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16#include <stdbool.h>
17#include <linux/kernel.h>
18#include <linux/types.h>
19#include <linux/bitops.h>
20#include <linux/log2.h>
21#include <cpuid.h>
22
23#include "../../perf.h"
24#include "../../util/session.h"
25#include "../../util/event.h"
26#include "../../util/evlist.h"
27#include "../../util/evsel.h"
28#include "../../util/cpumap.h"
29#include <subcmd/parse-options.h>
30#include "../../util/parse-events.h"
31#include "../../util/pmu.h"
32#include "../../util/debug.h"
33#include "../../util/auxtrace.h"
34#include "../../util/tsc.h"
35#include "../../util/intel-pt.h"
36
37#define KiB(x) ((x) * 1024)
38#define MiB(x) ((x) * 1024 * 1024)
39#define KiB_MASK(x) (KiB(x) - 1)
40#define MiB_MASK(x) (MiB(x) - 1)
41
42#define INTEL_PT_DEFAULT_SAMPLE_SIZE KiB(4)
43
44#define INTEL_PT_MAX_SAMPLE_SIZE KiB(60)
45
46#define INTEL_PT_PSB_PERIOD_NEAR 256
47
48struct intel_pt_snapshot_ref {
49 void *ref_buf;
50 size_t ref_offset;
51 bool wrapped;
52};
53
54struct intel_pt_recording {
55 struct auxtrace_record itr;
56 struct perf_pmu *intel_pt_pmu;
57 int have_sched_switch;
58 struct perf_evlist *evlist;
59 bool snapshot_mode;
60 bool snapshot_init_done;
61 size_t snapshot_size;
62 size_t snapshot_ref_buf_size;
63 int snapshot_ref_cnt;
64 struct intel_pt_snapshot_ref *snapshot_refs;
65};
66
67static int intel_pt_parse_terms_with_default(struct list_head *formats,
68 const char *str,
69 u64 *config)
70{
71 struct list_head *terms;
72 struct perf_event_attr attr = { .size = 0, };
73 int err;
74
75 terms = malloc(sizeof(struct list_head));
76 if (!terms)
77 return -ENOMEM;
78
79 INIT_LIST_HEAD(terms);
80
81 err = parse_events_terms(terms, str);
82 if (err)
83 goto out_free;
84
85 attr.config = *config;
86 err = perf_pmu__config_terms(formats, &attr, terms, true, NULL);
87 if (err)
88 goto out_free;
89
90 *config = attr.config;
91out_free:
92 parse_events_terms__delete(terms);
93 return err;
94}
95
96static int intel_pt_parse_terms(struct list_head *formats, const char *str,
97 u64 *config)
98{
99 *config = 0;
100 return intel_pt_parse_terms_with_default(formats, str, config);
101}
102
103static u64 intel_pt_masked_bits(u64 mask, u64 bits)
104{
105 const u64 top_bit = 1ULL << 63;
106 u64 res = 0;
107 int i;
108
109 for (i = 0; i < 64; i++) {
110 if (mask & top_bit) {
111 res <<= 1;
112 if (bits & top_bit)
113 res |= 1;
114 }
115 mask <<= 1;
116 bits <<= 1;
117 }
118
119 return res;
120}
121
122static int intel_pt_read_config(struct perf_pmu *intel_pt_pmu, const char *str,
123 struct perf_evlist *evlist, u64 *res)
124{
125 struct perf_evsel *evsel;
126 u64 mask;
127
128 *res = 0;
129
130 mask = perf_pmu__format_bits(&intel_pt_pmu->format, str);
131 if (!mask)
132 return -EINVAL;
133
134 evlist__for_each(evlist, evsel) {
135 if (evsel->attr.type == intel_pt_pmu->type) {
136 *res = intel_pt_masked_bits(mask, evsel->attr.config);
137 return 0;
138 }
139 }
140
141 return -EINVAL;
142}
143
144static size_t intel_pt_psb_period(struct perf_pmu *intel_pt_pmu,
145 struct perf_evlist *evlist)
146{
147 u64 val;
148 int err, topa_multiple_entries;
149 size_t psb_period;
150
151 if (perf_pmu__scan_file(intel_pt_pmu, "caps/topa_multiple_entries",
152 "%d", &topa_multiple_entries) != 1)
153 topa_multiple_entries = 0;
154
155
156
157
158
159 if (!topa_multiple_entries) {
160 psb_period = 256;
161 goto out;
162 }
163
164 err = intel_pt_read_config(intel_pt_pmu, "psb_period", evlist, &val);
165 if (err)
166 val = 0;
167
168 psb_period = 1 << (val + 11);
169out:
170 pr_debug2("%s psb_period %zu\n", intel_pt_pmu->name, psb_period);
171 return psb_period;
172}
173
174static int intel_pt_pick_bit(int bits, int target)
175{
176 int pos, pick = -1;
177
