->use_data = start;
269 return 0;
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 = { .ip = 0, };
279
280 if (bts->synth_opts.initial_skip &&
281 bts->num_events++ <= bts->synth_opts.initial_skip)
282 return 0;
283
284 event.sample.header.type = PERF_RECORD_SAMPLE;
285 event.sample.header.misc = PERF_RECORD_MISC_USER;
286 event.sample.header.size = sizeof(struct perf_event_header);
287
288 sample.cpumode = PERF_RECORD_MISC_USER;
289 sample.ip = le64_to_cpu(branch->from);
290 sample.pid = btsq->pid;
291 sample.tid = btsq->tid;
292 sample.addr = le64_to_cpu(branch->to);
293 sample.id = btsq->bts->branches_id;
294 sample.stream_id = btsq->bts->branches_id;
295 sample.period = 1;
296 sample.cpu = btsq->cpu;
297 sample.flags = btsq->sample_flags;
298 sample.insn_len = btsq->intel_pt_insn.length;
299 memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
300
301 if (bts->synth_opts.inject) {
302 event.sample.header.size = bts->branches_event_size;
303 ret = perf_event__synthesize_sample(&event,
304 bts->branches_sample_type,
305 0, &sample);
306 if (ret)
307 return ret;
308 }
309
310 ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
311 if (ret)
312 pr_err("Intel BTS: failed to deliver branch event, error %d\n",
313 ret);
314
315 return ret;
316}
317
318static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
319{
320 struct machine *machine = btsq->bts->machine;
321 struct thread *thread;
322 struct addr_location al;
323 unsigned char buf[INTEL_PT_INSN_BUF_SZ];
324 ssize_t len;
325 int x86_64;
326 uint8_t cpumode;
327 int err = -1;
328
329 if (machine__kernel_ip(machine, ip))
330 cpumode = PERF_RECORD_MISC_KERNEL;
331 else
332 cpumode = PERF_RECORD_MISC_USER;
333
334 thread = machine__find_thread(machine, -1, btsq->tid);
335 if (!thread)
336 return -1;
337
338 thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
339 if (!al.map || !al.map->dso)
340 goto out_put;
341
342 len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf,
343 INTEL_PT_INSN_BUF_SZ);
344 if (len <= 0)
345 goto out_put;
346
347 /* Load maps to ensure dso->is_64_bit has been updated */
348 map__load(al.map);
349
350 x86_64 = al.map->dso->is_64_bit;
351
352 if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
353 goto out_put;
354
355 err = 0;
356out_put:
357 thread__put(thread);
358 return err;
359}
360
361static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
362 pid_t tid, u64 ip)
363{
364 union perf_event event;
365 int err;
366
367 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
368 INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
369 "Failed to get instruction");
370
371 err = perf_session__deliver_synth_event(bts->session, &event, NULL);
372 if (err)
373 pr_err("Intel BTS: failed to deliver error event, error %d\n",
374 err);
375
376 return err;
377}
378
379static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
380 struct branch *branch)
381{
382 int err;
383
384 if (!branch->from) {
385 if (branch->to)
386 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
387 PERF_IP_FLAG_TRACE_BEGIN;
388 else
389 btsq->sample_flags = 0;
390 btsq->intel_pt_insn.length = 0;
391 } else if (!branch->to) {
392 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
393 PERF_IP_FLAG_TRACE_END;
394 btsq->intel_pt_insn.length = 0;
395 } else {
396 err = intel_bts_get_next_insn(btsq, branch->from);
397 if (err) {
398 btsq->sample_flags = 0;
399 btsq->intel_pt_insn.length = 0;
400 if (!btsq->bts->synth_opts.errors)
401 return 0;
402 err = intel_bts_synth_error(btsq->bts, btsq->cpu,
403 btsq->pid, btsq->tid,
404 branch->from);
405 return err;
406 }
407 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
408 /* Check for an async branch into the kernel */
409 if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
410 machine__kernel_ip(btsq->bts->machine, branch->to) &&
411 btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
412 PERF_IP_FLAG_CALL |
413 PERF_IP_FLAG_SYSCALLRET))
414 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
415 PERF_IP_FLAG_CALL |
416 PERF_IP_FLAG_ASYNC |
417 PERF_IP_FLAG_INTERRUPT;
418 }
419
420 return 0;
421}
422
423static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
424 struct auxtrace_buffer *buffer,
425 struct thread *thread)
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 (btsq->bts->synth_opts.thread_stack)
448 thread_stack__event(thread, btsq->sample_flags,
449 le64_to_cpu(branch->from),
