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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / tools / perf / util / evsel.c
blobeb880efbce16dcadec399cc4530dd0ba47ee630a
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 __perf_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 perf_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 __perf_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 perf_evsel__calc_id_pos(evsel);
194 }
195 }
196
197 void __perf_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 perf_evsel__calc_id_pos(evsel);
204 }
205 }
206
207 void perf_evsel__set_sample_id(struct evsel *evsel,
208 bool can_sample_identifier)
209 {
210 if (can_sample_identifier) {
211 perf_evsel__reset_sample_bit(evsel, ID);
212 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
213 } else {
214 perf_evsel__set_sample_bit(evsel, ID);
215 }
216 evsel->core.attr.read_format |= PERF_FORMAT_ID;
217 }
218
219 /**
220 * perf_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 perf_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 = __perf_evsel__sample_size(attr->sample_type);
253 perf_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 (perf_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 (perf_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 *__perf_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 perf_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
433 {
434 int r = scnprintf(bf, size, "%s", __perf_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 *__perf_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 perf_evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
459 {
460 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->core.attr.config));
461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
462 }
463
464 static int __perf_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 perf_evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
483 {
484 struct perf_event_attr *attr = &evsel->core.attr;
485 int r = __perf_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 perf_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 __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
543 char *bf, size_t size)
544 {
545 if (result) {
546 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
547 perf_evsel__hw_cache_op[op][0],
548 perf_evsel__hw_cache_result[result][0]);
549 }
550
551 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
552 perf_evsel__hw_cache_op[op][1]);
553 }
554
555 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
556 {
557 u8 op, result, type = (config >> 0) & 0xff;
558 const char *err = "unknown-ext-hardware-cache-type";
559
560 if (type >= PERF_COUNT_HW_CACHE_MAX)
561 goto out_err;
562
563 op = (config >> 8) & 0xff;
564 err = "unknown-ext-hardware-cache-op";
565 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
566 goto out_err;
567
568 result = (config >> 16) & 0xff;
569 err = "unknown-ext-hardware-cache-result";
570 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
571 goto out_err;
572
573 err = "invalid-cache";
574 if (!perf_evsel__is_cache_op_valid(type, op))
575 goto out_err;
576
577 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
578 out_err:
579 return scnprintf(bf, size, "%s", err);
580 }
581
582 static int perf_evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
583 {
584 int ret = __perf_evsel__hw_cache_name(evsel->core.attr.config, bf, size);
585 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
586 }
587
588 static int perf_evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
589 {
590 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
591 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
592 }
593
594 static int perf_evsel__tool_name(char *bf, size_t size)
595 {
596 int ret = scnprintf(bf, size, "duration_time");
597 return ret;
598 }
599
600 const char *perf_evsel__name(struct evsel *evsel)
601 {
602 char bf[128];
603
604 if (!evsel)
605 goto out_unknown;
606
607 if (evsel->name)
608 return evsel->name;
609
610 switch (evsel->core.attr.type) {
611 case PERF_TYPE_RAW:
612 perf_evsel__raw_name(evsel, bf, sizeof(bf));
613 break;
614
615 case PERF_TYPE_HARDWARE:
616 perf_evsel__hw_name(evsel, bf, sizeof(bf));
617 break;
618
619 case PERF_TYPE_HW_CACHE:
620 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
621 break;
622
623 case PERF_TYPE_SOFTWARE:
624 if (evsel->tool_event)
625 perf_evsel__tool_name(bf, sizeof(bf));
626 else
627 perf_evsel__sw_name(evsel, bf, sizeof(bf));
628 break;
629
630 case PERF_TYPE_TRACEPOINT:
631 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
632 break;
633
634 case PERF_TYPE_BREAKPOINT:
635 perf_evsel__bp_name(evsel, bf, sizeof(bf));
636 break;
637
638 default:
639 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
640 evsel->core.attr.type);
641 break;
642 }
643
644 evsel->name = strdup(bf);
645
646 if (evsel->name)
647 return evsel->name;
648 out_unknown:
649 return "unknown";
650 }
651
652 const char *perf_evsel__group_name(struct evsel *evsel)
653 {
654 return evsel->group_name ?: "anon group";
655 }
656
657 /*
658 * Returns the group details for the specified leader,
659 * with following rules.
660 *
661 * For record -e '{cycles,instructions}'
662 * 'anon group { cycles:u, instructions:u }'
663 *
664 * For record -e 'cycles,instructions' and report --group
665 * 'cycles:u, instructions:u'
666 */
667 int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
668 {
669 int ret = 0;
670 struct evsel *pos;
671 const char *group_name = perf_evsel__group_name(evsel);
672
673 if (!evsel->forced_leader)
674 ret = scnprintf(buf, size, "%s { ", group_name);
675
676 ret += scnprintf(buf + ret, size - ret, "%s",
677 perf_evsel__name(evsel));
678
679 for_each_group_member(pos, evsel)
680 ret += scnprintf(buf + ret, size - ret, ", %s",
681 perf_evsel__name(pos));
682
683 if (!evsel->forced_leader)
684 ret += scnprintf(buf + ret, size - ret, " }");
685
686 return ret;
687 }
688
689 static void __perf_evsel__config_callchain(struct evsel *evsel,
690 struct record_opts *opts,
691 struct callchain_param *param)
692 {
693 bool function = perf_evsel__is_function_event(evsel);
694 struct perf_event_attr *attr = &evsel->core.attr;
695
696 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
697
698 attr->sample_max_stack = param->max_stack;
699
700 if (opts->kernel_callchains)
701 attr->exclude_callchain_user = 1;
702 if (opts->user_callchains)
703 attr->exclude_callchain_kernel = 1;
704 if (param->record_mode == CALLCHAIN_LBR) {
705 if (!opts->branch_stack) {
706 if (attr->exclude_user) {
707 pr_warning("LBR callstack option is only available "
708 "to get user callchain information. "
709 "Falling back to framepointers.\n");
710 } else {
711 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
712 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
713 PERF_SAMPLE_BRANCH_CALL_STACK |
714 PERF_SAMPLE_BRANCH_NO_CYCLES |
715 PERF_SAMPLE_BRANCH_NO_FLAGS |
716 PERF_SAMPLE_BRANCH_HW_INDEX;
717 }
718 } else
719 pr_warning("Cannot use LBR callstack with branch stack. "
720 "Falling back to framepointers.\n");
721 }
722
723 if (param->record_mode == CALLCHAIN_DWARF) {
724 if (!function) {
725 perf_evsel__set_sample_bit(evsel, REGS_USER);
726 perf_evsel__set_sample_bit(evsel, STACK_USER);
727 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
728 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
729 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
730 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
731 "so the minimal registers set (IP, SP) is explicitly forced.\n");
732 } else {
733 attr->sample_regs_user |= PERF_REGS_MASK;
734 }
735 attr->sample_stack_user = param->dump_size;
736 attr->exclude_callchain_user = 1;
737 } else {
738 pr_info("Cannot use DWARF unwind for function trace event,"
739 " falling back to framepointers.\n");
740 }
741 }
742
743 if (function) {
744 pr_info("Disabling user space callchains for function trace event.\n");
745 attr->exclude_callchain_user = 1;
746 }
747 }
748
749 void perf_evsel__config_callchain(struct evsel *evsel,
750 struct record_opts *opts,
751 struct callchain_param *param)
752 {
753 if (param->enabled)
754 return __perf_evsel__config_callchain(evsel, opts, param);
755 }
756
757 static void
758 perf_evsel__reset_callgraph(struct evsel *evsel,
759 struct callchain_param *param)
760 {
761 struct perf_event_attr *attr = &evsel->core.attr;
762
763 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
764 if (param->record_mode == CALLCHAIN_LBR) {
765 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
766 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
767 PERF_SAMPLE_BRANCH_CALL_STACK |
768 PERF_SAMPLE_BRANCH_HW_INDEX);
769 }
770 if (param->record_mode == CALLCHAIN_DWARF) {
771 perf_evsel__reset_sample_bit(evsel, REGS_USER);
772 perf_evsel__reset_sample_bit(evsel, STACK_USER);
773 }
774 }
775
776 static void apply_config_terms(struct evsel *evsel,
777 struct record_opts *opts, bool track)
778 {
779 struct perf_evsel_config_term *term;
780 struct list_head *config_terms = &evsel->config_terms;
781 struct perf_event_attr *attr = &evsel->core.attr;
782 /* callgraph default */
783 struct callchain_param param = {
784 .record_mode = callchain_param.record_mode,
785 };
786 u32 dump_size = 0;
787 int max_stack = 0;
788 const char *callgraph_buf = NULL;
789
790 list_for_each_entry(term, config_terms, list) {
791 switch (term->type) {
792 case PERF_EVSEL__CONFIG_TERM_PERIOD:
793 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
794 attr->sample_period = term->val.period;
795 attr->freq = 0;
796 perf_evsel__reset_sample_bit(evsel, PERIOD);
797 }
798 break;
799 case PERF_EVSEL__CONFIG_TERM_FREQ:
800 if (!(term->weak && opts->user_freq != UINT_MAX)) {
801 attr->sample_freq = term->val.freq;
802 attr->freq = 1;
803 perf_evsel__set_sample_bit(evsel, PERIOD);
804 }
805 break;
806 case PERF_EVSEL__CONFIG_TERM_TIME:
807 if (term->val.time)
808 perf_evsel__set_sample_bit(evsel, TIME);
809 else
810 perf_evsel__reset_sample_bit(evsel, TIME);
811 break;
812 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
813 callgraph_buf = term->val.str;
814 break;
815 case PERF_EVSEL__CONFIG_TERM_BRANCH:
816 if (term->val.str && strcmp(term->val.str, "no")) {
817 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
818 parse_branch_str(term->val.str,
819 &attr->branch_sample_type);
820 } else
821 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
822 break;
823 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
824 dump_size = term->val.stack_user;
825 break;
826 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
827 max_stack = term->val.max_stack;
828 break;
829 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
830 evsel->max_events = term->val.max_events;
831 break;
832 case PERF_EVSEL__CONFIG_TERM_INHERIT:
833 /*
834 * attr->inherit should has already been set by
835 * perf_evsel__config. If user explicitly set
836 * inherit using config terms, override global
837 * opt->no_inherit setting.
