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6
7#include <errno.h>
8#include <stdbool.h>
9#include <linux/kernel.h>
10#include <linux/types.h>
11#include <linux/bitops.h>
12#include <linux/log2.h>
13#include <linux/zalloc.h>
14#include <cpuid.h>
15
16#include "../../../util/session.h"
17#include "../../../util/event.h"
18#include "../../../util/evlist.h"
19#include "../../../util/evsel.h"
20#include "../../../util/evsel_config.h"
21#include "../../../util/cpumap.h"
22#include "../../../util/mmap.h"
23#include <subcmd/parse-options.h>
24#include "../../../util/parse-events.h"
25#include "../../../util/pmu.h"
26#include "../../../util/debug.h"
27#include "../../../util/auxtrace.h"
28#include "../../../util/perf_api_probe.h"
29#include "../../../util/record.h"
30#include "../../../util/target.h"
31#include "../../../util/tsc.h"
32#include <internal/lib.h>
33#include "../../../util/intel-pt.h"
34
35#define KiB(x) ((x) * 1024)
36#define MiB(x) ((x) * 1024 * 1024)
37#define KiB_MASK(x) (KiB(x) - 1)
38#define MiB_MASK(x) (MiB(x) - 1)
39
40#define INTEL_PT_PSB_PERIOD_NEAR 256
41
42struct intel_pt_snapshot_ref {
43 void *ref_buf;
44 size_t ref_offset;
45 bool wrapped;
46};
47
48struct intel_pt_recording {
49 struct auxtrace_record itr;
50 struct perf_pmu *intel_pt_pmu;
51 int have_sched_switch;
52 struct evlist *evlist;
53 bool snapshot_mode;
54 bool snapshot_init_done;
55 size_t snapshot_size;
56 size_t snapshot_ref_buf_size;
57 int snapshot_ref_cnt;
58 struct intel_pt_snapshot_ref *snapshot_refs;
59 size_t priv_size;
60};
61
62static int intel_pt_parse_terms_with_default(const char *pmu_name,
63 struct list_head *formats,
64 const char *str,
65 u64 *config)
66{
67 struct list_head *terms;
68 struct perf_event_attr attr = { .size = 0, };
69 int err;
70
71 terms = malloc(sizeof(struct list_head));
72 if (!terms)
73 return -ENOMEM;
74
75 INIT_LIST_HEAD(terms);
76
77 err = parse_events_terms(terms, str);
78 if (err)
79 goto out_free;
80
81 attr.config = *config;
82 err = perf_pmu__config_terms(pmu_name, formats, &attr, terms, true,
83 NULL);
84 if (err)
85 goto out_free;
86
87 *config = attr.config;
88out_free:
89 parse_events_terms__delete(terms);
90 return err;
91}
92
93static int intel_pt_parse_terms(const char *pmu_name, struct list_head *formats,
94 const char *str, u64 *config)
95{
96 *config = 0;
97 return intel_pt_parse_terms_with_default(pmu_name, formats, str,
98 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 evlist *evlist, u64 *res)
122{
123 struct 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->core.attr.type == intel_pt_pmu->type) {
134 *res = intel_pt_masked_bits(mask, evsel->core.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 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->name, &intel_pt_pmu->format, buf,
236 &config);
237
238 return config;
239}
240
241static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr,
242 struct record_opts *opts,
243 const char *str)
244{
245 struct intel_pt_recording *ptr =
246 container_of(itr, struct intel_pt_recording, itr);
247 unsigned long long snapshot_size = 0;
248 char *endptr;
249
250 if (str) {
251 snapshot_size = strtoull(str, &endptr, 0);
252 if (*endptr || snapshot_size > SIZE_MAX)
253 return -1;
254 }
255
256 opts->auxtrace_snapshot_mode = true;
257 opts->auxtrace_snapshot_size = snapshot_size;
258
259 ptr->snapshot_size = snapshot_size;
260
261 return 0;
262}
263
264struct perf_event_attr *
265intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
266{
267 struct perf_event_attr *attr;
268
269 attr = zalloc(sizeof(struct perf_event_attr));
270 if (!attr)
271 return NULL;
272