178 for (pos = 0; bits; bits >>= 1, pos++) {
179 if (bits & 1) {
180 if (pos <= target || pick < 0)
181 pick = pos;
182 if (pos >= target)
183 break;
184 }
185 }
186
187 return pick;
188}
189
190static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
191{
192 char buf[256];
193 int mtc, mtc_periods = 0, mtc_period;
194 int psb_cyc, psb_periods, psb_period;
195 int pos = 0;
196 u64 config;
197
198 pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc");
199
200 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc", "%d",
201 &mtc) != 1)
202 mtc = 1;
203
204 if (mtc) {
205 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc_periods", "%x",
206 &mtc_periods) != 1)
207 mtc_periods = 0;
208 if (mtc_periods) {
209 mtc_period = intel_pt_pick_bit(mtc_periods, 3);
210 pos += scnprintf(buf + pos, sizeof(buf) - pos,
211 ",mtc,mtc_period=%d", mtc_period);
212 }
213 }
214
215 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_cyc", "%d",
216 &psb_cyc) != 1)
217 psb_cyc = 1;
218
219 if (psb_cyc && mtc_periods) {
220 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_periods", "%x",
221 &psb_periods) != 1)
222 psb_periods = 0;
223 if (psb_periods) {
224 psb_period = intel_pt_pick_bit(psb_periods, 3);
225 pos += scnprintf(buf + pos, sizeof(buf) - pos,
226 ",psb_period=%d", psb_period);
227 }
228 }
229
230 pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);
231
232 intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config);
233
234 return config;
235}
236
237static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr,
238 struct record_opts *opts,
239 const char *str)
240{
241 struct intel_pt_recording *ptr =
242 container_of(itr, struct intel_pt_recording, itr);
243 unsigned long long snapshot_size = 0;
244 char *endptr;
245
246 if (str) {
247 snapshot_size = strtoull(str, &endptr, 0);
248 if (*endptr || snapshot_size > SIZE_MAX)
249 return -1;
250 }
251
252 opts->auxtrace_snapshot_mode = true;
253 opts->auxtrace_snapshot_size = snapshot_size;
254
255 ptr->snapshot_size = snapshot_size;
256
257 return 0;
258}
259
260struct perf_event_attr *
261intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
262{
263 struct perf_event_attr *attr;
264
265 attr = zalloc(sizeof(struct perf_event_attr));
266 if (!attr)
267 return NULL;
268
269 attr->config = intel_pt_default_config(intel_pt_pmu);
270
271 intel_pt_pmu->selectable = true;
272
273 return attr;
274}
275
276static size_t
277intel_pt_info_priv_size(struct auxtrace_record *itr __maybe_unused,
278 struct perf_evlist *evlist __maybe_unused)
279{
280 return INTEL_PT_AUXTRACE_PRIV_SIZE;
281}
282
283static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
284{
285 unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
286
287 __get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
288 *n = ebx;
289 *d = eax;
290}
291
292static int intel_pt_info_fill(struct auxtrace_record *itr,
293 struct perf_session *session,
294 struct auxtrace_info_event *auxtrace_info,
295 size_t priv_size)
296{
297 struct intel_pt_recording *ptr =
298 container_of(itr, struct intel_pt_recording, itr);
299 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
300 struct perf_event_mmap_page *pc;
301 struct perf_tsc_conversion tc = { .time_mult = 0, };
302 bool cap_user_time_zero = false, per_cpu_mmaps;
303 u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
304 u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
305 int err;
306
307 if (priv_size != INTEL_PT_AUXTRACE_PRIV_SIZE)
308 return -EINVAL;
309
310 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
311 intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
312 &noretcomp_bit);
313 intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit);
314 mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
