1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 *
5 * Parts came from builtin-{top,stat,record}.c, see those files for further
6 * copyright notes.
7 */
8
9 #include <byteswap.h>
10 #include <errno.h>
11 #include <inttypes.h>
12 #include <linux/bitops.h>
13 #include <api/fs/fs.h>
14 #include <api/fs/tracing_path.h>
15 #include <linux/hw_breakpoint.h>
16 #include <linux/perf_event.h>
17 #include <linux/compiler.h>
18 #include <linux/err.h>
19 #include <linux/zalloc.h>
20 #include <sys/ioctl.h>
21 #include <sys/resource.h>
22 #include <sys/types.h>
23 #include <dirent.h>
24 #include <stdlib.h>
25 #include <perf/evsel.h>
26 #include "asm/bug.h"
27 #include "bpf_counter.h"
28 #include "callchain.h"
29 #include "cgroup.h"
30 #include "counts.h"
31 #include "event.h"
32 #include "evsel.h"
33 #include "util/env.h"
34 #include "util/evsel_config.h"
35 #include "util/evsel_fprintf.h"
36 #include "evlist.h"
37 #include <perf/cpumap.h>
38 #include "thread_map.h"
39 #include "target.h"
40 #include "perf_regs.h"
41 #include "record.h"
42 #include "debug.h"
43 #include "trace-event.h"
44 #include "stat.h"
45 #include "string2.h"
46 #include "memswap.h"
47 #include "util.h"
48 #include "util/hashmap.h"
49 #include "off_cpu.h"
50 #include "pmu.h"
51 #include "pmus.h"
52 #include "../perf-sys.h"
53 #include "util/parse-branch-options.h"
54 #include "util/bpf-filter.h"
55 #include <internal/xyarray.h>
56 #include <internal/lib.h>
57 #include <internal/threadmap.h>
58
59 #include <linux/ctype.h>
60
61 #ifdef HAVE_LIBTRACEEVENT
62 #include <traceevent/event-parse.h>
63 #endif
64
65 struct perf_missing_features perf_missing_features;
66
67 static clockid_t clockid;
68
69 static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = {
70 NULL,
71 "duration_time",
72 "user_time",
73 "system_time",
74 };
75
perf_tool_event__to_str(enum perf_tool_event ev)76 const char *perf_tool_event__to_str(enum perf_tool_event ev)
77 {
78 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX)
79 return perf_tool_event__tool_names[ev];
80
81 return NULL;
82 }
83
perf_tool_event__from_str(const char * str)84 enum perf_tool_event perf_tool_event__from_str(const char *str)
85 {
86 int i;
87
88 perf_tool_event__for_each_event(i) {
89 if (!strcmp(str, perf_tool_event__tool_names[i]))
90 return i;
91 }
92 return PERF_TOOL_NONE;
93 }
94
95
evsel__no_extra_init(struct evsel * evsel __maybe_unused)96 static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
97 {
98 return 0;
99 }
100
test_attr__ready(void)101 void __weak test_attr__ready(void) { }
102
evsel__no_extra_fini(struct evsel * evsel __maybe_unused)103 static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
104 {
105 }
106
107 static struct {
108 size_t size;
109 int (*init)(struct evsel *evsel);
110 void (*fini)(struct evsel *evsel);
111 } perf_evsel__object = {
112 .size = sizeof(struct evsel),
113 .init = evsel__no_extra_init,
114 .fini = evsel__no_extra_fini,
115 };
116
evsel__object_config(size_t object_size,int (* init)(struct evsel * evsel),void (* fini)(struct evsel * evsel))117 int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
118 void (*fini)(struct evsel *evsel))
119 {
120
121 if (object_size == 0)
122 goto set_methods;
123
124 if (perf_evsel__object.size > object_size)
125 return -EINVAL;
126
127 perf_evsel__object.size = object_size;
128
129 set_methods:
130 if (init != NULL)
131 perf_evsel__object.init = init;
132
133 if (fini != NULL)
134 perf_evsel__object.fini = fini;
135
136 return 0;
137 }
138
139 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
140
__evsel__sample_size(u64 sample_type)141 int __evsel__sample_size(u64 sample_type)
142 {
143 u64 mask = sample_type & PERF_SAMPLE_MASK;
144 int size = 0;
145 int i;
146
147 for (i = 0; i < 64; i++) {
148 if (mask & (1ULL << i))
149 size++;
150 }
151
152 size *= sizeof(u64);
153
154 return size;
155 }
156
157 /**
158 * __perf_evsel__calc_id_pos - calculate id_pos.
159 * @sample_type: sample type
160 *
161 * This function returns the position of the event id (PERF_SAMPLE_ID or
162 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
163 * perf_record_sample.
164 */
__perf_evsel__calc_id_pos(u64 sample_type)165 static int __perf_evsel__calc_id_pos(u64 sample_type)
166 {
167 int idx = 0;
168
169 if (sample_type & PERF_SAMPLE_IDENTIFIER)
170 return 0;
171
172 if (!(sample_type & PERF_SAMPLE_ID))
173 return -1;
174
175 if (sample_type & PERF_SAMPLE_IP)
176 idx += 1;
177
178 if (sample_type & PERF_SAMPLE_TID)
179 idx += 1;
180
181 if (sample_type & PERF_SAMPLE_TIME)
182 idx += 1;
183
184 if (sample_type & PERF_SAMPLE_ADDR)
185 idx += 1;
186
187 return idx;
188 }
189
190 /**
191 * __perf_evsel__calc_is_pos - calculate is_pos.
192 * @sample_type: sample type
193 *
194 * This function returns the position (counting backwards) of the event id
195 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
196 * sample_id_all is used there is an id sample appended to non-sample events.
197 */
__perf_evsel__calc_is_pos(u64 sample_type)198 static int __perf_evsel__calc_is_pos(u64 sample_type)
199 {
200 int idx = 1;
201
202 if (sample_type & PERF_SAMPLE_IDENTIFIER)
203 return 1;
204
205 if (!(sample_type & PERF_SAMPLE_ID))
206 return -1;
207
208 if (sample_type & PERF_SAMPLE_CPU)
209 idx += 1;
210
211 if (sample_type & PERF_SAMPLE_STREAM_ID)
212 idx += 1;
213
214 return idx;
215 }
216
evsel__calc_id_pos(struct evsel * evsel)217 void evsel__calc_id_pos(struct evsel *evsel)
218 {
219 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
220 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
221 }
222
__evsel__set_sample_bit(struct evsel * evsel,enum perf_event_sample_format bit)223 void __evsel__set_sample_bit(struct evsel *evsel,
224 enum perf_event_sample_format bit)
225 {
226 if (!(evsel->core.attr.sample_type & bit)) {
227 evsel->core.attr.sample_type |= bit;
228 evsel->sample_size += sizeof(u64);
229 evsel__calc_id_pos(evsel);
230 }
231 }
232
__evsel__reset_sample_bit(struct evsel * evsel,enum perf_event_sample_format bit)233 void __evsel__reset_sample_bit(struct evsel *evsel,
234 enum perf_event_sample_format bit)
235 {
236 if (evsel->core.attr.sample_type & bit) {
237 evsel->core.attr.sample_type &= ~bit;
238 evsel->sample_size -= sizeof(u64);
239 evsel__calc_id_pos(evsel);
240 }
241 }
242
evsel__set_sample_id(struct evsel * evsel,bool can_sample_identifier)243 void evsel__set_sample_id(struct evsel *evsel,
244 bool can_sample_identifier)
245 {
246 if (can_sample_identifier) {
247 evsel__reset_sample_bit(evsel, ID);
248 evsel__set_sample_bit(evsel, IDENTIFIER);
249 } else {
250 evsel__set_sample_bit(evsel, ID);
251 }
252 evsel->core.attr.read_format |= PERF_FORMAT_ID;
253 }
254
255 /**
256 * evsel__is_function_event - Return whether given evsel is a function
257 * trace event
258 *
259 * @evsel - evsel selector to be tested
260 *
261 * Return %true if event is function trace event
262 */
evsel__is_function_event(struct evsel * evsel)263 bool evsel__is_function_event(struct evsel *evsel)
264 {
265 #define FUNCTION_EVENT "ftrace:function"
266
267 return evsel->name &&
268 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
269
270 #undef FUNCTION_EVENT
271 }
272
evsel__init(struct evsel * evsel,struct perf_event_attr * attr,int idx)273 void evsel__init(struct evsel *evsel,
274 struct perf_event_attr *attr, int idx)
275 {
276 perf_evsel__init(&evsel->core, attr, idx);
277 evsel->tracking = !idx;
278 evsel->unit = strdup("");
279 evsel->scale = 1.0;
280 evsel->max_events = ULONG_MAX;
281 evsel->evlist = NULL;
282 evsel->bpf_obj = NULL;
283 evsel->bpf_fd = -1;
284 INIT_LIST_HEAD(&evsel->config_terms);
285 INIT_LIST_HEAD(&evsel->bpf_counter_list);
286 INIT_LIST_HEAD(&evsel->bpf_filters);
287 perf_evsel__object.init(evsel);
288 evsel->sample_size = __evsel__sample_size(attr->sample_type);
289 evsel__calc_id_pos(evsel);
290 evsel->cmdline_group_boundary = false;
291 evsel->metric_events = NULL;
292 evsel->per_pkg_mask = NULL;
293 evsel->collect_stat = false;
294 evsel->pmu_name = NULL;
295 evsel->group_pmu_name = NULL;
296 evsel->skippable = false;
297 }
298
evsel__new_idx(struct perf_event_attr * attr,int idx)299 struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
300 {
301 struct evsel *evsel = zalloc(perf_evsel__object.size);
302
303 if (!evsel)
304 return NULL;
305 evsel__init(evsel, attr, idx);
306
307 if (evsel__is_bpf_output(evsel) && !attr->sample_type) {
308 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
309 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
310 evsel->core.attr.sample_period = 1;
311 }
312
313 if (evsel__is_clock(evsel)) {
314 free((char *)evsel->unit);
315 evsel->unit = strdup("msec");
316 evsel->scale = 1e-6;
317 }
318
319 return evsel;
320 }
321
copy_config_terms(struct list_head * dst,struct list_head * src)322 int copy_config_terms(struct list_head *dst, struct list_head *src)
323 {
324 struct evsel_config_term *pos, *tmp;
325
326 list_for_each_entry(pos, src, list) {
327 tmp = malloc(sizeof(*tmp));
328 if (tmp == NULL)
329 return -ENOMEM;
330
331 *tmp = *pos;
332 if (tmp->free_str) {
333 tmp->val.str = strdup(pos->val.str);
334 if (tmp->val.str == NULL) {
335 free(tmp);
336 return -ENOMEM;
337 }
338 }
339 list_add_tail(&tmp->list, dst);
340 }
341 return 0;
342 }
343
evsel__copy_config_terms(struct evsel * dst,struct evsel * src)344 static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
345 {
346 return copy_config_terms(&dst->config_terms, &src->config_terms);
347 }
348
349 /**
350 * evsel__clone - create a new evsel copied from @orig
351 * @orig: original evsel
352 *
353 * The assumption is that @orig is not configured nor opened yet.
354 * So we only care about the attributes that can be set while it's parsed.
