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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[mirror_ubuntu-artful-kernel.git] / tools / perf / util / evsel.c
1 /*
2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
3 *
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
5 * copyright notes.
6 *
7 * Released under the GPL v2. (and only v2, not any later version)
8 */
9
10 #include <byteswap.h>
11 #include <linux/bitops.h>
12 #include <api/fs/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
32 static 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 bool write_backward;
41 } perf_missing_features;
42
43 static clockid_t clockid;
44
45 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
46 {
47 return 0;
48 }
49
50 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
51 {
52 }
53
54 static struct {
55 size_t size;
56 int (*init)(struct perf_evsel *evsel);
57 void (*fini)(struct perf_evsel *evsel);
58 } perf_evsel__object = {
59 .size = sizeof(struct perf_evsel),
60 .init = perf_evsel__no_extra_init,
61 .fini = perf_evsel__no_extra_fini,
62 };
63
64 int perf_evsel__object_config(size_t object_size,
65 int (*init)(struct perf_evsel *evsel),
66 void (*fini)(struct perf_evsel *evsel))
67 {
68
69 if (object_size == 0)
70 goto set_methods;
71
72 if (perf_evsel__object.size > object_size)
73 return -EINVAL;
74
75 perf_evsel__object.size = object_size;
76
77 set_methods:
78 if (init != NULL)
79 perf_evsel__object.init = init;
80
81 if (fini != NULL)
82 perf_evsel__object.fini = fini;
83
84 return 0;
85 }
86
87 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
88
89 int __perf_evsel__sample_size(u64 sample_type)
90 {
91 u64 mask = sample_type & PERF_SAMPLE_MASK;
92 int size = 0;
93 int i;
94
95 for (i = 0; i < 64; i++) {
96 if (mask & (1ULL << i))
97 size++;
98 }
99
100 size *= sizeof(u64);
101
102 return size;
103 }
104
105 /**
106 * __perf_evsel__calc_id_pos - calculate id_pos.
107 * @sample_type: sample type
108 *
109 * This function returns the position of the event id (PERF_SAMPLE_ID or
110 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
111 * sample_event.
112 */
113 static int __perf_evsel__calc_id_pos(u64 sample_type)
114 {
115 int idx = 0;
116
117 if (sample_type & PERF_SAMPLE_IDENTIFIER)
118 return 0;
119
120 if (!(sample_type & PERF_SAMPLE_ID))
121 return -1;
122
123 if (sample_type & PERF_SAMPLE_IP)
124 idx += 1;
125
126 if (sample_type & PERF_SAMPLE_TID)
127 idx += 1;
128
129 if (sample_type & PERF_SAMPLE_TIME)
130 idx += 1;
131
132 if (sample_type & PERF_SAMPLE_ADDR)
133 idx += 1;
134
135 return idx;
136 }
137
138 /**
139 * __perf_evsel__calc_is_pos - calculate is_pos.
140 * @sample_type: sample type
141 *
142 * This function returns the position (counting backwards) of the event id
143 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
144 * sample_id_all is used there is an id sample appended to non-sample events.
145 */
146 static int __perf_evsel__calc_is_pos(u64 sample_type)
147 {
148 int idx = 1;
149
150 if (sample_type & PERF_SAMPLE_IDENTIFIER)
151 return 1;
152
153 if (!(sample_type & PERF_SAMPLE_ID))
154 return -1;
155
156 if (sample_type & PERF_SAMPLE_CPU)
157 idx += 1;
158
159 if (sample_type & PERF_SAMPLE_STREAM_ID)
160 idx += 1;
161
162 return idx;
163 }
164
165 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
166 {
167 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
168 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
169 }
170
171 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
172 enum perf_event_sample_format bit)
173 {
174 if (!(evsel->attr.sample_type & bit)) {
175 evsel->attr.sample_type |= bit;
176 evsel->sample_size += sizeof(u64);
177 perf_evsel__calc_id_pos(evsel);
178 }
179 }
180
181 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
182 enum perf_event_sample_format bit)
183 {
184 if (evsel->attr.sample_type & bit) {
185 evsel->attr.sample_type &= ~bit;
186 evsel->sample_size -= sizeof(u64);
187 perf_evsel__calc_id_pos(evsel);
188 }
189 }
190
191 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
192 bool can_sample_identifier)
193 {
194 if (can_sample_identifier) {
195 perf_evsel__reset_sample_bit(evsel, ID);
196 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
197 } else {
198 perf_evsel__set_sample_bit(evsel, ID);
199 }
200 evsel->attr.read_format |= PERF_FORMAT_ID;
201 }
202
203 /**
204 * perf_evsel__is_function_event - Return whether given evsel is a function
205 * trace event
206 *
207 * @evsel - evsel selector to be tested
208 *
209 * Return %true if event is function trace event
210 */
211 bool perf_evsel__is_function_event(struct perf_evsel *evsel)
212 {
213 #define FUNCTION_EVENT "ftrace:function"
214
215 return evsel->name &&
216 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
217
218 #undef FUNCTION_EVENT
219 }
220
221 void perf_evsel__init(struct perf_evsel *evsel,
222 struct perf_event_attr *attr, int idx)
223 {
224 evsel->idx = idx;
225 evsel->tracking = !idx;
226 evsel->attr = *attr;
227 evsel->leader = evsel;
228 evsel->unit = "";
229 evsel->scale = 1.0;
230 evsel->evlist = NULL;
231 evsel->bpf_fd = -1;
232 INIT_LIST_HEAD(&evsel->node);
233 INIT_LIST_HEAD(&evsel->config_terms);
234 perf_evsel__object.init(evsel);
235 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
236 perf_evsel__calc_id_pos(evsel);
237 evsel->cmdline_group_boundary = false;
238 }
239
240 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
241 {
242 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
243
244 if (evsel != NULL)
245 perf_evsel__init(evsel, attr, idx);
246
247 if (perf_evsel__is_bpf_output(evsel)) {
248 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
249 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
250 evsel->attr.sample_period = 1;
251 }
252
253 return evsel;
254 }
255
256 /*
257 * Returns pointer with encoded error via <linux/err.h> interface.
258 */
259 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
260 {
261 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
262 int err = -ENOMEM;
263
264 if (evsel == NULL) {
265 goto out_err;
266 } else {
267 struct perf_event_attr attr = {
268 .type = PERF_TYPE_TRACEPOINT,
269 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
270 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
271 };
272
273 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
274 goto out_free;
275
276 evsel->tp_format = trace_event__tp_format(sys, name);
277 if (IS_ERR(evsel->tp_format)) {
278 err = PTR_ERR(evsel->tp_format);
279 goto out_free;
280 }
281
282 event_attr_init(&attr);
283 attr.config = evsel->tp_format->id;
284 attr.sample_period = 1;
285 perf_evsel__init(evsel, &attr, idx);
286 }
287
288 return evsel;
289
290 out_free:
291 zfree(&evsel->name);
292 free(evsel);
293 out_err:
294 return ERR_PTR(err);
295 }
296
297 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
298 "cycles",
299 "instructions",
300 "cache-references",
301 "cache-misses",
302 "branches",
303 "branch-misses",
304 "bus-cycles",
305 "stalled-cycles-frontend",
306 "stalled-cycles-backend",
307 "ref-cycles",
308 };
309
310 static const char *__perf_evsel__hw_name(u64 config)
311 {
312 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
313 return perf_evsel__hw_names[config];
314
315 return "unknown-hardware";
316 }
317
318 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
319 {
320 int colon = 0, r = 0;
321 struct perf_event_attr *attr = &evsel->attr;
322 bool exclude_guest_default = false;
323
324 #define MOD_PRINT(context, mod) do { \
325 if (!attr->exclude_##context) { \
326 if (!colon) colon = ++r; \
327 r += scnprintf(bf + r, size - r, "%c", mod); \
328 } } while(0)
329
330 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
331 MOD_PRINT(kernel, 'k');
332 MOD_PRINT(user, 'u');
333 MOD_PRINT(hv, 'h');
334 exclude_guest_default = true;
335 }
336
337 if (attr->precise_ip) {
338 if (!colon)
339 colon = ++r;
340 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
341 exclude_guest_default = true;
342 }
343
344 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
345 MOD_PRINT(host, 'H');
346 MOD_PRINT(guest, 'G');
347 }
348 #undef MOD_PRINT
349 if (colon)
350 bf[colon - 1] = ':';
351 return r;
352 }
353
354 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
355 {
356 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
357 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
358 }
359
360 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
361 "cpu-clock",
362 "task-clock",
363 "page-faults",
364 "context-switches",
365 "cpu-migrations",
366 "minor-faults",
367 "major-faults",
368 "alignment-faults",
369 "emulation-faults",
370 "dummy",
371 };
372
373 static const char *__perf_evsel__sw_name(u64 config)
374 {
375 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
376 return perf_evsel__sw_names[config];
377 return "unknown-software";
378 }
379
380 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
381 {
382 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
383 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
384 }
385