838 */
839 attr->inherit = term->val.inherit ? 1 : 0;
840 break;
841 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
842 attr->write_backward = term->val.overwrite ? 1 : 0;
843 break;
844 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
845 break;
846 case PERF_EVSEL__CONFIG_TERM_PERCORE:
847 break;
848 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
849 attr->aux_output = term->val.aux_output ? 1 : 0;
850 break;
851 case PERF_EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
852 /* Already applied by auxtrace */
853 break;
854 case PERF_EVSEL__CONFIG_TERM_CFG_CHG:
855 break;
856 default:
857 break;
858 }
859 }
860
861 /* User explicitly set per-event callgraph, clear the old setting and reset. */
862 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
863 bool sample_address = false;
864
865 if (max_stack) {
866 param.max_stack = max_stack;
867 if (callgraph_buf == NULL)
868 callgraph_buf = "fp";
869 }
870
871 /* parse callgraph parameters */
872 if (callgraph_buf != NULL) {
873 if (!strcmp(callgraph_buf, "no")) {
874 param.enabled = false;
875 param.record_mode = CALLCHAIN_NONE;
876 } else {
877 param.enabled = true;
878 if (parse_callchain_record(callgraph_buf, &param)) {
879 pr_err("per-event callgraph setting for %s failed. "
880 "Apply callgraph global setting for it\n",
881 evsel->name);
882 return;
883 }
884 if (param.record_mode == CALLCHAIN_DWARF)
885 sample_address = true;
886 }
887 }
888 if (dump_size > 0) {
889 dump_size = round_up(dump_size, sizeof(u64));
890 param.dump_size = dump_size;
891 }
892
893 /* If global callgraph set, clear it */
894 if (callchain_param.enabled)
895 perf_evsel__reset_callgraph(evsel, &callchain_param);
896
897 /* set perf-event callgraph */
898 if (param.enabled) {
899 if (sample_address) {
900 perf_evsel__set_sample_bit(evsel, ADDR);
901 perf_evsel__set_sample_bit(evsel, DATA_SRC);
902 evsel->core.attr.mmap_data = track;
903 }
904 perf_evsel__config_callchain(evsel, opts, &param);
905 }
906 }
907 }
908
909 static bool is_dummy_event(struct evsel *evsel)
910 {
911 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
912 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
913 }
914
915 struct perf_evsel_config_term *__perf_evsel__get_config_term(struct evsel *evsel,
916 enum evsel_term_type type)
917 {
918 struct perf_evsel_config_term *term, *found_term = NULL;
919
920 list_for_each_entry(term, &evsel->config_terms, list) {
921 if (term->type == type)
922 found_term = term;
923 }
924
925 return found_term;
926 }
927
928 /*
929 * The enable_on_exec/disabled value strategy:
930 *
931 * 1) For any type of traced program:
932 * - all independent events and group leaders are disabled
933 * - all group members are enabled
934 *
935 * Group members are ruled by group leaders. They need to
936 * be enabled, because the group scheduling relies on that.
937 *
938 * 2) For traced programs executed by perf:
939 * - all independent events and group leaders have
940 * enable_on_exec set
941 * - we don't specifically enable or disable any event during
942 * the record command
943 *
944 * Independent events and group leaders are initially disabled
945 * and get enabled by exec. Group members are ruled by group
946 * leaders as stated in 1).
947 *
948 * 3) For traced programs attached by perf (pid/tid):
949 * - we specifically enable or disable all events during
950 * the record command
951 *
952 * When attaching events to already running traced we
953 * enable/disable events specifically, as there's no
954 * initial traced exec call.
955 */
956 void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
957 struct callchain_param *callchain)
958 {
959 struct evsel *leader = evsel->leader;
960 struct perf_event_attr *attr = &evsel->core.attr;
961 int track = evsel->tracking;
962 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
963
964 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
965 attr->inherit = !opts->no_inherit;
966 attr->write_backward = opts->overwrite ? 1 : 0;
967
968 perf_evsel__set_sample_bit(evsel, IP);
969 perf_evsel__set_sample_bit(evsel, TID);
970
971 if (evsel->sample_read) {
972 perf_evsel__set_sample_bit(evsel, READ);
973
974 /*
975 * We need ID even in case of single event, because
976 * PERF_SAMPLE_READ process ID specific data.
977 */
978 perf_evsel__set_sample_id(evsel, false);
979
980 /*
981 * Apply group format only if we belong to group
982 * with more than one members.
983 */
984 if (leader->core.nr_members > 1) {
985 attr->read_format |= PERF_FORMAT_GROUP;
986 attr->inherit = 0;
987 }
988 }
989
990 /*
991 * We default some events to have a default interval. But keep
992 * it a weak assumption overridable by the user.
993 */
994 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
995 opts->user_interval != ULLONG_MAX)) {
996 if (opts->freq) {
997 perf_evsel__set_sample_bit(evsel, PERIOD);
998 attr->freq = 1;
999 attr->sample_freq = opts->freq;
1000 } else {
1001 attr->sample_period = opts->default_interval;
1002 }
1003 }
1004
1005 /*
1006 * Disable sampling for all group members other
1007 * than leader in case leader 'leads' the sampling.
1008 */
1009 if ((leader != evsel) && leader->sample_read) {
1010 attr->freq = 0;
1011 attr->sample_freq = 0;
1012 attr->sample_period = 0;
1013 attr->write_backward = 0;
1014
1015 /*
1016 * We don't get sample for slave events, we make them
1017 * when delivering group leader sample. Set the slave
1018 * event to follow the master sample_type to ease up
1019 * report.
