1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * intel-bts.c: Intel Processor Trace support
4 * Copyright (c) 2013-2015, Intel Corporation.
5 */
6
7 #include <endian.h>
8 #include <errno.h>
9 #include <byteswap.h>
10 #include <inttypes.h>
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/bitops.h>
14 #include <linux/log2.h>
15 #include <linux/zalloc.h>
16
17 #include "color.h"
18 #include "evsel.h"
19 #include "evlist.h"
20 #include "machine.h"
21 #include "symbol.h"
22 #include "session.h"
23 #include "tool.h"
24 #include "thread.h"
25 #include "thread-stack.h"
26 #include "debug.h"
27 #include "tsc.h"
28 #include "auxtrace.h"
29 #include "intel-pt-decoder/intel-pt-insn-decoder.h"
30 #include "intel-bts.h"
31 #include "util/synthetic-events.h"
32
33 #define MAX_TIMESTAMP (~0ULL)
34
35 #define INTEL_BTS_ERR_NOINSN 5
36 #define INTEL_BTS_ERR_LOST 9
37
38 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
39 #define le64_to_cpu bswap_64
40 #else
41 #define le64_to_cpu
42 #endif
43
44 struct 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
66 struct 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
80 struct branch {
81 u64 from;
82 u64 to;
83 u64 misc;
84 };
85
intel_bts_dump(struct intel_bts * bts __maybe_unused,unsigned char * buf,size_t len)86 static 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
intel_bts_dump_event(struct intel_bts * bts,unsigned char * buf,size_t len)124 static 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
intel_bts_lost(struct intel_bts * bts,struct perf_sample * sample)131 static 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
intel_bts_alloc_queue(struct intel_bts * bts,unsigned int queue_nr)148 static 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
intel_bts_setup_queue(struct intel_bts * bts,struct auxtrace_queue * queue,unsigned int queue_nr)166 static 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
intel_bts_setup_queues(struct intel_bts * bts)206 static 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
intel_bts_update_queues(struct intel_bts * bts)220 static 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
intel_bts_find_overlap(unsigned char * buf_a,size_t len_a,unsigned char * buf_b,size_t len_b)229 static 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
intel_bts_do_fix_overlap(struct auxtrace_queue * queue,struct auxtrace_buffer * b)248 static 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
intel_bts_cpumode(struct intel_bts * bts,uint64_t ip)265 static 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
intel_bts_synth_branch_sample(struct intel_bts_queue * btsq,struct branch * branch)272 static 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
intel_bts_get_next_insn(struct intel_bts_queue * btsq,u64 ip)318 static 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;
339 out_put:
340 thread__put(thread);
341 return err;
342 }
343
intel_bts_synth_error(struct intel_bts * bts,int cpu,pid_t pid,pid_t tid,u64 ip)344 static 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
intel_bts_get_branch_type(struct intel_bts_queue * btsq,struct branch * branch)362 static 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
intel_bts_process_buffer(struct intel_bts_queue * btsq,struct auxtrace_buffer * buffer,struct thread * thread)406 static 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, true, 0, 0);
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
intel_bts_process_queue(struct intel_bts_queue * btsq,u64 * timestamp)445 static 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(thread);
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 }
517 out_put:
518 thread__put(thread);
519 return err;
520 }
521
intel_bts_flush_queue(struct intel_bts_queue * btsq)522 static 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
intel_bts_process_tid_exit(struct intel_bts * bts,pid_t tid)537 static 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
intel_bts_process_queues(struct intel_bts * bts,u64 timestamp)552 static 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
intel_bts_process_event(struct perf_session * session,union perf_event * event,struct perf_sample * sample,struct perf_tool * tool)591 static 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
intel_bts_process_auxtrace_event(struct perf_session * session,union perf_event * event,struct perf_tool * tool __maybe_unused)635 static 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
intel_bts_flush(struct perf_session * session,struct perf_tool * tool __maybe_unused)677 static 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
intel_bts_free_queue(void * priv)697 static 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
intel_bts_free_events(struct perf_session * session)706 static 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
intel_bts_free(struct perf_session * session)720 static 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
intel_bts_evsel_is_auxtrace(struct perf_session * session,struct evsel * evsel)731 static bool intel_bts_evsel_is_auxtrace(struct perf_session *session,
732 struct evsel *evsel)
733 {
734 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
735 auxtrace);
736
737 return evsel->core.attr.type == bts->pmu_type;
738 }
739
740 struct intel_bts_synth {
741 struct perf_tool dummy_tool;
742 struct perf_session *session;
743 };
744
