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perf evlist: Pass the event_group info via perf_attr_details
[linux-2.6/btrfs-unstable.git] / tools / perf / util / evsel.c
blob9c82f98f26dedd460fb5b2c70fcb8256c33fca42
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 "asm/bug.h"
13 #include "debugfs.h"
14 #include "event-parse.h"
15 #include "evsel.h"
16 #include "evlist.h"
17 #include "util.h"
18 #include "cpumap.h"
19 #include "thread_map.h"
20 #include "target.h"
21 #include <linux/hw_breakpoint.h>
22 #include <linux/perf_event.h>
23 #include "perf_regs.h"
24
25 static struct {
26 bool sample_id_all;
27 bool exclude_guest;
28 } perf_missing_features;
29
30 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
31
32 static int __perf_evsel__sample_size(u64 sample_type)
33 {
34 u64 mask = sample_type & PERF_SAMPLE_MASK;
35 int size = 0;
36 int i;
37
38 for (i = 0; i < 64; i++) {
39 if (mask & (1ULL << i))
40 size++;
41 }
42
43 size *= sizeof(u64);
44
45 return size;
46 }
47
48 void hists__init(struct hists *hists)
49 {
50 memset(hists, 0, sizeof(*hists));
51 hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
52 hists->entries_in = &hists->entries_in_array[0];
53 hists->entries_collapsed = RB_ROOT;
54 hists->entries = RB_ROOT;
55 pthread_mutex_init(&hists->lock, NULL);
56 }
57
58 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
59 enum perf_event_sample_format bit)
60 {
61 if (!(evsel->attr.sample_type & bit)) {
62 evsel->attr.sample_type |= bit;
63 evsel->sample_size += sizeof(u64);
64 }
65 }
66
67 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
68 enum perf_event_sample_format bit)
69 {
70 if (evsel->attr.sample_type & bit) {
71 evsel->attr.sample_type &= ~bit;
72 evsel->sample_size -= sizeof(u64);
73 }
74 }
75
76 void perf_evsel__set_sample_id(struct perf_evsel *evsel)
77 {
78 perf_evsel__set_sample_bit(evsel, ID);
79 evsel->attr.read_format |= PERF_FORMAT_ID;
80 }
81
82 void perf_evsel__init(struct perf_evsel *evsel,
83 struct perf_event_attr *attr, int idx)
84 {
85 evsel->idx = idx;
86 evsel->attr = *attr;
87 evsel->leader = evsel;
88 INIT_LIST_HEAD(&evsel->node);
89 hists__init(&evsel->hists);
90 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
91 }
92
93 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
94 {
95 struct perf_evsel *evsel = zalloc(sizeof(*evsel));
96
97 if (evsel != NULL)
98 perf_evsel__init(evsel, attr, idx);
99
100 return evsel;
101 }
102
103 struct event_format *event_format__new(const char *sys, const char *name)
104 {
105 int fd, n;
106 char *filename;
107 void *bf = NULL, *nbf;
108 size_t size = 0, alloc_size = 0;
109 struct event_format *format = NULL;
110
111 if (asprintf(&filename, "%s/%s/%s/format", tracing_events_path, sys, name) < 0)
112 goto out;
113
114 fd = open(filename, O_RDONLY);
115 if (fd < 0)
116 goto out_free_filename;
117
118 do {
119 if (size == alloc_size) {
120 alloc_size += BUFSIZ;
121 nbf = realloc(bf, alloc_size);
122 if (nbf == NULL)
123 goto out_free_bf;
124 bf = nbf;
125 }
126
127 n = read(fd, bf + size, BUFSIZ);
128 if (n < 0)
129 goto out_free_bf;
130 size += n;
131 } while (n > 0);
132
133 pevent_parse_format(&format, bf, size, sys);
134
135 out_free_bf:
136 free(bf);
137 close(fd);
138 out_free_filename:
139 free(filename);
140 out:
141 return format;
142 }
143
144 struct perf_evsel *perf_evsel__newtp(const char *sys, const char *name, int idx)
145 {
146 struct perf_evsel *evsel = zalloc(sizeof(*evsel));
147
148 if (evsel != NULL) {
149 struct perf_event_attr attr = {
150 .type = PERF_TYPE_TRACEPOINT,
151 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
152 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
153 };
154
155 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
156 goto out_free;
157
158 evsel->tp_format = event_format__new(sys, name);
159 if (evsel->tp_format == NULL)
160 goto out_free;
161
162 event_attr_init(&attr);
163 attr.config = evsel->tp_format->id;
164 attr.sample_period = 1;
165 perf_evsel__init(evsel, &attr, idx);
166 }
167
168 return evsel;
169
170 out_free:
171 free(evsel->name);
172 free(evsel);
173 return NULL;
174 }
175
176 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
177 "cycles",
178 "instructions",
179 "cache-references",
180 "cache-misses",
181 "branches",
182 "branch-misses",
183 "bus-cycles",
184 "stalled-cycles-frontend",
185 "stalled-cycles-backend",
186 "ref-cycles",
187 };
188
189 static const char *__perf_evsel__hw_name(u64 config)
190 {
191 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
192 return perf_evsel__hw_names[config];
193
194 return "unknown-hardware";
195 }
196
197 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
198 {
199 int colon = 0, r = 0;
200 struct perf_event_attr *attr = &evsel->attr;
201 bool exclude_guest_default = false;
202
203 #define MOD_PRINT(context, mod) do { \
204 if (!attr->exclude_##context) { \
205 if (!colon) colon = ++r; \
206 r += scnprintf(bf + r, size - r, "%c", mod); \
207 } } while(0)
208
209 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
210 MOD_PRINT(kernel, 'k');
211 MOD_PRINT(user, 'u');
212 MOD_PRINT(hv, 'h');
213 exclude_guest_default = true;
214 }
215
216 if (attr->precise_ip) {
217 if (!colon)
218 colon = ++r;
219 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
220 exclude_guest_default = true;
221 }
222
223 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
224 MOD_PRINT(host, 'H');
225 MOD_PRINT(guest, 'G');
226 }
227 #undef MOD_PRINT
228 if (colon)
229 bf[colon - 1] = ':';
230 return r;
231 }
232
233 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
234 {
235 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
236 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
237 }
238
239 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
240 "cpu-clock",
241 "task-clock",
242 "page-faults",
243 "context-switches",
244 "cpu-migrations",
245 "minor-faults",
246 "major-faults",
247 "alignment-faults",
248 "emulation-faults",
249 };
250
251 static const char *__perf_evsel__sw_name(u64 config)
252 {
253 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