315 "mtc_period");
316 intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit);
317
318 intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
319
320 if (!session->evlist->nr_mmaps)
321 return -EINVAL;
322
323 pc = session->evlist->mmap[0].base;
324 if (pc) {
325 err = perf_read_tsc_conversion(pc, &tc);
326 if (err) {
327 if (err != -EOPNOTSUPP)
328 return err;
329 } else {
330 cap_user_time_zero = tc.time_mult != 0;
331 }
332 if (!cap_user_time_zero)
333 ui__warning("Intel Processor Trace: TSC not available\n");
334 }
335
336 per_cpu_mmaps = !cpu_map__empty(session->evlist->cpus);
337
338 auxtrace_info->type = PERF_AUXTRACE_INTEL_PT;
339 auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type;
340 auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift;
341 auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult;
342 auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero;
343 auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero;
344 auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit;
345 auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit;
346 auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch;
347 auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode;
348 auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps;
349 auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit;
350 auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits;
351 auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n;
352 auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
353 auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
354
355 return 0;
356}
357
358static int intel_pt_track_switches(struct perf_evlist *evlist)
359{
360 const char *sched_switch = "sched:sched_switch";
361 struct perf_evsel *evsel;
362 int err;
363
364 if (!perf_evlist__can_select_event(evlist, sched_switch))
365 return -EPERM;
366
367 err = parse_events(evlist, sched_switch, NULL);
368 if (err) {
369 pr_debug2("%s: failed to parse %s, error %d\n",
370 __func__, sched_switch, err);
371 return err;
372 }
373
374 evsel = perf_evlist__last(evlist);
375
376 perf_evsel__set_sample_bit(evsel, CPU);
377 perf_evsel__set_sample_bit(evsel, TIME);
378
379 evsel->system_wide = true;
380 evsel->no_aux_samples = true;
381 evsel->immediate = true;
382
383 return 0;
384}
385
386static void intel_pt_valid_str(char *str, size_t len, u64 valid)
387{
388 unsigned int val, last = 0, state = 1;
389 int p = 0;
390
391 str[0] = '\0';
392
393 for (val = 0; val <= 64; val++, valid >>= 1) {
394 if (valid & 1) {
395 last = val;
396 switch (state) {
397 case 0:
398 p += scnprintf(str + p, len - p, ",");
399
400 case 1:
401 p += scnprintf(str + p, len - p, "%u", val);
402 state = 2;
403 break;
404 case 2:
405 state = 3;
406 break;
407 case 3:
408 state = 4;
409 break;
410 default:
411 break;
412 }
413 } else {
414 switch (state) {
415 case 3:
416 p += scnprintf(str + p, len - p, ",%u", last);
417 state = 0;
418 break;
419 case 4:
420 p += scnprintf(str + p, len - p, "-%u", last);
421 state = 0;
422 break;
423 default:
424 break;
425 }
426 if (state != 1)
427 state = 0;
428 }
429 }
430}
431
432static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
433 const char *caps, const char *name,
434 const char *supported, u64 config)
435{
436 char valid_str[256];
437 unsigned int shift;
438 unsigned long long valid;
439 u64 bits;
440 int ok;
441
442 if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1)
443 valid = 0;
444
445 if (supported &&
446 perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok)
447 valid = 0;
448
449 valid |= 1;
450
451 bits = perf_pmu__format_bits(&intel_pt_pmu->format, name);
452
453 config &= bits;
454
455 for (shift = 0; bits && !(bits & 1); shift++)
456 bits >>= 1;
