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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 "../../perf.h"
17#include "../../util/session.h"
18#include "../../util/event.h"
19#include "../../util/evlist.h"
20#include "../../util/evsel.h"
21#include "../../util/cpumap.h"
22#include <subcmd/parse-options.h>
23#include "../../util/parse-events.h"
24#include "../../util/pmu.h"
25#include "../../util/debug.h"
26#include "../../util/auxtrace.h"
27#include "../../util/tsc.h"
28#include "../../util/intel-pt.h"
29
30#define KiB(x) ((x) * 1024)
31#define MiB(x) ((x) * 1024 * 1024)
32#define KiB_MASK(x) (KiB(x) - 1)
33#define MiB_MASK(x) (MiB(x) - 1)
34
35#define INTEL_PT_PSB_PERIOD_NEAR 256
36
37struct intel_pt_snapshot_ref {
38 void *ref_buf;
39 size_t ref_offset;
40 bool wrapped;
41};
42
43struct intel_pt_recording {
44 struct auxtrace_record itr;
45 struct perf_pmu *intel_pt_pmu;
46 int have_sched_switch;
47 struct perf_evlist *evlist;
48 bool snapshot_mode;
49 bool snapshot_init_done;
50 size_t snapshot_size;
51 size_t snapshot_ref_buf_size;
52 int snapshot_ref_cnt;
53 struct intel_pt_snapshot_ref *snapshot_refs;
54 size_t priv_size;
55};
56
57static int intel_pt_parse_terms_with_default(struct list_head *formats,
58 const char *str,
59 u64 *config)
60{
61 struct list_head *terms;
62 struct perf_event_attr attr = { .size = 0, };
63 int err;
64
65 terms = malloc(sizeof(struct list_head));
66 if (!terms)
67 return -ENOMEM;
68
69 INIT_LIST_HEAD(terms);
70
71 err = parse_events_terms(terms, str);
72 if (err)
73 goto out_free;
74
75 attr.config = *config;
76 err = perf_pmu__config_terms(formats, &attr, terms, true, NULL);
77 if (err)
78 goto out_free;
79
80 *config = attr.config;
81out_free:
82 parse_events_terms__delete(terms);
83 return err;
84}
85
86static int intel_pt_parse_terms(struct list_head *formats, const char *str,
87 u64 *config)
88{
89 *config = 0;
90 return intel_pt_parse_terms_with_default(formats, str, config);
91}
92
93static u64 intel_pt_masked_bits(u64 mask, u64 bits)
94{
95 const u64 top_bit = 1ULL << 63;
96 u64 res = 0;
97 int i;
98
99 for (i = 0; i < 64; i++) {
100 if (mask & top_bit) {
101 res <<= 1;
102 if (bits & top_bit)
103 res |= 1;
104 }
105 mask <<= 1;
106 bits <<= 1;
107 }
108
109 return res;
110}
111
112static int intel_pt_read_config(struct perf_pmu *intel_pt_pmu, const char *str,
113 struct perf_evlist *evlist, u64 *res)
114{
115 struct perf_evsel *evsel;
116 u64 mask;
117
118 *res = 0;
119
120 mask = perf_pmu__format_bits(&intel_pt_pmu->format, str);
121 if (!mask)
122 return -EINVAL;
123
124 evlist__for_each_entry(evlist, evsel) {
125 if (evsel->attr.type == intel_pt_pmu->type) {
126 *res = intel_pt_masked_bits(mask, evsel->attr.config);
127 return 0;
128 }
129 }
130
131 return -EINVAL;
132}
133
134static size_t intel_pt_psb_period(struct perf_pmu *intel_pt_pmu,
135 struct perf_evlist *evlist)
136{
137 u64 val;
138 int err, topa_multiple_entries;
139 size_t psb_period;
140
141 if (perf_pmu__scan_file(intel_pt_pmu, "caps/topa_multiple_entries",
142 "%d", &topa_multiple_entries) != 1)
143 topa_multiple_entries = 0;
144
145
146
147
148
149 if (!topa_multiple_entries) {
150 psb_period = 256;
151 goto out;
152 }
153
154 err = intel_pt_read_config(intel_pt_pmu, "psb_period", evlist, &val);
155 if (err)
156 val = 0;
157
158 psb_period = 1 << (val + 11);
159out:
160 pr_debug2("%s psb_period %zu\n", intel_pt_pmu->name, psb_period);
161 return psb_period;
162}
163
164static int intel_pt_pick_bit(int bits, int target)
165{
166 int pos, pick = -1;
167
168 for (pos = 0; bits; bits >>= 1, pos++) {
