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perf annotate: Split allocation of annotated_source struct
[linux/fpc-iii.git] / tools / perf / util / evsel.c
blob150db5ed7400e3ea374477e233b5255dff49215d
1 /*
2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
3 *
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
5 * copyright notes.
6 *
7 * Released under the GPL v2. (and only v2, not any later version)
8 */
9
10 #include <byteswap.h>
11 #include <errno.h>
12 #include <inttypes.h>
13 #include <linux/bitops.h>
14 #include <api/fs/fs.h>
15 #include <api/fs/tracing_path.h>
16 #include <traceevent/event-parse.h>
17 #include <linux/hw_breakpoint.h>
18 #include <linux/perf_event.h>
19 #include <linux/compiler.h>
20 #include <linux/err.h>
21 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/types.h>
24 #include <dirent.h>
25 #include "asm/bug.h"
26 #include "callchain.h"
27 #include "cgroup.h"
28 #include "event.h"
29 #include "evsel.h"
30 #include "evlist.h"
31 #include "util.h"
32 #include "cpumap.h"
33 #include "thread_map.h"
34 #include "target.h"
35 #include "perf_regs.h"
36 #include "debug.h"
37 #include "trace-event.h"
38 #include "stat.h"
39 #include "memswap.h"
40 #include "util/parse-branch-options.h"
41
42 #include "sane_ctype.h"
43
44 struct perf_missing_features perf_missing_features;
45
46 static clockid_t clockid;
47
48 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
49 {
50 return 0;
51 }
52
53 void __weak test_attr__ready(void) { }
54
55 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
56 {
57 }
58
59 static struct {
60 size_t size;
61 int (*init)(struct perf_evsel *evsel);
62 void (*fini)(struct perf_evsel *evsel);
63 } perf_evsel__object = {
64 .size = sizeof(struct perf_evsel),
65 .init = perf_evsel__no_extra_init,
66 .fini = perf_evsel__no_extra_fini,
67 };
68
69 int perf_evsel__object_config(size_t object_size,
70 int (*init)(struct perf_evsel *evsel),
71 void (*fini)(struct perf_evsel *evsel))
72 {
73
74 if (object_size == 0)
75 goto set_methods;
76
77 if (perf_evsel__object.size > object_size)
78 return -EINVAL;
79
80 perf_evsel__object.size = object_size;
81
82 set_methods:
83 if (init != NULL)
84 perf_evsel__object.init = init;
85
86 if (fini != NULL)
87 perf_evsel__object.fini = fini;
88
89 return 0;
90 }
91
92 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
93
94 int __perf_evsel__sample_size(u64 sample_type)
95 {
96 u64 mask = sample_type & PERF_SAMPLE_MASK;
97 int size = 0;
98 int i;
99
100 for (i = 0; i < 64; i++) {
101 if (mask & (1ULL << i))
102 size++;
103 }
104
105 size *= sizeof(u64);
106
107 return size;
108 }
109
110 /**
111 * __perf_evsel__calc_id_pos - calculate id_pos.
112 * @sample_type: sample type
113 *
114 * This function returns the position of the event id (PERF_SAMPLE_ID or
115 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
116 * sample_event.
117 */
118 static int __perf_evsel__calc_id_pos(u64 sample_type)
119 {
120 int idx = 0;
121
122 if (sample_type & PERF_SAMPLE_IDENTIFIER)
123 return 0;
124
125 if (!(sample_type & PERF_SAMPLE_ID))
126 return -1;
127
128 if (sample_type & PERF_SAMPLE_IP)
129 idx += 1;
130
131 if (sample_type & PERF_SAMPLE_TID)
132 idx += 1;
133
134 if (sample_type & PERF_SAMPLE_TIME)
135 idx += 1;
136
137 if (sample_type & PERF_SAMPLE_ADDR)
138 idx += 1;
139
140 return idx;
141 }
142
143 /**
144 * __perf_evsel__calc_is_pos - calculate is_pos.
145 * @sample_type: sample type
146 *
147 * This function returns the position (counting backwards) of the event id
148 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
149 * sample_id_all is used there is an id sample appended to non-sample events.
150 */
151 static int __perf_evsel__calc_is_pos(u64 sample_type)
152 {
153 int idx = 1;
154
155 if (sample_type & PERF_SAMPLE_IDENTIFIER)
156 return 1;
157
158 if (!(sample_type & PERF_SAMPLE_ID))
159 return -1;
160
161 if (sample_type & PERF_SAMPLE_CPU)
162 idx += 1;
163
164 if (sample_type & PERF_SAMPLE_STREAM_ID)
165 idx += 1;
166
167 return idx;
168 }
169
170 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
171 {
172 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
173 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
174 }
175
176 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
177 enum perf_event_sample_format bit)
178 {
179 if (!(evsel->attr.sample_type & bit)) {
180 evsel->attr.sample_type |= bit;
181 evsel->sample_size += sizeof(u64);
182 perf_evsel__calc_id_pos(evsel);
183 }
184 }
185
186 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
187 enum perf_event_sample_format bit)
188 {
189 if (evsel->attr.sample_type & bit) {
190 evsel->attr.sample_type &= ~bit;
191 evsel->sample_size -= sizeof(u64);
192 perf_evsel__calc_id_pos(evsel);
193 }
194 }
195
196 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
197 bool can_sample_identifier)
198 {
199 if (can_sample_identifier) {
200 perf_evsel__reset_sample_bit(evsel, ID);
201 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
202 } else {
203 perf_evsel__set_sample_bit(evsel, ID);
204 }
205 evsel->attr.read_format |= PERF_FORMAT_ID;
206 }
207
208 /**
209 * perf_evsel__is_function_event - Return whether given evsel is a function
210 * trace event
211 *
212 * @evsel - evsel selector to be tested
213 *
214 * Return %true if event is function trace event
215 */
216 bool perf_evsel__is_function_event(struct perf_evsel *evsel)
217 {
218 #define FUNCTION_EVENT "ftrace:function"
219
220 return evsel->name &&
221 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
222
223 #undef FUNCTION_EVENT
224 }
225
226 void perf_evsel__init(struct perf_evsel *evsel,
227 struct perf_event_attr *attr, int idx)
228 {
229 evsel->idx = idx;
230 evsel->tracking = !idx;
231 evsel->attr = *attr;
232 evsel->leader = evsel;
233 evsel->unit = "";
234 evsel->scale = 1.0;
235 evsel->evlist = NULL;
236 evsel->bpf_fd = -1;
237 INIT_LIST_HEAD(&evsel->node);
238 INIT_LIST_HEAD(&evsel->config_terms);
239 perf_evsel__object.init(evsel);
240 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
241 perf_evsel__calc_id_pos(evsel);
242 evsel->cmdline_group_boundary = false;
243 evsel->metric_expr = NULL;
244 evsel->metric_name = NULL;
245 evsel->metric_events = NULL;
246 evsel->collect_stat = false;
247 evsel->pmu_name = NULL;
248 }
249
250 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
251 {
252 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
253
254 if (evsel != NULL)
255 perf_evsel__init(evsel, attr, idx);
256
257 if (perf_evsel__is_bpf_output(evsel)) {
258 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
259 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
260 evsel->attr.sample_period = 1;
261 }
262
263 return evsel;
264 }
265
266 static bool perf_event_can_profile_kernel(void)
267 {
268 return geteuid() == 0 || perf_event_paranoid() == -1;
269 }
270
271 struct perf_evsel *perf_evsel__new_cycles(bool precise)
272 {
273 struct perf_event_attr attr = {
274 .type = PERF_TYPE_HARDWARE,
275 .config = PERF_COUNT_HW_CPU_CYCLES,
276 .exclude_kernel = !perf_event_can_profile_kernel(),
277 };
278 struct perf_evsel *evsel;
279
280 event_attr_init(&attr);
281
282 if (!precise)
283 goto new_event;
284 /*
285 * Unnamed union member, not supported as struct member named
286 * initializer in older compilers such as gcc 4.4.7
287 *
288 * Just for probing the precise_ip:
289 */
290 attr.sample_period = 1;
291
292 perf_event_attr__set_max_precise_ip(&attr);
293 /*
294 * Now let the usual logic to set up the perf_event_attr defaults
295 * to kick in when we return and before perf_evsel__open() is called.
296 */
297 attr.sample_period = 0;
298 new_event:
299 evsel = perf_evsel__new(&attr);
300 if (evsel == NULL)
301 goto out;
302
303 /* use asprintf() because free(evsel) assumes name is allocated */
304 if (asprintf(&evsel->name, "cycles%s%s%.*s",
305 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
306 attr.exclude_kernel ? "u" : "",
307 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
308 goto error_free;
309 out:
310 return evsel;
311 error_free:
312 perf_evsel__delete(evsel);
313 evsel = NULL;
314 goto out;
315 }
316
317 /*
318 * Returns pointer with encoded error via <linux/err.h> interface.