1020 */
1021 attr->sample_type = leader->core.attr.sample_type;
1022 }
1023
1024 if (opts->no_samples)
1025 attr->sample_freq = 0;
1026
1027 if (opts->inherit_stat) {
1028 evsel->core.attr.read_format |=
1029 PERF_FORMAT_TOTAL_TIME_ENABLED |
1030 PERF_FORMAT_TOTAL_TIME_RUNNING |
1031 PERF_FORMAT_ID;
1032 attr->inherit_stat = 1;
1033 }
1034
1035 if (opts->sample_address) {
1036 perf_evsel__set_sample_bit(evsel, ADDR);
1037 attr->mmap_data = track;
1038 }
1039
1040 /*
1041 * We don't allow user space callchains for function trace
1042 * event, due to issues with page faults while tracing page
1043 * fault handler and its overall trickiness nature.
1044 */
1045 if (perf_evsel__is_function_event(evsel))
1046 evsel->core.attr.exclude_callchain_user = 1;
1047
1048 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1049 perf_evsel__config_callchain(evsel, opts, callchain);
1050
1051 if (opts->sample_intr_regs) {
1052 attr->sample_regs_intr = opts->sample_intr_regs;
1053 perf_evsel__set_sample_bit(evsel, REGS_INTR);
1054 }
1055
1056 if (opts->sample_user_regs) {
1057 attr->sample_regs_user |= opts->sample_user_regs;
1058 perf_evsel__set_sample_bit(evsel, REGS_USER);
1059 }
1060
1061 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1062 perf_evsel__set_sample_bit(evsel, CPU);
1063
1064 /*
1065 * When the user explicitly disabled time don't force it here.
1066 */
1067 if (opts->sample_time &&
1068 (!perf_missing_features.sample_id_all &&
1069 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1070 opts->sample_time_set)))
1071 perf_evsel__set_sample_bit(evsel, TIME);
1072
1073 if (opts->raw_samples && !evsel->no_aux_samples) {
1074 perf_evsel__set_sample_bit(evsel, TIME);
1075 perf_evsel__set_sample_bit(evsel, RAW);
1076 perf_evsel__set_sample_bit(evsel, CPU);
1077 }
1078
1079 if (opts->sample_address)
1080 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1081
1082 if (opts->sample_phys_addr)
1083 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1084
1085 if (opts->no_buffering) {
1086 attr->watermark = 0;
1087 attr->wakeup_events = 1;
1088 }
1089 if (opts->branch_stack && !evsel->no_aux_samples) {
1090 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1091 attr->branch_sample_type = opts->branch_stack;
1092 }
1093
1094 if (opts->sample_weight)
1095 perf_evsel__set_sample_bit(evsel, WEIGHT);
1096
1097 attr->task = track;
1098 attr->mmap = track;
1099 attr->mmap2 = track && !perf_missing_features.mmap2;
1100 attr->comm = track;
1101 attr->ksymbol = track && !perf_missing_features.ksymbol;
1102 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1103
1104 if (opts->record_namespaces)
1105 attr->namespaces = track;
1106
1107 if (opts->record_cgroup) {
1108 attr->cgroup = track && !perf_missing_features.cgroup;
1109 perf_evsel__set_sample_bit(evsel, CGROUP);
1110 }
1111
1112 if (opts->record_switch_events)
1113 attr->context_switch = track;
1114
1115 if (opts->sample_transaction)
1116 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1117
1118 if (opts->running_time) {
1119 evsel->core.attr.read_format |=
1120 PERF_FORMAT_TOTAL_TIME_ENABLED |
1121 PERF_FORMAT_TOTAL_TIME_RUNNING;
1122 }
1123
1124 /*
1125 * XXX see the function comment above
1126 *
1127 * Disabling only independent events or group leaders,
1128 * keeping group members enabled.
1129 */
1130 if (perf_evsel__is_group_leader(evsel))
1131 attr->disabled = 1;
1132
1133 /*
1134 * Setting enable_on_exec for independent events and
1135 * group leaders for traced executed by perf.
1136 */
1137 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1138 !opts->initial_delay)
1139 attr->enable_on_exec = 1;
1140
1141 if (evsel->immediate) {
1142 attr->disabled = 0;
1143 attr->enable_on_exec = 0;
1144 }
1145
1146 clockid = opts->clockid;
1147 if (opts->use_clockid) {
1148 attr->use_clockid = 1;
1149 attr->clockid = opts->clockid;
1150 }
1151
1152 if (evsel->precise_max)
1153 attr->precise_ip = 3;
1154
1155 if (opts->all_user) {
1156 attr->exclude_kernel = 1;
1157 attr->exclude_user = 0;
1158 }
1159
1160 if (opts->all_kernel) {
1161 attr->exclude_kernel = 0;
1162 attr->exclude_user = 1;
1163 }
1164
1165 if (evsel->core.own_cpus || evsel->unit)
1166 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1167
1168 /*
1169 * Apply event specific term settings,
1170 * it overloads any global configuration.
1171 */
1172 apply_config_terms(evsel, opts, track);
1173
1174 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1175
1176 /* The --period option takes the precedence. */
1177 if (opts->period_set) {
1178 if (opts->period)
1179 perf_evsel__set_sample_bit(evsel, PERIOD);
1180 else
1181 perf_evsel__reset_sample_bit(evsel, PERIOD);
1182 }
1183
1184 /*
1185 * For initial_delay, a dummy event is added implicitly.
1186 * The software event will trigger -EOPNOTSUPP error out,
1187 * if BRANCH_STACK bit is set.
1188 */
1189 if (opts->initial_delay && is_dummy_event(evsel))
1190 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1191 }
1192
1193 int perf_evsel__set_filter(struct evsel *evsel, const char *filter)
1194 {
1195 char *new_filter = strdup(filter);
1196
1197 if (new_filter != NULL) {
1198 free(evsel->filter);
1199 evsel->filter = new_filter;
1200 return 0;
1201 }
1202
1203 return -1;
1204 }
1205
1206 static int perf_evsel__append_filter(struct evsel *evsel,
1207 const char *fmt, const char *filter)
1208 {
1209 char *new_filter;
1210
1211 if (evsel->filter == NULL)
1212 return perf_evsel__set_filter(evsel, filter);
1213
1214 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1215 free(evsel->filter);
1216 evsel->filter = new_filter;
1217 return 0;
1218 }
1219
1220 return -1;
1221 }
1222
1223 int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1224 {
1225 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1226 }
1227
1228 int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1229 {
1230 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1231 }
1232
1233 /* Caller has to clear disabled after going through all CPUs. */
1234 int evsel__enable_cpu(struct evsel *evsel, int cpu)
1235 {
1236 return perf_evsel__enable_cpu(&evsel->core, cpu);
1237 }
1238
1239 int evsel__enable(struct evsel *evsel)
1240 {
1241 int err = perf_evsel__enable(&evsel->core);
1242
1243 if (!err)
1244 evsel->disabled = false;
1245 return err;
1246 }
1247
1248 /* Caller has to set disabled after going through all CPUs. */
1249 int evsel__disable_cpu(struct evsel *evsel, int cpu)
1250 {
1251 return perf_evsel__disable_cpu(&evsel->core, cpu);
1252 }
1253
1254 int evsel__disable(struct evsel *evsel)
1255 {
1256 int err = perf_evsel__disable(&evsel->core);
1257 /*
1258 * We mark it disabled here so that tools that disable a event can
1259 * ignore events after they disable it. I.e. the ring buffer may have
1260 * already a few more events queued up before the kernel got the stop
1261 * request.