169 if (bits & 1) {
170 if (pos <= target || pick < 0)
171 pick = pos;
172 if (pos >= target)
173 break;
174 }
175 }
176
177 return pick;
178}
179
180static u64 intel_pt_default_config(struct perf_pmu *intel_pt_pmu)
181{
182 char buf[256];
183 int mtc, mtc_periods = 0, mtc_period;
184 int psb_cyc, psb_periods, psb_period;
185 int pos = 0;
186 u64 config;
187 char c;
188
189 pos += scnprintf(buf + pos, sizeof(buf) - pos, "tsc");
190
191 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc", "%d",
192 &mtc) != 1)
193 mtc = 1;
194
195 if (mtc) {
196 if (perf_pmu__scan_file(intel_pt_pmu, "caps/mtc_periods", "%x",
197 &mtc_periods) != 1)
198 mtc_periods = 0;
199 if (mtc_periods) {
200 mtc_period = intel_pt_pick_bit(mtc_periods, 3);
201 pos += scnprintf(buf + pos, sizeof(buf) - pos,
202 ",mtc,mtc_period=%d", mtc_period);
203 }
204 }
205
206 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_cyc", "%d",
207 &psb_cyc) != 1)
208 psb_cyc = 1;
209
210 if (psb_cyc && mtc_periods) {
211 if (perf_pmu__scan_file(intel_pt_pmu, "caps/psb_periods", "%x",
212 &psb_periods) != 1)
213 psb_periods = 0;
214 if (psb_periods) {
215 psb_period = intel_pt_pick_bit(psb_periods, 3);
216 pos += scnprintf(buf + pos, sizeof(buf) - pos,
217 ",psb_period=%d", psb_period);
218 }
219 }
220
221 if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
222 perf_pmu__scan_file(intel_pt_pmu, "format/branch", "%c", &c) == 1)
223 pos += scnprintf(buf + pos, sizeof(buf) - pos, ",pt,branch");
224
225 pr_debug2("%s default config: %s\n", intel_pt_pmu->name, buf);
226
227 intel_pt_parse_terms(&intel_pt_pmu->format, buf, &config);
228
229 return config;
230}
231
232static int intel_pt_parse_snapshot_options(struct auxtrace_record *itr,
233 struct record_opts *opts,
234 const char *str)
235{
236 struct intel_pt_recording *ptr =
237 container_of(itr, struct intel_pt_recording, itr);
238 unsigned long long snapshot_size = 0;
239 char *endptr;
240
241 if (str) {
242 snapshot_size = strtoull(str, &endptr, 0);
243 if (*endptr || snapshot_size > SIZE_MAX)
244 return -1;
245 }
246
247 opts->auxtrace_snapshot_mode = true;
248 opts->auxtrace_snapshot_size = snapshot_size;
249
250 ptr->snapshot_size = snapshot_size;
251
252 return 0;
253}
254
255struct perf_event_attr *
256intel_pt_pmu_default_config(struct perf_pmu *intel_pt_pmu)
257{
258 struct perf_event_attr *attr;
259
260 attr = zalloc(sizeof(struct perf_event_attr));
261 if (!attr)
262 return NULL;
263
264 attr->config = intel_pt_default_config(intel_pt_pmu);
265
266 intel_pt_pmu->selectable = true;
267
268 return attr;
269}
270
271static const char *intel_pt_find_filter(struct perf_evlist *evlist,
272 struct perf_pmu *intel_pt_pmu)
273{
274 struct perf_evsel *evsel;
275
276 evlist__for_each_entry(evlist, evsel) {
277 if (evsel->attr.type == intel_pt_pmu->type)
278 return evsel->filter;
279 }
280
281 return NULL;
282}
283
284static size_t intel_pt_filter_bytes(const char *filter)
285{
286 size_t len = filter ? strlen(filter) : 0;
287
288 return len ? roundup(len + 1, 8) : 0;
289}
290
291static size_t
292intel_pt_info_priv_size(struct auxtrace_record *itr, struct perf_evlist *evlist)
293{
294 struct intel_pt_recording *ptr =
295 container_of(itr, struct intel_pt_recording, itr);
296 const char *filter = intel_pt_find_filter(evlist, ptr->intel_pt_pmu);
297
298 ptr->priv_size = (INTEL_PT_AUXTRACE_PRIV_MAX * sizeof(u64)) +
299 intel_pt_filter_bytes(filter);
300
301 return ptr->priv_size;
302}
303
304static void intel_pt_tsc_ctc_ratio(u32 *n, u32 *d)
305{
306 unsigned int eax = 0, ebx = 0, ecx = 0, edx = 0;
