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[mirror_ubuntu-artful-kernel.git] / tools / perf / util / evsel.c
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 <linux/bitops.h>
12 #include <api/fs/debugfs.h>
13 #include <traceevent/event-parse.h>
14 #include <linux/hw_breakpoint.h>
15 #include <linux/perf_event.h>
16 #include <sys/resource.h>
17 #include "asm/bug.h"
18 #include "callchain.h"
19 #include "cgroup.h"
20 #include "evsel.h"
21 #include "evlist.h"
22 #include "util.h"
23 #include "cpumap.h"
24 #include "thread_map.h"
25 #include "target.h"
26 #include "perf_regs.h"
27 #include "debug.h"
28 #include "trace-event.h"
29
30 static struct {
31 bool sample_id_all;
32 bool exclude_guest;
33 bool mmap2;
34 bool cloexec;
35 } perf_missing_features;
36
37 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
38 {
39 return 0;
40 }
41
42 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
43 {
44 }
45
46 static struct {
47 size_t size;
48 int (*init)(struct perf_evsel *evsel);
49 void (*fini)(struct perf_evsel *evsel);
50 } perf_evsel__object = {
51 .size = sizeof(struct perf_evsel),
52 .init = perf_evsel__no_extra_init,
53 .fini = perf_evsel__no_extra_fini,
54 };
55
56 int perf_evsel__object_config(size_t object_size,
57 int (*init)(struct perf_evsel *evsel),
58 void (*fini)(struct perf_evsel *evsel))
59 {
60
61 if (object_size == 0)
62 goto set_methods;
63
64 if (perf_evsel__object.size > object_size)
65 return -EINVAL;
66
67 perf_evsel__object.size = object_size;
68
69 set_methods:
70 if (init != NULL)
71 perf_evsel__object.init = init;
72
73 if (fini != NULL)
74 perf_evsel__object.fini = fini;
75
76 return 0;
77 }
78
79 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
80
81 int __perf_evsel__sample_size(u64 sample_type)
82 {
83 u64 mask = sample_type & PERF_SAMPLE_MASK;
84 int size = 0;
85 int i;
86
87 for (i = 0; i < 64; i++) {
88 if (mask & (1ULL << i))
89 size++;
90 }
91
92 size *= sizeof(u64);
93
94 return size;
95 }
96
97 /**
98 * __perf_evsel__calc_id_pos - calculate id_pos.
99 * @sample_type: sample type
100 *
101 * This function returns the position of the event id (PERF_SAMPLE_ID or
102 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
103 * sample_event.
104 */
105 static int __perf_evsel__calc_id_pos(u64 sample_type)
106 {
107 int idx = 0;
108
109 if (sample_type & PERF_SAMPLE_IDENTIFIER)
110 return 0;
111
112 if (!(sample_type & PERF_SAMPLE_ID))
113 return -1;
114
115 if (sample_type & PERF_SAMPLE_IP)
116 idx += 1;
117
118 if (sample_type & PERF_SAMPLE_TID)
119 idx += 1;
120
121 if (sample_type & PERF_SAMPLE_TIME)
122 idx += 1;
123
124 if (sample_type & PERF_SAMPLE_ADDR)
125 idx += 1;
126
127 return idx;
128 }
129
130 /**
131 * __perf_evsel__calc_is_pos - calculate is_pos.
132 * @sample_type: sample type
133 *
134 * This function returns the position (counting backwards) of the event id
135 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
136 * sample_id_all is used there is an id sample appended to non-sample events.
137 */
138 static int __perf_evsel__calc_is_pos(u64 sample_type)
139 {
140 int idx = 1;
141
142 if (sample_type & PERF_SAMPLE_IDENTIFIER)
143 return 1;
144
145 if (!(sample_type & PERF_SAMPLE_ID))
146 return -1;
147
148 if (sample_type & PERF_SAMPLE_CPU)
149 idx += 1;
150
151 if (sample_type & PERF_SAMPLE_STREAM_ID)
152 idx += 1;
153
154 return idx;
155 }
156
157 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
158 {
159 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
160 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
161 }
162
163 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
164 enum perf_event_sample_format bit)
165 {
166 if (!(evsel->attr.sample_type & bit)) {
167 evsel->attr.sample_type |= bit;
168 evsel->sample_size += sizeof(u64);
169 perf_evsel__calc_id_pos(evsel);
170 }
171 }
172
173 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
174 enum perf_event_sample_format bit)
175 {
176 if (evsel->attr.sample_type & bit) {
177 evsel->attr.sample_type &= ~bit;
178 evsel->sample_size -= sizeof(u64);
179 perf_evsel__calc_id_pos(evsel);
180 }
181 }
182
183 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
184 bool can_sample_identifier)
185 {
186 if (can_sample_identifier) {
187 perf_evsel__reset_sample_bit(evsel, ID);
188 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
189 } else {
190 perf_evsel__set_sample_bit(evsel, ID);
191 }
192 evsel->attr.read_format |= PERF_FORMAT_ID;
193 }
194
195 void perf_evsel__init(struct perf_evsel *evsel,
196 struct perf_event_attr *attr, int idx)
197 {
198 evsel->idx = idx;
199 evsel->tracking = !idx;
200 evsel->attr = *attr;
201 evsel->leader = evsel;
202 evsel->unit = "";
203 evsel->scale = 1.0;
204 INIT_LIST_HEAD(&evsel->node);
205 perf_evsel__object.init(evsel);
206 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
207 perf_evsel__calc_id_pos(evsel);
208 }
209
210 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
211 {
212 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
213
214 if (evsel != NULL)
215 perf_evsel__init(evsel, attr, idx);
216
217 return evsel;
218 }
219
220 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
221 {
222 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
223
224 if (evsel != NULL) {
225 struct perf_event_attr attr = {
226 .type = PERF_TYPE_TRACEPOINT,
227 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
228 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
229 };
230
231 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
232 goto out_free;
233
234 evsel->tp_format = trace_event__tp_format(sys, name);
235 if (evsel->tp_format == NULL)
236 goto out_free;
237
238 event_attr_init(&attr);
239 attr.config = evsel->tp_format->id;
240 attr.sample_period = 1;
241 perf_evsel__init(evsel, &attr, idx);
242 }
243
244 return evsel;
245
246 out_free:
247 zfree(&evsel->name);
248 free(evsel);
249 return NULL;
250 }
251
252 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
253 "cycles",
254 "instructions",
255 "cache-references",
256 "cache-misses",
257 "branches",
258 "branch-misses",
259 "bus-cycles",
260 "stalled-cycles-frontend",
261 "stalled-cycles-backend",
262 "ref-cycles",
263 };
264
265 static const char *__perf_evsel__hw_name(u64 config)
266 {
267 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
268 return perf_evsel__hw_names[config];
269
270 return "unknown-hardware";
271 }
272
273 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
274 {
275 int colon = 0, r = 0;
276 struct perf_event_attr *attr = &evsel->attr;
277 bool exclude_guest_default = false;
278
279 #define MOD_PRINT(context, mod) do { \
280 if (!attr->exclude_##context) { \
281 if (!colon) colon = ++r; \
282 r += scnprintf(bf + r, size - r, "%c", mod); \
283 } } while(0)
284
285 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
286 MOD_PRINT(kernel, 'k');
287 MOD_PRINT(user, 'u');
288 MOD_PRINT(hv, 'h');
289 exclude_guest_default = true;
290 }
291
292 if (attr->precise_ip) {
293 if (!colon)
294 colon = ++r;
295 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
296 exclude_guest_default = true;
297 }
298
299 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
300 MOD_PRINT(host, 'H');
301 MOD_PRINT(guest, 'G');
302 }
303 #undef MOD_PRINT
304 if (colon)
305 bf[colon - 1] = ':';
306 return r;
307 }
308
309 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
310 {
311 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
312 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
313 }
314
315 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
316 "cpu-clock",
317 "task-clock",
318 "page-faults",
319 "context-switches",
320 "cpu-migrations",
321 "minor-faults",
322 "major-faults",
323 "alignment-faults",
324 "emulation-faults",
325 "dummy",
326 };
327
328 static const char *__perf_evsel__sw_name(u64 config)
329 {
330 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
331 return perf_evsel__sw_names[config];
332 return "unknown-software";
333 }
334
335 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
336 {