273 attr->config = intel_pt_default_config(intel_pt_pmu);
274
275 intel_pt_pmu->selectable = true;
276
277 return attr;
278}
279
280static const char *intel_pt_find_filter(struct evlist *evlist,
281 struct perf_pmu *intel_pt_pmu)
282{
283 struct evsel *evsel;
284
285 evlist__for_each_entry(evlist, evsel) {
286 if (evsel->core.attr.type == intel_pt_pmu->type)
287 return evsel->filter;
288 }
289
290 return NULL;
291}
292
293static size_t intel_pt_filter_bytes(const char *filter)
294{
295 size_t len = filter ? strlen(filter) : 0;
296
297 return len ? roundup(len + 1, 8) : 0;
298}
299
300static size_t
301intel_pt_info_priv_size(struct auxtrace_record *itr, struct evlist *evlist)
302{
303 struct intel_pt_recording *ptr =
304 container_of(itr, struct intel_pt_recording, itr);
305 const char *filter = intel_pt_find_filter(evlist, ptr->intel_pt_pmu);
306
307 ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
308 intel_pt_filter_bytes(filter);
309 ptr->priv_size += sizeof(u64);
310
311 return ptr->priv_size;
312}
313
314static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
315{
316 unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
317
318 __get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
319 *n = ebx;
320 *d = eax;
321}
322
323static int intel_pt_info_fill(struct auxtrace_record *itr,
324 struct perf_session *session,
325 struct perf_record_auxtrace_info *auxtrace_info,
326 size_t priv_size)
327{
328 struct intel_pt_recording *ptr =
329 container_of(itr, struct intel_pt_recording, itr);
330 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
331 struct perf_event_mmap_page *pc;
332 struct perf_tsc_conversion tc = { .time_mult = 0, };
333 bool cap_user_time_zero = false, per_cpu_mmaps;
334 u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
335 u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
336 unsigned long max_non_turbo_ratio;
337 size_t filter_str_len;
338 const char *filter;
339 int event_trace;
340 __u64 *info;
341 int err;
342
343 if (priv_size != ptr->priv_size)
344 return -EINVAL;
345
346 intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
347 "tsc", &tsc_bit);
348 intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
349 "noretcomp", &noretcomp_bit);
350 intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
351 "mtc", &mtc_bit);
352 mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
353 "mtc_period");
354 intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
355 "cyc", &cyc_bit);
356
357 intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
358
359 if (perf_pmu__scan_file(intel_pt_pmu, "max_nonturbo_ratio",
360 "%lu", &max_non_turbo_ratio) != 1)
361 max_non_turbo_ratio = 0;
362 if (perf_pmu__scan_file(intel_pt_pmu, "caps/event_trace",
363 "%d", &event_trace) != 1)
364 event_trace = 0;
365
366 filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
367 filter_str_len = filter ? strlen(filter) : 0;
368
369 if (!session->evlist->core.nr_mmaps)
370 return -EINVAL;
371
372 pc = session->evlist->mmap[0].core.base;
373 if (pc) {
374 err = perf_read_tsc_conversion(pc, &tc);
375 if (err) {
376 if (err != -EOPNOTSUPP)
377 return err;
378 } else {
379 cap_user_time_zero = tc.time_mult != 0;
380 }
381 if (!cap_user_time_zero)
382 ui__warning("Intel Processor Trace: TSC not available\n");
383 }
384
385 per_cpu_mmaps = !perf_cpu_map__empty(session->evlist->core.user_requested_cpus);
386
387 auxtrace_info->type = PERF_AUXTRACE_INTEL_PT;
388 auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type;
389 auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift;
390 auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult;