307
308 __get_cpuid(0x15, &eax, &ebx, &ecx, &edx);
309 *n = ebx;
310 *d = eax;
311}
312
313static int intel_pt_info_fill(struct auxtrace_record *itr,
314 struct perf_session *session,
315 struct auxtrace_info_event *auxtrace_info,
316 size_t priv_size)
317{
318 struct intel_pt_recording *ptr =
319 container_of(itr, struct intel_pt_recording, itr);
320 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
321 struct perf_event_mmap_page *pc;
322 struct perf_tsc_conversion tc = { .time_mult = 0, };
323 bool cap_user_time_zero = false, per_cpu_mmaps;
324 u64 tsc_bit, mtc_bit, mtc_freq_bits, cyc_bit, noretcomp_bit;
325 u32 tsc_ctc_ratio_n, tsc_ctc_ratio_d;
326 unsigned long max_non_turbo_ratio;
327 size_t filter_str_len;
328 const char *filter;
329 u64 *info;
330 int err;
331
332 if (priv_size != ptr->priv_size)
333 return -EINVAL;
334
335 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
336 intel_pt_parse_terms(&intel_pt_pmu->format, "noretcomp",
337 &noretcomp_bit);
338 intel_pt_parse_terms(&intel_pt_pmu->format, "mtc", &mtc_bit);
339 mtc_freq_bits = perf_pmu__format_bits(&intel_pt_pmu->format,
340 "mtc_period");
341 intel_pt_parse_terms(&intel_pt_pmu->format, "cyc", &cyc_bit);
342
343 intel_pt_tsc_ctc_ratio(&tsc_ctc_ratio_n, &tsc_ctc_ratio_d);
344
345 if (perf_pmu__scan_file(intel_pt_pmu, "max_nonturbo_ratio",
346 "%lu", &max_non_turbo_ratio) != 1)
347 max_non_turbo_ratio = 0;
348
349 filter = intel_pt_find_filter(session->evlist, ptr->intel_pt_pmu);
350 filter_str_len = filter ? strlen(filter) : 0;
351
352 if (!session->evlist->nr_mmaps)
353 return -EINVAL;
354
355 pc = session->evlist->mmap[0].base;
356 if (pc) {
357 err = perf_read_tsc_conversion(pc, &tc);
358 if (err) {
359 if (err != -EOPNOTSUPP)
360 return err;
361 } else {
362 cap_user_time_zero = tc.time_mult != 0;
363 }
364 if (!cap_user_time_zero)
365 ui__warning("Intel Processor Trace: TSC not available\n");
366 }
367
368 per_cpu_mmaps = !cpu_map__empty(session->evlist->cpus);
369
370 auxtrace_info->type = PERF_AUXTRACE_INTEL_PT;
371 auxtrace_info->priv[INTEL_PT_PMU_TYPE] = intel_pt_pmu->type;
372 auxtrace_info->priv[INTEL_PT_TIME_SHIFT] = tc.time_shift;
373 auxtrace_info->priv[INTEL_PT_TIME_MULT] = tc.time_mult;
374 auxtrace_info->priv[INTEL_PT_TIME_ZERO] = tc.time_zero;
375 auxtrace_info->priv[INTEL_PT_CAP_USER_TIME_ZERO] = cap_user_time_zero;
376 auxtrace_info->priv[INTEL_PT_TSC_BIT] = tsc_bit;
377 auxtrace_info->priv[INTEL_PT_NORETCOMP_BIT] = noretcomp_bit;
378 auxtrace_info->priv[INTEL_PT_HAVE_SCHED_SWITCH] = ptr->have_sched_switch;
379 auxtrace_info->priv[INTEL_PT_SNAPSHOT_MODE] = ptr->snapshot_mode;
380 auxtrace_info->priv[INTEL_PT_PER_CPU_MMAPS] = per_cpu_mmaps;
381 auxtrace_info->priv[INTEL_PT_MTC_BIT] = mtc_bit;
382 auxtrace_info->priv[INTEL_PT_MTC_FREQ_BITS] = mtc_freq_bits;
383 auxtrace_info->priv[INTEL_PT_TSC_CTC_N] = tsc_ctc_ratio_n;
384 auxtrace_info->priv[INTEL_PT_TSC_CTC_D] = tsc_ctc_ratio_d;
385 auxtrace_info->priv[INTEL_PT_CYC_BIT] = cyc_bit;
386 auxtrace_info->priv[INTEL_PT_MAX_NONTURBO_RATIO] = max_non_turbo_ratio;
387 auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] = filter_str_len;
388
389 info = &auxtrace_info->priv[INTEL_PT_FILTER_STR_LEN] + 1;
390
391 if (filter_str_len) {
392 size_t len = intel_pt_filter_bytes(filter);
393
394 strncpy((char *)info, filter, len);
395 info += len >> 3;
396 }
397
398 return 0;
399}
400
401static int intel_pt_track_switches(struct perf_evlist *evlist)
402{
403 const char *sched_switch = "sched:sched_switch";
404 struct perf_evsel *evsel;
405 int err;
406
