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Merge tag 'x86-fpu-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
[thirdparty/linux.git] / tools / perf / util / evsel.c
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 <traceevent/event-parse.h>
16 #include <linux/hw_breakpoint.h>
17 #include <linux/perf_event.h>
18 #include <linux/compiler.h>
19 #include <linux/err.h>
20 #include <linux/zalloc.h>
21 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/types.h>
24 #include <dirent.h>
25 #include <stdlib.h>
26 #include <perf/evsel.h>
27 #include "asm/bug.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 "../perf-sys.h"
49 #include "util/parse-branch-options.h"
50 #include <internal/xyarray.h>
51 #include <internal/lib.h>
52
53 #include <linux/ctype.h>
54
55 struct perf_missing_features perf_missing_features;
56
57 static clockid_t clockid;
58
59 static int perf_evsel__no_extra_init(struct evsel *evsel __maybe_unused)
60 {
61 return 0;
62 }
63
64 void __weak test_attr__ready(void) { }
65
66 static void perf_evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
67 {
68 }
69
70 static struct {
71 size_t size;
72 int (*init)(struct evsel *evsel);
73 void (*fini)(struct evsel *evsel);
74 } perf_evsel__object = {
75 .size = sizeof(struct evsel),
76 .init = perf_evsel__no_extra_init,
77 .fini = perf_evsel__no_extra_fini,
78 };
79
80 int perf_evsel__object_config(size_t object_size,
81 int (*init)(struct evsel *evsel),
82 void (*fini)(struct evsel *evsel))
83 {
84
85 if (object_size == 0)
86 goto set_methods;
87
88 if (perf_evsel__object.size > object_size)
89 return -EINVAL;
90
91 perf_evsel__object.size = object_size;
92
93 set_methods:
94 if (init != NULL)
95 perf_evsel__object.init = init;
96
97 if (fini != NULL)
98 perf_evsel__object.fini = fini;
99
100 return 0;
101 }
102
103 #define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
104
105 int __evsel__sample_size(u64 sample_type)
106 {
107 u64 mask = sample_type & PERF_SAMPLE_MASK;
108 int size = 0;
109 int i;
110
111 for (i = 0; i < 64; i++) {
112 if (mask & (1ULL << i))
113 size++;
114 }
115
116 size *= sizeof(u64);
117
118 return size;
119 }
120
121 /**
122 * __perf_evsel__calc_id_pos - calculate id_pos.
123 * @sample_type: sample type
124 *
125 * This function returns the position of the event id (PERF_SAMPLE_ID or
126 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
127 * perf_record_sample.
128 */
129 static int __perf_evsel__calc_id_pos(u64 sample_type)
130 {
131 int idx = 0;
132
133 if (sample_type & PERF_SAMPLE_IDENTIFIER)
134 return 0;
135
136 if (!(sample_type & PERF_SAMPLE_ID))
137 return -1;
138
139 if (sample_type & PERF_SAMPLE_IP)
140 idx += 1;
141
142 if (sample_type & PERF_SAMPLE_TID)
143 idx += 1;
144
145 if (sample_type & PERF_SAMPLE_TIME)
146 idx += 1;
147
148 if (sample_type & PERF_SAMPLE_ADDR)
149 idx += 1;
150
151 return idx;
152 }
153
154 /**
155 * __perf_evsel__calc_is_pos - calculate is_pos.
156 * @sample_type: sample type
157 *
158 * This function returns the position (counting backwards) of the event id
159 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
160 * sample_id_all is used there is an id sample appended to non-sample events.
161 */
162 static int __perf_evsel__calc_is_pos(u64 sample_type)
163 {
164 int idx = 1;
165
166 if (sample_type & PERF_SAMPLE_IDENTIFIER)
167 return 1;
168
169 if (!(sample_type & PERF_SAMPLE_ID))
170 return -1;
171
172 if (sample_type & PERF_SAMPLE_CPU)
173 idx += 1;
174
175 if (sample_type & PERF_SAMPLE_STREAM_ID)
176 idx += 1;
177
178 return idx;
179 }
180
181 void evsel__calc_id_pos(struct evsel *evsel)
182 {
183 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
184 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
185 }
186
187 void __evsel__set_sample_bit(struct evsel *evsel,
188 enum perf_event_sample_format bit)
189 {
190 if (!(evsel->core.attr.sample_type & bit)) {
191 evsel->core.attr.sample_type |= bit;
192 evsel->sample_size += sizeof(u64);
193 evsel__calc_id_pos(evsel);
194 }
195 }
196
197 void __evsel__reset_sample_bit(struct evsel *evsel,
198 enum perf_event_sample_format bit)
199 {
200 if (evsel->core.attr.sample_type & bit) {
201 evsel->core.attr.sample_type &= ~bit;
202 evsel->sample_size -= sizeof(u64);
203 evsel__calc_id_pos(evsel);
204 }
205 }
206
207 void evsel__set_sample_id(struct evsel *evsel,
208 bool can_sample_identifier)
209 {
210 if (can_sample_identifier) {
211 evsel__reset_sample_bit(evsel, ID);
212 evsel__set_sample_bit(evsel, IDENTIFIER);
213 } else {
214 evsel__set_sample_bit(evsel, ID);
215 }
216 evsel->core.attr.read_format |= PERF_FORMAT_ID;
217 }
218
219 /**
220 * evsel__is_function_event - Return whether given evsel is a function
221 * trace event
222 *
223 * @evsel - evsel selector to be tested
224 *
225 * Return %true if event is function trace event
226 */
227 bool evsel__is_function_event(struct evsel *evsel)
228 {
229 #define FUNCTION_EVENT "ftrace:function"
230
231 return evsel->name &&
232 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
233
234 #undef FUNCTION_EVENT
235 }
236
237 void evsel__init(struct evsel *evsel,
238 struct perf_event_attr *attr, int idx)
239 {
240 perf_evsel__init(&evsel->core, attr);
241 evsel->idx = idx;
242 evsel->tracking = !idx;
243 evsel->leader = evsel;
244 evsel->unit = "";
245 evsel->scale = 1.0;
246 evsel->max_events = ULONG_MAX;
247 evsel->evlist = NULL;
248 evsel->bpf_obj = NULL;
249 evsel->bpf_fd = -1;
250 INIT_LIST_HEAD(&evsel->config_terms);
251 perf_evsel__object.init(evsel);
252 evsel->sample_size = __evsel__sample_size(attr->sample_type);
253 evsel__calc_id_pos(evsel);
254 evsel->cmdline_group_boundary = false;
255 evsel->metric_expr = NULL;
256 evsel->metric_name = NULL;
257 evsel->metric_events = NULL;
258 evsel->collect_stat = false;
259 evsel->pmu_name = NULL;
260 }
261
262 struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
263 {
264 struct evsel *evsel = zalloc(perf_evsel__object.size);
265
266 if (!evsel)
267 return NULL;
268 evsel__init(evsel, attr, idx);
269
270 if (evsel__is_bpf_output(evsel)) {
271 evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
272 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
273 evsel->core.attr.sample_period = 1;
274 }
275
276 if (evsel__is_clock(evsel)) {
277 /*
278 * The evsel->unit points to static alias->unit
279 * so it's ok to use static string in here.
280 */
281 static const char *unit = "msec";
282
283 evsel->unit = unit;
284 evsel->scale = 1e-6;
285 }
286
287 return evsel;
288 }
289
290 static bool perf_event_can_profile_kernel(void)
291 {
292 return perf_event_paranoid_check(1);
293 }
294
295 struct evsel *perf_evsel__new_cycles(bool precise)
296 {
297 struct perf_event_attr attr = {
298 .type = PERF_TYPE_HARDWARE,
299 .config = PERF_COUNT_HW_CPU_CYCLES,
300 .exclude_kernel = !perf_event_can_profile_kernel(),
301 };
302 struct evsel *evsel;
303
304 event_attr_init(&attr);
305
306 if (!precise)
307 goto new_event;
308
309 /*
310 * Now let the usual logic to set up the perf_event_attr defaults
311 * to kick in when we return and before perf_evsel__open() is called.
312 */
313 new_event:
314 evsel = evsel__new(&attr);
315 if (evsel == NULL)
316 goto out;
317
318 evsel->precise_max = true;
319
320 /* use asprintf() because free(evsel) assumes name is allocated */
321 if (asprintf(&evsel->name, "cycles%s%s%.*s",
322 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
323 attr.exclude_kernel ? "u" : "",
324 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
325 goto error_free;
326 out:
327 return evsel;
328 error_free:
329 evsel__delete(evsel);
330 evsel = NULL;
331 goto out;
332 }
333
334 /*
335 * Returns pointer with encoded error via <linux/err.h> interface.