386 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
387 {
388 int r;
389
390 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
391
392 if (type & HW_BREAKPOINT_R)
393 r += scnprintf(bf + r, size - r, "r");
394
395 if (type & HW_BREAKPOINT_W)
396 r += scnprintf(bf + r, size - r, "w");
397
398 if (type & HW_BREAKPOINT_X)
399 r += scnprintf(bf + r, size - r, "x");
400
401 return r;
402 }
403
404 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
405 {
406 struct perf_event_attr *attr = &evsel->attr;
407 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
408 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
409 }
410
411 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
412 [PERF_EVSEL__MAX_ALIASES] = {
413 { "L1-dcache", "l1-d", "l1d", "L1-data", },
414 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
415 { "LLC", "L2", },
416 { "dTLB", "d-tlb", "Data-TLB", },
417 { "iTLB", "i-tlb", "Instruction-TLB", },
418 { "branch", "branches", "bpu", "btb", "bpc", },
419 { "node", },
420 };
421
422 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
423 [PERF_EVSEL__MAX_ALIASES] = {
424 { "load", "loads", "read", },
425 { "store", "stores", "write", },
426 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
427 };
428
429 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
430 [PERF_EVSEL__MAX_ALIASES] = {
431 { "refs", "Reference", "ops", "access", },
432 { "misses", "miss", },
433 };
434
435 #define C(x) PERF_COUNT_HW_CACHE_##x
436 #define CACHE_READ (1 << C(OP_READ))
437 #define CACHE_WRITE (1 << C(OP_WRITE))
438 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
439 #define COP(x) (1 << x)
440
441 /*
442 * cache operartion stat
443 * L1I : Read and prefetch only
444 * ITLB and BPU : Read-only
445 */
446 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
447 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
448 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
449 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
450 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
451 [C(ITLB)] = (CACHE_READ),
452 [C(BPU)] = (CACHE_READ),
453 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
454 };
455
456 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
457 {
458 if (perf_evsel__hw_cache_stat[type] & COP(op))
459 return true; /* valid */
460 else
461 return false; /* invalid */
462 }
463
464 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
465 char *bf, size_t size)
466 {
467 if (result) {
468 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
469 perf_evsel__hw_cache_op[op][0],
470 perf_evsel__hw_cache_result[result][0]);
471 }
472
473 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
474 perf_evsel__hw_cache_op[op][1]);
475 }
476
477 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
478 {
479 u8 op, result, type = (config >> 0) & 0xff;
480 const char *err = "unknown-ext-hardware-cache-type";
481
482 if (type > PERF_COUNT_HW_CACHE_MAX)
483 goto out_err;
484
485 op = (config >> 8) & 0xff;
486 err = "unknown-ext-hardware-cache-op";
487 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
488 goto out_err;
489
490 result = (config >> 16) & 0xff;
491 err = "unknown-ext-hardware-cache-result";
492 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
493 goto out_err;
494
495 err = "invalid-cache";
496 if (!perf_evsel__is_cache_op_valid(type, op))
497 goto out_err;
498
499 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
500 out_err:
501 return scnprintf(bf, size, "%s", err);
502 }
503
504 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
505 {
506 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
507 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
508 }
509
510 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
511 {
512 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
513 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
514 }
515
516 const char *perf_evsel__name(struct perf_evsel *evsel)
517 {
518 char bf[128];
519
520 if (evsel->name)
521 return evsel->name;
522
523 switch (evsel->attr.type) {
524 case PERF_TYPE_RAW:
525 perf_evsel__raw_name(evsel, bf, sizeof(bf));
526 break;
527
528 case PERF_TYPE_HARDWARE:
529 perf_evsel__hw_name(evsel, bf, sizeof(bf));
530 break;
531
532 case PERF_TYPE_HW_CACHE:
533 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
534 break;
535
536 case PERF_TYPE_SOFTWARE:
537 perf_evsel__sw_name(evsel, bf, sizeof(bf));
538 break;
539
540 case PERF_TYPE_TRACEPOINT:
541 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
542 break;
543
544 case PERF_TYPE_BREAKPOINT:
545 perf_evsel__bp_name(evsel, bf, sizeof(bf));
546 break;
547
548 default:
549 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
550 evsel->attr.type);
551 break;
552 }
553
554 evsel->name = strdup(bf);
555
556 return evsel->name ?: "unknown";
557 }
558
559 const char *perf_evsel__group_name(struct perf_evsel *evsel)
560 {
561 return evsel->group_name ?: "anon group";
562 }
563
564 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
565 {
566 int ret;
567 struct perf_evsel *pos;
568 const char *group_name = perf_evsel__group_name(evsel);
569
570 ret = scnprintf(buf, size, "%s", group_name);
571
572 ret += scnprintf(buf + ret, size - ret, " { %s",
573 perf_evsel__name(evsel));
574
575 for_each_group_member(pos, evsel)
576 ret += scnprintf(buf + ret, size - ret, ", %s",
577 perf_evsel__name(pos));
578
579 ret += scnprintf(buf + ret, size - ret, " }");
580
581 return ret;
582 }
583
584 void perf_evsel__config_callchain(struct perf_evsel *evsel,
585 struct record_opts *opts,
586 struct callchain_param *param)
587 {
588 bool function = perf_evsel__is_function_event(evsel);
589 struct perf_event_attr *attr = &evsel->attr;
590
591 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
592
593 attr->sample_max_stack = param->max_stack;
594
595 if (param->record_mode == CALLCHAIN_LBR) {
596 if (!opts->branch_stack) {
597 if (attr->exclude_user) {
598 pr_warning("LBR callstack option is only available "
599 "to get user callchain information. "
600 "Falling back to framepointers.\n");
601 } else {
602 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
603 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
604 PERF_SAMPLE_BRANCH_CALL_STACK |
605 PERF_SAMPLE_BRANCH_NO_CYCLES |
606 PERF_SAMPLE_BRANCH_NO_FLAGS;
607 }
608 } else
609 pr_warning("Cannot use LBR callstack with branch stack. "
610 "Falling back to framepointers.\n");
611 }
612
613 if (param->record_mode == CALLCHAIN_DWARF) {
614 if (!function) {
615 perf_evsel__set_sample_bit(evsel, REGS_USER);
616 perf_evsel__set_sample_bit(evsel, STACK_USER);
617 attr->sample_regs_user = PERF_REGS_MASK;
618 attr->sample_stack_user = param->dump_size;
619 attr->exclude_callchain_user = 1;
620 } else {
621 pr_info("Cannot use DWARF unwind for function trace event,"
622 " falling back to framepointers.\n");
623 }
624 }
625
626 if (function) {
627 pr_info("Disabling user space callchains for function trace event.\n");
628 attr->exclude_callchain_user = 1;
629 }
630 }
631
632 static void
633 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
634 struct callchain_param *param)
635 {
636 struct perf_event_attr *attr = &evsel->attr;
637
638 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
639 if (param->record_mode == CALLCHAIN_LBR) {
640 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
641 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
642 PERF_SAMPLE_BRANCH_CALL_STACK);
643 }
644 if (param->record_mode == CALLCHAIN_DWARF) {
645 perf_evsel__reset_sample_bit(evsel, REGS_USER);
646 perf_evsel__reset_sample_bit(evsel, STACK_USER);
647 }
648 }
649
650 static void apply_config_terms(struct perf_evsel *evsel,
651 struct record_opts *opts)
652 {
653 struct perf_evsel_config_term *term;
654 struct list_head *config_terms = &evsel->config_terms;
655 struct perf_event_attr *attr = &evsel->attr;
656 struct callchain_param param;
657 u32 dump_size = 0;
658 int max_stack = 0;
659 const char *callgraph_buf = NULL;
660
661 /* callgraph default */
662 param.record_mode = callchain_param.record_mode;
663
664 list_for_each_entry(term, config_terms, list) {
665 switch (term->type) {
666 case PERF_EVSEL__CONFIG_TERM_PERIOD:
667 attr->sample_period = term->val.period;
668 attr->freq = 0;
669 break;
670 case PERF_EVSEL__CONFIG_TERM_FREQ:
671 attr->sample_freq = term->val.freq;
672 attr->freq = 1;
673 break;
674 case PERF_EVSEL__CONFIG_TERM_TIME:
675 if (term->val.time)
676 perf_evsel__set_sample_bit(evsel, TIME);
677 else
678 perf_evsel__reset_sample_bit(evsel, TIME);
679 break;
680 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
681 callgraph_buf = term->val.callgraph;
682 break;
683 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
684 dump_size = term->val.stack_user;
685 break;
686 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
687 max_stack = term->val.max_stack;
688 break;
689 case PERF_EVSEL__CONFIG_TERM_INHERIT:
690 /*
691 * attr->inherit should has already been set by
692 * perf_evsel__config. If user explicitly set
693 * inherit using config terms, override global
694 * opt->no_inherit setting.