355 */
evsel__clone(struct evsel * orig)356 struct evsel *evsel__clone(struct evsel *orig)
357 {
358 struct evsel *evsel;
359
360 BUG_ON(orig->core.fd);
361 BUG_ON(orig->counts);
362 BUG_ON(orig->priv);
363 BUG_ON(orig->per_pkg_mask);
364
365 /* cannot handle BPF objects for now */
366 if (orig->bpf_obj)
367 return NULL;
368
369 evsel = evsel__new(&orig->core.attr);
370 if (evsel == NULL)
371 return NULL;
372
373 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
374 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus);
375 evsel->core.threads = perf_thread_map__get(orig->core.threads);
376 evsel->core.nr_members = orig->core.nr_members;
377 evsel->core.system_wide = orig->core.system_wide;
378 evsel->core.requires_cpu = orig->core.requires_cpu;
379 evsel->core.is_pmu_core = orig->core.is_pmu_core;
380
381 if (orig->name) {
382 evsel->name = strdup(orig->name);
383 if (evsel->name == NULL)
384 goto out_err;
385 }
386 if (orig->group_name) {
387 evsel->group_name = strdup(orig->group_name);
388 if (evsel->group_name == NULL)
389 goto out_err;
390 }
391 if (orig->pmu_name) {
392 evsel->pmu_name = strdup(orig->pmu_name);
393 if (evsel->pmu_name == NULL)
394 goto out_err;
395 }
396 if (orig->group_pmu_name) {
397 evsel->group_pmu_name = strdup(orig->group_pmu_name);
398 if (evsel->group_pmu_name == NULL)
399 goto out_err;
400 }
401 if (orig->filter) {
402 evsel->filter = strdup(orig->filter);
403 if (evsel->filter == NULL)
404 goto out_err;
405 }
406 if (orig->metric_id) {
407 evsel->metric_id = strdup(orig->metric_id);
408 if (evsel->metric_id == NULL)
409 goto out_err;
410 }
411 evsel->cgrp = cgroup__get(orig->cgrp);
412 #ifdef HAVE_LIBTRACEEVENT
413 evsel->tp_format = orig->tp_format;
414 #endif
415 evsel->handler = orig->handler;
416 evsel->core.leader = orig->core.leader;
417
418 evsel->max_events = orig->max_events;
419 evsel->tool_event = orig->tool_event;
420 free((char *)evsel->unit);
421 evsel->unit = strdup(orig->unit);
422 if (evsel->unit == NULL)
423 goto out_err;
424
425 evsel->scale = orig->scale;
426 evsel->snapshot = orig->snapshot;
427 evsel->per_pkg = orig->per_pkg;
428 evsel->percore = orig->percore;
429 evsel->precise_max = orig->precise_max;
430 evsel->is_libpfm_event = orig->is_libpfm_event;
431
432 evsel->exclude_GH = orig->exclude_GH;
433 evsel->sample_read = orig->sample_read;
434 evsel->auto_merge_stats = orig->auto_merge_stats;
435 evsel->collect_stat = orig->collect_stat;
436 evsel->weak_group = orig->weak_group;
437 evsel->use_config_name = orig->use_config_name;
438 evsel->pmu = orig->pmu;
439
440 if (evsel__copy_config_terms(evsel, orig) < 0)
441 goto out_err;
442
443 return evsel;
444
445 out_err:
446 evsel__delete(evsel);
447 return NULL;
448 }
449
450 /*
451 * Returns pointer with encoded error via <linux/err.h> interface.
452 */
453 #ifdef HAVE_LIBTRACEEVENT
evsel__newtp_idx(const char * sys,const char * name,int idx)454 struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx)
455 {
456 struct evsel *evsel = zalloc(perf_evsel__object.size);
457 int err = -ENOMEM;
458
459 if (evsel == NULL) {
460 goto out_err;
461 } else {
462 struct perf_event_attr attr = {
463 .type = PERF_TYPE_TRACEPOINT,
464 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
465 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
466 };
467
468 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
469 goto out_free;
470
471 evsel->tp_format = trace_event__tp_format(sys, name);
472 if (IS_ERR(evsel->tp_format)) {
473 err = PTR_ERR(evsel->tp_format);
474 goto out_free;
475 }
476
477 event_attr_init(&attr);
478 attr.config = evsel->tp_format->id;
479 attr.sample_period = 1;
480 evsel__init(evsel, &attr, idx);
481 }
482
483 return evsel;
484
485 out_free:
486 zfree(&evsel->name);
487 free(evsel);
488 out_err:
489 return ERR_PTR(err);
490 }
491 #endif
492
493 const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = {
494 "cycles",
495 "instructions",
496 "cache-references",
497 "cache-misses",
498 "branches",
499 "branch-misses",
500 "bus-cycles",
501 "stalled-cycles-frontend",
502 "stalled-cycles-backend",
503 "ref-cycles",
504 };
505
506 char *evsel__bpf_counter_events;
507
evsel__match_bpf_counter_events(const char * name)508 bool evsel__match_bpf_counter_events(const char *name)
509 {
510 int name_len;
511 bool match;
512 char *ptr;
513
514 if (!evsel__bpf_counter_events)
515 return false;
516
517 ptr = strstr(evsel__bpf_counter_events, name);
518 name_len = strlen(name);
519
520 /* check name matches a full token in evsel__bpf_counter_events */
521 match = (ptr != NULL) &&
522 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
523 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
524
525 return match;
526 }
527
__evsel__hw_name(u64 config)528 static const char *__evsel__hw_name(u64 config)
529 {
530 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
531 return evsel__hw_names[config];
532
533 return "unknown-hardware";
534 }
535
evsel__add_modifiers(struct evsel * evsel,char * bf,size_t size)536 static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
537 {
538 int colon = 0, r = 0;
539 struct perf_event_attr *attr = &evsel->core.attr;
540 bool exclude_guest_default = false;
541
542 #define MOD_PRINT(context, mod) do { \
543 if (!attr->exclude_##context) { \
544 if (!colon) colon = ++r; \
545 r += scnprintf(bf + r, size - r, "%c", mod); \
546 } } while(0)
547
548 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
549 MOD_PRINT(kernel, 'k');
550 MOD_PRINT(user, 'u');
551 MOD_PRINT(hv, 'h');
552 exclude_guest_default = true;
553 }
554
555 if (attr->precise_ip) {
556 if (!colon)
557 colon = ++r;
558 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
559 exclude_guest_default = true;
560 }
561
562 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
563 MOD_PRINT(host, 'H');
564 MOD_PRINT(guest, 'G');
565 }
566 #undef MOD_PRINT
567 if (colon)
568 bf[colon - 1] = ':';
569 return r;
570 }
571
arch_evsel__hw_name(struct evsel * evsel,char * bf,size_t size)572 int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
573 {
574 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
575 }
576
evsel__hw_name(struct evsel * evsel,char * bf,size_t size)577 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
578 {
579 int r = arch_evsel__hw_name(evsel, bf, size);
580 return r + evsel__add_modifiers(evsel, bf + r, size - r);
581 }
582
583 const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = {
584 "cpu-clock",
585 "task-clock",
586 "page-faults",
587 "context-switches",
588 "cpu-migrations",
589 "minor-faults",
590 "major-faults",
591 "alignment-faults",
592 "emulation-faults",
593 "dummy",
594 };
595
__evsel__sw_name(u64 config)596 static const char *__evsel__sw_name(u64 config)
597 {
598 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
599 return evsel__sw_names[config];
600 return "unknown-software";
601 }
602
evsel__sw_name(struct evsel * evsel,char * bf,size_t size)603 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
604 {
605 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
606 return r + evsel__add_modifiers(evsel, bf + r, size - r);
607 }
608
evsel__tool_name(enum perf_tool_event ev,char * bf,size_t size)609 static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size)
610 {
611 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev));
612 }
613
__evsel__bp_name(char * bf,size_t size,u64 addr,u64 type)614 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
615 {
616 int r;
617
618 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
619
620 if (type & HW_BREAKPOINT_R)
621 r += scnprintf(bf + r, size - r, "r");
622
623 if (type & HW_BREAKPOINT_W)
624 r += scnprintf(bf + r, size - r, "w");
625
626 if (type & HW_BREAKPOINT_X)
627 r += scnprintf(bf + r, size - r, "x");
628
629 return r;
630 }
631
evsel__bp_name(struct evsel * evsel,char * bf,size_t size)632 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
633 {
634 struct perf_event_attr *attr = &evsel->core.attr;
635 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
636 return r + evsel__add_modifiers(evsel, bf + r, size - r);
637 }
638
639 const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
640 { "L1-dcache", "l1-d", "l1d", "L1-data", },
641 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
642 { "LLC", "L2", },
643 { "dTLB", "d-tlb", "Data-TLB", },
644 { "iTLB", "i-tlb", "Instruction-TLB", },
645 { "branch", "branches", "bpu", "btb", "bpc", },
646 { "node", },
647 };
648
649 const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
650 { "load", "loads", "read", },
651 { "store", "stores", "write", },
652 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
653 };
654
655 const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
656 { "refs", "Reference", "ops", "access", },
657 { "misses", "miss", },
658 };
659
660 #define C(x) PERF_COUNT_HW_CACHE_##x
661 #define CACHE_READ (1 << C(OP_READ))
662 #define CACHE_WRITE (1 << C(OP_WRITE))
663 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
664 #define COP(x) (1 << x)
665
666 /*
667 * cache operation stat
668 * L1I : Read and prefetch only
669 * ITLB and BPU : Read-only
670 */
671 static const unsigned long evsel__hw_cache_stat[C(MAX)] = {
672 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
673 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
674 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
675 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
676 [C(ITLB)] = (CACHE_READ),
677 [C(BPU)] = (CACHE_READ),
678 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
679 };
680
evsel__is_cache_op_valid(u8 type,u8 op)681 bool evsel__is_cache_op_valid(u8 type, u8 op)
682 {
683 if (evsel__hw_cache_stat[type] & COP(op))
684 return true; /* valid */
685 else
686 return false; /* invalid */
687 }
688
__evsel__hw_cache_type_op_res_name(u8 type,u8 op,u8 result,char * bf,size_t size)689 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
690 {
691 if (result) {
692 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
693 evsel__hw_cache_op[op][0],
694 evsel__hw_cache_result[result][0]);
695 }
696
697 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
698 evsel__hw_cache_op[op][1]);
699 }
700
__evsel__hw_cache_name(u64 config,char * bf,size_t size)701 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
702 {
703 u8 op, result, type = (config >> 0) & 0xff;
704 const char *err = "unknown-ext-hardware-cache-type";
705
706 if (type >= PERF_COUNT_HW_CACHE_MAX)
707 goto out_err;
708
709 op = (config >> 8) & 0xff;
710 err = "unknown-ext-hardware-cache-op";
711 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
712 goto out_err;
713
714 result = (config >> 16) & 0xff;
715 err = "unknown-ext-hardware-cache-result";
716 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
717 goto out_err;
718
719 err = "invalid-cache";
720 if (!evsel__is_cache_op_valid(type, op))
721 goto out_err;
722
723 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
724 out_err:
725 return scnprintf(bf, size, "%s", err);
726 }
727
evsel__hw_cache_name(struct evsel * evsel,char * bf,size_t size)728 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
729 {
730 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
731 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
732 }
733
evsel__raw_name(struct evsel * evsel,char * bf,size_t size)734 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
735 {
736 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
737 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
738 }
739
evsel__name(struct evsel * evsel)740 const char *evsel__name(struct evsel *evsel)
741 {
742 char bf[128];
743
744 if (!evsel)
745 goto out_unknown;
746
747 if (evsel->name)
748 return evsel->name;
749
750 switch (evsel->core.attr.type) {
751 case PERF_TYPE_RAW:
752 evsel__raw_name(evsel, bf, sizeof(bf));
753 break;
754
755 case PERF_TYPE_HARDWARE:
756 evsel__hw_name(evsel, bf, sizeof(bf));
757 break;
758
759 case PERF_TYPE_HW_CACHE:
760 evsel__hw_cache_name(evsel, bf, sizeof(bf));
761 break;
762
763 case PERF_TYPE_SOFTWARE:
764 if (evsel__is_tool(evsel))
765 evsel__tool_name(evsel->tool_event, bf, sizeof(bf));
766 else
767 evsel__sw_name(evsel, bf, sizeof(bf));
768 break;
769
770 case PERF_TYPE_TRACEPOINT:
771 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
772 break;
773
774 case PERF_TYPE_BREAKPOINT:
775 evsel__bp_name(evsel, bf, sizeof(bf));
776 break;
777
778 default:
779 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
780 evsel->core.attr.type);
781 break;
782 }
783
784 evsel->name = strdup(bf);
785
786 if (evsel->name)
787 return evsel->name;
788 out_unknown:
789 return "unknown";
790 }
791
evsel__name_is(struct evsel * evsel,const char * name)792 bool evsel__name_is(struct evsel *evsel, const char *name)
793 {
794 return !strcmp(evsel__name(evsel), name);
795 }
796
evsel__metric_id(const struct evsel * evsel)797 const char *evsel__metric_id(const struct evsel *evsel)
798 {
799 if (evsel->metric_id)
800 return evsel->metric_id;
801
802 if (evsel__is_tool(evsel))
803 return perf_tool_event__to_str(evsel->tool_event);
804
805 return "unknown";
806 }
807
evsel__group_name(struct evsel * evsel)808 const char *evsel__group_name(struct evsel *evsel)
809 {
810 return evsel->group_name ?: "anon group";
811 }
812
813 /*
814 * Returns the group details for the specified leader,
815 * with following rules.
