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perf evsel: Set attr.task bit for a tracking event
[linux-2.6/btrfs-unstable.git] / tools / perf / util / evsel.c
blobea51a90e20a0e9daa1a3f57c7dcf289b83299061
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 {
542 bool function = perf_evsel__is_function_event(evsel);
543 struct perf_event_attr *attr = &evsel->attr;
544
545 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
546
547 if (callchain_param.record_mode == CALLCHAIN_DWARF) {
548 if (!function) {
549 perf_evsel__set_sample_bit(evsel, REGS_USER);
550 perf_evsel__set_sample_bit(evsel, STACK_USER);
551 attr->sample_regs_user = PERF_REGS_MASK;
552 attr->sample_stack_user = callchain_param.dump_size;
553 attr->exclude_callchain_user = 1;
554 } else {
555 pr_info("Cannot use DWARF unwind for function trace event,"
556 " falling back to framepointers.\n");
557 }
558 }
559
560 if (function) {
561 pr_info("Disabling user space callchains for function trace event.\n");
562 attr->exclude_callchain_user = 1;
563 }
564 }
565
566 /*
567 * The enable_on_exec/disabled value strategy:
568 *
569 * 1) For any type of traced program:
570 * - all independent events and group leaders are disabled
571 * - all group members are enabled
572 *
573 * Group members are ruled by group leaders. They need to
574 * be enabled, because the group scheduling relies on that.
575 *
576 * 2) For traced programs executed by perf:
577 * - all independent events and group leaders have
578 * enable_on_exec set
579 * - we don't specifically enable or disable any event during
580 * the record command
581 *
582 * Independent events and group leaders are initially disabled
583 * and get enabled by exec. Group members are ruled by group
584 * leaders as stated in 1).
585 *
586 * 3) For traced programs attached by perf (pid/tid):
587 * - we specifically enable or disable all events during
588 * the record command
589 *
590 * When attaching events to already running traced we
591 * enable/disable events specifically, as there's no
592 * initial traced exec call.
593 */
594 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
595 {
596 struct perf_evsel *leader = evsel->leader;
597 struct perf_event_attr *attr = &evsel->attr;
598 int track = evsel->tracking;
599 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
600
601 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
602 attr->inherit = !opts->no_inherit;
603
604 perf_evsel__set_sample_bit(evsel, IP);
605 perf_evsel__set_sample_bit(evsel, TID);
606
607 if (evsel->sample_read) {
608 perf_evsel__set_sample_bit(evsel, READ);
609
610 /*
611 * We need ID even in case of single event, because
612 * PERF_SAMPLE_READ process ID specific data.
613 */
614 perf_evsel__set_sample_id(evsel, false);
615
616 /*
617 * Apply group format only if we belong to group
618 * with more than one members.
619 */
620 if (leader->nr_members > 1) {
621 attr->read_format |= PERF_FORMAT_GROUP;
622 attr->inherit = 0;
623 }
624 }
625
626 /*
627 * We default some events to have a default interval. But keep
628 * it a weak assumption overridable by the user.
629 */
630 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
631 opts->user_interval != ULLONG_MAX)) {
632 if (opts->freq) {
633 perf_evsel__set_sample_bit(evsel, PERIOD);
634 attr->freq = 1;
635 attr->sample_freq = opts->freq;
636 } else {
637 attr->sample_period = opts->default_interval;
638 }
639 }
640
641 /*
642 * Disable sampling for all group members other
643 * than leader in case leader 'leads' the sampling.
644 */
645 if ((leader != evsel) && leader->sample_read) {
646 attr->sample_freq = 0;
647 attr->sample_period = 0;
648 }
649
650 if (opts->no_samples)
651 attr->sample_freq = 0;
652
653 if (opts->inherit_stat)
654 attr->inherit_stat = 1;
655
656 if (opts->sample_address) {
657 perf_evsel__set_sample_bit(evsel, ADDR);
658 attr->mmap_data = track;
659 }
660
661 /*
662 * We don't allow user space callchains for function trace
663 * event, due to issues with page faults while tracing page
664 * fault handler and its overall trickiness nature.
665 */
666 if (perf_evsel__is_function_event(evsel))
667 evsel->attr.exclude_callchain_user = 1;
668
669 if (callchain_param.enabled && !evsel->no_aux_samples)
670 perf_evsel__config_callgraph(evsel);
671
672 if (opts->sample_intr_regs) {
673 attr->sample_regs_intr = PERF_REGS_MASK;
674 perf_evsel__set_sample_bit(evsel, REGS_INTR);
675 }
676
677 if (target__has_cpu(&opts->target))
678 perf_evsel__set_sample_bit(evsel, CPU);
679
680 if (opts->period)
681 perf_evsel__set_sample_bit(evsel, PERIOD);
682
683 /*
684 * When the user explicitely disabled time don't force it here.
685 */
686 if (opts->sample_time &&
687 (!perf_missing_features.sample_id_all &&
688 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu)))
689 perf_evsel__set_sample_bit(evsel, TIME);
690
691 if (opts->raw_samples && !evsel->no_aux_samples) {
692 perf_evsel__set_sample_bit(evsel, TIME);
693 perf_evsel__set_sample_bit(evsel, RAW);
694 perf_evsel__set_sample_bit(evsel, CPU);
695 }
696
697 if (opts->sample_address)
698 perf_evsel__set_sample_bit(evsel, DATA_SRC);
699
700 if (opts->no_buffering) {
701 attr->watermark = 0;
702 attr->wakeup_events = 1;
703 }
704 if (opts->branch_stack && !evsel->no_aux_samples) {
705 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
706 attr->branch_sample_type = opts->branch_stack;
707 }
708
709 if (opts->sample_weight)
710 perf_evsel__set_sample_bit(evsel, WEIGHT);
711
712 attr->task = track;
713 attr->mmap = track;
714 attr->mmap2 = track && !perf_missing_features.mmap2;
715 attr->comm = track;
716
717 if (opts->sample_transaction)
718 perf_evsel__set_sample_bit(evsel, TRANSACTION);
719
720 /*
721 * XXX see the function comment above
722 *
723 * Disabling only independent events or group leaders,
724 * keeping group members enabled.