319 */
320 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
321 {
322 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
323 int err = -ENOMEM;
324
325 if (evsel == NULL) {
326 goto out_err;
327 } else {
328 struct perf_event_attr attr = {
329 .type = PERF_TYPE_TRACEPOINT,
330 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
331 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
332 };
333
334 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
335 goto out_free;
336
337 evsel->tp_format = trace_event__tp_format(sys, name);
338 if (IS_ERR(evsel->tp_format)) {
339 err = PTR_ERR(evsel->tp_format);
340 goto out_free;
341 }
342
343 event_attr_init(&attr);
344 attr.config = evsel->tp_format->id;
345 attr.sample_period = 1;
346 perf_evsel__init(evsel, &attr, idx);
347 }
348
349 return evsel;
350
351 out_free:
352 zfree(&evsel->name);
353 free(evsel);
354 out_err:
355 return ERR_PTR(err);
356 }
357
358 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
359 "cycles",
360 "instructions",
361 "cache-references",
362 "cache-misses",
363 "branches",
364 "branch-misses",
365 "bus-cycles",
366 "stalled-cycles-frontend",
367 "stalled-cycles-backend",
368 "ref-cycles",
369 };
370
371 static const char *__perf_evsel__hw_name(u64 config)
372 {
373 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
374 return perf_evsel__hw_names[config];
375
376 return "unknown-hardware";
377 }
378
379 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
380 {
381 int colon = 0, r = 0;
382 struct perf_event_attr *attr = &evsel->attr;
383 bool exclude_guest_default = false;
384
385 #define MOD_PRINT(context, mod) do { \
386 if (!attr->exclude_##context) { \
387 if (!colon) colon = ++r; \
388 r += scnprintf(bf + r, size - r, "%c", mod); \
389 } } while(0)
390
391 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
392 MOD_PRINT(kernel, 'k');
393 MOD_PRINT(user, 'u');
394 MOD_PRINT(hv, 'h');
395 exclude_guest_default = true;
396 }
397
398 if (attr->precise_ip) {
399 if (!colon)
400 colon = ++r;
401 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
402 exclude_guest_default = true;
403 }
404
405 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
406 MOD_PRINT(host, 'H');
407 MOD_PRINT(guest, 'G');
408 }
409 #undef MOD_PRINT
410 if (colon)
411 bf[colon - 1] = ':';
412 return r;
413 }
414
415 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
416 {
417 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
418 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
419 }
420
421 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
422 "cpu-clock",
423 "task-clock",
424 "page-faults",
425 "context-switches",
426 "cpu-migrations",
427 "minor-faults",
428 "major-faults",
429 "alignment-faults",
430 "emulation-faults",
431 "dummy",
432 };
433
434 static const char *__perf_evsel__sw_name(u64 config)
435 {
436 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
437 return perf_evsel__sw_names[config];
438 return "unknown-software";
439 }
440
441 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
442 {
443 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
444 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
445 }
446
447 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
448 {
449 int r;
450
451 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
452
453 if (type & HW_BREAKPOINT_R)
454 r += scnprintf(bf + r, size - r, "r");
455
456 if (type & HW_BREAKPOINT_W)
457 r += scnprintf(bf + r, size - r, "w");
458
459 if (type & HW_BREAKPOINT_X)
460 r += scnprintf(bf + r, size - r, "x");
461
462 return r;
463 }
464
465 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
466 {
467 struct perf_event_attr *attr = &evsel->attr;
468 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
469 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
470 }
471
472 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
473 [PERF_EVSEL__MAX_ALIASES] = {
474 { "L1-dcache", "l1-d", "l1d", "L1-data", },
475 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
476 { "LLC", "L2", },
477 { "dTLB", "d-tlb", "Data-TLB", },
478 { "iTLB", "i-tlb", "Instruction-TLB", },
479 { "branch", "branches", "bpu", "btb", "bpc", },
480 { "node", },
481 };
482
483 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
484 [PERF_EVSEL__MAX_ALIASES] = {
485 { "load", "loads", "read", },
486 { "store", "stores", "write", },
487 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
488 };
489
490 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
491 [PERF_EVSEL__MAX_ALIASES] = {
492 { "refs", "Reference", "ops", "access", },
493 { "misses", "miss", },
494 };
495
496 #define C(x) PERF_COUNT_HW_CACHE_##x
497 #define CACHE_READ (1 << C(OP_READ))
498 #define CACHE_WRITE (1 << C(OP_WRITE))
499 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
500 #define COP(x) (1 << x)
501
502 /*
503 * cache operartion stat
504 * L1I : Read and prefetch only
505 * ITLB and BPU : Read-only
506 */
507 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
508 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
509 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
510 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
511 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
512 [C(ITLB)] = (CACHE_READ),
513 [C(BPU)] = (CACHE_READ),
514 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
515 };
516
517 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
518 {
519 if (perf_evsel__hw_cache_stat[type] & COP(op))
520 return true; /* valid */
521 else
522 return false; /* invalid */
523 }
524
525 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
526 char *bf, size_t size)
527 {
528 if (result) {
529 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
530 perf_evsel__hw_cache_op[op][0],
531 perf_evsel__hw_cache_result[result][0]);
532 }
533
534 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
535 perf_evsel__hw_cache_op[op][1]);
536 }
537
538 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
539 {
540 u8 op, result, type = (config >> 0) & 0xff;
541 const char *err = "unknown-ext-hardware-cache-type";
542
543 if (type >= PERF_COUNT_HW_CACHE_MAX)
544 goto out_err;
545
546 op = (config >> 8) & 0xff;
547 err = "unknown-ext-hardware-cache-op";
548 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
549 goto out_err;
550
551 result = (config >> 16) & 0xff;
552 err = "unknown-ext-hardware-cache-result";
553 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
554 goto out_err;
555
556 err = "invalid-cache";
557 if (!perf_evsel__is_cache_op_valid(type, op))
558 goto out_err;
559
560 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
561 out_err:
562 return scnprintf(bf, size, "%s", err);
563 }
564
565 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
566 {
567 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
568 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
569 }
570
571 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
572 {
573 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
574 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
575 }
576
577 const char *perf_evsel__name(struct perf_evsel *evsel)
578 {
579 char bf[128];
580
581 if (evsel->name)
582 return evsel->name;
583
584 switch (evsel->attr.type) {
585 case PERF_TYPE_RAW:
586 perf_evsel__raw_name(evsel, bf, sizeof(bf));
587 break;
588
589 case PERF_TYPE_HARDWARE:
590 perf_evsel__hw_name(evsel, bf, sizeof(bf));
591 break;
592
593 case PERF_TYPE_HW_CACHE:
594 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
595 break;
596
597 case PERF_TYPE_SOFTWARE:
598 perf_evsel__sw_name(evsel, bf, sizeof(bf));
599 break;
600
601 case PERF_TYPE_TRACEPOINT:
602 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
603 break;
604
605 case PERF_TYPE_BREAKPOINT:
606 perf_evsel__bp_name(evsel, bf, sizeof(bf));
607 break;
608
609 default:
610 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
611 evsel->attr.type);
612 break;
613 }
614
615 evsel->name = strdup(bf);
616
617 return evsel->name ?: "unknown";
618 }
619
620 const char *perf_evsel__group_name(struct perf_evsel *evsel)
621 {
622 return evsel->group_name ?: "anon group";
623 }
624
625 /*
626 * Returns the group details for the specified leader,
627 * with following rules.
628 *
629 * For record -e '{cycles,instructions}'
630 * 'anon group { cycles:u, instructions:u }'
631 *
632 * For record -e 'cycles,instructions' and report --group
633 * 'cycles:u, instructions:u'
634 */
635 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
636 {
637 int ret = 0;
638 struct perf_evsel *pos;
639 const char *group_name = perf_evsel__group_name(evsel);
640
641 if (!evsel->forced_leader)
642 ret = scnprintf(buf, size, "%s { ", group_name);
643
644 ret += scnprintf(buf + ret, size - ret, "%s",
645 perf_evsel__name(evsel));
646
647 for_each_group_member(pos, evsel)
648 ret += scnprintf(buf + ret, size - ret, ", %s",
649 perf_evsel__name(pos));
650
651 if (!evsel->forced_leader)
652 ret += scnprintf(buf + ret, size - ret, " }");
653
654 return ret;
655 }
656
657 static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
658 struct record_opts *opts,
659 struct callchain_param *param)
660 {
661 bool function = perf_evsel__is_function_event(evsel);
662 struct perf_event_attr *attr = &evsel->attr;
663
664 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
665
666 attr->sample_max_stack = param->max_stack;
667
668 if (param->record_mode == CALLCHAIN_LBR) {
669 if (!opts->branch_stack) {
670 if (attr->exclude_user) {
671 pr_warning("LBR callstack option is only available "
672 "to get user callchain information. "
673 "Falling back to framepointers.\n");
674 } else {
675 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
676 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
677 PERF_SAMPLE_BRANCH_CALL_STACK |
678 PERF_SAMPLE_BRANCH_NO_CYCLES |
679 PERF_SAMPLE_BRANCH_NO_FLAGS;
680 }
681 } else
682 pr_warning("Cannot use LBR callstack with branch stack. "
683 "Falling back to framepointers.\n");
684 }
685
686 if (param->record_mode == CALLCHAIN_DWARF) {
687 if (!function) {
688 perf_evsel__set_sample_bit(evsel, REGS_USER);
689 perf_evsel__set_sample_bit(evsel, STACK_USER);
690 attr->sample_regs_user |= PERF_REGS_MASK;
691 attr->sample_stack_user = param->dump_size;
692 attr->exclude_callchain_user = 1;
693 } else {
694 pr_info("Cannot use DWARF unwind for function trace event,"
695 " falling back to framepointers.\n");
696 }
697 }
698
699 if (function) {
700 pr_info("Disabling user space callchains for function trace event.\n");
701 attr->exclude_callchain_user = 1;
702 }
703 }
704
705 void perf_evsel__config_callchain(struct perf_evsel *evsel,
706 struct record_opts *opts,
707 struct callchain_param *param)
708 {
709 if (param->enabled)
710 return __perf_evsel__config_callchain(evsel, opts, param);
711 }
712
713 static void
714 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
715 struct callchain_param *param)
716 {
717 struct perf_event_attr *attr = &evsel->attr;
718
719 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
720 if (param->record_mode == CALLCHAIN_LBR) {
721 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
722 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
723 PERF_SAMPLE_BRANCH_CALL_STACK);
724 }
725 if (param->record_mode == CALLCHAIN_DWARF) {
726 perf_evsel__reset_sample_bit(evsel, REGS_USER);
727 perf_evsel__reset_sample_bit(evsel, STACK_USER);
728 }
729 }
730
731 static void apply_config_terms(struct perf_evsel *evsel,
732 struct record_opts *opts, bool track)
733 {
734 struct perf_evsel_config_term *term;
735 struct list_head *config_terms = &evsel->config_terms;
736 struct perf_event_attr *attr = &evsel->attr;
737 /* callgraph default */
738 struct callchain_param param = {
739 .record_mode = callchain_param.record_mode,
740 };
741 u32 dump_size = 0;
742 int max_stack = 0;
743 const char *callgraph_buf = NULL;
744
745 list_for_each_entry(term, config_terms, list) {
746 switch (term->type) {
747 case PERF_EVSEL__CONFIG_TERM_PERIOD:
748 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
749 attr->sample_period = term->val.period;
750 attr->freq = 0;
751 perf_evsel__reset_sample_bit(evsel, PERIOD);
752 }
753 break;
754 case PERF_EVSEL__CONFIG_TERM_FREQ:
755 if (!(term->weak && opts->user_freq != UINT_MAX)) {
756 attr->sample_freq = term->val.freq;
757 attr->freq = 1;
758 perf_evsel__set_sample_bit(evsel, PERIOD);
759 }
760 break;
761 case PERF_EVSEL__CONFIG_TERM_TIME:
762 if (term->val.time)
763 perf_evsel__set_sample_bit(evsel, TIME);
764 else
765 perf_evsel__reset_sample_bit(evsel, TIME);
766 break;
767 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
768 callgraph_buf = term->val.callgraph;
769 break;
770 case PERF_EVSEL__CONFIG_TERM_BRANCH:
771 if (term->val.branch && strcmp(term->val.branch, "no")) {
772 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
773 parse_branch_str(term->val.branch,
774 &attr->branch_sample_type);
775 } else
776 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
777 break;
778 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
779 dump_size = term->val.stack_user;
780 break;
781 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
782 max_stack = term->val.max_stack;
783 break;
784 case PERF_EVSEL__CONFIG_TERM_INHERIT:
785 /*
786 * attr->inherit should has already been set by
787 * perf_evsel__config. If user explicitly set
788 * inherit using config terms, override global
789 * opt->no_inherit setting.