695 */
696 attr->inherit = term->val.inherit ? 1 : 0;
697 break;
698 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
699 attr->write_backward = term->val.overwrite ? 1 : 0;
700 break;
701 default:
702 break;
703 }
704 }
705
706 /* User explicitly set per-event callgraph, clear the old setting and reset. */
707 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
708 if (max_stack) {
709 param.max_stack = max_stack;
710 if (callgraph_buf == NULL)
711 callgraph_buf = "fp";
712 }
713
714 /* parse callgraph parameters */
715 if (callgraph_buf != NULL) {
716 if (!strcmp(callgraph_buf, "no")) {
717 param.enabled = false;
718 param.record_mode = CALLCHAIN_NONE;
719 } else {
720 param.enabled = true;
721 if (parse_callchain_record(callgraph_buf, &param)) {
722 pr_err("per-event callgraph setting for %s failed. "
723 "Apply callgraph global setting for it\n",
724 evsel->name);
725 return;
726 }
727 }
728 }
729 if (dump_size > 0) {
730 dump_size = round_up(dump_size, sizeof(u64));
731 param.dump_size = dump_size;
732 }
733
734 /* If global callgraph set, clear it */
735 if (callchain_param.enabled)
736 perf_evsel__reset_callgraph(evsel, &callchain_param);
737
738 /* set perf-event callgraph */
739 if (param.enabled)
740 perf_evsel__config_callchain(evsel, opts, &param);
741 }
742 }
743
744 /*
745 * The enable_on_exec/disabled value strategy:
746 *
747 * 1) For any type of traced program:
748 * - all independent events and group leaders are disabled
749 * - all group members are enabled
750 *
751 * Group members are ruled by group leaders. They need to
752 * be enabled, because the group scheduling relies on that.
753 *
754 * 2) For traced programs executed by perf:
755 * - all independent events and group leaders have
756 * enable_on_exec set
757 * - we don't specifically enable or disable any event during
758 * the record command
759 *
760 * Independent events and group leaders are initially disabled
761 * and get enabled by exec. Group members are ruled by group
762 * leaders as stated in 1).
763 *
764 * 3) For traced programs attached by perf (pid/tid):
765 * - we specifically enable or disable all events during
766 * the record command
767 *
768 * When attaching events to already running traced we
769 * enable/disable events specifically, as there's no
770 * initial traced exec call.
771 */
772 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
773 struct callchain_param *callchain)
774 {
775 struct perf_evsel *leader = evsel->leader;
776 struct perf_event_attr *attr = &evsel->attr;
777 int track = evsel->tracking;
778 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
779
780 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
781 attr->inherit = !opts->no_inherit;
782 attr->write_backward = opts->overwrite ? 1 : 0;
783
784 perf_evsel__set_sample_bit(evsel, IP);
785 perf_evsel__set_sample_bit(evsel, TID);
786
787 if (evsel->sample_read) {
788 perf_evsel__set_sample_bit(evsel, READ);
789
790 /*
791 * We need ID even in case of single event, because
792 * PERF_SAMPLE_READ process ID specific data.
793 */
794 perf_evsel__set_sample_id(evsel, false);
795
796 /*
797 * Apply group format only if we belong to group
798 * with more than one members.
799 */
800 if (leader->nr_members > 1) {
801 attr->read_format |= PERF_FORMAT_GROUP;
802 attr->inherit = 0;
803 }
804 }
805
806 /*
807 * We default some events to have a default interval. But keep
808 * it a weak assumption overridable by the user.
809 */
810 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
811 opts->user_interval != ULLONG_MAX)) {
812 if (opts->freq) {
813 perf_evsel__set_sample_bit(evsel, PERIOD);
814 attr->freq = 1;
815 attr->sample_freq = opts->freq;
816 } else {
817 attr->sample_period = opts->default_interval;
818 }
819 }
820
821 /*
822 * Disable sampling for all group members other
823 * than leader in case leader 'leads' the sampling.
824 */
825 if ((leader != evsel) && leader->sample_read) {
826 attr->sample_freq = 0;
827 attr->sample_period = 0;
828 }
829
830 if (opts->no_samples)
831 attr->sample_freq = 0;
832
833 if (opts->inherit_stat)
834 attr->inherit_stat = 1;
835
836 if (opts->sample_address) {
837 perf_evsel__set_sample_bit(evsel, ADDR);
838 attr->mmap_data = track;
839 }
840
841 /*
842 * We don't allow user space callchains for function trace
843 * event, due to issues with page faults while tracing page
844 * fault handler and its overall trickiness nature.
845 */
846 if (perf_evsel__is_function_event(evsel))
847 evsel->attr.exclude_callchain_user = 1;
848
849 if (callchain && callchain->enabled && !evsel->no_aux_samples)
850 perf_evsel__config_callchain(evsel, opts, callchain);
851
852 if (opts->sample_intr_regs) {
853 attr->sample_regs_intr = opts->sample_intr_regs;
854 perf_evsel__set_sample_bit(evsel, REGS_INTR);
855 }
856
857 if (target__has_cpu(&opts->target))
858 perf_evsel__set_sample_bit(evsel, CPU);
859
860 if (opts->period)
861 perf_evsel__set_sample_bit(evsel, PERIOD);
862
863 /*
864 * When the user explicitly disabled time don't force it here.
865 */
866 if (opts->sample_time &&
867 (!perf_missing_features.sample_id_all &&
868 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
869 opts->sample_time_set)))
870 perf_evsel__set_sample_bit(evsel, TIME);
871
872 if (opts->raw_samples && !evsel->no_aux_samples) {
873 perf_evsel__set_sample_bit(evsel, TIME);
874 perf_evsel__set_sample_bit(evsel, RAW);
875 perf_evsel__set_sample_bit(evsel, CPU);
876 }
877
878 if (opts->sample_address)
879 perf_evsel__set_sample_bit(evsel, DATA_SRC);
880
881 if (opts->no_buffering) {
882 attr->watermark = 0;
883 attr->wakeup_events = 1;
884 }
885 if (opts->branch_stack && !evsel->no_aux_samples) {
886 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
887 attr->branch_sample_type = opts->branch_stack;
888 }
889
890 if (opts->sample_weight)
891 perf_evsel__set_sample_bit(evsel, WEIGHT);
892
893 attr->task = track;
894 attr->mmap = track;
895 attr->mmap2 = track && !perf_missing_features.mmap2;
896 attr->comm = track;
897
898 if (opts->record_switch_events)
899 attr->context_switch = track;
900
901 if (opts->sample_transaction)
902 perf_evsel__set_sample_bit(evsel, TRANSACTION);
903
904 if (opts->running_time) {
905 evsel->attr.read_format |=
906 PERF_FORMAT_TOTAL_TIME_ENABLED |
907 PERF_FORMAT_TOTAL_TIME_RUNNING;
908 }
909
910 /*
911 * XXX see the function comment above
912 *
913 * Disabling only independent events or group leaders,
914 * keeping group members enabled.
915 */
916 if (perf_evsel__is_group_leader(evsel))
917 attr->disabled = 1;
918
919 /*
920 * Setting enable_on_exec for independent events and
921 * group leaders for traced executed by perf.
922 */
923 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
924 !opts->initial_delay)
925 attr->enable_on_exec = 1;
926
927 if (evsel->immediate) {
928 attr->disabled = 0;
929 attr->enable_on_exec = 0;
930 }
931
932 clockid = opts->clockid;
933 if (opts->use_clockid) {
934 attr->use_clockid = 1;
935 attr->clockid = opts->clockid;
936 }
937
938 if (evsel->precise_max)
939 perf_event_attr__set_max_precise_ip(attr);
940
941 if (opts->all_user) {
942 attr->exclude_kernel = 1;
943 attr->exclude_user = 0;
944 }
945
946 if (opts->all_kernel) {
947 attr->exclude_kernel = 0;
948 attr->exclude_user = 1;
949 }
950
951 /*
952 * Apply event specific term settings,
953 * it overloads any global configuration.
