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16#include <errno.h>
17#include <stdbool.h>
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/bitops.h>
21#include <linux/log2.h>
22#include <cpuid.h>
23
24#include "../../perf.h"
25#include "../../util/session.h"
26#include "../../util/event.h"
27#include "../../util/evlist.h"
28#include "../../util/evsel.h"
29#include "../../util/cpumap.h"
30#include <subcmd/parse-options.h>
31#include "../../util/parse-events.h"
32#include "../../util/pmu.h"
33#include "../../util/debug.h"
34#include "../../util/auxtrace.h"
35#include "../../util/tsc.h"
36#include "../../util/intel-pt.h"
37
38#define KiB(x) ((x) * 1024)
39#define MiB(x) ((x) * 1024 * 1024)
40#define KiB_MASK(x) (KiB(x) - 1)
41#define MiB_MASK(x) (MiB(x) - 1)
42
43#define INTEL_PT_DEFAULT_SAMPLE_SIZE KiB(4)
44
45#define INTEL_PT_MAX_SAMPLE_SIZE KiB(60)
46
47#define INTEL_PT_PSB_PERIOD_NEAR 256
48
49struct intel_pt_snapshot_ref {
50 void *ref_buf;
51 size_t ref_offset;
52 bool wrapped;
53};
54
55struct intel_pt_recording {
56 struct auxtrace_record itr;
57 struct perf_pmu *intel_pt_pmu;
58 int have_sched_switch;
59 struct perf_evlist *evlist;
60 bool snapshot_mode;
61 bool snapshot_init_done;
62 size_t snapshot_size;
63 size_t snapshot_ref_buf_size;
64 int snapshot_ref_cnt;
65 struct intel_pt_snapshot_ref *snapshot_refs;
66 size_t priv_size;
67};
68
69static int intel_pt_parse_terms_with_default(struct list_head *formats,
70 const char *str,
71 u64 *config)
72{
73 struct list_head *terms;
74 struct perf_event_attr attr = { .size = 0, };
75 int err;
76
77 terms = malloc(sizeof(struct list_head));
78 if (!terms)
79 return -ENOMEM;
80
81 INIT_LIST_HEAD(terms);
82
83 err = parse_events_terms(terms, str);
84 if (err)
85 goto out_free;
86
87 attr.config = *config;
88 err = perf_pmu__config_terms(formats, &attr, terms, true, NULL);
89 if (err)
90 goto out_free;
91
92 *config = attr.config;
93out_free:
94 parse_events_terms__delete(terms);
95 return err;
96}
97
98static int intel_pt_parse_terms(struct list_head *formats, const char *str,
99 u64 *config)
100{
101 *config = 0;
102 return intel_pt_parse_terms_with_default(formats, str, config);
103}
104
105static u64 intel_pt_masked_bits(u64 mask, u64 bits)
106{
107 const u64 top_bit = 1ULL << 63;
108 u64 res = 0;
109 int i;
110
111 for (i = 0; i < 64; i++) {
112 if (mask & top_bit) {
113 res <<= 1;
114 if (bits & top_bit)
115 res |= 1;
116 }
117 mask <<= 1;
118 bits <<= 1;
119 }
120
121 return res;
122}
123
124static int intel_pt_read_config(struct perf_pmu *intel_pt_pmu, const char *str,
125 struct perf_evlist *evlist, u64 *res)
126{
127 struct perf_evsel *evsel;
128 u64 mask;
129
130 *res = 0;
131
132 mask = perf_pmu__format_bits(&intel_pt_pmu->format, str);
133 if (!mask)
134 return -EINVAL;
135
136 evlist__for_each_entry(evlist, evsel) {
137 if (evsel->attr.type == intel_pt_pmu->type) {
138 *res = intel_pt_masked_bits(mask, evsel->attr.config);
139 return 0;
140 }
141 }
142
143 return -EINVAL;
144}
145
146static size_t intel_pt_psb_period(struct perf_pmu *intel_pt_pmu,
147 struct perf_evlist *evlist)
148{
149 u64 val;
150 int err, topa_multiple_entries;
151 size_t psb_period;
152
153 if (perf_pmu__scan_file(intel_pt_pmu, "caps/topa_multiple_entries",
154 "%d", &topa_multiple_entries) != 1)
155 topa_multiple_entries = 0;
156
157
158
159
160
161 if (!topa_multiple_entries) {
162 psb_period = 256;
163 goto out;
164 }
165
166 err = intel_pt_read_config(intel_pt_pmu, "psb_period", evlist, &val);
167 if (err)
168 val = 0;
169
170 psb_period = 1 << (val + 11);
171out:
172 pr_debug2("%s psb_period %zu\n", intel_pt_pmu->name, psb_period);
173 return psb_period;
174}
175
176static int intel_pt_pick_bit(int bits, int target)
177{
178 int pos, pick = -1;
179
180 for (pos = 0; bits; bits >>= 1, pos++) {
181 if (bits & 1) {
182 if (pos <= target || pick < 0)
183 pick = pos;
184 if (pos >= target)
185 break;
186 }
187 }
188
189 return pick;
190}
191