407 if (!perf_evlist__can_select_event(evlist, sched_switch))
408 return -EPERM;
409
410 err = parse_events(evlist, sched_switch, NULL);
411 if (err) {
412 pr_debug2("%s: failed to parse %s, error %d\n",
413 __func__, sched_switch, err);
414 return err;
415 }
416
417 evsel = perf_evlist__last(evlist);
418
419 perf_evsel__set_sample_bit(evsel, CPU);
420 perf_evsel__set_sample_bit(evsel, TIME);
421
422 evsel->system_wide = true;
423 evsel->no_aux_samples = true;
424 evsel->immediate = true;
425
426 return 0;
427}
428
429static void intel_pt_valid_str(char *str, size_t len, u64 valid)
430{
431 unsigned int val, last = 0, state = 1;
432 int p = 0;
433
434 str[0] = '\0';
435
436 for (val = 0; val <= 64; val++, valid >>= 1) {
437 if (valid & 1) {
438 last = val;
439 switch (state) {
440 case 0:
441 p += scnprintf(str + p, len - p, ",");
442
443 case 1:
444 p += scnprintf(str + p, len - p, "%u", val);
445 state = 2;
446 break;
447 case 2:
448 state = 3;
449 break;
450 case 3:
451 state = 4;
452 break;
453 default:
454 break;
455 }
456 } else {
457 switch (state) {
458 case 3:
459 p += scnprintf(str + p, len - p, ",%u", last);
460 state = 0;
461 break;
462 case 4:
463 p += scnprintf(str + p, len - p, "-%u", last);
464 state = 0;
465 break;
466 default:
467 break;
468 }
469 if (state != 1)
470 state = 0;
471 }
472 }
473}
474
475static int intel_pt_val_config_term(struct perf_pmu *intel_pt_pmu,
476 const char *caps, const char *name,
477 const char *supported, u64 config)
478{
479 char valid_str[256];
480 unsigned int shift;
481 unsigned long long valid;
482 u64 bits;
483 int ok;
484
485 if (perf_pmu__scan_file(intel_pt_pmu, caps, "%llx", &valid) != 1)
486 valid = 0;
487
488 if (supported &&
489 perf_pmu__scan_file(intel_pt_pmu, supported, "%d", &ok) == 1 && !ok)
490 valid = 0;
491
492 valid |= 1;
493
494 bits = perf_pmu__format_bits(&intel_pt_pmu->format, name);
495
496 config &= bits;
497
498 for (shift = 0; bits && !(bits & 1); shift++)
499 bits >>= 1;
500
501 config >>= shift;
502
503 if (config > 63)
504 goto out_err;
505
506 if (valid & (1 << config))
507 return 0;
508out_err:
509 intel_pt_valid_str(valid_str, sizeof(valid_str), valid);
510 pr_err("Invalid %s for %s. Valid values are: %s\n",
511 name, INTEL_PT_PMU_NAME, valid_str);
512 return -EINVAL;
513}
514
515static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
516 struct perf_evsel *evsel)
517{
518 int err;
519 char c;
520
521 if (!evsel)
522 return 0;
523
524
525
526
527
528 if (perf_pmu__scan_file(intel_pt_pmu, "format/pt", "%c", &c) == 1 &&
529 !(evsel->attr.config & 1)) {
530 pr_warning("pt=0 doesn't make sense, forcing pt=1\n");
531 evsel->attr.config |= 1;
532 }
533
534 err = intel_pt_val_config_term(intel_pt_pmu, "caps/cycle_thresholds",
535 "cyc_thresh", "caps/psb_cyc",
536 evsel->attr.config);
537 if (err)
538 return err;
539
540 err = intel_pt_val_config_term(intel_pt_pmu, "caps/mtc_periods",
541 "mtc_period", "caps/mtc",
542 evsel->attr.config);
543 if (err)
544 return err;
545
546 return intel_pt_val_config_term(intel_pt_pmu, "caps/psb_periods",
547 "psb_period", "caps/psb_cyc",
548 evsel->attr.config);
549}
550
551static int intel_pt_recording_options(struct auxtrace_record *itr,
552 struct perf_evlist *evlist,
553 struct record_opts *opts)
554{
555 struct intel_pt_recording *ptr =
556 container_of(itr, struct intel_pt_recording, itr);
557 struct perf_pmu *intel_pt_pmu = ptr->intel_pt_pmu;
558 bool have_timing_info, need_immediate = false;
559 struct perf_evsel *evsel, *intel_pt_evsel = NULL;
560 const struct cpu_map *cpus = evlist->cpus;