337 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
338 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
339 }
340
341 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
342 {
343 int r;
344
345 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
346
347 if (type & HW_BREAKPOINT_R)
348 r += scnprintf(bf + r, size - r, "r");
349
350 if (type & HW_BREAKPOINT_W)
351 r += scnprintf(bf + r, size - r, "w");
352
353 if (type & HW_BREAKPOINT_X)
354 r += scnprintf(bf + r, size - r, "x");
355
356 return r;
357 }
358
359 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
360 {
361 struct perf_event_attr *attr = &evsel->attr;
362 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
363 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
364 }
365
366 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
367 [PERF_EVSEL__MAX_ALIASES] = {
368 { "L1-dcache", "l1-d", "l1d", "L1-data", },
369 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
370 { "LLC", "L2", },
371 { "dTLB", "d-tlb", "Data-TLB", },
372 { "iTLB", "i-tlb", "Instruction-TLB", },
373 { "branch", "branches", "bpu", "btb", "bpc", },
374 { "node", },
375 };
376
377 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
378 [PERF_EVSEL__MAX_ALIASES] = {
379 { "load", "loads", "read", },
380 { "store", "stores", "write", },
381 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
382 };
383
384 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
385 [PERF_EVSEL__MAX_ALIASES] = {
386 { "refs", "Reference", "ops", "access", },
387 { "misses", "miss", },
388 };
389
390 #define C(x) PERF_COUNT_HW_CACHE_##x
391 #define CACHE_READ (1 << C(OP_READ))
392 #define CACHE_WRITE (1 << C(OP_WRITE))
393 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
394 #define COP(x) (1 << x)
395
396 /*
397 * cache operartion stat
398 * L1I : Read and prefetch only
399 * ITLB and BPU : Read-only
400 */
401 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
402 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
403 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
404 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
405 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
406 [C(ITLB)] = (CACHE_READ),
407 [C(BPU)] = (CACHE_READ),
408 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
409 };
410
411 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
412 {
413 if (perf_evsel__hw_cache_stat[type] & COP(op))
414 return true; /* valid */
415 else
416 return false; /* invalid */
417 }
418
419 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
420 char *bf, size_t size)
421 {
422 if (result) {
423 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
424 perf_evsel__hw_cache_op[op][0],
425 perf_evsel__hw_cache_result[result][0]);
426 }
427
428 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
429 perf_evsel__hw_cache_op[op][1]);
430 }
431
432 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
433 {
434 u8 op, result, type = (config >> 0) & 0xff;
435 const char *err = "unknown-ext-hardware-cache-type";
436
437 if (type > PERF_COUNT_HW_CACHE_MAX)
438 goto out_err;
439
440 op = (config >> 8) & 0xff;
441 err = "unknown-ext-hardware-cache-op";
442 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
443 goto out_err;
444
445 result = (config >> 16) & 0xff;
446 err = "unknown-ext-hardware-cache-result";
447 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
448 goto out_err;
449
450 err = "invalid-cache";
451 if (!perf_evsel__is_cache_op_valid(type, op))
452 goto out_err;
453
454 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
455 out_err:
456 return scnprintf(bf, size, "%s", err);
457 }
458
459 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
460 {
461 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
462 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
463 }
464
465 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
466 {
467 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
468 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
469 }
470
471 const char *perf_evsel__name(struct perf_evsel *evsel)
472 {
473 char bf[128];
474
475 if (evsel->name)
476 return evsel->name;
477
478 switch (evsel->attr.type) {
479 case PERF_TYPE_RAW:
480 perf_evsel__raw_name(evsel, bf, sizeof(bf));
481 break;
482
483 case PERF_TYPE_HARDWARE:
484 perf_evsel__hw_name(evsel, bf, sizeof(bf));
485 break;
486
487 case PERF_TYPE_HW_CACHE:
488 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
489 break;
490
491 case PERF_TYPE_SOFTWARE:
492 perf_evsel__sw_name(evsel, bf, sizeof(bf));
493 break;
494
495 case PERF_TYPE_TRACEPOINT:
496 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
497 break;
498
499 case PERF_TYPE_BREAKPOINT:
500 perf_evsel__bp_name(evsel, bf, sizeof(bf));
501 break;
502
503 default:
504 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
505 evsel->attr.type);
506 break;
507 }
508
509 evsel->name = strdup(bf);
510
511 return evsel->name ?: "unknown";
512 }
513
514 const char *perf_evsel__group_name(struct perf_evsel *evsel)
515 {
516 return evsel->group_name ?: "anon group";
517 }
518
519 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
520 {
521 int ret;
522 struct perf_evsel *pos;
523 const char *group_name = perf_evsel__group_name(evsel);
524
525 ret = scnprintf(buf, size, "%s", group_name);
526
527 ret += scnprintf(buf + ret, size - ret, " { %s",
528 perf_evsel__name(evsel));
529
530 for_each_group_member(pos, evsel)
531 ret += scnprintf(buf + ret, size - ret, ", %s",
532 perf_evsel__name(pos));
533
534 ret += scnprintf(buf + ret, size - ret, " }");
535
536 return ret;
537 }
538
539 static void
540 perf_evsel__config_callgraph(struct perf_evsel *evsel,
541 struct record_opts *opts)
542 {
543 bool function = perf_evsel__is_function_event(evsel);
544 struct perf_event_attr *attr = &evsel->attr;
545
546 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
547
548 if (callchain_param.record_mode == CALLCHAIN_LBR) {
549 if (!opts->branch_stack) {
550 if (attr->exclude_user) {
551 pr_warning("LBR callstack option is only available "
552 "to get user callchain information. "
553 "Falling back to framepointers.\n");
554 } else {
555 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
556 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
557 PERF_SAMPLE_BRANCH_CALL_STACK;
558 }
559 } else
560 pr_warning("Cannot use LBR callstack with branch stack. "
561 "Falling back to framepointers.\n");
562 }
563
564 if (callchain_param.record_mode == CALLCHAIN_DWARF) {
565 if (!function) {
566 perf_evsel__set_sample_bit(evsel, REGS_USER);
567 perf_evsel__set_sample_bit(evsel, STACK_USER);
568 attr->sample_regs_user = PERF_REGS_MASK;
569 attr->sample_stack_user = callchain_param.dump_size;
570 attr->exclude_callchain_user = 1;
571 } else {
572 pr_info("Cannot use DWARF unwind for function trace event,"
573 " falling back to framepointers.\n");
574 }
575 }
576
577 if (function) {
578 pr_info("Disabling user space callchains for function trace event.\n");
579 attr->exclude_callchain_user = 1;
580 }
581 }
582
583 /*
584 * The enable_on_exec/disabled value strategy:
585 *
586 * 1) For any type of traced program:
587 * - all independent events and group leaders are disabled
588 * - all group members are enabled
589 *
590 * Group members are ruled by group leaders. They need to
591 * be enabled, because the group scheduling relies on that.
592 *
593 * 2) For traced programs executed by perf:
594 * - all independent events and group leaders have
595 * enable_on_exec set
596 * - we don't specifically enable or disable any event during
597 * the record command
598 *
599 * Independent events and group leaders are initially disabled
600 * and get enabled by exec. Group members are ruled by group
601 * leaders as stated in 1).
602 *
603 * 3) For traced programs attached by perf (pid/tid):
604 * - we specifically enable or disable all events during
605 * the record command
606 *
607 * When attaching events to already running traced we
608 * enable/disable events specifically, as there's no
609 * initial traced exec call.