192static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
193{
194 char buf[256];
195 int mtc, mtc_periods = 0, mtc_period;
196 int psb_cyc, psb_periods, psb_period;
197 int pos = 0;
198 u64 config;
199
200 pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc");
201
202 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc", "%d",
203 &mtc) != 1)
204 mtc = 1;
205
206 if (mtc) {
207 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc_periods", "%x",
208 &mtc_periods) != 1)
209 mtc_periods = 0;
210 if (mtc_periods) {
211 mtc_period = intel_pt_pick_bit(mtc_periods, 3);
212 pos += scnprintf(buf + pos, sizeof(buf) - pos,
213 ",mtc,mtc_period=%d", mtc_period);
214 }
215 }
216
217 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_cyc", "%d",
218 &psb_cyc) != 1)
219 psb_cyc = 1;
220
221 if (psb_cyc && mtc_periods) {
222 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_periods", "%x",
223 &psb_periods) != 1)
224 psb_periods = 0;
225 if (psb_periods) {
226 psb_period = intel_pt_pick_bit(psb_periods, 3);
227 pos += scnprintf(buf + pos, sizeof(buf) - pos,
228 ",psb_period=%d", psb_period);
229 }
230 }
231
232 pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);
233
234 intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config);
235
236 return config;
237}
238
239static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr,
240 struct record_opts *opts,
241 const char *str)
242{
243 struct intel_pt_recording *ptr =
244 container_of(itr, struct intel_pt_recording, itr);
245 unsigned long long snapshot_size = 0;
246 char *endptr;
247
248 if (str) {
249 snapshot_size = strtoull(str, &endptr, 0);
250 if (*endptr || snapshot_size > SIZE_MAX)
251 return -1;
252 }
253
254 opts->auxtrace_snapshot_mode = true;
255 opts->auxtrace_snapshot_size = snapshot_size;
256
257 ptr->snapshot_size = snapshot_size;
258
259 return 0;
260}
261
262struct perf_event_attr *
263intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
264{
265 struct perf_event_attr *attr;
266
267 attr = zalloc(sizeof(struct perf_event_attr));
268 if (!attr)
269 return NULL;
270
271 attr->config = intel_pt_default_config(intel_pt_pmu);
272
273 intel_pt_pmu->selectable = true;
274
275 return attr;
276}
277
278static const char *intel_pt_find_filter(struct perf_evlist *evlist,
279 struct perf_pmu *intel_pt_pmu)
280{
281 struct perf_evsel *evsel;
282
283 evlist__for_each_entry(evlist, evsel) {
284 if (evsel->attr.type == intel_pt_pmu->type)
285 return evsel->filter;
286 }
287
288 return NULL;
289}
290
291static size_t intel_pt_filter_bytes(const char *filter)
292{
293 size_t len = filter ? strlen(filter) : 0;
294
295 return len ? roundup(len + 1, 8) : 0;
296}
297
298static size_t
299intel_pt_info_priv_size(struct auxtrace_record *itr, struct perf_evlist *evlist)
300{
301 struct intel_pt_recording *ptr =
302 container_of(itr, struct intel_pt_recording, itr);
303 const char *filter = intel_pt_find_filter(evlist, ptr->intel_pt_pmu);
304
305 ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
306 intel_pt_filter_bytes(filter);
307
308 return ptr->priv_size;
309}
310
311static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
312{
313 unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
314
315 __get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
316 *n = ebx;
317 *d = eax;
318}
319
320static int intel_pt_info_fill(struct auxtrace_record *itr,
321 struct perf_session *session,
322 struct auxtrace_info_event *auxtrace_info,
323 size_t priv_size)
324{
325 struct intel_pt_recording *ptr =
326 container_of(itr, struct intel_pt_recording, itr);
327 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
328 struct perf_event_mmap_page *pc;
329 struct perf_tsc_conversion tc = { .time_mult = 0, };
330 bool cap_user_time_zero = false, per_cpu_mmaps;
331 u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
332 u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
333 unsigned long max_non_turbo_ratio;
334 size_t filter_str_len;
335 const char *filter;
336 u64 *info;
