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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/tracing_path.h>
13#include <traceevent/event-parse.h>
14#include <linux/hw_breakpoint.h>
15#include <linux/perf_event.h>
16#include <linux/err.h>
17#include <sys/resource.h>
18#include "asm/bug.h"
19#include "callchain.h"
20#include "cgroup.h"
21#include "evsel.h"
22#include "evlist.h"
23#include "util.h"
24#include "cpumap.h"
25#include "thread_map.h"
26#include "target.h"
27#include "perf_regs.h"
28#include "debug.h"
29#include "trace-event.h"
30#include "stat.h"
31
32static struct {
33 bool sample_id_all;
34 bool exclude_guest;
35 bool mmap2;
36 bool cloexec;
37 bool clockid;
38 bool clockid_wrong;
39 bool lbr_flags;
40} perf_missing_features;
41
42static clockid_t clockid;
43
44static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
45{
46 return 0;
47}
48
49static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
50{
51}
52
53static struct {
54 size_t size;
55 int (*init)(struct perf_evsel *evsel);
56 void (*fini)(struct perf_evsel *evsel);
57} perf_evsel__object = {
58 .size = sizeof(struct perf_evsel),
59 .init = perf_evsel__no_extra_init,
60 .fini = perf_evsel__no_extra_fini,
61};
62
63int perf_evsel__object_config(size_t object_size,
64 int (*init)(struct perf_evsel *evsel),
65 void (*fini)(struct perf_evsel *evsel))
66{
67
68 if (object_size == 0)
69 goto set_methods;
70
71 if (perf_evsel__object.size > object_size)
72 return -EINVAL;
73
74 perf_evsel__object.size = object_size;
75
76set_methods:
77 if (init != NULL)
78 perf_evsel__object.init = init;
79
80 if (fini != NULL)
81 perf_evsel__object.fini = fini;
82
83 return 0;
84}
85
86#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
87
88int __perf_evsel__sample_size(u64 sample_type)
89{
90 u64 mask = sample_type & PERF_SAMPLE_MASK;
91 int size = 0;
92 int i;
93
94 for (i = 0; i < 64; i++) {
95 if (mask & (1ULL << i))
96 size++;
97 }
98
99 size *= sizeof(u64);
100
101 return size;
102}
103
104/**
105 * __perf_evsel__calc_id_pos - calculate id_pos.
106 * @sample_type: sample type
107 *
108 * This function returns the position of the event id (PERF_SAMPLE_ID or
109 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
110 * sample_event.
111 */
112static int __perf_evsel__calc_id_pos(u64 sample_type)
113{
114 int idx = 0;
115
116 if (sample_type & PERF_SAMPLE_IDENTIFIER)
117 return 0;
118
119 if (!(sample_type & PERF_SAMPLE_ID))
120 return -1;
121
122 if (sample_type & PERF_SAMPLE_IP)
123 idx += 1;
124
125 if (sample_type & PERF_SAMPLE_TID)
126 idx += 1;
127
128 if (sample_type & PERF_SAMPLE_TIME)
129 idx += 1;
130
131 if (sample_type & PERF_SAMPLE_ADDR)
132 idx += 1;
133
134 return idx;
135}
136
137/**
138 * __perf_evsel__calc_is_pos - calculate is_pos.
139 * @sample_type: sample type
140 *
141 * This function returns the position (counting backwards) of the event id
142 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
143 * sample_id_all is used there is an id sample appended to non-sample events.
144 */
145static int __perf_evsel__calc_is_pos(u64 sample_type)
146{
147 int idx = 1;
148
149 if (sample_type & PERF_SAMPLE_IDENTIFIER)
150 return 1;
151
152 if (!(sample_type & PERF_SAMPLE_ID))
153 return -1;
154
155 if (sample_type & PERF_SAMPLE_CPU)
156 idx += 1;
157
158 if (sample_type & PERF_SAMPLE_STREAM_ID)
159 idx += 1;
160
161 return idx;
162}
163
164void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
165{
166 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
167 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
168}
169
170void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
171 enum perf_event_sample_format bit)
172{
173 if (!(evsel->attr.sample_type & bit)) {
174 evsel->attr.sample_type |= bit;
175 evsel->sample_size += sizeof(u64);
176 perf_evsel__calc_id_pos(evsel);
177 }
178}
179
180void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
181 enum perf_event_sample_format bit)
182{
183 if (evsel->attr.sample_type & bit) {
184 evsel->attr.sample_type &= ~bit;
185 evsel->sample_size -= sizeof(u64);
186 perf_evsel__calc_id_pos(evsel);
187 }
188}
189
190void perf_evsel__set_sample_id(struct perf_evsel *evsel,
191 bool can_sample_identifier)
192{
193 if (can_sample_identifier) {
194 perf_evsel__reset_sample_bit(evsel, ID);
195 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
196 } else {
197 perf_evsel__set_sample_bit(evsel, ID);
198 }
199 evsel->attr.read_format |= PERF_FORMAT_ID;
200}
201
202void perf_evsel__init(struct perf_evsel *evsel,
203 struct perf_event_attr *attr, int idx)
204{
205 evsel->idx = idx;
206 evsel->tracking = !idx;
207 evsel->attr = *attr;
208 evsel->leader = evsel;
209 evsel->unit = "";
210 evsel->scale = 1.0;
211 evsel->evlist = NULL;
212 evsel->bpf_fd = -1;
213 INIT_LIST_HEAD(&evsel->node);
214 INIT_LIST_HEAD(&evsel->config_terms);
215 perf_evsel__object.init(evsel);
216 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
217 perf_evsel__calc_id_pos(evsel);
218 evsel->cmdline_group_boundary = false;
219}
220
221struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
222{
223 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
224
225 if (evsel != NULL)
226 perf_evsel__init(evsel, attr, idx);
227
228 if (perf_evsel__is_bpf_output(evsel)) {
229 evsel->attr.sample_type |= PERF_SAMPLE_RAW;
230 evsel->attr.sample_period = 1;
231 }
232
233 return evsel;
234}
235
236/*
237 * Returns pointer with encoded error via <linux/err.h> interface.
238 */
239struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
240{
241 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
242 int err = -ENOMEM;
243
244 if (evsel == NULL) {
245 goto out_err;
246 } else {
247 struct perf_event_attr attr = {
248 .type = PERF_TYPE_TRACEPOINT,
249 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
250 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
251 };
252
253 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
254 goto out_free;
255
256 evsel->tp_format = trace_event__tp_format(sys, name);
257 if (IS_ERR(evsel->tp_format)) {
258 err = PTR_ERR(evsel->tp_format);
259 goto out_free;
260 }
261
262 event_attr_init(&attr);
263 attr.config = evsel->tp_format->id;
264 attr.sample_period = 1;
265 perf_evsel__init(evsel, &attr, idx);
266 }
267
268 return evsel;
269
270out_free:
271 zfree(&evsel->name);
272 free(evsel);
273out_err:
274 return ERR_PTR(err);
275}
276
277const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
278 "cycles",
279 "instructions",
280 "cache-references",
281 "cache-misses",
282 "branches",
283 "branch-misses",
284 "bus-cycles",
285 "stalled-cycles-frontend",
286 "stalled-cycles-backend",
287 "ref-cycles",
288};
289
290static const char *__perf_evsel__hw_name(u64 config)
291{
292 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
293 return perf_evsel__hw_names[config];
294
295 return "unknown-hardware";
296}
297
298static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
299{
300 int colon = 0, r = 0;
301 struct perf_event_attr *attr = &evsel->attr;
302 bool exclude_guest_default = false;
303
304#define MOD_PRINT(context, mod) do { \
305 if (!attr->exclude_##context) { \
306 if (!colon) colon = ++r; \
307 r += scnprintf(bf + r, size - r, "%c", mod); \
308 } } while(0)
309
310 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
311 MOD_PRINT(kernel, 'k');
312 MOD_PRINT(user, 'u');
313 MOD_PRINT(hv, 'h');
314 exclude_guest_default = true;
315 }
316
317 if (attr->precise_ip) {
318 if (!colon)
319 colon = ++r;
320 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
321 exclude_guest_default = true;
322 }
323
324 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
325 MOD_PRINT(host, 'H');
326 MOD_PRINT(guest, 'G');
327 }
328#undef MOD_PRINT
329 if (colon)
330 bf[colon - 1] = ':';
331 return r;
332}
333
334static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
335{
336 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
337 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
338}
339
340const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
341 "cpu-clock",
342 "task-clock",
343 "page-faults",
344 "context-switches",
345 "cpu-migrations",
346 "minor-faults",
347 "major-faults",
348 "alignment-faults",
349 "emulation-faults",
350 "dummy",
351};
352
353static const char *__perf_evsel__sw_name(u64 config)
354{
355 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
356 return perf_evsel__sw_names[config];
357 return "unknown-software";
358}
359
360static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
361{
362 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
363 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
364}
365
366static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
367{
368 int r;
369
370 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
371
372 if (type & HW_BREAKPOINT_R)
373 r += scnprintf(bf + r, size - r, "r");
374
375 if (type & HW_BREAKPOINT_W)
376 r += scnprintf(bf + r, size - r, "w");
377
378 if (type & HW_BREAKPOINT_X)
379 r += scnprintf(bf + r, size - r, "x");
380
381 return r;
382}
383
384static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
385{
386 struct perf_event_attr *attr = &evsel->attr;
387 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
388 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
389}
390
391const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
392 [PERF_EVSEL__MAX_ALIASES] = {
393 { "L1-dcache", "l1-d", "l1d", "L1-data", },
394 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
395 { "LLC", "L2", },
396 { "dTLB", "d-tlb", "Data-TLB", },
397 { "iTLB", "i-tlb", "Instruction-TLB", },
398 { "branch", "branches", "bpu", "btb", "bpc", },
399 { "node", },
400};
401
402const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
403 [PERF_EVSEL__MAX_ALIASES] = {
404 { "load", "loads", "read", },
405 { "store", "stores", "write", },
406 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
407};
408
409const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
410 [PERF_EVSEL__MAX_ALIASES] = {
411 { "refs", "Reference", "ops", "access", },
412 { "misses", "miss", },
413};
414
415#define C(x) PERF_COUNT_HW_CACHE_##x
416#define CACHE_READ (1 << C(OP_READ))
417#define CACHE_WRITE (1 << C(OP_WRITE))
418#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
419#define COP(x) (1 << x)
420
421/*
422 * cache operartion stat
423 * L1I : Read and prefetch only
424 * ITLB and BPU : Read-only
425 */
426static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
427 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
428 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
429 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
430 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
431 [C(ITLB)] = (CACHE_READ),
432 [C(BPU)] = (CACHE_READ),
433 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
434};
435
436bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
437{
438 if (perf_evsel__hw_cache_stat[type] & COP(op))
439 return true; /* valid */
440 else
441 return false; /* invalid */
442}
443
444int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
445 char *bf, size_t size)
446{
447 if (result) {
448 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
449 perf_evsel__hw_cache_op[op][0],
450 perf_evsel__hw_cache_result[result][0]);
451 }
452
453 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
454 perf_evsel__hw_cache_op[op][1]);
455}
456
457static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
458{
459 u8 op, result, type = (config >> 0) & 0xff;
460 const char *err = "unknown-ext-hardware-cache-type";
461
462 if (type > PERF_COUNT_HW_CACHE_MAX)
463 goto out_err;
464
465 op = (config >> 8) & 0xff;
466 err = "unknown-ext-hardware-cache-op";
467 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
468 goto out_err;
469
470 result = (config >> 16) & 0xff;
471 err = "unknown-ext-hardware-cache-result";
472 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
473 goto out_err;
474
475 err = "invalid-cache";
476 if (!perf_evsel__is_cache_op_valid(type, op))
477 goto out_err;
478
479 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
480out_err:
481 return scnprintf(bf, size, "%s", err);
482}
483
484static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
485{
486 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
487 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
488}
489
490static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
491{
492 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
493 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
494}
495
496const char *perf_evsel__name(struct perf_evsel *evsel)
497{
498 char bf[128];
499
500 if (evsel->name)
501 return evsel->name;
502
503 switch (evsel->attr.type) {
504 case PERF_TYPE_RAW:
505 perf_evsel__raw_name(evsel, bf, sizeof(bf));
506 break;
507
508 case PERF_TYPE_HARDWARE:
509 perf_evsel__hw_name(evsel, bf, sizeof(bf));
510 break;
511
512 case PERF_TYPE_HW_CACHE:
513 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
514 break;
515
516 case PERF_TYPE_SOFTWARE:
517 perf_evsel__sw_name(evsel, bf, sizeof(bf));
518 break;
519
520 case PERF_TYPE_TRACEPOINT:
521 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
522 break;
523
524 case PERF_TYPE_BREAKPOINT:
525 perf_evsel__bp_name(evsel, bf, sizeof(bf));
526 break;
527
528 default:
529 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
530 evsel->attr.type);
531 break;
532 }
533
534 evsel->name = strdup(bf);
535
536 return evsel->name ?: "unknown";
537}
538
539const char *perf_evsel__group_name(struct perf_evsel *evsel)
540{
541 return evsel->group_name ?: "anon group";
542}
543
544int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
545{
546 int ret;
547 struct perf_evsel *pos;
548 const char *group_name = perf_evsel__group_name(evsel);
549
550 ret = scnprintf(buf, size, "%s", group_name);
551
552 ret += scnprintf(buf + ret, size - ret, " { %s",
553 perf_evsel__name(evsel));
554
555 for_each_group_member(pos, evsel)
556 ret += scnprintf(buf + ret, size - ret, ", %s",
557 perf_evsel__name(pos));
558
559 ret += scnprintf(buf + ret, size - ret, " }");
560
561 return ret;
562}
563
564static void
565perf_evsel__config_callgraph(struct perf_evsel *evsel,
566 struct record_opts *opts,
567 struct callchain_param *param)
568{
569 bool function = perf_evsel__is_function_event(evsel);
570 struct perf_event_attr *attr = &evsel->attr;
571
572 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
573
574 if (param->record_mode == CALLCHAIN_LBR) {
575 if (!opts->branch_stack) {
576 if (attr->exclude_user) {
577 pr_warning("LBR callstack option is only available "
578 "to get user callchain information. "
579 "Falling back to framepointers.\n");
580 } else {
581 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
582 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
583 PERF_SAMPLE_BRANCH_CALL_STACK |
584 PERF_SAMPLE_BRANCH_NO_CYCLES |
585 PERF_SAMPLE_BRANCH_NO_FLAGS;
586 }
587 } else
588 pr_warning("Cannot use LBR callstack with branch stack. "
589 "Falling back to framepointers.\n");
590 }
591
592 if (param->record_mode == CALLCHAIN_DWARF) {
593 if (!function) {
594 perf_evsel__set_sample_bit(evsel, REGS_USER);
595 perf_evsel__set_sample_bit(evsel, STACK_USER);
596 attr->sample_regs_user = PERF_REGS_MASK;
597 attr->sample_stack_user = param->dump_size;
598 attr->exclude_callchain_user = 1;
599 } else {
600 pr_info("Cannot use DWARF unwind for function trace event,"
601 " falling back to framepointers.\n");
602 }
603 }
604
605 if (function) {
606 pr_info("Disabling user space callchains for function trace event.\n");
607 attr->exclude_callchain_user = 1;
608 }
609}
610
611static void
612perf_evsel__reset_callgraph(struct perf_evsel *evsel,
613 struct callchain_param *param)
614{
615 struct perf_event_attr *attr = &evsel->attr;
616
617 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
618 if (param->record_mode == CALLCHAIN_LBR) {
619 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
620 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
621 PERF_SAMPLE_BRANCH_CALL_STACK);
622 }
623 if (param->record_mode == CALLCHAIN_DWARF) {
624 perf_evsel__reset_sample_bit(evsel, REGS_USER);
625 perf_evsel__reset_sample_bit(evsel, STACK_USER);
626 }
627}
628
629static void apply_config_terms(struct perf_evsel *evsel,
630 struct record_opts *opts)
631{
632 struct perf_evsel_config_term *term;
633 struct list_head *config_terms = &evsel->config_terms;
634 struct perf_event_attr *attr = &evsel->attr;
635 struct callchain_param param;
636 u32 dump_size = 0;
637 char *callgraph_buf = NULL;
638
639 /* callgraph default */
640 param.record_mode = callchain_param.record_mode;
641
642 list_for_each_entry(term, config_terms, list) {
643 switch (term->type) {
644 case PERF_EVSEL__CONFIG_TERM_PERIOD:
645 attr->sample_period = term->val.period;
646 attr->freq = 0;
647 break;
648 case PERF_EVSEL__CONFIG_TERM_FREQ:
649 attr->sample_freq = term->val.freq;
650 attr->freq = 1;
651 break;
652 case PERF_EVSEL__CONFIG_TERM_TIME:
653 if (term->val.time)
654 perf_evsel__set_sample_bit(evsel, TIME);
655 else
656 perf_evsel__reset_sample_bit(evsel, TIME);
657 break;
658 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
659 callgraph_buf = term->val.callgraph;
660 break;
661 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
662 dump_size = term->val.stack_user;
663 break;
664 case PERF_EVSEL__CONFIG_TERM_INHERIT:
665 /*
666 * attr->inherit should has already been set by
667 * perf_evsel__config. If user explicitly set
668 * inherit using config terms, override global
669 * opt->no_inherit setting.
