intel-bts.c

  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
 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, "  %08zx: ", 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;
279
280	if (bts->synth_opts.initial_skip &&
281	    bts->num_events++ <= bts->synth_opts.initial_skip)
282		return 0;
283
284	perf_sample__init(&sample, /*all=*/true);
285	sample.ip = le64_to_cpu(branch->from);
286	sample.cpumode = intel_bts_cpumode(bts, sample.ip);
287	sample.pid = btsq->pid;
288	sample.tid = btsq->tid;
289	sample.addr = le64_to_cpu(branch->to);
290	sample.id = btsq->bts->branches_id;
291	sample.stream_id = btsq->bts->branches_id;
292	sample.period = 1;
293	sample.cpu = btsq->cpu;
294	sample.flags = btsq->sample_flags;
295	sample.insn_len = btsq->intel_pt_insn.length;
296	memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
297
298	event.sample.header.type = PERF_RECORD_SAMPLE;
299	event.sample.header.misc = sample.cpumode;
300	event.sample.header.size = sizeof(struct perf_event_header);
301
302	if (bts->synth_opts.inject) {
303		event.sample.header.size = bts->branches_event_size;
304		ret = perf_event__synthesize_sample(&event,
305						    bts->branches_sample_type,
306						    0, &sample);
307		if (ret)
308			return ret;
309	}
310
311	ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
312	if (ret)
313		pr_err("Intel BTS: failed to deliver branch event, error %d\n",
314		       ret);
315
316	perf_sample__exit(&sample);
317	return ret;
318}
319
320static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
321{
322	struct machine *machine = btsq->bts->machine;
323	struct thread *thread;
324	unsigned char buf[INTEL_PT_INSN_BUF_SZ];
325	ssize_t len;
326	bool x86_64;
327	int err = -1;
328
329	thread = machine__find_thread(machine, -1, btsq->tid);
330	if (!thread)
331		return -1;
332
333	len = thread__memcpy(thread, machine, buf, ip, INTEL_PT_INSN_BUF_SZ, &x86_64);
334	if (len <= 0)
335		goto out_put;
336
337	if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
338		goto out_put;
339
340	err = 0;
341out_put:
342	thread__put(thread);
343	return err;
344}
345
346static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
347				 pid_t tid, u64 ip)
348{
349	union perf_event event;
350	int err;
351
352	auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
353			     INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
354			     "Failed to get instruction", 0);
355
356	err = perf_session__deliver_synth_event(bts->session, &event, NULL);
357	if (err)
358		pr_err("Intel BTS: failed to deliver error event, error %d\n",
359		       err);
360
361	return err;
362}
363
364static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
365				     struct branch *branch)
366{
367	int err;
368
369	if (!branch->from) {
370		if (branch->to)
371			btsq->sample_flags = PERF_IP_FLAG_BRANCH |
372					     PERF_IP_FLAG_TRACE_BEGIN;
373		else
374			btsq->sample_flags = 0;
375		btsq->intel_pt_insn.length = 0;
376	} else if (!branch->to) {
377		btsq->sample_flags = PERF_IP_FLAG_BRANCH |
378				     PERF_IP_FLAG_TRACE_END;
379		btsq->intel_pt_insn.length = 0;
380	} else {
381		err = intel_bts_get_next_insn(btsq, branch->from);
382		if (err) {
383			btsq->sample_flags = 0;
384			btsq->intel_pt_insn.length = 0;
385			if (!btsq->bts->synth_opts.errors)
386				return 0;
387			err = intel_bts_synth_error(btsq->bts, btsq->cpu,
388						    btsq->pid, btsq->tid,
389						    branch->from);
390			return err;
391		}
392		btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
393		/* Check for an async branch into the kernel */
394		if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
395		    machine__kernel_ip(btsq->bts->machine, branch->to) &&
396		    btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
397					   PERF_IP_FLAG_CALL |
398					   PERF_IP_FLAG_SYSCALLRET))
399			btsq->sample_flags = PERF_IP_FLAG_BRANCH |
400					     PERF_IP_FLAG_CALL |
401					     PERF_IP_FLAG_ASYNC |
402					     PERF_IP_FLAG_INTERRUPT;
403	}
404
405	return 0;
406}
407
408static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
409				    struct auxtrace_buffer *buffer,
410				    struct thread *thread)
411{
412	struct branch *branch;
413	size_t sz, bsz = sizeof(struct branch);
414	u32 filter = btsq->bts->branches_filter;
415	int err = 0;
416
417	if (buffer->use_data) {
418		sz = buffer->use_size;
419		branch = buffer->use_data;
420	} else {
421		sz = buffer->size;
422		branch = buffer->data;
423	}
424
425	if (!btsq->bts->sample_branches)
426		return 0;
427
428	for (; sz > bsz; branch += 1, sz -= bsz) {
429		if (!branch->from && !branch->to)
430			continue;
431		intel_bts_get_branch_type(btsq, branch);
432		if (btsq->bts->synth_opts.thread_stack)
433			thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
434					    le64_to_cpu(branch->from),