725 */
726 if (perf_evsel__is_group_leader(evsel))
727 attr->disabled = 1;
728
729 /*
730 * Setting enable_on_exec for independent events and
731 * group leaders for traced executed by perf.
732 */
733 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
734 !opts->initial_delay)
735 attr->enable_on_exec = 1;
736
737 if (evsel->immediate) {
738 attr->disabled = 0;
739 attr->enable_on_exec = 0;
740 }
741 }
742
743 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
744 {
745 int cpu, thread;
746
747 if (evsel->system_wide)
748 nthreads = 1;
749
750 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
751
752 if (evsel->fd) {
753 for (cpu = 0; cpu < ncpus; cpu++) {
754 for (thread = 0; thread < nthreads; thread++) {
755 FD(evsel, cpu, thread) = -1;
756 }
757 }
758 }
759
760 return evsel->fd != NULL ? 0 : -ENOMEM;
761 }
762
763 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
764 int ioc, void *arg)
765 {
766 int cpu, thread;
767
768 if (evsel->system_wide)
769 nthreads = 1;
770
771 for (cpu = 0; cpu < ncpus; cpu++) {
772 for (thread = 0; thread < nthreads; thread++) {
773 int fd = FD(evsel, cpu, thread),
774 err = ioctl(fd, ioc, arg);
775
776 if (err)
777 return err;
778 }
779 }
780
781 return 0;
782 }
783
784 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
785 const char *filter)
786 {
787 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
788 PERF_EVENT_IOC_SET_FILTER,
789 (void *)filter);
790 }
791
792 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
793 {
794 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
795 PERF_EVENT_IOC_ENABLE,
796 0);
797 }
798
799 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
800 {
801 if (ncpus == 0 || nthreads == 0)
802 return 0;
803
804 if (evsel->system_wide)
805 nthreads = 1;
806
807 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
808 if (evsel->sample_id == NULL)
809 return -ENOMEM;
810
811 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
812 if (evsel->id == NULL) {
813 xyarray__delete(evsel->sample_id);
814 evsel->sample_id = NULL;
815 return -ENOMEM;
816 }
817
818 return 0;
819 }
820
821 void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
822 {
823 memset(evsel->counts, 0, (sizeof(*evsel->counts) +
824 (ncpus * sizeof(struct perf_counts_values))));
825 }
826
827 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
828 {
829 evsel->counts = zalloc((sizeof(*evsel->counts) +
830 (ncpus * sizeof(struct perf_counts_values))));
831 return evsel->counts != NULL ? 0 : -ENOMEM;
832 }
833
834 static void perf_evsel__free_fd(struct perf_evsel *evsel)
835 {
836 xyarray__delete(evsel->fd);
837 evsel->fd = NULL;
838 }
839
840 static void perf_evsel__free_id(struct perf_evsel *evsel)
841 {
842 xyarray__delete(evsel->sample_id);
843 evsel->sample_id = NULL;
844 zfree(&evsel->id);
845 }
846
847 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
848 {
849 int cpu, thread;
850
851 if (evsel->system_wide)
852 nthreads = 1;
853
854 for (cpu = 0; cpu < ncpus; cpu++)
855 for (thread = 0; thread < nthreads; ++thread) {
856 close(FD(evsel, cpu, thread));
857 FD(evsel, cpu, thread) = -1;
858 }
859 }
860
861 void perf_evsel__free_counts(struct perf_evsel *evsel)
862 {
863 zfree(&evsel->counts);
864 }
865
866 void perf_evsel__exit(struct perf_evsel *evsel)
867 {
868 assert(list_empty(&evsel->node));
869 perf_evsel__free_fd(evsel);
870 perf_evsel__free_id(evsel);
871 close_cgroup(evsel->cgrp);
872 zfree(&evsel->group_name);
873 zfree(&evsel->name);
874 perf_evsel__object.fini(evsel);
875 }
876
877 void perf_evsel__delete(struct perf_evsel *evsel)
878 {
879 perf_evsel__exit(evsel);
880 free(evsel);
881 }
882
883 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu,
884 struct perf_counts_values *count)
885 {
886 struct perf_counts_values tmp;
887
888 if (!evsel->prev_raw_counts)
889 return;
890
891 if (cpu == -1) {
892 tmp = evsel->prev_raw_counts->aggr;
893 evsel->prev_raw_counts->aggr = *count;
894 } else {
895 tmp = evsel->prev_raw_counts->cpu[cpu];
896 evsel->prev_raw_counts->cpu[cpu] = *count;
897 }
898
899 count->val = count->val - tmp.val;
900 count->ena = count->ena - tmp.ena;
901 count->run = count->run - tmp.run;
902 }
903
904 void perf_counts_values__scale(struct perf_counts_values *count,
905 bool scale, s8 *pscaled)
906 {
907 s8 scaled = 0;
908
909 if (scale) {
910 if (count->run == 0) {
911 scaled = -1;
912 count->val = 0;
913 } else if (count->run < count->ena) {
914 scaled = 1;
915 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
916 }
917 } else
918 count->ena = count->run = 0;
919
920 if (pscaled)
921 *pscaled = scaled;
922 }
923
924 int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
925 perf_evsel__read_cb_t cb)
926 {
927 struct perf_counts_values count;
928
929 memset(&count, 0, sizeof(count));
930
931 if (FD(evsel, cpu, thread) < 0)
932 return -EINVAL;
933
934 if (readn(FD(evsel, cpu, thread), &count, sizeof(count)) < 0)
935 return -errno;
936
937 return cb(evsel, cpu, thread, &count);
938 }
939
940 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
941 int cpu, int thread, bool scale)
942 {
943 struct perf_counts_values count;
944 size_t nv = scale ? 3 : 1;
945
946 if (FD(evsel, cpu, thread) < 0)
947 return -EINVAL;
948
949 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
950 return -ENOMEM;
951
952 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
953 return -errno;
954
955 perf_evsel__compute_deltas(evsel, cpu, &count);
956 perf_counts_values__scale(&count, scale, NULL);
957 evsel->counts->cpu[cpu] = count;
958 return 0;
959 }
960
961 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
962 {
963 struct perf_evsel *leader = evsel->leader;
964 int fd;
965
966 if (perf_evsel__is_group_leader(evsel))
967 return -1;
968
969 /*
970 * Leader must be already processed/open,
971 * if not it's a bug.