670 */
671 attr->inherit = term->val.inherit ? 1 : 0;
672 break;
673 default:
674 break;
675 }
676 }
677
678 /* User explicitly set per-event callgraph, clear the old setting and reset. */
679 if ((callgraph_buf != NULL) || (dump_size > 0)) {
680
681 /* parse callgraph parameters */
682 if (callgraph_buf != NULL) {
683 if (!strcmp(callgraph_buf, "no")) {
684 param.enabled = false;
685 param.record_mode = CALLCHAIN_NONE;
686 } else {
687 param.enabled = true;
688 if (parse_callchain_record(callgraph_buf, ¶m)) {
689 pr_err("per-event callgraph setting for %s failed. "
690 "Apply callgraph global setting for it\n",
691 evsel->name);
692 return;
693 }
694 }
695 }
696 if (dump_size > 0) {
697 dump_size = round_up(dump_size, sizeof(u64));
698 param.dump_size = dump_size;
699 }
700
701 /* If global callgraph set, clear it */
702 if (callchain_param.enabled)
703 perf_evsel__reset_callgraph(evsel, &callchain_param);
704
705 /* set perf-event callgraph */
706 if (param.enabled)
707 perf_evsel__config_callgraph(evsel, opts, ¶m);
708 }
709}
710
711/*
712 * The enable_on_exec/disabled value strategy:
713 *
714 * 1) For any type of traced program:
715 * - all independent events and group leaders are disabled
716 * - all group members are enabled
717 *
718 * Group members are ruled by group leaders. They need to
719 * be enabled, because the group scheduling relies on that.
720 *
721 * 2) For traced programs executed by perf:
722 * - all independent events and group leaders have
723 * enable_on_exec set
724 * - we don't specifically enable or disable any event during
725 * the record command
726 *
727 * Independent events and group leaders are initially disabled
728 * and get enabled by exec. Group members are ruled by group
729 * leaders as stated in 1).
730 *
731 * 3) For traced programs attached by perf (pid/tid):
732 * - we specifically enable or disable all events during
733 * the record command
734 *
735 * When attaching events to already running traced we
736 * enable/disable events specifically, as there's no
737 * initial traced exec call.
738 */
739void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
740{
741 struct perf_evsel *leader = evsel->leader;
742 struct perf_event_attr *attr = &evsel->attr;
743 int track = evsel->tracking;
744 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
745
746 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
747 attr->inherit = !opts->no_inherit;
748
749 perf_evsel__set_sample_bit(evsel, IP);
750 perf_evsel__set_sample_bit(evsel, TID);
751
752 if (evsel->sample_read) {
753 perf_evsel__set_sample_bit(evsel, READ);
754
755 /*
756 * We need ID even in case of single event, because
757 * PERF_SAMPLE_READ process ID specific data.
758 */
759 perf_evsel__set_sample_id(evsel, false);
760
761 /*
762 * Apply group format only if we belong to group
763 * with more than one members.
764 */
765 if (leader->nr_members > 1) {
766 attr->read_format |= PERF_FORMAT_GROUP;
767 attr->inherit = 0;
768 }
769 }
770
771 /*
772 * We default some events to have a default interval. But keep
773 * it a weak assumption overridable by the user.
774 */
775 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
776 opts->user_interval != ULLONG_MAX)) {
777 if (opts->freq) {
778 perf_evsel__set_sample_bit(evsel, PERIOD);
779 attr->freq = 1;
780 attr->sample_freq = opts->freq;
781 } else {
782 attr->sample_period = opts->default_interval;
783 }
784 }
785
786 /*
787 * Disable sampling for all group members other
788 * than leader in case leader 'leads' the sampling.
789 */
790 if ((leader != evsel) && leader->sample_read) {
791 attr->sample_freq = 0;
792 attr->sample_period = 0;
793 }
794
795 if (opts->no_samples)
796 attr->sample_freq = 0;
797
798 if (opts->inherit_stat)
799 attr->inherit_stat = 1;
800
801 if (opts->sample_address) {
802 perf_evsel__set_sample_bit(evsel, ADDR);
803 attr->mmap_data = track;
804 }
805
806 /*
807 * We don't allow user space callchains for function trace
808 * event, due to issues with page faults while tracing page
809 * fault handler and its overall trickiness nature.
810 */
811 if (perf_evsel__is_function_event(evsel))
812 evsel->attr.exclude_callchain_user = 1;
813
814 if (callchain_param.enabled && !evsel->no_aux_samples)
815 perf_evsel__config_callgraph(evsel, opts, &callchain_param);
816
817 if (opts->sample_intr_regs) {
818 attr->sample_regs_intr = opts->sample_intr_regs;
819 perf_evsel__set_sample_bit(evsel, REGS_INTR);
820 }
821
822 if (target__has_cpu(&opts->target))
823 perf_evsel__set_sample_bit(evsel, CPU);
824
825 if (opts->period)
826 perf_evsel__set_sample_bit(evsel, PERIOD);
827
828 /*
829 * When the user explicitely disabled time don't force it here.
830 */
831 if (opts->sample_time &&
832 (!perf_missing_features.sample_id_all &&
833 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
834 opts->sample_time_set)))
835 perf_evsel__set_sample_bit(evsel, TIME);
836
837 if (opts->raw_samples && !evsel->no_aux_samples) {
838 perf_evsel__set_sample_bit(evsel, TIME);
839 perf_evsel__set_sample_bit(evsel, RAW);
840 perf_evsel__set_sample_bit(evsel, CPU);
841 }
842
843 if (opts->sample_address)
844 perf_evsel__set_sample_bit(evsel, DATA_SRC);
845
846 if (opts->no_buffering) {
847 attr->watermark = 0;
848 attr->wakeup_events = 1;
849 }
850 if (opts->branch_stack && !evsel->no_aux_samples) {
851 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
852 attr->branch_sample_type = opts->branch_stack;
853 }
854
855 if (opts->sample_weight)
856 perf_evsel__set_sample_bit(evsel, WEIGHT);
857
858 attr->task = track;
859 attr->mmap = track;
860 attr->mmap2 = track && !perf_missing_features.mmap2;
861 attr->comm = track;
862
863 if (opts->record_switch_events)
864 attr->context_switch = track;
865
866 if (opts->sample_transaction)
867 perf_evsel__set_sample_bit(evsel, TRANSACTION);
868
869 if (opts->running_time) {
870 evsel->attr.read_format |=
871 PERF_FORMAT_TOTAL_TIME_ENABLED |
872 PERF_FORMAT_TOTAL_TIME_RUNNING;
873 }
874
875 /*
876 * XXX see the function comment above
877 *
878 * Disabling only independent events or group leaders,
879 * keeping group members enabled.
880 */
881 if (perf_evsel__is_group_leader(evsel))
882 attr->disabled = 1;
883
884 /*
885 * Setting enable_on_exec for independent events and
886 * group leaders for traced executed by perf.
887 */
888 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
889 !opts->initial_delay)
890 attr->enable_on_exec = 1;
891
892 if (evsel->immediate) {
893 attr->disabled = 0;
894 attr->enable_on_exec = 0;
895 }
896
897 clockid = opts->clockid;
898 if (opts->use_clockid) {
899 attr->use_clockid = 1;
900 attr->clockid = opts->clockid;
901 }
902
903 if (evsel->precise_max)
904 perf_event_attr__set_max_precise_ip(attr);
905
906 if (opts->all_user) {
907 attr->exclude_kernel = 1;
908 attr->exclude_user = 0;
909 }
910
911 if (opts->all_kernel) {
912 attr->exclude_kernel = 0;
913 attr->exclude_user = 1;
914 }
915
916 /*
917 * Apply event specific term settings,
918 * it overloads any global configuration.
919 */
920 apply_config_terms(evsel, opts);
921}
922
923static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
924{
925 int cpu, thread;
926
927 if (evsel->system_wide)
928 nthreads = 1;
929
930 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
931
932 if (evsel->fd) {
933 for (cpu = 0; cpu < ncpus; cpu++) {
934 for (thread = 0; thread < nthreads; thread++) {
935 FD(evsel, cpu, thread) = -1;
936 }
937 }
938 }
939
940 return evsel->fd != NULL ? 0 : -ENOMEM;
941}
942
943static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
944 int ioc, void *arg)
945{
946 int cpu, thread;
947
948 if (evsel->system_wide)
949 nthreads = 1;
950
951 for (cpu = 0; cpu < ncpus; cpu++) {
952 for (thread = 0; thread < nthreads; thread++) {
953 int fd = FD(evsel, cpu, thread),
954 err = ioctl(fd, ioc, arg);
955
956 if (err)
957 return err;
958 }
959 }
960
961 return 0;
962}
963
964int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
965 const char *filter)
966{
967 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
968 PERF_EVENT_IOC_SET_FILTER,
969 (void *)filter);
970}
971
972int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
973{
974 char *new_filter = strdup(filter);
975
976 if (new_filter != NULL) {
977 free(evsel->filter);
978 evsel->filter = new_filter;
979 return 0;
980 }
981
982 return -1;
983}
984
985int perf_evsel__append_filter(struct perf_evsel *evsel,
986 const char *op, const char *filter)
987{
988 char *new_filter;
989
990 if (evsel->filter == NULL)
991 return perf_evsel__set_filter(evsel, filter);
992
993 if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
994 free(evsel->filter);
995 evsel->filter = new_filter;
996 return 0;
997 }
998
999 return -1;
1000}
1001
1002int perf_evsel__enable(struct perf_evsel *evsel)
1003{
1004 int nthreads = thread_map__nr(evsel->threads);
1005 int ncpus = cpu_map__nr(evsel->cpus);
1006
1007 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1008 PERF_EVENT_IOC_ENABLE,
1009 0);
1010}
1011
1012int perf_evsel__disable(struct perf_evsel *evsel)
1013{
1014 int nthreads = thread_map__nr(evsel->threads);
1015 int ncpus = cpu_map__nr(evsel->cpus);
1016
1017 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1018 PERF_EVENT_IOC_DISABLE,
1019 0);
1020}
1021
1022int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1023{
1024 if (ncpus == 0 || nthreads == 0)
1025 return 0;
1026
1027 if (evsel->system_wide)
1028 nthreads = 1;
1029
1030 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1031 if (evsel->sample_id == NULL)
1032 return -ENOMEM;
1033
1034 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1035 if (evsel->id == NULL) {
1036 xyarray__delete(evsel->sample_id);
1037 evsel->sample_id = NULL;
1038 return -ENOMEM;
1039 }
1040
1041 return 0;
1042}
1043
1044static void perf_evsel__free_fd(struct perf_evsel *evsel)
1045{
1046 xyarray__delete(evsel->fd);
1047 evsel->fd = NULL;
1048}
1049
1050static void perf_evsel__free_id(struct perf_evsel *evsel)
1051{
1052 xyarray__delete(evsel->sample_id);
1053 evsel->sample_id = NULL;
1054 zfree(&evsel->id);
1055}
1056
1057static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1058{
1059 struct perf_evsel_config_term *term, *h;
1060
1061 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1062 list_del(&term->list);
1063 free(term);
1064 }
1065}
1066
1067void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1068{
1069 int cpu, thread;
1070
1071 if (evsel->system_wide)
1072 nthreads = 1;
1073
1074 for (cpu = 0; cpu < ncpus; cpu++)
1075 for (thread = 0; thread < nthreads; ++thread) {
1076 close(FD(evsel, cpu, thread));
1077 FD(evsel, cpu, thread) = -1;
1078 }
1079}
1080
1081void perf_evsel__exit(struct perf_evsel *evsel)
1082{
1083 assert(list_empty(&evsel->node));
1084 assert(evsel->evlist == NULL);
1085 perf_evsel__free_fd(evsel);
1086 perf_evsel__free_id(evsel);
1087 perf_evsel__free_config_terms(evsel);
1088 close_cgroup(evsel->cgrp);
1089 cpu_map__put(evsel->cpus);
1090 cpu_map__put(evsel->own_cpus);
1091 thread_map__put(evsel->threads);
1092 zfree(&evsel->group_name);
1093 zfree(&evsel->name);
1094 perf_evsel__object.fini(evsel);
1095}
1096
1097void perf_evsel__delete(struct perf_evsel *evsel)
1098{
1099 perf_evsel__exit(evsel);
1100 free(evsel);
1101}
1102
1103void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1104 struct perf_counts_values *count)
1105{
1106 struct perf_counts_values tmp;
1107
1108 if (!evsel->prev_raw_counts)
1109 return;
1110
1111 if (cpu == -1) {
1112 tmp = evsel->prev_raw_counts->aggr;
1113 evsel->prev_raw_counts->aggr = *count;
1114 } else {
1115 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1116 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1117 }
1118
1119 count->val = count->val - tmp.val;
1120 count->ena = count->ena - tmp.ena;
1121 count->run = count->run - tmp.run;
1122}
1123
1124void perf_counts_values__scale(struct perf_counts_values *count,
1125 bool scale, s8 *pscaled)
1126{
1127 s8 scaled = 0;
1128
1129 if (scale) {
1130 if (count->run == 0) {
1131 scaled = -1;
1132 count->val = 0;
1133 } else if (count->run < count->ena) {
1134 scaled = 1;
1135 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1136 }
1137 } else
1138 count->ena = count->run = 0;
1139
1140 if (pscaled)
1141 *pscaled = scaled;
1142}
1143
1144int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1145 struct perf_counts_values *count)
1146{
1147 memset(count, 0, sizeof(*count));
1148
1149 if (FD(evsel, cpu, thread) < 0)
1150 return -EINVAL;
1151
1152 if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
1153 return -errno;
1154
1155 return 0;
1156}
1157
1158int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1159 int cpu, int thread, bool scale)
1160{
1161 struct perf_counts_values count;
1162 size_t nv = scale ? 3 : 1;
1163
1164 if (FD(evsel, cpu, thread) < 0)
1165 return -EINVAL;
1166
1167 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1168 return -ENOMEM;
1169
1170 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
1171 return -errno;
1172
1173 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1174 perf_counts_values__scale(&count, scale, NULL);
1175 *perf_counts(evsel->counts, cpu, thread) = count;
1176 return 0;
1177}
1178
1179static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1180{
1181 struct perf_evsel *leader = evsel->leader;
1182 int fd;
1183
1184 if (perf_evsel__is_group_leader(evsel))
1185 return -1;
1186
1187 /*
1188 * Leader must be already processed/open,
1189 * if not it's a bug.
1190 */
1191 BUG_ON(!leader->fd);
1192
1193 fd = FD(leader, cpu, thread);
1194 BUG_ON(fd == -1);
1195
1196 return fd;
1197}
1198
1199struct bit_names {
1200 int bit;
1201 const char *name;
1202};
1203
1204static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1205{
1206 bool first_bit = true;
1207 int i = 0;
1208
1209 do {
1210 if (value & bits[i].bit) {
1211 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1212 first_bit = false;
1213 }
1214 } while (bits[++i].name != NULL);
1215}
1216
1217static void __p_sample_type(char *buf, size_t size, u64 value)
1218{
1219#define bit_name(n) { PERF_SAMPLE_##n, #n }
1220 struct bit_names bits[] = {
1221 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1222 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1223 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1224 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1225 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1226 bit_name(WEIGHT),
1227 { .name = NULL, }
1228 };
1229#undef bit_name
1230 __p_bits(buf, size, value, bits);
1231}
1232
1233static void __p_read_format(char *buf, size_t size, u64 value)
1234{
1235#define bit_name(n) { PERF_FORMAT_##n, #n }
1236 struct bit_names bits[] = {
1237 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1238 bit_name(ID), bit_name(GROUP),
1239 { .name = NULL, }
1240 };
1241#undef bit_name
1242 __p_bits(buf, size, value, bits);
1243}
1244
1245#define BUF_SIZE 1024
1246
1247#define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1248#define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1249#define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1250#define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1251#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1252
1253#define PRINT_ATTRn(_n, _f, _p) \
1254do { \
1255 if (attr->_f) { \
1256 _p(attr->_f); \
1257 ret += attr__fprintf(fp, _n, buf, priv);\
1258 } \
1259} while (0)
1260
1261#define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1262
1263int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1264 attr__fprintf_f attr__fprintf, void *priv)
1265{
1266 char buf[BUF_SIZE];
1267 int ret = 0;
1268
1269 PRINT_ATTRf(type, p_unsigned);
1270 PRINT_ATTRf(size, p_unsigned);
1271 PRINT_ATTRf(config, p_hex);
1272 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1273 PRINT_ATTRf(sample_type, p_sample_type);
1274 PRINT_ATTRf(read_format, p_read_format);
1275
1276 PRINT_ATTRf(disabled, p_unsigned);
1277 PRINT_ATTRf(inherit, p_unsigned);
1278 PRINT_ATTRf(pinned, p_unsigned);
1279 PRINT_ATTRf(exclusive, p_unsigned);
1280 PRINT_ATTRf(exclude_user, p_unsigned);
1281 PRINT_ATTRf(exclude_kernel, p_unsigned);
1282 PRINT_ATTRf(exclude_hv, p_unsigned);
1283 PRINT_ATTRf(exclude_idle, p_unsigned);
1284 PRINT_ATTRf(mmap, p_unsigned);
1285 PRINT_ATTRf(comm, p_unsigned);
1286 PRINT_ATTRf(freq, p_unsigned);
1287 PRINT_ATTRf(inherit_stat, p_unsigned);
1288 PRINT_ATTRf(enable_on_exec, p_unsigned);
1289 PRINT_ATTRf(task, p_unsigned);
1290 PRINT_ATTRf(watermark, p_unsigned);
1291 PRINT_ATTRf(precise_ip, p_unsigned);
1292 PRINT_ATTRf(mmap_data, p_unsigned);
1293 PRINT_ATTRf(sample_id_all, p_unsigned);
1294 PRINT_ATTRf(exclude_host, p_unsigned);
1295 PRINT_ATTRf(exclude_guest, p_unsigned);
1296 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1297 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1298 PRINT_ATTRf(mmap2, p_unsigned);
1299 PRINT_ATTRf(comm_exec, p_unsigned);
1300 PRINT_ATTRf(use_clockid, p_unsigned);
1301 PRINT_ATTRf(context_switch, p_unsigned);
1302
1303 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1304 PRINT_ATTRf(bp_type, p_unsigned);
1305 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1306 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1307 PRINT_ATTRf(branch_sample_type, p_unsigned);
1308 PRINT_ATTRf(sample_regs_user, p_hex);
1309 PRINT_ATTRf(sample_stack_user, p_unsigned);
1310 PRINT_ATTRf(clockid, p_signed);
1311 PRINT_ATTRf(sample_regs_intr, p_hex);
1312 PRINT_ATTRf(aux_watermark, p_unsigned);
1313
1314 return ret;
1315}
1316
1317static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1318 void *priv __attribute__((unused)))
1319{
1320 return fprintf(fp, " %-32s %s\n", name, val);
1321}
1322
1323static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1324 struct thread_map *threads)
1325{
1326 int cpu, thread, nthreads;
1327 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1328 int pid = -1, err;
1329 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1330
1331 if (evsel->system_wide)
1332 nthreads = 1;
1333 else
1334 nthreads = threads->nr;
1335
1336 if (evsel->fd == NULL &&
1337 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1338 return -ENOMEM;
1339
1340 if (evsel->cgrp) {
1341 flags |= PERF_FLAG_PID_CGROUP;
1342 pid = evsel->cgrp->fd;
1343 }
1344
1345fallback_missing_features:
1346 if (perf_missing_features.clockid_wrong)
1347 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1348 if (perf_missing_features.clockid) {
1349 evsel->attr.use_clockid = 0;
1350 evsel->attr.clockid = 0;
1351 }
1352 if (perf_missing_features.cloexec)
1353 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1354 if (perf_missing_features.mmap2)
1355 evsel->attr.mmap2 = 0;
1356 if (perf_missing_features.exclude_guest)
1357 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1358 if (perf_missing_features.lbr_flags)
1359 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1360 PERF_SAMPLE_BRANCH_NO_CYCLES);
1361retry_sample_id:
1362 if (perf_missing_features.sample_id_all)
1363 evsel->attr.sample_id_all = 0;
1364
1365 if (verbose >= 2) {
1366 fprintf(stderr, "%.60s\n", graph_dotted_line);
1367 fprintf(stderr, "perf_event_attr:\n");
1368 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1369 fprintf(stderr, "%.60s\n", graph_dotted_line);
1370 }
1371
1372 for (cpu = 0; cpu < cpus->nr; cpu++) {
1373
1374 for (thread = 0; thread < nthreads; thread++) {
1375 int group_fd;
1376
1377 if (!evsel->cgrp && !evsel->system_wide)
1378 pid = thread_map__pid(threads, thread);
1379
1380 group_fd = get_group_fd(evsel, cpu, thread);
1381retry_open:
1382 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1383 pid, cpus->map[cpu], group_fd, flags);
1384
1385 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1386 pid,
1387 cpus->map[cpu],
1388 group_fd, flags);
1389 if (FD(evsel, cpu, thread) < 0) {
1390 err = -errno;
1391 pr_debug2("sys_perf_event_open failed, error %d\n",
1392 err);
1393 goto try_fallback;
1394 }
1395
1396 if (evsel->bpf_fd >= 0) {
1397 int evt_fd = FD(evsel, cpu, thread);
1398 int bpf_fd = evsel->bpf_fd;
1399
1400 err = ioctl(evt_fd,
1401 PERF_EVENT_IOC_SET_BPF,
1402 bpf_fd);
1403 if (err && errno != EEXIST) {
1404 pr_err("failed to attach bpf fd %d: %s\n",
1405 bpf_fd, strerror(errno));
1406 err = -EINVAL;
1407 goto out_close;
1408 }
1409 }
1410
1411 set_rlimit = NO_CHANGE;
1412
1413 /*
1414 * If we succeeded but had to kill clockid, fail and
1415 * have perf_evsel__open_strerror() print us a nice
1416 * error.