790 */
791 attr->inherit = term->val.inherit ? 1 : 0;
792 break;
793 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
794 attr->write_backward = term->val.overwrite ? 1 : 0;
795 break;
796 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
797 break;
798 default:
799 break;
800 }
801 }
802
803 /* User explicitly set per-event callgraph, clear the old setting and reset. */
804 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
805 bool sample_address = false;
806
807 if (max_stack) {
808 param.max_stack = max_stack;
809 if (callgraph_buf == NULL)
810 callgraph_buf = "fp";
811 }
812
813 /* parse callgraph parameters */
814 if (callgraph_buf != NULL) {
815 if (!strcmp(callgraph_buf, "no")) {
816 param.enabled = false;
817 param.record_mode = CALLCHAIN_NONE;
818 } else {
819 param.enabled = true;
820 if (parse_callchain_record(callgraph_buf, &param)) {
821 pr_err("per-event callgraph setting for %s failed. "
822 "Apply callgraph global setting for it\n",
823 evsel->name);
824 return;
825 }
826 if (param.record_mode == CALLCHAIN_DWARF)
827 sample_address = true;
828 }
829 }
830 if (dump_size > 0) {
831 dump_size = round_up(dump_size, sizeof(u64));
832 param.dump_size = dump_size;
833 }
834
835 /* If global callgraph set, clear it */
836 if (callchain_param.enabled)
837 perf_evsel__reset_callgraph(evsel, &callchain_param);
838
839 /* set perf-event callgraph */
840 if (param.enabled) {
841 if (sample_address) {
842 perf_evsel__set_sample_bit(evsel, ADDR);
843 perf_evsel__set_sample_bit(evsel, DATA_SRC);
844 evsel->attr.mmap_data = track;
845 }
846 perf_evsel__config_callchain(evsel, opts, &param);
847 }
848 }
849 }
850
851 /*
852 * The enable_on_exec/disabled value strategy:
853 *
854 * 1) For any type of traced program:
855 * - all independent events and group leaders are disabled
856 * - all group members are enabled
857 *
858 * Group members are ruled by group leaders. They need to
859 * be enabled, because the group scheduling relies on that.
860 *
861 * 2) For traced programs executed by perf:
862 * - all independent events and group leaders have
863 * enable_on_exec set
864 * - we don't specifically enable or disable any event during
865 * the record command
866 *
867 * Independent events and group leaders are initially disabled
868 * and get enabled by exec. Group members are ruled by group
869 * leaders as stated in 1).
870 *
871 * 3) For traced programs attached by perf (pid/tid):
872 * - we specifically enable or disable all events during
873 * the record command
874 *
875 * When attaching events to already running traced we
876 * enable/disable events specifically, as there's no
877 * initial traced exec call.
878 */
879 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
880 struct callchain_param *callchain)
881 {
882 struct perf_evsel *leader = evsel->leader;
883 struct perf_event_attr *attr = &evsel->attr;
884 int track = evsel->tracking;
885 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
886
887 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
888 attr->inherit = !opts->no_inherit;
889 attr->write_backward = opts->overwrite ? 1 : 0;
890
891 perf_evsel__set_sample_bit(evsel, IP);
892 perf_evsel__set_sample_bit(evsel, TID);
893
894 if (evsel->sample_read) {
895 perf_evsel__set_sample_bit(evsel, READ);
896
897 /*
898 * We need ID even in case of single event, because
899 * PERF_SAMPLE_READ process ID specific data.
900 */
901 perf_evsel__set_sample_id(evsel, false);
902
903 /*
904 * Apply group format only if we belong to group
905 * with more than one members.
906 */
907 if (leader->nr_members > 1) {
908 attr->read_format |= PERF_FORMAT_GROUP;
909 attr->inherit = 0;
910 }
911 }
912
913 /*
914 * We default some events to have a default interval. But keep
915 * it a weak assumption overridable by the user.
916 */
917 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
918 opts->user_interval != ULLONG_MAX)) {
919 if (opts->freq) {
920 perf_evsel__set_sample_bit(evsel, PERIOD);
921 attr->freq = 1;
922 attr->sample_freq = opts->freq;
923 } else {
924 attr->sample_period = opts->default_interval;
925 }
926 }
927
928 /*
929 * Disable sampling for all group members other
930 * than leader in case leader 'leads' the sampling.
931 */
932 if ((leader != evsel) && leader->sample_read) {
933 attr->freq = 0;
934 attr->sample_freq = 0;
935 attr->sample_period = 0;
936 attr->write_backward = 0;
937 attr->sample_id_all = 0;
938 }
939
940 if (opts->no_samples)
941 attr->sample_freq = 0;
942
943 if (opts->inherit_stat) {
944 evsel->attr.read_format |=
945 PERF_FORMAT_TOTAL_TIME_ENABLED |
946 PERF_FORMAT_TOTAL_TIME_RUNNING |
947 PERF_FORMAT_ID;
948 attr->inherit_stat = 1;
949 }
950
951 if (opts->sample_address) {
952 perf_evsel__set_sample_bit(evsel, ADDR);
953 attr->mmap_data = track;
954 }
955
956 /*
957 * We don't allow user space callchains for function trace
958 * event, due to issues with page faults while tracing page
959 * fault handler and its overall trickiness nature.
960 */
961 if (perf_evsel__is_function_event(evsel))
962 evsel->attr.exclude_callchain_user = 1;
963
964 if (callchain && callchain->enabled && !evsel->no_aux_samples)
965 perf_evsel__config_callchain(evsel, opts, callchain);
966
967 if (opts->sample_intr_regs) {
968 attr->sample_regs_intr = opts->sample_intr_regs;
969 perf_evsel__set_sample_bit(evsel, REGS_INTR);
970 }
971
972 if (opts->sample_user_regs) {
973 attr->sample_regs_user |= opts->sample_user_regs;
974 perf_evsel__set_sample_bit(evsel, REGS_USER);
975 }
976
977 if (target__has_cpu(&opts->target) || opts->sample_cpu)
978 perf_evsel__set_sample_bit(evsel, CPU);
979
980 /*
981 * When the user explicitly disabled time don't force it here.
982 */
983 if (opts->sample_time &&
984 (!perf_missing_features.sample_id_all &&
985 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
986 opts->sample_time_set)))
987 perf_evsel__set_sample_bit(evsel, TIME);
988
989 if (opts->raw_samples && !evsel->no_aux_samples) {
990 perf_evsel__set_sample_bit(evsel, TIME);
991 perf_evsel__set_sample_bit(evsel, RAW);
992 perf_evsel__set_sample_bit(evsel, CPU);
993 }
994
995 if (opts->sample_address)
996 perf_evsel__set_sample_bit(evsel, DATA_SRC);
997
998 if (opts->sample_phys_addr)
999 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1000
1001 if (opts->no_buffering) {
1002 attr->watermark = 0;
1003 attr->wakeup_events = 1;
1004 }
1005 if (opts->branch_stack && !evsel->no_aux_samples) {
1006 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1007 attr->branch_sample_type = opts->branch_stack;
1008 }
1009
1010 if (opts->sample_weight)
1011 perf_evsel__set_sample_bit(evsel, WEIGHT);
1012
1013 attr->task = track;
1014 attr->mmap = track;
1015 attr->mmap2 = track && !perf_missing_features.mmap2;
1016 attr->comm = track;
1017
1018 if (opts->record_namespaces)
1019 attr->namespaces = track;
1020
1021 if (opts->record_switch_events)
1022 attr->context_switch = track;
1023
1024 if (opts->sample_transaction)
1025 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1026
1027 if (opts->running_time) {
1028 evsel->attr.read_format |=
1029 PERF_FORMAT_TOTAL_TIME_ENABLED |
1030 PERF_FORMAT_TOTAL_TIME_RUNNING;
1031 }
1032
1033 /*
1034 * XXX see the function comment above
1035 *
1036 * Disabling only independent events or group leaders,
1037 * keeping group members enabled.
1038 */
1039 if (perf_evsel__is_group_leader(evsel))
1040 attr->disabled = 1;
1041
1042 /*
1043 * Setting enable_on_exec for independent events and
1044 * group leaders for traced executed by perf.
1045 */
1046 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1047 !opts->initial_delay)
1048 attr->enable_on_exec = 1;
1049
1050 if (evsel->immediate) {
1051 attr->disabled = 0;
1052 attr->enable_on_exec = 0;
1053 }
1054
1055 clockid = opts->clockid;
1056 if (opts->use_clockid) {
1057 attr->use_clockid = 1;
1058 attr->clockid = opts->clockid;
1059 }
1060
1061 if (evsel->precise_max)
1062 perf_event_attr__set_max_precise_ip(attr);
1063
1064 if (opts->all_user) {
1065 attr->exclude_kernel = 1;
1066 attr->exclude_user = 0;
1067 }
1068
1069 if (opts->all_kernel) {
1070 attr->exclude_kernel = 0;
1071 attr->exclude_user = 1;
1072 }
1073
1074 /*
1075 * Apply event specific term settings,
1076 * it overloads any global configuration.