972 */
973 BUG_ON(!leader->fd);
974
975 fd = FD(leader, cpu, thread);
976 BUG_ON(fd == -1);
977
978 return fd;
979 }
980
981 #define __PRINT_ATTR(fmt, cast, field) \
982 fprintf(fp, " %-19s "fmt"\n", #field, cast attr->field)
983
984 #define PRINT_ATTR_U32(field) __PRINT_ATTR("%u" , , field)
985 #define PRINT_ATTR_X32(field) __PRINT_ATTR("%#x", , field)
986 #define PRINT_ATTR_U64(field) __PRINT_ATTR("%" PRIu64, (uint64_t), field)
987 #define PRINT_ATTR_X64(field) __PRINT_ATTR("%#"PRIx64, (uint64_t), field)
988
989 #define PRINT_ATTR2N(name1, field1, name2, field2) \
990 fprintf(fp, " %-19s %u %-19s %u\n", \
991 name1, attr->field1, name2, attr->field2)
992
993 #define PRINT_ATTR2(field1, field2) \
994 PRINT_ATTR2N(#field1, field1, #field2, field2)
995
996 static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
997 {
998 size_t ret = 0;
999
1000 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
1001 ret += fprintf(fp, "perf_event_attr:\n");
1002
1003 ret += PRINT_ATTR_U32(type);
1004 ret += PRINT_ATTR_U32(size);
1005 ret += PRINT_ATTR_X64(config);
1006 ret += PRINT_ATTR_U64(sample_period);
1007 ret += PRINT_ATTR_U64(sample_freq);
1008 ret += PRINT_ATTR_X64(sample_type);
1009 ret += PRINT_ATTR_X64(read_format);
1010
1011 ret += PRINT_ATTR2(disabled, inherit);
1012 ret += PRINT_ATTR2(pinned, exclusive);
1013 ret += PRINT_ATTR2(exclude_user, exclude_kernel);
1014 ret += PRINT_ATTR2(exclude_hv, exclude_idle);
1015 ret += PRINT_ATTR2(mmap, comm);
1016 ret += PRINT_ATTR2(mmap2, comm_exec);
1017 ret += PRINT_ATTR2(freq, inherit_stat);
1018 ret += PRINT_ATTR2(enable_on_exec, task);
1019 ret += PRINT_ATTR2(watermark, precise_ip);
1020 ret += PRINT_ATTR2(mmap_data, sample_id_all);
1021 ret += PRINT_ATTR2(exclude_host, exclude_guest);
1022 ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel,
1023 "excl.callchain_user", exclude_callchain_user);
1024
1025 ret += PRINT_ATTR_U32(wakeup_events);
1026 ret += PRINT_ATTR_U32(wakeup_watermark);
1027 ret += PRINT_ATTR_X32(bp_type);
1028 ret += PRINT_ATTR_X64(bp_addr);
1029 ret += PRINT_ATTR_X64(config1);
1030 ret += PRINT_ATTR_U64(bp_len);
1031 ret += PRINT_ATTR_X64(config2);
1032 ret += PRINT_ATTR_X64(branch_sample_type);
1033 ret += PRINT_ATTR_X64(sample_regs_user);
1034 ret += PRINT_ATTR_U32(sample_stack_user);
1035 ret += PRINT_ATTR_X64(sample_regs_intr);
1036
1037 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
1038
1039 return ret;
1040 }
1041
1042 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1043 struct thread_map *threads)
1044 {
1045 int cpu, thread, nthreads;
1046 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1047 int pid = -1, err;
1048 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1049
1050 if (evsel->system_wide)
1051 nthreads = 1;
1052 else
1053 nthreads = threads->nr;
1054
1055 if (evsel->fd == NULL &&
1056 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1057 return -ENOMEM;
1058
1059 if (evsel->cgrp) {
1060 flags |= PERF_FLAG_PID_CGROUP;
1061 pid = evsel->cgrp->fd;
1062 }
1063
1064 fallback_missing_features:
1065 if (perf_missing_features.cloexec)
1066 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1067 if (perf_missing_features.mmap2)
1068 evsel->attr.mmap2 = 0;
1069 if (perf_missing_features.exclude_guest)
1070 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1071 retry_sample_id:
1072 if (perf_missing_features.sample_id_all)
1073 evsel->attr.sample_id_all = 0;
1074
1075 if (verbose >= 2)
1076 perf_event_attr__fprintf(&evsel->attr, stderr);
1077
1078 for (cpu = 0; cpu < cpus->nr; cpu++) {
1079
1080 for (thread = 0; thread < nthreads; thread++) {
1081 int group_fd;
1082
1083 if (!evsel->cgrp && !evsel->system_wide)
1084 pid = threads->map[thread];
1085
1086 group_fd = get_group_fd(evsel, cpu, thread);
1087 retry_open:
1088 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1089 pid, cpus->map[cpu], group_fd, flags);
1090
1091 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1092 pid,
1093 cpus->map[cpu],
1094 group_fd, flags);
1095 if (FD(evsel, cpu, thread) < 0) {
1096 err = -errno;
1097 pr_debug2("sys_perf_event_open failed, error %d\n",
1098 err);
1099 goto try_fallback;
1100 }
1101 set_rlimit = NO_CHANGE;
1102 }
1103 }
1104
1105 return 0;
1106
1107 try_fallback:
1108 /*
1109 * perf stat needs between 5 and 22 fds per CPU. When we run out
1110 * of them try to increase the limits.
