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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 | ||
49 | struct 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 | ||
71 | struct 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 | ||
85 | struct branch { | |
86 | u64 from; | |
87 | u64 to; | |
88 | u64 misc; | |
89 | }; | |
90 | ||
91 | static 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 | ||
129 | static 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 | ||
136 | static 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 | ||
153 | static 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 | ||
171 | static 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 | ||
211 | static 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 | ||
225 | static 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 | ||
234 | static 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 | ||
253 | static 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 | ||
270 | static 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 | ||
3ea223ad | 282 | sample.cpumode = PERF_RECORD_MISC_USER; |
d0170af7 AH |
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 | ||
312 | static 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; | |
352 | out_put: | |
353 | thread__put(thread); | |
354 | return err; | |
355 | } | |
356 | ||
357 | static 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 | ||
375 | static 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 | ||
419 | static 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 | ||
451 | static 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 | } | |
522 | out_put: | |
523 | thread__put(thread); | |
524 | return err; | |
525 | } | |
526 | ||
527 | static 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 | ||
542 | static 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 | ||
557 | static 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 | ||
596 | static 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) { | |
53ff6bc3 | 627 | err = intel_bts_process_tid_exit(bts, event->fork.tid); |
d0170af7 AH |
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 | ||
640 | static 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 | ||
b8f8eb84 | 682 | static int intel_bts_flush(struct perf_session *session, |
d0170af7 AH |
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 | ||
702 | static 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 | ||
711 | static 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 | ||
725 | static 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 | ||
736 | struct intel_bts_synth { | |
737 | struct perf_tool dummy_tool; | |
738 | struct perf_session *session; | |
739 | }; | |
740 | ||
741 | static 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 | ||
753 | static 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 | ||
765 | static 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 | ||
835 | static 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 | ||
844 | static 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 | ||
855 | u64 intel_bts_auxtrace_info_priv[INTEL_BTS_AUXTRACE_PRIV_SIZE]; | |
856 | ||
857 | int 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 | ||
928 | err_free_queues: | |
929 | auxtrace_queues__free(&bts->queues); | |
930 | session->auxtrace = NULL; | |
931 | err_free: | |
932 | free(bts); | |
933 | return err; | |
934 | } |