1077 */
1078 apply_config_terms(evsel, opts, track);
1079
1080 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1081
1082 /* The --period option takes the precedence. */
1083 if (opts->period_set) {
1084 if (opts->period)
1085 perf_evsel__set_sample_bit(evsel, PERIOD);
1086 else
1087 perf_evsel__reset_sample_bit(evsel, PERIOD);
1088 }
1089 }
1090
1091 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1092 {
1093 if (evsel->system_wide)
1094 nthreads = 1;
1095
1096 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1097
1098 if (evsel->fd) {
1099 int cpu, thread;
1100 for (cpu = 0; cpu < ncpus; cpu++) {
1101 for (thread = 0; thread < nthreads; thread++) {
1102 FD(evsel, cpu, thread) = -1;
1103 }
1104 }
1105 }
1106
1107 return evsel->fd != NULL ? 0 : -ENOMEM;
1108 }
1109
1110 static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
1111 int ioc, void *arg)
1112 {
1113 int cpu, thread;
1114
1115 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
1116 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
1117 int fd = FD(evsel, cpu, thread),
1118 err = ioctl(fd, ioc, arg);
1119
1120 if (err)
1121 return err;
1122 }
1123 }
1124
1125 return 0;
1126 }
1127
1128 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
1129 {
1130 return perf_evsel__run_ioctl(evsel,
1131 PERF_EVENT_IOC_SET_FILTER,
1132 (void *)filter);
1133 }
1134
1135 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1136 {
1137 char *new_filter = strdup(filter);
1138
1139 if (new_filter != NULL) {
1140 free(evsel->filter);
1141 evsel->filter = new_filter;
1142 return 0;
1143 }
1144
1145 return -1;
1146 }
1147
1148 static int perf_evsel__append_filter(struct perf_evsel *evsel,
1149 const char *fmt, const char *filter)
1150 {
1151 char *new_filter;
1152
1153 if (evsel->filter == NULL)
1154 return perf_evsel__set_filter(evsel, filter);
1155
1156 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1157 free(evsel->filter);
1158 evsel->filter = new_filter;
1159 return 0;
1160 }
1161
1162 return -1;
1163 }
1164
1165 int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1166 {
1167 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1168 }
1169
1170 int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1171 {
1172 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1173 }
1174
1175 int perf_evsel__enable(struct perf_evsel *evsel)
1176 {
1177 return perf_evsel__run_ioctl(evsel,
1178 PERF_EVENT_IOC_ENABLE,
1179 0);
1180 }
1181
1182 int perf_evsel__disable(struct perf_evsel *evsel)
1183 {
1184 return perf_evsel__run_ioctl(evsel,
1185 PERF_EVENT_IOC_DISABLE,
1186 0);
1187 }
1188
1189 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1190 {
1191 if (ncpus == 0 || nthreads == 0)
1192 return 0;
1193
1194 if (evsel->system_wide)
1195 nthreads = 1;
1196
1197 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1198 if (evsel->sample_id == NULL)
1199 return -ENOMEM;
1200
1201 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1202 if (evsel->id == NULL) {
1203 xyarray__delete(evsel->sample_id);
1204 evsel->sample_id = NULL;
1205 return -ENOMEM;
1206 }
1207
1208 return 0;
1209 }
1210
1211 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1212 {
1213 xyarray__delete(evsel->fd);
1214 evsel->fd = NULL;
1215 }
1216
1217 static void perf_evsel__free_id(struct perf_evsel *evsel)
1218 {
1219 xyarray__delete(evsel->sample_id);
1220 evsel->sample_id = NULL;
1221 zfree(&evsel->id);
1222 }
1223
1224 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1225 {
1226 struct perf_evsel_config_term *term, *h;
1227
1228 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1229 list_del(&term->list);
1230 free(term);
1231 }
1232 }
1233
1234 void perf_evsel__close_fd(struct perf_evsel *evsel)
1235 {
1236 int cpu, thread;
1237
1238 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
1239 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
1240 close(FD(evsel, cpu, thread));
1241 FD(evsel, cpu, thread) = -1;
1242 }
1243 }
1244
1245 void perf_evsel__exit(struct perf_evsel *evsel)
1246 {
1247 assert(list_empty(&evsel->node));
1248 assert(evsel->evlist == NULL);
1249 perf_evsel__free_fd(evsel);
1250 perf_evsel__free_id(evsel);
1251 perf_evsel__free_config_terms(evsel);
1252 cgroup__put(evsel->cgrp);
1253 cpu_map__put(evsel->cpus);
1254 cpu_map__put(evsel->own_cpus);
1255 thread_map__put(evsel->threads);
1256 zfree(&evsel->group_name);
1257 zfree(&evsel->name);
1258 perf_evsel__object.fini(evsel);
1259 }
1260
1261 void perf_evsel__delete(struct perf_evsel *evsel)
1262 {
1263 perf_evsel__exit(evsel);
1264 free(evsel);
1265 }
1266
1267 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1268 struct perf_counts_values *count)
1269 {
1270 struct perf_counts_values tmp;
1271
1272 if (!evsel->prev_raw_counts)
1273 return;
1274
1275 if (cpu == -1) {
1276 tmp = evsel->prev_raw_counts->aggr;
1277 evsel->prev_raw_counts->aggr = *count;
1278 } else {
1279 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1280 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1281 }
1282
1283 count->val = count->val - tmp.val;
1284 count->ena = count->ena - tmp.ena;
1285 count->run = count->run - tmp.run;
1286 }
1287
1288 void perf_counts_values__scale(struct perf_counts_values *count,
1289 bool scale, s8 *pscaled)
1290 {
1291 s8 scaled = 0;
1292
1293 if (scale) {
1294 if (count->run == 0) {
1295 scaled = -1;
1296 count->val = 0;
1297 } else if (count->run < count->ena) {
1298 scaled = 1;
1299 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1300 }
1301 } else
1302 count->ena = count->run = 0;
1303
1304 if (pscaled)
1305 *pscaled = scaled;
1306 }
1307
1308 static int perf_evsel__read_size(struct perf_evsel *evsel)
1309 {
1310 u64 read_format = evsel->attr.read_format;
1311 int entry = sizeof(u64); /* value */
1312 int size = 0;
1313 int nr = 1;
1314
1315 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1316 size += sizeof(u64);
1317
1318 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1319 size += sizeof(u64);
1320
1321 if (read_format & PERF_FORMAT_ID)
1322 entry += sizeof(u64);
1323
1324 if (read_format & PERF_FORMAT_GROUP) {
1325 nr = evsel->nr_members;
1326 size += sizeof(u64);
1327 }
1328
1329 size += entry * nr;
1330 return size;
1331 }
1332
1333 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1334 struct perf_counts_values *count)
1335 {
1336 size_t size = perf_evsel__read_size(evsel);
1337
1338 memset(count, 0, sizeof(*count));
1339
1340 if (FD(evsel, cpu, thread) < 0)
1341 return -EINVAL;
1342
1343 if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
1344 return -errno;
1345
1346 return 0;
1347 }
1348
1349 static int
1350 perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
1351 {
1352 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1353
1354 return perf_evsel__read(evsel, cpu, thread, count);
1355 }
1356
1357 static void
1358 perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
1359 u64 val, u64 ena, u64 run)
1360 {
1361 struct perf_counts_values *count;
1362
1363 count = perf_counts(counter->counts, cpu, thread);
1364
1365 count->val = val;
1366 count->ena = ena;
1367 count->run = run;
1368 count->loaded = true;
1369 }
1370
1371 static int
1372 perf_evsel__process_group_data(struct perf_evsel *leader,
1373 int cpu, int thread, u64 *data)
1374 {
1375 u64 read_format = leader->attr.read_format;
1376 struct sample_read_value *v;
1377 u64 nr, ena = 0, run = 0, i;
1378
1379 nr = *data++;
1380
1381 if (nr != (u64) leader->nr_members)
1382 return -EINVAL;
1383
1384 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1385 ena = *data++;
1386
1387 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1388 run = *data++;
1389
1390 v = (struct sample_read_value *) data;
1391
1392 perf_evsel__set_count(leader, cpu, thread,
1393 v[0].value, ena, run);
1394
1395 for (i = 1; i < nr; i++) {
1396 struct perf_evsel *counter;
1397
1398 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1399 if (!counter)
1400 return -EINVAL;
1401
1402 perf_evsel__set_count(counter, cpu, thread,
1403 v[i].value, ena, run);
1404 }
1405
1406 return 0;
1407 }
1408
1409 static int
1410 perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
1411 {
1412 struct perf_stat_evsel *ps = leader->stats;
1413 u64 read_format = leader->attr.read_format;
1414 int size = perf_evsel__read_size(leader);
1415 u64 *data = ps->group_data;
1416
1417 if (!(read_format & PERF_FORMAT_ID))
1418 return -EINVAL;
1419
1420 if (!perf_evsel__is_group_leader(leader))
1421 return -EINVAL;
1422
1423 if (!data) {
1424 data = zalloc(size);
1425 if (!data)
1426 return -ENOMEM;
1427
1428 ps->group_data = data;
1429 }
1430
1431 if (FD(leader, cpu, thread) < 0)
1432 return -EINVAL;
1433
1434 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1435 return -errno;
1436
1437 return perf_evsel__process_group_data(leader, cpu, thread, data);
1438 }
1439
1440 int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
1441 {
1442 u64 read_format = evsel->attr.read_format;
1443
1444 if (read_format & PERF_FORMAT_GROUP)
1445 return perf_evsel__read_group(evsel, cpu, thread);
1446 else
1447 return perf_evsel__read_one(evsel, cpu, thread);
1448 }
1449
1450 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1451 int cpu, int thread, bool scale)
1452 {
1453 struct perf_counts_values count;
1454 size_t nv = scale ? 3 : 1;
1455
1456 if (FD(evsel, cpu, thread) < 0)
1457 return -EINVAL;
1458
1459 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1460 return -ENOMEM;
1461
1462 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1463 return -errno;
1464
1465 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1466 perf_counts_values__scale(&count, scale, NULL);
1467 *perf_counts(evsel->counts, cpu, thread) = count;
1468 return 0;
1469 }
1470
1471 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1472 {
1473 struct perf_evsel *leader = evsel->leader;
1474 int fd;
1475
1476 if (perf_evsel__is_group_leader(evsel))
1477 return -1;
1478
1479 /*
1480 * Leader must be already processed/open,
1481 * if not it's a bug.
