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