336 */
337 struct evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
338 {
339 struct evsel *evsel = zalloc(perf_evsel__object.size);
340 int err = -ENOMEM;
341
342 if (evsel == NULL) {
343 goto out_err;
344 } else {
345 struct perf_event_attr attr = {
346 .type = PERF_TYPE_TRACEPOINT,
347 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
348 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
349 };
350
351 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
352 goto out_free;
353
354 evsel->tp_format = trace_event__tp_format(sys, name);
355 if (IS_ERR(evsel->tp_format)) {
356 err = PTR_ERR(evsel->tp_format);
357 goto out_free;
358 }
359
360 event_attr_init(&attr);
361 attr.config = evsel->tp_format->id;
362 attr.sample_period = 1;
363 evsel__init(evsel, &attr, idx);
364 }
365
366 return evsel;
367
368 out_free:
369 zfree(&evsel->name);
370 free(evsel);
371 out_err:
372 return ERR_PTR(err);
373 }
374
375 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
376 "cycles",
377 "instructions",
378 "cache-references",
379 "cache-misses",
380 "branches",
381 "branch-misses",
382 "bus-cycles",
383 "stalled-cycles-frontend",
384 "stalled-cycles-backend",
385 "ref-cycles",
386 };
387
388 static const char *__evsel__hw_name(u64 config)
389 {
390 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
391 return perf_evsel__hw_names[config];
392
393 return "unknown-hardware";
394 }
395
396 static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
397 {
398 int colon = 0, r = 0;
399 struct perf_event_attr *attr = &evsel->core.attr;
400 bool exclude_guest_default = false;
401
402 #define MOD_PRINT(context, mod) do { \
403 if (!attr->exclude_##context) { \
404 if (!colon) colon = ++r; \
405 r += scnprintf(bf + r, size - r, "%c", mod); \
406 } } while(0)
407
408 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
409 MOD_PRINT(kernel, 'k');
410 MOD_PRINT(user, 'u');
411 MOD_PRINT(hv, 'h');
412 exclude_guest_default = true;
413 }
414
415 if (attr->precise_ip) {
416 if (!colon)
417 colon = ++r;
418 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
419 exclude_guest_default = true;
420 }
421
422 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
423 MOD_PRINT(host, 'H');
424 MOD_PRINT(guest, 'G');
425 }
426 #undef MOD_PRINT
427 if (colon)
428 bf[colon - 1] = ':';
429 return r;
430 }
431
432 static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
433 {
434 int r = scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
435 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
436 }
437
438 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
439 "cpu-clock",
440 "task-clock",
441 "page-faults",
442 "context-switches",
443 "cpu-migrations",
444 "minor-faults",
445 "major-faults",
446 "alignment-faults",
447 "emulation-faults",
448 "dummy",
449 };
450
451 static const char *__evsel__sw_name(u64 config)
452 {
453 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
454 return perf_evsel__sw_names[config];
455 return "unknown-software";
456 }
457
458 static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
459 {
460 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
462 }
463
464 static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
465 {
466 int r;
467
468 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
469
470 if (type & HW_BREAKPOINT_R)
471 r += scnprintf(bf + r, size - r, "r");
472
473 if (type & HW_BREAKPOINT_W)
474 r += scnprintf(bf + r, size - r, "w");
475
476 if (type & HW_BREAKPOINT_X)
477 r += scnprintf(bf + r, size - r, "x");
478
479 return r;
480 }
481
482 static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
483 {
484 struct perf_event_attr *attr = &evsel->core.attr;
485 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
486 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
487 }
488
489 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
490 [PERF_EVSEL__MAX_ALIASES] = {
491 { "L1-dcache", "l1-d", "l1d", "L1-data", },
492 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
493 { "LLC", "L2", },
494 { "dTLB", "d-tlb", "Data-TLB", },
495 { "iTLB", "i-tlb", "Instruction-TLB", },
496 { "branch", "branches", "bpu", "btb", "bpc", },
497 { "node", },
498 };
499
500 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
501 [PERF_EVSEL__MAX_ALIASES] = {
502 { "load", "loads", "read", },
503 { "store", "stores", "write", },
504 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
505 };
506
507 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
508 [PERF_EVSEL__MAX_ALIASES] = {
509 { "refs", "Reference", "ops", "access", },
510 { "misses", "miss", },
511 };
512
513 #define C(x) PERF_COUNT_HW_CACHE_##x
514 #define CACHE_READ (1 << C(OP_READ))
515 #define CACHE_WRITE (1 << C(OP_WRITE))
516 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
517 #define COP(x) (1 << x)
518
519 /*
520 * cache operartion stat
521 * L1I : Read and prefetch only
522 * ITLB and BPU : Read-only
523 */
524 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
525 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
526 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
527 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
528 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
529 [C(ITLB)] = (CACHE_READ),
530 [C(BPU)] = (CACHE_READ),
531 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
532 };
533
534 bool evsel__is_cache_op_valid(u8 type, u8 op)
535 {
536 if (perf_evsel__hw_cache_stat[type] & COP(op))
537 return true; /* valid */
538 else
539 return false; /* invalid */
540 }
541
542 int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
543 {
544 if (result) {
545 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
546 perf_evsel__hw_cache_op[op][0],
547 perf_evsel__hw_cache_result[result][0]);
548 }
549
550 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
551 perf_evsel__hw_cache_op[op][1]);
552 }
553
554 static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
555 {
556 u8 op, result, type = (config >> 0) & 0xff;
557 const char *err = "unknown-ext-hardware-cache-type";
558
559 if (type >= PERF_COUNT_HW_CACHE_MAX)
560 goto out_err;
561
562 op = (config >> 8) & 0xff;
563 err = "unknown-ext-hardware-cache-op";
564 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
565 goto out_err;
566
567 result = (config >> 16) & 0xff;
568 err = "unknown-ext-hardware-cache-result";
569 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
570 goto out_err;
571
572 err = "invalid-cache";
573 if (!evsel__is_cache_op_valid(type, op))
574 goto out_err;
575
576 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
577 out_err:
578 return scnprintf(bf, size, "%s", err);
579 }
580
581 static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
582 {
583 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
584 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
585 }
586
587 static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
588 {
589 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
590 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
591 }
592
593 static int evsel__tool_name(char *bf, size_t size)
594 {
595 int ret = scnprintf(bf, size, "duration_time");
596 return ret;
597 }
598
599 const char *evsel__name(struct evsel *evsel)
600 {
601 char bf[128];
602
603 if (!evsel)
604 goto out_unknown;
605
606 if (evsel->name)
607 return evsel->name;
608
609 switch (evsel->core.attr.type) {
610 case PERF_TYPE_RAW:
611 evsel__raw_name(evsel, bf, sizeof(bf));
612 break;
613
614 case PERF_TYPE_HARDWARE:
615 evsel__hw_name(evsel, bf, sizeof(bf));
616 break;
617
618 case PERF_TYPE_HW_CACHE:
619 evsel__hw_cache_name(evsel, bf, sizeof(bf));
620 break;
621
622 case PERF_TYPE_SOFTWARE:
623 if (evsel->tool_event)
624 evsel__tool_name(bf, sizeof(bf));
625 else
626 evsel__sw_name(evsel, bf, sizeof(bf));
627 break;
628
629 case PERF_TYPE_TRACEPOINT:
630 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
631 break;
632
633 case PERF_TYPE_BREAKPOINT:
634 evsel__bp_name(evsel, bf, sizeof(bf));
635 break;
636
637 default:
638 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
639 evsel->core.attr.type);
640 break;
641 }
642
643 evsel->name = strdup(bf);
644
645 if (evsel->name)
646 return evsel->name;
647 out_unknown:
648 return "unknown";
649 }
650
651 const char *evsel__group_name(struct evsel *evsel)
652 {
653 return evsel->group_name ?: "anon group";
654 }
655
656 /*
657 * Returns the group details for the specified leader,
658 * with following rules.