254 return perf_evsel__sw_names[config];
255 return "unknown-software";
256 }
257
258 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
259 {
260 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
261 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
262 }
263
264 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
265 {
266 int r;
267
268 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
269
270 if (type & HW_BREAKPOINT_R)
271 r += scnprintf(bf + r, size - r, "r");
272
273 if (type & HW_BREAKPOINT_W)
274 r += scnprintf(bf + r, size - r, "w");
275
276 if (type & HW_BREAKPOINT_X)
277 r += scnprintf(bf + r, size - r, "x");
278
279 return r;
280 }
281
282 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
283 {
284 struct perf_event_attr *attr = &evsel->attr;
285 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
286 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
287 }
288
289 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
290 [PERF_EVSEL__MAX_ALIASES] = {
291 { "L1-dcache", "l1-d", "l1d", "L1-data", },
292 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
293 { "LLC", "L2", },
294 { "dTLB", "d-tlb", "Data-TLB", },
295 { "iTLB", "i-tlb", "Instruction-TLB", },
296 { "branch", "branches", "bpu", "btb", "bpc", },
297 { "node", },
298 };
299
300 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
301 [PERF_EVSEL__MAX_ALIASES] = {
302 { "load", "loads", "read", },
303 { "store", "stores", "write", },
304 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
305 };
306
307 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
308 [PERF_EVSEL__MAX_ALIASES] = {
309 { "refs", "Reference", "ops", "access", },
310 { "misses", "miss", },
311 };
312
313 #define C(x) PERF_COUNT_HW_CACHE_##x
314 #define CACHE_READ (1 << C(OP_READ))
315 #define CACHE_WRITE (1 << C(OP_WRITE))
316 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
317 #define COP(x) (1 << x)
318
319 /*
320 * cache operartion stat
321 * L1I : Read and prefetch only
322 * ITLB and BPU : Read-only
323 */
324 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
325 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
326 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
327 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
328 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
329 [C(ITLB)] = (CACHE_READ),
330 [C(BPU)] = (CACHE_READ),
331 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
332 };
333
334 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
335 {
336 if (perf_evsel__hw_cache_stat[type] & COP(op))
337 return true; /* valid */
338 else
339 return false; /* invalid */
340 }
341
342 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
343 char *bf, size_t size)
344 {
345 if (result) {
346 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
347 perf_evsel__hw_cache_op[op][0],
348 perf_evsel__hw_cache_result[result][0]);
349 }
350
351 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
352 perf_evsel__hw_cache_op[op][1]);
353 }
354
355 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
356 {
357 u8 op, result, type = (config >> 0) & 0xff;
358 const char *err = "unknown-ext-hardware-cache-type";
359
360 if (type > PERF_COUNT_HW_CACHE_MAX)
361 goto out_err;
362
363 op = (config >> 8) & 0xff;
364 err = "unknown-ext-hardware-cache-op";
365 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
366 goto out_err;
367
368 result = (config >> 16) & 0xff;
369 err = "unknown-ext-hardware-cache-result";
370 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
371 goto out_err;
372
373 err = "invalid-cache";
374 if (!perf_evsel__is_cache_op_valid(type, op))
375 goto out_err;
376
377 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
378 out_err:
379 return scnprintf(bf, size, "%s", err);
380 }
381
382 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
383 {
384 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
385 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
386 }
387
388 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
389 {
390 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
391 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
392 }
393
394 const char *perf_evsel__name(struct perf_evsel *evsel)
395 {
396 char bf[128];
397
398 if (evsel->name)
399 return evsel->name;
400
401 switch (evsel->attr.type) {
402 case PERF_TYPE_RAW:
403 perf_evsel__raw_name(evsel, bf, sizeof(bf));
404 break;
405
406 case PERF_TYPE_HARDWARE:
407 perf_evsel__hw_name(evsel, bf, sizeof(bf));
408 break;
409
410 case PERF_TYPE_HW_CACHE:
411 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
412 break;
413
414 case PERF_TYPE_SOFTWARE:
415 perf_evsel__sw_name(evsel, bf, sizeof(bf));
416 break;
417
418 case PERF_TYPE_TRACEPOINT:
419 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
420 break;
421
422 case PERF_TYPE_BREAKPOINT:
423 perf_evsel__bp_name(evsel, bf, sizeof(bf));
424 break;
425
426 default:
427 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
428 evsel->attr.type);
429 break;
430 }
431
432 evsel->name = strdup(bf);
433
434 return evsel->name ?: "unknown";
435 }
436
437 const char *perf_evsel__group_name(struct perf_evsel *evsel)
438 {
439 return evsel->group_name ?: "anon group";
440 }
441
442 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
443 {
444 int ret;
445 struct perf_evsel *pos;
446 const char *group_name = perf_evsel__group_name(evsel);
447
448 ret = scnprintf(buf, size, "%s", group_name);
449
450 ret += scnprintf(buf + ret, size - ret, " { %s",
451 perf_evsel__name(evsel));
452
453 for_each_group_member(pos, evsel)
454 ret += scnprintf(buf + ret, size - ret, ", %s",
455 perf_evsel__name(pos));
456
457 ret += scnprintf(buf + ret, size - ret, " }");
458
459 return ret;
460 }
461
462 /*
463 * The enable_on_exec/disabled value strategy:
464 *
465 * 1) For any type of traced program:
466 * - all independent events and group leaders are disabled
467 * - all group members are enabled
468 *
469 * Group members are ruled by group leaders. They need to
470 * be enabled, because the group scheduling relies on that.