391 auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero;
392 auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero;
393 auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit;
394 auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit;
395 auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch;
396 auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode;
397 auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps;
398 auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit;
399 auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits;
400 auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n;
401 auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
402 auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
403 auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO] = max_non_turbo_ratio;
404 auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] = filter_str_len;
405
406 info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
407
408 if (filter_str_len) {
409 size_t len = intel_pt_filter_bytes(filter);
410
411 strncpy((char *)info, filter, len);
412 info += len >> 3;
413 }
414
415 *info++ = event_trace;
416
417 return 0;
418}
419
420static int intel_pt_track_switches(struct evlist *evlist)
421{
422 const char *sched_switch = "sched:sched_switch";
423 struct evsel *evsel;
424 int err;
425
426 if (!evlist__can_select_event(evlist, sched_switch))
427 return -EPERM;
428
429 err = parse_events(evlist, sched_switch, NULL);
430 if (err) {
431 pr_debug2("%s: failed to parse %s, error %d\n",
432 __func__, sched_switch, err);
433 return err;
434 }
435
436 evsel = evlist__last(evlist);
437
438 evsel__set_sample_bit(evsel, CPU);
439 evsel__set_sample_bit(evsel, TIME);
440
441 evsel->core.system_wide = true;
442 evsel->no_aux_samples = true;
443 evsel->immediate = true;
444
445 return 0;
446}
447
448static void intel_pt_valid_str(char *str, size_t len, u64 valid)
449{
450 unsigned int val, last = 0, state = 1;
451 int p = 0;
452
453 str[0] = '\0';
454
455 for (val = 0; val <= 64; val++, valid >>= 1) {
456 if (valid & 1) {
457 last = val;
458 switch (state) {
459 case 0:
460 p += scnprintf(str + p, len - p, ",");
461
462 case 1:
463 p += scnprintf(str + p, len - p, "%u", val);
464 state = 2;
465 break;
466 case 2:
467 state = 3;
468 break;
469 case 3:
470 state = 4;
471 break;
472 default:
473 break;
474 }
475 } else {
476 switch (state) {
477 case 3:
478 p += scnprintf(str + p, len - p, ",%u", last);
479 state = 0;
480 break;
481 case 4:
482 p += scnprintf(str + p, len - p, "-%u", last);
483 state = 0;
484 break;
485 default:
486 break;
487 }
488 if (state != 1)
489 state = 0;
490 }
491 }
492}
493
494static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
495 const char *caps, const char *name,
496 const char *supported, u64 config)
497{
498 char valid_str[256];
499 unsigned int shift;
500 unsigned long long valid;
501 u64 bits;
502 int ok;
503
504 if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1)
505 valid = 0;
506
507 if (supported &&
508 perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok)
509 valid = 0;
510
511 valid |= 1;
512
513 bits = perf_pmu__format_bits(&intel_pt_pmu->format, name);
514
515 config &= bits;
516
517 for (shift = 0; bits && !(bits & 1); shift++)
518 bits >>= 1;
519
520 config >>= shift;
521
522 if (config > 63)
523 goto out_err;
524
525 if (valid & (1 << config))
526 return 0;
527out_err:
528 intel_pt_valid_str(valid_str, sizeof(valid_str), valid);
529 pr_err("Invalid %s for %s. Valid values are: %s\n",
530 name, INTEL_PT_PMU_NAME, valid_str);
531 return -EINVAL;
532}
533
534static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