337 int err;
338
339 if (priv_size != ptr->priv_size)
340 return -EINVAL;
341
342 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
343 intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
344 &noretcomp_bit);
345 intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit);
346 mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
347 "mtc_period");
348 intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit);
349
350 intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
351
352 if (perf_pmu__scan_file(intel_pt_pmu, "max_nonturbo_ratio",
353 "%lu", &max_non_turbo_ratio) != 1)
354 max_non_turbo_ratio = 0;
355
356 filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
357 filter_str_len = filter ? strlen(filter) : 0;
358
359 if (!session->evlist->nr_mmaps)
360 return -EINVAL;
361
362 pc = session->evlist->mmap[0].base;
363 if (pc) {
364 err = perf_read_tsc_conversion(pc, &tc);
365 if (err) {
366 if (err != -EOPNOTSUPP)
367 return err;
368 } else {
369 cap_user_time_zero = tc.time_mult != 0;
370 }
371 if (!cap_user_time_zero)
372 ui__warning("Intel Processor Trace: TSC not available\n");
373 }
374
375 per_cpu_mmaps = !cpu_map__empty(session->evlist->cpus);
376
377 auxtrace_info->type = PERF_AUXTRACE_INTEL_PT;
378 auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type;
379 auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift;
380 auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult;
381 auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero;
382 auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero;
383 auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit;
384 auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit;
385 auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch;
386 auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode;
387 auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps;
388 auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit;
389 auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits;
390 auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n;
391 auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
392 auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
393 auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO] = max_non_turbo_ratio;
394 auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] = filter_str_len;
395
396 info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
397
398 if (filter_str_len) {
399 size_t len = intel_pt_filter_bytes(filter);
400
401 strncpy((char *)info, filter, len);
402 info += len >> 3;
403 }
404
405 return 0;
406}
407
408static int intel_pt_track_switches(struct perf_evlist *evlist)
409{
410 const char *sched_switch = "sched:sched_switch";
411 struct perf_evsel *evsel;
412 int err;
413
414 if (!perf_evlist__can_select_event(evlist, sched_switch))
415 return -EPERM;
416
417 err = parse_events(evlist, sched_switch, NULL);
418 if (err) {
419 pr_debug2("%s: failed to parse %s, error %d\n",
420 __func__, sched_switch, err);
421 return err;
422 }
423
424 evsel = perf_evlist__last(evlist);
425
426 perf_evsel__set_sample_bit(evsel, CPU);
427 perf_evsel__set_sample_bit(evsel, TIME);
428
429 evsel->system_wide = true;
430 evsel->no_aux_samples = true;
431 evsel->immediate = true;
432
433 return 0;
434}
435
436static void intel_pt_valid_str(char *str, size_t len, u64 valid)
437{
438 unsigned int val, last = 0, state = 1;
439 int p = 0;
440
441 str[0] = '\0';
442
443 for (val = 0; val <= 64; val++, valid >>= 1) {
444 if (valid & 1) {
445 last = val;
446 switch (state) {
447 case 0:
448 p += scnprintf(str + p, len - p, ",");
449
450 case 1:
451 p += scnprintf(str + p, len - p, "%u", val);
452 state = 2;
453 break;
454 case 2:
455 state = 3;
456 break;
457 case 3:
458 state = 4;
459 break;
460 default:
461 break;
462 }
463 } else {
464 switch (state) {
465 case 3:
466 p += scnprintf(str + p, len - p, ",%u", last);
467 state = 0;
468 break;
469 case 4:
470 p += scnprintf(str + p, len - p, "-%u", last);