659 *
660 * For record -e '{cycles,instructions}'
661 * 'anon group { cycles:u, instructions:u }'
662 *
663 * For record -e 'cycles,instructions' and report --group
664 * 'cycles:u, instructions:u'
665 */
666 int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
667 {
668 int ret = 0;
669 struct evsel *pos;
670 const char *group_name = evsel__group_name(evsel);
671
672 if (!evsel->forced_leader)
673 ret = scnprintf(buf, size, "%s { ", group_name);
674
675 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel));
676
677 for_each_group_member(pos, evsel)
678 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos));
679
680 if (!evsel->forced_leader)
681 ret += scnprintf(buf + ret, size - ret, " }");
682
683 return ret;
684 }
685
686 static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
687 struct callchain_param *param)
688 {
689 bool function = evsel__is_function_event(evsel);
690 struct perf_event_attr *attr = &evsel->core.attr;
691
692 evsel__set_sample_bit(evsel, CALLCHAIN);
693
694 attr->sample_max_stack = param->max_stack;
695
696 if (opts->kernel_callchains)
697 attr->exclude_callchain_user = 1;
698 if (opts->user_callchains)
699 attr->exclude_callchain_kernel = 1;
700 if (param->record_mode == CALLCHAIN_LBR) {
701 if (!opts->branch_stack) {
702 if (attr->exclude_user) {
703 pr_warning("LBR callstack option is only available "
704 "to get user callchain information. "
705 "Falling back to framepointers.\n");
706 } else {
707 evsel__set_sample_bit(evsel, BRANCH_STACK);
708 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
709 PERF_SAMPLE_BRANCH_CALL_STACK |
710 PERF_SAMPLE_BRANCH_NO_CYCLES |
711 PERF_SAMPLE_BRANCH_NO_FLAGS |
712 PERF_SAMPLE_BRANCH_HW_INDEX;
713 }
714 } else
715 pr_warning("Cannot use LBR callstack with branch stack. "
716 "Falling back to framepointers.\n");
717 }
718
719 if (param->record_mode == CALLCHAIN_DWARF) {
720 if (!function) {
721 evsel__set_sample_bit(evsel, REGS_USER);
722 evsel__set_sample_bit(evsel, STACK_USER);
723 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
724 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
725 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
726 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
727 "so the minimal registers set (IP, SP) is explicitly forced.\n");
728 } else {
729 attr->sample_regs_user |= PERF_REGS_MASK;
730 }
731 attr->sample_stack_user = param->dump_size;
732 attr->exclude_callchain_user = 1;
733 } else {
734 pr_info("Cannot use DWARF unwind for function trace event,"
735 " falling back to framepointers.\n");
736 }
737 }
738
739 if (function) {
740 pr_info("Disabling user space callchains for function trace event.\n");
741 attr->exclude_callchain_user = 1;
742 }
743 }
744
745 void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
746 struct callchain_param *param)
747 {
748 if (param->enabled)
749 return __evsel__config_callchain(evsel, opts, param);
750 }
751
752 static void
753 perf_evsel__reset_callgraph(struct evsel *evsel,
754 struct callchain_param *param)
755 {
756 struct perf_event_attr *attr = &evsel->core.attr;
757
758 evsel__reset_sample_bit(evsel, CALLCHAIN);
759 if (param->record_mode == CALLCHAIN_LBR) {
760 evsel__reset_sample_bit(evsel, BRANCH_STACK);
761 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
762 PERF_SAMPLE_BRANCH_CALL_STACK |
763 PERF_SAMPLE_BRANCH_HW_INDEX);
764 }
765 if (param->record_mode == CALLCHAIN_DWARF) {
766 evsel__reset_sample_bit(evsel, REGS_USER);
767 evsel__reset_sample_bit(evsel, STACK_USER);
768 }
769 }
770
771 static void apply_config_terms(struct evsel *evsel,
772 struct record_opts *opts, bool track)
773 {
774 struct perf_evsel_config_term *term;
775 struct list_head *config_terms = &evsel->config_terms;
776 struct perf_event_attr *attr = &evsel->core.attr;
777 /* callgraph default */
778 struct callchain_param param = {
779 .record_mode = callchain_param.record_mode,
780 };
781 u32 dump_size = 0;
782 int max_stack = 0;
783 const char *callgraph_buf = NULL;
784
785 list_for_each_entry(term, config_terms, list) {
786 switch (term->type) {
787 case PERF_EVSEL__CONFIG_TERM_PERIOD:
788 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
789 attr->sample_period = term->val.period;
790 attr->freq = 0;
791 evsel__reset_sample_bit(evsel, PERIOD);
792 }
793 break;
794 case PERF_EVSEL__CONFIG_TERM_FREQ:
795 if (!(term->weak && opts->user_freq != UINT_MAX)) {
796 attr->sample_freq = term->val.freq;
797 attr->freq = 1;
798 evsel__set_sample_bit(evsel, PERIOD);
799 }
800 break;
801 case PERF_EVSEL__CONFIG_TERM_TIME:
802 if (term->val.time)
803 evsel__set_sample_bit(evsel, TIME);
804 else
805 evsel__reset_sample_bit(evsel, TIME);
806 break;
807 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
808 callgraph_buf = term->val.str;
809 break;
810 case PERF_EVSEL__CONFIG_TERM_BRANCH:
811 if (term->val.str && strcmp(term->val.str, "no")) {
812 evsel__set_sample_bit(evsel, BRANCH_STACK);
813 parse_branch_str(term->val.str,
814 &attr->branch_sample_type);
815 } else
816 evsel__reset_sample_bit(evsel, BRANCH_STACK);
817 break;
818 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
819 dump_size = term->val.stack_user;
820 break;
821 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
822 max_stack = term->val.max_stack;
823 break;
824 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
825 evsel->max_events = term->val.max_events;
826 break;
827 case PERF_EVSEL__CONFIG_TERM_INHERIT:
828 /*
829 * attr->inherit should has already been set by
830 * evsel__config. If user explicitly set
831 * inherit using config terms, override global
832 * opt->no_inherit setting.
833 */
834 attr->inherit = term->val.inherit ? 1 : 0;
835 break;
836 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
837 attr->write_backward = term->val.overwrite ? 1 : 0;
838 break;
839 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
840 break;
841 case PERF_EVSEL__CONFIG_TERM_PERCORE:
842 break;
843 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
844 attr->aux_output = term->val.aux_output ? 1 : 0;
845 break;
846 case PERF_EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
847 /* Already applied by auxtrace */
848 break;
849 case PERF_EVSEL__CONFIG_TERM_CFG_CHG:
850 break;
851 default:
852 break;
853 }
854 }
855
856 /* User explicitly set per-event callgraph, clear the old setting and reset. */
857 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
858 bool sample_address = false;
859
860 if (max_stack) {
861 param.max_stack = max_stack;
862 if (callgraph_buf == NULL)
863 callgraph_buf = "fp";
864 }
865
866 /* parse callgraph parameters */
867 if (callgraph_buf != NULL) {
868 if (!strcmp(callgraph_buf, "no")) {
869 param.enabled = false;
870 param.record_mode = CALLCHAIN_NONE;
871 } else {
872 param.enabled = true;
873 if (parse_callchain_record(callgraph_buf, &param)) {
874 pr_err("per-event callgraph setting for %s failed. "
875 "Apply callgraph global setting for it\n",
876 evsel->name);
877 return;
878 }
879 if (param.record_mode == CALLCHAIN_DWARF)
880 sample_address = true;
881 }
882 }
883 if (dump_size > 0) {
884 dump_size = round_up(dump_size, sizeof(u64));
885 param.dump_size = dump_size;
886 }
887
888 /* If global callgraph set, clear it */
889 if (callchain_param.enabled)
890 perf_evsel__reset_callgraph(evsel, &callchain_param);
891
892 /* set perf-event callgraph */
893 if (param.enabled) {
894 if (sample_address) {
895 evsel__set_sample_bit(evsel, ADDR);
896 evsel__set_sample_bit(evsel, DATA_SRC);
897 evsel->core.attr.mmap_data = track;
898 }
899 evsel__config_callchain(evsel, opts, &param);
900 }
901 }
902 }
903
904 static bool is_dummy_event(struct evsel *evsel)
905 {
906 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
907 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
908 }
909
910 struct perf_evsel_config_term *__perf_evsel__get_config_term(struct evsel *evsel,
911 enum evsel_term_type type)
912 {
913 struct perf_evsel_config_term *term, *found_term = NULL;
914
915 list_for_each_entry(term, &evsel->config_terms, list) {
916 if (term->type == type)
917 found_term = term;
918 }
919
920 return found_term;
921 }
922
923 /*
924 * The enable_on_exec/disabled value strategy:
925 *
926 * 1) For any type of traced program:
927 * - all independent events and group leaders are disabled
928 * - all group members are enabled
929 *
930 * Group members are ruled by group leaders. They need to
931 * be enabled, because the group scheduling relies on that.
932 *
933 * 2) For traced programs executed by perf:
934 * - all independent events and group leaders have
935 * enable_on_exec set
936 * - we don't specifically enable or disable any event during
937 * the record command
938 *
939 * Independent events and group leaders are initially disabled
940 * and get enabled by exec. Group members are ruled by group
941 * leaders as stated in 1).
942 *
943 * 3) For traced programs attached by perf (pid/tid):
944 * - we specifically enable or disable all events during
945 * the record command
946 *
947 * When attaching events to already running traced we
948 * enable/disable events specifically, as there's no
949 * initial traced exec call.
950 */
951 void evsel__config(struct evsel *evsel, struct record_opts *opts,
952 struct callchain_param *callchain)
953 {
954 struct evsel *leader = evsel->leader;
955 struct perf_event_attr *attr = &evsel->core.attr;
956 int track = evsel->tracking;
957 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
958
959 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
960 attr->inherit = !opts->no_inherit;
961 attr->write_backward = opts->overwrite ? 1 : 0;
962
963 evsel__set_sample_bit(evsel, IP);
964 evsel__set_sample_bit(evsel, TID);
965
966 if (evsel->sample_read) {
967 evsel__set_sample_bit(evsel, READ);
968
969 /*
970 * We need ID even in case of single event, because
971 * PERF_SAMPLE_READ process ID specific data.
972 */
973 evsel__set_sample_id(evsel, false);
974
975 /*
976 * Apply group format only if we belong to group
977 * with more than one members.
978 */
979 if (leader->core.nr_members > 1) {
980 attr->read_format |= PERF_FORMAT_GROUP;
981 attr->inherit = 0;
982 }
983 }
984
985 /*
986 * We default some events to have a default interval. But keep
987 * it a weak assumption overridable by the user.
988 */
989 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
990 opts->user_interval != ULLONG_MAX)) {
991 if (opts->freq) {
992 evsel__set_sample_bit(evsel, PERIOD);
993 attr->freq = 1;
994 attr->sample_freq = opts->freq;
995 } else {
996 attr->sample_period = opts->default_interval;
997 }
998 }
999
1000 if (opts->no_samples)
1001 attr->sample_freq = 0;
1002
1003 if (opts->inherit_stat) {
1004 evsel->core.attr.read_format |=
1005 PERF_FORMAT_TOTAL_TIME_ENABLED |
1006 PERF_FORMAT_TOTAL_TIME_RUNNING |
1007 PERF_FORMAT_ID;
1008 attr->inherit_stat = 1;
1009 }
1010
1011 if (opts->sample_address) {
1012 evsel__set_sample_bit(evsel, ADDR);
1013 attr->mmap_data = track;
1014 }
1015
1016 /*
1017 * We don't allow user space callchains for function trace
1018 * event, due to issues with page faults while tracing page
1019 * fault handler and its overall trickiness nature.