1111 */
1112 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1113 struct rlimit l;
1114 int old_errno = errno;
1115
1116 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1117 if (set_rlimit == NO_CHANGE)
1118 l.rlim_cur = l.rlim_max;
1119 else {
1120 l.rlim_cur = l.rlim_max + 1000;
1121 l.rlim_max = l.rlim_cur;
1122 }
1123 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1124 set_rlimit++;
1125 errno = old_errno;
1126 goto retry_open;
1127 }
1128 }
1129 errno = old_errno;
1130 }
1131
1132 if (err != -EINVAL || cpu > 0 || thread > 0)
1133 goto out_close;
1134
1135 if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1136 perf_missing_features.cloexec = true;
1137 goto fallback_missing_features;
1138 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1139 perf_missing_features.mmap2 = true;
1140 goto fallback_missing_features;
1141 } else if (!perf_missing_features.exclude_guest &&
1142 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1143 perf_missing_features.exclude_guest = true;
1144 goto fallback_missing_features;
1145 } else if (!perf_missing_features.sample_id_all) {
1146 perf_missing_features.sample_id_all = true;
1147 goto retry_sample_id;
1148 }
1149
1150 out_close:
1151 do {
1152 while (--thread >= 0) {
1153 close(FD(evsel, cpu, thread));
1154 FD(evsel, cpu, thread) = -1;
1155 }
1156 thread = nthreads;
1157 } while (--cpu >= 0);
1158 return err;
1159 }
1160
1161 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1162 {
1163 if (evsel->fd == NULL)
1164 return;
1165
1166 perf_evsel__close_fd(evsel, ncpus, nthreads);
1167 perf_evsel__free_fd(evsel);
1168 }
1169
1170 static struct {
1171 struct cpu_map map;
1172 int cpus[1];
1173 } empty_cpu_map = {
1174 .map.nr = 1,
1175 .cpus = { -1, },
1176 };
1177
1178 static struct {
1179 struct thread_map map;
1180 int threads[1];
1181 } empty_thread_map = {
1182 .map.nr = 1,
1183 .threads = { -1, },
1184 };
1185
1186 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1187 struct thread_map *threads)
1188 {
1189 if (cpus == NULL) {
1190 /* Work around old compiler warnings about strict aliasing */
1191 cpus = &empty_cpu_map.map;
1192 }
1193
1194 if (threads == NULL)
1195 threads = &empty_thread_map.map;
1196
1197 return __perf_evsel__open(evsel, cpus, threads);
1198 }
1199
1200 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1201 struct cpu_map *cpus)
1202 {
1203 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1204 }
1205
1206 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1207 struct thread_map *threads)
1208 {
1209 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1210 }
1211
1212 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1213 const union perf_event *event,
1214 struct perf_sample *sample)
1215 {
1216 u64 type = evsel->attr.sample_type;
1217 const u64 *array = event->sample.array;
1218 bool swapped = evsel->needs_swap;
1219 union u64_swap u;
1220
1221 array += ((event->header.size -
1222 sizeof(event->header)) / sizeof(u64)) - 1;
1223
1224 if (type & PERF_SAMPLE_IDENTIFIER) {
1225 sample->id = *array;
1226 array--;
1227 }
1228
1229 if (type & PERF_SAMPLE_CPU) {
1230 u.val64 = *array;
1231 if (swapped) {
1232 /* undo swap of u64, then swap on individual u32s */
1233 u.val64 = bswap_64(u.val64);
1234 u.val32[0] = bswap_32(u.val32[0]);
1235 }
1236
1237 sample->cpu = u.val32[0];
1238 array--;
1239 }
1240
1241 if (type & PERF_SAMPLE_STREAM_ID) {
1242 sample->stream_id = *array;
1243 array--;
1244 }
1245
1246 if (type & PERF_SAMPLE_ID) {
1247 sample->id = *array;
1248 array--;
1249 }
1250
1251 if (type & PERF_SAMPLE_TIME) {
1252 sample->time = *array;
1253 array--;
1254 }
1255
1256 if (type & PERF_SAMPLE_TID) {
1257 u.val64 = *array;
1258 if (swapped) {
1259 /* undo swap of u64, then swap on individual u32s */
1260 u.val64 = bswap_64(u.val64);
1261 u.val32[0] = bswap_32(u.val32[0]);
1262 u.val32[1] = bswap_32(u.val32[1]);
1263 }
1264
1265 sample->pid = u.val32[0];
1266 sample->tid = u.val32[1];
1267 array--;
1268 }
1269
1270 return 0;
1271 }
1272
1273 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1274 u64 size)
1275 {
1276 return size > max_size || offset + size > endp;
1277 }
1278
1279 #define OVERFLOW_CHECK(offset, size, max_size) \
1280 do { \
1281 if (overflow(endp, (max_size), (offset), (size))) \
1282 return -EFAULT; \
1283 } while (0)
1284
1285 #define OVERFLOW_CHECK_u64(offset) \
1286 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1287
1288 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1289 struct perf_sample *data)
1290 {
1291 u64 type = evsel->attr.sample_type;
1292 bool swapped = evsel->needs_swap;
1293 const u64 *array;
1294 u16 max_size = event->header.size;
1295 const void *endp = (void *)event + max_size;
1296 u64 sz;
1297
1298 /*
1299 * used for cross-endian analysis. See git commit 65014ab3
1300 * for why this goofiness is needed.
1301 */
1302 union u64_swap u;
1303
1304 memset(data, 0, sizeof(*data));
1305 data->cpu = data->pid = data->tid = -1;
1306 data->stream_id = data->id = data->time = -1ULL;
1307 data->period = evsel->attr.sample_period;
1308 data->weight = 0;
1309
1310 if (event->header.type != PERF_RECORD_SAMPLE) {
1311 if (!evsel->attr.sample_id_all)
1312 return 0;
1313 return perf_evsel__parse_id_sample(evsel, event, data);
1314 }
1315
1316 array = event->sample.array;
1317
1318 /*
1319 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1320 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1321 * check the format does not go past the end of the event.
