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mm: rename alloc_pages_exact_node() to __alloc_pages_node()
[linux/fpc-iii.git] / tools / perf / util / evsel.c
blobc53f79123b37f4ab506f3a914263d59c3122cfb6
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 #include "stat.h"
30
31 static struct {
32 bool sample_id_all;
33 bool exclude_guest;
34 bool mmap2;
35 bool cloexec;
36 bool clockid;
37 bool clockid_wrong;
38 } perf_missing_features;
39
40 static clockid_t clockid;
41
42 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
43 {
44 return 0;
45 }
46
47 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
48 {
49 }
50
51 static struct {
52 size_t size;
53 int (*init)(struct perf_evsel *evsel);
54 void (*fini)(struct perf_evsel *evsel);
55 } perf_evsel__object = {
56 .size = sizeof(struct perf_evsel),
57 .init = perf_evsel__no_extra_init,
58 .fini = perf_evsel__no_extra_fini,
59 };
60
61 int perf_evsel__object_config(size_t object_size,
62 int (*init)(struct perf_evsel *evsel),
63 void (*fini)(struct perf_evsel *evsel))
64 {
65
66 if (object_size == 0)
67 goto set_methods;
68
69 if (perf_evsel__object.size > object_size)
70 return -EINVAL;
71
72 perf_evsel__object.size = object_size;
73
74 set_methods:
75 if (init != NULL)
76 perf_evsel__object.init = init;
77
78 if (fini != NULL)
79 perf_evsel__object.fini = fini;
80
81 return 0;
82 }
83
84 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
85
86 int __perf_evsel__sample_size(u64 sample_type)
87 {
88 u64 mask = sample_type & PERF_SAMPLE_MASK;
89 int size = 0;
90 int i;
91
92 for (i = 0; i < 64; i++) {
93 if (mask & (1ULL << i))
94 size++;
95 }
96
97 size *= sizeof(u64);
98
99 return size;
100 }
101
102 /**
103 * __perf_evsel__calc_id_pos - calculate id_pos.
104 * @sample_type: sample type
105 *
106 * This function returns the position of the event id (PERF_SAMPLE_ID or
107 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
108 * sample_event.
109 */
110 static int __perf_evsel__calc_id_pos(u64 sample_type)
111 {
112 int idx = 0;
113
114 if (sample_type & PERF_SAMPLE_IDENTIFIER)
115 return 0;
116
117 if (!(sample_type & PERF_SAMPLE_ID))
118 return -1;
119
120 if (sample_type & PERF_SAMPLE_IP)
121 idx += 1;
122
123 if (sample_type & PERF_SAMPLE_TID)
124 idx += 1;
125
126 if (sample_type & PERF_SAMPLE_TIME)
127 idx += 1;
128
129 if (sample_type & PERF_SAMPLE_ADDR)
130 idx += 1;
131
132 return idx;
133 }
134
135 /**
136 * __perf_evsel__calc_is_pos - calculate is_pos.
137 * @sample_type: sample type
138 *
139 * This function returns the position (counting backwards) of the event id
140 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
141 * sample_id_all is used there is an id sample appended to non-sample events.
142 */
143 static int __perf_evsel__calc_is_pos(u64 sample_type)
144 {
145 int idx = 1;
146
147 if (sample_type & PERF_SAMPLE_IDENTIFIER)
148 return 1;
149
150 if (!(sample_type & PERF_SAMPLE_ID))
151 return -1;
152
153 if (sample_type & PERF_SAMPLE_CPU)
154 idx += 1;
155
156 if (sample_type & PERF_SAMPLE_STREAM_ID)
157 idx += 1;
158
159 return idx;
160 }
161
162 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
163 {
164 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
165 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
166 }
167
168 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
169 enum perf_event_sample_format bit)
170 {
171 if (!(evsel->attr.sample_type & bit)) {
172 evsel->attr.sample_type |= bit;
173 evsel->sample_size += sizeof(u64);
174 perf_evsel__calc_id_pos(evsel);
175 }
176 }
177
178 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
179 enum perf_event_sample_format bit)
180 {
181 if (evsel->attr.sample_type & bit) {
182 evsel->attr.sample_type &= ~bit;
183 evsel->sample_size -= sizeof(u64);
184 perf_evsel__calc_id_pos(evsel);
185 }
186 }
187
188 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
189 bool can_sample_identifier)
190 {
191 if (can_sample_identifier) {
192 perf_evsel__reset_sample_bit(evsel, ID);
193 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
194 } else {
195 perf_evsel__set_sample_bit(evsel, ID);
196 }
197 evsel->attr.read_format |= PERF_FORMAT_ID;
198 }
199
200 void perf_evsel__init(struct perf_evsel *evsel,
201 struct perf_event_attr *attr, int idx)
202 {
203 evsel->idx = idx;
204 evsel->tracking = !idx;
205 evsel->attr = *attr;
206 evsel->leader = evsel;
207 evsel->unit = "";
208 evsel->scale = 1.0;
209 evsel->evlist = NULL;
210 INIT_LIST_HEAD(&evsel->node);
211 INIT_LIST_HEAD(&evsel->config_terms);
212 perf_evsel__object.init(evsel);
213 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
214 perf_evsel__calc_id_pos(evsel);
215 evsel->cmdline_group_boundary = false;
216 }
217
218 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
219 {
220 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
221
222 if (evsel != NULL)
223 perf_evsel__init(evsel, attr, idx);
224
225 return evsel;
226 }
227
228 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
229 {
230 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
231
232 if (evsel != NULL) {
233 struct perf_event_attr attr = {
234 .type = PERF_TYPE_TRACEPOINT,
235 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
236 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
237 };
238
239 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
240 goto out_free;
241
242 evsel->tp_format = trace_event__tp_format(sys, name);
243 if (evsel->tp_format == NULL)
244 goto out_free;
245
246 event_attr_init(&attr);
247 attr.config = evsel->tp_format->id;
248 attr.sample_period = 1;
249 perf_evsel__init(evsel, &attr, idx);
250 }
251
252 return evsel;
253
254 out_free:
255 zfree(&evsel->name);
256 free(evsel);
257 return NULL;
258 }
259
260 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
261 "cycles",
262 "instructions",
263 "cache-references",
264 "cache-misses",
265 "branches",
266 "branch-misses",
267 "bus-cycles",
268 "stalled-cycles-frontend",
269 "stalled-cycles-backend",
270 "ref-cycles",
271 };
272
273 static const char *__perf_evsel__hw_name(u64 config)
274 {
275 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
276 return perf_evsel__hw_names[config];
277
278 return "unknown-hardware";
279 }
280
281 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
282 {
283 int colon = 0, r = 0;
284 struct perf_event_attr *attr = &evsel->attr;
285 bool exclude_guest_default = false;
286
287 #define MOD_PRINT(context, mod) do { \
288 if (!attr->exclude_##context) { \
289 if (!colon) colon = ++r; \
290 r += scnprintf(bf + r, size - r, "%c", mod); \
291 } } while(0)
292
293 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
294 MOD_PRINT(kernel, 'k');
295 MOD_PRINT(user, 'u');
296 MOD_PRINT(hv, 'h');
297 exclude_guest_default = true;
298 }
299
300 if (attr->precise_ip) {
301 if (!colon)
302 colon = ++r;
303 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
304 exclude_guest_default = true;
305 }
306
307 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
308 MOD_PRINT(host, 'H');
309 MOD_PRINT(guest, 'G');
310 }
311 #undef MOD_PRINT
312 if (colon)
313 bf[colon - 1] = ':';
314 return r;
315 }
316
317 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
318 {
319 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
320 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
321 }
322
323 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
324 "cpu-clock",
325 "task-clock",
326 "page-faults",
327 "context-switches",
328 "cpu-migrations",
329 "minor-faults",
330 "major-faults",
331 "alignment-faults",
332 "emulation-faults",
333 "dummy",
334 };
335
336 static const char *__perf_evsel__sw_name(u64 config)
337 {
338 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
339 return perf_evsel__sw_names[config];
340 return "unknown-software";
341 }
342
343 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
344 {
345 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
346 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
347 }
348
349 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
350 {
351 int r;
352
353 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
354
355 if (type & HW_BREAKPOINT_R)
356 r += scnprintf(bf + r, size - r, "r");
357
358 if (type & HW_BREAKPOINT_W)
359 r += scnprintf(bf + r, size - r, "w");
360
361 if (type & HW_BREAKPOINT_X)
362 r += scnprintf(bf + r, size - r, "x");
363
364 return r;
365 }
366
367 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
368 {
369 struct perf_event_attr *attr = &evsel->attr;
370 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
371 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
372 }
373
374 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
375 [PERF_EVSEL__MAX_ALIASES] = {
376 { "L1-dcache", "l1-d", "l1d", "L1-data", },
377 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
378 { "LLC", "L2", },
379 { "dTLB", "d-tlb", "Data-TLB", },
380 { "iTLB", "i-tlb", "Instruction-TLB", },
381 { "branch", "branches", "bpu", "btb", "bpc", },
