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