1322 */
1323 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1324 return -EFAULT;
1325
1326 data->id = -1ULL;
1327 if (type & PERF_SAMPLE_IDENTIFIER) {
1328 data->id = *array;
1329 array++;
1330 }
1331
1332 if (type & PERF_SAMPLE_IP) {
1333 data->ip = *array;
1334 array++;
1335 }
1336
1337 if (type & PERF_SAMPLE_TID) {
1338 u.val64 = *array;
1339 if (swapped) {
1340 /* undo swap of u64, then swap on individual u32s */
1341 u.val64 = bswap_64(u.val64);
1342 u.val32[0] = bswap_32(u.val32[0]);
1343 u.val32[1] = bswap_32(u.val32[1]);
1344 }
1345
1346 data->pid = u.val32[0];
1347 data->tid = u.val32[1];
1348 array++;
1349 }
1350
1351 if (type & PERF_SAMPLE_TIME) {
1352 data->time = *array;
1353 array++;
1354 }
1355
1356 data->addr = 0;
1357 if (type & PERF_SAMPLE_ADDR) {
1358 data->addr = *array;
1359 array++;
1360 }
1361
1362 if (type & PERF_SAMPLE_ID) {
1363 data->id = *array;
1364 array++;
1365 }
1366
1367 if (type & PERF_SAMPLE_STREAM_ID) {
1368 data->stream_id = *array;
1369 array++;
1370 }
1371
1372 if (type & PERF_SAMPLE_CPU) {
1373
1374 u.val64 = *array;
1375 if (swapped) {
1376 /* undo swap of u64, then swap on individual u32s */
1377 u.val64 = bswap_64(u.val64);
1378 u.val32[0] = bswap_32(u.val32[0]);
1379 }
1380
1381 data->cpu = u.val32[0];
1382 array++;
1383 }
1384
1385 if (type & PERF_SAMPLE_PERIOD) {
1386 data->period = *array;
1387 array++;
1388 }
1389
1390 if (type & PERF_SAMPLE_READ) {
1391 u64 read_format = evsel->attr.read_format;
1392
1393 OVERFLOW_CHECK_u64(array);
1394 if (read_format & PERF_FORMAT_GROUP)
1395 data->read.group.nr = *array;
1396 else
1397 data->read.one.value = *array;
1398
1399 array++;
1400
1401 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1402 OVERFLOW_CHECK_u64(array);
1403 data->read.time_enabled = *array;
1404 array++;
1405 }
1406
1407 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1408 OVERFLOW_CHECK_u64(array);
1409 data->read.time_running = *array;
1410 array++;
1411 }
1412
1413 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1414 if (read_format & PERF_FORMAT_GROUP) {
1415 const u64 max_group_nr = UINT64_MAX /
1416 sizeof(struct sample_read_value);
1417
1418 if (data->read.group.nr > max_group_nr)
1419 return -EFAULT;
1420 sz = data->read.group.nr *
1421 sizeof(struct sample_read_value);
1422 OVERFLOW_CHECK(array, sz, max_size);
1423 data->read.group.values =
1424 (struct sample_read_value *)array;
1425 array = (void *)array + sz;
1426 } else {
1427 OVERFLOW_CHECK_u64(array);
1428 data->read.one.id = *array;
1429 array++;
1430 }
1431 }
1432
1433 if (type & PERF_SAMPLE_CALLCHAIN) {
1434 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1435
1436 OVERFLOW_CHECK_u64(array);
1437 data->callchain = (struct ip_callchain *)array++;
1438 if (data->callchain->nr > max_callchain_nr)
1439 return -EFAULT;
1440 sz = data->callchain->nr * sizeof(u64);
1441 OVERFLOW_CHECK(array, sz, max_size);
1442 array = (void *)array + sz;
1443 }
1444
1445 if (type & PERF_SAMPLE_RAW) {
1446 OVERFLOW_CHECK_u64(array);
1447 u.val64 = *array;
1448 if (WARN_ONCE(swapped,
1449 "Endianness of raw data not corrected!\n")) {
1450 /* undo swap of u64, then swap on individual u32s */
1451 u.val64 = bswap_64(u.val64);
1452 u.val32[0] = bswap_32(u.val32[0]);
1453 u.val32[1] = bswap_32(u.val32[1]);
1454 }
1455 data->raw_size = u.val32[0];
1456 array = (void *)array + sizeof(u32);
1457
1458 OVERFLOW_CHECK(array, data->raw_size, max_size);
1459 data->raw_data = (void *)array;
1460 array = (void *)array + data->raw_size;
1461 }
1462
1463 if (type & PERF_SAMPLE_BRANCH_STACK) {
1464 const u64 max_branch_nr = UINT64_MAX /
1465 sizeof(struct branch_entry);
1466
1467 OVERFLOW_CHECK_u64(array);
1468 data->branch_stack = (struct branch_stack *)array++;
1469
1470 if (data->branch_stack->nr > max_branch_nr)
1471 return -EFAULT;
1472 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1473 OVERFLOW_CHECK(array, sz, max_size);
1474 array = (void *)array + sz;
1475 }
1476
1477 if (type & PERF_SAMPLE_REGS_USER) {
1478 OVERFLOW_CHECK_u64(array);
1479 data->user_regs.abi = *array;
1480 array++;
1481
1482 if (data->user_regs.abi) {
1483 u64 mask = evsel->attr.sample_regs_user;
1484
1485 sz = hweight_long(mask) * sizeof(u64);
1486 OVERFLOW_CHECK(array, sz, max_size);
1487 data->user_regs.mask = mask;
1488 data->user_regs.regs = (u64 *)array;
1489 array = (void *)array + sz;
1490 }
1491 }
1492