1482 */
1483 BUG_ON(!leader->fd);
1484
1485 fd = FD(leader, cpu, thread);
1486 BUG_ON(fd == -1);
1487
1488 return fd;
1489 }
1490
1491 struct bit_names {
1492 int bit;
1493 const char *name;
1494 };
1495
1496 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1497 {
1498 bool first_bit = true;
1499 int i = 0;
1500
1501 do {
1502 if (value & bits[i].bit) {
1503 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1504 first_bit = false;
1505 }
1506 } while (bits[++i].name != NULL);
1507 }
1508
1509 static void __p_sample_type(char *buf, size_t size, u64 value)
1510 {
1511 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1512 struct bit_names bits[] = {
1513 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1514 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1515 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1516 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1517 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1518 bit_name(WEIGHT), bit_name(PHYS_ADDR),
1519 { .name = NULL, }
1520 };
1521 #undef bit_name
1522 __p_bits(buf, size, value, bits);
1523 }
1524
1525 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1526 {
1527 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1528 struct bit_names bits[] = {
1529 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1530 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1531 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1532 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1533 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1534 { .name = NULL, }
1535 };
1536 #undef bit_name
1537 __p_bits(buf, size, value, bits);
1538 }
1539
1540 static void __p_read_format(char *buf, size_t size, u64 value)
1541 {
1542 #define bit_name(n) { PERF_FORMAT_##n, #n }
1543 struct bit_names bits[] = {
1544 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1545 bit_name(ID), bit_name(GROUP),
1546 { .name = NULL, }
1547 };
1548 #undef bit_name
1549 __p_bits(buf, size, value, bits);
1550 }
1551
1552 #define BUF_SIZE 1024
1553
1554 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1555 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1556 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1557 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1558 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1559 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1560
1561 #define PRINT_ATTRn(_n, _f, _p) \
1562 do { \
1563 if (attr->_f) { \
1564 _p(attr->_f); \
1565 ret += attr__fprintf(fp, _n, buf, priv);\
1566 } \
1567 } while (0)
1568
1569 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1570
1571 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1572 attr__fprintf_f attr__fprintf, void *priv)
1573 {
1574 char buf[BUF_SIZE];
1575 int ret = 0;
1576
1577 PRINT_ATTRf(type, p_unsigned);
1578 PRINT_ATTRf(size, p_unsigned);
1579 PRINT_ATTRf(config, p_hex);
1580 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1581 PRINT_ATTRf(sample_type, p_sample_type);
1582 PRINT_ATTRf(read_format, p_read_format);
1583
1584 PRINT_ATTRf(disabled, p_unsigned);
1585 PRINT_ATTRf(inherit, p_unsigned);
1586 PRINT_ATTRf(pinned, p_unsigned);
1587 PRINT_ATTRf(exclusive, p_unsigned);
1588 PRINT_ATTRf(exclude_user, p_unsigned);
1589 PRINT_ATTRf(exclude_kernel, p_unsigned);
1590 PRINT_ATTRf(exclude_hv, p_unsigned);
1591 PRINT_ATTRf(exclude_idle, p_unsigned);
1592 PRINT_ATTRf(mmap, p_unsigned);
1593 PRINT_ATTRf(comm, p_unsigned);
1594 PRINT_ATTRf(freq, p_unsigned);
1595 PRINT_ATTRf(inherit_stat, p_unsigned);
1596 PRINT_ATTRf(enable_on_exec, p_unsigned);
1597 PRINT_ATTRf(task, p_unsigned);
1598 PRINT_ATTRf(watermark, p_unsigned);
1599 PRINT_ATTRf(precise_ip, p_unsigned);
1600 PRINT_ATTRf(mmap_data, p_unsigned);
1601 PRINT_ATTRf(sample_id_all, p_unsigned);
1602 PRINT_ATTRf(exclude_host, p_unsigned);
1603 PRINT_ATTRf(exclude_guest, p_unsigned);
1604 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1605 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1606 PRINT_ATTRf(mmap2, p_unsigned);
1607 PRINT_ATTRf(comm_exec, p_unsigned);
1608 PRINT_ATTRf(use_clockid, p_unsigned);
1609 PRINT_ATTRf(context_switch, p_unsigned);
1610 PRINT_ATTRf(write_backward, p_unsigned);
1611 PRINT_ATTRf(namespaces, p_unsigned);
1612
1613 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1614 PRINT_ATTRf(bp_type, p_unsigned);
1615 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1616 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1617 PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1618 PRINT_ATTRf(sample_regs_user, p_hex);
1619 PRINT_ATTRf(sample_stack_user, p_unsigned);
1620 PRINT_ATTRf(clockid, p_signed);
1621 PRINT_ATTRf(sample_regs_intr, p_hex);
1622 PRINT_ATTRf(aux_watermark, p_unsigned);
1623 PRINT_ATTRf(sample_max_stack, p_unsigned);
1624
1625 return ret;
1626 }
1627
1628 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1629 void *priv __maybe_unused)
1630 {
1631 return fprintf(fp, " %-32s %s\n", name, val);
1632 }
1633
1634 static void perf_evsel__remove_fd(struct perf_evsel *pos,
1635 int nr_cpus, int nr_threads,
1636 int thread_idx)
1637 {
1638 for (int cpu = 0; cpu < nr_cpus; cpu++)
1639 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1640 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1641 }
1642
1643 static int update_fds(struct perf_evsel *evsel,
1644 int nr_cpus, int cpu_idx,
1645 int nr_threads, int thread_idx)
1646 {
1647 struct perf_evsel *pos;
1648
1649 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1650 return -EINVAL;
1651
1652 evlist__for_each_entry(evsel->evlist, pos) {
1653 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1654
1655 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1656
1657 /*
1658 * Since fds for next evsel has not been created,
1659 * there is no need to iterate whole event list.
1660 */
1661 if (pos == evsel)
1662 break;
1663 }
1664 return 0;
1665 }
1666
1667 static bool ignore_missing_thread(struct perf_evsel *evsel,
1668 int nr_cpus, int cpu,
1669 struct thread_map *threads,
1670 int thread, int err)
1671 {
1672 pid_t ignore_pid = thread_map__pid(threads, thread);
1673
1674 if (!evsel->ignore_missing_thread)
1675 return false;
1676
1677 /* The system wide setup does not work with threads. */
1678 if (evsel->system_wide)
1679 return false;
1680
1681 /* The -ESRCH is perf event syscall errno for pid's not found. */
1682 if (err != -ESRCH)
1683 return false;
1684
1685 /* If there's only one thread, let it fail. */
1686 if (threads->nr == 1)
1687 return false;
1688
1689 /*
1690 * We should remove fd for missing_thread first
1691 * because thread_map__remove() will decrease threads->nr.
1692 */
1693 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1694 return false;
1695
1696 if (thread_map__remove(threads, thread))
1697 return false;
1698
1699 pr_warning("WARNING: Ignored open failure for pid %d\n",
1700 ignore_pid);
1701 return true;
1702 }
1703
1704 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1705 struct thread_map *threads)
1706 {
1707 int cpu, thread, nthreads;
1708 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1709 int pid = -1, err;
1710 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1711
1712 if (perf_missing_features.write_backward && evsel->attr.write_backward)
1713 return -EINVAL;
1714
1715 if (cpus == NULL) {
1716 static struct cpu_map *empty_cpu_map;
1717
1718 if (empty_cpu_map == NULL) {
1719 empty_cpu_map = cpu_map__dummy_new();
1720 if (empty_cpu_map == NULL)
1721 return -ENOMEM;
1722 }
1723
1724 cpus = empty_cpu_map;
1725 }
1726
1727 if (threads == NULL) {
1728 static struct thread_map *empty_thread_map;
1729
1730 if (empty_thread_map == NULL) {
1731 empty_thread_map = thread_map__new_by_tid(-1);
1732 if (empty_thread_map == NULL)
1733 return -ENOMEM;
1734 }
1735
1736 threads = empty_thread_map;
1737 }
1738
1739 if (evsel->system_wide)
1740 nthreads = 1;
1741 else
1742 nthreads = threads->nr;
1743
1744 if (evsel->fd == NULL &&
1745 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1746 return -ENOMEM;
1747
1748 if (evsel->cgrp) {
1749 flags |= PERF_FLAG_PID_CGROUP;
1750 pid = evsel->cgrp->fd;
1751 }
1752
1753 fallback_missing_features:
1754 if (perf_missing_features.clockid_wrong)
1755 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1756 if (perf_missing_features.clockid) {
1757 evsel->attr.use_clockid = 0;
1758 evsel->attr.clockid = 0;
1759 }
1760 if (perf_missing_features.cloexec)
1761 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1762 if (perf_missing_features.mmap2)
1763 evsel->attr.mmap2 = 0;
1764 if (perf_missing_features.exclude_guest)
1765 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1766 if (perf_missing_features.lbr_flags)
1767 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1768 PERF_SAMPLE_BRANCH_NO_CYCLES);
1769 if (perf_missing_features.group_read && evsel->attr.inherit)
1770 evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1771 retry_sample_id:
1772 if (perf_missing_features.sample_id_all)
1773 evsel->attr.sample_id_all = 0;
1774
1775 if (verbose >= 2) {
1776 fprintf(stderr, "%.60s\n", graph_dotted_line);
1777 fprintf(stderr, "perf_event_attr:\n");
1778 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1779 fprintf(stderr, "%.60s\n", graph_dotted_line);
1780 }
1781
1782 for (cpu = 0; cpu < cpus->nr; cpu++) {
1783
1784 for (thread = 0; thread < nthreads; thread++) {
1785 int fd, group_fd;
1786
1787 if (!evsel->cgrp && !evsel->system_wide)
1788 pid = thread_map__pid(threads, thread);
1789
1790 group_fd = get_group_fd(evsel, cpu, thread);
1791 retry_open:
1792 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1793 pid, cpus->map[cpu], group_fd, flags);
1794
1795 test_attr__ready();
1796
1797 fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
1798 group_fd, flags);
1799
1800 FD(evsel, cpu, thread) = fd;
1801
1802 if (fd < 0) {
1803 err = -errno;
1804
1805 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1806 /*
1807 * We just removed 1 thread, so take a step
1808 * back on thread index and lower the upper
1809 * nthreads limit.
1810 */
1811 nthreads--;
1812 thread--;
1813
1814 /* ... and pretend like nothing have happened. */
1815 err = 0;
1816 continue;
1817 }
1818
1819 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1820 err);
1821 goto try_fallback;
1822 }
1823
1824 pr_debug2(" = %d\n", fd);
1825
1826 if (evsel->bpf_fd >= 0) {
1827 int evt_fd = fd;
1828 int bpf_fd = evsel->bpf_fd;
1829
1830 err = ioctl(evt_fd,
1831 PERF_EVENT_IOC_SET_BPF,
1832 bpf_fd);
1833 if (err && errno != EEXIST) {
1834 pr_err("failed to attach bpf fd %d: %s\n",
1835 bpf_fd, strerror(errno));
1836 err = -EINVAL;
1837 goto out_close;
1838 }
1839 }
1840
1841 set_rlimit = NO_CHANGE;
1842
1843 /*
1844 * If we succeeded but had to kill clockid, fail and
1845 * have perf_evsel__open_strerror() print us a nice
1846 * error.
1847 */
1848 if (perf_missing_features.clockid ||
1849 perf_missing_features.clockid_wrong) {
1850 err = -EINVAL;
1851 goto out_close;
1852 }
1853 }
1854 }
1855
1856 return 0;
1857
1858 try_fallback:
1859 /*
1860 * perf stat needs between 5 and 22 fds per CPU. When we run out
1861 * of them try to increase the limits.