450 le64_to_cpu(branch->to),
451 btsq->intel_pt_insn.length,
452 buffer->buffer_nr + 1);
453 if (filter && !(filter & btsq->sample_flags))
454 continue;
455 err = intel_bts_synth_branch_sample(btsq, branch);
456 if (err)
457 break;
458 }
459 return err;
460}
461
462static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
463{
464 struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
465 struct auxtrace_queue *queue;
466 struct thread *thread;
467 int err;
468
469 if (btsq->done)
470 return 1;
471
472 if (btsq->pid == -1) {
473 thread = machine__find_thread(btsq->bts->machine, -1,
474 btsq->tid);
475 if (thread)
476 btsq->pid = thread->pid_;
477 } else {
478 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
479 btsq->tid);
480 }
481
482 queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
483
484 if (!buffer)
485 buffer = auxtrace_buffer__next(queue, NULL);
486
487 if (!buffer) {
488 if (!btsq->bts->sampling_mode)
489 btsq->done = 1;
490 err = 1;
491 goto out_put;
492 }
493
494 /* Currently there is no support for split buffers */
495 if (buffer->consecutive) {
496 err = -EINVAL;
497 goto out_put;
498 }
499
500 if (!buffer->data) {
501 int fd = perf_data__fd(btsq->bts->session->data);
502
503 buffer->data = auxtrace_buffer__get_data(buffer, fd);
504 if (!buffer->data) {
505 err = -ENOMEM;
506 goto out_put;
507 }
508 }
509
510 if (btsq->bts->snapshot_mode && !buffer->consecutive &&
511 intel_bts_do_fix_overlap(queue, buffer)) {
512 err = -ENOMEM;
513 goto out_put;
514 }
515
516 if (!btsq->bts->synth_opts.callchain &&
517 !btsq->bts->synth_opts.thread_stack && thread &&
518 (!old_buffer || btsq->bts->sampling_mode ||
519 (btsq->bts->snapshot_mode && !buffer->consecutive)))
520 thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1);
521
522 err = intel_bts_process_buffer(btsq, buffer, thread);
523
524 auxtrace_buffer__drop_data(buffer);
525
526 btsq->buffer = auxtrace_buffer__next(queue, buffer);
527 if (btsq->buffer) {
528 if (timestamp)
529 *timestamp = btsq->buffer->reference;
530 } else {
531 if (!btsq->bts->sampling_mode)
532 btsq->done = 1;
533 }
534out_put:
535 thread__put(thread);
536 return err;
537}
538
539static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
540{
541 u64 ts = 0;
542 int ret;
543
544 while (1) {
545 ret = intel_bts_process_queue(btsq, &ts);
546 if (ret < 0)
547 return ret;
548 if (ret)
549 break;
550 }
551 return 0;
552}
553
554static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
555{
556 struct auxtrace_queues *queues = &bts->queues;
557 unsigned int i;
558
559 for (i = 0; i < queues->nr_queues; i++) {
560 struct auxtrace_queue *queue = &bts->queues.queue_array[i];
561 struct intel_bts_queue *btsq = queue->priv;
562
563 if (btsq && btsq->tid == tid)
564 return intel_bts_flush_queue(btsq);
565 }
566 return 0;
567}
568
569static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
570{
571 while (1) {
572 unsigned int queue_nr;
573 struct auxtrace_queue *queue;
574 struct intel_bts_queue *btsq;
575 u64 ts = 0;
576 int ret;
577
578 if (!bts->heap.heap_cnt)
579 return 0;
580
581 if (bts->heap.heap_array[0].ordinal > timestamp)
582 return 0;
583
584 queue_nr = bts->heap.heap_array[0].queue_nr;
585 queue = &bts->queues.queue_array[queue_nr];
586 btsq = queue->priv;
587
588 auxtrace_heap__pop(&bts->heap);
589
590 ret = intel_bts_process_queue(btsq, &ts);
591 if (ret < 0) {
592 auxtrace_heap__add(&bts->heap, queue_nr, ts);
593 return ret;
594 }
595
596 if (!ret) {
597 ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
598 if (ret < 0)
599 return ret;
600 } else {
601 btsq->on_heap = false;
602 }
603 }
604
605 return 0;
606}
607
608static int intel_bts_process_event(struct perf_session *session,
609 union perf_event *event,
610 struct perf_sample *sample,
611 struct perf_tool *tool)
612{
613 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
614 auxtrace);
615 u64 timestamp;
616 int err;
617
618 if (dump_trace)
619 return 0;
620
621 if (!tool->ordered_events) {
622 pr_err("Intel BTS requires ordered events\n");
623 return -EINVAL;
624 }
625
626 if (sample->time && sample->time != (u64)-1)
627 timestamp = perf_time_to_tsc(sample->time, &bts->tc);
628 else
629 timestamp = 0;
630
631 err = intel_bts_update_queues(bts);
632 if (err)
633 return err;
634
635 err = intel_bts_process_queues(bts, timestamp);
636 if (err)
637 return err;
638 if (event->header.type == PERF_RECORD_EXIT) {