610 */
611 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
612 {
613 struct perf_evsel *leader = evsel->leader;
614 struct perf_event_attr *attr = &evsel->attr;
615 int track = evsel->tracking;
616 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
617
618 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
619 attr->inherit = !opts->no_inherit;
620
621 perf_evsel__set_sample_bit(evsel, IP);
622 perf_evsel__set_sample_bit(evsel, TID);
623
624 if (evsel->sample_read) {
625 perf_evsel__set_sample_bit(evsel, READ);
626
627 /*
628 * We need ID even in case of single event, because
629 * PERF_SAMPLE_READ process ID specific data.
630 */
631 perf_evsel__set_sample_id(evsel, false);
632
633 /*
634 * Apply group format only if we belong to group
635 * with more than one members.
636 */
637 if (leader->nr_members > 1) {
638 attr->read_format |= PERF_FORMAT_GROUP;
639 attr->inherit = 0;
640 }
641 }
642
643 /*
644 * We default some events to have a default interval. But keep
645 * it a weak assumption overridable by the user.
646 */
647 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
648 opts->user_interval != ULLONG_MAX)) {
649 if (opts->freq) {
650 perf_evsel__set_sample_bit(evsel, PERIOD);
651 attr->freq = 1;
652 attr->sample_freq = opts->freq;
653 } else {
654 attr->sample_period = opts->default_interval;
655 }
656 }
657
658 /*
659 * Disable sampling for all group members other
660 * than leader in case leader 'leads' the sampling.
661 */
662 if ((leader != evsel) && leader->sample_read) {
663 attr->sample_freq = 0;
664 attr->sample_period = 0;
665 }
666
667 if (opts->no_samples)
668 attr->sample_freq = 0;
669
670 if (opts->inherit_stat)
671 attr->inherit_stat = 1;
672
673 if (opts->sample_address) {
674 perf_evsel__set_sample_bit(evsel, ADDR);
675 attr->mmap_data = track;
676 }
677
678 /*
679 * We don't allow user space callchains for function trace
680 * event, due to issues with page faults while tracing page
681 * fault handler and its overall trickiness nature.
682 */
683 if (perf_evsel__is_function_event(evsel))
684 evsel->attr.exclude_callchain_user = 1;
685
686 if (callchain_param.enabled && !evsel->no_aux_samples)
687 perf_evsel__config_callgraph(evsel, opts);
688
689 if (opts->sample_intr_regs) {
690 attr->sample_regs_intr = PERF_REGS_MASK;
691 perf_evsel__set_sample_bit(evsel, REGS_INTR);
692 }
693
694 if (target__has_cpu(&opts->target))
695 perf_evsel__set_sample_bit(evsel, CPU);
696
697 if (opts->period)
698 perf_evsel__set_sample_bit(evsel, PERIOD);
699
700 /*
701 * When the user explicitely disabled time don't force it here.
702 */
703 if (opts->sample_time &&
704 (!perf_missing_features.sample_id_all &&
705 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu)))
706 perf_evsel__set_sample_bit(evsel, TIME);
707
708 if (opts->raw_samples && !evsel->no_aux_samples) {
709 perf_evsel__set_sample_bit(evsel, TIME);
710 perf_evsel__set_sample_bit(evsel, RAW);
711 perf_evsel__set_sample_bit(evsel, CPU);
712 }
713
714 if (opts->sample_address)
715 perf_evsel__set_sample_bit(evsel, DATA_SRC);
716
717 if (opts->no_buffering) {
718 attr->watermark = 0;
719 attr->wakeup_events = 1;
720 }
721 if (opts->branch_stack && !evsel->no_aux_samples) {
722 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
723 attr->branch_sample_type = opts->branch_stack;
724 }
725
726 if (opts->sample_weight)
727 perf_evsel__set_sample_bit(evsel, WEIGHT);
728
729 attr->task = track;
730 attr->mmap = track;
731 attr->mmap2 = track && !perf_missing_features.mmap2;
732 attr->comm = track;
733
734 if (opts->sample_transaction)
735 perf_evsel__set_sample_bit(evsel, TRANSACTION);
736
737 if (opts->running_time) {
738 evsel->attr.read_format |=
739 PERF_FORMAT_TOTAL_TIME_ENABLED |
740 PERF_FORMAT_TOTAL_TIME_RUNNING;
741 }
742
743 /*
744 * XXX see the function comment above
745 *
746 * Disabling only independent events or group leaders,
747 * keeping group members enabled.
748 */
749 if (perf_evsel__is_group_leader(evsel))
750 attr->disabled = 1;
751
752 /*
753 * Setting enable_on_exec for independent events and
754 * group leaders for traced executed by perf.
755 */
756 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
757 !opts->initial_delay)
758 attr->enable_on_exec = 1;
759
760 if (evsel->immediate) {
761 attr->disabled = 0;
762 attr->enable_on_exec = 0;
763 }
764 }
765
766 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
767 {
768 int cpu, thread;
769
770 if (evsel->system_wide)
771 nthreads = 1;
772
773 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
774
775 if (evsel->fd) {
776 for (cpu = 0; cpu < ncpus; cpu++) {
777 for (thread = 0; thread < nthreads; thread++) {
778 FD(evsel, cpu, thread) = -1;
779 }
780 }
781 }
782
783 return evsel->fd != NULL ? 0 : -ENOMEM;
784 }
785
786 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
787 int ioc, void *arg)
788 {
789 int cpu, thread;
790
791 if (evsel->system_wide)
792 nthreads = 1;
793
794 for (cpu = 0; cpu < ncpus; cpu++) {
795 for (thread = 0; thread < nthreads; thread++) {
796 int fd = FD(evsel, cpu, thread),
797 err = ioctl(fd, ioc, arg);
798
799 if (err)
800 return err;
801 }
802 }
803
804 return 0;
805 }
806
807 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
808 const char *filter)
809 {
810 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
811 PERF_EVENT_IOC_SET_FILTER,
812 (void *)filter);
813 }
814
815 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
816 {
817 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
818 PERF_EVENT_IOC_ENABLE,
819 0);
820 }
821
822 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
823 {
824 if (ncpus == 0 || nthreads == 0)
825 return 0;
826
827 if (evsel->system_wide)
828 nthreads = 1;
829
830 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
831 if (evsel->sample_id == NULL)
832 return -ENOMEM;
833
834 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
835 if (evsel->id == NULL) {
836 xyarray__delete(evsel->sample_id);
837 evsel->sample_id = NULL;
838 return -ENOMEM;
839 }
840
841 return 0;
842 }
843
844 void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
845 {
846 memset(evsel->counts, 0, (sizeof(*evsel->counts) +
847 (ncpus * sizeof(struct perf_counts_values))));
848 }
849
850 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
851 {
852 evsel->counts = zalloc((sizeof(*evsel->counts) +
853 (ncpus * sizeof(struct perf_counts_values))));
854 return evsel->counts != NULL ? 0 : -ENOMEM;
855 }
856
857 static void perf_evsel__free_fd(struct perf_evsel *evsel)
858 {
859 xyarray__delete(evsel->fd);
860 evsel->fd = NULL;
861 }
862
863 static void perf_evsel__free_id(struct perf_evsel *evsel)
864 {
865 xyarray__delete(evsel->sample_id);
866 evsel->sample_id = NULL;
867 zfree(&evsel->id);
868 }
869
870 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
871 {
872 int cpu, thread;
873
874 if (evsel->system_wide)
875 nthreads = 1;
876
877 for (cpu = 0; cpu < ncpus; cpu++)
878 for (thread = 0; thread < nthreads; ++thread) {
879 close(FD(evsel, cpu, thread));
880 FD(evsel, cpu, thread) = -1;
881 }
882 }
883