1862 */
1863 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1864 struct rlimit l;
1865 int old_errno = errno;
1866
1867 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1868 if (set_rlimit == NO_CHANGE)
1869 l.rlim_cur = l.rlim_max;
1870 else {
1871 l.rlim_cur = l.rlim_max + 1000;
1872 l.rlim_max = l.rlim_cur;
1873 }
1874 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1875 set_rlimit++;
1876 errno = old_errno;
1877 goto retry_open;
1878 }
1879 }
1880 errno = old_errno;
1881 }
1882
1883 if (err != -EINVAL || cpu > 0 || thread > 0)
1884 goto out_close;
1885
1886 /*
1887 * Must probe features in the order they were added to the
1888 * perf_event_attr interface.
1889 */
1890 if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1891 perf_missing_features.write_backward = true;
1892 pr_debug2("switching off write_backward\n");
1893 goto out_close;
1894 } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1895 perf_missing_features.clockid_wrong = true;
1896 pr_debug2("switching off clockid\n");
1897 goto fallback_missing_features;
1898 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1899 perf_missing_features.clockid = true;
1900 pr_debug2("switching off use_clockid\n");
1901 goto fallback_missing_features;
1902 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1903 perf_missing_features.cloexec = true;
1904 pr_debug2("switching off cloexec flag\n");
1905 goto fallback_missing_features;
1906 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1907 perf_missing_features.mmap2 = true;
1908 pr_debug2("switching off mmap2\n");
1909 goto fallback_missing_features;
1910 } else if (!perf_missing_features.exclude_guest &&
1911 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1912 perf_missing_features.exclude_guest = true;
1913 pr_debug2("switching off exclude_guest, exclude_host\n");
1914 goto fallback_missing_features;
1915 } else if (!perf_missing_features.sample_id_all) {
1916 perf_missing_features.sample_id_all = true;
1917 pr_debug2("switching off sample_id_all\n");
1918 goto retry_sample_id;
1919 } else if (!perf_missing_features.lbr_flags &&
1920 (evsel->attr.branch_sample_type &
1921 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1922 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1923 perf_missing_features.lbr_flags = true;
1924 pr_debug2("switching off branch sample type no (cycles/flags)\n");
1925 goto fallback_missing_features;
1926 } else if (!perf_missing_features.group_read &&
1927 evsel->attr.inherit &&
1928 (evsel->attr.read_format & PERF_FORMAT_GROUP) &&
1929 perf_evsel__is_group_leader(evsel)) {
1930 perf_missing_features.group_read = true;
1931 pr_debug2("switching off group read\n");
1932 goto fallback_missing_features;
1933 }
1934 out_close:
1935 if (err)
1936 threads->err_thread = thread;
1937
1938 do {
1939 while (--thread >= 0) {
1940 close(FD(evsel, cpu, thread));
1941 FD(evsel, cpu, thread) = -1;
1942 }
1943 thread = nthreads;
1944 } while (--cpu >= 0);
1945 return err;
1946 }
1947
1948 void perf_evsel__close(struct perf_evsel *evsel)
1949 {
1950 if (evsel->fd == NULL)
1951 return;
1952
1953 perf_evsel__close_fd(evsel);
1954 perf_evsel__free_fd(evsel);
1955 }
1956
1957 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1958 struct cpu_map *cpus)
1959 {
1960 return perf_evsel__open(evsel, cpus, NULL);
1961 }
1962
1963 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1964 struct thread_map *threads)
1965 {
1966 return perf_evsel__open(evsel, NULL, threads);
1967 }
1968
1969 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1970 const union perf_event *event,
1971 struct perf_sample *sample)
1972 {
1973 u64 type = evsel->attr.sample_type;
1974 const u64 *array = event->sample.array;
1975 bool swapped = evsel->needs_swap;
1976 union u64_swap u;
1977
1978 array += ((event->header.size -
1979 sizeof(event->header)) / sizeof(u64)) - 1;
1980
1981 if (type & PERF_SAMPLE_IDENTIFIER) {
1982 sample->id = *array;
1983 array--;
1984 }
1985
1986 if (type & PERF_SAMPLE_CPU) {
1987 u.val64 = *array;
1988 if (swapped) {
1989 /* undo swap of u64, then swap on individual u32s */
1990 u.val64 = bswap_64(u.val64);
1991 u.val32[0] = bswap_32(u.val32[0]);
1992 }
1993
1994 sample->cpu = u.val32[0];
1995 array--;
1996 }
1997
1998 if (type & PERF_SAMPLE_STREAM_ID) {
1999 sample->stream_id = *array;
2000 array--;
2001 }
2002
2003 if (type & PERF_SAMPLE_ID) {
2004 sample->id = *array;
2005 array--;
2006 }
2007
2008 if (type & PERF_SAMPLE_TIME) {
2009 sample->time = *array;
2010 array--;
2011 }
2012
2013 if (type & PERF_SAMPLE_TID) {
2014 u.val64 = *array;
2015 if (swapped) {
2016 /* undo swap of u64, then swap on individual u32s */
2017 u.val64 = bswap_64(u.val64);
2018 u.val32[0] = bswap_32(u.val32[0]);
2019 u.val32[1] = bswap_32(u.val32[1]);
2020 }
2021
2022 sample->pid = u.val32[0];
2023 sample->tid = u.val32[1];
2024 array--;
2025 }
2026
2027 return 0;
2028 }
2029
2030 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2031 u64 size)
2032 {
2033 return size > max_size || offset + size > endp;
2034 }
2035
2036 #define OVERFLOW_CHECK(offset, size, max_size) \
2037 do { \
2038 if (overflow(endp, (max_size), (offset), (size))) \
2039 return -EFAULT; \
2040 } while (0)
2041
2042 #define OVERFLOW_CHECK_u64(offset) \
2043 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2044
2045 static int
2046 perf_event__check_size(union perf_event *event, unsigned int sample_size)
2047 {
2048 /*
2049 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2050 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2051 * check the format does not go past the end of the event.
2052 */
2053 if (sample_size + sizeof(event->header) > event->header.size)
2054 return -EFAULT;
2055
2056 return 0;
2057 }
2058
2059 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
2060 struct perf_sample *data)
2061 {
2062 u64 type = evsel->attr.sample_type;
2063 bool swapped = evsel->needs_swap;
2064 const u64 *array;
2065 u16 max_size = event->header.size;
2066 const void *endp = (void *)event + max_size;
2067 u64 sz;
2068
2069 /*
2070 * used for cross-endian analysis. See git commit 65014ab3
2071 * for why this goofiness is needed.
2072 */
2073 union u64_swap u;
2074
2075 memset(data, 0, sizeof(*data));
2076 data->cpu = data->pid = data->tid = -1;
2077 data->stream_id = data->id = data->time = -1ULL;
2078 data->period = evsel->attr.sample_period;
2079 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2080 data->misc = event->header.misc;
2081 data->id = -1ULL;
2082 data->data_src = PERF_MEM_DATA_SRC_NONE;
2083
2084 if (event->header.type != PERF_RECORD_SAMPLE) {
2085 if (!evsel->attr.sample_id_all)
2086 return 0;
2087 return perf_evsel__parse_id_sample(evsel, event, data);
2088 }
2089
2090 array = event->sample.array;
2091
2092 if (perf_event__check_size(event, evsel->sample_size))
2093 return -EFAULT;
2094
2095 if (type & PERF_SAMPLE_IDENTIFIER) {
2096 data->id = *array;
2097 array++;
2098 }
2099
2100 if (type & PERF_SAMPLE_IP) {
2101 data->ip = *array;
2102 array++;
2103 }
2104
2105 if (type & PERF_SAMPLE_TID) {
2106 u.val64 = *array;
2107 if (swapped) {
2108 /* undo swap of u64, then swap on individual u32s */
2109 u.val64 = bswap_64(u.val64);
2110 u.val32[0] = bswap_32(u.val32[0]);
2111 u.val32[1] = bswap_32(u.val32[1]);
2112 }
2113
2114 data->pid = u.val32[0];
2115 data->tid = u.val32[1];
2116 array++;
2117 }
2118
2119 if (type & PERF_SAMPLE_TIME) {
2120 data->time = *array;
2121 array++;
2122 }
2123
2124 if (type & PERF_SAMPLE_ADDR) {
2125 data->addr = *array;
2126 array++;
2127 }
2128
2129 if (type & PERF_SAMPLE_ID) {
2130 data->id = *array;
2131 array++;
2132 }
2133
2134 if (type & PERF_SAMPLE_STREAM_ID) {
2135 data->stream_id = *array;
2136 array++;
2137 }
2138
2139 if (type & PERF_SAMPLE_CPU) {
2140
2141 u.val64 = *array;
2142 if (swapped) {
2143 /* undo swap of u64, then swap on individual u32s */
2144 u.val64 = bswap_64(u.val64);
2145 u.val32[0] = bswap_32(u.val32[0]);
2146 }
2147
2148 data->cpu = u.val32[0];
2149 array++;
2150 }
2151
2152 if (type & PERF_SAMPLE_PERIOD) {
2153 data->period = *array;
2154 array++;
2155 }
2156
2157 if (type & PERF_SAMPLE_READ) {
2158 u64 read_format = evsel->attr.read_format;
2159
2160 OVERFLOW_CHECK_u64(array);
2161 if (read_format & PERF_FORMAT_GROUP)
2162 data->read.group.nr = *array;
2163 else
2164 data->read.one.value = *array;
2165
2166 array++;
2167
2168 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2169 OVERFLOW_CHECK_u64(array);
2170 data->read.time_enabled = *array;
2171 array++;
2172 }
2173
2174 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2175 OVERFLOW_CHECK_u64(array);
2176 data->read.time_running = *array;
2177 array++;
2178 }
2179
2180 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2181 if (read_format & PERF_FORMAT_GROUP) {
2182 const u64 max_group_nr = UINT64_MAX /
2183 sizeof(struct sample_read_value);
2184
2185 if (data->read.group.nr > max_group_nr)
2186 return -EFAULT;
2187 sz = data->read.group.nr *
2188 sizeof(struct sample_read_value);
2189 OVERFLOW_CHECK(array, sz, max_size);
2190 data->read.group.values =
2191 (struct sample_read_value *)array;
2192 array = (void *)array + sz;
2193 } else {
2194 OVERFLOW_CHECK_u64(array);
2195 data->read.one.id = *array;
2196 array++;
2197 }
2198 }
2199
2200 if (type & PERF_SAMPLE_CALLCHAIN) {
2201 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2202
2203 OVERFLOW_CHECK_u64(array);
2204 data->callchain = (struct ip_callchain *)array++;
2205 if (data->callchain->nr > max_callchain_nr)
2206 return -EFAULT;
2207 sz = data->callchain->nr * sizeof(u64);
2208 OVERFLOW_CHECK(array, sz, max_size);
2209 array = (void *)array + sz;
2210 }
2211
2212 if (type & PERF_SAMPLE_RAW) {
2213 OVERFLOW_CHECK_u64(array);
2214 u.val64 = *array;
2215
2216 /*
2217 * Undo swap of u64, then swap on individual u32s,
2218 * get the size of the raw area and undo all of the
2219 * swap. The pevent interface handles endianity by
2220 * itself.