639 err = intel_bts_process_tid_exit(bts, event->fork.tid);
640 if (err)
641 return err;
642 }
643
644 if (event->header.type == PERF_RECORD_AUX &&
645 (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
646 bts->synth_opts.errors)
647 err = intel_bts_lost(bts, sample);
648
649 return err;
650}
651
652static int intel_bts_process_auxtrace_event(struct perf_session *session,
653 union perf_event *event,
654 struct perf_tool *tool __maybe_unused)
655{
656 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
657 auxtrace);
658
659 if (bts->sampling_mode)
660 return 0;
661
662 if (!bts->data_queued) {
663 struct auxtrace_buffer *buffer;
664 off_t data_offset;
665 int fd = perf_data__fd(session->data);
666 int err;
667
668 if (perf_data__is_pipe(session->data)) {
669 data_offset = 0;
670 } else {
671 data_offset = lseek(fd, 0, SEEK_CUR);
672 if (data_offset == -1)
673 return -errno;
674 }
675
676 err = auxtrace_queues__add_event(&bts->queues, session, event,
677 data_offset, &buffer);
678 if (err)
679 return err;
680
681 /* Dump here now we have copied a piped trace out of the pipe */
682 if (dump_trace) {
683 if (auxtrace_buffer__get_data(buffer, fd)) {
684 intel_bts_dump_event(bts, buffer->data,
685 buffer->size);
686 auxtrace_buffer__put_data(buffer);
687 }
688 }
689 }
690
691 return 0;
692}
693
694static int intel_bts_flush(struct perf_session *session,
695 struct perf_tool *tool __maybe_unused)
696{
697 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
698 auxtrace);
699 int ret;
700
701 if (dump_trace || bts->sampling_mode)
702 return 0;
703
704 if (!tool->ordered_events)
705 return -EINVAL;
706
707 ret = intel_bts_update_queues(bts);
708 if (ret < 0)
709 return ret;
710
711 return intel_bts_process_queues(bts, MAX_TIMESTAMP);
712}
713
714static void intel_bts_free_queue(void *priv)
715{
716 struct intel_bts_queue *btsq = priv;
717
718 if (!btsq)
719 return;
720 free(btsq);
721}
722
723static void intel_bts_free_events(struct perf_session *session)
724{
725 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
726 auxtrace);
727 struct auxtrace_queues *queues = &bts->queues;
728 unsigned int i;
729
730 for (i = 0; i < queues->nr_queues; i++) {
731 intel_bts_free_queue(queues->queue_array[i].priv);
732 queues->queue_array[i].priv = NULL;
733 }
734 auxtrace_queues__free(queues);
735}
736
737static void intel_bts_free(struct perf_session *session)
738{
739 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
740 auxtrace);
741
742 auxtrace_heap__free(&bts->heap);
743 intel_bts_free_events(session);
744 session->auxtrace = NULL;
745 free(bts);
746}
747
748struct intel_bts_synth {
749 struct perf_tool dummy_tool;
750 struct perf_session *session;
751};
752
753static int intel_bts_event_synth(struct perf_tool *tool,
754 union perf_event *event,
755 struct perf_sample *sample __maybe_unused,
756 struct machine *machine __maybe_unused)
757{
758 struct intel_bts_synth *intel_bts_synth =
759 container_of(tool, struct intel_bts_synth, dummy_tool);
760
761 return perf_session__deliver_synth_event(intel_bts_synth->session,
762 event, NULL);
763}
764
765static int intel_bts_synth_event(struct perf_session *session,
766 struct perf_event_attr *attr, u64 id)
767{
768 struct intel_bts_synth intel_bts_synth;
769
770 memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
771 intel_bts_synth.session = session;
772
773 return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
774 &id, intel_bts_event_synth);
775}
776
777static int intel_bts_synth_events(struct intel_bts *bts,
778 struct perf_session *session)
779{
780 struct perf_evlist *evlist = session->evlist;
781 struct perf_evsel *evsel;
782 struct perf_event_attr attr;
783 bool found = false;
784 u64 id;
785 int err;
786
787 evlist__for_each_entry(evlist, evsel) {
788 if (evsel->attr.type == bts->pmu_type && evsel->ids) {
789 found = true;
790 break;
791 }
792 }
793
794 if (!found) {
795 pr_debug("There are no selected events with Intel BTS data\n");
796 return 0;
797 }
798
799 memset(&attr, 0, sizeof(struct perf_event_attr));
800 attr.size = sizeof(struct perf_event_attr);
801 attr.type = PERF_TYPE_HARDWARE;
802 attr.sample_type = evsel->attr.sample_type & PERF_SAMPLE_MASK;
803 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
804 PERF_SAMPLE_PERIOD;
805 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
806 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