561 bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
562 u64 tsc_bit;
563 int err;
564
565 ptr->evlist = evlist;
566 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
567
568 evlist__for_each_entry(evlist, evsel) {
569 if (evsel->attr.type == intel_pt_pmu->type) {
570 if (intel_pt_evsel) {
571 pr_err("There may be only one " INTEL_PT_PMU_NAME " event\n");
572 return -EINVAL;
573 }
574 evsel->attr.freq = 0;
575 evsel->attr.sample_period = 1;
576 intel_pt_evsel = evsel;
577 opts->full_auxtrace = true;
578 }
579 }
580
581 if (opts->auxtrace_snapshot_mode && !opts->full_auxtrace) {
582 pr_err("Snapshot mode (-S option) requires " INTEL_PT_PMU_NAME " PMU event (-e " INTEL_PT_PMU_NAME ")\n");
583 return -EINVAL;
584 }
585
586 if (opts->use_clockid) {
587 pr_err("Cannot use clockid (-k option) with " INTEL_PT_PMU_NAME "\n");
588 return -EINVAL;
589 }
590
591 if (!opts->full_auxtrace)
592 return 0;
593
594 err = intel_pt_validate_config(intel_pt_pmu, intel_pt_evsel);
595 if (err)
596 return err;
597
598
599 if (opts->auxtrace_snapshot_mode) {
600 size_t psb_period = intel_pt_psb_period(intel_pt_pmu, evlist);
601
602 if (!opts->auxtrace_snapshot_size && !opts->auxtrace_mmap_pages) {
603 if (privileged) {
604 opts->auxtrace_mmap_pages = MiB(4) / page_size;
605 } else {
606 opts->auxtrace_mmap_pages = KiB(128) / page_size;
607 if (opts->mmap_pages == UINT_MAX)
608 opts->mmap_pages = KiB(256) / page_size;
609 }
610 } else if (!opts->auxtrace_mmap_pages && !privileged &&
611 opts->mmap_pages == UINT_MAX) {
612 opts->mmap_pages = KiB(256) / page_size;
613 }
614 if (!opts->auxtrace_snapshot_size)
615 opts->auxtrace_snapshot_size =
616 opts->auxtrace_mmap_pages * (size_t)page_size;
617 if (!opts->auxtrace_mmap_pages) {
618 size_t sz = opts->auxtrace_snapshot_size;
619
620 sz = round_up(sz, page_size) / page_size;
621 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
622 }
623 if (opts->auxtrace_snapshot_size >
624 opts->auxtrace_mmap_pages * (size_t)page_size) {
625 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
626 opts->auxtrace_snapshot_size,
627 opts->auxtrace_mmap_pages * (size_t)page_size);
628 return -EINVAL;
629 }
630 if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) {
631 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
632 return -EINVAL;
633 }
634 pr_debug2("Intel PT snapshot size: %zu\n",
635 opts->auxtrace_snapshot_size);
636 if (psb_period &&
637 opts->auxtrace_snapshot_size <= psb_period +
638 INTEL_PT_PSB_PERIOD_NEAR)
639 ui__warning("Intel PT snapshot size (%zu) may be too small for PSB period (%zu)\n",
640 opts->auxtrace_snapshot_size, psb_period);
641 }
642
643
644 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
645 if (privileged) {
646 opts->auxtrace_mmap_pages = MiB(4) / page_size;
647 } else {
648 opts->auxtrace_mmap_pages = KiB(128) / page_size;
649 if (opts->mmap_pages == UINT_MAX)
650 opts->mmap_pages = KiB(256) / page_size;
651 }
652 }
653
654
655 if (opts->auxtrace_mmap_pages) {
656 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
657 size_t min_sz;
658
659 if (opts->auxtrace_snapshot_mode)
660 min_sz = KiB(4);
661 else
662 min_sz = KiB(8);
663
664 if (sz < min_sz || !is_power_of_2(sz)) {
665 pr_err("Invalid mmap size for Intel Processor Trace: must be at least %zuKiB and a power of 2\n",
666 min_sz / 1024);
667 return -EINVAL;
668 }
669 }
670
671 intel_pt_parse_terms(&intel_pt_pmu->format, "tsc", &tsc_bit);
672
673 if (opts->full_auxtrace && (intel_pt_evsel->attr.config & tsc_bit))
674 have_timing_info = true;
675 else
676 have_timing_info = false;
677
678
679
680
681