471 *
472 * 2) For traced programs executed by perf:
473 * - all independent events and group leaders have
474 * enable_on_exec set
475 * - we don't specifically enable or disable any event during
476 * the record command
477 *
478 * Independent events and group leaders are initially disabled
479 * and get enabled by exec. Group members are ruled by group
480 * leaders as stated in 1).
481 *
482 * 3) For traced programs attached by perf (pid/tid):
483 * - we specifically enable or disable all events during
484 * the record command
485 *
486 * When attaching events to already running traced we
487 * enable/disable events specifically, as there's no
488 * initial traced exec call.
489 */
490 void perf_evsel__config(struct perf_evsel *evsel,
491 struct perf_record_opts *opts)
492 {
493 struct perf_event_attr *attr = &evsel->attr;
494 int track = !evsel->idx; /* only the first counter needs these */
495
496 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
497 attr->inherit = !opts->no_inherit;
498
499 perf_evsel__set_sample_bit(evsel, IP);
500 perf_evsel__set_sample_bit(evsel, TID);
501
502 /*
503 * We default some events to a 1 default interval. But keep
504 * it a weak assumption overridable by the user.
505 */
506 if (!attr->sample_period || (opts->user_freq != UINT_MAX &&
507 opts->user_interval != ULLONG_MAX)) {
508 if (opts->freq) {
509 perf_evsel__set_sample_bit(evsel, PERIOD);
510 attr->freq = 1;
511 attr->sample_freq = opts->freq;
512 } else {
513 attr->sample_period = opts->default_interval;
514 }
515 }
516
517 if (opts->no_samples)
518 attr->sample_freq = 0;
519
520 if (opts->inherit_stat)
521 attr->inherit_stat = 1;
522
523 if (opts->sample_address) {
524 perf_evsel__set_sample_bit(evsel, ADDR);
525 attr->mmap_data = track;
526 }
527
528 if (opts->call_graph) {
529 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
530
531 if (opts->call_graph == CALLCHAIN_DWARF) {
532 perf_evsel__set_sample_bit(evsel, REGS_USER);
533 perf_evsel__set_sample_bit(evsel, STACK_USER);
534 attr->sample_regs_user = PERF_REGS_MASK;
535 attr->sample_stack_user = opts->stack_dump_size;
536 attr->exclude_callchain_user = 1;
537 }
538 }
539
540 if (perf_target__has_cpu(&opts->target))
541 perf_evsel__set_sample_bit(evsel, CPU);
542
543 if (opts->period)
544 perf_evsel__set_sample_bit(evsel, PERIOD);
545
546 if (!perf_missing_features.sample_id_all &&
547 (opts->sample_time || !opts->no_inherit ||
548 perf_target__has_cpu(&opts->target)))
549 perf_evsel__set_sample_bit(evsel, TIME);
550
551 if (opts->raw_samples) {
552 perf_evsel__set_sample_bit(evsel, TIME);
553 perf_evsel__set_sample_bit(evsel, RAW);
554 perf_evsel__set_sample_bit(evsel, CPU);
555 }
556
557 if (opts->no_delay) {
558 attr->watermark = 0;
559 attr->wakeup_events = 1;
560 }
561 if (opts->branch_stack) {
562 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
563 attr->branch_sample_type = opts->branch_stack;
564 }
565
566 attr->mmap = track;
567 attr->comm = track;
568
569 /*
570 * XXX see the function comment above
571 *
572 * Disabling only independent events or group leaders,
573 * keeping group members enabled.
574 */
575 if (perf_evsel__is_group_leader(evsel))
576 attr->disabled = 1;
577
578 /*
579 * Setting enable_on_exec for independent events and
580 * group leaders for traced executed by perf.