1262 */
1263 if (!err)
1264 evsel->disabled = true;
1265
1266 return err;
1267 }
1268
1269 static void perf_evsel__free_config_terms(struct evsel *evsel)
1270 {
1271 struct perf_evsel_config_term *term, *h;
1272
1273 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1274 list_del_init(&term->list);
1275 if (term->free_str)
1276 zfree(&term->val.str);
1277 free(term);
1278 }
1279 }
1280
1281 void perf_evsel__exit(struct evsel *evsel)
1282 {
1283 assert(list_empty(&evsel->core.node));
1284 assert(evsel->evlist == NULL);
1285 perf_evsel__free_counts(evsel);
1286 perf_evsel__free_fd(&evsel->core);
1287 perf_evsel__free_id(&evsel->core);
1288 perf_evsel__free_config_terms(evsel);
1289 cgroup__put(evsel->cgrp);
1290 perf_cpu_map__put(evsel->core.cpus);
1291 perf_cpu_map__put(evsel->core.own_cpus);
1292 perf_thread_map__put(evsel->core.threads);
1293 zfree(&evsel->group_name);
1294 zfree(&evsel->name);
1295 zfree(&evsel->pmu_name);
1296 perf_evsel__object.fini(evsel);
1297 }
1298
1299 void evsel__delete(struct evsel *evsel)
1300 {
1301 perf_evsel__exit(evsel);
1302 free(evsel);
1303 }
1304
1305 void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1306 struct perf_counts_values *count)
1307 {
1308 struct perf_counts_values tmp;
1309
1310 if (!evsel->prev_raw_counts)
1311 return;
1312
1313 if (cpu == -1) {
1314 tmp = evsel->prev_raw_counts->aggr;
1315 evsel->prev_raw_counts->aggr = *count;
1316 } else {
1317 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1318 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1319 }
1320
1321 count->val = count->val - tmp.val;
1322 count->ena = count->ena - tmp.ena;
1323 count->run = count->run - tmp.run;
1324 }
1325
1326 void perf_counts_values__scale(struct perf_counts_values *count,
1327 bool scale, s8 *pscaled)
1328 {
1329 s8 scaled = 0;
1330
1331 if (scale) {
1332 if (count->run == 0) {
1333 scaled = -1;
1334 count->val = 0;
1335 } else if (count->run < count->ena) {
1336 scaled = 1;
1337 count->val = (u64)((double) count->val * count->ena / count->run);
1338 }
1339 }
1340
1341 if (pscaled)
1342 *pscaled = scaled;
1343 }
1344
1345 static int
1346 perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
1347 {
1348 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1349
1350 return perf_evsel__read(&evsel->core, cpu, thread, count);
1351 }
1352
1353 static void
1354 perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1355 u64 val, u64 ena, u64 run)
1356 {
1357 struct perf_counts_values *count;
1358
1359 count = perf_counts(counter->counts, cpu, thread);
1360
1361 count->val = val;
1362 count->ena = ena;
1363 count->run = run;
1364
1365 perf_counts__set_loaded(counter->counts, cpu, thread, true);
1366 }
1367
1368 static int
1369 perf_evsel__process_group_data(struct evsel *leader,
1370 int cpu, int thread, u64 *data)
1371 {
1372 u64 read_format = leader->core.attr.read_format;
1373 struct sample_read_value *v;
1374 u64 nr, ena = 0, run = 0, i;
1375
1376 nr = *data++;
1377
1378 if (nr != (u64) leader->core.nr_members)
1379 return -EINVAL;
1380
1381 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1382 ena = *data++;
1383
1384 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1385 run = *data++;
1386
1387 v = (struct sample_read_value *) data;
1388
1389 perf_evsel__set_count(leader, cpu, thread,
1390 v[0].value, ena, run);
1391
1392 for (i = 1; i < nr; i++) {
1393 struct evsel *counter;
1394
1395 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1396 if (!counter)
1397 return -EINVAL;
1398
1399 perf_evsel__set_count(counter, cpu, thread,
1400 v[i].value, ena, run);
1401 }
1402
1403 return 0;
1404 }
1405
1406 static int
1407 perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
1408 {
1409 struct perf_stat_evsel *ps = leader->stats;
1410 u64 read_format = leader->core.attr.read_format;
1411 int size = perf_evsel__read_size(&leader->core);
1412 u64 *data = ps->group_data;
1413
1414 if (!(read_format & PERF_FORMAT_ID))
1415 return -EINVAL;
1416
1417 if (!perf_evsel__is_group_leader(leader))
1418 return -EINVAL;
1419
1420 if (!data) {
1421 data = zalloc(size);
1422 if (!data)
1423 return -ENOMEM;
1424
1425 ps->group_data = data;
1426 }
1427
1428 if (FD(leader, cpu, thread) < 0)
1429 return -EINVAL;
1430
1431 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1432 return -errno;
1433
1434 return perf_evsel__process_group_data(leader, cpu, thread, data);
1435 }
1436
1437 int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1438 {
1439 u64 read_format = evsel->core.attr.read_format;
1440
1441 if (read_format & PERF_FORMAT_GROUP)
1442 return perf_evsel__read_group(evsel, cpu, thread);
1443 else
1444 return perf_evsel__read_one(evsel, cpu, thread);
1445 }
1446
1447 int __perf_evsel__read_on_cpu(struct evsel *evsel,
1448 int cpu, int thread, bool scale)
1449 {
1450 struct perf_counts_values count;
1451 size_t nv = scale ? 3 : 1;
1452
1453 if (FD(evsel, cpu, thread) < 0)
1454 return -EINVAL;
1455
1456 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1457 return -ENOMEM;
1458
1459 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1460 return -errno;
1461
1462 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1463 perf_counts_values__scale(&count, scale, NULL);
1464 *perf_counts(evsel->counts, cpu, thread) = count;
1465 return 0;
1466 }
1467
1468 static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1469 {
1470 struct evsel *leader = evsel->leader;
1471 int fd;
1472
1473 if (perf_evsel__is_group_leader(evsel))
1474 return -1;
1475
1476 /*
1477 * Leader must be already processed/open,
1478 * if not it's a bug.
1479 */
1480 BUG_ON(!leader->core.fd);
1481
1482 fd = FD(leader, cpu, thread);
1483 BUG_ON(fd == -1);
1484
1485 return fd;
1486 }
1487
1488 static void perf_evsel__remove_fd(struct evsel *pos,
1489 int nr_cpus, int nr_threads,
1490 int thread_idx)
1491 {
1492 for (int cpu = 0; cpu < nr_cpus; cpu++)
1493 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1494 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1495 }
1496
1497 static int update_fds(struct evsel *evsel,
1498 int nr_cpus, int cpu_idx,
1499 int nr_threads, int thread_idx)
1500 {
1501 struct evsel *pos;
1502
1503 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1504 return -EINVAL;
1505
1506 evlist__for_each_entry(evsel->evlist, pos) {
1507 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1508
1509 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1510
1511 /*
1512 * Since fds for next evsel has not been created,
1513 * there is no need to iterate whole event list.
1514 */
1515 if (pos == evsel)
1516 break;
1517 }
1518 return 0;
1519 }
1520
1521 static bool ignore_missing_thread(struct evsel *evsel,
1522 int nr_cpus, int cpu,
1523 struct perf_thread_map *threads,
1524 int thread, int err)
1525 {
1526 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1527
1528 if (!evsel->ignore_missing_thread)
1529 return false;
1530
1531 /* The system wide setup does not work with threads. */
1532 if (evsel->core.system_wide)
1533 return false;
1534
1535 /* The -ESRCH is perf event syscall errno for pid's not found. */
1536 if (err != -ESRCH)
1537 return false;
1538
1539 /* If there's only one thread, let it fail. */
1540 if (threads->nr == 1)
1541 return false;
1542
1543 /*
1544 * We should remove fd for missing_thread first
1545 * because thread_map__remove() will decrease threads->nr.
1546 */
1547 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1548 return false;
1549
1550 if (thread_map__remove(threads, thread))
1551 return false;
1552
1553 pr_warning("WARNING: Ignored open failure for pid %d\n",
1554 ignore_pid);
1555 return true;
1556 }
1557
1558 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1559 void *priv __maybe_unused)
1560 {
1561 return fprintf(fp, " %-32s %s\n", name, val);
1562 }
1563
1564 static void display_attr(struct perf_event_attr *attr)
1565 {
1566 if (verbose >= 2 || debug_peo_args) {
1567 fprintf(stderr, "%.60s\n", graph_dotted_line);
1568 fprintf(stderr, "perf_event_attr:\n");
1569 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1570 fprintf(stderr, "%.60s\n", graph_dotted_line);
1571 }
1572 }
1573
1574 static int perf_event_open(struct evsel *evsel,
1575 pid_t pid, int cpu, int group_fd,
1576 unsigned long flags)
1577 {
1578 int precise_ip = evsel->core.attr.precise_ip;
1579 int fd;
1580
1581 while (1) {
1582 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1583 pid, cpu, group_fd, flags);
1584
1585 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1586 if (fd >= 0)
1587 break;
1588
1589 /* Do not try less precise if not requested. */
1590 if (!evsel->precise_max)
1591 break;
1592
1593 /*
1594 * We tried all the precise_ip values, and it's
1595 * still failing, so leave it to standard fallback.