1417 */
1418 if (perf_missing_features.clockid ||
1419 perf_missing_features.clockid_wrong) {
1420 err = -EINVAL;
1421 goto out_close;
1422 }
1423 }
1424 }
1425
1426 return 0;
1427
1428try_fallback:
1429 /*
1430 * perf stat needs between 5 and 22 fds per CPU. When we run out
1431 * of them try to increase the limits.
1432 */
1433 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1434 struct rlimit l;
1435 int old_errno = errno;
1436
1437 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1438 if (set_rlimit == NO_CHANGE)
1439 l.rlim_cur = l.rlim_max;
1440 else {
1441 l.rlim_cur = l.rlim_max + 1000;
1442 l.rlim_max = l.rlim_cur;
1443 }
1444 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1445 set_rlimit++;
1446 errno = old_errno;
1447 goto retry_open;
1448 }
1449 }
1450 errno = old_errno;
1451 }
1452
1453 if (err != -EINVAL || cpu > 0 || thread > 0)
1454 goto out_close;
1455
1456 /*
1457 * Must probe features in the order they were added to the
1458 * perf_event_attr interface.
1459 */
1460 if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1461 perf_missing_features.clockid_wrong = true;
1462 goto fallback_missing_features;
1463 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1464 perf_missing_features.clockid = true;
1465 goto fallback_missing_features;
1466 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1467 perf_missing_features.cloexec = true;
1468 goto fallback_missing_features;
1469 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1470 perf_missing_features.mmap2 = true;
1471 goto fallback_missing_features;
1472 } else if (!perf_missing_features.exclude_guest &&
1473 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1474 perf_missing_features.exclude_guest = true;
1475 goto fallback_missing_features;
1476 } else if (!perf_missing_features.sample_id_all) {
1477 perf_missing_features.sample_id_all = true;
1478 goto retry_sample_id;
1479 } else if (!perf_missing_features.lbr_flags &&
1480 (evsel->attr.branch_sample_type &
1481 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1482 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1483 perf_missing_features.lbr_flags = true;
1484 goto fallback_missing_features;
1485 }
1486
1487out_close:
1488 do {
1489 while (--thread >= 0) {
1490 close(FD(evsel, cpu, thread));
1491 FD(evsel, cpu, thread) = -1;
1492 }
1493 thread = nthreads;
1494 } while (--cpu >= 0);
1495 return err;
1496}
1497
1498void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1499{
1500 if (evsel->fd == NULL)
1501 return;
1502
1503 perf_evsel__close_fd(evsel, ncpus, nthreads);
1504 perf_evsel__free_fd(evsel);
1505}
1506
1507static struct {
1508 struct cpu_map map;
1509 int cpus[1];
1510} empty_cpu_map = {
1511 .map.nr = 1,
1512 .cpus = { -1, },
1513};
1514
1515static struct {
1516 struct thread_map map;
1517 int threads[1];
1518} empty_thread_map = {
1519 .map.nr = 1,
1520 .threads = { -1, },
1521};
1522
1523int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1524 struct thread_map *threads)
1525{
1526 if (cpus == NULL) {
1527 /* Work around old compiler warnings about strict aliasing */
1528 cpus = &empty_cpu_map.map;
1529 }
1530
1531 if (threads == NULL)
1532 threads = &empty_thread_map.map;
1533
1534 return __perf_evsel__open(evsel, cpus, threads);
1535}
1536
1537int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1538 struct cpu_map *cpus)
1539{
1540 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1541}
1542
1543int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1544 struct thread_map *threads)
1545{
1546 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1547}
1548
1549static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1550 const union perf_event *event,
1551 struct perf_sample *sample)
1552{
1553 u64 type = evsel->attr.sample_type;
1554 const u64 *array = event->sample.array;
1555 bool swapped = evsel->needs_swap;
1556 union u64_swap u;
1557
1558 array += ((event->header.size -
1559 sizeof(event->header)) / sizeof(u64)) - 1;
1560
1561 if (type & PERF_SAMPLE_IDENTIFIER) {
1562 sample->id = *array;
1563 array--;
1564 }
1565
1566 if (type & PERF_SAMPLE_CPU) {
1567 u.val64 = *array;
1568 if (swapped) {
1569 /* undo swap of u64, then swap on individual u32s */
1570 u.val64 = bswap_64(u.val64);
1571 u.val32[0] = bswap_32(u.val32[0]);
1572 }
1573
1574 sample->cpu = u.val32[0];
1575 array--;
1576 }
1577
1578 if (type & PERF_SAMPLE_STREAM_ID) {
1579 sample->stream_id = *array;
1580 array--;
1581 }
1582
1583 if (type & PERF_SAMPLE_ID) {
1584 sample->id = *array;
1585 array--;
1586 }
1587
1588 if (type & PERF_SAMPLE_TIME) {
1589 sample->time = *array;
1590 array--;
1591 }
1592
1593 if (type & PERF_SAMPLE_TID) {
1594 u.val64 = *array;
1595 if (swapped) {
1596 /* undo swap of u64, then swap on individual u32s */
1597 u.val64 = bswap_64(u.val64);
1598 u.val32[0] = bswap_32(u.val32[0]);
1599 u.val32[1] = bswap_32(u.val32[1]);
1600 }
1601
1602 sample->pid = u.val32[0];
1603 sample->tid = u.val32[1];
1604 array--;
1605 }
1606
1607 return 0;
1608}
1609
1610static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1611 u64 size)
1612{
1613 return size > max_size || offset + size > endp;
1614}
1615
1616#define OVERFLOW_CHECK(offset, size, max_size) \
1617 do { \
1618 if (overflow(endp, (max_size), (offset), (size))) \
1619 return -EFAULT; \
1620 } while (0)
1621
1622#define OVERFLOW_CHECK_u64(offset) \
1623 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1624
1625int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1626 struct perf_sample *data)
1627{
1628 u64 type = evsel->attr.sample_type;
1629 bool swapped = evsel->needs_swap;
1630 const u64 *array;
1631 u16 max_size = event->header.size;
1632 const void *endp = (void *)event + max_size;
1633 u64 sz;
1634
1635 /*
1636 * used for cross-endian analysis. See git commit 65014ab3
1637 * for why this goofiness is needed.
1638 */
1639 union u64_swap u;
1640
1641 memset(data, 0, sizeof(*data));
1642 data->cpu = data->pid = data->tid = -1;
1643 data->stream_id = data->id = data->time = -1ULL;
1644 data->period = evsel->attr.sample_period;
1645 data->weight = 0;
1646 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1647
1648 if (event->header.type != PERF_RECORD_SAMPLE) {
1649 if (!evsel->attr.sample_id_all)
1650 return 0;
1651 return perf_evsel__parse_id_sample(evsel, event, data);
1652 }
1653
1654 array = event->sample.array;
1655
1656 /*
1657 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1658 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1659 * check the format does not go past the end of the event.
1660 */
1661 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1662 return -EFAULT;
1663
1664 data->id = -1ULL;
1665 if (type & PERF_SAMPLE_IDENTIFIER) {
1666 data->id = *array;
1667 array++;
1668 }
1669
1670 if (type & PERF_SAMPLE_IP) {
1671 data->ip = *array;
1672 array++;
1673 }
1674
1675 if (type & PERF_SAMPLE_TID) {
1676 u.val64 = *array;
1677 if (swapped) {
1678 /* undo swap of u64, then swap on individual u32s */
1679 u.val64 = bswap_64(u.val64);
1680 u.val32[0] = bswap_32(u.val32[0]);
1681 u.val32[1] = bswap_32(u.val32[1]);
1682 }
1683
1684 data->pid = u.val32[0];
1685 data->tid = u.val32[1];
1686 array++;
1687 }
1688
1689 if (type & PERF_SAMPLE_TIME) {
1690 data->time = *array;
1691 array++;
1692 }
1693
1694 data->addr = 0;
1695 if (type & PERF_SAMPLE_ADDR) {
1696 data->addr = *array;
1697 array++;
1698 }
1699
1700 if (type & PERF_SAMPLE_ID) {
1701 data->id = *array;
1702 array++;
1703 }
1704
1705 if (type & PERF_SAMPLE_STREAM_ID) {
1706 data->stream_id = *array;
1707 array++;
1708 }
1709
1710 if (type & PERF_SAMPLE_CPU) {
1711
1712 u.val64 = *array;
1713 if (swapped) {
1714 /* undo swap of u64, then swap on individual u32s */
1715 u.val64 = bswap_64(u.val64);
1716 u.val32[0] = bswap_32(u.val32[0]);
1717 }
1718
1719 data->cpu = u.val32[0];
1720 array++;
1721 }
1722
1723 if (type & PERF_SAMPLE_PERIOD) {
1724 data->period = *array;
1725 array++;
1726 }
1727
1728 if (type & PERF_SAMPLE_READ) {
1729 u64 read_format = evsel->attr.read_format;
1730
1731 OVERFLOW_CHECK_u64(array);
1732 if (read_format & PERF_FORMAT_GROUP)
1733 data->read.group.nr = *array;
1734 else
1735 data->read.one.value = *array;
1736
1737 array++;
1738
1739 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1740 OVERFLOW_CHECK_u64(array);
1741 data->read.time_enabled = *array;
1742 array++;
1743 }
1744
1745 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1746 OVERFLOW_CHECK_u64(array);
1747 data->read.time_running = *array;
1748 array++;
1749 }
1750
1751 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1752 if (read_format & PERF_FORMAT_GROUP) {
1753 const u64 max_group_nr = UINT64_MAX /
1754 sizeof(struct sample_read_value);
1755
1756 if (data->read.group.nr > max_group_nr)
1757 return -EFAULT;
1758 sz = data->read.group.nr *
1759 sizeof(struct sample_read_value);
1760 OVERFLOW_CHECK(array, sz, max_size);
1761 data->read.group.values =
1762 (struct sample_read_value *)array;
1763 array = (void *)array + sz;
1764 } else {
1765 OVERFLOW_CHECK_u64(array);
1766 data->read.one.id = *array;
1767 array++;
1768 }
1769 }
1770
1771 if (type & PERF_SAMPLE_CALLCHAIN) {
1772 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1773
1774 OVERFLOW_CHECK_u64(array);
1775 data->callchain = (struct ip_callchain *)array++;
1776 if (data->callchain->nr > max_callchain_nr)
1777 return -EFAULT;
1778 sz = data->callchain->nr * sizeof(u64);
1779 OVERFLOW_CHECK(array, sz, max_size);
1780 array = (void *)array + sz;
1781 }
1782
1783 if (type & PERF_SAMPLE_RAW) {
1784 OVERFLOW_CHECK_u64(array);
1785 u.val64 = *array;
1786 if (WARN_ONCE(swapped,
1787 "Endianness of raw data not corrected!\n")) {
1788 /* undo swap of u64, then swap on individual u32s */
1789 u.val64 = bswap_64(u.val64);
1790 u.val32[0] = bswap_32(u.val32[0]);
1791 u.val32[1] = bswap_32(u.val32[1]);
1792 }
1793 data->raw_size = u.val32[0];
1794 array = (void *)array + sizeof(u32);
1795
1796 OVERFLOW_CHECK(array, data->raw_size, max_size);
1797 data->raw_data = (void *)array;
1798 array = (void *)array + data->raw_size;
1799 }
1800
1801 if (type & PERF_SAMPLE_BRANCH_STACK) {
1802 const u64 max_branch_nr = UINT64_MAX /
1803 sizeof(struct branch_entry);
1804
1805 OVERFLOW_CHECK_u64(array);
1806 data->branch_stack = (struct branch_stack *)array++;
1807
1808 if (data->branch_stack->nr > max_branch_nr)
1809 return -EFAULT;
1810 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1811 OVERFLOW_CHECK(array, sz, max_size);
1812 array = (void *)array + sz;
1813 }
1814
1815 if (type & PERF_SAMPLE_REGS_USER) {
1816 OVERFLOW_CHECK_u64(array);
1817 data->user_regs.abi = *array;
1818 array++;
1819
1820 if (data->user_regs.abi) {
1821 u64 mask = evsel->attr.sample_regs_user;
1822
1823 sz = hweight_long(mask) * sizeof(u64);
1824 OVERFLOW_CHECK(array, sz, max_size);
1825 data->user_regs.mask = mask;
1826 data->user_regs.regs = (u64 *)array;
1827 array = (void *)array + sz;
1828 }
1829 }
1830
1831 if (type & PERF_SAMPLE_STACK_USER) {
1832 OVERFLOW_CHECK_u64(array);
1833 sz = *array++;
1834
1835 data->user_stack.offset = ((char *)(array - 1)
1836 - (char *) event);
1837
1838 if (!sz) {
1839 data->user_stack.size = 0;
1840 } else {
1841 OVERFLOW_CHECK(array, sz, max_size);
1842 data->user_stack.data = (char *)array;
1843 array = (void *)array + sz;
1844 OVERFLOW_CHECK_u64(array);
1845 data->user_stack.size = *array++;
1846 if (WARN_ONCE(data->user_stack.size > sz,
1847 "user stack dump failure\n"))
1848 return -EFAULT;
1849 }
1850 }
1851
1852 data->weight = 0;
1853 if (type & PERF_SAMPLE_WEIGHT) {
1854 OVERFLOW_CHECK_u64(array);
1855 data->weight = *array;
1856 array++;
1857 }
1858
1859 data->data_src = PERF_MEM_DATA_SRC_NONE;
1860 if (type & PERF_SAMPLE_DATA_SRC) {
1861 OVERFLOW_CHECK_u64(array);
1862 data->data_src = *array;
1863 array++;
1864 }
1865
1866 data->transaction = 0;
1867 if (type & PERF_SAMPLE_TRANSACTION) {
1868 OVERFLOW_CHECK_u64(array);
1869 data->transaction = *array;
1870 array++;
1871 }
1872
1873 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1874 if (type & PERF_SAMPLE_REGS_INTR) {
1875 OVERFLOW_CHECK_u64(array);
1876 data->intr_regs.abi = *array;
1877 array++;
1878
1879 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1880 u64 mask = evsel->attr.sample_regs_intr;
1881
1882 sz = hweight_long(mask) * sizeof(u64);
1883 OVERFLOW_CHECK(array, sz, max_size);
1884 data->intr_regs.mask = mask;
1885 data->intr_regs.regs = (u64 *)array;
1886 array = (void *)array + sz;
1887 }
1888 }
1889
1890 return 0;
1891}
1892
1893size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1894 u64 read_format)
1895{
1896 size_t sz, result = sizeof(struct sample_event);
1897
1898 if (type & PERF_SAMPLE_IDENTIFIER)
1899 result += sizeof(u64);
1900
1901 if (type & PERF_SAMPLE_IP)
1902 result += sizeof(u64);
1903
1904 if (type & PERF_SAMPLE_TID)
1905 result += sizeof(u64);
1906
1907 if (type & PERF_SAMPLE_TIME)
1908 result += sizeof(u64);
1909
1910 if (type & PERF_SAMPLE_ADDR)
1911 result += sizeof(u64);
1912
1913 if (type & PERF_SAMPLE_ID)
1914 result += sizeof(u64);
1915
1916 if (type & PERF_SAMPLE_STREAM_ID)
1917 result += sizeof(u64);
1918
1919 if (type & PERF_SAMPLE_CPU)
1920 result += sizeof(u64);
1921
1922 if (type & PERF_SAMPLE_PERIOD)
1923 result += sizeof(u64);
1924
1925 if (type & PERF_SAMPLE_READ) {
1926 result += sizeof(u64);
1927 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1928 result += sizeof(u64);
1929 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1930 result += sizeof(u64);
1931 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1932 if (read_format & PERF_FORMAT_GROUP) {
1933 sz = sample->read.group.nr *
1934 sizeof(struct sample_read_value);
1935 result += sz;
1936 } else {
1937 result += sizeof(u64);
1938 }
1939 }
1940
1941 if (type & PERF_SAMPLE_CALLCHAIN) {
1942 sz = (sample->callchain->nr + 1) * sizeof(u64);
1943 result += sz;
1944 }
1945
1946 if (type & PERF_SAMPLE_RAW) {
1947 result += sizeof(u32);
1948 result += sample->raw_size;
1949 }
1950
1951 if (type & PERF_SAMPLE_BRANCH_STACK) {
1952 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1953 sz += sizeof(u64);
1954 result += sz;
1955 }
1956
1957 if (type & PERF_SAMPLE_REGS_USER) {
1958 if (sample->user_regs.abi) {
1959 result += sizeof(u64);
1960 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
1961 result += sz;
1962 } else {
1963 result += sizeof(u64);
1964 }
1965 }
1966
1967 if (type & PERF_SAMPLE_STACK_USER) {
1968 sz = sample->user_stack.size;
1969 result += sizeof(u64);
1970 if (sz) {
1971 result += sz;
1972 result += sizeof(u64);
1973 }
1974 }
1975
1976 if (type & PERF_SAMPLE_WEIGHT)
1977 result += sizeof(u64);
1978
1979 if (type & PERF_SAMPLE_DATA_SRC)
1980 result += sizeof(u64);
1981
1982 if (type & PERF_SAMPLE_TRANSACTION)
1983 result += sizeof(u64);
1984
1985 if (type & PERF_SAMPLE_REGS_INTR) {
1986 if (sample->intr_regs.abi) {
1987 result += sizeof(u64);
1988 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1989 result += sz;
1990 } else {
1991 result += sizeof(u64);
1992 }
1993 }
1994
1995 return result;
1996}
1997
1998int perf_event__synthesize_sample(union perf_event *event, u64 type,
1999 u64 read_format,
2000 const struct perf_sample *sample,
2001 bool swapped)
2002{
2003 u64 *array;
2004 size_t sz;
2005 /*
2006 * used for cross-endian analysis. See git commit 65014ab3
2007 * for why this goofiness is needed.