682 if (have_timing_info && !cpu_map__empty(cpus)) {
683 if (perf_can_record_switch_events()) {
684 bool cpu_wide = !target__none(&opts->target) &&
685 !target__has_task(&opts->target);
686
687 if (!cpu_wide && perf_can_record_cpu_wide()) {
688 struct perf_evsel *switch_evsel;
689
690 err = parse_events(evlist, "dummy:u", NULL);
691 if (err)
692 return err;
693
694 switch_evsel = perf_evlist__last(evlist);
695
696 switch_evsel->attr.freq = 0;
697 switch_evsel->attr.sample_period = 1;
698 switch_evsel->attr.context_switch = 1;
699
700 switch_evsel->system_wide = true;
701 switch_evsel->no_aux_samples = true;
702 switch_evsel->immediate = true;
703
704 perf_evsel__set_sample_bit(switch_evsel, TID);
705 perf_evsel__set_sample_bit(switch_evsel, TIME);
706 perf_evsel__set_sample_bit(switch_evsel, CPU);
707 perf_evsel__reset_sample_bit(switch_evsel, BRANCH_STACK);
708
709 opts->record_switch_events = false;
710 ptr->have_sched_switch = 3;
711 } else {
712 opts->record_switch_events = true;
713 need_immediate = true;
714 if (cpu_wide)
715 ptr->have_sched_switch = 3;
716 else
717 ptr->have_sched_switch = 2;
718 }
719 } else {
720 err = intel_pt_track_switches(evlist);
721 if (err == -EPERM)
722 pr_debug2("Unable to select sched:sched_switch\n");
723 else if (err)
724 return err;
725 else
726 ptr->have_sched_switch = 1;
727 }
728 }
729
730 if (intel_pt_evsel) {
731
732
733
734
735 perf_evlist__to_front(evlist, intel_pt_evsel);
736
737
738
739
740 if (!cpu_map__empty(cpus))
741 perf_evsel__set_sample_bit(intel_pt_evsel, CPU);
742 }
743
744
745 if (opts->full_auxtrace) {
746 struct perf_evsel *tracking_evsel;
747
748 err = parse_events(evlist, "dummy:u", NULL);
749 if (err)
750 return err;
751
752 tracking_evsel = perf_evlist__last(evlist);
753
754 perf_evlist__set_tracking_event(evlist, tracking_evsel);
755
756 tracking_evsel->attr.freq = 0;
757 tracking_evsel->attr.sample_period = 1;
758
759 tracking_evsel->no_aux_samples = true;
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 perf_evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
770 }
771
772
773
774
775
776 if (!ptr->have_sched_switch && !cpu_map__empty(cpus) &&
777 !target__none(&opts->target))
778 ui__warning("Intel Processor Trace decoding will not be possible except for kernel tracing!\n");
779
780 return 0;
781}
782
783static int intel_pt_snapshot_start(struct auxtrace_record *itr)
784{
785 struct intel_pt_recording *ptr =
786 container_of(itr, struct intel_pt_recording, itr);
787 struct perf_evsel *evsel;
788
789 evlist__for_each_entry(ptr->evlist, evsel) {
790 if (evsel->attr.type == ptr->intel_pt_pmu->type)
791 return perf_evsel__disable(evsel);
792 }
793 return -EINVAL;
794}
795
796static int intel_pt_snapshot_finish(struct auxtrace_record *itr)
797{
798 struct intel_pt_recording *ptr =
799 container_of(itr, struct intel_pt_recording, itr);
800 struct perf_evsel *evsel;
801
802 evlist__for_each_entry(ptr->evlist, evsel) {
803 if (evsel->attr.type == ptr->intel_pt_pmu->type)
804 return perf_evsel__enable(evsel);
805 }
806 return -EINVAL;
807}
808
809static int intel_pt_alloc_snapshot_refs(struct intel_pt_recording *ptr, int idx)
810{
811 const size_t sz = sizeof(struct intel_pt_snapshot_ref);
812 int cnt = ptr->snapshot_ref_cnt, new_cnt = cnt * 2;
813 struct intel_pt_snapshot_ref *refs;
814
815 if (!new_cnt)
816 new_cnt = 16;
817
818 while (new_cnt <= idx)
819 new_cnt *= 2;
820
821 refs = calloc(new_cnt, sz);
822 if (!refs)
823 return -ENOMEM;
824
825 memcpy(refs, ptr->snapshot_refs, cnt * sz);
826
827 ptr->snapshot_refs = refs;
828 ptr->snapshot_ref_cnt = new_cnt;