1596 */
1597 if (!evsel->core.attr.precise_ip) {
1598 evsel->core.attr.precise_ip = precise_ip;
1599 break;
1600 }
1601
1602 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1603 evsel->core.attr.precise_ip--;
1604 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1605 display_attr(&evsel->core.attr);
1606 }
1607
1608 return fd;
1609 }
1610
1611 static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
1612 struct perf_thread_map *threads,
1613 int start_cpu, int end_cpu)
1614 {
1615 int cpu, thread, nthreads;
1616 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1617 int pid = -1, err, old_errno;
1618 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1619
1620 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1621 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1622 return -EINVAL;
1623
1624 if (cpus == NULL) {
1625 static struct perf_cpu_map *empty_cpu_map;
1626
1627 if (empty_cpu_map == NULL) {
1628 empty_cpu_map = perf_cpu_map__dummy_new();
1629 if (empty_cpu_map == NULL)
1630 return -ENOMEM;
1631 }
1632
1633 cpus = empty_cpu_map;
1634 }
1635
1636 if (threads == NULL) {
1637 static struct perf_thread_map *empty_thread_map;
1638
1639 if (empty_thread_map == NULL) {
1640 empty_thread_map = thread_map__new_by_tid(-1);
1641 if (empty_thread_map == NULL)
1642 return -ENOMEM;
1643 }
1644
1645 threads = empty_thread_map;
1646 }
1647
1648 if (evsel->core.system_wide)
1649 nthreads = 1;
1650 else
1651 nthreads = threads->nr;
1652
1653 if (evsel->core.fd == NULL &&
1654 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1655 return -ENOMEM;
1656
1657 if (evsel->cgrp) {
1658 flags |= PERF_FLAG_PID_CGROUP;
1659 pid = evsel->cgrp->fd;
1660 }
1661
1662 fallback_missing_features:
1663 if (perf_missing_features.clockid_wrong)
1664 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1665 if (perf_missing_features.clockid) {
1666 evsel->core.attr.use_clockid = 0;
1667 evsel->core.attr.clockid = 0;
1668 }
1669 if (perf_missing_features.cloexec)
1670 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1671 if (perf_missing_features.mmap2)
1672 evsel->core.attr.mmap2 = 0;
1673 if (perf_missing_features.exclude_guest)
1674 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1675 if (perf_missing_features.lbr_flags)
1676 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1677 PERF_SAMPLE_BRANCH_NO_CYCLES);
1678 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1679 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1680 if (perf_missing_features.ksymbol)
1681 evsel->core.attr.ksymbol = 0;
1682 if (perf_missing_features.bpf)
1683 evsel->core.attr.bpf_event = 0;
1684 if (perf_missing_features.branch_hw_idx)
1685 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1686 retry_sample_id:
1687 if (perf_missing_features.sample_id_all)
1688 evsel->core.attr.sample_id_all = 0;
1689
1690 display_attr(&evsel->core.attr);
1691
1692 for (cpu = start_cpu; cpu < end_cpu; cpu++) {
1693
1694 for (thread = 0; thread < nthreads; thread++) {
1695 int fd, group_fd;
1696
1697 if (!evsel->cgrp && !evsel->core.system_wide)
1698 pid = perf_thread_map__pid(threads, thread);
1699
1700 group_fd = get_group_fd(evsel, cpu, thread);
1701 retry_open:
1702 test_attr__ready();
1703
1704 fd = perf_event_open(evsel, pid, cpus->map[cpu],
1705 group_fd, flags);
1706
1707 FD(evsel, cpu, thread) = fd;
1708
1709 if (fd < 0) {
1710 err = -errno;
1711
1712 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1713 /*
1714 * We just removed 1 thread, so take a step
1715 * back on thread index and lower the upper
1716 * nthreads limit.
1717 */
1718 nthreads--;
1719 thread--;
1720
1721 /* ... and pretend like nothing have happened. */
1722 err = 0;
1723 continue;
1724 }
1725
1726 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
1727 err);
1728 goto try_fallback;
1729 }
1730
1731 pr_debug2_peo(" = %d\n", fd);
1732
1733 if (evsel->bpf_fd >= 0) {
1734 int evt_fd = fd;
1735 int bpf_fd = evsel->bpf_fd;
1736
1737 err = ioctl(evt_fd,
1738 PERF_EVENT_IOC_SET_BPF,
1739 bpf_fd);
1740 if (err && errno != EEXIST) {
1741 pr_err("failed to attach bpf fd %d: %s\n",
1742 bpf_fd, strerror(errno));
1743 err = -EINVAL;
1744 goto out_close;
1745 }
1746 }
1747
1748 set_rlimit = NO_CHANGE;
1749
1750 /*
1751 * If we succeeded but had to kill clockid, fail and
1752 * have perf_evsel__open_strerror() print us a nice
1753 * error.
1754 */
1755 if (perf_missing_features.clockid ||
1756 perf_missing_features.clockid_wrong) {
1757 err = -EINVAL;
1758 goto out_close;
1759 }
1760 }
1761 }
1762
1763 return 0;
1764
1765 try_fallback:
1766 /*
1767 * perf stat needs between 5 and 22 fds per CPU. When we run out
1768 * of them try to increase the limits.
1769 */
1770 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1771 struct rlimit l;
1772
1773 old_errno = errno;
1774 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1775 if (set_rlimit == NO_CHANGE)
1776 l.rlim_cur = l.rlim_max;
1777 else {
1778 l.rlim_cur = l.rlim_max + 1000;
1779 l.rlim_max = l.rlim_cur;
1780 }
1781 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1782 set_rlimit++;
1783 errno = old_errno;
1784 goto retry_open;
1785 }
1786 }
1787 errno = old_errno;
1788 }
1789
1790 if (err != -EINVAL || cpu > 0 || thread > 0)
1791 goto out_close;
1792
1793 /*
1794 * Must probe features in the order they were added to the
1795 * perf_event_attr interface.