816 *
817 * For record -e '{cycles,instructions}'
818 * 'anon group { cycles:u, instructions:u }'
819 *
820 * For record -e 'cycles,instructions' and report --group
821 * 'cycles:u, instructions:u'
822 */
evsel__group_desc(struct evsel * evsel,char * buf,size_t size)823 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
824 {
825 int ret = 0;
826 struct evsel *pos;
827 const char *group_name = evsel__group_name(evsel);
828
829 if (!evsel->forced_leader)
830 ret = scnprintf(buf, size, "%s { ", group_name);
831
832 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel));
833
834 for_each_group_member(pos, evsel)
835 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos));
836
837 if (!evsel->forced_leader)
838 ret += scnprintf(buf + ret, size - ret, " }");
839
840 return ret;
841 }
842
__evsel__config_callchain(struct evsel * evsel,struct record_opts * opts,struct callchain_param * param)843 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
844 struct callchain_param *param)
845 {
846 bool function = evsel__is_function_event(evsel);
847 struct perf_event_attr *attr = &evsel->core.attr;
848 const char *arch = perf_env__arch(evsel__env(evsel));
849
850 evsel__set_sample_bit(evsel, CALLCHAIN);
851
852 attr->sample_max_stack = param->max_stack;
853
854 if (opts->kernel_callchains)
855 attr->exclude_callchain_user = 1;
856 if (opts->user_callchains)
857 attr->exclude_callchain_kernel = 1;
858 if (param->record_mode == CALLCHAIN_LBR) {
859 if (!opts->branch_stack) {
860 if (attr->exclude_user) {
861 pr_warning("LBR callstack option is only available "
862 "to get user callchain information. "
863 "Falling back to framepointers.\n");
864 } else {
865 evsel__set_sample_bit(evsel, BRANCH_STACK);
866 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
867 PERF_SAMPLE_BRANCH_CALL_STACK |
868 PERF_SAMPLE_BRANCH_NO_CYCLES |
869 PERF_SAMPLE_BRANCH_NO_FLAGS |
870 PERF_SAMPLE_BRANCH_HW_INDEX;
871 }
872 } else
873 pr_warning("Cannot use LBR callstack with branch stack. "
874 "Falling back to framepointers.\n");
875 }
876
877 if (param->record_mode == CALLCHAIN_DWARF) {
878 if (!function) {
879 evsel__set_sample_bit(evsel, REGS_USER);
880 evsel__set_sample_bit(evsel, STACK_USER);
881 if (opts->sample_user_regs &&
882 DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) {
883 attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch);
884 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
885 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
886 "so the minimal registers set (IP, SP) is explicitly forced.\n");
887 } else {
888 attr->sample_regs_user |= arch__user_reg_mask();
889 }
890 attr->sample_stack_user = param->dump_size;
891 attr->exclude_callchain_user = 1;
892 } else {
893 pr_info("Cannot use DWARF unwind for function trace event,"
894 " falling back to framepointers.\n");
895 }
896 }
897
898 if (function) {
899 pr_info("Disabling user space callchains for function trace event.\n");
900 attr->exclude_callchain_user = 1;
901 }
902 }
903
evsel__config_callchain(struct evsel * evsel,struct record_opts * opts,struct callchain_param * param)904 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
905 struct callchain_param *param)
906 {
907 if (param->enabled)
908 return __evsel__config_callchain(evsel, opts, param);
909 }
910
evsel__reset_callgraph(struct evsel * evsel,struct callchain_param * param)911 static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param)
912 {
913 struct perf_event_attr *attr = &evsel->core.attr;
914
915 evsel__reset_sample_bit(evsel, CALLCHAIN);
916 if (param->record_mode == CALLCHAIN_LBR) {
917 evsel__reset_sample_bit(evsel, BRANCH_STACK);
918 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
919 PERF_SAMPLE_BRANCH_CALL_STACK |
920 PERF_SAMPLE_BRANCH_HW_INDEX);
921 }
922 if (param->record_mode == CALLCHAIN_DWARF) {
923 evsel__reset_sample_bit(evsel, REGS_USER);
924 evsel__reset_sample_bit(evsel, STACK_USER);
925 }
926 }
927
evsel__apply_config_terms(struct evsel * evsel,struct record_opts * opts,bool track)928 static void evsel__apply_config_terms(struct evsel *evsel,
929 struct record_opts *opts, bool track)
930 {
931 struct evsel_config_term *term;
932 struct list_head *config_terms = &evsel->config_terms;
933 struct perf_event_attr *attr = &evsel->core.attr;
934 /* callgraph default */
935 struct callchain_param param = {
936 .record_mode = callchain_param.record_mode,
937 };
938 u32 dump_size = 0;
939 int max_stack = 0;
940 const char *callgraph_buf = NULL;
941
942 list_for_each_entry(term, config_terms, list) {
943 switch (term->type) {
944 case EVSEL__CONFIG_TERM_PERIOD:
945 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
946 attr->sample_period = term->val.period;
947 attr->freq = 0;
948 evsel__reset_sample_bit(evsel, PERIOD);
949 }
950 break;
951 case EVSEL__CONFIG_TERM_FREQ:
952 if (!(term->weak && opts->user_freq != UINT_MAX)) {
953 attr->sample_freq = term->val.freq;
954 attr->freq = 1;
955 evsel__set_sample_bit(evsel, PERIOD);
956 }
957 break;
958 case EVSEL__CONFIG_TERM_TIME:
959 if (term->val.time)
960 evsel__set_sample_bit(evsel, TIME);
961 else
962 evsel__reset_sample_bit(evsel, TIME);
963 break;
964 case EVSEL__CONFIG_TERM_CALLGRAPH:
965 callgraph_buf = term->val.str;
966 break;
967 case EVSEL__CONFIG_TERM_BRANCH:
968 if (term->val.str && strcmp(term->val.str, "no")) {
969 evsel__set_sample_bit(evsel, BRANCH_STACK);
970 parse_branch_str(term->val.str,
971 &attr->branch_sample_type);
972 } else
973 evsel__reset_sample_bit(evsel, BRANCH_STACK);
974 break;
975 case EVSEL__CONFIG_TERM_STACK_USER:
976 dump_size = term->val.stack_user;
977 break;
978 case EVSEL__CONFIG_TERM_MAX_STACK:
979 max_stack = term->val.max_stack;
980 break;
981 case EVSEL__CONFIG_TERM_MAX_EVENTS:
982 evsel->max_events = term->val.max_events;
983 break;
984 case EVSEL__CONFIG_TERM_INHERIT:
985 /*
986 * attr->inherit should has already been set by
987 * evsel__config. If user explicitly set
988 * inherit using config terms, override global
989 * opt->no_inherit setting.
990 */
991 attr->inherit = term->val.inherit ? 1 : 0;
992 break;
993 case EVSEL__CONFIG_TERM_OVERWRITE:
994 attr->write_backward = term->val.overwrite ? 1 : 0;
995 break;
996 case EVSEL__CONFIG_TERM_DRV_CFG:
997 break;
998 case EVSEL__CONFIG_TERM_PERCORE:
999 break;
1000 case EVSEL__CONFIG_TERM_AUX_OUTPUT:
1001 attr->aux_output = term->val.aux_output ? 1 : 0;
1002 break;
1003 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
1004 /* Already applied by auxtrace */
1005 break;
1006 case EVSEL__CONFIG_TERM_CFG_CHG:
1007 break;
1008 default:
1009 break;
1010 }
1011 }
1012
1013 /* User explicitly set per-event callgraph, clear the old setting and reset. */
1014 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
1015 bool sample_address = false;
1016
1017 if (max_stack) {
1018 param.max_stack = max_stack;
1019 if (callgraph_buf == NULL)
1020 callgraph_buf = "fp";
1021 }
1022
1023 /* parse callgraph parameters */
1024 if (callgraph_buf != NULL) {
1025 if (!strcmp(callgraph_buf, "no")) {
1026 param.enabled = false;
1027 param.record_mode = CALLCHAIN_NONE;
1028 } else {
1029 param.enabled = true;
1030 if (parse_callchain_record(callgraph_buf, ¶m)) {
1031 pr_err("per-event callgraph setting for %s failed. "
1032 "Apply callgraph global setting for it\n",
1033 evsel->name);
1034 return;
1035 }
1036 if (param.record_mode == CALLCHAIN_DWARF)
1037 sample_address = true;
1038 }
1039 }
1040 if (dump_size > 0) {
1041 dump_size = round_up(dump_size, sizeof(u64));
1042 param.dump_size = dump_size;
1043 }
1044
1045 /* If global callgraph set, clear it */
1046 if (callchain_param.enabled)
1047 evsel__reset_callgraph(evsel, &callchain_param);
1048
1049 /* set perf-event callgraph */
1050 if (param.enabled) {
1051 if (sample_address) {
1052 evsel__set_sample_bit(evsel, ADDR);
1053 evsel__set_sample_bit(evsel, DATA_SRC);
1054 evsel->core.attr.mmap_data = track;
1055 }
1056 evsel__config_callchain(evsel, opts, ¶m);
1057 }
1058 }
1059 }
1060
__evsel__get_config_term(struct evsel * evsel,enum evsel_term_type type)1061 struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
1062 {
1063 struct evsel_config_term *term, *found_term = NULL;
1064
1065 list_for_each_entry(term, &evsel->config_terms, list) {
1066 if (term->type == type)
1067 found_term = term;
1068 }
1069
1070 return found_term;
1071 }
1072
arch_evsel__set_sample_weight(struct evsel * evsel)1073 void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
1074 {
1075 evsel__set_sample_bit(evsel, WEIGHT);
1076 }
1077
arch__post_evsel_config(struct evsel * evsel __maybe_unused,struct perf_event_attr * attr __maybe_unused)1078 void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
1079 struct perf_event_attr *attr __maybe_unused)
1080 {
1081 }
1082
evsel__set_default_freq_period(struct record_opts * opts,struct perf_event_attr * attr)1083 static void evsel__set_default_freq_period(struct record_opts *opts,
1084 struct perf_event_attr *attr)
1085 {
1086 if (opts->freq) {
1087 attr->freq = 1;
1088 attr->sample_freq = opts->freq;
1089 } else {
1090 attr->sample_period = opts->default_interval;
1091 }
1092 }
1093
evsel__is_offcpu_event(struct evsel * evsel)1094 static bool evsel__is_offcpu_event(struct evsel *evsel)
1095 {
1096 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT);
1097 }
1098
1099 /*
1100 * The enable_on_exec/disabled value strategy:
1101 *
1102 * 1) For any type of traced program:
1103 * - all independent events and group leaders are disabled
1104 * - all group members are enabled
1105 *
1106 * Group members are ruled by group leaders. They need to
1107 * be enabled, because the group scheduling relies on that.
1108 *
1109 * 2) For traced programs executed by perf:
1110 * - all independent events and group leaders have
1111 * enable_on_exec set
1112 * - we don't specifically enable or disable any event during
1113 * the record command
1114 *
1115 * Independent events and group leaders are initially disabled
1116 * and get enabled by exec. Group members are ruled by group
1117 * leaders as stated in 1).
1118 *
1119 * 3) For traced programs attached by perf (pid/tid):
1120 * - we specifically enable or disable all events during
1121 * the record command
1122 *
1123 * When attaching events to already running traced we
1124 * enable/disable events specifically, as there's no
1125 * initial traced exec call.
1126 */
evsel__config(struct evsel * evsel,struct record_opts * opts,struct callchain_param * callchain)1127 void evsel__config(struct evsel *evsel, struct record_opts *opts,
1128 struct callchain_param *callchain)
1129 {
1130 struct evsel *leader = evsel__leader(evsel);
1131 struct perf_event_attr *attr = &evsel->core.attr;
1132 int track = evsel->tracking;
1133 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
1134
1135 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
1136 attr->inherit = !opts->no_inherit;
1137 attr->write_backward = opts->overwrite ? 1 : 0;
1138 attr->read_format = PERF_FORMAT_LOST;
1139
1140 evsel__set_sample_bit(evsel, IP);
1141 evsel__set_sample_bit(evsel, TID);
1142
1143 if (evsel->sample_read) {
1144 evsel__set_sample_bit(evsel, READ);
1145
1146 /*
1147 * We need ID even in case of single event, because
1148 * PERF_SAMPLE_READ process ID specific data.
1149 */
1150 evsel__set_sample_id(evsel, false);
1151
1152 /*
1153 * Apply group format only if we belong to group
1154 * with more than one members.
1155 */
1156 if (leader->core.nr_members > 1) {
1157 attr->read_format |= PERF_FORMAT_GROUP;
1158 attr->inherit = 0;
1159 }
1160 }
1161
1162 /*
1163 * We default some events to have a default interval. But keep
1164 * it a weak assumption overridable by the user.
1165 */
1166 if ((evsel->is_libpfm_event && !attr->sample_period) ||
1167 (!evsel->is_libpfm_event && (!attr->sample_period ||
1168 opts->user_freq != UINT_MAX ||
1169 opts->user_interval != ULLONG_MAX)))
1170 evsel__set_default_freq_period(opts, attr);
1171
1172 /*
1173 * If attr->freq was set (here or earlier), ask for period
1174 * to be sampled.
1175 */
1176 if (attr->freq)
1177 evsel__set_sample_bit(evsel, PERIOD);
1178
1179 if (opts->no_samples)
1180 attr->sample_freq = 0;
1181
1182 if (opts->inherit_stat) {
1183 evsel->core.attr.read_format |=
1184 PERF_FORMAT_TOTAL_TIME_ENABLED |
1185 PERF_FORMAT_TOTAL_TIME_RUNNING |
1186 PERF_FORMAT_ID;
1187 attr->inherit_stat = 1;
1188 }
1189
1190 if (opts->sample_address) {
1191 evsel__set_sample_bit(evsel, ADDR);
1192 attr->mmap_data = track;
1193 }
1194
1195 /*
1196 * We don't allow user space callchains for function trace
1197 * event, due to issues with page faults while tracing page
1198 * fault handler and its overall trickiness nature.