884 void perf_evsel__free_counts(struct perf_evsel *evsel)
885 {
886 zfree(&evsel->counts);
887 }
888
889 void perf_evsel__exit(struct perf_evsel *evsel)
890 {
891 assert(list_empty(&evsel->node));
892 perf_evsel__free_fd(evsel);
893 perf_evsel__free_id(evsel);
894 close_cgroup(evsel->cgrp);
895 zfree(&evsel->group_name);
896 zfree(&evsel->name);
897 perf_evsel__object.fini(evsel);
898 }
899
900 void perf_evsel__delete(struct perf_evsel *evsel)
901 {
902 perf_evsel__exit(evsel);
903 free(evsel);
904 }
905
906 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu,
907 struct perf_counts_values *count)
908 {
909 struct perf_counts_values tmp;
910
911 if (!evsel->prev_raw_counts)
912 return;
913
914 if (cpu == -1) {
915 tmp = evsel->prev_raw_counts->aggr;
916 evsel->prev_raw_counts->aggr = *count;
917 } else {
918 tmp = evsel->prev_raw_counts->cpu[cpu];
919 evsel->prev_raw_counts->cpu[cpu] = *count;
920 }
921
922 count->val = count->val - tmp.val;
923 count->ena = count->ena - tmp.ena;
924 count->run = count->run - tmp.run;
925 }
926
927 void perf_counts_values__scale(struct perf_counts_values *count,
928 bool scale, s8 *pscaled)
929 {
930 s8 scaled = 0;
931
932 if (scale) {
933 if (count->run == 0) {
934 scaled = -1;
935 count->val = 0;
936 } else if (count->run < count->ena) {
937 scaled = 1;
938 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
939 }
940 } else
941 count->ena = count->run = 0;
942
943 if (pscaled)
944 *pscaled = scaled;
945 }
946
947 int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
948 perf_evsel__read_cb_t cb)
949 {
950 struct perf_counts_values count;
951
952 memset(&count, 0, sizeof(count));
953
954 if (FD(evsel, cpu, thread) < 0)
955 return -EINVAL;
956
957 if (readn(FD(evsel, cpu, thread), &count, sizeof(count)) < 0)
958 return -errno;
959
960 return cb(evsel, cpu, thread, &count);
961 }
962
963 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
964 int cpu, int thread, bool scale)
965 {
966 struct perf_counts_values count;
967 size_t nv = scale ? 3 : 1;
968
969 if (FD(evsel, cpu, thread) < 0)
970 return -EINVAL;
971
972 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
973 return -ENOMEM;
974
975 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
976 return -errno;
977
978 perf_evsel__compute_deltas(evsel, cpu, &count);
979 perf_counts_values__scale(&count, scale, NULL);
980 evsel->counts->cpu[cpu] = count;
981 return 0;
982 }
983
984 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
985 {
986 struct perf_evsel *leader = evsel->leader;
987 int fd;
988
989 if (perf_evsel__is_group_leader(evsel))
990 return -1;
991
992 /*
993 * Leader must be already processed/open,
994 * if not it's a bug.
995 */
996 BUG_ON(!leader->fd);
997
998 fd = FD(leader, cpu, thread);
999 BUG_ON(fd == -1);
1000
1001 return fd;
1002 }
1003
1004 #define __PRINT_ATTR(fmt, cast, field) \
1005 fprintf(fp, " %-19s "fmt"\n", #field, cast attr->field)
1006
1007 #define PRINT_ATTR_U32(field) __PRINT_ATTR("%u" , , field)
1008 #define PRINT_ATTR_X32(field) __PRINT_ATTR("%#x", , field)
1009 #define PRINT_ATTR_U64(field) __PRINT_ATTR("%" PRIu64, (uint64_t), field)
1010 #define PRINT_ATTR_X64(field) __PRINT_ATTR("%#"PRIx64, (uint64_t), field)
1011
1012 #define PRINT_ATTR2N(name1, field1, name2, field2) \
1013 fprintf(fp, " %-19s %u %-19s %u\n", \
1014 name1, attr->field1, name2, attr->field2)
1015
1016 #define PRINT_ATTR2(field1, field2) \
1017 PRINT_ATTR2N(#field1, field1, #field2, field2)
1018
1019 static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
1020 {
1021 size_t ret = 0;
1022
1023 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
1024 ret += fprintf(fp, "perf_event_attr:\n");
1025
1026 ret += PRINT_ATTR_U32(type);
1027 ret += PRINT_ATTR_U32(size);
1028 ret += PRINT_ATTR_X64(config);
1029 ret += PRINT_ATTR_U64(sample_period);
1030 ret += PRINT_ATTR_U64(sample_freq);
1031 ret += PRINT_ATTR_X64(sample_type);
1032 ret += PRINT_ATTR_X64(read_format);
1033
1034 ret += PRINT_ATTR2(disabled, inherit);
1035 ret += PRINT_ATTR2(pinned, exclusive);
1036 ret += PRINT_ATTR2(exclude_user, exclude_kernel);
1037 ret += PRINT_ATTR2(exclude_hv, exclude_idle);
1038 ret += PRINT_ATTR2(mmap, comm);
1039 ret += PRINT_ATTR2(mmap2, comm_exec);
1040 ret += PRINT_ATTR2(freq, inherit_stat);
1041 ret += PRINT_ATTR2(enable_on_exec, task);
1042 ret += PRINT_ATTR2(watermark, precise_ip);
1043 ret += PRINT_ATTR2(mmap_data, sample_id_all);
1044 ret += PRINT_ATTR2(exclude_host, exclude_guest);
1045 ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel,
1046 "excl.callchain_user", exclude_callchain_user);
1047
1048 ret += PRINT_ATTR_U32(wakeup_events);
1049 ret += PRINT_ATTR_U32(wakeup_watermark);
1050 ret += PRINT_ATTR_X32(bp_type);
1051 ret += PRINT_ATTR_X64(bp_addr);
1052 ret += PRINT_ATTR_X64(config1);
1053 ret += PRINT_ATTR_U64(bp_len);
1054 ret += PRINT_ATTR_X64(config2);
1055 ret += PRINT_ATTR_X64(branch_sample_type);
1056 ret += PRINT_ATTR_X64(sample_regs_user);
1057 ret += PRINT_ATTR_U32(sample_stack_user);
1058 ret += PRINT_ATTR_X64(sample_regs_intr);
1059
1060 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
1061
1062 return ret;
1063 }
1064
1065 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1066 struct thread_map *threads)
1067 {
1068 int cpu, thread, nthreads;
1069 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1070 int pid = -1, err;
1071 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1072
1073 if (evsel->system_wide)
1074 nthreads = 1;
1075 else
1076 nthreads = threads->nr;
1077
1078 if (evsel->fd == NULL &&
1079 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1080 return -ENOMEM;
1081
1082 if (evsel->cgrp) {
1083 flags |= PERF_FLAG_PID_CGROUP;
1084 pid = evsel->cgrp->fd;
1085 }
1086
1087 fallback_missing_features:
1088 if (perf_missing_features.cloexec)
1089 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1090 if (perf_missing_features.mmap2)
1091 evsel->attr.mmap2 = 0;
1092 if (perf_missing_features.exclude_guest)
1093 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1094 retry_sample_id:
1095 if (perf_missing_features.sample_id_all)
1096 evsel->attr.sample_id_all = 0;
1097
1098 if (verbose >= 2)
1099 perf_event_attr__fprintf(&evsel->attr, stderr);
1100
1101 for (cpu = 0; cpu < cpus->nr; cpu++) {
1102
1103 for (thread = 0; thread < nthreads; thread++) {
1104 int group_fd;
1105
1106 if (!evsel->cgrp && !evsel->system_wide)
1107 pid = threads->map[thread];
1108
1109 group_fd = get_group_fd(evsel, cpu, thread);
1110 retry_open:
1111 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1112 pid, cpus->map[cpu], group_fd, flags);
1113
1114 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1115 pid,
1116 cpus->map[cpu],
1117 group_fd, flags);
1118 if (FD(evsel, cpu, thread) < 0) {
1119 err = -errno;
1120 pr_debug2("sys_perf_event_open failed, error %d\n",
1121 err);
1122 goto try_fallback;
1123 }
1124 set_rlimit = NO_CHANGE;
1125 }
1126 }
1127
1128 return 0;
1129
1130 try_fallback:
1131 /*
1132 * perf stat needs between 5 and 22 fds per CPU. When we run out
1133 * of them try to increase the limits.