2221 */
2222 if (swapped) {
2223 u.val64 = bswap_64(u.val64);
2224 u.val32[0] = bswap_32(u.val32[0]);
2225 u.val32[1] = bswap_32(u.val32[1]);
2226 }
2227 data->raw_size = u.val32[0];
2228
2229 /*
2230 * The raw data is aligned on 64bits including the
2231 * u32 size, so it's safe to use mem_bswap_64.
2232 */
2233 if (swapped)
2234 mem_bswap_64((void *) array, data->raw_size);
2235
2236 array = (void *)array + sizeof(u32);
2237
2238 OVERFLOW_CHECK(array, data->raw_size, max_size);
2239 data->raw_data = (void *)array;
2240 array = (void *)array + data->raw_size;
2241 }
2242
2243 if (type & PERF_SAMPLE_BRANCH_STACK) {
2244 const u64 max_branch_nr = UINT64_MAX /
2245 sizeof(struct branch_entry);
2246
2247 OVERFLOW_CHECK_u64(array);
2248 data->branch_stack = (struct branch_stack *)array++;
2249
2250 if (data->branch_stack->nr > max_branch_nr)
2251 return -EFAULT;
2252 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2253 OVERFLOW_CHECK(array, sz, max_size);
2254 array = (void *)array + sz;
2255 }
2256
2257 if (type & PERF_SAMPLE_REGS_USER) {
2258 OVERFLOW_CHECK_u64(array);
2259 data->user_regs.abi = *array;
2260 array++;
2261
2262 if (data->user_regs.abi) {
2263 u64 mask = evsel->attr.sample_regs_user;
2264
2265 sz = hweight_long(mask) * sizeof(u64);
2266 OVERFLOW_CHECK(array, sz, max_size);
2267 data->user_regs.mask = mask;
2268 data->user_regs.regs = (u64 *)array;
2269 array = (void *)array + sz;
2270 }
2271 }
2272
2273 if (type & PERF_SAMPLE_STACK_USER) {
2274 OVERFLOW_CHECK_u64(array);
2275 sz = *array++;
2276
2277 data->user_stack.offset = ((char *)(array - 1)
2278 - (char *) event);
2279
2280 if (!sz) {
2281 data->user_stack.size = 0;
2282 } else {
2283 OVERFLOW_CHECK(array, sz, max_size);
2284 data->user_stack.data = (char *)array;
2285 array = (void *)array + sz;
2286 OVERFLOW_CHECK_u64(array);
2287 data->user_stack.size = *array++;
2288 if (WARN_ONCE(data->user_stack.size > sz,
2289 "user stack dump failure\n"))
2290 return -EFAULT;
2291 }
2292 }
2293
2294 if (type & PERF_SAMPLE_WEIGHT) {
2295 OVERFLOW_CHECK_u64(array);
2296 data->weight = *array;
2297 array++;
2298 }
2299
2300 if (type & PERF_SAMPLE_DATA_SRC) {
2301 OVERFLOW_CHECK_u64(array);
2302 data->data_src = *array;
2303 array++;
2304 }
2305
2306 if (type & PERF_SAMPLE_TRANSACTION) {
2307 OVERFLOW_CHECK_u64(array);
2308 data->transaction = *array;
2309 array++;
2310 }
2311
2312 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2313 if (type & PERF_SAMPLE_REGS_INTR) {
2314 OVERFLOW_CHECK_u64(array);
2315 data->intr_regs.abi = *array;
2316 array++;
2317
2318 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2319 u64 mask = evsel->attr.sample_regs_intr;
2320
2321 sz = hweight_long(mask) * sizeof(u64);
2322 OVERFLOW_CHECK(array, sz, max_size);
2323 data->intr_regs.mask = mask;
2324 data->intr_regs.regs = (u64 *)array;
2325 array = (void *)array + sz;
2326 }
2327 }
2328
2329 data->phys_addr = 0;
2330 if (type & PERF_SAMPLE_PHYS_ADDR) {
2331 data->phys_addr = *array;
2332 array++;
2333 }
2334
2335 return 0;
2336 }
2337
2338 int perf_evsel__parse_sample_timestamp(struct perf_evsel *evsel,
2339 union perf_event *event,
2340 u64 *timestamp)
2341 {
2342 u64 type = evsel->attr.sample_type;
2343 const u64 *array;
2344
2345 if (!(type & PERF_SAMPLE_TIME))
2346 return -1;
2347
2348 if (event->header.type != PERF_RECORD_SAMPLE) {
2349 struct perf_sample data = {
2350 .time = -1ULL,
2351 };
2352
2353 if (!evsel->attr.sample_id_all)
2354 return -1;
2355 if (perf_evsel__parse_id_sample(evsel, event, &data))
2356 return -1;
2357
2358 *timestamp = data.time;
2359 return 0;
2360 }
2361
2362 array = event->sample.array;
2363
2364 if (perf_event__check_size(event, evsel->sample_size))
2365 return -EFAULT;
2366
2367 if (type & PERF_SAMPLE_IDENTIFIER)
2368 array++;
2369
2370 if (type & PERF_SAMPLE_IP)
2371 array++;
2372
2373 if (type & PERF_SAMPLE_TID)
2374 array++;
2375
2376 if (type & PERF_SAMPLE_TIME)
2377 *timestamp = *array;
2378
2379 return 0;
2380 }
2381
2382 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2383 u64 read_format)
2384 {
2385 size_t sz, result = sizeof(struct sample_event);
2386
2387 if (type & PERF_SAMPLE_IDENTIFIER)
2388 result += sizeof(u64);
2389
2390 if (type & PERF_SAMPLE_IP)
2391 result += sizeof(u64);
2392
2393 if (type & PERF_SAMPLE_TID)
2394 result += sizeof(u64);
2395
2396 if (type & PERF_SAMPLE_TIME)
2397 result += sizeof(u64);
2398
2399 if (type & PERF_SAMPLE_ADDR)
2400 result += sizeof(u64);
2401
2402 if (type & PERF_SAMPLE_ID)
2403 result += sizeof(u64);
2404
2405 if (type & PERF_SAMPLE_STREAM_ID)
2406 result += sizeof(u64);
2407
2408 if (type & PERF_SAMPLE_CPU)
2409 result += sizeof(u64);
2410
2411 if (type & PERF_SAMPLE_PERIOD)
2412 result += sizeof(u64);
2413
2414 if (type & PERF_SAMPLE_READ) {
2415 result += sizeof(u64);
2416 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2417 result += sizeof(u64);
2418 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2419 result += sizeof(u64);
2420 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2421 if (read_format & PERF_FORMAT_GROUP) {
2422 sz = sample->read.group.nr *
2423 sizeof(struct sample_read_value);
2424 result += sz;
2425 } else {
2426 result += sizeof(u64);
2427 }
2428 }
2429
2430 if (type & PERF_SAMPLE_CALLCHAIN) {
2431 sz = (sample->callchain->nr + 1) * sizeof(u64);
2432 result += sz;
2433 }
2434
2435 if (type & PERF_SAMPLE_RAW) {
2436 result += sizeof(u32);
2437 result += sample->raw_size;
2438 }
2439
2440 if (type & PERF_SAMPLE_BRANCH_STACK) {
2441 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2442 sz += sizeof(u64);
2443 result += sz;
2444 }
2445
2446 if (type & PERF_SAMPLE_REGS_USER) {
2447 if (sample->user_regs.abi) {
2448 result += sizeof(u64);
2449 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2450 result += sz;
2451 } else {
2452 result += sizeof(u64);
2453 }
2454 }
2455
2456 if (type & PERF_SAMPLE_STACK_USER) {
2457 sz = sample->user_stack.size;
2458 result += sizeof(u64);
2459 if (sz) {
2460 result += sz;
2461 result += sizeof(u64);
2462 }
2463 }
2464
2465 if (type & PERF_SAMPLE_WEIGHT)
2466 result += sizeof(u64);
2467
2468 if (type & PERF_SAMPLE_DATA_SRC)
2469 result += sizeof(u64);
2470
2471 if (type & PERF_SAMPLE_TRANSACTION)
2472 result += sizeof(u64);
2473
2474 if (type & PERF_SAMPLE_REGS_INTR) {
2475 if (sample->intr_regs.abi) {
2476 result += sizeof(u64);
2477 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2478 result += sz;
2479 } else {
2480 result += sizeof(u64);
2481 }
2482 }
2483
2484 if (type & PERF_SAMPLE_PHYS_ADDR)
2485 result += sizeof(u64);
2486
2487 return result;
2488 }
2489
2490 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2491 u64 read_format,
2492 const struct perf_sample *sample)
2493 {
2494 u64 *array;
2495 size_t sz;
2496 /*
2497 * used for cross-endian analysis. See git commit 65014ab3
2498 * for why this goofiness is needed.