2008 */
2009 union u64_swap u;
2010
2011 array = event->sample.array;
2012
2013 if (type & PERF_SAMPLE_IDENTIFIER) {
2014 *array = sample->id;
2015 array++;
2016 }
2017
2018 if (type & PERF_SAMPLE_IP) {
2019 *array = sample->ip;
2020 array++;
2021 }
2022
2023 if (type & PERF_SAMPLE_TID) {
2024 u.val32[0] = sample->pid;
2025 u.val32[1] = sample->tid;
2026 if (swapped) {
2027 /*
2028 * Inverse of what is done in perf_evsel__parse_sample
2029 */
2030 u.val32[0] = bswap_32(u.val32[0]);
2031 u.val32[1] = bswap_32(u.val32[1]);
2032 u.val64 = bswap_64(u.val64);
2033 }
2034
2035 *array = u.val64;
2036 array++;
2037 }
2038
2039 if (type & PERF_SAMPLE_TIME) {
2040 *array = sample->time;
2041 array++;
2042 }
2043
2044 if (type & PERF_SAMPLE_ADDR) {
2045 *array = sample->addr;
2046 array++;
2047 }
2048
2049 if (type & PERF_SAMPLE_ID) {
2050 *array = sample->id;
2051 array++;
2052 }
2053
2054 if (type & PERF_SAMPLE_STREAM_ID) {
2055 *array = sample->stream_id;
2056 array++;
2057 }
2058
2059 if (type & PERF_SAMPLE_CPU) {
2060 u.val32[0] = sample->cpu;
2061 if (swapped) {
2062 /*
2063 * Inverse of what is done in perf_evsel__parse_sample
2064 */
2065 u.val32[0] = bswap_32(u.val32[0]);
2066 u.val64 = bswap_64(u.val64);
2067 }
2068 *array = u.val64;
2069 array++;
2070 }
2071
2072 if (type & PERF_SAMPLE_PERIOD) {
2073 *array = sample->period;
2074 array++;
2075 }
2076
2077 if (type & PERF_SAMPLE_READ) {
2078 if (read_format & PERF_FORMAT_GROUP)
2079 *array = sample->read.group.nr;
2080 else
2081 *array = sample->read.one.value;
2082 array++;
2083
2084 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2085 *array = sample->read.time_enabled;
2086 array++;
2087 }
2088
2089 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2090 *array = sample->read.time_running;
2091 array++;
2092 }
2093
2094 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2095 if (read_format & PERF_FORMAT_GROUP) {
2096 sz = sample->read.group.nr *
2097 sizeof(struct sample_read_value);
2098 memcpy(array, sample->read.group.values, sz);
2099 array = (void *)array + sz;
2100 } else {
2101 *array = sample->read.one.id;
2102 array++;
2103 }
2104 }
2105
2106 if (type & PERF_SAMPLE_CALLCHAIN) {
2107 sz = (sample->callchain->nr + 1) * sizeof(u64);
2108 memcpy(array, sample->callchain, sz);
2109 array = (void *)array + sz;
2110 }
2111
2112 if (type & PERF_SAMPLE_RAW) {
2113 u.val32[0] = sample->raw_size;
2114 if (WARN_ONCE(swapped,
2115 "Endianness of raw data not corrected!\n")) {
2116 /*
2117 * Inverse of what is done in perf_evsel__parse_sample
2118 */
2119 u.val32[0] = bswap_32(u.val32[0]);
2120 u.val32[1] = bswap_32(u.val32[1]);
2121 u.val64 = bswap_64(u.val64);
2122 }
2123 *array = u.val64;
2124 array = (void *)array + sizeof(u32);
2125
2126 memcpy(array, sample->raw_data, sample->raw_size);
2127 array = (void *)array + sample->raw_size;
2128 }
2129
2130 if (type & PERF_SAMPLE_BRANCH_STACK) {
2131 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2132 sz += sizeof(u64);
2133 memcpy(array, sample->branch_stack, sz);
2134 array = (void *)array + sz;
2135 }
2136
2137 if (type & PERF_SAMPLE_REGS_USER) {
2138 if (sample->user_regs.abi) {
2139 *array++ = sample->user_regs.abi;
2140 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2141 memcpy(array, sample->user_regs.regs, sz);
2142 array = (void *)array + sz;
2143 } else {
2144 *array++ = 0;
2145 }
2146 }
2147
2148 if (type & PERF_SAMPLE_STACK_USER) {
2149 sz = sample->user_stack.size;
2150 *array++ = sz;
2151 if (sz) {
2152 memcpy(array, sample->user_stack.data, sz);
2153 array = (void *)array + sz;
2154 *array++ = sz;
2155 }
2156 }
2157
2158 if (type & PERF_SAMPLE_WEIGHT) {
2159 *array = sample->weight;
2160 array++;
2161 }
2162
2163 if (type & PERF_SAMPLE_DATA_SRC) {
2164 *array = sample->data_src;
2165 array++;
2166 }
2167
2168 if (type & PERF_SAMPLE_TRANSACTION) {
2169 *array = sample->transaction;
2170 array++;
2171 }
2172
2173 if (type & PERF_SAMPLE_REGS_INTR) {
2174 if (sample->intr_regs.abi) {
2175 *array++ = sample->intr_regs.abi;
2176 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2177 memcpy(array, sample->intr_regs.regs, sz);
2178 array = (void *)array + sz;
2179 } else {
2180 *array++ = 0;
2181 }
2182 }
2183
2184 return 0;
2185}
2186
2187struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2188{
2189 return pevent_find_field(evsel->tp_format, name);
2190}
2191
2192void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2193 const char *name)
2194{
2195 struct format_field *field = perf_evsel__field(evsel, name);
2196 int offset;
2197
2198 if (!field)
2199 return NULL;
2200
2201 offset = field->offset;
2202
2203 if (field->flags & FIELD_IS_DYNAMIC) {
2204 offset = *(int *)(sample->raw_data + field->offset);
2205 offset &= 0xffff;
2206 }
2207
2208 return sample->raw_data + offset;
2209}
2210
2211u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2212 const char *name)
2213{
2214 struct format_field *field = perf_evsel__field(evsel, name);
2215 void *ptr;
2216 u64 value;
2217
2218 if (!field)
2219 return 0;
2220
2221 ptr = sample->raw_data + field->offset;
2222
2223 switch (field->size) {
2224 case 1:
2225 return *(u8 *)ptr;
2226 case 2:
2227 value = *(u16 *)ptr;
2228 break;
2229 case 4:
2230 value = *(u32 *)ptr;
2231 break;
2232 case 8:
2233 memcpy(&value, ptr, sizeof(u64));
2234 break;
2235 default:
2236 return 0;
2237 }
2238
2239 if (!evsel->needs_swap)
2240 return value;
2241
2242 switch (field->size) {
2243 case 2:
2244 return bswap_16(value);
2245 case 4:
2246 return bswap_32(value);
2247 case 8:
2248 return bswap_64(value);
2249 default:
2250 return 0;
2251 }
2252
2253 return 0;
2254}
2255
2256static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
2257{
2258 va_list args;
2259 int ret = 0;
2260
2261 if (!*first) {
2262 ret += fprintf(fp, ",");
2263 } else {
2264 ret += fprintf(fp, ":");
2265 *first = false;
2266 }
2267
2268 va_start(args, fmt);
2269 ret += vfprintf(fp, fmt, args);
2270 va_end(args);
2271 return ret;
2272}
2273
2274static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv)
2275{
2276 return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val);
2277}
2278
2279int perf_evsel__fprintf(struct perf_evsel *evsel,
2280 struct perf_attr_details *details, FILE *fp)
2281{
2282 bool first = true;
2283 int printed = 0;
2284
2285 if (details->event_group) {
2286 struct perf_evsel *pos;
2287
2288 if (!perf_evsel__is_group_leader(evsel))
2289 return 0;
2290
2291 if (evsel->nr_members > 1)
2292 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2293
2294 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2295 for_each_group_member(pos, evsel)
2296 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2297
2298 if (evsel->nr_members > 1)
2299 printed += fprintf(fp, "}");
2300 goto out;
2301 }
2302
2303 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2304
2305 if (details->verbose) {
2306 printed += perf_event_attr__fprintf(fp, &evsel->attr,
2307 __print_attr__fprintf, &first);
2308 } else if (details->freq) {
2309 const char *term = "sample_freq";
2310
2311 if (!evsel->attr.freq)
2312 term = "sample_period";
2313
2314 printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
2315 term, (u64)evsel->attr.sample_freq);
2316 }
2317
2318 if (details->trace_fields) {
2319 struct format_field *field;
2320
2321 if (evsel->attr.type != PERF_TYPE_TRACEPOINT) {
2322 printed += comma_fprintf(fp, &first, " (not a tracepoint)");
2323 goto out;
2324 }
2325
2326 field = evsel->tp_format->format.fields;
2327 if (field == NULL) {
2328 printed += comma_fprintf(fp, &first, " (no trace field)");
2329 goto out;
2330 }
2331
2332 printed += comma_fprintf(fp, &first, " trace_fields: %s", field->name);
2333
2334 field = field->next;
2335 while (field) {
2336 printed += comma_fprintf(fp, &first, "%s", field->name);
2337 field = field->next;
2338 }
2339 }
2340out:
2341 fputc('\n', fp);
2342 return ++printed;
2343}
2344
2345bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2346 char *msg, size_t msgsize)
2347{
2348 int paranoid;
2349
2350 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2351 evsel->attr.type == PERF_TYPE_HARDWARE &&
2352 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2353 /*
2354 * If it's cycles then fall back to hrtimer based
2355 * cpu-clock-tick sw counter, which is always available even if
2356 * no PMU support.
2357 *
2358 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2359 * b0a873e).
2360 */
2361 scnprintf(msg, msgsize, "%s",
2362"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2363
2364 evsel->attr.type = PERF_TYPE_SOFTWARE;
2365 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2366
2367 zfree(&evsel->name);
2368 return true;
2369 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2370 (paranoid = perf_event_paranoid()) > 1) {
2371 const char *name = perf_evsel__name(evsel);
2372 char *new_name;
2373
2374 if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
2375 return false;
2376
2377 if (evsel->name)
2378 free(evsel->name);
2379 evsel->name = new_name;
2380 scnprintf(msg, msgsize,
2381"kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2382 evsel->attr.exclude_kernel = 1;
2383
2384 return true;
2385 }
2386
2387 return false;
2388}
2389
2390int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2391 int err, char *msg, size_t size)
2392{
2393 char sbuf[STRERR_BUFSIZE];
2394
2395 switch (err) {
2396 case EPERM:
2397 case EACCES:
2398 return scnprintf(msg, size,
2399 "You may not have permission to collect %sstats.\n\n"
2400 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2401 "which controls use of the performance events system by\n"
2402 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2403 "The current value is %d:\n\n"
2404 " -1: Allow use of (almost) all events by all users\n"
2405 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
2406 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2407 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
2408 target->system_wide ? "system-wide " : "",
2409 perf_event_paranoid());
2410 case ENOENT:
2411 return scnprintf(msg, size, "The %s event is not supported.",
2412 perf_evsel__name(evsel));
2413 case EMFILE:
2414 return scnprintf(msg, size, "%s",
2415 "Too many events are opened.\n"
2416 "Probably the maximum number of open file descriptors has been reached.\n"
2417 "Hint: Try again after reducing the number of events.\n"
2418 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2419 case ENODEV:
2420 if (target->cpu_list)
2421 return scnprintf(msg, size, "%s",
2422 "No such device - did you specify an out-of-range profile CPU?\n");
2423 break;
2424 case EOPNOTSUPP:
2425 if (evsel->attr.precise_ip)
2426 return scnprintf(msg, size, "%s",
2427 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2428#if defined(__i386__) || defined(__x86_64__)
2429 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2430 return scnprintf(msg, size, "%s",
2431 "No hardware sampling interrupt available.\n"
2432 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2433#endif
2434 break;
2435 case EBUSY:
2436 if (find_process("oprofiled"))
2437 return scnprintf(msg, size,
2438 "The PMU counters are busy/taken by another profiler.\n"
2439 "We found oprofile daemon running, please stop it and try again.");
2440 break;
2441 case EINVAL:
2442 if (perf_missing_features.clockid)
2443 return scnprintf(msg, size, "clockid feature not supported.");
2444 if (perf_missing_features.clockid_wrong)
2445 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2446 break;
2447 default:
2448 break;
2449 }
2450
2451 return scnprintf(msg, size,
2452 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2453 "/bin/dmesg may provide additional information.\n"
2454 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
2455 err, strerror_r(err, sbuf, sizeof(sbuf)),
2456 perf_evsel__name(evsel));
2457}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 *
5 * Parts came from builtin-{top,stat,record}.c, see those files for further
6 * copyright notes.
7 */
8
9#include <byteswap.h>
10#include <errno.h>
11#include <inttypes.h>
12#include <linux/bitops.h>
13#include <api/fs/fs.h>
14#include <api/fs/tracing_path.h>
15#include <traceevent/event-parse.h>
16#include <linux/hw_breakpoint.h>
17#include <linux/perf_event.h>
18#include <linux/compiler.h>
19#include <linux/err.h>
20#include <linux/zalloc.h>
21#include <sys/ioctl.h>
22#include <sys/resource.h>
23#include <sys/types.h>
24#include <dirent.h>
25#include <stdlib.h>
26#include <perf/evsel.h>
27#include "asm/bug.h"
28#include "callchain.h"
29#include "cgroup.h"
30#include "counts.h"
31#include "event.h"
32#include "evsel.h"
33#include "util/env.h"
34#include "util/evsel_config.h"
35#include "util/evsel_fprintf.h"
36#include "evlist.h"
37#include <perf/cpumap.h>
38#include "thread_map.h"
39#include "target.h"
40#include "perf_regs.h"
41#include "record.h"
42#include "debug.h"
43#include "trace-event.h"
44#include "stat.h"
45#include "string2.h"
46#include "memswap.h"
47#include "util.h"
48#include "../perf-sys.h"
49#include "util/parse-branch-options.h"
50#include <internal/xyarray.h>
51#include <internal/lib.h>
52
53#include <linux/ctype.h>
54
55struct perf_missing_features perf_missing_features;
56
57static clockid_t clockid;
58
59static int perf_evsel__no_extra_init(struct evsel *evsel __maybe_unused)
60{
61 return 0;
62}
63
64void __weak test_attr__ready(void) { }
65
66static void perf_evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
67{
68}
69
70static struct {
71 size_t size;
72 int (*init)(struct evsel *evsel);
73 void (*fini)(struct evsel *evsel);
74} perf_evsel__object = {
75 .size = sizeof(struct evsel),
76 .init = perf_evsel__no_extra_init,
77 .fini = perf_evsel__no_extra_fini,
78};
79
80int perf_evsel__object_config(size_t object_size,
81 int (*init)(struct evsel *evsel),
82 void (*fini)(struct evsel *evsel))
83{
84
85 if (object_size == 0)
86 goto set_methods;
87
88 if (perf_evsel__object.size > object_size)
89 return -EINVAL;
90
91 perf_evsel__object.size = object_size;
92
93set_methods:
94 if (init != NULL)
95 perf_evsel__object.init = init;
96
97 if (fini != NULL)
98 perf_evsel__object.fini = fini;
99
100 return 0;
101}
102
103#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
104
105int __perf_evsel__sample_size(u64 sample_type)
106{
107 u64 mask = sample_type & PERF_SAMPLE_MASK;
108 int size = 0;
109 int i;
110
111 for (i = 0; i < 64; i++) {
112 if (mask & (1ULL << i))
113 size++;
114 }
115
116 size *= sizeof(u64);
117
118 return size;
119}
120
121/**
122 * __perf_evsel__calc_id_pos - calculate id_pos.