471 state = 0;
472 break;
473 default:
474 break;
475 }
476 if (state != 1)
477 state = 0;
478 }
479 }
480}
481
482static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
483 const char *caps, const char *name,
484 const char *supported, u64 config)
485{
486 char valid_str[256];
487 unsigned int shift;
488 unsigned long long valid;
489 u64 bits;
490 int ok;
491
492 if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1)
493 valid = 0;
494
495 if (supported &&
496 perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok)
497 valid = 0;
498
499 valid |= 1;
500
501 bits = perf_pmu__format_bits(&intel_pt_pmu->format, name);
502
503 config &= bits;
504
505 for (shift = 0; bits && !(bits & 1); shift++)
506 bits >>= 1;
507
508 config >>= shift;
509
510 if (config > 63)
511 goto out_err;
512
513 if (valid & (1 << config))
514 return 0;
515out_err:
516 intel_pt_valid_str(valid_str, sizeof(valid_str), valid);
517 pr_err("Invalid %s for %s. Valid values are: %s\n",
518 name, INTEL_PT_PMU_NAME, valid_str);
519 return -EINVAL;
520}
521
522static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
523 struct perf_evsel *evsel)
524{
525 int err;
526
527 if (!evsel)
528 return 0;
529
530 err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
531 "cyc_thresh", "caps/psb_cyc",
532 evsel->attr.config);
533 if (err)
534 return err;
535
536 err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods",
537 "mtc_period", "caps/mtc",
538 evsel->attr.config);
539 if (err)
540 return err;
541
542 return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods",
543 "psb_period", "caps/psb_cyc",
544 evsel->attr.config);
545}
546
547static int intel_pt_recording_options(struct auxtrace_record *itr,
548 struct perf_evlist *evlist,
549 struct record_opts *opts)
550{
551 struct intel_pt_recording *ptr =
552 container_of(itr, struct intel_pt_recording, itr);
553 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
554 bool have_timing_info, need_immediate = false;
555 struct perf_evsel *evsel, *intel_pt_evsel = NULL;
556 const struct cpu_map *cpus = evlist->cpus;
557 bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
558 u64 tsc_bit;
559 int err;
560
561 ptr->evlist = evlist;
562 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
563
564 evlist__for_each_entry(evlist, evsel) {
565 if (evsel->attr.type == intel_pt_pmu->type) {
566 if (intel_pt_evsel) {
567 pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n");
568 return -EINVAL;
569 }
570 evsel->attr.freq = 0;
571 evsel->attr.sample_period = 1;
572 intel_pt_evsel = evsel;
573 opts->full_auxtrace = true;
574 }
575 }
576
577 if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
578 pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n");
579 return -EINVAL;
580 }
581
582
583
584
585
586
587
588
589
590
591
592
593 if (!opts->full_auxtrace)
594 return 0;
595
596 err = intel_pt_validate_config(intel_pt_pmu, intel_pt_evsel);
597 if (err)
598 return err;
599
600
601 if (opts->auxtrace_snapshot_mode) {
602 size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
603
604 if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
605 if (privileged) {
606 opts->auxtrace_mmap_pages = MiB(4) / page_size;
607 } else {
608 opts->auxtrace_mmap_pages = KiB(128) / page_size;
609 if (opts->mmap_pages == UINT_MAX)
610 opts->mmap_pages = KiB(256) / page_size;
611 }
612 } else if (!opts->auxtrace_mmap_pages && !privileged &&
613 opts->mmap_pages == UINT_MAX) {
614 opts->mmap_pages = KiB(256) / page_size;
615 }
616 if (!opts->auxtrace_snapshot_size)
617 opts->auxtrace_snapshot_size =
618 opts->auxtrace_mmap_pages * (size_t)page_size;
619 if (!opts->auxtrace_mmap_pages) {
620 size_t sz = opts->auxtrace_snapshot_size;
621
622 sz = round_up(sz, page_size) / page_size;
623 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
624 }
625 if (opts->auxtrace_snapshot_size >
626 opts->auxtrace_mmap_pages * (size_t)page_size) {
627 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