1134 */
1135 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1136 struct rlimit l;
1137 int old_errno = errno;
1138
1139 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1140 if (set_rlimit == NO_CHANGE)
1141 l.rlim_cur = l.rlim_max;
1142 else {
1143 l.rlim_cur = l.rlim_max + 1000;
1144 l.rlim_max = l.rlim_cur;
1145 }
1146 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1147 set_rlimit++;
1148 errno = old_errno;
1149 goto retry_open;
1150 }
1151 }
1152 errno = old_errno;
1153 }
1154
1155 if (err != -EINVAL || cpu > 0 || thread > 0)
1156 goto out_close;
1157
1158 if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1159 perf_missing_features.cloexec = true;
1160 goto fallback_missing_features;
1161 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1162 perf_missing_features.mmap2 = true;
1163 goto fallback_missing_features;
1164 } else if (!perf_missing_features.exclude_guest &&
1165 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1166 perf_missing_features.exclude_guest = true;
1167 goto fallback_missing_features;
1168 } else if (!perf_missing_features.sample_id_all) {
1169 perf_missing_features.sample_id_all = true;
1170 goto retry_sample_id;
1171 }
1172
1173 out_close:
1174 do {
1175 while (--thread >= 0) {
1176 close(FD(evsel, cpu, thread));
1177 FD(evsel, cpu, thread) = -1;
1178 }
1179 thread = nthreads;
1180 } while (--cpu >= 0);
1181 return err;
1182 }
1183
1184 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1185 {
1186 if (evsel->fd == NULL)
1187 return;
1188
1189 perf_evsel__close_fd(evsel, ncpus, nthreads);
1190 perf_evsel__free_fd(evsel);
1191 }
1192
1193 static struct {
1194 struct cpu_map map;
1195 int cpus[1];
1196 } empty_cpu_map = {
1197 .map.nr = 1,
1198 .cpus = { -1, },
1199 };
1200
1201 static struct {
1202 struct thread_map map;
1203 int threads[1];
1204 } empty_thread_map = {
1205 .map.nr = 1,
1206 .threads = { -1, },
1207 };
1208
1209 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1210 struct thread_map *threads)
1211 {
1212 if (cpus == NULL) {
1213 /* Work around old compiler warnings about strict aliasing */
1214 cpus = &empty_cpu_map.map;
1215 }
1216
1217 if (threads == NULL)
1218 threads = &empty_thread_map.map;
1219
1220 return __perf_evsel__open(evsel, cpus, threads);
1221 }
1222
1223 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1224 struct cpu_map *cpus)
1225 {
1226 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1227 }
1228
1229 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1230 struct thread_map *threads)
1231 {
1232 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1233 }
1234
1235 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1236 const union perf_event *event,
1237 struct perf_sample *sample)
1238 {
1239 u64 type = evsel->attr.sample_type;
1240 const u64 *array = event->sample.array;
1241 bool swapped = evsel->needs_swap;
1242 union u64_swap u;
1243
1244 array += ((event->header.size -
1245 sizeof(event->header)) / sizeof(u64)) - 1;
1246
1247 if (type & PERF_SAMPLE_IDENTIFIER) {
1248 sample->id = *array;
1249 array--;
1250 }
1251
1252 if (type & PERF_SAMPLE_CPU) {
1253 u.val64 = *array;
1254 if (swapped) {
1255 /* undo swap of u64, then swap on individual u32s */
1256 u.val64 = bswap_64(u.val64);
1257 u.val32[0] = bswap_32(u.val32[0]);
1258 }
1259
1260 sample->cpu = u.val32[0];
1261 array--;
1262 }
1263
1264 if (type & PERF_SAMPLE_STREAM_ID) {
1265 sample->stream_id = *array;
1266 array--;
1267 }
1268
1269 if (type & PERF_SAMPLE_ID) {
1270 sample->id = *array;
1271 array--;
1272 }
1273
1274 if (type & PERF_SAMPLE_TIME) {
1275 sample->time = *array;
1276 array--;
1277 }
1278
1279 if (type & PERF_SAMPLE_TID) {
1280 u.val64 = *array;
1281 if (swapped) {
1282 /* undo swap of u64, then swap on individual u32s */
1283 u.val64 = bswap_64(u.val64);
1284 u.val32[0] = bswap_32(u.val32[0]);
1285 u.val32[1] = bswap_32(u.val32[1]);
1286 }
1287
1288 sample->pid = u.val32[0];
1289 sample->tid = u.val32[1];
1290 array--;
1291 }
1292
1293 return 0;
1294 }
1295
1296 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1297 u64 size)
1298 {
1299 return size > max_size || offset + size > endp;
1300 }
1301
1302 #define OVERFLOW_CHECK(offset, size, max_size) \
1303 do { \
1304 if (overflow(endp, (max_size), (offset), (size))) \
1305 return -EFAULT; \
1306 } while (0)
1307
1308 #define OVERFLOW_CHECK_u64(offset) \
1309 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1310
1311 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1312 struct perf_sample *data)
1313 {
1314 u64 type = evsel->attr.sample_type;
1315 bool swapped = evsel->needs_swap;
1316 const u64 *array;
1317 u16 max_size = event->header.size;
1318 const void *endp = (void *)event + max_size;
1319 u64 sz;
1320
1321 /*
1322 * used for cross-endian analysis. See git commit 65014ab3
1323 * for why this goofiness is needed.
1324 */
1325 union u64_swap u;
1326
1327 memset(data, 0, sizeof(*data));
1328 data->cpu = data->pid = data->tid = -1;
1329 data->stream_id = data->id = data->time = -1ULL;
1330 data->period = evsel->attr.sample_period;
1331 data->weight = 0;
1332
1333 if (event->header.type != PERF_RECORD_SAMPLE) {
1334 if (!evsel->attr.sample_id_all)
1335 return 0;
1336 return perf_evsel__parse_id_sample(evsel, event, data);
1337 }
1338
1339 array = event->sample.array;
1340
1341 /*
1342 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1343 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1344 * check the format does not go past the end of the event.