1199 */
1200 if (evsel__is_function_event(evsel))
1201 evsel->core.attr.exclude_callchain_user = 1;
1202
1203 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1204 evsel__config_callchain(evsel, opts, callchain);
1205
1206 if (opts->sample_intr_regs && !evsel->no_aux_samples &&
1207 !evsel__is_dummy_event(evsel)) {
1208 attr->sample_regs_intr = opts->sample_intr_regs;
1209 evsel__set_sample_bit(evsel, REGS_INTR);
1210 }
1211
1212 if (opts->sample_user_regs && !evsel->no_aux_samples &&
1213 !evsel__is_dummy_event(evsel)) {
1214 attr->sample_regs_user |= opts->sample_user_regs;
1215 evsel__set_sample_bit(evsel, REGS_USER);
1216 }
1217
1218 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1219 evsel__set_sample_bit(evsel, CPU);
1220
1221 /*
1222 * When the user explicitly disabled time don't force it here.
1223 */
1224 if (opts->sample_time &&
1225 (!perf_missing_features.sample_id_all &&
1226 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1227 opts->sample_time_set)))
1228 evsel__set_sample_bit(evsel, TIME);
1229
1230 if (opts->raw_samples && !evsel->no_aux_samples) {
1231 evsel__set_sample_bit(evsel, TIME);
1232 evsel__set_sample_bit(evsel, RAW);
1233 evsel__set_sample_bit(evsel, CPU);
1234 }
1235
1236 if (opts->sample_address)
1237 evsel__set_sample_bit(evsel, DATA_SRC);
1238
1239 if (opts->sample_phys_addr)
1240 evsel__set_sample_bit(evsel, PHYS_ADDR);
1241
1242 if (opts->no_buffering) {
1243 attr->watermark = 0;
1244 attr->wakeup_events = 1;
1245 }
1246 if (opts->branch_stack && !evsel->no_aux_samples) {
1247 evsel__set_sample_bit(evsel, BRANCH_STACK);
1248 attr->branch_sample_type = opts->branch_stack;
1249 }
1250
1251 if (opts->sample_weight)
1252 arch_evsel__set_sample_weight(evsel);
1253
1254 attr->task = track;
1255 attr->mmap = track;
1256 attr->mmap2 = track && !perf_missing_features.mmap2;
1257 attr->comm = track;
1258 attr->build_id = track && opts->build_id;
1259
1260 /*
1261 * ksymbol is tracked separately with text poke because it needs to be
1262 * system wide and enabled immediately.
1263 */
1264 if (!opts->text_poke)
1265 attr->ksymbol = track && !perf_missing_features.ksymbol;
1266 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1267
1268 if (opts->record_namespaces)
1269 attr->namespaces = track;
1270
1271 if (opts->record_cgroup) {
1272 attr->cgroup = track && !perf_missing_features.cgroup;
1273 evsel__set_sample_bit(evsel, CGROUP);
1274 }
1275
1276 if (opts->sample_data_page_size)
1277 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
1278
1279 if (opts->sample_code_page_size)
1280 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
1281
1282 if (opts->record_switch_events)
1283 attr->context_switch = track;
1284
1285 if (opts->sample_transaction)
1286 evsel__set_sample_bit(evsel, TRANSACTION);
1287
1288 if (opts->running_time) {
1289 evsel->core.attr.read_format |=
1290 PERF_FORMAT_TOTAL_TIME_ENABLED |
1291 PERF_FORMAT_TOTAL_TIME_RUNNING;
1292 }
1293
1294 /*
1295 * XXX see the function comment above
1296 *
1297 * Disabling only independent events or group leaders,
1298 * keeping group members enabled.
1299 */
1300 if (evsel__is_group_leader(evsel))
1301 attr->disabled = 1;
1302
1303 /*
1304 * Setting enable_on_exec for independent events and
1305 * group leaders for traced executed by perf.
1306 */
1307 if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1308 !opts->target.initial_delay)
1309 attr->enable_on_exec = 1;
1310
1311 if (evsel->immediate) {
1312 attr->disabled = 0;
1313 attr->enable_on_exec = 0;
1314 }
1315
1316 clockid = opts->clockid;
1317 if (opts->use_clockid) {
1318 attr->use_clockid = 1;
1319 attr->clockid = opts->clockid;
1320 }
1321
1322 if (evsel->precise_max)
1323 attr->precise_ip = 3;
1324
1325 if (opts->all_user) {
1326 attr->exclude_kernel = 1;
1327 attr->exclude_user = 0;
1328 }
1329
1330 if (opts->all_kernel) {
1331 attr->exclude_kernel = 0;
1332 attr->exclude_user = 1;
1333 }
1334
1335 if (evsel->core.own_cpus || evsel->unit)
1336 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1337
1338 /*
1339 * Apply event specific term settings,
1340 * it overloads any global configuration.
1341 */
1342 evsel__apply_config_terms(evsel, opts, track);
1343
1344 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1345
1346 /* The --period option takes the precedence. */
1347 if (opts->period_set) {
1348 if (opts->period)
1349 evsel__set_sample_bit(evsel, PERIOD);
1350 else
1351 evsel__reset_sample_bit(evsel, PERIOD);
1352 }
1353
1354 /*
1355 * A dummy event never triggers any actual counter and therefore
1356 * cannot be used with branch_stack.
1357 *
1358 * For initial_delay, a dummy event is added implicitly.
1359 * The software event will trigger -EOPNOTSUPP error out,
1360 * if BRANCH_STACK bit is set.
1361 */
1362 if (evsel__is_dummy_event(evsel))
1363 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1364
1365 if (evsel__is_offcpu_event(evsel))
1366 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES;
1367
1368 arch__post_evsel_config(evsel, attr);
1369 }
1370
evsel__set_filter(struct evsel * evsel,const char * filter)1371 int evsel__set_filter(struct evsel *evsel, const char *filter)
1372 {
1373 char *new_filter = strdup(filter);
1374
1375 if (new_filter != NULL) {
1376 free(evsel->filter);
1377 evsel->filter = new_filter;
1378 return 0;
1379 }
1380
1381 return -1;
1382 }
1383
evsel__append_filter(struct evsel * evsel,const char * fmt,const char * filter)1384 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1385 {
1386 char *new_filter;
1387
1388 if (evsel->filter == NULL)
1389 return evsel__set_filter(evsel, filter);
1390
1391 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1392 free(evsel->filter);
1393 evsel->filter = new_filter;
1394 return 0;
1395 }
1396
1397 return -1;
1398 }
1399
evsel__append_tp_filter(struct evsel * evsel,const char * filter)1400 int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1401 {
1402 return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1403 }
1404
evsel__append_addr_filter(struct evsel * evsel,const char * filter)1405 int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1406 {
1407 return evsel__append_filter(evsel, "%s,%s", filter);
1408 }
1409
1410 /* Caller has to clear disabled after going through all CPUs. */
evsel__enable_cpu(struct evsel * evsel,int cpu_map_idx)1411 int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx)
1412 {
1413 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
1414 }
1415
evsel__enable(struct evsel * evsel)1416 int evsel__enable(struct evsel *evsel)
1417 {
1418 int err = perf_evsel__enable(&evsel->core);
1419
1420 if (!err)
1421 evsel->disabled = false;
1422 return err;
1423 }
1424
1425 /* Caller has to set disabled after going through all CPUs. */
evsel__disable_cpu(struct evsel * evsel,int cpu_map_idx)1426 int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx)
1427 {
1428 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx);
1429 }
1430
evsel__disable(struct evsel * evsel)1431 int evsel__disable(struct evsel *evsel)
1432 {
1433 int err = perf_evsel__disable(&evsel->core);
1434 /*
1435 * We mark it disabled here so that tools that disable a event can
1436 * ignore events after they disable it. I.e. the ring buffer may have
1437 * already a few more events queued up before the kernel got the stop
1438 * request.
1439 */
1440 if (!err)
1441 evsel->disabled = true;
1442
1443 return err;
1444 }
1445
free_config_terms(struct list_head * config_terms)1446 void free_config_terms(struct list_head *config_terms)
1447 {
1448 struct evsel_config_term *term, *h;
1449
1450 list_for_each_entry_safe(term, h, config_terms, list) {
1451 list_del_init(&term->list);
1452 if (term->free_str)
1453 zfree(&term->val.str);
1454 free(term);
1455 }
1456 }
1457
evsel__free_config_terms(struct evsel * evsel)1458 static void evsel__free_config_terms(struct evsel *evsel)
1459 {
1460 free_config_terms(&evsel->config_terms);
1461 }
1462
evsel__exit(struct evsel * evsel)1463 void evsel__exit(struct evsel *evsel)
1464 {
1465 assert(list_empty(&evsel->core.node));
1466 assert(evsel->evlist == NULL);
1467 bpf_counter__destroy(evsel);
1468 perf_bpf_filter__destroy(evsel);
1469 evsel__free_counts(evsel);
1470 perf_evsel__free_fd(&evsel->core);
1471 perf_evsel__free_id(&evsel->core);
1472 evsel__free_config_terms(evsel);
1473 cgroup__put(evsel->cgrp);
1474 perf_cpu_map__put(evsel->core.cpus);
1475 perf_cpu_map__put(evsel->core.own_cpus);
1476 perf_thread_map__put(evsel->core.threads);
1477 zfree(&evsel->group_name);
1478 zfree(&evsel->name);
1479 zfree(&evsel->filter);
1480 zfree(&evsel->pmu_name);
1481 zfree(&evsel->group_pmu_name);
1482 zfree(&evsel->unit);
1483 zfree(&evsel->metric_id);
1484 evsel__zero_per_pkg(evsel);
1485 hashmap__free(evsel->per_pkg_mask);
1486 evsel->per_pkg_mask = NULL;
1487 zfree(&evsel->metric_events);
1488 perf_evsel__object.fini(evsel);
1489 }
1490
evsel__delete(struct evsel * evsel)1491 void evsel__delete(struct evsel *evsel)
1492 {
1493 if (!evsel)
1494 return;
1495
1496 evsel__exit(evsel);
1497 free(evsel);
1498 }
1499
evsel__compute_deltas(struct evsel * evsel,int cpu_map_idx,int thread,struct perf_counts_values * count)1500 void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread,
1501 struct perf_counts_values *count)
1502 {
1503 struct perf_counts_values tmp;
1504
1505 if (!evsel->prev_raw_counts)
1506 return;
1507
1508 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
1509 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count;
1510
1511 count->val = count->val - tmp.val;
1512 count->ena = count->ena - tmp.ena;
1513 count->run = count->run - tmp.run;
1514 }
1515
evsel__read_one(struct evsel * evsel,int cpu_map_idx,int thread)1516 static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
1517 {
1518 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread);
1519
1520 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
1521 }
1522
evsel__set_count(struct evsel * counter,int cpu_map_idx,int thread,u64 val,u64 ena,u64 run,u64 lost)1523 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
1524 u64 val, u64 ena, u64 run, u64 lost)
1525 {
1526 struct perf_counts_values *count;
1527
1528 count = perf_counts(counter->counts, cpu_map_idx, thread);
1529
1530 count->val = val;
1531 count->ena = ena;
1532 count->run = run;
1533 count->lost = lost;
1534
1535 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1536 }
1537
evsel__process_group_data(struct evsel * leader,int cpu_map_idx,int thread,u64 * data)1538 static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data)
1539 {
1540 u64 read_format = leader->core.attr.read_format;
1541 struct sample_read_value *v;
1542 u64 nr, ena = 0, run = 0, lost = 0;
1543
1544 nr = *data++;
1545
1546 if (nr != (u64) leader->core.nr_members)
1547 return -EINVAL;
1548
1549 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1550 ena = *data++;
1551
1552 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1553 run = *data++;
1554
1555 v = (void *)data;
1556 sample_read_group__for_each(v, nr, read_format) {
1557 struct evsel *counter;
1558
1559 counter = evlist__id2evsel(leader->evlist, v->id);
1560 if (!counter)
1561 return -EINVAL;
1562
1563 if (read_format & PERF_FORMAT_LOST)
1564 lost = v->lost;
1565
1566 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);
1567 }
1568
1569 return 0;
1570 }
1571
evsel__read_group(struct evsel * leader,int cpu_map_idx,int thread)1572 static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread)
1573 {
1574 struct perf_stat_evsel *ps = leader->stats;
1575 u64 read_format = leader->core.attr.read_format;
1576 int size = perf_evsel__read_size(&leader->core);
1577 u64 *data = ps->group_data;
1578
1579 if (!(read_format & PERF_FORMAT_ID))
1580 return -EINVAL;
1581
1582 if (!evsel__is_group_leader(leader))
1583 return -EINVAL;
1584
1585 if (!data) {
1586 data = zalloc(size);
1587 if (!data)
1588 return -ENOMEM;
1589
1590 ps->group_data = data;
1591 }
1592
1593 if (FD(leader, cpu_map_idx, thread) < 0)
1594 return -EINVAL;
1595
1596 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0)
1597 return -errno;
1598
1599 return evsel__process_group_data(leader, cpu_map_idx, thread, data);
1600 }
1601
evsel__read_counter(struct evsel * evsel,int cpu_map_idx,int thread)1602 int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
1603 {
1604 u64 read_format = evsel->core.attr.read_format;
1605
1606 if (read_format & PERF_FORMAT_GROUP)
1607 return evsel__read_group(evsel, cpu_map_idx, thread);
1608
1609 return evsel__read_one(evsel, cpu_map_idx, thread);
1610 }
1611
__evsel__read_on_cpu(struct evsel * evsel,int cpu_map_idx,int thread,bool scale)1612 int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale)
1613 {
1614 struct perf_counts_values count;
1615 size_t nv = scale ? 3 : 1;
1616
1617 if (FD(evsel, cpu_map_idx, thread) < 0)
1618 return -EINVAL;
1619
1620 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
1621 return -ENOMEM;
1622
1623 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0)
1624 return -errno;
1625
1626 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count);
1627 perf_counts_values__scale(&count, scale, NULL);
1628 *perf_counts(evsel->counts, cpu_map_idx, thread) = count;
1629 return 0;
1630 }
1631
evsel__match_other_cpu(struct evsel * evsel,struct evsel * other,int cpu_map_idx)1632 static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
1633 int cpu_map_idx)
1634 {
1635 struct perf_cpu cpu;
1636
1637 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
1638 return perf_cpu_map__idx(other->core.cpus, cpu);
1639 }
1640
evsel__hybrid_group_cpu_map_idx(struct evsel * evsel,int cpu_map_idx)1641 static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx)
1642 {
1643 struct evsel *leader = evsel__leader(evsel);
1644
1645 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
1646 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
1647 return evsel__match_other_cpu(evsel, leader, cpu_map_idx);
1648 }
1649
1650 return cpu_map_idx;
1651 }
1652
get_group_fd(struct evsel * evsel,int cpu_map_idx,int thread)1653 static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread)
1654 {
1655 struct evsel *leader = evsel__leader(evsel);
1656 int fd;
1657
1658 if (evsel__is_group_leader(evsel))
1659 return -1;
1660
1661 /*
1662 * Leader must be already processed/open,
1663 * if not it's a bug.