954 */
955 apply_config_terms(evsel, opts);
956 }
957
958 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
959 {
960 int cpu, thread;
961
962 if (evsel->system_wide)
963 nthreads = 1;
964
965 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
966
967 if (evsel->fd) {
968 for (cpu = 0; cpu < ncpus; cpu++) {
969 for (thread = 0; thread < nthreads; thread++) {
970 FD(evsel, cpu, thread) = -1;
971 }
972 }
973 }
974
975 return evsel->fd != NULL ? 0 : -ENOMEM;
976 }
977
978 static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
979 int ioc, void *arg)
980 {
981 int cpu, thread;
982
983 if (evsel->system_wide)
984 nthreads = 1;
985
986 for (cpu = 0; cpu < ncpus; cpu++) {
987 for (thread = 0; thread < nthreads; thread++) {
988 int fd = FD(evsel, cpu, thread),
989 err = ioctl(fd, ioc, arg);
990
991 if (err)
992 return err;
993 }
994 }
995
996 return 0;
997 }
998
999 int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
1000 const char *filter)
1001 {
1002 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1003 PERF_EVENT_IOC_SET_FILTER,
1004 (void *)filter);
1005 }
1006
1007 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1008 {
1009 char *new_filter = strdup(filter);
1010
1011 if (new_filter != NULL) {
1012 free(evsel->filter);
1013 evsel->filter = new_filter;
1014 return 0;
1015 }
1016
1017 return -1;
1018 }
1019
1020 int perf_evsel__append_filter(struct perf_evsel *evsel,
1021 const char *op, const char *filter)
1022 {
1023 char *new_filter;
1024
1025 if (evsel->filter == NULL)
1026 return perf_evsel__set_filter(evsel, filter);
1027
1028 if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
1029 free(evsel->filter);
1030 evsel->filter = new_filter;
1031 return 0;
1032 }
1033
1034 return -1;
1035 }
1036
1037 int perf_evsel__enable(struct perf_evsel *evsel)
1038 {
1039 int nthreads = thread_map__nr(evsel->threads);
1040 int ncpus = cpu_map__nr(evsel->cpus);
1041
1042 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1043 PERF_EVENT_IOC_ENABLE,
1044 0);
1045 }
1046
1047 int perf_evsel__disable(struct perf_evsel *evsel)
1048 {
1049 int nthreads = thread_map__nr(evsel->threads);
1050 int ncpus = cpu_map__nr(evsel->cpus);
1051
1052 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1053 PERF_EVENT_IOC_DISABLE,
1054 0);
1055 }
1056
1057 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1058 {
1059 if (ncpus == 0 || nthreads == 0)
1060 return 0;
1061
1062 if (evsel->system_wide)
1063 nthreads = 1;
1064
1065 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1066 if (evsel->sample_id == NULL)
1067 return -ENOMEM;
1068
1069 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1070 if (evsel->id == NULL) {
1071 xyarray__delete(evsel->sample_id);
1072 evsel->sample_id = NULL;
1073 return -ENOMEM;
1074 }
1075
1076 return 0;
1077 }
1078
1079 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1080 {
1081 xyarray__delete(evsel->fd);
1082 evsel->fd = NULL;
1083 }
1084
1085 static void perf_evsel__free_id(struct perf_evsel *evsel)
1086 {
1087 xyarray__delete(evsel->sample_id);
1088 evsel->sample_id = NULL;
1089 zfree(&evsel->id);
1090 }
1091
1092 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1093 {
1094 struct perf_evsel_config_term *term, *h;
1095
1096 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1097 list_del(&term->list);
1098 free(term);
1099 }
1100 }
1101
1102 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1103 {
1104 int cpu, thread;
1105
1106 if (evsel->system_wide)
1107 nthreads = 1;
1108
1109 for (cpu = 0; cpu < ncpus; cpu++)
1110 for (thread = 0; thread < nthreads; ++thread) {
1111 close(FD(evsel, cpu, thread));
1112 FD(evsel, cpu, thread) = -1;
1113 }
1114 }
1115
1116 void perf_evsel__exit(struct perf_evsel *evsel)
1117 {
1118 assert(list_empty(&evsel->node));
1119 assert(evsel->evlist == NULL);
1120 perf_evsel__free_fd(evsel);
1121 perf_evsel__free_id(evsel);
1122 perf_evsel__free_config_terms(evsel);
1123 close_cgroup(evsel->cgrp);
1124 cpu_map__put(evsel->cpus);
1125 cpu_map__put(evsel->own_cpus);
1126 thread_map__put(evsel->threads);
1127 zfree(&evsel->group_name);
1128 zfree(&evsel->name);
1129 perf_evsel__object.fini(evsel);
1130 }
1131
1132 void perf_evsel__delete(struct perf_evsel *evsel)
1133 {
1134 perf_evsel__exit(evsel);
1135 free(evsel);
1136 }
1137
1138 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1139 struct perf_counts_values *count)
1140 {
1141 struct perf_counts_values tmp;
1142
1143 if (!evsel->prev_raw_counts)
1144 return;
1145
1146 if (cpu == -1) {
1147 tmp = evsel->prev_raw_counts->aggr;
1148 evsel->prev_raw_counts->aggr = *count;
1149 } else {
1150 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1151 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1152 }
1153
1154 count->val = count->val - tmp.val;
1155 count->ena = count->ena - tmp.ena;
1156 count->run = count->run - tmp.run;
1157 }
1158
1159 void perf_counts_values__scale(struct perf_counts_values *count,
1160 bool scale, s8 *pscaled)
1161 {
1162 s8 scaled = 0;
1163
1164 if (scale) {
1165 if (count->run == 0) {
1166 scaled = -1;
1167 count->val = 0;
1168 } else if (count->run < count->ena) {
1169 scaled = 1;
1170 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1171 }
1172 } else
1173 count->ena = count->run = 0;
1174
1175 if (pscaled)
1176 *pscaled = scaled;
1177 }
1178
1179 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1180 struct perf_counts_values *count)
1181 {
1182 memset(count, 0, sizeof(*count));
1183
1184 if (FD(evsel, cpu, thread) < 0)
1185 return -EINVAL;
1186
1187 if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
1188 return -errno;
1189
1190 return 0;
1191 }
1192
1193 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1194 int cpu, int thread, bool scale)
1195 {
1196 struct perf_counts_values count;
1197 size_t nv = scale ? 3 : 1;
1198
1199 if (FD(evsel, cpu, thread) < 0)
1200 return -EINVAL;
1201
1202 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1203 return -ENOMEM;
1204
1205 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
1206 return -errno;
1207
1208 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1209 perf_counts_values__scale(&count, scale, NULL);
1210 *perf_counts(evsel->counts, cpu, thread) = count;
1211 return 0;
1212 }
1213
1214 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1215 {
1216 struct perf_evsel *leader = evsel->leader;
1217 int fd;
1218
1219 if (perf_evsel__is_group_leader(evsel))
1220 return -1;
1221
1222 /*
1223 * Leader must be already processed/open,
1224 * if not it's a bug.