457
458 config >>= shift;
459
460 if (config > 63)
461 goto out_err;
462
463 if (valid & (1 << config))
464 return 0;
465out_err:
466 intel_pt_valid_str(valid_str, sizeof(valid_str), valid);
467 pr_err("Invalid %s for %s. Valid values are: %s\n",
468 name, INTEL_PT_PMU_NAME, valid_str);
469 return -EINVAL;
470}
471
472static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
473 struct perf_evsel *evsel)
474{
475 int err;
476
477 if (!evsel)
478 return 0;
479
480 err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
481 "cyc_thresh", "caps/psb_cyc",
482 evsel->attr.config);
483 if (err)
484 return err;
485
486 err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods",
487 "mtc_period", "caps/mtc",
488 evsel->attr.config);
489 if (err)
490 return err;
491
492 return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods",
493 "psb_period", "caps/psb_cyc",
494 evsel->attr.config);
495}
496
497static int intel_pt_recording_options(struct auxtrace_record *itr,
498 struct perf_evlist *evlist,
499 struct record_opts *opts)
500{
501 struct intel_pt_recording *ptr =
502 container_of(itr, struct intel_pt_recording, itr);
503 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
504 bool have_timing_info;
505 struct perf_evsel *evsel, *intel_pt_evsel = NULL;
506 const struct cpu_map *cpus = evlist->cpus;
507 bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
508 u64 tsc_bit;
509 int err;
510
511 ptr->evlist = evlist;
512 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
513
514 evlist__for_each(evlist, evsel) {
515 if (evsel->attr.type == intel_pt_pmu->type) {
516 if (intel_pt_evsel) {
517 pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n");
518 return -EINVAL;
519 }
520 evsel->attr.freq = 0;
521 evsel->attr.sample_period = 1;
522 intel_pt_evsel = evsel;
523 opts->full_auxtrace = true;
524 }
525 }
526
527 if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
528 pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n");
529 return -EINVAL;
530 }
531
532 if (opts->use_clockid) {
533 pr_err("Cannot use clockid (-k option) with " INTEL_PT_PMU_NAME "\n");
534 return -EINVAL;
535 }
536
537 if (!opts->full_auxtrace)
538 return 0;
539
540 err = intel_pt_validate_config(intel_pt_pmu, intel_pt_evsel);
541 if (err)
542 return err;
543
544
545 if (opts->auxtrace_snapshot_mode) {
546 size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
547
548 if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
549 if (privileged) {
550 opts->auxtrace_mmap_pages = MiB(4) / page_size;
551 } else {
552 opts->auxtrace_mmap_pages = KiB(128) / page_size;
553 if (opts->mmap_pages == UINT_MAX)
554 opts->mmap_pages = KiB(256) / page_size;
555 }
556 } else if (!opts->auxtrace_mmap_pages && !privileged &&
557 opts->mmap_pages == UINT_MAX) {
558 opts->mmap_pages = KiB(256) / page_size;
559 }
560 if (!opts->auxtrace_snapshot_size)
561 opts->auxtrace_snapshot_size =
562 opts->auxtrace_mmap_pages * (size_t)page_size;
563 if (!opts->auxtrace_mmap_pages) {
564 size_t sz = opts->auxtrace_snapshot_size;
565
566 sz = round_up(sz, page_size) / page_size;
567 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
568 }
569 if (opts->auxtrace_snapshot_size >
570 opts->auxtrace_mmap_pages * (size_t)page_size) {
571 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
572 opts->auxtrace_snapshot_size,
573 opts->auxtrace_mmap_pages * (size_t)page_size);
574 return -EINVAL;
575 }
576 if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
577 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
578 return -EINVAL;
579 }
580 pr_debug2("Intel PT snapshot size: %zu\n",
581 opts->auxtrace_snapshot_size);
582 if (psb_period &&
583 opts->auxtrace_snapshot_size <= psb_period +
584 INTEL_PT_PSB_PERIOD_NEAR)