1664 */
1665 BUG_ON(!leader->core.fd);
1666
1667 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx);
1668 if (cpu_map_idx == -1)
1669 return -1;
1670
1671 fd = FD(leader, cpu_map_idx, thread);
1672 BUG_ON(fd == -1 && !leader->skippable);
1673
1674 /*
1675 * When the leader has been skipped, return -2 to distinguish from no
1676 * group leader case.
1677 */
1678 return fd == -1 ? -2 : fd;
1679 }
1680
evsel__remove_fd(struct evsel * pos,int nr_cpus,int nr_threads,int thread_idx)1681 static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
1682 {
1683 for (int cpu = 0; cpu < nr_cpus; cpu++)
1684 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1685 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1686 }
1687
update_fds(struct evsel * evsel,int nr_cpus,int cpu_map_idx,int nr_threads,int thread_idx)1688 static int update_fds(struct evsel *evsel,
1689 int nr_cpus, int cpu_map_idx,
1690 int nr_threads, int thread_idx)
1691 {
1692 struct evsel *pos;
1693
1694 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads)
1695 return -EINVAL;
1696
1697 evlist__for_each_entry(evsel->evlist, pos) {
1698 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx;
1699
1700 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1701
1702 /*
1703 * Since fds for next evsel has not been created,
1704 * there is no need to iterate whole event list.
1705 */
1706 if (pos == evsel)
1707 break;
1708 }
1709 return 0;
1710 }
1711
evsel__ignore_missing_thread(struct evsel * evsel,int nr_cpus,int cpu_map_idx,struct perf_thread_map * threads,int thread,int err)1712 static bool evsel__ignore_missing_thread(struct evsel *evsel,
1713 int nr_cpus, int cpu_map_idx,
1714 struct perf_thread_map *threads,
1715 int thread, int err)
1716 {
1717 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1718
1719 if (!evsel->ignore_missing_thread)
1720 return false;
1721
1722 /* The system wide setup does not work with threads. */
1723 if (evsel->core.system_wide)
1724 return false;
1725
1726 /* The -ESRCH is perf event syscall errno for pid's not found. */
1727 if (err != -ESRCH)
1728 return false;
1729
1730 /* If there's only one thread, let it fail. */
1731 if (threads->nr == 1)
1732 return false;
1733
1734 /*
1735 * We should remove fd for missing_thread first
1736 * because thread_map__remove() will decrease threads->nr.
1737 */
1738 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread))
1739 return false;
1740
1741 if (thread_map__remove(threads, thread))
1742 return false;
1743
1744 pr_warning("WARNING: Ignored open failure for pid %d\n",
1745 ignore_pid);
1746 return true;
1747 }
1748
__open_attr__fprintf(FILE * fp,const char * name,const char * val,void * priv __maybe_unused)1749 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1750 void *priv __maybe_unused)
1751 {
1752 return fprintf(fp, " %-32s %s\n", name, val);
1753 }
1754
display_attr(struct perf_event_attr * attr)1755 static void display_attr(struct perf_event_attr *attr)
1756 {
1757 if (verbose >= 2 || debug_peo_args) {
1758 fprintf(stderr, "%.60s\n", graph_dotted_line);
1759 fprintf(stderr, "perf_event_attr:\n");
1760 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1761 fprintf(stderr, "%.60s\n", graph_dotted_line);
1762 }
1763 }
1764
evsel__precise_ip_fallback(struct evsel * evsel)1765 bool evsel__precise_ip_fallback(struct evsel *evsel)
1766 {
1767 /* Do not try less precise if not requested. */
1768 if (!evsel->precise_max)
1769 return false;
1770
1771 /*
1772 * We tried all the precise_ip values, and it's
1773 * still failing, so leave it to standard fallback.
1774 */
1775 if (!evsel->core.attr.precise_ip) {
1776 evsel->core.attr.precise_ip = evsel->precise_ip_original;
1777 return false;
1778 }
1779
1780 if (!evsel->precise_ip_original)
1781 evsel->precise_ip_original = evsel->core.attr.precise_ip;
1782
1783 evsel->core.attr.precise_ip--;
1784 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1785 display_attr(&evsel->core.attr);
1786 return true;
1787 }
1788
1789 static struct perf_cpu_map *empty_cpu_map;
1790 static struct perf_thread_map *empty_thread_map;
1791
__evsel__prepare_open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)1792 static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1793 struct perf_thread_map *threads)
1794 {
1795 int nthreads = perf_thread_map__nr(threads);
1796
1797 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1798 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1799 return -EINVAL;
1800
1801 if (cpus == NULL) {
1802 if (empty_cpu_map == NULL) {
1803 empty_cpu_map = perf_cpu_map__dummy_new();
1804 if (empty_cpu_map == NULL)
1805 return -ENOMEM;
1806 }
1807
1808 cpus = empty_cpu_map;
1809 }
1810
1811 if (threads == NULL) {
1812 if (empty_thread_map == NULL) {
1813 empty_thread_map = thread_map__new_by_tid(-1);
1814 if (empty_thread_map == NULL)
1815 return -ENOMEM;
1816 }
1817
1818 threads = empty_thread_map;
1819 }
1820
1821 if (evsel->core.fd == NULL &&
1822 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
1823 return -ENOMEM;
1824
1825 evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
1826 if (evsel->cgrp)
1827 evsel->open_flags |= PERF_FLAG_PID_CGROUP;
1828
1829 return 0;
1830 }
1831
evsel__disable_missing_features(struct evsel * evsel)1832 static void evsel__disable_missing_features(struct evsel *evsel)
1833 {
1834 if (perf_missing_features.read_lost)
1835 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
1836 if (perf_missing_features.weight_struct) {
1837 evsel__set_sample_bit(evsel, WEIGHT);
1838 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
1839 }
1840 if (perf_missing_features.clockid_wrong)
1841 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1842 if (perf_missing_features.clockid) {
1843 evsel->core.attr.use_clockid = 0;
1844 evsel->core.attr.clockid = 0;
1845 }
1846 if (perf_missing_features.cloexec)
1847 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1848 if (perf_missing_features.mmap2)
1849 evsel->core.attr.mmap2 = 0;
1850 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest)
1851 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1852 if (perf_missing_features.lbr_flags)
1853 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1854 PERF_SAMPLE_BRANCH_NO_CYCLES);
1855 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1856 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1857 if (perf_missing_features.ksymbol)
1858 evsel->core.attr.ksymbol = 0;
1859 if (perf_missing_features.bpf)
1860 evsel->core.attr.bpf_event = 0;
1861 if (perf_missing_features.branch_hw_idx)
1862 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1863 if (perf_missing_features.sample_id_all)
1864 evsel->core.attr.sample_id_all = 0;
1865 }
1866
evsel__prepare_open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)1867 int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1868 struct perf_thread_map *threads)
1869 {
1870 int err;
1871
1872 err = __evsel__prepare_open(evsel, cpus, threads);
1873 if (err)
1874 return err;
1875
1876 evsel__disable_missing_features(evsel);
1877
1878 return err;
1879 }
1880
evsel__detect_missing_features(struct evsel * evsel)1881 bool evsel__detect_missing_features(struct evsel *evsel)
1882 {
1883 /*
1884 * Must probe features in the order they were added to the
1885 * perf_event_attr interface.