382 { "node", },
383 };
384
385 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
386 [PERF_EVSEL__MAX_ALIASES] = {
387 { "load", "loads", "read", },
388 { "store", "stores", "write", },
389 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
390 };
391
392 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
393 [PERF_EVSEL__MAX_ALIASES] = {
394 { "refs", "Reference", "ops", "access", },
395 { "misses", "miss", },
396 };
397
398 #define C(x) PERF_COUNT_HW_CACHE_##x
399 #define CACHE_READ (1 << C(OP_READ))
400 #define CACHE_WRITE (1 << C(OP_WRITE))
401 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
402 #define COP(x) (1 << x)
403
404 /*
405 * cache operartion stat
406 * L1I : Read and prefetch only
407 * ITLB and BPU : Read-only
408 */
409 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
410 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
411 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
412 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
413 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
414 [C(ITLB)] = (CACHE_READ),
415 [C(BPU)] = (CACHE_READ),
416 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
417 };
418
419 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
420 {
421 if (perf_evsel__hw_cache_stat[type] & COP(op))
422 return true; /* valid */
423 else
424 return false; /* invalid */
425 }
426
427 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
428 char *bf, size_t size)
429 {
430 if (result) {
431 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
432 perf_evsel__hw_cache_op[op][0],
433 perf_evsel__hw_cache_result[result][0]);
434 }
435
436 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
437 perf_evsel__hw_cache_op[op][1]);
438 }
439
440 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
441 {
442 u8 op, result, type = (config >> 0) & 0xff;
443 const char *err = "unknown-ext-hardware-cache-type";
444
445 if (type > PERF_COUNT_HW_CACHE_MAX)
446 goto out_err;
447
448 op = (config >> 8) & 0xff;
449 err = "unknown-ext-hardware-cache-op";
450 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
451 goto out_err;
452
453 result = (config >> 16) & 0xff;
454 err = "unknown-ext-hardware-cache-result";
455 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
456 goto out_err;
457
458 err = "invalid-cache";
459 if (!perf_evsel__is_cache_op_valid(type, op))
460 goto out_err;
461
462 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
463 out_err:
464 return scnprintf(bf, size, "%s", err);
465 }
466
467 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
468 {
469 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
470 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
471 }
472
473 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
474 {
475 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
476 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
477 }
478
479 const char *perf_evsel__name(struct perf_evsel *evsel)
480 {
481 char bf[128];
482
483 if (evsel->name)
484 return evsel->name;
485
486 switch (evsel->attr.type) {
487 case PERF_TYPE_RAW:
488 perf_evsel__raw_name(evsel, bf, sizeof(bf));
489 break;
490
491 case PERF_TYPE_HARDWARE:
492 perf_evsel__hw_name(evsel, bf, sizeof(bf));
493 break;
494
495 case PERF_TYPE_HW_CACHE:
496 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
497 break;
498
499 case PERF_TYPE_SOFTWARE:
500 perf_evsel__sw_name(evsel, bf, sizeof(bf));
501 break;
502
503 case PERF_TYPE_TRACEPOINT:
504 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
505 break;
506
507 case PERF_TYPE_BREAKPOINT:
508 perf_evsel__bp_name(evsel, bf, sizeof(bf));
509 break;
510
511 default:
512 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
513 evsel->attr.type);
514 break;
515 }
516
517 evsel->name = strdup(bf);
518
519 return evsel->name ?: "unknown";
520 }
521
522 const char *perf_evsel__group_name(struct perf_evsel *evsel)
523 {
524 return evsel->group_name ?: "anon group";
525 }
526
527 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
528 {
529 int ret;
530 struct perf_evsel *pos;
531 const char *group_name = perf_evsel__group_name(evsel);
532
533 ret = scnprintf(buf, size, "%s", group_name);
534
535 ret += scnprintf(buf + ret, size - ret, " { %s",
536 perf_evsel__name(evsel));
537
538 for_each_group_member(pos, evsel)
539 ret += scnprintf(buf + ret, size - ret, ", %s",
540 perf_evsel__name(pos));
541
542 ret += scnprintf(buf + ret, size - ret, " }");
543
544 return ret;
545 }
546
547 static void
548 perf_evsel__config_callgraph(struct perf_evsel *evsel,
549 struct record_opts *opts,
550 struct callchain_param *param)
551 {
552 bool function = perf_evsel__is_function_event(evsel);
553 struct perf_event_attr *attr = &evsel->attr;
554
555 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
556
557 if (param->record_mode == CALLCHAIN_LBR) {
558 if (!opts->branch_stack) {
559 if (attr->exclude_user) {
560 pr_warning("LBR callstack option is only available "
561 "to get user callchain information. "
562 "Falling back to framepointers.\n");
563 } else {
564 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
565 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
566 PERF_SAMPLE_BRANCH_CALL_STACK;
567 }
568 } else
569 pr_warning("Cannot use LBR callstack with branch stack. "
570 "Falling back to framepointers.\n");
571 }
572
573 if (param->record_mode == CALLCHAIN_DWARF) {
574 if (!function) {
575 perf_evsel__set_sample_bit(evsel, REGS_USER);
576 perf_evsel__set_sample_bit(evsel, STACK_USER);
577 attr->sample_regs_user = PERF_REGS_MASK;
578 attr->sample_stack_user = param->dump_size;
579 attr->exclude_callchain_user = 1;
580 } else {
581 pr_info("Cannot use DWARF unwind for function trace event,"
582 " falling back to framepointers.\n");
583 }
584 }
585
586 if (function) {
587 pr_info("Disabling user space callchains for function trace event.\n");
588 attr->exclude_callchain_user = 1;
589 }
590 }
591
592 static void
593 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
594 struct callchain_param *param)
595 {
596 struct perf_event_attr *attr = &evsel->attr;
597
598 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
599 if (param->record_mode == CALLCHAIN_LBR) {
600 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
601 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
602 PERF_SAMPLE_BRANCH_CALL_STACK);
603 }
604 if (param->record_mode == CALLCHAIN_DWARF) {
605 perf_evsel__reset_sample_bit(evsel, REGS_USER);
606 perf_evsel__reset_sample_bit(evsel, STACK_USER);
607 }
608 }
609
610 static void apply_config_terms(struct perf_evsel *evsel,
611 struct record_opts *opts)
612 {
613 struct perf_evsel_config_term *term;
614 struct list_head *config_terms = &evsel->config_terms;
615 struct perf_event_attr *attr = &evsel->attr;
616 struct callchain_param param;
617 u32 dump_size = 0;
618 char *callgraph_buf = NULL;
619
620 /* callgraph default */
621 param.record_mode = callchain_param.record_mode;
622
623 list_for_each_entry(term, config_terms, list) {
624 switch (term->type) {
625 case PERF_EVSEL__CONFIG_TERM_PERIOD:
626 attr->sample_period = term->val.period;
627 attr->freq = 0;
628 break;
629 case PERF_EVSEL__CONFIG_TERM_FREQ:
630 attr->sample_freq = term->val.freq;
631 attr->freq = 1;
632 break;
633 case PERF_EVSEL__CONFIG_TERM_TIME:
634 if (term->val.time)
635 perf_evsel__set_sample_bit(evsel, TIME);
636 else
637 perf_evsel__reset_sample_bit(evsel, TIME);
638 break;
639 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
640 callgraph_buf = term->val.callgraph;
641 break;
642 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
643 dump_size = term->val.stack_user;
644 break;
645 default:
646 break;
647 }
648 }
649
650 /* User explicitly set per-event callgraph, clear the old setting and reset. */
651 if ((callgraph_buf != NULL) || (dump_size > 0)) {
652
653 /* parse callgraph parameters */
654 if (callgraph_buf != NULL) {
655 if (!strcmp(callgraph_buf, "no")) {
656 param.enabled = false;
657 param.record_mode = CALLCHAIN_NONE;
658 } else {
659 param.enabled = true;
660 if (parse_callchain_record(callgraph_buf, &param)) {
661 pr_err("per-event callgraph setting for %s failed. "
662 "Apply callgraph global setting for it\n",
663 evsel->name);
664 return;
665 }
666 }
667 }
668 if (dump_size > 0) {
669 dump_size = round_up(dump_size, sizeof(u64));
670 param.dump_size = dump_size;
671 }
672
673 /* If global callgraph set, clear it */
674 if (callchain_param.enabled)
675 perf_evsel__reset_callgraph(evsel, &callchain_param);
676
677 /* set perf-event callgraph */
678 if (param.enabled)
679 perf_evsel__config_callgraph(evsel, opts, &param);
680 }
681 }
682
683 /*
684 * The enable_on_exec/disabled value strategy:
685 *
686 * 1) For any type of traced program:
687 * - all independent events and group leaders are disabled
688 * - all group members are enabled
689 *
690 * Group members are ruled by group leaders. They need to
691 * be enabled, because the group scheduling relies on that.