1020 */
1021 if (evsel__is_function_event(evsel))
1022 evsel->core.attr.exclude_callchain_user = 1;
1023
1024 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1025 evsel__config_callchain(evsel, opts, callchain);
1026
1027 if (opts->sample_intr_regs) {
1028 attr->sample_regs_intr = opts->sample_intr_regs;
1029 evsel__set_sample_bit(evsel, REGS_INTR);
1030 }
1031
1032 if (opts->sample_user_regs) {
1033 attr->sample_regs_user |= opts->sample_user_regs;
1034 evsel__set_sample_bit(evsel, REGS_USER);
1035 }
1036
1037 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1038 evsel__set_sample_bit(evsel, CPU);
1039
1040 /*
1041 * When the user explicitly disabled time don't force it here.
1042 */
1043 if (opts->sample_time &&
1044 (!perf_missing_features.sample_id_all &&
1045 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1046 opts->sample_time_set)))
1047 evsel__set_sample_bit(evsel, TIME);
1048
1049 if (opts->raw_samples && !evsel->no_aux_samples) {
1050 evsel__set_sample_bit(evsel, TIME);
1051 evsel__set_sample_bit(evsel, RAW);
1052 evsel__set_sample_bit(evsel, CPU);
1053 }
1054
1055 if (opts->sample_address)
1056 evsel__set_sample_bit(evsel, DATA_SRC);
1057
1058 if (opts->sample_phys_addr)
1059 evsel__set_sample_bit(evsel, PHYS_ADDR);
1060
1061 if (opts->no_buffering) {
1062 attr->watermark = 0;
1063 attr->wakeup_events = 1;
1064 }
1065 if (opts->branch_stack && !evsel->no_aux_samples) {
1066 evsel__set_sample_bit(evsel, BRANCH_STACK);
1067 attr->branch_sample_type = opts->branch_stack;
1068 }
1069
1070 if (opts->sample_weight)
1071 evsel__set_sample_bit(evsel, WEIGHT);
1072
1073 attr->task = track;
1074 attr->mmap = track;
1075 attr->mmap2 = track && !perf_missing_features.mmap2;
1076 attr->comm = track;
1077 attr->ksymbol = track && !perf_missing_features.ksymbol;
1078 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1079
1080 if (opts->record_namespaces)
1081 attr->namespaces = track;
1082
1083 if (opts->record_cgroup) {
1084 attr->cgroup = track && !perf_missing_features.cgroup;
1085 evsel__set_sample_bit(evsel, CGROUP);
1086 }
1087
1088 if (opts->record_switch_events)
1089 attr->context_switch = track;
1090
1091 if (opts->sample_transaction)
1092 evsel__set_sample_bit(evsel, TRANSACTION);
1093
1094 if (opts->running_time) {
1095 evsel->core.attr.read_format |=
1096 PERF_FORMAT_TOTAL_TIME_ENABLED |
1097 PERF_FORMAT_TOTAL_TIME_RUNNING;
1098 }
1099
1100 /*
1101 * XXX see the function comment above
1102 *
1103 * Disabling only independent events or group leaders,
1104 * keeping group members enabled.
1105 */
1106 if (evsel__is_group_leader(evsel))
1107 attr->disabled = 1;
1108
1109 /*
1110 * Setting enable_on_exec for independent events and
1111 * group leaders for traced executed by perf.
1112 */
1113 if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1114 !opts->initial_delay)
1115 attr->enable_on_exec = 1;
1116
1117 if (evsel->immediate) {
1118 attr->disabled = 0;
1119 attr->enable_on_exec = 0;
1120 }
1121
1122 clockid = opts->clockid;
1123 if (opts->use_clockid) {
1124 attr->use_clockid = 1;
1125 attr->clockid = opts->clockid;
1126 }
1127
1128 if (evsel->precise_max)
1129 attr->precise_ip = 3;
1130
1131 if (opts->all_user) {
1132 attr->exclude_kernel = 1;
1133 attr->exclude_user = 0;
1134 }
1135
1136 if (opts->all_kernel) {
1137 attr->exclude_kernel = 0;
1138 attr->exclude_user = 1;
1139 }
1140
1141 if (evsel->core.own_cpus || evsel->unit)
1142 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1143
1144 /*
1145 * Apply event specific term settings,
1146 * it overloads any global configuration.
1147 */
1148 apply_config_terms(evsel, opts, track);
1149
1150 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1151
1152 /* The --period option takes the precedence. */
1153 if (opts->period_set) {
1154 if (opts->period)
1155 evsel__set_sample_bit(evsel, PERIOD);
1156 else
1157 evsel__reset_sample_bit(evsel, PERIOD);
1158 }
1159
1160 /*
1161 * For initial_delay, a dummy event is added implicitly.
1162 * The software event will trigger -EOPNOTSUPP error out,
1163 * if BRANCH_STACK bit is set.
1164 */
1165 if (opts->initial_delay && is_dummy_event(evsel))
1166 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1167 }
1168
1169 int evsel__set_filter(struct evsel *evsel, const char *filter)
1170 {
1171 char *new_filter = strdup(filter);
1172
1173 if (new_filter != NULL) {
1174 free(evsel->filter);
1175 evsel->filter = new_filter;
1176 return 0;
1177 }
1178
1179 return -1;
1180 }
1181
1182 static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1183 {
1184 char *new_filter;
1185
1186 if (evsel->filter == NULL)
1187 return evsel__set_filter(evsel, filter);
1188
1189 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1190 free(evsel->filter);
1191 evsel->filter = new_filter;
1192 return 0;
1193 }
1194
1195 return -1;
1196 }
1197
1198 int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1199 {
1200 return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1201 }
1202
1203 int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1204 {
1205 return evsel__append_filter(evsel, "%s,%s", filter);
1206 }
1207
1208 /* Caller has to clear disabled after going through all CPUs. */
1209 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1210 {
1211 return perf_evsel__enable_cpu(&evsel->core, cpu);
1212 }
1213
1214 int evsel__enable(struct evsel *evsel)
1215 {
1216 int err = perf_evsel__enable(&evsel->core);
1217
1218 if (!err)
1219 evsel->disabled = false;
1220 return err;
1221 }
1222
1223 /* Caller has to set disabled after going through all CPUs. */
1224 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1225 {
1226 return perf_evsel__disable_cpu(&evsel->core, cpu);
1227 }
1228
1229 int evsel__disable(struct evsel *evsel)
1230 {
1231 int err = perf_evsel__disable(&evsel->core);
1232 /*
1233 * We mark it disabled here so that tools that disable a event can
1234 * ignore events after they disable it. I.e. the ring buffer may have
1235 * already a few more events queued up before the kernel got the stop
1236 * request.
1237 */
1238 if (!err)
1239 evsel->disabled = true;
1240
1241 return err;
1242 }
1243
1244 static void perf_evsel__free_config_terms(struct evsel *evsel)
1245 {
1246 struct perf_evsel_config_term *term, *h;
1247
1248 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1249 list_del_init(&term->list);
1250 if (term->free_str)
1251 zfree(&term->val.str);
1252 free(term);
1253 }
1254 }
1255
1256 void evsel__exit(struct evsel *evsel)
1257 {
1258 assert(list_empty(&evsel->core.node));
1259 assert(evsel->evlist == NULL);
1260 perf_evsel__free_counts(evsel);
1261 perf_evsel__free_fd(&evsel->core);
1262 perf_evsel__free_id(&evsel->core);
1263 perf_evsel__free_config_terms(evsel);
1264 cgroup__put(evsel->cgrp);
1265 perf_cpu_map__put(evsel->core.cpus);
1266 perf_cpu_map__put(evsel->core.own_cpus);
1267 perf_thread_map__put(evsel->core.threads);
1268 zfree(&evsel->group_name);
1269 zfree(&evsel->name);
1270 zfree(&evsel->pmu_name);
1271 perf_evsel__object.fini(evsel);
1272 }
1273
1274 void evsel__delete(struct evsel *evsel)
1275 {
1276 evsel__exit(evsel);
1277 free(evsel);
1278 }
1279
1280 void evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1281 struct perf_counts_values *count)
1282 {
1283 struct perf_counts_values tmp;
1284
1285 if (!evsel->prev_raw_counts)
1286 return;
1287
1288 if (cpu == -1) {
1289 tmp = evsel->prev_raw_counts->aggr;
1290 evsel->prev_raw_counts->aggr = *count;
1291 } else {
1292 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1293 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1294 }
1295
1296 count->val = count->val - tmp.val;
1297 count->ena = count->ena - tmp.ena;
1298 count->run = count->run - tmp.run;
1299 }
1300
1301 void perf_counts_values__scale(struct perf_counts_values *count,
1302 bool scale, s8 *pscaled)
1303 {
1304 s8 scaled = 0;
1305
1306 if (scale) {
1307 if (count->run == 0) {
1308 scaled = -1;
1309 count->val = 0;
1310 } else if (count->run < count->ena) {
1311 scaled = 1;
1312 count->val = (u64)((double) count->val * count->ena / count->run);
1313 }
1314 }
1315
1316 if (pscaled)
1317 *pscaled = scaled;
1318 }
1319
1320 static int evsel__read_one(struct evsel *evsel, int cpu, int thread)
1321 {
1322 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1323
1324 return perf_evsel__read(&evsel->core, cpu, thread, count);
1325 }
1326
1327 static void
1328 perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1329 u64 val, u64 ena, u64 run)
1330 {
1331 struct perf_counts_values *count;
1332
1333 count = perf_counts(counter->counts, cpu, thread);
1334
1335 count->val = val;
1336 count->ena = ena;
1337 count->run = run;
1338
1339 perf_counts__set_loaded(counter->counts, cpu, thread, true);
1340 }
1341
1342 static int
1343 perf_evsel__process_group_data(struct evsel *leader,
1344 int cpu, int thread, u64 *data)
1345 {
1346 u64 read_format = leader->core.attr.read_format;
1347 struct sample_read_value *v;
1348 u64 nr, ena = 0, run = 0, i;
1349
1350 nr = *data++;
1351
1352 if (nr != (u64) leader->core.nr_members)
1353 return -EINVAL;
1354
1355 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1356 ena = *data++;