1345 */
1346 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1347 return -EFAULT;
1348
1349 data->id = -1ULL;
1350 if (type & PERF_SAMPLE_IDENTIFIER) {
1351 data->id = *array;
1352 array++;
1353 }
1354
1355 if (type & PERF_SAMPLE_IP) {
1356 data->ip = *array;
1357 array++;
1358 }
1359
1360 if (type & PERF_SAMPLE_TID) {
1361 u.val64 = *array;
1362 if (swapped) {
1363 /* undo swap of u64, then swap on individual u32s */
1364 u.val64 = bswap_64(u.val64);
1365 u.val32[0] = bswap_32(u.val32[0]);
1366 u.val32[1] = bswap_32(u.val32[1]);
1367 }
1368
1369 data->pid = u.val32[0];
1370 data->tid = u.val32[1];
1371 array++;
1372 }
1373
1374 if (type & PERF_SAMPLE_TIME) {
1375 data->time = *array;
1376 array++;
1377 }
1378
1379 data->addr = 0;
1380 if (type & PERF_SAMPLE_ADDR) {
1381 data->addr = *array;
1382 array++;
1383 }
1384
1385 if (type & PERF_SAMPLE_ID) {
1386 data->id = *array;
1387 array++;
1388 }
1389
1390 if (type & PERF_SAMPLE_STREAM_ID) {
1391 data->stream_id = *array;
1392 array++;
1393 }
1394
1395 if (type & PERF_SAMPLE_CPU) {
1396
1397 u.val64 = *array;
1398 if (swapped) {
1399 /* undo swap of u64, then swap on individual u32s */
1400 u.val64 = bswap_64(u.val64);
1401 u.val32[0] = bswap_32(u.val32[0]);
1402 }
1403
1404 data->cpu = u.val32[0];
1405 array++;
1406 }
1407
1408 if (type & PERF_SAMPLE_PERIOD) {
1409 data->period = *array;
1410 array++;
1411 }
1412
1413 if (type & PERF_SAMPLE_READ) {
1414 u64 read_format = evsel->attr.read_format;
1415
1416 OVERFLOW_CHECK_u64(array);
1417 if (read_format & PERF_FORMAT_GROUP)
1418 data->read.group.nr = *array;
1419 else
1420 data->read.one.value = *array;
1421
1422 array++;
1423
1424 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1425 OVERFLOW_CHECK_u64(array);
1426 data->read.time_enabled = *array;
1427 array++;
1428 }
1429
1430 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1431 OVERFLOW_CHECK_u64(array);
1432 data->read.time_running = *array;
1433 array++;
1434 }
1435
1436 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1437 if (read_format & PERF_FORMAT_GROUP) {
1438 const u64 max_group_nr = UINT64_MAX /
1439 sizeof(struct sample_read_value);
1440
1441 if (data->read.group.nr > max_group_nr)
1442 return -EFAULT;
1443 sz = data->read.group.nr *
1444 sizeof(struct sample_read_value);
1445 OVERFLOW_CHECK(array, sz, max_size);
1446 data->read.group.values =
1447 (struct sample_read_value *)array;
1448 array = (void *)array + sz;
1449 } else {
1450 OVERFLOW_CHECK_u64(array);
1451 data->read.one.id = *array;
1452 array++;
1453 }
1454 }
1455
1456 if (type & PERF_SAMPLE_CALLCHAIN) {
1457 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1458
1459 OVERFLOW_CHECK_u64(array);
1460 data->callchain = (struct ip_callchain *)array++;
1461 if (data->callchain->nr > max_callchain_nr)
1462 return -EFAULT;
1463 sz = data->callchain->nr * sizeof(u64);
1464 OVERFLOW_CHECK(array, sz, max_size);
1465 array = (void *)array + sz;
1466 }
1467
1468 if (type & PERF_SAMPLE_RAW) {
1469 OVERFLOW_CHECK_u64(array);
1470 u.val64 = *array;
1471 if (WARN_ONCE(swapped,
1472 "Endianness of raw data not corrected!\n")) {
1473 /* undo swap of u64, then swap on individual u32s */
1474 u.val64 = bswap_64(u.val64);
1475 u.val32[0] = bswap_32(u.val32[0]);
1476 u.val32[1] = bswap_32(u.val32[1]);
1477 }
1478 data->raw_size = u.val32[0];
1479 array = (void *)array + sizeof(u32);
1480
1481 OVERFLOW_CHECK(array, data->raw_size, max_size);
1482 data->raw_data = (void *)array;
1483 array = (void *)array + data->raw_size;
1484 }
1485
1486 if (type & PERF_SAMPLE_BRANCH_STACK) {
1487 const u64 max_branch_nr = UINT64_MAX /
1488 sizeof(struct branch_entry);
1489
1490 OVERFLOW_CHECK_u64(array);
1491 data->branch_stack = (struct branch_stack *)array++;
1492
1493 if (data->branch_stack->nr > max_branch_nr)
1494 return -EFAULT;
1495 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1496 OVERFLOW_CHECK(array, sz, max_size);
1497 array = (void *)array + sz;
1498 }
1499
1500 if (type & PERF_SAMPLE_REGS_USER) {
1501 OVERFLOW_CHECK_u64(array);
1502 data->user_regs.abi = *array;
1503 array++;
1504
1505 if (data->user_regs.abi) {
1506 u64 mask = evsel->attr.sample_regs_user;
1507
1508 sz = hweight_long(mask) * sizeof(u64);
1509 OVERFLOW_CHECK(array, sz, max_size);
1510 data->user_regs.mask = mask;
1511 data->user_regs.regs = (u64 *)array;
1512 array = (void *)array + sz;
1513 }
1514 }
1515
1516 if (type & PERF_SAMPLE_STACK_USER) {
1517 OVERFLOW_CHECK_u64(array);
1518 sz = *array++;
1519
1520 data->user_stack.offset = ((char *)(array - 1)
1521 - (char *) event);
1522
1523 if (!sz) {
1524 data->user_stack.size = 0;
1525 } else {
1526 OVERFLOW_CHECK(array, sz, max_size);
1527 data->user_stack.data = (char *)array;
1528 array = (void *)array + sz;
1529 OVERFLOW_CHECK_u64(array);
1530 data->user_stack.size = *array++;
1531 if (WARN_ONCE(data->user_stack.size > sz,
1532 "user stack dump failure\n"))
1533 return -EFAULT;
1534 }
1535 }
1536
1537 data->weight = 0;
1538 if (type & PERF_SAMPLE_WEIGHT) {
1539 OVERFLOW_CHECK_u64(array);
1540 data->weight = *array;
1541 array++;
1542 }
1543
1544 data->data_src = PERF_MEM_DATA_SRC_NONE;
1545 if (type & PERF_SAMPLE_DATA_SRC) {
1546 OVERFLOW_CHECK_u64(array);
1547 data->data_src = *array;
1548 array++;
1549 }
1550
1551 data->transaction = 0;
1552 if (type & PERF_SAMPLE_TRANSACTION) {
1553 OVERFLOW_CHECK_u64(array);
1554 data->transaction = *array;
1555 array++;
1556 }
1557
1558 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1559 if (type & PERF_SAMPLE_REGS_INTR) {
1560 OVERFLOW_CHECK_u64(array);
1561 data->intr_regs.abi = *array;
1562 array++;
1563
1564 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1565 u64 mask = evsel->attr.sample_regs_intr;
1566
1567 sz = hweight_long(mask) * sizeof(u64);
1568 OVERFLOW_CHECK(array, sz, max_size);
1569 data->intr_regs.mask = mask;
1570 data->intr_regs.regs = (u64 *)array;
1571 array = (void *)array + sz;
1572 }
1573 }
1574
1575 return 0;
1576 }
1577
1578 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1579 u64 read_format)
1580 {
1581 size_t sz, result = sizeof(struct sample_event);
1582
1583 if (type & PERF_SAMPLE_IDENTIFIER)
1584 result += sizeof(u64);
1585
1586 if (type & PERF_SAMPLE_IP)
1587 result += sizeof(u64);
1588
1589 if (type & PERF_SAMPLE_TID)
1590 result += sizeof(u64);
1591
1592 if (type & PERF_SAMPLE_TIME)
1593 result += sizeof(u64);
1594
1595 if (type & PERF_SAMPLE_ADDR)
1596 result += sizeof(u64);
1597
1598 if (type & PERF_SAMPLE_ID)
1599 result += sizeof(u64);
1600
1601 if (type & PERF_SAMPLE_STREAM_ID)
1602 result += sizeof(u64);
1603
1604 if (type & PERF_SAMPLE_CPU)
1605 result += sizeof(u64);
1606
1607 if (type & PERF_SAMPLE_PERIOD)
1608 result += sizeof(u64);
1609
1610 if (type & PERF_SAMPLE_READ) {
1611 result += sizeof(u64);
1612 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1613 result += sizeof(u64);
1614 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1615 result += sizeof(u64);
1616 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1617 if (read_format & PERF_FORMAT_GROUP) {
1618 sz = sample->read.group.nr *
1619 sizeof(struct sample_read_value);
1620 result += sz;
1621 } else {
1622 result += sizeof(u64);
1623 }
1624 }
1625
1626 if (type & PERF_SAMPLE_CALLCHAIN) {
1627 sz = (sample->callchain->nr + 1) * sizeof(u64);
1628 result += sz;
1629 }
1630
1631 if (type & PERF_SAMPLE_RAW) {
1632 result += sizeof(u32);
1633 result += sample->raw_size;
1634 }
1635
1636 if (type & PERF_SAMPLE_BRANCH_STACK) {
1637 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1638 sz += sizeof(u64);
1639 result += sz;
1640 }
1641
1642 if (type & PERF_SAMPLE_REGS_USER) {
1643 if (sample->user_regs.abi) {
1644 result += sizeof(u64);
1645 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1646 result += sz;
1647 } else {
1648 result += sizeof(u64);
1649 }
1650 }
1651
1652 if (type & PERF_SAMPLE_STACK_USER) {
1653 sz = sample->user_stack.size;
1654 result += sizeof(u64);
1655 if (sz) {
1656 result += sz;
1657 result += sizeof(u64);
1658 }
1659 }
1660
1661 if (type & PERF_SAMPLE_WEIGHT)
1662 result += sizeof(u64);
1663
1664 if (type & PERF_SAMPLE_DATA_SRC)
1665 result += sizeof(u64);
1666
1667 if (type & PERF_SAMPLE_TRANSACTION)
1668 result += sizeof(u64);
1669
1670 if (type & PERF_SAMPLE_REGS_INTR) {
1671 if (sample->intr_regs.abi) {
1672 result += sizeof(u64);
1673 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1674 result += sz;
1675 } else {
1676 result += sizeof(u64);
1677 }
1678 }
1679
1680 return result;
1681 }
1682
1683 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1684 u64 read_format,
1685 const struct perf_sample *sample,
1686 bool swapped)
1687 {
1688 u64 *array;
1689 size_t sz;
1690 /*
1691 * used for cross-endian analysis. See git commit 65014ab3
1692 * for why this goofiness is needed.