829
830 return 0;
831}
832
833static void intel_pt_free_snapshot_refs(struct intel_pt_recording *ptr)
834{
835 int i;
836
837 for (i = 0; i < ptr->snapshot_ref_cnt; i++)
838 zfree(&ptr->snapshot_refs[i].ref_buf);
839 zfree(&ptr->snapshot_refs);
840}
841
842static void intel_pt_recording_free(struct auxtrace_record *itr)
843{
844 struct intel_pt_recording *ptr =
845 container_of(itr, struct intel_pt_recording, itr);
846
847 intel_pt_free_snapshot_refs(ptr);
848 free(ptr);
849}
850
851static int intel_pt_alloc_snapshot_ref(struct intel_pt_recording *ptr, int idx,
852 size_t snapshot_buf_size)
853{
854 size_t ref_buf_size = ptr->snapshot_ref_buf_size;
855 void *ref_buf;
856
857 ref_buf = zalloc(ref_buf_size);
858 if (!ref_buf)
859 return -ENOMEM;
860
861 ptr->snapshot_refs[idx].ref_buf = ref_buf;
862 ptr->snapshot_refs[idx].ref_offset = snapshot_buf_size - ref_buf_size;
863
864 return 0;
865}
866
867static size_t intel_pt_snapshot_ref_buf_size(struct intel_pt_recording *ptr,
868 size_t snapshot_buf_size)
869{
870 const size_t max_size = 256 * 1024;
871 size_t buf_size = 0, psb_period;
872
873 if (ptr->snapshot_size <= 64 * 1024)
874 return 0;
875
876 psb_period = intel_pt_psb_period(ptr->intel_pt_pmu, ptr->evlist);
877 if (psb_period)
878 buf_size = psb_period * 2;
879
880 if (!buf_size || buf_size > max_size)
881 buf_size = max_size;
882
883 if (buf_size >= snapshot_buf_size)
884 return 0;
885
886 if (buf_size >= ptr->snapshot_size / 2)
887 return 0;
888
889 return buf_size;
890}
891
892static int intel_pt_snapshot_init(struct intel_pt_recording *ptr,
893 size_t snapshot_buf_size)
894{
895 if (ptr->snapshot_init_done)
896 return 0;
897
898 ptr->snapshot_init_done = true;
899
900 ptr->snapshot_ref_buf_size = intel_pt_snapshot_ref_buf_size(ptr,
901 snapshot_buf_size);
902
903 return 0;
904}
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919static bool intel_pt_compare_buffers(void *buf1, size_t compare_size,
920 void *buf2, size_t offs2, size_t buf2_size)
921{
922 size_t end2 = offs2 + compare_size, part_size;
923
924 if (end2 <= buf2_size)
925 return memcmp(buf1, buf2 + offs2, compare_size);
926
927 part_size = end2 - buf2_size;
928 if (memcmp(buf1, buf2 + offs2, part_size))
929 return true;
930
931 compare_size -= part_size;
932
933 return memcmp(buf1 + part_size, buf2, compare_size);
934}
935
936static bool intel_pt_compare_ref(void *ref_buf, size_t ref_offset,
937 size_t ref_size, size_t buf_size,
938 void *data, size_t head)
939{
940 size_t ref_end = ref_offset + ref_size;
941
942 if (ref_end > buf_size) {
943 if (head > ref_offset || head < ref_end - buf_size)
944 return true;
945 } else if (head > ref_offset && head < ref_end) {
946 return true;
947 }
948
949 return intel_pt_compare_buffers(ref_buf, ref_size, data, ref_offset,
950 buf_size);
951}
952
953static void intel_pt_copy_ref(void *ref_buf, size_t ref_size, size_t buf_size,
954 void *data, size_t head)
955{
956 if (head >= ref_size) {
957 memcpy(ref_buf, data + head - ref_size, ref_size);
958 } else {
959 memcpy(ref_buf, data, head);
960 ref_size -= head;
961 memcpy(ref_buf + head, data + buf_size - ref_size, ref_size);
962 }
963}
964
965static bool intel_pt_wrapped(struct intel_pt_recording *ptr, int idx,
966 struct auxtrace_mmap *mm, unsigned char *data,
967 u64 head)
968{
969 struct intel_pt_snapshot_ref *ref = &ptr->snapshot_refs[idx];
970 bool wrapped;
971
972 wrapped = intel_pt_compare_ref(ref->ref_buf, ref->ref_offset,
973 ptr->snapshot_ref_buf_size, mm->len,
974 data, head);
975
976 intel_pt_copy_ref(ref->ref_buf, ptr->snapshot_ref_buf_size, mm->len,