435					    le64_to_cpu(branch->to),
436					    btsq->intel_pt_insn.length,
437					    buffer->buffer_nr + 1, true, 0, 0);
438		if (filter && !(filter & btsq->sample_flags))
439			continue;
440		err = intel_bts_synth_branch_sample(btsq, branch);
441		if (err)
442			break;
443	}
444	return err;
445}
446
447static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
448{
449	struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
450	struct auxtrace_queue *queue;
451	struct thread *thread;
452	int err;
453
454	if (btsq->done)
455		return 1;
456
457	if (btsq->pid == -1) {
458		thread = machine__find_thread(btsq->bts->machine, -1,
459					      btsq->tid);
460		if (thread)
461			btsq->pid = thread__pid(thread);
462	} else {
463		thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
464						 btsq->tid);
465	}
466
467	queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
468
469	if (!buffer)
470		buffer = auxtrace_buffer__next(queue, NULL);
471
472	if (!buffer) {
473		if (!btsq->bts->sampling_mode)
474			btsq->done = 1;
475		err = 1;
476		goto out_put;
477	}
478
479	/* Currently there is no support for split buffers */
480	if (buffer->consecutive) {
481		err = -EINVAL;
482		goto out_put;
483	}
484
485	if (!buffer->data) {
486		int fd = perf_data__fd(btsq->bts->session->data);
487
488		buffer->data = auxtrace_buffer__get_data(buffer, fd);
489		if (!buffer->data) {
490			err = -ENOMEM;
491			goto out_put;
492		}
493	}
494
495	if (btsq->bts->snapshot_mode && !buffer->consecutive &&
496	    intel_bts_do_fix_overlap(queue, buffer)) {
497		err = -ENOMEM;
498		goto out_put;
499	}
500
501	if (!btsq->bts->synth_opts.callchain &&
502	    !btsq->bts->synth_opts.thread_stack && thread &&
503	    (!old_buffer || btsq->bts->sampling_mode ||
504	     (btsq->bts->snapshot_mode && !buffer->consecutive)))
505		thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);
506
507	err = intel_bts_process_buffer(btsq, buffer, thread);
508
509	auxtrace_buffer__drop_data(buffer);
510
511	btsq->buffer = auxtrace_buffer__next(queue, buffer);
512	if (btsq->buffer) {
513		if (timestamp)
514			*timestamp = btsq->buffer->reference;
515	} else {
516		if (!btsq->bts->sampling_mode)
517			btsq->done = 1;
518	}
519out_put:
520	thread__put(thread);
521	return err;
522}
523
524static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
525{
526	u64 ts = 0;
527	int ret;
528
529	while (1) {
530		ret = intel_bts_process_queue(btsq, &ts);
531		if (ret < 0)
532			return ret;
533		if (ret)
534			break;
535	}
536	return 0;
537}
538
539static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
540{
541	struct auxtrace_queues *queues = &bts->queues;
542	unsigned int i;
543
544	for (i = 0; i < queues->nr_queues; i++) {
545		struct auxtrace_queue *queue = &bts->queues.queue_array[i];
546		struct intel_bts_queue *btsq = queue->priv;
547
548		if (btsq && btsq->tid == tid)
549			return intel_bts_flush_queue(btsq);
550	}
551	return 0;
552}
553
554static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
555{
556	while (1) {
557		unsigned int queue_nr;
558		struct auxtrace_queue *queue;
559		struct intel_bts_queue *btsq;
560		u64 ts = 0;
561		int ret;
562
563		if (!bts->heap.heap_cnt)
564			return 0;
565
566		if (bts->heap.heap_array[0].ordinal > timestamp)
567			return 0;
568
569		queue_nr = bts->heap.heap_array[0].queue_nr;
570		queue = &bts->queues.queue_array[queue_nr];
571		btsq = queue->priv;
572
573		auxtrace_heap__pop(&bts->heap);
574
575		ret = intel_bts_process_queue(btsq, &ts);
576		if (ret < 0) {
577			auxtrace_heap__add(&bts->heap, queue_nr, ts);
578			return ret;
579		}
580
581		if (!ret) {
582			ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
583			if (ret < 0)
584				return ret;
585		} else {
586			btsq->on_heap = false;
587		}
588	}
589
590	return 0;
591}
592
593static int intel_bts_process_event(struct perf_session *session,
594				   union perf_event *event,
595				   struct perf_sample *sample,
596				   const struct perf_tool *tool)
597{
598	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
599					     auxtrace);
600	u64 timestamp;
601	int err;
602
603	if (dump_trace)
604		return 0;
605
606	if (!tool->ordered_events) {
607		pr_err("Intel BTS requires ordered events\n");
608		return -EINVAL;
609	}
610
611	if (sample->time && sample->time != (u64)-1)
612		timestamp = perf_time_to_tsc(sample->time, &bts->tc);
613	else
614		timestamp = 0;
615
616	err = intel_bts_update_queues(bts);
617	if (err)
618		return err;
619
620	err = intel_bts_process_queues(bts, timestamp);
621	if (err)
622		return err;
623	if (event->header.type == PERF_RECORD_EXIT) {
624		err = intel_bts_process_tid_exit(bts, event->fork.tid);
625		if (err)
626			return err;
627	}
628
629	if (event->header.type == PERF_RECORD_AUX &&
630	    (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
631	    bts->synth_opts.errors)