585 ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n",
586 opts->auxtrace_snapshot_size, psb_period);
587 }
588
589
590 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
591 if (privileged) {
592 opts->auxtrace_mmap_pages = MiB(4) / page_size;
593 } else {
594 opts->auxtrace_mmap_pages = KiB(128) / page_size;
595 if (opts->mmap_pages == UINT_MAX)
596 opts->mmap_pages = KiB(256) / page_size;
597 }
598 }
599
600
601 if (opts->auxtrace_mmap_pages) {
602 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
603 size_t min_sz;
604
605 if (opts->auxtrace_snapshot_mode)
606 min_sz = KiB(4);
607 else
608 min_sz = KiB(8);
609
610 if (sz < min_sz || !is_power_of_2(sz)) {
611 pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n",
612 min_sz / 1024);
613 return -EINVAL;
614 }
615 }
616
617 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
618
619 if (opts->full_auxtrace && (intel_pt_evsel->attr.config & tsc_bit))
620 have_timing_info = true;
621 else
622 have_timing_info = false;
623
624
625
626
627
628 if (have_timing_info && !cpu_map__empty(cpus)) {
629 if (perf_can_record_switch_events()) {
630 bool cpu_wide = !target__none(&opts->target) &&
631 !target__has_task(&opts->target);
632
633 if (!cpu_wide && perf_can_record_cpu_wide()) {
634 struct perf_evsel *switch_evsel;
635
636 err = parse_events(evlist, "dummy:u", NULL);
637 if (err)
638 return err;
639
640 switch_evsel = perf_evlist__last(evlist);
641
642 switch_evsel->attr.freq = 0;
643 switch_evsel->attr.sample_period = 1;
644 switch_evsel->attr.context_switch = 1;
645
646 switch_evsel->system_wide = true;
647 switch_evsel->no_aux_samples = true;
648 switch_evsel->immediate = true;
649
650 perf_evsel__set_sample_bit(switch_evsel, TID);
651 perf_evsel__set_sample_bit(switch_evsel, TIME);
652 perf_evsel__set_sample_bit(switch_evsel, CPU);
653
654 opts->record_switch_events = false;
655 ptr->have_sched_switch = 3;
656 } else {
657 opts->record_switch_events = true;
658 if (cpu_wide)
659 ptr->have_sched_switch = 3;
660 else
661 ptr->have_sched_switch = 2;
662 }
663 } else {
664 err = intel_pt_track_switches(evlist);
665 if (err == -EPERM)
666 pr_debug2("Unable to select sched:sched_switch\n");
667 else if (err)
668 return err;
669 else
670 ptr->have_sched_switch = 1;
671 }
672 }
673
674 if (intel_pt_evsel) {
675
676
677
678
679 perf_evlist__to_front(evlist, intel_pt_evsel);
680
681
682
683
684 if (!cpu_map__empty(cpus))
685 perf_evsel__set_sample_bit(intel_pt_evsel, CPU);
686 }
687
688
689 if (opts->full_auxtrace) {
690 struct perf_evsel *tracking_evsel;
691
692 err = parse_events(evlist, "dummy:u", NULL);
693 if (err)
694 return err;
695
696 tracking_evsel = perf_evlist__last(evlist);
697
698 perf_evlist__set_tracking_event(evlist, tracking_evsel);
699
700 tracking_evsel->attr.freq = 0;
701 tracking_evsel->attr.sample_period = 1;
702
703
704 if (!cpu_map__empty(cpus)) {
705 perf_evsel__set_sample_bit(tracking_evsel, TIME);
706
707 perf_evsel__set_sample_bit(tracking_evsel, CPU);
708 }
709 }
710
711
712
713
714
715 if (!ptr->have_sched_switch && !cpu_map__empty(cpus) &&
716 !target__none(&opts->target))
717 ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n");
718
719 return 0;
720}
721
722static int intel_pt_snapshot_start(struct auxtrace_record *itr)
723{
724 struct intel_pt_recording *ptr =
725 container_of(itr, struct intel_pt_recording, itr);
726 struct perf_evsel *evsel;
727
728 evlist__for_each(ptr->evlist, evsel) {
729 if (evsel->attr.type == ptr->intel_pt_pmu->type)
730 return perf_evsel__disable(evsel);
731 }
732 return -EINVAL;
733}
734
735static int intel_pt_snapshot_finish(struct auxtrace_record *itr)
736{
737 struct intel_pt_recording *ptr =
738 container_of(itr, struct intel_pt_recording, itr);