535 struct evsel *evsel)
536{
537 int err;
538 char c;
539
540 if (!evsel)
541 return 0;
542
543
544
545
546
547 if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
548 !(evsel->core.attr.config & 1)) {
549 pr_warning("pt=0 doesn't make sense, forcing pt=1\n");
550 evsel->core.attr.config |= 1;
551 }
552
553 err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
554 "cyc_thresh", "caps/psb_cyc",
555 evsel->core.attr.config);
556 if (err)
557 return err;
558
559 err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods",
560 "mtc_period", "caps/mtc",
561 evsel->core.attr.config);
562 if (err)
563 return err;
564
565 return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods",
566 "psb_period", "caps/psb_cyc",
567 evsel->core.attr.config);
568}
569
570static void intel_pt_config_sample_mode(struct perf_pmu *intel_pt_pmu,
571 struct evsel *evsel)
572{
573 u64 user_bits = 0, bits;
574 struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
575
576 if (term)
577 user_bits = term->val.cfg_chg;
578
579 bits = perf_pmu__format_bits(&intel_pt_pmu->format, "psb_period");
580
581
582 if (bits & user_bits)
583 return;
584
585
586 evsel->core.attr.config &= ~bits;
587}
588
589static void intel_pt_min_max_sample_sz(struct evlist *evlist,
590 size_t *min_sz, size_t *max_sz)
591{
592 struct evsel *evsel;
593
594 evlist__for_each_entry(evlist, evsel) {
595 size_t sz = evsel->core.attr.aux_sample_size;
596
597 if (!sz)
598 continue;
599 if (min_sz && (sz < *min_sz || !*min_sz))
600 *min_sz = sz;
601 if (max_sz && sz > *max_sz)
602 *max_sz = sz;
603 }
604}
605
606
607
608
609
610static bool intel_pt_too_many_aux_output(struct evlist *evlist)
611{
612 struct evsel *evsel;
613 int aux_output_cnt = 0;
614
615 evlist__for_each_entry(evlist, evsel)
616 aux_output_cnt += !!evsel->core.attr.aux_output;
617
618 if (aux_output_cnt > 1) {
619 pr_err(INTEL_PT_PMU_NAME " supports at most one event with aux-output\n");
620 return true;
621 }
622
623 return false;
624}
625
626static int intel_pt_recording_options(struct auxtrace_record *itr,
627 struct evlist *evlist,
628 struct record_opts *opts)
629{
630 struct intel_pt_recording *ptr =
631 container_of(itr, struct intel_pt_recording, itr);
632 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
633 bool have_timing_info, need_immediate = false;
634 struct evsel *evsel, *intel_pt_evsel = NULL;
635 const struct perf_cpu_map *cpus = evlist->core.user_requested_cpus;
636 bool privileged = perf_event_paranoid_check(-1);
637 u64 tsc_bit;
638 int err;
639
640 ptr->evlist = evlist;
641 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
642
643 evlist__for_each_entry(evlist, evsel) {
644 if (evsel->core.attr.type == intel_pt_pmu->type) {
645 if (intel_pt_evsel) {
646 pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n");
647 return -EINVAL;
648 }
649 evsel->core.attr.freq = 0;
650 evsel->core.attr.sample_period = 1;
651 evsel->no_aux_samples = true;
652 evsel->needs_auxtrace_mmap = true;
653 intel_pt_evsel = evsel;
654 opts->full_auxtrace = true;
655 }
656 }
657
658 if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
659 pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n");
660 return -EINVAL;
661 }
662
663 if (opts->auxtrace_snapshot_mode && opts->auxtrace_sample_mode) {
664 pr_err("Snapshot mode (" INTEL_PT_PMU_NAME " PMU) and sample trace cannot be used together\n");
665 return -EINVAL;
666 }
667
668 if (opts->use_clockid) {
669 pr_err("Cannot use clockid (-k option) with " INTEL_PT_PMU_NAME "\n");
670 return -EINVAL;
671 }
672
673 if (intel_pt_too_many_aux_output(evlist))
674 return -EINVAL;
675
676 if (!opts->full_auxtrace)