692 *
693 * 2) For traced programs executed by perf:
694 * - all independent events and group leaders have
695 * enable_on_exec set
696 * - we don't specifically enable or disable any event during
697 * the record command
698 *
699 * Independent events and group leaders are initially disabled
700 * and get enabled by exec. Group members are ruled by group
701 * leaders as stated in 1).
702 *
703 * 3) For traced programs attached by perf (pid/tid):
704 * - we specifically enable or disable all events during
705 * the record command
706 *
707 * When attaching events to already running traced we
708 * enable/disable events specifically, as there's no
709 * initial traced exec call.
710 */
711 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
712 {
713 struct perf_evsel *leader = evsel->leader;
714 struct perf_event_attr *attr = &evsel->attr;
715 int track = evsel->tracking;
716 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
717
718 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
719 attr->inherit = !opts->no_inherit;
720
721 perf_evsel__set_sample_bit(evsel, IP);
722 perf_evsel__set_sample_bit(evsel, TID);
723
724 if (evsel->sample_read) {
725 perf_evsel__set_sample_bit(evsel, READ);
726
727 /*
728 * We need ID even in case of single event, because
729 * PERF_SAMPLE_READ process ID specific data.
730 */
731 perf_evsel__set_sample_id(evsel, false);
732
733 /*
734 * Apply group format only if we belong to group
735 * with more than one members.
736 */
737 if (leader->nr_members > 1) {
738 attr->read_format |= PERF_FORMAT_GROUP;
739 attr->inherit = 0;
740 }
741 }
742
743 /*
744 * We default some events to have a default interval. But keep
745 * it a weak assumption overridable by the user.
746 */
747 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
748 opts->user_interval != ULLONG_MAX)) {
749 if (opts->freq) {
750 perf_evsel__set_sample_bit(evsel, PERIOD);
751 attr->freq = 1;
752 attr->sample_freq = opts->freq;
753 } else {
754 attr->sample_period = opts->default_interval;
755 }
756 }
757
758 /*
759 * Disable sampling for all group members other
760 * than leader in case leader 'leads' the sampling.
761 */
762 if ((leader != evsel) && leader->sample_read) {
763 attr->sample_freq = 0;
764 attr->sample_period = 0;
765 }
766
767 if (opts->no_samples)
768 attr->sample_freq = 0;
769
770 if (opts->inherit_stat)
771 attr->inherit_stat = 1;
772
773 if (opts->sample_address) {
774 perf_evsel__set_sample_bit(evsel, ADDR);
775 attr->mmap_data = track;
776 }
777
778 /*
779 * We don't allow user space callchains for function trace
780 * event, due to issues with page faults while tracing page
781 * fault handler and its overall trickiness nature.
782 */
783 if (perf_evsel__is_function_event(evsel))
784 evsel->attr.exclude_callchain_user = 1;
785
786 if (callchain_param.enabled && !evsel->no_aux_samples)
787 perf_evsel__config_callgraph(evsel, opts, &callchain_param);
788
789 if (opts->sample_intr_regs) {
790 attr->sample_regs_intr = opts->sample_intr_regs;
791 perf_evsel__set_sample_bit(evsel, REGS_INTR);
792 }
793
794 if (target__has_cpu(&opts->target))
795 perf_evsel__set_sample_bit(evsel, CPU);
796
797 if (opts->period)
798 perf_evsel__set_sample_bit(evsel, PERIOD);
799
800 /*
801 * When the user explicitely disabled time don't force it here.
802 */
803 if (opts->sample_time &&
804 (!perf_missing_features.sample_id_all &&
805 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
806 opts->sample_time_set)))
807 perf_evsel__set_sample_bit(evsel, TIME);
808
809 if (opts->raw_samples && !evsel->no_aux_samples) {
810 perf_evsel__set_sample_bit(evsel, TIME);
811 perf_evsel__set_sample_bit(evsel, RAW);
812 perf_evsel__set_sample_bit(evsel, CPU);
813 }
814
815 if (opts->sample_address)
816 perf_evsel__set_sample_bit(evsel, DATA_SRC);
817
818 if (opts->no_buffering) {
819 attr->watermark = 0;
820 attr->wakeup_events = 1;
821 }
822 if (opts->branch_stack && !evsel->no_aux_samples) {
823 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
824 attr->branch_sample_type = opts->branch_stack;
825 }
826
827 if (opts->sample_weight)
828 perf_evsel__set_sample_bit(evsel, WEIGHT);
829
830 attr->task = track;
831 attr->mmap = track;
832 attr->mmap2 = track && !perf_missing_features.mmap2;
833 attr->comm = track;
834
835 if (opts->record_switch_events)
836 attr->context_switch = track;
837
838 if (opts->sample_transaction)
839 perf_evsel__set_sample_bit(evsel, TRANSACTION);
840
841 if (opts->running_time) {
842 evsel->attr.read_format |=
843 PERF_FORMAT_TOTAL_TIME_ENABLED |
844 PERF_FORMAT_TOTAL_TIME_RUNNING;
845 }
846
847 /*
848 * XXX see the function comment above
849 *
850 * Disabling only independent events or group leaders,
851 * keeping group members enabled.
852 */
853 if (perf_evsel__is_group_leader(evsel))
854 attr->disabled = 1;
855
856 /*
857 * Setting enable_on_exec for independent events and
858 * group leaders for traced executed by perf.
859 */
860 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
861 !opts->initial_delay)
862 attr->enable_on_exec = 1;
863
864 if (evsel->immediate) {
865 attr->disabled = 0;
866 attr->enable_on_exec = 0;
867 }
868
869 clockid = opts->clockid;
870 if (opts->use_clockid) {
871 attr->use_clockid = 1;
872 attr->clockid = opts->clockid;
873 }
874
875 /*
876 * Apply event specific term settings,
877 * it overloads any global configuration.