1493 if (type & PERF_SAMPLE_STACK_USER) {
1494 OVERFLOW_CHECK_u64(array);
1495 sz = *array++;
1496
1497 data->user_stack.offset = ((char *)(array - 1)
1498 - (char *) event);
1499
1500 if (!sz) {
1501 data->user_stack.size = 0;
1502 } else {
1503 OVERFLOW_CHECK(array, sz, max_size);
1504 data->user_stack.data = (char *)array;
1505 array = (void *)array + sz;
1506 OVERFLOW_CHECK_u64(array);
1507 data->user_stack.size = *array++;
1508 if (WARN_ONCE(data->user_stack.size > sz,
1509 "user stack dump failure\n"))
1510 return -EFAULT;
1511 }
1512 }
1513
1514 data->weight = 0;
1515 if (type & PERF_SAMPLE_WEIGHT) {
1516 OVERFLOW_CHECK_u64(array);
1517 data->weight = *array;
1518 array++;
1519 }
1520
1521 data->data_src = PERF_MEM_DATA_SRC_NONE;
1522 if (type & PERF_SAMPLE_DATA_SRC) {
1523 OVERFLOW_CHECK_u64(array);
1524 data->data_src = *array;
1525 array++;
1526 }
1527
1528 data->transaction = 0;
1529 if (type & PERF_SAMPLE_TRANSACTION) {
1530 OVERFLOW_CHECK_u64(array);
1531 data->transaction = *array;
1532 array++;
1533 }
1534
1535 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1536 if (type & PERF_SAMPLE_REGS_INTR) {
1537 OVERFLOW_CHECK_u64(array);
1538 data->intr_regs.abi = *array;
1539 array++;
1540
1541 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1542 u64 mask = evsel->attr.sample_regs_intr;
1543
1544 sz = hweight_long(mask) * sizeof(u64);
1545 OVERFLOW_CHECK(array, sz, max_size);
1546 data->intr_regs.mask = mask;
1547 data->intr_regs.regs = (u64 *)array;
1548 array = (void *)array + sz;
1549 }
1550 }
1551
1552 return 0;
1553 }
1554
1555 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1556 u64 read_format)
1557 {
1558 size_t sz, result = sizeof(struct sample_event);
1559
1560 if (type & PERF_SAMPLE_IDENTIFIER)
1561 result += sizeof(u64);
1562
1563 if (type & PERF_SAMPLE_IP)
1564 result += sizeof(u64);
1565
1566 if (type & PERF_SAMPLE_TID)
1567 result += sizeof(u64);
1568
1569 if (type & PERF_SAMPLE_TIME)
1570 result += sizeof(u64);
1571
1572 if (type & PERF_SAMPLE_ADDR)
1573 result += sizeof(u64);
1574
1575 if (type & PERF_SAMPLE_ID)
1576 result += sizeof(u64);
1577
1578 if (type & PERF_SAMPLE_STREAM_ID)
1579 result += sizeof(u64);
1580
1581 if (type & PERF_SAMPLE_CPU)
1582 result += sizeof(u64);
1583
1584 if (type & PERF_SAMPLE_PERIOD)
1585 result += sizeof(u64);
1586
1587 if (type & PERF_SAMPLE_READ) {
1588 result += sizeof(u64);
1589 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1590 result += sizeof(u64);
1591 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1592 result += sizeof(u64);
1593 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1594 if (read_format & PERF_FORMAT_GROUP) {
1595 sz = sample->read.group.nr *
1596 sizeof(struct sample_read_value);
1597 result += sz;
1598 } else {
1599 result += sizeof(u64);
1600 }
1601 }
1602
1603 if (type & PERF_SAMPLE_CALLCHAIN) {
1604 sz = (sample->callchain->nr + 1) * sizeof(u64);
1605 result += sz;
1606 }
1607
1608 if (type & PERF_SAMPLE_RAW) {
1609 result += sizeof(u32);
1610 result += sample->raw_size;
1611 }
1612
1613 if (type & PERF_SAMPLE_BRANCH_STACK) {
1614 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1615 sz += sizeof(u64);
1616 result += sz;
1617 }
1618
1619 if (type & PERF_SAMPLE_REGS_USER) {
1620 if (sample->user_regs.abi) {
1621 result += sizeof(u64);
1622 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1623 result += sz;
1624 } else {
1625 result += sizeof(u64);
1626 }
1627 }
1628
1629 if (type & PERF_SAMPLE_STACK_USER) {
1630 sz = sample->user_stack.size;
1631 result += sizeof(u64);
1632 if (sz) {
1633 result += sz;
1634 result += sizeof(u64);
1635 }
1636 }
1637
1638 if (type & PERF_SAMPLE_WEIGHT)
1639 result += sizeof(u64);
1640
1641 if (type & PERF_SAMPLE_DATA_SRC)
1642 result += sizeof(u64);
1643
1644 if (type & PERF_SAMPLE_TRANSACTION)
1645 result += sizeof(u64);
1646
1647 if (type & PERF_SAMPLE_REGS_INTR) {
1648 if (sample->intr_regs.abi) {
1649 result += sizeof(u64);
1650 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1651 result += sz;
1652 } else {
1653 result += sizeof(u64);
1654 }
1655 }
1656
1657 return result;
1658 }
1659
1660 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1661 u64 read_format,
1662 const struct perf_sample *sample,
1663 bool swapped)
1664 {
1665 u64 *array;
1666 size_t sz;
1667 /*
1668 * used for cross-endian analysis. See git commit 65014ab3
1669 * for why this goofiness is needed.