581 */
582 if (perf_target__none(&opts->target) && perf_evsel__is_group_leader(evsel))
583 attr->enable_on_exec = 1;
584 }
585
586 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
587 {
588 int cpu, thread;
589 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
590
591 if (evsel->fd) {
592 for (cpu = 0; cpu < ncpus; cpu++) {
593 for (thread = 0; thread < nthreads; thread++) {
594 FD(evsel, cpu, thread) = -1;
595 }
596 }
597 }
598
599 return evsel->fd != NULL ? 0 : -ENOMEM;
600 }
601
602 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
603 const char *filter)
604 {
605 int cpu, thread;
606
607 for (cpu = 0; cpu < ncpus; cpu++) {
608 for (thread = 0; thread < nthreads; thread++) {
609 int fd = FD(evsel, cpu, thread),
610 err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
611
612 if (err)
613 return err;
614 }
615 }
616
617 return 0;
618 }
619
620 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
621 {
622 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
623 if (evsel->sample_id == NULL)
624 return -ENOMEM;
625
626 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
627 if (evsel->id == NULL) {
628 xyarray__delete(evsel->sample_id);
629 evsel->sample_id = NULL;
630 return -ENOMEM;
631 }
632
633 return 0;
634 }
635
636 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
637 {
638 evsel->counts = zalloc((sizeof(*evsel->counts) +
639 (ncpus * sizeof(struct perf_counts_values))));
640 return evsel->counts != NULL ? 0 : -ENOMEM;
641 }
642
643 void perf_evsel__free_fd(struct perf_evsel *evsel)
644 {
645 xyarray__delete(evsel->fd);
646 evsel->fd = NULL;
647 }
648
649 void perf_evsel__free_id(struct perf_evsel *evsel)
650 {
651 xyarray__delete(evsel->sample_id);
652 evsel->sample_id = NULL;
653 free(evsel->id);
654 evsel->id = NULL;
655 }
656
657 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
658 {
659 int cpu, thread;
660
661 for (cpu = 0; cpu < ncpus; cpu++)
662 for (thread = 0; thread < nthreads; ++thread) {
663 close(FD(evsel, cpu, thread));
664 FD(evsel, cpu, thread) = -1;
665 }
666 }
667
668 void perf_evsel__free_counts(struct perf_evsel *evsel)
669 {
670 free(evsel->counts);
671 }
672
673 void perf_evsel__exit(struct perf_evsel *evsel)
674 {
675 assert(list_empty(&evsel->node));
676 xyarray__delete(evsel->fd);
677 xyarray__delete(evsel->sample_id);
678 free(evsel->id);
679 }
680
681 void perf_evsel__delete(struct perf_evsel *evsel)
682 {
683 perf_evsel__exit(evsel);
684 close_cgroup(evsel->cgrp);
685 free(evsel->group_name);
686 if (evsel->tp_format)
687 pevent_free_format(evsel->tp_format);
688 free(evsel->name);
689 free(evsel);
690 }
691
692 static inline void compute_deltas(struct perf_evsel *evsel,
693 int cpu,
694 struct perf_counts_values *count)
695 {
696 struct perf_counts_values tmp;
697
698 if (!evsel->prev_raw_counts)
699 return;
700
701 if (cpu == -1) {
702 tmp = evsel->prev_raw_counts->aggr;
703 evsel->prev_raw_counts->aggr = *count;
704 } else {
705 tmp = evsel->prev_raw_counts->cpu[cpu];
706 evsel->prev_raw_counts->cpu[cpu] = *count;
707 }
708
709 count->val = count->val - tmp.val;
710 count->ena = count->ena - tmp.ena;
711 count->run = count->run - tmp.run;
712 }
713
714 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
715 int cpu, int thread, bool scale)
716 {
717 struct perf_counts_values count;
718 size_t nv = scale ? 3 : 1;
719
720 if (FD(evsel, cpu, thread) < 0)
721 return -EINVAL;
722
723 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
724 return -ENOMEM;
725
726 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
727 return -errno;
728
729 compute_deltas(evsel, cpu, &count);
730
731 if (scale) {
732 if (count.run == 0)
733 count.val = 0;
734 else if (count.run < count.ena)
735 count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
736 } else
737 count.ena = count.run = 0;
738
739 evsel->counts->cpu[cpu] = count;
740 return 0;
741 }
742
743 int __perf_evsel__read(struct perf_evsel *evsel,
744 int ncpus, int nthreads, bool scale)
745 {
746 size_t nv = scale ? 3 : 1;
747 int cpu, thread;
748 struct perf_counts_values *aggr = &evsel->counts->aggr, count;
749
750 aggr->val = aggr->ena = aggr->run = 0;
751
752 for (cpu = 0; cpu < ncpus; cpu++) {
753 for (thread = 0; thread < nthreads; thread++) {
754 if (FD(evsel, cpu, thread) < 0)
755 continue;
756
757 if (readn(FD(evsel, cpu, thread),
758 &count, nv * sizeof(u64)) < 0)
759 return -errno;
760
761 aggr->val += count.val;
762 if (scale) {
763 aggr->ena += count.ena;
764 aggr->run += count.run;
765 }
766 }
767 }
768
769 compute_deltas(evsel, -1, aggr);
770
771 evsel->counts->scaled = 0;
772 if (scale) {
773 if (aggr->run == 0) {
774 evsel->counts->scaled = -1;
775 aggr->val = 0;
776 return 0;
777 }
778
779 if (aggr->run < aggr->ena) {
780 evsel->counts->scaled = 1;
781 aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
782 }
783 } else
784 aggr->ena = aggr->run = 0;
785
786 return 0;
787 }
788
789 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
790 {
791 struct perf_evsel *leader = evsel->leader;
792 int fd;
793
794 if (perf_evsel__is_group_leader(evsel))
795 return -1;
796
797 /*
798 * Leader must be already processed/open,
799 * if not it's a bug.