1796 */
1797 if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1798 perf_missing_features.cgroup = true;
1799 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1800 goto out_close;
1801 } else if (!perf_missing_features.branch_hw_idx &&
1802 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1803 perf_missing_features.branch_hw_idx = true;
1804 pr_debug2("switching off branch HW index support\n");
1805 goto fallback_missing_features;
1806 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1807 perf_missing_features.aux_output = true;
1808 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1809 goto out_close;
1810 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1811 perf_missing_features.bpf = true;
1812 pr_debug2_peo("switching off bpf_event\n");
1813 goto fallback_missing_features;
1814 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1815 perf_missing_features.ksymbol = true;
1816 pr_debug2_peo("switching off ksymbol\n");
1817 goto fallback_missing_features;
1818 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1819 perf_missing_features.write_backward = true;
1820 pr_debug2_peo("switching off write_backward\n");
1821 goto out_close;
1822 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1823 perf_missing_features.clockid_wrong = true;
1824 pr_debug2_peo("switching off clockid\n");
1825 goto fallback_missing_features;
1826 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1827 perf_missing_features.clockid = true;
1828 pr_debug2_peo("switching off use_clockid\n");
1829 goto fallback_missing_features;
1830 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1831 perf_missing_features.cloexec = true;
1832 pr_debug2_peo("switching off cloexec flag\n");
1833 goto fallback_missing_features;
1834 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1835 perf_missing_features.mmap2 = true;
1836 pr_debug2_peo("switching off mmap2\n");
1837 goto fallback_missing_features;
1838 } else if (!perf_missing_features.exclude_guest &&
1839 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1840 perf_missing_features.exclude_guest = true;
1841 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1842 goto fallback_missing_features;
1843 } else if (!perf_missing_features.sample_id_all) {
1844 perf_missing_features.sample_id_all = true;
1845 pr_debug2_peo("switching off sample_id_all\n");
1846 goto retry_sample_id;
1847 } else if (!perf_missing_features.lbr_flags &&
1848 (evsel->core.attr.branch_sample_type &
1849 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1850 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1851 perf_missing_features.lbr_flags = true;
1852 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1853 goto fallback_missing_features;
1854 } else if (!perf_missing_features.group_read &&
1855 evsel->core.attr.inherit &&
1856 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1857 perf_evsel__is_group_leader(evsel)) {
1858 perf_missing_features.group_read = true;
1859 pr_debug2_peo("switching off group read\n");
1860 goto fallback_missing_features;
1861 }
1862 out_close:
1863 if (err)
1864 threads->err_thread = thread;
1865
1866 old_errno = errno;
1867 do {
1868 while (--thread >= 0) {
1869 if (FD(evsel, cpu, thread) >= 0)
1870 close(FD(evsel, cpu, thread));
1871 FD(evsel, cpu, thread) = -1;
1872 }
1873 thread = nthreads;
1874 } while (--cpu >= 0);
1875 errno = old_errno;
1876 return err;
1877 }
1878
1879 int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
1880 struct perf_thread_map *threads)
1881 {
1882 return evsel__open_cpu(evsel, cpus, threads, 0, cpus ? cpus->nr : 1);
1883 }
1884
1885 void evsel__close(struct evsel *evsel)
1886 {
1887 perf_evsel__close(&evsel->core);
1888 perf_evsel__free_id(&evsel->core);
1889 }
1890
1891 int perf_evsel__open_per_cpu(struct evsel *evsel,
1892 struct perf_cpu_map *cpus,
1893 int cpu)
1894 {
1895 if (cpu == -1)
1896 return evsel__open_cpu(evsel, cpus, NULL, 0,
1897 cpus ? cpus->nr : 1);
1898
1899 return evsel__open_cpu(evsel, cpus, NULL, cpu, cpu + 1);
1900 }
1901
1902 int perf_evsel__open_per_thread(struct evsel *evsel,
1903 struct perf_thread_map *threads)
1904 {
1905 return evsel__open(evsel, NULL, threads);
1906 }
1907
1908 static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1909 const union perf_event *event,
1910 struct perf_sample *sample)
1911 {
1912 u64 type = evsel->core.attr.sample_type;
1913 const __u64 *array = event->sample.array;
1914 bool swapped = evsel->needs_swap;
1915 union u64_swap u;
1916
1917 array += ((event->header.size -
1918 sizeof(event->header)) / sizeof(u64)) - 1;
1919
1920 if (type & PERF_SAMPLE_IDENTIFIER) {
1921 sample->id = *array;
1922 array--;
1923 }
1924
1925 if (type & PERF_SAMPLE_CPU) {
1926 u.val64 = *array;
1927 if (swapped) {
1928 /* undo swap of u64, then swap on individual u32s */
1929 u.val64 = bswap_64(u.val64);
1930 u.val32[0] = bswap_32(u.val32[0]);
1931 }
1932
1933 sample->cpu = u.val32[0];
1934 array--;
1935 }
1936
1937 if (type & PERF_SAMPLE_STREAM_ID) {
1938 sample->stream_id = *array;
1939 array--;
1940 }
1941
1942 if (type & PERF_SAMPLE_ID) {
1943 sample->id = *array;
1944 array--;
1945 }
1946
1947 if (type & PERF_SAMPLE_TIME) {
1948 sample->time = *array;
1949 array--;
1950 }
1951
1952 if (type & PERF_SAMPLE_TID) {
1953 u.val64 = *array;
1954 if (swapped) {
1955 /* undo swap of u64, then swap on individual u32s */
1956 u.val64 = bswap_64(u.val64);
1957 u.val32[0] = bswap_32(u.val32[0]);
1958 u.val32[1] = bswap_32(u.val32[1]);
1959 }
1960
1961 sample->pid = u.val32[0];
1962 sample->tid = u.val32[1];
1963 array--;
1964 }
1965
1966 return 0;
1967 }
1968
1969 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1970 u64 size)
1971 {
1972 return size > max_size || offset + size > endp;
1973 }
1974
1975 #define OVERFLOW_CHECK(offset, size, max_size) \
1976 do { \
1977 if (overflow(endp, (max_size), (offset), (size))) \
1978 return -EFAULT; \
1979 } while (0)
1980
1981 #define OVERFLOW_CHECK_u64(offset) \
1982 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1983
1984 static int
1985 perf_event__check_size(union perf_event *event, unsigned int sample_size)
1986 {
1987 /*
1988 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1989 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1990 * check the format does not go past the end of the event.
1991 */
1992 if (sample_size + sizeof(event->header) > event->header.size)
1993 return -EFAULT;
1994
1995 return 0;
1996 }
1997
1998 int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1999 struct perf_sample *data)
2000 {
2001 u64 type = evsel->core.attr.sample_type;
2002 bool swapped = evsel->needs_swap;
2003 const __u64 *array;
2004 u16 max_size = event->header.size;
2005 const void *endp = (void *)event + max_size;
2006 u64 sz;
2007
2008 /*
2009 * used for cross-endian analysis. See git commit 65014ab3
2010 * for why this goofiness is needed.
2011 */
2012 union u64_swap u;
2013
2014 memset(data, 0, sizeof(*data));
2015 data->cpu = data->pid = data->tid = -1;
2016 data->stream_id = data->id = data->time = -1ULL;
2017 data->period = evsel->core.attr.sample_period;
2018 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2019 data->misc = event->header.misc;
2020 data->id = -1ULL;
2021 data->data_src = PERF_MEM_DATA_SRC_NONE;
2022
2023 if (event->header.type != PERF_RECORD_SAMPLE) {
2024 if (!evsel->core.attr.sample_id_all)
2025 return 0;
2026 return perf_evsel__parse_id_sample(evsel, event, data);
2027 }
2028
2029 array = event->sample.array;
2030
2031 if (perf_event__check_size(event, evsel->sample_size))
2032 return -EFAULT;
2033
2034 if (type & PERF_SAMPLE_IDENTIFIER) {
2035 data->id = *array;
2036 array++;
2037 }
2038
2039 if (type & PERF_SAMPLE_IP) {
2040 data->ip = *array;
2041 array++;
2042 }
2043
2044 if (type & PERF_SAMPLE_TID) {
2045 u.val64 = *array;
2046 if (swapped) {
2047 /* undo swap of u64, then swap on individual u32s */
2048 u.val64 = bswap_64(u.val64);
2049 u.val32[0] = bswap_32(u.val32[0]);
2050 u.val32[1] = bswap_32(u.val32[1]);
2051 }
2052
2053 data->pid = u.val32[0];
2054 data->tid = u.val32[1];
2055 array++;
2056 }
2057
2058 if (type & PERF_SAMPLE_TIME) {
2059 data->time = *array;
2060 array++;
2061 }
2062
2063 if (type & PERF_SAMPLE_ADDR) {
2064 data->addr = *array;
2065 array++;
2066 }
2067
2068 if (type & PERF_SAMPLE_ID) {
2069 data->id = *array;
2070 array++;
2071 }
2072
2073 if (type & PERF_SAMPLE_STREAM_ID) {
2074 data->stream_id = *array;
2075 array++;
2076 }
2077
2078 if (type & PERF_SAMPLE_CPU) {
2079
2080 u.val64 = *array;
2081 if (swapped) {
2082 /* undo swap of u64, then swap on individual u32s */
2083 u.val64 = bswap_64(u.val64);
2084 u.val32[0] = bswap_32(u.val32[0]);
2085 }
2086
2087 data->cpu = u.val32[0];
2088 array++;
2089 }
2090
2091 if (type & PERF_SAMPLE_PERIOD) {
2092 data->period = *array;
2093 array++;
2094 }
2095
2096 if (type & PERF_SAMPLE_READ) {
2097 u64 read_format = evsel->core.attr.read_format;
2098
2099 OVERFLOW_CHECK_u64(array);
2100 if (read_format & PERF_FORMAT_GROUP)
2101 data->read.group.nr = *array;
2102 else
2103 data->read.one.value = *array;
2104
2105 array++;
2106
2107 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2108 OVERFLOW_CHECK_u64(array);
2109 data->read.time_enabled = *array;
2110 array++;
2111 }
2112
2113 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2114 OVERFLOW_CHECK_u64(array);
2115 data->read.time_running = *array;
2116 array++;
2117 }
2118
2119 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2120 if (read_format & PERF_FORMAT_GROUP) {
2121 const u64 max_group_nr = UINT64_MAX /
2122 sizeof(struct sample_read_value);
2123
2124 if (data->read.group.nr > max_group_nr)
2125 return -EFAULT;
2126 sz = data->read.group.nr *
2127 sizeof(struct sample_read_value);
2128 OVERFLOW_CHECK(array, sz, max_size);
2129 data->read.group.values =
2130 (struct sample_read_value *)array;
2131 array = (void *)array + sz;
2132 } else {
2133 OVERFLOW_CHECK_u64(array);
2134 data->read.one.id = *array;
2135 array++;
2136 }
2137 }
2138
2139 if (evsel__has_callchain(evsel)) {
2140 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2141
2142 OVERFLOW_CHECK_u64(array);
2143 data->callchain = (struct ip_callchain *)array++;
2144 if (data->callchain->nr > max_callchain_nr)
2145 return -EFAULT;
2146 sz = data->callchain->nr * sizeof(u64);
2147 OVERFLOW_CHECK(array, sz, max_size);
2148 array = (void *)array + sz;
2149 }
2150
2151 if (type & PERF_SAMPLE_RAW) {
2152 OVERFLOW_CHECK_u64(array);
2153 u.val64 = *array;
2154
2155 /*
2156 * Undo swap of u64, then swap on individual u32s,
2157 * get the size of the raw area and undo all of the
2158 * swap. The pevent interface handles endianity by
2159 * itself.