1886 */
1887 if (!perf_missing_features.read_lost &&
1888 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) {
1889 perf_missing_features.read_lost = true;
1890 pr_debug2("switching off PERF_FORMAT_LOST support\n");
1891 return true;
1892 } else if (!perf_missing_features.weight_struct &&
1893 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) {
1894 perf_missing_features.weight_struct = true;
1895 pr_debug2("switching off weight struct support\n");
1896 return true;
1897 } else if (!perf_missing_features.code_page_size &&
1898 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) {
1899 perf_missing_features.code_page_size = true;
1900 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n");
1901 return false;
1902 } else if (!perf_missing_features.data_page_size &&
1903 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) {
1904 perf_missing_features.data_page_size = true;
1905 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n");
1906 return false;
1907 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1908 perf_missing_features.cgroup = true;
1909 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1910 return false;
1911 } else if (!perf_missing_features.branch_hw_idx &&
1912 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1913 perf_missing_features.branch_hw_idx = true;
1914 pr_debug2("switching off branch HW index support\n");
1915 return true;
1916 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1917 perf_missing_features.aux_output = true;
1918 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1919 return false;
1920 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1921 perf_missing_features.bpf = true;
1922 pr_debug2_peo("switching off bpf_event\n");
1923 return true;
1924 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1925 perf_missing_features.ksymbol = true;
1926 pr_debug2_peo("switching off ksymbol\n");
1927 return true;
1928 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1929 perf_missing_features.write_backward = true;
1930 pr_debug2_peo("switching off write_backward\n");
1931 return false;
1932 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1933 perf_missing_features.clockid_wrong = true;
1934 pr_debug2_peo("switching off clockid\n");
1935 return true;
1936 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1937 perf_missing_features.clockid = true;
1938 pr_debug2_peo("switching off use_clockid\n");
1939 return true;
1940 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) {
1941 perf_missing_features.cloexec = true;
1942 pr_debug2_peo("switching off cloexec flag\n");
1943 return true;
1944 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1945 perf_missing_features.mmap2 = true;
1946 pr_debug2_peo("switching off mmap2\n");
1947 return true;
1948 } else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) {
1949 if (evsel->pmu == NULL)
1950 evsel->pmu = evsel__find_pmu(evsel);
1951
1952 if (evsel->pmu)
1953 evsel->pmu->missing_features.exclude_guest = true;
1954 else {
1955 /* we cannot find PMU, disable attrs now */
1956 evsel->core.attr.exclude_host = false;
1957 evsel->core.attr.exclude_guest = false;
1958 }
1959
1960 if (evsel->exclude_GH) {
1961 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n");
1962 return false;
1963 }
1964 if (!perf_missing_features.exclude_guest) {
1965 perf_missing_features.exclude_guest = true;
1966 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1967 }
1968 return true;
1969 } else if (!perf_missing_features.sample_id_all) {
1970 perf_missing_features.sample_id_all = true;
1971 pr_debug2_peo("switching off sample_id_all\n");
1972 return true;
1973 } else if (!perf_missing_features.lbr_flags &&
1974 (evsel->core.attr.branch_sample_type &
1975 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1976 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1977 perf_missing_features.lbr_flags = true;
1978 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1979 return true;
1980 } else if (!perf_missing_features.group_read &&
1981 evsel->core.attr.inherit &&
1982 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1983 evsel__is_group_leader(evsel)) {
1984 perf_missing_features.group_read = true;
1985 pr_debug2_peo("switching off group read\n");
1986 return true;
1987 } else {
1988 return false;
1989 }
1990 }
1991
evsel__increase_rlimit(enum rlimit_action * set_rlimit)1992 bool evsel__increase_rlimit(enum rlimit_action *set_rlimit)
1993 {
1994 int old_errno;
1995 struct rlimit l;
1996
1997 if (*set_rlimit < INCREASED_MAX) {
1998 old_errno = errno;
1999
2000 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
2001 if (*set_rlimit == NO_CHANGE) {
2002 l.rlim_cur = l.rlim_max;
2003 } else {
2004 l.rlim_cur = l.rlim_max + 1000;
2005 l.rlim_max = l.rlim_cur;
2006 }
2007 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
2008 (*set_rlimit) += 1;
2009 errno = old_errno;
2010 return true;
2011 }
2012 }
2013 errno = old_errno;
2014 }
2015
2016 return false;
2017 }
2018
evsel__open_cpu(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads,int start_cpu_map_idx,int end_cpu_map_idx)2019 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
2020 struct perf_thread_map *threads,
2021 int start_cpu_map_idx, int end_cpu_map_idx)
2022 {
2023 int idx, thread, nthreads;
2024 int pid = -1, err, old_errno;
2025 enum rlimit_action set_rlimit = NO_CHANGE;
2026
2027 err = __evsel__prepare_open(evsel, cpus, threads);
2028 if (err)
2029 return err;
2030
2031 if (cpus == NULL)
2032 cpus = empty_cpu_map;
2033
2034 if (threads == NULL)
2035 threads = empty_thread_map;
2036
2037 nthreads = perf_thread_map__nr(threads);
2038
2039 if (evsel->cgrp)
2040 pid = evsel->cgrp->fd;
2041
2042 fallback_missing_features:
2043 evsel__disable_missing_features(evsel);
2044
2045 pr_debug3("Opening: %s\n", evsel__name(evsel));
2046 display_attr(&evsel->core.attr);
2047
2048 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
2049
2050 for (thread = 0; thread < nthreads; thread++) {
2051 int fd, group_fd;
2052 retry_open:
2053 if (thread >= nthreads)
2054 break;
2055
2056 if (!evsel->cgrp && !evsel->core.system_wide)
2057 pid = perf_thread_map__pid(threads, thread);
2058
2059 group_fd = get_group_fd(evsel, idx, thread);
2060
2061 if (group_fd == -2) {
2062 pr_debug("broken group leader for %s\n", evsel->name);
2063 err = -EINVAL;
2064 goto out_close;
2065 }
2066
2067 test_attr__ready();
2068
2069 /* Debug message used by test scripts */
2070 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
2071 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags);
2072
2073 fd = sys_perf_event_open(&evsel->core.attr, pid,
2074 perf_cpu_map__cpu(cpus, idx).cpu,
2075 group_fd, evsel->open_flags);
2076
2077 FD(evsel, idx, thread) = fd;
2078
2079 if (fd < 0) {
2080 err = -errno;
2081
2082 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
2083 err);
2084 goto try_fallback;
2085 }
2086
2087 bpf_counter__install_pe(evsel, idx, fd);
2088
2089 if (unlikely(test_attr__enabled)) {
2090 test_attr__open(&evsel->core.attr, pid,
2091 perf_cpu_map__cpu(cpus, idx),
2092 fd, group_fd, evsel->open_flags);
2093 }
2094
2095 /* Debug message used by test scripts */
2096 pr_debug2_peo(" = %d\n", fd);
2097
2098 if (evsel->bpf_fd >= 0) {
2099 int evt_fd = fd;
2100 int bpf_fd = evsel->bpf_fd;
2101
2102 err = ioctl(evt_fd,
2103 PERF_EVENT_IOC_SET_BPF,
2104 bpf_fd);
2105 if (err && errno != EEXIST) {
2106 pr_err("failed to attach bpf fd %d: %s\n",
2107 bpf_fd, strerror(errno));
2108 err = -EINVAL;
2109 goto out_close;
2110 }
2111 }
2112
2113 set_rlimit = NO_CHANGE;
2114
2115 /*
2116 * If we succeeded but had to kill clockid, fail and
2117 * have evsel__open_strerror() print us a nice error.
2118 */
2119 if (perf_missing_features.clockid ||
2120 perf_missing_features.clockid_wrong) {
2121 err = -EINVAL;
2122 goto out_close;
2123 }
2124 }
2125 }
2126
2127 return 0;
2128
2129 try_fallback:
2130 if (evsel__precise_ip_fallback(evsel))
2131 goto retry_open;
2132
2133 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus),
2134 idx, threads, thread, err)) {
2135 /* We just removed 1 thread, so lower the upper nthreads limit. */
2136 nthreads--;
2137
2138 /* ... and pretend like nothing have happened. */
2139 err = 0;
2140 goto retry_open;
2141 }
2142 /*
2143 * perf stat needs between 5 and 22 fds per CPU. When we run out
2144 * of them try to increase the limits.
2145 */
2146 if (err == -EMFILE && evsel__increase_rlimit(&set_rlimit))
2147 goto retry_open;
2148
2149 if (err != -EINVAL || idx > 0 || thread > 0)
2150 goto out_close;
2151
2152 if (evsel__detect_missing_features(evsel))
2153 goto fallback_missing_features;
2154 out_close:
2155 if (err)
2156 threads->err_thread = thread;
2157
2158 old_errno = errno;
2159 do {
2160 while (--thread >= 0) {
2161 if (FD(evsel, idx, thread) >= 0)
2162 close(FD(evsel, idx, thread));
2163 FD(evsel, idx, thread) = -1;
2164 }
2165 thread = nthreads;
2166 } while (--idx >= 0);
2167 errno = old_errno;
2168 return err;
2169 }
2170
evsel__open(struct evsel * evsel,struct perf_cpu_map * cpus,struct perf_thread_map * threads)2171 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
2172 struct perf_thread_map *threads)
2173 {
2174 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
2175 }
2176
evsel__close(struct evsel * evsel)2177 void evsel__close(struct evsel *evsel)
2178 {
2179 perf_evsel__close(&evsel->core);
2180 perf_evsel__free_id(&evsel->core);
2181 }
2182
evsel__open_per_cpu(struct evsel * evsel,struct perf_cpu_map * cpus,int cpu_map_idx)2183 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx)
2184 {
2185 if (cpu_map_idx == -1)
2186 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus));
2187
2188 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1);
2189 }
2190
evsel__open_per_thread(struct evsel * evsel,struct perf_thread_map * threads)2191 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2192 {
2193 return evsel__open(evsel, NULL, threads);
2194 }
2195
perf_evsel__parse_id_sample(const struct evsel * evsel,const union perf_event * event,struct perf_sample * sample)2196 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
2197 const union perf_event *event,
2198 struct perf_sample *sample)
2199 {
2200 u64 type = evsel->core.attr.sample_type;
2201 const __u64 *array = event->sample.array;
2202 bool swapped = evsel->needs_swap;
2203 union u64_swap u;
2204
2205 array += ((event->header.size -
2206 sizeof(event->header)) / sizeof(u64)) - 1;
2207
2208 if (type & PERF_SAMPLE_IDENTIFIER) {
2209 sample->id = *array;
2210 array--;
2211 }
2212
2213 if (type & PERF_SAMPLE_CPU) {
2214 u.val64 = *array;
2215 if (swapped) {
2216 /* undo swap of u64, then swap on individual u32s */
2217 u.val64 = bswap_64(u.val64);
2218 u.val32[0] = bswap_32(u.val32[0]);
2219 }
2220
2221 sample->cpu = u.val32[0];
2222 array--;
2223 }
2224
2225 if (type & PERF_SAMPLE_STREAM_ID) {
2226 sample->stream_id = *array;
2227 array--;
2228 }
2229
2230 if (type & PERF_SAMPLE_ID) {
2231 sample->id = *array;
2232 array--;
2233 }
2234
2235 if (type & PERF_SAMPLE_TIME) {
2236 sample->time = *array;
2237 array--;
2238 }
2239
2240 if (type & PERF_SAMPLE_TID) {
2241 u.val64 = *array;
2242 if (swapped) {
2243 /* undo swap of u64, then swap on individual u32s */
2244 u.val64 = bswap_64(u.val64);
2245 u.val32[0] = bswap_32(u.val32[0]);
2246 u.val32[1] = bswap_32(u.val32[1]);
2247 }
2248
2249 sample->pid = u.val32[0];
2250 sample->tid = u.val32[1];
2251 array--;
2252 }
2253
2254 return 0;
2255 }
2256
overflow(const void * endp,u16 max_size,const void * offset,u64 size)2257 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2258 u64 size)
2259 {
2260 return size > max_size || offset + size > endp;
2261 }
2262
2263 #define OVERFLOW_CHECK(offset, size, max_size) \
2264 do { \
2265 if (overflow(endp, (max_size), (offset), (size))) \
2266 return -EFAULT; \
2267 } while (0)
2268
2269 #define OVERFLOW_CHECK_u64(offset) \
2270 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2271
2272 static int
perf_event__check_size(union perf_event * event,unsigned int sample_size)2273 perf_event__check_size(union perf_event *event, unsigned int sample_size)
2274 {
2275 /*
2276 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2277 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2278 * check the format does not go past the end of the event.
2279 */
2280 if (sample_size + sizeof(event->header) > event->header.size)
2281 return -EFAULT;
2282
2283 return 0;
2284 }
2285
arch_perf_parse_sample_weight(struct perf_sample * data,const __u64 * array,u64 type __maybe_unused)2286 void __weak arch_perf_parse_sample_weight(struct perf_sample *data,
2287 const __u64 *array,
2288 u64 type __maybe_unused)
2289 {
2290 data->weight = *array;
2291 }
2292
evsel__bitfield_swap_branch_flags(u64 value)2293 u64 evsel__bitfield_swap_branch_flags(u64 value)
2294 {
2295 u64 new_val = 0;
2296
2297 /*
2298 * branch_flags
2299 * union {
2300 * u64 values;
2301 * struct {
2302 * mispred:1 //target mispredicted
2303 * predicted:1 //target predicted
2304 * in_tx:1 //in transaction
2305 * abort:1 //transaction abort
2306 * cycles:16 //cycle count to last branch
2307 * type:4 //branch type
2308 * spec:2 //branch speculation info
2309 * new_type:4 //additional branch type
2310 * priv:3 //privilege level
2311 * reserved:31
2312 * }
2313 * }
2314 *
2315 * Avoid bswap64() the entire branch_flag.value,
2316 * as it has variable bit-field sizes. Instead the
2317 * macro takes the bit-field position/size,
2318 * swaps it based on the host endianness.
2319 */
2320 if (host_is_bigendian()) {
2321 new_val = bitfield_swap(value, 0, 1);
2322 new_val |= bitfield_swap(value, 1, 1);
2323 new_val |= bitfield_swap(value, 2, 1);
2324 new_val |= bitfield_swap(value, 3, 1);
2325 new_val |= bitfield_swap(value, 4, 16);
2326 new_val |= bitfield_swap(value, 20, 4);
2327 new_val |= bitfield_swap(value, 24, 2);
2328 new_val |= bitfield_swap(value, 26, 4);
2329 new_val |= bitfield_swap(value, 30, 3);
2330 new_val |= bitfield_swap(value, 33, 31);
2331 } else {
2332 new_val = bitfield_swap(value, 63, 1);
2333 new_val |= bitfield_swap(value, 62, 1);
2334 new_val |= bitfield_swap(value, 61, 1);
2335 new_val |= bitfield_swap(value, 60, 1);
2336 new_val |= bitfield_swap(value, 44, 16);
2337 new_val |= bitfield_swap(value, 40, 4);
2338 new_val |= bitfield_swap(value, 38, 2);
2339 new_val |= bitfield_swap(value, 34, 4);
2340 new_val |= bitfield_swap(value, 31, 3);
2341 new_val |= bitfield_swap(value, 0, 31);
2342 }
2343
2344 return new_val;
2345 }
2346
evsel__parse_sample(struct evsel * evsel,union perf_event * event,struct perf_sample * data)2347 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
2348 struct perf_sample *data)
2349 {
2350 u64 type = evsel->core.attr.sample_type;
2351 bool swapped = evsel->needs_swap;
2352 const __u64 *array;
2353 u16 max_size = event->header.size;
2354 const void *endp = (void *)event + max_size;
2355 u64 sz;
2356
2357 /*
2358 * used for cross-endian analysis. See git commit 65014ab3
2359 * for why this goofiness is needed.