800 */
801 BUG_ON(!leader->fd);
802
803 fd = FD(leader, cpu, thread);
804 BUG_ON(fd == -1);
805
806 return fd;
807 }
808
809 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
810 struct thread_map *threads)
811 {
812 int cpu, thread;
813 unsigned long flags = 0;
814 int pid = -1, err;
815
816 if (evsel->fd == NULL &&
817 perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
818 return -ENOMEM;
819
820 if (evsel->cgrp) {
821 flags = PERF_FLAG_PID_CGROUP;
822 pid = evsel->cgrp->fd;
823 }
824
825 fallback_missing_features:
826 if (perf_missing_features.exclude_guest)
827 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
828 retry_sample_id:
829 if (perf_missing_features.sample_id_all)
830 evsel->attr.sample_id_all = 0;
831
832 for (cpu = 0; cpu < cpus->nr; cpu++) {
833
834 for (thread = 0; thread < threads->nr; thread++) {
835 int group_fd;
836
837 if (!evsel->cgrp)
838 pid = threads->map[thread];
839
840 group_fd = get_group_fd(evsel, cpu, thread);
841
842 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
843 pid,
844 cpus->map[cpu],
845 group_fd, flags);
846 if (FD(evsel, cpu, thread) < 0) {
847 err = -errno;
848 goto try_fallback;
849 }
850 }
851 }
852
853 return 0;
854
855 try_fallback:
856 if (err != -EINVAL || cpu > 0 || thread > 0)
857 goto out_close;
858
859 if (!perf_missing_features.exclude_guest &&
860 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
861 perf_missing_features.exclude_guest = true;
862 goto fallback_missing_features;
863 } else if (!perf_missing_features.sample_id_all) {
864 perf_missing_features.sample_id_all = true;
865 goto retry_sample_id;
866 }
867
868 out_close:
869 do {
870 while (--thread >= 0) {
871 close(FD(evsel, cpu, thread));
872 FD(evsel, cpu, thread) = -1;
873 }
874 thread = threads->nr;
875 } while (--cpu >= 0);
876 return err;
877 }
878
879 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
880 {
881 if (evsel->fd == NULL)
882 return;
883
884 perf_evsel__close_fd(evsel, ncpus, nthreads);
885 perf_evsel__free_fd(evsel);
886 evsel->fd = NULL;
887 }
888
889 static struct {
890 struct cpu_map map;
891 int cpus[1];
892 } empty_cpu_map = {
893 .map.nr = 1,
894 .cpus = { -1, },
895 };
896
897 static struct {
898 struct thread_map map;
899 int threads[1];
900 } empty_thread_map = {
901 .map.nr = 1,
902 .threads = { -1, },
903 };
904
905 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
906 struct thread_map *threads)
907 {
908 if (cpus == NULL) {
909 /* Work around old compiler warnings about strict aliasing */
910 cpus = &empty_cpu_map.map;
911 }
912
913 if (threads == NULL)
914 threads = &empty_thread_map.map;
915
916 return __perf_evsel__open(evsel, cpus, threads);
917 }
918
919 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
920 struct cpu_map *cpus)
921 {
922 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
923 }
924
925 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
926 struct thread_map *threads)
927 {
928 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
929 }
930
931 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
932 const union perf_event *event,
933 struct perf_sample *sample)
934 {
935 u64 type = evsel->attr.sample_type;
936 const u64 *array = event->sample.array;
937 bool swapped = evsel->needs_swap;
938 union u64_swap u;
939
940 array += ((event->header.size -
941 sizeof(event->header)) / sizeof(u64)) - 1;
942
943 if (type & PERF_SAMPLE_CPU) {
944 u.val64 = *array;
945 if (swapped) {
946 /* undo swap of u64, then swap on individual u32s */
947 u.val64 = bswap_64(u.val64);
948 u.val32[0] = bswap_32(u.val32[0]);
949 }
950
951 sample->cpu = u.val32[0];
952 array--;
953 }
954
955 if (type & PERF_SAMPLE_STREAM_ID) {
956 sample->stream_id = *array;
957 array--;
958 }
959
960 if (type & PERF_SAMPLE_ID) {
961 sample->id = *array;
962 array--;
963 }
964
965 if (type & PERF_SAMPLE_TIME) {
966 sample->time = *array;
967 array--;
968 }
969
970 if (type & PERF_SAMPLE_TID) {
971 u.val64 = *array;
972 if (swapped) {
973 /* undo swap of u64, then swap on individual u32s */
974 u.val64 = bswap_64(u.val64);
975 u.val32[0] = bswap_32(u.val32[0]);
976 u.val32[1] = bswap_32(u.val32[1]);
977 }
978
979 sample->pid = u.val32[0];
980 sample->tid = u.val32[1];
981 }
982
983 return 0;
984 }
985
986 static bool sample_overlap(const union perf_event *event,
987 const void *offset, u64 size)
988 {
989 const void *base = event;
990
991 if (offset + size > base + event->header.size)
992 return true;
993
994 return false;
995 }
996
997 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
998 struct perf_sample *data)
999 {
1000 u64 type = evsel->attr.sample_type;
1001 u64 regs_user = evsel->attr.sample_regs_user;
1002 bool swapped = evsel->needs_swap;
1003 const u64 *array;
1004
1005 /*
1006 * used for cross-endian analysis. See git commit 65014ab3
1007 * for why this goofiness is needed.