2160 */
2161 if (swapped) {
2162 u.val64 = bswap_64(u.val64);
2163 u.val32[0] = bswap_32(u.val32[0]);
2164 u.val32[1] = bswap_32(u.val32[1]);
2165 }
2166 data->raw_size = u.val32[0];
2167
2168 /*
2169 * The raw data is aligned on 64bits including the
2170 * u32 size, so it's safe to use mem_bswap_64.
2171 */
2172 if (swapped)
2173 mem_bswap_64((void *) array, data->raw_size);
2174
2175 array = (void *)array + sizeof(u32);
2176
2177 OVERFLOW_CHECK(array, data->raw_size, max_size);
2178 data->raw_data = (void *)array;
2179 array = (void *)array + data->raw_size;
2180 }
2181
2182 if (type & PERF_SAMPLE_BRANCH_STACK) {
2183 const u64 max_branch_nr = UINT64_MAX /
2184 sizeof(struct branch_entry);
2185
2186 OVERFLOW_CHECK_u64(array);
2187 data->branch_stack = (struct branch_stack *)array++;
2188
2189 if (data->branch_stack->nr > max_branch_nr)
2190 return -EFAULT;
2191
2192 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2193 if (perf_evsel__has_branch_hw_idx(evsel))
2194 sz += sizeof(u64);
2195 else
2196 data->no_hw_idx = true;
2197 OVERFLOW_CHECK(array, sz, max_size);
2198 array = (void *)array + sz;
2199 }
2200
2201 if (type & PERF_SAMPLE_REGS_USER) {
2202 OVERFLOW_CHECK_u64(array);
2203 data->user_regs.abi = *array;
2204 array++;
2205
2206 if (data->user_regs.abi) {
2207 u64 mask = evsel->core.attr.sample_regs_user;
2208
2209 sz = hweight64(mask) * sizeof(u64);
2210 OVERFLOW_CHECK(array, sz, max_size);
2211 data->user_regs.mask = mask;
2212 data->user_regs.regs = (u64 *)array;
2213 array = (void *)array + sz;
2214 }
2215 }
2216
2217 if (type & PERF_SAMPLE_STACK_USER) {
2218 OVERFLOW_CHECK_u64(array);
2219 sz = *array++;
2220
2221 data->user_stack.offset = ((char *)(array - 1)
2222 - (char *) event);
2223
2224 if (!sz) {
2225 data->user_stack.size = 0;
2226 } else {
2227 OVERFLOW_CHECK(array, sz, max_size);
2228 data->user_stack.data = (char *)array;
2229 array = (void *)array + sz;
2230 OVERFLOW_CHECK_u64(array);
2231 data->user_stack.size = *array++;
2232 if (WARN_ONCE(data->user_stack.size > sz,
2233 "user stack dump failure\n"))
2234 return -EFAULT;
2235 }
2236 }
2237
2238 if (type & PERF_SAMPLE_WEIGHT) {
2239 OVERFLOW_CHECK_u64(array);
2240 data->weight = *array;
2241 array++;
2242 }
2243
2244 if (type & PERF_SAMPLE_DATA_SRC) {
2245 OVERFLOW_CHECK_u64(array);
2246 data->data_src = *array;
2247 array++;
2248 }
2249
2250 if (type & PERF_SAMPLE_TRANSACTION) {
2251 OVERFLOW_CHECK_u64(array);
2252 data->transaction = *array;
2253 array++;
2254 }
2255
2256 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2257 if (type & PERF_SAMPLE_REGS_INTR) {
2258 OVERFLOW_CHECK_u64(array);
2259 data->intr_regs.abi = *array;
2260 array++;
2261
2262 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2263 u64 mask = evsel->core.attr.sample_regs_intr;
2264
2265 sz = hweight64(mask) * sizeof(u64);
2266 OVERFLOW_CHECK(array, sz, max_size);
2267 data->intr_regs.mask = mask;
2268 data->intr_regs.regs = (u64 *)array;
2269 array = (void *)array + sz;
2270 }
2271 }
2272
2273 data->phys_addr = 0;
2274 if (type & PERF_SAMPLE_PHYS_ADDR) {
2275 data->phys_addr = *array;
2276 array++;
2277 }
2278
2279 data->cgroup = 0;
2280 if (type & PERF_SAMPLE_CGROUP) {
2281 data->cgroup = *array;
2282 array++;
2283 }
2284
2285 if (type & PERF_SAMPLE_AUX) {
2286 OVERFLOW_CHECK_u64(array);
2287 sz = *array++;
2288
2289 OVERFLOW_CHECK(array, sz, max_size);
2290 /* Undo swap of data */
2291 if (swapped)
2292 mem_bswap_64((char *)array, sz);
2293 data->aux_sample.size = sz;
2294 data->aux_sample.data = (char *)array;
2295 array = (void *)array + sz;
2296 }
2297
2298 return 0;
2299 }
2300
2301 int perf_evsel__parse_sample_timestamp(struct evsel *evsel,
2302 union perf_event *event,
2303 u64 *timestamp)
2304 {
2305 u64 type = evsel->core.attr.sample_type;
2306 const __u64 *array;
2307
2308 if (!(type & PERF_SAMPLE_TIME))
2309 return -1;
2310
2311 if (event->header.type != PERF_RECORD_SAMPLE) {
2312 struct perf_sample data = {
2313 .time = -1ULL,
2314 };
2315
2316 if (!evsel->core.attr.sample_id_all)
2317 return -1;
2318 if (perf_evsel__parse_id_sample(evsel, event, &data))
2319 return -1;
2320
2321 *timestamp = data.time;
2322 return 0;
2323 }
2324
2325 array = event->sample.array;
2326
2327 if (perf_event__check_size(event, evsel->sample_size))
2328 return -EFAULT;
2329
2330 if (type & PERF_SAMPLE_IDENTIFIER)
2331 array++;
2332
2333 if (type & PERF_SAMPLE_IP)
2334 array++;
2335
2336 if (type & PERF_SAMPLE_TID)
2337 array++;
2338
2339 if (type & PERF_SAMPLE_TIME)
2340 *timestamp = *array;
2341
2342 return 0;
2343 }
2344
2345 struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name)
2346 {
2347 return tep_find_field(evsel->tp_format, name);
2348 }
2349
2350 void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample,
2351 const char *name)
2352 {
2353 struct tep_format_field *field = perf_evsel__field(evsel, name);
2354 int offset;
2355
2356 if (!field)
2357 return NULL;
2358
2359 offset = field->offset;
2360
2361 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2362 offset = *(int *)(sample->raw_data + field->offset);
2363 offset &= 0xffff;
2364 }
2365
2366 return sample->raw_data + offset;
2367 }
2368
2369 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2370 bool needs_swap)
2371 {
2372 u64 value;
2373 void *ptr = sample->raw_data + field->offset;
2374
2375 switch (field->size) {
2376 case 1:
2377 return *(u8 *)ptr;
2378 case 2:
2379 value = *(u16 *)ptr;
2380 break;
2381 case 4:
2382 value = *(u32 *)ptr;
2383 break;
2384 case 8:
2385 memcpy(&value, ptr, sizeof(u64));
2386 break;
2387 default:
2388 return 0;
2389 }
2390
2391 if (!needs_swap)
2392 return value;
2393
2394 switch (field->size) {
2395 case 2:
2396 return bswap_16(value);
2397 case 4:
2398 return bswap_32(value);
2399 case 8:
2400 return bswap_64(value);
2401 default:
2402 return 0;
2403 }
2404
2405 return 0;
2406 }
2407
2408 u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample,
2409 const char *name)
2410 {
2411 struct tep_format_field *field = perf_evsel__field(evsel, name);
2412
2413 if (!field)
2414 return 0;
2415
2416 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2417 }
2418
2419 bool perf_evsel__fallback(struct evsel *evsel, int err,
2420 char *msg, size_t msgsize)
2421 {
2422 int paranoid;
2423
2424 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2425 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2426 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2427 /*
2428 * If it's cycles then fall back to hrtimer based
2429 * cpu-clock-tick sw counter, which is always available even if
2430 * no PMU support.