1670 */
1671 union u64_swap u;
1672
1673 array = event->sample.array;
1674
1675 if (type & PERF_SAMPLE_IDENTIFIER) {
1676 *array = sample->id;
1677 array++;
1678 }
1679
1680 if (type & PERF_SAMPLE_IP) {
1681 *array = sample->ip;
1682 array++;
1683 }
1684
1685 if (type & PERF_SAMPLE_TID) {
1686 u.val32[0] = sample->pid;
1687 u.val32[1] = sample->tid;
1688 if (swapped) {
1689 /*
1690 * Inverse of what is done in perf_evsel__parse_sample
1691 */
1692 u.val32[0] = bswap_32(u.val32[0]);
1693 u.val32[1] = bswap_32(u.val32[1]);
1694 u.val64 = bswap_64(u.val64);
1695 }
1696
1697 *array = u.val64;
1698 array++;
1699 }
1700
1701 if (type & PERF_SAMPLE_TIME) {
1702 *array = sample->time;
1703 array++;
1704 }
1705
1706 if (type & PERF_SAMPLE_ADDR) {
1707 *array = sample->addr;
1708 array++;
1709 }
1710
1711 if (type & PERF_SAMPLE_ID) {
1712 *array = sample->id;
1713 array++;
1714 }
1715
1716 if (type & PERF_SAMPLE_STREAM_ID) {
1717 *array = sample->stream_id;
1718 array++;
1719 }
1720
1721 if (type & PERF_SAMPLE_CPU) {
1722 u.val32[0] = sample->cpu;
1723 if (swapped) {
1724 /*
1725 * Inverse of what is done in perf_evsel__parse_sample
1726 */
1727 u.val32[0] = bswap_32(u.val32[0]);
1728 u.val64 = bswap_64(u.val64);
1729 }
1730 *array = u.val64;
1731 array++;
1732 }
1733
1734 if (type & PERF_SAMPLE_PERIOD) {
1735 *array = sample->period;
1736 array++;
1737 }
1738
1739 if (type & PERF_SAMPLE_READ) {
1740 if (read_format & PERF_FORMAT_GROUP)
1741 *array = sample->read.group.nr;
1742 else
1743 *array = sample->read.one.value;
1744 array++;
1745
1746 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1747 *array = sample->read.time_enabled;
1748 array++;
1749 }
1750
1751 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1752 *array = sample->read.time_running;
1753 array++;
1754 }
1755
1756 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1757 if (read_format & PERF_FORMAT_GROUP) {
1758 sz = sample->read.group.nr *
1759 sizeof(struct sample_read_value);
1760 memcpy(array, sample->read.group.values, sz);
1761 array = (void *)array + sz;
1762 } else {
1763 *array = sample->read.one.id;
1764 array++;
1765 }
1766 }
1767
1768 if (type & PERF_SAMPLE_CALLCHAIN) {
1769 sz = (sample->callchain->nr + 1) * sizeof(u64);
1770 memcpy(array, sample->callchain, sz);
1771 array = (void *)array + sz;
1772 }
1773
1774 if (type & PERF_SAMPLE_RAW) {
1775 u.val32[0] = sample->raw_size;
1776 if (WARN_ONCE(swapped,
1777 "Endianness of raw data not corrected!\n")) {
1778 /*
1779 * Inverse of what is done in perf_evsel__parse_sample
1780 */
1781 u.val32[0] = bswap_32(u.val32[0]);
1782 u.val32[1] = bswap_32(u.val32[1]);
1783 u.val64 = bswap_64(u.val64);
1784 }
1785 *array = u.val64;
1786 array = (void *)array + sizeof(u32);
1787
1788 memcpy(array, sample->raw_data, sample->raw_size);
1789 array = (void *)array + sample->raw_size;
1790 }
1791
1792 if (type & PERF_SAMPLE_BRANCH_STACK) {
1793 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1794 sz += sizeof(u64);
1795 memcpy(array, sample->branch_stack, sz);
1796 array = (void *)array + sz;
1797 }
1798
1799 if (type & PERF_SAMPLE_REGS_USER) {
1800 if (sample->user_regs.abi) {
1801 *array++ = sample->user_regs.abi;
1802 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1803 memcpy(array, sample->user_regs.regs, sz);
1804 array = (void *)array + sz;
1805 } else {
1806 *array++ = 0;
1807 }
1808 }
1809
1810 if (type & PERF_SAMPLE_STACK_USER) {
1811 sz = sample->user_stack.size;
1812 *array++ = sz;
1813 if (sz) {
1814 memcpy(array, sample->user_stack.data, sz);
1815 array = (void *)array + sz;
1816 *array++ = sz;
1817 }
1818 }
1819
1820 if (type & PERF_SAMPLE_WEIGHT) {
1821 *array = sample->weight;
1822 array++;
1823 }
1824
1825 if (type & PERF_SAMPLE_DATA_SRC) {
1826 *array = sample->data_src;
1827 array++;
1828 }
1829
1830 if (type & PERF_SAMPLE_TRANSACTION) {
1831 *array = sample->transaction;
1832 array++;
1833 }
1834
1835 if (type & PERF_SAMPLE_REGS_INTR) {
1836 if (sample->intr_regs.abi) {
1837 *array++ = sample->intr_regs.abi;
1838 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1839 memcpy(array, sample->intr_regs.regs, sz);
1840 array = (void *)array + sz;
1841 } else {
1842 *array++ = 0;
1843 }
1844 }
1845
1846 return 0;
1847 }
1848
1849 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
1850 {
1851 return pevent_find_field(evsel->tp_format, name);
1852 }
1853
1854 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
1855 const char *name)
1856 {
1857 struct format_field *field = perf_evsel__field(evsel, name);
1858 int offset;
1859
1860 if (!field)
1861 return NULL;
1862
1863 offset = field->offset;
1864
1865 if (field->flags & FIELD_IS_DYNAMIC) {
1866 offset = *(int *)(sample->raw_data + field->offset);
1867 offset &= 0xffff;
1868 }
1869
1870 return sample->raw_data + offset;
1871 }
1872
1873 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
1874 const char *name)
1875 {
1876 struct format_field *field = perf_evsel__field(evsel, name);
1877 void *ptr;
1878 u64 value;
1879
1880 if (!field)
1881 return 0;
1882
1883 ptr = sample->raw_data + field->offset;
1884
1885 switch (field->size) {
1886 case 1:
1887 return *(u8 *)ptr;
1888 case 2:
1889 value = *(u16 *)ptr;
1890 break;
1891 case 4:
1892 value = *(u32 *)ptr;
1893 break;
1894 case 8:
1895 value = *(u64 *)ptr;
1896 break;
1897 default:
1898 return 0;
1899 }
1900
1901 if (!evsel->needs_swap)
1902 return value;
1903
1904 switch (field->size) {
1905 case 2:
1906 return bswap_16(value);
1907 case 4:
1908 return bswap_32(value);
1909 case 8:
1910 return bswap_64(value);
1911 default:
1912 return 0;
1913 }
1914
1915 return 0;
1916 }
1917
1918 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
1919 {
1920 va_list args;
1921 int ret = 0;
1922
1923 if (!*first) {
1924 ret += fprintf(fp, ",");
1925 } else {
1926 ret += fprintf(fp, ":");
1927 *first = false;
1928 }
1929
1930 va_start(args, fmt);
1931 ret += vfprintf(fp, fmt, args);
1932 va_end(args);
1933 return ret;
1934 }
1935
1936 static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
1937 {
1938 if (value == 0)
1939 return 0;
1940
1941 return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
1942 }
1943
1944 #define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