807 attr.exclude_user = evsel->attr.exclude_user;
808 attr.exclude_kernel = evsel->attr.exclude_kernel;
809 attr.exclude_hv = evsel->attr.exclude_hv;
810 attr.exclude_host = evsel->attr.exclude_host;
811 attr.exclude_guest = evsel->attr.exclude_guest;
812 attr.sample_id_all = evsel->attr.sample_id_all;
813 attr.read_format = evsel->attr.read_format;
814
815 id = evsel->id[0] + 1000000000;
816 if (!id)
817 id = 1;
818
819 if (bts->synth_opts.branches) {
820 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
821 attr.sample_period = 1;
822 attr.sample_type |= PERF_SAMPLE_ADDR;
823 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
824 id, (u64)attr.sample_type);
825 err = intel_bts_synth_event(session, &attr, id);
826 if (err) {
827 pr_err("%s: failed to synthesize 'branches' event type\n",
828 __func__);
829 return err;
830 }
831 bts->sample_branches = true;
832 bts->branches_sample_type = attr.sample_type;
833 bts->branches_id = id;
834 /*
835 * We only use sample types from PERF_SAMPLE_MASK so we can use
836 * __perf_evsel__sample_size() here.
837 */
838 bts->branches_event_size = sizeof(struct sample_event) +
839 __perf_evsel__sample_size(attr.sample_type);
840 }
841
842 return 0;
843}
844
845static const char * const intel_bts_info_fmts[] = {
846 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
847 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
848 [INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n",
849 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
850 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
851 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
852};
853
854static void intel_bts_print_info(u64 *arr, int start, int finish)
855{
856 int i;
857
858 if (!dump_trace)
859 return;
860
861 for (i = start; i <= finish; i++)
862 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
863}
864
865int intel_bts_process_auxtrace_info(union perf_event *event,
866 struct perf_session *session)
867{
868 struct auxtrace_info_event *auxtrace_info = &event->auxtrace_info;
869 size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
870 struct intel_bts *bts;
871 int err;
872
873 if (auxtrace_info->header.size < sizeof(struct auxtrace_info_event) +
874 min_sz)
875 return -EINVAL;
876
877 bts = zalloc(sizeof(struct intel_bts));
878 if (!bts)
879 return -ENOMEM;
880
881 err = auxtrace_queues__init(&bts->queues);
882 if (err)
883 goto err_free;
884
885 bts->session = session;
886 bts->machine = &session->machines.host; /* No kvm support */
887 bts->auxtrace_type = auxtrace_info->type;
888 bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
889 bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
890 bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
891 bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
892 bts->cap_user_time_zero =
893 auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
894 bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
895
896 bts->sampling_mode = false;
897
898 bts->auxtrace.process_event = intel_bts_process_event;
899 bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
900 bts->auxtrace.flush_events = intel_bts_flush;
901 bts->auxtrace.free_events = intel_bts_free_events;
902 bts->auxtrace.free = intel_bts_free;
903 session->auxtrace = &bts->auxtrace;
904
905 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
906 INTEL_BTS_SNAPSHOT_MODE);
907
908 if (dump_trace)
909 return 0;
910
911 if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
912 bts->synth_opts = *session->itrace_synth_opts;
913 } else {
914 itrace_synth_opts__set_default(&bts->synth_opts);
915 if (session->itrace_synth_opts)
916 bts->synth_opts.thread_stack =
917 session->itrace_synth_opts->thread_stack;
918 }
919
920 if (bts->synth_opts.calls)
921 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
922 PERF_IP_FLAG_TRACE_END;
923 if (bts->synth_opts.returns)
924 bts->branches_filter |= PERF_IP_FLAG_RETURN |
925 PERF_IP_FLAG_TRACE_BEGIN;
926
927 err = intel_bts_synth_events(bts, session);
928 if (err)
929 goto err_free_queues;
930
931 err = auxtrace_queues__process_index(&bts->queues, session);
932 if (err)
933 goto err_free_queues;
934
935 if (bts->queues.populated)
936 bts->data_queued = true;
937
938 return 0;
939
940err_free_queues:
941 auxtrace_queues__free(&bts->queues);
942 session->auxtrace = NULL;
943err_free:
944 free(bts);
945 return err;
946}