2499 */
2500 union u64_swap u;
2501
2502 array = event->sample.array;
2503
2504 if (type & PERF_SAMPLE_IDENTIFIER) {
2505 *array = sample->id;
2506 array++;
2507 }
2508
2509 if (type & PERF_SAMPLE_IP) {
2510 *array = sample->ip;
2511 array++;
2512 }
2513
2514 if (type & PERF_SAMPLE_TID) {
2515 u.val32[0] = sample->pid;
2516 u.val32[1] = sample->tid;
2517 *array = u.val64;
2518 array++;
2519 }
2520
2521 if (type & PERF_SAMPLE_TIME) {
2522 *array = sample->time;
2523 array++;
2524 }
2525
2526 if (type & PERF_SAMPLE_ADDR) {
2527 *array = sample->addr;
2528 array++;
2529 }
2530
2531 if (type & PERF_SAMPLE_ID) {
2532 *array = sample->id;
2533 array++;
2534 }
2535
2536 if (type & PERF_SAMPLE_STREAM_ID) {
2537 *array = sample->stream_id;
2538 array++;
2539 }
2540
2541 if (type & PERF_SAMPLE_CPU) {
2542 u.val32[0] = sample->cpu;
2543 u.val32[1] = 0;
2544 *array = u.val64;
2545 array++;
2546 }
2547
2548 if (type & PERF_SAMPLE_PERIOD) {
2549 *array = sample->period;
2550 array++;
2551 }
2552
2553 if (type & PERF_SAMPLE_READ) {
2554 if (read_format & PERF_FORMAT_GROUP)
2555 *array = sample->read.group.nr;
2556 else
2557 *array = sample->read.one.value;
2558 array++;
2559
2560 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2561 *array = sample->read.time_enabled;
2562 array++;
2563 }
2564
2565 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2566 *array = sample->read.time_running;
2567 array++;
2568 }
2569
2570 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2571 if (read_format & PERF_FORMAT_GROUP) {
2572 sz = sample->read.group.nr *
2573 sizeof(struct sample_read_value);
2574 memcpy(array, sample->read.group.values, sz);
2575 array = (void *)array + sz;
2576 } else {
2577 *array = sample->read.one.id;
2578 array++;
2579 }
2580 }
2581
2582 if (type & PERF_SAMPLE_CALLCHAIN) {
2583 sz = (sample->callchain->nr + 1) * sizeof(u64);
2584 memcpy(array, sample->callchain, sz);
2585 array = (void *)array + sz;
2586 }
2587
2588 if (type & PERF_SAMPLE_RAW) {
2589 u.val32[0] = sample->raw_size;
2590 *array = u.val64;
2591 array = (void *)array + sizeof(u32);
2592
2593 memcpy(array, sample->raw_data, sample->raw_size);
2594 array = (void *)array + sample->raw_size;
2595 }
2596
2597 if (type & PERF_SAMPLE_BRANCH_STACK) {
2598 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2599 sz += sizeof(u64);
2600 memcpy(array, sample->branch_stack, sz);
2601 array = (void *)array + sz;
2602 }
2603
2604 if (type & PERF_SAMPLE_REGS_USER) {
2605 if (sample->user_regs.abi) {
2606 *array++ = sample->user_regs.abi;
2607 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2608 memcpy(array, sample->user_regs.regs, sz);
2609 array = (void *)array + sz;
2610 } else {
2611 *array++ = 0;
2612 }
2613 }
2614
2615 if (type & PERF_SAMPLE_STACK_USER) {
2616 sz = sample->user_stack.size;
2617 *array++ = sz;
2618 if (sz) {
2619 memcpy(array, sample->user_stack.data, sz);
2620 array = (void *)array + sz;
2621 *array++ = sz;
2622 }
2623 }
2624
2625 if (type & PERF_SAMPLE_WEIGHT) {
2626 *array = sample->weight;
2627 array++;
2628 }
2629
2630 if (type & PERF_SAMPLE_DATA_SRC) {
2631 *array = sample->data_src;
2632 array++;
2633 }
2634
2635 if (type & PERF_SAMPLE_TRANSACTION) {
2636 *array = sample->transaction;
2637 array++;
2638 }
2639
2640 if (type & PERF_SAMPLE_REGS_INTR) {
2641 if (sample->intr_regs.abi) {
2642 *array++ = sample->intr_regs.abi;
2643 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2644 memcpy(array, sample->intr_regs.regs, sz);
2645 array = (void *)array + sz;
2646 } else {
2647 *array++ = 0;
2648 }
2649 }
2650
2651 if (type & PERF_SAMPLE_PHYS_ADDR) {
2652 *array = sample->phys_addr;
2653 array++;
2654 }
2655
2656 return 0;
2657 }
2658
2659 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2660 {
2661 return pevent_find_field(evsel->tp_format, name);
2662 }
2663
2664 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2665 const char *name)
2666 {
2667 struct format_field *field = perf_evsel__field(evsel, name);
2668 int offset;
2669
2670 if (!field)
2671 return NULL;
2672
2673 offset = field->offset;
2674
2675 if (field->flags & FIELD_IS_DYNAMIC) {
2676 offset = *(int *)(sample->raw_data + field->offset);
2677 offset &= 0xffff;
2678 }
2679
2680 return sample->raw_data + offset;
2681 }
2682
2683 u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
2684 bool needs_swap)
2685 {
2686 u64 value;
2687 void *ptr = sample->raw_data + field->offset;
2688
2689 switch (field->size) {
2690 case 1:
2691 return *(u8 *)ptr;
2692 case 2:
2693 value = *(u16 *)ptr;
2694 break;
2695 case 4:
2696 value = *(u32 *)ptr;
2697 break;
2698 case 8:
2699 memcpy(&value, ptr, sizeof(u64));
2700 break;
2701 default:
2702 return 0;
2703 }
2704
2705 if (!needs_swap)
2706 return value;
2707
2708 switch (field->size) {
2709 case 2:
2710 return bswap_16(value);
2711 case 4:
2712 return bswap_32(value);
2713 case 8:
2714 return bswap_64(value);
2715 default:
2716 return 0;
2717 }
2718
2719 return 0;
2720 }
2721
2722 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2723 const char *name)
2724 {
2725 struct format_field *field = perf_evsel__field(evsel, name);
2726
2727 if (!field)
2728 return 0;
2729
2730 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2731 }
2732
2733 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2734 char *msg, size_t msgsize)
2735 {
2736 int paranoid;
2737
2738 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2739 evsel->attr.type == PERF_TYPE_HARDWARE &&
2740 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2741 /*
2742 * If it's cycles then fall back to hrtimer based
2743 * cpu-clock-tick sw counter, which is always available even if
2744 * no PMU support.
2745 *
2746 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2747 * b0a873e).
2748 */
2749 scnprintf(msg, msgsize, "%s",
2750 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2751
2752 evsel->attr.type = PERF_TYPE_SOFTWARE;
2753 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2754
2755 zfree(&evsel->name);
2756 return true;
2757 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2758 (paranoid = perf_event_paranoid()) > 1) {
2759 const char *name = perf_evsel__name(evsel);
2760 char *new_name;
2761 const char *sep = ":";
2762
2763 /* Is there already the separator in the name. */
2764 if (strchr(name, '/') ||
2765 strchr(name, ':'))
2766 sep = "";
2767
2768 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2769 return false;
2770
2771 if (evsel->name)
2772 free(evsel->name);
2773 evsel->name = new_name;
2774 scnprintf(msg, msgsize,
2775 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2776 evsel->attr.exclude_kernel = 1;
2777
2778 return true;
2779 }
2780
2781 return false;
2782 }
2783
2784 static bool find_process(const char *name)
2785 {
2786 size_t len = strlen(name);
2787 DIR *dir;
2788 struct dirent *d;
2789 int ret = -1;
2790
2791 dir = opendir(procfs__mountpoint());
2792 if (!dir)
2793 return false;
2794
2795 /* Walk through the directory. */
2796 while (ret && (d = readdir(dir)) != NULL) {
2797 char path[PATH_MAX];
2798 char *data;
2799 size_t size;
2800
2801 if ((d->d_type != DT_DIR) ||
2802 !strcmp(".", d->d_name) ||
2803 !strcmp("..", d->d_name))
2804 continue;
2805
2806 scnprintf(path, sizeof(path), "%s/%s/comm",
2807 procfs__mountpoint(), d->d_name);
2808
2809 if (filename__read_str(path, &data, &size))
2810 continue;
2811
2812 ret = strncmp(name, data, len);
2813 free(data);
2814 }
2815
2816 closedir(dir);
2817 return ret ? false : true;
2818 }
2819
2820 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2821 int err, char *msg, size_t size)
2822 {
2823 char sbuf[STRERR_BUFSIZE];
2824 int printed = 0;
2825
2826 switch (err) {
2827 case EPERM:
2828 case EACCES:
2829 if (err == EPERM)
2830 printed = scnprintf(msg, size,
2831 "No permission to enable %s event.\n\n",
2832 perf_evsel__name(evsel));
2833
2834 return scnprintf(msg + printed, size - printed,
2835 "You may not have permission to collect %sstats.\n\n"
2836 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2837 "which controls use of the performance events system by\n"
2838 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2839 "The current value is %d:\n\n"
2840 " -1: Allow use of (almost) all events by all users\n"
2841 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2842 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2843 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2844 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2845 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2846 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2847 " kernel.perf_event_paranoid = -1\n" ,
2848 target->system_wide ? "system-wide " : "",
2849 perf_event_paranoid());
2850 case ENOENT:
2851 return scnprintf(msg, size, "The %s event is not supported.",
2852 perf_evsel__name(evsel));
2853 case EMFILE:
2854 return scnprintf(msg, size, "%s",
2855 "Too many events are opened.\n"
2856 "Probably the maximum number of open file descriptors has been reached.\n"
2857 "Hint: Try again after reducing the number of events.\n"
2858 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2859 case ENOMEM:
2860 if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
2861 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2862 return scnprintf(msg, size,
2863 "Not enough memory to setup event with callchain.\n"
2864 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2865 "Hint: Current value: %d", sysctl__max_stack());
2866 break;
2867 case ENODEV:
2868 if (target->cpu_list)
2869 return scnprintf(msg, size, "%s",
2870 "No such device - did you specify an out-of-range profile CPU?");
2871 break;
2872 case EOPNOTSUPP:
2873 if (evsel->attr.sample_period != 0)
2874 return scnprintf(msg, size,
2875 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2876 perf_evsel__name(evsel));
2877 if (evsel->attr.precise_ip)
2878 return scnprintf(msg, size, "%s",
2879 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2880 #if defined(__i386__) || defined(__x86_64__)
2881 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2882 return scnprintf(msg, size, "%s",
2883 "No hardware sampling interrupt available.\n");
2884 #endif
2885 break;
2886 case EBUSY:
2887 if (find_process("oprofiled"))
2888 return scnprintf(msg, size,
2889 "The PMU counters are busy/taken by another profiler.\n"
2890 "We found oprofile daemon running, please stop it and try again.");
2891 break;
2892 case EINVAL:
2893 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2894 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2895 if (perf_missing_features.clockid)
2896 return scnprintf(msg, size, "clockid feature not supported.");
2897 if (perf_missing_features.clockid_wrong)
2898 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2899 break;
2900 default:
2901 break;
2902 }
2903
2904 return scnprintf(msg, size,
2905 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2906 "/bin/dmesg | grep -i perf may provide additional information.\n",
2907 err, str_error_r(err, sbuf, sizeof(sbuf)),
2908 perf_evsel__name(evsel));
2909 }
2910
2911 struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
2912 {
2913 if (evsel && evsel->evlist)
2914 return evsel->evlist->env;
2915 return NULL;
2916 }
Linux with added FPC-III support