1008 */
1009 union u64_swap u;
1010
1011 memset(data, 0, sizeof(*data));
1012 data->cpu = data->pid = data->tid = -1;
1013 data->stream_id = data->id = data->time = -1ULL;
1014 data->period = 1;
1015
1016 if (event->header.type != PERF_RECORD_SAMPLE) {
1017 if (!evsel->attr.sample_id_all)
1018 return 0;
1019 return perf_evsel__parse_id_sample(evsel, event, data);
1020 }
1021
1022 array = event->sample.array;
1023
1024 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1025 return -EFAULT;
1026
1027 if (type & PERF_SAMPLE_IP) {
1028 data->ip = event->ip.ip;
1029 array++;
1030 }
1031
1032 if (type & PERF_SAMPLE_TID) {
1033 u.val64 = *array;
1034 if (swapped) {
1035 /* undo swap of u64, then swap on individual u32s */
1036 u.val64 = bswap_64(u.val64);
1037 u.val32[0] = bswap_32(u.val32[0]);
1038 u.val32[1] = bswap_32(u.val32[1]);
1039 }
1040
1041 data->pid = u.val32[0];
1042 data->tid = u.val32[1];
1043 array++;
1044 }
1045
1046 if (type & PERF_SAMPLE_TIME) {
1047 data->time = *array;
1048 array++;
1049 }
1050
1051 data->addr = 0;
1052 if (type & PERF_SAMPLE_ADDR) {
1053 data->addr = *array;
1054 array++;
1055 }
1056
1057 data->id = -1ULL;
1058 if (type & PERF_SAMPLE_ID) {
1059 data->id = *array;
1060 array++;
1061 }
1062
1063 if (type & PERF_SAMPLE_STREAM_ID) {
1064 data->stream_id = *array;
1065 array++;
1066 }
1067
1068 if (type & PERF_SAMPLE_CPU) {
1069
1070 u.val64 = *array;
1071 if (swapped) {
1072 /* undo swap of u64, then swap on individual u32s */
1073 u.val64 = bswap_64(u.val64);
1074 u.val32[0] = bswap_32(u.val32[0]);
1075 }
1076
1077 data->cpu = u.val32[0];
1078 array++;
1079 }
1080
1081 if (type & PERF_SAMPLE_PERIOD) {
1082 data->period = *array;
1083 array++;
1084 }
1085
1086 if (type & PERF_SAMPLE_READ) {
1087 fprintf(stderr, "PERF_SAMPLE_READ is unsupported for now\n");
1088 return -1;
1089 }
1090
1091 if (type & PERF_SAMPLE_CALLCHAIN) {
1092 if (sample_overlap(event, array, sizeof(data->callchain->nr)))
1093 return -EFAULT;
1094
1095 data->callchain = (struct ip_callchain *)array;
1096
1097 if (sample_overlap(event, array, data->callchain->nr))
1098 return -EFAULT;
1099
1100 array += 1 + data->callchain->nr;
1101 }
1102
1103 if (type & PERF_SAMPLE_RAW) {
1104 const u64 *pdata;
1105
1106 u.val64 = *array;
1107 if (WARN_ONCE(swapped,
1108 "Endianness of raw data not corrected!\n")) {
1109 /* undo swap of u64, then swap on individual u32s */
1110 u.val64 = bswap_64(u.val64);
1111 u.val32[0] = bswap_32(u.val32[0]);
1112 u.val32[1] = bswap_32(u.val32[1]);
1113 }
1114
1115 if (sample_overlap(event, array, sizeof(u32)))
1116 return -EFAULT;
1117
1118 data->raw_size = u.val32[0];
1119 pdata = (void *) array + sizeof(u32);
1120
1121 if (sample_overlap(event, pdata, data->raw_size))
1122 return -EFAULT;
1123
1124 data->raw_data = (void *) pdata;
1125
1126 array = (void *)array + data->raw_size + sizeof(u32);
1127 }
1128
1129 if (type & PERF_SAMPLE_BRANCH_STACK) {
1130 u64 sz;
1131
1132 data->branch_stack = (struct branch_stack *)array;
1133 array++; /* nr */
1134
1135 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1136 sz /= sizeof(u64);
1137 array += sz;
1138 }
1139
1140 if (type & PERF_SAMPLE_REGS_USER) {
1141 /* First u64 tells us if we have any regs in sample. */
1142 u64 avail = *array++;
1143
1144 if (avail) {
1145 data->user_regs.regs = (u64 *)array;
1146 array += hweight_long(regs_user);
1147 }
1148 }
1149
1150 if (type & PERF_SAMPLE_STACK_USER) {
1151 u64 size = *array++;
1152
1153 data->user_stack.offset = ((char *)(array - 1)
1154 - (char *) event);
1155
1156 if (!size) {
1157 data->user_stack.size = 0;
1158 } else {
1159 data->user_stack.data = (char *)array;
1160 array += size / sizeof(*array);
1161 data->user_stack.size = *array;
1162 }
1163 }
1164
1165 return 0;
1166 }
1167
1168 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1169 const struct perf_sample *sample,
1170 bool swapped)
1171 {
1172 u64 *array;
1173
1174 /*
1175 * used for cross-endian analysis. See git commit 65014ab3
1176 * for why this goofiness is needed.