2360 */
2361 union u64_swap u;
2362
2363 memset(data, 0, sizeof(*data));
2364 data->cpu = data->pid = data->tid = -1;
2365 data->stream_id = data->id = data->time = -1ULL;
2366 data->period = evsel->core.attr.sample_period;
2367 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2368 data->misc = event->header.misc;
2369 data->data_src = PERF_MEM_DATA_SRC_NONE;
2370 data->vcpu = -1;
2371
2372 if (event->header.type != PERF_RECORD_SAMPLE) {
2373 if (!evsel->core.attr.sample_id_all)
2374 return 0;
2375 return perf_evsel__parse_id_sample(evsel, event, data);
2376 }
2377
2378 array = event->sample.array;
2379
2380 if (perf_event__check_size(event, evsel->sample_size))
2381 return -EFAULT;
2382
2383 if (type & PERF_SAMPLE_IDENTIFIER) {
2384 data->id = *array;
2385 array++;
2386 }
2387
2388 if (type & PERF_SAMPLE_IP) {
2389 data->ip = *array;
2390 array++;
2391 }
2392
2393 if (type & PERF_SAMPLE_TID) {
2394 u.val64 = *array;
2395 if (swapped) {
2396 /* undo swap of u64, then swap on individual u32s */
2397 u.val64 = bswap_64(u.val64);
2398 u.val32[0] = bswap_32(u.val32[0]);
2399 u.val32[1] = bswap_32(u.val32[1]);
2400 }
2401
2402 data->pid = u.val32[0];
2403 data->tid = u.val32[1];
2404 array++;
2405 }
2406
2407 if (type & PERF_SAMPLE_TIME) {
2408 data->time = *array;
2409 array++;
2410 }
2411
2412 if (type & PERF_SAMPLE_ADDR) {
2413 data->addr = *array;
2414 array++;
2415 }
2416
2417 if (type & PERF_SAMPLE_ID) {
2418 data->id = *array;
2419 array++;
2420 }
2421
2422 if (type & PERF_SAMPLE_STREAM_ID) {
2423 data->stream_id = *array;
2424 array++;
2425 }
2426
2427 if (type & PERF_SAMPLE_CPU) {
2428
2429 u.val64 = *array;
2430 if (swapped) {
2431 /* undo swap of u64, then swap on individual u32s */
2432 u.val64 = bswap_64(u.val64);
2433 u.val32[0] = bswap_32(u.val32[0]);
2434 }
2435
2436 data->cpu = u.val32[0];
2437 array++;
2438 }
2439
2440 if (type & PERF_SAMPLE_PERIOD) {
2441 data->period = *array;
2442 array++;
2443 }
2444
2445 if (type & PERF_SAMPLE_READ) {
2446 u64 read_format = evsel->core.attr.read_format;
2447
2448 OVERFLOW_CHECK_u64(array);
2449 if (read_format & PERF_FORMAT_GROUP)
2450 data->read.group.nr = *array;
2451 else
2452 data->read.one.value = *array;
2453
2454 array++;
2455
2456 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2457 OVERFLOW_CHECK_u64(array);
2458 data->read.time_enabled = *array;
2459 array++;
2460 }
2461
2462 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2463 OVERFLOW_CHECK_u64(array);
2464 data->read.time_running = *array;
2465 array++;
2466 }
2467
2468 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2469 if (read_format & PERF_FORMAT_GROUP) {
2470 const u64 max_group_nr = UINT64_MAX /
2471 sizeof(struct sample_read_value);
2472
2473 if (data->read.group.nr > max_group_nr)
2474 return -EFAULT;
2475
2476 sz = data->read.group.nr * sample_read_value_size(read_format);
2477 OVERFLOW_CHECK(array, sz, max_size);
2478 data->read.group.values =
2479 (struct sample_read_value *)array;
2480 array = (void *)array + sz;
2481 } else {
2482 OVERFLOW_CHECK_u64(array);
2483 data->read.one.id = *array;
2484 array++;
2485
2486 if (read_format & PERF_FORMAT_LOST) {
2487 OVERFLOW_CHECK_u64(array);
2488 data->read.one.lost = *array;
2489 array++;
2490 }
2491 }
2492 }
2493
2494 if (type & PERF_SAMPLE_CALLCHAIN) {
2495 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2496
2497 OVERFLOW_CHECK_u64(array);
2498 data->callchain = (struct ip_callchain *)array++;
2499 if (data->callchain->nr > max_callchain_nr)
2500 return -EFAULT;
2501 sz = data->callchain->nr * sizeof(u64);
2502 OVERFLOW_CHECK(array, sz, max_size);
2503 array = (void *)array + sz;
2504 }
2505
2506 if (type & PERF_SAMPLE_RAW) {
2507 OVERFLOW_CHECK_u64(array);
2508 u.val64 = *array;
2509
2510 /*
2511 * Undo swap of u64, then swap on individual u32s,
2512 * get the size of the raw area and undo all of the
2513 * swap. The pevent interface handles endianness by
2514 * itself.
2515 */
2516 if (swapped) {
2517 u.val64 = bswap_64(u.val64);
2518 u.val32[0] = bswap_32(u.val32[0]);
2519 u.val32[1] = bswap_32(u.val32[1]);
2520 }
2521 data->raw_size = u.val32[0];
2522
2523 /*
2524 * The raw data is aligned on 64bits including the
2525 * u32 size, so it's safe to use mem_bswap_64.
2526 */
2527 if (swapped)
2528 mem_bswap_64((void *) array, data->raw_size);
2529
2530 array = (void *)array + sizeof(u32);
2531
2532 OVERFLOW_CHECK(array, data->raw_size, max_size);
2533 data->raw_data = (void *)array;
2534 array = (void *)array + data->raw_size;
2535 }
2536
2537 if (type & PERF_SAMPLE_BRANCH_STACK) {
2538 const u64 max_branch_nr = UINT64_MAX /
2539 sizeof(struct branch_entry);
2540 struct branch_entry *e;
2541 unsigned int i;
2542
2543 OVERFLOW_CHECK_u64(array);
2544 data->branch_stack = (struct branch_stack *)array++;
2545
2546 if (data->branch_stack->nr > max_branch_nr)
2547 return -EFAULT;
2548
2549 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2550 if (evsel__has_branch_hw_idx(evsel)) {
2551 sz += sizeof(u64);
2552 e = &data->branch_stack->entries[0];
2553 } else {
2554 data->no_hw_idx = true;
2555 /*
2556 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied,
2557 * only nr and entries[] will be output by kernel.
2558 */
2559 e = (struct branch_entry *)&data->branch_stack->hw_idx;
2560 }
2561
2562 if (swapped) {
2563 /*
2564 * struct branch_flag does not have endian
2565 * specific bit field definition. And bswap
2566 * will not resolve the issue, since these
2567 * are bit fields.
2568 *
2569 * evsel__bitfield_swap_branch_flags() uses a
2570 * bitfield_swap macro to swap the bit position
2571 * based on the host endians.
2572 */
2573 for (i = 0; i < data->branch_stack->nr; i++, e++)
2574 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value);
2575 }
2576
2577 OVERFLOW_CHECK(array, sz, max_size);
2578 array = (void *)array + sz;
2579 }
2580
2581 if (type & PERF_SAMPLE_REGS_USER) {
2582 OVERFLOW_CHECK_u64(array);
2583 data->user_regs.abi = *array;
2584 array++;
2585
2586 if (data->user_regs.abi) {
2587 u64 mask = evsel->core.attr.sample_regs_user;
2588
2589 sz = hweight64(mask) * sizeof(u64);
2590 OVERFLOW_CHECK(array, sz, max_size);
2591 data->user_regs.mask = mask;
2592 data->user_regs.regs = (u64 *)array;
2593 array = (void *)array + sz;
2594 }
2595 }
2596
2597 if (type & PERF_SAMPLE_STACK_USER) {
2598 OVERFLOW_CHECK_u64(array);
2599 sz = *array++;
2600
2601 data->user_stack.offset = ((char *)(array - 1)
2602 - (char *) event);
2603
2604 if (!sz) {
2605 data->user_stack.size = 0;
2606 } else {
2607 OVERFLOW_CHECK(array, sz, max_size);
2608 data->user_stack.data = (char *)array;
2609 array = (void *)array + sz;
2610 OVERFLOW_CHECK_u64(array);
2611 data->user_stack.size = *array++;
2612 if (WARN_ONCE(data->user_stack.size > sz,
2613 "user stack dump failure\n"))
2614 return -EFAULT;
2615 }
2616 }
2617
2618 if (type & PERF_SAMPLE_WEIGHT_TYPE) {
2619 OVERFLOW_CHECK_u64(array);
2620 arch_perf_parse_sample_weight(data, array, type);
2621 array++;
2622 }
2623
2624 if (type & PERF_SAMPLE_DATA_SRC) {
2625 OVERFLOW_CHECK_u64(array);
2626 data->data_src = *array;
2627 array++;
2628 }
2629
2630 if (type & PERF_SAMPLE_TRANSACTION) {
2631 OVERFLOW_CHECK_u64(array);
2632 data->transaction = *array;
2633 array++;
2634 }
2635
2636 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2637 if (type & PERF_SAMPLE_REGS_INTR) {
2638 OVERFLOW_CHECK_u64(array);
2639 data->intr_regs.abi = *array;
2640 array++;
2641
2642 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2643 u64 mask = evsel->core.attr.sample_regs_intr;
2644
2645 sz = hweight64(mask) * sizeof(u64);
2646 OVERFLOW_CHECK(array, sz, max_size);
2647 data->intr_regs.mask = mask;
2648 data->intr_regs.regs = (u64 *)array;
2649 array = (void *)array + sz;
2650 }
2651 }
2652
2653 data->phys_addr = 0;
2654 if (type & PERF_SAMPLE_PHYS_ADDR) {
2655 data->phys_addr = *array;
2656 array++;
2657 }
2658
2659 data->cgroup = 0;
2660 if (type & PERF_SAMPLE_CGROUP) {
2661 data->cgroup = *array;
2662 array++;
2663 }
2664
2665 data->data_page_size = 0;
2666 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
2667 data->data_page_size = *array;
2668 array++;
2669 }
2670
2671 data->code_page_size = 0;
2672 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
2673 data->code_page_size = *array;
2674 array++;
2675 }
2676
2677 if (type & PERF_SAMPLE_AUX) {
2678 OVERFLOW_CHECK_u64(array);
2679 sz = *array++;
2680
2681 OVERFLOW_CHECK(array, sz, max_size);
2682 /* Undo swap of data */
2683 if (swapped)
2684 mem_bswap_64((char *)array, sz);
2685 data->aux_sample.size = sz;
2686 data->aux_sample.data = (char *)array;
2687 array = (void *)array + sz;
2688 }
2689
2690 return 0;
2691 }
2692
evsel__parse_sample_timestamp(struct evsel * evsel,union perf_event * event,u64 * timestamp)2693 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
2694 u64 *timestamp)
2695 {
2696 u64 type = evsel->core.attr.sample_type;
2697 const __u64 *array;
2698
2699 if (!(type & PERF_SAMPLE_TIME))
2700 return -1;
2701
2702 if (event->header.type != PERF_RECORD_SAMPLE) {
2703 struct perf_sample data = {
2704 .time = -1ULL,
2705 };
2706
2707 if (!evsel->core.attr.sample_id_all)
2708 return -1;
2709 if (perf_evsel__parse_id_sample(evsel, event, &data))
2710 return -1;
2711
2712 *timestamp = data.time;
2713 return 0;
2714 }
2715
2716 array = event->sample.array;
2717
2718 if (perf_event__check_size(event, evsel->sample_size))
2719 return -EFAULT;
2720
2721 if (type & PERF_SAMPLE_IDENTIFIER)
2722 array++;
2723
2724 if (type & PERF_SAMPLE_IP)
2725 array++;
2726
2727 if (type & PERF_SAMPLE_TID)
2728 array++;
2729
2730 if (type & PERF_SAMPLE_TIME)
2731 *timestamp = *array;
2732
2733 return 0;
2734 }
2735
evsel__id_hdr_size(struct evsel * evsel)2736 u16 evsel__id_hdr_size(struct evsel *evsel)
2737 {
2738 u64 sample_type = evsel->core.attr.sample_type;
2739 u16 size = 0;
2740
2741 if (sample_type & PERF_SAMPLE_TID)
2742 size += sizeof(u64);
2743
2744 if (sample_type & PERF_SAMPLE_TIME)
2745 size += sizeof(u64);
2746
2747 if (sample_type & PERF_SAMPLE_ID)
2748 size += sizeof(u64);
2749
2750 if (sample_type & PERF_SAMPLE_STREAM_ID)
2751 size += sizeof(u64);
2752
2753 if (sample_type & PERF_SAMPLE_CPU)
2754 size += sizeof(u64);
2755
2756 if (sample_type & PERF_SAMPLE_IDENTIFIER)
2757 size += sizeof(u64);
2758
2759 return size;
2760 }
2761
2762 #ifdef HAVE_LIBTRACEEVENT
evsel__field(struct evsel * evsel,const char * name)2763 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
2764 {
2765 return tep_find_field(evsel->tp_format, name);
2766 }
2767
evsel__rawptr(struct evsel * evsel,struct perf_sample * sample,const char * name)2768 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
2769 {
2770 struct tep_format_field *field = evsel__field(evsel, name);
2771 int offset;
2772
2773 if (!field)
2774 return NULL;
2775
2776 offset = field->offset;
2777
2778 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2779 offset = *(int *)(sample->raw_data + field->offset);
2780 offset &= 0xffff;
2781 if (tep_field_is_relative(field->flags))
2782 offset += field->offset + field->size;
2783 }
2784
2785 return sample->raw_data + offset;
2786 }
2787
format_field__intval(struct tep_format_field * field,struct perf_sample * sample,bool needs_swap)2788 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2789 bool needs_swap)
2790 {
2791 u64 value;
2792 void *ptr = sample->raw_data + field->offset;
2793
2794 switch (field->size) {
2795 case 1:
2796 return *(u8 *)ptr;
2797 case 2:
2798 value = *(u16 *)ptr;
2799 break;
2800 case 4:
2801 value = *(u32 *)ptr;
2802 break;
2803 case 8:
2804 memcpy(&value, ptr, sizeof(u64));
2805 break;
2806 default:
2807 return 0;
2808 }
2809
2810 if (!needs_swap)
2811 return value;
2812
2813 switch (field->size) {
2814 case 2:
2815 return bswap_16(value);
2816 case 4:
2817 return bswap_32(value);
2818 case 8:
2819 return bswap_64(value);
2820 default:
2821 return 0;
2822 }
2823
2824 return 0;
2825 }
2826
evsel__intval(struct evsel * evsel,struct perf_sample * sample,const char * name)2827 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
2828 {
2829 struct tep_format_field *field = evsel__field(evsel, name);
2830
2831 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2832 }
2833 #endif
2834
evsel__fallback(struct evsel * evsel,int err,char * msg,size_t msgsize)2835 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize)
2836 {
2837 int paranoid;
2838
2839 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2840 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2841 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2842 /*
2843 * If it's cycles then fall back to hrtimer based
2844 * cpu-clock-tick sw counter, which is always available even if
2845 * no PMU support.