1357
1358 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1359 run = *data++;
1360
1361 v = (struct sample_read_value *) data;
1362
1363 perf_evsel__set_count(leader, cpu, thread,
1364 v[0].value, ena, run);
1365
1366 for (i = 1; i < nr; i++) {
1367 struct evsel *counter;
1368
1369 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1370 if (!counter)
1371 return -EINVAL;
1372
1373 perf_evsel__set_count(counter, cpu, thread,
1374 v[i].value, ena, run);
1375 }
1376
1377 return 0;
1378 }
1379
1380 static int evsel__read_group(struct evsel *leader, int cpu, int thread)
1381 {
1382 struct perf_stat_evsel *ps = leader->stats;
1383 u64 read_format = leader->core.attr.read_format;
1384 int size = perf_evsel__read_size(&leader->core);
1385 u64 *data = ps->group_data;
1386
1387 if (!(read_format & PERF_FORMAT_ID))
1388 return -EINVAL;
1389
1390 if (!evsel__is_group_leader(leader))
1391 return -EINVAL;
1392
1393 if (!data) {
1394 data = zalloc(size);
1395 if (!data)
1396 return -ENOMEM;
1397
1398 ps->group_data = data;
1399 }
1400
1401 if (FD(leader, cpu, thread) < 0)
1402 return -EINVAL;
1403
1404 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1405 return -errno;
1406
1407 return perf_evsel__process_group_data(leader, cpu, thread, data);
1408 }
1409
1410 int evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1411 {
1412 u64 read_format = evsel->core.attr.read_format;
1413
1414 if (read_format & PERF_FORMAT_GROUP)
1415 return evsel__read_group(evsel, cpu, thread);
1416
1417 return evsel__read_one(evsel, cpu, thread);
1418 }
1419
1420 int __evsel__read_on_cpu(struct evsel *evsel, int cpu, int thread, bool scale)
1421 {
1422 struct perf_counts_values count;
1423 size_t nv = scale ? 3 : 1;
1424
1425 if (FD(evsel, cpu, thread) < 0)
1426 return -EINVAL;
1427
1428 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1429 return -ENOMEM;
1430
1431 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1432 return -errno;
1433
1434 evsel__compute_deltas(evsel, cpu, thread, &count);
1435 perf_counts_values__scale(&count, scale, NULL);
1436 *perf_counts(evsel->counts, cpu, thread) = count;
1437 return 0;
1438 }
1439
1440 static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1441 {
1442 struct evsel *leader = evsel->leader;
1443 int fd;
1444
1445 if (evsel__is_group_leader(evsel))
1446 return -1;
1447
1448 /*
1449 * Leader must be already processed/open,
1450 * if not it's a bug.
1451 */
1452 BUG_ON(!leader->core.fd);
1453
1454 fd = FD(leader, cpu, thread);
1455 BUG_ON(fd == -1);
1456
1457 return fd;
1458 }
1459
1460 static void perf_evsel__remove_fd(struct evsel *pos,
1461 int nr_cpus, int nr_threads,
1462 int thread_idx)
1463 {
1464 for (int cpu = 0; cpu < nr_cpus; cpu++)
1465 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1466 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1467 }
1468
1469 static int update_fds(struct evsel *evsel,
1470 int nr_cpus, int cpu_idx,
1471 int nr_threads, int thread_idx)
1472 {
1473 struct evsel *pos;
1474
1475 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1476 return -EINVAL;
1477
1478 evlist__for_each_entry(evsel->evlist, pos) {
1479 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1480
1481 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1482
1483 /*
1484 * Since fds for next evsel has not been created,
1485 * there is no need to iterate whole event list.
1486 */
1487 if (pos == evsel)
1488 break;
1489 }
1490 return 0;
1491 }
1492
1493 static bool ignore_missing_thread(struct evsel *evsel,
1494 int nr_cpus, int cpu,
1495 struct perf_thread_map *threads,
1496 int thread, int err)
1497 {
1498 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1499
1500 if (!evsel->ignore_missing_thread)
1501 return false;
1502
1503 /* The system wide setup does not work with threads. */
1504 if (evsel->core.system_wide)
1505 return false;
1506
1507 /* The -ESRCH is perf event syscall errno for pid's not found. */
1508 if (err != -ESRCH)
1509 return false;
1510
1511 /* If there's only one thread, let it fail. */
1512 if (threads->nr == 1)
1513 return false;
1514
1515 /*
1516 * We should remove fd for missing_thread first
1517 * because thread_map__remove() will decrease threads->nr.
1518 */
1519 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1520 return false;
1521
1522 if (thread_map__remove(threads, thread))
1523 return false;
1524
1525 pr_warning("WARNING: Ignored open failure for pid %d\n",
1526 ignore_pid);
1527 return true;
1528 }
1529
1530 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1531 void *priv __maybe_unused)
1532 {
1533 return fprintf(fp, " %-32s %s\n", name, val);
1534 }
1535
1536 static void display_attr(struct perf_event_attr *attr)
1537 {
1538 if (verbose >= 2 || debug_peo_args) {
1539 fprintf(stderr, "%.60s\n", graph_dotted_line);
1540 fprintf(stderr, "perf_event_attr:\n");
1541 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1542 fprintf(stderr, "%.60s\n", graph_dotted_line);
1543 }
1544 }
1545
1546 static int perf_event_open(struct evsel *evsel,
1547 pid_t pid, int cpu, int group_fd,
1548 unsigned long flags)
1549 {
1550 int precise_ip = evsel->core.attr.precise_ip;
1551 int fd;
1552
1553 while (1) {
1554 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1555 pid, cpu, group_fd, flags);
1556
1557 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1558 if (fd >= 0)
1559 break;
1560
1561 /* Do not try less precise if not requested. */
1562 if (!evsel->precise_max)
1563 break;
1564
1565 /*
1566 * We tried all the precise_ip values, and it's
1567 * still failing, so leave it to standard fallback.
1568 */
1569 if (!evsel->core.attr.precise_ip) {
1570 evsel->core.attr.precise_ip = precise_ip;
1571 break;
1572 }
1573
1574 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1575 evsel->core.attr.precise_ip--;
1576 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1577 display_attr(&evsel->core.attr);
1578 }
1579
1580 return fd;
1581 }
1582
1583 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
1584 struct perf_thread_map *threads,
1585 int start_cpu, int end_cpu)
1586 {
1587 int cpu, thread, nthreads;
1588 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1589 int pid = -1, err, old_errno;
1590 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1591
1592 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1593 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1594 return -EINVAL;
1595
1596 if (cpus == NULL) {
1597 static struct perf_cpu_map *empty_cpu_map;
1598
1599 if (empty_cpu_map == NULL) {
1600 empty_cpu_map = perf_cpu_map__dummy_new();
1601 if (empty_cpu_map == NULL)
1602 return -ENOMEM;
1603 }
1604
1605 cpus = empty_cpu_map;
1606 }
1607
1608 if (threads == NULL) {
1609 static struct perf_thread_map *empty_thread_map;
1610
1611 if (empty_thread_map == NULL) {
1612 empty_thread_map = thread_map__new_by_tid(-1);
1613 if (empty_thread_map == NULL)
1614 return -ENOMEM;
1615 }
1616
1617 threads = empty_thread_map;
1618 }
1619
1620 if (evsel->core.system_wide)
1621 nthreads = 1;
1622 else
1623 nthreads = threads->nr;
1624
1625 if (evsel->core.fd == NULL &&
1626 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1627 return -ENOMEM;
1628
1629 if (evsel->cgrp) {
1630 flags |= PERF_FLAG_PID_CGROUP;
1631 pid = evsel->cgrp->fd;
1632 }
1633
1634 fallback_missing_features:
1635 if (perf_missing_features.clockid_wrong)
1636 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1637 if (perf_missing_features.clockid) {
1638 evsel->core.attr.use_clockid = 0;
1639 evsel->core.attr.clockid = 0;
1640 }
1641 if (perf_missing_features.cloexec)
1642 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1643 if (perf_missing_features.mmap2)
1644 evsel->core.attr.mmap2 = 0;
1645 if (perf_missing_features.exclude_guest)
1646 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1647 if (perf_missing_features.lbr_flags)
1648 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1649 PERF_SAMPLE_BRANCH_NO_CYCLES);
1650 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1651 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1652 if (perf_missing_features.ksymbol)
1653 evsel->core.attr.ksymbol = 0;
1654 if (perf_missing_features.bpf)
1655 evsel->core.attr.bpf_event = 0;
1656 if (perf_missing_features.branch_hw_idx)
1657 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1658 retry_sample_id:
1659 if (perf_missing_features.sample_id_all)
1660 evsel->core.attr.sample_id_all = 0;
1661
1662 display_attr(&evsel->core.attr);
1663
1664 for (cpu = start_cpu; cpu < end_cpu; cpu++) {
1665
1666 for (thread = 0; thread < nthreads; thread++) {
1667 int fd, group_fd;
1668
1669 if (!evsel->cgrp && !evsel->core.system_wide)
1670 pid = perf_thread_map__pid(threads, thread);
1671
1672 group_fd = get_group_fd(evsel, cpu, thread);
1673 retry_open:
1674 test_attr__ready();
1675
1676 fd = perf_event_open(evsel, pid, cpus->map[cpu],
1677 group_fd, flags);
1678
1679 FD(evsel, cpu, thread) = fd;
1680
1681 if (fd < 0) {
1682 err = -errno;
1683
1684 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1685 /*
1686 * We just removed 1 thread, so take a step
1687 * back on thread index and lower the upper
1688 * nthreads limit.