123 * @sample_type: sample type
124 *
125 * This function returns the position of the event id (PERF_SAMPLE_ID or
126 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
127 * perf_record_sample.
128 */
129static int __perf_evsel__calc_id_pos(u64 sample_type)
130{
131 int idx = 0;
132
133 if (sample_type & PERF_SAMPLE_IDENTIFIER)
134 return 0;
135
136 if (!(sample_type & PERF_SAMPLE_ID))
137 return -1;
138
139 if (sample_type & PERF_SAMPLE_IP)
140 idx += 1;
141
142 if (sample_type & PERF_SAMPLE_TID)
143 idx += 1;
144
145 if (sample_type & PERF_SAMPLE_TIME)
146 idx += 1;
147
148 if (sample_type & PERF_SAMPLE_ADDR)
149 idx += 1;
150
151 return idx;
152}
153
154/**
155 * __perf_evsel__calc_is_pos - calculate is_pos.
156 * @sample_type: sample type
157 *
158 * This function returns the position (counting backwards) of the event id
159 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
160 * sample_id_all is used there is an id sample appended to non-sample events.
161 */
162static int __perf_evsel__calc_is_pos(u64 sample_type)
163{
164 int idx = 1;
165
166 if (sample_type & PERF_SAMPLE_IDENTIFIER)
167 return 1;
168
169 if (!(sample_type & PERF_SAMPLE_ID))
170 return -1;
171
172 if (sample_type & PERF_SAMPLE_CPU)
173 idx += 1;
174
175 if (sample_type & PERF_SAMPLE_STREAM_ID)
176 idx += 1;
177
178 return idx;
179}
180
181void perf_evsel__calc_id_pos(struct evsel *evsel)
182{
183 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
184 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
185}
186
187void __perf_evsel__set_sample_bit(struct evsel *evsel,
188 enum perf_event_sample_format bit)
189{
190 if (!(evsel->core.attr.sample_type & bit)) {
191 evsel->core.attr.sample_type |= bit;
192 evsel->sample_size += sizeof(u64);
193 perf_evsel__calc_id_pos(evsel);
194 }
195}
196
197void __perf_evsel__reset_sample_bit(struct evsel *evsel,
198 enum perf_event_sample_format bit)
199{
200 if (evsel->core.attr.sample_type & bit) {
201 evsel->core.attr.sample_type &= ~bit;
202 evsel->sample_size -= sizeof(u64);
203 perf_evsel__calc_id_pos(evsel);
204 }
205}
206
207void perf_evsel__set_sample_id(struct evsel *evsel,
208 bool can_sample_identifier)
209{
210 if (can_sample_identifier) {
211 perf_evsel__reset_sample_bit(evsel, ID);
212 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
213 } else {
214 perf_evsel__set_sample_bit(evsel, ID);
215 }
216 evsel->core.attr.read_format |= PERF_FORMAT_ID;
217}
218
219/**
220 * perf_evsel__is_function_event - Return whether given evsel is a function
221 * trace event
222 *
223 * @evsel - evsel selector to be tested
224 *
225 * Return %true if event is function trace event
226 */
227bool perf_evsel__is_function_event(struct evsel *evsel)
228{
229#define FUNCTION_EVENT "ftrace:function"
230
231 return evsel->name &&
232 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
233
234#undef FUNCTION_EVENT
235}
236
237void evsel__init(struct evsel *evsel,
238 struct perf_event_attr *attr, int idx)
239{
240 perf_evsel__init(&evsel->core, attr);
241 evsel->idx = idx;
242 evsel->tracking = !idx;
243 evsel->leader = evsel;
244 evsel->unit = "";
245 evsel->scale = 1.0;
246 evsel->max_events = ULONG_MAX;
247 evsel->evlist = NULL;
248 evsel->bpf_obj = NULL;
249 evsel->bpf_fd = -1;
250 INIT_LIST_HEAD(&evsel->config_terms);
251 perf_evsel__object.init(evsel);
252 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
253 perf_evsel__calc_id_pos(evsel);
254 evsel->cmdline_group_boundary = false;
255 evsel->metric_expr = NULL;
256 evsel->metric_name = NULL;
257 evsel->metric_events = NULL;
258 evsel->collect_stat = false;
259 evsel->pmu_name = NULL;
260}
261
262struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
263{
264 struct evsel *evsel = zalloc(perf_evsel__object.size);
265
266 if (!evsel)
267 return NULL;
268 evsel__init(evsel, attr, idx);
269
270 if (perf_evsel__is_bpf_output(evsel)) {
271 evsel->core.attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
272 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
273 evsel->core.attr.sample_period = 1;
274 }
275
276 if (perf_evsel__is_clock(evsel)) {
277 /*
278 * The evsel->unit points to static alias->unit
279 * so it's ok to use static string in here.
280 */
281 static const char *unit = "msec";
282
283 evsel->unit = unit;
284 evsel->scale = 1e-6;
285 }
286
287 return evsel;
288}
289
290static bool perf_event_can_profile_kernel(void)
291{
292 return perf_event_paranoid_check(1);
293}
294
295struct evsel *perf_evsel__new_cycles(bool precise)
296{
297 struct perf_event_attr attr = {
298 .type = PERF_TYPE_HARDWARE,
299 .config = PERF_COUNT_HW_CPU_CYCLES,
300 .exclude_kernel = !perf_event_can_profile_kernel(),
301 };
302 struct evsel *evsel;
303
304 event_attr_init(&attr);
305
306 if (!precise)
307 goto new_event;
308
309 /*
310 * Now let the usual logic to set up the perf_event_attr defaults
311 * to kick in when we return and before perf_evsel__open() is called.
312 */
313new_event:
314 evsel = evsel__new(&attr);
315 if (evsel == NULL)
316 goto out;
317
318 evsel->precise_max = true;
319
320 /* use asprintf() because free(evsel) assumes name is allocated */
321 if (asprintf(&evsel->name, "cycles%s%s%.*s",
322 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
323 attr.exclude_kernel ? "u" : "",
324 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
325 goto error_free;
326out:
327 return evsel;
328error_free:
329 evsel__delete(evsel);
330 evsel = NULL;
331 goto out;
332}
333
334/*
335 * Returns pointer with encoded error via <linux/err.h> interface.
336 */
337struct evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
338{
339 struct evsel *evsel = zalloc(perf_evsel__object.size);
340 int err = -ENOMEM;
341
342 if (evsel == NULL) {
343 goto out_err;
344 } else {
345 struct perf_event_attr attr = {
346 .type = PERF_TYPE_TRACEPOINT,
347 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
348 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
349 };
350
351 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
352 goto out_free;
353
354 evsel->tp_format = trace_event__tp_format(sys, name);
355 if (IS_ERR(evsel->tp_format)) {
356 err = PTR_ERR(evsel->tp_format);
357 goto out_free;
358 }
359
360 event_attr_init(&attr);
361 attr.config = evsel->tp_format->id;
362 attr.sample_period = 1;
363 evsel__init(evsel, &attr, idx);
364 }
365
366 return evsel;
367
368out_free:
369 zfree(&evsel->name);
370 free(evsel);
371out_err:
372 return ERR_PTR(err);
373}
374
375const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
376 "cycles",
377 "instructions",
378 "cache-references",
379 "cache-misses",
380 "branches",
381 "branch-misses",
382 "bus-cycles",
383 "stalled-cycles-frontend",
384 "stalled-cycles-backend",
385 "ref-cycles",
386};
387
388static const char *__perf_evsel__hw_name(u64 config)
389{
390 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
391 return perf_evsel__hw_names[config];
392
393 return "unknown-hardware";
394}
395
396static int perf_evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
397{
398 int colon = 0, r = 0;
399 struct perf_event_attr *attr = &evsel->core.attr;
400 bool exclude_guest_default = false;
401
402#define MOD_PRINT(context, mod) do { \
403 if (!attr->exclude_##context) { \
404 if (!colon) colon = ++r; \
405 r += scnprintf(bf + r, size - r, "%c", mod); \
406 } } while(0)
407
408 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
409 MOD_PRINT(kernel, 'k');
410 MOD_PRINT(user, 'u');
411 MOD_PRINT(hv, 'h');
412 exclude_guest_default = true;
413 }
414
415 if (attr->precise_ip) {
416 if (!colon)
417 colon = ++r;
418 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
419 exclude_guest_default = true;
420 }
421
422 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
423 MOD_PRINT(host, 'H');
424 MOD_PRINT(guest, 'G');
425 }
426#undef MOD_PRINT
427 if (colon)
428 bf[colon - 1] = ':';
429 return r;
430}
431
432static int perf_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
433{
434 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->core.attr.config));
435 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
436}
437
438const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
439 "cpu-clock",
440 "task-clock",
441 "page-faults",
442 "context-switches",
443 "cpu-migrations",
444 "minor-faults",
445 "major-faults",
446 "alignment-faults",
447 "emulation-faults",
448 "dummy",
449};
450
451static const char *__perf_evsel__sw_name(u64 config)
452{
453 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
454 return perf_evsel__sw_names[config];
455 return "unknown-software";
456}
457
458static int perf_evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
459{
460 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->core.attr.config));
461 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
462}
463
464static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
465{
466 int r;
467
468 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
469
470 if (type & HW_BREAKPOINT_R)
471 r += scnprintf(bf + r, size - r, "r");
472
473 if (type & HW_BREAKPOINT_W)
474 r += scnprintf(bf + r, size - r, "w");
475
476 if (type & HW_BREAKPOINT_X)
477 r += scnprintf(bf + r, size - r, "x");
478
479 return r;
480}
481
482static int perf_evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
483{
484 struct perf_event_attr *attr = &evsel->core.attr;
485 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
486 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
487}
488
489const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
490 [PERF_EVSEL__MAX_ALIASES] = {
491 { "L1-dcache", "l1-d", "l1d", "L1-data", },
492 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
493 { "LLC", "L2", },
494 { "dTLB", "d-tlb", "Data-TLB", },
495 { "iTLB", "i-tlb", "Instruction-TLB", },
496 { "branch", "branches", "bpu", "btb", "bpc", },
497 { "node", },
498};
499
500const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
501 [PERF_EVSEL__MAX_ALIASES] = {
502 { "load", "loads", "read", },
503 { "store", "stores", "write", },
504 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
505};
506
507const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
508 [PERF_EVSEL__MAX_ALIASES] = {
509 { "refs", "Reference", "ops", "access", },
510 { "misses", "miss", },
511};
512
513#define C(x) PERF_COUNT_HW_CACHE_##x
514#define CACHE_READ (1 << C(OP_READ))
515#define CACHE_WRITE (1 << C(OP_WRITE))
516#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
517#define COP(x) (1 << x)
518
519/*
520 * cache operartion stat
521 * L1I : Read and prefetch only
522 * ITLB and BPU : Read-only
523 */
524static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
525 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
526 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
527 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
528 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
529 [C(ITLB)] = (CACHE_READ),
530 [C(BPU)] = (CACHE_READ),
531 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
532};
533
534bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
535{
536 if (perf_evsel__hw_cache_stat[type] & COP(op))
537 return true; /* valid */
538 else
539 return false; /* invalid */
540}
541
542int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
543 char *bf, size_t size)
544{
545 if (result) {
546 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
547 perf_evsel__hw_cache_op[op][0],
548 perf_evsel__hw_cache_result[result][0]);
549 }
550
551 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
552 perf_evsel__hw_cache_op[op][1]);
553}
554
555static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
556{
557 u8 op, result, type = (config >> 0) & 0xff;
558 const char *err = "unknown-ext-hardware-cache-type";
559
560 if (type >= PERF_COUNT_HW_CACHE_MAX)
561 goto out_err;
562
563 op = (config >> 8) & 0xff;
564 err = "unknown-ext-hardware-cache-op";
565 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
566 goto out_err;
567
568 result = (config >> 16) & 0xff;
569 err = "unknown-ext-hardware-cache-result";
570 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
571 goto out_err;
572
573 err = "invalid-cache";
574 if (!perf_evsel__is_cache_op_valid(type, op))
575 goto out_err;
576
577 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
578out_err:
579 return scnprintf(bf, size, "%s", err);
580}
581
582static int perf_evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
583{
584 int ret = __perf_evsel__hw_cache_name(evsel->core.attr.config, bf, size);
585 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
586}
587
588static int perf_evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
589{
590 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
591 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
592}
593
594static int perf_evsel__tool_name(char *bf, size_t size)
595{
596 int ret = scnprintf(bf, size, "duration_time");
597 return ret;
598}
599
600const char *perf_evsel__name(struct evsel *evsel)
601{
602 char bf[128];
603
604 if (!evsel)
605 goto out_unknown;
606
607 if (evsel->name)
608 return evsel->name;
609
610 switch (evsel->core.attr.type) {
611 case PERF_TYPE_RAW:
612 perf_evsel__raw_name(evsel, bf, sizeof(bf));
613 break;
614
615 case PERF_TYPE_HARDWARE:
616 perf_evsel__hw_name(evsel, bf, sizeof(bf));
617 break;
618
619 case PERF_TYPE_HW_CACHE:
620 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
621 break;
622
623 case PERF_TYPE_SOFTWARE:
624 if (evsel->tool_event)
625 perf_evsel__tool_name(bf, sizeof(bf));
626 else
627 perf_evsel__sw_name(evsel, bf, sizeof(bf));
628 break;
629
630 case PERF_TYPE_TRACEPOINT:
631 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
632 break;
633
634 case PERF_TYPE_BREAKPOINT:
635 perf_evsel__bp_name(evsel, bf, sizeof(bf));
636 break;
637
638 default:
639 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
640 evsel->core.attr.type);
641 break;
642 }
643
644 evsel->name = strdup(bf);
645
646 if (evsel->name)
647 return evsel->name;
648out_unknown:
649 return "unknown";
650}
651
652const char *perf_evsel__group_name(struct evsel *evsel)
653{
654 return evsel->group_name ?: "anon group";
655}
656
657/*
658 * Returns the group details for the specified leader,
659 * with following rules.
660 *
661 * For record -e '{cycles,instructions}'
662 * 'anon group { cycles:u, instructions:u }'
663 *
664 * For record -e 'cycles,instructions' and report --group
665 * 'cycles:u, instructions:u'
666 */
667int perf_evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
668{
669 int ret = 0;
670 struct evsel *pos;
671 const char *group_name = perf_evsel__group_name(evsel);
672
673 if (!evsel->forced_leader)
674 ret = scnprintf(buf, size, "%s { ", group_name);
675
676 ret += scnprintf(buf + ret, size - ret, "%s",
677 perf_evsel__name(evsel));
678
679 for_each_group_member(pos, evsel)
680 ret += scnprintf(buf + ret, size - ret, ", %s",
681 perf_evsel__name(pos));
682
683 if (!evsel->forced_leader)
684 ret += scnprintf(buf + ret, size - ret, " }");
685
686 return ret;
687}
688
689static void __perf_evsel__config_callchain(struct evsel *evsel,
690 struct record_opts *opts,
691 struct callchain_param *param)
692{
693 bool function = perf_evsel__is_function_event(evsel);
694 struct perf_event_attr *attr = &evsel->core.attr;
695
696 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
697
698 attr->sample_max_stack = param->max_stack;
699
700 if (opts->kernel_callchains)
701 attr->exclude_callchain_user = 1;
702 if (opts->user_callchains)
703 attr->exclude_callchain_kernel = 1;
704 if (param->record_mode == CALLCHAIN_LBR) {
705 if (!opts->branch_stack) {
706 if (attr->exclude_user) {
707 pr_warning("LBR callstack option is only available "
708 "to get user callchain information. "
709 "Falling back to framepointers.\n");
710 } else {
711 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
712 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
713 PERF_SAMPLE_BRANCH_CALL_STACK |
714 PERF_SAMPLE_BRANCH_NO_CYCLES |
715 PERF_SAMPLE_BRANCH_NO_FLAGS;
716 }
717 } else
718 pr_warning("Cannot use LBR callstack with branch stack. "
719 "Falling back to framepointers.\n");
720 }
721
722 if (param->record_mode == CALLCHAIN_DWARF) {
723 if (!function) {
724 perf_evsel__set_sample_bit(evsel, REGS_USER);
725 perf_evsel__set_sample_bit(evsel, STACK_USER);
726 if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
727 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
728 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
729 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
730 "so the minimal registers set (IP, SP) is explicitly forced.\n");
731 } else {
732 attr->sample_regs_user |= PERF_REGS_MASK;
733 }
734 attr->sample_stack_user = param->dump_size;
735 attr->exclude_callchain_user = 1;
736 } else {
737 pr_info("Cannot use DWARF unwind for function trace event,"
738 " falling back to framepointers.\n");
739 }
740 }
741
742 if (function) {
743 pr_info("Disabling user space callchains for function trace event.\n");
744 attr->exclude_callchain_user = 1;
745 }
746}
747
748void perf_evsel__config_callchain(struct evsel *evsel,
749 struct record_opts *opts,
750 struct callchain_param *param)
751{
752 if (param->enabled)
753 return __perf_evsel__config_callchain(evsel, opts, param);
754}
755
756static void
757perf_evsel__reset_callgraph(struct evsel *evsel,
758 struct callchain_param *param)
759{
760 struct perf_event_attr *attr = &evsel->core.attr;
761
762 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
763 if (param->record_mode == CALLCHAIN_LBR) {
764 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
765 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
766 PERF_SAMPLE_BRANCH_CALL_STACK);
767 }
768 if (param->record_mode == CALLCHAIN_DWARF) {
769 perf_evsel__reset_sample_bit(evsel, REGS_USER);
770 perf_evsel__reset_sample_bit(evsel, STACK_USER);
771 }
772}
773
774static void apply_config_terms(struct evsel *evsel,
775 struct record_opts *opts, bool track)
776{
777 struct perf_evsel_config_term *term;
778 struct list_head *config_terms = &evsel->config_terms;
779 struct perf_event_attr *attr = &evsel->core.attr;
780 /* callgraph default */
781 struct callchain_param param = {
782 .record_mode = callchain_param.record_mode,
783 };
784 u32 dump_size = 0;
785 int max_stack = 0;
786 const char *callgraph_buf = NULL;
787
788 list_for_each_entry(term, config_terms, list) {
789 switch (term->type) {
790 case PERF_EVSEL__CONFIG_TERM_PERIOD:
791 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
792 attr->sample_period = term->val.period;
793 attr->freq = 0;
794 perf_evsel__reset_sample_bit(evsel, PERIOD);
795 }
796 break;
797 case PERF_EVSEL__CONFIG_TERM_FREQ:
798 if (!(term->weak && opts->user_freq != UINT_MAX)) {
799 attr->sample_freq = term->val.freq;
800 attr->freq = 1;
801 perf_evsel__set_sample_bit(evsel, PERIOD);
802 }
803 break;
804 case PERF_EVSEL__CONFIG_TERM_TIME:
805 if (term->val.time)
806 perf_evsel__set_sample_bit(evsel, TIME);
807 else
808 perf_evsel__reset_sample_bit(evsel, TIME);
809 break;
810 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
811 callgraph_buf = term->val.callgraph;
812 break;
813 case PERF_EVSEL__CONFIG_TERM_BRANCH:
814 if (term->val.branch && strcmp(term->val.branch, "no")) {
815 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
816 parse_branch_str(term->val.branch,
817 &attr->branch_sample_type);
818 } else
819 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
820 break;
821 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
822 dump_size = term->val.stack_user;
823 break;
824 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
825 max_stack = term->val.max_stack;
826 break;
827 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
828 evsel->max_events = term->val.max_events;
829 break;
830 case PERF_EVSEL__CONFIG_TERM_INHERIT:
831 /*
832 * attr->inherit should has already been set by
833 * perf_evsel__config. If user explicitly set
834 * inherit using config terms, override global
835 * opt->no_inherit setting.