628 opts->auxtrace_snapshot_size,
629 opts->auxtrace_mmap_pages * (size_t)page_size);
630 return -EINVAL;
631 }
632 if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
633 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
634 return -EINVAL;
635 }
636 pr_debug2("Intel PT snapshot size: %zu\n",
637 opts->auxtrace_snapshot_size);
638 if (psb_period &&
639 opts->auxtrace_snapshot_size <= psb_period +
640 INTEL_PT_PSB_PERIOD_NEAR)
641 ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n",
642 opts->auxtrace_snapshot_size, psb_period);
643 }
644
645
646 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
647 if (privileged) {
648 opts->auxtrace_mmap_pages = MiB(4) / page_size;
649 } else {
650 opts->auxtrace_mmap_pages = KiB(128) / page_size;
651 if (opts->mmap_pages == UINT_MAX)
652 opts->mmap_pages = KiB(256) / page_size;
653 }
654 }
655
656
657 if (opts->auxtrace_mmap_pages) {
658 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
659 size_t min_sz;
660
661 if (opts->auxtrace_snapshot_mode)
662 min_sz = KiB(4);
663 else
664 min_sz = KiB(8);
665
666 if (sz < min_sz || !is_power_of_2(sz)) {
667 pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n",
668 min_sz / 1024);
669 return -EINVAL;
670 }
671 }
672
673 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
674
675 if (opts->full_auxtrace && (intel_pt_evsel->attr.config & tsc_bit))
676 have_timing_info = true;
677 else
678 have_timing_info = false;
679
680
681
682
683
684 if (have_timing_info && !cpu_map__empty(cpus)) {
685 if (perf_can_record_switch_events()) {
686 bool cpu_wide = !target__none(&opts->target) &&
687 !target__has_task(&opts->target);
688
689 if (!cpu_wide && perf_can_record_cpu_wide()) {
690 struct perf_evsel *switch_evsel;
691
692 err = parse_events(evlist, "dummy:u", NULL);
693 if (err)
694 return err;
695
696 switch_evsel = perf_evlist__last(evlist);
697
698 switch_evsel->attr.freq = 0;
699 switch_evsel->attr.sample_period = 1;
700 switch_evsel->attr.context_switch = 1;
701
702 switch_evsel->system_wide = true;
703 switch_evsel->no_aux_samples = true;
704 switch_evsel->immediate = true;
705
706 perf_evsel__set_sample_bit(switch_evsel, TID);
707 perf_evsel__set_sample_bit(switch_evsel, TIME);
708 perf_evsel__set_sample_bit(switch_evsel, CPU);
709
710 opts->record_switch_events = false;
711 ptr->have_sched_switch = 3;
712 } else {
713 opts->record_switch_events = true;
714 need_immediate = true;
715 if (cpu_wide)
716 ptr->have_sched_switch = 3;
717 else
718 ptr->have_sched_switch = 2;
719 }
720 } else {
721 err = intel_pt_track_switches(evlist);
722 if (err == -EPERM)
723 pr_debug2("Unable to select sched:sched_switch\n");
724 else if (err)
725 return err;
726 else
727 ptr->have_sched_switch = 1;
728 }
729 }
730
731 if (intel_pt_evsel) {
732
733
734
735
736 perf_evlist__to_front(evlist, intel_pt_evsel);
737
738
739
740
741 if (!cpu_map__empty(cpus))
742 perf_evsel__set_sample_bit(intel_pt_evsel, CPU);
743 }
744
745
746 if (opts->full_auxtrace) {
747 struct perf_evsel *tracking_evsel;
748
749 err = parse_events(evlist, "dummy:u", NULL);
750 if (err)
751 return err;
752
753 tracking_evsel = perf_evlist__last(evlist);
754
755 perf_evlist__set_tracking_event(evlist, tracking_evsel);
756
757 tracking_evsel->attr.freq = 0;
758 tracking_evsel->attr.sample_period = 1;
759
760 if (need_immediate)
761 tracking_evsel->immediate = true;
762
763
764 if (!cpu_map__empty(cpus)) {
765 perf_evsel__set_sample_bit(tracking_evsel, TIME);
766
767 perf_evsel__set_sample_bit(tracking_evsel, CPU);
768 }
769 }
770
771
772
773
774
775 if (!ptr->have_sched_switch && !cpu_map__empty(cpus) &&
776 !target__none(&opts->target))
777 ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n");
778
779 return 0;
780}
781
782static int intel_pt_snapshot_start(struct auxtrace_record *itr)
783{
784 struct intel_pt_recording *ptr =
785 container_of(itr, struct intel_pt_recording, itr);
786 struct perf_evsel *evsel;
787
788 evlist__for_each_entry(ptr->evlist, evsel) {