1689 */
1690 nthreads--;
1691 thread--;
1692
1693 /* ... and pretend like nothing have happened. */
1694 err = 0;
1695 continue;
1696 }
1697
1698 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
1699 err);
1700 goto try_fallback;
1701 }
1702
1703 pr_debug2_peo(" = %d\n", fd);
1704
1705 if (evsel->bpf_fd >= 0) {
1706 int evt_fd = fd;
1707 int bpf_fd = evsel->bpf_fd;
1708
1709 err = ioctl(evt_fd,
1710 PERF_EVENT_IOC_SET_BPF,
1711 bpf_fd);
1712 if (err && errno != EEXIST) {
1713 pr_err("failed to attach bpf fd %d: %s\n",
1714 bpf_fd, strerror(errno));
1715 err = -EINVAL;
1716 goto out_close;
1717 }
1718 }
1719
1720 set_rlimit = NO_CHANGE;
1721
1722 /*
1723 * If we succeeded but had to kill clockid, fail and
1724 * have evsel__open_strerror() print us a nice error.
1725 */
1726 if (perf_missing_features.clockid ||
1727 perf_missing_features.clockid_wrong) {
1728 err = -EINVAL;
1729 goto out_close;
1730 }
1731 }
1732 }
1733
1734 return 0;
1735
1736 try_fallback:
1737 /*
1738 * perf stat needs between 5 and 22 fds per CPU. When we run out
1739 * of them try to increase the limits.
1740 */
1741 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1742 struct rlimit l;
1743
1744 old_errno = errno;
1745 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1746 if (set_rlimit == NO_CHANGE)
1747 l.rlim_cur = l.rlim_max;
1748 else {
1749 l.rlim_cur = l.rlim_max + 1000;
1750 l.rlim_max = l.rlim_cur;
1751 }
1752 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1753 set_rlimit++;
1754 errno = old_errno;
1755 goto retry_open;
1756 }
1757 }
1758 errno = old_errno;
1759 }
1760
1761 if (err != -EINVAL || cpu > 0 || thread > 0)
1762 goto out_close;
1763
1764 /*
1765 * Must probe features in the order they were added to the
1766 * perf_event_attr interface.
1767 */
1768 if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1769 perf_missing_features.cgroup = true;
1770 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1771 goto out_close;
1772 } else if (!perf_missing_features.branch_hw_idx &&
1773 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1774 perf_missing_features.branch_hw_idx = true;
1775 pr_debug2("switching off branch HW index support\n");
1776 goto fallback_missing_features;
1777 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1778 perf_missing_features.aux_output = true;
1779 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1780 goto out_close;
1781 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1782 perf_missing_features.bpf = true;
1783 pr_debug2_peo("switching off bpf_event\n");
1784 goto fallback_missing_features;
1785 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1786 perf_missing_features.ksymbol = true;
1787 pr_debug2_peo("switching off ksymbol\n");
1788 goto fallback_missing_features;
1789 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1790 perf_missing_features.write_backward = true;
1791 pr_debug2_peo("switching off write_backward\n");
1792 goto out_close;
1793 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1794 perf_missing_features.clockid_wrong = true;
1795 pr_debug2_peo("switching off clockid\n");
1796 goto fallback_missing_features;
1797 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1798 perf_missing_features.clockid = true;
1799 pr_debug2_peo("switching off use_clockid\n");
1800 goto fallback_missing_features;
1801 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1802 perf_missing_features.cloexec = true;
1803 pr_debug2_peo("switching off cloexec flag\n");
1804 goto fallback_missing_features;
1805 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1806 perf_missing_features.mmap2 = true;
1807 pr_debug2_peo("switching off mmap2\n");
1808 goto fallback_missing_features;
1809 } else if (!perf_missing_features.exclude_guest &&
1810 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1811 perf_missing_features.exclude_guest = true;
1812 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1813 goto fallback_missing_features;
1814 } else if (!perf_missing_features.sample_id_all) {
1815 perf_missing_features.sample_id_all = true;
1816 pr_debug2_peo("switching off sample_id_all\n");
1817 goto retry_sample_id;
1818 } else if (!perf_missing_features.lbr_flags &&
1819 (evsel->core.attr.branch_sample_type &
1820 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1821 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1822 perf_missing_features.lbr_flags = true;
1823 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1824 goto fallback_missing_features;
1825 } else if (!perf_missing_features.group_read &&
1826 evsel->core.attr.inherit &&
1827 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1828 evsel__is_group_leader(evsel)) {
1829 perf_missing_features.group_read = true;
1830 pr_debug2_peo("switching off group read\n");
1831 goto fallback_missing_features;
1832 }
1833 out_close:
1834 if (err)
1835 threads->err_thread = thread;
1836
1837 old_errno = errno;
1838 do {
1839 while (--thread >= 0) {
1840 if (FD(evsel, cpu, thread) >= 0)
1841 close(FD(evsel, cpu, thread));
1842 FD(evsel, cpu, thread) = -1;
1843 }
1844 thread = nthreads;
1845 } while (--cpu >= 0);
1846 errno = old_errno;
1847 return err;
1848 }
1849
1850 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
1851 struct perf_thread_map *threads)
1852 {
1853 return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
1854 }
1855
1856 void evsel__close(struct evsel *evsel)
1857 {
1858 perf_evsel__close(&evsel->core);
1859 perf_evsel__free_id(&evsel->core);
1860 }
1861
1862 int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu)
1863 {
1864 if (cpu == -1)
1865 return evsel__open_cpu(evsel, cpus, NULL, 0,
1866 cpus ? cpus->nr : 1);
1867
1868 return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
1869 }
1870
1871 int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
1872 {
1873 return evsel__open(evsel, NULL, threads);
1874 }
1875
1876 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1877 const union perf_event *event,
1878 struct perf_sample *sample)
1879 {
1880 u64 type = evsel->core.attr.sample_type;
1881 const __u64 *array = event->sample.array;
1882 bool swapped = evsel->needs_swap;
1883 union u64_swap u;
1884
1885 array += ((event->header.size -
1886 sizeof(event->header)) / sizeof(u64)) - 1;
1887
1888 if (type & PERF_SAMPLE_IDENTIFIER) {
1889 sample->id = *array;
1890 array--;
1891 }
1892
1893 if (type & PERF_SAMPLE_CPU) {
1894 u.val64 = *array;
1895 if (swapped) {
1896 /* undo swap of u64, then swap on individual u32s */
1897 u.val64 = bswap_64(u.val64);
1898 u.val32[0] = bswap_32(u.val32[0]);
1899 }
1900
1901 sample->cpu = u.val32[0];
1902 array--;
1903 }
1904
1905 if (type & PERF_SAMPLE_STREAM_ID) {
1906 sample->stream_id = *array;
1907 array--;
1908 }
1909
1910 if (type & PERF_SAMPLE_ID) {
1911 sample->id = *array;
1912 array--;
1913 }
1914
1915 if (type & PERF_SAMPLE_TIME) {
1916 sample->time = *array;
1917 array--;
1918 }
1919
1920 if (type & PERF_SAMPLE_TID) {
1921 u.val64 = *array;
1922 if (swapped) {
1923 /* undo swap of u64, then swap on individual u32s */
1924 u.val64 = bswap_64(u.val64);
1925 u.val32[0] = bswap_32(u.val32[0]);
1926 u.val32[1] = bswap_32(u.val32[1]);
1927 }
1928
1929 sample->pid = u.val32[0];
1930 sample->tid = u.val32[1];
1931 array--;
1932 }
1933
1934 return 0;
1935 }
1936
1937 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1938 u64 size)
1939 {
1940 return size > max_size || offset + size > endp;
1941 }
1942
1943 #define OVERFLOW_CHECK(offset, size, max_size) \
1944 do { \
1945 if (overflow(endp, (max_size), (offset), (size))) \
1946 return -EFAULT; \
1947 } while (0)
1948
1949 #define OVERFLOW_CHECK_u64(offset) \
1950 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1951
1952 static int
1953 perf_event__check_size(union perf_event *event, unsigned int sample_size)
1954 {
1955 /*
1956 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1957 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1958 * check the format does not go past the end of the event.
1959 */
1960 if (sample_size + sizeof(event->header) > event->header.size)
1961 return -EFAULT;
1962
1963 return 0;
1964 }
1965
1966 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1967 struct perf_sample *data)
1968 {
1969 u64 type = evsel->core.attr.sample_type;
1970 bool swapped = evsel->needs_swap;
1971 const __u64 *array;
1972 u16 max_size = event->header.size;
1973 const void *endp = (void *)event + max_size;
1974 u64 sz;
1975
1976 /*
1977 * used for cross-endian analysis. See git commit 65014ab3
1978 * for why this goofiness is needed.