1945
1946 struct bit_names {
1947 int bit;
1948 const char *name;
1949 };
1950
1951 static int bits__fprintf(FILE *fp, const char *field, u64 value,
1952 struct bit_names *bits, bool *first)
1953 {
1954 int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
1955 bool first_bit = true;
1956
1957 do {
1958 if (value & bits[i].bit) {
1959 printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
1960 first_bit = false;
1961 }
1962 } while (bits[++i].name != NULL);
1963
1964 return printed;
1965 }
1966
1967 static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
1968 {
1969 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1970 struct bit_names bits[] = {
1971 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1972 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1973 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1974 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1975 bit_name(IDENTIFIER), bit_name(REGS_INTR),
1976 { .name = NULL, }
1977 };
1978 #undef bit_name
1979 return bits__fprintf(fp, "sample_type", value, bits, first);
1980 }
1981
1982 static int read_format__fprintf(FILE *fp, bool *first, u64 value)
1983 {
1984 #define bit_name(n) { PERF_FORMAT_##n, #n }
1985 struct bit_names bits[] = {
1986 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1987 bit_name(ID), bit_name(GROUP),
1988 { .name = NULL, }
1989 };
1990 #undef bit_name
1991 return bits__fprintf(fp, "read_format", value, bits, first);
1992 }
1993
1994 int perf_evsel__fprintf(struct perf_evsel *evsel,
1995 struct perf_attr_details *details, FILE *fp)
1996 {
1997 bool first = true;
1998 int printed = 0;
1999
2000 if (details->event_group) {
2001 struct perf_evsel *pos;
2002
2003 if (!perf_evsel__is_group_leader(evsel))
2004 return 0;
2005
2006 if (evsel->nr_members > 1)
2007 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2008
2009 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2010 for_each_group_member(pos, evsel)
2011 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2012
2013 if (evsel->nr_members > 1)
2014 printed += fprintf(fp, "}");
2015 goto out;
2016 }
2017
2018 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2019
2020 if (details->verbose || details->freq) {
2021 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
2022 (u64)evsel->attr.sample_freq);
2023 }
2024
2025 if (details->verbose) {
2026 if_print(type);
2027 if_print(config);
2028 if_print(config1);
2029 if_print(config2);
2030 if_print(size);
2031 printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
2032 if (evsel->attr.read_format)
2033 printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
2034 if_print(disabled);
2035 if_print(inherit);
2036 if_print(pinned);
2037 if_print(exclusive);
2038 if_print(exclude_user);
2039 if_print(exclude_kernel);
2040 if_print(exclude_hv);
2041 if_print(exclude_idle);
2042 if_print(mmap);
2043 if_print(mmap2);
2044 if_print(comm);
2045 if_print(comm_exec);
2046 if_print(freq);
2047 if_print(inherit_stat);
2048 if_print(enable_on_exec);
2049 if_print(task);
2050 if_print(watermark);
2051 if_print(precise_ip);
2052 if_print(mmap_data);
2053 if_print(sample_id_all);
2054 if_print(exclude_host);
2055 if_print(exclude_guest);
2056 if_print(__reserved_1);
2057 if_print(wakeup_events);
2058 if_print(bp_type);
2059 if_print(branch_sample_type);
2060 }
2061 out:
2062 fputc('\n', fp);
2063 return ++printed;
2064 }
2065
2066 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2067 char *msg, size_t msgsize)
2068 {
2069 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2070 evsel->attr.type == PERF_TYPE_HARDWARE &&
2071 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2072 /*
2073 * If it's cycles then fall back to hrtimer based
2074 * cpu-clock-tick sw counter, which is always available even if
2075 * no PMU support.
2076 *
2077 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2078 * b0a873e).
2079 */
2080 scnprintf(msg, msgsize, "%s",
2081 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2082
2083 evsel->attr.type = PERF_TYPE_SOFTWARE;
2084 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2085
2086 zfree(&evsel->name);
2087 return true;
2088 }
2089
2090 return false;
2091 }
2092
2093 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2094 int err, char *msg, size_t size)
2095 {
2096 char sbuf[STRERR_BUFSIZE];
2097
2098 switch (err) {
2099 case EPERM:
2100 case EACCES:
2101 return scnprintf(msg, size,
2102 "You may not have permission to collect %sstats.\n"
2103 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
2104 " -1 - Not paranoid at all\n"
2105 " 0 - Disallow raw tracepoint access for unpriv\n"
2106 " 1 - Disallow cpu events for unpriv\n"
2107 " 2 - Disallow kernel profiling for unpriv",
2108 target->system_wide ? "system-wide " : "");
2109 case ENOENT:
2110 return scnprintf(msg, size, "The %s event is not supported.",
2111 perf_evsel__name(evsel));
2112 case EMFILE:
2113 return scnprintf(msg, size, "%s",
2114 "Too many events are opened.\n"
2115 "Try again after reducing the number of events.");
2116 case ENODEV:
2117 if (target->cpu_list)
2118 return scnprintf(msg, size, "%s",
2119 "No such device - did you specify an out-of-range profile CPU?\n");
2120 break;
2121 case EOPNOTSUPP:
2122 if (evsel->attr.precise_ip)
2123 return scnprintf(msg, size, "%s",
2124 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2125 #if defined(__i386__) || defined(__x86_64__)
2126 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2127 return scnprintf(msg, size, "%s",
2128 "No hardware sampling interrupt available.\n"
2129 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2130 #endif
2131 break;
2132 case EBUSY:
2133 if (find_process("oprofiled"))
2134 return scnprintf(msg, size,
2135 "The PMU counters are busy/taken by another profiler.\n"
2136 "We found oprofile daemon running, please stop it and try again.");
2137 break;
2138 default:
2139 break;
2140 }
2141
2142 return scnprintf(msg, size,
2143 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2144 "/bin/dmesg may provide additional information.\n"
2145 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2146 err, strerror_r(err, sbuf, sizeof(sbuf)),
2147 perf_evsel__name(evsel));
2148 }
(deprecated) Btrfs devel tree