878 */
879 apply_config_terms(evsel, opts);
880 }
881
882 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
883 {
884 int cpu, thread;
885
886 if (evsel->system_wide)
887 nthreads = 1;
888
889 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
890
891 if (evsel->fd) {
892 for (cpu = 0; cpu < ncpus; cpu++) {
893 for (thread = 0; thread < nthreads; thread++) {
894 FD(evsel, cpu, thread) = -1;
895 }
896 }
897 }
898
899 return evsel->fd != NULL ? 0 : -ENOMEM;
900 }
901
902 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
903 int ioc, void *arg)
904 {
905 int cpu, thread;
906
907 if (evsel->system_wide)
908 nthreads = 1;
909
910 for (cpu = 0; cpu < ncpus; cpu++) {
911 for (thread = 0; thread < nthreads; thread++) {
912 int fd = FD(evsel, cpu, thread),
913 err = ioctl(fd, ioc, arg);
914
915 if (err)
916 return err;
917 }
918 }
919
920 return 0;
921 }
922
923 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
924 const char *filter)
925 {
926 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
927 PERF_EVENT_IOC_SET_FILTER,
928 (void *)filter);
929 }
930
931 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
932 {
933 char *new_filter = strdup(filter);
934
935 if (new_filter != NULL) {
936 free(evsel->filter);
937 evsel->filter = new_filter;
938 return 0;
939 }
940
941 return -1;
942 }
943
944 int perf_evsel__append_filter(struct perf_evsel *evsel,
945 const char *op, const char *filter)
946 {
947 char *new_filter;
948
949 if (evsel->filter == NULL)
950 return perf_evsel__set_filter(evsel, filter);
951
952 if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
953 free(evsel->filter);
954 evsel->filter = new_filter;
955 return 0;
956 }
957
958 return -1;
959 }
960
961 int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
962 {
963 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
964 PERF_EVENT_IOC_ENABLE,
965 0);
966 }
967
968 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
969 {
970 if (ncpus == 0 || nthreads == 0)
971 return 0;
972
973 if (evsel->system_wide)
974 nthreads = 1;
975
976 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
977 if (evsel->sample_id == NULL)
978 return -ENOMEM;
979
980 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
981 if (evsel->id == NULL) {
982 xyarray__delete(evsel->sample_id);
983 evsel->sample_id = NULL;
984 return -ENOMEM;
985 }
986
987 return 0;
988 }
989
990 static void perf_evsel__free_fd(struct perf_evsel *evsel)
991 {
992 xyarray__delete(evsel->fd);
993 evsel->fd = NULL;
994 }
995
996 static void perf_evsel__free_id(struct perf_evsel *evsel)
997 {
998 xyarray__delete(evsel->sample_id);
999 evsel->sample_id = NULL;
1000 zfree(&evsel->id);
1001 }
1002
1003 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1004 {
1005 struct perf_evsel_config_term *term, *h;
1006
1007 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1008 list_del(&term->list);
1009 free(term);
1010 }
1011 }
1012
1013 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1014 {
1015 int cpu, thread;
1016
1017 if (evsel->system_wide)
1018 nthreads = 1;
1019
1020 for (cpu = 0; cpu < ncpus; cpu++)
1021 for (thread = 0; thread < nthreads; ++thread) {
1022 close(FD(evsel, cpu, thread));
1023 FD(evsel, cpu, thread) = -1;
1024 }
1025 }
1026
1027 void perf_evsel__exit(struct perf_evsel *evsel)
1028 {
1029 assert(list_empty(&evsel->node));
1030 assert(evsel->evlist == NULL);
1031 perf_evsel__free_fd(evsel);
1032 perf_evsel__free_id(evsel);
1033 perf_evsel__free_config_terms(evsel);
1034 close_cgroup(evsel->cgrp);
1035 cpu_map__put(evsel->cpus);
1036 thread_map__put(evsel->threads);
1037 zfree(&evsel->group_name);
1038 zfree(&evsel->name);
1039 perf_evsel__object.fini(evsel);
1040 }
1041
1042 void perf_evsel__delete(struct perf_evsel *evsel)
1043 {
1044 perf_evsel__exit(evsel);
1045 free(evsel);
1046 }
1047
1048 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1049 struct perf_counts_values *count)
1050 {
1051 struct perf_counts_values tmp;
1052
1053 if (!evsel->prev_raw_counts)
1054 return;
1055
1056 if (cpu == -1) {
1057 tmp = evsel->prev_raw_counts->aggr;
1058 evsel->prev_raw_counts->aggr = *count;
1059 } else {
1060 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1061 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1062 }
1063
1064 count->val = count->val - tmp.val;
1065 count->ena = count->ena - tmp.ena;
1066 count->run = count->run - tmp.run;
1067 }
1068
1069 void perf_counts_values__scale(struct perf_counts_values *count,
1070 bool scale, s8 *pscaled)
1071 {
1072 s8 scaled = 0;
1073
1074 if (scale) {
1075 if (count->run == 0) {
1076 scaled = -1;
1077 count->val = 0;
1078 } else if (count->run < count->ena) {
1079 scaled = 1;
1080 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1081 }
1082 } else
1083 count->ena = count->run = 0;
1084
1085 if (pscaled)
1086 *pscaled = scaled;
1087 }
1088
1089 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1090 struct perf_counts_values *count)
1091 {
1092 memset(count, 0, sizeof(*count));
1093
1094 if (FD(evsel, cpu, thread) < 0)
1095 return -EINVAL;
1096
1097 if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
1098 return -errno;
1099
1100 return 0;
1101 }
1102
1103 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1104 int cpu, int thread, bool scale)
1105 {
1106 struct perf_counts_values count;
1107 size_t nv = scale ? 3 : 1;
1108
1109 if (FD(evsel, cpu, thread) < 0)
1110 return -EINVAL;
1111
1112 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1113 return -ENOMEM;
1114
1115 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
1116 return -errno;
1117
1118 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1119 perf_counts_values__scale(&count, scale, NULL);
1120 *perf_counts(evsel->counts, cpu, thread) = count;
1121 return 0;
1122 }
1123
1124 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1125 {
1126 struct perf_evsel *leader = evsel->leader;
1127 int fd;
1128
1129 if (perf_evsel__is_group_leader(evsel))
1130 return -1;
1131
1132 /*
1133 * Leader must be already processed/open,
1134 * if not it's a bug.
1135 */
1136 BUG_ON(!leader->fd);
1137
1138 fd = FD(leader, cpu, thread);
1139 BUG_ON(fd == -1);
1140
1141 return fd;
1142 }
1143
1144 struct bit_names {
1145 int bit;
1146 const char *name;
1147 };
1148
1149 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1150 {
1151 bool first_bit = true;
1152 int i = 0;
1153
1154 do {
1155 if (value & bits[i].bit) {
1156 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1157 first_bit = false;
1158 }
1159 } while (bits[++i].name != NULL);
1160 }
1161
1162 static void __p_sample_type(char *buf, size_t size, u64 value)
1163 {
1164 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1165 struct bit_names bits[] = {
1166 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1167 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1168 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1169 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1170 bit_name(IDENTIFIER), bit_name(REGS_INTR),
1171 { .name = NULL, }
1172 };
1173 #undef bit_name
1174 __p_bits(buf, size, value, bits);
1175 }
1176
1177 static void __p_read_format(char *buf, size_t size, u64 value)
1178 {
1179 #define bit_name(n) { PERF_FORMAT_##n, #n }
1180 struct bit_names bits[] = {
1181 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1182 bit_name(ID), bit_name(GROUP),
1183 { .name = NULL, }
1184 };
1185 #undef bit_name
1186 __p_bits(buf, size, value, bits);
1187 }
1188
1189 #define BUF_SIZE 1024
1190
1191 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1192 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1193 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1194 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1195 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1196
1197 #define PRINT_ATTRn(_n, _f, _p) \
1198 do { \
1199 if (attr->_f) { \
1200 _p(attr->_f); \
1201 ret += attr__fprintf(fp, _n, buf, priv);\
1202 } \
1203 } while (0)
1204
1205 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1206
1207 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1208 attr__fprintf_f attr__fprintf, void *priv)
1209 {
1210 char buf[BUF_SIZE];
1211 int ret = 0;
1212
1213 PRINT_ATTRf(type, p_unsigned);
1214 PRINT_ATTRf(size, p_unsigned);
1215 PRINT_ATTRf(config, p_hex);
1216 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1217 PRINT_ATTRf(sample_type, p_sample_type);
1218 PRINT_ATTRf(read_format, p_read_format);
1219
1220 PRINT_ATTRf(disabled, p_unsigned);
1221 PRINT_ATTRf(inherit, p_unsigned);
1222 PRINT_ATTRf(pinned, p_unsigned);
1223 PRINT_ATTRf(exclusive, p_unsigned);
1224 PRINT_ATTRf(exclude_user, p_unsigned);
1225 PRINT_ATTRf(exclude_kernel, p_unsigned);
1226 PRINT_ATTRf(exclude_hv, p_unsigned);
1227 PRINT_ATTRf(exclude_idle, p_unsigned);
1228 PRINT_ATTRf(mmap, p_unsigned);
1229 PRINT_ATTRf(comm, p_unsigned);
1230 PRINT_ATTRf(freq, p_unsigned);
1231 PRINT_ATTRf(inherit_stat, p_unsigned);
1232 PRINT_ATTRf(enable_on_exec, p_unsigned);
1233 PRINT_ATTRf(task, p_unsigned);