1177 */
1178 union u64_swap u;
1179
1180 array = event->sample.array;
1181
1182 if (type & PERF_SAMPLE_IP) {
1183 event->ip.ip = sample->ip;
1184 array++;
1185 }
1186
1187 if (type & PERF_SAMPLE_TID) {
1188 u.val32[0] = sample->pid;
1189 u.val32[1] = sample->tid;
1190 if (swapped) {
1191 /*
1192 * Inverse of what is done in perf_evsel__parse_sample
1193 */
1194 u.val32[0] = bswap_32(u.val32[0]);
1195 u.val32[1] = bswap_32(u.val32[1]);
1196 u.val64 = bswap_64(u.val64);
1197 }
1198
1199 *array = u.val64;
1200 array++;
1201 }
1202
1203 if (type & PERF_SAMPLE_TIME) {
1204 *array = sample->time;
1205 array++;
1206 }
1207
1208 if (type & PERF_SAMPLE_ADDR) {
1209 *array = sample->addr;
1210 array++;
1211 }
1212
1213 if (type & PERF_SAMPLE_ID) {
1214 *array = sample->id;
1215 array++;
1216 }
1217
1218 if (type & PERF_SAMPLE_STREAM_ID) {
1219 *array = sample->stream_id;
1220 array++;
1221 }
1222
1223 if (type & PERF_SAMPLE_CPU) {
1224 u.val32[0] = sample->cpu;
1225 if (swapped) {
1226 /*
1227 * Inverse of what is done in perf_evsel__parse_sample
1228 */
1229 u.val32[0] = bswap_32(u.val32[0]);
1230 u.val64 = bswap_64(u.val64);
1231 }
1232 *array = u.val64;
1233 array++;
1234 }
1235
1236 if (type & PERF_SAMPLE_PERIOD) {
1237 *array = sample->period;
1238 array++;
1239 }
1240
1241 return 0;
1242 }
1243
1244 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
1245 {
1246 return pevent_find_field(evsel->tp_format, name);
1247 }
1248
1249 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
1250 const char *name)
1251 {
1252 struct format_field *field = perf_evsel__field(evsel, name);
1253 int offset;
1254
1255 if (!field)
1256 return NULL;
1257
1258 offset = field->offset;
1259
1260 if (field->flags & FIELD_IS_DYNAMIC) {
1261 offset = *(int *)(sample->raw_data + field->offset);
1262 offset &= 0xffff;
1263 }
1264
1265 return sample->raw_data + offset;
1266 }
1267
1268 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
1269 const char *name)
1270 {
1271 struct format_field *field = perf_evsel__field(evsel, name);
1272 void *ptr;
1273 u64 value;
1274
1275 if (!field)
1276 return 0;
1277
1278 ptr = sample->raw_data + field->offset;
1279
1280 switch (field->size) {
1281 case 1:
1282 return *(u8 *)ptr;
1283 case 2:
1284 value = *(u16 *)ptr;
1285 break;
1286 case 4:
1287 value = *(u32 *)ptr;
1288 break;
1289 case 8:
1290 value = *(u64 *)ptr;
1291 break;
1292 default:
1293 return 0;
1294 }
1295
1296 if (!evsel->needs_swap)
1297 return value;
1298
1299 switch (field->size) {
1300 case 2:
1301 return bswap_16(value);
1302 case 4:
1303 return bswap_32(value);
1304 case 8:
1305 return bswap_64(value);
1306 default:
1307 return 0;
1308 }
1309
1310 return 0;
1311 }
1312
1313 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
1314 {
1315 va_list args;
1316 int ret = 0;
1317
1318 if (!*first) {
1319 ret += fprintf(fp, ",");
1320 } else {
1321 ret += fprintf(fp, ":");
1322 *first = false;
1323 }
1324
1325 va_start(args, fmt);
1326 ret += vfprintf(fp, fmt, args);
1327 va_end(args);
1328 return ret;
1329 }
1330
1331 static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
1332 {
1333 if (value == 0)
1334 return 0;
1335
1336 return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
1337 }
1338
1339 #define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
1340
1341 struct bit_names {
1342 int bit;
1343 const char *name;
1344 };
1345
1346 static int bits__fprintf(FILE *fp, const char *field, u64 value,
1347 struct bit_names *bits, bool *first)
1348 {
1349 int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
1350 bool first_bit = true;
1351
1352 do {
1353 if (value & bits[i].bit) {
1354 printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
1355 first_bit = false;
1356 }
1357 } while (bits[++i].name != NULL);
1358
1359 return printed;
1360 }
1361
1362 static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
1363 {
1364 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1365 struct bit_names bits[] = {
1366 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1367 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1368 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1369 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1370 { .name = NULL, }
1371 };
1372 #undef bit_name
1373 return bits__fprintf(fp, "sample_type", value, bits, first);
1374 }
1375
1376 static int read_format__fprintf(FILE *fp, bool *first, u64 value)
1377 {
1378 #define bit_name(n) { PERF_FORMAT_##n, #n }
1379 struct bit_names bits[] = {
1380 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1381 bit_name(ID), bit_name(GROUP),
1382 { .name = NULL, }
1383 };