1693 */
1694 union u64_swap u;
1695
1696 array = event->sample.array;
1697
1698 if (type & PERF_SAMPLE_IDENTIFIER) {
1699 *array = sample->id;
1700 array++;
1701 }
1702
1703 if (type & PERF_SAMPLE_IP) {
1704 *array = sample->ip;
1705 array++;
1706 }
1707
1708 if (type & PERF_SAMPLE_TID) {
1709 u.val32[0] = sample->pid;
1710 u.val32[1] = sample->tid;
1711 if (swapped) {
1712 /*
1713 * Inverse of what is done in perf_evsel__parse_sample
1714 */
1715 u.val32[0] = bswap_32(u.val32[0]);
1716 u.val32[1] = bswap_32(u.val32[1]);
1717 u.val64 = bswap_64(u.val64);
1718 }
1719
1720 *array = u.val64;
1721 array++;
1722 }
1723
1724 if (type & PERF_SAMPLE_TIME) {
1725 *array = sample->time;
1726 array++;
1727 }
1728
1729 if (type & PERF_SAMPLE_ADDR) {
1730 *array = sample->addr;
1731 array++;
1732 }
1733
1734 if (type & PERF_SAMPLE_ID) {
1735 *array = sample->id;
1736 array++;
1737 }
1738
1739 if (type & PERF_SAMPLE_STREAM_ID) {
1740 *array = sample->stream_id;
1741 array++;
1742 }
1743
1744 if (type & PERF_SAMPLE_CPU) {
1745 u.val32[0] = sample->cpu;
1746 if (swapped) {
1747 /*
1748 * Inverse of what is done in perf_evsel__parse_sample
1749 */
1750 u.val32[0] = bswap_32(u.val32[0]);
1751 u.val64 = bswap_64(u.val64);
1752 }
1753 *array = u.val64;
1754 array++;
1755 }
1756
1757 if (type & PERF_SAMPLE_PERIOD) {
1758 *array = sample->period;
1759 array++;
1760 }
1761
1762 if (type & PERF_SAMPLE_READ) {
1763 if (read_format & PERF_FORMAT_GROUP)
1764 *array = sample->read.group.nr;
1765 else
1766 *array = sample->read.one.value;
1767 array++;
1768
1769 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1770 *array = sample->read.time_enabled;
1771 array++;
1772 }
1773
1774 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1775 *array = sample->read.time_running;
1776 array++;
1777 }
1778
1779 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1780 if (read_format & PERF_FORMAT_GROUP) {
1781 sz = sample->read.group.nr *
1782 sizeof(struct sample_read_value);
1783 memcpy(array, sample->read.group.values, sz);
1784 array = (void *)array + sz;
1785 } else {
1786 *array = sample->read.one.id;
1787 array++;
1788 }
1789 }
1790
1791 if (type & PERF_SAMPLE_CALLCHAIN) {
1792 sz = (sample->callchain->nr + 1) * sizeof(u64);
1793 memcpy(array, sample->callchain, sz);
1794 array = (void *)array + sz;
1795 }
1796
1797 if (type & PERF_SAMPLE_RAW) {
1798 u.val32[0] = sample->raw_size;
1799 if (WARN_ONCE(swapped,
1800 "Endianness of raw data not corrected!\n")) {
1801 /*
1802 * Inverse of what is done in perf_evsel__parse_sample
1803 */
1804 u.val32[0] = bswap_32(u.val32[0]);
1805 u.val32[1] = bswap_32(u.val32[1]);
1806 u.val64 = bswap_64(u.val64);
1807 }
1808 *array = u.val64;
1809 array = (void *)array + sizeof(u32);
1810
1811 memcpy(array, sample->raw_data, sample->raw_size);
1812 array = (void *)array + sample->raw_size;
1813 }
1814
1815 if (type & PERF_SAMPLE_BRANCH_STACK) {
1816 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1817 sz += sizeof(u64);
1818 memcpy(array, sample->branch_stack, sz);
1819 array = (void *)array + sz;
1820 }
1821
1822 if (type & PERF_SAMPLE_REGS_USER) {
1823 if (sample->user_regs.abi) {
1824 *array++ = sample->user_regs.abi;
1825 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1826 memcpy(array, sample->user_regs.regs, sz);
1827 array = (void *)array + sz;
1828 } else {
1829 *array++ = 0;
1830 }
1831 }
1832
1833 if (type & PERF_SAMPLE_STACK_USER) {
1834 sz = sample->user_stack.size;
1835 *array++ = sz;
1836 if (sz) {
1837 memcpy(array, sample->user_stack.data, sz);
1838 array = (void *)array + sz;
1839 *array++ = sz;
1840 }
1841 }
1842
1843 if (type & PERF_SAMPLE_WEIGHT) {
1844 *array = sample->weight;
1845 array++;
1846 }
1847
1848 if (type & PERF_SAMPLE_DATA_SRC) {
1849 *array = sample->data_src;
1850 array++;
1851 }
1852
1853 if (type & PERF_SAMPLE_TRANSACTION) {
1854 *array = sample->transaction;
1855 array++;
1856 }
1857
1858 if (type & PERF_SAMPLE_REGS_INTR) {
1859 if (sample->intr_regs.abi) {
1860 *array++ = sample->intr_regs.abi;
1861 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1862 memcpy(array, sample->intr_regs.regs, sz);
1863 array = (void *)array + sz;
1864 } else {
1865 *array++ = 0;
1866 }
1867 }
1868
1869 return 0;
1870 }
1871
1872 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
1873 {
1874 return pevent_find_field(evsel->tp_format, name);
1875 }
1876
1877 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
1878 const char *name)
1879 {
1880 struct format_field *field = perf_evsel__field(evsel, name);
1881 int offset;
1882
1883 if (!field)
1884 return NULL;
1885
1886 offset = field->offset;
1887
1888 if (field->flags & FIELD_IS_DYNAMIC) {
1889 offset = *(int *)(sample->raw_data + field->offset);
1890 offset &= 0xffff;
1891 }
1892
1893 return sample->raw_data + offset;
1894 }
1895
1896 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
1897 const char *name)
1898 {
1899 struct format_field *field = perf_evsel__field(evsel, name);
1900 void *ptr;
1901 u64 value;
1902
1903 if (!field)
1904 return 0;
1905
1906 ptr = sample->raw_data + field->offset;
1907
1908 switch (field->size) {
1909 case 1:
1910 return *(u8 *)ptr;
1911 case 2:
1912 value = *(u16 *)ptr;
1913 break;
1914 case 4:
1915 value = *(u32 *)ptr;
1916 break;
1917 case 8:
1918 value = *(u64 *)ptr;
1919 break;
1920 default:
1921 return 0;
1922 }
1923
1924 if (!evsel->needs_swap)
1925 return value;
1926
1927 switch (field->size) {
1928 case 2:
1929 return bswap_16(value);
1930 case 4:
1931 return bswap_32(value);
1932 case 8:
1933 return bswap_64(value);
1934 default:
1935 return 0;
1936 }
1937
1938 return 0;
1939 }
1940
1941 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
1942 {
1943 va_list args;
1944 int ret = 0;
1945
1946 if (!*first) {
1947 ret += fprintf(fp, ",");
1948 } else {
1949 ret += fprintf(fp, ":");
1950 *first = false;
1951 }
1952
1953 va_start(args, fmt);
1954 ret += vfprintf(fp, fmt, args);
1955 va_end(args);
1956 return ret;
1957 }
1958
1959 static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
1960 {
1961 if (value == 0)
1962 return 0;
1963
1964 return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
1965 }
1966
1967 #define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
1968