1234 PRINT_ATTRf(watermark, p_unsigned);
1235 PRINT_ATTRf(precise_ip, p_unsigned);
1236 PRINT_ATTRf(mmap_data, p_unsigned);
1237 PRINT_ATTRf(sample_id_all, p_unsigned);
1238 PRINT_ATTRf(exclude_host, p_unsigned);
1239 PRINT_ATTRf(exclude_guest, p_unsigned);
1240 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1241 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1242 PRINT_ATTRf(mmap2, p_unsigned);
1243 PRINT_ATTRf(comm_exec, p_unsigned);
1244 PRINT_ATTRf(use_clockid, p_unsigned);
1245 PRINT_ATTRf(context_switch, p_unsigned);
1246
1247 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1248 PRINT_ATTRf(bp_type, p_unsigned);
1249 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1250 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1251 PRINT_ATTRf(sample_regs_user, p_hex);
1252 PRINT_ATTRf(sample_stack_user, p_unsigned);
1253 PRINT_ATTRf(clockid, p_signed);
1254 PRINT_ATTRf(sample_regs_intr, p_hex);
1255 PRINT_ATTRf(aux_watermark, p_unsigned);
1256
1257 return ret;
1258 }
1259
1260 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1261 void *priv __attribute__((unused)))
1262 {
1263 return fprintf(fp, " %-32s %s\n", name, val);
1264 }
1265
1266 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1267 struct thread_map *threads)
1268 {
1269 int cpu, thread, nthreads;
1270 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1271 int pid = -1, err;
1272 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1273
1274 if (evsel->system_wide)
1275 nthreads = 1;
1276 else
1277 nthreads = threads->nr;
1278
1279 if (evsel->fd == NULL &&
1280 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1281 return -ENOMEM;
1282
1283 if (evsel->cgrp) {
1284 flags |= PERF_FLAG_PID_CGROUP;
1285 pid = evsel->cgrp->fd;
1286 }
1287
1288 fallback_missing_features:
1289 if (perf_missing_features.clockid_wrong)
1290 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1291 if (perf_missing_features.clockid) {
1292 evsel->attr.use_clockid = 0;
1293 evsel->attr.clockid = 0;
1294 }
1295 if (perf_missing_features.cloexec)
1296 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1297 if (perf_missing_features.mmap2)
1298 evsel->attr.mmap2 = 0;
1299 if (perf_missing_features.exclude_guest)
1300 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1301 retry_sample_id:
1302 if (perf_missing_features.sample_id_all)
1303 evsel->attr.sample_id_all = 0;
1304
1305 if (verbose >= 2) {
1306 fprintf(stderr, "%.60s\n", graph_dotted_line);
1307 fprintf(stderr, "perf_event_attr:\n");
1308 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1309 fprintf(stderr, "%.60s\n", graph_dotted_line);
1310 }
1311
1312 for (cpu = 0; cpu < cpus->nr; cpu++) {
1313
1314 for (thread = 0; thread < nthreads; thread++) {
1315 int group_fd;
1316
1317 if (!evsel->cgrp && !evsel->system_wide)
1318 pid = thread_map__pid(threads, thread);
1319
1320 group_fd = get_group_fd(evsel, cpu, thread);
1321 retry_open:
1322 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1323 pid, cpus->map[cpu], group_fd, flags);
1324
1325 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1326 pid,
1327 cpus->map[cpu],
1328 group_fd, flags);
1329 if (FD(evsel, cpu, thread) < 0) {
1330 err = -errno;
1331 pr_debug2("sys_perf_event_open failed, error %d\n",
1332 err);
1333 goto try_fallback;
1334 }
1335 set_rlimit = NO_CHANGE;
1336
1337 /*
1338 * If we succeeded but had to kill clockid, fail and
1339 * have perf_evsel__open_strerror() print us a nice
1340 * error.
1341 */
1342 if (perf_missing_features.clockid ||
1343 perf_missing_features.clockid_wrong) {
1344 err = -EINVAL;
1345 goto out_close;
1346 }
1347 }
1348 }
1349
1350 return 0;
1351
1352 try_fallback:
1353 /*
1354 * perf stat needs between 5 and 22 fds per CPU. When we run out
1355 * of them try to increase the limits.
1356 */
1357 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1358 struct rlimit l;
1359 int old_errno = errno;
1360
1361 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1362 if (set_rlimit == NO_CHANGE)
1363 l.rlim_cur = l.rlim_max;
1364 else {
1365 l.rlim_cur = l.rlim_max + 1000;
1366 l.rlim_max = l.rlim_cur;
1367 }
1368 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1369 set_rlimit++;
1370 errno = old_errno;
1371 goto retry_open;
1372 }
1373 }
1374 errno = old_errno;
1375 }
1376
1377 if (err != -EINVAL || cpu > 0 || thread > 0)
1378 goto out_close;
1379
1380 /*
1381 * Must probe features in the order they were added to the
1382 * perf_event_attr interface.
1383 */
1384 if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1385 perf_missing_features.clockid_wrong = true;
1386 goto fallback_missing_features;
1387 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1388 perf_missing_features.clockid = true;
1389 goto fallback_missing_features;
1390 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1391 perf_missing_features.cloexec = true;
1392 goto fallback_missing_features;
1393 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1394 perf_missing_features.mmap2 = true;
1395 goto fallback_missing_features;
1396 } else if (!perf_missing_features.exclude_guest &&
1397 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1398 perf_missing_features.exclude_guest = true;
1399 goto fallback_missing_features;
1400 } else if (!perf_missing_features.sample_id_all) {
1401 perf_missing_features.sample_id_all = true;
1402 goto retry_sample_id;
1403 }
1404
1405 out_close:
1406 do {
1407 while (--thread >= 0) {
1408 close(FD(evsel, cpu, thread));
1409 FD(evsel, cpu, thread) = -1;
1410 }
1411 thread = nthreads;
1412 } while (--cpu >= 0);
1413 return err;
1414 }
1415
1416 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1417 {
1418 if (evsel->fd == NULL)
1419 return;
1420
1421 perf_evsel__close_fd(evsel, ncpus, nthreads);
1422 perf_evsel__free_fd(evsel);
1423 }
1424
1425 static struct {
1426 struct cpu_map map;
1427 int cpus[1];
1428 } empty_cpu_map = {
1429 .map.nr = 1,
1430 .cpus = { -1, },
1431 };
1432
1433 static struct {
1434 struct thread_map map;
1435 int threads[1];
1436 } empty_thread_map = {
1437 .map.nr = 1,
1438 .threads = { -1, },
1439 };
1440
1441 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1442 struct thread_map *threads)
1443 {
1444 if (cpus == NULL) {
1445 /* Work around old compiler warnings about strict aliasing */
1446 cpus = &empty_cpu_map.map;
1447 }
1448
1449 if (threads == NULL)
1450 threads = &empty_thread_map.map;
1451
1452 return __perf_evsel__open(evsel, cpus, threads);
1453 }
1454
1455 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1456 struct cpu_map *cpus)
1457 {
1458 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1459 }
1460
1461 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1462 struct thread_map *threads)
1463 {
1464 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1465 }
1466
1467 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1468 const union perf_event *event,
1469 struct perf_sample *sample)
1470 {
1471 u64 type = evsel->attr.sample_type;
1472 const u64 *array = event->sample.array;
1473 bool swapped = evsel->needs_swap;
1474 union u64_swap u;
1475
1476 array += ((event->header.size -
1477 sizeof(event->header)) / sizeof(u64)) - 1;
1478
1479 if (type & PERF_SAMPLE_IDENTIFIER) {
1480 sample->id = *array;
1481 array--;
1482 }
1483
1484 if (type & PERF_SAMPLE_CPU) {
1485 u.val64 = *array;
1486 if (swapped) {
1487 /* undo swap of u64, then swap on individual u32s */
1488 u.val64 = bswap_64(u.val64);
1489 u.val32[0] = bswap_32(u.val32[0]);
1490 }
1491
1492 sample->cpu = u.val32[0];
1493 array--;
1494 }
1495
1496 if (type & PERF_SAMPLE_STREAM_ID) {
1497 sample->stream_id = *array;
1498 array--;
1499 }
1500
1501 if (type & PERF_SAMPLE_ID) {
1502 sample->id = *array;
1503 array--;
1504 }
1505
1506 if (type & PERF_SAMPLE_TIME) {
1507 sample->time = *array;
1508 array--;
1509 }
1510
1511 if (type & PERF_SAMPLE_TID) {
1512 u.val64 = *array;
1513 if (swapped) {
1514 /* undo swap of u64, then swap on individual u32s */
1515 u.val64 = bswap_64(u.val64);
1516 u.val32[0] = bswap_32(u.val32[0]);
1517 u.val32[1] = bswap_32(u.val32[1]);
1518 }
1519
1520 sample->pid = u.val32[0];
1521 sample->tid = u.val32[1];
1522 array--;
1523 }
1524
1525 return 0;
1526 }
1527
1528 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1529 u64 size)
1530 {
1531 return size > max_size || offset + size > endp;
1532 }
1533
1534 #define OVERFLOW_CHECK(offset, size, max_size) \
1535 do { \
1536 if (overflow(endp, (max_size), (offset), (size))) \
1537 return -EFAULT; \
1538 } while (0)
1539
1540 #define OVERFLOW_CHECK_u64(offset) \
1541 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1542
1543 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1544 struct perf_sample *data)
1545 {
1546 u64 type = evsel->attr.sample_type;
1547 bool swapped = evsel->needs_swap;
1548 const u64 *array;
1549 u16 max_size = event->header.size;
1550 const void *endp = (void *)event + max_size;
1551 u64 sz;
1552
1553 /*
1554 * used for cross-endian analysis. See git commit 65014ab3
1555 * for why this goofiness is needed.