677 return 0;
678
679 if (opts->auxtrace_sample_mode)
680 intel_pt_config_sample_mode(intel_pt_pmu, intel_pt_evsel);
681
682 err = intel_pt_validate_config(intel_pt_pmu, intel_pt_evsel);
683 if (err)
684 return err;
685
686
687 if (opts->auxtrace_snapshot_mode) {
688 size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
689
690 if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
691 if (privileged) {
692 opts->auxtrace_mmap_pages = MiB(4) / page_size;
693 } else {
694 opts->auxtrace_mmap_pages = KiB(128) / page_size;
695 if (opts->mmap_pages == UINT_MAX)
696 opts->mmap_pages = KiB(256) / page_size;
697 }
698 } else if (!opts->auxtrace_mmap_pages && !privileged &&
699 opts->mmap_pages == UINT_MAX) {
700 opts->mmap_pages = KiB(256) / page_size;
701 }
702 if (!opts->auxtrace_snapshot_size)
703 opts->auxtrace_snapshot_size =
704 opts->auxtrace_mmap_pages * (size_t)page_size;
705 if (!opts->auxtrace_mmap_pages) {
706 size_t sz = opts->auxtrace_snapshot_size;
707
708 sz = round_up(sz, page_size) / page_size;
709 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
710 }
711 if (opts->auxtrace_snapshot_size >
712 opts->auxtrace_mmap_pages * (size_t)page_size) {
713 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
714 opts->auxtrace_snapshot_size,
715 opts->auxtrace_mmap_pages * (size_t)page_size);
716 return -EINVAL;
717 }
718 if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
719 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
720 return -EINVAL;
721 }
722 pr_debug2("Intel PT snapshot size: %zu\n",
723 opts->auxtrace_snapshot_size);
724 if (psb_period &&
725 opts->auxtrace_snapshot_size <= psb_period +
726 INTEL_PT_PSB_PERIOD_NEAR)
727 ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n",
728 opts->auxtrace_snapshot_size, psb_period);
729 }
730
731
732 if (opts->auxtrace_sample_mode) {
733 size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
734 size_t min_sz = 0, max_sz = 0;
735
736 intel_pt_min_max_sample_sz(evlist, &min_sz, &max_sz);
737 if (!opts->auxtrace_mmap_pages && !privileged &&
738 opts->mmap_pages == UINT_MAX)
739 opts->mmap_pages = KiB(256) / page_size;
740 if (!opts->auxtrace_mmap_pages) {
741 size_t sz = round_up(max_sz, page_size) / page_size;
742
743 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
744 }
745 if (max_sz > opts->auxtrace_mmap_pages * (size_t)page_size) {
746 pr_err("Sample size %zu must not be greater than AUX area tracing mmap size %zu\n",
747 max_sz,
748 opts->auxtrace_mmap_pages * (size_t)page_size);
749 return -EINVAL;
750 }
751 pr_debug2("Intel PT min. sample size: %zu max. sample size: %zu\n",
752 min_sz, max_sz);
753 if (psb_period &&
754 min_sz <= psb_period + INTEL_PT_PSB_PERIOD_NEAR)
755 ui__warning("Intel PT sample size (%zu) may be too small for PSB period (%zu)\n",
756 min_sz, psb_period);
757 }
758
759
760 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
761 if (privileged) {
762 opts->auxtrace_mmap_pages = MiB(4) / page_size;
763 } else {
764 opts->auxtrace_mmap_pages = KiB(128) / page_size;
765 if (opts->mmap_pages == UINT_MAX)
766 opts->mmap_pages = KiB(256) / page_size;
767 }
768 }
769
770
771 if (opts->auxtrace_mmap_pages) {
772 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
773 size_t min_sz;
774
775 if (opts->auxtrace_snapshot_mode || opts->auxtrace_sample_mode)
776 min_sz = KiB(4);
777 else
778 min_sz = KiB(8);
779
780 if (sz < min_sz || !is_power_of_2(sz)) {
781 pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n",
782 min_sz / 1024);
783 return -EINVAL;
784 }
785 }
786
787 if (!opts->auxtrace_snapshot_mode && !opts->auxtrace_sample_mode) {