intel_bts_event_synth(struct perf_tool * tool,union perf_event * event,struct perf_sample * sample __maybe_unused,struct machine * machine __maybe_unused)745 static int intel_bts_event_synth(struct perf_tool *tool,
746 union perf_event *event,
747 struct perf_sample *sample __maybe_unused,
748 struct machine *machine __maybe_unused)
749 {
750 struct intel_bts_synth *intel_bts_synth =
751 container_of(tool, struct intel_bts_synth, dummy_tool);
752
753 return perf_session__deliver_synth_event(intel_bts_synth->session,
754 event, NULL);
755 }
756
intel_bts_synth_event(struct perf_session * session,struct perf_event_attr * attr,u64 id)757 static int intel_bts_synth_event(struct perf_session *session,
758 struct perf_event_attr *attr, u64 id)
759 {
760 struct intel_bts_synth intel_bts_synth;
761
762 memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
763 intel_bts_synth.session = session;
764
765 return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
766 &id, intel_bts_event_synth);
767 }
768
intel_bts_synth_events(struct intel_bts * bts,struct perf_session * session)769 static int intel_bts_synth_events(struct intel_bts *bts,
770 struct perf_session *session)
771 {
772 struct evlist *evlist = session->evlist;
773 struct evsel *evsel;
774 struct perf_event_attr attr;
775 bool found = false;
776 u64 id;
777 int err;
778
779 evlist__for_each_entry(evlist, evsel) {
780 if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
781 found = true;
782 break;
783 }
784 }
785
786 if (!found) {
787 pr_debug("There are no selected events with Intel BTS data\n");
788 return 0;
789 }
790
791 memset(&attr, 0, sizeof(struct perf_event_attr));
792 attr.size = sizeof(struct perf_event_attr);
793 attr.type = PERF_TYPE_HARDWARE;
794 attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
795 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
796 PERF_SAMPLE_PERIOD;
797 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
798 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
799 attr.exclude_user = evsel->core.attr.exclude_user;
800 attr.exclude_kernel = evsel->core.attr.exclude_kernel;
801 attr.exclude_hv = evsel->core.attr.exclude_hv;
802 attr.exclude_host = evsel->core.attr.exclude_host;
803 attr.exclude_guest = evsel->core.attr.exclude_guest;
804 attr.sample_id_all = evsel->core.attr.sample_id_all;
805 attr.read_format = evsel->core.attr.read_format;
806
807 id = evsel->core.id[0] + 1000000000;
808 if (!id)
809 id = 1;
810
811 if (bts->synth_opts.branches) {
812 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
813 attr.sample_period = 1;
814 attr.sample_type |= PERF_SAMPLE_ADDR;
815 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
816 id, (u64)attr.sample_type);
817 err = intel_bts_synth_event(session, &attr, id);
818 if (err) {
819 pr_err("%s: failed to synthesize 'branches' event type\n",
820 __func__);
821 return err;
822 }
823 bts->sample_branches = true;
824 bts->branches_sample_type = attr.sample_type;
825 bts->branches_id = id;
826 /*
827 * We only use sample types from PERF_SAMPLE_MASK so we can use
828 * __evsel__sample_size() here.
829 */
830 bts->branches_event_size = sizeof(struct perf_record_sample) +
831 __evsel__sample_size(attr.sample_type);
832 }
833
834 return 0;
835 }
836
837 static const char * const intel_bts_info_fmts[] = {
838 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n",
839 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n",
840 [INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n",
841 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n",
842 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n",
843 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n",
844 };
845
intel_bts_print_info(__u64 * arr,int start,int finish)846 static void intel_bts_print_info(__u64 *arr, int start, int finish)
847 {
848 int i;
849
850 if (!dump_trace)
851 return;
852
853 for (i = start; i <= finish; i++)
854 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
855 }
856
intel_bts_process_auxtrace_info(union perf_event * event,struct perf_session * session)857 int intel_bts_process_auxtrace_info(union perf_event *event,
858 struct perf_session *session)
859 {
860 struct perf_record_auxtrace_info *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 perf_record_auxtrace_info) +
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 bts->auxtrace.evsel_is_auxtrace = intel_bts_evsel_is_auxtrace;
896 session->auxtrace = &bts->auxtrace;
897
898 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
899 INTEL_BTS_SNAPSHOT_MODE);
900
901 if (dump_trace)
902 return 0;
903
904 if (session->itrace_synth_opts->set) {
905 bts->synth_opts = *session->itrace_synth_opts;
906 } else {
907 itrace_synth_opts__set_default(&bts->synth_opts,
908 session->itrace_synth_opts->default_no_sample);
909 bts->synth_opts.thread_stack =
910 session->itrace_synth_opts->thread_stack;
911 }
912
913 if (bts->synth_opts.calls)
914 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
915 PERF_IP_FLAG_TRACE_END;
916 if (bts->synth_opts.returns)
917 bts->branches_filter |= PERF_IP_FLAG_RETURN |
918 PERF_IP_FLAG_TRACE_BEGIN;
919
920 err = intel_bts_synth_events(bts, session);
921 if (err)
922 goto err_free_queues;
923
924 err = auxtrace_queues__process_index(&bts->queues, session);
925 if (err)
926 goto err_free_queues;
927
928 if (bts->queues.populated)
929 bts->data_queued = true;
930
931 return 0;
932
933 err_free_queues:
934 auxtrace_queues__free(&bts->queues);
935 session->auxtrace = NULL;
936 err_free:
937 free(bts);
938 return err;
939 }
940