1556 */
1557 union u64_swap u;
1558
1559 memset(data, 0, sizeof(*data));
1560 data->cpu = data->pid = data->tid = -1;
1561 data->stream_id = data->id = data->time = -1ULL;
1562 data->period = evsel->attr.sample_period;
1563 data->weight = 0;
1564
1565 if (event->header.type != PERF_RECORD_SAMPLE) {
1566 if (!evsel->attr.sample_id_all)
1567 return 0;
1568 return perf_evsel__parse_id_sample(evsel, event, data);
1569 }
1570
1571 array = event->sample.array;
1572
1573 /*
1574 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1575 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1576 * check the format does not go past the end of the event.
1577 */
1578 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1579 return -EFAULT;
1580
1581 data->id = -1ULL;
1582 if (type & PERF_SAMPLE_IDENTIFIER) {
1583 data->id = *array;
1584 array++;
1585 }
1586
1587 if (type & PERF_SAMPLE_IP) {
1588 data->ip = *array;
1589 array++;
1590 }
1591
1592 if (type & PERF_SAMPLE_TID) {
1593 u.val64 = *array;
1594 if (swapped) {
1595 /* undo swap of u64, then swap on individual u32s */
1596 u.val64 = bswap_64(u.val64);
1597 u.val32[0] = bswap_32(u.val32[0]);
1598 u.val32[1] = bswap_32(u.val32[1]);
1599 }
1600
1601 data->pid = u.val32[0];
1602 data->tid = u.val32[1];
1603 array++;
1604 }
1605
1606 if (type & PERF_SAMPLE_TIME) {
1607 data->time = *array;
1608 array++;
1609 }
1610
1611 data->addr = 0;
1612 if (type & PERF_SAMPLE_ADDR) {
1613 data->addr = *array;
1614 array++;
1615 }
1616
1617 if (type & PERF_SAMPLE_ID) {
1618 data->id = *array;
1619 array++;
1620 }
1621
1622 if (type & PERF_SAMPLE_STREAM_ID) {
1623 data->stream_id = *array;
1624 array++;
1625 }
1626
1627 if (type & PERF_SAMPLE_CPU) {
1628
1629 u.val64 = *array;
1630 if (swapped) {
1631 /* undo swap of u64, then swap on individual u32s */
1632 u.val64 = bswap_64(u.val64);
1633 u.val32[0] = bswap_32(u.val32[0]);
1634 }
1635
1636 data->cpu = u.val32[0];
1637 array++;
1638 }
1639
1640 if (type & PERF_SAMPLE_PERIOD) {
1641 data->period = *array;
1642 array++;
1643 }
1644
1645 if (type & PERF_SAMPLE_READ) {
1646 u64 read_format = evsel->attr.read_format;
1647
1648 OVERFLOW_CHECK_u64(array);
1649 if (read_format & PERF_FORMAT_GROUP)
1650 data->read.group.nr = *array;
1651 else
1652 data->read.one.value = *array;
1653
1654 array++;
1655
1656 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1657 OVERFLOW_CHECK_u64(array);
1658 data->read.time_enabled = *array;
1659 array++;
1660 }
1661
1662 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1663 OVERFLOW_CHECK_u64(array);
1664 data->read.time_running = *array;
1665 array++;
1666 }
1667
1668 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1669 if (read_format & PERF_FORMAT_GROUP) {
1670 const u64 max_group_nr = UINT64_MAX /
1671 sizeof(struct sample_read_value);
1672
1673 if (data->read.group.nr > max_group_nr)
1674 return -EFAULT;
1675 sz = data->read.group.nr *
1676 sizeof(struct sample_read_value);
1677 OVERFLOW_CHECK(array, sz, max_size);
1678 data->read.group.values =
1679 (struct sample_read_value *)array;
1680 array = (void *)array + sz;
1681 } else {
1682 OVERFLOW_CHECK_u64(array);
1683 data->read.one.id = *array;
1684 array++;
1685 }
1686 }
1687
1688 if (type & PERF_SAMPLE_CALLCHAIN) {
1689 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1690
1691 OVERFLOW_CHECK_u64(array);
1692 data->callchain = (struct ip_callchain *)array++;
1693 if (data->callchain->nr > max_callchain_nr)
1694 return -EFAULT;
1695 sz = data->callchain->nr * sizeof(u64);
1696 OVERFLOW_CHECK(array, sz, max_size);
1697 array = (void *)array + sz;
1698 }
1699
1700 if (type & PERF_SAMPLE_RAW) {
1701 OVERFLOW_CHECK_u64(array);
1702 u.val64 = *array;
1703 if (WARN_ONCE(swapped,
1704 "Endianness of raw data not corrected!\n")) {
1705 /* undo swap of u64, then swap on individual u32s */
1706 u.val64 = bswap_64(u.val64);
1707 u.val32[0] = bswap_32(u.val32[0]);
1708 u.val32[1] = bswap_32(u.val32[1]);
1709 }
1710 data->raw_size = u.val32[0];
1711 array = (void *)array + sizeof(u32);
1712
1713 OVERFLOW_CHECK(array, data->raw_size, max_size);
1714 data->raw_data = (void *)array;
1715 array = (void *)array + data->raw_size;
1716 }
1717
1718 if (type & PERF_SAMPLE_BRANCH_STACK) {
1719 const u64 max_branch_nr = UINT64_MAX /
1720 sizeof(struct branch_entry);
1721
1722 OVERFLOW_CHECK_u64(array);
1723 data->branch_stack = (struct branch_stack *)array++;
1724
1725 if (data->branch_stack->nr > max_branch_nr)
1726 return -EFAULT;
1727 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1728 OVERFLOW_CHECK(array, sz, max_size);
1729 array = (void *)array + sz;
1730 }
1731
1732 if (type & PERF_SAMPLE_REGS_USER) {
1733 OVERFLOW_CHECK_u64(array);
1734 data->user_regs.abi = *array;
1735 array++;
1736
1737 if (data->user_regs.abi) {
1738 u64 mask = evsel->attr.sample_regs_user;
1739
1740 sz = hweight_long(mask) * sizeof(u64);
1741 OVERFLOW_CHECK(array, sz, max_size);
1742 data->user_regs.mask = mask;
1743 data->user_regs.regs = (u64 *)array;
1744 array = (void *)array + sz;
1745 }
1746 }
1747
1748 if (type & PERF_SAMPLE_STACK_USER) {
1749 OVERFLOW_CHECK_u64(array);
1750 sz = *array++;
1751
1752 data->user_stack.offset = ((char *)(array - 1)
1753 - (char *) event);
1754
1755 if (!sz) {
1756 data->user_stack.size = 0;
1757 } else {
1758 OVERFLOW_CHECK(array, sz, max_size);
1759 data->user_stack.data = (char *)array;
1760 array = (void *)array + sz;
1761 OVERFLOW_CHECK_u64(array);
1762 data->user_stack.size = *array++;
1763 if (WARN_ONCE(data->user_stack.size > sz,
1764 "user stack dump failure\n"))
1765 return -EFAULT;
1766 }
1767 }
1768
1769 data->weight = 0;
1770 if (type & PERF_SAMPLE_WEIGHT) {
1771 OVERFLOW_CHECK_u64(array);
1772 data->weight = *array;
1773 array++;
1774 }
1775
1776 data->data_src = PERF_MEM_DATA_SRC_NONE;
1777 if (type & PERF_SAMPLE_DATA_SRC) {
1778 OVERFLOW_CHECK_u64(array);
1779 data->data_src = *array;
1780 array++;
1781 }
1782
1783 data->transaction = 0;
1784 if (type & PERF_SAMPLE_TRANSACTION) {
1785 OVERFLOW_CHECK_u64(array);
1786 data->transaction = *array;
1787 array++;
1788 }
1789
1790 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1791 if (type & PERF_SAMPLE_REGS_INTR) {
1792 OVERFLOW_CHECK_u64(array);
1793 data->intr_regs.abi = *array;
1794 array++;
1795
1796 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1797 u64 mask = evsel->attr.sample_regs_intr;
1798
1799 sz = hweight_long(mask) * sizeof(u64);
1800 OVERFLOW_CHECK(array, sz, max_size);
1801 data->intr_regs.mask = mask;
1802 data->intr_regs.regs = (u64 *)array;
1803 array = (void *)array + sz;
1804 }
1805 }
1806
1807 return 0;
1808 }
1809
1810 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1811 u64 read_format)