2431 *
2432 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2433 * b0a873e).
2434 */
2435 scnprintf(msg, msgsize, "%s",
2436 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2437
2438 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2439 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2440
2441 zfree(&evsel->name);
2442 return true;
2443 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2444 (paranoid = perf_event_paranoid()) > 1) {
2445 const char *name = perf_evsel__name(evsel);
2446 char *new_name;
2447 const char *sep = ":";
2448
2449 /* Is there already the separator in the name. */
2450 if (strchr(name, '/') ||
2451 strchr(name, ':'))
2452 sep = "";
2453
2454 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2455 return false;
2456
2457 if (evsel->name)
2458 free(evsel->name);
2459 evsel->name = new_name;
2460 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2461 "to fall back to excluding kernel and hypervisor "
2462 " samples", paranoid);
2463 evsel->core.attr.exclude_kernel = 1;
2464 evsel->core.attr.exclude_hv = 1;
2465
2466 return true;
2467 }
2468
2469 return false;
2470 }
2471
2472 static bool find_process(const char *name)
2473 {
2474 size_t len = strlen(name);
2475 DIR *dir;
2476 struct dirent *d;
2477 int ret = -1;
2478
2479 dir = opendir(procfs__mountpoint());
2480 if (!dir)
2481 return false;
2482
2483 /* Walk through the directory. */
2484 while (ret && (d = readdir(dir)) != NULL) {
2485 char path[PATH_MAX];
2486 char *data;
2487 size_t size;
2488
2489 if ((d->d_type != DT_DIR) ||
2490 !strcmp(".", d->d_name) ||
2491 !strcmp("..", d->d_name))
2492 continue;
2493
2494 scnprintf(path, sizeof(path), "%s/%s/comm",
2495 procfs__mountpoint(), d->d_name);
2496
2497 if (filename__read_str(path, &data, &size))
2498 continue;
2499
2500 ret = strncmp(name, data, len);
2501 free(data);
2502 }
2503
2504 closedir(dir);
2505 return ret ? false : true;
2506 }
2507
2508 int perf_evsel__open_strerror(struct evsel *evsel, struct target *target,
2509 int err, char *msg, size_t size)
2510 {
2511 char sbuf[STRERR_BUFSIZE];
2512 int printed = 0;
2513
2514 switch (err) {
2515 case EPERM:
2516 case EACCES:
2517 if (err == EPERM)
2518 printed = scnprintf(msg, size,
2519 "No permission to enable %s event.\n\n",
2520 perf_evsel__name(evsel));
2521
2522 return scnprintf(msg + printed, size - printed,
2523 "You may not have permission to collect %sstats.\n\n"
2524 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2525 "which controls use of the performance events system by\n"
2526 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2527 "The current value is %d:\n\n"
2528 " -1: Allow use of (almost) all events by all users\n"
2529 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2530 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2531 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2532 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2533 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2534 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2535 " kernel.perf_event_paranoid = -1\n" ,
2536 target->system_wide ? "system-wide " : "",
2537 perf_event_paranoid());
2538 case ENOENT:
2539 return scnprintf(msg, size, "The %s event is not supported.",
2540 perf_evsel__name(evsel));
2541 case EMFILE:
2542 return scnprintf(msg, size, "%s",
2543 "Too many events are opened.\n"
2544 "Probably the maximum number of open file descriptors has been reached.\n"
2545 "Hint: Try again after reducing the number of events.\n"
2546 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2547 case ENOMEM:
2548 if (evsel__has_callchain(evsel) &&
2549 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2550 return scnprintf(msg, size,
2551 "Not enough memory to setup event with callchain.\n"
2552 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2553 "Hint: Current value: %d", sysctl__max_stack());
2554 break;
2555 case ENODEV:
2556 if (target->cpu_list)
2557 return scnprintf(msg, size, "%s",
2558 "No such device - did you specify an out-of-range profile CPU?");
2559 break;
2560 case EOPNOTSUPP:
2561 if (evsel->core.attr.sample_period != 0)
2562 return scnprintf(msg, size,
2563 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2564 perf_evsel__name(evsel));
2565 if (evsel->core.attr.precise_ip)
2566 return scnprintf(msg, size, "%s",
2567 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2568 #if defined(__i386__) || defined(__x86_64__)
2569 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2570 return scnprintf(msg, size, "%s",
2571 "No hardware sampling interrupt available.\n");
2572 #endif
2573 break;
2574 case EBUSY:
2575 if (find_process("oprofiled"))
2576 return scnprintf(msg, size,
2577 "The PMU counters are busy/taken by another profiler.\n"
2578 "We found oprofile daemon running, please stop it and try again.");
2579 break;
2580 case EINVAL:
2581 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2582 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2583 if (perf_missing_features.clockid)
2584 return scnprintf(msg, size, "clockid feature not supported.");
2585 if (perf_missing_features.clockid_wrong)
2586 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2587 if (perf_missing_features.aux_output)
2588 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2589 break;
2590 default:
2591 break;
2592 }
2593
2594 return scnprintf(msg, size,
2595 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2596 "/bin/dmesg | grep -i perf may provide additional information.\n",
2597 err, str_error_r(err, sbuf, sizeof(sbuf)),
2598 perf_evsel__name(evsel));
2599 }
2600
2601 struct perf_env *perf_evsel__env(struct evsel *evsel)
2602 {
2603 if (evsel && evsel->evlist)
2604 return evsel->evlist->env;
2605 return &perf_env;
2606 }
2607
2608 static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2609 {
2610 int cpu, thread;
2611
2612 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2613 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2614 thread++) {
2615 int fd = FD(evsel, cpu, thread);
2616
2617 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2618 cpu, thread, fd) < 0)
2619 return -1;
2620 }
2621 }
2622
2623 return 0;
2624 }
2625
2626 int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2627 {
2628 struct perf_cpu_map *cpus = evsel->core.cpus;
2629 struct perf_thread_map *threads = evsel->core.threads;
2630
2631 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2632 return -ENOMEM;
2633
2634 return store_evsel_ids(evsel, evlist);
2635 }
Linux with added FPC-III support