788 u32 aux_watermark = opts->auxtrace_mmap_pages * page_size / 4;
789
790 intel_pt_evsel->core.attr.aux_watermark = aux_watermark;
791 }
792
793 intel_pt_parse_terms(intel_pt_pmu->name, &intel_pt_pmu->format,
794 "tsc", &tsc_bit);
795
796 if (opts->full_auxtrace && (intel_pt_evsel->core.attr.config & tsc_bit))
797 have_timing_info = true;
798 else
799 have_timing_info = false;
800
801
802
803
804
805 if (have_timing_info && !perf_cpu_map__empty(cpus) &&
806 !record_opts__no_switch_events(opts)) {
807 if (perf_can_record_switch_events()) {
808 bool cpu_wide = !target__none(&opts->target) &&
809 !target__has_task(&opts->target);
810
811 if (!cpu_wide && perf_can_record_cpu_wide()) {
812 struct evsel *switch_evsel;
813
814 switch_evsel = evlist__add_dummy_on_all_cpus(evlist);
815 if (!switch_evsel)
816 return -ENOMEM;
817
818 switch_evsel->core.attr.context_switch = 1;
819 switch_evsel->immediate = true;
820
821 evsel__set_sample_bit(switch_evsel, TID);
822 evsel__set_sample_bit(switch_evsel, TIME);
823 evsel__set_sample_bit(switch_evsel, CPU);
824 evsel__reset_sample_bit(switch_evsel, BRANCH_STACK);
825
826 opts->record_switch_events = false;
827 ptr->have_sched_switch = 3;
828 } else {
829 opts->record_switch_events = true;
830 need_immediate = true;
831 if (cpu_wide)
832 ptr->have_sched_switch = 3;
833 else
834 ptr->have_sched_switch = 2;
835 }
836 } else {
837 err = intel_pt_track_switches(evlist);
838 if (err == -EPERM)
839 pr_debug2("Unable to select sched:sched_switch\n");
840 else if (err)
841 return err;
842 else
843 ptr->have_sched_switch = 1;
844 }
845 }
846
847 if (have_timing_info && !intel_pt_evsel->core.attr.exclude_kernel &&
848 perf_can_record_text_poke_events() && perf_can_record_cpu_wide())
849 opts->text_poke = true;
850
851 if (intel_pt_evsel) {
852
853
854
855
856 evlist__to_front(evlist, intel_pt_evsel);
857
858
859
860
861 if (!perf_cpu_map__empty(cpus))
862 evsel__set_sample_bit(intel_pt_evsel, CPU);
863 }
864
865
866 if (opts->full_auxtrace) {
867 bool need_system_wide_tracking;
868 struct evsel *tracking_evsel;
869
870
871
872
873
874 need_system_wide_tracking = evlist->core.has_user_cpus &&
875 !intel_pt_evsel->core.attr.exclude_user;
876
877 tracking_evsel = evlist__add_aux_dummy(evlist, need_system_wide_tracking);
878 if (!tracking_evsel)
879 return -ENOMEM;
880
881 evlist__set_tracking_event(evlist, tracking_evsel);
882
883 if (need_immediate)
884 tracking_evsel->immediate = true;
885
886
887 if (!perf_cpu_map__empty(cpus)) {
888 evsel__set_sample_bit(tracking_evsel, TIME);
889
890 evsel__set_sample_bit(tracking_evsel, CPU);
891 }
892 evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
893 }
894
895
896
897
898
899 if (!ptr->have_sched_switch && !perf_cpu_map__empty(cpus) &&
900 !target__none(&opts->target) &&
901 !intel_pt_evsel->core.attr.exclude_user)
902 ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n");
903
904 return 0;
905}
906
907static int intel_pt_snapshot_start(struct auxtrace_record *itr)
908{
909 struct intel_pt_recording *ptr =
910 container_of(itr, struct intel_pt_recording, itr);
911 struct evsel *evsel;
912
913 evlist__for_each_entry(ptr->evlist, evsel) {
914 if (evsel->core.attr.type == ptr->intel_pt_pmu->type)
915 return evsel__disable(evsel);
916 }
917 return -EINVAL;
918}
919
920static int intel_pt_snapshot_finish(struct auxtrace_record *itr)
921{
922 struct intel_pt_recording *ptr =
923 container_of(itr, struct intel_pt_recording, itr);
924 struct evsel *evsel;
925
926 evlist__for_each_entry(ptr->evlist, evsel) {
927 if (evsel->core.attr.type == ptr->intel_pt_pmu->type)
928 return evsel__enable(evsel);
929 }
930 return -EINVAL;
931}