1225 */
1226 BUG_ON(!leader->fd);
1227
1228 fd = FD(leader, cpu, thread);
1229 BUG_ON(fd == -1);
1230
1231 return fd;
1232 }
1233
1234 struct bit_names {
1235 int bit;
1236 const char *name;
1237 };
1238
1239 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1240 {
1241 bool first_bit = true;
1242 int i = 0;
1243
1244 do {
1245 if (value & bits[i].bit) {
1246 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1247 first_bit = false;
1248 }
1249 } while (bits[++i].name != NULL);
1250 }
1251
1252 static void __p_sample_type(char *buf, size_t size, u64 value)
1253 {
1254 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1255 struct bit_names bits[] = {
1256 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1257 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1258 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1259 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1260 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1261 bit_name(WEIGHT),
1262 { .name = NULL, }
1263 };
1264 #undef bit_name
1265 __p_bits(buf, size, value, bits);
1266 }
1267
1268 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1269 {
1270 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1271 struct bit_names bits[] = {
1272 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1273 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1274 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1275 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1276 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1277 { .name = NULL, }
1278 };
1279 #undef bit_name
1280 __p_bits(buf, size, value, bits);
1281 }
1282
1283 static void __p_read_format(char *buf, size_t size, u64 value)
1284 {
1285 #define bit_name(n) { PERF_FORMAT_##n, #n }
1286 struct bit_names bits[] = {
1287 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1288 bit_name(ID), bit_name(GROUP),
1289 { .name = NULL, }
1290 };
1291 #undef bit_name
1292 __p_bits(buf, size, value, bits);
1293 }
1294
1295 #define BUF_SIZE 1024
1296
1297 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1298 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1299 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1300 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1301 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1302 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1303
1304 #define PRINT_ATTRn(_n, _f, _p) \
1305 do { \
1306 if (attr->_f) { \
1307 _p(attr->_f); \
1308 ret += attr__fprintf(fp, _n, buf, priv);\
1309 } \
1310 } while (0)
1311
1312 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1313
1314 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1315 attr__fprintf_f attr__fprintf, void *priv)
1316 {
1317 char buf[BUF_SIZE];
1318 int ret = 0;
1319
1320 PRINT_ATTRf(type, p_unsigned);
1321 PRINT_ATTRf(size, p_unsigned);
1322 PRINT_ATTRf(config, p_hex);
1323 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1324 PRINT_ATTRf(sample_type, p_sample_type);
1325 PRINT_ATTRf(read_format, p_read_format);
1326
1327 PRINT_ATTRf(disabled, p_unsigned);
1328 PRINT_ATTRf(inherit, p_unsigned);
1329 PRINT_ATTRf(pinned, p_unsigned);
1330 PRINT_ATTRf(exclusive, p_unsigned);
1331 PRINT_ATTRf(exclude_user, p_unsigned);
1332 PRINT_ATTRf(exclude_kernel, p_unsigned);
1333 PRINT_ATTRf(exclude_hv, p_unsigned);
1334 PRINT_ATTRf(exclude_idle, p_unsigned);
1335 PRINT_ATTRf(mmap, p_unsigned);
1336 PRINT_ATTRf(comm, p_unsigned);
1337 PRINT_ATTRf(freq, p_unsigned);
1338 PRINT_ATTRf(inherit_stat, p_unsigned);
1339 PRINT_ATTRf(enable_on_exec, p_unsigned);
1340 PRINT_ATTRf(task, p_unsigned);
1341 PRINT_ATTRf(watermark, p_unsigned);
1342 PRINT_ATTRf(precise_ip, p_unsigned);
1343 PRINT_ATTRf(mmap_data, p_unsigned);
1344 PRINT_ATTRf(sample_id_all, p_unsigned);
1345 PRINT_ATTRf(exclude_host, p_unsigned);
1346 PRINT_ATTRf(exclude_guest, p_unsigned);
1347 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1348 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1349 PRINT_ATTRf(mmap2, p_unsigned);
1350 PRINT_ATTRf(comm_exec, p_unsigned);
1351 PRINT_ATTRf(use_clockid, p_unsigned);
1352 PRINT_ATTRf(context_switch, p_unsigned);
1353 PRINT_ATTRf(write_backward, p_unsigned);
1354
1355 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1356 PRINT_ATTRf(bp_type, p_unsigned);
1357 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1358 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1359 PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1360 PRINT_ATTRf(sample_regs_user, p_hex);
1361 PRINT_ATTRf(sample_stack_user, p_unsigned);
1362 PRINT_ATTRf(clockid, p_signed);
1363 PRINT_ATTRf(sample_regs_intr, p_hex);
1364 PRINT_ATTRf(aux_watermark, p_unsigned);
1365 PRINT_ATTRf(sample_max_stack, p_unsigned);
1366
1367 return ret;
1368 }
1369
1370 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1371 void *priv __attribute__((unused)))
1372 {
1373 return fprintf(fp, " %-32s %s\n", name, val);
1374 }
1375
1376 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1377 struct thread_map *threads)
1378 {
1379 int cpu, thread, nthreads;
1380 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1381 int pid = -1, err;
1382 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1383
1384 if (perf_missing_features.write_backward && evsel->attr.write_backward)
1385 return -EINVAL;
1386
1387 if (evsel->system_wide)
1388 nthreads = 1;
1389 else
1390 nthreads = threads->nr;
1391
1392 if (evsel->fd == NULL &&
1393 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1394 return -ENOMEM;
1395
1396 if (evsel->cgrp) {
1397 flags |= PERF_FLAG_PID_CGROUP;
1398 pid = evsel->cgrp->fd;
1399 }
1400
1401 fallback_missing_features:
1402 if (perf_missing_features.clockid_wrong)
1403 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1404 if (perf_missing_features.clockid) {
1405 evsel->attr.use_clockid = 0;
1406 evsel->attr.clockid = 0;
1407 }
1408 if (perf_missing_features.cloexec)
1409 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1410 if (perf_missing_features.mmap2)
1411 evsel->attr.mmap2 = 0;
1412 if (perf_missing_features.exclude_guest)
1413 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1414 if (perf_missing_features.lbr_flags)
1415 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1416 PERF_SAMPLE_BRANCH_NO_CYCLES);
1417 retry_sample_id:
1418 if (perf_missing_features.sample_id_all)
1419 evsel->attr.sample_id_all = 0;
1420
1421 if (verbose >= 2) {
1422 fprintf(stderr, "%.60s\n", graph_dotted_line);
1423 fprintf(stderr, "perf_event_attr:\n");
1424 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1425 fprintf(stderr, "%.60s\n", graph_dotted_line);
1426 }
1427
1428 for (cpu = 0; cpu < cpus->nr; cpu++) {
1429
1430 for (thread = 0; thread < nthreads; thread++) {
1431 int group_fd;
1432
1433 if (!evsel->cgrp && !evsel->system_wide)
1434 pid = thread_map__pid(threads, thread);
1435
1436 group_fd = get_group_fd(evsel, cpu, thread);
1437 retry_open:
1438 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1439 pid, cpus->map[cpu], group_fd, flags);
1440
1441 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
1442 pid,
1443 cpus->map[cpu],
1444 group_fd, flags);
1445 if (FD(evsel, cpu, thread) < 0) {
1446 err = -errno;
1447 pr_debug2("sys_perf_event_open failed, error %d\n",
1448 err);
1449 goto try_fallback;
1450 }
1451
1452 if (evsel->bpf_fd >= 0) {
1453 int evt_fd = FD(evsel, cpu, thread);
1454 int bpf_fd = evsel->bpf_fd;
1455
1456 err = ioctl(evt_fd,
1457 PERF_EVENT_IOC_SET_BPF,
1458 bpf_fd);
1459 if (err && errno != EEXIST) {
1460 pr_err("failed to attach bpf fd %d: %s\n",
1461 bpf_fd, strerror(errno));
1462 err = -EINVAL;
1463 goto out_close;
1464 }
1465 }
1466
1467 set_rlimit = NO_CHANGE;
1468
1469 /*
1470 * If we succeeded but had to kill clockid, fail and
1471 * have perf_evsel__open_strerror() print us a nice
1472 * error.
1473 */
1474 if (perf_missing_features.clockid ||
1475 perf_missing_features.clockid_wrong) {
1476 err = -EINVAL;
1477 goto out_close;
1478 }
1479 }
1480 }
1481
1482 return 0;
1483
1484 try_fallback:
1485 /*
1486 * perf stat needs between 5 and 22 fds per CPU. When we run out
1487 * of them try to increase the limits.
1488 */
1489 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1490 struct rlimit l;
1491 int old_errno = errno;
1492
1493 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1494 if (set_rlimit == NO_CHANGE)
1495 l.rlim_cur = l.rlim_max;
1496 else {
1497 l.rlim_cur = l.rlim_max + 1000;
1498 l.rlim_max = l.rlim_cur;
1499 }
1500 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1501 set_rlimit++;
1502 errno = old_errno;
1503 goto retry_open;
1504 }
1505 }
1506 errno = old_errno;
1507 }
1508
1509 if (err != -EINVAL || cpu > 0 || thread > 0)
1510 goto out_close;
1511
1512 /*
1513 * Must probe features in the order they were added to the
1514 * perf_event_attr interface.