1812 {
1813 size_t sz, result = sizeof(struct sample_event);
1814
1815 if (type & PERF_SAMPLE_IDENTIFIER)
1816 result += sizeof(u64);
1817
1818 if (type & PERF_SAMPLE_IP)
1819 result += sizeof(u64);
1820
1821 if (type & PERF_SAMPLE_TID)
1822 result += sizeof(u64);
1823
1824 if (type & PERF_SAMPLE_TIME)
1825 result += sizeof(u64);
1826
1827 if (type & PERF_SAMPLE_ADDR)
1828 result += sizeof(u64);
1829
1830 if (type & PERF_SAMPLE_ID)
1831 result += sizeof(u64);
1832
1833 if (type & PERF_SAMPLE_STREAM_ID)
1834 result += sizeof(u64);
1835
1836 if (type & PERF_SAMPLE_CPU)
1837 result += sizeof(u64);
1838
1839 if (type & PERF_SAMPLE_PERIOD)
1840 result += sizeof(u64);
1841
1842 if (type & PERF_SAMPLE_READ) {
1843 result += sizeof(u64);
1844 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1845 result += sizeof(u64);
1846 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1847 result += sizeof(u64);
1848 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1849 if (read_format & PERF_FORMAT_GROUP) {
1850 sz = sample->read.group.nr *
1851 sizeof(struct sample_read_value);
1852 result += sz;
1853 } else {
1854 result += sizeof(u64);
1855 }
1856 }
1857
1858 if (type & PERF_SAMPLE_CALLCHAIN) {
1859 sz = (sample->callchain->nr + 1) * sizeof(u64);
1860 result += sz;
1861 }
1862
1863 if (type & PERF_SAMPLE_RAW) {
1864 result += sizeof(u32);
1865 result += sample->raw_size;
1866 }
1867
1868 if (type & PERF_SAMPLE_BRANCH_STACK) {
1869 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1870 sz += sizeof(u64);
1871 result += sz;
1872 }
1873
1874 if (type & PERF_SAMPLE_REGS_USER) {
1875 if (sample->user_regs.abi) {
1876 result += sizeof(u64);
1877 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1878 result += sz;
1879 } else {
1880 result += sizeof(u64);
1881 }
1882 }
1883
1884 if (type & PERF_SAMPLE_STACK_USER) {
1885 sz = sample->user_stack.size;
1886 result += sizeof(u64);
1887 if (sz) {
1888 result += sz;
1889 result += sizeof(u64);
1890 }
1891 }
1892
1893 if (type & PERF_SAMPLE_WEIGHT)
1894 result += sizeof(u64);
1895
1896 if (type & PERF_SAMPLE_DATA_SRC)
1897 result += sizeof(u64);
1898
1899 if (type & PERF_SAMPLE_TRANSACTION)
1900 result += sizeof(u64);
1901
1902 if (type & PERF_SAMPLE_REGS_INTR) {
1903 if (sample->intr_regs.abi) {
1904 result += sizeof(u64);
1905 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1906 result += sz;
1907 } else {
1908 result += sizeof(u64);
1909 }
1910 }
1911
1912 return result;
1913 }
1914
1915 int perf_event__synthesize_sample(union perf_event *event, u64 type,
1916 u64 read_format,
1917 const struct perf_sample *sample,
1918 bool swapped)
1919 {
1920 u64 *array;
1921 size_t sz;
1922 /*
1923 * used for cross-endian analysis. See git commit 65014ab3
1924 * for why this goofiness is needed.
1925 */
1926 union u64_swap u;
1927
1928 array = event->sample.array;
1929
1930 if (type & PERF_SAMPLE_IDENTIFIER) {
1931 *array = sample->id;
1932 array++;
1933 }
1934
1935 if (type & PERF_SAMPLE_IP) {
1936 *array = sample->ip;
1937 array++;
1938 }
1939
1940 if (type & PERF_SAMPLE_TID) {
1941 u.val32[0] = sample->pid;
1942 u.val32[1] = sample->tid;
1943 if (swapped) {
1944 /*
1945 * Inverse of what is done in perf_evsel__parse_sample
1946 */
1947 u.val32[0] = bswap_32(u.val32[0]);
1948 u.val32[1] = bswap_32(u.val32[1]);
1949 u.val64 = bswap_64(u.val64);
1950 }
1951
1952 *array = u.val64;
1953 array++;
1954 }
1955
1956 if (type & PERF_SAMPLE_TIME) {
1957 *array = sample->time;
1958 array++;
1959 }
1960
1961 if (type & PERF_SAMPLE_ADDR) {
1962 *array = sample->addr;
1963 array++;
1964 }
1965
1966 if (type & PERF_SAMPLE_ID) {
1967 *array = sample->id;
1968 array++;
1969 }
1970
1971 if (type & PERF_SAMPLE_STREAM_ID) {
1972 *array = sample->stream_id;
1973 array++;
1974 }
1975
1976 if (type & PERF_SAMPLE_CPU) {
1977 u.val32[0] = sample->cpu;
1978 if (swapped) {
1979 /*
1980 * Inverse of what is done in perf_evsel__parse_sample
1981 */
1982 u.val32[0] = bswap_32(u.val32[0]);
1983 u.val64 = bswap_64(u.val64);
1984 }
1985 *array = u.val64;
1986 array++;
1987 }
1988
1989 if (type & PERF_SAMPLE_PERIOD) {
1990 *array = sample->period;
1991 array++;
1992 }
1993
1994 if (type & PERF_SAMPLE_READ) {
1995 if (read_format & PERF_FORMAT_GROUP)
1996 *array = sample->read.group.nr;
1997 else
1998 *array = sample->read.one.value;
1999 array++;
2000
2001 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2002 *array = sample->read.time_enabled;
2003 array++;
2004 }
2005
2006 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2007 *array = sample->read.time_running;
2008 array++;
2009 }
2010
2011 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2012 if (read_format & PERF_FORMAT_GROUP) {
2013 sz = sample->read.group.nr *
2014 sizeof(struct sample_read_value);
2015 memcpy(array, sample->read.group.values, sz);
2016 array = (void *)array + sz;
2017 } else {
2018 *array = sample->read.one.id;
2019 array++;
2020 }
2021 }
2022
2023 if (type & PERF_SAMPLE_CALLCHAIN) {
2024 sz = (sample->callchain->nr + 1) * sizeof(u64);
2025 memcpy(array, sample->callchain, sz);
2026 array = (void *)array + sz;
2027 }
2028
2029 if (type & PERF_SAMPLE_RAW) {
2030 u.val32[0] = sample->raw_size;
2031 if (WARN_ONCE(swapped,
2032 "Endianness of raw data not corrected!\n")) {
2033 /*
2034 * Inverse of what is done in perf_evsel__parse_sample
2035 */
2036 u.val32[0] = bswap_32(u.val32[0]);
2037 u.val32[1] = bswap_32(u.val32[1]);
2038 u.val64 = bswap_64(u.val64);
2039 }
2040 *array = u.val64;
2041 array = (void *)array + sizeof(u32);
2042
2043 memcpy(array, sample->raw_data, sample->raw_size);
2044 array = (void *)array + sample->raw_size;
2045 }
2046
2047 if (type & PERF_SAMPLE_BRANCH_STACK) {
2048 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2049 sz += sizeof(u64);
2050 memcpy(array, sample->branch_stack, sz);
2051 array = (void *)array + sz;
2052 }
2053
2054 if (type & PERF_SAMPLE_REGS_USER) {
2055 if (sample->user_regs.abi) {
2056 *array++ = sample->user_regs.abi;
2057 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2058 memcpy(array, sample->user_regs.regs, sz);
2059 array = (void *)array + sz;
2060 } else {
2061 *array++ = 0;
2062 }
2063 }
2064
2065 if (type & PERF_SAMPLE_STACK_USER) {
2066 sz = sample->user_stack.size;
2067 *array++ = sz;
2068 if (sz) {
2069 memcpy(array, sample->user_stack.data, sz);
2070 array = (void *)array + sz;
2071 *array++ = sz;
2072 }
2073 }
2074
2075 if (type & PERF_SAMPLE_WEIGHT) {
2076 *array = sample->weight;
2077 array++;
2078 }
2079
2080 if (type & PERF_SAMPLE_DATA_SRC) {
2081 *array = sample->data_src;
2082 array++;
2083 }
2084
2085 if (type & PERF_SAMPLE_TRANSACTION) {