739 struct perf_evsel *evsel;
740
741 evlist__for_each(ptr->evlist, evsel) {
742 if (evsel->attr.type == ptr->intel_pt_pmu->type)
743 return perf_evsel__enable(evsel);
744 }
745 return -EINVAL;
746}
747
748static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx)
749{
750 const size_t sz = sizeof(struct intel_pt_snapshot_ref);
751 int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2;
752 struct intel_pt_snapshot_ref *refs;
753
754 if (!new_cnt)
755 new_cnt = 16;
756
757 while (new_cnt <= idx)
758 new_cnt *= 2;
759
760 refs = calloc(new_cnt, sz);
761 if (!refs)
762 return -ENOMEM;
763
764 memcpy(refs, ptr->snapshot_refs, cnt * sz);
765
766 ptr->snapshot_refs = refs;
767 ptr->snapshot_ref_cnt = new_cnt;
768
769 return 0;
770}
771
772static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr)
773{
774 int i;
775
776 for (i = 0; i < ptr->snapshot_ref_cnt; i++)
777 zfree(&ptr->snapshot_refs[i].ref_buf);
778 zfree(&ptr->snapshot_refs);
779}
780
781static void intel_pt_recording_free(struct auxtrace_record *itr)
782{
783 struct intel_pt_recording *ptr =
784 container_of(itr, struct intel_pt_recording, itr);
785
786 intel_pt_free_snapshot_refs(ptr);
787 free(ptr);
788}
789
790static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx,
791 size_t snapshot_buf_size)
792{
793 size_t ref_buf_size = ptr->snapshot_ref_buf_size;
794 void *ref_buf;
795
796 ref_buf = zalloc(ref_buf_size);
797 if (!ref_buf)
798 return -ENOMEM;
799
800 ptr->snapshot_refs[idx].ref_buf = ref_buf;
801 ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size;
802
803 return 0;
804}
805
806static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr,
807 size_t snapshot_buf_size)
808{
809 const size_t max_size = 256 * 1024;
810 size_t buf_size = 0, psb_period;
811
812 if (ptr->snapshot_size <= 64 * 1024)
813 return 0;
814
815 psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist);
816 if (psb_period)
817 buf_size = psb_period * 2;
818
819 if (!buf_size || buf_size > max_size)
820 buf_size = max_size;
821
822 if (buf_size >= snapshot_buf_size)
823 return 0;
824
825 if (buf_size >= ptr->snapshot_size / 2)
826 return 0;
827
828 return buf_size;
829}
830
831static int intel_pt_snapshot_init(struct intel_pt_recording *ptr,
832 size_t snapshot_buf_size)
833{
834 if (ptr->snapshot_init_done)
835 return 0;
836
837 ptr->snapshot_init_done = true;
838
839 ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr,
840 snapshot_buf_size);
841
842 return 0;
843}
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858static bool intel_pt_compare_buffers(void *buf1, size_t compare_size,
859 void *buf2, size_t offs2, size_t buf2_size)
860{
861 size_t end2 = offs2 + compare_size, part_size;
862
863 if (end2 <= buf2_size)
864 return memcmp(buf1, buf2 + offs2, compare_size);
865
866 part_size = end2 - buf2_size;
867 if (memcmp(buf1, buf2 + offs2, part_size))
868 return true;
869
870 compare_size -= part_size;
871
872 return memcmp(buf1 + part_size, buf2, compare_size);
873}
874
875static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset,
876 size_t ref_size, size_t buf_size,
877 void *data, size_t head)
878{
879 size_t ref_end = ref_offset + ref_size;
880
881 if (ref_end > buf_size) {
882 if (head > ref_offset || head < ref_end - buf_size)
883 return true;
884 } else if (head > ref_offset && head < ref_end) {
885 return true;
886 }
887
888 return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset,
889 buf_size);
890}
891
892static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size,
893 void *data, size_t head)
894{
895 if (head >= ref_size) {
896 memcpy(ref_buf, data + head - ref_size, ref_size);
897 } else {
898 memcpy(ref_buf, data, head);
899 ref_size -= head;
900 memcpy(ref_buf + head, data + buf_size - ref_size, ref_size);