1515 */
1516 if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1517 perf_missing_features.write_backward = true;
1518 goto out_close;
1519 } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1520 perf_missing_features.clockid_wrong = true;
1521 goto fallback_missing_features;
1522 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1523 perf_missing_features.clockid = true;
1524 goto fallback_missing_features;
1525 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1526 perf_missing_features.cloexec = true;
1527 goto fallback_missing_features;
1528 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1529 perf_missing_features.mmap2 = true;
1530 goto fallback_missing_features;
1531 } else if (!perf_missing_features.exclude_guest &&
1532 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1533 perf_missing_features.exclude_guest = true;
1534 goto fallback_missing_features;
1535 } else if (!perf_missing_features.sample_id_all) {
1536 perf_missing_features.sample_id_all = true;
1537 goto retry_sample_id;
1538 } else if (!perf_missing_features.lbr_flags &&
1539 (evsel->attr.branch_sample_type &
1540 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1541 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1542 perf_missing_features.lbr_flags = true;
1543 goto fallback_missing_features;
1544 }
1545 out_close:
1546 do {
1547 while (--thread >= 0) {
1548 close(FD(evsel, cpu, thread));
1549 FD(evsel, cpu, thread) = -1;
1550 }
1551 thread = nthreads;
1552 } while (--cpu >= 0);
1553 return err;
1554 }
1555
1556 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1557 {
1558 if (evsel->fd == NULL)
1559 return;
1560
1561 perf_evsel__close_fd(evsel, ncpus, nthreads);
1562 perf_evsel__free_fd(evsel);
1563 }
1564
1565 static struct {
1566 struct cpu_map map;
1567 int cpus[1];
1568 } empty_cpu_map = {
1569 .map.nr = 1,
1570 .cpus = { -1, },
1571 };
1572
1573 static struct {
1574 struct thread_map map;
1575 int threads[1];
1576 } empty_thread_map = {
1577 .map.nr = 1,
1578 .threads = { -1, },
1579 };
1580
1581 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1582 struct thread_map *threads)
1583 {
1584 if (cpus == NULL) {
1585 /* Work around old compiler warnings about strict aliasing */
1586 cpus = &empty_cpu_map.map;
1587 }
1588
1589 if (threads == NULL)
1590 threads = &empty_thread_map.map;
1591
1592 return __perf_evsel__open(evsel, cpus, threads);
1593 }
1594
1595 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1596 struct cpu_map *cpus)
1597 {
1598 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
1599 }
1600
1601 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1602 struct thread_map *threads)
1603 {
1604 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
1605 }
1606
1607 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1608 const union perf_event *event,
1609 struct perf_sample *sample)
1610 {
1611 u64 type = evsel->attr.sample_type;
1612 const u64 *array = event->sample.array;
1613 bool swapped = evsel->needs_swap;
1614 union u64_swap u;
1615
1616 array += ((event->header.size -
1617 sizeof(event->header)) / sizeof(u64)) - 1;
1618
1619 if (type & PERF_SAMPLE_IDENTIFIER) {
1620 sample->id = *array;
1621 array--;
1622 }
1623
1624 if (type & PERF_SAMPLE_CPU) {
1625 u.val64 = *array;
1626 if (swapped) {
1627 /* undo swap of u64, then swap on individual u32s */
1628 u.val64 = bswap_64(u.val64);
1629 u.val32[0] = bswap_32(u.val32[0]);
1630 }
1631
1632 sample->cpu = u.val32[0];
1633 array--;
1634 }
1635
1636 if (type & PERF_SAMPLE_STREAM_ID) {
1637 sample->stream_id = *array;
1638 array--;
1639 }
1640
1641 if (type & PERF_SAMPLE_ID) {
1642 sample->id = *array;
1643 array--;
1644 }
1645
1646 if (type & PERF_SAMPLE_TIME) {
1647 sample->time = *array;
1648 array--;
1649 }
1650
1651 if (type & PERF_SAMPLE_TID) {
1652 u.val64 = *array;
1653 if (swapped) {
1654 /* undo swap of u64, then swap on individual u32s */
1655 u.val64 = bswap_64(u.val64);
1656 u.val32[0] = bswap_32(u.val32[0]);
1657 u.val32[1] = bswap_32(u.val32[1]);
1658 }
1659
1660 sample->pid = u.val32[0];
1661 sample->tid = u.val32[1];
1662 array--;
1663 }
1664
1665 return 0;
1666 }
1667
1668 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1669 u64 size)
1670 {
1671 return size > max_size || offset + size > endp;
1672 }
1673
1674 #define OVERFLOW_CHECK(offset, size, max_size) \
1675 do { \
1676 if (overflow(endp, (max_size), (offset), (size))) \
1677 return -EFAULT; \
1678 } while (0)
1679
1680 #define OVERFLOW_CHECK_u64(offset) \
1681 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1682
1683 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1684 struct perf_sample *data)
1685 {
1686 u64 type = evsel->attr.sample_type;
1687 bool swapped = evsel->needs_swap;
1688 const u64 *array;
1689 u16 max_size = event->header.size;
1690 const void *endp = (void *)event + max_size;
1691 u64 sz;
1692
1693 /*
1694 * used for cross-endian analysis. See git commit 65014ab3
1695 * for why this goofiness is needed.
1696 */
1697 union u64_swap u;
1698
1699 memset(data, 0, sizeof(*data));
1700 data->cpu = data->pid = data->tid = -1;
1701 data->stream_id = data->id = data->time = -1ULL;
1702 data->period = evsel->attr.sample_period;
1703 data->weight = 0;
1704 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1705
1706 if (event->header.type != PERF_RECORD_SAMPLE) {
1707 if (!evsel->attr.sample_id_all)
1708 return 0;
1709 return perf_evsel__parse_id_sample(evsel, event, data);
1710 }
1711
1712 array = event->sample.array;
1713
1714 /*
1715 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1716 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1717 * check the format does not go past the end of the event.
1718 */
1719 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1720 return -EFAULT;
1721
1722 data->id = -1ULL;
1723 if (type & PERF_SAMPLE_IDENTIFIER) {
1724 data->id = *array;
1725 array++;
1726 }
1727
1728 if (type & PERF_SAMPLE_IP) {
1729 data->ip = *array;
1730 array++;
1731 }
1732
1733 if (type & PERF_SAMPLE_TID) {
1734 u.val64 = *array;
1735 if (swapped) {
1736 /* undo swap of u64, then swap on individual u32s */
1737 u.val64 = bswap_64(u.val64);
1738 u.val32[0] = bswap_32(u.val32[0]);
1739 u.val32[1] = bswap_32(u.val32[1]);
1740 }
1741
1742 data->pid = u.val32[0];
1743 data->tid = u.val32[1];
1744 array++;
1745 }
1746
1747 if (type & PERF_SAMPLE_TIME) {
1748 data->time = *array;
1749 array++;
1750 }
1751
1752 data->addr = 0;
1753 if (type & PERF_SAMPLE_ADDR) {
1754 data->addr = *array;
1755 array++;
1756 }
1757
1758 if (type & PERF_SAMPLE_ID) {
1759 data->id = *array;
1760 array++;
1761 }
1762
1763 if (type & PERF_SAMPLE_STREAM_ID) {
1764 data->stream_id = *array;
1765 array++;
1766 }
1767
1768 if (type & PERF_SAMPLE_CPU) {
1769
1770 u.val64 = *array;
1771 if (swapped) {
1772 /* undo swap of u64, then swap on individual u32s */
1773 u.val64 = bswap_64(u.val64);
1774 u.val32[0] = bswap_32(u.val32[0]);
1775 }
1776
1777 data->cpu = u.val32[0];
1778 array++;
1779 }
1780
1781 if (type & PERF_SAMPLE_PERIOD) {
1782 data->period = *array;
1783 array++;
1784 }
1785
1786 if (type & PERF_SAMPLE_READ) {
1787 u64 read_format = evsel->attr.read_format;
1788
1789 OVERFLOW_CHECK_u64(array);
1790 if (read_format & PERF_FORMAT_GROUP)