1969 struct bit_names {
1970 int bit;
1971 const char *name;
1972 };
1973
1974 static int bits__fprintf(FILE *fp, const char *field, u64 value,
1975 struct bit_names *bits, bool *first)
1976 {
1977 int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
1978 bool first_bit = true;
1979
1980 do {
1981 if (value & bits[i].bit) {
1982 printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
1983 first_bit = false;
1984 }
1985 } while (bits[++i].name != NULL);
1986
1987 return printed;
1988 }
1989
1990 static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
1991 {
1992 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1993 struct bit_names bits[] = {
1994 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1995 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1996 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1997 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1998 bit_name(IDENTIFIER), bit_name(REGS_INTR),
1999 { .name = NULL, }
2000 };
2001 #undef bit_name
2002 return bits__fprintf(fp, "sample_type", value, bits, first);
2003 }
2004
2005 static int read_format__fprintf(FILE *fp, bool *first, u64 value)
2006 {
2007 #define bit_name(n) { PERF_FORMAT_##n, #n }
2008 struct bit_names bits[] = {
2009 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
2010 bit_name(ID), bit_name(GROUP),
2011 { .name = NULL, }
2012 };
2013 #undef bit_name
2014 return bits__fprintf(fp, "read_format", value, bits, first);
2015 }
2016
2017 int perf_evsel__fprintf(struct perf_evsel *evsel,
2018 struct perf_attr_details *details, FILE *fp)
2019 {
2020 bool first = true;
2021 int printed = 0;
2022
2023 if (details->event_group) {
2024 struct perf_evsel *pos;
2025
2026 if (!perf_evsel__is_group_leader(evsel))
2027 return 0;
2028
2029 if (evsel->nr_members > 1)
2030 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2031
2032 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2033 for_each_group_member(pos, evsel)
2034 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2035
2036 if (evsel->nr_members > 1)
2037 printed += fprintf(fp, "}");
2038 goto out;
2039 }
2040
2041 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2042
2043 if (details->verbose || details->freq) {
2044 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
2045 (u64)evsel->attr.sample_freq);
2046 }
2047
2048 if (details->verbose) {
2049 if_print(type);
2050 if_print(config);
2051 if_print(config1);
2052 if_print(config2);
2053 if_print(size);
2054 printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
2055 if (evsel->attr.read_format)
2056 printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
2057 if_print(disabled);
2058 if_print(inherit);
2059 if_print(pinned);
2060 if_print(exclusive);
2061 if_print(exclude_user);
2062 if_print(exclude_kernel);
2063 if_print(exclude_hv);
2064 if_print(exclude_idle);
2065 if_print(mmap);
2066 if_print(mmap2);
2067 if_print(comm);
2068 if_print(comm_exec);
2069 if_print(freq);
2070 if_print(inherit_stat);
2071 if_print(enable_on_exec);
2072 if_print(task);
2073 if_print(watermark);
2074 if_print(precise_ip);
2075 if_print(mmap_data);
2076 if_print(sample_id_all);
2077 if_print(exclude_host);
2078 if_print(exclude_guest);
2079 if_print(__reserved_1);
2080 if_print(wakeup_events);
2081 if_print(bp_type);
2082 if_print(branch_sample_type);
2083 }
2084 out:
2085 fputc('\n', fp);
2086 return ++printed;
2087 }
2088
2089 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2090 char *msg, size_t msgsize)
2091 {
2092 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2093 evsel->attr.type == PERF_TYPE_HARDWARE &&
2094 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2095 /*
2096 * If it's cycles then fall back to hrtimer based
2097 * cpu-clock-tick sw counter, which is always available even if
2098 * no PMU support.
2099 *
2100 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2101 * b0a873e).
2102 */
2103 scnprintf(msg, msgsize, "%s",
2104 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2105
2106 evsel->attr.type = PERF_TYPE_SOFTWARE;
2107 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2108
2109 zfree(&evsel->name);
2110 return true;
2111 }
2112
2113 return false;
2114 }
2115
2116 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2117 int err, char *msg, size_t size)
2118 {
2119 char sbuf[STRERR_BUFSIZE];
2120
2121 switch (err) {
2122 case EPERM:
2123 case EACCES:
2124 return scnprintf(msg, size,
2125 "You may not have permission to collect %sstats.\n"
2126 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
2127 " -1 - Not paranoid at all\n"
2128 " 0 - Disallow raw tracepoint access for unpriv\n"
2129 " 1 - Disallow cpu events for unpriv\n"
2130 " 2 - Disallow kernel profiling for unpriv",
2131 target->system_wide ? "system-wide " : "");
2132 case ENOENT:
2133 return scnprintf(msg, size, "The %s event is not supported.",
2134 perf_evsel__name(evsel));
2135 case EMFILE:
2136 return scnprintf(msg, size, "%s",
2137 "Too many events are opened.\n"
2138 "Try again after reducing the number of events.");
2139 case ENODEV:
2140 if (target->cpu_list)
2141 return scnprintf(msg, size, "%s",
2142 "No such device - did you specify an out-of-range profile CPU?\n");
2143 break;
2144 case EOPNOTSUPP:
2145 if (evsel->attr.precise_ip)
2146 return scnprintf(msg, size, "%s",
2147 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2148 #if defined(__i386__) || defined(__x86_64__)
2149 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2150 return scnprintf(msg, size, "%s",
2151 "No hardware sampling interrupt available.\n"
2152 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2153 #endif
2154 break;
2155 case EBUSY:
2156 if (find_process("oprofiled"))
2157 return scnprintf(msg, size,
2158 "The PMU counters are busy/taken by another profiler.\n"
2159 "We found oprofile daemon running, please stop it and try again.");
2160 break;
2161 default:
2162 break;
2163 }
2164
2165 return scnprintf(msg, size,
2166 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2167 "/bin/dmesg may provide additional information.\n"
2168 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2169 err, strerror_r(err, sbuf, sizeof(sbuf)),
2170 perf_evsel__name(evsel));
2171 }
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