901 }
902}
903
904static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx,
905 struct auxtrace_mmap *mm, unsigned char *data,
906 u64 head)
907{
908 struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx];
909 bool wrapped;
910
911 wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset,
912 ptr->snapshot_ref_buf_size, mm->len,
913 data, head);
914
915 intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len,
916 data, head);
917
918 return wrapped;
919}
920
921static bool intel_pt_first_wrap(u64 *data, size_t buf_size)
922{
923 int i, a, b;
924
925 b = buf_size >> 3;
926 a = b - 512;
927 if (a < 0)
928 a = 0;
929
930 for (i = a; i < b; i++) {
931 if (data[i])
932 return true;
933 }
934
935 return false;
936}
937
938static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx,
939 struct auxtrace_mmap *mm, unsigned char *data,
940 u64 *head, u64 *old)
941{
942 struct intel_pt_recording *ptr =
943 container_of(itr, struct intel_pt_recording, itr);
944 bool wrapped;
945 int err;
946
947 pr_debug3("%s: mmap index %d old head %zu new head %zu\n",
948 __func__, idx, (size_t)*old, (size_t)*head);
949
950 err = intel_pt_snapshot_init(ptr, mm->len);
951 if (err)
952 goto out_err;
953
954 if (idx >= ptr->snapshot_ref_cnt) {
955 err = intel_pt_alloc_snapshot_refs(ptr, idx);
956 if (err)
957 goto out_err;
958 }
959
960 if (ptr->snapshot_ref_buf_size) {
961 if (!ptr->snapshot_refs[idx].ref_buf) {
962 err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len);
963 if (err)
964 goto out_err;
965 }
966 wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head);
967 } else {
968 wrapped = ptr->snapshot_refs[idx].wrapped;
969 if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) {
970 ptr->snapshot_refs[idx].wrapped = true;
971 wrapped = true;
972 }
973 }
974
975
976
977
978
979
980
981 if (wrapped) {
982 *old = *head;
983 *head += mm->len;
984 } else {
985 if (mm->mask)
986 *old &= mm->mask;
987 else
988 *old %= mm->len;
989 if (*old > *head)
990 *head += mm->len;
991 }
992
993 pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n",
994 __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head);
995
996 return 0;
997
998out_err:
999 pr_err("%s: failed, error %d\n", __func__, err);
1000 return err;
1001}
1002
1003static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused)
1004{
1005 return rdtsc();
1006}
1007
1008static int intel_pt_read_finish(struct auxtrace_record *itr, int idx)
1009{
1010 struct intel_pt_recording *ptr =
1011 container_of(itr, struct intel_pt_recording, itr);
1012 struct perf_evsel *evsel;
1013
1014 evlist__for_each(ptr->evlist, evsel) {
1015 if (evsel->attr.type == ptr->intel_pt_pmu->type)
1016 return perf_evlist__enable_event_idx(ptr->evlist, evsel,
1017 idx);
1018 }
1019 return -EINVAL;
1020}
1021
1022struct auxtrace_record *intel_pt_recording_init(int *err)
1023{
1024 struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
1025 struct intel_pt_recording *ptr;
1026
1027 if (!intel_pt_pmu)
1028 return NULL;
1029
1030 ptr = zalloc(sizeof(struct intel_pt_recording));
1031 if (!ptr) {
1032 *err = -ENOMEM;
1033 return NULL;
1034 }
1035
1036 ptr->intel_pt_pmu = intel_pt_pmu;
1037 ptr->itr.recording_options = intel_pt_recording_options;
1038 ptr->itr.info_priv_size = intel_pt_info_priv_size;
1039 ptr->itr.info_fill = intel_pt_info_fill;
1040 ptr->itr.free = intel_pt_recording_free;
1041 ptr->itr.snapshot_start = intel_pt_snapshot_start;
1042 ptr->itr.snapshot_finish = intel_pt_snapshot_finish;
1043 ptr->itr.find_snapshot = intel_pt_find_snapshot;
1044 ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options;
1045 ptr->itr.reference = intel_pt_reference;
1046 ptr->itr.read_finish = intel_pt_read_finish;
1047 return &ptr->itr;
1048}
1049