2846 *
2847 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2848 * b0a873e).
2849 */
2850 scnprintf(msg, msgsize, "%s",
2851 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2852
2853 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2854 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2855
2856 zfree(&evsel->name);
2857 return true;
2858 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2859 (paranoid = perf_event_paranoid()) > 1) {
2860 const char *name = evsel__name(evsel);
2861 char *new_name;
2862 const char *sep = ":";
2863
2864 /* If event has exclude user then don't exclude kernel. */
2865 if (evsel->core.attr.exclude_user)
2866 return false;
2867
2868 /* Is there already the separator in the name. */
2869 if (strchr(name, '/') ||
2870 (strchr(name, ':') && !evsel->is_libpfm_event))
2871 sep = "";
2872
2873 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2874 return false;
2875
2876 free(evsel->name);
2877 evsel->name = new_name;
2878 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2879 "to fall back to excluding kernel and hypervisor "
2880 " samples", paranoid);
2881 evsel->core.attr.exclude_kernel = 1;
2882 evsel->core.attr.exclude_hv = 1;
2883
2884 return true;
2885 }
2886
2887 return false;
2888 }
2889
find_process(const char * name)2890 static bool find_process(const char *name)
2891 {
2892 size_t len = strlen(name);
2893 DIR *dir;
2894 struct dirent *d;
2895 int ret = -1;
2896
2897 dir = opendir(procfs__mountpoint());
2898 if (!dir)
2899 return false;
2900
2901 /* Walk through the directory. */
2902 while (ret && (d = readdir(dir)) != NULL) {
2903 char path[PATH_MAX];
2904 char *data;
2905 size_t size;
2906
2907 if ((d->d_type != DT_DIR) ||
2908 !strcmp(".", d->d_name) ||
2909 !strcmp("..", d->d_name))
2910 continue;
2911
2912 scnprintf(path, sizeof(path), "%s/%s/comm",
2913 procfs__mountpoint(), d->d_name);
2914
2915 if (filename__read_str(path, &data, &size))
2916 continue;
2917
2918 ret = strncmp(name, data, len);
2919 free(data);
2920 }
2921
2922 closedir(dir);
2923 return ret ? false : true;
2924 }
2925
arch_evsel__open_strerror(struct evsel * evsel __maybe_unused,char * msg __maybe_unused,size_t size __maybe_unused)2926 int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused,
2927 char *msg __maybe_unused,
2928 size_t size __maybe_unused)
2929 {
2930 return 0;
2931 }
2932
evsel__open_strerror(struct evsel * evsel,struct target * target,int err,char * msg,size_t size)2933 int evsel__open_strerror(struct evsel *evsel, struct target *target,
2934 int err, char *msg, size_t size)
2935 {
2936 char sbuf[STRERR_BUFSIZE];
2937 int printed = 0, enforced = 0;
2938 int ret;
2939
2940 switch (err) {
2941 case EPERM:
2942 case EACCES:
2943 printed += scnprintf(msg + printed, size - printed,
2944 "Access to performance monitoring and observability operations is limited.\n");
2945
2946 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
2947 if (enforced) {
2948 printed += scnprintf(msg + printed, size - printed,
2949 "Enforced MAC policy settings (SELinux) can limit access to performance\n"
2950 "monitoring and observability operations. Inspect system audit records for\n"
2951 "more perf_event access control information and adjusting the policy.\n");
2952 }
2953 }
2954
2955 if (err == EPERM)
2956 printed += scnprintf(msg, size,
2957 "No permission to enable %s event.\n\n", evsel__name(evsel));
2958
2959 return scnprintf(msg + printed, size - printed,
2960 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
2961 "access to performance monitoring and observability operations for processes\n"
2962 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
2963 "More information can be found at 'Perf events and tool security' document:\n"
2964 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
2965 "perf_event_paranoid setting is %d:\n"
2966 " -1: Allow use of (almost) all events by all users\n"
2967 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2968 ">= 0: Disallow raw and ftrace function tracepoint access\n"
2969 ">= 1: Disallow CPU event access\n"
2970 ">= 2: Disallow kernel profiling\n"
2971 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
2972 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
2973 perf_event_paranoid());
2974 case ENOENT:
2975 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
2976 case EMFILE:
2977 return scnprintf(msg, size, "%s",
2978 "Too many events are opened.\n"
2979 "Probably the maximum number of open file descriptors has been reached.\n"
2980 "Hint: Try again after reducing the number of events.\n"
2981 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2982 case ENOMEM:
2983 if (evsel__has_callchain(evsel) &&
2984 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2985 return scnprintf(msg, size,
2986 "Not enough memory to setup event with callchain.\n"
2987 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2988 "Hint: Current value: %d", sysctl__max_stack());
2989 break;
2990 case ENODEV:
2991 if (target->cpu_list)
2992 return scnprintf(msg, size, "%s",
2993 "No such device - did you specify an out-of-range profile CPU?");
2994 break;
2995 case EOPNOTSUPP:
2996 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)
2997 return scnprintf(msg, size,
2998 "%s: PMU Hardware or event type doesn't support branch stack sampling.",
2999 evsel__name(evsel));
3000 if (evsel->core.attr.aux_output)
3001 return scnprintf(msg, size,
3002 "%s: PMU Hardware doesn't support 'aux_output' feature",
3003 evsel__name(evsel));
3004 if (evsel->core.attr.sample_period != 0)
3005 return scnprintf(msg, size,
3006 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
3007 evsel__name(evsel));
3008 if (evsel->core.attr.precise_ip)
3009 return scnprintf(msg, size, "%s",
3010 "\'precise\' request may not be supported. Try removing 'p' modifier.");
3011 #if defined(__i386__) || defined(__x86_64__)
3012 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
3013 return scnprintf(msg, size, "%s",
3014 "No hardware sampling interrupt available.\n");
3015 #endif
3016 break;
3017 case EBUSY:
3018 if (find_process("oprofiled"))
3019 return scnprintf(msg, size,
3020 "The PMU counters are busy/taken by another profiler.\n"
3021 "We found oprofile daemon running, please stop it and try again.");
3022 break;
3023 case EINVAL:
3024 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
3025 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
3026 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
3027 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
3028 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
3029 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
3030 if (perf_missing_features.clockid)
3031 return scnprintf(msg, size, "clockid feature not supported.");
3032 if (perf_missing_features.clockid_wrong)
3033 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
3034 if (perf_missing_features.aux_output)
3035 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
3036 if (!target__has_cpu(target))
3037 return scnprintf(msg, size,
3038 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
3039 evsel__name(evsel));
3040
3041 break;
3042 case ENODATA:
3043 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
3044 "Please add an auxiliary event in front of the load latency event.");
3045 default:
3046 break;
3047 }
3048
3049 ret = arch_evsel__open_strerror(evsel, msg, size);
3050 if (ret)
3051 return ret;
3052
3053 return scnprintf(msg, size,
3054 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
3055 "/bin/dmesg | grep -i perf may provide additional information.\n",
3056 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
3057 }
3058
evsel__env(struct evsel * evsel)3059 struct perf_env *evsel__env(struct evsel *evsel)
3060 {
3061 if (evsel && evsel->evlist && evsel->evlist->env)
3062 return evsel->evlist->env;
3063 return &perf_env;
3064 }
3065
store_evsel_ids(struct evsel * evsel,struct evlist * evlist)3066 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
3067 {
3068 int cpu_map_idx, thread;
3069
3070 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
3071 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
3072 thread++) {
3073 int fd = FD(evsel, cpu_map_idx, thread);
3074
3075 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
3076 cpu_map_idx, thread, fd) < 0)
3077 return -1;
3078 }
3079 }
3080
3081 return 0;
3082 }
3083
evsel__store_ids(struct evsel * evsel,struct evlist * evlist)3084 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
3085 {
3086 struct perf_cpu_map *cpus = evsel->core.cpus;
3087 struct perf_thread_map *threads = evsel->core.threads;
3088
3089 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr))
3090 return -ENOMEM;
3091
3092 return store_evsel_ids(evsel, evlist);
3093 }
3094
evsel__zero_per_pkg(struct evsel * evsel)3095 void evsel__zero_per_pkg(struct evsel *evsel)
3096 {
3097 struct hashmap_entry *cur;
3098 size_t bkt;
3099
3100 if (evsel->per_pkg_mask) {
3101 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
3102 zfree(&cur->pkey);
3103
3104 hashmap__clear(evsel->per_pkg_mask);
3105 }
3106 }
3107
3108 /**
3109 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this
3110 * will be false on hybrid systems for hardware and legacy
3111 * cache events.
3112 */
evsel__is_hybrid(const struct evsel * evsel)3113 bool evsel__is_hybrid(const struct evsel *evsel)
3114 {
3115 if (perf_pmus__num_core_pmus() == 1)
3116 return false;
3117
3118 return evsel->core.is_pmu_core;
3119 }
3120
evsel__leader(const struct evsel * evsel)3121 struct evsel *evsel__leader(const struct evsel *evsel)
3122 {
3123 return container_of(evsel->core.leader, struct evsel, core);
3124 }
3125
evsel__has_leader(struct evsel * evsel,struct evsel * leader)3126 bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
3127 {
3128 return evsel->core.leader == &leader->core;
3129 }
3130
evsel__is_leader(struct evsel * evsel)3131 bool evsel__is_leader(struct evsel *evsel)
3132 {
3133 return evsel__has_leader(evsel, evsel);
3134 }
3135
evsel__set_leader(struct evsel * evsel,struct evsel * leader)3136 void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
3137 {
3138 evsel->core.leader = &leader->core;
3139 }
3140
evsel__source_count(const struct evsel * evsel)3141 int evsel__source_count(const struct evsel *evsel)
3142 {
3143 struct evsel *pos;
3144 int count = 0;
3145
3146 evlist__for_each_entry(evsel->evlist, pos) {
3147 if (pos->metric_leader == evsel)
3148 count++;
3149 }
3150 return count;
3151 }
3152
arch_evsel__must_be_in_group(const struct evsel * evsel __maybe_unused)3153 bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused)
3154 {
3155 return false;
3156 }
3157
3158 /*
3159 * Remove an event from a given group (leader).
3160 * Some events, e.g., perf metrics Topdown events,
3161 * must always be grouped. Ignore the events.
3162 */
evsel__remove_from_group(struct evsel * evsel,struct evsel * leader)3163 void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader)
3164 {
3165 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) {
3166 evsel__set_leader(evsel, evsel);
3167 evsel->core.nr_members = 0;
3168 leader->core.nr_members--;
3169 }
3170 }
3171