632		err = intel_bts_lost(bts, sample);
633
634	return err;
635}
636
637static int intel_bts_process_auxtrace_event(struct perf_session *session,
638					    union perf_event *event,
639					    const struct perf_tool *tool __maybe_unused)
640{
641	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
642					     auxtrace);
643
644	if (bts->sampling_mode)
645		return 0;
646
647	if (!bts->data_queued) {
648		struct auxtrace_buffer *buffer;
649		off_t data_offset;
650		int fd = perf_data__fd(session->data);
651		int err;
652
653		if (perf_data__is_pipe(session->data)) {
654			data_offset = 0;
655		} else {
656			data_offset = lseek(fd, 0, SEEK_CUR);
657			if (data_offset == -1)
658				return -errno;
659		}
660
661		err = auxtrace_queues__add_event(&bts->queues, session, event,
662						 data_offset, &buffer);
663		if (err)
664			return err;
665
666		/* Dump here now we have copied a piped trace out of the pipe */
667		if (dump_trace) {
668			if (auxtrace_buffer__get_data(buffer, fd)) {
669				intel_bts_dump_event(bts, buffer->data,
670						     buffer->size);
671				auxtrace_buffer__put_data(buffer);
672			}
673		}
674	}
675
676	return 0;
677}
678
679static int intel_bts_flush(struct perf_session *session,
680			   const struct perf_tool *tool __maybe_unused)
681{
682	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
683					     auxtrace);
684	int ret;
685
686	if (dump_trace || bts->sampling_mode)
687		return 0;
688
689	if (!tool->ordered_events)
690		return -EINVAL;
691
692	ret = intel_bts_update_queues(bts);
693	if (ret < 0)
694		return ret;
695
696	return intel_bts_process_queues(bts, MAX_TIMESTAMP);
697}
698
699static void intel_bts_free_queue(void *priv)
700{
701	struct intel_bts_queue *btsq = priv;
702
703	if (!btsq)
704		return;
705	free(btsq);
706}
707
708static void intel_bts_free_events(struct perf_session *session)
709{
710	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
711					     auxtrace);
712	struct auxtrace_queues *queues = &bts->queues;
713	unsigned int i;
714
715	for (i = 0; i < queues->nr_queues; i++) {
716		intel_bts_free_queue(queues->queue_array[i].priv);
717		queues->queue_array[i].priv = NULL;
718	}
719	auxtrace_queues__free(queues);
720}
721
722static void intel_bts_free(struct perf_session *session)
723{
724	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
725					     auxtrace);
726
727	auxtrace_heap__free(&bts->heap);
728	intel_bts_free_events(session);
729	session->auxtrace = NULL;
730	free(bts);
731}
732
733static bool intel_bts_evsel_is_auxtrace(struct perf_session *session,
734					struct evsel *evsel)
735{
736	struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
737					     auxtrace);
738
739	return evsel->core.attr.type == bts->pmu_type;
740}
741
742static int intel_bts_synth_events(struct intel_bts *bts,
743				  struct perf_session *session)
744{
745	struct evlist *evlist = session->evlist;
746	struct evsel *evsel;
747	struct perf_event_attr attr;
748	bool found = false;
749	u64 id;
750	int err;
751
752	evlist__for_each_entry(evlist, evsel) {
753		if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
754			found = true;
755			break;
756		}
757	}
758
759	if (!found) {
760		pr_debug("There are no selected events with Intel BTS data\n");
761		return 0;
762	}
763
764	memset(&attr, 0, sizeof(struct perf_event_attr));
765	attr.size = sizeof(struct perf_event_attr);
766	attr.type = PERF_TYPE_HARDWARE;
767	attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
768	attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
769			    PERF_SAMPLE_PERIOD;
770	attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
771	attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
772	attr.exclude_user = evsel->core.attr.exclude_user;
773	attr.exclude_kernel = evsel->core.attr.exclude_kernel;
774	attr.exclude_hv = evsel->core.attr.exclude_hv;
775	attr.exclude_host = evsel->core.attr.exclude_host;
776	attr.exclude_guest = evsel->core.attr.exclude_guest;
777	attr.sample_id_all = evsel->core.attr.sample_id_all;
778	attr.read_format = evsel->core.attr.read_format;
779
780	id = auxtrace_synth_id_range_start(evsel);
781
782	if (bts->synth_opts.branches) {
783		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
784		attr.sample_period = 1;
785		attr.sample_type |= PERF_SAMPLE_ADDR;
786		pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
787			 id, (u64)attr.sample_type);
788		err = perf_session__deliver_synth_attr_event(session, &attr, id);
789		if (err) {
790			pr_err("%s: failed to synthesize 'branches' event type\n",
791			       __func__);
792			return err;
793		}
794		bts->sample_branches = true;
795		bts->branches_sample_type = attr.sample_type;
796		bts->branches_id = id;
797		/*
798		 * We only use sample types from PERF_SAMPLE_MASK so we can use
799		 * __evsel__sample_size() here.