836 */
837 attr->inherit = term->val.inherit ? 1 : 0;
838 break;
839 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
840 attr->write_backward = term->val.overwrite ? 1 : 0;
841 break;
842 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
843 break;
844 case PERF_EVSEL__CONFIG_TERM_PERCORE:
845 break;
846 case PERF_EVSEL__CONFIG_TERM_AUX_OUTPUT:
847 attr->aux_output = term->val.aux_output ? 1 : 0;
848 break;
849 default:
850 break;
851 }
852 }
853
854 /* User explicitly set per-event callgraph, clear the old setting and reset. */
855 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
856 bool sample_address = false;
857
858 if (max_stack) {
859 param.max_stack = max_stack;
860 if (callgraph_buf == NULL)
861 callgraph_buf = "fp";
862 }
863
864 /* parse callgraph parameters */
865 if (callgraph_buf != NULL) {
866 if (!strcmp(callgraph_buf, "no")) {
867 param.enabled = false;
868 param.record_mode = CALLCHAIN_NONE;
869 } else {
870 param.enabled = true;
871 if (parse_callchain_record(callgraph_buf, ¶m)) {
872 pr_err("per-event callgraph setting for %s failed. "
873 "Apply callgraph global setting for it\n",
874 evsel->name);
875 return;
876 }
877 if (param.record_mode == CALLCHAIN_DWARF)
878 sample_address = true;
879 }
880 }
881 if (dump_size > 0) {
882 dump_size = round_up(dump_size, sizeof(u64));
883 param.dump_size = dump_size;
884 }
885
886 /* If global callgraph set, clear it */
887 if (callchain_param.enabled)
888 perf_evsel__reset_callgraph(evsel, &callchain_param);
889
890 /* set perf-event callgraph */
891 if (param.enabled) {
892 if (sample_address) {
893 perf_evsel__set_sample_bit(evsel, ADDR);
894 perf_evsel__set_sample_bit(evsel, DATA_SRC);
895 evsel->core.attr.mmap_data = track;
896 }
897 perf_evsel__config_callchain(evsel, opts, ¶m);
898 }
899 }
900}
901
902static bool is_dummy_event(struct evsel *evsel)
903{
904 return (evsel->core.attr.type == PERF_TYPE_SOFTWARE) &&
905 (evsel->core.attr.config == PERF_COUNT_SW_DUMMY);
906}
907
908/*
909 * The enable_on_exec/disabled value strategy:
910 *
911 * 1) For any type of traced program:
912 * - all independent events and group leaders are disabled
913 * - all group members are enabled
914 *
915 * Group members are ruled by group leaders. They need to
916 * be enabled, because the group scheduling relies on that.
917 *
918 * 2) For traced programs executed by perf:
919 * - all independent events and group leaders have
920 * enable_on_exec set
921 * - we don't specifically enable or disable any event during
922 * the record command
923 *
924 * Independent events and group leaders are initially disabled
925 * and get enabled by exec. Group members are ruled by group
926 * leaders as stated in 1).
927 *
928 * 3) For traced programs attached by perf (pid/tid):
929 * - we specifically enable or disable all events during
930 * the record command
931 *
932 * When attaching events to already running traced we
933 * enable/disable events specifically, as there's no
934 * initial traced exec call.
935 */
936void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
937 struct callchain_param *callchain)
938{
939 struct evsel *leader = evsel->leader;
940 struct perf_event_attr *attr = &evsel->core.attr;
941 int track = evsel->tracking;
942 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
943
944 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
945 attr->inherit = !opts->no_inherit;
946 attr->write_backward = opts->overwrite ? 1 : 0;
947
948 perf_evsel__set_sample_bit(evsel, IP);
949 perf_evsel__set_sample_bit(evsel, TID);
950
951 if (evsel->sample_read) {
952 perf_evsel__set_sample_bit(evsel, READ);
953
954 /*
955 * We need ID even in case of single event, because
956 * PERF_SAMPLE_READ process ID specific data.
957 */
958 perf_evsel__set_sample_id(evsel, false);
959
960 /*
961 * Apply group format only if we belong to group
962 * with more than one members.
963 */
964 if (leader->core.nr_members > 1) {
965 attr->read_format |= PERF_FORMAT_GROUP;
966 attr->inherit = 0;
967 }
968 }
969
970 /*
971 * We default some events to have a default interval. But keep
972 * it a weak assumption overridable by the user.
973 */
974 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
975 opts->user_interval != ULLONG_MAX)) {
976 if (opts->freq) {
977 perf_evsel__set_sample_bit(evsel, PERIOD);
978 attr->freq = 1;
979 attr->sample_freq = opts->freq;
980 } else {
981 attr->sample_period = opts->default_interval;
982 }
983 }
984
985 /*
986 * Disable sampling for all group members other
987 * than leader in case leader 'leads' the sampling.
988 */
989 if ((leader != evsel) && leader->sample_read) {
990 attr->freq = 0;
991 attr->sample_freq = 0;
992 attr->sample_period = 0;
993 attr->write_backward = 0;
994
995 /*
996 * We don't get sample for slave events, we make them
997 * when delivering group leader sample. Set the slave
998 * event to follow the master sample_type to ease up
999 * report.
1000 */
1001 attr->sample_type = leader->core.attr.sample_type;
1002 }
1003
1004 if (opts->no_samples)
1005 attr->sample_freq = 0;
1006
1007 if (opts->inherit_stat) {
1008 evsel->core.attr.read_format |=
1009 PERF_FORMAT_TOTAL_TIME_ENABLED |
1010 PERF_FORMAT_TOTAL_TIME_RUNNING |
1011 PERF_FORMAT_ID;
1012 attr->inherit_stat = 1;
1013 }
1014
1015 if (opts->sample_address) {
1016 perf_evsel__set_sample_bit(evsel, ADDR);
1017 attr->mmap_data = track;
1018 }
1019
1020 /*
1021 * We don't allow user space callchains for function trace
1022 * event, due to issues with page faults while tracing page
1023 * fault handler and its overall trickiness nature.
1024 */
1025 if (perf_evsel__is_function_event(evsel))
1026 evsel->core.attr.exclude_callchain_user = 1;
1027
1028 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1029 perf_evsel__config_callchain(evsel, opts, callchain);
1030
1031 if (opts->sample_intr_regs) {
1032 attr->sample_regs_intr = opts->sample_intr_regs;
1033 perf_evsel__set_sample_bit(evsel, REGS_INTR);
1034 }
1035
1036 if (opts->sample_user_regs) {
1037 attr->sample_regs_user |= opts->sample_user_regs;
1038 perf_evsel__set_sample_bit(evsel, REGS_USER);
1039 }
1040
1041 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1042 perf_evsel__set_sample_bit(evsel, CPU);
1043
1044 /*
1045 * When the user explicitly disabled time don't force it here.
1046 */
1047 if (opts->sample_time &&
1048 (!perf_missing_features.sample_id_all &&
1049 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1050 opts->sample_time_set)))
1051 perf_evsel__set_sample_bit(evsel, TIME);
1052
1053 if (opts->raw_samples && !evsel->no_aux_samples) {
1054 perf_evsel__set_sample_bit(evsel, TIME);
1055 perf_evsel__set_sample_bit(evsel, RAW);
1056 perf_evsel__set_sample_bit(evsel, CPU);
1057 }
1058
1059 if (opts->sample_address)
1060 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1061
1062 if (opts->sample_phys_addr)
1063 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1064
1065 if (opts->no_buffering) {
1066 attr->watermark = 0;
1067 attr->wakeup_events = 1;
1068 }
1069 if (opts->branch_stack && !evsel->no_aux_samples) {
1070 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1071 attr->branch_sample_type = opts->branch_stack;
1072 }
1073
1074 if (opts->sample_weight)
1075 perf_evsel__set_sample_bit(evsel, WEIGHT);
1076
1077 attr->task = track;
1078 attr->mmap = track;
1079 attr->mmap2 = track && !perf_missing_features.mmap2;
1080 attr->comm = track;
1081 attr->ksymbol = track && !perf_missing_features.ksymbol;
1082 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1083
1084 if (opts->record_namespaces)
1085 attr->namespaces = track;
1086
1087 if (opts->record_switch_events)
1088 attr->context_switch = track;
1089
1090 if (opts->sample_transaction)
1091 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1092
1093 if (opts->running_time) {
1094 evsel->core.attr.read_format |=
1095 PERF_FORMAT_TOTAL_TIME_ENABLED |
1096 PERF_FORMAT_TOTAL_TIME_RUNNING;
1097 }
1098
1099 /*
1100 * XXX see the function comment above
1101 *
1102 * Disabling only independent events or group leaders,
1103 * keeping group members enabled.
1104 */
1105 if (perf_evsel__is_group_leader(evsel))
1106 attr->disabled = 1;
1107
1108 /*
1109 * Setting enable_on_exec for independent events and
1110 * group leaders for traced executed by perf.
1111 */
1112 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1113 !opts->initial_delay)
1114 attr->enable_on_exec = 1;
1115
1116 if (evsel->immediate) {
1117 attr->disabled = 0;
1118 attr->enable_on_exec = 0;
1119 }
1120
1121 clockid = opts->clockid;
1122 if (opts->use_clockid) {
1123 attr->use_clockid = 1;
1124 attr->clockid = opts->clockid;
1125 }
1126
1127 if (evsel->precise_max)
1128 attr->precise_ip = 3;
1129
1130 if (opts->all_user) {
1131 attr->exclude_kernel = 1;
1132 attr->exclude_user = 0;
1133 }
1134
1135 if (opts->all_kernel) {
1136 attr->exclude_kernel = 0;
1137 attr->exclude_user = 1;
1138 }
1139
1140 if (evsel->core.own_cpus || evsel->unit)
1141 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1142
1143 /*
1144 * Apply event specific term settings,
1145 * it overloads any global configuration.
1146 */
1147 apply_config_terms(evsel, opts, track);
1148
1149 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1150
1151 /* The --period option takes the precedence. */
1152 if (opts->period_set) {
1153 if (opts->period)
1154 perf_evsel__set_sample_bit(evsel, PERIOD);
1155 else
1156 perf_evsel__reset_sample_bit(evsel, PERIOD);
1157 }
1158
1159 /*
1160 * For initial_delay, a dummy event is added implicitly.
1161 * The software event will trigger -EOPNOTSUPP error out,
1162 * if BRANCH_STACK bit is set.
1163 */
1164 if (opts->initial_delay && is_dummy_event(evsel))
1165 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1166}
1167
1168int perf_evsel__set_filter(struct evsel *evsel, const char *filter)
1169{
1170 char *new_filter = strdup(filter);
1171
1172 if (new_filter != NULL) {
1173 free(evsel->filter);
1174 evsel->filter = new_filter;
1175 return 0;
1176 }
1177
1178 return -1;
1179}
1180
1181static int perf_evsel__append_filter(struct evsel *evsel,
1182 const char *fmt, const char *filter)
1183{
1184 char *new_filter;
1185
1186 if (evsel->filter == NULL)
1187 return perf_evsel__set_filter(evsel, filter);
1188
1189 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1190 free(evsel->filter);
1191 evsel->filter = new_filter;
1192 return 0;
1193 }
1194
1195 return -1;
1196}
1197
1198int perf_evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1199{
1200 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1201}
1202
1203int perf_evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1204{
1205 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1206}
1207
1208int evsel__enable(struct evsel *evsel)
1209{
1210 int err = perf_evsel__enable(&evsel->core);
1211
1212 if (!err)
1213 evsel->disabled = false;
1214
1215 return err;
1216}
1217
1218int evsel__disable(struct evsel *evsel)
1219{
1220 int err = perf_evsel__disable(&evsel->core);
1221 /*
1222 * We mark it disabled here so that tools that disable a event can
1223 * ignore events after they disable it. I.e. the ring buffer may have
1224 * already a few more events queued up before the kernel got the stop
1225 * request.
1226 */
1227 if (!err)
1228 evsel->disabled = true;
1229
1230 return err;
1231}
1232
1233static void perf_evsel__free_config_terms(struct evsel *evsel)
1234{
1235 struct perf_evsel_config_term *term, *h;
1236
1237 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1238 list_del_init(&term->list);
1239 free(term);
1240 }
1241}
1242
1243void perf_evsel__exit(struct evsel *evsel)
1244{
1245 assert(list_empty(&evsel->core.node));
1246 assert(evsel->evlist == NULL);
1247 perf_evsel__free_counts(evsel);
1248 perf_evsel__free_fd(&evsel->core);
1249 perf_evsel__free_id(&evsel->core);
1250 perf_evsel__free_config_terms(evsel);
1251 cgroup__put(evsel->cgrp);
1252 perf_cpu_map__put(evsel->core.cpus);
1253 perf_cpu_map__put(evsel->core.own_cpus);
1254 perf_thread_map__put(evsel->core.threads);
1255 zfree(&evsel->group_name);
1256 zfree(&evsel->name);
1257 perf_evsel__object.fini(evsel);
1258}
1259
1260void evsel__delete(struct evsel *evsel)
1261{
1262 perf_evsel__exit(evsel);
1263 free(evsel);
1264}
1265
1266void perf_evsel__compute_deltas(struct evsel *evsel, int cpu, int thread,
1267 struct perf_counts_values *count)
1268{
1269 struct perf_counts_values tmp;
1270
1271 if (!evsel->prev_raw_counts)
1272 return;
1273
1274 if (cpu == -1) {
1275 tmp = evsel->prev_raw_counts->aggr;
1276 evsel->prev_raw_counts->aggr = *count;
1277 } else {
1278 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1279 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1280 }
1281
1282 count->val = count->val - tmp.val;
1283 count->ena = count->ena - tmp.ena;
1284 count->run = count->run - tmp.run;
1285}
1286
1287void perf_counts_values__scale(struct perf_counts_values *count,
1288 bool scale, s8 *pscaled)
1289{
1290 s8 scaled = 0;
1291
1292 if (scale) {
1293 if (count->run == 0) {
1294 scaled = -1;
1295 count->val = 0;
1296 } else if (count->run < count->ena) {
1297 scaled = 1;
1298 count->val = (u64)((double) count->val * count->ena / count->run);
1299 }
1300 }
1301
1302 if (pscaled)
1303 *pscaled = scaled;
1304}
1305
1306static int
1307perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
1308{
1309 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1310
1311 return perf_evsel__read(&evsel->core, cpu, thread, count);
1312}
1313
1314static void
1315perf_evsel__set_count(struct evsel *counter, int cpu, int thread,
1316 u64 val, u64 ena, u64 run)
1317{
1318 struct perf_counts_values *count;
1319
1320 count = perf_counts(counter->counts, cpu, thread);
1321
1322 count->val = val;
1323 count->ena = ena;
1324 count->run = run;
1325
1326 perf_counts__set_loaded(counter->counts, cpu, thread, true);
1327}
1328
1329static int
1330perf_evsel__process_group_data(struct evsel *leader,
1331 int cpu, int thread, u64 *data)
1332{
1333 u64 read_format = leader->core.attr.read_format;
1334 struct sample_read_value *v;
1335 u64 nr, ena = 0, run = 0, i;
1336
1337 nr = *data++;
1338
1339 if (nr != (u64) leader->core.nr_members)
1340 return -EINVAL;
1341
1342 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1343 ena = *data++;
1344
1345 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1346 run = *data++;
1347
1348 v = (struct sample_read_value *) data;
1349
1350 perf_evsel__set_count(leader, cpu, thread,
1351 v[0].value, ena, run);
1352
1353 for (i = 1; i < nr; i++) {
1354 struct evsel *counter;
1355
1356 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1357 if (!counter)
1358 return -EINVAL;
1359
1360 perf_evsel__set_count(counter, cpu, thread,
1361 v[i].value, ena, run);
1362 }
1363
1364 return 0;
1365}
1366
1367static int
1368perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
1369{
1370 struct perf_stat_evsel *ps = leader->stats;
1371 u64 read_format = leader->core.attr.read_format;
1372 int size = perf_evsel__read_size(&leader->core);
1373 u64 *data = ps->group_data;
1374
1375 if (!(read_format & PERF_FORMAT_ID))
1376 return -EINVAL;
1377
1378 if (!perf_evsel__is_group_leader(leader))
1379 return -EINVAL;
1380
1381 if (!data) {
1382 data = zalloc(size);
1383 if (!data)
1384 return -ENOMEM;
1385
1386 ps->group_data = data;
1387 }
1388
1389 if (FD(leader, cpu, thread) < 0)
1390 return -EINVAL;
1391
1392 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1393 return -errno;
1394
1395 return perf_evsel__process_group_data(leader, cpu, thread, data);
1396}
1397
1398int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread)
1399{
1400 u64 read_format = evsel->core.attr.read_format;
1401
1402 if (read_format & PERF_FORMAT_GROUP)
1403 return perf_evsel__read_group(evsel, cpu, thread);
1404 else
1405 return perf_evsel__read_one(evsel, cpu, thread);
1406}
1407
1408int __perf_evsel__read_on_cpu(struct evsel *evsel,
1409 int cpu, int thread, bool scale)
1410{
1411 struct perf_counts_values count;
1412 size_t nv = scale ? 3 : 1;
1413
1414 if (FD(evsel, cpu, thread) < 0)
1415 return -EINVAL;
1416
1417 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1418 return -ENOMEM;
1419
1420 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1421 return -errno;
1422
1423 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1424 perf_counts_values__scale(&count, scale, NULL);
1425 *perf_counts(evsel->counts, cpu, thread) = count;
1426 return 0;
1427}
1428
1429static int get_group_fd(struct evsel *evsel, int cpu, int thread)
1430{
1431 struct evsel *leader = evsel->leader;
1432 int fd;
1433
1434 if (perf_evsel__is_group_leader(evsel))
1435 return -1;
1436
1437 /*
1438 * Leader must be already processed/open,
1439 * if not it's a bug.