977 data, head);
978
979 return wrapped;
980}
981
982static bool intel_pt_first_wrap(u64 *data, size_t buf_size)
983{
984 int i, a, b;
985
986 b = buf_size >> 3;
987 a = b - 512;
988 if (a < 0)
989 a = 0;
990
991 for (i = a; i < b; i++) {
992 if (data[i])
993 return true;
994 }
995
996 return false;
997}
998
999static int intel_pt_find_snapshot(struct auxtrace_record *itr, int idx,
1000 struct auxtrace_mmap *mm, unsigned char *data,
1001 u64 *head, u64 *old)
1002{
1003 struct intel_pt_recording *ptr =
1004 container_of(itr, struct intel_pt_recording, itr);
1005 bool wrapped;
1006 int err;
1007
1008 pr_debug3("%s: mmap index %d old head %zu new head %zu\n",
1009 __func__, idx, (size_t)*old, (size_t)*head);
1010
1011 err = intel_pt_snapshot_init(ptr, mm->len);
1012 if (err)
1013 goto out_err;
1014
1015 if (idx >= ptr->snapshot_ref_cnt) {
1016 err = intel_pt_alloc_snapshot_refs(ptr, idx);
1017 if (err)
1018 goto out_err;
1019 }
1020
1021 if (ptr->snapshot_ref_buf_size) {
1022 if (!ptr->snapshot_refs[idx].ref_buf) {
1023 err = intel_pt_alloc_snapshot_ref(ptr, idx, mm->len);
1024 if (err)
1025 goto out_err;
1026 }
1027 wrapped = intel_pt_wrapped(ptr, idx, mm, data, *head);
1028 } else {
1029 wrapped = ptr->snapshot_refs[idx].wrapped;
1030 if (!wrapped && intel_pt_first_wrap((u64 *)data, mm->len)) {
1031 ptr->snapshot_refs[idx].wrapped = true;
1032 wrapped = true;
1033 }
1034 }
1035
1036
1037
1038
1039
1040
1041
1042 if (wrapped) {
1043 *old = *head;
1044 *head += mm->len;
1045 } else {
1046 if (mm->mask)
1047 *old &= mm->mask;
1048 else
1049 *old %= mm->len;
1050 if (*old > *head)
1051 *head += mm->len;
1052 }
1053
1054 pr_debug3("%s: wrap-around %sdetected, adjusted old head %zu adjusted new head %zu\n",
1055 __func__, wrapped ? "" : "not ", (size_t)*old, (size_t)*head);
1056
1057 return 0;
1058
1059out_err:
1060 pr_err("%s: failed, error %d\n", __func__, err);
1061 return err;
1062}
1063
1064static u64 intel_pt_reference(struct auxtrace_record *itr __maybe_unused)
1065{
1066 return rdtsc();
1067}
1068
1069static int intel_pt_read_finish(struct auxtrace_record *itr, int idx)
1070{
1071 struct intel_pt_recording *ptr =
1072 container_of(itr, struct intel_pt_recording, itr);
1073 struct perf_evsel *evsel;
1074
1075 evlist__for_each_entry(ptr->evlist, evsel) {
1076 if (evsel->attr.type == ptr->intel_pt_pmu->type)
1077 return perf_evlist__enable_event_idx(ptr->evlist, evsel,
1078 idx);
1079 }
1080 return -EINVAL;
1081}
1082
1083struct auxtrace_record *intel_pt_recording_init(int *err)
1084{
1085 struct perf_pmu *intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
1086 struct intel_pt_recording *ptr;
1087
1088 if (!intel_pt_pmu)
1089 return NULL;
1090
1091 if (setenv("JITDUMP_USE_ARCH_TIMESTAMP", "1", 1)) {
1092 *err = -errno;
1093 return NULL;
1094 }
1095
1096 ptr = zalloc(sizeof(struct intel_pt_recording));
1097 if (!ptr) {
1098 *err = -ENOMEM;
1099 return NULL;
1100 }
1101
1102 ptr->intel_pt_pmu = intel_pt_pmu;
1103 ptr->itr.recording_options = intel_pt_recording_options;
1104 ptr->itr.info_priv_size = intel_pt_info_priv_size;
1105 ptr->itr.info_fill = intel_pt_info_fill;
1106 ptr->itr.free = intel_pt_recording_free;
1107 ptr->itr.snapshot_start = intel_pt_snapshot_start;
1108 ptr->itr.snapshot_finish = intel_pt_snapshot_finish;
1109 ptr->itr.find_snapshot = intel_pt_find_snapshot;
1110 ptr->itr.parse_snapshot_options = intel_pt_parse_snapshot_options;
1111 ptr->itr.reference = intel_pt_reference;
1112 ptr->itr.read_finish = intel_pt_read_finish;
1113 return &ptr->itr;
1114}
1115