1791 data->read.group.nr = *array;
1792 else
1793 data->read.one.value = *array;
1794
1795 array++;
1796
1797 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1798 OVERFLOW_CHECK_u64(array);
1799 data->read.time_enabled = *array;
1800 array++;
1801 }
1802
1803 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1804 OVERFLOW_CHECK_u64(array);
1805 data->read.time_running = *array;
1806 array++;
1807 }
1808
1809 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1810 if (read_format & PERF_FORMAT_GROUP) {
1811 const u64 max_group_nr = UINT64_MAX /
1812 sizeof(struct sample_read_value);
1813
1814 if (data->read.group.nr > max_group_nr)
1815 return -EFAULT;
1816 sz = data->read.group.nr *
1817 sizeof(struct sample_read_value);
1818 OVERFLOW_CHECK(array, sz, max_size);
1819 data->read.group.values =
1820 (struct sample_read_value *)array;
1821 array = (void *)array + sz;
1822 } else {
1823 OVERFLOW_CHECK_u64(array);
1824 data->read.one.id = *array;
1825 array++;
1826 }
1827 }
1828
1829 if (type & PERF_SAMPLE_CALLCHAIN) {
1830 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
1831
1832 OVERFLOW_CHECK_u64(array);
1833 data->callchain = (struct ip_callchain *)array++;
1834 if (data->callchain->nr > max_callchain_nr)
1835 return -EFAULT;
1836 sz = data->callchain->nr * sizeof(u64);
1837 OVERFLOW_CHECK(array, sz, max_size);
1838 array = (void *)array + sz;
1839 }
1840
1841 if (type & PERF_SAMPLE_RAW) {
1842 OVERFLOW_CHECK_u64(array);
1843 u.val64 = *array;
1844 if (WARN_ONCE(swapped,
1845 "Endianness of raw data not corrected!\n")) {
1846 /* undo swap of u64, then swap on individual u32s */
1847 u.val64 = bswap_64(u.val64);
1848 u.val32[0] = bswap_32(u.val32[0]);
1849 u.val32[1] = bswap_32(u.val32[1]);
1850 }
1851 data->raw_size = u.val32[0];
1852 array = (void *)array + sizeof(u32);
1853
1854 OVERFLOW_CHECK(array, data->raw_size, max_size);
1855 data->raw_data = (void *)array;
1856 array = (void *)array + data->raw_size;
1857 }
1858
1859 if (type & PERF_SAMPLE_BRANCH_STACK) {
1860 const u64 max_branch_nr = UINT64_MAX /
1861 sizeof(struct branch_entry);
1862
1863 OVERFLOW_CHECK_u64(array);
1864 data->branch_stack = (struct branch_stack *)array++;
1865
1866 if (data->branch_stack->nr > max_branch_nr)
1867 return -EFAULT;
1868 sz = data->branch_stack->nr * sizeof(struct branch_entry);
1869 OVERFLOW_CHECK(array, sz, max_size);
1870 array = (void *)array + sz;
1871 }
1872
1873 if (type & PERF_SAMPLE_REGS_USER) {
1874 OVERFLOW_CHECK_u64(array);
1875 data->user_regs.abi = *array;
1876 array++;
1877
1878 if (data->user_regs.abi) {
1879 u64 mask = evsel->attr.sample_regs_user;
1880
1881 sz = hweight_long(mask) * sizeof(u64);
1882 OVERFLOW_CHECK(array, sz, max_size);
1883 data->user_regs.mask = mask;
1884 data->user_regs.regs = (u64 *)array;
1885 array = (void *)array + sz;
1886 }
1887 }
1888
1889 if (type & PERF_SAMPLE_STACK_USER) {
1890 OVERFLOW_CHECK_u64(array);
1891 sz = *array++;
1892
1893 data->user_stack.offset = ((char *)(array - 1)
1894 - (char *) event);
1895
1896 if (!sz) {
1897 data->user_stack.size = 0;
1898 } else {
1899 OVERFLOW_CHECK(array, sz, max_size);
1900 data->user_stack.data = (char *)array;
1901 array = (void *)array + sz;
1902 OVERFLOW_CHECK_u64(array);
1903 data->user_stack.size = *array++;
1904 if (WARN_ONCE(data->user_stack.size > sz,
1905 "user stack dump failure\n"))
1906 return -EFAULT;
1907 }
1908 }
1909
1910 data->weight = 0;
1911 if (type & PERF_SAMPLE_WEIGHT) {
1912 OVERFLOW_CHECK_u64(array);
1913 data->weight = *array;
1914 array++;
1915 }
1916
1917 data->data_src = PERF_MEM_DATA_SRC_NONE;
1918 if (type & PERF_SAMPLE_DATA_SRC) {
1919 OVERFLOW_CHECK_u64(array);
1920 data->data_src = *array;
1921 array++;
1922 }
1923
1924 data->transaction = 0;
1925 if (type & PERF_SAMPLE_TRANSACTION) {
1926 OVERFLOW_CHECK_u64(array);
1927 data->transaction = *array;
1928 array++;
1929 }
1930
1931 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1932 if (type & PERF_SAMPLE_REGS_INTR) {
1933 OVERFLOW_CHECK_u64(array);
1934 data->intr_regs.abi = *array;
1935 array++;
1936
1937 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1938 u64 mask = evsel->attr.sample_regs_intr;
1939
1940 sz = hweight_long(mask) * sizeof(u64);
1941 OVERFLOW_CHECK(array, sz, max_size);
1942 data->intr_regs.mask = mask;
1943 data->intr_regs.regs = (u64 *)array;
1944 array = (void *)array + sz;
1945 }
1946 }
1947
1948 return 0;
1949 }
1950
1951 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
1952 u64 read_format)
1953 {
1954 size_t sz, result = sizeof(struct sample_event);
1955
1956 if (type & PERF_SAMPLE_IDENTIFIER)
1957 result += sizeof(u64);
1958
1959 if (type & PERF_SAMPLE_IP)
1960 result += sizeof(u64);
1961
1962 if (type & PERF_SAMPLE_TID)
1963 result += sizeof(u64);
1964
1965 if (type & PERF_SAMPLE_TIME)
1966 result += sizeof(u64);
1967
1968 if (type & PERF_SAMPLE_ADDR)
1969 result += sizeof(u64);
1970
1971 if (type & PERF_SAMPLE_ID)
1972 result += sizeof(u64);
1973
1974 if (type & PERF_SAMPLE_STREAM_ID)
1975 result += sizeof(u64);
1976
1977 if (type & PERF_SAMPLE_CPU)
1978 result += sizeof(u64);
1979
1980 if (type & PERF_SAMPLE_PERIOD)
1981 result += sizeof(u64);
1982
1983 if (type & PERF_SAMPLE_READ) {
1984 result += sizeof(u64);
1985 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1986 result += sizeof(u64);
1987 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1988 result += sizeof(u64);
1989 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1990 if (read_format & PERF_FORMAT_GROUP) {
1991 sz = sample->read.group.nr *
1992 sizeof(struct sample_read_value);
1993 result += sz;
1994 } else {
1995 result += sizeof(u64);
1996 }
1997 }
1998
1999 if (type & PERF_SAMPLE_CALLCHAIN) {
2000 sz = (sample->callchain->nr + 1) * sizeof(u64);
2001 result += sz;
2002 }
2003
2004 if (type & PERF_SAMPLE_RAW) {
2005 result += sizeof(u32);
2006 result += sample->raw_size;
2007 }
2008
2009 if (type & PERF_SAMPLE_BRANCH_STACK) {
2010 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2011 sz += sizeof(u64);
2012 result += sz;
2013 }
2014
2015 if (type & PERF_SAMPLE_REGS_USER) {
2016 if (sample->user_regs.abi) {
2017 result += sizeof(u64);
2018 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2019 result += sz;
2020 } else {
2021 result += sizeof(u64);
2022 }
2023 }
2024
2025 if (type & PERF_SAMPLE_STACK_USER) {
2026 sz = sample->user_stack.size;
2027 result += sizeof(u64);
2028 if (sz) {
2029 result += sz;
2030 result += sizeof(u64);
2031 }
2032 }
2033
2034 if (type & PERF_SAMPLE_WEIGHT)
2035 result += sizeof(u64);
2036
2037 if (type & PERF_SAMPLE_DATA_SRC)
2038 result += sizeof(u64);
2039
2040 if (type & PERF_SAMPLE_TRANSACTION)
2041 result += sizeof(u64);
2042
2043 if (type & PERF_SAMPLE_REGS_INTR) {
2044 if (sample->intr_regs.abi) {
2045 result += sizeof(u64);
2046 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2047 result += sz;
2048 } else {
2049 result += sizeof(u64);
2050 }
2051 }
2052
2053 return result;
2054 }
2055
2056 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2057 u64 read_format,
2058 const struct perf_sample *sample,
2059 bool swapped)
2060 {
2061 u64 *array;
2062 size_t sz;
2063 /*
2064 * used for cross-endian analysis. See git commit 65014ab3
2065 * for why this goofiness is needed.