932
933static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx)
934{
935 const size_t sz = sizeof(struct intel_pt_snapshot_ref);
936 int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2;
937 struct intel_pt_snapshot_ref *refs;
938
939 if (!new_cnt)
940 new_cnt = 16;
941
942 while (new_cnt <= idx)
943 new_cnt *= 2;
944
945 refs = calloc(new_cnt, sz);
946 if (!refs)
947 return -ENOMEM;
948
949 memcpy(refs, ptr->snapshot_refs, cnt * sz);
950
951 ptr->snapshot_refs = refs;
952 ptr->snapshot_ref_cnt = new_cnt;
953
954 return 0;
955}
956
957static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr)
958{
959 int i;
960
961 for (i = 0; i < ptr->snapshot_ref_cnt; i++)
962 zfree(&ptr->snapshot_refs[i].ref_buf);
963 zfree(&ptr->snapshot_refs);
964}
965
966static void intel_pt_recording_free(struct auxtrace_record *itr)
967{
968 struct intel_pt_recording *ptr =
969 container_of(itr, struct intel_pt_recording, itr);
970
971 intel_pt_free_snapshot_refs(ptr);
972 free(ptr);
973}
974
975static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx,
976 size_t snapshot_buf_size)
977{
978 size_t ref_buf_size = ptr->snapshot_ref_buf_size;
979 void *ref_buf;
980
981 ref_buf = zalloc(ref_buf_size);
982 if (!ref_buf)
983 return -ENOMEM;
984
985 ptr->snapshot_refs[idx].ref_buf = ref_buf;
986 ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size;
987
988 return 0;
989}
990
991static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr,
992 size_t snapshot_buf_size)
993{
994 const size_t max_size = 256 * 1024;
995 size_t buf_size = 0, psb_period;
996
997 if (ptr->snapshot_size <= 64 * 1024)
998 return 0;
999
1000 psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist);
1001 if (psb_period)
1002 buf_size = psb_period * 2;
1003
1004 if (!buf_size || buf_size > max_size)
1005 buf_size = max_size;
1006
1007 if (buf_size >= snapshot_buf_size)
1008 return 0;
1009
1010 if (buf_size >= ptr->snapshot_size / 2)
1011 return 0;
1012
1013 return buf_size;
1014}
1015
1016static int intel_pt_snapshot_init(struct intel_pt_recording *ptr,
1017 size_t snapshot_buf_size)
1018{
1019 if (ptr->snapshot_init_done)
1020 return 0;
1021
1022 ptr->snapshot_init_done = true;
1023
1024 ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr,
1025 snapshot_buf_size);
1026
1027 return 0;
1028}
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043static bool intel_pt_compare_buffers(void *buf1, size_t compare_size,
1044 void *buf2, size_t offs2, size_t buf2_size)
1045{
1046 size_t end2 = offs2 + compare_size, part_size;
1047
1048 if (end2 <= buf2_size)
1049 return memcmp(buf1, buf2 + offs2, compare_size);
1050
1051 part_size = end2 - buf2_size;
1052 if (memcmp(buf1, buf2 + offs2, part_size))
1053 return true;
1054
1055 compare_size -= part_size;
1056
1057 return memcmp(buf1 + part_size, buf2, compare_size);
1058}
1059
1060static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset,
1061 size_t ref_size, size_t buf_size,
1062 void *data, size_t head)
1063{
1064 size_t ref_end = ref_offset + ref_size;
1065
1066 if (ref_end > buf_size) {
1067 if (head > ref_offset || head < ref_end - buf_size)
1068 return true;
1069 } else if (head > ref_offset && head < ref_end) {
1070 return true;
1071 }
1072
1073 return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset,
1074 buf_size);
1075}
1076
1077static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size,
1078 void *data, size_t head)
1079{
1080 if (head >= ref_size) {
1081 memcpy(ref_buf, data + head - ref_size, ref_size);
1082 } else {
1083 memcpy(ref_buf, data, head);
1084 ref_size -= head;
1085 memcpy(ref_buf + head, data + buf_size - ref_size, ref_size);