1384 #undef bit_name
1385 return bits__fprintf(fp, "read_format", value, bits, first);
1386 }
1387
1388 int perf_evsel__fprintf(struct perf_evsel *evsel,
1389 struct perf_attr_details *details, FILE *fp)
1390 {
1391 bool first = true;
1392 int printed = 0;
1393
1394 if (details->event_group) {
1395 struct perf_evsel *pos;
1396
1397 if (!perf_evsel__is_group_leader(evsel))
1398 return 0;
1399
1400 if (evsel->nr_members > 1)
1401 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
1402
1403 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
1404 for_each_group_member(pos, evsel)
1405 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
1406
1407 if (evsel->nr_members > 1)
1408 printed += fprintf(fp, "}");
1409 goto out;
1410 }
1411
1412 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
1413
1414 if (details->verbose || details->freq) {
1415 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
1416 (u64)evsel->attr.sample_freq);
1417 }
1418
1419 if (details->verbose) {
1420 if_print(type);
1421 if_print(config);
1422 if_print(config1);
1423 if_print(config2);
1424 if_print(size);
1425 printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
1426 if (evsel->attr.read_format)
1427 printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
1428 if_print(disabled);
1429 if_print(inherit);
1430 if_print(pinned);
1431 if_print(exclusive);
1432 if_print(exclude_user);
1433 if_print(exclude_kernel);
1434 if_print(exclude_hv);
1435 if_print(exclude_idle);
1436 if_print(mmap);
1437 if_print(comm);
1438 if_print(freq);
1439 if_print(inherit_stat);
1440 if_print(enable_on_exec);
1441 if_print(task);
1442 if_print(watermark);
1443 if_print(precise_ip);
1444 if_print(mmap_data);
1445 if_print(sample_id_all);
1446 if_print(exclude_host);
1447 if_print(exclude_guest);
1448 if_print(__reserved_1);
1449 if_print(wakeup_events);
1450 if_print(bp_type);
1451 if_print(branch_sample_type);
1452 }
1453 out:
1454 fputc('\n', fp);
1455 return ++printed;
1456 }
1457
1458 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
1459 char *msg, size_t msgsize)
1460 {
1461 if ((err == ENOENT || err == ENXIO) &&
1462 evsel->attr.type == PERF_TYPE_HARDWARE &&
1463 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
1464 /*
1465 * If it's cycles then fall back to hrtimer based
1466 * cpu-clock-tick sw counter, which is always available even if
1467 * no PMU support.
1468 *
1469 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
1470 * b0a873e).
1471 */
1472 scnprintf(msg, msgsize, "%s",
1473 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
1474
1475 evsel->attr.type = PERF_TYPE_SOFTWARE;
1476 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
1477
1478 free(evsel->name);
1479 evsel->name = NULL;
1480 return true;
1481 }
1482
1483 return false;
1484 }
1485
1486 int perf_evsel__open_strerror(struct perf_evsel *evsel,
1487 struct perf_target *target,
1488 int err, char *msg, size_t size)
1489 {
1490 switch (err) {
1491 case EPERM:
1492 case EACCES:
1493 return scnprintf(msg, size, "%s",
1494 "You may not have permission to collect %sstats.\n"
1495 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
1496 " -1 - Not paranoid at all\n"
1497 " 0 - Disallow raw tracepoint access for unpriv\n"
1498 " 1 - Disallow cpu events for unpriv\n"
1499 " 2 - Disallow kernel profiling for unpriv",
1500 target->system_wide ? "system-wide " : "");
1501 case ENOENT:
1502 return scnprintf(msg, size, "The %s event is not supported.",
1503 perf_evsel__name(evsel));
1504 case EMFILE:
1505 return scnprintf(msg, size, "%s",
1506 "Too many events are opened.\n"
1507 "Try again after reducing the number of events.");
1508 case ENODEV:
1509 if (target->cpu_list)
1510 return scnprintf(msg, size, "%s",
1511 "No such device - did you specify an out-of-range profile CPU?\n");
1512 break;
1513 case EOPNOTSUPP:
1514 if (evsel->attr.precise_ip)
1515 return scnprintf(msg, size, "%s",
1516 "\'precise\' request may not be supported. Try removing 'p' modifier.");
1517 #if defined(__i386__) || defined(__x86_64__)
1518 if (evsel->attr.type == PERF_TYPE_HARDWARE)
1519 return scnprintf(msg, size, "%s",
1520 "No hardware sampling interrupt available.\n"
1521 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
1522 #endif
1523 break;
1524 default:
1525 break;
1526 }
1527
1528 return scnprintf(msg, size,
1529 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s). \n"
1530 "/bin/dmesg may provide additional information.\n"
1531 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
1532 err, strerror(err), perf_evsel__name(evsel));
1533 }
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