2066 */
2067 union u64_swap u;
2068
2069 array = event->sample.array;
2070
2071 if (type & PERF_SAMPLE_IDENTIFIER) {
2072 *array = sample->id;
2073 array++;
2074 }
2075
2076 if (type & PERF_SAMPLE_IP) {
2077 *array = sample->ip;
2078 array++;
2079 }
2080
2081 if (type & PERF_SAMPLE_TID) {
2082 u.val32[0] = sample->pid;
2083 u.val32[1] = sample->tid;
2084 if (swapped) {
2085 /*
2086 * Inverse of what is done in perf_evsel__parse_sample
2087 */
2088 u.val32[0] = bswap_32(u.val32[0]);
2089 u.val32[1] = bswap_32(u.val32[1]);
2090 u.val64 = bswap_64(u.val64);
2091 }
2092
2093 *array = u.val64;
2094 array++;
2095 }
2096
2097 if (type & PERF_SAMPLE_TIME) {
2098 *array = sample->time;
2099 array++;
2100 }
2101
2102 if (type & PERF_SAMPLE_ADDR) {
2103 *array = sample->addr;
2104 array++;
2105 }
2106
2107 if (type & PERF_SAMPLE_ID) {
2108 *array = sample->id;
2109 array++;
2110 }
2111
2112 if (type & PERF_SAMPLE_STREAM_ID) {
2113 *array = sample->stream_id;
2114 array++;
2115 }
2116
2117 if (type & PERF_SAMPLE_CPU) {
2118 u.val32[0] = sample->cpu;
2119 if (swapped) {
2120 /*
2121 * Inverse of what is done in perf_evsel__parse_sample
2122 */
2123 u.val32[0] = bswap_32(u.val32[0]);
2124 u.val64 = bswap_64(u.val64);
2125 }
2126 *array = u.val64;
2127 array++;
2128 }
2129
2130 if (type & PERF_SAMPLE_PERIOD) {
2131 *array = sample->period;
2132 array++;
2133 }
2134
2135 if (type & PERF_SAMPLE_READ) {
2136 if (read_format & PERF_FORMAT_GROUP)
2137 *array = sample->read.group.nr;
2138 else
2139 *array = sample->read.one.value;
2140 array++;
2141
2142 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2143 *array = sample->read.time_enabled;
2144 array++;
2145 }
2146
2147 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2148 *array = sample->read.time_running;
2149 array++;
2150 }
2151
2152 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2153 if (read_format & PERF_FORMAT_GROUP) {
2154 sz = sample->read.group.nr *
2155 sizeof(struct sample_read_value);
2156 memcpy(array, sample->read.group.values, sz);
2157 array = (void *)array + sz;
2158 } else {
2159 *array = sample->read.one.id;
2160 array++;
2161 }
2162 }
2163
2164 if (type & PERF_SAMPLE_CALLCHAIN) {
2165 sz = (sample->callchain->nr + 1) * sizeof(u64);
2166 memcpy(array, sample->callchain, sz);
2167 array = (void *)array + sz;
2168 }
2169
2170 if (type & PERF_SAMPLE_RAW) {
2171 u.val32[0] = sample->raw_size;
2172 if (WARN_ONCE(swapped,
2173 "Endianness of raw data not corrected!\n")) {
2174 /*
2175 * Inverse of what is done in perf_evsel__parse_sample
2176 */
2177 u.val32[0] = bswap_32(u.val32[0]);
2178 u.val32[1] = bswap_32(u.val32[1]);
2179 u.val64 = bswap_64(u.val64);
2180 }
2181 *array = u.val64;
2182 array = (void *)array + sizeof(u32);
2183
2184 memcpy(array, sample->raw_data, sample->raw_size);
2185 array = (void *)array + sample->raw_size;
2186 }
2187
2188 if (type & PERF_SAMPLE_BRANCH_STACK) {
2189 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2190 sz += sizeof(u64);
2191 memcpy(array, sample->branch_stack, sz);
2192 array = (void *)array + sz;
2193 }
2194
2195 if (type & PERF_SAMPLE_REGS_USER) {
2196 if (sample->user_regs.abi) {
2197 *array++ = sample->user_regs.abi;
2198 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2199 memcpy(array, sample->user_regs.regs, sz);
2200 array = (void *)array + sz;
2201 } else {
2202 *array++ = 0;
2203 }
2204 }
2205
2206 if (type & PERF_SAMPLE_STACK_USER) {
2207 sz = sample->user_stack.size;
2208 *array++ = sz;
2209 if (sz) {
2210 memcpy(array, sample->user_stack.data, sz);
2211 array = (void *)array + sz;
2212 *array++ = sz;
2213 }
2214 }
2215
2216 if (type & PERF_SAMPLE_WEIGHT) {
2217 *array = sample->weight;
2218 array++;
2219 }
2220
2221 if (type & PERF_SAMPLE_DATA_SRC) {
2222 *array = sample->data_src;
2223 array++;
2224 }
2225
2226 if (type & PERF_SAMPLE_TRANSACTION) {
2227 *array = sample->transaction;
2228 array++;
2229 }
2230
2231 if (type & PERF_SAMPLE_REGS_INTR) {
2232 if (sample->intr_regs.abi) {
2233 *array++ = sample->intr_regs.abi;
2234 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2235 memcpy(array, sample->intr_regs.regs, sz);
2236 array = (void *)array + sz;
2237 } else {
2238 *array++ = 0;
2239 }
2240 }
2241
2242 return 0;
2243 }
2244
2245 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2246 {
2247 return pevent_find_field(evsel->tp_format, name);
2248 }
2249
2250 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2251 const char *name)
2252 {
2253 struct format_field *field = perf_evsel__field(evsel, name);
2254 int offset;
2255
2256 if (!field)
2257 return NULL;
2258
2259 offset = field->offset;
2260
2261 if (field->flags & FIELD_IS_DYNAMIC) {
2262 offset = *(int *)(sample->raw_data + field->offset);
2263 offset &= 0xffff;
2264 }
2265
2266 return sample->raw_data + offset;
2267 }
2268
2269 u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
2270 bool needs_swap)
2271 {
2272 u64 value;
2273 void *ptr = sample->raw_data + field->offset;
2274
2275 switch (field->size) {
2276 case 1:
2277 return *(u8 *)ptr;
2278 case 2:
2279 value = *(u16 *)ptr;
2280 break;
2281 case 4:
2282 value = *(u32 *)ptr;
2283 break;
2284 case 8:
2285 memcpy(&value, ptr, sizeof(u64));
2286 break;
2287 default:
2288 return 0;
2289 }
2290
2291 if (!needs_swap)
2292 return value;
2293
2294 switch (field->size) {
2295 case 2:
2296 return bswap_16(value);
2297 case 4:
2298 return bswap_32(value);
2299 case 8:
2300 return bswap_64(value);
2301 default:
2302 return 0;
2303 }
2304
2305 return 0;
2306 }
2307
2308 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2309 const char *name)
2310 {
2311 struct format_field *field = perf_evsel__field(evsel, name);
2312
2313 if (!field)
2314 return 0;
2315
2316 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2317 }
2318
2319 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2320 char *msg, size_t msgsize)
2321 {
2322 int paranoid;
2323
2324 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2325 evsel->attr.type == PERF_TYPE_HARDWARE &&
2326 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2327 /*
2328 * If it's cycles then fall back to hrtimer based
2329 * cpu-clock-tick sw counter, which is always available even if
2330 * no PMU support.
2331 *
2332 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2333 * b0a873e).
2334 */
2335 scnprintf(msg, msgsize, "%s",
2336 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2337
2338 evsel->attr.type = PERF_TYPE_SOFTWARE;
2339 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2340
2341 zfree(&evsel->name);
2342 return true;
2343 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2344 (paranoid = perf_event_paranoid()) > 1) {
2345 const char *name = perf_evsel__name(evsel);
2346 char *new_name;
2347
2348 if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
2349 return false;
2350
2351 if (evsel->name)
2352 free(evsel->name);
2353 evsel->name = new_name;
2354 scnprintf(msg, msgsize,
2355 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2356 evsel->attr.exclude_kernel = 1;
2357
2358 return true;
2359 }
2360
2361 return false;
2362 }
2363
2364 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2365 int err, char *msg, size_t size)
2366 {
2367 char sbuf[STRERR_BUFSIZE];
2368
2369 switch (err) {
2370 case EPERM:
2371 case EACCES:
2372 return scnprintf(msg, size,
2373 "You may not have permission to collect %sstats.\n\n"
2374 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2375 "which controls use of the performance events system by\n"
2376 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2377 "The current value is %d:\n\n"
2378 " -1: Allow use of (almost) all events by all users\n"
2379 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
2380 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2381 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
2382 target->system_wide ? "system-wide " : "",
2383 perf_event_paranoid());
2384 case ENOENT:
2385 return scnprintf(msg, size, "The %s event is not supported.",
2386 perf_evsel__name(evsel));
2387 case EMFILE:
2388 return scnprintf(msg, size, "%s",
2389 "Too many events are opened.\n"
2390 "Probably the maximum number of open file descriptors has been reached.\n"
2391 "Hint: Try again after reducing the number of events.\n"
2392 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2393 case ENOMEM:
2394 if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
2395 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2396 return scnprintf(msg, size,
2397 "Not enough memory to setup event with callchain.\n"
2398 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2399 "Hint: Current value: %d", sysctl_perf_event_max_stack);
2400 break;
2401 case ENODEV:
2402 if (target->cpu_list)
2403 return scnprintf(msg, size, "%s",
2404 "No such device - did you specify an out-of-range profile CPU?");
2405 break;
2406 case EOPNOTSUPP:
2407 if (evsel->attr.sample_period != 0)
2408 return scnprintf(msg, size, "%s",
2409 "PMU Hardware doesn't support sampling/overflow-interrupts.");
2410 if (evsel->attr.precise_ip)
2411 return scnprintf(msg, size, "%s",
2412 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2413 #if defined(__i386__) || defined(__x86_64__)
2414 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2415 return scnprintf(msg, size, "%s",
2416 "No hardware sampling interrupt available.\n"
2417 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2418 #endif
2419 break;
2420 case EBUSY:
2421 if (find_process("oprofiled"))
2422 return scnprintf(msg, size,
2423 "The PMU counters are busy/taken by another profiler.\n"
2424 "We found oprofile daemon running, please stop it and try again.");
2425 break;
2426 case EINVAL:
2427 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2428 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2429 if (perf_missing_features.clockid)
2430 return scnprintf(msg, size, "clockid feature not supported.");
2431 if (perf_missing_features.clockid_wrong)
2432 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2433 break;
2434 default:
2435 break;
2436 }
2437
2438 return scnprintf(msg, size,
2439 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2440 "/bin/dmesg may provide additional information.\n"
2441 "No CONFIG_PERF_EVENTS=y kernel support configured?",
2442 err, str_error_r(err, sbuf, sizeof(sbuf)),
2443 perf_evsel__name(evsel));
2444 }
2445
2446 char *perf_evsel__env_arch(struct perf_evsel *evsel)
2447 {
2448 if (evsel && evsel->evlist && evsel->evlist->env)
2449 return evsel->evlist->env->arch;
2450 return NULL;
2451 }
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