1086 }
1087}
1088
1089static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx,
1090 struct auxtrace_mmap *mm, unsigned char *data,
1091 u64 head)
1092{
1093 struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx];
1094 bool wrapped;
1095
1096 wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset,
1097 ptr->snapshot_ref_buf_size, mm->len,
1098 data, head);
1099
1100 intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len,
1101 data, head);
1102
1103 return wrapped;
1104}
1105
1106static bool intel_pt_first_wrap(u64 *data, size_t buf_size)
1107{
1108 int i, a, b;
1109
1110 b = buf_size >> 3;
1111 a = b - 512;
1112 if (a < 0)
1113 a = 0;
1114
1115 for (i = a; i < b; i++) {
1116 if (data[i])
1117 return true;
1118 }
1119
1120 return false;
1121}
1122
1123static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx,
1124 struct auxtrace_mmap *mm, unsigned char *data,
1125 u64 *head, u64 *old)
1126{
1127 struct intel_pt_recording *ptr =
1128 container_of(itr, struct intel_pt_recording, itr);
1129 bool wrapped;
1130 int err;
1131
1132 pr_debug3("%s: mmap index %d old head %zu new head %zu\n",
1133 __func__, idx, (size_t)*old, (size_t)*head);
1134
1135 err = intel_pt_snapshot_init(ptr, mm->len);
1136 if (err)
1137 goto out_err;
1138
1139 if (idx >= ptr->snapshot_ref_cnt) {
1140 err = intel_pt_alloc_snapshot_refs(ptr, idx);
1141 if (err)
1142 goto out_err;
1143 }
1144
1145 if (ptr->snapshot_ref_buf_size) {
1146 if (!ptr->snapshot_refs[idx].ref_buf) {
1147 err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len);
1148 if (err)
1149 goto out_err;
1150 }
1151 wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head);
1152 } else {
1153 wrapped = ptr->snapshot_refs[idx].wrapped;
1154 if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) {
1155 ptr->snapshot_refs[idx].wrapped = true;
1156 wrapped = true;
1157 }
1158 }
1159
1160
1161
1162
1163
1164
1165
1166 if (wrapped) {
1167 *old = *head;
1168 *head += mm->len;
1169 } else {
1170 if (mm->mask)
1171 *old &= mm->mask;
1172 else
1173 *old %= mm->len;
1174 if (*old > *head)
1175 *head += mm->len;
1176 }
1177
1178 pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n",
1179 __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head);
1180
1181 return 0;
1182
1183out_err:
1184 pr_err("%s: failed, error %d\n", __func__, err);
1185 return err;
1186}
1187
1188static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused)
1189{
1190 return rdtsc();
1191}
1192
1193struct auxtrace_record *intel_pt_recording_init(int *err)
1194{
1195 struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
1196 struct intel_pt_recording *ptr;
1197
1198 if (!intel_pt_pmu)
1199 return NULL;
1200
1201 if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) {
1202 *err = -errno;
1203 return NULL;
1204 }
1205
1206 ptr = zalloc(sizeof(struct intel_pt_recording));
1207 if (!ptr) {
1208 *err = -ENOMEM;
1209 return NULL;
1210 }
1211
1212 ptr->intel_pt_pmu = intel_pt_pmu;
1213 ptr->itr.pmu = intel_pt_pmu;
1214 ptr->itr.recording_options = intel_pt_recording_options;
1215 ptr->itr.info_priv_size = intel_pt_info_priv_size;
1216 ptr->itr.info_fill = intel_pt_info_fill;
1217 ptr->itr.free = intel_pt_recording_free;
1218 ptr->itr.snapshot_start = intel_pt_snapshot_start;
1219 ptr->itr.snapshot_finish = intel_pt_snapshot_finish;
1220 ptr->itr.find_snapshot = intel_pt_find_snapshot;
1221 ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options;
1222 ptr->itr.reference = intel_pt_reference;
1223 ptr->itr.read_finish = auxtrace_record__read_finish;
1224
1225
1226
1227
1228 ptr->itr.default_aux_sample_size = 4096;
1229 return &ptr->itr;
1230}
1231