1979 */
1980 union u64_swap u;
1981
1982 memset(data, 0, sizeof(*data));
1983 data->cpu = data->pid = data->tid = -1;
1984 data->stream_id = data->id = data->time = -1ULL;
1985 data->period = evsel->core.attr.sample_period;
1986 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1987 data->misc = event->header.misc;
1988 data->id = -1ULL;
1989 data->data_src = PERF_MEM_DATA_SRC_NONE;
1990
1991 if (event->header.type != PERF_RECORD_SAMPLE) {
1992 if (!evsel->core.attr.sample_id_all)
1993 return 0;
1994 return perf_evsel__parse_id_sample(evsel, event, data);
1995 }
1996
1997 array = event->sample.array;
1998
1999 if (perf_event__check_size(event, evsel->sample_size))
2000 return -EFAULT;
2001
2002 if (type & PERF_SAMPLE_IDENTIFIER) {
2003 data->id = *array;
2004 array++;
2005 }
2006
2007 if (type & PERF_SAMPLE_IP) {
2008 data->ip = *array;
2009 array++;
2010 }
2011
2012 if (type & PERF_SAMPLE_TID) {
2013 u.val64 = *array;
2014 if (swapped) {
2015 /* undo swap of u64, then swap on individual u32s */
2016 u.val64 = bswap_64(u.val64);
2017 u.val32[0] = bswap_32(u.val32[0]);
2018 u.val32[1] = bswap_32(u.val32[1]);
2019 }
2020
2021 data->pid = u.val32[0];
2022 data->tid = u.val32[1];
2023 array++;
2024 }
2025
2026 if (type & PERF_SAMPLE_TIME) {
2027 data->time = *array;
2028 array++;
2029 }
2030
2031 if (type & PERF_SAMPLE_ADDR) {
2032 data->addr = *array;
2033 array++;
2034 }
2035
2036 if (type & PERF_SAMPLE_ID) {
2037 data->id = *array;
2038 array++;
2039 }
2040
2041 if (type & PERF_SAMPLE_STREAM_ID) {
2042 data->stream_id = *array;
2043 array++;
2044 }
2045
2046 if (type & PERF_SAMPLE_CPU) {
2047
2048 u.val64 = *array;
2049 if (swapped) {
2050 /* undo swap of u64, then swap on individual u32s */
2051 u.val64 = bswap_64(u.val64);
2052 u.val32[0] = bswap_32(u.val32[0]);
2053 }
2054
2055 data->cpu = u.val32[0];
2056 array++;
2057 }
2058
2059 if (type & PERF_SAMPLE_PERIOD) {
2060 data->period = *array;
2061 array++;
2062 }
2063
2064 if (type & PERF_SAMPLE_READ) {
2065 u64 read_format = evsel->core.attr.read_format;
2066
2067 OVERFLOW_CHECK_u64(array);
2068 if (read_format & PERF_FORMAT_GROUP)
2069 data->read.group.nr = *array;
2070 else
2071 data->read.one.value = *array;
2072
2073 array++;
2074
2075 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2076 OVERFLOW_CHECK_u64(array);
2077 data->read.time_enabled = *array;
2078 array++;
2079 }
2080
2081 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2082 OVERFLOW_CHECK_u64(array);
2083 data->read.time_running = *array;
2084 array++;
2085 }
2086
2087 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2088 if (read_format & PERF_FORMAT_GROUP) {
2089 const u64 max_group_nr = UINT64_MAX /
2090 sizeof(struct sample_read_value);
2091
2092 if (data->read.group.nr > max_group_nr)
2093 return -EFAULT;
2094 sz = data->read.group.nr *
2095 sizeof(struct sample_read_value);
2096 OVERFLOW_CHECK(array, sz, max_size);
2097 data->read.group.values =
2098 (struct sample_read_value *)array;
2099 array = (void *)array + sz;
2100 } else {
2101 OVERFLOW_CHECK_u64(array);
2102 data->read.one.id = *array;
2103 array++;
2104 }
2105 }
2106
2107 if (type & PERF_SAMPLE_CALLCHAIN) {
2108 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2109
2110 OVERFLOW_CHECK_u64(array);
2111 data->callchain = (struct ip_callchain *)array++;
2112 if (data->callchain->nr > max_callchain_nr)
2113 return -EFAULT;
2114 sz = data->callchain->nr * sizeof(u64);
2115 OVERFLOW_CHECK(array, sz, max_size);
2116 array = (void *)array + sz;
2117 }
2118
2119 if (type & PERF_SAMPLE_RAW) {
2120 OVERFLOW_CHECK_u64(array);
2121 u.val64 = *array;
2122
2123 /*
2124 * Undo swap of u64, then swap on individual u32s,
2125 * get the size of the raw area and undo all of the
2126 * swap. The pevent interface handles endianity by
2127 * itself.
2128 */
2129 if (swapped) {
2130 u.val64 = bswap_64(u.val64);
2131 u.val32[0] = bswap_32(u.val32[0]);
2132 u.val32[1] = bswap_32(u.val32[1]);
2133 }
2134 data->raw_size = u.val32[0];
2135
2136 /*
2137 * The raw data is aligned on 64bits including the
2138 * u32 size, so it's safe to use mem_bswap_64.
2139 */
2140 if (swapped)
2141 mem_bswap_64((void *) array, data->raw_size);
2142
2143 array = (void *)array + sizeof(u32);
2144
2145 OVERFLOW_CHECK(array, data->raw_size, max_size);
2146 data->raw_data = (void *)array;
2147 array = (void *)array + data->raw_size;
2148 }
2149
2150 if (type & PERF_SAMPLE_BRANCH_STACK) {
2151 const u64 max_branch_nr = UINT64_MAX /
2152 sizeof(struct branch_entry);
2153
2154 OVERFLOW_CHECK_u64(array);
2155 data->branch_stack = (struct branch_stack *)array++;
2156
2157 if (data->branch_stack->nr > max_branch_nr)
2158 return -EFAULT;
2159
2160 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2161 if (evsel__has_branch_hw_idx(evsel))
2162 sz += sizeof(u64);
2163 else
2164 data->no_hw_idx = true;
2165 OVERFLOW_CHECK(array, sz, max_size);
2166 array = (void *)array + sz;
2167 }
2168
2169 if (type & PERF_SAMPLE_REGS_USER) {
2170 OVERFLOW_CHECK_u64(array);
2171 data->user_regs.abi = *array;
2172 array++;
2173
2174 if (data->user_regs.abi) {
2175 u64 mask = evsel->core.attr.sample_regs_user;
2176
2177 sz = hweight64(mask) * sizeof(u64);
2178 OVERFLOW_CHECK(array, sz, max_size);
2179 data->user_regs.mask = mask;
2180 data->user_regs.regs = (u64 *)array;
2181 array = (void *)array + sz;
2182 }
2183 }
2184
2185 if (type & PERF_SAMPLE_STACK_USER) {
2186 OVERFLOW_CHECK_u64(array);
2187 sz = *array++;
2188
2189 data->user_stack.offset = ((char *)(array - 1)
2190 - (char *) event);
2191
2192 if (!sz) {
2193 data->user_stack.size = 0;
2194 } else {
2195 OVERFLOW_CHECK(array, sz, max_size);
2196 data->user_stack.data = (char *)array;
2197 array = (void *)array + sz;
2198 OVERFLOW_CHECK_u64(array);
2199 data->user_stack.size = *array++;
2200 if (WARN_ONCE(data->user_stack.size > sz,
2201 "user stack dump failure\n"))
2202 return -EFAULT;
2203 }
2204 }
2205
2206 if (type & PERF_SAMPLE_WEIGHT) {
2207 OVERFLOW_CHECK_u64(array);
2208 data->weight = *array;
2209 array++;
2210 }
2211
2212 if (type & PERF_SAMPLE_DATA_SRC) {
2213 OVERFLOW_CHECK_u64(array);
2214 data->data_src = *array;
2215 array++;
2216 }
2217
2218 if (type & PERF_SAMPLE_TRANSACTION) {
2219 OVERFLOW_CHECK_u64(array);
2220 data->transaction = *array;
2221 array++;
2222 }
2223
2224 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2225 if (type & PERF_SAMPLE_REGS_INTR) {
2226 OVERFLOW_CHECK_u64(array);
2227 data->intr_regs.abi = *array;
2228 array++;
2229
2230 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2231 u64 mask = evsel->core.attr.sample_regs_intr;
2232
2233 sz = hweight64(mask) * sizeof(u64);
2234 OVERFLOW_CHECK(array, sz, max_size);
2235 data->intr_regs.mask = mask;
2236 data->intr_regs.regs = (u64 *)array;
2237 array = (void *)array + sz;
2238 }
2239 }
2240
2241 data->phys_addr = 0;
2242 if (type & PERF_SAMPLE_PHYS_ADDR) {
2243 data->phys_addr = *array;
2244 array++;
2245 }
2246
2247 data->cgroup = 0;
2248 if (type & PERF_SAMPLE_CGROUP) {
2249 data->cgroup = *array;
2250 array++;
2251 }
2252
2253 if (type & PERF_SAMPLE_AUX) {
2254 OVERFLOW_CHECK_u64(array);
2255 sz = *array++;
2256
2257 OVERFLOW_CHECK(array, sz, max_size);
2258 /* Undo swap of data */
2259 if (swapped)
2260 mem_bswap_64((char *)array, sz);
2261 data->aux_sample.size = sz;
2262 data->aux_sample.data = (char *)array;
2263 array = (void *)array + sz;
2264 }
2265
2266 return 0;
2267 }
2268
2269 int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
2270 u64 *timestamp)
2271 {
2272 u64 type = evsel->core.attr.sample_type;
2273 const __u64 *array;
2274
2275 if (!(type & PERF_SAMPLE_TIME))
2276 return -1;
2277
2278 if (event->header.type != PERF_RECORD_SAMPLE) {
2279 struct perf_sample data = {
2280 .time = -1ULL,
2281 };
2282
2283 if (!evsel->core.attr.sample_id_all)
2284 return -1;
2285 if (perf_evsel__parse_id_sample(evsel, event, &data))
2286 return -1;
2287
2288 *timestamp = data.time;
2289 return 0;
2290 }
2291
2292 array = event->sample.array;
2293
2294 if (perf_event__check_size(event, evsel->sample_size))
2295 return -EFAULT;
2296
2297 if (type & PERF_SAMPLE_IDENTIFIER)
2298 array++;
2299
2300 if (type & PERF_SAMPLE_IP)
2301 array++;
2302
2303 if (type & PERF_SAMPLE_TID)
2304 array++;
2305
2306 if (type & PERF_SAMPLE_TIME)
2307 *timestamp = *array;
2308
2309 return 0;
2310 }
2311
2312 struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
2313 {
2314 return tep_find_field(evsel->tp_format, name);
2315 }
2316
2317 void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