789 if (evsel->attr.type == ptr->intel_pt_pmu->type)
790 return perf_evsel__disable(evsel);
791 }
792 return -EINVAL;
793}
794
795static int intel_pt_snapshot_finish(struct auxtrace_record *itr)
796{
797 struct intel_pt_recording *ptr =
798 container_of(itr, struct intel_pt_recording, itr);
799 struct perf_evsel *evsel;
800
801 evlist__for_each_entry(ptr->evlist, evsel) {
802 if (evsel->attr.type == ptr->intel_pt_pmu->type)
803 return perf_evsel__enable(evsel);
804 }
805 return -EINVAL;
806}
807
808static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx)
809{
810 const size_t sz = sizeof(struct intel_pt_snapshot_ref);
811 int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2;
812 struct intel_pt_snapshot_ref *refs;
813
814 if (!new_cnt)
815 new_cnt = 16;
816
817 while (new_cnt <= idx)
818 new_cnt *= 2;
819
820 refs = calloc(new_cnt, sz);
821 if (!refs)
822 return -ENOMEM;
823
824 memcpy(refs, ptr->snapshot_refs, cnt * sz);
825
826 ptr->snapshot_refs = refs;
827 ptr->snapshot_ref_cnt = new_cnt;
828
829 return 0;
830}
831
832static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr)
833{
834 int i;
835
836 for (i = 0; i < ptr->snapshot_ref_cnt; i++)
837 zfree(&ptr->snapshot_refs[i].ref_buf);
838 zfree(&ptr->snapshot_refs);
839}
840
841static void intel_pt_recording_free(struct auxtrace_record *itr)
842{
843 struct intel_pt_recording *ptr =
844 container_of(itr, struct intel_pt_recording, itr);
845
846 intel_pt_free_snapshot_refs(ptr);
847 free(ptr);
848}
849
850static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx,
851 size_t snapshot_buf_size)
852{
853 size_t ref_buf_size = ptr->snapshot_ref_buf_size;
854 void *ref_buf;
855
856 ref_buf = zalloc(ref_buf_size);
857 if (!ref_buf)
858 return -ENOMEM;
859
860 ptr->snapshot_refs[idx].ref_buf = ref_buf;
861 ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size;
862
863 return 0;
864}
865
866static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr,
867 size_t snapshot_buf_size)
868{
869 const size_t max_size = 256 * 1024;
870 size_t buf_size = 0, psb_period;
871
872 if (ptr->snapshot_size <= 64 * 1024)
873 return 0;
874
875 psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist);
876 if (psb_period)
877 buf_size = psb_period * 2;
878
879 if (!buf_size || buf_size > max_size)
880 buf_size = max_size;
881
882 if (buf_size >= snapshot_buf_size)
883 return 0;
884
885 if (buf_size >= ptr->snapshot_size / 2)
886 return 0;
887
888 return buf_size;
889}
890
891static int intel_pt_snapshot_init(struct intel_pt_recording *ptr,
892 size_t snapshot_buf_size)
893{
894 if (ptr->snapshot_init_done)
895 return 0;
896
897 ptr->snapshot_init_done = true;
898
899 ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr,
900 snapshot_buf_size);
901
902 return 0;
903}
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918static bool intel_pt_compare_buffers(void *buf1, size_t compare_size,
919 void *buf2, size_t offs2, size_t buf2_size)
920{
921 size_t end2 = offs2 + compare_size, part_size;
922
923 if (end2 <= buf2_size)
924 return memcmp(buf1, buf2 + offs2, compare_size);
925
926 part_size = end2 - buf2_size;
927 if (memcmp(buf1, buf2 + offs2, part_size))
928 return true;
929
930 compare_size -= part_size;
931
932 return memcmp(buf1 + part_size, buf2, compare_size);
933}
934
935static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset,
936 size_t ref_size, size_t buf_size,
937 void *data, size_t head)
938{
939 size_t ref_end = ref_offset + ref_size;
940
941 if (ref_end > buf_size) {
942 if (head > ref_offset || head < ref_end - buf_size)
943 return true;
944 } else if (head > ref_offset && head < ref_end) {
945 return true;
946 }
947
948 return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset,
949 buf_size);
950}
951
952static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size,
953 void *data, size_t head)
954{
955 if (head >= ref_size) {
956 memcpy(ref_buf, data + head - ref_size, ref_size);
957 } else {
958 memcpy(ref_buf, data, head);
959 ref_size -= head;