1440 */
1441 BUG_ON(!leader->core.fd);
1442
1443 fd = FD(leader, cpu, thread);
1444 BUG_ON(fd == -1);
1445
1446 return fd;
1447}
1448
1449static void perf_evsel__remove_fd(struct evsel *pos,
1450 int nr_cpus, int nr_threads,
1451 int thread_idx)
1452{
1453 for (int cpu = 0; cpu < nr_cpus; cpu++)
1454 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1455 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1456}
1457
1458static int update_fds(struct evsel *evsel,
1459 int nr_cpus, int cpu_idx,
1460 int nr_threads, int thread_idx)
1461{
1462 struct evsel *pos;
1463
1464 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1465 return -EINVAL;
1466
1467 evlist__for_each_entry(evsel->evlist, pos) {
1468 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1469
1470 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1471
1472 /*
1473 * Since fds for next evsel has not been created,
1474 * there is no need to iterate whole event list.
1475 */
1476 if (pos == evsel)
1477 break;
1478 }
1479 return 0;
1480}
1481
1482static bool ignore_missing_thread(struct evsel *evsel,
1483 int nr_cpus, int cpu,
1484 struct perf_thread_map *threads,
1485 int thread, int err)
1486{
1487 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1488
1489 if (!evsel->ignore_missing_thread)
1490 return false;
1491
1492 /* The system wide setup does not work with threads. */
1493 if (evsel->core.system_wide)
1494 return false;
1495
1496 /* The -ESRCH is perf event syscall errno for pid's not found. */
1497 if (err != -ESRCH)
1498 return false;
1499
1500 /* If there's only one thread, let it fail. */
1501 if (threads->nr == 1)
1502 return false;
1503
1504 /*
1505 * We should remove fd for missing_thread first
1506 * because thread_map__remove() will decrease threads->nr.
1507 */
1508 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1509 return false;
1510
1511 if (thread_map__remove(threads, thread))
1512 return false;
1513
1514 pr_warning("WARNING: Ignored open failure for pid %d\n",
1515 ignore_pid);
1516 return true;
1517}
1518
1519static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1520 void *priv __maybe_unused)
1521{
1522 return fprintf(fp, " %-32s %s\n", name, val);
1523}
1524
1525static void display_attr(struct perf_event_attr *attr)
1526{
1527 if (verbose >= 2) {
1528 fprintf(stderr, "%.60s\n", graph_dotted_line);
1529 fprintf(stderr, "perf_event_attr:\n");
1530 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1531 fprintf(stderr, "%.60s\n", graph_dotted_line);
1532 }
1533}
1534
1535static int perf_event_open(struct evsel *evsel,
1536 pid_t pid, int cpu, int group_fd,
1537 unsigned long flags)
1538{
1539 int precise_ip = evsel->core.attr.precise_ip;
1540 int fd;
1541
1542 while (1) {
1543 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1544 pid, cpu, group_fd, flags);
1545
1546 fd = sys_perf_event_open(&evsel->core.attr, pid, cpu, group_fd, flags);
1547 if (fd >= 0)
1548 break;
1549
1550 /* Do not try less precise if not requested. */
1551 if (!evsel->precise_max)
1552 break;
1553
1554 /*
1555 * We tried all the precise_ip values, and it's
1556 * still failing, so leave it to standard fallback.
1557 */
1558 if (!evsel->core.attr.precise_ip) {
1559 evsel->core.attr.precise_ip = precise_ip;
1560 break;
1561 }
1562
1563 pr_debug2("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1564 evsel->core.attr.precise_ip--;
1565 pr_debug2("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1566 display_attr(&evsel->core.attr);
1567 }
1568
1569 return fd;
1570}
1571
1572int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
1573 struct perf_thread_map *threads)
1574{
1575 int cpu, thread, nthreads;
1576 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1577 int pid = -1, err;
1578 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1579
1580 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1581 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1582 return -EINVAL;
1583
1584 if (cpus == NULL) {
1585 static struct perf_cpu_map *empty_cpu_map;
1586
1587 if (empty_cpu_map == NULL) {
1588 empty_cpu_map = perf_cpu_map__dummy_new();
1589 if (empty_cpu_map == NULL)
1590 return -ENOMEM;
1591 }
1592
1593 cpus = empty_cpu_map;
1594 }
1595
1596 if (threads == NULL) {
1597 static struct perf_thread_map *empty_thread_map;
1598
1599 if (empty_thread_map == NULL) {
1600 empty_thread_map = thread_map__new_by_tid(-1);
1601 if (empty_thread_map == NULL)
1602 return -ENOMEM;
1603 }
1604
1605 threads = empty_thread_map;
1606 }
1607
1608 if (evsel->core.system_wide)
1609 nthreads = 1;
1610 else
1611 nthreads = threads->nr;
1612
1613 if (evsel->core.fd == NULL &&
1614 perf_evsel__alloc_fd(&evsel->core, cpus->nr, nthreads) < 0)
1615 return -ENOMEM;
1616
1617 if (evsel->cgrp) {
1618 flags |= PERF_FLAG_PID_CGROUP;
1619 pid = evsel->cgrp->fd;
1620 }
1621
1622fallback_missing_features:
1623 if (perf_missing_features.clockid_wrong)
1624 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1625 if (perf_missing_features.clockid) {
1626 evsel->core.attr.use_clockid = 0;
1627 evsel->core.attr.clockid = 0;
1628 }
1629 if (perf_missing_features.cloexec)
1630 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1631 if (perf_missing_features.mmap2)
1632 evsel->core.attr.mmap2 = 0;
1633 if (perf_missing_features.exclude_guest)
1634 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1635 if (perf_missing_features.lbr_flags)
1636 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1637 PERF_SAMPLE_BRANCH_NO_CYCLES);
1638 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1639 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1640 if (perf_missing_features.ksymbol)
1641 evsel->core.attr.ksymbol = 0;
1642 if (perf_missing_features.bpf)
1643 evsel->core.attr.bpf_event = 0;
1644retry_sample_id:
1645 if (perf_missing_features.sample_id_all)
1646 evsel->core.attr.sample_id_all = 0;
1647
1648 display_attr(&evsel->core.attr);
1649
1650 for (cpu = 0; cpu < cpus->nr; cpu++) {
1651
1652 for (thread = 0; thread < nthreads; thread++) {
1653 int fd, group_fd;
1654
1655 if (!evsel->cgrp && !evsel->core.system_wide)
1656 pid = perf_thread_map__pid(threads, thread);
1657
1658 group_fd = get_group_fd(evsel, cpu, thread);
1659retry_open:
1660 test_attr__ready();
1661
1662 fd = perf_event_open(evsel, pid, cpus->map[cpu],
1663 group_fd, flags);
1664
1665 FD(evsel, cpu, thread) = fd;
1666
1667 if (fd < 0) {
1668 err = -errno;
1669
1670 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1671 /*
1672 * We just removed 1 thread, so take a step
1673 * back on thread index and lower the upper
1674 * nthreads limit.
1675 */
1676 nthreads--;
1677 thread--;
1678
1679 /* ... and pretend like nothing have happened. */
1680 err = 0;
1681 continue;
1682 }
1683
1684 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1685 err);
1686 goto try_fallback;
1687 }
1688
1689 pr_debug2(" = %d\n", fd);
1690
1691 if (evsel->bpf_fd >= 0) {
1692 int evt_fd = fd;
1693 int bpf_fd = evsel->bpf_fd;
1694
1695 err = ioctl(evt_fd,
1696 PERF_EVENT_IOC_SET_BPF,
1697 bpf_fd);
1698 if (err && errno != EEXIST) {
1699 pr_err("failed to attach bpf fd %d: %s\n",
1700 bpf_fd, strerror(errno));
1701 err = -EINVAL;
1702 goto out_close;
1703 }
1704 }
1705
1706 set_rlimit = NO_CHANGE;
1707
1708 /*
1709 * If we succeeded but had to kill clockid, fail and
1710 * have perf_evsel__open_strerror() print us a nice
1711 * error.
1712 */
1713 if (perf_missing_features.clockid ||
1714 perf_missing_features.clockid_wrong) {
1715 err = -EINVAL;
1716 goto out_close;
1717 }
1718 }
1719 }
1720
1721 return 0;
1722
1723try_fallback:
1724 /*
1725 * perf stat needs between 5 and 22 fds per CPU. When we run out
1726 * of them try to increase the limits.
1727 */
1728 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1729 struct rlimit l;
1730 int old_errno = errno;
1731
1732 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1733 if (set_rlimit == NO_CHANGE)
1734 l.rlim_cur = l.rlim_max;
1735 else {
1736 l.rlim_cur = l.rlim_max + 1000;
1737 l.rlim_max = l.rlim_cur;
1738 }
1739 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1740 set_rlimit++;
1741 errno = old_errno;
1742 goto retry_open;
1743 }
1744 }
1745 errno = old_errno;
1746 }
1747
1748 if (err != -EINVAL || cpu > 0 || thread > 0)
1749 goto out_close;
1750
1751 /*
1752 * Must probe features in the order they were added to the
1753 * perf_event_attr interface.
1754 */
1755 if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1756 perf_missing_features.aux_output = true;
1757 pr_debug2("Kernel has no attr.aux_output support, bailing out\n");
1758 goto out_close;
1759 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1760 perf_missing_features.bpf = true;
1761 pr_debug2("switching off bpf_event\n");
1762 goto fallback_missing_features;
1763 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1764 perf_missing_features.ksymbol = true;
1765 pr_debug2("switching off ksymbol\n");
1766 goto fallback_missing_features;
1767 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1768 perf_missing_features.write_backward = true;
1769 pr_debug2("switching off write_backward\n");
1770 goto out_close;
1771 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1772 perf_missing_features.clockid_wrong = true;
1773 pr_debug2("switching off clockid\n");
1774 goto fallback_missing_features;
1775 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1776 perf_missing_features.clockid = true;
1777 pr_debug2("switching off use_clockid\n");
1778 goto fallback_missing_features;
1779 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1780 perf_missing_features.cloexec = true;
1781 pr_debug2("switching off cloexec flag\n");
1782 goto fallback_missing_features;
1783 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1784 perf_missing_features.mmap2 = true;
1785 pr_debug2("switching off mmap2\n");
1786 goto fallback_missing_features;
1787 } else if (!perf_missing_features.exclude_guest &&
1788 (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host)) {
1789 perf_missing_features.exclude_guest = true;
1790 pr_debug2("switching off exclude_guest, exclude_host\n");
1791 goto fallback_missing_features;
1792 } else if (!perf_missing_features.sample_id_all) {
1793 perf_missing_features.sample_id_all = true;
1794 pr_debug2("switching off sample_id_all\n");
1795 goto retry_sample_id;
1796 } else if (!perf_missing_features.lbr_flags &&
1797 (evsel->core.attr.branch_sample_type &
1798 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1799 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1800 perf_missing_features.lbr_flags = true;
1801 pr_debug2("switching off branch sample type no (cycles/flags)\n");
1802 goto fallback_missing_features;
1803 } else if (!perf_missing_features.group_read &&
1804 evsel->core.attr.inherit &&
1805 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1806 perf_evsel__is_group_leader(evsel)) {
1807 perf_missing_features.group_read = true;
1808 pr_debug2("switching off group read\n");
1809 goto fallback_missing_features;
1810 }
1811out_close:
1812 if (err)
1813 threads->err_thread = thread;
1814
1815 do {
1816 while (--thread >= 0) {
1817 close(FD(evsel, cpu, thread));
1818 FD(evsel, cpu, thread) = -1;
1819 }
1820 thread = nthreads;
1821 } while (--cpu >= 0);
1822 return err;
1823}
1824
1825void evsel__close(struct evsel *evsel)
1826{
1827 perf_evsel__close(&evsel->core);
1828 perf_evsel__free_id(&evsel->core);
1829}
1830
1831int perf_evsel__open_per_cpu(struct evsel *evsel,
1832 struct perf_cpu_map *cpus)
1833{
1834 return evsel__open(evsel, cpus, NULL);
1835}
1836
1837int perf_evsel__open_per_thread(struct evsel *evsel,
1838 struct perf_thread_map *threads)
1839{
1840 return evsel__open(evsel, NULL, threads);
1841}
1842
1843static int perf_evsel__parse_id_sample(const struct evsel *evsel,
1844 const union perf_event *event,
1845 struct perf_sample *sample)
1846{
1847 u64 type = evsel->core.attr.sample_type;
1848 const __u64 *array = event->sample.array;
1849 bool swapped = evsel->needs_swap;
1850 union u64_swap u;
1851
1852 array += ((event->header.size -
1853 sizeof(event->header)) / sizeof(u64)) - 1;
1854
1855 if (type & PERF_SAMPLE_IDENTIFIER) {
1856 sample->id = *array;
1857 array--;
1858 }
1859
1860 if (type & PERF_SAMPLE_CPU) {
1861 u.val64 = *array;
1862 if (swapped) {
1863 /* undo swap of u64, then swap on individual u32s */
1864 u.val64 = bswap_64(u.val64);
1865 u.val32[0] = bswap_32(u.val32[0]);
1866 }
1867
1868 sample->cpu = u.val32[0];
1869 array--;
1870 }
1871
1872 if (type & PERF_SAMPLE_STREAM_ID) {
1873 sample->stream_id = *array;
1874 array--;
1875 }
1876
1877 if (type & PERF_SAMPLE_ID) {
1878 sample->id = *array;
1879 array--;
1880 }
1881
1882 if (type & PERF_SAMPLE_TIME) {
1883 sample->time = *array;
1884 array--;
1885 }
1886
1887 if (type & PERF_SAMPLE_TID) {
1888 u.val64 = *array;
1889 if (swapped) {
1890 /* undo swap of u64, then swap on individual u32s */
1891 u.val64 = bswap_64(u.val64);
1892 u.val32[0] = bswap_32(u.val32[0]);
1893 u.val32[1] = bswap_32(u.val32[1]);
1894 }
1895
1896 sample->pid = u.val32[0];
1897 sample->tid = u.val32[1];
1898 array--;
1899 }
1900
1901 return 0;
1902}
1903
1904static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1905 u64 size)
1906{
1907 return size > max_size || offset + size > endp;
1908}
1909
1910#define OVERFLOW_CHECK(offset, size, max_size) \
1911 do { \
1912 if (overflow(endp, (max_size), (offset), (size))) \
1913 return -EFAULT; \
1914 } while (0)
1915
1916#define OVERFLOW_CHECK_u64(offset) \
1917 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1918
1919static int
1920perf_event__check_size(union perf_event *event, unsigned int sample_size)
1921{
1922 /*
1923 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1924 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1925 * check the format does not go past the end of the event.
1926 */
1927 if (sample_size + sizeof(event->header) > event->header.size)
1928 return -EFAULT;
1929
1930 return 0;
1931}
1932
1933int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
1934 struct perf_sample *data)
1935{
1936 u64 type = evsel->core.attr.sample_type;
1937 bool swapped = evsel->needs_swap;
1938 const __u64 *array;
1939 u16 max_size = event->header.size;
1940 const void *endp = (void *)event + max_size;
1941 u64 sz;
1942
1943 /*
1944 * used for cross-endian analysis. See git commit 65014ab3
1945 * for why this goofiness is needed.