800		 */
801		bts->branches_event_size = sizeof(struct perf_record_sample) +
802					   __evsel__sample_size(attr.sample_type);
803	}
804
805	return 0;
806}
807
808static const char * const intel_bts_info_fmts[] = {
809	[INTEL_BTS_PMU_TYPE]		= "  PMU Type           %"PRId64"\n",
810	[INTEL_BTS_TIME_SHIFT]		= "  Time Shift         %"PRIu64"\n",
811	[INTEL_BTS_TIME_MULT]		= "  Time Multiplier    %"PRIu64"\n",
812	[INTEL_BTS_TIME_ZERO]		= "  Time Zero          %"PRIu64"\n",
813	[INTEL_BTS_CAP_USER_TIME_ZERO]	= "  Cap Time Zero      %"PRId64"\n",
814	[INTEL_BTS_SNAPSHOT_MODE]	= "  Snapshot mode      %"PRId64"\n",
815};
816
817static void intel_bts_print_info(__u64 *arr, int start, int finish)
818{
819	int i;
820
821	if (!dump_trace)
822		return;
823
824	for (i = start; i <= finish; i++)
825		fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
826}
827
828int intel_bts_process_auxtrace_info(union perf_event *event,
829				    struct perf_session *session)
830{
831	struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
832	size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
833	struct intel_bts *bts;
834	int err;
835
836	if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
837					min_sz)
838		return -EINVAL;
839
840	bts = zalloc(sizeof(struct intel_bts));
841	if (!bts)
842		return -ENOMEM;
843
844	err = auxtrace_queues__init(&bts->queues);
845	if (err)
846		goto err_free;
847
848	bts->session = session;
849	bts->machine = &session->machines.host; /* No kvm support */
850	bts->auxtrace_type = auxtrace_info->type;
851	bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
852	bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
853	bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
854	bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
855	bts->cap_user_time_zero =
856			auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
857	bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
858
859	bts->sampling_mode = false;
860
861	bts->auxtrace.process_event = intel_bts_process_event;
862	bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
863	bts->auxtrace.flush_events = intel_bts_flush;
864	bts->auxtrace.free_events = intel_bts_free_events;
865	bts->auxtrace.free = intel_bts_free;
866	bts->auxtrace.evsel_is_auxtrace = intel_bts_evsel_is_auxtrace;
867	session->auxtrace = &bts->auxtrace;
868
869	intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
870			     INTEL_BTS_SNAPSHOT_MODE);
871
872	if (dump_trace)
873		return 0;
874
875	if (session->itrace_synth_opts->set) {
876		bts->synth_opts = *session->itrace_synth_opts;
877	} else {
878		itrace_synth_opts__set_default(&bts->synth_opts,
879				session->itrace_synth_opts->default_no_sample);
880		bts->synth_opts.thread_stack =
881				session->itrace_synth_opts->thread_stack;
882	}
883
884	if (bts->synth_opts.calls)
885		bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
886					PERF_IP_FLAG_TRACE_END;
887	if (bts->synth_opts.returns)
888		bts->branches_filter |= PERF_IP_FLAG_RETURN |
889					PERF_IP_FLAG_TRACE_BEGIN;
890
891	err = intel_bts_synth_events(bts, session);
892	if (err)
893		goto err_free_queues;
894
895	err = auxtrace_queues__process_index(&bts->queues, session);
896	if (err)
897		goto err_free_queues;
898
899	if (bts->queues.populated)
900		bts->data_queued = true;
901
902	return 0;
903
904err_free_queues:
905	auxtrace_queues__free(&bts->queues);
906	session->auxtrace = NULL;
907err_free:
908	free(bts);
909	return err;
910}