960 memcpy(ref_buf + head, data + buf_size - ref_size, ref_size);
961 }
962}
963
964static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx,
965 struct auxtrace_mmap *mm, unsigned char *data,
966 u64 head)
967{
968 struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx];
969 bool wrapped;
970
971 wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset,
972 ptr->snapshot_ref_buf_size, mm->len,
973 data, head);
974
975 intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len,
976 data, head);
977
978 return wrapped;
979}
980
981static bool intel_pt_first_wrap(u64 *data, size_t buf_size)
982{
983 int i, a, b;
984
985 b = buf_size >> 3;
986 a = b - 512;
987 if (a < 0)
988 a = 0;
989
990 for (i = a; i < b; i++) {
991 if (data[i])
992 return true;
993 }
994
995 return false;
996}
997
998static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx,
999 struct auxtrace_mmap *mm, unsigned char *data,
1000 u64 *head, u64 *old)
1001{
1002 struct intel_pt_recording *ptr =
1003 container_of(itr, struct intel_pt_recording, itr);
1004 bool wrapped;
1005 int err;
1006
1007 pr_debug3("%s: mmap index %d old head %zu new head %zu\n",
1008 __func__, idx, (size_t)*old, (size_t)*head);
1009
1010 err = intel_pt_snapshot_init(ptr, mm->len);
1011 if (err)
1012 goto out_err;
1013
1014 if (idx >= ptr->snapshot_ref_cnt) {
1015 err = intel_pt_alloc_snapshot_refs(ptr, idx);
1016 if (err)
1017 goto out_err;
1018 }
1019
1020 if (ptr->snapshot_ref_buf_size) {
1021 if (!ptr->snapshot_refs[idx].ref_buf) {
1022 err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len);
1023 if (err)
1024 goto out_err;
1025 }
1026 wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head);
1027 } else {
1028 wrapped = ptr->snapshot_refs[idx].wrapped;
1029 if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) {
1030 ptr->snapshot_refs[idx].wrapped = true;
1031 wrapped = true;
1032 }
1033 }
1034
1035
1036
1037
1038
1039
1040
1041 if (wrapped) {
1042 *old = *head;
1043 *head += mm->len;
1044 } else {
1045 if (mm->mask)
1046 *old &= mm->mask;
1047 else
1048 *old %= mm->len;
1049 if (*old > *head)
1050 *head += mm->len;
1051 }
1052
1053 pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n",
1054 __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head);
1055
1056 return 0;
1057
1058out_err:
1059 pr_err("%s: failed, error %d\n", __func__, err);
1060 return err;
1061}
1062
1063static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused)
1064{
1065 return rdtsc();
1066}
1067
1068static int intel_pt_read_finish(struct auxtrace_record *itr, int idx)
1069{
1070 struct intel_pt_recording *ptr =
1071 container_of(itr, struct intel_pt_recording, itr);
1072 struct perf_evsel *evsel;
1073
1074 evlist__for_each_entry(ptr->evlist, evsel) {
1075 if (evsel->attr.type == ptr->intel_pt_pmu->type)
1076 return perf_evlist__enable_event_idx(ptr->evlist, evsel,
1077 idx);
1078 }
1079 return -EINVAL;
1080}
1081
1082struct auxtrace_record *intel_pt_recording_init(int *err)
1083{
1084 struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
1085 struct intel_pt_recording *ptr;
1086
1087 if (!intel_pt_pmu)
1088 return NULL;
1089
1090 if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) {
1091 *err = -errno;
1092 return NULL;
1093 }
1094
1095 ptr = zalloc(sizeof(struct intel_pt_recording));
1096 if (!ptr) {
1097 *err = -ENOMEM;
1098 return NULL;
1099 }
1100
1101 ptr->intel_pt_pmu = intel_pt_pmu;
1102 ptr->itr.recording_options = intel_pt_recording_options;
1103 ptr->itr.info_priv_size = intel_pt_info_priv_size;
1104 ptr->itr.info_fill = intel_pt_info_fill;
1105 ptr->itr.free = intel_pt_recording_free;
1106 ptr->itr.snapshot_start = intel_pt_snapshot_start;
1107 ptr->itr.snapshot_finish = intel_pt_snapshot_finish;
1108 ptr->itr.find_snapshot = intel_pt_find_snapshot;
1109 ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options;
1110 ptr->itr.reference = intel_pt_reference;
1111 ptr->itr.read_finish = intel_pt_read_finish;
1112 return &ptr->itr;
1113}
1114