1946 */
1947 union u64_swap u;
1948
1949 memset(data, 0, sizeof(*data));
1950 data->cpu = data->pid = data->tid = -1;
1951 data->stream_id = data->id = data->time = -1ULL;
1952 data->period = evsel->core.attr.sample_period;
1953 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1954 data->misc = event->header.misc;
1955 data->id = -1ULL;
1956 data->data_src = PERF_MEM_DATA_SRC_NONE;
1957
1958 if (event->header.type != PERF_RECORD_SAMPLE) {
1959 if (!evsel->core.attr.sample_id_all)
1960 return 0;
1961 return perf_evsel__parse_id_sample(evsel, event, data);
1962 }
1963
1964 array = event->sample.array;
1965
1966 if (perf_event__check_size(event, evsel->sample_size))
1967 return -EFAULT;
1968
1969 if (type & PERF_SAMPLE_IDENTIFIER) {
1970 data->id = *array;
1971 array++;
1972 }
1973
1974 if (type & PERF_SAMPLE_IP) {
1975 data->ip = *array;
1976 array++;
1977 }
1978
1979 if (type & PERF_SAMPLE_TID) {
1980 u.val64 = *array;
1981 if (swapped) {
1982 /* undo swap of u64, then swap on individual u32s */
1983 u.val64 = bswap_64(u.val64);
1984 u.val32[0] = bswap_32(u.val32[0]);
1985 u.val32[1] = bswap_32(u.val32[1]);
1986 }
1987
1988 data->pid = u.val32[0];
1989 data->tid = u.val32[1];
1990 array++;
1991 }
1992
1993 if (type & PERF_SAMPLE_TIME) {
1994 data->time = *array;
1995 array++;
1996 }
1997
1998 if (type & PERF_SAMPLE_ADDR) {
1999 data->addr = *array;
2000 array++;
2001 }
2002
2003 if (type & PERF_SAMPLE_ID) {
2004 data->id = *array;
2005 array++;
2006 }
2007
2008 if (type & PERF_SAMPLE_STREAM_ID) {
2009 data->stream_id = *array;
2010 array++;
2011 }
2012
2013 if (type & PERF_SAMPLE_CPU) {
2014
2015 u.val64 = *array;
2016 if (swapped) {
2017 /* undo swap of u64, then swap on individual u32s */
2018 u.val64 = bswap_64(u.val64);
2019 u.val32[0] = bswap_32(u.val32[0]);
2020 }
2021
2022 data->cpu = u.val32[0];
2023 array++;
2024 }
2025
2026 if (type & PERF_SAMPLE_PERIOD) {
2027 data->period = *array;
2028 array++;
2029 }
2030
2031 if (type & PERF_SAMPLE_READ) {
2032 u64 read_format = evsel->core.attr.read_format;
2033
2034 OVERFLOW_CHECK_u64(array);
2035 if (read_format & PERF_FORMAT_GROUP)
2036 data->read.group.nr = *array;
2037 else
2038 data->read.one.value = *array;
2039
2040 array++;
2041
2042 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2043 OVERFLOW_CHECK_u64(array);
2044 data->read.time_enabled = *array;
2045 array++;
2046 }
2047
2048 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2049 OVERFLOW_CHECK_u64(array);
2050 data->read.time_running = *array;
2051 array++;
2052 }
2053
2054 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2055 if (read_format & PERF_FORMAT_GROUP) {
2056 const u64 max_group_nr = UINT64_MAX /
2057 sizeof(struct sample_read_value);
2058
2059 if (data->read.group.nr > max_group_nr)
2060 return -EFAULT;
2061 sz = data->read.group.nr *
2062 sizeof(struct sample_read_value);
2063 OVERFLOW_CHECK(array, sz, max_size);
2064 data->read.group.values =
2065 (struct sample_read_value *)array;
2066 array = (void *)array + sz;
2067 } else {
2068 OVERFLOW_CHECK_u64(array);
2069 data->read.one.id = *array;
2070 array++;
2071 }
2072 }
2073
2074 if (evsel__has_callchain(evsel)) {
2075 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2076
2077 OVERFLOW_CHECK_u64(array);
2078 data->callchain = (struct ip_callchain *)array++;
2079 if (data->callchain->nr > max_callchain_nr)
2080 return -EFAULT;
2081 sz = data->callchain->nr * sizeof(u64);
2082 OVERFLOW_CHECK(array, sz, max_size);
2083 array = (void *)array + sz;
2084 }
2085
2086 if (type & PERF_SAMPLE_RAW) {
2087 OVERFLOW_CHECK_u64(array);
2088 u.val64 = *array;
2089
2090 /*
2091 * Undo swap of u64, then swap on individual u32s,
2092 * get the size of the raw area and undo all of the
2093 * swap. The pevent interface handles endianity by
2094 * itself.
2095 */
2096 if (swapped) {
2097 u.val64 = bswap_64(u.val64);
2098 u.val32[0] = bswap_32(u.val32[0]);
2099 u.val32[1] = bswap_32(u.val32[1]);
2100 }
2101 data->raw_size = u.val32[0];
2102
2103 /*
2104 * The raw data is aligned on 64bits including the
2105 * u32 size, so it's safe to use mem_bswap_64.
2106 */
2107 if (swapped)
2108 mem_bswap_64((void *) array, data->raw_size);
2109
2110 array = (void *)array + sizeof(u32);
2111
2112 OVERFLOW_CHECK(array, data->raw_size, max_size);
2113 data->raw_data = (void *)array;
2114 array = (void *)array + data->raw_size;
2115 }
2116
2117 if (type & PERF_SAMPLE_BRANCH_STACK) {
2118 const u64 max_branch_nr = UINT64_MAX /
2119 sizeof(struct branch_entry);
2120
2121 OVERFLOW_CHECK_u64(array);
2122 data->branch_stack = (struct branch_stack *)array++;
2123
2124 if (data->branch_stack->nr > max_branch_nr)
2125 return -EFAULT;
2126 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2127 OVERFLOW_CHECK(array, sz, max_size);
2128 array = (void *)array + sz;
2129 }
2130
2131 if (type & PERF_SAMPLE_REGS_USER) {
2132 OVERFLOW_CHECK_u64(array);
2133 data->user_regs.abi = *array;
2134 array++;
2135
2136 if (data->user_regs.abi) {
2137 u64 mask = evsel->core.attr.sample_regs_user;
2138
2139 sz = hweight64(mask) * sizeof(u64);
2140 OVERFLOW_CHECK(array, sz, max_size);
2141 data->user_regs.mask = mask;
2142 data->user_regs.regs = (u64 *)array;
2143 array = (void *)array + sz;
2144 }
2145 }
2146
2147 if (type & PERF_SAMPLE_STACK_USER) {
2148 OVERFLOW_CHECK_u64(array);
2149 sz = *array++;
2150
2151 data->user_stack.offset = ((char *)(array - 1)
2152 - (char *) event);
2153
2154 if (!sz) {
2155 data->user_stack.size = 0;
2156 } else {
2157 OVERFLOW_CHECK(array, sz, max_size);
2158 data->user_stack.data = (char *)array;
2159 array = (void *)array + sz;
2160 OVERFLOW_CHECK_u64(array);
2161 data->user_stack.size = *array++;
2162 if (WARN_ONCE(data->user_stack.size > sz,
2163 "user stack dump failure\n"))
2164 return -EFAULT;
2165 }
2166 }
2167
2168 if (type & PERF_SAMPLE_WEIGHT) {
2169 OVERFLOW_CHECK_u64(array);
2170 data->weight = *array;
2171 array++;
2172 }
2173
2174 if (type & PERF_SAMPLE_DATA_SRC) {
2175 OVERFLOW_CHECK_u64(array);
2176 data->data_src = *array;
2177 array++;
2178 }
2179
2180 if (type & PERF_SAMPLE_TRANSACTION) {
2181 OVERFLOW_CHECK_u64(array);
2182 data->transaction = *array;
2183 array++;
2184 }
2185
2186 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2187 if (type & PERF_SAMPLE_REGS_INTR) {
2188 OVERFLOW_CHECK_u64(array);
2189 data->intr_regs.abi = *array;
2190 array++;
2191
2192 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2193 u64 mask = evsel->core.attr.sample_regs_intr;
2194
2195 sz = hweight64(mask) * sizeof(u64);
2196 OVERFLOW_CHECK(array, sz, max_size);
2197 data->intr_regs.mask = mask;
2198 data->intr_regs.regs = (u64 *)array;
2199 array = (void *)array + sz;
2200 }
2201 }
2202
2203 data->phys_addr = 0;
2204 if (type & PERF_SAMPLE_PHYS_ADDR) {
2205 data->phys_addr = *array;
2206 array++;
2207 }
2208
2209 return 0;
2210}
2211
2212int perf_evsel__parse_sample_timestamp(struct evsel *evsel,
2213 union perf_event *event,
2214 u64 *timestamp)
2215{
2216 u64 type = evsel->core.attr.sample_type;
2217 const __u64 *array;
2218
2219 if (!(type & PERF_SAMPLE_TIME))
2220 return -1;
2221
2222 if (event->header.type != PERF_RECORD_SAMPLE) {
2223 struct perf_sample data = {
2224 .time = -1ULL,
2225 };
2226
2227 if (!evsel->core.attr.sample_id_all)
2228 return -1;
2229 if (perf_evsel__parse_id_sample(evsel, event, &data))
2230 return -1;
2231
2232 *timestamp = data.time;
2233 return 0;
2234 }
2235
2236 array = event->sample.array;
2237
2238 if (perf_event__check_size(event, evsel->sample_size))
2239 return -EFAULT;
2240
2241 if (type & PERF_SAMPLE_IDENTIFIER)
2242 array++;
2243
2244 if (type & PERF_SAMPLE_IP)
2245 array++;
2246
2247 if (type & PERF_SAMPLE_TID)
2248 array++;
2249
2250 if (type & PERF_SAMPLE_TIME)
2251 *timestamp = *array;
2252
2253 return 0;
2254}
2255
2256struct tep_format_field *perf_evsel__field(struct evsel *evsel, const char *name)
2257{
2258 return tep_find_field(evsel->tp_format, name);
2259}
2260
2261void *perf_evsel__rawptr(struct evsel *evsel, struct perf_sample *sample,
2262 const char *name)
2263{
2264 struct tep_format_field *field = perf_evsel__field(evsel, name);
2265 int offset;
2266
2267 if (!field)
2268 return NULL;
2269
2270 offset = field->offset;
2271
2272 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2273 offset = *(int *)(sample->raw_data + field->offset);
2274 offset &= 0xffff;
2275 }
2276
2277 return sample->raw_data + offset;
2278}
2279
2280u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2281 bool needs_swap)
2282{
2283 u64 value;
2284 void *ptr = sample->raw_data + field->offset;
2285
2286 switch (field->size) {
2287 case 1:
2288 return *(u8 *)ptr;
2289 case 2:
2290 value = *(u16 *)ptr;
2291 break;
2292 case 4:
2293 value = *(u32 *)ptr;
2294 break;
2295 case 8:
2296 memcpy(&value, ptr, sizeof(u64));
2297 break;
2298 default:
2299 return 0;
2300 }
2301
2302 if (!needs_swap)
2303 return value;
2304
2305 switch (field->size) {
2306 case 2:
2307 return bswap_16(value);
2308 case 4:
2309 return bswap_32(value);
2310 case 8:
2311 return bswap_64(value);
2312 default:
2313 return 0;
2314 }
2315
2316 return 0;
2317}
2318
2319u64 perf_evsel__intval(struct evsel *evsel, struct perf_sample *sample,
2320 const char *name)
2321{
2322 struct tep_format_field *field = perf_evsel__field(evsel, name);
2323
2324 if (!field)
2325 return 0;
2326
2327 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2328}
2329
2330bool perf_evsel__fallback(struct evsel *evsel, int err,
2331 char *msg, size_t msgsize)
2332{
2333 int paranoid;
2334
2335 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2336 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2337 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2338 /*
2339 * If it's cycles then fall back to hrtimer based
2340 * cpu-clock-tick sw counter, which is always available even if
2341 * no PMU support.
2342 *
2343 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2344 * b0a873e).
2345 */
2346 scnprintf(msg, msgsize, "%s",
2347"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2348
2349 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2350 evsel->core.attr.config = PERF_COUNT_SW_CPU_CLOCK;
2351
2352 zfree(&evsel->name);
2353 return true;
2354 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2355 (paranoid = perf_event_paranoid()) > 1) {
2356 const char *name = perf_evsel__name(evsel);
2357 char *new_name;
2358 const char *sep = ":";
2359
2360 /* Is there already the separator in the name. */
2361 if (strchr(name, '/') ||
2362 strchr(name, ':'))
2363 sep = "";
2364
2365 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2366 return false;
2367
2368 if (evsel->name)
2369 free(evsel->name);
2370 evsel->name = new_name;
2371 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2372 "to fall back to excluding kernel and hypervisor "
2373 " samples", paranoid);
2374 evsel->core.attr.exclude_kernel = 1;
2375 evsel->core.attr.exclude_hv = 1;
2376
2377 return true;
2378 }
2379
2380 return false;
2381}
2382
2383static bool find_process(const char *name)
2384{
2385 size_t len = strlen(name);
2386 DIR *dir;
2387 struct dirent *d;
2388 int ret = -1;
2389
2390 dir = opendir(procfs__mountpoint());
2391 if (!dir)
2392 return false;
2393
2394 /* Walk through the directory. */
2395 while (ret && (d = readdir(dir)) != NULL) {
2396 char path[PATH_MAX];
2397 char *data;
2398 size_t size;
2399
2400 if ((d->d_type != DT_DIR) ||
2401 !strcmp(".", d->d_name) ||
2402 !strcmp("..", d->d_name))
2403 continue;
2404
2405 scnprintf(path, sizeof(path), "%s/%s/comm",
2406 procfs__mountpoint(), d->d_name);
2407
2408 if (filename__read_str(path, &data, &size))
2409 continue;
2410
2411 ret = strncmp(name, data, len);
2412 free(data);
2413 }
2414
2415 closedir(dir);
2416 return ret ? false : true;
2417}
2418
2419int perf_evsel__open_strerror(struct evsel *evsel, struct target *target,
2420 int err, char *msg, size_t size)
2421{
2422 char sbuf[STRERR_BUFSIZE];
2423 int printed = 0;
2424
2425 switch (err) {
2426 case EPERM:
2427 case EACCES:
2428 if (err == EPERM)
2429 printed = scnprintf(msg, size,
2430 "No permission to enable %s event.\n\n",
2431 perf_evsel__name(evsel));
2432
2433 return scnprintf(msg + printed, size - printed,
2434 "You may not have permission to collect %sstats.\n\n"
2435 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2436 "which controls use of the performance events system by\n"
2437 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2438 "The current value is %d:\n\n"
2439 " -1: Allow use of (almost) all events by all users\n"
2440 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2441 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2442 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2443 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2444 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2445 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2446 " kernel.perf_event_paranoid = -1\n" ,
2447 target->system_wide ? "system-wide " : "",
2448 perf_event_paranoid());
2449 case ENOENT:
2450 return scnprintf(msg, size, "The %s event is not supported.",
2451 perf_evsel__name(evsel));
2452 case EMFILE:
2453 return scnprintf(msg, size, "%s",
2454 "Too many events are opened.\n"
2455 "Probably the maximum number of open file descriptors has been reached.\n"
2456 "Hint: Try again after reducing the number of events.\n"
2457 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2458 case ENOMEM:
2459 if (evsel__has_callchain(evsel) &&
2460 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2461 return scnprintf(msg, size,
2462 "Not enough memory to setup event with callchain.\n"
2463 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2464 "Hint: Current value: %d", sysctl__max_stack());
2465 break;
2466 case ENODEV:
2467 if (target->cpu_list)
2468 return scnprintf(msg, size, "%s",
2469 "No such device - did you specify an out-of-range profile CPU?");
2470 break;
2471 case EOPNOTSUPP:
2472 if (evsel->core.attr.sample_period != 0)
2473 return scnprintf(msg, size,
2474 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2475 perf_evsel__name(evsel));
2476 if (evsel->core.attr.precise_ip)
2477 return scnprintf(msg, size, "%s",
2478 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2479#if defined(__i386__) || defined(__x86_64__)
2480 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
2481 return scnprintf(msg, size, "%s",
2482 "No hardware sampling interrupt available.\n");
2483#endif
2484 break;
2485 case EBUSY:
2486 if (find_process("oprofiled"))
2487 return scnprintf(msg, size,
2488 "The PMU counters are busy/taken by another profiler.\n"
2489 "We found oprofile daemon running, please stop it and try again.");
2490 break;
2491 case EINVAL:
2492 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
2493 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2494 if (perf_missing_features.clockid)
2495 return scnprintf(msg, size, "clockid feature not supported.");
2496 if (perf_missing_features.clockid_wrong)
2497 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2498 if (perf_missing_features.aux_output)
2499 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
2500 break;
2501 default:
2502 break;
2503 }
2504
2505 return scnprintf(msg, size,
2506 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2507 "/bin/dmesg | grep -i perf may provide additional information.\n",
2508 err, str_error_r(err, sbuf, sizeof(sbuf)),
2509 perf_evsel__name(evsel));
2510}
2511
2512struct perf_env *perf_evsel__env(struct evsel *evsel)
2513{
2514 if (evsel && evsel->evlist)
2515 return evsel->evlist->env;
2516 return &perf_env;
2517}
2518
2519static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
2520{
2521 int cpu, thread;
2522
2523 for (cpu = 0; cpu < xyarray__max_x(evsel->core.fd); cpu++) {
2524 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
2525 thread++) {
2526 int fd = FD(evsel, cpu, thread);
2527
2528 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
2529 cpu, thread, fd) < 0)
2530 return -1;
2531 }
2532 }
2533
2534 return 0;
2535}
2536
2537int perf_evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
2538{
2539 struct perf_cpu_map *cpus = evsel->core.cpus;
2540 struct perf_thread_map *threads = evsel->core.threads;
2541
2542 if (perf_evsel__alloc_id(&evsel->core, cpus->nr, threads->nr))
2543 return -ENOMEM;
2544
2545 return store_evsel_ids(evsel, evlist);
2546}