2318 {
2319 struct tep_format_field *field = evsel__field(evsel, name);
2320 int offset;
2321
2322 if (!field)
2323 return NULL;
2324
2325 offset = field->offset;
2326
2327 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2328 offset = *(int *)(sample->raw_data + field->offset);
2329 offset &= 0xffff;
2330 }
2331
2332 return sample->raw_data + offset;
2333 }
2334
2335 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2336 bool needs_swap)
2337 {
2338 u64 value;
2339 void *ptr = sample->raw_data + field->offset;
2340
2341 switch (field->size) {
2342 case 1:
2343 return *(u8 *)ptr;
2344 case 2:
2345 value = *(u16 *)ptr;
2346 break;
2347 case 4:
2348 value = *(u32 *)ptr;
2349 break;
2350 case 8:
2351 memcpy(&value, ptr, sizeof(u64));
2352 break;
2353 default:
2354 return 0;
2355 }
2356
2357 if (!needs_swap)
2358 return value;
2359
2360 switch (field->size) {
2361 case 2:
2362 return bswap_16(value);
2363 case 4:
2364 return bswap_32(value);
2365 case 8:
2366 return bswap_64(value);
2367 default:
2368 return 0;
2369 }
2370
2371 return 0;
2372 }
2373
2374 u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
2375 {
2376 struct tep_format_field *field = evsel__field(evsel, name);
2377
2378 if (!field)
2379 return 0;
2380
2381 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2382 }
2383
2384 bool evsel__fallback(struct evsel *evsel, int err, char *msg, size_t msgsize)
2385 {
2386 int paranoid;
2387
2388 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2389 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2390 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2391 /*
2392 * If it's cycles then fall back to hrtimer based
2393 * cpu-clock-tick sw counter, which is always available even if
2394 * no PMU support.
2395 *
2396 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2397 * b0a873e).
2398 */
2399 scnprintf(msg, msgsize, "%s",
2400 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2401
2402 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2403 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2404
2405 zfree(&evsel->name);
2406 return true;
2407 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2408 (paranoid = perf_event_paranoid()) > 1) {
2409 const char *name = evsel__name(evsel);
2410 char *new_name;
2411 const char *sep = ":";
2412
2413 /* If event has exclude user then don't exclude kernel. */
2414 if (evsel->core.attr.exclude_user)
2415 return false;
2416
2417 /* Is there already the separator in the name. */
2418 if (strchr(name, '/') ||
2419 strchr(name, ':'))
2420 sep = "";
2421
2422 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2423 return false;
2424
2425 if (evsel->name)
2426 free(evsel->name);
2427 evsel->name = new_name;
2428 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2429 "to fall back to excluding kernel and hypervisor "
2430 " samples", paranoid);
2431 evsel->core.attr.exclude_kernel = 1;
2432 evsel->core.attr.exclude_hv = 1;
2433
2434 return true;
2435 }
2436
2437 return false;
2438 }
2439
2440 static bool find_process(const char *name)
2441 {
2442 size_t len = strlen(name);
2443 DIR *dir;
2444 struct dirent *d;
2445 int ret = -1;
2446
2447 dir = opendir(procfs__mountpoint());
2448 if (!dir)
2449 return false;
2450
2451 /* Walk through the directory. */
2452 while (ret && (d = readdir(dir)) != NULL) {
2453 char path[PATH_MAX];
2454 char *data;
2455 size_t size;
2456
2457 if ((d->d_type != DT_DIR) ||
2458 !strcmp(".", d->d_name) ||
2459 !strcmp("..", d->d_name))
2460 continue;
2461
2462 scnprintf(path, sizeof(path), "%s/%s/comm",
2463 procfs__mountpoint(), d->d_name);
2464
2465 if (filename__read_str(path, &data, &size))
2466 continue;
2467
2468 ret = strncmp(name, data, len);
2469 free(data);
2470 }
2471
2472 closedir(dir);
2473 return ret ? false : true;
2474 }
2475
2476 int evsel__open_strerror(struct evsel *evsel, struct target *target,
2477 int err, char *msg, size_t size)
2478 {
2479 char sbuf[STRERR_BUFSIZE];
2480 int printed = 0;
2481
2482 switch (err) {
2483 case EPERM:
2484 case EACCES:
2485 if (err == EPERM)
2486 printed = scnprintf(msg, size,
2487 "No permission to enable %s event.\n\n", evsel__name(evsel));
2488
2489 return scnprintf(msg + printed, size - printed,
2490 "You may not have permission to collect %sstats.\n\n"
2491 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2492 "which controls use of the performance events system by\n"
2493 "unprivileged users (without CAP_PERFMON or CAP_SYS_ADMIN).\n\n"
2494 "The current value is %d:\n\n"
2495 " -1: Allow use of (almost) all events by all users\n"
2496 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2497 ">= 0: Disallow ftrace function tracepoint by users without CAP_PERFMON or CAP_SYS_ADMIN\n"
2498 " Disallow raw tracepoint access by users without CAP_SYS_PERFMON or CAP_SYS_ADMIN\n"
2499 ">= 1: Disallow CPU event access by users without CAP_PERFMON or CAP_SYS_ADMIN\n"
2500 ">= 2: Disallow kernel profiling by users without CAP_PERFMON or CAP_SYS_ADMIN\n\n"
2501 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2502 " kernel.perf_event_paranoid = -1\n" ,
2503 target->system_wide ? "system-wide " : "",
2504 perf_event_paranoid());
2505 case ENOENT:
2506 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
2507 case EMFILE:
2508 return scnprintf(msg, size, "%s",
2509 "Too many events are opened.\n"
2510 "Probably the maximum number of open file descriptors has been reached.\n"
2511 "Hint: Try again after reducing the number of events.\n"
2512 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2513 case ENOMEM:
2514 if (evsel__has_callchain(evsel) &&
2515 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2516 return scnprintf(msg, size,
2517 "Not enough memory to setup event with callchain.\n"
2518 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2519 "Hint: Current value: %d", sysctl__max_stack());
2520 break;
2521 case ENODEV:
2522 if (target->cpu_list)
2523 return scnprintf(msg, size, "%s",
2524 "No such device - did you specify an out-of-range profile CPU?");
2525 break;
2526 case EOPNOTSUPP:
2527 if (evsel->core.attr.sample_period != 0)
2528 return scnprintf(msg, size,
2529 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2530 evsel__name(evsel));
2531 if (evsel->core.attr.precise_ip)
2532 return scnprintf(msg, size, "%s",
2533 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2534 #if defined(__i386__) || defined(__x86_64__)
2535 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2536 return scnprintf(msg, size, "%s",
2537 "No hardware sampling interrupt available.\n");
2538 #endif
2539 break;
2540 case EBUSY:
2541 if (find_process("oprofiled"))
2542 return scnprintf(msg, size,
2543 "The PMU counters are busy/taken by another profiler.\n"
2544 "We found oprofile daemon running, please stop it and try again.");
2545 break;
2546 case EINVAL:
2547 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2548 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2549 if (perf_missing_features.clockid)
2550 return scnprintf(msg, size, "clockid feature not supported.");
2551 if (perf_missing_features.clockid_wrong)
2552 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2553 if (perf_missing_features.aux_output)
2554 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2555 break;
2556 default:
2557 break;
2558 }
2559
2560 return scnprintf(msg, size,
2561 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2562 "/bin/dmesg | grep -i perf may provide additional information.\n",
2563 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
2564 }
2565
2566 struct perf_env *evsel__env(struct evsel *evsel)
2567 {
2568 if (evsel && evsel->evlist)
2569 return evsel->evlist->env;
2570 return &perf_env;
2571 }
2572
2573 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2574 {
2575 int cpu, thread;
2576
2577 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2578 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2579 thread++) {
2580 int fd = FD(evsel, cpu, thread);
2581
2582 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2583 cpu, thread, fd) < 0)
2584 return -1;
2585 }
2586 }
2587
2588 return 0;
2589 }
2590
2591 int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2592 {
2593 struct perf_cpu_map *cpus = evsel->core.cpus;
2594 struct perf_thread_map *threads = evsel->core.threads;
2595
2596 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2597 return -ENOMEM;
2598
2599 return store_evsel_ids(evsel, evlist);
2600 }
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