2086 *array = sample->transaction;
2087 array++;
2088 }
2089
2090 if (type & PERF_SAMPLE_REGS_INTR) {
2091 if (sample->intr_regs.abi) {
2092 *array++ = sample->intr_regs.abi;
2093 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2094 memcpy(array, sample->intr_regs.regs, sz);
2095 array = (void *)array + sz;
2096 } else {
2097 *array++ = 0;
2098 }
2099 }
2100
2101 return 0;
2102 }
2103
2104 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2105 {
2106 return pevent_find_field(evsel->tp_format, name);
2107 }
2108
2109 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2110 const char *name)
2111 {
2112 struct format_field *field = perf_evsel__field(evsel, name);
2113 int offset;
2114
2115 if (!field)
2116 return NULL;
2117
2118 offset = field->offset;
2119
2120 if (field->flags & FIELD_IS_DYNAMIC) {
2121 offset = *(int *)(sample->raw_data + field->offset);
2122 offset &= 0xffff;
2123 }
2124
2125 return sample->raw_data + offset;
2126 }
2127
2128 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2129 const char *name)
2130 {
2131 struct format_field *field = perf_evsel__field(evsel, name);
2132 void *ptr;
2133 u64 value;
2134
2135 if (!field)
2136 return 0;
2137
2138 ptr = sample->raw_data + field->offset;
2139
2140 switch (field->size) {
2141 case 1:
2142 return *(u8 *)ptr;
2143 case 2:
2144 value = *(u16 *)ptr;
2145 break;
2146 case 4:
2147 value = *(u32 *)ptr;
2148 break;
2149 case 8:
2150 memcpy(&value, ptr, sizeof(u64));
2151 break;
2152 default:
2153 return 0;
2154 }
2155
2156 if (!evsel->needs_swap)
2157 return value;
2158
2159 switch (field->size) {
2160 case 2:
2161 return bswap_16(value);
2162 case 4:
2163 return bswap_32(value);
2164 case 8:
2165 return bswap_64(value);
2166 default:
2167 return 0;
2168 }
2169
2170 return 0;
2171 }
2172
2173 static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
2174 {
2175 va_list args;
2176 int ret = 0;
2177
2178 if (!*first) {
2179 ret += fprintf(fp, ",");
2180 } else {
2181 ret += fprintf(fp, ":");
2182 *first = false;
2183 }
2184
2185 va_start(args, fmt);
2186 ret += vfprintf(fp, fmt, args);
2187 va_end(args);
2188 return ret;
2189 }
2190
2191 static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv)
2192 {
2193 return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val);
2194 }
2195
2196 int perf_evsel__fprintf(struct perf_evsel *evsel,
2197 struct perf_attr_details *details, FILE *fp)
2198 {
2199 bool first = true;
2200 int printed = 0;
2201
2202 if (details->event_group) {
2203 struct perf_evsel *pos;
2204
2205 if (!perf_evsel__is_group_leader(evsel))
2206 return 0;
2207
2208 if (evsel->nr_members > 1)
2209 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2210
2211 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2212 for_each_group_member(pos, evsel)
2213 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2214
2215 if (evsel->nr_members > 1)
2216 printed += fprintf(fp, "}");
2217 goto out;
2218 }
2219
2220 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2221
2222 if (details->verbose) {
2223 printed += perf_event_attr__fprintf(fp, &evsel->attr,
2224 __print_attr__fprintf, &first);
2225 } else if (details->freq) {
2226 const char *term = "sample_freq";
2227
2228 if (!evsel->attr.freq)
2229 term = "sample_period";
2230
2231 printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
2232 term, (u64)evsel->attr.sample_freq);
2233 }
2234 out:
2235 fputc('\n', fp);
2236 return ++printed;
2237 }
2238
2239 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2240 char *msg, size_t msgsize)
2241 {
2242 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2243 evsel->attr.type == PERF_TYPE_HARDWARE &&
2244 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2245 /*
2246 * If it's cycles then fall back to hrtimer based
2247 * cpu-clock-tick sw counter, which is always available even if
2248 * no PMU support.
2249 *
2250 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2251 * b0a873e).
2252 */
2253 scnprintf(msg, msgsize, "%s",
2254 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2255
2256 evsel->attr.type = PERF_TYPE_SOFTWARE;
2257 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2258
2259 zfree(&evsel->name);
2260 return true;
2261 }
2262
2263 return false;
2264 }
2265
2266 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2267 int err, char *msg, size_t size)
2268 {
2269 char sbuf[STRERR_BUFSIZE];
2270
2271 switch (err) {
2272 case EPERM:
2273 case EACCES:
2274 return scnprintf(msg, size,
2275 "You may not have permission to collect %sstats.\n"
2276 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
2277 " -1 - Not paranoid at all\n"
2278 " 0 - Disallow raw tracepoint access for unpriv\n"
2279 " 1 - Disallow cpu events for unpriv\n"
2280 " 2 - Disallow kernel profiling for unpriv",
2281 target->system_wide ? "system-wide " : "");
2282 case ENOENT:
2283 return scnprintf(msg, size, "The %s event is not supported.",
2284 perf_evsel__name(evsel));
2285 case EMFILE:
2286 return scnprintf(msg, size, "%s",
2287 "Too many events are opened.\n"
2288 "Probably the maximum number of open file descriptors has been reached.\n"
2289 "Hint: Try again after reducing the number of events.\n"
2290 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2291 case ENODEV:
2292 if (target->cpu_list)
2293 return scnprintf(msg, size, "%s",
2294 "No such device - did you specify an out-of-range profile CPU?\n");
2295 break;
2296 case EOPNOTSUPP:
2297 if (evsel->attr.precise_ip)
2298 return scnprintf(msg, size, "%s",
2299 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2300 #if defined(__i386__) || defined(__x86_64__)
2301 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2302 return scnprintf(msg, size, "%s",
2303 "No hardware sampling interrupt available.\n"
2304 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2305 #endif
2306 break;
2307 case EBUSY:
2308 if (find_process("oprofiled"))
2309 return scnprintf(msg, size,
2310 "The PMU counters are busy/taken by another profiler.\n"
2311 "We found oprofile daemon running, please stop it and try again.");
2312 break;
2313 case EINVAL:
2314 if (perf_missing_features.clockid)
2315 return scnprintf(msg, size, "clockid feature not supported.");
2316 if (perf_missing_features.clockid_wrong)
2317 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2318 break;
2319 default:
2320 break;
2321 }
2322
2323 return scnprintf(msg, size,
2324 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2325 "/bin/dmesg may provide additional information.\n"
2326 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2327 err, strerror_r(err, sbuf, sizeof(sbuf)),
2328 perf_evsel__name(evsel));
2329 }
Linux with added FPC-III support